WO2004070131A1 - An arrangement of truss cords - Google Patents
An arrangement of truss cords Download PDFInfo
- Publication number
- WO2004070131A1 WO2004070131A1 PCT/SE2004/000167 SE2004000167W WO2004070131A1 WO 2004070131 A1 WO2004070131 A1 WO 2004070131A1 SE 2004000167 W SE2004000167 W SE 2004000167W WO 2004070131 A1 WO2004070131 A1 WO 2004070131A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- truss
- chord
- web
- bent
- rod
- Prior art date
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
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04709396A EP1592854A1 (en) | 2003-02-10 | 2004-02-09 | An arrangement of truss cords |
CA2555796A CA2555796C (en) | 2003-02-10 | 2004-02-09 | An arrangement of truss cords |
US10/542,818 US20060185310A1 (en) | 2003-02-10 | 2004-02-09 | Arrangement of truss cords |
NO20054188A NO20054188L (en) | 2003-02-10 | 2005-09-09 | An arrangement of trade unions |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0300332-4 | 2003-02-10 | ||
SE0300332A SE524781C2 (en) | 2003-02-10 | 2003-02-10 | Device at truss beams |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004070131A1 true WO2004070131A1 (en) | 2004-08-19 |
Family
ID=20290340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2004/000167 WO2004070131A1 (en) | 2003-02-10 | 2004-02-09 | An arrangement of truss cords |
Country Status (8)
Country | Link |
---|---|
US (1) | US20060185310A1 (en) |
EP (1) | EP1592854A1 (en) |
CN (1) | CN100497862C (en) |
CA (1) | CA2555796C (en) |
NO (1) | NO20054188L (en) |
PL (1) | PL376646A1 (en) |
SE (1) | SE524781C2 (en) |
WO (1) | WO2004070131A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT14596U1 (en) * | 2013-07-31 | 2016-02-15 | Sz Schacht Und Streckenausbau Gmbh | Lattice girder for the construction of tunnel-shaped structures |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202006014789U1 (en) * | 2006-09-26 | 2008-02-07 | Daas, Kamal | Lattice support structure |
CN101906871A (en) * | 2010-07-15 | 2010-12-08 | 天津市建科机械制造有限公司 | Simple bearing type template truss |
CN101922231A (en) * | 2010-08-06 | 2010-12-22 | 天津市建科机械制造有限公司 | Simple strength bearing type template truss |
CN102108785A (en) * | 2011-01-27 | 2011-06-29 | 天津市建科机械制造有限公司 | Roll welding type template truss |
EP2719842B1 (en) * | 2011-04-29 | 2015-09-02 | Geo-Hidrol, S.A. | Framework for structural use |
CN104947850B (en) * | 2015-06-17 | 2016-10-05 | 中国建筑第二工程局有限公司 | Shuttle-shaped roof truss and construction method thereof |
KR101854160B1 (en) * | 2016-07-15 | 2018-05-03 | (주)엔테이지 | Concrete Precast Slab |
CN109403522A (en) * | 2018-11-01 | 2019-03-01 | 武汉科技大学 | Steel bar girder foam concrete composite floor plate |
CN114075853A (en) * | 2020-08-15 | 2022-02-22 | 长沙巨星轻质建材股份有限公司 | Bottom plate for concrete prestress superposition |
CN114075851A (en) * | 2020-08-15 | 2022-02-22 | 长沙巨星轻质建材股份有限公司 | Bottom plate for assembling type concrete prestress overlapping |
CN112982771A (en) * | 2021-03-03 | 2021-06-18 | 青岛腾远设计事务所有限公司 | Fully-prefabricated lattice type reinforced concrete support-free floor and manufacturing method thereof |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2343452A1 (en) * | 1973-08-29 | 1975-03-06 | Rheinbau Gmbh | LATTICE GIRDER |
DE3405187A1 (en) * | 1983-10-28 | 1985-05-09 | Georg Carl & Sohn GmbH & Co KG, 8644 Pressig | Screeding bar |
WO1992012303A1 (en) * | 1990-12-28 | 1992-07-23 | George Wegler | Arrangement of building element |
WO1995003461A1 (en) * | 1993-07-19 | 1995-02-02 | Resaro Ab | Arrangement at a beam or building element and a mould for making a beam or building element |
Family Cites Families (8)
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 |
US4185423A (en) * | 1978-03-27 | 1980-01-29 | Systems Concept, Inc. | Lightweight building module |
DE3436882A1 (en) * | 1984-07-27 | 1986-01-30 | Burger, Frank, 8000 München | FRAME SYSTEM, ESPECIALLY FOR FRAMES AND INTERIORS |
US5119614A (en) * | 1991-01-28 | 1992-06-09 | Superior Precast | Concrete post reinforcing apparatus |
GB2316102B (en) * | 1996-08-09 | 2001-03-07 | Mark Eliott Fisher | Truss |
-
2003
- 2003-02-10 SE SE0300332A patent/SE524781C2/en not_active IP Right Cessation
-
2004
- 2004-02-09 CN CNB2004800035077A patent/CN100497862C/en not_active Expired - Fee Related
- 2004-02-09 PL PL376646A patent/PL376646A1/en not_active Application Discontinuation
- 2004-02-09 WO PCT/SE2004/000167 patent/WO2004070131A1/en active Application Filing
- 2004-02-09 CA CA2555796A patent/CA2555796C/en not_active Expired - Fee Related
- 2004-02-09 US US10/542,818 patent/US20060185310A1/en not_active Abandoned
- 2004-02-09 EP EP04709396A patent/EP1592854A1/en not_active Withdrawn
-
2005
- 2005-09-09 NO NO20054188A patent/NO20054188L/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2343452A1 (en) * | 1973-08-29 | 1975-03-06 | Rheinbau Gmbh | LATTICE GIRDER |
DE3405187A1 (en) * | 1983-10-28 | 1985-05-09 | Georg Carl & Sohn GmbH & Co KG, 8644 Pressig | Screeding bar |
WO1992012303A1 (en) * | 1990-12-28 | 1992-07-23 | George Wegler | Arrangement of building element |
WO1995003461A1 (en) * | 1993-07-19 | 1995-02-02 | Resaro Ab | Arrangement at a beam or building element and a mould for making a beam or building element |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT14596U1 (en) * | 2013-07-31 | 2016-02-15 | Sz Schacht Und Streckenausbau Gmbh | Lattice girder for the construction of tunnel-shaped structures |
Also Published As
Publication number | Publication date |
---|---|
CN100497862C (en) | 2009-06-10 |
CA2555796A1 (en) | 2004-08-19 |
PL376646A1 (en) | 2006-01-09 |
NO20054188D0 (en) | 2005-09-09 |
CN1748065A (en) | 2006-03-15 |
CA2555796C (en) | 2014-11-04 |
SE0300332L (en) | 2004-08-11 |
SE0300332D0 (en) | 2003-02-10 |
US20060185310A1 (en) | 2006-08-24 |
EP1592854A1 (en) | 2005-11-09 |
NO20054188L (en) | 2005-09-30 |
SE524781C2 (en) | 2004-10-05 |
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