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A support method for spaced necking small conduit and soft rock for tunnel excavation

A technology of tunnel excavation and small conduits, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of deformation, loose surrounding rock, and incomplete reinforcement of small conduits ahead of time, and achieve good results, reduce loosening and deformation, Enhance the effect of space reinforcement effect

Active Publication Date: 2020-09-08
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for weak surrounding rock and unevenly broken surrounding rock, the advance reinforcement of this small conduit is not thorough, which will easily lead to loosening and deformation of the surrounding rock

Method used

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  • A support method for spaced necking small conduit and soft rock for tunnel excavation
  • A support method for spaced necking small conduit and soft rock for tunnel excavation
  • A support method for spaced necking small conduit and soft rock for tunnel excavation

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Experimental program
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Embodiment 1

[0043] Such as Figure 1-4 As shown, they are respectively the elevation view of a spacer narrowing small catheter provided by the present invention, the large-scale drawing of the pushing device and the pipe tail, the large-scale drawing of the pipe body and the large-scale drawing of the pipe tip. The spacer narrowing small catheter includes a pushing device 1 and a pipe body 5, the pipe body 5 is a hollow cylinder, and a plurality of pipe body necking rings 3 and pipe overflows with diameters smaller than the diameter of the pipe body 5 are evenly arranged on it. Slurry hole 4, the pipe body slurry overflow hole 4 is circular, arranged around the pipe body 5 in a plum blossom shape, one end of the pipe body 5 is a pipe tip 7, and the pipe tip 7 is a closed cone, surrounded by A plurality of circular pipe tip slurry holes 6 are evenly distributed. Compared with the traditional unsealed tapered pipe tip, this treatment can prevent the rock and soil from blocking the pipe tip g...

Embodiment 2

[0060] Such as Figure 5 Shown is the cross-sectional shape of the tunnel and the layout of reinforcement and support in Example 2 of the present invention. This embodiment takes Figure 5 The tunnel excavation profile shown is based on the excavation, and the footage of each excavation is determined according to the length of the small conduit 8 of the pre-support advance interval necking. The upper part of the tunnel is a semicircle with a radius of 6m, and the lower part is 6m wide and 3.5m high. rectangle. The bottom of the tunnel is provided with an anchor rod 9 to prevent the bottom from arching, and the arrangement of the spaced necking small conduit 8 and the anchor rod 9 is as follows: Figure 5 shown. In the present embodiment, on the section of the tunnel by a drilling rig, the holes of the small conduits for advanced grouting are drilled. The diameter of the holes is 6 cm. The diameter of the narrowing small conduit 8 is to facilitate the installation of the sp...

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Abstract

The invention discloses an interval necking small catheter and a tunnel excavation soft rock supporting method. The interval necking small catheter comprises pushing device and a catheter body; the catheter body is a hollow cylinder, the catheter body is evenly provided with a plurality of catheter body necking rings with the diameter smaller than that of the catheter body and catheter body groutvents, the catheter body grout vents are circular and surround the catheter body in a quincunx shape, one end of the catheter body is a catheter tip, the catheter tip is in a closed conical shape, a plurality of circular catheter tip grout vents are evenly distributed in the periphery, the other end of the catheter body is a catheter tail, a thickening wall tube is arranged on the catheter tail, apushing device is detachably connected with the catheter tail, the interval necking catheter is used for tunnel excavation soft rock treatment, the interval necking small catheter is used for injecting polymer cement mortar to form the leading preliminary bracing tunnel excavation soft rock supporting method, the supporting mode adopts interval gradient supporting, the supporting effect of the interval necking small catheter is enhanced, the supporting period is shortened, the soft rock and broken surrounding rock reinforcing effect is enhanced, and tunnel contour convergence and deformationare avoided.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering construction, in particular to a small conduit with spaced necking and a support method for tunnel excavation of soft rock. Background technique [0002] With the vigorous development of expressways in our country, highway tunnels can be seen everywhere in our country. Due to the different strata and terrains in various regions, the support methods during tunnel excavation are also different. Therefore, the size and specification requirements for small conduits are also different. Same. Especially for the excavation and support of the weak surrounding rock of the tunnel, it has always been a difficult point. When excavating tunnels, weak rock formations and broken rock formations are often encountered. Advance grouting reinforcement of small conduits can achieve a good reinforcement effect. This reinforcement effect can ensure the stability of the excavation surface and make the initia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/00E21D11/10E21D20/02
CPCE21D9/001E21D11/105E21D20/021
Inventor 仇圣华李相如杨永胜郭浩
Owner SHANGHAI INST OF TECH