US20130228634A1 - Screw dowel for fastening rails - Google Patents

Screw dowel for fastening rails Download PDF

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Publication number
US20130228634A1
US20130228634A1 US13/825,147 US201113825147A US2013228634A1 US 20130228634 A1 US20130228634 A1 US 20130228634A1 US 201113825147 A US201113825147 A US 201113825147A US 2013228634 A1 US2013228634 A1 US 2013228634A1
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US
United States
Prior art keywords
screw anchor
cylindrical ring
screw
anchor according
plastic
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.)
Abandoned
Application number
US13/825,147
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English (en)
Inventor
Winfried Bosterling
Michael Harraß
Dierk Bressel
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.)
Vossloh Werke GmbH
Original Assignee
Vossloh Werke 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 Vossloh Werke GmbH filed Critical Vossloh Werke GmbH
Assigned to VOSSLOH WERKE GMBH reassignment VOSSLOH WERKE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOSTERLING, WINFRIED, BRESSEL, DIERK, HARRASS, MICHAEL
Publication of US20130228634A1 publication Critical patent/US20130228634A1/en
Abandoned 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
    • E01B9/00—Fastening rails on sleepers, or the like
    • E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
    • E01B9/04—Fastening on wooden or concrete sleepers or on masonry without clamp members
    • E01B9/14—Plugs, sleeves, thread linings, or other inserts for holes in sleepers
    • E01B9/18—Plugs, sleeves, thread linings, or other inserts for holes in sleepers for concrete sleepers

Definitions

  • the invention relates to a screw anchor for the concrete attachment in a railroad tie or non-ballasted track according to the preamble of claim 1 . Moreover, the invention relates to a railroad tie or non-ballasted track with at least one screw anchor according to the invention.
  • Screw anchors for the concrete attachment in a railroad tie are used in railway engineering for connecting rail to tie.
  • the rail attachment is connected to the tie by means of rail screws.
  • the screw anchors are often made of plastic and can be cast into a concrete tie or a non-ballasted track during manufacture.
  • One reason that the anchors are often made of plastic is because the rail screw must be electrically insulated from the tie and because plastic is a cheap flexible material which is simple to process and use.
  • a disadvantage resulting from this is that the screw anchors made of plastic often have different mechanical and physical properties from the surrounding material.
  • many plastics, and also the materials conventionally used as anchor material have an approximately 10-fold greater coefficient of thermal expansion than concrete. This can lead to disadvantages, particularly in concrete tie manufacture but also in later operation, as an anchor initially in form-fit contact with the concrete expands more than the surrounding concrete when the temperature rises so that pressure is exerted on the concrete. Cracks and fissures can occur around the anchor or radially if there are high thermal stresses.
  • the specific clamp system used e.g.
  • the object of the invention is to develop an anchor for the concrete attachment in a railroad tie or non-ballasted track, said anchor being characterized by a reduced build-up of stress in the surrounding concrete material.
  • the screw anchor according to the invention for the concrete attachment in a railroad tie or non-ballasted track is characterized in that it comprises a threaded section with external threads disposed on the exterior of the screw anchor and internal threads disposed on the interior of the screw anchor and further an upper partial section without external threads which is disposed in the installed state close to the anchor opening. It is further characterized in that it comprises two components made of different materials, namely a base body made of plastic and a cylindrical ring made of a steel material, which is attached to the base body in a form and/or force fit manner.
  • the screw anchor according to the invention has the advantage that, by virtue of the cylindrical ring made of a steel material, stresses arising from the expansion of the plastic are absorbed by this ring and thus cannot radiate into the concrete material. It is thereby achieved that fewer and smaller cracks occur in the concrete material, and the concrete tie thus achieves a longer service life. As a result, the advantageous properties of two materials are implemented in a hard/soft combination.
  • Such an anchor can be thereby produced that the cylindrical ring as an insertion part is inserted into an injection molding tool, which can be carried out in an automated manner, whereby plastic material can be injected in such a way that the ring externally surrounds the anchor.
  • a further preferred embodiment consists in the cylindrical ring extending with the base body in the installed position upwards into the region of a feed opening for a rail screw, but which is preferably covered by a plastic collar as component of the screw anchor.
  • the plastic collar is intended to cover the cross-section of the cylindrical ring and have a thickness of 3 to 5 mm. This ensures that adequate electrical insulation exists between the tie screw and the cylindrical ring and, in addition, corrosion of the steel is counteracted. This has the advantage that the greatest temperature fluctuations, which occur at the surface of the railroad tie or non-ballasted track, are best absorbed by a ring positioned in such a way.
  • the ring is attached in a form and/or force-fit manner to the base body of the anchor by an appropriate adjustment of the internal diameter.
  • a further preferred embodiment consists in that the ring has a wall thickness between 0.5 mm and 5 mm. This has the advantage that the ring is sufficiently thick to contain the expansion of the plastic material while being simultaneously sufficiently thin to be cost- and material-efficient.
  • the ring in the installed position extends downwards as far as the upper start of the external threads.
  • the lower plastic region with the external threads is used to secure the screw anchor in the concrete.
  • a further preferred embodiment consists in the coefficient of thermal expansion of the steel material of the cylindrical ring being at least 10 times less than that of the plastic material of the base body, which it surrounds. This has the advantage that when there are temperature fluctuations the steel ring expands only a little relative to the plastic, and the ring can thus fulfill its function to a particular degree, namely to prevent the expansion of the plastic material even at high temperatures; the linear coefficient of thermal expansion of the material of the cylindrical ring is preferably less than 3 ⁇ 10 ⁇ 5 l/K.
  • a further preferred embodiment consists in the coefficient of thermal expansion of the steel material being approximately equivalent to that of the concrete of the tie.
  • it has an advantageous effect that concrete and steel are then very similar in terms of their coefficient of thermal expansion and thus no stresses occur between these two materials when there are temperature fluctuations.
  • a screw anchor is preferred in which the steel material is characterized by a modulus of elasticity high enough and a hardness great enough that the cylindrical ring attached to the anchor is not expanded or only negligibly expanded by the expanding plastic of the base body when heated within the temperature range which occurs during normal use. Due to this high strength of the steel, pressure stresses between anchor and surrounding concrete are thus prevented.
  • the modulus of elasticity of the material of the cylindrical ring is maximum 150 GPa.
  • the screw anchor is characterized in that its external thread is a round thread.
  • a thread is advantageously distinguished by easy manufacturability and a high strength in the connection thus achieved with the concrete.
  • a round thread has proved to be very beneficial in terms of the force-fit in radial stresses between screw anchor and concrete material.
  • the screw anchor is characterized in that the cylindrical ring is thinly coated with plastic.
  • the steel material of the cylindrical ring is protected from external influences (e.g. rain) and thus corrosion, which has an advantageous effect on the long-term service life of the ring.
  • it is not visible from outside.
  • this ensures in addition that the anchor and the screw possibly contained therein are electrically insulated from the surrounding concrete, which is advantageous for ties which are to be used on electrified lines.
  • the aforesaid enveloping can be achieved in a simple manner in the injection molding method by over-molding.
  • a further preferred embodiment of the invention consists in a railroad tie or non-ballasted track being provided with at least one screw anchor according to any of the previous embodiments. This has the advantage that the railroad tie is characterized by an increased service life by virtue of the advantages already mentioned above.
  • FIG. 1 shows a cross-section of a first embodiment of a screw anchor according to the invention.
  • FIG. 2 is a second embodiment of a screw anchor according to the invention.
  • the screw anchor 10 represented in FIG. 1 consists of the base body 22 made of plastic material and is formed of an upper partial section 16 without external thread, a middle partial section 14 with external threads 18 disposed on the exterior of the screw anchor 10 and internal threads 28 disposed on the interior of the screw anchor and a lower partial section 12 .
  • the internal thread can also be executed as a round thread but can differ from the external thread 18 in terms of thread flank and thread pitch.
  • the upper partial section 16 is executed essentially in a cylindrical shape and constructed integrally with the thread section 14 as well as the lower partial section 12 .
  • Form-fit elements in the shape of ribs extending longitudinally to the screw anchor can be provided on the external circumference of the lower partial section 12 , said elements preventing or at least impeding the screw anchor from radially distorting relative to the surrounding concrete material after the concrete mass of the railroad tie or non-ballasted track has been cast around the screw anchor.
  • the screw anchor represented in FIG. 1 is provided with a cylindrical ring 20 made of a steel material, said screw anchor extending along the upper partial section 16 and terminating flush with the upper opening 26 . It consists of steel, although it can also consist of a different material characterized by a high modulus of elasticity and a coefficient of thermal expansion which is approximately equivalent to that of concrete.
  • the cylindrical ring 20 is connected to the base body 22 of the screw anchor through the upper partial section 16 of the base body 22 being injected into the cylindrical ring 20 .
  • the screw anchor is thus fabricated by the cylindrical ring being inserted into the injection mold and then the plastic material of the base body 22 being injected according to the mold represented in FIG. 1 .
  • the cylindrical ring thereby possesses a wall thickness between 0 . 5 mm and 5 mm so that, with low material input, sufficient strength is guaranteed to contain the expansion of the plastic material.
  • the cylindrical ring 20 in the installed position represented in the figure with a substantially vertical orientation of the longitudinal axis of the screw anchor terminates at the top flush with the upper partial section 16 of the base body.
  • the cylindrical ring 20 with the base body 22 is generally intended to reach into the region of the feed opening but be covered there by an insulating plastic collar 24 as a component of the anchor,
  • the plastic collar has a thickness of 3 to 5 mm.
  • the function of a plastic collar over the cylindrical ring consists in creating adequate electric insulation between a rail screw screwed in the anchor and the cylindrical ring. Furthermore, the plastic collar counteracts the corrosion in the ring.
  • FIG. 2 corresponds essentially to that according to FIG. 1 , which is why the reference numbers of this figure are adopted here, but differs by the addition of a coating of the steel ring in the form of the plastic collar 24 .
  • This coating is executed on the outer circumference of the entire steel ring and prevents the steel ring from coming into direct contact with the surroundings and thus corroding or creating an undesirable electrical contact between a screw screwed into the anchor and the railroad tie or non-ballasted track.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Connection Of Plates (AREA)
  • Bolts, Nuts, And Washers (AREA)
  • Road Paving Structures (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
US13/825,147 2010-09-21 2011-09-21 Screw dowel for fastening rails Abandoned US20130228634A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10177840.5 2010-09-21
EP10177840.5A EP2431520B1 (de) 2010-09-21 2010-09-21 Schraubdübel für Schienenbefestigung
PCT/EP2011/066399 WO2012038464A1 (de) 2010-09-21 2011-09-21 Schraubdübel für schienenbefestigung

Publications (1)

Publication Number Publication Date
US20130228634A1 true US20130228634A1 (en) 2013-09-05

Family

ID=43508807

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/825,147 Abandoned US20130228634A1 (en) 2010-09-21 2011-09-21 Screw dowel for fastening rails

Country Status (8)

Country Link
US (1) US20130228634A1 (zh)
EP (2) EP2431520B1 (zh)
CN (1) CN103314157A (zh)
AR (1) AR083067A1 (zh)
EA (1) EA201390416A1 (zh)
ES (1) ES2544261T3 (zh)
PL (1) PL2431520T3 (zh)
WO (1) WO2012038464A1 (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130056545A1 (en) * 2010-05-26 2013-03-07 Erik Danneberg Plastic screw anchor for securing a rail to a railroad tie
US20150211190A1 (en) * 2012-08-22 2015-07-30 Vossloh-Werke Gmbh Plastic Dowel for Fastening of a Rail and Combination of such a Plastic Dowel and a Rail Screw
US20210008462A1 (en) * 2018-01-04 2021-01-14 KidKraft, Inc. Play structure and play structure assembly methods
KR102307075B1 (ko) * 2020-11-26 2021-10-01 성화시스템챤넬(주) 전산볼트가 고정되어진 공동 콘크리트 블록 구조체 및 이의 앙카시공방법
US11306442B2 (en) * 2018-07-19 2022-04-19 Schwihag Ag Rail fastening system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012200462A1 (de) 2012-01-13 2013-07-18 Hilti Aktiengesellschaft Spreizanker
CN106151208A (zh) * 2016-06-29 2016-11-23 杭州斯泰新材料技术有限公司 一种化学栓及制造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5332153A (en) * 1991-12-09 1994-07-26 Hilti Aktiengesellschaft Sleeve for increasing retention value of a screw
US5738278A (en) * 1996-01-19 1998-04-14 Hilti Aktiengesellschaft Anchor sleeve for composite anchors and method of preparing corrosion-resistant anchorages
US20100127093A1 (en) * 2007-04-04 2010-05-27 Juan Vives Clavel Sheath for railway track fixings, procedure for replacing the sheath in a sleeper and tools for executing the procedure
US20120298765A1 (en) * 2009-12-09 2012-11-29 Vossloh Werke Gmbh Screw anchor for rail attachments
US8814058B2 (en) * 2010-05-26 2014-08-26 Schwihag Ag Plastic screw anchor for securing a rail to a railroad tie

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB961877A (zh) * 1900-01-01
GB865120A (en) * 1958-05-07 1961-04-12 Samuel Tippett Improvements relating to the holding down of rails on sleepers
GB961876A (en) * 1961-12-15 1964-06-24 Samuel Tippett Improvements relating to sleeves for use in holding down railway lines on sleepers
DE3622860A1 (de) * 1986-07-08 1988-01-28 Wayss & Freytag Ag Einbauteile aus kunststoff fuer betonschwellen
FR2677677B1 (fr) * 1991-06-17 1996-07-05 Urba Insert pour ancrage de fixation de traverses de chemin de fer.
CN2661748Y (zh) * 2003-01-23 2004-12-08 株洲时代新材料科技股份有限公司 混凝土轨枕用塑料套管
CN101058966A (zh) * 2006-04-21 2007-10-24 上海颉灏机械有限公司 一种混凝土岔枕用预埋套管及其螺旋壳体的制造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5332153A (en) * 1991-12-09 1994-07-26 Hilti Aktiengesellschaft Sleeve for increasing retention value of a screw
US5738278A (en) * 1996-01-19 1998-04-14 Hilti Aktiengesellschaft Anchor sleeve for composite anchors and method of preparing corrosion-resistant anchorages
US20100127093A1 (en) * 2007-04-04 2010-05-27 Juan Vives Clavel Sheath for railway track fixings, procedure for replacing the sheath in a sleeper and tools for executing the procedure
US20120298765A1 (en) * 2009-12-09 2012-11-29 Vossloh Werke Gmbh Screw anchor for rail attachments
US8840036B2 (en) * 2009-12-09 2014-09-23 Vossloh Werke Gmbh Screw anchor for rail attachments
US8814058B2 (en) * 2010-05-26 2014-08-26 Schwihag Ag Plastic screw anchor for securing a rail to a railroad tie

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130056545A1 (en) * 2010-05-26 2013-03-07 Erik Danneberg Plastic screw anchor for securing a rail to a railroad tie
US8814058B2 (en) * 2010-05-26 2014-08-26 Schwihag Ag Plastic screw anchor for securing a rail to a railroad tie
US20150211190A1 (en) * 2012-08-22 2015-07-30 Vossloh-Werke Gmbh Plastic Dowel for Fastening of a Rail and Combination of such a Plastic Dowel and a Rail Screw
US9945078B2 (en) * 2012-08-22 2018-04-17 Vossloh-Werke Gmbh Plastic dowel for fastening of a rail and combination of such a plastic dowel and a rail screw
US20210008462A1 (en) * 2018-01-04 2021-01-14 KidKraft, Inc. Play structure and play structure assembly methods
US11306442B2 (en) * 2018-07-19 2022-04-19 Schwihag Ag Rail fastening system
KR102307075B1 (ko) * 2020-11-26 2021-10-01 성화시스템챤넬(주) 전산볼트가 고정되어진 공동 콘크리트 블록 구조체 및 이의 앙카시공방법
KR20220073609A (ko) * 2020-11-26 2022-06-03 성화시스템챤넬(주) 전산볼트가 고정되어진 공동 콘크리트 블록 구조체
KR102460931B1 (ko) 2020-11-26 2022-10-31 성화시스템챤넬(주) 전산볼트가 고정되어진 공동 콘크리트 블록 구조체

Also Published As

Publication number Publication date
PL2431520T3 (pl) 2015-11-30
EP2619368A1 (de) 2013-07-31
EA201390416A1 (ru) 2013-08-30
EP2431520A1 (de) 2012-03-21
WO2012038464A1 (de) 2012-03-29
ES2544261T3 (es) 2015-08-28
CN103314157A (zh) 2013-09-18
EP2431520B1 (de) 2015-06-17
AR083067A1 (es) 2013-01-30

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VOSSLOH WERKE GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BOSTERLING, WINFRIED;HARRASS, MICHAEL;BRESSEL, DIERK;REEL/FRAME:030318/0171

Effective date: 20130418

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION