JP4549262B2 - Ladder sleeper with escape guard - Google Patents

Ladder sleeper with escape guard Download PDF

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JP4549262B2
JP4549262B2 JP2005253551A JP2005253551A JP4549262B2 JP 4549262 B2 JP4549262 B2 JP 4549262B2 JP 2005253551 A JP2005253551 A JP 2005253551A JP 2005253551 A JP2005253551 A JP 2005253551A JP 4549262 B2 JP4549262 B2 JP 4549262B2
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prevention guard
departure prevention
sleeper
longitudinal
rail
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JP2007063910A (en
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一 涌井
信之 松本
正道 曽我部
友義 中條
章 飯泉
基行 宮本
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Railway Technical Research Institute
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本発明は、特に逸脱防止ガードの付設によるマクラギの剛性増大を抑え、マクラギをバラスト道床やコンクリート路盤に直接支障なく敷設できるようにした逸脱防止ガード付きラダーマクラギに関するものである。 The present invention relates to a ladder sleeper with a departure prevention guard that suppresses an increase in the rigidity of sleepers, particularly due to the attachment of a departure prevention guard, so that the sleepers can be laid directly on a ballast roadbed or a concrete roadbed without any hindrance.

走行中の列車が地震などで脱線して対向列車と衝突したり、高架橋から転落するといった事態になれば、多くの負傷者がでて大惨事になることは容易に想像できることであり、新潟県中越地震における上越新幹線の列車脱線を契機に、走行中の列車の安全性が大きな課題になっている。   It is easy to imagine that if a running train derails due to an earthquake etc. and collides with an oncoming train or falls from a viaduct, many injured people will become catastrophic. As a result of the train derailment of the Joetsu Shinkansen in the Chuetsu Earthquake, the safety of running trains has become a major issue.

従来、列車の脱線を防止する方法として、マクラギに当該マクラギの上に敷設されたレールの内側または外側に沿って逸脱防止ガードを取り付ける方法が知られており、上越新幹線の列車脱線事故を受けて、特に注目されてきている。
特開2004−324245号公報 特開2004−324287号公報
Conventionally, as a method of preventing train derailment, there has been known a method of attaching a departure prevention guard to the sleeper along the inside or outside of the rail laid on the sleeper. Has been attracting particular attention.
JP 2004-324245 A JP 2004-324287 A

逸脱防止ガードは、一般に鋼材または鉄筋コンクリートによってマクラギと一体に形成されるため、逸脱防止ガードを備えたマクラギは逸脱防止ガードを有することで曲げ剛性が大きい。   Since the departure prevention guard is generally formed integrally with sleepers by steel or reinforced concrete, the sleepers provided with the departure prevention guard have a large bending rigidity by having the departure prevention guard.

このため、バラスト道床やコンクリート路盤に、特にラダーマクラギを敷設するに際して、軌きょうを持ち上げ、バラストの突き固めや冶具による整正を行う場合、マクラギの曲げ剛性が大き過ぎるとバラスト道床への変位・追従がほとんど無いか非常に小さいため、マクラギの敷設・整正が非常に困難になる等の課題があった。   For this reason, when laying ladder sleepers on the ballast roadbed and concrete roadbed, especially when lifting the rails and performing ballast tamping and leveling with jigs, if the bending stiffness of the sleepers is too large, displacement to the ballast roadbed Since there is little or very little follow-up, there have been problems such as making it difficult to lay and correct sleepers.

本発明は、以上の課題を解決するためになされたもので、特に逸脱防止ガードの付設によるマクラギの剛性増大を抑えて、マクラギをバラスト道床やコンクリート路盤にも支障なく敷設できるようにした逸脱防止ガード付きラダーマクラギを提供することを目的とする。 The present invention has been made to solve the above problems, in particular to suppress the increase in rigidity of the sleepers according to attach a departure prevention guard deviation preventing the sleepers have to be able to lay without hindrance to the ballast bed and concrete roadbed It aims to provide ladder sleepers with guards .

請求項1記載の逸脱防止ガード付きラダーマクラギは、平行に伸び、それぞれにレールが敷設された2本の縦梁と、当該縦梁間に設置された複数の繋ぎ梁とからなるラダーマクラギと、前記縦梁に前記レールの外側または内側に沿って前記レールの長手方向に連続して形成された逸脱防止ガードとからなり、前記逸脱防止ガードは前記レールの長手方向に所定間隔おきに形成された複数のスリットと、前記レールの長手方向に連続して挿通された線状部材と、前記各スリットに充填された弾性目地部材とを有し、前記線状部材は各スリットを貫通し、かつ前記線状部材の端部は引張力を吸収する弾性部材を介して定着されてなることを特徴とするものである。 The ladder sleeper with a departure prevention guard according to claim 1, wherein the ladder sleeper includes two vertical beams extending in parallel and each provided with a rail, and a plurality of connecting beams installed between the vertical beams, The vertical beam comprises a deviation prevention guard formed continuously in the longitudinal direction of the rail along the outer side or the inner side of the rail, and the deviation prevention guards are formed at a predetermined interval in the longitudinal direction of the rail. Each of the slits, a linear member inserted continuously in the longitudinal direction of the rail, and an elastic joint member filled in each slit, the linear member penetrating each slit, and the line The end of the shaped member is fixed through an elastic member that absorbs a tensile force .

請求項2記載の逸脱防止ガード付きラダーマクラギは、請求項1記載の逸脱防止ガード付きラダーマクラギにおいて、線状部材はアンボンドPC鋼材であることを特徴とするものである。 The ladder sleeper with a departure prevention guard according to claim 2 is the ladder sleeper with a departure prevention guard according to claim 1, wherein the linear member is an unbonded PC steel material.

請求項3記載の逸脱防止ガード付きラダーマクラギは、請求項1または2記載の逸脱防止ガード付きラダーマクラギにおいて、スリット内に露出したPC鋼材の露出部分にさや管を挿通するかグリースを塗着してなることを特徴とするものである。
The ladder sleeper with a departure prevention guard according to claim 3 is the ladder sleeper with a departure prevention guard according to claim 1 or 2 , wherein a sheath pipe is inserted into the exposed portion of the PC steel material exposed in the slit or grease is applied. be Te is characterized in.

ラダーマクラギは、2本の縦梁と複数の繋梁とから梯子状に構成されていて、一般に剛性が大きい。そのため、鋼材などからなる逸脱防止ガードを付設すると剛性がさらに大きくなって、バラスト道床やコンクリート路盤への変位・追従がほとんど無いか非常に小さくなるため、ラダーマクラギの敷設・整正が非常に困難になる。The ladder sleeper is constructed in a ladder shape from two vertical beams and a plurality of connecting beams, and generally has high rigidity. For this reason, if a departure prevention guard made of steel or the like is attached, the rigidity will be further increased, and there will be little or no displacement / following to the ballast roadbed or concrete roadbed, so it will be very difficult to lay and correct ladder sleepers. become.

しかし、本発明によれば、逸脱防止ガードに複数のスリットを所定間隔おきに形成して逸脱防止ガードの付設によるマクラギの剛性増大が抑えられているため、バラスト道床やコンクリート路盤への変位・追従が可能になり、ラダーマクラギの敷設・整正が非常に容易になる。However, according to the present invention, since a plurality of slits are formed in the departure prevention guard at predetermined intervals to prevent the increase in sleeper rigidity due to the attachment of the departure prevention guard, the displacement / following to the ballast roadbed or the concrete roadbed is suppressed. It becomes possible to lay and correct ladder sleepers very easily.

また、逸脱防止ガードにはPC鋼線やPC鋼より線などのPC鋼材、あるいはアラミド繊維などの新素材(FRP)からなる連続繊維補強材からなる線状部材が連続して挿通され、各スリット間が互いに連結されていることで、互いに協同して外力に抵抗することができるため、万一脱輪して車輪がスリット間に激しく当たったとしても、車輪をレールからそれ以上逸れることのないように確実に保持することができ、スリットを有することによる強度および機能の低下もない In addition, a linear member made of continuous fiber reinforcing material made of PC steel material such as PC steel wire or PC steel wire, or a new material (FRP) such as aramid fiber is continuously inserted into the escape prevention guard, and each slit Because they are connected to each other, they can cooperate with each other to resist external forces, so even if you remove the wheel and hit the wheel violently between the slits, the wheel will not deviate further from the rail. Thus, there is no decrease in strength and function due to the slits .

なお、マクラギ本体と逸脱防止ガードは、鉄筋コンクリートによって一体に形成されてもよいが、特に逸脱防止ガードのみを繊維補強コンクリートや超高強度コンクリートで形成してもよく、さらに逸脱防止ガードをマクラギ本体と別体に形成し、取付ボルト等による後付けとしてもよい。The sleeper body and the departure prevention guard may be integrally formed of reinforced concrete, but in particular, only the departure prevention guard may be formed of fiber reinforced concrete or ultra-high-strength concrete. It may be formed separately and retrofitted with mounting bolts or the like.

また、線状部材は、その全長にわたって逸脱防止ガードのコンクリートと付着させる場合と付着させない(アンボンド)場合のいずれの方式によって取り付けてもよく、後者のアンボンド方式とする場合、線状部材の両端部のみを逸脱防止ガードの端部に定着すればよい In addition, the linear member may be attached by either the method of adhering to the concrete of the escape prevention guard over the entire length or by the method of not adhering (unbonding). Only need to be fixed to the end of the departure prevention guard .

その際、端部にコイルバネや合成ゴム等の弾性部材を取り付けることによりPC鋼材に作用する張力を吸収できるようにすることもできる。線状部材にはPC鋼線、PC鋼より線、PCワイヤー等のPC鋼材、あるいはアラミド繊維などの新素材(FRP)からなる連続繊維補強材を用いることができ、また、これらの線状部材は必要に応じて複数挿通することもできる At that time, by attaching an elastic member such as a coil spring or synthetic rubber to the end portion, it is possible to absorb the tension acting on the PC steel material. For the linear members, PC steel wires, PC steel strands, PC steel materials such as PC wires, or continuous fiber reinforcements made of new materials (FRP) such as aramid fibers can be used, and these linear members can also be used. Can be inserted as needed .

各スリットに弾性目地部材を充填することによりPC鋼材の露出部分の腐蝕などを防止することができる。この場合の弾性目地部材には合成ゴムや合成樹脂などを用いることができる。 また、スリット内に露出したPC鋼材の露出部分に鋼管や樹脂管などからなるさや管を挿通したり、単にグリース等を塗着してもよい。By filling each slit with an elastic joint member, corrosion of the exposed portion of the PC steel material can be prevented. In this case, synthetic rubber, synthetic resin, or the like can be used for the elastic joint member. Further, a sheath pipe made of a steel pipe or a resin pipe may be inserted into the exposed portion of the PC steel material exposed in the slit, or grease or the like may be simply applied.

本発明は、マクラギに当該マクラギのレール敷設部の外側若しくは内側に逸脱防止ガードが設けられているため、列車の走行中の被害を未然に防止することができる。   According to the present invention, since the escape prevention guard is provided on the outer side or the inner side of the sleeper rail laying portion in the sleeper, it is possible to prevent damage during traveling of the train.

また、逸脱防止ガードに複数のスリットを設けることにより、逸脱防止ガードの付設によるマクラギの剛性増大を抑制することができるため、バラスト道床やコンクリート路盤への変位・追従が可能になり、マクラギの敷設・整正が非常に容易になる等の効果がある。   In addition, by providing a plurality of slits in the departure prevention guard, it is possible to suppress the increase in sleeper rigidity due to the attachment of the departure prevention guard, enabling displacement / follow-up to the ballast roadbed and concrete roadbed. -There are effects such as very easy correction.

図1と図2は、ラダーマクラギ本体と逸脱防止ガードとからなる逸脱防止ガード付きマクラギを示し、図において、ラダーマクラギ本体1は、平行に伸びる2本の縦梁1a,1aと、当該縦梁1a,1aの端部間とその内側間にそれぞれ架け渡された2本の端梁1bと、複数の繋ぎ梁1c,1cとから形成されている。   FIG. 1 and FIG. 2 show a sleeper with a departure prevention guard comprising a ladder sleeper body and a departure prevention guard. In the figure, a ladder sleeper body 1 includes two longitudinal beams 1a and 1a extending in parallel and the longitudinal beam. It is formed of two end beams 1b bridged between the end portions 1a and 1a and the inside thereof, and a plurality of connecting beams 1c and 1c.

縦梁1aと端梁1bは鉄筋コンクリートから一体的に形成され、縦梁1aにレール敷設部1dが形成され、両端の端梁1bは列車荷重に対する両端の反力受けとして形成されている。   The vertical beam 1a and the end beam 1b are integrally formed from reinforced concrete, a rail laying portion 1d is formed on the vertical beam 1a, and the end beams 1b at both ends are formed as reaction force receivers at both ends against the train load.

また、繋ぎ梁1cは鋼管などの鋼材から形成され、縦梁1b,1bの長手方向に所定間隔おきに架け渡され、各繋ぎ梁1cの両端は縦梁1aのコンクリート内に一体的に定着されている。   The connecting beam 1c is formed of a steel material such as a steel pipe, and is spanned at predetermined intervals in the longitudinal direction of the vertical beams 1b and 1b. Both ends of each connecting beam 1c are integrally fixed in the concrete of the vertical beam 1a. ing.

逸脱防止ガード2は、縦梁1a,1aのレール敷設部1dの外側(図1(a)参照)または内側(図1(b)参照)に鉄筋コンクリートによって縦梁1a,1aと一体に、かつ当該縦梁1a,1aの長手方向に連続して形成されている。   The departure prevention guard 2 is integrally formed with the longitudinal beams 1a and 1a by reinforced concrete on the outside (see FIG. 1 (a)) or inside (see FIG. 1 (b)) of the rail laying portion 1d of the longitudinal beams 1a and 1a. It is formed continuously in the longitudinal direction of the vertical beams 1a, 1a.

逸脱防止ガード2には当該逸脱防止ガード2の長手方向と直交する複数のスリット2aが、逸脱防止ガード2の長手方向に所定間隔おきに形成され、各スリット2aに合成ゴム等などからなる弾性目地部材3がそれぞれ充填されている。   The departure prevention guard 2 is formed with a plurality of slits 2a perpendicular to the longitudinal direction of the departure prevention guard 2 at predetermined intervals in the longitudinal direction of the departure prevention guard 2, and each slit 2a is an elastic joint made of synthetic rubber or the like. Each member 3 is filled.

なお、各スリット2aは、図示するように逸脱防止ガード2の上端部から中間部に渡って形成されていてもよく、あるいは逸脱防止ガード2の上端部から下端部に渡って逸脱防止ガード2を横断するように形成されていてもよい。   Each slit 2a may be formed from the upper end portion to the middle portion of the departure prevention guard 2 as shown, or the departure prevention guard 2 is extended from the upper end portion to the lower end portion of the departure prevention guard 2. You may form so that it may cross.

また、各逸脱防止ガード2には、PC鋼材4がアンボンド方式により逸脱防止ガード2の長手方向に連続して挿通され、各PC鋼材4の両端部4a,4aは、例えば図2(b)に図示するように逸脱防止ガード2の端部に支圧板5と定着ナット6等によってそれぞれ定着されている。また、支圧板5の裏側に合成ゴム等のクッション部材7が介在されている。   Moreover, the PC steel material 4 is continuously inserted in the longitudinal direction of the departure prevention guard 2 by the unbonding method in each departure prevention guard 2, and both ends 4a and 4a of each PC steel material 4 are shown in FIG. As shown in the figure, it is fixed to the end portion of the departure prevention guard 2 by a support plate 5 and a fixing nut 6 respectively. Further, a cushion member 7 such as a synthetic rubber is interposed on the back side of the bearing plate 5.

なお、この場合のPC鋼材4の端部4a、支圧板5、定着ナット6およびクッション部材7はコンクリート内に埋設されている。   In this case, the end 4a of the PC steel material 4, the bearing plate 5, the fixing nut 6 and the cushion member 7 are embedded in the concrete.

このような構成において、例えば図2(a)に図示するように縦梁1a,1aに当該縦梁1a,1aのレール敷設部1d,1dにそれぞれ敷設されたレール8,8の外側に逸脱防止ガード2,2がそれぞれ設けられているため、列車の走行中の列車被害を未然に防止することができる。   In such a configuration, for example, as shown in FIG. 2A, the vertical beams 1a and 1a are prevented from deviating outside the rails 8 and 8 respectively laid on the rail laying portions 1d and 1d of the vertical beams 1a and 1a. Since the guards 2 and 2 are provided, it is possible to prevent the train from being damaged while the train is running.

また、逸脱防止ガード2には複数のスリット2aが設けられていることで、逸脱防止ガード2の付設による縦梁1a,1aの剛性増大を抑制することができるため、敷設時のバラストの突き固めによる軌きょうの整正が可能であり、バラスト道床9にも支障なく設置することができる。   Further, since the departure prevention guard 2 is provided with a plurality of slits 2a, an increase in rigidity of the vertical beams 1a and 1a due to the attachment of the departure prevention guard 2 can be suppressed. It is possible to correct the rail by means of the above, and it can be installed on the ballast roadbed 9 without any trouble.

本発明に係るマクラギの逸脱防止ガード付は、逸脱防止ガードの付設によるマクラギの剛性増大を抑制できるため、バラスト道床やコンクリート路盤への変位・追従が可能になり、マクラギの敷設を容易に行うことができる。   The sleeper with the escape prevention guard according to the present invention can suppress the increase in the rigidity of the sleeper due to the attachment of the departure prevention guard, so that displacement / following to the ballast roadbed and concrete roadbed is possible, and the sleepers are easily laid. Can do.

逸脱防止ガード付きマクラギの一例を示し、(a)は縦梁のレール敷設部の外側に逸脱防止ガードを有する逸脱防止ガード付きマクラギの端部斜視図、(b)は縦梁のレール敷設部の内側に逸脱防止ガードを有する逸脱防止ガード付きマクラギの端部斜視図である。An example of a sleeper with a departure prevention guard is shown. (A) is an end perspective view of a sleeper with a departure prevention guard having a departure prevention guard on the outside of the rail laying portion of the vertical beam, It is an edge part perspective view of the sleeper with a departure prevention guard which has a departure prevention guard inside. (a)は、レールが敷設された状態を示す逸脱防止ガード付きマクラギの一部斜視図、(b)PC鋼材端部の定着部を示す断面図である。(A) is a partial perspective view of a sleeper with a departure prevention guard showing a state in which a rail is laid, and (b) is a cross-sectional view showing a fixing portion of a PC steel material end.

符号の説明Explanation of symbols

1 ラダーマクラギ本体
2 逸脱防止ガード
3 弾性目地部材
4 PC鋼材
5 支圧板
6 定着ナット
7 クッション部材(弾性部材)
8 レール
9 バラスト道床
DESCRIPTION OF SYMBOLS 1 Ladder sleeper main body 2 Deviation prevention guard 3 Elastic joint member 4 PC steel material 5 Supporting plate 6 Fixing nut 7 Cushion member (elastic member)
8 rails 9 ballast roadbed

Claims (3)

平行に伸び、それぞれにレールが敷設された2本の縦梁と、当該縦梁間に設置された複数の繋ぎ梁とからなるラダーマクラギと、前記縦梁に前記レールの外側または内側に沿って前記レールの長手方向に連続して形成された逸脱防止ガードとからなり、前記逸脱防止ガードは前記レールの長手方向に所定間隔おきに形成された複数のスリットと、前記レールの長手方向に連続して挿通された線状部材と、前記各スリットに充填された弾性目地部材とを有し、前記線状部材は各スリットを貫通し、かつ前記線状部材の端部は引張力を吸収する弾性部材を介して定着されてなることを特徴とする逸脱防止ガード付きラダーマクラギ。 A ladder sleeper composed of two longitudinal beams extending in parallel and each having a rail laid thereon, and a plurality of connecting beams installed between the longitudinal beams, and the longitudinal beam along the outer side or the inner side of the rail. The escape prevention guard is formed continuously in the longitudinal direction of the rail, and the departure prevention guard includes a plurality of slits formed at predetermined intervals in the longitudinal direction of the rail and the longitudinal direction of the rail. An elastic member having a linear member inserted therein and an elastic joint member filled in each slit, the linear member penetrating each slit, and an end portion of the linear member absorbing a tensile force Ladder sleeper with escape guard, characterized by being fixed through 線状部材はアンボンドPC鋼材であることを特徴とする請求項1記載の逸脱防止ガード付きラダーマクラギ。 The ladder sleeper with a departure prevention guard according to claim 1, wherein the linear member is an unbonded PC steel material. スリット内に露出したPC鋼材の露出部分にさや管を挿通するかグリースを塗着してなることを特徴とする請求項1または2記載の逸脱防止ガード付きラダーマクラギ。 3. A ladder sleeper with a escape prevention guard according to claim 1 , wherein a sheath pipe is inserted or grease is applied to the exposed portion of the PC steel material exposed in the slit .
JP2005253551A 2005-09-01 2005-09-01 Ladder sleeper with escape guard Expired - Fee Related JP4549262B2 (en)

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Publication number Priority date Publication date Assignee Title
JP4878353B2 (en) * 2008-03-31 2012-02-15 公益財団法人鉄道総合技術研究所 Sleepers with guards
CN102146643B (en) * 2010-02-05 2014-01-01 北京捷适中坤铁道技术有限公司 Longitudinal sleeper and damping railway system
JP5695990B2 (en) * 2011-07-07 2015-04-08 公益財団法人鉄道総合技術研究所 Guard for preventing departure from railway vehicles

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JPH0378812U (en) * 1989-12-02 1991-08-09
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JPH05306560A (en) * 1992-04-30 1993-11-19 Kumagai Gumi Co Ltd Unbonding treated frp tension material
JPH11182633A (en) * 1997-12-19 1999-07-06 Tokyo Seiko Co Ltd Cable tension adding device, and cable extending method
JPH11222823A (en) * 1998-02-10 1999-08-17 Toa Kogyo Kk Curved external facing panel and production thereof
JPH11247102A (en) * 1998-03-03 1999-09-14 Railway Technical Res Inst Joint construction in ladder-sleeper track
JP2000064506A (en) * 1998-08-19 2000-02-29 Takenaka Komuten Co Ltd Anchorage method of reinforcement
JP2000319983A (en) * 1999-05-14 2000-11-21 Toda Constr Co Ltd Joining structure of column and beam of reinforced concrete structure
JP2001214401A (en) * 2000-02-03 2001-08-07 Railway Technical Res Inst Ladder sleeper and railroad track
JP2004324287A (en) * 2003-04-25 2004-11-18 Odakyu Dentetsu Kk Structure and method for laying floating ladder track on steel bridge
JP2004538396A (en) * 2001-08-10 2004-12-24 マクス、ベグル、バウウンテルネームング、ゲゼルシャフト、ミット、ベシュレンクテル、ハフツング、ウント、コンパニー、コマンディトゲゼルシャフト Fixed track
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JP2005188181A (en) * 2003-12-26 2005-07-14 East Japan Railway Co Bridge girder support
JP2005188201A (en) * 2003-12-26 2005-07-14 Ps Mitsubishi Construction Co Ltd Expansion structure of track slab board on bridge girder

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JPH0270821A (en) * 1988-07-26 1990-03-09 Sanwa Doshitsu Kiso Kk Anchor tension member
JPH0378812U (en) * 1989-12-02 1991-08-09
JPH0469524U (en) * 1990-10-26 1992-06-19
JPH05306560A (en) * 1992-04-30 1993-11-19 Kumagai Gumi Co Ltd Unbonding treated frp tension material
JPH11182633A (en) * 1997-12-19 1999-07-06 Tokyo Seiko Co Ltd Cable tension adding device, and cable extending method
JPH11222823A (en) * 1998-02-10 1999-08-17 Toa Kogyo Kk Curved external facing panel and production thereof
JPH11247102A (en) * 1998-03-03 1999-09-14 Railway Technical Res Inst Joint construction in ladder-sleeper track
JP2000064506A (en) * 1998-08-19 2000-02-29 Takenaka Komuten Co Ltd Anchorage method of reinforcement
JP2000319983A (en) * 1999-05-14 2000-11-21 Toda Constr Co Ltd Joining structure of column and beam of reinforced concrete structure
JP2001214401A (en) * 2000-02-03 2001-08-07 Railway Technical Res Inst Ladder sleeper and railroad track
JP2004538396A (en) * 2001-08-10 2004-12-24 マクス、ベグル、バウウンテルネームング、ゲゼルシャフト、ミット、ベシュレンクテル、ハフツング、ウント、コンパニー、コマンディトゲゼルシャフト Fixed track
JP2004324287A (en) * 2003-04-25 2004-11-18 Odakyu Dentetsu Kk Structure and method for laying floating ladder track on steel bridge
JP2005163264A (en) * 2003-11-28 2005-06-23 Railway Technical Res Inst Track for rolling stock
JP2005188181A (en) * 2003-12-26 2005-07-14 East Japan Railway Co Bridge girder support
JP2005188201A (en) * 2003-12-26 2005-07-14 Ps Mitsubishi Construction Co Ltd Expansion structure of track slab board on bridge girder

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