1 The design of gas pipeline in high-rise residence should deal with the influence of foundation settlement. In the design of high-rise residential gas pipeline, in order to enhance the rationality of pipeline design, we should strictly abide by the requirements of industry technical specifications and combine the functional characteristics of high-rise residential gas pipeline to improve the design scheme of gas pipeline. In order to avoid gas leakage accidents, attention should be paid to the influence of foundation settlement of high-rise residential buildings. Firstly, the compensator is set reasonably to optimize the working performance of the intake pipe in long-term use and ensure its working stability; Secondly, through the in-depth analysis of high-rise residential buildings, combined with the advantages of computer network and information technology, the foundation settlement in its area is determined, and the compensation amount of compensator in air inlet pipe setting is clear; Thirdly, the specific position of the compensator is reasonably selected, and a ball valve with reliable safety performance is installed in the air inlet direction, which provides convenience for operation and prolongs the service life of the gas pipeline.
1.2 Handling the influence of additional pressure. Whether the pressure of gas pipeline in high-rise residence can be controlled within an effective range is related to the stability of gas combustion, which may lead to flashover, flashback and other problems and increase the incidence of gas pipeline safety accidents. In order to avoid this kind of accident, attention should be paid to the design of additional pressure in the design of gas pipeline in high-rise residential buildings. Firstly, according to the pipeline setting in high-rise residence and the scale of users, the resistance of gas pipeline and the value of pressure gauge are analyzed to determine the best gas pipeline pressure to ensure safe use. If the maximum gas consumption point of gas pipeline in high-rise residence is kept at about 125m, the burner pressure should be controlled within the range of 3000kPa; Secondly, in order to ensure the gas supply stability of the gas pipeline, it is necessary to analyze the fluctuation range of burner pressure in high-rise residential buildings, appropriately reduce the diameter of the riser, increase the pipeline resistance through layered diameter change, and avoid the excessive influence of additional pressure on the riser.
Effect of 1.3 on temperature difference of gas riser. Affected by factors such as thermal expansion and cold contraction and self-weight. The working performance of gas risers in high-rise residential buildings may be reduced. In the process of designing pipeline fixing and pipeline compensation, the possible influence of temperature difference of gas riser should be considered. Firstly, the thermal expansion and cold contraction of gas pipeline are analyzed, and the influence of temperature difference is considered to provide reference for the reasonable installation of gas riser. Secondly, according to the expansion coefficient of gas pipeline materials, the appropriate pipeline is determined, and the installation process is optimized, so as to reduce the failure rate of gas risers by affecting the temperature difference during installation under different temperature conditions.
2. Key points of gas pipeline construction design in high-rise building 2. 1 Influence of high-rise building settlement on gas pipeline. Causes of damage to gas pipeline caused by building settlement. The main reasons for the settlement of high-rise buildings are as follows: first, there will be different degrees of settlement after the completion of the building, and the settlement of the building will affect the quality of the intake pipe. When the building sinks, the intake pipe is static and bears the shear stress of the building. When the shear stress exceeds the tolerance range of the intake pipe, the pipeline will rupture and the gas will leak. Secondly, at present, the company's high-rise design adopts the user's internal riser installation method, which is introduced indoors from 0. 1m below the first floor roof. When the gas pipeline in a high-rise building is introduced into part of the pipeline construction, it is required to excavate the gas pipeline from the outlet of the pressure regulating box to the ground in front of the building to below the ground elevation 1.5m or more. At this time, if the original foundation strength is not enough or the gas construction unit does not do a good job of backfilling, some gas pipelines will be stretched after being put into use, even affecting the overhead riser, causing gas leakage and affecting the safety of people's property and public facilities. Therefore, when designing gas pipelines in high-rise buildings, reasonable solutions should be taken to reduce the damage caused by building settlement, and effective measures should be taken to prevent the settlement caused by the dead weight of gas pipelines.
2.2 The influence of pipeline additional pressure and its control method. Due to the continuous development of high-rise buildings, the height of gas pipelines has also increased. The pressure change of additional gas should be fully considered in the design. The pipe diameter is determined by strict and meticulous hydraulic calculation. In hydraulic calculation, different friction resistance coefficients correspond to different pipe diameters. Designers are required to carefully calculate the gas users with differences, change the diameter of the indoor riser according to the hydraulic calculation table, select the appropriate diameter, and reduce the weight of the overhead pipeline, which can also reduce the waste of materials and ensure the safe and normal gas use of residents.
3 Indoor safety measures for gas pipelines in high-rise buildings: First, install gas leakage alarms in users' rooms, and install centralized signal collectors in residential property offices. If there is a gas leak in the user's room, the alarm will call the police immediately and the property office will get feedback. Property personnel will inform the gas company to close the valve in time to reduce the occurrence of safety accidents. Second, in the process of installing the indoor gas pipeline, try to design an emergency automatic cut-off valve in front of the gas meter and connect it with the gas leakage alarm system. In case of gas leakage or safety accident, the emergency automatic cut-off valve in front of the instrument will immediately cut off the gas supply, reducing the damage rate of personnel and property. Three, improve the management of gas pipelines in high-rise buildings, regularly check and maintain gas pipelines and other gas equipment in high-rise buildings, and preach gas safety knowledge to users. Residents should consciously safeguard the safety of gas facilities, open the window in time in case of leakage, and ensure the normal operation of gas pipeline equipment to the maximum extent. Construction technology of gas pipeline in high-rise residence 4. 1 gas inlet pipe construction technology. In order to effectively connect the indoor and outdoor gas pipelines of high-rise residential buildings, the gas intake pipe should be used correctly, its construction scheme should be implemented, and relevant construction technologies should be used reasonably.
4. 1. 1 ground introduction mode. Introduction above ground can be divided into two ways: high riser and low riser. Reasonable selection should be made according to the actual situation. When the gas pipeline is installed on the ground, its safety protection should be strengthened to ensure that its normal use is not affected. 4. 1.2 underground introduction mode. If the gas pipeline goes through the house, we should pay attention to the underground introduction of the gas pipeline, control the distance between the gas pipeline and the ground, and cooperate with the use of casing.
4.2 gas riser construction technology. Combined with the requirements of gas pipeline laying in high-rise residential buildings, the use of gas riser construction technology should be strengthened. First, pay attention to the reasonable installation of the union on the gas pipeline and select the gasket with reliable performance; Secondly, when installing underground gas pipeline, the flange connection mode should be correct, and the welding quality of the pipeline should be checked, and the double-sided welding mode should be used in cooperation; Thirdly, according to the functional characteristics of gas riser, the construction scheme of high-rise residential quarters is selected to strengthen the control of gas pipeline diameter and clear distance.
4.3 Test of gas pipeline. After the construction scheme of gas pipeline in high-rise residence is completed, the corresponding strength and tightness test should be carried out for the gas pipeline. First, during the test, the gas pipeline should be purged to ensure the effectiveness of the strength test; Secondly, considering the design pressure between the inlet master valve and the ground master valve, the control of the test pressure should be strengthened according to the actual size of the design pressure; Thirdly, when testing the tightness of gas pipeline, the main inlet valve and the main valve in front of the meter should be tested before ventilation, and the testing pressure should be controlled at about 7kPa. After ventilation, the test should be carried out in front of the main intake valve and burner valve, and the test pressure should be controlled at about 3kPa to ensure the rationality of gas pipeline setting.
Conclusion The design and construction technology of gas pipeline are analyzed, which makes the use function of high-rise residential buildings more perfect, meets the needs of users and accumulates more experience for the construction of modern high-rise residential buildings. In the future, we should pay attention to the scientific design of gas pipeline in high-rise residential buildings and comprehensively evaluate the application effect of its construction technology, so that the gas pipeline can meet the requirements of high-rise residential buildings and ensure the reliability of service performance.
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