Do you know the main construction technology of suspension bridge

1. Construction of the main tower

Suspension bridges generally have higher main towers, and most of the tower bodies are cast in sections by the over-molding method. At the position of the main tower connecting plates, it is necessary to reserve steel bars and formwork support embedded parts. The concrete on the top of the saddle tunnel should be poured after the main cable is erected to facilitate the construction of the saddle and cable. The construction control of the main tower is mainly verticality monitoring. After each section of concrete construction is completed, when the temperature is relatively stable between 8:00 and 9:00 the next morning, use a total station to monitor the verticality of the tower for adjustment For the concrete construction of the tower body, it is necessary to avoid testing during periods of severe temperature changes, and at the same time observe the concrete quality at any time, and adjust the concrete ratio in time.

2. Saddle construction

Check the elevation of the top surface of the steel plate, clean the surface and surrounding pin holes after meeting the design requirements, hoist them in place, and align the pin holes so that the base and the steel plate are pin-connected. Carry out oiling treatment on the surface of the base, and install the main body of the saddle. The cable saddle is composed of a cable seat, a bottom plate, and a cable cover. The cable saddle is difficult to hoist and position as a whole; it can be lifted and assembled in blocks by a crane or hoisting equipment. The installation error of the saddle is controlled at the maximum horizontal axis error of 3mm, and the maximum elevation error is 3mm. After being hoisted into the seat, insert the pin for positioning. The bottom surface of the saddle body is required to be closely attached to the base, and the surrounding gaps are filled with butter.

3. Pouring the main beam

The pouring of the main beam concrete is the same as the ordinary bridge. First, the beam elevation control must be accurate, and the settlement deformation of the reserved bracket must be accurately calculated; secondly, the pre-embedded parts of the beam body require high precision, especially The reserved hole of the tie rod should have an accurate position and good verticality to ensure that the tie rod is always located in the center of the hole during the normal tensioning process.

The pouring sequence of the main girder should be constructed symmetrically from both ends to the middle to prevent the support offset caused by unbalanced load. During the construction, observe the support settlement value with a level and record it in detail. Immediately after forming, re-measure the beam line type, compare the actual line type with the design line type, and feedback information in time to adjust the next construction.

The above is the main construction technology of the suspension bridge. Of course, a complete bridge of several kilometers can not be summarized by a simple construction technology. It still has countless construction workers working day and night. There is a lot of design and research in the early stage. The bridge carries not only transportation, but also years of accumulated history and highlights the increasing development of my country's bridge technology.