How to ensure that the building does not collapse in an avalanche during an earthquake, to ensure that the structure does not collapse during the earthquake, and to minimize the casualties and economic losses of the building structure caused by the earthquake has become the top priority of the current research on earthquake resistance. . The electrical and mechanical seismic resistance of buildings plays a vital role in the seismic resistance of the overall building structure, and the seismic support is an indispensable part of the building electrical and mechanical seismic engineering.

1. What is the mechanical and electrical seismic resistance of buildings?


The mechanical and electrical seismic resistance of buildings refers to the seismic resistance of electrical and mechanical facilities such as pipes, air ducts, and cable trays. In layman's terms, it is the seismic measures of the "hydroelectric and wind" system. At the very beginning, the main load-bearing function of the protection of electromechanical facilities in China was basically without considering the seismic design, which brought great hidden dangers to the safety of the system. The "Code for Seismic Design of Building Mechanical and Electrical Engineering" specifies the measures and technologies that should be adopted, which are defined as seismic support systems. On the basis of load mechanics and the earthquake action check calculation as the core, the electromechanical facilities such as pipes, air ducts, and cable bridges are firmly connected to the seismically designed building to limit the displacement of the electromechanical engineering facilities, control the vibration of the facilities, and transfer the load to the load. Various structural components or devices. The main purpose of its seismic support is safety, that is, to minimize the loss of life and property caused by the earthquake. In layman's terms, this type of product is also called seismic support and hanger.

2. What is a seismic support?


Definition: An earthquake-resistant support facility that is firmly connected to the building structure and takes seismic force as the main load. It is composed of anchors, reinforced booms, seismic components and seismic braces.

3. Which systems do seismic supports?


According to the relevant standards of GB 50981-2014 Code for Seismic Design of Building Mechanical and Electrical Engineering:

(1) Domestic water supply system and fire-fighting piping system: Metal pipes with a pipe diameter ≥ DN65 shall be designed for seismic supports and hangers. (2) Air duct systems: anti-fume exhaust ducts, accident ventilation ducts and related equipment should adopt earthquake-resistant supports and hangers, and anti-fume exhaust ducts and accident ventilation ducts should be designed with anti-seismic supports regardless of their size. (Strong strip) Air-conditioning ventilation duct: Rectangular duct cross-sectional area ≥ 0.38 square meters or circular duct diameter ≥ 700 should be designed for seismic support and hanger. (3) Electrical system: Electrical piping with an inner diameter of not less than 60mm should be designed for seismic support. Bridges and bus ducts with a gravity of not less than 150n/m (15KG/M) should be designed for seismic support. (4) Gas system: Gas pipelines with an inner diameter greater than or equal to 25MM should be designed for seismic resistance.

4What are the materials of the seismic support? What are the pros and cons?


Q235B is generally used in the market. There are electro-galvanized and hot-dip galvanized. The electro-galvanized coating is thinner and the hot-dip galvanized coating is thicker. At present, most of the brackets are hot-dip galvanized (the thickness of the galvanized coating is generally 70~ 80μm), the accessories are electroplated (the galvanized layer is generally a few μm).

Some manufacturers use other materials, such as zinc-aluminum-magnesium profiles, which have better anti-corrosion performance, but they are also more expensive.

5. Will the seismic support affect the net height?


The seismic support at the integrated pipeline will definitely affect the height of the pipeline arrangement. If the site construction unit does its own work, the net height in the later stage will not be controlled. Therefore, it is necessary to deepen and optimize the seismic support at the early stage, especially for the integrated pipeline. , A comprehensive seismic support should be used.

6. What is the acceptance method of seismic support?


The current acceptance department is the quality inspection station!

Acceptance method: compare the design drawing with the actual installation situation on site. Individual projects may require destructive testing. At present, most of the projects actually implemented systems: ventilation, water supply, fire hydrant, sprinkler, and electrical system to prevent smoke and exhaust accidents. (The gas is generally made by the gas company). Among them, for the prevention of smoke and exhaust accident ventilation, some previous projects only did this part, but there were also feedbacks that other systems were added at the later acceptance site, and the specific local requirements shall prevail.