In modern building construction, construction elevators have been widely used due to their advantages of smooth transmission, fast lifting, simple structure and convenient use.
However, due to the negligence of construction companies on the safety of elevators, the unscientific use of construction elevators has caused the frequency of construction elevator safety accidents to increase, which has aroused public concern. Therefore, we must pay attention to and actively take preventive measures to improve and solve.
During the construction process, if the construction elevator is prone to problems due to installation and failure, especially if it fails during operation, it is likely to cause life-threatening.
So we first need to understand the reasons for the failure of the construction elevators.
Analysis of the causes of accidents in construction elevators
1. anti-fall safety device failure
The anti-falling safety device is an important safety protection component to ensure the smooth lifting of the construction elevator during the working process and prevent the cage from falling. The safety performance is closely related to the life safety of the occupant.
Therefore, when using the anti-fall safety device, it is first necessary to strictly check whether it has a qualified factory test certificate. Secondly, since the qualified inspection of the anti-falling safety device is only valid for one year, the anti-falling safety device must be sent for inspection in time during its use.
However, in actual use, most domestic construction companies are not too concerned about the inspection of the safety device until the safety accident occurs to realize the seriousness of the problem. Therefore, in order to truly prevent the occurrence of safety accidents in construction elevators, it is necessary to pay attention to and do a good job of testing and regular inspection of anti-fall safety devices.
2 .safety switch failure
The safety switch of the construction elevator includes a top door limit switch, a cage door limit switch, a limit position switch, a fence door limit switch, an upper and lower limit switch, a counterweight anti-break rope protection switch and the like. As long as the function of a safety switch fails, there is a potential safety hazard, which may lead to a risk accident or a safety accident.
3. attached wall frame and standard section connection failure
Generally speaking, the operation and construction environment of the construction project are relatively bad. If the installation personnel are not serious in their work attitude, the installation of the connecting bolts of the wall bracket and the standard section is omitted, or the installation is not tight, or the bolts are loose but not checked out. , will lead to a security incident.
4. Safety accidents caused by frequent operations
In the construction site, in order to meet the construction schedule requirements, the elevators are generally in a state of frequent operation. Such long-term uninterrupted use often causes the motor to heat up and eventually fail, resulting in a safety accident.
Therefore, the management staff and drivers of the lift must take into account the design of the interrupted operation of the motor, and should reasonably dispatch the use of the lift to maximize the role of the equipment while ensuring safety.
5. no floor to dock security door
It is necessary to set up the safety guard door on the floor. The relevant building construction regulations require that the height of the protective door must be greater than or equal to 1.8 meters, and an effective interlocking device must be provided.
However, from the current actual construction situation, many construction companies do not pay much attention to the installation and use of the protective doors on the elevator landing floor. The safety protection doors can be opened at will, resulting in frequent safety construction.
6. basic fence does not install interlocking device
In order to save construction costs, some construction enterprises did not install the interlocking devices strictly in accordance with the construction regulations under the basic fence of the elevator work. Therefore, during the operation, if there is a sudden person directly under the elevator cage, a serious stamping safety accident will occur if a little care is taken.
In addition, accidents beyond the free end height set by the elevator are also prone to accidents.