KR100515204B1 - Connection structure of reinforcing bar for concrete reinforcement and processing method of the connection - Google Patents

Connection structure of reinforcing bar for concrete reinforcement and processing method of the connection Download PDF

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Publication number
KR100515204B1
KR100515204B1 KR1019980013131A KR19980013131A KR100515204B1 KR 100515204 B1 KR100515204 B1 KR 100515204B1 KR 1019980013131 A KR1019980013131 A KR 1019980013131A KR 19980013131 A KR19980013131 A KR 19980013131A KR 100515204 B1 KR100515204 B1 KR 100515204B1
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South Korea
Prior art keywords
concrete reinforcement
reinforcing bar
connection
concrete
bar
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KR1019980013131A
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Korean (ko)
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KR19990080123A (en
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박건호
유충기
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신우산업 주식회사
정경옥
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/022—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling combined with rolling splines, ribs, grooves or the like, e.g. using compound dies
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
    • E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
    • E04C5/165—Coaxial connection by means of sleeves

Abstract

연결부의 철근 조직을 파괴시키지 않고 가공할 수 있도록 하여 이의 연결부에 대한 기계적 강도를 향상시키고, 연결작업이 매우 용이하여 공기단축과 비용을 절감시킬 수 있는 콘크리트 보강용 이형봉강의 연결부 구조와 그 연결부의 가공방법을 제공할 목적으로It can be processed without destroying the reinforcing bar structure of the connecting part to improve the mechanical strength of the connecting part, and the connection part structure of the reinforcing bar for concrete reinforcement which can reduce the air shortening and cost by making the connecting work very easy and the connecting part For the purpose of providing a processing method

2개의 콘크리트 보강용 이형봉강을 상호 길이방향으로 연결하기 위하여 이들 단부에 연결부를 형성함에 있어서, 이 연결부의 외주면에 둥근 나사부로 형성한 콘크리트 보강용 이형봉강의 연결부 구조를 제공하고,In forming the connecting portions at these ends for connecting the two concrete reinforcing bars in the longitudinal direction to each other, providing a connection structure of the reinforcing bar for the concrete reinforcing bar formed by round threads on the outer circumferential surface of the connecting part,

상기와 같은 연결부를 가공하기 위하여 콘크리트 보강용 이형봉강의 연결부 범위내에 있는 원주형 리브와 길이방향 리브를 제거하는 제 1공정과; 상기 제 1공정을 거친 연결부를 형단조 금형에 삽입시켜 상온 형단조시키는 제 2공정과; 상기 제 2공정에서 상온 형단조 성형된 연결부의 외주면에 전조작업으로 둥근나사를 성형하는 제 3공정; 을 포함하여 이루어지는 콘크리트 보강용 이형봉강의 연결부 가공방법을 제공한다.A first step of removing columnar ribs and longitudinal ribs within the range of the connection portion of the deformed bar for concrete reinforcement to process such a connection portion; A second step of inserting the connection part which passed through the said 1st process into a die-forging die, and forging at room temperature; A third step of forming a round screw by a rolling operation on an outer circumferential surface of the connection part forged at room temperature in the second step; It provides a connection part processing method of the release bar for concrete reinforcement comprising a.

Description

콘크리트 보강용 이형봉강의 연결부 구조와 그 연결부의 가공방법Connection part structure of deformed bar for concrete reinforcement and processing method

본 발명은 건설, 토목 현장에서 시공물의 골격을 형성하는 콘크리트 보강용 이형봉강의 연결부 구조와 그 연결부의 가공방법에 관한 것이다.The present invention relates to a connection part structure of a deformed bar for reinforcing concrete to form a skeleton of a construction object in construction and civil engineering, and a processing method of the connection part.

예컨대, 건설 및 토목 현장에서는 콘크리트 보강용 이형봉강을 이용하여 기본 골격을 세운 후에 콘크리트를 타설 양생시키는 과정으로 시공물을 건축하게 된다.For example, in the construction and civil engineering site, the construction of the construction by the process of pouring concrete after erecting the basic skeleton by using the reinforcing bar for concrete reinforcement.

그리고 상기 콘크리트 보강용 이형봉강은 제조업체에서 소정의 길이로 절단되어 공급되기 때문에 시공물의 크기에 따라 콘크리트 보강용 이형봉강을 절단하거나 상호 연결하여 요구하는 길이로 만들어 사용하게 되는데, 본 발명은 콘크리트 보강용 이형봉강을 길이방향으로 연결하는 것에 관계한다.And since the deformed bar for concrete reinforcement is cut and supplied to a predetermined length by the manufacturer, the deformed bar for concrete reinforcement is cut or interconnected according to the size of the construction to be used to make the required length. Related to connecting longitudinal bars in longitudinal direction.

즉, 콘크리트 보강용 이형봉강을 길이방향으로 연결함에 있어서는 여러 가지 방법이 알려져 있는데, 그 대표적인 연결방법을 살펴보면 다음과 같다.In other words, there are a number of known methods for connecting the reinforcing bars for concrete reinforcement in the longitudinal direction.

먼저, 연결하고자 하는 콘크리트 보강용 이형봉강을 맞대어 놓고 용접기를 이용하여 그 연결부위를 재결정 온도이상까지 가열하여 압착시키는 가스 압접법과,First, a gas welding method in which a deformed bar for concrete reinforcement to be connected to each other is opposed to each other, and a welding part is heated and pressed to a temperature above a recrystallization temperature by using a welding machine;

연결하고자 하는 콘크리트 보강용 이형봉강의 연결부위에 파이프 형상의 슬리이브를 끼워놓고 이의 슬리이브를 가압하여 콘크리트 보강용 이형봉강에 압착시키는 방법과,Inserting a pipe-shaped sleeve into the connection part of the reinforcing bar for concrete reinforcement to be connected and pressing the sleeve to press the sleeve to compress the reinforcing bar for concrete reinforcement;

연결하고자 하는 콘크리트 보강용 이형봉강을 겹쳐 놓고 슬리이브를 끼운 후에 철근과 콘크리트 보강용 이형봉강 사이에 쐐기를 박아 연결하는 방법과,Overlapping the reinforcing bars for concrete reinforcement to be connected and inserting sleeves, and then connecting a wedge between the reinforcing bars and the reinforcing bars for concrete reinforcement,

연결하고자 하는 부위에 슬리이브를 끼워놓고 콘크리트 보강용 이형봉강과 슬리이브 사이에 화학약품(레진)을 투입하는 화학약품에 의한 방법 등이 알려져 있다.A method by chemically inserting a sleeve into a portion to be connected and injecting a chemical (resin) between a release bar for concrete reinforcement and the sleeve is known.

그러나, 이들 방법은 공통적으로 연결부위의 기계적 강도가 기준치에 못미치는 등 연결부위에 대한 신뢰성이 저하되고, 연결작업이 어려우며, 비용이 크게 상승된다는 문제점을 내포하고 있다.However, these methods have a problem in that the reliability of the connection portion is degraded, the connection work is difficult, and the cost is greatly increased, such that the mechanical strength of the connection portion is less than the standard value.

이에 따라 최근에는 콘크리트 보강용 이형봉강의 양 선단 연결부에 나사부를 형성하여 내경부에 암나사가 형성된 슬리이브의 체결하여 연결하는 방법이 널리 이용되고 있다.Accordingly, in recent years, a screw part is formed at both ends of the reinforcing bar for concrete reinforcement, and a method of fastening and connecting a sleeve having a female thread in the inner diameter part is widely used.

그러나, 상기와 같이 콘크리트 보강용 이형봉강의 연결부에 나사부를 형성함에 있어서, 종래에는 열간, 냉간 또는 온간상태에서 업셋팅한 후, 이 부위의 외주면에 절삭가공 등에 의해 나사부를 형성하는 것이 일반적이었다.However, in the formation of the threaded portion at the connection portion of the release bar for concrete reinforcement as described above, it has conventionally been conventional to form the threaded portion on the outer circumferential surface of this portion by cutting or the like after upsetting in a hot, cold or warm state.

그러나 상기와 같이, 콘크리트 보강용 이형봉강의 연결부에 절삭가공으로 나사를 형성하는 경우에는 나사부 절삭가공이 용이하지 않음은 물론 업셋팅에 의하여 얻어진 철근 조직을 파괴시키게 됨으로써, 그 부위에 노치(Notch)부를 발생시켜 취약하게 한다는 문제점을 내포하고 있다.However, as described above, when the screw is formed by cutting at the connection portion of the deformed bar for concrete reinforcement, not only is it easy to cut the thread but also destroys the reinforcing tissue obtained by the upsetting, and thus notches on the site. It has the problem of generating wealth and making it vulnerable.

이에 따라 본 발명자는 상기 종래 기술에 대한 문제점을 예의 연구한 결과, 연결부의 철근 조직을 파괴시키지 않고 가공할 수 있도록 하여 이의 연결부에 대한 기계적 강도를 향상시키고, 연결작업을 매우 용이하여 공기단축과 비용을 절감시킬 수 있는 콘크리트 보강용 이형봉강의 연결부 구조와 그 연결부의 가공방법을 제안하게 되었다.Accordingly, the present inventors have studied the problems of the prior art as a result, can be processed without destroying the reinforcing bar structure of the connection portion to improve the mechanical strength of the connection portion, and very easy to connect the work to reduce the air and cost The structure of the connection part of the deformed bar for concrete reinforcement and the processing method of the connection part can be proposed.

이를 실현하기 위하여 본 발명은 2개의 콘크리트 보강용 이형봉강을 상호 길이방향으로 연결하기 위하여 이들 단부에 연결부를 형성함에 있어서,In order to realize this, the present invention is to form a connecting portion at these ends in order to connect the two longitudinal reinforcing bar for concrete reinforcement with each other,

이 연결부의 외주면에 둥근 나사부로 형성한 콘크리트 보강용 이형봉강의 연결부 구조를 제공한다.Provided is a connection structure of a release bar for reinforcement of concrete, formed by round threads on the outer circumferential surface of the connection portion.

상기에서 둥근 나사는 나사산 지름 d1와, 콘크리트 보강용 이형봉강의 원주형 리브 바깥지름 d2가, d1 ≤ d2이 되도록 형성한 것에 특징이 있다.The round screw is characterized in that the thread diameter d1 and the circumferential rib outer diameter d2 of the reinforcing bar for concrete reinforcement are formed such that d1 ≦ d2.

상기와 같은 연결부를 가공하기 위하여 콘크리트 보강용 이형봉강의 연결부 범위내에 있는 원주형 리브와 길이방향 리브를 제거하는 제 1공정과;A first step of removing columnar ribs and longitudinal ribs within the range of the connection portion of the deformed bar for concrete reinforcement to process such a connection portion;

상기 제 1공정을 거친 연결부를 형단조 금형에 삽입시켜 상온 형단조시키는 제 2공정과;A second step of inserting the connection part which passed through the said 1st process into a die-forging die, and forging at room temperature;

상기 제 2공정에서 상온 형단조 성형된 연결부의 외주면에 전조작업으로 둥근나사를 성형하는 제 3공정;A third step of forming a round screw by a rolling operation on an outer circumferential surface of the connection part forged at room temperature in the second step;

을 포함하여 이루어지는 콘크리트 보강용 이형봉강의 연결부 가공방법을 제공한다.It provides a connection part processing method of the release bar for concrete reinforcement comprising a.

상기 제 2공정에서는 연결부의 단면적을 콘크리트 보강용 이형봉강의 유효 단면적과 동일하거나 크게 상온에서 형단조를 실시함에 그 특징이 있다.In the second step, the cross-sectional area of the connection part is characterized in that the forging is performed at room temperature, which is equal to or larger than the effective cross-sectional area of the reinforcing bar for concrete reinforcement.

도 1은 가공전 콘크리트 보강용 이형봉강의 정면도로서, 이의 콘크리트 보강용 이형봉강(2)은 그 외주면에 등간격으로 원주형 리브(4)와 길이방향 리브(6)가 형성되어 있다.1 is a front view of a release bar for reinforcing concrete before processing, wherein the release bar 2 for reinforcing concrete is formed on the outer circumferential surface thereof with columnar ribs 4 and longitudinal ribs 6 at equal intervals.

이러한 콘크리트 보강용 이형봉강(2)의 연결부(8)에 나사부를 가공함에 있어서, 본 발명은 도 2에서와 같이, 제 1공정에서 나사부를 가공할 범위 안에 있는 원주형 리브(4)와 길이방향 리브(6)를 제거한다.In machining the threaded portion to the connecting portion 8 of the release bar 2 for concrete reinforcement, the present invention, as shown in Figure 2, in the longitudinal direction and the columnar ribs 4 in the range to machine the threaded portion in the first process Remove the rib (6).

이는 콘크리트 보강용 이형봉강(2)의 제조과정에서 리브(4)(6)의 돌출부분이 콘크리트 보강용 이형봉강(2)의 고유조직과는 달리 기형적으로 경화되어 상온 단조시 원활한 성형이 이루어지지 않기 때문이며, 이 공정을 통해 경화층 및 산화철을 제거하게 된다.In the manufacturing process of the deformed bar for concrete reinforcement (2), unlike the inherent structure of the deformed bar (2) for concrete reinforcement, the protruding portion of the ribs (4) and (6) is hardened deformably so that smooth molding is not possible at room temperature forging. This process removes the hardened layer and the iron oxide.

그리고 제 2공정에서는 도 4에서와 같이, 원주형 리브(4)와 길이방향 리브(6)가 제거된 연결부(8)를 업셋터의 형단조 금형(10)에 삽입시킨 후에 플런저(12)로 타격하는 업셋팅 작업을 실시하여 이의 연결부(8)의 단면적을 콘크리트 보강용 이형봉강(2)의 유효 단면적과 동일하거나 크게 상온에서 형단조를 실시하게 된다.In the second process, as shown in FIG. 4, the connecting portion 8 from which the columnar ribs 4 and the longitudinal ribs 6 are removed is inserted into the forging die 10 of the upsetter, and then into the plunger 12. By performing the up-setting operation to strike the cross-sectional area of the connection portion 8 of the mold forging at room temperature equal to or greater than the effective cross-sectional area of the release bar (2) for concrete reinforcement.

상기와 같이 상온 형단조를 실시하는 것은 프레스 등으로 절단된 콘크리트 보강용 이형봉강(2)의 단면이 찌그러진 상태이므로 자유단조 방식으로는 굴절이 발생되어 성형이 제대로 이루어지지 않게 되는 바, 일정한 지름을 갖는 금형속에 삽입시켜 단조를 행하는 것이며, 이의 형단조에 의하여 연결부(8)를 성형하는 경우에는 변화되는 단면적비를 최소화할 수 있기 때문에 가공 경화에 의한 피로파괴를 방지할 수 있기 때문이다.Performing a room temperature die forging as described above is a cross-sectional state of the deformed bar (2) for concrete reinforcement cut by a press, etc., because the free forging method is a refraction occurs and the molding is not performed properly, bar diameter This is because it is inserted into a mold having a mold and forged, and when the connecting portion 8 is molded by the die forging, it is possible to minimize the change in the cross-sectional area, so that fatigue failure due to work hardening can be prevented.

상기와 같이 제 2공정을 마친 후에는 제 3공정으로 이의 연결부(8)에 나사를 가공하게 되는데, 이때에는 절삭 가공이 아닌 전조가공으로 나사부를 형성하게 된다.After finishing the second process as described above, the screw is processed to its connecting portion 8 in the third process, in which case the thread is formed by rolling instead of cutting.

본 발명에서 나사부를 전조가공으로 성형하는 것은 도 5에서와 같이 소재의 섬유조직이 절단되지 않고, 소성 변형에 의해 제품이 가공 경화되고 조직이 치밀해지기 때문에 기계적 강도가 크게 향상되기 때문이다.In the present invention, the molding of the screw part by rolling is because the mechanical strength is greatly improved because the fiber structure of the material is not cut as shown in FIG. 5, and the product is processed and cured by the plastic deformation and the structure becomes dense.

그리고 상기 나사부를 가공함에 있어서는 둥근나사로 가공하게 되는데, 이는 도 6에 나타난 바와 같이, 나사산의 단면이 둥근형으로 사다리꼴 나사와 같이 치근 부분이 두껍게 이루어짐으로써, 저항력이 크고 노치현상이 발생되지 않음은 물론 체결성이 좋아 먼지, 모래 등이 많은 건설현장에서 용이하게 체결할 수 있기 때문이다.In the processing of the screw portion, the round screw is processed. As shown in FIG. 6, the cross section of the thread is round, and the tooth root portion is made thick such as a trapezoidal screw, so that the resistance is large and notch phenomenon is of course fastened. This is because it is easy to fasten at construction sites with a lot of dust and sand.

또한, 상기 둥근 나사의 피치를 일반 나사보다 좁게 하면 체결력 및 강도를 향상시킬 수 있음은 물론 진동이 많이 발생하더라도 이완될 염려가 없게 된다.In addition, when the pitch of the round screw is narrower than the general screw, the tightening force and strength can be improved, and there is no fear of relaxation even if a lot of vibration occurs.

그리고 상기 연결부(8)에 둥근 나사를 성형함에 있어서는 나사산 지름 d1을 콘크리트 보강용 이형봉강(2)의 원주형 리브(4)의 바깥지름 d2와 동일하게 하거나 작게 형성한다.In forming the round screw in the connecting portion 8, the thread diameter d1 is equal to or smaller than the outer diameter d2 of the columnar rib 4 of the release bar steel 2 for concrete reinforcement.

이는 연결부분의 기계적 강도가 높기 때문이며, 노치현상이 발생되지 않기 때문이다.This is because the mechanical strength of the connecting portion is high, and the notch phenomenon does not occur.

이상에서와 같이 본 발명에 의하면, 건설, 토목 현장에서 사용되는 콘크리트 보강용 이형봉강의 연결부의 철근 조직을 파괴시키지 않고 가공할 수 있도록 하여 이의 연결부에 대한 기계적 강도를 향상시킬 수 있게 된다.As described above, according to the present invention, it is possible to process without destroying the reinforcing bar structure of the connecting portion of the reinforcing bar for concrete reinforcement used in construction, civil engineering site it is possible to improve the mechanical strength of the connecting portion.

그리고 둥근나사로 이루어지게 되는 바, 체결이 용이하게 이루어져 연결작업을 매우 용이하며, 공기단축과 비용을 절감시킬 수 있는 발명인 것이다.And it is made of a round screw, it is easy to fasten the connection work is very easy, it is an invention that can reduce the air shortening and cost.

도 1은 가공전의 콘크리트 보강용 이형봉강의 연결부 정면도.1 is a front view of the connection portion of the release bar for reinforcing concrete before processing.

도 2는 1차 가공된 상태의 콘크리트 보강용 이형봉강의 연결부 정면도.Figure 2 is a front view of the connecting portion of the release bar for reinforcement of concrete in the primary processed state.

도 3은 1차 가공된 연결부를 형단조하는 상태를 보인 도면.3 is a view showing a state in which the forging of the primary processed connecting portion.

도 4는 본 발명에 의하여 가공이 완료된 상태의 콘크리트 보강용 이형봉강의 연결부 정면도.Figure 4 is a front view of the connecting portion of the release bar for reinforcement of concrete in the state of completion of processing according to the present invention.

도 5는 콘크리트 보강용 이형봉강의 연결부의 재료섬유조직의 단류선(Grain flow)을 설명하기 위한 단면도이다.5 is a cross-sectional view for explaining the flow flow (Grain flow) of the material fiber structure of the connection portion of the release bar for concrete reinforcement.

도 6은 본 발명의 콘크리트 보강용 이형봉강의 연결부가 커플러에 연결된 상태를 나타낸 단면도이다.Figure 6 is a cross-sectional view showing a state in which the connection portion of the release bar for concrete reinforcement of the present invention is connected to the coupler.

Claims (3)

콘크리트 보강용 이형봉강의 연결부 범위내에 있는 원주형 리브와 길이방향 리브를 제거하는 제 1공정과;A first step of removing columnar ribs and longitudinal ribs within a range of a joint of a reinforcing bar for concrete reinforcement; 상기 제 1공정을 거친 연결부를 형단조 금형에 삽입시켜 상온 형단조시키는 제 2공정과;A second step of inserting the connection part which passed through the said 1st process into a die-forging die, and forging at room temperature; 상기 제 2공정에서 상온 형단조 성형된 연결부의 외주면에 전조작업으로 둥근나사를 성형하는 제 3공정;A third step of forming a round screw by a rolling operation on an outer circumferential surface of the connection part forged at room temperature in the second step; 을 포함하여 이루어지는 콘크리트 보강용 이형봉강의 연결부 가공방법.Connecting part processing method of the release bar for concrete reinforcement comprising a. 청구항 1에 있어서, 둥근 나사는 나사산 지름 d1와, 콘크리트 보강용 이형봉강의 원주형 리브 바깥지름 d2가, d1 ≤ d2이 되도록 형성함을 특징으로 하는 콘크리트 보강용 이형봉강의 연결부 가공방법.The method according to claim 1, wherein the round screw is formed so that the thread diameter d1 and the circumferential rib outer diameter d2 of the reinforcing bar for concrete reinforcement are d1 ≤ d2. 청구항 1에 있어서, 제 2공정에서는 연결부의 단면적을 콘크리트 보강용 이형봉강의 유효 단면적과 동일하거나 크게 상온에서 형단조를 실시함을 특징으로 하는 콘크리트 보강용 이형봉강의 연결부 가공방법.The method according to claim 1, wherein in the second step, the cross-sectional area of the connection part is forged at room temperature at the same or greater than the effective cross-sectional area of the reinforcing bar for concrete reinforcement.
KR1019980013131A 1998-04-13 1998-04-13 Connection structure of reinforcing bar for concrete reinforcement and processing method of the connection KR100515204B1 (en)

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JPH0657883A (en) * 1992-01-24 1994-03-01 Erico Internatl Corp Bar splice for reinforcement and sleeve and manufacture of sleeve and bar connection structure
US5660594A (en) * 1992-06-01 1997-08-26 Tartuntamarkkinointi Oy Method of making a threaded connection for reinforcing bars
JPH09302845A (en) * 1996-05-16 1997-11-25 Nippon Katan Kk Mechanical reinforcement joint
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JPS59113948A (en) * 1982-12-17 1984-06-30 Nippon Biyouratei Seisakusho:Kk Manufacture of anchor bolt
JPH0657883A (en) * 1992-01-24 1994-03-01 Erico Internatl Corp Bar splice for reinforcement and sleeve and manufacture of sleeve and bar connection structure
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JPH09302845A (en) * 1996-05-16 1997-11-25 Nippon Katan Kk Mechanical reinforcement joint
JPH1037386A (en) * 1996-07-24 1998-02-10 Kyoei Seiko Kk Deformed steel bar having joint and used for reinforced concrete, the joint, and forming method for joint of deformed steel bar used for reinforced concrete
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KR100316435B1 (en) * 1998-03-31 2001-12-12 정경옥 Method of working connection end of deformed bar for reinforcing concrete, deformed bar worked by the method and structure of connecting deformed bar

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