Shield tunneling machine

Abstract

To provide a shield tunneling machine that allows for easy transport, installation, and removal of expansion / contraction force transmission members and spacers. [Solution] The erector 11 is equipped with a retaining attachment 40 capable of holding the expansion / contraction force transmission member 18 and the spacer 18a, which can be selectively attached to the segment retaining jig 11a. The erector 11, with the expansion / contraction force transmission member 18 or the spacer 18a held by the retaining attachment 40, is used to transport and install the expansion / contraction force transmission member 18 or the spacer 18a to a predetermined installation location, or to remove it from a predetermined installation location.

Description

Technical Field

[0001] The present invention relates to a shield tunneling machine.

Background Art

[0002] A shield tunneling machine is known as a device used for excavating a shield tunnel such as a tunnel or a subway by excavating the ground.

[0003] In this shield tunneling machine, a cutter head is rotatably installed at the tip of the skin plate in the advancing direction, and a plurality of bits are arranged on the cutter head in a circumferential and radial manner. Then, by pressing the cutter head against the excavation face (face) and rotating it while advancing, the ground is excavated in a circular shape. At this time, inside the shield tunneling machine, segments are assembled in a cylindrical shape, and the shield tunneling machine advances while excavating by taking the reaction force on these segments.

[0004] When constructing a curved section of a shield tunnel using such a shield tunneling machine, the shield tunneling machine is bent by a mid-break jack to bend the shield tunneling machine according to the curve.

[0005] In the construction of shield tunnels, the length is increasing (generally, a length of 1.5 km or more is called a long distance, and a length of 3.0 km or more is called an ultra-long distance). Depending on the construction site, sharp curve excavation may be required.

[0006] With the increase in the length of such shield tunnels, deterioration and damage of the tail seal (such as deformation of the seal member itself, removal or deformation of the wire brush, etc.) occur, resulting in various troubles such as defects in the segments and abnormal increase in thrust. During excavation, it becomes necessary to replace the tail seal.

[0007] Furthermore, if the length of the shield tunneling machine is long, it may be difficult to follow the required sharp curve or the overexcavation may increase.

[0008] To improve the ability to follow curves during construction and as a means of replacing the tail seal, the technology described in Patent Document 1 has been proposed.

[0009] The technology described in Patent Document 1 is a technology that makes the overall length of the rear body variable by configuring the rear body, which is installed after the front body on which the cutter head is installed, with a rear body inner cylinder located on the front body side and a rear body outer cylinder installed after the rear body inner cylinder so as to partially overlap with the rear body inner cylinder and be movable in the axial direction, so as to shorten the length of the rear body when working on curves to improve followability and to allow the tail seal to be replaced. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2024-136038 [Overview of the project] [Problems that the invention aims to solve]

[0011] Now, as described in Patent Document 1, in order to implement this technology, it is necessary to transport and install the expansion / contraction force transmission member for fixing the shield jack spreader to the outer cylinder portion of the rear body, and the spacer interposed between the expansion / contraction force transmission member and the end face of the segment, to a predetermined installation location, and then to remove them from the predetermined installation location.

[0012] However, because the expansion and contraction force transmission members and spacers are made of steel, they are heavy objects (the weight varies depending on the size and cannot be stated definitively, but to give an example, the expansion and contraction force transmission members weigh about 30-40 kg each, and the spacers weigh about 35-45 kg each), making it difficult for workers to carry, install, and remove them inside a shield tunneling machine surrounded by various other equipment.

[0013] The present invention has been made in light of the above-mentioned technical background, and aims to provide a technology that allows for easy transportation and installation of an expansion / contraction force transmission member and a spacer to a predetermined installation location, and easy removal from the predetermined installation location. [Means for solving the problem]

[0014] To solve the above problems, the shield tunneling machine of the present invention as described in claim 1 is a shield tunneling machine that excavates underground and advances while assembling segments to the rear, comprising: a front section on which a cutter head is installed; a rear section having an inner cylinder portion on which a plurality of shield jacks, each with a spreader attached to its tip, are provided with the spreaders facing to the rear; and a rear section having an outer cylinder portion that follows the inner cylinder portion on which the outer cylinder portion partially overlaps and is movable in the axial direction of the excavation hole, wherein the outer cylinder portion on the inner circumferential surface An annular first fixing member groove, a second fixing member groove, and a transmission member groove are formed around the entire circumference from front to rear, respectively; a fixing member that detachably engages with the first fixing member groove to fix the rear outer cylinder portion to the rear inner cylinder portion in a first state where the length of the rear body is relatively longer, and detachably engages with the second fixing member groove to fix the rear outer cylinder portion to the rear inner cylinder portion in a second state where the length of the rear body is relatively shorter; and a fixing member that detachably engages with the transmission member groove to fix the shield jack The device is provided with an expandable / contractable force transmission member that fixes the spreader to the outer cylinder portion of the rear body, and a spacer that is attached to the segment side of the expandable / contractable force transmission member that is pushed by the shield jack, and interposed between the expandable / contractable force transmission member and the end face of a segment that is provided on the rear end side of the main body of the device and forms a tunnel. The inner cylinder portion of the rear body is provided with an erector that is attached to an intermediate ring body provided along the inner circumferential surface of the inner cylinder portion of the rear body, and is rotatable along the circumferential direction of the inner cylinder portion of the rear body, and holds a segment with a detachably attached segment holding jig, rotates in the circumferential direction of the inner cylinder portion of the rear body, and transports the segment to an assembly position in the inner circumferential direction of the inner cylinder portion of the rear body. The erector is provided with a holding attachment that can hold the expandable / contractable force transmission member and the spacer, which can be selectively attached to the segment holding jig. The erector, which holds the expandable / contractable force transmission member or the spacer with the holding attachment, is used to transport and install the expandable / contractable force transmission member or the spacer to a predetermined installation location, or to remove it from a predetermined installation location.

[0015] The shield tunneling machine of the present invention as described in claim 2 is characterized in that, in the invention described in claim 1, the expansion and contraction force transmission member is made of steel material consisting of a main body having one side of a box-shaped cube as an opening, and a partition wall that divides the inside of the main body by being spanned across two sides adjacent to and facing each other from the opening, the partition wall is arranged along the axial direction of the rear body and the opening faces the radial center of the rear body, the spacer is made of steel material consisting of a main body made of a plurality of cylindrical steel pipes arranged in parallel, end plates attached to both ends of the main body, and a base plate attached along the steel pipes of the main body, the end plates are arranged facing each other in the axial direction of the rear body and the base plate faces the center of the rear body, and the holding attachment is characterized in that a first attachment that holds the expansion and contraction force transmission member by screwing the partition wall from both sides, and a second attachment that holds the spacer by screwing it in surface contact with the surface of the base plate.

[0016] The shield tunneling machine of the present invention as described in claim 3 is characterized in that, in the invention described in claim 2, the expansion and contraction force transmission member is such that the partition wall is screwed to the first attachment with bolts and nuts, and the spacer is such that the base plate is screwed to the second attachment with tapped screws.

[0017] The shield tunneling machine of the present invention as described in claim 4 is characterized in that, in the invention described in claim 1, the rear outer cylinder portion is further provided with a buckling prevention member interposed between the shield jack and the segment after the shield jacks other than the shield jack pressed against the segment have been extended for a predetermined length when replacing the tail seal arranged along the inner circumferential surface of the rear inner cylinder portion in the second state, the holding attachment is further capable of holding the buckling prevention member, and the buckling prevention member is transported to and installed at a predetermined installation location or removed from a predetermined installation location by the erector holding the buckling prevention member with the holding attachment.

[0018] The shield tunneling machine of the present invention as described in claim 5 is characterized in that, in the invention described in claim 4, the buckling prevention member is made of steel material consisting of a main body made of H-shaped steel and two end plates attached to both ends of the main body, the end plates face each other in the axial direction of the rear body, and one flange constituting the main body is positioned facing the radial center of the rear body, and the holding attachment is a second attachment that holds the buckling prevention member by screwing it in surface contact with the surface of the flange and is the same as the attachment that holds the spacer.

[0019] The shield tunneling machine of the present invention as described in claim 6 is characterized in that, in the invention described in claim 5, the buckling prevention member is such that the flange is screwed to the second attachment with bolts and nuts. [Effects of the Invention]

[0020] According to the present invention, the expansion and contraction force transmission member and spacer are attached to the erector using a holding attachment, and the expansion and contraction force transmission member and spacer are suspended and held by the erector using the holding attachment, and are then transported to and installed at a predetermined installation location by the erector, or removed from the predetermined installation location. This makes it possible to easily transport and install the expansion and contraction force transmission member and spacer at a predetermined installation location, and to easily remove them from the predetermined installation location. [Brief explanation of the drawing]

[0021] [Figure 1] This is a diagram showing the main components of a shield tunneling machine, one embodiment of the present invention, viewed from the side. [Figure 2] Figure 1 is a diagram showing the main components of the rear casing plate of a shield tunneling machine, viewed from the side. [Figure 3] This is a perspective view showing the segment used in this embodiment. [Figure 4]It is a view of an erector holding the segments of FIG. 3 and the assembled segments in a ring shape as seen from the tunnel axis direction. [Figure 5] (a) is a front view showing a segment holding jig attached to an erector, and (b) is a side view of the segment holding jig of (a). [Figure 6] It is a side view of a mounting pin for detachably attaching a segment holding jig to an erector. [Figure 7] It is a cross-sectional view showing the shield tunneling machine of FIG. 1 along line A of FIG. 2. [Figure 8] It is a view showing an extracted part of FIG. 7. [Figure 9] It is a cross-sectional view showing the shield tunneling machine of FIG. 1 along line B of FIG. 2. [Figure 10] It is a plan view showing a spreader and its peripheral mechanism in the shield tunneling machine of FIG. 1. [Figure 11] It is a plan view showing a spreader and its peripheral mechanism in a shield tunneling machine as a comparative example. [Figure 12] It is a plan view showing the development of a half circumference of the inner peripheral surface of the rear body outer cylinder part in the shield tunneling machine according to an embodiment of the present invention. [Figure 13] It is a plan view showing the development of the axial direction of the rear body outer cylinder part along line C of FIG. 9. [Figure 14] It is a plan view showing the development of the axial direction of the rear body outer cylinder part along line D of FIG. 9. [Figure 15] It is a plan view showing the development of the axial direction of the rear body outer cylinder part along line E of FIG. 9. [Figure 16] It is a figure showing one process in the contraction operation of the rear body plate of the shield tunneling machine of Example 1, (a) is a conceptual diagram shown from a plane, and (b) is an explanatory diagram shown from the side. [Figure 17] It is a figure showing the process following FIG. 16 in the contraction operation of the rear body plate of the shield tunneling machine of Example 1, (a) is a conceptual diagram shown from a plane, and (b) is an explanatory diagram shown from the side. [Figure 18]This figure shows the process following Figure 17 during the contraction operation of the rear plate of the shield tunneling machine in Example 1, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 19] This figure shows the process following Figure 18 during the contraction operation of the rear casing plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 20] This figure shows the process following Figure 19 during the contraction operation of the rear casing plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 21] This figure shows the process following Figure 20 during the contraction operation of the rear plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 22] This figure shows the process following Figure 21 during the contraction operation of the rear casing plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 23] This figure shows the process following Figure 22 during the contraction operation of the rear casing plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 24] This figure shows one process in the extension operation of the rear plate of the shield tunneling machine in Example 1, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 25] This figure shows the process following Figure 24 during the extension operation of the rear casing plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 26] This figure shows the process following Figure 25 during the extension operation of the rear casing plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 27]This figure shows the process following Figure 26 during the extension operation of the rear casing plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 28] This figure shows the process following Figure 27 during the extension operation of the rear casing plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 29] This figure shows the process following Figure 28 during the extension operation of the rear casing plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 30] This figure shows the process following Figure 29 during the extension operation of the rear casing plate of the shield tunneling machine in Example 1, with (a) being a conceptual diagram shown from above and (b) being an explanatory diagram shown from the side. [Figure 31] (a) is a plan view of the expansion and contraction force transmission member in this embodiment, (b) is a cross-sectional view along line AA in (a), and (c) is a cross-sectional view along line BB in (a). [Figure 32] (a) is a plan view of the spacer in this embodiment, (b) is a cross-sectional view of (a) along line CC, and (c) is a cross-sectional view of (a) along line DD. [Figure 33] (a) is a front view of the first attachment in this embodiment, and (b) is a side view of the first attachment in (a). [Figure 34] (a) is a front view of the second attachment, (b) is a side view of the second attachment shown in (a), and (c) is a top view of the second attachment shown in (a). [Figure 35] (a) is a plan view of the stretchable force transmission member to which the first attachment in this embodiment is attached, (b) is a cross-sectional view along the EE line of (a), and (c) is a cross-sectional view along the FF line of (a). [Figure 36] This is a front view showing the expansion / contraction force transmission member being held by the erector by the first attachment. [Figure 37](a) is a plan view of the spacer in this embodiment, (b) is a cross-sectional view of (a) along the GG line, and (c) is a cross-sectional view of (a) along the HH line. [Figure 38] This is a front view showing the spacer being held in place by the second attachment on the erector. [Figure 39] This figure shows one process of the tail seal replacement procedure in the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 40] This diagram shows the process following Figure 39 in the tail seal replacement procedure for the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 41] This diagram shows the process following Figure 40 in the tail seal replacement procedure for the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 42] This diagram shows the process following Figure 41 in the tail seal replacement procedure for the shield tunneling machine in Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 43] This diagram shows the process following Figure 42 in the tail seal replacement procedure for the shield tunneling machine in Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 44] This diagram shows the process following Figure 43 in the tail seal replacement procedure for the shield tunneling machine in Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 45] This diagram shows the process following Figure 44 in the tail seal replacement procedure for the shield tunneling machine in Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 46] This diagram shows the process following Figure 45 in the tail seal replacement procedure for the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 47]This diagram shows the process following Figure 46 in the tail seal replacement procedure for the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 48] This diagram shows the process following Figure 47 in the tail seal replacement procedure for the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 49] This diagram shows the process following Figure 48 in the tail seal replacement procedure for the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 50] This diagram shows the process following Figure 49 in the tail seal replacement procedure for the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 51] This diagram shows the process following Figure 50 in the tail seal replacement procedure for the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 52] This diagram shows the process following Figure 51 in the tail seal replacement procedure for the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 53] This diagram shows the process following Figure 52 in the tail seal replacement procedure for the shield tunneling machine of Example 2, where (a) is a conceptual diagram shown from above and (b) is an explanatory diagram shown from the side. [Figure 54] (a) is a plan view of the buckling prevention member in this embodiment, (b) is a cross-sectional view along line II in (a), and (c) is a cross-sectional view along line JJ in (a). [Figure 55] This is a cross-sectional view from the rear of the shield tunneling machine shown in Figure 1, showing a buckling prevention member, which is one embodiment of the present invention, attached to the machine. [Figure 56] (a) is a plan view of the buckling prevention member in this embodiment, (b) is a cross-sectional view of (a) along line KK, and (c) is a cross-sectional view of (a) along line LL. [Figure 57] This is a front view showing the buckling prevention member being held by the erector by the second attachment. [Modes for carrying out the invention]

[0022] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings used to illustrate the embodiments, the same reference numerals are generally used for identical components, and repeated descriptions of such components will be omitted.

[0023] First, the overall configuration of the shield tunneling machine of this embodiment will be described with reference to Figure 1. Figure 1 is a diagram showing the main components of the shield tunneling machine of this embodiment, viewed from the side.

[0024] The shield tunneling machine 1 of this embodiment is a mud pressure shield tunneling machine that excavates while ensuring the stability of the tunnel face by generating mud pressure to counteract the earth pressure at the tunnel face, by filling the chamber 4 between the cutter head 2 and the machine body 3 with mud that has impermeability and plastic fluidity (the property of being able to be freely deformed and moved), which is generated by injecting additives into the soil excavated by the cutter head 2 and mixing it, for example, and then excavating while generating mud pressure to counteract the earth pressure at the tunnel face.

[0025] The cutter head 2 is a shield cutter machine for excavating the ground, and is installed on the front of the tip of the shield tunneling machine 1 in a manner that allows it to rotate in both forward and reverse directions along the circumferential direction of the main body of the machine 3.

[0026] The front surface of this cutter head 2 (the surface facing the cutting face) is fitted with a center bit CB, a bit B, and a scraper tooth (not shown), etc. The center bit CB and bit B are mainly excavation parts for breaking up the ground, and the scraper tooth is mainly a cutting part for cutting the ground. Note that a roller cutter, for example, may be fitted in place of bit B.

[0027] Furthermore, a copy cutter CC is installed on the outer circumference of the cutter head 2. The copy cutter CC is responsible for over-excavation during curved construction and for controlling the attitude of the shield tunneling machine 1. In addition, multiple stirring rods SB are attached to the central area on the underside of the cutter head 2. The stirring rods SB are formed, for example, from cylindrical protruding members, and are responsible for stirring and mixing the soil and additives in the chamber 4 as the cutter head 2 rotates.

[0028] The main body of the equipment 3 is the main component that drives the shield tunneling machine 1. The equipment that drives the shield tunneling machine 1 is surrounded and protected by the skin plate 5 that forms the outer shell of the main body of the equipment 3. The skin plate 5 has a front body plate (front section) 5a and a rear body plate (rear section) 5b behind it. The front body plate 5a and the rear body plate 5b are made of, for example, cylindrical steel plates, and are engaged by the spherical bearing portion at the tip of the rear body plate 5b fitting into contact with the inner circumferential surface of the front body plate 5a.

[0029] The rear fuselage plate 5b consists of a rear inner cylinder portion 5ba located on the front fuselage plate 5a side, and a rear outer cylinder portion 5bb installed following the rear inner cylinder portion 5ba. The detailed structure of the rear fuselage plate 5b will be described later.

[0030] The hollow space within the skin plate 5 is divided into a face side and a machine side by a bulkhead 7 provided inside the front drum plate 5a. The chamber 4 described above is provided on the face side of the bulkhead 7 (i.e., between the cutter head 2 and the bulkhead 7). Excavated soil and other materials by the cutter head 2 are taken into the chamber 4 through a soil intake opening (not shown) that penetrates the front underside of the cutter head 2.

[0031] Meanwhile, inside the hollow space of the skin plate 5, the cutter drive unit 8, folding jack 9a, shield jack 9b, screw conveyor 10, erector 11, and tail seals 12Ba, 12Bb are installed. In addition, a spreader 15 for transmitting the thrust of the shield jack 9b to a wide area of ​​the segment SG (described later) is attached to the tip of the rod 9ba that constitutes the shield jack 9b via a block 9bb that aligns the position of the rod 9ba of the shield jack 9b with the position of the segment SG. Although not shown in the figures, the main body of the machine 3 is also equipped with various other devices, such as an earth pressure detection unit for detecting the earth pressure in the chamber 4, and an additive injection unit for injecting the additive material (earth-forming material) into the front of the cutter head 2 and inside the chamber 4.

[0032] The cutter drive unit 8 is a motor (drive source) that rotates the cutter head 2 in forward and reverse directions, and multiple units are installed in a row along the circumferential direction of the cutter head 2, near the outer circumference on the front surface of the cutter head 2. In this example, an outer circumference support drive system is used as the cutter drive system.

[0033] The folding jacks 9a are devices used to correct the direction and attitude of the shield tunneling machine 1. Multiple folding jacks 9a are installed in a row along the circumferential direction of the machine body 3, straddling the boundary between the front plate 5a and the rear plate 5b, so as to connect the front plate 5a and the rear plate 5b within the machine body 3. By supplying pressurized oil to these folding jacks 9a and advancing the shield tunneling machine 1 while the front plate 5a and the rear plate 5b are bent in a predetermined direction and angle, it is possible to control the direction and attitude of the shield tunneling machine 1.

[0034] The shield jacks 9b are devices that generate thrust to advance the shield tunneling machine 1 by taking reaction force from the segment SG installed at the rear of the main body 3, and are installed in the inner cylindrical section 5ba of the rear body which constitutes the rear body plate 5b. Multiple shield jacks 9b are installed in a row along the circumferential direction of the main body 3.

[0035] The screw conveyor 10 is a device for discharging soil and sand taken into the chamber 4 to the outside of the machine. It is installed to extend continuously diagonally upward towards the rear, penetrating the bulkhead 7 from the chamber 4. A ribbon screw conveyor is shown as an example here.

[0036] The erector 11 is an assembly device that holds the segment SG and rotates it in the circumferential direction of the rear cylinder inner section 5ba, and transports it to the assembly position in the inner circumferential direction of the rear cylinder inner section 5ba. It is attached to an intermediate ring body 16 provided along the inner circumferential surface of the rear cylinder inner section 5ba and is installed inside the hollow of the rear cylinder plate 5b in a state that allows it to rotate along the circumferential direction of the excavation hole by a hydraulic motor (not shown) or the like for driving the erector.

[0037] The tail seals 12Ba and 12Bb are provided between the inner circumference of the skin plate 5 and the outer circumference of the segment SG at the rear end of the rear outer cylindrical portion 5bb that constitutes the rear shell plate 5b. They are watertight structures that prevent groundwater, soil, and backfill material (hereinafter referred to as "groundwater, etc.") from entering the machine body 3 from the outside on the rear end side of the shield tunneling machine 1 during excavation work. They consist of a metal brush and elastic metal plates positioned in front of, behind, and inside the brush so as to sandwich it.

[0038] The tail seals 12Ba and 12Bb are installed at two locations on the inner circumference of the rearmost end of the skin plate 5, spaced apart from each other along the longitudinal direction of the shield tunneling machine 1 (the axis direction of the central axis of the shield tunneling machine 1 and the direction of extension of the excavated tunnel). In addition, multiple tail seals 12Ba and 12Bb are installed in a ring-like arrangement along the inner circumference of the skin plate 5, surrounding the outer circumference of the segment SG. A seal chamber 12R is formed between these tail seals 12Ba and 12Bb. The number of tail seals installed is not limited to two locations; for example, they may be installed at three or more locations along the longitudinal direction of the shield tunneling machine 1.

[0039] Furthermore, each tail seal 12Ba, 12Bb is installed in a cantilevered manner on the inner circumference of the skin plate 5. That is, one end of each tail seal 12Ba, 12Bb (one end in the front-rear direction of the equipment body 3) is fixed to the inner circumference of the skin plate 5, and the tail seals 12Ba, 12Bb are bent at an angle toward the segment SG between one end and the other end (the other end in the front-rear direction of the equipment body 3), and the other end of the tail seals 12Ba, 12Bb is pressed against the segment SG by the spring force of the tail seals 12Ba, 12Bb and makes contact.

[0040] Furthermore, sealant supply pipes 14 are installed on the outer circumference of the rear shell plate 5b. The sealant supply pipes 14 are pipes for supplying a sealant such as grease to the seal chamber 12R, and multiple pipes are installed on the outer circumference of the rear shell plate 5b. By filling the sealant chamber 12R with sealant through these sealant supply pipes 14, the gap between the inner circumference of the skin plate 5 and the outer circumference of the segment SG is sealed, and in combination with the tail seals 12Ba and 12Bb, groundwater and the like are prevented from entering the shield tunneling machine 1 during excavation work.

[0041] Furthermore, a backfill material supply channel (not shown) is installed on the outer circumference of the rear body plate 5b. The backfill material supply channel is a pipe for supplying backfill material, for example, a cement-based hardening agent or solidifying agent, to the gap between the excavation hole behind the skin plate 5 and the segment SG. By filling the gap between the excavation hole and the segment SG with backfill material, ground subsidence is prevented, and the segment SG and the surrounding ground become an integrated structure, preventing water leakage from the joints of the segment SG.

[0042] Furthermore, the backfill material supply passages are provided in two locations, for example, on either side of the top of the skin plate 5. While the sealant supply pipes 14 are provided in multiple locations on the outer circumference of the skin plate 5, the backfill material supply passages are provided only near the top of the skin plate 5. This is because the sealant has high viscosity, so in order to adhere it to the outer circumference of the segment SG, it must be supplied evenly to the inner circumference of the skin plate 5, whereas the backfill material has low viscosity, so if supplied near the top of the skin plate 5, it will flow down to the lower outer circumference of the segment SG due to its own weight.

[0043] The locations and number of sealant supply pipes 14 and backfill material supply passages are not limited to those described above. For example, more sealant supply pipes 14 may be provided, and the backfill material supply passage may be provided at only one location on the axial top of the skin plate 5.

[0044] Next, the rear burr plate 5b of the shield tunneling machine 1 will be explained using Figure 2. Figure 2 is a diagram showing the main components of the rear burr plate 5b viewed from the side. Note that in Figure 2, the rear burr outer cylinder section 5bb has moved, and the rear burr plate 5b is in its longest state.

[0045] The structure of the rear body plate 5b will now be described. The rear body plate 5b consists of a rear inner cylinder portion 5ba located on the front body plate 5a side, and a rear outer cylinder portion 5bb installed following the rear inner cylinder portion 5ba. The rear inner cylinder portion 5ba and the rear outer cylinder portion 5bb partially overlap in the axial direction. Furthermore, the rear outer cylinder portion 5bb is movable in the axial direction by sliding against the rear inner cylinder portion 5ba. Therefore, the overall length of the rear body plate 5b expands and contracts as the rear outer cylinder portion 5bb moves.

[0046] As shown in Figure 2, a first fixing member groove (first fixing member engagement portion) 21, a second fixing member groove (second fixing member engagement portion) 22, and a transmission member groove (transmission member engagement portion) 23 are formed on the inner circumferential surface of the rear outer cylinder portion 5bb from front to rear. In this application, "circumferential direction" refers to the direction in the plane perpendicular to the axial direction of the rear outer cylinder portion 5bb.

[0047] The first fixing member groove 21 and the second fixing member groove 22 are designed so that fixing members 17 can be detachably and selectively fitted (engaged) by bolts into the rear outer cylinder portion 5bb and the rear inner cylinder portion 5ba to fix the rear outer cylinder portion 5bb to the rear inner cylinder portion 5ba, thereby preventing the rear outer cylinder portion 5bb from moving. That is, as shown in the figure, when the fixing member 17 is fitted into the first fixing member groove 21 and fixed by bolts to the fixing base 16a provided on the intermediate ring body 16 provided on the rear inner cylinder portion 5ba, the rear outer cylinder portion 5bb is fixed to the rear inner cylinder portion 5ba in an extended position, that is, in a state where the length of the rear plate 5b is relatively longer (first state). Furthermore, the rear outer cylinder portion 5bb moves to a length where the position of the first fixing member groove portion 21 becomes the position of the second fixing member groove portion 22. At that length, the fixing member 17 fits into the second fixing member groove portion 22 and is fixed with bolts to the fixing base 16a provided on the intermediate ring body 16 provided on the rear inner cylinder portion 5ba. Thus, the rear outer cylinder portion 5bb is fixed to the rear inner cylinder portion 5ba at the position where the rear outer cylinder portion 5bb has moved, that is, in a state where the length of the rear plate 5b has become relatively shorter (second state).

[0048] In this embodiment, the rear outer cylinder portion 5bb moves in two stages, but it may also move in three or more stages. In this case, in addition to the first fixing member groove portion 21 and the second fixing member groove portion 22, further fixing member groove portions are formed. Also, in this embodiment, the rear outer cylinder portion 5bb is fixed to the rear inner cylinder portion 5ba by fixing the fixing member 17 to a fixing base 16a provided on an intermediate ring body 16 provided on the rear inner cylinder portion 5ba, but the fixing member 17 may also be fixed to a fixing base provided on the rear inner cylinder portion 5ba other than the intermediate ring body 16.

[0049] Furthermore, the transmission member groove 23 is fixed to the shield jack 9b, and the expansion / contraction force transmission member 18 (Figure 20, etc.), which moves the rear outer cylinder portion 5bb axially as the shield jack 9b expands and contracts, is detachably fitted (engaged) into the groove 23 by bolts. Therefore, the rear outer cylinder portion 5bb moves to either the first state or the second state described above as a result of the expansion and contraction of the shield jack 9b.

[0050] In this embodiment, the first fixing member engagement portion, the second fixing member engagement portion, and the transmission member engagement portion are formed as a first fixing member groove 21, a second fixing member groove 22, and a transmission member groove 23, respectively, and are structured so that the fixing member 17 and the expansion / contraction force transmission member 18 fit into them. However, it is sufficient as long as the fixing member 17 and the expansion / contraction force transmission member 18 can be engaged. However, as will be described later, since the spreader 15 moves so as to slide against the inner circumferential surface of the rear outer cylinder portion 5bb, it is undesirable to provide a block for bolting the fixing member 17 and the expansion / contraction force transmission member 18, as this block would become a protrusion on the inner diameter side and interfere with the spreader 15.

[0051] Here, Figure 3 shows a perspective view of the segment used in this embodiment, Figure 4 shows the erector holding the segment in Figure 3 and the annularly assembled segment as seen from the tunnel axis direction, Figure 5 shows the segment holding jig attached to the erector, and Figure 6 shows the mounting pins for detachably attaching the segment holding jig to the erector.

[0052] The segment SG of this embodiment shown in Figure 3 is a steel segment made of steel plate and possessing high toughness. This segment SG has a substantially rectangular shape in plan view and a slightly curved shape in side view, and comprises a skin plate SG-1 corresponding to the outer circumference of the tunnel, a main girder SG-2 erected along the long side of the skin plate SG-1 and a joint plate SG-3 erected along the short side, and a longitudinal rib SG-4 provided to span across two opposing main girders SG-2. In addition, a suspension plate SG-5 with a hole SG-5h formed therein for suspending and holding the segment SG with an erector 11 is provided in the center of the skin plate SG-1.

[0053] As shown in Figure 4, a segment holding jig 11a is detachably attached to the erector 11, which engages with the suspension plate SG-6 provided on the skin plate SG-1 to suspend and hold the segment SG.

[0054] As shown in Figure 5(a), the segment holding jig 11a has a roughly oval shape when viewed from the front, and when extended vertically, it consists of an upper erector-side mounting portion 11a-1 and a lower segment-side mounting portion 11a-2, with an intermediate plate 11a-3 provided between them. Mounting holes h1 and h2 are formed through the erector-side mounting portion 11a-1 and the segment-side mounting portion 11a-2, respectively. Furthermore, as shown in Figure 5(b), in a side view, the erector-side mounting portion 11a-1 is made up of a single plate, while the segment-side mounting portion 11a-2 is made up of two plates that are spaced apart and facing each other.

[0055] Such a segment holding jig 11a is detachably attached to the erector 11 by a mounting pin 30 shown in Figure 6. As shown in the figure, the mounting pin 30 consists of a cylindrical body portion 31 with a truncated cone-shaped tip and a disc-shaped head portion 32 formed at the rear of the body portion 31.

[0056] Then, the mounting hole h1 formed in the erector-side mounting portion 11a-1 of the segment holding jig 11a and the mounting hole (not shown) formed in the erector 11 corresponding to the mounting hole h1 are aligned, and the main body 31 of the mounting pin 30 is inserted through these two mounting holes, thereby enabling the segment holding jig 11a to be detachably attached to the erector 11. Additionally, the two plates of the segment-side mounting portion 11a-2 of the segment holding jig 11a sandwich the hanger plate SG-5 of the segment SG, and the mounting hole h2 formed in the segment-side mounting portion 11a-2 and the hole SG-5h formed in the hanger plate SG-5 of the segment SG are aligned, and a bolt (not shown) is inserted through these two mounting holes and secured with a nut, thereby enabling the segment SG to be suspended and held by the erector 11.

[0057] Here, Figure 7 is a cross-sectional view of the shield tunneling machine in Figure 1 along line A in Figure 2, Figure 8 is a diagram showing a portion of Figure 7, and Figure 9 is a cross-sectional view of the shield tunneling machine in Figure 1 along line B in Figure 2.

[0058] As shown in Figure 7, an intermediate ring body 16 is provided in an annular shape along the inner circumferential surface of the rear inner cylinder portion 5ba, and multiple (eight in this embodiment) shield jacks 9b are installed on the intermediate ring body 16 at regular intervals in the circumferential direction. In addition, between the shield jacks 9b, a fixing member 17 for fixing the rear outer cylinder portion 5bb to the rear inner cylinder portion 5ba is positioned, fitted into a first fixing member groove portion 21 formed in the rear outer cylinder portion 5bb.

[0059] Furthermore, between the two shield jacks 9b at the top and bottom and the fixing member 17, rolling stoppers (regulating means) 19 are provided to restrict the circumferential displacement of the rear outer cylinder portion 5bb relative to the rear inner cylinder portion 5ba. The rolling stoppers 19 prevent rolling (circumferential displacement of the rear outer cylinder portion 5bb), which is likely to occur during curved construction as described later.

[0060] As shown in Figure 8 and Figure 12 described later, the rolling stopper 19 consists of a fitting groove 19a extending along the axial direction of the rear outer cylinder portion 5bb and a fitting member 19b provided in the rear inner cylinder portion 5ba that fits into the fitting groove 19a and is movable along the fitting groove 19a. The fitting groove 19a is formed in a space sandwiched between a pair of plate-like bodies 20 installed parallel to each other on the inner circumferential surface of the rear outer cylinder portion 5bb. In this embodiment, the fitting groove 19a is formed in the rear outer cylinder portion 5bb and the fitting member 19b is provided in the rear inner cylinder portion 5ba, but conversely, the fitting groove 19a may be formed in the rear inner cylinder portion 5ba and the fitting member 19b may be provided in the rear outer cylinder portion 5bb.

[0061] As shown in Figure 9, the spreader 15 attached to the tip of the shield jack 9b is positioned facing the rear of the rear inner cylinder portion 5ba, and its pressing surface 15f (the surface that faces the tip surface of the segment SG and presses against the segment SG) is formed in a roughly arc shape in a front view, which is longer along the circumferential direction of the rear outer cylinder portion 5bb than the tip surface of the rod 9ba of the shield jack 9b or the tip surface of the block 9bb. Due to this shape, the thrust of the shield jack 9b is diffused and transmitted to the segment SG.

[0062] In Figure 9, leg portions (restricting projections) 15a are formed at both ends on the inner circumferential surface side of the rear outer cylinder portion 5bb of the spreader 15, which restrict the spreader 15 from being displaced radially outward from the rear outer cylinder portion 5bb.

[0063] The spreader 15 is attached to the tip of block 9bb, which aligns the position of the rod 9ba of the shield jack 9b with the position of segment SG. As shown in Figure 2, the part of block 9bb that pushes segment SG (i.e., the part to which the spreader 15 is attached) is located radially outward of the rear outer cylinder portion 5bb than the part that is pushed by the rod 9ba of the shield jack 9b. Therefore, when the shield jack 9b pushes segment SG, the spreader 15 attempts to displace radially outward of the rear outer cylinder portion 5bb. If a leg portion 15a that restricts the radially outward displacement of the rear outer cylinder portion 5bb is not formed at this time, the radially outward displacement of the spreader 15 of the rear outer cylinder portion 5bb will be permitted, and when the shield jack 9b is extended and the shield tunneling machine 1 is excavated, a radially outward spreading force will act on the annular segment SG being pushed by the spreader 15. On the other hand, if the leg portion 15a is formed as in this embodiment, no force acting radially outward on the segment SG will occur.

[0064] In this embodiment, the radial outward displacement of the rear outer cylinder portion 5bb of the spreader 15 is restricted by two protrusions, or legs 15a, formed at both ends of the inner circumferential surface of the rear outer cylinder portion 5bb of the spreader 15. However, there may be one or three or more protrusions.

[0065] It is also conceivable to form projections on the inner surface of the rear outer cylinder portion 5bb to restrict the displacement of the spreader 15, rather than forming protrusions such as leg portions 15a on the spreader 15 side. However, in the shield tunneling machine 1 of this embodiment, as described above, the rear outer cylinder portion 5bb moves in the axial direction of the excavated hole by sliding against the rear inner cylinder portion 5ba. Therefore, providing projections on the inner surface of the rear outer cylinder portion 5bb that is in contact with the rear inner cylinder portion 5ba would hinder its movement. For this reason, it is undesirable to provide such projections.

[0066] Furthermore, the inner circumferential surface of the rear outer cylinder portion 5bb has the aforementioned first fixing member groove 21, second fixing member groove 22, and transmission member groove 23 formed thereon. Therefore, when the spreader 15 reaches the position of grooves 22 and 23, the legs 15a will fit into grooves 22 and 23. To prevent this fitting, the portion of the spreader 15 through which the legs 15a pass in grooves 22 and 23 must be flush with the inner circumferential surface of the rear outer cylinder portion 5bb. The member (flat plate 24) used to make the fixing member groove 22 and transmission member groove 23 flush with the inner circumferential surface of the rear outer cylinder portion 5bb at the location through which the legs 15a pass will be described later.

[0067] Here, Figure 10 is a plan view showing the spreader and its surrounding mechanism in this embodiment, and Figure 11 is a plan view showing a spreader and its surrounding mechanism as a comparative example.

[0068] As shown in Figure 10, in the spreader 15 of this embodiment, a recessed portion 15b is formed on the side opposite to the pressing surface 15f to avoid interference with the fixing member 17 when the shield jack 9b is maximally retracted. If the recessed portion 15b is not formed, as shown in Figure 11, the retraction position of the spreader 15 cannot be moved further forward in order to prevent the spreader 15 from interfering with the fixing member 17 when the shield jack 9b is maximally retracted. On the other hand, if the recessed portion 15b is formed as in this embodiment, the spreader 15 will not interfere with the fixing member 17 even if the retraction position of the spreader 15 when the shield jack 9b is maximally retracted is further forward than in the case shown in Figure 11. This makes it possible to maximize the amount of retraction of the rear outer cylinder portion 5bb relative to the rear inner cylinder portion 5ba when the shield jack 9b is retracted, and the length of the rear plate 5b in the second state described above can be made shorter.

[0069] Figure 12 is a plan view showing half of the inner surface of the rear outer cylinder of a shield tunneling machine according to one embodiment of the present invention, Figure 13 is a plan view showing the rear outer cylinder in the axial direction along line C in Figure 9, Figure 14 is a plan view showing the rear outer cylinder in the axial direction along line D in Figure 9, and Figure 15 is a plan view showing the rear outer cylinder in the axial direction along line E in Figure 9.

[0070] In Figure 12, the rear outer cylinder portion 5bb of the shield tunneling machine 1 has the aforementioned first fixing member groove 21, second fixing member groove 22, and transmission member groove 23 formed therein. As shown in the figure, these fixing member grooves 21, 22 and transmission member groove 23 are annular grooves formed over the entire circumference in the circumferential direction of the inner surface of the rear outer cylinder portion 5bb. To specifically explain the formation process of these fixing member grooves 21, 22 and transmission member groove 23, two flat half-circumferential rear outer cylinder portion 5bb are manufactured, each is bent into a semicircle, and the ends are joined by welding to obtain a cylindrical rear outer cylinder portion 5bb. Then, the inner circumference of the rear outer cylinder portion 5bb is machined on a lathe to form the annular grooves, namely the fixing member grooves 21, 22 and transmission member groove 23.

[0071] Furthermore, the grooves 21 for the first fixing member, the grooves 22 for the second fixing member, and the grooves 23 for the transmission member do not need to be formed in an annular shape over the entire circumference of the inner surface of the rear outer cylinder portion 5bb as in this embodiment, but may be formed only at the locations where the fixing member 17 and the expansion / contraction force transmission member 18 are fixed.

[0072] However, if the grooves 21 for the first fixing member, 22 for the second fixing member, and 23 for the transmission member are formed in a spot manner, it is time-consuming because they must be formed only at discontinuous specific locations, and thermal stress is applied to the metal rear outer cylinder portion 5bb, causing distortion. However, if they are formed in an annular shape as in this embodiment, these problems do not occur.

[0073] Now, as shown in Figure 13, along line C in Figure 9, holes 21a and 22a are formed in the axial direction of the rear outer cylinder portion 5bb, for fitting the aforementioned fixing member 17 into the first fixing member groove 21 and the second fixing member groove 22 and fixing it to the rear outer cylinder portion 5bb with bolts.

[0074] Furthermore, as shown in Figure 14, along line D in Figure 9, a hole 23a is formed in the axial direction of the rear outer cylinder portion 5bb for fitting the expansion / contraction force transmission member 18 into the transmission member groove 23 and fixing it to the rear outer cylinder portion 5bb with a bolt.

[0075] Furthermore, as shown in Figure 15, a flat plate (smoothing member) 24 is provided in the axial direction of the rear outer cylinder portion 5bb along line E in Figure 9, so as to make the second fixing member groove 22 and the transmission member groove 23 flush with the inner circumferential surface of the rear outer cylinder portion 5bb and prevent the spreader 15 from getting stuck. In other words, as mentioned above, since the legs 15a of the spreader 15 move along the inner circumferential surface of the rear outer cylinder portion 5bb, without any measures taken, the legs 15a of the spreader 15 would get stuck in the second fixing member groove 22 and the transmission member groove 23, preventing smooth movement. Therefore, by installing the flat plate 24 at the locations in the second fixing member groove 22 and the transmission member groove 23 through which the legs 15a of the spreader 15 pass, the legs 15a are prevented from getting stuck. If the leg portion 15a is not provided, a flat plate 24 is installed in the second fixing member groove portion 22 and the transmission member groove portion 23, at the points where the spreader 15 passes over the entire width.

[0076] In this embodiment, when the fixing member 17 is fitted and fixed into the second fixing member groove 22, the area of ​​the fixing member 17 overlaps with the area through which the spreader 15 (more specifically, the leg portion 15a of the spreader 15 that is in contact with the inner circumferential surface of the rear outer cylinder portion 5bb) passes (i.e., the portion of the flat plate 24 installed in the second fixing member groove 22). Therefore, when fitting the fixing member 17 into the second fixing member groove 22, it interferes with the flat plate 24 installed in the second fixing member groove 22, making it necessary to remove the flat plate 24. To address this, as shown in Figure 15, the flat plate 24 of the second fixing member groove 22 is detachable by bolting. However, if the position of the fixing member 17 when fitted into the second fixing member groove 22 does not coincide with the location through which the spreader 15 passes, then the flat plate 24 installed in the second fixing member groove 22 may also be fixed to the rear outer cylinder portion 5bb.

[0077] Furthermore, in this embodiment, the range of the expansion / contraction force transmission member 18 when fitted and fixed in the transmission member groove 23 does not overlap with the range through which the spreader 15 (more specifically, the leg portion 15a of the spreader 15 that is in contact with the inner circumferential surface of the rear body outer cylinder portion 5bb) passes (i.e., the portion of the flat plate 24 installed in the transmission member groove 23). Therefore, even when the expansion / contraction force transmission member 18 is fitted into the transmission member groove 23, it does not interfere with the flat plate 24 installed in the transmission member groove 23, and there is no need to remove the flat plate 24. On the other hand, in order to prevent damage to the segment SG, it is better to cover the transmission member groove 23. Therefore, as shown in Figure 15, the flat plate 24 of the transmission member groove 23 is fixed to the rear body outer cylinder portion 5bb. However, when the range in which the expansion / contraction force transmission member 18 is fitted into the transmission member groove 23 overlaps with the range through which the spreader 15 passes, the flat plate 24 installed in the transmission member groove 23 is made detachable by bolting.

[0078] Furthermore, it is desirable to fix the flat plate 24 to the rear outer cylinder portion 5bb by staggered welding (intermittent fillet welding in which welded and unwelded portions alternate) to reduce the heat input during welding.

[0079] (Example 1)

[0080] Next, as Example 1, the extension and retraction operation of the rear muzzle plate 5b in the shield tunneling machine 1 having the above configuration will be explained using Figures 16 to 30. Here, Figures 16 to 23 are diagrams that continuously show the contraction operation of the rear muzzle plate of the shield tunneling machine in Figure 1, and Figures 24 to 30 are diagrams that continuously show the extension operation of the rear muzzle plate of the shield tunneling machine in Figure 1. In these drawings, (a) is a conceptual diagram of the rear muzzle plate viewed from above, and (b) is an explanatory diagram of the rear muzzle plate viewed from the side. Also, in (a), two adjacent shield jacks are shown from the eight shield jacks installed in this embodiment, and the other pairs of shield jacks operate in the same way.

[0081] In the shield tunneling machine 1, which performs extension and retraction of the rear casing plate 5b, the dimensions of the rear casing outer section 5bb in the first state shown in Figure 2 are as follows: the length of the portion not overlapping with the rear casing inner section 5ba (effective length: FL) is 1970 mm; the length of the effective length excluding the tail seals 12Ba and 12Bb (L1) is 1490 mm; the length of the tail seals 12Ba and 12Bb (L2) is 480 mm; and the distance between the first fixing member groove 21 and the second fixing member groove 22 (L3) is 300 mm. The movable length of the rear casing outer section 5bb corresponds to the distance between the first fixing member groove 21 and the second fixing member groove 22 (L3), which is 300 mm. However, these dimensions are just examples, and the present invention is not limited to these dimensions.

[0082] First, we will explain the contraction operation of the rear burrow plate 5b of the shield tunneling machine 1 (the operation in which the outer cylinder portion 5bb of the rear burrow moves from the first state to the second state). Note that the rear burrow plate 5b is mainly contracted when transitioning from straight construction to curved construction.

[0083] As shown in Figure 16, in straight construction, the rear shell outer cylinder 5bb is set to the first state, and the length of the rear shell plate 5b is increased, so that, for example, 900 mm wide segments SG are continuously installed in the excavation hole. In this state, the fixing member 17 is fitted into the first fixing member groove 21 and fixed to the fixing base 16a, and the flat plate 24 is installed in the second fixing member groove 22. The segments SG are tunnel lining members that are assembled in a ring shape within the shield tunneling machine 1 to form a tunnel.

[0084] To transition to curved construction from here, in order to shorten the length by contracting the rear body plate 5b by putting the rear body outer cylinder 5bb into the second state, first, as shown in Figure 17, the shield jack 9b is stroked to a predetermined length (a length that allows the expansion and contraction force transmission member 18 to be fitted into the transmission member groove 23) to advance the shield tunneling machine 1 and create enough space to assemble, for example, a 300 mm wide segment SG for curved construction.

[0085] Next, the flat plate 24 installed in the second fixing member groove 22 is removed, and as shown in Figure 18, the fixing member 17 fixed to the fixing base 16a is removed and moved from the first fixing member groove 21 to the second fixing member groove 22.

[0086] Next, as shown in Figure 19, some of the shield jacks 9b are pressed against the segment SG (i.e., a buckling prevention measure is in place to prevent the shield tunneling machine 1 from retracting), and the other shield jacks 9b are pulled out to a predetermined length. The length to which the shield jacks 9b are pulled out is such that the expansion and contraction force transmission member 18, described later, can be fitted into the transmission member groove 23 and fixed to the tip of the shield jack 9b, and a spacer 18a (Figure 24, etc.) can be attached to that tip. In this embodiment, the buckling prevention measure is performed with a total of four shield jacks 9b: two at the top and two at the bottom. However, it is also possible to perform the buckling prevention measure with other shield jacks 9b.

[0087] Next, as shown in Figure 20, the expansion and contraction force transmission member 18 is fitted into the transmission member groove 23 and fixed to the rear outer cylinder portion 5bb with bolts, and then fixed to the tip of the shield jack 9b (more specifically, to the spreader 15 provided on the shield jack 9b) with tension bolts.

[0088] Next, as shown in Figure 21, the shield jack 9b is pulled until the fixing member 17, which is fitted into the second fixing member groove 22, contacts the fixing base 16a. This moves the rear outer cylinder portion 5bb forward, resulting in a second state where the length of the rear body plate 5b is relatively shortened. Here, the distance between the first fixing member groove 21 and the second fixing member groove 22 (length L3 in Figure 2) is 300 mm, so the length of the rear body plate 5b is shortened by 300 mm.

[0089] Once the rear outer cylinder portion 5bb has moved forward in this manner, the fixing member 17 is bolted to the fixing base 16a, and the expansion / contraction force transmission member 18 is removed and the shield jack 9b is pulled further, as shown in Figure 22. This completes the transition to the curve construction state, which has good curve-following ability and allows for smooth curve construction.

[0090] Subsequently, while performing curved excavation with the shield tunneling machine 1, curved construction segments SG (for example, segments SG with a width of 300 mm) are installed as shown in Figure 23.

[0091] Next, we will explain the extension operation of the rear burrow plate 5b of the shield tunneling machine 1 (the operation in which the outer cylinder portion 5bb of the rear burrow moves from the second state to the first state). Note that the rear burrow plate 5b is extended mainly when transitioning from curved construction to straight construction.

[0092] Once the curve construction is complete with the rear outer cylinder portion 5bb in the second state and the rear plate 5b shortened, as shown in Figure 24, some of the shield jacks 9b are pressed against the segment SG, and the expansion / contraction force transmission members 18 are fitted into the transmission member grooves 23 on the extension of the other shield jacks 9b and fixed to the rear outer cylinder portion 5bb with bolts. Furthermore, a spacer 18a is attached to the segment SG side of the expansion / contraction force transmission member 18. As shown in the figure, a small gap is formed between the spacer 18a attached to the expansion / contraction force transmission member 18 and the segment SG because space is required to attach the spacer 18a to the expansion / contraction force transmission member 18.

[0093] Next, as shown in Figure 25, the shield jack 9b is extended to bring the spreader 15 into contact with the expansion / contraction force transmission member 18, and the fixing member 17 fitted into the second fixing member groove 22 is removed. As a result, the rear outer cylinder portion 5bb is released from fastening with the fixing base 16a provided on the intermediate ring body 16, and becomes movable in the axial direction.

[0094] Next, as shown in Figure 26, the shield jack 9b is extended to press the spacer 18a against the segment SG, moving the rear body inner cylinder 5ba forward and positioning it so that the fixing member 17 can be fitted into the first fixing member groove 21 and fixed to the fixing base 16a. As a result, the rear body inner cylinder 5ba moves forward, resulting in the first state where the length of the rear body plate 5b is relatively longer. Here, the distance between the first fixing member groove 21 and the second fixing member groove 22 (length L3 in Figure 2) is 300 mm, so the length of the rear body plate 5b becomes 300 mm longer.

[0095] As mentioned above, a small gap is formed between the spacer 18a and the segment SG. Therefore, when the shield jack 9b extends and the spacer 18a is pressed against the segment SG via the expansion / contraction force transmission member 18, the rear outer cylinder portion 5bb moves backward by the amount of this gap. As a result, the tail seals 12Ba and 12Bb move backward in the opposite direction to their original movement (forward movement) relative to the segment SG. However, since the amount of movement is small, corresponding to the aforementioned gap, no problems such as deformation of the shape of the tail seals 12Ba and 12Bb occur.

[0096] Next, as shown in Figure 27, the fixing member 17 is fitted into the first fixing member groove 21 and fixed to the fixing base 16a, and also fixed to the rear outer cylinder portion 5bb with bolts. In addition, the flat plate 24 is installed in the second fixing member groove 22.

[0097] Next, as shown in Figure 28, the shield jack 9b without the expansion / contraction force transmission member 18 and spacer 18a is pressed against the segment SG. Then, the shield jack 9b with the expansion / contraction force transmission member 18 and spacer 18a attached is slightly pulled back to create a gap between the spacer 18a and the segment SG, and the expansion / contraction force transmission member 18 and spacer 18a are removed.

[0098] Next, as shown in Figure 29, the shield jacks 9b are extended to advance the shield tunneling machine 1, creating enough space to assemble the segments SG for straight construction.

[0099] Next, as shown in Figure 30, pulling the shield jack 9b completes the transition to the straight-line construction state, which allows for smooth straight-line construction.

[0100] After that, while performing straight excavation with the shield tunneling machine 1, segments SG for straight construction (for example, segments SG with a width of 900 mm) are installed.

[0101] Thus, according to the shield tunneling machine 1 of this embodiment, the outer cylinder portion 5bb of the rear body that constitutes the rear body plate 5b is movable in the axial direction by sliding with the inner cylinder portion 5ba of the rear body, and the overall length of the rear body plate 5b is extended or retracted by the movement of the outer cylinder portion 5bb of the rear body. Therefore, by moving the outer cylinder portion 5bb of the rear body from the first state to the second state, it becomes possible to perform curved construction smoothly. As a result, not only is the ability to follow curves improved, but over-excavation is also prevented.

[0102] Here, the structures of the aforementioned expansion / contraction force transmission member 18 and spacer 18a will be explained using Figures 31 and 32. Figure 31(a) is a plan view of the expansion / contraction force transmission member in this embodiment, Figure 31(b) is a cross-sectional view along line AA in Figure 31(a), and Figure 31(c) is a cross-sectional view along line BB in Figure 31(a). Also, Figure 32(a) is a plan view of the spacer in this embodiment, Figure 32(b) is a cross-sectional view along line CC in Figure 32(a), and Figure 32(c) is a cross-sectional view along line DD in Figure 32(a).

[0103] As shown in Figure 31, the expansion / contraction force transmission member 18 of this embodiment is made of steel and consists of a main body 18-1 with one side (top surface) of a box-shaped cube as an opening 18-1a, and a partition wall 18-2 that divides the interior of the main body 18-1 by spanning across two mutually opposing surfaces adjacent to the opening 18-1a. Furthermore, on the back surface of the main body 18-1, a fitting projection 18-1b is formed that extends in the longitudinal direction of the main body 18-1 and fits into a transmission member groove 23 formed on the inner circumferential surface of the rear outer cylinder 5bb. In addition, a hole 18-2h is formed in the center of the partition wall 18-2 for suspending and holding the expansion / contraction force transmission member 18 with the erector 11.

[0104] Then, when the fitting projection 18-1b fits into the groove 23 for the transmission member, the expansion and contraction force transmission member 18 is positioned such that the partition wall 18-2 is aligned with the axial direction of the rear body plate 5b and the opening 18-1a faces the radial center of the rear body plate 5b.

[0105] Next, as shown in Figure 32, the spacer 18a is made of steel and consists of a main body 18a-1 made of a plurality (three in this embodiment) of cylindrical steel pipes 18p arranged in parallel, end plates 18a-2 attached to both ends of the main body 18a-1, and a base plate 18a-3 attached along the main body 18a-1 (more specifically, the steel pipe 18p located in the middle that makes up the main body 18a-1). Mounting plates 18a-4 are attached to both ends of the base plate 18a-3 along the circumferential direction of the steel pipe 18p for welding and fixing the base plate 1a-3 to the steel pipe 18p.

[0106] In this configuration, the spacer 18a is positioned such that the end plate 18a-2 faces the rear body plate 5b in the axial direction, and the base plate 18a-3 faces the center of the rear body plate 5b.

[0107] Now, since the steel expansion force transmission members 18 weigh about 30-40 kg each and the spacers 18a weigh about 35-45 kg each, it is difficult for workers to transport, install, or remove the expansion force transmission members 18 and spacers 18a inside the shield tunneling machine 1, which is surrounded by various pieces of equipment, as described above.

[0108] Therefore, in this embodiment, a holding attachment 40 capable of holding the expansion / contraction force transmission member 18 and the spacer 18a is attached to the erector 11, and the expansion / contraction force transmission member 18 and the spacer 18a are suspended and held by the erector 11 using the holding attachment 40, and are transported and installed to a predetermined installation location by the erector 11, or removed from the predetermined installation location. The holding attachment 40 is structured to be selectively attached to the erector 11 with the aforementioned segment holding jig 11a.

[0109] In this embodiment, the retaining attachment 40 consists of a first attachment 41 for holding the expansion / contraction force transmission member 18 and a second attachment 42 for holding the spacer 18a.

[0110] The specific configuration of the retaining attachment 40 will be described below with reference to Figures 33 and 34. Here, Figure 33(a) is a front view of the first attachment in this embodiment, Figure 33(b) is a side view of the first attachment, Figure 34(a) is a front view of the second attachment, Figure 34(b) is a side view of the second attachment, and Figure 34(c) is a top view of the second attachment.

[0111] As shown in Figure 33, the first attachment 41 consists of a rectangular base plate 41a, a plate-shaped erector-side mounting portion 41b erected on the upper surface of the base plate 41a, and a plate-shaped expansion / contraction force transmission member-side mounting portion 41c erected on the lower surface. As shown in the figure, the erector-side mounting portion 41b is fixed in a direction such that its front (rear) surface faces forward when the first attachment 41 is viewed from the front, and the expansion / contraction force transmission member-side mounting portion 41c is attached at a 90-degree angle to the erector-side mounting portion 41b. Furthermore, while the erector-side mounting portion 41b is made up of a single plate, the expansion / contraction force transmission member-side mounting portion 41c is made up of two plates that are spaced apart and facing each other.

[0112] Mounting holes h3 and h4 are formed through the erector-side mounting portion 41b and the expansion / contraction force transmission member-side mounting portion 41c, respectively. The diameter of mounting hole h3 is the same as the diameter of mounting hole h1 formed in the erector-side mounting portion 11a-1 of the segment holding jig 11a described above, and the diameter of mounting hole h4 is the same as the diameter of mounting hole h2 formed in the segment-side mounting portion 11a-2 of the segment holding jig 11a.

[0113] Furthermore, two retaining plates 41d are erected at both ends of the upper surface of the base plate 41a, sandwiching the erector-side mounting portion 41b.

[0114] The first attachment 41 is then attached by sandwiching the partition wall 18-2 of the stretchable force transmission member 18 between the two plates of the stretchable force transmission member side mounting portion 41c of the first attachment 41, and by aligning the mounting hole h4 formed in the stretchable force transmission member side mounting portion 41c with the hole 18-2h formed in the partition wall 18-2 of the stretchable force transmission member 18. The bolt BL is then inserted through these two mounting holes and secured at the end with a nut NT. In this way, the first attachment 41 is detachably attached to the stretchable force transmission member 18.

[0115] Figure 35 shows the stretchable force transmission member 18 to which the first attachment 41 is attached. Here, Figure 35(a) is a plan view of the stretchable force transmission member to which the first attachment is attached in this embodiment, Figure 35(b) is a cross-sectional view along the line EE in Figure 35(a), and Figure 35(c) is a cross-sectional view along the line FF in Figure 35(a).

[0116] Now, by aligning the mounting hole h3 formed in the erector-side mounting portion 41b of the first attachment 41 with the mounting hole (not shown) formed in the erector 11 corresponding to the mounting hole h3, and then inserting the main body 31 of the aforementioned mounting pin 30 (Figure 6) through these two mounting holes, the first attachment 41 can be detachably attached to the erector 11.

[0117] With the above installation work, the expansion / contraction force transmission member 18 is suspended and held by the erector 11 by the first attachment 41. Figure 36 shows a front view of the state in which the expansion / contraction force transmission member 18 is held by the erector 11.

[0118] Next, as shown in Figure 34, the second attachment 42 consists of a rectangular base plate 42a and a plate-shaped erector-side mounting portion 42b erected on the upper surface of the base plate 42a. As shown in the figure, the erector-side mounting portion 42b is made up of a single plate and is fixed in a direction such that the front (rear) surface faces forward when the second attachment 42 is viewed from the front.

[0119] Mounting holes h5 are formed through the erector-side mounting portion 42b. The diameter of these mounting holes h5 is the same as the diameter of the mounting holes h1 formed in the erector-side mounting portion 11a-1 of the segment holding jig 11a described above. In addition, a total of four mounting holes h6 are formed through the base plate 42a, two on each side of the erector-side mounting portion 42b.

[0120] Furthermore, two retaining plates 42c are erected at both ends of the upper surface of the base plate 42a, sandwiching the erector-side mounting portion 42b.

[0121] Then, the back surface of the base plate 42a of the second attachment 42 is brought into surface contact with the surface of the base plate 18a-3 provided on the spacer 18a, and tap screws TS are inserted through the four mounting holes h6 formed in the base plate 42a of the second attachment 42 to cut screw grooves into the base plate 18a-3 of the spacer 18a and fix it in place. In this way, the second attachment 42 is detachably attached to the spacer 18a.

[0122] Figure 37 shows the spacer 18a to which the second attachment 42 is attached. Here, Figure 37(a) is a plan view of the spacer in this embodiment, Figure 37(b) is a cross-sectional view along the GG line in Figure 37(a), and Figure 37(c) is a cross-sectional view along the HH line in Figure 37(a).

[0123] The structure by which the second attachment 42 is detachably attached to the erector 11 is the same as the structure by which the first attachment 41 is detachably attached to the erector 11 as described above.

[0124] With the above installation work, the spacer 18a is suspended and held by the second attachment 42 on the erector 11. Figure 38 shows a front view of the spacer 18a being held on the erector 11.

[0125] Thus, according to the shield tunneling machine 1 of this embodiment, the expansion and contraction force transmission member 18 and spacer 18a are attached to the erector 11 using a holding attachment 40 (first attachment 41, second attachment 42), and the expansion and contraction force transmission member 18 and spacer 18a are suspended and held by the erector 11 using the holding attachment 40, and the erector 11 is used to transport and install them at a predetermined installation location, or to remove them from the predetermined installation location. Therefore, the expansion and contraction force transmission member 18 and spacer 18a can be easily transported and installed at a predetermined installation location, and can be easily removed from the predetermined installation location.

[0126] (Example 2)

[0127] Next, as Example 2, the replacement of the tail seal 12Ba in the shield tunneling machine 1 having the above configuration will be explained using Figures 39 to 53. Here, Figures 39 to 53 are diagrams that sequentially show the procedure for replacing the tail seal of the shield tunneling machine in Example 2. In these drawings, (a) is a conceptual diagram of the rear body plate viewed from above, and (b) is an explanatory diagram of the rear body plate viewed from the side. Also, in (a), two adjacent shield jacks are shown from the eight shield jacks installed in this embodiment, and the other sets of shield jacks operate in the same way.

[0128] In the shield tunneling machine 1 used for replacing the tail seal 12Ba, as shown in Figure 2, the dimensions of the rear outer cylinder portion 5bb in the first state are as follows: the length of the portion not overlapping with the rear inner cylinder portion 5ba (effective length: FL) is 1610 mm; the length of the effective length excluding the tail seals 12Ba and 12Bb (L1) is 1130 mm; the length of the tail seals 12Ba and 12Bb (L2) is 480 mm; and the distance between the first fixing member groove 21 and the second fixing member groove 22 (L3) is 350 mm. The movable length of the rear outer cylinder portion 5bb corresponds to the distance between the first fixing member groove 21 and the second fixing member groove 22 (L3), which is 350 mm. However, these dimensions are just examples, and the present invention is not limited to these dimensions.

[0129] Furthermore, the tail seal to be replaced is the front tail seal 12Ba, of the two tail seals 12Ba and 12Bb located at the front and rear. This is because the rear tail seal 12Bb is directly subjected to the pressure of groundwater and sediment, and therefore cannot be removed for replacement.

[0130] Furthermore, due to the dimensions of the rear fuselage outer cylinder portion 5bb described above, when the rear fuselage outer cylinder portion 5bb is in the second state (a position where the length of the rear fuselage plate 5b is relatively shorter), the tail seal 12Ba located forward is detached from the segment SG and exposed inside the aircraft.

[0131] Now, when replacing the tail seal 12Ba, the rear outer cylinder portion 5bb is left in the first state, as shown in Figure 39. In this first state, the fixing member 17 is fitted into the first fixing member groove 21 and fixed to the fixing base 16a, and the flat plate 24 is installed in the second fixing member groove 22.

[0132] Next, as shown in Figure 40, the shield jack 9b is stroked to a predetermined length (a length that allows the expansion and contraction force transmission member 18 to be fitted into the transmission member groove 23) to advance the shield tunneling machine 1.

[0133] Next, after removing the flat plate 24 installed in the second fixing member groove 22, the fixing member 17 is removed from the rear cylinder portion 5ba, and as shown in Figure 41, the removed fixing member 17 is moved to the second fixing member groove 22.

[0134] Next, as shown in Figure 42, one of the shield jacks 9b (the lower shield jack 9b in the case of Figure 42(a)) is pressed against the segment SG (i.e., the buckling prevention measure is in place), and the other shield jack 9b (the upper shield jack 9b in the case of Figure 42(a)) is extended to a predetermined length and pressed against the segment SG with the buckling prevention member 25 in between.

[0135] Here, the buckling prevention member 25 will be described using Figure 54. Here, Figure 54(a) is a plan view of the buckling prevention member in this embodiment, Figure 54(b) is a cross-sectional view along line II in Figure 54(a), and Figure 54(c) is a cross-sectional view along line JJ in Figure 54(a).

[0136] In this embodiment, eight shield jacks 9b are provided, and every other shield jack 9b is pressed against the segment SG via a buckling prevention member 25. As shown in Figure 55, a total of four buckling prevention members 25 are installed in the circumferential direction.

[0137] As shown in Figure 54, the buckling prevention member 25 of this embodiment consists of a long main body portion 25a made of H-shaped steel formed by flanges 25a-1 corresponding to two vertical H-shapes and a web 25a-2 corresponding to one horizontal H-shape, and two end plates 25b and 25c attached to both ends of the main body portion 25a. In order to diffuse the thrust of the shield jack 9b and transmit it to the segment SG, the end plate 25c on the segment SG side is longer in the width direction than the end plate 25b on the shield jack 9b side. In addition, two oval-shaped mounting holes 25ah are formed through both sides of the web 25a-2 on the upper flange 25a-1 that forms the main body portion 25a, for a total of four holes. These mounting holes 25ah correspond to the four mounting holes h6 formed in the base plate 42a of the second attachment 42 described above.

[0138] The buckling prevention member 25 is positioned such that the end plates 25b and 25c face each other in the axial direction of the rear body plate 5b, and the flange 25a-1 constituting the main body portion 25a faces the radial center of the rear body plate 5b. Therefore, the buckling prevention member 25 is positioned to be long in the extension and retraction direction of the shield jack 9b.

[0139] The main body 25a may be made of steel other than H-shaped steel (for example, I-shaped steel, angle steel, channel steel, Z-shaped steel, or steel pipes with a hollow cross-section that is circular or square), and the two end plates 25b and 25c may be the same shape as each other.

[0140] Next, as shown in Figure 43, the shield jack 9b (the lower shield jack 9b in the case shown in Figure 43(a)) pressed against the segment SG is extended to a predetermined length, the expansion and contraction force transmission member 18 is fitted into the transmission member groove 23 and fixed to the rear outer cylinder portion 5bb with bolts, and the tip of the shield jack 9b (more specifically, to the spreader 15 provided on the shield jack 9b) is fixed with tension bolts.

[0141] Next, as shown in Figure 44, the shield jack 9b to which the expansion / contraction force transmission member 18 is fixed is pulled to a predetermined length to pull in the rear fuselage outer cylinder 5bb. Specifically, the shield jack 9b is pulled until the fixing member 17, which is fitted into the second fixing member groove 22, contacts the fixing base 16a. As a result, the rear fuselage outer cylinder 5bb moves forward, resulting in a second state where the length of the rear fuselage plate 5b is relatively shortened. Here, since the distance between the first fixing member groove 21 and the second fixing member groove 22 (length L3 in Figure 2) is 350 mm, the length of the rear fuselage plate 5b is shortened by 350 mm. Then, as the rear fuselage outer cylinder 5bb moves forward, the tail seal 12Ba detaches from the segment SG and is exposed inside the machine, as shown in the figure. The fixing member 17 is fixed to the fixing base 16a with bolts.

[0142] Next, as shown in Figure 45, the portion of the tail seal 12Ba that does not interfere with the buckling prevention member 25 is replaced with a new tail seal 12Ba. In Figure 45, the portion of the tail seal 12Ba to be replaced is indicated by a mesh line.

[0143] As mentioned above, the tail seal 12Ba is composed of a metal brush and an elastic metal plate. Therefore, replacing the tail seal 12Ba requires cutting and removing the portion of the tail seal 12Ba to be replaced using a gas burner. During this cutting process, the red-hot portion of the tail seal 12Ba is blown off, causing sparks to fly. If, at this time, the shield jack 9b (specifically, the rod 9ba of the shield jack 9b) is extended and pressed against the segment SG to prevent buckling, the flying sparks could damage the rod 9ba of the nearby shield jack 9b.

[0144] However, in this embodiment, a buckling prevention member 25 made of steel material such as H-shaped steel is interposed between the shield jack 9b and the segment SG to prevent buckling. The length of the buckling prevention member 25 is such that scattered sparks do not reach the shield jack 9b, thus protecting the shield jack 9b from sparks. As a result, scattered sparks will fall on the buckling prevention member 25, but the shield jack 9b will be protected from sparks. Therefore, according to this embodiment, the shield jack 9b will not be damaged by scattered sparks during the replacement of the tail seal 12Ba using a gas burner.

[0145] However, if the shield jack 9b is protected in advance with fire-resistant material, or if the shield jack 9b itself is made of fire-resistant material, it is considered that there will be no problem even if scattered sparks fall on the shield jack 9b. In such cases, the buckling prevention measure can be performed by directly pressing the rod 9ba of the shield jack 9b directly against the segment SG without using the buckling prevention member 25, so the buckling prevention member 25 becomes unnecessary.

[0146] Once a portion of the tail seal 12Ba has been replaced in this manner, as shown in Figure 46, the expansion and contraction force transmission member 18 is removed from the transmission member groove 23, the buckling prevention member 25 is interposed between the removed shield jack 9b and the segment SG, and the shield jack 9b is extended to press the buckling prevention member 25 against the segment SG.

[0147] Next, as shown in Figure 47, the buckling prevention member 25 located in the portion where the tail seal 12Ba has not been replaced is removed, and the expansion / contraction force transmission member 18 is fitted into the transmission member groove 23 and fixed to the rear outer cylinder portion 5bb with bolts, and also fixed to the tip of the shield jack 9b (more specifically, to the spreader 15 provided on the shield jack 9b) with tension bolts. However, since the buckling prevention member 25 is interposed between the shield jack 9b and the segment SG in the portion where the tail seal 12Ba has been replaced, and the fixing member 17 is fixed to the fixing base 16a, the installation of the expansion / contraction force transmission member 18 may be omitted.

[0148] Once the position of the buckling prevention member 25 has been swapped in this manner, as shown in Figure 48, the portion of the tail seal 12Ba that no longer interferes with the buckling prevention member 25 (i.e., the remaining portion of the tail seal 12Ba) is replaced with a new tail seal 12Ba. This effectively replaces the entire tail seal 12Ba.

[0149] Then, as shown in Figure 49, the buckling prevention member 25 is removed and the segment SG is installed. As a result, the new tail seal 12Ba, which was exposed inside the machine, is pushed radially outward by the segment SG and positioned on the outer circumference of the installed segment SG. This completes the replacement of the tail seal 12Ba in the shield tunneling machine 1. With the segment SG installed, buckling prevention is performed by the shield jack 9b, which does not have the expansion / contraction force transmission member 18 fixed to it.

[0150] Once the tail seal 12Ba has been replaced and the segment SG has been installed, as shown in Figure 50, a spacer 18a is attached to the segment SG side of the expansion / contraction force transmission member 18, and the fixing member 17 fitted into the second fixing member groove 22 is removed. As a result, the rear outer cylinder portion 5bb is released from fastening to the fixing base 16a and becomes movable in the axial direction. As shown in the figure, a small gap is formed between the spacer 18a attached to the expansion / contraction force transmission member 18 and the segment SG because space is required to attach the spacer 18a to the expansion / contraction force transmission member 18.

[0151] Next, as shown in Figure 51, the shield jack 9b is extended to move the rear inner cylinder portion 5ba forward, and the fixing member 17 is fitted into the first fixing member groove 21 and fixed to the fixing base 16a, and also fixed to the rear outer cylinder portion 5bb with bolts. In addition, the flat plate 24 is installed in the second fixing member groove 22. As a result, the rear inner cylinder portion 5ba moves forward, resulting in the first state in which the length of the rear plate 5b is relatively longer. Here, the distance between the first fixing member groove 21 and the second fixing member groove 22 (length L3 in Figure 2) is 350 mm, so the length of the rear plate 5b becomes 350 mm longer.

[0152] As mentioned above, a small gap is formed between the spacer 18a and the segment SG. Therefore, when the shield jack 9b extends and the spacer 18a is pressed against the segment SG via the expansion / contraction force transmission member 18, the rear outer cylinder portion 5bb moves backward by the amount of this gap. As a result, the tail seals 12Ba and 12Bb move backward in the opposite direction to their original movement (forward movement) relative to the segment SG. However, since the amount of movement is small, corresponding to the aforementioned gap, no problems such as deformation of the shape of the tail seals 12Ba and 12Bb occur.

[0153] Next, as shown in Figure 52, with the shield jack 9b without the expansion / contraction force transmission member 18 and spacer 18a attached pressed against the segment SG, the shield jack 9b with the expansion / contraction force transmission member 18 and spacer 18a attached is slightly pulled to create a gap between the spacer 18a and the segment SG, and the expansion / contraction force transmission member 18 and spacer 18a are removed.

[0154] Next, as shown in Figure 53, the shield jack 9b is pulled to install the segment SG.

[0155] As described above, in the shield tunneling machine 1 of this embodiment, the outer cylinder portion 5bb of the rear shell, which constitutes the rear shell plate 5b, is movable in the axial direction by sliding with the inner cylinder portion 5ba of the rear shell. Therefore, by moving the outer cylinder portion 5bb of the rear shell from the first state to the second state, the tail seal 12Ba is detached from the segment SG and exposed inside the machine. Consequently, the tail seal 12Ba can be replaced from inside the shield machine. This makes it possible to prevent problems caused by deterioration or damage to the tail seal 12Ba.

[0156] Now, not only the aforementioned steel expansion and contraction force transmission members 18 and spacers 18a, but also the buckling prevention members 25 weigh approximately 20-30 kg each, making it difficult for workers to carry, install, or remove the buckling prevention members 25 inside the shield tunneling machine 1, which is surrounded by various pieces of equipment, as described above.

[0157] Therefore, in this embodiment, a retaining attachment 40 capable of holding the buckling prevention member 25 is attached to the erector 11, and the buckling prevention member 25 is suspended and held by the erector 11 using the retaining attachment 40, and the erector 11 is used to transport and install it to a predetermined installation location, or to remove it from the predetermined installation location. Furthermore, the same second attachment 42 as the attachment for holding the spacer 18a described above is used as the retaining attachment 40 capable of holding the buckling prevention member 25, and the method of attachment is almost the same as in the case of the second attachment 42.

[0158] Specifically, the back surface of the base plate 42a of the second attachment 42 is brought into surface contact with the surface of the upper flange 25a-1 that constitutes the buckling prevention member 25, and the four mounting holes h6 formed in the base plate 42a of the second attachment 42 and the four mounting holes 25ah formed in the flange 25a-1 of the buckling prevention member 25 are made to overlap, and the bolt BL is inserted through the overlapping mounting holes h6 and mounting holes 25ah and secured at the end with a nut NT. In this way, the second attachment 42 is detachably attached to the buckling prevention member 25.

[0159] Figure 56 shows the buckling prevention member 25 to which the second attachment 42 is attached. Here, Figure 56(a) is a plan view of the buckling prevention member in this embodiment, Figure 56(b) is a cross-sectional view along the KK line in Figure 56(a), and Figure 56(c) is a cross-sectional view along the LL line in Figure 56(a).

[0160] The structure by which the second attachment 42 is detachably attached to the erector 11 is the same as the structure by which the first attachment 41 is detachably attached to the erector 11 as described above.

[0161] With the above installation work, the buckling prevention member 25 is suspended and held by the second attachment 42 on the erector 11. Figure 57 shows a front view of the state in which the buckling prevention member 25 is held on the erector 11.

[0162] Thus, according to the shield tunneling machine 1 of this embodiment, the buckling prevention member 25 is attached to the erector 11 using a second attachment 42 which is a holding attachment 40, and the buckling prevention member 25 is suspended and held by the erector 11 using the holding attachment 40, and then transported and installed to a predetermined installation location by the erector 11, and further removed from the predetermined installation location. Therefore, the buckling prevention member 25 can be easily transported and installed to a predetermined installation location, and easily removed from the predetermined installation location.

[0163] 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.

[0164] For example, the structures of the expansion / contraction force transmission member 18, the spacer 18a, and the buckling prevention member 25 are not limited to those shown in this embodiment. The expansion / contraction force transmission member 18 can be freely constructed as long as it can move the rear outer cylinder portion 5bb axially by the expansion and contraction of the shield jack 9b, the spacer 18a can be installed in the gap between the expansion / contraction force transmission member 18 and the segment SG, and the buckling prevention member 25 can be interposed between the shield jack 9b and the segment SG to prevent the shield tunneling machine 1 from retracting.

[0165] Furthermore, in this embodiment, the retaining attachment 40 consists of a first attachment 41 that holds the stretchable force transmission member 18, and a second attachment 42 that holds the spacer 18a and the buckling prevention member 25. However, the stretchable force transmission member 18, the spacer 18a, and the buckling prevention member 25 may be held by a common retaining attachment 40, or they may be held by different retaining attachments 40. [Industrial applicability]

[0166] The above description has focused on the application of the present invention to a mud pressure balance shield tunneling machine, but it is not limited to this. For example, it can also be applied to other shield tunneling machines, such as a slurry-type shield tunneling machine that stabilizes the tunnel face by applying a predetermined pressure to the mud in the chamber and transports the excavated soil by circulating the mud. [Explanation of Symbols]

[0167] 1. Shield tunneling machine 2 cutter heads 3. Main unit of the device 4 chambers 5 Skin Plates 5a Front fuselage plate (front fuselage section) 5b Rear fuselage plate (rear fuselage section) 5ba Rear barrel inner section 5bb Rear outer barrel section 9a Folding jack 9b Shield Jack 9ba rod 9bb block 11 Erecta 12Ba, 12Bb tail seal 12R seal chamber 15 Spreader 15a Leg (regulatory protrusion) 15b Concave part 15f Pressing surface 16 Intermediate ring body 16a Fixed stand 17 Fixing member 18. Force transmission member 18-1 Main body 18-1a opening 18-1b Fitting protrusion 18-2 Partition Wall 18-2h hole 18a Spacer 18a-1 Main body 18a-2 End Plate 18a-3 Base plate 18a-4 Mounting plate 18p steel pipe 19. Rolling stopper (regulating device) 19a Fitting groove 19b Fitting member 20 Plate-like body 21 Groove for the first fixing member (engaging portion for the first fixing member) 22 Groove for second fixing member (engaging portion for second fixing member) 23. Groove for transmission member (engaging portion for transmission member) 21a, 22a, 23a Hole 24 Flat plate (smoothing member) 25. Backring prevention member 25a Main body 25a-1 Flange 25ah mounting hole 25a-2 Web 25b, 25c End Plates 30 mounting pins 31 Main body 32 Head 40 Retaining attachments 41. First Attachment 41a Base plate 41b Mounting section on the erector side 41c Mounting part on the side of the stretchable force transmission member 41d retainer plate 42 Second Attachment 42a Base plate 42b Mounting section on the erector side 42c retaining plate BL Bolt NT Nut SG segment SG-1 Skin Plate SG-2 Main girder SG-3 Joint Plate SG-4 Vertical Rib SG-5 Hanging hand plate SG-5h hole TS tap screw h1~h6 Mounting holes

Claims

1. This is a shield tunneling machine that excavates underground and moves forward while assembling segments behind it. The front section where the cutter head is installed, A rear section having a rear inner cylindrical section in which multiple shield jacks, each with a spreader attached to its tip, are provided with the spreaders facing backward, and a rear outer cylindrical section that follows the rear inner cylindrical section, partially overlapping with the rear inner cylindrical section, and is movable in the axial direction of the excavation hole, Equipped with, The aforementioned rear outer cylinder portion includes, An annular first fixing member groove, a second fixing member groove, and a transmission member groove are formed on the inner circumferential surface, extending from front to rear along the entire circumference, A fixing member that detachably engages with the groove for the first fixing member to fix the rear body outer cylinder portion to the rear body inner cylinder portion in a first state in which the length of the rear body portion is relatively longer, and detachably engages with the groove for the second fixing member to fix the rear body outer cylinder portion to the rear body inner cylinder portion in a second state in which the length of the rear body portion is relatively shorter, An expansion / contraction force transmission member that detachably engages with the groove for the transmission member and fixes the spreader of the shield jack to the outer cylinder portion of the rear body, A spacer is provided which is attached to the segment side of the expansion / contraction force transmission member that is pushed by the shield jack, and which is interposed between the expansion / contraction force transmission member and the end face of the segment that forms the tunnel and is provided on the rear end side of the equipment body. The rear barrel inner section includes, An erector is provided which is attached to an intermediate ring body provided along the inner circumferential surface of the rear cylinder and is capable of rotatable along the circumferential direction of the rear cylinder, and which holds a segment with a detachably attached segment holding jig and rotates in the circumferential direction of the rear cylinder to transfer the segment to the assembly position in the inner circumferential direction of the rear cylinder. The aforementioned erector includes, The holding attachment capable of holding the aforementioned expansion / contraction force transmission member and the aforementioned spacer can be selectively attached to the segment holding jig. The force transmission member or the spacer is held by the retaining attachment and the erector is used to transport and install the force transmission member or the spacer to a predetermined installation location, or to remove it from the predetermined installation location. A shield tunneling machine characterized by the following features.

2. The aforementioned expansion and contraction force transmission member is made of steel material consisting of a main body with one side of a box-shaped cube as an opening, and a partition wall that divides the interior of the main body by spanning across two sides adjacent to and facing each other from the opening, wherein the partition wall is aligned with the axial direction of the rear body, and the opening is oriented toward the radial center of the rear body. The spacer is made of steel, consisting of a main body made of a plurality of cylindrical steel pipes arranged in parallel, end plates attached to both ends of the main body, and a base plate attached along the steel pipes of the main body, wherein the end plates face each other in the axial direction of the rear body, and the base plate is positioned facing the center of the rear body. The retaining attachments consist of a first attachment that holds the expansion / contraction force transmission member by screwing it onto the partition wall from both sides, and a second attachment that holds the spacer by screwing it onto the surface of the base plate in surface contact. The shield tunneling machine according to feature 1.

3. The aforementioned expansion and contraction force transmission member is such that the partition wall is screwed to the first attachment with bolts and nuts. The spacer is attached to the second attachment by screwing the base plate with tap screws. The shield tunneling machine according to feature 2.

4. The outer cylinder portion of the rear body is further provided with a buckling prevention member interposed between the shield jack and the segment after the shield jacks other than the shield jack pressed against the segment have been extended for a predetermined length of time when replacing the tail seal arranged along the inner circumferential surface of the inner cylinder portion of the rear body in the second state described above. The retaining attachment is further capable of holding the buckling prevention member. The buckling prevention member is held by the retaining attachment and the erector is used to transport and install the buckling prevention member to a predetermined installation location, or to remove it from the predetermined installation location. The shield tunneling machine according to feature 1.

5. The buckling prevention member is made of steel, consisting of a main body made of H-shaped steel and two end plates attached to both ends of the main body, wherein the end plates face each other in the axial direction of the rear body, and one flange constituting the main body is positioned facing the radial center of the rear body. The retaining attachment is a second attachment that is the same as the attachment that holds the spacer, and is screwed to the surface of the flange in surface contact to hold the buckling prevention member. The shield tunneling machine according to feature 4.

6. The buckling prevention member is such that the flange is screwed to the second attachment with bolts and nuts. The shield tunneling machine according to feature 5.

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