Main reasons for the falling of construction elevators
1. The safety management system is not perfect, and the safety responsibilities are not strictly enforced.
The specific performance is that the construction general contracting unit is managed by the contract, the project department is not equipped with professional management personnel, and no regular or irregular safety inspections are carried out; the rental unit does not check the safety status of the equipment; the installation unit does not pay attention to the lifting operation of the construction elevator. The operation is completed by non-professionals in the general contracting unit or the rental unit, or it is delivered to the application without experience after the increase of the operation. In addition, the engineering supervision does not have the professional knowledge of lifting equipment, so that the safety supervision work cannot be implemented.
2. When the equipment is installed, raised and disassembled, it does not work according to the requirements of the operating regulations and product manuals
The first is the equipment foundation. The construction unit does not pay enough attention to the equipment foundation. For example, the equipment is installed on a weak foundation without disposal, or it is installed on the ceiling of the basement without reinforcement under the regulations. The second is the installation of the rail frame. The verticality of the rail frame is not measured in two directions during installation, or the attached wall frame is not firmly attached. The rail frame connection bolts are not applied with the high-strength bolts specified in the manual. The distance between obstacles such as protective picks is less than 0.25 meters, which may cause interference. Finally, there is no on-site supervision of full-time personnel during installation, lifting and disassembly operations, no safety warning signs are hung during the operation, and they are put into application without completing the handover procedures after the operation is completed.
3. Inadequate safety management of safety guards
The first is the brake. The brake is prone to failure. Maintenance should be enhanced to keep the automatic clearance adjustment mechanism clean. The second is the anti-falling safety device, which is not sent to the manufacturer or a qualified unit for verification in time; and if there are no property rights units that have no backup anti-falling safety device, they will be disassembled and sent for inspection before the validity of the verification expires, resulting in the possibility of Continue to use the equipment under the condition of anti-fall safety devices; some of the equipment did not do the anti-fall test every three months as required. The third is the failure of the upper limit device. The first is that the limit travel switch fails after frequent application. The second is that the limit stop on the rail frame is not installed in time or is not firmly installed. Third, if the limit stop is installed Too close to the top of the rail frame may also cause the danger of the ladder cage falling. In order to avoid the ladder cage from rushing to the top, some equipment has no rack on the top standard section, and the effect is better. The fourth is the limit switch, which is used when the limit stop on the rail frame is not installed in time and the switch lever is not extended, and it cannot exert a safety protection effect. Finally, the electromechanical interlocking device of the ladder cage door may fail after frequent application. Some construction elevators are equipped with a mechanical door interlocking device, and the effect is better.
4. Irregular daily application management
Unlimited loading plates and operation rules in the cage; some construction elevator drivers did not perform the test drive according to the regulations before the operation and did not perform the handover procedures correctly; some drivers used the upper and lower limit devices to level the floor; some construction sites may have non-drivers Personnel operate the equipment without permission; check the working clearance and wear status of the drive gear and the rack rack of the rack on time; check the lubricant condition of the reducer of the drive unit on time;
Construction waste is thrown randomly during floor cleaning. Construction waste may be caught between the rack of the guide rail and the driving wheel of the upward ladder cage; some construction elevators are not equipped with floor contact signal devices as required; some entrance platforms have no floor signs Or the logo is unclear.