JP6796160B2 - Tunnel internal structure and its construction method - Google Patents

Description

The present invention relates to a tunnel internal structure provided with an intermediate wall supporting a floor slab in the tunnel and a method for constructing the same.

The internal structure of the shield tunnel includes an intermediate wall that is arranged upright at the bottom of the tunnel and extends in the axial direction of the tunnel, and a floor slab that is arranged above the intermediate wall. is there. The upper part of the floor slab is used as a roadway on which general vehicles and the like travel, and the space below the floor slab is used for maintenance facilities such as drainage and electrical wiring and evacuation facilities. Such a shield tunnel is known to have a structure as disclosed in, for example, Patent Document 1.

A shield machine is used to construct the shield tunnel. A shield tunnel is constructed by excavating the ground at the tip of the shield machine and assembling the segments in the circumferential direction at the rear to construct a lining that supports the excavation cross section, repeating each ring.

The intermediate wall is formed by arranging a plurality of plate-like bodies side by side in the tunnel axial direction. These plate-like bodies are arranged so as to correspond to individual rings arranged in the direction of the tunnel axis. Each plate is usually a substantially rectangular precast concrete. Here, the precast concrete is a concrete member manufactured in advance at a factory or the like for assembling and installing at a tunnel construction site.

Japanese Unexamined Patent Publication No. 2007-284899

In the case of the tunnel internal structure as in the above example, after the invert is installed, if the following trolley or equipment transport vehicle runs on the invert, there is a possibility that minute damage or the like may occur on the invert. There is.

The work of repairing the surface of the invert may cause a delay in the construction period. Therefore, there is room for improvement in the method of constructing the inside of the tunnel in which the invert is installed as in the above example.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a tunnel internal structure that can be easily repaired even if a minute damage or the like occurs on the invert after installing the invert in the shield tunnel. It is to provide the construction method.

In order to achieve the above object, the method for constructing a tunnel internal structure according to the present invention is an invert that is arranged on the bottom of the tunnel and has a flat surface at the upper part, and is arranged in an upright state on the invert. This is a method for constructing an internal structure of a tunnel including an intermediate wall extending in the axial direction of the tunnel and a floor slab arranged above the intermediate wall. The method of constructing the internal structure of the tunnel is to install a precast invert in the direction of the tunnel axis between the shield machine and the trailing trolley that moves according to the excavation of the shield machine in the tunnel axial direction, or with the trailing trolley. and, further in the rear, the intermediate wall is placed on the plane of the precast invert, the floor slab is placed on top of the intermediate wall, the precast invert, after placing the intermediate wall and the floor plate , A concrete layer is cast on the precast tunnel so as to bury the lower part of the intermediate wall .
Further, in the method for constructing the tunnel internal structure according to the present invention, an invert which is arranged on the bottom of the tunnel and has a flat surface at the upper part and an invert which is arranged in an upright state on the invert and extends in the tunnel axial direction. It is a method of constructing an internal structure of a tunnel equipped with an intermediate wall and a floor slab placed on the upper part of the intermediate wall. The tunnel is excavated in the ground with a shield machine, and segments are assembled and excavated at the rear part. A lining that supports the cross section is constructed, then a precast invert is installed in the direction of the tunnel axis, the intermediate wall is installed on the plane of the precast invert, and the floor slab is installed on the upper part of the intermediate wall. Then, after the precast invert, the intermediate wall and the floor slab are installed, a concrete layer is cast on the precast invert so as to bury the lower part of the intermediate wall . A material / equipment transport vehicle that transports materials / equipment to the shield machine runs.

According to the present invention, after installing an invert in a shield tunnel, even if a minute damage or the like occurs on the invert, it can be easily repaired.

It is a perspective view which shows 1st Embodiment of the tunnel internal structure which concerns on this invention. It is sectional drawing of the arrow AA of FIG. It is a partial side sectional view which shows a part of BB arrow view of FIG. FIG. 3 is a cross-sectional view showing a connecting portion between the plate-shaped body and the precast invert in FIG. 3, where (a) shows a state in which the plate-shaped body and the precast invert are connected, and (b) shows a state before being connected. ing. It is a side view which shows roughly the intermediate wall and the like of the 2nd Embodiment of the tunnel internal structure which concerns on this invention. It is a schematic side view which shows one of the modification of the tunnel internal structure which concerns on this invention. It is a schematic side view which shows another modification of the tunnel internal structure which concerns on this invention.

Hereinafter, embodiments of the tunnel internal structure according to the present invention will be described with reference to the drawings.

[First Embodiment]
First, the first embodiment according to the present invention will be described with reference to FIGS. 1 to 4. The tunnel of the present embodiment is a shield tunnel 1 having a circular cross section constructed by the shield method, and is constructed by arranging rings 10 to be assembled on the wall surface of the excavated pit side by side in the excavation direction. The ring 10 attached to the wall surface of the excavation pit constitutes the tunnel wall portion. In FIG. 1, the entire circumference of the ring 10 is not shown, and the lower half is shown. The excavation direction in this example corresponds to the tunnel axial direction and extends substantially horizontally.

The shield tunnel 1 of the present embodiment includes the above-mentioned ring 10, the side wall concrete portion 15, the invert 50, the concrete layer 60, the floor slab 20, and the intermediate wall 30. The intermediate wall 30 is a wall that is arranged upright on the invert 50 at the bottom of the tunnel and extends in the direction of the tunnel axis. The floor slab 20 is a member arranged on the upper part of the intermediate wall 30. The space formed below the floor slab 20 is divided by an intermediate wall 30. In FIG. 2, the left side of the divided space is indicated by X and the right side is indicated by Y.

The floor slab 20 is a member on which a road surface on which a general vehicle or the like travels or a road surface for a passerby is formed at an upper portion, and directly receives a load of an automobile or a person traveling in a tunnel. Even when the floor slab 20 receives a load, the load is transmitted to the intermediate wall 30 and the like without causing deformation that hinders the running performance.

Hereinafter, the members constituting the shield tunnel 1 will be described. First, the ring 10 will be described. The ring 10 has a length in the tunnel axial direction, for example, 1 to 2 m, and the rings 10 are arranged side by side in the tunnel axial direction to form a tunnel wall portion. Each ring 10 is composed of a plurality of arcuate segments 10a. In this example, although details are omitted, the ring 10 is divided into nine equal parts. That is, the ring 10 is composed of nine arcuate segments 10a.

The side wall concrete portion 15 is a portion to be cast at the construction site on the inner wall surface 10b of the ring 10 constituting the inner wall surface of the tunnel, and extends in the direction of the tunnel axis. The side wall concrete portions 15 are provided on both the left and right sides with respect to the tunnel axial direction. The vertical position where the side wall concrete portion 15 is installed is slightly lower than the position where the length in the tunnel width direction is maximum, and the vertical positions of the left and right side wall concrete portions 15 are equally arranged. Here, the length in the tunnel width direction is a length perpendicular to the tunnel axis direction and in the horizontal direction, and is a length in the left-right direction in FIG.

Each side wall concrete portion 15 has a ring connecting portion 15a and an upper surface portion 15b. The ring connecting portion 15a is a portion connected to the inner wall surface 10b of the ring 10 and has a curved surface that bulges outward in the radial direction of the tunnel. The curved surface of the ring connecting portion 15a is formed so as to be in close contact with the inner wall surface 10b of the ring 10. A shear resistance member or the like (not shown) is embedded in the ring connection portion 15a. A flat surface extending in the tunnel axial direction is formed on the upper surface portion 15b. On the flat surface, the longitudinal end portion of the precast floor slab 21 constituting the floor slab 20 is placed. The precast floor slab 21 will be described later.

Subsequently, the invert 50 will be described. The invert 50 is arranged on the bottom of the shield tunnel 1 and has a flat surface at the top. The lower part of the invert 50 has a curved surface that bulges downward along the bottom surface of the shield tunnel 1.

As shown in FIG. 1, the invert 50 is formed by a plurality of precast inverts 51 arranged in a row in the tunnel axial direction. Each precast invert 51 is a member manufactured in advance in a factory or the like, and is formed of concrete, reinforcing bars, or the like. The tunnel axial length of each precast invert 51 is formed so as to be equal to the tunnel axial length of the ring 10, and each precast invert 51 is arranged so as to correspond to each ring 10.

As shown in FIGS. 1 and 2, the precast invert 51 is a member that covers a portion of the inner wall surface 10b of the ring 10 that is the bottom surface of the shield tunnel 1, and is a member that extends in the tunnel width direction. A curved surface corresponding to the inner wall surface 10b of the ring 10 is formed in the lower portion of the precast invert 51, and can be brought into close contact with the inner wall surface 10b of the ring 10. A horizontal flat surface 51a is formed on the upper part of the precast invert 51. The intermediate wall 30 is placed on the flat surface 51a. The flat surface 51a is provided with a concave metal fitting (hole) 58, which will be described later.

Subsequently, the intermediate wall 30 will be described. The intermediate wall 30 is a wall extending in the tunnel axial direction so as to divide the space formed below the floor slab 20 into the space X and the space Y shown in FIG. 2, and is arranged side by side in the tunnel axial direction. It is formed by a plurality of plate-shaped bodies 31 formed.

Here, each plate-shaped body 31 will be described. The plate-shaped body 31 is arranged on the flat surface 51a above the precast invert 51, and is a plate-shaped member extending upward from the flat surface 51a. One plate-like body 31 is attached to one precast invert 51. Each plate-shaped body 31 is a member manufactured in advance in a factory or the like, and is formed of steel such as concrete and reinforcing bars and a synthetic material.

The plate-shaped body 31 has a main body portion 35, a lower overhanging portion 32, and an upper overhanging portion 33. The main body 35 is a substantially rectangular plate-shaped portion extending in the vertical direction. The lower overhanging portion 32 is a lower portion of the main body portion 35 and overhangs on both sides in the tunnel axial direction. The upper overhanging portion 33 is an upper portion of the main body portion 35 and overhangs on both sides in the tunnel axial direction. As shown in FIG. 3, the shape of the vertical cross section of the plate-shaped body 31 extending in the tunnel axial direction of this example is I-shaped.

The lower overhanging portion 32 has a substantially rectangular parallelepiped shape extending in the direction of the tunnel axis, and is a rectangle having a horizontally extending cross section. Further, a rectangular flat surface perpendicular to the tunnel axis direction is formed at the tip of the lower overhanging portion 32. Further, the upper overhanging portion 33 also has a substantially rectangular parallelepiped shape and a rectangular cross section like the lower overhanging portion 32, and the tip of the upper overhanging portion 33 has a rectangular shape perpendicular to the tunnel axis direction. A flat surface is formed.

The flat surfaces at the tips of the lower overhangs 32 of the plate-shaped bodies 31 adjacent to each other in the tunnel axial direction are directly or indirectly connected to each other. These flat surfaces may be arranged with a gap of, for example, about several cm, and the gap may be filled later with concrete or the like. Similarly, the flat surfaces at the tips of the upper overhanging portions 33 of the adjacent plate-shaped bodies 31 are also connected to each other. Between the tunnel axial directions of the main body 35 of the adjacent plate-shaped bodies 31, the vertical direction is between the upper overhang 33 connected to each other and the lower overhang 32 connected to each other. A rectangular opening 40 extending into is provided. The openings 40 are arranged at intervals in the tunnel axial direction. Here, the interval in the tunnel axial direction corresponds to the length in the tunnel axial direction of the main body 35 of the plate-shaped body 31. The opening 40 is a frontage that allows humans to pass through.

A convex metal fitting (protruding portion) 38 projecting downward is attached to the lower end surface 31a of the plate-shaped body 31, and a concave metal fitting (hole) corresponding to the convex metal fitting 38 is attached to the flat surface 51a above the precast invert 51. Part) 58 is provided. In this example, the convex metal fitting 38 is arranged below the position of the root of the lower overhanging portion 32, as shown in FIG. The plate-shaped body 31 and the precast invert 51 are connected in a state where the convex metal fitting 38 and the concave metal fitting 58 are fitted.

Here, a joint structure composed of the convex metal fitting 38 and the concave metal fitting 58 will be described with reference to FIG. As shown in FIGS. 3 and 4B, the convex metal fitting 38 having the joint structure is partially embedded in the lower part of the plate-shaped body 31, and the concave metal fitting 58 is embedded in the upper part of the precast invert 51. It has been.

As shown in FIG. 4B, the convex metal fitting 38 is a member having a cylindrical shape as a whole, and has an insert portion 38a and a pin bolt 38b. The insert portion 38a is a portion embedded in the embedding hole 38c provided in the lower end surface 31a of the plate-shaped body 31. The pin bolt 38b has a diameter slightly smaller than that of the insert portion 38a and is formed coaxially with the insert portion 38a. A screw thread (not shown) is formed on the outer circumference of the pin bolt 38b. The pin bolt 38b projects downward from the lower end surface 31a of the plate-shaped body 31.

As shown in FIG. 4B, the concave metal fitting 58 has a casing 58a, a backup material 58b, a quadrant piece 58c, a holding ring 58d, and a front lid 58e. The casing 58a is a long member embedded in the upper part of the precast invert 51. The casing 58a is embedded so that the longitudinal direction is perpendicular to the flat surface 51a on the upper part of the precast invert 51. A round hole 58f that opens upward is formed in the upper part of the embedded casing 58a. The backup material 58b is an annular member penetrating the center, and is housed in the bottom of the round hole 58f. The holding ring 58d and the quadrant piece 58c are arranged above the backup material 58b in a state where the quartet piece 58c is housed in the holding ring 58d. A front lid 58e is arranged above the holding ring 58d. A through hole is formed in the center of the front lid 58e.

As shown in FIG. 4A, the pin bolt 38b is in contact with the edge of the through hole of the backup material 58b in a state of penetrating the through hole of the front lid 58e and the quadrant piece 58c. When the pin bolt 38b is inserted, the quadrant piece 58c temporarily retracts downward and expands, whereby the pin bolt 38b is inserted. After insertion, the quadrant piece 58c is pushed between the pin bolt 38b and the holding ring 58d by the backup material 58b, and the screw portion (not shown) formed on the inner surface of the quadrant piece 58c and the pin bolt 38b. By holding down the holding ring 58d with the front lid 58e when the tensile force is generated in the state where the threads of the above are engaged, the quadrant piece 58c and the holding ring 58d are fitted and fastened.

In this joint structure, once the pin bolt 38b is inserted into the concave metal fitting 58, the threaded portion formed on the inner surface of the quadrant piece 58c and the thread of the pin bolt 38b are fixed in a meshed state, so-called 1 It is a joint that can be connected by touch. In such a state, the plate-shaped body 31 and the precast invert 51 are connected.

As shown in FIG. 1, a flat upper end surface is formed on the upper portion of the plate-shaped body 31. On the upper end surface, the longitudinal end portion of the precast floor slab 21 constituting the floor slab 20 is placed.

Subsequently, the floor slab 20 will be described. As shown in FIG. 1, the floor slab 20 is formed by a plurality of precast floor slabs 21 arranged in a row in the tunnel axial direction. Each precast floor slab 21 is a member manufactured in advance in a factory or the like, is formed of concrete, steel, or the like, and has a plate shape extending in the tunnel width direction. The tunnel axial length of each precast floor slab 21 is formed to be equal to the tunnel axial length of the ring 10, and two for each ring 10 arranged in the tunnel axial direction. The precast floor slabs 21 are arranged side by side. The precast floor slabs 21 on one of the left and right sides are arranged so as to form a row in the tunnel axial direction, similarly to the plate-shaped body 31 and the side wall concrete portion 15. That is, the floor slab 20 is composed of two precast floor slab rows.

One longitudinal end of each precast floor slab 21 is placed on the flat surface of the upper surface 15b of the side wall concrete portion 15, and the opposite longitudinal end is placed on the upper end surface of the plate 31. It is connected in the placed state. Although detailed description of the connecting method is omitted, they are connected by anchor bolts 25 and the like (FIG. 2).

The floor slab 20 is designed so as not to cause harmful deformation that impairs safety and durability with respect to an assumed automobile load or crowd load. In addition, it is designed so that fatigue durability is not impaired when the vehicle is repeatedly driven. The road surface is formed by paving the upper surface of the floor slab 20. The pavement is not shown.

Subsequently, the concrete layer 60 will be described. The concrete layer 60 is arranged so as to cover the upper part of the invert 50, and is cast on site after the installation of the plate-shaped body 31 is completed. In FIG. 1, the concrete layer 60 is shown only on the back side in the tunnel axial direction in FIG. 1, and the front side is not shown. As shown in FIG. 3, the lower overhanging portion 32 of each plate-shaped body 31 is embedded by the concrete layer 60. In FIG. 3, only the surface (upper surface) of the concrete layer 60 is virtually shown by the alternate long and short dash line. The concrete layer 60 functions as a part of the invert 50, and the surface (upper surface) of the concrete layer 60 becomes the floor surface of the space X and the space Y divided by the intermediate wall 30 shown in FIG. ..

Subsequently, a procedure for constructing the tunnel internal structure of the present embodiment will be described. First, the shield is excavated in the ground at the tip of the shield machine, and the arc-shaped segment 10a is assembled at the rear in the circumferential direction to construct a lining that supports the excavated cross section while repeating each ring. The tunnel wall part of the tunnel 1 is constructed. Next, the precast invert 51 is installed, and a material / equipment transport vehicle that transports the material / equipment to the following carriage of the shield machine or the shield machine runs on the precast invert 51. After that, the side wall concrete portion 15 is placed behind the trailing carriage that is connected to the shield machine or moves in accordance with the excavation of the shield machine. After that, the pin bolt 38b of the convex metal fitting 38 provided on the lower end surface 31a of the plate-shaped body 31 is fitted into the concave metal fitting 58 provided on the upper part of the precast invert 51, and the plate-shaped body is placed on the upper part of the precast invert 51. 31 are connected.

Next, the precast floor slab 21 is placed on the upper portion of the plate-shaped body 31 and the upper surface portion 15b of the side wall concrete portion 15, and the plate-shaped body 31 and the side wall concrete portion 15 and the precast floor slab are used with anchor bolts 25 or the like. 21 is connected. Finally, the lower part of the plate-like body 31 is buried by the concrete layer 60. As a result, the invert 50 and the intermediate wall 30 are firmly connected.

As can be seen from the above description, in the tunnel internal structure of the present embodiment, an opening 40 is provided between the plate-shaped body 31 constituting the intermediate wall 30 and another plate-shaped body 31 adjacent to each other in the tunnel axial direction. Has been done. That is, the opening 40 is always provided at the position where the plate-shaped body 31 is arranged. Therefore, it is possible to go back and forth between the two spaces (spaces X and Y) divided by the intermediate wall 30 at an arbitrary tunnel axial position in the tunnel.

By providing such an opening 40, one space in which the pipes for facilities installed in the space (spaces X and Y) are divided by the intermediate wall 30 at an arbitrary tunnel axial position. It becomes easy to move from (for example, space X) to the other space (for example, space Y), and workability during the period when the shield tunnel 1 is being constructed is improved. Further, in the case of emergency evacuation, even in a situation where it is necessary to hurry to move from space X to space Y or in the opposite direction, it is possible to move quickly, so that safety performance is also improved.

Further, since the overhanging portions 32 and 33 are provided in a part of the plate-shaped body 31, the weight of each plate-shaped body 31 can be reduced as compared with the rectangular plate-shaped body 31. As a result, it is possible to reduce the burden of the installation work of the plate-shaped body 31 on site.

Further, in the present embodiment, the invert 50 is formed by arranging the precast inverts 51 in a row in the tunnel axial direction. In this structure, after the tunnel wall is formed, the trailing trolley of the shield machine and the equipment transport vehicle run on the upper surface of the invert 50 immediately after the invert 50 is installed without placing concrete or curing. be able to. For example, on the flat surface 51a above the invert 50, a rail or the like for transporting materials or the like can be arranged at the time of tunnel construction, so that the running is more stable than when traveling on the bottom of the ring 10. Is possible.

Further, since the concrete layer 60 covers the upper end of the lower overhanging portion 32, the lower end of the opening 40 is flush with the surface of the concrete layer 60. Therefore, since the floor surface of the space divided by the intermediate wall 30 and the lower end of the opening 40 are flush with each other, it is possible to safely come and go. In addition, it becomes easy to run a small trolley for transportation. Further, during the period when the concrete layer 60 is cast and cured, floorboard construction, fireproof construction, etc. can be performed in parallel, so that the construction period is not affected. Further, even if the precast invert 51 is slightly damaged due to the traveling of the following trolley or the material / equipment transport vehicle, the damage can be repaired by the concrete layer 60 to be cast later.

Further, since the plate-shaped body 31 is connected to the precast invert 51 by fitting the convex metal fitting 38 and the concave metal fitting 58, the work load is reduced, the safety is improved, and the plate-shaped body 31 is formed. Positioning accuracy is also improved.

[Second Embodiment]
Next, the second embodiment according to the present invention will be described with reference to FIG. This embodiment is a modification of the first embodiment (FIGS. 1 to 4), and the same parts or similar parts as those of the first embodiment are designated by the same reference numerals, and duplicate description will be omitted. .. In FIG. 5, the illustration of the invert 50 (precast invert 51) and the like is omitted.

While the plate-shaped body 31 (FIG. 3) of the first embodiment has the main body portion 35, the lower overhanging portion 32, and the upper overhanging portion 33, the plate-shaped body 31 of the present embodiment Has a main body portion 35 and a lower overhanging portion 32, and is not provided with an upper overhanging portion 33, as shown in FIG. Similar to the plate-shaped body 31 of the first embodiment, the lower overhanging portion 32 of the present embodiment is a lower portion of the main body portion 35 and overhangs on both sides in the tunnel axial direction. The shape of the vertical cross section of the plate-shaped body 31 extending in the axial direction in this example is an inverted T-shape.

A flat surface is formed on the upper portion of the plate-shaped body 31 of the present embodiment, and the girder member 39 is arranged on the flat surface. The girder member 39 is a substantially rectangular parallelepiped member extending in the tunnel axial direction, and is formed of a synthetic material with steel such as concrete and reinforcing bars. The cross section of the girder 39 in this example is a rectangle extending horizontally. The dimensions in the depth direction in FIG. 5 are formed so as to be substantially the same as or slightly smaller than the plate-shaped body 31. The girder member 39 is connected to the upper flat surface of each plate-shaped body 31 with anchor bolts or the like.

The girder member 39 is arranged so as to bridge the main body 35 of the plate-shaped bodies 31 adjacent to each other in the tunnel axial direction. A precast floor slab 21 is placed on the upper part of the girder material 39, and although detailed illustration is omitted, the girder material 39 and the precast floor slab 21 are connected by anchor bolts or the like.

By arranging the girder member 39 on the upper part of the plate-shaped body 31 as in the present embodiment, an opening is opened between the girder member 39 and the lower overhanging portion 32 as in the case where the upper overhanging portion 33 is provided. The unit 40 is provided, and the same effect as that of the first embodiment can be obtained.

[Other Embodiments]
The description of the above embodiment is an example for explaining the present invention, and does not limit the invention described in the claims. Further, each part configuration of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

The plate-shaped body 31 of the first embodiment described above is formed so that the shape of the vertical cross section extending in the axial direction is I-shaped, but the present invention is not limited to this. The lower overhanging portion 32 may overhang in one direction in the tunnel axial direction. Similarly, the upper overhanging portion 33 may also overhang in one direction in the tunnel axial direction. For example, as shown in FIG. 6, it may have a U-shape. Further, the plate-shaped body 31 of the second embodiment is formed so that the shape of the vertical cross section extending in the axial direction is an inverted T-shape, but the present invention is not limited to this. For example, as shown in FIG. 7, it may be L-shaped. In this case, the girder member 39 may be arranged as in the second embodiment.

1 Shield tunnel 10 Ring 10a Arc-shaped segment 10b Inner wall surface 15 Side wall concrete 15a Ring connection part 15b Top surface 20 Floor slab 21 Precast floor slab 25 Anchor bolt 30 Intermediate wall 31 Plate-shaped body 31a Lower end surface 32 Lower overhang 33 Upper side Overhang 35 Main body 38 Convex metal fittings (protruding part)
38a Insert 38b Pin Bolt 39 Girder 40 Opening 50 Invert 51 Precast Invert 51a Flat Surface 58 Concave Hardware (Hole)
58a Casing 58b Backup material 58c Quadruple top 58d Holding ring 58e Front lid 60 Concrete layer

Claims (4)

An invert that is placed on the bottom of the tunnel and has a flat surface at the top, an intermediate wall that is placed upright on the invert and extends in the direction of the tunnel axis, and an intermediate wall that extends above the intermediate wall. In the construction method of the tunnel internal structure with the floor slab
A precast invert is installed between the shield machine and the trailing carriage that moves in accordance with the excavation of the shield machine in the tunnel axial direction, or with the trailing carriage, in the direction of the tunnel axis, and further behind the precast. The intermediate wall is installed on the plane of the invert, and the floor slab is installed on the upper part of the intermediate wall.
A method for constructing a tunnel internal structure, which comprises installing the precast invert, the intermediate wall, and the floor slab, and then placing a concrete layer on the precast invert so as to bury the lower portion of the intermediate wall . An invert that is placed on the bottom of the tunnel and has a flat surface at the top, an intermediate wall that is placed upright on the invert and extends in the direction of the tunnel axis, and an intermediate wall that extends above the intermediate wall. In the construction method of the tunnel internal structure with the floor slab
The underground is excavated with a shield machine, segments are assembled at the rear part to construct a lining to support the excavation cross section, and then a precast invert is installed in the direction of the tunnel axis, and the precast invert is installed on the plane of the precast invert. An intermediate wall is installed, and the floor slab is installed on the upper part of the intermediate wall.
After the precast invert, the intermediate wall and the floor slab are installed, a concrete layer is cast on the precast invert so as to bury the lower part of the intermediate wall .
A method for constructing a tunnel internal structure, characterized in that a material / equipment transport vehicle for transporting materials / equipment to the shield machine runs on the precast invert. The intermediate wall is formed by a plurality of plate-like bodies arranged side by side in the direction of the tunnel axis.
The method for constructing a tunnel internal structure according to claim 1 or 2, wherein the plate-shaped body is placed on each of the planes of the precast invert. An invert that is placed on the bottom of the tunnel and has a flat surface at the top, an intermediate wall that is placed upright on the invert and extends in the direction of the tunnel axis, and an intermediate wall that extends above the intermediate wall. With a floor slab,
In the tunnel internal structure in which the space formed below the floor slab is divided by the intermediate wall.
The intermediate wall is formed by a plurality of plate-like bodies arranged side by side in the tunnel axial direction, and the invert is formed by a plurality of precast inverts arranged side by side in the tunnel axial direction, and the plane of the precast invert is formed. The plate-shaped body is placed on each of the above.
A concrete layer for burying the lower part of each plate-like body is cast on each of the precast inverts.
The wall portion of the tunnel is formed by a plurality of rings arranged side by side in the direction of the tunnel axis.
A tunnel internal structure, characterized in that the tunnel axial length of the precast invert and the tunnel axial length of the ring are set to be the same.