Air-lift reverse circulation device for cast-in-situ bored piles

Abstract

The invention discloses an air-lift reverse circulation device for cast-in-situ bored piles, and relates to the technical field of the cast-in-situ bored piles. The air-lift reverse circulation devicefor the cast-in-situ bored piles comprises a base, a working platform, a guide pipe and an air pipe; the base is detachably mounted on the working platform, and the lower end of the base is detachably connected with the guide pipe and the air pipe; and the air pipe is located at the axis of the guide pipe, and the upper end of the base is provided with an air feeding connector, a pressure monitoring connector and a deslagging connector. The detachable steel air pipe and guide pipe are mounted on the base, meanwhile a three-way air feeding pipe is mounted on the base so that pressure monitoring and relieving can be achieved, and the air-lift reverse circulation device is suitable for sediment removing and mud exchange of the cast-in-situ bored piles and suitable for application and popularization in foundation engineering.

Description

technical field [0001] The invention relates to the technical field of bored piles, in particular to an air lift reverse circulation device for bored piles. Background technique [0002] Cast-in-situ pile refers to the pile hole formed in the foundation soil by means of mechanical drilling, steel pipe extrusion or manual excavation at the project site, and a pile made by placing a steel cage and pouring concrete in it. According to different hole-forming methods, Cast-in-situ piles can be divided into several categories such as immersed pipe piles, bored piles and bored piles. [0003] The control of the thickness of sediment at the bottom of the hole is one of the important indicators of the quality of punching (drilling) cast-in-place piles, and its quality will directly affect the bearing capacity of cast-in-place piles, especially for end-bearing piles or The effect of friction end-bearing piles is even more serious. Therefore, effective removal of sediment at the bott...

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Problems solved by technology

[0004] Gas-lift reverse circulation has been widely used in the construction of bored piles. However, the gas-lift reverse circulation device currently used also has the following defects: the selected air duct of the gas-lift reverse circulation device is an integrally formed hose. It is easy to bend and affect the gas lift reverse circulation, and the duct is also an integrated steel pipe. During the operation, the air duct and duct need to be customized according to the actual situation of the cast-in-place pile, and it is inconvenient to disassemble and assemble, so it is not suitable for use; The base and working platform where the duct is installed are relatively simple, and it is not easy to achieve stable fixation. At the same time, the interface on the base is directly connected to the air compressor and the energy dissipation box (slag discharge pipe), which cannot realize the monitoring and relief of the pressure in the air duct. It is suitable for popularization and application; secondly, the base of gas lift reverse circulation also has a lot of inconvenience when it is installed in the pile hole of the bored pile

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