The integrated wiring system in the intelligent building often uses hidden pipelines or bridges and channels for cable layout, which play a very good role in supporting and protecting the cables of the integrated wiring system. The installation of pipelines and channels in the construction of integrated wiring projects is an important task.

1. Weak current channel

(1) Determine the trenching route based on the following principles:

①The shortest route principle;

②Do not destroy the original strong current principle;

③Do not destroy the waterproof principle.

(2) Determine the groove width, determine the number of PVC pipes according to the number of signal lines, and then determine the width of the groove.

(3) Determine the groove depth. If a 16mm PVC pipe is selected, the groove depth is 20mm; if a 20mm PVC pipe is selected, the groove depth is 25mm.

(4) The appearance of the weak current ditch is required to be horizontal and vertical, with uniform size.

(5) For the measurement of the weak current ditch, the cassette and the weak current ditch are calculated independently. All measurements are made from the start of the weak current ditch to the end of the weak current ditch. If more than two tubes are placed in the weak current ditch, the length should be calculated as more than twice.
Second, the wire slot

1. Commonly used trunking

Different types and specifications of wire ducts can be selected according to the construction of integrated wiring. The following briefly introduces the commonly used wire grooves in construction.

(1) Open the pipeline.

The wiring construction of old buildings often uses open-laid pipelines, and new buildings should use less or try not to use open-laid pipelines. Steel pipes, PVC trunkings, PVC pipes, etc. are common in the integrated wiring system. The steel pipe has the characteristics of high mechanical strength, good sealing performance, bending resistance, compression resistance and tensile strength, especially for shielding electromagnetic interference. The pipe can be cut and bent at will according to the needs of the site, and the construction and installation are convenient. However, it has disadvantages such as heavier material, high price and easy corrosion. PVC trunking and PVC pipe have the characteristics of lighter material, convenient installation, corrosion resistance, and low price. Therefore, PVC trunking and PVC pipe are needed in some integrated wiring occasions with low cost and low requirements.

The exposed steel pipes in wet locations should be thick-walled steel pipes with a wall thickness greater than 2.5nm, and the exposed steel pipes in dry locations can be thin-walled steel pipes with a wall thickness of 1.6~2.5mm. When using galvanized steel pipes, it is necessary to check whether the galvanized layer of the pipe body is intact. If the galvanized layer is peeled off or rusted, anti-rust paint should be painted or other anti-rust measures should be adopted.

There are many specifications for PVC trunking and PVC pipes, which should be selected according to the cable capacity to be laid. The common ones are 25mmx25mm, 25mmx50mm, 50mmx50mm, 100mmx100mm, etc. PVC trunking, 10mm, 15mm, 20mm, 100nm and other specifications PVC pipe. In addition to the straight-through trunking of PVC trunking, it is also necessary to consider the selection of a sufficient number of corners, tees and other auxiliary materials. For PVC pipes, sufficient pipe clamps should be considered to fix the PVO pipe.
(2) Conceal the pipeline.

In newly-built smart buildings, hidden pipelines are generally used to lay cables. In the civil construction of the building, the buried pipeline is generally embedded at the same time, so the design content of the buried pipeline should be considered at the same time when designing the building. Concealed pipeline is one of the support protection methods often used in horizontal subsystems.

The common concealed pipelines are steel pipes and hard PVC pipes. The inner diameters of common steel pipes are 15.8mm, 27mm, 41mm, 43mm, 68mm, etc.

(3) Bridge frame and channel.

There are many manufacturers of bridges and channels, and the specifications of bridges and channels have not yet been formulated. The length, width and height of the bridge and channel products are produced according to the standards set by the manufacturer. For example, the length of the straight line is 2m, 3m, 4m, 6m, and the turning angles are 300, 450, 600, 900.

When installing a channel in a newly-built smart building, it is necessary to perform cutting, sawing, processing and assembly according to the specific size of the construction site, and the high-definition video conference system plan and quotation for the meeting room. Therefore, the installation and construction are time-consuming and laborious, and it is not easy to meet the aesthetic requirements. Especially it is more difficult to construct in an already built building. For this reason, it is best to have the manufacturer do pre-sale services when ordering bridges and channels, and measure the dimensions and turning angles of each section of the bridges and channels on the spot, especially the protruding parts such as beams and columns. According to the actual installed channel size and appearance color, production (including channel, bridge and related accessories and connectors). When installing T., you only need to construct in the order of assembly drawings to achieve the right number of seats, which is convenient for construction, but also meets the aesthetic requirements, and saves materials and reduces project cost.
2. Installation requirements of pipelines and channels

(1) Installation requirements for pipelines.

①The pre-embedded concealed pipeline should use straight pipelines, and try not to use curved pipelines. When the straight pipeline exceeds 30m and the distance needs to be extended, devices such as hidden wire boxes should be installed to facilitate the use of traction cables. If it is necessary to use curved pipes, it is required to install hidden wire boxes and other devices every 15m.

② If the hidden pipeline must be turned, its turning angle should be greater than 90°. The radius of curvature of the buried pipeline should not be less than 6 times the outer diameter of the pipeline. It is required that each concealed pipeline needs no more than two turns on the entire route, and there should be no wrinkles, cavities and cracks in the bend of the concealed pipeline.

③Exposed pipelines should be arranged neatly, horizontally and vertically, and each fixed point (or support point) of the pipeline should be evenly spaced.

④ It is required to put a pulling wire or pulling rope in the pipeline to facilitate the pulling of the cable.

⑤ There should be signs at both ends of the pipeline, and its content includes serial number, length, etc., which should correspond to the cables to be laid, so that errors are not easy to occur during the wiring construction.

(2) The installation requirements of bridge and channel.

① The installation position of the bridge and the channel should conform to the requirements of the construction drawing, and the left-right deviation should not exceed 50mm.

②The deviation of the levelness of the bridge frame and channel should not exceed 2mm per square meter.

③The vertical bridge frame and channel should be vertical to the ground without tilting, and the vertical deviation should not exceed 3mm.

④The horizontal deviation of the splicing place of the two channels should not exceed 2mm.

⑤The turning radius of the wire groove should not be less than the maximum value of the minimum allowable bending radius of the cable in the groove.

⑥ The ceiling installation should be kept vertical, tidy and firm, without skew.

⑦Metal bridge frame and channel section should be in good contact with the section and installed firmly.

⑧ There should be no obstructions in the pipeline, no burrs at the crossing, and a pull wire or pull wire should be installed.

⑨In order to achieve a good shielding effect, the metal bridge and the channel grounding body should meet the design requirements and maintain good electrical connections. When the enlarged logarithmic cable is passed through the pipe, the diameter utilization rate of the straight pipeline is 50%~60%, and the diameter utilization rate of the curved pipeline should be 40%~50%. When 4 pairs of twisted-pair cables are put in the pipe, the cross-section utilization rate should be 25%~30%. The section utilization rate of the wire groove should not exceed 50%.