JP2013002141A - Structure of lining wall of large-section tunnel - Google Patents

Structure of lining wall of large-section tunnel Download PDF

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Publication number
JP2013002141A
JP2013002141A JP2011134360A JP2011134360A JP2013002141A JP 2013002141 A JP2013002141 A JP 2013002141A JP 2011134360 A JP2011134360 A JP 2011134360A JP 2011134360 A JP2011134360 A JP 2011134360A JP 2013002141 A JP2013002141 A JP 2013002141A
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Prior art keywords
lining
tunnel
strength
concrete
general
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JP2011134360A
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Japanese (ja)
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Yukio Yabe
幸男 矢部
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Shimizu Corp
清水建設株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a structure of a lining wall of a large-section tunnel which is suitably applied to construction of a large-section tunnel.SOLUTION: A lining wall 1 is formed by integrally connecting a plurality of small tunnels 5 constructed at intervals along an outline of the large-section tunnel to be constructed. The lining wall comprises a general part 1a which is formed on a reinforced concrete structure and a high-strength part 1b which is formed of a steel-concrete composite structure having a steel plate 10 with a dowel and concrete 13 united and has higher flexural capacity than that of the general part. At the high-strength part, an inner surface and/or an outer surface of the lining wall may be only formed of the steel plate with the dowel. When the lining wall is formed in a flat-section shape and both side parts thereof have a smaller radius of curvature than that of an upper part and a lower part, both the side parts may be only formed of high-strength parts into a steel-concrete composite structure.

Description

  The present invention relates to a structure of a lining wall in a large section tunnel, and more particularly to a structure of a lining wall suitable for application to a large section tunnel having a flat sectional shape.

As a construction method suitable for construction of a large-section tunnel, an underground cavity construction method shown in Patent Document 1 (hereinafter referred to as a conventional construction method) is known.
For example, when constructing a large section tunnel with a diameter of about 40 m, for example, a large number of small tunnels with a diameter of about 4 m (for example, about 16) are preliminarily constructed and the small tunnels are connected together. For example, after constructing a strong reinforced concrete lining wall with a wall thickness of about 2.5 m, the basic construction is to excavate the inside of the lining wall and build a large-section tunnel. Since it is possible to excavate the ground while stably supporting the ground with a small tunnel and lining wall, it is effective when applied to the construction of a large-section tunnel such as a branching junction in a road tunnel on soft ground Is something.

JP 2008-156907 A

By the way, as is well known, the tunnel is more structurally stable as the cross-sectional shape is nearly circular (that is, the curvature of each part is uniform), but the tunnel cross-sectional shape is almost flat due to various constraints. In many cases, there is no choice but to.
In the case of a tunnel with a flat cross-sectional shape, the radius of curvature of each part of the lining wall is not uniform, so compared to a region with a large curvature radius and a gently curved surface (hereinafter referred to as a gently curved portion) Since a large bending moment is generated locally in a region with a small curvature radius and a sharply curved surface (hereinafter referred to as a sharply curved portion), it is necessary to design a lining wall in a tunnel with a flat section. It is usual to set the wall thickness and the required bar arrangement amount so as to ensure the bending strength at the sharply curved portion.

This also applies to the case where a large cross-section tunnel having a flat cross-sectional shape is to be constructed by the above-described conventional method, and in this case also, the required wall thickness of the entire lining wall is ensured to have a bending strength at the sharply curved portion. Therefore, it is necessary to make the diameter of the small tunnel sufficiently large in order to construct a lining wall of such a large wall thickness. Since a large cost is required for the construction of a small tunnel, the conventional method is not always reasonable in that respect.
In addition, if the lining wall is made of ultra high strength concrete, the required wall thickness can be reduced compared with the case of a general reinforced concrete structure, and therefore the diameter of the small tunnel should be minimized. This is not impossible, but in that case too much expensive ultra-high-strength concrete is required, so a great increase in cost is inevitable. It is not preferable and not very realistic.

  From the above, although the conventional method shown in Patent Document 1 is effective as a method for constructing a large section tunnel, when constructing a large section tunnel with a flat cross section, due to structural limitations at the sharply curved portion It was also difficult to apply, and there was room for improvement.

  In view of the above circumstances, an object of the present invention is to provide a structure of a lining wall suitable for application to a large-section tunnel.

  The invention according to claim 1 is a structure of a lining wall in a large-section tunnel, and the lining wall integrally includes a plurality of small tunnels constructed at intervals along the outline of the large-section tunnel to be constructed. The lining wall is formed by a general part formed of a reinforced concrete structure and a steel / concrete composite structure in which a steel plate with a bevel and concrete are integrated, and more than the general part. It consists of a high-strength part excellent in bending strength.

  The invention according to claim 2 is the structure of the lining wall in the large-section tunnel according to claim 1, wherein the high-strength portion in the lining wall is provided with an inner surface and / or an outer surface of the lining wall with the diver. It is formed by a steel plate.

  The invention according to claim 3 is the structure of the lining wall in the large section tunnel according to claim 1 or 2, wherein the lining wall is a flat structure in which the curvature radius at both sides is smaller than the curvature radius at the upper part and the lower part. It has a cross-sectional shape, and both side portions of the lining wall are the high-strength portions.

According to the structure of the lining wall of the present invention, only a portion requiring higher strength than the general portion is formed as a high strength portion by a steel / concrete composite structure instead of a normal reinforced concrete structure. Therefore, the required strength can be secured sufficiently and without hindrance while the required wall thickness is made equal to that of the general part.
Therefore, according to the structure of the lining wall of the present invention, when constructing a large section tunnel by constructing a lining wall in a form in which a number of previously constructed small tunnels are connected together, the diameter dimension of the small tunnel is set. It is possible to rationally construct the entire lining wall without having to make it unnecessarily large, and without having high-strength parts being over-tightened or using special concrete such as ultra-high-strength concrete. .

It is a figure which shows the structure of the lining wall which is embodiment of this invention. It is a figure which shows a construction procedure same as the above. It is a figure which shows other embodiment same as the above.

FIG. 1 shows the structure of a lining wall according to an embodiment of the present invention.
The lining wall 1 of this embodiment is constructed by a conventional construction method shown in Patent Document 1 with a large cross-section tunnel 2 having a flat cross section as a branching junction between the main tunnel 3 and the lamp tunnel 4.
That is, the lining wall 1 of this embodiment is constructed by first constructing a large number (16 in the illustrated example) of small tunnels 5 at intervals along the contour of the large-section tunnel 2 to be finally built. It is constructed by connecting the small tunnels 5 together, but the entire cross-sectional shape of the large cross-section tunnel 2 is slightly flat in the vertical direction, and both sides are located above the upper and lower curvature radii. The radius of curvature is small.

  That is, in the lining wall 1 of the present embodiment, the upper part and the lower part are gently curved parts having a large curvature radius, but both side parts are steeply curved parts having a smaller curvature radius than the upper part and the lower part. Since a larger bending moment is generated at the steeply curved portions on both sides than the gently curved portions at the upper and lower portions, it is necessary to increase the bending strength.

  Therefore, the lining wall 1 of the present embodiment has an upper and lower gentle curved portions as a general portion 1a, which is formed by a normal reinforced concrete structure, but the suddenly curved portions on both sides are the above-mentioned general portions (slowly curved portions). ) As a high-strength portion 1b that is superior in bending strength to 1a, it is formed of a steel / concrete composite structure that provides higher strength than a normal reinforced concrete structure, and thereby a required wall at the high-strength portion (steeply curved portion) 1b. The bending proof stress is increased while keeping the thickness equal to that of the general part (slowly curved part) 1a.

  Specifically, the high-strength portion 1b in the lining wall 1 of the present embodiment is a steel plate with a gibber provided with a gibber 11 on the inner surface as shown in FIGS. 2 (a) to 2 (c) together with the construction procedure. 10 are arranged opposite to each other with a distance corresponding to the required wall thickness, and if necessary, both gibbled steel plates 10 are connected to each other by an appropriate stiffener 12 such as an H-shaped steel and then driven in. Formed by structurally integrating the steel plate 10 with concrete and the concrete 13 via the gibber 11 by placing and filling the concrete 13 (ordinary concrete is sufficient) into the interior of the die frame. Has been.

According to the lining wall 1 having the above-described structure, a high-strength portion made of a steel / concrete composite structure is used instead of a normal reinforced concrete structure in place of a portion that requires higher strength (high bending strength) than the general portion 1a. Since it was formed as 1b, the required strength can be secured sufficiently and without hindrance while the required wall thickness is made equal to that of the general portion 1a.
Therefore, when the large-section tunnel 2 having a flat cross-sectional shape is constructed by the conventional method shown in Patent Document 1, the structure of the present embodiment is adopted as the structure of the lining wall 1 so that the small tunnel 5 to be constructed in advance is used. It is not necessary to increase the diameter of the wall more than necessary, the steeply curved part (high-strength part 1b) does not need to be over densely arranged, and there is no need to use special concrete such as ultra-high-strength concrete. The whole 1 can be reasonably constructed at low cost.

  Of course, in order to construct the lining wall 1 described above, it is basically possible to follow the conventional construction method shown in Patent Document 1 as it is. First, as shown in FIG. After the general part (slowly curved part) 1a is formed by a normal reinforced concrete structure, the high strength part (steeply curved part) 1b on both sides is made of steel / concrete so as to pass over the upper part as shown in (b) Since the upper general part (slowly curved part) 1a may be formed with a normal reinforced concrete structure so as to be formed by a structure and then passed over to the upper part as shown in (c), the upper and lower general parts 1a Needless to say, the high-strength portions 1b on both sides can be easily and inexpensively constructed by simple work without requiring any complicated process or procedure.

  From the above, according to the present invention, the conventional method shown in Patent Document 1 that was conventionally difficult to apply when constructing a tunnel with a flat cross-sectional shape is a large cross-section with a flat cross-sectional shape. When constructing a tunnel, it can be widely applied also when constructing a large section tunnel with various cross-sectional shapes.

  In addition, although it is preferable that the high-strength portion 1b has a structure in which both the inner surface and the outer surface of the lining wall 1 that becomes a sharply curved portion are formed by the steel plate 10 with a gibber as in the above-described embodiment, this is not necessarily the case. In short, it is only necessary to form a high-strength portion 1b of a steel / concrete structure having a desired strength at a necessary place. But it ’s okay.

  Further, if necessary, for example, as shown in FIG. 3, it is conceivable to reinforce the high-strength portion 1b by further reinforcing the reinforcing concrete 14 integrally. In that case, as shown in the figure at the time when the high-strength portion 1b is constructed, the inner ground is preliminarily excavated, and the reinforcing concrete 14 is added to the inner surface of the lining wall 1 from the inside.

1 Lining wall 1a General part (slow curve part)
1b High-strength part (steeply curved part)
2 Large section tunnel 3 Main tunnel 4 Lamp tunnel 5 Small tunnel 10 Steel plate with gibber 11 Gibber 12 Stiffener 13 Concrete 14 Reinforced concrete

Claims (3)

  1. The structure of the lining wall in a large section tunnel,
    The lining wall is formed by integrally connecting a plurality of small tunnels constructed at intervals along the outline of the large-section tunnel to be built,
    The lining wall is composed of a general part formed by a reinforced concrete structure and a high-strength part that is formed by a steel / concrete composite structure in which a steel plate and concrete with a gibber are integrated and is superior in bending strength to the general part. The structure of the lining wall in the large section tunnel characterized by this.
  2. The structure of the lining wall in the large-section tunnel according to claim 1,
    The high-strength portion of the lining wall is a structure of a lining wall in a large-section tunnel, wherein an inner surface and / or an outer surface of the lining wall is formed by the steel plate with a gibber.
  3. The structure of the lining wall in the large section tunnel according to claim 1 or 2,
    The lining wall has a flat cross-sectional shape in which the curvature radii at both sides are smaller than the curvature radii at the top and bottom, and both sides of the lining wall are the high-strength portions. The structure of the lining wall in the cross section tunnel.
JP2011134360A 2011-06-16 2011-06-16 Structure of lining wall of large-section tunnel Pending JP2013002141A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106437760A (en) * 2016-07-20 2017-02-22 中铁二院工程集团有限责任公司 Large-section tunnel novel multi-layer lining structure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05248182A (en) * 1992-03-09 1993-09-24 Sumitomo Metal Ind Ltd Composite segment
JP2000145385A (en) * 1998-11-17 2000-05-26 Nippon Steel Corp Segment made of steel
JP2007217910A (en) * 2006-02-15 2007-08-30 Shimizu Corp Underground cavity construction method and tunnel construction method
JP2008075386A (en) * 2006-09-22 2008-04-03 Ohbayashi Corp Spectacle shield tunnel structure and method of constructing same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05248182A (en) * 1992-03-09 1993-09-24 Sumitomo Metal Ind Ltd Composite segment
JP2000145385A (en) * 1998-11-17 2000-05-26 Nippon Steel Corp Segment made of steel
JP2007217910A (en) * 2006-02-15 2007-08-30 Shimizu Corp Underground cavity construction method and tunnel construction method
JP2008075386A (en) * 2006-09-22 2008-04-03 Ohbayashi Corp Spectacle shield tunnel structure and method of constructing same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106437760A (en) * 2016-07-20 2017-02-22 中铁二院工程集团有限责任公司 Large-section tunnel novel multi-layer lining structure

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