Ultra-shallow buried tunnel cover-excavation construction method

A construction method and tunnel technology are applied in the field of tunnel excavation construction and super-shallow buried tunnel cover excavation construction to achieve the effect of shortening road time, avoiding the risk of third-party loss and avoiding the risk of collapse.

Active Publication Date: 2015-03-25
NO 3 ENG LIMITED OF CR20G
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  • Abstract
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  • Application Information

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Problems solved by technology

The cover-and-dig construction method can be divided into two types: the cover-and-dig method a

Method used

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  • Ultra-shallow buried tunnel cover-excavation construction method
  • Ultra-shallow buried tunnel cover-excavation construction method
  • Ultra-shallow buried tunnel cover-excavation construction method

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with embodiment and accompanying drawing: and present embodiment can not be used for limiting the present invention:

[0022] a. Ease road traffic; do a good job of ground (1) enclosure, close the proposed construction area, and minimize the impact on road traffic and the environment;

[0023] b. Carry out the surrounding protection pile (2) operation on both sides of the underground project to be implemented; according to the geological conditions, the surrounding protection pile (2) adopts rotary drilling or manual digging operation, and pours pile foundation concrete;

[0024] c. Construction of transverse load-bearing beams (4) and longitudinal load-bearing beams (3) and structural roof (5) on the top of the pile foundation: after the pile foundation concrete reaches the design strength, excavate the horizontal load-bearing beams (4) and longitudinal load-bearing beams Beam (3) foundation...

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Abstract

The invention discloses an ultra-shallow buried tunnel cover-excavation construction method. According to the technical scheme, first, ground transportation for construction is evacuated; fender pile operation is performed on the two sides of an underground project to be implemented; a load-bearing beam and a structural top plate are manufactured on the top of a pile foundation, and then road surface traffic is restored; the position below the structural top plate is excavated to reach the elevation of a structural bottom in a three-step excavation mode, and soil supports between fender piles are constructed at the same time; a cushion layer and a bottom waterproof layer are reinforced; the major structure and the remaining waterproof layer of the underground project are implemented; sand is blown back so that a gap between a cover plate and the major structure can be backfilled with the sand. Compared with the prior art, the time for occupying a road because of construction is shortened, and influences on the external environment of construction are small; the horizontal displacement of the structure is small; the structural plate is used for excavation of a foundation pit so that a temporary support can be omitted; influences caused by external weather are small; the collapse risk of the ultra-shallow section underground project and the loss risk of a third party are avoided.

Description

technical field [0001] The invention relates to a tunnel excavation construction method, in particular to an ultra-shallow tunnel cover-excavation construction method for passing through urban main roads or busy traffic areas, and belongs to the field of road and bridge engineering construction. Background technique [0002] With the rapid development of urban subways, the difficulty of underground excavation projects is increasing. The thicker the covering layer on the top of the excavation, the more conducive to the construction of underground excavation, and the smaller the safety risk. The thinner the covering layer, the greater the safety risk. If the ratio of the actual measured earth pressure P to the vertical soil column rh is greater than or equal to 0.6 in the ultra-shallow backfill soil layer, and the ground traffic is heavy, no matter how advanced the pre-reinforcement is in the underground engineering construction, it is not allowed during the excavation process....

Claims

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Application Information

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IPC IPC(8): E02D29/045
CPCE02D29/045
Inventor 程宏军封军华庄乾理李光军林昌贵杨利军车轶华李锴男宋小军张沱
Owner NO 3 ENG LIMITED OF CR20G
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