There is a lot of knowledge about the setting of external scaffold wall connecting parts
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Today, we only discuss the layout requirements of wall connecting parts: article 6.4.3 in jgj130-2011: in the above article about the layout position of wall connecting parts: whether the wall connecting parts are connected with the vertical pole? Is it connected with inner and outer vertical poles at the same time? Did not say very clearly! This also makes it difficult for the on-site management personnel to “enforce the law”, because the workers are always “how to be simple and how to come” after working a lot of time! On this point, in article 6.10 of jgj130-2011 code, there is a figure as follows: from the diagram above, it can be seen that the wall connecting parts are connected with the vertical pole and connected with the internal and external vertical poles at the same time, so the doubt comes
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Let’s not discuss the supporting strength of this figure, then the cantilever frame is so, is the floor frame required the same, and what is the basis? PS: about the steel cantilever scaffold, many small partners are not very clear about the starting position of the steel anchorage and cantilever length of 1.25 times, take a good look at the above figure! Explanation: in article 6.4.3 “explanation of provisions” of jgj130-2011, please note that it is explanation of provisions
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Many small partners can’t even read the text of the specification, let alone the provisions! 1
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The maximum distance from the main joint to the wall is limited to 300 mm, which refers to the British standard
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Only the wall connecting parts near the main node can effectively prevent the scaffold from transverse bending instability or overturning
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If the wall connecting parts are set far away from the main node, due to the poor bending stiffness of the upright pole, the local bending of the upright pole will weaken or even fail to restrain the transverse deformation of the scaffold
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In the investigation, it is found that many wall connecting parts are set near 1 / 2 of the pole step, which is extremely unfavorable to the stability of the scaffold
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It must be corrected
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Extension: it can be seen that the main function of the wall connecting parts is to prevent the scaffold from transverse bending instability or overturning, and the bending deformation of the vertical pole is the main reason for this hidden danger
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Therefore, the wall connecting parts must be connected with the vertical pole, and the internal and external vertical poles must be connected at the same time
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2
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As the first step column bears the largest axial force, it is the control rod to ensure the stability of the scaffold
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In this place, a wall connecting piece is set up, that is, a support is added, which is one of the important measures to ensure the local stability of the scaffold pole from the structure
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Extension: the above is the reason why the wall connecting parts should be set from the first longitudinal horizontal bar
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Source: engineer, carpenter.
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