Joint structure of reinforcement wall member, reinforcement wall member and wall structure

Abstract

To provide a joint structure of a reinforcement wall member, a reinforcement wall member and a wall structure capable of sufficiently playing the role as a substitute for a reinforcement ring.SOLUTION: A joint structure of a reinforcement wall member 1 is made by integrating a reinforcement member 2 and a wall member 3 provided on a natural ground side of the reinforcement member 2. The reinforcement wall member 1 includes a circumferential direction flange 32 and an axial direction flange 33. The reinforcement member 2 is a steel material including a web part 21 and a flange part 22, and is bolt-joined with the reinforcement member 2 of the reinforcement wall member 1 adjacent in the circumferential direction via a joint plate. At the axial direction flange 33, at least a pair of bolt passing holes 33a is formed at a position closer to the wall member 3 with a neutral axis N of the reinforcement wall member 1 being a reference and at a position which becomes substantially vertically symmetrical with the web part 21 of the reinforcement member 2 being an axis of symmetry, and is bolt-joined with the axial direction flange 33 of the reinforcement wall member 1 adjacent in the circumferential direction by utilizing the corresponding bolt passing hole 33a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention belongs to the technical field of joint structures of reinforcing wall members that can be used as a substitute for conventional reinforcing rings when constructing wall structures by joining wall-forming members (e.g., liner plates) circumferentially and axially, for example, as retaining walls used when constructing vertical shafts. [Background technology]

[0002] As described above, examples of wall-forming members that are joined together in the circumferential and axial directions to construct a wall structure include liner plates. In order to increase the strength of the liner plate, a reinforcing ring (H-shaped steel) is sometimes attached along the circumferential flange of the liner plate. Channel steel or angles have been used as the reinforcing ring as an alternative to the H-shaped steel, but in recent years segments (steel earth retaining panels) that are commonly used in tunnels and shafts have also been used (see, for example, Patent Documents 1 to 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-127952 [Patent Document 2] Japanese Patent Application Publication No. 2022-127961 [Patent Document 3] Japanese Patent Publication No. 2022-127984 [Patent Document 4] Japanese Patent Publication No. 2022-129843 Summary of the Invention [Problem to be solved by the invention]

[0004] When the segments according to Patent Documents 1 to 4 are used as substitutes for the reinforcing rings (H-shaped steel), the following problems arise. In other words, because the joints of the segments are pin-shaped, they generally have poorer bending moment transmission performance than rigid joints. For this reason, the wall structure is designed by multiplying the stiffness of the main body by a value called the spring value (a value indicating resistance to rotation) of the joints. For example, the strength of the joints (axial flanges) at the left and right ends of the segments is intentionally weakened by multiplying the strength of the main body by 0.6 or 0.3. Therefore, when the segments are used as steel retaining panels to construct wall structures, the joint positions of adjacent segments are arranged in a staggered pattern so that they are not aligned in a straight line in the axial direction, thereby compensating for the poor bending moment transmission performance of the joints. However, when the segment (steel retaining panel) is sandwiched between low-rigidity bodies (liner plates, etc.) from above and below, the joints (axial flanges) of the segments have a pin structure that has poor circumferential bending moment transmission performance, so the load is not transmitted sufficiently in the circumferential direction and stress is transmitted to the low-rigidity bodies connected above and below.As a result, even if a high-rigidity segment is used, the reinforcing effect of a reinforcing ring is not obtained, and there is a risk that the low-rigidity body will be burdened.

[0005] Therefore, the present invention has been devised in consideration of the problems of the background art described above, and its object is to provide a joint structure for a reinforcing wall member, a reinforcing wall member, and a wall structure that can fully ensure circumferential and axial load transmission performance (joint strength) by using a reinforcing wall member that has strength and yield strength equal to or greater than that of the wall-forming member (e.g., a liner plate) used in combination with the reinforcing wall member, and that can fully fulfill its role as a substitute for a reinforcing ring by devising the shape of the joint portion and the bolt joint position. [Means for solving the problem]

[0006] As a means for solving the problems of the background art, the joint structure of a reinforcing wall member according to the invention described in claim 1 is a joint structure of a reinforcing wall member formed by integrating a reinforcing member and a wall member provided on the natural ground side of the reinforcing member, the reinforcing wall member includes circumferential flanges provided along upper and lower edges of the wall member, and axial flanges provided along both circumferential end portions of the wall member; the reinforcing member is a steel member having a web portion and a flange portion, and is connected to the reinforcing member of the circumferentially adjacent reinforcing wall member by bolts via a joint plate; The axial flange is characterized in that at least a pair of bolt holes are formed in a position closer to the wall member with respect to the neutral axis of the reinforcing wall member and at positions that are approximately symmetrical above and below with the web portion of the reinforcing member as the axis of symmetry, and the axial flange of a circumferentially adjacent reinforcing wall member is bolted to the axial flange using the corresponding bolt holes.

[0007] The invention described in claim 2 is characterized in that, in the joint structure of the reinforcing wall member described in claim 1, the reinforcing member is an H-shaped steel or a steel material formed by integrating the web portions of two channel steels back to back, and a flange portion on one side is provided in the vertical center of the wall member, and bolt holes are formed at both circumferential ends of the flange portion on the other side.

[0008] The invention described in claim 3 is characterized in that, in the joint structure of the reinforcing wall member described in claim 1, the bolt-through holes formed in the axial flange are formed at least within the height range of the flange portion of the reinforcing member.

[0009] The joint structure of a reinforcing wall member according to the invention described in claim 4 is a joint structure of a reinforcing wall member formed by integrating a reinforcing member and a wall member provided on the natural ground side of the reinforcing member, the reinforcing wall member includes a circumferential flange provided along an upper end edge and a lower end edge of the wall member, and an axial flange provided along both circumferential end portions of the wall member, and the circumferential flange is reinforced so as to also serve as the reinforcing member; The axial flange has at least one pair of bolt holes formed in it, near the wall member relative to the neutral axis of the reinforcing wall member, and at positions that are approximately symmetrical in the vertical direction with a horizontal line equidistant from the upper and lower ends of the axial flange as the axis of symmetry, and the axial flange is bolted to the axial flange of a circumferentially adjacent reinforcing wall member using the corresponding bolt holes.

[0010] The reinforcing wall member according to the invention described in claim 5 is a reinforcing wall member used in the joint structure of the reinforcing wall member according to any one of claims 1 to 4, and is formed by integrating the reinforcing member with a wall member provided on the natural ground side of the reinforcing member, The wall member has circumferential flanges provided along upper and lower edges thereof, and axial flanges provided along both circumferential ends thereof, The circumferential flange is characterized in that a bolt-through hole is formed in the flange for joining the flange to the wall-forming member in the axial direction, and a bolt-through hole is formed in the flange for connecting the flange to the circumferentially adjacent reinforcing wall member so as to be able to transmit bending moments.

[0011] A wall structure according to the invention recited in claim 6 is constructed by joining the circumferential flange of the reinforcing wall member recited in claim 5 and a wall forming member in the axial direction. [Effects of the Invention]

[0012] The joint structure of a reinforcing wall member, the reinforcing wall member, and the wall structure according to the present invention have the following advantages. (1) It has strength and durability equivalent to or greater than that of conventional reinforcing rings or wall-forming members (e.g., liner plates), and by devising the shape of the joint and the bolt joint position based on structural mechanical characteristics, it is possible to sufficiently ensure the load transmission performance (joint strength) to the wall-forming members. In particular, the bending transmission performance of the joints of the axial flanges at both circumferential ends of the reinforcing wall member can be improved to a level equivalent to that of conventional reinforcing rings (H-shaped steel), so that the new product can adequately serve as a substitute for reinforcing rings in terms of structural mechanics. This in turn makes it possible to design with a uniform rigidity cross section as in the past (no need to consider the spring value of the joints in design). (2) When constructing a wall structure, if a reinforcing wall member is present alone between two wall-forming members (liner plates) with low rigidity, a joint structure can be realized that can transmit appropriate bending moments for both positive and negative bending. Specifically, positive bending can be transmitted by the bolt joint means of the flange portion (joint plate) on the front side of the reinforcing member (H-shaped steel), and negative bending can be transmitted by the bolt joint means of the axial flange. (3) When the reinforcing member constituting the reinforcing wall member is provided in the vertical center of the wall member, an axial flange (bolt joint) can be provided in the center, thereby realizing an efficient bending moment transmission structure in terms of structural design. Therefore, a wall structure constructed using the reinforcing wall members of the present invention can realize a wall structure that is structurally excellent and can fully ensure load transmission performance (joint strength) to the wall-forming members by using reinforcing wall members that have strength and yield strength equal to or greater than that of the wall-forming members (e.g., liner plates).

[0013] (4) Of course, this solves the safety issues that arise when using conventional reinforcing rings. In other words, since the joining work can be done only inside the tunnel, the difficult task of visually inspecting the work by workers is eliminated. It also eliminates the need to remove the temporarily fastened bolts, then reinstall them to fully tighten them. Furthermore, it is now possible to advance the excavation depth by the height of the reinforcing wall member during the joining work. [Brief explanation of the drawings]

[0014] [Figure 1]1A is a front view showing a reinforcing wall member according to Example 1, FIG. 1B is a cross-sectional view of A taken along line BB, FIG. 1C is a cross-sectional view of A taken along line CC, and FIG. 1D is a cross-sectional view of A taken along line DD. [Figure 2] 2A and 2B are explanatory views showing a stepwise process of butt-joining the reinforcing wall members shown in FIG. 1. [Figure 3] 2B, and FIG. 2B is a view taken along the line FF in FIG. 2B. [Figure 4] FIG. 3 is an elevational view showing a state in which wall-forming members (liner plates) are connected in a staggered arrangement to the top and bottom of the reinforcing wall members that have been butt-joined through the process of FIG. 2. [Figure 5] 5 is a schematic view showing a joint portion as viewed from the arrow GG in FIG. 4. [Figure 6] 1A is a front view showing a reinforcing wall member according to Example 2, B is an end view of A taken along line BB, C is an end view of A taken along line CC, and D is an end view of A taken along line DD. [Figure 7] 1A is a front view showing a reinforcing wall member according to Example 3, B is an end view of A taken along line BB, C is an end view of A taken along line CC, and D is an end view of A taken along line DD. [Figure 8] 1A is a front view showing a reinforcing wall member according to Example 4, FIG. 1B is an end view of A taken along line BB, FIG. 1C is an end view of A taken along line CC, and FIG. 1D is an end view of A taken along line DD. [Figure 9] 10A is a front view showing a reinforcing wall member according to Example 5, B is an end view of A taken along line BB, C is an end view of A taken along line CC, and D is an end view of A taken along line DD. [Figure 10] 10A is a front view showing a reinforcing wall member according to Example 6, B is an end view of A taken along line BB, C is an end view of A taken along line CC, and D is an end view of A taken along line DD. [Figure 11] 1A is a diagram showing a variation of the reinforcing wall member according to Example 1 (FIG. 1), and FIG. 1B is a diagram showing a variation of the reinforcing wall member according to Example 6 (FIG. 10). [Figure 12]10A is a front view showing a reinforcing wall member according to Example 7, B is an end view of A taken along line BB, C is an end view of A taken along line CC, and D is an end view of A taken along line DD. [Figure 13] 12A and 12B are views showing variations of the reinforcing wall member according to the seventh embodiment (FIG. 12). [Figure 14] 1 is an elevation view illustrating a main part of a vertical shaft constructed by axially joining a circumferential flange of a joint structure of a reinforcing wall member according to the present invention and a wall forming member (liner plate). FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Next, embodiments of the joint structure of a reinforcing wall member, the reinforcing wall member, and the wall structure according to the present invention will be described with reference to the drawings. For convenience of illustration, the reinforcing wall member 1 (reinforcing member 2, wall member 3) is shown as a straight steel member, but it should be noted that in reality, like the conventional reinforcing ring described above, it is often formed in an arc shape in plan view with a curvature that matches the wall-forming member (e.g., liner plate) used. In this specification, bending in which a force acts from the outside to the inside, causing tension in the inside, is referred to as "positive bending," and bending in which a force acts from the inside to the outside, causing tension in the outside, is referred to as "negative bending." [Example]

[0016] As shown in Figs. 1 to 5, the present invention provides a reinforcing wall member 1 formed by integrating a reinforcing member 2 with a wall member 3 provided on the natural ground side of the reinforcing member 2. The wall member 3 includes a circumferential flange 32 provided along the upper and lower edges thereof, and an axial flange 33 provided along both circumferential ends thereof. The circumferential flange 32 has a bolt through hole 32a for axially joining to a wall forming member (for example, a liner plate) 9, and the axial flange 33 has a bolt through hole 33a for connecting to a circumferentially adjacent reinforcing wall member 1 so as to be able to transmit bending moments. is formed. In this embodiment 1, the axial flange 33 is formed in a horizontally facing, approximately trapezoidal shape (a shape combining a trapezoid and a rectangle) that covers and conceals the upper and lower circumferential flanges 32 and the reinforcing member 2 when viewed from the side.

[0017] The reinforcing member 2 is implemented as a steel material having a web portion 21 and a flange portion 22, specifically an H-shaped steel 2 with the web portion 21 oriented horizontally and the flange portion 22 oriented vertically. Note that instead of the H-shaped steel 2, a steel material in which the web portions of two channel steels are integrated back-to-back can also be used. In this embodiment, the wall member 3 is made of steel material having a flat steel material 31 as the main body, the vertical dimension of which is about three times longer than the flange portion 22 of the reinforcing member (H-shaped steel) 2, the horizontal dimension of which is the same as that of the reinforcing member 2, and the thickness of which is thinner than that of the flange portion 22, and which is integrated with the circumferential flanges 32 and axial flanges 33 on the top, bottom, left, and right sides by joining means such as welding. 1 and other figures, the flange portion 22 on one side of the reinforcing member (H-shaped steel) 2 is placed against the vertical center of the flat steel material 31 of the wall member 3, and the flange portion 22 and the flat steel material 31 are integrated by joining means such as welding, thereby forming the reinforcing wall member 1, which is rectangular in front view. Bolt-through holes 22a are formed regularly (in the illustrated example, two rows, top and bottom, and two locations, left and right, for a total of four) at both circumferential ends of the flange portion 22 on the other side of the reinforcing member (H-shaped steel) 2. Incidentally, the reference numeral 4 in the figure denotes a stiffener (reinforcing rib) that approximates the shape of the axial flange 33.

[0018] 2A and 2B and 3A and 3B, the method of joining the reinforcing wall members 1 according to this Example 1 to adjacent reinforcing wall members 1 in the circumferential direction is as follows: adjacent flange portions 22 of the reinforcing members 2 (H-shaped steel 2) that are butted against each other are joined from the inside of the tunnel via (straddling) joint plates (also called attachment plates or splice plates) 8, bolts 6 are passed through bolt-through holes 22a provided in the flange portions 22, and the bolts are fastened with nuts 7. At the same time, the axial flanges 33 of the butted wall members 3 are fastened together from the inside of the tunnel, thereby butt-joining the reinforcing wall members 1 that are adjacent in the circumferential direction. This butt-joining operation is repeated in the circumferential direction, thereby constructing a closed cross-sectional structure of the required size. Thereafter, as shown in Figures 4 and 5, as in the prior art, the circumferential flanges 32 provided on the upper or lower edge of the reinforcing wall member 1 are used to connect it downward to the wall-forming member (liner plate in the illustrated example) 9, and the process of bolting from the inside of the tunnel (for example, in a staggered arrangement) is repeated to construct a wall structure of the desired shape, for example, a vertical shaft 10 to be used as an earth retaining wall as shown in Figure 14.

[0019] Here, the main features of this Example 1 (the present invention) will be explained. In this Example 1, when circumferentially adjacent reinforcing wall members 1 are connected to each other by bolt fastening means, a joint structure capable of transmitting an appropriate bending moment against positive bending is realized by bolting together the flange portions 22 of adjacent reinforcing members 2 via joint plates 8. At the same time, a joint structure capable of transmitting an appropriate bending moment against negative bending is realized by co-tightening the axial flanges 33 of the wall members 3 that are butted against each other. In particular, in this Example 1, the applicant has intensively investigated how to efficiently transmit bending moments from a structural mechanics perspective in response to the negative bending, and as a result, has devised, as shown in Fig. 1B, to provide at least one pair (two pairs, total of four in this Example) of bolt through holes 33a (i.e., bolt joints) of the axial flange 33 at a position closer to the wall member 3 (a position closer to the natural ground) with respect to the neutral axis N of the reinforcing wall member 1 as the reference, and at positions that are approximately symmetrical up and down with respect to the axis of symmetry of the web portion 21 of the reinforcing member 1. Furthermore, it has been devised that if at least one pair (two pairs, total of two in this Example) of bolt through holes 33a (i.e., bolt joints) is formed within the height range of the flange portion 22 of the reinforcing member 2, bending moments can be transmitted more efficiently and reliably. 1B, in this Example 1, four bolt holes 33a (bolt joints) are provided in a substantially linear pattern at positions near the wall member 3 (positions close to the natural ground) with respect to the neutral axis N of the reinforcing wall member 1, at positions that are substantially symmetrical up and down with the web portion 21 of the reinforcing member 1 as the axis of symmetry, and one pair of these (two upper and lower positions close to the web portion 21) is formed within the height range of the flange portion 22 of the reinforcing member 2. This makes it possible to efficiently transmit the bending moment against the negative bending related to the bending moment.

[0020] The reinforcing wall members 1 and the wall forming members 9 may be connected alternately in the vertical direction (see the lower structure in Figure 14), or the reinforcing wall members 1 or the wall forming members 9 may be connected together (see the upper structure in Figure 14), and the design can be modified as appropriate depending on the structural design. Furthermore, the position and number of stiffeners 4 provided in the reinforcing wall member 1 are not limited to the illustrated example and can be changed as appropriate depending on the structural design, and in some cases, it may be possible to implement without providing stiffeners 4. The position and number of bolt holes 22a, 33a, and 32a can also be changed as appropriate depending on the structural design. For example, as shown in a variation in FIG. 11A, in addition to the four bolt holes 33a, if a pair (two bolt holes) are formed within the height range of the flange portion 22 of the reinforcing member 2 at a position closer to the inside of the tunnel (a position farther from the natural ground) with respect to the neutral axis N of the reinforcing wall member 1, the bending moment can be transmitted more efficiently with respect to the positive bending related to the bending moment. The same technical idea applies to the embodiments described below.

[0021] Thus, the joint structure of the reinforcing wall member 1, the reinforcing wall member 1, and the wall structure according to the first embodiment provide the following effects. (1) It has strength and durability equivalent to or greater than that of a conventional reinforcing ring or wall-forming member (e.g., liner plate) 9, and by devising the shape of the joint and the bolt joint position based on structural mechanical characteristics, it is possible to sufficiently ensure the load transmission performance (joint strength) to the wall-forming member 9. In particular, the bending (negative bending) transmission performance of the joints of the axial flanges 33 at both circumferential ends of the reinforcing wall member 1 can be improved to a level equivalent to that of conventional reinforcing rings (H-shaped steel), so that the reinforcing wall member 1 can adequately serve as a substitute for reinforcing rings in terms of structural mechanics. Furthermore, it becomes possible to design the reinforcing wall member 1 with a uniform rigidity cross section (no need to design the joints taking into account the spring value). (2) When constructing a wall structure, if a reinforcing wall member 1 exists alone between two low-rigidity wall forming members (liner plates) 9, a joint structure can be realized that can transmit appropriate bending moments for both positive and negative bending. Specifically, positive bending can be transmitted by the bolt joint means of the flange portion 22 (joint plate 8) on the front side of the reinforcing member (H-shaped steel) 2, and negative bending can be transmitted by the bolt joint means of the axial flange 33. (3) When the reinforcing member 2 constituting the reinforcing wall member 1 is provided in the vertical center of the wall member 3, an axial flange 33 (bolt joint) is provided in the center, thereby realizing a structure that transmits bending moments efficiently in terms of structural design. Therefore, a wall structure constructed using the reinforcing wall member 1 of the present invention can realize a wall structure that is structurally excellent and can fully ensure load transmission performance (joint strength) to the wall forming member 9 by using a reinforcing wall member 1 that has strength and resistance equal to or greater than that of the wall forming member (e.g., liner plate) 9. (4) Of course, this solves the safety issues that arise when using conventional reinforcing rings. In other words, since the joining work can be performed only inside the tunnel, the difficult task of visually inspecting the work by workers is eliminated. It also eliminates the need to remove the temporarily fastened bolts and then reinstall them to fully tighten them. Furthermore, it is now possible to advance the excavation depth by the height of the reinforcing wall member 1 during the joining work. Therefore, a wall structure constructed using the reinforcing wall member 1 of Example 1 described above can realize a wall structure that is structurally excellent and can fully ensure load transmission performance (joint strength) to the wall forming member 9 by using a reinforcing wall member 1 that has strength and yield strength equal to or greater than that of the wall forming member (liner plate) 9. [Example]

[0022] FIG. 6 shows a reinforcing wall member 1 according to a second embodiment. The reinforcing wall member 1 according to this Example 2 differs from the reinforcing wall member 1 according to the above-described Example 1 in that the shapes of the axial flange 33 and the stiffeners 4 are formed into a vertically elongated rectangular shape that covers the upper and lower circumferential flanges 32 when viewed from the side. Since the other configurations are the same as those of the above-described Example 1, the same reference numerals are used and descriptions thereof will be omitted as appropriate.

[0023] That is, the reinforcing member 2 is still implemented as an H-shaped steel 2 with the web portion 21 oriented horizontally and the flange portion 22 oriented vertically. Furthermore, in this embodiment, the wall member 3, which is provided to extend in the vertical direction of the reinforcing member 2, has a vertical dimension that is about three times longer than the flange portion 22 of the reinforcing member (H-shaped steel) 2, a horizontal dimension that is the same as that of the reinforcing member 2, and a flat steel material 31 whose thickness is thinner than that of the flange portion 22, and which is made of steel material that is integrated on the top, bottom, left, and right sides with the circumferential flanges 32 and axial flanges 33 by joining means such as welding. There is no change in the positions and number of bolt holes 22a provided in the flange portion 22. Furthermore, only the shape of the axial flange 33 is different, and there is no change in the positions and number of bolt holes 33a (bolt joint portion).

[0024] Therefore, the method of joining the reinforcing wall members 1 according to Example 2 to circumferentially adjacent reinforcing wall members 1 is performed in the same manner as in Example 1. That is, referring to Figures 2A and 2B and Figures 3A and 3B, adjacent flange portions 22 of the reinforcing members 2 (H-shaped steel 2) that are butted together are joined from the inside of the tunnel by passing bolts 6 through bolt-through holes 22a provided in the flange portions 22 via joint plates 8 and fastening with nuts 7. At the same time, the axial flanges 33 of the butted wall members 3 are fastened together from the inside of the tunnel, thereby butt-joining the reinforcing wall members 1 that are circumferentially adjacent. This butt-joining operation is repeated in the circumferential direction, thereby constructing a closed cross-sectional structure of the required size. Thereafter, referring to Figures 4, 5 and 14, as in the prior art, the circumferential flanges 32 provided on the upper or lower edge of the reinforcing wall member 1 are used to connect it downward to the wall forming member (liner plate in the illustrated example) 9, and the process of connecting it with bolts from the inside of the tunnel (for example, in a staggered arrangement) is repeated to construct a wall structure (vertical shaft 10) of the desired shape.

[0025] Here, the main features of Example 2 will be explained. In Example 2, bolt holes 33a (bolt joints) are provided with the same concept (positions and numbers) as in Example 1 (see paragraph

[0019] above). Therefore, when connecting circumferentially adjacent reinforcing wall members 1 with bolt joint means, a joint structure capable of transmitting an appropriate bending moment is realized by bolting the flange portions 22 of adjacent reinforcing members 2 together via joint plates 8. At the same time, similar effects to those of Example 1 are achieved, such as realizing a joint structure capable of transmitting an appropriate bending moment by co-tightening the axial flanges 33 of the wall members 3 that are butted against each other against negative bending (see paragraph

[0021] above). [Example]

[0026] FIG. 7 shows a reinforcing wall member 1 according to a third embodiment. The reinforcing wall member 1 according to this Example 3 differs from the reinforcing wall member 1 according to Example 2 (Fig. 6) in that the axial flanges 33 are provided at three locations: two rectangular locations that cover the upper and lower circumferential flanges 32 when viewed from the side, and one square location that covers the reinforcing member 2 when viewed from the side, so as to make Fig. 7B easier to understand. The other configurations are the same as those of Example 2, so the same reference numerals are used and descriptions thereof will be omitted as appropriate.

[0027] That is, the reinforcing member 2 is still implemented as an H-shaped steel 2 with the web portion 21 oriented horizontally and the flange portion 22 oriented vertically. Furthermore, in this embodiment, the wall member 3, which is provided to extend in the vertical direction of the reinforcing member 2, has a vertical dimension that is about three times longer than the flange portion 22 of the reinforcing member (H-shaped steel) 2, a horizontal dimension that is the same as that of the reinforcing member 2, and a flat steel material 31 whose thickness is thinner than that of the flange portion 22, and which is made of steel material that is integrated on the top, bottom, left, and right sides with the circumferential flanges 32 and axial flanges 33 by joining means such as welding. There is also no change in the positions and number of bolt-through holes 22a provided in the flange portion 22. Furthermore, only the shape of the axial flange 33 is different, and the positions and number of bolt-through holes 33a (bolt joint portion) are also the same as in the first and second embodiments.

[0028] Therefore, the method of joining the reinforcing wall member 1 according to Example 3 to circumferentially adjacent reinforcing wall members 1 is performed in the same manner as in Examples 1 and 2. That is, referring to Figures 2A and 2B and Figures 3A and 3B, adjacent flange portions 22 of the reinforcing members 2 (H-shaped steel 2) that are butted together are joined from the inside of the tunnel by passing bolts 6 through bolt-through holes 22a provided in the flange portions 22 via joint plates 8 and fastening with nuts 7. At the same time, the axial flanges 33 of the butted wall members 3 are fastened together from the inside of the tunnel, thereby butt-joining the reinforcing wall members 1 that are circumferentially adjacent. This butt-joining operation is repeated in the circumferential direction, thereby constructing a closed cross-sectional structure of the required size. Thereafter, referring to Figures 4, 5 and 14, as in the prior art, the circumferential flanges 32 provided on the upper or lower edge of the reinforcing wall member 1 are used to connect it downward to the wall forming member (liner plate in the illustrated example) 9, and the process of connecting it with bolts from the inside of the tunnel (for example, in a staggered arrangement) is repeated to construct a wall structure (vertical shaft 10) of the desired shape.

[0029] Here, the main features of Example 3 will be explained. In Example 3, bolt holes 33a (bolt joints) are provided with the same concept (positions and numbers) as in Examples 1 and 2 (see paragraph

[0019] above). Therefore, when connecting circumferentially adjacent reinforcing wall members 1 with bolt joint means, a joint structure capable of transmitting an appropriate bending moment is realized by bolting the flange portions 22 of adjacent reinforcing members 2 together via joint plates 8. At the same time, similar effects to those of Example 1 are achieved, such as realizing a joint structure capable of transmitting an appropriate bending moment by co-tightening the axial flanges 33 of the wall members 3 that are butted against each other against negative bending (see paragraph

[0021] above). [Example]

[0030] FIG. 8 shows a reinforcing wall member 1 according to a fourth embodiment. The reinforcing wall member 1 according to this Example 4 differs from the reinforcing wall member 1 according to Example 3 (FIG. 7) in that the shape of the stiffeners 4 is formed in a horizontally facing approximately trapezoidal shape, similar to the stiffeners 4 of Example 1 (FIG. 1). Since the other configurations are the same as those of Example 3, the same reference numerals are used and the description thereof will be omitted as appropriate.

[0031] That is, Example 4 differs from Example 3 only in the shape of the stiffener, and not only the configuration of the axial flange 33 but also the position and number of the bolt-through holes 33a (bolt joints). Therefore, the method of joining the reinforcing wall member 1 according to Example 4 to the circumferentially adjacent reinforcing wall members 1 provides the bolt-through holes 33a (bolt joints) according to the same concept (position and number) as in Examples 1 to 3 (see paragraph

[0019] above). Therefore, when connecting the circumferentially adjacent reinforcing wall members 1 with bolt joint means, the flange portions 22 of the adjacent reinforcing members 2 are bolted together via the joint plate 8, thereby realizing a joint structure capable of transmitting an appropriate bending moment in the case of positive bending. At the same time, similar effects to those of Example 1 are achieved, such as realizing a joint structure capable of transmitting an appropriate bending moment in the case of negative bending by co-tightening the axial flanges 33 of the wall members 3 that are butted against each other (see paragraph

[0021] above). [Example]

[0032] FIG. 9 shows a reinforcing wall member 1 according to a fifth embodiment. The reinforcing wall member 1 according to this Example 5 differs from the reinforcing wall member 1 according to the above Example 1 (FIG. 1) in that a total of six bolt-through holes 22a are provided at both circumferential ends of the flange portion 22 of the reinforcing member (H-shaped steel) 2, with two upper and lower rows and three left and right rows. Since the other configurations are the same as those of the above Example 1, the same reference numerals are used and the description thereof will be omitted as appropriate.

[0033] That is, Example 5 differs from Example 1 only in the positions and number of bolt through holes 22a provided in the flange portion 22 of the reinforcing member 2, and the positions and number of bolt through holes 33a (bolted joints) are also the same as those of the axial flange 33. Therefore, the method of joining the reinforcing wall member 1 according to Example 5 to circumferentially adjacent reinforcing wall members 1 provides the bolt through holes 33a (bolted joints) with the same concept (positions and numbers) as in Examples 1 to 4 (see paragraph

[0019] above). Therefore, when connecting circumferentially adjacent reinforcing wall members 1 with bolt joint means, the flange portions 22 of adjacent reinforcing members 2 are bolted together via joint plates that are longer in the lateral direction than those in Examples 1 to 4, thereby realizing a joint structure that can transmit appropriate bending moments in the case of positive bending. At the same time, by fastening together the axial flanges 33 of the wall members 3 that are butted against each other, a joint structure that can transmit appropriate bending moments against negative bending is realized, thereby achieving the same effects as those of Example 1 above (see paragraph

[0021] above). In particular, according to the joint structure of the reinforcing wall member 1 of Example 5, as described above, the number of bolt holes 22a in the flange portion 22 of the reinforcing member (H-shaped steel) 2 is increased from four to six, thereby realizing a joint structure that can transmit bending moments more reliably for positive bending than Examples 1 to 4 above. [Example]

[0034] FIG. 10 shows a reinforcing wall member 1 according to a sixth embodiment. The reinforcing wall member 1 of Example 6 differs from the reinforcing wall member 1 of Example 1 (FIG. 1) in that the H-shaped steel 2 used as the reinforcing member 2 is enlarged, with the web portion 21 twice as long and the flange portion 22 1.5 times as high. Accordingly, the axial flange 33 and stiffener 4, which are formed in a substantially horizontal trapezoidal shape, are also enlarged. The positions and number of bolt-through holes 22a provided at both ends of the flange portion 22 are also different (see comparison of FIG. 1 and FIG. 10).

[0035] That is, the reinforcing member 2 is still implemented as an H-shaped steel 2 with the web portion 21 oriented horizontally and the flange portion 22 oriented vertically. The wall member 3 provided to extend in the vertical direction of the reinforcing member 2 is also of the same size as in Examples 1 to 5, but the height of the flange portion 22 of the reinforcing member (H-shaped steel) 2 used in this Example 6 is higher than in Examples 1 to 5, so the vertical dimension is about twice as long as the flange portion 22. The horizontal dimension is the same as that of the reinforcing member 2, and the main body is a flat steel material 31 whose plate thickness is thinner than the flange portion 22, and the above-mentioned circumferential flanges 32 and axial flanges 33 are attached to the top, bottom, left, and right sides of the main body by joining means such as welding. The positions and number of bolt holes 22a provided in the flange portion 22 of the reinforcing member 2 are increased (twice as many as eight) by increasing the height of the flange portion 22 compared to Example 1. Specifically, a total of eight bolt holes 22a are provided, four at each position (at the vertices of a parallelogram) that is symmetrical with respect to the web portion 21 of the reinforcing member 2 as the axis of symmetry. On the other hand, the axial flange 33 is also enlarged compared to the first embodiment, and thus has more bolt holes 33a (bolt joints) formed therein, as will be described below.

[0036] Although not shown in the drawings, the method for joining the reinforcing wall members 1 according to Example 6 to adjacent reinforcing wall members 1 in the circumferential direction is as follows: adjacent flange portions 22 of the abutted reinforcing members 2 (H-shaped steel 2) are joined from the inside of the tunnel by passing bolts 6 through bolt holes 22a provided in the flange portions 22 via joint plates 8 and fastening with nuts 7. At the same time, the axial flanges 33 of the abutted wall members 3 are fastened together from the inside of the tunnel, thereby butt-joining the reinforcing wall members 1 adjacent in the circumferential direction. This butt-joining operation is repeated in the circumferential direction, thereby constructing a closed cross-sectional structure of the required size. Thereafter, as in the prior art, the circumferential flanges 32 provided on the upper or lower edge of the reinforcing wall member 1 are used to connect it downward to the wall forming member (liner plate in the illustrated example) 9, and the process of bolting from the inside of the tunnel (for example, in a staggered arrangement) is repeated to construct a wall structure of the desired shape.

[0037] Here, the main features of Example 6 will be explained. In Example 6, when circumferentially adjacent reinforcing wall members 1 are connected by bolt fastening means, a joint structure capable of transmitting an appropriate bending moment is realized by bolting the flange portions 22 of adjacent reinforcing members 2 together via joint plates that are longer in the vertical and horizontal directions than those of Example 1. At the same time, a joint structure capable of transmitting an appropriate bending moment is realized by co-tightening the axial flanges 33 of the wall members 3 that are butted against each other against negative bending. In particular, according to the joint structure of the reinforcing wall member 1 of Example 6, as described above, the number of bolt-through holes 22a in the flange portion 22 of the reinforcing member (H-shaped steel) 2 is increased from four to eight, thereby realizing a joint structure that can transmit bending moments more reliably in positive bending than not only Examples 1 to 4 but also Example 5. For example, as shown in a variation in Figure 11B, in addition to the six bolt holes 33a, if two pairs (four holes) are formed within the height range of the flange portion 22 of the reinforcing member 2 at a position closer to the inside of the tunnel (a position farther from the ground) based on the neutral axis N of the reinforcing wall member 1, the bending moment can be transmitted more efficiently with respect to the positive bending related to the bending moment.

[0038] Furthermore, the applicant has intensively investigated how to efficiently transmit the bending moment from a structural mechanics perspective in response to the negative bending, and as a result, has devised, as shown in Fig. 10B, to provide at least one pair (three pairs, six in total in this embodiment) of bolt through holes 33a (bolt joints) in the axial flange 33 at a position closer to the wall member 3 (closer to the natural ground) with respect to the neutral axis N of the reinforcing wall member 1 as the reference, and at positions that are approximately symmetrical up and down with the web portion 21 of the reinforcing member 1 as the axis of symmetry. Furthermore, it has been devised that if at least one pair (two pairs, four in total in this embodiment) of the bolt through holes 33a (bolt joints) is formed within the height range of the flange portion 22 of the reinforcing member 2, the bending moment can be transmitted more efficiently and reliably. In consideration of these facts, in this Example 1, as shown in Fig. 10B, six bolt holes 33a (bolt joints) are provided in a substantially linear pattern at positions near the wall member 3 (positions close to the natural ground) with respect to the neutral axis N of the reinforcing wall member 1, at positions that are substantially symmetrical up and down with the web portion 21 of the reinforcing member 1 as the axis of symmetry, and two pairs of these (four upper and lower positions close to the web portion 21) are formed within the height range of the flange portion 22 of the reinforcing member 2. This provides effects equivalent to or greater than those of Example 1, such as being able to transmit the bending moment more reliably and efficiently than Examples 1 to 5 above with respect to the negative bending related to the bending moment. [Example]

[0039] FIG. 12 shows a reinforcing wall member 1 according to a seventh embodiment. The reinforcing wall member 1 according to Example 7 is characterized in that it does not use the reinforcing member (H-shaped steel) 2 used in Examples 1 to 6. More specifically, it is characterized in that the circumferential flange 32 according to Examples 1 to 6 is reinforced by increasing the plate thickness or the like (in the illustrated example, the plate thickness is doubled and the length (protruding dimension) is doubled), thereby implementing a structure in which the circumferential flange 32 can also be used as the reinforcing member 2.

[0040] That is, if the member (girder) that transmits the most stress among the reinforcing wall member 1 is defined as the main girder, the main girder of the reinforcing wall member 1 according to Examples 1 to 6 is the reinforcing member (H-shaped steel) 2 provided in its center, and by providing one or two pairs of bolt joints (bolt through holes 33a) as joints concentrated in the center within the height range of the flange portions 22 of the reinforcing member 2, a joint structure that can efficiently and satisfactorily transmit bending moments against negative bending is realized. At the same time, for positive bending, by bolting the flange portions 22 of adjacent reinforcing members 2 together via joint plates 8, it can be said that a joint structure that can transmit appropriate bending moments is realized. In contrast, the main girders of the reinforcing wall member 1 in Example 7 are the upper and lower ends of the reinforcing wall member 1, and the bolt joints (bolt holes 33a), which are the joint parts, are also located near the upper and lower ends, thereby realizing a joint structure that can efficiently transmit bending moments.

[0041] Specifically, the main girder of the reinforcing wall member 1 according to Example 7 is a reinforced circumferential flange 32 provided at the upper and lower ends thereof, and the bolt joints (bolt holes 33a) of the axial flange 33, which is the joint portion, are formed in at least one pair (two, upper and lower in the illustrated example) at positions closer to the wall member 3 with respect to the neutral axis N of the reinforcing wall member 1 as the reference and at positions that are substantially vertically symmetrical about a horizontal line equidistant from the upper and lower ends of the axial flange as the axis of symmetry, thereby realizing a joint structure that can efficiently and satisfactorily transmit bending moments against negative bending. At the same time, for positive bending, the bolt joints (two, upper and lower in the illustrated example) are formed in at least one pair (two, upper and lower in the illustrated example) at positions closer to the inside of the tunnel (a position farther from the natural ground) with respect to the neutral axis N of the reinforcing wall member 1 as the reference and at positions that are substantially vertically symmetrical about a horizontal line equidistant from the upper and lower ends of the axial flange 33 as the axis of symmetry, thereby realizing a joint structure that can efficiently and satisfactorily transmit bending moments against negative bending. Incidentally, the position and number of the bolt joints (bolt holes 33a) of the axial flange 33 can be appropriately changed depending on the structural design (see, for example, Figures 13A and 13B), but better transmission of bending moment can be achieved by locating them in the vicinity of the main girder (circumferential flange 32).

[0042] Although the embodiments have been described above based on the drawings, it should be noted that the present invention is not limited to the illustrated examples and includes the range of design modifications and application variations that would normally be made by a person skilled in the art, provided that they do not deviate from the technical concept of the present invention. For example, appropriate measures can be taken, such as providing a reinforcing plate to reinforce areas where the joint strength and rigidity are reduced. [Explanation of symbols]

[0043] 1 Reinforced wall member 2 Reinforcement members 21 Web Department 22 Flange 22a Bolt hole 3 Wall components 31 Flat steel material 32 Circumferential flange 32a Bolt hole center position 33 Axial flange 33a Bolt hole 4 stiffeners 6 volts 7 Nuts 8 Joint plate 9 Wall forming member (liner plate) 10 Shaft N Neutral axis

Claims

1. A joint structure of a reinforcing wall member formed by integrating a reinforcing member and a wall member provided on the natural ground side of the reinforcing member, the reinforcing wall member includes circumferential flanges provided along upper and lower edges of the wall member, and axial flanges provided along both circumferential end portions of the wall member; the reinforcing member is a steel member having a web portion and a flange portion, and is connected to the reinforcing member of the circumferentially adjacent reinforcing wall member by bolts via a joint plate; a reinforcing wall member joint structure, characterized in that at least a pair of bolt holes are formed in the axial flange at a position closer to the wall member with respect to the neutral axis of the reinforcing wall member and at positions that are approximately symmetrical above and below with respect to the web portion of the reinforcing member as an axis of symmetry, and the axial flange of a circumferentially adjacent reinforcing wall member is joined with a bolt using the corresponding bolt holes.

2. 2. The joint structure of a reinforcing wall member described in claim 1, wherein the reinforcing member is an H-shaped steel or a steel material formed by integrating the web portions of two channel steels back to back, and a flange portion on one side is provided in the vertical center of the wall member, and bolt holes are formed at both circumferential ends of the flange portion on the other side.

3. 2. The joint structure of a reinforcing wall member according to claim 1, wherein the bolt through-holes formed in the axial flange are formed at least within a height range of the flange portion of the reinforcing member.

4. A joint structure of a reinforcing wall member formed by integrating a reinforcing member and a wall member provided on the natural ground side of the reinforcing member, the reinforcing wall member includes a circumferential flange provided along an upper end edge and a lower end edge of the wall member, and an axial flange provided along both circumferential end portions of the wall member, and the circumferential flange is reinforced so as to also serve as the reinforcing member; a reinforcing wall member joint structure, characterized in that at least a pair of bolt holes are formed in the axial flange at a position closer to the wall member with respect to the neutral axis of the reinforcing wall member and at positions that are approximately symmetrical in the vertical direction with respect to a horizontal line equidistant from the upper and lower ends of the axial flange as an axis of symmetry, and the axial flange is bolted to the axial flange of a circumferentially adjacent reinforcing wall member using the corresponding bolt holes.

5. A reinforcing wall member used in the joint structure of the reinforcing wall member according to any one of claims 1 to 4, wherein the reinforcing wall member and a wall member provided on the natural ground side of the reinforcing wall member are integrated together; The wall member has circumferential flanges provided along upper and lower edges thereof, and axial flanges provided along both circumferential ends thereof, A reinforcing wall member characterized in that the circumferential flange has a bolt through hole formed therein for joining the circumferential flange to the wall forming member in the axial direction, and the axial flange has a bolt through hole formed therein for connecting the circumferential flange to an adjacent reinforcing wall member in a manner that allows bending moments to be transmitted.

6. A wall structure constructed by joining the circumferential flange of the reinforcing wall member according to claim 5 and a wall-forming member in the axial direction.

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