Push-through tunnel

Abstract

To provide a propulsion tunnel that allows people to ascend and descend and pass through even when the direction of a box body changes. [Solution] A propulsion tunnel having a curved section, in which at least one box is inverted upside down during the process of sequentially pushing multiple propulsion boxes 2 into the curved section, the propulsion boxes 2 having work passages 7 provided on the inner surface that is radially inward and the inner surface that is radially outward in the curved section, and at least one propulsion box 2 has a scaffolding surface material 73 provided so as to intersect with the work passage 7.

Description

[Technical Field]

[0001] The present invention relates to a propulsion tunnel. [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 tunnel construction method in which multiple tunnel bodies are sequentially pushed underground using a jack installed in a launching base. In tunnels with sharp curves or long tunnels, the thrust of the jack may not be transmitted sufficiently to the tunnel tip. In such cases, a jacking device equipped with a jack must be installed at an appropriate location along the tunnel axis (including inside the tunnel boring machine). Furthermore, in tunnel jacking, extension work for underground facilities (fluid equipment and its piping, lubricant injection equipment and its piping, lighting, ventilation pipes, cables, elevator equipment, etc.) may be performed simultaneously with the assembly of the tunnel body at the launching base. In such cases, a passageway for personnel to pass through within the tunnel body is required. For example, Patent Document 2 discloses a tunnel body for jacking that ensures a work passageway space, in which a jacking device is used to move the jack to a predetermined position while pushing it. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7498146 [Patent Document 2] Japanese Patent Application Publication No. 06-158988 Summary of the Invention [Problem to be solved by the invention]

[0005] Construction of a circular tunnel begins at the starting point, and is carried out by turning 360 degrees while advancing until it reaches the starting point. Therefore, the direction of the box gradually changes from horizontal at the start of excavation, then upward, then horizontal, and finally downward. Therefore, a work passage is required inside the box that allows access and climbing, regardless of the box's orientation (direction).

[0006] The present invention aims to provide a tunnel that allows people to climb up and down and pass through even when the orientation of the box body changes. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a propulsion tunnel having a curved section, in which at least one of the boxes is turned upside down in the process of sequentially pushing a plurality of boxes into the curved section, The alignment of the tunnel The inner surface that is the radially inner side and The linear On the inner surface that is radially outward, At least two lines along the axis of the tunnel It has a working passage.

[0008] With this type of tunnel, by using either the radially inner or radially outer access passage in the curved section, it is possible to pass through even when the direction of the box changes. In other words, in sections where using either the radially inner or radially outer access passage would require passage in an overhanging state, it is possible to move safely by using the other access passage.

[0009] If at least one of the boxes of the driving tunnel has a scaffolding surface that intersects with the work passage, the scaffolding surface can be used to move from either the radially inner or radially outer work passage to the other work passage. It is desirable that the scaffolding surface has a cover material that covers an entrance to the work passage. This cover material may be slidable along guide rails arranged on both sides of the entrance. Furthermore, if the propulsion tunnel is equipped with a ladder arranged along the working passage, people can ascend and descend without having to remove and install a movable ladder. [Effects of the Invention]

[0010] According to the push-through tunnel of the present invention, people can climb up and down and pass through even if the orientation of the box body changes. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view showing an underground structure of the present embodiment. [Figure 2] 1A and 1B are diagrams showing a propulsion box, in which (a) is a front view and (b) is a side view. [Figure 3] FIG. 1 is a side view showing a portion of the circular tunnel. [Figure 4] FIG. 1 is a cross-sectional view showing a portion of a circular tunnel. [Figure 5] 1A and 1B are diagrams showing a propulsion box with a scaffold, in which (a) is a front view and (b) is a side view. [Figure 6] This is a cross-sectional view showing the traffic route during construction of the circular tunnel at the start stage. [Figure 7] FIG. 7 is a cross-sectional view showing the traffic route during construction of the ring tunnel, following FIG. 6. [Figure 8] FIG. 8 is a cross-sectional view following FIG. 7 showing the traffic route during construction of the ring tunnel. [Figure 9] FIG. 9 is an enlarged view of part A in FIG. 8. [Figure 10] FIG. 9 is a cross-sectional view showing the traffic route during construction of the ring tunnel, following FIG. 8. [Figure 11] FIG. 11 is an enlarged view of part B in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] In this embodiment, a case where an underground structure 1 having a large cross-sectional underground space is formed will be described. FIG. 1 shows the underground structure 1. The underground structure 1 is formed in a cylindrical shape by connecting multiple ring tunnels 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 ring tunnel 13 is formed by a jacking method, with 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.

[0013] The circular tunnel 13 is constructed by sequentially pushing multiple thrust boxes (boxes) 2, 2, ... into the ground using a thrust device 3 installed inside a vertical shaft 14. The circular tunnel 13 is curved and has a long tunnel length, and the thrust force of the thrust device 3 cannot be sufficiently transmitted to the tip of the tunnel. Therefore, thrust devices (excavator 4 and middle thrust device 5) equipped with thrust jacks are installed at appropriate locations (including inside the tunnel excavator 4) in the tunnel axial direction.

[0014] The annular tunnel 13 has a curved shape (curved section) along its entire length, and in the process of sequentially pushing in the multiple propulsion boxes 2, 2, ..., at least some of the propulsion boxes 2 are turned upside down. Figure 2 shows the propulsion box 2. As shown in Figure 2(a), the propulsion box 2 is a steel shell that is rectangular in cross section (front view). Also, as shown in Figure 2(b), the propulsion box 2 has a trapezoidal shape in side view, with its radially outer length (approximately 1 m in this embodiment) being longer than its radially inner length (approximately 90 cm in this embodiment) in accordance with the linear shape (curve) of the annular tunnel 13.

[0015] As shown in FIGS. 2(a) and 2(b), the propulsion box 2 of this embodiment includes main girders 21 formed in a frame shape by combining steel materials, vertical ribs 22 interposed between adjacent main girders 21 in the axial direction (the direction perpendicular to the plane of the page in FIG. 2(a)), an outer shell 23 covering the outer surfaces of the main girders 21, and support columns 24 erected within the propulsion box 2. A partition wall (fence) 25 is provided inside the propulsion box 2, dividing it into a space (transport path 61) where the material transport device 6 is installed and other spaces (such as the work passage 7 and work space). The configuration of the propulsion box 2 is not limited; for example, the support columns 24 may be provided as needed. The cross-sectional shape of the propulsion box 2 is not limited; for example, it may be circular.

[0016] The propulsion box 2 has work passages 7 on the inner surface that is radially inside and on the inner surface that is radially outside of the annular tunnel 13. That is, the propulsion box 2 has work passages 7 that run along the axial direction of the annular tunnel 13 formed along the bottom surface (the lower inner surface in FIG. 2(a)) and the ceiling surface (the upper inner surface in FIG. 2(a)). In this embodiment, the work passages 7 are formed at the end opposite the conveying path 61 and at the center in the width direction of the propulsion box 2. That is, a total of four work passages 7, 7, ... are provided inside the annular tunnel 13.

[0017] A ladder 71 is provided in the work passage 7. The ladder 71 is provided on the inner surface of the propulsion box 2 along the work passage 7 (axial direction of the circular tunnel 13). In addition, a back basket 72 is provided on the propulsion box 2 along the ladder 71 as a fall prevention member. The back basket 72 extends from the radial inside to the outside of the circular tunnel 13 and is bridged between the ladders 71 of the opposing work passages 7, 7. As shown in FIG. 2(b), in this embodiment, the back baskets 72 are provided at two locations in the axial direction of the circular tunnel 13.

[0018] 3 and 4 show a portion of the circular tunnel 13. As shown in FIGS. 3 and 4, when the propulsion boxes 2 are connected in a row, a work passage 7 with a continuous ladder 71 is formed. It is desirable to surround the work passage 7 with fall prevention chains 77 at positions where the work passage 7 is vertical (up and down) (see FIG. 4). Of the multiple propulsion boxes 2, 2, ... that make up the circular tunnel 13, some of the propulsion boxes 2 (propulsion boxes with scaffolding 20) are provided with scaffolding face plates 73. The scaffolding face plates 73 are provided so as to intersect with the work passage 7. In this embodiment, a scaffolding face plate 73 is provided at one location approximately every 5 m in the axial direction of the circular tunnel 13. In other words, in this embodiment, a propulsion box with scaffolding 20 is used for every five propulsion boxes 2.

[0019] FIG. 5 shows the scaffolding-equipped propulsion box 20. The material and shape of the scaffolding surface material 73 are not limited as long as the surface material has sufficient strength to allow people to pass through and work on it. In this embodiment, the scaffolding surface material 73 is made of expanded metal. The scaffolding surface material 73 is flat on both the front and back sides to allow people to pass through and work on it. That is, even if the scaffolding-equipped propulsion box 20 is turned upside down during construction of the circular tunnel 13, people can still pass through and work on it. As shown in FIG. 5(a), the scaffolding surface material 73 has openings formed in accordance with the positions of piping, equipment, etc. installed inside the tunnel. Furthermore, as shown in FIGS. 5(a) and 5(b), the scaffolding surface material 73 has an entrance / exit 74 formed in accordance with the work passage 7. A cover 75 is provided at the entrance / exit 74. The cover 75 slides along guide rails 76, 76 arranged on both sides of the entrance / exit 74 to open and close the entrance / exit 74. The lid 75 normally covers the entrance / exit 74, and when a person passes through, the lid 75 is slid open to open the entrance / exit 74. By making the lid 75 a sliding type, it can be opened and closed regardless of the orientation of the scaffolding surface material 73, and safety is improved. In the case of a door-type lid, the lid may open downward depending on the orientation of the scaffolding-equipped propulsion box 20, and there is a risk of contact if the door is opened while there is a person below the lid. On the other hand, a sliding type reduces the risk of contact between the lid and a person.

[0020] The following describes how the work passage 7 is used in the construction of the ring tunnel 13 (jacking tunnel) of this embodiment. Figures 6 to 11 show each construction stage. In the launch stage, in which the tunneling machine 4 is launched from the launch base (shaft 14), as shown in FIG. 6, the propulsion box 2 is assembled inside the shaft 14 behind the tunneling machine 4, and a ladder 71 and, if necessary, scaffolding surface materials 73, etc. are installed on the propulsion box 2. The ladder 71 and scaffolding surface materials 73, etc. may be attached to the propulsion box 2 in advance. At this time, movement within the circular tunnel 13 uses the work passage 7 (traffic route 70) on the radial outside of the circular tunnel 13 (lower side in FIG. 6). In other words, the lower work passage 7, which is walkable for people, is used on both sides (±30° to 40°) of the lowest point of the circular tunnel 13.

[0021] As shown in Figure 7, until the tunneling machine 4 has traveled about 1 / 4 of the total length of the circular tunnel 13 (near 0°), movement within the tunnel will use the work passage 7 on the radial outside of the circular tunnel 13. However, once the angle exceeds approximately 45° from the lowest point of the circular tunnel 13, the gradient of the work passage 7 becomes greater, so the machine will have to ascend and descend a ladder 71.

[0022] As shown in Figures 8 and 9, it is preferable to change movement (traffic route 70) inside the circular tunnel 13 from the radially outer work passage 7 of the circular tunnel 13 to the inner work passage 7 at approximately 1 / 4 (0°) of the total length of the circular tunnel 13 (the position where the work passage 7 is vertical). In this case, it is preferable to use the scaffolding surface material 73, which has become approximately horizontal, to move from the radially outer work passage 7 of the circular tunnel 13 to the inner work passage 7. In the section from 1 / 4 (0°) to 3 / 4 (180°) of the total length of the circular tunnel 13, the outer work passage 7 is in an overhanging state, so the inner work passage 7 is used.

[0023] As shown in Figures 10 and 11, it is preferable to change movement within the annular tunnel 13 (traffic route 70) from the radially inner work passage 7 of the annular tunnel 13 to the outer work passage 7 at approximately 3 / 4 (180°) of the total length of the annular tunnel 13 (the position where the work passage 7 becomes vertical). In this case, it is preferable to use the scaffolding surface material 73, which has become approximately horizontal, to move from the radially inner work passage 7 of the annular tunnel 13 to the outer work passage 7. In the section from 3 / 4 (180°) of the total length of the annular tunnel 13 to the shaft 14, the inner work passage 7 is in an overhanging state, so the outer work passage 7 is used.

[0024] According to the annular tunnel 13 (propulsion tunnel) of this embodiment, by using either the work passage 7 provided on the radially inner side or the radially outer side of the curved section, it is possible to pass through even when the orientation of the propulsion box 2 changes. In other words, in a section where using either the work passage 7 on the radially inner side or the radially outer side would require passing through in an overhanging state, it is possible to move safely by using the other work passage 7.

[0025] Since scaffolding surface materials 73 are provided at predetermined intervals, it is possible to move from one of the work passages 7 on the radially inner side or the radially outer side to the other work passage 7 using the scaffolding surface materials 73. Safety is ensured by the scaffolding surface material 73, which has a lid material 75 that covers the entrance / exit 74 to the work passage 7. In addition, the lid material 75 slides along guide rails 76 arranged on both sides of the entrance / exit 74, making it easy to open and close. Since a ladder 71 is provided along the work passage 7, there is no need to remove or install a movable ladder.

[0026] 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, an arch-shaped tunnel. The opening and closing method of the lid member 75 is not limited to the sliding type. [Explanation of symbols]

[0027] 1 Underground structure 10 Existing tunnels 11 Ramp Tunnel 12 Main Line Tunnel 13 Circular Tunnel 14 Shaft 2 Propulsion box (box) 20 Scaffolded propulsion box 21 Main girder 22 Vertical ribs 23 Outer shell 24 Posts 25 Partition Wall 3 Main push device 4 excavator 5. Center push device 6 Material handling equipment 61 Transport path 7 Work passage 70 Traffic Route 71 Ladder 72 Back Basket 73 Scaffolding surface materials 74 Entrance / Exit 75 Lid material 76 Guide rail 77 Fall prevention chain

Claims

1. A propulsion tunnel having a curved section, wherein in the process of sequentially pushing a plurality of boxes into the curved section, at least one of the boxes pushed into the curved section is turned upside down, A driving tunnel characterized in that the box has at least two working passages along the axial direction of the driving tunnel, each of which is provided on an inner surface that is radially inside the linear shape of the driving tunnel in the curved section and an inner surface that is radially outside the linear shape.

2. The tunnel according to claim 1, wherein at least one of the boxes has a scaffolding surface arranged to intersect with the work passage.

3. The propulsion tunnel according to claim 2, characterized in that the scaffolding surface material comprises a cover material that covers the entrance and exit of the work passage.

4. The propulsion tunnel according to claim 3, wherein the cover material is slidable along guide rails arranged on both sides of the entrance.

5. The propulsion tunnel according to claim 1, further comprising a ladder disposed along the working passage.

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