Shield entry and exit is an important part of the tunnel construction process. Before the shield enters and exits, it is necessary to deal with the reinforcement in the end shaft enclosure structure. The general treatment method is to use grouting or temporary enclosure piles. Reinforce the soil behind the well wall, and then manually excavate under the conditions of precipitation after the reinforcement. When the structure is destroyed during the excavation process, there will be phenomena such as soil exposure and difficult to control groundwater, which will lead to the collapse of the formation soil when the shield enters and exits the cave. When the pile is pushed out by the shield machine and the earth pressure behind the pile, the lateral displacement of the pile body becomes larger. If the soil type above the tunnel is poor, it is easy to cause the loosening of the soil body. The pile breaking time is relatively long. Once the unearthed volume is not well controlled, it is easy to cause collapse.
The shielding piles of the traditional shield end wells use a reinforced concrete structure. Although the safety and stability of the tunnel can be guaranteed, the entrance and exit wells of the shield cause a lot of trouble for the cutting of reinforced concrete. At present, the tunnel construction uses glass fiber reinforced concrete enclosing piles. The glass fiber reinforced concrete shows good mechanical properties and cutting performance in practical engineering applications, and has significant physical advantages. It can simplify the construction process while ensuring the safety and stability of tunnel construction. Process to reduce the risk of construction. Years of experimental certifications by relevant professionals have shown that fiberglass reinforcement enclosures are as reliable and safe as reinforced piles in practical applications, and the use of shield cutting of fiberglass reinforcement can shorten the hole-breaking time and thus shorten the construction period of the entire tunnel.
FRP fiber reinforced plastic product features high tensile strength: tensile strength is better than ordinary steel, higher than 20% of steel bars of the same specification, and good fatigue resistance.
Light weight: only 1/4 of the same volume of steel; density between 1.5-1.9 (g / cm3).
Strong corrosion resistance: Corrosion resistance of chemicals such as acid and alkali can resist the corrosion of chloride ions and low pH solutions, especially the corrosion resistance of carbon compounds and chlorine compounds is stronger.
Easy to cut and easy to construct: The cutter head can cut directly, and can produce various standard and non-standard parts with different cross-sections and lengths according to user requirements. On-site lashing can use non-metallic tensioning straps, which is easy to operate.
Strong concrete binding strength: The coefficient of thermal expansion is closer to cement than steel, so the binding strength with concrete is stronger.
Strong designability: stable elastic modulus. It is dimensionally stable under thermal stress, and can be arbitrarily thermoformed in bending and other shapes; it has good safety performance, does not conduct heat, does not conduct electricity, is flame-retardant and antistatic, and will not generate sparks when it collides with metals through formula changes.
Magnetic permeability is strong: This material is a non-magnetic material, and it is not required to be demagnetized in non-magnetic or electromagnetic concrete components.
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