4) Connection support accessories: the connector is used for direct connection; Round pipe joint is used for round pipe connection in junction box; Reducing joint is used for the connection between bridge and round pipe; The terminal is used for bridge terminal head; The support and adjusting bolt are used for bridge support and height adjustment.
6) The trough plates shall be close to the building wall and arranged neatly.
It is strictly prohibited to open holes in iron boxes and boxes by electric gas welding; 12) Before pipeline laying, check whether the pipeline is unblocked and whether there are burrs on the inner side; 13) The pipeline connection shall adopt screw thread connection or buckle type pipe connection; The pipeline shall be laid firmly and unobstructed without waist blocking pipe or foot mixing pipe; 14) The pipe entering the box shall be straight, and the exposed length in the box shall be less than 5mm; 15) The pipeline shall be integrally grounded and connected by jumper method.
3) The stress of the supporting point must be accurately calculated according to the size of the bridge.
If it is a double bridge, the center distance between the two bridges adjacent to the outlet is 1400mm.
2) The bridge must be installed horizontally and vertically.
Grounding copper wires or pieces are installed at all interface jumpers, and reliable repeated grounding is guaranteed for each layer.
The welding surface at both ends of the ground wire shall not be less than 6 times of the cross section of the jumper, and the weld shall be uniform and firm..
8) The insulation voltage of the insulated conductor passing through the pipe, slot and frame shall not be lower than 500V.
If there is no clear grounding point on the drawing, it is recommended to add a bv16mm2 two-color ground wire in the bridge.
2、 Key points of bridge installation I.
1、 The trunking laid vertically must be installed according to the underframe, and the horizontal part shall be fixed with supports.
At both ends of entry junction box, cabinet, turning and deformation joint and T-joint shall not be greater than 0.5m.
7) The conductor shall not be jointed in the trunking, and the wiring shall be carried out in the junction box.
7) Cable tray laying: place junction boxes and supports according to the standard position, and then place cable trays and outlets.
Achieve correct position, firm fixation and reasonable direction.
The inside and outside of the bridge shall be smooth and flat without edges and thorns, and there shall be no deformation such as distortion and edge warping.
2) Junction box and socket box: used as the turning and connection of conductors in the wiring plane.
At the same time, add various accessories as required.
2) When the trunking is connected with various module bases, the base shall press the slot plate head.
of the bridge must be designed according to the drawing trend and on-site building characteristics.
The bottom plate shall be fixed 50mm from the end point.
3) Special outlet: it is used to lead out wires and can be used as power supply, telephone, video socket or computer terminal outlet as required.
Special personnel shall be assigned to take care of concrete pouring, and problems found shall be handled in time.
5) Requirements for trunking crossing, turning and T-connection: flat without distortion, tight and straight joints, no thorns and gaps, accurate interface position and appropriate angle.
It is required to be uniform, neat, beautiful, firm and reliable.
5) Grounding protection must be added at least at both ends of the bridge.
The length of the adjusting bolt depends on the construction conditions, and the height adjustment is generally 30 ~ 50mm; S-type deepening special joint is used for vertical and horizontal crossing or crossing beam; The flat elbow is used at the corner of the bridge; Vertical elbow is used for the upper and lower connection ports of the bridge; Other special glue for bridge is used at the connection between bridge and bridge, bridge and junction box to prevent mortar from entering.
4) The corner bend must have sufficient radian to prevent the cable from being disassembled.
Before the wiring construction, the ponding and sundries in the trough should be removed.
9) The threading in the pipeline trough frame should be carried out after the plastering of the building and the ground works.
It is required to be grounded every 20m.
It is required that one pipe and one hole shall not be opened with long holes.
1) Strong wires with different voltages, different circuits and different frequencies shall be laid in different slots or placed in the same slot with isolation plates.
Crossing is the cross circuit of laying line, which can be used for the transformation of different pipe shapes and the height adjustment in a certain range.
The allowable deviation of straightness and verticality of the horizontal or vertical laying part of the bridge shall not exceed 5mm.
6) Snap line positioning: determine the bridge direction according to the design drawings, find the horizontal line or vertical line from the beginning to the end, snap the line outside the center of the line with a powder bag, find out the specific positions of junction box, junction opening and support respectively according to the requirements of the design drawings and the provisions of the construction acceptance specifications, and mark them with pencils.
The first outlet is set 230mm away from the junction box, and the standard spacing between outlets is 600mm.
The upward cable tray does not have to stand too long, otherwise it is easy to be broken.
2、 Actual laying process and technical requirements 1) the elbow, saddle, length, etc.
4) Only one interface is allowed between two fixed points of the trunking.
3) The length of the trunking screw above the nut shall be less than 5mm.
material selection 1) firstly, the bridge adopts fully enclosed high-strength rectangular steel pipe processed and formed by high-quality steel plate, and the surface is galvanized, which greatly improves the corrosion resistance.
Generally, the spacing between supports is 1.0-1.5m.
Isolation plate is set inside the junction box of double bridge line to ensure isolation and shielding between strong and weak current.
8) Jumper wire welding: determine the jumper wire specification according to the construction specification.
The distance between fixed fulcrums shall be between 1.5 and 2 meters according to the specific load of trunking.
10) Cold and hot simmering methods can be used for pipe simmering, hand wrench simmer can be used for pipe diameter of 20mm and below, and hydraulic simmer can be used for pipe diameter of 25mm and above; 11) The installation of crossing boxes shall be firm and flat, and the holes shall be neat and consistent with the pipe diameter.
The distance deviation between fixed fulcrum of trunking shall be less than 50mm.
After the connection is finished, adjust the bracket and the plastic cover to make the outlet to the right height.
When the connection of strong and weak current is very complex in the laying plane, the deepening junction box is adopted at the horizontal position of the bridge to cross the bridge in the horizontal direction, which greatly facilitates the direction of various lines.
In order to prevent mortar from entering, apply special glue around each connection, tighten the cover of each junction box and outlet box, bind with iron wire, and block the end with plastic.
