What is cut of length of pile?
What is cut of length of pile?
Pile Cut-off level is the actual level at which the piles below pier are made to be of the same level. The concrete of pile is cut-off at the specified level (given in the specifications or drawings usually around 75 mm) while the steel is kept projected in-to the pile cap to make an effective bond.
What is pile cap level?
The pile cap should overhang the outer piles, typically by a distance of 100-150 mm on all sides, depending on the size of the piles. Pile caps are constructed by excavating an area around the group of piles to enable formwork to be inserted. The pile tops may be trimmed to ensure they are at the same height.
How do you cut concrete piles?
Cropping is carried out by drilling a hole into the side of the pile, at cut off level, and using a split tube and wedge (either hydraulically powered on larger piles or hand driven on smaller piles to split the concrete). The surplus concrete is removed by lifting with a crane or excavator as a single piece.
Why pile head is removed?
To prevent the accumulation of the sediments, impurities, and laitance in immigrating from the bottom of the pile to the top, the pile is concreted above the cut-off level. This in turn is trimmed from the cut-off level to remove this weak layer.
What is pile head?
Summary. Pile Head – A pile head is an enlarged concrete section constructed over the top of a pile which helps spread the supporting force that the pile exerts on the structure it is holding.
What is pier foundation?
A pier foundation is a collection of large diameter cylindrical columns to support the superstructure and transfer large super-imposed loads to the firm strata below. It stood several feet above the ground. It is also known as “post foundation”.
What is mat foundation?
A raft or mat foundation is a large continuous rectangular or circular concrete slab that carries the entire load of the superstructure and spreads it over the whole area beneath the building. It is considered as one type of shallow foundation and is useful in controlling the differential settlement.
Where is pile cut-off level?
Pile cut-off level is the actual level at which the concrete piles are placed underneath the pier so they can retain the same level. Pile cut-off level is provided in the specifications drawings, normally around 75mm.
What is a blinding in construction?
In construction, ‘blinding’ typically refers to a base layer of weak concrete or sand that is laid above a layer of hardcore to provide a clean, level and dry working surface.
What is pile final set?
The final set and temporary compression (also known as the elastic rebound) of pile and soil of a driven H-pile are conventionally measured manually by a worker standing next to a pile during pile driving.
Why Bentonite is used in piling?
Bentonite helps to maintain the quality of concrete in the pile foundation. If bentonite is not used, the soil particles may get mixed with the poured concrete, resulting in a lower grade of concrete. 4. Bentonite acts as a lubricant material for the pile driving equipment & hammers reducing the boring friction.