Top down construction by Sai Towers P Ltd.
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Sai Towers pvt. ltd. working in field of road construction , building construction, road development, repair and maintenance, house keeping etc.
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Top Down Construction Presentation.
The document discusses top-down construction, which is required when:
1) The distance between existing buildings and the new building line is small, requiring deep excavation and risking soil collapse.
2) It allows for more building and basement area, suitable for two or more basements.
3) The first basement slab acts as a strut, preventing soil collapse behind retaining walls.
The methodology involves:
1) Casting piles with dowels for retaining walls and slabs.
2) Excavating in stages and casting retaining wall panels with dowels between piles.
3) Pouring the first basement slab and then continuing excavation and construction from the bottom up
Top down construction presentation
Top down construction is used in congested urban areas to minimize impacts on existing structures. It involves installing deep retaining walls and excavating from the top down in stages, allowing above-ground construction to progress simultaneously. This saves significant time over traditional bottom-up methods. Diaphragm walls are installed around the perimeter and intermediate barrette piles may be used for additional support. Concrete slabs are then cast with openings to allow further staged excavation from above until the final basement level is reached. Reinforcing is installed to connect each level during construction.
Top down construction
This document summarizes a seminar on top down construction presented at Ajay Kumar Garg Engineering College. The seminar introduced top down construction as an alternative to conventional bottom-up construction for large projects with time or space constraints. It described the methodology of top down construction including installing diaphragm walls and piles, excavating below roof slabs with structural supports, and progressively excavating and constructing underground levels while building above-ground levels simultaneously. Advantages of top down construction are shortened timelines from simultaneous work, more early operational space, and suitability for tall urban buildings. Disadvantages include higher costs and requiring skilled supervision.
Deep excavation
The document summarizes different techniques for retaining deep excavations, including contiguous piles, secant piles, sheet piling, diaphragm walls, soldier piles with lagging, and presents case studies of their use. It discusses techniques such as contiguous piles with soil anchors used for the IT Tower Lahore project requiring excavation to a depth of 65 feet, and contiguous piling with 9 layers of anchors for the Alamgir Tower Lahore project requiring excavation to 85 feet. It also summarizes the use of slurry walls for the large Washington Convention Center project requiring excavation up to 55 feet deep.
Top down construction
Top-down construction method as the name implies, is a construction method, which builds the permanent structure members of the basement along with the excavation from the top to the bottom. Top-down method is mainly used for two types of urban structures, tall buildings with deep basements and underground structures such as car parks, underpasses and subway stations.
top down construction technique
top down construction definition
top down building construction
top down construction method definition
up down construction
top down bridge construction technique
bottom up construction method
top down bridge construction
environmental engineering project topics
final year project topics
environmental topics for projects
environmental engineering research topics
engineering final year project ideas
environmental engineering projects
final year computer engineering projects
final year project for electrical engineering
top down construction method definition
top down construction video
top down building construction
top down bridge construction
top down construction technique
top down construction
top down design definition
top down management definition
Deep excavations
This document provides an overview of deep excavation techniques. It discusses earth retaining walls used to restrain soil during deep excavations. Common types of retaining walls include braced walls, sheet pile walls, pile walls, diaphragm walls, and reinforced concrete walls. Supporting elements like ground anchors and struts are also discussed. Specific techniques covered include contiguous piles, secant piles, sheet piles, and the vertical soldiers and horizontal lagging method.
Construction Technology II (Seminar) - Deep excavation
The document discusses various aspects of deep excavation construction methods. It begins by listing the three main types of construction methods - open cut, bottom-up, and top-down. It then provides details on the top-down method, including a five-step sequence of construction. Next, it identifies two major design considerations for deep excavation as subsurface investigation/testing and evaluating adjacent foundation properties. It concludes by discussing different types of excavation support systems, including soldier piles and lagging, and identifying considerations for selecting support methods.
Microtunel Construction / Secant Pile
This document summarizes the process for constructing secant piles for a microtunnel shaft. It involves first constructing guide walls as reference points. Then female piles are drilled and concreted without reinforcement cages using lower grade concrete. Male piles are drilled between female piles, cutting through them. Reinforcement cages are installed in male piles before higher grade concrete is placed continuously from the bottom up via a tremie. The casing is gradually extracted to allow the concrete to rise above the cutoff level.
Recommended
Top Down Construction Presentation.
The document discusses top-down construction, which is required when:
1) The distance between existing buildings and the new building line is small, requiring deep excavation and risking soil collapse.
2) It allows for more building and basement area, suitable for two or more basements.
3) The first basement slab acts as a strut, preventing soil collapse behind retaining walls.
The methodology involves:
1) Casting piles with dowels for retaining walls and slabs.
2) Excavating in stages and casting retaining wall panels with dowels between piles.
3) Pouring the first basement slab and then continuing excavation and construction from the bottom up
Top down construction presentation
Top down construction is used in congested urban areas to minimize impacts on existing structures. It involves installing deep retaining walls and excavating from the top down in stages, allowing above-ground construction to progress simultaneously. This saves significant time over traditional bottom-up methods. Diaphragm walls are installed around the perimeter and intermediate barrette piles may be used for additional support. Concrete slabs are then cast with openings to allow further staged excavation from above until the final basement level is reached. Reinforcing is installed to connect each level during construction.
Top down construction
This document summarizes a seminar on top down construction presented at Ajay Kumar Garg Engineering College. The seminar introduced top down construction as an alternative to conventional bottom-up construction for large projects with time or space constraints. It described the methodology of top down construction including installing diaphragm walls and piles, excavating below roof slabs with structural supports, and progressively excavating and constructing underground levels while building above-ground levels simultaneously. Advantages of top down construction are shortened timelines from simultaneous work, more early operational space, and suitability for tall urban buildings. Disadvantages include higher costs and requiring skilled supervision.
Deep excavation
The document summarizes different techniques for retaining deep excavations, including contiguous piles, secant piles, sheet piling, diaphragm walls, soldier piles with lagging, and presents case studies of their use. It discusses techniques such as contiguous piles with soil anchors used for the IT Tower Lahore project requiring excavation to a depth of 65 feet, and contiguous piling with 9 layers of anchors for the Alamgir Tower Lahore project requiring excavation to 85 feet. It also summarizes the use of slurry walls for the large Washington Convention Center project requiring excavation up to 55 feet deep.
Top down construction
Top-down construction method as the name implies, is a construction method, which builds the permanent structure members of the basement along with the excavation from the top to the bottom. Top-down method is mainly used for two types of urban structures, tall buildings with deep basements and underground structures such as car parks, underpasses and subway stations.
top down construction technique
top down construction definition
top down building construction
top down construction method definition
up down construction
top down bridge construction technique
bottom up construction method
top down bridge construction
environmental engineering project topics
final year project topics
environmental topics for projects
environmental engineering research topics
engineering final year project ideas
environmental engineering projects
final year computer engineering projects
final year project for electrical engineering
top down construction method definition
top down construction video
top down building construction
top down bridge construction
top down construction technique
top down construction
top down design definition
top down management definition
Deep excavations
This document provides an overview of deep excavation techniques. It discusses earth retaining walls used to restrain soil during deep excavations. Common types of retaining walls include braced walls, sheet pile walls, pile walls, diaphragm walls, and reinforced concrete walls. Supporting elements like ground anchors and struts are also discussed. Specific techniques covered include contiguous piles, secant piles, sheet piles, and the vertical soldiers and horizontal lagging method.
Construction Technology II (Seminar) - Deep excavation
The document discusses various aspects of deep excavation construction methods. It begins by listing the three main types of construction methods - open cut, bottom-up, and top-down. It then provides details on the top-down method, including a five-step sequence of construction. Next, it identifies two major design considerations for deep excavation as subsurface investigation/testing and evaluating adjacent foundation properties. It concludes by discussing different types of excavation support systems, including soldier piles and lagging, and identifying considerations for selecting support methods.
Microtunel Construction / Secant Pile
This document summarizes the process for constructing secant piles for a microtunnel shaft. It involves first constructing guide walls as reference points. Then female piles are drilled and concreted without reinforcement cages using lower grade concrete. Male piles are drilled between female piles, cutting through them. Reinforcement cages are installed in male piles before higher grade concrete is placed continuously from the bottom up via a tremie. The casing is gradually extracted to allow the concrete to rise above the cutoff level.
earth support
The document discusses different methods for excavation support and retaining walls, including soldier beams and lagging, sheet piling, soil nailing, tiebacks, and ground freezing. It provides examples and diagrams to illustrate soldier beams and lagging, bracing for shallow trenches, soil nailing, raker bracing for wide excavations, tied-back concrete walls, and tieback installation. It also provides more detail on ground freezing, describing it as a technique used for over 100 years for groundwater control and excavation support by circulating refrigerant through subsurface pipes to freeze soil and create a strong, watertight material.
Top down construction
This document provides an overview of the top-down construction method. It explains that in top-down construction, basement concrete slabs are poured first and act as lateral bracing for perimeter walls as subsequent levels are excavated from the bottom up. Main advantages include savings in construction time. Diagrams show the excavation process with floors poured and braced as excavation progresses downwards. Careful planning is required to properly implement this new method in Ho Chi Minh City, especially for dewatering and handling different soil types at varying depths.
Bored pile-retaining-walls
This document summarizes different types of bored pile retaining walls that can be used for underground construction projects. It describes three distinct bored pile wall systems - contiguous pile walls, secant pile walls using soft/firm concrete, and secant pile walls using hard/hard concrete. Contiguous pile walls use discrete piles installed slightly farther apart than their diameters, while secant pile walls use interlocking primary and secondary piles. The choice of system depends on factors like soil, groundwater, heights, construction time, and costs. Bored pile walls provide efficient underground space with minimal excavation and ground movement control.
Deep basement excavation
The construction site for the project will be a multi-story commercial dwelling with deep basement car park located in city centre at Smithfield where there is a high level of water content as it is in close proximity to the river Liffey, lack of space due to other buildings, traffic level are high and one way system is the only option. The design team have proposed ‘type C drained cavity’ basement that will consist of ‘secant piling system that has to be delivered in accordance with the project schedule.
2 1 excavation_basementconstruction
This document discusses excavation and basement construction. It begins by defining excavation as loosening and removing materials to create space above or below ground. It then discusses the advantages and disadvantages of using mechanical plants for excavation work. The document goes on to describe 10 common excavation plants including backhoes, bulldozers, loaders, dump trucks, and clamshell excavators. It also discusses government regulations for controlling excavation work. Finally, it describes two methods for deep excavation: the dumpling method and diaphragm walling method.
pile wall
This document discusses pile walls as a type of side support system for excavations. It provides information on different pile wall systems including contiguous pile walls, secant pile walls, and tangent pile walls. Continuous flight auger piling and rotary piling installation methods are described. The document also covers site investigation, soil parameters, structural design, load considerations, failure modes, and construction stages for pile walls.
Anchored Secant Pile Wall Presentation
The document summarizes a project to construct an anchored secant pile wall alongside a highway and neighboring properties to stabilize an area affected by a mine subsidence. Key details include that 109 overlapping concrete caissons ranging from 4-20m deep were drilled and reinforced with steel beams to form the wall. Challenges arose from inaccurate bedrock information that required caissons to be drilled deeper than anticipated, increasing steel needs. Through tracking systems and stockpiled inventory, solutions were found to acquire necessary materials and limit downtime to complete the project on schedule. The document emphasizes that contingency planning is crucial given uncertainties and that organization is key to managing challenges that arise and keeping projects on track.
Diaphragm wall
Diaphragm walls are reinforced concrete walls constructed underground using a slurry technique. The slurry balances inward hydraulic forces and prevents water from entering the trench during construction. Diaphragm walls can be between 300mm to 1500mm thick and up to 50m deep. They are commonly used in congested areas and for constructing deep basements due to their ability to be installed close to existing structures. The construction process involves excavating the trench, adding slurry to maintain stability, and lowering the reinforcement cage before pouring concrete.
basement excavation, underpinning
This document discusses various topics related to construction technology, including substructure construction methods like retaining walls, basement construction, and underpinning. For retaining walls, it describes different types such as mass walls, cantilever walls, counterfort walls, and precast concrete walls. It also covers design considerations and failure modes. For basements, it outlines the construction process and advantages, as well as tanking methods to waterproof the basement. Signs of foundation failure and reasons for underpinning existing structures are also provided.
Shoring and underpinning
This document discusses shoring and underpinning methods used to provide temporary or permanent support to structures. Shoring provides temporary stability during construction or repairs using techniques like raking, flying, or dead shores made of timber or steel. Underpinning supports existing foundations by strengthening soils using pit, pile, or chemical methods to allow additions without disturbing the structure. Proper design, installation, and precautions are needed for both techniques.
Secant piled walls dsign - تصميم خوازيق الجدران الساندة - ميكرو بايل
• A retaining wall construction method in which walls are constructed with small gaps between adjacent piles. The size of the space is determined by the nature of the soils.
• الخوازيق الساندة بيتم تنفيذها قبل حفر الموقع لأن وظيفتها سند جوانب الحفر
ولايتم الحفر قبل مرور 28 يوم على تنفيذ آخر خازوق ساند
• وبيتم استخدام الخوازيق البنتونيت فى حالة وجود مياة جوفية بمنسوب أعلى ممنسوب الحفرن
• وبيتم تنفيذ الخوازيق البنتونيت أولا ثم بين كل خازوقين بنتونيت يتم تنفيذ خازوق خرسانى بحيث يتداخل بالخوازيق البنتونيت أثناءالتنفي ولا تأثير انشائي له سواء الاملاء وسند التربة
Box Pushing Technique
Visit www.seminarlinks.blogspot.com to Download.
The intersection of railway track and the road at the same level is referred to as a level crossing. In the urban areas the level crossing is generally monitored by qualified railway personnel who monitor the train movement and close the level crossing gate to stop the interfering road traffic but such closing of gates leads to congestion in road traffic and also causes loss of time to road users. Road under bridge and road over the bridge are considered as solutions for avoiding level crossings of roads and railway track.
Underpinning
The document discusses underpinning, which is strengthening and stabilizing an existing building's foundation. Reasons for underpinning include an insufficient original foundation, changed building usage or soil properties, or nearby construction requiring soil excavation. Underpinning extends the foundation deeper or wider to bear on stronger soil or distribute load. Common methods are micropiles, jet grouting, and soil grouting. Types of underpinning include mass concrete, beam and base, and mini-piled underpinning. Mass concrete involves digging boxes and pouring concrete sequentially. Beam and base uses a reinforced concrete beam supported by mass concrete bases. Mini-piles are used for deep foundations on variable soils.
Underpinning
The document summarizes different methods of underpinning an existing foundation to support expansion of a building on the same land plot. It discusses five main underpinning methods: 1) Mass concrete underpinning which involves digging pits by hand and pouring concrete sequentially, 2) Helical piles which use steel shafts with helical flights screwed into the ground, 3) Micropiles which are small diameter drilled and grouted piles, 4) Jacked piles which involve driving steel pipes into the ground with a hydraulic jack, and 5) Bracket piles used for earth retention to support adjacent foundations during excavation. The document also lists potential causes of foundation failure such as poor drainage, weather conditions, poor soil conditions, transpiration
Mat foundation
This presentation provides details on the construction process of a mat foundation. It discusses when mat foundations are required, such as for buildings with large footprints or poor soil conditions. The 13 step construction process is then outlined, including soil testing, excavation with shoring and bracing, placing reinforcement meshes and concrete in layers, vibrating, and curing. Advantages of mat foundations include reducing differential settlement and accommodating poor soils, while disadvantages include higher costs and potential for trapped heat or water seepage.
Diaphragm walls
Diaphragm walls are underground structural elements.
It is an in-situ reinforced concrete structure that is constructed panel by panel.
Diaphragm walls are ideal for soft clays and loose sands below the water table where there is a need to control lateral movements.
Construction of substructure
1. The document discusses various aspects of constructing substructures or foundations, including site clearance, job layout, excavation methods, timbering and strutting, and different types of foundations.
2. Shallow foundations discussed include stepped foundations, wall footings, reinforced concrete footings, isolated and combined column footings, and raft foundations.
3. Deep foundations include different types of piles as well as well foundations and cofferdams. Piles are further classified based on their function as bearing, friction, sheet, anchor, batter, and fender piles.
Underpinning presentation chakamba
This document discusses technical education and underpinning foundations. It begins with definitions of technical education and underpinning. Reasons for underpinning include new construction, structural issues, soil instability, and excavation. Common underpinning methods discussed include conventional pit method, jet grouting, micropiles, needle beams, cantilever needle beams, and underpinning railway bridges. The document emphasizes that underpinning requires expert design and execution to safely renovate structures and protect surrounding buildings.
Diaphragm wall construction
The document discusses the construction of diaphragm walls. It begins by defining a diaphragm wall as a continuous reinforced concrete structure constructed panel by panel using an in-situ method. It then describes the typical construction sequence which involves building a guide wall, excavating the trench using a grab, supporting the trench with bentonite slurry, placing reinforcement, and pouring concrete to form each wall panel. The document provides details on the equipment used and explains steps like slurry cleaning and panel joining. It concludes by listing some advantages of diaphragm walls and providing examples of some deep walls constructed worldwide.
Shoring system and Dewatering
Shoring systems and dewatering techniques are used for deep excavations in Dubai to retain soil and allow for vertical excavation faces. There are various shoring system options that include wood lagging, sheet piles, secant piles, contiguous piles, and tangent piles. Dewatering is also required and involves removing groundwater from the excavation site using techniques like sump pumps. Regulations in Dubai specify requirements for excavation slopes and dewatering.
Chapter 5 formwork
Formwork is a temporary mold used to contain poured concrete until it cures and can support itself. It needs to be strong enough to support the weight of wet concrete and withstand pouring and compaction loads. New materials like steel and plastics are now used for formwork in addition to wood. Slipforming allows for continuous vertical pouring of concrete structures like building cores without relying on external support, by using a formwork that rises slowly on its own as concrete is added.
6. FORMWORK (ACE) 2160601 GTU
Form work for R.C.C. Wall, slab, beam and column, centering for arches
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earth support
The document discusses different methods for excavation support and retaining walls, including soldier beams and lagging, sheet piling, soil nailing, tiebacks, and ground freezing. It provides examples and diagrams to illustrate soldier beams and lagging, bracing for shallow trenches, soil nailing, raker bracing for wide excavations, tied-back concrete walls, and tieback installation. It also provides more detail on ground freezing, describing it as a technique used for over 100 years for groundwater control and excavation support by circulating refrigerant through subsurface pipes to freeze soil and create a strong, watertight material.
Top down construction
This document provides an overview of the top-down construction method. It explains that in top-down construction, basement concrete slabs are poured first and act as lateral bracing for perimeter walls as subsequent levels are excavated from the bottom up. Main advantages include savings in construction time. Diagrams show the excavation process with floors poured and braced as excavation progresses downwards. Careful planning is required to properly implement this new method in Ho Chi Minh City, especially for dewatering and handling different soil types at varying depths.
Bored pile-retaining-walls
This document summarizes different types of bored pile retaining walls that can be used for underground construction projects. It describes three distinct bored pile wall systems - contiguous pile walls, secant pile walls using soft/firm concrete, and secant pile walls using hard/hard concrete. Contiguous pile walls use discrete piles installed slightly farther apart than their diameters, while secant pile walls use interlocking primary and secondary piles. The choice of system depends on factors like soil, groundwater, heights, construction time, and costs. Bored pile walls provide efficient underground space with minimal excavation and ground movement control.
Deep basement excavation
The construction site for the project will be a multi-story commercial dwelling with deep basement car park located in city centre at Smithfield where there is a high level of water content as it is in close proximity to the river Liffey, lack of space due to other buildings, traffic level are high and one way system is the only option. The design team have proposed ‘type C drained cavity’ basement that will consist of ‘secant piling system that has to be delivered in accordance with the project schedule.
2 1 excavation_basementconstruction
This document discusses excavation and basement construction. It begins by defining excavation as loosening and removing materials to create space above or below ground. It then discusses the advantages and disadvantages of using mechanical plants for excavation work. The document goes on to describe 10 common excavation plants including backhoes, bulldozers, loaders, dump trucks, and clamshell excavators. It also discusses government regulations for controlling excavation work. Finally, it describes two methods for deep excavation: the dumpling method and diaphragm walling method.
pile wall
This document discusses pile walls as a type of side support system for excavations. It provides information on different pile wall systems including contiguous pile walls, secant pile walls, and tangent pile walls. Continuous flight auger piling and rotary piling installation methods are described. The document also covers site investigation, soil parameters, structural design, load considerations, failure modes, and construction stages for pile walls.
Anchored Secant Pile Wall Presentation
The document summarizes a project to construct an anchored secant pile wall alongside a highway and neighboring properties to stabilize an area affected by a mine subsidence. Key details include that 109 overlapping concrete caissons ranging from 4-20m deep were drilled and reinforced with steel beams to form the wall. Challenges arose from inaccurate bedrock information that required caissons to be drilled deeper than anticipated, increasing steel needs. Through tracking systems and stockpiled inventory, solutions were found to acquire necessary materials and limit downtime to complete the project on schedule. The document emphasizes that contingency planning is crucial given uncertainties and that organization is key to managing challenges that arise and keeping projects on track.
Diaphragm wall
Diaphragm walls are reinforced concrete walls constructed underground using a slurry technique. The slurry balances inward hydraulic forces and prevents water from entering the trench during construction. Diaphragm walls can be between 300mm to 1500mm thick and up to 50m deep. They are commonly used in congested areas and for constructing deep basements due to their ability to be installed close to existing structures. The construction process involves excavating the trench, adding slurry to maintain stability, and lowering the reinforcement cage before pouring concrete.
basement excavation, underpinning
This document discusses various topics related to construction technology, including substructure construction methods like retaining walls, basement construction, and underpinning. For retaining walls, it describes different types such as mass walls, cantilever walls, counterfort walls, and precast concrete walls. It also covers design considerations and failure modes. For basements, it outlines the construction process and advantages, as well as tanking methods to waterproof the basement. Signs of foundation failure and reasons for underpinning existing structures are also provided.
Shoring and underpinning
This document discusses shoring and underpinning methods used to provide temporary or permanent support to structures. Shoring provides temporary stability during construction or repairs using techniques like raking, flying, or dead shores made of timber or steel. Underpinning supports existing foundations by strengthening soils using pit, pile, or chemical methods to allow additions without disturbing the structure. Proper design, installation, and precautions are needed for both techniques.
Secant piled walls dsign - تصميم خوازيق الجدران الساندة - ميكرو بايل
• A retaining wall construction method in which walls are constructed with small gaps between adjacent piles. The size of the space is determined by the nature of the soils.
• الخوازيق الساندة بيتم تنفيذها قبل حفر الموقع لأن وظيفتها سند جوانب الحفر
ولايتم الحفر قبل مرور 28 يوم على تنفيذ آخر خازوق ساند
• وبيتم استخدام الخوازيق البنتونيت فى حالة وجود مياة جوفية بمنسوب أعلى ممنسوب الحفرن
• وبيتم تنفيذ الخوازيق البنتونيت أولا ثم بين كل خازوقين بنتونيت يتم تنفيذ خازوق خرسانى بحيث يتداخل بالخوازيق البنتونيت أثناءالتنفي ولا تأثير انشائي له سواء الاملاء وسند التربة
Box Pushing Technique
Visit www.seminarlinks.blogspot.com to Download.
The intersection of railway track and the road at the same level is referred to as a level crossing. In the urban areas the level crossing is generally monitored by qualified railway personnel who monitor the train movement and close the level crossing gate to stop the interfering road traffic but such closing of gates leads to congestion in road traffic and also causes loss of time to road users. Road under bridge and road over the bridge are considered as solutions for avoiding level crossings of roads and railway track.
Underpinning
The document discusses underpinning, which is strengthening and stabilizing an existing building's foundation. Reasons for underpinning include an insufficient original foundation, changed building usage or soil properties, or nearby construction requiring soil excavation. Underpinning extends the foundation deeper or wider to bear on stronger soil or distribute load. Common methods are micropiles, jet grouting, and soil grouting. Types of underpinning include mass concrete, beam and base, and mini-piled underpinning. Mass concrete involves digging boxes and pouring concrete sequentially. Beam and base uses a reinforced concrete beam supported by mass concrete bases. Mini-piles are used for deep foundations on variable soils.
Underpinning
The document summarizes different methods of underpinning an existing foundation to support expansion of a building on the same land plot. It discusses five main underpinning methods: 1) Mass concrete underpinning which involves digging pits by hand and pouring concrete sequentially, 2) Helical piles which use steel shafts with helical flights screwed into the ground, 3) Micropiles which are small diameter drilled and grouted piles, 4) Jacked piles which involve driving steel pipes into the ground with a hydraulic jack, and 5) Bracket piles used for earth retention to support adjacent foundations during excavation. The document also lists potential causes of foundation failure such as poor drainage, weather conditions, poor soil conditions, transpiration
Mat foundation
This presentation provides details on the construction process of a mat foundation. It discusses when mat foundations are required, such as for buildings with large footprints or poor soil conditions. The 13 step construction process is then outlined, including soil testing, excavation with shoring and bracing, placing reinforcement meshes and concrete in layers, vibrating, and curing. Advantages of mat foundations include reducing differential settlement and accommodating poor soils, while disadvantages include higher costs and potential for trapped heat or water seepage.
Diaphragm walls
Diaphragm walls are underground structural elements.
It is an in-situ reinforced concrete structure that is constructed panel by panel.
Diaphragm walls are ideal for soft clays and loose sands below the water table where there is a need to control lateral movements.
Construction of substructure
1. The document discusses various aspects of constructing substructures or foundations, including site clearance, job layout, excavation methods, timbering and strutting, and different types of foundations.
2. Shallow foundations discussed include stepped foundations, wall footings, reinforced concrete footings, isolated and combined column footings, and raft foundations.
3. Deep foundations include different types of piles as well as well foundations and cofferdams. Piles are further classified based on their function as bearing, friction, sheet, anchor, batter, and fender piles.
Underpinning presentation chakamba
This document discusses technical education and underpinning foundations. It begins with definitions of technical education and underpinning. Reasons for underpinning include new construction, structural issues, soil instability, and excavation. Common underpinning methods discussed include conventional pit method, jet grouting, micropiles, needle beams, cantilever needle beams, and underpinning railway bridges. The document emphasizes that underpinning requires expert design and execution to safely renovate structures and protect surrounding buildings.
Diaphragm wall construction
The document discusses the construction of diaphragm walls. It begins by defining a diaphragm wall as a continuous reinforced concrete structure constructed panel by panel using an in-situ method. It then describes the typical construction sequence which involves building a guide wall, excavating the trench using a grab, supporting the trench with bentonite slurry, placing reinforcement, and pouring concrete to form each wall panel. The document provides details on the equipment used and explains steps like slurry cleaning and panel joining. It concludes by listing some advantages of diaphragm walls and providing examples of some deep walls constructed worldwide.
Shoring system and Dewatering
Shoring systems and dewatering techniques are used for deep excavations in Dubai to retain soil and allow for vertical excavation faces. There are various shoring system options that include wood lagging, sheet piles, secant piles, contiguous piles, and tangent piles. Dewatering is also required and involves removing groundwater from the excavation site using techniques like sump pumps. Regulations in Dubai specify requirements for excavation slopes and dewatering.
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Secant piled walls dsign - تصميم خوازيق الجدران الساندة - ميكرو بايل
Secant piled walls dsign - تصميم خوازيق الجدران الساندة - ميكرو بايل
Similar to Top down construction by Sai Towers P Ltd.
Chapter 5 formwork
Formwork is a temporary mold used to contain poured concrete until it cures and can support itself. It needs to be strong enough to support the weight of wet concrete and withstand pouring and compaction loads. New materials like steel and plastics are now used for formwork in addition to wood. Slipforming allows for continuous vertical pouring of concrete structures like building cores without relying on external support, by using a formwork that rises slowly on its own as concrete is added.
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1.2 Diaphragm walls.pptx
Diaphragm walls are underground reinforced concrete structures used for retaining soil and as permanent foundation walls. They are constructed using a technique called the slurry trench method, which involves excavating narrow trenches kept full of engineered slurry to prevent collapse, and pouring concrete inside to form wall panels. Diaphragm walls can reach depths of over 60 meters, act as water barriers, and are used for constructing basements in congested urban areas due to producing minimal noise and vibration.
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Top down construction by Sai Towers P Ltd.
- 1. TOP DOWN CONSTRUCTION ADVANTAGES By Sai Towers P Ltd.
- 2. Why Top Down Construction Required • Distance between Boundary wall of Adjacent Existing Building and Building Line for New Building is too close and the depth of excavation is more than 6 meter and possibility of collapse the soil is higher during excavation. • Using Top Down Construction more Building and Basement Area can use. Suitable for two or more basement. • The first base slab level slab will act in such area as a strut member and the Retaining wall panels will not allow collapse of soil. • Water table is too high and difficult to cast Retaining wall, Diaphragm wall or Continuous Pile can use as a Retaining wall.
- 3. METHODOLOGY OF TOP DOWN CONSTRUCTION • Setting out for alignment of bore cast in situ of piles . • Bore Cast in Situ Piles to be cast and dowels bar to be kept for Retaining wall panels. The center of piles and Retaining wall panels center line to be kept in same line. The Diameter of Piles preferred 600 mm, distance between two piles center to center preferred 3.33 meters (Suit for C/C distance of Columns), Depth of Piles to be confirmed by Structural Consultants. • Touching Piles can use as a Retaining wall with supporting arrangement during Excavation.
- 4. • Water table is too high and difficult to cast Retaining wall, Diaphragm wall or Continuous Pile can use as a Retaining wall. • Instead of Column C1 to Column C8,Bore cast in Situ piles to be cast with dowel bars for different level slab and connecting Beams, The Diameter of Piles (suit as per Columns size), Reinforcement details (with dowels for Retaining wall and different level slabs and Beam), Depth of Piles to be confirmed by Structural Consultants. • Excavation to be done around 2 meter depth and retaining wall panels to be cast in stages with dowels bars with adjacent piles and dowel bars for next Retaining wall panel to be kept .if soil between piles collapsed soil nails with wire mesh to be kept on earth side to retain the same. Retaining wall panels to be cast with dowels up to the first base slab bottom.
- 5. • Dressing and compaction of soil to be done for PCC bed for casting of first base slab. 50mm PCC (M15 Grade) to be done, the top levels of PCC to be keep the base slab level bottom. For beams excavation to be done in same alignment and dimensions as required and PCC or brick work to be done as per beam dimensions in Vertical face. • After PCC 3mm ply to be laid on PCC Surface and PVC sheet to be nailed with PCC surface so surface of PCC and Surface of Slab Concrete will separate. 7. Reinforcement to be completed as per drawings, for beams dowel bar to be used from Cast in Situ Piles. Dowel bars to be keep for adjacent slabs for Bottom Up Construction.
- 6. • Concreting of Slab and Beam to be completed. • After 14 days of Concreting, PCC below slab to be break/removed excavation to be continued and retaining wall panels to be cast. Till final level of excavation. • Waterproofing to be done and base slab to be cast with dowels from Cast in Situ Piles. • Jacketing of Columns to be done if required If any query please mail – saitowers2000@gmail.com or visit - sai-towers.com