What does “one band with four seams” mean in engineering? !

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What does “one band with four seams” mean in engineering? ! Immerse yourself in reading in the novel reader. 1. Post-cast strip: A post-cast strip refers to a temporary strip-shaped gap that is left in a cast-in-place reinforced concrete structure only during the construction phase. Depending on the requirements of the project, this gap is maintained for a certain period of time before being filled with concrete to form a continuous, integral structure. 2. Construction joint: Due to construction techniques or organizational issues, it is not possible to pour the entire structure in one continuous process; construction is interrupted as planned. When the concrete poured later exceeds its setting time, a bond surface forms between it and the concrete poured earlier, and this bond surface is known as a construction joint. 3. A expansion joint, also known as a temperature joint, is a structural joint installed vertically at appropriate positions along the length of a building to prevent structural cracks or damage caused by changes in climate temperature (thermal expansion and contraction). A expansion joint divides the building elements above the foundation, such as walls, floors, and roofs (except wooden roofs), into two separate sections, allowing the building to expand and contract horizontally along its length. However, considering that the base part is less affected by temperature changes, there is no need to disconnect it. It differs from expansion joints in that it is structurally separated from the foundation to the roof. 4. Settlement joints: When a building is constructed on a foundation with significant variations in soil quality, or when there are large differences in height, load, and structural design between adjacent parts of the building, uneven settlement can occur, leading to misalignment and cracking in some of its weak areas. To this end, vertical gaps are created at appropriate locations to divide it into several units with better stiffness (i.e., integrity), allowing the adjacent units to settle freely; such gaps are known as settlement joints. It differs from expansion joints in that it is structurally separated from the foundation to the roof. 5. Seismic joints: In areas with seismic design intensities of 8 or 9, seismic joints should be installed when there is a height difference of more than 6 meters in the building’s facade, or when the building has different floors with large height differences between them, or when the structural stiffness of various parts of the building differs significantly. Like expansion joints, seismic joints divide the entire building into several independent units with simple shapes and uniform structural stiffness. Seismic joints are provided along the entire height of the building, with walls on both sides.