We often use monitoring and control poles for weak current projects. Generally speaking, we do not attach much importance to this pole. However, in practical applications, what are the things to watch out for?
First, outdoor monitoring pole how to operate
specification
1. The general urban road monitoring poles are all made in accordance with a height of 6 meters and a crossarm of 1 meter. The community surveillance poles are conventionally produced at a height of 3-4 meters and a arm length of 0.8 meters.
Monitoring pole foundation
1. There is no special situation. All the monitoring pole embedded parts concrete is C25ç ¼, and the reinforced bars meet the national standard and wind requirements. The cement is No. 425 ordinary portland cement. The proportion of concrete and the minimum amount of cement shall comply with the provisions of GBJ204-83; the threading of the anchor bolts above the flange plate shall be well wrapped to prevent damage to the threads. Properly place the monitoring pole embedded parts according to the embedded parts installation diagram to ensure the extension of the boom arm.
2. The level of the concrete pouring surface based on the monitoring pole shall be less than 5mm/m to maintain the level of the embedded part of the pole. The flange of the embedded part is 20~30 mm below the surrounding ground, and then the reinforcing rib is covered with a C25 fine stone to prevent water accumulation.
Lightning protection
1. The monitoring rod must have a lightning rod and a good grounding. It is best to add the lead wire to the underground (it is recommended that the conductive rod does not go). The grounding resistance is less than 4 Euro. The direction and the traffic lane are vertical (or as required by the engineer). The anchor bolt is used as the main reinforcement.
installation
1. Hand-hole wells must be set up beside the pole, next to the control box, at the cable bends, when the straight length of the cable duct exceeds 50 meters, or when the cable ducts at both ends are not more than 100 mm apart in the same plane.
2. The internal dimensions of the hand-hole well are 500 (long) × 500 (width) × 600 (deep) MM. The gravel layer is used as the seepage; the cement mortar must be wiped on the four walls of the hand well.
3. 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 sheet whose wall thickness is not less than 1.2mm, and the exterior plastic powder is sprayed to prevent water and theft.
4. The depth of cracks, delaminations, heavy skins, slag inclusions and other defects of the structural steels that may not affect the material and mechanical properties shall not be greater than 1/2 of the negative tolerances on the thickness of the steel material, and shall not be greater than 0.5 mm.
5. Design basis: design wind load: 23m/s2, fatigue life: 30 years, according to the latest national standard version of "carbon structural steel", "construction and acceptance of electrical equipment installation project cable line", "steel structure construction and "Acceptance specifications", "Code for Acceptance of Reinforced Concrete Works" and other relevant specifications for construction.
Production requirements
1, in line with the provisions of the current national standards, and have qualified certification documents. Carbon steel adopts E43 welding rod. The quality of the welding rod should meet the requirements of the latest national standard. Never use welding strips, electrodes with rusted or corroded electrodes, and rust-bearing welding wires. The welding size meets the design requirements and the welding wave on the weld metal surface is even. It must not affect the strength of cracks, slag inclusions, welding defects, burn-through, unmelted, craters and needle-like pores, and there are no defects such as wrinkles and interruptions. The fillet depth in the weld zone must not exceed 0.5 mm, and the cumulative total length must not exceed 10% of the total weld length. The width of the weld is less than 20mm, the remaining height of the weld is 1.5mm~2.5mm, the fillet height of the fillet weld should be 6mm~8mm, and the fillet size must not be smaller than the design dimension.
2. Anti-corrosion treatment uses hot-dip galvanized steel. Before the antiseptic treatment, the steel member shall be effectively rust-removed. The thickness of hot dip galvanized shall not be less than 85um, and the zinc layer shall be uniform. When the copper sulphate solution is used for etching test, more than 4 times Without exposed iron, the zinc layer should be firmly bonded to the metal body. After a hammer test, the zinc layer does not peel off and does not protrude. After the zinc dipping, passivation treatment shall be carried out and the salt spray test shall be passed for 48 hours. For every 100 m rod, the linearity error measured on its axis does not exceed 0.5 ‰, and the linear full-length error of the rod does not exceed 1 ‰.
Embedded parts
1. The basic reinforcement cage should be temporarily fixed, and at the same time ensure that the reinforcing steel pet's basic roof plane is horizontal, that is, use the level ruler to measure in the two vertical directions of the foundation roof, and observe that the bubbles must be centered; the monitoring base embedded part must be concrete poured. Solid, no concrete hollowing;
2. Pre-embedded nozzles shall be sealed with plastic paper or other materials before construction to prevent the concrete from leaking into the buried pipe when the concrete is poured, resulting in blockage of the buried pipe; after the foundation is poured, the foundation surface must be higher than Ground level 5MM ~ 10MM; concrete must be maintained for a period of time to ensure that the concrete can reach a certain degree of installation strength.
3. Each metal pole must be grounded, and its grounding resistance is less than 4 ohms. The specific data of each pole shall be subject to on-site construction requirements.
Intersection
1. Road monitoring poles generally require the use of small-sized wells. For the convenience of equipment installation, wells should be installed near the monitoring poles. When the groundwater level is not high, only the gravel (sand) cushions at the bottom of the wells can be used for the rainy days. The stagnant water seeps into the ground, but below the borehole wall there must be a concrete foundation cushion and silo powder cement mortar. When the groundwater level is high, a 10CM concrete cushion is added to the bottom of the well and the wellbore and bottom of the shaft are painted and waterproof. Mortar
2, net size 500 × 500 × 600 (length × width × height), the use of Mu10 brick M5 cement mortar 240 thick masonry, cover with Φ8 @ 150 bidirectional configuration C20 ç ¼ prefabricated board thickness of 60 thick, elevation with the sidewalk or In the green belt, the surface of the board must be smooth and the hole should be raised. The cover plate should be made according to the national standard. The concrete construction data of each well is subject to the on-site construction requirements.
Second, how to choose the right monitoring pole
When purchasing a monitor pole, you can generally consider from three points:
First, it has a good quality pole. Generally better control rods are made of high-quality seamless steel tubes. Such a main pole can have stronger pressure resistance. Therefore, everyone must look at the production material of the monitor's main pole when buying the monitor.
Second, it has a thicker wall. The generally better monitoring rods have a relatively large wall thickness, because the thick wall allows the monitoring rods to have better wind resistance and pressure capacity. Therefore, we must understand the thickness of the wall when purchasing the monitor.
Third, it has convenient installation features. Generally better control rods have the characteristics of flexible installation. Because only the operation is simpler than the ordinary monitor bar, it can have a better user experience and thus be more competitive.
Second, according to the surveillance camera to be installed, select the appropriate monitoring pole.
Reasonably select the rods to avoid the camera being shielded in the selection of social security monitoring rods. According to different camera types, it is advisable to choose the height of the manuscript that meets the best monitoring effect: the height between 3.5-5.5 meters can be used as a choice height.
(1) The selection of the height of the gun-type camera pole: For the selection of the gun-type camera pole, try to select the type of the pole whose height is relatively low, and usually choose the pole whose height is between 3.5-4.5 meters.
(2) Selection of dome camera height: The dome camera can rotate 360 ​​degrees and the focal length is adjustable. All the spherical cameras should be selected as high as possible. Usually we choose a pole between 4.5-5.5 meters. Piece type. The various heights of the above-mentioned rods should be based on the distance between the position of the poles and the monitoring target position and the viewing direction, so as to avoid the appropriate monitoring content when the cross arm is too short. In a sheltered environment, one metre or two feet of cross arm should be selected to reduce obstruction.
Third, the monitoring pole installation location selection
The choice of monitoring pole points requires comprehensive consideration of environmental factors:
(1) The distance between the pole point and pole point should not be less than 300 meters in principle;
(2) In principle, the position of the pole should not be less than 5 meters from the monitoring target area, and the maximum distance must not be greater than 50 meters. This can ensure that the monitoring picture can contain more valuable information;
(3) Where light sources are nearby, light sources are preferred. But pay attention to the installation position of the camera should be in the direction of light;
(4) Try to avoid installing in high contrast areas. If it is necessary to install, consider:
1 Open the exposure compensation (the effect is not obvious); 2 use the fill light; 3 set the camera of the underground passage outside the entrance; 4 set it in the channel inside.
(5) Position the poles as far as possible to avoid greening trees or other obstructing objects. If it is necessary to install them, consideration should be given to avoiding the shelter of trees or other shelters, and leaving space for the subsequent growth of the trees;
(6) When surveying, it is necessary to pay attention to, as far as possible from the * signal, street light distribution box, the government, larger companies, institutions (such as: government departments, bus companies, water supply groups, hospitals, etc.) to take power, to facilitate coordination, Improve the stability of electricity. Try to avoid electricity for small business users, especially for civilian use.
(7) The bolts installed on the side of the road should pay attention to the reverse shooting of pedestrians and non-motorized lanes.
(8) The camera installed at the bus station should be arranged in the direction of the rear of the vehicle as far as possible to avoid the headlights of the vehicle and facilitate the capture of people on the bus.
It is worth noting that in the monitoring pole installation specification, the monitoring rod must have a lightning rod and a good grounding protection. It is better to add the lead wire into the underground (it is recommended not to conduct the rod conduction), so to ensure the long-term normal front-end equipment Work, all kinds of signal installation matching surge protectors are essential, and need to do standard grounding.
The cameras are installed on the poles. If the soil condition is better (less sandstone and other non-conductive materials), the poles can be directly grounded. The pit size is 2000×1000×600mm, and the bottom soil or damp The proportion of soil reaches 85%, fill fine soil, and then vertically embedded a 1500mm × 12mm steel bar, pouring concrete, when reaching the surface, embedded bolts (fixed in accordance with the size of the pole base), including a bolt Can be welded with rebar and used as a grounding electrode. After the concrete is fully stabilized, fill it with fine soil and ensure that it is moist. Finally, the ground wire of the camera and the lightning arrester can be directly welded on the ground pole on the pole. Do a good job of anti-rust treatment, and mark the nameplate.
For example, if the soil condition is poor (more non-conductive materials such as sand and sand), then use a material that increases the contact area of ​​the grounding body. The use of resistance reducing agents, flat steel and angle steel. Specific measures: The previous operation is as above. Before pouring the concrete foundation, a chemical resistance-reducing agent with a thickness of 150 mm should be laid along the pit wall, in which an angle steel of 2500×50×50×3 mm is embedded, and (iron) is used for 40×4. The flat steel is pulled down along the pole, and the lightning protection device and the camera's ground wire are properly welded with the flat steel. The flat steel is welded with the underground angle steel (iron), and the ground resistance test is less than 10 ohms according to the national standard.
Fourth, monitoring pole installation precautions
The position of the pole should be no less than 5 meters from the monitoring target area, and no more than 50 meters from the maximum distance. This can ensure that the monitoring picture can contain more valuable information.
Where light sources are nearby, light sources are preferred. But pay attention to the installation position of the camera should be in the light direction.
Try to avoid installing in areas with high contrast. If it is necessary to install, consider: 1 Exposure compensation is turned on (the effect is not obvious); 2 Use fill light; 3 Set the camera of the underground tunnel outside the entrance and exit; 4 Set it in the tunnel.
The position of the pole shall be as far as possible to avoid the greening trees or other obstructing objects. If it is necessary to install, it is necessary to consider avoiding the shelter of trees or other shelters, and to leave space for the subsequent growth of the trees.
When surveying, it is necessary to pay attention to, as far as possible from the * signal aircraft, street light distribution box, the government, larger companies, institutions (such as: government departments, bus companies, water supply groups, hospitals, etc.) to take power, to facilitate coordination, improve electricity use Stability. Try to avoid electricity for small business users, especially for civilian use.
The bolting machine installed on the side of the road should pay attention to the reverse shooting of pedestrians and non-motorized lanes.
The camera installed at the bus station should be arranged in the direction of the rear of the vehicle, avoiding the headlights of the vehicle and facilitating the capture of people on board.
A reasonable cross arm length should be selected according to the distance between the pole position and the monitoring target position and the viewing direction, so as to prevent the cross arm from being too short to capture suitable monitoring content.
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