EP0738808B1 - Concrete molding form member connector - Google Patents

Concrete molding form member connector Download PDF

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Publication number
EP0738808B1
EP0738808B1 EP96105660A EP96105660A EP0738808B1 EP 0738808 B1 EP0738808 B1 EP 0738808B1 EP 96105660 A EP96105660 A EP 96105660A EP 96105660 A EP96105660 A EP 96105660A EP 0738808 B1 EP0738808 B1 EP 0738808B1
Authority
EP
European Patent Office
Prior art keywords
form member
holding
member connector
insertional
holding surface
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.)
Expired - Lifetime
Application number
EP96105660A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0738808A1 (en
Inventor
Yoshiyuki Hayakawa
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0738808A1 publication Critical patent/EP0738808A1/en
Application granted granted Critical
Publication of EP0738808B1 publication Critical patent/EP0738808B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
    • E04G17/04—Connecting or fastening means for metallic forming or stiffening elements, e.g. for connecting metallic elements to non-metallic elements

Definitions

  • the present invention relates to a concrete molding form member connector which is employed for molding concrete in civil engineering/construction work or manufacturing a concrete secondary product.
  • connectors which are prepared by working metal round bars are employed in general.
  • the conventional concrete molding form member connector 10 comprises a first holding portion 11, a second holding portion 12 which is opposed to the first holding portion 11 in a parallel manner at a prescribed space, a bent grip portion 16 which is continuous with first ends of the first and second holding portions 11 and 12 for integrally coupling the same with each other, and an insertional shaft portion 13 perpendicularly extending from a second end of the first holding portion 11.
  • a concrete molding form member connector 10 is obtained by bending a round bar of a metal such as iron, for example.
  • the insertional shaft portion 13 is first inserted in a connector mounting hole 27 which is provided in each of the form member side plate portions 5 and 6, in a state shown in Fig. 9A. Then, the grip portion 16 is hit with a hammer or the like, to rotate the first and second holding portions 11 and 12 about the center of the insertional shaft portion 13, thereby holding the form member side plate portions 5 and 6 between the first and second holding portions 11 and 12 as shown in Figs. 9B and 9C.
  • the form member side plate portions 5 and 6 are fixed to adjacent form members 17 and 18 for forming a wood concrete molding form respectively, and pressure P is applied to the form members 17 and 18 by concrete which is placed in concrete molding. Due to this pressure P, force F0 acts in directions for separating the form members 17 and 18 from each other against connection/fixation.
  • the form member side plate portions 5 and 6 were set at lengths L1 and L2 of 30 mm and 50 mm respectively with lengths of 300 mm in the longitudinal direction (direction perpendicular to the plane of Fig. 10A), fastened to each other with four nails 19a, 19b, 19c and 19d of 65 mm in length and 3.5 mm in diameter as shown in Fig. 10A, and subjected to a tensile test in this state, as shown in Fig. 10B. Consequently, force F1 which was required for separating the form members 17 and 18 through breakage of the junction was about 150 kg. Thus, it is inferred that each nail can withstand force of about 40 kg at the maximum in fastening.
  • the tensile strength for fastening/fixing form members to each other may be at a relatively low level conceivably because force which is applied to the form members by the pressure of placed concrete mainly acts perpendicularly to planes of concrete placing surfaces of the form members without remarkably acting on the surface directions.
  • the form member connector 10 can withstand tensile force of at least about 180 kg. It can be said that strength of at least twice is attained in this numerical value as compared with the tensile strength of 80 kg in the case of connecting/fixing the wood form members 17 and 18 to each other with the two nails 19a and 19b in form member side plate portions 25 and 26. Namely, the aforementioned conventional form member connector 10 has excessive strength, since the same is made of a metal such as iron.
  • Such a conventional metal form member connector 10 is formed by bending a round rod, and hence opposite contact parts 14 and 15 of the first and second holding portions 11 and 12 holding the form member side plate portions 5 and 6 in practice are substantially in a state of line contact as shown in Fig. 12A, or close to a state of point contact in an extreme case.
  • Fig. 12B shows a portion around the holding portions holding the form member side plate portions 5 and 6 of form members 7 and 8 between the first and second holding portions 11 and 12 along a section taken along the line A - A in Fig. 12A in a typically enlarged manner. As shown in Fig.
  • parts of the first and second holding portions 11 and 12 which are in contact with the form member side plate portions 5 and 6 are at a contact angle ⁇ of about 15 ° in the full circumference of 360 ° about the central axis of the round bar forming the form member connector 10. Assuming that the parts of the first and second holding portions 11 and 12 which are in contact with the form member side plate portions 5 and 6 along the direction perpendicular to the plane of Fig.
  • the conventional concrete molding form member connector heavy and inferior in workability since the same is formed by a round bar of iron or the like as hereinabove described. Further, employment of a hammer or the like is inevitably necessary for attaching or detaching the concrete molding form member connector 10 to or from the form member side plate portions 5 and 6 due to high rigidity of the form member connector 10. Thus, the concrete molding form member connector 10 may be displaced from the connector mounting holes 27 provided in the form member side plate portions 5 and 6, deformed, or may endanger the operator. In addition, the conventional concrete molding form member connector 10 has such disadvantages that the same is rusted by rain or the like and corroded, inconvenient to carry and inferior in workability due to a relatively heavy weight, and at a relatively high cost.
  • the document GB-A-600 606 discloses a concrete molding form member connector having a first holding portion with a first holding surface of a prescribed length and a cylindrical insertional shaft portion provided in the vicinity of the end of an extension of a lever attached to the connector.
  • the central axis of the shaft is perpendicular to the first holding surface.
  • the connector further comprises a second holding portion opposed to the first holding surface in a parallel manner with its free end being positioned at a prescribed space with respect to the cylindrical insertional shaft portion.
  • the document US-A-5 080 321 discloses a concrete molding form member connector having first and second holding portions and a cylindrical insertional shaft on the first holding surface opposed to the second holding surface.
  • the documents NL-A-7 603 908, GB-A-1 520 259 and US-A-5 039 059 disclose concrete molding form member connectors having a second holding surface arranged in parallel to a first holding surface, wherein an insertional shaft is provided on the first holding surface.
  • An object of the present invention is to provide a concrete molding form member connector which can be readily and safely attached to or detached from form member side plate portions, improves working efficiency with its lightweightness, prevents corrosion by rust or the like, causes no deformation, and withstands long-term use at a relatively low cost.
  • the concrete molding form member connector comprises a first holding portion having a linearly extending first holding surface of a prescribed length, a cylindrical insertional shaft portion, having a central axis perpendicular to the first holding surface, which is provided in the vicinity of a first end on the first holding surface, and a second holding portion, having a second holding surface which is opposed to the first holding surface in a parallel manner at a prescribed space in a region close to a second end of the first holding surface, which is continuous with the first holding portion on the second end of the first holding surface so that its free end is positioned at a prescribed space with respect to the insertional shaft portion.
  • the insertional shaft portion is inserted in holes which are provided to pass through side plate portions, being in contact with each other, of adjacent concrete molding form members and the connector is rotated about the insertional shaft portion, so that the first and second holding surfaces hold the side plate portions of the adjacent form members thereby connecting/fixing the adjacent form members to each other.
  • the first and second holding portions consist of a resin compact in the aforementioned structure.
  • This concrete molding form member connector is manufactured by forming at least the first and second holding portions by integral molding of resin, and properly joining/fixing the remaining portion which is prepared from another material thereto.
  • the principal portion of the connector can be formed by a resin compact since necessary holding power can be ensured with relatively small holding pressure due to holding by surface contact. Consequently, the connector can be manufactured by forming the principal portion by integral molding of resin and properly joining/fixing the remaining portion which is made of another material thereto by adhesion or the like, whereby a concrete molding form member connector which is lightweight, excellent in workability and suitable for mass production can be provided at a relatively low cost.
  • the insertional shaft portion is provided with a male screw part on its free end.
  • the male screw part is so provided on the free end of the insertional shaft portion that a nut is fitted with this male screw part in application to connection of form members, and side surfaces of overlapping side plate portions of adjacent form members are held by the first holding surface and a bolt around connector mounting holes of the side plate portions receiving the insertional shaft portion, to be fastened/fixed to each other. Consequently, stronger connection/fixation of the form members is implemented.
  • a concrete molding form member connector 1 according to a first embodiment of the present invention is described with reference to Figs. 1A to 3 as follows: Referring to Figs. 1A to 1C, the form member connector 1 according to the present invention is provided with a first holding portion 3 having a linearly extending first holding surface 3a of a prescribed length, and a cylindrical insertional shaft portion 5, having a central axis which is perpendicular to the first holding surface 3a, provided in the vicinity of a first end of the first holding surface 3a.
  • a second holding portion 4 having a free end whose second holding surface 4a is opposed to the first holding surface 3a in a parallel manner at a prescribed space is provided in the vicinity of a second end of the first holding portion 3.
  • the overall form member connector 1 according to this embodiment is formed by integral molding of resin.
  • the insertional shaft portion 2 is inserted in a connector mounting hole 27 which is provided in each of the form member side plate portions 5 and 6, as shown in Fig. 2A. Then, the connector 1 is manually rotated about the insertional shaft portion 2 as shown in Fig. 2B, for holding the overlapping form member side plate portions 5 and 6 between the first and second holding portions 3 and 4, i.e., between the first and second holding surfaces 3a and 4a which are opposed to each other.
  • the form member connector 1 comes into contact with the form member side plate portions 5 and 6 in a region of the first holding surface 3a shown in a hatched manner in Fig. 3, and a region of the second holding surface 4a which is opposed thereto.
  • the area of each such region is about 200 mm , assuming that the region is 20 mm in length and 10 mm in width. This means that a contact area of about six times that of the aforementioned conventional form member connector 10 having a contact area of about 34 mm is ensured.
  • the tensile force acting on the form members in the state of employment of the form member connector 1 is about 100 kg at the maximum, and hence surface stress which is caused on contact surfaces between the form member connector 1 and the form member side plate portions 5 and 6 is about 0.5 kg/mm .
  • An ordinary resin compact can sufficiently withstand such surface stress.
  • the form member connector 1 according to this embodiment is formed by integral molding of a resin material, whereby the same is easy to manufacture, lightweight, and excellent in workability in carrying or attachment. Further, the form member connector 1 according to this embodiment which is made of a resin material is not excessive in rigidity as compared with the conventional form member connector 10 which is made of a metal material, whereby the same can be sufficiently rotated by hand for holding the form member side plate portions with no necessity of hitting with a hammer or the like, whereby workability in attachment and detachment is further improved.
  • the resin material for the form member connector 1 is prepared from a mixed material of ABS resin having relatively high mechanical strength and thermoplastic nylon resin
  • a mixture of ABS resin and thermoplastic engineering plastic other than nylon resin can alternatively be employed.
  • a thermoplastic resin material is optimum as the material to be mixed with ABS resin, thermosetting polyester/epoxy resin or the like can alternatively be employed as the mixed material.
  • first and second holding portions 3 and 4 of the form member connector 1 have rectangular cross sections as shown in Fig. 6A
  • the cross sections may be so shaped that the first and second holding surfaces 3a and 4a can form planes.
  • sectional shapes shown in Figs. 6B to 6D are also employable, so far as required mechanical strength is satisfied.
  • the cross-sectional shapes shown in Fig. 6B or 6D provide rib structures so that the connector can be further reduced in weight while maintaining its mechanical strength, and can hold the form member side plate portions 5 and 6 on the basis of a principle which is similar to that of the connector shown in Fig. 6A.
  • FIG. 4A A concrete molding form member connector 30 according to a second embodiment of the present invention is now described with reference to Figs. 4A, 4B, 7A and 7B.
  • an insertional shaft portion 2 is formed by previously working a metal, so that its base end is joined to a portion of a first holding surface 3a of a first holding portion 3 which is close to its free end and integrally molded in a shape shown in Fig. 7A when the first holding portion 3 and a second holding portion 4 are integrally molded by resin.
  • a male screw part 2a is formed on a free end of the insertional shaft portion 2 of the form member connector 30 according to this embodiment as shown in Fig.
  • the insertional shaft portion 2 of the form member connector 30 can be reinforced by press-fitting/joining a sleeve-like metal cover 22, for example, with its base end, as shown in Fig. 7A.
  • a female screw 3b may be formed in the vicinity of the free end of the first holding portion 3 as shown in Fig. 7B after the first and second holding portions 3 and 4 are integrally molded, so that the male screw part 2b which is provided on the metal insertional shaft portion 2 is fitted therewith for joining/fixation, in place of embedding/molding the insertional shaft portion 2 simultaneously with integral molding of the first and second holding portions 3 and 4.
  • a cylindrical hole may be formed in the vicinity of the free end of the first holding portion 3 in place of the female screw 3b for press-fitting the base end of the insertional shaft portion 2 therewith for attaining joining/fixation.
  • a resin material which is similar to that in the first embodiment can be employed for the first and second holding portions 3 and 4.
  • the aforementioned concrete molding form member connectors 1 and 30 according to the first and second embodiments of the present invention are effectively utilized for forming concrete secondary products such as a large box culvert of concrete shown in Fig. 13A and an upright stop L-shaped product shown in Fig. 13B, for example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Clamps And Clips (AREA)
  • Joining Of Building Structures In Genera (AREA)
EP96105660A 1995-04-21 1996-04-10 Concrete molding form member connector Expired - Lifetime EP0738808B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP9699895 1995-04-21
JP7096998A JP2952181B2 (ja) 1995-04-21 1995-04-21 コンクリート成形用型枠材連結具
JP96998/95 1995-04-21

Publications (2)

Publication Number Publication Date
EP0738808A1 EP0738808A1 (en) 1996-10-23
EP0738808B1 true EP0738808B1 (en) 2000-01-26

Family

ID=14179876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96105660A Expired - Lifetime EP0738808B1 (en) 1995-04-21 1996-04-10 Concrete molding form member connector

Country Status (7)

Country Link
EP (1) EP0738808B1 (ja)
JP (1) JP2952181B2 (ja)
KR (1) KR0181251B1 (ja)
CN (1) CN1148126A (ja)
AT (1) ATE189288T1 (ja)
CA (1) CA2173400A1 (ja)
DE (1) DE69606344T2 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11256817A (ja) 1998-03-16 1999-09-21 Long Home Kk コンクリート成形用型枠材
MY168491A (en) * 2006-11-15 2018-11-09 Wendy Yong A system of formwork and connecting means
CN103437551B (zh) * 2013-09-05 2015-11-25 中铁上海工程局有限公司 纵横向模板定位卡
CN103470025B (zh) * 2013-09-29 2015-11-18 李德福 快速拆装塑料平面模板及其拼接方法
JP7038979B2 (ja) * 2017-08-31 2022-03-22 啓二 橋爪 金属製コンクリート基礎型枠装置
DE102018206238A1 (de) * 2018-04-24 2019-10-24 Hünnebeck GmbH Verbindungselement für Schalungen
CN109518961B (zh) * 2018-12-03 2021-04-30 广东博智林机器人有限公司 一种半固态成形的快速组装模板机构
JP2021050519A (ja) * 2019-09-25 2021-04-01 サクラ化学工業株式会社 連結具及びその製造方法
CN114571156A (zh) * 2022-04-18 2022-06-03 蔚来汽车科技(安徽)有限公司 预固定工装

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB600606A (en) * 1943-12-24 1948-04-14 William Allen Jennings Improvements in or relating to form panels for concrete structures
GB1520259A (en) * 1975-11-27 1978-08-02 Maquinaria Y Utiles Para La Co Demountable and extensible metal shuttering for the concreting of pillars walls and girders
NL7603908A (en) * 1976-04-13 1977-10-17 Mij Voor Toepassing Van Arbeid Wall panel securing clamp - has pivot pin fitting in flange holes and notch gripping flanges
US5039059A (en) * 1989-05-08 1991-08-13 Symons Corporation Waler bracket for concrete forming structure
US5080321A (en) * 1990-05-04 1992-01-14 Western Forms, Inc. Concrete form panel construction

Also Published As

Publication number Publication date
JP2952181B2 (ja) 1999-09-20
KR0181251B1 (ko) 1999-04-01
ATE189288T1 (de) 2000-02-15
EP0738808A1 (en) 1996-10-23
DE69606344D1 (de) 2000-03-02
CA2173400A1 (en) 1996-10-22
CN1148126A (zh) 1997-04-23
KR960038021A (ko) 1996-11-19
DE69606344T2 (de) 2000-06-08
JPH08291623A (ja) 1996-11-05

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