Construction requirements for steel sheet pile cofferdams for the 2022 first-class construction engineer municipal gold examination points, notes from the first-level construction master, press and hold to like + retweet + comment for continuous updates, click on my avatar in the Wendang version and send me a private message: 2022
(1) has a big drift Steel sheet pile cofferdams are not suitable for riverbeds with rocky and hard rocks.
(3) Before driving steel sheet piles , measurement and observation points should be set up upstream and downstream of the cofferdam and on both sides to control the driving positioning in the long and short sides of the cofferdam. When driving, guiding equipment must be provided to ensure the correct position of the steel sheet piles.
(4) Before driving, the lock mouth of the steel sheet pile should be caulked with water-stop material to prevent water leakage.
(5) The order of attack is generally from upstream to downstream.
(6) Steel sheet piles can be sunk by hammering, vibration, water injection and other methods, but water injection sinking methods should not be used in clay.
(7) Steel sheet piles that have been repaired or welded should be tested and inspected with the same type of steel sheet piles. For extended steel sheet piles, the joint positions of two adjacent steel sheet piles should be staggered up and down.
(3) Pile sinking sequence:
For dense pile groups, drive symmetrically from the middle to two directions or all around;
According to the design elevation of the foundation, it should be deeper first and then shallower;
According to the specifications of the piles, it should be larger first and then smaller. , first long and then short.
(5) Generally speaking, the design elevation of the pile end is mainly controlled, and the penetration is supplemented.
(6) During the pile sinking process, observation and monitoring of adjacent buildings, underground pipelines, etc. should be strengthened.
(7) During the pile sinking process, the construction should be suspended and measures should be taken to deal with the following situations:
1) penetration has changed dramatically.
2) The pile body suddenly tilts, shifts or rebounds severely.
3) The pile head or pile body is damaged.
4) The ground is rising.
5) The pile is floating.
