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BEIHAI YUEDA FRP PRODUCTS
The maximum burial depth of fiberglass reinforced sand pipes.
Release time:
2022/12/13
The fiberglass sand-clad pipeline has a maximum burial depth of 5 meters under the premise of bearing capacity for transportation. When maintaining the fiberglass sand-clad pipeline, first, the bulging part of the pipeline and the damaged layers of the internal structure and weathered layers should be ground away using a grinder. Then, replace it with asbestos wool putty for sufficient filling. After the putty has set, use the grinder to polish the filled area and the covering material, ensuring that the surface is both smooth and has good adhesion. Finally, carry out strong leak-proof treatment on the covering.
The maximum burial depth of the fiberglass sand-clad pipe refers to the relative height of the fill above the top of the pipe. The bending stiffness of the fittings of the fiberglass sand-clad pipe and the type of original soil are set as follows: if the original soil is non-medium fine sand clay, the diameter of the fiberglass anti-corrosion pipe should not be less than 300mm, with a bending stiffness level of 5000N/m2. According to the standards, in the absence of traffic load-bearing capacity, the maximum burial depth is 8m; under the condition of traffic load-bearing capacity, the maximum burial depth is 5m.
In areas where vehicles or trains with weight-bearing requirements are present, all backfill within the pipeline area must be compacted in layers. If special assemblies are used, such as adding a concrete structural insulation layer, reinforced concrete cover plates, or shells, the depth of coverage should be appropriately reduced. Considering the load-bearing capacity of the road surface, the minimum burial depth for trench excavation should not be less than 1m. When repairing fiberglass sand-clad pipes, first, the bulging part of the pipe, the internal structure layers, and the damaged weathered layer should be ground off with a grinder. Then, replace it with asbestos putty for sufficient filling. After the putty has set, polish the filled area and the covering content with a grinder to ensure the surface is smooth and has good adhesion. Finally, perform strong anti-seepage treatment on the covering. The length of the covering area (on the circular position) should have a bonding length of no less than 30cm for both damaged and undamaged areas, and the anchoring length in the width direction should be no less than 15cm. The thickness of the covering for the damaged area and the degree of damage should be between 8 to 15mm. The covering process for the damaged position of the pipe mainly involves using epoxy resin to apply 2 layers of chopped glass mat for external anti-seepage, and then applying 10 to 20 layers of No. 04 fiberglass cloth for reinforcement. Then, perform internal anti-seepage treatment, first applying 3 layers of chopped glass mat, followed by 1 layer of fiberglass cloth for reinforcement. Finally, use polyester film to smooth the surface, keeping the repair area as smooth as possible.
The solid layer of the fiberglass sand-clad pipe is composed of a complex layered structure including the inner surface, secondary inner surface, installation layer, weathered layer, and outer surface. Generally, only the bending stiffness of the laminated wall is considered, which is composed of the winding layer and the weathered layer. However, when the lining layer accounts for the majority of the wall thickness, or when the effect of bending stiffness is positively correlated, the bending stiffness of the lining layer should be considered. There are mainly two types of winding layers in the system: helical winding layers and annular winding layers. The former can adjust the reciprocating radial speed of the guide wire small car, providing a uniform rotation effect within the shaft neck.
In this case, a helical winding with a certain laying angle is formed. The selection of the laying angle should meet the design points of wall thickness axial strength stiffness and axial stiffness and strength.
The annular winding layer is generated at an angle of approximately 90° to the centerline of the pipe, primarily providing the annular strength stiffness of the pipe.
Due to the requirements of the sand filling process, the winding ring layer and the sand filling layer in the hollow floor slab are generally produced simultaneously. Among them, the annular winding also plays a role in attracting resin sand casting during the production process.
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