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The whole hanging basket is mainly composed of suspension mechanism (hanging beam or walking beam at the top of the building), suspension platform, lifting device (motor or manual hoist) and safety device (including brake, travel limit, safety lock, safety wire rope or manual sliding device). ) and electrical system (without manual hanging basket).
Hanging baskets for working at heights GB 19 155 General requirements for construction hanging baskets:
1 Normal working environment
(1) Ambient temperature: -20℃ ~+40℃
(2) the relative humidity of the environment is not more than 90%(25℃)
(3) The power supply voltage deviates from the rated value by 5%
(4) The gust wind speed in the workplace shall not be greater than 8.3m/s (equivalent to Grade 5 wind).
2 architectural design related requirements
(1) The bearing capacity of the building or structure shall be able to bear the full weight of the hanging basket.
(2) The design and construction of the building should facilitate the safe installation and use of the hanging basket and provide safe passage for the staff.
(3) The floor shall be provided with a safety anchor ring or embedded bolt for installing the hanging basket, with a diameter of not less than 16mm.
(4) In the proper position of the building, the hanging basket power socket should be set.
(5) Relevant information about hanging basket installation shall be provided to hanging basket users.
3 hanging basket requirements
(1) In the dynamic test, the hanging basket should have the capacity of overloading 25% of the rated load.
(2) During static test, the hanging basket should have the capacity of overloading 50% of the rated load.
(3) The rated speed of the hanging basket shall not be greater than 18m/min.
(4) The manual downhill device should be sensitive and reliable, and the descending speed should not be greater than 1.5 times the rated speed.
(5) When the hanging basket is subjected to static test load, the braking effect is 15 minutes, and the sliding distance should not be greater than 10 mm. ..
(6) When the window cleaner works under the rated load, the noise at the operator's ear should not be greater than 85dB(A) and the noise outside the machine should not be greater than 80dB(A).
(7) All kinds of safety devices set on the hanging basket cannot prevent emergency operation from getting out of danger.
(8) Effective anti-corrosion measures should be taken for all parts of the hanging basket.
4? Reliability requirements
(1) When the hanging basket bears the rated load, the hoist should work normally for 3000 cycles, the working time before the first failure should be not less than 0.5t0 (cumulative working time), the mean time between failure should be not less than 0.3 t0, and the reliability should be not less than 92%.
(2) When the manual lifting basket bears the rated load, the hoist should be able to work normally for 500 cycles. There should be no fracture and obvious wear. When the hoist changes its running direction, the brake should work.
5? Requirements of hanging basket platform
(1) The structure of the hanging basket platform should be able to bear twice the uniformly distributed rated load. Load test must be done before leaving the factory to check whether there are cracks in the weld and whether the bolts are loose.
(2) Quality inspection must be carried out on the welds of the main stress components of the hanging basket platform to ensure that the welds meet the design requirements.
(3) The bottom plate of the hanging basket platform must have anti-skid measures.
(4) The connection between the hanging basket platform and the lifting mechanism must be firm and reliable, without looseness, and should be checked frequently.
(5) The hanging basket platform shall be equipped with a hook device for safety belts and tools.
(6) The minimum channel width in the hanging basket platform is not less than 400mm, and the effective area of the bottom plate is not less than 0.25m2 per person.
(7) The hanging basket platform shall be provided with a fixed safety guardrail, the height of one side near the building shall not be less than 800mm, and the height of the rear side and both sides shall not be less than11000 mm. The guardrail shall be able to bear the concentrated load of 1000N moving horizontally.
(8) All parts of the safety guardrail of the hanging basket platform shall be smooth and free from burrs, and there shall be no defects such as skew, distortion and deformation after installation.
(9) Baffles with a height not less than 100~ 150mm should be installed around the bottom plate of the hanging basket platform, and the clearance between the baffle and the bottom plate should not be greater than 5 mm. ..
(10) The hanging basket platform shall be equipped with guide wheels sliding on the surface of the building or with buffer devices to ensure the stability of the hanging basket platform and avoid collision with the wall.
(1 1) When the hanging basket platform is equipped with a door, the door shall not be opened outwards, and the door shall be equipped with an electric interlocking device.
(12) The operating device for normal operation of the hanging basket platform should be installed on the hanging basket platform, and electrical equipment that can be inched and pressed continuously by hand and is not affected by climate should be selected.
6? Requirements for safety protection devices
Hanging baskets are generally equipped with brakes, travel limits and safety locks. , check before installation.
(1) brake
The basket brake must meet the requirements of 8.7, 8.7. 1, 8.7.2 and 8.7.3.
(2) Travel restriction
1. The hanging basket must be equipped with up and down limit switches to prevent the hanging basket platform from rising or falling to the end beyond the travel range.
2. The installation mode of the travel limit device must be that the hanging basket platform itself is in direct contact.
(3) Safety lock
1. A safety lock must be installed on the hanging basket, and a safety wire rope of the same model as that used on the lifting mechanism should be installed at the suspension of the hanging basket platform. Each safety wire rope must have a safety lock that cannot be automatically reset.
2. The safety lock shall enable the hanging basket platform to move when the sliding speed is greater than 25m/min, and stop within a distance not exceeding 100mm.
3. The action of the safety lock should be sensitive, the work should be reliable, and it should undergo strict inspection and test. Unqualified products are not allowed to be assembled from the factory. The safety lock must be used within the validity period and can only be used after passing the inspection by a professional factory.
(4) When necessary, there must be an anti-tilt device on the hanging basket.
(5) Overload protection device should be set on the hanging basket.