JP4830780B2 - Cable rack connection structure - Google Patents

Description

  The present invention relates to a cable rack connection structure, and more particularly, to a technique for connecting ends in a longitudinal direction of a cable rack with a connection fitting.

  Conventionally, as shown in FIGS. 6 and 7, there is an expansion connection fitting 1 </ b> A as a connection fitting for connecting ends in the longitudinal direction of the cable rack 4. The expansion connection fitting 1A is fastened so as to be displaceable with respect to the cable rack 4 so as to connect the cable racks 4 to each other.

  That is, both sides of the expansion fitting 1A are respectively connected to the connecting portion 2, the hole 6 provided in the cable rack 4 in the connecting portion 2 is a long hole 9 in the longitudinal direction, and the inner surfaces on both sides of the expansion connecting fitting 1A are connected to the two cable racks 4A. The bolt 7 that is a half screw inserted from the long hole 9 a provided in the connection portion 2 is passed through the hole 5 provided in the cable rack 4, and a nut 8 is attached to the screw portion at the tip of the bolt 7. They are connected by screwing. Here, the bolt 7 to be used has a shaft portion 19 protruding from the head portion 18 as shown in FIG. 7B, and a square base portion 20 having a square shape is provided on the protruding base portion of the shaft portion 19. The cable rack 4 is of a half screw type having a screwless portion 23 between the male screw portion 21 and the square base portion 20 at the tip of the shaft portion 19, so that the cable rack 4 can be used even when the nut 8 is completely tightened to the male screw portion 21. And the connection bracket 1 are not fastened by bolts 7 and nuts 8 in close contact (that is, the cable rack 4 and the expansion bracket 1A are connected in a non-contact state), and the cable rack 4 is inserted into the elongated hole 9a of the connection bracket 1. The cable rack 4 is configured to be slidable along the long hole 9a to absorb meandering and deformation when the cable rack 4 expands and contracts due to heat.

  Here, the cable rack 4 and the expansion bracket 1A are connected in a non-contact state so as to be displaceable with respect to the cable rack 4, so that the vicinity of the connection portion of the cable rack 4 can be bracketed in preparation for an unexpected situation. It is necessary to support it with the support member 22 of this. In addition, since the expansion metal fitting 1A cannot be grounded, it is necessary to separately construct a ground bond wire, which increases the cost and makes the construction complicated, and the bolt 7 as shown in FIG. Since it is necessary to use the bolt 7 of a half screw specification, there exists a problem that a cost is high also in this point and construction is troublesome.

On the other hand, as shown in FIG. 8, the normal connection fitting 1 </ b> B is fastened and fixed using bolts 7 using all screws, and there is no need to separately ground (for example, see Patent Document 1). . In addition, the insertion hole 9b, which is a hole 6 through which the bolt 7 provided in the connection part 2 on both sides of the connection fitting 1B is inserted, is formed slightly larger than the fastening member in the longitudinal direction. It can be said that it can respond. However, whether or not it can actually be handled depends on the state at the time of construction, and when constructed with the ends of the cable racks 4 in contact with each other, after all, it cannot cope with thermal expansion. There is a problem that the cable rack 4 meanders and deforms.
JP 2001-292517 A

  The present invention has been invented in view of the above-described conventional problems, and it is possible to absorb the expansion of the cable rack at the connection portion with a simple configuration, and in addition, the construction can be performed in the connection structure that can absorb the expansion. It can be done easily and reliably, and both cable racks can be firmly connected via the connection fittings, so there is no need for a support member at the connection part, and there is no need to use a ground bond wire, thus reducing costs and construction. It is an object of the present invention to provide a cable rack connection structure that can be simplified.

In order to solve the above-described problem, the cable rack connection structure according to the present invention is configured such that both sides of the connection fitting 1 are the connection portions 2 and the positioning protrusions 3 are provided between the connection portions 2 of the connection fitting 1, Both cable racks 4 with the longitudinal ends of the cable racks 4 abutting on both sides of the positioning projections 3 of the connection fitting 1 and the ends of the cable racks 4 being in close contact with the connection portions 2 on both sides of the connection fitting 1 respectively. The bolts 7 are passed through the holes 5 and 6 provided in the connection portions 2 on both sides of the connection fitting 1 and fastened with nuts 8 to connect the cable racks 4 to the connection portions 2 on both sides. Among the bolts 7, one or both of the holes 5 of the cable rack 4 through which the bolts 7 on one side penetrate or the holes 6 of the connection portion 2 become long holes 9 in the longitudinal direction of the cable rack 4. It is those 4 of the tip of the cable racks 4 when the thermal expansion is constructed so as to be movable from the positioning position by the positioning projections 3 in the longitudinal direction of the cable racks 4, close to both sides of the connection portion 2 of the fitting 1 End portions of the two cable racks 4, the vertical piece portion 12, the lower horizontal piece portion 16 protruding from the lower end portion of the vertical piece portion 12, and the upper horizontal piece portion 17 protruding from the upper end portion of the vertical piece portion 12, The lower horizontal piece portions 16 of the cable racks 4 are in contact with both end surfaces of the positioning projections 3 of the connection bracket 1 so that the cable racks 4 are thermally expanded and positioned at the front ends of the cable racks 4. The one part 16 is configured so as to ride on the positioning protrusion 3 .

In this way, by making the tips of both cable racks 4 abut on both sides of the positioning projections 3 of the connection fitting 1, it can be easily constructed so that a gap of a predetermined dimension is formed between the tips of both cable racks 4, When the cable rack 4 expands due to heat, the expansion can be absorbed by expanding along the long hole 9 and moving the distal end beyond the positioning position by the positioning projection 3 in the longitudinal direction of the cable rack 4. . The ends of both cable racks 4 and both ends of the connection fitting 1 can be firmly connected by fastening bolts 7 and nuts 8, and a support member is not necessarily required near the connection portion as in the prior art. In addition, since both the cable racks 4 are fastened with the bolts 7 and the nuts 8 in close contact with the connection portions 2 on both sides of the connection fitting 1, no earth bond wires are required as in the prior art. Further, when the cable rack 4 is thermally expanded, the cable rack 4 expands and rides on the positioning protrusion 3 to absorb the expansion.

  Further, it is preferable that the side surface of the positioning projection 3 is an inclined surface 3 a for the end of the cable rack 4 to ride up when the cable rack 4 is expanded.

  With such a configuration, when the cable rack 4 expands, the tip of the cable rack 4 rides on the positioning protrusion 3 along the inclined surface 3 a of the positioning protrusion 3 to absorb the expansion of the cable rack 4. .

  In the present invention, since the connection fitting is provided with positioning protrusions, a gap with a predetermined dimension is easily and reliably formed between the ends of both cable racks by abutting the ends of the cable racks on both sides with both ends of the positioning protrusions. It can be constructed as is, and the construction is simplified. In addition, since the tip of the cable rack can be moved in the longitudinal direction of the cable rack from the positioning position by the positioning projection during the thermal expansion of the cable rack, the thermal expansion can be absorbed by the connecting bracket portion. Can prevent meandering and deformation of the cable rack. In addition, since the bolts and nuts are fastened in close contact with both ends of the cable racks and both ends of the connection fitting, the connection becomes strong, and a support member is not necessarily required near the connection part as in the past. Construction is simplified and the cost is reduced, and both cable racks are fastened with bolts and nuts in close contact with the connection parts on both sides of the connection bracket, so there is no need for an earth bond wire as in the past, In this respect, the cost can be further reduced and the construction can be simplified.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  The cable rack 4 is made of iron, and is constructed by installing a large number of small beams 11 between a pair of long main beams 10.

  The main girder 10 is made of iron, and projects the lower horizontal piece 13 toward the inside over the entire length of the lower end of the vertical piece 12 and the upper horizontal piece 14 toward the inside over the entire length of the upper end of the vertical piece 12. Protrusively configured.

  A small girder 11 is erected between the lower portions of the opposing parent girder 10.

  One or more connecting holes 5 are provided at the longitudinal end portion of the vertical piece 12 of the main beam 10 (in the case of providing a plurality, a plurality of holes 5 are provided at predetermined intervals in the longitudinal direction). 5 is a square hole.

  The connection fitting 1 is made of iron and has a shape overlapping with the outer surface or the inner surface of the main beam 10. The lower horizontal piece 16 projects inward at the lower end of the vertical piece 15 and the upper end of the vertical piece 15. The upper horizontal piece 17 protrudes inward from the part.

  Both sides (that is, one side half and the other side half) of the connection fitting 1 are connection portions 2, and the positioning projection 3 is formed at the boundary between the connection portions 2 on the inner surface or the outer surface of the connection fitting 1. Projected. In the embodiment shown in FIG. 5A, an example in which the positioning protrusion 3 is provided on the lower horizontal piece 16 (the upper surface which is the inner surface of the lower horizontal piece 16) is shown. In the embodiment shown in FIG. The example which provided the positioning protrusion 3 in the vertical piece 15 (inner surface of the vertical piece 15) is shown.

  As described later, the positioning protrusions 3 contact the ends of both the cable racks 4 by contacting the ends of both the cable racks 4 on both sides of the positioning protrusions 3 when connecting the two cable racks 4 using the connection fitting 1 as will be described later. The cable rack 4 serves to position the cable rack 4 and the connection fitting 1 so that a gap S of a predetermined dimension can be formed in the cable rack 4. The positioning projection 3 is positioned in contact with both sides of the positioning projection 3, and at the same time, the positioning projection 3 is connected to the tip of the cable rack 4 when the cable rack 4 is thermally expanded. Is configured to be able to ride on the positioning projection 3.

  In configuring the cable rack 4 so that the tip of the cable rack 4 can climb over the positioning protrusion 3 when the cable rack 4 is thermally expanded, for example, the protrusion length of the positioning protrusion 3 is shortened (the cable rack 4 When the cable rack 4 is thermally expanded, the projection length of the positioning protrusion 3 can be made shorter when the cable rack 4 is thermally expanded. The inclined surface 3a is used so that the end of the cable rack 4 can ride when the cable rack 4 is thermally expanded. By setting the cross-sectional shape of the positioning projection 3 to be a chevron shape or an arc shape, both side surfaces of the positioning projection 3 can be inclined surfaces 3a. Good. Moreover, you may use together shortening the protrusion length of the positioning protrusion 3 as mentioned above, and making the side surface of the positioning protrusion 3 into the inclined surface 3a.

  One or a plurality of connection holes 6 are provided in each of the connection portions 2 of the connection fitting 1 (in the case where a plurality of connection holes 6 are provided, a plurality are provided at predetermined intervals in the same direction as the longitudinal direction of the cable rack 4). Although the hole 6 is a square hole, in the embodiment shown in the accompanying drawings, the hole 6 is a long hole 9 having a rectangular shape that is long in the longitudinal direction of the cable rack 4 as shown in FIGS. .

  The bolt 7 used in the present invention has a shaft portion 19 projecting from the head portion 18 as shown in FIGS. 3 and 4, and a square base 20 having a square shape is provided on the projecting base portion of the shaft portion 19. In addition, it has a full screw specification in which a male screw portion 21 is formed over the entire length of the shaft portion 19 excluding the square base portion 20.

  The cable rack 4 is supported by a support member. The cable racks 4 are connected using the connection fitting 1 in order to connect the cable racks 4 in a straight line in the longitudinal direction.

  When connecting the end portions in the longitudinal direction of the cable racks 4 via the connection fittings 1, the inner surfaces of the connection portions 2 on both sides of the connection fittings 1 are respectively connected to the outer surfaces of the end portions in the longitudinal direction of both the cable racks 4. The connection fittings 1 are overlapped so as to be in close contact. In this state, the end portions in the longitudinal direction of both cable racks 4 are brought into contact with both sides of the positioning projections 3 provided on the connection fitting 1, so that a gap S between the ends of both cable racks 4 is set to a predetermined value. The dimensions are set to 4 mm, for example.

  In this manner, the cable rack 4 is brought into close contact with the outer surface of the end portion in the longitudinal direction of the cable rack 4 and the tip end of the cable rack 4 is in contact with the side end of the positioning projection 3. Since the hole 5 of 4 and the hole 6 of the connecting portion 2 communicate with each other, the bolts 7 are passed through the communicating holes 5 and 6, and nuts 8 are screwed into the bolts 7 to be fastened. As a result, the cable rack 4 and the connection fitting 1 are firmly connected to each other by the bolts 7 and nuts 8 of the full screw specification.

  Therefore, compared with the conventional case where the connecting portion is connected with a bolt of a half screw specification, the connection strength becomes strong, and it is not necessary to support the vicinity of the connecting portion with the support member, and the support pitch by the support member is 1 to 1. It gets better at 3m. In addition, since the cable rack 4 and the connection fitting 1 are firmly connected in a close state, the iron cable rack 4 and the iron connection fitting 1 are fixed in an electrically connected state. Thus, it is not necessary to use a ground bond wire.

  As described above, the cable rack 4 is disposed in the tunnel, the common groove, or the factory, and the electric wire is laid in the cable rack 4.

  By the way, the cable rack 4 expands or contracts due to a change in heat in the environment in which the cable rack 4 is disposed. However, in the present invention, when the cable rack 4 expands due to heat, the connection portion by the bolt 7 is connected to the cable rack 4. The rack 4 expands while moving along the long hole 9, and the leading end of the cable rack 4 rides on the positioning projection 3 due to the expansion, so that the leading end of the cable rack 4 exceeds the positioning position by the positioning projection 3 and the cable rack 4. It is possible to absorb the thermal expansion by moving in the longitudinal direction.

  Further, when the cable rack 4 contracts, the cable rack 4 contracts while moving along the long hole 9 at the connection portion by the bolt 7, and the cable rack 4 moves away from the positioning projection 3 to absorb the thermal contraction. Will be able to.

  Therefore, even if the cable rack 4 expands and contracts due to heat, the cable rack 4 connected in the longitudinal direction via the connection fitting 1 can meander or be prevented from being deformed.

  In the embodiment shown in the accompanying drawings, an example is shown in which the holes 6 provided in the connecting portions provided on both sides of the connection fitting 1 are elongated holes 9, and both the cable racks 4 are connected when expanded and contracted, respectively. Although the example which climbs on both sides of the positioning projection 3 of the metal fitting 1 or is separated from the positioning projection 3 has been shown, one of the holes 6 provided in the connection portion 2 provided on both sides of the connection metal fitting 1 is connected. The hole 6 of the part 2 may be a long hole 9. In this case, the cable rack 4 connected by the bolt 7 using the hole 6 which is not the long hole 9 is in a state in which the connection fitting 1 is completely fixed to the end, and the cable rack 4 is expanded. When the connecting rack 1 performs the same movement as the contraction and the cable rack 4 connected by the bolt 7 using the hole 6 having the long hole 9 expands, the tip of the cable rack 4 is connected to the connecting bracket 1. The positioning projection 3 of the cable rack 4 is absorbed to absorb the expansion, and when the contraction is contracted, the end of the cable rack 4 connected by the bolt 7 using the hole 6 which is the long hole 9 is separated from the positioning projection 3. Can be absorbed.

  In the above-described embodiment, an example in which both or one of the holes 6 provided in the two connection portions 2 of the connection fitting 1 is used as the long hole 9 to absorb expansion and contraction is shown. Alternatively, the hole 5 provided in the one cable rack 4 or the hole 5 provided in one of the cable racks 4 may be formed as a long hole 9 to absorb expansion and contraction of the cable rack 4.

  In addition, both or one of the holes 6 provided in the two connection portions 2 of the connection fitting 1 is a long hole 9, and the hole 5 provided in both the cable racks 4 or the hole 5 provided in one of the cable racks 4 is a long hole. 9 may absorb the expansion and contraction of the cable rack 4.

  The positioning projection 3 may be formed by cutting and raising a part of the connection fitting 1. In this case, the positioning protrusions 3 on both sides in the cut and raised state are respectively brought into contact with the leading ends of the cable racks 4 to perform positioning, and a gap S having a predetermined dimension is formed between the leading ends of both the cable racks 4. When the cable rack 4 expands, the leading end of the cable rack 4 overlaps the positioning protrusion 3 while tilting the positioning protrusion 3 cut and raised (that is, climbs up), so that the leading end of the cable rack 4 is positioned by the positioning protrusion 3. The thermal expansion can be absorbed by moving in the longitudinal direction of the cable rack 4 beyond.

It is a perspective view of the present invention. It is an expansion perspective view of the connection part same as the above. It is an exploded perspective view same as the above. It is sectional drawing of a connection part same as the above. (A) (b) is a perspective view which shows each example of the connection metal fitting used for the same as the above. It is a perspective view which shows a prior art example. (A) is a perspective view of the expansion metal fitting used for the above, and (b) is a perspective view of a half screw specification bolt used for the above. It is a disassembled perspective view of the connection part of another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection metal fitting 2 Connection part 3 Positioning protrusion 3a Inclined surface 4 Cable rack 5 Hole 6 Hole 7 Bolt 8 Nut 9 Long hole

Claims (2)

Both sides of the connection bracket are connected to each other, and positioning protrusions are provided between the connection portions of the connection bracket, the longitudinal ends of both cable racks abut against both sides of the positioning protrusions of the connection bracket, and both cable racks. With the ends of the cable fittings in close contact with the connection parts on both sides of the connection bracket, bolts are passed through the holes provided in both cable racks and the connection parts on both sides of the connection bracket, respectively, and tightened with nuts. of the above both sides of the bolt for connecting the connection portion, one or both of the at least one side cable rack bolt through the hole to the connection portion of the hole becomes long elongated hole in the longitudinal direction of the cable racks, cable racks Constructed so that the tip of the cable rack can move in the longitudinal direction of the cable rack beyond the positioning position by the positioning projection during thermal expansion of the cable rack It is those with the ends of both cable racks that are close to both sides of the connection portion of the fitting, and a vertical piece portion, and a lower horizontal piece portion protruding from the lower end of the vertical piece portion, the upper end of the vertical piece portion The upper horizontal piece that protrudes from the upper and lower ends of the cable racks abuts the end faces of the lower horizontal piece of each cable rack on both sides of the positioning protrusions of the connection bracket, and is positioned at the end of the cable rack during thermal expansion of the cable rack. A structure for connecting a cable rack, wherein the lower horizontal piece is configured to ride on the positioning protrusion . 2. The cable rack connection structure according to claim 1, wherein a side surface of the positioning protrusion is an inclined surface on which the front end of the cable rack rides when the cable rack expands.

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