Analysis of the market situation of trenchless COD cluster tube
After the heating of the cluster tube is completed, the to-be-connected parts should be quickly disengaged from the butt-connected heating tool, and uniform external force should be applied to make it completely contact to form a uniform flange. The on-site inspection of the cluster tube shall meet the following requirements, and the tube shall be in accordance with the test report and certificate of conformity of the material testing center. The specification program and quantity of all cluster tubes, joint parts and other related materials should be checked and counted, and the outer packaging of all cluster tubes, joint parts and other related materials should be checked and recorded. High-quality and complete accessories such as cluster pipe fittings, joints and sealing plugs. The tube body and nozzle of the bundled tube shall not be deformed, the connecting parts are complete and effective, and the inner diameter of the casing (tube ferrule) and the outer diameter of the socket shall coincide. The appearance of the collecting tube should be uniform and uniform, without defects, scratches, the inner and outer walls of the tube should be smooth, flat and clean, no bubbles, cracks, and significant depressions and impurities are allowed. It is perpendicular to the axial direction, the inner and outer walls are tightly melted, and the color of the collecting tube should be uniform.Connect the other end of the gas pipe to the air compressor. Turn on the air compressor. When the pressure gradually rises, release the air pressure to blow the sponge ball in from one end of the tube and out from the other end. Put the sponge ball and the test stick sticked with lubricant into the tube, connect the through and bundling tube, and connect the air compressor and the through with the gas pipe. After the air pressure of the air compressor rises, slowly open the purge valve to supply the air. The identification of the unblocking of the collecting tube is mainly based on the ejection of the test tube by the high-pressure air flow according to the outlet end of the collecting tube, which is regarded as the unblocked tube. Barriers to distinguish cluster tubes. In the gas supply penetration, if there is no large amount of drainage at the outlet end of the cluster tube, and the amount of air output is very small, and the cork and sponge are not ejected, it can be determined that the cluster tube is obstructed. It is obviously not enough to have perfect temperature control if you want to produce high-quality communication bundles. Combining years of production experience, it is concluded that in addition to temperature, the following points are also very important in the production process of the cluster tube. When the inner and outer layers and color lines of the polyethylene bundling tube are molded with HDP resin.
The friction coefficient of the inner wall of the tube is static: ≤0.25 (flat plate method, HDPE standard test bar), dynamic: ≤0.15, tensile strength (MPa) ≥21, elongation at break (%) ≥350 When the traction load (N) ≥ 8000, cold bending radius (mm) 400, ring stiffness (KN / m2) ≥ 50 of the bundled tube, the flat test is pressurized vertically until the deformation of the outer diameter is 50% of the original outer diameter. Under load, the sample does not rupture or delaminate. Bundle tube recovery rate (%) When the pressure in the vertical direction is increased to 50% of the outer diameter deformation, immediately unload, the sample does not break or delaminate, and the outer diameter can naturally recover to more than 85% of the original diameter in 10 minutes . Before laying optical (electrical) cables and bundled pipes, re-routing should be conducted. The routing and laying method shall be based on the red line approved by the planning department and the approved construction drawing design. Necessary route changes can be proposed by supervision and construction personnel, and confirmed by the construction unit; for larger route changes of more than 500m.
In the construction of special sections, the laying of optical cables (bundle tubes) is strictly in accordance with the design requirements, and the pipeline anti-corrosion layer and the pipeline spanning structure should not be damaged during construction. The cleaning and excavation of the trench of the optical cable (bundle tube) shall meet the following requirements: before laying of the optical cable (bundle tube). The pipeline should be cleaned and leveled to fill the soil once. The trench should be smooth and straight. The position, depth and width of the trench in the trench should meet the design requirements. Before laying the collecting tube, check whether the sealing of the collecting tube is tight. During laying, water, soil, mud and other debris are strictly prohibited from entering the collecting tube. The construction of the optical cable (collecting tube) should be laid according to the design trend and position. The laying of optical cables (bundle tubes) can be carried out by means of 'manual lifting method', 'fixed trailer method' and 'movable trailer method'. After passing under the obstacle, the optical cables (bundle tubes) should be lifted immediately to avoid the optical cables (bundles) Tube) Rubbing with the ground, passing through obstacles should have special care. The optical cable (bundle tube) should be laid straight, without bending, twisting, or winding.
Ensure that the technical requirements of the project are met. Lifetime responsibility for the quality of cluster tube products. During the quality assurance period, if there are quality problems in the products themselves (except for the damage caused by the user or the loss caused by irresistible natural disasters), the quality of the project will be affected.
It is strictly forbidden to use blowtorch or other heating methods to make the bundle tube soft and bend. When the pipe ditch belongs to the paddy field, the bottom of the ditch should be filled with sand (soil) bags before laying, and then the bundled tube will be flattened. After the cluster tube is laid under the obstacle, the cluster tube should be lifted immediately to avoid the damage of the tube skin. After the deployment, the soil should be backfilled to minimize the time of the tube and avoid any artificial or other damage to the tube. The joints of the cluster pipes shall not be arranged under the subsidence of perennially accumulated depressions, ponds, dams, railways and highways. Only by grasping the rules for laying of cluster tubes can they be used flexibly in the construction process and work out high-standard and qualified communication projects.
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