Diameter-expanding fixing cylinder for preventing hole collapse of pile foundation pit

Abstract

The invention discloses a diameter-expanding fixing cylinder for preventing hole collapse of a pile foundation pit. The diameter-expanding fixing cylinder comprises a cylinder wall I, a cylinder wall II and a forked lowering rod; the cylinder wall I and the cylinder wall II are formed by equally dividing a cylinder, and ratchet and pawl structures are arranged on the corresponding vertical edges of the cylinder wall I and the cylinder wall II; the forked lowering rod comprises a sliding groove and a push rod installed in the sliding groove, the lower end of the push rod is hinged to two supporting legs, and clamping ends are arranged at the ends of the supporting legs. The diameter-expanding fixing cylinder is ingenious in design, after the diameter-expanding fixing cylinder is placed at a proper position, a cover buckle can be jacked out through the push rod, and the push rod can be smoothly retracted after the cover buckle is jacked out; in the pushing-out process of the push rod, the two half cylinder walls can be pushed out, and the cylinder walls can be driven to be separated in one direction after being pushed out; the push rod plays a lifting role in the lowering process of the diameter-expanding fixing cylinder, the cylinder walls on the two sides can be fixed through the design of the ends, the design is ingenious, the adaptability is high, and the diameter-expanding fixing cylinder is worthy of popularization.

Description

technical field [0001] The invention relates to the technical field of pile foundation construction, in particular to a fixing cylinder for preventing pile foundation pit from collapsing and expanding the diameter. Background technique [0002] Pile foundation is a deep foundation that bears dynamic and static loads, and piles are vertical foundation components set in the soil. On the bearing layer of the foundation, which is more compact or less compressible, we usually refer to the piles in the pile foundation as foundation piles. Pile foundation is a foundation form with high bearing capacity, wide application range and long history. With the improvement of production level and the development of science and technology, the type, technology, design theory, calculation method and application range of pile foundation have been greatly developed, and they are widely used in high-rise buildings, ports, bridges and other projects. With the continuous development of urban con...

AI Technical Summary

Problems solved by technology

[0004] In addition, there are many reasons for the collapse of the hole. Whether it is the drilling process or the process of lowering the reinforcement cage, the hole collapse may occur. Some of the reasons are as follows: (1) The groundwater level is shallow and the consistency of the mud does not meet the requirements. , the effect of the wall protection is not good, and it cannot withstand the surrounding water pressure

(2) The soil layer is too soft, or there is a fine sand layer in the depth range of the pile foundation, which is easy to form quicksand phenomenon

(3) Damage and damage the hole wall during drilling or lowering the reinforcement cage

(4) Before the pile foundation is poured with concrete, the surrounding piled load is relatively large

[0006] The existing preventive measures can reduce the occurrence of hole collapse, but there is no good solution for the deep soil quality mixed with silt layer, quicksand, etc. The following shortcomings are common: (1) Deep foundation pits cannot be solved (2) Even if a steel drum is used as the retaining wall, it is often difficult to control the diameter of the steel drum during the construction process, and it is often difficult to lower the steel casing, or the casing will automatically go down after being lowered to the required position Shen and other issues

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