WO2016032143A1 - Deformed bar for improving bond strength - Google Patents

Deformed bar for improving bond strength Download PDF

Info

Publication number
WO2016032143A1
WO2016032143A1 PCT/KR2015/008236 KR2015008236W WO2016032143A1 WO 2016032143 A1 WO2016032143 A1 WO 2016032143A1 KR 2015008236 W KR2015008236 W KR 2015008236W WO 2016032143 A1 WO2016032143 A1 WO 2016032143A1
Authority
WO
WIPO (PCT)
Prior art keywords
bar
nodes
node
protrusions
deformed
Prior art date
Application number
PCT/KR2015/008236
Other languages
French (fr)
Korean (ko)
Inventor
최완철
Original Assignee
숭실대학교산학협력단
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 숭실대학교산학협력단 filed Critical 숭실대학교산학협력단
Publication of WO2016032143A1 publication Critical patent/WO2016032143A1/en

Links

Images

Classifications

    • 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

Definitions

  • the adhesion strength is greatly improved over the entire length of the deformed steel bar, thereby improving adhesion to concrete. It's about a deformed rebar.
  • Reinforcing bars are used to supplement concrete that is weak in tensile strength in reinforced concrete structures, and are classified into circular reinforcing bars, deformed reinforcing bars, and special reinforcing bars.
  • Double deformed reinforcing bar is to strengthen the adhesion to the concrete by placing the projections such as nodes (2), ribs (3) on the surface of the circular bar (1) as shown in Figure 1, the bar (2)
  • a plurality of protrusions are formed on the outer circumferential surface of the bar 1 so as to be spaced apart at regular intervals along the longitudinal direction, and ribs 3 are formed to protrude over the entire length of the bar 1 along the longitudinal direction of the bar 1.
  • the bond strength is the resistance to pullout due to local shear failure and the splitting failure of the concrete cover between the concrete in contact with the node (2). It consists of resistance to.
  • the shear fracture surface forms a wedge from the tip of the node 2 toward the surface of the steel bar 1 and splits. Splitting failures occur.
  • the bar height (h) and the spacing (s) between adjacent bars of a conventional deformed bar are defined in the Korean Industrial Standard, which is similar in foreign standards.
  • the above regulations are proposed to ensure even distribution of stress and sufficient adhesion to the concrete.
  • the conventional regulations are rather obstacles in improving the adhesion performance and crack control effect between concrete and deformed steel.
  • the concept of node area ratio is introduced to calculate the ratio of the height and spacing between the adjacent adjacent nodes where pull fracture and split fracture do not occur.
  • the section area ratio is in the range of 0.10 to 0.14 so that a deformed steel bar having a higher section area ratio is used.
  • the relative rib area (R r ) is related to the ratio of bearing area to shearing area.
  • the acupressure area is shown in FIG. 3 (a) as the area resisting pull fracture when a tensile force is applied to the reinforcing bar, and the shear area is shown in FIG. 3 (b) as the area resisting the split fracture.
  • the bond strength is increased as compared with the conventional deformed reinforcing bar, but as the node area ratio increases, the increase in the bond strength is weak and limited.
  • the shear failure surface generated in the first node 12 can be adjusted to be generated beyond the neighboring second node 13, thereby increasing the area of the shear failure surface and increasing the adhesive strength.
  • the cross-sectional area of the reinforcing bar is not constant along the longitudinal direction of the deformed bar, the tensile stress acting on the reinforcing bar in the section with the node is smaller than the section without the section. This stress reduction is more pronounced at the point where the first node 12 with the high height is located.
  • the adhesive stress transmitted to the concrete may not be evenly transmitted, and the local adhesive stress may be excessively transmitted, resulting in local attachment failure and partial crack width increase.
  • the nodes are not evenly distributed in the axial direction, the energy consumption increases in the production process in forming the first node 12 having a high height.
  • the section forming the section is reused many times, because the section is distributed evenly in the axial direction is not produced, the mold damage of the high first section 12 is faster and therefore the replacement time of the section There was a problem that is shortened.
  • the present invention is to provide a reinforcing reinforcing reinforcing bar that can improve the adhesion performance with the concrete is greatly improved the adhesive strength over the entire length of the deformed steel regardless of the position of the bar.
  • the present invention can reduce the energy consumption due to the increase in the production energy is pressed to the bar in the rebar production process, and provides a reinforced reinforcing bar that can extend the replacement of the bar due to delayed damage of the bar I would like to.
  • a bar having a circular cross section; A first node protruding from the plurality of bars on the outer circumferential surface of the bar; And a second node having a plurality of which protrudes from the outer circumferential surface of the steel bar, the second node being disposed between adjacent first nodes and having a lower height than the first node.
  • the first and second nodes are formed to be inclined at an angle with a longitudinal axis of the steel bar, and ribs are formed in the longitudinal direction on both sides of the steel bar, respectively, and the first and second nodes are ribs.
  • the first and second nodes provide an adhesive force-reinforced deformed reinforcing bar, characterized in that the upper and lower parts are formed to be inclined in a symmetrical direction.
  • the first and second nodes provide a reinforced reinforced deformed reinforcing bar, characterized in that the upper and lower portions are inclined in the same direction.
  • the sum of the node area ratio of the first node and the node area ratio of the second node provides 0.1 to 0.14 or less of the adhesion-strengthening reinforced reinforcing bars.
  • the present invention according to another preferred embodiment provides an adhesive force-enhanced deformed reinforcing bar, characterized in that the angle ( ⁇ ) between the line connecting the upper end of the first and second nodes and the deformed rebar axis is 15 degrees or less.
  • the first and second nodes inclined at an angle to the longitudinal axis of the steel bar, it is possible to distribute the nodes evenly over the entire length of the reinforcing bars, thereby evenly distributing the stress acting on the reinforcing bars over the entire length of the reinforcing bars. Therefore, local attachment failure can be prevented, and the adhesion strength is greatly improved, thereby improving the adhesion performance and the crack resistance ability with concrete, thereby increasing the durability of the reinforced concrete structure.
  • the first node with a high height is evenly distributed in the axial direction, energy consumption due to energy pressurized on the bottle in the production process can be reduced, and damage to the bottle is delayed, thereby extending the replacement time of the bottle. can do.
  • FIG. 1 is a perspective view showing an embodiment of a conventional deformed bar.
  • FIG. 2 is a side cross-sectional view of a deformed bar showing various failure modes occurring at the shear failure surface according to the spacing between adjacent nodes.
  • FIG. 1 is a cross-sectional view of the rebar showing the acupressure area
  • Figure 3 (b) is a side view of the rebar showing the shear area.
  • Figure 4 is a perspective view showing another embodiment of a conventional deformed bar.
  • FIG. 5 is a perspective view showing an embodiment of the present invention adhesion-strengthening reinforced bar.
  • FIG. 6 is a side view of FIG. 5.
  • FIG. 7 is a cross-sectional view taken along line AA ′ of FIG. 5;
  • Figure 9 is a perspective view showing another embodiment of the present invention adhesion strengthening reinforced steel.
  • FIG. 10 is a side view of FIG. 9;
  • FIG. 11 is a cross-sectional view taken along line BB ′ of FIG. 9.
  • FIG. 12 is a perspective view showing a part of the present invention adhesion strengthening reinforced steel.
  • the present invention has a circular cross section (11); A plurality of first bars 12 protruding from the bar 11 to be spaced apart from each other by a predetermined distance; And a second node 13 having a plurality of protruding portions on the outer circumferential surface of the bar 11 and disposed between the adjacent first nodes 12 and having a height lower than that of the first nodes 12.
  • the first node 12 and the second node 13 are formed to be inclined at an angle with a longitudinal axis of the bar 11, and ribs 14 in the longitudinal direction on both sides of the bar 11.
  • the first and second nodes 12 and 13 are divided into upper and lower parts based on the ribs 14, and the first and second nodes 12 and 13 are formed. Is positioned one each in the upper and lower portions on the same cross-section is characterized in that the cross-sectional area is the same over the entire length of the deformed bar.
  • FIG. 5 is a perspective view showing an embodiment of the present invention, the adhesion-strengthening reinforced steel, Figure 6 is a side development of Figure 5, Figure 7 is a cross-sectional view taken along line AA 'of FIG.
  • FIG. 9 is a perspective view showing another embodiment of the present invention, the adhesion-strengthening reinforced bar, Figure 10 is a side development of Figure 9, Figure 11 is a cross-sectional view taken along line BB 'of FIG.
  • the adhesion-strengthening deformed reinforcing bar of the present invention is a bar 11 of circular cross section; A plurality of first bars 12 protruding from the bar 11 to be spaced apart from each other by a predetermined distance; And a second node 13 having a plurality of protruding portions on the outer circumferential surface of the bar 11 and disposed between the adjacent first nodes 12 and having a height lower than that of the first nodes 12.
  • the first node 12 and the second node 13 are formed to be inclined at an angle with a longitudinal axis of the bar 11, and ribs 14 in the longitudinal direction on both sides of the bar 11.
  • first and second nodes 12 and 13 are divided into upper and lower parts based on the ribs 14, and the first and second nodes 12 and 13 are formed. Is positioned one each in the upper and lower portions on the same cross-section is characterized in that the cross-sectional area is the same over the entire length of the deformed bar.
  • the bar 11 has a long rod shape, and may be manufactured using materials such as steel, high tensile strength steel, and fiber reinforced composites.
  • the first and second nodes 12 and 13 may protrude to the outer circumferential surface of the bar 11, but may have different heights protruding from each other, and may be alternately spaced apart from each other along the longitudinal direction of the bar 11 on the outer circumferential surface of the bar 11. Alternately placed.
  • the first and second nodes 12 and 13 prevent the deformed bar from moving in the axial direction of the bar 11 when the deformed bar is embedded in the concrete.
  • the first and second nodes 12 and 13 are formed to be inclined at a predetermined angle with the longitudinal axis of the bar 11. Therefore, by arranging the nodes inclinedly, the area of the nodes can be more evenly distributed over the entire length of the deformed rebar, thereby supporting the tensile stress.
  • first and second nodes 12 and 13 are positioned at the top and the bottom, respectively, on the same cross section so as to have the same cross-sectional area over the entire length of the deformed bar.
  • first and second nodes 12 and 13 may be disposed so as not to overlap or break portions over the entire length of the reinforcing bar in the longitudinal direction, and as shown in FIGS. 7 and 11. , Two nodes 12, 13 are located.
  • the first node 12, which is a high node, and the second node 13, which is a low node, are alternately arranged to increase adhesion strength, while concentrated stress occurs at a portion having a small cross-section, and thus the attachment stress cannot be transmitted evenly.
  • the problem of destruction can be solved.
  • the axial direction of the deformed bar means the longitudinal center line of the deformed bar.
  • Ribs 14 are formed on both sides of the bar 11 in the longitudinal direction, respectively, and the first and second nodes 12 and 13 are divided into upper and lower parts based on the ribs 14. do.
  • each of the first and second nodes 12 and 13 extends with a constant inclination angle along the upper outer circumferential surface of the bar 11 with the one side rib 14 as a starting point to reach the other side rib 14.
  • the first and second nodes 12 and 13 extend along the lower outer circumferential surface of the steel bar 11 with the other side ribs 14 as a starting point, respectively, to reach the one side ribs 14.
  • the rib 14 further increases the attachment area with the concrete and supports the first and second nodes 12 and 13 to improve the adhesion with the concrete.
  • the ribs 14 are formed on both sides facing each other in the cross section of the bar 11, as can be seen in Figures 5 and 9.
  • the lower portion of the first node 12 may be formed to cross and protrude from each other so that the second node 13 is disposed.
  • the first and second nodes 12 and 13 are formed to be inclined in a direction in which the upper and lower parts are symmetrical with each other, or in the embodiments of FIGS. 9 to 11.
  • the first and second nodes 12 and 13 may be formed to have an upper portion and a lower portion inclined in the same direction.
  • the sum of the node area ratio of the first node 12 and the node area ratio of the second node 13 may be configured to be 0.1 or more and 0.14 or less.
  • the nodal area ratio is in the range of 0.10 to 0.14 as in the ACI standard, it is possible to obtain a high bond strength by maintaining a higher nodal area ratio than the conventional one without pulling fracture and splitting fracture.
  • the relative rib area (R r ) means the ratio of the bearing area to the shearing area, and the bearing area and the shear area are respectively shown in FIGS. It can be calculated as
  • FIG. 8A illustrates an embodiment of the deformed rebar shown in FIG. 4, in which the high and low nodes are alternately spaced apart from each other along the longitudinal direction of the deformed rebar.
  • the rebar cross-sectional area is also formed high and low protruding portion along the longitudinal direction of the reinforcing bar, it can be seen that the tensile stress acting on the reinforcing bar is not evenly distributed.
  • Figure 8 (b) is for the embodiment of the deformed reinforcing bar according to the present invention, in the present invention, the first and second nodes (12, 13) having different heights along the longitudinal direction of the deformed reinforcing bar 11 ) Is formed with a longitudinal axis and a constant inclination angle.
  • the lines connecting the positions where the first and second nodes 12 and 13 begin and the ends of the first and second nodes 12 and 13 are adjacent to the axial direction of the deformed rebar, respectively,
  • the rebar cross-sectional area is the same over the entire length of the deformed bar as shown in FIG.
  • FIG. 12 is a perspective view showing a part of the present invention adhesion-strengthening reinforced bar.
  • the angle ⁇ between the line connecting the upper ends of the first and second nodes 12 and 13 and the deformed rebar axis may be 15 degrees or less.
  • the shear fracture surface is usually at an angle of 15 degrees with the reinforcing bar surface. As described above, when the angle ( ⁇ ) between the line connecting the upper ends of the first and second nodes 12 and 13 and the deformed rebar axis is limited. The shear fracture surface is not disconnected by the second node 13.
  • the area of the shear failure surface can be made as wide as possible, thereby increasing the adhesive strength.
  • the present invention is industrial in that the adhesive strength-reinforced deformed reinforcing bar of the present invention can improve the adhesion performance and crack resistance ability with concrete by uniformly distributing stress over the entire length of the rebar, thereby increasing the durability of the reinforced concrete structure. There is possibility.
  • the present invention has industrial applicability in that the damage of the header in the production process can be reduced to prolong the replacement time of the header.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The present invention relates to a deformed bar for improving bond strength, which forms a plurality of first and second protrusions having different heights and being slanted at a certain angle, thereby significantly enhancing the bond strength on the whole length of the deformed bar and enhancing bond performance to concrete. The deformed bar for improving bond strength of the present invention comprises: a steel rod having a circular cross section; a plurality of first protrusions which protrude on the outer circumferential surface of the steel rod so as to be spaced apart from each other at certain intervals; and a plurality of second protrusions which protrude on the outer circumferential surface of the steel rod, are disposed between adjacent first protrusions, and have a lower height than the first protrusions. The first protrusions and second protrusions are formed to be slanted at a certain angle with respect to the longitudinal axis of the steel rod. The steel rod has, on both side surfaces thereof, ribs formed in the longitudinal direction. The first protrusions and the second protrusions are respectively formed at the upper portion and lower portion of the ribs, and one first protrusion and one second protrusion are positioned on the upper portion and the lower portion of the ribs on the same cross section, so that the whole length of the deformed bar has the same cross sectional area.

Description

부착력 강화 이형철근Adhesion Reinforcement
본 발명은 봉강의 외주면에 서로 높이가 다른 제1, 2마디를 일정 각도 경사지게 복수 개 형성함으로써, 이형철근의 전 길이에 거쳐 부착강도가 크게 향상되어 콘크리트와의 부착성능을 향상시킬 수 있는 부착력 강화 이형철근에 대한 것이다.According to the present invention, by forming a plurality of first and second nodes having different heights on the outer circumferential surface of the steel bar at an angle, the adhesion strength is greatly improved over the entire length of the deformed steel bar, thereby improving adhesion to concrete. It's about a deformed rebar.
철근은 철근콘크리트구조 등에서 인장력에 약한 콘크리트를 보완하기 위하여 사용되는 것으로, 원형철근, 이형철근, 특수철근 등으로 구분된다.Reinforcing bars are used to supplement concrete that is weak in tensile strength in reinforced concrete structures, and are classified into circular reinforcing bars, deformed reinforcing bars, and special reinforcing bars.
이중 이형철근은 도 1에서와 같이 원형 봉강(1) 표면에 마디(2)나 리브(3) 등의 돌기를 위치시켜 콘크리트와의 부착력을 강화시킨 것으로, 마디(2)는 봉강(1)의 길이 방향을 따라 일정 간격 이격되도록 봉강(1)의 외주면에 돌출되어 복수 개 형성되고, 리브(3)는 봉강(1)의 길이 방향을 따라 봉강(1)의 전 길이에 걸쳐 돌출 형성된다. Double deformed reinforcing bar is to strengthen the adhesion to the concrete by placing the projections such as nodes (2), ribs (3) on the surface of the circular bar (1) as shown in Figure 1, the bar (2) A plurality of protrusions are formed on the outer circumferential surface of the bar 1 so as to be spaced apart at regular intervals along the longitudinal direction, and ribs 3 are formed to protrude over the entire length of the bar 1 along the longitudinal direction of the bar 1.
철근이 콘크리트에 묻혀 정착될 때, 부착강도는 마디(2)와 접촉되는 콘크리트 사이에 국부 전단 파괴(local shear failure)로 인한 뽑힘(pullout)에 대한 저항력과 콘크리트 피복의 쪼갬 파괴(splitting failure)에 대한 저항력으로 구성된다.When the reinforcing bar is buried and settled in concrete, the bond strength is the resistance to pullout due to local shear failure and the splitting failure of the concrete cover between the concrete in contact with the node (2). It consists of resistance to.
그러나 도 2의 (a)에서 볼 수 있는 바와 같이 이형철근에서는 인접 마디(2) 사이의 간격(s)이 좁은 경우, 마디(2) 사이를 메우는 콘크리트의 면적이 작다. 따라서 전단 파괴면이 마디(2)와 마디(2)를 잇는 선형의 형태를 나타내어, 철근이 콘크리트로부터 쉽게 뽑히는 뽑힘 파괴(pull out failure)가 발생한다.However, as can be seen in Figure 2 (a), in the reinforcing bar, when the space (s) between the adjacent nodes 2 is narrow, the area of the concrete filling between the nodes 2 is small. Thus, the shear failure surface exhibits a linear form connecting the nodes 2 and 2, causing pull out failure in which the rebar is easily pulled out of the concrete.
또한, 도 2의 (b)에서와 같이 인접 마디(2) 사이의 간격(s)이 넓은 경우, 전단 파괴면이 마디(2)의 선단에서 봉강(1)의 표면을 향하는 쐐기를 형성하여 쪼갬 파괴(splitting failure)가 발생한다.In addition, when the distance s between adjacent nodes 2 is wide as shown in FIG. 2 (b), the shear fracture surface forms a wedge from the tip of the node 2 toward the surface of the steel bar 1 and splits. Splitting failures occur.
종래 이형철근의 마디 높이(h) 및 인접 마디 사이의 간격(s)은 한국산업규격(Korean Industrial Standard)에 규정되어 있으며, 이는 외국의 규격에서도 유사하다. The bar height (h) and the spacing (s) between adjacent bars of a conventional deformed bar are defined in the Korean Industrial Standard, which is similar in foreign standards.
상기 규정은 콘크리트와의 부착에 있어 응력의 고른 분배와 충분한 부착력 확보를 위하여 제안된 것이다. 그러나 종래의 규정들은 오히려 콘크리트와 이형철근과의 부착성능과 균열 제어 효과를 향상시키는데 장애로 작용하고 있다.The above regulations are proposed to ensure even distribution of stress and sufficient adhesion to the concrete. However, the conventional regulations are rather obstacles in improving the adhesion performance and crack control effect between concrete and deformed steel.
또한, 뽑힘 파괴와 쪼갬 파괴가 일어나지 않는 최적의 인접 마디 사이의 간격 및 높이의 비를 산정하기 위한 마디면적비의 개념이 도입되다. ACI 규준에서는 마디면적비가 0.10~0.14 사이의 범위에 있도록 하여 종래에 비하여 높은 마디면적비를 갖는 이형철근을 사용하도록 하고 있다. Also, the concept of node area ratio is introduced to calculate the ratio of the height and spacing between the adjacent adjacent nodes where pull fracture and split fracture do not occur. According to the ACI standard, the section area ratio is in the range of 0.10 to 0.14 so that a deformed steel bar having a higher section area ratio is used.
상기 마디면적비(relative rib area, Rr)는 전단면적(shearing area)에 대한 지압면적(bearing area)의 비와 관계된다.The relative rib area (R r ) is related to the ratio of bearing area to shearing area.
상기 지압면적은 철근에 인장력이 작용할 때 뽑힘 파괴에 저항하는 면적으로 도 3의 (a)에 도시되고, 전단면적은 쪼갬 파괴에 저항하는 면적으로 도 3의 (b)에 도시된다.The acupressure area is shown in FIG. 3 (a) as the area resisting pull fracture when a tensile force is applied to the reinforcing bar, and the shear area is shown in FIG. 3 (b) as the area resisting the split fracture.
그러나 마디면적비를 제한하더라도 종래의 이형철근에 비하여 부착강도는 증가하나 마디면적비가 증가할수록 부착강도의 증가가 미약하고 제한적이다.However, even if the section area ratio is limited, the bond strength is increased as compared with the conventional deformed reinforcing bar, but as the node area ratio increases, the increase in the bond strength is weak and limited.
아울러 마디 높이가 증가함에 따라 철근 정착에 필요한 콘크리트의 두께가 얇아지는 경우, 증가한 정착 길이 또는 이음 길이에 따라 철근의 과밀을 초래하여 콘크리트 타설 등의 공사에 어려움이 있다.In addition, when the thickness of the concrete required for reinforcing bar becomes thinner as the height of the bar increases, it causes difficulty in construction such as concrete placing due to overcrowding of the reinforcing bar according to the increased fixing length or joint length.
이에 따라 도 4에서와 같이 봉강(11)의 길이 방향을 따라 높이가 높은 제1마디(12)와 높이가 낮은 제2마디(13)가 교대로 위치되는 이형철근이 개발되었다(공개특허 제10-2012-0067113호).As a result, as shown in FIG. 4, a deformed steel bar in which the first node 12 having a higher height and the second node 13 having a lower height are alternately positioned in the longitudinal direction of the steel bar 11 has been developed. -2012-0067113).
상기 선행기술에서는 제1마디(12)에서 발생한 전단 파괴면이 이웃하는 제2마디(13)를 넘어 발생하도록 조절할 수 있어 전단 파괴면의 면적이 넓어져 부착강도가 증가하는 효과가 있다. In the prior art, the shear failure surface generated in the first node 12 can be adjusted to be generated beyond the neighboring second node 13, thereby increasing the area of the shear failure surface and increasing the adhesive strength.
그러나 철근 단면적이 이형철근의 길이 방향을 따라 일정하지 않으므로, 마디가 없는 부분에 비하여 마디가 있는 부분에서 철근에 작용하는 인장응력이 작아진다. 그리고 이러한 응력 감소는 높이가 높은 제1마디(12)가 위치한 지점에서 더욱 두드러진다.However, since the cross-sectional area of the reinforcing bar is not constant along the longitudinal direction of the deformed bar, the tensile stress acting on the reinforcing bar in the section with the node is smaller than the section without the section. This stress reduction is more pronounced at the point where the first node 12 with the high height is located.
따라서 콘크리트에 전달되는 부착응력 또한 고르게 전달되지 못하고, 국부적으로 부착응력이 과다하게 전달되어 결과적으로 국부적인 부착파괴 유발 및 부분적인 균열 폭 증가 등의 문제를 수반할 수 있다. Therefore, the adhesive stress transmitted to the concrete may not be evenly transmitted, and the local adhesive stress may be excessively transmitted, resulting in local attachment failure and partial crack width increase.
아울러 상기 선행기술은 마디가 축 방향으로 고르게 분포되지 않기 때문에, 높이가 높은 제1마디(12)를 성형하는데 있어 생산 공정에서 상대적으로 에너지 소비가 증가하게 된다. 뿐만 아니라, 마디를 성형하는 마디틀은 여러 번 재사용하게 되는데, 마디가 축 방향으로 고르게 분포되어 생산되지 않게 되기 때문에, 높이가 높은 제1마디(12)의 형틀 손상이 빨라지고 따라서 마디틀의 교체 시기가 단축되는 문제점이 있었다.In addition, in the prior art, because the nodes are not evenly distributed in the axial direction, the energy consumption increases in the production process in forming the first node 12 having a high height. In addition, the section forming the section is reused many times, because the section is distributed evenly in the axial direction is not produced, the mold damage of the high first section 12 is faster and therefore the replacement time of the section There was a problem that is shortened.
상기와 같은 문제를 해결하기 위하여 본 발명은 마디의 위치에 관계없이 이형철근의 전 길이에 거쳐 부착강도가 크게 향상되어 콘크리트와의 부착성능을 향상시킬 수 있는 부착력 강화 이형철근을 제공하고자 한다.In order to solve the problems described above, the present invention is to provide a reinforcing reinforcing reinforcing bar that can improve the adhesion performance with the concrete is greatly improved the adhesive strength over the entire length of the deformed steel regardless of the position of the bar.
또한, 본 발명은 이형철근 생산 공정에서 마디틀에 가압되는 생산 에너지 증가로 인한 에너지 소비를 감소시킬 수 있고, 마디틀의 손상 지연으로 마디틀의 교체 시기를 연장할 수 있는 부착력 강화 이형철근을 제공하고자 한다.In addition, the present invention can reduce the energy consumption due to the increase in the production energy is pressed to the bar in the rebar production process, and provides a reinforced reinforcing bar that can extend the replacement of the bar due to delayed damage of the bar I would like to.
바람직한 실시예에 따른 본 발명은 단면이 원형인 봉강; 복수 개가 봉강 외주면에 상호 일정 간격 이격되도록 돌출되는 제1마디; 및 복수 개가 봉강 외주면에 돌출되는 것으로 인접하는 제1마디의 사이에 배치되고 제1마디보다 높이가 낮은 제2마디; 로 구성되되, 상기 제1마디와 제2마디는 봉강의 길이 방향 축과 일정 각도 경사지게 형성되고, 상기 봉강의 양 측면에는 길이 방향으로 리브가 각각 형성되고, 상기 제1마디 및 제2마디는 리브를 기준으로 상부와 하부로 분할되어 형성되며, 상기 제1마디 및 제2마디가 동일 단면상에 상부와 하부에 각각 하나씩 위치하도록 하여 이형철근의 전 길이에 걸쳐 단면적이 동일한 것을 특징으로 하는 부착력 강화 이형철근을 제공한다.According to a preferred embodiment of the present invention, there is provided a bar having a circular cross section; A first node protruding from the plurality of bars on the outer circumferential surface of the bar; And a second node having a plurality of which protrudes from the outer circumferential surface of the steel bar, the second node being disposed between adjacent first nodes and having a lower height than the first node. The first and second nodes are formed to be inclined at an angle with a longitudinal axis of the steel bar, and ribs are formed in the longitudinal direction on both sides of the steel bar, respectively, and the first and second nodes are ribs. It is formed by dividing the upper and lower parts as a reference, and the first and second nodes are located in the upper and lower parts on the same section, respectively, so that the cross-sectional area over the entire length of the deformed reinforcing bar reinforced reinforcement characterized in that the same To provide.
다른 바람직한 실시예에 따른 본 발명은 상기 제1마디 및 제2마디는 상부와 하부가 서로 대칭되는 방향으로 경사지게 형성되는 것을 특징으로 하는 부착력 강화 이형철근을 제공한다.According to another exemplary embodiment of the present invention, the first and second nodes provide an adhesive force-reinforced deformed reinforcing bar, characterized in that the upper and lower parts are formed to be inclined in a symmetrical direction.
다른 바람직한 실시예에 따른 본 발명은 상기 제1마디 및 제2마디는 상부와 하부가 서로 동일한 방향으로 경사지게 형성되는 것을 특징으로 하는 부착력 강화 이형철근을 제공한다.According to another exemplary embodiment of the present invention, the first and second nodes provide a reinforced reinforced deformed reinforcing bar, characterized in that the upper and lower portions are inclined in the same direction.
다른 바람직한 실시예에 따른 본 발명은 상기 제1마디의 마디면적비와 제2마디의 마디면적비의 합은 0.1 이상 0.14 이하인 것을 특징으로 하는 부착력 강화 이형철근을 제공한다.According to another exemplary embodiment of the present invention, the sum of the node area ratio of the first node and the node area ratio of the second node provides 0.1 to 0.14 or less of the adhesion-strengthening reinforced reinforcing bars.
다른 바람직한 실시예에 따른 본 발명은 상기 제1마디와 제2마디의 상단을 연결한 선과 이형철근 축과의 각도(θ)는 15도 이하인 것을 특징으로 하는 부착력 강화 이형철근을 제공한다.The present invention according to another preferred embodiment provides an adhesive force-enhanced deformed reinforcing bar, characterized in that the angle (θ) between the line connecting the upper end of the first and second nodes and the deformed rebar axis is 15 degrees or less.
본 발명에 따르면 이형철근의 길이 방향을 따라 높이가 서로 다른 제1마디와 제2마디를 번갈아 위치시킴으로써 콘크리트와의 부착강도를 향상시킬 수 있다. According to the present invention, it is possible to improve adhesion strength with concrete by alternately placing the first and second nodes having different heights along the longitudinal direction of the reinforcing bar.
특히, 제1마디와 제2마디를 봉강의 길이 방향 축과 일정 각도 경사지게 배치함으로써, 철근의 전 길이에 마디를 고르게 분포시켜 철근에 작용하는 응력을 철근의 전 길이에 걸쳐 고르게 분배할 수 있다. 따라서 국부 부착파괴를 방지할 수 있고, 부착강도가 크게 향상되어 콘크리트와의 부착성능 및 균열저항능력을 향상시킬 수 있어 철근콘크리트 구조물의 내구성이 증가된다.In particular, by arranging the first and second nodes inclined at an angle to the longitudinal axis of the steel bar, it is possible to distribute the nodes evenly over the entire length of the reinforcing bars, thereby evenly distributing the stress acting on the reinforcing bars over the entire length of the reinforcing bars. Therefore, local attachment failure can be prevented, and the adhesion strength is greatly improved, thereby improving the adhesion performance and the crack resistance ability with concrete, thereby increasing the durability of the reinforced concrete structure.
아울러 콘크리트와의 부착성능 향상을 통하여 균열 저감은 물론 정착 길이 또는 이음 길이를 줄일 수 있다. 따라서 공사비 절감이 가능하고, 감소된 정착 길이를 통하여 철근의 밀집도를 줄일 수 있어 콘크리트 타설이 용이하다. In addition, it is possible to reduce cracking as well as fixation length or joint length by improving adhesion performance with concrete. Therefore, it is possible to reduce the construction cost and to reduce the density of rebar through the reduced anchoring length, so that it is easy to pour concrete.
또한, 높이가 높은 제1마디가 축 방향으로 고르게 분포되기 때문에, 생산 공정에서 마디틀에 가압되는 에너지로 인한 에너지 소비를 절감할 수 있고, 마디틀의 손상이 지연되므로 마디틀의 교체시기를 연장할 수 있다.In addition, since the first node with a high height is evenly distributed in the axial direction, energy consumption due to energy pressurized on the bottle in the production process can be reduced, and damage to the bottle is delayed, thereby extending the replacement time of the bottle. can do.
도 1은 종래 이형철근의 실시예를 도시하는 사시도.1 is a perspective view showing an embodiment of a conventional deformed bar.
도 2는 인접 마디 사이의 간격에 따라 전단 파괴면에서 일어나는 다양한 파괴 양상을 나타내는 이형철근의 측단면도.2 is a side cross-sectional view of a deformed bar showing various failure modes occurring at the shear failure surface according to the spacing between adjacent nodes.
도 3의 (a)는 지압면적을 나타내는 철근의 횡단면도이고, 도 3의 (b)는 전단면적을 나타내는 철근의 측면전개도.(A) is a cross-sectional view of the rebar showing the acupressure area, Figure 3 (b) is a side view of the rebar showing the shear area.
도 4는 종래 이형철근의 다른 실시예를 도시하는 사시도.Figure 4 is a perspective view showing another embodiment of a conventional deformed bar.
도 5는 본 발명 부착력 강화 이형철근의 실시예를 도시하는 사시도.5 is a perspective view showing an embodiment of the present invention adhesion-strengthening reinforced bar.
도 6은 도 5의 측면전개도.6 is a side view of FIG. 5.
도 7은 도 5의 A-A'에 따른 단면도.7 is a cross-sectional view taken along line AA ′ of FIG. 5;
도 8은 철근 길이에 따른 철근단면적을 나타내는 그래프.8 is a graph showing the rebar cross-sectional area according to the rebar length.
도 9는 본 발명 부착력 강화 이형철근의 다른 실시예를 도시하는 사시도.Figure 9 is a perspective view showing another embodiment of the present invention adhesion strengthening reinforced steel.
도 10은 도 9의 측면전개도.FIG. 10 is a side view of FIG. 9;
도 11은 도 9의 B-B'에 따른 단면도.FIG. 11 is a cross-sectional view taken along line BB ′ of FIG. 9.
도 12는 본 발명 부착력 강화 이형철근 일부를 도시하는 사시도.12 is a perspective view showing a part of the present invention adhesion strengthening reinforced steel.
상기와 같은 목적을 달성하기 위하여 본 발명은 단면이 원형인 봉강(11); 복수 개가 봉강(11) 외주면에 상호 일정 간격 이격되도록 돌출되는 제1마디(12); 및 복수 개가 봉강(11) 외주면에 돌출되는 것으로 인접하는 제1마디(12)의 사이에 배치되고 제1마디(12)보다 높이가 낮은 제2마디(13); 로 구성되되, 상기 제1마디(12)와 제2마디(13)는 봉강(11)의 길이 방향 축과 일정 각도 경사지게 형성되고, 상기 봉강(11)의 양 측면에는 길이 방향으로 리브(14)가 각각 형성되고, 상기 제1마디(12) 및 제2마디(13)는 리브(14)를 기준으로 상부와 하부로 분할되어 형성되며, 상기 제1마디(12) 및 제2마디(13)가 동일 단면상에 상부와 하부에 각각 하나씩 위치하도록 하여 이형철근의 전 길이에 걸쳐 단면적이 동일한 것을 특징으로 한다.In order to achieve the above object, the present invention has a circular cross section (11); A plurality of first bars 12 protruding from the bar 11 to be spaced apart from each other by a predetermined distance; And a second node 13 having a plurality of protruding portions on the outer circumferential surface of the bar 11 and disposed between the adjacent first nodes 12 and having a height lower than that of the first nodes 12. The first node 12 and the second node 13 are formed to be inclined at an angle with a longitudinal axis of the bar 11, and ribs 14 in the longitudinal direction on both sides of the bar 11. Are formed respectively, and the first and second nodes 12 and 13 are divided into upper and lower parts based on the ribs 14, and the first and second nodes 12 and 13 are formed. Is positioned one each in the upper and lower portions on the same cross-section is characterized in that the cross-sectional area is the same over the entire length of the deformed bar.
이하, 첨부한 도면 및 바람직한 실시예에 따라 본 발명을 상세히 설명한다. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
도 5는 본 발명 부착력 강화 이형철근의 실시예를 도시하는 사시도이고, 도 6은 도 5의 측면전개도이며, 도 7은 도 5의 A-A'에 따른 단면도이다.5 is a perspective view showing an embodiment of the present invention, the adhesion-strengthening reinforced steel, Figure 6 is a side development of Figure 5, Figure 7 is a cross-sectional view taken along line AA 'of FIG.
그리고 도 8은 길이에 따른 철근단면적을 나타내는 그래프이다.8 is a graph showing the rebar cross-sectional area along the length.
또한, 도 9는 본 발명 부착력 강화 이형철근의 다른 실시예를 도시하는 사시도이고, 도 10은 도 9의 측면전개도이며, 도 11은 도 9의 B-B'에 따른 단면도이다.9 is a perspective view showing another embodiment of the present invention, the adhesion-strengthening reinforced bar, Figure 10 is a side development of Figure 9, Figure 11 is a cross-sectional view taken along line BB 'of FIG.
도 5 및 도 9에서 볼 수 있는 바와 같이, 본 발명의 부착력 강화 이형철근은 단면이 원형인 봉강(11); 복수 개가 봉강(11) 외주면에 상호 일정 간격 이격되도록 돌출되는 제1마디(12); 및 복수 개가 봉강(11) 외주면에 돌출되는 것으로 인접하는 제1마디(12)의 사이에 배치되고 제1마디(12)보다 높이가 낮은 제2마디(13); 로 구성되되, 상기 제1마디(12)와 제2마디(13)는 봉강(11)의 길이 방향 축과 일정 각도 경사지게 형성되고, 상기 봉강(11)의 양 측면에는 길이 방향으로 리브(14)가 각각 형성되고, 상기 제1마디(12) 및 제2마디(13)는 리브(14)를 기준으로 상부와 하부로 분할되어 형성되며, 상기 제1마디(12) 및 제2마디(13)가 동일 단면상에 상부와 하부에 각각 하나씩 위치하도록 하여 이형철근의 전 길이에 걸쳐 단면적이 동일한 것을 특징으로 한다.As can be seen in Figures 5 and 9, the adhesion-strengthening deformed reinforcing bar of the present invention is a bar 11 of circular cross section; A plurality of first bars 12 protruding from the bar 11 to be spaced apart from each other by a predetermined distance; And a second node 13 having a plurality of protruding portions on the outer circumferential surface of the bar 11 and disposed between the adjacent first nodes 12 and having a height lower than that of the first nodes 12. The first node 12 and the second node 13 are formed to be inclined at an angle with a longitudinal axis of the bar 11, and ribs 14 in the longitudinal direction on both sides of the bar 11. Are formed respectively, and the first and second nodes 12 and 13 are divided into upper and lower parts based on the ribs 14, and the first and second nodes 12 and 13 are formed. Is positioned one each in the upper and lower portions on the same cross-section is characterized in that the cross-sectional area is the same over the entire length of the deformed bar.
상기 봉강(11)은 길이가 긴 막대 형상으로, 강재, 고장력 강재, 섬유보강복합체 등의 재질을 이용하여 제작될 수 있다. The bar 11 has a long rod shape, and may be manufactured using materials such as steel, high tensile strength steel, and fiber reinforced composites.
도 5 및 도 9의 실시예에서는 강재를 재질로 한 원형 단면의 봉강(11)을 이용하였다. 5 and 9 used a bar 11 of circular cross section made of steel.
상기 제1, 2마디(12, 13)는 봉강(11) 외주면으로 돌출되되 서로 돌출된 높이가 상이한 것으로, 봉강(11) 외주면에서 봉강(11)의 길이 방향을 따라 상호 일정 간격 이격되도록 교대로 번갈아 배치된다. The first and second nodes 12 and 13 may protrude to the outer circumferential surface of the bar 11, but may have different heights protruding from each other, and may be alternately spaced apart from each other along the longitudinal direction of the bar 11 on the outer circumferential surface of the bar 11. Alternately placed.
제1, 2마디(12, 13)는 이형철근이 콘크리트에 매립되는 경우, 콘크리트와의 경계면에서 이형철근이 봉강(11)의 축 방향으로 이동하지 않도록 한다. The first and second nodes 12 and 13 prevent the deformed bar from moving in the axial direction of the bar 11 when the deformed bar is embedded in the concrete.
상기 제1마디(12)와 제2마디(13)는 봉강(11)의 길이 방향 축과 일정 각도 경사지게 형성된다. 따라서 마디를 경사지게 배치하여 마디의 면적이 이형철근의 전 길이에 걸쳐 보다 골고루 분포되어 인장응력을 지지할 수 있다.The first and second nodes 12 and 13 are formed to be inclined at a predetermined angle with the longitudinal axis of the bar 11. Therefore, by arranging the nodes inclinedly, the area of the nodes can be more evenly distributed over the entire length of the deformed rebar, thereby supporting the tensile stress.
이때, 상기 제1마디(12) 및 제2마디(13)가 동일 단면상에 상부와 하부에 각각 하나씩 위치하도록 하여 이형철근의 전 길이에 걸쳐 단면적이 동일하도록 구성한다.In this case, the first and second nodes 12 and 13 are positioned at the top and the bottom, respectively, on the same cross section so as to have the same cross-sectional area over the entire length of the deformed bar.
이로써, 이형철근의 길이 방향 전 길이에 걸쳐 제1, 2마디(12, 13)가 중복되거나 끊기는 부분이 발생하지 않도록 배치할 수 있으며, 도 7 및 도 11에서와 같이 이형철근 전 단면에 제1, 2마디(12, 13)가 위치된다. As a result, the first and second nodes 12 and 13 may be disposed so as not to overlap or break portions over the entire length of the reinforcing bar in the longitudinal direction, and as shown in FIGS. 7 and 11. , Two nodes 12, 13 are located.
따라서 높은 마디인 제1마디(12)와 낮은 마디인 제2마디(13)를 번갈아 배치하여 부착강도를 증가시키는 한편, 단면적이 적은 부분에서 집중응력이 발생하여 부착응력이 고르게 전달되지 못하고 국부 부착파괴가 발생하는 문제를 해결할 수 있다.Therefore, the first node 12, which is a high node, and the second node 13, which is a low node, are alternately arranged to increase adhesion strength, while concentrated stress occurs at a portion having a small cross-section, and thus the attachment stress cannot be transmitted evenly. The problem of destruction can be solved.
여기에서 이형철근의 축 방향은 이형철근의 길이 방향 중심선을 의미한다. Here, the axial direction of the deformed bar means the longitudinal center line of the deformed bar.
상기 봉강(11)의 양 측면에는 길이 방향으로 리브(14)가 각각 형성되고, 상기 제1마디(12) 및 제2마디(13)는 리브(14)를 기준으로 상부와 하부로 분할되어 형성된다. Ribs 14 are formed on both sides of the bar 11 in the longitudinal direction, respectively, and the first and second nodes 12 and 13 are divided into upper and lower parts based on the ribs 14. do.
이로써, 제1, 2마디(12, 13)의 단부가 리브(14)의 일측에 위치되어 지지된다.As a result, end portions of the first and second nodes 12 and 13 are positioned and supported on one side of the rib 14.
즉, 제1, 2마디(12, 13)는 각각 일측 리브(14)를 시작점으로 하여 봉강(11)의 상부 외주면을 따라 일정한 경사각을 가지고 연장되어 타측 리브(14)에 도달한다. 그리고 제1, 2마디(12, 13)는 각각 타측 리브(14)를 시작점으로 하여 봉강(11)의 하부 외주면을 따라 일정한 경사각을 가지고 연장되어 일측 리브(14)에 도달한다. That is, each of the first and second nodes 12 and 13 extends with a constant inclination angle along the upper outer circumferential surface of the bar 11 with the one side rib 14 as a starting point to reach the other side rib 14. In addition, the first and second nodes 12 and 13 extend along the lower outer circumferential surface of the steel bar 11 with the other side ribs 14 as a starting point, respectively, to reach the one side ribs 14.
상기 리브(14)는 콘크리트와의 부착 면적을 보다 증가시키고, 제1마디(12)와 제2마디(13)를 지지하여 콘크리트와의 부착력을 향상시킨다. The rib 14 further increases the attachment area with the concrete and supports the first and second nodes 12 and 13 to improve the adhesion with the concrete.
본 발명에서 리브(14)는 도 5 및 도 9에서 볼 수 있는 바와 같이, 봉강(11)의 횡단면에서 서로 대면하는 양 측면에 형성된다.In the present invention, the ribs 14 are formed on both sides facing each other in the cross section of the bar 11, as can be seen in Figures 5 and 9.
또한, 도 5 및 도 9의 실시예에서와 같이, 상부의 제1마디(12) 하부에는 제2마디(13)가 배치되도록 서로 교차되어 돌출 형성될 수 있다. In addition, as shown in the embodiment of FIGS. 5 and 9, the lower portion of the first node 12 may be formed to cross and protrude from each other so that the second node 13 is disposed.
따라서 도 7 및 도 11에서와 같이 단면적이 넓은 제1마디(12)와 단면적이 좁은 제2마디(13)가 동일 단면상에 상부와 하부에 각각 하나씩 위치하므로, 철근의 전 길이에 걸쳐 모든 단면에서 면적이 동일하다.Therefore, as shown in FIGS. 7 and 11, since the first section 12 having a wider cross-sectional area and the second section 13 having a narrower cross-sectional area are positioned one at the top and the other at the same cross section, respectively, in all cross sections over the entire length of the rebar. The area is the same.
이때, 도 5 내지 도 7의 실시예에서와 같이 상기 제1마디(12) 및 제2마디(13)는 상부와 하부가 서로 대칭되는 방향으로 경사지게 형성되거나, 도 9 내지 도 11의 실시예에서와 같이 상기 제1마디(12) 및 제2마디(13)는 상부와 하부가 서로 동일한 방향으로 경사지게 형성될 수 있다. In this case, as in the embodiments of FIGS. 5 to 7, the first and second nodes 12 and 13 are formed to be inclined in a direction in which the upper and lower parts are symmetrical with each other, or in the embodiments of FIGS. 9 to 11. As described above, the first and second nodes 12 and 13 may be formed to have an upper portion and a lower portion inclined in the same direction.
한편, 상기 제1마디(12)의 마디면적비와 제2마디(13)의 마디면적비의 합은 0.1 이상 0.14 이하가 되도록 구성할 수 있다.On the other hand, the sum of the node area ratio of the first node 12 and the node area ratio of the second node 13 may be configured to be 0.1 or more and 0.14 or less.
즉, ACI 규준에서와 같이 마디면적비가 0.10~0.14 사이의 범위에 있도록 하면, 뽑힘 파괴와 쪼갬 파괴가 일어나지 않으면서 종래에 비하여 높은 마디면적비를 유지하여 높은 부착강도를 얻을 수 있다. That is, when the nodal area ratio is in the range of 0.10 to 0.14 as in the ACI standard, it is possible to obtain a high bond strength by maintaining a higher nodal area ratio than the conventional one without pulling fracture and splitting fracture.
마디면적비(relative rib area, Rr)는 전단면적(shearing area)에 대한 지압면적(bearing area)의 비를 의미하는 것으로, 상기 지압면적 및 전단면적은 각각 도 3의 (a) 및 (b)에서와 같이 산정할 수 있다. The relative rib area (R r ) means the ratio of the bearing area to the shearing area, and the bearing area and the shear area are respectively shown in FIGS. It can be calculated as
도 8은 철근 길이에 따른 철근단면적을 나타내는 그래프이다.8 is a graph showing the rebar cross-sectional area according to the rebar length.
도 8의 (a)는 도 4에 도시된 이형철근의 실시예에 대한 것으로, 도 4의 실시예에서는 이형철근의 길이 방향을 따라 높은 마디와 낮은 마디가 교대로 일정 간격 이격 배치된다. 8A illustrates an embodiment of the deformed rebar shown in FIG. 4, in which the high and low nodes are alternately spaced apart from each other along the longitudinal direction of the deformed rebar.
따라서 철근 단면적 또한 이형철근의 길이 방향을 따라 높고 낮게 돌출되는 부분이 형성되어, 철근에 작용하는 인장응력이 고르게 분포하지 못함을 알 수 있다. Therefore, the rebar cross-sectional area is also formed high and low protruding portion along the longitudinal direction of the reinforcing bar, it can be seen that the tensile stress acting on the reinforcing bar is not evenly distributed.
반면, 도 8의 (b)는 본 발명에 따른 이형철근의 실시예에 대한 것으로, 본 발명에서는 이형철근의 길이 방향을 따라 높이가 서로 다른 제1, 2마디(12, 13)가 봉강(11)의 길이 방향 축과 일정한 경사각을 가지고 형성된다.On the other hand, Figure 8 (b) is for the embodiment of the deformed reinforcing bar according to the present invention, in the present invention, the first and second nodes (12, 13) having different heights along the longitudinal direction of the deformed reinforcing bar 11 ) Is formed with a longitudinal axis and a constant inclination angle.
특히, 제1마디(12) 및 제2마디(13)가 시작되는 위치와 인접하는 제1마디(12) 및 제2마디(13)가 끝나는 위치를 연결하는 선이 각각 이형철근의 축 방향과 직교하도록 배치하는 경우에는 도 8의 (b)에서와 같이 이형철근의 전 길이에 걸쳐 철근 단면적이 동일하다. In particular, the lines connecting the positions where the first and second nodes 12 and 13 begin and the ends of the first and second nodes 12 and 13 are adjacent to the axial direction of the deformed rebar, respectively, In the case of arranging orthogonally, the rebar cross-sectional area is the same over the entire length of the deformed bar as shown in FIG.
따라서 각각 높고 낮게 배치되는 제1, 2마디(12, 13)를 경사 배치하여 얻은 부착강도의 증가분을 부착강도 증가에 유효하게 전부 활용할 수 있다.Therefore, it is possible to effectively utilize all of the increase in the adhesion strength obtained by tilting the first and second nodes 12 and 13 disposed high and low, respectively.
도 12는 본 발명 부착력 강화 이형철근 일부를 도시하는 사시도이다.12 is a perspective view showing a part of the present invention adhesion-strengthening reinforced bar.
도 12에서와 같이, 상기 제1마디(12)와 제2마디(13)의 상단을 연결한 선과 이형철근 축과의 각도(θ)는 15도 이하가 되도록 구성할 수 있다. As illustrated in FIG. 12, the angle θ between the line connecting the upper ends of the first and second nodes 12 and 13 and the deformed rebar axis may be 15 degrees or less.
전단 파괴면은 통상 철근 표면과 15도 각도를 이루게 되는데, 상기와 같이 제1마디(12)와 제2마디(13)의 상단을 연결한 선과 이형철근 축과의 각도(θ)를 제한하는 경우 전단 파괴면이 제2마디(13)에 의해 단절되지 않는다. The shear fracture surface is usually at an angle of 15 degrees with the reinforcing bar surface. As described above, when the angle (θ) between the line connecting the upper ends of the first and second nodes 12 and 13 and the deformed rebar axis is limited. The shear fracture surface is not disconnected by the second node 13.
따라서 제1, 2마디(12, 13) 높이의 최대 차이를 제한함으로써, 전단 파괴면의 면적을 최대한 넓게 할 수 있어 부착강도를 증가시킬 수 있다.Accordingly, by limiting the maximum difference between the heights of the first and second nodes 12 and 13, the area of the shear failure surface can be made as wide as possible, thereby increasing the adhesive strength.
본 발명의 부착력 강화 이형철근은 철근의 전 길이에 걸쳐 응력이 고르게 분배됨으로써 콘크리트와의 부착성능 및 균열저항능력을 향상시킬 수 있어 철근콘크리트 구조물의 내구성을 증가시킬 수 있다는 점에서 본 발명은 산업상 이용 가능성이 있다.The present invention is industrial in that the adhesive strength-reinforced deformed reinforcing bar of the present invention can improve the adhesion performance and crack resistance ability with concrete by uniformly distributing stress over the entire length of the rebar, thereby increasing the durability of the reinforced concrete structure. There is possibility.
또한, 생산공정에서 마디틀의 손상이 줄어들어 마디틀의 교체시기를 연장시킬 수 있다는 점에서도 본 발명은 산업상 이용 가능성이 있다.In addition, the present invention has industrial applicability in that the damage of the header in the production process can be reduced to prolong the replacement time of the header.

Claims (5)

  1. 단면이 원형인 봉강(11);A steel bar 11 having a circular cross section;
    복수 개가 봉강(11) 외주면에 상호 일정 간격 이격되도록 돌출되는 제1마디(12); 및A plurality of first bars 12 protruding from the bar 11 to be spaced apart from each other by a predetermined distance; And
    복수 개가 봉강(11) 외주면에 돌출되는 것으로 인접하는 제1마디(12)의 사이에 배치되고 제1마디(12)보다 높이가 낮은 제2마디(13); 로 구성되되,A plurality of second nodes 13 protruding from the outer circumferential surface of the bar 11 and disposed between the adjacent first nodes 12 and having a height lower than that of the first nodes 12; Consisting of
    상기 제1마디(12)와 제2마디(13)는 봉강(11)의 길이 방향 축과 일정 각도 경사지게 형성되고, The first node 12 and the second node 13 is formed to be inclined at an angle with a longitudinal axis of the bar 11,
    상기 봉강(11)의 양 측면에는 길이 방향으로 리브(14)가 각각 형성되고, 상기 제1마디(12) 및 제2마디(13)는 리브(14)를 기준으로 상부와 하부로 분할되어 형성되며, Ribs 14 are formed on both sides of the bar 11 in the longitudinal direction, respectively, and the first and second nodes 12 and 13 are divided into upper and lower parts based on the ribs 14. ,
    상기 제1마디(12) 및 제2마디(13)가 동일 단면상에 상부와 하부에 각각 하나씩 위치하도록 하여 이형철근의 전 길이에 걸쳐 단면적이 동일한 것을 특징으로 하는 부착력 강화 이형철근.The first bar 12 and the second bar 13 are positioned in the upper and lower portions on the same section, respectively, one by one, characterized in that the cross-sectional area is the same across the entire length of the deformed reinforcement.
  2. 제1항에서,In claim 1,
    상기 제1마디(12) 및 제2마디(13)는 상부와 하부가 서로 대칭되는 방향으로 경사지게 형성되는 것을 특징으로 하는 부착력 강화 이형철근. The first bar 12 and the second bar 13 is attached to the reinforced reinforced reinforcing bar, characterized in that the top and bottom are formed to be inclined in a direction symmetrical with each other.
  3. 제1항에서,In claim 1,
    상기 제1마디(12) 및 제2마디(13)는 상부와 하부가 서로 동일한 방향으로 경사지게 형성되는 것을 특징으로 하는 부착력 강화 이형철근.The first bar 12 and the second bar 13 is attached to the reinforced reinforced reinforcement, characterized in that the top and bottom are formed inclined in the same direction with each other.
  4. 제1항 내지 제3항 중 어느 한 항에서,The method according to any one of claims 1 to 3,
    상기 제1마디(12)의 마디면적비와 제2마디(13)의 마디면적비의 합은 0.1 이상 0.14 이하인 것을 특징으로 하는 부착력 강화 이형철근.The sum of the node area ratio of the first node (12) and the node area ratio of the second node (13) is 0.1 to 0.14 of the reinforced reinforced reinforced reinforcing bar, characterized in that.
  5. 제4항에서,In claim 4,
    상기 제1마디(12)와 제2마디(13)의 상단을 연결한 선과 이형철근 축과의 각도(θ)는 15도 이하인 것을 특징으로 하는 부착력 강화 이형철근.An adhesive force-enhanced deformed reinforcing bar, characterized in that the angle (θ) between the line connecting the upper ends of the first and second nodes 12 and 13 and the deformed rebar axis is 15 degrees or less.
PCT/KR2015/008236 2014-08-29 2015-08-06 Deformed bar for improving bond strength WO2016032143A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2014-0113891 2014-08-29
KR1020140113891A KR101540344B1 (en) 2014-08-29 2014-08-29 Deformed Bar for Enhancing Bond Strength

Publications (1)

Publication Number Publication Date
WO2016032143A1 true WO2016032143A1 (en) 2016-03-03

Family

ID=53876977

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2015/008236 WO2016032143A1 (en) 2014-08-29 2015-08-06 Deformed bar for improving bond strength

Country Status (2)

Country Link
KR (1) KR101540344B1 (en)
WO (1) WO2016032143A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190068326A (en) 2017-12-08 2019-06-18 김진환 Locking reinforcement rebar

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010003162A (en) * 1999-06-21 2001-01-15 최병근 Iron reinforcing rod and method for making the same
KR20050038811A (en) * 2003-10-23 2005-04-29 문은석 Reinforcing bar
KR20110034482A (en) * 2009-09-28 2011-04-05 현대제철 주식회사 Steel bar of reinforcement and method for cutting roll manufacturing the same
KR20110108792A (en) * 2010-03-29 2011-10-06 현대제철 주식회사 Apparatus of deformed bar having structure for improving adhesive strength
KR20120067113A (en) * 2010-12-15 2012-06-25 숭실대학교산학협력단 Deformed bar having ribs having different heights

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010003162A (en) * 1999-06-21 2001-01-15 최병근 Iron reinforcing rod and method for making the same
KR20050038811A (en) * 2003-10-23 2005-04-29 문은석 Reinforcing bar
KR20110034482A (en) * 2009-09-28 2011-04-05 현대제철 주식회사 Steel bar of reinforcement and method for cutting roll manufacturing the same
KR20110108792A (en) * 2010-03-29 2011-10-06 현대제철 주식회사 Apparatus of deformed bar having structure for improving adhesive strength
KR20120067113A (en) * 2010-12-15 2012-06-25 숭실대학교산학협력단 Deformed bar having ribs having different heights

Also Published As

Publication number Publication date
KR101540344B1 (en) 2015-07-30

Similar Documents

Publication Publication Date Title
WO2009136762A9 (en) Method for the continuous construction of psc composite girders using cross beams as fixing parts, and a structure therefor
WO2019093540A1 (en) Column reinforcing structure using v-shaped steel tie bar
KR101371098B1 (en) Reinforcement structure of masonry wall
WO2016060334A1 (en) Precast pier and precast pier construction method using same
WO2015147415A1 (en) Inner tie hoop fixing structure of reinforced concrete vertical member using tie hoop fixing clip or tie hoop fixing member
JP2014047489A (en) Anchorage structure of oblique cable
WO2014200272A1 (en) Pre-stressed concrete girder segment having improved cross-sectional stiffness
KR101077090B1 (en) Bridge structure of continuous PSC girder
JP2005083072A (en) Joint structure and joint construction method for precast concrete slab
WO2016032143A1 (en) Deformed bar for improving bond strength
KR20090126493A (en) Precast concrete girder
KR20110052101A (en) Ultra high performance concrete slab for cable bridge
WO2019164077A1 (en) Hybrid psc girder having reverse t-shaped cross section and method for constructing slab using same
KR20100066692A (en) Psc beam connection method for continuous bridge using plat anchorage apparatus
KR101621918B1 (en) Structure and Method for Reinforcing Concrete Member using FRP bar fixed by Anchor for Tendon
KR101257941B1 (en) Steel box girder and construction method for girder thereof
WO2011108858A2 (en) Reinforced lattice girder
KR20100123405A (en) Structure for filling-up a steel reinforced concrete on h shaped section steel in slab bridge
KR200302128Y1 (en) prestressed preflex steel composite beam possible to retensioning
WO2012081828A2 (en) Deformed reinforcing bar having sections of different heights
WO2016200083A1 (en) Prestressed concrete girder
KR101709989B1 (en) Smart steel pipe girder for composition pipe
WO2017204393A1 (en) Tendon fixing system of long-span fire-resistant deck tensioned and fixed on end of deck, and method for constructing same
WO2014116057A1 (en) Deck connection structure of system deck plate and system deck plate provided with deck connection structure
KR102270087B1 (en) Bracket for supporting insulation material

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15836506

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15836506

Country of ref document: EP

Kind code of ref document: A1