Support construction

Abstract

To provide a support structure capable of improving the workability and reducing the construction period by reducing the weight of members and simplifying the work in a tunnel.SOLUTION: The support structure for supporting an edge of a precast material constituting the internal structure built inside a tunnel on the inner side of the tunnel includes: an invert placed on the bottom of the tunnel; a support member that supports the weight of the precast material; and a side wall member placed on the inner surface of the tunnel. In the support member, one edge joins the edge of the invert and the other edge is joined to the side wall member, and the outer surface curves in an arc along the inner surface of the tunnel and is fixed on the inner surface of the tunnel by fixing means. On the upper surface of the side wall member, the edge of the precast material is placed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a support structure for supporting an internal structure constructed inside a tunnel. [Background technology]

[0002] A shield tunnel (hereinafter simply referred to as a tunnel) is formed by connecting segments (segment pieces) in the circumferential direction to construct an annular lining. Bulkheads are provided inside the tunnel to separate the interior space. Each space separated by the bulkheads is used for various purposes, and the space separated by horizontal bulkheads is used, for example, as a running path for vehicles or railways.

[0003] In recent years, in the construction of various structures, including tunnels, a technique has become commonplace in order to improve workability and shorten construction periods, using so-called precast concrete components (also simply called precast components) as concrete components. These components are prefabricated in factories, etc., and then transported to the site and assembled onto existing components.

[0004] For example, Patent Document 1 discloses a technique for constructing bulkheads in a shield tunnel using precast concrete vertical bulkhead blocks and horizontal bulkhead blocks. The technique disclosed in Patent Document 1 can reduce the number of work steps and improve work safety. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-44188 Summary of the Invention [Problem to be solved by the invention]

[0006] Shield tunnel construction is a method in which precast segments are assembled in parallel with excavation, and it is generally known that the excavation speed is equal to the construction speed. However, when constructing a tunnel's internal structure for vehicles or railways, the side walls (the deck support), which are part of the internal structure, are constructed with cast-in-place concrete after the segments are assembled, so the construction of the side walls could become an obstacle to construction.

[0007] Even if the bulkhead blocks themselves are made of precast concrete as described in Patent Document 1, the need to pour in-situ concrete inside the tunnel may lead to increased workload and longer construction times. Furthermore, from the standpoints of workability and safety, it is desirable to further simplify and streamline construction.

[0008] In view of the above circumstances, an object of the present invention is to provide a support structure that can reduce the weight of components and simplify work inside tunnels, thereby improving workability and shortening construction time. [Means for solving the problem]

[0009] In order to achieve the above object, according to the present invention, Lined with segments A support structure that supports the ends of precast members that constitute the internal structure constructed inside the tunnel on the inside sides of the tunnel, and is installed at the bottom of the tunnel. The upper surface is made of concrete that forms a flat surface. an invert, a support member that supports the weight of the precast member, and a support member installed on the inner surface of the tunnel Precast and a side wall member, one end of the support member being connected to the invert. Tunnel circumferential direction The other end is joined to the side wall member, and the outer surface thereof is bent in an arc shape along the inner surface of the tunnel and fixed to the inner surface of the tunnel by a fixing means. The sidewall members are constructed by arranging a plurality of arc-shaped H-shaped steel beams in the tunnel axis direction, and the sidewall members include members whose cross sections perpendicular to the tunnel axis direction are L-shaped with two sides and extend in the tunnel axis direction, one side of the L-shaped member extends in a substantially horizontal direction and its end is joined to the inner surface of the tunnel, its lower surface is supported by the other end of the support member, and the end of the precast member is installed on its upper surface, and the other side extends in a substantially vertical direction and its end is supported by a support metal fitting fixed on the support member. A support structure is provided, comprising: [Effects of the Invention]

[0012] According to the present invention, a support structure is provided that can reduce the weight of components and simplify work inside tunnels, thereby improving workability and shortening construction time. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic explanatory diagram showing the internal structure of a tunnel according to an embodiment of the present invention. [Figure 2] 1 is a schematic cross-sectional view of a support structure according to an embodiment of the present invention. [Figure 3] 1 is a schematic plan view of a support structure according to an embodiment of the present invention; [Figure 4] 1 is a schematic side view of a support structure according to an embodiment of the present invention; [Figure 5] 1 is a schematic side view of a support structure according to an embodiment of the present invention; [Figure 6] FIG. 10 is a schematic cross-sectional view of a support structure according to another embodiment of the present invention. [Figure 7] FIG. 4 is an explanatory diagram relating to the circumferential position of a segment. [Figure 8] FIG. 10 is a schematic plan view of a support structure according to another embodiment of the present invention. [Figure 9] FIG. 10 is a schematic side view of a support structure according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations may be omitted. In addition, in this specification, for the purpose of explanation, the configuration of the inside of concrete, etc., which is not normally visible, may be illustrated.

[0015] (Internal structure of the tunnel) 1 is a schematic explanatory diagram showing an internal structure 100 of a tunnel T according to an embodiment of the present invention. The internal structure 100 includes an annular tunnel lining 10 provided along the inner circumferential surface of the tunnel T, a deck 20 as an internal structure constructed inside the tunnel lining 10, and a support structure 30 that supports the deck 20 on the inside side of the tunnel T. The number and arrangement of the deck slabs 20 and the support structures 30 are arbitrary; for example, as shown in the figure, support structures 30 may be provided at two locations on the inside side of the tunnel T to support two deck slabs 20.

[0016] The tunnel lining 10 is composed of a plurality of arc-shaped segments 11 connected along the circumferential direction of the tunnel T. The segments 11 may be, for example, precast members fabricated in advance in a factory or the like.

[0017] An invert 40 is installed at the bottom of the tunnel lining 10 (below the interior of tunnel T). By installing the invert 40, a flat surface is formed at the bottom of tunnel T, and pillar members 50 are installed on this flat surface. The invert 40 and pillar members 50 can be manufactured by any method, and may be cast-in-place concrete members or precast members. The number and configuration of the pillar members 50 are also arbitrary, and for example, two pillar members may be installed at the bottom of the tunnel lining 10 as shown in the figure.

[0018] A support structure 30 is installed on the side of the tunnel lining 10. A deck 20 is suspended between the support structure 30 and the column members 50. The deck 20 may be a substantially flat precast member. By installing the deck 20, a substantially horizontal surface is formed inside the tunnel T. This substantially horizontal surface may be used as a roadbed, for example, a running path for vehicles or railways.

[0019] It is noted that the roadbed does not have to be constructed by the floor slabs 20, and the floor slabs 20 may be provided inside the tunnel lining 10 for another purpose. For example, the floor slabs 20 may be provided to divide the tunnel interior space defined by the tunnel lining 10 into an upper space for passing power cables and a lower space for passing communication cables.

[0020] (Support structure configuration) Next, a detailed configuration of the support structure 30 according to this embodiment will be described. Fig. 2 is a schematic cross-sectional view of the support structure 30. Here, Fig. 2 is an enlarged view of one portion (the shaded portion in Fig. 1) of the support structure 30 inside the tunnel T described above with reference to Fig. 1, including the vicinity thereof. Fig. 3 is a schematic plan view of the support structure 30. Figs. 4 and 5 are schematic side views of the support structure 30. Fig. 3 shows the AA cross section in Fig. 2, and Figs. 4 and 5 show the BB cross section and CC cross section in Fig. 2, respectively.

[0021] As shown in Figure 2, the support structure 30 includes a sidewall member 32 installed on the inner surface of the tunnel T, and a support member 34 that supports the weight of the sidewall member 32 and the deck slab 20. The sidewall member 32 has an L-shaped cross section perpendicular to the tunnel axis direction (Z direction in the figure) with two sides. The L-shape here means a shape in which the two sides extend in a substantially horizontal direction (X direction in the figure) and a substantially vertical direction (Y direction in the figure), as shown in the figure. The sidewall member 32 may be a precast member (a precast member) that is manufactured in advance in a factory or the like.

[0022] 2 to 5, the support member 34 extends so that one end 34a (lower end) is joined to the end of the inverter 40, and the other end 34b (upper end) is joined to the lower surface of the side wall member 32. The joining means at each of the ends 34a, 34b is arbitrary; for example, the end 34a may be joined by the weight of the support member 34 itself, and the end 34b may be joined by the weight of the side wall member 32 itself.

[0023] The support member 34 is mainly made up of, for example, an H-shaped steel beam, and its outer surface is bent in an arc along the inner surface of the tunnel T, and is fixed to the inner surface of the tunnel T by a fixing means 36. The fixing means 36 is optional, and may be, for example, a plurality of pre-installed inserts (threaded) 36a built into the segment 11 as shown in the figure, and corresponding screws or bolts (not shown). It is known that the segments 11 that make up a typical tunnel T are provided with a plurality of pre-installed inserts (threaded) 36a in advance, and these can be used as the fixing means 36.

[0024] In other words, one side of the L-shaped sidewall member 32 extends in a substantially horizontal direction (X direction), with its end joined to the inner surface of the tunnel T, and its lower surface supported by end 34b of the support member 34. The other side extends in a substantially vertical direction (Y direction), with its end supported by the support member 34 (support metal fitting 39, described later).

[0025] 2 and 5, the support member 34 may include channel steel 37 as an adjustment member at one end 34a and the other end 34b. The channel steel 37 is used to adjust for construction errors at the joint between the end 34a and the invert 40 and at the joint between the end 34b and the side wall member 32. The support member 34 may also include a liner plate 38 as a gap adjustment member at the joint with the invert 40.

[0026] 2 and 4, the support member 34 may include a support metal fitting 39 midway along its length that supports the lower end portion (the end portion of the side in the Y direction) of the L-shaped side wall member 32. The position of the support metal fitting 39 is designed as desired depending on the shape and dimensions of the side wall member 32. For example, the support metal fitting 39 is formed by welding a steel material that is perpendicular to the H-shaped steel that constitutes the support member 34 to form an integrated structure.

[0027] In other words, the support member 34 may be constructed integrally by joining together each component, with one or more H-shaped steel beams as the main components, which are bent in an arc shape along the inner surface of the tunnel T, and which also include channel steel beams 37 and support hardware 39 extending in a direction perpendicular to the H-shaped steel beams.

[0028] The various members of the support structure 30 described above with reference to Figures 2 to 5 can be joined together in various ways. For example, the side wall members 32 of the support structure 30 and the deck slab 20 may be joined by bolting. The support structure 30 and the invert 40 may be joined by any means. Specifically, they may be fixed by the weight of the support structure 30 itself or by bolting.

[0029] As described above with reference to Figures 2 to 5, the support structure 30 according to this embodiment is configured to include the side wall members 32, and the support members 34 and inverts 40 that support them. As shown in Figure 1, the support structures 30 are installed at two locations on both sides of the tunnel T. The deck slab 20 is supported by these support structures 30 and column members 50, and a substantially horizontal surface is formed inside the tunnel T. This substantially horizontal surface is used as a roadbed, for example, a running path for vehicles or railways.

[0030] (Action and effect) In the support structure 30 according to this embodiment, the side wall members 32 and the support members 34 are not made of cast-in-place concrete, but rather are members that do not require on-site concrete pouring. Furthermore, the side wall members 32 are precast members, and the support members 34 are members made primarily of steel (e.g., H-beams). Dividing the members into multiple members allows the members to be made smaller and lighter, simplifying the construction work.

[0031] Conventionally, pouring in-situ concrete has been a complex process, raising concerns about an increase in the number of steps, and posing problems in terms of workability and safety. However, the support structure 30 according to this embodiment minimizes concrete pouring, reducing the number of work steps, simplifying construction, and improving safety. In other words, compared to conventional methods, shorter construction periods and improved workability are realized.

[0032] Furthermore, the support structure 30 according to this embodiment is structured to support the deck slab 20 via inverts 40, and for example, as shown in Figure 1, the support structures 30 are provided at two locations on the inside sides of the tunnel T. In other words, the inverts 40 are subjected to approximately equal loads on the left and right, maintaining a state of mechanical equilibrium. This allows the deck slab 20 to be stably supported, improving the safety of the support structure 30.

[0033] Furthermore, in the support structure 30 according to this embodiment, channel steel 37 and liner plates 38 are provided to adjust for construction errors and gaps at the joints between members. This makes it possible to easily absorb construction errors during construction and to support the floor slabs 20 at the desired positions inside the tunnel T with high precision.

[0034] While one embodiment of the present invention has been described above, the present invention is not limited to the illustrated embodiment. It is clear that a person skilled in the art can conceive of various modifications and alterations within the scope of the ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

[0035] (Another embodiment of the present invention) In the above embodiment, the case where the support structure 30 includes the sidewall member 32 and the support member 34 has been described with reference to the drawings, but the scope of application of the present invention is not limited to this. For example, the support structure 30 may further include, in addition to the L-shaped sidewall member 32 described in the above embodiment, an arc-shaped sidewall member at the bottom, whose outer surface is bent in an arc along the inner surface of the tunnel T and is fixed to the inner surface of the tunnel T. Such a configuration will be described below as another embodiment of the present invention. Note that, below, components having the same functional configuration as those in the above embodiment will be assigned the same reference numerals, and their description may be omitted.

[0036] Fig. 6 is a schematic cross-sectional view of a support structure 30a according to another embodiment of the present invention. As shown in Fig. 6, the support structure 30a according to this embodiment further includes, at the lower part of the L-shaped sidewall member 32, an arc-shaped sidewall member 50 whose outer surface is bent in an arc shape along the inner surface of the tunnel T and is fixed to the inner surface of the tunnel T. One end 50a (lower end) of the arc-shaped sidewall member 50 is joined to the support member 34, and the other end 50b (upper end) is joined to the lower surface of the side 32a of the sidewall member 32, which extends in a substantially horizontal direction (X direction in the figure). In addition, the lower end of the side 32b of the sidewall member 32, which extends in a substantially vertical direction (Y direction in the figure), is also joined to the arc-shaped sidewall member 50. That is, the L-shaped side wall member 32 has both one side 32a and the other side 32b joined to the arc-shaped side wall member 50, and is supported by the support member 34 via the arc-shaped side wall member 50.

[0037] In addition, in the support structure 30a according to this embodiment, the arc-shaped side wall member 50 is fixed to the inner surface of the tunnel T by fixing means 52. The fixing means 52 is optional, and for example, a plurality of pre-installed inserts (threaded) 52a built into the segment 11 and corresponding screws or bolts (not shown) may be used.

[0038] Furthermore, the support member 34 is fixed to the inner surface of the tunnel T by a fixing means 55. The fixing means 55 is optional and may be, for example, one or more existing gripping hardware 55a built into the segment 11. Note that, as shown in FIGS. 7(a) and 7(b), due to the characteristics of the shield tunneling method, the circumferential position of the segment 11 may differ depending on the axial position of the tunnel T. Therefore, the position of the gripping hardware 55a built into the segment 11 may differ depending on the circumferential position of the segment 11. Therefore, in this embodiment, the gripping hardware 55a is shown by a solid line, and a gripping hardware 55b installed in a different position is shown by a dashed line.

[0039] 8 is a schematic plan view of the support structure 30a. FIG. 9 is a schematic side view of the support structure 30a. That is, FIG. 8 shows the AA cross section in FIG. 6, and FIG. 9 shows the BB cross section in FIG. 6. As shown in FIGS. 8 and 9, in the support structure 30a, for example, steel material perpendicular to the H-shaped steel that constitutes the support member 34 may be joined as gripping steel material 60 (60a, 60b). By fixing gripping hardware 55a, 55b to the gripping steel material 60, the support member 34 is fixed to the inner surface of the tunnel T.

[0040] According to the support structure 30a according to another embodiment of the present invention described above with reference to Figures 6 to 9, in addition to providing the same effects as those of the above-described embodiment, further miniaturization and weight reduction of components are achieved. Specifically, the support structure 30a is configured to include a plurality of sidewall members (L-shaped sidewall members 32 and arc-shaped sidewall members 50) and a support member 34. This further improves workability.

[0041] In addition, in the support structure 30a, a plurality of pre-installed inserts 52a built into the segments 11 are used as fixing means 52 to fix the arc-shaped side wall members 50 to the inner surface of the tunnel T, and at the same time, gripping hardware 55a, 55b built into the segments 11 are used as fixing means 55 to fix the support members 34 to the inner surface of the tunnel T. This allows for easy and reliable fixing of the members, further simplifying construction.

[0042] In the above embodiment and other embodiments, the deck slab 20 has been illustrated and described as an example of an internal structure constructed inside the tunnel T, but the scope of application of the present invention is not limited to this. Also, while the various fixing means have been illustrated and described as examples of existing inserts and gripping hardware built into the segments 11, the fixing means are not limited to this. For example, a joint member such as a fitting joint may also be used as the fixing means. [Industrial Applicability]

[0043] The present invention can be applied to a support structure that supports an internal structure constructed inside a tunnel. [Explanation of symbols]

[0044] 10...Tunnel lining 11...segments 20...Floorboard 30...Support structure 30a...Support structure (according to another embodiment) 32...Side wall member 34...Support member 36...Fixing means 36a...Existing insert 37…Channel steel 38...Liner plate 39...Support hardware 40...Invert 50...Column member 52...(in other embodiments) fixing means 52a...Existing insert 55...(in other embodiments) fixing means 55a, 55b...gripping hardware 60...Gripping steel material 100…Internal structure T...tunnel

Claims

[Claim 1] A support structure that supports the ends of precast members that constitute an internal structure constructed inside a tunnel lined with segments, on the inside sides of the tunnel, A concrete invert installed at the bottom of the tunnel, the upper surface of which forms a flat surface; a support member that supports the weight of the precast member; and precast sidewall members installed on the inner surface of the tunnel, The support member is configured by arranging a plurality of arc-shaped H-shaped steel beams in the tunnel axial direction, one end of which is joined to the end of the invert in the tunnel circumferential direction, the other end of which is joined to the side wall member, and the outer surface of which is bent in an arc shape along the inner surface of the tunnel and fixed to the inner surface of the tunnel by fixing means, The side wall member includes a member extending in the tunnel axial direction, the member having an L-shaped cross section perpendicular to the axial direction of the tunnel and consisting of two sides, A support structure characterized in that one side of the L-shaped member extends approximately horizontally and its end is joined to the inner surface of the tunnel, its lower surface is supported by the other end of the support member, the end of the precast member is installed on its upper surface, and the other side extends approximately vertically and its end is supported by a support hardware fixed on the support member.

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