JP2880396B2 - Bridge folding and unfolding device for emergency bridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for folding and unfolding a bridge section of an emergency bridge, which is loaded on a transport vehicle, moves to an arbitrary location, and temporarily constructs a bridge in a river or a space.

[0002]

2. Description of the Related Art Conventionally, an apparatus for folding and unfolding a bridge of an emergency bridge is described in Jane's Military Logistics, 1989, pp. 151-152, and 16;
7 to 168 (Jane's Military Logistics 19
89, PP151-152, PP167-168).

[0003] In any case, when the bridge is folded, a wire rope for lifting is passed through a hole drilled in the bridge floor plate to a lower side, and a hook at the tip is connected to a lower portion of the inner surface of the main girder to lift the bridge. Folding is performed using the lifting force.

[0004]

According to the above-mentioned prior art, the folding of the bridge can be performed relatively easily.
However, since it requires a complicated operation of passing a wire rope for lifting down from the hole drilled in the bridge deck and connecting the hook at the tip to the lower part of the inner surface of the main girder, automation can be done. In addition, since work is performed on the lower surface of the bridge above a river or the like, there is a danger.

[0005] It is an object of the present invention to enable automatic and danger-free folding of a bridge when lifting and lowering the bridge from the top of the bridge.

[0006]

According to the present invention, in order to achieve the above object, a main girder is hingedly connected to both left and right ends of a bridge deck, and the bridge deck is lifted horizontally below the hinge. In the state where the girder is suspended, it is located inside the perpendicular line connecting the hinge and the center of gravity of the main girder, and is lower than the lower end of the main girder in all processes from this state to the state where the main girder is finally folded The main girder is provided with rollers that protrude from the main girder and can roll in the folding direction.

[0007]

[Function] In the folding work of the bridge joint, first, release the supporting material fixing the main girder of the expanded bridge joint to the bridge deck, connect a wire rope to the upper surface of the bridge deck, and lift it with a crane or the like. The main girder rotates around the hinge and hangs below the bridge deck. Then, the main girder is stopped in a state where the center of gravity coincides with the position of the vertical line below the hinge. Next, when the bridge node is hung on the ground or the loading platform, the roller protruding from the lower end of the main girder contacts the ground or the loading platform surface, and a ground reaction force is generated vertically upward. Since this reaction force acts on the inside of the hinge of the main girder, when the bridge is further unloaded, the main girder rotates inward with the lateral movement of the roller, and the folding is completed.

Next, in the operation of unfolding the bridge, a wire rope is connected to the upper surface of the main girder of the folded bridge (which is turned sideways in the folded state) and lifted by a crane or the like. On the other hand, the lifting force acts upward.
Since this force acts outside the hinge of the main girder, when the bridge is lifted, the main girder rotates around the hinge and unfolds on both sides of the bridge deck.

As described above, since the wire rope is connected to the upper side of the bridge joint in both the folding operation and the unfolding operation, the operation can be performed with a simple operation and automation can be easily performed. It is safe because no work is required.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 to 5, and another embodiment will be described with reference to FIGS. In each of these embodiments, the operation of folding the bridge section can be performed on the upper surface of the bridge deck.

First, the overall structure of the emergency bridge will be described with reference to FIGS. Fig. 1 is a side view of the emergency bridge, Fig. 2
FIG. 2 is a sectional view taken along a line 2-2 in FIG. 1. In FIG. 1, the erection guide beam 30 at the lower part of the bridge is first connected aerial, and it is supported on the near shore 60 and the far shore 61 by jack devices 40, 40 which can be moved up and down. The bridge 62 is completed by sequentially extruding from the near shore 60 to the far shore 61 while being connected, and the jack devices 40, 40 are contracted to ground the lower surfaces of both ends of the bridge 62. The vehicle 63 passes.

In FIG. 2, a bridge section 10 includes a bridge deck 11
Main girders 13 and 13 rotatably connected to the left and right ends thereof by hinges 12 and 12; support members 14 and 14 capable of holding and releasing the main girders 13 and 13 in the deployed position; ,
The roller 15 is attached to a lower part of the outside of the vehicle 13 and is capable of rolling in the left-right direction.

FIG. 3 is a rear view of the emergency bridge on land when the bridge 10 is folded to reduce its width.
0 is loaded on the loading bed 51.

FIGS. 4 and 5 show a process on the way from the state shown in FIG. 2 in which the bridge node 10 is expanded to the state shown in FIG.

FIG. 4 shows that the supporting members 14 and 14 of the bridge section 10 supported by the erection guide beam 30 indicated by the imaginary line are released, and the wire ropes 17 are attached to the suspension fittings 16 and 16 provided on the upper surface of the bridge floor plate 11. , 17 are joined to lift the bridge joint 10, and the main girders 13, 13 rotate around the hinges 12, 12 and hang below the bridge deck 11, and the main girders 13, 1
The center of gravity 18, 18 of 3 is stationary in accordance with the lower perpendicular line of the hinges 12, 12.

In this state, the center of each of the rollers 15, 15 is located inside the vertical line (distance A> 0), and the lower surface thereof projects downward from the lowermost end of the main beams 13, 13 (distance A). B> 0), attached to the main girder 13, 13,
It is designed to be able to roll inward in the lateral direction. This is the first requirement of the present invention.

FIG. 5 shows a state in which the bridge node 10 is being unloaded onto the ground or the bed 51. The ground reaction force (R) of the rollers 15, 15 is generated vertically upward, and this force causes the main girder 13 to move downward. , 13 rotate inward around hinges 12,12. With this rotation, the rollers 15, 15 roll inward in the lateral direction.

In this process, at all the posture angles until the main beams 13, 13 are completely folded, the lower surfaces of the rollers 15, 15 always project downward from the lowermost end of the main beams 13, 13 (distance). B> 0) the main girder 13,
13. This is the second requirement of the present invention.

If the condition of A> 0 is satisfied in FIG. 4, since the main beams 13, 13 are rotating inward in FIG. 5, the positions of the rollers 15, 15 are shifted from the perpendicular of the center of gravity. A> 0, and the distance C from the perpendicular to the hinge is C> 0. However, the amount B of lower surface protrusion of the rollers 15, 15 decreases as the main beams 13, 13 rotate inward.
In this case, it is not sufficient that B> 0 is satisfied, and it must be always installed at a position where B> 0 until the folding is finally completed, including FIG.

The positions of the rollers 15, 15 satisfying both the first and second requirements are near the lower end corners of the main beams 13, 13, and depend on the positional relationship between the hinges 12, 12 and the centers of gravity 18, 18. May be slightly shifted left and right from the corner.

When the bridges 10 are further unloaded from the state of FIG. 5 and the main girders 13 are completely folded,
State.

FIG. 9 shows a folding method according to the prior art, and shows a state of the folding process corresponding to FIG. 5 of the present invention.

In FIG. 9, wire ropes 17, 17 are passed through wire rope holes 19, 19 of the bridge deck 11, and
When the bridge node 10 is lifted by being connected to the lifting brackets 20, 20 provided inside the third, 13 and 13, the lifting force is increased by the hinges 12, 1.
Since it acts on the main girders 13, 13 through the inside of 2, the main girders 13, 13 are folded inward with the lifting.

The method of the present invention differs from the method of FIG. 9 in that the wire ropes are connected at different positions and in FIG. 9 the folding operation is performed by lifting, whereas in the present invention, the folding operation is performed by unloading. is there.

When the bridge having the folding mechanism of the present invention is developed, the same method as in the related art is used. This is shown in FIG.

FIG. 6 shows a process on the way from the state of FIG. 3 in which the bridge node 10 is folded to the state of FIG.

In FIG. 6, the wire ropes 17, 17 are connected to suspension fittings 21, 21 provided on the upper surfaces of the main girders 13, 13 (which are turned sideways in the folded state).
Is lifted, the lifting force acts on the main girders 13, 13 through the outside of the hinges 12, 12, so that the main girders 13, 13 are deployed on both outer sides of the bridge deck 11 with the lifting.

7 and 8 show another embodiment of the bridge folding and unfolding device. This is a case where the width of the erection guide beam 30 is wide, and as an example, such a configuration is adopted in a case where the erection guide beam 30 is provided with buoyancy to serve also as a floating bridge.

FIG. 7 shows a cross-sectional view of a state where the bridge section is expanded, which is the same state as FIG. 2 of the first embodiment. In FIG. 7, rollers 22, 22 that can roll in the vertical direction are attached to the lower ends of the inner side surfaces of the main beams 13, 13. In addition, the erection guide beam 30 almost covers the space below the bridge floor plate 11.

FIG. 8 shows a support member (not shown) for the main girder 13.
Is released, and the bridge section 10 is lifted up in an initial stage. The main girders 13, 13 are slightly folded under their own weight, and the rollers 22, 22 contact both side surfaces of the erection guide beam 30, and roll upward. It is moving and being lifted.

The roller 2 is further lifted from this state.
When the reference numerals 2 and 22 are located above the erection guide beam 30, the state becomes the same as that of FIG.

In the case where the width of the erection guide beam 30 is wide, the conventional method shown in FIG. 9 cannot be folded, but the present invention is different in that it can be folded.

In the first embodiment of the present invention,
In the process up to the state shown in FIG. 4, the lower ends of the inner side surfaces of the main girders 13, 13 interfere with the side surfaces of the erection guide beam 30 and hinder the folding operation. Therefore, the state of FIG. It is necessary to release the support members 14 and 14 in the air after being lifted by the above, but in this embodiment, there is no such restriction.

According to the present embodiment, when the bridge is lifted and the main girder hangs below the bridge deck, it is located inside the center of gravity of the main girder, and in all processes from this state to the folded state. Since the main girder is provided with a roller which always protrudes downward from the lower end of the main girder and is capable of rolling in the horizontal direction, when the suspended bridge is unloaded onto the ground or the bed, it is automatically folded. In addition, since the main girder is provided with a roller protruding from the lower end of the inner side surface of the main girder and capable of rolling up and down, there is an effect that folding can be performed even if the construction guide beam covers the lower part of the bridge deck.

[0035]

According to the present invention, a wire rope is connected to the upper surface of a bridge node and lifted up, and then automatically lowered when the wire rope is unloaded onto the ground or a cargo bed. Therefore, folding of the bridge node and loading on a transport vehicle can be performed. Since it can be automated and does not require work on the lower surface of the bridge, there is an effect that the work can be performed safely.

According to the present invention, the width of the bridge on which the bridge is installed can be widened, and the bridge can be loaded on a transport vehicle having a small width.
There is an effect that the passing vehicle can pass safely and easily, and can move to the erection point quickly and easily.

[Brief description of the drawings]

FIG. 1 is a side view of an emergency bridge in a bridge state according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a cross-sectional view of the emergency bridge in a land running state.

FIG. 4 is a cross-sectional view of a state where a bridge node is suspended in the air.

FIG. 5 is a cross-sectional view showing a state in which a bridge is being folded down and folded.

FIG. 6 is a cross-sectional view of a state in which the camera is being developed.

FIG. 7 is a cross-sectional view of an emergency bridge in a bridge state according to another embodiment of the present invention.

8 is a cross-sectional view of the bridge node of FIG. 7 at an initial stage of lifting.

FIG. 9 is a cross-sectional view of a state during folding according to the related art.

[Explanation of symbols]

Reference numeral 10: bridge section, 11: bridge deck, 12: hinge, 13: main girder, 15, 22: roller.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Wakabayashi 794, Higashi-Toyoi, Kazamatsu, Kudamatsu City, Yamaguchi Prefecture Inside the Kasado Plant of Hitachi, Ltd. (72) Ryoyoshi Kaji 794, Higashi Toyoi, Kudamatsu, Yamaguchi Prefecture, Ltd. Inside the Kasado Plant (58) Fields surveyed (Int. Cl. ⁶ , DB name) E01D 15/12

Claims (2)

(57) [Claims] 1. A bridge section in which the left and right main girders can be folded down to the lower part of a bridge deck by hinges to reduce the width, the bridge deck is lifted horizontally, and the main girders are suspended by their own weight below the hinges and stopped. In this state, it is located inside the vertical line connecting the hinge and the center of gravity of the main girder, and protrudes below the lower end of the main girder in all processes from this state to the state where the main girder is finally folded. A bridge folding and unfolding device for an emergency bridge, wherein a roller capable of rolling in the folding direction is provided on the main girder. 2. An apparatus according to claim 1, wherein said main girder is provided with rollers which protrude from the lower end of the inside surface of the main girder and are capable of rolling in the vertical direction. apparatus.