How to better and faster install the bridge? Based on many years of project implementation experience, I will provide you with some optimization ideas and steps here.
According to the project plan, the optimal routing of cable tray shall be determined in combination with the setting, convenient maintenance and routing density of air conditioning pipes and electrical pipes. Indoor, it shall be erected along the wall, column, beam and floor of the building as far as possible. If the integrated pipe gallery is adopted, it shall be erected in parallel on one side or above the pipeline, and the down lead and branch line shall be considered to avoid crossing as far as possible. If there is no other pipe support to borrow, the column shall be erected (supported) by itself.
Calculate the cable weight per unit length on the main section of Jinan Bridge.
Determine the width of the bridge:
The type and specification of the cable tray, the length of the support arm, the length and spacing of the pillars, the width and layers of the cable tray determine the cable and cable spacing according to the number of cables to be laid and the cable diameter.
Determine the installation method:
The fixing mode of the bridge shall be determined according to the setting conditions of the site, and the suspension type, vertical type, side wall type or mixed type shall be selected. Connectors and fasteners are generally supplied in complete sets. In addition, the corresponding cover plate shall be selected according to the bridge structure.
Draw the plan and section of the cable tray, and also draw the space map of some parts, and list the material list. Draw the route of the bridge on the parallel diagram, and indicate the coordinates or positioning dimensions and elevations of the starting point, ending point, turning point, branch point and lifting point of the bridge. If the cable tray laying shaft side diagram can be drawn, the material statistics will be more accurate;
In addition, the bridge system shall have reliable electrical connection and grounding. The technical requirements for the continuity of the protection circuit are as follows: the connection resistance at the jumper point shall be less than or equal to 50m Ω; The connection resistance at the point without contact shall be less than or equal to 5M Ω /m. The special grounding wire can be laid along the whole length of the FRP Bridge as required. The small cross-sectional size can be in accordance with the provisions of 188.8.131.52.3 in gb7251.1-2013, or negotiated between the user and the manufacturer.
When the cables in Jinan Bridge are laid vertically, they shall be fixed on the support of the bridge at the upper end of the cable and at an interval of 1.5m. During horizontal laying, the cable shall be fixed at the head, tail, turn and every 3~5 meters;
When laying wires in horizontal and vertical cable trays and vertical trunking, cables shall be bound. 24 pairs of cables shall be used as bundles, and 25 or more pairs of trunk cables, optical cables and other signal cables shall be bound in bundles according to the type, diameter and number of cable cores. The binding spacing shall not be greater than 1.5m. The buckle spacing shall be uniform and the tightness shall be appropriate.
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