Precautions for construction of trenchless COD tube
Precautions for construction of trenchless COD tubeWhen the burial depth of the cluster pipe is less than 0.5m and when crossing the bridge, it is protected by C15 concrete encapsulation or galvanized steel pipe. Before laying the bundled pipes, the construction unit should consider the length of each section in the whole section, scientifically arrange the plates, do not break the pipes at will, and reduce pipe waste and pipe connection. Attention should be paid to the distribution: try to avoid joints. The joints not considered in this paragraph are only allowed to have one joint in the circumstances. The matching sealing joints should be used for connection, that is, the use of engineering plastic threaded pipe and sealing ring for the assembly and disassembly of mechanical seal connections. The interface section of the cluster tube should be straight and thorny. During the connection process, debris, water and other debris should be prevented from entering the cluster pipe. The cluster pipe and the pipe connection should be checked for air tightness after assembly, and the gas should be inflated by 0.1Mpa. In the same section (between two hand holes), each joint of each cluster pipe should be staggered 10 meters from each other. Optical cable is a transmission tube widely used in the communication industry.
Quota should be set for the construction of COD cluster pipes in Huai South Africa
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.
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The backfill soil should be 10-15 cm above the ground, and manually tamped if necessary. C15 concrete trenches shall be sealed in the easy-to-wash areas. For long-distance bundled pipes, markers should be buried in the route, and markers should be set at intervals of 200 meters in the straight section of the pipeline, which should comply with YDJ44-89 regulations of the Ministry of Posts and Telecommunications. When laying the tube, the operator will lift it into the tube trench and tube box every 10 meters, without rubbing with the ground, keeping the pipeline straight, without twisting, twisting and other phenomena. The cluster tubes should be placed in an orderly manner when they enter the trench. And as far as possible to straighten the bundle tube, in order to prevent confusion, strapped with packing tape every 5 meters. The continuous micro-bending and multiple ups and downs of the bundling tube in the trench will have a significant adverse effect on the air-blowing cable. The loose soil of the slope shall be enclosed in sections by concrete. Bundle tube connection: The specifications and program of the sealed connection fittings of the bundle tube should meet the design requirements. Special tools should be used to cut and connect the cluster tubes. Joint points should not be set as far as possible in the perennial or seasonal water accumulation section.
Quota should be set for the construction of COD cluster pipes in Huai South Africa
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.
Quota should be set for the construction of COD cluster pipes in Huai South Africa
However, how to make good use of pipelines and improve the cost performance of leased pipelines is also a problem that cannot be ignored. This article discusses from the aspects of optical cable selection and distribution, hoping to provide some reference for those engaged in related work. The cluster tube is a kind of communication plastic pipe. Like most pipes, there are a series of specifications and models. The specifications and models are different. The scope of use is definitely different. Of course, the price is also different. So questions like "how much is the cluster tube?" Are as unanswerable as "how much is the mobile phone". Collector tube specifications and model issues: Generally, there will be a purchase detail list before purchase, which contains the details of the specifications, model, weight, material, color, etc. of the required items. If you see these things, all are directly presented to the product Provider. So that they can provide you with a quotation plan for your product in a short time. If there are no detailed purchase instructions, you need to at least determine the required tube specifications.
Quota should be set for the construction of COD cluster pipes in Huai South Africa
Note that the machining accuracy and smoothness of the working surface of the mandrel in the mold must be strictly manufactured, and the rent roughness R8 should not be greater than o. 32y ". The formed composite pipe should be slowly cooled down, and the temperature of the cooling water in the water tank should be controlled within the range of 12-16 ° C. The traction speed matches the extrusion speed of the tube blank, and the traction speed of the extruded composite pipe is controlled at Within 10m / min. The production of the communication manifold is a systematic project, from the selection of raw materials to the selection of production equipment to the adjustment of production processes, etc., until the storage of finished products after inspection is qualified, there should be precise control, so that Production of first-class quality bundled tubes. The construction of highway communication pipelines is a part of highway construction. The primary use of highway communication pipelines is mainly used for laying optical fiber and emergency telephone cables for highway electromechanical systems, and leased by national departments such as national defense. With the continuous improvement of road network construction, more and more communications use the way of renting highway pipelines to lay trunk optical cables.
