JP6238154B2 - Cable laying structure for pipeline facilities and seismic fixing fixtures used therefor - Google Patents

Description

  The present invention relates to a cable laying structure for a pipeline facility for laying a cable such as an optical fiber cable in a pipeline facility such as a sewer, and an earthquake-resistant fixture used therefor.

  In recent years, with the development of digital information communication technology represented by the Internet and digital broadcasting, development of a cable network using an optical fiber cable or the like that enables high-speed and large-capacity information communication has been promoted.

  In addition, such cable networks are being installed in the ground as disaster countermeasures such as urban landscapes, earthquakes, typhoons, and fires.

  However, enormous costs and a long construction period are required to newly embed cables in the ground, and in recent years, pipe facilities such as sewers that are connected not only to large facilities but also to households are used. A construction method for laying a cable such as an optical fiber cable in the pipeline facility has been developed (see, for example, Patent Document 1).

  On the other hand, such a pipe facility has a vertical cylindrical vertical hole structure such as a human hole in the middle of the pipe line, and when a cable is arranged so as to cross the diameter direction in the vertical hole structure. There is a risk that rainwater or the like that has flowed into the vertical hole structure will directly hit the cable, and the cable may be damaged, dropped, or vibrated by the impact.

  Therefore, in the conventional cable laying in the vertical hole structure, as shown in FIG. 10, the cable 1 is arranged along the inner wall portion of the vertical hole structure 2, and the cable 1 is saddles 3, 3,. The cable 1 is firmly fixed by using so that the cable 1 is not vibrated or dropped due to falling water or fluctuations in the sewage water level.

  The portion of the cable 1 laid in the vertical hole structure 2 is drawn from the end openings of the tube rod tubes 4 and 4 along the inner wall of the vertical hole structure 2 upward in the cylinder axis direction. The straight portions 5a and 5b, and the curved portion 6 arranged in a semicircular arc along the inner periphery of the structure inner wall 2 from the upper end of one straight portion 5a to the upper end of the other straight portion 5b. The height position of the portion 6 is set at a certain distance from the upper surface of the invert so that the curved portion 6 does not interfere with the flow of maintenance work and the influence of the sewage flow can be avoided.

  The height of the curved portion 6 is such that each straight portion 5a, 5b has a joint 2a between the housing block 7 and the intermediate block (side block) 8 of the vertical structure 2 depending on conditions such as installation of a junction box for branching. It may be set so as to straddle.

  On the other hand, as shown in FIG. 11, a fixture 3 (saddle) 3 for fixing the cable 1 to the inner wall portion of the vertical hole structure 2 is integrally formed of a metal plate material, and has a semicircular arc shaped gripping portion 10 and a gripping portion. 10, and fixed portions 11, 11 projecting outward from both ends of the cable 10, and the fixing portions 11, 11 are anchored to the inner wall of the vertical hole structure 2 by the anchor member 12 in a state where the cable 1 is fitted inside the grip portion 10. By fixing, the cable 1 is fixed to the inner wall portion of the vertical hole structure 2 so as not to move.

JP 2002-182087 A

  However, in the conventional technology as described above, when a relative displacement occurs between the pipe housing tube body and the vertical hole structure or between the vertical body block and the intermediate block due to a large-scale earthquake motion, As a result, a great tensile force or shearing force acts on the cable, so that a great load is applied to the portion of the cable that is firmly fixed by the saddle type fixing tool, and the cable sheath may be damaged.

  Therefore, in view of such conventional problems, the present invention provides a cable laying structure for a pipeline facility that can firmly fix a cable during normal times and can reduce the load acting on the cable during an earthquake, and the cable laying structure for the cable laying structure. It was made for the purpose of providing seismic fixtures.

The feature of the invention described in claim 1 for solving the conventional problems as described above is a structure for laying a cable in a pipeline facility having a vertically-oriented cylindrical upright structure in the middle of the pipeline. A portion laid in the vertical hole structure of the cable, and a straight portion drawn upward along the inner wall of the vertical hole structure from the pipe body, and an upper end of the one straight portion. A curved portion arranged in an arc shape along the inner periphery of the vertical structure over the upper end of the other straight portion, and the linear portion and the curved portion are connected to the internal wall of the vertical structure by a plurality of fixtures. In the cable laying structure of the pipeline facility to be fixed, an earthquake-resistant fixture is used for a part or all of the plurality of fixtures, and the earthquake-resistant fixture is integrally formed of a synthetic resin material having elasticity. , One end in the longitudinal direction is inside the vertical structure by an anchor type fixing member A fixed piece that is fixed to the surface, and a cable gripping part that protrudes from the other end surface of the fixed piece in the longitudinal direction, and includes a cable gripping part that grips the cable . In the cable laying structure of the pipeline facility, the cable is detached from the cable gripping portion when a certain force or more is applied to the cable .

  The feature of the invention described in claim 2 is that, in addition to the configuration of claim 1, the lower end of the straight portion is fixed to the inner wall of the vertical hole structure by the seismic fixing tool.

The feature of the invention described in claim 3 is that, in addition to the configuration of claim 1 or 2 , both sides of the portion straddling the straight portion and the curved portion are fixed by the seismic fixing tool, respectively .

According to a fourth aspect of the present invention, in addition to the configuration of the first, second, or third aspect, the linear portion is disposed between blocks that are continuous with each other and that constitute the standing hole structure. The both sides of the part straddling between the blocks are fixed by the seismic fixing tool.

  According to a fifth aspect of the present invention, in addition to the configuration of the first to third or fourth aspects, the seismic fixing fixture grips the cable in a state in which the cable is allowed to move in the cable axial direction. It is to have done.

A feature of the invention described in claim 6 is the seismic fixing tool used in the cable laying structure of the management facility according to claim 1 to 4 or 5, wherein one end is fixed to the standing hole structure by a fixing member. And a cable gripping part that is integrally projected on the other end surface of the fixed piece and through which the cable is inserted, and has a detachable opening at the projecting end of the cable gripping part , and the cable has a certain level or more. When the force is applied, the cable is in an earthquake-resistant fixture in which the cable is pushed out of the opening for detachment and separated from the cable gripping portion.

  The invention feature of claim 7 is that, in addition to the configuration of claim 6, a shearing cable protection part is provided by chamfering at both end opening edges of the cable gripping part.

  A feature of the invention described in claim 8 is that, in addition to the configuration of claim 6 or 7, a detachable cable protection portion is provided on the inner edge portion of the detachable opening by chamfering.

The cable laying structure of the pipeline facility according to the present invention, as described above, is a structure for laying a cable in a pipeline facility having a vertically-oriented cylindrical upright structure in the middle of the pipeline, A straight portion drawn upward along the inner wall of the vertical hole structure from each pipe rod body in a portion laid in the vertical hole structure of the cable, and the other straight portion from the upper end of the one straight portion A curved portion arranged in an arc shape along the inner periphery of the vertical hole structure over the upper end of the vertical hole structure, and the straight line portion and the curved portion are fixed to the inner wall of the vertical hole structure by a plurality of fixtures. In the cable laying structure of the pipeline facility, an earthquake-resistant fixture is used for a part or all of the plurality of fixtures, and the earthquake-resistant fixture has a cable gripping part for gripping the cable, and the cable More than a certain force was applied to the cable with the gripping part In the normal state, the cable of the vertical hole structure portion such as a human hole is firmly fixed to the inner wall surface of the vertical hole structure and is maintained in a slack-free state. Even if a load due to fluctuations in sewer water level or inflow of rainwater occurs, the cable can be prevented from moving and vibrating.When a great load is generated on the cable due to seismic motion, the cable is detached from the earthquake-resistant fixture, By loosening the cable, the load can be alleviated, an excessive load is not generated on the cable, and damage to the cable sheath can be prevented.

  In the present invention, the lower end of the straight portion is fixed to the inner wall of the vertical hole structure with the seismic fixing tool, so that the relative position of the vertical tube structure when the pipe body moves relative to the vertical structure in the pushing direction. The cable can be detached from the seismic fixture in conjunction with the movement.

  Further, in the present invention, when an excessive tensile force acts on the cable due to seismic motion or the like by fixing the portion straddling the straight line portion and the curved portion with the earthquake-resistant fixture, the cable is connected to the cable from the earthquake-resistant fixture. The tensile force acting on the cable can be relaxed.

  Furthermore, in this invention, the said linear part was arrange | positioned ranging between the mutually continuous blocks which comprise the said standing hole structure, and the part ranging between the said both blocks of the said linear part was fixed with the said earthquake-resistant fixing tool. Thus, when the frame block and the side block block are relatively moved by the earthquake motion, an excessive load on the cable can be reduced.

  Further, in the present invention, the seismic fixing tool eases an excessive load acting on the fixed portion of the cable by gripping the cable while allowing the cable to move in the cable axial direction. be able to.

  The earthquake-resistant fixture according to the present invention is an earthquake-resistant fixture used in the cable laying structure of the management facility according to claims 1 to 4 or 5, wherein one end is fixed to the standing hole structure by a fixing member. And a cable gripping portion that is integrally provided on the other end surface of the fixed piece and through which the cable is inserted. The cable gripping portion includes a detachable opening at the protruding end portion, and is fixed to the cable. When the above force is applied, the cable can be easily fixed to the inner wall portion of the vertical hole structure by expanding the detachable opening and separating it from the cable gripping portion. Work efficiency is improved.

  Further, in the present invention, the cable gripping portion is provided with a shearing cable protection portion by chamfering at both end opening edges of the cable gripping portion, and a detachable cable protection portion by chamfering processing at the inner edge portion of the attachment / detachment opening. Due to the provision, the cable is hardly damaged.

It is a longitudinal cross-sectional view which shows the pipeline facility using the cable laying structure of the pipeline facility which concerns on this invention. It is an AA line sectional view same as the above. It is a BB line sectional view same as the above. It is a partial expanded view of the inner wall surface part of a standing hole structure for demonstrating arrangement | positioning of each fixing tool. (A) The front view which shows an example of the earthquake-resistant fixing tool in FIG. 1, (b) is the side view, (c) is the CC sectional view taken on the line. It is sectional drawing which shows the attachment state of the earthquake-resistant fixing tool in FIG. It is a partial expanded cross-sectional view for demonstrating the behavior of the cable at the time of earthquake motion occurrence. It is a partial expanded longitudinal cross-sectional view for demonstrating the behavior of the cable at the time of earthquake motion occurrence. (A) is the front view which shows another example of the earthquake-resistant fixing tool in FIG. 1, (b) is the side view, (c) is the DD sectional view taken on the line. It is the schematic of the pipeline facility for demonstrating the cable laying state of a pipeline facility. It is sectional drawing which shows the use condition of the conventional saddle type fixing tool.

  Next, an embodiment of the cable laying structure for the pipeline facility according to the present invention and the seismic fixing tool used for the same will be described based on the embodiments shown in FIGS.

  Further, in the present embodiment, a case where a cable 1 such as an optical fiber cable is laid in a pipeline facility having a vertically-oriented cylindrical upright structure 2 such as a human hole in the middle of the pipeline is denoted by reference numeral 2 in the figure. Is a vertical hole structure such as a human hole, and reference numeral 4 is a pipe body for a sewer that constitutes a sewer pipe connected to the vertical structure 2. In addition, the same code | symbol is attached | subjected and demonstrated to the structure similar to the above-mentioned prior art example.

  The vertical hole structure 2 is formed in a vertical cylindrical shape by stacking the precast concrete frame block 7, the intermediate block 8 and the upper end block 9 in the vertical direction, and the tube rod tube 4 on the peripheral wall of the frame block 7. , 4 are connected via a flexible joint 20. In addition, the code | symbol 21 in a figure is invert concrete.

  The cable 1 is laid in the management facility by passing the cable 1 from the upstream pipe body 4 through the vertical structure 2 to the downstream pipe body 4 and connecting the cable 1 to the management pipe. It has the structure fixed to the inner peripheral surface part of the pipe bodies 4 and 4 and the vertical wall structure 2 inner wall part.

  The portion laid in the vertical hole structure 2 of the cable 1 includes both straight portions 5a and 5b drawn upward from the openings of the tube rod tubes 4 and 4 and the one straight portion 5a. And a curved portion 6 arranged in a semicircular arc along the inner circumference of the inner wall of the structure from the upper end to the upper end of the other straight portion 5b, and the height of the curved portion 6 is constant from the upper surface of the invert concrete 21 The curved portion 6 does not obstruct the flow of maintenance work and avoids the influence of the sewage flow.

  As shown in the development view shown in FIG. 4, the portion 22 extending over the straight portions 5a, 5b and the curved portion 6 of the cable 1 is formed in an arc shape, and the straight portions 5a, 5b and the curved portion 6 are smoothly continuous. To be arranged.

  In this embodiment, both the straight portions 5a and 5b are disposed so as to straddle the housing block 7 and the intermediate block 8, and the height position of the curved portion 6 is determined from the joint 2a between the housing block 7 and the intermediate block 8. I try to be on top.

  For the laying of the cable 1 in the vertical structure 2, two types of fixings, the saddle type fixing device 3 similar to the conventional example shown in FIG. 11 and the seismic fixing devices 30, 30... Shown in FIG. The tool 23 is used, the lower end of both straight portions 5a, 5b, both ends of the portion 22 straddling the straight portions 5a, 5b and the curved portion 6, and the portion 23 of the straight portions 5a, 5b straddling the housing block 7 and the intermediate block 8. Are fixed by means of seismic fixing tools 30, 30... And the other parts are fixed by saddle type fixing tools 3.

  That is, in the straight portions 5a and 5b, the portion closest to the opening of the tube rod tubes 4 and 4, the vicinity of the curved portion 6, and both sides sandwiching the joint between the rod block 7 and the side block are fixed for earthquake resistance. It fixes with tool 30a, 30b, 30c, and in the curved part 6, the position nearest to the both ends, ie, each linear part 5a, 5b, is being fixed with the earthquake-resistant fixing tool 30b.

  The seismic fixing tool 30 includes a cable gripping portion 31 that grips the cable 1, and a certain force or more, for example, a force of 10 kgf or more, that directs the cable gripping portion 31 toward the cable 1 toward the protruding end of the cable gripping portion 31. The cable 1 is used so that the cable 1 is detached when acted.

  As shown in FIGS. 5 and 6, the seismic fixing tool 30 is integrally formed of a synthetic resin material having elasticity, and a fixing piece 33 for fixing one end to the standing hole structure 2 by a fixing member 32 such as an anchor bolt. And a cable gripping portion 31 that protrudes integrally with the other end surface of the fixed piece 33.

  The fixing piece 33 is formed in a rectangular flat plate shape, and an insertion hole 34 penetrating in the plate thickness direction through which a fixing member 32 such as an anchor pin or an anchor bolt is inserted is formed at one end in the longitudinal direction. Even when the cable 1 is gripped, it can be easily fixed to the inner wall portion of the vertical hole structure 2.

  The cable gripping portion 31 includes a round hole-shaped cable insertion portion 35 that is formed in a rectangular parallelepiped shape and extends in a direction parallel to the surface of the fixed piece 33 and intersects with the longitudinal direction of the fixed piece 33. The cable 1 is gripped by the cable gripping portion 31 by inserting the cable 1.

  The cable insertion portion 35 is formed in a round hole shape having the same diameter as or slightly smaller than the outer diameter of the optical fiber cable 1 to be used, and the cable gripping portion 31 grips the cable 1 in a state in which the cable 1 is allowed to move in the cable axial direction. It is supposed to be.

  Further, the cable insertion portion 35 is formed with a shear cable protection portion 36 by chamfering the C surface or the R surface at both ends of the opening edge portion of the cable insertion portion 35, so that the cable 1 moves relative to the cable grip portion 31 in the shear direction. The cable 1 is not easily damaged.

  Further, the cable gripping portion 31 is provided with a notch-like attachment / detachment opening 37 parallel to the cable insertion portion 35 at the protruding end, and the cable 1 can be attached to and detached from the cable gripping portion 31 through the attachment / detachment opening 37. It has become.

  The detachable opening 37 is formed in a trapezoidal (V-shaped) groove shape that expands on the protruding end surface side, and has a structure in which the cable 1 is easily attached to the cable gripping portion 31 and is not easily detached. The cable 1 gripped by the cable gripping portion 31 is made to detach from the cable gripping portion 31 by spreading the detachable opening 37 only when a certain level of force is applied toward the protruding end of the cable gripping portion 31. ing.

  A detachable cable protection portion 38 is formed by chamfering the C surface or the R surface at the outer edge portions of the inclined surfaces of the detachable opening portion 37 that face each other, and when the cable 1 is attached to or detached from the cable grip portion 31. The cable 1 is made difficult to be damaged.

  In the cable laying structure of the pipeline facility constructed as described above, in normal times, both the straight portions 5a, 5b and the curved portion 6 are respectively provided with a plurality of fixtures 3, 3 ... and earthquake-resistant fixtures 30, 30. .. is firmly fixed to the inner wall surface of the vertical structure 2 and is maintained without slack, so that the cable 1 does not move or vibrate even when a load is caused by fluctuations in the sewer water level or inflow of rainwater. It has become.

  On the other hand, when the pipe body 4 or 4 moves relative to the vertical hole structure 2 due to a large-scale earthquake motion or the like, a tensile force acts on the cable 1 laid in the vertical hole structure 2 accordingly. The cable 1 is detached from the earthquake-resistant fixtures 30, 30..., And the tensile force acting on the cable 1 is relaxed.

  Specifically, when the pipe body 4 is moved relative to the vertical hole structure 2 by the seismic motion, the end face of the pipe body 4 presses the lower ends of the straight portions 5a and 5b inward. As a result, a tensile force acts on the cable 1.

  At that time, the seismic fixing fixture that fixes the lower end of the upstream straight portions 5a and 5b and the vicinity of the ends of the pipe body 4 and 4 by the displacement of the cable 1 due to the pushing of the pipe body 4 and 4 When a force of a certain level or more, for example, 10 kgf or more acts on 30a, 30a, the cable gripping portion 31 is elastically deformed by being pressed by the cable 1, and the attachment / detachment opening 37 is expanded, as shown by a one-dot chain line in FIG. In addition, the cable 1 is detached from the earthquake-resistant fixtures 30a and 30a.

  When the cable 1 is detached from the earthquake-resistant fixtures 30a and 30a, the tensile force acting on the cable 1 is relaxed, and a great load is prevented from being generated on the cable 1 and the fixing portion of the cable 1. ing.

  On the other hand, when the seismic motion causes the pipe body 4 to move relative to the vertical structure 2 in the pushing direction, or the pipes 4 and 4 move relative to the vertical structure 2 in the pulling direction. When the cable 1 in the vertical hole structure 2 is drawn to the tube side, a tensile force acts on the cable 1 accordingly.

  At that time, the cable 1 is detached from the earthquake-resistant fixtures 30b and 30b for fixing the portion 22 straddling the straight portions 5a and 5b and the curved portion 6, and the tensile force acting on the cable 1 is relaxed.

  That is, when a tensile force acts on the cable 1, a component force toward the center of the radius is generated at each fixed portion of the curved portion 6, as shown in FIG. A pressing force toward the protruding end side of the cable gripping portion 31 acts.

  When this pressing force exceeds a certain value, for example, 10 kgf or more, the seismic fixtures 30 b and 30 b are pressed against the outer peripheral surface of the cable 1 to push open the detachable opening 37, and from the cable gripping portion 31. The cable 1 is disconnected.

  Then, the cable 1 is loosened when the cable 1 is detached from the earthquake-resistant fixtures 30b and 30b that have fixed the portion 22 straddling the straight portions 5a and 5b and the curved portion 6, and the cable 1 and the fixed portion of the cable 1 are fixed. This prevents a great load from being generated.

  Further, when a displacement occurs between the housing block 7 and the intermediate block 8 (side block), and a shearing force acts on a portion 23 straddling the housing block 7 and the intermediate block 8 of each linear portion 5a, 5b, When the shearing force exceeds a certain value, for example, 10 kgf or more, as shown in FIG. 8, one of the earthquake-resistant fixtures 30c, 30c that fixes both ends of the portion 23 straddling the housing block 7 and the intermediate block 8, or In both cases, the cable 1 is detached from the cable gripping portion 31, and an excessive shearing force is prevented from acting on the portion.

  In the above-described embodiment, an example in which two types of fixtures, that is, the saddle type fixture 3 and the earthquake-resistant fixture 30 are used for laying the cable 1 in the vertical hole structure 2, has been described. The seismic fixing tool 30, 30 ... may be used.

  Moreover, the aspect of the earthquake-resistant fixture 30 is not limited to the above-described embodiment. For example, as illustrated in FIG. 9, the shape of the cable insertion portion 40 of the cable gripping portion 31 is formed in a U-shaped hole shape when viewed from the side. It may be. In addition, the same code | symbol is attached | subjected to the structure similar to the above-mentioned Example, and description is abbreviate | omitted.

1 cable (optical fiber cable)
2 Vertical structure 3 Saddle type fixture 4 Pipe rod tube 5 Straight portion 6 Curve portion 7 Rod block 8 Intermediate block 9 Upper block 10 Grip portion 11 Fixing portion 12 Anchor member 20 Flexible joint 21 Invert concrete 22 Cable A portion straddling the straight portion and the curved portion 23 A portion straddling the frame block and the intermediate block of the straight portion 30 Seismic fixing tool 31 Cable gripping portion 32 Fixing member 33 Fixing piece 34 Insertion hole 35 Cable insertion portion 36 Shear cable protection Part 37 opening for attaching / detaching 38 cable protecting part for attaching / detaching 40 cable insertion part

Claims (8)

A structure for laying a cable in a pipeline facility having a vertically-oriented cylindrical vertical hole structure in the middle of the pipeline,
In a portion laid in the vertical hole structure of the cable, a straight portion drawn upward along the inner wall of the vertical hole structure from each tubular rod body, and the other straight line from the upper end of the one straight portion A curved portion arranged in an arc shape along the inner periphery of the vertical hole structure over the upper end of the vertical portion, and the straight line portion and the curved portion are fixed to the inner wall of the vertical hole structure by a plurality of fixtures. In the cable laying structure of the pipeline facility
Using a seismic fixture for some or all of the fixtures;
The seismic fixture is integrally formed of a synthetic resin material having elasticity, and one end in the longitudinal direction is fixed to the inner surface of the standing hole structure by an anchor-type fixing member; A cable gripping part protruding from the end surface and gripping the cable,
Cable laying in a pipeline facility characterized in that the cable gripping portion has a detachable opening at the projecting end, and the cable is detached from the cable gripping portion when a certain force is applied to the cable. Construction.   The cable laying structure for a pipeline facility according to claim 1, wherein a lower end of the straight portion is fixed to the inner wall of the vertical hole structure by the earthquake-resistant fixture. The cable laying structure for a pipeline facility according to claim 1 or 2, wherein both sides of a portion straddling the straight portion and the curved portion are respectively fixed by the earthquake-proof fixture. 2. The straight line portion is disposed between blocks that constitute the standing hole structure and are continuous with each other , and both sides of a portion of the straight line portion that is straddled between the two blocks are fixed by the earthquake-proof fixture. 2. A cable laying structure for a pipeline facility according to 2 or 3.   The cable laying structure for a pipeline facility according to claim 1, wherein the seismic fixture is configured to grip the cable in a state in which the cable is allowed to move in the cable axial direction. An anti-seismic fixing tool for use in the cable laying structure of the management facility according to claim 1, wherein
A fixing piece for fixing one end to the vertical hole structure by an anchor-type fixing member , and a cable gripping part that is integrally projected on the other end surface of the fixing piece and through which the cable is inserted,
An attaching / detaching opening is provided at the protruding end of the cable gripping portion, and when the cable is applied with a force exceeding a certain level, the cable pushes the attaching / detaching opening and separates from the cable gripping portion. Seismic fixing tool characterized by that.   The earthquake-resistant fixture according to claim 6, wherein a shearing cable protection part is provided by chamfering at both end opening edges of the cable gripping part.   The earthquake-resistant fixture according to claim 6 or 7, further comprising a detachable cable protector by chamfering at an inner edge of the detachable opening.

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