US3566567A - Concrete load supporting structure - Google Patents

Concrete load supporting structure Download PDF

Info

Publication number
US3566567A
US3566567A US844944A US3566567DA US3566567A US 3566567 A US3566567 A US 3566567A US 844944 A US844944 A US 844944A US 3566567D A US3566567D A US 3566567DA US 3566567 A US3566567 A US 3566567A
Authority
US
United States
Prior art keywords
supporting structure
concrete
girders
latticed
concrete load
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
US844944A
Other languages
English (en)
Inventor
Yoshiro Watanabe
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
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
Application granted granted Critical
Publication of US3566567A publication Critical patent/US3566567A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • E04B5/17—Floor structures partly formed in situ
    • E04B5/23—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated
    • E04B5/29—Floor structures partly formed in situ with stiffening ribs or other beam-like formations wholly or partly prefabricated the prefabricated parts of the beams consisting wholly of metal
    • 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
    • E04B5/40—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 with metal form-slabs

Definitions

  • a concrete load supporting structure of the type which comprises a plurality of relatively slender beams supported on girders, these beams being spaced and held in place by spacer strips whereby the beams are protected from becoming buckled under the influence of a concrete load.
  • This invention relates to improvements in and relating to a concrete load supporting structure and has particular reference to a structure of the type including open web steel joists.
  • a concrete load supporting structure which includes a framework generally consisting of longitudinal and transverse wide-flange girders each having a top and a bottom flange and a web, said girders being criss-crossed at and carried on supporting columns, a plurality of latticed beam members extending in parallel with the transverse girders and arranged in a substantially parallel spaced-apart relation, each of which members consisting of an upper chord, a lower chord and a latticed chord connected therebetween, and having its ends supported on and secured to the longitudinal girders, a plurality of spacer strips arranged in a substantially parallel spaced-apart relation and in parallel with the longitudinal girders, each of which strips spanning over and interlinking two adjacent beam members at points where said latticed chords are hinged to said upper chords of the beam members, whereby a supporting bed in a criss-cross pattern is formed, and corrugated sheets laid over the bed
  • FIG. 1 is a plan View partially broken away of the concrete load supporting structure embodying the present invention
  • FIG. 2 is a transverse cross-sectional view on an enlarged scale taken on line IIII in FIG. 1 with a concrete slab formed in the base;
  • FIG. 3 is a longitudinal cross-sectional view on an enlarged scale taken on line III-III in FIG. 1;
  • FIG. 4 is a frontal view on an enlarged scale of a 3,566,567 Patented Mar. 2, 1971 spacer strip for use in the first embodiment shown in FIGS. 1 through 3;
  • FIGS. 5 through 7, inclusive, show a second embodiment
  • FIG. 5 showing a view corresponding to FIG. 2;
  • FIG. 6 showing a view corresponding to FIG. 3 and
  • FIG. 7 showing a modified spacer strip.
  • FIG. 1 shows a concrete load supporting structure generally designated at 10 and considered here as a building floor for purposes of illustration.
  • This structure generally includes a steel framework consisting of a pair of opposed longitudinal girders 11 extending in criss-crossed relation with a pair of opposed transverse girders 12. These pairs of girders are supported on supporting columns 13 at as many points of criss-cross as may be required for a particular application.
  • Each girder 11 is an H-shape steel in common use having a top flange 14, a bottom flange 15 and a web 16 as shown in FIGS. 2, 3, 5 and 6.
  • Designated generally at 17 are a plurality of open Web steel joists or latticed beam members of a relatively slender steel such as round bars each consisting of an upper chord 18, a lower chord 19 and a latticed chord 20.
  • the latticed chord 20 is hinged for instance by welding as at 21 and 22 to the upper and lower chords 18 and 19, respectively.
  • the respective ends of the upper and lower chords are brought together and secured via suitable plate members 23 to the longitudinal girders 11 by means of welding, so that the latticed beams 17 run in a substantially parallel, spaced-apart relation and substantially in parallel with the transverse girders 12.
  • Designated at 24 is a spacer strip which in one preferred form assumes the shape shown in FIG. 4 and which has a straight, horizontal portion 25 and inwardly bent, hooked end portions 26.
  • the straight, horizontal portion 25 has a length substantially equal to the spacing or span between adjacent latticed beams 17.
  • Each of these spacer strips 24 spans over and interlinks two adjacent latticed beam members 17, for which purpose the hooked end portions 26 are arranged to hook around the upper hinges 21 of the beam members.
  • a plurality of spacer strips 24 are arranged in a substantially parallel, spaced-apart relation, and they intersect the latticed beam members 17 thereby forming a concrete load supporting structure in a criss-cross pattern.
  • the terminating groups of spacer strips 24 have one end portions devoid of the hooked portions 26 and bent slightly upward as at 24 in FIG. 3 so that with these end portions secured to the top flanges of the girders 12, the spacer strips 24 lie substantially flush with the top flange surface.
  • Designated at 27 is a corrugated steel sheet or the like which is laid over the supporting structure 10 and extends substantially at right angles to and in contact with the spacer strips 24. Over this corrugated steel sheet is cast a concrete slab containing therein reinforcing [bars (not illustrated)
  • the concrete load supporting structure thus constructed according to the invention features the provision of spacer strips 24 which serves two-fold purposes. Firstly, the spacer strip arrangement restricts lateral movement of the latticed beams 17 which are made of less costly round bars and prevents the latter from buckling or otherwise becoming deformed when a concrete slab 28 is cast over the supporting structure.
  • the spacer strips 24 are disposed in contact with the corrugated sheet 27 over which a concrete is cast, they transfer the load of concrete for concentration at the stronger part of the latticed beam structure, which lies at the upper hinges 21 of the beams, thereby avoiding direct load distribution through the relatively weak mid-portions of the upper chords 18 which lie between the hinges 21. It is in this connection important to locate and hook the spacer strips 24 at the upper hinges 21 of the latticed beams 17, for which purpose they may be provided if necessary with stopper means 29 as shown in FIG. 4 to prevent lateral movement of the upper chords 18.
  • FIGS. 5, 6 and 7, inclusive shows the second embodiment of this invention which is analogous in basic concept to the first embodiment hereinabove described.
  • the second embodiment offers the advantage that thickness of a concrete slab for a given design requirement may be substantially reduced and at the same time, height of the resulting floor slab as a whole above the base course may be considerably lowered. This advantage accrues from the following concrete supporting structure.
  • each latticed beam member 17 is provided with an upgrade slope 30 extending along the latticed chord 20, so that with the ends of the beam 17 secured on the longitudinal girders 11, the main horizontal portion of the beam 17 lies below the level of the top flange 14 of the girder 11.
  • These beam members 17 are held in position in a manner similar to the first embodiment by means of a plurality of spacer strips 24 each having a straight, horizontal portion 25, upright arms 31 and hook-like ends 32 as shown in FIG. 7.
  • the terminating groups of spacer strips 24 have their respective flat ends supported on and secured to ledges 3 3 projecting from the webs 16 of the transverse girders 12 as seen in FIG. 6.
  • Similar ledges 33' are formed on 'the webs of the longitudinal girders 11 for supporting thereon the ends of the corrugated sheets 27 arranged substantially at right angles to the spacer strips 24 as seen in FIG. 5.
  • the arms 31 and hook portions 32 of the spacer strips are embedded in the concrete layer so that these portions of the strips lend themselves to the effect of a combined beam with the latticed beam members 17 and thus augment the load supporting capabilities of the resulting concrete floor.
  • latticed Ebeam members 17 as used in the first embodiment illustrated specifically in FIG. 2 may be removed after the concrete slab is cured and hardened.
  • a concrete load supporting structure which includes a framework generally consisting of longitudinal and transverse wide-flange girders each having a top and a bottom flange and a web, said girders being crisscrossed at and carried on supporting columns, a plurality of latticed beam members extending in parallel with the transverse girders and arranged in a substantially parallel spaced-apart relation, each of which members 'consisting of an upper chord, a lower chord and a latticed chord connected therebetween, and having its ends supported on and secured to the longitudinal girders, a plurality of spacer strips arranged in a substantially parallel spaced-apart relation and in parallel with the longitudinal girders, each of which strips spanning over and interlinking two adjacent beam members at points where said latticed chords are hinged to said upper chords of the beam members, whereby a supporting bed in a criss-cross pattern is formed, and corrugated sheets laid over the bed and extending substantially

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Rod-Shaped Construction Members (AREA)
US844944A 1969-04-24 1969-07-25 Concrete load supporting structure Expired - Lifetime US3566567A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44031872A JPS4934782B1 (enrdf_load_stackoverflow) 1969-04-24 1969-04-24

Publications (1)

Publication Number Publication Date
US3566567A true US3566567A (en) 1971-03-02

Family

ID=12343113

Family Applications (1)

Application Number Title Priority Date Filing Date
US844944A Expired - Lifetime US3566567A (en) 1969-04-24 1969-07-25 Concrete load supporting structure

Country Status (2)

Country Link
US (1) US3566567A (enrdf_load_stackoverflow)
JP (1) JPS4934782B1 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189883A (en) * 1978-08-04 1980-02-26 Mcmanus Ira J Composite system for floor frame members
US4295310A (en) * 1979-08-22 1981-10-20 Mcmanus Ira J Precast concrete joist composite system
WO1984002550A1 (en) * 1982-12-22 1984-07-05 Johnny Johansson Prefabricated surface element of composite type
US20110203217A1 (en) * 2010-02-19 2011-08-25 Nucor Corporation Weldless Building Structures
US9004835B2 (en) 2010-02-19 2015-04-14 Nucor Corporation Weldless building structures
US10788066B2 (en) 2016-05-02 2020-09-29 Nucor Corporation Double threaded standoff fastener

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0445927U (enrdf_load_stackoverflow) * 1990-08-22 1992-04-20

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189883A (en) * 1978-08-04 1980-02-26 Mcmanus Ira J Composite system for floor frame members
US4295310A (en) * 1979-08-22 1981-10-20 Mcmanus Ira J Precast concrete joist composite system
WO1984002550A1 (en) * 1982-12-22 1984-07-05 Johnny Johansson Prefabricated surface element of composite type
US20110203217A1 (en) * 2010-02-19 2011-08-25 Nucor Corporation Weldless Building Structures
US8529178B2 (en) 2010-02-19 2013-09-10 Nucor Corporation Weldless building structures
US8636456B2 (en) 2010-02-19 2014-01-28 Nucor Corporation Weldless building structures
US9004835B2 (en) 2010-02-19 2015-04-14 Nucor Corporation Weldless building structures
US9267527B2 (en) 2010-02-19 2016-02-23 Nucor Corporation Weldless building structures
US10788066B2 (en) 2016-05-02 2020-09-29 Nucor Corporation Double threaded standoff fastener
US11815123B2 (en) 2016-05-02 2023-11-14 Nucor Corporation Double threaded standoff fastener

Also Published As

Publication number Publication date
JPS4934782B1 (enrdf_load_stackoverflow) 1974-09-18

Similar Documents

Publication Publication Date Title
US3302361A (en) Prefabricated bridge deck unit
US4227358A (en) Building element for construction of interlocking grids
US3066771A (en) Prefabricated bridge deck panels
US3398498A (en) Composite steel truss and precast concrete slab and beam units
US4628654A (en) Composite floor structures
US4027439A (en) Floor support for sectionalized buildings
US3566567A (en) Concrete load supporting structure
US2211513A (en) Reinforced structure
US3800491A (en) Ribbed concrete slab
CN109914665A (zh) 楼承板与装配式混凝土梁的连接结构
US1693941A (en) Building construction
US2078117A (en) Wall or floor structure and beams therefor
US3300932A (en) Concrete floor with embedded projecting truss
US3456415A (en) Truss construction
US2924310A (en) Long span deck member
US1851137A (en) Building construction
US3175653A (en) Deck construction
IL31725A (en) Floor construction
US2705886A (en) Prefabricated, reinforced floor structure
JPH11141036A (ja) 建物の床構成材ユニット及びそれを用いた床構造
KR100197760B1 (ko) 건축물의 콘크리트기둥과 철골보연결용 접합구조물
US2110110A (en) Reinforced concrete floor construction
JP4053946B2 (ja) 鋼板貼付け桁
US1995924A (en) Floor truss construction
JPS6222571Y2 (enrdf_load_stackoverflow)