What are the steel pipe scaffold erection norms

What are the steel pipe scaffold erection norms

1, the material of steel pipe and specifications

Generally adopt appropriate GBT00 ordinary carbon structural technical conditions of technical requirements of A3 steel, flat and smooth appearance, no crack, delamination, distorted, make hole section and is less than 0.5 mm steel pipe corrosion degree, must have the manufacturer's quality certificate or rental unit quality assurance certificate.

All fasteners shall be preferred 48 mm outside diameter, wall thickness 3-3.5 mm of welded steel pipe used for stud, the ledger and diagonal length of steel tube with 4-4.5 m advisable for small bar steel pipe length is 2.1 2.3 m.

2, fastener materials and specifications

Fastener is specially for the bar to steel pipe scaffold for connection, it has to turn right (cross) and docking (a word) three forms, fasteners should be malleable cast iron, its technical requirements shall be met GB15831 "steel pipe scaffold fastener" regulation, it is forbidden to use deformation, crack, oil silk, sand holes and other ills of fasteners are not allowed to sustain tension along axis direction; The right-angle fastener forbid along the cross axis under torsion; Docking fastener is unfavorable and sustain tension, when used in vertical nodes, the only allowed under pressure, fastener bolt tightening torque should be controlled between 40 to 50 nm, using the right Angle and rotary fasteners, fastening, steel pipe end, should extend fastener cover plate edge, no less than 100 mm, the fastener grip the pole, the opening minimum distance not less than 5 mm, rotating fastener clearance at both ends of the rotating surface needs to be less than 1 mm.

3, scaffolding material and specifications

Wooden planks should use the thickness of not less than 50 mm pine or pine board, plate width should be 200-300 - mm end also used 10-14, galvanized iron wire binding, prevent craze, decayed, bug eat by moth, twisted, broken, and shall not be used with large cross section of wood.

Bamboo scaffolding can be divided into bamboo basketry scaffold board and bamboo scaffolding, bamboo basketry scaffold board is made of flat belt everyouth bamboo woven, each root bamboo width not less than 30 mm, thickness of less than 8 mm, one against one edge is vertical and horizontal transverse steel reinforcement intersection points, tied with wire, plate is generally 2-2.5 mm long, 0.8 1.2 m wide, bamboo scaffolding is bolted to pull side made of bamboo and connection, bolt 8-10 mm in diameter, spacing between 500-600 mm, the first bolt from 200-250 - mm plate end, plate length is generally 2-2.5 mm, width is 250 mm, thickness is generally not less than 50 mm. Every bug eat by moth, brittle, loose bamboo scaffolding shall not be used.

4, the installation of safety net requirements

(1) the width of the flat screen should not be less than 3 m, set net height shall not be less than 1.2 m, each net weight should not be commonly more than 15 kg.

(2) when installation, on the department of each node, rope should rely on tight and adhesion (frame), and a separate lashing even pull, department of nodes are distributed along the network edge, the distance shall not be greater than 75 cm, nodes should comply with the knot is convenient, the connection of strong and easy to open, not out after mechanical principles.

(3) installing a flat screen, need to abide by the following rules.

A, install flat screen should be parallel to the horizontal plane or outside the observed low, generally with 15 ゜ advisable.

B, net load is generally not more than 6 m (6 m) due to the need of construction. Allow more than 6 m, but not more than 10 m, the largest absorption and must be attached to the frame of steel rope, etc. High security load 5 m (5 m), net should be at least out of buildings (or the edge of operating point) 2.5 m, the load more than 5 m to 10 m high, should be at least 3 m.

C, network installation shoulds not be tense, recommended width of 3 m and 4 m net, after installing the width of the horizontal projection of 2.5 m and 3.5 m respectively.

D, mesh and its minimum distance on the surface of the object should not be less than 3 m below.