How to arrange the steel frame portal rigid frame support and rigid tie rods?
★ (1) In each temperature section or the section constructed in stages, support systems that can independently form a spatially stable structure should be set up.
★ (2) In the bay with inter-column support, horizontal support of the roof should be set at the same time to form a geometrically unchanged system.
★ (3) The end support should be set in the first or second compartment of the end of the temperature section. The spacing between the supports between the columns should be determined according to the longitudinal force of the house and the installation conditions, generally 30 ~ 45m; when there is a crane, it should not be greater than 60m.
★ (4) When the height of the house is large, the support between the columns should be set in layers; when the width of the house is greater than 60m, the inner column should be properly set up for support.
★ (5) When the end support is provided in the second compartment of the end, a rigid tie bar should be provided at the corresponding position of the first compartment.
★ (6) At the turning point of the rigid frame (the top of the side column, the roof ridge and the top of the middle column of the multi-span rigid frame), rigid tie bars should be installed along the entire length of the house.
★ (7) For the horizontal truss composed of supporting inclined rods, the straight web rods should be considered as rigid tie rods.
★ (8) Rigid tie rods can be used as purlins at this time, purlins should meet the load-bearing capacity and rigidity requirements of bending members, when not satisfied, steel pipes, H-shaped steel or other cross-section rods can be set between the rigid beams.
The support of the steel structure of the portal-type light frame lighthouse should be supported by cross-shaped round steel. The angle between the round steel and the connected members should be close to 45 ° and not exceed 30 ° -60 °.
The round steel should be connected to the beams and column webs with special connectors, and be tensioned and fixed after correction and positioning. Tightening means is best to use flower basket screws. In the spans with bridge cranes with a lifting capacity greater than 15t, the support between the columns shall be set according to the requirements. When there is a crane of not less than 5t in the house, the section steel supports should be used for the support between the columns. When inter-column support is not allowed in the house, a longitudinal rigid frame should be set