KR100407181B1 - concrete injector for centrifugal forming pipe having feed pipe preventing droop - Google Patents
concrete injector for centrifugal forming pipe having feed pipe preventing droop Download PDFInfo
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- KR100407181B1 KR100407181B1 KR10-2001-0059280A KR20010059280A KR100407181B1 KR 100407181 B1 KR100407181 B1 KR 100407181B1 KR 20010059280 A KR20010059280 A KR 20010059280A KR 100407181 B1 KR100407181 B1 KR 100407181B1
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- concrete
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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
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
- B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
- B28B21/22—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts
- B28B21/30—Centrifugal moulding
- B28B21/32—Feeding the material into the moulds
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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
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/76—Moulds
- B28B21/80—Moulds adapted to centrifugal or rotational moulding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/08—Rigid pipes of concrete, cement, or asbestos cement, with or without reinforcement
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
본 발명은 각종 흄관(Hume pipe) 및 P.C관(Prestressed concret pipe)을 원심성형키 위한 콘크리트 투입기에 관한 것으로, 이송관의 선,후단을 별도의 와이어에 의해 연결형성하고, 그 와이어에 일정한 인장력을 가하므로서, 이송관의 단부에서 발생하는 처짐모멘트를 이송관의 전체로 분산시켜 이송관의 단부 처짐을 방지함은 물론 이송관의 처짐방지에 따른 안전사고의 감소 및 제품 불량률이 현저하게 감소하는 효과가 있는 것이다.The present invention relates to a concrete injector for centrifugal molding of various hume pipes and PC pipes (Prestressed concret pipe), connecting the line and the rear end of the transfer pipe by a separate wire to form a constant tensile force on the wire By dispersing the deflection moment occurring at the end of the conveying pipe to the whole of the conveying pipe, the deflection of the conveying pipe is prevented, as well as the reduction of safety accidents and product defect rate due to the sagging of the conveying pipe. There is.
Description
본 발명은 각종 흄관(Hume pipe) 및 P.C관(Prestressed concret pipe)을 원심성형키 위한 콘크리트 투입기에 관한 것으로, 특히 이송스크류가 내장된 이송관의 선,후단에 장력이 인가된 와이어를 결합하므로서, 와이어의 장력에 의해 이송관의 처짐을 예방하므로 원심몰드의 회전시 안전사고를 예방하면서도 제품의 불량률을 극소화하는 콘크리트 투입기의 이송관 처짐방지에 대한 것이다.The present invention relates to a concrete injector for centrifugal molding of various hume pipes and PC pipes (Prestressed concret pipe), in particular by combining the wire applied tension to the line, the end of the transfer pipe with a built-in transfer screw, It prevents sagging of the conveying pipe by tension of the wire, and prevents sagging of the concrete feeder which minimizes the defect rate of the product while preventing safety accidents during the rotation of the centrifugal mold.
콘크리트 투입기는 콘크리트 투입호퍼에 내장된 콘크리트를 구동모터와 함께 연동하는 회전스크류에 의해 이송관의 단부로 이송시켜 이송관의 단부로 콘크리트가 배출되게 하는 것이며,Concrete injector is to transfer the concrete embedded in the concrete input hopper to the end of the transfer pipe by the rotating screw interlocked with the drive motor to discharge the concrete to the end of the transfer pipe,
그 콘크리트 투입기를 레일의 상부에서 전,후 왕복되게 하고, 이송관의 배출단부에는 별도의 회전몰드를 형성하여, 전후 왕복하는 이송관의 배출단부에서 지속적으로 콘크리트를 배출하고 회전몰드는 연속하여 회전하므로, 회전몰드 내부에 배출된 콘크리트가 회전몰드의 내벽에 원심에 의해 점착되며 관체를 형성하게 되는것이다.The concrete injector is reciprocated before and after at the top of the rail, and a separate rotary mold is formed at the discharge end of the transfer pipe, and the concrete is continuously discharged from the discharge end of the transfer pipe reciprocating back and forth, and the rotary mold is continuously rotated. Therefore, the concrete discharged inside the rotating mold is adhered to the inner wall of the rotating mold by centrifugation to form a tubular body.
이러한, 원심성형관은 기계적인 방법으로는 성형이 불가능한 대형의 흄관(Hume pipe) 및 P.C관(Prestressed concret pipe) 등을 지칭하는 것으로서, 흄관은 통상적으로 2.5미터정도의 길이로 제작되는 반면, P.C관은 4.5미터정도의 길이를 갖고 형성되므로 그 원심성형관의 종류에 따라 회전스크류 및 이송관을 교체하여 적절한 길이를 갖는 이송장치를 콘크리트 투입기에 장착하여 사용하는 것이다.The centrifugal forming tube refers to a large fume pipe and a prestressed concret pipe which cannot be formed by a mechanical method, and the fume tube is generally manufactured to a length of about 2.5 meters, whereas a PC tube Since it is formed with a length of about 4.5 meters, according to the type of centrifugal forming tube, the rotating screw and the conveying tube are replaced and the conveying apparatus having an appropriate length is used by mounting the concrete injector.
그러나, 전기한 콘크리트 투입기에 있어서, P.C관을 성형하고자 하는 경우에는 이송관의 길이가 P.C관의 길이보다 길어야 하므로, 이송관은 대략 5미터 정도의 길이를 갖게 되는데, 이때에는 그 기구적인 특성에 의해 회전스크류를 내장한 이송관의 단부에서 처짐이 발생하여, 회전몰드에 의한 관체성형시 안전사고의 발생률이 높으며, 이송관의 처짐에 따라 제품불량이 발생하는 문제점이 있는 것이다.However, in the case of the concrete feeder described above, the length of the transfer pipe should be longer than that of the PC pipe when the PC pipe is to be formed, so that the transfer pipe has a length of about 5 meters. Thereby, the deflection occurs at the end of the transfer pipe with a built-in rotary screw, the occurrence rate of the safety accident during the molding of the tube by the rotational mold, there is a problem that the product defects caused by the deflection of the transfer tube.
본 발명은 전기한 바와 같은 문제점을 제거코자 안출된 것으로서, 이송관의 선,후단을 별도의 와이어에 의해 연결형성하고, 그 와이어에 일정한 인장력을 가하므로서, 이송관의 단부에서 발생하는 처짐모멘트를 이송관의 전체로 분산시켜 이송관의 단부 처짐을 방지함은 물론 이송관의 처짐방지에 따른 안전사고의 감소 및 제품 불량률이 현저하게 감소하는 효과가 있는 처짐방지용 이송관을 갖는 원심성형관용 콘크리트 투입기를 제공함에 본 발명의 목적이 있는 것이다.The present invention has been made to eliminate the problems described above, by connecting the wires and the rear end of the transfer pipe by a separate wire, while applying a constant tensile force to the wire, the deflection moment generated at the end of the transfer pipe Centrifugal molding machine concrete feeder with a deflection prevention pipe that has the effect of preventing the end of the conveying pipe from sagging and reducing the safety accident and the product defect rate. It is an object of the present invention to provide.
도 1은 통상의 콘크리트 투입기를 도시한 전체도1 is an overall view showing a conventional concrete injector
도 2는 본 발명에 따른 이송관을 확대도시한 분리사시도Figure 2 is an exploded perspective view showing an enlarged transfer pipe according to the present invention
도 3은 본 발명에 따른 이송관의 전체도Figure 3 is an overall view of the transfer pipe according to the present invention
도 4는 도 3의 A-A'선을 도시한 측단면도4 is a side cross-sectional view taken along line AA ′ of FIG. 3.
도 5는 도 3의 B-B'선을 도시한 측면도FIG. 5 is a side view illustrating the line BB ′ of FIG. 3.
도 6은 본 발명에 따른 이송관에 와이어 장력을 인가하는 상태도Figure 6 is a state diagram for applying a wire tension to the conveying tube according to the present invention
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
1 : 투입호퍼 2 : 회전스크류1: Input Hopper 2: Rotating Screw
4 : 구동모터 5 : 본체4: driving motor 5: main body
6,6' : 롤러 7 : 레일6,6 ': Roller 7: Rail
10 : 이송관 11 : 본체관10: transfer pipe 11: body pipe
12 : 연장관 13,13' : 결합공12: extension pipe 13,13 ': coupling hole
14,14' : 플랜지 15 : 플랜지14,14 ': flange 15: flange
16,16' : 경사공 17,17' : 돌출부16,16 ': inclined hole 17,17': protrusion
18 : 와이어 19,19' : 분할웨지18: wire 19,19 ': split wedge
20 : 인장기20: tensioner
이하, 본 발명의 바람직한 실시예를 설명한다.Hereinafter, preferred embodiments of the present invention will be described.
도 1은 통상의 콘크리트 투입기를 도시한 전체도이고, 도 2는 본 발명에 따른 이송관을 확대도시한 절개사시도이다.1 is a general view showing a conventional concrete injector, Figure 2 is an enlarged cutaway perspective view showing a transfer pipe according to the present invention.
콘크리트 재료를 공급받기 위한 투입호퍼(1)와, 콘크리트를 이송하기 위한 회전스크류(2)를 내장한 이송관(10) 및 전기한 회전스크류(2)를 회전시키는 구동모터(4), 전기한 투입호퍼(1) 및 구동모터(4)를 지지하고 있는 본체(5)와, 본체(5)의 저면에 장착된 롤러(6)(6')를 회전시켜 본체(5)가 레일(7)위를 전,후 왕복되게 함에 따라 별도의 회전몰드 내부에 콘크리트가 배출되게 한 통상의 원심성형관용 콘크리트 투입기에 있어서,An input hopper 1 for receiving concrete material, a conveying tube 10 having a rotating screw 2 for conveying concrete, a driving motor 4 for rotating the electric rotating screw 2, and an electric The main body 5 supporting the input hopper 1 and the driving motor 4 and the rollers 6 and 6 'mounted on the bottom of the main body 5 are rotated so that the main body 5 is the rail 7. In the concrete injector for a conventional centrifugal forming pipe that allows concrete to be discharged inside a separate rotating mold as the stomach is reciprocated before and after,
이송관(10)을, 본체와 결합된 본체관(11)과 그 본체관(11)과 결합되는 연장관(12)으로 분리 형성하고, 본체관(11)과 연장관(12)의 대향단부에는 다수의 결합공(13)(13')이 형성된 플랜지(14)(14')를 대향되게 형성하고, 연장관(12)의 타단에는 또다른 플랜지(15)를 형성하되,The transfer pipe 10 is separated into a main body tube 11 coupled to the main body and an extension tube 12 coupled to the main body tube 11, and a plurality of transfer tubes 10 are provided at opposite ends of the main body tube 11 and the extension tube 12. The flanges 14 and 14 'formed of coupling holes 13 and 13' are formed to face each other, and another flange 15 is formed at the other end of the extension pipe 12,
본체관(11)의 플랜지(14)와 연장관의 플랜지(15) 상부 양측에 경사공(16)(16')이 형성된 돌출부(17)(17')를 각각 대향되게 형성하고, 그 경사공(16)(16')을 서로 관통하는 와이어(18)를 삽입하며, 그 경사공(16)(16')의 내부에 다수의 경사상 분할웨지(19)(19')를 삽입하므로서, 경사상분할웨지(19)(19')에 의해 와이어(18)를 지지고정되게 구성한 것이다.Protruding portions 17 and 17 'having inclined holes 16 and 16' are formed on both sides of the flange 14 of the main body tube 11 and the upper side of the flange 15 of the extension tube, respectively. 16 and 16 'are inserted into each other, and a plurality of inclined dividing wedges 19 and 19' are inserted into the inclined holes 16 and 16 '. The wires 18 are configured to be supported and fixed by the split wedges 19 and 19 '.
도면중 미설명 부호 20은 인장기이다.In the figure, reference numeral 20 denotes a tensioner.
이상과 같은 구성에 의한 본 발명의 작용을 첨부도면에 의해 보다 상세히 설명하면 다음과 같다.Referring to the operation of the present invention by the above configuration in more detail by the accompanying drawings as follows.
도 2는 본 발명 이송관(10)을 확대도시한 것으로서, 이송관(10)은 본체(5)와 결합되는 본체관(11)과, 그 본체관(11)에 성형목적에 따라 각기 길이를 달리하는 연장관(12)으로 구본되어 있는 것이며, 본체관(11)의 플랜지(14)와 연장관(12)의 플랜지(14')가 서로 대향되어 결합공(13)(13')에 의해 볼트 등으로 서로 결합되는 것임을 알 수 있다.2 is an enlarged view of the transfer pipe 10 of the present invention, the transfer pipe 10 is a main body tube 11 is coupled to the main body 5, and the length of each of the main body tube 11 according to the molding purpose The flange 14 of the main body pipe 11 and the flange 14 'of the extension pipe 12 are opposed to each other, and the bolts and the like are joined by the coupling holes 13 and 13'. It can be seen that they are combined with each other.
도 3은 이러한 분할구조를 갖는 본 발명에 따른 이송관(10)의 전체 결합도로서, 내부에 회전스크류(2)가 내장된 이송관(10)이 길게 형성된 것이다.3 is an overall coupling view of the transfer pipe 10 according to the present invention having such a split structure, in which a transfer pipe 10 having a rotary screw 2 embedded therein is formed long.
도 4는 도 3의 이송관을 A-A'선 단면도시한 것으로서, 본체관(11)의 단부 플랜지(14)의 상부 양측에 경사공(16)(16')을 갖는 돌출부(17)(17')가 형성되어 있는 것을 알 수 있으며, 그 경사공(16)(16')의 내부에는 경사면을 갖는 다수의 분할웨지(19)(19')가 삽입되어 있는 것이다.4 is a cross-sectional view taken along the line A-A 'of the transfer pipe of FIG. 3, and has a protrusion 17 (16') having inclined holes 16 and 16 'on both sides of the upper end flange 14 of the main body pipe 11 ( 17 ') is formed, and a plurality of split wedges 19 and 19' having inclined surfaces are inserted into the inclined holes 16 and 16 '.
또한, 도 5는 도 3의 이송관을 B-B'선 도시한 것으로서, 연장관(12)의 단부에 형성된 플랜지(15)의 상부 양측에 전기한 바와 같은 경사공(16)(16')을 갖는 돌출부(17)(17')가 형성되어 있는 것을 알 수 있으며, 그 경사공(16)(16')의 내부에는 경사면을 갖는 다수의 분할웨지(19)(19')가 삽입되어 있는 것이다.5 is a B-B 'line of the transfer pipe of FIG. 3, and shows the inclined holes 16 and 16' as described above on both upper sides of the flange 15 formed at the end of the extension pipe 12. As shown in FIG. It can be seen that the protruding portions 17 and 17 'having a plurality of split wedges 19 and 19' are inserted into the inclined holes 16 and 16 '. .
이러한 본체관(11) 및 연장관(12)의 단부를 서로 연결하는 와이어(18)를 본체관(11) 측의 분할웨지(19)(19') 및 연장관(12) 측의 분할웨지(19)(19')에 삽입하여 그 와이어(18)에 장력을 가하므로서 이송관의 처짐현상을 방지하는 것인데,The wires 18 connecting the ends of the main body tube 11 and the extension tube 12 to each other are divided wedges 19 and 19 'on the main body tube 11 side and the split wedges 19 on the extension tube 12 side. Is inserted into the (19 ') to tension the wire (18) to prevent sagging of the feed pipe,
먼저, 연장관(12) 측의 돌출부(17)(17')에 와이어(18) 및 분할웨지(19)(19')를 삽입하고, 와이어(18)의 다른 단부는 본체관(11)의 단부 플랜지(14)에 형성된 돌출부(17)(17')의 경사공(16)(16')에 삽입한 상태에서, 별도의 인장기(20)를 이용하여 와이어(18)의 노출단부를 잡아당겨 와이어(18)에 충분한 장력을 가한 뒤, 또다른 분할웨지(19)(19')를 그 와이어(18)의 외주면 및 경사공(16)(16')에 삽입하여 경사공(16)(16') 내부에 밀착시킨다.First, the wire 18 and the split wedges 19 and 19 'are inserted into the protrusions 17 and 17' on the extension tube 12 side, and the other end of the wire 18 is an end of the main tube 11. In the state of being inserted into the inclined holes 16 and 16 'of the protrusions 17 and 17' formed in the flange 14, the exposed end of the wire 18 is pulled out using a separate tensioner 20. After sufficient tension is applied to the wire 18, another split wedge 19, 19 ′ is inserted into the outer circumferential surface of the wire 18 and the inclined holes 16, 16 ′ to incline the holes 16, 16. ') Close inside.
이러한 상태에서 인장기(20)에 의해 인장되어 있던 와이어(18)를 놓게 되면, 인장기(20)의 장력에 의해 인장되었던 와이어(18)가 복원되려는 힘을 받게 되는 것이며, 이러한 복원력은 분할웨지(19)(19')를 경사공(16)(16')의 내부로 밀착시키려는 힘을 가하는 것이며, 이러한 힘은 분할웨지(19)(19')가 더욱 경사공(16)(16')에 밀착되게 함은 물론 분할웨지(19)(19')가 밀착됨에 따라 그 와이어(18)를 더욱 강하게 압압하므로 와이어(18)의 이탈없이 견고한 고정이 되는 것이다.In this state, when the wire 18 tensioned by the tensioner 20 is released, the wire 18 tensioned by the tensioner 20 receives a force to be restored, and this restoring force is divided wedge. (19), (19 ') is to apply a force to close the inside of the inclined holes (16, 16'), the force is divided wedge (19) (19 ') is more inclined holes (16, 16') As well as close contact with the split wedges (19, 19 ') as the wire 18 is pressed more strongly, so that the tight fixing without leaving the wire 18.
또한, 그 분할웨지(19)(19')의 내주면에는 다수의 톱니 등을 형성하므로서 분할웨지(19)(19')와 와이어(18)간의 마찰력을 증대시켜 와이어(18)가 분할웨지(19)(19')와 미끌어져 서로 이탈되는 것을 방지할 수도 있는 것이다.In addition, by forming a plurality of teeth or the like on the inner circumferential surface of the split wedges 19 and 19 ', the friction force between the split wedges 19 and 19' and the wire 18 is increased to allow the wire 18 to split the wedge 19. (19 ') can be prevented from slipping away from each other.
또한, 전기한 바와 같이 그 이송관(10)에 적당량의 인장력이 가해진 상태에서 노출된 와이어(18)를 적당길이로 잘라내면 작업이 완성되는 것이다.In addition, as described above, when the appropriate amount of tensile force is applied to the transfer pipe 10, the exposed wire 18 is cut to a suitable length to complete the work.
따라서, 상대적으로 처짐응력이 적은 본체관(11)과 처짐응력이 많은 연장관(12)을 별도의 연결 와이어(18)에 의해 장력이 인가된 상태로 결합하므로서, 연장관(12)의 단부에서 발생하는 처짐모멘트를 연장관(12) 전체로 고루 확산시키므로 연장관(12)의 처짐이 극히 미미하여 이송관(10)의 처짐에 따른 안전사고의 우려가 전혀 없는 것이며, 회전성형관의 내부에 발생하는 불량이 거의 없게 되는 것이다.Therefore, the body tube 11 having a relatively small deflection stress and the extension tube 12 having a large deflection stress are coupled to each other in a state where tension is applied by a separate connection wire 18. Since the deflection moment is spread evenly throughout the extension tube 12, the deflection of the extension tube 12 is extremely small, and there is no fear of safety accidents due to the deflection of the transfer tube 10. There will be no.
이상과 같은 본 발명 처짐방지용 이송관을 갖는 원심성형관용 콘크리트 투입기는 이송관의 단부에서 발생하는 처짐모멘트를 이송관의 전체로 분산시켜 이송관의 단부 처짐을 방지함은 물론 이송관의 처짐방지에 따른 안전사고의 감소 및 제품 불량률이 현저하게 감소하는 효과가 있는 것이다.Concrete injector for centrifugal forming pipes having the present invention for preventing deflection pipes as described above is distributed to the entire conveying pipe to prevent deflection moment occurring at the end of the conveying pipe to prevent end deflection of the conveying pipe as well as to prevent sagging of the conveying pipe. According to the reduction of safety accidents and product defect rate is significantly reduced.
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| KR10-2001-0059280A KR100407181B1 (en) | 2001-09-25 | 2001-09-25 | concrete injector for centrifugal forming pipe having feed pipe preventing droop |
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| KR10-2001-0059280A KR100407181B1 (en) | 2001-09-25 | 2001-09-25 | concrete injector for centrifugal forming pipe having feed pipe preventing droop |
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| KR100407181B1 true KR100407181B1 (en) | 2003-11-28 |
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| KR100665707B1 (en) * | 2004-12-13 | 2007-01-09 | 주식회사 보림에쓰에쓰 | Pouring methods for MSPC mixture |
| CN111469262B (en) * | 2020-04-02 | 2021-05-11 | 四川东汇金筑建材有限公司 | Core tube prefabricating equipment |
Citations (6)
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|---|---|---|---|---|
| JPH0224102A (en) * | 1988-07-13 | 1990-01-26 | Asou Koatsu Concrete Kk | Manufacture of corrosion-resistant pipe and its device |
| JPH05116130A (en) * | 1991-10-30 | 1993-05-14 | Asou Cement Kk | Material feeder in resin concrete pipe manufacturing apparatus |
| KR940005354A (en) * | 1992-07-14 | 1994-03-21 | 와다 요시히로 | How to create a tool movement path for NC machining |
| KR950023496A (en) * | 1994-01-25 | 1995-08-18 | 육기동 | Manufacturing method of high strength concrete pipe |
| JPH0880523A (en) * | 1994-09-14 | 1996-03-26 | Kyushu Koatsu Concrete Kogyo Kk | Manufacture of concrete pole and device therefor |
| JPH08150613A (en) * | 1991-02-14 | 1996-06-11 | Pub Works Res Inst Ministry Of Constr | Fiber reinforced resin concrete hume pipe and its production |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0224102A (en) * | 1988-07-13 | 1990-01-26 | Asou Koatsu Concrete Kk | Manufacture of corrosion-resistant pipe and its device |
| JPH08150613A (en) * | 1991-02-14 | 1996-06-11 | Pub Works Res Inst Ministry Of Constr | Fiber reinforced resin concrete hume pipe and its production |
| JPH05116130A (en) * | 1991-10-30 | 1993-05-14 | Asou Cement Kk | Material feeder in resin concrete pipe manufacturing apparatus |
| KR940005354A (en) * | 1992-07-14 | 1994-03-21 | 와다 요시히로 | How to create a tool movement path for NC machining |
| KR950023496A (en) * | 1994-01-25 | 1995-08-18 | 육기동 | Manufacturing method of high strength concrete pipe |
| JPH0880523A (en) * | 1994-09-14 | 1996-03-26 | Kyushu Koatsu Concrete Kogyo Kk | Manufacture of concrete pole and device therefor |
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