Seismic bracing and support systems are抗震 support systems used to protect building mechanical and electrical engineering facilities (pipes, ducts, cable trays, equipment, etc.). During an earthquake, they withstand horizontal seismic forces, preventing lateral sway, longitudinal displacement, and falling of pipelines, ensuring that lifeline systems such as fire protection, water supply, and power supply remain operational after an earthquake. According to the "Code for Seismic Design of Mechanical and Electrical Equipment in Buildings" GB50981-2014, buildings with a seismic fortification intensity of 6 degrees or above must undergo seismic design for their mechanical and electrical engineering systems.

According to GB50981-2014, seismic bracing supports shall be provided in the following cases: ① Equipment in suspended piping with a gravity load greater than 1.8 kN; ② Domestic water supply and fire protection piping systems with a nominal diameter above DN65; ③ Air duct systems with a rectangular cross-section ≥ 0.38 m² or a circular diameter ≥ 0.7 m; ④ Electrical conduits with an inner diameter ≥ 60 mm and cable trays or busways with a gravity load ≥ 150 N/m; ⑤ Gas pipelines with an inner diameter ≥ 25 mm; ⑥ Smoke exhaust ducts, emergency ventilation ducts, and related equipment (mandatory provision).

Classified by support direction into three types: lateral support (diagonal brace perpendicular to the pipe axis, preventing lateral sway), longitudinal support (diagonal brace parallel to the pipe axis, preventing longitudinal displacement), and bidirectional/four-way support (combination of lateral and longitudinal). Classified by structure into single-pipe supports, multi-pipe supports, portal supports, etc. The installation angle of the diagonal brace should be 45°, and must not be less than 30°.

Primary implementation: GB50981-2014 "Code for Seismic Design of Mechanical and Electrical Installations in Buildings," CECS420:2015 "Specification for Installation and Acceptance of Seismic Supports and Hangers," and CJ/T476-2015 "General Technical Conditions for Seismic Supports and Hangers for Mechanical and Electrical Equipment in Buildings." The product shall be accompanied by quality certification documents, including type inspection reports and shaking table seismic simulation test reports.

Single-pipe unidirectional support market reference price is approximately 160–300 RMB/set (depending on pipe diameter, specifications, galvanized layer thickness, and project scale). The overall cost is influenced by seismic fortification intensity, pipeline density, and the complexity of detailed design. It is recommended to quote based on engineering quantity (kg/set) after project-specific detailed design for greater transparency and control.

Standard arrangement: Lateral seismic bracing spacing is 12m, longitudinal seismic bracing spacing is 24m, and load-bearing support spacing is 3m. Each section of horizontal straight pipe should have lateral supports at both ends, with at least one longitudinal support; lateral supports should be installed within 0.6m of bends. Follow the design drawings for specific details.