Power transmission line drilling and crossing tower and power transmission line tower system

Abstract

The invention discloses a power transmission line drilling tower and a power transmission line tower system, and relates to the technical field of power towers, the power transmission line drilling tower comprises a tower body, the top of the tower body is provided with a cross arm, the two sides of the top of the cross arm are provided with grounding frames, the middle part and the end part of the cross arm are hung with insulator strings through hanging pieces, and the end part of each insulator string is provided with a ball joint assembly; a buffering assembly is arranged at the end of the ball joint assembly, a fixing fitting is arranged at the end of the buffering assembly, the ball joint assembly comprises a spherical groove seat, a ball seat is arranged in the spherical groove seat in a rolling fit mode, a connecting rod is arranged on the side face of the ball seat, the buffering assembly comprises two fixing seats, and connecting rods are hinged to the two ends of each fixing seat. According to the invention, after the tension degree of the cable is increased to a certain degree, intervention can be carried out in time, the tension degree is prevented from being further increased to damage the tower body and the cable fixing structure, and the swinging of the cable is effectively inhibited.

Description

Technical Field

[0001] This invention relates to the field of power tower technology, specifically to transmission line tunnel towers and transmission line tower systems. Background Technology

[0002] With the continuous development of urban and regional power grids, new transmission line corridors are becoming increasingly strained. It is often necessary to build new cable lines that "drill" under existing overhead transmission lines. Moreover, transmission lines often need to cross complex terrain or various obstacles, such as rivers, valleys, railways, highways, urban building complexes, and ecological protection areas. Therefore, tunnel towers are widely used.

[0003] Chinese patent application number 202010628601.2 discloses a single-circuit transmission line tower comprising: a tower body, a curved arm, a grounding frame, a conductor crossarm, and an additional crossarm; the tower body is buried in the ground, and the curved arm is connected to the tower body; the conductor crossarm comprises a first conductor crossarm, a second conductor crossarm, and a third conductor crossarm connected in sequence, with the second conductor crossarm connected to the curved arm; the grounding frame comprises at least one first grounding frame and a second grounding frame, with the first grounding frame connected to the first conductor crossarm and the second grounding frame connected to the third conductor crossarm; the additional crossarm is connected to either the first or third conductor crossarm, and a ground wire is provided on the additional crossarm at the drilling and crossing section of the tower, while no ground wire is provided on the additional crossarm at the non-drilling and crossing section. However, in actual use, the cable and the insulator string are rigidly connected, making it difficult to adaptively adjust the cable tension and adapt to changes in cable tension.

[0004] Furthermore, due to the influence of external temperature, the conductors shrink when they cool down, becoming shorter. This leads to a reduction in sag and an increase in conductor tension. When the cable tension increases to its limit, it further increases the load on the tower structure and cable fixing structure, causing damage to both structures. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a transmission line tunnel tower and transmission line tower system that can intervene in a timely manner after the cable tension increases to a certain extent, so as to prevent the tension from increasing further and damaging the tower body and cable fixing structure, and can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a transmission line tunnel tower, comprising a tower body, a crossarm at the top of the tower body, grounding frames on both sides of the top of the crossarm, insulator strings being hung at the middle and ends of the crossarm by means of hangers, ball joint assemblies at the ends of the insulator strings, buffer assemblies at the ends of the ball joint assemblies, and fixing hardware at the ends of the buffer assemblies. The ball joint assembly includes a spherical groove seat, in which a ball seat is rolled in fit, and a connecting rod is provided on the side of the ball seat; The buffer assembly includes a fixed seat, two fixed seats are provided, each fixed seat has a connecting rod hinged to both ends, a movable seat is hinged between the two opposite connecting rods, a connecting plate is staggered between the movable seats on both sides, and a buffer spring is provided between the two connecting plates. A hinge seat is provided on the fixed seat on the side away from the ball joint assembly, and the end of the hinge seat is rotatably connected to the back side of the fixed hardware. An auxiliary linkage protection mechanism is provided between the ball joint assembly and the buffer assembly, and a main linkage protection mechanism is provided between the buffer assembly and the fixing hardware.

[0007] Preferably, a cable is fixed on the fixing hardware, the fixing hardware has a "┌" shaped structure, an arc-shaped groove that mates with the cable is opened on the inner side of the fixing hardware, and a U-shaped fastener for fixing the cable is provided on the fixing hardware.

[0008] Preferably, the connecting rod passes through the opening on the side of the spherical groove seat, and an elastic pad is provided on the opening; The ball seat is a hollow structure, and the connecting rod is a hollow structure that communicates with the ball seat.

[0009] Preferably, the inner wall of the ball seat is provided with through holes evenly, and a pin is slidably fitted inside the through hole; the inner wall of the spherical groove seat is provided with limit grooves evenly.

[0010] Preferably, the fixing seat near the ball joint assembly is located at the end of the connecting rod, and the connecting rods on the two fixing seats are arranged opposite to each other, and the connecting plate has an L-shaped structure.

[0011] Preferably, the auxiliary linkage protection mechanism includes a limiting post, which is located on the side of the connecting plate near the ball joint assembly. A limiting seat is movably sleeved on the limiting post. The limiting seat is provided with a guide rod through an end seat. The guide rod extends into the connecting rod through a fixed seat on one side. The end of the guide rod is provided with a piston that slides with the inner wall of the connecting rod. A tension spring is sleeved on the outside of the guide rod.

[0012] Preferably, the main linkage protection mechanism includes a slide and a positioning seat. The slide slides through the surface of the hinge seat, and a pressure seat is provided on the side of the slide. An elastic element is provided between the pressure seat and the surface of the hinge seat. The positioning seat is located at the bottom back of the fixing hardware, and the end of the positioning seat abuts against the side of the slide.

[0013] Preferably, the surface of the hinge seat is provided with a support, and a slide rod slides through the side of the support. The slide rod passes through the side of the slide seat, and a baffle is provided on the slide rod. A limiting spring is sleeved on the slide rod at the position between the baffle and the support. The main linkage protection mechanism also includes a stop seat, which is provided on the movable seat and abuts against the end of the slide rod.

[0014] The present invention also discloses a power transmission line tower system, which includes at least one of the aforementioned drilling towers and several conventional power transmission towers, wherein the drilling towers and conventional power transmission towers are connected by cables.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a buffer component, when the cable tension changes, the two fixed seats move away from each other under the action of tension, and the movable seat closes, which drives the connecting plate to compress the buffer spring. This adaptively absorbs the changes in tension, effectively offsets the direct load of cable tension fluctuations on the tower structure, insulator string and cable fixing structure, prevents structural damage caused by continuous increase in tension, and improves the reliability and service life of the overall system.

[0016] 2. When the cable tension increases to a preset value, the stop on the movable seat disengages from the end of the slide rod, and the compressed limit spring quickly extends, causing the slide rod to disengage from the slide seat to release the limit. At the same time, the elastic element extends and pushes the slide seat away from the positioning seat, causing the fixing hardware to rotate around the end of the hinge seat. This effectively increases the cable tension allowance, quickly reduces the cable tension force, and prevents damage to the cable fixing structure, insulator string, and tower body due to tension exceeding the bearing limit.

[0017] 3. In this invention, while the main linkage protection mechanism is activated, the limiting post on the connecting plate disengages from the limiting seat, and the tension spring in the stretched state retracts and resets. Through the end seat, it drives the guide rod and piston to move into the ball seat. The pressure inside the ball seat increases, pushing the pin out of the through hole and into the limiting groove on the inner wall of the spherical groove seat, thus limiting the rolling between the ball seat and the spherical groove seat. This suppresses the swaying amplitude of the cable, ensuring the stability of the tower body, insulator string and cable fixing structure, and avoiding structural instability caused by increased sag. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the buffer component structure of the present invention; Figure 3 This is a partial cross-sectional view of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 For the present invention Figure 3 Enlarged structural diagram at point B; In the diagram: 1. Tower body; 101. Crossarm; 102. Grounding frame; 103. Hanger; 104. Insulator string; 2. Ball joint assembly; 201. Spherical slot seat; 202. Ball seat; 203. Connecting rod; 204. Through hole; 205. Pin; 206. Limiting groove; 3. Buffer assembly; 301. Fixed seat; 302. Connecting rod; 303. Movable seat; 304. Connecting plate; 305. Buffer spring Spring; 306, Limiting post; 307, Limiting seat; 308, End seat; 309, Guide rod; 310, Piston; 311, Tension spring; 312, Hinge seat; 313, Slide seat; 314, Pressure seat; 315, Elastic element; 316, Positioning seat; 317, Support; 318, Slide rod; 319, Baffle; 320, Limiting spring; 321, Stop seat; 4, Fixing hardware; 401, Cable. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-5 The present invention discloses a transmission line tunnel tower, including a tower body 1, a crossarm 101 at the top of the tower body 1, grounding frames 102 on both sides of the top of the crossarm 101, and insulator strings 104 being hung on the middle and ends of the crossarm 101 by hangers 103.

[0021] Specifically, the tower body 1 adopts an angle steel structure, which has good wind resistance, ice resistance and earthquake resistance. The bottom of the tower body 1 is fixed on the preset tower base. The crossarm 101 is made of high-strength steel. The grounding frame 102 is used for lightning protection. The insulator string 104 is set almost horizontally to achieve electrical insulation between the tower body 1 and the cable 401.

[0022] The end of the buffer assembly 3 is provided with a fixing hardware 4, on which a cable 401 is fixed. The fixing hardware 4 has a “┌” shaped structure. An arc-shaped groove that mates with the cable 401 is opened on the inner side of the fixing hardware 4. A U-shaped fastener for fixing the cable 401 is provided on the fixing hardware 4.

[0023] Specifically, the “┌” shaped structure design facilitates the bending and turning of the cable 401, while increasing friction. Anti-slip pads are set inside the arc groove to enhance friction. The arc segment of the U-shaped fastener and the arc of the arc groove on the inner side of the fixing hardware 4 combine to form a circular structure, so as to better wrap and fix the cable 401.

[0024] The insulator string 104 is provided with a ball joint assembly 2 at its end. The ball joint assembly 2 includes a spherical groove seat 201, a ball seat 202 that is rolled in the spherical groove seat 201, and a connecting rod 203 on the side of the ball seat 202. The connecting rod 203 passes through an opening on the side of the spherical groove seat 201, and an elastic pad is provided on the opening.

[0025] Specifically, when the cable 401 swings, the connecting rod 203 will swing through the fixing hardware 4 and the buffer assembly 3. The opening is set to provide swing space for the cable 401 to swing at multiple angles, and the elastic pad is set to provide elastic buffer for the swing of the connecting rod 203 and reduce wear.

[0026] The ball joint assembly 2 is provided with a buffer assembly 3 at its end. The buffer assembly 3 includes a fixed seat 301. Two fixed seats 301 are provided. The fixed seat 301 on the side closer to the ball joint assembly 2 is located at the end of the connecting rod 203. Each fixed seat 301 has a connecting rod 302 hinged at both ends. The connecting rods 302 on the two fixed seats 301 are arranged opposite to each other. A movable seat 303 is hinged between the two opposite connecting rods 302. A connecting plate 304 is provided alternately between the movable seats 303 on both sides. The connecting plate 304 has an L-shaped structure. A buffer spring 305 is provided between the two connecting plates 304. A hinge seat 312 is provided on the fixed seat 301 on the side away from the ball joint assembly 2. The end of the hinge seat 312 is rotatably connected to the back side of the fixing hardware 4.

[0027] Specifically, under the tension of the cable 401, the fixed seat 301 on the side away from the ball joint assembly 2 will be pulled, causing the fixed seats 301 on both sides to move away from each other. At the same time, the movable seats 303 on both sides will close together, and the bent sections of the two staggered connecting plates 304 will move closer to each other, causing the buffer spring 305 to be compressed. Thus, when the tension of the cable 401 increases, the buffer spring 305 will be adaptively compressed, and when the tension of the cable 401 decreases, the buffer spring 305 will adaptively extend and reset, thereby offsetting the impact of the change in the tension of the cable 401 on the tower body 1 structure, the insulator string 104 structure, and the cable 401 fixing structure. This prevents the change in the tension of the cable 401 from directly acting on the tower body 1 structure, the insulator string 104 structure, and the cable 401 fixing structure, effectively protecting the overall structure.

[0028] However, in actual use, especially under the effects of low-temperature shrinkage of cable 401 and external wind force, the tension of cable 401 will increase significantly. When the tension increases to the point of exceeding the structural design's bearing limit, it can easily cause damage to the cable 401 fixing structure, the insulator string 104 structure, and the tower body 1 structure. Therefore, the following improvements are made: The hinge seat 312 is equipped with a main linkage protection mechanism, which includes a slide 313, a positioning seat 316, and a stop 321. The slide 313 slides through the surface of the hinge seat 312. A pressure seat 314 is provided on the side of the slide 313. An elastic element 315 is provided between the pressure seat 314 and the surface of the hinge seat 312. The positioning seat 316 is located at the bottom back of the fixing hardware 4. The end of the positioning seat 316 abuts against the side of the slide 313. A support 317 is provided on the surface of the hinge seat 312. A slide rod 318 slides through the side of the support 317. The slide rod 318 passes through the side of the slide 313. A baffle 319 is provided on the slide rod 318. A limiting spring 320 is sleeved on the slide rod 318 at the position between the baffle 319 and the support 317. The stop 321 is located on the movable seat 303. The stop 321 abuts against the end of the slide rod 318.

[0029] Specifically, in the initial state, both the limiting spring 320 and the elastic element 315 are in a compressed state. The elastic element 315 is preferably a spring. Due to the contact between the positioning seat 316 and the slide 313, the fixing hardware 4 cannot rotate around the end of the hinge seat 312. The slide rod 318 limits the slide 313 by passing through it. Under normal tension, the up and down movement of the stop 321 will not disengage from the slide rod 318.

[0030] During use, as the cable 401 gradually tensions, the distance between the two movable seats 303 gradually decreases. Simultaneously, the end of the slide rod 318 slides along the side of the stop 321. When the tension of the cable 401 increases to a preset value, the stop 321 completely disengages from the end of the slide rod 318. At the same time, the compressed limiting spring 320 quickly extends and resets, pushing the stop 319 to cause the slide rod 318 to slide away from the slide seat 313, thus disengaging the end of the slide rod 318 from the slide seat 313 and releasing the slide rod 318 from its limiting position on the slide seat 313. Simultaneously, the elastic element 315 quickly extends and resets, pushing the pressure seat 314 to cause the slide seat 313 to slide away from the positioning seat 316. Figure 3 As shown, after the side of the slide 313 is completely disengaged from the positioning seat 316, since the end of the hinge seat 312 is rotatably connected to the middle of the back side of the fixing hardware 4 and the rotation position does not correspond to the cable 401, the top of the fixing hardware 4 is pulled and rotated under the tension of the cable 401, thereby effectively increasing the tension allowance of the cable 401, reducing the tension of the cable 401, and preventing the tension of the cable 401 from exceeding the limit and causing damage to the cable 401 fixing structure, the insulator string 104 structure, and the tower body 1 structure.

[0031] However, when the main linkage protection mechanism increases the tension allowance of cable 401, it will lead to an increase in sag, which will increase the swing amplitude of cable 401 and thus affect the stability of the overall structure. Therefore, the following improvements are made: The ball seat 202 is a hollow structure, and the connecting rod 203 is a hollow structure that communicates with the ball seat 202. The inner wall of the ball seat 202 is evenly provided with through holes 204, and a pin 205 is slidably fitted inside the through hole 204. The inner wall of the spherical groove seat 201 is evenly provided with limit grooves 206.

[0032] Specifically, the connecting rod 203 and the ball seat 202 are both hollow to form a connected sealed chamber. The through hole 204 and the limiting groove 206 are densely distributed on the ball seat 202 and the spherical groove seat 201, respectively. Under normal conditions, the pin 205 does not protrude from the through hole 204, and the ball seat 202 can rotate freely. When locking is required, the end of the pin 205 protrudes from the through hole 204 and is inserted into the limiting groove 206. At this time, both ends of the pin 205 are engaged with the through hole 204 and the limiting groove 206, respectively, thereby restricting the rolling between the spherical groove seat 201 and the ball seat 202.

[0033] The side of the connecting plate 304 is provided with an auxiliary linkage protection mechanism, which includes a limiting post 306. The limiting post 306 is located on the side of the connecting plate 304 near the ball joint assembly 2. A limiting seat 307 is movably sleeved on the limiting post 306. The limiting seat 307 is provided with a guide rod 309 through the end seat 308. The guide rod 309 extends through the fixed seat 301 on one side and into the connecting rod 203. The end of the guide rod 309 is provided with a piston 310 that slides with the inner wall of the connecting rod 203. A tension spring 311 is sleeved on the outside of the guide rod 309.

[0034] Specifically, in the initial state, the tension spring 311 is stretched and in an energy storage state, and the limiting seat 307 positions the end of the guide rod 309 by being sleeved on the limiting post 306. Under normal tension, the up and down movement of the limiting post 306 will not disengage from the limiting seat 307.

[0035] During use, the movable seats 303 on both sides move in opposite directions due to the increased tension, causing the end of the slide rod 318 to disengage from the hinge seat 312. At the same time, the limiting post 306 moves downward and disengages from the limiting seat 307. At this time, the stretched tension spring 311 quickly contracts and resets, driving the end seat 308 to move towards the ball joint assembly 2. This causes the guide rod 309 to drive the piston 310 to move quickly into the ball seat 202. The sliding of the piston 310 pushes gas into the ball seat 202, increasing the pressure inside the ball seat 202. This pushes the pin 205 in the through hole 204 to slide out of the ball seat 202, causing the end of the pin 205 to extend out of the through hole 204 and insert into the limiting groove 206. This achieves the limiting between the ball seat 202 and the spherical groove seat 201, further restricting the rolling between the ball seat 202 and the spherical groove seat 201, thereby effectively suppressing the swing of the cable 401 and ensuring the stability of the tower body 1 structure, the insulator string 104 structure, and the cable 401 fixing structure.

[0036] The present invention also discloses a power transmission line tower system, which includes at least one of the above-mentioned drilling towers and several conventional power transmission towers, wherein the drilling tower and the conventional power transmission towers are connected by a cable 401.

[0037] In addition, the aforementioned tower foundation was constructed using a multi-head water-cooled drill for drilling. During construction, the multi-head water-cooled drill used a pit-end support or a crawler chassis. Three 120mm diameter water-cooled drill bits were fixed on a rotatable integrated support on the same horizontal plane. Each water-cooled drill bit was equipped with a water supply port and was powered by electricity. The three water-cooled drills worked simultaneously to drill holes, with a drilling depth of approximately 700mm. After drilling was completed, the rotatable integrated support was rotated clockwise to start drilling the next set of holes until the outer diameter hole was completed.

[0038] After the outer diameter borehole is completed, the construction workers use special clamps to remove the outer diameter rock core. The foundation pit forms a concentric circle with an outer diameter of about 200mm. A hydraulic core breaker is placed on one side of the concentric circle. The lateral expansion force of the hydraulic core breaker pushes the central rock mass up until it breaks completely. After the break, the central rock mass is a whole rock mass with a diameter of about 900mm and a height of 700mm. The weight of the central rock mass varies from about 1.5 to 2 tons depending on the lithology.

[0039] After the hydraulic core breaker is removed, the hoisting equipment uses an expansion-lock sling. The sling is placed into the central hole, and the equipment lifts the entire central rock mass out of the pit.

[0040] Personnel went down into the pit to level the bottom. After the bottom was leveled, a central hole was drilled and core samples were taken at the pit opening. At this point, the excavation of a section of the foundation pit with a depth of about 400mm was completed. The water-cooled drill array was used repeatedly to construct the next section of the pit until the designed depth was reached.

[0041] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A transmission line tunnel tower, comprising a tower body (1), wherein a crossarm (101) is provided at the top of the tower body (1), and grounding frames (102) are provided on both sides of the top of the crossarm (101), characterized in that, The crossarm (101) has insulator strings (104) attached to its middle and end via hangers (103). The end of the insulator string (104) is provided with a ball joint assembly (2), the end of the ball joint assembly (2) is provided with a buffer assembly (3), and the end of the buffer assembly (3) is provided with a fixing hardware (4). The ball joint assembly (2) includes a spherical groove seat (201), a ball seat (202) is rolled in the spherical groove seat (201), and a connecting rod (203) is provided on the side of the ball seat (202). The buffer assembly (3) includes a fixed seat (301), two fixed seats (301) are provided, and each fixed seat (301) has a connecting rod (302) hinged at both ends. A movable seat (303) is hinged between the two opposite connecting rods (302). A connecting plate (304) is provided alternately between the movable seats (303) on both sides, and a buffer spring (305) is provided between the two connecting plates (304). A hinge seat (312) is provided on the fixed seat (301) on the side away from the ball joint assembly (2), and the end of the hinge seat (312) is rotatably connected to the back side of the fixed hardware (4). An auxiliary linkage protection mechanism is provided between the ball receiving assembly (2) and the buffer assembly (3), and a main linkage protection mechanism is provided between the buffer assembly (3) and the fixing hardware (4).

2. The transmission line tunneling tower according to claim 1, characterized in that: The fixing hardware (4) has a cable (401) fixed on it. The fixing hardware (4) has a "┌" shaped structure. The inner side of the fixing hardware (4) has an arc-shaped groove that matches the cable (401). The fixing hardware (4) has a U-shaped fastener for fixing the cable (401).

3. The transmission line tunneling tower according to claim 1, characterized in that: The connecting rod (203) passes through the opening on the side of the spherical groove seat (201), and an elastic pad is provided on the opening; The ball seat (202) is a hollow structure, and the connecting rod (203) is a hollow structure that communicates with the ball seat (202).

4. The transmission line tunneling tower according to claim 3, characterized in that: The inner wall of the ball seat (202) is uniformly provided with through holes (204), and a pin (205) is slidably fitted inside the through hole (204). The inner wall of the spherical groove seat (201) is uniformly provided with limiting grooves (206).

5. The transmission line tunneling tower according to claim 1, characterized in that: A fixing seat (301) near the ball joint assembly (2) is located at the end of the connecting rod (203), and connecting rods (302) on both fixing seats (301) are arranged opposite to each other. The connecting plate (304) has an L-shaped structure.

6. The transmission line tunneling tower according to claim 1, characterized in that: The auxiliary linkage protection mechanism includes a limiting post (306), which is located on the side of the connecting plate (304) near the ball joint assembly (2). A limiting seat (307) is movably sleeved on the limiting post (306). The limiting seat (307) is provided with a guide rod (309) through the end seat (308). The guide rod (309) extends through the fixed seat (301) on one side and into the connecting rod (203). The end of the guide rod (309) is provided with a piston (310) that slides with the inner wall of the connecting rod (203). A tension spring (311) is sleeved on the outside of the guide rod (309).

7. The transmission line tunneling tower according to claim 1, characterized in that: The main linkage protection mechanism includes a slide (313) and a positioning seat (316). The slide (313) slides through the surface of the hinge seat (312). A pressure seat (314) is provided on the side of the slide (313). An elastic element (315) is provided between the pressure seat (314) and the surface of the hinge seat (312). The positioning seat (316) is located at the bottom back of the fixing hardware (4). The end of the positioning seat (316) abuts against the side of the slide (313).

8. The transmission line tunneling tower according to claim 7, characterized in that: The surface of the hinge seat (312) is provided with a support (317), and a slide rod (318) slides through the side of the support (317). The slide rod (318) passes through the side of the slide seat (313). A baffle (319) is provided on the slide rod (318). A limiting spring (320) is sleeved on the slide rod (318) between the baffle (319) and the support (317). The main linkage protection mechanism also includes a stop (321). The stop (321) is provided on the movable seat (303), and the stop (321) abuts against the end of the slide rod (318).

9. A transmission line tower system, characterized in that, The transmission line tower system includes a transmission line tunnel tower as described in any one of claims 1-8, and also includes several conventional transmission towers, with the tunnel tower and the conventional transmission towers connected by a cable (401).

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