JPH1118240A - Clean room for assembling connection for power cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damages to a partition and opening sections by forming, in the partition parts, the opening sections for passing a pair of power cables through, and provided each of the opening sections with a bellows structure, which shrinks and contracts along with the displacement of the power cable and displaces in the diametrical direction of the cross section of the power cable. SOLUTION: In opening sections for passing a pair of power cables 1 to be passed through in the parts of a partition 28 made of a sheet material having flexibility, through-holes 33 which are larger than the cross sections of respective cables 1 are formed. Around the through-holes 33, in the manner of a loop-and- hook tape attachment elements 34 are pasted over the entire periphery. In order to cover a space formed between the outer face of the power cable and an inner edge of each through-hole 33 when the power cable 1 is passed through the through-hole 33, a covering member 36 is installed. The covering member 36 is constituted of a covering pipe 37 made larger than the through-hole 33, and a bellows structure 38, which is located at the center of the covering piece 37 and displaces in the diameter direction of the cross section of the power cable 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The clean room for assembling a power cable connecting portion according to the present invention is used for connecting ends of a high-voltage cable for power transmission, and foreign matter such as dust is attached to the connecting portion. To prevent

[0002]

2. Description of the Related Art To provide a high-voltage transmission line of several hundred thousand volts in an underground tunnel, a power cable for power transmission is disposed in the underground tunnel. Then, ends of the power cables arranged in series with each other are connected in an underground tunnel. As described above, as a structure of a connecting portion for connecting ends of a power cable in an underground tunnel and an assembling apparatus for assembling the structure of the connecting portion, a conventional structure is disclosed in Japanese Patent Application Laid-Open No. Hei 9-117.
No. 029 is known. FIG.
Indicates a power cable connecting portion described in this publication.

[0003] A pair of power cables 1 to be connected to each other,
The ends of the conductors 2 and 2 are exposed by removing a predetermined length of the corrugated outer layers 3 and 3 and the semiconductive layers 4 and 4 and the insulators 5 and 5 at the end of the conductor 2. The conductor connection members 6 and 6 and the coupling members 7 and 7 are fixed to the end portions of the second member 2, respectively. Of these, the conductor connection member 6,
Reference numeral 6 is made of a metal having good conductivity such as copper or a copper alloy, and is used for electrical connection between the conductors 2 and 2.
Each of the coupling members 7, 7 is, for example, disclosed in
It is generally known from the related art described in, for example, Japanese Patent Application Publication No. 307421, and is mainly composed of a metal having high mechanical rigidity such as stainless steel. As a result, they are connected to each other and become inseparable after the connection, so that the mechanical connection strength between the conductor connection members 6 is secured. The coupling members 7 and 7 and the conductor connection members 6 and 6 are connected to the conductors 2 and
The work of fixing to the end of No. 2 is performed as shown in FIGS. 9 (A) to 9 (C).

First, as shown in FIG. 9 (A), the outer corrugated layers 3 and 3 and the semiconductive layers 4 and 4 are removed at the ends of the pair of power cables 1 and 1 to form an insulator 5. 5 are exposed by the desired length. At this time, the bending habit of the power cables 1 and 1 pulled out from the drum is removed in advance. Next, as shown in FIG.
Of the conductors 2 and 2 are exposed by a desired length, and the remaining insulators 5 and 5
The tapered conical surfaces 8, 8 are formed. Next, as shown in FIG. 2C, the coupling members 7 are attached to the ends of the conductors 2 and 2 and the conductor connection members 6 and 6 are attached to the ends of the conductors 2 and 2.
Fixed through. That is, each of these conductor connection members 6, 6
After inserting the distal ends of the conductors 2 and 2 into the connecting cylinders 9 and 9 provided in the base half of the above, each of the connecting cylinders 9 and 9 is plastically deformed in a direction to reduce the diameter. Conductor connection member 6,
6 and the tip of each of the conductors 2, 2. Further, the holding cylinder 10 provided in the first half of each of the conductor connection members 6, 6.
After the coupling members 7, 7 are inserted into the holding member 10, the holding cylinder portions 10, 10 are plastically deformed in a direction to reduce the diameter, and the coupling members 7, 10 are connected to the conductor connection members 6, 6, respectively. , 7 are held and fixed.

When the conductor connecting members 6, 6 and the coupling members 7, 7 are fixed to the end portions of the conductors 2, 2 as described above, as shown in FIG. Then, these conductor connection members 6 and 6 and the coupling members 7 and 7 are inserted inside the insulating block 11. Then, these coupling members 7, 7 are engaged with each other at an intermediate portion inside the insulating block 11, as shown in FIG.
A conductor contact member 12 made of a metal having good conductivity such as copper is provided at an intermediate portion inside the insulating block 11 so as to electrically connect the pair of conductor connection members 6 to each other.
And a high-voltage shield electrode 13. The center hole 14 of the insulating block 11 supports and fixes the conductor contact member 12 and the high-voltage shield electrode 13 at the center thereof. In order to facilitate the insertion of the insulators 5 and 5 exposed in the portions, the outer diameters of the insulators 5 and 5 are slightly larger. Therefore, if each of the insulators 5, 5 is inserted into the insulating block 11, this insulating block 11
The semiconductive layer 16 is coated on the outer peripheral surface of the reinforcing insulating layer 15, and the insulating block 11 is heated so that the inner peripheral surface of the reinforcing insulating layer 15 and the outer peripheral surface of each of the insulators 5 and 5 adhere to each other. Let it.

As described above, the pair of power cables 1, 1
Conductors 2 and 2 are connected to each other via the conductor connection members 6 and 6 and the coupling members 7
When the semi-conductive layer 16 is coated on the outer peripheral surface of the reinforcing insulating layer 15 and the inner peripheral surface of the reinforcing insulating layer 15 and the outer peripheral surfaces of the insulators 5 and 5 are brought into close contact with each other. If
The periphery of the insulating block 11 is covered with a waterproof mixture 17,
Further, the periphery of the waterproof mixture 17 is covered with a protective cylinder 18. An axially intermediate portion of the protective cylinder 18 is connected to an insulating cylinder 19. Similarly, both ends of the protective cylinder 18 and the corrugated outer layers 3 and 3 forming the outermost layers of the power cables 1 and 1 are connected. Are provided with waterproof layers 20, 20, respectively.

Although the power cables 1 and 1 have flexibility, they have considerably high rigidity. In addition, when foreign matter such as dust enters the inside of the insulating block 11 at the time of assembling the connection portion for the power cable, it causes insulation failure and noise. Therefore, as shown in FIGS. 9D and 9E, the operation of inserting the conductor connection members 6 and 6 and the coupling members 7 and 7 into the insulating block 11 is performed according to the method described in Japanese Unexamined Patent Application Publication No.
This is performed in a greenhouse-like clean room using an assembling apparatus as described in JP-A-117029.
FIGS. 10 to 11 show a state in which an assembling device 22 is installed in the clean room 21 in order to assemble the power cable connecting portion.

[0008] The clean room 21 is made of vinyl or the like.
A pair of side walls 23, 23, which are made of a flexible sheet material that does not allow dust to pass through, are provided in the width direction (the vertical direction in FIG. 10), and are separated from each other. , 23, a pair of end wall portions 24, 24 that make both end edges continuous with each other in the length direction (left-right direction in FIGS. 10 to 11);
A ceiling portion 25 is provided to cover an upper part of a space surrounded by four sides by the both end wall portions 24, 24 and the both side wall portions 23, 23. These end walls 24, 24 and both side walls 23,
An assembling apparatus 22 for assembling a power cable connection part by using a space 27 surrounded by a ceiling 23, a ceiling 25, and a floor surface 26 such as an underground tunnel as a clean space by the action of a filter and a blower (not shown). There is no foreign matter such as dust around the area. In the illustrated example,
A partition 2 is provided at the middle portion of the space 27 near both ends in the length direction.
The space 27 is divided into a main clean room 29 at the center in the longitudinal direction and sub-clean rooms 30 at the both ends in the longitudinal direction.

The assembling apparatus 22 is installed in a main clean room 29. Each of the sub-clean rooms 30, 30 is used as a kind of air shower room for an operator to change clothes or to take in and out the equipment while maintaining the cleanliness in the main clean room 29. The distal ends of the pair of power cables 1, 1 to be joined to each other are inserted into the main clean room 29 through the end walls 24, 24 and the partitions 28, 28, respectively. And, the above-mentioned assembling device 22 is supported and fixed on the upper surfaces of the cable support tables 31, 31. These two cable support tables 31, 3
1 moves in the width direction or the length direction according to the progress of the assembly work of the power cable connecting portion. The insulating block 11 for constituting the power cable connecting portion is supported and fixed on the upper surface of a block supporting table 32 provided between the cable supporting tables 31. The block support table 32 moves in the length direction according to the progress of the assembling work of the power cable connecting portion.
In addition, the penetrating portions through which the power cables 1 and 1 penetrate the end wall portions 24 and 24 and the partitions 28 and 28 are closed with an adhesive tape or the like, and dust or the like enters the clean room 21 through the penetrating portions. Has been prevented. Note that the periphery of the clean room 21 is surrounded by an outer frame tent 41 made of a sheet material subjected to an antistatic treatment.

[0010]

A pair of power cables 1 and 1 in a clean room 21 as shown in FIGS.
When the power cable connecting portion is assembled to connect the power cables, the power cables 1 and 1 are oriented in their respective axial directions or in directions perpendicular to the axes (diameters in cross section, vertical direction in FIG. 10). Displace. Then, with this displacement, the penetrating portions provided on the end walls 24, 24 and the partitions 28, 28 are displaced. On the other hand, the end walls 24, 24 and the partitions 28, 28 constituting the conventional clean room 21 are merely displaced based on the flexibility and elasticity of vinyl, and actively displace the penetrating portions. No acceptable structure was provided.

For this reason, when the power cable 1 is displaced in the axial direction in order to perform the work of assembling the connection portion for the power cable, as shown in FIG. 12, the partition 28 (and the end wall portion 24) becomes As shown in FIG. 12, the partition 28 (and the end wall 24) is deformed by being pulled by the penetrating portion, and the tension of the partition 28 (and the end wall portion 24) is increased. In this state, if the power cable 1 is displaced in a direction perpendicular to the axis based on a change in offset or the like, an excessive force acts on the partition 28 (and the end wall portion 24),
There is a possibility that the partition 28 (or the end wall portion 24) is torn or the adhesive tape at the penetrating portion is peeled off. That is,
The end of the power cable 1 is offset with respect to a portion near the center so that the end can be displaced in the axial direction, but the shape of the offset portion changes with the progress of the assembling work. However, there is a possibility that the penetrating portion is displaced in a direction perpendicular to the axis. When the partition 28 (or the end wall portion 24) is torn or the adhesive tape at the penetrating portion peels off in this way, foreign matter enters the clean room 21 and the quality of the power cable connecting portion is deteriorated. Therefore, countermeasures are desired because the risk of deterioration may increase. The clean room for assembling the power cable connecting portion of the present invention was invented in view of such circumstances.

[0012]

The clean room for assembling the connection portion for the power cable according to the present invention can pass through the dust like the above-described clean room for assembling the connection portion for the power cable. A pair of side walls formed of a flexible sheet material that is not allowed to be spaced apart from each other in the width direction, and a pair of end walls configured to connect the longitudinal ends of the pair of side walls to each other. Or, a partition and a ceiling that blocks an upper part of a space surrounded by four sides by the both end walls or the partition and the both side walls are provided. A penetrating portion is provided in a part of each of the end wall portions or the partition so as to penetrate a portion of the pair of power cables to be connected to each other near the front end of the middle portion. In particular, in the clean room for assembling the power cable connecting portion according to the first aspect, the penetrating portion expands and contracts in accordance with the displacement of each of the power cables and displaces in the diameter direction of the cross section of each of the power cables. A bellows structure is provided. Further, in the clean room for assembling the power cable connecting portion according to the second aspect, the end walls or the partitions are slackened. In addition, when the end wall and the partition exist in the clean room, it is preferable to provide the bellows structure portion or to have a large slack in both of them, but if at least one of them is provided, the minimum cleanliness can be maintained. I can do it. In this case, it is preferable to provide the bellows structure portion in the partition directly facing the main clean room in which the assembling work is performed, or to have a large slack.

[0013]

In the clean room for assembling the power cable connecting portion of the present invention constructed as described above, even if the power cable is displaced in the axial direction, if the tension of each end wall or partition is large, In addition, even when the power cable is displaced in a direction perpendicular to the axis, no excessive force is applied to the end walls, the partitions, and the penetrating portions. Therefore, it is possible to prevent the end walls, the partitions, and the penetrating portions from being damaged, thereby ensuring the quality of the power cable connecting portion assembled in the clean room.

[0014]

1 to 5 show a first example of an embodiment of the present invention corresponding to claim 1. FIG. It should be noted that a feature of the present invention is that the power cable 1 has a function of absorbing the displacement of the power cable 1 in a penetrating portion that penetrates the end wall 24 (see FIG. 10) and the partition 28 near the front end of the power cable 1. There is in the structure to have. Since the structure and operation of the other parts are the same as those of the conventional structure shown in FIGS. 10 to 11, the illustration and description of the equivalent parts are omitted or simplified, and the following description will focus on the characteristic parts of the present invention. I do. The illustrated example shows a state in which the present invention is applied to a penetrating portion provided in the partition 28. However, end wall 2
4 (FIG. 10) can also be configured in the same manner as in the case of the partition 28, so the following description will be made in the case where the through-hole is provided in the partition 28.

As shown in FIGS. 2 and 4, a part of the partition 28 made of a flexible sheet material that does not allow dust to pass therethrough, such as a vinyl sheet, through which the power cable 1 is to penetrate. A through hole 33 that is sufficiently larger than the cross section of the power cable 1 is formed. An attaching element 34 such as a magic tape (trade name) is attached around the entire circumference of the through hole 33. On the other hand, in a state in which the power cable 1 is inserted through the through hole 33, a gap 35 between the outer peripheral surface of the power cable 1 and the inner peripheral edge of the through hole 33 is closed, so that as shown in FIGS. A closing member 36 is provided. The closing member 36 is made of a flexible sheet material such as vinyl which does not allow dust to pass therethrough.
It is composed of a closing piece 37 made larger and a bellows structure 38 provided at the center of the closing piece 37.

At the center of the closing piece 37, there is provided an inner through hole 39 through which the power cable 1 can be loosely inserted.
The base edge of the bellows structure 38 is airtightly connected to the periphery of the inner through-hole 39. The bellows structure portion 38 is tapered in a substantially conical shape in a direction in which the diameter decreases toward the tip, and the power cable 1 is attached to the tip.
Can be inserted freely. In a state where the power cable 1 is inserted through the tip of the bellows structure 38, the outer peripheral surface of the power cable 1 and the inner periphery of the tip of the bellows structure 38 are connected by the elasticity of the bellows structure 38 itself. Alternatively, airtightness can be freely maintained by tightening a clamp (not shown) or attaching an adhesive tape such as an antistatic tape. Further, at a portion near the outer periphery of one surface of the closing piece 37 and opposed to the attachment element 34, another attachment element 40 detachable from the attachment element 34 is attached along the entire circumference. doing. Then, in a state where the two adhering elements 34 and 40 are attached to each other, the joint between the partition 28 and the closing piece 37 can be kept airtight enough to prevent entry of foreign matter. In addition, the attachment element 3 such as a magic tape
If it is not possible to maintain sufficient airtightness only by bonding the pieces 4 and 40 together, the gap between the outer peripheral edge of the closing piece 37 and one surface of the partition 28 may be replaced with Velcro or Along with the magic tape, it may be covered with other attaching means such as an adhesive tape.

The clean room for assembling the power cable connecting portion of the present invention configured as described above is provided with the bellows structure 3
8, the displacement of the power cable 1 can be absorbed. That is, when the power cable 1 is displaced in the axial direction, the bellows structure part 38 expands and contracts. When the power cable 1 is displaced in the direction perpendicular to the axis (diameter direction of the cross section), the bellows structure 38 is displaced. The tip of the portion 38 follows this displacement. Accordingly, the displacement of the power cable 1 is not transmitted to the closing piece 37 of the closing member 36 and further to the partition 28, and the tension of the partition 28 does not increase. Therefore, even when the power cable 1 is displaced in a direction perpendicular to the axis, the main body of the partition 28 and the closing member 36
No unreasonable force is applied to the penetrating support part constituted by. As a result, the partition 28 and the penetrating support portion are prevented from being damaged, foreign matter such as dust is prevented from entering the clean room 21, and the quality of the power cable connecting portion assembled in the clean room 21 is reduced. Can be secured.
The direction in which the bellows structure 38 is installed with respect to the partition 28, that is, whether the bellows structure 38 protrudes toward the main clean room 29 or the auxiliary clean room 30 can be freely determined.

Next, FIG. 6 shows a second embodiment of the present invention corresponding to claim 1. In the first example described above, the bellows structure portion 38 is formed by the closing member 36 which is separate from the partition 28.
In the case of this example, the bellows structure portion 38a is provided in the partition 28a itself, as opposed to the bellows structure portion shown in FIGS. Therefore, in the case of this example, unlike the case of the first example, the labor for connecting the closing member 36 and the partition 28 (FIGS. 2 and 4) is unnecessary. Further, it is not necessary to consider maintaining the airtightness of the joint between the closing member 36 and the partition 28. Further, the bellows structure part 38a is enlarged so that the bellows structure part 38
a can be increased. Therefore, even when the displacement amount of the power cable 1 becomes large, this displacement can be reliably absorbed. Other configurations and operations are the same as those of the above-described first example.

FIG. 7 shows a third embodiment of the present invention corresponding to claim 2. In the case of this example, a large slack is given to the entire partition 28b.
That is, the entire partition 28b has a three-dimensional shape such as a quadrangular pyramid. Therefore, even when the power cable 1 penetrating through the central portion of the partition 28b is displaced, the partition 28b absorbs this displacement based on its own deformation and prevents the tension of the partition 28b from increasing. And, irrespective of the displacement of the power cable 1, the partition 28b is prevented from being broken or the penetrating portion of the power cable 1 is prevented from being damaged.

[0020]

As described above, the clean room for assembling the power cable connecting portion of the present invention is constructed and operates as described above. Therefore, the cleanliness of the working space is maintained, and the power cable connecting portion of stable quality is maintained. It can contribute to realization.

[Brief description of the drawings]

FIG. 1 is a partial schematic perspective view showing a first example of an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing only a partition constituting the first example.

FIG. 3 is a schematic perspective view of a penetrating portion in which a bellows structure is similarly incorporated.

FIG. 4 is a schematic perspective view showing a state where a partition, a through portion, and a power cable are combined.

FIG. 5 is a schematic longitudinal sectional view showing a state in which the power cable is displaced in the axial direction in a state where the partition, the through portion, and the power cable are combined.

FIG. 6 is a partial schematic perspective view showing a second example of the embodiment of the present invention.

FIG. 7 is a partial schematic perspective view showing the third example.

FIG. 8 is a cross-sectional view showing an example of a power cable connecting portion.

FIG. 9 is a partial cross-sectional view sequentially showing an assembling process of a power cable connecting portion.

FIG. 10 is a schematic plan view showing a state in which a power cable connecting section is assembled using an assembling apparatus installed in a clean room.

FIG. 11 is a sectional view taken along line AA of FIG. 10;

FIG. 12 shows a state in which the power cable is displaced in the axial direction;
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power cable 2 Conductor 3 Corrugated outer layer 4 Semiconductive layer 5 Insulator 6 Conductor connection member 7 Coupling member 8 Conical surface 9 Coupling cylinder part 10 Holding cylinder part 11 Insulation block 12 Conductor contact member 13 High voltage shield electrode 14 Center hole 15 Reinforcement Insulating layer 16 Semiconductive layer 17 Waterproof mixture 18 Protective cylinder 19 Insulating cylinder 20 Waterproof layer 21 Clean room 22 Assembly device 23 Side wall 24 End wall 25 Ceiling 26 Floor 27 Space 28, 28a, 28b Partition 29 Main clean room 30 Secondary Clean room 31 Cable support table 32 Block support table 33 Through hole 34 Attached element 35 Gap 36 Closing member 37 Closing piece 38, 38a Bellows structure part 39 Inner through hole 40 Attached element 41 Outer frame tent

Claims (2)

[Claims] 1. A pair of side walls formed of a flexible sheet material that does not allow dust to pass therethrough and provided in the width direction and separated from each other in the longitudinal direction by a pair of side walls. A pair of end walls or partitions to be continuous, and a ceiling that blocks an upper part of a space surrounded by four sides by the both end walls or partitions and the side walls, and a part of each of the end walls or partitions. A power cable connecting portion provided in a clean room for assembling a power cable connecting portion, wherein each of the power cables is connected to the power cable connecting portion. A clean room for assembling a connection portion for a power cable, comprising a bellows structure portion which expands and contracts with the displacement of the power cable and is displaced in the diameter direction of the cross section of each of the power cables. 2. A pair of side walls formed of a flexible sheet material that does not allow dust to pass therethrough and spaced apart in the width direction, and the longitudinal ends of the pair of side walls are attached to each other. A pair of end walls or partitions to be continuous, and a ceiling that blocks an upper part of a space surrounded by four sides by the both end walls or partitions and the side walls, and a part of each of the end walls or partitions. In the clean room for assembling the power cable connecting portion, each of which has a penetrating portion which penetrates a portion of the pair of power cables to be connected to each other near the front end of the power cable, each of the end walls or the partition is loosened. Clean room for assembling power cable connections, characterized by having