JP7339141B2 - Tunnel covering structure and covering panel member - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tunnel covering structure and a covering panel member, and more particularly to a tunnel covering structure formed to cover an inner wall surface of a tunnel having a curved cross-sectional shape, and a covering panel member used for the covering structure.

Tunnels constructed by various tunnel construction methods, such as the mountain tunnel construction method and the shield tunnel construction method, must be coated with mortar on the inner wall of the excavated tunnel to prevent the ground around the excavated tunnel from collapsing or loosening. It is covered with a hardening material such as concrete or concrete, or with a cover made of a covering member such as a segment. In addition, these coverings are generally formed in a shape having a curved cross-sectional shape such as a horseshoe or a circle so that they can efficiently support the load from the surrounding ground. be.

In addition, for example, in a mountain tunnel construction method, a covering having an arch shape including a curved cross-sectional shape portion from the side part to the upper part of the tunnel can be efficiently formed with a cement-based hardening material such as concrete. As forms, for example, collapsible or mobile forms for tunnel lining are known (see, for example, Patent Documents 1 and 2). As the tunnel excavation work progresses, these tunnel lining forms are re-installed every predetermined construction span of, for example, about 10.5 m. The arch-shaped covering including the shaped portions can be formed sequentially.

JP 2001-280094 A Japanese Patent Application Laid-Open No. 2003-262096

In the method of forming a covering having a shape including a curved cross-sectional shape on the inner wall surface of a tunnel using a tunnel lining formwork, the formed covering has a similar cross-sectional shape over a considerable construction section. If it has a As a result, the formwork becomes too large, and the tunnel lining formwork fills the space between the tunnel lining formwork and the inner wall of the tunnel due to the support structure installed inside the tunnel. Therefore, it takes a lot of time and effort to reassemble the formwork together with the support structure installed inside the tunnel according to the cross-sectional shape of these short construction sections. will be required.

In addition, the inner space of the tunnel cross section is occupied by the support structure, and depending on the size of the cross-sectional area of the tunnel and the conditions of use, it may hinder the passage of work machines and general vehicles for tunnel construction.

Furthermore, for tunnels formed by other tunnel construction methods such as the seal tunnel construction method, for example, in sections where the cross section is widened, sections that require reinforcement or repair of the covering, etc., the load of the hardening material to be filled To easily form a covering covering the inner wall surface of a tunnel having a curved cross-sectional shape portion by supporting the load of a hardening material with a simple structure without installing a large-scale support structure for supporting the inside of the tunnel. There is a demand for the development of technology that makes it possible.

The present invention supports the load of the hardening material with a simple structure without installing a large-scale support structure for supporting the load of the hardening material to be filled inside the tunnel, and provides a tunnel having a curved cross-sectional shape. It is an object of the present invention to provide a covering structure for a tunnel and a covering panel member used for the covering structure in which a covering can be easily formed to cover the inner wall surface of the tunnel.

The present invention relates to a tunnel covering structure formed to cover an inner wall surface of a tunnel having a curved cross-sectional shape portion, wherein the inner wall of the tunnel having the curved cross-sectional shape portion is spaced at a predetermined interval in the extension direction of the tunnel. a plurality of steel support members having inner panel mounting surfaces mounted along a wall surface, and a steel support member straddling the panel mounting surfaces of each adjacent pair of said steel support members; A plurality of covering panel members supported and attached in series in the circumferential direction, and a space between the attached covering panel members and the inner wall surface of the tunnel is filled with the steel support member and the covering. The covering panel member includes a curable material that is integrated with the panel member, and the covering panel member has an L-shaped anchor bar that protrudes toward the back side and is bent in the extension direction X of the tunnel. The above objects are accomplished by providing a tunnel covering structure which is oriented and mounted as an anchor member .

In the tunnel covering structure of the present invention, it is preferable that the steel supporting member is an I-shaped steel or an H-shaped steel, and the flange surface thereof forms the panel mounting surface.

Further, in the tunnel covering structure of the present invention, it is preferable that the covering panel member is a member made of fiber-reinforced concrete and having a rectangular planar shape.

Further, in the tunnel covering structure of the present invention, it is preferable that a reinforcing bar is disposed inside the space.

In the tunnel covering structure of the present invention, the panel mounting surface of the steel supporting member is provided with the covering panel member pressed against the steel supporting member when the space is filled with the hardening material. It is preferable that a nut member for fastening the pressing fixing member for fixing with the steel support member is fixed.

Further, in the tunnel covering structure of the present invention, it is preferable that a lower anchor member is attached so as to protrude into the space from the inner wall surface of the lower portion of the tunnel having the curved cross-sectional shape portion.

The present invention also provides a covering panel member for use in the above tunnel covering structure, which has a rectangular planar shape sized to straddle the panel mounting surfaces of the pair of steel support members adjacent to each other. The above object is achieved by providing a cover panel member having an uneven surface on the rear side facing the inner wall surface of the tunnel.

Further, in the covering panel member of the present invention, it is preferable that the uneven surface is formed by a large number of evenly distributed recessed holes.

In addition, the covering panel member of the present invention has a rectangular planar shape with a size that spans the panel mounting surfaces of the pair of steel support members that are adjacent to each other, and is arranged to face the inner wall surface of the tunnel. It is preferable that a nut member for attaching the anchor member is embedded and fixed on the back side where the anchor member is attached.

Further, the covering panel member of the present invention preferably has a curved shape that follows the curved shape of the curved cross-sectional portion of the tunnel.

Furthermore, the covering panel member of the present invention is preferably made of fiber-reinforced concrete.

According to the covering structure of the tunnel or the covering panel member used in the covering structure of the present invention, the load of the hardening material can be reduced without installing a large-scale support structure inside the tunnel to support the load of the hardening material to be filled. can be easily formed to cover the inner wall surface of the tunnel having the curved cross-sectional shape.

FIG. 4 is a schematic cross-sectional view of a widened portion of a tunnel in which a cladding covering the inner wall surface of the tunnel is formed by a cladding structure for the tunnel according to a preferred embodiment of the present invention; FIG. 2 is an enlarged view of part A in FIG. 1; FIG. 3 is a partial vertical cross-sectional view along BB of FIG. 2 with a hold-down member attached, illustrating a tunnel covering structure according to a preferred embodiment of the present invention; (a) is a cross-sectional view of a steel support member, and (b) is a partial inner view of the steel support member, explaining a nut member fixed to a panel mounting surface. (a) is a front view of the covering panel member, (b) is a rear view, (c) is a cross-sectional view taken along line CC of (b), and (d) is an enlarged view of part D of (c). FIG. 4 is a development arrangement view of covering panel members, explaining a state in which a plurality of covering panel members are continuously arranged in the circumferential direction along the inner wall surface of a tunnel; (a) is a partial schematic inner view, (b) is EE of (a), explaining the situation of attaching a plurality of covering panel members so as to straddle the panel mounting surfaces of a pair of steel support members. (c) is a partial schematic cross-sectional view along FF of (a).

A tunnel covering structure 10 according to a preferred embodiment of the present invention, as shown in FIG. A coating 55 (see FIG. 3) having a predetermined thickness covering the inner wall surface 51 from 52 to the arch-shaped portion 53 is coated with a hardening material 13, preferably a cement-based hardening material such as non-shrinking mortar. It was adopted as a structure for efficient formation. For example, in the mountain tunnel construction method, when forming a cover covering the inner wall surface of an excavated tunnel using concrete, for example, it is common to use a movable or prefabricated tunnel lining form called a center. In general, when using a formwork for tunnel lining, if the formed covering has a similar cross-sectional shape over a considerable construction section, it is possible to construct it efficiently. , For example, for sections where the cross section is widened, sections that require reinforcement or repair of the covering, etc., where only short construction sections have the same cross-sectional shape, the formwork becomes too large and Therefore, it takes a lot of time and effort to reassemble the support structure installed inside the tunnel together with the formwork. For this reason, in this embodiment, by adopting the tunnel covering structure 10 described later, the inner wall surface 51 of the tunnel 50 having a curved cross-sectional shape portion can be formed even for a short construction section with a simple configuration. To efficiently form a covering body 55. - 特許庁

The tunnel covering structure 10 of the present embodiment is used as the inner wall surface 51 of the tunnel 50 having a curved cross-sectional shape, for example, in the widened portion of a mountain tunnel, from the side wall portion 52 to the arch-shaped portion 53 of the tunnel 50. A covering structure formed over the wall surface 51, and as shown in FIGS. 1 to 3, a tunnel having curved cross-sectional portions at predetermined intervals in the extension direction X of the tunnel 50 (see FIG. 3). A plurality of steel support members 11 having panel mounting surfaces 11a on the inside, which are attached along the inner wall surface 51 of 50, and straddle the panel mounting surfaces 11a of each adjacent pair of steel support members 11, A plurality of cover panel members 12 supported by steel support members 11 and attached in series in the circumferential direction, and a space 56 between the attached cover panel members 12 and the inner wall surface 51 of the tunnel 50 is filled with It comprises a steel support member 11 and a mortar 13 of hardenable material, preferably non-shrinkage, integral with the covering panel member 12 . Together, the steel support member 11 , the plurality of covering panel members 12 , and the cured non-shrinkage mortar 13 form a covering 55 covering the inner wall surface 51 of the tunnel 50 .

In this embodiment, the steel support member 11 that constitutes the tunnel covering structure 10 is preferably made of I-shaped steel or H-shaped steel (I-shaped steel in this embodiment), and the flange surface of the steel support member 11 has a panel mounting surface 11a. is formed. The steel support member 11 made of I-shaped steel is preferably preliminarily prepared in a factory or the like by forming the inner wall surface 51 from the side wall portion 52 of the tunnel 50 to the arch-shaped portion 53 above the bottom inverted portion 57 (see FIG. 1). It is carried into the site as a plurality of unit support members that are processed into shapes that are appropriately divided along the shape, and is integrally continuous in the circumferential direction by a known method using bolt members etc., from the side wall portion 52 It can be installed along the inner wall surface 51 up to the arched portion 53 . The steel support members 11 made of I-shaped steel are installed in a plurality of rings in the extension direction X of the tunnel 50 at a predetermined center-to-center pitch of about 900 mm, for example.

Further, in this embodiment, the steel support members 11 made of I-shaped steel, as shown enlarged in FIG. When the secondary shotcrete 59 having a predetermined thickness is sprayed inside, it is preferable to embed the portion on the side of the outer flange 11b in the secondary shotcrete 59 . This allows the steel support member 11 to be installed along the inner wall surface 51 from the side wall portion 52 to the arch-shaped portion 53 and fixed in a stable state. The inner surface of the inner flange 11c of the installed I-beam steel support member 11 forms the panel mounting surface 11a to which the covering panel member 12 is mounted. On the inner side surface of the inner flange 11c, which becomes the panel mounting surface 11a, preferably the same interval as the width of the continuous installation direction Y of the covering panel member 12 is provided in the circumferential direction (see FIG. 7), as shown in FIGS. 3 and 4 ( As shown in a) and (b), a nut member 21 for fastening a pressing fixing member 20 (to be described later) to the steel supporting member 11 is preferably fixed by welding or the like to the central portion in the lateral width direction.

A plurality of covering panel members 12 attached so as to straddle the panel mounting surfaces 11a of each pair of adjacent steel support members 11 each have a length of about 20 mm, for example, as shown in FIGS. It is a panel member, preferably made of fiber reinforced concrete, having a thickness of . The cover panel member 12 has a size of about 870 mm, which is slightly smaller than the pitch between the centers of the steel support members 11 in the extension direction X of the tunnel 50, as a size that spans the panel mounting surfaces 11a of the pair of steel support members 11 that are adjacent to each other. and a vertical width of about 470 mm in the continuous direction Y, which is the circumferential direction.

In addition, the covering panel member 12 preferably has an uneven surface 12a on the back side thereof, which is arranged to face the inner wall surface 51 of the tunnel 50 covered with the primary sprayed concrete 58 and the secondary sprayed concrete 59. The face 12a is formed, for example, by a number of evenly distributed sinkholes 12b. In this embodiment, the sinkhole 12b is a hexagonal or circular sinkhole. The uneven surface 12a on the back side of the covering panel member 12 widens the adhesion area with the non-shrinking mortar 13 to be injected and filled later, and the non-shrinking mortar 13 is made stronger on the back side of the covering panel member 12. It can be attached. In addition, since the uneven surface 12a is formed by a large number of hexagonal or circular recessed holes 12b that are evenly distributed, the non-shrinkage mortar 13 in the recessed holes 12b can be prevented by eliminating the sharp corners. The non-shrinkable mortar 13 can be firmly integrated with the back surface of the cover panel member 12 by preventing the occurrence of unfilled portions.

Further, in the present embodiment, anchor bars 14 (see FIGS. 2 and 3) as anchor members are preferably attached to the rear surface side of the cover panel member 12 which is arranged to face the inner wall surface 51 of the tunnel 50. , the nut member 12c is embedded and fixed. The nut member 12c is a flanged nut having a size of about M10. The nut members 12c are dispersedly arranged and fixed at four locations in a state in which the flange portion is embedded in the fiber-reinforced concrete and the female screw hole is opened on the back side. Each nut member 12c has an L-shaped bent anchor bar 14 with a thickness of, for example, about D10. It can be detachably attached by protruding into the space 56 between the inner wall surface 51 of the .

The plurality of cover panel members 12 are supported by the steel support members 11 using, for example, pressing and fixing members 20 to be described later, and as shown in FIGS. Along the inner wall surface 51 of the tunnel 50 from the portion 52 to the arch-shaped portion 53, they are continuously arranged in the circumferential direction. The cover panel member 12' arranged at the top end of the arch-shaped portion 53, which is the central panel of the plurality of cover panel members 12 arranged in series, is preferably made of non-shrink mortar as a hardening material. A mortar supply hole 12d having a size of about φ60 is formed to supply and fill the space 56 with the mortar supply hole 12d. The mortar supply hole 12d can be closed openably and closably by using a socket member, for example.

In this embodiment, the cover panel member 12 is preferably formed of fiber reinforced concrete and has a flat rectangular planar shape. Covering panel member 12 may also be formed with a curved shape that follows the curved shape of the curved cross-sectional portion of tunnel 50 . By forming the covering panel member 12 so as to have a curved shape along the curved shape of the curved cross-sectional shape portion of the tunnel 50, a stronger arch action effect can be exhibited against the external force from the natural ground side. be possible.

In the tunnel covering structure 10 of the present embodiment, a plurality of I-shaped steels are installed along the inner wall surface 51 of the tunnel 50 having a curved cross-sectional shape portion at a predetermined center-to-center pitch in the extension direction X of the tunnel 50. A plurality of the above-described covering panel members 12 are mounted in series in the circumferential direction so as to straddle the panel mounting surfaces 11a of each adjacent pair of steel supporting members 11 of the steel supporting member 11, and are mounted. The space 56 between the covered panel member 12 and the inner wall surface 51 of the tunnel 50 covered by the primary shotcrete 58 and secondary shotcrete 59 is filled with a hardening material, preferably non-shrink mortar 13 .

In this embodiment, as shown in FIGS. 7(a) to 7(c), the cover panel member 12 is pressed against the panel mounting surface 11a of the steel support member 11 and fixed. , using a pressing fixing member 20, are attached in a state in which they are continuously arranged in the circumferential direction and supported by the steel supporting member 11. As shown in FIG. The pressing and fixing member 20 is made of, for example, a square pipe having a rectangular cross section with a side of about 60 mm, and the space between the outer side portions of the panel mounting surfaces 11a of each adjacent pair of steel supporting members 11 is larger than the distance between them. It has a slightly longer length of about 1100mm. The pressing fixing member 20 extends in the tunnel extension direction X at the central portion of the longitudinal width of the continuous installation direction Y in each covering panel member 12 arranged in series in the circumferential direction, and a pair of adjacent are mounted so as to vertically intersect with each of the steel support members 11 of .

The pressing fixing member 20 is screwed onto a nut member 21 fixed to the panel mounting surface 11a of the steel supporting member 11. A fixing bolt member 22, for example, provided with a rib washer or a tightening nut, is screwed onto the nut member 21. As a result, by fastening both ends to the steel support members 11 so as to be sandwiched between the rib washers, the continuous covered panel members 12 are pressed against the steel support members 11, respectively. It can be fixed firmly. In this embodiment, each pair of covering panel members 12 adjacent in the extension direction X of the tunnel is installed so as to straddle a pair of adjacent steel support members 11 and is connected in the circumferential direction. By arranging the pressing and fixing members 20 that press the covering panel members 12 respectively at the central portion of the covering panel member 12 in the longitudinal width direction, the pressing and fixing members 20 are arranged in the central portion of the adjacent covering panel members 12 by displacing them vertically. The ends of a pair of pressing fixing members 20 for pressing the adjacent covering panel members 12 can be simultaneously fastened to the steel support member 11 by one fixing bolt member 22 via rib washers. It's becoming

A plurality of covering panel members 12 are attached to the panel mounting surface 11a of the steel support member 11 in a continuous manner in the circumferential direction using the pressing fixing member 20 and the fixing bolt member 22, so that each adjacent pair of steel In the area sandwiched by the support members 11, preferably as a hardening material, between the attached cover panel member 12 and the inner wall surface 51 of the tunnel 50 covered by the primary and secondary shotcrete 58 and 59 shotcrete. A space 56 filled with the non-shrinkage mortar 13 is formed. By attaching the anchor bars 14 to the back side of the covering panel member 12, the anchor bars 14 can be projected into the space 56 filled with the curable material 13. - 特許庁The anchor bars 14 can enhance the integrity between the covering panel member 12 and the non-shrinkage mortar 13 that fills the space 56 . From the viewpoint of effectively enhancing the integrity of the covering panel member 12 and the non-shrinkable mortar 13, the L-shaped bent anchor bars 14 should be arranged so that the bending direction is along the extension direction X of the tunnel. is preferable (see FIG. 7(b)).

Also, the space 56 in which the hardenable material 13 is filled may be provided with rebar, preferably prior to attaching the cover panel member 12 to the panel mounting surface 11a of the steel support member 11. can. By arranging reinforcing bars inside the space 56 filled with the curable material 13, the strength of the formed covering 55 can be effectively increased.

Furthermore, in this embodiment, as shown in FIG. 1, the inner wall surface of the side wall portion 52 covered with the primary shot concrete 58 and the secondary shot concrete 59 is used as the inner wall surface 51 at the lower portion of the tunnel 50 having a curved cross-sectional shape portion. A lower anchor member 15 is preferably attached so as to protrude from 51 into space 56 . The lower anchor member 15 is made of, for example, a reinforcing bar having a thickness of about D19. Like 14, it has an L-shaped bent shape. The lower anchor member 15 is preferably formed by embedding the base end portion in the secondary sprayed concrete 59 or the primary sprayed concrete 58, so that the bending direction of the lower anchor member 15 extends along the circumferential direction of the tunnel 50. Each is fixed at three locations. Since the lower anchor member 15 is provided so as to protrude from the inner wall surface 51 of the lower part of the tunnel 50 into the space 56 filled with the curable material 13, a large load including the self weight of the cover 55 acts. It is possible to effectively reinforce the interface between the lower coating 55 and the secondary sprayed concrete 59 and form a coupled structure of the two to form a strong lining.

According to the tunnel covering structure 10 of the present embodiment, the covering panels arranged continuously in the circumferential direction of the portion sandwiched between the pair of adjacent steel support members 11 formed as described above. In each of the one or more spaces 56 between the member 12 and the inner wall surface 51 of the tunnel 50 covered by the primary shotcrete 58 and the secondary shotcrete 59 there is preferably a non-shrinkage mortar 13 as a hardening material. Each filling forms a covering 55 covering the inner wall surface 51 of the tunnel 50 having a curved cross-sectional shape portion.

That is, among the plurality of covering panel members 12 arranged in series in the circumferential direction, the covering panel member 12 ′ arranged at the top end of the arch-shaped portion 53 has the curable material 13 in the space 56 . Since mortar supply holes 12d for supply are formed (see FIG. 1), mortar supply pipes (not shown) are connected to these mortar supply holes 12d to supply non-shrink mortar 13. , the space 56 between the covering panel member 12 and the inner wall surface 51 of the tunnel 50 can be filled with non-shrink mortar 13 respectively. When the filled non-shrinkage mortar 13 hardens and integrates with the covering panel member 12, the fixing bolt members 22 and pressing fixing members 20 that fasten and fix the covering panel member 12 to the steel support member 11 are removed. As a result, the covering 55 covering the inner wall surface 51 of the tunnel 50 is easily formed by integrating the steel supporting member 11, the plurality of covering panel members 12, and the hardened non-shrinkage mortar 13 together.

Therefore, according to the tunnel covering structure 10 of the present embodiment, a plurality of steel plates are attached along the inner wall surface 51 of the tunnel 50 having a curved cross-sectional shape portion at predetermined intervals in the extension direction X of the tunnel 50 . A steel support member 11, a plurality of covering panel members 12 attached in series in the circumferential direction so as to straddle the panel mounting surfaces 11a of a pair of adjacent steel supporting members 11, and a covering panel member 12 Since the space 56 between the inner wall surface 51 of the tunnel 50 is filled with the curable material 13 integrated therewith, a large-scale support for supporting the load of the curable material 13 to be filled is provided. A covering that covers the inner wall surface 51 of the tunnel 50 having a curved cross-sectional shape by supporting the load of the preferably non-shrinkable mortar 13 that is a hardening material with a simple structure without installing the structure inside the tunnel 50. 55 can be easily formed.

In addition, as a result, the inner wall surface 51 of the tunnel 50 has a similar cross-sectional shape only for a short construction section, such as a section where the cross section is widened or a section that requires reinforcement or repair of the covering. Even when forming the covering 55 covering the tunnel 50, it is possible to efficiently form the covering 55 covering the inner wall surface 51 of the tunnel 50 having a curved cross-sectional shape in a short construction section with a simple configuration. Become.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the covering structure of the tunnel of the present invention can be used not only to form a covering covering the inner wall surface from the side wall to the arch-shaped portion in the widened portion of the mountain tunnel, but also to cover the mountain tunnel in the portion other than the widened portion. It can also be used when forming a covering to cover the inner wall surface of tunnels having various other curved cross-sectional shapes such as shield tunnels. The steel support members need not necessarily be I-beams or H-beams, but can be any other variety of steel members such as channel steels, angle steels, etc., which can provide panel mounting surfaces on the inside. Also good. The cover panel member does not necessarily have to be made of fiber-reinforced concrete, and may be made of other materials such as synthetic resin, steel, and cast iron. The hardening material that fills the space between the covering panel member and the inner wall of the tunnel includes non-shrinking mortar, normal mortar, concrete, cement-based hardening materials such as cement milk, and non-cementitious hardening materials. can be

10 Tunnel covering structure 11 Steel supporting member (I-beam)
11a panel mounting surface 11b outer flange 11c inner flange 12 covering panel member 12a uneven surface 12b depression hole 12c nut member 12d mortar supply hole 13 non-shrinking mortar (curing material)
14 Anchor bar 15 Lower anchor member 20 Pressing fixing member 21 Nut member 22 Fixing bolt member 50 Tunnel 51 Inner wall surface 52 Side wall portion 53 Arch-shaped portion 55 Cover 56 Space 57 Invert portion 58 Primary shot concrete 59 Secondary shot concrete X Tunnel Extension direction Y Direction in which covering panel members are connected

Claims (11)

A tunnel covering structure formed to cover an inner wall surface of a tunnel having a curved cross-sectional shape portion,
a plurality of steel support members having inner panel mounting surfaces mounted along the inner wall surface of the tunnel having the curved cross-sectional shape at predetermined intervals in the direction of extension of the tunnel;
a plurality of covering panel members mounted in series in the circumferential direction while being supported by the steel supporting members so as to straddle the panel mounting surfaces of the pair of adjacent steel supporting members;
comprising a hardenable material filling the space between the attached cover panel member and the inner wall of the tunnel and integral with the steel support member and the cover panel member ;
In the covering panel member, an L-shaped anchor bar protruding toward the back side is arranged so that the bending direction is along the extension direction X of the tunnel, and is attached as an anchor member of the tunnel. covering structure. 2. The tunnel covering structure according to claim 1, wherein said steel support members are I-beam steel or H-beam steel, and said panel mounting surface is formed by the flange surface thereof. 3. The covering structure for a tunnel according to claim 1, wherein the covering panel member is a fiber-reinforced concrete member having a rectangular planar shape. The tunnel covering structure according to any one of claims 1 to 3, wherein a reinforcing bar is provided inside the space. The panel mounting surface of the steel support member is provided with a press fixing member for fixing the covering panel member in a state of being pressed against the steel support member when the space is filled with the hardening material. The covering structure for a tunnel according to any one of claims 1 to 4, wherein a nut member is fixed to be fastened to the steel support member. The tunnel covering structure according to any one of claims 1 to 5 , wherein a lower anchor member is attached so as to protrude into the space from the inner wall surface of the lower portion of the tunnel having the curved cross-sectional shape portion. A covering panel member used in the tunnel covering structure according to any one of claims 1 to 6 ,
It has a rectangular planar shape sized to straddle the panel mounting surfaces of each pair of adjacent steel support members, and the back surface facing the inner wall surface of the tunnel is an uneven surface. covered panel members. 8. The covering panel member of claim 7 , wherein said uneven surface is formed by a number of evenly distributed sinkholes. A covering panel member used in the tunnel covering structure according to any one of claims 1 to 6 ,
It has a rectangular planar shape sized to straddle the panel mounting surfaces of the pair of adjacent steel support members, and the anchor member is provided on the back side facing the inner wall surface of the tunnel. cover panel member having embedded and fixed nut members for mounting the . A covering panel member according to any one of claims 7 to 9 , comprising a curved shape following the curved shape of the curved cross-sectional portion of the tunnel. A covering panel member according to any one of claims 7 to 10, wherein the covering panel member is made of fiber reinforced concrete.

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