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 that constitutes an internal structure built inside a tunnel on the inner side of the tunnel includes: an arc steel plate that is curved in an arc along the inner surface of the tunnel and is fixed to the inner surface of the tunnel by fixing means; and a support member that is provided to the surface facing the inside of the tunnel of the arc steel plate.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 an internal structure constructed inside a tunnel on the inside sides of the tunnel, and includes a circular steel plate that 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, and a support structure that is provided on the surface of the circular steel plate facing the inside of the tunnel. Steel a support member; The fixing means is configured using a plurality of existing inserts arranged in the circumferential and axial directions of the tunnel, the arc steel plate is fixed to the inner surface of the tunnel so as to cover a predetermined number or more of the existing inserts, the support member is configured by a plurality of rows of first steel support members and second steel support members spaced apart below them arranged in the axial direction of the tunnel, the first support members and the second support members are fixed to the arc steel plate so that their upper surfaces are approximately horizontal, The upper part is provided with a precast side wall member, and the side wall member is a member that extends in the tunnel axial direction and has an L-shape with two sides in cross section perpendicular to the axial direction of the tunnel, and is mounted on the multiple rows of support members, one side of the L-shape extends in an approximately horizontal direction, with its lower surface mounted on and supported by the upper surface of the first support member, and its upper surface is mounted on and supported by the end of the precast member, and the other side extends in an approximately vertical direction, with its lower end mounted on and supported by the upper surface of the second support member. A support structure is provided, comprising:

[0010] The one side of the L-shaped sidewall member extending in a substantially horizontal direction may have an end joined to the inner surface of the tunnel. [Effects of the Invention]

[0014] 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]

[0015] [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. 3 is a schematic cross-sectional view of a support structure according to a first alternative embodiment of the present invention. [Figure 7] FIG. 3 is a schematic plan view of a support structure according to a first alternative embodiment of the present invention. [Figure 8] FIG. 2 is a schematic side view of a support structure according to a first alternative embodiment of the present invention. [Figure 9] FIG. 2 is a schematic side view of a support structure according to a first alternative embodiment of the present invention. [Figure 10] FIG. 10 is a schematic cross-sectional view of a support structure according to a second alternative embodiment of the present invention. [Figure 11] FIG. 10 is a schematic plan view of a support structure according to a second alternative embodiment of the present invention. [Figure 12] FIG. 10 is a schematic side view of a support structure according to a second alternative embodiment of the present invention. [Figure 13] FIG. 10 is a schematic side view of a support structure according to a second alternative embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] 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.

[0017] (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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] (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 and CC cross sections in Fig. 2, respectively.

[0023] As shown in FIG. 2, the support structure 30 includes a circular steel plate 31 bent in an arc shape along the inner surface of the tunnel T, and the circular steel plate 31 is fixed to the inner surface of the tunnel T by a fixing means 33. The fixing means 33 is optional, and for example, as shown in FIGS. 2 and 5, a plurality of pre-installed inserts (threaded) 33a built into the segment 11 and corresponding screws or bolts (not shown) may be used. For example, the fixing means 33 may be realized by forming holes in the circular steel plate 31 at predetermined positions corresponding to the pre-installed inserts 33a and fastening the holes and pre-installed inserts 33a with screws or bolts. It is known that the segments 11 constituting a typical tunnel T are provided with a plurality of pre-installed inserts (threaded) 33a in advance, and these can be used as the fixing means 33.

[0024] The arc steel plate 31 is configured to cover a wide area of ​​the inner surface of the tunnel T (the inner surface of the segment 11). For example, the arc steel plate 31 may be configured to cover a predetermined number or more of the existing inserts 33a arranged in the circumferential and axial directions of the tunnel T. In other words, the arc steel plate 31 may be fixed to the inner surface of the tunnel T using the existing inserts 33a in the circumferential and axial directions of the tunnel T. The number and arrangement of the existing inserts 33a are determined by the cross-sectional size and position of the segment 11, insert specifications, etc., and the arc steel plate 31 may be designed based on this. In this embodiment, as shown in FIG. 5 , 18 existing inserts 33a are arranged in a 3 × 6 configuration for one segment 11. However, the number of existing inserts 33a may be, for example, 6 to 30.

[0025] Furthermore, support members 60 that support the ends of the floor panels 20 are provided on the inner surface of the arc steel plate 31 (the surface facing the inside of the tunnel T). As shown in Figures 2 and 5, the support members 60 may include a first support member 62 and a second support member 64 made of steel, each configured so that their upper surfaces are approximately horizontal. The first support member 62 is positioned higher than the second support member 64. Furthermore, a plurality of first support members 62 and second support members 64 may be provided, and for example, as shown in Figure 5, they may each be provided at a plurality of locations (two locations in the figure) in the width direction (Z direction) of a single arc steel plate 31.

[0026] The first support member 62 and the second support member 64 may be fixed to the arc steel plate 31. Any fixing method may be used, and for example, the first support member 62 and the second support member 64 may be fixed to the arc steel plate 31 by welding.

[0027] Additionally, a sidewall member 70 is provided on the upper portion of the support member 60. The sidewall member 70 has an L-shaped cross section perpendicular to the tunnel axis direction (Z direction in the drawing) consisting of two sides. Here, the L-shape is a shape in which the two sides extend in a substantially horizontal direction (X direction in the drawing) and a substantially vertical direction (Y direction in the drawing), as shown in the drawing. The end of the floor panel 20 is installed and mounted on the upper surface of one side 70a of the sidewall member 70, which extends in the substantially horizontal direction (X direction in the drawing). The sidewall member 70 may be a precast member (a precast member) manufactured in advance in a factory or the like.

[0028] In the L-shaped side wall member 70, one side 70a extending in a substantially horizontal direction (X direction in the drawing) has its end joined to the inner surface of the tunnel T, and its lower surface is supported by the first support member 62. In addition, the other side 70b extending in a substantially vertical direction (Y direction in the drawing) has its end supported by the second support member 64.

[0029] That is, the support structure 30 according to this embodiment comprises a circular arc steel plate 31, and a support member 60 including a first support member 62 and a second support member 64. A sidewall member 70 is provided on the top of the support member 60, and the end of the deck 20 is mounted on the upper surface of the sidewall member 70. That is, the weight of the deck 20 is supported by the support member 60 via the sidewall member 70.

[0030] 2 to 5, various methods can be used to join the various components of the support structure 30. For example, the sidewall member 70 of the support structure 30 may be joined to the deck slab 20 by bolting. Furthermore, the first support member 62 and the second support member 64 may or may not be joined to the sidewall member 70; specifically, they may be fixed by the weight of the support structure 30 itself, or by bolting.

[0031] As described above with reference to Figures 2 to 5, the support structure 30 includes the arc steel plate 31 and the support members 60 including the first support member 62 and the second support member 64, and is configured so that the support members 60 support the weight of the deck slab 20 via the side wall members 70. 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 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.

[0032] (Action and effect) The support structure 30 according to this embodiment is configured to fix the arc steel plates 31 over a wide area of ​​the segment 11 (the inner surface of the tunnel T). Furthermore, it is configured to support the sidewall member 70 at two or more locations using two members, the first support member 62 and the second support member 64. Therefore, the support member 60 including the first support member 62 and the second support member 64 can reliably support the weight of the deck slab 20 via the sidewall member 70. In other words, even if a vibration load is applied to the deck slab 20 during an earthquake, for example, the deck slab 20 can be stably supported.

[0033] Furthermore, in the support structure 30 according to this embodiment, each component, such as the arc steel plate 31, support member 60, and side wall member 70, is a component that does not require on-site concrete pouring. Specifically, the arc steel plate 31 is a steel plate, the support member 60 is a steel component, and the side wall member 70 is a precast component. By dividing the components into multiple components, the components can be made smaller and lighter, simplifying the construction work.

[0034] 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.

[0035] 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.

[0036] (Another embodiment of the present invention) In the above embodiment, a configuration in which the support structure 30 includes the arc steel plate 31, the support members 60 (first support member 62 and second support member 64), and the side wall member 70 has been described with reference to the drawings, but the scope of application of the present invention is not limited to this. In other words, the configuration of the support member 60 provided on the arc steel plate 31 is arbitrary, and members of various shapes and configurations can be used. 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.

[0037] (First Alternative Embodiment) Fig. 6 is a schematic cross-sectional view of a support structure 30a according to a first alternative embodiment of the present invention. Fig. 7 is a schematic plan view of the support structure 30a. Figs. 8 and 9 are schematic side views of the support structure 30a. Fig. 7 shows the AA cross section in Fig. 6, and Figs. 8 and 9 show the BB and CC cross sections in Fig. 6, respectively.

[0038] 6 to 9, in the support structure 30a according to this embodiment, a support member 80 is provided on the surface of the arc steel plate 31 facing the interior of the tunnel T. The support member 80 includes an H-shaped steel column 82 extending in a substantially vertical direction (Y direction in the drawings), and an H-shaped steel beam 84 extending in the axial direction of the tunnel T (Z direction in the drawings) above the H-shaped steel column 82 and disposed substantially horizontally. These H-shaped steel columns 82 and H-shaped steel beams 84 may be formed from H-shaped steel.

[0039] Furthermore, in the support member 80, the end of the floor plate 20 is mounted on the upper surface 84a of the H-shaped steel beam 84 (the upper surface of the flange in the case of an H-shaped steel beam). The arc steel plate 31 and the H-shaped steel column 82, the H-shaped steel column 82 and the H-shaped steel beam 84, and the upper surface 84a of the H-shaped steel beam 84 and the floor plate 20 may be joined by any method, and may be fixed by welding or bolting, for example.

[0040] According to the support structure 30a according to the first alternative embodiment of the present invention described with reference to Figures 6 to 9, in addition to enjoying the same effects as those of the above-described embodiment, further miniaturization and weight reduction of the members are achieved. Specifically, the support member 80 is configured to include H-shaped steel columns 82 and H-shaped steel beams 84, which are steel members. Because only steel members without concrete are used as the support member 80, further weight reduction of the members is achieved, and further improvement in workability is achieved.

[0041] (Second Alternative Embodiment) Fig. 10 is a schematic cross-sectional view of a support structure 30b according to a second alternative embodiment of the present invention. Fig. 11 is a schematic plan view of the support structure 30a. Figs. 12 and 13 are schematic side views of the support structure 30b. Fig. 11 shows the AA cross section in Fig. 10, and Figs. 12 and 13 show the BB and CC cross sections in Fig. 10, respectively.

[0042] As shown in Figures 10 to 13, in a support structure 30b according to this embodiment, a support member 90 is provided on the surface of the arc steel plate 31 facing the interior of the tunnel T. The support member 90 includes a steel rib member 92 arranged along a surface perpendicular to the axial direction of the tunnel T (the Z direction in the figures), and a steel protective plate 94 arranged approximately horizontally on top of the rib member 92. A plurality of rib members 92 may be arranged for one arc steel plate 31, and for example, as shown in Figures 11 to 13, they may be arranged in two locations on one arc steel plate 31. Both the rib member 92 and the protective plate 94 may be formed from steel plates.

[0043] Furthermore, in the support member 90, the end of the floor slab 20 is mounted on the upper surface of the protective plate 94. The arc steel plate 31 and the rib material 92, the rib material 92 and the protective plate 94, and the upper surface of the protective plate 94 and the floor slab 20 may be joined by any method, and may be fixed by welding or bolting, for example.

[0044] According to the support structure 30b according to the second alternative embodiment of the present invention described with reference to Figures 10 to 13, in addition to enjoying the same effects as those of the above-described embodiment, further miniaturization and weight reduction of the members are achieved. Specifically, the support member 90 is configured to include a rib member 92 and a protective plate 94 formed of steel plate. The support member 90 is configured using steel plate instead of concrete, thereby further reducing the weight of the member and improving workability.

[0045] 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 pre-installed inserts 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]

[0046] The present invention can be applied to a support structure that supports an internal structure constructed inside a tunnel. [Explanation of symbols]

[0047] 10...Tunnel lining 11...segments 20...Floorboard 30...Support structure 30a...Support structure (according to the first alternative embodiment) 30b...Support structure (according to the second alternative embodiment) 31...Circular steel plate 33...Fixing means 33a...Existing insert 40...Invert 50...Column member 60...Support member 62...first support member 64...Second support member 70...Side wall member 80...Support member (according to the first alternative embodiment) 82…H steel column 84…H steel beam 90...Support member (according to the second alternative embodiment) 92...Rib material 94...Protection plate 100…Internal structure T...tunnel

Claims

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 circular steel plate 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; a steel support member provided on a surface of the arc steel plate facing the inside of the tunnel; The fixing means is configured using a plurality of existing inserts arranged in the circumferential and axial directions of the tunnel, The arc steel plate is fixed to the inner surface of the tunnel so as to cover a predetermined number or more of the existing inserts, The support members are configured by arranging a plurality of rows of first steel support members and second steel support members spaced apart below the first steel support members in the tunnel axial direction, and the first support members and second support members are fixed to the arc steel plate so that their upper surfaces are approximately horizontal. a precast sidewall member provided on the top of the first support member and the second support member; The side wall member is a member whose cross section perpendicular to the axial direction of the tunnel is L-shaped consisting of two sides, extending in the direction of the tunnel axis, and is mounted on the multiple rows of support members, one side of the L-shape extending approximately horizontally, with its lower surface mounted and supported on the upper surface of the first support member, and its upper surface mounting and supporting the end of the precast member, and the other side extending approximately vertically, with its lower end mounted and supported on the upper surface of the second support member.

2. A support structure as described in Claim 1, characterized in that one side of the L-shaped side wall member extending approximately horizontally has its end joined to the inner surface of the tunnel.

Images