With the advancement of modernization, the equipment in railway stations is becoming increasingly advanced during the installation of lightning protection towers using graphite grounding. When lightning strikes occur, the discharge of lightning strikes induces electromagnetic pulse overvoltage and overcurrent, which damage the communication signal equipment and network communication equipment in the station through conduction and induction through the power supply system, communication signal transmission channel, grounding system, and building direct lightning protection system, causing huge losses and directly threatening the normal safe transportation and production of railways. The installation of lightning protection towers has emerged. Below, the editor of graphite grounding will introduce the details and issues that should be paid attention to during the installation of lightning protection towers:

1. Verify the equipotential welding and other grounding parts before installing the lightning protection tower. Regarding the parts that require equipotential welding and repeated grounding, such as equipment rooms, power distribution rooms, fire control rooms, air conditioning rooms, elevator rooms, water supply pipes, cooling towers, fans, etc., they should be noted in the construction diary for inspection and verification. For high-rise buildings above 45 meters, for every 3 floors upwards, a 25mm × 4mm flat steel should be laid inside the layout ring beam and welded to the down conductor to form a circular horizontal lightning protection belt, or at least 2 main reinforcement bars of the ring beam should be welded to form a pressure equalization ring. Metal pipes and objects laid horizontally inside the building should be welded to lightning protection grounding; Vertical metal pipes laid straight should be welded to lightning protection grounding at both the bottom and top. When constructing lightning protection equipotential grounding for glass curtain walls, it is important to ensure reliable welding on the main reinforcement of the columns. If it is a glass curtain wall added later, a specific lightning protection construction plan should be developed based on the construction area and various characteristics of the building. The lightning protection net on the roof and the lightning rods and metal objects on the top of the building should be welded together as a whole.

2. Before installing the lightning protection tower, check the welding quality of the leading point and cross reinforcement. For the grounding grid with column reinforcement as the lead line, construction personnel are required to mark the orientation of each column and the number of welded steel bars according to the axis, to prevent missing or wrong welding, and to prevent welding length and quality from not meeting the planning standards. Careful inspection should be conducted on the welding quality of the lead up point and the cross reinforcement, and the welding lead up line should be positioned and marked to prevent the main reinforcement from being welded incorrectly and causing grounding interruption errors. Especially in the layout transformation layer, due to the adjustment of column reinforcement, lightning protection down conductors are prone to welding errors and omissions when welding the main reinforcement inside the column, which requires repeated verification.

3. Conduct quality inspection according to standards. Lightning protection projects should be inspected for shading in a timely manner according to the progress of the project. Whether it is a natural grounding body or an artificial grounding body, as well as glass curtain walls, lightning protection grids, lightning rods, etc., grounding resistance value tests should be conducted in a timely manner after construction. Especially after the construction of the grounding body or grounding grid is completed, the grounding resistance value should be checked in a timely manner to ensure that it conforms to the planning rules. The grounding type of low-voltage distribution, the setting and equipment skills of SPD, pipeline layout and shielding methods should be consistent with the requirements of lightning protection planning. Check the planning, construction materials, and whether the equipment orientation, quantity, type standards, and skill parameters of SPD are consistent with the planning.

4. Strictly control the material quality before installing the lightning protection tower to ensure the welding quality. One is to verify the three certificates of materials, two is to check the material standards, and three is to check whether the galvanized materials used in the construction are in accordance with the planning and standard rules. The construction of lightning protection engineering mainly involves welding, and the quality of welding determines the quality of the project. When personnel with inadequate welding skills perform lightning protection and grounding operations, resulting in unqualified lightning protection engineering, it is necessary to strictly review the qualification level of professional lightning protection construction teams and the qualification certificates of construction personnel.

5. Check the grounding welding of the foundation. The foundation grounding welding is the top link in grounding construction. Regarding the welding of foundation ring beams or the welding of pile foundation steel bars and foundation steel bars, as well as the welding of foundation steel bars and column steel bars, it is necessary to strictly check each one according to the foundation diagram and connection address, especially to confirm whether the foundation steel bars at the expansion joint are connected by bridging. After the entire grounding grid is welded, a grounding resistance test should be conducted as soon as possible to confirm whether it meets the planning requirements. When the resistance value does not meet the planning requirements, the welding quality should be checked again or manual grounding equipment should be added according to the planning requirements.

The above is a sharing made by the editor of graphite grounding about the details and issues that should be paid attention to during the installation of lightning protection towers. We hope it can help those in need. If you want to learn more about related information, please continue to follow this website. New news will be pushed to everyone every day! Details and issues that should be noted