EP0143289A1 - Herzstück für Weichen oder Kreuzungen und Verfahren zur Herstellung eines solchen Herzstückes - Google Patents

Herzstück für Weichen oder Kreuzungen und Verfahren zur Herstellung eines solchen Herzstückes Download PDF

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Publication number
EP0143289A1
EP0143289A1 EP84112124A EP84112124A EP0143289A1 EP 0143289 A1 EP0143289 A1 EP 0143289A1 EP 84112124 A EP84112124 A EP 84112124A EP 84112124 A EP84112124 A EP 84112124A EP 0143289 A1 EP0143289 A1 EP 0143289A1
Authority
EP
European Patent Office
Prior art keywords
frog
centerpiece
recess
insert
tip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP84112124A
Other languages
German (de)
English (en)
French (fr)
Inventor
Heinrich Bosshammer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schreck Mieves GmbH
Original Assignee
Schreck Mieves GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schreck Mieves GmbH filed Critical Schreck Mieves GmbH
Publication of EP0143289A1 publication Critical patent/EP0143289A1/de
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B7/00—Switches; Crossings
    • E01B7/10—Frogs
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B7/00—Switches; Crossings
    • E01B7/10—Frogs
    • E01B7/12—Fixed frogs made of one part or composite

Definitions

  • the invention relates to a centerpiece for switches or crossings, consisting essentially of conventional, weldable rail steel, with two wing rails and a centerpiece tip arranged between the wing rails and widening from an initial region to an end region, the centerpiece tip with the wing rails being two acute angles to one another - And guide grooves forms, connecting rails can be welded on the one hand to free ends of the wing rails, and on the other hand to the end region of the frog tip, and in the area of greatest wear, in particular in the beginning region of the frog tip, equipment with high manganese steel is provided.
  • the invention also relates to a method for producing such a centerpiece.
  • the known centerpiece from which the invention is based (cf. DE-AS 20 42 488), consists of three parts, namely two wing rails and the centerpiece tip. These three parts are welded together into a manageable core.
  • This core is made of common, weldable rail steel.
  • this frog is provided with armor made of a manganese steel alloy in the wear area, namely in the beginning area of the frog tip and on the overflow edges of the adjacent wing rails.
  • This armor made of a manganese steel alloy is applied to the centerpiece tip and the corresponding areas of the wing rails by means of electron beam welding.
  • the centerpiece tip is designed as a part that is particularly susceptible to wear as a manganese-coated casting.
  • the centerpiece tip is screwed to the wing rails via connecting straps.
  • screw connections are not without problems in practice, since they can come loose in continuous operation, i. H. require constant monitoring and are also relatively prone to repair.
  • a core piece for switches or crossings which is produced entirely as a one-piece casting, is known (see DE-AS 12 42 252), which consists of a central area (wear area) made of high-manganese steel, front end areas made of a weldable rail steel and between the central area and the End regions formed, mixing zones produced by a composite casting process. It has been shown that this core is not optimal in operation and that the process for its production as a composite casting process is extremely complex.
  • the invention is based on the object of specifying a centerpiece of the type described at the outset, which combines the advantages of the known centerpieces explained above in terms of production technology and application technology, in which case welded connections with connecting rails can be produced without any problems and nevertheless an optimal wear-free design of the wear area is possible.
  • the object of the invention is also to provide of a method for producing such a core.
  • the centerpiece according to the invention in which the above-mentioned object is achieved, is initially characterized in that the wing rails and the centerpiece tip are formed with one another as a one-piece centerpiece block made of customary, weldable rail steel, that the centerpiece block is in the area of greatest wear, in particular in the beginning area of the Frog tip, has a recess and that a frog insert made of high manganese steel is firmly inserted into the recess.
  • the production of such a frog block which includes the wing rails and the frog tip, is easily possible with modern manufacturing methods.
  • the frog insert made of manganese steel is embodied as a separate part.
  • the centerpiece insert itself can also be easily manufactured as an independent part.
  • the connection of the frog insert to the frog block can be realized permanently and robustly because of the shape of the embedding of the frog insert in a recess in the frog block.
  • the heart of the invention can be easily welded to connecting rails. Nevertheless, the wear area of the centerpiece can also be easily produced from the preferred manganese steel. All the advantages of the known frogs explained at the outset are combined in the frog according to the invention.
  • the centerpiece insert of the centerpiece in such a way that it encompasses both the start region of the centerpiece tip and the adjacent upper run regions of the wing rails.
  • the centerpiece insert there are of course between the centerpiece tip and the wing rails formed the driving and guide grooves explained above.
  • the frog insert is made in several parts.
  • the centerpiece insert is then inserted into the recess from above and held in this recess in some way. How this can be done in detail will be explained in more detail later.
  • a second possibility is characterized in that the recess in the frog block is open at the top and on one long side and that the frog insert can be inserted into the recess in the frog block from the open long side.
  • a third possibility is characterized in that the recess in the frog block is open at the top and on both long sides, that is to say represents a channel running transversely to the direction of extension of the frog.
  • the recess has undercuts on the edge, in particular trapezoidal in cross section is formed, and that the frog insert the edge Has undercuts corresponding formations, in particular is correspondingly trapezoidal in cross section.
  • the second possibility with an opening open at the top and only on one long side such undercuts can be provided on the three other sides
  • such undercuts can only be provided on the two remaining end faces can. In any case, these undercuts prevent the centerpiece insert from being removed upward from the recess.
  • a clear insertion path can also be specified in the previously explained third possibility, namely by the sides of the crosswise to the direction of extension of the centerpiece Recess (or the centerpiece insert) are not arranged exactly parallel to each other.
  • an embodiment of the frog according to the invention is recommended, which is characterized in that the frog block is provided with threaded bores in the region of the recess and the frog insert is provided with push-through holes which are aligned with the threaded bores when the frog insert is inserted into the recess, and that fitting screws are provided through the push-through holes can be inserted and screwed into the threaded holes.
  • the centerpiece insert To do the screw To bind the connections or the fitting screws of the screw connections in an area that is not problematic from an operational point of view, it is advisable to provide the centerpiece insert with a gradation in the area of the screw connections.
  • the frog insert can be firmly connected to the frog block by being held in the press fit in the recess.
  • a configuration of the frog according to the invention is recommended, which is characterized in that the wing rails are provided in the region of the connecting rails welded to the end region of the frog tip.
  • the wheel control arms are expediently attached to wheel handlebar stands which are known per se and which do not need to be explained further here.
  • the frog insert In order to make the upper run area of wing rails and frog tip particularly easy to drive, the frog insert should have a trapezoidal shape in plan view on both end faces.
  • the centerpiece according to the invention it is also advisable to design the centerpiece according to the invention in such a way that the centerpiece tip rises in a concave-arc shape in the initial region from the level of the bottom of the driving and guide grooves to a level slightly below the treads of the wing rails and then to the level of Treads of the wing rails is just rising.
  • the load of an overflowing wheel is only fully transferred to the frog tip when its width is sufficiently large.
  • the subject matter of the invention is also a method for producing a heart of the type in question.
  • the method according to the invention is characterized in that the heart Piece block from a cast, forged or rolled starting block by shaping the wing rails, the driving and guide grooves, the centerpiece tip, the end areas for welding the connecting rails and the recess for the centerpiece insert and the centerpiece insert with wing rails, driving and guide grooves and centerpiece tip made of manganese hard steel is finished pouring.
  • These process steps take into account the fact that the necessary driving and guiding grooves, etc., can be produced with precision and inexpensively in the forged centerpiece block, for example, on modern machine tools, while a casting method made of wear-resistant manganese steel is more expedient for the centerpiece insert.
  • a special embodiment of a method according to the invention for the production of a frog is recommended, in which the frog insert is held in the recess in the frog block in a press fit, which is characterized in that the frog insert is manufactured with external dimensions that are normal operating temperatures to be expected are slightly larger than the dimensions of the recess in the frog block, that before inserting the frog insert into the recess in the frog block, the frog insert to a temperature that is very low compared to the normal temperature during operation and / or the frog block to a temperature that is high compared to the normal temperature during operation is brought and that the frog insert is then inserted into the recess in the frog block.
  • the frog insert is held in the recess in the frog block in a press fit, which is characterized in that the frog insert is manufactured with external dimensions that are normal operating temperatures to be expected are slightly larger than the dimensions of the recess in the frog block, that before insert
  • the centerpiece consists essentially of customary, weldable rail steel and has two wing rails 1 and a centerpiece tip 4 which is arranged between the wing rails 1 and widens from an initial region 2 to an end region 3.
  • the centerpiece tip 4 forms with the wing rails 1 two driving and guide grooves 5 which run at an acute angle to one another.
  • connecting rails 6 are weldable or welded in the exemplary embodiment shown.
  • equipment with high manganese steel is provided, as will be explained below.
  • the wing rails 1 and the frog tip 4 are designed together as a one-piece frog block 7 made of conventional, weldable rail steel.
  • the frog block 7 has a recess 8 in the area of greatest wear, into which a frog insert 9 made of high manganese steel is firmly inserted. This is particularly clear from FIG. 1 in conjunction with FIG. 2.
  • the frog insert 9 comprises both the initial region 2 of the frog tip 4 and also adjacent overflow regions 10 of the wing rails 1.
  • the recess 8 in the frog block 7 is designed as a trough which is only open at the top. This is shown particularly clearly in FIG. 3. 3 shows the driving and guide grooves 5 particularly well.
  • the recess 8 is designed as a trough which is only open at the top
  • the recess 8 in the frog block 7 is open at the top and on one long side, so that the frog insert 9 is from the open long side can be inserted into the recess 8 in the frog block 7.
  • the recess 8 in the frog block 7 is open at the top and on both longitudinal sides, thus forming a channel running transversely to the direction of extension of the frog.
  • the recess 8 in the second and third exemplary embodiment of a centerpiece according to the invention has undercuts 11, namely is trapezoidal in cross section.
  • the centerpiece insert 9 is provided on the edge side with the undercuts 11 corresponding formations 12, namely also correspondingly trapezoidal in cross section.
  • 7 screw connections 13 are provided for connecting the centerpiece insert 9 to the centerpiece block.
  • 7 and 11 show that the frog block 7 is provided in the region of the recess 8 with threaded holes 14 and the frog insert 9 is provided with through holes 15 aligned with the threaded holes 14 when the frog insert 9 is inserted into the recess 8, and that fit screws 16 are provided by the Push-through bores 15 can be pushed through and screwed into the threaded bores 14.
  • the centerpiece insert 9 has a gradation 17 or gradations 17 in the area of the screw connections 13 or in the areas of the screw connections 13, as can be seen from FIGS. 7 and 11.
  • a special feature is that the frog insert 9 is held in the recess 8 in a press fit. This is achieved in that the frog insert 9 is produced with external dimensions that are slightly larger than the dimensions of the recess 8 in the frog block 7 at the temperatures that normally occur during operation, and that before the frog insert 9 is inserted into the recess 8, the frog insert 9 is brought to a temperature which is very low compared to the normal temperature during operation and is only then inserted into the recess 8 in the frog block 7. When warming up to the normal temperature during operation, the frog insert 9 expands somewhat and wedges absolutely firmly in the recess 8 in the frog block 7.
  • the wing rails 1 extending wheel links 18 are arranged in the region of the connecting rails 6 welded to the end region 3 of the frog tip 4.
  • the wheel control arms 18 are attached to conventional wheel control arms 19.
  • 4, 8 and 12 show known fastenings 20 which engage on the rail foot so as to fasten the parts of the heart according to the invention to a rail support plate 21 or the like.
  • FIG. 1 finally shows a particularly preferred embodiment of a frog according to the invention when the frog insert 9 has a trapezoidal shape in plan view on both end faces. This is particularly convenient.
  • the shape of the centerpiece tip 4 which rises in a concave-arc shape from the level of the bottom of the driving and guide grooves 5 to a level slightly below the running surfaces of the wing rails 1, is also visible in FIGS. 2, 6 and 10 then only rises to the level of the tread of the wing rails 1.
  • a uniform block width for frog blocks 7 of frogs allows the use of uniform rib plates for these frog blocks 7. Furthermore, it is of course easily possible to design frog blocks 7 for use with curved switches in a corresponding curved shape. At intersections, double frogs can also be designed with uniform frog blocks 7 in the manner explained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Heat Treatment Of Articles (AREA)
  • Prostheses (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
EP84112124A 1983-10-29 1984-10-10 Herzstück für Weichen oder Kreuzungen und Verfahren zur Herstellung eines solchen Herzstückes Ceased EP0143289A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833339442 DE3339442C1 (de) 1983-10-29 1983-10-29 Herzstueck fuer Weichen oder Kreuzungen und Verfahren zur Herstellung eines solchen Herzstueckes
DE3339442 1983-10-29

Publications (1)

Publication Number Publication Date
EP0143289A1 true EP0143289A1 (de) 1985-06-05

Family

ID=6213150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112124A Ceased EP0143289A1 (de) 1983-10-29 1984-10-10 Herzstück für Weichen oder Kreuzungen und Verfahren zur Herstellung eines solchen Herzstückes

Country Status (3)

Country Link
EP (1) EP0143289A1 (sv)
DE (1) DE3339442C1 (sv)
FI (1) FI79159C (sv)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2637920A1 (fr) * 1988-10-14 1990-04-20 Cogifer Procede de fabrication d'un coeur de croisement a pointe mobile et coeur de croisement ainsi obtenu
EP0365450A1 (fr) * 1988-10-14 1990-04-25 Cogifer (Cie Generale D'installations Ferroviaires), S.A. Coeur de croisement à pointe mobile et procédé de fabrication d'un tel coeur de croisement
WO1997041305A1 (es) * 1996-04-29 1997-11-06 Jez Sistemas Ferroviarios, S.L. Cruzamiento agudo de punta movil para ferrocarril
EP1020562A1 (fr) * 1999-01-15 2000-07-19 Comagep Coeur de croisement à pointe mobile et procédé de fabrication d'un tel coeur de croisement
EP2103738A2 (en) * 2008-03-18 2009-09-23 DT-Vyhybkárna a strojírna, a.s. Frog
CN103741563A (zh) * 2013-12-31 2014-04-23 中铁山桥集团有限公司 一种尖端加厚的固定型锐角辙叉心轨
AT14064U1 (de) * 2013-06-27 2015-03-15 Voestalpine Weichensysteme Gmbh Doppelherzstück für Gleiskreuzungen
CN104975542A (zh) * 2015-01-13 2015-10-14 中铁宝桥集团有限公司 固定型辙叉车轮传动区翼轨缓冲结构
EP3312341A1 (de) * 2016-10-24 2018-04-25 voestalpine BWG GmbH Flügelschiene eines herzstücks sowie verfahren zum herstellen eines herzstücks
CN108774923A (zh) * 2018-08-23 2018-11-09 中铁宝桥集团有限公司 组合式高锰钢辙叉
CN109403162A (zh) * 2018-12-24 2019-03-01 中铁宝桥集团有限公司 一种组合辙叉叉心结构
CN109778602A (zh) * 2019-03-25 2019-05-21 中铁宝桥集团有限公司 一种有轨电车槽型辙叉及无缝化制造方法
CN110144768A (zh) * 2019-06-18 2019-08-20 中铁宝桥集团有限公司 一种防跳且可调的固定型组合辙叉
CN110725164A (zh) * 2019-11-18 2020-01-24 中铁宝桥集团有限公司 嵌入式固定型无缝高锰钢辙叉结构
CN111979848A (zh) * 2020-09-15 2020-11-24 中铁宝桥集团有限公司 加强型合金钢心轨组合锐角辙叉
CN114808560A (zh) * 2022-02-28 2022-07-29 中铁宝桥集团有限公司 一种局部可更换辙叉及更换方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004060419B3 (de) 2004-11-10 2006-05-24 Schreck-Mieves Gmbh Zweigniederlassung Dortmund Herzstück für Weichen
DE102005024441B4 (de) * 2005-05-10 2008-07-10 Schreck-Mieves Gmbh Herzstückblock
DE102011106385A1 (de) 2011-07-04 2013-01-10 Thyssenkrupp Gft Gleistechnik Gmbh Weichenanlagenbauteil
CN103696329B (zh) * 2013-12-31 2015-08-19 中铁山桥集团有限公司 一种固定型锐角辙叉翼轨
CN114318963B (zh) * 2021-12-17 2023-03-14 中铁宝桥集团有限公司 固定型组合辙叉

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE548749C (de) * 1929-05-31 1932-04-18 Ver Stahlwerke Ag Aus mehreren voneinander loesbaren Stuecken zusammengesetztes Herzstueck von Kreuzungen, Kreuzungsweichen u. dgl.
DE1222957B (de) * 1961-03-27 1966-08-18 Const J Kihn Atel Herzstueck fuer Weichen und Kreuzungen
DE1242252B (de) * 1965-04-24 1967-06-15 Kloeckner Werke Ag Gegossenes Herzstueck fuer Weichen und Verfahren zum Herstellen eines solchen Herzstueckes
DE1534005A1 (de) * 1965-05-26 1969-03-06 Paris & Outreau Acieries Herzstueck
DE2034076A1 (en) * 1970-07-09 1972-01-13 Schreck Mieves Kg Hard manganese steel - used in forming forg points on steel rails
DE2244902A1 (de) * 1971-09-29 1973-04-05 Sergio Rene Damy Herzstueck
DE2042488B2 (de) * 1970-08-27 1976-02-12 Heim, Armin, Dipl.-Ing., Kreuzungen (Schweiz) Verfahren zur panzerung der verschleissbereiche eines herzstueckes einer weiche
DE7904172U1 (de) * 1979-02-15 1980-01-03 Heinrich Krug Gmbh & Co, 4600 Dortmund Herzstueck fuer weichen und kreuzungen
DE8105454U1 (de) * 1981-02-26 1982-07-15 BWG Butzbacher Weichenbau GmbH, 6308 Butzbach "herzstueck"

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE548749C (de) * 1929-05-31 1932-04-18 Ver Stahlwerke Ag Aus mehreren voneinander loesbaren Stuecken zusammengesetztes Herzstueck von Kreuzungen, Kreuzungsweichen u. dgl.
DE1222957B (de) * 1961-03-27 1966-08-18 Const J Kihn Atel Herzstueck fuer Weichen und Kreuzungen
DE1242252B (de) * 1965-04-24 1967-06-15 Kloeckner Werke Ag Gegossenes Herzstueck fuer Weichen und Verfahren zum Herstellen eines solchen Herzstueckes
DE1534005A1 (de) * 1965-05-26 1969-03-06 Paris & Outreau Acieries Herzstueck
DE2034076A1 (en) * 1970-07-09 1972-01-13 Schreck Mieves Kg Hard manganese steel - used in forming forg points on steel rails
DE2042488B2 (de) * 1970-08-27 1976-02-12 Heim, Armin, Dipl.-Ing., Kreuzungen (Schweiz) Verfahren zur panzerung der verschleissbereiche eines herzstueckes einer weiche
DE2244902A1 (de) * 1971-09-29 1973-04-05 Sergio Rene Damy Herzstueck
DE7904172U1 (de) * 1979-02-15 1980-01-03 Heinrich Krug Gmbh & Co, 4600 Dortmund Herzstueck fuer weichen und kreuzungen
DE8105454U1 (de) * 1981-02-26 1982-07-15 BWG Butzbacher Weichenbau GmbH, 6308 Butzbach "herzstueck"

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2637920A1 (fr) * 1988-10-14 1990-04-20 Cogifer Procede de fabrication d'un coeur de croisement a pointe mobile et coeur de croisement ainsi obtenu
EP0365450A1 (fr) * 1988-10-14 1990-04-25 Cogifer (Cie Generale D'installations Ferroviaires), S.A. Coeur de croisement à pointe mobile et procédé de fabrication d'un tel coeur de croisement
US5082214A (en) * 1988-10-14 1992-01-21 Cogifer (Cie Generale D'installations Ferroviaires), S.A. Crossing frog with a moving point
WO1997041305A1 (es) * 1996-04-29 1997-11-06 Jez Sistemas Ferroviarios, S.L. Cruzamiento agudo de punta movil para ferrocarril
ES2137807A1 (es) * 1996-04-29 1999-12-16 Jez Sistemas Ferroviarios S L Cruzamiento agudo de punta movil para ferrocarril.
EP1020562A1 (fr) * 1999-01-15 2000-07-19 Comagep Coeur de croisement à pointe mobile et procédé de fabrication d'un tel coeur de croisement
FR2788535A1 (fr) * 1999-01-15 2000-07-21 Comagep Coeur de croisement a pointe mobile et procede de fabrication d'un tel coeur de croisement
EP2103738A2 (en) * 2008-03-18 2009-09-23 DT-Vyhybkárna a strojírna, a.s. Frog
EP2103738A3 (en) * 2008-03-18 2011-07-06 DT-Vyhybkárna a strojírna, a.s. Frog
AT14064U1 (de) * 2013-06-27 2015-03-15 Voestalpine Weichensysteme Gmbh Doppelherzstück für Gleiskreuzungen
CN103741563A (zh) * 2013-12-31 2014-04-23 中铁山桥集团有限公司 一种尖端加厚的固定型锐角辙叉心轨
CN103741563B (zh) * 2013-12-31 2015-09-23 中铁山桥集团有限公司 一种尖端加厚的固定型锐角辙叉心轨
CN104975542A (zh) * 2015-01-13 2015-10-14 中铁宝桥集团有限公司 固定型辙叉车轮传动区翼轨缓冲结构
EP3312341A1 (de) * 2016-10-24 2018-04-25 voestalpine BWG GmbH Flügelschiene eines herzstücks sowie verfahren zum herstellen eines herzstücks
CN107974877A (zh) * 2016-10-24 2018-05-01 奥钢联Bwg有限责任公司 岔心件的翼轨以及用于制造岔心件的方法
CN108774923A (zh) * 2018-08-23 2018-11-09 中铁宝桥集团有限公司 组合式高锰钢辙叉
CN109403162A (zh) * 2018-12-24 2019-03-01 中铁宝桥集团有限公司 一种组合辙叉叉心结构
CN109778602A (zh) * 2019-03-25 2019-05-21 中铁宝桥集团有限公司 一种有轨电车槽型辙叉及无缝化制造方法
CN110144768A (zh) * 2019-06-18 2019-08-20 中铁宝桥集团有限公司 一种防跳且可调的固定型组合辙叉
CN110144768B (zh) * 2019-06-18 2024-01-26 中铁宝桥集团有限公司 一种防跳且可调的固定型组合辙叉
CN110725164A (zh) * 2019-11-18 2020-01-24 中铁宝桥集团有限公司 嵌入式固定型无缝高锰钢辙叉结构
CN111979848A (zh) * 2020-09-15 2020-11-24 中铁宝桥集团有限公司 加强型合金钢心轨组合锐角辙叉
CN114808560A (zh) * 2022-02-28 2022-07-29 中铁宝桥集团有限公司 一种局部可更换辙叉及更换方法

Also Published As

Publication number Publication date
DE3339442C1 (de) 1985-05-02
FI79159C (sv) 1989-11-10
FI844214L (fi) 1985-04-30
FI844214A0 (fi) 1984-10-26
FI79159B (fi) 1989-07-31

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