Cable terminal leading-down structure reconstructed based on built overhead transmission line

Abstract

The utility model relates to the technical field of high-voltage power transmission lines, in particular to a cable terminal leading-down structure based on reconstruction of a built overhead power transmission line, which comprises a built steel pipe pole main pole, a cable terminal equipment cross arm, a first cable clamp cross arm and a second cable clamp cross arm. A ground wire cross arm and a plurality of wire cross arms are arranged on the built steel pipe pole main pole; the wire cross arms comprise an upper wire cross arm, a middle wire cross arm and a lower wire cross arm; an upper wire leading-down cross arm is arranged at the end part of the upper wire cross arm, and a middle wire leading-down cross arm is arranged at the end part of the middle wire cross arm; the cable terminal device cross arm is provided with a cable terminal base, a lightning arrester base and an inversely-hung insulator string hanging plate. The cable terminal leading-down structure provided by the utility model is rebuilt based on the built overhead transmission line steel pipe pole, an old tower does not need to be dismantled, a new tower does not need to be newly built, the occupied area does not need to be increased, the construction cost is greatly reduced, and the problems that an urban corridor is narrow, underground pipelines are numerous, and the cable terminal tower is difficult to be newly built are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to high -voltage transmission line technical field, concretely relates to a kind of cable terminal downlead structure based on the reconstruction of built overhead transmission line. BACKGROUND

[0002] The existing overhead transmission line terminal steel pipe pole is transformed into cable terminal pole, generally adopts the mode of replacement of newly-built new tower or the mode of newly-added cable platform on ground. The cable terminal pole in the first mode needs to newly build tower, and the reconstruction period is long and the cost is high. The cable terminal pole in the second mode needs to increase large ground area, and it is difficult to meet the operation demand in the limited area of city roadside or green belt, and there are many underground pipelines in city, which involves pipeline relocation, and the implementation scheme cost is high and the period is long.

[0003] In summary, it is urgent to provide a kind of cable terminal downlead structure based on the reconstruction of built overhead transmission line to solve the technical problems existing in the prior art. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of cable terminal downlead structure based on the reconstruction of built overhead transmission line to solve the technical problems existing in the prior art, and the specific technical scheme is as follows:

[0005] A kind of cable terminal downlead structure based on the reconstruction of built overhead transmission line, including built steel pipe pole main pole, cable terminal equipment cross arm, first cable clamp cross arm, second cable clamp cross arm;

[0006] The ground wire cross arm and multiple conductor cross arms are sequentially arranged on the built steel pipe pole main pole from top to bottom, and the conductor cross arm includes upper conductor cross arm, middle conductor cross arm and lower conductor cross arm;

[0007] The end of the upper conductor cross arm is provided with upper conductor downlead cross arm, and the end of the middle conductor cross arm is provided with middle conductor downlead cross arm;

[0008] The cable terminal equipment cross arm is arranged on the built steel pipe pole main pole by locking assembly and located below the conductor cross arm. The cable terminal equipment cross arm is provided with cable terminal base, lightning arrester base and inverted insulator string hanging plate;

[0009] The first cable clamp cross arm and the second cable clamp cross arm are sequentially arranged on the built steel pipe pole main pole from top to bottom and located below the cable terminal equipment cross arm.

[0010] Further, the projection of the upper conductor downlead cross arm and the middle conductor downlead cross arm on horizontal plane is perpendicular to each other.

[0011] Further, the cable terminal device crosspieces are provided in plurality, and the plurality of cable terminal device crosspieces are arranged along the circumferential direction of the main pole of the built steel pipe pole; the included angle between two adjacent cable terminal device crosspieces is 40-50 degrees.

[0012] Further, a platform plate is arranged between two adjacent cable terminal device crosspieces, and the platform plate forms an independent maintenance platform.

[0013] Further, the first cable clamp crosspieces are provided in plurality, and the plurality of first cable clamp crosspieces are arranged along the circumferential direction of the main pole of the built steel pipe pole; the plurality of first cable clamp crosspieces correspond to the cable terminal device crosspieces one by one.

[0014] The second cable clamp crosspieces are provided in plurality, and the plurality of second cable clamp crosspieces are arranged along the circumferential direction of the main pole of the built steel pipe pole; the plurality of second cable clamp crosspieces correspond to the plurality of first cable clamp crosspieces one by one.

[0015] The first cable clamp crosspieces and the second cable clamp crosspieces are provided with clamp bases, and the clamp bases are provided with cable clamps.

[0016] Further, at least one of the cable terminal device crosspieces, the first cable clamp crosspieces and the second cable clamp crosspieces is consistent with the direction of the upper wire crosspiece / middle wire crosspiece.

[0017] Further, the locking assembly comprises a hoop assembly I, the hoop assembly I comprises two polygonal hoops, the inner surfaces of the polygonal hoops are matched with the polygonal cross section of the main pole of the built steel pipe pole, and the two polygonal hoops are locked by bolts to form a hoop structure.

[0018] Further, the hoop assembly I is provided with a plurality of mounting grooves, and the mounting grooves are matched with the cable terminal device crosspieces, the first cable clamp crosspieces or the second cable clamp crosspieces.

[0019] Further, the utility model further comprises a movable crawling ladder, and the movable crawling ladder is connected with the main pole of the built steel pipe pole through an adjustable connecting piece.

[0020] Further, the adjustable connecting piece comprises a U-shaped clamp and a long bolt, the U-shaped clamp is locked and connected with the movable crawling ladder through the long bolt, and the U-shaped clamp is fixedly connected with the main pole of the built steel pipe pole.

[0021] The technical scheme of the utility model has the following beneficial effects:

[0022] (1)The utility model provides a kind of cable terminal downlead structure based on the reconstruction of built overhead transmission line, including built steel pipe pole main pole, cable terminal equipment cross arm, first cable clamp cross arm, second cable clamp cross arm;The built steel pipe pole main pole is sequentially provided with ground wire cross arm and multiple conductor cross arms from top to bottom, and the conductor cross arm includes upper conductor cross arm, middle conductor cross arm and lower conductor cross arm;The end of the upper conductor cross arm is provided with upper conductor downlead cross arm, and the end of the middle conductor cross arm is provided with middle conductor downlead cross arm;The cable terminal equipment cross arm is arranged on the built steel pipe pole main pole by locking assembly and is located below the conductor cross arm;Cable terminal base, lightning arrester base and inverted insulator string hanging plate are installed on the cable terminal equipment cross arm;The first cable clamp cross arm and the second cable clamp cross arm are sequentially arranged on the built steel pipe pole main pole from top to bottom and are located below the cable terminal equipment cross arm.The cable terminal downlead structure provided by the utility model is reconstructed based on the built overhead transmission line steel pipe pole, only removes the redundant conductor cross arm on the built overhead transmission line steel pipe pole and the original ladder, without removing old tower, newly building new tower, without increasing land area, greatly reduces construction cost, solves the problem of narrow city corridor, numerous underground pipelines and difficulty in newly building cable terminal tower.

[0023] (2)In the utility model, platform plate is arranged between adjacent two cable terminal equipment cross arms, and the platform plate forms an independent maintenance platform, so as to facilitate later maintenance operation.

[0024] (3)In the utility model, the adjustable connecting piece includes U-shaped clamp and long bolt, the U-shaped clamp is matched with the center circular pipe and is locked by the long bolt, and the U-shaped clamp is fixedly connected with the connecting plate of the built steel pipe pole main pole by bolt; the installation position of the movable ladder can be adjusted by arranging the adjustable connecting piece, so as to meet actual operation demand; in addition, the U-shaped clamp is first locked and connected with the center circular pipe, and then is connected with the built steel pipe pole main pole, so as to solve the problem of installation difficulty caused by inaccurate size measurement and insufficient machining and welding precision, reduce the requirement for machining precision, and improve installation efficiency.

[0025] In addition to the purposes, characteristics and advantages described above, the utility model has other purposes, characteristics and advantages. The utility model will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings forming part of the utility model serve to provide further understanding of the utility model, and the illustrative embodiment of the utility model and its description serve to explain the utility model, and do not constitute undue limitation on the utility model. In the drawings:

[0027] Figure 1 It is the schematic view of the cable terminal downlead structure based on the reconstruction of built overhead transmission line in the utility model.

[0028] Figure 2 is a side view of Figure 1 ;

[0029] Figure 3 is a cross-sectional view of A-A in Figure 1 ;

[0030] Figure 4 is a cross-sectional view of B-B in Figure 1 ;

[0031] Figure 5 is a cross-sectional view of C-C in Figure 1 ;

[0032] Figure 6 is a cross-sectional view of D-D in Figure 1 ;

[0033] Figure 7 is a cross-sectional view of E-E in Figure 1 ;

[0034] Figure 8 is a top view of the connection of the cable terminal device cross arm and the main pole of the built steel pipe pole;

[0035] Figure 9 is a front view of Figure 8 ;

[0036] Figure 10 is a top view of the connection of the end of the upper wire cross arm and the down lead cross arm of the upper wire;

[0037] Figure 11 is a cross-sectional view of Figure 10 ;

[0038] Figure 12 is a structural view of the movable ladder stand;

[0039] Figure 13 is a view of the connection of the movable ladder stand and the main pole of the built steel pipe pole;

[0040] Figure 14 is a structural view of the adjustable connector;

[0041] Wherein, 1, the main pole of the built steel pipe pole, 1.1, the upper conductor cross arm, 1.2, the middle conductor cross arm, 1.3, the lower conductor cross arm, 1.4, the excess conductor cross arm, 2, the upper conductor down lead cross arm, 3, the middle conductor down lead cross arm, 4, the cable terminal device cross arm, 4.1, the cable terminal base, 4.2, the lightning arrester base, 5, the locking assembly, 5.1, the polygon hoop one, 5.2, the polygon hoop two, 6, the first cable clamp cross arm, 7, the second cable clamp cross arm, 8, the clamp base, 9, the movable ladder, 9.1, the central circular tube, 9.2, the transverse tube, 10, the adjustable connecting piece, 10.1, the U-shaped clamp, 10.2, the long bolt, 11, the platform plate, 12, the hoop assembly two. DETAILED DESCRIPTION

[0042] The embodiments of the present application will be described in detail below with reference to the drawings, but the present application can be implemented in various different ways as defined and covered.

[0043] In the description of the present application, it should be explained that the directions or position relations indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", "transverse", "longitudinal" and the like are based on the directions or position relations shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the indicated devices or elements to have a specific direction, to be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.

[0044] In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0045] Embodiment:

[0046] Referring to Figure 1 and Figure 2 The embodiment provides a cable terminal down lead structure based on the built overhead transmission line reconstruction, which comprises a built steel pipe pole main pole 1, a cable terminal device cross arm 4, a first cable clamp cross arm 6 and a second cable clamp cross arm 7.

[0047] The ground wire cross arm and a plurality of conductor cross arms are sequentially arranged on the built steel pipe pole main pole 1 from top to bottom, and the conductor cross arms comprise an upper conductor cross arm 1.1, a middle conductor cross arm 1.2 and a lower conductor cross arm 1.3.

[0048] The end of the upper conductor cross arm 1.1 is connected with the upper conductor down lead cross arm 2 through the hoop assembly two 12, and the end of the middle conductor cross arm 1.2 is connected with the middle conductor down lead cross arm 3 through the hoop assembly two 12.

[0049] In the embodiment, the upper conductor down lead cross arm 2 and the middle conductor down lead cross arm 3 are arranged along the horizontal direction, and preferably, the projections of the upper conductor down lead cross arm 2 and the middle conductor down lead cross arm 3 on the horizontal plane are perpendicular to each other; in the embodiment, referring to Figure 6 and Figure 7 , the upper conductor down lead cross arm 2 is arranged perpendicularly to the upper conductor cross arm 1.1 in the horizontal plane, and the middle conductor down lead cross arm 3 is arranged along the extension direction of the middle conductor cross arm 1.2, so as to prevent the upper conductor and the lower conductor from affecting each other in the down lead path.

[0050] In the embodiment, the upper conductor cross arm 1.1 and the upper conductor down lead cross arm 2 are connected through the hoop assembly two 12, and the middle conductor cross arm 1.2 and the middle conductor down lead cross arm 3 are connected through the hoop assembly two 12; the hoop assembly two 12 is arranged on the upper conductor cross arm 1.1 and the middle conductor cross arm 1.2 respectively, and a connecting flange is arranged on the hoop assembly two 12; the connecting flange is connected with the upper conductor down lead cross arm 2 / middle conductor down lead cross arm 3 through bolts, referring to Figure 10 and Figure 11 .

[0051] In the embodiment, referring to Figures 1-3 and Figure 8 and Figure 9 , the cable terminal device cross arm 4 is connected with the built steel pipe pole main pole 1 through the locking assembly 5, and the cable terminal device cross arm 4 is located below the lower conductor cross arm 1.3; the cable terminal device cross arm 4 is installed with a cable terminal base 4.1, an arrester base 4.2 and a hanging insulator string hanging plate; correspondingly, the cable terminal base 4.1 is provided with a cable terminal, the arrester base 4.2 is installed with an arrester, and the hanging insulator string hanging plate is installed with a hanging insulator string; in the embodiment, the cable terminal device cross arm 4 is provided with three, and the three cable terminal device cross arms 4 are arranged along the circumference of the built steel pipe pole main pole 1; the included angle between adjacent two cable terminal device cross arms 4 is 40°-50°, and preferably 45°; the cable terminal base 4.1, the arrester base 4.2 and the hanging insulator string hanging plate are symmetrically arranged on the adjacent two cable terminal device cross arms 4 respectively.

[0052] As a preferred technical solution, one cable terminal device cross arm 4 located in the middle is arranged in the same direction as the conductor cross arm.

[0053] In the embodiment, referring to Figure 3, adjacent two cable terminal equipment cross arms 4 are provided with platform plates 11, the platform plates 11 form independent maintenance platforms, and facilitate later maintenance operation.

[0054] Referring to Figure 1 , the first cable clamp cross arm 6 and the second cable clamp cross arm 7 are sequentially arranged on the built steel pipe pole main pole 1 from top to bottom through the locking assembly 5, and the first cable clamp cross arm 6 and the second cable clamp cross arm 7 are located below the cable terminal equipment cross arm 4; in the embodiment, referring to Figure 4 and Figure 5 , the first cable clamp cross arm 6 is provided with three, the three first cable clamp cross arms 6 are circumferentially arranged along the built steel pipe pole main pole 1, and the three first cable clamp cross arms 6 correspond to the cable terminal equipment cross arm 4 one by one in the vertical direction; the middle first cable clamp cross arm 6 is consistent with the direction of the wire cross arm;

[0055] The second cable clamp cross arm 7 is provided with three, the three second cable clamp cross arms 7 are circumferentially arranged along the built steel pipe pole main pole 1, and the plurality of second cable clamp cross arms 7 correspond to the plurality of first cable clamp cross arms 6 one by one in the vertical direction; the middle second cable clamp cross arm 7 is consistent with the direction of the wire cross arm;

[0056] In the embodiment, referring to Figure 4 and Figure 5 , the end of the plurality of first cable clamp cross arms 6 is provided with a clamp base 8, and the pole body of the plurality of second cable clamp cross arms 7 is symmetrically provided with a clamp base 8; the clamp base 8 is provided with a cable clamp for fixing the cable.

[0057] In the embodiment, referring to Figure 8 and Figure 9 , the locking assembly 5 includes a hoop assembly one, the hoop assembly one includes a polygon hoop one 5.1 and a polygon hoop two 5.2, the inner surfaces of the polygon hoop one 5.1 and the polygon hoop two 5.2 match the polygonal cross section of the built steel pipe pole main pole 1, and the two polygon hoops are locked through bolts to form a surrounding structure.

[0058] Under the action of the weight G1 of the cable terminal equipment cross arm 4 device and the self weight G2 of the cable terminal equipment cross arm 4, an extrusion force F1 is respectively generated on the upper end of the polygon hoop one 5.1 and the lower end of the polygon hoop two 5.2, the polygon hoop one 5.1 and the polygon hoop two 5.2 are in full contact with the built steel pipe pole main pole 1, the contact area is H1*a, H1 is the contact height of the locking assembly, a is the side length of the polygon hoop contact surface with the built steel pipe pole main pole, and the value of H1 is obtained by the following formula:

[0059] G1*L1+G2*L2=F1*H1 Formula 1)

[0060] G1+G2=F1*H1*a*μ Formula 2)

[0061] Wherein, L1, L2 are force arms from equipment on cable terminal equipment cross arm and cross arm barycenter to main pole of built steel pipe pole, a is side length of contact surface of polygonal hoop and main pole of built steel pipe pole, μ is static friction coefficient.

[0062] The contact height of the locking assembly 5 is calculated by the above method, which ensures the contact area of the polygonal hoop and the main pole of the built steel pipe pole, and further ensures the reliability of the installation of the cable terminal equipment cross arm 4, and meets the actual operation requirements.

[0063] In the embodiment, referring to Figure 8 and Figure 9 , the polygonal hoop 5.2 is provided with a plurality of installation grooves matched with the cable terminal equipment cross arm 4, the first cable clamp cross arm 6 or the second cable clamp cross arm 7.

[0064] In the embodiment, referring to Figure 1 , Figures 12-14 , the embodiment further comprises a movable ladder 9 connected with the main pole 1 of the built steel pipe pole through an adjustable connecting piece 10.

[0065] In the embodiment, referring to Figures 12-14 , the movable ladder 9 comprises a central circular pipe 9.1 and transverse pipes 9.2 staggered on opposite sides of the central circular pipe 9.1; the adjustable connecting piece 10 comprises a U-shaped clamp 10.1 and a long bolt 10.2, the U-shaped clamp 10.1 is matched with the central circular pipe 9.1 and locked through the long bolt 10.2; the U-shaped clamp 10.1 is fixedly connected with the connecting plate of the main pole 1 of the built steel pipe pole through a bolt; the installation position of the movable ladder 9 can be adjusted through the adjustable connecting piece 10, which meets the actual operation requirements. In addition, the U-shaped clamp 10.1 is first locked and connected with the central circular pipe 9.1, and then connected with the main pole 1 of the built steel pipe pole, which can solve the problem of installation difficulty caused by inaccurate size taking and insufficient welding precision, reduce the requirement for processing precision, and improve the installation efficiency.

[0066] The specific steps of reconstructing the cable terminal downlead structure based on the built overhead transmission line are as follows:

[0067] Step S1, remove the excess conductor cross arm 1.4 on the main pole 1 of the built steel pipe pole;

[0068] Step S2, add an upper conductor downlead cross arm 2 at the end of the upper conductor cross arm 1.1, and add a middle conductor downlead cross arm 3 at the end of the middle conductor cross arm 1.2;

[0069] Step S3, the newly added cable terminal equipment cross arm 4 is connected with the built steel pipe pole main rod 1 through the locking assembly 5; the cable terminal base 4.1, the lightning arrester base 4.2 and the inverted insulator string hanging plate are installed on the cable terminal equipment cross arm 4;

[0070] Step S4, the first cable clamp cross arm 6 and the second cable clamp cross arm 7 are sequentially installed on the built steel pipe pole main rod 1 along the height direction through the locking assembly 5, and the first cable clamp cross arm 6 and the second cable clamp cross arm 7 are located below the cable terminal equipment cross arm 4; the end portion of the first cable clamp cross arm 6 is provided with a clamp base 8, and the rod body of the second cable clamp cross arm 7 is provided with a clamp base 8; the clamp base 8 is provided with a cable clamp;

[0071] Step S5, the upper wire is led to the inverted insulator string on the cable terminal equipment cross arm 4 through the upper wire lead-down cross arm 2, the middle wire is led to the inverted insulator string through the middle wire lead-down cross arm 3, and the lower wire is directly led to the inverted insulator string and connected to the cable terminal and the lightning arrester;

[0072] Step S6, the underground cable is vertically led to the cable terminal base 4.1 through the cable clamp on the first cable clamp cross arm 6 and the second cable clamp cross arm 7;

[0073] Step S7, the climbing ladder interfering with the locking assembly 5 is removed and replaced with a movable climbing ladder 9.

[0074] The cable terminal lead-down structure provided by the utility model is based on the built overhead transmission line steel pipe pole and is reformed, without removing the old tower, building a new tower, without increasing the occupied area, and greatly reducing the construction cost, so that the problems of narrow urban corridor, numerous underground pipelines and difficulty in building a new cable terminal tower are solved.

[0075] The above only describes the preferred embodiments of the utility model and is not used to limit the utility model, and for those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A cable terminal downlead structure based on a built overhead transmission line reconstruction, characterized by, The built steel pipe pole main pole, the cable terminal device cross arm, the first cable clamp cross arm, and the second cable clamp cross arm are arranged in sequence from top to bottom. The upper conductor cross arm is provided with an upper conductor down lead cross arm at the end thereof. The cable terminal device cross arm is arranged on the built steel pipe pole main pole through a locking assembly and is located below the conductor cross arm. The first cable clamp cross arm and the second cable clamp cross arm are arranged in sequence from top to bottom on the built steel pipe pole main pole and are located below the cable terminal device cross arm. The upper conductor down lead cross arm and the middle conductor down lead cross arm are perpendicular to each other in the horizontal plane.

2. The cable termination and grounding structure based on a built overhead transmission line according to claim 1, characterized in that, The cable terminal device cross arm is provided with a plurality of cable terminal device cross arms which are arranged along the circumference of the built steel pipe pole main pole.

3. The cable termination and grounding structure based on a built overhead transmission line according to claim 1, characterized in that, The first cable clamp cross arm is provided with a plurality of first cable clamp cross arms which are arranged along the circumference of the built steel pipe pole main pole and are in one-to-one correspondence with the cable terminal device cross arms.

4. The cable termination and grounding structure based on a built overhead transmission line according to claim 3, characterized in that, The second cable clamp cross arm is provided with a plurality of second cable clamp cross arms which are arranged along the circumference of the built steel pipe pole main pole and are in one-to-one correspondence with the first cable clamp cross arms.

5. The cable termination and grounding structure based on a built overhead transmission line according to claim 3, characterized in that, The first cable clamp cross arm and the second cable clamp cross arm are provided with a clamp base, and the clamp base is provided with a cable clamp. The locking assembly comprises a hoop assembly one, the hoop assembly one comprises two pieces of polygonal hoops, the inner surfaces of the polygonal hoops are matched with the polygonal cross section of the built steel pipe pole main pole, and the two pieces of polygonal hoops are locked through bolts to form a ring structure. The hoop assembly one is provided with a plurality of mounting grooves which are matched with the cable terminal device cross arm, the first cable clamp cross arm or the second cable clamp cross arm.

6. The cable termination and grounding structure based on a built overhead transmission line according to claim 5, characterized in that, The adjustable connecting piece comprises a U-shaped clamp and a long bolt, the U-shaped clamp is locked and connected with the movable ladder through the long bolt, and the U-shaped clamp is fixedly connected with the built steel pipe pole main pole.

7. The cable termination and grounding structure based on a built overhead transmission line according to claim 1, characterized in that, ​ 8. The cable termination and grounding structure based on a built overhead transmission line according to claim 7, characterized in that, ​ 9. The cable termination downlead structure based on a reconstructed overhead transmission line according to any one of claims 1 to 8, characterized in that, ​ 10. The cable termination and grounding structure based on a built overhead transmission line according to claim 9, characterized in that, ​

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