1、 Comprehensive layout of mechanical and electrical engineering pipelines
Focus on the layout and implementation of end pipelines in various mechanical and electrical units, such as the installation of wire boxes, various exposed pipes, ventilation and electrical hoses, small diameter water pipes and their supports and hangers. Key focus areas: equipment rooms, public walkways, elevator front rooms, etc. Boxes, boxes, switches, sockets, pipelines, etc. on the walls of the equipment room should be laid in conjunction with the completion surface of the sound insulation and noise reduction layer, and the insertion time period of each process should be controlled.
The pipeline layout is neat and orderly, and the spacing is maintained reasonably. The pipeline laying transitions smoothly with the structure. The pipeline paint is uniform and bright, with clear markings.
The comprehensive layout of pipelines in suspended ceilings and pipe galleries is a difficulty in mechanical and electrical installation. The elevation and space in these areas are limited, and the layout of pipelines is prone to conflicts. When laying out, it is necessary to simultaneously consider the construction space, equipment installation space, and future inspection and maintenance space (pay attention to the setting of maintenance doors and maintenance tracks).
2、 Construction process of supports and hangers
Key points of the process:
① It should be ensured that the installation of supports, hangers, and pipelines is firm and reliable. Rows of pipelines should be installed on the same bracket, and the supports and hangers should be arranged neatly and aesthetically, with bright paint.
② The bracket is chamfered and polished to ensure smooth chamfering.
③ The distance between pipelines should be reasonable and insulation distance should be reserved.
④ The insulation pipeline supports and hangers should be made of flat steel using wooden brackets as the U-shaped clamps for the cooling and insulation system. The width of the flat steel should be consistent with the wooden support, and the U-shaped clip should tightly fit the wooden support.
⑤ The size of the section steel should be selected reasonably, and a hole opener should be used for opening. Gas welding is strictly prohibited for opening. The lower end of the bolt is uniformly exposed for 2-3 threads, not exceeding 1/2 of the diameter of the screw rod.
⑥ Supports and hangers should be added at the concentration, turns, branches, and both ends of large-diameter valves and accessories of pipelines for support, and the spacing between supports and hangers should meet the specification requirements.
3、 Construction process of cable tray
Key points of the process:
① Finished accessories should be used. The supplier does not specify the size of the accessories or the size data is insufficient. Please follow this standard specification.
② When the bridge is bent, if the diameter of the large cable is less than 70mm, the bending angle of the bridge should not exceed 30 degrees. When the diameter of the large cable is less than or equal to 50, the bending angle should not exceed 45 degrees.
③ To ensure that the cable bending radius requirement is met when laying large cross-section cables in small bridges, L should meet L ≥ 10D-W/2.
④ When laying metal cable trays horizontally, the height from the ground should generally not be less than 2.5M. When laying vertically, a metal cover plate should be added to protect them when they are 1.8m above the ground (except for distribution rooms, electrical wells, and technical floor dedicated areas).
⑤ A straight section steel cable rack with a length exceeding 30m, and an aluminum alloy or fiberglass cable tray with a length exceeding 15m are equipped with expansion joints; Install compensation devices at the deformation joints where the cable tray crosses the building.
⑥ When there are no design requirements, the installation spacing of horizontal brackets is 1.5-3m, and the spacing of vertically installed brackets is not more than 2m. Maintain a uniform spacing, and set a bracket at 0.5m between the inlet and outlet of the junction box, box, cabinet, corner, turning, deformation joint ends, and the three ends of the T-joint.
⑦ The bolts between the bridge and the bracket, as well as the bolts on the bridge connecting plate, are fixed firmly without any omissions, and the nuts are located on the outer side of the bridge; When the aluminum alloy bridge is fixed to the steel bracket, there are insulation measures to prevent electrochemical corrosion between them.
⑧ The cable tray is laid below flammable and explosive gas pipelines and thermal pipelines. When there are no design requirements, the clear distance from the pipeline should be very small and comply with regulations.
⑨ When wiring cables, the bending radius of cable trays, trunking, and pipes should not be less than the very small bending radius of the cable.
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