Construction method for quickly assembling and disassembling guy cable of stayed-cable bridge

Abstract

The invention relates to a construction method for demounting a cable-stayed bridge fast. An anchor is hard to be removed under the condition that a stayed cable has cable tension, a special tool is used for transforming the stress of an upper anchor ring, a cable and a lower anchor head into zero, then an upper anchor head is cut by compulsion, the cable is chopped up, and the lower anchor head is removed for saving the anchor-removing time, so as to change cables fast. A punching tensioning jack is installed at an anchor pipe opening of the cable. A tension rod is arranged in the jack. The tension rod tensions after penetrating into a tool anchor ring. The tool anchor ring is screwed into the tail end of an anchor head to replace an old anchor ring, and the old anchor ring is taken out by cool cutting. The jack is moved to the tail of the tension rod by the repeated tension and release of the tool anchor ring to ensure that the cable still has 30 to 40 tons of tension. Two sets of cable clamps are used for clamping two ends of the cable to be chopped up. A windlass pulley set is connected between the cable clamps. The pulley set is frapped to transform the internal force of the cut section of the cable into zero and chops the cable. A hoisting apparatus is used for taking out the cut cable on a tower. A hollow drill rod is used for drilling concrete or epoxy mortar in a cable anchor pipe at the end of a beam. The punching tensioning jack is used for pulling out the anchor head by compulsion.

Description

technical field [0001] The invention relates to a method for replacing cable-stayed bridge cables, in particular to a construction method for quickly dismantling cable-stayed bridge cables when removing old cables in the replacement of cable-stayed bridge cables. Background technique [0002] Cable-stayed bridges emerged in Europe in the 1950s and were introduced to China in the 1970s. Since the reform and opening up, with the continuous improvement of comprehensive national strength and the overall level of science and technology, computers have successfully solved the complex structural calculation problems in bridge design and construction. A large number of high-performance materials and complex large-scale construction equipment and processing technology have been used in bridge construction. As a brand-new bridge-type cable-stayed bridge with complex structure and high cost, it has appeared in large numbers on important transportation hubs of highways and railways, carr...

AI Technical Summary

Problems solved by technology

The replacement of cable-stayed cables is generally carried out without interrupting the traffic. For the early cable-stayed bridges built in my country in the last century, due to various reasons, during the process of replacing and removing the old cable-stayed cables, the anchor head of the cable tower often occurred. The anchor ring cannot be withdrawn from the anchor ring due to corrosion or the matching accuracy error of the anchor ring is too large; the anchor pipe of the cable stay on the concrete main beam is filled with small stone concrete or epoxy mortar, which makes it difficult for the lower anchor head to withdraw normally, which seriously restricts the During the construction period of the cable replacement, it often takes 4-5 days to dismantle an old cable, causing serious traffic congestion for a long time in important transportation hubs, serious economic losses and adverse social impacts