This project is located in a company in the western suburbs. This is a five-story framed office building. According to the actual situation on site, prepare external scaffolding with a total height of 25 meters, and use dense mesh safety net for enclosure.
Second, the erection materials
1, scaffolding is made of Ф 48 mm steel pipe with a wall thickness of 3.5mm, and cantilever steel is made of 16# I-beam, the quality of which conforms to the current national standards.
2. Scaffolding steel pipe size, the maximum length of horizontal rod is 2.2m, the maximum length of other rods is 6.5 m, and the maximum mass of each steel pipe is not less than 25KG.
3. The surface of the steel pipe is flat and smooth, without cracks, scars, delamination, dislocation, hard bending, burr, indentation and deep scratches.
4. It is forbidden to punch holes in the steel pipe, and the steel pipe should be coated with antirust paint before use.
5. Fastener materials must comply with the provisions of steel tube scaffold couplers (GB 1583 1).
(1) The new fastener has the production license, the inspection report of the statutory inspection unit and the product quality certificate. When the quality of fasteners is in doubt, sampling inspection shall be conducted according to the current national standard steel tube scaffold couplers (GB 1583 1). It is forbidden to use unqualified products.
(2) Before using the old fasteners, quality inspection shall be carried out. Cracks and deformations are strictly prohibited, and sliding bolts shall be replaced.
(3) Rust prevention of new and old fasteners.
6, the foot hand piece is made of bamboo foot hand piece, without mildew and corrosion.
7. The dense mesh safety net must have products certified by the competent construction department.
III. Foundations and foundations
1, scaffolding foundation and foundation construction, according to the height of scaffolding, the original soil or backfill soil must be compacted in advance, (the foundation can bear 0.8 kg/cm ㎡) and then C20 concrete with a thickness greater than 10cm is poured for hardening, and the 2m plane is along the periphery of the pole foundation, and the foundation and structure can bear the bath load.
2. The scaffold bottom elevation is 50 mm higher than the natural ground.
3. A drainage ditch with a cross section of 20cm×20cm should be set on the outside of the vertical pole foundation.
Four, scaffolding design size
1, the scaffold bottom interval is 2m, and the rest intervals are1.8m.
2. The vertical distance of the vertical pole is 1.5m, and the horizontal distance is1.2m. ..
3. Starting from the second step, the skirting bar and protective bar shall be set at 0.3m and 2m respectively at * * *, and the top row of protective bars shall be no less than two, with heights of 0.9m and 1.3m respectively.
4. The bracing is set as a row of bracing with a spacing of 9m(6 spans).
5, even the wall is set vertically to each floor, and four spans are set horizontally.