Device for limiting and protecting anchoring end of vertical steel strand

Abstract

The invention discloses a device for limiting and protecting an anchoring end of a vertical steel strand, belonging to the technical field of vertical bridge steel strand installation. The device comprises a steel strand, an iron sheet tube, an anchor bearing plate, an anchor cup and a clamping piece, and also comprises a limiting connecting plate, a limiting pull rod and a fastening nut, wherein a through hole is formed in the middle of the limiting connecting plate; the limiting connecting plate is arranged at the lower end of the anchor cup; the anchor bearing plate is fixedly connected with the limiting connecting plate by the limiting pull rod and the fastening nut; the size of the through hole is smaller than that of the outer edge of the bottom of the clamping piece and larger than that of the outer edge of the steel strand; the steel strand penetrates through the through hole; and the bottom of the clamping piece is clamped above the limiting connecting plate. The limiting connecting plate limits the downward movement of the clamping piece, and the anchor cup is tightly adhered to the anchor bearing plate and the clamping piece by using the limiting pull rod and the limiting connecting plate, so that the vertical prestress steel strand is tightly combined with the anchor cup and the clamping piece so as to form a group of relatively fixed overall structure, and the occlusion tightness is ensured; and moreover when the concrete is cast, grout does not leak into a mudjack duct and the clamping piece, so that the quality of construction is ensured. The device is simple in structure, rapid and convenient to install and convenient and economic in martial resource.

Description

technical field [0001] The invention belongs to the technical field of bridge vertical steel strand installation, and in particular relates to a position limiting protection device for the anchorage end of a vertical steel strand. Background technique [0002] At present, long-span bridges are gradually being promoted in my country, and the fine-rolled threaded steel bars used for vertical prestressing are gradually replaced by steel strands. The limit protection of the anchorage end of the vertical steel strand is generally constructed by tape wrapping method. This method is easy to isolate the concrete from the anchorage end structure, forming a space, destroying the integrity of the concrete structure, and easy to use in the formed space. Moisture accumulates, causing corrosion of the anchorage end parts, which in turn affects the durability of the bridge. Due to the limited strength of the tape, the steel strand, anchor plate, anchor cup and clip cannot be fully bonded ...

AI Technical Summary

Problems solved by technology

The limit protection of the anchorage end of the vertical steel strand is generally constructed by tape wrapping method. This method is easy to isolate the concrete from the anchorage end structure, forming a space, destroying the integrity of the concrete structure, and easy to use in the formed space. Moisture accumulates, causing corrosion of the anchorage end parts, which in turn affects the durability of the bridge

Due to the limited strength of the tape, the steel strand, anchor plate, anchor cup and clip cannot be fully adhered and fixed, causing the steel strand and the clip to slip off, making it impossible to stretch, and it is necessary to open a hole in the beam body and reinstall it.

In addition, during construction, sparks from electric welding, cutting, etc. may easily cause the tape to burn, resulting in failure of protection.

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