US3550339A - Component member of constructions - Google Patents

Component member of constructions Download PDF

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Publication number
US3550339A
US3550339A US740295A US3550339DA US3550339A US 3550339 A US3550339 A US 3550339A US 740295 A US740295 A US 740295A US 3550339D A US3550339D A US 3550339DA US 3550339 A US3550339 A US 3550339A
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United States
Prior art keywords
concrete
pipe
steel pipe
members
component member
Prior art date
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Expired - Lifetime
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US740295A
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English (en)
Inventor
Hideo Yanai
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Individual
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Individual
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Publication date
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Publication of US3550339A publication Critical patent/US3550339A/en
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    • 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

Definitions

  • the present invention is concerned with an improvement in the basic component member structure, such as cross bars and girders, of constructions which are subjected to repeated application of bending load.
  • the stress which is created in a cross bar or a girder of a construction along a longitudinal sectional plane thereof varies in nature and direction with the positions in which the sections of the cross sectional plane of said girder are located. More specifically, the stress which is created in the section of a girder above the neutral plane thereof consists of a compressive stress, whereas the stress which is created in the section of the girder which is located below the neutral plane thereof consists of a tensile stress.
  • the operation started with the fabrication of the wooden frames into which wet concrete was to be poured. Then, iron bars or rods were arranged securely inside each frame. Thereafter, concrete was poured into the frames so as to have the iron bars or rods embedded therein. After the foregoing steps, the resulting filled-up frames were left to stand for a substantial length of time till the wet concrete dried up. Thus, the preparation of ferro-concrete cross bars or girders of the prior art consumed a lot of time and labor.
  • Another and more specific object of the present invention is to provide component members of generally horizontal load bearing constructions which are light in weight and money-saving and which are of a mechanical strength sufficient to resist the applied bending load, by the arrangement of each component member in such a way that it comprises an outer member consisting of a pipe made with a material having a sufiicient resisting property to the applied bending load, an inner member selected from the group consisting of pipe and shape article made with a material having a comparably resisting property to the applied bending load, and a mass of concrete packed tightly in the space defined by the inner member and the outer member, said arrangement being such that the applied tensile load is adapted to be borne by both the outer and the inner members and that the applied compressive load is adapted to be borne by said mass of concrete which is packed in said space.
  • FIG. 1 is a perspective view, with parts broken away, of one embodiment of the component member of construction of the present invention
  • FIG. 2 is a diagram showing the distribution of the load applied to a component member
  • FIG. 3 is a diagram of the bending moment which is created in the component member in FIG. 2 when the load is applied in the manner as shown in FIG. 2;
  • FIG. 4 is a longitudinal sectional view of an embodiment of the component member of the present invention which is arranged so as to cope with the bending moment which is created in such a way as is shown in FIG. 3;
  • FIG. 5 is a longitudinal sectional view of a part of the component member which embodies the present invention and which is located on a supporting member;
  • FIG. 6 is a longitudinal sectional view of a component member representing another embodiment of the present invention.
  • FIG. 7 is a longitudinal sectional view of a component member embodying the present invention and being applied as a girder of a bridge;
  • FIG. 8 is a cross sectional view of a plurality of those component members shown in FIG. 7 and arranged in side-by-side relations relative to each other and being taken along the line VIIIVIII in FIG. 7.
  • FIG. 1 which represents one example of the present invention
  • an inner steel pipe 2 is inserted in an outer steel pipe 1 which is of a inner diameter greater than the external diameter of said inner steel pipe 2.
  • the portion of the internal wall of the outer steel pipe 1 wherein it is brought into contact with the external wall of the inner steel pipe 2 which is inserted through the outer steel pipe 1 is welded to said portion of the inner steel pipe 2 so as to fix these two pipes firmly along the said portions of the walls thereof.
  • the space which is defined by the external wall of the welded inner steel pipe 2 and by the internal wall of the welded outer steel pipe 1 is filled densely and tightly with a mass of wet concrete 4 which is allowed to solidify in said space.
  • the inner steel pipe 2 is disposed in the outer steel pipe 1 in such a way that said inner steel pipe 2 is located on the side which is subjected to the tensile load which will be applied to the completed component member and that the mass of concrete 4 is located on the side which is subjected to the compressive load which will be applied to the completed component member. More specifically, the mass of concrete 4 and the steel members 1 and 2 are arranged in such a way that the mass of concrete 4 which is packed in the space defined by the external wall of the inner steel pipe 2 and the internal wall of the outer steel pipe 1 will bear the compressive load which will be applied to the completed component member and that the inner steel pipe 2 which is inserted in the outer steel pipe 1 will bear the tensile load which will be applied to the completed component member.
  • the mass of concrete 4 is of a sufficient force to resist the compressive load which is applied thereto, but it is poor in its resistance to the tensile load which is applied thereto.
  • Shape steel exhibits a greater mechanical strength against the applied tensile load than against the compressive load which is applied thereto.
  • FIG. 3 a diagram of moment which consists of such patterns of bending moment for each section of the component member. as are shown in FIG. 3. More specifically, the sectional bending diagram can be prepared in the form of a parabola which contains points of contrafiexure D and D located slightly within the supporting members A and B, as shown in FIG. 3.
  • this component member will, according to the present invention, have the following structure. Specifically, in order to cope with the blending moment which is created in the component member in a manner as illustrated in the bending moment diagram of FIG. 3, the inner steel pipe 2 which is contained in the outer steel pipe 1 and the mass of concrete 4 which is packed in the space formed between the inner steel pipe 2 and the outer steel pipe 1 are disposed, respectively, in a manner as shown in FIG.
  • the arrangement of the mass of concrete 4 and the inner steel pipe 2 are the inverse of that of the section which is subjected to a positive bending moment, that is to say, the inner steel pipe 2 is disposed closer to the top wall of the outer steel pipe 1 and the mass of concrete 4 is disposed in the space so that the mass of concrete 4 is located substantially beneath the inner steel pipe 2.
  • the relative positions of the inner steel pipe 2 and the mass of concrete 4 are inverted at the points of contraflexure D and D, so that the complete component members will each have a sufficiently and highly increased resistance to the bending forces applied thereto.
  • a mass of concrete 4 is packed also in the inner steel pipe 2 in the section thereof where it is located on the supporting member to prevent the component member from collapsing in case an overwhelming compressive load is exerted thereupon.
  • the inner steel pipe 2 may be substituted by a V-shape steel member 2' having a V-shape cross section, in such a way that this V-shape steel member 2 is inserted through the outer steel pipe 1 and that a mass of concrete 4 is filled in the space which is defined by the section of the inner wall of the outer pipe 1 between the edges of the diverging walls of the V-shape steel member 2' which are in contact with and fixed to said inner wall of the outer steel pipe 2 and also by the two diverging walls of the V-shape steel member 2 and also that the apex of the V-shape steel member 2 is welded to the inner wall of the outer steel pipe 1.
  • the material with which the outer pipe 1 and the inner pipe or shaped member 2 are formed is not limited to only steel, but instead, these members may be made with a reinforced plastic (F.R.P.)
  • the inner pipe 2 or the inner shape member is disposed within the outer pipe 1 on the side which is subjected to a tensile load, whereas the mass of concrete 4 is disposed on the side which is subjected to a compressive load.
  • the inner pipe 2 or the shaped member is disposed closer to the bottom wall of the outer pipe 1, whereas the mass of concrete 4 is disposed on top of said inner pipe 2 or the shaped member.
  • the component members X each having the aforesaid structure and being arranged in side-by-side relationship are fixed, by welding, to the steel plate 7.
  • the upper faces of these component members X are fixed, by welding, to the under face of another steel plate 8.
  • a layer of pavement 9 is formed on top of said steel plate 8, and as a result, there is formed a bridge, as will be noted in FIG. 7.
  • Component members of generally horizontal load bearing constructions each comprising an outer pipe having a circular cross sectional configuration and having sufiicient mechanical strength to resist a bending load applied thereto, an inner pipe having a circular cross sectional configuration but having an outer diameter smaller than the inner diameter of said outer pipe, said inner 20 pipe being inserted in said outer pipe and fixed to the inner wall of said outer pipe to divide the interior of said outer pipe into two spaces extending longitudinally thereof, and concrete filled in that space in said outer pipe surrounding said inner pipe inserted in said outer pipe, whereby as said bending load is applied to said outer pipe a part of the compressive stress created in said outer pipe is borne by said concrete.
  • Component members according to claim 1 wherein a mass of concrete is filled tightly also in the space in said inner pipe in the section thereof which is located on a supporting member supporting said component members.
  • a bridge structure comprising supports on which the end portions of said component members described in claim 3 are laid and fixed thereto.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Bridges Or Land Bridges (AREA)
US740295A 1967-07-03 1968-06-26 Component member of constructions Expired - Lifetime US3550339A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP42042370A JPS5016570B1 (de) 1967-07-03 1967-07-03

Publications (1)

Publication Number Publication Date
US3550339A true US3550339A (en) 1970-12-29

Family

ID=12634140

Family Applications (1)

Application Number Title Priority Date Filing Date
US740295A Expired - Lifetime US3550339A (en) 1967-07-03 1968-06-26 Component member of constructions

Country Status (4)

Country Link
US (1) US3550339A (de)
JP (1) JPS5016570B1 (de)
DE (1) DE1784022C3 (de)
GB (1) GB1211615A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858374A (en) * 1973-10-09 1975-01-07 Int Environmental Dynamics Triaxially prestressed polygonal concrete members
US3931772A (en) * 1973-03-28 1976-01-13 Paul Puccio Article of furniture and method of manufacture
US3967560A (en) * 1973-04-03 1976-07-06 Maschinenfabrik Augsburg-Nurnberg Ag Bending beam and method of making same
WO1988007934A1 (en) * 1987-04-08 1988-10-20 General Atomics Prestressed concrete articles and methods for manufacturing such articles
US4936006A (en) * 1989-03-01 1990-06-26 General Atomics Method of making prestressed concrete articles
US5065795A (en) * 1989-03-01 1991-11-19 General Atomics Prestressed concrete articles
US20120124937A1 (en) * 2010-05-24 2012-05-24 Jin-Guang Teng Hybrid frp-concrete-steel double-skin tubular beams and hybrid dstb/slab units using the beams

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60192007A (ja) * 1983-12-05 1985-09-30 川田工業株式会社 補剛桁型吊橋
GB8924080D0 (en) * 1989-10-26 1989-12-13 Llewellyn Lyn I D Improvements relating to structural beams
JPH10183533A (ja) * 1996-11-11 1998-07-14 Fujisen Kyoryo Doboku Kk 橋桁、橋桁構成体及び橋桁の施工方法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3931772A (en) * 1973-03-28 1976-01-13 Paul Puccio Article of furniture and method of manufacture
US3967560A (en) * 1973-04-03 1976-07-06 Maschinenfabrik Augsburg-Nurnberg Ag Bending beam and method of making same
US3858374A (en) * 1973-10-09 1975-01-07 Int Environmental Dynamics Triaxially prestressed polygonal concrete members
WO1988007934A1 (en) * 1987-04-08 1988-10-20 General Atomics Prestressed concrete articles and methods for manufacturing such articles
US4936006A (en) * 1989-03-01 1990-06-26 General Atomics Method of making prestressed concrete articles
US5065795A (en) * 1989-03-01 1991-11-19 General Atomics Prestressed concrete articles
US20120124937A1 (en) * 2010-05-24 2012-05-24 Jin-Guang Teng Hybrid frp-concrete-steel double-skin tubular beams and hybrid dstb/slab units using the beams

Also Published As

Publication number Publication date
DE1784022C3 (de) 1974-06-12
DE1784022B2 (de) 1973-11-15
DE1784022A1 (de) 1971-07-15
JPS5016570B1 (de) 1975-06-13
GB1211615A (en) 1970-11-11

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