JP2001145250A - Assembling method for cable connecting portion and cable connecting member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembling method for cable connecting portions which allows a connection to be easily formed even in a small working space and a connecting member for use in the method. SOLUTION: The assembling method for cable connections is for inserting a cable terminal into an insulating tube from both its ends. Male hardware 20 is fit onto one cable terminal 2A. Female hardware 21 is fit onto the other cable terminal 2B. Both the cable terminals 2A and 2B are inserted into an insulating tube, and the male hardware 20 and the female hardware 21 are connected with each other. A waterproof protective layer 35 turned up from both the ends toward the circumference and rolled in is positioned on the periphery of the insulating tube 1. The waterproof protective layer 35 rolled in is returned to the original state to cover the portions of the insulating tube 1 and the cable in proximity to the insulating tube 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a power cable connecting portion and a connecting member used for the connecting portion.

[0002]

2. Description of the Related Art There are various types of connection parts for power cables, and one of them is a self-shrink type connection part using an insulating cylinder. The assembling procedure is as follows.
First, an insulating tube whose diameter has been increased is fitted into the outer periphery of one end of the cable and released. Next, after the conductor at the end of the cable is compression-connected, the insulating cylinder is positioned above the compression connection. Then, the diameter increasing jig is removed, and the insulating tube is mounted on the cable by the self-contracting force of the insulating tube to form a cable connection portion.

[0003]

However, there has been a problem that such a method of assembling the connecting portion cannot be used when the working space is small. For example, a work space formed underground is a cylindrical or rectangular parallelepiped space, and a cable outlet is formed at a position facing a side wall of the work space. The end of each cable is exposed from the outlet hole, and a connection is formed in the working space. At this time,
In general, the inner diameter of the lead hole is larger than the outer diameter of the cable, but smaller than the outer diameter of the connecting member such as the insulating tube, and the distance between the opposing side walls is short. No space.

Accordingly, it is a primary object of the present invention to provide an assembling method capable of easily forming a connecting portion even when a work space is narrow, and a connecting member used in this method.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a method of assembling a connecting portion according to the present invention employs a method in which cable ends are inserted from both sides of an insulating tube, and a waterproof protective layer covering the outer periphery of the connecting portion. The holding mode is devised.
That is, the assembling method of the present invention is characterized in that the assembling method of the cable connecting portion formed by inserting the cable ends from both ends of the insulating tube includes the following steps.

A: A step of attaching a male fitting to one end of the cable. b: A step of attaching a female metal fitting to the other cable end. c: A step of inserting both cable ends into the insulating cylinder to connect the male and female fittings. d: a step of positioning the waterproof protective layer, which is turned up from at least one end to the outer peripheral side and wound around, at the outer periphery of the insulating cylinder. e: a step of returning the entrained waterproof protective layer to its original state and covering the insulating cylinder and a portion of the cable near the insulating cylinder.

Here, the step of positioning the waterproof protective layer on the outer periphery of the insulating cylinder includes the following two methods.

[0008] The waterproof protective layer is previously fitted in a state where it is wound around the outer periphery of the core having an inner diameter larger than the outer diameter of the insulating cylinder. And before inserting both cable ends into the insulation tube,
The core is inserted from one end of the cable and once escaped to the cable root side, and after the male and female fittings are connected, the core is moved to the outer periphery of the insulating cylinder. The waterproof protection layer is previously set in a state of being wound around the outer periphery of the insulating cylinder.

The connecting member of the present invention used in the above-mentioned assembling method has a core having an inner diameter larger than the outer diameter of the insulating tube, and a waterproof protection which is fitted on the outer periphery of the core and turned up from at least one end to the outer peripheral side to be wound. And a layer.

[0010] Instead of providing the waterproof protective layer around the outer periphery of the core, the waterproof protective layer may be provided directly around the outer periphery of the insulating cylinder.

The material of the waterproof protective layer is preferably a material having sufficient flexibility, for example, silicone rubber. Further, the thickness is excellent in mechanical protection when it is thick, but it is difficult to turn it up to the outer peripheral side and roll it up, so that it is desirable to be about 3 mm or less.

Further, another feature of the present invention is that instead of using a connecting member having a waterproof protective layer turned up and wound around the outer periphery of the core, a connection having a waterproof protective layer fitted in the inner and outer double cores. To use a member. That is, a method of assembling a cable connecting portion formed by inserting a cable end portion from both ends of an insulating tube is characterized by comprising the following steps.

F: an inner core, an outer core fitted on the outer side of the inner core, and a waterproof protective layer, one end of the waterproof protective layer being fitted on the outer side of the inner core and being folded back. A step of preparing a cable connecting member whose end side is fitted to the outside of the outer core, and positioning the connecting member at one end side of the insulating cylinder with the inner core fitted to the outside of the cable. g: a step of moving the outer core to the other end of the insulating cylinder and covering a part of the waterproof protective layer on the insulating cylinder. h: a step of moving the inner core to one end of the insulating tube to cover a portion of the insulating tube and the cable adjacent to the insulating tube.

According to this method, the waterproof protective layer can be covered on the insulating cylinder by a simple operation of moving the outer core and the inner core in the cable axial direction.

The connecting member includes an inner core, an outer core fitted to the outside of the inner core, and a waterproof protection layer, and one end of the waterproof protection layer is fitted to the outside of the inner core and folded. The other end of the waterproof protection layer is fitted outside the outer core.

Here, the turning point where the inner diameter of the inner core is equal to or slightly smaller than the outer diameter of the large-diameter portion to be covered and the outer diameter of the waterproof protective layer becomes smaller is defined as a turning position, and this turning position is defined as the end of the inner core. It is preferable to make it correspond substantially to the part. With this configuration, it is possible to cover the change of the diameter of the insulating cylinder in correspondence with the change of the diameter of the waterproof protective layer.

Further, if a plurality of grooves extending from one end to the other end are formed in each of the inner and outer cores, a part of each of the inner and outer cores sandwiched between the grooves is removed as broken fragments, thereby enabling the outer circumferential direction of the cable to be removed. The core can be removed.

[0018]

Embodiments of the present invention will be described below. (Embodiment 1) FIGS. 1 to 4 are explanatory views of the assembling method of the present invention. In this assembling method, as shown in FIG. 1, a connection portion is formed by inserting cable ends 2A and 2B from both sides of the insulating tube 1. At the time of forming the connection part, as shown in FIG. 3, the wound waterproof protective layer 35 is previously fitted on the outer periphery of the core 36, and the core 36 is fitted on the outer periphery of one of the cable ends to release. Keep it. The waterproof protective layer 35 and the core 36 will be described later.

The insulating cylinder 1 is a cylindrical body whose both ends are tapered, and includes an inner semiconductive layer 3, an insulating layer 4, and an outer semiconductive layer 5 in order from the center side to the outer peripheral side. A band-shaped copper braided wire 6 is spirally wound around the outer periphery of the outer semiconductive layer 5.
Then, a heat-shrinkable tube 7 is applied to the outer periphery of the copper braided wire 6, and both ends of the copper braided wire 6 are bent to the outer peripheral side of the heat-shrinkable tube 7 before the cable end is inserted.

On the other hand, the cable ends 2A and 2B are stripped of the coating, and the conductor 10, the insulator 11, the outer semiconductive layer 12, the shielding layer 13,
The sheath 14 is exposed in a stepwise manner. A male fitting 20 is attached to one conductor end, and a female fitting 21 is attached to the other conductor end. Both brackets 20, 21 are male bracket 20
Are inserted into the female metal fittings 21 so that they are engaged with each other and do not easily fall off. That is, the female fitting 21
Is formed with an inner peripheral projection 22, and the inner peripheral projection 22 is connected to the outer peripheral groove 23 of the male metal fitting 20 by engaging with the inner peripheral projection 22. Then, the semiconductive tape 25 is wound around a region from the end of the shielding layer 13 to the position above the insulator 11.

The cable ends 2A and 2B are inserted from both sides of the insulating tube 1 (FIG. 2), and the male fitting 20 and the female fitting 21 are engaged. At this time, the semiconductive tape 25 and the external semiconductive layer 5 of the insulating cylinder 1 are in contact and are electrically connected. Next, the copper braided wire 6 folded back to the outer peripheral side of the heat-shrinkable tube 7 is returned, and its end is connected to the shielding layer 13 of each cable.

Next, the insulating tape is wound in a tapered shape from both ends of the insulating tube 1 onto the sheath 14 of each cable to form an insulating tape winding layer 30 (FIG. 3).

Thereafter, the waterproof protective layer 35 and the core 36, which have been fitted on the outer periphery of one of the cables and escaped, are moved and positioned on the insulating cylinder 1 (FIG. 3). The waterproof protection layer 35 is a cylindrical body whose both ends are tapered, and is made of silicone rubber. The middle portion has a uniform diameter, and only the both end portions are configured to have a smaller diameter toward the opening corresponding to the outer shape of the insulating tape winding layer 30. The inner diameter of the intermediate portion is slightly smaller than the outer diameter of the insulating tube 1, and the inner diameter of the opening at both ends is slightly smaller than the outer diameter of the cable. Such a waterproof protective layer 35 is fitted on the outer periphery of the core 36, and is turned up from both ends to the outer periphery to be wound. In order to prevent the wound state from returning to the original state, it is preferable to fit a holding metal fitting (not shown) having a concave cross section from both ends of the waterproof protective layer, that is, the wound part from the outer peripheral side of the cable. The core 36 is formed by combining two semi-cylindrical pieces into a cylindrical body, and has an inner diameter slightly larger than the outer diameter of the insulating cylinder 1.

The core 36 is pulled out of the combination of the waterproof protective layer 35 and the core 36. The pulled-out core 36 is divided and removed around the cable. Then, the wound waterproof protective layer 35 is returned to its original state, and the area from the insulating tube 1 to the outer periphery of the cable is covered with the waterproof protective layer 35 (FIG. 4).

According to the above assembling method, since the cable ends 2A and 2B are inserted from both sides of the insulating tube 1, the insulating tube is connected to the cable as in the case of using the conventional enlarged diameter insulating tube. There is no need to escape to one side. Also,
In the method of the present invention, it is necessary to release the waterproof protective layer attached to the core in place of the insulating tube to one side of the cable, but since the waterproof protective layer is turned up to the outer peripheral side and wound up. In addition, the length in the axial direction is short, and the distance required for escape is much shorter than in the case where the insulating cylinder itself is escaped. Furthermore, since the waterproof protective layer is an integral member, unlike tape winding, there is no gap, and high waterproofness can be easily realized.

In this case, the waterproof protective layer is fitted on the outer periphery of the core, and the cable end is released on one of the cables before inserting the cable into the insulating tube. It may be fitted and a state in which a waterproof protective layer is attached to the outer periphery thereof. In this case, since there is no cable connecting member to be released on one of the cables, the forming operation of the connecting portion can be easily performed even when the working space is narrower.

In addition, as shown in FIG. 5, the waterproof protective layer may be divided into two, and two short waterproof protective layers may be used. In this method, a first core 40 and a second core 41 are prepared, and the first waterproof protective layer 42 and the second waterproof protective layer 43 are wound around the cores 40 and 41, respectively. . The inner diameter of the first core 40 is slightly larger than the outer diameter of the insulating cylinder 1, and the inner diameter of the second core 41 is the first waterproof protective layer 42 fitted on the outer circumference of the first core 40.
Slightly larger than the outside diameter of In this case, each waterproof protective layer 42,
Reference numeral 43 denotes a state in which only one end is turned up to the outer peripheral side and wound.

The combined body of the first and second cores 40 and 41 and the first and second waterproof protective layers 42 and 43 is escaped to one end of the cable, and the first core 40 is first extracted, and the first waterproof protective layer is removed. 42
To cover from about half of the insulating tube 1 (right half in FIG. 6) to the outer periphery of the cable. Next, the second core 41 is pulled out, the second waterproof protective layer 43 is rewound, and the other half of the insulating cylinder 1 (FIG. 6)
Cover from the left half) to the outer periphery of the cable. This allows
The first waterproof protective layer 42 and the second waterproof protective layer 43 partially overlap and cover the insulating cylinder 1. In this assembling method, the procedure of assembling the connecting portion up to FIG.
This is the same as that shown in FIG.

(Embodiment 2) Next, a method of assembling a cable connecting portion using a connecting member in which a waterproof protective layer is fitted in a double core will be described. Also in this assembling method, the configuration of the insulating cylinder and the point of forming the connection portion by attaching male and female metal fittings to the cable end and inserting from both sides of the insulating cylinder are the same as in the first embodiment. .

FIG. 7A is a partial sectional view of the waterproof protective layer 35,
FIG. 7B is an end view thereof. This is a normal-temperature self-shrinkable tube. A small-diameter portion 35A covered on the power cable substantially in half in the longitudinal direction and a large-diameter portion 35B covered on the insulating cylinder in the other half. The opening side of the small diameter portion 35A is formed in a tapered shape, and the boundary between the small diameter portion and the large diameter portion 35B is also formed in a tapered shape. The inner diameter of the small diameter portion 35A is smaller than the outer diameter of the cable, and the inner diameter of the large diameter portion 35B is smaller than the outer diameter of the insulating cylinder.

Next, the inner (outer) core 51 (52) into which the waterproof protective layer 35 is fitted will be described with reference to FIG. FIG.
(A) is a side view of the inner (outer) core 51 (52) used in the method of forming the power cable connecting portion of the present invention, and (B) is an end view thereof. The inner (outer) core 51 (52) is a cylinder made of soft polyethylene having a thickness of 2 mm, the length is slightly longer than half of the waterproof protective layer 35, and the inner diameter is substantially equal to the large diameter portion to be covered which will be described later. It is. The outer diameter of the inner core 51 is about 42 mm, and the inner diameter of the outer core 52 is about 55 mm.

Two pairs of grooves are provided on the outer periphery of the inner (outer) core 51 (52).
53 are formed. This groove 53 is the inner (outer) core 51 (52)
The inner (outer) core 51 (52) is removed from the state inserted in the cable by breaking the inner (outer) core 51 (52) along the groove 53 with a parallel groove extending from one end to the other end of the cable. .

In this embodiment, two pairs of grooves 53 are provided, but usually only one pair is sufficient. Of the two pairs of grooves 53, an arc-shaped cross-sectional portion sandwiched between the pair of grooves is broken after forming the connection portion to form a broken piece 51A (52A), and the remaining portion 51B (52B) of the C-shaped cross section.
Separated from Then, as a result of removing the broken pieces 51A (52A), a cutout corresponding to the size of the broken pieces 51A (52A) is formed in the remaining portion 51B (52B). Outside) Remove the core 51 (52) from the cable.

The arrangement of each groove 53 is not particularly limited.
What is necessary is just to form from one end of the inner (outer) core 51 (52) to the other end. That is, not only parallel grooves but also non-parallel grooves may be used. For non-parallel grooves, the inner (outer) core 51
In (52), there may be mentioned a tapered groove having a narrow groove interval at one end and a wide groove interval at the other end, or a corrugated groove. By using non-parallel grooves, it is possible to prevent the groove portions from being broken due to the tightening force of the waterproof protection layer 35 and the like when not necessary.

The strength of the portion where each groove 53 is formed is such that the groove forming portion of the inner (outer) core 51 (52) is not easily broken by the tightening force of the waterproof protective layer 35, and the operator has to use pliers or the like. When pulled, it should be easy to break. If both ends of the groove are formed as cuts reaching the inner periphery of the inner (outer) core 51 (52), the work of removing broken fragments can be further facilitated. In addition, grooves
The cross-sectional shape of 53 is not particularly limited, and may be appropriately selected such as a U-shape or a V-shape. In this example, the V-groove was 1.5 mm deep. In addition, the groove 53 may be formed in a perforated shape partially communicating with the inner periphery.

The waterproof protection layer 35 and the inner and outer cores 51 (5
2) is used in combination as shown in FIG. That is, approximately half (small diameter portion: one end side) of the waterproof protection layer 35 is fitted around the outer periphery of the inner core 51. Next, the outer core 52 is fitted around the outer periphery of the inner core 51. Then, the other half (the large-diameter portion: the other end side) of the waterproof protection layer 35 is folded and fitted on the outer periphery of the outer core 52.

Here, the inner diameter of the inner core 51 is preferably equal to or slightly smaller than the outer diameter of the large diameter portion to be covered, that is, the maximum outer diameter of the insulating tape winding layer 30 in FIG. The large-diameter portion to be covered refers to a portion having the largest diameter in the covering target immediately before the waterproof protective layer 35 is covered. In addition, the waterproof protective layer 35
It is preferable that a turn 54 (FIG. 7) where the outer diameter of the inner core 51 becomes small is a turning position, and this turning position substantially corresponds to the end of the inner core 51. By defining the size of the inner core 51 and the positional relationship between the inner core 51 and the waterproof protective layer 35 in this manner,
As will be described later, a change in the diameter of the waterproof protective layer can be made to correspond to a change in the diameter of the insulating cylinder.

A method of assembling the cable connecting portion of the present invention using such a connecting member will be described. First, the inner core 51 of the connection member is fitted on the outer periphery of each of the cable ends 2A and 2B shown in FIG. 1 and is released to the cable root side. When fitting the connection member from the end of the cable, the folded position of the waterproof protective layer 35 is directed to the male or female fitting side.

Next, as shown in FIGS. 2 and 3, the cable ends 2A and 2B are inserted into the insulating cylinder, and the male fitting 20 and the female fitting 21 are inserted.
The two are connected to each other, and the insulating tape is wound in a tapered shape to form an insulating tape winding layer 30. Insulation cylinder configuration, male and female fittings 20,
The connection of 21 and the winding of the insulating tape are the same as in the first embodiment.

After that, the connecting member which has been released to the cable root side is pulled back to one end side of the insulating tube 1. At this time, the inner core 51 is stopped at a position where the inner core 51 is in contact with the large-diameter portion to be covered.

Here, the outer core 52 is moved to the other end of the insulating cylinder (FIG. 10). Even when the outer core 52 is moved, the inner core 51 does not move because it is held at a position in contact with the large-diameter portion to be covered. With the movement of the outer core 52, the folded back of the waterproof protection layer 35, which has been put on the outer core 52, is returned to the original state, and a part of the waterproof protection layer 35 is covered on the insulating cylinder 1. That is, in this state, almost half of the axial length of the insulating cylinder 1 is covered with the waterproof protective layer 35. The outer core 52 that has been moved is released while being fitted to the outer periphery of the cable on the other side of the insulating cylinder.

Next, the inner core 51 is pulled out to the cable root side (one end side of the insulating tube). By this pulling out, the other half of the waterproof protection layer 35 is put on the end of the insulating tube and the portion of the cable 2B close to the insulating tube 1.

Then, the inner (outer) core 51 (52) penetrating the cable is removed. At that time, the fragment 51A (52A) sandwiched between the pair of grooves 53 is sandwiched with pliers, and the inner (outer) core
If the core 51 (52) is pulled along the axial direction of 51 (52), the inner (outer) core 51 (52) is broken along the groove 53, and the broken pieces 51A (52A) are removed. Therefore, the inner (outer) core 51 (52) can be removed by passing the cable through the notch formed at the location where the broken piece 51A (52A) was located.

At this stage, since only one end of the insulating cylinder is covered with the waterproof protective layer, the other end is covered with the waterproof protective layer 35 in the same manner. Then, as in FIG.
The two waterproof protective layers 35 are overlapped in the middle part of, and the covering of the waterproof protective layer 35 is completed.

According to this assembling method, the inner and outer cores 51
Waterproof protective layer with simple operation of moving in the axial direction of (52)
35 coatings can be made. Instead of using the outer core 52, a connection member in which approximately half (the first half) of the waterproof protection layer 35 is fitted around the inner core 51, the remaining half (the second half) is folded, and the second half is overlapped on the first half. Can be However, in this connection member, in order to return the folded rear half portion to the original state, it is necessary to forcefully return the folded rear half portion, and the workability is extremely poor. In that respect, the outer core
The 52 can be moved very easily, and the folded part can be returned.

In this embodiment, since the waterproof protective layer 35 is only about half the length of the insulating cylinder 1 and each of them is folded, the connecting member is temporarily released to the base of the cable. However, it requires very little space.

[0047]

As described above, according to the assembling method of the present invention, since the cable ends are inserted from both sides of the insulating tube, there is no need to release the insulating tube to one side of the cable. Also, the waterproof protective layer is very short in the axial direction because it is held up in a state of being rolled up or wound up on the outer peripheral side or folded back, even if this is released to one side of the cable, The necessary distance can be shortened as much as possible. Therefore, the cable connection portion can be easily formed even in a narrow work space.

Further, the cable connecting member of the present invention can be optimally used for the above assembling method.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an assembling method of the present invention showing a state before a cable end is inserted into an insulating tube.

FIG. 2 is an explanatory view of the assembling method of the present invention showing a state after a cable end is inserted into an insulating tube.

FIG. 3 is an explanatory view of the assembling method of the present invention showing a state in which a wound waterproof protective layer is located on the outer periphery of an insulating cylinder.

FIG. 4 is an explanatory view of the assembling method of the present invention showing a state in which the outer periphery of the insulating cylinder is covered with a waterproof protective layer.

FIG. 5 is an explanatory view of the assembling method of the present invention showing a state where the waterproof protective layer divided into two parts is wound around the outer circumference of the insulating cylinder.

FIG. 6 is an explanatory view of the assembling method of the present invention showing a state in which the outer periphery of the insulating cylinder is covered with a waterproof protective layer divided into two parts.

7A is a partial sectional view of a waterproof protective layer used in the assembling method of the present invention, and FIG. 7B is an end view.

FIG. 8A is a side view of the inner and outer cores used in the assembling method of the present invention, and FIG. 8B is an end view.

FIG. 9 is a cross-sectional view of the connecting member of the present invention using an inner / outer dual core.

FIG. 10 is an explanatory diagram of an assembling method of a cable connecting portion showing a state in which an outer core is moved in an axial direction.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Insulation cylinder 2A, 2B cable end 3 Inner semiconductive layer 4 Insulating layer 5 Outer semiconductive layer 6 Copper braided wire 7 Heat shrink tube
10 Conductor 11 Insulator 12 External semiconductive layer 13 Shielding layer 14 Sheath 20 Male fitting 21 Female fitting 22 Inner circumference projection 23 Outer groove 25 Semiconductive tape 30 Insulating tape winding layer 35 Waterproof protective layer 35A Small diameter section 35B Large diameter section 36 core 40 first core 41 second core 42 first waterproof protective layer 43 second waterproof protective layer 51 inner core 52 outer core 51A, 52
A Fragment 51B, 52B Remaining 53 Groove 54 Turn

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideki Kitagawa 20-2, Toda, Kitagawara, Itami-shi, Hyogo F-term (reference) in Sumiden Asahi Seiko Co., Ltd. 5G375 AA02 BA26 BB43 BB45 BB81 CA02 CA14 CB07 CB19 CB38 CB53 CB55 CD17 DB32 EA17

Claims (9)

[Claims] 1. A method of assembling a cable connecting portion formed by inserting cable ends from both ends of an insulating cylinder, wherein a male fitting is attached to one cable end, and a female fitting is attached to the other cable end. Attachment step: Inserting both cable ends into the insulating cylinder to connect the male and female metal fittings; Turning up at least one end to the outer peripheral side and positioning the waterproof protection layer on the outer circumference of the insulating cylinder A method for assembling a cable connecting portion, comprising: a step of: returning a water-resistant protective layer that has been involved to an original state, and covering a portion of the insulating tube and the cable near the insulating tube. 2. The step of positioning the waterproof protective layer on the outer periphery of the insulating cylinder includes the steps of: fitting the waterproof protective layer on the outer periphery of a core having an inner diameter larger than the outer diameter of the insulating cylinder in advance; Before inserting the end into the insulating cylinder, inserting the core from one end of the cable, temporarily releasing the core to the cable root side, and moving the core to the outer periphery of the insulating cylinder after connecting the male and female fittings. The method for assembling a cable connection part according to claim 1, further comprising: 3. The cable according to claim 1, wherein the step of positioning the waterproof protective layer on the outer periphery of the insulating tube includes the step of inserting the waterproof protective layer in a state where the waterproof protective layer is wound around the outer periphery of the insulating tube in advance. How to assemble the connection. 4. A cable connection comprising: a core having an inner diameter larger than an outer diameter of an insulating cylinder; and a waterproof protective layer fitted on an outer periphery of the core and turned up from at least one end to an outer periphery and wound up. Element. 5. A cable connecting member comprising: a waterproof protective layer that is fitted around the outer periphery of an insulating cylinder and is turned up from at least one end toward the outer periphery and rolled up. 6. A method of assembling a cable connecting portion formed by inserting cable ends from both ends of an insulating cylinder, wherein a male fitting is attached to one cable end, and a female fitting is attached to the other cable end. Mounting, connecting both male and female metal fittings by inserting both cable ends into the insulating cylinder, comprising an inner core, an outer core fitted outside the inner core, and a waterproof protective layer, A state in which one end of the waterproof protective layer is fitted to the outside of the inner core, and the other end of the folded waterproof protective layer is fitted to the outside of the outer core, and a cable connecting member is prepared, and the inner core is fitted to the outside of the cable. Positioning the connecting member at one end of the insulating cylinder with the step of: moving the outer core to the other end of the insulating cylinder to cover a part of the waterproof protection layer on the insulating cylinder; Move to one end and insulate Covering a portion of the tube and the cable adjacent to the insulating tube. 7. An inner core, an outer core fitted to the outside of the inner core, and a waterproof protection layer, one end of the waterproof protection layer is fitted to the outside of the inner core,
The other end of the folded waterproof protective layer is fitted outside the outer core. 8. The inside diameter of the inner core is equal to or slightly smaller than the outside diameter of the large-diameter portion to be covered. In the waterproof protective layer, a transition point where the outside diameter becomes small is defined as a turning position, and the turning position is defined as an end of the inner core. The cable connection member according to claim 7, wherein the cable connection member substantially corresponds to the following. 9. The cable connecting member according to claim 7, wherein a plurality of grooves extending from one end to the other end are formed in each of the inner and outer cores.