For each additional 10 feet the bridge is extended, its maximum load decreases by 200 pounds, to a minimum of 200 pounds at 30 feet in length. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). The coupling points between the individual track girder sections 31 have the reference number 11. Because the bridge is subdivided into individual predominantly one- or two-dimensionally stressed elements, the prerequisites are provided for the use of fiber composites, and low weights can therefore be achieved. For this purpose, two characteristics are particularly important: This applies particularly when the bridges have to be transported as air freight over large distances. Bailey bridges, Folding or telescopic bridges; Bridges built up from folding or telescopic sections, The United States Of America As Represented By The Secretary Of The Army, General Dynamics Santa Barbara Sistemas Gmbh, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FUESSINGER, REINHOLD;STEPPACHER, WALTER;REEL/FRAME:014967/0988, PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, Lightweight universal gap crossing device and method of use, Support for collapsible military bridge has side walls which are longitudinally split in middle, with side wall halves interconnected by first hinges, and by second hinges foldably connected to upper and lower boom, Modular structural layout, bridge construction system and bridge construction process, Suspension bridge preassembled abutment towers and anchorage, Fixed or floating bridge girder - has identical, foldable, prefab. This ability will only activate once per round. Collapsible Bridge. 2, the transverse girders 5 are bent at right angles in the area of the transition from the roadway into the track girders 3 so that the transverse girders are situated lower in the roadway area than inside a track girder. The coupling-together of the individual track girder sections 31 advantageously takes place at the upper chord O and the two lower chords U which, for this purpose may be constructed at their ends as eye bar connections. The bridge according to certain preferred embodiments of the invention is constructed as follows: A bridge constructed in this manner has the following advantages: The described construction of the track girders provides the prerequisite for a simple collapsing of the track girders. German Patent Document DE 2 250 013 A1 (corresponding GB Patent No. This application claims the priority of application no. The static connection of the two truss planes is optimally implemented with respect to weight by means of unreleasable connections. The invention relates to a collapsible bridge; that is, a portable bridge for mobile use. Collapsible Bridge will knock out two cards with Attack points on the opponent's field when it becomes knocked out. 5,724,691), a portable bridge is known whose track girders are force-lockingly connected by means of transverse girders. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof. The two base sides of the track girders each consist of a so-called quadrilateral beam. From German Patent Document DE 195 10 582 A1 (corresponding U.S. Pat. These may simultaneously be used as bridge bearings. They are force-lockingly connected with the transverse girders 5. In the embodiment illustrated in FIGS.

When opened, the bridge has a canvas surface 5 feet wide and anywhere between 10 and 30 feet in length. A chord profile is provided at each triangulation point and two corners of the triangular cross-section are situated at the same level with the third corner situated above the corner. An alternative thereto is illustrated in FIG.

Thus, there are no loose connection elements which could easily be lost in the terrain during rain, ice and snow and in darkness. Drive-up aids or ramps AF, which bridge the height difference between the river bank and the upper edge of the bridge roadway, are arranged between the end pieces E of the track girders 3.

Roadway planks are provided which are aligned in the longitudinal direction of the bridge and are force-lockingly connected with the transverse girders. Fixed bridges have the disadvantages of hindering the movement of boats which are higher than the bridge level on the watercourses. The net is pre-rigged with 50' of … 1 and 1A with a substantially flat transverse girder; FIG. A track girder 3 has two truss planes which are each mounted between the upper triangulation point and one of the two lower triangulation points. These constructions can be fixed or folding. the bridge can rapidly be built up and taken down. The transverse girders 5 rest on the base side of the triangle which is formed by the diagonal struts D and the chord profiles O, U. The points at which the diagonal struts D of the truss meet the lower or upper chord, U, O are called truss nodes K. The truss corresponds to the truss definition according to Cremona. 1 405 146) describes a portable bridge whose track girders have a triangular cross-section. Aligned in the span direction of the bridge, so-called roadway planks 7, which carry the traffic loads and place them on the transverse girders, are situated on the transverse girders 5. PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362. FIG. A collapsible bridge is a system of canvas, pipes and cables that folds into a small trunk.

The Frabill 1002 bridge/pier net has a heavy duty 36" diameter steel hoop with a 36" deep heavy black poly netting with 1 1/2" mesh. No. In this case, a transverse girder forms a part of the lower chord. Civil Engineering for the Evolutionary World.

The track girder 3 is open toward the bottom. 1A is a sectional view transversely to the longitudinal direction of the bridge showing the bridge Section BS of FIG. It is therefore an object of the invention to provide a bridge which provide at least one or more of the following advantages: This object is achieved according to certain preferred embodiments of the invention by providing a collapsible bridge having two track girders which are constructed as truss girders with a triangular cross-section, wherein a chord profile is provided at each triangulation point, and wherein two corners of the triangular cross-section are situated at the same level, and the third corner is situated above the latter, wherein, in each case, between one of the lower triangulation points and the upper triangulation point, a truss plane is formed comprising diagonal struts, the lower chord and the upper chord, wherein lower and upper truss nodes respectively are formed at the points of the connection of two diagonal struts and a lower chord and an upper chord respectively. Collapsible bridge, having two track girders which are constructed as truss girders with a triangular cross-section, wherein a chord profile is provided at each triangulation point, and wherein two corners of the triangular cross-section are situated at the same level, and the third corner is situated above the latter, wherein, in each case, between one of the lower triangulation points and the upper triangulation point, a truss plane is formed comprising diagonal struts, the lower chord and the upper chord, wherein lower and upper truss nodes respectively are formed at the points of the connection of two diagonal struts and a lower chord and an upper chord respectively. 1. ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FUESSINGER, REINHOLD;STEPPACHER, WALTER;REEL/FRAME:014967/0988, Free format text:

1, 1A, and 1B, constructed according to an embodiment of the invention; FIG. FIG. 3B). The transverse girders 5 rest on the lower nodes K of the two truss planes of the track girders 3 and are connected with the latter in a force-locking manner. The latter is defined by the condition s=2*n−3, wherein s=the number of rods and n=the number of nodes. Fixed bridges have the disadvantages of hindering the movement of boats which are higher than the bridge level on the watercourses. 1 is a lateral view of a bridge constructed according to a preferred embodiment of the invention comprising several bridge sections; FIG. It comprises two track girders which are constructed as truss carries with a triangular cross-section, two corners of the triangular cross-section being situated at the same level, and the third corner being above the latter, in which case a truss plane comprising diagonal struts, a lower and an upper chord is formed in each case between one of the lower triangulation points and the upper triangulation point of the track girder cross-section, lower and upper truss nodes respectively being formed at the points of the connection of two diagonal struts and a lower chord and an upper chord respectively; the two track girders are force-lockingly connected by transverse girders; roadway planks aligned in the longitudinal direction of the bridge are provided which are force-lockingly connected with the transverse girders; the transverse girders are fitted completely through the track girders and are force-lockingly connected with the latter, so that the transverse girders fix the spacing of the two truss planes on the underside of the track girder as well as the track girders with respect to one another. Here, a lower chord U is perpendicularly oriented in the folded-open condition; that is, the longitudinal side of the lower chord (the longer side of the rectangular lower chord) is in a perpendicular position with respect to a local horizontal plane. A low requirement with respect to transport space. 4 is a sectional view of another embodiment of a hinged track girder shown in the unfolded condition on the left and as well as in the folded condition on the right. In the embodiment according to FIG. 1; FIG. Portable bridges should be transported in a cost-effective manner with expenditures which are as low as possible. Collapsible lattice and frame construction, Composite bearing deck comprising deck panel and concrete, Composite beam having truss reinforcement embedded in concrete, Double network reticulated frame structure, Stiffening girder for a stayed cable bridge, Lapse for failure to pay maintenance fees, Information on status: patent discontinuation, Expired due to failure to pay maintenance fee.

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