Construction Technology of Cable Bridge Frame in Clean Room
Release time:2019-10-04 source:
(1) Construction sequence
Measuring and Positioning Manufacturing and Installation of Supporting and Suspension Frame Installation of Bridge Frame Grounding Treatment
(2) Main construction methods and technical measures
1) Measurement and positioning
The installation position of the bridge frame is marked by the elastic line method, the fixed position of the support is determined, and the marking is done well. The erection datum line of the bridge in the shaft should be determined by the suspension steel wire method. If the reserved hole is not suitable, it should be adjusted in time and repaired well.
2) bracket fabrication and installation
According to the construction drawing design elevation and bridge specifications, positioning is carried out, and then according to the measurement size, the bracket is manufactured, and the bracket is manufactured in factory. Lifting along the bottom of beam or mounting by wall bracket without ceiling, lifting in ceiling or mounting by wall bracket with ceiling. In public places without suspended roofs, structural components are combined and installed on wall, column bracket or lower chord members of roof truss, taking into account the beauty of the building and the convenience of maintenance. Installation bracket by wall is fixed by expansion bolt, and the spacing of bracket is not more than 2 meters. Supporting suspension should be added at the joints of straight and non-straight sections, the deformed joints of buildings and the middle of non-linear sections with bending radius greater than 300 mm. The installation of supporting suspension should ensure that the horizontal or vertical degree of the bridge frame meets the requirements.
3) Bridge erection
A. For special shape bridge, the dimension measured on site is handed over to the material supplier, which makes the bridge according to the dimension and reduces the on-site processing. The material, model, thickness and accessories of the bridge frame meet the design requirements.
B. Before erecting the bridge, it must coordinate with other professions to avoid contradictions with large caliber fire hoses, sprinkler pipes, hot and cold water pipes, drainage pipes, air conditioning and exhaust equipment.
C. Lift the bridge to a predetermined position and fix it with the support bolt. The size of the bridge should be carefully checked at the turning point. The bridge should be in accordance with the slope of the building. The arc of the bridge on the wall of the circular building should be in accordance with the building. The bridge frame and the bridge frame are connected by connecting plates, and the connecting bolts are made of semi-circular head bolts, and the semi-circular head is on the inside of the bridge frame. The gap between the bridges must meet the design requirements to ensure that the bridge of a system is connected into one.
D. Bridges spanning the deformed joints of buildings should be treated with expansion joints according to the enterprise standard "Installation Technology of Steel Cable Bridge Frame". When the straight section of steel bridge exceeds 30 m, compensation devices for thermal expansion and cold contraction should be installed.
E. Bridge erection is horizontal and vertical, neat and beautiful, the distance is consistent, the connection is firm, the horizontal deviation in the same horizontal plane does not exceed 5 m m/m, and the straightness deviation does not exceed 5 mm/m.
4) Grounding Treatment
The galvanized connecting plate can be used as a cross-connection between galvanized bridge frames to connect the bridge frames into a whole. Galvanized spring gaskets are added to the two connecting bolts at both ends of the connecting plate. The bridge frame is spanned with no less than 4 mm2 soft copper wire, and then the bridge frame is connected with the grounding wire to form an electrical path. There should be no less than two connections between the whole bridge frame and the earthing trunk line.
5) Installation of Multilayer Bridge Frame
Layered bridge erection, first install the upper layer, then install the lower layer, the distance between the upper and lower layers to leave a margin, conducive to later cable laying and maintenance. The net distance between adjacent horizontal bridges should not be less than 50 mm, and the spacing between layers should be no less than 150 mm according to the width of the bridge and no less than 0.5 m from the weak current cable bridge.
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