A method for excavating high-pressure bifurcated pipes
A bifurcated pipe and high pressure technology is applied in the field of bifurcated pipe excavation construction under high water head, which can solve the problems of unfavorable surrounding rock stability and structural forming, slack and collapse, and piece help drop blocks, etc., to ensure the quality of the intersection excavation and forming. , The effect of small damage to the rock mass and ensuring the integrity of the rock mass
Active Publication Date: 2021-09-28
中国水利水电第七工程局有限公司
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Problems solved by technology
Multiple excavation and blasting vibrations of bifurcation pipes and branch pipes, and the influence of high ground stress lead to stress concentration and relaxation damage at the junction of bifurcation pipes and branch pipes.
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[0025] The present invention is further described below in conjunction with specific embodiment, and specific embodiment is the further description of the principle of the present invention, does not limit the present invention in any way, and the identical or similar technology of the present invention all does not exceed the scope of protection of the present invention.
[0026] In conjunction with the accompanying drawings.
[0027] Excavation of the high-pressure bifurcation pipe The middle part of the bifurcation pipe, the protective layer of the bifurcation pipe, the excavation of the bottom plate of the bifurcation pipe and the excavation of the junction of the bifurcation and branch pipes. The excavation in the middle part is 2.0m above the design excavation floor and 1.5-2.0m away from the design excavation line, see figure 1 Part B in the middle; the protection is within the range of 1.5-2.0m outside the middle part, see figure 1 Middle part A; the bottom plate is t...
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The invention discloses a construction method for excavating a high-pressure bifurcated pipe. According to the design structure of the high-pressure branch pipe, the excavation of the branch pipe is divided into branch pipe excavation, branch pipe lock support and branch pipe excavation; the branch pipe and branch pipe excavation include central excavation, protective layer excavation and floor excavation. Excavation in the middle of branch pipes and branch pipes, excavation of the protective layer, and excavation of the floor can effectively release the ground stress and the excavation of the protective layer has little damage to the rock mass, ensuring the stability of the surrounding rock and the quality of the excavation; Lock anchor rods are set at the junction of branch pipes to complete the anchorage of the rock mass in advance, reduce the impact of blasting vibration and structural stress concentration, and ensure the stability of surrounding rock and the quality of excavation; The backsight direction can effectively solve the problem of large deviations in the surrounding hole positions and drilling angles, and ensure the quality of high-pressure bifurcated pipe excavation.
Description
technical field [0001] The invention belongs to the technical field of hydropower and water conservancy engineering, in particular to the technical field of branch pipe excavation in underground caverns, and specifically relates to a construction method for branch pipe excavation under high water head. Background technique [0002] The high-pressure branch pipe is an important part of the water transmission and power generation system, which mainly bears the internal and external water pressure and transmits the internal water pressure to the surrounding rock mass. The internal and external water permeability coefficients mainly depend on the integrity of the rock mass. Improving the excavation quality of high-pressure bifurcated pipes can reduce the amount of subsequent high-pressure grouting works, reduce the project cost, and increase the stability of the cavern. [0003] The excavation construction of high-pressure bifurcated pipes is required to meet the conditions of s...
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IPC IPC(8): E21D9/00E21D9/14E21D20/02E21D21/00
CPCE21D9/006E21D9/14E21D20/02E21D21/0026
Inventor 宋安瑞王强刘振庚王峻李勇袁胜利郑尧李旭东林金威侯望杨小双
Owner 中国水利水电第七工程局有限公司