The overall dimension of the hanging basket is 3.0×0.9× 1.5m, and the construction is divided into two stages, the first stage 17 to 6 floors is 33m high, and the second stage/6 to 1 floors is 24m high.
According to the basic calculation mode of GBJ68-84:
S≤R ( 1)
Types of load effect combination design values:
S= (2)
Structural importance coefficient: = 0.9; Load distribution coefficient: for dead load =1.2; Construction load: =1.4; The load effect combination coefficient only considers the construction load = 1.0, and when the wind load is not considered, the practical design expression is SD = 0.9 (1.2 sgk+1.4 sqk) ≤ r (3).
(1) load calculation:
Hanging basket weight: 750 N/m2× 3.0× 0.8 =1800 N.
Chain block and safety lock weight: (140+30)N/ root× 2 = 340n, weight of four φ 12.5 steel wires:
5.4N/m×4×50m = 1080n SGK = 3220n
Construction load: sqk =1500n/m2× 3.0× 0.8 = 3600n.
Calculation load of a group of hanging basket frames without considering wind load;
SD = 0.9( 1.2×3220+ 1.4×3600)= 8023.6n
(2) Checking calculation of safety factor of wire rope:
By n=S.a/W≥ 10 (4)
Breaking force of wire rope:
S=αPg=0.85×97300=82705N
Number of stressed steel wire ropes: a = 2；;
Dead load: w = sgk+sqk = 6820n；;
n = 82705×2/6820 = 24.25 & gt； [n]= 10 meets the requirements.
5. Key points of safe use of hanging basket scaffold
(1) The operating requirements for the fabrication, installation, use and construction of hanging basket scaffolding shall comply with the Safety Regulations for Hanging Baskets Working at Heights (JG5027-92).
(2) After the assembly is completed, carry out no-load test run, 1.25 times construction load test, safety rope and safety lock impact test, which can be put into use only after being signed by the technical, quality and safety departments of the enterprise and the supervisor.
(3) When using, there must be two wire ropes with a diameter of 12.5mm as safety ropes, and they are equipped with qualified safety locks. When safety locks don't work, it is forbidden to use them.
(4) Each construction worker must be equipped with a safety rope, and the construction worker must use the safety rope and safety belt correctly when going up and down the hanging basket.
(5) When the hanging basket is working, the release handle on the manual hoist must be removed to prevent accidents caused by misoperation.
Security measures of intransitive verbs
(1) The hanging basket installer must be in good health, free from diseases such as hypertension, and only those who have passed the training and internship and obtained the operation certificate can take up the post for operation. Hanging basket operators must be in good health, free from diseases such as hypertension, and can only work at their posts after passing the training and internship.
(2) Routine inspection and preparation before work every day include:
(1) Check the technical conditions of roof support system, counterweight structure, working wire rope and safety rope, and immediately correct any abnormality;
(2) Check the hanging basket and lift it repeatedly, check its working condition and confirm that it is normal before it can be officially put into operation;
③ Clean up the dust, garbage and ice residue in the hanging basket.
(3) The hanging basket load shall not exceed 120kg per square meter, and the number of people working on each hanging basket shall not exceed 3, and shall not be concentrated at one end. The hanging basket must shake the handle at the same time to keep the lifting points synchronized.
(4) The operator must abide by the operation procedures, wear safety helmet and safety belt, and the safety belt must be hung on the safety rope. The upper and lower hanging baskets must be protected by safety belts and safety ropes.
(5) It is forbidden to climb the hanging basket after drinking. It is forbidden to play in the hanging basket. It is forbidden to throw anything on the hanging basket.
(6) When the hanging basket is parked in the air, the safety lock should be locked, and the hanging basket should be reliably tied to the building to prevent the hanging basket from shaking. When it is necessary to move, release the safety lock and untie the traction rope. The safety lock has been used for 1000 hours, so it must be checked and calibrated regularly to ensure its safe operation.
(7) When multiple groups of hanging baskets are used at the same time, the gap between hanging baskets shall not be greater than 200mm, and the distance from the wall shall not be greater than 100mm.
(8) In case of rain, snow or strong wind above level 4, the construction operation shall be stopped.
(9) If the hanging basket must be used for welding operation, the wire rope of the hanging basket should be fully protected to avoid damaging the wire rope, and the wire rope should not be used as a conductor.
(10) Pay attention to check and do the following finishing work after homework every day:
(1) Clean up the sundries in the hanging basket, fix the hanging basket on the structure or lift it 3m off the ground, and put away the handle.
(2) Store the excess wire rope in the hanging basket.
③ Lock the safety lock.
(1 1) During use, full-time safety officers shall be designated to be responsible for safety technical inspection, and the inspection shall be recorded in the inspection records to keep the safety management in the industry for future reference.