EP3730715A1 - Werkzeuglose schnellkupplung für bewehrungsstäbe - Google Patents

Werkzeuglose schnellkupplung für bewehrungsstäbe Download PDF

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Publication number
EP3730715A1
EP3730715A1 EP20171372.4A EP20171372A EP3730715A1 EP 3730715 A1 EP3730715 A1 EP 3730715A1 EP 20171372 A EP20171372 A EP 20171372A EP 3730715 A1 EP3730715 A1 EP 3730715A1
Authority
EP
European Patent Office
Prior art keywords
rebar
coupler
spacer
locking jaws
spring
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.)
Withdrawn
Application number
EP20171372.4A
Other languages
English (en)
French (fr)
Inventor
Brandon Lee Cross
Jonathan Louis HANKENHOF
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dayton Superior Corp
Original Assignee
Dayton Superior Corp
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 Dayton Superior Corp filed Critical Dayton Superior Corp
Publication of EP3730715A1 publication Critical patent/EP3730715A1/de
Withdrawn legal-status Critical Current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 disclosure relates generally to coupling devices that are used in construction to connect elongated sections of reinforcing bar (“rebar”) prior to embedment within concrete members such as columns and beams, and in particular to a butt-splice type rebar coupler that is capable of developing the specified maximum tensile strength (“ultimate strength") of rebar upon connection and without the use of additional mechanical tools.
  • rebar reinforcing bar
  • butt-splice type rebar coupler that is capable of developing the specified maximum tensile strength (“ultimate strength") of rebar upon connection and without the use of additional mechanical tools.
  • Rebar couplers are commonly used in the construction industry for the splicing or connection of steel reinforcement members within precast and cast-in-place concrete structural elements, especially columns and beams. Elongated sections of reinforcing bar may be bent and/or cut and connected to form continuous reinforcement through longer structural elements, to form reinforcements through joints between intersecting structural elements, and to reduce reinforcement congestion within highly reinforced volumes of concrete structures.
  • couplings there are five different types of couplings that have been developed and adopted for widespread use:
  • Rebar is inserted into respective ends of an internally tapered metal casing to be approximated end-to-end.
  • Sets of locking jaws disposed within each end of the metal casing are shifted toward the middle of the casing by the inserted rebar ends until they can expand to surround the ends, whereupon the ends are slid through the expanded jaws.
  • the inventors have discerned a need for a tool-less "quick connect" type rebar coupler capable of developing the specified maximum tensile strength (i.e., "ultimate strength") of butt-spliced rebar sections.
  • a tool-less "quick connect” type rebar coupler capable of developing the specified maximum tensile strength (i.e., "ultimate strength") of butt-spliced rebar sections.
  • Such a device should be capable of visually indicating that the connection has been properly coupled, or be inspectable with only a moderate test force.
  • rebar coupler having a casing including opposite ends disposed along a central longitudinal axis. Each end includes a frustum-shaped internal wall, tapering along the central longitudinal axis from an inward position to an outward position, as well as an assembly of a plurality of locking laws, arrayed around the central longitudinal axis and engaging the frustum-shaped internal wall, at least a portion of a spring, aligned with the central longitudinal axis and engaging the plurality of locking jaws, and a spacer, initially positioned within and engaging the plurality of locking jaws to separate the plurality of locking jaws and hold the assembly towards the inward position.
  • the spacer is ejectable from the plurality of locking jaws through a center of the spring by insertion of a rebar end through the outward position and past the initial position of the spacer, whereupon the spring biases the plurality of locking jaws toward the outward position and into full engagement with the rebar end.
  • the rebar coupler includes a central section and opposing end sections respectively comprising one of the opposite ends.
  • the central section may include a backstop wall or annular radial projection, and each opposing end section may include a separate spring.
  • the backstop wall or projection may provide a spring seat for each spring, and may function as a barrier to insertion of a rebar end beyond the middle of the coupler.
  • the rebar coupler may omit the central section, with the opposing end sections respectively comprising one of the opposite ends and abutting each other.
  • the spring may be a single spring spanning between the respective pluralities of locking jaws within the opposing end sections.
  • FIG. 1 an exploded side view of an exemplary rebar coupler 100 is shown.
  • the coupler 100 has two opposing and opposite end sections 110 disposed along a central longitudinal axis L.
  • Each end section 110 includes a frustum-shaped internal wall 112 tapering along the central longitudinal axis L from an inward position 114 to an outward position 116.
  • the wall 112 may be frusto-conical, but it will be appreciated that the wall may be frustro-pyramidal or have any other higher-order polygonal cross-section.
  • Each end section 110 also includes an assembly having plurality of locking laws 120 arrayed around the central longitudinal axis L and engaging the frustum-shaped internal wall 112.
  • the assembly also has at least a portion of a spring 130 (as discussed in greater detail below) aligned with the central longitudinal axis L and engaging the plurality of locking jaws 120.
  • the assembly also has a spacer 140 initially positioned within and engaging the plurality of locking jaws 120 to both radially separate the plurality of locking jaws and maintain the assembly towards the inward position 114 of the end section 110.
  • the spacer 140 is ejectable from the plurality of locking jaws 120 through a center 132 of the spring 130 by inserting a rebar end through the outward position 116 and past the initial position of the spacer 140, whereupon the spring 130 biases the plurality of locking jaws 120 toward the outward position of the end section 110 and into full engagement with the rebar end.
  • the plurality of locking jaws 120 may each include teeth 122 to grip the rebar end after ejection of the spacer 140.
  • the plurality of locking jaws 120 may be manufactured from hardened or tool steel so as to "bite" into and potentially compress softer rebar material.
  • the plurality of locking jaws 120 may collectively present a first, inwardly-open-ended spring seat 124 for receiving the spring 130.
  • the plurality of locking jaws 120 may also collectively present a circumferential grove 126 around an inward end of the plurality of locking jaws 120.
  • the circumferential groove 126 may hold an elastic member 127, such as an O-ring, with the diameter of the held elastic member being greater than the diameter of spring 130 so that a force applied by the spring at the spring seat 124 torques the locking jaw members about the elastic member.
  • the diameter and relative positioning of the spring 130 and the elastic member 127 may thus bias the plurality of locking jaws 120 outward against the wall 112 of the respective end section 110 to prevent the outward ends of one or more of the jaw members from collapsing towards others.
  • the elastic member 127 and the spacer 140 engaging the plurality of locking jaws 120 may bias the plurality of locking jaws 120 against the wall 112 of the end section 110 to prevent the outward ends of one or more of the jaw members from collapsing towards others.
  • each member of the plurality of locking jaws 120 may include a spacer seat 128 for receiving the spacer within a predetermined portion of the locking jaws.
  • Each member of the plurality of locking jaws 120 may alternately or further include a ramped portion 129 projecting toward the central longitudinal axis L (as otherwise shown in FIG. 1 ). The ramped portion(s) may be disposed inward from the spacer seat(s) when both are present.
  • Collectively the plurality of locking jaws 120 and constituent spacer seats 128 or ramped portions 129 form a socket for receiving and retaining the spacer 140, while permitting the spacer to be ejected by inserting a rebar end substantially past the initial position of the spacer.
  • the spring 130 is illustrated as a coil compression spring but may be a wave compression spring or any other type of compression spring providing an open center 132.
  • the spring engages the plurality of locking jaws 120 and may engage them via the inwardly-open-ended spring seat 124 described above.
  • the spacer 140 may include an outwardly-exposed face 142. An inserted rebar end will abut the face 142 to eject the spacer 140 into the open center 132 of the spring 130 (as otherwise shown in FIG. 1 ). After ejection of the spacer 140, the spring 130 biases the plurality of locking jaws 120 toward the outward position 116, toward the central longitudinal axis L along the wall 112, and into full engagement with the rebar end.
  • the engagement of the face 142 of the spacer 140 with the spacer seats 128 may align the plurality of locking jaws 120 against the wall 112, as opposed to allowing the outward ends of one or more of the plurality of locking jaws to collapse towards others.
  • the spacer 140 may include a neck 144 narrowing toward the central longitudinal axis and the inward end 146 of the spacer.
  • the engagement of the neck 144 of the spacer 140 with the ramped portions 129 may similarly align the plurality of locking jaws 120 against the wall 112, as opposed to allowing the outward ends of one or more of the plurality of locking jaws to collapse towards others.
  • the rebar coupler 100 may include a central section 150 joining the two end sections 110 together.
  • the central section 150 may include a backstop wall 152 or annular radial projection (not shown, but substituting for wall 152) at least partially separating cavities 154 on either side of the central section 150 along the central longitudinal axis L.
  • the cavities 154 may provide a second spring seat 156 for the spring 130, with each assembly including a separate spring as shown in FIG. 1 .
  • the cavities 154 and backstop wall 152 may capture the inward end 146 of the spacer to block further movement of the spacer 140 and provide resistance against over-insertion of a rebar end.
  • the annular radial projection may capture and resist further movement of the neck 144 of spacer 140 so as to provide at least some resistance to further movement of the spacer and over-insertion of a rebar end.
  • Either of the backstop wall 152 or annular radial projection may include an annular longitudinal projection 158 disposed between the spring seat 156 and central longitudinal axis L.
  • the annular longitudinal projection 158 may provide a post-ejection seat for the spacer 140 when ejected from the jaw assembly 120 and separate the second spring seat 156 from the central, post-ejection seat.
  • the central section 150 and end sections 110 of the coupler 100 may be threaded so that the sections may be joined together or include bayonet connectors or other rotatable connector features so that the sections may be joined together. Alternately, the central section 150 and end section 110 of the coupler 110 may be connected by welds or adhesives at their mutual joints so that the sections may be joined together.
  • the rebar coupler 100 may omit the central section 150, with the opposing end sections 110 abutting each other.
  • the spring 130 in such aspects may be a single spring spanning between the respective pluralities of locking jaws 120 within the opposing end sections 110.
  • the opposing end sections 110 of the coupler 100 may be threaded so that the sections may be joined together or include bayonet connectors or other rotatable connector features so that the sections may be joined together.
  • the opposing end sections 110 of the coupler 100 may be connected by welds or adhesives at their mutual joints so that the sections may be joined together.
  • Each end section 110 may have an aperture 118 for the insertion of a rebar end that is sized to limit the diameter of the rebar end to one equal to or less than the minimum diameter of the plurality of locking jaws 120 when the spacer 140 is in the initial position in order to allow for easy insertion of the rebar end up to the initial position.
  • Each end section 110 and, when present, central section 150 may be manufactured (especially in thickness and material) to develop the ultimate strength of the inserted rebar across the connected rebar ends.
  • the end sections 110 and central section 150 when present, are manufactured from carbon steel, stainless steel, carbon fiber polymer laminate, glass fiber polymer laminate (e.g., G-10), or fiber-reinforced composite.
  • each end section 110 may be larger in diameter than the diameter of the aperture for insertion of the rebar end so that the casing need not itself be capable of developing the specified maximum tensile strength of the inserted rebar end.
  • FIGS. 5A-5C depict an installation sequence showing operation of the exemplary rebar coupler.
  • the insertion of rebar ends into the rebar coupler 100 is shown as being simultaneous for sake of clarity in description but is not necessarily required.
  • Fig. 5A shows the rebar coupler 100 just as an inserted end of rebar begins to abut the face 142 of spacer 140, with the assembly of the plurality of locking jaws 120, the spring 130, and most particularly the spacer 140 at an initial position. Spacer 140 maintains the assembly, against the bias of spring 130, in this initial position and towards the inward position with respect to the outward position.
  • the spacer 140 may be displaced into the central section 150, when present, and retained within the cavity 154, in engagement with the backstop wall or annular radial projection 152, annular longitudinal projection 158, or combinations thereof. Withdrawal of the rebar end will cause the plurality of locking jaws 120 to be driven by the walls 112 into the rebar end and ultimately be resisted by abutment between at least the rebar end, the adjoining plurality of locking jaws, and the adjoining casing. As suggested in the discussion of the previous paragraph, tensile loads may be carried by the casing itself to the other inserted rebar end or may be dissipated by the casing into compression of the concrete that surrounds it.
  • the disclosed devices differ from that device in at least two material respects.
  • the Gunin coupler relies upon a two-part, nested assembly of ramp and separator inserts to pre-position each set of locking jaws around the walls of a respective outward end of its coupler, where the assembly remains in contact with the jaws at all times.
  • the assembly prevents the jaws from closing around rebar with a diameter smaller than the initial internal circumference of the set, and the coupler appears to be designed for use with a single diameter of rebar.
  • the Gunin coupler uses insertion of a rebar end to shift the jaws within the coupler and spread the jaws sufficiently to allow for the rebar end to pass between them before the jaws begin to be held in rough position by a biasing spring.
  • the Gunin coupler will permit a rebar end to be only partially inserted, enough so that a portion of the rebar end passes between the jaws but not necessarily fully between the jaws and up to or beyond the outward end of a biasing spring, with no external visual indication that the rebar end is only partially engaged with the set of jaws.
  • Partial engagement with the set of jaws will provide some tensile resistance to further withdrawal of the rebar end, but not full tensile resistance so as to develop the yield strength or yield and ultimate strength of the rebar.
  • a failure to fully engage can only be tested by attempting to more fully insert the rebar end, which may not be possible when inspection is separate in time from installation and insertion, or by applying a substantial tensile force to the connection, which generally requires additional mechanical equipment. The inventors theorize that these behaviors explain why the Gunin coupler is not for use in creating ultimate strength rebar connections.
  • the disclosed couplers use a single spacer to separate each plurality of locking jaws and to pre-position that plurality of locking jaws around the walls of an inward portion of a respective opposing end section of the coupler.
  • the single spacer is ejected from the plurality of locking jaws which may allow the plurality to close around a range of rebar sizes - from at least the initial internal circumference of the presently-described assembly down to the internal circumference at which the lateral sides of the jaw members begin to abut (i.e., somewhat smaller than that indicated in FIG. 5C ) - depending upon factors such as the slope and distance between the inward and outward positions and the length of the jaws.
  • variants of the disclosed couplers could be used to couple rebar within a range of rebar sizes, with a single device being capable, e.g., of coupling #6- #10 rebar ends, while other variants may couple single sizes of rebar end or subranges of sizes of rebar ends within the customary range of sizes of #3 through #18.
  • the initial positioning of the spacer to bias/pre-position each plurality of jaws towards an inward position ensures that, with ejection of the spacer only after full insertion of the rebar end, the spring biases and shifts the plurality of locking jaws outward along the rebar end so that the locking jaws fully engage the rebar end and vice versa.
  • the disclosed couplers could be used to develop the ultimate strength of the rebar and for use in creating ultimate strength rebar connections with a clear indication that full engagement/insertion has been achieved.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
EP20171372.4A 2019-04-26 2020-04-24 Werkzeuglose schnellkupplung für bewehrungsstäbe Withdrawn EP3730715A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US201962839343P 2019-04-26 2019-04-26

Publications (1)

Publication Number Publication Date
EP3730715A1 true EP3730715A1 (de) 2020-10-28

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EP20171372.4A Withdrawn EP3730715A1 (de) 2019-04-26 2020-04-24 Werkzeuglose schnellkupplung für bewehrungsstäbe

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US (1) US20200340250A1 (de)
EP (1) EP3730715A1 (de)
AU (1) AU2020202777A1 (de)
CA (1) CA3079344A1 (de)
CO (1) CO2020005104A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11286683B2 (en) * 2019-03-12 2022-03-29 Idaho State University Ductile connections for pre-formed construction elements
KR102305094B1 (ko) * 2021-04-22 2021-09-27 주식회사 건우금속 철근 이음 장치
CN114839013B (zh) * 2022-04-20 2022-12-02 昆山市建设工程质量检测中心 一种测试钢筋与半灌浆套筒可焊性的专用试件和检验方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101683146B1 (ko) * 2016-05-04 2016-12-06 주식회사 씨케이인터스틸 원터치식 철근 커플러
KR101851104B1 (ko) * 2017-07-18 2018-04-20 (주) 유니플로 내구성이 구비된 원터치식 커플러
KR101941127B1 (ko) * 2018-07-13 2019-01-22 주식회사 베스트커플러 철근 이음용 커플러

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101683146B1 (ko) * 2016-05-04 2016-12-06 주식회사 씨케이인터스틸 원터치식 철근 커플러
KR101851104B1 (ko) * 2017-07-18 2018-04-20 (주) 유니플로 내구성이 구비된 원터치식 커플러
KR101941127B1 (ko) * 2018-07-13 2019-01-22 주식회사 베스트커플러 철근 이음용 커플러

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CO2020005104A1 (es) 2021-04-30
US20200340250A1 (en) 2020-10-29
CA3079344A1 (en) 2020-10-26
AU2020202777A1 (en) 2020-11-12

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