Product Introduction:

Glass fiber reinforced plastic pipe is a newly developed pipeline product in the field of water supply and drainage. It can complete underground pipeline construction and installation without excavating the ground. It can directly cross roads, railways, rivers, and ground buildings. Due to its excellent properties such as 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), low foundation requirements, minimal demands on lifting and pipe-laying equipment, easy to install.

2. Due to reasons such as low 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 construction cost.

4. Smooth surface, low thrust, minimal soil cohesion affects the 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 wrapping process for reinforced glass fiber composite sand-filled pipes, four 3-meter-long sections of glass fiber composite culverts are produced on each mold in accordance with the design layering, with intermittent sand filling. The pure glass fiber composite sections of 300 to 800mm at each end of the culverts are locally reinforced with glass fiber fabrics. The sections are ground and cut using specialized equipment, and once the specified shape and size are achieved, they can be demolded in one go. The production efficiency fully meets the project progress requirements. The design and production process employ an integrated approach of pure glass fiber composite and glass fiber composite sand-filled composite reinforcement.

IV. Design Technology:

Based on the specific application conditions of the glass-fiber reinforced plastic (GRP) sand-filled pipe in the pipe jacking project, determine design parameters such as pipe diameter, material stiffness grade, soil parameters, and design loads (including internal pressure, negative pressure, vertical static soil load on the pipe crown, live load from ground vehicles, and soil heap load) to provide a theoretical basis for the structural calculation of the GRP 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 China's national standard "Glass Fiber Reinforced Plastic Manholes" (GB/T 21492-2008), "Manhole Construction Technology," and computer nonlinear finite element numerical calculations. The structural calculations of the pipe material include calculations, analyses, and checks for uplift strength, stiffness, deflection deformation, bending strength, stability analysis, seismic strength analysis, and more.

Section 6: Production Process

1. Confirm and approve the design and production plan.

2. Lining manufacturing

3. Glass fiber hoop-wound and cross-wound internal structure layer

4. Special sandblasting with intermittent sandblasting cloth (the sandblasting cloth is continuous at the pure glass fiber but stops at the sandblasting section).

5. Promptly fabricate the pure fiberglass sections after each layer of sand sandwiching.

6. Glass fiber hoop-wound and cross-woven external structural layer;

7. Trim and cut to achieve uniform shapes and specified dimensions.

8. After demolding, the items are inspected and upon passing, they are mounted with steel sleeve rings and then shipped out.

Section 7: Connection Method:

The pipe sections are connected and positioned using embedded steel sleeve rings. During jacking, glass fiber reinforced resin sockets are used for sealing. After the two pipes are joined, they provide water sealing. 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 it is fitted onto the pipe end. The steel sleeve ring serves as a positioning device and enhances resistance to uneven settlement. The resin sockets provide sealing, and upon joining the two pipes, they ensure water tightness.

Section 8: Applicable Locations:

● Water supply and tap water engineering. ● Petroleum and chemical engineering. ● Construction engineering. ● Sewage engineering. ● Power, metallurgy, and environmental protection engineering. In summary, fiberglass pipe can complete underground pipeline construction and installation without excavation of the ground. It can directly cross highways, railways, rivers, and ground buildings. This is due to the excellent characteristics of fiberglass ducts, such as good corrosion resistance, light weight, smooth inner walls, high flow rate, and good adaptability to geological conditions.