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Multiple-span bridge support system for vehicles with high braking forces
| Details |
Inventors: Schambeck, Herbert; Hilliges, Dieter; Foerst, Hans;
Assignee: Dyckerhoff & Widmann Aktiengesllschaft (Munich, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
In a multi-span bridge support system, the superstructure includes a row of elongated single-span girders arranged end-to-end and supported at their ends on vertical support columns. At least two adjacent girders in a row are provided with fixed bearings at the juxtaposed ends over a common support column. The opposite ends of the girders are mounted on horizontally movable bearings. The location of the fixed bearing and the common support column forms a fixed point. At the fixed point the ends of the girders are notched so that the vertical and horizontal surfaces within the notched region face corresponding surfaces on the top of the support column. A vertical bearing for transmitting horizontal forces extending in the elongated direction of the girders, is located between the top of the support column and the juxtaposed vertical surface within the notched region of the adjacent girders. Tension members, extending perpendicularly to and through the vertical surfaces on which the vertical bearings are located, are fixed to the girders. The tension members extend through the support column and the girders without any bonding action therewith. Further, a horizontal bearing is mounted between the top of the support column and the horizontal extending surfaces within the notched region of the girders. |
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DETAILED DESCRIPTION OF THE INVENTION The superstructure of a bridge support system, embodying the present invention, includes a row of end-to-end single-span pre-stressed concrete girders supported on a row of support columns spaced apart in the elongated direction of the girders.
This arrangement can be noted in FIGS.
5 and 6 where the support columns axes A, B and C are assigned to the adjacent ends of a pair of single-span girders I and II in the embodiment of FIG.
5 and support column axes D, E, F and G in FIG.
6 corresponding to the adjacent ends of the single-span girders V, VI and VII.
In either embodiment, the support system can extend in both directions.
By using single-span pre-stressed concrete girders there is the advantage that the deformation which must be very closely followed along magnetic rails can be maintained.
In this arrangement there are no constraining forces during non-uniform settlement at the base of the arrangement under the support columns and simple assembly and disassembly is possible when the single-span girders are constructed as precast concrete structural components.
Moreover, concrete affords a high inherent weight and, accordingly, low eccentricities in the support and foundation, high stiffness or rigidity, and favorable damping characteristics with a resulting resistance to vibrations as well as a reduction in the sound level are provided.
A particularly important feature of the invention is the arrangement of the fixed point bearing effecting the transmission of horizontal forces extending in the long direction of the girders into the support columns.
This is shown particularly in FIGS.
1 and 2 or 3 and 4 through the example of the support column axis B of FIG.
5 and E' of FIG.
6.
In the embodiment illustrated in FIGS.
1 and 2, the single-span girders I, II have a hollow, closed, approximately trapezoidal cross-section formed by a pair of girder webs 2 extending downwardly from a roadway slab 1 to a base plate 3.
The webs converge inwardly toward one another from the roadway slab to the base plate
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