Second, the project overview and construction conditions
Third, the basic structure
This project adopts manual hanging basket. Manual hanging basket supporting facilities (hanging beam or walking beam at the top of the building), hanging beam rope (steel wire rope or steel plate chain rod), safety wire rope, manual hoist (or chain), and shaped shelf (generally called hanging basket frame).
Meta-design of manual hanging basket. When designing the hanging basket, the strength of the hanging basket must be checked. When making and assembling hanging baskets, we should strengthen technical safety supervision and strictly control the quality to ensure construction safety.
Fourth, the main points of support
1, the gap between the inside of the hanging basket and the building is 100-200mm, and the gap between two hanging baskets shall not be greater than 200mm. The maximum length of hanging basket shall not exceed 8m, the maximum length of homemade hanging basket shall not exceed 6m, the width shall be 0.8- 1.2m, and the height shall generally not exceed two floors. Special needs should be specially designed, and the height of each floor should not exceed 2m. The vertical spacing of hanging basket uprights (or unit pieces) is 2-3m. The height of the protective railing at the top of the outer side of the hanging basket is 1.5m, the spacing between each railing is not more than 500mm, and the skirting board is not less than180mm; . Protective railings must be set outside the hanging basket, with heights of 0.6m and 1.2m respectively, and the height of skirting board shall not be lower than 180mm. In addition, the top of the hanging basket must be provided with a head protection shed, and the outer side and both ends are closed with safety nets.
2. The spacing between the horizontal rods supporting the scaffold is the same as that of the socket rack. Scaffolding must be fastened to the horizontal bar, and there can be no looseness or head control panel. The transverse horizontal bar and the supported longitudinal horizontal bar should also be fastened with fasteners.
3. Telescopic wall wheels and other devices should be installed at both ends of the hanging basket, so that the hanging basket can be close to the building when working, so as to reduce the shaking of the frame; At the same time, the hanging basket with a height of more than one floor should be provided with ladders, and the upper and lower manholes of each floor should have cover plates.
4, steel fasteners should be not less than 100mm, hanging basket frame outside bedding face and both ends of the facet should be added with scissors or brace card.
5. If the hanging basket is made of steel chain rods, the diameter shall not be less than16mm, and the length of each chain rod shall be 800mm. Every 5- 10 chain bars should be connected as a group, and each group should be connected to the required length with a snap ring. Safety rope should be not less than φ 13mm wire rope.
Verb (abbreviation of verb) Operation procedure and construction method The hanging basket is assembled into a hanging basket frame by chain inversion on the ground. The load-bearing steel wire rope and safety wire rope are hung on the cantilever beam of the roof, and then the heavy steel wire rope is passed through the rope guide hole of the manual hoist, pressed towards the hook, and the front handle is pulled back and forth to lift the hanging basket, and the upper and lower handles can be pulled back and forth, but it is not allowed to fall at the same time. If the steel chain is used as the load-bearing hanger, the safety rope and the steel chain should be hung on the fixed roof cantilever beam first, and then the inverted chain should be hung on the upper and lower parts of the steel chain to hang the hanging basket, and the inverted chain should be used for lifting. Because the chain changing stroke is limited, it is necessary to change and change the chain many times during the lifting process, and manually lift and change the chain, so as to relay the lifting.
Technical parameters of manual safety lock for LSL-63 hanging basket: 123456, allowable impact force, rope locking speed, working load, wire rope (specification φ 12.5-6× 19), and the effective calibration period is 6300 n1/kloc.
Six, steel tube combination hanging basket frame calculation
The hanging basket frame consists of hanging basket pieces and steel pipes (using fasteners), and the hanging basket pieces are connected with φ48 steel pipes to form an integral truss system. When calculating, the hanging basket is regarded as composed of two longitudinal trusses, and one of them is taken for internal force analysis and strength check.
1, load calculation
(1) The self-weight of the hanging basket frame is 500/nm2, and the width of the hanging basket frame is12m, so the load of each frame is q1= 550×1.2/2 = 330n/m.
(2) If the construction load is 120N/, Q2 =1200x1.2/2 = 720n/m.
(3) the total load q = q1+Q2 = 330+720 =1050n/m.
1, internal force and section calculation
(1) bending moment mmax =1/8q12 =×1050× 2.52 = 820 n.m φ 48× 3.5 mm steel pipe, cross section, sectional resistance moment w = 5075 mm3σ = mmax/w.
Seven. safety measure
1. Operators in the hanging basket should wear safety belts or safety ropes, and the other end of the safety belt should be tied to the structure.
2. The sling of the hanging basket should be inspected and maintained frequently, and should be properly kept when not in use. Worn wire rope shall not be used again. When the hanging basket in use is found to be worn by wire rope, the workers should be evacuated immediately, and the hanging basket should be placed on the ground and replaced with wire rope.
3, hanging basket lifting mechanism, speed limiting mechanism, control device and safety device must be in good condition, and regular inspection and maintenance.
4, strictly control the use load, homework personnel shall not exceed the prescribed number.
5. The wall side of the hanging basket should be provided with supporting rods or supporting wheels, and the hanging basket should be pulled to the structure with ropes to reduce the shaking of the hanging basket.
6. Safety ropes must be set.
The above are collected and sorted by Zhong Da Consulting Company.
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