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Construction plan and construction process of scaffolding

by:Shizhan     2020-09-19
Scaffolding needs to consider the requirements of construction period, quality and safety in the construction plan and construction process, so the following points should be fully considered when choosing the plan:
1. The structure design of the frame body strives to ensure that the structure is safe and reliable, and the cost is economical and reasonable.
2. It can fully meet the expected safety and durability under the specified conditions and within the specified period of use.
3. When selecting materials, strive to be common, recyclable and convenient for maintenance.
4. When selecting the structure, strive to make sure the force is clear, the structural measures are in place, the lifting is convenient, and it is convenient for inspection and acceptance;
Material selection of scaffolding
l. Steel pipe scaffolding floor stand, choose outer diameter 48mm, wall thickness 3.20mm, steel strength grade Q235-A, steel pipe surface should be straight and smooth, there should be no cracks, delamination, indentation, scribe and hard bend, new The steel pipe used must have a factory certificate. Before scaffolding is constructed, the steel pipes must be sampled and sent to a test unit with relevant national qualifications for mechanical tests such as bending and tensile strength of the steel pipes. The test results can be used in construction only after meeting the design requirements.
2. The use of steel scaffolding and the use of malleable casting fasteners should meet the construction requirements and be provided by a manufacturer with a fastener production license. There should be no forging defects such as cracks, pores, shrinkage, sand holes, etc., fastener specifications It should be matched with the steel pipe, the pasting surface should be dry and neat, the movable part should be flexible, and the minimum distance of the opening when clamping the steel pipe should not be less than 5mm. The steel pipe bolt shall not be damaged when the tightening torque reaches 70N.m. If old fasteners are used, the fasteners must be sampled and sent to a test unit with relevant national qualifications to conduct tests on the anti-sliding force of the fasteners, and the test results can be used in construction after meeting the design requirements.
3. Before setting up the shelf, it should be maintained, rust removed and uniformly painted, and the color should be beautiful. The scaffolding poles, protective railings, and skirting poles are uniformly painted yellow, and the shear supports are uniformly painted orange. The bottom row of vertical poles and sweeping poles are painted in red and white.
4. The use of scaffold and scaffold meets relevant requirements.
5. The safety net adopts a dense mesh safety net. The mesh should meet 2000 mesh/100cm2, and the penetration test will not penetrate. The weight of a 1.6×1.8m single net should be more than 3kg. The color should meet the environmental effect requirements. Choose green . It is required to be flame retardant, and the safety net used must have a product production license and a quality certificate, as well as a license issued by the Wenzhou Construction Safety Supervision and Administration Department.
6. Steel pipes are used for connecting wall fittings, and their material should meet the requirements of current national standards.
7. The profile steel horizontal cantilever rod adopts No. 16a channel steel, and the diagonal rod adopts a 5.6 No. angle steel 56 × 3 × 6.0 mm steel pipe.
8. The diameter of the embedded bolt is 20.0 mm.
Ladder scaffolding
The process of scaffolding erection
Ordinary cantilever
The process flow for erecting cantilever scaffolding is: horizontal cantilever→longitudinal sweeping pole→upright pole→horizontal sweeping pole→small horizontal bar→large horizontal bar (joist)→scissors→connecting wall fittings→paving scaffolding→tightening protective railing →Put a safety net.
Fixed distance positioning. Use a ruler to measure the distance between the inner and outer vertical poles and the wall at the four corners of the building according to the structural requirements, and mark them; use a steel tape to straighten, separate the positions of the vertical poles, and use small bamboo pieces to mark the vertical poles; pad, base It should be accurately placed on the positioning line, and the backing plate must be laid flat and not suspended.
In the process of erecting the first floor of the scaffolding, an oblique support is installed in each frame of the surrounding area, and the corners are added in both directions, and the scaffolding and the wall of the main structure can be removed after the scaffolding is reliably connected. When the scaffolding operation layer is two steps higher than the connecting wall, it is advisable to set up the outer row first and then the inner row. The rest click on the construction requirements to set up.
Main pole foundation
The foundation of the scaffold of this project should be tamped after backfilling, and hardened with concrete with a strength grade of not less than C15, and the hardened thickness of the concrete is not less than 10cm. The foundation bearing capacity can meet the erection requirements of the outer scaffolding (refer to the scaffolding calculation book for specific calculation data).
Pole spacing
(1) The vertical distance of the scaffolding pole is 1.5m, the horizontal distance is 1.05m, and the step distance is 1.8m; the distance between the connecting wall poles is 3.6m vertically and 4.5m horizontally (that is, two steps and three spans): the inner pole is 0.3m away from the building.
(2) The bottom pole of the scaffold adopts staggered arrangement of steel pipes of different lengths, so that the butt joints of the steel pipe poles are staggered, and the height directions are staggered by more than 500mm. It is required that adjacent joints should not be in the same span of synchronization to ensure the scaffolding Integrity.
(3) The vertical pole should be provided with skids and vertical and horizontal sweeping poles, connected to the standing point pole, about 20cm away from the base.
(4) The vertical deviation of the pole should be controlled at no more than 1/400 of the erected height.
Crossbar settings
(1) The distance between the large cross-bars in the height direction of the scaffolding is 1.8m, so that the vertical net can be hung. The large cross-bars are placed inside the vertical rods, and the extension of each side is 150mm.
(2) The outer frame is provided with a small crossbar at the intersection of the vertical rod and the large crossbar, and both ends are fixed on the vertical rod to form the overall force of the space structure.
Scissors
A pair of scissor braces should be set at both ends of the outer facade of the scaffold, and should be set continuously from bottom to top; the net distance between the scaffold braces in the middle should not be greater than 15m. The length of the scissor support diagonal bar should be lapped, and the lap length shall not be less than 1m, and shall be fixed by not less than 2 rotating fasteners. Scissors support diagonal rods should be fixed on the protruding end or vertical pole of the horizontal horizontal rod that intersects with rotating fasteners. The distance between the center line of the rotating fastener and the main node should not be greater than 150mm.
Laying requirements
(1) Wooden boards should be laid between the inner row of uprights and the structural layer of the scaffold: the board width is 200mm, and the inner and outer uprights should be covered with scaffold boards without probe boards.
(2) The scaffolds of the full-paved layer must be laid vertically and horizontally, and the full-paved floor must be in place without leaving any space. Effective protective measures must be taken where the full-paved floor cannot be covered.
(3) The scaffold piece must be tied in parallel with 18 lead wire double strands, no less than 4 points, the binding is required to be firm, the junction is flat, and the scaffold piece must be intact when laying, and if it is damaged, it should be replaced in time.
Protective railing
(1) The outside of the scaffold is closed with a qualified green dense-mesh safety net certified by the competent construction authority, and the safety net is fixed on the inner side of the outer pole of the scaffold.
(2) Use 18 lead wire to hang the safety net, which requires tightness and leveling.
(3) The outer side of the scaffolding must be equipped with 1.2m high protective railings and 30cm high kicking poles. The top row of protective railings must be no less than 2 with a height of 0.9m and 1.3m respectively.
(4) The inner side of the scaffold is formed on the edge (in case of large-open door and window holes, etc.), 1.2m protective railing and 30cm high kicking poles are set on the inner side of the scaffold.
Wall pieces
(1) The scaffolding and the building are 4.5m in the horizontal direction and 3.6m in the vertical direction, with a tie point. If the floor height exceeds 4m, it will be encrypted in the horizontal direction. If the floor height exceeds 6m, a diagonal steel wire rope shall be installed every 6m in the horizontal direction.
(2) The tie points are encrypted in the corner range and at the top, that is, within 1 meter of the corner, a tie point is set every 3.6 meters in the vertical direction.
(3) The tie point should be firm to prevent it from moving and deforming, and should be set as far as possible at the junction of the large and small cross bars of the outer frame.
(4) The tie points of the exterior wall decoration stage must also meet the above requirements. When the original tie points are removed due to construction needs, reliable and effective temporary tie points must be reinstalled to ensure the safety and reliability of the outer frame.
Closed inside the frame
(1) The net distance between the poles in the frame of the scaffold and the wall is 200mm. If it is larger than 200mm due to the limitation of the structure design, the stand-in panels must be laid, and the stand-in panels are set flat and firm.
(2) Scaffolding sheets or wooden boards should be used to seal the scaffolding construction layer between the poles and the building.
(3) The outer frame below the construction layer is closed with dense mesh or other measures every 3 steps and the bottom.
The longitudinal spacing of the supporting structure section steel is the same as that of the upper scaffolding poles, and the poles are directly supported on the cantilevered support structure. The upper scaffold pole and the supporting structure should have reliable positioning and connection measures to ensure the stability of the upper frame. Usually, a 150-200mm steel pipe with an outer diameter of φ40mm is welded on the cantilever beam or longitudinal steel beam, the pole is sleeved outside, and a sweeping pole is set at the bottom of the pole.
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