Method for constructing a shield tunnel

Abstract

To take measures to prevent a shield tunnel from rising, immediately after constructing a segment ring.SOLUTION: A construction method of a shield tunnel comprises constructing a segment ring SR by assembling a plurality of segments SP within a cylindrical skin plate 2 of a shield machine 1, and installing a first weight member (for example, side ingots 250L, 250R) on the segment ring SR within the skin plate 2. Preferably, the first weight member is installed on the segment ring SR using an erector device 5. The first weight member is preferably made of metal or a synthetic structure of metal and inorganic material.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a method for constructing a shield tunnel and the internal structure of a shield tunnel.

Background Art

[0002] A shield tunnel used as a pipeline for sewerage, utility tunnels, roads, railways, etc. is constructed by the shield method. In the shield method, a shield tunneling machine is used. The shield tunneling machine includes, for example, a cylindrical skin plate forming the outer shell of the tunneling machine body, a cutter head provided at the front end (face side end) of the skin plate for excavating the ground, and a propulsion jack provided inside the skin plate.

[0003] In the shield method, for example, a launch shaft and a reception shaft are constructed in the ground, and while excavating the ground with a shield tunneling machine from the launch shaft toward the reception shaft, segments (segment pieces) are successively assembled in the circumferential direction of the tunnel using an erector device inside the rear part (tail part) of the skin plate to construct a segment ring, and adjacent segment rings are connected in the tunnel axis direction to construct a cylindrical lining structure. In this method, the shield tunneling machine presses the existing segment ring behind it backward with the propulsion jack, and advances while excavating the ground by the thrust generated as a reaction force.

[0004] By the way, when a large buoyancy acts on the shield tunnel due to a groundwater level higher than that of the shield tunnel, it is necessary to prevent the shield tunnel from floating due to this buoyancy. In this regard, Patent Document 1 discloses an example of a method for preventing the shield tunnel from floating. In Patent Document 1, counterweight trolleys are arranged on both the left and right sides inside the lining structure behind the shield tunneling machine, and heavy objects such as concrete blocks are installed behind the counterweight trolleys inside the lining structure.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the technology disclosed in Patent Document 1, there is a problem that there is a period of time from when the segment ring is assembled in the skin plate until the counterweight carriage is arranged on the segment ring.

[0007] In view of such a situation, an object of the present invention is to promptly take measures against the floating of the shield tunnel after the construction of the segment ring.

Means for Solving the Problems

[0008] Therefore, in the first aspect of the present invention, the method for constructing a shield tunnel includes assembling a plurality of segments within the cylindrical skin plate of a shield tunneling machine to construct a segment ring, and installing a first weight member made of metal or a composite structure of metal and an inorganic material on the segment ring within the skin plate. , using the erector device of the shield tunneling machine by assembling a plurality of segments 、 to construct a segment ring and connecting adjacent segment rings in the tunnel axis direction to construct a cylindrical lining and, within the skin plate using the erector device installing a first weight member made of metal or a composite structure of metal and an inorganic material on the segment ring. The shield tunneling machine presses the segment ring with the first hammer member installed backward with the propulsion jack of the shield tunneling machine, and advances while excavating the ground by the thrust generated as the reaction force. Here, the first hammer member does not constitute the lining.

[0009] In the second aspect of the present invention, the The construction method includes constructing a segment ring by assembling a plurality of segments using the erector device of the shield tunneling machine within the cylindrical skin plate of the shield tunneling machine, and installing a first hammer member made of metal or a composite structure of metal and inorganic materials on the segment ring using the erector device within the skin plate. The first hammer member is installed in a portion avoiding the central portion in the width direction at the bottom of the tunnel . The shield tunneling machine presses the segment ring with the first hammer member installed backward with the propulsion jack of the shield tunneling machine, and advances while excavating the ground by the thrust generated as the reaction force. The first hammer member includes a first portion that is a portion closer to the center in the width direction of the tunnel bottom and a second portion that is a portion farther from the center in the width direction of the tunnel bottom than the first portion, and the thickness of the first portion is smaller than the thickness of the second portion. In the third aspect of the present invention, the construction method of the shield tunnel includes constructing a segment ring by assembling a plurality of segments within the cylindrical skin plate of the shield tunneling machine, and installing a first hammer member made of metal or a composite structure of metal and inorganic materials on the segment ring using the erector device within the skin plate, and installing a second hammer member made of metal or a composite structure of metal and inorganic materials on the segment ring between the shield tunneling machine and a following carriage that moves in accordance with the excavation in the tunnel axis direction of the shield tunneling machine or on the following carriage, and further includes installing a concrete floor slab member at the center in the width direction of the tunnel bottom. Here, the second hammer member is installed at the center in the width direction of the tunnel bottom.

Effects of the Invention

[0010] The first of the present invention ~ 3 According to an aspect, a first weight member made of metal or a composite structure of metal and an inorganic material is installed in a segment ring within the skin plate of a shield tunneling machine. Therefore, after constructing the segment ring within the skin plate, the first weight member can be immediately installed on the segment ring. Accordingly, after the construction of the segment ring, countermeasures against the uplift of the shield tunnel can be promptly taken.

[0011] Also, regarding the central portion in the width direction at the bottom of the tunnel, generally, due to the layout of the shield tunneling machine, the equipment is intricate. In this regard, according to the second aspect of the present invention, the first weight member made of metal or a composite structure of metal and an inorganic material is installed in a portion avoiding the central portion in the width direction at the bottom of the tunnel. Therefore, interference between the equipment of the shield tunneling machine and the first weight member installed at the bottom of the tunnel can be prevented.

Brief Description of the Drawings

[0012] [Figure 1] Cross-sectional view along the tunneling direction of a shield tunnel in an embodiment of the present invention [Figure 2] Cross-sectional views A-A and B-B of FIG. 1 [Figure 3] Diagram showing a method for constructing a floor slab [Figure 4] Diagram showing a method for constructing a floor slab [Figure 5] Diagrams showing the first to third modified examples of the floor slab [Figure 6] Diagrams showing the fourth and fifth modified examples of the floor slab [Figure 7] Diagram showing an example of countermeasures against the uplift of a shield tunnel [Figure 8] Diagram showing an example of an area where filling ingots are arranged in a segment ring [Figure 9] Diagram showing an example of a filling ingot attached to a steel segment

Modes for Carrying Out the Invention

[0013] Embodiments of the present invention will be described below with reference to the drawings.

[0014] Figure 1 shows a schematic configuration of a shield tunnel according to an embodiment of the present invention. Fig. 2(A) is a sectional view taken along line A-A of Fig. 1. Fig. 2(B) is a sectional view taken along line B-B of Fig. 1. Note that, regarding the suspended load (lower member 201A of the box culvert) of the electric hoist 35a shown in Fig. 1, illustration thereof is omitted in Fig. 2(B). Further, in the present embodiment, for the sake of convenience, the front-back and left-right directions are defined with the tunnel excavation direction as the forward direction.

[0015] The construction apparatus for this shield tunnel includes a shield tunneling machine 1 for excavating a tunnel, a gantry-type follow-up carriage 20 (20A to 20D) that moves in accordance with the excavation of the shield tunneling machine 1, and a crane 30 supported by the follow-up carriage 20.

[0016] The shield tunneling machine 1 includes a cylindrical (for example, circular cylindrical) skin plate 2 that forms the outer shell of its main body. The shield tunneling machine 1 excavates the ground with a cutter head 3 provided on the front surface of the skin plate 2, takes in earth and sand, and discharges it rearward to advance.

[0017] Inside the skin plate 2 of the shield tunneling machine 1, a plurality of propulsion jacks 4 are arranged at intervals in the circumferential direction along the inner surface of the skin plate 2. The propulsion jack 4 is a hydraulic jack composed of a cylinder 4a and a rod 4b. One end of the cylinder 4a is fixed to the skin plate 2, and the rod 4b can advance and retract on the other end side. By extending the propulsion jack 4 with the tip of the rod 4b of the propulsion jack 4 abutted against an existing segment (segment piece) SP, the shield tunneling machine 1 can obtain propulsion force. In this way, the propulsion jack 4 takes a reaction force from the existing segment SP and propels the shield tunneling machine 1.

[0018] The shield tunneling machine 1 is provided with an erector device 5 inside the rear part (tail part) of the skin plate 2. While gripping the segment SP with the gripping part 5a of the erector device 5, the erector device 5 can appropriately move the segment SP mainly in the circumferential direction of the tunnel, in the front-rear direction of the tunnel (tunnel axis direction), and in the inside-outside direction of the tunnel (for example, tunnel diameter direction). The erector device 5 assembles the segment SP in the circumferential direction inside the rear part (tail part) of the skin plate 2 to construct a cylindrical (for example, cylindrical) segment ring SR. Here, the cylindrical (for example, cylindrical) lining body 100 is constructed by connecting adjacent segment rings SR in the front-rear direction of the tunnel.

[0019] The segment SP can be, for example, (1) a steel segment, (2) a steel segment with concrete cast inside, (3) a composite segment in which five surfaces except the inner surface of the segment are constituted by a steel shell and concrete is cast therein, or (4) an RC segment (a concrete segment). A gripping hole (not shown) for the gripping part 5a of the erector device 5 is formed in each of the segments SP.

[0020] The shield tunneling machine 1 has a segment supply device 6 that supplies the segment SP to the erector device 5 and a weight bogie 7 that is arranged so as to surround the left, right, and upper sides of the segment supply device 6.

[0021] The segment supply device 6 includes a segment transport bogie 6a that moves on the bottom of the lining body 100 and a transfer mechanism (not shown) that advances the segment SP from the rearmost segment loading position to the foremost segment supply position on this transport bogie 6a.

[0022] The weight bogie 7 is made of steel, for example, and is configured to move the bottom of the lining body 100 in accordance with the movement (forward movement) of the segment supply device 6. Here, the weight bogie 7 is arranged behind the erector device 5. That is, the weight bogie 7 is located behind the construction position of the segment ring SR by the erector device 5.

[0023] In this embodiment, the trailing bogie 20 is connected to the rear of the shield tunneling machine 1 by a connecting beam (not shown). However, the trailing bogie 20 may not be connected to the shield tunneling machine 1. In any case, the trailing bogie 20 is a gantry pedestal that moves as the shield tunneling machine 1 advances.

[0024] In this embodiment, the trailing bogie 20 is composed of first to fourth bogies 20A to 20D that are connected to each other. The first bogie 20A is connected to the shield tunneling machine 1 by a connecting beam (not shown), and the bogies 20A to 20D are also connected to each other. Further, each of the bogies 20A to 20D is provided with traveling wheels on the gantry legs and can move smoothly on the rails laid in the lining body 100, in this embodiment, on the rails laid in the lining body 100. Note that the number of bogies constituting the trailing bogie 20 is not limited to four and can be any number of one or more.

[0025] The trailing bogie 20 is provided with a crane (a hoist-type ceiling crane in this embodiment) 30. The crane 30 includes two traveling rails 31 provided across the fourth bogie 20D, the third bogie 20C, the second bogie 20B, the first bogie 20A, and the rear part of the shield tunneling machine 1, a pair of front and rear traversing rails 34a and 34b that can move individually in the tunnel front-rear direction along the traveling rails 31, a lifting electric hoist 35a that can move in the tunnel width direction along the front traversing rail 34a, and a lifting electric hoist (not shown) that can move in the tunnel width direction along the rear traversing rail 34b. Note that in this embodiment, an example in which the electric hoists 35a and 35b share the traveling rails 31 is shown. However, alternatively, a traveling rail for the electric hoist 35a and a traveling rail for the electric hoist 35b may be provided separately. Further, the number of electric hoists constituting the crane 30 is not limited to two and may be one, or three or more.

[0026] In this embodiment, for the conveyance of the segment SP, the lower member 201A of the box culvert, and the side ingots 250L and 250R described later, etc., a construction equipment carrier 40 that travels on the installed lower member 201A of the box culvert is used. Incidentally, the construction equipment carrier 40 may be used for the conveyance of the upper member 201B of the box culvert 201. Here, the construction equipment carrier 40 is a vehicle that conveys construction equipment to the shield tunneling machine 1. The construction equipment carrier 40 can travel within the installed box culvert 201. The construction equipment carrier 40 can load construction equipment and travel from the shaft side to the face side within the lining structure 100.

[0027] Here, regarding the construction method of the floor slab 120, in addition to the aforementioned FIGS. 1 and 2, FIGS. 3 and 4 will be used for explanation. FIGS. 3 and 4 show the construction method of the floor slab 120.

[0028] The floor slab 120 forms a floor surface within the lining structure 100. In this embodiment, as shown in FIG. 4(c), it is composed of the box culvert 201, the concrete blocks 202L and 202R, and the embankment structures 203L and 203R.

[0029] The box culvert 201 is made of precast concrete and is arranged at the central portion in the width direction of the bottom of the tunnel (the bottom of the lining structure 100). The box culvert 201 is divided by a dividing surface S1 into a box culvert lower member 201A having a U-shaped cross-section with an upper surface opening arranged at the bottom of the tunnel, and a box culvert upper member 201B having a U-shaped cross-section with a lower surface opening arranged on the box culvert lower member 201A. Here, the box culvert 201 is cited as an example of the "concrete floor slab member" of the present invention.

[0030] The concrete block 202L is made of precast concrete and is arranged adjacent to the left side of the box culvert 201, and is installed flush with the upper surface of the box culvert 201 (the upper member 201B of the box culvert). Also, the concrete block 202L is divided into two blocks stacked in the vertical direction, that is, a lower block member 202LA and an upper block member 202LB. Here, the dividing surface S2 between the lower block member 202LA and the upper block member 202LB extends in the horizontal direction.

[0031] The concrete block 202R is made of precast concrete and is arranged adjacent to the right side of the box culvert 201, and is installed flush with the upper surface of the box culvert 201 (the upper member 201B of the box culvert). Also, the concrete block 202R is divided into two blocks stacked in the vertical direction, that is, a lower block member 202RA and an upper block member 202RB. Here, the dividing surface S3 between the lower block member 202RA and the upper block member 202RB extends in the horizontal direction.

[0032] In this embodiment, the dividing surfaces S2 and S3 have different heights with respect to the dividing surface S1. Specifically, the dividing surfaces S2 and S3 are set at a higher position than the dividing surface S1.

[0033] The lower member 201A of the box culvert, the upper member 201B of the box culvert, the lower block members 202LA and 202RA, and the upper block members 202LB and 202RB all have dimensions in the tunnel longitudinal direction that match the dimensions in the tunnel longitudinal direction of the segment SP.

[0034] In this embodiment, an embankment structure 203L is constructed between the concrete block 202L and the left sidewall of the tunnel (the left sidewall of the lining structure 100). The embankment structure 203L is constructed by filling the space between the concrete block 202L and the left sidewall of the tunnel with the fluidized treated soil after the installation of the concrete block 202L and then solidifying it. Here, as the fluidized treated soil, for example, a material obtained by adding cement, water, a fluidizing agent, etc. to the tunnel excavation soil generated in large quantities on-site and stirring and mixing them can be used.

[0035] Similarly, an embankment structure 203R is constructed between the concrete block 202R and the right sidewall of the tunnel (the right sidewall of the lining structure 100). The embankment structure 203R is constructed by filling the space between the concrete block 202R and the right sidewall of the tunnel with the aforementioned fluidized treated soil after the installation of the concrete block 202R and then solidifying it.

[0036] In the method for constructing the floor slab 120 in the present embodiment, first, as shown in Fig. 3(A), within the skin plate 2 of the shield tunneling machine 1, side ingots 250L and 250R are installed on the segment ring SR using the erector device 5. In the present embodiment, the side ingots 250L and 250R are installed on the segment ring SR at a position in front of the segment supply device 6 and the weight bogie 7. The side ingots 250L and 250R are made of metal (for example, steel), or are made of a composite structure of a metal shell (for example, a steel shell) and an inorganic material (for example, concrete or mortar, etc.) filled in the metal shell (in other words, made of a composite structure of metal and an inorganic material). Regarding the "made of a composite structure" here, for example, "made of reinforced concrete" and / or "made of precast concrete" used in the configuration of tunnel floor members, etc. may be excluded. Also, regarding the "inorganic material" here, an inorganic material that is a solid whose basic component or main component is composed of a non-metallic substance and mainly exhibits hydraulicity, air-hardening property, sinterability, and fusion-cooling hardening property may be used. Here, the side ingots 250L and 250R are cited as an example of the "first hammer member" of the present invention. Regarding this "first hammer member" and the "second hammer member" described later, the weight per unit volume (specific gravity) is larger than that of the segment SP. For example, it is preferable that at least one of the "first hammer member" and the "second hammer member" has a specific gravity of 1.2 times or more that of the segment SP.

[0037] The side ingots 250L and 250R are installed in a portion avoiding the central portion in the width direction at the bottom of the tunnel so as not to interfere with the facilities of the shield tunneling machine 1 such as the segment supply device 6 and the weight bogie 7. More specifically, the side ingots 250L and 250R are arranged in a portion avoiding the lowermost part of the lower half of the tunnel. Also, within the segment ring SR, the side ingots 250L and 250R are installed on the side of the region through which the segment supply device 6 (and the weight bogie 7) passes (see Fig. 2(A)).

[0038] For each of the side ingots 250L and 250R, in order not to interfere with the equipment of the shield tunneling machine 1, they have a shape with different thicknesses (lengths in the tunnel inner - outer direction) in the tunnel circumferential direction. In this embodiment, the thickness of the lower part (the central part side in the width direction of the tunnel bottom) of each of the side ingots 250L and 250R is smaller than the thickness of the upper part (that is, the lower part is thinner than the upper part). The side ingots 250L and 250R are each formed such that the dimension in the tunnel front - rear direction is either the same as the dimension in the tunnel front - rear direction of the segment SP or smaller than the dimension in the tunnel front - rear direction of the segment SP. The side ingots 250L and 250R are, for example, rectangular when viewed in the tunnel inner - outer direction.

[0039] In each of the side ingots 250L and 250R, similar to each of the segments SP, a gripping hole (not shown) for the gripping part 5a of the erector device 5 is formed.

[0040] As a method for aligning the side ingots 250L and 250R with the segment ring SR, for example, a convex part made of metal or concrete is installed in advance at a predetermined position on the inner surface side of the segment SP, and a concave part corresponding to this convex part is formed in advance in the side ingots 250L and 250R, and a method of fitting the aforementioned convex part into this concave part can be cited. However, the method for aligning the side ingots 250L and 250R with the segment ring SR is not limited to this. Further, the aforementioned convex part is preferably detachably attached to a predetermined position on the inner surface side of the segment SP. Furthermore, the aforementioned convex part may be installed on the segment SP prior to the assembly of the segment SP by the erector device 5, or may be installed on the segment SP constituting the segment ring SR after assembling the segment SP with the erector device 5 to construct the segment ring SR.

[0041] As a method for fixing the side ingots 250L and 250R to the segment ring SR, for example, an insert having a female screw portion is previously installed on the inner surface side of the segment SP, and through holes for inserting bolts are previously formed in the side ingots 250L and 250R. A method of inserting a bolt through this through hole and screwing this bolt into the aforementioned insert can be cited. However, the method for fixing the side ingots 250L and 250R to the segment ring SR is not limited to this.

[0042] Next, as shown in Fig. 3(a), between the shield tunneling machine 1 and the trailing bogie 20, or at the trailing bogie 20, the center ingot 260 is installed on the segment ring SR. In this embodiment, at the first bogie 20A, using the electric hoist 35a of the crane 30, the center ingot 260 is installed on the segment ring SR. The center ingot 260 is installed on the segment ring SR at a position behind the segment supply device 6 and the weight bogie 7. The center ingot 260 is made of metal (for example, steel), or has a composite structure made of a metal shell (for example, a steel shell) and an inorganic material (for example, concrete or mortar, etc.) filled in the metal shell (in other words, a composite structure made of metal and an inorganic material), similar to the aforementioned side ingots 250L and 250R. Here, the center ingot 260 is cited as an example of the "second weight member" of the present invention. The composition of the "second weight member" is the same as the composition of the "first weight member".

[0043] The center ingot 260 is installed at the center in the width direction of the tunnel bottom. More specifically, the center ingot 260 is arranged at the lowermost part of the lower half of the tunnel. The center ingot 260 is, for example, rectangular when viewed in the tunnel inside-outside direction, and the dimension in the tunnel front-rear direction is the same as the dimension in the tunnel front-rear direction of the segment SP, or is formed smaller than the dimension in the tunnel front-rear direction of the segment SP.

[0044] The method of aligning the center ingot 260 with the segment ring SR is the same as the method of aligning the side ingots 250L and 250R with the segment ring SR described above, so the description thereof is omitted. Also, the method of fixing the center ingot 260 to the segment ring SR is the same as the method of fixing the side ingots 250L and 250R to the segment ring SR described above, so the description thereof is omitted.

[0045] Next, as shown in Fig. 3(c), between the shield tunneling machine 1 and the trailing bogie 20, or on the trailing bogie 20, the box culvert lower member 201A is installed on the center ingot 260 at the center in the width direction of the tunnel bottom (more specifically, the lowermost part of the lower half of the tunnel). In the present embodiment, on the first bogie 20A, using the electric hoist 35a of the crane 30, the box culvert lower member 201A is installed on the center ingot 260 at the center in the width direction of the bottom of the segment ring SR. The box culvert lower member 201A is installed at a position behind the segment supply device 6 and the weight bogie 7 and at the center in the width direction of the bottom of the segment ring SR.

[0046] Next, as shown in Fig. 4(a), between the shield tunneling machine 1 and the trailing bogie 20, or on the trailing bogie 20, the box culvert upper member 201B is installed on the box culvert lower member 201A at the center in the width direction of the tunnel bottom (more specifically, the lowermost part of the lower half of the tunnel). In the present embodiment, on the third bogie 20C, using the electric hoist 35b of the crane 30, the box culvert upper member 201B is installed on the box culvert lower member 201A at the center in the width direction of the bottom of the segment ring SR. The box culvert upper member 201B is installed at a position behind the segment supply device 6 and the weight bogie 7 and at a position behind the installation position of the box culvert lower member 201A and at the center in the width direction of the bottom of the segment ring SR.

[0047] Next, as shown in Fig. 4(a), behind the trailing bogie 20, concrete blocks 202L and 202R are installed on the lateral sides in the width direction of the box culvert 201. In this embodiment, behind the fourth bogie 20D, the concrete blocks 202L and 202R are installed adjacent to both the left and right sides of the box culvert 201.

[0048] Next, as shown in Fig. 4(c), embankment structures 203L and 203R are constructed between the concrete blocks 202L and 202R and the tunnel side wall portions. In this way, the floor slab 120 is constructed.

[0049] Next, the counterweight measures against the uplift of the shield tunnel in this embodiment will be described with reference to Fig. 1.

[0050] In the construction section α1, as counterweight measures against uplift, the shield tunneling machine 1, the segment ring SR, and the side ingots 250L and 250R can act.

[0051] In the construction section α2, as counterweight measures against uplift, the segment ring SR, the side ingots 250L and 250R, the weight bogie 7, and the segment supply device 6 can act.

[0052] In the construction section α3, as counterweight measures against uplift, the segment ring SR, the side ingots 250L and 250R, the trailing bogie 20, the center ingot 260, and the box culvert lower member 201A can act.

[0053] In the construction section α4, as counterweight measures against uplift, the segment ring SR, the side ingots 250L and 250R, the trailing bogie 20, the center ingot 260, the box culvert lower member 201A, and the box culvert upper member 201B can act.

[0054] Behind the construction section α4, as countermeasures against floating, the segment ring SR, side ingots 250L, 250R, center ingot 260, box culvert 201, concrete blocks 202L, 202R, and embankment structures 203L, 203R can act.

[0055] Figures 5 and 6 show the first to fifth modified examples of the floor slab 120. The differences from the illustration of Fig. 4(c) described above will be explained.

[0056] In the first modified example shown in Fig. 5(a), the center ingot 260 is omitted. In the second modified example shown in Fig. 5(b), the side ingots 250L, 250R are omitted.

[0057] In the third modified example shown in Fig. 5(c), the concrete blocks 202L, 202R are replaced by the embankment structures 203L, 203R.

[0058] In the fourth modified example shown in Fig. 6(a), the center ingot 260 is omitted, and further, the concrete blocks 202L, 202R are replaced by the embankment structures 203L, 203R.

[0059] In the fifth modified example shown in Fig. 6(b), the side ingots 250L, 250R are omitted, and further, the concrete blocks 202L, 202R are replaced by the embankment structures 203L, 203R.

[0060] Figure 7 is a diagram showing an example of countermeasures against floating of a shield tunnel. Specifically, Fig. 7(a) is a diagram showing an example of a shield tunnel that extends obliquely downward from a vertical shaft, and Figs. 7(b) to (e) are cross-sectional views of sections α11 to α14 of this shield tunnel.

[0061] The vertical shaft 300 shown in Fig. 7(A) is a launching or arrival vertical shaft for the shield tunneling machine 1 constructed in the natural ground. The shield tunnel 110 is constructed by the aforementioned shield tunnel construction device including the shield tunneling machine 1, and extends obliquely downward from the vertical shaft 300. Regarding the shield tunnel 110, the overburden decreases as it approaches the ground surface GL. As the overburden decreases, the shield tunnel 110 is more likely to float. Therefore, in the example shown in Fig. 7, among the shield tunnel 110, the area with less overburden (that is, the area closer to the ground surface GL) has a greater anti - floating counterweight.

[0062] Regarding the shield tunnel 110 shown in Fig. 7(A), in the direction away from the vertical shaft 300, in order, it is arranged side by side with sections α11, α12, α13, α14. That is, the overburden gradually decreases from section α14 to section α11.

[0063] As shown in Figs. 7(A) and (B), in section α11, as the anti - floating counterweight, the segment ring SR, side ingots 250L, 250R, center ingot 260, box culvert 201, concrete blocks 202L, 202R, and embankment structures 203L, 203R can act.

[0064] As shown in Figs. 7(A) and (C), in section α12, as the anti - floating counterweight, the segment ring SR, side ingots 250L, 250R, box culvert 201, concrete blocks 202L, 202R, and embankment structures 203L, 203R can act.

[0065] Here, as shown in Figs. 7(B) and (C), the sizes of the concrete blocks 202L, 202R are different between section α11 and section α12. Specifically, the concrete blocks 202L, 202R in section α11 are larger than the concrete blocks 202L, 202R in section α12. Thus, the sizes of the concrete blocks 202L, 202R can be appropriately set according to the required anti - floating counterweight.

[0066] As shown in FIGS. 7(A) and 7(E), in section α13, as anti - floating weights, the segment ring SR, side ingots 250L, 250R, box culvert 201, and embankment structures 203L, 203R can act.

[0067] As shown in FIGS. 7(A) and 7(O), in section α14, as anti - floating weights, the segment ring SR, box culvert 201, and embankment structures 203L, 203R can act.

[0068] FIG. 8 is a diagram showing an example of the region β where the filling ingot 400 is arranged in the segment ring SR. FIG. 9 is a diagram showing an example of the filling ingot 400 attached to the segment SP when the segment SP is a steel segment. FIG. 9(A) is a plan view thereof, and FIG. 9(I) is a C - C cross - sectional view of FIG. 9(A).

[0069] As shown in FIGS. 9(A) and 9(I), the segment SP which is a steel segment includes a curved rectangular - shaped steel frame body 401, a skin plate 402 arranged to close the ground side of the frame body 401, and a plurality of vertical ribs 403. And the filling ingot 400 can be installed in part or all of the space surrounded by the frame body 401 and the skin plate 402. The filling ingot 400 is made of metal (for example, steel) like the aforementioned side ingots 250L, 250R and the center ingot 260, or is of a composite structure made of a metal shell (for example, a steel shell) and an inorganic material (for example, concrete or mortar etc.) filled in the metal shell (in other words, a composite structure made of metal and an inorganic material).

[0070] The filling ingot 400 can be used together with the aforementioned side ingots 250L, 250R, or instead of the side ingots 250L, 250R. Also, the filling ingot 400 can be used together with the aforementioned center ingot 260, or instead of the center ingot 260.

[0071] When the backfill ingot 400 functions as the "first hammer member" of the present invention, in the skin plate 2 of the shield tunneling machine 1, for example, using the electra device 5, the backfill ingot 400 can be installed in the segment ring SR made of steel segments. When installing the backfill ingot 400 using the electra device 5, gripping holes (not shown) for the gripping part 5a of the electra device 5 are formed in advance in each of the backfill ingots 400. [[ID=!]]

[0072] When the backfill ingot 400 functions as the "second hammer member" of the present invention, for example, using the electric hoist 35a of the crane 30, the backfill ingot 400 can be installed in the segment ring SR made of steel segments.

[0073] In addition, regarding the backfill ingot 400, the backfill ingot 400 may be installed in the steel segment prior to assembling the segment SP made of steel segments with the electra device 5.

[0074] As shown in FIG. 8, regarding the region β where the backfill ingot 400 is arranged in the segment ring SR, it may include the central portion in the width direction at the bottom of the tunnel and / or a portion avoiding the central portion in the width direction at the bottom of the tunnel. Further, this region β may be included in the lower half which is the lower half of the tunnel.

[0075] According to the present embodiment, the method for constructing a shield tunnel includes constructing a segment ring SR by assembling a plurality of segments SP in the cylindrical skin plate 2 of the shield tunneling machine 1, and installing a first hammer member (for example, side ingots 250L, 250R, backfill ingot 400) made of metal or a composite structure of metal and inorganic materials in the segment ring SR within the skin plate 2. Therefore, after constructing the segment ring SR within the skin plate 2, immediately, the first hammer member can be installed in the segment ring SR. Therefore, after the construction of the segment ring SR, countermeasures against the uplift of the shield tunnel can be promptly taken.

[0076] According to this embodiment, the segment ring SR is constructed using the erector device 5 of the shield tunneling machine 1, and the first weight member (for example, side ingots 250L, 250R, and inner filling ingot 400) is installed on the segment ring SR using the erector device 5. Thereby, the construction work of the segment ring SR and the installation work of the first weight member can be carried out as a series of operations using the erector device 5.

[0077] According to this embodiment, the first weight member (for example, side ingots 250L, 250R, and inner filling ingot 400) is installed at a position avoiding the center portion in the width direction at the bottom of the tunnel. Therefore, interference between the equipment of the shield tunneling machine 1 and the first weight member installed at the bottom of the tunnel can be prevented.

[0078] According to this embodiment, the method for constructing a shield tunnel further includes installing a concrete floor slab member (for example, box culvert 201) at the center portion in the width direction of the bottom of the tunnel. The side ingots 250L and 250R can be installed at positions avoiding this concrete floor slab member.

[0079] According to this embodiment, the method for constructing a shield tunnel further includes installing a second weight member (for example, center ingot 260, inner filling ingot 400) made of metal or a composite structure of metal and an inorganic material on the segment ring SR between the shield tunneling machine 1 and the following carriage 20 that moves in accordance with the excavation in the tunnel axis direction of the shield tunneling machine 1, or on the following carriage 20. The second weight member is installed at the center portion in the width direction of the bottom of the tunnel. And a concrete floor slab member (for example, box culvert 201) can be installed on the second weight member at the center portion in the width direction of the bottom of the tunnel.

[0080] Also, according to the present embodiment, the method for constructing a shield tunnel further includes installing concrete blocks 202L and 202R on the lateral sides in the width direction of a concrete floor slab member (e.g., box culvert 201) extending in the tunnel axis direction. These concrete blocks 202L and 202R can act as counterweights against the uplift of the shield tunnel.

[0081] Also, according to the present embodiment, the internal structure of the shield tunnel includes first weight members (e.g., side ingots 250L and 250R, and internal filling ingots 400) made of metal or a composite structure of metal and inorganic materials, which are installed at a portion avoiding the central part in the width direction at the bottom of the tunnel. Therefore, interference between the equipment of the shield tunneling machine 1 and the first weight members installed at the bottom of the tunnel can be prevented.

[0082] Also, according to the present embodiment, the internal structure of the shield tunnel further includes a concrete floor slab member (e.g., box culvert 201) installed at the central part in the width direction at the bottom of the tunnel. The side ingots 250L and 250R can be installed at positions avoiding this concrete floor slab member.

[0083] Also, according to the present embodiment, the internal structure of the shield tunnel further includes second weight members (e.g., center ingot 260, and internal filling ingots 400) made of metal or a composite structure of metal and inorganic materials, which are installed at the central part in the width direction at the bottom of the tunnel. And a concrete floor slab member (e.g., box culvert 201) can be installed on the second weight members at the central part in the width direction at the bottom of the tunnel.

[0084] Further, according to the present embodiment, the internal structure of the shield tunnel further includes concrete blocks 202L and 202R installed on the lateral sides in the width direction of a concrete floor slab member (for example, box culvert 201) extending in the tunnel axis direction. In other words, the internal structure of the shield tunnel further includes a pair of concrete blocks 202L and 202R installed so as to sandwich a concrete floor slab member (for example, box culvert 201) on both sides in the width direction at the bottom of the tunnel. These concrete blocks 202L and 202R can act as counterweights against the uplift of the shield tunnel.

[0085] In addition, in the construction section α2 shown in FIG. 1, when the weight truck 7 can be omitted as a counterweight against uplift, the weight truck 7 may not be arranged. That is, the aforementioned weight truck 7 may be omitted.

[0086] In the present embodiment, at least one of the side ingots 250L and 250R and the center ingot 260 preferably has a suspension fitting so that it can be lifted by a crane or the like during its loading and transportation. This suspension fitting may be used when installing the center ingot 260 on the segment ring SR.

[0087] As described above, the side ingot 250L has a shape with different thicknesses (lengths in the tunnel inner-outer direction) in the tunnel circumferential direction so as not to interfere with the equipment of the shield tunneling machine 1. For this reason, a step is formed in the side ingot 250L due to the difference in the thickness. On the other hand, the gripping part 5a of the erector device 5 has an engaging part that can engage with the gripping hole of the segment SP and a plurality of abutting parts that are arranged around this engaging part and can abut against the inner surface of the segment SP. When these abutting parts abut against the inner surface of the segment SP, wobbling or the like of the gripping part 5a of the segment SP during the assembly of the segment SP by the erector device 5 is suppressed. In this regard, when installing the side ingot 250L on the segment ring SR using the erector device 5, by providing a thickness adjusting member such as a sleeper to eliminate the aforementioned step of the side ingot 250L and making the abutting part of the gripping part 5a abut against it, wobbling or the like of the side ingot 250L against the gripping part 5a during the installation of the side ingot 250L by the erector device 5 can be suppressed. This also applies to the side ingot 250R.

[0088] In the present embodiment, the side ingots 250L and 250R are installed on both the left and right sides of the tunnel bottom, but the side ingot may be installed on only one of the left and right sides of the tunnel bottom.

[0089] In the present embodiment, an example in which the cross-sectional shapes of the skin plate 2 and the segment ring SR are circular is shown, but the cross-sectional shapes of the skin plate 2 and the segment ring SR are not limited to circular. The cross-sectional shapes of the skin plate 2 and the segment ring SR may be, for example, elliptical or rectangular.

[0090] The illustrated embodiment is merely an example of the present invention, and it goes without saying that the present invention includes various improvements and modifications made by those skilled in the art within the scope of the claims in addition to those directly shown by the described embodiment. Incidentally, the claims at the time of filing were as follows. [Claim 1] constructing a segment ring by assembling a plurality of segments within the cylindrical skin plate of the shield tunneling machine, and Installing a first weight member made of metal or a composite structure of metal and an inorganic material in the segment ring within the skin plate; A method for constructing a shield tunnel, including this. [Claim 2] Constructing the segment ring using the erector device of the shield tunneling machine, Installing the first weight member in the segment ring using the erector device, The method for constructing a shield tunnel according to Claim 1. [Claim 3] The method for constructing a shield tunnel according to Claim 1 or Claim 2, wherein the first weight member is installed at a portion avoiding the central part in the width direction at the bottom of the tunnel. [Claim 4] The method for constructing a shield tunnel according to any one of Claims 1 to 3, further including installing a concrete floor slab member at the central part in the width direction at the bottom of the tunnel. [Claim 5] The method for constructing a shield tunnel according to any one of Claims 1 to 4, further including installing a second weight member made of metal or a composite structure of metal and an inorganic material in the segment ring between the shield tunneling machine and a following carriage that moves in accordance with the tunneling in the tunnel axis direction of the shield tunneling machine, or in the following carriage. [Claim 6] The method for constructing a shield tunnel according to Claim 5, wherein the second weight member is installed at the central part in the width direction at the bottom of the tunnel. [Claim 7] An internal structure of a shield tunnel, An internal structure of a shield tunnel, comprising a first weight member made of metal or a composite structure of metal and an inorganic material installed at a portion avoiding the central part in the width direction at the bottom of the tunnel. [Claim 8] The internal structure of a shield tunnel according to Claim 7, further comprising a second weight member made of metal or a composite structure of metal and an inorganic material installed at the central part in the width direction at the bottom of the tunnel. [Claim 9] The internal structure of a shield tunnel according to Claim 7 or Claim 8, further comprising a concrete floor slab member installed at the central part in the width direction at the bottom of the tunnel.

Explanation of Symbols

[0091] 1…Shield tunneling machine, 2…Skin plate, 3…Cutting head, 4…Propulsion jack, 4a…Cylinder, 4b…Rod, 5…Erector device, 5a…Gripping part, 6…Segment supply device, 6a…Segment carrier vehicle, 7…Weight vehicle, 20…Following vehicle, 20A…First vehicle, 20B…Second vehicle, 20C…Third vehicle, 20D…Fourth vehicle, 30…Crane, 31…Running rail, 34a, 34b…Transverse rail, 35a, 35b…Electric hoist, 40…Construction material transport vehicle, 100…Lining structure, 110…Shield tunnel, 120…Floor slab, 201…Box culvert, 201A…Lower member of box culvert, 201B…Upper member of box culvert, 202L, 202R…Concrete block, 202LA, 202RA…Lower block member, 202LB, 202RB…Upper block member, 203L, 203R…Embankment structure, 250L, 250R…Side ingot, 260…Center ingot, 300…Shaft, 400…Backfill ingot, 401…Frame body, 402…Skin plate, 403…Vertical rib, GL…Ground surface, S1~S3…Division surface, SP…Segment, SR…Segment ring, α1~α4…Construction section, α11~α14…Section, β…Region

Claims

1. Constructing a segment ring by assembling a plurality of segments using the erector device of the shield tunneling machine within the cylindrical skin plate of the shield tunneling machine, and constructing a cylindrical lining body by connecting adjacent segment rings in the tunnel axis direction, and Installing a first weight member made of metal or a composite structure of metal and an inorganic material on the segment ring using the erector device within the skin plate, including The shield tunneling machine presses the segment ring on which the first weight member is installed backward with the propulsion jack of the shield tunneling machine, and advances while excavating the ground with the thrust generated as the reaction force, The first weight member does not constitute the lining body, a method for constructing a shield tunnel.

2. The first weight member is installed at a portion avoiding the central portion in the width direction at the tunnel bottom, the method for constructing a shield tunnel according to Claim 1.

3. The first weight member includes a first portion that is a portion closer to the central portion in the width direction of the tunnel bottom and a second portion that is a portion farther from the central portion in the width direction of the tunnel bottom than the first portion, and the thickness of the first portion is smaller than the thickness of the second portion, the method for constructing a shield tunnel according to Claim 2.

4. Constructing a segment ring by assembling a plurality of segments using the erector device of the shield tunneling machine within the cylindrical skin plate of the shield tunneling machine, and Installing a first weight member made of metal or a composite structure of metal and an inorganic material on the segment ring using the erector device within the skin plate, including The first weight member is installed at a portion avoiding the central portion in the width direction at the tunnel bottom, The shield tunneling machine presses the segment ring on which the first weight member is installed backward with the propulsion jack of the shield tunneling machine, and advances while excavating the ground with the thrust generated as the reaction force, The first weight member includes a first portion that is a portion closer to the central portion in the width direction of the tunnel bottom and a second portion that is a portion farther from the central portion in the width direction of the tunnel bottom than the first portion, and the thickness of the first portion is smaller than the thickness of the second portion, a method for constructing a shield tunnel.

5. The method for constructing a shield tunnel according to any one of claims 1 to 4, further including installing a concrete floor slab member at the center in the width direction of the tunnel bottom.

6. The method for constructing a shield tunnel according to any one of claims 1 to 5, further including installing a second weight member made of metal or a composite structure of metal and an inorganic material on the segment ring between the shield tunneling machine and a trailing bogie that moves in accordance with the tunneling of the shield tunneling machine in the tunnel axis direction, or on the trailing bogie.

7. The method for constructing a shield tunnel according to claim 6, wherein the second weight member is installed at the center in the width direction of the tunnel bottom.

8. Constructing a segment ring by assembling a plurality of segments within a cylindrical skin plate of a shield tunneling machine, and Installing a first weight member made of metal or a composite structure of metal and an inorganic material on the segment ring within the skin plate, A method for constructing a shield tunnel, including: Installing a second weight member made of metal or a composite structure of metal and an inorganic material on the segment ring between the shield tunneling machine and a trailing bogie that moves in accordance with the tunneling of the shield tunneling machine in the tunnel axis direction, or on the trailing bogie, and Installing a concrete floor slab member at the center in the width direction of the tunnel bottom, Further including: The method for constructing a shield tunnel, wherein the second weight member is installed at the center in the width direction of the tunnel bottom.

9. The method for constructing a shield tunnel according to claim 8, wherein the floor slab member is installed on the second weight member.

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