How to assemble the pipe unit

Abstract

This invention provides a method for assembling pipe units using a horizontal assembly method, which improves workability and reliability when assembling pipe units. [Solution] The method for assembling the insulator unit comprises: a first step of holding the internal structure, including the insulating unit and fixing fittings, in a horizontal position; a second step of lifting the insulator body; a third step of inserting the internal structure into the insulator body; a fourth step of fixing the rear end of the insulator body to the fixing fittings; and a fifth step of fixing the upper fittings to the front end of the insulator body. The third step involves using an assembly support device for inserting the insulator, which has wheels, and moving the assembly support device so that the front end of the internal structure is fixed to the assembly support device, and the internal structure and the insulator body move relatively in the axial direction.

Description

Technical Field

[0001] The present invention relates to a method for assembling an insulator unit.

Background Art

[0002] Conventionally, as a cable termination connection portion provided at an end of a power cable, an air termination connection portion that performs air insulation using an insulator is known. The air termination connection portion is an example of an insulator unit. In the air termination connection portion, except for a direct mold type, an insulating medium such as insulating oil (for example, silicone oil) is generally sealed in the insulator.

[0003] The insulator unit is composed of a porcelain or polymer insulator and a cable terminal portion. The cable terminal portion is of a type in which a cable conductor is inserted to the distal end side inside the insulator (for example, see Patent Document 1), or a type in which the distal end side of an internal structure including a conductor lead bar, an insulating unit and a fixing fitting is inserted into the insulator, the insulator is fixed to the fixing fitting provided at the rear end portion of the internal structure, and the cable terminal portion is connected to the rear end portion of the internal structure (for example, see Patent Document 2). In Patent Documents 1 and 2, the electric field is relaxed by arranging a cylindrical rubber unit in the insulator.

[0004] Further, Patent Document 1 discloses a horizontal assembly method in which the internal structure is held in a horizontal state, and the insulator is inserted from the horizontal direction. Compared with the vertical assembly method, the horizontal assembly method has the advantages that the center of gravity of the entire unit is lowered, the posture is stabilized so that the risk of overturning can be suppressed, the risk of high-place work can be reduced, access to structural parts is easy, and the efficiency of assembly work can be improved. It is particularly suitable for assembling large-sized insulator units.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] However, in horizontal assembly methods, in order to ensure assembly accuracy, it is necessary to consider the bending deformation caused by the self-weight of the long internal structural elements and select appropriate support methods and assembly jigs. Furthermore, compared to the simple lifting and lowering of structural components in vertical assembly methods, the assembly procedure becomes more complicated, which may reduce work efficiency.

[0007] The object of the present invention is to provide a method for assembling pipe units that can improve workability and reliability when assembling pipe units using a horizontal assembly method. [Means for solving the problem]

[0008] The method for assembling the insulator unit according to the present invention is: A first step of holding the internal structure, including the insulating unit and fixing brackets, in a horizontal position, The second step is to lift the main body of the pipe, A third step involves inserting the tip end of the internal structure into the main body of the outer pipe, A fourth step involves fixing the rear end of the main body of the pipe to the fixing bracket, The fifth step involves fixing the upper fitting to the tip of the main body of the insulator, The third step involves using an assembly support device for inserting an outer pipe that has wheels, fixing the tip of the internal structure to the assembly support device, and then moving the assembly support device so that the internal structure and the outer pipe body move relatively in the axial direction. [Effects of the Invention]

[0009] According to the present invention, the workability and reliability when assembling pipe units using the horizontal assembly method can be improved. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a cross-sectional view showing a cable termination connection portion which is an example of an insulator unit. [Figure 2A] Figure 2A is a diagram showing an assembly process of a cable termination connection portion (insulator unit). [Figure 2B] Figure 2B is a diagram showing an assembly process of a cable termination connection portion. [Figure 2C] Figure 2C is a diagram showing an assembly process of a cable termination connection portion. [Figure 2D] Figure 2D is a diagram showing an assembly process of a cable termination connection portion. [Figure 2E] Figure 2E is a diagram showing an assembly process of a cable termination connection portion. [Figure 2F] Figure 2F is a diagram showing an assembly process of a cable termination connection portion. [Figure 2G] Figure 2G is a diagram showing an assembly process of a cable termination connection portion. [Figure 2H] Figure 2H is a diagram showing an assembly process of a cable termination connection portion. [Figure 2I] Figure 2I is a diagram showing an assembly process of a cable termination connection portion. [Figure 2J] Figure 2J is a diagram showing an assembly process of a cable termination connection portion. [Figure 3] Figure 3A and Figure 3B are diagrams showing an insulator lifting device. [Figure 4] Figure 4A to Figure 4D are diagrams showing a process of lifting an insulator main body. [Figure 5] Figure 5A and Figure 5B are front views of an insulator insertion device viewed from the axial direction. [Figure 6] Figure 6A and Figure 6B are plan views of an insulator insertion device viewed from above. [Figure 7] Figure 7A and Figure 7B are side views of an insulator insertion device viewed from the side. [Figure 8] Figure 8A to Figure 8C are diagrams showing an upper fitting mounting device. [Figure 9] Figure 9 is a diagram showing a modified example of the upper fitting mounting device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0012] Figure 1 is a cross-sectional view showing a cable termination connection part 500 which is an example of an insulator unit. The cable termination connection part 500 is an insulator unit provided at the terminal end of a cable terminal portion (not shown).

[0013] As shown in Figure 1, the cable termination connection part 500 includes an insulator 510, an insulation unit 520, a fixing fitting 541, a terminal mounting fitting 542, an insulating medium 543, a conductor lead-out rod 544, and the like. The insulator 510 includes an insulator main body 511 having umbrella portions 511a formed on its outer peripheral surface, an upper fitting 512 that seals the distal end side of the insulator main body 511, and a lower fitting 513 fixed to the fixing fitting 541.

[0014] In the assembly process of the cable termination connection part 500, the internal structure A inserted into the insulator main body 511 includes at least the insulation unit 520, the fixing fitting 541, and the conductor lead-out rod 544. Note that when the internal conductor 521 of the insulation unit 520 is formed to be long in the longitudinal direction, the conductor lead-out rod 544 is not necessary. That is, the internal structure A only needs to include a long conductor, one end of which is connected to a cable conductor (not shown) and the other end of which is led out from the insulator 510, and may be formed as a single conductor by lengthening the internal conductor 521, or may be formed by connecting the conductor lead-out rod 544 to the internal conductor 521. In the following description, the side from which the conductor (the conductor lead-out rod 544 in the present embodiment) is led out is referred to as the "distal end side", and the side on which the cable terminal portion (not shown) is mounted is referred to as the "rear end side".

[0015] The insulator 510 may be, for example, a porcelain insulator, or may be a polymer insulator (also referred to as a composite insulator) in which a polymer covering made of a polymer insulating material such as silicone rubber is integrally formed on the outside of a cylindrical body made of fiber reinforced plastics (FRP).

[0016] The insulating unit 520 includes an axially extending internal conductor 521, an insulating cylinder 522 positioned on the outer circumferential surface of the internal conductor 521, a shielding portion 523 formed on the outer circumferential surface of the insulating cylinder 522, and an electric field mitigation portion 530. The insulating unit 520 functions as a reinforcing insulating portion of the terminal connection portion 500. The internal conductor 521 and the insulating cylinder 522 are integrally formed by molding.

[0017] The internal conductor 521 is made of a conductive material suitable for electrical conduction, such as copper, aluminum, a copper alloy, or an aluminum alloy. The inner circumferential surface of the rear end of the internal conductor 521 is exposed from the insulating cylinder 522 and is provided with a conductor insertion portion 521a for electrically connecting a cable conductor (not shown). The front end of the internal conductor 521 passes through the insulating cylinder 522 and is connected to a conductor lead rod 544.

[0018] The insulating tube 522 is made of a hard plastic resin material with high mechanical strength (for example, epoxy resin or FRP). A cone-shaped terminal insertion portion 522a is provided at the rear end of the insulating tube 522 to receive the cable terminal portion (not shown). The terminal insertion portion 522a communicates with the conductor insertion portion 521a of the internal conductor 521. The conductor insertion portion 521a and the terminal insertion portion 522a form a cable receiving portion 524 to which the cable terminal portion is attached.

[0019] The shielding portion 523 is formed, for example, by applying conductive paint to the outer surface of the insulating cylinder 522. By providing the shielding portion 523, the electric field inside the insulating cylinder 522 is made uniform without concentration between the internal conductor 521 and the shielding portion 523, thereby stabilizing the electrical characteristics.

[0020] The electric field mitigation section 530 is formed from a cylindrical elastic body having an insulating section 531 at the front end and a conductive section 532 at the rear end. The insulating section 531 is concentrically connected to the conductive section 532 at its rear end and is formed cylindrically from an insulating rubber material such as ethylene propylene rubber (EP rubber). The conductive section 532 is formed cylindrically from a semiconducting rubber material such as semiconducting EP rubber. The insulating section 531 and the conductive section 532 are integrally formed by mold molding. The electric field mitigation section 530 is positioned so that the inner surface of the conductive section 532 and the shielding section 523 are electrically connected to the outer surface of the small diameter portion at the front end of the insulating unit 520, and the tip of the shielding section 523 does not protrude from the inner surface of the conductive section 532.

[0021] The fixing bracket 541 is a flange-shaped member having an opening for passing through the insulating unit 520. The fixing bracket 541 is positioned on the rear end side of the insulator body 511 and is fastened, for example, by bolts to a lower fitting 513 integrally provided on the rear end of the insulator body 511. In addition, a support insulator 545 is positioned on the rear end side of the fixing bracket 541 and is fastened, for example, by bolts.

[0022] The terminal mounting bracket 542 is a bottomed cylindrical member positioned on the outer circumferential surface of the rear end of the insulating unit 520. The bottom portion 542a of the terminal mounting bracket 542 is provided with an opening 542b for inserting a cable terminal (not shown). The terminal mounting bracket 542 is positioned on the rear end side of the fixing bracket 541 and is fastened to the fixing bracket 541 and the insulating unit 520, for example, by bolting.

[0023] The inner diameters of the fixing bracket 541 and the terminal mounting bracket 542 are approximately the same as the outer diameter of the rear end of the insulating unit 520. A sealing member (not shown), such as an O-ring, is placed between the fixing bracket 541 and the insulating unit 520. By interposing the sealing member between the fixing bracket 541 and the insulating unit 520, the inside of the insulator body 511 can be kept airtight or liquid-tight to prevent leakage of the insulating medium 543, and bending stress generated in the insulator body 511 can be alleviated. Preferably, multiple sealing members are provided at predetermined intervals in the axial direction.

[0024] The insulating medium 543 is sealed in the space between the outer pipe body 511 and the insulating unit 520 and functions as the main insulating part of the cable termination connection 500. The insulating medium 543 is formed of an insulating oil such as silicone oil.

[0025] The insulating medium 543 is injected into the interior of the insulator 510 (inside the insulator body 511) through a flow path (not shown) provided in the fixing bracket 541, for example. A liquid hose (not shown) that allows the insulating medium 543 to flow in and out is connected to the flow path provided in the fixing bracket 541. The liquid hose is preferably a high-pressure hose such as a flexible hose. A one-touch coupler is provided at one end of the liquid hose so that the hoses for oil filling and oil draining can be easily attached and detached.

[0026] The rear end of the conductor lead rod 544 is connected to the internal conductor 521 of the insulating unit 520, and the front end is pulled out to the outside through the upper fitting 512 of the insulator 510. The conductor lead rod 544 is connected to the internal conductor 521 of the insulating unit 520, for example, via a suitable conductor connecting member. The portion of the conductor lead rod 544 that is placed inside the insulator body 511 may also be a flexible conductor such as a cable.

[0027] Figures 2A to 2J show the assembly process of the cable termination connector 500. The assembly method of the cable termination connector 500 includes the following steps 1 to 5.

[0028] Step 1: Maintain the internal structure A in a horizontal position (see Figures 2A to 2C). Step 2: Lift the main body of the pipe 511 (see Figure 2D). Step 3: Insert the leading end of the internal structure A into the outer pipe body 511 (see Figures 2E and 2F). "The leading end of the internal structure A" refers to the portion excluding the fixing bracket 541 installed on the rear end. Step 4: Secure the rear end of the outer pipe body 511 to the fixing bracket 541 (see Figure 2G). Step 5: Secure the upper fitting 512 to the tip of the main body 511 of the pipe (see Figures 2H to 2J). After assembly in steps 1 through 5, an insulating medium 543 is injected into the outer tube 510, and the unit is placed on a fixed stand in a vertical position for storage. Each step is described in detail below.

[0029] First, in the first step, the insulating unit 520 with the fixing bracket 541 attached is installed on the rotating support base 41 (see Figure 2A). The rotating support base 41 has a rotation axis perpendicular to the axial direction of the insulating unit 520 in the horizontal plane. Specifically, the lifting device 51 is lifted using a crane or the like to hoist the insulating unit 520 vertically upward, the rotating support base 41 and the insulating unit 520 are aligned, and then the lifting device 51 is lowered to fix the fixing bracket 541 to the rotating support base 41.

[0030] Furthermore, while moving the crane (to the right in Figure 2A), the lifting device 51 is lowered, and the insulating unit 520 is rotated around the rotation axis of the rotating support base 41 to a horizontal position (see Figure 2B). The conductor lead rod 544, which is mounted on the lifting trolley 42, is brought closer from the front end of the insulating unit 520, and the internal conductor 521 (see Figure 1) and the conductor lead rod 544 are connected to assemble the internal structure A (see Figure 2C). The internal structure A is held in a horizontal position.

[0031] A member (not shown) having a V-shaped groove for receiving the conductor lead rod 544 is positioned on the upper part of the lifting trolley 42. With the conductor lead rod 544 set in the groove, the height position of the lifting trolley 42 is adjusted in advance so that the centers of the axes of the internal conductor 521 and the conductor lead rod 544 are in approximately the same position before bringing it close to the internal conductor 521. If the internal conductor 521 is made long in the longitudinal direction to the point where the conductor lead rod 544 is unnecessary (long internal conductor 521), the tip of the internal conductor 521 can be placed on the lifting trolley 42 or on the member (not shown) having a V-shaped groove positioned on the lifting trolley 42. Furthermore, the member positioned on the lifting trolley 42 for receiving the conductor lead rod 544 (or long internal conductor 521) is not limited to a V-shaped groove, but may be a U-shaped groove, for example, and its shape is not particularly limited as long as it can support the conductor lead rod 544 (or long internal conductor 521).

[0032] In the second step, the pipe lifting device 10 is used to lift the pipe body 511 vertically upward, and the height position of the pipe body 511 and the internal structure A is adjusted (see Figure 2D).

[0033] Figures 3A and 3B show the pipe lifting device 10. Figure 3B shows a magnified view of one end of the pipe lifting device 10.

[0034] As shown in Figures 3A and 3B, the pipe lifting device 10 includes a long beam 11, a pulley 12, a first lifting device connector 13, and a second lifting device connector 14. The length of the beam 11 is approximately the same as the length of the pipe body 511. The pulley 12 and the first lifting device connector 13 are located at both lower ends of the beam 11. The first lifting device connector 13 is located inside the pulley 12 in the longitudinal direction of the beam 11. The second lifting device connector 14 is located at both upper ends of the beam 11.

[0035] In this embodiment, the longitudinal position of the second suspension fitting connection portion 14 is substantially the same as that of the first suspension fitting connection portion 13, but is not particularly limited. For example, the first suspension fitting connection portions 13 at both ends may be positioned further inward in the longitudinal direction of the beam 11 than the second suspension fitting connection portion 14. Alternatively, the second suspension fitting connection portions 14 at both ends may be positioned further inward in the longitudinal direction of the beam 11 than the first suspension fitting connection portion 13. Note that the first suspension fitting connection portions 13 and the second suspension fitting connection portions 14 may be provided in three or more locations.

[0036] The pulley 12 is a wheel-shaped mechanical element for transmitting power via an endless belt 15. The pulley 12 is, for example, a flat pulley having a flat groove. The shape of the groove in the pulley 12 is adapted to the endless belt 15. A ring-shaped endless belt 15 is wrapped around the pulley 12. As the endless belt 15 rotates, a frictional force is generated at the contact surface between the endless belt 15 and the pulley 12, and this frictional force causes the pulley 12 to rotate in accordance with the movement of the endless belt 15.

[0037] The pulley 12 is pivotally attached to the pulley receiving portion 18 by, for example, a fixing pin 19. The fixing pin 19 functions as the axis of rotation of the pulley 12. The pulley 12 can be removed from the pulley receiving portion 18 by removing the fixing pin 19.

[0038] A first lifting device 16 and a second lifting device 17, such as wire slings, are connected to the first lifting device connection section 13 and the second lifting device connection section 14, respectively. The first lifting device 16 is connected to the main body 511 of the pipe, and the second lifting device 17 is connected to the crane. A lever block (registered trademark) may be used for the first lifting device 16. Since the length of the chain can be easily adjusted by operating the lever block, the length of the first lifting device 16 relative to the main body 511 can be easily adjusted.

[0039] The process of lifting the insulator body 511 will be explained in detail with reference to Figures 4A to 4D. As shown in Figure 4A, the insulator body 511 is placed on the insulator support base 44 and stored with the flange portions at both ends supported. In this state, the endless belt 15 cannot be wrapped around the insulator body 511.

[0040] In this embodiment, as shown in Figure 4B, with the first lifting device 16 connected to the insulator body 511, the second lifting device 17 is lifted by a crane to separate the insulator body 511 from the insulator support base 44. As shown in Figure 4C, the endless belt 15 is attached through the space formed between the insulator body 511 and the insulator support base 44. As shown in Figure 4D, after the endless belt 15 is attached to the insulator body 511, the first lifting device 16 may be removed, or the length of the first lifting device 16 may be shortened to the extent that it does not interfere with the insulator body 511 by adjusting the length of the chain. In this embodiment, the use of a lever block on the first lifting device 16 improves the workability of installation and removal.

[0041] In the third step, the internal structure A is inserted into the insulator body 511 using the insulator insertion device 20. Specifically, as shown in Figure 2E, the tip of the conductor lead rod 544 is fixed to the insulator insertion device 20. Also, as shown in Figure 2F, with the conductor lead rod 544 fixed to the insulator insertion device 20, the insulator body 511 is moved axially by a crane while the insulator insertion device 20 is guided along the inner surface of the insulator body 511. Once the insulator insertion device 20 has been inserted into the insulator body 511, the lifting trolley 42 is removed.

[0042] By using the insulator insertion device 20, the conductor lead rod 544 does not come into contact with the inner surface of the insulator body 511, so the internal structure A can be easily inserted into the insulator body 511 without damaging the inner surface of the insulator body 511.

[0043] Figures 5A and 5B are front views of the insulator insertion device 20 as seen from the axial direction. Figures 6A and 6B are top views of the insulator insertion device 20 as seen from above. Figures 7A and 7B are side views of the insulator insertion device 20 as seen from the side.

[0044] As shown in Figure 5A, the insulator insertion device 20 comprises a running section 21 and an internal structure mounting section 22. The running section 21 has a plurality of wheels 23 and wheel supports 24, and moves the insulator insertion device 20 along the axial direction. The internal structure mounting section 22 has a mounting base 25 and a mounting base connecting section 26, on which a conductor lead rod 544 can be mounted. The mounting base 25 is connected to the wheel supports 24 via the mounting base connecting section 26.

[0045] The wheel 23 is provided to conform to the inner surface shape of the insulator body 511. "Conforming to the inner surface shape" means that the wheel 23 contacts the inner surface of the insulator body 511 at approximately perpendicular angles. Specifically, the wheel support 24 has a first flat portion 241 and a second flat portion 242 formed by bending at an obtuse angle from both ends of the first flat portion 241, and the wheel 23 is mounted perpendicularly to the first flat portion 241 and the second flat portion 242.

[0046] The material, shape, and structure of the wheel 23 are appropriately selected so as not to damage the inner surface of the insulator body 511 when the insulator insertion device 20 runs along the inner surface of the insulator body 511. The outer surface of the wheel 23 is formed of, for example, rubber, thermoplastic resin (for example, polyurethane), or elastomer.

[0047] The wheel 23 includes a first wheel 231 mounted on a first flat section 241 and a second wheel 232 mounted on a second flat section 242. The first wheel 231 is a support wheel that supports the load of the conductor lead rod 544 placed on the mounting base 25, and is usually positioned in the direction of gravity. The second wheel 232 is a guide wheel that guides the insulator insertion device 20 in the direction of travel. The mounting positions of the first wheel 231 and the second wheel 232 with respect to the wheel support 24 may be adjustable. In this case, regardless of the inner diameter of the insulator body 511, the first wheel 231 and the second wheel 232 can be suitably brought into contact with the inner surface of the insulator body 511.

[0048] The first wheel 231 and the second wheel 232 are positioned to support the insulator insertion device 20 at at least three points that define a plane. The second wheel 232 is positioned symmetrically in the circumferential direction with respect to the running axis of the first wheel 231. In this embodiment, as shown in Figures 6A and 6B, at the front end of the insulator insertion device 20, the first wheel 231 and the second wheel 232 are positioned on the same circumference. At the rear end of the insulator insertion device 20, the second wheels 232 are positioned on the same circumference, but the first wheel 231 and the second wheel 232 are not positioned on the same circumference. In other words, the insulator insertion device 20 is supported by six wheels 23.

[0049] The number and arrangement of the wheels 23 are merely examples and can be changed as appropriate. For example, multiple sets (e.g., three sets) of the first wheel 231 and second wheel 232 arranged on the same circumference may be provided in the longitudinal direction. Furthermore, the wheels 23 only need to be able to run stably while supporting the load of the conductor lead rod 544, and fewer than six wheels, for example, three or four, may be arranged to support the insulator insertion device 20.

[0050] When supported by three wheels 23, for example, two second wheels 232 may be provided at the axial end of the first main body 20A (the end opposite to the second main body 20B), and one first wheel 231 may be provided on the second main body 20B, with the support structure of the insulator insertion device 20 being composed of one first wheel 231 and two second wheels 232. Alternatively, when supported by four wheels 23, for example, two second wheels 232 may be provided at the axial end of the first main body 20A (the end opposite to the second main body 20B), and two second wheels 232 may be provided on the second main body 20B, with the support structure of the insulator insertion device 20 being composed of four second wheels 232.

[0051] The mounting base 25 has a dish shape on which the conductor lead rod 544 can be placed. The mounting base 25 is open in the axial direction. The conductor lead rod 544 is fixed to the mounting base 25 by, for example, a fixing belt (not shown). In this embodiment, the conductor lead rod 544 is fixed on the mounting base 25 by inserting the fixing belt through a belt hole (not shown) provided in the wheel support 24 of the first main body 20A.

[0052] The mounting base 25 is connected to the wheel support 24 via the mounting base connecting portion 26. The mounting base connecting portion 26 may be adjustable in height relative to the running portion 21 (see Figures 5A and 5B). Depending on the inner diameter of the insulator body 511, the height of the mounting base 25 can be adjusted so that the conductor lead rod 544 is centered, and this can be applied to assembly methods for insulator units of various sizes. In addition, when inserting the internal structure A into the insulator body 511, it is possible to prevent unnecessary stress from being generated in the parts during the work.

[0053] The insulator insertion device 20 has a first main body 20A and a second main body 20B, and may be configured so that the distance between the first main body 20A and the second main body 20B in the direction of travel can be expanded or contracted. Figures 6A and 7A show the state in which the distance between the first main body 20A and the second main body 20B is reduced, and Figures 6B and 7B show the state in which the distance between them is expanded.

[0054] The first main body 20A and the second main body 20B each have a running section 21 and an internal structure mounting section 22. The second main body 20B has a main body connecting section 27 that extends in the direction of travel. The main body connecting section 27 is slidably attached, for example, to the lower surface of the wheel support 24 of the first main body 20A via a sliding mechanism. When the distance between the first main body 20A and the second main body 20B is extended, since wheels 23 are attached to both the first main body 20A and the second main body 20B, the tilting of the device due to the weight of the conductor lead rod 544 can be suppressed, and the posture stability when traveling with the conductor lead rod 544 mounted is improved. In this embodiment, the first main body 20A is provided with one first wheel 231 and a set of two second wheels 232 at its longitudinal front end, and two second wheels 232 at its rear end. In the second main body section 20B, only one first wheel 231 is provided. On the other hand, when the distance between the first main body section 20A and the second main body section 20B is reduced, storage when not in use is improved.

[0055] In the third step (Figures 2E and 2F), when inserting the insulator insertion device 20 into the inner surface of the insulator body 511, from the viewpoint of workability, it is preferable to insert it so that the side fixing the tip of the internal structure A on the mounting base 25 (conductor lead rod 544 in this embodiment), i.e., the side where the fixing belt is located, is the tip side of the insulator body 511 (right side on the page), and the side having the sliding mechanism is the rear end side of the insulator body 511 (left side on the page). In the insulator insertion device 20 of this embodiment, it is preferable to insert it so that the first main body portion 20A through which the fixing belt is inserted is the tip side of the insulator body 511, and the second main body portion 20B having the sliding mechanism is the rear end side of the insulator body 511.

[0056] By inserting the second main body portion 20B, which has a sliding mechanism, into the insulator body 511 so that it becomes the rear end, in the third step, the second main body portion 20B can be expanded while inserting the insulator insertion device 20 during the initial insertion of the tip end of the internal structure A (conductor lead rod 544 in this embodiment) into the insulator body 511. This makes it easy to adjust the length of the portion that supports the conductor lead rod 544 so that the conductor lead rod 544 inside the insulator body 511 does not bend downward. Furthermore, by inserting the first main body portion 20A, through which the fixing belt is inserted, into the insulator body 511 so that it becomes the tip end, in the fourth step described later, it becomes easier to remove the fixing belt when removing the insulator insertion device 20 from the insulator body 511, thus improving work efficiency.

[0057] In the fourth step, as shown in Figure 2G, the rear end (lower fitting 513) of the insulator body 511 is fixed to the fixing fitting 541 of the internal structure A. The insulator body 511 is suspended by an endless belt 15 and can be manually rotated around the axial direction, making it easy to align the lower fitting 513 and the fixing fitting 541. Specifically, in order to fix the rear end (lower fitting 513) of the insulator body 511 to the fixing fitting 541 of the internal structure A, it is necessary to align the bolt insertion holes provided on each. Conventionally, this work was performed simply by suspending the insulator body 511 with a crane or the like, which made the alignment work time-consuming. In contrast, in this embodiment, the insulator body 511 can be rotated, making alignment easy and greatly improving work efficiency.

[0058] Subsequently, the insulator body 511 is supported by the lifting trolley 43, and the insulator lifting device 10 is removed. At this time, by removing the pulley 12 on the side closer to the fixing bracket 541 from the beam 11, the endless belt 15 that was attached to the pulley 12 can be removed from the insulator lifting device 10. The removed endless belt 15 can be left slack and removed from the insulator body 511 as appropriate in the fifth step and beyond.

[0059] In the fifth step, as shown in Figures 2H to 2J, the upper fitting 512 is fixed to the insulator body 511 using the upper fitting mounting device 30. By using the upper fitting mounting device 30, the heavy upper fitting 512 can be easily moved horizontally to the upper flange of the insulator body 511 and fixed in place.

[0060] Specifically, with the upper fitting 512 placed on the upper fitting mounting device 30, the upper fitting mounting device 30 is brought closer to the upper opening of the insulator body 511, and the tip of the conductor lead rod 544 is inserted through the central through hole of the upper fitting 512 (see Figure 2H). Then, the lifting device 53 is connected to the suspension bolt 47 attached to the conductor lead rod 544, and the crane is used to lift it up and support the conductor lead rod 544 so that it is horizontal, and the insulator insertion device 20 is removed (see Figure 2I). Furthermore, the upper fitting mounting device 30 is brought closer to the insulator body 511, and the upper fitting 512 is fixed to the upper flange of the insulator body 511 (see Figure 2I).

[0061] Subsequently, as shown in Figure 2J, the upper fitting attachment device 30 is removed, the wire 46 pulled out from the winding device 45 is inserted into the upper fixing device 514 and connected to the conductor lead rod 544. The winding device 45 is fixed with an anchor, the wire 46 is wound up with the winding device 45, the suspension device 53 is removed while a predetermined tension is applied, and the conductor lead rod 544 is fixed to the upper fitting 512 with the upper fixing device 514.

[0062] Figures 8A to 8C show the upper fitting mounting device 30. Figure 8A is a side view of the upper fitting mounting device 30 as seen from the side. Figures 8B and 8C are front views of the upper fitting mounting device 30 as seen from the axial direction.

[0063] As shown in Figures 8A to 8C, the upper fitting mounting device 30 comprises a running section 31 and an upper fitting mounting section 32. The running section 31 has a plurality of wheels 35 and a main frame 36, and moves the upper fitting mounting device 30 along the direction of travel. The upper fitting mounting section 32 is the part on which the upper fitting 512 is placed, and is capable of holding the upper fitting 512 in a stable position.

[0064] The upper fitting mounting section 32 has a first holder 37 and a second holder 38. Two first holders 37 are arranged spaced apart in the width direction of the main frame 36. The first holders 37 have grooves (not shown) that fit the peripheral edge of the upper fitting 512, and hold the left and right peripheral edges of the upper fitting 512 by clamping them in the thickness direction. By providing multiple first holders 37, it is possible to switch between a holding state in which the upper fitting 512 is clamped and held in the width direction (see Figure 8B) and a retracted state in which the upper fitting 512 is released (see Figure 8C). The first holders 37 are attached to the main frame 36, for example, via a sliding mechanism so as to be slidable in the left-right direction, i.e., in the width direction of the upper fitting 512.

[0065] The first retainer 37 can hold the upper fitting 512 in a stable position when in the holding state. Furthermore, by moving to the retracted state, the first retainer 37 frees the front surface of the upper fitting 512. Therefore, when attaching the upper fitting 512 to the upper flange of the insulator body 511, the first retainer 37 does not get in the way, and the upper fitting mounting device 30 can be moved until the upper fitting 512 is in close contact with the upper flange, making it easy to fix the upper fitting 512.

[0066] The second retainer 38 is positioned in the center of the main frame 36 in the width direction. The second retainer 38 supports the load of the upper fitting 512. Even when the first retainer 37 is in a retracted state, the load of the upper fitting 512 is supported by the second retainer 38, so the upper fitting mounting device 30 can be moved until the upper fitting 512 is in close contact with the upper flange while the upper fitting 512 is placed on it.

[0067] The upper fitting mounting device 30 may also include a winding device 45, as shown in Figure 9. Specifically, the winding drum 451 and support rollers 452 that constitute the winding device 45 are provided on the main frame 36.

[0068] The winding device 45 winds the wire 46, which is connected to the suspension bolt 47 via the support roller 452, using the winding drum 451. The winding device 45 is positioned on the opposite side of the first holder 37 in the direction of movement of the upper fitting mounting device 30. The winding device 45 (especially the winding drum 451) is heavy and functions as a counterweight when the upper fitting 512 is placed on the upper fitting mounting section 32. Therefore, the posture stability when the upper fitting 512 is placed on the upper fitting mounting device 30 is improved, and the upper fitting mounting device 30 can be prevented from tipping over.

[0069] Thus, the assembly method of the cable termination connection unit 500 (insulator unit) according to the embodiment includes the following features, either individually or in appropriate combinations.

[0070] In other words, the assembly method for the cable termination connection part 500 (insulating pipe unit) according to this embodiment comprises: a first step (Figures 2A to 2C) of holding the internal structure A, including the insulating unit 520 and the fixing fitting 541, in a horizontal position; a second step (Figure 2D) of lifting the insulating pipe body 511; a third step (Figures 2E and 2F) of inserting the tip end of the internal structure A into the insulating pipe body 511; a fourth step (Figure 2G) of fixing the rear end of the insulating pipe body 511 to the fixing fitting 541; and a fifth step (Figures 2H to 2J) of fixing the upper fitting 512 to the tip of the insulating pipe body 511.

[0071] In this embodiment, the third step involves using a pipe insertion device 20 (an example of an assembly support device) having wheels 23, and moving the pipe insertion device 20 so that the internal structure A and the pipe body 511 move relatively in the axial direction, with the tip of the internal structure A fixed to the pipe insertion device 20.

[0072] By using the insulator insertion device 20, the conductor lead rod 544 does not come into contact with the inner surface of the insulator body 511, so the internal structure A can be easily inserted into the insulator body 511 without damaging the inner surface of the insulator body 511. Therefore, the workability and reliability when assembling the cable termination connection part 500 (insulator unit) by the horizontal assembly method can be improved.

[0073] In the assembly method for the cable termination connector 500, the insulator insertion device 20 comprises a running section 21 having a plurality of wheels 23 and an internal structure mounting section 22 on which the internal structure A can be mounted, and the plurality of wheels 23 are provided to conform to the inner surface shape of the insulator body 511. This allows the insulator insertion device 20 to run smoothly along the inner surface of the insulator body 511.

[0074] In the assembly method for the cable termination connector 500, the multiple wheels 23 include a first wheel 231 and two second wheels 232 positioned symmetrically in the circumferential direction with respect to the running axis of the first wheel 231, and support the insulator insertion device 20 at at least three points that define a plane. This improves the posture stability of the insulator insertion device 20 when it is running.

[0075] In the assembly method for the cable termination connection section 500, the insulator insertion device 20 has a first main body section 20A and a second main body section 20B, each having wheels 23, and the axial distance between the first main body section 20A and the second main body section 20B can be expanded or contracted. This improves posture stability during travel and improves storage when not in use.

[0076] In the assembly method of the cable termination connection section 500, the second main body 20B of the insulator insertion device 20 has a sliding mechanism that allows it to slide relative to the first main body 20A, and the insulator insertion device 20 travels inside the insulator body 511 with the first main body 20A at the front end and the second main body 20B at the rear end. This makes it easy to stabilize the posture of the insulator insertion device 20 when it travels inside the insulator body 511, and also makes it easy to remove the insulator insertion device 20 from the insulator body 511.

[0077] In the assembly method for the cable termination connector 500, the internal structure mounting section 22 has a mounting base 25, and the height position of the mounting base 25 relative to the running section 21 is adjustable. This allows the height position of the mounting base 25 to be adjusted so that the conductor lead rod 544 is centered on the insulator body 511, and the assembly method can be applied to cable termination connectors 500 of various sizes.

[0078] In the assembly method of the cable termination connector 500, the outer surface of the wheel 23 is formed of rubber, thermoplastic resin, or elastomer. This prevents damage to the insulator body 511 caused by the insulator insertion device 20 running along the inner surface of the insulator body 511, thereby improving the reliability of the cable termination connector 500.

[0079] Furthermore, the assembly method of the cable termination connection unit 500 (insulator unit) according to the embodiment includes the following features, either individually or in appropriate combinations.

[0080] In other words, in the assembly method of the cable termination connection part 500, the second step is to use the insulator lifting device 10 (an example of an assembly support device) to wrap the ring-shaped endless belt 15 provided on the insulator lifting device 10 around both ends of the insulator body 511 and lift it up.

[0081] The insulator body 511 is suspended by an endless belt 15 and can be manually rotated around its axis, making it easy to align the lower fitting 513 and the fixing fitting 541 in the fourth step. Therefore, the workability and reliability of assembling the cable termination connection section 500 (insulator unit) using the horizontal assembly method can be improved.

[0082] In the assembly method of the cable termination connection section 500, the insulator lifting device 10 has a beam 11 that is the same length as the insulator body 511, and pulleys 12 positioned at both ends of the beam 11, with an endless belt 15 wrapped around the pulleys 12. As a result, the pulleys 12 rotate in accordance with the rotation of the endless belt 15, so that the insulator body 511 can be easily rotated and the lower fitting 513 and the fixing fitting 541 can be easily aligned.

[0083] In the assembly method of the cable termination connection section 500, the insulator lifting device 10 has a first lifting device 16 connected to the inside of the pulley 12 in the longitudinal direction of the beam 11. This allows the same device to perform the work of lifting the insulator body 511 with the first lifting device 16 and the work of attaching the endless belt 15 to the insulator body 511.

[0084] In the assembly method for the cable termination connection section 500, the insulator body 511 is placed on the insulator support base 44 with the flange portions at both ends supported. The second step involves lifting the insulator body 511 with the first lifting device 16 and attaching the endless belt 15 to the insulator body 511 through the space formed between the insulator support base 44 and the insulator body 511. This allows the endless belt 15 to be easily attached to the insulator body 511 which is placed on the insulator support base 44.

[0085] Furthermore, the assembly method of the cable termination connection unit 500 (insulator unit) according to the embodiment includes the following features, either individually or in appropriate combinations.

[0086] In other words, in the assembly method of the cable termination connection section 500, the fifth step involves using the upper fitting mounting device 30 (an example of an assembly support device) to move the upper fitting mounting device 30 with the upper fitting 512 placed on it, inserting the tip of the internal structure A (conductor lead rod 544 in this embodiment) into the upper fitting 512, and fixing the upper fitting 512 to the tip of the insulator body 511.

[0087] By using the upper fitting mounting device 30, the heavy upper fitting 512 can be easily moved horizontally to the upper flange of the insulator body 511 and fixed in place. Therefore, the workability, safety, and reliability of assembling the cable termination connection section 500 (insulator unit) using the horizontal assembly method can be improved.

[0088] In the assembly method for the cable termination connection section 500, the upper fitting mounting device 30 has a first retaining body 37 that holds the left and right peripheral edges of the upper fitting 512 by clamping them in the thickness direction, and the first retaining body 37 can be switched between a holding state that holds the upper fitting 512 and a retracted state that releases the upper fitting 512. This allows the upper fitting 512 to be held in a stable position. Furthermore, there is no need to lift the upper fitting 512 with a crane, and the upper fitting 512 can be easily fixed to the outer pipe body 511 by retracting the first retaining body 37.

[0089] In the assembly method of the cable termination connection section 500, the first retainer 37 is slidable in the left-right direction relative to the main frame 36 (slidable in the width direction of the upper fitting 512). This allows for easy switching between the retained state and the retracted state of the first retainer 37.

[0090] In the assembly method for the cable termination connection section 500, the upper fitting mounting device 30 has a second holder 38 that receives the weight of the upper fitting 512. This allows the upper fitting mounting device 30 to be moved while holding the upper fitting 512, even after the first holder 37 has been retracted.

[0091] In the assembly method for the cable termination connection section 500, the upper fitting attachment device 30 has a winding device 45 for winding the wire 46 connected to the tip of the internal structure A (conductor lead rod 544 in this embodiment). This makes it possible to perform the work of fixing the upper fitting 512 and the work of applying tension to the conductor lead rod 544 and fixing it with a single device.

[0092] In the assembly method of the cable termination connection section 500, the first holder 37 is positioned on one end in the direction of movement, and the winding device 45 is positioned on the other end in the direction of movement. This allows the posture of the upper fitting mounting device 30 to be stabilized when the heavy upper fitting 512 is placed on it.

[0093] Although the present invention has been specifically described above based on embodiments, the present invention is not limited to the above embodiments and can be modified without departing from its spirit.

[0094] For example, in the embodiments described above, an example was described in which the insulator unit to which the present invention can be applied is a cable termination connection part. However, the invention is not limited to this, and for example, the insulator unit may be an equipment bushing (also called an "equipment through bushing"). The equipment side of the equipment bushing has a known shape that can accommodate oil insulation and / or gas insulation, and can be used for transformers or GIS (gas-insulated switchgear).

[0095] In the insulator insertion device 20, the wheel support 24 of the running section 21 may function as a mounting platform for the conductor lead rod 544. In the insulator insertion device 20, the height position of the mounting platform 25 may be fixed. When inserting the internal structure A into the insulator body 511 using the insulator insertion device 20, the insulator body 511 may be fixed and the internal structure A may be moved in the axial direction.

[0096] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0097] 10. Lifting device for pipes (assembly support device) 11 Beam 12 Pulley 13. First suspension device connection section 15 Endless belt 16. First lifting device 20. Insulator insertion device (assembly support device) 21 Running section 22 Internal structure placement part 23 wheels 25 Mounting platform 30 Upper fitting mounting device (assembly support device) 31 Running section 32 Upper fitting mounting section 35 wheels 36 Main frame 37 First holding body 38 Second holding body 45 Winding device 500 Cable termination connection unit (insulating pipe unit) 510 Insulator 511 Insulator body 512 Upper fitting 513 Lower fitting 520 Insulation Unit 544 Conductor lead rods A internal structure

Claims

1. A first step of holding the internal structure, including the insulating unit and fixing brackets, in a horizontal position, The second step is to lift the main body of the pipe, A third step involves inserting the tip end of the internal structure into the main body of the outer pipe, A fourth step involves fixing the rear end of the insulator body to the fixing bracket, The fifth step involves fixing an upper fitting to the tip of the main body of the insulator, The third step involves using an assembly support device for inserting an outer pipe that has wheels, fixing the tip of the internal structure to the assembly support device, and moving the assembly support device so that the internal structure and the outer pipe body move relatively in the axial direction. How to assemble the pipe unit.

2. The assembly support device comprises a running section having a plurality of wheels and an internal structure mounting section on which the internal structure can be mounted, Multiple wheels are provided to conform to the inner surface shape of the outer pipe body. A method for assembling the pipe unit according to claim 1.

3. The plurality of wheels include a first wheel and two second wheels positioned symmetrically in the circumferential direction with respect to the running axis of the first wheel, and support the internal structure mounting portion at at least three points that define a plane. The method for assembling the pipe unit according to claim 2.

4. The running section comprises a first main body having the wheels and a second main body having the wheels, and the axial distance between the first main body and the second main body can be expanded or contracted. A method for assembling the pipe unit according to claim 3.

5. The second main body has a sliding mechanism that allows it to slide relative to the first main body. The assembly support device travels inside the outer pipe body with the first main body towards the front end and the second main body towards the rear end. The method for assembling the pipe unit according to claim 4.

6. The internal structure mounting section has a mounting base, The height position of the aforementioned mounting base relative to the traveling section is adjustable. The method for assembling the pipe unit according to claim 2.

7. The outer surface of the wheel is formed of rubber, thermoplastic resin, or elastomer. A method for assembling the pipe unit according to claim 1.

Images