Cast-in-place pile casing capable of reducing lifting resistance

Abstract

The invention provides a cast-in-place pile casing device capable of reducing the lifting resistance. The cast-in-place pile casing device comprises a steel cylinder, a lifting hanging lug, parting strips attached to the steel cylinder, and an expansion bag between the parting strips. By means of the cast-in-place pile casing, the lifting resistance can be reduced, pressure balance of soil on theside wall is achieved through pressure, and foundation stabilization is facilitated; according to the cast-in-place pile casing, the hole forming construction quality of a cast-in-place pile foundation is easily guaranteed, and the design requirement can be better met; the cast-in-place pile casing is simple in structure, and under the action of large lifting force or vibration, the casing is notprone to deformation, and can be reused; the cast-in-place pile casing can counteract stress relaxation of the hole wall, and hole wall stabilization is facilitated; compared with the rigid contact mode of the pile casing and foundation soil under the condition of no expansion bag, the expansion bag is pressurized to form the flexible interface contact of the pile casing and the foundation soil, the stress concentration and the mechanical embedding and fixing effect of the interface are reduced, and the pile casing can be pulled out easily.

Description

technical field [0001] The invention belongs to construction tools for power transmission lines, and relates to a structural design and use method of a cast-in-situ pile casing that reduces lifting resistance. Background technique [0002] In recent years, cast-in-situ piles have become one of the main types of engineering foundations such as power grids, transportation, and buildings. Casings are generally used in single-pile hole-forming construction, which is conducive to meeting the design requirements for hole-forming positions and improving construction quality. [0003] At present, the commonly used cast-in-situ pile casings generally use steel cylinders. The main features are: [0004] 1. The material is steel and the cross section is round. [0005] 2. Use the lifting or locking method of the welding lugs above the cylinder, and use a crane or manual or vibration to lift. [0006] There are following deficiencies in conventional casing: [0007] 1. After excavati...

AI Technical Summary

Problems solved by technology

[0007] 1. After excavation or even after pouring concrete, due to the effect of side wall earth pressure, it is often difficult to lift due to the large resistance of the casing

[0008] 2. Vibration and other methods of lifting are easy to disturb the side wall of the pile, which is not conducive to the stability of the side wall soil and affects the quality of foundation construction

[0009] 3. Under the action of large pulling force or vibration, the casing is easily deformed, resulting in a low reuse rate of the casing

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