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Tunnel secondary lining arch crown back filling grouting process and grouting pipe

A technology for grouting pipes and vaults, which is applied in the direction of tunnel lining, tunnels, pipes, etc., can solve the problems of troublesome positioning operation of grouting pipes, insufficient grouting, etc. solid effect

Inactive Publication Date: 2019-05-03
RANKEN RAILWAY CONSTR GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the grouting of the existing tunnel second lining vault is not full enough during grouting, and the positioning operation of the grouting pipe is troublesome

Method used

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  • Tunnel secondary lining arch crown back filling grouting process and grouting pipe
  • Tunnel secondary lining arch crown back filling grouting process and grouting pipe
  • Tunnel secondary lining arch crown back filling grouting process and grouting pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as Figure 1-Figure 2 As shown, a backfill grouting process for the second lining vault of the tunnel, specifically includes the following steps:

[0042] Step 1: Open a grouting hole on the trolley top mold 1;

[0043] According to the length of the second lining trolley, holes are opened on the center line of the top mold 1 of the trolley, with a diameter of 40mm, and are evenly arranged from the lined end to the lined end. From the lined end to the lined end, the first grouting hole is set at a distance of 0.75m from the lined end 9, and then a grouting hole is set at an interval of 3.5m, and the last grouting hole is set at a distance of 0.75m from the lined end.

[0044] Step 2: welding a fixed flange at the grouting hole, and installing a positioning flange 10 on the fixed flange;

[0045] Weld the fixed flange at the opening position of the trolley top mold 1. The outer diameter of the fixed flange is 120mm and the inner diameter is 40mm. It is used to fix...

Embodiment 2

[0056] The difference between this embodiment and Embodiment 1 is that after the concrete 2 is finally set, the positioning flange, connecting sleeve, and grouting pipe fixing pipe are disassembled, and the formwork surface should be lowered below the RPC grouting pipe 7 to avoid walking Squeeze the RPC grouting pipe 7 during the trolley, and then backfill the grouting until the end die vent hole flows out of the thick slurry and stop the grouting. After the grouting is completed, the leaking part of the grouting pipe shall be cut and polished with an angle grinder.

Embodiment 3

[0058] Such as figure 2 As shown, a grouting pipe 7 is used for backfill grouting of the second lining vault of the tunnel. The top nozzle of the grouting pipe 7 is provided with a notch 70. When grouting into the grouting pipe 7, the grout will Flow along the notch 70 to the periphery of the grouting pipe 7 to fill the empty area 3, so that the filling is fuller.

[0059] The grouting pipe 7 is an RPC grouting pipe 7 .

[0060] The top nozzle of the grouting pipe 7 is provided with a cross groove, the width of the notch 70 of the cross groove is 1 / 15 to 1 / 5 of the outer diameter of the grouting pipe 7, and the depth of the notch 70 is the 1 / 10 to 1 / 5 of the outer diameter of the grouting pipe 7, too deep and too wide a notch 70 will affect the strength of the grouting pipe 7, and too small a notch 70 will affect the flow of the grout. The strength of the grouting pipe 7 can be guaranteed, and the grout can be guaranteed to flow out from the grouting pipe 7 quickly without ...

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Abstract

The invention discloses a tunnel secondary lining arch crown back filling grouting process and a grouting pipe, and solves the problems that during the back filling grouting of the existing tunnel secondary lining arch crown, the grouting is not full enough; and the positioning operation of the grouting pipe is troublesome. The process comprises the following steps of installing the grouting pipe;inserting the grouting pipe into a grouting hole; extending the grouting pipe to a state of propping up a waterproof plate; casting concrete; performing grouting after initial setting; after the grouting is completed, performing demoulding after the final setting of concrete; moving a trolley to a lower position; and cutting a cross-shaped opening by jacking a top end pipe opening of the waterproof plate by the grouting pipe. The process provided by the invention has the advantages that the grouting in the separation region is full; the positioning of the grouting pipe is accurate; and the operation is convenient, and the like.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering construction, in particular to a backfilling grouting process and a grouting pipe for the second lining of a tunnel. Background technique [0002] With the development of transportation, especially the large-scale construction of rail transit, tunnel engineering has become one of the main projects of construction. When the secondary lining concrete of the tunnel is poured with a secondary formwork trolley, due to factors such as air pockets in the vault of the waterproof plate, insufficient concrete fluidity, and insufficient concrete pouring volume, voids will appear in the vault, which needs to be backfilled and grouted. [0003] The backfill grouting process has made great progress from the traditional embedded galvanized steel pipe or PVC pipe to the current RPC pipe. However, during the backfill grouting process, there are always problems such as insufficient filling, or troubleso...

Claims

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Application Information

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IPC IPC(8): E21D11/10F16L9/12
Inventor 廖建东陈科颖彭艳郭俊强韩永刚邵文彬
Owner RANKEN RAILWAY CONSTR GROUP