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Large-span cross aisle building method applied to segmental lining tunnels

A horizontal channel and long-span technology, applied in tunnels, shaft linings, tunnel linings, etc., can solve the problems of being unable to be closed into a loop, affecting safety, and large spans of horizontal channels, so as to achieve low structural strength, high safety, and prevent collapse Effect

Active Publication Date: 2016-09-07
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 2. The span of the cross passage is large. If the cross passage intersects with the main tunnel at an oblique angle, the section span of the cross passage at the interface will be larger, and there will be greater risks in the construction process of the existing cross passage construction technology;
[0008] 3. The junction of the cross passage and the main tunnel cannot be closed to form a ring, and it can be temporarily stabilized when the span is small. However, the construction time of the long-span cross passage is long, and the stratum exposure cannot be closed in time to form a ring. It is easy to fall off and affect safety.

Method used

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  • Large-span cross aisle building method applied to segmental lining tunnels
  • Large-span cross aisle building method applied to segmental lining tunnels
  • Large-span cross aisle building method applied to segmental lining tunnels

Examples

Experimental program
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Embodiment

[0026] Example: such as Figure 1 to Figure 5 A method for constructing a long-span cross passage applied to a segment-lined tunnel is shown, including the following steps:

[0027] 1) Construction of the segment-lined tunnel 1, after the structure of the segment-lined tunnel 1 is stabilized and the stratum is temporarily stabilized, at the interface between the transverse channel 6 and the segment-lined tunnel 1 at both ends, the segment-lined tunnel 1 is demolished along the longitudinal direction 1 ~ 2 pieces of segment lining 2, forming a breach;

[0028] 2) Excavate the soil layer at the breach of the segment-lined tunnel 1 toward the direction of the cross passage 6, and build the initial support structure 3 of the cross passage 6 horizontally outwards on the outer edge of the breach, and then install the initial support A temporary sealing wall 5 is built vertically at the outer end of the structure 3, and the horizontal distance between the temporary sealing wall 5 an...

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PUM

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Abstract

The invention discloses a large-span cross aisle building method applied to segmental lining tunnels. A plurality of rings of tunnel linings are sequentially dismounted at the joint portions of a built large-span cross aisle in the designing direction, expanded excavation is conducted outwards every time the tunnel linings are dismounted, then primary lining structures in a closed loop in the cross section direction at the crevasses are constructed in time after expanded excavation, secondary tunnel linings of a main tunnel and the large-span cross aisle are constructed under protection of primary lining, and building safety of the joints of the large-span cross aisle is ensured.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a method for constructing large-span transverse passages applied to segment-lined tunnels. Background technique [0002] Segment lining tunnel is in the process of tunnel construction, the prefabricated segments outside the tunnel are assembled into rings in the tunnel as the lining of the tunnel. Both the circumferential and longitudinal seams between the sheets are bolted. [0003] After the segment-lined tunnel is completed, due to the requirements of use function or safety evacuation and rescue, it is necessary to build cross passages and other branch tunnels from the main tunnel. In general, the construction of the interface of the segment-lined tunnel connecting channel is to directly remove the segment lining at the interface, then excavate from the main tunnel to the transverse channel, and pour the reinforced concrete lining at the interface. [0004] The initial sup...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21F17/103E21D11/00
CPCE21D9/00E21D11/00E21F17/103
Inventor 肖明清邓朝辉龙凡游龙飞姚捷涂若霖
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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