Lightning protection downlead connecting structure in assembly type building and construction method of lightning protection downlead connecting structure

Abstract

The invention relates to the technical field of prefabricated building construction, and particularly discloses a lightning protection downlead connecting structure in a prefabricated building and a construction method thereof.The lightning protection downlead connecting structure comprises a first clamping plate, a threaded rod is fixedly arranged on the first clamping plate, a nut is installed on the threaded rod in a threaded mode, a second clamping plate is slidably installed on the threaded rod, and a fixed clamping groove is formed in the first clamping plate; a movable clamping groove matched with the fixed clamping groove is formed in the second clamping plate, a rubber corrugated pipe is arranged in the fixed clamping groove, a connecting piece is installed between the corrugated pipe and the fixed clamping groove, metal plugging plates are fixedly arranged at the two ends of the corrugated pipe, a rubber elastic piece is arranged between the two plugging plates, a cavity is formed in the elastic piece, and conductive liquid is contained in the corrugated pipe. Through cooperation of the corrugated pipe, the elastic piece, the conductive liquid and the plugging plate, when the round steel downleads vibrate, the plugging plate is tightly attached to the end faces of the corresponding round steel downleads, current transmission between every two adjacent round steel downleads is not affected, the lightning discharge probability is reduced, and safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated building construction, and specifically discloses a lightning protection downlead connection structure and a construction method thereof in a prefabricated building. Background Art

[0002] With the rapid advancement of building industrialization, prefabricated buildings have been widely used in the field of engineering construction due to their significant advantages such as high construction efficiency, controllable quality, and environmental friendliness. As an important part of the building lightning protection system, the lightning protection downlead plays a key role in safely guiding the lightning current captured by the lightning arrester into the grounding device. In prefabricated buildings, due to the particularity of modular assembly of precast components, the reliability and durability of the downlead connection nodes directly determine the protection efficiency of the entire lightning protection system.

[0003] In a coastal highly corrosive environment, the connection method of the lightning protection downlead in prefabricated buildings mostly adopts the form of mechanical clamps; long-term monitoring data shows that under the combined action of wind vibration load, salt spray corrosion, and temperature difference stress, the fastening force of the clamp connection shows an obvious annual attenuation trend. Especially during typhoon passage, the high-frequency vibration of the structure will cause fretting wear at the connection interface, resulting in a sharp increase in contact resistance, and there are serious potential safety hazards for lightning current discharge. Summary of the Invention

[0004] According to the above deficiencies in the prior art, the present invention provides a lightning protection downlead connection structure and a construction method thereof in a prefabricated building to solve the problems in the prior art that the lightning protection downlead is connected by mechanical clamps, and under the combined action of wind vibration load, salt spray corrosion, and temperature difference stress, the fastening force of the clamp connection shows an obvious annual attenuation trend. Especially during typhoon passage, the high-frequency vibration of the structure will cause fretting wear at the connection interface, resulting in a sharp increase in contact resistance, and there are serious potential safety hazards for lightning current discharge.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: The lightning protection downlead connection structure in the prefabricated building includes a first clamping plate. A threaded rod is horizontally and fixedly installed on the side wall of the first clamping plate. A nut is threadedly installed on the threaded rod. A second clamping plate is slidably installed on the threaded rod. A fixed clamping groove is formed on the side wall of the first clamping plate, and a movable clamping groove cooperating with the fixed clamping groove is formed on the second clamping plate. A corrugated pipe made of rubber is arranged in the fixed clamping groove. A connecting piece is jointly installed between the corrugated pipe and the side wall of the fixed clamping groove. Sealing plates made of metal are fixedly installed at both ends of the corrugated pipe. An elastic member made of rubber is arranged between the two sealing plates. A cavity is formed in the elastic member, and a conductive liquid is filled in the corrugated pipe; A sealing ring is fixedly installed on the top wall of the first clamping plate. The sealing ring is circular, and an anti-wear mechanism for reducing the wear degree of the sealing ring is provided on the first clamping plate, and a fixing mechanism for fixing the sealing ring is provided on the second clamping plate.

[0006] Further, the anti-wear mechanism includes a cavity opened in the sealing ring, air holes communicated with the cavity are opened on the inner side wall of the sealing ring, and an air supply mechanism for supplying air to the cavity is provided on the corrugated pipe.

[0007] Further, the air supply mechanism includes an elastic air bag arranged in the cavity. The elastic air bag is made of elastic material, and the elastic coefficient of the elastic air bag is smaller than the elastic coefficient of the elastic member; An air inlet valve and an air outlet valve are respectively installed at the input end and the output end of the elastic air bag; An air suction pipe and an exhaust pipe are fixedly embedded in the first clamping plate in sequence. The bottom end of the air suction pipe is located on the bottom wall surface of the first clamping plate, the other end of the air suction pipe is communicated with the air inlet valve, the top end of the exhaust pipe is located on the top wall surface of the first clamping plate, and the other end of the exhaust pipe is communicated with the air outlet valve.

[0008] Further, a transverse pipe is fixedly installed on the side wall of the elastic air bag. The transverse pipe is made of metal, the transverse pipe penetrates through the side wall of the corrugated pipe, and the transverse pipe is fixedly connected with the corrugated pipe. The air inlet valve and the air outlet valve are located in the transverse pipe.

[0009] Further, ammonia gas is filled in the cavity.

[0010] Further, a partition plate is fixedly installed in the transverse pipe. The side wall of the partition plate is fixedly connected with the side wall of the elastic air bag, and the air inlet valve and the air outlet valve penetrate through the partition plate.

[0011] Further, the fixing mechanism includes a plug board fixedly installed on the bottom wall of the sealing ring, and a jack matched with the plug board is opened on the top wall of the second clamping plate.

[0012] Further, the longitudinal section of the sealing ring in the vertical direction is a regular frustum of a cone.

[0013] Further, a filter screen is fixedly installed on the bottom wall of the first clamping plate, and the filter screen covers the end face of the air suction pipe.

[0014] Further, a construction method for the lightning protection down-conductor connection structure in prefabricated buildings includes the following steps: S1. First, fixedly install the first clamping plate on the wall, and then insert the adjacent ends of two adjacent round steel down-conductors into the fixed card slots, so that the bottom end of the upper round steel down-conductor fits against the sealing plate at the top of the corrugated pipe, and the top end of the lower round steel down-conductor fits against the sealing plate at the bottom of the corrugated pipe, and the corrugated pipe and the elastic member are squeezed; S2. Fix and install the second clamping plate on the surface of the first clamping plate, and make the moving clamping groove cover the surface of the round steel downlead; S3. Press the sealing ring so that the plug board is inserted into the jack; S4. When the round steel downlead vibrates, the heat generated by friction is transferred to the elastic member, the temperature of the gas in the cavity rises, and under the action of air pressure, the elastic airbag is squeezed; S5. The elastic airbag exhausts air through the exhaust valve to supply air to the cavity. The gas in the cavity is discharged through the air holes. The gas discharged from the air holes passes through the gap between the round steel downlead and the sealing ring and is discharged to the outside.

[0015] The beneficial effects of the present invention are as follows: 1. Through the mutual cooperation of the corrugated pipe, the elastic member, the conductive liquid and the sealing plate, when the round steel downlead vibrates, the sealing plate can be closely attached to the end face of the corresponding round steel downlead, preventing the sealing plate from sliding on the end face of the corresponding round steel downlead, ensuring that the current transmission between adjacent round steel downleads is not affected, reducing the probability of lightning discharge, and improving safety.

[0016] 2. Through the mutual cooperation of the sealing ring, the elastic airbag, the elastic member and the cavity, when the contact surface between the round steel downlead and the first clamping plate and the second clamping plate vibrates and rubs against each other, the heat generated by friction is sequentially transferred to the sealing plate, the conductive liquid, and the elastic member in the form of heat exchange, so that the gas in the cavity expands due to heat, the elastic airbag is squeezed, and the gas in the elastic airbag flows into the cavity through the exhaust valve and the exhaust pipe. At this time, the air pressure in the cavity increases, and the cavity exhausts air outward through the air holes. The gas discharged from the air holes passes through the gaps between the fixed clamping groove, the moving clamping groove and the round steel downlead, so that the impurities falling into the gaps can be blown out, reducing the friction force on the round steel downlead during vibration, and playing a role in protecting the anti-corrosion coating on the surface of the round steel downlead. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the first clamping plate, the threaded rod, the nut, the corrugated pipe, the connecting member, the sealing ring and the plug board of the present invention; Figure 3 is a partial structural sectional view of the present invention; Figure 4 is Figure 3 an enlarged structural view of part A in Figure 5 is Figure 3 an enlarged structural view of part B in Figure 6 is Figure 3 an enlarged structural view of part C in Figure 7 This is a schematic structural diagram of the second clamping plate, sealing ring, insertion plate and insertion hole of the present invention.

[0018] In the figure: 1. First clamping plate; 2. Threaded rod; 3. Nut; 4. Second clamping plate; 5. Bellows; 6. Connecting piece; 7. Sealing plate; 8. Elastic member; 9. Cavity; 10. Sealing ring; 11. Cavity body; 12. Air hole; 13. Elastic airbag; 14. Intake valve; 15. Exhaust valve; 16. Suction pipe; 17. Horizontal pipe; 18. Partition plate; 19. Insertion plate; 20. Insertion hole; 21. Filter screen. Specific embodiments

[0019] The present invention will be specifically described and illustrated below with reference to the accompanying drawings.

[0020] Embodiment 1 As Figures 1-7 shown, the lightning protection downlead connection structure in the prefabricated building includes a first clamping plate 1. A threaded rod 2 is horizontally and fixedly installed on the side wall of the first clamping plate 1. A nut 3 is threadedly installed on the threaded rod 2. A second clamping plate 4 is slidably installed on the threaded rod 2. A fixed clamping groove is formed on the side wall of the first clamping plate 1, and a movable clamping groove cooperating with the fixed clamping groove is formed on the second clamping plate 4. A bellows 5 made of rubber is arranged in the fixed clamping groove. A connecting piece 6 is jointly installed between the bellows 5 and the side wall of the fixed clamping groove. Sealing plates 7 made of metal are fixedly installed at both ends of the bellows 5. An elastic member 8 made of rubber is arranged between the two sealing plates 7. A cavity 9 is formed in the elastic member 8, and a conductive liquid is filled in the bellows 5; The second clamping plate 4 is located between the nut 3 and the first clamping plate 1. A through hole is formed on the second clamping plate 4. The second clamping plate 4 is movably sleeved on the threaded rod 2 through the through hole. The ratio of the outer diameter of the nut 3 to the diameter of the through hole is 1.5:1. Therefore, when the nut 3 moves along the threaded rod 2, the second clamping plate 4 can be driven to move along the threaded rod 2; the fixed clamping groove penetrates the top wall and the bottom wall of the first clamping plate 1. When the second clamping plate 4 is attached to the side wall of the first clamping plate 1, the space formed by the combination of the fixed clamping groove and the movable clamping groove is cylindrical for cooperating with the round steel downlead. The conductive liquid is sodium chloride solution. Therefore, the conductive liquid in the bellows 5 and the sealing plates 7 form a conductor.

[0021] A sealing ring 10 is fixedly installed on the top wall of the first clamping plate 1. The sealing ring 10 is circular. An anti-wear mechanism for reducing the wear degree of the sealing ring 10 is arranged on the first clamping plate 1. A fixing mechanism for fixing the sealing ring 10 is arranged on the second clamping plate 4.

[0022] With the above settings, first use expansion bolts to firmly install the first clamping plate 1 on the surface of the building structure. Then, place the adjacent ends of two adjacent round steel downleads vertically in the fixed card slots, and make the round steel downlead above the first clamping plate 1 pass through the sealing ring 10. Also, make the bottom end of the upper round steel downlead fit with the sealing plate 7 at the top of the corrugated pipe 5, and make the top end of the lower round steel downlead fit with the sealing plate 7 at the bottom end of the corrugated pipe 5. At this time, the corrugated pipe 5 is squeezed, and at the same time, the elastic member 8 is squeezed and the cavity 9 is compressed. The space occupied by the elastic member 8 inside the corrugated pipe 5 decreases. Therefore, the conductive liquid still fills the internal space of the corrugated pipe 5.

[0023] Since the sealing plate 7 is made of metal structure and has good electrical conductivity, with the cooperation of the corrugated pipe 5 and the sealing plate 7, the two adjacent round steel downleads can be conducted.

[0024] Put the pipe through-hole on the second clamping plate 4 on the outer surface of the threaded rod 2, and then turn the nut 3 to make the nut 3 push the second clamping plate 4 towards the first clamping plate 1 until the first clamping plate 1 and the second clamping plate 4 are in close contact. During the movement of the second clamping plate 4, the moving card slot gradually covers the surfaces of the round steel downlead and the corrugated pipe 5, so that the two adjacent round steel downleads can be fixed by the first clamping plate 1 and the second clamping plate 4. At this time, under the action of the fixing mechanism, the bottom wall of the sealing ring 10 can be fixed to the second clamping plate 4, which can effectively prevent external dust from entering the gaps between the first clamping plate 1, the second clamping plate 4 and the round steel downlead.

[0025] Since the squeezed elastic member 8 has a tendency to recover, when the round steel downlead vibrates due to typhoon weather, under the action of the elastic member 8, the sealing plate 7 can always be in close contact with the end face of the round steel downlead. And the corrugated pipe 5 made of elastic material can shake in any direction. Therefore, when the round steel downlead vibrates, the sealing plate 7 can always be in close contact with the end face of the corresponding round steel downlead, and it is difficult for the sealing plate 7 to slide on the end face of the corresponding round steel downlead, preventing the situation where the resistance between the sealing plate 7 and the round steel downlead increases due to wear. And under the action of the sealing ring 10, it can prevent external impurities from diffusing to the surface of the gap at the contact part between the sealing plate 7 and the end face of the corresponding round steel downlead, playing a role in preventing wear between the sealing plate 7 and the end face of the corresponding round steel downlead.

[0026] Therefore, with the mutual cooperation of the corrugated pipe 5, the elastic member 8, the conductive liquid and the sealing plate 7, when the round steel downlead vibrates, the current transmission between the two adjacent round steel downleads is not affected, playing a role in reducing the probability of lightning discharge and improving safety.

[0027] Such as Figures 3-5As shown, the anti-wear mechanism includes a cavity 11 formed in the sealing ring 10. An air hole 12 communicating with the cavity 11 is formed in the inner side wall of the sealing ring 10. A gas supply mechanism for supplying gas to the cavity 11 is provided on the corrugated pipe 5.

[0028] The gas supply mechanism includes an elastic airbag 13 arranged in the cavity 9. The elastic airbag 13 is made of an elastic material, and the elastic coefficient of the elastic airbag 13 is smaller than that of the elastic member 8. An intake valve 14 and an exhaust valve 15 are respectively installed at the input end and the output end of the elastic airbag 13. An air suction pipe 16 and an exhaust pipe are sequentially and fixedly embedded in the first clamping plate 1. The bottom end of the air suction pipe 16 is located on the bottom wall surface of the first clamping plate 1. The other end of the air suction pipe 16 communicates with the intake valve 14. The top end of the exhaust pipe is located on the top wall surface of the first clamping plate 1. The other end of the exhaust pipe communicates with the exhaust valve 15.

[0029] A transverse pipe 17 is fixedly installed on the side wall of the elastic airbag 13. The transverse pipe 17 is made of metal. The transverse pipe 17 penetrates the side wall of the corrugated pipe 5 and is fixedly connected with the corrugated pipe 5. The intake valve 14 and the exhaust valve 15 are located in the transverse pipe 17.

[0030] Through the above settings, when the contact surfaces of the round steel downlead with the first clamping plate 1 and the second clamping plate 4 vibrate and rub against each other, the heat generated by the friction will be sequentially transferred to the sealing plate 7, the conductive liquid, and the elastic member 8 in the form of heat exchange, so that the gas in the cavity 9 expands due to heat. Since the elastic coefficient of the elastic airbag 13 is smaller than that of the elastic member 8, when the gas in the cavity 9 expands due to heat, the elastic airbag 13 will be squeezed. At this time, the gas in the elastic airbag 13 flows into the cavity 11 through the exhaust valve 15 and the exhaust pipe. At this time, the air pressure in the cavity 11 increases, and the cavity 11 exhausts air outward through the air hole 12. The gas discharged from the air hole 12 passes through the gap between the inner wall of the sealing ring 10 and the round steel downlead, so that the impurities falling into the gap can be blown out, preventing the impurities from entering the gap between the moving clamping groove, the fixed clamping groove and the round steel downlead, reducing the friction force received by the round steel downlead during vibration, reducing the wear degree of the round steel downlead, and playing a role in protecting the anti-corrosion coating on the outer surface of the round steel downlead.

[0031] And under the action of the transverse pipe 17, when the cavity 9 is in a high-pressure state, it can prevent the air suction pipe 16 and the exhaust pipe from being deformed by the air pressure, playing a role in ensuring that the elastic airbag 13 can exhaust gas normally.

[0032] As Figure 3 shown, ammonia gas is contained in the cavity 9.

[0033] Due to the relatively large coefficient of thermal expansion of ammonia gas, when the temperature of the elastic member 8 increases, the ammonia gas in the cavity 9 expands, further increasing the air pressure in the cavity 9, enhancing the tendency of the elastic member 8 to recover, that is, increasing the pressure of the elastic member 8 on the plugging plate 7, which plays a role in ensuring that the plugging plate 7 can remain in contact with the end face of the round steel down-conductor.

[0034] As Figure 5 shown, a partition plate 18 is fixedly installed in the horizontal pipe 17, the side wall of the partition plate 18 is fixedly connected to the side wall of the elastic airbag 13, and the air inlet valve 14 and the air outlet valve 15 penetrate through the partition plate 18.

[0035] Since the elastic airbag 13 is extruded by the high-pressure ammonia gas in the cavity 9, by setting the partition plate 18, it can prevent the deformed elastic airbag 13 from entering the horizontal pipe 17, which plays a role in ensuring that the elastic airbag 13 can continuously work.

[0036] As Figure 7 shown, the fixing mechanism includes a plug board 19 fixedly installed on the bottom wall of the sealing ring 10, and a jack 20 matching with the plug board 19 is opened on the top wall of the second clamping plate 4.

[0037] After the first clamping plate 1 and the second clamping plate 4 are fixed together, press the sealing ring 10 in the direction close to the bottom wall of the sealing ring 10, so as to be able to push the plug board 19 to be clamped in the jack 20, and the plug board 19 is fixed in the jack 20 through the friction force between the outer wall of the plug board 19 and the inner side wall of the jack 20, which plays a role in fixing the sealing ring 10, ensuring that the bottom wall of the sealing ring 10 can be closely attached to the second clamping plate 4, and preventing impurities from passing through the gap between the sealing ring 10 and the second clamping plate 4.

[0038] As Figures 2-3 shown, the longitudinal section of the sealing ring 10 in the vertical direction is a regular frustum of a cone.

[0039] Therefore, the outer wall of the sealing ring 10 is an inclined downward slope, which can enable the impurities falling on the surface of the sealing ring 10 to slide down along the outer wall of the sealing ring 10 in time, prevent the impurities from entering the gap between the round steel down-conductor and the sealing ring 10, and reduce the probability of wear of the coating on the outer surface of the round steel down-conductor.

[0040] As Figure 6 shown, a filter screen 21 is fixedly installed on the bottom wall of the first clamping plate 1, and the filter screen 21 covers the end face of the air suction pipe 16.

[0041] During the process of the elastic airbag 13 sucking air through the air suction pipe 16, the filter screen 21 can filter the impurities in the air flow, prevent the impurities in the air from being sucked into the elastic airbag 13, and play a role in ensuring that the air holes 12 discharge clean gas.

[0042] The construction method of the lightning protection downlead connection structure in the prefabricated building described above includes the following steps: S1. First, fix the first clamping plate 1 on the wall, then insert the adjacent ends of two adjacent round steel downleads into the fixed card slots, so that the bottom end of the upper round steel downlead fits against the sealing plate 7 at the top of the corrugated pipe 5, and the top end of the lower round steel downlead fits against the sealing plate 7 at the bottom of the corrugated pipe 5, and the corrugated pipe 5 and the elastic member 8 are squeezed; S2. Fix the second clamping plate 4 on the surface of the first clamping plate 1, and make the moving card slot cover the surface of the round steel downlead; S3. Press the sealing ring 10 to insert the insertion plate 19 into the insertion hole 20; S4. When the round steel downlead vibrates, the heat generated by friction is transferred to the elastic member 8, the temperature of the gas in the cavity 9 rises, and under the action of air pressure, the elastic airbag 13 is squeezed; S5. The elastic airbag 13 exhausts air through the exhaust valve 15 to supply air to the cavity 11, the gas in the cavity 11 is discharged through the air holes 12, and the gas discharged from the air holes 12 passes through the gap between the round steel downlead and the sealing ring 10 and is discharged to the outside.

Claims

1. A lightning protection down conductor connection structure in an assembled building, comprising a first clamping plate (1), a threaded rod (2) being fixedly mounted horizontally on the side wall of the first clamping plate (1), a nut (3) being threadedly mounted on the threaded rod (2), and a second clamping plate (4) being slidably mounted on the threaded rod (2), characterized in that: A fixed card slot is provided on the side wall of the first clamping plate (1), and a movable card slot cooperating with the fixed card slot is provided on the second clamping plate (4), a bellows (5) made of rubber is provided in the fixed card slot, a connecting piece (6) is installed between the bellows (5) and the side wall of the fixed card slot, a sealing plate (7) made of metal is fixedly installed at both ends of the bellows (5), an elastic piece (8) made of rubber is provided between the two sealing plates (7), a cavity (9) is provided in the elastic piece (8), and a conductive liquid is filled in the bellows (5); A sealing ring (10) is fixedly mounted on the top wall of the first clamping plate (1), the sealing ring (10) being in the shape of a circular ring, the first clamping plate (1) being provided with an anti-wear mechanism for reducing the degree of wear of the sealing ring (10), and the second clamping plate (4) being provided with a fixing mechanism for fixing the sealing ring (10).

2. The lightning protection down conductor connection structure in the prefabricated building according to claim 1, characterized in that: The anti-wear mechanism comprises a cavity (11) formed in a sealing ring (10); an air hole (12) communicating with the cavity (11) is formed on an inner wall of the sealing ring (10); and an air supply mechanism for supplying air to the cavity (11) is provided on the bellows (5).

3. The lightning protection down conductor connection structure in the prefabricated building according to claim 2, characterized in that: The air supply mechanism comprises an elastic airbag (13) arranged in the cavity (9); the elastic airbag (13) is made of an elastic material, and the elastic coefficient of the elastic airbag (13) is smaller than the elastic coefficient of the elastic member (8); An inlet valve (14) and an exhaust valve (15) are respectively installed at the input end and the output end of the elastic airbag (13); An intake pipe (16) and an exhaust pipe are fixedly embedded in the first clamping plate (1) in sequence, the bottom end of the intake pipe (16) is located on the bottom wall surface of the first clamping plate (1), the other end of the intake pipe (16) is connected to the intake valve (14), the top end of the exhaust pipe is located on the top wall surface of the first clamping plate (1), and the other end of the exhaust pipe is connected to the exhaust valve (15).

4. The lightning protection down conductor connection structure in the prefabricated building according to claim 3, characterized in that: A transverse tube (17) is fixedly mounted on the side wall of the elastic airbag (13); the transverse tube (17) is made of metal, penetrates the side wall of the bellows (5), and is fixedly connected to the bellows (5); the intake valve (14) and the exhaust valve (15) are located inside the transverse tube (17).

5. The lightning protection down conductor connection structure in the prefabricated building according to claim 1, characterized in that: The cavity (9) is filled with ammonia gas.

6. The lightning protection down conductor connection structure in the prefabricated building according to claim 4, characterized in that: A partition plate (18) is fixedly installed in the transverse tube (17), a side wall of the partition plate (18) is fixedly connected to a side wall of the elastic airbag (13), and the intake valve (14) and the exhaust valve (15) penetrate the partition plate (18).

7. The lightning protection down conductor connection structure in the prefabricated building according to claim 1, characterized in that: The fixing mechanism comprises an inserting plate (19) fixedly mounted on the bottom wall of the sealing ring (10), and a plug hole (20) matching with the inserting plate (19) is formed on the top wall of the second clamping plate (4).

8. The lightning protection down conductor connection structure in the prefabricated building according to claim 1, characterized in that: The longitudinal cross section of the sealing ring (10) in the vertical direction is a right truncated cone.

9. The lightning protection down conductor connection structure in the prefabricated building according to claim 1, characterized in that: A filter screen (21) is fixedly mounted on the bottom wall of the first clamping plate (1), and the filter screen (21) covers the end surface of the air intake pipe (16).

10. A construction method using the lightning protection down conductor connection structure in an assembled building according to any one of claims 1 to 9, characterized in that: The steps include: S1. First, the first clamping plate (1) is fixedly installed on the wall, and then the adjacent ends of two adjacent round steel down conductors are inserted into the fixed clamping grooves, so that the bottom end of the upper round steel down conductor fits with the sealing plate (7) at the top of the corrugated pipe (5), and the top end of the lower round steel down conductor fits with the sealing plate (7) at the bottom end of the corrugated pipe (5), and the corrugated pipe (5) and the elastic member (8) are squeezed; S2, the second clamping plate (4) is fixedly mounted on the surface of the first clamping plate (1), and the movable slot cover is arranged on the surface of the round steel down conductor; S3, pressing the sealing ring (10) to insert the plug plate (19) into the plug hole (20); S4. When the round steel down conductor vibrates, the heat generated by friction is transferred to the elastic member (8), the temperature of the gas in the cavity (9) increases, and the elastic airbag (13) is squeezed under the action of the gas pressure; S5. The elastic airbag (13) is exhausted through the exhaust valve (15) to supply air to the cavity (11). The gas in the cavity (11) is discharged through the air hole (12). The gas discharged from the air hole (12) passes through the gap between the round steel down conductor and the sealing ring (10) and is discharged to the outside.

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