What is the deformation joint of exterior wall and

2022-07-22
  • Detail

The deformation joint of the external wall is one of the deformation joint devices, which is based on the use part of the external wall. In order to prevent cracks on the outer wall of the building from causing damage due to temperature changes, uneven settlement of wall materials, earthquakes and other factors, the design breaks the wall of the building at the deformation sensitive part of the outer wall in advance. The reserved outer wall gap can ensure that there is enough deformation space on the outer wall of the building. This kind of outer wall structural joint is called the outer wall deformation joint

the deformation joint of the external wall is one of the deformation joint devices, which is based on the use part of the external wall. In order to prevent cracks on the outer wall of the building from causing damage due to temperature changes, uneven settlement of wall materials, earthquakes and other factors, the design breaks the wall of the building at the deformation sensitive part of the outer wall in advance. The reserved outer wall gap can ensure that there is enough deformation space on the outer wall of the building. This kind of outer wall structural joint is called the outer wall deformation joint

I. overview of external wall deformation joint

external wall deformation joint refers to that in order to prevent cracks or damage to the building due to temperature changes, uneven foundation settlement, earthquakes and other factors, the building is disconnected in advance at the deformation sensitive part in the design, and divided into several relatively independent units, and the reserved gap can ensure that the building has enough deformation space. This kind of structural joint is called deformation joint

II. Classification of external wall deformation joints:

buildings often deform under the action of external factors, resulting in cracking and even destruction. Deformation joints are structural joints reserved for this situation. Deformation joints can be divided into expansion joints, settlement joints and seismic joints

expansion joints: building components will expand and shrink due to changes in temperature, humidity and other factors. For this reason, vertical gaps are usually set at appropriate parts of the building to disconnect the wall, floor, roof and other components of the building from above the foundation, and separate the building into several independent parts. The joint set to overcome the excessive temperature difference can be continuously disconnected from the foundation top to the roof extension structure

anti seismic joint: in order to make the building more regular and conducive to the anti-seismic of the structure, the foundation can be continuously opened. Its setting purpose is to separate large buildings into smaller parts to form relatively independent earthquake proof units, so as to avoid the damage caused by the uncoordinated vibration of the whole building caused by the earthquake. In the seismic fortification area, settlement joints and expansion joints must meet the requirements of seismic joints

settlement joint: refers to the building structural joint set to avoid cracking of the wall or other structural parts due to uneven settlement when the same building is highly different in height, the upper load distribution is uneven, or built on different foundation soils. The settlement joint divides the building into several sections, forming a system, which is not connected from the foundation, wall, floor to the roof. The seam width is generally 30 ~ 70mm. A vertical joint that completely separates a building or structure into sections from the foundation to the top. So as to avoid cracks caused by uneven subsidence of each section. It is usually set between the parts of the building with great differences in height, load or foundation bearing capacity, as well as at the connection of new and old buildings

many buildings have considered these three kinds of joints comprehensively, namely the so-called “ Three stitches and one &rdquo

three stitches one: the seam width is treated according to the anti-seismic seam width; The foundation is disconnected according to the settlement joint

construction joint: the joint formed by the planned interruption of construction due to the limitation of construction technology is called construction joint. Due to the layered pouring of concrete structure, the gap formed between this layer of concrete and the previous layer of concrete is the most common construction joint. Therefore, it is not a real seam, but a face

when the external environmental factors affect the building, the deformation joint may deform with the external action, resulting in cracking or even damage. Therefore, the deformation joint is equivalent to playing a buffer role. It is such a role that architects need to calculate the deformation joint. Then, what are the calculation methods of deformation joints? Next, let's go together by Xiaobian

in the final analysis, the calculation of deformation joint means how to set the deformation joint. In every architectural engineering design, the position and width of deformation joints are determined by professional structural designers

precautions for deformation joint calculation

1. The spacing of expansion joints of houses with integral structure should be taken according to the cast-in-place value in the table

2, the expansion joint spacing of frame shear wall or simple structure houses can take the value between the frame structure and the shear wall in the table according to the specific layout of the structure

3, when there is no heat preservation or insulation measures on the roof, the concrete shrinkage is large or the indoor structure is exposed for a long time due to construction, the spacing of expansion joints should be reduced according to the outdoor fence in the table

4, for structures located in dry climate areas, hot summer and frequent rainstorms, the spacing of expansion joints should be appropriately reduced

5, take the values in the table for the wall houses built with fired ordinary bricks, perforated bricks and reinforced blocks, and multiply the values in the table by 0.8 for the stone masonry, autoclaved lime sand bricks, autoclaved fly ash bricks and concrete block houses

6, the roof with tiles hanging on the reinforced concrete roof should be adopted as the reinforced concrete roof

7, the maximum spacing of expansion joints in the walls of houses and buildings that are not heated in areas with large temperature difference and frequent changes and severe cold areas should be appropriately reduced

there are often some wrong methods of external wall deformation joints at the construction site. The following points are incorrect methods of external wall deformation joint joints:

(1) both sides of the cover iron sheet of the settlement joint of the external wall are fixed, and the arc of the oblong hole is insufficient, which is confused with the joint method of the expansion joint. When the uneven settlement of the walls on both sides occurs, the vertical extension and contraction of the cover iron sheet is insufficient, so that the walls on both sides of the vertical joint are damaged, or the fixed steel nails are separated from the iron sheet, Form quality hazards

(2) the deformation joints of the external wall, especially the deformation joints dominated by uneven settlement, when two small corrugated aluminum alloy plates are used to overlap and cover the joints, the middle part of the overlap of the two plates is riveted with rivets, rather than the oblong vertical sliding hole, which cannot expand and contract freely, which is easy to cause the wall surface on both sides of the vertical joint to crack due to improper treatment, forming a quality hazard

(3) the expansion joint or anti-seismic joint of the external wall adopts arc-shaped stainless steel plate, but the camber is insufficient, which can not meet the expansion requirements of the wall caused by temperature changes or earthquake, resulting in quality hazards

(4) the decorative surface layer at the deformation joint of the water mixed wall is covered on the outer surface of the seam covering iron sheet, resulting in the weak adhesion of this part of the facing mortar and the formation of quality hazards

(5) the covering iron sheet is not fixed firmly, and it is directly fixed on the brick masonry with steel nails

precautions for the practice of external wall deformation joints:

the designer should indicate the model of external wall deformation joints in the design and construction drawings. If a series of models of the practice of external wall deformation joints are not indicated on the drawings, the construction party should take the initiative to ask the designer for a detailed node description, or communicate with the deformation joint manufacturer, and confirm the model of external wall deformation joints based on the atlas of external wall deformation joints to prevent blind construction, The hidden danger of deformation joint quality of exterior wall is left to the owner

editor's summary: the relevant information about what is external wall deformation joint and how to do it is introduced here. I hope this article is helpful to you. If there is anything else you don't understand, you can leave a message to Xiaobian below, and we will answer it for you as soon as possible

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