Setting requirements for operation platform and brake reset emergency stop of construction hoist: 1.
The construction elevator shall comply with the current national standards safety code for construction elevator gb10055 and safety technical code for installation, use and disassembly of construction elevator jgj215.
(3) After the limit switch acts, only professionals can restore the movement of the cage; (4) Limit switch and travel switch shall not share one trigger element; (5) Limit switches shall be directly triggered by the movement of the cage or its related parts.
2.
Safety limit device ★ The construction elevator shall be equipped with upper and lower limit switches, which are sensitive and reliable.
When a single steel wire rope is excessively elongated or damaged, the electrical safety device shall stop the operation of the elevator.
Setting requirements: 1.
The construction elevator shall be equipped with overload detection device.
② Lower limit switch: under normal working conditions, the lower limit switch acts first before the cage touches the buffer.
At that time, the workers of a Construction Co., Ltd.
on October 26, 2021, a falling accident occurred in Taoyuan Yaju phase II project in Jiangyan District, Taizhou City, killing two people.
At present, the specific cause of the accident is still under further investigation.
The shutdown device (emergency stop switch) shall be of non automatic reset type.
5.
The construction elevator shall be equipped with safety devices to prevent the cage from falling.
Never think that the attached wall can maintain balance and ignore the bolt inspection of the guide rail frame! The standardization of construction elevator includes: safety device, limit device, protective facilities, wall frame, steel wire rope, pulley and counterweight, installation, disassembly and acceptance, guide rail frame, foundation, electrical safety and communication device.
4.
3.
Fall arrest safety devices shall function at all times, including installation, disassembly and before resetting after action.
There shall be no device for the user to cancel the warning signal.
A limit switch shall be set at the top and bottom of the stroke, which can be connected with other mechanical stop devices (such as buffer) in the cage Cut off the power supply before contact to stop the cage.
(6) It is forbidden to use the travel limit switch as the control switch to stop operation.
The installation position of the upper limit switch shall comply with: ① when the lifting speed is less than 0.8m/s, the upper safety distance L left after the lifting cage triggers the upper limit switch shall not be less than 1.8m; ② When the lifting speed is greater than 0.8m/s, after the upper limit switch is triggered by the cage, the minimum safety distance L at the upper part shall meet: l = 1.8 + 0.1v2, where: l: upper safety distance; 5: Lifting speed, M / s.
The anti falling safety device shall be used within the effective calibration period, and the action shall be effective and reliable.
The single cage shall not stay on the upper part of the attached wall! There are too many bloody lessons.
When two workers stood above the hanging cage on the west side (without wearing safety belts) to dismantle the first attached wall from top to bottom on the 17th floor, the guide rail frame suddenly overturned, resulting in two workers falling from high places and being rushed to Taizhou Second People’s Hospital for rescue.
★ The construction elevator must be equipped with cage and reusable buffer, which shall meet the specification requirements.
The anti falling safety device shall be forcibly scrapped five years after leaving the factory.
When the cage with rated load acts on the buffer at a speed greater than the rated speed of 0.2m/s, the average deceleration of the cage shall not be greater than 1G, and the time when the peak deceleration is greater than 2.5G shall not be large At 0.04s; 3.
2.
★ The counterweight steel wire rope shall be equipped with anti loose rope device, which shall be sensitive and reliable.
3.
The action of the hydraulic buffer shall be monitored by the electrical safety switch.
At this time, the contact plate shall have a certain stroke from the trigger lower limit switch.
When the hydraulic buffer is used, the method of checking the oil level shall be provided.
The foundation and foundation of construction elevator shall meet the requirements of the operation manual.
When the hydraulic buffer is compressed, the lifting cage cannot be started through normal operation.
2.
After the limit switch acts, only professionals can resume the movement of the cage.
2.
in Jiangsu were carrying out the demolition of the construction elevator of the 18# building.
2.
It is reported that at about 1250 a.m.
① Installation position of upper limit switch: under normal working condition, the over travel distance between upper limit switch and upper limit switch is 0.15m for SC construction elevator and 0.5m for SS construction elevator (people and goods).
Recently, Taizhou housing and Urban Rural Development Bureau of Jiangsu Province reported a high-altitude falling accident that killed two people.
★ The construction elevator shall be equipped with an upper limit switch, which shall be sensitive and reliable.
Drainage facilities shall be set around the foundation of construction elevator.
Before each shift, the safety device of the construction elevator shall be inspected to ensure sensitivity and reliability.
(2) Non automatic reset upper and lower limit switches shall be set at the top and bottom of the stroke, which shall be able to cut off the power supply before the cage contacts with other mechanical stop devices (such as buffer) to stop the cage.
★ The construction elevator shall be equipped with emergency stop switch and meet the specification requirements.
Setting requirements: 1.
The buffer shall be installed at the lowest part of the cage and counterweight operation channel.
The limit switch shall be directly triggered by the movement of the cage or its related parts.
When the construction elevator foundation is set on the basement roof, floor or other lower suspended structures, the bearing capacity of the foundation support structure shall be checked.
2、 Safety device 1.
The anti falling safety device shall have a test certificate (or test report) and the valid label shall not exceed 1 year.
Setting requirements: 1.
The shutdown device (emergency stop switch) shall be set outside: a) ground protective fence; b) Pulley room (if any).
After preliminary investigation, at about 12:50 noon on October 26, 2021, a falling accident occurred in Taoyuan Yaju phase II 18# building, Jiangyan district.
Setting requirements: 1.
The steel wire rope construction elevator and the reused steel wire rope shall be equipped with an anti loose rope device.
5.
Safety reminder: the bolts of guide rail frame of construction elevator must be tightened! Please remember! When exceeding the height of the attached wall, the two cages must go up and down synchronously.
At that time, The accident resulted in one death and one injury (the injured Zhu died after rescue).
The construction elevator shall be equipped with travel limit switches, which are specified as follows: (1) the construction elevator shall be equipped with automatic reset upper and lower limit switches, but the triggering of up travel switch shall not be used as the normal operation of stopping at the highest level station.
The device shall have a rope loose switch that meets the requirements, and shall be able to interrupt any movement of the cage until it is operated by professionals.
Pulley room refers to the room where only pulleys or speed governor and electrical equipment are installed; c) cage top, if the cage top is accessible; d) in the installation / disassembly / maintenance / inspection control device; E) in the cage.
Within 5m of the horizontal distance around the foundation of the construction elevator, no wells or ditches shall be excavated, and no inflammables, explosives and other sundries shall be stacked.
foundation 1.
When the load in the cage exceeds more than 10% of the rated load, the overload detection device will give a warning signal in the cage and prevent it from starting normally.
Before the installation of construction elevator, the foundation shall be accepted and can be installed only after it is qualified.
The installation position of the lower limit switch shall ensure that when the rated load of the cage decreases, the contact plate triggers the switch to stop the cage.
3.
The construction elevator shall be equipped with an up travel (limit) switch..
4.
The device shall have a rope loose switch that meets the requirements, and shall be able to interrupt any movement of the cage until it is operated by professionals.
The 9.12 accident in Wuhan, the 10.4 accident in Tianmen and the collapse accident in Hengshui, Hebei are all caused by the final tightening of the bolts of the guide rail frame.
③ Installation position of lower limit switch.
Standardization requirements for construction elevator I.
2.
The shutdown device (emergency stop switch) shall be able to stop the elevator (including power driven door) or keep it in non working state.
The steel wire rope elevator and the reused steel wire rope shall be equipped with an anti loose rope device.
