Composition and characteristics of deformation joint
Deformation joint device It is an industrial product integrating practicability and decoration. It is a building accessory for covering and decorating deformation joints of buildings. It is composed of aluminium alloy Profile, aluminum alloy plate (or stainless steel plate ）, rubber inserts and various special rubber strips. It protects deformation joints. If equipped with waterstop and fire stop belt, it can also meet the requirements of waterproof, fireproof, thermal insulation, etc. When used for roof and outdoor platform, stainless steel row can also be added water tank And drain the permeated water.
Definition of deformation joint
Settlement joint Expansion joints and seismic joints are collectively referred to as deformation joints. Generally, settlement joints, expansion joints and seismic joints are used to divide the house into several separate parts, so as to eliminate the damage to the structure caused by differential settlement, temperature and shrinkage stress and complex shape.
2. Settlement joint
The settlement joint is to disconnect the whole structure of the different parts from the top to the foundation, so that each part can settle freely, so as to avoid the damage to the structure caused by the additional stress caused by the settlement difference. Settlement joints should be considered under the following circumstances:
⑴ The height of the main structure of the building is very different, and the weight difference is too large;
(2) Uneven foundation;
⑶ Different units of the same building structure adopt different foundation forms;
⑷ The superstructure adopts different structural forms or the junction of structural systems.
3. Expansion joint
The expansion joint, namely the temperature joint, is set to release the internal force caused by temperature change and concrete shrinkage in the structure when the plane size of the building is large.
The method of setting expansion joints is usually to set double walls or columns at the expansion joints to disconnect the superstructure and divide it into separate structural units. For buildings with seismic fortification requirements, the width of expansion joint shall meet the requirements of the width of seismic joint
Large spacing of expansion joints
structural system
| Construction method | Large spacing (m) |
frame | Cast in situ | fifty-five |
Shear wall | Cast in situ | forty-five |
4. Shockproof joint
In order to avoid earthquake damage, seismic joints can be set to divide high-rise buildings with complex plane and shape into several regular, neat and uniform individual structural units. Seismic joints should be set in the following cases:
⑴ When the protruding part of the building plane is long and no effective measures are taken;
⑵ The house has large staggered floors;
⑶ When the structural stiffness or load of each part of the house is significantly different;
⑷ When the foundation is uneven and the settlement difference of each part is too large
5. The current "Technical Specification for Concrete Structures of High rise Buildings" refers to the small seismic joint of reinforced concrete structures
Provisions on leniency:
(1) In no case shall it be less than 70mm;
(2) The building height of frame structure shall not exceed 15m, and 70mm can be used; For the part exceeding 15m, 6, 7, 8 and 9 degrees should be widened by 20mm for every 5m, 4m, 3m and 2m of increased height;
(3) The smaller joint width of the seismic joint of the frame shear wall structure shall be 70% of that specified in the preceding article (2); The smaller joint width of the seismic joint of the shear wall structure shall be 50% of that specified in the preceding Article (2), but shall not be less than 70mm.
