What should be paid attention to in the construction of subway monitoring system?

risk assessment is an important consideration for smooth construction. before discussing the construction details, risk assessment is an important engineering topic. Risk assessment is not about estimating the project cost, but evaluating and analyzing the past and possible technical and field problems of the subway monitoring project, comparing the experienced cases with the possible technical or environmental risk problems, and checking whether the subway monitoring project undertaken has the same problems and the environment it faces. Usually, the excessive proximity between the power trunking and the weak current trunking may affect the signal transmission quality, and the wall decoration material of the subway station may not be able to support the weight of the camera and the fixing frame. There will also be foreseeable risks, such as the location of pipelines or equipment in the design drawings does not match the actual site, and the construction cannot be carried out according to the drawings. Because the same engineer carries out similar subway monitoring projects, there are usually two kinds of results, one is smooth completion, the other is delay and shutdown. Where is the problem? After exploration, the author thinks that the biggest reason is that the risk assessment before the project is undertaken is not done well. The following problems are the most: the feasibility risk of the system-the planning is often inconsistent with the site requirements; Construction technical difficulty risk-lack of prior investigation; The risk of poor equipment quality-the most common risk is the risk caused by the substitution of inferior goods; The owner's bad environmental risk-special environment often gives engineers some tests and expenses; Engineering safety risk-the theft of cable equipment and tools is no longer news. Entering the stage of project implementation is the beginning of a lot of engineering problems. The two aspects discussed above are both conceptual and transactional problems. When entering the stage of construction implementation, practical and technical unexpected problems begin to be tested by engineering managers. Before the implementation of the project, the equipment entering the site failed to pass the subway monitoring. According to the normal practice, the equipment should enter the site first to obtain the confirmation from the owner or the supervisor, and the project equipment should be paid first to deal with the cash flow of the manufacturer. If this problem is not handled properly at this stage, it will affect the whole project progress and overall operation. Therefore, the equipment entering the site must not be neglected, and it should be checked item by item according to the details of the bid list or the materials submitted for approval, and then enter the site after obtaining the confirmation from the owner and the supervisor, so as to ensure that the construction equipment is correct. Engineering executives prepare equipment and materials for the subway monitoring project, which is located in a remote geographical location. It is a common problem for workers to prepare mechanical equipment insufficiently, prepare materials incompletely or make omissions when performing construction. The reason for this situation is that technicians usually memorize equipment and materials by experience, so omissions will occur, and if the engineering supervisor fails to fulfill the responsibility of reconfirmation. This kind of thing seems to be a trivial matter, but don't ignore the possible impact. The tools don't have neat materials, and the location of the construction site is far away. There is nothing to do. If you can buy them nearby, it will increase the cost. If you don't, it will delay the construction period and increase the cost. Interfaces such as pipelines and lines on site cannot match. At present, subway projects are usually contracted by several subcontractors. Therefore, in project execution, there are often many problems between interfaces due to insufficient coordination between subcontractors or failure to carry out construction work with the same set of drawings, which leads to waste of materials, delayed work, disordered manpower scheduling, and losses and extra expenses. Therefore, the person in charge of the project must coordinate the horizontal and vertical interfaces of the construction site during the operation of the project, and compare the construction with the same set of drawings to avoid this problem. Standardization of construction details in project execution During construction, subway monitoring engineers must have standardized operation procedures and methods. These methods are usually accumulated by some experienced technicians. Unless there are standard requirements in the construction plan or contract specifications, they are all implemented by the engineers according to their own technical standards. However, under the standardization of engineers, many engineers and technicians have no strict requirements on the construction details of security equipment, including subcontractors. Therefore, there are many ways to fix lines, different aesthetics in joint practices, and different standardization of line colors. Especially in power, network and control line coding, those who have not been exposed to formal electrician laws and have not obtained certificates are prone to make mistakes. Although it seems to be a very simple matter, the engineering details are so critical. Many engineers have paid for reconstruction and replacement on these issues. According to the author's experience, the loss caused by seemingly minor problems is the invisible killer that the project can't make a profit. The standardization of project execution details and the perfect attitude of technical personnel's re-education are the best solutions. Project execution safety and program management. In the execution of project management, the first thing that subway monitoring engineers pay attention to is site safety management and program arrangement. Many times, construction workers don't pay attention to the sequence arrangement of work items. In the actual construction process, the staff will freely arrange the sequence or give priority to the difficulty according to the difficulty of work and interface coordination. The most common thing is to install the main cabinet equipment first, and then find that the line can't get into the cabinet, so they have to unload the equipment first. In some cases, the preset homework is overdone, and it is only when we arrive at the scene that we have to do it step by step, so we can't speculate at all. Therefore, only by doing a good job in engineering installation management can we get twice the result with half the effort, otherwise, the operators may be punished and may also bring goodwill losses to the engineers. It is necessary to record the project. In the subway security monitoring project, we often see supervisors shuttling around the construction site with cameras and notebooks. Usually, people think that taking photos is just the supervisor's job and may be the owner's request for process records. However, the work of taking photos and recording is strictly required in public engineering operations. If it is a private security system, it is the archive of several business personnel of the engineering company. In many engineering cases in the past, the construction technicians regarded taking photos as a big chore, and there was no reason for it: it was really troublesome for a technician who carried out the project just because he had to keep the camera and work at all times, because the construction process was non-stop, so there was often a problem of missing photos in some stages. Some people will ask, is the photo record really that important? Important! It is very important. In the past, when several public projects were controversial, photo records helped many manufacturers and owners clarify their problems and responsibilities. In the engineering experience, the author also saved a lot of time to explain, clarify and confirm by relying on complete records and photos, as well as the difficult problem of providing evidence afterwards, which left more time for management in the workplace. Conclusion The above problems are all possible problems in the execution of the subway monitoring project. The author condensed them into several outlines, but the problems in the execution of the project are the most, which is definitely not something that the author can completely cover in a few words. I believe that everyone in charge of the project and the project can definitely feel it, so it is necessary to be cautious in dealing with the problems in the execution of the subway monitoring project, and at the same time actively deal with them to maximize the benefits of the execution of the subway monitoring project.