NB/T 10292-2019Aluminium alloy cable tray system (English PDF)

3.1 Cable tray system

The straight sections, bends, accessories, brackets and other components of the pallet or ladder frame constitute a continuous rigid structural system supporting the cable line.

3.2 Aluminium alloy cable tray system

The straight-through, bend-through, accessories and brackets of the pallet or ladder frame made of aluminum alloy material are used to support the cable with continuous rigidity Structure of the overall device.

3.3 Hole cable tray

A trough-shaped component formed by a bottom plate with perforations and side edges or a whole aluminum plate punched out.

3.4 Cable tray without hole

A trough-shaped part formed by a bottom plate and a side edge or bent from a whole aluminum plate can also be a trough-shaped part formed by hot extrusion.

3.5 Compounding cable tray

Any combination of bolts or plug-in connection into groove-shaped components.

3.6 Stair-type cable tray

A rigid trapezoidal component composed of sides and several crosspieces.

3.7 Straight-way

A section of pallets and ladder frames that cannot be changed in direction.

3.8 Equal radius straight-way

A straight-through section of constant size.

3.9 Different radius straight-way

A straight pass that changes size.

3.10 Bend-way cable tray

A section of pallets and ladders that change direction.

3.11 Horizontal bend-way cable tray

Parts that change the direction of pallets and ladder frames on the same horizontal plane.

3.12 Horizontal 3-way cable tray

The components of the tray and the ladder frame are connected in three directions at 90° on the same horizontal plane.

3.13 Horizontal 4-way cable tray

The components of the tray and the ladder frame are connected in four directions at 90° on the same horizontal plane.

3.14 Upper bend-way cable tray

The parts that make the pallet and ladder frame change direction upward from the horizontal plane.

3.15 Down bend-way cable tray

The parts that make the pallet and ladder frame change direction downward from the horizontal plane.

3.16 Vertical 3-way cable tray

The components of the pallet and ladder frame are connected in three directions separated by 90° on the same vertical plane.

3.17 Vertical 4-way cable tray

The components of the pallet and ladder frame are connected in four directions separated by 90° on the same vertical plane.

3.18 Bend-way radius

The radius of the inscribed circle of the two inner right-angle sides of the bend (referred to as the bending radius).

3.19 Accessories

Used for the connection between pallets or ladder frames, between straight and curved, to form the necessary connection and fixation for connecting rigid structural systems Or components that supplement straight-through and curved-through functions.

3.20 Support post

Components that directly support pallets or ladder frames.

3.21 Support arm

Rigid parts that directly support pallets and ladder frames and are fixed at one end.

3.22 Upright post

The component that directly supports the arm.

3.23 Suspender

Rigid parts for suspension pallets and ladder frames.

3.24 Rated uniformly distributed load

Within a certain span, the maximum safe uniformly distributed load per meter of the bridge.

3.25 Span

The distance between the midpoints of two adjacent brackets and hangers (3 m or more is a large span).

4.1 Classification

4.1.1 See Table 1 for the structure type and code of the bridge.

4.1.2 See Table 2 for the component types and codes of the bridge.

4.1.3 See Table 3 for the classification and code of the protective layer of the bridge.

4.2 Logo

4.3 Dimensions

The common specifications and dimensions of the bridge are shown in Table 4.

Note: The symbol "*" indicates common specifications, and other specifications can also be made through negotiation between the supplier and the buyer.

5.1 Mechanical properties of materials

5.1.1 The aluminum alloy plate for the bridge frame can be selected from the 5052 grade in Table 1 in GB/T 3880.2-2012, and the supply status is H12 or H24 aluminum For alloy materials, other aluminum alloy materials with mechanical properties no less than 5052-H12 or H24 can also be used.

5.1.2 Aluminum alloy extruded profiles for ladder frames can be selected from the 6063 grades in Table 12 of GB/T 5237.1-2017, and the supply status is T5 aluminum alloy For gold materials, other aluminum alloy materials with mechanical properties no less than 6063-T5 can also be used.

5.1.3 The aluminum alloy extruded profile of the support and hanger for the bridge can be selected as 5052 in Table 4 of GB/T 6892-2015, and the supply status is H12 Or H24 aluminum alloy materials, other aluminum alloy materials with mechanical properties no less than 5052-H12 or H24 can also be used.

5.1.4 The aluminum cover plate for the bridge frame and the bottom plate of the assembled pallet can be selected as 1060 in Table 1 of GB/T 3880.2-2012.

For aluminum materials with H14 or H24 application status, other aluminum materials with mechanical properties no less than 1060H14 or H24 can also be used.

5.2 Appearance quality

5.2.1 The surface of the bridge frame should be clean and smooth, with uniform color, and no defects such as cracks, burrs, sharp edges, peeling, corrosion and bubbles are allowed.

5.2.2 The surface of the bridge with anodized surface treatment is not allowed to have defects such as electric burns, peeling off of the oxide film or exposure of the bottom.

5.2.3 The surface of the bridge frame with electrophoretic painting, powder spraying or fluorocarbon paint spraying treatment shall not be allowed to have wrinkles, cracks, Bubbles, flow marks, inclusions, stickiness, shedding, exposed bottom and other defects that affect use.

5.3 Manufacturing accuracy

5.3.1 The allowable deviation of the length of the straight section of the bridge tray and ladder frame shall meet the following requirements.

a) When the length is <=2 000 mm, the allowable deviation is ±2.0 mm;

b) When the length is more than 2 000 mm, the allowable deviation is ±4.0 mm.

c) The distance between the centers of the bridge crosspieces should not be greater than 350 mm, the width of the crosspieces should not be less than 40 mm, the crosspieces and the cable contact plane (Along the long axis direction of the bridge through the body) the width is not less than 12 mm.

d) The height and width of the bridge frame should meet the requirements of Table 4, the size deviation and other unrequired limit deviations It shall meet the requirements of Grade V in GB/T 1804-2000.

5.3.2 The thickness of the bottom plate, side plate and cover plate of the bridge should meet the requirements of Table 5.

5.3.3 The straightness of the bridge tray and ladder frame shall not exceed 3 mm in length measured per 1,000 mm.

Note: When the measured length is less than 1 000 mm, the straightness error is converted according to the interpolation method.

5.3.4 For the flatness of the bridge, the measured length of every 1,000 mm shall not be greater than 4 mm.

Note: When the measured length is less than 1 000 mm, the flatness error is converted according to the interpolation method.

5.3.5 For bridge trays and ladders with arc-shaped or bent-shaped bends, the inner bending radius of the bends should meet the requirements of 200 mm, 300 mm, 600 mm, 900 mm; its size deviation should not be greater than 5.0%.

5.4 Structural requirements

5.4.1 The area of the ventilation holes at the bottom of the tray with holes on the bridge should not be greater than 40% of the bottom area.

5.4.2 For multi-layer bridges with pallets and ladders, the net distance between the layers of the supporting arms shall not be less than 150 mm.

5.4.3 Gas-shielded arc welding should be used for the welding of the bridge, and the surface of the weld should be smooth and uniform, and there should be no missing welding, false welding, cracks, burn-through, For defects such as pores and weld bead, the undercut depth of the weld shall not be greater than 0.5 mm, and the surface of the weld shall be repaired with a protective layer.

5.4.4 The riveting of the bridge should be tight and firm, and there should be no defects such as misalignment, deflection, cracks, etc., and the rivet head should not have protruding burrs that damage the cable.

5.4.5 The cross-sectional shape of the bridge frame after processing and forming should be regular, without defects such as bending, twisting, edge burr, etc., and the inner surface should be smooth, flat and free Bumps and sharp corners that damage the cable insulation.

5.5 Carrying capacity

5.5.1 Under the condition that the supporting span of the bridge is a simply supported beam of 2 000 mm, the rated uniform load rating of the pallet and the ladder frame is divided into five levels, each level The level should meet the requirements of Table 6. The safe working load of typical aluminum alloy cable tray is shown in Table 11 in JB/T 10216-2013.

Note: The load level is negotiated and determined by the manufacturer and the user.

5.5.2 The load-bearing capacity of the bridge should be verified by a load test in accordance with the provisions of Appendix A in GB/T 23639-2017.

The ratio of the maximum deflection value to the span of the ladder frame under the rated uniform load shall not be greater than 1/150, and there shall be no permanent deformation or instability Elephant.

Note: For bridges whose dimensions satisfy both height less than 80 mm and width less than 200 mm, no load capacity verification is required.

5.5.3 The bridge manufacturer shall provide various types of pallets and ladders with different spans and allowable uniform load and the ratio of deflection values to their span Value relationship curve or data table.

5.5.4 The ratio of the maximum deflection value of the hanger of the bridge or the support arm fixed on the side wall to the span when bearing the rated uniform load of the pallet and ladder frame is not Should be greater than 1/100.

5.5.5 The various types of supports and hangers of the bridge should be able to bear the rated uniform load and its own weight of the corresponding specifications and number of layers of the pallets and ladders. Produce permanent deformation and cracks.

5.5.6 The force-bearing accessories such as the connecting plates and connecting bolts of the bridge should be compatible with the structural strength of the pallet, ladder frame, support arm and other bodies.

5.6 Impact resistance

The tray and the ladder frame of the bridge frame should be able to withstand the impact test of 5 J, and the impact specified by the Eha pendulum method in Chapter 4 of GB/T 2423.55-2006 After the test, the pallet or ladder frame shall not show any cracks and deformation that affect safety.

5.7 Electrical performance

The bridge should have reliable electrical continuity. When the pallets or ladders are connected by connecting plates, the connection resistance between the two pallets or ladders It must not be greater than 33 mohm/m, and the resistance at the point without a jumper must not be greater than 3 mohm/m.

5.8 Surface protection layer

5.8.1 For the bridge frame with anodized surface, the thickness of the side plate or ladder transverse oxide film should meet the requirements of GB/T 5237.2-2017

5.8.2 For the bridge frame with electrophoretic paint treatment surface, the thickness of the paint layer shall meet the requirements specified in 4.1.3 of GB/T 5237.3-2017 Paint film level B level requirements.

5.8.3 For bridges with powder sprayed surfaces, the coating thickness should meet the requirements of 4.6.1 in GB/T 5237.4-2017.

5.8.4 For bridges with spray-painted surfaces, the thickness of the paint layer should not be less than the secondary coating quality specified in Table 2 of GB/T 5237.5-2017 Quantity requirements.

5.9 Requirements for anti-galvanic corrosion

5.9.1 The riveting and fastening of the bridge cover profile and the width adjustment plate and the side plate and the crosspiece shall be made of aluminum rivets or aluminum-zinc-coated steel screws. bolt. Avoid using fasteners (such as zinc-plated or chrome-plated bolts) with a large potential difference from aluminum to prevent galvanic corrosion.

5.9.2 When the cable tray is installed with a cable with a copper shell, there must be a copper-aluminum transition joint device between the cable tray and the cable to prevent or slow down galvanic corrosion.

Or there is an insulating device between the cable copper shell and the bridge support contact surface.

5.9.3 For other accessories and fasteners in contact with the aluminum body of the bridge, aluminum rivets or aluminum-zinc coated Steel bolts.

6.1 Mechanical properties of materials

6.1.1 The mechanical properties of the aluminum alloy plate for the bridge frame shall be carried out in accordance with the provisions of 4.5 of GB/T 3880.1-2012.

6.1.2 The material and mechanical properties of aluminum alloy extruded profiles for ladder frames shall be carried out in accordance with the provisions of 5.3 of GB/T 5237.1-2017.

6.1.3 The mechanical properties of the aluminum alloy extruded profiles for the support and hanger of the bridge shall be carried out in accordance with the provisions of 4.3 in GB/T 6892-2015.

6.1.4 The material and mechanical properties of the aluminum cover plate for the bridge frame and the bottom plate of the assembled pallet shall be in accordance with the provisions of 4.5 in GB/T 3880.1-2012. Row.

6.2 Appearance quality

The appearance quality of the bridge frame is measured by hand touch and visual inspection.

6.3 Manufacturing accuracy

6.3.1 The length of the bridge tray and the ladder frame and the horizontal center distance of the ladder frame shall be measured with a steel tape or steel ruler with a reading accuracy of not less than 1 mm.

6.3.2 The height and width of the bridge frame shall be measured with a caliper with an accuracy of not less than 0.02 mm or other measuring tools with the same accuracy.

6.3.3 The thickness of the tray tray, the bottom plate and the side plate of the ladder frame, and the thickness of the tray and the ladder frame cover shall use a wall thickness with an accuracy of not less than 0.01 mm. Ruler or other measuring tools with the same accuracy.

6.3.4 The straightness of the bridge tray and ladder frame shall be carried out with a knife-edge ruler and feeler gauge with a length of 1 000 mm.

6.3.5 The flatness of the bridge frame is measured with a measuring platform with a length of 1,000 mm and a feeler gauge.

6.3.6 The bending radius of the bridge tray and ladder frame bend shall be carried out with steel tape measure and steel ruler with an accuracy of not less than 1 mm.

6.4 Structural performance

6.4.1 The area of the ventilation holes at the bottom of the tray with holes in the bridge frame shall be measured with a steel tape measure, steel ruler or other measuring tools with an accuracy of not less than 1 mm. Row.

6.4.2 The net distance between the layers of the bridge support arm shall be measured with a height gauge, caliper or other measuring tools with the same accuracy with an accuracy of not less than 0.02 mm.

6.4.3 The welding quality of the bridge frame shall be carried out with a caliper with an accuracy of not less than 0.02 mm or other measuring tools with the same accuracy.

6.4.4 The riveting quality of the bridge frame shall be inspected by hand and visually.

6.4.5 The processing and forming quality of the bridge frame shall be inspected by hand and visually.

6.5 Carrying capacity

6.5.1 The mechanical loading method load test of the bridge is carried out in five grades. The load grades are shown in Table 6. When the supporting span is 2 000 mm simply supported beam Under the conditions under the conditions of GB/T 23639-2017, the load test verification is carried out according to the provisions of Appendix A in GB/T 23639-2017.

The uniform load when the initial permanent deformation occurs is the failure load, and the value of the failure load divided by the safety factor K (K=1.5) is the allowable uniform load The permissible uniform load shall not be less than the rated uniform load given by the corresponding load class specified in Table 6, and the size of the bridge shall also satisfy the height less than 80 mm, the width is less than 150 mm, no load test is performed, and the load test verifies the load termination conditions.

a) The maximum stress exceeds 70 MPa;

b) The ratio of the permanent deflection value of the pallet and ladder frame to its span exceeds 1/150;

c) The ratio of the permanent deflection value of the support arm to its span exceeds 1/100;

d) The side plate or supporting arm has obvious buckling and instability that cannot be carried normally.

Note: The mechanical loading method load test method of the bridge is applicable to the product type test and the product manufacturer to make the load characteristic curve of the bridge.

6.5.2 Manual loading method of bridge The load test is divided into five grades. The test load is selected according to Table 7, and the test method is in accordance with GB/T 23639-2017 in Appendix B, the allowable uniform load can be determined by gradually loading the test sample until the test The test when the sample's span midpoint has a permanent deformation of 1/150 of the span, or when the side plate begins to lose stability or the initial permanent deformation occurs The distributed load, divided by the value of the safety factor K (K=1.5), is the allowable uniform load of the bridge tray and ladder frame. The allowable uniform load should not be small The rated uniform load is given in the corresponding load class specified in Table 6.

6.6 Impact resistance

The impact resistance of bridge trays and ladder frames is in accordance with the Eha pendulum method in Chapter 4 in GB/T 2423.55-2006 and the appendix in GB/T 23639-2017 According to the regulations of F, it is evaluated according to the energy level of 2 J, and the number of impacts is one for each.

6.7 Electrical performance

The electrical performance of the bridge shall be carried out in accordance with the provisions of Appendix E in GB/T 23639-2017.

6.8 Surface protection layer

6.8.1 The thickness of the anodic oxide film on the surface of the bridge frame shall be carried out in accordance with the provisions of 5.4.1 in GB/T 5237.2-2017.

6.8.2 The thickness of the electrophoretic paint on the surface of the bridge frame shall be carried out in accordance with the provisions of 5.4.1 in GB/T 5237.3-2017.

6.8.3 The thickness of the paint layer sprayed on the surface of the bridge frame shall be in accordance with the provisions of 5.4.1 in GB/T 5237.4-2017.

6.8.4 The thickness of the paint layer sprayed on the surface of the bridge frame shall be carried out in accordance with the provisions of 5.4.1 in GB/T 5237.5-2017.

7.1 Product inspection

Product inspection is divided into factory inspection and type inspection.

7.2 Factory inspection

7.2.1 Each batch of products must pass the factory inspection by the manufacturer's quality inspection department, and attach the product certificate before leaving the factory.

7.2.2 The factory inspection shall be carried out in accordance with the general inspection level I specified in GB/T 2828.1-2012 and the one-time sampling plan for normal inspection.

The unqualified classification, inspection items, and acceptance quality limits of the factory inspection are shown in Table 8.

7.2.3 The sample size and judgment array of the factory inspection are shown in Table 9.

7.2.4 When the batch is judged to be unqualified by the factory inspection, the manufacturer should reorganize and rework the batch of products and perform the factory inspection again. It must be re-inspected before it can leave the factory.

7.3 Type inspection

7.3.1 Type inspection shall be carried out in one of the following situations.

a) When a new product or an old product is transferred to the factory for approval;

b) When there are major changes in structure, materials, and processes;

c) When the product has been discontinued for more than half a year and production is resumed;

d) When the quality is disputed; […]