Tunnel waterproof curtain construction precision-guided grouting method

A technology for water-stop curtains and tunnels, used in construction, infrastructure engineering, etc.

Active Publication Date: 2018-12-11
BEIJING UNIV OF TECH
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Problems solved by technology

During the construction of bored piles, the guided grouting pipe is lowered together with the reinforcement cage, and the retreating

Method used

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  • Tunnel waterproof curtain construction precision-guided grouting method
  • Tunnel waterproof curtain construction precision-guided grouting method
  • Tunnel waterproof curtain construction precision-guided grouting method

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Embodiment Construction

[0032] A precise guided grouting method for constructing a water-tight curtain in a tunnel. When driving piles along the side wall in the tunnel, the pile row drilling is performed first. The guided grouting pipe is lowered together with the reinforcement cage drilled in the row of piles, after which the concrete is poured. After the initial setting of the concrete, a water-stop curtain with an effective thickness of 0.8-1.0D is gradually formed between the piles through the guided grouting pipe from bottom to top, where D is the diameter of the pile row. Key technologies include the following three parts:

[0033] (1) Construction technology of precise guided grouting for water-stop curtain

[0034] 1) The drilling rig is positioned at the drill hole of the pile row, and the drill rig drills the design diameter drill hole at the design drill hole;

[0035] 2) After completing the drilling, connect the guide grouting pipe 2 with a diameter of 100 mm to the outer side of the ...

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Abstract

The invention discloses a tunnel waterproof curtain construction precision-guided grouting method and belongs to the technical field of underground engineering construction. The tunnel waterproof curtain construction precision-guided grouting method comprises, during side wall piling in a tunnel, firstly, forming pile removing drilled holes, of which steel reinforcement cages have a diameter 200-300 mm smaller than that of the drilled holes, deploying grouting guide pipes along with the steel reinforcement cages of the pile removing drilled holes; secondly, casting in concrete, then after theconcrete is initially set, performing segmented grouting from bottom to top via the grouting guide pipes to gradually form a waterproof curtain with an effective thickness of 0.8-1.0 D between piles.The key construction technique of the tunnel waterproof curtain construction precision-guided grouting method is composed of a construction process of precision-guided grouting of the waterproof curtain, a precision-guided grouting gun and a precision-guided grouting range computation formula. The tunnel waterproof curtain construction precision-guided grouting method saves special hole drilling for the grouting guide pipes, achieves intensive construction, is low in construction cost, rapid and convenient in construction and good in effects and integrally ensures the quality of the waterproofcurtain.

Description

technical field [0001] The invention belongs to the technical field of underground engineering construction, and mainly adopts the precise guidance grouting technology to construct in the cramped and narrow space of the tunnel to form a water-stop curtain. Background technique [0002] At present, the water-stop curtain construction method for subway underground excavation projects is usually on the ground, using methods such as high-pressure jet grouting, static pressure grouting, steel sheet piles, underground diaphragm walls, and freezing methods to make water-stop curtains. However, the problems of the high-pressure jet grouting method and the static pressure grouting method are mainly that the slurry is prone to stringing and slipping, and cannot be accurately sprayed on the designated position. The problems of steel sheet piles and underground diaphragm walls are mainly that it is inconvenient to construct in the cramped and narrow space in the tunnel, and the construc...

Claims

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Application Information

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IPC IPC(8): E02D19/18E02D15/04
CPCE02D15/04E02D19/18
Inventor 姚爱军郭海峰张志红李立云卢健周一君郭彦非
Owner BEIJING UNIV OF TECH
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