What does tremie seal mean?

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.

How are cofferdams sealed?

As the name implies, a seal course seals the entire bottom of a cofferdam and prevents subsurface water from entering the cofferdam. It also controls the expansion of soils that have a tendency to expand or heave.

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 is a seal slab?

By design, the top elevation of the seal slab is the base elevation for the structural pile cap. The sheet piles and the seal slab provide the formwork for the reinforced concrete pile cap. As the function of the seal slab is primarily to provide a dry working surface, its design is relatively unsophisticated.

What is a tremie used for?

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. A tremie is made of rigid metal or plastic tubes, generally with a diameter ranging from 20 – 30 cm.

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.

How many types of cofferdams are there?

The two common shapes of the cellular cofferdam are, (i) Circular type cellular cofferdam. (ii) Diaphragm type cellular cofferdam.

Is sealing concrete necessary?

While concrete doesn’t need to be sealed, in some cases it’s a huge benefit and highly recommended. Sealing things like a concrete patio or walkway is a good idea. Adding a sealer preserves the look and longevity of the concrete while bringing out its rich color.

Why do you seal concrete?

When your exterior concrete is repeatedly exposed to the harsh elements, it gets weakened. Then cracking, scaling and other concrete problems can occur. By sealing your concrete, you enhance its durability – which can prevent damage.

How a tremie works in placement of concrete?

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.

What is tremie grouting?

DESCRIPTION. EUCO TREMIE GROUT is specially designed for use in underwater grouting applications. This highly flowable, cement based, non-shrink grout remains in a cohesive, well blended mix when placed or pumped in off-shore concrete repairs.