KR100243969B1 - Method for manufacturing concrete sleeper - Google Patents

Method for manufacturing concrete sleeper Download PDF

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Publication number
KR100243969B1
KR100243969B1 KR1019970059103A KR19970059103A KR100243969B1 KR 100243969 B1 KR100243969 B1 KR 100243969B1 KR 1019970059103 A KR1019970059103 A KR 1019970059103A KR 19970059103 A KR19970059103 A KR 19970059103A KR 100243969 B1 KR100243969 B1 KR 100243969B1
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South Korea
Prior art keywords
mold
concrete
sleeper
sleepers
installing
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KR1019970059103A
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Korean (ko)
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KR19980019237A (en
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허규판
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허규태
주식회사삼성산업
신세현
주식회사삼성콘크리트
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Priority to KR1019970059103A priority Critical patent/KR100243969B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/247—Controlling the humidity during curing, setting or hardening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/245—Curing concrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
    • E01B3/28—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Abstract

본 발명은 콘크리이트 침목의 제조 방법에 관한 것으로서, 특히 금형의 내측에 복수 개의 와이어를 길이 방향으로 설치하고 숄더를 장착한 후 금형의 양 끝단에 격리판을 설치하는 공정과, 상기 금형의 내측에 콘크리이트를 투입하는 공정과, 상기 금형 내의 콘크리이트가 완전하게 양생되기 전에 격리판을 분리하는 공정과, 상기 금형의 상측에 설치된 천막으로 내측으로 고온의 증기를 공급하여 콘크리이트를 양생시키는 공정과, 양생된 침목 내의 와이어를 절단하고 금형으로부터 침목을 인출하여 적재하는 공정 및 상기 금형을 청소하고 내부 표면에 오일을 도포하는 공정을 포함한다.The present invention relates to a method of manufacturing a concrete sleeper, in particular, a process of installing a plurality of wires in the longitudinal direction inside the mold in the longitudinal direction and mounting the shoulders and installing separators at both ends of the mold, and inside the mold A step of putting concrete, a step of separating the separator before the concrete in the mold is completely cured, a step of curing the concrete by supplying high temperature steam to the tent installed above the mold; , Cutting the wire in the cured sleeper, taking the sleeper out of the mold and loading the sleeper, and cleaning the mold and applying oil to an inner surface thereof.

따라서, 본 발명에서는 일시에 많은 량의 침목을 제조하는 것이 가능하고, 침목의 내측에 복수 개의 강철 와이어가 매설되어 강성 및 내구성이 향상됨과 동시에 고온의 증기에 의해 콘크리이트의 양생이 균일하게 이루어짐으로써 강성이 더욱 향상되고 생산성이 증대됨과 동시에 코스트가 현저하게 절감된다.Therefore, in the present invention, it is possible to manufacture a large amount of sleepers at once, and a plurality of steel wires are embedded inside the sleepers, thereby improving rigidity and durability, and simultaneously curing the concrete by high temperature steam. The stiffness is further enhanced, the productivity is increased and the cost is significantly reduced.

Description

콘크리이트 침목의 제조 방법Method of making concrete sleepers

본 발명은 콘크리이트 침목의 제조 방법에 관한 것으로서, 보다 상세하게는 침목에 내측에 복수 개의 와이어를 매설하여 강성을 향상시킴과 동시에 일시에 많은 량의 침목을 제조하는 것이 가능하여 생산성을 현저하게 증대시킬 수 있는 콘크리이트 침목의 제조 방법에 관한 것이다.The present invention relates to a method for manufacturing concrete sleepers, and more particularly, to embed a plurality of wires inside the sleepers to improve rigidity and to manufacture a large amount of sleepers at a time, thereby significantly increasing productivity. It relates to a method for producing a concrete sleeper.

일반적으로 철도용 레일이 설치되는 침목은 목재나 콘크리이트 등으로 제조되는데, 목재 침목은 중량이 가볍고 취급이 용이한 반면 가격이 비싸고 산림의 훼손으로 자원을 고갈시키는 등의 문제점이 있다.Generally, sleepers on which rails are installed are manufactured from wood or concrete, and wood sleepers are light in weight and easy to handle, but have high cost and depletion of resources due to deterioration of forests.

그래서, 근래에는 콘크리이트 침목이 사용되고 있으며, 이는 제1도에 도시된 바와 같이 침목 현상을 갖는 금형(10) 내에 숄더(12)를 결합시킨 상태에서 내부에 콘크리이트(C)를 투입하고 공기 중에서 양생시킨 후 금형으로부터 양생된 침목을 취출하는 방식으로 콘크리이트 침목을 제조하고 있다.Therefore, in recent years, concrete sleepers have been used, which in the state in which the concrete (C) is put in the air in the state in which the shoulder 12 is coupled in the mold 10 having the sleeper phenomenon as shown in FIG. After curing, the concrete sleepers are manufactured by taking out the cured sleepers from the mold.

그러나, 이와 같은 종래 콘크리이트 침목의 제조 방법은 침목의 강성이 약하여 기차의 운행에 따라 반복적으로 충격 하중이 작용함으로써 내구성이 현저하게 저하될 뿐만 아니라 수작업이나 부분적인 기계 작업으로 제조가 이루어짐으로써 생산성이 저하되고 코스트가 상승되는 등의 여러 가지 문제점들이 내재되어 있었다.However, such a conventional method of manufacturing concrete sleepers is weak due to the rigidity of the sleepers, the impact load is repeatedly applied according to the operation of the train, not only the durability is markedly lowered, but also the production is performed by manual or partial mechanical work. Several problems were inherent, such as lowering and rising costs.

따라서, 본 발명은 상술한 종래 기술의 문제점들을 해결하기 위하여 발명된 것으로서, 본 발명의 목적은 침목의 내측에 복수 개의 강철 와이어를 매설하여 강성 및 내구성을 향상시킴과 동시에 일시에 많은 량의 침목을 제조할 수 있도록 하여 생산성을 향상시키고 코스트를 절감할 수 있는 콘크리이트 침목의 제조 방법을 제공하는데 있다.Accordingly, the present invention has been invented to solve the above-described problems of the prior art, an object of the present invention is to embed a plurality of steel wires inside the sleeper to improve the rigidity and durability and at the same time a large amount of sleepers The present invention provides a method of manufacturing concrete sleepers that can be manufactured to improve productivity and reduce costs.

이와 같은 목적을 달성하기 위한 본 발명에 따른 콘크리이트 침목의 제조 방법은, 금형의 내측에 복수 개의 와이어를 길이방향으로 설치하고 숄더를 장착한 후 금형의 양 끝단에 격리판을 설치하는 공정과, 상기 금형의 내측에 콘크리이트를 투입하는 공정과, 상기 금형 내의 콘크리이트가 완전하게 양생되기 전에 격리판을 분리하는 공정과, 상기 금형의 상측에 설치된 천막의 내측으로 고온의 증기를 공급하여 콘크리이트를 양생시키는 공정과, 양생된 침목 내의 와이어를 절단하고 금형으로부터 침목을 인출하여 적재하는 공정 및 상기 금형을 청소하고 내부 표면에 오일을 도포하는 공정을 포함한다.The method for producing a concrete sleeper according to the present invention for achieving the above object, the process of installing a plurality of wires in the longitudinal direction of the inside of the mold and mounting the shoulder and then installing the separator on both ends of the mold, Injecting concrete into the mold, separating the separator before the concrete in the mold is completely cured; And a step of cutting the wire in the hardened sleeper, taking out and loading the sleeper from the mold, and cleaning the mold and applying oil to the inner surface.

따라서, 본 발명에서는 일시에 많은 량의 침목을 제조하는 것이 가능하고, 침목의 내측에 복수 개의 강철 와이어가 매설되어 강성 및 내구성이 향상됨과 동시에 고온의 증기에 의해 균일하게 콘크리이트의 양생이 이루어짐으로써 더욱 강성이 증대됨과 동시에 코스트가 현저하게 절감되는 것이다.Therefore, in the present invention, it is possible to manufacture a large amount of sleepers at once, and a plurality of steel wires are embedded inside the sleepers, thereby improving rigidity and durability, and simultaneously curing the concrete by high temperature steam. The stiffness is increased and the cost is significantly reduced.

제1도는 종래 콘크리이트 침목의 제조 방법을 나타내는 개략도이다.1 is a schematic view showing a method for producing a conventional concrete sleeper.

제2도 내지 제10도는 본 발명에 의한 콘크리이트 침목의 제조 방법을 나타내는 도면으로서,2 to 10 is a view showing a method for producing concrete sleepers according to the present invention,

제2도는 금형 내에 숄더를 결합시키는 공정을 나타내는 사시도이다.2 is a perspective view showing a step of engaging the shoulder in the mold.

제3도는 금형 내에 와이어를 설치하는 공정을 나타내는 사시도이다.3 is a perspective view showing a step of installing a wire in a mold.

제4도는 격리판의 설치 상태를 나타내는 도면이다.4 is a view showing the installation state of the separator.

제5도는 금형 내에 콘크리이트를 투입하는 공정을 나타내는 사시도이다.5 is a perspective view showing a step of inserting concrete into a mold.

제6도는 와이어를 절단하는 공정을 나타내는 사시도이다.6 is a perspective view showing a step of cutting a wire.

제7도는 천막을 설치하는 공정을 나타내는 사시도이다.7 is a perspective view illustrating a step of installing a tent.

제8도는 천막 내로 증기를 공급하여 양생하는 공정을 나타내는 사시도이다.8 is a perspective view showing a step of curing by supplying steam into the tent.

제9도는 양생된 침목을 인출하는 공정을 나타내는 도면이다.9 is a view showing a process of taking out the cured sleepers.

제10도는 침목의 인출후 금형을 청소하는 공정을 나타내는 도면이다.10 is a view showing a step of cleaning the mold after the withdrawal of the sleeper.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

20 : 금형 22 : 숄더20: mold 22: shoulder

24 : 와이어 26 : 격리판24: wire 26: separator

28 : 콘크리이트 투입 장치 30 : 와이어 커팅 수단28: concrete input device 30: wire cutting means

32 : 천막 34 : 증기 발생 수단32: tent 34: steam generating means

36 : 침목 인출 수단 38 : 청소 장치36: sleeper withdrawal means 38: cleaning device

40 : 오일40: oil

이하, 본 발명의 바람직한 실시예를 첨부된 도면에 의하여 더욱 상세히 설명한다.Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

먼저, 본 발명은 제2도에 도시한 바와 같이 횡 및 종방향으로 배열된 복수개의 금형(20) 내부에 레일을 고정시키기 위한 숄더(22)를 결합하고, 각각의 금형 (20)내에 제3도에 도시한 바와 같이 길이 방향으로 복수 개의 강철재 와이어(24)를 설치한다.First, as shown in FIG. 2, the present invention combines the shoulders 22 for fixing the rails to the inside of the plurality of molds 20 arranged in the lateral and longitudinal directions, and a third in each mold 20. FIG. As shown in the figure, a plurality of steel wires 24 are provided in the longitudinal direction.

이때, 상기 각 금형(20)의 사이에는 제4도에 도시한 바와 같이 각각 격리판 (26)을 적층하여 인접하는 침목(S)이 길이 방향으로 서로 부착되는 것을 방지한다.At this time, as shown in FIG. 4, the separators 26 are stacked between the molds 20 to prevent adjacent sleepers S from being attached to each other in the longitudinal direction.

이어서, 금형(20)의 내부에 숄더(22), 와이어(24)가 설치되면 제5도에 도시한 바와 같이 콘크리이트 투입 수단(28)을 이용하여 적정의 비율로 배합된 콘크리이트(C)를 투입한다.Subsequently, when the shoulder 22 and the wire 24 are provided inside the mold 20, the concrete C blended at an appropriate ratio using the concrete loading means 28 as shown in FIG. Input

상기 금형(20)내에 투입된 콘크리이트(C)가 1 내지 2시간 후 어느 정도 양생이 이루어지면 금형(20)으로부터 격리판(26)을 분리한다.When the concrete C injected into the mold 20 is cured to a certain degree after 1 to 2 hours, the separator 26 is separated from the mold 20.

이어서, 제7도에 도시한 바와 같이 금형(20)의 상측에 천막(32)을 설치하고, 제8도에 도시한 바와 같이 천막(32)의 내측으로 증기 히터(34)에서 발생된 고온의 증기를 공급하면 콘크리이트(C)의 양생이 이루어지게 된다.Subsequently, as shown in FIG. 7, the tent 32 is provided on the upper side of the mold 20, and as illustrated in FIG. 8, the high temperature generated by the steam heater 34 is generated inside the tent 32. When steam is supplied, curing of the concrete (C) is achieved.

상기 금형(20)의 콘크리이트(C)가 증기에 의해 양생이 이루어지면 천막(32)을 걷고, 제6도에 도시한 바와 같이 와이어 커팅 수단(30)을 이용하여 콘크리이트 (C) 내에 매설된 와이어(24)를 절단하고, 금형(20)내의 침목(S)을 인출하게 된다.When the concrete C of the mold 20 is cured by steam, the user walks the tent 32 and embeds it in the concrete C using the wire cutting means 30 as shown in FIG. The cut wire 24 is cut, and the sleeper S in the mold 20 is taken out.

상기 침목(S)의 인출 작업은 제9도에 도시한 바와 같이 별도의 침목 인출 수단(36)에서 행하여지는데, 진공 수단을 이용하여 금형(20)내의 침목(S)을 흡착하여 상승시킨 후 회동 수단으로 침목(S)을 180°로 반전시켜 별도의 공간에 적재한다.The drawing operation of the sleeper (S) is performed by a separate sleeper extracting means (36), as shown in FIG. 9, which is rotated after absorbing and raising the sleeper (S) in the mold (20) by using a vacuum means. By means of reversing the sleepers (S) to 180 ° to load in a separate space.

상기 금형(20)으로부터 인출된 침목(S)의 인출 작업 및 적재 작업이 완료되면, 제10도에 도시한 바와 같이 브러쉬 등의 소제 장치(38)를 이용하여 금형(20)의 표면에 흡착된 콘크리이트 조작 등의 이물질을 분리하는 청소를 행한다.After the withdrawal and stacking operation of the sleeper S drawn out from the mold 20 is completed, as shown in FIG. 10, the surface of the mold 20 is adsorbed by using a cleaning device 38 such as a brush. Cleaning which separates foreign substances, such as concrete operation, is performed.

그리고, 금형(20)의 표면에 흡착된 이물질의 청소가 완료되면, 다시 금형 (20)의 표면에 오일(40)을 도포한 후 처음의 공정으로 복귀하여 상술한 일련의 작업들을 반복하게 된다.When the cleaning of the foreign matter adsorbed on the surface of the mold 20 is completed, the oil 40 is applied to the surface of the mold 20 again, and then the process returns to the initial process to repeat the above-described series of operations.

상술한 바와 같이 본 발명에 의하면, 일시에 많은 량의 침목을 제조하는 것이 가능하고, 침목의 내측에 복수 개의 강철 와이어가 매설되어 강성 및 내구성이 향상됨과 동시에 고온의 증기에 의해 균일하게 콘크리이트의 양생이 이루어짐으로써 더욱 강성이 향상되고 작업 생산성이 증대됨과 동시에 코스트가 현저하게 절감되는 등의 여러 가지 효과가 있다.As described above, according to the present invention, it is possible to manufacture a large amount of sleepers at a time, and a plurality of steel wires are embedded inside the sleepers, thereby improving rigidity and durability, and uniformly Curing has many effects, such as increased rigidity, increased work productivity, and significantly reduced cost.

Claims (2)

금형의 내측에 복수 개의 와이어를 길이 방향으로 설치하고 숄더를 장착한 후 금형의 양 끝단에 격리판을 설치하는 공정; 상기 금형의 내측에 콘크리이트를 투입하는 공정; 상기 금형 내의 콘크리이트가 완전하게 양생되기 전에 격리판을 분리하는 공정; 상기 금형의 상측에 설치된 천막의 내측으로 고온의 증기를 공급하여 콘크리이트를 양생시키는 공정; 양생된 침목 내의 와이어를 절단하고 금형으로부터 침목을 인출하여 적재하는 공정 및; 상기 금형을 청소하고 내부 표면에 오일을 도포하는 공정을 포함하는 콘크리이트 침목의 제조 방법.Installing a plurality of wires in a length direction inside the mold and mounting a shoulder, and then installing separators at both ends of the mold; Injecting concrete into the mold; Separating the separator before the concrete in the mold is fully cured; Curing the concrete by supplying hot steam to the inside of the tent installed above the mold; Cutting the wire in the cured sleeper and pulling the sleeper out of the mold and loading the sleeper; Cleaning the mold and applying an oil to an inner surface thereof. 제1항에 있어서, 상기 격리판 분리 공정은 콘크리이트 투입 후 1 내지 2 시간 이내에 이루어지는 것을 특징으로 하는 콘크리이트 침목의 제조 방법.The method of claim 1, wherein the separator separation process is performed within 1 to 2 hours after the addition of concrete.
KR1019970059103A 1997-11-10 1997-11-10 Method for manufacturing concrete sleeper KR100243969B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100302150B1 (en) * 1999-04-17 2001-09-22 유금복 Wire tensioning apparatus for manufacturing sleeper
KR102178042B1 (en) 2020-03-04 2020-11-13 아이에스동서 주식회사 Method of Manufacturing Precast Concrete Sleeper Through Individual Tensioning And Its Manufacturing Equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR860001458Y1 (en) * 1981-01-17 1986-07-12 더코카-콜라캄파니 Carbonator for post-mix beverage dispenser
KR890015828A (en) * 1988-04-07 1989-11-25 이일희 Washing concrete product and its manufacturing method
KR930703126A (en) * 1990-11-20 1993-11-29 Concrete railway sleepers with added compression stress and its manufacturing equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR860001458Y1 (en) * 1981-01-17 1986-07-12 더코카-콜라캄파니 Carbonator for post-mix beverage dispenser
KR890015828A (en) * 1988-04-07 1989-11-25 이일희 Washing concrete product and its manufacturing method
KR930703126A (en) * 1990-11-20 1993-11-29 Concrete railway sleepers with added compression stress and its manufacturing equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100302150B1 (en) * 1999-04-17 2001-09-22 유금복 Wire tensioning apparatus for manufacturing sleeper
KR102178042B1 (en) 2020-03-04 2020-11-13 아이에스동서 주식회사 Method of Manufacturing Precast Concrete Sleeper Through Individual Tensioning And Its Manufacturing Equipment

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