Rubber waterstop has good elasticity, abrasion resistance, aging resistance and tear resistance, and has strong adaptability to deformation. It can effectively prevent the seepage and leakage of construction joints. It is currently common in the waterproof and anti-seepage of tunnel construction joints. use. In construction, due to the different structural dimensions and forms such as the length of the lining, and the rubber waterstop has a certain length specification, it is inevitable that the waterstop joint will occur when used on site.
In the past, the joints of waterstops usually adopt the cold bonding method. The traditional cold bonding method is to flatten the rubber stems at the two joints of the rubber waterstop, and then perform a roughening treatment. After finishing, apply a layer of adhesive. In order to enhance the effect, wait for it. After drying, apply another layer, then place the two joints in a predetermined position for gluing, and pressurize, and finally pour the concrete. From past experience, the effect of cold bonding method is not ideal. The joints often have poor durability, poor plasticity, low strength, short service life, frequent cracks and even water seepage at the later lining construction joints.
Combining the actual construction of the Chengdu-Guizhou Railway and the documents required by the Cheng-Gui Railway Company to overcome the common defects in the construction quality of the waterstop, this bid section uses a hot vulcanization welder to weld the waterstop joints, and has undergone many process tests in the Manaoshan Tunnel in the early stage. Continuous attempts and improvements have been made to the welding joint treatment, heating temperature, heating time and other process parameters, and a set of mature rubber waterstop thermal vulcanization welding construction technology has been summarized.
