Tunnel cross-section primary lining construction process

A technology of construction technology and cross-section, which is applied in the direction of tunnel lining, tunnel, shaft lining, etc., can solve the problems of scaffolding erection height and span, limited external transportation of muck, and large amount of muck, and achieve good promotion and application prospects. The effect of reducing risk loss and producing less slag

Inactive Publication Date: 2018-09-14
CHINA RAILWAY 12TH BUREAU GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The windy weather does not allow the transportation of muck, and the influence of various political activities often leads to restrictions on the transportation of muck, resulting in slow construction and easy to cause layoffs
[0003] During the initial construction of some tunnel sections, the height and span of

Method used

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  • Tunnel cross-section primary lining construction process
  • Tunnel cross-section primary lining construction process
  • Tunnel cross-section primary lining construction process

Examples

Experimental program
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Embodiment

[0042] see Figure 4-Figure 10 , a tunnel section initial laying construction process, comprising the following steps:

[0043] S1, see Figure 4 According to the 6m section, the lower part of the middle partition wall and the primary concrete within the thickness range of the secondary initial laying of the inverted arch are chiseled, and the lower part of the grid main reinforcement 500 is cut off to form the filling part 320; the grid main reinforcement 30cm below the inverted arch surface Not cut off, poured directly in the inverted arch;

[0044] S2, see Figure 5 , laying waterproof layer 610, tying steel bars, pouring inverted arch concrete, pouring filling part 320, forming inverted arch 310;

[0045] S3, see Image 6 , demolish within 1m at both ends of the partition 410, remove the primary concrete within 2m from the top of the partition (to the position of the gusset plate), and cut off the main bars of the grid;

[0046] S4, see Figure 7 , set up the horizon...

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PUM

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Abstract

The invention discloses a tunnel cross-section primary lining construction process. The tunnel cross-section primary lining construction process includes steps of S1, chiseling away the lower portionsof middle partition walls according to 6m sections, inverting primary supporting concrete in secondary lining thickness ranges, cutting off the lower portions of grid main reinforcements and formingfilling portions; S2, laying waterproof layers, binding reinforcing steel bars, pouring inverted arch concrete, pouring the filling portions and forming inverted arches; S3, detaching two ends of eachmiddle partition plate in 1m ranges, detaching the primary supporting concrete in the ranges of the tops of the middle partition walls and cutting off the grid main reinforcements; S4, erecting transverse formwork supports, mounting arch centers and formworks, pouring side wall and arch concrete and forming second linings; S5, erecting temporary supports, detaching temporary remaining braces, sequentially breaking down and detaching the middle partition walls and the middle partition plates from top to bottom and from edge to center and completely detaching temporary supporting. The tunnel cross-section primary lining construction process has the advantages that the residue earth generation volumes at earlier stages can be effectively reduced, the influence degree of residue earth outwardtransport on the progress can be lowered, and secondary lining which is a critical working procedure can be constructed in an acceleration manner in advance.

Description

technical field [0001] The invention relates to a tunnel section construction process, in particular to a tunnel section initial laying construction process. Background technique [0002] The CRD construction method is widely used in the large-section construction of subway underground excavation tunnels, but this method requires a lot of time for the removal of temporary partitions and partition walls during secondary lining, and the transportation of muck. At present, the environmental protection situation in Beijing and other places is severe. Due to the smog, the transportation of muck is not allowed. The windy weather does not allow muck to be transported outside. In addition to the influence of various political activities, the export of muck is often restricted, resulting in slow construction and easy to cause idle work. [0003] During the initial construction of some tunnel sections, the height and span of scaffolding are relatively large, and the period of erectio...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/38E21D11/12E21D9/12
CPCE21D11/102E21D9/12E21D11/12E21D11/38
Inventor 张庆党利利王国平西岩东胥波高继康许铭甜郭常杰
Owner CHINA RAILWAY 12TH BUREAU GRP
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