JPH11173098A - Construction method of large section tunnel and segment therefor - Google Patents

Construction method of large section tunnel and segment therefor

Info

Publication number
JPH11173098A
JPH11173098A JP9345559A JP34555997A JPH11173098A JP H11173098 A JPH11173098 A JP H11173098A JP 9345559 A JP9345559 A JP 9345559A JP 34555997 A JP34555997 A JP 34555997A JP H11173098 A JPH11173098 A JP H11173098A
Authority
JP
Japan
Prior art keywords
tunnel
shield
shield tunnel
segment
outer shell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9345559A
Other languages
Japanese (ja)
Inventor
Hiroyuki Kawaguchi
Hiroshi Kazama
Takashi Kuhara
Kazuo Miyazawa
Shinji Seki
Osamu Urata
高志 久原
和夫 宮沢
博行 川口
修 浦田
伸司 関
広志 風間
Original Assignee
Shimizu Corp
清水建設株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shimizu Corp, 清水建設株式会社 filed Critical Shimizu Corp
Priority to JP9345559A priority Critical patent/JPH11173098A/en
Publication of JPH11173098A publication Critical patent/JPH11173098A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a tunnel with a large section in which a subsequent shield tunnel can be easily constructed when a plurality of shield tunnels are superposed to form the tunnel having a large section, and also provide segments favorably used therefor. SOLUTION: Segments having a double-structure constituted of an external crust which can be cut by a shielding excavator and an internal crust formed in a relatively higher strength compared with the external crust, are used as segments positioned at a second shielding tunnel no side, in segments constituting a first shielding tunnel 15 when the first shielding tunnel 15 is constructed. And further, when the second shielding tunnel 16 is superposed on the first shielding tunnel 15 to construct the tunnel, the external crust of the segments are excavated together with the natural ground between the first shielding tunnels 15.

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 tunnel having a large cross section suitable for constructing a tunnel having a large cross section, and a segment used for the method.

[0002]

2. Description of the Related Art As is well known, a shield construction method of excavating a ground with a shield excavator and constructing a tunnel having substantially the same diameter as the shield excavator behind the excavator is often used for construction of a tunnel. However, in the shield method, if a tunnel having a large cross section is to be constructed, naturally, the shield excavator used for the tunnel becomes large. It becomes bulky.

For this reason, in recent years, by constructing a large number of small-diameter tunnels along the shape of a large-section tunnel,
A construction method for forming a large-sized tunnel structure from these small-diameter tunnels has been developed.

FIG. 6 shows an example in which a large section tunnel is constructed by the above construction method. A large-section tunnel 1 shown in FIG. 6 has a tunnel structure 3 formed by arranging a plurality of circular small-diameter tunnels 2, 2,.

[0005] The tunnel structure 3 is a small-diameter tunnel 2, 2,.
a, 2a,... between each other, the following small diameter tunnel 2b, 2
are superimposed on a part of the preceding small-diameter tunnels 2a, 2a,... and are constructed later, whereby the whole of the small-diameter tunnels 2, 2,.

When constructing the tunnel structure 3,
First, as shown in FIG. 7, the small-diameter tunnels 2 and
, The leading small-diameter tunnels 2a, 2a,... Are pre-constructed at predetermined intervals, and then the ground G and the leading small-diameter tunnels 2a, 2a, 2a, 2a, 2a,. By excavating a part of the backfill part 5 of the following, as shown in FIG.
Are superimposed on the preceding small diameter tunnels 2a, 2a,.

[0007] Thereafter, the leading small diameter tunnels 2a, 2a, ... and the following small diameter tunnels 2b, 2b, ...
By excavating the ground located inside the tunnel structure 3 made of and forming a space therein, the large-section tunnel 1 is completed.

[0008]

However, in the conventional method of constructing a large-section tunnel as described above,
The following problems exist. That is, in the preceding small-diameter tunnels 2a, 2a,..., The backfill 5 is excavated, so that the thickness of the backfill 5 is larger than that of a general shield tunnel. It must be formed, which makes its construction very difficult.

At this time, in order to surely suppress deformation of the ground, it is necessary to sufficiently develop the strength of the backfill material, and to backfill the tail void generated between the shield excavator and the segment. Due to the concern that there may be a problem with the filling properties of the material, etc., when blending backfill concrete, we always try to design a safe side. As a result, the strength of the backfill portion 5 may be higher than necessary. In this case, it becomes rather difficult to excavate the trailing small-diameter tunnels 2b, 2b,.

On the contrary, since the backfill material is cast on site, the backfill portion 5 may be insufficient in strength. In this case, the leading small diameter tunnels 2a, 2a,
.. And the subsequent small diameter tunnels 2b, 2b,...

The present invention has been made in view of such circumstances, and when a plurality of shield tunnels are superimposed to form a large-section tunnel, a part of a previously constructed shield tunnel is excavated well. A method of constructing a large-section tunnel that does not cause a strength problem at the overlap portion between the shield tunnel constructed earlier and the shield tunnel constructed later, and such a large section An object is to provide a segment suitable for use in constructing a tunnel.

[0012]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is,
The method for constructing a large-section tunnel according to claim 1, wherein a plurality of first shield tunnels are pre-constructed at intervals from each other using a plurality of shield excavators so as to surround a construction target position of the tunnel in the ground. After that, the ground between these first shield tunnels adjacent to each other is excavated with a shield excavator, and hereafter the second shield tunnel is constructed with the first shield tunnel overlapped with the subsequent shield tunnel Thereby, a tunnel structure in which the first and second shield tunnels are alternately arranged to surround a construction target position of the tunnel in the ground is constructed, and thereafter, the inside of the tunnel structure is formed. By excavating and forming a space here, it is configured to construct a tunnel having a large cross section, and when constructing the first shield tunnel, Among the segments constituting the first shield tunnel, the outer shell portion which can be cut by a shield excavator and the outer shell portion are formed with higher strength as those located on the second shield tunnel side. Using a dual structure consisting of an inner shell part,
When the second shield tunnel is constructed by overlapping the first shield tunnel, the outer shell of the segment is excavated together with the ground between the first shield tunnels.

[0013] With the above configuration, in the method of constructing a large-section tunnel, the strength of the outer shell of the segment can be maintained at a predetermined value.

[0014] The segment according to claim 2 includes:
After the first shield tunnel is pre-constructed, the first shield tunnel is adjacent to the first shield tunnel, and the second shield tunnel is superimposed on the first shield tunnel. And a segment forming at least a part of the first shield tunnel, which is used to construct a large-section tunnel having a second shield tunnel, and is formed to be cuttable by a shield excavator. Characterized in that it has a double structure in which an outer shell portion and an inner shell portion formed with higher strength than the outer shell portion are laminated.

If the first shield tunnel is constructed using the above-described segments, when constructing the second shield tunnel, the outer shell of the segment is excavated together with the ground to form the first and second shield tunnels. It is possible to join shield tunnels.

According to a third aspect of the present invention, there is provided the segment according to the second aspect, wherein at least a cut portion of the outer shell is formed of unreinforced concrete.

Due to the above configuration, in this segment, when excavating the second shield tunnel, a part of the first shield tunnel (the outer shell portion of the segment) is excavated well. be able to.

According to a fourth aspect of the present invention, there is provided the segment according to the second or third aspect, wherein the inner shell is formed of precast concrete.

[0019] In this segment, since the precast concrete is manufactured with high strength in this segment, the inner shell thereof can exhibit sufficient structural strength. .

The segment according to a fifth aspect is the segment according to the second or third aspect, wherein the inner shell portion is made of steel.

[0021] With the above configuration, the inner shell of the segment can exhibit sufficient structural strength.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram illustrating a cross section of a large-section tunnel 10 built in the ground G. FIG. As shown in the figure, a large-section tunnel 10 is a tunnel structure 1 which is a lining body for resisting earth pressure from the surrounding ground G.
1 and an internal space 12 formed inside the tunnel structure 11.

The tunnel structure 11 has side walls 11a on both sides positioned substantially in a vertical plane, and these side walls 11a.
The upper surface 11a and the lower surface 11c are provided between the upper end and the lower end of the a and 11a, respectively, and are located in a substantially horizontal plane.

As shown in the figure, the tunnel structure 11 includes first shield tunnels 15, 15,... Provided between the side walls 11a, 11a and the upper surface 11b or the lower surface 11c. First shield tunnel 1
., The side wall portions 11a, 11a,
The second shield tunnel 16, which is a main part of the upper surface 11b and the lower surface 11c, is configured.
These first and second shield tunnels 15, 15, ...
Are arranged alternately in the circumferential direction and are integrated.

As shown in the figure, the first shield tunnel 15 has a precast concrete portion 15a formed in a substantially rectangular shape in cross section, and second shield tunnels 16, 16 of the precast concrete portion 15a. Are arranged on the surface located on the side of..., And are provided with unreinforced concrete portions 15b, 15b,... Integrated with the precast concrete portions 15a, 15a,. The plain concrete portion 15b is formed from a material that can be easily cut by a cutter or the like of a shield excavator, while the precast concrete portion 15a is made of a material having a higher strength than the plain concrete portion 15b. Is formed.

On the other hand, the second shield tunnel 16 is configured to have a rectangular cross section, and the side surfaces 16a, 16a extending in the longitudinal direction of the rectangle have tunnel structures 11a and 16b.
Side walls 11a, 11a and upper surface 11b, lower surface 11c
And the end faces 16b, 16b extending in the short side direction of the rectangle are fitted into the unreinforced concrete portion 15b of the second shield tunnel 15.
The first shield tunnel 15 is formed such that one side dimension is larger than the dimension of the end face 16 b of the second shield tunnel 16.

The main structure of the large-section tunnel 10 has been described above. Next, a method of constructing the large-section tunnel 10 will be described. When constructing the large section tunnel 10, first,
As shown in FIG. 2, a large-section tunnel 1 in the ground G
The first shield tunnels 15, 15,... Are constructed in advance using a plurality of shield excavators so as to surround the zero construction target position R.

FIG. 3 is a diagram showing the details of the structure of the first shield tunnel 15 to be constructed at this time. As shown in the figure, the first shield tunnel 15 is formed by combining a plurality of segments S, S,.

Of the segments S, S,..., Which are arranged so as to face the ground G a side outside the installation target position R of the large-section tunnel 10, the whole is formed of precast concrete. segment S 1 is used. Meanwhile, the first shield tunnel 15, 1
5, the segment located natural ground G b side located between ... has a inner shell part 18 formed by precast concrete, the double structure formed by laminating an outer shell 19 made of unreinforced concrete segment S 2 is used.

[0030] Such segments S 1, S 1, ... and the segments S 2, S 2, ... by the combined is used, the segments S 1, S 1, ... and the segment S 2,
The inner shell portions 18, 18,... Of S 2 ,.
Are formed, and the outer shell portions 19, 1 of the segments S 2 , S 2 ,.
9,... Are formed to form the plain concrete portion 15b.

Further, FIG. 4 is a diagram showing the details of a segment S 2 structure. As shown in the figure, the segment S 2
Are fixed to the plastic precast plate 20 constituting the inner shell part 18 by plastics bolts 21 and
A concrete plate 22 made of plain concrete is joined by using 1,. Further, in the precast plate 20 and the concrete plate 22, plastics inserts 23, 23,... Are provided on the plate surfaces 20a and 22a located on the inner side of the first shield tunnel 15.
Are buried, and the bolts 21, 21,... Are fitted into these inserts 23, 23,.

The concrete plate 22 is made of a material which can be easily cut by a cutter of a shield excavator, and the precast plate 20 is made of a material having a higher strength than the concrete plate 22. It is manufactured using. These concrete plate 22 and precast plate 20
Work to fabricate the segments S 2 integrally fabricated work and these are the be done outside the factory or the like,
Scene, it is assumed that carries pre-production already segment S 2.

As shown in the figure, holes 24, 24,... Are provided in the end face 20b of the precast plate 20, and pins (not shown) are inserted into these holes 24, 24,. The precast plates 20 can be joined via pins. Accordingly, by assembling the other segment S 2 via a pin (not shown) a segment S 2, the segments S 2, S 2, ... of the inner shell part 18, by integrating ..., first shield It is possible to function as a structure constituting the tunnel lining of the tunnel 15.

On the other hand, the outer shell 19 in the segment S 2 is made of a concrete plate 22,
, And inserts 23, 23,
Are formed of a material that can be easily cut, so that they can be cut by a shield excavator or the like.

The first shield tunnel 15, 15, which is configured as described above, after prior build ..., in turn, these first shield tunnel 15 and 15, the natural ground G b located between ... By excavating with a shield excavator,
The second shield tunnels 16, 16,.

[0036] At this time, in conjunction with the shield excavator with natural ground G b, by drilling a portion of the plain concrete portion 15b of the first shield tunnel 15, the second shield as illustrated in FIG. 1 The end face 16b of the tunnel 16
Unreinforced concrete section 15 of the first shield tunnel 15
The first and second shield tunnels 15 and 16 are overlapped and integrated.

FIG. 5 shows the first shield tunnel 15 and the second shield tunnel 16 when the second shield tunnels 16, 16,.
3 shows details of the structure of the polymerized portion.

As shown in the figure, when the second shield tunnel 16 is excavated and formed, only the plain concrete portion 15b of the first shield tunnel 15 is excavated, and the portion to be excavated is precast. Concrete part 1
Do not reach 5a. In addition, as described above, in the joining operation of the first and second shield tunnels 15 and 16, the dimension of one side of the first shield tunnel 15 is compared with the end face 16 b of the second shield tunnel 16. By forming these first and second shield tunnels 15 and 16 so as to be large,
It can be done without difficulty. However, when excavating the plain concrete portion 15b, the corners 15c, 15c,... Constituting the four corners of the first shield tunnel are located adjacent to the second shield tunnel 16, 16,. FRP is applied to portions other than the cutting portion (the portion cut along with the excavation of the second shield tunnel 16) such as the corners 15c so that no It is desirable to appropriately reinforce with a reinforcing bar or the like.

As described above, the first and second shield tunnels 15, 15, ..., 16, 16, ... are integrated so as to surround the installation position R of the large-section tunnel 10 in the ground G. After the formation of the structure 11 (see FIG. 1), the ground G located inside the tunnel structure 11 is excavated, and the internal space 12 (see FIG. 1) is formed therein. Large section tunnel 1 as shown
0 will be completed.

In the above-described method of constructing the large-section tunnel 10, the segment S used for constructing the first shield tunnels 15, 15,... Is located on the second shield tunnel 16, 16,. as things will be referred to with the segment S 2 having a double structure composed of inner shell part 18 formed in the high strength compared to the outer shell 19 and the outer shell portion 19 can be cut by the shield excavator, further , when constructing a second shielding tunnel 16, 16, ... and as the first shield tunnel 15 and 15, together with the natural ground G b located between ... drilling outer shell 19 of the segment S 2 I have.

[0041] By this arrangement, the outer shell portion 19 of the segment S 2 can be substituted for backfilling of the preceding shield tunnel in constructing a conventional large section tunnel, thereby, conventional unlike In addition, when excavating the preceding shield tunnel, it is not necessary to form a thick backfill portion or the like, and the workability of the preceding shield tunnel can be improved as compared with the related art.

The segment S 2 can be manufactured in advance outside a factory or the like, and a portion of the first shield tunnel 15 excavated with the construction of the second shield tunnel 16. (Segment S 2
The quality of the outer shell portion 19) does not vary.

Therefore, unlike the related art, it is difficult to control the strength of the backfill part of the tunnel constructed in advance, and as a result,
This backfill part may be an obstacle when excavating the shield tunnel to be built later, or the backfill part is insufficient in strength at the joint between the shield tunnel built earlier and the shield tunnel built later. There is no problem with strength. For this reason, the workability and safety of the large-section tunnel can be improved as compared with the related art.

Further, since the segment S 2 is used only on the side of the second shield tunnel 16 in the first shield tunnel 15, the number of segments S 2 to be used is reduced to achieve economy. Is possible,
Further, the lining thickness of the first shield tunnel 15 on the outer side of the large-section tunnel 10 does not become excessively large, and thereby the large-section tunnel 10 is constructed close to the limit of the site boundary or the like. It is possible to

The segment S 2 used in the above-described large-section tunnel 10 has a structure in which an outer shell 19 that can be cut and integrated with an inner shell 18 that can function as a structural material is integrated. As a result, the quality of the outer shell part of the tunnel lining of the first shield tunnel 15 is replaced with the outer shell part 19 instead of the backfill part of the preceding shield tunnel when constructing the conventional large-section tunnel. Can be kept good. Thereby, in constructing the second shield tunnel 16, it is possible to prevent the work of excavating the first shield tunnel 15 from becoming an obstacle. Further, by using such a segment S 2, unlike the conventional, when drilling preceding shield tunnel, thick backfill portion such there is no need to form, it is possible to improve the workability of the prior shielded tunnel .

[0046] Further, formed by a concrete plate 22 made of an outer shell portion 19 of the segment S 2 to be used in large section tunnel 10 above the unreinforced concrete, yet,
The inner shell portion 18 due to the forming by precast plate 20 made of a material of higher strength than the outer shell portion 19, it is possible to manufacture a segment S 2 having the above functions economically and easily.

In the above embodiment, the structure of each part of the large-section tunnel 10, the material of the segment S, the method of constructing the large-section tunnel 10, and the like are described without departing from the scope of the present invention. May be adopted.

For example, in the above embodiment, the large-section tunnel 10 and the first and second shield tunnels 1
Although the cross-sectional shapes of 5 and 16 are rectangular, they may be circular or other cross-sectional shapes instead.

In the above embodiment, the large-section tunnel 10 is composed of the first and second shield tunnels 15,
Although it was formed by combining 16 types of tunnels, the configuration is not limited to this, and a configuration in which three or more types of shield tunnels are alternately arranged adjacent to each other may be used.

[0050] Further, the segments S 1 and S 2 that it was used in the above embodiment, all of the segments S 1, but the inner shell 18 of the segment S 2 was formed by precast concrete, instead Alternatively, these may be made of steel, and other materials may be used as long as they can function as a structure.

[0051] Further, in the above embodiment, the inner shell 18 and outer shell 19 of the segment S 2 bolt 21,2
The connection is made by 1,..., But this connection may be made by adhesion, or the segments S 2 are manufactured by casting concrete having different compositions into layers and integrally molding them. You may do so.

The bolts 21, 21,... And the inserts 23, 2 used in the above-described embodiment are used.
For 3, ..., steel may be used. However, in this case, the bolts 21, 21,... And the inserts 23, 23,... Need to have such a length that they do not enter a region to be cut along with the construction of the second shield tunnel 16.

In addition, any other configuration may be adopted as long as it does not depart from the gist of the present invention, and the above-described modifications may be selectively combined as appropriate. Needless to say, this may be done.

[0054]

As described above, in the method for constructing a large-section tunnel according to the first aspect, of the segments used for constructing the first shield tunnel, those segments located on the second shield tunnel side. As the outer shell portion that can be cut by the shield excavator, and a segment having a double structure including an inner shell portion formed with higher strength than the outer shell portion, and further, a second shield When constructing the tunnel, the outer shell of the segment will be excavated along with the ground located between the first shield tunnels. By doing so, the outer shell of the segment can be used as a substitute for the backfill of the preceding shield tunnel when constructing a conventional large-section tunnel, and, unlike the conventional method, the leading shield tunnel is excavated. In doing so, it is not necessary to form a thick backfill portion or the like, and the workability of the preceding shield tunnel can be improved as compared with the related art. In addition, the segment can be manufactured in advance outside a factory or the like, and a portion of the first shield tunnel that is excavated along with the construction of the second shield tunnel (the outer shell portion of the segment). There is no variation in the quality of the product. Therefore, unlike the conventional method, it is difficult to control the strength of the backfill part of the previously constructed tunnel, and as a result, this backfill part becomes an obstacle when excavating the shield tunnel to be built later, or The strength of the joints between the shield tunnel constructed earlier and the shield tunnel constructed later does not become insufficient due to insufficient strength of the confined part. Safety can be improved.

In the segment according to the second aspect, since the outer shell portion that can be cut by the shield excavator and the inner shell portion that is formed with higher strength than the outer shell portion are integrated, By using the outer shell of the first shield tunnel as a substitute for the backfill of the previous shield tunnel when constructing a conventional large-section tunnel, the quality of the outer shell of the tunnel lining of the first shield tunnel can be kept good. it can. As a result, when constructing the second shield tunnel,
The work of excavating the first shield tunnel can be prevented from becoming an obstacle. Also, by using such a segment, it is not necessary to form a thick backfill portion or the like when excavating the preceding shield tunnel unlike the related art, and the workability of the preceding shield tunnel can be improved.

The segment according to claim 3 can be manufactured economically and easily because the portion of the outer shell other than the cut portion is formed of unreinforced concrete. 2 can be satisfactorily realized.

In the segment according to the fourth aspect, since the inner shell is formed of precast concrete, the composition of concrete is adjusted so that the inner shell can exhibit sufficient strength as a structure. As a result, it is possible to easily and economically manufacture a segment having a necessary function, whereby the invention according to claim 2 or 3 can be favorably realized.

According to the fifth aspect of the present invention, since the inner shell portion is made of steel, the inner shell portion can exhibit sufficient strength as a structure and can be easily manufactured. Thus, the invention according to claim 2 or 3 can be favorably realized.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a large-section tunnel schematically showing an embodiment of the present invention.

FIG. 2 is a view showing a procedure when constructing the large-section tunnel shown in FIG. 1, and is an elevation sectional view showing a situation when a first shield tunnel is constructed in advance in the ground.

FIG. 3 is an enlarged sectional view showing the first shield tunnel shown in FIG. 2 in an enlarged manner.

FIG. 4 is an exploded perspective view showing details of a structure of a segment forming a part of the first shield tunnel shown in FIG. 3;

FIG. 5 is an enlarged sectional view showing an overlapped portion of the first and second shield tunnels when a second shield tunnel is subsequently constructed after a first shield tunnel is constructed in advance.

FIG. 6 is a vertical sectional view showing an example of a conventional large-section tunnel.

7 is a view showing a procedure for constructing the large-section tunnel shown in FIG. 6, and is an elevational sectional view showing a situation when a preceding small-diameter tunnel is constructed in advance in the ground.

[Explanation of symbols]

Reference Signs List 10 Large section tunnel 11 Tunnel structure 12 Inner space 15 First shield tunnel 16 Second shield tunnel S, S 1 , S 2 segment 18 Inner shell 19 Outer shell G Ground mountain R Construction target position of large section tunnel

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroshi Kazama 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Takashi Kuhara 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Shinji Seki Shimizu Corporation, 2-3-2 Shibaura, Minato-ku, Tokyo

Claims (5)

[Claims]
1. A plurality of first shield tunnels are pre-constructed at intervals with a plurality of shield excavators using a plurality of shield excavators so as to surround a construction target position of a tunnel in the ground. By excavating the ground between the shield tunnels with a shield excavator, and constructing the second shield tunnel behind the first shield tunnel in a state where the second shield tunnel overlaps with the first shield tunnel, A tunnel structure in which the first and second shield tunnels are alternately arranged adjacently to surround the construction target position is constructed. Thereafter, the inside of the tunnel structure is excavated, and a space is formed here. By forming, it is configured to construct a tunnel having a large cross section, and when constructing the first shield tunnel,
Among the segments constituting the first shield tunnel, the outer shell portion which can be cut by a shield excavator and the outer shell portion are formed with higher strength as those located on the second shield tunnel side. Using a structure having a double structure consisting of an inner shell portion, further, when the second shield tunnel is constructed by overlapping the first shield tunnel with the first shield tunnel, A method for constructing a large-section tunnel, comprising excavating an outer shell of the segment together with the ground.
2. A first shield tunnel is pre-constructed in the ground, and then a second shield tunnel is superimposed on the first shield tunnel adjacent to the first shield tunnel. By constructing a row, it is used when constructing a large-section tunnel having the first and second shield tunnel, a segment constituting at least a part of the first shield tunnel, It has a double-layered structure in which an outer shell formed so as to be able to be cut by a shield excavator and an inner shell formed with higher strength than the outer shell are laminated. The segment characterized by.
3. The segment according to claim 2, wherein at least a cut portion of the outer shell is formed of unreinforced concrete.
4. The segment according to claim 2, wherein the inner shell is formed of precast concrete.
5. The segment according to claim 2, wherein the inner shell is made of steel.
JP9345559A 1997-12-15 1997-12-15 Construction method of large section tunnel and segment therefor Pending JPH11173098A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9345559A JPH11173098A (en) 1997-12-15 1997-12-15 Construction method of large section tunnel and segment therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9345559A JPH11173098A (en) 1997-12-15 1997-12-15 Construction method of large section tunnel and segment therefor

Publications (1)

Publication Number Publication Date
JPH11173098A true JPH11173098A (en) 1999-06-29

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Family Applications (1)

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Country Status (1)

Country Link
JP (1) JPH11173098A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015105513A (en) * 2013-11-29 2015-06-08 清水建設株式会社 Construction method for outer shell shield tunnel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015105513A (en) * 2013-11-29 2015-06-08 清水建設株式会社 Construction method for outer shell shield tunnel

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