Is ANFL resistance reducer a backfiller for lightning protection and grounding?

The use of long-acting anti-corrosion backfiller ANFL anticorrosive backfill:

Ground network construction. Generally, the trench is dug out in accordance with the design requirements at the selected position, and the copper-clad steel grounding rod or angle iron is driven into the appropriate position in the trench (if the angle iron is dug as deep as possible at the position of the angle iron, so that the resistance reducing agent can be laid more around the angle iron, the fruit will be better), and the angle iron is welded with galvanized flat iron (electric welding or Aneng lightning protection exothermic welding can be used, of course, the effect of exothermic welding is much higher than that of electric welding), and the ground grid lead line is welded.

2. Stir the drag reducer and water into a paste.

Stir the drag reducer and water in a 1:1 ratio in a container (e.g., in an iron trough).

3. Laying of resistance reducer.

First, sprinkle some water at the bottom of the trench to moisten the soil, and then apply the stirred resistance reducer to the vertical electrode and the transverse electrode in the grounding trench (or hole), and pay attention to the fact that the surrounding area of the metal conductor, including the bottom, can be wrapped by the resistance reducer relatively evenly.

4. Soil backfill.

After the drag reducer is laid, the originally dug soil is backfilled. When backfilling, it must be noted: If there are bad conductors such as stones and sticks in the soil, they must be removed; When sealing the soil, it is necessary to tamp (step on it) one layer for each layer.

5. Grounding resistance measurement.

The grounding resistance can be measured after the soil is sealed, but because the soil has just been sealed, it has not been settled, and the grounding resistance has not achieved the effect, and the grounding resistance at this time is much higher than the actual one, and the grounding resistance can achieve a stable effect after a week.

6. Waterless construction.

When constructing in water-scarce areas, the powdered resistance reducer (or reduce the proportion of water used) can be placed directly on the grounding electrode and its surroundings (the amount of which is greater than about 20 of the general dosage) to seal and compact the soil. This construction method is simple, and the effect is slightly worse than the construction of water.

Shengtai long-term anti-corrosion and resistance reducing agent is a backfiller for lightning protection and grounding.

In order to make the ground resistance less than the ohm. The method of external jujube preparation is adopted, and the electrolytic ion grounding electrode is uniformly installed as the vertical direct ground electrode to return to the rock, which is combined with the resistance reducing agent and backfiller to reduce the resistance quickly.

1. Introduction to the special grounding device for CET-1000 series towers and base stations.

CET-1000 series special grounding device for tower and base station (also known as: CGT (CET) special electrode grounding device) is based on the core technology of the existing ion grounding device, and combined with the special requirements of the performance and construction of the grounding product of the tower and base station, the special grounding product for the tower and base station is developed.

CGT (CET) special electrode grounding device is composed of four parts: anti-corrosion metal electrode unit, long-term environmental protection resistance reducing agent, general backfiller, and soil conditioner.

2. Product characteristics of CET-1000 series towers and base stations special grounding devices.

1. The installation is very convenient. The electrode unit is installed horizontally, and the amount of excavation is small;

2. No water is required for installation. It is especially suitable for construction sites where water is scarce in the wilderness and high mountains;

3. Efficient drag reduction. The three-layer drag reduction structure is adopted to achieve the best comprehensive drag reduction effect in a limited area.

4. Long service life. The electrode unit is treated with special anti-corrosion, and the composite backfill can be tightly wrapped, which has an inhibition effect on the metal electrode unit;

5. The grounding resistance is stable. The composite backfill is mainly conductive graphite, which conducts electricity by electrons, and the electrode unit will continue to release conductive ions to the surrounding soil to improve the soil around the grounding body, and the grounding resistance has little influence with seasonal changes;

6. High security. This grounding device is designed with a discharge ring structure, which can effectively reduce the ground potential rise caused by large current and ensure the safety of ground personnel.

It should be a one-meter-long vertical body. It mainly guides thunder and lightning into the ground and plays the role of discharge.

The more commonly used vertical ground bodies include round bars, angle bars, steel pipes, copper-clad steel, etc.

Lightning protection grounding and anti-corrosion methods:

In order to reduce the grounding resistance and reduce the corrosion of the grounding body, a protective layer is usually injected between the grounding body and the soil, and the most commonly used is a drag reducing agent. On the one hand, the physical resistance reducer is neutral, which improves the acidity and alkalinity of the medium in contact with the grounding body, and isolates the salt and other media of the soil, and at the same time, the colloid that plays a cohesive role in the resistance reducing agent makes the oxygen content around the grounding body decrease, which is conducive to the anti-corrosion of the grounding body; At the same time, it also contains corrosion inhibitors, inorganic corrosion inhibitors make the surface of the grounding body generate a passivation film, organic corrosion inhibitors adsorbed on the surface of the metal directional arrangement, the corrosion medium and the metal surface separation, play a role in protecting the metal.

In addition to the use of physical drag reducing agents, coke and graphite powder can also be directly used as a protective layer. It has been proved that the corrosion rate of the coke powder layer is only 1 10 of the non-coke powder layer when the steel electrode is placed in the same soil with and without coke powder layer. This method is mainly to improve the phase interface properties to achieve the purpose of corrosion inhibition and anti-corrosion.

It includes the surface coating of the grounding body and cathodic protection.

The protective layer of the grounding body is divided into two kinds: metal and non-metal, such as galvanized iron parts, but the galvanized layer is quickly corroded off, so at present, non-metallic coatings are mostly used, such as polyaniline conductive anticorrosive coatings, epoxy conductive anticorrosive coatings, polyurethane conductive anticorrosive coatings, etc. On the one hand, the anticorrosive coating is used as an intermediary substance between the steel grounding body and the soil or resistance reducing agent, and the contact effect between the two can be strengthened by its phase (strong adhesion and high viscosity of the coating); On the other hand, it plays an isolation role for the two, which is more conducive to inhibiting electrochemical corrosion. Under normal circumstances, the amount of paint is 2 3 of the total amount of grounding grid material, which can extend the life of the grounding body l times.

Protective coating and cathodic protection are often used in combination to achieve better protection. The uniform distribution of cathodic protection current is the key to poor protection, so the layout of the anode must meet the potential of complete protection everywhere in the protection piece.

The grounding network is an important device for the safe operation of lightning protection, so it is necessary to try to understand the nature of the soil before designing, the corrosion rate of the grounding body, adjust the anti-corrosion measures in time, and regularly detect the corrosion status of the ground network after operation to ensure the safe operation of lightning protection products.

In general, hot-dip galvanized flat steel is mainly used, but if a higher anti-corrosion period is required, it is necessary to use alloy composite materials with high anti-corrosion ability, mainly copper-clad steel, nanomaterials, zinc-based alloy diamond and zinc-based alloy copper materials, different materials can be selected according to different soil environments, but it should be noted that the process of material production, now the process of producing copper-clad steel, zinc-based alloy copper and zinc-based alloy copper mainly includes casing type, electroplating and horizontal continuous casting process, of which casing type is the worst, Because the binding degree between the materials using this process is relatively low, it is easy to react with galvanic cells, and the corrosion resistance is not good, and the horizontal continuous casting process is the best.

Grounding anti-corrosion? This problem is still difficult to solve. Nowadays, most of them are made of corrosion-resistant materials with good electrical conductivity!

Common galvanized angle iron, Xinbao steel, copper-clad steel, etc.

Paint with asphalt!! It can be prevented for ten or eight years, not a problem!!

with sacrificial anodes, or with anti-corrosion coatings.

How to reduce resistance in high soil resistivity areas can be selected by the following methods:

1. Replace the soil with low resistivity with black soil with low resistivity, clay and sandy clay. Generally, replace the soil within the length of the upper part of the grounding body 1 3 and the surrounding meters.

2. Deep burial If the resistivity of the deep soil at the grounding point is low, the burial depth of the grounding body can be appropriately increased. Deep burial can also disregard the increased resistivity of soil freezing and drying.

3. External grounding The grounding body is buried in a nearby place with low soil resistivity through metal leads.

4. Soil conservation Take measures to keep the soil at the grounding point moist for a long time.

5. Treat the frozen soil and add peat to the soil at the grounding point in winter to prevent the soil from freezing, or bury the grounding body under the building.

6. Replace the soil with a resistance reducer with high conductivity; The resistance reduction agent has the function of anti-corrosion and has high conductivity and water absorption, and the resistance reduction rate can reach more than 40%.

1. The grounding module can be embedded vertically or horizontally, and the embedding depth is generally meters.

2. When several modules are embedded in parallel, the module spacing should not be less than meters. If the conditions are not allowed, it can be appropriately reduced, and at the same time, the value of the module utilization coefficient when calculating the module usage should be reduced.

3. When the pole cores of the grounding module are connected in parallel with each other or with the ground wire, they must be welded. It is required to be welded with the same metal material to ensure the reliability of the connection. The welding length should not be less than 80mm, and virtual welding and missing welding are not allowed.

4. Welding slag should be removed at the welding place and coated with a layer of asphalt or anticorrosive paint to prevent core corrosion.

5. The pit backfill should use fine-grained soil as the filler, and the construction waste such as broken bricks should not be used as the backfill, and the backfill should be operated in layers, and after filling 30 cm of material, the appropriate amount of water should be added and tamped. Refill, water and tamper until flush with the surface.

6. After 72 hours of moisture absorption, measure the power frequency grounding resistance with a ground resistance meter. If the expected goal is not achieved, the reasons should be analyzed and remedial measures should be taken.

7. In cold regions, the module should be buried below the permafrost.

1. The module can be vertically embedded and horizontally embedded according to the site conditions, and the burial depth is generally the following (the burial depth is determined according to the site conditions).

The terminal crimping should be firm, and the screws should be tightened, and then the joints should be sealed with 1:2 cement mortar to avoid corrosion of the metal part of the electrode joints and affect the service life.

2. The distance between the module and the module is recommended to be about 4m, if the environmental conditions do not allow, it can be moderately relaxed or reduced;

3. When the grounding wire is connected with the sequential composite grounding module, the crimping terminal connection is adopted, and if the exothermic welding method is needed for connection, the company can purchase its special welding accessories;

4. Connect the soil with the composite grounding module, and the water is pounded into a paste to facilitate its close contact with each other to improve the effect of the unit;

5. The composite grounding module can be embedded horizontally and vertically, and its depth must reach constant humidity but not less, and the deeper the better;

There are a variety of methods for the construction of the grounding module, according to the topography of the site, the density of the dry humidity machine of the soil, the burial depth of the grounding module and the laying method of the grounding module are determined. Huifeng lightning protection production plan according to local conditions. In particular, when the soil is particularly dry, the depth of burial should be moderately deepened, and it is best to use vertical burial or radioactive burial.

Construction method of Hebei Huiheng lightning protection technology **** grounding module:

The low-resistance grounding module can be buried horizontally or vertically, and the burial depth is not less than meters, generally meters.

2.When several modules are embedded in parallel, the module spacing should not be less than meters.

3.When the pole cores of Huiheng low-resistance grounding module are connected in parallel with each other and connected to the ground grid, they must be welded. It is required to be welded with the same metal material to ensure the reliability of the connection. The welding length is not less than 100mm, and false welding and missing welding are not allowed.

4.The weld should be cleared at the weld and coated with a layer of asphalt or anti-corrosive vine to prevent core corrosion.

5.The backfill of the pit should be filled with granular soil, and broken bricks or construction waste should not be used as the backfill. When backfilling, it should be operated in layers, and after filling 30 cm, add an appropriate amount of water to tamp it.

Refill, add water and tamp until it is flush with the surface. When tamping, it should be noted that even if the module is in close contact with the soil, it will not damage the module itself.

6.Moisture absorption for 72 hours, with a ground resistance meter to measure the power frequency grounding resistance. If the expected target is not achieved, remedial measures should be analyzed and taken.

7.In cold regions, the module should be buried below the permafrost.