A pin timbering process and sectionalized hollow mud injecting stay bolt thereof

Abstract

The present invention is anchor support method and one kind of sectional hollow grouted anchor and has the features of first early strengthening locking and then grouting protection and prestressing. The sectional hollow grouted anchor consists of two sections including front solid rod and back hollow rod connected via connecting sleeve, the connecting sleeve has mortar blocking unit and hollow rod section has several centralizing units. There are side hole canal in the joint of the connecting sleeve and the hollow rod and hole canal in the support cushion for some pipe to pass through. The said anchor support method of the present invention is used for temporary and permanent fast support in both hard and weak rock formation conditions.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering anchoring support. The invention relates to a prestressed bolt support method and a segmented hollow grouting bolt, which are suitable for stratum structure support in underground engineering, mining engineering, foundation pit and slope engineering, and the like. Background technique [0002] In the process of underground engineering, mining engineering, foundation pit and slope engineering involved in geotechnical engineering, in order to prevent the formation from deforming, collapsing or destabilizing and endangering safety, a main support technology for strengthening the formation is to use bolts. The formation is strengthened by the high-strength tensile capacity of the bolt installed in the formation and the dense combination between the bolt and the grouting body around the anchor and the formation, so as to improve the integrity of the formation an...

AI Technical Summary

Problems solved by technology

The disadvantages are: 1) It is difficult to guarantee the fullness of the slurry, and because of the deviation phenomenon when inserting the steel bar, the thickness of the steel bar protective layer is not easy to be uniform, and the anchoring force is not large

Corrosion and destruction of steel bars

2) At the same time, because prestressing cannot be implemented, the grouting body cracks with the deformation of the steel bar, so that water vapor directly invades the steel bar, affecting the service life

3) Not suitable for broken ground

4) Since the bolt support force is formed after the mortar is slowly hardened, it is not suitable for occasions where the support force needs to be formed quickly

This technical solution focuses on the grouting support of weak and broken rock formations, but its disadvantage is that the anchoring time of the grouting body is too long, and the anchoring force cannot be quickly formed due to technological reasons, so it is not suitable for strata that require rapid support

[0014] To sum up, the above bolt types and bolt support methods have their own shortcomings, and are only suitable for certain rock formation conditions and occasions.

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