In order to prevent the building damage caused by uneven settlement of various parts of the building, the vertical joints set up are called settlement joints.
The width of the settlement joint is related to the nature of the foundation and the height of the building. The structure of the settlement joint is basically the same as that of an expansion joint, but the method of covering joints must ensure that two adjacent independent units can settle freely. In the brick-concrete structure, the foundation of the buildings on both sides of the settlement joint usually adopts two schemes: ①The foundation of the foundation of the wall on one side of the settlement joint is set up normally, and the longitudinal wall on the other side is borne by the cantilever beam , The beam end is additionally equipped with foundation beams and lightweight partition walls. ②The double wall scheme is adopted, that is, load-bearing walls are installed on both sides of the settlement joint to ensure that each independent unit has a closed connection with vertical and horizontal walls, and the structural integrity is good. When the distance between the two load-bearing walls is small, in order to overcome the eccentric force of the foundation, two rows of independent foundations staggered in the plane layout can be used, and the foundation beams of the bearing wall can be placed on top. The settlement joint also functions as an expansion joint. In the same building, the two can be combined, but the expansion joint cannot replace the settlement joint. The settlement joints in reinforced concrete frame structures usually adopt double-column cantilever beams or simply supported beams.
(1) The turning point of the building plan
(2) Where the height and load of the building differ greatly
(3) Appropriate parts of excessively long buildings
(4) The compressibility of foundation soil is significantly different
(5) The junction of different building foundation types and phased construction of houses
If the types of the foundation supporting layers are basically the same and the foundation is plain concrete, I think the foundation can be unbroken. Because of the weak shear resistance of concrete, even if uneven settlement occurs, it will not have much impact on the buildings on both sides of the deformation joint.
The purpose of setting settlement joints in structures is to avoid the settlement joints of structures due to load or uneven foundation bearing capacity
Uneven subsidence occurs evenly, resulting in multiple irregular cracks, which damage the structure. After the settlement joints are set, the structure can be restricted to have regular and fixed cracks, and the settlement joints can be treated in advance; if there is uneven settlement, it will be restricted to the settlement joints, which is beneficial to the safety and stability of the structure And anti-seepage (to prevent the water flow in the pipe from seeping into the culvert base or roadbed, causing the soil to soak and soft