US20100088995A1 - Reinforcing bar joint - Google Patents

Reinforcing bar joint Download PDF

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Publication number
US20100088995A1
US20100088995A1 US12/310,026 US31002607A US2010088995A1 US 20100088995 A1 US20100088995 A1 US 20100088995A1 US 31002607 A US31002607 A US 31002607A US 2010088995 A1 US2010088995 A1 US 2010088995A1
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US
United States
Prior art keywords
reinforcing bars
load transfer
sleeve
transfer rod
reinforcing bar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/310,026
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English (en)
Inventor
Satoshi Murayama
Mitsuhiro Yoshida
Takaaki Hirayama
Yoshitaka Kurihara
Andrew R. Cramer
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Okabe Co Ltd
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Okabe Co Ltd
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 Okabe Co Ltd filed Critical Okabe Co Ltd
Assigned to OKABE CO., LTD. reassignment OKABE CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CRAMER, ANDREW R., HIRAYAMA, TAKAAKI, KURIHARA, YOSHITAKA, MURAYAMA, SATOSHI, YOSHIDA, MITSUHIRO
Publication of US20100088995A1 publication Critical patent/US20100088995A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a reinforcing bar joint to be used for joining reinforcing bars.
  • Reinforcing bars are main components of reinforced concrete structures (RC structures) and steel-reinforced concrete structures (SRC structures), and are cut in predetermined lengths so as to be arranged easily during configuration on-site. The operation of joining reinforcing bars on-site is thus indispensable.
  • a lap joint can join reinforcing bars easily by utilizing the bar's adhesion to concrete. Since two reinforcing bars must be overlapped, it becomes harder to perform various bar arrangements or secure overlapping lengths of such as the bar diameter increases. Furthermore, a mechanical coupler requires management on such details as the insert length of the reinforcing bars being inserted into the coupler and the fastening torque being applied.
  • a gas-pressure welding joint requires the welder to hold a particular qualification for executing of the gas-pressure welding.
  • one method for joining pairs of mutually parallel reinforcing bars is applicable only to reinforcing bars having fixed spacings, and thus is not sufficiently versatile in terms of bar pitch (see patent document 1).
  • joining methods that use a U-shaped sleeve cannot provide sufficient joint strength (see patent documents 2 and 3).
  • a joint is composed of an elliptic-sectioned steel sleeve and a wedge member. According to such a joint, the end portions of two reinforcing bars are inserted into the sleeve from respective opposite directions, and then the wedge member can be driven into the space between the two reinforcing bars through a wedge insertion hole formed in the sleeve to join the reinforcing bars together (see patent document 4 and non-patent document 1).
  • Patent Document 1 Publication of Japanese Patent No. 3197079
  • Patent Document 2 Japanese Patent Application Laid-Open No. Hei 5-156721
  • Patent Document 3 Japanese Utility Model Publication No. Hei 3-047052
  • Patent Document 4 Japanese Utility Model Publication No. Sho 58-32498
  • Non-Patent Document 1 ERICO International Corporation, [searched on Aug. 2, 2006], the Internet ⁇ URL: http://www.erico.com/products/QuickWedge.asp>
  • the present invention has been developed in view of the foregoing circumstances, and it is thus an object thereof to provide a reinforcing bar joint which is capable of avoiding the rotation of its sleeve, providing an enhanced joining force between reinforcing bars.
  • Another object of the present invention is to provide a reinforcing bar joint which is capable of suppressing bending of the reinforcing bars at the position where a wedge member is driven in.
  • a reinforcing bar joint In a reinforcing bar joint according to the present invention, the end portions of two reinforcing bars are inserted into openings in both ends of a sleeve, respectively, so that the reinforcing bars are arranged in series along an identical line.
  • a load transfer rod is also inserted through the sleeve so as to be in parallel with the end portions of the respective reinforcing bars.
  • first wedge member is pressed into the space between either one of the two reinforcing bars and the load transfer rod.
  • a second wedge member is pressed into the space between the other reinforcing bar and the load transfer rod.
  • the sleeve is composed of a pair of semicylindrical wall portions which are arranged with their curved inner surfaces opposing each other, and a pair of flat wall portions which extend to corresponding edges of the pair of semicylindrical wall portions.
  • the internal space of the sleeve forms a bar insert space at the side of one of the semicylindrical wall portions, and the end portions of the two reinforcing bars are inserted thereto from both the openings of the sleeve, respectively.
  • the side of the other semicylindrical wall portion forms a rod insert space, and the load transfer rod is inserted therethrough from one of the openings into the other opening of the sleeve.
  • Wedge insertion holes are formed in each of the flat wall portions so as to lie between one of the reinforcing bars and the load transfer rod and between the other reinforcing bar and the load transfer rod.
  • first wedge member When the first wedge member is driven into the space between one of the reinforcing bars and the load transfer rod, it bites into and engages both the reinforcing bar and the load transfer rod by taking the reaction force from the semicylindrical wall portions of the sleeve. Similarly, when the second wedge member is driven into the space between the other reinforcing bar and the load transfer rod, it bites into and engages both the other reinforcing bar and the load transfer rod.
  • the first wedge member and the second wedge member have a tapered portion which bites into both the reinforcing bar and the load transfer rod as described above. Which of the two is bitten into to a greater degree depends primarily on the difference in hardness between the two. If the reinforcing bars are not sufficiently bitten into, the engaging forces between the reinforcing bars and the first wedge member and the second wedge member are then insufficient.
  • the load transfer rod have a hardness that is equivalent to or higher than that of the reinforcing bars so that the first and second wedge members bite into the reinforcing bars sufficiently as much as allowable in design.
  • the load transfer rod may, for example, be made of a straight steel rod having a circular cross section.
  • the load transfer rod has only to be arranged beside (on one side of) the two reinforcing bars, which are placed in series, whereas the load transfer rod may sometimes be arranged on both sides of the two reinforcing bars.
  • a first wedge member and a second wedge member are additionally required.
  • the reinforcing bars can sometimes be bent at the positions where the first and second wedge members are driven in, and extend obliquely from the sleeve even if the reinforcing bars have extended straight out from the sleeve prior to the first and second wedge members being pressed in.
  • protruding portions protruding toward the peripheries of the reinforcing bars are desirably formed on the load transfer rod.
  • the protruding portions may have any configuration.
  • the load transfer rod may be made of a straight portion and bent portions formed on both ends of the straight portion so that the bent portions form the protruding portions.
  • the load transfer rod may also be composed of a rod body and large diameter portions that are detachably attached to both ends of the rod body, the large diameter portions having an outer diameter that is greater than the rod body, so that the large diameter portions form the protruding portions.
  • FIGS. 1( a ) and 1 ( b ) are diagrams showing a reinforcing bar joint 1 according to a first embodiment, FIG. 1( a ) being a front view, FIG. 1( b ) being a sectional view taken along line A-A.
  • FIG. 2 is a diagram showing a state where reinforcing bars 5 a , 5 b are joined by the joint 1 completely.
  • FIGS. 3( a ) and 3 ( b ) are diagrams showing a reinforcing bar joint 41 according to a second embodiment, FIG. 3( a ) being a front view, FIG. 3( b ) being a sectional view taken along line B-B.
  • FIG. 4 is a diagram showing how large diameter portions 44 a and 44 b are attached to both ends of a rod body 45 .
  • FIG. 5 is a diagram showing a state where the protruding portions are absent and the reinforcing bars 5 a , 5 b are bent.
  • FIG. 6 is a front view of a reinforcing bar joint according to a modification.
  • FIGS. 7( a ) and 7 ( b ) are diagrams showing a reinforcing bar joint according to another modification, FIG. 7( a ) being a front view, FIG. 7( b ) being a sectional view taken along line C-C.
  • FIG. 1 is a diagram showing a reinforcing bar joint according to the present embodiment.
  • the reinforcing bar joint 1 according to the present embodiment comprises an elliptic-sectioned sleeve 2 , a load transfer rod 3 to be inserted through the sleeve, and wedging means 4 .
  • the sleeve 2 is configured so that end portions of reinforcing bars 5 a , 5 b can be inserted into openings 6 a , 6 b formed in both ends of the sleeve 2 so that the reinforcing bars are arranged in series along an identical line.
  • the load transfer rod 3 can also be inserted therethrough in parallel with the end portions of the reinforcing bars 5 a , 5 b which are inserted into the sleeve 2 .
  • the sleeve 2 is composed of a pair of semicylindrical wall portions 7 , 7 which are arranged with their curved inner surfaces opposing each other, and a pair of flat wall portions 8 , 8 which extend to the corresponding edges of the pair of semicylindrical wall portions.
  • Wedge insertion holes 9 a , 9 a are formed in the pair of flat wall portions 8 , 8 so as to be opposed to each other.
  • wedge insertion holes 9 b , 9 b are formed in the flat wall portions 8 , 8 so as to be opposed to each other.
  • the load transfer rod 3 is made of a straight steel rod having a circular cross section.
  • the wedging means 4 include a wedge member 4 a as a first wedge member to be driven into the space between the reinforcing bar 5 a and the load transfer rod 3 , and a wedge member 4 b as a second wedge member to be driven into the space between the reinforcing bar 5 b and the load transfer rod 3 .
  • the wedge member 4 a is inserted through the wedge insertion holes 9 a , 9 a which are formed between the reinforcing bar 5 a and the load transfer rod 3 .
  • the wedge member 4 b is inserted through the wedge insertion holes 9 b , 9 b which are formed between the reinforcing bar 5 b and the load transfer rod 3 .
  • the wedge member 4 a has a tapered portion which bites into both the reinforcing bar 5 a and the load transfer rod 3 and wedge member 4 b has a tapered portion which bites into both the reinforcing bar 5 b and the load transfer rod 3 , as described above. Which of the two is bitten into to a greater extent depends primarily on the difference in hardness between the two. If the reinforcing bar 5 a is not sufficiently bitten into, the engaging force between the reinforcing bars 5 a and the wedge member 4 a is then insufficient and similarly if the reinforcing bar 5 b is not sufficiently bitten into, the engaging force between the reinforcing bar 5 b and the wedge member 4 b is then insufficient.
  • the load transfer rod 3 have a hardness that is equivalent to or higher than that of the reinforcing bars 5 a , 5 b so that the wedge members 4 a , 4 b sufficiently bite into the reinforcing bars 5 a , 5 b as much as allowable in design, respectively.
  • the load transfer rod 3 may be made of S45C (carbon steel for machine structural use, JIS).
  • one end portion of the reinforcing bar 5 a is initially inserted into one opening 6 a of the sleeve 2 and one end portion of the reinforcing bar 5 b is inserted into the other opening 6 b of the sleeve 2 .
  • the load transfer rod 3 is inserted through the sleeve 2 .
  • the load transfer rod 3 is inserted into the sleeve 2 so as to be in parallel with the end portions of the reinforcing bars 5 a , 5 b.
  • the wedge member 4 a is inserted and pressed into the wedge insertion holes 9 a , 9 a
  • the wedge member 4 b is inserted and pressed into the wedge insertion holes 9 b , 9 b .
  • a conventionally known wedge driver may be selected and used as appropriate.
  • FIG. 2 is a diagram showing a state where the wedge driving operation is completed, resulting in the joining of the reinforcing bars 5 a , 5 b completely.
  • the end portions of the two reinforcing bars 5 a , 5 b are inserted into the openings 6 a , 6 b in both ends of the sleeve 2 , respectively, so that the reinforcing bars are arranged in series along an identical line.
  • the load transfer rod 3 is also inserted through the sleeve 2 so as to be in parallel with the end portions of the reinforcing bars, and the two wedge members 4 a , 4 b are pressed in.
  • the wedge member 4 a is pressed into the space between the reinforcing bar 5 a and the load transfer rod 3
  • the wedge member 4 b is pressed into the space between the reinforcing bar 5 b and the load transfer rod 3 .
  • the introduction of the load transfer rod 3 makes it possible to transfer tensile loads in the situation where the two reinforcing bars 5 a , 5 b are arranged in series along an identical line.
  • the tensile loads from the respective reinforcing bars 5 a , 5 b act on the sleeve 2 along the same line of action, thereby preventing the sleeve 2 from being rotated.
  • the reinforcing bars 5 a , 5 b are free from bending ascribable to the rotation of the sleeve 2 , the reinforcing bars 5 a , 5 b are precluded from being broken by tension or by bending without the reinforcing bars exercising their tensile strengths. This makes it possible to fully exercise the tensile strengths of the reinforcing bars 5 a , 5 b.
  • the tensile tests undertaken used wedge members having a wedge length of 48 mm, a wedge diameter of 16 mm, and a tip length of 10 mm.
  • Table 1 shows specifications of the sleeves.
  • the sleeves tested were of three steel types: STKM13A (carbon steel for machine structural use, JIS), S45C (non-heat treated), and S45C (annealed).
  • the wedge members were made of one steel type S45C (refined and hardened).
  • Table 2 shows the results of the respective tensile tests.
  • Cases 1 and 2 were intended to examine the influence of shape variations, before examining what effects the relative difference in hardness between the reinforcing bars and the load transfer rod has on the tensile characteristics.
  • the load transfer rod was made of a deformed bar of steel type (SD345) having the same hardness as that of the reinforcing bars (SD345) to be joined, but was sourced from different steel bar producers.
  • Case 3 was intended to examine the case of using a load transfer rod of a steel type having the same specification (lower limit) of tensile strength as that of the reinforcing bars to be joined.
  • the load transfer rod was made of steel type SNR490B (rolled steel bar (round bar) for building construction use, JIS).
  • Cases 4 and 5 were intended to examine the cases of using load transfer rods of steel type harder than the reinforcing bars to be joined. Because a round bar is insusceptible to shape-based variations in tensile characteristic, the load transfer rods of round shape were used.
  • the load transfer rods were made of steel type S45C (refined) or SCM435.
  • Cases 7 and 9 were generally the same as cases 4 and 5, and were intended to examine the cases of using load transfer rods of steel type harder than the reinforcing bars to be joined. Because a round bar is insusceptible to shape-based variations in tensile characteristic, the load transfer rods of round shape were used.
  • the load transfer rods were made of steel type S45C (refined and hardened).
  • the reinforcing bars to be joined will cause base-material fracture without exception if the load transfer rod is made of steel type (S45C (refined), SCM435, S45C (refined and hardened)) that is harder than the reinforcing bars to be joined (SD345).
  • the load transfer rod must therefore have a hardness such that the degree of biting into the reinforcing bars does not become excessive and also cause deformation of the wedge members.
  • the wedging means be the hardest, and that the load transfer rod, the reinforcing bars to be joined, and the sleeve be made progressively softer in this order.
  • hardness was expressed in terms of tensile strength in order to avoid difficulties in comparison ascribable to different hardness-indicating specifications.
  • FIG. 3 is a diagram showing a reinforcing bar joint according to the second embodiment.
  • the reinforcing bar joint 41 according to the present embodiment comprises an elliptic-sectioned sleeve 2 , a load transfer rod 43 to be inserted through the sleeve, and wedging means 4 .
  • the load transfer rod 43 is composed of a rod body 45 and large diameter portions 44 a , 44 b which are protruding portions to be attached to respective ends of the rod body.
  • the large diameter portions 44 a , 44 b are formed to have an outer diameter that is greater than the rod body 45 , and internal threads are cut in their internal cavities.
  • the rod body 45 is made of a straight steel rod having a circular cross section with external threads in both ends. These external threads are engaged with the internal threads of the large diameter portions 44 a , 44 b respectively so that the large diameter portions 44 a , 44 b can be detachably attached to the respective ends of the rod body 45 .
  • the large diameter portions 44 a , 44 b have an outer diameter determined so that their peripheries come into contact with the reinforcing bars 5 a , 5 b respectively when they are engaged with the respective ends of the rod body 45 which is inserted through the sleeve 2 .
  • the radius of the large diameter portions 44 a , 44 b is made smaller, if necessary, than the distance from the axis of the rod body 45 to the peripheries of the reinforcing bars 5 a , 5 b so as not to hinder the operation of screwing the large diameter portions 44 a , 44 b onto the rod body 45 .
  • the wedge members 4 a , 4 b have a tapered portion which bites into both the reinforcing bar 5 a or 5 b and the load transfer rod 43 . Which of the two is bitten into to a greater degree depends primarily on the difference in hardness between the two. If the reinforcing bars 5 a , 5 b are not sufficiently bitten into, the engaging forces between the reinforcing bars 5 a , 5 b and the wedge members 4 a , 4 b are then insufficient.
  • the load transfer rod 43 have a hardness that is equivalent to or higher than that of the reinforcing bars 5 a , 5 b so that the wedge members 4 a , 4 b bite into the reinforcing bars 5 a , 5 b as much as allowable in design.
  • the load transfer rod 43 may be made of S45C (carbon steel for machine structural use, JIS).
  • the sleeve 2 and the wedging means 4 are the same as used in the first embodiment, and a description thereof will thus be omitted here.
  • one end portion of the reinforcing bar 5 a is initially inserted into one opening 6 a of the sleeve 2 and one end portion of the reinforcing bar 5 b is inserted into the other opening 6 b of the sleeve 2 .
  • the rod body 45 of the load transfer rod 43 is inserted through the sleeve 2 .
  • the rod body 45 is inserted into the sleeve 2 so as to be in parallel with the end portions of the reinforcing bars 5 a , 5 b.
  • the internal threads of the large diameter portions 44 a , 44 b are engaged with the external threads that are cut in both ends of the rod body 45 , as shown in FIG. 4 , so that the peripheries of the large diameter portions 44 a , 44 b make contact with the reinforcing bars 5 a , 5 b .
  • the large diameter portions 44 a , 44 b are made smaller in radius than the distance from the axis of the rod body 45 to the peripheries of the reinforcing bars 5 a , 5 b for the convenience of the screwing operation, a clearance occurs accordingly and both members will not be in contact in the strictest sense.
  • the wedge member 4 a is inserted and pressed into the wedge insertion holes 9 a , 9 a
  • the wedge member 4 b is inserted and pressed into the wedge insertion holes 9 b , 9 b .
  • a conventionally known wedge driver may be selected and used as appropriate.
  • the end portions of the two reinforcing bars 5 a , 5 b are inserted into the openings 6 a , 6 b in both ends of the sleeve 2 , respectively, so that the reinforcing bars are arranged in series along an identical line.
  • the load transfer rod 43 is inserted through the sleeve 2 so as to be in parallel with the end portions of the reinforcing bars, and the two wedge members 4 a , 4 b are pressed in.
  • the wedge member 4 a is pressed into the space between the reinforcing bar 5 a and the load transfer rod 43
  • the wedge member 4 b is pressed into the space between the reinforcing bar 5 b and the load transfer rod 43 .
  • the new introduction of the load transfer rod 43 makes it possible to transfer tensile loads in the situation where the two reinforcing bars 5 a , 5 b are arranged in series along an identical line.
  • the ends of the load transfer rod 43 are provided with the detachable large diameter portions 44 a , 44 b , respectively, and the large diameter portions 44 a , 44 b are formed so that the large diameter portions protrude toward the peripheries of the reinforcing bars 5 a , 5 b when attached to the respective ends of the load transfer rod 43 .
  • the large diameter portions 44 a , 44 b formed on the load transfer rod 43 make contact with the peripheries of the reinforcing bars 5 a , 5 b and can thus suppress the bending of the reinforcing bars 5 a , 5 b.
  • FIG. 5 schematically shows how the reinforcing bars 5 a , 5 b might be bent.
  • the press-in of the wedge members 4 a , 4 b can sometimes bend the reinforcing bars 5 a , 5 b at the driving positions as shown in the diagram. If the large diameter portions 44 a , 44 b are provided, however, the reinforcing bars 5 a , 5 b being bent come into contact with and are restrained by the large diameter portions 44 a , 44 b . As a result, the bending of the reinforcing bars 5 a , 5 b is suppressed.
  • the protruding portions of the present invention protruding toward the peripheries of the reinforcing bars, are formed as the large diameter portions 44 a , 44 b . Nevertheless, the protruding portions according to the present invention are not limited to such a configuration.
  • a load transfer rod 53 composed of a straight portion 54 and bent portions 52 , 52 formed on respective ends of the straight portion may be employed so that the bent portions 52 , 52 form the protruding portions.
  • a single load transfer rod 3 is inserted through the sleeve 2 so that it is in parallel with the end portions of the reinforcing bars 5 a , 5 b which are inserted into the sleeve 2 .
  • two load transfer rods 73 , 73 may both be inserted through a sleeve 72 so that they lie on both sides of the reinforcing bars 5 a , 5 b in parallel when the end portions of the reinforcing bars 5 a , 5 b are inserted into the sleeve 2 .
  • the wedging means 4 includes wedge members 4 a , 4 a , or first wedge member respectively to be driven into the spaces between the reinforcing bar 5 a and the load transfer rods 73 , 73 , and wedge members 4 b , 4 b , or second wedge member respectively to be driven into the space between the reinforcing bar 5 b and the load transfer rods 73 , 73 .
  • the wedge members 4 a , 4 a are inserted through wedge insertion holes 9 a , 9 a respectively which are formed in flat wall portions of the sleeve 72 between the reinforcing bar 5 a and the load transfer rods 73 , 73 .
  • the wedge members 4 b , 4 b are inserted through wedge insertion holes 9 b , 9 b respectively which are formed in the flat wall portions of the sleeve 72 between the reinforcing bar 5 b and the load transfer rods 73 , 73 .
  • the wedge members 4 a , 4 a and the wedge member 4 b , 4 b are the same as those detailed in the first embodiment, and a description thereof will thus be omitted here.
  • load transfer rods 3 , 53 , and 73 and the rod body 45 in the foregoing embodiments and various modifications thereof are attached on-site, they may instead be attached to the sleeve 2 or the sleeve 72 at a factory or the like in advance.
  • the number of wedge member 4 a to be pressed into the space between the reinforcing bar 5 a and the load transfer rod 3 , and the number of wedge member 4 b to be pressed into the space between the reinforcing bar 5 b and the load transfer rod 3 is one each.
  • the load transfer rod 53 and the load transfer rod 73 the same thing can be said also.
  • wedge members 4 a may be pressed in along the axes of the reinforcing bars 5 a .
  • the wedge member 4 b the same thing can be said also.
  • the minimum number of wedge members to be pressed in is one for each of the two reinforcing bars. Remaining wedge insertion holes may be left unused.
  • unused wedge insertion holes make concrete filling holes during concrete casting, so that concrete flows into the sleeve.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
US12/310,026 2006-08-10 2007-05-25 Reinforcing bar joint Abandoned US20100088995A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2006-218932 2006-08-10
JP2006218932 2006-08-10
PCT/JP2007/000564 WO2008018161A1 (fr) 2006-08-10 2007-05-25 Dispositif pour joindre des barres de renforcement les unes aux autres

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US20100088995A1 true US20100088995A1 (en) 2010-04-15

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US12/310,026 Abandoned US20100088995A1 (en) 2006-08-10 2007-05-25 Reinforcing bar joint

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US (1) US20100088995A1 (ja)
EP (1) EP2050889B1 (ja)
JP (1) JP4840828B2 (ja)
CN (1) CN101501284B (ja)
AT (1) ATE478211T1 (ja)
DE (1) DE602007008576D1 (ja)
TW (1) TW200837258A (ja)
WO (1) WO2008018161A1 (ja)

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US20120242319A1 (en) * 2011-03-22 2012-09-27 Seiko Epson Corporation Sensor device
US20130305652A1 (en) * 2012-05-18 2013-11-21 Neturen Co., Ltd. Rebar structure and reinforced concrete member
US20150000227A1 (en) * 2011-07-27 2015-01-01 Ae Connector Solutions Pte, Ltd Splice sleeve with elliptical or compound curve cross section
US9297741B2 (en) 2011-03-22 2016-03-29 Seiko Epson Corporation Corrosion detection sensor device
US20190177977A1 (en) * 2017-12-12 2019-06-13 Jason M. Miller Sleeve for coupling reinforcing bar and a method of using the same
US10577823B1 (en) 2016-02-15 2020-03-03 Esk, Llc Fence repair device

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JP2009249981A (ja) * 2008-04-10 2009-10-29 Kyushu Sankyo:Kk 鉄筋の溶接方法及びその溶接部探傷方法
JP2010196319A (ja) * 2009-02-24 2010-09-09 Okabe Co Ltd 棒鋼接合装置
JP5423050B2 (ja) * 2009-02-27 2014-02-19 大成ユーレック株式会社 プレキャストコンクリート板の接合方法とその方法に用いられる鉄筋の接合構造
US11293182B2 (en) 2016-09-12 2022-04-05 Coupler Solutions Limited Coupling device, associated parts and a method of use thereof
CN107338913B (zh) * 2017-08-25 2020-02-21 中冶建工集团有限公司 用于带有墩头的钢筋连接器

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TW200837258A (en) 2008-09-16
EP2050889B1 (en) 2010-08-18
CN101501284B (zh) 2011-01-26
CN101501284A (zh) 2009-08-05
DE602007008576D1 (de) 2010-09-30
JP4840828B2 (ja) 2011-12-21
EP2050889A1 (en) 2009-04-22
EP2050889A4 (en) 2009-07-08
ATE478211T1 (de) 2010-09-15
JPWO2008018161A1 (ja) 2009-12-24

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