JP6723066B2 - Reinforcement structure of tunnel and connecting tool - Google Patents

Description

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

It is known that the surface of the tunnel is covered with a reinforcement panel in order to prevent the concrete lining of the existing tunnel from aging and cracking or peeling, resulting in falling debris or leaking water. A backfill material is filled between the surface of the tunnel and the reinforcing panel (see, for example, Patent Document 1).
In a tunnel such as a road tunnel where people and vehicles frequently come and go, a lighting device for illuminating the inside is usually installed sufficiently. On the other hand, in tunnels such as small-scale tunnels and drainage tunnels where traffic of people and vehicles is small, lighting is usually not installed, or sufficient lighting equipment is not installed in the tunnel. It was sometimes difficult to fully recognize the inside of the tunnel only with the headlights of the entering vehicle.
Therefore, for example, there is one in which a reflecting member is provided on the head portion of a hemispherical bolt used for a guardrail beside a road so that the position of the guardrail can be recognized by using the reflected light from the headlight of the vehicle.

Patent No. 5308244

However, the hemispherical bolt head provided on the main surface of the guardrail is arranged laterally with respect to the extending direction of the road, and the head is only facing the light source of the vehicle or the like. The area of the reflecting surface of the reflecting member was small. Therefore, the amount of light reflected from the headlights of a moving vehicle to the head of the bolt and returning to the driver is small, and the visible area is small.
When fastening a nut to a bolt, it is necessary to hold (fix) the head of the bolt with a tool such as a wrench in order to prevent the bolt from rotating around. However, the head of the round head bolt is hemispherical, and the surface pressed by the tool is extremely small, 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.

Therefore, the present invention has been made in view of the above-mentioned problems, and provides a reinforcing structure of a tunnel in which the inner wall surface is easily visible in the tunnel and can be easily constructed, and a connector used for constructing the reinforcing structure. The purpose is to do.

In order to achieve the above object, a reinforcing structure for a tunnel according to the present invention includes a plurality of reinforcing panels provided along an inner surface of the tunnel, a bolt having a round head provided with a reflecting member, and a shaft of the bolt. A connecting member for connecting adjacent reinforcing panels to each other, the connecting member being provided between the round head of the bolt and the reinforcing panel, There is a rotation preventing member that engages with a shaft portion and prevents rotation of the bolt 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

In addition, the shaft portion of the bolt is provided with a threaded portion to which the nut is fastened, and a projection provided at a connection portion with the head portion that at least partially projects radially outward from the outer periphery of the threaded portion. It is preferable that the rotation preventing member has a hole through which the screwing portion is inserted and accommodates the protruding portion, and the protruding portion and the hole have complementary shapes.

Further, it is preferable that the rotation preventing member has a plurality of the holes along the extending direction.

Further, it is preferable that the anti-rotation member is in contact with the reinforcing panel so as not to be relatively rotatable.

Further, it is preferable that the rotation prevention member has a polygonal outer edge that engages with a tool used for connecting the reinforcing panels.

Further, it is preferable that the reinforcing panel includes a plate facing an inner surface of the tunnel, and a flange erected on an edge of the plate, and the connector is provided on the 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.

Further, it is preferable that the nut is a cap nut having a spherical cap having a reflecting member.

Further, the reflecting member is preferably a retroreflective coating film.

Further, it is preferable that the connecting tools are arranged regularly along the extending direction of the tunnel.

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

According to the present invention, it is possible to easily construct a reinforcing structure of a tunnel in which the inner wall surface is more visible in the tunnel.

It is a perspective view which shows the reinforcement structure of a tunnel. (A) is a perspective view of a reinforcement panel, (b) is a IIb-IIb sectional view 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. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3 of the connector. (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 an example, and various forms can be taken within the scope of the present invention.

<Reinforcement structure of tunnel>
FIG. 1 is a perspective view showing a reinforcing structure of a tunnel. 2A is a perspective view of the reinforcing panel, and FIG. 2B is a sectional view taken along line IIb-IIb in FIG. 2A of the reinforcing panel. FIG. 3 is a perspective view showing a reinforcing structure of a tunnel including a connecting tool having a reflecting member. FIG. 4 is a cross-sectional view of the connecting tool taken along the line IV-IV in FIG. 3. FIG. 5A is a side view of the round head bolt, and FIG. 5B is a bottom view of the round head bolt. FIG. 6A is a side view of the nut, and FIG. 6B is a side view of another nut. 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 reinforcing structure 100 for a tunnel is obtained by covering the inner surface of an existing tunnel T with a reinforcing wall body that connects a plurality of reinforcing panels 1. The reinforcing structure 100 receives the concrete piece with the reinforcing panel 1 so that the concrete piece of the surface layer does not fall onto the road when the concrete piece of the surface layer is peeled off from the inner surface of the tunnel T due to aging of the tunnel T or the like. Prevent occurrence.
As shown in FIG. 1, the reinforcing structure 100 includes a plurality of reinforcing panels 1, a plurality of connecting members 2 having a reflecting member, another connecting member 3 having no reflecting member (see FIG. 3), And the insert material 4.

(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 provided upright on the edge of the plate 11.
The plate 11 is arranged such that its main surface faces the inner surface of the tunnel T and receives the concrete piece when the concrete piece collapses from the inner surface of the tunnel T. The plate 11 is formed in a rectangular shape in a plan view, and is formed by, for example, curving a steel plate in a wave shape along its lateral direction and curving it in an arc shape along its longitudinal direction. Further, the plate 11 is not limited to being formed by curving in a wave shape or an arc shape, and may be formed in a flat plate shape.

The flanges 12 are provided on the two longitudinal edges of the plate 11 and are integrally formed with the plate 11 (hereinafter referred to as “longitudinal flange”). The longitudinal flange 12 is formed by bending the edge portion on the longitudinal side so as to be orthogonal to the main surface when the plate 11 is molded. The longitudinal flange 12 projects in a direction traversing 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 integrally formed with the plate 11, and may be joined to the plate 11 by welding similarly to the flange 13. In each of the longitudinal flanges 12, a plurality of holes 12a for connecting the adjacent reinforcing panels 1 to each other are formed along the extending direction of the longitudinal flanges 12 and through which bolts of connecting tools 2 and 3 to be described later are inserted. There is.

The flange 13 is formed of, for example, a steel plate that can be joined to the plate 11 by welding. The flange 13 is joined to the two edge portions on the short side of the plate 11 by welding and is erected on the main surface of the plate 11 (hereinafter, referred to as “short side flange”). In each short flange 13, a plurality of holes 13a for connecting the reinforcing panels 1 to be welded to each other and through which bolts of another connecting tool 3 described later are inserted are formed along the extending direction of the short flange 13. Has been done.
Thus, in one reinforcement panel 1, one plate 11, two long flanges 12 and two short flanges 13 are provided. The long flanges 12 and the short flanges 13 of the adjacent reinforcing panels 1 are arranged so that their principal surface directions are parallel to each other.

(Connector)
As shown in FIGS. 3 and 4, the connector 2 includes a reflection member and connects adjacent reinforcing panels 1 to each other. Specifically, the connecting tool 2 connects adjacent reinforcing panels 1 to each other at their longitudinal flanges 12. As shown in FIG. 3, among the rows formed by connecting the plurality of reinforcing panels 1 in the circumferential direction of the tunnel T, the round head bolts 21 of the connecting tool 2 to be described later are provided in every other row. 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 portion (hereinafter, also referred to as “round head portion”) 22 and a shaft portion 23. The round head 22 faces the inside of the tunnel T and has a reflecting member on its surface. The reflecting member is formed of a known reflective coating film.
The round head bolt 21 is inserted into the hole 12 a of the longitudinal flange 12 with its axis oriented so as to extend along the extending direction of the tunnel T. That is, the round head bolt 21 is attached to the longitudinal flange 12 of the reinforcing panel 1 so that the round head 22 of the round head bolt 21 in particular faces the light source of the vehicle or the like entering the tunnel T. There is.
As the reflective member, it is preferable to use a retroreflective member formed of, for example, a retroreflective coating film. 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 the retroreflective member has self-reflection beads which are transparent beads having a reflective film formed on at least a part of the surface thereof, and a transparent resin. The self-reflection beads are fixed by a transparent resin with a gap left between them.

The shaft portion 23 has a screwing portion 23 a into which the nut 24 is screwed and fastened, and a protruding portion 23 b housed in the hole 27 a of the rotation preventing member 26. The threaded 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 side opposite to the insertion side, and the nut 24 is screwed. It has been concluded.
The protruding portion 23b is located at a connecting portion between the round head 22 and the shaft portion 23, that is, between the round head 22 and the screwing portion 23a. As shown in FIG. 5B, the projecting portion 23b has an elliptical planar shape (contour) that projects at least partially from the outer periphery of the threaded portion 23a to the outside in the radial direction. As shown in FIG. 4, the protruding portion 23b is housed in the hole 27a of the rotation preventing member 26 when the adjacent reinforcing panels 1 are connected to each other. In this state, when the round head bolt 21 tries to rotate by fastening the nut 24, at least a part of the outer peripheral surface of the protruding portion 23b always contacts 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 sandwiches the adjacent longitudinal flange 12 with the round head 22 of the round head bolt 21 to reinforce the reinforcing panels 1. Contribute to the connection of. A known nut can be used as the nut 24, and for example, the hexagonal nut 24 shown in FIG. 6A can be used. In addition to the hexagon nut 24, a cap nut 24A shown in FIG. 6(b) can be used. The hemispherical (dome-shaped) cap (head) 24</b>Aa of the cap nut 24</b>A faces the inside of the tunnel T in a state of being fastened with the screwed portion 23 a, and like the round head 22 of the round head bolt 21, The surface may be provided with a reflective member, particularly a retroreflective member.
The cap nut 24A is fastened to the screwing portion 23a such that the top portion of the cap nut 24A faces a light source such as a vehicle that has entered the tunnel T.

[Washer]
As shown in FIG. 4, a washer 25 is arranged 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 connectors)
Adjacent reinforcing panels 1 other than the above-described connecting tool 2 are connected to each other by another connecting tool 3 including, for example, a known bolt and a nut screwed to the bolt, as shown in FIG. The bolts are inserted into the holes 12a of the long flanges 12 and the holes 13a of the short flanges 13 of both reinforcing panels 1 to be connected, and the nuts are fastened on the side opposite to the insertion side. In addition, in FIG. 3, since the inside of the tunnel T is perspectively 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 an ellipse in plan view. That is, the protrusion 23b and the hole 27a have complementary shapes. The hole 27a has a size that allows the threaded portion 23a to be inserted and accommodates the protruding portion 23b. When the projecting portion 23b is housed 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 projecting portion 23b. This interval allows a slight rotation of the round head bolt 21 when the nut 24 is fastened, but does not allow one turn (circulation) of the protruding portion 23b, that is, the round head bolt 21.
The short side portion 28 is bent and extends 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 that faces the inside of the tunnel T, and it is particularly preferable that a retroreflective member is provided.

The arcuate transition portion 29 between the long side portion 27 and the short side portion 28 on the side opposite to the surface of the rotation preventing member 26 facing the inside of the tunnel T is an edge facing the inside of the tunnel T of the longitudinal flange 12. Are in contact. The contact between the reinforcing panel 1 and the rotation preventing member 26 suppresses the rotation of the rotation preventing member 26 itself 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 at the transition portion 29 so as not to be relatively rotatable.
Further, even if the contact between the reinforcing panel 1 and the rotation preventing member 26 is insufficient, the rotation of the rotation preventing member 26 is prevented from rotating at least one edge portion of the short side portion 28 in the direction along the longitudinal flange 12. Contact with the longitudinal flange 12 is also prevented.

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

<Construction of reinforcing 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 along the circumferential direction to cover the inner wall surface of the existing tunnel T. Adjacent reinforcing panels 1 connect the short flanges 13 to each other by another connecting tool 3. After covering the inner wall surface of the tunnel T along the circumferential direction, next, the reinforcing panel 1 is sequentially connected by the connecting tool 2 and another connecting tool 3 along the extending direction of the tunnel T. Here, the reinforcing panels 1 are arranged such that the holes 12a and 13a of the flanges 12 and 13 are exposed in the tunnel T. Further, adjacent reinforcing panels 1 are arranged in a zigzag pattern by shifting the short flanges 13 side by side in the circumferential direction of the tunnel T by about half of the length of the reinforcing panel 1 in the longitudinal direction. .. When viewed in the extending direction of the tunnel T, the longitudinal flanges 12 are arranged so that every other longitudinal flange 12 has the same height from the ground. As shown in FIG. 3, in the longitudinal flanges 12 arranged side by side every other one, the reinforcing panels 1 are connected to each other using the connecting tool 2.
To connect the reinforcing panels 1 to each other, first, the rotation preventing member 26 is installed on the longitudinal flange 12 of one of the reinforcing panels 1 to be connected, and then the round head bolt 21 is inserted into the hole 27a of the rotation preventing member 26. In this state, the protruding portion 23b of the round head bolt 21 is located inside the hole 27a of the rotation preventing member 26. When the anti-rotation member 26 is installed, the hole 12a of the longitudinal flange 12 and the hole 27a of the anti-rotation member 26 communicate with each other, and ideally concentric with each other.
Next, the washer 25 is fitted to the threaded 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 partially contacts the hole 27a of the anti-rotation member 26 at the protrusion 23b, and the anti-rotation member 26 contacts the longitudinal flange 12 at the transition portion 29. As a result, the nuts 24 are fastened to the round head bolts 21 while preventing the round head bolts 21 from going around, and the adjacent reinforcing panels 1 are connected to each other.

<Action and effect>
Due to the existence of the rotation preventing member 26, it is possible to prevent the round head bolt 21 from being used together when the nut 24 is fastened to the round head bolt 21. This eliminates the need to fix the round head 22 of the round head bolt 21 provided with the reflecting member with a tool at the time of fastening the nut 24, and the adjacent reinforcing panel 1 can be simply tightened without damaging the reflecting member. It is possible to connect each other. Furthermore, since the round head bolt 21 is provided on the longitudinal flange 12 so as to face, for example, the headlight of the vehicle that has entered the tunnel T, 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, when the light emitted from the headlight of the vehicle hits the round head 22 of the round head bolt 21, it is reflected as reflected light toward the passenger. .. Thus, the passenger can visually recognize the reflected light to recognize that there is a reinforcing wall (wall surface) of the tunnel T at that position, and even in the tunnel T where the amount of light by illumination is not sufficient, The position of the reinforcing panel or the like can be easily recognized by the reflected light from the retroreflective member.

Further, the shapes of the protrusion 23b and the hole 27a are complementary, and the outer peripheral surface of the protrusion 23b at least partially contacts the inner peripheral surface of the hole 27a when the nut 24 is fastened. As a result, it is possible to prevent the round head bolt 21 from being rotated together with the nut 24. Further, since the rotation preventing member 26 is in contact with the longitudinal flange 12 so as not to rotate relative to each other, 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 preventing member 26 that faces the inside of the tunnel T, the light emitted from the headlight of the vehicle is directed to the passenger as the reflected light from the entire coupling tool 2. As a result, the passenger can more reliably recognize the position of the reinforcing wall of the tunnel T.

Further, when the nut is configured as the cap nut 24A and the cap 24Aa is provided with the 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. As a result, the reinforcing wall of the tunnel T can be reliably viewed in any traveling lane of the tunnel T for two-way traffic.

<Other>
The shape of the protrusion 23b may be another shape such as an ellipse or a polygon. The shape of the hole 27a may be another shape such as an ellipse or a polygon, like the shape of the protrusion 23b.
The installation place of the coupling tool 2 is not limited to the long flange 12, but may be provided on the short flange 13. Further, the directions of the round heads 22 of the round head bolts 21 can be alternately oriented in different directions along the extending direction of the longitudinal flange 12. Further, the direction of the round head 22 of the round head bolt 21 can be changed for each row of the reinforcing panels 1 which are continuous in the extending direction of the tunnel T.
The round head bolts 21 of the connector 2 are not only arranged in the rows of the reinforcing panels 1 that are formed alternately, but may be arranged in all the rows of the reinforcing panels 1. It may be formed in rows of stiffening panels 1 every two or more.

<Modification 1>
Next, a first modification of the rotation preventing member will be described. The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. FIG. 8 is a sectional view showing a modified example 1 of the rotation preventing member.
The rotation preventing member 26A in the connector 2A according to the modification 1 is formed in an L-shaped cross section like the rotation preventing member 26, and has a long side portion 27A and a short side portion 28A. 26 A of rotation prevention members have the contact part 27Ab which contacts the plate 11 in 27 A of long sides. Specifically, the contact portion 27Ab contacts the 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 26A with respect to the reinforcing panel 1.
Even in the first modification, at least the same actions and effects as those of the above-described embodiment can be obtained.

<Modification 2>
Next, a modified example 2 of the rotation preventing member will be described. The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. FIG. 9 is a cross-sectional view showing a modified example 2 of the rotation preventing member.
The rotation prevention member 26B in the connector 2B according to Modification 2 is a flat plate member. The rotation preventing member 26B has a contact portion 26Ba that comes into contact with the plate 11 of the reinforcing panel 1 at the edge opposite to the side facing the inside of the tunnel T. Specifically, the contact portion 26Ba contacts the 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 second modification, at least the same operation and effect as those of the above-described embodiment can be obtained.

<Modification 3>
Next, a modified example 3 of the rotation preventing member will be described. The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. 10A is a cross-sectional view showing Modification Example 3 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.
The rotation preventing member 26C in the connector 2C according to Modification 3 is different from the above-described embodiment and Modifications 1 and 2 in position fixing using a tool such as a wrench when fastening the nut 24 to the round head bolt 21. By doing so, it is impossible to rotate relative to the reinforcing panel 1. The rotation preventing member 26C has a polygonal outer edge in plan view. The tool at least partially engages this outer edge and prevents the rotation prevention member 26C from rotating relative to the reinforcing panel 1 by tightening the nut 24. The anti-rotation member 26C may have a square anti-rotation member 26Ca as shown in FIG. 10B or a hexagonal anti-rotation member 26Cb as shown in FIG. 10C.
Even in the third modification, at least the same operation and effect as those of the above-described embodiment can be obtained.
Further, since the tool is engaged 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, a modified example 4 of the rotation preventing member will be described. The same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. 11 is a 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.
The rotation preventing member 26D in the connector according to the modification 4 is different from the above-described embodiment and modifications 1 to 3 in that a plurality of rotation preventing members are formed as one member, and the longitudinal direction of the longitudinal flange 12 is different. Is formed in an elongated flat plate shape, and has a plurality of holes 27Da into which the round head bolts 21 are inserted, along the extending direction. The distance between the holes 27Da and 27Da coincides with the distance between the adjacent holes 12a of the longitudinal flange 12. Here, the "interval" is the distance between the axes of the adjacent holes 12a: 27a. The number of holes 27a may be, for example, two as shown in FIG. 11(a) or three as shown in FIG. 11(b), and may be the same as the number of holes 12a of the longitudinal flange 12. It may be.
As in the second modification, the rotation preventing member 26D contacts the reinforcing panel 1 at the edge on the side opposite to the side facing the inside of the tunnel T, and thus cannot rotate relative to the reinforcing panel 1.
The rotation prevention member 26D may be formed in an L-shaped cross section.
Even in the modification 4, at least the same operation and effect as those of the above-described embodiment can be obtained.
With the above configuration, it is only necessary to provide one rotation preventing member 26D for a plurality of holes 12a as compared with the connection work using the rotation preventing members individually for each hole 12a of the longitudinal flange 12. Therefore, the work load can be further reduced.

1 Reinforcement Panel 2 Connecting Tool 3 Other Connecting Tool 11 Plate 12, 13 Flange 12a, 13a Hole 21 Round Head Bolt 22 Round Head 23 Shaft 23a Screwing Part 23b Projection 24 Nut 24A Cap Nut 24Aa Cap 26, 26A, 26B, 26C, 26D Anti-rotation members 27a, 27Da Hole 100 Tunnel reinforcing structure T Tunnel

Claims (9)

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 the shaft of the bolt, and a connecting tool for connecting adjacent reinforcing panels to each other;
Equipped with
The reinforcing panel includes a plate facing the inner surface of the tunnel, and a reinforcing panel that is erected on the edge of the plate so as to face the extending direction of the tunnel and is adjacent to the extending direction of the tunnel. And a flange used for connection,
The connector has a rotation preventing member that is provided between the round head of the bolt and the reinforcing panel and that engages with the shaft of the bolt to prevent the bolt from being rotated by tightening the nut. Then
The round head is provided on the reinforcing panel so as to face the light source that has entered the tunnel ,
The shaft portion of the bolt is a screwing portion to which the nut is fastened, and a protruding portion provided at a connecting portion with the round head portion that at least partially protrudes radially outward from the outer periphery of the screwing portion. And have,
The rotation preventing member has a hole into which the threaded portion is inserted and which accommodates the protruding portion,
The protrusion and the hole have complementary shapes to each other, and the first portion facing the surface of the flange facing the extension direction of the tunnel and the first portion extending in the extension direction of the tunnel and the extension of the flange. A second portion intersecting in the present direction,
The second portion contacts the tip of the flange on the inner side of the tunnel to prevent the bolt from rotating around.
Reinforcement structure of tunnel characterized by that. Tunnel reinforcing structure according to claim 1, characterized in that said anti-rotation member, the reflecting member on a surface facing the inside of the tunnel is provided. The reinforcing structure for a tunnel according to claim 1 or 2, wherein the rotation preventing member has a plurality of the holes along an extending direction. The reinforcing structure for a tunnel according to any one of claims 1 to 3, wherein the anti-rotation member is in non-rotatable contact with the reinforcing panel. The reinforcing panel includes a plate facing the inner surface of the tunnel, and a flange erected on the edge of the plate,
The connector, the tunnel reinforcement structure according to any one of claims 1 to 4, characterized in that provided in the flange. The tunnel reinforcing structure according to any one of claims 1 to 5 , 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 6, wherein the reflecting member is a retroreflective coating film. The reinforcing structure for a tunnel according to any one of claims 1 to 7 , wherein the connecting members are arranged regularly along the extending direction of the tunnel. A reinforcing panel connector used in the reinforcing structure for a tunnel according to any one of claims 1 to 8 .