EP1592854A1 - Systeme de membrures de ferme - Google Patents

Systeme de membrures de ferme

Info

Publication number
EP1592854A1
EP1592854A1 EP04709396A EP04709396A EP1592854A1 EP 1592854 A1 EP1592854 A1 EP 1592854A1 EP 04709396 A EP04709396 A EP 04709396A EP 04709396 A EP04709396 A EP 04709396A EP 1592854 A1 EP1592854 A1 EP 1592854A1
Authority
EP
European Patent Office
Prior art keywords
truss
chord
web
bent
rod
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Withdrawn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
EP04709396A
Other languages
German (de)
English (en)
Inventor
George Wegler
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.)
WEGLER George
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1592854A1 publication Critical patent/EP1592854A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E04B5/36—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor
    • E04B5/38—Floor structures wholly cast in situ with or without form units or reinforcements with form units as part of the floor with slab-shaped form units acting simultaneously as reinforcement; Form slabs with reinforcements extending laterally outside the element
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
    • 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
    • E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
    • E04C5/065—Light-weight girders, e.g. with precast parts

Definitions

  • the invention concerns an arrangement of the kind that is specified in the preamble of the patent claim 1.
  • the invention is a further development of the Swedish patent SE 502302 E04C 3/293 PCT SE 94/00700 An arrangement at a beam or a building element, particularly the truss web members which are illustrated in the figures 21 A-B and 22 A-D.
  • the invention according to this patent makes it possible to cast the cords in strengthening truss beams in a building element at the same time as one casts the element slab, to deal with the heavy handling needed by precast beams and to speed up the process . This has been demonstrated to function well.
  • flanks of the web rods are no longer straight. These flanks form the uncovered part of the truss, tensioned and compressed.
  • a curved rod has an injurious effect of the durability and strength of the construction, especially on the compressed truss rods.
  • the web rods today consist exclusively of so-called ribbed reinforcement steel. Upon the lamination of these rods, there always occurs a longitudinal bead on the outside, which bead lands up in different axial positions inside the automatic bending machine .
  • the purpose of the invention is to obtain for the web rods as many of the above-mentioned good qualities as possible, but without the above-mentioned disadvantages.
  • the purpose of the invention is to obtain satisfactory joining between a web rod and a cast chord or a slab. This will make the strengthening beam extraordinarily strong and light, with little material consumption and can now be manufactured at a much lower cost.
  • the main problem is the twists that occur in the cast-in bent part of the web rod. This twisting occurs in each bending, being caused by the force directions of the web rods; the first force compressed and the other tensioned, which act to make the cord concrete to crack. Beams with plane bent webs simply don't function. The chords will crack at minimum of load.
  • the beam web assembly contains several truss web members consisting of a rod bent to a triangular shape or a triangle like shape, that each truss web member has hook- like bends in both ends, the bends being mirror images of each other, that the middle of said web member is straight and forms the base in said triangle shaped member, that said web member is bent, in the main symmetrical view, around the middle of said base part, the straight ends forming the side parts in said triangle shaped web member, that said end bends are oriented beside each other when seen in the chord longitudinal direction and wrapped over adjacent to each other so that said straight ends of said web members intersect each other in one of said triangle corners, and together with said end bends form a loop so that one, with the chord, longitudinal reinforcement rod can be threaded inside said loops, where said end bends are somewhat or entirely transverse to the chord longitudinal direction and that said bends are cast in inside the chord,
  • the design of trus web members consisting of a rod bent to a triangular shape or a triangle like shape
  • chord does not need to be made wider in order to cover these projecting ends.
  • the main thing is that they land up well inside the hanging moulds that shapes the chord.
  • the mould halves still can have a strait division in the joint between them, and can be joined tightly where the straight parts of the web ends cross each other.
  • the truss web is bent from a coiled rod.
  • the web rod passes through a straightening apparatus then bent by four turns, counting first from the rod end we make the first end hook, after that the first base bending, then the second base bending and at last the second end hook. After that the rod is cut and a truss web member is ready to be used.
  • Fig 3 A shows obviously that the two cast moulds halves used for shaping the chord (8) can still have a strait joint in the "X" which is formed by each web member's crossed shanks. Further we can see in Fig 3 B that the truss web members have not any right- or left side, and can be assembled as they drop after being manufactured. There is no trouble to get the end bends (2) and (2') close to each other.
  • chord (8) must of course be made somewhat higher to maintain the concrete cover, but the material consumption is moderate when the chord is so thin.
  • Fig 1 A, B, C and D shows a way to bend truss web members (1,4), according to the invention, to describe the geometry.
  • Fig 2 shows in perspective truss web members (1,4), according to the invention, assembled into a truss, joined to longitudinal reinforcement rods (6,7,7'), ready to be cast inside a beam or a building element.
  • Fig 3 A and B shows, with two views, how a complete building element has been created with a slab (9) and a strengthening truss beam (15) .
  • the strengthening truss beam (15) consists of a chord (8) and a truss joined together by web members (1,4) and longitudinal reinforcement rods (6,7,7').
  • Fig 4 shows in three views, a complete building element ready for delivery.
  • Fig 5 shows in principle an example of a non-acceptable web member (13) according to the previous technique, with spreading, nonparallel ends (12) .
  • Fig 6 shows, in perspective, an example of a desirable shape for a truss web assembly (13) according to the previous technique, with closely placed parallel end shanks (12) .
  • Fig 7 A and B shows in principle, with two views, an example of a desirable shape of a truss web assembly (13) according to previous technique. Description of example of performance
  • Fig 1 A, B, C and D shows a way to bend truss web members (1,4), according to the invention, and to describe the geometry of the truss .
  • a straight web rod (Fig 1 A) is furnished with end bends (2,2').
  • the ends are bent downwards approximately 180 degrees (Fig 1 B) .
  • the web rod is bent again symmetrically around the straight part in the centre of the rod with two side parts mirrored upwards about 110 degrees (Fig 1 C) until the hook-like ends of the web rod intersect each other (Fig 1 D) .
  • the web member now has a triangular shape, where the upper corner forms when the ends (1,4) overlap each other.
  • the end bends are arranged so that the two bends (2,2') together form a sufficiently sized loop, seen in the plane of the triangle, ready to accommodate a longitudinal reinforcement rod (6) and ready to be cast inside the chord (8) .
  • Fig 2 shows in perspective truss web members (1,4), according to the invention, assembled into a truss, joined to longitudinal reinforcement rods (6,7,7'), ready to be cast inside a beam or a building element.
  • Fig 3 A and B shows, with two views, how a complete building element has been created with a slab (9) and a strengthening truss beam (15) .
  • the strengthening truss beam (15) consists of a chord (8) and a truss joined together by web members (1,4) and longitudinal reinforcement rods (6,7,7').
  • the bends (2,2') of the beam web members (1,4) are cast inside the chord together with a longitudinal reinforcement rod (6) .
  • the web member's (1,4) base parts (5) are together with two longitudinal reinforcement rods (7,7') cast inside the element slab (9) .
  • Fig 4 shows in three views, a complete building element ready for delivery.
  • Fig 5 shows in principle an example of a non-acceptable web member (13) according to the previous technique, with spreading, nonparallel ends (12) .
  • Fig 6 shows, in perspective, an example of a desirable shape for a truss web assembly (13) according to the previous technique, with closely placed parallel end shanks (12) . That is hard to obtain in practice.
  • Fig 7 A and B A and B shows in principle, with two views, an example of a desirable shape of a truss web assembly (13) according to previous technique. Please observe that the base shanks (12) lie in a horizontal level (a necessity) although not quite close to each other, which is hard to meet in practice.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Tents Or Canopies (AREA)

Abstract

L'invention concerne une âme de ferme (1, 4) destinée à renforcer des poutres-fermes (15) sur un hourdis (9) dans une partie de bâtiment présentant au moins une membrure coulée (8). Un ensemble âme de ferme (1, 4), formant une âme de ferme constituée de barres pliées, placées en diagonale, vues dans le sens longitudinal de la membrure, fixées à la membrure et au hourdis dans la partie de bâtiment. Les éléments d'âme de ferme (1, 4) sont constitués de parties de barres pliées en forme de type triangle, présentent des crochets d'extrémité (2, 2') aux deux extrémités, lesquels sont pliés symétriquement autour de la partie intermédiaire droite de chaque élément d'âme miroir, de sorte que les extrémités droites des éléments d'âme s'entrecroisent les unes les autres dans l'un des angles du triangle. Les extrémités sont orientées de manière adjacente les unes aux autres et enroulées sur elles-mêmes, de sorte que les crochets d'extrémité (2, 2) forment une boucle dans laquelle des barres de renfort (6), longitudinales à la membrure (8), peuvent être passées à l'intérieur et lesdits crochets d'extrémité sont coulés à l'intérieur de la membrure (8).
EP04709396A 2003-02-10 2004-02-09 Systeme de membrures de ferme Withdrawn EP1592854A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0300332 2003-02-10
SE0300332A SE524781C2 (sv) 2003-02-10 2003-02-10 Anordning vid fackverksbalkar
PCT/SE2004/000167 WO2004070131A1 (fr) 2003-02-10 2004-02-09 Systeme de membrures de ferme

Publications (1)

Publication Number Publication Date
EP1592854A1 true EP1592854A1 (fr) 2005-11-09

Family

ID=20290340

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04709396A Withdrawn EP1592854A1 (fr) 2003-02-10 2004-02-09 Systeme de membrures de ferme

Country Status (8)

Country Link
US (1) US20060185310A1 (fr)
EP (1) EP1592854A1 (fr)
CN (1) CN100497862C (fr)
CA (1) CA2555796C (fr)
NO (1) NO20054188L (fr)
PL (1) PL376646A1 (fr)
SE (1) SE524781C2 (fr)
WO (1) WO2004070131A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006014789U1 (de) * 2006-09-26 2008-02-07 Daas, Kamal Gittertragwerk
CN101906871A (zh) * 2010-07-15 2010-12-08 天津市建科机械制造有限公司 简易型承力式模板桁架
CN101922231A (zh) * 2010-08-06 2010-12-22 天津市建科机械制造有限公司 简约型承力式模板桁架
CN102108785A (zh) * 2011-01-27 2011-06-29 天津市建科机械制造有限公司 滚焊式模板桁架
ES2549630T3 (es) * 2011-04-29 2015-10-30 Geo-Hidrol, S.A. Armadura para uso estructural
DE202013011404U1 (de) * 2013-07-31 2014-11-04 Sz Schacht- Und Streckenausbau Gmbh Gitterträger
CN104947850B (zh) * 2015-06-17 2016-10-05 中国建筑第二工程局有限公司 屋盖梭形桁架及其施工方法
KR101854160B1 (ko) * 2016-07-15 2018-05-03 (주)엔테이지 횡단면 압축 좌굴이 보강된 프리캐스트 바닥판
CN109403522A (zh) * 2018-11-01 2019-03-01 武汉科技大学 钢筋桁架泡沫混凝土复合楼板
CN114075853A (zh) * 2020-08-15 2022-02-22 长沙巨星轻质建材股份有限公司 一种砼预应力叠合用底板
CN114075851A (zh) * 2020-08-15 2022-02-22 长沙巨星轻质建材股份有限公司 一种装配式砼预应力叠合用底板
CN112982771A (zh) * 2021-03-03 2021-06-18 青岛腾远设计事务所有限公司 一种全预制格构式钢筋混凝土免支撑楼板及其制作方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US893792A (en) * 1907-05-04 1908-07-21 William C Gabriel Reinforcement for concrete or cement construction.
US2558946A (en) * 1943-11-19 1951-07-03 Fromson Bertram William Reinforced cast structure
GB816059A (en) * 1955-05-18 1959-07-08 Fritz Grebner Lattice girders and structural steel lattice framework
US3885369A (en) * 1973-03-08 1975-05-27 Vigarex Ets Structural element
DE2343452A1 (de) * 1973-08-29 1975-03-06 Rheinbau Gmbh Gittertraeger
US4185423A (en) * 1978-03-27 1980-01-29 Systems Concept, Inc. Lightweight building module
DE3405187C2 (de) * 1983-10-28 1995-07-27 Carl Georg & Sohn Gmbh Co Kg Abziehbalken
DE3436882A1 (de) * 1984-07-27 1986-01-30 Burger, Frank, 8000 München Rahmensystem, insbesondere fuer gestelle und den innenausbau
SE466860B (sv) * 1990-12-28 1992-04-13 George Wegler Anordning vid byggelement
US5119614A (en) * 1991-01-28 1992-06-09 Superior Precast Concrete post reinforcing apparatus
SE501459C2 (sv) * 1993-07-19 1995-02-20 George Wegler Anordning vid balkupplag
GB2316102B (en) * 1996-08-09 2001-03-07 Mark Eliott Fisher Truss

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004070131A1 *

Also Published As

Publication number Publication date
US20060185310A1 (en) 2006-08-24
CA2555796C (fr) 2014-11-04
CN1748065A (zh) 2006-03-15
SE0300332D0 (sv) 2003-02-10
WO2004070131A1 (fr) 2004-08-19
CA2555796A1 (fr) 2004-08-19
SE524781C2 (sv) 2004-10-05
NO20054188D0 (no) 2005-09-09
NO20054188L (no) 2005-09-30
PL376646A1 (pl) 2006-01-09
CN100497862C (zh) 2009-06-10
SE0300332L (sv) 2004-08-11

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