Definition: Vertical joints are provided along the length of the building to prevent cracks or damage to the building due to temperature changes and thermal expansion and contraction. Such joints due to temperature changes are called expansion joints. Method: Starting from the top of the foundation, the walls, floor, and roof are all disconnected and divided into several sections. The distance between expansion joints is about 60m; width 20mm ~ 30 mm.
Definition: Vertical joints installed to prevent damage to a building caused by uneven settlement of the foundation in all parts of the building are called settlement joints. Method: Breaks from the bottom of the foundation and runs the full height of the building. The two sides are independent units that can settle freely vertically. Setting principle.
(1). Turning parts of the building plane.
(2). Large differences in building height and load.
(3). Appropriate parts of excessively long buildings
(4). Significant differences in the compressibility of foundation soils
(5). Junction of different types of building foundations and phased construction of houses
Definition: In areas where the intensity of earthquakes is ≥ 8 degrees, the vertical joints set up to prevent damage to buildings caused by earthquakes are called seismic joints.
Method: It is broken from the top surface of the foundation and runs through the whole height of the building, with a minimum gap size of 50-100 mm. The minimum gap size is 50 ~ 100 mm, and there should be walls on both sides of the joints to divide the building into a number of independent units of simple size and uniform structural rigidity. Setting principle.
(1). The difference in elevation of the house is more than 6m
(2). The house has wrong floors, and the difference in floor height is large
(3). The stiffness of the components is very different.
Provisions: When expansion joints or settlement joints need to be installed in buildings in earthquake-proofed areas, they shall be treated as seismic joints.