1. The fastener type single row rack in the steel pipe scaffold should not exceed 24m, and the fastener type double row rack should not exceed 50m. Gantries should not exceed 60m
2. Single racks in wooden scaffolding should not exceed 20m, and double racks should not exceed 30m.
3. No single row rack shall be erected in the bamboo scaffolding, and the double row rack shall not exceed 35m.
Second: The requirements for scaffolding construction should meet the following requirements:
1. The vertical and horizontal rod steps of single and double row scaffolds should not exceed 2.1m, and the horizontal distance of vertical poles should not exceed 1.6m.
2. The connection of wall elements (or wall rods) to the building structure should be carried out at regular intervals and must not be removed during the use of the scaffold.
3. Scissor braces shall be installed along the outside of the scaffold and be erected and removed synchronously with the scaffolding.
4. When the height of the double-row fastener type steel scaffold exceeds 24m, lateral bracing shall be set.
5. Horizontal shelves must be provided at the upper part of the top gantry of the portal steel pipe scaffolding, at the wall setting section and at the protective shelter.
6, bamboo scaffolding should set the top struts, and tied together with the pole upright horizontal horizontal bar.
7. When the height is over 40m and there is wind eddy current effect, the measures against the wind vortex upturn should be set.
8, the scaffolding board must be laid in accordance with the width of the scaffolding, paving, and the clearance between the scaffolding board and the wall should not be greater than
200mm, protective layer must be installed below the working layer scaffolding.
9, outside the operating layer, should be set according to the provisions of protective railings and feet.
10. Scaffolding shall be closed by means of dense mesh safety nets as required.
The masonry bit is a variation of the Twist Drill Bit, the bulk of the Tool is a relatively soft steel, and is machined with a mill rather than ground. An insert of tungsten carbide is brazed into the steel to provide the cutting edges.
Masonry bits typically are used with a Hammer Drill, which hammers the bit into the material being drilled as it rotates; the hammering breaks up the masonry at the Drill Bit tip, and the rotating flutes carry away the dust.
Hammer drill bits often use special shank shapes such as the SDS type, which allows the bit to slide within the chuck when hammering, without the whole heavy chuck executing the hammering motion.
Masonry bits of the style shown are commonly available in diameters from 3 mm to 40 mm. For larger diameters, core bits are used. Masonry bits up to 1,000 mm (39 in) long can be used with hand-portable power tools, and are very effective for installing wiring and plumbing in existing buildings.
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