JP2000136697A - Segment and tunnel lining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a segment and a tunnel lining method wherewith economy, labor-saving and safety in execution of work can be achieved. SOLUTION: Works for primary lining are executed with a plurality of steel segments 6 arranged at the inner circumference of a tunnel which is under construction, and a plurality of reinforcing steel materials 11 are arranged at the inside of each of the steel segments 6 with concrete placed therein, and the inner circumference of the tunnel is lined with the secondary lining comprising of the reinforcing steel materials 11 and concrete. On this occasion, the reinforcing steel materials 11 are fixed temporarily at the inside of the steel segment 6, and the reinforcing steel materials 11 are separated from the steel segment 6 after the steel segment 6 is arranged at the inner circumference of the tunnel and arranged at specified positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary lining by installing a plurality of segments in the ground of a tunnel, installing a plurality of reinforcing steel materials inside the segments, and pouring concrete to reinforce. The present invention relates to a tunnel lining method for lining the ground of a tunnel by performing secondary lining with steel and concrete, and a segment used in this method.

[0002]

2. Description of the Related Art Generally, in a shield method, for example, FIG.
As shown in (a) and (b), the tunnel A is excavated by a shield machine (not shown), and at the same time, the segment 30 is assembled at the tail of the shield machine to cover the ground surface of the tunnel immediately after excavation. .

[0003] In particular, when a secondary lining is required for reasons such as strength and water stoppage, a reinforcing steel bar, a reinforcing steel material 31 or the like is provided inside a segment 30 provided as a primary lining material. A lining body 33 having a composite structure of steel and reinforced concrete is formed by installing as a working material and then casting concrete 32 and performing secondary lining.

By the way, the applicant heretofore has constructed a rectangular or circular outer shell portion 34 having a rectangular or circular shape, as shown in FIGS. 14 (a) and 14 (b). A large section tunnel construction method (hereinafter referred to as “MMST method”) for constructing a large section tunnel A by excavating earth and sand in the outer shell portion 34 has been developed, and several applications have been already made for this MMST method.

[0005] In this case, the outer shell portion 34 first excavates while lining a single-section shield tunnel a (hereinafter referred to as "simple tunnel a") with a segment 30, and then connects the single tunnels a with each other. A part or all of the partition part b (such as a skin plate of a segment installed in this part) is removed to form one continuous space, and a reinforcing steel material 31 such as a reinforcing steel or a steel material is secondarily covered in the continuous space. It is constructed as a composite material of steel and reinforced concrete by installing concrete 32 and then casting concrete 32.

The segment 30 provided as the primary lining material here is, for example, a steel segment as shown in FIG.
The steel segment 30 extends in parallel with a plurality of main girders 35 in the circumferential direction of the unitary tunnel a, and a plurality of longitudinal ribs 36 are attached between the main girders 35 at predetermined intervals in the axial direction of the main girder 35. Further, a skin plate 37 is provided on the ground side of these members.
Is formed. In addition, reinforcing steel and reinforcing steel 3
At the time of secondary lining, 1 is newly loaded into the tunnel and assembled.

[0007]

However, according to the conventional shield method, when the secondary lining with the reinforcing steel material 31 and the concrete 32 is performed inside the steel segment 30 incorporated as the primary lining, the reinforcing steel or the reinforcing steel material is used. Not only is it necessary to newly carry in 31 as a secondary lining material, but also because it is necessary to assemble these reinforcing steel materials 31 in a very narrow space, not only is it difficult to work but also dangerous work In many cases, and there were safety issues.

Further, when a large-section tunnel is constructed by the MMST method, the section stress (the stress acting on the lining material due to surrounding earth pressure, water-soil pressure, or the like) differs between a single tunnel and a large-section tunnel. Therefore, it is necessary to superimpose the stresses when designing the stress, and as a result, especially at the connection portion of the lining member, it is often necessary to use a member larger than that required for each tunnel cross section. However, while it is necessary to carry a large amount of secondary lining material (reinforcing steel) such as steel bars and steel, and to reinforce it, many of these secondary lining materials have large diameters and extremely heavy weight. Due to the large number, there was a risk that carrying-in and installation would be extremely difficult or impossible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a segment and a tunnel lining method which enable economical construction, labor-saving construction, and safe construction.

[0010]

According to a first aspect of the present invention, there is provided a tunnel lining method according to the present invention, in which a plurality of segments are installed in a tunnel and a primary lining is performed. When installing a plurality of reinforcing steel materials inside the inside, and casting concrete and performing secondary lining with reinforcing steel material and concrete and lining the tunnel, temporarily reinforcing the reinforcing steel material inside the segment beforehand After the segment is installed on the inner periphery of the tunnel, the reinforcing steel material is cut off from the segment and installed at a predetermined position.

The segment according to the second aspect is a segment used in the tunnel lining method according to the preceding paragraph, wherein a plurality of reinforcing steel materials are temporarily provided as a secondary lining material inside the segment installed as the primary lining material. Fix it.

According to a third aspect of the present invention, in the second aspect, the reinforcing steel material is temporarily fixed inside the segment with a plurality of temporarily fixed vertical ribs. According to a fourth aspect of the present invention, in the second aspect, the reinforcing steel material is temporarily fixed to the inside of the segment by welding.

According to a fifth aspect of the present invention, in the second aspect, the reinforcing steel material is temporarily fixed inside the segment with a temporary fixing bracket.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of the Invention 1 to 4
Shows an example of a segment and a tunnel lining method according to the present invention, and in the figure, a middle main girder 1 and an outer main girder 2 located on both sides thereof in a circumferential direction of a tunnel A to be lining are installed in parallel, Joint plates 3 are provided between the ends of the adjacent middle main girder 1 and the plurality of outer main girder 2 respectively.

Further, a skin plate 5 is mounted on the ground side of these members, and thus a steel segment 6 installed as a primary lining material on the ground of the tunnel A has a rectangular plate shape elongated in the circumferential direction of the tunnel A. Is formed.

Each of the main main girder 1, the outer main girder 2 and the joint plate 3 is formed in a strip shape with necessary beam formation (height) and thickness. The girder 2 is designed as a bending material (beam) that resists the sectional force of the tunnel A (stress due to earth pressure or water pressure from the surroundings).

The joint plate 3 has sufficient strength against the compressive force and the tensile force acting in the circumferential direction of the tunnel A, and obtains the propulsive force of a shield machine (not shown) that excavates the tunnel A. It is formed with a sufficient thickness and beam structure so as to have a sufficient strength as a force receiver.

A bolt hole 8 for fastening a joint bolt 7 for joining steel segments 6 adjacent to each other in the axial direction of the tunnel A is formed in the outer main girder 2. A bolt hole 10 for fastening a joint bolt 9 for joining the steel segments 6 adjacent to each other is formed, and a reinforcing steel material 11 installed as a secondary lining material to be described later is passed through the joint plate 3. Are formed.

Since the joint plate 3 receives a reaction force for obtaining the propulsive force of the shield machine, if the joint plate 3 has the through-hole 12 from the beginning, the strength (rigidity) due to the cross-sectional defect is inevitably reduced.
The through holes 12 may be formed later.

A reinforcing steel material 11 is attached to both sides of the middle main girder 1 (or both sides of the middle main girder 1 and the inner side of the outer main girder 2) formed in this way, and the reinforcing steel material 11 includes a plurality of reinforcing steel materials. It is temporarily fixed by a temporary vertical rib 13 so that it can be easily removed.

The reinforcing steel material 11 is provided as a reinforcing steel frame material in the concrete 14 when the concrete 14 is further cast inside the steel segment 6 provided as the primary lining material and the secondary lining is performed. A plurality of bolt holes 15 are formed at both ends of a steel material such as an I-shaped steel, an I-shaped steel, an H-shaped steel, a reinforcing steel bar, a reinforcing steel basket, etc. Is formed.

When a reinforcing bar or a reinforcing bar cage is installed as a reinforcing steel material, a male screw portion or a rib portion is provided at an end portion of the reinforcing bar so that the reinforcing bars can be mechanically connected to each other with a nut-shaped coupler or the like. ing.

As the nut-shaped coupler, in addition to a long nut in which a male screw portion formed at the end of the reinforcing bar is simply screwed and connected, a male screw portion is inserted and then crimped to a male screw portion or a rib portion. There is a connection method in which a male screw portion or a rib portion is inserted and then a mortar or a resin mortar is filled around the external screw portion and connected.

The temporary vertical ribs 13 are formed as a set of two pieces, and are provided at predetermined intervals between the outer main girder 2 and the reinforcing steel material 11 in a V-shape on the reinforcing steel material 11 side. In this manner, the reinforcing steel material 11 as the secondary lining material is temporarily fixed to both sides of the middle main girder 1 (or both sides of the middle main girder 1 and the inside of the outer main girder 2) so as to be easily removed.

If the two temporary vertical ribs 13 are connected by the connecting bolts 4, the inclination of the temporary vertical ribs 13 changes when the connecting bolts 4 are tightened or loosened. The reinforcing steel material 11 can be securely and firmly temporarily fixed by strongly pressing the reinforcing steel material 11 on both sides of the steel 1, and the installation interval between the middle main girder 1 and the outer main girder 2 can be easily coped with.

Next, a method of lining a tunnel with the steel segments 6 in such a configuration will be described. First, in the tail of the shield machine, a plurality of steel segments 6 are placed one by one in the ground of the tunnel A being dug while adjoining each other in the circumferential direction and the axial direction. At the same time, the steel segments 6 adjacent to each other in the circumferential direction of the tunnel A and the steel segments 6 adjacent to each other in the axial direction of the tunnel A are fastened to the bolt holes 10 of the joint plate 3 by the fastening bolts 9. The fastening bolts 7 are fastened to the bolt holes 8 and joined to each other. In this way, the ground of the tunnel A is primarily covered with the plurality of steel segments 6. Next, when the excavation proceeds to some extent and the vertical ribs no longer receive the shield thrust, the connecting bolts 4 are loosened, the temporary vertical ribs 13 are removed, and the reinforcing steel material 11 of each steel segment 6 is removed.
To be able to move freely. Then, the reinforcing steel material 11 of each steel segment 6 is moved in the axial direction of the tunnel A to a position having the through hole 12. The temporary vertical ribs 13 are used repeatedly.

When the steel cement 6 is installed downward, the reinforcing steel material 11 drops when the temporary vertical ribs 13 are removed. For example, as shown in FIG. It is preferable to attach a fall prevention member 16 extending between the outer main girders 2 on both sides in a direction perpendicular to the axis of the main girder.

The fall prevention member 16 is made of, for example, a reinforcing steel bar or a steel strip, and is attached at predetermined intervals in the axial direction of the main girder by welding to the ends of the middle main girder 1 and the outer main girder 2 on both sides. Next, the reinforcing steel material 11 of each steel segment 6 is appropriately moved in the circumferential direction of the tunnel A, and the end is moved to one joint plate 3.
From the through hole 12 of the other joint plate 3
2 and the reinforcing steel material 1 adjacent in the circumferential direction of the tunnel A
The end portions 1 are abutted against each other in the circumferential direction of the tunnel A. Next, joining plates 17 are attached to both sides or one side between the ends of the reinforcing steel material 11, and the bolt holes 15 formed at the ends of the reinforcing steel material 11 and the joining plates 17 formed corresponding to the bolt holes 15 are provided. Bolt 1 in bolt hole 18
9, the reinforcing steel materials 11 are joined to each other.

In this manner, the reinforcing steel material 11 temporarily attached as a secondary lining material to each steel segment 6 is cut off from the steel segment 6 and connected in a ring shape in the circumferential direction of the tunnel A. The reinforcing steel material 11 connected in a ring shape
Are placed inside the steel cement 6 at predetermined intervals in the axial direction of the tunnel A. Next, the concrete 14 is placed inside the steel segment 6.
And the concrete 1
4 to complete the secondary lining.

In particular, the MM shown in FIGS.
In the ST method, each single tunnel a is constructed by the following steps. At this time, at the connection part b between the single tunnels a, a, both the single tunnels a are connected to the connection part b.
Are projected from the through-holes 12 of the joint plate 3 and their ends are abutted to each other.

Then, the ends of the reinforcing steel material 11 at the connection portion b are joined to each other by the joining plate 17 and the joint bolt 9. At that time, since the reinforcing steel material 11 moves freely, a considerable amount of displacement between the single tunnels a can be easily absorbed, and the single tunnels a can be easily connected to each other.

In this way, the reinforcing steel material 11 temporarily attached as a secondary lining material to each steel segment 6 is cut off from the steel segment 6 and connected in a ring shape in the circumferential direction of the large-section tunnel A.

Further, the reinforcing steel materials 11 are installed inside the steel cement 6 at predetermined intervals in the axial direction of the tunnel A and doubly. In addition, after removing a partition portion (a main girder, a skin plate, and the like installed at this portion) of a connection portion b between the unitary tunnels a, a plurality of unitary tunnels a are formed into a continuous space, and then the space is inserted into this space. Concrete 14 is cast. Thus, the outer shell 34 of the steel / concrete composite structure as shown is constructed.

The other structure is substantially the same as the conventional MMST method. Embodiment 2 of the Invention FIG. 5 shows another example of the steel segment according to the present invention. In particular, a reinforcing steel material 11 installed as a secondary lining material is provided with a plurality of vertical ribs 20 instead of the temporary vertical ribs 13 for the middle main girder 1. Temporarily fixed to both sides (or both sides of the middle main girder 1 and the inside of the outer main girder 2).

The vertical rib 20 is formed to have a substantially L-shaped cross section so as to have sufficient strength (rigidity) as a reaction force receiver for obtaining the propulsive force of the shield machine that excavates the tunnel A, and extends in the circumferential direction of the tunnel A. They are installed at optimal intervals.

The vertical ribs 20 are attached to the reinforcing steel material 11, the outer main girder 2 and the skin plate 5 by welding. At this time, the vertical ribs 20 do not need to be continuously welded to the reinforcing steel material 11, the outer main girder 2 and the skin plate 5, and may be welded at predetermined intervals unless there is any particular problem in strength. Other configurations are substantially the same as those shown in FIGS.

In such a configuration, when the periphery of the longitudinal rib 20 is gas-cut at the time of lining the tunnel A, the reinforcing steel material 11 can be freely moved while being separated from the steel segment 6. Can be installed as a secondary lining material.

When the peripheral edge of the vertical rib 20 is gas-cut, a part of the vertical rib 20 is left on the side of the outer main girder 2, the skin plate 5 and the reinforcing steel material 11, and concrete to be cast later is cut. 14 may be used as a shear connector for increasing the adhesive force. Embodiment 3 of the Invention FIGS. 6 (a) and 6 (b) show another example of the steel segment according to the present invention. In particular, the reinforcing steel material 11 and the joining plate 17 are substantially centered between the middle main girder 1 and the outer main girder 2 on both sides. The part is temporarily fixed by a plurality of vertical ribs 20.

The vertical ribs 20 are provided at substantially central portions thereof with the reinforcing steel material 11.
A notch (not shown) having a width large enough to allow insertion of the reinforcing steel material 11 and the joining plate 17 into the notch and joining the peripheral edge to the middle main girder 1 and the outer main girder. 2
And the skin plate 5 are welded to each other.

In this way, the reinforcing steel material 11 is made up of the plurality of vertical ribs 2.
It is temporarily fixed by 0. Other configurations are substantially the same as those shown in FIGS. In such a configuration, the reinforcing steel material 11 and the joining plate 17 are separated from the steel segment 6 by gas cutting the peripheral edge of the vertical rib 20 when lining the tunnel A, and a secondary lining material is provided at a predetermined position. Install.

FIG. 6B shows an example of a case where the formation (height) of the reinforcing steel material 11 and the joining plate 17 is particularly large. In this case, the joint plate 3 and the longitudinal rib 20 have upper end portions. Is formed, a reinforcing steel material 11 and a joining plate 17 are inserted into the notched portion, and the peripheral edge of the notched portion is temporarily fixed to the reinforcing steel material 11 and the joining plate 17 by welding. Embodiment 4 of the Invention FIGS. 7 to 11 show another example of the steel segment according to the present invention. In particular, the steel cement 6 is provided between the middle main girder 1 and the outer main girder 2 on both sides to attach the reinforcing steel material 11. Are provided at predetermined intervals, and notches 21 and 22 are formed on the joint plate 3 and the vertical rib 20 so that the reinforcing steel 11 can be inserted. The cutouts 21 and 22 are formed on both sides of the reinforcing steel 11. The vertically extending fixing rib pieces 23 are provided at predetermined intervals in the axial direction of the reinforcing steel material 11.

The notch 21 of the joint plate 3 is formed to be slightly wider and gradually widen from the upper end. The notch 22 of the vertical rib 20 is also the notch 2
As in the case of 1, the reinforcing steel material 11 is formed slightly wider so that a portion having the fixing rib piece 23 can be inserted.

The reinforcing steel material 11 is inserted into the cutouts 21 and 22 in the steel cement 6 thus formed, and is temporarily fixed by the temporary fixing brackets 24 and 25. The temporary fixing bracket 24 includes a bolt receiving seat 24a provided at the upper end of the notch 21 and a moving bracket 24b provided in the notch 21 on both sides of the reinforcing steel material 11, respectively.
And a temporary fixing bolt 24c that passes through the bolt receiving seat 24a and is screwed to the moving bracket 24b. The outside of the moving bracket 24b is formed obliquely in correspondence with the side of the notch 21.

In such a configuration, the temporary fixing bolt 2
4c, the moving bracket 24b is guided by the side of the notch 21 and rises while moving toward the reinforcing steel member 11, so that the end of the reinforcing steel member 11 is moved to the moving bracket 24 on both sides.
b and can be temporarily fixed.

The temporary fixing bracket 25 has a substantially L-shaped cross section corresponding to the shape of the vertical rib 20 and the fixing rib piece 23, and is attached to both sides between the vertical rib 20 and the fixing rib piece 23. And two L-shaped brackets 25a
And a plurality of connecting bolts 25b for connecting the V-shaped bracket 25a.

In such a configuration, the connecting bolt 25
b, the two L-shaped fittings 25a are drawn toward each other, so that the ends of the vertical ribs 20 and the fixed rib pieces 23 are strongly sandwiched between the two L-shaped fittings 25a. Part can be temporarily fixed.

As the temporary fixing bracket 25, for example, FIG.
As shown in (c), instead of the L-shaped fitting, two plate-shaped fittings (plates) may be used.
The intermediate portion of the reinforcing steel material 11 may be temporarily fixed using a set.

Although the joint plate 3 and the vertical rib 20 have notches 21 and 22, respectively, they receive a large propulsion reaction force when the shield machine excavates the tunnel. Metal fitting 2 in notch 21
4b (see FIG. 11 (a)), and the vertical rib 20 is particularly problematic because the two L-shaped fittings 25a function as stress transmitting members in the notch 22 (see FIG. 10 (a)). There is no.

In this case, the L-shaped bracket 25a and the notch 22
When the concave and convex portions that mesh with each other are formed on the peripheral edge of the L-shaped bracket 25a, the function of the stress transmitting member in the cutout portion 22 of the L-shaped bracket 25a can be further enhanced. Other configurations are shown in FIGS.
Are substantially the same as those shown in FIG.

Next, a method of lining a tunnel with the steel segments 6 in such a configuration will be described. First, in the tail of the shield machine, a plurality of steel segments 6 are placed one by one in the ground of the tunnel A being dug while adjoining each other in the circumferential direction and the axial direction. At the same time, the steel segments 6 adjacent to each other in the circumferential direction of the tunnel A and the steel segments 6 adjacent to each other in the axial direction of the tunnel a are fastened to the bolt holes 10 of the joint plate 3 by the fastening bolts 9. The fastening bolts 7 are fastened to the bolt holes 8 and joined to each other. In this way, the inner periphery of the tunnel A is primarily covered with the plurality of steel segments 6. Next, the temporary fixing bolt 24c of the temporary fixing metal 24 and the connecting metal 25b of the temporary fixing metal 25 are each loosened to separate the reinforcing steel material 11 from the steel segment 6 so as to freely move. After removing the temporary fixing brackets 24 and 25,
It is used repeatedly.

When the steel cement 6 is installed downward, if the temporary fixing bolts 24c and the connecting bolts 25b are loosened, the reinforcing steel material 11 will fall.
As in the case shown in (b), a fall prevention member 16 is attached between the middle main girder 1 and the outer main girder 2 on both sides. Next, the reinforcing steel material 11 of each steel segment 6 is appropriately moved in the circumferential direction of the tunnel A, and the end is pulled out from the notch 21 of the joint plate 3 or inserted into the joint plate 3 from the notch 21. Then, the ends of the reinforcing steel materials 11 adjacent in the circumferential direction of the tunnel A are butted against each other. Next, a joining plate 17 is attached to both sides or one side between the ends of the reinforcing steel material 11, and a joint bolt 19 is fastened to a bolt hole 15 of the reinforcing steel material 11 and a bolt hole 18 of the joining plate 17 to join the reinforcing steel materials 11 to each other. Are joined together.

In this manner, the reinforcing steel material 11 temporarily attached as a secondary lining material to each steel segment 6 is cut off from the steel segment 6 and connected in a ring shape in the circumferential direction of the tunnel A. The reinforcing steel material 11 connected in a ring shape
Are placed inside the steel cement 6 at predetermined intervals in the axial direction of the tunnel A. Next, the concrete 14 is placed inside the steel segment 6.
And the concrete 1
4 to complete the secondary lining.

After the construction, the vertical ribs 20 and the fixed rib pieces 2
Reference numeral 3 has an excellent function as a shear connector for increasing the adhesion of concrete 14 to be cast later. Embodiment 5 of the Invention FIG. 12 shows another example of the steel segment according to the present invention. In particular, the steel cement 6 has a through hole through which the end of the reinforcing steel material 11 can be inserted into the joint plate 3 for mounting the reinforcing steel material 11. Notch 2 instead of 12
6 is formed at a predetermined depth. The notch 26 is formed slightly wider.

The reinforcing steel material 11 is inserted into the notch 26 of the joint plate 3 at both ends thereof, and the temporary fixing blocks 27 are provided on both sides of the reinforcing steel material 11 of the notch 26 in the steel segment 6 thus formed. The longitudinal ribs 20 are provided and temporarily fixed between the reinforcing steel material 11 and the middle main girder 1 and the outer main girder 2, respectively.

At this time, the vertical ribs 20 are welded to the reinforcing steel material 11, the middle main girder 1, the outer main girder 2 and the skin plate 5, respectively, and the temporary fixing block 27 is fixed to the joint plate 3 by welding. Other configurations are substantially the same as those shown in FIGS.

In such a configuration, the longitudinal ribs 20 and the temporary fixing blocks 27 are cut off by gas when lining the tunnel A, whereby the reinforcing steel material 11 is separated from the steel segments 6 and installed as a secondary lining material. Can be.

When the vertical ribs 20 are cut by gas, a substantially intermediate portion of the vertical ribs 20 is cut to form the reinforcing steel member 11 and the middle main girder 1.
By leaving a part of the vertical rib 20 on the side of the outer main girder 2, it is preferable to form a shear connector that increases the adhesive force of the concrete 14 to be cast later.

[0058]

The present invention has the above-described structure,
In particular, a reinforcing steel material as a secondary lining material is temporarily fixed in advance inside the segment installed as the primary lining material with temporary fixing vertical ribs and temporary fixing metal fittings, and after the segment is installed on the inner periphery of the tunnel Since the reinforcing steel material is separated from the segment during the secondary lining and installed at a predetermined position, it is not necessary to carry a large amount of secondary lining material into the tunnel, and economical construction and labor-saving construction can be achieved. effective.

Further, since there is no troublesome and dangerous work, construction safety can be improved.

[Brief description of the drawings]

1A is a perspective view of a steel segment, and FIG. 1B is a cross-sectional view of the steel segment.

FIG. 2 is a perspective view showing an installed state of a steel segment.

3A is a sectional view of a tunnel having a steel-concrete composite structure, and FIG. 3B is a sectional view taken along the line II-II in FIG.

4A is a cross-sectional view of a large-section tunnel constructed by the MMST method, FIG. 4B is a cross-sectional view of a roll line in FIG. 4A, and FIG.

FIG. 5 is a perspective view of a steel segment.

6A is a perspective view of a steel segment, and FIG. 6B is a cross-sectional view thereof.

FIG. 7 is a perspective view of a steel segment.

FIG. 8 is a perspective view of a steel segment.

FIG. 9 is a perspective view of a steel segment.

10A is a partial plan view of the steel segment shown in FIG. 7, and FIG. 10B is a sectional view thereof.

11 (a) is an end view of the steel segment shown in FIG. 7, and (b) and (c) are partial cross-sectional views thereof.

FIG. 12 is a partial perspective view of a steel segment.

13A is a partial perspective view of a conventional tunnel having a steel-concrete composite structure, and FIG. 13B is a cross-sectional view taken along the line II-II in FIG.

FIG. 14A is a cross-sectional view of a large-section tunnel constructed by a conventional MMST method, and FIG. 14B is a cross-sectional view taken along a roll line in FIG.

FIG. 15 is a perspective view of a conventional steel segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Middle main girder 2 Outer main girder 3 Joint plate 4 Connecting bolt 5 Skin plate 6 Steel segment 7 Joint bolt 8 Bolt hole 9 Joint bolt 10 Bolt hole 11 Reinforcement steel (secondary lining material) 12 Through hole 13 Temporary vertical rib 14 Concrete 15 Bolt hole 16 Fall prevention member 17 Joint plate 18 Bolt hole 19 Joint bolt 20 Vertical rib 20a Notch 21 Notch 22 Notch 23 Fixing rib piece 24 Temporary fixing metal 24a Bolt receiving seat 24b Moving metal 24c Temporary fixing bolt 25 Temporary fixing bracket 25a L-shaped bracket 25b Connecting bolt 26 Notch 27 Temporary fixing block

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Yamanaka 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Yoshifumi Matsumoto 4-51 Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Address Kashima Construction Co., Ltd. Yokohama Branch (72) Inventor Takahiro Aoyagi 4-51 Otacho, Naka-ku, Yokohama-shi, Kanagawa Prefecture Kashima Construction Co., Ltd. Yokohama Branch F-term (reference) 2D055 BA01 BB03 CA01 CA03 DA00 KB04 KB05 KB11

Claims (5)

[Claims] 1. A plurality of segments are installed in a tunnel to perform primary lining, a plurality of reinforcing steel materials are installed inside the segments, and concrete is cast to perform secondary lining with reinforcing steel materials and concrete. In the tunnel lining method of performing a tunnel lining, a reinforcing steel material is temporarily fixed inside the segment, and after the segment is installed in the tunnel, the reinforcing steel material is cut off from the segment and installed in a predetermined position. A tunnel lining method. 2. A plurality of segments are installed in a tunnel to perform primary lining, a plurality of reinforcing steel materials are installed inside the segments, and concrete is cast to perform secondary lining with the reinforcing steel materials and concrete. A segment used in a tunnel lining method to be performed, wherein a reinforcing steel material is temporarily fixed inside the segment. 3. The reinforcing steel material is temporarily fixed inside the segment with a plurality of temporarily fixed vertical ribs.
The described segment. 4. The segment according to claim 2, wherein the reinforcing steel material is temporarily fixed inside the segment by welding. 5. The segment according to claim 2, wherein the reinforcing steel material is temporarily fixed inside the segment with a temporary fixing bracket.