JP6068681B2 - Scissor-type telescopic structure - Google Patents

Description

  The present invention relates to a scissors-type elastic structure including a scissors structure.

  Conventionally, many typhoons, heavy rains in the rainy season, heavy guerrilla rain, tsunami, etc. have caused many events that cause the bridge to be washed away or damage the bridge due to earthquakes. In addition, it is important to build a bridge in a short time in order to reduce the construction cost of a small bridge.

  In the past, heavy steel temporary girder bridges and truss bridge members have been transported and built in an assembly according to the situation at the disaster site so that private construction vehicles can pass through. It was. In addition to disasters, the construction method of structures by the overhang method, vent support method, and extrusion method is common, and the construction period of the construction took several days.

  By the way, the deployment type scissors link for shear reinforcement like patent document 1 is known. This scissor link is not bulky during transportation, storage, etc., and can be deployed during use to have a desired configuration and length.

JP-A-11-210161

  The scissors mechanism as in Patent Document 1 has been difficult to apply to large buildings such as bridges. The reason for this is that there is little utility for the function, the manufacturing cost is high due to the accompanying control device, and if the control member is not inserted as a structure, it may become an unstable structure, and it has robust rigidity in one direction. However, it can be considered that weak directions tend to be weak in other directions. In addition, there is a problem in that it is difficult to design for structural strength such as stress concentration and wear due to the presence of a hinge portion (pivot) at the member intersection.

  Therefore, if the floor slab is provided so that it can be stable when extended and the car can run, the number of parts increases, and in order to stand the floor slab from a horizontal state when it is folded again, However, a very large force is required, and the number of parts increases by the amount of the floor slab, resulting in a complicated structure and mechanism.

  This invention is made | formed in view of this point, The place made into the objective is to obtain the scissors type expansion-contraction structure with easy structure, and easy to carry, store, and expand | deploy.

  In order to achieve the above object, according to the present invention, the upper surface is made substantially flat in a state where the scissors structure is completely extended without providing a floor slab member.

Specifically, in the first invention,
A scissors-type telescopic structure that can be expanded and contracted in the extension direction is targeted.

And the scissors-type elastic structure is
A plurality of frame elements including two frame members that are pin-coupled to each other at the central portion have a scissor frame that is pin-coupled to each other at the tip of the frame member;
When the scissor frame is extended, the frame members on the front side of the frame element are linearly connected to each other, and the frame members on the back side are connected to each other in a straight line, so that the upper surface of the frame member is A continuous flat surface is formed.

  According to the above configuration, since the upper surface of the frame member becomes flat when the scissors frame is fully extended, the upper surface of the frame member plays the same role as the floor slab without providing a separate floor slab member. It also serves as a version that you have, and people and cars can pass through it. Since the scissors-type expansion bridge does not include a floor slab member, a large force is not required when standing up and storing from a horizontal state as when including a floor slab member. Further, since the floor slab member is not included, the number of parts is reduced, the structure is simplified, and the weight can be reduced. In addition, the flat surface here means not only a completely flat state but also a case where a state where a person or a vehicle can pass and the road surface is somewhat uneven is included. Further, a plate-like member may be placed on the extended floor member and firmly integrated with a bolt or the like.

In the second invention, in addition to the first invention,
By arranging a plurality of scissors frames toward the back side, a bridge girder is formed when the scissors frame is extended.

  According to the above configuration, when a plurality of scissors frames are arranged on the back side when used as a bridge girder, a distance in the width direction can be earned.

In the third invention, in addition to the first or second invention,
The frame member includes a scissors body having a center pin insertion hole provided in the center portion, and a floor member provided on the scissors body and forming the flat surface.

  According to said structure, since it has the function of a scissors structure and a floor slab structure with one frame member, a number of parts reduces and an assembly is easy.

In a fourth invention, in any one of the first to third inventions,
In the scissors frame at the time of extension, the positions where the frame members are connected to each other are shifted between the front side and the back side in plan view.

  According to said structure, the stress concentration by the load added when a heavy article passes is disperse | distributed by shifting a connection location.

In a fifth invention, in any one of the first to fourth inventions,
The scissors frame is supported at its lower end by a plurality of pontoons, and is expanded by increasing the distance between adjacent pontoons during expansion.

  According to said structure, if a pontoon is connected and towed on the water surface and the distance between pontoons is expanded on the spot, a temporary bridge can be easily installed on the water surface in the state where the lower end was supported by the pontoon.

In the sixth invention, in addition to any one of the first to fourth inventions,
An outrigger that can be placed on a trailer loading platform and that extends in the vertical direction outside the loading platform to support its own weight is provided.

  According to the above configuration, the scissors-type telescopic structure in the stowed state can be transported by loading it on the trailer platform, and after placing the platform on the ground using the outrigger on the site, moving the trailer and deploying it temporarily Bridges and the like can be provided very quickly and easily. Since there is an outrigger when it is stored and removed by a trailer, it can be placed on the loading platform without being lifted by a crane. Thus, by using an outrigger, it is possible to easily load and unload the scissors-type telescopic structure without preparing a special machine such as a crane.

  As described above, according to the present invention, since the upper surface of the scissors frame is flattened in a stretched state, the structure is simple, easy to transport, store and deploy, and stable when deployed. A scissors-type stretchable structure can be obtained.

It is a front view which shows a mode that the scissors-type expansion-contraction bridge concerning embodiment of this invention is extended. FIG. 2 is a view corresponding to FIG. FIG. 2 is a view corresponding to FIG. It is a front view showing chain scissors during expansion. The extended chain scissors are shown, (a) is a front view, (b) is a plan view, and (c) is a perspective view. The frame member is shown enlarged, (a) is a front view, (b) is a plan view, (c) is a bottom view, and (d) is a perspective view. 3 shows a chain scissors arranged in series in the width direction, (a) is a plan view and (b) is a perspective view. It is a front view which shows the outline of the example of expansion | deployment by the suspension bridge which concerns on the modification 1. FIG. The outline of the example of expansion | deployment by the pontoon which concerns on the modification 2 is shown, (a) is a front view at the time of accommodation, (b) is a front view at the time of expansion | extension. It is a front view which shows the scissors type expansion-contraction bridge on the loading platform of the trailer which concerns on the modification 3. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a state in which a scissors-type expansion bridge 1 as a scissors-type expansion structure according to an embodiment of the present invention is extended, FIG. 2 shows a state in which the scissors-type expansion bridge 1 is stored, and FIG. The state of standing from the state of is shown. The scissors-type expansion bridge 1 is configured to be extendable in the extension direction and to be flat when fully extended. Specifically, as shown in FIGS. 4 to 6, the scissors-type expansion bridge 1 is composed of two frame members 2 (pinned by a central pin insertion hole 2 a (shown in FIG. 6)) at a central portion. A plurality of frame elements 3 (see FIG. 4, including four) are provided with a plurality of scissor frames 4 that are pin-coupled to each other at the front end of the frame member 2. The frame member 2 has a tip pin insertion hole 2d at both ends and a scissors body 7 provided with a plurality of through holes 2b for weight reduction, and is provided above the scissors body 7 to form a flat surface. And a floor member 8. The frame member 2 may be formed of, for example, a lightweight and highly rigid hollow aluminum alloy extruded material, or may be formed of a three-dimensional optimum shape built member, or the scissors body 7 and the floor member 8 may be formed of different materials. And may be assembled. Since the single frame member 2 has the functions of the scissors structure and the floor slab structure, the number of parts is reduced and the assembly is easy, and the resistance accompanying the geometric structure of the floor slab can be reduced.

  As shown in detail in FIG. 6, a support notch 7 a is provided on the base end side of the scissors body 7, and the tip side is supported by contacting the support notch 7 a of the adjacent scissors body 7. A supported notch 7b is formed. The support cutout 7a and the support cutout 7b are stable so that they do not interfere with each other until they are extended to the maximum and are horizontal when they are extended to the maximum, so that the weight of a person or vehicle passing over the floor member 8 can be reduced. The shape needs to be supported.

  As shown in FIG. 4, one frame element 3 includes two frame members 2. By passing the central shaft 2 c extending horizontally through the central central pin insertion hole 2 a, the central shaft 2 c is made to pass through. At the center, each of the two frame members 2 is pivotably connected like scissors. When the scissors frame 4 is extended, the frame member 2 on the near side of the frame element 3 is linearly connected to each other, and the frame member 2 on the back side is linearly connected to each other, so that FIG. As shown in FIG. 2, a flat surface is formed in which the upper surface of the frame member 2 is continuous. Further, as shown in FIG. 5B, the scissors frame 4 at the time of extension includes a connection line A to which the frame member 2 on the near side is connected in plan view and a connection line B to which the frame member 2 on the back side is connected. It's off. In this way, stress concentration can be avoided by shifting the connection location. 1 to 7, the number of the frame members 2 and the like is limited for simplification, but the number is not limited.

  For example, as shown in FIG. 7, the width may be increased by arranging three scissor frames 4 in the width direction. The number of scissors frames 4 to be arranged may be determined by the relationship between the width of the floor member 8 and the width of the bridge girder necessary for the passing material.

  Furthermore, horizontal shafts 2e extending in the width direction of the scissors-type telescopic bridge 1 are connected to the tip pin insertion holes 2d at the ends arranged vertically. In this way, the frame elements 3 that are arranged side by side in the width direction are connected to each other by using the horizontal axis 2e that is connected to another frame element 3 adjacent in the extension direction and that is long in the width direction at an appropriate interval. Thus, the strength can be improved. It is ideal that all the floor members 8 become flat when extended, but a state in which a person or a vehicle can pass is created, and there may be some unevenness on the road surface. For example, a pair of scissors frames 4 is provided in the width direction, and the distance between the scissors frames 4 is matched to the width of the tires of the automobile (vehicle width), so that the vehicle can pass on the scissors frames 4. Note that the size of the chain scissors 6 in the width direction may be increased so that a plurality of ordinary vehicles C can pass simultaneously. In that case, at least a plurality of scissors frames 4 are parallel to the tire portion of the ordinary vehicles C. What is necessary is just to provide.

  In the scissors-type expansion bridge 1, a plurality of frame elements 3 including such a frame member 2 are connected so as to have a desired bridge girder length at the installation location. As shown in FIG. 1 and the like, one end of a chain scissors 6 including a frame element 3 composed of the plurality of frame members 2 is fixed to a gantry frame 10. The gantry frame 10 is installed on the installation surface P of the scissors-type telescopic bridge 1 and is made of, for example, a welded structure assembled in an L shape in a side view, and the frame member 2 extends to a vertical portion when deployed. A rail-shaped guide member 11 that determines the direction is provided. Although not shown in detail, a roller 11 a provided on the most proximal frame member 2 moves up and down in the vertically extending guide member 11 to control the extending direction of each frame element 3.

  The gantry frame 10 is connected to a rectangular frame-like base 12 that is long in the extending direction so as to be raised and lowered. Specifically, one end of the hoisting cylinder 13 is connected to the base end side of the base 12 in the extending direction, and the other end of the hoisting cylinder 13 is connected to the gantry frame 10. The base end side of the gantry frame 10 is rotatably connected to the rotation shaft 12 a of the base 12. As a result, the gantry frame 10 can be raised and lowered with respect to the base 12 as the raising and lowering cylinder 13 extends and contracts.

  For example, a fixing portion 18 for connecting and fixing the gantry frame 10 is provided on the distal end side of the base 12 in the extending direction. The presence or absence of the fixing portion 18 and its shape are not particularly limited.

  The scissors-type expansion bridge 1 includes a deployment assisting device 23 that assists the deployment and storage of the chain scissors 6. Specifically, on both sides in the width direction of the gantry frame 10, deployment speed adjustment cylinders 14 are provided as deployment speed adjustment means, and these deployment speed adjustment cylinders 14 deploy and store the chain scissors 6. It is configured to assist. For example, a first sprocket 15 is provided at the tip of the deployment speed adjustment cylinder 14, and is extended between the second sprocket 16 fixed to the lower side of the gantry frame 10 by expanding and contracting the deployment speed adjustment cylinder 14. The distance can be changed. A deployment chain 17 is hung on the first sprocket 15 and the second sprocket 16, one end of the deployment chain 17 is fixed to the gantry frame 10, and the other end is the second frame from the base end side in the extension direction. The tip of the member 2 is connected.

  Further, the deployment assisting device 23 includes, for example, one deployment cylinder 19. A cylinder tube of the developing cylinder 19 is fixed to the base 12, and an arm 19a extending vertically is projected from the tip of the rod. When the arm 19a contracts the developing cylinder 19, for example, the second horizontal shaft 2e from the base end side in the extension direction is pushed in the extension direction, whereby extension of the chain scissors 6 is started. After that, the chain scissors 6 are developed by their own weight.

  During expansion due to its own weight, the expansion chain 17 is pulled, and the expansion speed adjusting cylinder 14 is expanded to allow the scissors frame 4 to open. The deployment speed is adjusted by controlling the flow rate of the hydraulic oil from the deployment speed adjustment cylinder 14 at this time by a hydraulic device (not shown) (so-called meter-out control). At the time of storage, the operating oil may be sent to the deployment speed adjusting cylinder 14 to forcibly reduce it, and the opened frame member 2 may be closed by attracting the deployment chain 17. By adjusting the multiplication factor of the developing chain 17, the speed and distance of the developing chain 17 can be adjusted even when the stroke of the developing speed adjusting cylinder 14 is limited.

  For example, an electric hydraulic unit (not shown) may be separately prepared as a hydraulic source for the undulation cylinder 13, the deployment speed adjustment cylinder 14, and the deployment cylinder 19.

  A deployment sheave 20 is provided at the upper end of the gantry frame 10, and a wire 22 of a manual winch 21 placed on the installation surface P is hung on the deployment sheave 20. It is connected to one end of the frame member 2 at the front end. For example, when extension is performed by the weight of the chain scissors 6, the unfolding speed due to the weight of the chain scissors 6 can be adjusted also by unwinding the manual winch 21, so that it can also be used as a unfolding speed adjusting means. The manual winch 21 may be constituted by a hydraulic type or an electric type, but if it is a manual type, the manual winch 21 is advantageous in that it can be deployed by human power. If it is an electric winch, the car battery can also be used.

  Next, the operation of the scissors type expansion bridge 1 of the embodiment will be described.

  First, in the storage state shown in FIG. 2, the gantry frame 10 is fixed to the base end side in the extension direction of the base 12. The hoisting cylinder 13, the deployment speed adjusting cylinder 14, and the deployment cylinder 19 are in a contracted state. By keeping these in a reduced state, the storage state can be maintained. In addition, the locking device for maintaining an accommodation state separately may be provided. In this compactly accommodated state, it can be transported by trailers, ships, large helicopters, and the like.

  Next, a separately prepared hydraulic unit is connected to the hoisting cylinder 13, the deployment speed adjusting cylinder 14, and the deployment cylinder 19.

  Next, the hoisting cylinder 13 is gradually extended to stand the gantry frame 10 as shown in FIG. In this state, the chain scissors 6 remain reduced.

  Next, hydraulic oil is fed into the developing cylinder 19 and gradually expanded. Then, the horizontal shaft 2e extending in the width direction is forcibly slid by the arm 19a of the developing cylinder 19 and the developing chain 17 is fed out. At the same time, the wire 22 is fed out from the manual winch 21. The deployment speed is controlled by adjusting the amount of hydraulic oil discharged from the tube rod side of the deployment speed adjustment cylinder 14. Thereby, the space | interval between all the frame members 2 spreads gradually. In this way, the scissors frame 4 extends stably and gradually without spreading at once.

  Then, as shown in FIG. 5, when the support cutout 7a and the supported cutout 7b come into contact with each other and become flat, the extension stops and becomes stable. In this state, some locking means may be provided for stabilization, or a plate-like member may be placed on the upper surface of the extended floor member 8 and firmly integrated with a bolt or the like. A temporary bridge is thus formed. Thereby, the floor member 8 becomes a stable bridge girder, and ordinary cars and people can pass. For this reason, it is possible to bring the bridge to the disaster site at the time of a disaster and quickly restore the bridge.

  On the other hand, when retracting, for example, the manual winch 21 may be manually wound, or the floor member 8 may be folded together with the scissors frame 4 while forcibly reducing the deployment speed adjusting cylinder 14, and deployment and storage are easy. Removal is extremely easy. If such a manual winch 21 is used, it can be deployed and stored by human power.

  In the present embodiment, the frame member 2 is a lightweight and highly rigid structure made of an aluminum alloy, a magnesium alloy, or the like, so that it is easy to transport and secure strength.

  In the present embodiment, since the upper surface of the frame member 2 becomes flat when the scissors frame 4 is fully extended, the upper surface of the frame member 2 is the same as that of the floor slab without providing a separate floor slab member. It also serves as a plate with a role, and people and cars can pass through it. Since the scissors-type expansion bridge does not include a floor slab member, a large force is not required when standing up and storing from a horizontal state as when including a floor slab member. Further, since the floor slab member is not included, the number of parts is reduced, the structure is simplified, and the weight can be reduced.

  By arranging a plurality of scissors frames 4 toward the back side, the scissors frame 4 is formed as a bridge girder when the scissors frame 4 is extended. Therefore, the distance in the width direction can be easily earned when used as a bridge girder.

  Therefore, according to the scissors-type expansion bridge 1 according to the present embodiment, the top surface of the scissors frame 4 is flat when the scissors frame 4 is extended, so that it is easy to transport, store and deploy with a simple structure. The scissors type expansion bridge 1 which becomes a stable structure can be obtained.

  Since the scissors-type expansion bridge 1 of this embodiment is manufactured in advance in a factory or the like, it has high quality and completeness, and can be folded compactly, so that it is very easy to transport.

  In addition, it is possible to increase the options of countermeasures for difficult restoration work at the disaster site, and to improve the site suitability.

  In addition, when repairing the life of an aging bridge in a life-prolonging manner, a large-scale repair work for a main structure such as a main girder usually becomes a problem because the bridge is closed. However, if the scissors-type telescopic bridge 1 having the chain scissors 6 of the present embodiment is used, after the vehicle is restricted, at the place where the reaction force on the pier or abutment can be taken using the telescopic structure of the bridge body. By fixing and temporarily reinforcing the bridge, it is possible to relieve the burden of an aging bridge and to repair the bridge at the same time.

  In addition, the use of this embodiment for fishing ports and harbor piers is of great value. In other words, it is convenient for managers and users that it is possible to avoid damage due to pier use restrictions, typhoons, storm surges, etc., and that it can be installed only when using the bridge.

  Furthermore, when an evacuation route is secured due to a fire in a mid-to-low-rise building, if the present embodiment is provided so that an evacuation bridge can be built up to an adjacent building, the effect is great in an emergency.

-Modification 1-
FIG. 8 is a front view illustrating an outline of a development example of the scissor-type telescopic bridge 101 according to the first modification of the embodiment by the suspension bridge 130. In the following modifications, the same parts as those in FIGS. 1 to 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this modification, for example, one end side of the chain scissors 6 is fixed to one suspension bridge 130, the wire 122 is hung on the deployment sheave 120 provided at the other end, and the distal end side is deployed to the deployment sheave of the other suspension bridge 130. If the chain scissors 6 are extended by hanging on 120 and the tip is pulled by a crane or winch, and the other end is fixed to the other suspension bridge 130, the scissors-type expansion bridge 101 is temporarily installed.

  Note that the wire 22 may be pulled directly by a crane or the like without the wire 122 being hung on the unfolding sheave 120 of the other suspension bridge 130.

  With this configuration, there is no need for temporary assembly of the main body or a temporary yard for the length of the bridge, which has been a problem in the field so far. It is possible to build the main body of the bridge in a short time.

-Modification 2-
FIG. 9: shows the outline of the expansion example of the scissors-type expansion-bridge 201 by the pontoon 230 which concerns on the modification 2 of embodiment, (a) is a front view at the time of accommodation, (b) is a front view at the time of maximum expansion | extension It is.

  The lower end side of the scissors frame 4 is supported by a plurality of pontoons 230 (a flat bottom boat, also called a flat bottom boat or a pier boat), and the chain scissors 6 are extended by increasing the distance between adjacent pontoons 230 during extension. The

  In this modified example, as shown in FIG. 9A, the pontoon 230 is connected and towed on the water surface 231 with a tugboat or the like, and the lower end of the chain scissors 6 is supported on the pontoon 230 on the site. If the floor member 8 is connected horizontally with the distance extended, a temporary bridge can be easily installed on the water surface 231 as shown in FIG. At this time, no pier is required.

  In this way, it is possible to easily construct a bridge system in a river or a port by linking a plurality of pontoons 230 with the chain scissors 6. By integrating several pontoons 230 in a compact manner, it is possible to easily construct a large ship bridge system. With this system, it is possible to secure an evacuation route in a large-scale flood.

  As an application of this modified example, when “passing” is necessary for the purpose of berthing from the ship (particularly assuming that the harbor facilities are also severely damaged), the compact chain scissors 6 are equipped on the ship. As a result, a flexible operation is possible, and it is possible to cross over safely when moving from one ship to another.

-Modification 3-
FIG. 10 is a front view illustrating a state in which the scissors-type expansion bridge 1 is provided on the loading platform 331 of the trailer 330 according to the third modification of the embodiment.

  In this modification, the base 12 including the gantry frame 10 is placed on the loading platform 331 of the trailer 330. The loading platform 331 is transported to the site by a trailer 330, the scissors-type expansion bridge 1 is lowered at the site, and the chain scissors 6 are extended.

  Specifically, the scissors-type telescopic bridge 1 in the stowed state is loaded and transported on the loading platform 331 of the trailer 330, and the outrigger 332 is extended and lifted at the site, and then the trailer 330 is advanced, whereby the scissors-type telescopic bridge 1 can be placed on the ground or the like.

  After placement, the chain scissors 6 may be extended with the outrigger 332 extended, or the outrigger 332 may be contracted and deployed. As described above, the temporary bridge or the like can be provided extremely quickly and easily by deploying the loading platform on the ground or the like using the outrigger 332 on the site.

  On the other hand, when the chain scissors 6 are reduced, the carriage 331 of the trailer 330 is inserted thereunder after the chain scissors 6 are reduced, and the outrigger 332 is contracted so that it is placed on the carriage 331 without being lifted by a crane. Can be withdrawn.

  In this modification, by using the outrigger 332, the scissors type expansion bridge 1 can be loaded and unloaded very easily without preparing a special machine such as a crane.

-Modification 4-
Although not shown in detail, the scissors-type expansion bridge 1 that can be deployed independently in a cantilever state is projected from both banks and supported by a vent or the like in the center, and both chained scissors 6 are joined at the center, and support such as a vent is then supported. By removing, the desired bridge can be quickly constructed.

-Modification 5-
Although not shown in detail, the scissors-type expansion bridge 1 is deployed in a state where both ends of a predetermined span are extended from a plurality of columns of vents, the chained scissors 6 from both directions are joined, and the support of the vent is removed, thereby being desired. You can build a bridge quickly.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above-described embodiment, the deployment speed adjusting cylinder 14 using the deployment chain 17 has been described as the deployment assisting device 23. However, particularly in the case of the small scissors-type expansion bridge 1, the deployment chain 17 and the deployment speed. Deployment and storage can be performed only by the manual winch 21 without providing the adjustment cylinder 14.

  Further, if a wheel is provided on the horizontal shaft 2e on the distal end side in the extension direction, the chain scissors 6 may be smoothly deployed.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

  As described above, the present invention is useful for scissors-type stretchable structures such as scissors-type stretchable bridges.

1 Scissors-type expansion bridge (scissors-type expansion structure)
2 Frame members
2a Center pin insertion hole
2b Through hole
2c Center axis
2d Tip pin insertion hole
2e Horizontal axis
3 Frame elements
4 Scissors frame
5a Hinge part
6 Chain Scissors
7 Scissors body
8 Floor material
10 Mounting frame
11 Guide members
11a Roller
12 base
12a Rotating shaft
13 Undulating cylinder
14 Cylinder for deployment speed adjustment
15 First sprocket
16 Second sprocket
17 Chain for deployment
18 Fixed part
19 Cylinder for deployment
19a arm
20 Sheave for deployment
21 Manual winch
22 wires
23 Deployment Auxiliary Device 101 Scissors-type telescopic bridge (scissors-type telescopic structure)
120 Sheaves for deployment 122 Wire 130 Bridge 201 Scissors-type expansion bridge (scissors-type expansion structure)
230 Pontoon 231 Water surface 330 Trailer 331 Loading platform 332 Outrigger

Claims (6)

It is a scissors-type elastic structure that can expand and contract in the extension direction,
A plurality of frame elements including two frame members that are pin-coupled to each other at the central portion have a scissor frame that is pin-coupled to each other at the tip of the frame member;
When the scissor frame is extended, the frame members on the front side of the frame element are linearly connected to each other, and the frame members on the back side are linearly connected to each other, whereby the frame member A scissors-type elastic structure characterized in that a flat surface having a continuous upper surface is formed. In the scissors type elastic structure according to claim 1,
A scissors-type telescopic structure, wherein a plurality of scissors frames are arranged toward the back side to form bridge girders when the scissors frame is extended. In the scissors type elastic structure according to claim 1 or 2,
A scissors-type telescopic structure characterized in that the frame member includes a scissors body having a central pin insertion hole provided in a central portion, and a floor member provided above the scissors body and forming the flat surface. . In the scissors type expansion-contraction structure as described in any one of Claims 1 thru | or 3,
The scissors frame at the time of expansion is a scissors-type stretchable structure characterized in that the positions where the frame members are connected to each other are shifted between the front side and the back side in plan view. In the scissors type expansion-contraction structure as described in any one of Claims 1 thru | or 4,
A scissors-type telescopic structure, wherein a lower end side of the scissors frame is supported by a plurality of pontoons and is expanded by increasing a distance between adjacent pontoons during expansion. In the scissors type expansion-contraction structure as described in any one of Claims 1 thru | or 4,
A scissors-type telescopic structure characterized by comprising an outrigger that can be placed on a trailer bed and that extends up and down outside the bed to support its own weight.

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