JP2002309895A - Joining structure for large-sectional tunnel segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining structure and method for large-sectional tunnel segments, which is improved in joining strength between a concrete structure and steel segment rings. SOLUTION: According to the joining structure and the joining method for the large-sectional tunnel segments, an upper cut-away front end 10a or a lower cut-away front end 10b of the steel segment ring 7a is mounted on a segment lower portion support surface 22a of a cogging portion 22 formed at a front end of each of a top board and a bottom board 12 of the concrete structure 11, and a joint plate 16 which is an upper cut-away front end surface of the steel segment 7 is abutted on a cushioning member 23 embedded in a segment cut-away end abutting surface 22b of the cogging portion 22. Then, the joint plate 16 is implanted in each of the top board and the bottom board 12, and an anchor bar 24 penetrating the cushioning member 23 is inserted into the joint plate 16, followed by clamping a fixing nut 27 at a front end screw portion of the anchor bar 24, whereby the upper cut-away front end 10a of the steel segment 7 is joined to each of the top board and the bottom board 12 in one body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a lining structure for a tunnel having a large cross section such as a road tunnel by a shield method, in which a top plate constituting a ceiling wall of a concrete structure and a bottom plate constituting a floor surface are provided. And a joining structure with the large section tunnel segment.

[0002]

2. Description of the Related Art Conventionally, at a branch point such as a highway running through a tunnel, a plurality of roads such as an up lane and a down lane or a plurality of lanes having different destinations once merge in the tunnel, and both roads run together for a while. After that, it is built to diverge and travel in each direction. The tunnel cross section at the junction of the entrance and exit of such a road tunnel must be a large cross section.

[0003] Such a large-section tunnel is often constructed by a conventional excavation method. On the other hand, in the shield method, tunnels with various cross-sectional shapes, tunnels with large cross-sections, and the like have been constructed due to advances in design and construction techniques. However, when constructing a tunnel with a complicated and large cross section, the following method is used, that is, a method of simply increasing the diameter of one shield tunnel, so that adjacent shield tunnels partially overlap with each other. A method of constructing a long tunnel with a large cross section by excavating in parallel to each tunnel and excavating multiple shield tunnels at intervals, after which a large number of supports are installed between both tunnels There is a method of constructing a tunnel with a large cross section long by excavating the ceiling, constructing a ceiling using flat segments, and communicating with both shield tunnels.

Further, there is a method of constructing a large-section road junction tunnel shown in FIG. In this method, a plurality of shield tunnels 6 are excavated in the ground 4 at intervals while constructing segment rings 7a by constructing the segments 7 and constructing tunnel inner walls. Thereafter, excavation is performed between the two tunnels, a part of the segment ring 7a is cut off, a concrete structure 11 having a substantially character shape is constructed between the two shield tunnels 6, and a top slab 12 forming a ceiling wall of the concrete structure 11 is formed. And the cut end portion 10a of the cut portion 10 of the segment ring 7a is joined and integrated with a top plate or bottom plate flange portion concrete. In this way, the tunnel ceiling is constructed by the top plate 12 of the concrete structure 11 having a substantially character shape, the tunnel partition wall 1 is constructed by the vertical web, and the up lane (or the inner lane) 2a and the down lane (or the outer lane) are formed on both sides. 3) A road 3 having 2b is constructed.

[0005]

SUMMARY OF THE INVENTION The present invention is an improvement on the above method. That is, in the conventional construction method, since the joint between the top plate or the bottom slab 12 of the substantially man-made concrete structure 11 and the cut end 10a of the segment ring 7a is rigidly joined, a large bending moment is applied to the segment near the joint. And the strength of the segment is insufficient.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joining structure and a joining method for a large section tunnel segment which has solved the above-mentioned problems.

[0007]

SUMMARY OF THE INVENTION In order to advantageously solve the above-mentioned conventional problems, the present invention is configured as follows.

According to a first aspect of the present invention, a vertical wall or a pillar forming a tunnel partition wall or an outer wall, and a top plate and a floor forming a ceiling wall are provided between a plurality of shield tunnels each having a segment formed on an inner wall surface. A concrete structure consisting of a bottom slab is constructed, and a side of the segment ring in contact with the concrete structure is cut out over a predetermined range, and a large-section tunnel in which the cut end portion is joined to the top plate and the bottom plate. In the above, at the tip of the top plate and the bottom plate, a jaw portion receiving a shearing force acting on the joint portion is provided, and the cut end portion of the segment is placed on the segment lower support surface of the jaw portion, and the joining is performed. The jaws are embedded in the abutment of the segment cut edge to transmit the compressive axial force acting on the joint and buffer the rotational moment of the joint. After the cut end surface of the segment is brought into contact with the cushioning member, the anchor plate is implanted in the top plate and the bottom plate, and the anchor streaks penetrating the buffer member are inserted through the joint plate at the cut end portion of the segment. The fixing nut is fastened to the threaded end of the segment, and the top and bottom plates and the cut end of the segment are integrated.

According to a second aspect of the present invention, in the joint structure between the cut end portion of the segment and the top plate and the bottom plate of the concrete structure according to the first invention, the segment lower support surface of the jaw is eliminated. The front end contact surface of the cushioning member forms the outer surface of the top end of the top plate and the bottom plate, and is implanted on the top plate and the bottom plate, and an anchor streak that penetrates the cushioning member is cut off at the tip of the segment. And the fixing nut is fastened to the threaded end of the anchor streak, and the top and bottom plates and the cut end of the segment are integrated.

According to a third aspect of the present invention, in the first or second aspect, the fixing nut is used to buffer a bending force acting on a joint structure between the cut end portion of the segment and the top plate and the bottom plate of the concrete structure. It is configured to be fastened to the joint plate side via a spring member.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the buffer member is formed of a water-stopping elastic member such as rubber.

[0012]

According to the present invention, in a large-section tunnel, a vertical wall or column forming a tunnel partition wall or an outer wall is provided;
The joint between the concrete structure having the top slab forming the ceiling wall and the bottom slab forming the floor surface, the cutout end of the segment ring is connected to a jaw portion subjected to a shear force acting on the joint portion, and the compressive axial force is transmitted. And a combination of all or a plurality of members such as a buffer member that absorbs rotation of the joint and a screw member that fits into the anchor bar that absorbs transmission of bending force to the anchor bar. By fastening the fixing nut to the tip screw portion of the concrete structure, the joint portion between the tip of the top plate of the concrete structure and the segment which receives the largest vertical load from above and the segment can be firmly joined and integrated. Further, by providing a jaw portion at the tip of the top plate and the bottom plate and fastening the fixing nut via a spring member, the joint strength between the top plate and the bottom plate tip and the segment is further improved. Further, by forming the cushioning member from the water-stopping elastic member, the water-stopping of the joint can be made perfect.

[0013]

Next, the present invention will be described in detail based on the illustrated embodiment.

FIGS. 1 to 3 are sectional explanatory views showing a construction process of a large-section tunnel in which the present invention is implemented in three stages.
4 to 7 and FIGS. 8 to 11 show Embodiments 1 and 2 of the present invention.
FIG. 3 is an enlarged cross-sectional view of each part showing a joint between a substantially-shaped concrete structure in the large-section tunnel and a steel segment forming an inner wall of the shield tunnel.

1 to 3, FIG. 3 shows a completed state of the large-section tunnel 9. As shown in FIG. In the tunnel 9 having a large cross section, the inside of the tunnel is partitioned by an intermediate partition wall 1, and one of both sides of the intermediate partition wall 1 is defined as an up lane (or inward) 2 a and the other is defined as a down lane (or outward) 2 b. 3 shows a merging point at the entrance and exit of a road tunnel along which the road 3 travels.

The steps for constructing a large-section tunnel will be described with reference to the drawings. As shown in FIG. 1, at predetermined intervals,
Two rows of retaining walls 5 (some of which are shown by two-dotted lines) are cast in the underground 4, and the shield excavator is excavated while cutting each retaining wall 5 so that a predetermined interval is provided. 2 away
Rows of shield tunnels 6 are constructed in parallel (first step). In this case, the excavation is performed so that the center of the shield tunnel 6 and each retaining wall 5 are aligned. A steel segment 7 is constructed on the inner wall of each shield tunnel 6 (the structure of the steel segment 7 will be described later).

Next, as shown in FIG. 1, a position connecting the lower ends of both shield tunnels 6 with a straight line is defined as an excavated bottom surface 8.
Excavation is performed on the upper side from the excavation bottom surface 8 and inside the both retaining walls 5. By excavating in this way, a part of the steel segment rings 7a of both shield tunnels 6 is exposed from underground.

Next, a part of the left and right steel segment rings 7a exposed in this manner is cut off as indicated by a two-dot chain line (hereinafter, this is referred to as a cut portion 10). Thereafter, as shown in FIG. 2, a concrete structure 11 having a predetermined length along the longitudinal direction of the tunnel is constructed at an intermediate position between the two steel segment rings 7a with a substantially man-shaped cross section. The vertical web portion of the concrete structure 11 serves as a middle partition wall 1 of the tunnel, and the top plate 12 serves as a ceiling wall of the middle portion of the tunnel.
The upper excision tip 10a is the jaw 2 of the top plate tip 12a.
2 and both members are joined via a connecting member such as an anchor bar 24. The bottom plate 13 serves as a bottom plate in the middle of the tunnel, and the lower cut end portion 10b of the cut portion 10 of the steel segment ring 7a is placed on the jaw portion 22 at the tip end of the bottom plate. Both members are joined. In the subsequent steps, the road 3 is constructed, and the excavated portion above the concrete structure 11 is backfilled (see FIG. 3).

The tip 12a of the top plate 12 of the concrete structure 11 and the cutout 1 of the steel segment ring 7a
Since the joining structure and the joining method with 0 are the main parts of the present invention, each embodiment shown in FIGS. 4 to 11 will be described in order.

In the first embodiment shown in FIGS. 4 to 7, the upper cut end portion 10a of the cut portion 10 of the steel segment ring 7a shown schematically is replaced with a concrete structure 11.
To be placed on the top plate 12, the tip 12a of the top plate 12
Is provided with a jaw portion 22 configured such that a segment lower support surface 22a and a segment cut edge contact surface 22b have a substantially L-shaped cross section.

Lower segment support surface 22a of jaw 22
Is the upper cut end 10a of the steel segment ring 7a.
The mounting surface is provided on a slightly inclined mounting curved surface so that the lower surface can be mounted in surface contact. The segment cut edge contact surface 22b is formed by a front surface of a cushioning member 23 made of a square rubber block embedded in the top plate 12, and
The contact surface 22b is formed at the same inclination angle as the joint plate 16 so that the joint plate 16 at the inclined position of the upper excision distal end portion 10a can make surface contact.

The tip end 12a of the top plate 12 has a cushioning member 23
An anchor streak 24 penetrating therethrough is embedded, and the base end of the anchor streak 24 is screwed to an anchor frame 25 made of H-shaped steel or the like embedded in concrete 26 of the top plate 12 with a bolt / nut 14. . Further, a fixing nut 27 is fastened to the threaded portion at the tip of the anchor bar 24.

On the other hand, the steel segment 7 in the steel segment ring 7a includes a main girder 15, a joint plate 16 fixed to both ends of the main girder 15, a vertical rib 19 bridged between the main girder 15, The skin plate 20 fixed to the outer edges of the two main girders 15 is formed as a steel shell.

The steel segments 7 are connected by inserting connecting bolts 17 into bolt holes of the joint plates 16 (FIG. 4).
). The steel segment rings 7a are also connected by substantially similar known connecting means. Therefore, the cut portion 10 in the steel segment ring 7a disengages the connecting bolt 17 from the bolt hole of the joint plate 16 in each segment arranged at the position shown by the dotted line in FIG. Formed along the tunnel axis direction. (See FIG. 1).

In the above configuration, the top plate 12
The lower surface of the upper cut end portion 10a of the steel segment ring 7a is placed on the lower segment support surface 22a of the jaw portion 22, and the joint plate 16 as the upper cut end surface is brought into contact with the segment cut end edge of the cushioning member 23. An anchor streak 24 that abuts against and projects from the abutment surface 22b
And the fixing nut 27 is fastened to the threaded portion at the tip of the anchor streak 24. Between the joint plate 16 and the fixing nut 27, a coil spring is
A spring member 29 such as a disc spring is fitted, and by fastening the fixing nut 27, in addition to the fastening force of the fixing nut itself, the joint plate 16 is attached to the cushioning member 23 by the elastic force of the spring member 29. Pressing more strongly, thus the anchor streaks 24
, The concrete structure 11 and the steel segment ring 7a can be firmly connected and integrated.

At the joint between the concrete structure 11 and the steel segment ring 7a, a shear force in the direction of arrow (a), a compressive axial force in the direction of arrow (b), and a bending force in the direction of arrow (c) are applied. However, since the lower surface of the upper cut end portion 10a of the steel segment ring 7a is placed on the lower support surface 22a of the segment of the jaw 22, it can strongly resist the shearing force in the direction of the arrow (a). Further, since the cushioning member 23 and the joint plate 16 are in pressure contact with each other by surface contact, the joint can rotate, so that the bending force in the direction of the arrow (c) becomes small, and strong resistance can be achieved. Also, a spring member 29 is attached to the anchor muscle 24.
Is fitted, it is possible to absorb the bending force in the direction of the arrow (c) and connect the anchor muscle 24 so that the bending moment is not transmitted, and it is not necessary to reinforce the anchor muscle 24. Further, the fixing nut 27 is fastened to the anchor bar 24, and the cushioning member 23 and the joint plate 16 are pressed against each other by surface contact, so that the cushioning member 23 can receive a compressive axial force in the direction of the arrow (b). Further, since the cushioning member 23 is a water-stopping elastic member such as rubber, the water stoppage at the joint between the concrete structure 11 and the steel segment ring 7a is also perfect.

As described above, according to the first embodiment, the joint between the top plate 12 of the concrete structure 11 and the upper excision tip 10a of the steel segment ring 7a is fixed to the jaw 22, the buffer member 23, the anchor bar 24, and the fixing member. Since it is composed of the nut 27, the spring member 29, and the like, the joint between the tip end 12a of the top plate 12 and the segment ring 7a, which receives the largest vertical load from above, can be firmly joined and integrated. It is possible to eliminate the fear of division.

8 to 11 show a second embodiment of the present invention. In the drawings, the same elements as those of the first embodiment are denoted by the same reference numerals, and the description thereof will not be repeated. The following description focuses on differences from the first embodiment.

In the second embodiment, the jaw portion 22 in the first embodiment, that is, the segment lower support surface 22a
This is a configuration that eliminates the above. Therefore, Embodiment 2
Here, the front surface of the cushioning member 23, that is, the segment cut edge contact surface 22 b forms the outer surface of the top end of the top plate 12. Then, similarly to the first embodiment, the anchor bar 2 fixed to the anchor frame 25 embedded in the top plate 12
4 penetrates the buffer member 23, and a fixing nut 27 is screwed into a threaded portion at the tip.

Also in the second embodiment, the joint between the top plate 12 of the concrete structure 11 and the upper cut end 10a of the steel segment ring 7a is formed by the cushioning member 23, the anchor bar 24, the fixing nut 27, and the spring member. 29, etc., the top plate 12 which receives the largest vertical heavy load from above
The joint between the tip 12a and the segment ring 7a can be firmly joined and integrated, and the possibility of breakage or division of the joint can be eliminated, and the waterproofness at the joint is perfect.

In the case of the second embodiment, as in the first embodiment, the upper cut tip 10 of the steel segment ring 7a is used.
Since there is no jaw portion 22 on which a is placed, the structure is correspondingly simplified as compared with the first embodiment. On the other hand, since there is no jaw portion 22, the strength is inferior to the shearing force applied to the joint portion as compared with the first embodiment, but if reinforcement is necessary for this reason, the diameter of the anchor bar 24 is increased, Streak 2
This can be dealt with by increasing the number of four. Which of the first and second embodiments is applied may be appropriately selected according to the conditions for implementing the large-section tunnel for implementing the present invention.

[0032]

The present invention having the above-described configuration has the following effects.

According to the present invention, in a large-section tunnel, a joint structure between a concrete structure having a vertical web serving as a tunnel partition wall and a top plate serving as a ceiling wall and an upper cut end of a segment ring is provided as a top plate. Abuts the joint plate at the cut end of the segment against the buffer member embedded in the base plate, inserts the anchor bar implanted in the top plate and the bottom plate through the member, and fastens the fixing nut to the threaded portion of the anchor bar tip. Therefore, the joint portion between the tip of the top plate and the bottom plate of the concrete structure that receives the largest vertical heavy load from above and the steel segment can be strongly and integrally joined with a simple configuration. Further, by providing a jaw portion at the tips of the top plate and the bottom plate and fastening the fixing nut via a spring member, the joint strength between the top plate and the bottom plate and the steel segment is further improved. Further, by forming the cushioning member from a water-stopping elastic member such as rubber, the water-stopping of the joint can be made perfect.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a first construction step of a large-section tunnel in which the present invention is implemented.

FIG. 2 is an explanatory sectional view of a second construction step of a large-section tunnel in which the present invention is implemented.

FIG. 3 is an explanatory sectional view of a third step of constructing a large-section tunnel in which the present invention is implemented.

FIG. 4 is an enlarged cross-sectional view showing a joint structure between an upper flange plate of a substantially engine-shaped concrete structure and a steel segment constituting an inner wall of a shield tunnel as the first embodiment.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a sectional view taken along line CC of FIG. 4;

FIG. 8 is an enlarged cross-sectional view showing a joint structure between a substantially man-shaped concrete structure and a steel segment constituting an inner wall of a shield tunnel as a second embodiment.

FIG. 9 is a sectional view taken along the line DD in FIG. 8;

FIG. 10 is a sectional view taken along the line EE of FIG. 8;

FIG. 11 is a sectional view taken along line FF of FIG. 8;

FIG. 12 is an explanatory sectional view showing a conventional large-section tunnel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Partition wall 2a Up lane 2b Down lane 3 Road 4 Underground 5 Retaining wall 6 Shield tunnel 7 Steel segment 7a Steel segment ring 8 Excavation bottom surface 9 Large section tunnel 10 Cut part 10a Upper cut tip 10b Lower cut tip 11 Concrete Structure 12 Top Plate 12a Tip of Top Plate 13 Bottom Plate 14 Bolt / Nut 15 Concrete 16 Joint Plate 17 Connecting Bolt 18 Main Girder 19 Vertical Rib 20 Skin Plate 21 Flange End Position 22 Jaw 22a Segment Lower Support Surface 22b Segment Cutting Edge contact portion 23 Buffer member 24 Anchor bar 25 Anchor frame 26 Concrete 27 Fixed nut 28 Bolt hole 29 Spring member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor J. Toshima 20-1 Shintomi, Futtsu-shi, Nippon Steel Corporation Technology Development Division F-term (reference) 2D055 AA02 BB10 GC02 GC09

Claims (4)

[Claims] 1. A part of a segment constituting a wall surface of a shield tunnel is removed, and a vertical wall or a pillar which forms a tunnel partition wall or an outer wall made of reinforced concrete or reinforced steel concrete outside the shield tunnel and a ceiling wall are formed. A concrete structure comprising a top plate and a bottom plate forming a floor surface is constructed, and a side of the segment ring in contact with the concrete structure is cut out over a predetermined range, and the remaining portion of the shield tunnel and the concrete are removed. In a tunnel having a large cross section formed by joining structures, a jaw portion is provided at a tip of the top plate forming a ceiling wall and a bottom plate forming a floor surface, the jaw portion receiving a shearing force acting on the joint portion. Placing the cut end of the segment on the lower support surface of the segment, In order to transmit the compressive axial force acting on the segment and to absorb the rotational moment of the joint, the cut end surface of the segment is brought into contact with a buffer member embedded in the segment cut end edge contact portion of the jaw, and the top plate An anchor stud implanted in the bottom plate and penetrating the cushioning member is passed through the joint plate at the cutting end of the segment, and a fixing nut is fastened to a tip thread portion of the anchor streak, and the top plate and the bottom plate The junction structure of the large section tunnel segment, wherein the cutting end of the segment is integrated with the segment. 2. A joint structure between a cut end portion of a segment and a top plate and a bottom plate of the concrete structure according to claim 1, wherein a lower support surface of a segment of the jaw is eliminated, so that a front end contact of the cushioning member is provided. The contact surface forms the outer surface of the top end of the top plate and the bottom plate, and is implanted in the top plate and the bottom plate, and an anchor streak that penetrates the cushioning member is inserted into the joint plate at the cutting end of the segment. In addition, a joint structure for a large-section tunnel segment, wherein a fixing nut is fastened to a tip thread portion of an anchor bar, and a cut-off tip portion of the top plate and a bottom plate and the segment are integrated. 3. The fixing nut is fastened to a joint plate side via a spring member in order to buffer a bending force acting on a joint structure between a cut end portion of the segment and a top plate and a bottom plate of the concrete structure. The joint structure for a segment for a tunnel having a large cross section according to claim 1 or 2, wherein the joint is configured. 4. The joining structure for a large-section tunnel segment according to claim 1, wherein the cushioning member is made of a water-stopping elastic member such as rubber.