Multi-section bubble assembly type anchor rod with stable pulling resistance and anchoring construction method of multi-section bubble assembly type anchor rod

Abstract

The anchor rod comprises a plurality of prefabricated sections, each prefabricated section comprises a hollow rod body, a water permeable hole section is formed in the middle of each hollow rod body, a geotextile membrane is glued outside each water permeable hole section, and then each water permeable hole section is sleeved with a geotextile bag; mounting holes in the two ends of the geotextile bag are cemented with the hollow rod body, the geotextile bag is sealed after a polyurethane composite material is injected into the geotextile bag, and limiting buckles are symmetrically connected to the outsides of the two ends, corresponding to the geotextile bag, of the prefabricated segment and used for limiting axial expansion of the polyurethane composite material; the adjacent prefabricated sections are in threaded connection to form the anchor rod with the designed length. According to the method, the foam is formed through chemical reaction of the polyurethane composite material instead of compaction grouting in the prior art, the construction procedure is simplified, the operation difficulty is lowered, the foam quality is guaranteed, the high-stability pulling resistance of the anchor rod after anchoring can be guaranteed, and reference significance and technical guidance can be provided for design, construction and improvement of the anchor rod.

Description

technical field [0001] The invention belongs to the technical application field of geotechnical engineering, in particular to a multi-section foam assembled bolt with stable pullout resistance and an anchoring construction method thereof. Background technique [0002] The pull-out resistance of traditional bolts is provided by the shear strength of the soil and the surface of the bolts. As for the multi-section foam bolt, the geotextile covering the grouting hole of the bolt forms node cells by grouting through compaction, thereby providing pull-out resistance. On the one hand, due to grouting, the soil near the nodal cells is compacted and compacted, thereby fixing the nodal cells and increasing the pullout resistance; on the other hand, the generation of nodal cells makes more compressed soil accumulate in the nodes Before the bubble, a larger reaction force is generated, which in turn increases the pullout resistance of the multi-section bubble bolt. It can be seen that...

AI Technical Summary

Problems solved by technology

However, when performing compaction grouting on site, the scale of supporting equipment is large, and the operation of the compaction grouting process is complicated. It is difficult to check the quality of multi-segmented anchor bolts after grouting, and it is impossible to determine whether the size and quality of the segmental cells meet the requirements.

This makes it difficult for multi-section foam bolts to meet the designed pullout resistance standard, but currently there is no technical means to improve the quality of multi-section foam bolts used in its construction process

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