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Method for compounding anchor rod by geotextile reinforcing

A composite bolt and geotextile technology, applied in the field of engineering, can solve the problems of slurry loss, difficult to form anchors, and difficult to anchor, and achieve the effect of improving the pullout resistance of the bolt, reducing construction costs and saving cement.

Active Publication Date: 2011-08-31
WUHAN SURVEYING GEOTECHN RES INST OF MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the rock mass is broken, the cracks are strongly developed, and the groundwater is abundant, the traditional compaction grouting method has the following problems: 1) The grout is lost along the cracks and fissures of the broken rock mass, and it is difficult to form a complete anchor; 2) The grout in the area with rich groundwater Washed away by groundwater, it is difficult to form an anchor

Method used

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  • Method for compounding anchor rod by geotextile reinforcing
  • Method for compounding anchor rod by geotextile reinforcing
  • Method for compounding anchor rod by geotextile reinforcing

Examples

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Effect test

Embodiment 1

[0017] Practical cases in 2# and 3# landslide control projects of Yangchun New Iron and Steel Co., Ltd.

[0018] according to Figure 1-4 Shown, a kind of geotextile reinforced composite anchor method, its steps are as follows:

[0019] ① Hole forming: use YG-60 bolter drilling rig, adopt down-the-hole hammer eccentric follow pipe drilling process to form holes; after reaching the design hole depth of 20m, take out the drill pipe and evacuate the drilling rig;

[0020] ②Anchor rod production: The anchor rod uses 5 bundles of f ptk = 1860MPa high-strength low-relaxation unbonded steel strand, the total length of the anchor body is 21.0m, and the length of the anchor section is 8.0m; the free section of the anchor is separated from the anchor section by a sealed bag, and the anchor section is installed bag geotextile;

[0021] ③Anchor installation: place the prepared geotextile composite anchor in the borehole, and pull out the follow-up casing;

[0022] ④ Grouting: First, g...

Embodiment 2

[0026] Practical case of Yangchun New Iron and Steel's manual unloading trough and double dumper system for deep foundation pit support

[0027] according to Figure 1-4 Shown, a kind of geotextile reinforced composite anchor method, its steps are as follows:

[0028] ① Hole forming: use MD-60A bolter drilling rig, and use the down-the-hole hammer concentric drilling process to form holes; after reaching the design hole depth of 28m, take out the drill pipe and evacuate the drilling rig;

[0029] ②Anchor rod production: the anchor rod adopts 4 beams f ptk =1860MPa high-strength low-relaxation unbonded steel strand, the total length of the anchor rod body is 28.0m, and the length of the anchoring section is 16.0m; bag-type geotextiles are installed in the anchoring section;

[0030] ③Anchor installation: place the prepared geotextile composite anchor in the borehole, and pull out the follower pipe;

[0031] ④ Grouting: Control the grouting pressure at 1.0MPa and the slurry f...

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Abstract

The invention discloses a method for compounding an anchor rod by geotextile reinforcing, comprising the following steps: (1) drilling to form a hole; (2) manufacturing an anchor rod; (3) placing the anchor rod; (4) grouting; (5) stopping grouting; and (6) finishing grouting. The method has the advantages of solving two problems of anchoring and grouting in loose deposits and broken stratums. According to the method, a great quantity of cement can be saved, and the construction cost is lowered; a full anchoring body is formed by the ballooning effect of the geotextile; the uplift resistance of the anchor rod can be improved by the reinforcing performance of the geotextile; according to the practical situations in the Yangchun New Steel No.2 and 3 landslide management projects, the artificial unloading slot and double turnover system foundation pit support projects and the like of the Yangchun New Steel, the anchoring and grouting amount is about 5-10% of the common grouting amount; and the anchor rod uplift resistance can be improved by 1.5 times by the destructive anchor rod tension test.

Description

technical field [0001] The invention relates to the technical field of engineering, in particular to a geotextile-reinforced composite anchor method. Background technique [0002] There are deficiencies in the subject research and construction technology of anchor grouting in loose accumulation bodies and broken rock and soil strata. At present, the anchoring grouting in loose accumulation bodies and broken strata mainly adopts the compaction grouting method, and the anchoring section and the free end are grouted through the grouting pipe pre-buried on the rod body. Because the rock mass is broken, the cracks are strongly developed, and the groundwater is abundant, the traditional compaction grouting method has the following problems: 1) The grout is lost along the cracks and fissures of the broken rock mass, and it is difficult to form a complete anchor; 2) The grout in the area with rich groundwater Washed away by groundwater, it is difficult to form an anchor. Contents...

Claims

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Application Information

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IPC IPC(8): E02D3/12E02D5/74
Inventor 王超雄张艳军肖玉成张荣
Owner WUHAN SURVEYING GEOTECHN RES INST OF MCC
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