Monitor Bar Installation Requirements: 1 Hand hole wells must be provided when the pole, the control box, the cable bend, the linear length of the cable tube exceeds 50 meters, or the cable tubes at both ends are not more than 100 mm apart from each other.

2, the size of the inner hole of the hand hole is required to be 500 (length) × 500 (width) × 600 (deep) MM, using gravel ply as water seepage; hand wall well must be smeared with cement Mortar.

3, the control box is equipped by the equipment manufacturer according to the required capacity, the shell is made of high-quality cold-rolled steel plate with a wall thickness of not less than 1.2mm, and the external plastic powder is sprayed and waterproof and anti-theft.

4. The steel used for the structure of the monitoring rod shall not affect the cracks, delamination, heavy skin, slag inclusions, etc. of the material and mechanical properties. The depth of the pitting or scratch shall not exceed 1/2 of the negative tolerance of the steel thickness. And should not be greater than 0.5mm.

5. Design basis: design wind load: 23m/s2, fatigue life: 30 years, according to the latest national standard version of "carbon structural steel", "electrical installation engineering cable line construction and acceptance specifications" Construction of “Code for Construction and Acceptance of Steel Structure Engineering” and “Code for Construction Acceptance of Reinforced Concrete Engineering”.

Monitor Requirements :

1. Compliance with current national standards and certification documents. Carbon steel adopts E43 type electrode. The quality of the electrode should comply with the latest national standard. Never use the electrode with the peel off, the rust or damp of the core, and the rusted wire. The welding size meets the design requirements, the welding wave surface of the weld metal is uniform, and it must not affect the strength crack, slag inclusion, weld bead, burn through, unmelted, crater and needle vent, and there are no defects such as wrinkles and interruption. The depth of the bite in the weld zone shall not exceed 0.5 mm, and the total length shall not exceed 10% of the total length of the weld. The weld width is less than 20mm, the weld height is 1.5mm~2.5mm, the fillet weld height should be 6mm~8mm, and the weld angle is not allowed to be smaller than the design size.

2. The anti-corrosion treatment adopts hot-dip galvanizing. Before the anti-corrosion treatment, the steel components should be effectively derusted. The thickness of hot-dip galvanizing is not less than 85um, the zinc layer should be uniform, and the copper sulfate solution is used. /p>

When the etching test, 4 times or more does not expose iron, the zinc layer should be firmly bonded to the metal body. After the hammer test, the zinc layer is not peeled off and does not bulge. After immersion in zinc, passivation treatment should be carried out, and the 48h salt spray test is qualified. For every 100 m rod, the straightness error of the axis measurement does not exceed 0.5 ‰, and the linear error of the full length of the monitor rod does not exceed 1 ‰.