Construction elevator connecting bolt installation way up or down, which is safer? Construction safety: in order to ensure the reliability of bolt connection of construction elevator and prevent safety accidents caused by nut loosening and falling off, Gaoli analyzes the potential safety hazards of bolt connection of construction elevator and puts forward suggestions for your reference
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The connection of each part of the construction elevator mainly uses high-strength bolts, because the quality and fastening degree of the connecting bolts have a very important impact on the overall safety performance of the construction elevator
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But at present, the installation of some construction elevators often ignores the bolt connection mode, which leads to the operation of construction elevators with diseases, and there are major safety risks
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Installation method of connecting bolt of construction elevator at present, the installation method of connecting bolt of standard section of construction elevator used in construction site has the following two situations: Method 1: installation from top to bottom (screw on top, fastening nut on bottom); method 2: installation from bottom to top (screw on bottom, fastening nut on top); comparison of advantages and disadvantages of two methods: problems found in inspection (1) ）The nut of connecting bolt is single nut, without double nut or single nut compression spring washer
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From the perspective of mechanical design, the tightening mode of bolt and nut is analyzed
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The connection bolt using double nut or single nut compression spring washer can ensure that the nut and bolt connection has enough preload, and the nut is not easy to loose and fall off when repeatedly stressed, while the single nut does not have the function of preventing the nut from loosening and falling off, which may cause the nut to fall off in the use condition, and the bolt will be damaged The failure of the connection leads to the collapse of the construction elevator
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（2） The connecting bolt is too short, and there is not enough thread length at the end of screw exposed nut
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If the connecting bolt is too short or does not extend out of the nut, the nut is easy to fall off under the repeated stress state of the bolt, causing accidents
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（3） The looseness of connecting bolts and nuts is prominent
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During the inspection, it is found that many connecting bolts can be screwed by hand, which does not meet the requirements of bolt preload
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Such a construction elevator in the working process by the bolt bearing shear force, coupled with the screw and screw hole angle steel repeated friction, the screw is very easy to appear without screw thread, once the screw thread damage will lead to the nut can not be fastened on the bolt, with the cage repeatedly up and down running, it is very easy to cause screw fatigue, resulting in construction elevator tipping safety accidents
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The above are some suggestions on the construction of elevator connecting bolts, I hope you can learn from the experience and lessons, remember to carefully check before the elevator operation
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Safety hazard analysis of the latest version of construction elevator in 2020 China building materials industry press price: 65 yuan discount price: 62 yuan date of publication: April 2020 construction elevator is an important vertical transportation lifting equipment in the construction of medium and high-rise buildings, which is usually used in the middle and later stages of construction, to undertake the transportation of construction personnel and materials, and to reduce labor intensity and improve safety High construction efficiency plays an important role
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In recent years, due to the relevant units do not pay attention to the idea, or do not understand the working principle of construction elevator, safety points and its important role in the construction, resulting in safety accidents from time to time
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Especially for the man cargo dual-purpose construction elevator, the accident often accompanied by greater casualties, which caused great damage to the personal safety of construction personnel and produced serious negative social impact
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In order to facilitate the property rights unit, installation and demolition unit, user unit, maintenance unit and testing unit and other relevant personnel to more intuitively understand, manage and use the construction site construction elevator, check the potential safety hazards of construction elevator, and put an end to accidents, we have inspected the construction site according to GB / t26557, gb10055, jgj305 and other relevant national and industrial standards, combined with inspectors This book is compiled based on the actual photos of the hidden dangers of aircraft landing
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The content of this book covers signs, foundations and fences, hanging cages, structures and connections, transmission systems, control and limit devices, etc
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in the form of pictures and texts, it intuitively explains the standard requirements and common safety hazards of construction elevators, and comprehensively reflects the safety hazards of construction elevators, which is conducive to improving the safety awareness of relevant personnel and reducing and preventing accidents To prevent construction elevator accidents
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This book can be used as a training material for construction elevator related personnel, and also as a reference manual for safety supervision and management personnel..
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