Segment gripping device

Abstract

To realize a device in which accidental falling off of a segment is suppressed while the operation for attaching and detaching the segment is easy.SOLUTION: A segment gripping device H that can be used for tunnel construction using a shield construction method includes an attachment 40 that is attached to a segment, and a support member 11 that has a groove portion 111 into which the attachment can be inserted. At least one end portion 111a of the groove portion 111 is open, and the attachment 40 has protrusions that protrude in the transverse direction at both longitudinal end portions. An engagement protrusion 111c is provided in the groove portion 111 at a position that engages with the protrusion when the attachment is inserted.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a segment gripping device that can be used in tunnel construction using the shield method. [Background technology]

[0002] The shield tunneling method is widely used when constructing tunnels for sewers, etc. Shield tunneling generally involves digging underground using a shield machine, and assembling segments into the excavated area to form the tunnel walls.

[0003] The equipment used in the shield tunneling method is required to perform the intended work in a limited space underground. For example, Japanese Patent Laid-Open Publication No. 4-269300 (Patent Document 1) discloses a segment assembly device that can simultaneously assemble multiple (six in this document) pre-prepared segments. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 4-269300 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Document 1 does not specifically disclose a method for attaching segments to a gripping device. However, in actual construction, the workability of tunnel construction is greatly influenced by the attachment method. Specifically, if the device allows easy attachment and detachment of segments while preventing unexpected segment detachment, it can be expected to improve workability. [Means for solving the problem]

[0006] The segment gripping device of the present invention is a segment gripping device that can be used for constructing tunnels using the shield tunneling method, and is characterized in that it comprises an attachment to be attached to a segment and a support member having a groove portion into which the attachment can be inserted, at least one end portion of the groove portion being open, the attachment having protrusions that protrude in the short direction at both longitudinal end portions, and an engaging protrusion being provided in the groove portion at a position that engages with the protrusion when the attachment is inserted.

[0007] With this configuration, the segment can be supported by the support member simply by attaching the attachment to the segment and inserting the attachment into the support member. In addition, the engagement between the protrusion and the engaging protrusion prevents the segment from accidentally falling off the support member.

[0008] Preferred embodiments of the present invention will be described below, but the scope of the present invention is not limited to the preferred embodiments described below.

[0009] In one aspect of the segment gripping device according to the present invention, the width of the groove portion in the portion where the engaging protrusion is not provided is preferably wider than the width of the portion of the attachment having the protruding portion.

[0010] With this configuration, by changing the relative positions of the support member and the attachment, it is possible to switch between an engaged state and a disengaged state. For example, by pushing the segment with a shield jack, the engagement between the support member and the attachment can be released, and the support member can be removed while leaving the segment and attachment in place on the tunnel side.

[0011] In one aspect of the segment gripping device of the present invention, the surface of the attachment that abuts against the segment when attached to the segment is preferably formed as a curved surface, and the wall surface of the groove portion is preferably formed as a curved surface that follows the curved surface of the attachment.

[0012] According to this configuration, the opening of the groove portion is narrower than the bottom portion, which further prevents the segments from accidentally falling off the support member.

[0013] In one aspect of the segment gripping device according to the present invention, the attachment preferably has a screw member that can be threadably engaged with the segment.

[0014] According to this configuration, an attachment can be attached to the segment using the through-hole originally provided in the segment for the purpose of injecting backfill material after the segment is installed.

[0015] In one aspect of the segment gripping device of the present invention, one end portion of the groove portion is open and the other end portion is closed, and it is preferable that a sensor capable of detecting the presence or absence of the attachment is provided in the closed other end portion.

[0016] According to this configuration, it is possible to detect whether or not the attachment is properly engaged with the support member.

[0017] Further features and advantages of the present invention will become more apparent from the following description of exemplary and non-limiting embodiments, which is given with reference to the drawings. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram showing the state of tunnel construction. [Figure 2] FIG. 2 is a cross-sectional view of an arc-shaped segment and a wall unit. [Figure 3] FIG. [Figure 4] FIG. 2 is a side view of the construction device according to the embodiment. [Figure 5] FIG. 2 is a side view of a lifting device and a rotation device according to an embodiment. [Figure 6]FIG. 2 is a front view of a push-up device and a rotation device according to the embodiment. [Figure 7] FIG. 2 is a top view of a support member according to the embodiment. [Figure 8] 5A and 5B are diagrams illustrating the positional relationship between a tilt lever and a contact member according to the embodiment. [Figure 9] 5A and 5B are diagrams illustrating the positional relationship between a tilt lever and a contact member according to the embodiment. [Figure 10] FIG. 2 is a side view of the supply device according to the embodiment. [Figure 11] FIG. 2 is a top view of the supply device according to the embodiment. [Figure 12] FIG. 2 is a side view of the attachment according to the embodiment. [Figure 13] FIG. 2 is a top view of the attachment according to the embodiment. [Figure 14] FIG. 2 is a front view showing the attachment according to the embodiment in use. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of a segment gripping device according to the present invention will be described with reference to the drawings. Below, an example will be described in which the segment gripping device according to the present invention is applied to a construction device 1 used in the construction of a tunnel 100. In the following example, the attachment 40, and the support member 11 and tilt lever 15 of the push-up device 10 constitute a segment gripping device H, which is one embodiment of the segment gripping device according to the present invention.

[0020] [Configuration of shield tunneling method using three-division segments] First, we will explain the general configuration of a tunnel 100 constructed using the construction device 1 according to this embodiment and the shield tunneling method used to construct the tunnel 100. This embodiment employs a shield tunneling method using three-piece segments, in which a horizontal hole excavated by a shield machine S is fixed with cylindrical wall units 102 formed by combining three arc-shaped segments 101 (hereinafter simply referred to as "segments 101") to form the tunnel 100 (Fig. 1).

[0021] The shield machine S is electrically connected to a control room R located on the ground, and excavates the natural ground into a cylindrical shape at the head of the tunnel construction alignment. Two carriages C1 and C2 are arranged behind the shield machine S, and construction devices 1 according to this embodiment are mounted separately on the carriages C1 and C2. Furthermore, segments are assembled into a cylindrical ring shape by the construction device 1 on the inner wall surface of the tunnel excavated into a cylindrical shape by the shield machine S, and the carriages C1 and C2 are configured to be able to run on tracks (not shown) laid on the segments inside the tunnel 100.

[0022] (Definition of directional terms) In the following description, the term "tunnel extension direction" may be used to refer to the direction along the extension direction of the tunnel 100. The "tunnel extension direction" of the construction device 1 and the segment 101 refers to the direction along the extension direction of the tunnel 100 when the construction device 1 and the segment 101 are in use or after installation. Similarly, the terms "tunnel inside," "tunnel outside," "tunnel radial direction," and "tunnel circumferential direction" refer to the inside, outside, radial direction, and circumferential direction based on their positional relationship with the tunnel 100 when in use or after installation. The forward / backward direction is defined according to the traveling direction of the shield machine S. In addition, when referring to the rotation direction relative to the tunnel circumferential direction, it is expressed as clockwise or counterclockwise when viewed from the front to the rear of the traveling direction of the shield machine S.

[0023] (Segment and Tunnel Configuration) Segment 101 is a reinforced concrete block with a 120-degree arc-shaped cross section (Figures 2 and 3). In this embodiment, the finished inner diameter of tunnel 100 is 1000 mm, and correspondingly, the tunnel inner surface of segment 101 is arc-shaped with a diameter of 1000 mm. The thickness of segment 101 in the tunnel radial direction is 70 mm, and the tunnel outer surface is arc-shaped with a diameter of 1140 mm. The length of segment 101 in the tunnel extension direction is 600 mm.

[0024] A protrusion 103 is provided at one end of each segment 101 in the circumferential direction of the tunnel, and a groove 104 is provided at the other end. Two segments 101 adjacent to each other in the circumferential direction of the tunnel can be connected by engaging the protrusion 103 of one segment with the groove 104 of the other segment. By connecting three segments 101 using this partial structure, a cylindrical wall unit 102 can be formed.

[0025] A protrusion 105 is provided at one end of the segment 101 in the tunnel extension direction, and a groove 106 is provided at the other end. Two wall units 102 adjacent in the tunnel extension direction can be connected by engaging the protrusion 105 (or groove 106) on a previously completed wall surface with the groove 106 (or protrusion 105) on an adjacently completed wall surface.

[0026] A sealant is injected into any connecting portion (called a joint) between the segments 101 and between the wall units 102. As such a sealant, a known material such as epoxy resin caulking can be used.

[0027] A through hole 107 is provided in the center of the segment 101 (the center in the tunnel circumferential direction and the center in the tunnel extension direction). The through hole 107 is an opening that is used as an injection port when injecting backfill material between the inner surface of the horizontal hole excavated by the shield machine S and the outer surface of the tunnel of the segment 101 after the segment 101 is installed. The through hole 107 is provided with a female thread, and after the backfill material has been injected, a cap can be screwed onto the through hole 107 to close the injection port.

[0028] [Configuration of construction device] The construction device 1 according to this embodiment includes three push-up devices 10 (first push-up device 10A, second push-up device 10B, and third push-up device 10C) that can push up segments 101, a rotation device 20 that can rotate the three push-up devices 10 in the circumferential direction of the tunnel, and a supply device 30 that can supply segments 101 to the push-up devices 10 (FIG. 4). In addition, an attachment 40 that can be connected to the push-up devices 10 and the supply device 30 is attached to the segment 101.

[0029] The three push-up devices 10 are mounted on the body portion 21 of the rotation device 20 at equal intervals in the circumferential direction. The three push-up devices 10 can be moved in the circumferential direction by the operation of the rotation device 20. In the following, the position in which the tunnel outer surface of the push-up device 10 (support member 11) is horizontal is referred to as the first position, the position moved 120° clockwise from the first position is referred to as the second position, and the position moved a further 120° clockwise from the second position (position moved 240° clockwise from the first position) is referred to as the third position.

[0030] (Configuration of the lifting device) The push-up device 10 has a support member 11 that functions as a main body supporting the segment 101, a hydraulic cylinder 12 that can supply power to move the support member 11 in the tunnel radial direction, a first connecting member 13 that connects the support member 11 to the rod 12a of the hydraulic cylinder 12, and a second connecting member 14 that connects the support member 11 to the body portion 21 of the rotation device 20 (Figures 5 to 7).

[0031] The support member 11 is a generally plate-shaped member that functions as a main body supporting the segment 101 (supporting the weight of the segment 101). A groove portion 111 is provided in the central portion of the support member 11 in the circumferential direction of the tunnel, into which the attachment 40 can be fitted. The rear end 111a of the groove portion 111 is open, and the front end 111b is closed. Engagement protrusions 111c that engage with the accommodated attachment 40 are provided on the upper surfaces (outside the tunnel) of the ends 111a and 111b of the groove portion 111. The width of the opening of the groove portion 111 is narrower than the width (circumferential direction of the tunnel) of the bottom of the groove portion 111, and the wall surface extending from the bottom to the opening is formed into a gently curved surface. The shape of this curved surface follows the curved shape of the upper surface of the attachment 40 (details of which will be described later).

[0032] When the rotation device 20 is operated to place any of the three push-up devices 10 (first push-up device 10A, second push-up device 10B, or third push-up device 10C) in the first position, the groove portion 111 of the support member 11 of the push-up device 10 in the first position and the groove portion 32 of the supply device 30 form a continuous groove. The segment 101 supplied from the supply device 30 to the push-up device 10 (support member 11) is received by the support member 11 with the attached attachment 40 entering from the end 111a of the groove portion 111. A proximity sensor is installed at the end 111b, which can detect whether the attachment 40 is fitted into a predetermined position in the groove portion 111.

[0033] A rubber roller 112 is attached to the end portion of the support member 11 in the circumferential direction of the tunnel so as to be rotatable in the front-rear direction. When the attachment 40 enters the groove portion 111, the rubber roller 112 supports the inner surface of the tunnel of the segment 101, thereby assisting the segment 101 in moving forward.

[0034] The hydraulic cylinder 12 is the driving part of the push-up device 10, and is installed so as to be able to expand and contract along the tunnel extension direction. The rod 12a of the hydraulic cylinder 12 is connected to the support member 11 via a first connecting member 13. The first connecting member 13 is divided into a first link 13a connected to the rod 12a, and a second link 13b connecting the first link 13a and the support member 11. The first link 13a and the second link 13b are fastened so as not to move relative to each other, and are journaled integrally to the body portion 21 of the rotation device 20. The end of the second link 13b on the support member 11 side is journaled on the underside of the support member 11.

[0035] When the hydraulic cylinder 12 moves backward, the portion of the first link 13a connected to the rod 12a is pulled forward, causing the first link 13a to rotate clockwise around the axis X1. In conjunction with this, the second link 13b rotates clockwise around the axis X1, causing the support member 11 to move toward the outside of the tunnel (upward). This action pushes the segment 101 supported by the support member 11 toward the outside of the tunnel (upward). Conversely, when the hydraulic cylinder 12 moves forward, the support member 11 moves toward the inside of the tunnel (downward).

[0036] The second connecting member 14 is a member that connects the support member 11 and the body portion 21 of the rotation device 20. The connecting portions at both ends are journaled and are rotatable. The second connecting member 14 operates in a dependent manner following the operation of the hydraulic cylinder 12.

[0037] Of the three boosting devices 10, the first boosting device 10A and the second boosting device 10B are provided with tilt levers 15. The tilt levers 15 are supported by the second link 13b on a common axis X2. The first boosting device 10A is provided with one tilt lever 15 (15A, 15B) on each side in the circumferential direction of the tunnel, while the second boosting device 10B is provided with a tilt lever 15 (15C) on only one side in the circumferential direction of the tunnel (FIGS. 8 and 9). The tilt levers 15 are provided on the surface opposite the surface on which the support member 11 supports the segments 101.

[0038] One tilt lever 15A of the first pushing device 10A is positioned at a position where it can come into contact with the abutment member 34 (34A) of the supply device 30 when the first pushing device 10A is in the second position (FIG. 8). The other tilt lever 15B of the first pushing device 10A is positioned at a position where it can come into contact with the abutment member 34 (34B) of the supply device 30 when the first pushing device 10A is in the third position (FIG. 9). The tilt lever 15C of the second pushing device 10B is positioned at a position where it can come into contact with the abutment member 34 (34A) of the supply device 30 when the second pushing device 10B is in the second position (FIG. 9). However, when neither tilt lever 15 is in contact with the abutment member 34, it takes a position that does not interfere with the support member 11. When the first push-up device 10A is in the third position, the second push-up device 10B is in the second position, and therefore when the tilt lever 15B abuts against the abutment member 34B, the tilt lever 15C simultaneously abuts against the abutment member 34A.

[0039] When the tilt lever 15 abuts against the abutment member 34, the tilt lever 15 rotates clockwise around the axis X2. At this time, one end 151 of the tilt lever 15 on the support member 11 side pushes the support member 11 toward the outside of the tunnel. This action occurs only on the left-right side of the support member 11 where the tilt lever is provided, so only one side of the support member 11 is pushed toward the outside of the tunnel. This causes the support member 11 to tilt relative to the radial direction of the tunnel. More specifically, the upper portion of the segment 101A in the second posture is pushed toward the outside of the tunnel and retracted, widening the space above the segment 101A toward the inside of the tunnel, creating room for another segment 101B supplied from the supply device 30 to pass through (FIG. 8). Furthermore, because the space above the segment 101A toward the inside of the tunnel is widened, the segments 101A and 101B do not interfere with each other when the other segment 101B is pushed toward the outside of the tunnel (upward). In the following explanation, this series of operations will be referred to as the “tilt mechanism.” When inserting the third segment 101C, the tilt mechanism is similarly activated to move one side of the previously inserted segments 101A and 101B aside to create space for the third segment 101C to pass through and rise (FIG. 9).

[0040] The support member 11 is configured to assume a position that is approximately perpendicular to the tunnel radial direction when one end 151 of the tilt lever 15 is not in contact with it. Specifically, two springs (not shown) are provided that bias the support member 11 from both sides in the tunnel circumferential direction, and the balance of the elastic forces of the two springs maintains the support member 11 in a position that is approximately perpendicular to the tunnel radial direction. When the tilt lever 15 presses one side of the support member 11, stress is applied against the balance of the two springs.

[0041] In addition, an adjustment cylinder 16 is provided that can operate the three lifting devices 10 in conjunction with each other, and the adjustment cylinder 16 is connected to the cylinder heads 12b of the three hydraulic cylinders 12. When the adjustment cylinder 16 extends, the three hydraulic cylinders 12 move forward. In relation to the support members 11, the forward movement of the hydraulic cylinders 12 is equivalent to the hydraulic cylinders 12 retracting. Therefore, when the adjustment cylinder 16 extends, the support members 11 move toward the outside of the tunnel. However, unlike the movement of a single hydraulic cylinder 12, when the adjustment cylinder 16 extends, the three hydraulic cylinders 12 move simultaneously, and the three support members 11 move simultaneously. In other words, the operation of the three lifting devices 10 is synchronized. This allows the positions of the three segments 101 to be fine-tuned simultaneously.

[0042] (Configuration of the rotating device) The rotation device 20 has a body portion 21 that supports the three push-up devices 10, and a hydraulic motor that can rotate the body portion 21 in the circumferential direction of the tunnel. By operating the hydraulic motor to rotate the body portion 21, the circumferential positions of the three push-up devices 10 can be changed, and in particular, the three push-up devices 10 can be positioned in any of a first position, a second position, and a third position.

[0043] (Supply device configuration) The supply device 30 has a main body portion 31, a groove portion 32 provided on the upper surface of the main body portion 31, a pair of left and right guide arms 33 (33A, 33B) configured to be able to extend forward from the main body portion 31, abutment members 34 (34A, 34B) attached to the guide arms 33, and stopper members 35 (35A, 35B) attached to the guide arms 33.

[0044] A groove portion 32 is provided in the center portion of the main body portion 31 in the circumferential direction of the tunnel. The groove portion 32 is configured in a shape that allows the attachment 40 to be fitted therein. The segment 101 is supported by the supply device 30 in a manner that the attached attachment 40 is housed in the groove portion 32.

[0045] A rubber roller 311 is attached to the end portion of the main body portion 31 in the circumferential direction of the tunnel so as to be rotatable in the front-rear direction. The rubber roller 311 supports the inner surface of the tunnel of the segment 101 in rotation when the attachment 40 moves in the front-rear direction in the groove portion 32, thereby assisting the front-rear movement of the segment 101.

[0046] The guide arm 33 is a member that serves to push the segment 101 from the tip portion of the main body portion 31 into the push-up device 10 (support member 11) in the first position. When the push-up device 10 is in the first position, the groove portion 111 of the support member 11 of the push-up device 10 and the groove portion 32 of the supply device 30 form a continuous groove, allowing the attachment 40 to move continuously from the groove portion 32 to the groove portion 111. When the guide arm 33 is extended forward from the main body portion 31, the stopper member 35 abuts against the segment 101, pushing the segment 101 forward. At this time, when the segment 101 is pushed by the guide arm 33, the attachment 40 is accommodated in the groove portion 111, and the segment 101 is supported by the push-up device 10. In this way, the operation of the guide arm 33 allows the segment 101 to be supplied from the supply device 30 to the push-up device 10.

[0047] The abutment member 34 is a member fixed to the guide arm 33 and extends outward from the guide arm 33 (in a direction away from the main body portion 31). When the guide arm 33 is extended forward from the main body portion 31, the abutment member 34 abuts against the tilt lever 15, causing the tilt lever 15 to rotate about the axis X2. As described above, the support member 11 tilts when the tilt lever 15 rotates. Therefore, the tilt mechanism operates in conjunction with the operation of the guide arm 33 extending forward from the main body portion 31. This makes it possible, for example, to tilt the support member 11 of the first push-up device 10A in conjunction with the operation of supplying the segment 101 to the second push-up device 10B, thereby creating space for the segment 101 to enter and rise. Similarly, in conjunction with the operation of supplying the segment 101 to the third push-up device 10C, the support members 11 of the first push-up device 10A and the second push-up device 10B can be tilted to create space for the segment 101 to enter and rise.

[0048] The stopper member 35 is a member fixed to the guide arm 33, and when not subjected to stress, takes a position in which it extends diagonally upward from the guide arm 33. The stopper member 35 is configured to maintain a position in which it extends diagonally upward from the guide arm 33 (upright position) when subjected to stress from the front to the rear, and to take a tilted position (tilted position) when subjected to stress from the rear to the front.

[0049] When the guide arm 33 is extended forward from the main body 31, the stopper member 35 comes into contact with the rear portion of the segment 101. At this time, the stopper member 35 receives a stress from the segment 101 that is directed from the front to the rear, so that the upright position is maintained. As a result, the segment 101 is pushed by the stopper member 35 and moves forward together with the guide arm 33.

[0050] On the other hand, when an attempt is made to move the segment 101, which is located behind the stopper member 35, to a position in front of the stopper member 35, the stopper member 35 comes into contact with the front portion of the segment 101. At this time, the stopper member 35 receives a stress from the rear to the front from the segment 101, and is changed to a tilted position. As a result, the stopper member 35 does not hinder the forward movement of the segment 101.

[0051] (Attachment configuration) The attachment 40 has a main body portion 41 and a threaded portion 42 (FIGS. 12 to 14). The threaded portion 42 has a male thread formed therein that can be threadedly engaged with a female thread formed in the through-hole 107 of the segment 101. The attachment 40 can be attached to the segment 101 by threading the male thread of the threaded portion 42 into the female thread of the through-hole 107.

[0052] The upper surface of the main body portion 41 is formed in a curved shape (FIG. 14). Protruding portions 43 that protrude in the circumferential direction of the tunnel are provided at both ends of the main body portion 41 in the front-to-rear direction, and a retracting portion 44 that is retracted in the circumferential direction compared to the protruding portions 43 is provided at the center portion of the main body portion 41 in the front-to-rear direction. When the attachment 40 is accommodated in the groove portion 111 of the support member 11 of the push-up device 10, the engaging protrusions 111c of the groove portion 111 and the protruding portions 43 are aligned, thereby preventing the attachment 40 from falling out of the groove portion 111.

[0053] After combining the three segments 101 to form the wall unit 102, a shield jack (not shown) provided on the shield machine S is operated to push the wall unit 102 rearward. At this time, the attachment 40 moves rearward relative to the support member 11, causing a misalignment of the protrusion 43 of the attachment 40 and the engaging protrusion 111c of the support member 11. Because the width of the groove portion 111 in the portion where the engaging protrusion 111c is not provided is wider than the width of the portion where the protrusion 43 of the attachment 40 is provided, in this state the attachment 40 can be detached from the support member 11 (push-up device 10).

[0054] [Configuration of construction method] Next, a description will be given of a construction method for a tunnel 100 carried out using the construction device 1 according to this embodiment. Prior to construction, three segments 101 (101A, 101B, 101C) are supported by the supply device 30, and an attachment 40 is attached to each segment 101. The three boosting devices 10 are also aligned so that the first boosting device 10A is in a first position, the second boosting device 10B is in a third position, and the third boosting device 10C is in a second position.

[0055] First, the first segment 101A is supplied to the first boosting device 10A. After that, the hydraulic cylinder 12 of the first boosting device 10A is retracted to move the segment 101A toward the outside of the tunnel. Next, the rotation device 20 is operated to change the position of the first boosting device 10A from the first position to the second position, and the first boosting device 10A and the first segment 101A are retracted. At this time, the second boosting device 10B changes its position to the first position.

[0056] Second, the second segment 101B is supplied to the second lifting device 10B. At this time, the guide arm 33 advances, and the abutment member 34A abuts the tilt lever 15A, activating the tilt mechanism (FIG. 8). This moves the upper portion of the segment 101A out of the path of the segment 101B, creating space for the segment 101B supplied from the supply device 30 to pass and rise. The hydraulic cylinder 12 of the second lifting device 10B is then retracted to move the segment 101B toward the outside of the tunnel. The adjustment cylinder 16 is then extended or retracted to simultaneously move the segments 101A and 101B, fine-tuning their relative positions. The rotation device 20 is then operated to change the position of the second lifting device 10B from the first position to the second position, retracting the second lifting device 10B and the second segment 101B. At this time, the third push-up device 10C changes its position to the first position, and the first push-up device 10A changes its position to the third position.

[0057] Third, the third segment 101C is supplied to the third push-up device 10C. At this time, the guide arm 33 moves forward, and the abutment members 34A and 34B abut against the tilt levers 15C and 15B, respectively, activating the tilt mechanism (FIG. 9). This moves the upper portions of the segments 101A and 101B out of the path of the segment 101C, creating space for the segment 101C supplied from the supply device 30 to pass through and rise. Thereafter, the hydraulic cylinder 12 of the third push-up device 10C is retracted, and the segment 101C is moved toward the outside of the tunnel.

[0058] Fourth, the adjustment cylinder 16 is extended or retracted to simultaneously move the segments 101A, 101B, and 101C, moving them radially in the tunnel. This movement causes the protrusions 103 and grooves 104 to engage, connecting the segments 101. This operation completes the cylindrical wall unit 102. This wall unit 102 is completed at a position forward of the existing wall unit 102, and there is a gap between the wall unit 102 and the existing wall unit 102 immediately after completion.

[0059] Fifth, a shield jack (not shown) provided on the shield machine S is operated to push the just-completed wall surface unit 102 rearward, and the just-completed wall surface unit 102 is brought into contact with the existing wall surface unit 102. In other words, there is no gap between the just-completed wall surface unit 102 and the existing wall surface unit 102. At this time, as the just-completed wall surface unit 102 moves rearward, the attachment 40 moves rearward relative to the support member 11, and the positions of the protrusion 43 of the attachment 40 and the engaging protrusion 111c of the support member 11 are misaligned.

[0060] Finally, all three hydraulic cylinders 12 of the push-up devices 10 are extended, moving the three support members 11 toward the tunnel interior. When the hydraulic cylinders 12 are extended, the second link 13b rotates around the axis X1, causing the support member 11 to move along an arc. At this point, the protrusion 43 and the engaging projection 111c are no longer aligned as described above, allowing the engaging projection 111c of the support member 11 to pass through the retraction portion 44 of the attachment 40. This action disengages the attachment 40 from the support member 11, leaving the wall unit 102 and the three attachments 40 on the tunnel 100 side. The attachment 40 is then removed from the wall unit 102, and backfill material is injected through the through-hole 107. The subsequent steps are similar to those of conventional shield tunneling, so a detailed description is omitted.

[0061] Other Embodiments Finally, other embodiments of the segment gripping device according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments, as long as no contradiction occurs.

[0062] In the above embodiment, an example has been described in which the segment gripping device H is implemented as part of the construction device 1. However, the application of the segment gripping device according to the present invention is not limited to the construction device 1 in the above embodiment. In other words, the segment gripping device according to the present invention can be applied to a variety of devices that need to grip segments, regardless of various conditions such as the structural conditions of the segments themselves (mass, material, shape, dimensions, etc.) and the construction conditions of the segments (number of segments that need to be constructed, ring configuration, joint method, etc.).

[0063] In the above embodiment, the tilt lever 15 is provided on the support member 11, and a tilt mechanism is mounted thereon. However, the segment gripping device according to the present invention may or may not have a tilt mechanism.

[0064] In the above embodiment, an example was described in which the width of the groove portion 111 in the portion where the engaging protrusion 111c is not provided is wider than the width of the portion where the protrusion 43 of the attachment 40 is provided. However, in the segment gripping device of the present invention, the dimensional relationship between the groove portion of the support member and the attachment is arbitrary as long as the engaging protrusion of the groove portion and the protrusion of the attachment can be engaged.

[0065] In the above embodiment, an example was described in which the upper surface of the attachment has a curved shape, but the shape of the attachment in the segment gripping device of the present invention is arbitrary as long as it can be inserted into the groove portion and has a protrusion that can engage with the engaging protrusion of the groove portion.

[0066] In the above embodiment, an example has been described in which the attachment 40 is attached to the segment 101 by utilizing the through-hole 107 of the segment 101. However, in the gripping device according to the present invention, the method of attaching the attachment to the segment is arbitrary.

[0067] In the above embodiment, a configuration in which a proximity sensor is provided at the end 111b of the groove portion 111 has been described as an example, but the presence or absence of a sensor is optional in the gripping device according to the present invention.

[0068] Regarding other configurations, it should be understood that the embodiments disclosed in this specification are illustrative in all respects and that the scope of the present invention is not limited thereby. Those skilled in the art will easily understand that appropriate modifications are possible without departing from the spirit of the present invention. Therefore, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention. [Industrial Applicability]

[0069] The present invention can be used, for example, in the construction of tunnels using the shield method. [Explanation of symbols]

[0070] 1: Construction equipment 10: Push-up device 11: Support member 111:Groove part 111a: End of groove portion (rear side) 111b: End of groove portion (front side) 111c: Engagement protrusion 112: Rubber roller 12: Hydraulic cylinder 12a: Rod 12b: Cylinder head 13: First connecting member 13a: First link 13b: Second link 14: Second connecting member 15: Tilt lever 151: One end of tilt lever 16: Adjusting cylinder X1 :Axis X2 :axis 20: Rotating device 21: Body part 30: Feeding device 31: Main body part 311: Rubber roller 33: Guide arm 34: Contact member 35: Stopper member 40: Attachment 41: Main body part 42: Screw part 43:Protruding part 44: Retirement Department H: Segment gripping device 100: Tunnel 101: Arc segment (segment) 102: Wall unit 103: Protrusion (circumferential direction of tunnel) 104: Groove (circumferential direction of tunnel) 105: Protrusion (tunnel extension direction) 106: Groove (tunnel extension direction) 107: Through hole S: Shield machine C1: Cart C2: Cart R: Control room

Claims

1. A segment gripping device that can be used for tunnel construction using the shield method, an attachment attached to the segment; a support member having a groove portion into which the attachment can be inserted, At least one end portion of the groove portion is open, The attachment has protrusions protruding in the short direction at both ends in the longitudinal direction, A segment gripping device in which an engagement protrusion is provided in the groove portion at a position that engages with the protrusion when the attachment is inserted.

2. 2. The segment gripping device according to claim 1, wherein the width of the groove portion in the portion where the engaging projection is not provided is wider than the width of the portion of the attachment where the protrusion is provided.

3. A surface of the attachment that contacts the segment when attached to the segment is formed as a curved surface, 3. The segment gripping device according to claim 1, wherein the wall surface of the groove portion is formed as a curved surface that follows the curved surface of the attachment.

4. 3. The segment gripping device according to claim 1, wherein the attachment has a screw member that can be threadedly engaged with the segment.

5. One end portion of the groove portion is open and the other end portion is closed, 3. The segment gripping device according to claim 1, wherein a sensor capable of detecting the presence or absence of the attachment is provided at the closed other end portion.

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