久久天天躁狠狠躁夜夜20,欧美三级日韩精选,亚洲成A×人片在线观看,免费视频爰爱太爽了,亚洲av无码乱码国产麻豆穿越

How to design and type selection depends on the specific process, according to the cable type and quantity of the weak current system, as well as the reasonable selection of the appropriate bridge.

1, in determining the bridge width: according to a number of wiring, and between the diameter of the cable and cable tray cable distance to determine the grid models, specifications are managed and bridge length, spacing and width and layer.

2, installation: fixed mode can be more places to set the conditions to determine the bridge, suspensory or vertical, or supporting the supply of hybrid and firmware, they also have a corresponding cover selection structure of grid tray.

3. Draw the plane design drawings and sectional drawings of the cable grid tray, and in some places there will be a drawing space map for the material list.

4, determine the direction: according to the building plan, combined with air-conditioning pipe and the specific design of the electrical pipeline, convenient, simple, fast maintenance, as well as cable lines to determine the density of the grid bridge the best road strength. The edge, as far as possible in the interior of the building along the wall, pillar, beam or slab bridge design set, so comprehensive pipe gallery, should be on one side of the pipeline or parallel to the bridge design, the need to take into account the deflectors and the trunk as much as possible to prevent the interludes, if there is no other borrowing management need to set up their own pillar.

5. Load calculation: calculate the weight of the cable length on the longitudinal section of the backbone cable of the cable tray