Method for constructing head-expanded anchoring rod in sand-rich decomposed rock

A construction method and technology of weathered rock, which is applied in the direction of foundation structure engineering, building, sheet pile wall, etc., can solve problems such as collapsed holes, encountering boulders, difficulty in anchoring, etc., achieving remarkable results and cost-saving effects

Inactive Publication Date: 2014-01-22
CHINA CONSTR EIGHT ENG DIV CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the construction of the expansion head bolt, solve the problems such as hole collapse, difficulty in anchoring, and boulders encountered in high-pressure rotary jet drilling in sand-rich geology

Method used

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  • Method for constructing head-expanded anchoring rod in sand-rich decomposed rock
  • Method for constructing head-expanded anchoring rod in sand-rich decomposed rock
  • Method for constructing head-expanded anchoring rod in sand-rich decomposed rock

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] refer to Figure 1 to Figure 11 As shown, the invention discloses a construction method for a high-pressure rotary grouting expansion head bolt in sand-rich weathered rock, and the sequence of each drawing corresponds to a step of the method.

[0038] Such as figure 1 , the first step: install the recyclable wall steel casing 2 to the outside of the drill pipe 1 of the down-the-hole drill, the drill pipe 1 starts drilling downward in the wall steel casing 2, and the drill bit of the drill hole 1 touches the surface first , to prevent unnecessary wear of the casing 2.

[0039] Such as figure 2 , the second step: the retaining wall steel casing 2 sinks together with the drill pipe 1 until the top of the arm protection steel casing 2 completely sinks into the ground surface, at this time, stop the drill pipe 1 and the arm prot...

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Abstract

The invention relates to a method for constructing a head-expanded anchoring rod in sand-rich decomposed rock. The method achieves the aim that under the condition that engineering geology is complex, a steel sleeve wall retaining method, a common rock anchoring rod method and a jet grouting hole expanding method are used at the same time to achieve the aim of secondary cement paste hole cleaning. The method is the pertinence technological improvement for construction in the special geology of the sand-rich decomposed rock, and solves the problems of hole collapse, difficult anchorage, boulder facing and the like of the head-expanded anchoring rod in the sand-rich geology, the bearing capacity is greatly improved, the construction cost is saved, and the economical benefits are considerable. The method has the advantages of being innovative, practical and remarkable in effect, and enabling multiple practical and simple processing methods to be matched with each other to adapt to construction of the head-expanded anchoring rod in the special environment.

Description

technical field [0001] The invention relates to an excavation construction method for a bolt, in particular to a construction method for a high-pressure rotary spraying expanding head bolt in sand-rich weathered rock. Background technique [0002] Anchor force: the bonding force between the anchored part of the anchor rod and the rock mass. The anchoring force is an important index of working characteristics of the soil anchor structure, and it is also the maximum bearing capacity of the anchor rod. Further improving the anchoring force has become a hot topic in the construction industry at present. The drilling method used in the previous common bolt has defects such as low pull-out force and impact on the environment. Therefore, people put forward the technology of soil anchor rod with enlarged end, which is an effective means to improve the anchoring force, and has been paid more and more attention by people. What is particularly prominent is that the high-pressure inj...

Claims

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Application Information

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IPC IPC(8): E02D5/74
Inventor 苏亚武曹定生王大迎李金生李昭王朝龙潘鹏飞
Owner CHINA CONSTR EIGHT ENG DIV CORP LTD
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