What are the specific contents of the problems that should be paid attention to in HVAC construction? The following Zhong Da Consulting will answer your questions.

The construction of HVAC project mainly refers to the installation of heating, air conditioning and ventilation system, and the work content is relatively complicated. Construction of HVAC engineering HVAC engineering includes heating, air conditioning and ventilation system, and its installation is complicated. After the completion of the pile foundation project, the construction of HVAC project began to be embedded and reserved. After the completion of the main construction of the building project, the system installation of the HVAC project will begin. In order to ensure the installation quality of HVAC engineering, it is necessary to fully study and analyze the installation drawings during the construction process, determine the construction scheme according to the actual situation of the engineering building structure, and comprehensively control the possible quality problems during the construction process. The following article analyzes and discusses some problems that need special attention to ensure the construction quality in HVAC engineering construction.

1 Strictly control the quality of HVAC building materials.

The main building materials involved in HVAC construction include pipes, pipe fittings and radiators. Quality control of building materials is the premise to ensure the quality of engineering construction. Therefore, when building materials enter the site, no matter who is the purchasing subject of the materials, they must go through strict quality inspection procedures before entering the site, and must ensure that they have the factory certificate and product quality certificate issued by relevant departments. At the same time, the engineering construction technicians must also conduct a comprehensive acceptance of the model and specific specifications of the materials, and determine and meet the engineering construction standards before allowing the materials to enter the site for unloading. Because HVAC engineering construction usually needs a large number of building materials, and the materials often enter the site in batches, it is necessary to carry out quality inspection and acceptance of the materials entering the site in batches one by one in HVAC engineering construction. Only in this way can we ensure that the quality of incoming materials does not meet the construction quality standards of HVAC engineering.

Valves play a very important role in HVAC pipeline engineering system. If there is a problem with the valve quality, it will seriously affect the function of the whole HVAC pipeline engineering system. Therefore, when checking the quality of HVAC engineering materials, the quality of valves must be strictly checked. After all kinds of materials in HVAC engineering construction enter the site, it is necessary to set up a special site to store HVAC equipment, and special personnel are responsible for the storage and import and export management, so that the packaged HVAC equipment will not be affected by external unfavorable factors during storage and ensure the normal performance of materials.

2 in the process of HVAC engineering construction, the quality of engineering construction is fully controlled.

In the process of engineering construction, it is necessary to find the slope of the main heating pipe to avoid uncomfortable slope. Usually, the main reasons for this situation are concentrated in two aspects: on the one hand, because the pipeline is not straightened during installation, the slope requirement of pipeline installation is ignored during construction; On the other hand, due to the failure to effectively set the pipeline support during pipeline installation, the elevation of the support does not meet the engineering construction standards, resulting in local depression or bulging of the pipeline. The appearance of this situation will lead to the gentle local slope of the pipeline, which is easy to accumulate water and water during the use of the pipeline, which is not conducive to the full play of the normal function of the system. In order to effectively solve this problem, the first choice is to straighten the pipeline in advance, and at the same time try to keep the elevation of the support reasonable and effectively control the spacing of the support. Finally, when plugging the hole in the wall, be careful not to force the hard pad, and it is not appropriate to change the original slope of the pipeline and the slope of the main and branch pipes, thus solving the problem.

In the heating installation project, it is still common to mix the fixed bracket with the movable bracket or use one bracket, which will make the pipeline unable to expand and contract in the predetermined direction, resulting in damage to the bracket and pipeline; Too small material will cause the bracket to bend down or damage, and the normal work of the system will be affected when the pipeline bends down seriously. Also, replacing the horizontal pipe clamp with the vertical pipe clamp will also cause the pipe to fall, which can not be ignored. To solve this problem, it is necessary to strengthen the education of construction quality awareness, distinguish the difference and different functions between fixed support and sliding supports, make correct selection in construction, and construct according to the drawings to prevent the occurrence of problems.

The position of the supervisor and riser is not allowed, and the coordinates and elevation of the radiator are not accurate. The inaccurate position of the main pipe and riser is mainly caused by measurement error, followed by the deviation of the central axis of civil construction. In order to solve this problem, it is necessary to choose accurate measuring tools instead of error-prone tools in construction, and to measure on site instead of on drawings, and to cut materials according to the situation of on-site measurement. The coordinates of the radiator are inaccurate, mainly in the large and small distance from the wall; Elevation is not allowed to be mainly manifested in the elevation difference in the same place, which exceeds15 mm. Before installation, draw a unified elevation line to ensure the consistency of elevation.

3 coordination with other types of work.

In a multi-functional building, the ceiling clearance is limited, and the layout of various professional work is complicated. Such as: air supply duct, air return duct, fresh air duct, smoke exhaust (wind) duct, water supply duct, air return duct, condensate pipe, etc. For HVAC major; Strong and weak current bridge, bus duct, electric conduit, etc. For electrical majors. At present, in many HVAC construction drawings, designers only give the positioning dimensions of main equipment, but do not indicate the positioning dimensions and elevations of air ducts and water pipes. Or even if there is a size, it conflicts with other types of work, because some drawing design institutes have never signed it at all, which brings a lot of inconvenience to construction. At this time, it is necessary to coordinate between various types of work, and if necessary, it can be solved by the owner or supervision unit.

4. Comprehensive treatment of common quality problems existing in HVAC engineering construction.

In view of the serious air leakage caused by insufficient contact between the air duct and the flange, effective control should be carried out, and the close combination between the air duct and the flange must be ensured when they are installed together. In addition, when installing ventilation equipment, it is often done too early because the installation surface of air duct is uneven or the installation angle is not conducive to the smooth installation work. This situation not only affects the external perception of air duct installation, but also is not conducive to the installation quality of air duct. Therefore, this situation must be avoided as much as possible in the process of engineering construction and installation. In HVAC engineering, the problem of water pipe leakage is usually because the combination between water pipe, pipe fitting and valve is not close enough, and hemp fiber does not make the valve and pipe or pipe and pipe fitting elbow fully contact, so the joint of HVAC engineering must be padded to avoid water leakage. In the process of HVAC engineering construction, valve installation should be effectively controlled to avoid valve installation errors as much as possible. When installing, carefully determine the specific positions of the fire valve and the smoke exhaust valve to avoid the problem of reverse installation of the valves as far as possible. When installing valves, manual valves often cannot be installed in the opposite direction. The main reason for this problem is that the valve installer did not clearly understand the direction of valve installation, which led to the installation error. Therefore, in order to ensure the installation quality, it is necessary to comprehensively improve the overall quality of the installation team and ensure the smooth progress of the installation project. In addition, in the use of HVAC engineering, the water pipes of air-conditioning occasionally have dripping and water seepage problems, mainly due to the thermal insulation performance. The main reason is that there is no wooden pad installed on the air-conditioning bracket, which is caused by the cold bridge phenomenon.

5 abstract

In order to effectively control the construction quality of HVAC engineering, ensure the good performance of heating, ventilation, water supply and drainage of building engineering in China, and comprehensively improve the overall performance of building engineering, effective measures must be taken to comprehensively prevent and control various quality problems that may occur during the construction of HVAC engineering. At the same time, with the increasing abundance of HVAC products in China, the HVAC installation team in China will continuously improve the installation ability, and lay a solid foundation for ensuring the installation quality of HVAC projects with high-level installation technology and installation ability.

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