SE523664C2 - Mobile bridge and segments for such a bridge - Google Patents

Abstract

The invention relates to a mobile bridge, a segment and a sectional part for a mobile bridge. There are various types of mobile bridges; the invention relates mainly to a scissor-type bridge, which is usually transported on a tracked vehicle. The bridge according to the invention comprises two bridge halves (4, 5) joined by a link (6). Each bridge half (4, 5) has two segments (71, 72, 73, 74) comprising closed sectional parts (8) of extruded aluminium with stiffeners (9) in the form of a frame-work. The sectional parts (8) are joined by the welding method FSW (Friction Stir Welding) to form a load-bearing box section (10) comprising an upper part (11), two web parts (12, 13) and a lower part (14).

Description

25 30 35. . . . .n o ~ | »A - a | . ~ o. u - now document DE 32 44 576 A1 shows a bridge beam profile made of extruded aluminum profiles and aluminum plates which are joined together by gluing. This avoids the problems of reduced strength. On the other hand, the beam is built up with stiffening bulkheads and plates such as upper and lower parts. In order to achieve the bearing capacity required for mobile bridges for heavy loads, this type of construction would still be too heavy.

The invention solves the above problems through a mobile bridge comprising a closed extruded aluminum profile part comprising stiffeners according to the appended claims.

The invention will be described in more detail below with reference to the following figures: Fig. 1 Bridge on tracked vehicle.

Fig. 2a-b Lowered bridge from the side and from above.

Fig. 3 Profile part.

Fig. 4 Bridge half from above.

Fig. 5a Bridge segment from the side.

Fig. 5b-c Bridge segment in cross section AA and BB.

Fig. 6 Bridge segment in cross section.

Fig. 7 Bridge segment in cross section.

Fig. 8 Cross joint.

Fig. 9a Led from the side.

Fig. 9b Joint from above.

Fig. 10 Bridge end.

Fig. 11a-b First wire guide from the side and in cross section.

Fig. 11c-d Second wire guide in cross section and from the side.

Fig 12 End of a bridge half.from the side.

Fig. 13 Bridge half in cross section DD.

Fig. 14 Bridge half in cross section EE.

Figure 1 shows a mobile scissor bridge (1) arranged on a carrier, usually a trolley (2).

The crawler (2) is equipped with a laying device (3) which i.a. comprises an arm detachably arranged at the bridge (1). 10 15 20 25 30 35 523 664 3. .

Figure 2a-b shows a laid bridge (1). The bridge consists of two bridge halves (4,5) connected by a joint (6). Each bridge half (4.5) comprises two segments (71.72; 73.74) which form a carriageway.

Figure 3 shows a preferred embodiment of a profile part (8). The profile part (8) is made of extruded aluminum and has a closed profile, mainly square, and a stiffening interior in the form of a truss construction (9).

The protein part may also have a stiffening in another form or of another material, e.g. foam.

Figures 4 and 5a show a bridge half (4) from above and from the side. The bridge half comprises two segments (71.72) which are held together by crossbars (50.51). At one end of the segments (71, 72) there is a bridge end (30) which is used as an access area for vehicles. At the other end of the segments (71.72) the joint (6) and a wire guide (20, 21) are arranged. The load-bearing drawer profile (10) looks different in the segments. Figures 5a-5b show the cross-sections AA and BB, respectively. Section CC is shown in Figure 7.

Figure 6 shows a cross section of a segment (71,72,73,74). The cross section has a closed profile, drawer profile (10), consisting of four parts, an upper part (11), two living parts (12,13) and a lower part (14). The parts (11,12,13,14) are joined by any suitable method, e.g. welding or gluing. All parts preferably consist of a number of composite profile parts with the FSW welding method, Friction Stir Welding (8).

The welding method FSW, Friction Stir Welding, consists of rotating a pin between the edges to be welded together. Through the rotation, the material is stirred together and a very homogeneous and pore-free weld is formed. The joint has basically the same strength as the base material. By making the welding depth slightly larger than the thickness of connecting parts, the weld can be made stronger than connecting parts. With other welding methods, you get a reduction in the strength of the heat-affected zone, HAZ, Heat Affected Zone. With the materials that are common in extruded aluminum profiles, the reduction is approximately 40% in HAZ.

In Figure 6, four profile parts (8) are joined to an upper part (11). The body parts (12,13), consisting of two profile parts (8), are vertical and are welded or glued to the upper part (11). Due to the fact that both the webs (12, 13) and the upper part (11) have great torsional rigidity in the cross joint, no transverse joints are needed other than possibly at the joint (6), at (40) and at the crossbars (50,51).

The lower part (14) preferably consists of profile parts (8) welded together according to the FSW method. Optionally, they are reinforced with glued carbon fiber strands (not shown) that are anchored to the joint (6). Alternatively, the lower part (14) may comprise a plate, beam construction or the like.

The web (12,13) according to the construction becomes sufficiently flexurally rigid for it to be possible to fasten cross joints (50,51,55), lifting bolts, guide rails for wires, etc. in a simple manner. The attachment is suitably done by screw joints or gluing to avoid affecting the strength by e.g. welding. Figure 8 shows an example of how crossbars (50,51) and diagonal crosses (55) can be attached. The crossbars (50,51) and the diagonal crosses (55) are fixed in T-beams (53,54) which are attached to the underside of the upper part (11) and to the body parts (12,13) of the various segments (71, 72; 73 , 74).

The lower T-beams (54) are welded to a plate (56) and a transverse support beam (52). The plate (56) is fixed in the web (12,13) by a number of screw connections (57).

One of the important differences from known scissor bridges which are built with box beam steel and get their rigidity and bearing capacity through stiffening bulkheads and / or trusses is that the invention uses extruded box profiles which together form a large box profile as a load-bearing structure. In the bridge shown, the tire, waist and lower part consist of identical profile parts. The advantage is that only one profile tool needs to be developed. However, this means that the waist and lower part are oversized. For larger production, a number of different profile parts can instead be used. These can be more adapted to their function and stress, which can further reduce the weight.

Figure 7 shows section CC in Figure 5a. The drawer profile (10) is provided near the bridge end (30) with support body parts (41) outside the body parts (12, 13) and a central support (42) in the middle of the segment. The additional support parts (41, 42) provide support to the upper part within the access area for the bridge. The part closest to the bridge end, approx. 1 meter, is also used as a support for the bridge, ie. abuts the ground during use. The figure also shows lugs (40) which support corresponding lugs on the other half of the bridge when the bridge v- ~ e espn .- u ~ 10 15 20 25 30 35 525 664 n u «» f. 5 is folded. The lugs (40) are placed directly under the body parts (12,13) to withstand the impact load when the bridge halves collapse.

Figures 9a-b show an example of how a joint between the bridge halves can be designed. The hinge comprises hinge parts (61, 62) which are arranged at the lower part (14) of the segments.

The hinge parts (6162) in the figure are made of extruded aluminum and glued (64) to the segments (71, 73). Another embodiment of the joint (6) is to use a milled and drilled profile of aluminum or steel which is glued or welded to the segments (71,73). The hinge parts (61,62) are connected by a shaft (63) running along the entire length of the hinge (6).

Figure 10 shows a bridge end (30). The upper part (11) of a segment is welded in the lower part (14) and also in an end profile (31), of aluminum. The end profile (31) has a fastening device, e.g. in the form of a nut joint (33), which attaches a wear profile to the end profile.

The wear profile (32) can also be made of aluminum, but is preferably made of stainless steel to have better resistance to mechanical damage.

When laying, the bridge is first raised to a vertical position, then the parts of the bridge are folded apart by means of a wire device according to known construction, see e.g. Swedish Army's Brobandvagen 971A.

The segments have a wire guide (20,21) arranged at one end of the segments (71.72, 73.74). Figures 11a-b show a first wire guide (20) arranged at one of the segments (71) in a bridge half. Figures 11c-d show a second wire guide (21) arranged at the second segment (72) in the same half of the bridge. Figure 11c also shows how a first wire guide (20) from the second half of the bridge fits between the box construction and the second wire guide (21) when the bridge is extended. The wire running in the wire guide (20,21) is guided along the curved surface in a strip (25) which is screwed into or otherwise detachable from the wire guide (20,21). When the strip (25) is worn, it can be easily replaced instead of having the entire wire guide (20,21) replaced. The wire guide (20, 21) can be made of steel or aluminum, but preferably a profile part is used which is cut to a suitable shape and given brackets for the strip (25). Figure 12 shows one end of a bridge half with a joint (6). Figure 13 shows the section DD from Figure 12. Two bridge segments (71.72) are placed with a space next to each other. the wire guide (20) is fixed by screw connections in a web part (12) of the s uqv- wo une- v: 10 15 20 523 664 6. one segment (71) and the other wire guide (21) are attached to the web portion (13) of the other segment (72).

Fig. 14 shows the section EE in Fig. 13. The joint (6) which comprises a hinge part (61) is arranged at the segment (72) and a corresponding hinge part at the corresponding segment in the other half of the bridge.

The upper side of the upper part, the roadway, can suitably be provided with a non-slip coating, the outer areas of the bridge segments should have a thicker coating than the inner area because the wear from tracked vehicles is greater than wheeled vehicles. Without or in combination with a non-slip coating, a non-slip protection can be achieved by giving the grooves (81), see figure 3, on the roadway a deformation (82), pressed down, at regular intervals.

The present invention relates to a mobile scissor bridge, segment and profile of such a bridge. The profile is made of extruded aluminum and has a closed profile with a stiffener, preferably a truss. The segment is made up of several profiles joining the FSW welding method. The segment has a load-bearing box construction, which when the segments are joined together through a joint to the bridge gives the bridge its rigidity and bearing capacity. Segments and profile parts can also be used with or without modification for other types of mobile or stationary bridges.

Claims (15)

10 15 20 25 30 35 n Q,,,. 525 664 ø u u | . ,, PATENTKRAV A scissor-type mobile bridge, comprising two bridge halves (4,5) interconnected via a joint (6), characterized in that a bridge half (4,5) comprises a segment (71, 72,73,74), which comprises at least two closed profile parts (8), of extruded aluminum comprising stiffeners (9), joined together to form a load-bearing lead profile (10). Mobile scissor bridge according to claim 1, characterized in that the stiffeners (9) form a truss. Mobile scissor bridge according to one of Claims 1 to 2, characterized in that the profile part (8) and the stiffeners (9) are manufactured as a part by extrusion. Mobile scissor bridge according to one of Claims 1 to 3, characterized in that the segment (71,72,73,74) comprises at least two profile parts (8) joined together by the welding method FSW (friction-stir-welding). Mobile scissor bridge according to claim 1, characterized in that the box profile comprises an upper part (11), two body parts (12, 13) and a lower part (14) and that at least one of the parts comprises two profile parts (8), with closed profile comprising a stiffener (9), of extruded aluminum joined to the FSW (Friction Stir Welding) welding method. Mobile scissor bridge according to one of Claims 1 to 5, characterized in that the profiles are reinforced with glued-on strings of carbon fiber which are anchored to the joint (6). Mobile scissor bridge according to one of Claims 1 to 6, characterized in that a segment (71, 72, 73, 74) is joined to the joint (6) by gluing. Mobile scissor bridge according to one of Claims 1 to 7, characterized in that the joint (6) comprises a hinge part (61, 62) made of extruded aluminum. 10 15 20 25 a a a n .. Mobile scissor bridge according to any one of claims 1-8, characterized by a laying device comprising a wire guide (20,21), arranged at the end of each segment (71,72,73,74), comprising at least one profile part (8) and a wear strip (25) removably arranged along the curved part where the wire runs. Segment of a mobile bridge, comprising three parts, upper part (11), waist part (12, 13) and lower part (14), two profile parts (8), with closed profile comprising stiffeners (9), of extruded features characterized in that at least one of the parts comprises aluminum which is joined with the welding method FSW (Friction Stir Welding). Segment according to claim 10, characterized in that an upper part (11), a lower part (14) and two body parts (12, 13) are joined to a closed supporting drawer profile (10). 12. characterized in that the atto part (11) and the body parts (12,13) comprise two or more profile parts (8) joined to the welding method FSW (Friction Stir Welding). Segment according to claim 11, 13. (14) comprises two or more profile parts (8) joined to the welding method FSW (Friction Stir Welding). Segment according to claim 12, characterized in that the lower part 14. (14) comprises a plate, beam structure or the like. Segment according to claim 12, characterized in that the lower part 15. that the upper part (11), lower part (14) and the body parts (12,13) are joined together by Segment according to any one of claims 11-14, characterized by welding or gluing. I I o n oo n n ø n u | v ..