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What are the common problems and treatment methods of steel sheet pile driving?

1. The top of the steel sheet pile machine is broken, and the pile body is broken.

Reason: The pile head and pile body of the steel sheet pile machine have low concrete strength or vibration is not dense, the pile top is not flat, the protective layer is too thick, the hammer is not perpendicular to the pile, the drop hammer is too high, and the hammer strikes when encountering large blocks or hard soil. Time is too long.

Treatment method: Determine according to the actual situation, strictly control the quality of precast piles, and strengthen mechanical management. There should be no less than 25 cm thick skid between the pile hammer and the cap, between the cap and the pile head to achieve an effective cushioning effect; in order to avoid interruption of piling, the piling sequence should be strictly controlled. According to the requirements of the specification, the specific piling sequence should follow the following principles: from the center to the sides; from the middle to the periphery; from side to side; first deep and then shallow, first large and then small, first long and then short, etc. Under normal circumstances, engineering quality problems often arise from a certain detail of a certain process, so quality control should focus on the details of each process.

2. Torsion or displacement of the steel sheet pile machine.

Reason: The steel sheet pile body is not straight, the pile tip is asymmetrical, the soil around the pile is disturbed, and the hardness is uneven.

Treatment method: Strictly controlling the vertical deviation of the inserted pile is the key to avoiding pile displacement or tilt. The specific method is usually controlled by two theodolites on both sides, and the deviation shall not exceed 0.5%. The first few hammers should be as low as possible, and after a certain depth, the hammers can be lifted normally.

3. The steel sheet pile machine cannot enter.

Reason: Some geological conditions are sticky or hard, and the power of the pile driver is too small, which makes the steel sheet pile unable to enter the soil.

Treatment method: If the geological conditions are sticky or hard, use mechanical guide holes to loosen the soil, or take out the part before driving. Of course, this also has certain risks, and it will be a little difficult to get this pile of things out. If the power of the pile driver is too low, the pile driver can be replaced. Generally speaking, 90-120 vibrating hammers are required for hard geology. If it is a pile driver, 450-600 machines can be used. The above is a detailed introduction to the problems and solutions of the steel sheet pile machine. I hope it can be helpful to you, thank you!