Non-bracket cable truss construction method for lifting entire body by obliquely drawing fixed jack

Abstract

The invention provides a non-bracket cable truss construction method for lifting an entire body by obliquely drawing a fixed jack. The non-bracket cable truss construction method comprises the following steps of: assembling a cable bar system of a cable truss at a low-altitude position above the ground surface, and hanging the edge cable head of a bottom chord cable at the edge cable head of a top chord cable by virtue of a bottom chord connection fixture cable; mounting a fixture ear plate at the anchoring node of a peripheral structure, arranging the jack on the fixture ear plate through a hanging frame in pin joint, fixing a counter-force frame on the edge cable head of the top chord cable, and arranging a drawing fixture cable between the jack and the counter-force frame; enabling the jack to work continuously, obliquely drawing the fixture cables so that the entire cable bar system is lifted to a high altitude position; connecting the edge cable head of the top chord cable with a fixing point of the top chord cable in position; and transferring the jack, the hanging frame, the counter-force frame and the fixture cables to a bottom chord and dismounting the bottom chord connection fixture cable; tensioning the bottom chord cable until the edge cable head of the bottom chord cable and the anchoring node of the bottom chord are connected in position so that the entire cable truss is tensioned and shaped. According to the non-bracket cable truss construction method, the jack fixed at the anchoring node of the peripheral structure is used, and the entire body of the cable bar system at the low-altitude position above the ground surface is lifted by obliquely drawing the jack. Therefore, the cost and work period of erecting a bracket are saved, a fixture is lightened, and the construction efficiency is improved.

Description

Technical field [0001] The invention discloses a method for constructing a prestressed cable truss structure without a support in a civil engineering project, and belongs to the technical field of cable structure construction in a civil engineering project. Background technique [0002] The cable truss is composed of only stay cables and compression rods, and belongs to the type of tension structure. The geometric topology of its components is similar to that of steel trusses, but is different from ordinary steel trusses. The upper and lower chord members are replaced with stay cables, and the web members are based on The internal force conditions are replaced with slings or struts, and reasonable prestress is applied to establish structural rigidity and maintain structural shape. In conventional engineering, the plan layout of the cable truss includes one-way, two-way and multi-directional spokes. The one-way and two-way cable trusses are a whole span, which is composed of uppe...

AI Technical Summary

Problems solved by technology

It can be seen that the construction method of this project does not use brackets, the upper string and the lower string are respectively pulled and stretched in place, and the sling is hoisted at the end; The tension force of the jack is reacted on the side ring beam. During the lifting and tensioning process, the spatial position of the jack moves in the air with the position of the cable head of the upper string and the lower string cable, and the edge ring beam is anchored from the stand to the final cable head. getting closer

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