EP0352196A1 - Offene-Portal-Stahlbetonbrücke - Google Patents

Offene-Portal-Stahlbetonbrücke Download PDF

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Publication number
EP0352196A1
EP0352196A1 EP89402082A EP89402082A EP0352196A1 EP 0352196 A1 EP0352196 A1 EP 0352196A1 EP 89402082 A EP89402082 A EP 89402082A EP 89402082 A EP89402082 A EP 89402082A EP 0352196 A1 EP0352196 A1 EP 0352196A1
Authority
EP
European Patent Office
Prior art keywords
slab
pedestal
prestressing
cables
foot
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.)
Ceased
Application number
EP89402082A
Other languages
English (en)
French (fr)
Inventor
Philippe Lambert
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.)
Campenon Bernard SA
Original Assignee
Campenon Bernard SA
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 Campenon Bernard SA filed Critical Campenon Bernard SA
Publication of EP0352196A1 publication Critical patent/EP0352196A1/de
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D1/00—Bridges in general
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/02—Piers; Abutments ; Protecting same against drifting ice
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/28—Concrete reinforced prestressed

Definitions

  • the present invention relates to a reinforced concrete bridge of the "open gantry" type, that is to say essentially consisting of a horizontal slab supported by two approximately vertical legs and integral with said slab, with, optionally, at least one intermediate support, the distance between a pedestal and the nearest support defining the span.
  • the invention relates more specifically to the problems of building bridges having a length of 16 to 40 meters, for one or two spans.
  • bridges of this type consist of a prestressed concrete slab, placed, without rigid connection, on the legs. This solution has the disadvantages that the slab has an appreciable thickness, and that the feet are the only ones to support the thrust of the earth and are therefore subjected to significant forces.
  • the problem to which the invention relates is therefore to provide a bridge whose slab is thinner than those which are currently used, and in which the legs do not have to undergo alone the thrust of the earth.
  • the invention provides a bridge of the type indicated at the beginning of this text, and which has the particularity that, simultaneously: - the slab is made of prestressed concrete, and - the pedestal, where it connects with the slab, has an equivalent thickness between one tenth and one twentieth of the span.
  • equivalent thickness is meant the thickness of a continuous, rectangular pedestal, of constant thickness over its entire length, and which would have the same moment of inertia with respect to the neutral axis as the pedestal considered.
  • I 1/12 of DH3 I being the moment of inertia
  • D the width of the structure
  • H the thickness of the foot.
  • the thickness H must be taken below this header.
  • the slab has gussets, that is to say that at the place where it is connected to the pedestal, it has a thickness of between 1 and 2 times its minimum thickness in the span.
  • the reinforced rigid connection between the pedestal and the prestressed concrete slab allows considerable reduction of the slab and the pedestal, resulting in appreciable savings on the mass of concrete to be used, and therefore a reduction in the price of comes back, as well as a particularly successful aesthetic aspect.
  • the longitudinal prestressing cables of the slab pass close to the upper face of the slab to the right of the internal face of the pedestal, then curve downwards to leave a sufficient distance.
  • the prestressing cone and the upper surface of the slab and at least two reinforcing bars located on either side of the vertical plane containing one of said prestressing cables rise approximately vertically on the side of the external face of the foot and bends upwards inwardly, ending approximately parallel to the upper face of the slab and at a distance from the latter at most equal to the distance from the prestressing cable to the same upper face.
  • said reinforcing bars end at their upper end, without substantially exceeding the vertical of the internal face of the pedestal.
  • These reinforcements can possibly be replaced by cables or bars of vertical prestressing arranged in the foot, the anchorages of these cables or bars being arranged near the upper level of the slab and perpendicular to it.
  • An additional connection made by reinforced concrete reinforcements of small or medium section remains essential.
  • the external face of the pedestal is inclined towards the outside and ends on a horizontal surface capable of serving as a support for a transition slab.
  • This modality has the advantage of a very simple formwork of the external face of the pedestal, which can be flat. Above all, it allows a serious saving of material, by putting the maximum moment of inertia of the pedestal in the vicinity of its connection with the slab. The width of the foot near its foot may be much less than it is at the point of the bond.
  • the bridge of FIG. 1 comprises a slab 1, which is integral with the foot 2.
  • the slab 1 has a central part of constant thickness, and at its two ends, it forms gussets, the maximum thickness of which is greater than about 65% to that of the central part.
  • the gussets 2 have enlarged soles at their base 4. They have a trapezoidal shape, with, on the inside, that is to say facing the axis of the bridge, a vertical face 5, and, on the outside, an outer face 6, clearly oblique, inclined outward with a slope of about 13 °.
  • the width of the foot at its top is thus almost four times greater than what it is at its connection with the sole 4.
  • the actual thickness of the connection made with the slab is only slightly greater than three times the width of the foot at the level of the sole.
  • a horizontal surface 8 surmounts a part of the foot, so as to constitute a bearing surface for a transition slab 9.
  • the surface 8 should obviously not be taken into account.
  • the width of the foot at the place 7 of the connection is, in a practical example, 1.6 m for a range of 23 m, a ratio of 1 / 14.5.
  • FIG. 2 is a view similar to FIG. 1, but relating to two spans, that is to say that it comprises, in addition to the elements listed above, a median support 10.
  • the same gussets 3 are provided at the junction of the slab and the gusset 10.
  • the width of the foot at the connection point 7 is 1.0 m for a span of 17.7 m
  • the thickness of the slab is 0.45 m in the middle of the span and 0 , 75 m at the link, giving a ratio of 1.65.
  • FIGS 3 and 4 are diagrams intended to illustrate the connection between the prestressing cables of the slab and the reinforcing bars of the pedestal.
  • the outer contours of the bridge are shown in phantom.
  • a longitudinal prestressing cable 12 of the slab 1 runs horizontally at a short distance from the upper wall 13 of the slab 1. At its outer end, it bends slightly downwards, so that the prestressing cone 14 either at a sufficient distance from the upper surface 13 to meet the rules of the art.
  • Two reinforcing bars 15 of the pedestal 2 comprise, from the bottom, a first section 16, inclined to the vertical and parallel to the external face 6 of the pedestal, then a vertical part 17, which is located a short distance from the vertical plane from the end 21 of the slab 1. From the zone 7 of connection of the slab and the foot, the iron 15 curves inwards in a part 18, to end in a horizontal part 19, located a short distance from the upper surface 13 of the slab 1, a little higher than the prestressing cable 12. As can be seen, the iron 15 passes a short distance from the prestressing cone 14 of the prestressing cable, the necessary distance being however respected. The end 20 of the iron 15 is located more or less vertically from the internal face 5 of the foot 2, for the reasons which have been explained above.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
EP89402082A 1988-07-22 1989-07-21 Offene-Portal-Stahlbetonbrücke Ceased EP0352196A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809930A FR2634503B1 (fr) 1988-07-22 1988-07-22 Pont en beton arme du type " portique ouvert "
FR8809930 1988-07-22

Publications (1)

Publication Number Publication Date
EP0352196A1 true EP0352196A1 (de) 1990-01-24

Family

ID=9368680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402082A Ceased EP0352196A1 (de) 1988-07-22 1989-07-21 Offene-Portal-Stahlbetonbrücke

Country Status (2)

Country Link
EP (1) EP0352196A1 (de)
FR (1) FR2634503B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2759722A1 (fr) * 1997-02-17 1998-08-21 Quille Entreprise Perfectionnements au ferraillage d'un piedroit en beton arme comportant un corbeau d'appui et application a un piedroit destine a supporter le tablier d'un pont
EP1845199A2 (de) 2006-02-13 2007-10-17 Asahi Engineering Co., Ltd. Plattenbrücke
CN101914891A (zh) * 2010-05-11 2010-12-15 何成俊 人行道内两车道梁式桥端钢筋混凝土框架墩台基础

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1327874A (fr) * 1962-04-11 1963-05-24 Pont
DE1220879B (de) * 1961-02-23 1966-07-14 Polensky & Zoellner Unterfuehrungsbauwerk und Verfahren zu seinem nachtraeglichen Einbau

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1220879B (de) * 1961-02-23 1966-07-14 Polensky & Zoellner Unterfuehrungsbauwerk und Verfahren zu seinem nachtraeglichen Einbau
FR1327874A (fr) * 1962-04-11 1963-05-24 Pont

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
STRASSE UND VERKEHR, no. 10, 11 octobre 1971, pages 485-491; B. BERNARDI: "Brückenbauten bei Bisio (Chiasso-Balerna)" *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2759722A1 (fr) * 1997-02-17 1998-08-21 Quille Entreprise Perfectionnements au ferraillage d'un piedroit en beton arme comportant un corbeau d'appui et application a un piedroit destine a supporter le tablier d'un pont
EP1845199A2 (de) 2006-02-13 2007-10-17 Asahi Engineering Co., Ltd. Plattenbrücke
EP1845199A3 (de) * 2006-02-13 2013-10-23 Asahi Engineering Co., Ltd. Plattenbrücke
CN101914891A (zh) * 2010-05-11 2010-12-15 何成俊 人行道内两车道梁式桥端钢筋混凝土框架墩台基础

Also Published As

Publication number Publication date
FR2634503A1 (fr) 1990-01-26
FR2634503B1 (fr) 1990-09-21

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