What are the functions of expansion joints and water stop strips? ? What is the impact and relationship between the size of the pool designed for our processes and the size of the factory building? ?

A building expansion joint is a structural gap created at appropriate locations along the construction joints of buildings or structures, in order to prevent structural cracks or damage resulting from changes in climate temperature (thermal expansion and contraction). A expansion joint divides the building components above the foundation, such as walls, floor slabs, and roofs (except wooden roofs), into two separate sections, allowing the building or structure to expand and contract horizontally along its length. Its main function is to prevent cracks from forming in structural elements. If a building is too long in plan, thermal expansion and contraction can lead to excessive temperature stresses within the structure; therefore, gaps need to be created at certain intervals along the structure to divide it into several sections, and these gaps are known as temperature joints. For different structural systems, the distance between expansion joints varies; Article 8.1 of China’s current code, the \"Code for Design of Concrete Structures\" GB50010-2010, provides specific regulations on this matter. Typically, during design, the integration of expansion joints, seismic joints, and settlement joints is considered. Water stop strips are classified by purpose as follows: water stop strips for deformation joints (B), water stop strips for construction joints (S), and water stop strips for joints with special aging resistance requirements (J). Note: Water stop strips with steel edges (G, such as BG, SG, JG) serve primarily to alter the path of water penetration and extend its route. The concrete for the bottom slab of the pool and its walls is usually poured separately; when the concrete for the walls is poured next time, a construction joint is created. If this joint is located below the water table, leakage can occur easily. Therefore, technical treatment is required for this seam, and there are many methods for doing so; one of the more common approaches is to use water-stop steel plates. That is, when pouring the lower layer of concrete, a 300*3 steel plate is embedded, with 10-15 cm of its upper part exposed. During the next concrete pouring, this portion of the steel plate is poured in together with the concrete, thereby preventing external pressurized water from seeping in. Water stop strips are part of the construction measures; they can be indicated in the design drawings or not. The plan dimensions of the factory building and the tank should, as much as possible, not exceed the specified requirements; if they do, gaps need to be created, which makes construction quite troublesome.