Before installing the support, a construction plan must be prepared according to the construction drawings, site terrain, pouring scheme, and equipment conditions. The strength, stiffness, and stability should be verified according to the load during each construction phase and implemented after approval.
The installation of the support can start from one end of the box beam and move towards the other end, or it can start from the middle and move towards both ends. The working face should not have too many openings and should not start from both ends towards the middle; it should proceed simultaneously from both longitudinal and transverse directions to avoid instability of the support.
If the foundation is flat and solid, the base of the vertical rod can be directly placed on it. If the foundation is uneven or not solid, adjustable bases for vertical rods should be used at the bottom of the support.
All components used for support must be inspected and approved before use.
The assembly quality of the bottom layer of bowl buckle supports is crucial as it directly affects the overall quality of the support. The assembly quality must be strictly controlled; after installing the lowest two layers of horizontal rods, first check and adjust the squareness and longitudinal straightness of the horizontal frame (for curved supports, ensure correct positioning of vertical rods); secondly, check the levelness of horizontal rods and adjust using adjustable bases for vertical rods to ensure that horizontal deviation is less than L/400 (L is the length of horizontal rods); at the same time, check each vertical rod foot individually to ensure all vertical rods are suspended and secure; once the bottom layer meets construction requirements, check all bowl buckle joints and lock them tight. During assembly, continuously monitor these aspects for adjustments.
When a box beam is a curved beam, adjustments in horizontal rod lengths can create a curved layout for supports.
The installation of supports strictly controls verticality of vertical rods and levelness of horizontal rods. The overall verticality deviation must not exceed h/500 (h is height of vertical rods), but shall not exceed 100mm; levelness of horizontal rods must comply with item (5) above; for straight layout supports, their longitudinal straightness should be less than L/200 (L is total length of longitudinal horizontal rods).
Every 5-7 vertical rods in both longitudinal and transverse directions should have a pair of diagonal braces installed. Each brace width should not be less than 4 spans or less than 6m. The angle with respect to ground should ideally be controlled between 45°-60°. In terms of diagonal brace planes in a vertical direction, there should be groups set up in rows every 3-5 layers; intersections between diagonal braces with horizontal or vertical rods must use rotating fasteners securely locked. If steel pipe lengths are insufficient, connecting fasteners can extend them; diagonal braces must reach from top to bottom with solid padding between their bottoms and foundations to enhance load-bearing capacity.
Supports should have dedicated screw jacks for adjusting formwork elevation and dismantling formwork frames. Each jack should be tightened individually to ensure uniform load distribution across all vertical rods; external overhang length for jacks should not be less than 50mm nor greater than half their own length.
The distance from top row horizontal rod to bottom formwork should not exceed 600mm.
When support height exceeds five times its width, guy ropes must be installed securely. | 
