What are the forms of seismic support hangers? Where is it used?
In the mechanical and electrical engineering of construction, the seismic support and hanger has begun to be used compulsory, but many engineering friends are still relatively unfamiliar with this, because the seismic resistance of the electromechanical is basically not considered in the design of the building, and the seismic support and hanger have never been used. But the situation is different now. The construction electromechanical industry has a national standard in the field of earthquake resistance, which clearly stipulates the setting and design of seismic support.
Based on the following questions
Make a carding for the anti-seismic support and hanger
· What is the basis for setting the seismic support and hanger?
· What is an anti-seismic support hanger?
· What are the common forms of seismic support hangers?
· Where should anti-seismic supports and hangers be used?
What is the basis for setting the seismic support and hanger?
According to the national standard GB50981-2014 "Code for Seismic Design of Building Mechanical and Electrical Engineering" issued by the Ministry of Housing and Urban-Rural Development in 2015, the design and use of seismic support and hangers are clearly specified. The standard has been implemented since August 1, 2015, which also means that the construction mechanical and electrical engineering must consider the seismic support and hanger since then.
What is an anti-seismic support hanger?
Seismic support and hanger is a support and hanger product used to support electromechanical pipeline equipment such as water pipes, air ducts, bridges, etc. and provide seismic support. According to GB50981-2014 "Code for Seismic Design of Building Mechanical and Electrical Engineering", the definition of seismic support and hanger is a seismic support facility that is firmly connected to the building structure and takes seismic force as the main load. It consists of anchors, reinforced hangers, seismic connecting members and seismic diagonal braces.
What are the common forms of seismic support hangers?
According to GB50981-2014 "Code for Seismic Design of Building Mechanical and Electrical Engineering", the seismic support and hanger is composed of anchors, reinforced hangers, seismic connecting components and seismic diagonal braces. All components that make up the anti-seismic support and hanger should be finished components, and the structure of the connecting fasteners should be easy to install.
Lateral seismic support hanger
To resist lateral horizontal seismic force.
Longitudinal seismic support hanger
It is used to resist the longitudinal horizontal seismic force.
Single tube (rod) seismic support hanger
It is an anti-seismic support hanger composed of a load-bearing hanger and an anti-seismic diagonal brace.
Door type seismic support hanger
The anti-seismic support and hanger composed of two or more load-bearing hangers, beams and anti-seismic diagonal braces.
Where should seismic support hangers be used?
According to GB50981-2014 "Code for Seismic Design of Building Mechanical and Electrical Engineering":
Article 1.0.4 (Strong Article) stipulates that the mechanical and electrical engineering of buildings in areas with seismic design intensity of 6 degrees and above must be seismically designed.
Article 3.1.6 stipulates the content that needs to be seismically fortified: ① the equipment in the suspension pipeline with a gravity greater than 1.8kN; ② the domestic water supply and fire fighting pipeline system above DN65; ③ the rectangular cross-sectional area is greater than or equal to 0.38㎡ and the circular diameter Air duct system greater than or equal to 0.7m; ④ For electrical piping with inner diameter greater than or equal to 60mm and cable ladders, cable trough boxes and bus ducts with gravity greater than or equal to 150N/m.
Article 3.1.8 stipulates that the construction mechanical and electrical engineering pipelines passing through the seismic isolation layer shall adopt flexible connection or other methods, and shall be provided with anti-seismic supports on both sides of the seismic isolation layer.
Article 188.8.131.52 stipulates that anti-vibration measures should be taken when the linear length of the water supply and drainage risers of high-rise buildings in the 8-degree and 9-degree areas is greater than 50m; when the linear length is greater than 100m, anti-vibration measures should be taken.
Article 184.108.40.206 stipulates that the indoor water supply, hot water and fire-fighting pipelines whose diameter is greater than or equal to DN65 horizontal pipelines shall be provided with anti-seismic supports when they are fixed by hangers, brackets or brackets.
Article 220.127.116.11 stipulates that the pipes in the boiler room, refrigeration machine room and heat exchange station shall have reliable lateral and longitudinal seismic support. For multiple pipes sharing a support and hanger or a single pipe support and hanger with a pipe diameter greater than or equal to 300mm, a portal-type seismic support and hanger should be used.
Article 18.104.22.168 stipulates that anti-seismic supports and hangers can be used for air ducts with a rectangular cross-sectional area greater than or equal to 0.38m2 and a circular diameter greater than or equal to 0.70m.
Article 5.1.4 (Strong Article) stipulates that anti-seismic support and hangers should be used for smoke prevention and exhaust ducts, accident ventilation ducts and related equipment.
Article 22.214.171.124 stipulates that the air-conditioning units, fans and other equipment with a gravity greater than 1.8kN should not be installed by hoisting. When it is necessary to use hoisting, it should be avoided to be located above the positions of personnel activities and evacuation passages, but anti-seismic supports and hangers should be installed.
Article 6.1.1 stipulates that gas pipelines with an inner diameter greater than or equal to 25mm shall be designed for earthquake resistance, and the settings of pipeline seismic support and hangers shall comply with the regulations.
Article 6.2.8 stipulates that in a building with a building height greater than 50m, the gas pipeline shall be provided with seismic supports at appropriate intervals according to the seismic requirements of the building.
Article 7.1.2 stipulates that the electrical piping with an inner diameter of not less than 60mm and the cable ladder frame, cable trough box and bus duct with a gravity of not less than 150N/m should be seismically fortified.