JP2014201909A - Segment assembly method of shield tunnel and tunnel boring machine used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a connection place of a small cross-sectional shield tunnel for constructing its outer shell part, when constructing the outer shell part of a large cross-sectional tunnel.SOLUTION: A tunnel boring machine 1 on the present invention is constituted so that a segment 11 can be respectively assembled in U-shaped segment assemblies 12 and 12 on its both sides so as a reinforcing intermediate wall 6 in a front space 5 close to a cutter head 2 among a segment assembly space 4, and the segment assemblies can be mutually connected by fitting a connection segment 21 in a separation space 31 for expanding between the opening ends of the mutually different segment assemblies 12 and 12 in a rear space when the segment assemblies 12 and 12 relatively move to a rear space 7 from the front space 5.

Description

  The present invention relates to a shield tunnel segment assembling method applied when a large section tunnel is constructed by interconnecting small section shield tunnels and a tunnel excavator used therefor.

  There are many tunnel constructions using shield machines in Japan and overseas, and the technologies are becoming more diverse, and the demand for underground space is increasing. The size of the cross section that can be constructed with a shield machine is limited by the production cost and production location, and it is not realistic to excavate a large cross section tunnel with a diameter exceeding 20 m with a single shield machine. . In particular, when a large cross section is a short distance, such as a junction of roads, expensive machine manufacturing is irrational from a cost standpoint.

  As a technique for excavating large-section tunnels as described above, the existing shield tunnel is widened or two shield tunnels are integrated by using a straight or curved pipe called a pipe roof as a support. A pipe roof construction method or a construction method called MMST in which a small section shield tunnel is connected to each other to construct an outer shell portion of a large section tunnel and then the inside is excavated.

  All of these methods have a track record as a method capable of constructing a large section tunnel, but in the pipe roof method, when excavating the ground inside the pipe roof, there is a tendency for the ground to deform as the stress is released, If it is going to prevent this, the installation span of a pipe loop must be shortened, and there exists a concern about the fall of construction efficiency.

  In addition, in the MMST method, two adjacent shield tunnels must be interconnected, so it is indispensable to secure water stoppage by improving the ground and to reinforce the segment. In the same way as the pipe roof method, in terms of construction efficiency There was room for improvement.

Japanese Utility Model Publication No. 7-38296 JP-A-8-60988 Japanese Patent Laid-Open No. 9-291787

  Here, in the MMST method, by increasing the dimension along the connecting direction in the shield tunnel having a small cross section, that is, the dimension along the circumferential direction when they are connected to form the outer shell, The total number of shield tunnels to be configured, and hence the number of connection points, is reduced, and accordingly, the construction efficiency can be improved. To that end, the size of the shield machine along the connection direction can be increased.

  However, the shield machine is a hollow cylinder that opens rearward because it continuously advances a new segment while continuously joining new segments at the beginning of an existing segment row and taking a reaction force from the segment row. The rear part is constituted by a cylindrical body.

  For this reason, a shield machine with a rectangular cross section with an excessive aspect ratio has to be disadvantageous in terms of structure in supporting earth pressure from the surrounding ground, and as a result, the shield tunnel connecting the outer shell is connected. The current situation is that the number of places cannot be reduced sufficiently.

  The present invention has been made in consideration of the above-described circumstances, and provides a shield tunnel segment assembling method capable of reducing the number of shield tunnel connecting portions constituting the outer shell portion and a tunnel excavator used therefor. Objective.

In order to achieve the above object, a method for assembling a shield tunnel segment according to the present invention is as described in claim 1, wherein a segment is formed in the rear interior of a cylindrical body provided in a tunnel excavator and provided with a cutter head at a front opening. In the segment assembling method of the shield tunnel in which an assembly space is provided and the segments are assembled in the segment assembly space,
In the segment assembly space, the material axis of the cylindrical body is arranged in parallel with the front space on the side close to the cutter head, and the inner surface of the cylindrical body is an opposed inner peripheral surface. Assembling the segments into a segment assembly having a shape opened to the reinforcing inner wall side on both sides so as to sandwich the reinforcing inner wall arranged so that each end is joined to the position corresponding to the longitudinal side,
In the rear space on the side separated from the cutter head, the connecting segment is fitted into a spacing space that belongs to a different segment assembly among the segment assemblies and extends between open ends facing each other. Each segment assembly is connected to each other to form a segment ring.

  In the shield tunnel segment assembling method according to the present invention, the reinforcing columns are installed so that the end portions are joined to the inner surfaces of the open ends of the segment assemblies in the front space.

  In the shield tunnel segment assembling method according to the present invention, the shape of the segment assembly is maintained by loading a load in the separation direction on the inner surface facing each open end of the segment assembly in the front space, After the step, the load in the separation direction is unloaded in the rear space, and reinforcing columns are installed so that the end portions are joined to the opposing inner surfaces of the segment rings.

  In the shield tunnel segment assembling method according to the present invention, the reinforcing columns are installed so that each end is joined to the opposing inner surface of the connecting segment.

The tunnel machine according to the present invention is a tunnel machine in which a segment assembly space for assembling a segment is provided in a rear interior of a cylindrical body having a cutter head installed in a front opening. In the machine
In the segment assembly space, the material axis of the cylindrical body is arranged in parallel with the front space on the side close to the cutter head, and the inner surface of the cylindrical body is an opposed inner peripheral surface. A segment set having a shape in which the reinforcing inner wall is arranged so that the ends are joined at positions corresponding to the longitudinal side, and the segments are opened on both sides of the reinforcing inner wall so as to sandwich the reinforcing inner wall. Each of the segment assemblies can be connected to each other in a rear space on the side separated from the cutter head.

  Further, the tunnel excavator according to the present invention is configured such that each of the segment assemblies is fitted into a separated space that extends between open ends that belong to different segment assemblies and that face each other. A connecting segment insertion mechanism that fits connecting segments that can be connected to each other into the spacing space is disposed in the rear space, and the connecting segment insertion mechanism is connected to an inner surface facing each open end of the segment assembly. It is attached to a reinforcing column arranged to be joined so as to be movable in the front-rear direction.

  In addition, the tunnel excavator according to the present invention is configured to maintain the shape of the segment assembly by holding the tip of the elastic member against the inner surface facing each open end of the segment assembly. A mechanism is arranged in the segment assembly space so as to be freely transferable from the rear space to the front space.

  In the segment assembly method of the shield tunnel according to the first invention, the material axis of the cylindrical body and the arrangement surface are parallel to the front space near the cutter head in the segment assembly space provided in the tunnel excavator. The reinforcing inner wall is arranged so that the ends are joined to the inner peripheral surface of the cylindrical body and corresponding to the longitudinal side in the cross section thereof, and the segments are assembled in the segment assembly space. First, the segments are assembled into segment assemblies on both sides so as to sandwich the reinforcing inner wall.

  Next, when the segment assembly relatively moves from the front space to the rear space with the advance of the tunnel excavator, since the reinforcing inner wall is not installed in the rear space, of each segment assembly, The open ends belonging to the different segment assemblies shift from the state separated by the reinforcing inner wall to the state facing each other, so that the connecting segments are fitted in the spaced space extending between the open ends. Then, the segment assemblies are connected to each other.

  In this way, the segments are assembled to the segment assemblies on both sides so as to sandwich the reinforcing inner wall in the front space where the reinforcing inner wall is installed, and then the reinforcing inner wall is installed. The segment assemblies are connected to each other in a rear space that is not, so that they are assembled into segment rings in a so-called two-stage assembly.

  Therefore, while reinforcing the cylindrical body having a large aspect ratio in the cross section with the reinforcing inner wall, it is possible to continuously join the new segment as a segment ring at the head of the existing segment row as before.

  On the other hand, the tunnel excavator according to the second invention suitable for carrying out the first invention described above has a material axis and an arrangement surface of the cylindrical fuselage in the front space near the cutter head in the segment assembly space. The reinforcing inner wall is disposed so that the ends are joined to each other at a position corresponding to the longitudinal side in the transverse cross section of the cylindrical body opposite to the inner peripheral surface of the cylindrical body. So that the segments can be assembled into segment assemblies that are open on the side of the reinforcing inner wall so that the segments are sandwiched, and the segment assemblies are mutually connected in the rear space on the side separated from the cutter head. It is configured so that it can be connected.

  If it does in this way, the middle wall for reinforcement installed in front space will support earth pressure from the surrounding natural ground which acts via a cylindrical body, and it will prevent that a bending deformation arises in this cylindrical body. In addition, since the reinforcing inner wall is not installed in the rear space, there is no possibility that the connecting operation of the segment assemblies in the rear space is hindered.

  Therefore, as before, it is possible to reinforce the cylindrical body having a large aspect ratio in the cross section with the reinforcing inner wall while continuously joining a new segment at the head of the existing segment row as a segment ring. It becomes possible.

  Since each invention described above is mainly applied to the construction of a large section tunnel, it is assumed that the invention is implemented not as a shield tunnel alone but as a plurality of shield tunnels connected in a ring shape. Because the demand is high, the tunnel machine to be used is also supposed to be a shield machine that mainly excavates the earth and sand ground, but it can also be applied when constructing a shield tunnel with a large cross-sectional aspect ratio alone, If it is constructed in a mountainous area, it may be applied to a shielded TBM.

  The cylindrical body is typically a rectangular cross section, but is not limited to a rectangular cross section as long as the aspect ratio of the cross section is large. For example, the short side is semicircular And those having a cross section called a multi-circle or a multi-circle in which a plurality of circular cross sections are arranged side by side are included.

  The purpose of the reinforcing inner wall is to prevent bending deformation on the long side due to the large aspect ratio in the cross section of the cylindrical body, and the thickness is so as to support earth pressure from the surrounding natural ground. And the material may be determined as appropriate.

  Here, the reinforcing inner wall is arranged so as to be arranged in the front space and not in the rear space, but on the cutter head side, it exceeds the foremost part of the front space, that is, the front inside of the cylindrical body. It is possible to reinforce the cylindrical body more firmly by extending to the vicinity of the partition wall provided behind the cutter head, for example.

  In addition, the reinforcing middle wall is typically assumed to continuously extend over the entire front space, or over the entire extending range beyond the front space and its frontmost portion. If there is no problem in securing rigidity, a configuration in which the front space or its extended range is discretely arranged, for example, in the form of a row, for example, can be adopted. By adopting a configuration in which the extended range is discretely arranged in a row, avoiding interference with various equipment and piping installed in the front inside of the cylindrical body, or inside the front of the cylindrical body It is possible to ensure sufficient rigidity of the cylindrical body while allowing workers to move along the longitudinal direction of the cross section.

  The segment assembly is an arrangement shape along the inner peripheral surface of the cylindrical body and is open to the reinforcing inner wall side. If the shape of the cross section of the cylindrical body is, for example, a rectangular shape, If the short side is semicircular, it can be C-shaped.

  In the first invention, when assembling the segments into the segment assemblies in the front space, no special measures are required as long as each segment assembly can be held independently and its shape can be maintained. Since the shape is opened on the reinforcing inner wall side, the shape may not be stable depending on the situation after the assembly is completed, and there is a concern that the facing distance between the open ends may be reduced.

  In that case, it is only necessary to appropriately perform a support between the open ends so that the segment assembly is not deformed as described above, but the support is left as it is as a reinforcing column of the segment ring which is the final form. It is possible to select two cases: a case and a case where only a cylindrical body is provided.

  Here, when the supporting work to be performed between the open ends is left as it is as the reinforcing pillar of the segment ring, the end portions are reinforced so that the end portions are joined to the inner surfaces facing the open ends of the segment assembly in the front space. It is enough to install a pillar.

  In such a configuration, since the reinforcing column serves as a support for maintaining the shape of the segment assembly, if both the support for the segment assembly and the reinforcement for the segment ring are required, these operations are performed. Although there is an advantage that is simplified as a whole, there is a concern that the reinforcement work will be excessive because it is necessary to install a reinforcing column as a support in each segment assembly, and in the segment ring, If the reinforcing pillars are arranged in two rows and it is necessary to perform a post-work in the shield tunnel, there is a concern that workability may be lowered.

  On the other hand, when the support work to be performed between the open ends is a temporary structure only for the cylindrical body, first, in the front space, a load in the separating direction is loaded on the opposing inner surface of each open end in the segment assembly. Adopting a configuration that maintains the shape of the segment assembly, unloads the load in the separation direction in the rear space after the connecting step, and installs a reinforcing column so that the ends are joined to the opposing inner surfaces of the segment ring. be able to.

  In such a configuration, the reinforcing columns need only be arranged in a row, and if the reinforcing columns are arranged in a row in the segment ring, it is necessary to perform a post-work in a shield tunnel. When building a section and when it is necessary to open the segment ring, the workability in the shield tunnel is improved.

  In the latter case, where the reinforcing column is installed after connecting the segment assemblies, the position of the reinforcing column in the segment ring is arbitrary, but the opposing inner surfaces of the connecting segments fitted between the segment assemblies If the reinforcing pillars are installed so that the ends are joined to each other, the reinforcing pillars can function as fitting reinforcements for the connecting segments.

  In the second invention, in order to prevent the segment assembly from being bent and deformed as described in the first invention, a support work is installed between the open ends thereof, and the support work is used as a reinforcing column for the segment ring which is the final form. If it is left as it is, if it adopts a configuration in which the connecting segment insertion mechanism for fitting the connecting segment in the space between the different segment assemblies is attached to the reinforcing column so as to be movable in the front-rear direction Thus, the connecting segments can be fitted efficiently, and as a result, the operation of connecting the segment assemblies and assembling them into segment rings can be performed in a short time.

  On the other hand, when the support work performed between the open ends is a temporary structure only in the cylindrical body, the tip of the expansion / contraction member is pressed against the inner surface facing each open end of the segment assembly. If a configuration is adopted in which the shape holding mechanism configured to hold the shape of the segment is arranged in the segment assembly space so that it can be transferred from the rear space to the front space, the shape holding work is efficiently performed. Can be done.

It is a figure of the tunnel excavation machine 1 concerning this embodiment, (a) is a longitudinal cross-sectional view, (b) is an arrow view from the AA line direction, (c) is an arrow view from the BB line direction. Figure. Similarly, the fragmentary perspective view seen from the back of the tunnel machine 1 which concerns on this embodiment. The longitudinal cross-sectional view which showed a mode that the segment assembly method of the shield tunnel which concerns on this embodiment is implemented using the tunnel excavation machine 1. FIG. The fragmentary perspective view which showed the segment assembly method of the shield tunnel which concerns on a modification. It is the figure which showed the modification of the segment assembly method of a tunnel excavation machine and a shield tunnel, (a) is a longitudinal cross-sectional view, (b) is the arrow line view seen from CC line direction. The longitudinal cross-sectional view which showed another modification of the segment assembly method of a tunnel excavation machine and a shield tunnel. Similarly, it is the figure which showed another modification of the tunnel assembly machine and the segment assembly method of a shield tunnel, (a) is an arrow view seen from the DD line direction, (b) is seen from the EE line direction. Arrow view.

  Hereinafter, embodiments of a tunnel excavator and a shield tunnel segment assembling method using the tunnel excavator according to the present invention will be described with reference to the accompanying drawings.

  FIG.1 and FIG.2 is the figure which showed the tunnel excavation machine 1 which concerns on this embodiment. As shown in these drawings, the tunnel excavator 1 according to the present embodiment is configured as a shield machine for excavating the earth and sand ground, and, like a conventional rectangular shield, a cutter head 2 at a front opening of a cylindrical body 3. , 2 are arranged side by side, and a segment assembly space 4 for assembling the segment 11 is provided inside the rear of the cylindrical body.

  The cylindrical body 3 may be configured to have a rectangular cross section having a horizontal cross section height of, for example, about 5 m, a width of about 10 m, and an aspect ratio of about 2.

  The segment assembly space 4 is provided with an erector 8 for assembling the segment 11 and placing it at the head of the existing segment row, and a propulsion jack 10 for advancing the tunnel excavator 1 using the reaction force from the segment row. However, in the present embodiment, the side close to the cutter head 2 in the segment assembly space, that is, the erector 8 or the propulsion jack is used as the frontmost part and the tail edge 13 of the cylindrical body 3 as the rearmost part. The reinforcing middle wall 6 is disposed in the front space 5 with the position near the position where the 10 is installed being generally the foremost part and the distance d from the tail edge 13 of the cylindrical body 3 being the rearmost part. In this embodiment, the segments 11 can be assembled to the U-shaped segment assemblies 12 and 12 in such a manner that the segments 11 are opened on both sides so as to be sandwiched. It is the sea urchin configuration.

  The reinforcing inner wall 6 is arranged so that the material axis of the cylindrical body 3, in the case of FIG. 1 (a), the horizontal direction is parallel to the arrangement surface, and as can be seen in FIG. 1 (c). The cylindrical body 3 is disposed so that each end thereof is joined to a position corresponding to the longitudinal side in the transverse cross section of the inner circumferential surface of the cylindrical body 3.

  The reinforcing inner wall 6 is disposed in the front space 5 as described above, and is disposed with the position at a distance d from the tail edge 13 of the cylindrical body 3 as the rear end. As for the side, the vicinity of the partition wall 9 provided behind the chamber 9 for taking in the earth and sand from the cutter head is used as the front end, and the extending range extends to the vicinity of the partition wall 9 beyond the forefront portion of the front space 5. It is as.

  On the other hand, the tunnel excavator 1 has a space on the side separated from the cutter head 2 in the segment assembly space 4, that is, a position at a distance d from the tail edge 13 of the cylindrical body 3, and the tail of the cylindrical body 3. A space having the edge portion 13 as the rearmost portion is defined as a rear space 7, and when the segment assemblies 12, 12 relatively move from the front space 5 into the rear space, one of the segment assemblies 12, 12. The segment assembly can be connected to each other by fitting the connecting segment 21 into a spacing space 31 that extends between the open end of 12 and the open end of the other segment assembly 12 opposite thereto. is there.

  To implement the shield tunnel segment assembling method according to the present embodiment using the tunnel excavator 1, first, as shown in FIG. 3 (a), the segments 11 are formed on both sides so as to sandwich the reinforcing inner wall 6 therebetween. Assemble into U-shaped segment assemblies 12 and 12 respectively. In assembling the segment 11, the erector 8 may be operated as appropriate.

  The segment assemblies 12, 12 are assembled so as to be connected to the head of the existing segment row 32. Next, as shown in FIG. 3B, the segment assemblies 12, 12 take a reaction force from the segment assemblies 12, 12. The tunnel excavator 1 is moved forward by driving the propulsion jack 10.

  In this way, the segment assemblies 12 and 12 relatively move from the front space 5 to the rear space 7, but the reinforcing inner wall 6 is not installed in the rear space 7.

  Therefore, the open ends of the different segment assemblies 12, 12 shift from the state separated by the reinforcing inner wall 6 to the state facing each other, and a space 31 is formed between them. The segment assemblies 21 and 21 are connected to each other by fitting the connecting segment 21 in the space.

  Here, since the separation space 31 gradually expands as the stroke of the propulsion jack 10 increases, the width of the connecting segment 21 is set to, for example, one fifth of the width of the segment 11 as shown in FIG. Therefore, it is desirable that the connecting segments 21 are sequentially fitted in accordance with the extension of the stroke of the propulsion jack 10, in other words, the forward movement of the tunnel excavator 1.

  In this way, the length d of the rear space 7 can be made shorter than the width of the segment 11, and accordingly, the rearmost portion of the front space 5 is lowered, that is, the reinforcing inner wall 6 is lengthened. Therefore, the reinforcing effect of the cylindrical body 3 by the reinforcing inner wall 6 can be sufficiently enhanced.

  When the segment assemblies 12, 12 are assembled into the segment ring 33 by fitting the connecting segment 21, the propulsion jack 10 is contracted to secure a space for assembling the segment 11, and after that, a new segment is formed. 11 is assembled into segment assemblies 12,12.

  Similarly, the assembly of the segment assemblies 12 and 12 in the front space 5, the relative movement of the segment assembly to the rear space 7 due to the extension of the propulsion jack 10, and the connection of the segment assemblies 12 and 12 by the connecting segment 21. A series of steps including connection, contraction of the propulsion jack 10 and assembly of the new segment assemblies 12 and 12 are repeated.

  As explained above, according to the tunnel excavator 1 and the shield tunnel segment assembling method using the tunnel excavator 1 according to the present embodiment, the reinforcing inner wall 6 is installed in the front space 5, and the reinforcing inner wall While supporting the earth pressure from the surrounding natural ground which acts via the cylindrical trunk | drum 3, when assembling the segment 11, it inserts this reinforcement middle wall in the front space 5 in which the reinforcement middle wall 6 was installed. After first assembling the segment assemblies 12 and 12 on both sides, the segment assemblies 12 and 12 are connected to each other via the connecting segment 21 in the rear space 7 where the reinforcing inner wall 6 is not installed. Since it is assembled into the segment ring 33 by the stage assembly, the new segment at the head of the existing segment row 32 is connected as the segment ring 33 as before. While allowing to joined, it is possible to prevent the flexural deformation aspect ratio in cross section reinforces the large cylindrical body 3 with reinforcing in wall 6.

  Further, according to the tunnel excavator 1 and the shield tunnel segment assembling method using the tunnel excavator 1 according to the present embodiment, the aspect ratio of the tunnel excavator 1 can be increased by the above-described effects, so that When constructing the outer shell, it is possible to reduce the number of small-section shield tunnels to be connected, and hence the number of small-section shield tunnel connections, and thus the outer shell of a large-section tunnel can be constructed efficiently. It becomes.

  In the present embodiment, the propulsion jack 10 is extended and the connecting segments 21 are sequentially fitted. After all the connecting segments 21 are fitted, that is, after the segment ring 33 is assembled, the propulsion jack 10 is inserted. The new segment assembly 12 is assembled by contraction, but the cylindrical body 3 can be sufficiently reinforced without enlarging the reinforcing inner wall 6 so much. 7 can be provided with a margin so that the entire segment assembly 12 can remain in the rear space 7 even when the propulsion jack 10 reaches the maximum stroke. For example, while the connecting segment 21 is being fitted, the propulsion jack 10 is contracted to secure a space, It is possible to perform assembly of Lata segment assembly 12.

  Further, in this embodiment, when the propulsion jack 10 reaches the maximum stroke, the entire width of the segment assembly 12 is removed from the front space 5 and the fitting of the connecting segment 21 is completed in the rear space 7. However, the timing at which the propulsion jack 10 reaches the maximum stroke length and the timing at which the connection of the segment assemblies 12 and 12 by the fitting of the connecting segment 21 is not necessarily coincident.

  That is, due to the installation position of the propulsion jack 10, the entire width of the segment assembly 12 does not enter the rear space 7 and a part remains in the front space 5, and all the connecting segments 21, 5 in the above-described embodiment. Even if it is not possible to fit all the connecting segments 21 into the separation space 31 in the same process, the remaining connection segments 21 are formed in the next process because the separation space 31 is generated in the next process. It ’s enough.

  Although not particularly mentioned in the present embodiment, after assembling into the segment assemblies 12 and 12, depending on the situation, the shape may not be stable, and there is a concern that the facing distance between the open ends may be shortened. In addition, after connecting them into the segment ring 33, a reinforcing column may be required in the segment ring in order to support earth pressure from the surrounding natural ground.

  In that case, after assembling the segment 11 into the segment assembly 12, as shown in FIG. 4, as shown in FIG. 4, the end portions are joined to the inner surfaces facing each open end in the segment assembly 12 in the front space 5. What is necessary is just to install the reinforcement pillar 41 as a support work.

  According to such a configuration, the reinforcing column 41 for supporting the earth pressure from the surrounding natural ground can be effectively used as a support for maintaining the shape of the segment assembly 12 during the segment assembly. Become.

  Here, when the reinforcing column 41 is installed on the opposed inner surface of the open end of the segment assembly 12 as a support for the segment assembly 12, the connecting segment 21 is fitted into the separation space 31 as shown in FIG. Therefore, it is possible to adopt a configuration in which the connecting segment insertion mechanism 51 is disposed in the rear space 7.

  The connecting segment insertion mechanism 51 has guide rails 53, 53 projecting from the side of the telescopic jack body, and the guide rails slide on the guide receivers 52, 52 provided on the opposite side surfaces of the reinforcing column 41. By placing it freely, it can move in the front-rear direction, that is, along the material axis direction of the cylindrical body 3.

  In such a configuration, the connecting segments 21 may be sequentially fitted while the connecting segment insertion mechanism 51 is moved forward in accordance with the extension of the stroke of the propulsion jack 10, that is, the forward movement of the tunneling machine 1.

  On the other hand, as a measure for maintaining the shape of the segment assembly 12, it is possible to adopt another modification shown in FIGS. 6 and 7 instead of the above-described modification. In the tunnel excavator according to the modification shown in these drawings, the shape holding mechanisms 64 configured to hold the shape of the segment assembly 12 are respectively installed on both sides of the reinforcing inner wall 6, and the shape holding The mechanism is such that the elastic member 62 is erected on the upper beam of the rectangular frame 61 and the elastic member 63 is vertically suspended on the lower beam, and the respective elastic members are extended so that their tips are connected to the open ends of the segment assembly 12. The shape of the segment assembly can be maintained by pressing against the opposing inner surface.

  In this modified example, as shown in FIGS. 6 (a) and 7 (a), after assembling the segment assemblies 12 on both sides of the reinforcing inner wall 6, the open ends of the segment assemblies 12, 12 are assembled. The shape holding mechanisms 64 and 64 are respectively installed, and then the telescopic members 62 and 63 are operated, so that a load in the separation direction is loaded on the opposed inner surfaces of the open ends of the segment assemblies 12 and 12 in the front space 5. The shape of the segment assembly is retained.

  Next, as shown in FIG. 6B, the propulsion jack 10 is operated to advance the tunnel machine 1.

  Then, as described in the above embodiment, the segment assemblies 12 and 12 relatively move from the front space 5 to the rear space 7, but the reinforcing inner wall 6 is not installed in the rear space 7.

  For this reason, the open ends of the different segment assemblies 12, 12 shift from a state separated by the reinforcing inner wall 6 to a state facing each other, and a space 31 is formed between them. 7 (a), the segment segments 21 and 21 are connected to each other and assembled into the segment ring 33 by fitting the connecting segment 21 into the spacing space 31. As shown in FIG.

  Here, as in the above-described embodiment, the spacing space 31 gradually expands as the stroke of the propulsion jack 10 increases, so that the width of the connecting segment 21 is set to the width of the segment 11 as shown in FIG. For example, by setting it to 1/5, it is configured such that the connecting segments 21 are sequentially fitted in accordance with the extension of the stroke of the propulsion jack 10, in other words, the forward movement of the tunnel excavator 1. Is desirable.

  Next, when the connecting step is completed, as shown in FIG. 6C, the propulsion jack 10 is contracted to secure a space, and the new segment assembly 12 is assembled in the space, and the expansion members 62 and 63 are also assembled. The shape holding mechanism 64, 64 is moved to the front space 5 and the shape holding mechanism is installed in the newly assembled segment assemblies 12, 12.

  The shape holding mechanism 64 is configured so that the rectangular frame 61 can be moved smoothly forward by attaching the rectangular frame 61 to a horizontal guide rail (not shown) provided on the side surface of the reinforcing inner wall 6 so as to be horizontally movable. It is desirable to leave.

  Hereinafter, similarly, the assembly of the segment assembly 12, the shape maintenance of the segment assembly by installing the shape holding mechanism 64, the relative movement to the rear space 7 by the extension of the propulsion jack 10, and the segment assembly 12 by the connecting segment 21. , 12, unloading of the shape holding mechanism 64, and transfer of the shape holding mechanism 64 and installation to the new segment assembly 12 are repeated.

  When the segment ring 33 needs to be reinforced against earth pressure from the surrounding natural ground, as shown in FIGS. 6 (c) and 7 (b), the end portions are joined to the opposing inner surfaces of the segment ring, respectively. The reinforcing pillar 65 may be installed as described.

  Here, if each end of the reinforcing column 65 is joined to the connecting segment 21, the reinforcing column 65 can also be used as a fitting reinforcement of the connecting segment 21.

DESCRIPTION OF SYMBOLS 1 Tunnel machine 2 Cutter head 3 Cylindrical body 4 Segment assembly space 5 Front space 6 Reinforcement inner wall 7 Back space 11 Segment 12 Segment assembly 21 Connection segment 31 Separation space 33 Segment ring 41 Reinforcement pillar 51 Connection segment insertion mechanism 64 Shape retention mechanism 65 Reinforcing pillar

Claims (7)

In a segment assembling method for a shield tunnel, a segment assembling space is provided in a rear interior of a cylindrical body provided with a tunnel head and provided with a cutter head at a front opening, and the segments are assembled in the segment assembling space.
In the segment assembly space, the material axis of the cylindrical body is arranged in parallel with the front space on the side close to the cutter head, and the inner surface of the cylindrical body is an opposed inner peripheral surface. Assembling the segments into a segment assembly having a shape opened to the reinforcing inner wall side on both sides so as to sandwich the reinforcing inner wall arranged so that each end is joined to the position corresponding to the longitudinal side,
In the rear space on the side separated from the cutter head, the connecting segment is fitted into a spacing space that belongs to a different segment assembly among the segment assemblies and extends between open ends facing each other. A segment assembly method for a shield tunnel, wherein the segment assemblies are connected to each other to form a segment ring. 2. The shield tunnel segment assembling method according to claim 1, wherein the reinforcing pillars are installed so that the end portions are respectively joined to the inner surfaces facing each open end of the segment assembly in the front space. The shape of the segment assembly is maintained by loading a separation direction load on the inner surface of each open end of the segment assembly in the front space, and after the connecting step, the separation direction load is removed in the rear space. The method for assembling a segment of a shield tunnel according to claim 1, wherein the reinforcing columns are installed so that the ends are respectively joined to the opposing inner surfaces of the segment ring. The shield tunnel segment assembling method according to claim 3, wherein the reinforcing pillars are installed so that each end is joined to an opposing inner surface of the connecting segment. In a tunnel excavator in which a segment assembly space for assembling a segment is provided in the rear interior of a cylindrical body in which a cutter head is installed in a front opening,
In the segment assembly space, the material axis of the cylindrical body is arranged in parallel with the front space on the side close to the cutter head, and the inner surface of the cylindrical body is an opposed inner peripheral surface. A segment set having a shape in which the reinforcing inner wall is arranged so that the ends are joined at positions corresponding to the longitudinal side, and the segments are opened on both sides of the reinforcing inner wall so as to sandwich the reinforcing inner wall. A tunnel excavator configured to be able to be assembled in three dimensions and configured to be able to connect the segment assemblies to each other in a rear space on the side separated from the cutter head. Among the segment assemblies, the connecting segments that can be connected to each other by being fitted in the spacing spaces that belong to the different segment assemblies and that extend between the open ends that face each other are separated from each other. A connecting segment insertion mechanism that fits into a space is disposed in the rear space, and the connection segment insertion mechanism is disposed on a reinforcing column that is disposed so that each end is joined to an inner surface facing each open end in the segment assembly. The tunnel digging machine according to claim 5, which is attached so as to be movable in the front-rear direction. A shape holding mechanism configured to hold the shape of the segment assembly by pressing the distal end of the expansion / contraction member against the inner surface facing each open end of the segment assembly from the rear space to the front space. The tunnel digging machine according to claim 5, wherein the tunnel digging machine is arranged in the segment assembly space so as to be relocatable.

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