Five, frame design introduction
1. Scope of application
1) Wheel buckle scaffolding is suitable for formwork support of non-tall formwork or standard layer formwork support frame.
2) The wheel buckle scaffolding foundation should be tamped and leveled with concrete hardening measures, and the elevation of the foundation should be less and less variable.
3) Wheel buckle scaffolding is suitable for structures with a regular structure.
2. Pole selection
1) The wheel buckle scaffold pole adopts Φ48×3.0mm steel pipe, and the force calculation should be adjusted according to the actual situation on the spot, generally according to Φ48×2.75mm.
2) Standard poles should be used as much as possible for the poles because non-standard poles can only be placed on the top or bottom of the pole uniformly when extending, and the joints of adjacent poles cannot be staggered, and there will be a free length of the pole when set at the top. Longcase.
3) Since each pole is provided with a pole connecting sleeve, the connecting sleeve will increase the total length of a single-pole by 100mm, so when choosing a pole, the length of the pole must be increased to avoid the pole being too long.
3. Crossbar selection
The crossbars are all standard rods, and the length of the rods conforms to the 300mm modulus. Therefore, when designing the frame pole spacing, the calculation should be based on the provided crossbar length. Therefore, the spacing between the poles is flexible to set up a fasteners steel pipe scaffold.
4. Step selection
The setting of the frame step should correspond to that of the roulette. The roulette spacing of the standard pole is 600mm, so the step should meet the 600 moduli when selecting the step. And the distance between the bottom roulette and the bottom of the pole is 350mm, so the sweeping pole is set at 400mm, which does not correspond to other specifications, so please pay attention to it when designing.
5. Frame layout
The layout design is required when the frame is arranged, and the vertical pole is positioned in the electronic drawing in advance. When typesetting, start from one end of the building and position the pole at the other end. The positioning will be carried out according to the predetermined spacing of the poles. If the spacing is insufficient, the horizontal pole level can be reduced for layout, and it should be set on the wall column. side.
For parts with large changes in the elevation of the foundation, such as the position of the toilet drop plate and the folded plate, the frame at this position can be erected separately, and then fasteners can be used to connect it into a whole.
The bottom of the beam should be supported in the form of locking steel pipe fasteners, which can ensure the normal erection of the beam and slab template and facilitate the layout.
Six, construction introduction
1. Construction technology
Measure and pay off the line, determine the position of the beam and slab of the current layer → position the vertical pole and make a cross mark → erect the pole and set up the sweeping pole and the first step crossbar → set up the upper crossbar and scissor support → lock the beam bottom steel pipe → lay the beam bottom Template→laying of the bottom template.
1) Mark the edge lines of each component position on the ground to ensure that the bracket and formwork are constructed according to the design size.
2) Mark the position of the pole on the ground according to the pre-designed position of the bracket, and make a mark to ensure that the pole is arranged neatly.
3) Erect the most angular pole first, and gradually erect the surrounding poles, set up the sweeping pole, and the first horizontal pole to ensure that the erected frame is stable and does not tip over.
4) After the vertical poles are fully erected, erect the upper vertical poles, complete the erection of all the horizontal poles, and reserve beam positions. The scissor brace shall be erected according to the predetermined frame design requirements, and the scissor brace must be erected as a whole according to the requirements.
5) Install longitudinally stressed steel pipes at the bottom of the beam. The stressed steel pipes must be fixed with double fasteners. The elevation of the steel pipes must be checked to ensure that the beam bottom formwork is the design elevation.
6) When laying the beam bottom formwork, the secondary flute should be placed smoothly, and the secondary flute should be placed near the node.
7) When laying the slab bottom formwork, first adjust the top adjustable top support to the predetermined elevation position, and level it by pulling wires to meet the flatness requirements before laying the formwork.
2. Construction requirements
1) Before erecting all formwork supporting full hall scaffolding, you must first be familiar with the plan requirements. According to the height of the floor and the size of the concrete members, determine the spacing requirements of the vertical poles, determine the height of the vertical poles and the position of the vertical poles by the cable. Vertically and horizontally, straight. The upright rod at the bottom of the beam and the upright rod at the bottom of the plate can be integrated by the cross rod.
2) The foundation of the pole should be solid, and a backing plate should be set at the bottom.
3) The pole joints should not be arranged in the same section.
4) The joints of the crossbars need to be clamped tightly, and the ends are in close contact with the vertical rods. After the erection of the frame, the body is completed and during the concrete pouring process, it is necessary to send someone to check the fastening of the crossbars.
5) The extension length of the adjustable bottom support of the vertical pole should not exceed 300mm, the extension length of the adjustable top support of the vertical pole should not exceed 300mm, the inner length of the vertical pole should not be less than 150mm, and the adjustable bottom support and top support must meet the requirements of “Building Construction Socket type disc buckle type steel pipe support safety technical regulations.
6) Plan the acceptance channel for the full hall frame. Between the frames, there should be a passage for people to pass. The first step of the personnel channel can be delayed.
3. On-site situation handling
1) Phenomenon: There is a falling plate on the floor at the bottom of the pole, and the frame body at the position of the falling plate cannot be connected with the surrounding frame body to form a whole when it is normally erected.
Treatment: A thicker backing plate can be set under the vertical pole at the drop plate position to adjust the bottom of the vertical pole to the same elevation, or an adjustable base can be used according to the requirements of the “Technical Regulations for the Safety of Socket Type Steel Pipe Supports in Construction”.
2) Phenomenon: If the height difference of the caisson position or other positions in the bathroom exceeds 300mm, and the adjustable bottom bracket cannot be used to adjust, the frame body is separated from the whole.
Treatment: Use fasteners to connect the crossbar that cannot be connected normally to the vertical rod.
3) Phenomenon: When the floor height is limited, the formwork support pole needs to use a single non-standard rod, which causes the free length of the top of the pole to be too long.
Treatment: Add a roulette at the top of the vertical pole. The position of the additional roulette can be determined according to the actual situation on-site and ensure that the top height of the roulette is less than the allowable free length, and the pole can still be used normally after adding the roulette.
Post time: Nov-03-2020