How to do lightning protection in rural houses, and how to make lightning protection devices in rura

It is decided on a case-by-case basis. If the rural house is built in the middle of a house and the height is not prominent, there is no need to set up a separate direct lightning strike facility, and only need to install a lightning arrester or surge protector at the power inlet of the house to avoid lightning and high voltage along the power line into the house equipment.

If the house is higher than the surrounding houses, and the surrounding is empty, it is best to set up lightning protection devices, you can install steel bars with a diameter of 10 as lightning protection wires along the roof, and then set at least two down wires into the ground, bury the grounding electrode in the ground, bury the top of the buried depth from the ground meters, and the grounding resistance is not more than 10 ohms. The grounding electrode can be a 40x4 meter long angle bar, or a diameter of 15 meters long round steel, generally 3 are set on the three tips of the triangle in the ground, and the side of the triangle is 5 meters long. Connect with flat bars 40x4 or round bars with a diameter of at least 15.

Buildings with separate lightning protection devices still require lightning protection at the power inlet.

Installation of lightning belts (lightning rods).

1) Set up lightning protection belts along the roof to prevent direct lightning, and embed brackets along the eaves and ridge lines. 12 hot-dip galvanized round steel as lightning protection belt, and 60cm high 20 galvanized round steel lightning protection short needle is set in the appropriate position; The surface-mounted lightning protection belt (net) should be straight, the bend shall not be less than 900, and the bending radius shall not be less than 10 times the diameter of the garden steel.

2) Lightning protection belt: The lightning protection belt bracket is made of hot-dip galvanized flat steel-40x4

The height of the stent is 15cm when applied openly, and the spacing between each stent is 1m.

3) The grid spacing of the lightning protection belt shall not exceed 10 10m or 12 8m.

3) When the lightning protection belt is laid, the distance between the support parts should be evenly set, and the spacing of each straight line section is 1 meter, and the deviation is 20mm; At right angles and turns, it is called 500mm.

4) Metal doors and windows are connected with lightning protection devices. When processing the ordered metal doors and windows, 2 flat steel of 30cm should be thrown out as required, and if it exceeds 3m, it needs to be connected in 3 places for crimping or welding.

5) The lightning protection belt can be secretly laid in the plastering layer on the surface of the building, or directly use the structural reinforcement, and should be welded with the lightning protection net or the steel bar of the floor slab.

6) The main reinforcement or waist reinforcement in the structural ring beam is welded into one with the connecting steel head of about 20cm prepared in advance, and welded into a whole with the down wire in the column reinforcement.

7) Each point in the ring beam leads out the steel bar head, after welding, lay around with round steel (or flat steel), weld each point in the ring beam, and form an annular shape after being connected with the surrounding down leads. At the same time, a 30cm long 16mm galvanized round steel is thrown out at the metal doors and windows and metal railings on the outside of the building.

8) All metal objects with a roof higher than the lightning protection belt must be reliably connected with the lightning protection belt.

Zhengzhou Mine Lightning Protection provides a full range of information-based lightning protection system intelligent integration solutions and services, including lightning protection engineering consulting, lightning protection system design, lightning protection engineering construction, technical training, lightning risk assessment and analysis, and system engineering maintenance.

The professional practices of lightning protection for rural houses and buildings are as follows:

1. Lightning rods or lightning belts can be used to protect direct lightning strikes. Lightning rods can be installed directly on buildings. Down conductors can be routed along the roof and walls of buildings. The ground resistance of the grounding electrode is allowed to be 20 30 and the natural grounding body is used as much as possible.

2. The lightning rod (lightning receiver) does not have to use all metal conductors, but can use wooden rods, and lay wires 10cm higher than the wooden poles and with a cross-sectional area of 6 10cm2 along the rods. It is also possible to lay several wires in parallel, but their total cross-sectional area is not less than 50mm2

3. If there are chimneys, water towers, and big trees nearby, they can also be used as lightning rod supporters to save investment.

4. For houses with metal roofs, the roof can be grounded, that is, a down lead wire can be installed at a distance of not less than 15m along the perimeter of the roof, and then connected with the grounding electrode.

5. For houses with flammable materials as roofs, when installing lightning rods on the roof, the down conductors should avoid flammable materials to prevent sparks from catching fire when guiding lightning currents.

6. In order to prevent lightning from being introduced into the house through the low-voltage overhead line, the iron feet of the line insulator can be grounded (the introduction of the road and the iron feet of the porcelain bottle on the first electric pole to the house should be grounded.

If it is a house with a flammable material roof, and the insulated porcelain bottle at the entrance of the line is directly installed under the eaves and the lower edge of the roof is lowered, then do not connect the iron feet of the porcelain bottle at the introduction to the ground, but the iron feet of the porcelain bottle on the electric pole closest to the house can be grounded).

7. The material should be made of stainless steel pipe or galvanized steel pipe (minimum 32), or 50*50 galvanized angle iron can be buried more than 2 meters deep in the ground when digging the foundation, and the hard soil can be used with the help of the power of the excavator. There are 2 embedded groundings, generally at the 2 feet of the foundation, preferably diagonally.

If it is a rock formation, it should be at least one meter deep, but it should be hit 6 roots, every meter and into a rectangle, the periphery is covered with lime, the middle is covered with charcoal, and the top is welded and closed with 12 steel bars, and the solder joints should be firm. If the bottom layer is covered with steel mesh, the ground can be welded on the steel mesh, and the effect is better.

1. Choose the appropriate building site: lightning strikes often occur in some small areas (lightning strike areas), showing a certain selectivity, which has a certain relationship with geographical conditions and geological structure. In general, lakes and marshes, low-lying areas, areas with metal deposits and places with high water tables are more susceptible to lightning strikes.

At the junction of mountain slopes and paddy fields, at groundwater outlets, and in small areas where there is thick soil between rocks, that is, in areas where there is a large difference in resistivity, lightning activity is also more frequent. It is best to do some simple research when choosing a house base, and if you find that a certain area has a history of multiple lightning strikes, you can avoid these places for new housing.

2. The shape of the house should not be sharp: rural houses are generally scattered, and the shape of the house should not have particularly prominent parts (such as spires), nor should it be built too high, and building a house in isolation in the wilderness is not conducive to lightning protection. If it is necessary to construct protruding buildings (including chimneys), lightning rods can be considered for protection.

However, the protection range, materials and grounding devices of lightning rods have strict technical requirements, do not erect iron parts on the roof and chimney at will, and artificially create the tip of lightning strikes, the result is not only not to avoid lightning, but to play the role of lightning.

3 The structure of the house should be able to block the wind: there is a kind of ball mine in the lightning, it flashes purple or gray-red light, floats in the air or rolls along the ground, it may enter the house with the wind, touch objects and people, and sometimes produce **. Therefore, the windows of the house should be equipped with glass windows or simple dark windows, which can be closed when there is a thunderstorm.

It is best to seal the gable and side walls to the top, and try to leave as few ventilation ducts as possible that cannot be closed.

4. The layout of the wires should be reasonable: the rural low-voltage wires and broadcasting lines have long lines and poor shielding, and it is more likely to be directly struck by lightning or induced overvoltage. Therefore, indoor wiring should be noted, the lamp head, socket position should not be too close to the head of the bed, during the thunderstorm season, the plug of radio, TV and other electrical appliances can be taken away when not in use, and it is best to turn off the radio, TV and cable broadcast speaker when flashing thunder.

Conditionally, where the road is introduced into the building, the porcelain bottle iron foot is grounded, and the grounding resistance is not less than 30 ohms. It is best to install a knife switch on the antenna of the radio and TV, which can be disconnected when not in use or when lightning flashes.

Rural buildings are generally called self-built houses, with my experience in the construction of self-built houses many times, lightning protection can not be omitted links, the specific operation method I will introduce to you according to the following steps.

1. When doing the foundation, we need to purchase lightning protection galvanized steel sheets, which can be purchased in general ** steel places (galvanized pipe shops). The quantity you buy is twice the height of your building plus the total length of the building (e.g. 12 meters by 2 times the perimeter of the foundation).

2. Let the foundation reinforcement be welded to the conductive sheet you purchased, while reserved on the diagonal structural columns.

3. With the construction of the house, the conductive sheet is constantly welded to the roof of the daughter wall.

4. When the project is completed, it can be welded with a conductive sheet and a reserved conductive sheet, and fixed at a position of 10 cm on the parapet wall. In this way, the lightning protection treatment of the self-built house is completed.

Rural houses can install lightning rods on the roof of the building, the steps are as follows:

1. Weld a circle of 12 steel bars around the roof.

2. Then connect a steel bar and pull it to the ground.

3. Dig a pit two meters in the ground and bury the pulled down steel bar in the ground.

4. The lightning rod is connected with the earth to achieve the effect of lightning protection.

A lightning rod, also known as a lightning rod, is a device used to protect buildings, tall trees, etc. from lightning strikes. A flash receiver is installed at the top of the protected object and connected to the underground drainage network with a wire that meets the specifications. The lightning rod specification must meet the GB standard, and the lightning rod height specification required for each lightning protection category is different.

Lightning protection grounding is divided into two concepts, one is lightning protection, to prevent damage caused by lightning strikes; The second is electrostatic grounding to prevent static electricity from causing harm to trouser cracking.

One. The lightning protection of the factory is divided into the overall structure lightning protection, that is, the lightning protection of the main plant, and the main foundation is grounded electrode and grounding belt to form a grounding network, and the grounding resistance is less than 10 ohms. Then it is connected with the main body of the steel bar or steel structure of the main plant.

The cement concrete roof is connected to the lightning belt or lightning rod, and the ground outside the wall must also have a grounding test point, and the steel structure should be directly led to the roof with galvanized flat iron.

Two. The grounding of the power supply system is divided into protective grounding and working point grounding, and the protective grounding is the grounding of the shell of the live equipment. The grounding of the working point refers to the grounding of the zero line, and the grounding network is the same as the lightning protection grounding method, and the grounding resistance is less than 4 ohms.

If the requirements are not met, the grounding electrode should be added, and if the conditions are not good, electrolyte should be added and/or the soil should be replaced. The working grounding and protective grounding are independently led out in the distribution room, and the system can be one.

Lightning protection is divided into two concepts, one is lightning protection, to prevent damage caused by lightning strikes; The second is electrostatic grounding to prevent static electricity from harming. With the increasing application of cathodic protection in storage tanks, its protection effect has attracted more and more attention, and the contradiction between lightning protection and grounding specifications and cathodic protection specifications has become more and more prominent.