Cofferdams are temporary structures used to allow construction in areas that would otherwise be underwater or difficult to work in. They are enclosures that hold back water and soil to create a dry work area. Various types of cofferdams exist, including braced, earth-type, timber crib, double-walled sheet pile, and cellular designs. Proper construction and safety precautions are vital as workers will be exposed to flooding hazards. Leakage is prevented through measures like cement grouting, clay sealing, and tarpaulins.
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.
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.
The vacuum dewatering process basically improves strength, durability, and other properties of concrete by reducing the water-cement ratio immediately after the mix is placed, usually in floors and other flatwork. A Bridgeport, Connecticut vacuum dewatering demonstration, although it involved no new ...
vacuum dewatering system
vacuum dewatering pump
vacuum dewatering box
wellpoint pump systems
dewatering pump system
dewatering pump
dewatering wellpoint
small wellpoint dewatering systems
interesting civil engineering topics
civil engineering topics for presentation
civil seminar topics ppt
civil engineering seminar topics 2018
best seminar topics for civil engineering
seminar topics pdf
seminar topics for mechanical engineers
seminar topic for civil engineering pdf
Hi viewers, I am back with the various concepts of TYPES OF TESTS ON CONCRETE for civil engineers.
Here, i explained few topics
What is a concrete? Classification based o state of concrete? and various tests?
General presentation of under-reamed piles. Mainly for diploma engineers, it is really helpful as its objective, dimensions, usage, etc are shown with proper images. It will really helpful for the basic knowledge of under-reamed piles.
Pile foundation is important for construction of foundation where bearing capacity of soil is poor. Pile foundation is use for distribution of uneven load of superstructure.There are so many type of pile are use for construction. Here i present some of pile with suitable condition for construction and methods for construction.
Thank you.
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.
Types- selection of the suitable site for the diversion headwork components
of diversion headwork- Causes of failure of structure on pervious foundation- Khosla’s theory- Design of concrete sloping
glacis weir.
Quality Control in Concrete and Durability factors : An overviewbybyRAJESH PRASAD,IRSE, CPM/M, RVNL. KOLKATA. An interesting and informative presentation....
Diaphragm wall: Construction and DesignUmer Farooq
Diaphragm walls are concrete or reinforced concrete walls constructed in slurry-supported, open trenches below existing ground.
Concrete is placed using the Tremie installation method or by installing pre-cast concrete panels (known as a pre-cast diaphragm wall). Diaphragm walls can be constructed to depths of 150 meters and to widths of 0.5 to 1.50 meters.
The vacuum dewatering process basically improves strength, durability, and other properties of concrete by reducing the water-cement ratio immediately after the mix is placed, usually in floors and other flatwork. A Bridgeport, Connecticut vacuum dewatering demonstration, although it involved no new ...
vacuum dewatering system
vacuum dewatering pump
vacuum dewatering box
wellpoint pump systems
dewatering pump system
dewatering pump
dewatering wellpoint
small wellpoint dewatering systems
interesting civil engineering topics
civil engineering topics for presentation
civil seminar topics ppt
civil engineering seminar topics 2018
best seminar topics for civil engineering
seminar topics pdf
seminar topics for mechanical engineers
seminar topic for civil engineering pdf
Hi viewers, I am back with the various concepts of TYPES OF TESTS ON CONCRETE for civil engineers.
Here, i explained few topics
What is a concrete? Classification based o state of concrete? and various tests?
General presentation of under-reamed piles. Mainly for diploma engineers, it is really helpful as its objective, dimensions, usage, etc are shown with proper images. It will really helpful for the basic knowledge of under-reamed piles.
Pile foundation is important for construction of foundation where bearing capacity of soil is poor. Pile foundation is use for distribution of uneven load of superstructure.There are so many type of pile are use for construction. Here i present some of pile with suitable condition for construction and methods for construction.
Thank you.
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.
Types- selection of the suitable site for the diversion headwork components
of diversion headwork- Causes of failure of structure on pervious foundation- Khosla’s theory- Design of concrete sloping
glacis weir.
Quality Control in Concrete and Durability factors : An overviewbybyRAJESH PRASAD,IRSE, CPM/M, RVNL. KOLKATA. An interesting and informative presentation....
Diaphragm wall: Construction and DesignUmer Farooq
Diaphragm walls are concrete or reinforced concrete walls constructed in slurry-supported, open trenches below existing ground.
Concrete is placed using the Tremie installation method or by installing pre-cast concrete panels (known as a pre-cast diaphragm wall). Diaphragm walls can be constructed to depths of 150 meters and to widths of 0.5 to 1.50 meters.
Caisson foundations, also known as pier foundations, are prefabricated hollow substructures designed to be constructed on or near the surface of the ground, sunk to the desired depth and then filled with concrete, thus ultimately becoming an integral part of the permanent structure.
Suicide Prevention through Architecture (Building) and City PlanningGAURAV. H .TANDON
Suicide Prevention through Architecture (Building) and City Planning
Accessing The Potentials Of CPTED Principles In Addressing Safety Concerns Of Suicide Prevention In City Planning
Suicide Prevention through Architecture (Building) and City PlanningGAURAV. H .TANDON
Suicide Prevention through Architecture (Building) and City Planning
Accessing The Potentials Of CPTED Principles In Addressing Safety Concerns Of Suicide Prevention In City Planning
Digital Detoxing in Smart Cities.
Digital Detox for Sustainability: Unplugging/Redesigning technologies of Smart Cities for a Sustainable Future
“How a small Village in Maharashtra, India teaching importance of Digital detoxing to Mega Smart cities of India”
Digital Detoxing in Smart Cities
Digital Detox for Sustainability: Unplugging/Redesigning technologies of Smart Cities for a Sustainable Future
“How a small Village in Maharashtra, India teaching importance of Digital detoxing to Mega Smart cities of India”
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
4. Cofferdams
• “A cofferdam is a temporary structure
designed to keep water and/or soil out of the
excavation in which a bridge pier or other
structure is built.”
- Standard Handbook of Heavy Construction
5. Cofferdams
• Cofferdams are temporary enclosures to keep
out water and soil so as to permit dewatering
and construction of the permanent facility
(structure) in the dry.
7. Cofferdams
• Because cofferdams are typically constructed under
adverse conditions in a marine environment, and
because significant deformations of elements may
occur at various stages of construction, it is difficult
to maintain close tolerances.
• Ample provisions must be made for deviations in
dimensions so that the finished structure may be
constructed according to plan.
9. Cofferdams
• The loads imposed on the cofferdam
structure by construction equipment and
operations must be considered, both during
installation of the cofferdam and during
construction of the structure itself.
• Removal of the cofferdam must be planned
and executed with the same degree of care as
its installation, on a stage-by-stage basis.
11. Cofferdams
• In cofferdam construction, safety is a
paramount concern, since workers will be
exposed to the hazard of flooding and
collapse.
12. Safety Requires
• good design
• proper construction
• verification that the structure is being constructed
as planned
• monitoring the behaviour of the cofferdam and
surrounding area
• provision of adequate access
• light and ventilation, and
• attention to safe practices on the part of all
workers and supervisors.
19. Cofferdams
• Advantages of Cofferdam
• Allow excavation and construction of structures in
otherwise poor environment
• Provides safe environment to work
• Contractors typically have design responsibility
• Steel sheet piles are easily installed and removed
• Materials can typically be reused on other projects
21. Cofferdams
Items needed for Installation
• Pile driving hammer
• Vibratory or Impact
• Crane of sufficient size
• Steel sheet piles are typically used
• H-piles and/or wide-flange beams for Wales
and stringers
• Barges may be required
23. Cofferdams Types Of Imposed Loads
• Hydrostatic Pressure
• The maximum probable height outside the cofferdam
during construction and the water height inside the
cofferdam during various stages of construction need
to be considered.
25. Cofferdams Types Of Imposed Loads
• Forces due to Soil Loads
• The soils impose forces, both locally on the wall of
the cofferdam and globally upon the structure as a
whole. These forces are additive to the hydrostatic
forces.
• Lateral force on sheet-pile walls, causes bending in
the sheets
27. Current Forces on Structure
• Current Forces on Structure
• With a typical cofferdam, the current force
consists not only the force acting on the
normal projection of the cofferdam but also on
the drag force acting along the sides.
28. Wave Forces
• Wave Forces
• Waves acting on a cofferdam are usually the result of
local winds acting over a restricted fetch and hence
are of short wavelength and limited to height.
• Waves can also be produced by passing boats and
ships, especially in a restricted waterway
30. Ice forces
• Ice forces
• These are of two types:
• The force exerted by the expansion of a
closed-in solidly frozen-over area of water
surface (static ice force) and the forces
exerted by the moving ice on breakup
(dynamic ice force).
32. Cofferdams Types Of Imposed
Loads
• Seismic Loads
• These have not been normally considered in
design of temporary structures in the past. For
very large, important, and deep cofferdams in
highly seismically active areas, seismic evaluation
should be performed.
• Accidental loads
• These are the loads usually caused by
construction equipment working alongside the
cofferdam and impacting on it under the action of
waves
33. Cofferdams Types Of Imposed Loads
• Scour
• Scour of the river bottom or seafloor along the
cofferdam may take place owing to river currents, tidal
currents, or wave-induced currents. Some of the most
serious and disastrous cases have occurred when these
currents have acted concurrently.
• A very practical method of preventing scour is to
deposit a blanket of crushed rock or heavy gravel
around the cofferdam, either before or immediately
after the cofferdam sheet piles are set. A more
sophisticated method is to lay a mattress of filter
fabric, covering it with rock to hold it in place.
38. Cofferdams
• The typical cofferdam, such as a bridge pier,
consists of sheet piles set around a bracing
frame and driven into the soil sufficiently far
to develop vertical and lateral support and to
cut off the flow of soil and, in some cases the
flow of water.
40. Cofferdams
• The structure inside may be founded
directly on rock or firm soil or may require
pile foundations. In the latter case, these
generally extend well below the cofferdam.
• In order to dewater the cofferdam, the bottom
must be stable and able to resist hydrostatic
uplift. Placement of an underwater concrete
seal course is the fastest and most common
method.
42. Cofferdams
• An underwater concrete seal course may
then be placed prior to dewatering in order
to seal off the water, resist its pressure, and
also to act as a slab to brace against the
inward movement of the sheet piles in order
to mobilize their resistance to uplift under the
hydrostatic pressure.
44. Cofferdams Construction Sequence
• For a typical cofferdam, such as for a bridge
pier, the construction procedure follow the
listed pattern.
• Pre-dredge to remove soil or soft sediments
46. Cofferdams Construction Sequence
• Set steel sheet piles, starting at all four corners and
meeting at the center of each side.
• Drive sheet piles to grade.
• Block between bracing frame and sheets, and provide
ties for sheet piles at the top as necessary.
61. Design Features of Cofferdams
• The design of a cofferdam depends on various
factors such as
• Hydrostatic head of water
• Dimensions of the area to be covered by the
cofferdam
• Subsoil Conditions
• Fluctuations of outside water level
• Possibility of erosion
• Floating logs, etc.
62. Design Features of Cofferdams
• As it is, sometimes not possible to determine
accurately the forces due to these factors, the
worst condition should be assumed in the design
of the cofferdam to prevent its failure.
• It is thus, clear that a purely theoretically
designed cofferdam may fail for factors
unaccounted in its design.
• It has, therefore, become necessary to combine
practical knowledge or experience with the
theoretical aspect in the design of a cofferdam.
63. Design Features of Cofferdams
• The various thumb-rules for width and
depth of cofferdam are as follows:
• For H < 3 m, W = W
• H > 3, W= 3 + ½ (H-3)
• Where,
• W= Width of cofferdam in metres
• H= Height of water above river bed in metre.
64. Prevention of Leakage in Cofferdams
• The water enters the cofferdam in the two ways,
namely, by leakage through the sheet piling and by
under flow.
• The measures employed to prevent the leakage in a
cofferdam are as follows:
• If the entry of water is through the fissures or cracks of
the rock, it can be stopped by pumping cement grout
through pipes of about 10 cm in diameter.
• The material such as clay, sand, ashes, etc. may be
damped all round the cofferdam to reduce the quantity
of entering water.
66. Prevention of Leakage in Cofferdams
• Leakage in case of a single wall cofferdam may be
prevented by placing a V-shaped wooden trough
outside each joint and filling it with puddle.
• The interlocks of steel sheet piles may be provided with
sufficient quantity of grease before driving. Fine
materials carried by water will stick and it will make
the joints effective in preventing leakage of water.
• If the leakage is of serious nature, it is reduced by
providing tarpaulin which is canvas coated tar. The
canvas is placed over the area of leakage and it
should be seen that it is not disturbed from its
position by the force.