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For underground concrete structures such as basements, water reservoirs, sewage treatment tanks, culverts, and utility tunnels, waterproofing is the top priority of the project. Concrete is poured in sections, which creates construction joints, and construction joints are high-risk locations for leakage. Once waterproofing fails, later-stage seepage plugging becomes extremely difficult and repair costs are very high. The waterstop steel plate is a widely used rigid waterstop embedded building material. It relies on its bent structure to extend the seepage path and block groundwater from penetrating along construction joints, making it an indispensable material in underground waterproofing systems. Recently, underground waterproofing projects have started construction in clusters, and our company maintains ample stock of waterstop steel plates, supports custom processing, and offers one-stop supply to meet the rigid waterstop construction needs of various underground projects.
Waterstop steel plates are conventionally made from Q235 hot-rolled steel plates. After forming, most have a V-shaped or U-shaped structure with a bend in the middle, also called folded-edge waterstop steel plates. The construction principle is that before concrete pouring, the waterstop steel plate is embedded in the middle of the construction joint, with half of the steel plate embedded in the previously poured concrete and half in the later-poured concrete. For groundwater to pass through the construction joint, it cannot penetrate in a straight line directly; it must detour along the bent surface of the steel plate, greatly lengthening the seepage path. The steel plate itself acts as a water barrier, blocking the seepage channel and achieving the waterstop effect. It is a permanent rigid waterproofing component and, together with rubber waterstop strips and waterstop screws, forms a complete underground waterproofing system.
Waterstop steel plates come in a wide range of specifications. Common widths on the market include 300mm and 400mm, with thicknesses from 2.0mm, 2.5mm, 3.0mm, etc. Different project waterproofing grades and water pressure levels require different specifications. For water tanks and basement floor and exterior walls with high water levels and Grade 1 waterproofing, thicker and wider waterstop steel plates are preferred; conventional specifications can be used for ordinary ancillary structures. Our company supports custom widths and thicknesses according to drawings, and can also cut lengths and pre-form products as needed to reduce on-site processing work at the construction site. On-site cutting easily leads to uneven cut edges and bending deformation, and can also delay the construction schedule.
In the production and processing stage, the steel plate raw materials are inspected for material quality upon arrival, and the plate surface must be flat without warping or rust pits. The bending process uses dedicated bending equipment to ensure the folded edge is centered and symmetrical with a uniform bending angle, avoiding the situation where one side is wide and the other narrow. The lap welding of waterstop steel plates is key to on-site construction. We clearly specify lap requirements in the factory instructions: the lap length is generally not less than 5cm, and the lap position must be fully welded on both sides with continuous and dense welds, free of slag inclusions and pores. Weld defects will directly form seepage channels. In many cases, later leakage at construction sites is not due to the quality of the steel plate itself, but due to inadequate lap welding. The plate surface generally does not receive additional painting because the steel plate is embedded inside concrete, and after being wrapped by concrete and isolated from oxygen, it is not prone to rusting. If in a long-term exposed environment, anti-corrosion treatment can also be applied as needed.
Storage and transportation of waterstop steel plates also require attention. The steel plates are thin and light, and stacking them too high can easily cause bending deformation. Deformed waterstop steel plates fit poorly after embedding, greatly reducing the waterstop effect. Our warehouse stores them flat in zones with wooden supports, and loading is properly protected to avoid impact and bending during transportation. When shipping, construction guidance documents are included, explaining the embedding direction, fixing method, and key points of lap welding of waterstop steel plates, and reminding construction personnel that the folded edge should face the water-facing side. This detail is easily reversed by many construction workers, which directly reduces the waterstop effect.
Leakage treatment in underground projects has always been an industry challenge, and prevention is far better than later-stage plugging. As the first line of defense for rigid waterstop at construction joints, the waterstop steel plate's quality and embedding process are equally important. Our company continuously stocks conventional specifications of waterstop steel plates and also accepts custom-shaped processing orders, providing stable supply and reliable waterstop supporting building materials for waterproofing projects such as basements, water tanks, utility tunnels, and culverts, helping projects reduce leakage risks from the source and ensuring long-term waterproofing stability of underground structures.
