Method for hanging and installing long and heavy cables through multi-point hanging of under-bridge unfolding cables

Abstract

The invention belongs to the technical field of cable-stayed bridge tower stay cable construction, and particularly relates to a long and heavy cable hanging installation method for multi-point hanging of a spread cable under a bridge. Comprising the following steps that S100, a winch located on the other side of a cable-stayed bridge tower on a bridge floor is connected with an anchor head at one end of a stay cable through a traction steel wire rope, and the traction steel wire rope passes through a bridge side steering fixed pulley at the end of a cable-stayed bridge box girder; and S200, the traction steel wire rope pulls the stay cable to vertically and upwards lift to the height of the bridge floor. And S300, a cross beam cantilever hanging bracket is arranged at the position above the bridge floor of the bridge tower of the cable-stayed bridge. And S400, the front cantilever winch and the rear cantilever winch penetrate through a front cantilever support fixed pulley and a rear cantilever support fixed pulley on the cross beam cantilever hanging bracket through steel wire ropes correspondingly to pull up the stay cable alternately. And S500, the stay cable anchor head is lifted to the position of the tower end cable guide pipe. And S600, the tower crane is used for continuously increasing the remaining length of the stay cable. And S700, after the anchor head at the beam end of the stay cable is lifted to the bridge floor, each lifting point is gradually lowered.

Description

technical field [0001] The invention belongs to the technical field of cable-stayed cable construction of a cable-stayed bridge tower, in particular to a long-heavy cable hanging and installation method for multi-point hanging under the bridge. Background technique [0002] With the increasing development of bridge construction, long-span cable-stayed bridges have been used more and more. Conventional stay cable scheme: After the stay cable is transported to the site, it is hoisted to the bridge deck cable tray by tower crane or floating crane or large ground crane. Put it into the cable guide, pull it to the beam end position by the cable spreading trolley, and fix it with a cap outside the anchor plate. At this point, the bridge deck cable spreading and the beam end hanging cable are completed, and the pulling wire rope in the tower is installed at the tower end, and the tower top winch Cooperate with the tower crane to lift the front end of the tower end of the cable-sta...

AI Technical Summary

Problems solved by technology

[0003] As the diameter of the cable stays becomes larger and the length and height of the cables at the tower end increase, the traction force required for hanging the tower end will become larger and larger, which is easy to occur when using conventional equipment. Insufficient upward traction, or insufficient space for spreading cables, etc.

When the stay cables are too long and too heavy, larger tonnage lifting equipment is required for the stay cables to go up the bridge as a whole, which does not meet the actual application on site, and the traction force required for the cables hanging at the tower end will be greater, making the lifting capacity exceeding the allowable lifting capacity of the tower crane. scope, it is easy to cause safety accidents

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