JP5968730B2 - Joint structure of track departure prevention guard - Google Patents

Description

  The present invention can easily cope with expansion / contraction of a rail departure prevention guard (hereinafter, simply referred to as a departure prevention guard) accompanying the temperature expansion / contraction of a bridge girder, etc. The present invention relates to a joint structure for a departure prevention guard that can reliably prevent the occurrence of a mistake in the connecting portion of the guard material in the departure prevention guard at the time of derailment.

  Conventionally, various countermeasures have been proposed for minimizing the expansion of damage when a train derails during an earthquake or the like. One countermeasure is to install a departure prevention guard between a pair of rails. An example of the departure prevention guard will be described with reference to the drawings.

  FIG. 3 is a partial plan view showing the departure prevention guard installed on the slab track, and FIG. 4 is a schematic partial perspective view showing the slab track.

  First, the slab track will be described.

  As shown in FIGS. 3 and 4, the slab track is installed on a concrete roadbed 1 constructed along a bridge girder (not shown). The slab track includes a concrete slab 2 supported by the roadbed 1 and installed on the roadbed 1, and a pair of rails 4 laid on the concrete slab 2 via rail fasteners 3 (see FIG. 4). ing. The concrete slab 2 is composed of a large number of concrete slab pieces 5 arranged in a line. A concrete slab 2 for supporting a horizontal force acting on the concrete slab pieces 5 is provided on the roadbed 1 between the adjacent concrete slab pieces 5. A protrusion 1a is formed. A semicircular recess 5a is formed on the end surface of the adjacent concrete slab piece 5, and a half of the projection 1a is inserted into the recess 5a via a CA mortar, whereby a horizontal force acting on the concrete slab piece 5 is obtained. Is supporting.

  As shown in FIG. 3, the departure prevention guard 6 is installed on the concrete slab piece 5 between the pair of rails 4 in parallel with the rails 4. The departure prevention guard 6 includes a pair of guard members 7 arranged at intervals, and a plurality of guard member beams 8 fixed between the pair of guard members 7. Each of the guard member 7 and the guard member beam 8 is made of a square steel pipe and is firmly connected to each other by welding. The guard material 7 has substantially the same length as the concrete slab piece 5 and is connected to the guard material 7 of another adjacent concrete slab piece 5. A fixing portion 7a is formed inside the guard member 7, and the escape prevention guard 6 is made of a concrete slab piece by fastening the nut with an anchor bolt (not shown) embedded in the concrete slab piece 5 in the fixing portion 7a. 5 is fixed.

  According to the departure prevention guard 6 configured as described above, when a train derails due to an earthquake or the like, the traveling direction of the train is smoothly guided by the wheels 9 (see FIG. 3) hitting the guard material 7. As a result, it is possible to prevent the train from greatly deviating from the slab track.

  As described above, the departure prevention guard 6 has a function of preventing the train from greatly deviating from the slab track and minimizing the damage caused by the train derailment accident. However, in order to maximize this function, it is necessary to connect the guard members 7 of the adjacent departure prevention guards 6 to each other.

  The reason for connecting the guard members 7 will be described below.

  As shown in FIG. 5, if the guard member 7A and the guard member 7B are not connected, when a horizontal load is applied to the end of the guard member 7A when the train is derailed, the guard member 7A and the guard member 7B A difference in horizontal displacement, that is, a mistake occurs between the end portions, and the wheel 9 enters the wrong portion, and the guidance effect of the traveling direction of the train by the departure prevention guard 6 is significantly hindered.

  Therefore, it is necessary to connect the guard member 7A and the guard member 7B so as not to make a mistake. However, if the guard member 7A and the guard member 7B are directly connected via a connecting means including a connecting plate and a bolt, a viaduct is formed. In the upper slab track, an excessive load is applied to the projection 1a of the slab track due to the temperature expansion and contraction of the bridge girder, which may adversely affect the slab track.

  Therefore, the object of the present invention is to easily cope with the expansion / contraction of the departure prevention guard accompanying the temperature expansion / contraction of the bridge girder, etc., and to ensure the difference in the guard material connecting portion in the departure prevention guard when the train is derailed. It is an object of the present invention to provide a joint structure for a line departure prevention guard that can be prevented.

  The present invention has been made to achieve the above object, and is characterized by the following.

  The invention according to claim 1 is a joint structure of a line departure prevention guard, which is installed between a pair of rails and includes a pair of guard members and a guard member girder fixed between the pair of guard members. And a pair of joint plates arranged across the inner surfaces of the connection end portions of the pair of guard members, and at least one joint plate girder fixed between the pair of joint plates, The ends of the pair of joint plates on the upstream side in the train running direction and the guard material on the upstream side of the train running direction are not fixed, and the ends of the pair of joint plates on the downstream side in the train running direction The guard material on the downstream side in the train traveling direction is characterized by being fixed.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the guard material and the joint plate girder are each formed of a square steel pipe.

  According to the present invention, the following effects are brought about.

  (A) The end of the joint plate on the downstream side in the train travel direction (train receiving side) without fixing the end of the joint plate on the upstream side in the train travel direction (the train leaving side) and the guard material on the upstream side in the train travel direction By fixing the guard member on the downstream side in the train traveling direction, it is possible to easily cope with expansion and contraction of the departure prevention guard accompanying temperature expansion and contraction of the bridge girder. As a result, an excessive burden is placed on the protrusion of the slab track due to the temperature expansion and contraction of the bridge girder, and there is no possibility of adversely affecting the slab track.

  (B) At the time of derailment of the train, even if a horizontal load is applied to the connecting end of the guard material on the upstream side in the train traveling direction, the horizontal load is applied in the train traveling direction via the joint plate and the joint plate girder. Since it is transmitted to the guard material on the downstream side, a part of the horizontal load is borne by the guard material on the downstream side in the train traveling direction. As a result, the difference in horizontal displacement generated between the connecting end portions of the guard material due to the horizontal load is reduced, so that there is no mistake in the connecting portions of the guard material, and even if a mistake occurs, only a slight difference is required. Therefore, the function of the departure prevention guard such as preventing the train from greatly deviating from the slab track can be exhibited to the maximum.

  (C) By fixing the joint plate girder between the joint plates, the rigidity of the entire escape prevention guard is increased, so that the number of guard material girder connecting the pair of guard materials can be reduced.

It is a partial top view which shows the deviation prevention guard provided with the joint structure of this invention installed in the slab track | orbit. It is the elements on larger scale which show the joint structure part in FIG. It is a partial top view which shows the deviation prevention guard installed in the slab track | orbit. It is a general | schematic fragmentary perspective view which shows a slab track | orbit. It is explanatory drawing which a difference produces between the edge parts of a guard material.

  An embodiment of the joint structure for a line departure prevention guard according to the present invention will be described with reference to the drawings.

  FIG. 1 is a partial plan view showing a departure prevention guard provided with a joint structure of the present invention installed on a slab track, and FIG. 2 is a partially enlarged view showing a joint structure part in FIG.

  1 and 2, the same reference numerals as in FIGS. 3 and 4 denote the same items. That is, 1 is a concrete roadbed constructed along a bridge girder (not shown), and a slab track is installed on the roadbed 1. The slab track includes a concrete slab 2 supported by the roadbed 1 and installed on the roadbed 1, and a pair of rails 4 laid on the concrete slab 2 via rail fasteners 3. The concrete slab 2 is composed of a large number of concrete slab pieces 5 arranged in a line. A concrete slab 2 for supporting a horizontal force acting on the concrete slab pieces 5 is provided on the roadbed 1 between the adjacent concrete slab pieces 5. A protrusion 1a is formed. A semicircular recess 5 a is formed on the end surface of the adjacent concrete slab piece 5, and a half of the protrusion 1 a is inserted into the recess 5 a, thereby supporting the horizontal force acting on the concrete slab piece 5.

  Reference numeral 6 denotes a departure prevention guard, which is installed on the concrete slab piece 5 between the pair of rails 4 in parallel with the rails 4. The departure prevention guard 6 includes a pair of guard members 7 arranged at intervals and a plurality of guard member beams 8 fixed between the pair of guard members 7. Each of the guard member 7 and the guard member beam 8 is made of a square steel pipe and is firmly connected to each other by welding. The guard material 7 has substantially the same length as the concrete slab piece 5 and is connected to the guard material 7 of another adjacent concrete slab piece 5 via a joint structure of the present invention, which will be described later. A fixing portion 7a is formed inside the guard member 7, and the escape prevention guard 6 is made of a concrete slab piece by fastening the nut with an anchor bolt (not shown) embedded in the concrete slab piece 5 in the fixing portion 7a. 5 is fixed.

  Reference numeral 10 denotes the joint structure of the present invention, which connects the guard members 7 in the adjacent departure prevention guards 6. A joint structure 10 according to the present invention includes a pair of steel plate joint plates 11 arranged across the inner surfaces of the connecting end portions of the pair of guard members 7, and a joint plate girder 12 fixed between the pair of joint plates 11. It is made up of. The joint plate 11 is made of a steel plate. The joint plate girder 12 is made of a square steel pipe and is fixed to the upstream end of the joint plate 11 in the train traveling direction. The number of the joint plate beams 12 may be one as in this example, or may be a plurality. Note that the joint plate girder 12 may be fixed to a position (indicated by a two-dot chain line in FIG. 2) near the downstream end of the joint plate 11 in the train traveling direction.

  As shown in FIG. 2, the end of each pair of joint plates 11 on the upstream side in the train traveling direction and the guard member 7A on the upstream side in the train traveling direction can expand and contract the guard member 7 due to the temperature expansion and contraction of the bridge girder. And not fixed for. That is, the end of the joint plate 11 on the upstream side in the train traveling direction is free with respect to the guard material 7A. On the other hand, the end of the joint plate 11 on the downstream side in the train traveling direction is fixed to the guard member 7B on the downstream side in the train traveling direction by welding (W).

  In this way, the joint structure 10 that connects the guard members 7 in the departure prevention guard 6 includes a pair of steel plate joint plates 11 that are arranged across the inner surfaces of the connection end portions of the pair of guard members 7 and a pair of joints. The joint plate 11 is fixed between the plates 11, and the end of the joint plate 11 on the upstream side in the train traveling direction is free with respect to the guard member 7A. Is fixed to the guard material 7B on the upstream side in the train traveling direction, the following effects are brought about.

  (1) Since it is possible to easily cope with the expansion and contraction of the departure prevention guard due to the temperature expansion and contraction of the bridge girder, there is a possibility that an excessive burden is applied to the projection 1a of the slab track due to the temperature expansion and contraction of the bridge girder and the slab track may be adversely affected. Disappear.

  (2) At the time of derailment of the train, even if a horizontal load by the wheel 9 (see FIG. 1) acts on the connecting end portion of the guard material 7A on the upstream side in the train traveling direction, this horizontal load is applied to the joint plate 11 and the joint plate. Since it is transmitted to the guard member 7B on the downstream side in the train traveling direction via the beam member 12, a part of the horizontal load is borne by the guard member 7B on the downstream side in the train traveling direction. As a result, the difference in horizontal displacement generated between the connecting end portions of the guard material due to the horizontal load is reduced, so that there is no mistake in the connecting portion between the guard material 7A and the guard material 7B. Just a few. Therefore, the function of the departure prevention guard such as preventing the train from greatly deviating from the slab track can be exhibited to the maximum.

  (3) Since the rigidity of the entire escape prevention guard is increased by fixing the joint plate girder 12 between the joint plates 11, the number of guard material girder 8 fixed between the pair of guard members 7 is reduced. be able to.

1: Roadbed 1a: Protrusion 2: Concrete slab 3: Rail fastener 4: Rail 5: Concrete slab piece 5a: Recess 6: Deviation prevention guard 7: Guard material 7a: Fixing portion 7A: Guard material 7B on the upstream side in the train traveling direction : Guard material on the downstream side in the train traveling direction 8: Girder material for guard material 9: Wheel 10: Joint structure of the present invention 11: Joint plate 12: Girder material for joint plate

Claims (2)

  A joint structure of a line departure prevention guard, which is installed between a pair of rails and is composed of a pair of guard members and a guard member girder fixed between the pair of guard members, Each train of the pair of joint plates includes a pair of joint plates arranged over the inner surface of the connecting end portion and at least one joint plate girder fixed between the pair of joint plates. The end on the upstream side in the travel direction and the guard material on the upstream side in the train travel direction are not fixed, and the end on the downstream side in the train travel direction of each of the pair of joint plates and the guard on the downstream side in the train travel direction The material is a joint structure for a line departure prevention guard, characterized by being fixed.   The joint structure for a line departure prevention guard according to claim 1, wherein each of the guard material and the joint plate girder is made of a square steel pipe.

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