JP4281014B2 - Height limiter - Google Patents

Description

  The present invention relates to a height limiting device for preventing a vehicle from colliding with an elevated object that crosses a vehicle travel path at a predetermined height.

  For example, a height limiting device used at a construction site is generally provided between two upper ends of two columns 3 and 3 erected on both sides of a vehicle traveling path 2 as indicated by reference numeral 1 in FIG. It was a gate-type gate structure with an upper bar (pipe) 4 bridged. Such a height limiting device 1 is configured so that the upper bar 4 has a lower limit height than the elevated object 5 before the elevated object (here, overhead line) 5 that crosses the sky of the vehicle travel path 2. Installed. The upper bar 4 is often attached with a warning sign 6 such as a flag. In such a height restriction device 1, for example, when a dump truck that has forgotten to lower the loading platform, a backhoe that has forgotten to lower the arm, or a truck with a high load passes through the gate, it collides with the vehicle and the load and the upper bar 4 Will be damaged and the driver will be informed that the limit height has been exceeded.

  However, since there are many cases where large vibrations and noises are generated at the construction site, the driver often does not notice even if the upper bar 4 is destroyed. In addition, when a vehicle or a load contacts the upper bar 4 Because the driver's seat is passing through the gate, visual confirmation is not possible, and the vehicle 5 may continue to run and damage the elevated object 5.

  Therefore, for example, in Patent Document 1, the upper bar of the gate-type gate structure is changed to a linear member, and one end portion of the linear member is fixed to one strut, and the other end portion is connected to the other strut side. The height limiting device is connected to the limit switch mechanism, and the limit switch mechanism is operated by the tension generated in the linear member by contact with the vehicle to turn on the warning lamp. Further, in Patent Document 2, a detection unit (ultrasonic sensor) that detects an excessive vehicle height limit is disposed on an upper portion of a vehicle traveling path in front of a height-restricted portion (elevated object), A height limit that places a warning unit above the limit height position of the limited height limit and sends a detection signal of the detection unit to the warning unit to light the warning light when a vehicle exceeding the limit height enters. An apparatus is described. In these height restriction devices described in Patent Documents 1 and 2, since the driver is visually informed of the excess of the restricted height (abnormality) by a warning light, the risk of damaging the elevated structure is avoided. The

JP 2002-30623 A JP 7-26522 A

  However, according to the height limiting devices described in Patent Documents 1 and 2 described above, any abnormality is caused by visually informing the driver of an abnormality using an electric signal. In such a case, the function may be lost. Moreover, in addition to the need for various types of electrical equipment, troublesome wiring work and maintenance are required, so there is a problem that the cost burden is large, and in addition, removal and relocation are troublesome, and at construction sites etc. There was also a problem that it was inferior in convenience when used as a temporary facility.

  The present invention has been made in view of the above-mentioned conventional problems, and the problem is that the driver can be visually informed of an abnormality with a simple mechanism without relying on an electrical signal, Accordingly, it is an object of the present invention to provide a height limiting device that greatly contributes to improving the reliability of the device, reducing the cost burden, and improving convenience.

In order to solve the above-mentioned problems, the present invention provides two gate-type gates on a vehicle traveling path on the near side of an elevated object that traverses the sky, at a distance longer than the entire length of the vehicle, and on a side away from the elevated object The upper bar of the first gate-type gate is installed at a restricted height lower than the elevated structure, and the upper bar of the second gate-type gate closer to the elevated structure is the upper part of the first gate-type gate. Suspended and supported by a plurality of linear members extending from a bar and hung on a single bar bridged between the two struts on top of the two struts of the second gate-type gate The upper bar of the second gate-type gate is normally positioned above the limit height due to the tension of the linear member, and the upper bar of the first gate-type gate due to a collision with the vehicle or its load. There are those drops in response to loosening of the linear member when broken, further, the second portal As a stopper means for restricting the lowering height of the upper bar between one bar and the upper bar in the gate, a linear stopper member is folded, and the upper part of the first gate-type gate is folded. In order to prevent the upper bar in the second gate-type gate from hanging down when the bar breaks, it is interposed in a state of being bound with a binding tool .

  In the height limiting device configured as described above, when the upper bar of the first gate-type gate breaks due to the collision with the vehicle or its load, the linear member is loosened, and the linear member responds to the loosening of the linear member. As a result, the upper bar in the second gate-type gate descends, and the upper bar enters the visual sense of the driver of the vehicle, and the driver is informed of the abnormality.

In the present invention, the position where the linear member is hung is enlarged by one bar bridged between the two columns of the second gate-type gate, so that the upper bar of the second gate-type gate can be arbitrarily set. Can be of length. According to the present invention, when the upper bar, which is normally positioned at a level equal to or slightly higher than the limit height, falls, the lowering height of the upper bar is made substantially the same as the driver's line of sight by the stopper means. This ensures that the upper bar will be visible to the driver. Note that the stopper member is folded and bound with an appropriate binding tool to prevent the drooping. The bundling with this bundling tool is performed so that there is no hindrance to the sagging of the upper bar when the upper bar breaks. In addition, it is desirable to attach a warning sign such as a flag to the upper bar. In this case, the upper bar is more reliably recognized by the driver.

  The present invention does not particularly specify the place of application, but when applied to a construction site, the vehicle travel path is a temporary travel path in the construction site, and the elevated structure is an overhead line in the construction site. As a result, it is possible to prevent an overhead wire damage accident that occurs relatively frequently at the construction site.

  According to the height limiting device of the present invention, the driver can be visually informed of the abnormality without relying on an electrical signal, so there is no concern about loss of function due to failure of the electrical system and the reliability of the device is improved. To do. In addition, since it has a simple structure in which two gate-type gates are installed and connected between them by a linear member, the cost burden is greatly reduced as compared with the case where an electric signal is used. Moreover, since it has a simple structure, removal and relocation can be easily performed, improving convenience, and it is particularly suitable for application to a construction site or the like.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show a height limiting device according to one embodiment of the present invention. The present embodiment is applied to a construction site. In the figure, reference numeral 10 denotes a vehicle traveling path in the construction site, and 11 is an overhead line installed on the utility pole 12 so as to cross over the vehicle traveling path 10. (Elevated object) 13 represents a vehicle (dump truck) traveling on the vehicle travel path 10. The height restriction device 20 includes two gate-type gates 21 and 22 arranged on the vehicle traveling path 10 on the near side of the overhead wire 11 at intervals longer than the total length of the vehicle 13 and the two gate-type gates. A plurality (two in this case) of linear members 23, 23 bridged between the gates 21 and 22 are provided. The distance between the two gate-type gates 21 and 22 is preferably about 1.5 to 2.5 times the total length of the vehicle 13.

  Of the two gate-type gates described above, the first gate-type gate 21 on the side away from the overhead wire 11 includes two columns 24 and 24 that are erected on opposite sides of the vehicle traveling path 10. The upper bar 25 is bridged between the upper ends of the two columns 24, 24. The upper bar 25 is positioned so as to have a restricted height H (for example, H = 4 m) lower than the overhead wire 11, and both end portions thereof can be attached to and detached from the columns 24, 24 using appropriate fastening members. It is fixed to. Here, as the upper bar 25, a bar that is easily destroyed by a collision with the loading platform 13a of the vehicle 13 is selected. In this case, the material type, shape, dimensions and the like of the upper bar 25 are arbitrary, but it is desirable to use a wooden square member that is inexpensive in terms of cost. Further, the upper bar 25 is fixed to the support column 24 so as to break the linear member 23 in a direction in which it is surely loosened.

  On the other hand, the second gate-type gate 22 on the side close to the overhead line has two columns 26 and 26 erected opposite to both sides of the vehicle traveling path 10 and the upper ends of the two columns 26 and 26. A guide bar (guide member) 27 bridged between the two parts, and a movable bar (upper bar) 29 supported by the guide bar 27 via a linear stopper member (stopper means) 28. ing. Here, the guide bar 27 is positioned at a level higher than the limit height H (for example, H + 0.5 m), and both end portions thereof can be attached to and detached from the columns 26 and 26 using appropriate fastening members. It is fixed. The movable bar 29 is shorter than the guide bar 27 and is arranged away from the support column 26, and a plurality of warning signs (here, flags) 30 are attached thereto. Further, the linear stopper member 28 is set to have a maximum length so that the movable bar 29 can be suspended at a level lower than the limit height H (for example, H-1.5 m). The material type, shape, dimensions, and the like of the guide bar 27 and the movable bar 29 are arbitrary. As the guide bar 27, a steel pipe having a light weight and appropriate rigidity and a cylindrical outer peripheral surface is used. As the movable bar 29, it is desirable to use a member having an appropriate weight and rigidity. Moreover, you may make it attach a weight (weight) so that the linear member 23 may maintain appropriate tension | tensile_strength as needed.

  One end of each linear member 23 bridged between the first gate type gate 21 and the second gate type gate 22 is connected to a guide bar 25 in the first gate type gate 21. The other end of each linear member 23 is wound around a guide bar 27 in the second gate-type gate 22, and the movable bar 29 is connected to the other end. Thus, the length of each linear member 23 is set so that the movable bar 29 can be positioned at a level that is always equal to or slightly higher than the limit height H, whereby each linear member 23 is Always in tension. In this case, the linear stopper member 28 in the second gate-shaped gate 22 has a play, but here, the stopper member 28 is folded and bound with an appropriate binding tool, so that the sag is reduced. It is preventing. However, it is necessary to perform the binding with the binding tool so that the movable bar 29 does not hung when the guide bar 25 is broken.

Hereinafter, the operation of the height restriction device 20 will be described.
Now, as shown in FIG. 2, when the vehicle (dump truck) 13 that has finished carrying gravel etc. into the construction site enters the height limiting device 20 with its loading platform 13a raised, The loading platform 13a collides with the upper bar 25 installed at the restricted height H in the first gate-type gate 21, and thereby the upper bar 25 is destroyed. Then, as indicated by a two-dot chain line in FIG. 2, the linear member 23 is loosened, and the movable bar 29 in the second gate-type gate 22 is lowered accordingly. At this time, the linear stopper member 28 (FIG. 1) breaks and extends the binding tool, and the movable bar 29 descends to a level lower than the limit height H (here, 2.5 m high from the road surface). . By the way, when the loading platform 13a of the vehicle 13 destroys the upper bar 25 in the first gate-type gate 21, the driver's seat of the vehicle 13 passes through the first gate-type gate 21, and the driver There is a risk that the vehicle will continue to run without noticing the destruction of the upper bar 25. However, as described above, the loading platform 13a of the vehicle 13 destroys the upper bar 25 and, at the same time, the movable bar 29 in the front second gate-type gate 22 falls near the driver's line of sight. An abnormality is recognized and the vehicle 13 is stopped. Therefore, the vehicle 13 exceeding the limit height H does not travel as it is, and the overhead wire 11 is not damaged.

  As described above, in the height limiting device 20, the movable bar 29 having the sign 30 is mechanically dropped to visually notify the driver of the abnormality, so that the function is lost due to a failure as in the case of using an electric signal. Therefore, the reliability of the apparatus is improved. In addition, since the two gate-type gates 21 and 22 are simply installed and connected between them by the linear member 23, the installation cost is low and the maintenance is easy, so the cost burden is reduced. Moreover, in the construction site, the route of the vehicle travel path 10 and the overhead line 11 is often changed. However, since the height restriction device 20 can be easily removed or moved, the route change described above is performed. Can be easily accommodated.

  In the above-described embodiment, the guide bar (guide member) 27 is configured as one bar bridged by the two columns 26. However, the guide member is configured as a short bar and each column is independently supported. 26 may be supported.

  Further, in the above embodiment, the lowering height of the movable bar 29 is regulated by the linear stopper member 28 (stopper means), but this stopper means is optional, for example, the lower end of the movable bar 29 has a lower end. The upper end portion of the fixed rod may be inserted through the guide bar 27 and extended upward, and a stopper piece provided at the extended end portion may be used to prevent the rod from being removed. The linear stopper member 28 may be simply replaced with a spring member. However, this stopper means is not necessarily required. In this case, the movable bar 29 drops to an appropriate height according to the looseness of the linear member 23.

  Moreover, in the said embodiment, although the example applied as a damage countermeasure of the overhead wire 11 in a construction site was shown, the kind of elevated object which this invention makes object is arbitrary, for example, a railroad crossing in a public road, a viaduct, a bridge In addition to tunnels, various elevated objects in parking lots can be targeted.

It is a perspective view which shows the whole structure of the height restriction | limiting apparatus as one embodiment of this invention. It is a side view of the height limiting apparatus shown in FIG. It is a front view which shows the height limiting device of the conventional general gate type gate structure.

Explanation of symbols

10 Vehicle driving path 11 Overhead line (elevated object)
21 First Gate Gate 22 Second Gate Gate 23 Linear Member 24 First Gate Gate Support 25 Upper Bar of First Gate Gate 26 Second Gate Gate Support 27 Second Gate bar guide bar (guide member)
28 Linear stopper member (stopper means)
29 Movable bar (upper bar) of second gate type gate

Claims (3)

Two gate-type gates are arranged on the vehicle traveling path in front of the elevated object crossing the sky at intervals longer than the total length of the vehicle, and the upper bar of the first gate-type gate on the side farther from the elevated object is The upper bar of the second gate-type gate, which is installed at a restricted height lower than the elevated structure and is closer to the elevated structure, extends from the upper bar of the first gate-shaped gate, and the second on top of the two posts of the portal gate, two posts between is suspended supporting the plurality of linear member wound around the bridge has been one of the bar, the second top gate type gate The bar is always positioned above the limit height due to the tension of the linear member, and the linear member loosens when the upper bar of the first gate-type gate breaks due to a collision with the vehicle or its load. It is intended to fall in response to the further, with one bar and the upper bar in the second portal gate As a stopper means for regulating the lowering height of the upper bar between them, a linear stopper member is folded, and when the upper bar of the first gate type gate breaks, A height limiting device characterized in that it is interposed in a state of being bound with a binding tool so that there is no hindrance to the hanging of the upper bar .   2. The height limiting device according to claim 1, wherein a warning sign is attached to an upper bar in the second gate type gate. The height limiting device according to claim 1 or 2 , wherein the vehicle traveling path is a temporary traveling path in a construction site, and the elevated object is an overhead line in the construction site.

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