Discussion on the Construction Method of the cabling project and the style of the Distribution Frame (1)

Discussion on the Construction Method of the cabling project and the style of the Distribution Frame (1)

(1) pre-construction inspection

1. Before the installation of the project, the construction and environmental conditions of the equipment room must be checked, and the construction can start only when the following conditions are met:

(1) All civil works of the equipment room have been completed, and the indoor walls have been fully dried. The height and width of the door between devices shall not impede the handling of equipment, and the door locks and keys shall be complete;

(2) the ground of the equipment should be smooth and smooth, and the quantity, position, and size of reserved Hidden pipes, slots and holes should comply with the process design requirements;

(3) The power supply has been connected to the equipment room and should meet the construction needs;

(4) The ventilation pipes between the equipment rooms should be cleaned, the air conditioning equipment should be installed, and the performance should be good;

(5) In the equipment room where the movable floor is laid, special inspection should be carried out on the movable floor. The laying of the floor plate is tight and sturdy and meets the installation requirements. The horizontal error per square meter should not exceed 2mm, the floor shall be well grounded, and grounding resistance and anti-static measures shall comply with requirements.

2. Requirements of the inter-handover Environment

(1) In accordance with the design specifications and engineering requirements, arrangements should be made for the floors and interchange rooms of vertical passages of buildings, and check whether the construction and environmental conditions are met.

(2) cable holes in the vertical channel of the connecting room should be kept, and horizontal channel pipes, cable trays, and environmental conditions should be checked.

3. Equipment inspection requirements (omitted)

4. Security Requirements (omitted)

5. Technical preparation (omitted)

(2) Construction of twisted pair Transmission Channel

1. Laying metal tubes

(1) Requirements for metal pipes

The metal pipe shall comply with the provisions of the design documents. The surface shall not contain perforation, cracks and obvious unevenness, the inner wall shall be smooth, and rust shall not be allowed. Sufficient strength pipes should be used in places prone to mechanical damage and Directly Buried in places with high stress.

(2) Cutting sleeves of metal tubes

The pipe is cut according to the actual length. Pipe Cutting can use a saw, pipe cutting knife or electric pipe cutting machine, it is strictly prohibited to use gas cutting.

Pipe and pipe connection, pipe and junction box, distribution box connection, must be in the end of the pipe wire. When the wire is set, the pipe is fixed and pressed on the pipe clamp first, and then in the wire set, the tube should be cleaned immediately after the sleeve is set, the tube end face and the burr of the inner wall should be filed to keep the pipe mouth smooth.

(3) Bending of metal tubes

During laying, try to reduce the number of elbows. The number of elbows for each pipe should not exceed 3, the number of right-angle elbows should not exceed 2, and the number of bending S should not appear.

Bending a metal pipe is generally performed with a bend. First, place the front part of the pipe to be bent in the pipe bending tool, and place the weld on the back or side of the Bending Direction to prevent the pipe from being bent flat and then step on with your feet.

Pipe, hand-panel bending tool, you can get the required bending.

The hidden pipe mouth should be smooth, and an insulating casing should be added. The extension part of the pipe mouth should be 25-30mm.

(4) Connection of metal tubes

Metal pipe connection should be reliable, seal should be good, two pipe ports should be aligned. The length of the sleeve or Threaded Pipe Joint should not be less than 2.2 times the outer diameter of the metal pipe. When the metal pipe is connected with a short sleeve, the construction is simple and convenient. The threaded connection of the pipe joints is more beautiful, which can ensure the strength of the metal pipe after connection.

After the metal pipe enters the junction box of the information outlet, the hidden pipe can be fixed by welding. The exposed length of the pipe port into the box should be less than 5mm. Apply the lock nut or screw-lock pipe cap for fixing, and 2-4 buckles for the exposed lock nut.

(5) laying metal pipes

A. the concealed settings of metal tubes shall comply with the following requirements:

* The diameter of the metal pipe embedded in the middle of the Wall should not exceed 50mm, the diameter of the floor should be 15-25mm, and the hidden box should be set at 30mm of the linear layout tube.

* Metal pipes laid in concrete and cement shall be solid, flat, and shall not be sunk to ensure the safe operation of cables after laying.

* When the metal pipe is connected, the pipe hole should be aligned, the joints should be tight, and there should be no cement or mortar infiltration. The pipe hole is aligned with each other without dislocation, so as to avoid affecting the effective management of pipes, cables, and troughs and ensure smooth cabling During cable laying.

* The drainage slope of metal pipes should be no less than 0.1%.

* The burial depth of metal pipes between buildings should not be less than 0.7 m; when laying underneath the sidewalk, it should not be less than 0.5 m.

* Wires or cables should be placed in the metal tubes.

* The two ends of the metal pipe should be marked, indicating the building, floor, room, and length.

B. Plastic daughter tubes should be preset in metal tubes when cables and cables are laid in the same pipe. Lay the optical fiber cables in the Child tube so that the optical fiber cables and cables are arranged separately. The diameter of the Child tube should be 2.5 times of the outer diameter of the optical fiber.

2. Laying of metal cable Trough

(1) cable slot installation requirements

* The installation position of the cable trough shall comply with the construction drawing regulations. The deviation between the left and right depends on the environment, and the maximum length shall not exceed 50mm;

* The Horizontal Deviation of the cable trough per meter should not exceed 2mm;

* The vertical cable trough should be perpendicular to the ground without skews. The vertical deviation should not exceed 3mm;

* The cable trough section and the Section are spliced with a joint connecting plate, and the screws should be tightened. The horizontal deviation between the two slots must not exceed 2mm;

* When the Cable Section bridge exceeds 30 m or spans a building, there should be expansion joints. It should be connected with a scaling Connection Board;

* The turning radius of the cable trough should not be smaller than the minimum allowable bending radius of the cable in the trough.

* The covers should be fastened.

* The hanger should be vertical, neatly and reliably maintained, without any skew.

(2) horizontal subsystem Cable Laying support protection

Pre-buried metal cable trough support protection requirements:

A. The pre-Buried Cable trough in a building can be of different sizes. If it is set to one or two layers, at least two or more cables should be pre-buried, and the cross-section height of the cable trough should not exceed 25mm;

B. The direct buried length of the cable trough exceeds 15 MB, or the cable box is set at the intersection of the cable trough routing and turning to facilitate maintenance during cabling of the cable box.

C. The cable lid should be able to be opened and flat with the ground. The lid should be able to be opened and waterproof measures should be taken.

D. Wire trough should be introduced into the wire box with metal tubes.

Set Line Slot support protection:

A. During Horizontal laying, the distance between the support is generally 1.5-3 m, and the distance fixed on the building body during Vertical Laying should be less than 2 m;

B. When laying a metal wire slot, set a bracket or hanger in the following cases: cable connector, 3 m spacing, m off the two ports of the wire slot, Line slot to change or bend.

When cables are laid under the active floor, the clearance of the active floor should not be less than 150mm. If the floor is used as the air duct of the ventilation system, the clean height of the floor should not be less than 300mm.

When the information point position and cable laying method of the work area are not fixed, or cables are laid under the carpet in the work area, a junction box should be set up in the work area.

(3) trunk subsystem Cable Laying support protection

Cables cannot be placed in an elevator or pipe shaft.

Communication Between Trunk channels is required.

The cables in the weak current room should be square or circular through the holes in each floor.

The cable laying support and protection of the subsystem of the Building Group should comply with the design requirements.