Monitoring rod construction standard

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1. The general urban road monitoring rods are made according to the height of 6 meters and the cross arm of 1 meter. There is no special case for all the monitoring parts of the pre-embedded concrete is C25ç ¼, and the steel bars are in line with the national standard and subject to wind requirements. The cement is 425 ordinary Portland cement. The proportion of concrete and the minimum amount of cement should meet the requirements of GBJ204-83;

2, the monitoring rod must have a good grounding, preferably with the lead into the ground (recommended conductive does not go to the rod body), its grounding resistance is less than 4 ohms;

3. The thread above the flange of the pre-embedded anchor bolt is well wrapped to prevent damage to the thread. According to the installation drawing of the embedded parts, the embedded parts of the monitoring poles are correctly placed to ensure that the protruding direction of the arms is perpendicular to the driving lane (or according to the requirements of the engineer), and the anchor bolts are used as the main ribs;

4. The flatness of the concrete pouring surface of the monitoring pole foundation is less than 5mm/m as far as possible to maintain the level of the embedded parts of the pole. The embedded flange is 20~30 mm lower than the surrounding ground, and the reinforcing rib is covered with C25 fine stone shovel to prevent water accumulation;

5. When the pole, the control box, the cable bend, the straight length of the cable tube exceeds 50 meters, or the cable tubes at both ends are not 100 mm apart from each other, the hand hole must be set. The inner circumference of the hand hole is required to be 500 (length) × 500 (width) × 600 (deep) MM, and the gravel layer is used for water seepage; the wall of the hand hole must be smeared with cement mortar.

6. The control box is equipped by the equipment manufacturer according to the required capacity. The outer 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.

7. Structural steel shall not affect the material and mechanical properties of cracks, delamination, heavy leather, slag inclusions, etc. The depth of the pitting or scratch shall not exceed 1/2 of the negative tolerance of the steel thickness, and shall not exceed 0.5 mm.

8. 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", "steel structure construction and Construction of the Code of Acceptance and Regulations for the Acceptance of Construction of Reinforced Concrete Projects.

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