Grouting method for avoiding perforating steel lining
A technology of steel lining and grouting holes, which is applied in wellbore lining, tunnel lining, earthwork drilling and mining, etc. It can solve problems affecting the strength and integrity of steel lining, steel plate damage, time-consuming and labor-intensive problems, and reduce structural leakage and structural damage. The possibility of maintaining structural integrity and the effect of ensuring structural strength
Active Publication Date: 2012-10-31
POWERCHINA HUADONG ENG COPORATION LTD
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Problems solved by technology
[0003] Steel lining is the most important water-blocking and stress-bearing structure of high-pressure pipelines. Grouting the holes is not only time-consuming and labor-intensive, but also the opening of the steel lining itself will affect the strength and integrity of the steel lining. The quality of the welds is not easy to guarantee, and there is some leakage. possibility, the surrounding rock consolidation grouting construction process after opening may also cause other damage to the steel plate
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[0014] Such as figure 1 As shown, in this embodiment, after the excavation of tunnel 1, the surrounding rock in some sections of the tunnel is seriously loose, which affects the bearing capacity of the surrounding rock. Therefore, the above-mentioned tunnel sections are consolidated and grouted to improve the elastic resistance coefficient of the surrounding rock and improve the bearing capacity of the surrounding rock. The grouting method is as follows:
[0015] a. Excavate the tunnel at a section of the tunnel 1 to form a circular cylindrical expansion excavation section 3 with a depth of 2-4m and a length of 4-6m (the specific size can be determined according to the scale of the project). Such as figure 1 , figure 2 As shown, a group of grouting holes 4 are drilled at the section 3-1 of the expansion excavation section 3 on the upper and lower sides of the tunnel. The original design excavation edge distance can be determined according to the slurry diffusion radius;
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The invention relates to a grouting method for avoiding perforating a steel lining, which is used for solving the technical problems that the integrality and strength of the steel lining are ensured and the possibilities of structural leakage and structural damage are reduced on the premise of reinforcing surrounding rocks and improving the bearing capacity of the surrounding rocks. The technical scheme for solving the problems is as follows: grouting can be completed by expansive excavation of a tunnel without perforating the steel lining. The grouting method can be applied to consolidation grouting of the surrounding rocks of the tunnel in water conservancy and hydropower engineering.
Description
technical field [0001] The invention relates to a grouting method for avoiding steel lining opening, which is suitable for the consolidation grouting treatment of tunnel surrounding rock in water conservancy and hydropower projects. Background technique [0002] In areas with high ground stress, the surrounding rock relaxes seriously after tunnel excavation, which affects the bearing capacity of the surrounding rock and increases the risk of steel lining stress exceeding the limit. surrounding rock bearing capacity. Since bare rock consolidation grouting has a better effect on improving the elastic resistance of surrounding rock with severe surface relaxation, steel lining opening grouting is generally selected in actual engineering. [0003] Steel lining is the most important water-blocking and stress-bearing structure of high-pressure pipelines. Grouting the holes is not only time-consuming and labor-intensive, but also the opening of the steel lining itself will affect t...
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IPC IPC(8): E21D11/10
Inventor 房敏敏吴旭敏侯靖
Owner POWERCHINA HUADONG ENG COPORATION LTD