Lateral Seismic Restraint For Pipes

This component is responsible for securely fastening the seismic bracing system to the building's primary structure, whether it be a concrete slab, wall, or structural steel beam. Common anchorage methods include high-strength "undercut mechanical anchors" or "chemical anchors" embedded in concrete, and "beam clamps" fastened to steel beams. The reliability of the anchorage points directly determines the effectiveness of the entire seismic system and serves as the starting point of the load path.

Serving as the "skeleton" of the system, these members are the core rigid components that directly withstand and transfer lateral seismic loads. They primarily include "C-channel struts" and "seismic brace rods" (or "sway braces"). The C-channel struts often function as supporting rails, while the adjustable-length seismic brace rods, with their high stiffness, are specifically designed to resist the lateral sway of the pipes, acting as the main bridge transferring forces from the pipe to the anchorage points.

This part functions to tightly connect the pipe itself to the supporting structure, typically achieved using various "pipe clamps" or "pipe rings." For insulated pipes, "insulated pipe clamps" with a larger inner diameter or special design are used to securely hold the pipe without crushing the insulation. When seismic forces act on the pipe, they are first transferred to subsequent components through this interface.

Various connectors act like the joints of the system, ensuring smooth and complete force transfer. For instance, "strut nuts" can be locked anywhere along the C-channel strut, providing flexible connection points; "3D connectors" are used to handle complex multi-directional loads; and "swivel connectors" (or "seismic hinges") allow the brace rod to pivot within a certain angle, accommodating thermal expansion and contraction while preventing undesirable bending moments during an earthquake, thus protecting other components.

This category includes smaller yet crucial parts that ensure the system's durability, safety, and functionality. For example, a "stiffener plate" is a small steel plate welded to the strut to prevent local deformation at points of high stress. A "limit stop" is a clever device that permits the pipe to move freely under normal conditions (like thermal expansion) but engages to restrict movement within a safe range if seismic displacement exceeds allowable limits.