JP2006087176A - Cable support structure and its construction technique - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate working construction by putting, in a simple configuration, a support structure for a vertical trunk cable in a high-rise apartment house, while securing safety to be the same level as those of conventional. <P>SOLUTION: This cable supporting structure 10 is equipped with a cable 14 and a messenger wire 21 which extend to lower stories, being hung down severally by hangers 18 at the top, a coupling members 22 which couples the cable 14 and the messenger wire 21 at plural points in the middle, and a fixing member 19 which fixes the bottom of the messenger wire 21 to the messenger wire 21 to a building. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cable support structure and a construction method thereof. More particularly, the present invention relates to a structure for supporting a cable with a branch of a vertical trunk line in a high-rise house or the like and a construction method thereof.

JP2001-147358 JP2002-84635

  As long as the trunk cable passing through each floor of the building is a relatively light cable such as an optical communication cable, it is only necessary to suspend it as in Patent Document 1. Even when there are many branch cables, the main cables are not so burdened by holding each branch cable on the wall surface. Patent Document 2 discloses filling a heat-resistant sealing material after passing a cable through a through-hole on each floor.

  For power wiring of high-rise housing, for example, a triplex trunk cable with three single-core cables attached in parallel or provided with twist is suspended so as to penetrate each floor and branch into each floor Take the wiring. Conventionally, such a main line cable is suspended from the uppermost ceiling slab 102 of the cable 101 and fixed to the wall surface 104 with a support fitting 103 while the upper end of the cable 101 is suspended from the ceiling slab 102 of the uppermost floor as in the support structure 100 shown in FIG. Support by doing. The lower end of the cable 101 is connected to the switchboard.

  When such a cable 101 is tightened or tension is applied, the internal electric wire is damaged. Therefore, as shown in FIG. 10, the upper end is held so as to be wrapped by a net 105a of the net grip 105, and the upper end of the net grip is suspended. Using a U-shaped shackle 107 and a bolt 108, the lowering rod 106 is suspended from a substantially U-shaped hook 109 embedded in a ceiling slab (reference numeral 102 in FIG. 9).

  Then, as shown in FIG. 11, a rubber sheet 110 having a non-slip groove formed around the cable 101 is wound and sandwiched between a pair of arc-shaped clamps 111, and then the base end of the clamp 111 is fixed to the wall surface in advance. The channel 112 having a substantially C-shaped cross section is engaged. The rubber sheet 110 serves to protect and insulate the cable 101. The tips of the clamps 111 are fastened with bolts 113 and nuts 114.

  In order to construct the above support structure 100, first, as shown in FIG. 12, the channel 112 is fixed to the wall surface 104 of each floor. Next, a pulley 115 is attached to a hook 109 fixed to the ceiling slab 102 on the uppermost floor, and a pulling wire 117 pulled out from the winch 116 is passed through the pulley 115 and lowered to the lowermost floor. Then, the end of the pulling wire 117 is connected to the net grip 105 attached to the tip of the cable 101 drawn from the cable drum 119. The cable 101 is pulled up to the top floor by winding the pulling wire 117 with the winch 116 from the state of FIG.

 Next, as shown in FIG. 10, the end of the cable 101 is hung on a hook 109 fixed to the ceiling slab on the top floor (reference numeral 102 in FIG. 9), and then attached to the wall surface (reference numeral 104 in FIG. 9). The cable 101 is held in the channel 112. In addition, although the space | interval of the channel 112 holding the cable 101 is based on the magnitude | size of external force, such as an assumed earthquake, it is about 1-2 places normally on each floor.

  In the conventional support structure 100, it is complicated to fix a large number of channels 112 on the wall surface 104 of each floor in advance. In addition, when electrical installation work or piping work is performed in the vicinity of the wall surface 104 first, it becomes difficult to take a route for passing the cable 101 to the vicinity of the wall surface 104, and it is necessary to attach the channel 112 somewhat away from the wall surface 104. . Further, the work of winding the rubber sheet 110 or the like around the cable 101 or sandwiching them with the clamp 111 is complicated. The technical problem of the present invention is to make the supporting structure of a vertical trunk cable such as a high-rise house a simple structure while ensuring the same level of safety as in the past, and to facilitate construction work.

  The cable support structure of the present invention is a cable support structure that is vertically routed through each floor of a building, and is suspended at the upper end and extended to the lower floor, and suspended at the upper end. A messenger wire that extends downward in parallel with the cable and has a lower end fixed thereto, and a coupling member that couples the cable and the messenger wire at a plurality of points in the middle. In such a support structure, it is preferable to include a steady rest for holding a plurality of locations on the messenger wire in the building structure. Furthermore, it is preferable that the coupling member is made of an electrically insulating material.

  In the construction method of the present invention, a cable and a messenger wire are connected in advance at a plurality of locations, the upper ends of both are pulled up by a pulling wire and hung on a slab or wall on the upper floor, and then the lower end of the messenger wire is connected to the lower floor. It is characterized by being fixed to a building structure.

  In the cable support structure of the present invention, the cable is coupled to the messenger wire at a plurality of positions, and the upper end and the lower end of the messenger cable are fixed to a building structure such as a ceiling surface and a floor surface. Thereby, the external force applied to the cable is supported by the messenger wire, and the force is transmitted to the building at the upper and lower ends. In this way, the messenger wire only needs to be fixed to the building structure at the top and bottom, and the cable and messenger wire can be pre-coupled at one location, eliminating the need to install channels on each floor. It is unnecessary to wrap a rubber sheet around the cable and clamp it with a clamp.

  In the case of a support structure equipped with a steady rest that holds the messenger wire in the middle of the building structure, even if a large external force is applied due to an earthquake or the like, the swing width of the messenger wire and cable may be limited. It is possible to increase safety. Further, when the coupling member is formed of an electrically insulating material, electricity does not flow through the messenger wire even if the cable leaks.

  In the construction method of the present invention, the cable and the messenger wire are pre-coupled at a plurality of points in the middle, so that the channel installation work, rubber sheet winding work, clamping work, etc. Less work is done and the construction period is shortened.

  Next, the support structure and construction method of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view showing an embodiment of the support structure of the present invention, FIG. 2 is a perspective view of the main part showing the vicinity of the upper end of the support structure, and FIG. 3 is a schematic view showing another embodiment of the support structure of the present invention. 4 is a side view of the main part showing the middle of the support structure in FIG. 1, FIG. 5 is a perspective view showing an embodiment of a cable / wire coupling member used in the support structure, and FIG. FIG. 7 is a schematic side view showing an embodiment of the construction method of the present invention, and FIG. 8 is a perspective view of the main part showing another embodiment of the support structure of the present invention.

  A cable support structure 10 shown in FIG. 1 is for supporting a cable 14 that is routed vertically through a through-hole 13 formed in a floor slab 12 of each floor of a building 11. The support structure 10 includes a hanging tool 18 fixed to the ceiling slab 15 on the uppermost floor, a cable 14 having an upper end suspended by the hanging tool 18 and extending to the lowermost floor, and the hanging tool 18. The messenger wire 21, which is suspended by the cable 14, extends downward in parallel with the cable 14, and has a lower end fixed to the lowermost wall 20 or the floor slab 12 by the fixing member 19, and the cable 14 and the messenger wire 21, And a coupling member 22 coupled at a plurality of locations.

  As the cable 14, a triplex trunk cable in which three single-core cables (reference numeral 24 in FIG. 2) are attached in parallel or provided with a twist, particularly, a branch cable 25 having branch cables 25 to each floor is provided. For example, a trunk cable. However, it can also be used for other cable support structures such as a quadraplex cable in which four single-core cables are twisted together, or a cable in which multiple cores are sheathed together.

  As the messenger wire 21, a wire used to suspend a power line across a normal power pole is adopted. As such a wire, a wire formed by twisting seven steel strands having an outer diameter of 1 to 3 mm, particularly 2 mm, and having an outer diameter of about 4 to 8 mm, particularly about 6 mm, is used. It is preferable that the tensile strength of the wire is about 50 N and the mass per length is about 0.1 to 0.2 kg / m, particularly about 0.17 kg / m. For example, a galvanized steel wire JISG3537 (1976) 2.0 mm finished wire having a finished outer diameter of 6.0 mm, a calculated cross-sectional area of 22 mm2, and a tensile load of 1.42 tf is used. In the case of a high-rise building, the cable 14 may be extended by a plug connection. In this case, the messenger wire 21 may not be provided with a connecting portion, and may be detachably connected by a known joint in which an ice price or a compression stopper is combined with a clevis.

  As shown in FIG. 2, the hanging tool 18 includes a hanging fitting 27 fixed to the ceiling slab 15 and a shackle 29 attached to each of two holes 28 formed in parallel to the hanging fitting. As the hanging metal fitting 27, an angle member is cut into a predetermined size, two holes 28 are formed on a vertical wall surface, and a hole through which the mounting screw 30 is passed is formed on a horizontal wall surface. The attachment screw 30 is screwed into an insert hardware 31 provided with a female screw attached to the ceiling slab 15. The insert hardware 31 may be arranged at a predetermined position before placing concrete, or may be driven after placing. Instead of using the hanging bracket 27, it is possible to simply fix two eyebolts and use it as a hanging tool. Moreover, the hole 28 of the hanging bracket 27 may be provided at one place, and the cable 14 and the messenger wire 21 may be hung at one place where the shackle 29 is hung. Furthermore, as shown in FIG. 3, the end of a horizontally long U-shaped or Ω-shaped hook 37 can be embedded and fixed in a ceiling slab (reference numeral 15 in FIG. 1) to form a hanging bracket. In either case, it can also be used as a hook 60 for hanging a pulley (see reference numeral 63 in FIG. 7) described later.

  As in the conventional case (see FIG. 10), the upper end of the cable 14 is fixed by covering the net 32a of the net grip 32 through an insulating cap as shown in FIG. The upper end of the messenger wire 21 forms a so-called heart thimble 35 in which a curved tip is joined to another portion by a thimble 33 and bundled by a winding clip 34. The shackle 29 is a well-known thing which consists of a U-shaped main body and the bolt 36 for closing between the front-end | tips of the main body. However, other couplers or couplers designed for exclusive use can also be used. The shackle 29 passes the main body through a hanging rod 32 b at the upper end of the net grip 32 and the heart thimble 35. However, the bolt 36 may be passed through the hanging rod 32b or the heart thimble 35.

  As shown in FIG. 4, thimbles 33 are fastened at almost equal intervals, for example, 1.5 to 2 m, in the middle of the messenger wire 21, and the coupling member 22 is locked to the thimbles 33. The thimble 33 is formed from a metal plate material having plasticity that can be crimped, such as a metal plate material such as stainless steel, and has a cylindrical shape separated in the middle. Then, it is fixed around the messenger wire 21 by caulking.

  As shown in FIG. 5, the coupling member 22 includes a main body 38, a first pressing member 39 that sandwiches a messenger wire between the main body 38, and a second pressing member 40 that clamps a cable between the main body 38. It consists of three members. The main body 38 has a substantially rectangular parallelepiped shape. A groove 41 having a semicircular cross section that sandwiches the messenger wire is formed on one surface, and a recess 42 having a semicircular cross section that sandwiches the cable is formed on the other surface.

  The first pressing member 39 is formed with a semicircular groove 43 that sandwiches the messenger wire on the surface on the main body 38 side, and is provided with a pair of screw insertion holes 44a for passing screws 44 attached to the main body 38.

  The second pressing member 40 has substantially the same form as the main body 38 except that the second pressing member 40 does not have the groove 41. That is, it has a substantially rectangular parallelepiped shape, and a recess 45 having a semicircular cross section is formed on the surface on the main body side. Further, a pair of screw insertion holes 47 for passing screws 46 for fixing the second pressing member 40 to the main body 38 are formed in the vicinity of both ends. On the surface of the main body 38 on the second pressing member side, a female screw 48 that is screwed with the screw 46 is formed. The female screw 48 penetrates between the opposite surfaces and is a female screw that is screwed with the screw 44 for attaching the first pressing member 39. However, a separate female screw may be formed.

  The main body 38, the first pressing member 39 and the second pressing member 40, in particular, the main body 38 and the second pressing member 40 sandwiching the cable are preferably made of a synthetic resin having electrical insulation. When formed of metal, it is preferable to provide an insulating layer such as a rubber lining in the recesses 42 and 45 of the main body 38 and the second pressing member 40.

  Further, in this embodiment, semi-cylindrical engagement protrusions 49 are formed on the upper and lower surfaces of the main body 38 so as to protrude so as to surround the recess 42. These engaging projections 49 are used to wrap a synthetic resin binding band for wiring (a so-called insulation lock, hereinafter referred to as a binding band) 50 used for bundling electric wires and the like. For this purpose, a gutter 51 is provided. As a result, the engagement protrusion 49 has a substantially L-shaped cross section. The engagement protrusion 49 is made thick enough to be bent by tightening with the binding band 50. The first pressing member 39 and the second pressing member 40 may be plate-shaped members that are each curved in a semicircular shape. The engagement protrusion 49 may be provided on the second pressing member 40 side.

  As shown in FIG. 4, the coupling member 22 configured as described above sandwiches the messenger wire 21 between the main body 38 and the first pressing member 39, and connects the cable 14 between the main body 38 and the second pressing member 40. By sandwiching, the middle portions of the cable 14 and the messenger wire 21 can be coupled to each other at a predetermined interval so that both are substantially parallel. When the above-described engaging protrusion 49 is provided on the main body 38, the cable 14 can be strongly tightened with respect to the main body 38 by the binding band 50. Thereby, the cable 14 can be more reliably clamped.

  As shown in FIG. 6, the lower end of the cable 14 is led to the switchboard through the through hole 13 formed in the floor slab 12 on the lowest floor. The lower end of the messenger wire 21 is locked to a fixing member 19 such as an eyebolt fixed to the wall 20 on the lowest floor. The fixing member 19 can also be attached to the floor surface. Furthermore, in this embodiment, the aforementioned heart thimble 35 is formed at the lower end of the messenger wire 21, and the turnbuckle 54 is interposed between the heart thimble 35 and the fixing member 19. Thereby, an appropriate tension can be applied to the messenger wire 21 after the construction work or at the time of maintenance. The turnbuckle 54 can also be provided on the upper end side or in the middle of the messenger wire 21. However, maintenance near the bottom is easier.

  To construct the cable support structure 10 described above, first, a suspension member such as a hook 60 is attached to the ceiling slab 15 on the uppermost floor, as shown in FIG. The hanging tool 18 of FIG. 2 or the hook 37 of FIG. 3 can also be used. Then, the pulling wire 62 of the winch 61 is fed out, passed through the pulley 63 suspended from the hook 60, and lowered to the lowest floor. Next, thimbles (caulking metal fittings) 33 are attached to the messenger wire 21 at predetermined intervals. Next, the coupling member 22 is attached to each thimble 33 and the cable 14 is fixed in parallel to the messenger wire 21. The work of fixing the messenger wire 21 and the cable 14 in parallel may be processed in advance in a factory. Even in this case, both can be wound together around a cable drum (see reference numeral 119 in FIG. 12).

  Next, the lower end of the pulling wire 62 is detachably connected to the upper end of the cable 14 and the messenger wire 21. Further, the pulling wire 62 is wound up by the winch 61, and the cable 14 and the messenger wire 21 are pulled up to the uppermost floor and hung on a hanging tool (see reference numeral 18 in FIG. 1). Then, the pulling wire 62 is removed from the messenger wire 21 or the like. Further, the lower end of the messenger wire 21 is locked to the fixing member 19 shown in FIG. Thereby, the support structure 10 shown in FIG. 1 is obtained.

  As described above, in this support structure 10, the cable 14 is fixed to the messenger wire 21 in parallel, and the messenger wire 21 capable of applying sufficient tension is connected to the ceiling on the top floor and the wall or floor on the bottom floor. It is not necessary to directly fix the cable 14 to the building structure. Therefore, it is not necessary to attach in advance a component for laying the cable on the wall 20, for example, the channel 112 of FIG. Further, the messenger wire 21 and the cable 14 can be combined in advance at one place such as the lowest floor before the cable is suspended. Accordingly, it is possible to greatly reduce the troubles such as carrying in and installing parts for installation on each floor and the movement of workers.

  It should be noted that the attachment pitch of the coupling member 22 to the messenger wire 21 need not match the height of each floor, and may be attached at a predetermined pitch. Therefore, it can be combined in advance at a factory. Furthermore, if the messenger wire 21 and the cable 14 are combined in advance in a factory equipped with facilities, a highly accurate connection is possible.

  In the said embodiment, the messenger wire 21 is being fixed to the building structure only by the upper end and the lower end. However, if necessary, as shown in FIG. 8, an excessive shake of the messenger wire 21 is prevented by using a steady rest 64 (or a steady rest 71 fixed to a wall surface described later) fixed to the floor. May be. 8 is attached to an anchor 65 provided with an internal thread embedded in the floor 12 of each floor, an angle member 67 fixed with the anchor 65 and a bolt 66, and the angle member 67. A U bolt 68 and a nut 69 for attaching the U bolt to the angle member 67 are configured. Instead of the angle member 67, another support member such as a channel member (grooved steel) may be used.

  Since the messenger wire 21 is fixed to the building structure only at the upper and lower ends as described above, the messenger wire 21 can be passed away from the wall. In that case, as described above, the steady rest 64 is provided on the floor surface. However, when construction near the floor is difficult, a channel member (grooved steel) 70 is fixed to the wall 20, and a U-bolt 68 is attached to the channel member 70 to constitute a wall steady rest 71. You can also. Instead of the channel material 70, other support members such as an angle material can be used. Even when it is provided on either the floor side or the wall side, the messenger wire 21 is not tightened tightly, and the swing range may be limited to a predetermined range. This facilitates the work when adjusting the tension of the messenger wire 21 with the turnbuckle 54 of FIG. However, it may be tightened as necessary.

  In the case where the above-described steady rests 64 and 71 are provided, even if a lateral swing occurs due to an earthquake or the like, the swing width can be reduced, so that the upper end hanging tool 18 or the lower end fixing member 19 is turned sideways. The force applied to can be reduced. Thereby, for example, even when a force in the direction of pulling out from the wall is applied to the fixing member 19 such as the eyebolt in FIG. 6, the force can be suppressed, and safety is improved. The steady rests 64 and 71 may not be provided on each floor, and may be provided on a plurality of floors. However, the interval is determined so that the natural frequency of the cable 14 and the messenger wire 21 do not match the earthquake frequency. preferable.

It is a schematic side view which shows one Embodiment of the support structure of this invention. It is a principal part perspective view which shows the upper end vicinity of the support structure. It is a principal part perspective view which shows other embodiment of the support structure of this invention. It is a principal part side view which shows the middle of the support structure of FIG. It is a perspective view which shows one Embodiment of the cable wire connection member used for the support structure. It is a principal part perspective view which shows the lower end vicinity of the support structure. It is a schematic side view which shows one Embodiment of the construction method of this invention. It is a principal part perspective view which shows other embodiment of the support structure of this invention. It is a schematic side view which shows an example of the conventional support structure. It is a principal part perspective view which shows the upper end vicinity of the support structure. It is a perspective view which shows the middle of the support structure. It is a schematic side view which shows an example of the construction method of the conventional support structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cable support structure 11 Building 12 Floor slab 13 Through-hole 14 Cable 15 Ceiling slab 18 Suspension tool 19 Fixing member 20 Wall 21 Messenger wire (suspending line)
22 Connecting member 24 Single-core cable 25 Branch cable 27 Hanging bracket 28 Hole 29 Shackle 30 Mounting screw 31 Insert hardware 32 Net grip 32a Net grip net 32b Net grip hanging rod 33 Thimble 34 Winding clip 35 Heart thimble 36 Bolt 37 Hook 38 Main body 39 First pressing member 40 Second pressing member 41 Groove 42 Recess 43 Groove 44 Screw 44a Screw insertion hole 45 Recess 46 Screw 47 Screw insertion hole 48 Female screw 49 Engagement protrusion 50 Binding band (Synthetic resin binding for wiring band)
51 鍔 54 Turnbuckle 60 Hook 61 Winch 62 Lifting wire 63 Pulley 64 Stabilizer 65 Anchor 66 Bolt 67 Angle material 68 U bolt 69 Nut 70 Channel material 71 Stabilizer

Claims (4)

A cable support structure that runs vertically through each floor of the building,
A cable suspended at the upper end and extending to the lower floor,
A messenger wire suspended at the upper end, extending downward in parallel with the cable, and fixed at the lower end;
A cable support structure comprising: a coupling member that couples the cable and the messenger wire at a plurality of locations along the way.   The cable support structure according to claim 1, further comprising a steady rest for holding a plurality of locations in the middle of the messenger wire in a building structure.   The cable support structure according to claim 1, wherein the coupling member is formed of an electrically insulating material. Connect the cable and messenger wire in advance at multiple locations,
While pulling up the upper end of both with a lifting wire, hang it on the building structure on the upper floor,
Next, fix the lower end of the messenger wire to the building structure on the lower floor,
Construction method of cable support structure.

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