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Primary support method for new caverns

A technology for initial support and cavern, which is used in earthwork drilling, underground chambers, shaft equipment, etc., can solve problems such as voids, and achieve the effects of reducing loose circles, protecting surrounding rocks, and easy installation.

Active Publication Date: 2018-09-28
CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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Problems solved by technology

[0022] The technical problem to be solved by the present invention is to provide a method that can restrain the excessive deformation of the surrounding rock in time, solve the problem of the steel frame being empty after spraying concrete, save the amount of support, save investment, and can avoid the safety risks of the original support technology. The initial support method of the new cavern

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  • Primary support method for new caverns
  • Primary support method for new caverns
  • Primary support method for new caverns

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with accompanying drawing.

[0054] Such as figure 1 As shown, in order to solve the problems of the technologies described above, the initial support method of the newly-built cavern that the present invention adopts comprises the following steps:

[0055] 1. The initial support method for a new cavern is characterized in that it includes the following steps:

[0056] a. Before the excavation of the cavern, drill a hole for longitudinal reinforcement along the excavation contour surface of the cavern and ahead of the tunnel face;

[0057] b. Cut the material at the installation site of the steel bar and make it into the steel bar of the actual required length;

[0058] c. Insert 3 to 5 sections of wetted anchoring agent into the reinforcement hole;

[0059] d. Insert the advanced longitudinal reinforcement along the drilled reinforcement hole;

[0060] e. The exposed part of the steel bar is bound...

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Abstract

The invention relates to an incipient support method of a newly built tunnel, in particular to the incipient support method of the newly built tunnel applied to the field of supporting engineering under a geological condition of poor surrounding rock. The invention provides the incipient support method of the newly built tunnel which can restrain an oversized and distortional surrounding rock ahead and in time, reduce tunnel overbreak quantity, prevent safety risks of disengagement, reduce supporting amount and save investment. The method comprises the steps of a, arranging vertical steel bar holes along a tunnel excavation contour surface; b, steel bar blanking; c, cramming an anchoring agent; d, inserting vertical steel bars; e, connecting and fixing external exposed parts of the steel bars; f, excavating the tunnel; g, removing dangers; h, incipient concrete spraying support; i, supporting construction system anchor bolt; j, installing annular steel bars; k, installing steel frames; l, respraying concrete. The incipient support method of the newly built tunnel can restrain an oversized and distortional tunnel, reduce tunnel overbreak quantity, reduce steel frame support amount, reduce spray layer thickness, reduce incipient support time and reduce safety risks.

Description

technical field [0001] The invention relates to an initial support method for a newly built cavern, in particular to an initial support method for a newly built cavern in the field of support engineering under poor geological conditions of surrounding rocks. Poor surrounding rocks refer to surrounding rocks of grade III, grade IV and grade VI. Background technique [0002] Existing new traffic tunnels and other underground caverns require initial support after excavation, especially in areas with poor surrounding rock that need to be supported by steel frames (grid steel frames or section steel frames). The existing "Code for Design of Highway Tunnels" (JTG D70-2004) specifies the design parameters for the composite lining of two-lane tunnels and three-lane tunnels. But existing technology has following shortcoming: [0003] 1. The existing steel frame cannot adapt to the excavation profile of the cavern [0004] Due to the differences in the development of rock (soil) jo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10
CPCE21D11/107
Inventor 吴学智傅支黔聂大丰青华彬
Owner CHINA HYDROELECTRIC ENGINEERING CONSULTING GROUP CHENGDU RESEARCH HYDROELECTRIC INVESTIGATION DESIGN AND INSTITUTE
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