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Construction portfolio (manvi)



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Construction portfolio (manvi)

  3. 3. INTRODUCTION TO PRE-FABRICATON Pre-Fabrication system, involves processing and assembling of structural components such as beam, columns and slab in a factory or other manufacturing site and transported on site. The system consists of using precast structural components such as • Dense concrete, • hollow core columns, • Dense concrete partially precast beams, • lintels, staircase, etc. to achieve strength, safety and speed. INTRODUCTION TO THE PROJECT • To overcome the problem of migration From rural area to urban area , Mass housing has been introduced especially For EWS and LIG groups. • The basic concept of mass housing is speedy construction which is a major advantage of precast technology and cost is reduced. • The method finds application particularly where the structure is composed of repeating units or forms, or where typically same basic structure are being constructed. PRODUCTION OF PRE-CAST MATERIAL 1. QUALITY OF MATERIAL: As soon the pre-production materials such as crushed sand, cement, coarse aggregate reaches the factory, these materials are monitored and measured as per the specification of contract. After this proper testing of material is required .
  4. 4. Following are the quality control test: • Moisture Correction • Workability Testing • Cube Testing • Aggregate Testing • Silt Content Test • Water Test • Temperature Testing • Slump Cone Test • Fly Ash Testing • Cement Testing 2.CASTING OF STRUCTURAL ELEMENTS: a) Precast Beams. As per the requirement of the building the various types of beam such as chajja beam, roof beam, floor beam, plinth beam, are manufactured. MANUFACTURING PROCESS: • The construction of the beams initiate by arranging the reinforcements as per the designs. • After this the coveris attached to the reinforcements and then placed in to the certified moulds. • The mould is oiled from inside before the placement of the reinforcements. • After placing the reinforcement the concrete is poured in the mould. The slump of the concrete is 70mm. • To eliminate the voids which are present in the concrete, compaction is done by vibration either manually or hydraulical arrangement. • The period of 15 hours is provided so that the concrete gains it’s required strength, CURING : 15 Days curing is done and then dispatched for erection purpose on site .
  5. 5. B)Precast columns: The columns are manufactured in the factory as per the requirements includes single core and multi-core columns. MANUFACTURING PROCESS: • The construction of the columns initiated by arranging the reinforcements as per the design. • Before placing the reinforcement the pallet should be oiled properly. These columns reinforcement is placed on the pallet along with the plates at the end to provide opening for the notches. • After this, the pallet is moved forward with the help of lorry. The core is then inserted hydraulically. This is followed by pouring of concrete in the pallet with the help of bucket. The capacity of bucket is 1.5 cubic meters. • The concrete in bucket is poured from the adjacent batching plant. • After pouring, uniform spreading of concrete is done manually. • For removing the voids hydraulic vibrators are provided below the pallet. • Core is taken out after the setting of the concrete. Proper surface finish is achieved with the help of floater machine. CURING: Further, the pallet is moved forward with the help of lorry and the entire pallet is covered with the plastic, so as to use the moisture generated by the heat of concrete is for curing.
  6. 6. C) Precast slab: Slabs are design as per the requirement MANUFACTURING PROCESS • Before placing the reinforcement the pallet should be oiled properly. The reinforcement of the slab consists of a mesh and lattice girder. • The mesh and the lattice girder are manufactured with the help of machines. These are the tied manually. • After this the covers are provided and electrical conduits are placed. These reinforcement are placed on the pallet and moved forward with the help of lorry. • The concrete is poured with the help of bucket having capacity of 3 cubic meters. • The slump of concrete maintained is 55mm. • For removing the voids hydraulic vibrators are provided below the pallet. For a single pallet 4 vibrators are provided. CURING: After pouring, uniform spreading of concrete is done manually. After the concrete is compacted the pallet is moved forward in the curing chamber for thermal curing for a period of 24 hours.
  7. 7. MANUFACTURING PROCESS • According to design the reinforcements are arranged and while placing the reinforcements the moulds are oiled. • The mould is designed in such a way that 2 flights staircase are casted at a time. • The reinforcements are inserted in the mould manually. • After this concrete is poured from the bucket with the help of remote control cranes. D) Precast staircase The pre-casted staircase consists two flights which includes floor landing to mid landing and mid landing to floor landing. CURING :After 24 hours the moulds are removed and then lifted with the help of cranes and placed in the stacking yard. Curing is done for 7 days • For the installation or erection of staircase, notches are made in the columns while casting in which the beams are allowed to rest. • These beams are provided for supporting the mid-landing of the staircase. • The beam should be arranged properly so that the level of mid landing is exactly at a distance equal the half of floor to floor height. • After this the mid landing is allowed to rest on these beams and reinforcements are then provided. • Then the prefabricated staircase are placed between floor landing to mid landing and then midlanding to floor landing. INSTALLATION
  9. 9. ORIGINS OF PRECAST CONSTRUCTION • Ancient Romans used to pour concrete into molds to build aqueducts, culverts and tunnels beginning around 100 B.C. • In modern times, precast was first utilized in Liverpool, England by then city engineer John Alexander Brodie in 1905. Later, the method was widely adopted in Eastern Europe and Scandinavia. WHAT BRINGS PRECAST INDUTRY IN ENTHOPIA ? • The in-situ construction activities being carried out in Ethiopia can be broadly categorized into two. • In the first category, there are the construction projects, usually big scale ones, where theirs are professional project managers, site supervisors, and site engineers and that these persons fulfill their responsibilities with sufficient capability, honesty, and integrity. • In the second category, we find projects that are essentially ridden with lack of supervision, poor quality management, and corrupt practices. • The amount of water used to mix concrete is rarely measured, which means the strength of the finished concrete is not known. • Hence, there is an abundance of irregularities in terms of quality of concrete structures in Ethiopia. • Lack of a practical method to choose between a precast method of construction and an in situ method of construction, according to the shape, size, type, desired quality, and speed of a construction project. • Assumption that precast construction is typically less economical than in-situ construction. disregarding the indirect effects that construction • Lack of conclusive information and data about the current working capacity of PBPPE, which is needed to know, if precast construction is to be realized in Ethiopia. PROBLEM FACED
  10. 10. PREPARATION PROCESS OF PRECAST • There are a number of ways that each of the above processes can take place. • First, the location of where to cast the RC members has to be decided. • Availability, price, and, convenience of using heavy trucks for transportation or heavy duty precision cranes for onsite installments have to be compared. • NEXT what kind of bolts to use to fasten the elements together, the amount of tension to be applied to the rebars, and similar factors that have to do with rebar arrangement in precast • NEXT Consolidation is one of the most important processes that must be applied to freshly cast concrete. It is primarily done by vibrating the freshly poured concrete mix. THE PRECAST ERECTION PROCESS • Four basic concerns face the people charged with responsibility for erection of precast: concrete members: the weight and size of the member • Temporary bracing that will be required; and the individual site problems. • The weight of the largest individual precast concrete member to be handled on a project will dictate the size of the crane and hauling equipment required.
  11. 11. ERECTION SEQUENCE • Too often the sequence of erection is not considered during the design stage but this sequence becomes important at the start of construction, especially when Critical Path Method of scheduling is planned. • The relationship of erection sequence to construction of elevator shafts, shear walls and stairways is necessary in multi-story erection. TRANSPORTATION • truck delivery is the usual form of transportation and scheduling of truck deliveries is a never- ending problem. • Due to the weight of precast concrete members, a large number of truck loads are involved. • Usually the members are taken directly from the trucks and set in place. • This requires predetermining the exact erection sequence. Each truck must be loaded with respect to mark number, position on trailer, and time of delivery.
  14. 14. COST SUMMARY FOR FOR SKELETON PROJECT: ISLAMIC AFFAIRS BUILDING PREFABRICATED BUILDING ELEMENTS The total precast construction price in Table 4.5 is inclusive of PBPPE’s profit margin of 15%. This means the actual construction cost is: ETB 6,040,690.87 / 1.15 = ETB 5,252,774.67
  15. 15. PROJECT: ISLAMIC AFFAIRS BUILDING IN-SITU CONSTRUCTION COST COST SUMMARY Total estimate 3,052,229.96Br • Excluding transportation & 15% profit
  17. 17. 5.83 138 804.54 11.66 138 1,609.08 17.49 138 2,413.62 23.32 138 3,218.16 29.15 138 4,022.7 34.98 138 4,827.24 TOTAL 16,895.34 Story 1 2 3 4 5 6 Crane Time Per Item (Minutes Avg. No. of Precast Items Total Crane Time (Minutes) • It took a total of 16,985.34 minutes to lift and place the total number of precast items. • That is almost 12 days for lifting elements. • There are on average 138 items that have been lifted for every story of the Islamic Affairs building during its construction. AVERAGE LIFTING TIME SCORING INDEX
  18. 18. Punjab Kesari Headquarters ➢ Fusion of traditional Indian architecture and contemporary OFFICE BUILDING ➢ Located at an urban corner in Delhi NCR. ➢ Designed by Studio Symbiosis Architects ➢ Construction completed in 2017 Submitted by : MANVI VARSHNEY SUBMITTED TO : AR. PREETI NAIR AR. SAMREEN SULTAN
  19. 19. ➢ Punjab Kesari Headquarters is designed as Fusion of traditional Indian architecture and contemporary office space, the main objective is to reduce heat gain and optimize façade opening ratio, ensuring no artificial lighting is required on a typical day. ➢ An animated façade is designed as an outcome of different façade opening ratio depending on the orientation. INTRODUCTION ➢ The project site area is 5220 sqm with plot dimension of 87m x 60 m. ➢ The allowed coverage was 50percent out of which only 43percent was utilized to fulfil the fire safety rules. ➢ The outlook for the client was to create a flexible model whereby they occupy one floor and rent out the rest as office modules of 500 sqm each. ➢ Located in a commercial/ industrial zone the total built up area is 18,000 sqm with a height restriction of 23 meters. ➢ The building dimensions are 70m x 41m x 21m.
  20. 20. ➢ A central Atrium connects the various floor, creates a diffused boundary condition And a visual porosity between people working on different floors. ➢ Since the design looks at no artificial lighting to make the user feel closer to nature and allow to work in natural lighting. C.O.N.C.E.P.T OF ATRIUM & BREAKING THE BOUNDARY B/W HUMAN & NATURE ATRIUM
  21. 21. ➢ Sustainability is at the epi-center of the project embedded in form of, optimized natural lighting, cross ventilation and reduction of heat gain. ➢ The colder air is going in and pulled into the atrium through the chimney effect of the atrium space and resulting in natural ventilation and reducing the indoor air temperature naturally so the cooling load for the air conditioning is reduced.
  22. 22. Being an office space the building is seen as an interaction zone by creating moments allowing informal interaction. A central atrium connects the various floors creating a diffused boundary condition and a visual porosity between people working on different floors. Since the design looks at no artificial lighting it makes the user feel closer to nature and allow to work in natural lighting. A sense of invitation with an urban lobby is created whereby the landscape flows inside the building creating seamless movement trajectories.
  23. 23. V O L U T I O N D E S I G N
  24. 24. DIGITAL SIMULATION ➢ The inspiration was to translate a traditional Indian façade pattern by using digital simulations into an iterative processes to create a responsive built form. ➢ Lux level of 500 has been achieved in the building at a workstation height from each floor plate, along with a daylight factor of 2 over 80% of the floor plate; this is done to ensure that artificial lighting is not required inside the building on a normal
  25. 25. CANWE IMPROVETHERMALCOMFORTTHROUGH DIGITAL SIMULATION ? ➢ The scenario considered is a hot summer day when the outside temperature is about 32°C. The effect of cooling systems is investigated. The cooling system has a passive outlet and an active inlet. ➢ A natural convection heat transfer process is chosen. For a preliminary design analysis, it would be sufficient to assume that the flow is laminar and has reached a steady state. ➢ In reality, HVAC designers only need to consider the steady state rather than the initial transient state. ➢ Thus, the model described here is as near to reality as possible. ➢ The initial velocity is zero while the pressure is atmospheric pressure.The initial temperature in the room is set at 30 °C. The conditions of the room after approximately 15 minutes (1000 sec) is reviewed and discussed. We compare two simple scenarios to start with : In the first case, the inlet for colder air is above, while a passive outlet (outlet at atmosphere pressure) is provided at the bottom. In the second case, they are exchanged. In each of these cases, the walls are considered to be adiabatic or do not otherwise conduct. 1 Fig :Comparison of velocity streamlines for variation in placements of inlets/outlets.
  26. 26. ➢ If the office was on the top floor, and we maintain the assumption that the roof is badly insulated, then the roof can be almost as warm as the outside conditions on a hot summer’s day (say 32 °C). Now, with all walls (including roof and floor) adiabatic, is still on the right. And where the roof is heated up, is illustrated on the left. As expected, there is a strong counter-current from the roof that is heating the room. 2 In this scenario, a constant temperature boundary condition is assigned to this wall.The comparison for such a scenario is as shown in Figure. Contrary to the assumption that this could impede air cooling, such a scenario actually facilitates better cooling by increasing the flow of air across the room. Comparison of velocity streamlines for an office space with all walls adiabatic (right) and with one not-so-well insulated external wall (left) 3
  28. 28. EVOLUTION OF PATTERNWHITE EVOLUTION OF PATTERN BLACK • A hexagonal pattern was used as a base and through iterative process various porosity patterns were generated from it to create different light conditions. • This resulted in a variable opacity condition in the facade that had a dual purpose of creating performative architecture and also created variable openings on the facade in various orientations generating a design for the facade that is animating and has an inherent meaning. • This resulting pattern morphs from 81% opacity on the north facade to 27% opacity on the south facade, with an intermediate opacity of 54% on East and 62% on west facade respectively. • The Jali facade is made of Glass Reinforced Concrete panels. The curvature of the entrance will be also casted whereby by using digital fabrication of mould a higher accuracy in the design is achieved.
  29. 29. DOUBLE SKIN FAÇADE ➢ Act as ‘warm blanket’ Around the building, reducing heat intake ➢ Blocked solar radiation 35 C – 45C outside. ➢ Blocked solar radiation.
  30. 30. OPENING RATIO IN WHITE OPENING RATIO IN BLACK ➢ The inspiration was to translate a traditional Indian façade pattern by using digital simulations into an iterative process to create a responsive built form. This traditional “Jali” screen creates culturally a sense of belonging. ➢ Lux level of 500 has been achieved in the building at a workstation height from each floor plate, along with a daylight factor of 2 over 80% of the floor plate; this is done to ensure that artificial lighting is not required inside the building on a normal day.
  34. 34. CROSS SECTION OF BUILDING Lux level of 500 has been achieved in the building at a workstation height from each floor plate, along with a daylight factor of 2 over 80% of the floor plate; this is done to ensure that artificial lighting is not required inside the building on a normal day.
  35. 35. GRC PANEL CONSTRUCTION DETAILS • Housing formula GRC, "Glass Fibre Reinforced Cement" is a compound material being its matrix a concrete reinforced with glass fiber dispersed in all its mass. • The resulting compound is a panel of 10 mm thickness approximately and it is characterized by its extreme lightness (between 30 and 80 kg/m², depending on the type of GRC panel), high resistance to bending, traction and impact, resistance to atmospheric agents, incombustibility, waterproof, versatility, etc. • Façades made with GRC panels of Housing formula panels allow to give the building a magnificent architectural and aesthetic value. GRC in construction industry: •Façade panels and cladding. •All kinds of façade elements. •Permanent or reusable formwork. •Modular systems of housing. •Transformers and surveillance huts. •Electrical boxes. •Renewal and restoration of façades and architectural accessories. •Elements for roofs. •Interior decoration: ceilings, false ceilings, columns... •Swimming pools. •Barriers and fences. •Lattices. •Fascia for bridges. •Pavements. •GRC for tunnels (paneled or without them) and sewers.
  36. 36. ➢ Punjab Kesari headquarters won the International property award for best office Architecture India 2016- 17. ➢ It was presented at Tedx talk in Bremen, Germany in 2015 by Britta Knobel Gupta as a part of the talk Performative Aesthetics and at Smart Geometry Hong Kong 2014. ➢ Punjab Kesari Headquarters by Studio Symbiosis in India won the WA Award Cycle 23. projects/hhzhm/punjab_kesari_headquarters- project-pages.html Occupant behavior has significant impacts on energy use in buildings. A simulation approach is proposed to estimate energy savings of behavior measures. Behavior measures can achieve up to 41.0% savings based on the simulation results. Occupancy schedule significantly affects the energy savings of behavior measures.