Semi-permanent stay wire device for power transmission tower

Abstract

The utility model belongs to the field of power transmission line engineering, and provides a semi-permanent stay wire device for a power transmission tower. The wire stay wire tower connection fitting comprises a first GD hanging point fitting, a first U-shaped hanging ring and a first NUT wire clamp which are connected in sequence. The wire stay wire tower connection fitting is connected with a wire stay wire construction hole of the power transmission tower through the first GD hanging point fitting; the wire pulling base comprises a first wire pulling rod, a first pull ring, a first parallel hanging plate, a second wire pulling rod, a second parallel hanging plate and a second NUT wire clamp which are connected in sequence; the stay wire is connected with a stay wire construction hole of the power transmission tower through a GD hanging point fitting, the tower connection fitting is converted through a U-shaped hanging ring, the tension of the stay wire is adjusted through an NUT wire clamp, the entering direction and length of a stay wire rod can be adjusted through a parallel hanging plate, smooth connection between the stay wire and the power transmission tower as well as between the stay wire and a stay wire foundation can be guaranteed, and the construction efficiency is improved. The tension of the stay wire can be adjusted to adapt to different environments.

Description

Technical Field

[0001] The utility model belongs to the field of power transmission line engineering, and in particular relates to a semi-permanent wire pulling device for a power transmission tower. Background Art

[0002] In recent years, the construction speed of UHV transmission line projects has been accelerating. Affected by factors such as the inconsistency between the power outage period of the crossed lines and the construction period of the ground wire erection of the new line projects, the new line projects often need to erect the ground wire in advance during the power outage of the crossed lines. In order to ensure the safety of the transmission towers and lines in the advance erection section, it is generally necessary to set up guy wires at both ends of the tension section of the erected ground wire. Different from the temporary guy wire scheme set up in conventional line erection projects, this kind of guy wire setting takes a long time, generally spanning a winter or longer, so for this kind of semi-permanent guy wire, it is necessary to consider the design conditions such as winter icing. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides a semi-permanent wire pulling device for a transmission tower.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] The utility model provides a semi-permanent wire pulling device for a transmission tower, comprising a conductor wire pulling device and a ground wire pulling device; the conductor wire pulling device comprises a conductor wire pulling tower hardware, a conductor wire and a conductor wire pulling foundation connected in sequence; the ground wire pulling device comprises a ground wire pulling tower hardware, a ground wire wire and a ground wire pulling foundation connected in sequence.

[0006] The conductor pulling tower hardware includes a first GD hanging point hardware, a first U-shaped hanging ring and a first NUT wire clamp connected in sequence; the conductor pulling tower hardware is connected to the conductor pulling construction hole of the transmission tower through the first GD hanging point hardware; the conductor pulling foundation includes a first pulling rod, a first pulling ring, a first parallel hanging plate, a second pulling rod, a second parallel hanging plate and a second NUT wire clamp connected in sequence.

[0007] The ground wire pull tower hardware includes a second GD hanging point hardware, a second U-shaped hanging ring and a third NUT wire clamp connected in sequence; the ground wire pull tower hardware is connected to the ground wire pull construction hole of the transmission tower through the second GD hanging point hardware; the ground wire pull foundation includes a third pull rod, a second pull ring, a third parallel hanging plate, a fourth pull rod, a fourth parallel hanging plate and a fourth NUT wire clamp connected in sequence.

[0008] Preferably, the wire pull wire is arranged on the side of the wire where no wire is strung.

[0009] Preferably, the ground wire pull wire is arranged on the side where the ground wire is not wired.

[0010] Preferably, the angles of the conductor pull wire and the ground wire pull wire to the ground do not exceed 45°.

[0011] Preferably, the first tension rod is fixed inside the first basic column, and a first basic base plate is provided at the bottom of the first basic column.

[0012] Preferably, the angle between the first foundation column and the first foundation base plate does not exceed 60°.

[0013] Preferably, the third tension rod is fixed inside the second basic column, and a second basic base plate is provided at the bottom of the second basic column.

[0014] Preferably, the angle between the second foundation column and the second foundation base plate does not exceed 60°.

[0015] Preferably, the foundation columns and the foundation slab are both formed by casting concrete.

[0016] Preferably, the conductor pull wire and the ground wire pull wire are both made of galvanized steel stranded wire.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model adopts GD hanging point hardware to connect the guy wire construction hole of the transmission tower, which can ensure the firm connection between the guy wire and the transmission tower; the tower connecting hardware adopts U-shaped hanging ring for conversion, and the guy wire tension is adjusted by NUT wire clamp, and the parallel hanging plate can be used to adjust the approach direction and length of the guy wire rod, which can ensure the smooth connection between the guy wire and the transmission tower and the guy wire foundation, and can adjust the guy wire tension to adapt to different environments, thereby ensuring the stability of the semi-permanent guy wire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention.

[0020] In the attached picture:

[0021] Figure 1 It is a front view of the semi-permanent wire pulling device of the utility model;

[0022] Figure 2 It is a side view of the semi-permanent wire pulling device of the utility model;

[0023] Figure 3 It is a top view of the semi-permanent wire pulling device of the utility model;

[0024] Figure 4 A schematic diagram of the direction of setting the wire of the semi-permanent wire pulling device of the utility model;

[0025] Figure 5 This is a schematic diagram of the connection of the wire pulling wire hanging point of the utility model;

[0026] Figure 6 This is a schematic diagram of the ground wire pull wire hanging point connection of the utility model;

[0027] Figure 7 This is the assembly diagram of the conductor pull wire / ground wire pull wire connection hardware of the utility model;

[0028] Figure 8 It is a schematic diagram of the basic structure of the conductor pull wire / ground wire pull wire;

[0029] Fig. 9 for Figure 8 Schematic cross-sectional view of ;

[0030] Fig.10 This is a schematic diagram of the structure of pre-buried tension rods for foundation columns.

[0031] In the figure, 1-ground wire pull wire; 2-conductor pull wire; 3-wire pull foundation; 4-ground wire installed; 5-conductor installed; 6-conductor hanging hole; 7-conductor pull wire construction hole; 8-ground wire hanging hole; 9-ground wire pull wire construction hole; 10-first GD hanging point hardware; 11-first U-shaped hanging ring; 12-first NUT wire clamp; 13-first pull ring; 14-first parallel hanging plate; 15-second wire pull rod; 16-second parallel hanging plate; 17-first Second NUT wire clamp; 18-second GD hanging point hardware; 19-second U-shaped hanging ring; 20-third NUT wire clamp; 21-second pull ring; 22-third parallel hanging plate; 23-fourth pull rod; 24-fourth parallel hanging plate; 25-fourth NUT wire clamp; 26-first foundation column; 27-first foundation bottom plate; 28-second foundation column; 29-second foundation bottom plate; 30-first pull rod; 31-third pull rod; DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0033] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0034] The purpose of the utility model is to provide a semi-permanent wire pulling device for a transmission tower. Figure 1 As shown, the utility model includes a conductor pulling device and a ground wire pulling device; the conductor pulling device includes a conductor pulling tower hardware, a conductor pulling wire 2 and a conductor pulling foundation connected in sequence; the ground wire pulling device includes a ground wire pulling tower hardware, a ground wire pulling wire 1 and a ground wire pulling foundation connected in sequence.

[0035] like Figure 2 , Figure 3 and Figure 4 As shown, the conductor pull wire 2 is arranged on the other side of the installed conductor 5, that is, the pull wire is arranged on the side where the conductor is not installed; the ground wire pull wire 1 is arranged on the other side of the installed ground wire 4, that is, the pull wire is arranged on the side where the ground wire is not installed. The installation time of the semi-permanent pull wire device exceeds half a year but does not exceed one year, and the structural importance coefficient of the semi-permanent pull wire device is considered as 1.0 times. The angles of the conductor pull wire and the ground wire pull wire to the ground do not exceed 45°.

[0036] like Figure 5 and Figure 6 As shown, the conductor pulling device of the utility model is connected to the conductor pulling construction hole 7 of the transmission tower through the conductor pulling tower fitting, and the ground wire pulling device is connected to the ground wire pulling construction hole 9 of the transmission tower through the ground wire pulling tower fitting; the tower fitting is selected according to the standard general fitting ("Typical Design of Transmission and Transformation Project of State Grid Corporation-800kV Fitting Volume" (2013 Edition)), matched with the existing construction hole, to ensure smooth assembly.

[0037] like Figure 7As shown, the conductor pull tower fittings include a first GD hanging point fitting 10, a first U-shaped hanging ring 11 and a first NUT wire clamp 12 connected in sequence; the conductor pull tower fittings are connected to the conductor pull construction hole 7 of the transmission tower through the first GD hanging point fitting 10; the conductor pull foundation includes a first pull rod 30, a first pull ring 13, a first parallel hanging plate 14, a second pull rod 15, a second parallel hanging plate 16 and a second NUT wire clamp 17 connected in sequence; the ground wire pull tower fittings include a second GD hanging point fitting 18, a second U-shaped hanging ring 19 and a third NUT wire clamp 20 connected in sequence; the ground wire pull tower fittings are connected to the ground wire pull construction hole 9 of the transmission tower through the second GD hanging point fitting 18; the ground wire pull foundation includes a third pull rod 31, a second pull ring 21, a third parallel hanging plate 22, a fourth pull rod 23, a fourth parallel hanging plate 24 and a fourth NUT wire clamp 25 connected in sequence.

[0038] The tower joint hardware is selected according to the general design transmission line hardware atlas, and the cable is connected to the cable construction hole of the transmission tower using the GD hanging point hardware, which can ensure the smooth connection between the cable and the transmission tower and the cable foundation, and can pre-adjust the cable tension to ensure the normal operation of the cable. The utility model uses a U-shaped hanging ring for conversion, adjusts the cable tension through the NUT wire clamp, and uses a parallel hanging plate to adjust the approach direction and length of the cable rod.

[0039] like Figure 8 As shown, the wire pulling foundation is connected to the first foundation column 26, a first foundation base plate 27 is arranged at the bottom of the first foundation column 26, and the angle between the first foundation column 26 and the first foundation base plate 27 does not exceed 60°; the ground wire pulling foundation is connected to the second foundation column 28, a second foundation base plate 29 is arranged at the bottom of the second foundation column 28, and the angle between the second foundation column 28 and the second foundation base plate 29 does not exceed 60°

[0040] like Fig. 9 As shown, the first guy rod 30 is embedded in the first foundation column 26, and the third guy rod 31 is embedded in the second foundation column 28. The foundation column and the foundation base plate are in the form of cast-in-place concrete, and the first guy rod 30 and the third guy rod 31 are embedded respectively. Compared with traditional anchors, it can provide greater pulling force and can be suitable for guy wire settings with larger forces such as UHV projects.

[0041] like Fig.10 As shown, a support rod is provided between the first wire rod 30 and the first pull ring 13, and a support rod is provided between the third wire rod 31 and the second pull ring 21. The support rod is connected to the curved part of the wire rod by welding, providing stable support for the whole structure.

[0042] The installation method of the utility model comprises the following steps:

[0043] Connect the wire tower fittings with the wire construction holes through the GD hanging point fittings, and pre-embed the wire foundation in the foundation columns through the first wire rod 30 and the third wire rod 31 respectively, so that the wire foundation is connected to the foundation column; connect the wires to the wire tower fittings and the wire foundation respectively, adjust the hanging plate to adjust the approach direction and length of the wire rod, and adjust the NUT wire clamp to adjust the wire tension.

[0044] The hanging point of the connection transmission tower of the utility model is set at the temporary hanging hole of the cable. After the adjacent tension section ground wire is erected, the semi-permanent cable is removed. The construction sequence of the ground wire erection stage is as follows:

[0045] (1) When laying the ground wire in the tension section, a temporary reverse tension wire shall be installed;

[0046] (2) After the installation of the tension section ground wire is completed, the temporary reverse wire is removed;

[0047] (3) Install a semi-permanent wire pulling device on the ground wire construction hole;

[0048] (4) When the ground wire of the adjacent tension section is installed later, the semi-permanent guy wire is removed and the ground wire of the tension section is installed.

[0049] The installation time of the semi-permanent cable-stayed device is more than half a year but less than one year. It is a temporary structure system, and the importance coefficient of the semi-permanent cable-stayed structure is considered as 1.0 times. The horizontal tension of the balanced conductor is considered as 30%, and the horizontal tension of the balanced ground wire temporary cable-stayed balanced ground wire is considered as 10%. Among them, the design safety factor of the semi-permanent cable-stayed device is considered as 2.5; the cable-stayed side span is calculated as an isolated span; the height difference of the isolated span and the design representative span are calculated based on the height of the hanging point; the semi-permanent cable-stayed device is made of galvanized steel stranded wire, and the parameters meet the requirements of YB / T 5004-2012; the front side of the cable-stayed turning angle is considered as a negative value.

[0050] The force calculation method of the guy wire is based on the normal operation of the transmission tower line, line breakage (including longitudinal unbalanced tension when the conductor is split) and load combination under uneven icing conditions:

[0051] (1) Under normal operation of the transmission tower, calculate the following load combinations:

[0052] ① Basic wind speed, no ice, no broken wire (including minimum vertical load and maximum horizontal load combination);

[0053] ② Designed icing, corresponding wind speed and temperature, and no disconnection;

[0054] ③ Minimum temperature, no ice, no wind, and no broken lines (applicable to terminal and corner transmission towers).

[0055] (2) The following basic load combinations should be calculated for the broken line of a suspended transmission tower:

[0056] For transmission towers with a total number of conductor phases not exceeding 3 installed on the same tower: if any one phase of a single conductor is broken (any one phase of a split conductor has longitudinal unbalanced tension), the ground wire is not broken; if any one ground wire is broken, the conductor is not broken.

[0057] (3) For the disconnection of the tension type transmission tower, the following basic load combinations are calculated:

[0058] Transmission towers with a total of 2 phases of conductors installed on the same tower: within the same level, cut off any ground wire, and cut off any pole of a single conductor (any pole of a split conductor has longitudinal unbalanced tension).

[0059] (4) The transmission tower should take into account the unbalanced tension caused by uneven ice coverage on all conductors and ground wires in the same direction at the same time.

[0060] This semi-permanent cable takes into account normal operating conditions and icing conditions. The calculation method of the semi-permanent cable that crosses the winter is analyzed. Different numbers of cables and cable specifications can be set according to the difference in the force between the conductor cable 2 and the ground cable 1. By setting the semi-permanent cable as an isolated cable, its horizontal and vertical cable spacing can be selected according to the actual terrain conditions of the construction site. The cable specifications can be flexibly adjusted according to the cable balancing force, which increases the scope of use of this semi-permanent cable. In addition, the rigidity of the cable and the cable foundation can be appropriately increased, and the cable can be appropriately pre-tightened to play a balancing role and improve safety.

[0061] The pull-out bearing capacity of the wire-drawing foundation is calculated according to the "Code for Foundations of Overhead Transmission Lines" (DLT 5219), and the foundation anti-overturning calculation is performed at the same time. The ground exposure of the wire-drawing foundation is 300mm, and the base surface is leveled within 9.0m from the top of the column, and there should be no obvious changes in the terrain outside 9.0m, such as ridges and ditches lower than the base surface. The first wire-drawing rod 30 and the third wire-drawing rod 31 are cast in the foundation concrete. The wire-drawing rods are made of threaded steel bars. The first wire-drawing rod 30 and the third wire-drawing rod 31 are pre-supported together with the wire-drawing foundation. Pull rings are set on the top of the first wire-drawing rod 30 and the third wire-drawing rod 31, and they are obtained to ensure that the direction of the wire-drawing rod exposed on the ground is consistent with the wire-drawing angle to reduce eccentric force.

[0062] The wire-drawing foundation is connected to the wires through a NUT-type wire clamp. During operation, the double wire-drawing connecting plate is respectively inserted into the first pull ring 13 and the second pull ring 21, and the first wire-drawing rod 30 and the third wire-drawing rod 31 are respectively poured into the foundation concrete. The concrete strength when the tower is disassembled and assembled shall not be less than 70% of the design strength, and the concrete strength when the tower is erected as a whole shall reach 100% of the design strength. The main column reinforcement, bottom plate main reinforcement, and frame reinforcement used in the wire-drawing foundation are all HRB400 grade steel bars, and the rest are HPB300 grade steel bars. There are two stirrups at the top of the column, one stirrup is added at the variable section and 100mm above and below, and the rest are evenly arranged.

[0063] During the construction of the cable foundation, all metal components buried in the soil must adopt anti-corrosion measures, and necessary anti-theft measures must be taken for hardware near the ground. After the anchoring is completed and put into use, the operation and maintenance party must maintain the transmission tower anchoring facilities in accordance with the cable tower standards. For example, long-term maintenance of steel strands and hardware should be carried out to prevent rust and other factors that may cause tension relaxation or even breakage, leading to damage to the transmission tower.

[0064] After the foundation construction is completed, backfilling can be carried out after acceptance. The specific requirements for backfilling the foundation pit shall be carried out in accordance with the specifications. For soil that cannot be compacted, appropriate measures should be taken to compact it. For rock foundation pits, large and small crushed stones should be mixed with soil for backfilling. The ratio of crushed stone to soil is 3:1 and compacted in layers to ensure the compactness of the foundation pit. When backfilling the foundation pit, there must be no water or debris in the foundation pit, and tree roots and weeds in the backfill soil must be removed. The backfill soil should be compacted in layers, with each layer 200-300mm thick.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

Claims

1. A semi-permanent cable pulling device for a transmission tower, characterized in that: It comprises a conductor pulling device and a ground wire pulling device; the conductor pulling device comprises a conductor pulling tower hardware, a conductor pulling wire (2) and a conductor pulling foundation connected in sequence; the ground wire pulling device comprises a ground wire pulling tower hardware, a ground wire pulling wire (1) and a ground wire pulling foundation connected in sequence; The conductor pulling tower hardware comprises a first GD hanging point hardware (10), a first U-shaped hanging ring (11) and a first NUT wire clamp (12) which are connected in sequence; the conductor pulling tower hardware is connected to a conductor pulling construction hole (7) of a transmission tower via the first GD hanging point hardware (10); the conductor pulling foundation comprises a first pulling rod (30), a first pulling ring (13), a first parallel hanging plate (14), a second pulling rod (15), a second parallel hanging plate (16) and a second NUT wire clamp (17) which are connected in sequence; The ground wire tie tower hardware comprises a second GD hanging point hardware (18), a second U-shaped hanging ring (19) and a third NUT wire clamp (20) which are connected in sequence; the ground wire tie tower hardware is connected to a ground wire tie construction hole (9) of a transmission tower via the second GD hanging point hardware (18); and the ground wire tie foundation comprises a third tie rod (31), a second tie ring (21), a third parallel hanging plate (22), a fourth tie rod (23), a fourth parallel hanging plate (24) and a fourth NUT wire clamp (25) which are connected in sequence.

2. A semi-permanent cable pulling device for a transmission tower according to claim 1, characterized in that: The conductor pull wire (2) is arranged on the side of the conductor where no wire is strung.

3. A semi-permanent cable pulling device for a transmission tower according to claim 1, characterized in that: The ground wire pull wire (1) is arranged on the side of the ground wire where no wire is erected.

4. A semi-permanent cable pulling device for a transmission tower according to claim 1, characterized in that: The angles of the conductor pull wire (2) and the ground pull wire (1) relative to the ground do not exceed 45°.

5. A semi-permanent cable pulling device for a transmission tower according to claim 1, characterized in that: The first wire drawing rod (30) is fixed inside the first basic column (26), and a first basic bottom plate (27) is provided at the bottom of the first basic column (26).

6. A semi-permanent cable pulling device for a transmission tower according to claim 5, characterized in that: The included angle between the first foundation column (26) and the first foundation bottom plate (27) does not exceed 60°.

7. A semi-permanent cable pulling device for a transmission tower according to claim 1, characterized in that: The third pull rod (31) is fixed inside the second basic column (28), and a second basic bottom plate (29) is provided at the bottom of the second basic column (28).

8. A semi-permanent cable pulling device for a transmission tower according to claim 7, characterized in that: The included angle between the second foundation column (28) and the second foundation bottom plate (29) does not exceed 60°.

9. A semi-permanent cable pulling device for a transmission tower according to any one of claims 5 to 8, characterized in that: The foundation columns and the foundation slab are both formed by pouring concrete.

10. A semi-permanent cable pulling device for a transmission tower according to claim 1, characterized in that: The conductor pull wire (2) and the ground wire pull wire (1) are both made of galvanized steel stranded wire.

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