Construction Method of Long-span Cross-Aisle Applied to Segment-Lined Tunnel

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...

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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.

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