I. Product Introduction:
Glass fiber reinforced pipe is a newly developed pipeline product in the field of water supply and drainage. It can complete underground pipeline construction and installation without excavation of the ground. It can directly cross highways, railways, rivers, and ground buildings. Due to its excellent properties such as good corrosion resistance, light weight, smooth inner wall, high flow rate, and good adaptability to geological conditions, it has become a pipeline material for pipeline projects in large and medium-sized cities.
Section II: Product Features:
1. Lightweight (1/10th the weight of concrete pipes), with low foundation requirements, minimal requirements for lifting and pipe-laying equipment, and easy construction.
2. Due to reasons such as minimal settlement and low uplift, pipeline alignment correction is easy.
3. Smooth inner wall, high flow rate; under a fixed flow rate, a smaller pipe diameter can be used, which can reduce the overall engineering cost.
4. Smooth surface, low thrust, minimal soil cohesion affects glass fiber reinforced pipe, no pipe gripping or clogging issues, long single push length, low equipment requirements for pushing.
Section 3: Process Route:
Utilizing a 12-meter long fixed-length winding process for reinforced fiberglass-sand pipe, four 3-meter-long pipe sections are produced on each mold, with intermittent sand filling as per design layers. The pure fiberglass section at each end of the pipe sections, ranging from 300 to 800mm, is locally reinforced with glass fiber fabric. The pipe sections are milled and cut using special equipment, and after trimming to the specified shape and size, they can be removed in one go. The production efficiency fully meets the required project progress. The design and production process employ an integrated approach with pure fiberglass and fiberglass-sand composite reinforcement.
Section 4: Design Technology
Based on the specific application conditions of glass fiber reinforced plastic (FRP) sand-filled pipe in trenchless pipe jacking projects, determine design parameters such as pipe diameter, pipe material stiffness grade, soil parameters, design load (including internal pressure, vacuum, vertical static soil pressure on the pipe crown, live load from ground vehicles, and soil stacking load), etc. These parameters provide a theoretical basis for the structural calculations of the FRP sand-filled pipe.
V. Structural Calculation:
Based on the selected design conditions and parameters, the structural calculations for glass fiber reinforced plastic manholes are performed in accordance with the Chinese National Standard "Glass Fiber Reinforced Plastic Manholes" (GB/T 21492-2008), "Manhole Construction Technology," and computer nonlinear finite element numerical calculations. The structural calculations for pipe materials include calculations, analyses, and verifications of uplift strength, stiffness, deflection deformation, bending strength, stability analysis, seismic strength analysis, and more.
VI. Production Process:
1. Confirm and approve the design and production plan.
2. Lining manufacturing
3. Glass fiber hoop-wound and cross-wound inner structural layer
4. Special sand-blasting with intermittent sand-blasting cloth (the sand-blasting cloth is continuous at the pure fiberglass but stops at the sanding points).
5. Fabricate the pure fiberglass sections promptly after each layer of sand-infused layers.
6. Glass fiber hoop and cross-wound outer structural layer
7. Trim and cut to achieve uniform shapes and specified dimensions.
8. After demolding, the products are inspected and, upon passing, are fitted with steel sleeve rings before being shipped out.
Section 7: Connection Method:
The pipe sections are connected and positioned using embedded steel sleeve rings. During jacking, glass fiber reinforced resin mouth seals are applied, providing water-tightness upon the two pipes being joined. A platform is machined at both ends of the jacking pipe to ensure that the outer diameter of the steel sleeve ring matches the jacking pipe's outer diameter after the sleeve ring is fitted onto the pipe end. The steel sleeve ring serves as a positioning device and enhances the pipe's resistance to uneven settlement. The resin mouth seal ensures water-tightness when the two pipes are connected. A platform is machined at both ends of the jacking pipe to ensure that the outer diameter of the steel sleeve ring matches the jacking pipe's outer diameter after the sleeve ring is fitted onto the pipe end. The steel sleeve ring serves as a positioning device and enhances the pipe's resistance to uneven settlement.
Section 8: Applicable Locations:
● Water supply and tap water projects. ● Petroleum and chemical engineering. ● Construction projects. ● Sewage treatment projects. ● Power, metallurgy, and environmental protection engineering. In summary, fiberglass pipe can complete the construction and installation of underground pipelines without excavating the ground. It can directly cross highways, railways, rivers, and ground buildings. This is due to the excellent properties of fiberglass ducts, such as good corrosion resistance, light weight, smooth inner walls, high flow rate, and good adaptability to geological conditions.
