Concrete backfill device of unbonded ring anchor prestress lining structure anchorage groove and construction method

Abstract

The invention discloses a concrete backfill device of an anchorage groove of an unbonded ring anchor prestress lining structure and a concrete backfill construction method implemented based on the concrete backfill device. The concrete backfill device comprises a pouring formwork and a bending degree adjusting component. The pouring formwork is used for covering a groove opening of the anchorage groove and a bendable flat plate. A circular fixed hole is formed in the fixed end of the pouring formwork. An elliptical adjusting hole is formed in the adjusting end of the pouring formwork. The fixed hole and the adjusting hole are used for running through embedded pieces at the two ends of the groove opening of the anchorage groove. The bending degree adjusting component comprises a strip-shaped supporting plate and pressing plates. The pressing plates are connected with the two ends of the supporting plate. The middles of the pressing plates and the middle of the supporting plate are connected through adjustable top rods. Installation holes for running through the embedded pieces of the two ends of the groove opening of the anchorage groove are formed in the two ends of the bending degree adjusting component. By means of the concrete backfill device, the concrete backfill of the anchorage groove can be effectively and rapidly achieved in a labor-saving mode, poured concrete is firmand compact, the combination face of new concrete and old concrete is free of cracks, and the coordination consistency with the whole lining structure is good.

Description

technical field [0001] The invention relates to a concrete backfill device applied to an anchor groove of an unbonded ring anchor prestressed lining structure and a concrete backfill construction method based on the concrete backfill device, belonging to the technical field of anchor groove concrete backfill. Background technique [0002] Prestressed lining is generally used in pressurized water delivery tunnels, and ring anchor prestressed lining is a new lining technology to solve the problem of "poor surrounding rock conditions and thin covering layers" for pressurized water delivery tunnels. According to the different contact relationship between prestressed tendons and concrete, the ring-anchored lining can be divided into two types: bonded and non-bonded. Since the 1990s in my country, the ring-anchor prestressed lining structure has been used in pressurized tunnels, and with the construction of large-scale national projects, the construction of large and high-pressure...

AI Technical Summary

Problems solved by technology

However, the anchorage and steel strands are arranged in the anchorage groove, the distribution of the steel strands is very dense, the remaining space is limited, and the dry hard concrete is difficult to vibrate, and the backfilled concrete in the anchorage groove will flow downward under the action of gravity. It is easy to form micro-cracks on the joint surface of new and old concrete at the upper end of the anchorage groove. After the concrete is finally set, initial cracks will be formed. Later, under the extrusion of the operating water pressure, the cracks will become larger and larger, resulting in anti-corrosion grease in the anchorage. Flowing out from cracks, oil leakage occurs in the anchorage groove, which will pose a great threat to the safe operation of the structure

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