JP5978328B2 - Cable fixing structure - Google Patents

Description

  The present invention relates to a cable fixing structure installed in, for example, a pipe or a seismic isolation structure.

  As the seismic isolation structure, there is known a structure in which the upper structure is supported on the foundation or the lower structure via a seismic isolation device. In this type of seismic isolation structure, the seismic isolation device is greatly and slowly deformed with respect to the lower structure that vibrates due to the earthquake motion when an earthquake occurs, and the seismic motion input to the upper structure is reduced by avoiding the shaking of the seismic motion. It is like that. For this reason, when an earthquake occurs, a large relative displacement occurs between the lower structure and the upper structure. Therefore, when various cables are pulled into the seismic isolation structure, in addition to not damaging the function as a cable due to the influence of the earthquake, it is also necessary to follow a large relative displacement.

  For example, when a cable is laid in a building or a pipeline, a fixed portion is provided at a predetermined interval to fix the cable. In consideration of the relative deformation that occurs during an earthquake or the like, the cable is provided with a certain length as described in Patent Document 1. However, when a relative deformation exceeding the surplus length occurs in the cable due to an earthquake or the like, there is a possibility that the tension acts on the cable and the function is impaired. Further, even if the relative deformation is within the range of the extra length, if the cable has a large diameter and high rigidity, an excessive load may be applied to the fixed portion, causing a problem in function.

On the other hand, as a means for protecting the cable, the fixing portion is broken before the cable is damaged by using a low strength insulation lock, string, or the like for the fixing portion. Alternatively, adjustment is made so that an excessive load does not act on the cable by lowering the fixing degree using a spring-type special fixing hardware instead of general bolt fixing.
However, even when an insulation lock, a string, or the like is used, there is a possibility that the cable may be interfered by the fixed portion being broken. In addition, the spring-type fixed hardware has a drawback in that the hardware is deformed within a certain range due to an earthquake or the like, so that the spring portion and the screw thread of the bolt are easily damaged and expensive.

  As another conventional example, when a cable is drawn from a lower structure such as a foundation to an upper structure such as a building in a seismic isolation structure, as shown in FIG. The cable 102 is disposed on the inner wall of the pipe 101 so as to be supported at a predetermined interval by a tubular fixing portion 103, for example. In consideration of the case where the connecting portions of the pipes 101 are displaced and relatively deformed in the event of an earthquake, the cable 102 is laid by providing a certain length extra portion 104 between the fixed portions 103.

Japanese Patent Laid-Open No. 11-346430 JP 2010-24772 A

However, in the conventional seismic isolation structure, when the connecting portion of the pipe 101 connected by an earthquake or the like is displaced, the extra length portion 104 of the cable 102 is also displaced as shown in FIG. As shown in FIG. 11, the cable 102 is bent steeply at one of the fixed portion 103 of the one pipe 101 and the fixed portion 103 of the other pipe 101, and the cable 102 may be damaged. was there.
In addition, as a means for preventing sudden bending of the cable supported by the fixed portion, for example, as described in Patent Document 2, a method in which a trumpet-shaped curved portion is formed at the opening corner of the hollow portion of the fixed portion is also proposed. However, forming the trumpet-shaped curved portion at the opening corner of the fixing portion for fixing the cable has a drawback that it is difficult to manufacture and the cost is high.

  The present invention has been made in view of such circumstances, and the cable does not form a special curved portion on the inner surface of the opening corner of the fixing member through which the cable is inserted, and the cable is a fixing member when an earthquake occurs. It is an object of the present invention to provide a cable fixing structure that is prevented from being bent suddenly at an opening corner of the cable.

The cable fixing structure according to the present invention is a cable fixing structure in which a cable is installed between a lower structure and an upper structure installed via a seismic isolation device, and is fixed to the lower structure and inserted through the cable. A hollow first fixing member that is fixed to the lower structure, is installed on the upper structure side of the first fixing member, and is larger in diameter than the inner diameter of the first fixing member A hollow first expanded fixing member having an inner diameter that allows the cable to pass therethrough, a hollow second fixing member that is fixed to the upper structure and allows the cable to pass therethrough, and fixed to the upper structure. The cable is inserted through the cable having an inner diameter that is installed on the first diameter-expanded fixing member side with respect to the second fixing member and is larger than the inner diameter of the second fixing member. Hollow second diameter expansion And a constant member, according to the present invention which is characterized in that a surplus length portion between the first expanded diameter fixing member and the second expanded diameter fixing member of the cable, first to hold the cable Since the cable is laid through the first and second enlarged diameter fixing members having an inner diameter larger than that of the second fixing member, even if the cable is largely displaced by an earthquake or the like, the first And the cable inserted through the second fixing member is bent or inclined through the expanded hollow inner surface of the first and second enlarged fixing members by inserting the first and second enlarged fixing members. Therefore, the cable is not bent suddenly at the opening of the outlet of the first and second fixing members or the first and second enlarged fixing members, and the cable is gently bent to prevent the cable from being damaged. it can.

In addition, a plurality of sets of cables are laid, a plurality of first and second fixing members are provided so that a plurality of sets of cables can be inserted individually, and a plurality of sets of cables are inserted through the first and second enlarged diameter fixing members. It is preferable to let it be.
Moderate sets of cables a plurality of first and second fixing member inserted individually painted large curve by inserting the interior of the first and second expanded diameter fixing member whose inner diameter is enlarged, respectively The cable can be prevented from being damaged due to bending. In addition, since the plurality of sets of cables are inserted through the insides of the first and second diameter-enlarged fixing members, damage due to sudden bending of the plurality of sets of cables can be prevented with a simple configuration.

Further, the first and second diameter expansion fixing members may be cylindrical bodies.
Since the first and second diameter-enlarged fixing members are cylindrical bodies, they are simple in shape and easy to manufacture, so that the cost is low, and the cylinders have an inner diameter that is larger than that of the first and second fixing members. Even so, the cable can be bent gently while preventing sudden bending.

Further, the first and second diameter-expanding fixing members may be ring bodies having a circular cross section or an elliptical shape.
Since the first and second diameter expansion fixing members are ring bodies having a circular cross section or an elliptical shape, the inner surface of the opening is simple even if the cable is abutted or scraped even if it is easy to manufacture and low cost. Since there is no corner, the cable can be bent more gently without damaging the cable.

The first and second diameter-enlarged fixing members may be formed in a tapered shape in which the hollow portion gradually increases in diameter toward the opening opposite to the first and second fixing members.
Since the opening of the hollow portion of the first and second diameter-expanding fixing members is formed in a taper shape, the cable can be loosened even if the cable abuts or scratches without being damaged. Can be curved.

According to the cable fixing structure of the present invention, the cable passes through the first and second diameter-enlarged fixing members having inner diameters larger than the hollow first and second fixing members through which the cable is inserted. , even as a cable is largely displaced by an earthquake or the like, a cable inserted through the first and second fixing members or bent by inserting a hollow portion which is enlarged in the first and second expanded diameter fixing member In order to incline, it does not bend suddenly at the outlet openings of the first and second diameter-expanding fixing members, and can be prevented from being damaged because it is gently bent.

It is principal part sectional drawing which shows the fixation structure of the cable in piping by 1st embodiment of this invention. It is a principal part perspective view which shows the state which the cable deform | transformed about the cable fixing structure shown in FIG. It is principal part sectional drawing which shows the fixing structure of the cable by 2nd embodiment of this invention. It is a principal part perspective view which shows the state which the cable deform | transformed about the fixing structure of the cable shown in FIG. It is principal part sectional drawing which shows the fixing structure of the cable by 3rd embodiment of this invention. It is a principal part perspective view which shows the state which the cable deform | transformed about the cable fixing structure shown in FIG. It is principal part sectional drawing which shows the fixing structure of the cable by 4th embodiment of this invention. It is a principal part perspective view which shows the state which the cable deform | transformed about the cable fixing structure shown in FIG. FIG. 9 shows a cable fixing structure according to a modification, and is an explanatory view showing a configuration in which a cable fixing structure is provided on a cable connected to a lower structure and an upper structure before and after a seismic isolation device. It is a longitudinal cross-sectional view which shows the fixing structure of the cable in the conventional piping, (a) is a figure which shows a normal cable laying state, (b) is a figure which shows the state which piping shifted | deviated by the earthquake etc. FIG. It is an expanded sectional view of the A section in FIG.10 (b).

A cable fixing structure according to each embodiment of the present invention will be described below with reference to FIGS.
1 and 2 show a structure for fixing a cable 1 according to a first embodiment of the present invention. For example, the cable 1 is laid in a pipe 2 arranged in a structure such as the ground or a building. Show. In FIG. 2, as the fixing structure of the cable 1, the pipe 2 is omitted and only the cable 1, the fixing member 3, and the diameter-expanded cylindrical member 9 are shown.
A plurality of pipes 2 are connected to each other in a structure such as the ground or a building via a connecting portion 2a. A hollow, for example, cylindrical fixing member 3 is fixed to the inner wall of the pipe 2 at a predetermined interval, and the cable 1 is inserted through the inner surface of the fixing member 3. An appropriate cable 1 can be laid, for example, a communication metal cable, a power cable, or the like is provided. The cable 1 is not limited to a single communication metal cable, power cable, or the like, and a bundle of a plurality of cables or a plurality of types of cables may be used as one set of cables 1.

  The fixing member 3 is formed of a metal hardware such as steel or aluminum. For example, as shown in FIG. 2, the fixing member 3 is a member in which the flange portions 4 a formed at both ends of two divided bodies 4 obtained by halving the cylindrical body are brought into contact with each other and fastened with screws 5. Alternatively, the cable 1 may be inserted through an integral cylindrical body that is not divided. The inner diameter dimension of the fixing member 3 is set to be slightly larger than the outer diameter dimension of the cable 1, for example. The cable 1 is formed with a surplus length portion 7 having the same bending as the surplus length portion 104 shown in FIG. 10 in the vicinity of the connecting portion 2a for connecting the pipes 2 to each other. 1 is not damaged by excessive tension.

  The cable 1 extending in front of the fixing member 3 is supported by the fixing member 3 of the pipe 2 and penetrates the enlarged diameter cylindrical member 9 provided on the connecting portion 2a side near the fixing member 3. An extra length portion 7 of the cable 1 is formed in front of the diameter tubular member 9. The enlarged diameter cylindrical member 9 has a cylindrical shape having an inner diameter larger than that of the fixing member 3, for example, and a relatively large diameter cable 1 is loosely inserted therethrough. For example, as shown in FIG. 2, the enlarged-diameter cylindrical member 9 is a member in which the flange portions 10 a at both ends of two divided bodies 10 obtained by halving the cylindrical body are brought into contact with each other and fastened with screws 5. Alternatively, the enlarged diameter cylindrical member 9 may be formed of an integral cylindrical body that is not divided, and the cable 1 may be inserted therethrough.

Therefore, a gap is formed between the cable 1 and the inner surface of the diameter-expanded tubular member 9 in the diameter-expanded tubular member 9 into which the cable 1 is inserted, and the cable 1 can be gently bent and displaced.
In the normal state shown in FIG. 1, the cable 1 is connected to the other adjacent pipe 2 (hereinafter referred to as the pipe 2 </ b> A) that is coaxially connected to the pipe 2 in the pipe 2. The diameter tubular member 9 and the fixing member 3 are attached in sequence, and the cable 1 is inserted and supported by these members. In addition, it is preferable to install the fixing member 3 and the enlarged diameter cylindrical member 9 coaxially.

The fixing structure of the cable 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next. In the fixing structure of the cable 1 by the pipe 2 in the normal state shown in FIG. 1, the cable 1 passes through the center of the enlarged diameter cylindrical member 9 and passes through the center of the enlarged diameter cylindrical member 9 and the fixing member 3 in the adjacent pipe 2 </ b> A. It is inserted and supported.
When an earthquake or the like occurs, in FIG. 1, the connecting portion 2a of the pipe 2 and the pipe 2A shifts as shown by a one-dot chain line. For example, when the adjacent pipe 2A shifts downward (or laterally) with respect to the pipe 2, Since the fixing member 3 is also displaced due to the displacement of the pipe 2A, the cable 1 is forcedly deformed. Then, the extra length portion 7 of the cable 1 located at the connecting portion 2a of the pipe 2 is shifted downward (or in the lateral direction), so that the cable 1 moves downward as indicated by a one-dot chain line in the pipe 2 with respect to the fixing member 3. Displace.

Even in this case, since the enlarged-diameter cylindrical member 9 is disposed in front of the fixing member 3 in the pipe 2, the cable 1 is slightly curved as shown in FIG. It abuts on the opening corner 9a on the outlet side, and further bending and bending are prevented. For this reason, the cable 1 is guided by a slanting or bending at the outlets of the fixing member 3 and the widening tubular member 9 at the outlet side of the fixing member 3 and the widening tubular member 9 so that the cable 1 is gently tilted or bent, and is displaced. Connected to part 7.
As a result, the cable 1 that curves and extends from the enlarged diameter tubular member 9 to the distal end side is guided in contact with the opening corner portion 9a, so that the deformation is less likely to concentrate and the concentration and deformation of the cable 1 can be prevented from being concentrated.

As described above, according to the fixing structure of the cable 1 according to the present embodiment, the cable 1 is inserted through the fixing members 3 arranged at predetermined intervals in the pipe 2 and the inside of the enlarged diameter cylindrical member 9 provided in front thereof. Since the cable 1 is inserted into the cable 1, even if the pipe 2 and the pipe 2 </ b> A holding the cable 1 are displaced due to an earthquake or the like, the cable 1 does not bend suddenly at the opening corner of the fixing member 3, and the diameter-expanded cylinder The cable 1 can be prevented from being damaged because it is guided in contact with the enlarged opening corner 9a of the diameter-shaped member 9 and is gently inclined or curved.
Moreover, since the extra length portion 7 of the cable 1 is provided in the connecting portion 2a of the pipe 2, the pipe 2A is shifted at the connecting portion 2a, and the cable 1 is largely shifted at the extra length portion 7 to forcibly deform or shift. In addition, since the cable 1 comes into contact with the opening corner 9a of the enlarged cylindrical member 9 whose diameter is larger than that of the fixing member 3 and is gently inclined or curved, damage to the cable 1 can be reliably prevented.

  The present invention is not limited to the fixing structure of the cable 1 according to the first embodiment described above, and can be appropriately changed or replaced without departing from the gist of the present invention. Included in the invention. Although other embodiments and modifications of the present invention will be described below, the same or similar parts and members as those of the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  For example, instead of the configuration in which the enlarged-diameter tubular member 9 is fixedly held on the inner surface of the pipe 2, it may be supported so as to be slidable in the longitudinal direction of the pipe 2. As the enlarged diameter cylindrical member 9 advances or retreats in a direction approaching or separating from the fixed member 3, the angle at which the cable 1 tilts or curves by contacting the opening corner 9a of the enlarged diameter cylindrical member 9 is increased or decreased. be able to. This configuration can also be adopted in other embodiments and modifications described below.

Next, the fixing structure of the cable 1 according to the second embodiment of the present invention will be described with reference to FIGS. Although the cable 1 according to the present embodiment is also supported in the pipe 2, the pipe 2 is omitted in each drawing including the following embodiments.
In the fixing structure of the cable 1 according to the second embodiment, a fixing member 3 that holds the cable 1 in the pipe 2 is provided, and further in front of the diameter-expanding cylindrical member 9 according to the first embodiment. A diameter-enlarged ring body 12 having a circular cross section or an elliptical shape is attached to the inner wall of the pipe 2. Moreover, the diameter-enlarged ring body 12 has an inner diameter that is larger than the inner diameter of the fixing member 3, so that the cable 1 is inserted into the diameter-enlarged ring body 12 with a gap.

Therefore, according to the second embodiment, the diameter-enlarged ring body 12 has a ring shape such as a circular cross section or an ellipse, and therefore when the pipe 2 or the like is displaced due to an earthquake or the like and the cable 1 is subjected to forced deformation or the like, As shown in FIG. 4, even if the cable 1 protruding from the fixing member 3 is inclined or curved and comes into contact with the diameter-expanded ring body 12, unlike the opening corner portion 9a of the diameter-expanded cylindrical member 9 described above, Since it abuts on the curved surface, the cable 1 is less likely to be damaged. In addition, there is an advantage that the cable 1 is less likely to be scratched even when the cable 1 in contact with the expanded ring body 12 is relatively displaced due to vibration such as an earthquake.
In addition, the diameter-expanded ring body 12 is not limited to a circular cross-section or an ellipse, and at least a region where the cable 1 can contact may be a curved surface.

Next, the fixing structure of the cable 1 according to the third embodiment of the present invention will be described with reference to FIGS.
In the fixing structure of the cable 1 according to the third embodiment, a fixing member 3 that holds the cable 1 in the pipe 2 is provided, and further in front of the above-described enlarged diameter cylindrical member 9 according to the first embodiment. A substantially trumpet-shaped enlarged diameter tapered body 14 is attached to the inner wall of the pipe 2.

Moreover, the diameter-expanded taper body 14 has a convex curved surface shape or an inclined surface shape in which the hollow inner surface gradually increases in inner diameter from the end portion on the fixing member 3 side toward the other end side. With the cable 1 inserted therethrough, the gap gradually increases from the end on the fixing member 3 side toward the opening on the other end side. In the present embodiment, it is preferable that the diameter of the enlarged diameter tapered body 14 is larger than the outer diameter of the cable 1 from the opening on the fixing member 3 side.
According to this embodiment, even if the pipe 2 and the pipe 2A are displaced due to an earthquake or the like, the cable 1 continuing to the surplus length portion 7 is slightly inclined along the inner surface of the diameter-expanded tapered body 14 as shown in FIG. Since it is only displaced to the curved shape, damage to the cable 1 can be prevented.

Each of the cable 1 fixing structures according to the above-described embodiments is provided with a fixing member 3 for inserting one set (bundle) of cables 1 and an enlarged cylindrical member 9 connected to the extra length portion 7 in front of the fixing member 3 and an enlarged ring. Various diameter expansion fixing members such as the body 12 and the diameter expansion taper body 14 are provided, and a set of cables 1 is inserted.
However, in the present invention, the diameter-enlarged fixing member may be configured not only to allow one set of cables 1 to be inserted, but also to allow a plurality of sets of cables 1 to be inserted. Next, the invention having such a configuration will be described below as a fourth embodiment with reference to FIGS.

In the cable 1 fixing structure according to the fourth embodiment shown in FIG. 7, a plurality of types of bundled cables 1, 1 </ b> A, 1 </ b> B each having different outer diameter dimensions (or may have the same outer diameter). Are respectively inserted into the fixing members 3 attached in the pipe 2. A single expanded cylindrical body 16 through which the plurality of sets of cables 1, 1 </ b> A, 1 </ b> B are inserted together is attached to the inner wall of the pipe 2. The cable 1 located on the distal end side of the enlarged diameter cylindrical body 16 is provided with an extra length 7 and an enlarged diameter cylindrical body 16 provided in another pipe 2A, as in the first embodiment shown in FIG. The members 3 and the like are sequentially arranged coaxially, and the cable 1 is inserted and held therein.
In addition, the diameter-expanded cylindrical body 16 has the same shape as the diameter-expanded cylindrical member 9 in the first embodiment described above and a shape in which the size including the inner diameter is further expanded.

  In the fixing structure of the cable 1 according to the fourth embodiment, the diameter-expanded cylindrical body 16 is formed into a simple cylindrical body that is expanded in diameter so that a plurality of types of cables 1A, 1B, and 1C can be collectively inserted. Therefore, as shown in FIG. 8, each cable 1 </ b> A, 1 </ b> B, 1 </ b> C is provided on the distal end side of the fixing member 3 even if the cable 1 is forcedly deformed due to the displacement of the pipe 2 </ b> A due to an earthquake or the like. It is only slightly curved or inclined in contact with the inner surface of the body 16 or another cable 1. Therefore, the diameter-expanded cylindrical body 16 can prevent the cable 1 from being damaged or scratched due to abrupt deformation of the cables 1A, 1B, 1C at the exit corners of the fixing member 3 and local load concentration.

  Further, as the diameter expansion fixing member, not only the diameter expansion cylindrical body 16 according to the fourth embodiment, but also the diameter expansion cylindrical member 9, the diameter expansion ring body 12, the diameter expansion taper body 14 according to the above-described embodiments, which will be described later. It is possible to employ appropriate expanded cylindrical or ring-shaped members such as the expanded diameter cylindrical members 23 and 24. In addition, these diameter-enlarged fixing members can adopt not only one set (bundle) of cables 1 but also a plurality of sets (bundles) of cables 1, 1A, 1B, 1C, etc. that can be inserted together.

In each of the above-described embodiments, as the cable 1 fixing structure, the cable 1 that is held by being inserted through the fixing member 3 attached in the pipe 2 is in the event of an earthquake or the like at the connecting portion 2a between the pipe 2 and the pipe 2A. When the pipe 2A is relatively displaced, the diameter-enlarged fixing member prevents deformation due to bending or bending of the cable 1 at the opening corner portion of the fixing member 3 before and after the extra length portion 7 or damage due to bending. The invention that can be performed has been described.
However, the present invention is not limited to such a configuration, and can be applied to the case where the pipe 2 is not provided. That is, when a shift due to an earthquake or the like occurs in a region between the fixing member 3 on one end side of the cables 1A, 1B, 1C, etc. and the fixing member 3 on the other end side adjacent thereto, these cables 1A, 1B, 1C For example, the cable 1A, 1B, 1C, etc. is inserted through the cable 1A, 1B, 1C, etc. by inserting the enlarged diameter fixing member on both sides or one side of the region where the deviation occurs, and the load concentrated on the opening corners of the fixing member, etc. It is possible to prevent the cable 1 from being damaged.

For example, as shown in FIG. 9, when various cables 1 are disposed between a lower structure 21 such as a base installed via a seismic isolation device 20 and an upper structure 22 such as a building, an earthquake or the like Thus, the enlarged diameter cylindrical members 23 and 24 can be respectively installed between the fixing members 3 in the lower structure 21 and the upper structure 22 where the cable 1 is forcibly deformed. The extra length portion 7 of the cable 1 is formed between the enlarged diameter cylindrical members 23 and 24.
By adopting such a configuration, the diameter-expanded cylindrical members 23 and 24 are caused by the forced deformation of the cable 1 between the seismic isolation devices 20 and the damage of the cable 1 due to the load concentrated on the opening corners of the fixing member 3 and the like. Can be prevented.
In short, the cable 1 fixing structure according to the present invention adopts a configuration in which the diameter-enlarged fixing member is inserted into the various cables 1 through which the fixing member 3 is inserted, so that the cable 1 is suddenly deformed due to vibration or displacement due to an earthquake or the like. It can be prevented from being damaged by being bent or bent.

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C Cable 2, 2A Piping 2a Connection part 3 Fixing member 9 Expanded cylindrical member 12 Expanded ring body 14 Expanded taper body 16 Expanded cylindrical body

Claims (5)

In the cable fixing structure in which the cable is installed between the lower structure and the upper structure installed via the seismic isolation device,
A hollow first fixing member fixed to the lower structure and allowing the cable to pass therethrough;
It is fixed to the lower structure and is installed on the upper structure side from the first fixing member and has an inner diameter that is larger than the inner diameter of the first fixing member and allows the cable to pass therethrough. A hollow first expanded-diameter fixing member;
A hollow second fixing member fixed to the upper structure and allowing the cable to pass therethrough;
An inner diameter that is fixed to the upper structure and is disposed on the first diameter-enlarged fixing member side with respect to the second fixing member, and has an inner diameter that is larger than the inner diameter of the second fixing member. A hollow second enlarged diameter fixing member that allows the cable to pass therethrough,
A cable fixing structure , wherein an extra length portion is provided between a first diameter-expanding fixing member and a second diameter-expanding fixing member of the cable. A plurality of the cables are laid,
A plurality of the first and second fixing members are provided to individually insert a plurality of sets of cables,
The cable fixing structure according to claim 1, wherein the first and second diameter-expanding fixing members allow a plurality of sets of cables to pass therethrough. The cable fixing structure according to claim 1, wherein the first and second diameter-expanding fixing members are cylindrical bodies. The cable fixing structure according to claim 1 or 2, wherein the first and second diameter-expanding fixing members are ring bodies having a circular or elliptical cross section. The said 1st and 2nd diameter expansion fixing member is formed in the taper shape from which a hollow part expands gradually toward the opening on the opposite side to said 1st and 2nd fixing member. Cable fixing structure.

Images