The cup-hook steel pipe scaffolding consists of steel pipe uprights, cross bars, cup-hook joints, etc. Its basic structure and erection requirements are similar to those of the coupler-type steel pipe scaffolding, and the main difference lies in the cup-hook joint. The cup-hook joint consists of an upper cup-hook, a lower cup-hook, a cross bar joint, and a limit pin of the upper cup-hook. Weld the limit pins of the lower cup-hook and the upper cup-hook on the uprights, and insert the upper cup-hook into the uprights. Weld plugs on the cross bars and diagonal bars. During assembly, insert the cross bars and diagonal bars into the lower cup-hook, press and rotate the upper cup-hook, and fix the upper cup with the limit pin.
Erection of joints for cup-hook steel pipe scaffolding
1) The joint is a connecting device between the uprights and the cross bars and diagonal bars, and the joint should be locked. When erecting, first place the upper bowl buckle on the limit pin, insert the joints of the cross bar, inclined bar, etc. into the lower bowl buckle, so that the arc surface of the joint is close to the vertical pole. After all the joints are inserted, put the upper bowl buckle down, and use a hammer to knock the upper bowl buckle convex head clockwise along the tangent until the upper bowl buckle is clamped by the limit pin and no longer rotates.
2) If it is found that the upper bowl buckle is not tight, or the limit pin cannot enter the upper bowl buckle spiral surface, check whether the vertical pole and the cross bar are vertical, whether the two adjacent bowl buckles are on the same horizontal plane (that is, whether the horizontality of the cross bar meets the requirements); whether the coaxially of the lower bowl buckle and the vertical pole meets the requirements; whether the verticality of the horizontal plane of the lower bowl buckle and the axis of the vertical pole meets the requirements; whether the cross bar joint and the cross bar are deformed; whether the arc center line of the cross bar joint is perpendicular to the axis of the cross bar; whether there is mortar or other debris filled in the lower bowl buckle; if it is due to assembly reasons, it should be locked after adjustment; if it is due to the rod itself, it should be removed and sent for repair.
Requirements for the erection of cup-hook scaffolding
The horizontal distance of the cup-hook steel pipe scaffolding columns is 1.2 m, and the vertical distance can be 1.2 m, 1.5 m, 1.8 m, or 2.4 m according to the load of the scaffolding, with a step distance of 1.8 m and 2.4 m. When erecting, the joints of the vertical poles should be staggered. The first layer of vertical poles should be staggered with 1.8 m and 3.0 m long poles. 3.0 m long poles should be used upwards, and 1.8 m and 3.0 m lengths should be used for leveling at the top layer. The verticality deviation of scaffolding below 30 m in height should be controlled within 1/200, and that of scaffolding above 30 m in height should be controlled within 1/400~1/600. The total verticality deviation should not exceed 100 mm.
When the height of the ground-mounted cup-hook scaffolding is H≤20m, it can be erected as a normal scaffolding. When the height of the scaffolding is H＞20m and the formwork support system is super-high, super-heavy, or large-span, a special construction design plan must be formulated, and structural analysis and calculation must be performed.
The cup-hook node consists of an upper cup-hook, a lower cup-hook, a vertical bar, a cross bar joint, and an upper cup-hook limit pin. The cup-hook node of the scaffolding vertical bar should be set according to a 0.6m module.
Safety technical requirements for the dismantling of cup-hook steel pipe scaffolding
(1) When the scaffolding is completed, a dismantling plan should be formulated. Before dismantling, a comprehensive inspection of the scaffolding should be carried out, all redundant objects should be removed, a dismantling area should be set up, and no unauthorized personnel should be allowed to enter.
(2) The dismantling order is from top to bottom, layer by layer, and the upper and lower layers are not allowed to be dismantled at the same time.
(3) The wall support can only be dismantled when the layer is dismantled. It is strictly forbidden to dismantle the wall support before dismantling the scaffolding.
(4) The dismantled components should be lowered by hoisting equipment or manually handed down. Throwing is strictly prohibited.
(5) The dismantled components should be classified and stacked in time for transportation and storage.
Post time: May-15-2025