JP2017203323A - Reinforcing structure of tunnel and connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure of a tunnel which can easily construct an inner wall face while making it easily visual in the tunnel.SOLUTION: A reinforcing structure of a tunnel comprises a plurality of reinforcing panels (1) arranged along an inner face of the tunnel, and connectors (2) having bolts having round heads having reflection members, and nuts fastened to shafts of the bolts, and connecting the adjacent reinforcing panels. The connectors (2) have rotation prevention members which are arranged between the round heads of the bolts and the reinforcing panels, and prevent the co-rotation of the bolts caused by the fastening of the nuts while being engaged with the shafts of the bolts, and the round heads are arranged at the reinforcing panels (1) so as to face a light source which intrudes into the tunnel.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a tunnel reinforcing structure and a connector used for the tunnel reinforcing structure.

In order to prevent the concrete lining of an existing tunnel from aging and causing cracks and delamination, and falling of fragments and leakage of water, it is known that the tunnel surface is covered with a reinforcing panel. Backing material is filled between the surface of the tunnel and the reinforcing panel (see, for example, Patent Document 1).
In a tunnel where people and vehicles frequently come and go like a road tunnel, there are usually enough lighting fixtures to illuminate the interior. On the other hand, in tunnels where traffic of people and vehicles is small, such as small-scale tunnels and drainage tunnels, there is usually no lighting installed or lighting fixtures are not installed sufficiently. It may be difficult to fully recognize the inside of the tunnel only with the headlights of the approaching vehicle.
In view of this, for example, a reflecting member is provided on a hemispherical bolt head used for a guardrail beside a road so that the position of the guardrail can be recognized using reflected light from a vehicle headlight.

Japanese Patent No. 5308244

However, the hemispherical bolt head provided on the main surface of the guardrail is arranged in the lateral direction with respect to the extending direction of the road, and only the side head faces the light source of a vehicle or the like. The area of the reflecting surface of the reflecting member was small. Therefore, the amount of light reflected from the headlight of the moving vehicle to the bolt head and returning to the driver is small, and the viewing area is small.
When a nut is fastened to a bolt, it is necessary to press (fix) the head of the bolt using a tool such as a wrench in order to prevent the rotation of the bolt. However, the head of the round head bolt is hemispherical, and there are very few surfaces to be pressed by the tool, and it is difficult to press the round head bolt by the tool. Even if it can be pressed, the reflective surface may be damaged by the contact of the tool.

  Accordingly, the present invention has been made in view of the above problems, and provides a tunnel reinforcement structure that allows easy construction of an inner wall surface in a tunnel and allows easy construction, and a connector used for construction of this reinforcement structure. The purpose is to do.

  In order to achieve the above object, a tunnel reinforcing structure according to the present invention includes a plurality of reinforcing panels provided along the inner surface of the tunnel, a bolt having a round head provided with a reflecting member, and an axis of the bolt. And a connecting tool that connects adjacent reinforcing panels to each other, and the connecting tool is provided between the round head of the bolt and the reinforcing panel. An anti-rotation member that engages with a shaft portion to prevent the bolt from rotating due to fastening of the nut, and the round head is provided on the reinforcing panel so as to face a light source that has entered the tunnel. It is characterized by.

  Further, the shaft portion of the bolt is a protrusion provided at a connection portion between the screwed portion to which the nut is fastened and the head portion at least partially protruding radially outward from the outer periphery of the screwed portion. It is preferable that the anti-rotation member has a hole through which the threaded portion is inserted and accommodates the protruding portion, and the protruding portion and the hole have complementary shapes.

  Moreover, it is preferable that the said rotation prevention member has the said several hole along the extension direction.

  Moreover, it is preferable that the said rotation prevention member contacts the said reinforcement panel so that relative rotation is impossible.

  Moreover, it is preferable that the said rotation prevention member has an outer edge of the polygon in planar view which engages the tool used for the connection of the said reinforcement panel.

  Moreover, it is preferable that the said reinforcement panel is provided with the plate facing the inner surface of a tunnel, and the flange standingly arranged at the edge of the said plate, and the said connection tool is provided in the said flange.

  Further, it is preferable that a reflection member is provided on a surface of the rotation preventing member facing the inside of the tunnel.

  The nut is preferably a cap nut having a spherical cap having a reflecting member.

  The reflecting member is preferably a retroreflective coating.

  Moreover, it is preferable that the said connection tool is provided regularly along with the extension direction of a tunnel.

  In order to achieve the above object, the reinforcing panel connector according to the present invention is used for a reinforcing structure of the tunnel.

  ADVANTAGE OF THE INVENTION According to this invention, the reinforcement structure of the tunnel which can see an inner wall surface more easily in a tunnel can be constructed | assembled easily.

It is a perspective view which shows the reinforcement structure of a tunnel. (A) is a perspective view of a reinforcement panel, (b) is IIb-IIb sectional drawing of the reinforcement panel in (a). It is a perspective view which shows the reinforcement structure of the tunnel provided with the connection tool which has a reflection member. It is IV-IV sectional drawing in FIG. 3 of a coupling tool. (A) is a side view of a round head bolt, (b) is a bottom view of a round head bolt. (A) is a side view of a nut, (b) is a side view of another nut. (A) is a side view of a rotation preventing member, and (b) is a plan view of the rotation preventing member. It is sectional drawing which shows the modification 1 of a rotation prevention member. It is sectional drawing which shows the modification 2 of a rotation prevention member. (A) is sectional drawing which shows the modification 3 of a rotation prevention member, (b) is a top view of a square rotation prevention member, (c) is a top view of a hexagonal rotation prevention member. It is sectional drawing which shows the rotation prevention member which has a some hole, (a) is a top view of the rotation prevention member which has two holes, (b) is a top view of the rotation prevention member which has three holes. .

  A preferred embodiment of the present invention will be described with reference to the drawings. The embodiment described below is merely an example, and various forms can be taken within the scope of the present invention.

<Tunnel reinforcement structure>
FIG. 1 is a perspective view showing a reinforcing structure of a tunnel. Fig.2 (a) is a perspective view of a reinforcement panel, FIG.2 (b) is IIb-IIb sectional drawing in (a) of a reinforcement panel. FIG. 3 is a perspective view showing a reinforcing structure of a tunnel provided with a coupler having a reflecting member. FIG. 4 is a cross-sectional view of the coupling tool taken along line IV-IV in FIG. 3. Fig.5 (a) is a side view of a round head bolt, FIG.5 (b) is a bottom view of a round head bolt. Fig.6 (a) is a side view of a nut, FIG.6 (b) is a side view of another nut. FIG. 7A is a side view of the rotation preventing member, and FIG. 7B is a plan view of the rotation preventing member.

As shown in FIG. 1, a tunnel reinforcement structure 100 is obtained by covering the inner surface of an existing tunnel T with a reinforcement wall body that connects a plurality of reinforcement panels 1. This reinforcing structure 100 receives the concrete piece with the reinforcing panel 1 so that the concrete piece does not fall on the road when the concrete piece on the surface layer is peeled off from the inner surface of the tunnel T due to aging deterioration of the tunnel T, etc. Prevent the occurrence.
As shown in FIG. 1, the reinforcing structure 100 includes a plurality of reinforcing panels 1, a plurality of connectors 2 having a reflective member, another connector 3 (see FIG. 3) not having a reflective member, The insert 4 is included.

(Reinforcement panel)
As shown in FIG. 2, the reinforcing panel 1 is provided along the inner surface of the tunnel T. The reinforcing panel 1 includes a plate 11 facing the inner surface of the tunnel T, and flanges 12 and 13 erected on the edge of the plate 11.
The main surface of the plate 11 is disposed so as to face the inner surface of the tunnel T, and the concrete piece is received when the concrete piece collapses from the inner surface of the tunnel T. The plate 11 is formed in a rectangular shape in plan view. For example, the plate 11 is formed by curving a steel plate in a wave shape along the short side direction and in a circular arc shape along the longitudinal direction. Further, the plate 11 is not limited to be formed in a wave shape or an arc shape, and may be formed in a flat plate shape.

The flange 12 is provided at two edges on the longitudinal side of the plate 11 and is formed integrally with the plate 11 (hereinafter referred to as “longitudinal flange”). The longitudinal flange 12 is formed by bending the edge on the longitudinal side so as to be orthogonal to the main surface when the plate 11 is molded. The longitudinal flange 12 protrudes in a direction crossing the tunnel T when a plurality of reinforcing panels 1 are connected to form a reinforcing wall body.
The longitudinal flange 12 is not limited to being formed integrally with the plate 11 and may be joined to the plate 11 by welding similarly to the flange 13. Each longitudinal flange 12 is formed with a plurality of holes 12a through which the bolts of connectors 2 and 3 to be described later are inserted to connect adjacent reinforcing panels 1 to each other along the extending direction of the longitudinal flange 12. Yes.

The flange 13 is formed from a steel plate that can be joined to the plate 11 by welding, for example. The flange 13 is joined to two short edges of the plate 11 by welding and is erected with respect to the main surface of the plate 11 (hereinafter referred to as “short flange”). In each short flange 13, a plurality of holes 13 a are formed along the extending direction of the short flange 13 to connect the reinforcing panels 1 to be welded to each other and through which bolts of other connectors 3 described later are inserted. Has been.
Thus, in one reinforcing panel 1, one plate 11, two long flanges 12, and two short flanges 13 are provided. The longitudinal flanges 12 and the short flanges 13 of the adjacent reinforcing panels 1 are arranged so that the principal surface directions thereof are parallel to each other.

(Connector)
As shown in FIG.3 and FIG.4, the connection tool 2 is provided with a reflection member, and connects the adjacent reinforcement panels 1 mutually. Specifically, the connector 2 connects adjacent reinforcing panels 1 at the longitudinal flange 12. As shown in FIG. 3, a round head bolt 21 of the connector 2 described later is provided in every other row formed by connecting a plurality of reinforcing panels 1 in the circumferential direction of the tunnel T. It has been.
The connector 2 includes a round head bolt 21, a nut 24, a washer 25, and a rotation preventing member 26.

[Round head bolt]
As shown in FIGS. 4 and 5, the round head bolt 21 has a hemispherical head (hereinafter also referred to as “round head”) 22 and a shaft portion 23. The round head 22 faces the inside of the tunnel T and includes a reflecting member on the surface thereof. The reflective member is formed from a known reflective coating film.
The round head bolt 21 is oriented so that its axis extends along the extending direction of the tunnel T, and is inserted into the hole 12 a of the longitudinal flange 12. That is, the round head bolt 21 is attached to the longitudinal flange 12 of the reinforcing panel 1 so that the top of the round head 22 of the round head bolt 21 faces the light source of a vehicle or the like that has entered the tunnel T. Yes.
As the reflecting member, for example, a retroreflective member formed from a retroreflective coating film is preferably used. The retroreflective member is made of a material having a property of reflecting light incident from the outside in the same direction as the incident direction. The round head 22 provided with a retroreflective member has a self-reflective bead, which is a transparent bead having a reflective film formed on at least a part of its surface, and a transparent resin. The self-reflective beads are fixed with a transparent resin with a gap between them.

The shaft portion 23 includes a screwing portion 23a to which the nut 24 is screwed and fastened, and a protruding portion 23b accommodated in the hole 27a of the rotation preventing member 26. The screwing portion 23a is a portion where a screw thread is formed. In the connected state of the adjacent reinforcing panels 1, the threaded portion 23a is inserted into the hole 12a of the longitudinal flange 12 of the adjacent reinforcing panel 1, protrudes on the opposite side to the insertion side, and the nut 24 is screwed. It is concluded.
The protruding portion 23b is located at a connection portion between the round head portion 22 and the shaft portion 23, that is, between the round head portion 22 and the screwing portion 23a. As shown in FIG. 5B, the protruding portion 23b has an oval planar shape (outline) that protrudes at least partially outward in the radial direction from the outer periphery of the screwing portion 23a. As shown in FIG. 4, the protruding portion 23 b is accommodated in the hole 27 a of the rotation preventing member 26 in the connected state of the adjacent reinforcing panels 1. In this state, when the round head bolt 21 is to be rotated by fastening the nut 24, at least a part of the outer peripheral surface of the protruding portion 23b always comes into contact with the inner peripheral surface of the hole 27a of the rotation preventing member 26. The rotation of the head bolt 21 is prevented.

[nut]
As shown in FIG. 4, the nut 24 is fastened to the threaded portion 23 a of the round head bolt 21, and the reinforcing panels 1 are sandwiched between the adjacent longitudinal flanges 12 between the round head bolt 21 and the round head 22. Contribute to the consolidation of A known nut can be used as the nut 24. For example, a hexagonal nut 24 shown in FIG. 6A can be used. In addition to the hexagon nut 24, a cap nut 24A shown in FIG. 6B can be used. Cap (head) 24Aa of cap nut 24A faces the inside of tunnel T in a state of being fastened to screwing portion 23a, and is similar to round head 22 of round head bolt 21. A reflective member, particularly a retroreflective member, may be provided on the surface.
The cap nut 24A is fastened to the screwing portion 23a so that the top of the cap nut faces a light source such as a vehicle that has entered the tunnel T.

[Washer]
As shown in FIG. 4, a washer 25 is disposed between the nut 24 and the longitudinal flange 12 of the reinforcing panel 1. As the washer 25, a known round washer or the like can be used.

(Other connector)
As shown in FIG. 3, the adjacent reinforcing panels 1 other than the above-described connector 2 are connected to each other by another connector 3 including, for example, a known bolt and a nut screwed to the bolt. The bolt is inserted through the hole 12a of the long flange 12 and the hole 13a of the short flange 13 of both the reinforcing panels 1 to be connected, and a nut is fastened on the opposite side to the insertion side. In FIG. 3, since the inside of the tunnel T is obliquely viewed from one direction, only the head of the bolt is visible, and the nut is hidden behind the flanges 12 and 13.

(Rotation prevention member)
The rotation preventing member 26 is a plate-shaped member having an L-shaped cross section that prevents the round head bolt 21 from rotating together with the tightening (rotation) of the nut 24 when the nut 24 is fastened to the round head bolt 21. As shown in FIG. 7, the rotation preventing member 26 includes a long side portion 27 having a surface facing the extending direction of the tunnel T and a short side portion 28 having a surface parallel to the extending direction of the tunnel T. Have. The long side portion 27 is in contact with the longitudinal flange 12 of the reinforcing panel 1.

The long side portion 27 has a hole 27a through which the shaft portion 23 of the round head bolt 21, specifically, the screwing portion 23a and the protruding portion 23b are inserted. The shape of the hole 27a is oval in plan view. That is, the protrusion 23b and the hole 27a have a complementary shape. The hole 27a has a dimension for receiving the protruding portion 23b while the threaded portion 23a is inserted therethrough. When the protrusion 23b is accommodated in the hole 27a, there may be a slight gap between the inner peripheral surface of the hole 27a and the outer peripheral surface of the protrusion 23b. This interval allows slight rotation of the round head bolt 21 when the nut 24 is fastened, but does not allow the rotation of the projecting portion 23b, that is, the round head bolt 21.
The short side portion 28 is bent at a right angle from the long side portion 27 and extends parallel to the extending direction of the tunnel T. A reflective member may be provided on the surface of the long side portion 27 and the short side portion 28 facing the inside of the tunnel T, and it is particularly preferable that a retroreflective member is provided.

The arc-shaped transition portion 29 between the long side portion 27 and the short side portion 28 opposite to the surface of the anti-rotation member 26 facing the inside of the tunnel T has an edge facing the inside of the tunnel T of the long flange 12. In contact. Due to the contact between the reinforcing panel 1 and the rotation prevention member 26, the rotation of the rotation prevention member 26 itself is suppressed when the round head bolt 21 and the nut 24 are fastened. That is, the rotation preventing member 26 is in contact with the reinforcing panel 1 so as not to be relatively rotatable at the transition portion 29.
Even if the contact between the reinforcing panel 1 and the rotation prevention member 26 is insufficient, the rotation prevention member 26 rotates at least one edge of the short side portion 28 in the direction along the long flange 12. Is also prevented from contacting the longitudinal flange 12.

(Backing material)
As shown in FIG. 1, the backing material 4 includes an outer surface (plate 11) of a reinforcing wall body in which a plurality of reinforcing panels 1 are connected by a connector 2 and another connector 3, and an inner surface of a tunnel T. The gap formed between them is filled. The backing material 4 is made of, for example, mortar, and has a function of increasing the strength of the entire tunnel T by solidifying the reinforcing panel 1 and the tunnel T by solidifying. The backing material 4 is injected from an injection hole formed in advance in the plate 11 of the reinforcing panel 1.

<Construction of reinforcement structure>
As shown in FIGS. 1 and 3, when constructing the reinforcing structure 100 of the tunnel T, a plurality of reinforcing panels 1 are connected and covered along the circumferential direction on the inner wall surface of the existing tongue T. Adjacent reinforcing panels 1 connect the short flanges 13 to each other by other connecting tools 3. When the inner wall surface of the tunnel T is covered along the circumferential direction, the reinforcing panel 1 is then sequentially connected by the connector 2 and the other connector 3 along the extending direction of the tunnel T. Here, the reinforcing panels 1 are arranged so that the holes 12 a and 13 a of the flanges 12 and 13 are exposed in the tunnel T. Further, the adjacent reinforcing panels 1 are arranged in a staggered manner in such a manner that the short flanges 13 are not arranged side by side but are shifted in the circumferential direction of the tunnel T by about half the longitudinal length of the reinforcing panel 1. . When viewed in the direction in which the tunnel T extends, the longitudinal flanges 12 are arranged such that every other longitudinal flange 12 has the same height from the ground. As shown in FIG. 3, the reinforcing panels 1 are connected to each other by using a connector 2 in the longitudinal flanges 12 arranged so as to be lined up alternately.
To connect the reinforcing panels 1, first, the rotation preventing member 26 is installed on the longitudinal flange 12 of one reinforcing panel 1 to be connected, and then the round head bolt 21 is inserted into the hole 27 a of the rotation preventing member 26. In this state, the protrusion 23 b of the round head bolt 21 is located in the hole 27 a of the rotation prevention member 26. When the rotation preventing member 26 is installed, the hole 12a of the longitudinal flange 12 and the hole 27a of the rotation preventing member 26 are in communication with each other and ideally concentric with each other.
Next, a washer 25 is fitted into the screwed portion 23a of the round head bolt 21 protruding from the reinforcing panel 1 on the side opposite to the insertion side, and the nut 24 is fastened. When the nut 24 is tightened, the round head bolt 21 is partially in contact with the hole 27a of the rotation preventing member 26 at the protruding portion 23b, and the rotation preventing member 26 is in contact with the longitudinal flange 12 at the transition portion 29. Accordingly, the nuts 24 are fastened to the round head bolts 21 while preventing the round head bolts 21 from rotating, and the adjacent reinforcing panels 1 are connected to each other.

<Action, effect>
Due to the presence of the rotation preventing member 26, it is possible to prevent the round head bolt 21 from rotating when the nut 24 is fastened to the round head bolt 21. Accordingly, it is not necessary to fix the round head 22 of the round head bolt 21 provided with the reflecting member with a tool when the nut 24 is fastened, and the adjacent reinforcing panel 1 is simply tightened with the nut 24 without damaging the reflecting member. They can be linked together. Further, since the round head bolt 21 is provided in the longitudinal flange 12 so as to face the headlight of the vehicle that has entered the tunnel T, for example, the reflection surface that reflects the light emitted from the headlight is large, The visibility of reflected light can be improved.

  Further, when the reflecting member provided on the round head 22 is a retroreflective member, the light emitted from the headlight of the vehicle is reflected toward the passenger as reflected light when it hits the round head 22 of the round head bolt 21. . Thereby, the passenger can recognize that there is a reinforcing wall (wall surface) of the tunnel T at that position by visually recognizing the reflected light, and even in the tunnel T where the amount of light by illumination is not sufficient, The position of the reinforcing panel and the like can be easily recognized by the reflected light from the retroreflective member.

  Moreover, the shape of the protrusion part 23b and the hole 27a is complementary, and the outer peripheral surface of the protrusion part 23b at least partially contacts the inner peripheral surface of the hole 27a when the nut 24 is fastened. Thereby, the rotation with the nut 24 of the round head bolt 21 can be prevented. Furthermore, since the rotation preventing member 26 is in contact with the longitudinal flange 12 so as not to be relatively rotatable, it is not necessary to fix the rotation preventing member 26 itself with a tool or the like.

  Further, since the reflection member is provided on the surface of the rotation prevention member 26 facing the inside of the tunnel T, the light irradiated from the headlight of the vehicle travels toward the passenger as reflected light from the entire connector 2. Thus, the passenger can more reliably recognize the position of the reinforcing wall of the tunnel T.

  If the nut is configured as a cap nut 24A and the cap 24Aa is provided with a reflecting member, the light of the headlight of the vehicle traveling from the side facing the cap nut 24A in the tunnel T is reflected to the passenger. It can be returned as light. Accordingly, the reinforcing wall of the tunnel T can be surely visually recognized in any traveling lane in the tunnel T for face-to-face traffic.

<Others>
In addition, the shape of the protrusion part 23b may be other shapes, such as an ellipse and a polygon, for example. The shape of the hole 27a may be another shape such as an ellipse or a polygon, similarly to the shape of the protrusion 23b.
The installation place of the connector 2 is not limited to the long flange 12 and can be provided on the short flange 13. In addition, the direction of the round head 22 of the round head bolt 21 can be alternately directed in different directions along the extending direction of the longitudinal flange 12. In addition, the direction of the round head 22 of the round head bolt 21 can be changed for each row of the reinforcing panels 1 continuous in the extending direction of the tunnel T.
It should be noted that the round head bolts 21 of the connector 2 are not only arranged in every other row of the reinforcing panels 1 but also arranged in every row of the reinforcing panels 1. You may form in the row | line | column of the reinforcement panel 1 which put every two or more.

<Modification 1>
Next, Modification 1 of the rotation preventing member will be described. In addition, about the same structure as the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. FIG. 8 is a cross-sectional view showing a first modification of the rotation preventing member.
The anti-rotation member 26A in the connector 2A according to Modification 1 is formed in an L-shaped cross section like the anti-rotation member 26, and has a long side portion 27A and a short side portion 28A. The rotation prevention member 26A has a contact portion 27Ab that contacts the plate 11 at the long side portion 27A. Specifically, the contact portion 27Ab contacts a transition portion between the plate 11 and the longitudinal flange 12 of the reinforcing panel 1 to prevent the rotation preventing member 26A from rotating relative to the reinforcing panel 1.
Also in the modified example 1, at least the same operation and effect as the above-described embodiment can be obtained.

<Modification 2>
Next, Modification 2 of the rotation preventing member will be described. In addition, about the same structure as the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. FIG. 9 is a sectional view showing a second modification of the rotation preventing member.
The rotation preventing member 26B in the connector 2B according to the modification 2 is a flat plate member. The rotation preventing member 26 </ b> B has a contact portion 26 </ b> Ba that contacts the plate 11 of the reinforcing panel 1 at the edge opposite to the side facing the tunnel T. Specifically, the contact portion 26Ba contacts a transition portion between the plate 11 and the longitudinal flange 12 of the reinforcing panel 1 to prevent relative rotation of the rotation preventing member 26B with respect to the reinforcing panel 1.
Also in the modified example 2, at least the same operation and effect as the above-described embodiment can be obtained.

<Modification 3>
Next, Modification 3 of the rotation preventing member will be described. In addition, about the same structure as the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. 10A is a cross-sectional view showing a third modification of the rotation preventing member, FIG. 10B is a plan view of the rotation preventing member having a square shape in plan view, and FIG. 10C is a hexagonal shape in plan view. It is a top view of a rotation prevention member.
Unlike the embodiment and the first and second modifications, the rotation preventing member 26C in the connector 2C according to the third modification is fixed in position using a tool such as a wrench when the nut 24 is fastened to the round head bolt 21. By doing so, relative rotation with respect to the reinforcing panel 1 is impossible. The rotation prevention member 26C has a polygonal outer edge in plan view. The tool is at least partially engaged with the outer edge to prevent relative rotation of the anti-rotation member 26 </ b> C with respect to the reinforcing panel 1 by fastening the nut 24. The shape of the rotation preventing member 26C may be, for example, a square rotation preventing member 26Ca as shown in FIG. 10 (b) or a hexagonal rotation preventing member 26Cb as shown in FIG. 10 (c).
Also in the modified example 3, at least the same actions and effects as the above-described embodiment can be obtained.
Further, since the tool engages with the rotation preventing member 26C to fix the position of the rotation preventing member 26C, the round head 22 (reflection member) of the round head bolt 21 is not damaged.

<Modification 4>
Next, Modification 4 of the rotation preventing member will be described. In addition, about the same structure as the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. 11 is a cross-sectional view showing a rotation preventing member D having a plurality of holes, FIG. 11 (a) is a plan view of the rotation preventing member having two holes, and FIG. 11 (b) has three holes. It is a top view of a rotation prevention member.
Unlike the embodiment and the first to third modifications, the rotation prevention member 26D in the connector according to the fourth modification is formed by forming a plurality of rotation prevention members as one member, and the longitudinal direction of the longitudinal flange 12 And has a plurality of holes 27Da through which the round head bolts 21 are inserted along the extending direction. The distance between the hole 27Da and the hole 27Da coincides with the distance between the adjacent holes 12a of the longitudinal flange 12. Here, the “interval” is a distance between the axial centers of the adjacent holes 12a: 27a. The number of holes 27a may be two, for example, as shown in FIG. 11 (a) or three as shown in FIG. 11 (b), and the same number as the holes 12a of the longitudinal flange 12 There may be.
Similarly to the second modification, the rotation preventing member 26D comes into contact with the reinforcing panel 1 at the edge opposite to the side facing the tunnel T, so that it cannot rotate relative to the reinforcing panel 1.
The rotation preventing member 26D may be formed in an L-shaped cross section.
Also in the modified example 4, at least the same operation and effect as the above-described embodiment can be achieved.
With the above-described configuration, it is only necessary to provide one anti-rotation member 26D for each of the plurality of holes 12a as compared to the connection work using the individual anti-rotation members for the individual holes 12a of the longitudinal flange 12. Therefore, the work burden can be further reduced.

DESCRIPTION OF SYMBOLS 1 Reinforcement panel 2 Connecting tool 3 Other connecting tools 11 Plate 12, 13 Flange 12a, 13a Hole 21 Round head bolt 22 Round head 23 Shaft part 23a Screw part 23b Protruding part 24 Nut 24A Cap nut 24Aa Cap 26, 26A, 26B, 26C, 26D Anti-rotation member 27a, 27Da Hole 100 Tunnel reinforcing structure T Tunnel

Claims (11)

A plurality of reinforcing panels provided along the inner surface of the tunnel;
A bolt having a round head provided with a reflecting member, and a nut fastened to a shaft portion of the bolt, and connecting the adjacent reinforcing panels to each other;
With
The connector has an anti-rotation member that is provided between the round head of the bolt and the reinforcing panel, and that prevents the rotation of the bolt by fastening the nut by engaging the shaft of the bolt. And
The said round head is provided in the said reinforcement panel so as to oppose the light source which entered the said tunnel. The reinforcement structure of the tunnel characterized by the above-mentioned. A shaft portion of the bolt is a protruding portion provided at a connecting portion between the screwed portion to which the nut is fastened and the round head at least partially protruding radially outward from the outer periphery of the screwed portion. And having
The rotation preventing member has a hole through which the screwing portion is inserted and which accommodates the protruding portion,
The tunnel reinforcing structure according to claim 1, wherein the protrusion and the hole have a complementary shape.   The tunnel reinforcement structure according to claim 2, wherein the rotation preventing member has a plurality of the holes along an extending direction.   4. The tunnel reinforcement structure according to claim 1, wherein the rotation prevention member contacts the reinforcement panel so as not to be relatively rotatable. 5.   4. The tunnel reinforcement structure according to claim 1, wherein the rotation prevention member has a polygonal outer edge in plan view that engages with a tool used to connect the reinforcement panels. 5. The reinforcing panel includes a plate facing the inner surface of the tunnel, and a flange erected on the edge of the plate,
The tunnel reinforcing structure according to any one of claims 1 to 5, wherein the connector is provided on the flange.   The reinforcing structure of a tunnel according to any one of claims 1 to 6, wherein a reflection member is provided on a surface of the rotation preventing member facing the inside of the tunnel.   The tunnel reinforcing structure according to any one of claims 1 to 7, wherein the nut is a cap nut having a spherical cap having a reflecting member.   The tunnel reinforcing structure according to any one of claims 1 to 8, wherein the reflecting member is a retroreflective coating film.   The reinforcing structure for a tunnel according to any one of claims 1 to 9, wherein the connecting members are regularly arranged along the extending direction of the tunnel.   The connection tool of the reinforcement panel used for the reinforcement structure of the tunnel as described in any one of Claim 1-10.