A compact grounding device for a power transmission line tower and a construction method thereof

Abstract

A kind of power transmission line tower compact grounding device, including annular pull ring fixed on the top of pile foundation, outer-applied surface electrode covered on the outside of pile foundation and ground down lead fixed on the top of pile foundation, multiple pull rods are arranged on annular pull ring along its circumferential direction, multiple pull rods are arranged in the shape of Chinese character, pull rod includes outer clamping groove, first connecting rod and second connecting rod, one end of first connecting rod is connected with hook for hanging outer-applied surface electrode, the other end of first connecting rod is clamped with one end of outer clamping groove, the other end of outer clamping groove is clamped with one end of second connecting rod, the other end of second connecting rod is connected with annular pull ring, ground down lead is ground wire with terminal nose, terminal nose is connected with tower leg or ground terminal row of tower, ground wire is attached with outer-applied surface electrode, upper portion, middle portion and lower portion of outer-applied surface electrode periphery are bound by banding.The design not only has good resistance reduction effect, but also has high reliability, and is simple to construct.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power system, especially to a compact grounding device for transmission line tower and a construction method thereof, which is mainly suitable for improving the resistance reduction effect of the grounding device. BACKGROUND

[0002] Resistance reduction of the transmission tower requires additional artificial grounding body. When the fault current flows into the ground through the tower base, the current is not uniformly dispersed in the steel bars and each section of the grounding device, and the non-uniformity of the dispersion is affected by different factors. The dispersion of the grounding short-circuit current is a complex process.

[0003] In order to improve the grounding performance of the tower and reduce the grounding resistance of the grounding net of the transmission line tower, power industry experts have studied the methods and strategies for resistance reduction from various angles. The traditional resistance reduction methods include burying vertical grounding poles, introducing external grounding nets and extending grounding bodies. Such methods aim to increase the length of the deeply buried grounding poles and optimize the arrangement of the grounding poles. In actual grounding engineering, auxiliary resistance reduction materials are used for grounding resistance reduction of the grounding net of the transmission line tower. Some auxiliary resistance reduction materials have bottlenecks in long-term resistance reduction and technical economy.

[0004] Since the natural grounding of the tower foundation can reduce the difficulty of external extension construction, and the filling of the foundation pit of the transmission line tower occupies a large area, it is of high practical engineering application value to study the grounding resistance reduction method of the tower foundation. When the artificial grounding body is added for resistance reduction of the transmission tower, the lightning current flows through the steel bars and the grounding device, and the dispersion is not uniform due to the influence of different factors. Reducing the grounding resistance of the grounding net of the tower and analyzing the dispersion law of the grounding device are important foundations for the optimal design of the grounding of the transmission line tower. Therefore, it is of great significance to study a device that can fully play the dispersion role of the steel bars in the core of the tower foundation and improve the grounding performance of the tower foundation for the safe and stable operation of the power system. SUMMARY

[0005] The purpose of the present application is to overcome the defects and problems of poor resistance reduction effect in the prior art, and to provide a compact grounding device for transmission line tower and a construction method thereof, which has good resistance reduction effect, high reliability and simple construction.

[0006] In order to achieve the above object, the technical solution of the present application is: a compact grounding device for a power transmission line tower, comprising a ring-shaped pull ring fixed on the top of a pile foundation, an outer-coated surface electrode covering the outer side of the pile foundation, and a grounding down lead fixed on the top of the pile foundation, a plurality of pull rods are arranged on the ring-shaped pull ring along the circumferential direction of the ring-shaped pull ring, the plurality of pull rods are arranged in a character-shaped manner, the pull rod comprises an outer clamping groove, a first connecting rod and a second connecting rod, one end of the first connecting rod is connected with a hook for suspending the outer-coated surface electrode, the other end of the first connecting rod is clamped with one end of the outer clamping groove, the other end of the outer clamping groove is clamped with one end of the second connecting rod, the other end of the second connecting rod is connected with the ring-shaped pull ring, the grounding down lead is a grounding wire with a connecting nose, the connecting nose is connected with the tower leg or the grounding terminal row of the tower, and the grounding wire is attached to the outer-coated surface electrode.

[0007] The outer clamping groove is a cylindrical structure, a through groove penetrating through the two end faces of the outer clamping groove is formed in the inner part of the outer clamping groove, a plurality of circular grooves are uniformly formed in the inner part of the outer clamping groove along the axial direction of the outer clamping groove, the circular grooves are located on the outer peripheral part of the through groove and are communicated with the through groove.

[0008] The first connecting rod and the second connecting rod each comprise a cylindrical segment, one end of the cylindrical segment is connected with the hook, a protrusion is arranged on the outer wall of the other end of the cylindrical segment, the cylindrical segment can move axially along the inner wall of the through groove, and the protrusion is clamped with the circular groove.

[0009] A circular through groove is formed on the outer wall of the end of the cylindrical segment away from the protrusion, the hook comprises a hook body and a clamping block, and the tail part of the hook body is connected with the clamping block after penetrating through the circular through groove.

[0010] The first connecting rod and the second connecting rod further comprise a circular conical frustum segment, and one end of the cylindrical segment away from the protrusion is connected with the large-diameter end of the circular conical frustum segment.

[0011] The outer-coated surface electrode is a metal foil.

[0012] The outer-coated surface electrode is a cloth-shaped or blanket-shaped metal woven belt woven by stainless steel fibers.

[0013] The upper part, the middle part and the lower part of the outer periphery of the outer-coated surface electrode are bound by turns of straps.

[0014] The grounding wire comprises a first segment, a bending segment and a second segment, one end of the first segment is connected with the connecting nose, the other end of the first segment is connected with the second segment through the bending segment, and the bending segment is attached to the top of the pile foundation and the outer-coated surface electrode respectively.

[0015] The connecting nose comprises a mounting sleeve and a patch, the mounting sleeve is sleeved on the first segment, and the patch is connected with the tower leg or the grounding terminal row of the tower through the circular hole thereof.

[0016] A construction method of a compact grounding device of a power transmission line tower, the construction method comprising the following steps:

[0017] The annular pull ring is fixed on the top of the pile foundation, the plurality of pull rods are fixed on the annular pull ring and arranged in a rice-shaped array, the outer surface electrode is uniformly hung on the hook, the outer surface electrode is laid on the outer side of the pile foundation, the grounding down lead is fixed on the top of the pile foundation, the connecting nose is connected with the tower leg or the grounding terminal row of the tower, and the grounding wire is attached to the outer surface electrode.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1. In the compact grounding device of a power transmission line tower and the construction method thereof, the grounding device comprises an annular pull ring fixed on the top of the pile foundation, an outer surface electrode laid on the outer side of the pile foundation, and a grounding down lead fixed on the top of the pile foundation, the grounding down lead is a grounding wire with a connecting nose, the connecting nose is connected with the tower leg or the grounding terminal row of the tower, the grounding wire is attached to the outer surface electrode, a plurality of pull rods are arranged on the annular pull ring along the circumferential direction of the annular pull ring, the plurality of pull rods are arranged in a rice-shaped array, the pull rod comprises an outer clamping groove, a first connecting rod and a second connecting rod, one end of the outer clamping groove is connected with the hook for hanging the outer surface electrode through the first connecting rod, and the other end of the outer clamping groove is connected with the annular pull ring through the second connecting rod; the grounding device with the above structure not only improves the resistance reduction effect of the grounding device through the grounding down lead and the outer surface electrode, but also has high connection reliability between parts, in addition, after the concrete pile foundation is poured, the outer surface electrode can be uniformly laid on the outer side of the concrete pile foundation through the annular pull ring and the pull rod, so that the grounding device is easy to construct. Therefore, the present application has good resistance reduction effect, high reliability and easy construction.

[0020] 2、The compact grounding device for transmission line tower and the construction method thereof, the inside of the outer clamping groove is provided with a through groove penetrating the two end faces of the outer clamping groove, a plurality of circular grooves are uniformly arranged in the inside of the outer clamping groove along the axial direction of the outer clamping groove, the circular grooves are located at the outer peripheral part of the through groove and are communicated with the through groove, the first connecting rod and the second connecting rod each comprise a cylindrical segment, one end of the cylindrical segment is connected with the hook, and the outer wall of the other end of the cylindrical segment is provided with a protrusion; after the cylindrical segment is inserted into the through groove, the cylindrical segment can be axially moved along the inner wall of the through groove to achieve the effect of distance regulation; after the distance is regulated, the protrusion is clamped into the circular groove by rotating the cylindrical segment; the outer wall of the end of the cylindrical segment away from the protrusion is provided with a circular through groove, the hook comprises a hook body and a clamping block, and when assembled, the tail part of the hook body is connected with the clamping block after penetrating through the circular through groove, so that the installation and dismounting are convenient; the first connecting rod and the second connecting rod further comprise a conical table segment, the end of the cylindrical segment away from the protrusion is connected with the large-diameter end of the conical table segment, and the conical table segment is arranged to prevent the connecting rod from being completely inserted into the outer clamping groove and being unable to be pulled out, and to facilitate pulling out of the connecting rod. Therefore, the application is flexible to use, convenient to operate and high in reliability.

[0021] 3、The compact grounding device for transmission line tower and the construction method thereof, the outer surface electrode is a metal foil or a cloth-shaped or blanket-shaped metal woven belt woven by stainless steel fibers, so that the resistance reduction effect is good and the use is convenient; the upper part, the middle part and the lower part of the periphery of the outer surface electrode are bound by turns of bands, and the turns of bands are arranged to effectively solve the problem that the outer surface electrode cannot be completely vertically laid due to insufficient toughness. Therefore, the application has good resistance reduction effect and is convenient to use.

[0022] 4、The compact grounding device for transmission line tower and the construction method thereof, the grounding wire comprises a first section, a bent section and a second section, the wire nose comprises a mounting sleeve and a patch, the bent section is attached to the top of the pile foundation and the outer surface electrode respectively, the mounting sleeve is sleeved on the first section, and the patch is connected with the tower leg or the grounding terminal row of the tower through the circular hole in the patch. The grounding downlead with the above structure is not only easy to install, but also has a long service life. Therefore, the application is easy to install and has a long service life. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is an assembly structure schematic diagram in one view of the application.

[0024] Figure 2 is an assembly structure schematic diagram in another view of the application.

[0025] Figure 3 is Figure 1 a structure schematic diagram of the annular pull ring.

[0026] Figure 4 is Figure 1Structure diagram of the external surface electrode.

[0027] Figure 5 is Figure 1 Structure diagram of the ground wire of the ground down conductor.

[0028] Figure 6 is Figure 1 Structure diagram of the connecting nose of the ground down conductor.

[0029] Figure 7 is Figure 1 Structure diagram of the pull rod.

[0030] Figure 8 is Figure 7 Structure diagram of the external clamping groove.

[0031] Figure 9 is Figure 7 Structure diagram of the first connecting rod or the second connecting rod.

[0032] Figure 10 is Figure 7 Structure diagram of the hook.

[0033] Figure 11 is Figure 1 Structure diagram of the belt.

[0034] In the figure: pile foundation 1, annular pull ring 2, external surface electrode 3, ground down conductor 4, ground wire 41, first section 411, bending section 412, second section 413, connecting nose 42, mounting sleeve 421, patch 422, round hole 423, pull rod 5, external clamping groove 51, through groove 511, circular groove 512, first connecting rod 52, cylindrical section 521, protrusion 522, circular through groove 523, conical frustum section 524, second connecting rod 53, hook 54, hook body 541, clamping block 542, belt 6. DETAILED DESCRIPTION

[0035] The application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Reference is made to Figures 1 to 11The utility model provides a kind of transmission line tower compact grounding device, including annular pull ring 2 fixed in the top of pile foundation 1, outer coating surface electrode 3 covered in the outside of pile foundation 1 and ground down lead 4 fixed in the top of pile foundation 1, multiple pull rods 5 are arranged in the circumferential direction of the annular pull ring 2, multiple pull rods 5 are arranged in the shape of Chinese character, and the pull rod 5 includes outer clamping groove 51, first connecting rod 52 and second connecting rod 53, the one end of first connecting rod 52 is connected with the hook 54 for suspending outer coating surface electrode 3, the other end of first connecting rod 52 is clamped with the one end of outer clamping groove 51, the other end of outer clamping groove 51 is clamped with the one end of second connecting rod 53, the other end of second connecting rod 53 is connected with annular pull ring 2, and the ground down lead 4 is ground wire 41 with connecting nose 42, the connecting nose 42 is connected with the tower leg or ground terminal row of tower, and the ground wire 41 is attached with outer coating surface electrode 3.

[0037] The outer clamping groove 51 is cylindrical structure, and the inside of outer clamping groove 51 is provided with through groove 511 penetrating the two end faces of outer clamping groove 51, and multiple circular grooves 512 are uniformly provided in the inside of outer clamping groove 51 along its axial direction, the circular groove 512 is located in the outer peripheral portion of through groove 511 and is communicated with through groove 511.

[0038] The first connecting rod 52 and the second connecting rod 53 all include cylindrical section 521, one end of the cylindrical section 521 is connected with the hook 54, the outer wall of the other end of the cylindrical section 521 is provided with protrusion 522, the cylindrical section 521 can move axially along the inner wall of through groove 511, and the protrusion 522 is clamped with the circular groove 512.

[0039] The outer wall of the one end of the cylindrical section 521 away from the protrusion 522 is provided with circular through groove 523, the hook 54 includes hook body 541 and clamping block 542, and the tail of the hook body 541 is connected with the clamping block 542 after penetrating the circular through groove 523.

[0040] The first connecting rod 52 and the second connecting rod 53 also include conical frustum section 524, and the one end of the cylindrical section 521 away from the protrusion 522 is connected with the large-diameter end of the conical frustum section 524.

[0041] The outer coating surface electrode 3 is metal foil.

[0042] The outer coating surface electrode 3 is cloth or blanket-shaped metal woven belt woven by stainless steel fiber.

[0043] The upper part, the middle part and the lower part of the periphery of the outer coating surface electrode 3 are bound by band 6.

[0044] The ground wire 41 comprises a first section 411, a bent section 412 and a second section 413, one end of the first section 411 is connected with the connecting nose 42, the other end of the first section 411 is connected with the second section 413 through the bent section 412, and the bent section 412 is attached to the top of the pile foundation 1 and the outer surface electrode 3.

[0045] The connecting nose 42 comprises a mounting sleeve 421 and a patch 422, the mounting sleeve 421 is sleeved on the first section 411, and the patch 422 is connected with the tower leg or the grounding terminal row of the tower through the round hole 423.

[0046] A construction method of a compact grounding device of a power transmission line tower, the construction method comprises the following steps:

[0047] First, the annular pull ring 2 is fixed on the top of the pile foundation 1, then a plurality of pull rods 5 are fixed on the annular pull ring 2 and arranged in a Chinese character type array, then the outer surface electrode 3 is uniformly hung on the hook 54, then the outer surface electrode 3 is laid on the outer side of the pile foundation 1, then the grounding down lead 4 is fixed on the top of the pile foundation 1, and the connecting nose 42 is connected with the tower leg or the grounding terminal row of the tower, and the ground wire 41 is attached to the outer surface electrode 3.

[0048] The principle of the present application is described as follows:

[0049] The design relates to the safety grounding protection of a tower when a fault current enters the ground through a concrete pile foundation of a power transmission line tower during a lightning stroke accident of a power transmission line. The design has the advantages of obvious resistance reduction effect, safety and reliability, strong universality, simple construction, flexible operation, no need of professional tools for mounting and dismounting, full realization of effective connection between parts, good corrosion resistance, good applicability, and advantages of saving land excavation amount.

[0050] (1) The hook is mainly used for suspending the vertically laid flexible outer surface electrode, so that the flexible outer surface electrode can be uniformly laid around the pile foundation.

[0051] (2) The outer slot is in the shape of a cylinder, the surface of the cylinder is smooth, and a through slot in the shape of a "keyhole" is formed in the cylinder, and the cylinder looks like a "keyhole" at both ends; when the direction of the connecting rod coincides with the through slot, the connecting rod can be freely stretched to achieve the effect of distance regulation; 12 circular slots with equal spacing are formed in the cylinder, and after the distance is regulated, the connecting rod is rotated and clamped into the circular slot to control the overall length of the pull rod.

[0052] (3) One end of the connecting rod has a round table-shaped protrusion. One function is to prevent the entire connecting rod from entering the outer card slot and being unable to be pulled out, and the other is to facilitate the pulling of the connecting rod. There is a circular through groove near the round table-shaped protrusion for suspending the hook. The other end of the connecting rod has a protrusion similar to a cuboid shape, which combines with the whole connecting rod to form a key shape. This end is the end that enters the outer card slot and matches the "keyhole".

[0053] (4) The pull rod is assembled by the above-mentioned hook, outer card slot, and connecting rod. The problem solved is that during the construction of the grounding grid of transmission line towers, the flexible outer coating electrode can be vertically suspended and evenly laid around the pile foundation. In the grounding ditch at the construction site, the distance between the suspended flexible outer coating electrode and the pile foundation in the parallel direction can be controlled. This pull rod can not only achieve arbitrary control in the horizontal interval direction but also control the interval distance, and has the advantages of simple operation, flexible use, and low cost.

[0054] (5) The annular pull ring is fixed on the top of the pile foundation, and its function is to fix the "rice"-shaped arranged pull rods on the top of the pile foundation. The top of the pull rod has a circular through groove, and the annular pull ring can pass through its top through groove to play a fixing role.

[0055] (6) The outer coating electrode is a conductive material covering the outside of the tower concrete pile foundation. The outer coating electrode is preferably selected from the following 2 categories: The first category: metal foils with anti-corrosion properties, generally with a thickness of less than 0.4 mm, which can be flexibly bent according to the shape of the concrete pile foundation, and are overall flexible and rollable materials, such as copper foil, stainless steel foil, copper-plated steel foil, etc.; The second category: woven metal conductive materials with anti-corrosion properties, generally with a thickness of less than 3 mm, which are metal woven belts in the form of cloth or blanket woven from stainless steel fibers, including copper fiber woven cloth, stainless steel fiber woven cloth, etc.; Their width and length can be arbitrarily cut, and the metal woven belt suitable for the outside of the tower concrete pile foundation is generally single-layer.

[0056] After the tower concrete pile foundation is poured and solidified, the conductive material is evenly wrapped around the outside of the concrete pile foundation, and crimping is maintained at the edge of the external material, and the crimping length is greater than or equal to 10 cm. After the outer coating electrode is bent, it conforms to the shape of the tower concrete pile foundation, and the two are closely fitted. The outer layer of the outer coating electrode is backfilled soil.

[0057] (7) The turnbuckle is mainly tied around the periphery of the cylindrical outer coating electrode to achieve the function of fixing the outer coating electrode. This grounding device uses 3 turnbuckles, which are tied to the upper, middle, and lower parts of the flexible outer coating electrode respectively, and can effectively solve the problem that the flexible outer coating electrode cannot be completely vertically laid due to insufficient toughness.

[0058] (8) The grounding downlead is a grounding wire with a connection nose. The connection nose is connected to the tower leg of the pole tower or the grounding terminal row to achieve a firm connection between the grounding downlead and the transmission line pole tower. To prevent the oxygen concentration difference corrosion problem of the grounding downlead near the bottom surface, waterproof paint or asphalt waterproof layer can be coated at the grounding point of the downlead to extend the service life of the grounding downlead. The round hole diameter of the connection nose is 12 mm.

[0059] When preparing the above components, the composition materials of each part are as follows: The materials for the outer card slot and the connecting rod should be selected as non-metallic materials that are insulating and cost-effective, such as synthetic resin, nylon and other materials; The annular pull ring is prepared from sealing materials with certain anti-aging properties, such as rubber, silicone rubber, etc.; The flexible outer敷面状 electrode should preferably be made of flexible conductive materials with strong corrosion resistance, such as copper foil, stainless steel foil, copper-clad steel foil, copper fiber woven cloth, stainless steel fiber woven cloth, etc.; The grounding downlead can be galvanized steel, carbon steel, stainless steel, copper-clad steel, copper, graphite composite grounding body, etc.

[0060] When installing the compact grounding device for the transmission line pole tower, first fix the annular pull ring on the pile foundation, then hang the pull rods through their top through slots on the annular pull ring respectively, and arrange the pull rods in a "rice" shape array, which can achieve 360-degree all-round vertical suspension of the flexible outer敷面状 electrode. The number of pull rods can also be appropriately selected according to the construction needs. Then evenly hang the flexible outer敷面状 electrode on the hooks. After the flexible outer敷面状 electrode is laid, the construction personnel tie the turn belts to the upper, middle and lower parts of the flexible outer敷面状 electrode respectively. After ensuring that the flexible outer敷面状 electrode is effectively fixed, the construction of the grounding device is completed.

[0061] Example 1:

[0062] See Figures 1 to 11 , a compact grounding device for a transmission line pole tower, including an annular pull ring 2 fixed on the top of the pile foundation 1, an outer敷面状 electrode 3 covering the outside of the pile foundation 1, and a grounding downlead 4 fixed on the top of the pile foundation 1. A plurality of pull rods 5 are arranged along the circumferential direction of the annular pull ring 2, and the plurality of pull rods 5 are arranged in a "rice" shape. The pull rod 5 includes an outer card slot 51, a first connecting rod 52 and a second connecting rod 53. One end of the first connecting rod 52 is connected with a hook 54 for hanging the outer敷面状 electrode 3. The other end of the first connecting rod 52 is clamped with one end of the outer card slot 51. The other end of the outer card slot 51 is clamped with one end of the second connecting rod 53. The other end of the second connecting rod 53 is connected with the annular pull ring 2. The grounding downlead 4 is a grounding wire 41 with a connection nose 42, and the connection nose 42 is connected to the tower leg of the pole tower or the grounding terminal row. The grounding wire 41 is in contact with the outer敷面状 electrode 3; The outer敷面状 electrode 3 is a metal foil, or the outer敷面状 electrode 3 is a cloth-like or blanket-like metal woven belt woven from stainless steel fibers. It should be noted that there may be some inaccuracies in the translation due to the unclear "外敷面状电极" in the original text. It is recommended to check and correct it according to the actual situation.

[0063] According to the above scheme, the construction method of the compact grounding device of the transmission line tower, the construction method comprises the following steps: first, fixing the annular pull ring 2 on the top of the pile foundation 1, then fixing a plurality of pull rods 5 on the annular pull ring 2, and arranging the plurality of pull rods 5 in a horizontal array, then uniformly hanging the outer surface electrode 3 on the hook 54, then laying the outer surface electrode 3 on the outer side of the pile foundation 1, then fixing the grounding down lead 4 on the top of the pile foundation 1, and connecting the wire nose 42 with the tower leg or the grounding terminal row of the tower, and the grounding wire 41 is in contact with the outer surface electrode 3.

[0064] Example 2:

[0065] The basic content is the same as that of example 1, except that:

[0066] Referring to Figure 1 , Figure 2 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , the outer clamping groove 51 is a cylindrical structure, the inside of the outer clamping groove 51 is provided with a through groove 511 penetrating through the two end faces of the outer clamping groove 51, and a plurality of circular grooves 512 are uniformly provided in the inside of the outer clamping groove 51 along the axial direction thereof, the circular grooves 512 are located at the outer peripheral part of the through groove 511 and communicate with the through groove 511; the first connecting rod 52 and the second connecting rod 53 each comprise a cylindrical segment 521, one end of the cylindrical segment 521 is connected with the hook 54, the outer wall of the other end of the cylindrical segment 521 is provided with a protrusion 522, the cylindrical segment 521 can move axially along the inner wall of the through groove 511, and the protrusion 522 is clamped with the circular groove 512; a circular through groove 523 is formed in the outer wall of the end of the cylindrical segment 521 away from the protrusion 522, the hook 54 comprises a hook body 541 and a clamping block 542, the tail of the hook body 541 passes through the circular through groove 523 and is connected with the clamping block 542; the first connecting rod 52 and the second connecting rod 53 further comprise a conical frustum segment 524, and the end of the cylindrical segment 521 away from the protrusion 522 is connected with the large-diameter end of the conical frustum segment 524.

[0067] Example 3:

[0068] The basic content is the same as that of example 1, except that:

[0069] Referring to Figure 1 , Figure 2 , Figure 4 , Figure 11 , the upper part, the middle part and the lower part of the outer surface electrode 3 are bundled by the band 6.

[0070] Example 4:

[0071] The basic content is the same as that of Example 1, except that:

[0072] Referring to Figure 1 , Figure 2 , Figure 5 , Figure 6 The grounding wire 41 comprises a first section 411, a bent section 412 and a second section 413. One end of the first section 411 is connected with the wiring nose 42, and the other end of the first section 411 is connected with the second section 413 through the bent section 412. The bent section 412 is respectively attached to the top of the pile foundation 1 and the outer surface electrode 3. The wiring nose 42 comprises a mounting sleeve 421 and a patch 422. The mounting sleeve 421 is sleeved on the first section 411. The patch 422 is connected with the tower leg or the grounding terminal row of the tower through the circular hole 423.

Claims

1. A compact grounding device for a power transmission line tower, characterized by, The utility model relates to a kind of pile foundation grounding electrode, including annular pull ring (2) fixed on the top of pile foundation (1), outer-applied surface electrode (3) covered on the outside of pile foundation (1) and ground down lead (4) fixed on the top of pile foundation (1), multiple pull rods (5) are provided on the annular pull ring (2) along its circumferential direction, multiple pull rods (5) are arranged in rice character, and the pull rod (5) includes outer clamping groove (51), first connecting rod (52) and second connecting rod (53), one end of the first connecting rod (52) is connected with the hook (54) for hanging outer-applied surface electrode (3), the other end of first connecting rod (52) is clamped with one end of outer clamping groove (51), the other end of outer clamping groove (51) is clamped with one end of second connecting rod (53), the other end of second connecting rod (53) is connected with annular pull ring (2), and the ground down lead (4) is ground wire (41) with connecting nose (42), the connecting nose (42) is connected with tower leg or ground terminal row of tower, and the ground wire (41) is attached with outer-applied surface electrode (3); The outer clamping groove (51) is cylindrical structure, and the inside of outer clamping groove (51) is provided with through groove (511) penetrating the two end faces of outer clamping groove (51), and multiple circular grooves (512) are evenly provided in the inside of outer clamping groove (51) along its axial direction, the circular groove (512) is located in the outer peripheral part of through groove (511) and is communicated with through groove (511);The first connecting rod (52) and the second connecting rod (53) all include cylindrical segment (521), one end of the cylindrical segment (521) is connected with the hook (54), the outer wall of the other end of the cylindrical segment (521) is provided with protrusion (522), the cylindrical segment (521) can move axially along the inner wall of through groove (511), and the protrusion (522) is clamped with the circular groove (512); The outer wall of one end of the cylindrical segment (521) away from the protrusion (522) is provided with circular through groove (523), and the hook (54) includes hook body (541) and clamping block (542), and the tail of the hook body (541) is connected with the clamping block (542) after penetrating the circular through groove (523); The first connecting rod (52) and the second connecting rod (53) further include circular conical frustum segment (524), and one end of the cylindrical segment (521) away from the protrusion (522) is connected with the large-diameter end of the circular conical frustum segment (524); The outer-applied surface electrode (3) is cloth or blanket-shaped metal woven belt woven by metal foil or stainless steel fiber;The upper part, the middle part and the lower part of the periphery of outer-applied surface electrode (3) are bound by turn band (6). The ground wire (41) comprises a first section (411), a bent section (412) and a second section (413), one end of the first section (411) is connected with the connecting nose (42), the other end of the first section (411) is connected with the second section (413) through the bent section (412), the bent section (412) is respectively attached to the top of the pile foundation (1) and the outer surface electrode (3); the connecting nose (42) comprises a mounting sleeve (421) and a patch (422), the mounting sleeve (421) is sleeved on the first section (411), and the patch (422) is connected with the tower leg or the grounding terminal row of the tower through the circular hole (423) thereof.

2. A method of constructing the compact grounding device for a power transmission line tower according to claim 1, characterized by: The construction method comprises the following steps: First, the annular pull ring (2) is fixed on the top of the pile foundation (1), then a plurality of pull rods (5) are fixed on the annular pull ring (2), and the plurality of pull rods (5) are arranged in a Chinese character type array, then the outer surface electrode (3) is uniformly hung on the hook (54), then the outer surface electrode (3) is laid on the outer side of the pile foundation (1), then the grounding down lead (4) is fixed on the top of the pile foundation (1), and the connecting nose (42) is connected with the tower leg or the grounding terminal row of the tower, and the ground wire (41) is attached to the outer surface electrode (3).

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