Pre-stress construction method of parallel steel stranded wire assembled cable in annular sealed steel pipe

Abstract

The invention discloses a pre-stress construction method of a parallel steel stranded wire assembled cable in an annular sealed steel pipe, and provides a reasonable, feasible, economic, simple and convenient pre-stress construction method aiming at the stay cable in the annular sealed steel pipe. By adopting the steel stranded wire assembled cable, the annular sealed steel pipe is internally provided with a one-way separation steering gear and a bidirectional cross separation steering gear; a guide hole channel of the steering gear and an end anchored hole are arranged in the consistent manner of a rectangle or similar rectangle. When the steel stranded wires penetrate through the annular sealed steel pipe one by one, the steel stranded wire, the guide hole channel of the steering gear and the end anchored hole are arranged in a mode of one-to-one correspondence, so that the steel stranded wires of the assembled cables in the same beam are parallel to each other to form the parallel steel stranded wire assembled cable. The end part of the stay cable is anchored by a single-hole anchorage, and the steel stranded wires of the assembling cable in the same beam are stretched by a small-size jack one by one. An anti-loosening press plate and a protective hood are arranged outside the anchorage to prevent a clamping piece from loosening under the low-stress state and protect the end part of the stay cable.

Description

technical field [0001] The invention discloses a method for prestressing construction of a prestressed steel structure provided with drag cables in an annular closed steel pipe in civil engineering, and belongs to the technical field of prestressed civil engineering. Background technique [0002] Prestressing technology has been widely used in civil engineering, and the required prestress is established in the structure by laying out prestressed materials in the structure and stretching it. In large-scale sports buildings, public buildings and industrial buildings, such as stadiums, exhibition centers and coal storage sheds, spherical large-span space steel structure roofs, such as spherical surfaces and ellipsoidal surfaces, are often used. This type of structure, especially when the rise-span ratio is low, will generate a large support horizontal reaction force under the action of vertical load. Prestressed cables can be laid in the annular closed steel pipe of the suppor...

AI Technical Summary

Problems solved by technology

[0010] Since the anchoring end of the cable is set outside the steel pipe near the intersection of the cables, the space at the anchoring end of the cable is limited by the shape of the cable at the intersection and the structure of the steel pipe, and it is difficult to meet the operating space of a large tension jack and its tooling. Therefore, it is difficult to realize the tension of the entire bundle of assembled cables, which must be tensioned one by one

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