Rail transit station building grounding electrode protection device and method

Abstract

The invention discloses a rail transit station building grounding electrode protection device and method, and belongs to the technical field of grounding electrode protection devices. Comprising a copper pipe, an insulating jacket, a wiring sealing seat, a protective core body and a cable joint, a threaded structure is arranged on the outer wall of the copper pipe, and a grounding electrode movably penetrates through the axis of the copper pipe; the inner wall of the insulating outer sleeve is of a convex structure, and the large-diameter end of the inner wall of the insulating outer sleeve is connected with the copper pipe in a screwed mode. A disc seat is integrally manufactured on the top of the insulating jacket, and a plurality of reinforcing edges are integrally manufactured on the insulating jacket at the bottom of the disc seat; a plurality of sealing rings are arranged at the top of the disc seat, and a plurality of screw holes are formed in the disc seat between the sealing rings at intervals; according to the rail transit station building grounding electrode protection device and method, the grounding electrode protection process is simpler, it can be guaranteed that the grounding electrode makes good contact with the grounding position, the grounding effect is guaranteed, and the phenomenon of electric sparks caused by poor local contact can be avoided.

Description

Technical Field

[0001] The present invention specifically relates to a grounding electrode protection device and method for a rail transit station building, and belongs to the technical field of grounding electrode protection devices. Background Art

[0002] There is a grounding network at the bottom of the rail transit station, which consists of a copper busbar and a grounding electrode lead-out wire. The grounding electrode lead-out wire is mostly protected by a 150mm galvanized steel pipe lined with protective material. Each station sets the number of grounding electrode lead-out wires according to the passenger flow scale, generally ranging from 12 to 24. The galvanized steel pipe of the grounding electrode lead-out wire is about 100mm away from the actual ground, and the copper busbar is exposed about 10mm from the galvanized steel pipe. It takes a long time from the installation of the grounding electrode lead-out wire to the wiring and use of the equipment. During this period, there are many professional process conversion process links. If the grounding copper busbar is damaged, it is very difficult to repair it. On the other hand, after the equipment is professionally wired to the copper busbar, the stress on the copper busbar causes deformation, which will cause disconnection after a long time. Moreover, the copper busbar and the cable are exposed in the humid underground environment and are very easy to rust. For this reason, China Patent Publication No.: CN116470335A discloses a rail The grounding electrode protection device of a transportation station building includes a fixed chassis, a shaft sleeve and a shaft sleeve cover; the copper busbar is protected by injecting sealant into the shaft sleeve, and the sealant can be cut later, and the cable and the copper busbar are connected and then re-injected with sealant. The arc-shaped cable top support can protect the cable from wear; but the structure needs to go through the process of injecting and cutting and stripping the sealant, which is easy to damage the grounding electrode, and the operation is relatively cumbersome. In addition, the process of cutting and stripping the sealant, the process of opening the grounding electrode, and the process of connecting the cable and the grounding electrode can easily cause the grounding electrode to separate from the grounding position; especially after the sealant is injected, it is easy to cause the grounding electrode to be completely isolated from the grounding position, causing the grounding electrode to lose its grounding function; in addition, after the grounding electrode and the cable are connected, the traction and swing of the cable can easily destroy the electrical contact stability of the connection position. When a large current passes through the connection position, it is easy to generate high heat locally, causing the sealant to age, and even local burning. Summary of the Invention

[0003] To solve the above problems, the present invention proposes a grounding electrode protection device and method for rail transit station buildings, which simplifies the grounding electrode protection process, ensures good contact between the grounding electrode and the grounding position, ensures the grounding effect, and avoids the occurrence of local poor contact and sparks.

[0004] The rail transit station building grounding electrode protection device of the present invention comprises: A copper tube, wherein the outer wall of the copper tube is provided with a threaded structure, and a grounding electrode is movably penetrated through the axis of the copper tube; An insulating jacket, wherein the inner wall of the insulating jacket is a convex structure, and the large-diameter end of the inner wall of the insulating jacket is screwed to the copper tube; the top of the insulating jacket is integrally formed with a disc seat, and the insulating jacket is integrally formed with multiple reinforcing ribs at the bottom of the disc seat; the top of the disc seat is provided with multiple sealing rings, and the disc seat is provided with multiple screw holes spaced between the sealing rings; the reinforcing ribs can increase the casting stability of the concrete foundation and the insulating jacket; The copper tube and the reinforcement rib are cast inside the concrete foundation; A wiring closure seat, comprising an I-shaped seat, the top of which is integrally formed with a wiring tube, the upper portion of the inner wall of which is provided with a threaded groove, and the inner wall of which is integrally formed with a V-shaped sealing groove at the bottom of the threaded groove; the I-shaped seat is pressed onto the top surface of the insulating jacket via a sealing ring, and the I-shaped seat is provided with a plurality of bolts that are tightened into the screw holes; the top of the grounding electrode is provided on the inner side of the I-shaped seat; A protective core body, the protective core body includes a resistance reducing agent filler poured and filled on the inner wall of the copper tube, pre-cast cable cold sealing adhesive is poured from the middle of the inner side of the insulating jacket to the top surface of the resistance reducing agent filler; cast-in-place cable cold sealing adhesive is poured from the lower inner side of the wiring closed seat to the top surface of the pre-cast cable cold sealing adhesive; transformer oil is poured from the lower part of the sealing groove to the top surface of the cast-in-place cable cold sealing adhesive of the wiring tube; the solidified resistance reducing agent filler can assist in stabilizing the grounding and enhance the stability of the grounding electrode and the grounding position; then, the resistance reducing agent filler is protected by the pre-cast cable cold sealing adhesive, and the pouring amount of the cast-in-place cable cold sealing adhesive can be reduced. Since the pre-cast cable cold sealing adhesive is poured in an open manner, the pouring efficiency of the cable cold sealing adhesive can be improved. Finally, the cable core and the grounding electrode exposed on the inner side of the wiring closed seat can be isolated from oxygen by the transformer oil.

[0005] A cable connector includes a sealing plug and a screw column that are movably engaged with the cable; the screw column is screwed into the threaded groove and tightens the sealing plug against the sealing groove. The cable passes through the screw column and the sealing plug. The continuous screwing of the screw column causes the sealing plug to elastically deform, thereby tightening the cable and preventing external moisture from entering.

[0006] Furthermore, a clamping ring is provided on the top of the sealing plug, and the bottom surface of the clamping ring is cast on the inner side of the sealing plug. When it is necessary to regularly add oil to the wiring closure seat, the screw column is unscrewed and the handle is inserted into the clamping ring. The sealing plug is pulled out of the wiring closure seat by the handle, and then transformer oil is injected into the wiring closure seat. After the oil filling is completed, the screw column and the sealing plug are re-sealed on the top of the wiring closure seat.

[0007] Furthermore, it also includes a head, which is screwed to the threaded groove before the cable and the grounding electrode are connected; the head is used to seal the top of the wiring closure seat to prevent external water vapor from penetrating into the inside of the wiring closure seat.

[0008] Furthermore, a sealing nozzle is provided on the top surface of the head, and the sealing nozzle is an inflation nozzle or an oil filling bolt; a sealing jacket is provided on the outside of the sealing nozzle of the head; when oil filling is required, the oil filling bolt is opened and transformer oil is injected. After the oil filling is completed, the oil filling bolt is used to seal it; and pressurized gas can also be injected into the wiring closure seat through the inflation nozzle through an inflation device to prevent external water vapor from penetrating.

[0009] Furthermore, the connection between the cable and the grounding electrode is immersed in transformer oil. By immersing the connection between the cable and the grounding electrode in transformer oil, the cable core and the grounding electrode exposed inside the wiring enclosure can be isolated from oxygen.

[0010] Furthermore, a transparent oil filling pipe is fixed to the upper part of the outer wall of the wiring closed seat, the oil filling pipe is connected to the inner wall of the wiring closed seat, and an oil filling plug is screwed on the top of the oil filling pipe; the internal oil level can be observed through the oil filling pipe during the grounding inspection. When the oil level drops, it can be discovered in time that the oil level is too low, or there is poor contact between the grounding electrode and the cable connection point, and the oil filling plug can be opened to regularly replenish transformer oil to the inside of the wiring closed seat.

[0011] Furthermore, the bottom of the copper tube is integrally formed with an expanded diameter portion, which can increase the diameter of the bottom of the copper tube, and by filling the expanded diameter portion with a resistance reducing agent filler, the support strength of the grounding electrode structure can be increased, and the grounding stability of the grounding electrode can be improved.

[0012] Furthermore, a plurality of flexible graphene grounding bodies are fixed to the outer bottom of the expanded diameter portion by bolts, and the flexible graphene grounding bodies can be spread around the grounding grid, thereby achieving good contact between the grounding electrode, copper tube, flexible graphene grounding body and the surrounding grounding position, further improving the grounding stability.

[0013] Furthermore, the drag reducer filler is a salt drag reducer, a metal oxide drag reducer, a conductive polymer or a composite drag reducer; salt drag reducers such as sodium chloride and calcium chloride are dissolved in conductive cement or other carriers to increase the overall ion concentration, thereby reducing the peripheral resistivity; metal oxide drag reducers use zinc oxide and magnesium oxide, etc., which have high conductivity and reduce the peripheral resistance; composite drag reducers can be made of finished drag reducers, such as fine graphite, bentonite, curing agent, lubricant and conductive cement.

[0014] Furthermore, the top of the wiring closing seat is integrally formed with an adjustment disk, and a plurality of arc-shaped adjustment holes are opened on the adjustment disk. The top surface of the adjustment disk is pressed with an adjustment seat, and the middle part of the adjustment seat is integrally formed with an inclination tube; the cable is led out from the inclination tube; the adjustment seat passes through a bolt, and the bolt passes through the arc-shaped adjustment hole and is locked by a nut; during installation, loosen the bolt and nut, and then adjust the inclination tube to the same direction according to the cable routing direction. After the adjustment is completed, tighten the bolt and nut to lock the position of the adjustment disk, so that the cable can smoothly transition to the routing direction to avoid bending.

[0015] A rail transit station building grounding electrode protection method, using a rail transit station building grounding electrode protection device, the method is specifically as follows: The first step is to pre-embed the grounding electrode. The copper pipe and the grounding electrode are laid out inside the casting mold. Next, the bottom of the grounding electrode is fixed to the grounding end, and the copper pipe is fixed to the steel bars inside the casting mold. Next, the copper pipe and the insulating jacket are cast and pre-embedded inside the concrete. When the insulating jacket is cast, the copper pipe and the steel bars are welded together, or the copper pipe and the insulating jacket are supported by internal formwork, and finally poured into the concrete. Before casting, the distance between the ends of the copper pipe and the insulating jacket can be adjusted by rotating the copper pipe and the insulating jacket so that the top surface of the insulating jacket is at the same height. The second step is to load the protective core once, wait for the concrete to solidify, inject the resistance reducing agent filler into the copper tube, and tamp the resistance reducing agent filler. After the resistance reducing agent filler solidifies, pour the cable cold sealing compound into the inner side of the insulating jacket. After the resistance reducing agent filler solidifies, it provides a stable support system for the root of the grounding electrode. That is, the solidified resistance reducing agent filler can fill the copper tube and the grounding point to avoid peeling between the grounding electrode and the grounding point. At the same time, the conductive property of the resistance reducing agent can increase the grounding stability of the cable. The third step is to install the wiring closure seat. After the cable cold seal compound solidifies, press the sealing ring inside the sealing ring. Then, press the wiring closure seat onto the top of the insulating jacket and tighten it with bolts. Then, seal the top of the wiring closure seat and pour transformer oil or compressed air into the inside of the wiring closure seat, waiting for the cable to be installed. Before the cable is installed, the transformer oil or compressed air can isolate the air around the grounding electrode. The sealing ring and the cable cold seal compound can form a sealed space inside the wiring closure seat, which can protect the grounding electrode and prevent it from rusting. The fourth step is cable assembly. First, release the compressed air inside the wiring enclosure or extract the transformer oil. Then, separate the wiring enclosure and the insulating jacket, and pass the cables through the cable connector and wiring enclosure in sequence. Next, electrically connect the cables to the grounding electrode, and reassemble the wiring enclosure and the insulating jacket. The fifth step is to load the secondary protective core and inject the cable cold sealing compound into the wiring closure seat through the gap between the sealing groove and the cable for the second time. After the cable cold sealing compound is solidified, inject transformer oil into the wiring closure seat through the gap between the sealing groove and the cable again. Then, continue to rotate the screw column downward along the threaded groove until the screw column is pressed against the top of the sealing plug. The sealing plug is compressed and deformed by the sealing groove, and the sealing plug holds the cable tightly while pressurizing the transformer oil so that the transformer oil completely wraps around the cable and the grounding electrode connection.

[0016] Furthermore, after the secondary protective core is loaded, transformer oil is regularly added to the wiring enclosure to avoid the grounding electrode and the cable connection position being exposed to the air. Regular addition of transformer oil can ensure that the transformer oil always immerses the grounding electrode and the cable connection position, thereby achieving insulation, cooling and protection around the connection position, isolating oxygen, and avoiding oxidation of the grounding electrode, which leads to aging of the cable core and the grounding electrode at the connection position.

[0017] Compared with the prior art, the rail transit station building grounding electrode protection device and method of the present invention do not require cutting and stripping of the sealant, can protect the grounding electrode, and the grounding electrode protection construction process is simpler. During construction, a protective core is used for protection. The protective core uses a resistance-reducing agent filler and a pre-cast cable cold-sealing adhesive to solidify the root of the grounding electrode, ensuring stable electrical contact between the grounding electrode and the grounding position, ensuring the grounding effect, and after the cable is introduced, secondary protection is performed by the cast-in-place cable cold-sealing adhesive to enhance the sealing between the insulating jacket and the wiring closure seat; finally, by pressurizing the transformer oil at the grounding electrode and cable connection position, local poor contact and spark generation can be avoided; and the oil consumption in the oil filling pipe can be used to inspect and determine whether the grounding electrode and cable connection position are in reliable contact, so that the high temperature phenomenon caused by poor contact at the connection position can be discovered in time; when the oil consumption is abnormal, the electrical contact stability of the grounding electrode and the cable can be tested, and the transformer oil can be replenished in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional structure diagram of the rail transit station building grounding electrode protection device of the present invention.

[0019] Figure 2 This is a schematic diagram of the installation structure of the copper tube, insulating jacket, wiring closure seat and head of the present invention.

[0020] Figure 3 This is a schematic diagram of the wiring closure and head installation structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the installation structure of the copper tube, insulating jacket, wiring closure, head and oil filling pipe of the present invention.

[0022] Figure 5 This is a schematic cross-sectional structural diagram of a rail transit station building grounding electrode protection device of the present invention, in which the bottom of the copper tube is an expanded diameter portion.

[0023] Figure 6 This is a schematic diagram of the installation structure of the insulating jacket, copper tube, expanded diameter portion and flexible graphene grounding body of the present invention.

[0024] Figure 7 This is a schematic structural diagram of the copper tube, insulating jacket, wiring closure and cable connector of the present invention before assembly.

[0025] Figure 8 This is a schematic diagram of the installation structure of the copper tube, insulating jacket, wiring closure, adjustment plate and cable connector of the present invention.

[0026] Figure 9 This is a schematic diagram of the installation structure of the copper tube, insulating jacket, wiring closure, position adjustment plate, direction adjustment seat and inclination tube of the present invention.

[0027] Figure numerals: 1. copper tube, 2. grounding electrode, 3. insulating jacket, 4. disc seat, 5. reinforcing rib, 6. sealing ring, 7. concrete foundation, 8. I-shaped seat, 9. wiring tube, 10. resistance reducing agent filler, 11. cold sealing adhesive for precast cables, 12. cold sealing adhesive for cast-in-place cables, 13. transformer oil, 14. sealing plug, 15. screw column, 16. cable, 17. clamping ring, 18. head, 19. sealing nozzle, 20. sealing jacket, 21. oil filling pipe, 22. oil filling plug, 23. diameter expansion part, 24. flexible graphene grounding body, 25. adjustment disk, 26. arc-shaped adjustment hole, 27. direction adjustment seat, 28. inclination tube. DETAILED DESCRIPTION

[0028] Example 1: like Figures 1 to 9 The rail transit station building grounding electrode protection device shown includes: A copper tube 1, wherein the outer wall of the copper tube 1 is provided with a threaded structure, and a grounding electrode 2 is movably passed through the axis of the copper tube 1; An insulating jacket 3 having a convex inner wall, the large-diameter end of which is screwed to the copper tube 1; a disc seat 4 integrally formed on the top of the insulating jacket 3, and multiple reinforcing ribs 5 integrally formed on the bottom of the disc seat 4; multiple sealing rings 6 are provided on the top of the disc seat 4, and multiple screw holes are spaced between the disc seat 4 and the sealing rings 6; the reinforcing ribs 5 can increase the casting stability of the concrete foundation 7 and the insulating jacket 3; The copper tube 1 and the reinforcing rib 5 are cast inside the concrete foundation 7; The wiring closure seat includes an I-shaped seat 8, the top of which is integrally formed with a wiring tube 9, the upper portion of the inner wall of which is provided with a threaded groove, and the inner wall of which is integrally formed with a V-shaped sealing groove at the bottom of the threaded groove; the I-shaped seat 8 is pressed onto the top surface of the insulating jacket 3 through a sealing ring, and the I-shaped seat 8 is provided with a plurality of bolts that are tightened into the screw holes; the top of the grounding electrode 2 is provided on the inner side of the I-shaped seat 8; A protective core, the protective core includes a resistance reducing agent filler 10 poured and filled on the inner wall of the copper tube 1, and a pre-cast cable cold-sealing adhesive 11 is poured from the middle inner side of the insulating jacket 3 to the top surface of the resistance reducing agent filler 10; a cast-in-place cable cold-sealing adhesive 12 is poured from the lower inner side of the wiring closed seat to the top surface of the pre-cast cable cold-sealing adhesive 11; the wiring tube 9 is poured with transformer oil 13 from the lower part of the sealing groove to the top surface of the cast-in-place cable cold-sealing adhesive 12; the solidified resistance reducing agent filler 10 can assist in stabilizing the grounding and enhance the stability of the grounding electrode 2 and the grounding position; then, the resistance reducing agent filler 10 is protected by the pre-cast cable cold-sealing adhesive 11, and the pouring amount of the cast-in-place cable cold-sealing adhesive 12 can be reduced. Since the pre-cast cable cold-sealing adhesive 11 is poured in an open manner, the pouring efficiency of the cable cold-sealing adhesive can be improved. Finally, the cable 16 core exposed on the inner side of the wiring closed seat and the grounding electrode 2 can be isolated from oxygen by the transformer oil 13.

[0029] The cable connector includes a sealing plug 14 and a screw column 15 that are movably engaged with the cable 16; the screw column 15 is screwed into the threaded groove and tightens the sealing plug 14 against the sealing groove. The cable 16 passes through the screw column 15 and the sealing plug 14. The continuous screwing of the screw column 15 causes the sealing plug 14 to elastically deform, thereby tightening the cable 16 and preventing external moisture from entering.

[0030] A snap ring 17 is provided on the top of the sealing plug 14, and the bottom surface of the snap ring 17 is cast on the inside of the sealing plug 14. When it is necessary to regularly add oil to the wiring closure seat, unscrew the screw column 15 and insert the handle into the snap ring 17. The sealing plug 14 is pulled out of the wiring closure seat by the handle, and then transformer oil 13 is injected into the wiring closure seat. After the oil filling is completed, the screw column 15 and the sealing plug 14 are re-sealed on the top of the wiring closure seat.

[0031] It also includes a sealing head 18, which is screwed to the thread groove before the cable 16 and the grounding electrode 2 are connected; the sealing head 18 is used to seal the top of the wiring closure seat to prevent external moisture from penetrating into the inside of the wiring closure seat.

[0032] The top surface of the sealing head 18 is provided with a sealing nozzle 19, and the sealing nozzle 19 is an inflation nozzle or an oil filling bolt; the sealing head 18 is provided with a sealing jacket 20 outside the sealing nozzle 19; when oil filling is required, the oil filling bolt is opened and the transformer oil 13 is injected. After the oil filling is completed, the oil filling bolt is used to seal; the inflation device can also be used to inject pressurized gas into the wiring closure seat through the inflation nozzle to prevent external water vapor from penetrating.

[0033] The connection between the cable 16 and the grounding electrode 2 is immersed in the transformer oil 13. By immersing the connection between the cable 16 and the grounding electrode 2 in the transformer oil 13, the cable 16 core and the grounding electrode 2 exposed inside the wiring enclosure can be isolated from oxygen.

[0034] A transparent oil filling pipe 21 is fixed to the upper part of the outer wall of the wiring closed seat, and the oil filling pipe 21 is connected to the inner wall of the wiring closed seat. An oil filling plug 22 is screwed on the top of the oil filling pipe 21; the internal oil level can be observed through the oil filling pipe 21 during the grounding inspection. When the oil level drops, it can be discovered in time that the oil level is too low or there is poor contact at the connection between the grounding electrode 2 and the cable 16, and the oil filling plug 22 can be opened to regularly replenish transformer oil 13 to the inside of the wiring closed seat.

[0035] The bottom of the copper tube 1 is integrally formed with an expanded diameter portion 23. The expanded diameter portion 23 can increase the diameter of the bottom of the copper tube 1, and by filling the expanded diameter portion 23 with a resistance reducing agent filler 10, the structural support strength of the grounding electrode 2 can be increased, and the grounding stability of the grounding electrode 2 can be improved.

[0036] A plurality of flexible graphene grounding bodies 24 are fixed to the outer bottom of the expanded diameter portion 23 by bolts. The flexible graphene grounding bodies 24 can be spread around the grounding grid, thereby achieving good contact between the grounding electrode 2, the copper tube 1, the flexible graphene grounding body 24 and the surrounding grounding positions, further improving the grounding stability.

[0037] The drag reducing agent filler 10 is a salt drag reducing agent, a metal oxide drag reducing agent, a conductive high polymer or a composite drag reducing agent; salt drag reducing agents such as sodium chloride and calcium chloride are dissolved in conductive cement or other carriers to increase the overall ion concentration, thereby reducing the peripheral resistivity; metal oxide drag reducing agents such as zinc oxide and magnesium oxide have high conductivity and reduce the peripheral resistance; composite drag reducing agents can be made of finished drag reducing agents such as fine graphite, bentonite, curing agent, lubricant and conductive cement.

[0038] The top of the wiring closing seat is integrally formed with an adjustment disk 25, and a plurality of arc-shaped adjustment holes 26 are opened on the adjustment disk 25. The top surface of the adjustment disk 25 is pressed with an adjustment seat 27, and the middle part of the adjustment seat 27 is integrally formed with an inclination tube 28; the cable 16 is led out from the inclination tube 28; the adjustment seat 27 passes through a bolt, and the bolt passes through the arc-shaped adjustment hole 26 and is locked by a nut; during installation, loosen the bolt and nut, and then adjust the inclination tube 28 to the same direction according to the routing direction of the cable 16. After the adjustment is completed, tighten the bolt and nut to lock the position of the adjustment disk 25, so that the cable 16 can smoothly transition to the routing direction to avoid bending.

[0039] A rail transit station building grounding electrode 2 protection method, using a rail transit station building grounding electrode 2 protection device, the method is specifically as follows: The first step is to pre-embed the grounding electrode 2. The copper tube 1 and the grounding electrode 2 are laid out inside the casting mold. Next, the bottom of the grounding electrode 2 is fixed to the grounding end, and the copper tube 1 is fixed to the steel bars inside the casting mold. Next, the copper tube 1 and the insulating jacket 3 are cast and pre-embedded inside the concrete. When pouring the copper tube 1 or the insulating jacket 3, the copper tube 1 and the steel bars are welded together, or the copper tube 1 and the insulating jacket 3 are supported by an internal formwork, and finally poured into the concrete. Before pouring, the distance between the ends of the copper tube 1 and the insulating jacket 3 can be adjusted by rotating the copper tube 1 and the insulating jacket 3 so that the top surface of the insulating jacket 3 is at the same height. In the second step, the protective core is loaded once. After the concrete is solidified, a resistance reducing agent filler 10 is injected into the copper tube 1 and compacted. After the resistance reducing agent filler 10 is solidified, a cable cold sealing adhesive (pre-cast cable cold sealing adhesive 11) is poured into the inner side of the insulating jacket 3. After the resistance reducing agent filler 10 is solidified, a stable support system is provided for the root of the grounding electrode 2. That is, the solidified resistance reducing agent filler 10 can fill the copper tube 1 and the grounding point to prevent the grounding electrode 2 from peeling off from the grounding point. At the same time, the conductive property of the resistance reducing agent can increase the grounding stability of the cable 16. The third step is to install the wiring closure seat. After the cable cold seal compound solidifies, press the sealing ring inside the sealing ring 6. Then, press the wiring closure seat onto the top of the insulating jacket 3 and tighten it with bolts. Then, seal the top of the wiring closure seat and pour transformer oil 13 or compressed air into the inside of the wiring closure seat, waiting for the cable 16 to be installed. Before the cable 16 is installed, the transformer oil 13 or compressed air can isolate the air around the grounding electrode 2. The sealing ring 6 and the cable cold seal compound can form a sealed space inside the wiring closure seat, which can protect the grounding electrode 2 and prevent the grounding electrode 2 from rusting. The fourth step is to assemble the cable 16. First, release the compressed air inside the wiring enclosure or extract the transformer oil 13. Then, disassemble and separate the wiring enclosure and the insulating jacket 3, and pass the cable 16 through the cable 16 connector and the wiring enclosure in sequence. Next, electrically connect the cable 16 to the grounding electrode 2, and reassemble the wiring enclosure and the insulating jacket 3. The fifth step is to load the secondary protective core, and inject the cable cold sealing adhesive (cast-in-place cable cold sealing adhesive 12) into the wiring closed seat for the second time through the gap between the sealing groove and the cable 16. After the cable cold sealing adhesive is cured, the transformer oil 13 is injected into the wiring closed seat again through the gap between the sealing groove and the cable 16. Then, the screw column 15 is continuously rotated downward along the thread groove until the screw column 15 is tightly pressed against the top of the sealing plug 14. The sealing plug 14 is compressed and deformed by the sealing groove. The sealing plug 14 holds the cable 16 tightly and pressurizes the transformer oil 13 at the same time, so that the transformer oil 13 completely wraps around the connection point between the cable 16 and the grounding electrode 2.

[0040] After the secondary protective core is loaded, transformer oil 13 is regularly added to the wiring enclosure to prevent the grounding electrode 2 and the cable 16 connection position from being exposed to the air. Regularly adding transformer oil 13 can ensure that the transformer oil 13 always immerses the grounding electrode 2 and the cable 16 connection position, thereby achieving insulation, cooling and protection around the connection position, isolating oxygen, and preventing the grounding electrode 2 from oxidizing, which may cause aging of the cable core 16 and the grounding electrode 2 at the connection position.

[0041] The above embodiments are only preferred implementations of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the scope of application of the present invention are included in the scope of application of the present invention.

Claims

1. A grounding electrode protection device for a rail transit station building, characterized by: include: A copper tube, wherein the outer wall of the copper tube is provided with a threaded structure, and a grounding electrode is movably penetrated through the axis of the copper tube; An insulating jacket, wherein the inner wall of the insulating jacket is a convex structure, and the large-diameter end of the inner wall of the insulating jacket is screwed to the copper tube; the top of the insulating jacket is integrally formed with a disc seat, and the insulating jacket is integrally formed with multiple reinforcing ribs at the bottom of the disc seat; the top of the disc seat is provided with multiple sealing rings, and the disc seat is provided with multiple screw holes spaced between the sealing rings; The copper tube and the reinforcement rib are cast inside the concrete foundation; A wiring closure seat, comprising an I-shaped seat, the top of which is integrally formed with a wiring tube, the upper portion of the inner wall of which is provided with a threaded groove, and the inner wall of which is integrally formed with a V-shaped sealing groove at the bottom of the threaded groove; the I-shaped seat is pressed onto the top surface of the insulating jacket via a sealing ring, and the I-shaped seat is provided with a plurality of bolts that are tightened into the screw holes; the top of the grounding electrode is provided on the inner side of the I-shaped seat; The protective core includes a resistance reducing agent filler poured into the inner wall of the copper tube, and the middle of the inner side of the insulating jacket to the top surface of the resistance reducing agent filler is poured with a pre-cast cable cold seal adhesive; the lower inner side of the wiring sealing seat to the top surface of the pre-cast cable cold seal adhesive is poured with a cast-in-place cable cold seal adhesive; the wiring tube is poured with transformer oil from the lower part of the sealing groove to the top surface of the cast-in-place cable cold seal adhesive; A cable connector comprises a sealing plug and a screw column movably engaged with the cable; the screw column is screwed to the threaded groove and tightens the sealing plug to the sealing groove.

2. The rail transit station building grounding electrode protection device according to claim 1, characterized in that: A clamping ring is provided on the top of the sealing plug, and the bottom surface of the clamping ring is cast on the inner side of the sealing plug.

3. The rail transit station building grounding electrode protection device according to claim 1, characterized in that: It also includes a sealing head, which is screwed to the thread groove before the cable and the grounding electrode are connected.

4. The rail transit station building grounding electrode protection device according to claim 3, characterized in that: The top surface of the sealing head is provided with a sealing nozzle, which is an inflation nozzle or an oil injection bolt; the sealing head is provided with a sealing jacket outside the sealing nozzle.

5. The rail transit station building grounding electrode protection device according to claim 1, characterized in that: The connection between the cable and the grounding electrode is immersed in transformer oil.

6. The rail transit station building grounding electrode protection device according to claim 1, characterized in that: A transparent oil filling pipe is fixed on the upper part of the outer wall of the wiring closing seat. The oil filling pipe is communicated with the inner wall of the wiring closing seat. An oil filling screw plug is screwed on the top of the oil filling pipe.

7. The rail transit station building grounding electrode protection device according to claim 1, characterized in that: The bottom of the copper tube is integrally formed with an expanded diameter portion.

8. The rail transit station building grounding electrode protection device according to claim 7, characterized in that: A plurality of flexible graphene grounding bodies are fixed to the outer bottom of the expanded diameter portion by bolts.

9. The rail transit station building grounding electrode protection device according to claim 1, characterized in that: The drag reducing agent filler is a salt drag reducing agent, a metal oxide drag reducing agent, a conductive high molecular polymer or a composite drag reducing agent.

10. The rail transit station building grounding electrode protection device according to claim 1, characterized in that: The top of the wiring closing seat is integrally formed with an adjustment disk, a plurality of arc-shaped adjustment holes are opened on the adjustment disk, the top surface of the adjustment disk is pressed with an adjustment seat, and the middle part of the adjustment seat is integrally formed with an inclination tube; the cable is led out from the inclination tube; the adjustment seat is passed through a bolt, and the bolt passes through the arc-shaped adjustment hole and is locked by a nut.

11. A method for protecting a grounding electrode of a rail transit station building, using the rail transit station building grounding electrode protection device according to any one of claims 1 to 10, characterized in that: The method is specifically as follows: The first step is to pre-embed the grounding electrode. The copper tube and grounding electrode are laid out inside the casting mold. Next, the bottom of the grounding electrode is fixed to the grounding terminal, and the copper tube is fixed to the steel bar inside the casting mold. Next, the copper tube and insulating jacket are cast and pre-embedded inside the concrete. The second step is to load the protective core once, wait for the concrete to solidify, inject the resistance reducing agent filler into the copper tube, and tamp the resistance reducing agent filler. After the resistance reducing agent filler solidifies, pour the cable cold sealing compound into the inner side of the insulation jacket; The third step is to install the wiring closure. After the cable cold seal compound solidifies, press the sealing ring inside the sealing ring. Then, press the wiring closure onto the top of the insulating jacket and tighten it with bolts. Then, seal the top of the wiring closure and inject transformer oil or compressed air into the inside of the wiring closure. Wait for the cable to be installed. The fourth step is cable assembly. First, release the compressed air inside the wiring enclosure or extract the transformer oil. Then, separate the wiring enclosure and the insulating jacket, and pass the cables through the cable connector and wiring enclosure in sequence. Next, electrically connect the cables to the grounding electrode, and reassemble the wiring enclosure and the insulating jacket. The fifth step is to load the secondary protective core and inject the cable cold sealing compound into the wiring closure seat through the gap between the sealing groove and the cable for the second time. After the cable cold sealing compound is solidified, inject transformer oil into the wiring closure seat through the gap between the sealing groove and the cable again. Then, continue to rotate the screw column downward along the threaded groove until the screw column is pressed against the top of the sealing plug. The sealing plug is compressed and deformed by the sealing groove, and the sealing plug holds the cable tightly while pressurizing the transformer oil so that the transformer oil completely wraps around the cable and the grounding electrode connection.

12. The rail transit station building grounding electrode protection method according to claim 11, characterized in that: After the secondary protection core is loaded, transformer oil is regularly added to the wiring enclosure.

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