Pressure grouting device for overall length spiral anchor rod and construction process

Abstract

The invention provides a pressure grouting device for an overall length spiral anchor rod and a construction process. The front end of the overall length spiral anchor rod is screwed with an anchor head; a pressure stop-grouting plug is formed by nesting a nylon inner plug with a rubber outer plug; the nylon inner plug is provided with a pressure grouting hole; an outlet of a pressure grout injector is connected with the bottom of the pressure stop-grouting plug; an outlet of a grout injector is connected with a grouting pipe and then connected with an inlet of the pressure grout injector; the outlet of the pressure grout injector is connected with a groove of the grout injector after passing through a return pipe; a decompression pipe is fixed on the anchor rod by a positioning central ring; micro-pores are distributed all over the decompression pipe; and an inner end of the decompression pipe stretches into the anchor head, and an outer end of the decompression pipe extends out of an anchor hole after passing through the pressure stop-grouting plug and the pressure grout injector. The device of the invention can conveniently and reliably realize the pressure grouting for an overall spiral mortar anchor rod and has the characteristics of no slurry loss, no slurry leakage and full grouting.

Description

technical field [0001] The invention relates to a bolt grouting device and a construction method thereof, in particular to a device for pressure grouting using a full-length spiral bolt and a grouting construction process thereof. Background technique [0002] The full-helical mortar bolt (the applicant's patent 200820062187.8) has the following characteristics: 1. There is a full-length continuous helix on the bolt body, which is convenient for arbitrary cutting to meet the needs of the construction site; 2. It is convenient to install the helix and various anchor heads, etc. Accessories, which are conducive to applying prestress when necessary; 3. The rod body adopts connection (standard or non-standard) screw with different tooth height. After grouting, the lower tooth height of the nut and the bolt body will be The mortar is filled and consolidated, so that the nut will no longer loosen on the bolt body due to external force. Therefore, the firmness of the structure is ...

AI Technical Summary

Problems solved by technology

Due to the above advantages, the full spiral mortar bolt has more applications in geotechnical engineering anchoring construction, but the existing grouting method has the following problems: On the one hand, the grout stop pipe of the grout injection machine is inserted through the grout plug connection In the anchor hole, there are problems that the outlet of the grout pipe is easily blocked and the installation of the grout pipe is not stable; on the other hand, it is difficult to discharge the air in the anchor hole during the grouting process, resulting in insufficient grouting and poor grouting quality

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