Hole-forming method and application of grouting hole-by-hole drilling in advanced tube shed of pebble-accumulated layer tunnel

A technology of accumulating layers and pipe sheds, which is applied in the direction of tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of drill sticking, easy hole collapse, and difficulty in hole formation, so as to achieve the effect of reinforcement, guarantee of construction quality, and good effect. Effect

CN108104840BActive Publication Date: 2019-09-06CHINA TIESIJU CIVIL ENG GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-09-06

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Abstract

The invention discloses a one-by-one drilling empty hole grouting hole forming method and application for an advance pipe shed in a pebble accumulation layer tunnel. Pipe shed hole positions close toone another are organized into one group, drilling is conducted on a hole position in the middle of the group of pipe shed hole positions firstly, when drilling cannot be conducted because problems ofhole collapse, drill bit blocking or air leakage occur, empty hole grouting is conducted on a hole-formed section by utilizing a grouting pipe, the hole bottom of the hole-formed section and surrounding rocks around the hole wall are solidified, thus first-time drilling is completed, and first-time drilling of adjacent hole positions is completed one by one by adopting the same mode; and second-time drilling of each hole position is completed one by one by adopting the mode being the same as the first-time drilling till a hole is drilled to reach a designed depth. The one-by-one drilling empty hole grouting hole forming method can ensure the pipe shed construction quality of advance supporting of the pipe shed in a pebble stratum, and the construction process is simplified.
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Description

technical field

[0001] The invention relates to a construction method for an advanced pipe shed in a pebble accumulation layer tunnel. Background technique

[0002] The advance pipe shed support construction of the pebble accumulation layer tunnel is a difficult problem in tunnel construction. The traditional advance pipe shed construction uses down-the-hole drilling to form holes. It is difficult to form holes in the pebble accumulation layer, especially when the length of the pipe shed is more than 10m When it is used, it is very easy to have problems such as hole collapse, drill sticking, and failure to drill due to air leakage; the method of surface grouting needs to consume a lot of cement, and the grouting effect is difficult to guarantee. The construction period is long and the environment is polluted. It is still very easy to cause collapse Holes, stuck drills, unable to drill holes due to air leakage, etc.; the use of full-section grouting is costly, the constructio...

Examples

Embodiment Construction

[0025] In this embodiment, the method of drilling holes one by one in the advanced pipe shed of the pebble accumulation layer tunnel and grouting is to group the holes of similar pipe sheds into a group, and firstly drill the holes in the middle of a group of pipe shed holes , when there is a problem of hole collapse, drill sticking or air leakage in the drilled hole and it is impossible to drill, use the grouting pipe to carry out hollow hole grouting for the formed hole section, and consolidate the hole bottom and the surrounding rock around the hole wall of the formed hole section , complete the first drilling, and complete the first drilling one by one for the adjacent holes in the same way; then, complete the second drilling of each hole one by one in the same way as the first drilling, until Drill the hole to the design depth.

[0026] In the specific implementation, cement water glass double grout is used as the grout for hole grouting, and the grouting pressure is 2.5M...