Construction method of pre-stressed anchor cable for strong unloading fractured rock mass
A technology of prestressed anchor cable and construction method, which is applied in basic structure engineering, construction, sheet pile wall and other directions, can solve the problems of string grouting, grouting quality of anchoring section and difficulty in ensuring the prestress of anchor cable, etc., so as to ensure construction quality, reducing cement consumption and reducing construction costs
Inactive Publication Date: 2020-11-17
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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Problems solved by technology
However, when grouting the tension section, the mortar may enter the anchor section along the rock crevices, resulting in grouting, which makes it difficult to guarantee the grouting quality of the anchor section and the prestress of the anchor cable in the later stage.
Method used
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[0034] The technical solution of the present invention is further described below, but the scope of protection is not limited to the description.
[0035] Such as Figure 1 to Figure 3 As shown, a kind of strong unloading broken rock mass prestressed anchor cable construction method of the present invention comprises the following steps:
[0036] A. Drilling the anchor cable hole: After the drilling rig is in place, the anchor cable hole is formed by following the pipe, fixing the wall and grouting as required.
[0037] B. Manufacture and installation of the anchor cable body: prepare the anchor cable body, place the anchor cable body straightly in the center of the anchor cable hole, and install the steel pipe assembly at the opening of the anchor cable hole. One end extending into the anchor cable hole on the anchor cable body is provided with a guide cap 1 .
[0038] C. Grouting: grouting to the anchoring section and the tensioning section in sequence, and the steel pipe ...
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The invention discloses a construction method of a pre-stressed anchor cable for strong unloading fractured rock mass, and belongs to the technical field of pre-stressed anchor cable construction forrock mass reinforcement. The method comprises the following steps of anchor cable hole drilling, anchor cable body manufacturing and mounting, grouting, anchorage pier construction, anchor cable bodylocking and supplementary grouting anchor sealing. An anchor cable hole is formed in pipe-following hole forming, wall-fixing hole forming and on-demand grouting modes, so that the problems that underthe geological condition of the strong unloading fractured rock mass, hole walls are prone to collapse during hole forming, hole forming air leakage occurs, and grouting leakage is serious are solved, the grouting quality is favorably guaranteed, and the prestress of the anchor cable is kept; and in the processes of wall fixing and hole forming and on-demand grouting, pre-grouting is carried outon the hole wall of the anchor cable hole, so that grout leaking during grouting of a tensioning section and a anchoring section is avoided, the grouting quality of the anchoring section is favorablyguaranteed, and the prestress of the anchor cable is kept.
Description
technical field [0001] The invention relates to a construction method of a prestressed anchor cable for strong unloading broken rock mass, and belongs to the technical field of prestressed anchor cable construction for rock mass reinforcement. Background technique [0002] Strong unloading broken rock mass is a geological condition that is often encountered in water conservancy, highway, and railway projects. Its characteristics mainly include the following aspects: ① loose, cracks developed, broken and loose, and the hole wall is easy to collapse when making holes. Drill sticking; ②Hard, compared with the general loose and fractured formation, the rock hardness is higher, and the drilling tool wear is greater; ③Leakage, the degree of unloading of the slope is deep, the cracks are widely developed, there are connections, air leakage in hole making, and leakage of grouting Serious; ④ sandwiched, there are multiple faults in the subdivision, and the formation is obviously soft...
Claims
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Login to View More IPC IPC(8): E02D5/76E02D15/04
CPCE02D5/76E02D15/04
Inventor 张栋张伟王旭辉梁政李波宋思谕
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD