firstly, cut off the pile to reach the elevation position of the pile top or connect the pile to the elevation of the pile top. The retaining length of the steel bar at the pile head is the anchoring length extending into the pile cap, and it breaks outward in a funnel shape, and 3 degrees is 6 degrees from the cushion surface.

given the general design, it is assumed that the design pile top elevation is-1.6m. After earthwork excavation, the pile top elevation is marked at-1.6m according to the elevation control standard point of plus or minus ., that is, the pile top elevation, and the pile head above this elevation needs to be removed. The elevation of the bottom of the pile cap is generally 5cm higher than that of the pile top, because the design usually requires that the pile top should extend into the pile cap by 5cm.

Extended information:

Dry hole grouting is very simple. Just punch the elevation at the orifice and measure it directly with a steel tape. It is difficult to control underwater perfusion. First, we should judge the pouring amount of concrete according to the empirical filling coefficient, and then use tools to detect the position of concrete surface. The measuring hammer can be directly tied to the measuring rope, and the measuring hammer can be welded together with three 18-piece steel bars, and the weight is subject to the comfortable feel.

Then weld a nose on the steel bar to tie the measuring rope, and finally calibrate the measuring rope, and it can be used. When measuring the concrete surface, the measuring hammer should sink into the concrete and feel the resistance of stones. This method is suitable for the case where the orifice is far away from the concrete surface.

chisel away the protective concrete on the outside of the steel bar to expose the steel bar, and then drive the concrete inside the reinforcement cage into three points along the circumference, and use tension to separate the upper pile head from the lower part (because the concrete has excellent compression resistance, but weak tensile strength). Then use a crane or excavator to clear it out.

Baidu Encyclopedia-Cutting Pile Head

Baidu Encyclopedia-Pile Top Elevation