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Construction method of deep burying center ditch for tunnel in extremely cold region

A central water ditch and construction method technology, applied in tunnels, tunnel linings, drainage and other directions, can solve the problems of difficult construction organization, slow construction progress, and large disturbance of surrounding rock, so as to shorten the blasting throwing distance, ensure construction quality, shorten the The effect of the construction period

Active Publication Date: 2017-09-26
CHINA RAILWAY NO 5 ENG GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to provide a construction method for deep-buried central ditch in severe cold regions, which adopts simple inverted arch trestle + self-propelled inverted arch trestle to advance construction in parallel, effectively solving the construction organization difficulties existing in the prior art , low work efficiency, slow construction progress, high cost, and large disturbance to surrounding rock

Method used

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  • Construction method of deep burying center ditch for tunnel in extremely cold region
  • Construction method of deep burying center ditch for tunnel in extremely cold region
  • Construction method of deep burying center ditch for tunnel in extremely cold region

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specific Embodiment approach

[0032] The specific embodiment of the present invention: a deep buried center ditch of a tunnel in a severe cold area adopts nine steps (see figure 2 ) (nine steps) for construction. Before construction, excavate the working face to the top of the inverted arch, and then use the simple inverted arch trestle and self-propelled inverted arch trestle to carry out the deep-buried central ditch and the inverted arch framing operation (see figure 1 ), including the following steps:

[0033] Step 1. Excavation and blasting: use hole-controlled blasting construction (see image 3 ), vertical deep hole blasting, layered blasting excavation, water ditch blastholes are all inclined to the outside of the hole, and the unit consumption of explosives is 0.6kg / m 3 Control, the blasting area is 4.4m 2 . For each cycle of 4m, the excavation dosage is 11.56kg. Charge 0.15kg in a single hole on both sides, and charge 1.2kg in a single hole in two rows of holes in the middle.

[0034] Step ...

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Abstract

The invention discloses a construction method of a deep burying center ditch for a tunnel in an extremely cold region; before construction of an inverted arch of the tunnel, advanced construction is performed on the deep burying center ditch via a simple inverted-arch trestle, and then the inverted arch is constructed via a mobile inverted-arch trestle; the method comprises the specific steps of I, controlling blasting construction via boreholes, vertically distributing boreholes to perform deep-hole blasting, excavating by deck blasting, wherein all ditch blastholes incline out of the tunnel; II, excavating a ditch with a small excavator to a designed elevation; III, clearing ditch false dregs and ponding; IV, constructing a foundation; V, burying and installing a culvert; VI, performing graded backfilling; VII, casting thermal insulation concrete; VIII, tiling insulation plates. The problems of the prior art are effectively solved, such as difficulty in construction organization, low working efficiency, slow construction progress, high cost, and great disturbances to surrounding rock, and good service effect is achieved.

Description

technical field [0001] The invention relates to a construction method for a deep-buried central drainage ditch of a tunnel in a severe cold region, in particular to a construction method for a deep-buried central drainage ditch of a tunnel in a severe cold region. Background technique [0002] For tunnels in extremely cold regions, the maximum freezing depth of the soil is about 2.0m. Mainly considering the requirements of antifreeze and heat preservation, the central ditch is deeply buried. In traditional construction, the construction team often fills the surface from the inverted arch to reduce the construction process and shorten the cycle time. One-time excavation to the bottom of the deep-buried central ditch, due to the high excavation depth at one time, resulted in serious over-excavation of the inverted arch, and the construction of the deep-buried central ditch needs to be backfilled in time before the tunnel face operation can be carried out. The impact is relativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21F16/02E21D11/18
CPCE21D11/102E21D11/18E21F16/02Y02E10/20
Inventor 张健刘林刘语申剑刘玉府许锡甲王志强吴秀雄朱东平王九华蒋志权解振乙王开荣谭奔
Owner CHINA RAILWAY NO 5 ENG GRP
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