Key points for installation and operation of anti-seismic support
Oct 19, 2021
(1) Longitudinal deviation of pipes and wire casings is allowed, but not more than 1/6 of the large lateral support spacing; the deviation of air ducts is allowed, but not more than 2 times the air duct demeanor.
(2) When the horizontal pipeline turns at 90°, seismic supports and hangers are required; when the turning length of other angles is greater than 1/16 of the seismic design interval, lateral and longitudinal seismic supports and hangers are required.
(3) When calculating the horizontal seismic load, only the full load weight is required and no other factors need to be considered.
(4) The anti-seismic hanger does not limit the stress caused by the thermal expansion and contraction of the pipeline. When the thermal expansion and contraction factors are taken into account, the longitudinal hanger should be considered in the selection of components. The selected model should be able to resist the thermal expansion and contraction of the pipeline. stress.
(5) The pipe size of the seismic hanger of the insulated pipeline should be considered according to the size after the insulation, and the door hanger used for the insulated air pipe and water pipe should also be considered according to this.
(6) Seismic support for rigid pipelines cannot be installed in different structural or functional parts of the building, otherwise different displacements will occur due to earthquakes.
(7) Single-pipe seismic support bidirectional lateral or longitudinal or inflection point seismic support with lateral/longitudinal action shall be directly connected to pipelines or wire casings. It should be noted that the support of the branch pipe or the lower-level pipeline cannot be used as the seismic support of the main pipe, that is, it cannot be used as the support of the other direction (main pipe).
(8) When the pipeline passes through the settlement joint of the building, the settlement displacement design should be considered.
(9) The best vertical angle for installation of side/longitudinal diagonal brace is 45°, which can be adjusted appropriately according to the actual situation on site.
(10) For single-pipe or multi-pipe shared portal hangers for water, electricity, and wind systems, regardless of lateral/longitudinal diagonal bracing, the bearing capacity will not be affected when the diagonal brace deviates from the centerline by 2.5°.
