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Code for acceptance of telecommunication cable line engineering
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GB 51171-2016
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Basic data | Standard ID | GB 51171-2016 (GB51171-2016) | | Description (Translated English) | Code for acceptance of telecommunication cable line engineering | | Sector / Industry | National Standard | | Classification of Chinese Standard | P76 | | Word Count Estimation | 168,191 | | Date of Issue | 2016-04-15 | | Date of Implementation | 2016-12-01 | | Quoted Standard | GB 50374; GB 4208; YD/T 694; YD/T 778; YD/T 1460.3 | | Regulation (derived from) | Ministry of Housing and Urban - Rural Development Notice No. 1095 of 2016 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This standard applies to the land of new communication line engineering and alteration, expansion of communication line project acceptance. | GB 51171-2016: Code for acceptance of telecommunication cable line engineering---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to make the construction of communication lines conform to the relevant national policies, achieve advanced technology, reasonable economy, energy saving and environmental protection, and ensure that the materials, construction and completion acceptance indicators in the construction of communication optical (electrical) cable lines meet the design requirements, this document is formulated specification.
1.0.2 This specification is applicable to the acceptance of new land communication line projects and reconstruction and expansion of communication line projects.
1.0.3 The program, specifications, quality, etc. of the equipment used in the project shall comply with the provisions of the approved engineering design documents, and unqualified equipment shall not be used.
1.0.4 When constructing communication lines in areas with seismic fortification intensity above 7 degrees (including 7 degrees) in my country, the seismic performance of communication facilities should be considered according to the design requirements.
1.0.5 In addition to the implementation of this specification, the acceptance of the communication line project should also comply with the relevant current national standards.
2 terms
2.0.1 Microtubules microducts
Microtube is a small size (its maximum outer diameter is not more than 16.0mm), light weight soft round plastic tube.
2.0.2 Microduct bundles microduct bundles
Microtubule bundles are bundles of microtubules formed by a certain number of microtubules bundled together.
2.0.3 cable of microduct
The umbilical cable is a cable made of a certain number of microtubes, with an outer sheath, and with certain protective measures (such as a moisture barrier).
2.0.4 microduct optical fiber cable for in-stallation by blowing
The air-blown micro-optical cable (referred to as micro-cable) is suitable for laying in the micro-pipe by the air-blowing method at the same time. The size is small enough, and its diameter ranges from 3.0mm to 10.5mm. mm ~ 16.0mm optical cable with three conditions.
2.0.5 closure for microduct optical fiber cables
A protective connection between two or more miniature fiber optic cables.
3 Equipment inspection
3.1 General provisions
3.1.1 During the optical (electrical) cable and equipment inspection, the representative of the construction party or supervisor and the representative of the construction party should be present at the same time.
3.1.2 The program, specification, model, quantity, etc. of optical (electrical) cables and other line equipment shall comply with the design requirements. The factory data of optical (electrical) cables, silicon core plastic tubes and other line equipment should be complete, and there should be product quality inspection certificates and product test records submitted by the manufacturer. Line equipment that does not meet the design requirements or does not have a factory inspection certificate shall not be used in the project.
3.1.3 Optical (electrical) cables, equipment and equipment should be visually inspected, the packaging should be complete, and the outer packaging should be marked with the program, specification, model and quantity.
3.1.4 The outer packaging and outer sheath of the cable should be intact, and the packaging of the optical (electrical) cable end and the silicon core plastic tube end should be intact.
3.1.5 The actual A and B terminals of the optical (electrical) cable should be checked during the opening inspection of the optical (electrical) cable, and marked correctly and eye-catchingly on the cable reel.
3.1.6 Optical (electrical) cables and other line equipment should be recorded after inspection.
3.2 Optical cable single reel inspection
3.2.1 The main inspection items for a single-reel optical cable should include retesting the length of the optical fiber, measuring the loss of the optical fiber, and observing the curve of the backscattered signal of the optical fiber.
3.2.2 Optical fiber transmission characteristics should meet the design requirements. The length of the disk should meet the design requirements and match the nominal length of the factory.
3.3 Cable Single Reel Inspection
3.3.1 The main inspection items for single-reel cables should include inspection of defective wire pairs, inspection of sealing performance of cable sheath, inspection of ring resistance of wire pairs, inspection of insulation resistance, and withstand voltage inspection.
3.3.2 The chromatogram or sequence of communication cable core wires should meet the standards, the core wires are intact and there should be no broken wires, mixed wires, ground gas and poor insulation.
3.3.3 The main electrical characteristics and insulation index inspection of copper core all-plastic cables shall comply with the provisions of Appendix A of this specification.
3.3.4 The filling of filled cables should be even and full.
3.3.5 Inflatable cables should be filled with dry gas. After the air pressure reaches 30kPa ~ 50kPa and stabilizes for 3 hours (6h for armored cables), the air pressure value of the cable should not drop. Cables whose sealing performance does not meet the above requirements shall not be used.
3.3.6 The hanging wire of the self-supporting optical (electrical) cable should be parallel to the optical (electrical) cable. The steel strands should be tightly twisted, and the steel strands should not be loose after stripping off the.200mm plastic sheath at the end.
3.4 Pole Inspection
3.4.1 The inspection of circular reinforced concrete poles shall meet the following requirements.
1 Conical circular reinforced concrete pole, the taper should be 1.75.
2 The appearance quality of concrete poles shall meet the following requirements.
1) There must be no circumferential and longitudinal cracks on the surface of prestressed concrete poles and partially prestressed concrete poles. Reinforced concrete poles shall not have longitudinal cracks, and the width of circumferential cracks shall not be greater than 0.05mm.
2) There should be no slurry leakage at the edging and seam of the pole, and at the junction of the steel plate and the shaft.
3) There should be no local bruises on the pole.
4) The inner and outer surfaces of the pole must not leak steel bars, the inner surface must not have concrete slump, and the outer surface must not have honeycombs.
5) There should be no pockmarks or sticky skin on the surface of the pole.
6) The concrete around the reserved holes (pieces) should not be damaged.
3 When the concrete has one of the following conditions, it can be used after repairing.
1) The total area of local pockmarks or sticky skin per meter of length on the surface of the pole shall not exceed 5% of the external area of the same length.
2) The depth of slurry leakage at the mold edge joint of the pole is not greater than 10mm, the length of each leakage is not greater than 300mm, the cumulative length is not greater than 10% of the length of the pole, and the overlapping length of symmetrical slurry leakage is not greater than 100mm.
3) The joint surface of the steel ring or flange and the shaft has a slurry leakage, the depth is not greater than 10mm, the circumferential length is not greater than a quarter of the circumference, and the longitudinal length is not greater than 50mm.
4) Partial bruises on the pole, the depth is not more than 10mm, and the area of each place is not more than 50cm2.
4 The allowable deviation of concrete pole size shall meet the following requirements.
1) The allowable deviation of the length of the whole pole is -40mm～+20mm, and the allowable deviation of the length of the assembled pole is ±10mm.
2) The allowable deviation of the outer diameter of the pole is -2mm~+4mm.
3) The allowable deviation of the wall thickness of the pole is -2mm~+10mm.
4) The allowable deviation of the distance between the reserved holes in the longitudinal direction is ±4mm. The allowable deviation of the diameter of the reserved hole is +2mm.
5 The name or trademark of the manufacturer should be marked on the surface of the pole. Electric poles with a tip diameter of not less than 190mm should be marked at a distance of 3.5m from the root end of the pole, and electric poles with a tip diameter of less than 190mm should be marked at a distance of 3.0m from the root end of the pole.
6 The product delivery certificate should be signed and sealed by the technical inspection department of the manufacturer, and should include the manufacturer's name, trademark, address, telephone number, production date, delivery date, implementation standards, product varieties, specifications, load levels, concrete compressive strength Test results, test results of tensile strength of longitudinally stressed steel bars, test results of appearance dimension deviation, test results of mechanical properties, etc.
3.4.2 When it is difficult to determine the quality of concrete pole appearance inspection, relevant units can be notified to conduct mechanical appraisal together with the manufacturer.
3.4.3 Wood pole inspection shall meet the following requirements.
1 The oil immersion depth and root anticorrosion treatment of oiled wooden poles shall meet the design requirements.
2 Wooden poles are not allowed to be used in any of the following situations.
1) The length deviation exceeds +200mm~-100mm;
2) The tip diameter is less than 10mm from the nominal tip diameter;
3) The shaft bend exceeds 2% of the shaft length.
3.5 Silicon core plastic pipe and accessories inspection
3.5.1 The outer diameter and wall thickness of the silicon core plastic pipe shall comply with the requirements in Table 3.5.1; the nominal length shall comply with the design requirements.
Table 3.5.1 Silicon core plastic pipe specifications (mm)
3.5.2 The shape of the silicon core plastic tube should be uniform, the color should be uniform, and the appearance should be free from damage, defect, scratch, crack, obvious depression or protrusion, and no air bubbles.
3.5.3 Inflate 0.1MPa in the single-disk silicon-core plastic tube, and the pressure drop after 24 hours should not be greater than 0.01MPa.
3.5.4 The connecting piece and the silicon core plastic pipe should match, the inner and outer walls of the connecting piece should be smooth and free of defects, and the spiral fit between the two should be good.
3.5.5 The rubber of the plug should not fall off or break, the plug should match the silicon core plastic pipe, and when installed on the silicon core plastic pipe, it should be firm and free from water and sundries.
3.6 Inspection of galvanized steel strand and iron parts
3.6.1 The surface of the galvanized steel strand should be uniform and smooth, without defects such as burrs, cracks, scars and corrosion.
3.6.2 The twisting of galvanized steel strands should be uniform and tight without strand skipping.
3.6.3 The specifications and characteristics of galvanized steel strands shall comply with the provisions in Table 3.6.3.
Table 3.6.3 Specifications and characteristics of galvanized steel strands
3.6.4 The length of a single galvanized steel strand shall not be less than.200m.
3.6.5 Iron parts of overhead communication lines shall meet the following requirements.
1 The material and dimensions of the iron products shall comply with the design regulations or the technical regulations of the manufacturer.
2 The straightness error of iron products should not exceed 0.5% of the total length of iron products.
3 Iron products shall not be welded or forged unless specified.
4 Iron products should not have defects such as cracks and burns, and dents not exceeding the allowable tolerance of the material and burrs not larger than 0.2mm are allowed.
5 Iron products except nuts and cable hooks can be electroplated products, other line iron products are all hot-dip galvanized.
6 The anti-corrosion treatment on the surface of iron parts should meet the design requirements, the galvanized layer of iron parts should be firm, there should be no bubbles, peeling, pinholes and zinc deficiency, and there should be no protruding zinc dross and zinc nodules in the matching parts.
3.7 Inspection of joint box and joint sheath
3.7.1 Inspection of optical cable splice box and optical cable terminal box shall comply with the following regulations.
1 The shape of the joint box should be complete, and the plastic parts should be free from defects such as burrs, air bubbles, cracks, cavities, warping and impurities, and the background color should be uniform and continuous; the surface of metal parts should be smooth, uniform in color, and the coating or plating should have firm adhesion.
2 Accessories and special tools, product instruction manual, product certificate and packing list should be complete, complete and valid.
3.7.2 The all-plastic cable joint sheath shall meet the following requirements.
1 The surface of the cable joint sheath is smooth and free of marks, the material is uniform in thickness, and the spare parts are complete and effective.
2 The surface of the main plastic parts of the heat-shrinkable tube should be smooth and smooth, with uniform color, no bubbles, blisters, scratches, and cracks; the surface of metal parts should be free of burrs and rust; rubber and other sealing materials should have no visible inclusions.
3 The hot-melt adhesive surface of the heat-shrinkable sleeve, the injection rod of the injection-molded sleeve, and the sealing strip or seal of the assembled sleeve should be protected against moisture and dust. The surface of the heat-shrinkable material should have a temperature indicator.
3.8 Inspection of cable lugs
3.8.1 The appearance of the cable buckle terminal should be complete, the shell material should be transparent, and the clip connection should be firm.
3.8.2 The terminal block of the cable module should not be broken, the appearance should be complete, and the clip connection should be firm.
3.9 Distribution frame inspection
3.9.1 Inspection of optical fiber distribution frame shall comply with the following regulations.
1 The surface coating layer of the optical fiber distribution frame should be smooth, uniform in color, no sagging, no exposed bottom, and no burrs or rust on the metal parts. The identification on the optical fiber distribution frame should be complete, clear, correct, durable and reliable.
2 The functional modules of the optical fiber distribution frame should be complete and fully assembled.
3 The insulation resistance and withstand voltage between the high-voltage protective grounding device of the optical fiber distribution frame and the frame shall meet the design requirements, and shall comply with the relevant provisions of the current industry standard "Fiber Optical Distribution Frame" YD/T 778.
3.9.2 The inspection of optical fiber active connectors shall comply with the following regulations.
1 The optical fiber active connector should be free from dirt, burrs, cracks, looseness, deformation or parts displacement, and the marking should be clear.
2 The plug and adapter of the optical fiber active connector should be inserted and pulled out smoothly and lightly, and the clips should be strong, elastic, and plugged in and out normally.
3 The optical cable of the optical fiber active connector should be smooth and bright, free of impurities and damage, with clear printing, and the color should meet the product requirements.
4 Insertion loss and return loss should meet the design requirements.
3.9.3 The inspection of the cable distribution frame shall comply with the following regulations.
1 The surface coating layer of the cable distribution frame should be smooth, uniform in color, free from sagging and exposed bottom, and the marking on the distribution frame should be clear, complete and correct.
2 The coating (plating) layer of metal parts should be uniform, without obvious difference, without scratches, rust and peeling.
3 The color of plastic parts should be uniform without obvious difference, without cracks and scratches.
4 Fasteners should be complete and installed firmly, and components such as frame body and wiring bar should be horizontal and vertical.
5 The marks on the cable distribution frame shall be complete, clear, correct, durable and reliable.
6 The protective ground wire of the cable distribution frame, the insulation resistance between any two terminals that are not connected to each other, and the insulation resistance between any terminal and the metal fixing piece, and the overvoltage and overcurrent devices of the security unit shall comply with the current industry standard "General Distribution frame "YD/T 694 related regulations.
3.10 Handover box inspection
3.10.1 The inspection of optical cable transfer box shall comply with the following regulations.
1 The connection of all fasteners shall be firm and reliable, and the appearance of metal structural parts with electroplating treatment shall not have visible rust spots. The metal components shall not have burrs, the structural parts shall not be distorted, the surface of the cabinet shall be smooth and smooth, the color shall be uniform, and there shall be no traces of mechanical scratches, and the parts of the cabinet shall not have obvious color difference.
2 The sealing strip of the box body should be flat and firm, the door lock can be opened and closed flexibly, the box door can be opened flexibly, and the surface coating of the coated metal components has firm adhesion without defects such as peeling and paint falling off.
3 The functional modules of the optical cable transfer box should be complete and fully assembled.
4 There should be obvious marks at the protective earthing place. The equipment should have a clear line sequence identification.
3.10.2 The cable transfer box shall meet the following requirements.
1.The box body of the cable junction box should be complete, free from damage, corrosion-free, with complete spare parts, tight box shell, and flexible and reliable door lock opening.
2.The topcoat of the box body should have a uniform, smooth and smooth appearance, and the paint film should be firmly attached, and there should be no hanging, scratches, exposed bottom, air bubbles and whitening.
3 Screws, nuts and flat washers forming terminals shall be nickel-plated.
4 Screws, nuts and flat washers used for fastening and metal components not coated with paint shall be galvanized.
3.10.3 The sealing performance of optical cable transfer boxes and cable transfer boxes shall be inspected in the factory inspection records, and shall comply with the relevant requirements of the current national standard "Enclosure Protection Level (IP Code)" GB 4208.
3.11 Inspection of micropipes, micropipe bundles, umbilical cables and micropipe accessories
3.11.1 Any cross-section of micropipes, microtube bundles and umbilical cables should be uniform and free from pores or blemishes. Internal and external surfaces shall be free from visible cracks, pinholes, joints, water spots, repairs and any other defects.
3.11.2 The chromatogram of the microtubes should comply with the relevant provisions of YD/T 1460.3 of the current industry standard "Air-blown Micro Optical Fiber and Optical Fiber Units for Communication - Part 3 Microtubes, Microtube Bundles and Microtube Accessories".
3.11.3 The allowable deviation of the nominal value of the standard manufacturing length of the microtube is 0~+5%.
3.11.4 Microtubes whose sealing performance does not meet the design requirements shall not be used.
3.11.5 Microtube accessories should meet the following requirements.
1 The direct head of the microtube should be plug-in and easy to connect.
2 The sealing end caps of micropipes and micropipes and microcables should have good sealing performance, and should be able to prevent sediment and water from entering the pipeline.
3 The connection of the micropipe connector should not be loosened or deformed.
4 The main performance test and mechanical performance test report data of micro-pipe water plugging joints and micro-pipe air plugging joints should meet the design requirements.
3.12 Inspection of other circuit equipment
3.12.1 The program and allowable deviation of the cement chassis, chuck and cable reel shall comply with the provisions in Table 3.12.1.
Table 3.12.1 Programs and allowable deviations of cement chassis, chucks and cable reels
3.12.2 Plastic sub-pipes should meet the following requirements.
1 The material and specifications of the plastic sub-pipe should meet the design requirements.
2 The plastic sub-pipe should have a smooth appearance without deformation, and its color, aperture and wall thickness should meet the design requirements.
4 Line Routing
4.0.1 The route construction survey should be based on the approved design and the red line approved by the planning department. When there is a route change, the route change procedure should be handled.
4.0.2 During the line construction survey, the specific location and protection measures for communication lines crossing obstacles such as railways, highways, rivers, lakes, large water channels, and underground pipelines should be checked.
4.0.3 The length and protective measures of anti-corrosion, anti-termite, anti-strong electricity, anti-lightning and other sections should be verified during line construction measurement.
4.0.4 During the construction measurement of directly buried optical (electrical) cable lines and silicon core plastic pipeline lines, the ground distance should be measured along with the terrain; the distance between the centers of man (hand) holes should be measured for pipeline optical (electrical) cable lines; The straight-line distance between the two poles should be measured.
4.0.5 The minimum clear distance between directly buried optical (electrical) cables, silicon-core plastic pipes and other building facilities shall comply with the provisions in Table 4.0.5.
Table 4.0.5 Minimum clear distance between directly buried optical (electrical) cables, silicon core plastic pipes and other building facilities (m)
Note. 1 When direct buried optical (electrical) cables are protected by steel pipes, the clear distance between them and water pipes, gas pipes and oil pipelines shall not be less than 0.15m;
2 For pole roads, guy wires, isolated trees and towering buildings, lightning protection requirements should also be met;
3 Large trees refer to trees with a diameter at breast height of 0.3m and above;
4 When passing through various underground pipelines whose buried depth is similar to that of optical (electrical) cables, optical (electrical) cables should pass under the pipelines and protective measures should be taken;
5 When the minimum clear distance cannot meet the requirements in the table, effective protection measures should be taken according to the design requirements.
4.0.6 When the overhead communication line approaches or crosses other facilities, the separation distance shall comply with the following regulations.
1 The minimum horizontal clear distance between the pole road and other facilities shall meet the requirements in Table 4.0.6-1.
Table 4.0.6-1 Minimum horizontal clear distance between pole road and other facilities
Note. In a narrow area, when the proposed overhead optical cable is laid in parallel with the existing overhead line, if the spacing cannot meet the above requirements, the pole road sharing or other methods of laying the optical (electrical) cable line should meet the spacing requirements.
2 The installation height of overhead optical (electrical) cables shall not be lower than the requirements in Table 4.0.6-2.
Table 4.0.6-2 Erection height of overhead optical (electrical) cables
3 The minimum vertical clear distance for overhead optical (electrical) cables passing over other electrical facilities shall not be less than the provisions in Table 4.0.6-3.
Table 4.0.6-3 Minimum vertical clear distance for overhead optical (electrical) cables crossing other electrical facilities
Note. 1 When the power supply line is a covered line and the minimum clear distance does not meet the requirements of the table, the optical (electrical) cable should cross over the power supply line;
2 When the optical (electrical) cable crosses the power supply line, the poles and suspension wires on both sides of the spanning gear shall be installed with reinforced protection devices;
3 The communication line should be erected at the lower position of the power line, and at the upper position of the trolley wire and catenary.
4.0.7 Directly buried optical (electrical) cable joint pits and silicon core plastic pipe man (hand) holes should be arranged in places with relatively high terrain and relatively peaceful geological stability, and should avoid ponds, river canals, roads and joints that may The location of the disturbance.
5 soil (stone) square
5.1 Excavating optical (electrical) cable trenches and potholes
5.1.1 If buried objects, cultural relics, ancient tombs, etc. are found during excavation of ditches (pit), the construction shall be stopped immediately, and the site shall be protected. The construction unit shall not continue construction in this area until a proper solution is obtained.
5.1.2 Pole holes shall meet the following requirements.
1 The depth of the pole hole shall comply with the provisions in Table 5.1.2, and the allowable deviation of the hole depth is ±50mm. The measurement of the depth of a pole hole with temporary accumulation of soil on the surface shall take the permanent ground as the starting point for calculation.
Table 5.1.2 Hole Depth of Aerial Optical (Electric) Cable Pole
Note. 1.The hole depth of special electric poles over 12m shall comply with the design documents;
2 This table is applicable to newly-built communication lines in medium and light load areas, and the depth of pole holes in heavy load areas should be increased by 0.1m to 0.2m according to the value specified in this table;
3 The hole depth of the pole support rod should not be less than 0.6m, and the special circumstances meet the requirements of the design documents;
4 The depth of the high pile hole for high pile pulling shall meet the following requirements. the depth of the pile hole for ordinary soil, hard soil and gravel soil shall not be less than 1.2m; the depth of the stone hole shall not be less than 0.8m.
2 The depth of the electric pole hole on the slope shall be calculated from the point 0.15m to 0.2m downward from the slope of the hole (Figure 5.1.2).
Figure 5.1.2 Schematic diagram of the measurement method for the depth of the electric pole hole on the slope
1-Slope standard hole depth; 2-Depth measured on the slope of the hole
3 The bottom of the pole hole should be flat.
5.1.3 Anchor pits for guy wires shall meet the following requirements.
1 The anchorage pit depth for guy wires shall comply with the requirements in Table 5.1.3, and the allowable deviation shall be ±50mm.
Table 5.1.3 Anchor Pit Depth for Guy Wires
2.The ground anchor pit of the suspension plate guy wire shall be 0.2m~0.3m deeper than the ground anchor pit of the floor guy wire.
3.The bottom of the guy wire ground anchor pit should be flat, the slope of the notch should be consistent with the angle of the guy wire, and the slope should be smooth.
5.1.4 Optical (electrical) cable trenches and silicon core plastic duct trenches shall meet the following requirements.
1 Optical (electrical) cable trenches and silicon core plastic pipe trenches should be straight without serpentine bends; the bottom of the trench should be flat, and the bottom of the trench should be slowly sloped at the trench and slope.
2 The silicon core plastic pipeline groove should maintain a gentle transition at the ridge and corner. The corner radius of the corner of the φ50/42mm and φ46/38mm silicon core pipeline groove should be greater than 550mm, and the corner radius of the φ40/33mm silicon core pipeline groove should be Greater than 500mm.
3 The excavated road surface and excavated stones should be piled up separately from the soil, and soil should not be piled on other optical (electrical) cable marker stones and fire hydrants.
4 When blasting is used to open ditches in rocky areas, the width of the ditch bottom shall not be less than.200mm, and 100mm of crushed soil or sand shall be placed on the rocky ditch bottom.
5 When optical (electrical) cable trenches and silicon-core plastic pipe trenches pass through the quicksand zone, optical (electrical) cables and silicon-core plastic pipes should be laid in time to prevent landslides; in areas where landslides are serious, they can be laid while digging trenches.
6 When laying silicon core pipes on the road shoulders and intermediate isolation belts of the expressway, the design and the elevation given by the highway department should be verified.
5.1.5 The burial depth of directly buried optical (electrical) cables shall comply with the provisions in Table 5.1.5.
Table 5.1.5 Burial depth of direct buried optical (electrical) cables
Note. 1 The design depth of road side ditch is the depth required by the road or urban construction management department. The depth of the artificial grooved stone side ditch shall not be less than 0.4m, and the ditch shall be sealed with anti-scouring materials such as cement mortar according to the design requirements;
2 The rocky and semi-rocky sections should be paved with 0.1m thick crushed soil or sand on the bottom of the ditch and above the optical cable;
3 The above table does not include the buried depth requirements of the permafrost zone, and the buried depth shall comply with the engineering design regulations.
5.1.6 The burial depth of silicon-core plastic pipes shall meet the requirements in Table 5.1.6.
Table 5.1.6 Burial depth of silicon core plastic pipes
Note. 1 The burial depth of artificially grooved stone ditch and road (railway) road stone side ditch shall not be less than 0.4m, and the ditch shall be sealed with anti-scouring materials such as cement mortar according to the design requirements. The hard shoulder shall not be less than 0.6m;
2 The width of the bottom of the pipeline trench should be greater than the width of the pipe group arrangement, and each side should not be less than 0.1m;
3 Excavate pipeline ditches in the central isolation zone or road shoulder of the expressway. The burial depth of the silicon core plastic pipe and the arrangement width of the pipe group are determined, and the columns of the anti-collision barrier of the expressway should be avoided.
5.1.7 The buried depth of underwater optical (electrical) cables shall comply with the provisions in Table 5.1.7.
Table 5.1.7 Burial depth of underwater optical (electrical) cables
Note. The uphill slope of the optical (electrical) cable on the beach should be less than 30°.
5.2 Backfill
5.2.1 The backfill soil of electric pole holes, cable pits, and pole holes shall be tamped layer by layer, and tamped once every 300mm of backfill. The backfill of the access road in the urban area should be higher than the original ground by 50...
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