A kind of recoverable advanced small catheter and its use method

Abstract

The invention relates to the technical field of advanced support for foundation pit construction, and discloses a recyclable advanced small conduit, which includes a terminal pop-up device and a sleeve-type grouting device, and the end of the terminal pop-up device is connected to the sleeve-type grouting device The end pop-up device includes a conical pipe head, a pressure plate, a cylindrical shell, an upper coil and a lower coil. The tapered pipe head is connected to the cylindrical shell through a pressure plate installed at the bottom of it. An upper coil is fixedly connected, and the lower end of the upper coil is rotatably connected with the lower coil. The present invention also includes a method for using the above-mentioned advanced small conduit, which specifically includes the following steps: assembling the advanced small conduit; fixing the assembled advanced small conduit on the rock and soil body; after the advanced support is completed, rotating the outer steel pipe so that the end The upper jamming and the lower jamming in the pop-up device are misaligned, and the small conduit is pulled out from the rock and soil mass borehole. The invention is beneficial to the recovery and reuse of the leading small catheter.

Description

technical field [0001] The invention relates to the technical field of advance support for foundation pit construction, in particular to a recyclable advance small conduit and a use method thereof. Background technique [0002] With the continuous expansion of the scale of urban construction in our country, foundation pit engineering has been widely used. The foundation pit support plays an important stabilizing role in the early construction of the foundation pit, and the advance small conduit grouting is a very effective method for the foundation pit support. The advanced small conduit grouting support can make the concrete grout flow into the cracks of the rock and soil around the conduit. After a certain period of time, the grout solidifies, and the grout and the loose rock and soil are bonded into a whole, which can strengthen the weak rock and soil and improve the The strength and stability of loose rock and soil ensure the smooth implementation of foundation pit engi...

AI Technical Summary

Problems solved by technology

[0003] Most of the advanced small conduits currently used cannot be recycled, and a large number of advanced small conduits are needed in the foundation pit support of large-scale projects. If the advanced small conduits cannot be recycled, it will cause a lot of waste of materials and increase the cost of engineering construction.

In addition, the advanced small conduits are not recovered in the foundation pit support of the city. In the later construction and construction of municipal pipelines and underground space buildings, the advanced small conduits remaining in the rock and soil will seriously affect the pipeline layout and building construction. support, reduce the construction efficiency of the project, affect the construction effect, and affect the construction of urban underground space

[0004] For example, Chinese Patent Announcement No. CN 204551486 U discloses a support structure of an anchor rod-type advanced small conduit and a sprayed reinforced concrete cylindrical thin-wall foundation pit, including an anchor rod-type advanced small conduit arranged on the wall of the foundation pit from the inside to the outside. The ring lattice steel truss it uses includes steel truss standard sections and vertical support standard sections. Arranged in multiple layers in a circular direction, it is not easy to recycle

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