With the continuous progress and development of society, it is a brand-new era for China to fully realize informationization, industrialization and high technology. Housing is the foundation for human beings to live and work in peace. Therefore, HVAC engineering has attracted more and more attention from all walks of life. At this point, it will bring us a substantial increase in production efficiency and the stability and progress of social development. After engaging in HVAC construction management for a period of time, we will find that there are some problems in various projects to varying degrees. Key points in the construction of building ventilation engineering In the construction of building HVAC engineering, the construction must be carried out in strict accordance with the relevant provisions of the state, and the construction quality of HVAC engineering must be ensured through on-site monitoring by professional and technical personnel. In order to improve the management level of HVAC construction, it is necessary to master the problems that will occur in construction management and solve them in the construction process, so as to better implement HVAC construction and be foolproof.
1. Production management of HVAC construction
In the production management of HVAC construction, the first thing to pay attention to is the management of materials. There are many specifications and varieties of materials used in air conditioning engineering, among which plates, pipes and insulation materials are all materials with large consumption and consumption coefficient. Good or bad management has a direct impact on the consumption of materials. It is very important to coordinate the relationship between supply and demand and strengthen material management, especially to use consumption coefficient to calculate material consumption. Our company will focus on strengthening the control of material consumption. Specific management measures are as follows: For materials with consumption coefficient such as plates, pipes, profiles and insulation materials, professional engineers are responsible for counting the number of finished products and actual materials every week, accounting the material consumption coefficient, analyzing the causes of excessive consumption in time and taking targeted measures to control consumption; For other materials with a specific quantity, take the method of limited acquisition and regular tracking to find the shortage and loss of materials in time.
At the same time, various valves play an important role in HVAC pipeline engineering system. All kinds of equipment used in HVAC engineering, especially large pipes, fittings, radiators and other major bulk materials, must have factory certificates that meet national requirements, and the types, specifications and performance of materials meet relevant national standards and the design requirements of this project. All kinds of materials, accessories and equipment should be strictly accepted when they enter the site. When all kinds of equipment enter the site for acceptance, check whether the three certificates are complete. Before installation, the strength and leak test shall be carried out in strict accordance with the requirements of the construction acceptance specification, and it can be used only after it is qualified. All unqualified products are not allowed to enter the market, let alone be used. The other is the management of HVAC construction personnel. It is the most important link in construction management to plan, organize, command, supervise and dispatch the labor force reasonably, fully mobilize the enthusiasm of workers and maintain high labor efficiency.
2. Talking about HVAC construction management
In the heating construction project, it is common to mix fixed support with movable support or use one support, which will make the pipeline unable to expand and contract in the predetermined direction, resulting in damage to the support 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. In order to solve this problem, we should 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 carry out construction according to the drawings to prevent the occurrence of problems. At the same time, in the installation of pipes and radiators, painting is generally the last process. Because the branch pipe and radiator are close to the wall, it is difficult to operate, which often causes the paint on the side of the pipe against the wall and the back of the radiator to be brushed or uneven. In order to solve this problem, we should change the process, brush the antirust paint and the first topcoat before installing the pipeline and radiator, and then brush the topcoat after installation. Special attention should be paid to these in the construction process, and the wrong coating type and construction technology must not be selected.
Secondly, the heat load of the heating system in winter should include the heat consumption of heating the cold air that seeps into the room through the gap between doors and windows. However, some projects do not calculate this part of the heat consumption when calculating the heating heat load, or in high-rise buildings, the room ventilation rate method is only suitable for calculating the cold air permeability of multi-storey buildings, which leads to great differences in heating heat load. According to the Code for Design of Heating, Ventilation and Air Conditioning, corrosion-resistant radiators should be used in rooms with high relative humidity. However, in many projects, there are no regulations for radiators used in public bathrooms and toilets. In the general description, radiators are all made of steel, and there is no emphasis on water injection maintenance in non-heating seasons. Steel radiator must pay attention to corrosion protection, and its corrosion is very serious in the environment with high relative humidity. Therefore, it is best to use cast iron radiator or aluminum radiator in this place. However, it should be noted that aluminum radiator and steel radiator should not be used in the same hot water system. In the hot water heating system with heat meter and thermostatic valve, it is not suitable to use the cast iron radiator with coarse sand in the water flow channel.
In addition, when setting the heating entrance, we should not only consider the rationality of the indoor heating system, but also consider the rationality of the connection with the outdoor pipeline, not just the convenience and speed of the indoor system design. But some projects have too many heating entrances. For example, in a multi-storey building, the indoor heating system is divided into four loops, and a heating entrance is also set. There are too many connection points between several directions and the perimeter, which not only brings trouble to the perimeter construction, but also brings inconvenience to the adjustment of the indoor system in the future. In some engineering designs, the air-conditioning condensate pipe is designed to be discharged to the nearest bathroom, while the air-conditioning condensate pipe is required to be discharged indirectly, so the exposed air-conditioning condensate pipe is often seen, which is not suitable for the decoration of high-end bathrooms. The condensate pipe of air conditioner is best designed to discharge centrally. If the horizontal pipeline is too long, it can be divided into several sections for centralized discharge, and drainage risers can be added and placed in water supply and drainage pipe wells. This can not only solve the above aesthetic problems, but also not affect the ceiling height of the walkway because of the laying of air conditioning condensate pipes.
3. Concluding remarks
In the HVAC engineering construction of modern civil buildings, due to the high level of buildings, the requirements for engineering ventilation system are getting higher and higher. Therefore, in the design and construction process of HVAC engineering, we should fully understand the common problems and strictly control the quality, so as to truly ensure the engineering quality within the design service life of the project.
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