Anti-corrosion and anti-rust maintenance management of high-speed rail steel structure station canopy

In recent years, the travel volume of high-speed rail has gradually increased, bringing convenience to people’s lives. In order to effectively realize the sharing of multiple functions of high-speed rail, thereby promoting the innovation of modernization level, it is necessary to ensure the overall quality of high-speed rail. To ensure the quality level of high-speed rail, in addition to controlling the facilities of the main part of the high-speed rail and the road tracks of main roads, it is also necessary to ensure the effective implementation of high-speed rail background operations. As a part of the high-speed rail service, the station canopy can provide a venue for service personnel to provide consultation for passengers, and at the same time provide passengers with a comfortable and safe waiting environment. More importantly, the station building and canopy also bear part of the responsibility for the operation in front of the station, which plays an important role in contacting and communicating the overall operation of the high-speed rail. Therefore, the construction personnel of the high-speed railway must carry out the quality improvement work of the station canopy, and the steel structure of the station canopy is restricted by the natural climate conditions all year round, and it is easy to produce corrosive substances, thereby reducing the quality. The staff must carry out anti-corrosion and anti-rust treatment, and strengthen the maintenance and management.

1 Corrosion and rusting of the steel structure of the canopy of the high-speed railway station building

1.1 The basic situation of corrosion and rust of the steel structure of the canopy of the high-speed railway station building

Judging from the current construction of many high-speed railway station canopies, the staff still have some understanding of the basic structure of the station canopy and have constructed specific components such as the top beams, platform columns, and top open air. Since these parts enclose a square and cylindrical plane, in order to ensure its stability, more solid materials are often poured under the canopy of the station building, and several coats of whitewashing are carried out at the same time. However, due to long-term exposure to the sun and rain, these columns are prone to coating cracks and peeling off. The staff must coat the columns with thick materials to avoid this result. In addition, although the stability of the column is relatively high, the top is relatively more fragile, and the top of the canopy is the most vulnerable to sunlight and rain, and the chalking and falling off on the sunny side are extremely serious, which is mainly Because the coating does not have good anti-corrosion performance, the coating materials used by the construction personnel can only guarantee its basic stability, but cannot resist the impact of external forces and the invasion of natural weather, and cannot guarantee the quality for a long time. In addition to the fact that the material specifications of the beams at the top are not high enough, the staff is not careful enough, and the scales are not evenly applied during the coating process, resulting in gaps in the beams and columns of the body, and then slowly spreading, resulting in large areas of corrosion.

1.2 Corrosion characteristics of the steel structure of the canopy of the high-speed railway station building

Because the column plane of the canopy of the high-speed railway station building is mainly made of steel structure, it can bear the load force of the upward and downward heights, so it has stability. However, the steel structure is easily oxidized under the action of air, and rust appears on the steel surface. Therefore, construction personnel needs to effectively treat the coating so that the steel structure paint film can not be affected by the air. However, many construction workers did not effectively treat the coating, resulting in weak adhesion of the paint film and easy swelling. Once it is weathered, it gradually breaks away from the steel structure, and the protective layer on the surface disappears, making it difficult to resist the natural climate. corrosion problem.

2 Specific strategies for anti-corrosion treatment and maintenance management of the steel structure of the canopy of the high-speed railway station

2.1 Formulate the system of anti-corrosion and anti-rust work and maintenance management

Judging from the corrosion situation of the high-speed rail station building, the fundamental reason is that the construction did not consider the problem comprehensively, and did not specifically study and analyze the source, cause, and solution of the corrosion problem, which resulted in only the strength and firmness being guaranteed during the construction process. . Therefore, it is necessary to put forward the importance of anti-corrosion and anti-rust. In view of various problems of corrosion and rust in the canopy of high-speed railway station buildings, organize corresponding staff to conduct in-depth practical explorations, and use field investigations and information technology data collection methods. Formulate effective plans and prepare contingency plans in advance. In order to ensure that the plan can be implemented in place, it is necessary to formulate a protection system. First, change the mode of maintenance management. According to the ultimate goal of anti-corrosion and anti-rust, divide the specific standards such as coating treatment and paint selection for the staff, so as to control the construction. Sort out the workflow of personnel, organize the corresponding supervision and management department, connect with each construction personnel, supervise and review the area to which they belong in a timely manner, make judgments on whether the construction personnel really follow the steps, and guide the construction personnel to effectively complete the goals. Secondly, it is necessary to introduce construction management and anti-corrosion detection technology to ensure close communication between personnel throughout the process, and to use detection technology to determine whether the target data is achieved. Finally, after completing the basic anti-corrosion and anti-rust goals, conscious innovations should be made in combination with the construction environment and environmental protection concepts to strengthen the final quality, so as to ensure the practicality, convenience, applicability, and distinctive features of the system. In view of this, the following characteristics must be met in the selection of coating types: first, the top coat should follow the principle of being non-toxic and harmless, and have the advantages of physical and chemical properties, acid and alkali resistance, salt resistance and light resistance; secondly, the choice of intermediate paint A strong rust barrier is required; finally, a primer. The primer acts on the low surface of the steel structure, the slight rust layer, and the wet part. For this, the paint on this part should have the characteristics of fast drying and strong adhesion. At present, anti-corrosion coating products are mainly single-component (XJL-900 primer) and two-component (XJL-900 topcoat), among which XJL-900 primer is a new type of anti-corrosion treatment coating, and XJL-900 topcoat is a nano High-grade paint, mainly made of ASA emulsion and polyisooxyester. In short, the implementation of a complete set of anti-corrosion systems for the steel structure of the column-free canopy can effectively increase the service life of the steel structure to 10 years.

2.2 Incorporate steel structure corrosion repair into work content

Steel structure paint film defects and corrosion of damaged parts can be repaired by paint film to improve the corrosion resistance of steel structures without affecting the normal operation of high-speed rail stations. First, repair the damaged part. When the primer of the steel structure is intact, use sandpaper to dedust the surface, and then apply the same topcoat to ensure that the paint film thickness of the steel structure reaches the specified standard. Second, repair the defects of the paint film. In the steel structure coating stage, if the construction method, construction environment, and other factors are not considered carefully, there will be defects in the paint film, such as air bubbles and wrinkles, pinholes, and sagging. In view of this, in order to effectively guarantee the construction life and performance of the steel structure, it is necessary to use the method of paint film repair to strictly deal with it. During this period, the surface of the steel structure should be polished with paper sand, and the dust on the surface should be removed. , Combined with the use of the XJL-900 topcoat, it is repaired.

2.3 Strengthen the quality management of coating

Construction personnel must understand the importance of coating, and different coating methods will affect the anti-corrosion performance of station canopies with different specifications and planes. Therefore, the coating work should be carried out independently, and an inspection team should be formed to supervise and review the material re-inspection, the appearance of the paint film and the improvement of the coating method, etc. Determination. First, in the process of re-inspection of coating materials, construction personnel must carry out according to the batch of production materials, the process of using materials and other standards, and immediately detect and collect data as soon as the coating enters the site, so as to provide future provide a basis for the determination. Second, the staff must create a good paint film appearance, be able to find problems such as paint film bubbles falling off, pinhole cracks, etc., from the places visible to the naked eye of the painter, and implement solutions immediately, so as to effectively control the risk of the paint film, to adjust the overall handling. As the scale of my country’s high-speed rail construction increases, the construction team must effectively plan and design the quality system of high-speed rail construction, so as to be able to sort out all links that affect the quality of high-speed rail, improve local quality, and ensure the overall effect. The canopy of the station building is an important part of the high-speed railway. Whether the steel structure can be trusted is very important. However, the traditional working methods are not suitable for the current modernization requirements. It is necessary for the construction team to change their thinking steadily and apply modern technical measures to strengthen the maintenance and management of the station canopy.