What are the requirements for erecting bowl-hook type scaffolding?

The horizontal spacing of the columns in a bowl-shaped steel pipe scaffold is 1.2 m, while the vertical spacing can be 1.2 m depending on the load on the scaffold； 1.5 m ； 1.8 m ； 2.4 m, with step sizes of 1.8 m and 2.4 m. When setting up the structure, the joints between the vertical poles should be staggered; for the first layer, vertical poles of 1.8 m and 3.0 m in length should be used in a staggered arrangement, while higher up only poles of 3.0 m length should be used. At the top layer, poles of both 1.8 m and 3.0 m lengths are used to achieve evenness. For scaffolds with a height of 30 m or less, the verticality deviation should be kept within 1/200; for scaffolds taller than 30 m, it should be between 1/400 and 1/600. The overall verticality deviation should not exceed 100 mm.

7.1.1 A construction design or specific plan must be developed prior to the erection of the scaffold to ensure its technical reliability and safe use. It can only be implemented after approval following a technical review. 7.1.2 Before the erection of the scaffold, the technical supervisor shall provide technical instructions to the personnel responsible for its erection and use in accordance with the requirements of the scaffold construction design or the specific plan. 7.1.3 For the scaffolding components that enter the site, their quality should be rechecked before use. 7.1.4 Components shall be classified by type and specification and placed in the stacking area or stacked on dedicated racks, with the quantities counted and set aside for use. The drainage at the scaffold storage area must be unobstructed, with no water accumulation. 7.1.5 If wall connectors are to be installed using embedding, consultation with the designer should take place in advance, and it must be ensured that the embedments are placed before concrete pouring. 7.1.6 The site where the scaffolding is erected must be level, solid, and have proper drainage measures. 7.2 Foundation and Subgrade Treatment 7.2.1 The foundation for scaffolding must be constructed in accordance with the construction design, and inspected to ensure it meets the requirements regarding foundation bearing capacity. 7.2.2 When there is a large difference in foundation levels, the 0.6m node spacing of the vertical poles can be utilized for adjustment. 7.2.3 Poles on soil foundations must be equipped with adjustable bases. 7.2.4 After the scaffold foundation has passed the acceptance inspection, marking and positioning shall be carried out in accordance with the requirements of the construction design or the special plan. 7.3 Erection of scaffolding 7.3.1 The base and pads should be placed accurately on the positioning lines ； The wooden shims should have a length of not less than 2 spans and a thickness of not less than 50 mm ； The axis of the base should be perpendicular to the ground. 7.3.2 The erection of the scaffold shall be carried out layer by layer in the order of vertical poles, horizontal bars, diagonal braces, and wall connectors, with each increase in height not exceeding 3m. The longitudinal straightness of the lower horizontal frame shall be ≤ L/200 ； The levelness between the crossbars should be ≤ L/400. 7.3.3 The erection of the scaffold shall be carried out in stages; the initial erection height is generally 6 m, and it must undergo inspection and acceptance before it can be put into formal use. 7.3.4 The erection of the scaffolding should progress in sync with the construction of the building, with each elevation increase being at least 1.5m higher than the floor to be constructed. 7.3.5 The verticality of the scaffold at its full height shall be less than L/500 ； The maximum allowable deviation should be less than 100 mm. 7.3.6 When cantilever beams are added to the inner and outer sides of the scaffold, only pedestrian loads are permitted within the area covered by these cantilever beams; the stacking of materials is strictly prohibited. 7.3.7 Wall connectors must be installed in the designated positions as the scaffold height increases, and it is strictly prohibited to remove them arbitrarily. 7.3.8 The setup at the working level shall meet the following requirements: 1 The scaffold planks must be installed throughout the area, and guard plates as well as protective railings shall be provided on the outer side ； 2 The protective railing can be constructed with crossbars at two levels, 0.6m and 1.2m above the coupler joints of the vertical posts ； 3 The horizontal safety nets under the working layer shall be installed in accordance with the provisions of the Safety Technical Specifications. 7.3.9 When steel pipe fasteners are used as reinforcement elements, wall connectors, or diagonal bracing, the relevant provisions of the \"Safety Technical Code for Fastener-Type Steel Pipe Scaffolds in Building Construction\" (JGJ130-2002) must be complied with. 7.3.10 When the scaffold is erected to its full height, technical, safety, and construction personnel should conduct a comprehensive inspection and acceptance of the entire scaffold structure, addressing any structural defects that exist promptly.

Erection requirements: For bowl-type steel pipe scaffolds, the horizontal spacing between columns is 1.2 m, while the vertical spacing can be 1.2 m depending on the load on the scaffold； 1.5 m ； 1.8 m ； 2.4 m, with step sizes of 1.8 m and 2.4 m. When setting up the structure, the joints between the vertical poles should be staggered; for the first layer, vertical poles of 1.8 m and 3.0 m in length should be used in a staggered arrangement, while higher up only poles of 3.0 m length should be used. At the top layer, poles of both 1.8 m and 3.0 m lengths are used to achieve evenness. For scaffolds with a height of 30 m or less, the verticality deviation should be kept within 1/200; for scaffolds taller than 30 m, it should be between 1/400 and 1/600. The overall verticality deviation should not exceed 100 mm.

Summary: Requirements for the erection of bowl-clamp type scaffolds 1. The horizontal spacing between the columns of a bowl-clamp type steel pipe scaffold is 1.2 m; the vertical spacing can be 1.2 m, 1.5 m, 1.8 m, or 2.4 m, depending on the load applied to the scaffold. The step spacing is 1.8 m or 2.4 m. 2. When setting up the structure, the joints between the vertical poles should be staggered. For the first layer, vertical poles of 1.8m and 3.0m in length should be used in a staggered arrangement; from the upper layers onward, only 3.0m long poles should be used, and at the top layer, poles of both 1.8m and 3.0m lengths should be used to achieve evenness. 3. For scaffolds with a height of 30 m or less, the verticality should be within 1/200; for scaffolds with a height exceeding 30 m, the verticality should be maintained between 1/400 and 1/600. The overall verticality deviation should not exceed 100 mm. This post was last edited by zhangya*ong on 2009-3-31 12:48]