Vertical pipe vacuum pre pressing bidirectional slip casting method and sealed slip casting system thereof

Abstract

The invention is a vertical-tube vacuum-precompression bidirectional slip casting method, comprising the steps of making hole, installing seal slip casting system, sealing orifice, normal-pressure slip casting, prevacuumizing, vacuum slip casting, reverse slip casting, and so on; the seal slip casting system includes anchor hole, anchorage cable, orifice grout sealer, vacuum pump, slip casting pump, sealing plate, slip casting tube and vacuum tube, the orifice grout sealer situated at the orifice of the anchor hole, the sealing plate situated on the end surface of the orifice, epoxy resin poured between the sealing plate and the orifice grout sealer, the orifice grout sealer being bowl-structured, and one or more orifice grout sealers linked in series in the same or counter direction and closely fitting anchor hole wall, the vacuum tube passing through the sealing plate and the orifice grout sealer to reach the top of the anchor hole, and the slip casting tube passing through the orifice grout sealer and 30-40cm higher than the internal end surface of the orifice grout sealer.

Description

1. Technical Field: [0001] The invention relates to a construction method, in particular to a grouting method for construction of a prestressed anchor cable with a certain elevation angle and a sealing grouting system. 2. Background technology: [0002] In the current practice of underground geotechnical engineering, due to the stability and durability requirements of underground caverns, traffic tunnels and military caverns, supporting measures must be taken for the surrounding rock. Although the support methods and construction methods are different, the comprehensive consideration of the support content should include anchor rods or anchor cables, and the construction of 0~180 (counterclockwise) anchor rods or anchor cables—— That is, prestressed anchor cables or bolts with a certain elevation angle generally use atmospheric grouting from the hole to the bottom of the hole, but due to the lack of grouting of the hole and the "air cushion" at the top of the hole, the sealing pe...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the existing underground geotechnical engineering practice, the grouting at the upper elevation angle adopts the normal pressure grouting method from the hole to the bottom of the hole. , the sealing performance is not good enough, which often leads to the problems of excessive stress loss and failure of the anchor cable body due to premature corrosion; provide a fast grouting speed, which can effectively eliminate the "air cushion" of the channel, so that the channel slurry is more uniform and dense , the sealing system has good sealing performance, can effectively improve the anti-corrosion effect of the anchor cable body, and ensure the long-term use performance of the anchor cable body

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