Large-span cable-stayed bridge stay cable anchoring traction device and traction construction method thereof

Abstract

The invention relates to a large-span cable-stayed bridge stay cable anchoring traction device and a traction construction method thereof. The device comprises an anchoring box, a cable guide pipe, atraction device and a back pressure device, a cable guide pipe is arranged on the anchoring box, one end of the cable guide pipe is positioned in the anchoring box, and the other end penetrates through the box wall of the anchoring box and is positioned outside the anchoring box. A traction device is arranged in the anchoring box, and a back pressure device is arranged on the anchoring box. According to the invention, two modes of steel strand soft traction of the traction device and beam end back pressure of the back pressure device are combined, the anchor cup of the stay cable penetrates into the cable guide pipe of the anchoring box from the outer end of the cable guide pipe of the anchoring box through the traction device, then the anchor cup is pressed out along the cable guide pipe,penetrates into the anchoring box and is locked through the back pressure device, so that the installation and fixation of the stay cable of the cable-stayed bridge are achieved.

Description

technical field [0001] The invention belongs to the technical field of construction and construction of cable-stayed bridges, and in particular relates to a cable-stayed cable anchoring traction device for a long-span cable-stayed bridge and a traction construction method thereof. Background technique [0002] With the continuous development of road and bridge technology, cable-stayed bridges are widely used as one of the main types of long-span bridges. At present, the common types of cable-beam anchorage in long-span cable-stayed bridges mainly include: anchor box connection, ear plate type connection, anchor pipe connection and anchor tie plate connection. Anchoring box-type cable beam anchoring method is composed of two different materials, steel and concrete, and it is a combined structure that bears tension together. It has the characteristics of high structural strength, strong tensile capacity, convenient construction and high construction efficiency. Therefore, The...

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Problems solved by technology

However, the inner space of the anchor box is narrow and the operation and construction space is limited, which cannot meet the installation and operation requirements of large traction equipment. The construction efficiency and construction period of cable-stayed bridges increase the construction cost. With the continuous development of road and bridge technology, cable-stayed bridges with a span greater than 1km have appeared. For example, the Shanghai-Tongjiang River Bridge under construction has a main span of 1092 meters, the longest stay cable reaches 576.2 meters, and the traction force at the beam end reaches more than 300 tons when the stay cable is installed. unable to meet needs

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