Recyclable advanced small guide pipe and use method thereof

Abstract

The invention relates to the technical field of foundation pit construction advanced supports and discloses a recyclable advanced small guide pipe. The recyclable advanced small guide pipe comprises an end head ejection device and a sleeve type grouting device. The tail end of the end head ejection device is connected with the sleeve type grouting device. The end head ejection device comprises a conical pipe head, a pressure bearing plate, a cylindrical shell, an upper rotating pipe and a lower rotating pipe. The conical pipe head is connected to the cylindrical shell through the pressure bearing plate mounted at the bottom end of the conical pipe head. The upper rotating pipe is fixedly connected to the lower portion of the pressure bearing plate. The lower end of the upper rotating pipeis rotationally connected with the lower rotating pipe. The invention further comprises a use method of the recyclable advanced small guide pipe. The use method specifically comprises the following steps of assembling the advanced small guide pipe, fixing the assembled advanced small guide pipe on a rock soil body, rotating an outer steel pipe to enable an upper clamping shell and a lower clampingshell in the end head ejection device to be staggered after the advanced support is completed and extracting the small guide pipe from a rock-soil body drill hole. By the adoption of the recyclable advanced small guide pipe and the use method, the recovery and reuse of the advanced small guide pipe are facilitated.

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

Images