The significance of bridge reinforcement and maintenance
Under long-term use, the bearing capacity of the bridge will also decrease over time. Therefore, this requires relevant bridge maintenance workers to find the problems in the use of the bridge in time and take effective measures to solve the problems. Simply put, it is to strengthen the bridge. By strengthening and repairing the bridge, on the one hand, the damaged parts of the bridge structure can be effectively repaired. On the other hand, it can ensure that the bridge is in normal operation and prolong the service life of the bridge. When strengthening and repairing the bridge, a specific analysis should be made according to the existing problems of the bridge. If the damage to a part of the bridge is serious, a solution can be made without affecting the entire bridge layout, which can save costs to the greatest extent. When strengthening and repairing bridges, we should also pay attention to all aspects of safety issues to avoid safety accidents to the greatest extent. In addition, the main materials used for bridge reinforcement are concrete and steel bars. Therefore, in the actual construction process, the quality of concrete and steel bars must be strictly checked.
Causes of bridge diseases
There are many factors that cause bridge diseases. For example, the engineering design plan is unreasonable, the cross-section size and area of the steel bars in the bridge do not meet the actual requirements of the project, and there are problems in the allocation ratio of steel and concrete. It will have an adverse impact on the quality of bridge construction, and eventually cause bridge diseases, which will bury potential safety hazards for later use. Based on the bridges with the above-mentioned disease conditions, during actual operation, the concrete in them will automatically have problems such as creep and dry shrinkage. As a result, the prestress of the bridge structure decreases, causing bridge cracks. At the same time, the strength and stability of the bridge's reinforced concrete structure will also decrease.
For bridges, steel and concrete are important components. If there are harmful substances in the air at the location of the bridge, especially in areas with severe smog, the steel and concrete will be affected and corroded. In addition, natural disasters will also affect the bridge structure to a certain extent. In some mountainous areas in my country, mudslides caused by heavy rain and other weather will cause serious damage to the bridge and accelerate the aging speed of the bridge. At the same time, human factors can also cause bridge traffic accidents and impact the bridge structure, thereby reducing the stability of the bridge.
No matter what kind of bridge it is, there is a certain bearing capacity limit. If the specified bearing capacity of the bridge is exceeded during actual use, it will cause damage to the bridge structure to varying degrees, especially the bridge with a long service life. With the increase of traffic volume, operating hours and other factors over time, the load on the structure will also increase, resulting in damage to the bridge structure and fractures in severe cases, which can easily cause serious economic losses and potential safety hazards.
The basic principles of bridge strengthening
First, rationally design the bridge reinforcement and maintenance plan, combining the actual situation of the current damage to the bridge, and at the same time, carry out the maintenance work with high efficiency and high quality. In addition, avoid excessively long bridge reinforcement and maintenance time;
Second, generally speaking, bridge reinforcement and maintenance work is carried out on the existing foundation. If the original structure of the bridge is changed, the foundation must be changed only when the damage degree cannot meet the needs of use;
Third, to strengthen and repair the bridge, attention should be paid to the repair of its internal materials to make it fit perfectly with the original bridge without affecting the appearance of the bridge.
Reinforcement and maintenance technology of reinforced concrete bridge
The so-called foundation flushing is simply to use concrete to supplement the position where the bridge section is flushed out; if the bridge foundation subsidence occurs, the support method should be used to strengthen it. Strengthening the protection design on the outside of the bridge can improve the stability of the entire bridge and design a supporting wall that can support the strength. The material used for this wall is generally a combination of concrete, masonry stones and other materials.
First, generally speaking, if there are cracks in the main arch ring of the bridge, relevant maintenance personnel are required to reinforce the main arch ring. There are two main maintenance methods. One is reinforcement and maintenance of arch back; the other is reinforcement and maintenance of soffit. The choice of maintenance method depends on the water flow below the bridge and the traffic flow above the bridge. In addition, by strengthening the arch ring, it is beneficial to enhance the utilization of the reinforcement material.
Second, when the main arch ring lining technology is selected for bridge reinforcement and maintenance, it also shows from the side that the current bridge pavement damage is very serious, and there is even the danger of bridge revetment being impacted by river water. Based on this, in order to effectively ensure that the bridge revetment will not be damaged due to river erosion, the original structure of the bridge should be reinforced at this time by using the lining technology of the main arch ring. If various components in the original reinforced concrete structure of the bridge cannot be used anymore, the bridge structure should be dismantled. After the construction of a new bridge, the old and unusable bridge parts can also be replaced with new ones. The purpose of this is to ensure that the main arch ring reinforcement of the bridge can be carried out safely.
First, after completing the reinforcement and repair work of reinforced concrete bridges, corresponding quality inspections should be carried out on the effectiveness of the reinforcement and repair. In other words, it is to control the quality of building materials used in the process of bridge reinforcement and repair. The concrete and steel bars used in bridge reinforcement and repair are required to meet current national requirements. Fundamentally, to avoid the problem of "substandard" materials, the steel bars and concrete used should have the conformity mark issued by the national quality inspection department.
Second, carry out the construction work according to the already designed construction drawings of the bridge reinforcement and repair project. At the same time, the content in the design drawings should be reviewed to ensure that the content on the drawing meets the actual situation of the current bridge reinforcement and repair project. Ensure that it has a certain implementation feasibility.
Third, when selecting gravel materials, we must ensure the quality of the materials, and when the ratio of gravel to concrete is carried out, we must also ensure that it meets the construction standards for bridge reinforcement and maintenance. Strictly implement the pre-construction preparations, and increase efforts to monitor the reinforcement technology used in the entire bridge project. For bridge reinforcement projects, as a key part of the entire bridge, it should adopt fully automatic, fully intelligent and real-time monitoring of the entire process. In addition, random inspections should be conducted on the proportion of concrete materials used in reinforcement and maintenance to ensure that their quality meets the standards for use.
Fourth, in addition to the above, standardized management and control of the specific construction steps in the bridge reinforcement and repair process should be adopted to analyze which link is most prone to construction problems during bridge reinforcement and repair. More attention should be paid to the parts prone to bridge diseases to better demonstrate the construction effectiveness of bridge reinforcement and maintenance technology.
Conclusion
From the perspective of the application of reinforcement and maintenance technology in my country at the current stage, good application results have been achieved. Through strict management and control of various tasks, the overall work quality has been greatly improved. China should increase its emphasis on the construction of related systems, actively research and update reinforcement and maintenance technology, further enhance the operational stability of my country's reinforced concrete bridges, and promote the stable development of my country's bridge industry.
Language: English
