JP2021191052A - Branch part protection tool of cable and traction method of branch cable - Google Patents

Abstract

To provide a traction method of a branch cable which prevents a branch line from being caught by an edge of a hole when the branch cable having the branch line is lifted to be passed through the hole opened on a floor of a building, etc.SOLUTION: A traction method of a branch cable comprises: a branch part protection tool installation process of installing a branch part protection tool 1 of the cable to a lifting cord 39 which lifts the tip part of a trunk line 23 of a branch cable 3; a branch line accommodation process of accommodating the tip part of a branch line 25 of the branch cable in the branch part protection tool 1 of the cable; and a traction process of pulling the branch cable 3 with the lifting cord 3.SELECTED DRAWING: Figure 9

Description

The present invention relates to a cable branch protector and a method of towing a branch cable.

The branch cable is a cable in which a branch line is branched from the main line, and the connection portion (branch portion) thereof is hardened by a resin branch mold portion. When installing (installing) a branch cable in a building such as a building, a cap is installed at the upper terminal of the main line of the cable or vinyl tape is wrapped around it.

Then, a lifting jig is attached to the head of the main line of the cable to which the cap is installed, and the branch cable is lifted. Here, Patent Document 1 is listed as a document relating to the conventional technique.

Utility Model Registration No. 3225579

By the way, in the branch cable, there are cases where the branch line extends downward from the main line and cases where the branch line extends upward from the main line.

If the branch line extends upward, the tip (upper end) of the branch line will be caught on the edge of the hole or the like provided on the floor of the building when the branch cable is lifted by a winch or the like and installed in the building. There is a problem.

The above problem becomes more remarkable when the branch line extends upward longer than the head of the main line of the cable. In addition, the fact that the branch line extends longer than the head of the main line of the cable means that the value of the length dimension of the branch line extending diagonally upward from the branch portion extends upward from the branch portion. It is larger than the value of the length dimension of the trunk line.

INDUSTRIAL APPLICABILITY According to the present invention, when a branch cable having a branch line is passed through a hole or the like in the floor of a lifting building, a cable branch protector and a method for towing the branch cable to prevent the branch line from being caught on the edge of the hole. The purpose is to provide.

The cable branch protector according to the aspect of the present invention is formed in a cylindrical shape, has elasticity, and has a diameter gradually changing in the extending direction of the central axis, and is one end in the extending direction of the central axis. At the first end, the protective device main body having the smallest diameter and the first end of the protective device main body to the second end which is the other end in the extending direction of the central axis. It has a notch portion that extends, and a return portion formed of a plurality of elastic protrusions is provided inside the protective tool main body portion, and each of the plurality of protrusions has the protection. It protrudes from the inner surface of the tool main body toward the center of the protective tool main body.

The method for towing a branch cable according to an aspect of the present invention includes a branch protection device installation step of installing a cable branch protection device on a lifting string that lifts the tip of the trunk line of the branch cable, and the branch protection device. After installing the branch protector of the cable in the installation step, the branch line accommodating step of accommodating the tip of the branch line of the branch cable in the branch protector of the cable and the branch in the branch line accommodating step. It has a towing step of towing the branch cable with the lifting string after accommodating the tip of the wire.

Further, in the method of towing a branch cable according to an aspect of the present invention, the branch protector of the cable is formed in a cylindrical shape, has elasticity, and has a diameter gradually changing in the extending direction of the central axis, so that the central axis is extended. A protective device main body having the smallest diameter at the first end, which is one end in the direction, and the other end in the extending direction of the central axis from the first end of the protective device main body. It has a notch extending to the second end.

Further, in the method of towing a branch cable according to an aspect of the present invention, a return portion formed of a plurality of elastic protrusions is provided inside the protective tool main body, and each of the plurality of protrusions is provided. Projects from the inner surface of the protective device main body toward the center of the protective device main body.

Further, in the method of towing a branch cable according to an aspect of the present invention, a closed state maintaining portion is provided for maintaining the closed state when the cut portion is closed.

Further, in the branch cable towing method according to the aspect of the present invention, the closed state maintaining portion is configured to include a first locking portion and a second locking portion, and the first locking portion is provided. The portion is formed by forming the end surface of the first portion, which is one portion of the protective device main body portion between the notch portions, into a predetermined shape, and the second locking portion is formed by forming the notch. The end surface of the second portion, which is the other portion of the protective device main body portion between the portions, is formed by forming a predetermined shape so as to be hooked on the end surface of the first portion, and the notch portion is closed. Occasionally, the end face of the first locking portion and the end face of the second locking portion come into surface contact with each other, so that the second locking portion is caught by the first locking portion. The second locking portion is configured so as not to separate from the first locking portion in the circumferential direction of the protective tool main body.

Further, in the method of towing a branch cable according to an aspect of the present invention, the closed state maintaining portion is configured to include a first locking portion and a second locking portion, and the first locking portion is provided. A plurality of through holes are provided at the end of a first portion, which is one portion of the protective device main body portion with the notch portion in between, at a predetermined interval in the extending direction of the notch portion. The second locking portion is formed at the end of the second portion, which is the other portion of the protective device main body portion with the notch portion in between, and is predetermined in the extending direction of the notch. It is composed of a plurality of protrusions provided at intervals, and when the notch is closed, the protrusions of the second locking portion are inserted into each of the through holes of the first locking portion. By fitting each of them, the second locking portion is configured so as not to be separated from the first locking portion in the circumferential direction of the protective tool main body portion.

Further, in the method of towing a branch cable according to an aspect of the present invention, the diameter of the protective tool main body is from the first end in the extending direction of the central axis to the second end in the extending direction of the central axis. The ratio of the diameter of the protective device main body increasing gradually decreases toward the distance from the first end to the second end in the extending direction of the central axis. ..

According to the present invention, when a branch cable having a branch line is passed through a hole or the like in the floor of a lifting building, it is possible to prevent the branch line from being caught on the edge of the hole.

It is a figure which shows the schematic structure of the branch part protector of the cable which concerns on embodiment of this invention, (a) shows the state which the notch part is closed, (b) is the state which the notch part is open. Is shown. It is a figure which shows the branch part protection device of the cable which concerns on embodiment of this invention which provided the return part. It is a figure which shows the shape of the cut part (closed state maintenance part) of the branch part protector of the cable which concerns on embodiment of this invention. (A) is a diagram showing a cross section of IIIA-IIIA in FIG. 1 (a), and shows a state in which the notch is closed. (B) is a diagram showing a cross section of IIIB-IIIB in FIG. 1 (b), and shows a state in which the notch is open. (C) is a diagram corresponding to (a) and is a diagram showing a modified example of the notch portion. It is a figure corresponding to FIG. 1 (a), and is the figure which shows the schematic structure of the branch part protection tool of a bull which concerns on a modification. It is a figure which shows the shape of the notch part of the branch part protector of the cable shown in FIG. (A) is a diagram corresponding to FIG. 3 (a) and shows a state in which the notch is closed, and (b) is a diagram corresponding to FIG. 3 (b) and the notch is open. It shows the state. It is explanatory drawing about the insertion of the branch line into the branch part protector of the cable which concerns on embodiment of this invention. (A) shows the state before the branch line is inserted, (b) shows the state in the middle of inserting the branch line, and (c) shows the state where the branch line has been inserted. ing. (A) is a diagram showing a VIIA-VIIA cross section in FIG. 6 (a), and (b) is a diagram showing a VIIB-VIIB cross section in FIG. 6 (a). (C) is a diagram corresponding to (a) and shows a branch portion protector of the cable according to the modified example, and (d) is a diagram corresponding to FIG. 6 (a) and relates to the modified example. It is a figure which shows the branch part protection device of a cable. It is a figure which shows the protective equipment main body part of the branch part protective equipment of the cable which concerns on a modification. It is a figure which shows the lifting of the branch cable using the branch part protector of the cable used in the towing method of the branch cable which concerns on embodiment of this invention. It is a figure which shows the lifting of the branch cable using the branch part protector of the cable which concerns on embodiment of this invention. It is a figure which shows the lifting of the branch cable using the branch part protector of the cable which concerns on embodiment of this invention. It is a figure which shows the lifting of the branch cable which concerns on a comparative example, when the branch protection tool of the cable which concerns on embodiment of this invention is not used.

As shown in FIG. 11, the cable branch protector 1 according to the embodiment of the present invention is used when the branch cable 3 is installed (installed) in a building 5 such as a building. Further, as shown in FIG. 1 and the like, the branch portion protector 1 of the cable is configured to include a protector main body portion 7 and a notch portion (notch) 9. The cable branch protector 1 may be referred to as a branch cable branch protector or a branch cable branch protector.

The protective tool main body 7 is formed in a cylindrical shape and has elasticity. By having elasticity, the protective tool main body 7 is particularly liable to change the dimensions of the outer diameter and the inner diameter of the cylinder. For example, the extension direction of the central axis of the tubular protective device main body 7 is the vertical direction.

The size of the diameter (outer diameter and inner diameter) of the protective tool main body 7 gradually changes in the extending direction of the central axis of the cylinder. In the protective tool main body 7, the diameter dimension is minimized at the first end (for example, the upper end), which is one end in the extending direction of the central axis of the cylinder. Further, although the change (increase) in diameter has already started from the upper end of the protective tool main body 7, the increase may start from a portion slightly lower than the upper end.

Further, the tubular protective tool main body 7 is formed, for example, in the shape of a rotating body. Therefore, as a matter of course, when the protective tool main body 7 is viewed in the extending direction of the central axis of the cylinder, it is formed in a circular shape.

The value of the wall thickness of the cylinder of the protective device main body 7 is almost constant. Since the protective equipment main body 7 is formed in a cylindrical shape, an opening (upper end opening) 11 is formed at the upper end of the protective equipment main body 7, and an opening is formed at the lower end of the protective equipment main body 7. (Lower end opening) 13 is formed.

Further, the fact that the diameter dimension is gradually changing means that the diameter dimension of the protective tool main body 7 is continuously and smoothly changing. That is, in the protective tool main body 7, the diameter dimension does not change abruptly in the extending direction of the central axis of the cylinder. Further explanation will be given. Consider a function in which the position of the central axis of the protective device main body 7 in the extending direction is defined as a domain and the dimension of the diameter of the protective device main body 7 is defined as a domain. In this function, when the value of the diameter dimension of the protective equipment main body 7 is differentiated by the value of the position (intermediate position) in the stretching direction of the central axis, the left and right differential coefficients match.

In the region of the protective tool main body 7 where the diameter dimension increases from the upper end to the lower end, the diameter dimension of the protective tool main body 7 always gradually and smoothly changes. On the other hand, when there is a region in the protective equipment main body 7 whose diameter dimension decreases from the upper end to the lower end, in the region where the diameter dimension decreases, the protective equipment main body decreases from the upper end to the lower end. The size of the diameter of the portion may change suddenly or gradually.

In the embodiment shown in FIG. 1, the diameter of the protective equipment main body 7 is constantly increasing from the upper end to the lower end, and the diameter of the protective equipment main body is gradually changed.

Further, as will be described in detail with reference to FIG. 8, in at least the upper portion (the portion including the upper end) of the protective tool main body 7, the diameter of the protective device main body 7 gradually increases from the upper end to the lower end. It may be in an increasing form.

The notch 9 penetrates the meat portion of the protective tool main body 7 in the thickness direction of the cylinder of the protective tool main body 7. Further, the notch 9 is continuous from the first end (for example, the upper end) of the protective tool main body 7 to the second end (for example, the lower end) which is the other end in the extending direction of the central axis of the protective device main body 7. And is extending.

That is, the notch portion 9 extends from the upper end opening portion 11 to the lower end opening portion 13 along a predetermined bus line of the protective tool main body portion 7, for example, in a straight line in a side view. In other words, the notch 9 extends from the upper end opening 11 to the lower end opening 13 so that the value of this length is minimized. Since the protective tool main body 7 has elasticity and the notch 9 is formed, the diameter of the protective tool main body 7 can be easily changed by an external force.

When no external force other than gravity is applied to the protective device main body 7 (cable branch protective device 1), the value of the width dimension of the slit-shaped notch 9 is as shown in FIG. 1 (a). For example, it is "0".

That is, the end surface 17 of one part (first part) 15 of the protective tool main body 7 sandwiched between the notches 9 and the other part (second part) of the protective tool main body 7 sandwiched between the cuts 9. The value of the distance between the part) 19 and the end face 21 is "0". Further explaining, the end surface 17 of the first portion 15 of the protective tool main body 7 sandwiching the notch 9 and the end surface 21 of the second portion 19 of the protective tool main body 7 sandwiching the notch 9 are formed. The notch 9 is closed because they are in contact with each other.

Further, when a force is applied to the protective tool main body 7 to increase the diameter of the protective tool main body 7, the protective tool main body 7 is elastically deformed and the cut portion 9 is formed as shown in FIG. 1 (b). It is designed to open. That is, the end face 17 of the first portion 15 of the protective tool main body 7 sandwiched between the notches 9 and the end face 21 of the second portion 19 of the protective tool main body 7 sandwiched between the cuts 9 are mutual. It is designed to leave.

By the way, the urging force may be applied in a state where no external force other than gravity is applied to the protective tool main body 7 and the above-mentioned distance value is “0”. That is, as shown in FIG. 1A, the second part of the protective tool main body 7 having the notch 9 sandwiched between the end surface 17 of the first portion 15 of the protective tool main body 7 sandwiched between the cuts 9 and the end surface 17 of the first portion 15. The end face 21 of the portion 19 may be in contact with each other with pressure.

Further, in a state where no external force other than gravity is applied to the protective tool main body 7, protection is provided between the end surface 17 and the notch 9 of the first portion 15 of the protective device main body 7 with the notch 9 in between. The end face 21 of the second portion 19 of the tool main body 7 may be slightly separated from the end surface 21. In this case, it is desirable that the wire main body 41 of 39 of the wire, which will be described later, cannot pass through the gap between the end face 17 and the end face 21. For example, it is desirable that the value of the dimension of the gap between the end face 17 and the end face 21 is smaller than the value of the diameter of the wire main body 41.

Here, the branch cable 3 to be protected by the cable branch protector 1 will be described. As shown in FIG. 9 and the like, the branch cable 3 includes a trunk line (main cable) 23 and a branch line (branch line; branch cable) 25. The main line 23 and the branch line 25 are flexible. The longitudinal direction of the trunk line 23 is, for example, the vertical direction. The branch line 25 extends diagonally upward from the trunk 23 line by a predetermined length in the vicinity of the upper end of the trunk line 23. Further, a portion (branch portion) 27 where the branch line 25 branches from the trunk line 23 and a portion in the vicinity of the branch portion 27 are covered with a mold portion (branch mold portion) 29.

Therefore, in one branch cable 3, a pair of trunk lines 23 (one trunk line 23A extending upward and one trunk line 23B extending downward) and one branch line 25 extend from the mold portion 29. It looks like it's extended. The lower trunk line 23B extends long from the mold portion 29. The upper trunk line 23A extends from the mold portion 29 by a predetermined length. The branch line 25 also extends from the mold portion 29 by a predetermined length.

The value of the extension length of the branch line 25 extending upward from the mold portion 29 is larger than the value of the extension length of one trunk line 23A extending upward from the mold portion 29. The cross section of the trunk line 23 having a plane orthogonal to the longitudinal direction is formed into a predetermined shape such as a circular shape. The cross section of the branch line 25 formed by a plane orthogonal to the longitudinal direction is also formed into a predetermined shape such as a circular shape.

The branch cable 3 is lifted by the lifting jig 31. As shown in Japanese Patent Application Laid-Open No. 2019-9831, the lifting jig 31 includes, for example, a lifting jig main body (net) 33 and a binding connector 35.

In the lifting of the branch cable 3 by the lifting jig 31, the lifting jig 31 is installed at the upper end of the trunk line 23A on the upper side of the branch cable 3, as shown in FIGS. 9 and 10. In this state, the upper end portion of the trunk line 23A on the upper side of the branch cable 3 is inserted into the lifting jig main body 33, and the trunk line 23A of the branch cable 3 is held by the lifting jig main body 33. Further, the binding connector 35 is located at the upper end of the lifting jig main body 33. An annular portion 37 is formed at the upper end of the binding connector 35.

The branch cable 3 is lifted by the lifting jig 31 by using a lifting string (for example, a wire) 39 extending in the vertical direction. The wire 39 includes a wire main body 41 that extends long in the vertical direction and a hook 43 provided at the lower end of the wire main body 41. Then, the hook 43 of the wire 39 is hooked on the annular portion 37 of the binding connector 35 of the lifting jig 31, and the wire main body 41 is wound up by a winch or the like (not shown) so that the branch cable 3 is lifted and moved upward. It has become.

As described above, at the upper end of the tubular protective tool main body 7, the value of the inner diameter of the protective device main body 7 and the value of the outer diameter are minimized. As a result, the value of the inner diameter of the upper end opening 11 of the protective tool main body 7 becomes smaller than the value of the inner diameter of other parts (including the lower end opening 13) of the protective device main body 7. There is. Further, the value of the inner diameter of the upper end opening 11 is equal to, slightly larger than, or slightly smaller than the value of the outer diameter of the wire main body 41 of the wire 39.

For example, the value of the inner diameter of the upper end opening 11 of the tubular protective device main body 7 when no external force other than gravity is applied to the protective device main body 7 is the value of the inner diameter of the wire main body 41 of the wire 39. It is slightly smaller than the value of the outer diameter dimension. When the cable branch protector 1 is installed on the wire 39 (wire body 41), the central axis of the protector body 7 and the center axis of the wire body 41 are substantially aligned with each other (Fig.). 11). Further, in a state where the cable branch protector 1 is installed in the wire main body 41, the wire main body 41 extends in the vertical direction, and the upper end opening 11 also passes through substantially the center and the lower end opening 13 substantially in the center. It penetrates the protective equipment body 7.

Further, in a state where the cable branch protector 1 is installed in the wire main body 41, the diameter of the upper end opening 11 is slightly increased by the wire main body 41. The upper end opening 11 of the protective tool main body 7 sandwiches the wire main body 41 with urging force, and the cable branch protective tool 1 is integrally installed in the wire main body 41. As already understood, the upper end opening 11 of the protective tool main body 7 can be said to be a hole for passing the wire main body 41.

As shown in FIGS. 2, 6, and 7, a return portion 47 formed of a plurality of elastic protrusions 45 is provided inside the protective tool main body portion 7. Each of the plurality of protrusions 45 projects from the inner surface (inner wall) of the protective tool main body 7 toward the center of the protective device main body 7.

The return portion 47 is integrally molded with, for example, the protective tool main body portion 7. The protective tool main body 7 and the barb 47 are made of fluororesin or the like, which is strong and has a low coefficient of friction. Further, the return portion 47 is provided to prevent the branch line 25 from coming out of the branch portion protector 1 of the cable. That is, the branch line 25 is housed in the branch protector 1 of the cable while the branch cable 3 is lifted by the lifting jig 31 and the branch protector 1 of the cable is installed on the wire 39. It has become. At this time, by hooking the return portion 47 on the accommodated branch line 25 (see FIG. 6C), the cable of the branch line 25 is prevented from coming off from the branch protector 1.

Here, the return portion 47 will be described in more detail. In this description, unless otherwise specified, it is assumed that no external force other than gravity is applied to the branch portion protector 1 and the return portion 47 of the cable. Each of the plurality of protrusions 45 is, for example, separated from each other and protrudes from a plurality of positions on the inner surface of the protective equipment main body 7. That is, when viewed in the extending direction of the central axis of the protective tool main body 7, each of the plurality of protrusions 45 divides the inner circumference of the protective device main body 7 substantially in the same manner as shown in FIGS. 7 (a) and 7 (b). It protrudes from the place where it is used. Further, when viewed in a direction orthogonal to the extending direction of the central axis of the protective tool main body 7 (when viewed from the side), as shown in FIG. 6, each of the plurality of protrusions 45 is the center of the protective device main body 7. They are lined up at predetermined intervals in the stretching direction of the shaft.

The protrusion 45 constituting the return portion 47 is formed in the shape of a cantilever, for example. Further, the protrusion 45 is formed in a plate shape having a predetermined width, a predetermined thickness, and a predetermined length. The width direction of the protrusion 45 coincides with the circumferential direction of the inner circumference of the protective tool main body 7, and the thickness direction of the protrusion 45 coincides with the extending direction of the central axis of the protective tool main body 7. The length direction of 45 coincides with the radial direction of the protective tool main body 7.

The value of the width dimension of the protrusion 45 is smaller than the value of the length dimension of the protrusion 45, and the value of the thickness dimension of the protrusion 45 is smaller than the value of the width dimension of the protrusion 45. As a result, the cantilever-shaped protrusion 45 is elastically deformed mainly in the vertical direction.

Further, the protrusion 45 has the appearance of a curved beam that is bent upward. Further, the protrusion 45 extends substantially horizontally on the base end side (inner wall side of the protective device main body 7), or is slightly inclined upward and extends diagonally. Further, the protrusion 45 is inclined upward and extends diagonally on the tip side (center side of the protective device main body 7). The degree of inclination of the protrusion 45 gradually increases from the inner wall of the protective equipment main body 7 toward the center, and at the tip, the degree of inclination substantially coincides with the extending direction of the central axis of the protective equipment main body 7, or The protective tool main body 7 is slightly tilted with respect to the extending direction of the central axis.

Further, as shown in FIGS. 3 (a) and 3 (b), the branch portion protector 1 of the cable is provided with a closed state maintaining portion 49. Although the display of the closed state maintaining section 49 is omitted in FIGS. 1, 2, 7, 7 (a), 7 (b), and 11 and FIGS. 9 to 11, the closed state maintaining section 49 is a notch. It is provided at 9.

The closed state maintaining portion 49 is provided to maintain this closed state when the notch portion 9 is closed. That is, the closed state maintaining portion 49 is provided to prevent the cut portion 9 from being easily opened from the state in which the cut portion 9 is closed. The time when the notch 9 is closed is when the distance between the end face 17 and the end face 21 is set to "0", and it is as if the notch 9 is not formed in the tubular protective tool main body 7. It was when they were in the same state.

Further, as shown in FIGS. 3A and 3B, the closed state maintaining portion 49 is configured to include a first locking portion 51 and a second locking portion 53. The first locking portion 51 is formed by forming the end surface 17 (end portion) of the first portion 15 of the protective tool main body portion 7 sandwiching the notch portion 9 into a predetermined shape. The second locking portion 53 also engages with the end surface (end portion) 21 of the second portion 19 of the protective tool main body portion 7 sandwiching the notch portion 9 with the end surface 17 of the first portion 15 and is hooked. It is formed by forming it into a predetermined shape.

When the notch 9 is closed, the first locking portion 51 and the second locking portion 53 engage with each other. Then, the second locking portion 53 is hooked on the first locking portion 51, and the first locking portion 51 to the second locking portion 51 are locked in a predetermined direction (for example, the circumferential direction of the protective device main body portion 7). The portion 53 is not easily separated.

Further explaining, by providing the closed state maintaining portion 49, as shown in FIG. 3A, when the cut portion 9 is closed, the end surface 17 of the first locking portion 51 and the second engaging portion are engaged. The end faces 21 of the stop 53 are in surface contact with each other. Further, when the notch 9 is closed, all the end faces 17 of the first locking portion 51 and all the end faces 21 of the second locking portion 53) come into surface contact with each other. There is. Then, the second locking portion 53 is caught by the first locking portion 51 so that the second locking portion 53 does not separate from the first locking portion 51 in the circumferential direction of the protective tool main body portion 7. It is configured.

Here, the closed state maintaining unit 49 will be described in more detail with reference to FIGS. 3 (a) and 3 (b).

When viewed in the stretching direction of the central axis of the protective tool main body 7 (stretching direction of the notch 9), the end face 17 of the first portion 15 of the protective tool main body 7 has a first line segment 55 and a second line segment. It is composed of a minute 57 and a third line segment 59. The first line segment 55, the second line segment 57, and the third line segment 59 are connected in this order, from the inner surface 61 of the protective tool main body 7 to the outer surface 63 of the protective device main body 7, the protective device main body. It extends diagonally with respect to the circumferential direction of the portion 7. Then, a triangular (“V” -shaped) convex portion 65 is formed by the second line segment 57 and the third line segment 59.

Further, when viewed in the stretching direction of the central axis of the protective tool main body 7 (stretching direction of the notch 9), the end face 21 of the second portion 19 of the protective tool main body 7 also has the first line segment 67 and the second line segment 67. It is composed of a line segment 69 and a third line segment 71. The first line segment 67, the second line segment 69, and the third line segment 71 are connected in this order, from the outer surface 63 of the protective tool main body 7 to the inner surface 61 of the protective device main body 7, the protective device main body. It extends diagonally with respect to the circumferential direction of the portion 7. Then, a triangular (“V” -shaped) convex portion 73 is formed by the second line segment 69 and the third line segment 71.

When the notch 9 is open, it is as shown in FIG. 3 (b), but when the notch 9 is closed, it is as shown in FIG. 3 (a). In the state shown in FIG. 3A, the first line segment 55 of the end surface 17 of the first portion 15 of the protective equipment main body 7 and the third end surface 21 of the second portion 19 of the protective equipment main body 7. The line segment 71 of the above is in surface contact with each other. Further, in the state shown in FIG. 3A, the second line segment 57 of the end surface 17 of the first portion 15 of the protective equipment main body 7 and the end surface 21 of the second portion 19 of the protective equipment main body 7 The second line segment 69 is in surface contact with each other. Further, in the state shown in FIG. 3A, the third line segment 59 of the end surface 17 of the first portion 15 of the protective equipment main body 7 and the end surface 21 of the second portion 19 of the protective equipment main body 7 The first line segment 67 is in surface contact with each other.

Further, in the state shown in FIG. 3A, the convex portion 65 and the convex portion 73 prevent the notch portion 9 of the protective tool main body portion 7 from opening. That is, even if the second portion 19 of the protective equipment main body 7 tries to move to the right with respect to the first portion 15 of the protective equipment main body 7 in the state shown in FIG. 3A, the convex portion 65 has a convex portion. Since 73 is caught, the above movement cannot be performed.

In the state shown in FIG. 3A, a force in the direction indicated by the arrow A3a exists in the second portion 19 of the protective equipment main body 7 with respect to the first portion 15 of the protective equipment main body 7. It may be configured to be present. That is, the protective tool main body 7 may have an internal stress such that a force in the direction indicated by the arrow A3a exists. The force in the direction indicated by the arrow A3a is the force in the circumferential direction of the protective equipment main body portion 7, and is the force in the direction in which the second portion 19 separates from the first portion 15.

Further, in the state shown in FIG. 3A, a force in the direction indicated by the arrow A3b may be present in the second portion 19 in place of or in addition to the force in the direction indicated by the arrow A3a. The force in the direction indicated by the arrow A3b is the radial force of the protective tool main body 7, and is the force in the direction of the second portion 19 toward the outer surface 63 side of the protective tool main body 7.

Further, the end surface 17 of the first portion 15 of the protective tool main body portion 7 and the end surface 21 of the second portion 19 of the protective tool main body portion 7 may be shown in FIG. 3 (c). In the configuration shown in FIG. 3C, a “V” -shaped recess 75 is provided in the central portion (central portion in the radial direction) of the end surface 17 of the first portion 15. Further, in the configuration shown in FIG. 3C, a “V” -shaped convex portion 76 is provided at the central portion (central portion in the radial direction) of the end surface 21 of the second portion 19. Then, in the state shown in FIG. 3C, the "V" -shaped convex portion 76 is fitted into the "V" -shaped concave portion 75, and the notch portion 9 is closed. In the state shown in FIG. 3C, a force in the direction indicated by the arrow A3c exists in the second portion 19 of the protective equipment main body 7 with respect to the first portion 15 of the protective equipment main body 7. It may be configured to be present.

As described above, the diameter of the protective tool main body 7 increases from the first end (for example, the upper end) in the extending direction of the central axis toward the second end (for example, the lower end) in the extending direction of the central axis. It is getting bigger and bigger.

Further, the rate at which the diameter of the protective tool main body 7 increases gradually decreases from the first end to the second end in the extending direction of the central axis.

Further explaining, assuming that the upper end opening 11 having a small diameter is not formed, the outer peripheral surface of the protective tool main body 7 has a shape obtained by halving the outer peripheral surface of a spheroidal rugby ball or an approximation thereof. It is formed in a shape. That is, the outer peripheral surface of the rugby ball is divided into two by a plane orthogonal to the extending direction of the long axis of the rugby ball and passing through the center of the rugby ball. The outer peripheral surface of the protective tool main body 7 is formed in substantially the same shape as one of the two curved surfaces obtained by this division.

The inner peripheral surface of the protective tool main body 7 is formed in a shape slightly smaller than the outer peripheral surface of the protective tool main body 7 by the thickness of the protective tool main body 7. As a result, as shown in FIG. 1, the cable branch protector 1 (protector body 7) is formed in the shape of a bell with a hollow inside.

Here, a modified example of the return portion 47 will be described with reference to FIGS. 7 (c) and 7 (d).

The return portion 47 shown in FIG. 7 (c) has a different form of the protrusion 45. The protrusion 45 shown in FIG. 7 (c) has a large width dimension value on the base end side (inner surface side of the protective tool main body 7) and on the tip side (central axis side of the protective tool main body 7). , The value of the width dimension is getting smaller. As a result, the value of the moment of inertia of area with respect to the bending of the protrusion 45 becomes larger at the base end and gradually becomes smaller toward the tip. The value of the moment of inertia of area may be changed by changing the width dimension of the protrusion 45 or by changing the thickness dimension of the protrusion 45.

The protrusion 45 of the return portion 47 shown in FIG. 6 is aligned in the extending direction and the circumferential direction of the central axis of the protective tool main body portion 7. That is, the positions of the plurality of protrusions 45A on the lowermost side of FIG. 6 coincide with each other in the extension direction of the central axis of the protective tool main body 7, and in the circumferential direction of the protective tool main body 7, It is arranged at a position where the circumference of the circle of the protective equipment main body 7 is distributed. The plurality of protrusion groups 45B in the middle of FIG. 6 are also arranged above the plurality of protrusion groups 45A in the same manner as the plurality of protrusion groups 45A. The plurality of protrusion groups 45C on the uppermost side of FIG. 6 are also arranged on the upper side of the plurality of protrusion groups 45B in the same manner as the plurality of protrusion groups 45A.

On the other hand, the protrusions 45 shown in FIG. 7C are arranged evenly in the protective equipment main body 7, for example, at random.

Further, the shape of the protective tool main body 7 may be changed as shown in FIG. The protective tool main body 7 shown in FIG. 8A is formed in a cylindrical shape with a truncated cone side surface shape. In the protective device main body 7 shown in FIG. 8B, the upper portion is formed in a hemispherical shell shape and the lower portion is formed in a cylindrical shape. In the protective tool main body 7 shown in FIG. 8 (c), the upper portion is formed in a cylindrical shape with a truncated cone side surface shape, and the lower portion is formed in a cylindrical shape. The protective device main body 7 shown in FIG. 8D gradually increases in diameter toward the lower side in the upper portion, and gradually decreases in the lower portion as the diameter increases toward the lower side. ..

In the protective tool main body 7 shown in FIG. 8A, the diameter of the protective tool main body 7 gradually increases from the upper end to the lower end in all of the protective tool main body 7. In the protective equipment main body 7 shown in FIGS. 8 (b), (c) and 8 (d), at least the upper portion (the portion including the upper end) of the protective equipment main body 7 is the protective equipment main body 7 from the upper end to the lower end. The size of the diameter is gradually increasing.

Next, the installation of the branch cable 3 in the building 5 using the cable branch protector 1 and the lifting jig 31 will be described with reference to FIGS. 9 to 11 and 6. In FIGS. 9 to 11 and 6, three branch cables 3 are installed at the same time by using the branch protector 1 of one cable and the lifting jig 31, but they are installed at the same time. The number of branch cables 3 can be changed as appropriate.

As an initial state, as shown in FIG. 9, it is assumed that the lifting jig 31 is installed on the trunk line 23 of the three branch cables 3. In addition, what is indicated by reference numeral 85 in FIG. 9 and the like is a cap which is put on the upper end portion of the trunk line 23.

In the above initial state, the hook 43 of the wire 39 is installed on the annular portion 37 of the binding connector 35 of the lifting jig 31. Subsequently, the cable branch protector 1 is installed on the wire main body 41 of the wire 39. This installation is performed by opening the notch 9 of the branch portion protector 1 of the cable and passing the wire main body portion 41 of the wire 39 through the protector main body portion 7.

Subsequently, as shown in FIGS. 10 and 6, the tip end portion (upper end portion) of the branch line 25 is inserted into the hollow portion inside the protective tool main body portion 7. As a result, the longitudinal direction of the branch line 25 substantially coincides with the vertical direction.

Subsequently, by winding the wire main body 41 of the wire 39 with a winch or the like, the branch cable 3 is passed through the hole 79 opened in the floor (ceiling) 77 of the building 5 as shown in FIG.

The cable branch protector 1 is configured to include a protector main body 7 and a notch 9. The protective tool main body 7 has elasticity and is formed in a tubular shape, and the diameter gradually changes in the extending direction of the central axis, and the diameter of the protective tool main body 7 is minimized at the upper end. Further, the notch portion 9 continuously extends from the upper end to the lower end of the protective tool main body portion 7.

As a result, if the branch cable 3 is towed using the cable branch protector 1, the hole 79 or the like when the branch cable 3 having the branch line 25 is passed through the hole 79 or the like in the floor 77 of the lifting building 5. It is possible to prevent the branch line 25 from being caught on the edge of the 79.

Further explaining, when the branch cable 3 is lifted by using the lifting jig 31, the cable branch protector 1 is installed on the wire main body 41 of the wire 39, and the branch line 25 is provided in the cable branch protector 1. Accommodates the tip (upper end) of the wire. By this accommodation, the tip end portion of the branch line 25 is covered with the branch portion protector 1 of the cable. Then, the tip of the branch line 25 does not directly hit the hole 79 or the like in the floor 77 of the building 5, and the impact force is not applied to the tip of the branch line 25 and the entire branch line 25. It is possible to prevent the branch line 25 from being damaged.

Further, since the branch line 25 is not caught, the branch cable 3 can be lifted smoothly, and the branch cable 3 does not fall off from the lifting jig 31.

In the cable branch protector 1, the diameter value of the protector main body 7 gradually increases from top to bottom, so that the cable branch protector 1 meets the floor 77 of the building 5. Even if it hits the hole 79, the branch protector 1 of the cable does not get caught in the hole 79.

Further, since the notch portion 9 is provided, it becomes easy to install the cable branch portion protector 1 on the wire main body portion 41 of the wire 39. That is, by passing the wire main body 41 through the notch 9, it is possible to facilitate the installation of the cable branch protector 1 on the wire main body 41 of the wire 39.

Further, after the first installation of the branch cable 3 is completed, the branch portion protector 1 of the cable can be removed from the branch cable 3. As a result, if the cable branch protector 1 is not damaged or otherwise damaged, the cable branch protector 1 can be reused for the second and subsequent installations of the branch cable 3.

Here, a comparative example in which the branch cable 3 is installed without using the cable branch protector 1 will be described with reference to FIG. 12. In FIG. 12, the display of the lifting jig 31 and the like is omitted.

Also in the branch cable 3 shown in FIG. 12A, the branch line 25 extends upward. When the branch cable 3 shown in FIG. 12 (a) is lifted by a winch or the like (not shown) and installed in the building 5, as shown in FIG. 12 (b), the hole 79 provided in the floor 77 of the building 5 is provided. There is a risk that the tip of the branch line 25 will be caught on the edge of the branch line 25. In addition, in FIG. 12B and the like, the state where the tip of the branch line 25 is caught on the edge of the hole 79 provided in the floor 77 of the building 5 is shown, and it shows the case where it can be passed through successfully. ing.

Further, in the cable branch protector 1, a return portion 47 formed of a plurality of elastic protrusions 45 is provided inside the protector main body 7, and each of the plurality of protrusions 45 is protected. It protrudes from the inner surface of the tool main body 7 toward the center of the protective tool main body 7.

As a result, the return portion 47 is caught in the branch line 25 housed inside the protective tool main body 7, and the cable of the branch line 25 is prevented from coming off from the branch line protective tool 1.

Further explaining, since the protrusion 45 constituting the return portion 47 is warped in the insertion direction (upward direction) of the branch line 25, the branch line 25 can be easily moved upward to the inside of the protective tool main body portion 7. Can be inserted into. On the other hand, when the branch line 25 inserted inside the protective tool main body 7 is moved downward to be pulled out from the protective device main body 7, the tip of the protrusion 45 constituting the return portion 47 becomes a branch line. I get caught in 25. This prevents the branch line 25 from easily coming out of the protective device main body 7.

Further, the branch portion protector 1 of the cable is provided with a closed state maintaining portion 49 for maintaining this closed state when the cut portion 9 is closed. As a result, the cable branching protector 1 installed in the wire main body 41 of the wire 39 is less likely to come off from the wire main body 41.

Further, in the cable branching portion protector 1, when the cut portion 9 is closed, the end surface 17 of the first portion 15 and the end surface 21 of the second portion 19 come into surface contact with each other. Then, the second locking portion 53 is caught by the first locking portion 51 so that the second locking portion 53 does not separate from the first locking portion 51 in the circumferential direction of the protective tool main body portion 7. It is configured.

As a result, it is prevented that the diameter of the protective tool main body 7 becomes large when the notch 9 is closed, and the cable branch protective tool 1 installed in the wire main body 41 of the wire 39 becomes the wire main body. It is more difficult to come off from 41.

Further, in the cable branch protector 1, the ratio of the diameter of the protector main body 7 to increase gradually decreases from the upper end to the lower end. As a result, the protective equipment main body 7 has a bell shape, and the volume of the space inside the protective equipment main body 7 is large.

By the way, the closed state maintaining portion 49 may be configured as shown in FIGS. 4 and 5. The closed state maintaining portion 49 shown in FIGS. 4 and 5 includes a first locking portion 51 and a second locking portion 53.

The first locking portion 51 is provided at the end of the first portion 15, which is one portion of the protective tool main body 7 with the notch 9 in between, at a predetermined interval in the extending direction of the notch 9. It is composed of a plurality of through holes 81.

The second locking portion 53 is provided at the end of the second portion 19 which is the other portion of the protective tool main body 7 with the notch 9 in between, at a predetermined interval in the extending direction of the notch 9. It is composed of a plurality of protrusions 83.

When the notch 9 is closed, as shown in FIGS. 4 and 5A, each of the protrusions 83 of the second locking portion 53 is inserted into each of the through holes 81 of the first locking portion 51. It is designed to fit in. As a result, the second locking portion 53 is configured so as not to be separated from the first locking portion 51 in the circumferential direction of the protective tool main body portion 7.

In the state where the notch 9 is closed, there are no extra protrusions on the outer and inner surfaces of the protective tool main body 7 at the notch 9, and the surface becomes smooth. There is.

In the cable branching protector 1 provided with the closed state maintaining portion 49 shown in FIGS. 4 and 5, when the cut portion 9 is closed, a second through hole 81 of the first locking portion 51 is used. Each of the protrusions 83 of the locking portion 53 is fitted into the protrusion 83. The second locking portion 53 is configured so as not to separate from the first locking portion 51 in the circumferential direction of the protective tool main body portion 7.

As a result, it is prevented that the diameter of the protective tool main body 7 becomes large when the notch 9 is closed, and the cable branch protective tool 1 installed in the wire main body 41 of the wire 39 becomes the wire main body. It is more difficult to come off from 41.

Next, a method (construction method) for towing a branch cable for towing a trunk line and a branch cable provided with a branch line using the branch portion protector 1 of the cable described above will be described.

The method of towing the branch cable is to install the branch protector 1 on the lifting string (for example, wire) 39 that lifts the tip (upper end) of the trunk line 23 of the branch cable 3. Have.

Further, as for the method of towing the branch cable, after installing the branch portion protector 1 of the cable in the branch portion protector installation step, the tip end portion (upper end portion) of the branch line 25 of the branch cable 3 is set as the cable branch portion protector. It has a branch line accommodating step of accommodating in 1 (protective device main body 7).

Further, the towing method of the branch cable includes a towing step of towing the branch cable in which the tip portion of the branch line 25 is accommodated in the branch line accommodating step and then the branch cable 3 is pulled up by the lifting string 39.

In this towing process, a branch cable is passed through a through hole in the floor or ceiling of the building.

Although the present embodiment has been described above, the present embodiment is not limited to these, and various modifications can be made within the scope of the gist of the present embodiment.

1 Cable branch protection 7 Protective body 9 Notch 15 First part 17 End face of first part 19 Second part 21 End face of second part 45 Protrusion 47 Return part 49 Closed state maintenance part 51 First locking part 53 Second locking part 81 Through hole 83 Protrusion

Claims (8)

It is formed in a cylindrical shape, has elasticity, and gradually changes in diameter in the stretching direction of the central axis, and the diameter is minimized at the first end, which is one end in the stretching direction of the central axis. Protective equipment body and
A notch extending from the first end of the protective device main body to the second end which is the other end in the extending direction of the central axis.
A return portion formed of a plurality of elastic protrusions is provided inside the protective tool main body, and each of the plurality of protrusions is formed from the inner surface of the protective tool main body. , The cable branch protector that protrudes toward the center of the protector body. The branch protection device installation process, which installs the cable branch protection device on the lifting string that lifts the tip of the trunk line of the branch cable,
A branch line accommodating step of accommodating the tip of the branch line of the branch cable in the branch protector of the cable after installing the branch protector of the cable in the branch protector installation step.
A towing step of towing the branch cable with the lifting string after accommodating the tip of the branch line in the branch line accommodating step.
How to tow a branch cable with. The cable branch protector is
It is formed in a cylindrical shape, has elasticity, and gradually changes in diameter in the stretching direction of the central axis, and the diameter is minimized at the first end, which is one end in the stretching direction of the central axis. Protective equipment body and
A notch extending from the first end of the protective device main body to the second end which is the other end in the extending direction of the central axis.
The method for towing a branch cable according to claim 2. Inside the protective tool main body, a barb portion formed of a plurality of elastic protrusions is provided.
The method for towing a branch cable according to claim 3, wherein each of the plurality of protrusions projects from the inner surface of the protective device main body toward the center of the protective device main body. The method for towing a branch cable according to claim 3 or 4, wherein a closed state maintaining portion is provided to maintain the closed state when the cut portion is closed. The closed state maintaining portion is configured to include a first locking portion and a second locking portion.
The first locking portion is formed by forming the end face of the first portion, which is one portion of the protective tool main body portion between the cut portions, into a predetermined shape.
The second locking portion has a predetermined shape in which the end face of the second portion, which is the other portion of the protective device main body portion with the notch portion in between, is hooked on the end face of the first portion. Has been formed and
When the notch is closed, the end face of the first locking portion and the end face of the second locking portion come into surface contact with each other, so that the second locking portion is in contact with the second locking portion. The towing of the branch cable according to claim 5, wherein the locking portion is caught and the second locking portion is not separated from the first locking portion in the circumferential direction of the protective device main body portion. Method. The closed state maintaining portion is configured to include a first locking portion and a second locking portion.
The first locking portion is provided at the end of the first portion, which is one portion of the protective tool main body portion with the notch portion in between, at a predetermined interval in the extending direction of the notch portion. It is composed of multiple through holes
The second locking portion is provided at the end of the second portion, which is the other portion of the protective device main body portion with the notch portion in between, at a predetermined interval in the extending direction of the notch. It is composed of multiple protrusions.
When the notch is closed, each of the protrusions of the second locking portion is fitted into each of the through holes of the first locking portion, so that the protective tool main body is circumferentially oriented. The method for towing a branch cable according to claim 5, wherein the second locking portion is configured so as not to separate from the first locking portion. The diameter of the protective tool main body gradually increases from the first end in the extending direction of the central axis toward the second end in the extending direction of the central axis.
Any one of claims 3 to 7, wherein the ratio of the diameter of the protective tool main body to increase gradually decreases from the first end to the second end in the extending direction of the central axis. The method of towing the branch cable described in item 1.

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