Construction method of fully pouring tunnel invert

A construction method and technology for tunnels, which are applied to tunnels, tunnel linings, earth-moving drilling, etc., can solve the problems of unsatisfactory construction quality, high construction cost, slow construction speed, etc., to improve construction standards and low construction costs. , the effect of reducing waste

Active Publication Date: 2013-03-27
CHINA RAILWAY 12TH BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of slow construction speed, high construction cost and unsatisfactory construction quality in the

Method used

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  • Construction method of fully pouring tunnel invert
  • Construction method of fully pouring tunnel invert
  • Construction method of fully pouring tunnel invert

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] Example 1: Dongnanzhang Tunnel of Daxi Passenger Dedicated Line

[0038] 1. Project overview

[0039] Southeast Zhang Tunnel is designed as a single-hole double-lane tunnel, with the entrance mileage changed to DK582+340 and the exit mileage changed to DK582+735, with a total length of 2395m. The tunnel site area is a loess plateau landform with well-developed gullies and large terrain fluctuations. Most of the mountain is covered by loess, and the valleys are deeply cut. From the entrance to DK583+332.3, the left deviation curve R=7000m, from DK583+332.3 to DK583+943.8 is on the straight line, from DK583+943.8 to the exit, the curve R=7000m, and from the entrance to the exit is an uphill slope of 18.4‰. The surrounding rock in the cave is Tertiary Neogene fine sand: light brownish-yellow, slightly wet, dense, compacted, and unevenly cemented; silty clay, brown-red hard to hard plastic, poorly bonded between the sand layer and the silty clay, The roof is easy to fall...

example 2

[0044] Example 2: Entrance of Qianqing Tunnel of Daxi Passenger Dedicated Line

[0045] 1. Project overview

[0046] Qianqing Tunnel is a single-hole double-track tunnel with a line spacing of 5m. The entrance mileage of the tunnel is changed to DK586+051, and the exit mileage is changed to DK592+744, with a total length of 6693m. The tunnel entrance to the tunnel body change DK588+709.932 is located on the right deviation curve with a radius of 7000; the tunnel body change DK588+709.923 to the tunnel body change DK590+931.3 is located on a straight line; On the right deviation curve, the tunnel is 6‰ uphill from the entrance to DK586+900, and 10.6‰ from DK586+900 to the exit. The surrounding rocks of the cave body are intricate, including old loess layer, old loess sand layer, silty sand layer, water-rich sand layer, and old loess sand layer.

[0047] 2. Construction situation

[0048] The entrance of Qianqing Tunnel began to use this method for inverted arch construction...

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Abstract

The invention relates to the field of construction of a tunnel invert, particularly relates to a construction method of fully pouring a tunnel invert, and solves the problems that the construction speed is low, the construction cost is high, and the construction quality does not achieve the requirements in the prior art. The construction method comprises the steps of measuring and lofting before excavating the tunnel invert, excavating the tunnel invert, preliminarily bracing the tunnel invert, primarily spraying concrete, and lofting an inverted arch steel locating bar; marking out a top elevation line of a small wall of the tunnel invert on a primary bracing surface of a lower bench, exerting force on inner and outer inverted rebars, and mounting a center concrete drainage pipe; mounting a set-shaped steel formwork at the tip of the tunnel invert; mounting a buried rubber water stop of a girth joint; mounting a longitudinal steel-edged water stop of the small wall of the tunnel invert; and pouring inverted arch concrete to construct by a slide chute, filling concrete into the tunnel invert to pour and finish the surface, circulating the procedures, and finishing the entire tunnel invert pouring construction. The construction method is low in construction cost, high in construction speed and strong in pertinence; the construction standard is improved; the construction quality is guaranteed; and the reference function is provided for specified construction of the tunnel invert of the domestic large cross-section passenger-dedicated tunnel at present.

Description

technical field [0001] The invention relates to the field of tunnel inverted arch construction, in particular to a method for integral pouring construction of tunnel inverted arches. Background technique [0002] Tunnel inverted arch refers to the support under the tunnel pavement. Inverted arch construction is generally poured first in the tunnel lining. After the inverted arch is poured, the arch wall formwork trolley can be positioned and supported on the inverted arch concrete, so that the tunnel arch wall concrete pouring. [0003] At present, with the rapid development of tunnel construction and the formulation of new standards, the interlayer spacing of steel bars in the past inverted arch construction does not meet the design requirements, the protective layer of steel bars is too large or too small, the length of the ribs reserved at the end of the inverted arch and the circumferential direction The design spacing does not meet the design requirements, the buried r...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/38
Inventor 李建军张志军吕亚杰郑捷梁胜国李新涛李旭峰
Owner CHINA RAILWAY 12TH BUREAU GRP
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