Electric transmission line drilling steel frame

Abstract

The utility model relates to the technical field of electric power facilities, in particular to a power transmission line drilling steel frame which comprises a drilling wire steel frame, a drilling ground wire steel frame and a tower body gusset plate. The through-drilling wire steel frame and the through-drilling ground wire steel frame are connected to the tower body gusset plate through bolts; the drilling wire steel frame and the drilling ground wire steel frame are symmetrically arranged on the two sides of the existing tower body. The through-drilling wire steel frame comprises an upper-layer through-drilling wire steel frame and a lower-layer through-drilling wire steel frame; front and rear side middle-phase tension strings are respectively arranged on the front and rear sides of the drilling upper-layer wire steel frame; front and rear side edge phase tension strings and edge phase jumper strings are respectively arranged on the front and rear sides of the drilling lower layer wire steel frame; ground wire tension strings are arranged on the front side and the rear side of the drilling ground wire steel frame respectively, a set of middle-phase jumper suspension strings are hung at the end of the outer side of the drilling ground wire steel frame, and ground wire tension strings are arranged on the front side and the rear side of the drilling ground wire steel frame respectively. According to the scheme, a newly-built line is directly drilled through an existing line through the steel frame, land occupation is not needed, and the original line does not need to be heightened.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power facilities, in particular to a transmission line drilling steel frame. Background Art

[0002] With the continuous growth of new lines, the intersection of new lines and existing lines is bound to increase. At present, the solution for new lines to cross existing lines, especially low-voltage lines, is relatively simple and mature. It can be crossed by crossing towers, and it can be crossed with power off or with power on. However, due to the limitations of the new line path, the distance between the existing conductors and the ground, and the height of the towers, it is often difficult to drill through the existing lines.

[0003] In the past, when a new line was drilled over an existing line, there were probably several drilling schemes: When the new line was a single-circuit line, when selecting the line path plan, the two sides of the higher pole towers of the existing line were selected for drilling over. This scheme is more feasible for drilling a lower voltage level line over a higher voltage level line, but it is less feasible for drilling over lines of the same voltage level. The new line is a double-circuit line, and due to the high height of the double-circuit pole tower, it is difficult to drill over the existing line. At this time, the new double circuit is generally divided into two single circuits in the drilling section, and the drilling is performed on both sides or on the same side of the higher pole tower of the existing line. However, this scheme is also less feasible for drilling over lines of the same voltage level.

[0004] When the above solutions cannot achieve drilling, the original line heightening and reconstruction is generally adopted. This solution requires increased line investment and power outage of the existing line. The original line tower materials removed after the reconstruction usually cannot be used again, resulting in waste and huge economic losses. Therefore, it is very necessary to study the new drilling technology for transmission lines. Utility Model Content

[0005] The utility model provides a transmission line drilling steel frame, which enables the new overhead line to drill over the existing overhead line. The steel frame is directly installed on the tower of the existing transmission line to be drilled over, and the new line directly uses the steel frame to drill over the existing line, without the need to occupy land and without the need to raise the original line, which has very good economic and social benefits. The utility model provides a transmission line drilling steel frame, which is arranged at the lower part of the tower to be drilled over, and the upper part of the tower is a previous transmission line installation unit, the previous transmission line installation unit includes three horizontal cross bars for hanging transmission lines, the drilling steel frame includes a drilling conductor steel frame 4, a drilling ground wire steel frame 3 and a tower node plate 18; the drilling conductor steel frame and the drilling ground wire steel frame are connected to the tower node plate by bolts; the drilling conductor steel frame 4 and the drilling ground wire steel frame 3 are symmetrically arranged; the plane to which the drilling conductor steel frame 4 and the drilling ground wire steel frame 3 belong in the longitudinal direction is perpendicular to the plane to which the three cross arms of the previous transmission line installation unit belong in the longitudinal direction;

[0006] Drilling through the conductor steel frame 4, including drilling through the middle phase 4-1 of the upper conductor steel frame and drilling through the side phase 4-2 of the lower conductor steel frame;

[0007] Drill through the middle phase 4-1 of the upper conductor steel frame, the rear side is equipped with a rear middle phase tension string 7; the front side is equipped with a front middle phase tension string 15

[0008] Drilling through the lower conductor steel frame 4-2, a side phase tension string 8 is arranged at the rear side; a set of side phase jumper suspension strings 12 are hung at the outer end and between the end and the root; a front side side phase tension string 16 is arranged at the front side;

[0009] The ground wire steel frame 3 is drilled through, and a group of mid-phase jumper suspension strings 11 are hung at the outer end; front and rear side ground wire tension strings 19 are arranged near the end and the root.

[0010] Furthermore, the hanging strings serving as hanging points are symmetrically arranged.

[0011] Furthermore, the front and rear side surfaces of the steel frame for drilling over the conductor are triangular in design, the upper end surface is an inclined rectangular surface, and the lower end surface is a horizontally arranged rectangular surface; the front and rear end surfaces of the steel frame for drilling over the ground wire are triangular in design, the lower end surface is an inclined rectangular surface, and the upper end surface is a horizontally arranged rectangular surface.

[0012] Furthermore, the horizontal length of the upper conductor steel frame 4 - 1 drilled through is smaller than the horizontal length of the lower conductor steel frame 4 - 2 drilled through and the ground wire steel frame 3 drilled through.

[0013] The beneficial effects of the utility model are as follows:

[0014] The drilling tower is basically suitable for all drilling projects of higher voltage level or the same voltage level overhead lines, especially for areas with dense line channels and restricted drilling. The selection of drilling points is flexible, which solves the problem of large-scale detours in previous line design to drill through existing lines, saving project investment.

[0015] The drilling tower is directly installed on the tower of the existing transmission line to be drilled through. It only needs to check and reinforce the tower. No land acquisition or height increase is required for the drilling tower, which avoids the encroachment of land by the drilling tower in previous designs and the waste of newly purchased and scrapped tower materials during the height increase and reconstruction process.

[0016] After using the drilling tower to achieve drilling, the drilling line and tower design meet the requirements of current standards and specifications, and through technical and economic analysis, the engineering cost of this drilling scheme is much lower than the engineering cost of previous drilling schemes.

[0017] Therefore, the utility model has good economic and social benefits and has good popularization and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 yes Figure 1 The right side view of the drilled steel frame structure;

[0020] The serial number of the parts in the figure is as follows: 1 is the drilled tower; 2 is the drilled tower conductor suspension string; 3 is the drilled ground wire steel frame; 4-1 is the drilled upper conductor steel frame middle phase; 4-2 is the drilled lower conductor steel frame side phase; 5 is the drilled steel frame rear middle phase conductor; 6 is the drilled steel frame rear side side phase conductor; 7 is the drilled steel frame rear middle phase tension string; 8 is the drilled steel frame rear side side phase tension string; 9 is the drilled steel frame middle phase jumper; 10 is the drilled steel frame The phase jumper at the edge of the steel frame; 11 is the suspended string of the middle phase jumper at the middle of the steel frame; 12 is the suspended string of the side phase jumper at the edge of the steel frame; 13 is the middle phase conductor at the front side of the steel frame; 14 is the side phase conductor at the front side of the steel frame; 15 is the middle phase tension string at the front side of the steel frame; 16 is the side phase tension string at the front side of the steel frame; 17 is the ground wire of the drilled line; 18 is the tower node plate connecting the drilled line and the existing line tower; 19 is the front and rear ground wire tension string. DETAILED DESCRIPTION

[0021] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0022] The utility model provides a transmission line drilling steel frame, the structural key point of which is to connect the tower node plate and the drilling steel frame with bolts on the premise of meeting the requirements of the cross-span distance in the section, the electrical clearance of the tower head and the lightning protection, and finally fix the drilling steel frame on the built transmission tower.

[0023] refer to Figure 1 A transmission line drilling steel frame is arranged at the lower part of the tower to be drilled, and the upper part of the tower is a previous transmission line installation unit, the previous transmission line installation unit includes three horizontal cross arms for hanging transmission lines, and the cross arms are provided with a suspended string 2 of the drilled tower conductor, the drilling steel frame includes a drilling conductor steel frame 4, a drilling ground wire steel frame 3 and a tower node plate 18; the drilling conductor steel frame and the drilling ground wire steel frame are connected to the tower node plate by bolts; the drilling conductor steel frame 4 and the drilling ground wire steel frame 3 are symmetrically arranged; the plane to which the drilling conductor steel frame 4 and the drilling ground wire steel frame 3 belong in the longitudinal direction is perpendicular to the plane to which the three cross arms of the previous transmission line installation unit belong in the longitudinal direction; that is, the transmission lines on the existing steel frame cross arms are vertically distributed to the direction of the drilled transmission lines.

[0024] Drilling through the conductor steel frame 4, including drilling through the middle phase 4-1 of the upper conductor steel frame and drilling through the side phase 4-2 of the lower conductor steel frame;

[0025] Drilling through the middle phase 4-1 of the upper conductor steel frame, a rear middle phase tension string 7 is arranged on the rear side; and a front middle phase tension string 15 is arranged on the front side.

[0026] Drill through the lower conductor steel frame side phase 4-2, with a side phase tension string 8 arranged at the rear; a set of side phase jumper suspension strings 12 are hung at the outer end, and a front side side phase tension string 16 is arranged at the front side;

[0027] The ground wire steel frame 3 is drilled through, and a set of mid-phase jumper suspension strings 11 are hung at the outer end.

[0028] As an improvement to the solution, the hanging strings serving as hanging points are arranged symmetrically.

[0029] As an improvement on the solution, the front and rear sides of the steel frame for drilling over the conductor are designed in a triangular shape, the upper end face is an inclined rectangular surface, and the lower end face is a horizontal rectangular surface; the front and rear end faces of the steel frame for drilling over the ground wire are designed in a triangular shape, the lower end face is an inclined rectangular surface, and the upper end face is a horizontal rectangular surface. This design provides support stability.

[0030] As an improvement of the scheme, the horizontal length of the upper conductor steel frame 4-1 is smaller than the lower conductor steel frame 4-2 and the ground conductor steel frame 3. When the three phases of the transmission line are drilled, they are arranged in a triangular space, wherein two phases are routed by setting a set of side phase jumper suspension strings 12 for suspending conductors on the lower conductor steel frame 4-2, and the end hanging point of the upper conductor steel frame 4-1 is located above the two hanging points on the lower conductor steel frame 4-2, so that the three hanging points are distributed in a triangular pattern.

[0031] As an improvement to the scheme, in order to meet the longitudinal clearance requirement between the transmission line and the crossarm, the phase jumper 9 in the steel frame that drills through the upper conductor steel frame 4-1 must jump to the phase jumper suspension string 11 in the steel frame that drills through the ground wire steel frame 3, and be connected to the middle phase conductor 13 on the front side of the drilled line.

[0032] The drilling conductor steel frame 4 and the drilling ground wire steel frame 3 are arranged throughout the entire length and are fixed to the tower body of the drilled tower 1 through the tower body node plate 18 at the root. The outer contour of the drilling steel frame is a triangular bracket structure. The upper and lower plane oblique materials of the steel frame are arranged in a cross manner, and the front and rear surfaces are arranged in a triangle. The drilling upper conductor steel frame 4-1 is provided with a single-phase conductor hanging point at the end of the steel frame, and the drilling lower conductor steel frame 4-2 is provided with a single-phase conductor at the end of the steel frame and the middle of the steel frame. The three-phase conductors are arranged in a triangle, which fully meets the electrical clearance requirements and has a simple structure.

[0033] The middle phase conductor 5 at the rear side of the drilling line is connected to the drilling upper conductor steel frame 4-1 through the middle phase tension string 7 at the rear side of the drilling steel frame, and is connected to the middle phase conductor 13 at the front side of the drilling line through the middle phase jumper 9 and the middle phase jumper suspension string 11 of the drilling steel frame. The middle phase conductor 13 at the front side of the drilling line is connected to the drilling upper conductor steel frame 4-1 through the middle phase tension string 15 at the front side of the drilling steel frame; the side phase conductor 6 at the rear side of the drilling line is connected to the drilling upper conductor steel frame 4-1 through the drilling steel frame. The rear side phase tension string 8 is connected to the drilled-through lower conductor steel frame, and is connected to the drilled-through line front side phase conductor 14 through the drilled-through steel frame side phase jumper 10 and the drilled-through steel frame side phase jumper suspension string 12. The drilled-through line front side phase conductor 14 is connected to the drilled-through lower conductor steel frame 4-2 via the drilled-through steel frame front side phase tension string 16; the drilled-through line ground wire 17 is connected to the ground wire hanging point of the drilled-through ground wire steel frame 3 via the front and rear side ground wire tension strings 19.

[0034] A vertical partition is set at the conductor hanging point to strengthen the overall rigidity. The three-layer steel frame is arranged from the lowest cross arm of the tower body downward in sequence. The conductor steel frame is provided with conductor hanging points and jumper hanging points and is equipped with construction holes. The arrangement of the drill-through conductor is changed from vertical arrangement to triangular arrangement, reducing the distance to the ground, improving the drill-through effect, and greatly improving the applicability of the line corridor.

[0035] The 220kV transmission line drilling steel frame described in the utility model can be installed at the tower body of the 500kV or 220kV transmission line straight crossing tower. Taking the 500kV crossing tower as an example, the control working condition of the crossing tower is a strong wind working condition, which is mainly controlled by the wind load of the line in the direction of the line. Since the iron tower is a square symmetrical structure, the drilling tower has a certain margin in the vertical direction of the line. The use conditions of the drilling steel frame can be controlled during line design, and the margin of the crossing tower in the vertical direction of the line is used to meet the tower load and structural design requirements. On the basis of comprehensive engineering experience, according to the requirements of the latest version of national standards, industry standards and relevant technical documents, after adding the crossing frame, the full strength of the main material of the tower leg of the crossing tower is slightly increased through structural force calculation, and only the main material of the tower leg needs to be reinforced. After calculation, the foundation force is basically consistent with the original tower type, and no reinforcement measures are required for the foundation. It avoids the problems of splitting the newly built double circuit into two single circuits or renovating the existing drilled power lines, and has great social and economic benefits.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A transmission line drilling steel frame, arranged at the lower part of the tower to be drilled, the upper part of the tower is a previous transmission line installation unit, the previous transmission line installation unit comprises three horizontal cross bars for hanging the transmission line, characterized in that: The drilling steel frame comprises a drilling conductor steel frame (4), a drilling ground wire steel frame (3) and a tower node plate (18); the drilling conductor steel frame and the drilling ground wire steel frame are connected to the tower node plate by bolts; the drilling conductor steel frame (4) and the drilling ground wire steel frame (3) are symmetrically arranged; the planes to which the drilling conductor steel frame (4) and the drilling ground wire steel frame (3) belong in the longitudinal direction are perpendicular to the planes to which the three cross arms of the previous transmission line installation unit belong in the longitudinal direction; The drilling-through conductor steel frame (4) comprises a drilling-through upper conductor steel frame (4-1) and a drilling-through lower conductor steel frame (4-2); Drilling through the upper conductor steel frame (4-1), a rear middle phase tension string (7) is arranged at the rear side; A front middle phase tension string (15) is arranged on the front side; Drilling through the lower conductor steel frame (4-2), a side phase tension string (8) is arranged on the rear side; a group of side phase jumper suspension strings (12) are respectively suspended at the outer end and between the end and the root; and a front side side phase tension string (16) is arranged on the front side; A ground wire steel frame (3) is drilled through, and a group of mid-phase jumper suspension strings (11) are suspended at the outer end; front and rear ground wire tension strings (19) are arranged near the end and the root.

2. A transmission line drilling steel frame as claimed in claim 1, characterized in that: The jumper suspension strings used as hanging points are arranged symmetrically.

3. A transmission line drilling steel frame as claimed in claim 1, characterized in that: The front and rear side surfaces of the conductor drilling steel frame (4) are triangular in design, the upper end surface is a rectangular surface with an inclined design, and the lower end surface is a rectangular surface with a horizontal setting; the front and rear side surfaces of the ground wire drilling steel frame (3) are triangular in design, the lower end surface is a rectangular surface with an inclined design, and the upper end surface is a rectangular surface with a horizontal setting.

4. A transmission line drilling steel frame as claimed in claim 1, characterized in that: The horizontal length of the upper conductor steel frame (4-1) drilled through is smaller than the horizontal length of the lower conductor steel frame (4-2) drilled through and the horizontal length of the ground wire steel frame (3) drilled through.

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