Material handling equipment

Abstract

To provide a material transport device capable of efficiently transporting materials even when equipped with an inner push device. [Solution] A material transport device 6 is provided inside a tunnel in which a push device 5 is installed, and is equipped with a face-side fixed track 611 installed closer to the tunnel face than the push device 5, a mine-mouth-side fixed track 612 installed closer to the mine-mouth than the push device 5, a movable track 64 installed so as to straddle the push device 5, and a carriage 62 that can run on the face-side fixed track 611, the mine-mouth-side fixed track 612 and the movable track 64, and when the movable track 64 is moved towards the face, the face-side fixed track 611 and the movable track 64 are connected, and when the movable track 64 is moved towards the mine-mouth, the mine-mouth-side fixed track 612 and the movable track 64 are connected.

Description

[Technical Field]

[0001] The present invention relates to a material transport device. [Background technology]

[0002] At the junctions of road tunnels and the station areas of railway tunnels, underground spaces with larger cross sections are formed than those of ordinary main line tunnels. Patent Document 1 discloses a method for constructing large cross section underground spaces, in which a radial space is formed from an existing tunnel in a direction perpendicular to the tunnel axis, and then a circular tunnel formed by a jacking method is connected to the side wall of this radial space to form a cylindrical outer shell that surrounds the existing tunnel, and the area surrounded by the cylindrical outer shell is excavated to form the large cross section underground space.

[0003] The jacking method is a method of constructing a tunnel by sequentially pushing multiple boxes into the ground using a jack installed inside the starting base. However, if the thrust of the jack cannot be sufficiently transmitted to the tip of the tunnel, such as when there are sharp curves or the tunnel is long, it is necessary to install an intermediate jack equipped with a jack at an appropriate location in the tunnel axis direction (including inside the tunnel boring machine).

[0004] In the case of tunnel jacking, if the thrust of the main jack cannot be sufficiently transmitted to the tunnel tip, such as when the tunnel has sharp curves or is long, it is necessary to install a propulsion device (such as a central thrust device) equipped with a propulsion jack at an appropriate location in the tunnel axial direction (including inside the tunnel boring machine). One known propulsion device is described in Patent Document 2, for example. This propulsion device is equipped with a double-structured inner tube that surrounds the jack and an outer tube that surrounds the inner tube. The inner tube is extendable and retractable in accordance with the extension and retraction of the jack.

[0005] Tunnel construction involves the transportation of various materials. For example, in the shield tunneling method, segments are transported and excavated soil is removed. In the jacking method, there is no need to extend the box body or equipment at the tunnel face, but it is necessary to transport thrusters, fluid equipment, lubricant injection equipment, replacement parts for lighting, etc., and surveying equipment. Material transport equipment for these materials is generally used. This material transport equipment may be a material transport device that runs on rails installed inside the tunnel. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 7498146 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-032794 Summary of the Invention [Problem to be solved by the invention]

[0007] In the jacking method using a push-in device, the length of the push-in device changes as the push-in jack extends and retracts, making it impossible to install fixed rails. An object of the present invention is to provide a material transport device that can transport materials efficiently even when equipped with an inner push device. [Means for solving the problem]

[0008] To solve the above problem, the present invention provides a material transport device installed inside a tunnel in which a push-in device is installed, the material transport device being installed closer to the tunnel face than the push-in device. , fixed to structural members in the tunnel The fixed track on the face side and the center push device are installed closer to the entrance of the tunnel. , fixed to structural members in the tunnel The moving track is provided with a fixed track on the wellhead side, a movable track installed so as to straddle the central pushing device, and a carriage that can travel on the fixed track on the face side, the fixed track on the wellhead side, and the movable track. For the base fixed to the box located before and after the central push device Able to move in the tunnel axial direction Supported by It is held The end of the movable track and the end of the face side fixed track and the end of the wellhead side fixed track are provided with fitting means that fit together with each other, When the movable track is moved toward the face side, the face side fixed track and the movable track are connected, and when the movable track is moved toward the minehead side, the minehead side fixed track and the movable track are connected.

[0009] According to this material transport device, even if the length of the central push device changes due to the extension and contraction of the jack, the movable track can move, ensuring a track for the carriage to travel on, allowing for efficient transport of materials, etc. It is desirable that the movable track be pushed and pulled by an actuator.

[0010] Furthermore, when a base is provided that is fixed to the inner surface of the housing, it is desirable that the movable track be slidable relative to the base. It is also desirable to provide a first sensor that detects whether the fixed track on the mine head side and the movable track are connected, and a second sensor that detects whether the fixed track on the face side and the movable track are connected. Furthermore, it is more preferable to provide a third sensor for detecting whether the carriage has stopped on the movable track. [Effects of the Invention]

[0011] According to the material conveying device of the present invention, even when it is provided in a center push device, materials can be conveyed efficiently. It is possible. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a cross-sectional view showing the tunnel of the present embodiment. [Figure 2] A cross-sectional view of the tunnel. [Figure 3] 1A and 1B are diagrams showing a tunneling machine, in which (a) is a longitudinal section and (b) is a cross-sectional view. [Figure 4] 1A and 1B are diagrams showing an inner push device, in which (a) is a cross-sectional view and (b) is a longitudinal section. [Figure 5] 1A and 1B are diagrams showing a part of a material transport device, in which FIG. 1A is a longitudinal section and FIG. 1B is a transverse section. [Figure 6]1A and 1B are diagrams showing a material transport device in a center push device, in which FIG. 1A is a longitudinal sectional view and FIG. 1B is a transverse sectional view. [Figure 7] This is a longitudinal cross-sectional view showing the material transport device in the center push device, where (a) shows the center push jack in a retracted state, (b) shows the movable track in a state where it has moved toward the mine entrance, and (c) shows the movable track in a state where it has moved toward the face. DETAILED DESCRIPTION OF THE INVENTION

[0013] In this embodiment, a case where an underground structure 1 having a large cross-sectional underground space surrounding an existing tunnel will be described. The underground structure 1 is shown in FIGS. 1 and 2. As shown in FIGS. 1 and 2, the underground structure 1 is a skirting wall constructed at the end of a road junction, and is formed in a cylindrical shape by connecting an annular tunnel 13 surrounding an existing tunnel 10, which is a ramp tunnel 11 and a main tunnel 12, in the axial direction of the existing tunnel 10. As shown in FIG. 1, the annular tunnel 13 is constructed by a jacking method, using a radial space (vertical shaft 14) formed from the existing tunnel 10 (the ramp tunnel 11 in this embodiment) in a direction approximately perpendicular to the tunnel axis as a starting and ending base.

[0014] The circular tunnel 13 is constructed by sequentially pushing multiple propulsion boxes 2, 2, ... into the ground using a main pushing device 3 installed inside a vertical shaft 14. The propulsion system of this embodiment comprises the main pushing device 3, a tunnel excavator 4, a middle pushing device 5, and a material transport device 6. The circular tunnel 13 is curved and has a long tunnel length, and the thrust of the main pushing device 3 is not sufficiently transmitted to the tunnel tip. Therefore, propulsion devices (the tunnel excavator 4 and the middle pushing device 5) equipped with propulsion jacks are provided at appropriate locations in the tunnel axial direction (including inside the tunnel excavator 4).

[0015] The propulsion box 2 is pushed into the ground by the main pushing device 3. As shown in FIG. 2, the propulsion box 2 is a steel shell having a rectangular cross section. The propulsion box 2 of this embodiment includes main girders 21 formed into a frame shape by combining steel materials, vertical ribs (not shown) interposed between adjacent main girders 21 in the axial direction, an outer shell 22 covering the outer surfaces of the main girders 21, and support columns 23 erected within the propulsion box 2. A partition wall (fence) 24 is provided inside the propulsion box 2, dividing the space into a space where the material conveying device 6 is installed and other spaces (passageways, work spaces, etc.). The configuration of the propulsion box 2 is not limited; for example, the support columns 23 may be provided as needed. The cross-sectional shape of the propulsion box 2 is not limited; for example, it may be circular.

[0016] As shown in FIG. 1 , the main pushing device 3 is provided in the vertical shaft T and applies a propulsive force to the propulsion box body 2. The main pushing device 3 is provided on a stand (not shown) formed in the vertical shaft T and has a plurality of main pushing jacks 31. The main pushing jacks 31 secure a reaction force from the stand and apply a propulsive force to the propulsion box body 2.

[0017] FIG. 3 shows the tunneling machine 4. As shown in FIGS. 3(a) and (b), the tunneling machine 4 has the same cross-sectional shape (rectangular) as the propulsion box 2, and includes a front body 42 and a rear body 43. In this embodiment, the length of the lower part (length in the tunnel axial direction) is longer than that of the upper part, in accordance with the curved tunnel alignment. The front body 42 is equipped with a cutter head 44 on its front side. The rear body 43 is equipped with multiple machine jacks 41 (propulsion jacks) and a rear slab 45 to which the rear ends of the machine jacks 41 are attached and which abuts against the propulsion box 2. The tunneling machine 4 cuts the natural ground with the cutter head 44, and the machine jacks 41 receive reaction force from the propulsion box 2 at the rear, applying propulsion force to the tunneling machine 4, thereby controlling its direction as it moves forward. In other words, the tunneling machine 4 in this embodiment also functions as a propulsion device.

[0018] The central pushing device 5 is disposed between the main pushing device 3 and the tunneling machine 4, and applies a thrust to the tunneling machine 4 with respect to the propulsion box 2 (see FIG. 1). FIG. 4 shows the central pushing device 5. As shown in FIGS. 4(a) and 4(b), the central pushing device 5 has the same cross-sectional shape (rectangular) as the propulsion box 2. In this embodiment, the central pushing device 5 is longer at the bottom than at the top, in accordance with the curved tunnel alignment. The central pushing device 5 comprises three propulsion units 50, 50, 50 arranged side by side. The left and right propulsion units 50 have a plurality of central pushing jacks 51, 51, ... arranged in a ring shape, and the central propulsion unit 50 has a plurality of central pushing jacks 51, 51, ... arranged horizontally in two rows, one above the other. The rear ends of the multiple central pushing jacks 51, 51, ... are attached to a rear plate 52 that abuts against the rear propulsion box 2.

[0019] Figure 5 shows the material conveying device 6. As shown in Figure 5, the material conveying device 6 includes a track 61 and a carriage 62 that travels on the track 61. The material conveying device 6 of this embodiment uses a rack and pinion, which allows the carriage 62 to travel in a vertical direction or in an inverted state.

[0020] The track 61 extends along the axial direction of the tunnel. A rack (not shown) is formed on the track 61. The track 61 is a rail on which a carriage 62 can run, and is supported by supports 63. The supports 63 are made of steel and are erected inside the propulsion box 2. The supports 63 are arranged at predetermined intervals in the tunnel axial direction. In this embodiment, one support 63 is provided for each of three consecutive propulsion boxes 2. The track (fixed track) 61 laid in the general section is fixed via the supports 63.

[0021] The carriage 62 includes a platform 65 for holding materials, multiple wheels (pinions) 66, 66, ... provided on the platform 65, and a motor 67 for applying rotational force to the wheels 66. The carriage 62 has a shape that allows it to pass through the hollow portion of the propulsion unit 50 of the central push device 5, and runs along the track 61 inside the tunnel using the power of the motor 67. The structure of the platform 65 can be modified as appropriate depending on the object being transported. The wheels 66 support the carriage 62 at three points on the track 61 (top, side, and bottom), allowing the carriage 62 to move horizontally, vertically, and inverted. The platform 65 is configured to be able to support the object not only when the carriage 62 is moving horizontally, but also when it is moving vertically or upside down.

[0022] FIG. 6 shows the material conveying device 6 through which the central push device 5 is inserted. In the portion where the central push device 5 is provided, the track 61 is replaced with a movable track 64. The movable track 64 is provided so as to straddle the central push device 5. The movable track 64 is a rail on which the carriage 62 can run, and passes through the hollow portion of the propulsion unit 50 of the central push device 5. As shown in FIG. 6(a), the movable track 64 has a length that passes through the central push device 5, and both ends of the movable track 64 protrude to the front and rear of the central push device 5. Fitting means 643 (protrusions in this embodiment) are formed on the front and rear end faces of the movable track 64. Furthermore, limit switches are provided on both ends of the movable track 64.

[0023] Sliding rails 641 are fixed to the underside of both ends of the movable track 64. The sliding rails 641 are slidably supported on pedestals 642 provided on the propulsion boxes 2 arranged before and after the central push device 5. In other words, the movable track 64 is supported by the propulsion boxes 2, 2 arranged before and after the central push device 5 in a state where it can move in the tunnel axial direction.

[0024] A face-side fixed track 611 (part of the track 61 in FIG. 5) is provided closer to the tunnel face than the central push device 5, and a wellhead-side fixed track 612 (part of the track 61 in FIG. 5) is provided closer to the tunnel mouth than the central push device 5. Engagement means 613 (recesses in this embodiment) that engage with engagement means 643 is formed on the end faces of the face-side fixed track 611 and the wellhead-side fixed track 612 on the movable track 64 side. The distance between the face-side fixed track 611 and the wellhead-side fixed track 612 when the central push device 5 (central push jack 51) is retracted is equal to the length of the movable track 64.

[0025] The following describes the operating state of the movable track 64 when the carriage 62 passes through the inner push device 5. Figure 7 shows the state of the movable track 64 according to the state of the inner push device 5. When the central push device 5 (central push jack 51) is retracted, as shown in Figure 7(a), one end of the movable track 64 abuts against or is close to the face-side fixed track 611, and the other end of the movable track 64 abuts against or is close to the wellhead-side fixed track 612, so that the face-side fixed track 611 and the wellhead-side fixed track 612 are connected via the movable track 64. At this time, the limit switches installed on both ends of the movable track 64 are turned ON, and a signal is sent indicating that the carriage 62 can pass.

[0026] On the other hand, when the central push device 5 (central push jack 51) is extended, a gap is formed between the movable track 64 and the face-side fixed track 611, or between the movable track 64 and the wellhead-side fixed track 612 (see Figure 7(b) or (c)). When the central push device 5 is extended, the carriage 62 can be passed by moving the movable track 64 while the carriage 62 is stopped on the movable track 64. The movable track 64 is pushed and pulled by a track jack 644 (actuator) driven by hydraulic pressure or a motor.

[0027] For example, when passing the carriage 62 from the wellhead side (the head jack 31 side) to the face side (the tunneling machine 4 side), first, as shown in FIG. 7(b), the movable track 64 is moved to the wellhead side (the left side in FIG. 7(b)) to connect the wellhead-side fixed track 612 and the movable track 64. This causes the wellhead-side engagement means 643, 613 to engage, and only the wellhead-side limit switch (first sensor) of the movable track 64 turns ON, allowing the carriage 62 to move between the movable track 64 and the wellhead-side fixed track 612. After confirming that the limit switch (first sensor) is ON, the carriage 62 is advanced from the wellhead side into the center pusher 5 and stopped on the movable track 64. Note that the movable track 64 in this embodiment is provided with a stop position limit switch for detecting the stop position of the carriage 62, and the carriage 62 is stopped at a position where the stop position limit switch (third sensor) turns ON.

[0028] Once the carriage 62 has been stopped at a predetermined position, as shown in Figure 7(c), the movable track 64 is moved to the face side, and the face-side fixed track 611 and the movable track 64 are connected. At this time, the face-side fitting means 643, 613 are fitted together, and only the limit switch (second sensor) on the face side of the movable track 64 is turned ON. Once it has been confirmed that the limit switch (second sensor) has been turned ON, the carriage 62 is moved from the movable track 64 to the face-side fixed track 611, and advanced outside the intermediate push device 5.

[0029] When passing the carriage 62 from the face side to the mineshaft side, first, the movable track 64 is moved to the face side so as to communicate with the face-side fixed track 611. Next, the carriage 62 is moved into the inner thrust device 5 and placed on the movable track 64. Subsequently, the movable track 64 is moved to the mineshaft side so as to communicate with the mineshaft-side fixed track 612. Then, the carriage 62 is moved from the movable track 64 to the mineshaft-side fixed track 612 and advanced out of the inner thrust device 5.

[0030] According to the construction method of this embodiment, even when a central push device is used, the movable track 64 allows the carriage 62 to travel the entire length of the tunnel. In other words, even when the length of the central push device 5 changes due to the extension and contraction of the central push jack 51, the movable track 64 moves, so that a track for the carriage 62 to travel between the fixed tracks (face-side fixed track 611 and tunnel mouth-side fixed track 612) provided on either side of the central push device 5 can be secured, allowing materials and the like to be transported efficiently.

[0031] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and each of the above-described components can be appropriately modified within the scope of the invention. In the above embodiment, the construction of the ring-shaped tunnel 13 has been described, but the shape of the tunnel is not limited thereto, and it may be, for example, a linear tunnel.

[0032] The number of central thrust devices 5 used in tunnel construction is not limited, and may be determined appropriately in relation to the thrust length, required thrust force, etc. In the above embodiment, a limit switch is installed on the movable track 64, but the limit switch may be used as needed. Also, a sensor or the like may be used instead of the limit switch. [Explanation of symbols]

[0033] 1 Underground structure 10 Existing tunnels 11 Ramp Tunnel 12 Main Line Tunnel 13 Circular Tunnel 14 Shaft 2 Propulsion box 21 Main girder 22 Outer shell 23 Pillar 3 Main push device 31 Push jack 4 excavator 41 Machine jack (propulsion jack) 42 Front body 43 Rear fuselage 44 Cutter Head 45 later edition 5. Center push device 50 Propulsion Unit 51 Center jack 52 later edition 6 Material handling equipment 61 Orbit (fixed orbit) 611 Face side fixed track 612 Fixed track on wellhead side 62 Cart 63 Pillar 64 Movable track

Claims

1. A material transport device installed inside a tunnel in which an inner push device is installed, A face-side fixed track that is installed closer to the tunnel face than the central push device and is fixed to a structural member inside the tunnel; A tunnel entrance side fixed track installed closer to the tunnel entrance than the central push device and fixed to a structural member inside the tunnel; A movable track installed so as to straddle the central push device; A carriage is provided which can travel on the face side fixed track, the wellhead side fixed track, and the movable track, The movable track is supported in a state in which it can move in the tunnel axial direction relative to a base fixed to a box body arranged before and after the central push device, The end of the movable track and the end of the face side fixed track and the end of the wellhead side fixed track are provided with fitting means that fit together with each other, A material transport device characterized in that when the movable track is moved toward the face side, the fixed track on the face side and the movable track are connected, and when the movable track is moved toward the minehead side, the fixed track on the minehead side and the movable track are connected.

2. 2. The material transport device according to claim 1, further comprising an actuator for pushing and pulling the movable track.

3. A material transport device as described in claim 1, characterized in that it is equipped with a first sensor that detects whether the fixed track on the minehead side and the movable track are connected, and a second sensor that detects whether the fixed track on the face side and the movable track are connected.

4. 2. The material transport device according to claim 1, further comprising a third sensor for detecting whether the carriage has stopped on the movable track.

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