Hello everyone, I'm Brother Xue. How to calculate the weak current integrated wiring list, each weak current system has cables, cables need to be calculated, there are methods to follow, let's take a look today.
First, the list of quotations: pay attention to the profit ratio
1. The quotation list is mainly disassembled by the construction unit price and the unit price of the material, if you are not the general contractor, it is easy to be the general contractor or Party A's routine, the reason is that everyone in the early stage of the material labor together, Party A will take out the materials, only subcontract the construction, maybe your profit is high is the material part, the profit ratio is also the focus of the quotation, which (materials, labor) will increase in the future and increase more in the later part is the list of the highest profits.
2. The list subsystem is classified, and there are many material classifications when quoting to avoid omissions. After all, if you don't count the cost, what you subtract is the profit.
3. Comprehensive wiring takeoff list
The table is designed to allow 8 weak current rooms to be added or deleted, and to be filled in according to the points of the drawing system diagram, including the floor height, the incoming line margin of the weak current room, and the reserved cables from the weak current room to the switchboard.
4. Calculation results
1. Automatically calculate the length of the cable draw, the length of the draw has a formula that has been made of margin, and it can be changed according to actual needs
2. Automatically calculate the total amount of horizontal cables and the length of cables from the weak current room to the switchboard
3. Automatically calculate the number of floor switches, modify the 16 ports, 24 ports, and 48 ports by yourself, as well as the number of distribution frames and jumpers in the weak current room. I think this formula is only suitable for beginners, and old drivers may have already come out with mental arithmetic in terms of cable calculation.
3. 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 over-long, if it is over-long, where should the sub-wiring room be set up, and how many sub-wiring rooms should be set up? If there are sub-wiring rooms, then the number of switches will also change 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
Fourth, the calculation of equipment materials
1. Calculation of cable:
L = 1.1 × (LMAX (maximum) + LMIN (minimum)) / 2 + 6
H = C × (1+2+3+N-1) + (N-1) × (12+12)
Number of cable boxes used in this project:
The number of information points that can be arranged in a box of network cables n=305 / L ( n is rounded to the whole number, the number after the decimal point is omitted)
Number of cable boxes required for all information points = Total number of data points / n
Among them, 1, L is the average amount of wire used at each information point, LMAX is the distance between the farthest information socket and the floor management room, LMIN is the distance between the nearest information socket and the floor management room, and 6 is the end-to-end tolerance (mainly considering the loss of the cable during construction, the cable layout length error and other factors), of which 10% is the spare margin. 2. H is the total optical fiber length, C is the floor height, N is the floor, and 12 is the end-to-end tolerance (mainly considering the length of the construction optical fiber splicing and wiring, because both ends need to be spliced, that is, 12+12). 3. n is the number of information points that can be arranged in a box of network cables, and 305m is the average length of each box of cables.
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. Cabinet (42U, 24U). Calculate the height of 48-port patch panels, line managers, RJ11 patch panels, switches, servers, etc. (U);
5. Configuration of optical fiber
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.
6. How to calculate the number of cables more accurately
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.
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