The detection of building lightning protection devices is very important, and lightning protection is essential in rainy days. Although the probability is small, it is possible to do well in protection, and every detail is crucial. The editor of Building Network will explain to everyone about the detection of building lightning protection devices

1. Detection object and detection location

1.1 Inspect the material, specifications, anti-corrosion measures, and corrosion of the lightning arrester on site, check whether the installation is vertical, whether the welding is firm, and whether there is any breakage or melting phenomenon.

. Check whether the connection between the lightning arrester and the down lead is reliable and the shunt situation. For single or multiple lightning rods, the rolling ball method should be used to determine their protection range and determine whether they can protect the building (structure) 1.1.1 Building lightning arrester: For the lightning protection network or lightning protection strip of buildings such as buildings, the diameter of round steel should be greater than or equal to 8mm, the cross-sectional area of flat steel should be greater than or equal to 48m ㎡, and the thickness should be greater than or equal to 4mm. During on-site testing, hard tools such as hammers or pliers should be used to strike the network strip appropriately. Check if there are any unreasonable laying areas such as welding and bending at right angles or less than right angles 1.1.2 The water tower lightning arrester requires the use of iron fences around the top of the water tower to protect the lightning arrester or the installation of a circular lightning strip edge, with one lightning rod installed in the center of the tower top. The condition of the lightning arrester can be observed through a high-power telescope The chimney lightning arrester uses lightning rods or circular lightning strips installed at the top of the chimney as protection, and multiple lightning rods should be connected into a closed loop using lightning strips 1.2 Check on-site whether the down lead is vertical, firm, and follows the shortest path principle; Check whether the diameter and cross-sectional area of the down lead material meet the specified requirements; Whether the layout of the down lead is reasonable, protective measures should be taken based on the distance between the entrance and exit of the building and the sidewalk, and the distance must be greater than or equal to 3.0m; Check for rust and poor contact on the disconnect card. It is advisable to set up a disconnection card at a distance of 1.8m from the ground; Check if non-metallic protective sleeves are installed below 1.5m above the ground; Check if the down lead is deformed and if there are right angles or sharp corners at the bend; Check for any breakage, mechanical damage, severe corrosion, etc. When the cross-sectional corrosion is greater than or equal to t/3, it should be replaced; Check whether the welding between the down lead, lightning arrester, and grounding device is firm and reliable, and whether there are cracks at the welding points; The layout of the down lead should include: whether it can cause lightning strike back and lightning electromagnetic pulse interference, whether there are other equipment leads nearby, whether there are cross or parallel electrical lines, and if so, measures should be taken; Whether the overvoltage of the down lead meets the requirements, whether it passes through temporary buildings, and whether it is convenient for inspection. For water towers with a height of less than or equal to 40.0m, an iron ladder can be used as the down lead; When the height is greater than 40.0m, an additional down lead should be installed or the main reinforcement inside the pillar should be used as the down lead. For chimneys with a height of less than or equal to 40.0m, iron escalators can be used as down conductors; When the height is greater than 40.0m, an additional down lead should be installed or the main steel bar inside the pillar or support should be used as the down lead The detection of grounding devices is mainly based on the actual measurement of the grounding power frequency resistance value. The grounding device mainly checks the installation position, depth, specifications, anti-corrosion, impact grounding resistance, etc., and should refer to the lightning protection design drawings in the infrastructure archives to see if the grounding device materials, specifications, layout, etc. are designed reasonably