Water stop steel plate
Definition of water-stop steel plate: horizontal members and vertical members of building basement cannot be poured at one time. Under normal circumstances, horizontal construction joints shall be left at a distance of 300mm from the foundation slab, and water-stop steel plates shall be placed at the construction joints. Generally, the steel plate of water stop is 400mm wide, and the new and old concrete are embedded in half. The specifications and models of steel plate water stop mainly include 200 * 2mm 200 * 3mm 300 * 2mm 300 * 3mm 350 * 2mm 350 * 3mm 400 * 4mm 450 * 4mm and so on.
The joint between new and old concrete is called construction joint, which belongs to the weak link of waterproof concrete. After adding the water-stop steel plate, water can't penetrate into the water-stop steel plate when it permeates along the gap between new and old concrete, which plays a role in cutting off the seepage path. Even if it permeates along the gap between the water-stop steel plate and concrete, the water-stop steel plate has a certain width, which also prolongs the infiltration path of water and can also play a waterproof role.
The "opening" of the water-stop steel plate faces the front, and the steel plate is closely combined with concrete. The splayed steel plate makes it difficult for groundwater to penetrate from the steel plate along the construction joint. The connection part of steel plate water stop requires full welding, and the effect is of course very good.
According to the appearance, it can be divided into CB-type waterstop (which refers to the embedded waterstop with a hole in the middle), CP-type waterstop (which refers to the embedded waterstop without a hole in the middle), EP-type waterstop (also known as the externally attached waterstop or the back attached waterstop, which refers to the externally attached waterstop with a hole in the middle) and EB-type waterstop (also known as the externally attached waterstop or the back attached waterstop). Commonly used specifications of rubber water stop are 300x6300x8300x10350x8400x10mm, etc. The commonly used model is buried 65 1.
1, water stop principle:
Make and install water stops to prevent water from penetrating, with widths ranging from 200 to 350. According to the design choice, the seepage diameter is appropriately enlarged. In the process of concrete pouring, it is partially or completely embedded in concrete, which has certain strength and toughness, and is between the water stop and the water stop steel plate.
Advantages: the waterproof material has good elasticity, wear resistance, aging resistance, tear resistance, strong deformation adaptability and good waterproof performance, and the temperature range is -45℃~+60℃. The cost is much higher and the construction speed is slower. According to the specification, the wall thickness of shear wall with water-stop steel plate should not be less than 250mm, and the clear distance between water-stop steel plate and steel bar is: wall thickness /2- outer protective layer thickness 50- wall two-way steel bar diameter; When the thickness of the wall is 250, 250/2-50-30 = 45 mm. The distance between the water-stop steel plate and the wall is too small, so it is easy to cause concrete vibration leakage during construction, and honeycomb holes are formed in this part. Therefore, when using steel plates, vibration must be strengthened at construction joints.
3. The weak links of water stop measures are the overlapping part and the 90-degree corner part. It is very difficult to control the 90-degree fillet weld of steel plate, and it is easy to form water leakage points. The welding construction at the corner of steel plate should be controlled as the key link of this process.
4. Scope of application:
Suitable for buildings with groundwater, such as pools and other buildings with water, buried in horizontal and vertical construction joints below the groundwater level.
5 construction technology:
Process description: Before waterproof construction of post-pouring belt of basement exterior wall, the inner coil protective layer should be constructed first. When laying the external wall coil, first lay the waterproof strengthening layer on the outer side of the precast slab, and then lay the large-area coil directly above the cover plate. When binding the wall reinforcement, fix the water-stop steel plate in the middle of the wall with additional reinforcement, first make an additional layer of waterproofing membrane at the post-cast strip of the bottom plate, and then make waterproofing membrane on the bedding face. When binding floor reinforcement, rubber water-stop and steel water-stop should be located at the bottom and middle of floor post-pouring zone respectively, and additional reinforcement should be added. Generally, the thickness of water-stop steel plate is 3mm, the width is >: 200mm, and the length is generally processed to be 3 meters long or 6 meters long, generally 3 meters, which is convenient for transportation. Click here to download the construction technical data for free. Try to ensure that the water stop steel plate is on the center line of the wall during construction; The welding between two steel plates shall be fully welded on both sides, and the overlap of steel plates shall not be less than 200mm. The external cause of the corner of the wall is usually T-welding, 7-shaped welding, etc. The support welding of water-stop steel plate can be welded on the main reinforcement with small steel bars; When the water-stop steel plate passes through the column stirrup, the stirrup can be disconnected, made into an open hoop and welded on the steel plate.