Who has a calculation book for civil construction of cable trays?

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Hello dear! Does anyone know the weight calculation formula of the cable tray: 600 (width) * 150 (height) - trough kg m (supporting blind jujube plate type) = cascade kg m = trough tray:

Trough = shield = cable tray weight calculation method: conductor weight = conductor specific gravity * cross-sectional area of which the specific gravity of the copper conductor is, aluminum is, the cross-sectional area is generally taken from the nominal cross-section, such as 10, grinding and dismantling, etc. Extruded insulation layer weight = extruded outer diameter before extrusion + absolute loss of simple edge thickness) * insulation thickness * insulating material specific gravity of PVC insulating material The specific gravity of PE insulating material is The weight unit calculated by the above formula is: kilogram kilometers, I hope to help you!

1 Selection of cable tray 1 1 In engineering design, the layout of cable tray should be comprehensively compared according to economic rationality, technical feasibility, operation safety and other factors to determine the best scheme, but also to fully meet the requirements of construction and installation, maintenance and cable laying. 1 2 The height of the cable tray from the ground when laid horizontally is generally not less than that, and the part below the ground from the ground when laid vertically should be protected by a metal cover, except when laid in a special electrical room. The cable tray is laid horizontally on the equipment mezzanine or on the sidewalk and is lower than 2 5m, and protective grounding measures should be taken.

1 3 cable tray, trunking and its support and hanger used in a corrosive environment, should be made of corrosion-resistant rigid materials or take anti-corrosion treatment, anti-corrosion treatment should meet the requirements of the engineering environment and durability. For places with high requirements for corrosion resistance or clean requirements, aluminum alloy cable tray should be selected. 1 4 cable tray in the section with fire protection requirements, can be added to the cable ladder frame, tray with fire-resistant or flame-retardant performance of plates, nets and other materials to form a closed or semi-closed structure, and take measures such as brushing fireproof coating on the surface of the bridge and its support and hanger.

Its overall fire resistance should meet the requirements of relevant national norms or standards. In places with high engineering fire protection requirements, aluminum alloy cable tray should not be used. 1 5 need to shield electromagnetic interference cable lines or have protection from external influences such as outdoor sunlight, oil, corrosive liquids, flammable dust and other environmental requirements, should choose non-porous tray cable tray.

1 6 In places where dust is easy to accumulate, the cable tray should be covered plate; In the public passage or outdoor crossing road section The bottom bridge should be covered with a backing plate or a non-perforated pallet. 1 7 Cables with different voltages and different purposes should not be laid in the same layer of cable tray: (1) Cables above 1kV and below 1kv:

2) Dual-circuit cable that supplies power to a primary load in the same path; (3) Cables for emergency lighting and other lighting: (4) Power, control and telecommunications cables. If different grades of cables are laid in the same cable tray, a partition should be added to isolate the middle.

1 8 When the length of the straight section of the steel cable tray exceeds 30m, and the aluminum alloy cable tray exceeds 15m, or when the cable tray passes through the building expansion (settlement) joint, there should be an o-30mm compensation margin, and the connection should be made of telescopic connecting plate. 1 9 cable ladder frame, tray width and height selection should meet the requirements of the filling rate, the cable in the ladder frame, tray in the filling rate in general, power cable can take 40 -50, control cable can take 50. 70 and it is advisable to reserve l0-252 project development margin.

1 10 when selecting the load class of cable tray, the working uniform load of cable tray should not be greater than the rated uniform load of the selected cable tray load grade, if the actual span of the support and hanger of cable tray is not equal to 2m, then the working uniform load should meet: where qg--- working uniform load, kn m; QE--- Rated Uniform Load, kn m; lg--- actual span, m.

Usually the load-bearing capacity of the cable tray is expressed by the load characteristic curve of the cable tray.

Corresponds to the same support distance and the amount of flexural and convex deformation. The bearing capacity of the bridge with large side height is large, and the bearing capacity of the bridge with small height is small.

In addition, when the load capacity is the same, for the same specification of cable tray. The amount of bending deformation is smaller than that of those with a small support distance.

In general, the cable tray is installed with a set of support frames at regular intervals. In the design calculation, if the actual load of the cable tray is expressed by the total g:

Then: g total = n1g1 n2g2 n3g3 ......

First of all, Xiangtai Electric reminds that the size of the bridge is changed according to the different ways and use environments, such as the cable is laid without spacing (the cable can only be tiled in the bridge), calculate the total cross-sectional area of the cable, and then according to the content of "04DX101-1 Common Data for Building Electrical", the cross-sectional area of the power cable shall not be greater than 40% of the cross-sectional area of the bridge. Therefore, divide the total cross-sectional area of the cable by the required cross-sectional area of the tray. Other specific comparisons are as follows:

See how many threads you put in! Then estimate!

1. The bridge installation includes the straight-through bridge and elbow, etc., and the engineering quantity is calculated according to the extension meter, and the length of the elbow, tee, and tee is not deducted. In the main material cost of the bridge, "straight through bridge, elbow, tee, and cross" are calculated according to the actual amount (including the specified loss).

2. The combined bridge takes the length of each piece m as a base piece, and has integrated the width of mm, mm, mm three specifications, and the engineering quantity calculation is based on "piece" as the unit of measurement. The degree is generally calculated by one meter of support.

Vertical press. m a support. The large span is calculated according to the length of your tray.

300*100 trough steel cable tray, how to calculate the tray bracket? How many kg per meter of cable tray is included in the bridge support to set the protection requirements of the cable tray and trunking:

1) The bottom of the cable tray should be higher than the ground.

and above, the top should not be less than 300mm from the floor of the building, and the intersection of beams and other obstacles.

The distance between them should not be less than 50

When the cable tray is laid horizontally, the support spacing should be. The spacing fixed on the building structure should be less than 2m when laying vertically.

The underground part should be protected by a metal cover plate, or encapsulated by a metal wiring cabinet, and the door should be openable.

3) Straight section cable tray every 15 30m

or across the deformation joint of the building, a telescopic compensation device should be arranged.

4) When the metal trunking is laid, a bracket or hanger should be set under the following circumstances: at the junction of the trunking; 3m per spacing

Place; Exit both ends of the trunking.

Place; At the turn.

5) The spacing between the fixing points at the bottom of the plastic trunking should be lm.

6) The turning radius of the cable tray and cable trunking should not be less than the minimum allowable bending radius of the cable in the trough, and the minimum bending radius at the right-angle bend of the trunking should not be.

Less than 10 of the outer diameter of the thickest cable in the slot

Fold. 7) When the tray and trunking pass through the firewall body or floor, fireproof blocking measures should be taken after the cable is deployed.

Cable tray calculation. It's about how the quantity of cable tray engineering is calculated.

Cable tray calculation. It is about the calculation method of how to calculate the engineering quantity of the cable tray: When you get the electrical construction drawings of the project, there are often reducing, tee, tee and other parts, we do not need to calculate the engineering quantity of these traces of the Xun bridge accessories, because the bridge elbow, bridge tee, bridge tee and bridge tee will be higher than the cable tray of the straight part, we only need to focus on the calculation of the bridge, and the bridge engineering quantity is calculated according to the extension meter. Teasing and then comprehensively increasing the unit price of the straight section to make up for the part at the elbow.

Calculation method 2: Some friends calculate the engineering quantity of cable tray as follows: the horizontal installation size is calculated according to the corresponding data ratio of the plan, the vertical size is calculated according to the corresponding layer height size of the system diagram, and the number of bridge elbows and bridge tees is calculated.

The method and calculation formula of the bridge are as follows:

Degree elbow answer thick:

Beveled edge = high lift x bottom edge = height, up-and-down cut-out width = side plate height of the trunking x left-right flip cut-out width = bottom plate width of the trunking x .

For example, if a 200 (bottom) x 100 (side) trunking needs to be flipped up 20 cm (height) after meters, we can calculate it as follows: (hypotenuse 28 = 20 x bottom edge 20 = 20 upside and up and down cutout width = 200 x.)

Degree elbow: hypotenuse = height x 2 bottom edge = height x up-down cut-out width = side plate height of trunking x left-right turn-out cutout width = bottom plate width of trunking x.

For example, if a 200 (bottom) x 100 (side) trunking needs to be turned to the left 20 cm (height) after meters, we can calculate it as follows: hypotenuse 40 = 20 x 2 bottom edge 34 = 20 x left and right flip cut width = 100 x.

Calculation formula for cable trays.

1. The load g calculation formula of the cable tray: g-n1*g1+n2*g2+n3*g3+..where:

n1、n2、n3...is the number of corresponding cables; gl、g2、g3...It is the weight per unit length of each cable (kg m).

The calculated value of g should be less than the allowable uniform load of the tray (refer to the load curve diagram of each tray), and when the cable tray is installed outdoors, it should also be included in the wind and snow load.

2. Calculation formula for cable tray width b: for power cables: b = n * (d1 + k1) + n2 * (d2 + k2) + n3 * (d3 + k3) + where:

n、n2、n3..is the number of corresponding cables; d1、d2、d3。for the outer diameter of each cable; k、k2、k3...

is the corresponding cable net spacing (K U003E 4).