the sealing strip for shield segment is the main material used for sealing sealing of assembled tunnel segment in Western European countries. It is composed of single multi-pass EPDM or multi-pass EPDM and expanded rubber. the material in a specific range of joint opening, even if the joint opening has a change, the contact surface stress is almost unchanged, even when the joint is completely closed, there will not be too much stress at the end of the segment, it can fully maintain the contact surface stress. the multi-pass rubber sealing belt can reduce the compression stress, increase the segment joint opening amount, and is not easy to long-term compression caused by stress relaxation and deformation. and the expansion rubber compound gasket is on this basis with the "double insurance", if three epDM gasket leakage, slow expansion rubber strip in water will begin to slowly expand, to water stop water, play the role of two waterproof.

Precautions for construction of rubber water stop belt in subway tunnel

1, the water stop belt in the construction process, because there are many sharp stones and sharp steel bars in the concrete, so when pouring and positioning the rubber water stop belt, we should pay attention to the impact force of pouring and ramming, so as not to puncture the rubber water stop belt because of too much strength. If it is found that there is a rupture phenomenon should be repaired in time, otherwise, when the joint deformation and water pressure, the ability of the rubber sealing belt to resist external force will be greatly reduced.

2, in the position of the rubber water stop belt, we must keep it flat at the interface, but not let the rubber water stop roll, kink, such as found that the phenomenon of torsion should be adjusted in time.

3. When casting and fixing the rubber water stop belt, the rubber water stop belt should be prevented from deviation.

4. When the rubber water stop belt is transported, it should avoid direct sunlight, do not contact with heat source, oil and harmful solvent. Finished products should be taken straight and flat, do not increase pressure. Storage place to maintain -10-+30, relative humidity 40%-80%.