US3608048A - Method for manufacturing a prebent girder embedded in concrete - Google Patents

Method for manufacturing a prebent girder embedded in concrete Download PDF

Info

Publication number
US3608048A
US3608048A US848791A US3608048DA US3608048A US 3608048 A US3608048 A US 3608048A US 848791 A US848791 A US 848791A US 3608048D A US3608048D A US 3608048DA US 3608048 A US3608048 A US 3608048A
Authority
US
United States
Prior art keywords
prebent
joist
flange
prebending
concrete
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
US848791A
Other languages
English (en)
Inventor
Abraham Lipski
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.)
PROCEDES NOUVEAUX DE CONSTRUCT
Original Assignee
PROCEDES NOUVEAUX DE CONSTRUCT
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 PROCEDES NOUVEAUX DE CONSTRUCT filed Critical PROCEDES NOUVEAUX DE CONSTRUCT
Application granted granted Critical
Publication of US3608048A publication Critical patent/US3608048A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • E04C3/294—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 of concrete combined with a girder-like structure extending laterally outside the element

Definitions

  • a rigid metal structure constituted essentially, on the one hand, by longitudinal elements arranged against the edges of said compressed flange and, on the other hand, by transverse connection elements, is temporarily applied to the compressed flange of the joist, said structure acting to avoid lateral buckling ofthe compressed flange.
  • This invention invention relates to a method for manufacturing a prebent girder embedded in concrete by first prebending the rigid metal joist of said girder, maintaining the joist prebent and then embedding the tension flange of said joist in a mass of concrete.
  • the compressed flange of the joist tends to undergo a lateral buckling under the effect of the compressive stresses, due to the prebending.
  • said joist In order to help the joist to undergo high prebending couples, without a danger of lateral buckling of its compressed flange, said joist has to be designed with a stiffness transversely to the prebending direction which is distinctly higher than the stiffness normally required in use. This results in an unnecessary and expensive waste of steel, and leads to a girder of an excessive weight.
  • the present invention meets these disadvantages.
  • the stiffness of the compressed flanges of the joists is temporarily increased in the direction transverse to the prebending.
  • a rigid metal structure is applied temporarily on the compressed flange of the joist, said structure being constituted essentially, on the one hand, by longitudinal elements, arranged against the edges of said compressed flange, and, on the other hand, by transversal connection elements and designed to prevent the lateral buckling of said compressed flange.
  • a lubricant is placed betweenv the longitudinal elements of the above mentioned structure and the edges of the compressed flange of the metal joist.
  • the longitudinal elements of the above mentioned structure are tightened against the edges of the compressed flange, so as to prevent their sliding on the latter during the prebending and to form a temporary frame for the compressed flange.
  • FIG. I is a plan view of the compressed flange of the prebent joist of a girder
  • FIG. 2 is a cross section along the line lI--II of FIG. I.
  • a rigid metal structure constituted essentially on the one hand, by longitudinal elements, such as angle irons 3 and 4 and on the other hand, by transverse connection elements, such as U-shaped irons 5, is applied temporarily on the compressed flange l of a metal joist 2.
  • Said metal structure presents a high stiffness in the direction transverse to the prebending direction.
  • the angle irons 3 are welded with one of their ends to the U- shaped irons 5.
  • the angle irons 4 are temporarily interlocked at their opposite ends to this U-shaped irons 5 by means of through bolts 6.
  • the position of each angle iron 4, relative to the U-shaped irons 5. is adjustable, as the latter bear several holes 7 for the bolts 6.
  • angle irons 3 and 4 are applied against the edges of the compressed flange I, eventually with an intermediary lubricant 8, by means of setscrews 9, screwed in the threaded blocks 10, integral with the U-shaped irons 5.
  • the angle irons 3 and 4 and U-shaped irons 5 constitute a so-called Virendeel-type structure, having a high rigidity in the plane of the angle irons 3 and 4, Le. in the direction transverse to the direction of the prebending. This structure consequently helps to maintain the flange l and avoids its lateral buckling under the effect of prebending.
  • the structure forms a guide for the deformation of the compressed flange 1, whose edges are slidable along the angle irons 3 and 4.
  • angle irons 3 and 4 When the angle irons 3 and 4 are tightened steadily against the compressed flange 1, in order to avoid their sliding on the edges of the flange under the effect of the prebending, these angle irons 3 and 4 absorb a part of the tensile stresses transmitted to said compressed flange 1. Thus, the angle irons 3 and 4 diminish the danger of a side tilt of the flange l and constitute a complementary frame for the same.
  • the metal-stiffening structure will preferably be constituted of a series of longitudinal elements 3 and 4, aligned coaxially and assembled end to end, for example by means of bolts, welds, etc.
  • a rigid metal, structure comprising longitudinal and transverse elements to a flange of the metal joist, prior to prebending said metal joist, which after prebending will be in compression, the longitudinal elements of said metal structure being arranged against the edges of the last-mentioned flange,

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)
US848791A 1968-08-19 1969-08-11 Method for manufacturing a prebent girder embedded in concrete Expired - Lifetime US3608048A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE62396 1968-08-19

Publications (1)

Publication Number Publication Date
US3608048A true US3608048A (en) 1971-09-21

Family

ID=3841095

Family Applications (1)

Application Number Title Priority Date Filing Date
US848791A Expired - Lifetime US3608048A (en) 1968-08-19 1969-08-11 Method for manufacturing a prebent girder embedded in concrete

Country Status (7)

Country Link
US (1) US3608048A (de)
AT (1) AT294665B (de)
DE (1) DE1941329A1 (de)
ES (1) ES370274A1 (de)
FR (1) FR2015882B1 (de)
GB (1) GB1273420A (de)
LU (1) LU59264A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133369A (en) * 1974-03-01 1979-01-09 Le Carbone-Corrane Fluid treatment modules
US4646493A (en) * 1985-04-03 1987-03-03 Keith & Grossman Leasing Co. Composite pre-stressed structural member and method of forming same
US4700516A (en) * 1981-11-25 1987-10-20 Keith And Grossman Leasing Company Composite, pre-stressed structural member and method of forming same
US5144710A (en) * 1991-02-28 1992-09-08 Grossman Stanley J Composite, prestressed structural member and method of forming same
US5978997A (en) * 1997-07-22 1999-11-09 Grossman; Stanley J. Composite structural member with thin deck portion and method of fabricating the same
US6668412B1 (en) * 1997-05-29 2003-12-30 Board Of Regents Of University Of Nebraska Continuous prestressed concrete bridge deck subpanel system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133369A (en) * 1974-03-01 1979-01-09 Le Carbone-Corrane Fluid treatment modules
US4700516A (en) * 1981-11-25 1987-10-20 Keith And Grossman Leasing Company Composite, pre-stressed structural member and method of forming same
US4646493A (en) * 1985-04-03 1987-03-03 Keith & Grossman Leasing Co. Composite pre-stressed structural member and method of forming same
US5144710A (en) * 1991-02-28 1992-09-08 Grossman Stanley J Composite, prestressed structural member and method of forming same
US5301483A (en) * 1991-02-28 1994-04-12 Grossman Stanley J Composite, prestressed structural member and method of forming same
US5305575A (en) * 1991-02-28 1994-04-26 Grossman Stanley J Composite, prestressed structural member and method of forming same
US6668412B1 (en) * 1997-05-29 2003-12-30 Board Of Regents Of University Of Nebraska Continuous prestressed concrete bridge deck subpanel system
US5978997A (en) * 1997-07-22 1999-11-09 Grossman; Stanley J. Composite structural member with thin deck portion and method of fabricating the same

Also Published As

Publication number Publication date
FR2015882A1 (de) 1970-04-30
FR2015882B1 (de) 1973-02-02
LU59264A1 (de) 1970-01-01
GB1273420A (en) 1972-05-10
ES370274A1 (es) 1971-04-01
AT294665B (de) 1971-11-25
DE1941329A1 (de) 1970-02-26

Similar Documents

Publication Publication Date Title
US4144686A (en) Metallic beams reinforced by higher strength metals
US4958473A (en) Frame, angle member for use in the frame and method of making joint portion of the angel member
US3010257A (en) Prestressed girder
US3362117A (en) Truss structure for beams
CN101025047A (zh) 外置横向预应力钢筋混凝土梁
US3608048A (en) Method for manufacturing a prebent girder embedded in concrete
US4704830A (en) Increasing the load carrying capacity of beams
US2675695A (en) Composite structure of metal and concrete
WO1999057390A3 (en) Anchoring method and apparatus in a prestress reinforcement
US2016616A (en) Reenforced concrete structure
CN102296751B (zh) 预应力抗疲劳钢梁
US3835607A (en) Reinforced girders of steel and concrete
US4079889A (en) Railroad track rail
CN108843040B (zh) 碳纤维板内曲面夹持式锚具
KR102345593B1 (ko) 보 보강 장치
AT234140B (de) Verfahren zum Vorspannen und Einbauen stabrostartiger Fugendichtungen für Dehnungsfugen in Straßen und Gehwegen, insbesondere für Fahrbahnübergänge an Straßenbrücken, sowie Fugendichtung zur Durchführung des Verfahrens
CN101012694A (zh) 内置横向预应力钢筋混凝土梁
KR102757505B1 (ko) H빔에 예압을 주는 방법
CN209686918U (zh) 一种体外预应力钢绞线连接器及张拉装置
CN221855310U (zh) 一种简支梁外包结构
GB1590092A (en) Method of lifting or reinforcing an existing structure
CN104762878B (zh) 具有预应力的简支梁桥桥面连续构造的施工方法
CH273887A (de) Kombinierte Metall- und Beton-Tragkonstruktion.
US3271008A (en) Apparatus for treating structural members
JP2774937B2 (ja) 既設鋼桁橋の補強方法