JP2005299087A - Junction coupling of tunnel, junction structure of tunnel and junction method of tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To safely and efficiently merge tunnels, to share parts, to reduce the term of works and remarkably reduce the cost of works, and to cope with various angles of confluence. <P>SOLUTION: This junction coupling 1 is used at the initial stage of confluence, and provided with a main track side socket 8 storing a permanent structure segment 4 of the main track tunnel 2 side, and a lamp side socket 9 storing the permanent structure segment 4 of the lamp tunnel 3 side. The storing spaces 12, 13 of both sockets 8, 9 are preset larger. In the junction structure 30 used at the middle stage of confluence, a blade-type segment 31 is used in common, so that a gap is adjusted by the lamp side taper segment 32 and a space liner 33. In the junction structure 40 used at the final stage of confluence, the main track side taper segment 41, the lamp side taper segment 42 and a taper liner 44 are used. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tunnel junction joint, a tunnel junction structure, and a tunnel junction method that are used when a ramp tunnel is obliquely entered into a main tunnel to join the main tunnel to the main tunnel.

  The idea of causing the lamp tunnel to enter the main tunnel at an angle and joining the main tunnel with the main tunnel has been conventionally proposed as shown in Patent Document 1 below. However, when it is put into practice, there are various problems as shown below, which are extremely difficult. First of all, conventionally, auxiliary methods such as the freezing method have been widely used. That is, the freezing method is a pretreatment performed for the purpose of soil improvement in order to facilitate excavation and excavation by a shield machine, but conventionally not only the confluence of the main tunnel and the ramp tunnel, but before and after, It was carried out in a wide range in the circumferential direction of the main tunnel or lamp tunnel.

  Secondly, at the junction of the main tunnel and the ramp tunnel, a large occupied area was required for the junction construction. That is, in addition to the occupied area occupied by the main tunnel and the lamp tunnel itself, an occupied area of a large joining segment for joining the main tunnel and the lamp tunnel, an occupied area for supporting work for assembling the joining segment, and the like were necessary. . In addition, the confluence side portion of the permanent structure segment constituting the wall of the main tunnel is replaced by a temporary cutable segment over the entire length of the main tunnel to facilitate cutting with a shield machine. The occupying area of the replacement part of the possible segment is extremely large, and there are a lot of parts that are not actually cut, which is not an efficient and economical construction method.

  Thirdly, dismantling work for large segments was necessary, leading to an increase in construction period. In other words, when the main tunnel and the ramp tunnel are merged, the main tunnel side and the ramp tunnel side are opposed to each other, and a large opening is provided to dismantle many unnecessary segments and to prevent deformation of the main tunnel. It was necessary to remove a large number of support works. In addition, the dismantling segment and the supporting work to be removed extend not only to the merging part, but also to the front, back, and periphery, leading to enormous labor and lengthening of the construction period. In addition, with the construction form as described above, the merge between the main tunnel and the lamp tunnel is limited to the horizontal direction or the like, and the degree of freedom in the merge direction is extremely limited.

JP 2000-213278 A

  The present invention has been made in view of the existence of such background technology and the problems of the background technology. When joining the lamp tunnel to the main tunnel, the construction can be performed safely and efficiently. To provide a very useful tunnel junction joint, tunnel junction structure and tunnel junction method that can shorten the construction period and greatly reduce the construction cost by making common use, and can cope with various merging angles Is an issue.

  In order to solve the above-described problem, the joint joint of the tunnel according to the first aspect of the present invention is a tunnel joint used when the ramp tunnel is obliquely entered with respect to the main tunnel and the lamp tunnel is joined to the main tunnel. A joint joint of the tunnel, wherein the joint joint of the tunnel is used in an initial stage of merging of the main tunnel and the lamp tunnel, and is connected to a main socket on the main tunnel side that can accommodate a cut-off end of a main line side permanent segment; This is a V-shaped reinforced joint member with a lamp-side socket that can accommodate the cut-off end of the lamp-side permanent segment, and the main-side socket and the lamp-side socket have a large storage space in advance. It is characterized by being.

  According to the first aspect of the present invention, since the main line side socket and the lamp side socket are integrally provided, the main line tunnel and the lamp tunnel can be bonded only by using the same joint joint one above the other. be able to. In addition, since the housing space for the main line side socket and the lamp side socket is set to be large in advance, it is possible to cope with a change in the angle of entry of the separation end portion of each permanent segment caused by the progress of merging, an assembly dimension error, and the like.

The tunnel joint according to the second aspect of the present invention, in the first aspect, fills the inner corners in the inner corners of the main line side socket and the lamp side socket which are expanded in a V shape in the front view. A reinforcing connection part integral with the main line side socket and the lamp side socket is provided.
Moreover, the tunnel joint according to the third aspect of the present invention is the main joint on the inner side of the main line side socket and the lamp side socket which are expanded in a V shape in the front view. And a reinforcing bracket for connecting the opposing wall surfaces of the lamp-side socket.

  According to these 2nd or 3rd aspects of the present invention, by providing the reinforcing connecting portion or the reinforcing bracket, the stress concentration applied to the inner corner portions of the main line side socket and the lamp side socket is dispersed. In addition, an increase in the load applied to the lamp tunnel itself can be suppressed to a small level, so that it is not necessary to increase the thickness of the constituent segments so much that the cost increase can be suppressed.

  A tunnel junction structure according to a fourth aspect of the present invention is a tunnel junction structure used when a ramp tunnel enters obliquely into a main tunnel and the lamp tunnel merges with the main tunnel, The tunnel junction structure is used in the early stage of the merge of the main tunnel and the lamp tunnel. The upper and lower cut ends of the main line permanent segment on the main tunnel side and the upper and lower cut ends of the lamp side permanent segment on the lamp tunnel side are used. The present invention is characterized by comprising the joint joint of the tunnel according to any one of the first to third aspects to be joined, and the reinforcing support column erected between the joint joints of the upper and lower tunnels.

  According to the fourth aspect of the present invention, since the main line side socket and the lamp side socket are integrally provided, the main line tunnel and the lamp tunnel are bonded together by using the same joint joint one above the other. be able to. In addition, since the housing space for the main line side socket and the lamp side socket is set to be large in advance, it is possible to cope with a change in the angle of entry of the separation end portion of each permanent segment caused by the progress of merging, an assembly dimension error, and the like. In the initial stage of merging, the angle (intersection angle) at the junction of the main tunnel segment and the ramp tunnel segment is an acute angle, so stress concentration occurs at the merging section. The structure of the tunnel is also strengthened by the presence of pillars.

  A tunnel junction structure according to a fifth aspect of the present invention is a tunnel junction structure used when a lamp tunnel is obliquely entered with respect to a main tunnel and the lamp tunnel merges with the main tunnel, The tunnel junction structure is used in the middle stage of merging of the main tunnel and the ramp tunnel, and the common airfoil segment joined to the upper and lower separated ends of the main line permanent segment on the main tunnel side, and the ramp tunnel side A lamp-side taper segment joined to the upper and lower cut-off ends of the lamp-side permanent segment, and an adjustment liner that fills a gap between the airfoil segment and the lamp-side taper segment. .

  According to the fifth aspect of the present invention, the use of the common airfoil segment simplifies the joining operation and improves the working efficiency. It also contributes to the reduction of parts costs. The interval between the cut-off end of the ramp-side permanent segment and the airfoil segment, which changes from moment to moment as the merging progresses, is filled with the ramp-side taper segment, and the interval between the airfoil segment and the ramp-side taper segment is for adjustment. Since it is filled with the liner, the complicated joining shape of the joining portion can be formed relatively easily by using the common parts and using the adjusting member in combination.

A tunnel junction structure according to a sixth aspect of the present invention is the tunnel junction structure according to the fifth aspect, wherein the airfoil segment is located on the main tunnel side and is formed with a curved junction formed by the same curvature as the main tunnel, and the lamp tunnel. And a horizontal joint provided so as to protrude horizontally toward the cut-off end of the lamp-side permanent segment.
According to the sixth aspect of the present invention, since the curved joint portion is formed with the same curvature as that of the main tunnel, it is joined well with the main line-side permanent segment. In addition, since the horizontal joint is provided so as to protrude horizontally toward the cut-off end of the lamp-side permanent segment, no concavity is formed in the confluence, so stress concentration at the confluence is reduced. The mechanical strength of the tunnel is improved. Specifically, it becomes possible to eliminate the reinforcing column.

  A tunnel junction structure according to a seventh aspect of the present invention is a tunnel junction structure used when a ramp tunnel enters obliquely into a main tunnel and the lamp tunnel merges with the main tunnel, The junction structure of the tunnel is used at the final stage of merging of the main tunnel and the ramp tunnel, and the main side taper segment joined to the upper and lower separated ends of the main line permanent segment on the main tunnel side, and the lamp side on the lamp tunnel side The lamp-side taper segment joined to the upper and lower cut-off ends of the permanent segment, and an adjustment liner that fills the gap between the main line-side taper segment and the lamp-side taper segment are provided.

  According to the seventh aspect of the present invention, since the main-line-side taper segment and the ramp-side taper segment are used, it is possible to cope with the transition of the interval that changes every moment as the merging progresses. Further, since the interval between the main line side taper segment and the lamp side taper segment is filled with the adjusting liner, a complicated joint shape of the merge portion is formed relatively easily.

  The tunnel junction structure according to the eighth aspect of the present invention is the tunnel junction structure according to the seventh aspect, wherein the main line side taper segment and the ramp side taper segment are made common, and the main line side permanent segment and the main line side taper segment are between. Is characterized in that an adjustment main line side parallel segment and an adjustment lamp side parallel segment are provided between the lamp side permanent segment and the lamp side taper segment, respectively.

  According to the eighth aspect of the present invention, by using the main line side taper segment and the ramp side taper segment which are respectively made common, the joining operation is simplified and the working efficiency is improved. It also contributes to the reduction of parts costs. In addition, the change in the distance between the main taper segment and the ramp taper segment caused by the progress of the merge is filled with the adjustment main line parallel segment and the ramp side parallel segment, so that the complicated joint shape of the merge part is Molding is relatively easy due to the common use of parts and the use of adjustment members.

  The tunnel joining method according to the ninth aspect of the present invention is a method for joining a main tunnel and a lamp tunnel before and at the beginning of the merge when the ramp tunnel is obliquely entered into the main tunnel and the ramp tunnel is merged with the main tunnel. A main tunnel construction process for constructing a main tunnel having a cutable portion that can be cut by a shield machine at a junction with a ramp tunnel of the main tunnel, the main tunnel construction step being used in a stage A filling material filling step for filling the main tunnel with the filling material after installing a circular liner for the communication passage in the inside, and a soil freezing step for freezing the soil around the junction of the main tunnel and the lamp tunnel, , Cutting the soil frozen part and the cutable part of the main tunnel with the shield machine Ramp tunnel entry construction process that digs up while constructing the tunnel and enters the main tunnel obliquely in the traveling direction, and the segment of the part of the entered ramp tunnel facing the main tunnel is removed from the lamp side permanent segment and opened. A side surface communication step of removing the filling material around the opening, removing the cuttable portion remaining without being cut of the main line tunnel from the main line side permanent segment, and communicating the two tunnels on the side surfaces; A joint joint connecting step for connecting the joint joint of the tunnel according to any one of the above aspects to the upper and lower cut-off ends of the main line-side permanent segment and the upper and lower cut-off ends of the lamp-side permanent segment; A joining step in which reinforcing struts are erected between connecting joints, spacers are inserted into the gaps in the accommodation space in the joint joint, and fixed. And it is characterized in Rukoto.

  According to the ninth aspect of the present invention, when the excavation is carried out while constructing the ramp tunnel by the shield machine by adopting the segment having the cuttable part, the cutable part on the main tunnel side is cut together with the natural ground. It is possible to join the lamp tunnels at a shallow angle close to parallel to the main tunnel. Further, since the cuttable portion remaining after the cutting can be easily removed, the main tunnel and the lamp tunnel are smoothly joined. In addition, by filling the main tunnel with the filling material, it is possible to dig the ramp tunnel as in the case of natural excavation, and it is possible to prevent deformation of the main tunnel that occurs during excavation. In addition, by providing a circular liner in the main tunnel, a work passage can be secured in the main tunnel after filling the filling material, and even when the main tunnel is under construction, the lamp tunnel can be joined.

  Moreover, since the main line side socket and the lamp side socket are integrally provided, the main line tunnel and the lamp tunnel can be joined by using the same joint joint one above the other. Moreover, since the storage space of the main line side socket and the lamp side socket is set to be large in advance, it is possible to cope with a change in the approach angle of the separation end portion of each permanent segment caused by the progress of merging, an assembly dimension error, and the like. Since the main line side socket and the lamp side socket are integrally provided, the main line tunnel and the lamp tunnel can be joined only by using the same joint joint one above the other. Also, at the initial stage of merging, the angle at the junction of the main tunnel segment and the ramp tunnel segment increases, so stress concentration occurs at the merging section, but there is a reinforcing strut standing between the joints. The structure of the tunnel is also strengthened.

  The tunnel joining method according to the tenth aspect of the present invention is used in the middle stage of the merge of the main tunnel and the lamp tunnel when the ramp tunnel is obliquely entered with respect to the main tunnel and the ramp tunnel is merged with the main tunnel. A main tunnel construction process for constructing a main tunnel with a cutable portion that can be cut by a shield machine at the junction of the main tunnel with the ramp tunnel, and contact within the main tunnel After the circular liner for the passage is installed, the filling material filling step for filling the filling material into the filling tunnel, the soil freezing step for freezing the soil around the junction of the main tunnel and the lamp tunnel, and the shield Ramp tunnel by cutting the soil frozen part and the cuttable part of the main tunnel with an excavator The ramp tunnel approach construction process that digs up while constructing and enters the main tunnel obliquely in the direction of travel, and the segment of the part of the entered ramp tunnel facing the main tunnel is removed from the permanent segment on the lamp side and opened. A side surface communication step of removing the filling material around the opening and removing the remaining cuttable portion of the main line tunnel from the main line side permanent segment so that both tunnels communicate with each other on the side surface, and the main line side permanent installation An airfoil segment joining step for joining the airfoil segments common to the respective permanent segments adjacent in the excavation direction to the upper and lower cut ends of the segment, and upper and lower cut ends of the lamp side permanent segment In addition, individual size labels configured to form a series of tapered shapes for each of the permanent segments adjacent in the excavation direction. A ramp-side taper segment joining step for joining the lamp-side taper segment, and an adjustment liner loading step for filling the gap by filling the adjustment liner between the airfoil segment and the ramp-side taper segment. It is a feature.

  According to the tenth aspect of the present invention, by using the common airfoil segment and the ramp-side tapered segment of the individual shape with the tapered shape, the joining operation is simplified and the working efficiency is improved. It also contributes to the reduction of parts costs. The interval between the cut-off end of the ramp-side permanent segment and the airfoil segment, which changes from moment to moment as the merging progresses, is filled with the individual-size ramp-side taper segment, and the interval between the airfoil segment and the ramp-side taper segment. Is filled with the adjustment liner, the complicated joint shape of the junction is relatively easily formed by using a common part and using the adjustment member together.

  The tunnel joining method according to the eleventh aspect of the present invention is used in the final stage of the merge of the main tunnel and the lamp tunnel when the ramp tunnel is obliquely entered into the main tunnel and the ramp tunnel is merged with the main tunnel. A main tunnel construction process for constructing a main tunnel with a cutable portion that can be cut by a shield machine at the junction of the main tunnel with the ramp tunnel, and contact within the main tunnel After the circular liner for the passage is installed, the filling material filling step for filling the filling material into the filling tunnel, the soil freezing step for freezing the soil around the junction of the main tunnel and the lamp tunnel, and the shield Ramp tunnel by cutting the soil frozen part and the cuttable part of the main tunnel with an excavator The ramp tunnel approach construction process that digs up while constructing and enters the main tunnel obliquely in the direction of travel, and the segment of the part of the entered ramp tunnel facing the main tunnel is removed from the permanent segment on the lamp side and opened. A side surface communication step of removing the filling material around the opening and removing the remaining cuttable portion of the main line tunnel from the main line side permanent segment so that both tunnels communicate with each other on the side surface, and the main line side permanent installation A main line side taper segment joining step of joining individual size main line side taper segments configured to form a series of taper shapes to the respective permanent segments adjacent to each other in the excavation direction at the upper and lower cut ends of the segments; The upper and lower cut-off ends of the lamp-side permanent segment, with respect to each of the permanent segments adjacent in the digging direction A ramp-side taper segment joining process for joining individual-sized ramp-side taper segments configured to form a series of taper shapes, and an adjustment liner is loaded between the main-side taper segment and the ramp-side taper segment to provide a gap. And an adjustment liner loading step for filling in.

  According to the eleventh aspect of the present invention, since the main line side taper segment and the ramp side taper segment of the tapered shape and the individual sizes are used, it is possible to cope with the transition of the interval that changes every moment as the merging progresses. Further, since the interval between the main line side taper segment and the lamp side taper segment is filled with the adjusting liner, a complicated joint shape of the merge portion is formed relatively easily.

  The tunnel joining method according to the twelfth aspect of the present invention is used at the final stage of merging of the main tunnel and the lamp tunnel when the ramp tunnel is obliquely entered into the main tunnel and the lamp tunnel is merged with the main tunnel. A main tunnel construction process for constructing a main tunnel having a cutable portion that can be cut by a shield machine at a junction with a ramp tunnel of the main tunnel, and a connecting passage in the main tunnel. A filling material filling step for filling the main line tunnel with the filling material, a soil freezing step for freezing soil around the junction of the main tunnel and the ramp tunnel, and the shield tunneling Machine to cut the soil frozen part and the cutable part of the main tunnel to The ramp tunnel approach construction process that digs up while working and enters into the main tunnel obliquely in the direction of travel, and the segment of the part of the entered ramp tunnel that faces the main tunnel is removed from the lamp-side permanent segment and opened. A side surface communication step of removing the filling material around the opening and removing the remaining cuttable portion of the main line tunnel from the main line side permanent segment so that both tunnels communicate with each other on the side surface, and the main line side permanent installation Main line side taper segment joint that joins the main line side taper segment common to the upper and lower cut ends of the segment through the main line side parallel segment for individual size adjustment for each of the permanent segments adjacent in the direction of excavation Each of the permanent segments adjacent to each other in the digging direction at the upper and lower separation ends of the lamp-side permanent segment A ramp side taper segment joining process that joins a common ramp side taper segment via a ramp side parallel segment for individual size adjustment, and an adjustment liner is loaded between the main line side taper segment and the ramp side taper segment And an adjustment liner loading step for filling the gap.

  According to a twelfth aspect of the present invention, the main line side parallel segment for adjusting the individual size and the common main line side taper segment, and the lamp side parallel segment for adjusting the individual size and the common lamp By using the side taper segment, the joining operation is simplified and the working efficiency is improved. It also contributes to the reduction of parts costs. In addition, since the change in the spacing between the main taper segment and the ramp taper segment caused by the progress of the merge is filled with each parallel segment for adjustment, the complicated joint shape of the merge part is shared by parts. It is formed relatively easily by using the adjusting member in combination.

  According to the present invention, when the lamp tunnel is merged with the main tunnel, the construction can be safely performed by using a filling material or the like, and the efficiency is increased by using the common member and the adjustment member together. Can be shortened and construction costs can be significantly reduced. In addition, by adopting a segment that can be cut as it is with a shield machine, it is possible to cope with various merging angles of main tunnels and ramp tunnels, and a drastic reduction in the occupied area used for construction makes it possible to economically merge tunnels. Construction becomes possible.

  Hereinafter, a tunnel joint, a tunnel joint structure, and a tunnel joining method according to the present invention will be described. In the following description, a case will be described in which a main tunnel with a large diameter in the middle of construction, which has started excavation in advance, is merged by following a ramp tunnel with a small diameter at an approach angle close to parallel. . As an order of explanation, first, the configuration of the junction joint of the tunnel of the present invention will be described as a first embodiment. Next, the configuration of the junction structure of the tunnel of the present invention taken as the second embodiment at the early stage of merge, the configuration of the tunnel junction structure of the present invention taken at the middle stage of the merge as Example 3, and the merge as the fourth embodiment The structure of the junction structure of the tunnel of the present invention taken at the final stage will be described.

  Further, following this, the configuration of the tunnel joining method of the present invention taken as a fifth embodiment before and at the initial stage of joining as Example 5, the configuration of the tunnel joining method of the present invention taken at the middle stage of joining as Example 6, The configuration of the tunnel joining method of the present invention, which is adopted at the final stage of merging, will be described as a seventh embodiment, and finally, another embodiment of the present invention will be briefly described.

  FIG. 1 is a perspective view schematically showing a tunnel junction structure and a tunnel junction method according to the present invention. FIG. 2 is an enlarged perspective view showing a tunnel junction structure taken in the initial stage of merging. FIG. 3 is a perspective view showing a configuration of a tunnel joint according to the present invention, and FIG. 4 is a front view showing another embodiment of the tunnel joint. FIG. 5 is an enlarged perspective view showing a tunnel junction structure taken at the middle stage of merging, and FIG. 6 is an enlarged perspective view showing a tunnel junction structure taken at the last stage of merging. FIG. 7 is a perspective view showing another embodiment of the tunnel junction structure taken at the final stage of merging. FIG. 8 is an explanatory view showing the structure of the tunnel joining method of the present invention taken before and at the initial stage of joining, and FIG. 9 is a column showing the outline of the tunnel joining structure taken at the early stage of joining. They are a cross-sectional view (a) in the opening space, an AA cross-sectional view (b) in the same drawing (a), and a cross-sectional view (c) in the column receiving space. FIG. 10 is a perspective view showing the configuration of the permanent segment. FIG. 11 is an enlarged perspective view of a main part corresponding to the structure of FIG. 7, in which only the upper joint part of both tunnels is shown, and the lower part is not shown.

[Example 1]
The junction joint 1 of the tunnel of the present invention is used in an initial stage of merging in which the ramp tunnel 3 is made to enter the main tunnel 2 obliquely and the main tunnel 2 is merged with the main tunnel 2 as shown in FIG. The main tunnel 2 and the ramp tunnel 3 are excavated in the natural ground A by using an unillustrated excavating machine called a shield excavator to form a horizontal cross-section with a circular cross section. In addition, a cylindrical earth retaining wall is formed behind the shield machine by a curved rectangular main line side permanent segment 4a or a lamp side permanent segment 4b.

  As these permanent segments 4a and 4b, ductile or synthetic segments having high mechanical strength are used as an example, and the inner wall surface of the main line side permanent segment 4a on the main line tunnel 2 side is formed of a steel material for reinforcement. A beam 5 is provided along the inner wall surface. Further, a part of the main line side permanent segment 4a and the reinforcing inner beam 5 located at the junction with the ramp tunnel 3 is replaced by a temporary cuttable part 6 as shown in FIG. 1 or FIG. ing.

The material of the cutable portion 6 is a composite material in which a plastic foam is reinforced with inorganic fibers, and a plastic foam made of high-quality urethane resin is reinforced with inorganic fibers made of long glass fibers. In this embodiment, commercially available lightweight corrosion-resistant structural material, Eslon Neo Lamper FFU (Fiber Reinforced
Foamed Urethane Sekisui Chemical Co., Ltd.) is used. Of course, the material is not limited to this.

  On the other hand, a part of the lamp side permanent segment 4b on the side of the lamp tunnel 3 located at the junction with the main tunnel 2 is replaced by a temporary metal segment 7 as an example as shown in FIG. . Then, after the ramp tunnel 3 joins the main line tunnel 2, the cuttable portion 6 and the temporary segment 7 are removed, and the joint joint 1 of the tunnel of the present invention separates the main line side permanent segment 4a and the reinforcing inner beam 5 from each other. It is attached and joined to the end and the cut-off end of the lamp side permanent segment 4b.

  The junction joint 1 of the tunnel of the present invention is a reinforced joint member having a V shape in a front view provided with a main line side socket 8 and a lamp side socket 9, and in this embodiment, the main line side socket 8 and the lamp side socket 9 are also provided. The inner corner part 10 formed between the main line side socket 8 and the lamp side socket 9 is filled with the reinforcing connecting part 11 so as to improve the mechanical strength. Further, the main line side socket 8 is a member that accommodates the cut end portions of the main line side permanent segment 4a and the reinforcing inner beam 5, and the lamp side socket 9 is a member that accommodates the cut end portions of the lamp side permanent segment 4b.

  The accommodation space 12 of the main line side socket 8 and the accommodation space 13 of the lamp side socket 9 are set larger in advance than the distal ends of the segments 4a and 4b inserted therein. This is to cope with a change in an angle between the main line side permanent segment 4a and the reinforcing inner beam 5 caused by the progress of the merge, an assembly dimension error, and the like. The main line side permanent segment 4a and the reinforcing inner beam 5 housed in the housing space 12 and the lamp side permanent segment 4b housed in the housing space 13 are respectively connected by fastening means 14 composed of bolts and nuts. It is fixed to the main line side socket 8 and the lamp side socket 9. And it fixes firmly by inserting the iron plate C as a spacer in the clearance gap formed in the storage space 12 and the storage space 13. FIG. The side surfaces Ss of the segments 4a and 4b and the side surfaces SB of the sockets 8 and 9 are formed flush with each other. That is, the tip portions inserted into the sockets 8 and 9 of the segments 4a and 4b are formed narrower than the other portions through the step as shown in FIG.

[Example 2]
The tunnel junction structure 20 according to the second embodiment is used in the initial stage of the merge of the main tunnel 2 and the lamp tunnel 3. Specifically, the tunnel joint structure 20 of the present embodiment has the above-described tunnel joint 1 arranged vertically, and a reinforcing column 21 made of a square steel pipe or a section steel material is provided between the upper and lower joints 1. It is configured by installing. As shown in FIG. 2 or FIG. 9 (b), a plurality of reinforcing struts 21 are erected at appropriate intervals, whereby stress concentration at the joining portion having the recessed structure portion that occurs at the initial stage of joining. Ensures mechanical strength to withstand.

[Example 3]
The tunnel junction structure 30 according to the third embodiment shown in FIG. 5 is used in the middle stage of the merge of the main tunnel 2 and the ramp tunnel 3. Specifically, the tunnel junction structure 30 of the present embodiment includes an airfoil segment 31, a ramp-side taper segment 32, and a space liner 33 as an adjustment liner. The airfoil segment 31 is a member joined to the upper and lower cut-off ends of the main line side permanent segment 4a, and is common regardless of the application location. That is, it is common to the main line side permanent segments 4a adjacent to each other in the digging direction of the shield machine. Specifically, it is located on the main tunnel 2 side and is formed with a curved joint 34 formed by the same curvature as that of the main tunnel 2, and is located on the lamp tunnel 3 side, toward the cut-off end of the lamp-side permanent segment 4b. It is comprised by providing the horizontal junction part 35 provided so that it may protrude horizontally.

  The lamp-side taper segment 32 is a member joined to the upper and lower cut-off ends of the lamp-side permanent segment 4b. The ramp-side taper segment 32 is a flat plate member, and its planar shape is a taper shape corresponding to the entry angle of the lamp tunnel 3 and the like. That is, the lamp-side taper segments 32 are individually sized so as to form a series of taper shapes with respect to the lamp-side permanent segments 4b, 4b,... Adjacent to the shield machine in the digging direction. Further, since the upper and lower cut-off ends of the lamp-side permanent segment 4b are positioned at the upper and lower limits of the lamp tunnel 3, the lamp-side taper segment 32 extends horizontally from the cut-off end of the lamp-side permanent segment 4b. It is provided and joined to the horizontal joint 35 in the airfoil segment 31.

  The space liner 33 is an adjustment member that fills the gap between the airfoil segment 31 and the ramp-side taper segment 32. Accordingly, the width dimension is adjusted and bonded so as to match the gap as appropriate in accordance with an assembly dimension error or the like.

[Example 4]
The tunnel junction structure 40 according to the fourth embodiment shown in FIG. 6 is used at the final stage of the merge of the main tunnel 2 and the ramp tunnel 3. Specifically, the tunnel junction structure 40 of the present embodiment is configured by including a main line side taper segment 41, a lamp side taper segment 42, and a taper liner 44 as an adjustment liner. The main line side taper segment 41 is a member joined to the upper and lower cut ends of the main line side permanent segment 4a. The main line side taper segment 41 is a flat plate member, and the planar shape is a taper shape corresponding to the entry angle of the lamp tunnel 3 and the like. That is, the main line side taper segments 41 of individual sizes configured to form a series of taper shapes with respect to the main line side permanent segments 4a, 4a,... Adjacent to each other in the excavation direction of the shield machine.

  The lamp-side taper segment 42 is a member joined to the upper and lower cut-off ends of the lamp-side permanent segment 4b. The ramp side taper segment 42 is a flat plate-like member like the main line side taper segment 41, and the planar shape is a taper shape corresponding to the entry angle of the lamp tunnel 3 and the like. That is, the lamp-side taper segments are individually sized so as to form a series of taper shapes with respect to the lamp-side permanent segments 4b, 4b,... Adjacent to each other in the digging direction of the shield machine.

  The taper liner 44 is a member that is loaded as an adjustment liner between the airfoil segment and the ramp-side taper segment and fills the gap. The taper liner 44 is joined so as to have an optimum width dimension or taper corresponding to an assembly dimension error, an approach angle of the lamp tunnel 3, and the like.

As shown in FIGS. 7 and 11, it is also possible to use a tunnel junction structure 40 that is common as a main line side taper segment 41 and a lamp side taper segment 42.
In this case, a series of the main line side permanent segments 4a, 4a,... Adjacent to each other in the digging direction of the shield machine between the main line side permanent segment 4a and the main line side taper segment 41. Main line side parallel segments 45a, 45b,... For adjusting individual sizes, each having a tapered shape, are provided. Similarly, between the lamp side permanent segment 4b and the lamp side taper segment 42, a series of tapered shapes are formed for the lamp side permanent segments 4b, 4b,. Each of the lamp-side parallel segments 46a, 46b,... For adjusting the individual size is provided so as to cope with a change in the interval caused by the progress of merging.

[Example 5]
The tunnel joining method according to the fifth embodiment is used before joining the main tunnel 2 and the lamp tunnel 3 and at the initial stage of joining. Specifically, the tunnel joining method of the present embodiment is a main tunnel construction in which a main tunnel 2 having a cutable portion 6 that can be cut by a shield machine is installed at a junction of the main tunnel 2 with the ramp tunnel 3. Process, after installing the circular liner 15 for the communication passage in the main tunnel 2, filling the inner filling material 16 into the main tunnel 2, and the vicinity of the junction of the main tunnel 2 and the lamp tunnel 3 The soil freezing step of freezing the soil of the soil, and the soil frozen portion 51 and the cuttable portion 6 of the main tunnel 2 are cut by a shield machine to dig while the ramp tunnel 3 is being constructed, and the traveling direction into the main tunnel 2 The ramp tunnel approach construction process that enters obliquely, and the segment 7 of the lamp tunnel 3 that faces the main tunnel 2 enters the lamp side permanent segment. 4b is removed, the filling material 16 around the opening is removed, and the uncuttable portion 6 remaining in the main tunnel 2 is removed from the main line side permanent segment 4a. 3 and 4 are connected to the upper and lower cut ends of the main line side permanent segment 4a and the upper and lower cut ends of the lamp side permanent segment 4b, respectively. A connecting joint connecting step of connecting, and a step of standing reinforcing bars 21 between the upper and lower connecting joints 1, 1, and inserting and fixing the iron plate C as a spacer in the gap in the accommodation space 12 in the connecting joint 1. I have.

Here, as the filling material 16, fluidized soil or the like can be used as an example.
The soil freezing process is a process for freezing soil around the junction of the main tunnel 2 and the lamp tunnel 3 to ensure sufficient cutting reaction force that can withstand the cutting force of the shield machine and to prevent water from entering. is there. Further, in the joint joint connecting step, the filling material 16 is removed, and the temporary cuttable portion 6 that remains without being cut is removed from the main line side permanent segment 4a. Then, the segment 7 of the ramp tunnel 3 facing the main tunnel 2 is cut off from the ramp-side permanent segment 4b, and the junction joint 1 of the tunnel according to the present invention is separated from the upper and lower sides of the main-line permanent segment 4a and the reinforcing inner beam 5. The end and the upper and lower cut-off ends of the lamp side permanent segment 4b are connected.

  When joining the joint 1, the support 22 as shown in FIGS. 8 (d) and 8 (e) is installed in the lamp tunnel 3, and the work is performed with the separated end of the lamp-side permanent segment 4 b reinforced. Is good to be done. Then, in the final joining step, the reinforcing support column 21 is erected between the upper and lower joints 1, the steel plate C is inserted into the gaps in the accommodation spaces 12 and 13 in the joint 1, and fixed by bolt fastening. The joining of the main tunnel 2 and the lamp tunnel 3 in the initial stage is completed.

[Example 6]
The tunnel joining method according to the sixth embodiment is used in the middle stage of the merging of the main tunnel 2 and the lamp tunnel 3. Specifically, the tunnel joining method of the present embodiment is performed following the completion of the initial joining of the main tunnel 2 and the ramp tunnel 3 in the fifth embodiment.

  That is, the airfoil in which the airfoil segments 31 common to the respective permanent segments 4a, 4a,... Adjacent to the shield excavator in the digging direction are joined to the upper and lower separated ends of the main line side permanent segment 4a. A segment joining step and upper and lower separated ends of the lamp side permanent segment 3 are configured to form a series of taper shapes with respect to the permanent segments 4b, 4b,... A ramp-side taper segment joining step for joining the individual-size ramp-side taper segments 32, and an adjustment liner loading step for filling the gap by loading the adjustment liner 33 between the airfoil segment 31 and the ramp-side taper segment 32. And.

  In the airfoil segment joining step, the filling material 16 is removed, and the remaining cuttable portion 6 that has not been cut is removed from the main line side permanent segment 4a, and then common to the upper and lower cut ends of the main line side permanent segment 4a. Bonded airfoil segments 31 are joined.

  In the ramp side taper segment joining step, after the segment 7 of the lamp tunnel 3 facing the main tunnel 2 is cut off from the lamp side permanent segment 4b, individual size lamps are formed on the upper and lower cut ends of the lamp side permanent segment 4b. The side taper segments 32 are joined. In the adjustment liner loading process, if the adjustment liner 33 is loaded between the airfoil segment 31 and the ramp-side taper segment 32 to fill the gap, the main tunnel 2 and the lamp tunnel 3 are joined in the middle of the merge. Complete.

[Example 7]
The tunnel joining method according to the seventh embodiment is used at the final stage of the merge of the main tunnel 2 and the ramp tunnel 3. Specifically, the tunnel joining method of the present embodiment is performed following the completion of the joining of the main tunnel 2 and the ramp tunnel 3 in the middle stage in the sixth embodiment.

  That is, the individual size constructed so as to form a series of tapered shapes at the upper and lower cut ends of the main line side permanent segment 4a with respect to the permanent segments 4a, 4a,. The main line side taper segment joining process of the main line side taper segments 41, 41,..., And the permanent segments 4b, 4b adjacent to each other in the shield machine direction at the upper and lower separation ends of the lamp side permanent segment 4b. ,..., A ramp-side taper segment joining step for joining individual-size ramp-side taper segments 42, 42,..., A main line-side taper segment 41 and a lamp-side taper segment 42. And an adjustment liner loading step of filling an adjustment liner 44 to fill the gap.

In the main line side taper segment joining step, the filling material 16 is removed, and the remaining cuttable portion 6 that has not been cut is removed from the main line side permanent segment 4a, and then the upper and lower cut ends of the main line side permanent segment 4a are separated. The main line side taper segment 41 is joined.
Further, in the lamp side taper segment joining step, after the segment 7 is separated from the lamp side permanent segment 4b, the lamp side taper segment 42 is joined to the upper and lower cut ends of the lamp side permanent segment 4b. In the adjustment liner loading process, a wedge-shaped adjustment liner 44 is loaded between the main taper segment 41 and the ramp taper segment 42, the gap is filled, and the main tunnel 2 and the ramp tunnel 3 are joined at the end of the merge. Is completed.

As shown in FIG. 7 and FIG. 11, when the tunnel junction structure 40 is used in common as the main line taper segment 41 and the ramp side taper segment 42, the following is obtained.
Main line side parallel segments 45a, 45b,... For adjustment of individual sizes are provided at the upper and lower cut ends of the main line side permanent segment 4a for each of the permanent segments 4a, 4a,. Are connected to the main taper segments 41, 41,..., And the permanent segments 4b adjacent to each other in the digging direction at the upper and lower cut ends of the lamp-side permanent segments 4b. , 4b,..., A lamp side taper segment joining step for joining the lamp side taper segments 42, 42,... Common through the lamp side parallel segments 46a, 46b,. A wedge-shaped adjustment liner 44 is loaded between the taper segment 41 and the ramp-side taper segment 42 to fill the gap. And a loading step.

[Other embodiments]
The tunnel joint 1, the tunnel joint structure 20, 30, 40 and the tunnel joining method according to the present invention are based on the above-described configuration, but within the scope not departing from the gist of the present invention. It is also possible to change or omit the partial configuration. For example, when the diameter of the main tunnel 2 is small, it is possible to use other materials such as RC that are generally used as the permanent structure segment 4 in place of the ductile or synthetic segment. Further, when sufficient mechanical strength is ensured only by the permanent structure segment 4, the reinforcing inner beam 5 can be omitted.

  The tunnel joint 1 may be configured as shown in FIG. 4 (a) without the reinforcing connecting portion 11, or at the inner corner 10 of the main line side socket 8 and the lamp side socket 9. A configuration may be provided in which a retrofitting type reinforcing bracket 17 as shown in FIG. 4 (b) for connecting the opposing wall surfaces of the main line side socket 8 and the lamp side socket 9 is provided.

  Although illustration is omitted, in the tunnel junction structure 40 according to the third embodiment and the tunnel junction method according to the sixth embodiment, a common one as the ramp-side taper segment 32 is used. It is also possible to cope with a change in the interval caused by the progress of merging by providing an adjustment ramp side parallel segment between the permanent segment on the lamp tunnel 3 side.

  The present invention can be used for tunnel construction in which a ramp tunnel is obliquely entered with respect to a main tunnel and the lamp tunnel is merged with the main tunnel, more specifically, when it is desired to easily cope with various merging angles.

1 is a perspective view showing an outline of a tunnel junction structure and a tunnel junction method according to the present invention. It is an expansion perspective view which shows the junction structure of the tunnel taken in the initial stage of merge. It is a perspective view which shows the structure of the junction joint of the tunnel of this invention. It is a front view which shows the other Example of the junction joint of a tunnel. It is an expansion perspective view which shows the junction structure of the tunnel taken in the middle stage of merging. It is an expansion perspective view which shows the junction structure of the tunnel taken in the stage of the confluence | merging final stage. It is a perspective view which shows the other Example of the junction structure of the tunnel taken in the stage of the confluence | merging final stage. It is explanatory drawing which shows in stepwise the structure of the joining method of the tunnel of this invention taken in the stage before joining and the early stage of joining. A cross-sectional view (a) in the column opening space showing an outline of the junction structure of the tunnel taken in the initial stage of the merge, AA sectional view (b) in the same figure (a), and in the column receiving space It is a cross-sectional view (c). It is a perspective view which shows the structure of a permanent structure segment. It is a principal part expansion perspective view corresponding to the structure of FIG. 7, only the junction part of the upper side of both tunnels is shown in figure, and illustration of the lower side is abbreviate | omitted.

Explanation of symbols

1 (Tunnel) joint, 2 main tunnel, 3 ramp tunnel,
4 permanent structural segments, 5 reinforcing inner beams, 6 temporary cutable segments,
7 Temporary reinforcement segment, 8 main line side socket, 9 lamp side socket, 10 inner corner, 11 reinforcement connection part, 12 accommodation space (main line side socket),
13 accommodating space (for lamp side socket), 14 fastening means, 15 circular liner,
16 Filling material, 17 Reinforcing bracket, 21 Reinforcing strut, 22 Supporting work,
20 (tunnel) junction structure (applied early in merging), 31 airfoil segment,
30 (tunnel) junction structure (applicable to mid-merge), 32 ramp side taper segment,
33 space liner, 34 curved joint, 35 horizontal joint,
40 (tunnel) junction structure (applicable at the end of merging), 41 main line side taper segment,
42 Ramp side taper segment, 44 Taper liner, 45 Main line side horizontal segment, 46 Ramp side horizontal segment, A Ground, C Iron plate

Claims (12)

A junction joint of a tunnel used when a ramp tunnel is entered obliquely with respect to a main tunnel and the main tunnel is joined to the main tunnel,
The junction joint of the tunnel is used in the initial stage of the merge of the main tunnel and the lamp tunnel, and a main socket on the main tunnel side that can accommodate the separated end of the main line permanent segment, and a lamp side permanent segment on the lamp tunnel side. A reinforced joint member having a V-shape in front view provided with a lamp-side socket capable of accommodating a cut-off end portion thereof, and the accommodation space for the main line-side socket and the lamp-side socket is set to be large in advance. And tunnel joints.   2. The main line side socket and the lamp side socket that are expanded in a V shape when viewed from the front are provided with reinforcing connection portions integral with the main line side socket and the lamp side socket that fill the inner corner. A junction joint of a tunnel characterized by   In Claim 1, the reinforcement bracket which connects the wall surface which the main line side socket and the lamp side socket oppose is provided in the inner corner part of the main line side socket and the lamp side socket which were expanded in the V shape in the front view. This is a tunnel joint. A junction structure of a tunnel used when a ramp tunnel is obliquely entered with respect to a main tunnel and the lamp tunnel merges with the main tunnel,
The junction structure of the tunnel is used in the initial stage of merging of the main tunnel and the lamp tunnel, and the upper and lower cut ends of the main line permanent segment on the main tunnel side and the upper and lower cut ends of the lamp side permanent segment on the lamp tunnel side. A tunnel joint structure comprising: the tunnel joint joint according to any one of claims 1 to 3; and a reinforcing column provided between the upper and lower tunnel joint joints. . A junction structure of a tunnel used when a ramp tunnel is obliquely entered with respect to a main tunnel and the lamp tunnel merges with the main tunnel,
The junction structure of the tunnel is used in the middle stage of the merge of the main tunnel and the ramp tunnel, and a common airfoil segment joined to the upper and lower separated ends of the main line-side permanent segment on the main tunnel side, and the ramp tunnel A tunnel having a ramp-side taper segment joined to upper and lower cut-off ends of a lamp-side permanent segment, and an adjustment liner that fills a gap between the airfoil segment and the ramp-side taper segment. Junction structure.   6. The airfoil segment according to claim 5, wherein the airfoil segment is located on the main tunnel side, is formed with a curved joint formed by the same curvature as that of the main tunnel, and is located on the lamp tunnel side toward the cut-off end portion of the lamp-side permanent segment. A tunnel junction structure comprising: a horizontal junction provided so as to project horizontally. A junction structure of a tunnel used when a ramp tunnel is obliquely entered with respect to a main tunnel and the lamp tunnel merges with the main tunnel,
The junction structure of the tunnel is used at the final stage of merging of the main tunnel and the lamp tunnel, and is connected to the upper and lower cut-off ends of the main line permanent segment on the main tunnel side, and the ramp on the lamp tunnel side. A tunnel junction comprising: a ramp-side taper segment joined to upper and lower cut-off ends of a side permanent segment; and an adjustment liner that fills a gap between the main-line taper segment and the ramp-side taper segment. Construction.   In Claim 7, the main line side taper segment and the ramp side taper segment are made common, and the main line side parallel segment for adjustment, the lamp side permanent segment and the lamp are arranged between the main line side permanent segment and the main line side taper segment. A tunnel junction structure in which a ramp side parallel segment for adjustment is provided between each side taper segment. A method of joining the tunnel used before and at the initial stage of the joining of the main tunnel and the lamp tunnel in the case where the lamp tunnel is obliquely entered with respect to the main tunnel and the lamp tunnel is joined to the main tunnel,
A main tunnel construction process for constructing a main tunnel with a cutable portion that can be cut by a shield machine at the junction of the main tunnel with the ramp tunnel,
After installing the circular liner for the communication passage in the main line tunnel, filling the filling material in the main line tunnel,
A soil freezing step of freezing soil around the junction of the main tunnel and the lamp tunnel;
A ramp tunnel approach construction process in which the soil freezing portion and the cuttable portion of the main tunnel are cut by the shield machine and excavated while constructing the ramp tunnel and entering the main tunnel obliquely in the traveling direction,
The part of the lamp tunnel that has entered the main tunnel facing the main tunnel is removed from the lamp-side permanent segment and opened, the filling material around the opening is removed, and the remaining cutting without cutting the main tunnel is possible. Side communication process of removing the part from the main line side permanent segment and communicating both tunnels on the side surface,
A joint joint connection step for connecting the joint joint of the tunnel according to any one of claims 1 to 3 to the upper and lower cut-off ends of the main line-side permanent segment and the upper and lower cut-off ends of the lamp-side permanent segment, respectively.
A tunnel joining method, comprising: a joining step in which a reinforcing column is erected between upper and lower connection joints, and a spacer is inserted and fixed in a gap in an accommodation space in the joint joint. A tunnel joining method used in the middle stage of the merge of the main tunnel and the ramp tunnel when the ramp tunnel is obliquely entered with respect to the main tunnel and the ramp tunnel merges with the main tunnel,
A main tunnel construction process for constructing a main tunnel with a cutable portion that can be cut by a shield machine at the junction of the main tunnel with the ramp tunnel,
After installing the circular liner for the communication passage in the main line tunnel, filling the filling material in the main line tunnel,
A soil freezing step of freezing soil around the junction of the main tunnel and the lamp tunnel;
A ramp tunnel approach construction process in which the soil freezing portion and the cuttable portion of the main tunnel are cut by the shield machine and excavated while constructing the ramp tunnel and entering the main tunnel obliquely in the traveling direction,
The part of the lamp tunnel that has entered the main tunnel facing the main tunnel is removed from the lamp-side permanent segment and opened, the filling material around the opening is removed, and the remaining cutting without cutting the main tunnel is possible. Side communication process of removing the part from the main line side permanent segment and communicating both tunnels on the side surface,
An airfoil segment joining step for joining airfoil segments common to the respective permanent segments adjacent to each other in the excavation direction at upper and lower separation ends of the main line side permanent segment;
A lamp-side taper that joins individual lamp-side taper segments configured to form a series of taper shapes to the respective permanent segments adjacent to each other in the digging direction at upper and lower cut-off ends of the lamp-side permanent segment. Segment joining process,
An adjustment liner loading process for filling the gap by loading an adjustment liner between the airfoil segment and the ramp-side taper segment;
A method for joining tunnels, comprising: A tunnel joining method used in the final stage of the merge of the main tunnel and the ramp tunnel when the ramp tunnel is obliquely entered with respect to the main tunnel and the ramp tunnel merges with the main tunnel,
A main tunnel construction process for constructing a main tunnel with a cutable portion that can be cut by a shield machine at the junction of the main tunnel with the ramp tunnel,
After installing the circular liner for the communication passage in the main line tunnel, filling the filling material in the main line tunnel,
A soil freezing step of freezing soil around the junction of the main tunnel and the lamp tunnel;
A ramp tunnel approach construction process in which the soil freezing portion and the cuttable portion of the main tunnel are cut by the shield machine and excavated while constructing the ramp tunnel and entering the main tunnel obliquely in the traveling direction,
The part of the lamp tunnel that has entered the main tunnel facing the main tunnel is removed from the lamp-side permanent segment and opened, the filling material around the opening is removed, and the remaining cutting without cutting the main tunnel is possible. Side communication process of removing the part from the main line side permanent segment and communicating both tunnels on the side surface,
Main line side taper joining individual size main line side taper segments configured to form a series of taper shapes to each of the permanent segments adjacent to each other in the digging direction at the upper and lower separation ends of the main line side permanent segment. Segment joining process,
A lamp-side taper that joins individual lamp-side taper segments configured to form a series of taper shapes to the respective permanent segments adjacent to each other in the digging direction at upper and lower cut-off ends of the lamp-side permanent segment. Segment joining process,
An adjustment liner loading step of filling an adjustment liner between the main line side taper segment and the ramp side taper segment to fill the gap;
A method for joining tunnels, comprising: A tunnel joining method used in the final stage of the merge of the main tunnel and the ramp tunnel when the ramp tunnel is obliquely entered into the main tunnel and the ramp tunnel merges with the main tunnel,
A main tunnel construction process for constructing a main tunnel with a cutable portion that can be cut by a shield machine at the junction of the main tunnel with the ramp tunnel,
After installing the circular liner for the communication passage in the main line tunnel, filling the filling material in the main line tunnel,
A soil freezing step of freezing soil around the junction of the main tunnel and the lamp tunnel;
A ramp tunnel approach construction process in which the soil freezing portion and the cuttable portion of the main tunnel are cut by the shield machine and excavated while constructing the ramp tunnel and entering the main tunnel obliquely in the traveling direction,
The part of the lamp tunnel that has entered the main tunnel facing the main tunnel is removed from the lamp-side permanent segment and opened, the filling material around the opening is removed, and the remaining cutting without cutting the main tunnel is possible. Side communication process of removing the part from the main line side permanent segment and communicating both tunnels on the side surface,
Main line joining main line side taper segment shared by main line side parallel segments for adjustment of individual sizes for each of the permanent segments adjacent to each other in the digging direction at upper and lower cut ends of the main line side permanent segment. Side taper segment joining process;
The lamp which joins the lamp side taper segment which is made common via the lamp side parallel segment for adjustment of individual size for each of the above-mentioned permanent segments adjacent to the direction of excavation to the upper and lower cut ends of the lamp side permanent segment Side taper segment joining process;
An adjustment liner loading step of filling an adjustment liner between the main line side taper segment and the ramp side taper segment to fill the gap;
A method for joining tunnels, comprising:

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