Lightning rods are installed on flat roofs, walls, structures, chimneys and metal containers.

1. Rated Unit①Installation of lightning rods on flat roofs, walls and chimneys is measured by "root" or "group". ②The installation of independent lightning rods is measured by the "base", and the length, height and quantity are in accordance with the design rules. (2) Processing and production of lightning rods with "root" as a unit of measurement.

(3) Lightning rods are installed in groups of three and measured in "groups". 2、Lightning protection net installation

(1) The lightning protection mesh is laid according to the laying along the seam plate support and along the concrete block, and the engineering quantity is measured in "m". The formula for calculating engineering quantities is as follows: Lightning protection mesh length = length calculated according to the size shown in the diagram × (1+3.9%) 3.9% in the formula - for lightning protection mesh up to turn, avoid obstacles and overlap First-class added value of length. (2) The production of concrete blocks is measured in "blocks", and the number of support clamps is taken into account, usually 1 per meter and 1 per half meter in the corner(3) Pressure equalization ring installation is measured in "m" Measurement ① When flat steel and round steel are used separately as pressure equalization rings, the engineering value is calculated based on the length of the center line of the ring beam to be grounded for pressure equalization. pressure, and the project of "laying equalizing rings" is being carried out. ② When the main reinforcement in the ring beam of a building is used as a pressure equalization ring, the engineering value is based on the length of the center line of the ring beam, which must be grounded in the design for pressure equalization. When the main rib is used, it can be adjusted proportionally. (4) The main reinforcement of the column is welded to the annular beam, measured by "place"

The number of "points" connecting the main reinforcement of the column and the ring beam is calculated in accordance with the design standards. Each location is considered as two main reinforcements and two ring beam reinforcements, respectively welded and connected. If there are more than two welded main bars and ring bars, they can be adjusted proportionally.

2. Calculation of the installation number of down conductors (Construction) Laying the main reinforcement of the building structure, using metal elements for laying, etc. 1) Installation of down conductors is calculated in accordance with the height of the building on the construction drawing, measured in "extension meters", and in the norm includes the manufacture and termination of support clamps. The technical quantity of down conductor is calculated by the following formula:Length of down conductor=length calculated according to the size shown in the diagram×(1+3.9%)

2) Use the main reinforcement of the structure of the building (structure) as the down conductor installation: calculate the engineering quantity according to the following method.

When the main reinforcement in a column is used as the "bottom step", the quota is considered to be the welding of two main reinforcements measured in "m", and can be adjusted proportionally if more than two main reinforcements are used. 3) Manufacture and installation of disconnecting clamps is measured by "set". Calculate according to the number of disconnecting clamps installed according to the design requirements. Installation of disconnecting clamps in a surface manhole is calculated at the rate of one set per manhole.

(1) Ground electrode debugging is measured in "groups". Generally, three ground electrodes form a group, which is considered a debugging group. If the grounding resistance is not in accordance with the requirements, a test must be carried out after adding the grounding body, and another commissioning fee may be calculated. (2) Ground grid debugging measured by "system". The ground mesh is formed by connecting several ground electrodes, and sometimes a large ground mesh consists of several groups. Typically, a subnetwork may consist of 10-20 ground electrodes. In real work, if it is difficult to calculate according to the subnet, it can be used as a test unit for every 50m of network length, and the engineering quantity can also be calculated as a network if it is less than 50m. If the project has rules, it can be calculated according to the design quantity.