What is the use of tremie pipe?

A tremie is a pipe that can be used for pouring concrete below ground level, often underwater. Common applications include piling works, basements, diaphragm walls, caissons, underwater foundations, and so on.

What is a tremie slab?

A tremie seal is a non-reinforced concrete slab anchored by piles against buoyancy and installed underwater by divers within sheet piling or slurry walls to control water intrusion. Typically, the perimeter sheet piling is installed, followed by anchored production piles.

What is Tremie concrete enumerate the steps involved in tremie concreting?

Tremie concrete refers to placement by gravity feed from a hopper through a vertical pipe extending for above the surface to the underwater floor. As concrete flows from the bottom of the pipe, more is added to the hopper so that the tremie pipe is continuously charged with fresh mix.

Is tremie a code for concrete?

4.3. 4 1,n case of tremie concreting for piles of smaller diameter and depth of up to 10 m, the minimum cement content should be 350 kg/m* of concrete. For piles of large diameter and/or deeper piles, the minimum cement content should be 400 kg/ m* of concrete.

How does tremie pipe work?

The lower end of the tremie pipe must be closed with a check valve before inserting it into the water. After that, freshly mixed concrete is poured with the help of hopper. When the concrete is poured, it displaces the air and water present in the pipe and finally reaches to the bed.

How are cofferdams sealed?

Grouted Seal Filled with concrete, fabric formwork creates a seal between cofferdams and the connecting surface. These are typically used to seal a sheet pile cofferdam to an existing masonry wall.

How does a concrete tremie work?

Function. The tremie is often supported by a working platform above the water level. The lower end of the pipe is kept immersed in fresh concrete so that concrete rising from the bottom displaces the water, thus limiting washing out of the cement content of the fresh concrete to the exposed upper surface.

Is 2911 Part 4 load test piles?

Broadly, piles transfer axial loads either substantially by friction along its shaft and/or by the end-bearing. The portion relating to load test on piles has been covered in a separate part, namely, IS 2911 (Part 4) : 1984 ‘Code of practice for design and construction of pile foundations: Part 4 Load test on piles’.

Is concrete a code?

IS: 456 – code of practice for plain and reinforced concrete.

How does Tremie concrete work?

Tremie concrete placement uses a pipe through which concrete is placed below water. Tremie pipe is also used to place concrete that would otherwise fall a great distance from the concrete discharge point at the top of the shaft to the concrete placement point at the bottom of the shaft.

Are cofferdams permanent?

Cellular cofferdams can be left in place as permanent structures. They can also provide crane access to different areas of the work site if a road is built across the top.

What are the advantages of cofferdam?

A cofferdam is a (usually) temporary structure that provides a dedicated barrier against water intrusion. Many construction sites use cofferdams to create a temporary dam so they can get on with their project without having to work in water, or to make the construction project possible in the first place.