How to install lightning rods and ancient trees

Lightning protection requirements for ancient and famous trees

5. 1 The lightning protection of ancient and famous trees should adhere to the principles of prevention first, safety first, scientific and reasonable, and overall consideration.

5.2 The lightning protection of ancient and famous trees should be evaluated and demonstrated according to the method specified in GB/T 2 17 14.2.

5.3 The lightning protection design of ancient and famous trees should take corresponding lightning protection measures according to environmental conditions, geographical location, lightning activity law and the characteristics of protected objects.

5.4 The shape of lightning protection device should be coordinated with ancient and famous trees and natural landscape, and the color should match the surrounding environment.

5.5 The lightning protection of ancient and famous trees should be combined with the protection of surrounding scenic buildings and tourist activity areas.

5.6 Lightning protection of tall trees in rural areas can also be implemented with reference to this standard.

5.7 Ancient and famous trees grow in strong minefields or lightning-prone areas in crowded places, and corresponding lightning protection devices should be set according to the requirements of this standard.

5.8 When ancient and famous trees are protected by direct lightning, the factors that increase the growth of trees should be fully considered, and the protection scope of lightning protection devices should have protection margin.

5.9 Metal objects such as communication cables and low-voltage overhead lines shall not be hung on ancient and famous trees.

5. 10 In the process of design and construction, the differences between trees and wood structures should be considered, and the root range of trees should be considered at the same time, so as to reduce the damage of lightning current discharge to ancient and famous trees.

5. 1 1 The lightning protection device for ancient and famous trees should fully consider the harm caused by lightning discharge to surrounding people and facilities. See appendix b for the form of injury.

5. 12 When there are a large number of metal components, metal equipment, overhead power lines and communication lines near ancient and famous trees, other hazards caused by lightning strike should be considered.

5. 13 When the lightning protection category of ancient and famous trees is determined, if the protection level of ancient and famous trees is different, the ancient and famous trees with the highest level shall prevail.

5. 14 if the ancient and famous trees are lower than the surrounding tall buildings (structures) and are within the protection scope according to the rolling ball method in GB 50057, it is not necessary to install lightning protection devices on the ancient and famous trees alone.

5. 15 ancient and famous trees growing in the following areas shall take necessary lightning protection measures according to the lightning protection requirements of this standard:

A) Old and famous trees growing in cities, villages, tourist attractions, scenic spots, temples and other crowded places;

B) Old and famous trees near rivers, lakes and ponds;

C) Old and famous trees in relatively humid places around the growing place;

D) Ancient and famous trees in areas with frequent lightning activities;

E) Ancient and famous trees in lightning-struck areas;

F) Old and famous trees, especially tall trees are in a prominent position in the wilderness.

6 lightning protection device

6. 1 lightning receptor

6. 1. 1 Selection of lightning receptor

6. 1. 1. 1 The choice of lightning arrester shall meet the technical requirements of lightning protection and will not affect the landscape of ancient and famous trees. The following arresters can be selected:

A) independence

Lightning rod and lightning tower;

(2) Lightning rods and towers installed on buildings near ancient and famous trees;

C) Lightning rod installed on the trunk;

D) For the independently set lightning rod, galvanized steel strand should be used as the lightning rod, and its cross-sectional area should not be less than 50 mm2.

6. 1. 1.2 In the design of lightning rod and tower, the mechanical strength, corrosion resistance and other factors should be considered in the selection of materials and geometric dimensions.

6. 1. 1.3 For lightning arresters installed in trees, it is recommended to use rod lightning rods, and the relevant parameters should meet the requirements in Table 1.

Table 1 lightning rod related parameters

Lightning current capacity, kA 150 200

Lightning arrester, mm φ 20× 700×1φ 20× 450×1,φ 15× 350× 3.

Needle height, mm 2700+2000X.

(X=0, 1, 2, 3 is the number of protruding rod segments) 2700+2000X.

(X=0, 1, 2, 3, which is the number of protruding rod segments)

Net weight, kg 5+4.4X

(X=0, 1, 2, 3, which is the number of protruding rod segments) 7+4.4x.

(X=0, 1, 2, 3, which is the number of protruding rod segments)

Wind resistance, m/s ≥25

(For details, please refer to the website of Dikai Lightning Protection Company, which has the Technical Specification for Lightning Protection of Ancient and Famous Trees. )