High-pressure bifurcated pipe excavation method
A bifurcated pipe and high pressure technology, which is used in the field of bifurcated pipe excavation under high water head, can solve the problems of falling blocks, unfavorable surrounding rock stability, structural formation, relaxation and collapse, etc., so as to ensure the quality of excavation and reduce the The effect of blasting vibration and structural stress concentration, the effect of ensuring the stability of surrounding rock and the quality of excavation
Active Publication Date: 2020-06-05
SINOHYDRO BUREAU 7 CO LTD
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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.
Method used
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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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Abstract
The invention discloses a high-pressure bifurcated pipe excavation method. According to a high-pressure bifurcated pipe design structure, bifurcated pipe excavation is sequentially divided into bifurcated pipe excavation, branch pipe locking notch support and branch pipe excavation; the bifurcated pipe and branch pipe excavation comprises middle excavation, protecting layer excavation and bottom board excavation. According to the method, the bifurcated pipe and branch pipe excavation comprises middle excavation, protecting layer excavation and bottom board excavation, so that crustal stress can be effectively released, the protecting layer excavation produces small damage to rock, and adjoining rock stability and excavation forming quality are ensured; a locking notch anchor rod is arranged at the joint of the bifurcated pipe and branch pipe, rock mass anchoring of the part is completed in advance, influence of vibration of blasting and concentration of structural stress is reduced, and the adjoining rock stability and excavation forming quality are ensured; and according to the protecting layer excavation, by means of one-by-one lofting for peripheral holes and alternate lofting in the rearview direction, the problem of large offset of hole sites and drilling angles of the peripheral holes can be effectively solved, and the high-pressure bifurcated pipe excavation forming quality is improved.
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...
Claims
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Patent Timeline
Login to View More 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 SINOHYDRO BUREAU 7 CO LTD