Double-pipe grouting bagged anti-floating anchor rod for stratum with high confined water head and construction method of double-pipe grouting bagged anti-floating anchor rod

Abstract

The invention discloses a high confined water head stratum double-pipe grouting bagged anti-floating anchor rod and a construction method thereof.The high confined water head stratum double-pipe grouting bagged anti-floating anchor rod comprises an anchor rod assembly, a grouting system and a sleeve, the anchor rod assembly comprises a sealing device, a bag body, an anchor plate and a plurality of anchor bars, and a plurality of limiting plates are evenly distributed on the anchor rod assembly in the length direction; the grouting system comprises an out-bag grouting pipe, an in-bag grouting pipe and an in-bag grout outlet pipe, the sealing device comprises a sealing plug and a sealing ring, the top of the bag body is fastened between the sealing plug and the sealing ring of the sealing device, a sealing hole is reserved in the sealing plug, and the in-bag grouting pipe and the out-bag grouting pipe are respectively provided with a pressure monitoring device. Through the construction method that all-casing follow-up hole forming is matched with out-bag grouting, in-bag pressure grouting and out-bag secondary pressure grouting, smooth construction of the anti-floating anchor rod in the high confined water head stratum is guaranteed, the construction quality is guaranteed, and meanwhile the uplift bearing capacity of the anti-floating anchor rod is improved.

Description

technical field [0001] The invention relates to the technical field of construction anchors for confined water foundation pits, in particular to a double-pipe grouting bag anti-floating anchor in high-pressure water head formations and a construction method thereof. Background technique [0002] In order to reduce the adverse effects of groundwater buoyancy on underground projects such as basements, underground complexes, and underground transportation facilities, effective anti-floating measures must be taken. As one of the main anti-floating measures, anti-floating anchors have been widely used in the engineering field. Anti-floating anchors can withstand the upward effect of groundwater buoyancy on underground projects, and avoid engineering accidents such as floor cracking, column damage and inclination of the upper building structure caused by the floating of the foundation. [0003] Anti-floating anchors are usually constructed after the foundation pit is excavated to...

AI Technical Summary

Problems solved by technology

The above situation will lead to the following two problems: (1) It is difficult to form a hole in the construction of the bolt, which can easily cause the hole to collapse, resulting in the failure of the bolt body to be lowered; The cement grout poured around the floating anchor will be continuously diluted and taken out of the orifice, seriously affecting the grouting effect and the construction quality of the anchor, and reducing the pull-out bearing capacity and anti-corrosion performance of the anchor

Continuous loss of pressurized groundwater will also lead to a drop in the groundwater level around the foundation pit, causing ground subsidence and threatening the safety of buildings, roads and underground pipelines around the foundation pit

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