Shield tunnel construction method

Abstract

This prevents interference between the front shell of the shield tunneling machine and the jacking jacks during construction of curved sections of a shield tunnel. [Solution] The shield tunnel construction method uses a shield tunneling machine 1 having a front body 2 having a cutter head 5 on its front end, a rear body 3 connected to the rear end of the front body 2 and to which a plurality of jacking jacks 10 are attached, and a folding mechanism 4 that connects the front body 2 and the rear body 3 so as to bend. The shield tunnel construction method includes a jacking jack relocation step in which, prior to the construction of the curved section C in the shield tunnel, at least one of the plurality of jacking jacks 10 located on the opposite side (outside the curve) of the curved section C is moved backward relative to the front body 2 and the rear body 3.

Description

Technical Field

[0006] ,

[0001] The present invention relates to a method for constructing a shield tunnel using a shield tunneling machine having a mid-folding mechanism.

Background Art

[0002] As a shield tunneling machine used for constructing a shield tunnel, there is a mid-folding type that can construct a curved section of a shield tunnel. This is a machine in which the main body of the shield tunneling machine is divided into a front body and a rear body, and the front body and the rear body are connected by a mid-folding mechanism so as to be bendable. In this regard, Patent Document 1 discloses a mid-folding type shield tunneling machine that can be used for constructing a sharp curve section of a shield tunnel (sharp curve construction).

Prior Art Documents

[0007] According to the present invention, interference between the front shell of the shield tunneling machine and the jacking jack can be prevented during construction of curved sections of a shield tunnel. [Brief explanation of the drawing]

[0008] [Figure 1] A diagram showing the schematic configuration of a shield tunneling machine in one embodiment of the present invention. [Figure 2] A diagram showing the method of attaching the propulsion jack to the rear body in the above embodiment (a magnified view of part P in Figure 1). [Figure 3] A diagram showing the schematic configuration of the adapter in the above embodiment. [Figure 4] A partially enlarged view showing the folded state of the shield tunneling machine in the above embodiment. [Figure 5] A partially enlarged view showing the folded state of the shield tunneling machine in the above embodiment. [Figure 6] A partially enlarged view showing the folded state of the shield tunneling machine in the above embodiment. [Figure 7] This figure shows a schematic configuration of an example of a shield tunnel in the above embodiment. [Figure 8] Diagram showing the relocated propulsion jack in the above embodiment. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows a schematic configuration of a shield tunneling machine according to one embodiment of the present invention. In this embodiment, for convenience, the tunnel construction direction (tunnel excavation direction) is defined as the forward direction, and front, back, left, and right are defined accordingly. Also, in this embodiment, the configuration of the shield tunneling machine is explained using a so-called earth pressure balance type shield tunneling machine as an example, but the type of shield tunneling machine is not limited to this. Furthermore, in this embodiment, the following explanation assumes that the cross-sectional shape of the shield tunnel constructed by the shield tunneling machine is circular, but the cross-sectional shape of the shield tunnel is not limited to a circle; for example, it may be elliptical or rectangular.

[0010] The shield tunneling machine 1 is designed to accommodate the excavation of curved sections of shield tunnels. To achieve this, the cylindrical body (excavator body) is divided into a front section 2 and a rear section 3, which are connected via a folding mechanism 4. Specifically, the rear end of the front section 2 is connected to the front end of the rear section 3 via the folding mechanism 4, which connects the front section 2 and the rear section 3 in a foldable manner around a folding center O. Here, the folding center O can be located on the central axis of the front section 2 and the rear section 3. Furthermore, the skin plates positioned on the sides of the front section 2 and the skin plates positioned on the sides of the rear section 3 can each form the outer shell (steel shell) of the tunneling machine body.

[0011] The front section 2 has a cutter head 5 for excavation and a bulkhead 6. The cutter head 5 is located at the front end of the front section 2. The bulkhead 6 is located on the front section 2, spaced apart behind the cutter head 5. The cutter head 5 is rotatably supported by the bulkhead 6 and excavates the ground while rotating, driven by a drive motor 7 installed on the rear surface of the bulkhead 6.

[0012] Between the cutter head 5 and the partition wall 6, the chamber 8 is partitioned by these two components and the front drum 2. Excavated soil generated by excavation by the cutter head 5 accumulates within the chamber 8. The excavated soil in the chamber 8 is transported to the rear of the partition wall 6 via a soil removal mechanism (not shown).

[0013] The folding mechanism 4 comprises an overlapping portion 41 formed by overlapping the rear end of the front body 2 and the front end of the rear body 3, a seal 42 provided in the gap of the overlapping portion 41 between the front body 2 and the rear body 3, and a folding jack 43 connecting the front body 2 and the rear body 3. In this embodiment, a plurality of folding jacks 43 are arranged at intervals from each other in the circumferential direction of the front body 2 and the rear body 3.

[0014] The folding jack 43 is a hydraulic jack composed of, for example, a cylinder 43a and a rod 43b. The rear end of the cylinder 43a is fixed to the front end of the rear body 3, and the rod 43b can extend and retract at the front end. The front end of the rod 43b of the folding jack 43 is fixed to the front body 2. When the excavation direction of the shield tunneling machine 1 is changed or adjusted, the extension and shortening amounts of each folding jack 43 are changed or adjusted. For example, by shortening the left folding jack 43L (not shown) and extending the right folding jack 43R (not shown) of the two folding jacks 43 positioned on the left and right, the front body 2 bends to the left relative to the rear body 3. The greater the sum of the shortening amount of the left folding jack 43L and the extension amount of the right folding jack 43R, the greater the bend to the left. Similarly, by shortening the right folding jack 43R and extending the left folding jack 43L of the two folding jacks 43 positioned on the left and right, the front body 2 bends to the right relative to the rear body 3. The greater the sum of the shortening amount of the right folding jack 43R and the extension amount of the left folding jack 43L, the greater the bend to the right. The operation of the folding jacks 43 is similar for bending in the vertical direction.

[0015] The shield tunneling machine 1 includes an erector (not shown) inside the rear body 3. The erector can appropriately move the segment SG having an arc-shaped cross section in the tunnel diameter direction (inner and outer direction), the tunnel circumferential direction, and the tunnel axial direction while gripping the segment SG inside the rear part (tail part) of the rear body 3. The erector assembles the segment SG in the circumferential direction inside the rear part of the rear body 3 to form a cylindrical segment ring SR, and connects with the formed segment ring SR to construct a cylindrical lining body (shield tunnel).

[0016] The rear body 3 is provided with a tail seal 9 on the inner circumferential surface of its rear end. The tail seal 9 is in sliding contact with the outer peripheral part of the existing segment ring SR to block the gap between the inner circumferential surface of the rear end of the rear body 3 and the existing segment ring SR.

[0017] A plurality of propulsion jacks 10 are arranged at intervals in the circumferential direction of the rear body 3 on the peripheral edge of the rear body 3 so as not to interfere with the plurality of intermediate folding jacks 43. In the present embodiment, the following description will be made assuming that the number of the propulsion jacks 10 is 13 (see FIG. 8), but the number of the propulsion jacks 10 is not limited to this.

[0018] The propulsion jack 10 is, for example, a hydraulic jack composed of a cylinder 10a and a rod 10b. The front part of the cylinder 10a is located inside the front body 2, and the rear end part is fixed to the attachment part 30 at the front end of the rear body 3, and the rod 10b can advance and retract on the rear end side. In the present embodiment, by extending the propulsion jack 10 with the rear end part of the rod 10b of the propulsion jack 10 abutted against the existing segment ring SR via the spreader 10c, the shield tunneling machine 1 (tunneling machine main body) obtains propulsion force. Therefore, the propulsion jack 10 can push out the existing segment ring SR behind the rear part of the rear body 3, and by the reaction force, the shield tunneling machine 1 (tunneling machine main body) can be propelled forward.

[0019] Next, the installation of the propulsion jack 10 on the rear body 3 will be described using FIGS. 2 to 6 in addition to FIG. 1.

[0020] Figure 2 corresponds to a magnified view of part P in Figure 1 and shows the first to third methods of attaching the propulsion jack 10 to the rear body 3. Specifically, Figure 2(a) shows the first method, in which the propulsion jack 10 is directly attached to the attachment part 30 of the rear body 3; Figure 2(b) shows the second method, in which the propulsion jack 10 is attached to the attachment part 30 of the rear body 3 via one adapter 50; and Figure 2(c) shows the third method, in which the propulsion jack 10 is attached to the attachment part 30 of the rear body 3 via three adapters 50 (50α, 50β, 50γ).

[0021] Figure 3 shows the schematic configuration of the adapter 50. More specifically, Figure 3(a) is a side view of the adapter 50, and Figure 3(b) is a view taken along arrow A in Figure 3(a).

[0022] Figures 4 to 6 are enlarged partial views showing the folded state of the shield tunneling machine 1. Specifically, Figure 4 shows the folded state of the shield tunneling machine 1 in the first embodiment described above (see Figure 2(a)), Figure 5 shows the folded state of the shield tunneling machine 1 in the second embodiment described above (see Figure 2(b)), and Figure 6 shows the folded state of the shield tunneling machine 1 in the third embodiment described above (see Figure 2(c)). Here, the relationship between the folding angles θ1, θ2, and θ3 shown in Figures 4 to 6 is expressed by the following equation. θ1 < θ2 < θ3

[0023] As shown in Figures 2(a) to (c), the mounting portion 30 of the rear body 3 is provided at the front end of the rear body 3 and includes a plate-shaped wall portion 31 that protrudes radially inward from the front end of the rear body 3. A through hole (not shown) for inserting the cylinder 10a of the propulsion jack 10 is formed in the wall portion 31. A base portion 32 is provided on the rear surface of the wall portion 31 in the area surrounding this through hole.

[0024] In the first embodiment of the method for attaching the propulsion jack 10 to the rear body 3, as shown in Figure 2(a) (where the propulsion jack 10 is directly attached to the mounting portion 30 of the rear body 3), the flange portion 10f at the rear end of the cylinder 10a of the propulsion jack 10 is seated on the base portion 32 of the mounting portion 30 of the rear body 3. The flange portion 10f of the cylinder 10a of the propulsion jack 10 is then detachably fixed to the base portion 32 of the mounting portion 30 of the rear body 3 by bolt fastening.

[0025] In the second embodiment of the method for attaching the propulsion jack 10 to the rear body 3, shown in Figure 2(a) (when the propulsion jack 10 is attached to the mounting portion 30 of the rear body 3 via a single adapter 50), the front flange portion 52 of the adapter 50 is seated on the base portion 32 of the mounting portion 30 of the rear body 3, and is detachably fixed to the base portion 32 of the mounting portion 30 of the rear body 3 by bolt fastening. In addition, the rear flange portion 10f of the cylinder 10a of the propulsion jack 10 is in contact with the rear flange portion 52 of the adapter 50, and is detachably fixed to the rear flange portion 52 of the adapter 50 by bolt fastening.

[0026] As shown in Figures 3(a) and (b), the adapter 50, which is made of metal, for example, consists of a cylindrical body portion 51 and flange portions 52 provided at both ends of the body portion 51. The inner diameter of the body portion 51 is slightly larger than the outer diameter of the cylinder 10a of the propulsion jack 10, so that the cylinder 10a can be loosely fitted into the body portion 51. Through holes 53 are formed at each of the four corners of the flange portion 52, which has a roughly rectangular contour, for inserting the male threaded portion of a fastening bolt.

[0027] A key (not shown) is provided on the outer circumferential surface of the cylinder 10a of the propulsion jack 10, extending along the longitudinal direction of the cylinder 10a. To receive this key in the adapter 50, a slit 51a is formed in the main body 51 of the adapter 50, and notches 52a are formed in each flange portion 52. The presence of the slit 51a and notches 52a in the adapter 50 enhances the integration between the adapter 50 and the cylinder 10a of the propulsion jack 10. It goes without saying that a similar configuration to the slit 51a and notches 52a may also be applied to the through-hole in the wall portion 31 described above.

[0028] Furthermore, the adapter 50 may be provided with reinforcing members to reinforce the main body portion 51 and the pair of flange portions 52.

[0029] In the third embodiment of the method for attaching the propulsion jack 10 to the rear body 3, shown in Figure 2(c) (when the propulsion jack 10 is attached to the mounting portion 30 of the rear body 3 via three adapters 50 (50α, 50β, 50γ)), the front flange portion 52 of adapter 50α is seated on the base portion 32 of the mounting portion 30 of the rear body 3 and is detachably fixed to the base portion 32 of the mounting portion 30 of the rear body 3 by bolt fastening. The front flange portion 52 of adapter 50β is in contact with the rear flange portion 52 of adapter 50α and is detachably fixed to the rear flange portion 52 of adapter 50α by bolt fastening. The front flange portion 52 of adapter 50γ is in contact with the rear flange portion 52 of adapter 50β and is detachably fixed to the rear flange portion 52 of adapter 50β by bolt fastening. Furthermore, the flange portion 10f at the rear end of the cylinder 10a of the propulsion jack 10 is in contact with the rear flange portion 52 of the adapter 50γ, and is detachably fixed to the rear flange portion 52 of the adapter 50γ by bolt fastening.

[0030] As shown in Figures 2(a) and (b), by attaching the propulsion jack 10 to the mounting portion 30 of the rear body 3 via a single adapter 50, the mounting position of the propulsion jack 10 (position of the flange portion 10f) can be moved rearward relative to the rear body 3 by a distance M1 min (length of one adapter 50) within the rear body 3. As a result, the position of the front end of the cylinder 10a of the propulsion jack 10 moves rearward relative to the front body 2 by a distance M1 min (length of one adapter 50) within the front body 2. In this way, the propulsion jack 10 can be moved rearward relative to both the front body 2 and the rear body 3.

[0031] Furthermore, as shown in Figures 2(a) and (c), by attaching the propulsion jack 10 to the mounting portion 30 of the rear body 3 via three adapters 50 (50α, 50β, 50γ), the mounting position of the propulsion jack 10 (position of the flange portion 10f) can be moved rearward relative to the rear body 3 by a distance of M2 (the length of the three adapters 50) within the rear body 3. As a result, the position of the front end of the cylinder 10a of the propulsion jack 10 moves rearward relative to the front body 2 by a distance of M2 (the length of the three adapters 50) within the front body 2. In this way, the propulsion jack 10 can be moved rearward relative to both the front body 2 and the rear body 3.

[0032] Here, the relationship between distance M1 and distance M2 is expressed by the following equation. M1 <M2

[0033] In this embodiment, for example, when constructing a shield tunnel, first, the planned bending angle of the shield tunneling machine 1 is estimated based on the curvature of the curved section of the shield tunnel. Next, at this estimated bending angle, a jack 10 to be relocated is selected so as to prevent interference between the front body 2 and the cylinder 10a of the jack 10, and the amount of rearward relocation of the selected jack 10 (for example, the aforementioned distances M1, M2, etc.) is set. Then, adapters 50 can be prepared so that this set relocation amount can be achieved. In other words, the number and dimensions of the adapters 50 that can be prepared when constructing the shield tunnel (for example, the length L shown in Figure 3(a)) are arbitrary as long as the aforementioned relocation amount can be achieved. For example, the lengths L of each of the three adapters 50 (50α, 50β, 50γ) shown in Figure 2(c) may be the same or different as long as the aforementioned set relocation amount of the jack 10 (the aforementioned distance M2) can be achieved.

[0034] As shown in Figure 4, when the angle of inclination of the shield tunneling machine 1 is relatively small (θ1), even with the first method of attaching the propulsion jack 10 to the rear hull 3 (see Figure 2(a)), there is no risk of the cylinder 10a of the propulsion jack 10 interfering with the front hull 2.

[0035] On the other hand, as shown in Figure 5, if the angle of inclination of the shield tunneling machine 1 is θ2, which is greater than the aforementioned θ1, then in the first embodiment described above, there is a risk that the cylinder 10a of the propulsion jack 10 will interfere with the front body 2. Therefore, in order to prevent such interference, the second embodiment of the method for attaching the propulsion jack 10 to the rear body 3 (see Figure 2(a)) is adopted.

[0036] Furthermore, if the bending angle of the shield tunneling machine 1 is θ3, which is greater than the aforementioned θ2, then in the second embodiment described above, there is a risk that the cylinder 10a of the propulsion jack 10 will interfere with the front body 2. Therefore, in order to prevent such interference, a third embodiment of the method for attaching the propulsion jack 10 to the rear body 3 (see Figure 2(c)) is adopted.

[0037] Therefore, according to this embodiment, the larger the angle of inclination of the shield tunneling machine 1, the more the mounting position of the propulsion jack 10 (position of the flange portion 10f) can be moved further rearward relative to the rear body 3 within the rear body 3, and consequently, the propulsion jack 10 can be moved further rearward relative to the front body 2 and the rear body 3. Furthermore, the further rearward the propulsion jack 10 is moved, the smaller the extension amount of the propulsion jack 10 can be reduced, thereby suppressing the occurrence of twisting of the propulsion jack 10, and consequently, suppressing the occurrence of vibrations in the propulsion jack 10 and the entire shield tunneling machine 1 caused by such twisting.

[0038] Next, an example of shield tunnel construction using the shield tunneling machine 1 will be explained using Figures 7 and 8, in addition to Figures 1 to 6 mentioned above. Figure 7 is a schematic diagram (plan view) showing an example of a shield tunnel constructed by a shield tunneling machine 1. Figures 8(a) and 8(b) show the arrangement of 13 jacking jacks 10 inside the rear body 3 when viewed toward the face in the QQ section of Figure 1, and each of the 13 jacking jacks 10 is represented by the symbols J1 to J13. Figure 8(a) shows the normal state in which each of the jacking jacks J1 to J13 is installed in its regular position, and Figure 8(b) shows the relocated state in which each of the jacking jacks J1, J2, J7 to J13 is installed in its regular position, and each of the jacking jacks J3 to J6 is moved backward from its regular position.

[0039] In this embodiment, as shown in Figure 7, in the shield tunnel, the first straight section S1, the first transition section T1, the curved section C, the second transition section T2, and the second straight section S2 are arranged in order from the rear to the front in the direction of tunnel construction. In each of the sections of the first straight section S1, the first transition section T1, the curved section C, the second transition section T2, and the second straight section S2, the segment SG is assembled by the shield tunneling machine 1 to form the segment ring SR. The tunnel centerline F shown in Figure 7 corresponds to the tunnel axis and is located at the center of the tunnel alignment.

[0040] The first straight section S1 is a section that extends in a straight line and is formed by connecting multiple segment rings SR1 in the direction of tunnel construction. The segment rings SR1 in the first straight section S1 are made of, for example, RC segments (reinforced concrete segments).

[0041] The second straight section S2 is a section that extends in a straight line, and is formed by connecting multiple segment rings SR2 in the direction of tunnel construction. The segment rings SR2 in the second straight section S2 are made of, for example, RC segments.

[0042] In this embodiment, the outer diameter of segment ring SR1 in the first straight section S1 is approximately equal to the outer diameter of segment ring SR2 in the second straight section S2. However, the outer diameter of segment ring SR1 in the first straight section S1 and the outer diameter of segment ring SR2 in the second straight section S2 may be different from each other.

[0043] In this embodiment, the width of one segment ring SR1 in the first straight section S1 (length in the direction of tunnel construction) is approximately equal to the width of one segment ring SR2 in the second straight section S2. However, the width of one segment ring SR1 in the first straight section S1 and the width of one segment ring SR2 in the second straight section S2 may be different from each other.

[0044] Curved section C is a section that extends in a curved (arc-shaped) manner centered on the curve center CC, and is formed by connecting multiple segment rings SR3 in the direction of tunnel construction. In this embodiment, as shown in Figure 7, curved section C is a left curve section and is a sharp curve section. Therefore, in this embodiment, the inside of the curve (left side) corresponds to the "curved side of the curved section" of the present invention, and the outside of the curve (right side) corresponds to the "side opposite to the curved side of the curved section."

[0045] The segment ring SR3 in curved section C is composed of so-called tapered segments. When viewed from above, the inner side (left side) of the segment ring SR3 is shorter than the outer side (right side). The segment ring SR3 in the curved section C is composed of, for example, at least one of a steel segment, a concrete-filled steel segment (SSPC segment), and a composite segment.

[0046] The outer diameter of segment ring SR3 in curved section C is smaller than the outer diameter of segment ring SR1 in the first straight section S1, and also smaller than the outer diameter of segment ring SR2 in the second straight section S2. Preferably, the inner diameter of segment ring SR3 in curved section C is the same as the inner diameter of segment ring SR1 in the first straight section S1, and also the same as the inner diameter of segment ring SR2 in the second straight section S2, but these inner diameters may be different from each other.

[0047] The width of one ring of segment ring SR3 in curved section C (length in the direction of tunnel construction) is smaller than the width of one ring of segment ring SR1 in the first straight section S1, and also smaller than the width of one ring of segment ring SR2 in the second straight section S2. Here, the width of one ring of segment ring SR3 is preferably within the range of 20-65% of the width of one ring of segment rings SR1 and SR2, and more preferably within the range of 23-52%. Here, with respect to segment ring SR3 in curved section C, "width of one ring" refers to the width of the central part of segment ring SR3, in other words, the width of segment ring SR3 along the tunnel axis. In this regard, with respect to the aforementioned segment rings SR1 and SR2, and the segment rings SR10-SR12 and SR20-SR22 described later, "width of one ring" can also refer to the width of the central part of the segment ring, in other words, the width of the segment ring along the tunnel axis.

[0048] The first transition section T1 includes at least the first outer diameter adjustment segment ring SR10. The first outer diameter adjustment segment ring SR10 has an outer surface that is inclined such that its rear end corresponds to the outer diameter of segment ring SR1 in the first straight section S1 and its front end corresponds to the outer diameter of segment ring SR3 in the curved section C. This outer surface has a shape like the side of a frustocone that tapers from the rear to the front, or in other words, it is trumpet-shaped that widens from the front to the rear. The first outer diameter adjustment segment ring SR10 has the role of eliminating the step between segment rings SR1 and SR3. By eliminating this step with the first outer diameter adjustment segment ring SR10, damage to the segments constituting segment rings SR1 and SR3 can be prevented, and damage to the tail brush constituting the tail seal 9 of the shield tunneling machine 1 can also be prevented.

[0049] The width of one ring of the first outer diameter adjustment segment ring SR10 (length in the direction of tunnel construction) is smaller than the width of one ring of segment ring SR1 in the first straight section S1, and also smaller than the width of one ring of segment ring SR2 in the second straight section S2.

[0050] The first outer diameter adjustment segment ring SR10 is composed of, for example, at least one of a steel segment, a concrete-filled steel segment, and a composite segment.

[0051] The first transition section T1 may further include at least one first transition segment ring SR11 positioned between the front end segment ring SR1 and the rear end of the first outer diameter adjusting segment ring SR10 in the first straight section S1. The outer diameter of the first transition segment ring SR11 is approximately equal to the outer diameter of the segment ring SR1 in the first straight section S1.

[0052] The width of one ring of the first transition segment ring SR11 (length in the direction of tunnel construction) is smaller than the width of one ring of segment ring SR1 in the first straight section S1, and also smaller than the width of one ring of segment ring SR2 in the second straight section S2.

[0053] In the first transition section T1, the length of the section T11 where the first transition segment ring SR11 is formed (length in the direction of tunnel construction) is preferably 0 to 1 unit length of the shield tunneling machine 1, for example, with the length of the machine body (front drum 2 + rear drum 3) of the shield tunneling machine 1 being defined as 1 unit length.

[0054] The first transition segment ring SR11 is composed of, for example, at least one of a steel segment, a concrete-filled steel segment, and a composite segment.

[0055] The first transition section T1 may further include at least one second transition segment ring SR12 positioned between the front end of the first outer diameter adjustment segment ring SR10 and the rear end of the segment ring SR3 in the curved section C. The outer diameter of the second transition segment ring SR12 is approximately equal to the outer diameter of the segment ring SR3 in the curved section C.

[0056] The width of one ring of the second transition segment ring SR12 (length in the direction of tunnel construction) is smaller than the width of one ring of segment ring SR1 in the first straight section S1, and also smaller than the width of one ring of segment ring SR2 in the second straight section S2. Furthermore, the width of one ring of the second transition segment ring SR12 is smaller than the width of one ring of the first outer diameter adjustment segment ring SR10. Moreover, the width of one ring of the second transition segment ring SR12 is approximately equal to the width of one ring of segment ring SR3 in the curved section C.

[0057] In the first transition section T1, the length of section T12 where the second transition segment ring SR12 is formed (length in the direction of tunnel construction) is preferably the length of 0 to 1 unit length of the shield tunneling machine 1.

[0058] The second transition segment ring SR12 is composed of, for example, at least one of a steel segment, a concrete-filled steel segment, and a composite segment.

[0059] The length of the first transition section T1 (length in the direction of tunnel construction) which may include the first outer diameter adjustment segment ring SR10, the first transition segment ring SR11, and the second transition segment ring SR12 is preferably the length of 0 to 1 unit length of the shield tunneling machine 1, and more preferably the length of 0.5 to 1 unit length of the shield tunneling machine 1.

[0060] The inner diameters of the first outer diameter adjustment segment ring SR10, the first transition segment ring SR11, and the second transition segment ring SR12, which constitute the first transition section T1, are preferably the same, but their inner diameters may be different. Furthermore, while it is preferable that the inner diameters of the first outer diameter adjustment segment ring SR10, the first transition segment ring SR11, and the second transition segment ring SR12, which constitute the first transition section T1, are the same as the inner diameters of the segment rings SR1, SR2, and SR3, these inner diameters may be different from each other.

[0061] In this embodiment, the first transition segment ring SR11, the first outer diameter adjustment segment ring SR10, and the second transition segment ring SR12 are arranged in a straight line in the first transition section T1. Also, in this embodiment, the first straight section S1 and the first transition section T1 are arranged in a straight line. However, the first transition section T1 does not necessarily extend in a straight line, and may extend in a curved shape with a curvature that is much smaller than that of the curved section C.

[0062] The second transition section T2 includes at least the second outer diameter adjustment segment ring SR20. The second outer diameter adjustment segment ring SR20 has an outer surface that is inclined such that its rear end corresponds to the outer diameter of segment ring SR3 in the curved section C, and its front end corresponds to the outer diameter of segment ring SR2 in the second straight section S2. This outer surface has a shape like the side of a frustocone that tapers from the front to the rear, or in other words, it is trumpet-shaped that widens from the rear to the front. The second outer diameter adjustment segment ring SR20 serves to eliminate the step between segment rings SR2 and SR3. By eliminating this step with the second outer diameter adjustment segment ring SR20, damage to the segments constituting segment rings SR2 and SR3 can be prevented, and damage to the tail brush constituting the tail seal 9 of the shield tunneling machine 1 can also be prevented.

[0063] The width of one ring of the second outer diameter adjustment segment ring SR20 (length in the direction of tunnel construction) is smaller than the width of one ring of segment ring SR1 in the first straight section S1, and also smaller than the width of one ring of segment ring SR2 in the second straight section S2.

[0064] The second outer diameter adjustment segment ring SR20 is composed of, for example, at least one of a steel segment, a concrete-filled steel segment, and a composite segment.

[0065] The second transition section T2 may further include at least one third transition segment ring SR21 positioned between the front segment ring SR3 in the curved section C and the rear end of the second outer diameter adjustment segment ring SR20. The outer diameter of the third transition segment ring SR21 is approximately equal to the outer diameter of the segment ring SR3 in the curved section C.

[0066] The width of one ring of the third transition segment ring SR21 (length in the direction of tunnel construction) is smaller than the width of one ring of segment ring SR1 in the first straight section S1, and also smaller than the width of one ring of segment ring SR2 in the second straight section S2. Furthermore, the width of one ring of the third transition segment ring SR21 is smaller than the width of one ring of the second outer diameter adjustment segment ring SR20. Moreover, the width of one ring of the third transition segment ring SR21 is approximately equal to the width of one ring of segment ring SR3 in the curved section C.

[0067] In the second transition section T2, the length of section T21 where the third transition segment ring SR21 is formed (length in the direction of tunnel construction) is preferably the length of 0 to 1 unit length of the shield tunneling machine 1.

[0068] The third transition segment ring SR21 is composed of, for example, at least one of a steel segment, a concrete-filled steel segment, and a composite segment.

[0069] The second transition section T2 may further include at least one fourth transition segment ring SR22 positioned between the front end of the second outer diameter adjustment segment ring SR20 and the segment ring SR2 at the rear end of the second straight section S2. The outer diameter of the fourth transition segment ring SR22 is approximately equal to the outer diameter of the segment ring SR2 in the second straight section S2.

[0070] The width of one ring of the fourth transition segment ring SR22 (length in the direction of tunnel construction) is smaller than the width of one ring of segment ring SR2 in the first straight section S1, and also smaller than the width of one ring of segment ring SR2 in the second straight section S2.

[0071] In the second transition section T2, the length of section T22 where the fourth transition segment ring SR22 is formed (length in the direction of tunnel construction) is preferably the length of 0 to 1 unit length of the shield tunneling machine 1.

[0072] The fourth transition segment ring SR22 is composed of, for example, at least one of a steel segment, a concrete-filled steel segment, and a composite segment.

[0073] The length of the second transition section T2 (length in the direction of tunnel construction) which may include the second outer diameter adjustment segment ring SR20, the third transition segment ring SR21, and the fourth transition segment ring SR22 is preferably the length of 0 to 1 unit length of the shield tunneling machine 1, and more preferably the length of 0.5 to 1 unit length of the shield tunneling machine 1.

[0074] The inner diameters of the second outer diameter adjustment segment ring SR20, the third transition segment ring SR21, and the fourth transition segment ring SR22, which constitute the second transition section T2, are preferably the same, but their inner diameters may be different. Furthermore, while it is preferable that the inner diameters of the second outer diameter adjustment segment ring SR20, the third transition segment ring SR21, and the fourth transition segment ring SR22, which constitute the second transition section T2, are the same as the inner diameters of the segment rings SR1, SR2, and SR3, these inner diameters may be different from each other.

[0075] In this embodiment, the third transition segment ring SR21, the second outer diameter adjustment segment ring SR20, and the fourth transition segment ring SR22 are aligned in a straight line in the second transition section T2. ​​Also, in this embodiment, the second transition section T2 and the second straight section S2 are aligned in a straight line. However, the second transition section T2 does not necessarily extend in a straight line; it may extend in a curved shape with a curvature that is much smaller than that of the curved section C.

[0076] Next, we will explain the construction method for a shield tunnel using the shield tunneling machine 1. In this construction method, first, the first straight section S1 is constructed in the direction of tunnel construction using the shield tunneling machine 1. During the construction of this first straight section S1, the jacking jacks J1 to J13 are in the normal state shown in Figure 8(a), all installed in their regular positions and none have been moved to the rear. Here, in the aforementioned normal state, each of the jacking jacks J1 to J13 is in the first form of the method of attaching the jacking jack 10 to the rear body 3, as shown in Figure 2(a) above (when the jacking jack 10 is directly attached to the attachment part 30 of the rear body 3).

[0077] When construction of the first straight section S1 is completed and the shield tunneling machine 1 approaches the first transition section T1, in the first transition section T1, as shown in Figure 8(a), the mounting positions (position of flange portion 10f) of the jacking jacks J3 to J6, which are located on the outside (right side) of the curve, are moved rearward within the rear body 3 relative to the rear body 3. In other words, the jacking jacks J3 to J6 are moved rearward relative to the front body 2 and the rear body 3. For this relocation, for example, the third form of the method for attaching the jacking jack 10 to the rear body 3 shown in Figure 2(c) above (when the jacking jack 10 is attached to the mounting portion 30 of the rear body 3 via three adapters 50 (50α, 50β, 50γ)) can be used. This relocation process corresponds to the "jacking jack relocation process" of the present invention. This relocation process is carried out prior to the construction of the curved section C. This relocation process can be carried out at any point within the first transition section T1. Preferably, this relocation process is carried out within the first transition section T1, for example, prior to the formation of the second transition segment ring SR12.

[0078] Following the construction of the first transition section T1, the shield tunneling machine 1 is used to proceed with the construction of the curved section C in the direction of tunnel construction. During the construction of this curved section C, the jacking jacks J3 to J6 are in the relocated state shown in Figure 8(a), while the remaining jacking jacks J1, J2, J7 to J13 remain in their original positions and have not been moved to the rear. Also, during the construction of this curved section C, the shield tunneling machine 1 is in the folded state shown in Figure 6, but because the jacking jacks J3 to J6 are moved to the rear, the cylinders 10a of each jacking jack J3 to J6 do not interfere with the front shell 2.

[0079] When construction of the curved section C is completed and the shield tunneling machine 1 approaches the second transition section T2, the jacking jacks J3 to J6 are returned to their original positions (regular positions) in the second transition section T2, returning to the normal state shown in Figure 8(a). This return process corresponds to the "jacking jack return process" of the present invention. This return process may include, for example, removing the three adapters 50 (50α, 50β, 50γ) from the third method of attaching the jacking jack 10 to the rear body 3 shown in Figure 2(c) above (when the jacking jack 10 is attached to the attachment part 30 of the rear body 3 via three adapters 50 (50α, 50β, 50γ)) and returning to the first method of attaching the jacking jack 10 to the rear body 3 shown in Figure 2(a) above (when the jacking jack 10 is directly attached to the attachment part 30 of the rear body 3). This return process can be performed at any point within the second transition section T2. ​​Preferably, this return process is performed within the second transition section T2, for example, prior to the formation of the second outer diameter adjustment segment ring SR20.

[0080] Following the construction of the second transition section T2, the construction of the second straight section S2 will proceed using the shield tunneling machine 1 in the direction of tunnel construction. During the construction of this second straight section S2, the jacking jacks J1 to J13 are in the normal state shown in Figure 8(a), all installed in their regular positions and none have been moved to the rear.

[0081] As described above, by using the shield tunneling machine 1 to proceed with construction in the order of the first straight section S1, the first transition section T1, the curved section C, the second transition section T2, and the second straight section S2, it is possible to construct a shield tunnel including the curved section C, which is a sharp curve.

[0082] According to this embodiment, the shield tunneling method uses a shield tunneling machine 1 having a front body 2 having a cutter head 5 on its front end, a rear body 3 connected to the rear end of the front body 2 and to which a plurality of jacking jacks 10 (J1 to J13) are attached, and a folding mechanism 4 that connects the front body 2 and the rear body 3 in a foldable manner. The shield tunneling method includes a jacking jack relocation step in which, prior to the construction of the curved section C in the shield tunnel, at least one of the plurality of jacking jacks J1 to J13 located on the side opposite to the curved side (outside the curve) of the curved section C (jacking jacks J3 to J6 in this embodiment) is moved backward relative to the front body 2 and the rear body 3. This prevents interference between the front body 2 and the jacking jacks 10 (jacking jacks J3 to J6 in this embodiment) of the shield tunneling machine 1 when constructing the curved section C of the shield tunnel.

[0083] Furthermore, according to this embodiment, in a shield tunnel, a first straight section S1, a first transition section T1, and a curved section C are arranged in order from the rear to the front in the direction of tunnel construction, and segments SG are assembled in each section to form a segment ring SR, the outer diameter of the segment ring SR3 in the curved section C is smaller than the outer diameter of the segment ring SR1 in the first straight section S1, the width of one ring of the segment ring SR3 in the curved section C is smaller than the width of one ring of the segment ring SR1 in the first straight section S1, the first transition section T1 includes a first outer diameter adjustment segment ring SR10, and the first outer diameter adjustment segment ring SR10 has an outer surface that is inclined such that its rear end corresponds to the outer diameter of the segment ring SR1 in the first straight section S1 and its front end corresponds to the outer diameter of the segment ring SR3 in the curved section C. In this way, the construction from the first straight section S1 to the curved section C can be optimized.

[0084] Furthermore, according to this embodiment, the first transition section T1 has the following configurations (A) to (D). (A) The first transition section T1 further includes at least one first transition segment ring SR11 positioned between the front end segment ring SR1 in the first straight section S1 and the rear end of the first outer diameter adjusting segment ring SR10, wherein the outer diameter of the first transition segment ring SR11 is approximately equal to the outer diameter of the segment ring SR1 in the first straight section S1. (B) The first transition section T1 further includes at least one second transition segment ring SR12 positioned between the front end of the first outer diameter adjustment segment ring SR10 and the rear end of the segment ring SR3 in the curved section C, wherein the outer diameter of the second transition segment ring SR12 is approximately equal to the outer diameter of the segment ring SR3 in the curved section C. (C) The first straight section S1 and the first transition section T1 are aligned in a straight line. (D) The width of one segment ring of segment rings SR10, SR11, and SR12 that constitute the first transition section T1 is smaller than the width of one segment ring of segment ring SR1 in the first straight section S1, and the aforementioned propulsion jack relocation process is carried out in the first transition section T1. With respect to the first transition section T1, the aforementioned configurations (A) to (D) allow for efficient preparation for sharp curve construction (including the relocation of the aforementioned propulsion jack 10 to the rear) in the first transition section T1.

[0085] Furthermore, according to this embodiment, the first straight section S1 is composed of RC segments, the first transition section T1 is composed of at least one of steel segments, concrete-filled steel segments, and composite segments, and the curved section C is composed of at least one of steel segments, concrete-filled steel segments, and composite segments. In other words, by using at least one of steel segments, concrete-filled steel segments, and composite segments in sections of the shield tunnel where the outer diameter may be reduced and the segment thickness may be thinned, sufficient strength can be ensured in those sections.

[0086] Furthermore, according to this embodiment, in a shield tunnel, a first straight section S1, a first transition section T1, a curved section C, a second transition section T2, and a second straight section S2 are arranged in order from the rear to the front in the direction of tunnel construction. In each section, a segment SG is assembled to form a segment ring SR. The outer diameter of the segment ring SR3 in the curved section C is smaller than the outer diameter of the segment ring SR2 in the second straight section S2, and the width of one ring of the segment ring SR3 in the curved section C is smaller than the width of one ring of the segment ring SR1 in the second straight section S2. The second transition section T2 includes a second outer diameter adjustment segment ring SR20, and the second outer diameter adjustment segment ring SR20 has an outer surface that is inclined such that its rear end corresponds to the outer diameter of the segment ring SR3 in the curved section C and its front end corresponds to the outer diameter of the segment ring SR2 in the second straight section S2. In this way, the construction from the curved section C to the second straight section S2 can be optimized.

[0087] Furthermore, according to this embodiment, the second transition section T2 has the following configurations (E) to (H). (E) The second transition section T2 further includes at least one third transition segment ring SR21 positioned between the front segment ring SR3 in the curved section C and the rear end of the second outer diameter adjustment segment ring SR20, wherein the outer diameter of the third transition segment ring SR21 is approximately equal to the outer diameter of the segment ring SR3 in the curved section C. (F) The second transition section T2 further includes at least one fourth transition segment ring SR22 positioned between the front end of the second outer diameter adjustment segment ring SR20 and the rear end of the segment ring SR2 in the second straight section S2, wherein the outer diameter of the fourth transition segment ring SR22 is approximately equal to the outer diameter of the segment ring SR2 in the second straight section S2. (G) The second transition section T2 and the second straight section S2 are aligned in a straight line. (H) The construction method for the shield tunnel further includes a jacking jack return process in which the jacking jacks 10 (jacking jacks J3 to J6 in this embodiment) that were moved in the jacking jack relocation process described above are returned to their original positions before relocation, and the width of one segment ring of the segment rings SR20, SR21, and SR22 that constitute the second transition section T2 is smaller than the width of one segment ring of the segment ring in the second straight section S2, and the jacking jack return process described above is performed in the second transition section T2. With respect to the second transition section T2, the configurations (E) to (H) described above allow for efficient return of the jacking jack 10 after sharp curve construction in the second transition section T2.

[0088] Furthermore, according to this embodiment, the second transition section T2 is composed of at least one of a steel segment, a concrete-filled steel segment, and a composite segment, and the second straight section S2 is composed of an RC segment. In other words, by using at least one of a steel segment, a concrete-filled steel segment, and a composite segment in a section of the shield tunnel where the outer diameter may be reduced and the segment thickness may be thinned, sufficient strength can be ensured in that section.

[0089] It should be noted that the illustrated embodiments are merely illustrative of the present invention, and the present invention encompasses not only those directly shown by the described embodiments, but also various improvements and modifications made by those skilled in the art within the scope of the claims. [Explanation of symbols]

[0090] 1...Shield tunneling machine, 2...Front body, 3...Rear body, 4...Articulated mechanism, 5...Cutter head, 6...Bulkhead, 7...Drive motor, 8...Chamber, 9...Tail seal, 10...Propulsion jack, 10a...Cylinder, 10b...Rod, 10c...Spreader, 10f...Flange section, 30...Mounting section, 31...Wall section, 32...Base section, 41...Lap section, 42...Seal, 43...Articulated jack, 43a...Cylinder, 43b...Rod, 50, 50α, 50β, 50γ...Adapter, 51...Main body section, 51a...Slit, 52...Flange section, 52a...Notch section, 53...Through hole, C...Curved section, CC...Center of curve, F...Ton J1~J13…Push jack, L…Length, M1, M2…Distance, O…Center of bending, S1…First straight section, S2…Second straight section, SG…Segment, SR, SR1, SR2, SR3…Segment ring, SR10…First outer diameter adjustment segment ring, SR11…First transition segment ring, SR12…Second transition segment ring, SR20…Second outer diameter adjustment segment ring, SR21…Third transition segment ring, SR22…Fourth transition segment ring, T1…First transition section, T2…Second transition section, T11, T12, T21, T22…Section, θ1, θ2, θ3…Bending angle

Claims

1. A front section having a cutter head at the front end, A rear section connected to the rear end of the front section and to which multiple propulsion jacks are attached, A folding mechanism connects the front and rear sections in a foldable manner, A method for constructing a shield tunnel using a shield tunneling machine having, A method for constructing a shield tunnel, comprising a jack relocation step of relocating at least one of the plurality of jacking jacks located on the side opposite to the curve of the curved section to the rear of the front and rear sections of the shield tunnel, prior to construction of the curved section of the shield tunnel.

2. In the shield tunnel, a first straight section, a first transition section, and the curved section are arranged in order from the rear to the front in the direction of tunnel construction, and segments are assembled in each section to form a segment ring. The outer diameter of the segment ring in the curved section is smaller than the outer diameter of the segment ring in the first straight section. The width of one segment ring in the curved section is smaller than the width of one segment ring in the first straight section. The method for constructing a shield tunnel according to claim 1, wherein the first transition section includes a first outer diameter adjustment segment ring, and the first outer diameter adjustment segment ring has an outer surface that is inclined such that its rear end corresponds to the outer diameter of the segment ring in the first straight section and its front end corresponds to the outer diameter of the segment ring in the curved section.

3. The method for constructing a shield tunnel according to claim 2, wherein the first transition section further includes at least one transition segment ring disposed between the front end of the first outer diameter adjustment segment ring and the segment ring at the rear end of the curved section, and the outer diameter of the transition segment ring is substantially equal to the outer diameter of the segment ring in the curved section.

4. The method for constructing a shield tunnel according to claim 2 or claim 3, wherein the first straight section and the first transition section are aligned in a straight line.

5. The width of one segment ring constituting the first transition section is smaller than the width of one segment ring in the first straight section. The method for constructing a shield tunnel according to claim 2 or claim 3, wherein the propulsion jack relocation step is performed in the first transition section.

6. The first straight section is composed of RC segments, The first transition section is composed of at least one of a steel segment, a concrete-filled steel segment, and a composite segment. The method for constructing a shield tunnel according to claim 2 or 3, wherein the curved section is composed of at least one of a steel segment, a concrete-filled steel segment, and a composite segment.

7. In the shield tunnel, the first straight section, the first transition section, the curved section, the second transition section, and the second straight section are arranged in order from the rear to the front in the direction of tunnel construction, and segments are assembled in each section to form a segment ring. The outer diameter of the segment ring in the curved section is smaller than the outer diameter of the segment ring in the second straight section. The width of one segment ring in the curved section is smaller than the width of one segment ring in the second straight section. The method for constructing a shield tunnel according to claim 2, wherein the second transition section includes a second outer diameter adjustment segment ring, and the second outer diameter adjustment segment ring has an outer surface that is inclined such that its rear end corresponds to the outer diameter of the segment ring in the curved section and its front end corresponds to the outer diameter of the segment ring in the second straight section.

8. The process further includes a propulsion jack return step, in which the propulsion jack that was moved in the propulsion jack relocation step is returned to its original position before the relocation, The width of one segment ring in the second transition section is smaller than the width of one segment ring in the second straight section. The method for constructing a shield tunnel according to claim 7, wherein the jacking jack return process is performed in the second transition section.

9. The second transition section is composed of at least one of a steel segment, a concrete-filled steel segment, and a composite segment. The method for constructing a shield tunnel according to claim 7 or claim 8, wherein the second straight section is composed of RC segments.

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