In today's society, with the development of social economy, people's living standards and consumption levels have gradually improved, which also puts forward deep-seated requirements for bridge construction. As we all know, in bridge construction, especially suspension bridge, the structural construction of upper details is the most critical technical difficulty in the whole project. The reconstruction construction technology is very complicated and messy, and there are many procedures to be experienced in the construction, and the equipment configuration is also diversified. Therefore, the structural structure of the upper details is also the focus of people's research and analysis.

For a long time, with the continuous improvement of bridge analysis technology and the rapid development of expressway in China, new structural bridges have sprung up, and suspension bridges are also developing rapidly and gradually entering the peak period. However, in the process of analyzing the detailed structure of suspension bridge, experts have adopted various analysis methods, such as the combination of overall analysis and local analysis, dynamic and static analysis and so on. On the one hand, this greatly improves the quality of detailed structure analysis, but on the other hand, it also leads to blind spots in the design and construction of detailed structure of suspension bridges in China. At present, our country has not paid attention to the design and construction of the detailed structure of suspension bridges, so in the construction process of some suspension bridges, a series of problems often occur, such as local components being destroyed, which greatly reduces the durability and safety of the overall structure of suspension bridges. Therefore, this paper will study and explore the detailed structure of suspension bridge.

1. Necessity of application of construction technology for upper detail structure of suspension bridge

Suspension bridge is a bridge with cables as the key bearing capacity, and its bearing capacity mainly depends on two towers at both ends, also known as suspension bridge. As we all know, in the process of suspension bridge construction, no matter which part of the construction is not in place, it will affect the construction safety of the whole bridge. As the saying goes, details determine success or failure, so in the process of detailed structure construction of suspension bridge, details are the most critical factor, and its safety can not be ignored. According to research, the birthplace of suspension bridge is China, which has a long history. It was described as early as the Eastern Han Dynasty, when the suspension bridge used bamboo as a rope. Then the Akashi Strait Bridge in Japan was built at 1998, which is the largest span bridge in the world. In China, the related equipment and technical level of suspension bridges are relatively low. With the arrival of the 2 1 century, China has successively built the south branch suspension bridge of Jiangsu Runyang Yangtze River Highway Bridge and Xihoumen Bridge of Zhejiang Zhoushan Continental Link Island Project. However, due to backward technology and lack of specialized equipment, China has vigorously developed and independently developed relevant facilities and equipment. The results show that this kind of equipment in China has reached the international advanced level. However, we must attach great importance to the construction of its detailed structure to ensure the safety of suspension bridge construction and its own stability and durability.

2. Pay attention to the application of detail construction technology in suspension bridge.

2. 1 Cable Tower Construction

Generally speaking, the pouring of the cable tower body is mainly carried out in sections by turnover formwork method, but in some parts of the connecting plate of the main tower, attention should be paid to retaining the lower formwork and steel bars in advance to support the embedded parts. In the process of construction, verticality monitoring should be the main implementation object of tower construction. After each section of concrete construction is completed, the total station will be used for monitoring at 8:00-9:00 the next morning to maintain a relatively stable temperature, so as to ensure that the quality of concrete can be observed at any time and facilitate its adjustment. In addition, in the process of construction, the elevation of the top surface should also be checked, and the lateral axis deviation and elevation deviation of the cable saddle should be strictly controlled. The principle of close contact should be strictly observed on the base and bottom surface of the saddle body, and the gap around it can be filled with butter when necessary.

2.2 Anchorage construction

Anchor, its main components are: saddle, anchor rod and anchor block. The function of saddle is very simple, which mainly bears the pressure of loose saddle directly under the action of main cable and gradually transfers it to bedrock. Anchor rod, which plays a key role in strengthening the connection between rock mass and anchor rod and improving the excavation strength of disturbed area around anchor hole during the initial support excavation period. At the same time, the anchor hole can be fully utilized, so that the slurry can be poured into the surrounding rock of the anchor body. As for the anchor block, its main function is to transfer large tensile force to the rock mass and accommodate the anchorage system of the anchor. If the anchor block adopts gravity anchor, then two situations will occur. First, if the solid bedrock in the anchorage zone is under the bridge deck and the depth is between 30 meters and 50 meters, then it can be built; If the buried depth is large and the design purpose is to transfer all the load to this bearing stratum, then open caissons, open caissons and large-diameter piles, including common piles, will be set up, but the price of this measure is relatively high. Secondly, if there are solid rocks at the anchorage and the anchorage is very close to the surface, it is very likely that the repair and construction of tunnel anchors will become economical.

2.3 stiffening beam construction

Steel truss is the main means of stiffening suspension bridge, and its imaginary means is just like steel truss bridge. Generally speaking, large floating cranes, cable cranes and hauling cranes should be used for installation. After each beam segment is spliced, it can be connected with the corresponding sling immediately, and then transported to the main haulage by the sling.

2.4 Main cable construction

The main cable is the most important component of suspension bridge. Generally speaking, the main cable is formed by extruding multiple strands of steel cables. In order to ensure the uniform stress of the main cable, it is necessary to keep the relative balance between each steel cable and the reference cable. In addition, the steel wire of the main cable should also be protected. The circulating cable is erected as the traction power of the main cable strand, and then the anchor rail is built as the working place of the main cable construction. Generally speaking, the construction procedure is as follows: (1) build an anchor track and establish a traction system; (2) Main rope traction is adopted for traction; (3) manufacturing a single-ended cold-cast anchor head; (4) plastic surgery; (5) adjust the shape of the line; (6) Set the main types; (7) Install slings and cable clamps. The methods of constructing the main cable can be divided into prefabricated clavicle method and death method. However, no matter which framing method is chosen, the setting of reference line is the premise, so that the verticality of other lines can be well adjusted, which also paves the way for the linear adjustment, shaping and finalization of the main cable. At the initial stage of main cable forming, it should be carried out at night under the condition of stable temperature, and the machine should be tightened. The key points to be squeezed are as follows: first, squeeze in the middle of the two main towers; Second, squeeze both ends of the span again, and the extrusion distance should be kept within the range of 1 m. Third, tie the spare steel belt, and keep the spacing at 0.5 meters. Finally, it is necessary to ensure that the gap probability of the main cable segment meets the design requirements after the main cable is squeezed.

3 construction technology

In terms of construction technology, the cultivation of concrete, the shortest construction period of protection, the control and supervision of the thickness of concrete protective layer and its vibrating means are limited and corresponding requirements are put forward to ensure the pouring quality of concrete. In addition, we should also establish some new ideas, so that the construction depends on efforts to meet the design requirements and facilitate the construction of workers. Don't blindly pursue novelty, novelty and greatness, but it is completely inconsistent with the actual construction experience and ability, so the construction quality will be greatly reduced.

4 abstract

Through the above contents, in the construction of detailed structure of suspension bridge, we should follow the above related aspects to ensure the safety, stability and durability of its construction. At present, the construction technology of upper detail structure of suspension bridge in China is not perfect enough. Therefore, we should strengthen the improvement of this technical level and eliminate potential safety hazards to ensure the safety and smooth construction of the superstructure of suspension bridges.

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