High load-bearing capacity of glass fiber reinforced steel, strong tensile strength

The characteristics of glass fiber bars:

①High load-bearing capacity, strong tensile strength, the strength of the rod body is twice that of the threaded steel bar of the same diameter, but the quality is only 1/4 of that of the steel bar;

②The elastic modulus is stable, about 1/3～2/5 of the steel bar;

③Electric and thermal insulation, thermal expansion coefficient is closer to cement than steel bars;

The performance of glass fiber bars is basically similar to that of steel bars. It has good adhesion to concrete, and at the same time has high tensile strength and low shear strength. It can be easily directly cut by a composite shield machine. Without causing abnormal tool damage. However, the difference between glass fiber reinforcement and steel reinforcement is that the elastic modulus of glass fiber reinforcement is small, which is a typical brittle material. The stress-strain curve shows an obvious linear relationship before breaking, which greatly affects the lifting performance of the glass fiber reinforcement cage. Stability and the flexural and shear bearing capacity of the glass fiber reinforced continuous wall during the excavation stage of the foundation pit.

① The glass fiber reinforcement and the steel bar are connected by lashing, and a sufficient lap length must be ensured in accordance with the relevant specifications to ensure the safety of the project.

②This construction method needs to be applied together with the main body of the shield well with the extension door when the shield is launched, and the effect is obvious.

③When the shield machine is configured with a soft-soil cutter head based on scrapers, it is not suitable to use the tool to directly cut the enclosure structure.

④ When using the mud water shield to directly cut the glass fiber tendons, it is necessary to flush the slurry pump in a timely and regular reverse cycle to prevent the excavated glass fiber tendon debris from floating on the mud and gathering at the slurry pump port to block the slurry pump.

⑤During the tunneling process, it is necessary to control the tunneling parameters: cutter head speed, cutter head torque, tool penetration, etc. to ensure tool safety.