cargo bed

Abstract

To enable sediment loading work and unloading work to be efficiently executed when sediment is transported in a steel pipe.SOLUTION: A load deck C is placed on a sediment transporting vehicle SV traveling between a pit mouth side and a working face side of a steel pipe 1 that has a rectangular cross section and is pressed into a natural ground in order to form a box-shaped roof by a non-open-cut jacking method. The load deck is formed of a quadrangle bottom plate 40 and lateral plates 41 to 44 erected so as to surround the bottom plate 40. A cutout part 44a opening on upper side is formed on the lateral plate 44 on the working face side. A suspender 45 is fitted to one position in a center in a width direction of the lateral plate 43 on the pit mouth side and the lateral plate 44 on the working face side, respectively, and the load deck is placed on the sediment transporting vehicle. The suspender 45 of the lateral plate 43 on the pit mouth side is fitted to a position at or above half height of the load deck C. The suspender 45 of the lateral plate 44 on the working face side is fitted to a position under the cutout part 44a and lower than the half height of the load deck C.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] The present invention relates to Loading platform on a soil transport vehicle .

Background Art

[0002] A non-cutting propulsion construction method is known as a construction method for installing a box body (tunnel main body), which is the main structure, in the natural ground under in-service facilities such as railways and roads without open-cutting. Since the non-cutting propulsion construction method is a technology for forming a tunnel directly below ground facilities while the facilities are still in use, it is used when the gap between the ground surface and the top surface of the tunnel is narrow and methods such as the shield construction method cannot be applied.

[0003] Among the technologies classified into the non-cutting propulsion construction method, there are, for example, the R&C method (Roof & Culverts Method) and the SFT method (Simple and Face-Less Method of Construction of Tunnel). Both methods are construction methods in which a plurality of steel pipes with rectangular cross-sections are installed adjacently along the outer periphery of the planned box installation area from the starting side to the reaching side of the natural ground to form a box-shaped roof (pipe roof), and then the box body is advanced while pushing the box-shaped roof out of the natural ground, so as to install the box body in the planned box installation area.

[0004] In non-cutting propulsion construction, rational and efficient construction of box-shaped roof propulsion that greatly affects the construction period and cost is required. Therefore, when driving a plurality of steel pipes into the natural ground to construct the box-shaped roof, it is important to efficiently and at low cost carry out in-pit conveyance, in which the earth and sand generated by excavating the face, which is the closed end of the steel pipe, is conveyed to the pit opening, which is the open end of the steel pipe, and discharged to the outside. In the in-pit conveyance of earth and sand, operations are performed such as attaching a wire to an earth and sand transport vehicle and pulling it manually, or pushing the earth and sand transport vehicle itself manually.

[0005] Regarding transport vehicles, for example, there is a disclosure in Patent Document 1. Patent Document 1 discloses an unmanned transport vehicle equipped with four swivelable swivel wheels on the front left and right and rear left and right of the vehicle body, separate forward drive units and reverse drive units on the front and rear sides of the vehicle body, and a swivel-preventing mechanism that prevents the rear swivel wheels from swiveling in accordance with the operation of the forward drive unit when moving forward, and prevents the front swivel wheels from swiveling in accordance with the operation of the reverse drive unit when moving backward. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-171010 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] In this process of transporting soil and sand within a steel pipe, the soil and sand excavated at the tunnel face are loaded onto the bed of a soil and sand transport vehicle, transported to the tunnel entrance, and then unloaded at the entrance. Therefore, it is necessary to be able to efficiently load the soil and sand onto the transport vehicle at the tunnel face and efficiently unload the soil and sand from the transport vehicle at the tunnel entrance.

[0008] This invention was made in light of the above-mentioned technical background, and aims to provide a loading platform that can efficiently carry out the loading and unloading of soil and sand in the transport of soil and sand inside a steel pipe. [Means for solving the problem]

[0009] To solve the above problems, the cargo bed of the present invention as described in claim 1 is a cargo bed that is placed on a soil transport vehicle that travels between the tunnel entrance side and the tunnel face side inside a rectangular cross-section steel pipe that is pressed into the ground to form a box-shaped roof in a trenchless tunneling method, wherein the cargo bed consists of a rectangular bottom plate and four side plates erected to surround the bottom plate, and the side plate on the tunnel face side has a notch formed at the top that is open at the top. A lifting device is attached to the side plate on the tunnel entrance side at a height of more than half the height of the loading platform and at one location in the width direction center, and to the side plate on the face side at a position below the notch and lower than half the height of the loading platform and at one location in the width direction center, the notch is formed with a predetermined width from the width direction center of the side plate on the face side, both sides of the side plate on the face side are formed to the same height as the adjacent side plate over a predetermined width, and the lower part of the notch and the part formed to the same height as the adjacent side plate of the side plate on the face side are integrated. It is characterized by the following: [Effects of the Invention]

[0012] According to the present invention, since a notch is formed in the side plate on the face side of the loading platform, it becomes possible to load soil and sand efficiently. Furthermore, since the loading platform is mounted on a soil transport vehicle, and lifting devices are attached to one location in the center of the width direction of both the side plate on the tunnel entrance side and the side plate on the face side, the loading platform alone can be lifted and the lifted loading platform can be easily inverted, making it possible to unload soil and sand efficiently. [Brief explanation of the drawing]

[0013] [Figure 1] This is an explanatory diagram showing a side view of a steel pipe for a box-shaped roof used in a soil transport vehicle according to one embodiment of the present invention. [Figure 2] This is a side view showing a soil transport vehicle according to one embodiment of the present invention, along with steel pipes for a box-shaped roof. [Figure 3] This is a plan view showing a soil transport vehicle according to one embodiment of the present invention, along with steel pipes for a box-shaped roof. [Figure 4] This is a front view of a soil transport vehicle according to one embodiment of the present invention, as seen from the tunnel entrance side of the steel pipe for the box-shaped roof. [Figure 5] This is a front view of a soil transport vehicle according to one embodiment of the present invention, as seen from the face side of the steel pipe for the box-shaped roof. [Figure 6] This is a cross-sectional view along line AA in Figure 3. [Figure 7] This is a side view showing the transport section that constitutes a soil transport vehicle according to one embodiment of the present invention. [Figure 8] This is a plan view showing the transport section that constitutes a soil transport vehicle according to one embodiment of the present invention. [Figure 9] This is a front view of the transport section constituting a soil transport vehicle according to one embodiment of the present invention, as seen from the tunnel entrance side of the steel pipe for the box-shaped roof. [Figure 10] This is a front view of the transport section constituting a soil transport vehicle according to one embodiment of the present invention, as seen from the face side of the steel pipe for the box-shaped roof. [Figure 11] This is a side view showing a cargo bed mounted on the earth and sand transport vehicle according to one embodiment of the present invention. [Figure 12] This is a plan view showing a cargo bed mounted on the earth and sand transport vehicle according to one embodiment of the present invention. [Figure 13] This is a front view of the cargo bed mounted on the earth and sand transport vehicle according to one embodiment of the present invention, viewed from the mine opening side of the steel pipe for the box-shaped roof. [Figure 14] This is a front view of the cargo bed mounted on the earth and sand transport vehicle according to one embodiment of the present invention, viewed from the face side of the steel pipe for the box-shaped roof. [Mode for Carrying Out the Invention]

[0014] Hereinafter, an embodiment as an example of the present invention will be described in detail based on the drawings. Note that in the drawings for describing the embodiment, the same reference numerals are assigned to the same components in principle, and repeated descriptions thereof will be omitted.

[0015] The earth and sand transport vehicle SV of the present embodiment is used for transporting excavated earth and sand inside the steel pipe for the box-shaped roof, which is constructed in the natural ground along the outer periphery of the planned installation area of the box body (tunnel main body) that is the main structure, in non-open-cut propulsion construction methods such as the R&C construction method and the SFT construction method.

[0016] As shown in FIG. 1, the steel pipe for the box-shaped roof (hereinafter simply referred to as "steel pipe") 1 has a rectangular cross-section (see FIG. 4 and FIG. 5), and a cutting edge 2 is attached to the tip in the press-fitting direction. The cutting edge 2 is composed of a hood-shaped cutting edge portion 2a that is formed to be inclined so that the upper side leads in a side view and excavates the natural ground, and a cylindrical cutting edge mounting portion 2b to which the cutting edge portion 2a is attached and which has a rectangular cross-section of the same shape as the steel pipe 1. At the time of press-fitting, a worker H enters the cutting edge mounting portion 2b and performs work of excavating the face which is the press-fitting surface of the steel pipe 1. At this time, the excavated earth and sand is loaded onto the earth and sand transport vehicle SV that reciprocates inside the steel pipe 1, transported from the face side to the mine opening side, and discharged to the outside.

[0017] At the four corners of both ends of the steel pipe 1 and the four corners on the steel pipe 1 side of the cutting edge 2, reinforcing flanges F each provided with a rib Fa extending in the axial direction of the steel pipe 1 and formed with a fastening hole Fb for bolt penetration and having an arc-shaped inner peripheral surface are arranged at intervals from each other (see Figure 4 and Figure 5). Then, the steel pipe 1 and the cutting edge 2 are fastened, and the steel pipe 1 and the steel pipe 1 are fastened by a fastener (not shown) composed of a bolt and a nut.

[0018] Next, the earth and sand transport vehicle SV traveling inside such a steel pipe 1 will be described.

[0019] As shown in Figure 2 to Figure 6, the earth and sand transport vehicle SV of the present embodiment is composed of a vehicle section V responsible for traveling functions, and a loading platform C for loading earth and sand placed on the upper surface of the vehicle section V.

[0020] As shown in Figure 2 to Figure 10, the vehicle section V includes a chassis 11 provided with a loading platform placement portion 11a (Figure 8) for placing the loading platform C carrying excavated earth and sand, drive wheels 12a and driven wheels 12b mounted on both sides of the chassis 11 in the traveling direction (that is, the portal side and the face side of the steel pipe 1 on the chassis 11), and guide rollers 14 attached to the outer side of side walls 13 erected on both side portions of the chassis 11 and configured to rotate in a horizontal plane, and travels by itself inside the steel pipe 1 to reciprocate between the portal and the face.

[0021] As shown in Figure 2, Figure 4 and Figure 5, in the present embodiment, the drive wheels 12a are installed on the portal side of the chassis 11, and the driven wheels 12b are installed on the face side of the chassis 11. The drive wheels 12a are arranged coaxially with a motor 16 that operates by receiving power supply from a battery 15a in an electrical component box 15 provided at the lower portion of the chassis 11, and are rotationally driven by the motor 16. Note that the earth and sand transport vehicle SV of the present embodiment travels at a speed of about 2.5 km per hour, and the operating time with the battery 15a is approximately 5 hours. The charging time of the battery 15a is 2 hours at 20A and 1 hour at 30A. However, it goes without saying that the specifications of the earth and sand transport vehicle SV are not limited to these numerical values.

[0022] Here, the reason the drive wheel 12a is installed on the tunnel entrance side of the chassis 11 is that if it were installed on the face side of the chassis 11, the drive wheel 12a and the motor 16, which is an electrical component, would be more likely to be covered with soil when the soil excavated at the face is loaded onto the loading platform C. However, the drive wheel 12a may be mounted on the face side and the driven wheel 12b may be installed on the tunnel entrance side.

[0023] Furthermore, as shown in Figures 4, 5, 9, and 10, in order to statically stabilize the chassis 11, the drive wheel 12a is composed of one wheel, while the driven wheel 12b is composed of two wheels. However, the drive wheel 12a may be composed of two wheels and the driven wheel 12b may be composed of one wheel, or both the drive wheel 12a and the driven wheel 12b may be composed of two wheels. In other words, since the goal is to stabilize the chassis 11, it is sufficient that at least one of the drive wheel 12a and the driven wheel 12b is composed of two wheels.

[0024] As shown in Figures 3 to 5, the guide rollers 14 are positioned so that the distance between their tips is shorter than the distance between them and the inner wall surface of the steel pipe 1, leaving a slight gap between them and the inner wall surface of the steel pipe 1. Furthermore, their mounting height is approximately half the height of the steel pipe 1. As a result, when the soil transport vehicle SV moves and sways from side to side, the guide rollers 14 come into contact with the inner wall surface and rotate, allowing the soil transport vehicle SV to self-propel through the steel pipe 1 while being guided by the inner wall surface.

[0025] Furthermore, as shown in Figures 2, 3, 7, and 8, in this embodiment, two pairs of guide rollers 14 are mounted spaced apart horizontally. This restricts two points on each side in the horizontal direction from the inner wall surface of the steel pipe 1, thereby stabilizing the horizontal posture of the earth transport vehicle SV while it is in motion. However, there may be only one pair of guide rollers 14.

[0026] The mounting height of the guide roller 14 can be freely set and is not limited to approximately half the height of the steel pipe 1 shown in this embodiment. Furthermore, the guide roller 14 only needs to be installed protruding outward from both sides of the chassis 11, and may be mounted in locations other than the side walls 13.

[0027] As shown in Figures 4 and 5, the aforementioned drive wheel 12a and driven wheel 12b are mounted on the bottom surface of the steel pipe 1 in a position where they travel between adjacent flanges F. The guide roller 14 is mounted on the side surface of the steel pipe 1 in a position where it passes between adjacent flanges F. This allows the earth transport vehicle SV to travel inside the steel pipe 1 without colliding with the flanges F.

[0028] Switch boxes 17 are provided on both sides of the chassis 11 in the direction of travel. These switch boxes 17 are mounted on the side wall 13 and are arranged facing the direction of travel and contain a power switch for turning the power on / off, a travel start switch (travel start means) for starting the rotational drive of the drive wheels 12a by the motor 16 at the tunnel entrance side or working face side of the steel pipe 1 to start the movement of the earth transport vehicle SV, a travel stop switch (travel stop means) for stopping the rotational drive of the drive wheels 12a by the motor 16 at the tunnel entrance side or working face side of the steel pipe 1 to stop the movement of the earth transport vehicle SV, and an emergency stop switch (travel stop means) for making an emergency stop on the earth transport vehicle SV while it is in motion. These switches are operated by the worker H.

[0029] As shown in Figures 4, 5, 9, and 10, a mechanism is provided on both sides of the chassis 11 in the direction of travel to stop the rotational drive of the drive wheels 12a by the motor 16 and stop the vehicle from traveling. In this embodiment, a retroreflective (mirror-type) photoelectric sensor (travel stopping means) 18a, a diffuse reflective photoelectric sensor (abnormal stop means) 18b, and a tape switch (abnormal stop means) 18c are used. The retroreflective photoelectric sensor 18a is a sensor that detects reflected light from reflectors 30 (Figures 2 and 3) installed at the tunnel entrance end 1a and the face end 1b of the steel pipe 1. When the reflected light is detected at the stopping position, the drive of the drive wheels 12a by the motor 16 is automatically stopped. The diffuse reflective photoelectric sensor 18b is a sensor that detects reflected light from a detected object. When the presence of a detected object is detected by receiving reflected light from the detected object (i.e., in the event of an abnormality), the drive of the drive wheels 12a by the motor 16 is automatically stopped. The tape switch 18c is a tape-shaped pressure-sensitive switch with snap-action contacts. When an abnormality occurs and operator H touches the tape switch 18c, the motor 16 automatically stops driving the drive wheels 12a. The means for stopping the vehicle from moving or stopping it in case of an abnormality may be one or two of the retroreflective photoelectric sensor 18a, the diffuse reflective photoelectric sensor 18b, and the tape switch 18c, or other means may be used.

[0030] Furthermore, in conjunction with the emergency stop switch provided in the aforementioned switch box 17, if it becomes necessary to stop the moving earth transport vehicle SV, the motor 16 will stop driving the drive wheels 12a.

[0031] As shown in the figures, the retroreflective photoelectric sensor 18a is located on the underside of the chassis 11, the diffuse reflective photoelectric sensor 18b is located on the side wall 13 opposite to the side wall 13 where the switch box 17 is installed, and the tape switch 18c is installed vertically in two locations on both sides of the tunnel entrance side wall 19a and the tunnel face side wall 19b, which are erected on the tunnel entrance side and the tunnel face side of the chassis 11, respectively. The tape switch 18c is also installed at the foremost position on the tunnel entrance side and the tunnel face side of the earth transport vehicle SV, as shown in Figures 2 and 3, so that it can be easily touched by workers. The diffuse reflective photoelectric sensor 18b is installed in the side box 21 of the side wall 13 together with the headlight 20, which consists of LED lights.

[0032] As shown in Figures 2 and 3, in this embodiment, stoppers 31 are installed at the tunnel entrance end 1a and the face end 1b of the steel pipe 1, so that the drive wheel 12a or driven wheel 12b can contact them to stop the earth transport vehicle SV. As a result, even if the earth transport vehicle SV reaches the tunnel entrance or face side of the steel pipe 1 and does not stop automatically for any reason, it will be forcibly stopped by the stoppers 31, so it will not go out of the tunnel entrance or enter the cutting edge 2 (Figure 1).

[0033] As shown in Figure 8, the loading platform 11a is provided with a restricting member 22 to restrict the horizontal loading position of the loading platform C. This restricting member 22 consists of angle members 22a provided on both sides of the chassis 11 in the direction of travel, and a long plate 22b attached to the side wall 13 of the chassis 11. The angle members 22a are bolted to each side of the chassis 11 in the direction of travel at intervals, in two places each, and restrict the displacement of the loading platform C relative to the direction of travel. The plate 22b is attached so as to extend vertically at a right angle to the side wall 13, and restricts the displacement of the loading platform C in a direction perpendicular to the direction of travel.

[0034] The area enclosed by these angle members 22a and plate 22b is somewhat wider than the bottom surface of the cargo bed C (see Figure 3), making it easier to place the cargo bed C on the cargo bed mounting section 11a.

[0035] As shown in Figures 2, 3, 7, and 8, the plate 22b is installed on the back side of the side wall 13 where the guide roller 14 is attached. This ensures that when the guide roller 14 contacts the inner wall surface of the steel pipe 1 and exerts a force pushing the side wall 13 inward, the plate 22b reinforces the side wall 13 to counteract this force.

[0036] Now, as shown in Figure 9, when viewing the vehicle section V of the earth transport vehicle SV from the tunnel entrance side of the steel pipe 1, the tunnel entrance side wall 19a is cut out in a U-shape and opens upwards. A handle 23 is attached to the outside of the central part for gripping when a worker on the tunnel entrance side pulls the earth transport vehicle SV towards them. On the other hand, as shown in Figure 10, when viewing the vehicle section V of the earth transport vehicle SV from the face side of the steel pipe 1, the face side wall 19b is shaped to be separated laterally (i.e., divided into a left face side wall 19b and a right face side wall 19b) so that earth spilled from the loading platform C can be swept out towards the face. However, if there is concern about deformation of this member when it is shaped to be separated laterally, it can be made into an open shape similar to the tunnel entrance side wall.

[0037] Next, the loading platform C, which is placed on the loading platform mounting section 11a, is a box shape formed by a rectangular bottom plate 40 and four side plates 41-44 erected to surround the bottom plate 40, as shown in Figures 11-14. In addition, the side plate 44 on the face side of the loading platform C has a notch 44a with an open top, making it easier to load soil and sand at the face. This notch 44a is formed with a predetermined width from the center in the width direction, and in this embodiment, the horizontal direction is approximately the entire width of the side plate 44 on the face side, and the vertical direction is lower than half the height of the side plate 44 on the face side. However, the shape of the notch 44a is not limited to this embodiment. In addition, although the loading platform C is intended for loading excavated soil and sand, it may also be used to load things other than soil and sand (for example, various tools and jigs used during excavation).

[0038] In these drawings, lifting devices 45 are attached to the side plate 43 on the tunnel entrance side and the side plate 44 on the tunnel face side of the loading platform C, for attaching a hook (not shown) to the end of a crane wire when lifting the loading platform C. One lifting device 45 is attached to the center of the width direction of each side plate 43 and 44, and the loading platform C is lifted at two points by these lifting devices 45.

[0039] In this case, if the lifting device 45 is attached to two locations on each side, for a total of four locations, and the loading platform C is lifted at four points, the loading platform C will be stable during lifting, but it will be difficult to invert the loading platform C, making it difficult to unload the soil. In contrast, in this embodiment, the lifting device 45 is attached to one location each on the side plate 43 on the tunnel entrance side and the side plate 44 on the tunnel face side, so that the loading platform C is lifted at two points. Moreover, since these lifting devices 45 are attached to the center in the width direction of the side plates 43 and 44, it becomes easier to invert the loading platform C, making it possible to unload the soil efficiently. When the loading platform C is lifted at two points, the worker will support and stabilize the loading platform C during lifting.

[0040] As shown in the figure, the lifting device 45 for the side plate 44 on the face side is mounted below the notch 44a, which is lower than half the height of the loading platform C, because the side plate 44 has a notch 44a formed in it. In contrast, the lifting device 45 for the side plate 43 on the tunnel entrance side is mounted slightly higher than half the height of the loading platform C. If the lifting device 45 for the side plate 43 on the tunnel entrance side is mounted at the same position as the lifting device 45 for the side plate 44 on the face side (lower than half the height of the loading platform C), the center of gravity of the loading platform C will be higher and unstable when lifted. However, if the lifting device 45 for the side plate 43 on the tunnel entrance side is mounted slightly higher than half the height of the loading platform C, as in this embodiment, instability will not occur. Note that the lifting device 45 for the side plate 43 on the tunnel entrance side is not limited to the mounting position shown in this embodiment, and may be mounted at a position lower than half the height of the loading platform C. However, it is desirable to attach the lifting device 45 to the side plate 43 on the tunnel entrance side at a position greater than half the height of the loading platform C, so that the loading platform C does not become unstable during lifting.

[0041] Thus, in this embodiment, since the vertical direction of the notch 44a is lower than half the height of the side plate 44 on the face side, the lifting device 45 on the side plate 44 on the face side is mounted at a position lower than half the height of the loading platform C. However, if the vertical direction of the notch 44a is higher than half the height of the side plate 44 on the face side, the lifting device 45 may be mounted at a position higher than half the height of the loading platform C.

[0042] Furthermore, when the cargo bed C is placed on the cargo bed mounting section 11a of the chassis 11, the lifting devices 45 attached to the side plate 43 on the tunnel entrance side and the lifting devices 45 attached to the side plate 44 on the tunnel face side are located in openings formed in the tunnel entrance side wall 19a and the tunnel face side wall 19b, respectively, thus avoiding interference with the tunnel entrance side wall 19a and the tunnel face side wall 19b themselves.

[0043] Next, we will explain the operation of the earth and sand transport vehicle SV having this configuration.

[0044] When a worker on the tunnel face loads excavated soil onto the cargo bed C of the soil transport vehicle SV and presses the start button on the switch box 17, the soil transport vehicle SV starts moving through the steel pipe 1 towards the tunnel entrance. Guided by the guide rollers 14 along the inner wall of the steel pipe 1, it self-propels through the steel pipe 1 to reach the tunnel entrance, where it stops when a worker on the tunnel entrance side presses the stop button.

[0045] On the tunnel entrance side, a worker attaches a hook to the lifting device 45, operates the crane to lift the loading platform C, reverses it at a designated position to unload the soil, and places the now empty loading platform C back onto the loading platform mounting section 11a. Then, when the worker on the tunnel entrance side presses the start button, the soil transport vehicle SV self-propells through the steel pipe 1 and returns to the tunnel face, and when the worker on the tunnel face side presses the stop button, it stops. By repeating this process, the soil excavated at the tunnel face is loaded onto the self-propelled soil transport vehicle SV, transported to the tunnel entrance, and discharged to the outside.

[0046] Furthermore, according to this embodiment, a notch 44a is formed in the side plate 44 on the face side of the loading platform C, making it easier to load soil and sand on the face side. Also, since the loading platform C is mounted on the soil transport vehicle SV, and lifting devices 45 are attached to one location in the width direction of the center of the side plate 43 on the tunnel entrance side and the side plate 44 on the tunnel face side, the loading platform C can be lifted by operating the crane and the lifted loading platform C can be easily inverted, making it easier to unload soil and sand on the tunnel entrance side.

[0047] The present inventors have described the invention in detail based on embodiments, but the embodiments disclosed herein are illustrative in all respects and are not limited to the disclosed technology. That is, the technical scope of the present invention should not be interpreted restrictively based on the description of the embodiments above, but rather in accordance with the claims, and includes the equivalent technology of the claimed technology and all modifications that do not depart from the gist of the claims. [Industrial applicability]

[0048] This invention can be widely applied to the transport of excavated soil when forming a box-shaped roof on the ground in trenchless tunneling methods such as the R&C method and the SFT method. [Explanation of Symbols]

[0049] 1 Steel pipe 1a End of wellhead side 1b End of tunnel face 11 chassis 11a Loading platform 12a Drive wheels 12b Driven wheel 13 Side wall 14 Guide rollers 15. Electrical component box 15a battery 16 motors 17 Switchbox 18a Retroreflective photoelectric sensor (means for stopping vehicle movement) 18b Diffuse reflection type photoelectric sensor (abnormal stop mechanism) 18c Tape switch (abnormal stop mechanism) 19a Well mouth side wall 19b Side wall of the tunnel face 22 Regulating members 22a Angle material 22b Plate 23 Handle 30 Reflectors 31 Stopper 40 Bottom plate 41-44 Side panels 44a Notch 45 Lifting equipment C Cargo bed F flange Fa Rib Fb fastening hole H worker SV soil transport vehicle V Vehicle Department

Claims

[Claim 1] A loading platform placed on a soil transport vehicle that travels between the tunnel entrance side and the tunnel face side inside a rectangular cross-section steel pipe that is pressed into the ground to form a box-shaped roof in a trenchless tunneling method, The aforementioned cargo bed is It consists of a rectangular base plate and four side plates erected to surround the base plate. The aforementioned side plate on the face side has a notch formed in which the top is open. A lifting device is attached to the side plate on the tunnel entrance side at a height of more than half the height of the loading platform and at one location in the center in the width direction, and to the side plate on the tunnel face side at a position below the cutout and lower than half the height of the loading platform and at one location in the center in the width direction. The aforementioned notch is formed with a predetermined width from the center in the width direction of the side plate on the face side, and both sides of the side plate on the face side are formed to the same height as the side plate adjacent to it over a predetermined width. The side plate on the face side has a portion formed at the same height as the adjacent side plate, with the lower part of the notch and the adjacent side plate being integrated into one piece. A cargo bed characterized by the following features.

Images