How to calculate the quantity of weak current engineering? You have to look at these methods!

Hello everyone, I'm Brother Xue. It is very important to do the bill of quantities and verify the quantity of the intelligent weak current industry, and the key method should be correct, summarize it today.

Calculation of weak current engineering quantity:

1. Calculation of auxiliary materials

1. The number of statistical information points, including each room and computer room, is filled in the point distribution table;

2. Determine whether it is super long? If it is too long, where should I set up the sub-wiring room, and how many? If there are sub-closets, the number of switches will vary accordingly.

3. Determine the direction of the route;

4. Determine the model and length of the bridge at each place.

Calculation method: (length×width) ×0.4/28, the result is the number of information points, the commonly used standard bridge is: 300×100, 200×100, 100×100, 100×50, 50×50, other bridges need to be customized.

1. The number of statistical information points, including each room and computer room, is filled in the point distribution table;

2. Determine whether it is super long? If it is too long, where should I set up the sub-wiring room, and how many? If there are sub-closets, the number of switches will vary accordingly.

3. Determine the direction of the route;

4. Determine the model and length of the bridge at each place. Calculation method: (length×width) ×0.4/28, the result is the number of information points, the commonly used standard bridge is: 300×100, 200×100, 100×100, 100×50, 50×50, other bridges need to be customized.

Note: If the branch route has the same bridge model, its length is calculated separately, and the total length of the bridge model is counted at the end.

5. Calculation of ø25 and ø20 pipes (usually ø25 can lay 6 wires, ø20 can lay 4 wires). When calculating, based on ø20, the average length of a certain information point from the bridge to the terminal needs ø20, if it is A, then it can be calculated that all information points need the length of ø20, that is, B=A×(total points/4), and in practice, ø20=2/3×B, ø25=1/3×B.

6. Calculation of angle steel (30×30). The length of the angle steel = 30cm× (the total length of the bridge m/1.5m), that is, the average length of each angle steel is 30cm, and an angle steel is needed every 1.5m distance.

7. Calculation of keel (75×45). The length of the keel = 70cm× (total points/2), that is, the length of each keel is 70cm, usually arranged as a double-mouth panel.

8. Calculation of keel clips, pipe joints, box joints, rivets, hacksaw blades and other auxiliary materials. = 10% of the total excipient price×

9. Calculation of the bottom box (86×86). Number of bottom boxes = Total number of points / 2

1. Calculation of cable: (farthest + closest)/2× points × 1.1/305

Illustrate:

The farthest point from the computer room to the information point; The nearest information point in the computer room is generally 20 meters;

If there is a sub-distribution room, then the number of points is the number of information points covered by the route from the sub-distribution room, and 0.1 in 1.1 is the amount of wealth, that is, 10%. 305 is the length of each box of wires is 305 meters.

If there are sub-wiring rooms, they should be calculated separately and the formula is the same. That is, the number of cables required for the central distribution room to cover the information points + the number of cables required for the sub-wiring room to cover the information points + the number of cables required for the cascading cable from the sub-distribution room to the central equipment room.

Another point to note is that the number of network cables is generally about 300 meters, less than 305 meters, if the number of cables in this project is relatively large, this is also considered. For example, the length of the cable reserved at the end of the threading equipment should also be considered comprehensively, which will also be judged according to the overall construction technology of your construction team.

2. Calculation of modules. is the number of information points;

3. The number of double-port panels: total points/2;

4. Calculation of 48-port patch panel. Total points/48, if there are sub-wiring rooms, they should be calculated separately, that is, the number of information points covered by each of them/48, and then add them together, 4U;

5. Calculation of the line manager. The 48-port patch panel does not need a line manager (built-in), mainly for the switch, if there is a sub-distribution room, it should be calculated separately. 1U；

6. Cabinet jumper (2m). Jumper from patch panel to switch + cascade line between switches.

7. Jumper of workstation. the number of total points;

8. RJ45 head. (Cabinet jumper + workstation jumper) ×2×1.1;

9. RJ45 head sheath. for the number of RJ45 heads;

10. The number of three types of large logarithms. The distance from the weak well to the machine room through the bridge + the amount of abundance (larger, because the large logarithm cannot be connected);

11. 110DW2-100FT patch panel (2U). One is 100 pairs;

12, 110 through the wire duct. Consistent with the number of 110 patch panels;

13. 110 backplane (4U). For: 110DW2-100FT number of patch panels/2;

14, 110C4 connecting block (10 per package).

The 110DW2-100FT patch panel is 100 pairs, that is, 100 telephones, it is composed of four parts, each part is 25 pairs, that is, it is composed of 5 C4 connection blocks and 1 C5 connection block (5×4+1×5=25), that is, 100 pairs of large pairs need 20 C4 connection blocks and 4 C5 connection blocks.

15, 110C5 connecting block (10 per package). Ibid;

16. Telephone jumper (plate/100 meters). Each telephone patch cord requires 1.5 meters.

17. RJ11 head. There is a decision on the number of telephones, for example, 200 telephones (200 pairs of large pairs) need 200 RJ11 heads (the other end is directly on the RJ11 patch panel);

18. Telephone cabinet (200 times). Decide on the basis of telephone points;

19、机柜(42U,24U)。 计算48口配线架、线管理器,RJ11配线架、交换机、服务器等的高度(U);

Description: There is a central computer room on the second floor, and a sub-wiring room, which is a sub-wiring room on the 4th and 7th floors, and 6 indoor multi-mode optical fibers are placed in each of the three sub-wiring rooms.

Modular connection mode: fiber optic consumables and ST multimode fiber connectors are required;

Splicing method: Single-chip multi-mode ST pigtail is required, and optical fiber filaments and ST multi-mode fiber connectors are not required.

First of all, the number of cables should be calculated according to the construction drawings, we do the construction according to the drawings, and the drawing accounting is the basis of the entire project budget. After getting the construction drawings, it is generally necessary to compare the direction of the bridge on the site according to the drawings, whether it is in line with the design of the drawings, determine the direction of the bridge, and basically determine the main line.

The second is to calculate the cable drawn from the tray, and the cable drawn out of the tray will generally be made into a tube, and there are generally two ways to make a pipe: one is hoisted by the line pipe, and the other is installed along the top plate.

The calculation of hoisting construction cables and pipes is relatively simple, that is, according to the calculation of the drawings, reserve 30cm-100cm at the end of the final equipment, depending on your final installation equipment and equipment location. Installing cables and pipes along the roof must be looked at, whether it is a lintel, this can not be calculated according to the drawings, and the number of cables and pipes should be calculated by comprehensively considering the conditions of on-site construction.

There is also the calculation of the vertical part and the horizontal part, especially in the calculation of the cable in the weak current well, the first thing to look at is the floor height, and then the distance between the installation position of the weak current well equipment and the bridge, comprehensive consideration, comprehensive calculation.

In short, Xue Ge believes that the calculation of the number of cables is partly based on drawings, partly based on the site, partly based on experience, and partly based on the construction team.

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