According to the material, the external water stop belt can be divided into rubber water stop belt and plastic water stop belt. According to the construction position, it can be divided into EP middle non-porous external water stop belt and EB middle porous external water stop belt. Rubber material is the main material in tunnel construction, but after the development of this industry in recent years, plastic external waterproof belt has been developed. Its advantage lies in using waterproof board as the same material as the waterproof board used in the same part of the project, because this can make waterproof board and waterproof belt welded together, and ensure that the waterproof board is hoisted and installed in the waterproof belt. Convenience and firmness. Back-mounted waterproofing belts are classified according to the location in concrete, also known as outer-mounted waterproofing belts, which are used for waterproofing concrete expansion joints. Back-mounted water-stop belt can be processed by raw materials, such as natural rubber back-mounted water-stop belt and EPDM back-mounted water-stop belt. According to the shape, it can be divided into EB type (back-mounted with orifice in the middle) and EP type (back-mounted without orifice in the middle). Back-mounted water stopper is widely used as an important type of rubber water stopper. The principle of water stopping is to seal the water by means of the tight occlusion between the rack protruding from the surface of the back-mounted water stopping belt and the construction concrete, and fix the grouting pipe at the inner root of the outer rack of the back-mounted water stopping wings. The grouting fluid is evenly filled in the gap between the rack of the water stopping belt and the concrete by the surface of the grouting pipe and the grouting hole. In order to seal water, cement slurry or chemical slurry can be used as grouting fluid. Back-mounted water-stop belt also acts as a waterproof enclosure in the tunnel.
Standard 1 for material and physical and mechanical properties of rubber water-stop belts. Elastic water-stop belts should be made of natural rubber, chloroprene rubber, styrene-butadiene rubber, butadiene-fine rubber, ethylene-propylene-diene rubber, rubber rubber, water-swelling rubber, plastic (PVC) or rubber-plastic materials. 2. The physical and mechanical properties of rubber waterproof belts conform to the national standards of GB18173.2-2000 and GB/T18173.3-2002. 3. The hygienic indexes of the water stop belts used for storing or transporting drinking water conform to the requirements of Hygienic Standards for Rubber Products for Food GB4806.1 or Hygienic Standards for Drinking Water for Life GB5749. 2. Type and fittings of rubber waterproof belt 1. CB type is embedded rubber waterproof belt with holes in the middle, which can be used for expansion joint, settlement joint and shock-proof joint; 2. CP type is embedded rubber waterproof belt without holes in the middle, which can be used for expansion joint and settlement joint and shock-proof joint with little deformation; 3. EB type is externally bonded rubber waterproof belt with holes in the middle, which is suitable. For hydraulic pressure and deformation joints with small deformation; 4, EP type is an outer-mounted rubber water stop with no holes in the middle, suitable for hydraulic pressure and deformation joints with small deformation; 5, rubber water stop with corresponding forms of accessories are: plane L-type, plane T-type, plane cross, elevation L-type, elevation T-type, elevation cross-type and so on. Thirdly, the application scope of rubber water stop belt is widely used in various types of concrete and cast-in-situ concrete structures. Such as: underground canals, dams, reservoirs, inverted siphons, subway, culverts, tunnels, railways, water plants, sewage treatment plants and other large-scale water conservancy projects. Sometimes these engineering types can not be poured continuously, or the thermal expansion and cold contraction of concrete components will be caused by the deformation of foundation and temperature change, so deformation joints and construction joints should be left during pouring. The problem of leakage prevention of these joints can be solved by using rubber waterproof belt. It can not only prevent groundwater (or external water) from leaking into the building structure, but also prevent water from leaking into the boundary of the building, and the use effect is good.