JP2007197923A - Divergent/confluent section structure, and construction method for divergent/confluent section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a divergent/confluent section structure capable of securing the sufficient strength of space of a divergent/confluent section. <P>SOLUTION: The divergent/confluent section structure comprises an upper anchor tunnel 13 which is arranged in a lateral position opposite to a main-line tunnel 11a of a ramp tunnel 12a in such a manner as to be positioned above the ramp tunnel 12a, and a lower anchor tunnel 15 which is arranged in such a manner as to be positioned below the ramp tunnel 12a and almost vertically below the upper anchor tunnel 13. The divergent/confluent section structure is also equipped with a timbering wall 17 for connecting the anchor tunnels 13 and 15 to each other. The timbering wall 17 and the upper section of a ramp tunnel 12a side skeleton of the main-line tunnel 11a are connected to each other by means of an upper floor beam 21a continuing in an almost horizontal direction. The timbering wall 17 and a lower section of the ramp tunnel 12a side skeleton of the main-line tunnel 11a are connected to each other by means of a lower floor beam 23a continuing in the almost horizontal direction. The divergent/confluent section space 20a which makes the main-line tunnel 11a and the ramp tunnel 12a communicate with each other is formed between the upper and lower floor beams 21a and 23a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of a merging / merging portion in which a main tunnel and a lamp tunnel are connected, and a merging / merging portion having a merging / merging portion space in which a part of the lamp tunnel is disposed adjacent to and communicates with the main tunnel. The present invention relates to a structure and a method for constructing a junction / merging section for constructing this branch / merging section space in the ground.

  In a junction where a main tunnel such as a road tunnel or a subway tunnel is connected to a ramp tunnel such as an access tunnel that communicates with the ground or a communication tunnel that communicates with other tunnels, part of the ramp tunnel is part of the main tunnel. A merging / merging portion structure is constructed in which a merging / merging portion space having a wide lateral width is formed so as to be adjacent to each other and communicated therebetween.

  Conventionally, in such a merging / merging portion structure, an open-cut method in which an opening is provided in the ground portion corresponding to a portion corresponding to the merging / merging portion space and excavating from the opening to construct the merging / merging portion structure has been mainstream.

  However, in the open-cut method, it is necessary to provide an opening over a wide area during construction, and it is difficult to acquire land, so a method for building a split junction without using such open-cut method is also proposed. Has been.

For example, in Patent Document 1 below, a part of the side wall of an existing shield tunnel is formed by arranging a plurality of extruded segment portions made of at least one extruded segment that can be extruded in the radial direction of the tunnel in the axial direction. For each segment part, a cylindrical part protruding in the direction opposite to the extrusion direction is joined to the peripheral part on the inner wall side of the extruded segment part to form a box-shaped block body, and the block body is installed in the radial direction in the existing shield tunnel These are extruded from the side walls of each of them, are connected in the axial direction, and the partition wall portion that partitions the block bodies is removed to provide a pillar to widen the shield tunnel.
JP 2004-27711 A

  However, in such a conventional one, since the merging / merging part is constructed by the shield method, it is not necessary to provide an opening in a wide area during construction, but the merging / merging part space is composed of a main tunnel and a ramp. Since a part of the tunnel is adjacently arranged horizontally and communicates with each other, the lateral width is likely to be much wider than other parts of the main tunnel and the lamp tunnel. Therefore, in order to ensure sufficient strength in the full width, it is necessary to reinforce the entire merging and merging section structure after excavation, for example, by making the frame very thick or arranging a number of columns vertically and horizontally. For example, it took time to build.

  Then, this invention makes it a subject to provide the junction part structure which can ensure sufficient intensity | strength of a part junction part space in view of said point.

  It is another object of the present invention to provide a method for constructing a junction / merging section that can construct such a junction / merging section structure more safely while suppressing the opening on the ground.

  The merging and merging portion structure according to claim 1, which solves the above-described problem, is a merging and merging portion structure in which a main tunnel and a part of a ramp tunnel arranged at the merging / merging portion beside the main tunnel are communicated. An upper anchor tunnel disposed above the ramp tunnel at a side position opposite to the main tunnel of the ramp tunnel; and a substantially vertical lower side of the upper anchor tunnel below the ramp tunnel. A lower anchor tunnel disposed so as to have a supporting wall connecting the upper anchor tunnel and the lower anchor tunnel, and the upper part of the main body tunnel on the ramp tunnel side and the supporting wall, Connected by an upper floor girder that is continuous in a substantially horizontal direction, and the lower part of the main body tunnel on the lamp tunnel side and the supporting wall However, it is connected by a lower floor girder that is continuous in a substantially horizontal direction, and a merging / merging space that connects the main tunnel and the lamp tunnel is formed between the upper floor girder and the lower floor girder. And

  The merging and merging portion structure according to claim 2 includes a pair of main line tunnels, and a part of the ramp tunnel of one main line tunnel is disposed adjacent to the pair of main line tunnels at the merging and merging portion. A part of the lamp tunnel of the other main tunnel is disposed adjacent to the pair of main tunnels, and each main tunnel and a part of the lamp tunnel communicate with each other. An upper anchor tunnel disposed above the pair of ramp tunnels at a position corresponding to between the ramp tunnels, and below the pair of ramp tunnels and substantially vertically below the upper anchor tunnel. A lower anchor tunnel, and a supporting wall connecting the upper anchor tunnel and the lower anchor tunnel. The upper part of the main body tunnel on the lamp tunnel side of the main line tunnel and the support wall are connected to each other by upper floor girders that are continuous in a substantially horizontal direction, and the lower part of the main line tunnel on the side of the lamp tunnel and the support wall. Are connected by lower floor girders that are continuous in a substantially horizontal direction, and each main tunnel and the lamp tunnel communicate with each other between the upper floor girders and the lower floor girders on both sides of the support wall. Are formed respectively.

  In addition to the configuration according to claim 1, the branching / merging portion structure according to claim 3 includes an upper reinforcing member that connects the upper anchor tunnel and the upper floor girder, the lower anchor tunnel, and the lower floor girder. And a lower reinforcing member for connecting the two.

  In addition to the structure according to any one of claims 1 to 3, the branching and merging portion structure according to claim 4 includes an upper floor girder extension continuous with the upper floor girder in the main tunnel. A lower floor girder and a continuous lower floor girder extension are provided.

  The method of constructing a junction / merging portion according to claim 5 is a construction method of a junction / merging portion in which a part of the lamp tunnel is arranged adjacent to and communicated with the existing main line tunnel next to the main tunnel. An upper anchor tunnel is constructed at a position on the side opposite to the main tunnel so as to be above the ramp tunnel, and below the ramp tunnel and substantially vertically below the upper anchor tunnel. A lower anchor tunnel is constructed, and a supporting wall is constructed by excavating the upper anchor tunnel and the lower anchor tunnel at the merging portion to connect the two, and the upper portion of the main tunnel on the ramp tunnel side and the upper An upper floor girder is constructed by excavating between the support walls in a substantially horizontal direction and connecting the main tunnel body and the support wall. The lower floor girder is constructed by digging in a substantially horizontal direction between the lower part of the tunnel on the tunnel side and the support wall, and connecting the main tunnel case and the support wall. In the meantime, the main tunnel is opened and excavated to form a merging / merging space that connects the main tunnel and the ramp tunnel.

  According to the method for constructing the merging and merging section according to claim 6, a part of the lamp tunnel of one main tunnel is adjacently disposed between the existing pair of main tunnels at the merging and merging section, and the lamp tunnel of the other main tunnel is arranged. In a method of constructing a branching and merging section in which a part is arranged adjacent to each other and each main tunnel and a part of the lamp tunnel communicate with each other, the pair of lamp tunnels are positioned at positions corresponding to the pair of lamp tunnels. An upper anchor tunnel is constructed to be above, and a lower anchor tunnel is constructed to be below the pair of ramp tunnels and substantially vertically below the upper anchor tunnel, and the upper anchor tunnel and the lower anchor tunnel A support wall that connects to the ramp wall on both sides of the support wall on the ramp tunnel side of each main tunnel And an upper floor girder that connects the frame of each main line tunnel and the support wall by excavating between the support wall and the support wall, and on the ramp tunnel side of each main tunnel on both sides of the support wall. A lower floor girder is constructed by digging in a substantially horizontal direction between the lower part of the frame and the support wall to connect the frame of each main tunnel and the support wall, and the upper floor girder and the lower side on both sides of the support wall. Each of the main girder tunnels is opened and excavated with a floor girder to form merging and merging space that communicates the main tunnel and the ramp tunnel.

  According to a seventh aspect of the present invention, there is provided a method for constructing a branching / merging portion, in addition to the configuration according to the fifth or sixth aspect, excavating the upper anchor tunnel and the lower anchor tunnel from the ground side in parallel with the ramp tunnel. It is characterized by building.

  In addition to the structure according to claim 7, the construction method of the branching junction according to claim 8 includes excavating the ramp tunnel, the upper anchor tunnel, and the lower anchor tunnel from a common shaft on the ground side. It is characterized by building.

  In addition to the structure according to claim 5 to 8, the construction method of the branching / merging portion according to claim 9 includes the upper anchor tunnel and the excavator before excavating between the upper floor girder and the lower floor girder. An upper reinforcing member for connecting the upper floor girder and a lower reinforcing member for connecting the lower anchor tunnel and the lower floor girder are constructed.

  According to the merging and merging portion structure according to claim 1, the upper floor girder and the lower floor girder are connected to both sides of the support wall arranged at the side position opposite to the main tunnel of the ramp tunnel. Since the girders are connected to the main tunnel frame, an integrated frame can be constructed as a whole, and the load applied to the upper and lower floor girders by the earth and soil pressure of the natural ground is supported as a component force. Can be supported by a wall. In addition, since the supporting walls are connected to the upper anchor tunnel and the lower anchor tunnel arranged so as to be above and below the pair of ramp tunnels, sufficient holding performance against the load applied to the supporting walls is provided. Can be secured. For this reason, the main tunnel and the lamp tunnel communicate with each other to increase the lateral width, so that it is possible to secure each merging portion space, which is difficult to secure the strength, with sufficient strength.

  According to the merging and merging portion structure according to claim 2, the upper floor girder and the lower floor girder are respectively connected to both sides of the support wall arranged at a position corresponding to between the pair of lamp tunnels. Are connected to the main tunnels so that an integrated unit can be constructed as a whole, and the load applied to the upper and lower floor girders by the earth and soil pressure of the natural ground is supported as a component force. Can be supported by a wall. In addition, the supporting wall is connected to the upper anchor tunnel disposed above the pair of ramp tunnels and the lower anchor tunnel disposed below the pair of ramp tunnels at a position corresponding to the pair of ramp tunnels. Sufficient holding performance can be ensured with respect to the applied load. For this reason, the main tunnel and the lamp tunnel communicate with each other to increase the lateral width, so that it is possible to secure each merging portion space, which is difficult to secure the strength, with sufficient strength.

  Moreover, with respect to the supporting wall in which sufficient holding performance of the load is secured by the upper anchor tunnel disposed above the pair of ramp tunnels and the lower anchor tunnel disposed below, the upper floor girder and the lower wall are respectively provided on both sides thereof. Since the floor girder is provided, it is possible to satisfactorily ensure the balance of both sides in the width direction of the merging / merging portion with the support wall 17 as the center, and a stable merging / merging portion structure can be configured.

  According to the merging and merging portion structure according to claim 3, since the upper reinforcing member for connecting the upper anchor tunnel and the upper floor girder and the lower reinforcing member for connecting the lower anchor tunnel and the lower floor girder are provided, The load applied to the girders and lower floor girders in the vertical direction by soil water pressure can be more reliably distributed as a component force to the support wall via the upper and lower reinforcing members, ensuring the strength of the merging space. Easy to do.

  According to the merging and merging structure according to claim 4, the main tunnel is provided with the upper floor girder extension portion continuous with the upper floor girder and the lower floor girder extension portion continuous with the lower floor girder. It is also possible to reinforce the housing of the main body integrally, and it is easy to sufficiently secure the strength of the junction part of the main tunnel.

  According to the construction method of claim 5, the upper anchor tunnel and the lower anchor tunnel are constructed above and below the ramp tunnel, and a supporting wall is constructed by excavating between them at the junction and connecting the two. Then, an upper floor girder and a lower floor girder that connect the main tunnel and the supporting wall are constructed by excavating between the main tunnel and the supporting wall in a substantially horizontal direction, and between the upper floor girder and the lower floor girder. Since the main tunnel is opened and excavated to form the merging / merging portion space, the merging / merging portion space can be formed without forming an opening corresponding to the merging / merging portion space on the ground. At the same time, in the state where it is reinforced with sufficient strength by the upper floor girder and the lower floor girder that connect the main tunnel and the supporting wall, excavation between them forms a merging section space. Can be built.

  According to the construction method according to claim 6, the upper anchor tunnel and the lower anchor tunnel are constructed above and below the pair of ramp tunnels at the junction between the existing pair of main tunnels, and the pair of ramp tunnels. Drilling through them, constructing a supporting wall that connects the two, and excavating between each main tunnel and the supporting wall in a substantially horizontal direction, and connecting the main tunnel girder to the supporting wall Each lower floor girder is constructed, and the main tunnel tunnel is opened between each upper floor girder and lower floor girder to excavate to form a division merging space. It is possible to form the merging / merging portion space without forming the opening portion. At the same time, in the state where it is reinforced with sufficient strength by the upper floor girder and the lower floor girder that connect the main tunnel and the supporting wall, excavation between them forms a merging section space. Can be built.

  In addition, since the upper floor girder and the lower floor girder are provided on both sides of the supporting wall that can secure sufficient strength by the upper anchor tunnel and the lower anchor tunnel respectively arranged above and below the pair of ramp tunnels, In order to form the subspace, a pair of upper and lower anchor tunnels and supporting walls may be constructed, and it is possible to construct the merging and joining subspace efficiently.

  According to the method of claim 7, since the upper anchor tunnel and the lower anchor tunnel are constructed by excavating from the ground side in parallel with the ramp tunnel, the excavation position on the ground side can be brought close to each other. During the construction, the opening formed on the ground side can be concentrated to reduce the range.

  According to the method of claim 8, since the ramp tunnel, the upper anchor tunnel, and the lower anchor tunnel are constructed by excavating from a common shaft on the ground side, they are formed on the ground side during construction of each tunnel. An opening part can be made into the opening of a shaft, and the range of the opening part on the ground side can be restrained less.

  According to the method of claim 9, before excavating between the upper floor girder and the lower floor girder, an upper reinforcing member that connects the upper anchor tunnel and the upper floor girder, a lower anchor tunnel and the lower floor girder Therefore, the upper floor girder and the lower floor girder can be reinforced and excavated between them, and the merging / merging space can be constructed more safely.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 of the Invention

1 to 7 show a first embodiment of the present invention.
As shown in FIGS. 1 and 2, main tunnels 11a and 11b made up of a pair of three-lane road tunnels are disposed in the ground, and a pair of two lanes from the ground G is placed between the pair of main tunnels 11a and 11b. The lamp tunnels 12a and 12b extend. Here, the pair of lamp tunnels 12a and 12b are constructed in parallel to the main tunnels 11a and 11b, respectively. In the merging / merging portion 10, one lamp tunnel 12a is connected to one main tunnel 11a, and the other lamp tunnel 12b is connected to the other main tunnel 11b.

  The junction / merging portion structure of the junction / merging portion 10 is arranged so that a part of the lamp tunnel 12a is adjacent to the main tunnel 11a and the other main tunnel 11b is connected to the lamp tunnel 12b. The main tunnels 11a and 11b are arranged so as to be partially adjacent to each other, and are constructed such that the main tunnels 11a and 11b communicate with the adjacent lamp tunnels 12a and 12b.

  In this branching junction structure, as shown in FIG. 3, the upper anchor tunnel 13 and the upper anchor tunnel 13 arranged at a position between the pair of ramp tunnels 12a and 12b in the cross section orthogonal to the alignment direction of the main tunnels 11a and 11b. A lower anchor tunnel 15 and a supporting wall 17 connecting them are provided, and the supporting wall 17 and the main line tunnels 11a and 11b are connected by upper floor girders 21a and 21b and lower floor girders 23a and 23b, respectively. ing.

  In addition, the junction space spaces 20a and 20b connecting the main tunnels 11a and 11b and the lamp tunnels 12a and 12b between the upper floor girders 21a and 21b and the lower floor girders 23a and 23b on both sides of the support wall 17 are respectively provided. Is formed. Here, the main tunnels 11a and 11b are constructed over the entire length of the branching section 10, but the ramp tunnels 12a and 12b are built from the ground G side to the branching section 10. .

  The upper anchor tunnel 13 is arranged in parallel along the ramp tunnels 12a and 12b so as to be above the ramp tunnels 12a and 12b at a position corresponding to the ramp tunnels 12a and 12b. In other words, the upper anchor tunnel 13 is above a side position opposite to the main tunnel 11a of one ramp tunnel 12a and above a side position opposite to the main tunnel 11b of the other ramp tunnel 12b. Is arranged.

  The lower anchor tunnel 15 is constructed in parallel along the upper anchor tunnel 13 so as to be substantially vertically below the upper anchor tunnel 13 at a position above both the ramp tunnels 12a and 12b.

  The casings of the upper anchor tunnel 13 and the lower anchor tunnel 15 have, for example, a configuration in which a large number of arc-shaped concrete segments are connected in the circumferential direction and the orientation direction of the upper and lower anchor tunnels 13 and 15.

  The support wall 17 is constructed so as to penetrate between the pair of ramp tunnels 12 a and 12 b and connects the upper anchor tunnel 13 and the lower anchor tunnel 15. The support wall 17 is, for example, a large number of square-tube shaped steel shells 17c stacked one above the other and arranged and fixed in the orientation direction of the upper and lower anchor tunnels 13 and 15, and the inside thereof is filled with concrete K. It has a configuration.

  Further, the upper end 17 a side is fixed by concrete K placed in the upper anchor tunnel 13 in a state of projecting inward from the lower opening 13 a at the lower part of the upper anchor tunnel 13. Further, the lower end portion 17 b side is fixed by concrete K placed in the lower anchor tunnel 15 in a state of protruding from the upper opening 15 a at the upper part of the lower anchor tunnel 15 to the inside.

  As a result, the upper anchor tunnel 13, the lower anchor tunnel 15, and the support wall 17 are continuously integrated over the entire length of the branching junction 10.

  The upper floor girders 21a and 21b are constructed in a substantially horizontal direction between the upper part of the main body tunnels 11a and 11b on the lamp tunnels 12a and 12b side and the support wall 17, and It is firmly connected to the upper part of the housing and the side surface of the support wall 17. The upper floor girders 21a and 21b include, for example, a large number of square tube-shaped steel shells 21c arranged and fixed with the through-shafts extending in the lateral width direction between the main tunnels 11a and 11b and the supporting wall 17 and upper and lower anchors. The tunnels 13 and 15 are arranged and fixed side by side in the alignment direction, and the inside thereof is filled with concrete K.

  Moreover, the main tunnel 11a, 11b side edge part of the upper floor girders 21a, 21b is the main tunnel 11a in wide opening part 11c, 11d provided over the full length of the junction part 10 in the frame side part of the main line tunnel 11a, 11b. , 11b is coupled to the upper part of the housing. On the other hand, the ends of the upper floor girders 21 a and 21 b on the support wall 17 side are coupled to the steel shell 17 c of the support wall 17.

  Similarly to the upper floor girders 21a and 21b, the lower floor girders 23a and 23b are also constructed in a substantially horizontal direction between the lower part of the main body tunnel 11a and 11b on the side of the ramp tunnels 12a and 12b and the support wall 17. In addition, the main body tunnels 11a and 11b are firmly connected to the lower part of the frame and the side surface of the supporting wall 17. The lower floor walls 23a and 23b are, for example, arranged and fixed in a large number with a plurality of square tube-shaped steel shells 23c facing the through shaft in the lateral width direction of the main tunnels 11a and 11b and the support wall 17 The anchor tunnels 13 and 15 are arranged and fixed side by side in the orientation direction, and the inside thereof is filled with concrete K.

  Moreover, the main tunnel 11a, 11b side edge part of the lower floor girder 23a, 23b is a main line tunnel in the wide opening part 11c, 11d provided in the frame side part of the main line tunnel 11a, 11b over the full length of the junction part 10. 11a and 11b are coupled to the lower part of the housing. On the other hand, the ends of the lower floor girders 23 a and 23 b on the support wall 17 side are coupled to the steel shell 17 c of the support wall 17.

  In this split junction structure, the upper reinforcing members 25a and 25b that obliquely connect the upper anchor tunnel 13 and the upper floor girders 21a and 21b, and the lower anchor tunnel 15 and the lower floor girders 23a and 23b are further inclined. And lower reinforcing members 27a and 27b connected to each other.

  The upper reinforcing members 25a and 25b and the lower reinforcing members 27a and 27b are provided over the entire length of the branching junction 10 for the purpose of supporting the upper floor girders 21a and 21b and the lower floor girders 23a and 23b. As shown in FIG. 2, a large number of pipe reinforcement members 29 oriented in the width direction between the upper and lower anchor tunnels 13 and 15 and the main tunnels 11a and 11b are arranged side by side in the longitudinal direction of the main tunnels 11a and 11b. is doing.

  As shown in FIGS. 4 and 5, each pipe reinforcing member 29 includes a steel pipe 31 a, a steel bar, a reinforcing bar, and a steel bar that are disposed in the steel pipe 31 a and have both ends protruding from the ends of the steel pipe 31 a. And the like, and a concrete K filled in a space between the steel pipe 31a and the support bar 31b. Each pipe reinforcing member 29 having such a structure is individually connected at one end to the upper and lower anchor tunnels 13 and 15 and at the other end to the upper floor girders 21a and 21b or the lower floor girders 23a and 23b. Has been.

  As shown in FIG. 4, the connecting structure of the upper reinforcing members 25a and 25b and the upper anchor tunnel 13 is such that a connecting member 33a fixed to the upper end portion 17a of the supporting wall 17 is embedded in the concrete K, and the upper anchor tunnel. One end of the pipe reinforcing member 29 is inserted into the inclined opening 13b formed in 13, and the pipe reinforcing member is attached to the fixed base 33b provided at a position facing both the inclined opening 13b in the coupling member 33a. The support rod 31b protruding from the 29 steel pipes 31a is fixed by, for example, a nut 33c.

  Further, as shown in FIG. 5, the connecting structure of the upper reinforcing members 25a, 25b and the upper floor girders 21a, 21b is arranged at the positions of the upper floor girders 21a, 21b on the main tunnels 11a, 11b side. The fixed base 35a is fixed in a state of being embedded in the steel shell 21c constituting the structure, and the support bar 31b protruding from the steel pipe 31a of the pipe reinforcing member 29 is fixed to the fixed base 35a with, for example, a nut 35b or the like. It has become.

  On the other hand, as shown in FIG. 6, the connecting structure of the lower reinforcing members 27a and 27b and the lower anchor tunnel 15 is such that the connecting member 37a fixed to the lower end portion 17b of the supporting wall 17 is embedded in the concrete K. A position where one end of the pipe reinforcing member 29 is inserted into the inclined opening 15b obliquely opened on the both main tunnels 11a, 11b side of the anchor tunnel 15 and faces both the inclined openings 15b in the coupling member 37a. The support bar 31b protruding from the steel pipe 31a of the pipe reinforcing member 29 is fixed to the fixed base 37b provided on the base plate 37b by, for example, a nut 37c.

  Further, as shown in FIG. 7, the connecting structure of the lower reinforcing members 27a and 27b and the lower floor girders 23a and 23b is arranged at the positions of the lower floor girders 23a and 23b on the main line tunnels 11a and 11b side. The fixed base 39a is fixed in a state of being embedded in the steel shell 23c constituting the parts 23a and 23b, and a support bar 31b protruding from the steel pipe 31a of the pipe reinforcing member 29 is fixed to the fixed base 39a with a nut 39b, for example. It has a structure.

  By connecting the respective parts as described above, in the structure of the merging and merging part 10, the upper and lower anchor tunnels 13 and 15, the support wall 17, the upper floor girders 21a and 21b, and the lower floor girders 23a and 23b are connected together. It has become a strong structure.

  In this strong structure, the lamp tunnels 12a and 12b communicate with the main tunnels 11a and 11b between the upper floor girders 21a and 21b and the lower floor girders 23a and 23b. Dividing / merging portion spaces 20a and 20b are respectively formed.

  In addition, as shown in FIG. 3 and the like, the main tunnels 11a and 11b are formed with evacuation paths 41a and 41b, and inverts 43a and 43b are constructed.

  According to the merging and merging portion structure of the first embodiment as described above, the upper floor girders 21a and 21b and the lower floor are provided on both sides of the support wall 17 disposed at a position corresponding to the position between the pair of lamp tunnels 12a and 12b. Since the girders 23a and 23b are connected to each other, and the upper floor girders 21a and 21b and the lower floor girders 23a and 23b are connected to the frame of each main tunnel 11a and 11b, the support wall 17, the upper floor girders 21a and 21b, and the lower floor girders are connected. A housing in which 23a and 23b are integrated as a whole can be configured. Therefore, the load applied to the upper floor girders 21a and 21b and the lower floor girders 23a and 23b by the soil water pressure of the natural ground can be supported by the support wall 17 as a component force.

  Further, a support wall 17 penetrating between the pair of lamp tunnels 12a and 12b is disposed above the pair of lamp tunnels 12a and 12b and an upper anchor tunnel 13 disposed below the pair of lamp tunnels 12a and 12b. Since it is connected to the anchor tunnel 15, it is possible to ensure sufficient holding performance against the load applied to the support wall 17.

  Therefore, even if the merging and merging portion 10 has a wider width due to the communication between the main tunnels 11a and 11b and the lamp tunnels 12a and 12b, it is possible to secure the merging / merging portion spaces 20a and 20b with sufficient strength. It is.

  Moreover, with respect to the supporting wall 17 in which sufficient holding performance of the load is secured by the upper anchor tunnel 13 disposed above the pair of ramp tunnels 12a and 12b and the lower anchor tunnel 15 disposed below, Since the upper floor girders 21a and 21b and the lower floor girders 23a and 23b are respectively provided on both sides, it is possible to ensure a good balance on both sides in the width direction of the dividing / merging portion 10 with the support wall 17 as the center, and a stable dividing / merging portion. A structure can be constructed.

  In particular, in the first embodiment, the upper reinforcing members 25a and 25b that obliquely connect the upper anchor tunnel 13 and the upper floor girders 21a and 21b, and the lower anchor tunnel 15 and the lower floor girders 23a and 23b are obliquely connected. Since the lower reinforcing members 27a and 27b are provided, the loads applied to the upper floor girders 21a and 21b and the lower floor girders 23a and 23b in the vertical direction by earth water pressure are applied to the upper reinforcing members 25a and 25b and the lower reinforcing members 27a, 27b can be more reliably distributed as a component force to the support wall 17 via 27b, and it is easier to secure the strength of the split junction space 20a, 20b.

  Next, the construction method of the branching / merging portion structure of the first embodiment as described above will be described.

  In this construction method, the ramp tunnels 12a and 12b from the ground for the respective main tunnels 11a and 11b are respectively constructed in a state where the pair of main tunnels 11a and 11b are already arranged. A part of the lamp tunnel 12a is disposed adjacent to one main tunnel 11a at a position between the main tunnels 11a and 11b, and a part of the lamp tunnel 12b of the other main tunnel 11b is disposed adjacent to the main tunnel 11a. In this part, the main tunnels 11a and 11b and the lamp tunnels 12a and 12b are connected to each other by communicating with each other.

  First, as shown in FIG. 1 and FIG. 2, the ramp tunnels 12a and 12b and the upper anchor tunnel 13 are located at positions closer to the junction 10 than the openings 12c and 12d on the ground G of the ramp tunnels 12a and 12b to be constructed. And the start shaft 45 for starting excavation with the lower anchor tunnel 15 is constructed | assembled.

  The start shaft 45 is used in common for the ramp tunnels 12a and 12b, the upper anchor tunnel 13 and the lower anchor tunnel 15, and is constructed at a predetermined depth and then starts excavating each tunnel. In general, the tunnels are started from the lower tunnel in consideration of the mutual tunnel construction, and the lower anchor tunnel 15, the ramp tunnels 12 a and 12 b, and the upper anchor tunnel 13 are ordered. It is preferable to start excavation.

  Here, the upper anchor tunnel 13 and the lower anchor tunnel 15 are excavated in parallel with the ramp tunnels 12a and 12b.

  In addition, the section from the starting shaft 45 to the ground part can be provided by excavating by a general open-cut method or the like separately from or after the construction of the subsequent junction 10. At this time, the ramp tunnels 12a and 12b are necessarily provided, but the upper anchor tunnel 13 and the lower anchor tunnel 15 are not necessarily provided unless used later.

  If this start shaft 45 is constructed deeply, it is possible to make the upper anchor tunnel 13 and the lower anchor tunnel 15 shorter. On the other hand, when the section to the ground is performed by the open-cut method, the start shaft 45 is ramped. If the tunnels 12a and 12b are close to the openings 12c and 12d of the ground G, it is possible to reduce the excavated portion of the ground. Therefore, it is preferable to appropriately select the position and depth of the start shaft 45 from the construction conditions, economy, and the like. In addition, it is also possible to construct | assemble each tunnel from an above-ground part, without providing such a starting shaft 45.

  In the construction of the merging / merging portion 10 from the start shaft 45 as described above, the ramp tunnels 12a and 12b are constructed until just before the construction position of the merging / merging portion 10 in the ground by continuing the excavation. Further, the upper anchor tunnel 13 is excavated to a position above the end of the junction / merging section 10 and the lower anchor tunnel 15 is excavated to a position below the end of the junction / merging section 10. At this time, excavation does not need to proceed simultaneously.

  Along with this excavation, the ground will be improved to the extent necessary for the safer construction of the branch and merge structure.

  The excavation of the ramp tunnels 12a and 12b is stopped, and the position corresponding to the position between the planned arrangement positions of the pair of ramp tunnels 12a and 12b in the branching junction 10 is higher than the planned arrangement positions. The upper anchor tunnel 13 is excavated and constructed. Further, the lower anchor tunnel 15 is excavated and constructed so as to be below the planned arrangement position and below the upper anchor tunnel 13 substantially vertically.

  The excavation method of the ramp tunnels 12a and 12b, the upper anchor tunnel 13 and the lower anchor tunnel 15 can be performed using an appropriate method such as a propulsion method or a shield method, preferably a shield method.

  In this manner, the support wall 17 is constructed as the upper anchor tunnel 13 and the lower anchor tunnel 15 in the merging / merging portion 10 are excavated and constructed, or after excavation and construction.

  Prior to excavation by the shield method or the like in this construction, support works (not shown) for reinforcing the upper anchor tunnel 13 and the lower anchor tunnel 15 are installed as necessary.

  A lower opening 13a is formed by opening a lower segment of the upper anchor tunnel 13 and a method such as a propulsion method, a shield method, a deep foundation method, etc. from the lower opening 13a toward the lower anchor tunnel 15 vertically below. Preferably, excavation is performed in the vertical direction by a propulsion method, and a large number of rectangular tube-shaped steel shells 17c are stacked one above the other and connected, and the outer shell of the support wall 17 is constructed in sequence. At this time, it is necessary to excavate and construct between the planned arrangement positions of the pair of lamp tunnels 12a and 12b of the merging and merging portion 10.

  The upper opening 15a is formed by opening the upper segment of the lower anchor tunnel 15 so that the outer shell of the support wall 17 passes through the upper opening 15a.

  The outer shell of the support wall 17 is continuously connected over the entire length of the merging and merging portion so as to connect the upper anchor tunnel 13 and the lower anchor tunnel 15 by connecting a number of steel shells 17c by repeating such an operation. Build up.

  Here, in the case of the propulsion method, the shape of the propulsion unit to be used is such that the cross-sectional direction of the branching / merging portion 10 has a thickness determined by structural studies, and the width in the extending direction of the branching / merging portion 10 takes into consideration workability. Thus, one having a side length of about 1 to 3 m is preferable. Even wider shapes can be used.

  In addition, after excavation of the supporting wall 17, the blade or propeller used in the propulsion method and the push tube are steel members and are used as a structure because they are steel shell members of the steel shell concrete of the supporting wall 17. can do. When the support wall 17 is made of reinforced concrete, the blade edge, the propulsion unit, or the push tube is used as an outer frame material, and the necessary reinforcing bars are arranged in the cross section and the concrete K is placed.

  Next, the upper floor girders 21a and 21b and the lower floor girders 23a and 23b are constructed from the main tunnels 11a and 11b.

  In this construction, it is necessary to partially remove and open the segments (covering bodies) from the frame of the main tunnels 11a and 11b. Therefore, in order to maintain the strength of the main tunnels 11a and 11b, the main tunnels 11a and 11b are previously provided. Is reinforced with a support (not shown).

  The upper floor girders 21a, 21b having a desired thickness can be constructed above the planned arrangement positions of the pair of lamp tunnels 12a, 12b so that the portions corresponding to the upper floor girders 21a, 21b of the main tunnels 11a, 11b can be constructed. Open the housing.

  Excavation is carried out by a method such as a propulsion method, a shield method, or the like, preferably a propulsion method, from the openings of the main tunnels 11a, 11b toward the support wall 17 in the horizontal direction. Are sequentially arranged in the horizontal direction and reach the support wall 17 to be connected. By repeating such an implementation and connecting a large number of steel shells 21c, the upper floor girders 21a and 21b are connected so as to connect the frame of the main tunnels 11a and 11b and the support wall 17 continuously over the entire length of the merging and merging portion. Build the outer shell.

  In addition, the lower floor girders 23a and 23b of the main tunnels 11a and 11b can be constructed so that a substantially horizontal lower floor girder 23a and 23b having a desired thickness can be constructed below the planned arrangement positions of the pair of lamp tunnels 12a and 12b. Open the housing of the corresponding part.

  Excavation is performed from the opening of the main tunnels 11a and 11b toward the support wall 17 in the horizontal direction by a method such as a propulsion method or a shield method, and a number of square-shaped steel shells 23c are sequentially formed in the horizontal direction. Arrange them so that they reach the support wall 17 and connect them. By repeating such an operation and connecting a large number of steel shells 23c, the lower floor girders 23a, 23b are connected so as to connect the frame of the main tunnels 11a, 11b and the support wall 17 continuously over the entire length of the merging and merging portion. Build the outer shell.

  Here, in the case of the propulsion method, the shape of the propulsion unit to be used is preferably a girder height determined by structural examination, and the width direction has a side length of about 1 to 3 m in consideration of workability. is there. Even wider shapes can be used.

  Next, upper reinforcing members 25a and 25b connecting the upper floor girders 21a and 21b and the casing of the upper anchor tunnel 13, and lower reinforcing members 27a and 27b connecting the lower reinforcing members 27a and 27b and the casing of the lower anchor tunnel 15 to each other. Are implemented from the main tunnels 11a and 11b side.

  A number of steel pipes 31a are made to reach the inclined opening 13b of the upper anchor tunnel 13 from the main tunnels 11a, 11b side of the upper floor girders 21a, 21b, and the support bar 31b is arranged therein. One end of the support bar 31b is coupled to the fixed base 33b of the coupling member 33a fixed to the upper end 17a of the support wall 17 in the upper anchor tunnel 13, and the other end is fixed to the fixed base 35a of the upper floor girders 21a and 21b. To join. The steel shells of the upper reinforcing members 25a and 25b are constructed by continuously arranging the steel pipe 31a and the support bar 31b over the entire length of the merging / merging portion.

  Further, a large number of steel pipes 31a are made to reach the inclined openings 15b of the lower anchor tunnel 15 from the main tunnels 11a, 11b side of the lower floor girders 23a, 23b, and the support bar 31b is disposed therein. One end of the support bar 31b is coupled to the fixed base 37b of the coupling member 37a fixed to the lower end 17b of the supporting wall 17 in the lower anchor tunnel 15, and the other end is fixed to the lower floor girders 23a and 23b. To join. The steel shells of the lower reinforcing members 27a and 27b are constructed by continuously arranging the steel pipe 31a and the support bar 31b over the entire length of the merging and merging portion.

  Thus, after the construction of the steel shell of each part is completed, the concrete K is cast and filled inside each part. Specifically, the entire inside of the outer shell of the support wall 17, the coupling members 33 a and 37 a side in the upper anchor tunnel 13 and the lower anchor tunnel 15, the entire inside of the coupling members 33 a and 37 a, and the entire inside of the outer shell of the upper floor girders 21 a and 21 b. The whole inside of the outer shell of the lower floor girders 23a, 23b, the whole inside of the entire steel pipe 31a of the upper reinforcing members 25a, 25b and the lower reinforcing members 27a, 27b. At this time, by placing concrete K on the connecting members 33a and 37a side in the upper anchor tunnel 13 and the lower anchor tunnel 15, the connection of the connecting members 33a and 37a can be further strengthened. At that time, filling the entire inside of the upper anchor tunnel 13 and the lower anchor tunnel 15 with the concrete K is also effective in strengthening the structure.

  As this concrete K, high fluidity concrete is suitable.

  By placing, filling, and hardening the concrete K, the upper anchor tunnel 13, the lower anchor tunnel 15, the support wall 17, the upper floor girders 21a and 21b, the lower floor girders 23a and 23b, the upper reinforcing members 25a and 25b, and A structure in which all the pipe reinforcing members 29 of the lower reinforcing members 27a and 27b are integrated is formed.

  Furthermore, concrete K is also laid in the main tunnels 11a and 11b to construct inverts 43a and 43b having evacuation paths 41a and 41b. This is preferably done before the construction of the lower floor girders 23a, 23b.

  Then, the end pipe roof 46 formed by arranging a number of steel pipes 31a and placing concrete K therein is provided on both end surfaces along the main tunnels 11a and 11b of the split junction 10. The end surfaces of the ramp tunnels 12a and 12b connected to the ground side are constructed in a range that does not block the tunnels. This is because at both ends, the shape of the lamp tunnel's housing changes greatly, so that natural ground is exposed.

  After such a structure is formed, the gaps between the upper floor girders 21a, 21b and the lower floor girders 23a, 23b on both sides of the supporting wall 17 are respectively formed into the segments of the main tunnels 11a, 11b. Are removed and sequentially excavated to form the junction tunnel spaces 20a and 20b including the lamp tunnels 12a and 12b and the communication portions between the lamp tunnels 12a and 12b and the main tunnels 11a and 11b. To do.

  Thereafter, the construction of the branching junction structure of the first embodiment is completed by removing the construction process of the wife part and unnecessary support work.

  When the merging / merging portion 10 is constructed as described above, excavation from the ground G side to the merging / merging portion 10 is performed, and the upper anchor tunnel 13 and the lower anchor tunnel 15 are constructed above and below the pair of ramp tunnels 12a and 12b. Then, a support wall 17 that connects the two is constructed, and the upper floor girders 21a and 21b that connect the frame of the main tunnels 11a and 11b and the support wall 17 by excavating between the main tunnels 11a and 11b and the support wall 17. And lower floor girders 23a and 23b are constructed, and the main tunnels 11a and 11b are opened and opened between the upper floor girders 21a and 21b and the lower floor girders 23a and 23b. Therefore, it is possible to form the dividing / merging portion spaces 20a and 20b on the ground G without forming wide openings corresponding to the dividing / merging portion spaces 20a and 20b. A.

  At the same time, in the state reinforced with sufficient strength by the upper floor girders 21a, 21b and the lower floor girders 23a, 23b connecting the main tunnels 11a, 11b and the supporting wall 17, the space between them is excavated, and the merging section spaces 20a, 20b Therefore, it is possible to construct the merging / merging space 20a, 20b extremely safely.

  In particular, the upper floor girders 21a and 21b and the lower floor girders 23a and 23b are reinforced by the upper reinforcing members 25a and 25b and the lower reinforcing member reinforcing members 27a and 27b, respectively, and then excavation between them is performed. It is possible.

  In addition, the upper floor girders 21a, 21b and the lower floor are respectively provided on both sides of the supporting wall 17 which can secure sufficient strength by the upper anchor tunnel 13 and the lower anchor tunnel 15 respectively disposed above and below the pair of ramp tunnels 12a, 12b. In order to provide the girders 23a and 23b, a pair of upper and lower anchor tunnels 13 and 15 and a supporting wall 17 may be constructed to form a pair of split and merge space 20a and 20b. 20b can be constructed.

  At the time of construction, the upper anchor tunnel 13 and the lower anchor tunnel 15 are constructed by excavating from the ground G side in parallel with the ramp tunnels 12a and 12b. During the construction of each tunnel, the opening formed on the ground G side can be concentrated, and the range thereof can be reduced.

  In particular, here, the ramp tunnels 12a, 12b, the upper anchor tunnel 13 and the lower anchor tunnel 15 are constructed by excavating from the common start shaft 45 on the ground G side, so each tunnel 12a, 12b, 13, The opening portion formed on the ground G side during the construction of 15 can be used as the opening of the start shaft 45, and the range of the opening portion on the ground G side can be further reduced.

  In the first embodiment, road tunnels have been described as the main line tunnels 11a and 11b. However, tunnels for other uses such as a subway formed in the ground may be used. Moreover, although the example of the access tunnel with the ground as the ramp tunnels 12a and 12b has been described, the present invention can be applied even to a ramp tunnel for connecting to another main tunnel. Further, the ramp tunnels 12a and 12b may be applied even if they are not provided in parallel with the main tunnels 11a and 11b as long as they are arranged adjacent to the main tunnels 11a and 11b in the junction 10. is there.

  Furthermore, in Embodiment 1 described above, a simpler configuration is adopted by making the casings of the lamp tunnels 12a and 12b common to the upper floor girders 21a and 21b and the lower floor girders 23a and 23b, Between the upper floor girders 21a and 21b and the lower floor girders 23a and 23b, the same frame as that of the ramp tunnels 12a and 12b in the section from the ground G side to the merging and merging portion 10 is disposed, and the adjacent main tunnel 11a , 11b side can be opened and communicated with the merging / merging space 20a, 20b and the main tunnels 11a, 11b.

  In the first embodiment, the structure in which the upper reinforcing members 25a and 25b and the lower reinforcing members 27a and 27b are provided is adopted. However, as long as the strength can be ensured, the structure can be applied even if they are not provided. It is.

Further, in the construction method described above, the support wall 17 is constructed from the upper anchor tunnel 13 toward the lower anchor tunnel 15, but it is also possible to construct from the lower anchor tunnel 15 toward the upper anchor tunnel 13. .
[Embodiment 2 of the Invention]

  FIG. 8 shows a branching junction structure according to the second embodiment of the present invention.

  In the merging / merging portion 10, the upper floor girder extension portions 47a and 47b continuous with the upper floor girders 21a and 21b, and the lower floor girder extension portion 49a continuous with the lower floor girders 23a and 23b, 49b. Here, reinforced concrete is used so that the upper and lower floor girder structures are continuous between the upper floor girder 21a, 21b and the upper floor girder extension 47a, 47b, and between the lower floor girder 23a, 23b and the lower floor girder extension 49a, 49b. Or it is manufactured with the same steel shell concrete as the upper and lower floor girders 21a. Others are the same as in the first embodiment.

In such a merging and merging portion structure, the same effects as in the first embodiment can be obtained, and the upper floor girder extension portions 47a and 47b continuous with the upper floor girders 21a and 21b can be provided in the frame of the main tunnels 11a and 11b. Since the lower floor girder 23a, 23b and the lower floor girder extension portions 49a, 49b are provided, the frame of the main tunnel 11a, 11b can be more integrally configured and reinforced, and the main tunnel 11a, It is easy to sufficiently secure the strength of the junction portion 11b.
Embodiment 3 of the Invention

  FIG. 9 shows a branching junction structure according to Embodiment 2 of the present invention.

  In the first and second embodiments, the junction / junction structure has a pair of main tunnels 11a and 11b and a pair of lamp tunnels 12a and 12b. However, in the second embodiment, one main tunnel 11a and A part of one lamp tunnel 12a arranged beside the main line tunnel 12a is communicated with each other to form a branching / merging portion 10.

  That is, in this branching section 10, the upper anchor tunnel 12 is disposed at a side position opposite to the main tunnel 11a of the ramp tunnel 12a so as to be above the ramp tunnel 12a, and below the ramp tunnel 13. Thus, a lower anchor tunnel 15 is disposed substantially vertically below the upper anchor tunnel 12 a, and the upper anchor tunnel 13 and the lower anchor tunnel 15 are connected by a support wall 17.

  The upper part of the main tunnel 11a on the lamp tunnel 12a side and the support wall 17 are connected by a continuous upper floor girder 21a extending in a substantially horizontal direction, while the lower part of the main tunnel 11a on the lamp tunnel 12a side is connected to the lower support girder 21a. The wall 17 is connected by a continuous lower floor girder 15 extending in a substantially horizontal direction, and a merging / merging space 20 a is formed between the upper floor girder 13 and the lower floor girder 15.

  Furthermore, an upper floor girder extension 47a continuous with the upper floor girder 21a and a lower floor girder extension 49a continuous with the lower floor girder 23a are provided in the main tunnel 11a.

Even with such a structure of the merging and merging portion 10, the same effect as in the first and second embodiments can be obtained.
[Embodiment 4]

  10 to 12 show a fourth embodiment of the present invention.

  The branching / merging portion 10 is the same as the first embodiment except that the support wall 17, the upper floor girders 21a and 21b, and the lower floor girders 23a and 23b are different in excavation and construction method.

  First, as in the first embodiment, the upper anchor tunnel 13, the ramp tunnels 12a and 12b, and the lower anchor tunnel 15 are excavated from the start shaft 45, and the ramp tunnels 12a and 12b are constructed at the construction position of the junction 10 in the ground. The upper anchor tunnel 13 and the lower anchor tunnel 15 are excavated and constructed in the merging / merging portion 10.

  Thereafter, in the first embodiment, for example, a rectangular rectangular propulsion machine having a side length of 1 to 3 m is used, and for example, excavation is performed in the vertical direction or the width direction orthogonal to the orientation direction of the main tunnels 11a and 11b. While the support wall 17, the upper floor girders 21 a and 21 b, and the lower floor girders 23 a and 23 b were constructed by repeating sequentially, in the fourth embodiment, a rectangular plate-like propulsion machine having a long side is provided. For example, by excavating along the orientation direction of the main tunnels 11a and 11b, the support wall 17, the upper floor girders 21a and 21b, and the lower floor girders 23a and 23b are excavated and constructed.

  In order to perform such excavation and construction, here, from the upper anchor tunnel 13 side toward the lower anchor tunnel 15 side at a position in the vicinity of the merging / merging portion 10 immediately before the construction position of the merging / merging portion 10. The start shaft 51 of the plate-shaped propulsion device 59 is formed by excavation. When reaching the position corresponding to the upper floor girders 21a, 21b during the excavation of the start shaft 51, excavation is made toward the main tunnels 11a, 11b, and the plate propulsion devices 61a, 61b for the upper floor girders 21a, 21b are started. The shafts 53a and 53b are formed. Further, when the starting pit 51 reaches the position corresponding to the lower floor girders 23a and 23b after excavating, the excavation is made toward the main tunnels 11a and 11b, and the plate propulsion machines 63a and 63b for the lower floor girders 23a and 23b are obtained. 63b start shafts 55a and 55b are formed.

  After the starting shafts 51, 53a, 53b, 55a, 55b of the plate-like propulsion devices 59, 61a, 61b, 63a, 63b are respectively formed, the main lines are formed by the plate-like propulsion devices 59, 61a, 61b, 63a, 63b. By digging in the orientation direction of the tunnels 11a and 11b, the support wall 17, the upper floor girders 21a and 21b, and the lower floor girders 23a and 23b are constructed.

  At this time, the support wall 17 is excavated and constructed while sequentially opening the respective housings so that the upper end portion 17 a protrudes into the upper anchor tunnel 13 and the lower end portion 17 b protrudes into the lower anchor tunnel 15. Further, the upper floor girders 21a and 21b and the lower floor girders 23a and 23b are excavated and constructed while sequentially opening the respective frames so as to protrude into the main tunnels 11a and 11b, respectively.

  Then, the entire length of the merging and merging portion 10 is excavated, and each plate-shaped excavator 59, 61a, 61b, 63a, 63b is left as a steel shell, and concrete K is placed to complete the construction. Others are the same as in the first embodiment.

  Thereby, the branching / merging portion structure of the fourth embodiment is constructed. And even if it constructs | assembles a junction part structure in this way, the effect similar to Embodiment 1 can be acquired.

It is a top view which shows the division | segmentation junction part of Embodiment 1 of this invention, and its periphery. It is AA sectional drawing of FIG. It is sectional drawing which shows the dividing / merging part structure of Embodiment 1 of this invention. It is an expanded partial sectional view of the upper anchor tunnel in the branching junction structure of Embodiment 1 of this invention. It is an expanded fragmentary sectional view which shows a junction part with the upper floor girder of the upper reinforcement member in the branching junction structure of Embodiment 1 of this invention. It is an expanded partial sectional view of the lower anchor tunnel in the branching junction structure of Embodiment 1 of this invention. It is an expanded fragmentary sectional view which shows a junction part with the lower floor girder of the lower reinforcement member in the splitting junction structure of Embodiment 1 of this invention. It is sectional drawing which shows the dividing / merging part structure of Embodiment 2 of this invention. It is sectional drawing which shows the dividing / merging part structure of Embodiment 3 of this invention. It is a top view which shows the dividing and joining part of Embodiment 4 of this invention, and its periphery. It is BB sectional drawing of FIG. It is sectional drawing which shows the time of construction | assembly of the dividing / merging part of Embodiment 4 of this invention.

Explanation of symbols

G Ground 10 Split junction 11a, 11b Main tunnel 12a, 12b Ramp tunnel 13 Upper anchor tunnel 15 Lower anchor tunnel 17 Support wall 21a, 21b Upper floor girder 23a, 23b Lower floor girder 25a, 25b Upper reinforcing member 27a, 27b Lower reinforcing member 45 Starting shaft 47a, 47b Upper floor girder extension 49a, 49b Lower floor girder extension

Claims (9)

In the merging and merging portion structure in which the main tunnel and a part of the ramp tunnel arranged next to the main tunnel at the merging and merging portion are communicated,
An upper anchor tunnel disposed above the ramp tunnel at a side position opposite to the main tunnel of the ramp tunnel; and a substantially vertical lower side of the upper anchor tunnel below the ramp tunnel. A lower anchor tunnel disposed so as to have a supporting wall connecting the upper anchor tunnel and the lower anchor tunnel,
The upper part of the main tunnel and the support wall on the lamp tunnel side are connected by an upper floor girder that is continuous in a substantially horizontal direction, and the lower part of the main tunnel on the lamp tunnel side and the support wall, It is connected by a lower floor girder that is continuous in a substantially horizontal direction,
A merging / merging portion structure in which a merging / merging portion space communicating the main tunnel and the ramp tunnel is formed between the upper floor girder and the lower floor girder. A pair of main tunnels are disposed, and a part of the lamp tunnel of one main tunnel is disposed adjacent to the pair of main tunnels at the junction and a part of the lamp tunnel of the other main tunnel is formed. In the junction structure that is arranged adjacent to the pair of main tunnels, and each main tunnel and a part of the lamp tunnel communicate with each other,
An upper anchor tunnel disposed above the pair of ramp tunnels at a position corresponding to between the pair of ramp tunnels, and a substantially vertical position of the upper anchor tunnel below the pair of ramp tunnels. A lower anchor tunnel disposed to be below, and a supporting wall that connects the upper anchor tunnel and the lower anchor tunnel,
The upper part of the main body tunnel on the lamp tunnel side of the main line tunnel and the support wall are connected to each other by upper floor girders that are continuous in a substantially horizontal direction, and the lower part of the main line tunnel on the side of the lamp tunnel and the support wall. Are connected by lower floor girders that are substantially horizontal,
A merging / merging portion structure in which a merging / merging portion space is formed between the upper floor girder and the lower floor girder on both sides of the support wall to communicate each main tunnel and its ramp tunnel.   The upper reinforcing member that connects the upper anchor tunnel and the upper floor girder, and the lower reinforcing member that connects the lower anchor tunnel and the lower floor girder, according to claim 1 or 2, Split junction structure.   4. An upper floor girder extension portion that is continuous with the upper floor girder and a lower floor girder extension portion that is continuous with the lower floor girder are provided in a housing of the main line tunnel. The split junction structure described in 1. Next to the main tunnel, in the method of constructing a junction / merging section in which a part of the ramp tunnel is placed adjacent to and communicated at the junction /
While constructing an upper anchor tunnel so as to be above the ramp tunnel at a position opposite to the main tunnel of the ramp tunnel,
A lower anchor tunnel is constructed so as to be below the ramp tunnel and substantially vertically below the upper anchor tunnel,
Build a support wall that connects the two by excavating between the upper anchor tunnel and the lower anchor tunnel in the merging section,
An upper floor girder that connects the main tunnel body and the support wall by digging in a substantially horizontal direction between the upper part of the main tunnel and the support wall on the ramp tunnel side,
A lower floor girder that connects the main tunnel body and the support wall by excavating the lower part of the main tunnel on the ramp tunnel side and the support wall in a substantially horizontal direction,
Between the upper floor girder and the lower floor girder, the main tunnel is opened and excavated to form a merging / merging space that connects the main tunnel and the ramp tunnel. How to build a department. Between a pair of main tunnels, a part of the lamp tunnel of one main tunnel is arranged adjacent to each other at the junction and a part of the lamp tunnel of the other main tunnel is arranged adjacent to each other. In the construction method of the merging and merging part that communicates with each part,
While constructing an upper anchor tunnel to be above the pair of ramp tunnels at a position corresponding to between the pair of ramp tunnels,
A lower anchor tunnel is constructed so as to be below the pair of ramp tunnels and substantially vertically below the upper anchor tunnel,
Build a supporting wall that connects the upper anchor tunnel and the lower anchor tunnel,
On both sides of the support wall, an upper floor girder that connects the support tunnel wall and the support wall of each main tunnel is excavated in a substantially horizontal direction between the upper part of the main tunnel on the ramp tunnel side and the support wall. And
Similarly, on both sides of the support wall, a lower floor girder that digs in a substantially horizontal direction between the lower part of the main tunnel on the ramp tunnel side and the support wall to connect the main tunnel body and the support wall. Build
Between the upper floor girder and the lower floor girder on both sides of the support wall, excavation is performed by opening the frame of the main line tunnel, respectively, so as to form a junction space that communicates the main line tunnel and the ramp tunnel. A method for constructing a merging / merging section characterized by:   The construction method of the branching junction according to claim 5 or 6, wherein the upper anchor tunnel and the lower anchor tunnel are constructed by excavating from the ground side in parallel with the ramp tunnel.   The construction method of the branching junction according to claim 7, wherein the ramp tunnel, the upper anchor tunnel, and the lower anchor tunnel are constructed by excavating from a common shaft on the ground side.   Before excavating between the upper floor girder and the lower floor girder, an upper reinforcing member that connects the upper anchor tunnel and the upper floor girder, and a lower reinforcing member that connects the lower anchor tunnel and the lower floor girder The method for constructing a branching / merging portion according to claim 5, wherein:

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