A device assembly and tensioning construction method for tensioning fork lug type cables or steel rods

Abstract

A device assembly for tensioning fork lug type cables or steel rods, including: reaction frame, tension rod, pole beam and jack, the reaction frame is similar to a "U"-shaped structure, divided into two pieces; " The opening of the U"-shaped structure is designed as a step shape, with bolt holes and semi-circular slots I for the tension rods to pass through the tension rods; Tie rods, with tension rod semicircular grooves II for installing tension rods on both sides; when it is used for tension construction, two pieces of reaction frames are respectively installed on both sides of the fork lugs of the fork lug type cable or steel tie rod, through bolts It is integrated with the connecting plate; the two halves of the pole beam are installed on the extension tube end of the fork ear cable or the steel rod, and are fixed by bolts; the tension rod passes through the pole beam and the reaction frame, and passes through the fixing nut at one end of the reaction frame For anchoring, the other end is installed with a jack and a backing plate and anchored by a tension nut. The device assembly is used for tension construction with good safety and strong versatility.

Description

technical field [0001] The present invention relates to a prestressed structure construction device and its method, in particular to a device assembly for tensioning fork lug cables or steel rods and a device for tensioning fork lug cables or steel rods. Construction method. Background technique [0002] In the prestressed structure, some prestressed cable bodies or steel rods are designed as the structural form of fork lugs at both ends, and the length adjustment is realized through the adjustment cylinder on the fork lug at one end; since the anchorage is connected by the fork lug, it cannot The prestress adjustment can only be adjusted by using the conventional connection sleeve and the anchor head to adjust the prestress by tensioning in the form of a pole; but because the adjustment of the prestress tool in the form of a pole requires the cable or steel rod, the installation position must be considered in the design , the design and manufacture requirements for the cab...

AI Technical Summary

Problems solved by technology

In the U-shaped tooling, the left and right U-shaped load-bearing rings are unevenly anchored through the conversion box, so that the force on the left and right U-shaped load-bearing rings is uneven during the tensioning process and deflects, which is not conducive to the application of stress; On the other hand, there is no constraint between the U-shaped load-bearing rings. During the tensioning process, the U-shaped load-bearing rings deviate along the axial direction of the pin shaft, and even slip off from the outer arc surface of the lug plate, making it difficult to achieve tension control. 3. The U-shaped load-bearing ring is in line-surface contact with the arc surface of the cable or steel rod, which is not conducive to local stress control, and it is difficult to achieve when large-tonnage tensioning is involved.

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