Mobile platform

Abstract

To solve the problems of the prior art, that is, to provide a mobile platform capable of expanding a running path and easily changing a section to be expanded.SOLUTION: A mobile platform of the present invention comprises a central floor, a tunnel entrance ramp, a tunnel face ramp, a central tire, and an outrigger. Of these, the central floor is positioned substantially horizontally at a position higher than the roadbed height of a running track inside a tunnel. The tunnel entrance ramp is positioned closer to a tunnel entrance than the central floor, and connects the running track and the central floor. The tunnel face ramp is positioned closer to the tunnel face than the central floor, and connects the central floor and the running track. When the central floor is lowered by the outrigger, the central tire comes into contact with the running track, enabling the tunnel to run in the tunnel axial direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to technology relating to a roadway for construction machinery to travel within a tunnel, and more specifically, to a mobile platform with a floor that is wider than the roadbed surface of the tunnel. [Background technology]

[0002] It is said that roughly two-thirds of Japan's land area is mountainous, and as a result, roads and railway tracks (hereafter referred to as "roads, etc.") almost always have sections that pass through mountainous areas. To build roads, etc. in mountainous areas, it is common to employ either the cut earth method, which excavates part of the slope, or the tunnel method, which hollows out the interior of the natural ground. While the tunnel method tends to have a higher construction cost (construction cost per length of road, etc.) than the cut earth method, it also tends to require less excavated soil (i.e., the amount of soil discharged), and has the advantage of allowing greater freedom in the linear planning of roads, etc. (for example, shortcuts can be taken), and it is said that more than 10,000 tunnels have been constructed in Japan to date.

[0003] Until the 1970s, the main method of construction for mountain tunnels was the "sheet pile method," which combined steel arch supports with wooden sheet piles to support the natural ground, but now the New Austrian Tunneling Method (NATM), which actively utilizes the strength of the natural ground, has become mainstream. NATM's main feature is its design philosophy that relies on the strength of the natural ground (arch effect), which makes it possible to reduce the scale of the tunnel supports compared to the conventional sheet pile method, and also to increase the speed of construction, thereby reducing construction costs.

[0004] Here, we will briefly explain the excavation procedure using NATM. First, the tunnel face is excavated. In the case of blasting excavation, a drill jumbo is used to drill a hole and load explosives (dynamite), and the workers and the drill jumbo evacuate before blasting. On the other hand, in the case of mechanical excavation, the tunnel face is cut by a free-section excavator. The excavation length (1 span length) of one cycle varies depending on the support pattern set according to the strength of the ground, but generally, excavation is performed with a span length of 1.0 to 2.0 m. After one span length is excavated, the unstable ground parts (loose stones, etc.) are brushed off, and the debris is removed (debris removal) by a dump truck (or belt conveyor method). After the debris removal, mirror spraying or primary concrete spraying is performed, and then steel supports are erected as necessary (depending on the support pattern), secondary concrete spraying is performed, and then rock bolts are installed. The primary concrete spraying work, secondary concrete spraying work, and rock bolting work will be carried out on the inner surface of the tunnel (the surface from the side wall to the top) for the length of the excavated span.

[0005] In this way, NATM is a construction method in which excavation is carried out one span (1.0 to 2.0 m) at a time by repeatedly performing a series of processes, such as rock drilling (for example, drilling holes at the face and blasting), debris removal, erecting steel supports, spraying concrete, and driving rock bolts. Different machines are positioned near the face for each process. For example, a side dump is positioned for the debris removal process, a concrete sprayer is positioned for the steel supports erection process and the concrete spraying process, and a drill jumbo and a mortar injection pump truck are positioned for the rock bolt driving process.

[0006] The fact that different machines are stationed near the tunnel face for each process means that construction machines are replaced for each process, and so construction machines move back and forth inside the tunnel when processes are switched. Among the construction machines, drill jumbos often wait a short distance away from the face, but other construction machines generally leave the tunnel.

[0007] As mentioned above, tunnel excavation is carried out by repeating the excavation process and rock bolt installation process, meaning that tunnel excavation proceeds with shotcrete and rock bolts as support, but ultimately a lining concrete is constructed for the purpose of service functions such as "waterproofing," "fireproofing," "interior work," and "facility maintenance," as well as mechanical functions such as "additional external force support" and "complementing support." This lining concrete is usually installed when the tunnel excavation has progressed to a certain extent, so for a certain period of time, tunnel face work and secondary lining work are carried out in parallel.

[0008] When constructing the lining concrete, concrete pump vehicles and agitator vehicles are placed near the construction position where the center (mobile formwork) is set. Therefore, when switching processes, the construction machinery placed at the face in the previous process and the construction machinery required for the next process will pass through the section where the concrete pump vehicles are placed. In a tunnel with a relatively large cross-section, a wide width can be secured as a running path for construction machinery, so construction machinery can easily pass beside concrete pump vehicles. In contrast, in a narrow cross-section tunnel, the width of the running path is narrow, and it may be difficult for construction machinery to pass beside concrete pump vehicles. In particular, in narrow cross-section tunnels, the shear removal is often performed by a belt conveyor system to avoid the traffic of dump trucks, so the belt conveyor occupies part of the tunnel cross-section, and furthermore, the air pipe for sending fresh air to the face also occupies part of it, making it even more difficult to secure the width of the running path.

[0009] Generally, the inner shape of a tunnel is horseshoe-shaped or circular, and the width (horizontal distance) becomes smaller as it moves away from the so-called spring line. For example, in FIG. 9(a), the running path is formed at a position lower than the spring line, so the width is narrower accordingly. In cases where only a width that does not allow construction machines to pass each other at the same place can be secured, embankment was sometimes built in part of the tunnel as shown in FIG. 9(b). The position of the running path is moved closer to the spring line by the embankment, and the width of the running path is expanded. It is not so uncommon to build an embankment in a tunnel, and it has been done for purposes other than expanding the width of the running path. For example, Patent Document 1 proposes a temporary passage made of lightweight embankment material that also serves as a curing material for invert concrete. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2018-25082 A Summary of the Invention [Problem to be solved by the invention]

[0011] Embankments for construction machines to move apart, as shown in Figure 9(b), are placed at regular intervals (for example, 300 to 500 m) in the direction of the tunnel extension, and of course are left in that state permanently for as long as necessary. Therefore, although it is necessary to build embankments every time tunnel excavation progresses to a certain extent, once the embankments are built, no special work is required thereafter, and there is no major disruption to face work or secondary lining work.

[0012] On the other hand, in cases where the width of the travelway is so narrow that it is difficult for construction machinery to pass beside a concrete pump truck, widening the width by embankment is not practical. The construction of the lining concrete is carried out one span at a time (usually 10.5 m) as it proceeds toward the face. Therefore, the centering truck frequently moves toward the face, and the location of the concrete pump truck also changes frequently. In other words, if embankment is built on the side of the concrete pump truck to widen the width of the travelway, the embankment will have to be moved every time the centering truck moves, and the embankment will have to be removed and rebuilt frequently. During this embankment work, construction machinery cannot pass through that section, which essentially means that face work is stopped, so this is not a practical method.

[0013] The object of the present invention is to solve the problems associated with the prior art, i.e., to provide a mobile platform that allows the travel path to be extended and the section to be extended to be easily changed. [Means for solving the problem]

[0014] The present invention was made with a focus on placing the central floor higher than the roadbed inside the tunnel and using tires for movement, and is an invention based on an entirely new idea.

[0015] The mobile platform of the present invention comprises a central floor, a tunnel entrance ramp, a tunnel face ramp, a central tire, and outriggers. The central floor is located at a position higher than the roadbed height of the running track in the tunnel and is arranged approximately horizontally (including horizontal), the tunnel entrance ramp is located closer to the tunnel entrance than the central floor and connects the running track and the central floor, and the tunnel face ramp is located closer to the tunnel face than the central floor and connects the central floor and the running track. The central tire is attached to the central floor, and the outriggers raise and lower the central floor. When the central floor is lowered by the outriggers, the central tire touches the running track and becomes able to run in the tunnel axial direction. The length of the central floor in the tunnel crossing direction is longer than the length of the running track located below the central floor in the tunnel crossing direction.

[0016] The mobile platform of the present invention may have a central floor consisting of a running floor and a working floor. The running floor and the working floor are arranged side by side in the tunnel crossing direction. The length of the working floor in the tunnel axial direction is longer than the length of the running floor in the tunnel axial direction. The running floor is connected to a portal ramp and a face ramp, and only one of the portal ramp and the face ramp is connected to one of the running floors. In this case, a work vehicle arranged on the working floor can perform work while another work vehicle travels on the running floor.

[0017] The mobile platform of the present invention may further include a rotation mechanism for rotating the portal ramp hinged to the central floor and for rotating the tunnel face ramp hinged to the central floor. In this case, the mobile platform of the present invention travels in the tunnel axis direction with the portal ramp and the tunnel face ramp raised by the rotation mechanism.

[0018] The mobile platform of the present invention may further include a tunnel entrance tire attached to the tunnel entrance ramp and a tunnel face tire attached to the tunnel face ramp. In this case, the mobile platform of the present invention travels in the tunnel axial direction by the center tire, the tunnel entrance tire, and the tunnel face tire that are in contact with the running track.

[0019] The mobile platform of the present invention may further comprise fasteners attached to the entrance ramp and the face ramp, respectively. In this case, the mobile platform of the present invention travels in the tunnel axial direction by pulling the material attached to the fasteners by another machine.

[0020] The mobile platform of the present invention may further include a drive unit for rotating the central tire. In this case, the mobile platform of the present invention moves autonomously in the tunnel axis direction. Effect of the Invention

[0021] The mobile stand of the present invention has the following advantages. (1) Even in tunnels with narrow travel paths, such as narrow cross-section tunnels, a travel path wide enough for construction machinery to pass and pass each other can be ensured. (2) Since the vehicle can move using tires, there is no need to lay rails, and the running path can be set up flexibly to accommodate changes in the construction position of the covering concrete. (3) The tunnel runway can be installed easily and in a short time, without significantly affecting other operations, including face work. As a result, tunnel excavation can be carried out more smoothly than before. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is a side view showing a schematic diagram of the mobile platform of the present invention in use. [Diagram 2] FIG. 2 is a cross-sectional view of a tunnel, which is a schematic diagram of the mobile platform of the present invention when in use. [Diagram 3] A cross-sectional view of a tunnel showing a mobile platform whose center is positioned to the right of the center of the tunnel. [Figure 4] FIG. 2 is a side view showing the mobile stand of the present invention during movement. [Diagram 5] FIG. 4 is a side view showing a schematic diagram of the mobile platform that is moved by being towed by another construction machine. [Figure 6] FIG. 2 is a plan view showing the central floor consisting of a running floor and a working floor. [Figure 7] A cross-sectional view of a tunnel showing a schematic diagram of the central deck consisting of a running deck and a working deck. [Figure 8] FIG. 1A is a side view showing a schematic diagram of a dump truck traveling on a running platform, and FIG. 1B is a side view showing a schematic diagram of an agitator truck and a concrete pump truck arranged on a working platform. [Figure 9] (a) is a cross-sectional view showing a schematic of a runway formed at a position lower than the spring line, and (b) is a cross-sectional view showing a schematic of a runway whose width has been expanded by embankment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] An example of the mobile stand of the present invention will be described with reference to the drawings.

[0024] Fig. 1 is a side view showing a schematic diagram of a mobile platform 100 according to the present invention. For convenience, the longitudinal direction (longitudinal direction) of the tunnel as shown in Fig. 1 is referred to as the "tunnel axis direction", and the horizontal direction perpendicular to the tunnel axis direction is referred to as the "tunnel cross direction". As shown in this figure, the mobile platform 100 according to the present invention is configured to include a central floor 110, a mine entrance ramp 120, a face ramp 130, a central tire 140, and an outrigger 150, and may further include a rotation mechanism, mine entrance tires, face tires, locking devices, a drive unit, and the like, which will be described later.

[0025] One of the technical features of the mobile platform 100 of the present invention is that it has a "running path" located at a position higher than the height of the roadbed surface (roadbed height) inside the tunnel. Here, the "running path" is a passageway, so to speak, for the "work vehicles" that move inside the tunnel, such as side dumps, concrete sprayers, mortar injection pump vehicles, agitator vehicles, and dump trucks. In order to distinguish between the running path secured by the mobile platform 100 and the running path on the roadbed of the tunnel, for the sake of convenience, the former will be referred to as the "platform running path" and the latter as the "road surface running path."

[0026] As mentioned above, the closer one gets to the spring line, the larger the tunnel width (the length in the direction across the tunnel). Therefore, as shown in Fig. 2, the width of the platform runway due to the central floor 110 located at a position higher than the roadbed height is larger than the width of the road surface runway located below it. In other words, by installing the mobile platform 100, the runway width is wider in the installation section than in other sections, in other words, the space of the tunnel TN can be used more effectively.

[0027] The central floor 110 constituting the mobile platform 100 is a member arranged approximately parallel (for example, horizontally) to the roadbed surface inside the tunnel TN as shown in FIG. 1, and forms a flat surface on its upper surface. For example, the mobile platform 100 can be structured to have a framework structure combining shaped steel such as H-shaped steel and channel steel, and a covering plate placed on its upper surface. The flat surface (upper surface) of the mobile platform 100 is made to have a width dimension larger than the width dimension of the road surface running path located below it. As a result, when the mobile platform 100 is installed in a predetermined position (hereinafter simply referred to as "when in use"), the platform running path formed by the central floor 110 is wider than the road surface running path.

[0028] The entrance ramp 120 constituting the mobile platform 100 is disposed closer to the entrance than the central floor 110, and is a ramp that connects the central floor 110 to the road surface running path. On the other hand, the face ramp 130 is disposed closer to the face than the central floor 110, and is a ramp that connects the central floor 110 to the road surface running path. As a result, a series of platform running paths are formed by the entrance ramp 120, the central floor 110, and the face ramp 130. For example, a work vehicle heading from the entrance to the face goes up the entrance ramp 120, travels on the central floor 110, and then goes down the face ramp 130, while a work vehicle heading from the face to the entrance goes up the face ramp 130, travels on the central floor 110, and then goes down the entrance ramp 120.

[0029] The entrance ramp 120 and the face ramp 130, like the central floor 110, each have a flat surface on the upper surface, and can be a structure consisting of a frame structure made of steel beams and a steel plate placed on the upper surface. The entrance ramp 120 and the face ramp 130 connect the central floor 110 and the road surface running path, so the layout height gradually changes, and the tunnel width at the layout height of the central floor 110 is different from the tunnel width at the road surface running path. Therefore, the flat surface (upper surface) of the entrance ramp 120 and the face ramp 130 should be equal to the width dimension of the road surface running path, or should be tapered so that the width dimension of the central floor 110 changes to the width dimension of the road surface running path.

[0030] In addition, the entrance ramp 120 is hinged to the central floor 110 at its end on the face side, and similarly, the face ramp 130 is hinged to the central floor 110 at its end on the face side. This allows the entrance ramp 120 and the face ramp 130 to rotate in a substantially vertical plane (including the vertical plane) as shown by the rotation arrow in FIG. 1. As described later, the placement height of the central floor 110 is raised and lowered by the outrigger 150, and the slope of the entrance ramp 120 and the face ramp 130 also changes accordingly, but since each end is hinged, the slope can be flexibly changed. Note that the mobile platform 100 may be provided with a "rotation mechanism" that utilizes hydraulic or electric power, and the entrance ramp 120 and the face ramp 130 may be configured to be rotated, so to speak, by this rotation mechanism.

[0031] When in use, the mobile platform 100 can be positioned so that its center roughly coincides with the center of the tunnel, as shown in Fig. 2. This allows the width of the tunnel at the height of the central floor 110 to be used to the fullest. On the other hand, in cases where an air pipe WP and a belt conveyor BC are arranged inside the tunnel TN, as shown in Fig. 3, it may be difficult to arrange the centers so that they coincide, as in Fig. 2. In this case, it is advisable to position the mobile platform 100 so that its center is shifted to one side from the center of the tunnel. However, even in this case, it is desirable that the flat surface of the mobile platform 100 has a width dimension larger than the width dimension of the road surface running path.

[0032] FIG. 4 is a tunnel cross-sectional view that shows a schematic diagram of the mobile platform 100 when moving (hereinafter, simply referred to as "during movement"). As shown in this figure, a central tire 140 is provided below the central floor 110, and the mobile platform 100 can move in the tunnel axial direction by using this central tire 140. In addition to the central tire 140, a wellhead tire 160 can be provided below the entrance ramp 120, and a face tire 170 can be provided below the face ramp 130. If the wellhead tire 160 or the face tire 170 is not provided, the mobile platform 100 moves with the entrance ramp 120 and the face ramp 130 in contact with the ground, that is, by dragging the entrance ramp 120 and the face ramp 130.

[0033] In Fig. 4, three center tires 140 are arranged in the tunnel axial direction, but this is not limiting, and two center tires 140 or four or more center tires 140 may be arranged. If the multiple center tires 140 arranged in the tunnel axial direction are considered to be one row of center tires 140, two or more rows of center tires 140 may be arranged in the tunnel transverse direction. Similarly, the wellhead tires 160 and the face tires 170 may each be formed into one row of one or two or more wellhead tires 160 and face tires 170, and one or two or more rows of wellhead tires 160 and face tires 170 may be arranged in the tunnel transverse direction.

[0034] A "driving device" such as an engine or a motor can be used to move the mobile platform 100. The driving device constituting the mobile platform 100 rotates the central tire 140, causing the mobile platform 100 to move on its own. When the mobile platform 100 is equipped with a driving device, only the central tire 140 can be used as a driving wheel, or in addition to the central tire 140, the wellhead tire 160 and the face tire 170 can also function as driving wheels.

[0035] The mobile platform 100 can also be configured to be moved by being pulled by another construction machine MC (a backhoe in the figure) as shown in FIG. 5. Specifically, one end of a work material WR such as a wire rope is connected to a part of the mobile platform 100, and the other end is connected to the construction machine MC, and the construction machine MC moves the mobile platform 100 by pulling the work material WR. In this case, a locking device 180 for connecting one end of the work material WR may be provided on the entrance ramp 120 and the face ramp 130. This locking device 180 is, for example, a hook-shaped or ring-shaped member that can lock a U-bolt or the like connected to the work material WR. For convenience, the locking device 180 is drawn in FIG. 4 so as to protrude from the upper surface of the entrance ramp 120 and the face ramp 130, but since it becomes an obstacle for the travel of a work vehicle, it is preferable to install the locking device 180 so that it is housed inside the entrance ramp 120 and the face ramp 130 after providing an opening and closing cover. As the towing means, a winding device such as a winch or hoist can be used in addition to the construction machine MC. Also, by towing the material WR via a pulley, the mobile platform 100 can be moved in the opposite direction to the towing direction. For example, when the material WR connected to a part of the platform 100 is turned by a pulley on the face side and its tip is towed to the mine mouth side, the mobile platform 100 moves to the face side.

[0036] In Fig. 5, the mobile platform 100 is being towed by a construction machine MC located away from the mobile platform 100 (away from the tunnel face in this figure), so the mobile platform 100 receives a force generally in the tunnel axial direction. Therefore, the mobile platform 100 moves with the tunnel face tires 170 on the ground, in other words, with the tunnel face tires 170 functioning as tires. On the other hand, the construction machine MC approaching the mobile platform 100 may also tow the mobile platform 100. In this case, the construction machine MC will tow the mobile platform 100 while lifting the tunnel face ramp 120 (or tunnel face ramp 130), and the mobile platform 100 will move with the tunnel face tires 160 (or tunnel face tires 170) off the road surface. In other words, in cases where the mobile platform 100 is equipped with wellhead tires 160 and / or face tires 170, the construction machine MC tows the mobile platform 100 at a position away from the mobile platform 100, and in cases where the mobile platform 100 is not equipped with wellhead tires 160 and / or face tires 170, or where there is a malfunction in the wellhead tires 160 and / or face tires 170, the construction machine MC tows the mobile platform 100 at a position close to the mobile platform 100.

[0037] In addition, when the mobile platform 100 is equipped with the above-mentioned "rotation mechanism," it is preferable to rotate the mine entrance ramp 120 and the face ramp 130 by the rotation mechanism before moving. Specifically, the mine entrance ramp 120 and the face ramp 130 are rotated so as to rise, in other words, to move away from the road surface, and the mobile platform 100 moves in a state in which the mine entrance ramp 120 and the face ramp 130 are, so to speak, cantilevers. This allows the mobile platform 100 to move without the mine entrance ramp 120 and the face ramp 130 (or the mine entrance tires 160 and the face tires 170) touching the ground, that is, without the action of frictional force. This is particularly effective in cases where the mine entrance tires 160 and the face tires 170 are not equipped.

[0038] The outriggers 150 constituting the mobile platform 100 support the central floor 110 and raise and lower the central floor 110. The mobile platform 100 of the present invention can be used, for example, for lining concrete work. In this case, the mobile platform 100 is set while repeatedly moving along with the movement of the center. That is, when one span of lining concrete is poured and cured, the center moves one span toward the face side, and the mobile platform 100 moves toward the face side and is set in the state when in use. Since a work vehicle runs on the top surface of the central floor 110 during use, it is desirable to firmly support the central floor 110 with the outriggers 150. At this time, the mobile platform 100 has moved and the central tire 140 is in a state of being in contact with the ground, so the central floor 110 is raised by the outriggers 150. In order to move the mobile platform 100 to a mobile state, at least the central tire 140 must be grounded, and therefore the central floor 110 must be lowered by the outriggers 150.

[0039] Incidentally, when the mobile platform 100 is equipped with the mine entrance tire 160 and the face tire 170, depending on the shape of the mine entrance ramp 120 and the face ramp 130, the mine entrance tire 160 and the face tire 170 may remain in a grounded state even if the central floor 110 is raised to a predetermined height, and the mine entrance ramp 120 and the face ramp 130 may not be connected to the road surface running path. In this case, it is preferable to use a jack or the like to configure the mine entrance tire 160 and the face tire 170 to rise and fall. When the mine entrance tire 160 and the face tire 170 are grounded, the mine entrance tire 160 and the face tire 170 are lowered by a jack or the like, while when the mine entrance ramp 120 and the face ramp 130 are connected to the road surface running path, the mine entrance tire 160 and the face tire 170 are raised by a jack or the like to be accommodated inside the mine entrance ramp 120 and the face ramp 130.

[0040] The central floor 110 can also be configured to include a traveling floor 111 and a working floor 112, as shown in Fig. 6 and Fig. 7. Fig. 6 is a plan view showing the central floor 110 consisting of the traveling floor 111 and the working floor 112, and Fig. 7 is a tunnel cross-sectional view showing the central floor 110 consisting of the traveling floor 111 and the working floor 112. As shown in these figures, the traveling floor 111 and the working floor 112 are arranged side by side in the tunnel cross direction. Also, as shown in Fig. 6, the central floor 110 is formed so that the length of the working floor 112 in the tunnel axial direction is longer than the length of the working floor 112 in the tunnel axial direction.

[0041] The travelling floor 111 is used as a travel path (i.e., a platform travel path) for work vehicles traveling inside the tunnel TN, while the work floor 112 is used to position work vehicles used for, for example, lining concrete work. For this reason, the travelling floor 111 is connected to the tunnel entrance ramp 120 on its tunnel entrance side, and to the face ramp 130 on its face side. This means that even when a work vehicle positioned on the work floor 112 is performing a specific task, other work vehicles (dump truck DT in the figure) can pass beside it, as shown in Fig. 8(a).

[0042] The working platform 112 is not a space for work vehicles to pass through, but a space for work vehicles to be placed to perform a specific task. In other words, a work vehicle can enter the working platform 112 from one direction and exit from the same direction. Therefore, it is sufficient to connect only one of the entrance ramp 120 and the face ramp 130 to the working platform 112. For example, the working platform 112 shown in Figure 6 is connected only to the face ramp 130.

[0043] The working floor 112 can also be divided into a first working floor 112F and a second working floor 112M. More specifically, as shown in FIG. 6, the working floor 112 is divided in the tunnel axis direction, and one of them (the tunnel mouth side in the figure) is the first working floor 112F, and the other (the face side in the figure) is the second working floor 112M. For example, in FIG. 8(b), the tunnel mouth side of the working floor 112 is the first working floor 112F, and the face side is the second working floor 112M, and the face ramp 130 is connected to the face side of the second working floor 112M. A concrete pump vehicle CP is arranged on the first working floor 112F, and an agitator vehicle AG is arranged on the second working floor 112M. Since the concrete pump vehicle CP does not move during the lining concrete work, it is placed on the first work platform 112F, away from the face ramp 130, while the agitator vehicle AG, which frequently enters and exits, is placed on the second work platform 112M, closer to the face ramp 130.

[0044] An example of a procedure for lining concrete using the mobile platform 100 of the present invention will be described below with reference to Fig. 8. First, the mobile platform 100 is moved to a specified position, and the central floor 110 is raised and firmly supported by the outriggers 150. At this time, if the wellhead tires 160 and the face tires 170 are still in a grounded state and the wellhead ramp 120 and the face ramp 130 are not connected to the road surface running track, the wellhead tires 160 and the face tires 170 are raised using a jack or the like and stored inside the wellhead ramp 120 and the face ramp 130.

[0045] When the mobile platform 100 is set to the state when in use, a work vehicle such as a dump truck DT starts to pass through the platform runway consisting of the mine entrance ramp 120, the runway floor 111, and the face ramp 130. The concrete pump vehicle CP passes through the mine entrance ramp 120 and proceeds to the face side, and then turns around using a turntable or the like, and then travels toward the mine entrance side. The concrete pump vehicle CP that has moved to the mobile platform 100 then enters from the face ramp 130, passes through the second work floor 112M, and is set on the first work floor 112F. Similarly to the concrete pump vehicle CP, the agitator vehicle AG passes through the mine entrance ramp 120 and proceeds to the face side, turns around using a turntable or the like, and then heads toward the mine entrance side, and then enters from the face ramp 130 and is set on the second work floor 112M. When the concrete pump truck CP has run out of concrete to load, it exits the face ramp 130 and proceeds toward the face, then turns around using a turntable or the like before heading toward the mine entrance, passing over the running platform 111 and returning to the concrete plant. [Industrial Applicability]

[0046] The mobile platform of the present invention can be used for excavating tunnels for various purposes, such as road tunnels, railway tunnels, water tunnels, etc. Considering that the present invention can efficiently and safely construct social infrastructure such as tunnel structures, it can be said to be an invention that can be expected to not only be used industrially but also to make a great contribution to society. [Explanation of symbols]

[0047] 100 Mobile stand of the present invention 110 (Mobile platform) center floor 111 (Central Floor) Running Floor 112 (Central Floor) Working Floor 112F (Work Floor) 1st Work Floor 112M (Work Platform) No. 2 Work Platform 120 (Mobile platform) Minehead ramp 130 (Mobile platform) Face ramp 140 (Mobile stand) central tire 150 (Mobile platform) outrigger 160 (Mobile platform) wellhead tires 170 (Mobile platform) Face tire 180 (Mobile stand) fastener AG Agitator Vehicle BC Belt Conveyor CP concrete pump truck DT Dump Truck MC construction machinery TN Tunnel WP windpipe WR strategy material

Claims

1. A central floor that is positioned higher than the roadbed height of the running road in the tunnel and is horizontal or approximately horizontal; A mine entrance ramp that is disposed on the mine entrance side of the central floor and connects the runway and the central floor; A face ramp is disposed on the face side of the central floor and connects the central floor and the travel path; a center tire attached to the center floor; and an outrigger for raising and lowering the central floor, When the central floor is lowered by the outriggers, the central tire comes into contact with the running path and becomes capable of running in the tunnel axial direction. The length of the central floor in the tunnel crossing direction is longer than the length of the running path located below the central floor in the tunnel crossing direction. A mobile stand characterized by:

2. The central floor comprises a running floor and a working floor arranged side by side in the tunnel crossing direction, The length of the working bed in the tunnel axial direction is longer than the length of the traveling bed in the tunnel axial direction, The running bed is connected to the entrance ramp and the face ramp, Only one of the entrance ramp and the face ramp is connected to the running bed, While a work vehicle arranged on the work platform is performing work, another work vehicle can travel on the travel platform.

2. The mobile stand according to claim 1.

3. A rotation mechanism for rotating the entrance ramp hinged to the central floor and rotating the face ramp hinged to the central floor, The entrance ramp and the face ramp are lifted by the rotation mechanism and run in the tunnel axis direction.

2. The mobile stand according to claim 1.

4. A wellhead tire attached to the wellhead ramp; A face tire attached to the face ramp, The central tire, the portal tire, and the face tire contact the running road, and run in the tunnel axial direction.

2. The mobile stand according to claim 1.

5. Further provided is a locking device attached to each of the entrance ramp and the face ramp, The material attached to the fastening tool is pulled by another machine to travel in the tunnel axial direction.

2. The mobile stand according to claim 1.

6. a drive device for rotating the central tire; Self-propelled along the tunnel axis, 2. The mobile stand according to claim 1.

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