When a problem occurs in the construction of bored piles, the technical personnel on duty must immediately adopt the correct way to deal with it, and immediately report to the chief engineer and manager of the operation team. The chief engineer and manager of the operation team shall report to the chief engineer and the leader on duty according to the severity of the problem, so as to solve the problem in the shortest time and prevent the occurrence of similar piles and broken piles.

1.The collapse hole

        In the sand and silt formation is easy to collapse, after the drilling process, increase the proportion of mud (controlled between 1.2 and 1.4) to improve the hole wall structure. When the collapse hole is serious, the collapse hole position will backfill large clay and drill holes again.

2、Shaft hole

        In the soft plastic and hard plastic clay layer is prone to shrink hole, drilling bending hole, shrinkage hole, the drill bit can be mentioned to the deviation hole, until the drilling hole is upright, in case of serious bending hole, using small pieces of stone and clay block mixed, backfill to the offset hole, the packing is sunk and then drill the deviation.

3、Buried drilling and stuck drilling

        Buried drill usually with hole collapse at the same time, first processing hole collapse after drilling, after the accident, should ensure that there is enough mud hole, keep the hole pressure, stabilize the hole wall to prevent collapse, using high power mud pump drainage drill bit to eliminate resistance, and then slowly drilling, it is strictly prohibited to force, otherwise may cause more serious accidents.

4、Drop the drill bit

        It usually occurs in the circulating drill and impact drill. After the drill is dropped, keep the height of the water head in the hole, increase the mud proportion (1.15~1.3), make the L-shaped salvage hook, fixed at the bottom of the drill pipe, put the drill pipe into the bottom of the hole, and rotate the drill pipe up.

5、The cylinder sinks

        When the cylinder bottom or not fully penetrate the silt layer, easily sink, sink, if drilling soon backfill hole, long tube buried again, if close to the hole increase mud gravity (1.15~1.3) keep the mud head height in the hole, with pillow symmetry in cylinder outside, using channel steel load pole the cylinder frame on the pillow stack, into the hole as far as possible to not clear hole, steel cage rings with pillow stack weight, shorten the filling time.

6、Steel cage cage

        Hanging bar welding or hole bearing pole instability easy to cage, after the cage occurs, keep the head in the hole, increase the proportion of mud (1.15~1.4), if not filled concrete, the double L hook tied at the bottom of the drill pipe for salvage, if has perfusion part of concrete, minimize the catheter depth, the original steel cage can be abandoned in the hole, in 2 hours to a steel cage, continuous perfusion.

7、Steel cage floating up

        The pipe of pouring concrete is located below the bottom of the steel cage and the depth of the concrete buried pipe is large. At this time, the top force on the concrete has the greatest impact on the steel cage, and it is easy to float up. After the steel cage is found to be floating, stop pouring concrete immediately, measure the rope to check the accurate position of the bottom of the steel cage and the bottom of the pipe, remove the pipe, reduce the buried depth of the concrete, the bottom of the pipe rises above the bottom of the steel cage, reduce the concrete discharge speed of the tank truck, and restore the perfusion.

8、The back cover fails

        The common reason for the failure of the bottom seal is the length of the catheter into the hole, resulting in the wrong calculation of the distance between the bottom of the bottom of the pipe and the bottom of the hole, the high-power mud pump is immediately connected to the pipe, the concrete is sucked out before the final setting of the concrete at the bottom of the hole, and seal the bottom after the measurement hole depth is qualified.

9、Block pipe

        Pipe plugging is more common in the irrigation hole, and there are many reasons for pipe plugging, the concrete slump is too small, the pipe buried depth is too large, the large foreign body is blocked in the pipe, the waiting time of concrete is more than 1 hour, and no continuous perfusion is formed. At the same time, the diameter of 12~14 rebar can be used to grow into a long steel bar, and poke back and forth with manual insertion catheter. Generally, it will solve the problem of pipe blockage.

10、Hang cage

        When catheter, steel cage not straight, hole inclination is too large, concrete pouring pipe easy to hang cage, hanging cage cage on phenomenon at the same time, at this time not hard pull catheter, slightly down catheter, using artificial rotating catheter, change the catheter direction, position after experimental catheter, generally can solve the problem of hanging cage.

11、Close to the top of the pile concrete irrigation

        When concrete pouring to close to the pile top, if the pile top position is close to the surface, height difference is not enough or concrete tank car interval time is too long, prone to concrete irrigation phenomenon, this should give up tank chute on the small hopper, using the bottom cover with big hopper, calculate the amount of concrete, with crane slowly improve hopper, increase the height difference of the perfusion pipe at the same time to reduce the buried depth, perfusion can be completed.

12、Broken pile

        When the broken pile occurs, find out the position of the broken pile. If the distance is within 10 meters from the surface and the surrounding terrain has the excavation conditions, the pile can be excavated to the broken pile, and the floating slurry can be removed with the rough wood mold with a diameter greater than the pile diameter, and the pile can be connected to the design pile top. If the deep broken pile occurs, only the original pile position can be backfilled with the clay, the hole position is stable and the impact drilling, the broken pile is broken, and the broken bar can be broken with large magnets and reused.

——Source: Geotechnical Engineering Market

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