JPH0337601B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a floating bridge that is loaded onto a transport vehicle and moved to an arbitrary location to construct an emergency bridge over a river.
In particular, the present invention relates to a mechanism for expanding and contracting the width of a bridge body and auxiliary floating body suitable for reducing the width of a vehicle during land transportation.

[Background of the invention]

A conventional floating bridge is made up of two main bridge bodies 2 connected by hinges 1 and auxiliary floating bodies 4 connected to both sides by hinges 3, as shown in Fig. 1, which is a cross-sectional view of the bridge state (unfolded state). , the vehicle 5 passes over it to cross the river. 6 is the water surface. in this case,
Since the load of the vehicle 5 needs to be supported by the increase in displacement (buoyancy) due to the sinking of the floating bridge, the bridge width B and the height (thickness) H of the bridge body and floating body need to be considerably large.

FIG. 2 shows a cross-sectional view of a conventional floating bridge in the state of being transported on land. The main bridge body 2 and the auxiliary floating body 4 are folded as shown in the figure, loaded onto a transport vehicle 7, and run on the ground 8.
As mentioned above, since the height (thickness) H of the bridge body and floating body is large, the width B' when folded is also quite large, making it difficult to drive on the road.

[Purpose of the invention]

The objects of the present invention are to reduce the resistance to flowing water in the bridge state (unfolded state), to make it easier for driftwood etc. to pass under the bridge, and to reduce the width of the bridge body so that it does not interfere with road traffic when transported on land. The objective is to easily reduce the size to a size that does not require a large size.

[Summary of the invention]

The present invention consists of a foldable main bridge body and an auxiliary floating body rotatably provided on the side of the main bridge body, and the main bridge body and the auxiliary floating body are folded and transported, and
In a floating bridge that is used while being deployed, and is provided so that the upper surface of the main bridge body and the upper surface of the auxiliary floating body are substantially at the same height when the auxiliary floating body is deployed. is configured to have a thickness smaller than that of the main bridge body, and is rotated to the lower surface of the auxiliary floating body so that a smooth slope connects the step that occurs on the lower surface of the auxiliary floating body and the main bridge body when the auxiliary floating body is deployed. It is characterized by having a bottom plate that can be used.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Figure 3 is a cross-sectional view of the bridge state (expanded state), in which two main bridge bodies 9 whose submerged parts are watertight and also serve as floating bodies are connected by a hinge 1 below the center, and to hinge 3 and coupling pin 10
Auxiliary floating body 1 whose height is smaller than the main bridge body 9 via
Combine 1. A lower plate 13 is connected to the lower side of the auxiliary floating body 11 via a connecting pin 12, and an actuator 14 is provided on the surface with the tip of the lower plate 13 to connect the lower plate 1.
3 can be taken in and taken out. In the bridge state shown in FIG. 3, the tip of the lower plate 13 is lowered by the actuator 14 to the same height H as the bottom of the main bridge body 9, reducing water resistance against the flowing water V, and lowering the lower surface of the floating bridge such as driftwood. make it easier to pass through. The actuator 14 pushes the rod with a screw or directly manually, or with a hydraulic cylinder or the like. The upper surface of the main bridge body 9 is a track bed plate 15 that also serves as a compression member, and the lower chord member 16 that serves as a tension member is provided at the lower part, and the web member 1 connects the two. Furthermore, when the floating bridge in Figure 4 is in the expanded state (bridge state) as shown in Figure 3,
The upper surface of the main bridge body 9 (track bed plate 15) and the upper surface of the auxiliary floating body 11 are provided so as to be substantially at the same height.

FIG. 4 shows a cross-sectional view of the vehicle being transported over land. The main bridge body 9 and the auxiliary floating body 11 are folded, and the lower plate 13 connected to the auxiliary floating body 11 by the connecting pin 12 is retracted by the actuator 14 and loaded onto the carrier vehicle 7.

According to this embodiment, when the bottom plate 13 is retracted, the height (thickness) of the auxiliary floating body 11 is reduced to H' by the operation of the actuator 14 compared to the bridge state (expanded state), The total width B' of the new bridge is smaller than that of the conventional bridge, and it can be made to a size that does not pose a problem for driving on the road. That is, the height (thickness) of the auxiliary floating body 11 is made smaller than the height (thickness) of the main bridge body 9 so that the overall width B' necessary for running on the road can be obtained. At this time, the buoyancy obtained by the auxiliary floating body 11 becomes smaller than that of the conventional one, but this is compensated for by an increase in the total sinkage or an increase in the bending rigidity of the bridge.

〔Effect of the invention〕

According to the present invention, by pulling out the bottom plate, it is possible to reduce the resistance to flowing water in the bridge state (unfolded state), making it easier to bridge in rivers with high flow velocity, and to prevent driftwood, etc. from hitting the step on the bottom of the bridge. Since the bridge can be passed easily without any collisions, it has the effect of preventing damage to the floating bridge due to collisions. Furthermore, by retracting the bottom plate, the overall width when transported on land can be reduced, which has the effect of making it easier to travel on the road.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional floating bridge in its bridge state, FIG. 2 is a cross-sectional view of a conventional floating bridge in a land-transported state, FIG. 3 is a cross-sectional view of a floating bridge according to the present invention in its bridge state, and FIG.
The figure is a cross-sectional view of the floating bridge of the present invention when it is transported on land. 1, 3...Hinge, 9...Main bridge body, 11...Auxiliary floating body, 12...Connecting pin, 13...Bottom plate, 1
4... Actuator.

Claims (1)

[Claims] 1 Consists of a foldable main bridge body and an auxiliary floating body rotatably installed on the side of the main bridge body, and the main bridge body and auxiliary floating body can be transported by folding and used by unfolding. In a floating bridge provided so that the upper surface of the main bridge body and the upper surface of the auxiliary floating body are substantially at the same height at the time of deployment, the thickness of the auxiliary floating body at the time of deployment is The auxiliary floating body is configured to have a thickness smaller than that of the main bridge body, and is rotatable to the underside of the auxiliary floating body so that a smooth slope connects the level difference that occurs on the lower surface of the auxiliary floating body and the main bridge body when the auxiliary floating body is deployed. A floating bridge characterized by having a bottom board.