JP2006283285A - Tunnel joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel joining method reducing a removal range of a tunnel skeleton, a soil improving range and a tunnel site width. <P>SOLUTION: In joining the upper half parts of a main tunnel 1 and a ramp tunnel 3, skin plates of segments 13a, 13b out of facing segments of the main tunnel 1 and ramp tunnel 3 are removed first to excavate an excavated part 17a between the main tunnel 1 and ramp tunnel 3. The remaining parts of the segments 13a, 13b are removed to install a connection part 19a between the segment 25 of the main tunnel 1 and the segment 31 of the ramp tunnel 3. The connection part 19a has a frame member 27 with one end fixed to the segment 25; H-shape steel 29 with the other end fixed to the segment 31; and axial reinforcing members 39 arranged in the axial direction of the tunnel between the adjacent H-shape steel 29. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tunnel joining method.

  2. Description of the Related Art Conventionally, when constructing a branching / merging portion of a tunnel such as an underground road or a subway, a method of constructing a tunnel having a widened portion by using a tunnel excavator that can change a sectional shape of excavation (for example, Patent Document 1) And a method of joining a plurality of tunnels (for example, see Patent Document 2).

JP 2004-68333 A JP 2004-353264 A

  However, when joining a plurality of tunnels, if the parts to be joined are separated from each other, the housing of the structure is largely removed, and a large joining member is reconstructed. Furthermore, there are cases where it is necessary to improve the surrounding ground over a wide range, but if auxiliary methods such as ground improvement and freezing methods are frequently used, problems remain in terms of safety in addition to construction cost and construction period.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a tunnel joining method capable of reducing the tunnel housing removal range, ground improvement range, and tunnel ground width. is there.

  In order to achieve the above-mentioned object, the present invention includes a step (a) of constructing a first tunnel and a second tunnel, and an upper half of the segments facing each other of the first tunnel and the second tunnel. (B) excavating the ground between the first tunnel and the second tunnel by removing the skin plate of the predetermined segment of the part or the lower half, and the first tunnel and the second And a step (c) of providing a connecting portion for connecting to the other tunnel.

  The connection part installed in the step (c) is, for example, one of the following six types. The connection portion of the first type is composed of a piece of material having one end fixed to the first tunnel, and a rod-shaped steel material having one end fixed to the piece and the other end fixed to the second tunnel. The top material is fixed to the second tunnel using a short bolt joint.

  The second type connecting portion is composed of a piece of material having one end fixed to the first tunnel, and a rod-shaped steel material having one end fixed to the piece and the other end fixed to the second tunnel. The top material is fixed to the second tunnel using a long bolt joint.

  The connection part of the third type includes a piece of material having one end fixed to the first tunnel, a bar-shaped steel material having one end fixed to the frame, and the other end fixed to the second tunnel, It consists of a hinge joint fixed between steel materials.

  The connection part of the 4th type is arranged between two plate-like materials whose one end is fixed to the first tunnel, one end is fixed to the second tunnel, and the other end is between the two plate-like materials. And made of mortar or concrete filled between two plate-like materials.

  A fifth type of connection comprises a variable segment with one end of the inner member secured to the first tunnel and one end of the outer member secured to the second tunnel. The variable segment can be adjusted in length by sliding the inner member relative to the outer member.

  The connection portion of the sixth type has a reinforcing bar arranged at one end in the first segment constituting the first tunnel and at the other end in the second segment constituting the second tunnel, It consists of the plate-shaped member fixed to the internal surface of 1 segment and the 2nd segment in parallel or perpendicular | vertical to a reinforcing bar, and the concrete installed around the reinforcing bar. The plate-like member is provided with a hole for passing a reinforcing bar and a notch for enhancing the filling property of concrete as necessary.

  The first tunnel constructed in the step (a) is, for example, a main tunnel having a substantially D-shaped circumferential section, and the second tunnel is a lamp tunnel having a circular section in the circumferential direction. . In the step (c), in the step (c), the connecting portion is installed so as to pass between the main beams of the segment from which the skin plate has been removed in the step (b). Alternatively, the whole or a part of the remaining part of the segment from which the skin plate has been removed in the step (b) (such as the main girder of the segment) is removed, and the connecting portion is installed. In this invention, you may further provide the process (d) which installs a truss material in the tunnel inner peripheral side of a connection part.

  ADVANTAGE OF THE INVENTION According to this invention, the joining method of the tunnel which can reduce the removal range of a tunnel frame, the range of ground improvement, and the tunnel ground width can be provided.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a view showing each process for forming the composite tunnel 23 by connecting the main tunnel 1 and the lamp tunnel 3, and FIG. 2 is a view of the composite tunnel 23 as viewed from above. As shown in FIG. 1, the main tunnel 1 is installed in the ground 11 and has a substantially D-shaped circumferential section. The lamp tunnel 3 is installed in the ground 11 and has a circular cross section in the circumferential direction. In the formation portion of the synthetic tunnel 23, the distance between the main tunnel 1 and the lamp tunnel 3 gradually changes as shown in FIG.

  In the first embodiment, a method of joining the main tunnel 1 and the lamp tunnel 3 will be described. FIG. 1A shows a process of installing a supporting work inside the main tunnel 1 and the ramp tunnel 3. In FIG. 1A, first, a vertical support 5 a is installed inside the main tunnel 1, and a vertical support 5 b is installed inside the ramp tunnel 3. Further, a horizontal support 7 a is installed inside the main tunnel 1 and a horizontal support 7 b is installed inside the ramp tunnel 3.

  FIG. 1B shows a process of excavating the excavation part 17 a of the ground 11. After the support is installed as shown in FIG. 1 (a), the freezing method is applied to the ground 11 above and below the main tunnel 1 and the ramp tunnel 3 as shown in FIG. 1 (b). Use to improve the ground. Then, the skin plate of the segment 13a in the upper half of the main tunnel 1 and the skin plate of the segment 13b in the upper half of the ramp tunnel 3 are removed, and the excavation part 17a between the main tunnel 1 and the ramp tunnel 3 is excavated. The support work 15a is installed in the excavation part 17a. 1, 14, and 18, the dotted line portion of the segment 13 indicates that the skin plate has been removed.

  FIG. 1C illustrates a process of excavating the excavation part 17b by installing the connection part 19a. In FIG. 1 (c), the remaining portion (girder, etc.) of the segment 13a in the upper half of the main tunnel 1 and the segment 13b in the upper half of the ramp tunnel 3 with the skin plate removed in FIG. 1 (b). ). Next, a connecting portion 19 a that connects the upper half portions of the main tunnel 1 and the lamp tunnel 3 is installed. The detailed structure of the connecting portion 19a will be described later. After the connection part 19a is installed, the excavation part 17a located on the outer peripheral side of the connection part 19a is backfilled 21. The backfill 21 is performed using a backfill material such as locally generated soil or mortar.

  In FIG. 1C, the skin plate of the side segment 14a of the main tunnel 1 facing the lamp tunnel 3 and the skin plate of the side segment 14b of the lamp tunnel 3 facing the main tunnel 1 are respectively shown. The excavation part 17b below the excavation part 17a is excavated, and the support work 15b is installed in the excavation part 17b.

  When the freezing method is used for the ground improvement 9 in the process shown in FIG. 1B, the ground above the main tunnel 1 and the ramp tunnel 3 at an appropriate time after the backfill 21 is performed. 11 freezing is released.

  FIG. 1D is a diagram showing a process of excavating the excavation part 17c. In FIG. 1D, the skin plate of the segment 13c in the lower half of the main tunnel 1 and the skin plate of the segment 13d in the lower half of the ramp tunnel 3 are removed, and the space between the main tunnel 1 and the ramp tunnel 3 is removed. Excavation part 17c is excavated.

  FIG. 1 (e) shows a process of installing the connecting portion 19b to complete the composite tunnel 23. FIG. In FIG. 1 (e), the remaining part (girder etc.) of the segment 13c in the lower half of the main tunnel 1 and the segment 13d in the lower half of the ramp tunnel 3 with the skin plate removed in FIG. 1 (d). ). Next, a connecting portion 19b that connects the lower half portions of the main tunnel 1 and the lamp tunnel 3 is installed.

  In FIG. 1 (e), after the connection portion 19b is installed, the excavation portion 17c located on the outer peripheral side of the connection portion 19b is backfilled (not shown). And the remaining part of the segment 14a of the main tunnel 1 and the segment 14b of the ramp tunnel 3, the vertical support 5a, the vertical support 5b, the horizontal support 7a, the horizontal support 7b, the support 15a, the support The synthetic tunnel 23 is completed by removing 15b.

  In addition, when the freezing method is used for the ground improvement 9 in the process shown in FIG. 1B, after the backfilling (not shown), the ground 11 below the main tunnel 1 and the ramp tunnel 3 is used. Unfreeze.

  Below, the detailed structure of the connection part 19a is described. 3 is a perspective view of the vicinity of the connecting portion 19a, and FIG. 4 is a cross-sectional view of the vicinity of the connecting portion 19a. As shown in FIGS. 3 and 4, the connecting portion 19 a is installed between the end face 26 of the segment 25 of the main tunnel 1 and the end face 28 of the segment 31 of the lamp tunnel 3. The end face 26 and the end face 28 are newly provided as a reinforcing material in the segment 25 and the segment 31. Alternatively, joint plates of the segment 25 and the segment 31 may be used as the end surface 26 and the end surface 28. As shown in FIG. 2, the length of the connecting portion 19 a varies depending on the installation interval between the main tunnel 1 and the lamp tunnel 3.

  4A is a horizontal sectional view of the portion shown in FIG. 2A, and FIG. 4B is a vertical sectional view of the portion shown in FIG. 4A is a cross-sectional view taken along C2-C2 in FIG. 4B, and FIG. 4B is a cross-sectional view taken along C1-C1 in FIG. 4A.

  As shown in FIGS. 3, 4A and 4B, the connecting portion 19a has a piece 27 of which one end is fixed to the end face 26 of the segment 25 and one end of the connecting piece 19a. An H-shaped steel 29 fixed to the end and the other end fixed to the end face 28 of the segment 31, an axial reinforcing material 39 that reinforces a space between two adjacent H-shaped steels 29, and the like. The top member 27 is fixed on the extension of the joint surface between the rings of the segment 25, and the H-shaped steel 29 is fixed on the extension of the joint surface between the rings of the segment 31.

  As shown in FIGS. 4A and 4B, the top member 27 is obtained by fixing joint plates 33 to both ends of H-shaped steel, for example. The joint plate 33 is fixed perpendicularly to the axial direction of the H-shaped steel. The H-shaped steel 29 is obtained by fixing joint plates 35 to both ends of the H-shaped steel. The joint plate 35 is fixed perpendicularly to the axial direction of the H-shaped steel. The axial reinforcing member 39 is, for example, H-shaped steel.

  The joint plate 33 of the top member 27 and the end surface 26 of the segment 35, the joint plate 33 of the top member 27 and the joint plate 35 of the H-shaped steel 29, the joint plate 35 of the H-shaped steel 29 and the end surface 28 of the segment 31, respectively, It is fixed by the nut 37. One end of the axial reinforcing member 39 is inserted between the upper and lower flanges of the H-shaped steel 29. The other end of the axial reinforcing member 39 is inserted between the upper and lower flanges of another adjacent H-shaped steel 29. The end of the axial reinforcing member 39 is fixed to the web or flange of the H-shaped steel 29.

  In FIG. 4, the end portion of the axial reinforcing material 39 such as H-shaped steel is inserted between the upper and lower flanges of the H-shaped steel 29, but the axial reinforcing material is an H-shaped steel whose flange is longer than the web. The end of the flange may be disposed so as to sandwich the upper and lower flanges of the H-shaped steel 29, and the flange of the H-shaped steel 29 and the flange of the axial reinforcing material may be fixed.

  4C is a horizontal sectional view of the portion shown in FIG. 2B, and FIG. 4D is a vertical sectional view of the portion shown in FIG. 4C is a cross-sectional view taken along line C4-C4 in FIG. 4D, and FIG. 4D is a cross-sectional view taken along line C3-C3 in FIG. 4C.

  As shown in FIGS. 4C and 4D, in the portion shown in B of FIG. 2, the configuration of the connecting portion 19a is substantially the same as the portion shown in A of FIG. In the connection portion 19a shown in FIG. 2B, the piece material 27a and the error absorbing plate 41 are used instead of the piece material 27 of the connection portion 19a shown in FIG.

  As shown in FIGS. 4 (c) and 4 (d), the top member 27a has, for example, joint plates 33a fixed to both ends of an H-shaped steel. The joint plate 33a at one end is fixed perpendicularly to the axial direction of the H-shaped steel, and the joint plate 33a at the other end is fixed at a predetermined angle with the axial direction of the H-shaped steel.

  The joint plate 33 a of the top member 27 a and the end face 26 of the segment 25 are fixed by a short bolt and a nut 37. The joint plate 33a of the top member 27a and the joint plate 35 of the H-shaped steel 29 are fixed by short bolts and nuts 37 with the error absorbing plate 41 sandwiched therebetween.

  In order to form the connecting portion 19a as shown in FIG. 4, the piece material 27 and the H-shaped steel 29 or the piece material 27a, the error absorbing plate 41 and the H-shaped steel 29 are installed between the segment 25 and the segment 31. The step and the step of inserting the end portion of the axial reinforcing member 39 between the flanges of the H-shaped steel 29 are sequentially repeated in the tunnel axial direction. Then, concrete or mortar (not shown) is filled between the adjacent H-shaped steels 29.

  When forming the connecting portion 19a, the size of the top material 27 and the top material 27a is constant, and the change in the length of the connecting portion 19a accompanying the change in the distance between the main tunnel 1 and the lamp tunnel 3 includes H The length of the steel plate 29 is changed to cope with it. In the portion using the top material 27a, several types of error absorbing plates 41 having different thicknesses are prepared, and the construction error is absorbed by using the error absorbing plate 41 having an appropriate thickness.

  In the first embodiment, the connecting portion 19b shown in FIG. 1 is also configured by the same members and methods as the connecting portion 19a.

  As described above, in the first embodiment, the main tunnel 1 and the ramp tunnel 3 are connected in the process shown in FIG. Range, tunnel width can be reduced. Moreover, as shown in FIG. 4, when forming the connection part 19a, it is possible to suppress the cross-sectional force to be smaller than that of the RC structure by using a steel material such as H-shaped steel 29 having a relatively low weight and bending rigidity. It becomes. In the connecting portion 19a shown in FIG. 4, it is possible to cope with a certain degree of construction error with a simple structure using the top material 27, the top material 27a and the error absorbing plate 41.

  In the first embodiment, the connecting portion 19 has a structure like the connecting portion 19a shown in FIG. 4, but the structure of the connecting portion 19 is not limited to this.

  FIG. 5 is a cross-sectional view of the vicinity of the connecting portion 19c having another structure. 5A is a horizontal sectional view of the portion shown in FIG. 2A, and FIG. 5B is a vertical sectional view of the portion shown in FIG. 5A is a cross-sectional view taken along J2-J2 in FIG. 5B, and FIG. 5B is a cross-sectional view taken along J1-J1 in FIG. 5A.

  The connecting portion 19c shown in FIG. 5 has substantially the same configuration as the connecting portion 19a shown in FIG. 4, but an axial reinforcing member 39a is used instead of the axial reinforcing member 39. The axial reinforcing member 39a reinforces the space between the two adjacent H-shaped steels 29 and the two adjacent piece members 27. The axial reinforcing member 39a is, for example, an H-shaped steel whose web is longer than the flange. Both ends of the web of the axial reinforcing member 39 a are inserted between the upper and lower flanges of the H-shaped steel 29 and the piece member 27. Both ends of the flange and web of the axial reinforcing member 39a are fixed to the flange and web of the H-shaped steel 29 and the top member 27.

In the connecting portion 19 c, concrete or mortar (not shown) is filled between the adjacent H-shaped steel 29 and the piece material 27.
The configuration of the connecting portion 19c shown in FIG. 5 can also be applied to the connecting portion 19a in the portion shown in B of FIG. 2 and the connecting portion 19b shown in FIG.

  FIG. 6 is a cross-sectional view of the vicinity of the connecting portion 19d having another structure. 6A is a horizontal sectional view of the portion shown in FIG. 2A, and FIG. 6B is a vertical sectional view of the portion shown in FIG. 6A is a cross-sectional view taken along line K2-K2 in FIG. 6B, and FIG. 6B is a cross-sectional view taken along line K1-K1 in FIG. 6A.

  The connecting portion 19d shown in FIG. 6 has substantially the same configuration as the connecting portion 19a shown in FIG. 4, but a plate 99 is used in place of the axial reinforcing member 39. The plate 99 reinforces the space between the two adjacent H-shaped steels 29 and the two adjacent frame members 27. The plate 99 is a single plate material. The plate 99 is fixed to the outside of the upper and lower flanges of the H-shaped steel 29 and the piece material 27 by welding or the like.

In the connecting portion 19 d, concrete (not shown) is filled between the adjacent H-shaped steel 29 and the piece material 27.
The configuration of the connecting portion 19d shown in FIG. 6 can also be applied to the connecting portion 19a in the portion shown in B of FIG. 2 and the connecting portion 19b shown in FIG.

  FIG. 7 is a cross-sectional view of the vicinity of the connecting portion 19e having another structure. 7A shows a horizontal sectional view of the portion shown in FIG. 2A, and FIG. 7B shows a vertical sectional view of the portion shown in FIG. 7A is a cross-sectional view taken along line L2-L2 in FIG. 7B, and FIG. 7B is a cross-sectional view taken along line L1-L1 in FIG. 7A.

  The connection portion 19e shown in FIG. 7 has substantially the same configuration as the connection portion 19a shown in FIG. 4, but a plate 101 is used in place of the axial reinforcing member 39. The plate 101 reinforces the space between the two adjacent H-shaped steels 29 and the two adjacent frame members 27. The plate 101 is a rod-shaped plate material. In the connection portion 19 e, the plurality of plates 101 are fixed to the outside of the upper and lower flanges of the H-shaped steel 29 and the piece material 27 using bolts and nuts 103.

In the connecting portion 19e, concrete or mortar (not shown) is filled between the adjacent H-shaped steel 29 and the piece 27.
The configuration of the connecting portion 19c shown in FIG. 7 can also be applied to the connecting portion 19a in the portion shown in B of FIG. 2 and the connecting portion 19b shown in FIG.

  Even when the connecting portion 19 has a structure as shown in FIGS. 5 to 7, by using a steel material such as H-shaped steel 29 having a relatively low self-weight and bending rigidity, the cross-sectional force can be suppressed smaller than that of the RC structure. Is possible. In addition, a simple structure using the top material 27, the top material 27a, and the error absorbing plate 41 can cope with a certain degree of construction error.

  Next, a second embodiment will be described. FIG. 8 shows a cross-sectional view in the vicinity of the connecting portion 19 f of another structure and a cross-sectional view of the piece member 43. In the second embodiment, as in the first embodiment, the main tunnel 1 and the lamp tunnel 3 are joined by the steps shown in FIG. 1, but the connection 19 is connected to the connection 19a shown in FIG. Instead of this, a connecting portion 19f shown in FIG. 8 is used.

  8A shows a horizontal sectional view of the portion shown in FIG. 2A, and FIG. 8B shows a vertical sectional view of the portion shown in FIG. 8A is a cross-sectional view taken along D2-D2 in FIG. 8B, and FIG. 8B is a cross-sectional view taken along D1-D1 in FIG. 8A.

  As shown in FIGS. 8A and 8B, the connecting portion 19f has a piece 43 fixed at one end to the end face 26 of the segment 25, and one fixed to the other end of the piece 43. The other end includes an H-shaped steel 29 fixed to the end surface 28 of the segment 31, an axial reinforcing material 39 that reinforces a space between two adjacent H-shaped steels 29, and the like. The top member 43 is fixed on the extension of the joint surface between the rings of the segment 25, and the H-shaped steel 29 is fixed on the extension of the joint surface between the rings of the segment 31.

  As shown in FIG. 8 (a), FIG. 8 (b), and FIG. 8 (c), the H-shaped steel 29 is obtained by fixing joint plates 35 to both ends of the H-shaped steel. The joint plate 35 is fixed perpendicularly to the axial direction of the H-shaped steel. The axial reinforcing member 39 is, for example, H-shaped steel.

  FIG. 8C shows a cross-sectional view of the piece material 43. 8 (a), FIG. 8 (b), and FIG. 8 (c), the top member 43 includes, for example, a cylindrical body 49, a cylindrical body 49a, a joint plate 45, and a joint plate 45a. , A long bolt 47, a spherical nut 53, a nut 51, a mortar 55, and the like.

  The cylinder 49 and the cylinder 49a have a rectangular cross section. The joint plate 45 is disposed in the segment 25 substantially parallel to the end face 26. The joint plate 45a is installed substantially parallel to the end face 26 of the segment 25 at the boundary between the cylindrical body 49 and the cylindrical body 49a. The long bolt 47 is disposed through the joint plate 45, the end face 26 of the segment 25, the joint plate 45 a, and the joint plate 35 of the H-shaped steel 29. The spherical nut 53 and the nut 51 are installed on the long bolt 47. The mortar 55 is filled in the cylindrical body 49 and the cylindrical body 49 a, between the end face 26 of the segment 25 and the joint plate 45 of the top member 43.

  The top member 43 and the segment 25 are fixed by installing a spherical nut 53 on the long bolt 47 at the position of the joint plate 45. The top member 43 and the H-shaped steel 29 are fixed by installing a nut 51 on the long bolt 47 at the position of the joint plate 35. The joint plate 35 of the H-shaped steel 29 and the end face 28 of the segment 31 are fixed by short bolts and nuts 37. One end of the axial reinforcing member 39 is inserted between the upper and lower flanges of the H-shaped steel 29. The other end of the axial reinforcing member 39 is inserted between the upper and lower flanges of another adjacent H-shaped steel 29.

  When connecting the top member 43, the segment 25, and the H-shaped steel 29, first, the long bolt 47 is passed through the joint plate 45, the end face 26 of the segment 25, the joint plate 45a, and the joint plate 35 of the segment 31, The spherical nut 53 and the nut 51 are fixed to the bolt 47. Next, the cylindrical body 49 is installed between the end face 26 of the segment 25 and the joint plate 45 a, and the cylindrical body 49 a is installed between the joint plate 45 a and the joint plate 35 of the segment 31. And the mortar 55 is filled into the inside of the cylinder 49 and the cylinder 49a, between the end surface 26 of the segment 25, and the joint plate 45 of the top member 43.

  8D is a horizontal sectional view of the portion shown in FIG. 2B, and FIG. 8E is a vertical sectional view of the portion shown in FIG. 8D is a cross-sectional view taken along D4-D4 in FIG. 8E, and FIG. 8E is a cross-sectional view taken along D3-D3 in FIG. 8D.

  As shown in FIGS. 8D and 8E, in the portion shown in B of FIG. 2, the configuration of the connecting portion 19f is substantially the same as the portion shown in A of FIG. 2B, a piece of material 43a is used in place of the piece of material 43 of the connecting part 19f of the portion shown in FIG. 2A.

  As shown in FIGS. 8D and 8E, the top member 43a has substantially the same configuration as the top member 43, but instead of the cylindrical body 49, the joint plate 45a, and the mortar 55. A cylindrical body 49b, a joint plate 45b, and a mortar 55a are provided.

  The cylinder 49b has a rectangular cross section. The joint plate 45b is installed at a boundary between the cylindrical body 49b and the cylindrical body 49a at a predetermined angle with the end surface 26 of the segment 25. The mortar 55a is filled in the cylindrical body 49a and the cylindrical body 49b, and between the end face 26 of the segment 25 and the joint plate 45 of the top member 43a.

  The top member 43 a and the segment 25 are fixed by installing a spherical nut 53 on the long bolt 47 at the position of the joint plate 45. The top member 43a and the H-shaped steel 29 are fixed by installing a nut 51 on the long bolt 47 at the position of the joint plate 35.

  When connecting the piece 43a, the segment 25, and the H-shaped steel 29, first, the long bolt 47 is passed through the joint plate 45, the end face 26 of the segment 25, the joint plate 45b, and the joint plate 35 of the segment 31, The spherical nut 53 and the nut 51 are fixed to the bolt 47. Next, the cylindrical body 49 b is installed between the end face 26 of the segment 25 and the joint plate 45 b, and the cylindrical body 49 a is installed between the joint plate 45 b and the joint plate 35 of the segment 31. And the mortar 55a is filled into the inside of the cylindrical body 49b and the cylindrical body 49a, between the end face 26 of the segment 25, and the joint plate 45 of the top member 43.

  In order to form the connecting portion 19f as shown in FIG. 8, the step of installing the top member 43 and the H-shaped steel 29 or the top member 43a and the H-shaped steel 29 between the segment 25 and the segment 31, and the H-shaped steel The step of inserting the end portion of the axial reinforcing member 39 between the 29 flanges is sequentially repeated in the tunnel axial direction. Then, concrete (not shown) is filled between the adjacent H-shaped steels 29.

  When forming the connecting portion 19f, the sizes of the top member 43 and the top member 43a are constant, and the change in the length of the connecting portion 19f accompanying the change in the distance between the main tunnel 1 and the lamp tunnel 3 includes H The length of the steel plate 29 is changed to cope with it.

  In the second embodiment, the connecting portion 19b shown in FIG. 1 is also configured by the same members and methods as the connecting portion 19f.

  Also in the second embodiment, the main tunnel 1 and the ramp tunnel 3 are connected in the process as shown in FIG. 1, so that when the synthetic tunnel 23 is formed, the tunnel housing removal range, ground improvement range, tunnel The site width can be reduced. Further, as shown in FIG. 8, when forming the connecting portion 19f, the cross-sectional force can be suppressed to be smaller than that of the RC structure by using a steel material such as H-shaped steel 29 having a relatively low self-weight or bending rigidity. It becomes. In the connection part 19f shown in FIG. 8, the construction error can be dealt with by filling the mortar 55 and the mortar 55a inside the top material 43 and the top material 43a.

  Next, a third embodiment will be described. FIG. 9 shows a cross-sectional view in the vicinity of the connecting portion 19g having another structure. In the third embodiment, as in the first embodiment, the main tunnel 1 and the lamp tunnel 3 are joined by the steps shown in FIG. 1, but the connection 19 is connected to the connection 19a shown in FIG. Instead of this, a connecting portion 19g shown in FIG. 9 is used.

  9A is a horizontal sectional view of the portion shown in FIG. 2A, and FIG. 9B is a vertical sectional view of the portion shown in FIG. 9A is a cross-sectional view taken along line E2-E2 in FIG. 9B, and FIG. 9B is a cross-sectional view taken along line E1-E1 in FIG. 9A.

  As shown in FIGS. 9A and 9B, the connecting portion 19g has a piece 57 fixed at one end to the end face 26 of the segment 25 and one end fixed to the end face 28 of the segment 31. The H-shaped steel 29, the hinge joint 65 and the hinge joint 67 that connect the top material 57 and the H-shaped steel 29, the axial reinforcing material 39 that reinforces the space between two adjacent H-shaped steels 29, and the like. The top member 57 is fixed on the joint surface extension between the rings of the segment 25, and the H-shaped steel 29 is fixed on the joint surface extension between the rings of the segment 31.

  As shown in FIGS. 9A and 9B, the piece material 57 is, for example, a rectangular box. The H-shaped steel 29 is obtained by fixing joint plates 35 to both ends of the H-shaped steel. The joint plate 35 is fixed perpendicularly to the axial direction of the H-shaped steel. The hinge joint 65 has a fixed plate 63 at one end. The hinge joint 67 has a fixed plate 61 at one end. The axial reinforcing member 39 is, for example, H-shaped steel.

  The top member 57 and the end surface 26 of the segment 35, the joint plate 35 of the H-shaped steel 29, and the end surface 28 of the segment 31 are fixed by short bolts and nuts 37, respectively. The fixing plate 59 of the top member 57 and the end portion of the hinge joint 65 that does not have the fixing plate 63 are fixed by welding or the like. The fixing plate 63 of the hinge joint 65 and the end portion of the hinge joint 67 that does not have the fixing plate 61 are fixed by welding or the like. The fixing plate 61 of the hinge joint 67 and the joint plate 35 of the H-shaped steel 29 are fixed by welding or the like. One end of the axial reinforcing member 39 is inserted between the upper and lower flanges of the H-shaped steel 29. The other end of the axial reinforcing member 39 is inserted between the upper and lower flanges of another adjacent H-shaped steel 29.

  9C is a horizontal sectional view of the portion shown in FIG. 2B, and FIG. 9D is a vertical sectional view of the portion shown in FIG. 9C is a cross-sectional view taken along line E4-E4 in FIG. 9D, and FIG. 9D is a cross-sectional view taken along line E3-E3 in FIG. 9C.

  As shown in FIGS. 9C and 9D, in the portion shown in B of FIG. 2, the configuration of the connecting portion 19g is the same as the portion shown in A of FIG.

  In the connecting portion 19 g shown in FIG. 9, the H-shaped steel 29 can be rotated in the horizontal direction with respect to the top material 57 by the hinge joint 65. In addition, the hinge joint 67 allows the H-shaped steel 29 to rotate in the vertical direction with respect to the piece material 57.

  In order to form the connecting portion 19g as shown in FIG. 9, the step of installing the top member 57, the hinge joint 65, the hinge joint 67, and the H-shaped steel 29 between the segment 25 and the segment 31, The step of inserting the end portion of the axial reinforcing member 39 between the flanges is sequentially repeated in the tunnel axial direction. Then, concrete (not shown) is filled between the adjacent H-shaped steels 29.

  When forming the connecting portion 19g, the sizes of the top member 57, the hinge joint 65, and the hinge joint 67 are made constant, and the change in the length of the connecting portion 19g according to the change in the distance between the main tunnel 1 and the lamp tunnel 3 is achieved. This is dealt with by changing the length of the H-shaped steel 29.

  In 3rd Embodiment, the connection part 19b shown in FIG. 1 is also comprised by the member and method similar to the connection part 19g.

  Also in the third embodiment, the main tunnel 1 and the ramp tunnel 3 are connected in the process as shown in FIG. 1, so that when the synthetic tunnel 23 is formed, the tunnel housing removal range, ground improvement range, tunnel The site width can be reduced. Further, as shown in FIG. 9, when forming the connecting portion 19g, it is possible to suppress the sectional force to be smaller than that of the RC structure by using a steel material such as H-shaped steel 29 having a relatively low self-weight or bending rigidity. It becomes. In the connection part 19g shown in FIG. 9, by using the hinge joint 65 and the hinge joint 67, a three-dimensional construction error can be absorbed.

  Next, a fourth embodiment will be described. FIG. 10 is a cross-sectional view of the vicinity of the connection portion 19h having another structure. In the fourth embodiment, as in the first embodiment, the main tunnel 1 and the lamp tunnel 3 are joined by the steps shown in FIG. 1, but the connection 19 is connected to the connection 19a shown in FIG. Instead of this, a connecting portion 19h shown in FIG. 10 is used.

  10A shows a horizontal sectional view of the portion shown in FIG. 2A, and FIG. 10B shows a vertical sectional view of the portion shown in FIG. 10A is a cross-sectional view taken along line F2-F2 in FIG. 10B, and FIG. 10B is a cross-sectional view taken along line F1-F1 in FIG.

  As shown in FIGS. 10A and 10B, the connecting portion 19 h has a plate 71 having one end fixed to the end surface 26 of the segment 25, and one end fixed to the end surface 28 of the segment 31. An H-shaped steel 29a, a mortar 75 that connects the plate 71 and the H-shaped steel 29a, an axial reinforcing material 39 that reinforces a space between two adjacent H-shaped steels 29a, and the like. The plate 71 is fixed on the joint surface extension between the rings of the segment 25, and the H-shaped steel 29 a is fixed on the joint surface extension between the rings of the segment 31.

  As shown in FIGS. 10 (a) and 10 (b), the plate 71 includes, for example, two flat plates arranged substantially in parallel and a joint plate fixed to one end of the two flat plates. 69. The two flat plates constituting the plate material 71 are provided with studs 73 on opposing surfaces as necessary. The H-shaped steel 29a is obtained by fixing a joint plate 35 to one end of the H-shaped steel. The joint plate 35 is fixed perpendicularly to the axial direction of the H-shaped steel, and a reinforcing material 71 is provided at a corner where the H-shaped steel 29a and the joint plate 35 are formed. In the H-shaped steel 29a, studs 73 are provided on both surfaces of the flange as necessary. The axial reinforcing member 39 is, for example, H-shaped steel.

  The joint plate 69 of the plate 71 and the end surface 26 of the segment 35, and the joint plate 35 of the H-shaped steel 29a and the end surface 28 of the segment 31 are fixed by short bolts and nuts 37, respectively. The end portion of the H-shaped steel 29 a that does not have the joint plate 35 is inserted between two flat plates constituting the plate material 71. One end of the axial reinforcing member 39 is inserted between the upper and lower flanges of the H-shaped steel 29a. The other end of the axial reinforcing member 39 is inserted between the upper and lower flanges of another adjacent H-shaped steel 29a. A mortar 75 is filled between the two flat plates of the plate material 71.

  FIG. 10C shows a horizontal sectional view of the portion shown in FIG. 2B, and FIG. 10D shows a vertical sectional view of the portion shown in FIG. 10C is a cross-sectional view taken along line F4-F4 in FIG. 10D, and FIG. 10D is a cross-sectional view taken along line F3-F3 in FIG. 10C.

  As shown in FIGS. 10 (c) and 10 (d), in the portion shown in B of FIG. 2, the constituent members of the connecting portion 19h are the same as those shown in A of FIG.

  In order to form the connecting portion 19h as shown in FIG. 10, the plate material 71, the H-shaped steel 29a and the mortar 75 are installed between the segment 25 and the segment 31, and the axial direction between the flanges of the H-shaped steel 29a. The step of inserting the end portion of the reinforcing member 39 is sequentially repeated in the tunnel axis direction. Then, concrete (not shown) is filled between adjacent H-shaped steels 29a.

  When forming the connecting portion 19h, the size of the plate member 71 is constant, and the change in the length of the connecting portion 19h accompanying the change in the distance between the main tunnel 1 and the lamp tunnel 3 is the length of the H-shaped steel 29a. Change and respond.

  In 4th Embodiment, the connection part 19b shown in FIG. 1 is also comprised by the member and method similar to the connection part 19h.

  Also in the fourth embodiment, the main tunnel 1 and the ramp tunnel 3 are connected in the process as shown in FIG. 1, so that when the synthetic tunnel 23 is formed, the tunnel housing removal range, ground improvement range, tunnel The site width can be reduced. In addition, as shown in FIG. 10, when forming the connecting portion 19h, the cross-sectional force can be suppressed smaller than that of the RC structure by using a steel material such as H-shaped steel 29a having a relatively low weight and bending rigidity. It becomes. In the connecting portion 19h shown in FIG. 10, the three-dimensional construction error is absorbed by inserting the H-shaped steel 29a fixed to the segment 31 between the two flat plates constituting the plate material 71 fixed to the segment 25. it can.

  Next, a fifth embodiment will be described. FIG. 11 shows a cross-sectional view of the vicinity of the connecting portion 19i of another structure and a perspective view of the variable segment 77. FIG. In the fifth embodiment, as in the first embodiment, the main tunnel 1 and the lamp tunnel 3 are joined by the steps shown in FIG. 1, but the connection 19 is connected to the connection 19a shown in FIG. Instead of this, a connecting portion 19i shown in FIG. 11 is used.

  11A is a horizontal sectional view of the portion shown in FIG. 2A, and FIG. 11B is a vertical sectional view of the portion shown in FIG. 11A is a cross-sectional view taken along line G2-G2 in FIG. 11B, and FIG. 11B is a cross-sectional view taken along line G1-G1 in FIG. 11A. FIG. 11 (c) shows a perspective view of the variable segment 77.

  As shown in FIG. 11 (a), FIG. 11 (b), and FIG. 11 (c), the variable segment 77 includes an outer member 79, an inner member 81, a sealing material 85, a sealing material 87, and the like. Consists of. The outer member 79 and the inner member 81 are obtained by fixing a joint plate 83 to one end of a groove-shaped main body having a U-shaped cross section. The width and height of the main body of the inner member 81 are smaller than the width and height of the main body of the outer member 79, and the outer member 79 and the inner member 81 are arranged in a nested manner.

  A sealing material 85 is provided between the inner surface of the main body of the outer member 79 and the outer surface of the main body of the inner member 81. A sealing material 87 is provided on the outer surface of the main body of the outer member 79. The body of the outer member 79 is provided with a hole that is a length fixing portion 91. The joint plate 83 of the outer member 79 and the joint plate 83 of the inner member 81 are installed at opposing positions. The joint plate 83 is provided with a bolt hole 89.

  The main body of the outer member 79 and the inner member 81 of the variable segment 77 is made of, for example, steel. As the sealing material 85 and the sealing material 87, a normal sealing material or a liquid sealing material is used. The length of the variable segment 77 can be adjusted by sliding the inner member 81 with respect to the outer member 79.

  As shown in FIGS. 11A and 11B, the connecting portion 19i has a piece 43 fixed at one end to the end face 26 of the segment 25 and one end fixed to the other end of the piece 43. The other end includes a variable segment 77 fixed to the end face 28 of the segment 31. In the connecting portion 19i, the top material 43 and the variable segment 77 are juxtaposed with no gap.

  As the top material 43, the material used in the second embodiment (FIGS. 8A to 8C) is used. The top member 43 and the segment 25 are fixed by installing a spherical nut 53 on the long bolt 47 at the position of the joint plate 45. The top member 43 and the variable segment 77 are fixed by installing the nut 51 on the long bolt 47 at the position of the joint plate 83 of the inner member 81. The joint plate 83 of the outer member 79 of the variable segment 77 and the end face 28 of the segment 31 are fixed by short bolts and nuts 37.

  In the variable segment 77, after adjusting the length by sliding the inner member 81 with respect to the outer member 79, a bolt (not shown) is screwed into the length fixing portion 91 of the outer member 79. 81. The length of the variable segment 77 is fixed by friction between a bolt (not shown) and the inner member 81.

  In the state shown in FIG. 11A, the sealing material 85 maintains the water stoppage between the outer member 79 and the inner member 81. Further, the sealing material 87 keeps the water stoppage between the outer members 79 of the adjacent variable segments 77.

  11D is a horizontal sectional view of the portion shown in FIG. 2B, and FIG. 11E is a vertical sectional view of the portion shown in FIG. 11D is a cross-sectional view taken along line G4-G4 in FIG. 11E, and FIG. 11E is a cross-sectional view taken along line G3-G3 in FIG. 11D.

  As shown in FIGS. 11D and 11E, in the portion shown in B of FIG. 2, the constituent members of the connecting portion 19i are substantially the same as the portion shown in A of FIG. 2B, a piece of material 43a is used in place of the piece of material 43 of the portion of connecting part 19i shown in FIG. 2A. The top material 43a is the same as that used in the second embodiment (FIG. 8D and FIG. 8E).

  In order to form the connecting portion 19i as shown in FIG. 11, the step of installing the top member 43 and the variable segment 77 or the top member 43a and the variable segment 77 between the segment 25 and the segment 31, Repeat sequentially in the tunnel axis direction.

  When forming the connecting portion 19i, the sizes of the top member 43 and the top member 43a are made constant, and the change in the length of the connecting portion 19i accompanying the change in the distance between the main tunnel 1 and the lamp tunnel 3 is variable. Corresponding by changing the length of the expression segment 77.

  In the fifth embodiment, the connecting portion 19b shown in FIG. 1 is also configured by the same members and methods as the connecting portion 19i.

  Also in the fifth embodiment, the main tunnel 1 and the ramp tunnel 3 are connected in the process as shown in FIG. 1, so that when the synthetic tunnel 23 is formed, the tunnel housing removal range, ground improvement range, tunnel The site width can be reduced. Moreover, as shown in FIG. 11, when the connection part 19i is formed, the installation range of cast-in-place concrete can be suppressed by using a variable segment 77 made of steel or the like. In the connection part 19i shown in FIG. 11, a construction error can be absorbed by using the variable segment 77 whose length can be adjusted at the site.

  Next, a sixth embodiment will be described. FIG. 12 is a cross-sectional view of the vicinity of the connecting portion 19j having another structure. In the sixth embodiment, as in the first embodiment, the main tunnel 1 and the lamp tunnel 3 are joined by the steps shown in FIG. 1, but the connection 19 is connected to the connection 19a shown in FIG. Instead of this, a connecting portion 19j shown in FIG. 12 is used.

  12A is a vertical sectional view of the portion shown in FIG. 2A, and FIG. 12B and FIG. 12C are vertical sectional views of the connecting portion 19j. . 12B is a cross-sectional view taken along line M1-M1 in FIG. 12A, and FIG. 12B is taken along line M2-M2 (M3-M3) in FIG. It is sectional drawing. FIG. 12D shows a perspective view of the vicinity of the end of the segment 25 (segment 31) before the concrete 109 is installed.

  As shown in FIG. 12, the connecting portion 19 j includes a steel plate 115 fixed to the inner surface of the segment 25 (segment 31), a reinforcing bar 117, one end disposed in the segment 25, and the other end disposed in the segment 31, a reinforcing bar 117. It consists of concrete 109 etc. installed around the.

  The steel plate 115 is obtained by processing notches 121 and holes 119 in the vertical ribs of the segments 25 and 31. One end of the reinforcing bar 117 is inserted into the hole 119 of the steel plate 115 fixed to the segment 25, and the other end is inserted into the hole 119 of the steel plate 115 fixed to the segment 31. The concrete 109 is placed around the reinforcing bar 117. In the connection part 19j, the notch part 121 is provided in the steel plate 115, whereby the filling properties of the concrete 109 into the segments 25 and 31 are enhanced.

  In order to form the connecting portion 19j as shown in FIG. 12, the step of installing the reinforcing bar 117 between the segment 25 and the segment 31 and the step of placing the concrete 109 are sequentially repeated in the tunnel axis direction.

  When forming the connecting portion 19j, the length of the reinforcing bar 117 is changed in response to the change in the length of the connecting portion 19j accompanying the change in the distance between the main tunnel 1 and the lamp tunnel 3.

  In the sixth embodiment, the connecting portion 19b shown in FIG. 1 is also configured by the same members and methods as the connecting portion 19j.

  Also in the sixth embodiment, the main tunnel 1 and the lamp tunnel 3 are connected in the process as shown in FIG. 1, so that when the synthetic tunnel 23 is formed, the tunnel housing removal range, ground improvement range, tunnel The site width can be reduced. In addition, as shown in FIG. 12, when the connecting portion 19j is formed, a large number of reinforcing bars 117 can be arranged by using the steel plate 115 in which the holes 119 and the notches 121 are processed in the vertical ribs of the segment 25 and the segment 31. . In addition, compared with conventional coupler-type joints, lap-type joints, and the like, force can be efficiently transmitted from the reinforcing bars 117 to the segments 25 and 31.

  In addition, the shape of the steel plate fixed to the segment 25 or the segment 31 is not limited to that shown in FIG. FIG. 13 is a perspective view of the vicinity of the end of the segment 25 (segment 31) to which a steel plate having another shape is fixed.

  In the segment 25 (segment 31) shown in FIG. 13A, a steel plate 123 parallel to the skin plate of the segment 25 (segment 31) is fixed to the inner surface of the segment 25 (segment 31). The ends of the reinforcing bars 117 are arranged in parallel to the steel plate 123 in the segment 25 (segment 31).

  The steel plate 125 fixed to the inner surface of the segment 25 (segment 31) shown in FIG. 13 (b) is formed by bending the bottom rib of the segment 25 (segment 31) into an L-shape. is there. The steel plate 125 has a plurality of holes 127. The end of the reinforcing bar 117 is inserted into the hole 127 of the steel plate 125 in the segment 25 (segment 31).

  A steel plate 129 fixed to the inner side surface of the segment 25 (segment 31) shown in FIG. 13C is obtained by providing a notch 141 and a hole 133 in the vertical rib of the segment 25 (segment 31). . The end of the reinforcing bar 117 is inserted into the hole 131 of the steel plate 129 in the segment 25 (segment 31).

  Even when a steel plate as shown in FIG. 13 is used, many reinforcing bars 117 can be arranged. In addition, compared with conventional coupler-type joints, lap-type joints, and the like, force can be efficiently transmitted from the reinforcing bars 117 to the segments 25 and 31.

  Next, a seventh embodiment will be described. FIG. 14 is a diagram showing steps for connecting the main tunnel 1 and the lamp tunnel 3 to form the composite tunnel 23a. As shown in FIG. 14, the main tunnel 1 is installed in the ground 11 and has a substantially D-shaped circumferential section. The lamp tunnel 3 is installed in the ground 11 and has a circular cross section in the circumferential direction. In the formation portion of the composite tunnel 23a, the interval between the main tunnel 1 and the lamp tunnel 3 gradually changes.

  In the seventh embodiment, a method of joining the main tunnel 1 and the lamp tunnel 3 will be described. FIG. 14A shows a process of excavating the excavation part 17d and excavation part 17e of the ground 11 and installing a support work. In FIG. 14A, first, ground improvement 9 is performed on the ground 11 above and below the main tunnel 1 and the ramp tunnel 3 using a freezing method or the like.

  Then, the skin plate of the segment 14c in the upper half of the main tunnel 1 and the skin plate of the segment 14d in the upper half of the ramp tunnel 3 are removed, and the excavation portion 17d between the main tunnel 1 and the ramp tunnel 3 is excavated. A horizontal support 7c passing through the excavation part 17d is installed between the main tunnel 1 and the ramp tunnel 3.

  Further, the skin plate of the segment 14e in the lower half of the main tunnel 1 and the skin plate of the segment 14f in the lower half of the ramp tunnel 3 are removed, and an excavation 17e between the main tunnel 1 and the ramp tunnel 3 is excavated. A horizontal support 7c passing through the excavation part 17e is installed between the main line tunnel 1 and the ramp tunnel 3.

  FIG. 14B shows a process of excavating the excavation part 17f. In FIG. 14B, the excavation part 17d and excavation part 17e excavated in FIG. 14A are backfilled. Then, the skin plate of the segment 13e in the upper half of the main tunnel 1 and the skin plate of the segment 13f in the upper half of the ramp tunnel 3 are removed, and the excavation part 17f between the main tunnel 1 and the ramp tunnel 3 is excavated.

  FIG. 14C shows a process of installing the connecting portion 19c. 14 (c), the main girder of the upper half segment 13e of the main tunnel 1 from which the skin plate has been removed in FIG. A connecting portion 19k that connects the upper half portions of the main tunnel 1 and the lamp tunnel 3 through the girder is installed. The detailed structure of the connecting portion 19k will be described later. After the connection portion 19k is installed, backfilling 21 of the excavation portion 17f located on the outer peripheral side of the connection portion 19k is performed. The backfill 21 is performed using a backfill material such as locally generated soil or mortar.

  In addition, when the freezing method is used for the ground improvement 9 in the step shown in FIG. 14A, the ground above the main tunnel 1 and the ramp tunnel 3 at an appropriate time after the backfill 21 is performed. 11 freezing is released.

  FIG. 14D is a diagram illustrating a process of excavating the excavation unit 17d, the excavation unit 17e, the excavation unit 17f, the excavation unit g, the excavation unit 17h, and the excavation unit 17i. 14D, the skin plate of the upper half segment 14g of the main tunnel 1 and the skin plate 14h of the upper half segment 14h of the lamp tunnel 3 are removed, and the space between the main tunnel 1 and the lamp tunnel 3 is removed. Excavation part 17g is excavated. Moreover, the excavation part 17d is excavated again.

  Further, the skin plate of the segment 14 i in the center portion of the main tunnel 1 and the skin plate of the segment 14 j in the center portion of the ramp tunnel 3 are removed, and the excavation portion 17 h between the main tunnel 1 and the ramp tunnel 3 is excavated. Moreover, the excavation part 17e is excavated again.

  Further, the skin plate of the segment 13 g in the lower half of the main tunnel 1 and the skin plate of the segment 13 h in the lower half of the ramp tunnel 3 are removed, and an excavation part 17 i between the main tunnel 1 and the ramp tunnel 3 is excavated.

  FIG. 14E shows a process of installing the connecting portion 19d and completing the synthetic tunnel 23a. In FIG. 14 (e), the main girder of the lower half segment 13g of the main tunnel 1 from which the skin plate is removed in FIG. A connecting portion 19l that connects the lower half portions of the main tunnel 1 and the lamp tunnel 3 through the girder is installed.

  In FIG. 14 (e), after the connection portion 19l is installed, the excavation portion 17i located on the outer peripheral side of the connection portion 19l is backfilled (not shown). Then, the segment 14c, segment 14e, segment 14g, remaining portion of the segment 14i of the main tunnel 1, the segment 14d, segment 14f, segment 14h, the remaining portion of the segment 14j of the ramp tunnel 3, the horizontal support 7c, the horizontal direction The support work 7c is removed, and the synthetic tunnel 23a is completed.

  In addition, when the freezing method is used for the ground improvement 9 in the process shown in FIG. 14A, after the backfilling (not shown), the ground 11 below the main tunnel 1 and the ramp tunnel 3 is used. Unfreeze.

  Below, the detailed structure of the connection part 19k is described. 15 is a perspective view of the vicinity of the connection portion 19k, and FIG. 16 is a cross-sectional view of the vicinity of the connection portion 19k. FIG. 15 is a perspective view of the portion shown in FIG. As shown in FIGS. 15 and 16, the connecting portion 19 k is installed between the main beam of the segment 25 of the main tunnel 1 and between the main beam of the segment 31 of the ramp tunnel 3.

  16A is a horizontal sectional view of the portion shown in FIG. 5, and FIG. 16B is a vertical sectional view of the portion shown in FIG. 16A is a cross-sectional view taken along line H2-H2 in FIG. 16B, and FIG. 16B is a cross-sectional view taken along line H1-H1 in FIG.

  As shown in FIGS. 15 and 16 (a) and 16 (b), the connecting portion 19k has an attachment jig 93 fixed to the inner peripheral surface of the segment 25, and one end of the attachment jig 93. The frame member 27 fixed to 93, one end fixed to the other end of the frame member 27, the other end fixed to the mounting jig 93, and the mounting jig fixed to the inner peripheral surface of the segment 31. The tool 93, the axial reinforcing material 39 that reinforces the space between two adjacent H-shaped steels 29, and the like.

  As shown in FIG. 16, the attachment jig 93 includes a joint plate 95 parallel to the end surfaces 97 of the segments 25 and 31, a reinforcing plate 98 perpendicular to the joint plate 95, and the like. The reinforcing plate 98 of the mounting jig 93 is fixed to the inner peripheral surfaces of the segment 25 and the segment 31 by welding or the like. Welding of the reinforcing plate 98 of the mounting jig 93 is performed at the site or factory. At this time, the joint plate 95 is disposed below the end surfaces 97 of the segment 25 and the segment 31.

  As the top member 27, the H-shaped steel 29, and the axial direction reinforcing member 39, the same materials as those used in the first embodiment (FIG. 4 (a) and FIG. 4 (b)) are used. The joint plate 33 of the top member 27 and the joint plate 95 of the mounting jig 93, the joint plate 33 of the top member 27 and the joint plate 35 of the H-shaped steel 29, the joint plate 35 of the H-shaped steel 29 and the joint plate of the mounting jig 93 95 is fixed by a short bolt and a nut 37, respectively. One end of the axial reinforcing member 39 is inserted between the upper and lower flanges of the H-shaped steel 29. The other end of the axial reinforcing member 39 is inserted between the upper and lower flanges of another adjacent H-shaped steel 29.

  As shown in FIG. 2, the length of the connecting portion 19 varies depending on the installation interval between the main tunnel 1 and the lamp tunnel 3. In the portion shown in FIG. 2B, the configuration of the connecting portion 19k is substantially the same as the portion shown in FIG. 2A (FIG. 16). In the connection portion 19k shown in FIG. 2B, the piece material 27a and the error absorbing plate 41 are used instead of the piece material 27 of the connection portion 19k shown in FIG.

  That is, the connection part 19k of the part shown in B of FIG. 2 has the end part of the piece 27a of the connection part 19a shown in FIG. 4 (c) and FIG. 4 (d), and the end part of the H-shaped steel 29. It is fixed to the joint plate 95 of the mounting jig 93, and the reinforcing plate 98 of the mounting jig 93 is fixed to the inner peripheral surfaces of the segments 25 and 31 by welding or the like.

  When forming the connecting portion 19k, the sizes of the top material 27 and the top material 27a are fixed, and the change in the length of the connecting portion 19k due to the change in the distance between the main tunnel 1 and the lamp tunnel 3 includes H The length of the steel plate 29 is changed to cope with it. In the portion using the top material 27a, several types of error absorbing plates 41 having different thicknesses are prepared, and the construction error is absorbed by using the error absorbing plate 41 having an appropriate thickness.

  In the seventh embodiment, the connecting portion 19l shown in FIG. 14 is also configured by the same members and methods as the connecting portion 19k.

  As described above, in the seventh embodiment, the main tunnel 1 and the ramp tunnel 3 are connected in a process as shown in FIG. 14, so that when the synthetic tunnel 23 a is formed, the removal range of the tunnel frame and the ground improvement are improved. Range, tunnel width can be reduced. Also, as shown in FIG. 16, when forming the connecting portion 19k, the cross-sectional force can be suppressed smaller than that of the RC structure by using a steel material such as H-shaped steel 29 having a relatively low weight and bending rigidity. It becomes. In the connecting portion 19k shown in FIG. 16, a simple construction using the top material 27, the top material 27a and the error absorbing plate 41 can cope with a certain degree of construction error.

  In the seventh embodiment, the connecting portion 19 has a structure like the connecting portion 19k shown in FIG. 16, but the structure of the connecting portion 19 is not limited to this.

  FIG. 17 is a cross-sectional view of the vicinity of the connecting portion 19m having another structure. 17A is a horizontal sectional view of the portion shown in FIG. 15, and FIG. 17B is a vertical sectional view of the portion shown in FIG. 17A is a cross-sectional view taken along the line I2-I2 in FIG. 17B, and FIG. 17B is a cross-sectional view taken along the line I1-I1 in FIG.

  As shown in FIGS. 17A and 17B, the connecting portion 19m has an attachment jig 93a fixed to the inner peripheral surface of the segment 25, and one end fixed to the attachment jig 93a. The frame piece 27, one end fixed to the other end of the piece member 27, the other end fixed to the attachment jig 93a, the H-shaped steel 29, the attachment jig 93a fixed to the inner peripheral surface of the segment 31, It consists of the axial direction reinforcement material 39 etc. which reinforce the space between two adjacent H-shaped steel 29. FIG.

  As shown in FIG. 17, the attachment jig 93a includes a joint plate 97a obtained by extending end surfaces of the segment 25 and the segment 31, a reinforcing plate 98 perpendicular to the joint plate 97a, and the like. The reinforcing plate 98 of the mounting jig 93 is fixed to the inner peripheral surfaces of the segment 25 and the segment 31.

  As the top material 27, the H-shaped steel 29, and the axial direction reinforcing material 39, the same materials as those used in the seventh embodiment (FIG. 16) are used. The joint plate 33 of the top member 27 and the joint plate 97a of the mounting jig 93, the joint plate 33 of the top member 27 and the joint plate 35 of the H-shaped steel 29, the joint plate 35 of the H-shaped steel 29 and the joint plate of the mounting jig 93 97a is fixed by a short bolt and a nut 37, respectively. One end of the axial reinforcing member 39 is inserted between the upper and lower flanges of the H-shaped steel 29. The other end of the axial reinforcing member 39 is inserted between the upper and lower flanges of another adjacent H-shaped steel 29.

  In the seventh embodiment, the connecting portion 19 is attached to another connecting portion as shown in FIGS. 5 to 12 and the attachment jig 93 for the connecting portion 19k shown in FIG. 16 or the connecting portion 19m shown in FIG. A combination of the jig 93a for use may be used.

  Next, an eighth embodiment will be described. FIG. 18 is a diagram showing steps for connecting the main tunnel 1 and the lamp tunnel 3 to form the composite tunnel 23b. As shown in FIG. 18, the main tunnel 1 is installed in the ground 11 and has a substantially D-shaped circumferential cross section. The lamp tunnel 3 is installed in the ground 11 and has a circular cross section in the circumferential direction. In the formation portion of the composite tunnel 23b, the distance between the main tunnel 1 and the lamp tunnel 3 gradually changes.

  In the eighth embodiment, a method of joining the main tunnel 1 and the lamp tunnel 3 will be described. FIG. 18A shows a process of excavating the excavation part 17j and excavation part 17k of the ground 11 and installing the upper chord material 105a. In FIG. 18A, first, ground improvement 9 is performed on the ground 11 above and below the main tunnel 1 and the ramp tunnel 3 using a freezing method or the like.

  Then, the skin plate of the segment 14k in the upper half of the main tunnel 1 and the skin plate of the segment 14l in the upper half of the ramp tunnel 3 are removed, and an excavation portion 17j between the main tunnel 1 and the ramp tunnel 3 is excavated. The lower chord material 109a passing through the excavation part 17j is installed between the main tunnel 1 and the ramp tunnel 3.

  Further, the skin plate of the segment 13 i in the upper half of the main tunnel 1 and the skin plate of the segment 13 j in the upper half of the ramp tunnel 3 are removed, and the excavation part 17 k between the main tunnel 1 and the ramp tunnel 3 is excavated. Next, the remaining portions of the segments 13i and 13j are removed, and the upper chord material 105a that connects the upper half portions of the main tunnel 1 and the lamp tunnel 3 is installed. The upper chord material 105a corresponds to the connecting portion 19a of the first embodiment, and has the same configuration as the connecting portion 19a shown in FIG.

  FIG. 18B shows a process of installing the truss member 107a and excavating the excavation part 17l, the excavation part 17m, and the excavation part 17n. In FIG. 18 (b), truss members 107a are installed in the excavation part 17j and excavation part 17k excavated in FIG. 18 (a). The truss member 107a is disposed between the upper chord member 105a and the lower chord member 109a along the inner peripheral side of the upper chord member 105a. Next, the backfill 21 of the excavation part 17k located on the outer peripheral side of the upper chord material 105a is performed. The backfill 21 is performed using a backfill material such as locally generated soil or mortar.

  When the freezing method is used for the ground improvement 9 in the step shown in FIG. 18A, the ground above the main tunnel 1 and the ramp tunnel 3 at an appropriate time after the backfill 21 is performed. 11 freezing is released.

  In FIG. 18B, after the backfill 21 is performed, the skin plate of the segment 14m at the center of the main tunnel 1 and the skin plate of the segment 14n at the center of the ramp tunnel 3 are removed, and the main tunnel 1 and The excavation part 17 l between the ramp tunnel 3 is excavated, and a horizontal support 7 d passing through the excavation part 17 l is installed between the main tunnel 1 and the ramp tunnel 3.

  In addition, the skin plate of the segment 14o in the lower half of the main tunnel 1 and the skin plate of the segment 14p in the lower half of the ramp tunnel 3 are removed, and the excavation portion 17m between the main tunnel 1 and the ramp tunnel 3 is excavated. Thus, the lower chord material 109b passing through the excavation part 17l is installed between the main tunnel 1 and the ramp tunnel 3.

  Further, the skin plate of the segment 13k in the lower half of the main tunnel 1 and the skin plate of the segment 13l in the lower half of the ramp tunnel 3 are removed, and an excavation portion 17n between the main tunnel 1 and the ramp tunnel 3 is excavated. .

  FIG. 18C is a diagram illustrating a process of installing the upper chord member 105b and the truss member 107b. In FIG. 18C, the remaining portion of the lower half segment 13k of the main tunnel 1 and the remaining portion 13l of the lower half segment 13l of the ramp tunnel 3 are removed, and the main tunnel 1 and the ramp tunnel 3 are removed. An upper chord material 105b that connects the lower halves is installed. The upper chord material 105b corresponds to the connecting portion 19b of the first embodiment.

  In FIG. 18 (c), after the upper chord member 105b is installed, the backfill 21 of the excavation part 17n located on the outer peripheral side of the upper chord member 105b is performed. And truss material 107b is installed in the excavation part 17m and excavation part 17n which were excavated in FIG.18 (b) figure. The truss member 107b is disposed between the upper chord member 105b and the lower chord member 109b along the inner peripheral side of the upper chord member 105b.

  When the freezing method is used for the ground improvement 9 in the process shown in FIG. 18A, after the backfill 21 is performed, the freezing of the ground 11 below the main tunnel 1 and the ramp tunnel 3 is released. To do.

  FIG. 18D shows a process of removing the horizontal support 7d and the like to complete the synthetic tunnel 23a. In FIG. 18 (d), the segment 14m of the main tunnel 1, the remaining portion of the segment 14o, the segment 14n of the ramp tunnel 3, the remaining portion of the segment 14p, and the horizontal support 7d are removed, and the synthetic tunnel 23b is removed. Complete.

  As described above, in the eighth embodiment, the main tunnel 1 and the ramp tunnel 3 are connected in a process as shown in FIG. 18, so that when the synthetic tunnel 23 b is formed, the removal range of the tunnel body and the ground improvement are improved. Range, tunnel width can be reduced.

  In the eighth embodiment, the upper chord material 105a and the upper chord material 105b have a structure like the connecting portion 19a shown in FIG. 4, but the structures of the upper chord material 105a and the upper chord material 105b are not limited thereto. The upper chord material 105a and the upper chord material 105b may have the same structure as other connecting portions as shown in FIGS.

  In the first, seventh, and eighth embodiments, when the main tunnel 1 and the lamp tunnel 3 are joined, in the first embodiment, the upper half connection portion 19a and the lower half connection portion 19b. In the seventh embodiment, the upper half connection portion 19k and the lower half connection portion 19l, and in the eighth embodiment, the upper half upper chord material 105a and the lower half upper chord material 105b. However, when the main tunnel 1 and the lamp tunnel 3 are joined, the upper half connection portion and the lower half connection portion may have different structures. For example, the upper half connection portion may have a structure as shown in FIG. 4, and the lower half connection portion may have another structure as shown in FIGS.

  Moreover, in 1st Embodiment, after removing the skin plate of the opposing segment 13 and excavating the ground 11 in the meantime, the remaining part of the segment 13 which removed the skin plate is removed, and the connection part 19 is installed. did. In 7th Embodiment, after removing the skin plate of the opposing segment 13 and excavating the ground 11 in the meantime, the connection part 19 was installed between the main girders of the segment 13 which removed the skin plate. In the eighth embodiment, after removing the skin plate of the opposing segment 13 and excavating the ground 11 therebetween, the remaining portion of the segment 13 from which the skin plate has been removed is removed and the upper chord material 105 is installed. A lower chord member 109 and a truss member 107 were installed between the main beams of the segment 13 from which the skin plate was removed. When joining the main tunnel 1 and the lamp tunnel 3, different joining methods may be used for the upper half and the lower half. For example, the upper half may be joined by the method of the first embodiment, and the lower half may be joined by the method of the seventh or eighth embodiment.

  As mentioned above, although preferred embodiment of the joining method of the tunnel concerning this invention was described referring an accompanying drawing, this invention is not limited to this example. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

The figure which shows each process for connecting the main line tunnel 1 and the lamp | ramp tunnel 3 and forming the synthetic | combination tunnel 23 View of synthetic tunnel 23 from above Perspective view of the vicinity of the connecting portion 19a Sectional view around the connection 19 Sectional view near the connecting portion 19c of another structure Sectional view near the connection portion 19d of another structure Sectional view near the connection part 19e of another structure Cross-sectional view of the connection portion 19f in the vicinity of the other structure and cross-sectional view of the piece 43 Sectional view around the connection part 19g of another structure Cross-sectional view near the connection portion 19h of another structure Cross-sectional view of the connection portion 19i of another structure and a perspective view of the variable segment 77 Sectional view near the connection part 19j of another structure Perspective view of the vicinity of the end of the segment 25 (segment 31) to which the steel plate of another shape is fixed The figure which shows each process for connecting the main tunnel 1 and the ramp tunnel 3 and forming the synthetic | combination tunnel 23a. Perspective view near the connection 19k Sectional view around the connection 19k Sectional view around the connection 19m in another structure The figure which shows each process for connecting the main tunnel 1 and the ramp tunnel 3 and forming the synthetic | combination tunnel 23b.

Explanation of symbols

1 ......... Main tunnel 3 ......... Ramp tunnel 9 ......... Ground improvement 11 ......... Ground 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h, 13i, 13j, 13k, 13l, 14a , 14b, 14c, 14d, 14e, 14f, 14g, 14h, 14i, 14j, 14k, 14l, 14m, 14n, 14o, 14p, 25, 31 ......... segments 17a, 17b, 17c, 17d, 17e, 17f, 17g, 17h, 17i, 17j, 17k, 17l, 17m, 17n ......... Excavation part 19, 19a, 19b, 19c, 19d, 19e, 19f, 19g, 19h, 19i, 19j, 19k, 19l, 19m ......... Connection part 23, 23a, 23b ......... Synthetic tunnel 27, 27a, 43, 43a, 57 ......... Frame material 29 ... H-shaped steel 33, 35, 45, 69, 83, 95, 97a ......... Joint plate 39 ... ... Axial reinforcement 41 ... ... Error absorbing plate 55, 55a, 75 ... ... Mortar 65, 67 ......... Hinge joint 71... Plate material 77... Variable segment 79... Outer member 81... Inner member 85, 87. 105b ......... Upper chord material 107a, 107b ......... Truss portion 109a, 109b ......... Lower chord material 109 ......... Concrete 115, 123, 125, 129 ......... Steel plate 117 ......... Reinforcing bars 119, 127, 133 ... … Hole 121, 131 ……… Notch

Claims (11)

Constructing a first tunnel and a second tunnel (a);
Among the opposing segments of the first tunnel and the second tunnel, the skin plate of a predetermined segment in the upper half or the lower half is removed, and the space between the first tunnel and the second tunnel is removed. A step (b) of excavating the ground of
Installing a connecting portion for connecting the first tunnel and the second tunnel (c);
A method for joining tunnels, comprising:   2. The tunnel according to claim 1, wherein in the step (c), all or a part of a remaining portion of the predetermined segment in the upper half or the lower half is removed and the connection portion is installed. Joining method. The connecting portion is
A frame material having one end fixed to the first tunnel;
A rod-shaped steel material having one end fixed to the top piece and the other end fixed to the second tunnel;
The tunnel junction method according to claim 1, comprising:   The tunnel joining method according to claim 3, wherein the piece is fixed to the first tunnel using a short bolt joint or a long bolt joint. The connecting portion is
The tunnel joining method according to claim 3, further comprising a hinge joint fixed between the piece material and the rod-shaped steel material. The connecting portion is
Two plate-like members having one end fixed to the first tunnel;
A rod-shaped steel material having one end fixed to the second tunnel and the other end disposed between the two plate-shaped members;
Mortar or concrete filled between the two plates,
The tunnel junction method according to claim 1, comprising: The connecting portion is
One end of the inner member is fixed to the first tunnel and one end of the outer member is fixed to the second tunnel;
The tunnel joining method according to claim 1, wherein the length of the variable segment can be adjusted by sliding the inner member with respect to the outer member. The connecting portion is
A rebar with one end disposed in a first segment constituting the first tunnel and the other end disposed within a second segment constituting the second tunnel;
A plate-like member fixed to the inner surface of the first segment and the second segment in parallel or perpendicular to the reinforcing bar;
Concrete installed around the rebar;
The tunnel junction method according to claim 1, comprising:   The tunnel joining method according to claim 8, wherein the plate member is provided with a hole through which the reinforcing bar passes.   The tunnel joining method according to claim 8, wherein the plate-like member is provided with a notch for improving the filling property of the concrete.   The tunnel joining method according to claim 1, further comprising a step (d) of installing a truss member on the inner peripheral side of the connection portion.

Images