JP2662638B2 - Composite section shield tunnel structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compound tunnel tunnel structure at a subway station or the like.

[0002]

2. Description of the Related Art Conventionally, as a construction technique of a subway station section using a shield tunnel having a complex cross section, the technique described in the following publication is known.

[0003] A temporary column is assembled in an axial direction (vertical direction) between upper and lower segments of an overlap portion of a composite sectional shield tunnel,
Furthermore, receiving beams (SR
After the C beam is attached, a steel pipe is wound around the temporary pillar between the upper and lower receiving beams so as to cover the temporary pillar, and concrete is poured into the steel pipe to form the main pillar. Thereafter, the remaining temporary pillars, which are not the main pillars, are cut and removed from the surface portions of the upper and lower receiving beams.

[0004] A box-shaped block-like column-joining segment is used at the upper and lower column joints of the overlap portion of the composite cross-section shield tunnel, and the segment includes a plurality of segments in the tunnel axial direction. A sheath that communicates in series as a set of rings is embedded in advance. Then, the main pillar is assembled between the upper and lower strut joining segments located at the front and rear ends of the set of segment rings, and the temporary pillar is assembled between the upper and lower strut joining segments located in the middle, and PC is attached to each sheath. After inserting a steel material and introducing a prestress into each set of segment rings to integrate them, the temporary column is removed.

[0005]

However, in the conventional example described above, after the primary lining is completed, the segments are connected to each other and subjected to a stress in the tunnel axial direction by constructing the SRC beam or introducing a prestress using a PC steel material. It was necessary to construct a replacement member (beam or girder), and the work had a great effect on the entire construction process.

[0006] After the completion of the construction, the main pillars are present at each overlapping portion, that is, in the case of, for example, a triple cross-sectional structure, two rows of main pillars are installed inside the tunnel, and furthermore, each of them is provided. There is a problem that the hollow section inside the tunnel cannot be effectively used because the convex portion in which the replacement member is embedded or installed is formed above and below.

[0007] An object of the present invention is to form a beam member in the tunnel axial direction by connecting the segments to each other, so that there is no need to construct a replacement member which receives a stress in the tunnel axial direction after the primary lining is completed. An object of the present invention is to reduce the number of rows of the main columns and the number of protrusions above and below the columns so that the hollow section inside the tunnel can be effectively used.

[0008]

According to the present invention, there is provided a shield tunnel structure having a composite cross section, wherein a hollow portion is formed between a horizontal portion inside the tunnel and an arc portion on the ground side to form a D-shaped cross section. In the intermediate segment, the intermediate cross-section and the overlap portion of the composite cross-section shield tunnel are formed, and the upper and lower intermediate segments arranged in the tunnel axis direction are joined together up and down to form a beam member in the tunnel axis direction,
Main pillars are installed between the horizontal portions of the upper and lower intermediate segments at appropriate positions, provided with a connecting portion connecting the horizontal portion and the arc-shaped portion in the hollow portion of the intermediate segment, and lined up in the tunnel axis direction The intermediate segments are joined on both inner and outer sides of the hollow portion.

[0009]

In such a composite shield tunnel structure, the intermediate segment of the D-shaped section constitutes the intermediate section and the overlap of the composite section, and the main pillar is installed at the center of the intermediate section. Become. Therefore, as compared with the case where the main pillars are provided for each of the overlapping portions on both sides of the intermediate cross section, the number of columns is reduced, and the number of protrusions due to the replacement member etc. is also reduced, so that the inner space of the tunnel is reduced. The effective use area increases.

In addition, the horizontal portion and the arc-shaped portion of the intermediate segment are reinforced by a connecting portion in the hollow portion, and the main segment and the temporary column are received in the horizontal portion, and at the same time, the intermediate segments arranged in the tunnel axis direction are separated from each other. Since the inside and outside of the hollow portion are joined on both sides, the intermediate segment also serves as a conventional replacement member, and when completed, a highly rigid tunnel axial beam integrated with the adjacent segment It becomes a member and a segment member in the cross section direction.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of a composite sectional shield tunnel structure according to the present invention. This composite shield tunnel is composed of left and right circular shield tunnel sections 1 and 2 and an intermediate shield tunnel section 3 having a circular shape with an outer shell overlapping with them in the middle. In the case of a subway station, The left and right circular shield tunnels 1 and 2 are subway tunnels for tracks, and the intermediate shield tunnel 3 is a platform. Or circular shield tunnel part 1
Is a track, and the circular shield tunnel 2 and the intermediate shield segment 3 are platforms.

In such a tunnel structure, as shown in FIG. 7, for example, as shown in FIG. 7, large circular tunnels 1a and 2a on both the left and right sides are excavated by a shield machine, and small circular tunnels 3a and 3b on the upper and lower sides are formed in the middle. It is completed by excavating continuously and constructing a primary lining with segments and a secondary lining with concrete in the order of FIGS. In the present invention, since the emphasis is placed on the intermediate segment used in the intermediate shield tunnel section 3,
Before describing the method of construction, the structure of the intermediate segment will be described in detail.

As shown in FIGS. 2 to 6, there are two types of intermediate segments used in the present embodiment, an intermediate segment 4a for main pillars and an intermediate segment 4b for temporary pillars. However, there are some differences.

That is, both intermediate segments 4a and 4b
Has a D-shaped cross section in which a hollow portion 7 is formed between a horizontal portion 5 on the inner side of the tunnel and an arc-shaped portion 6 on the ground side, and has a long and short side from both left and right ends where the horizontal portion 5 and the arc-shaped portion 6 intersect. Connection wing 8
9 is provided so as to be integrally extended, and a vertical plate-shaped connecting portion 10 connecting the horizontal portion 5 and the arc-shaped portion 6 is provided at the center in the left-right direction in the hollow portion 7. 10 and left and right, and a joint 1
1 in that the upper and lower front and rear side plates 12 and 13 are provided.

The only difference is that the upper and lower reinforcing ribs 14.15 are merely provided at the intermediate portion of the temporary column intermediate segment 4b in the front-rear direction. In the middle part in the front-rear direction, a partition wall 17 having both left and right working holes 16 is also provided.

Next, the intermediate segment 4 having such a special structure
An example of the construction method of the present invention, which is constructed using a.4b and a conventional general arc segment, will be described.

As shown in FIG. 7, the tunnels 1a, 2a,
While excavating 3a and 3b with the shield machine, the conventional circular arc segments 18 and 19 are used for the left and right tunnels 1a and 2a in the same manner as before, and the upper and lower tunnels 3a and 3b are used.
For b, the intermediate segment 4a for the main pillar and the intermediate segment 4b for the temporary column are separately used and assembled. That is, as shown in FIG. 8, a combination of the upper and lower temporary column intermediate segments 4 b, the temporary column 20, and a required number of right and left arc segments 18 and 19, respectively (hereinafter, a portion in this form is temporarily A combination of upper and lower main pillar intermediate segments 4a, which are turned upside down as shown in FIG. 9, main pillars 21 and a required number of arc segments 18 and 19, respectively, as shown in FIG. The primary lining is to be carried out using

In this example, as shown in FIG. 12, the ratio of the number of the temporary pillars to the number of the temporary pillars is three, that is, the number of the temporary pillars is three and then the number of the temporary pillars is one. This is repeated in the tunnel axis direction.

In the temporary column assembly, the temporary column 20 is located between the central portions of the horizontal portions 5 of the temporary column intermediate segment 4b installed on the lower side and the temporary column intermediate segment 4b installed on the upper side.
And fix it with bolts and nuts. Then, from the temporary column intermediate segment 4b installed on the lower side to the arc segment 18.1
9 is assembled toward the upper temporary column intermediate segment 4b, and a set of segment rings having a three-section structure reinforced at the center by the temporary column 20 is constructed.

In the main column assembling portion, the main column 21 is located between the central portions of the horizontal portions 5 of the main column intermediate segment 4a installed on the lower side and the main column intermediate segment 4a installed on the upper side.
And fix it with bolts and nuts. Then, from the middle segment 4a for the main pillar installed on the lower side, the arc segment 18.1
9 is assembled toward the upper main pillar intermediate segment 4a, and a set of segment rings having a three-section structure reinforced at the center by the main pillar 21 is constructed.

Also, the temporary column intermediate segments 4b at the temporary assembling locations that are continuous in the tunnel axial direction are similarly joined to each other on both the inner and outer sides of the hollow portion 7 by so-called high-strength bolt friction welding. Temporary column intermediate segment 4b and main column intermediate segment 4
a is joined in the same manner. 2 to 6 show examples of the joining. FIG. 5 shows a bottom view taken along line AA and a bottom view taken along line BB in FIG. 4 respectively.

In the example shown in the figure, the upper and lower front and rear side plates 12 and the lower and front and rear side plates 13 of the intermediate segments 4b are connected to each other and the intermediate segments 4a and 4b are connected to each other in the upper and lower portions in the hollow portion 7 respectively. While joining with a bolt and a nut, the joining portion 11 of the upper front and rear side plates 12 is joined with a bolt and a nut by passing a joining plate 22, and the joining portions 10 are joined with a joining plate 23 on both left and right surfaces thereof. With nuts and bolts. Further, outside the hollow portion 7, the joining plates 24 or 25 are attached to the outer surfaces of the horizontal portions 5.
And joined with bolts and nuts. The joining of the arc segments 18 and 19 in the tunnel axial direction is the same as that of the conventional art. The segment joining in the tunnel axial direction may be performed by a mechanical joint such as a fitting joint.

After reaching the final excavation position by repeating the shield construction while performing the primary lining and the reinforcement as described above, as shown in FIG. Concrete 26 is poured from the working hole 16 of the partition 17 of the intermediate segment 4a, and concrete 27 is also formed around the horizontal portion 5 of the upper intermediate segments 4a and 4b and around the horizontal portion 5 of the lower intermediate segments 4a and 4b. Is installed. In addition, the casting of the concrete 26 into the hollow portion 7 may be omitted.

Thereafter, the upper and lower ends of the temporary column 20 are cut off, and the temporary column 20 other than the main column 21 is removed as shown in FIG. 13, and the right and left circular portions are formed by the arc segments 18 and 19 as shown in FIG. Secondary lining is performed by placing concrete 28 on the inner surface. After this, the subway station is completed by constructing a platform and the like.

In the completed subway station, the intermediate shield tunnel 3 overlaps the left and right circular cross-section shield tunnels 1 and 2 on both left and right sides, but the main pillar 21 is not overlapped. An intermediate segment 4a which is not in each of the parts but in the middle thereof and which constitutes the intermediate shield tunnel 3
・ Because 4b itself is a beam member in the axial direction of the tunnel, there is no longer a convex portion as in the prior art, and effective utilization of the hollow section inside the tunnel can be achieved.

The intermediate segments 4a and 4b are
Since the concrete 26 is filled in the hollow portion 7 communicating with each other in addition to being joined in the tunnel axial direction on both the inner and outer sides of the hollow portion 7, the intermediate segments 4a and 4b are firmly integrated with each other in the upper and lower portions. When viewed from the whole of the composite section shield tunnel, the intermediate shield tunnel section 3 itself has a solid and extremely rigid structure that also functions as a tunnel axial beam member and a cross section segment member.

Next, FIGS. 14 to 17 show another example of the composite cross-section shield tunnel structure of the present invention, in which a box girder serving as a beam member in the tunnel axial direction is incorporated in the intermediate segment, and the rigidity of the intermediate segment is increased. Is higher than the above case. That is, the middle segment 4c shared by the main pillar and the temporary pillar is composed of a left and right vertical connecting portion 10a connecting the horizontal portion 5 and the arc-shaped portion 6 at two right and left positions within the hollow portion 7, and an upper end of the connecting portion 10a. A horizontal connecting portion 10b connecting the left and right portions of the circular arc portion 6 and a connecting portion 10c also serving as a member of the horizontal portion 5 are provided. These connecting portions 10a, 10b, and 10c are box-shaped. Is provided.

In order to join each other in the axial direction of the tunnel using the intermediate segment 4c, the upper front and rear side plates 12 and the lower front and rear side plates 13 are connected to each other with bolts and nuts, and the hollow portion 7 is formed. The left and right joints 10a are joined to each other using a joining plate 23a.
0b are joined together using a joining plate 23b.
The connecting portions 10c are joined to each other on the outer side of the joint plate 24 or 25.
Join using. FIG. 17 is a diagram showing C in FIG.
A bottom view as seen from the -C line and a bottom view as seen from the D-D line are shown half by half.

Next, FIGS. 18 to 22 show another example of the construction method. In this example, normal arc segments 18 and 19 are used for the left and right tunnels 1a and 2a while excavating triple tunnels 1a, 3d and 2a where circles of the same size overlap. Middle tunnel 3d
For the intermediate segment 4a shown in FIGS.
Assemble the segments as before using the intermediate segment 4d larger than 4b. However, in this case, since the intermediate tunnel section is large, FIGS.
As shown in FIG. 1, temporary columns 20 are installed on the left and right sides of the upper and lower intermediate segments 4d, and the main column 21 is installed at the center as shown in FIG. Then, as shown in FIG. 22, the left and right temporary pillars 20 other than the main pillar 21 are removed. The following steps are the same as described above.

[0030]

According to the composite section shield tunnel structure of the present invention, the intermediate segment of the D-shaped section constitutes the intermediate section and the overlap section of the composite section, and the main pillar is installed at the center of the intermediate section. The number of columns and the number of protrusions inside the tunnel are reduced as compared to the conventional case where the main pillars are installed for each of the overlapping portions on both sides of the intermediate cross section, so that the number of protrusions inside the tunnel is reduced. The effective use area of the vacant space becomes wider than before.

In addition, the horizontal portion and the arc-shaped portion of the intermediate segment are reinforced by the joining portion in the hollow portion, and the main portion and the temporary column are received in the horizontal portion, and at the same time, the intermediate segments arranged in the tunnel axis direction are separated from each other. Since the inside and outside of the hollow portion are joined on both sides, the intermediate segment also serves as a conventional replacement member, and the horizontal portion and the arc-shaped portion of the intermediate segment are integrated with the adjacent segment when completed. Since the beam member is a highly rigid beam member in the axial direction and a segment member in the cross section direction, a composite cross section tunnel structure having high rigidity as a whole can be obtained.

Further, since there is no need to construct a replacement member (beam or girder) after the primary lining, the construction period can be shortened.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of a composite cross-section shield tunnel structure according to the present invention.

FIG. 2 is a front view of the main pillar intermediate segment in the same.

FIG. 3 is a front view of a temporary column intermediate segment.

FIG. 4 is a cross-sectional view showing a joining form of intermediate segments in a tunnel axial direction.

FIG. 5 is a bottom view showing the bottom surface viewed along line AA and the bottom surface viewed along line BB in FIG. 4 in half each;

FIG. 6 is a perspective view showing a joining form of the intermediate segments in a tunnel axial direction.

7 to 13 are views for explaining a construction method of the tunnel structure shown in FIG. 1, and FIG. 7 is a conceptual diagram of tunnel excavation by a shield machine.

FIG. 8 is a diagram showing a segment assembling mode of a temporary column assembling position.

FIG. 9 is a diagram showing a manner of assembling a segment at a pillar assembling position.

FIG. 10 is a diagram showing a state when the concrete has been poured into the hollow portion and around the horizontal portion of the intermediate segment.

FIG. 11 is a diagram showing a state when secondary lining is completed.

FIG. 12 is a side view showing an installed state of a main pillar and a temporary pillar.

FIG. 13 is a side view showing a state where a temporary column is removed while leaving a main column.

FIGS. 14 to 17 show another example of the composite sectional shield tunnel structure of the present invention, and FIG. 14 is a front view of an intermediate segment at the position where the pillar is assembled.

FIG. 15 is a front view of an intermediate segment at a temporary pillar assembly position.

FIG. 16 is a perspective view showing a mode of joining the intermediate segments in the tunnel axial direction.

17 is a bottom view and DD taken along line CC in FIG.
It is a bottom view which shows the bottom seen by the line by half.

18 to 22 show another example of the construction method, and FIG. 18 is a conceptual diagram of tunnel excavation by a shield machine.

FIG. 19 is a view showing a segment assembling mode of a temporary column assembling position.

FIG. 20 is a diagram illustrating a segment assembling mode of a main pillar assembling position.

FIG. 21 is a side view showing an installation state of a temporary column.

FIG. 22 is a side view showing a state where a temporary column is removed while leaving a main column.

[Explanation of symbols]

 4a ・ 4b Intermediate segment 4c ・ 4d Intermediate segment 5 Horizontal part 6 Arc-shaped part 7 Hollow part 8.9 Connecting wing part 10.10a ・ 10b ・ 10c Joint part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsushi Sonoda 2-58-8 Kitaaoyama, Minato-ku, Tokyo Co., Ltd. Intra-company group (72) Inventor Shigeki Sataka 2-58-8 Kitaaoyama, Minato-ku, Tokyo Co., Ltd. (72) Inventor Hiroshi Kouraba 2-5-8 Kitaaoyama, Minato-ku, Tokyo Co., Ltd. (72) Inventor Koji Kawaji 2-5-8 Kitaaoyama, Minato-ku, Tokyo Co., Ltd. (56) References JP-A-2-104898 (JP, A) JP-A-3-122399 (JP, A)

Claims (1)

(57) [Claims] 1. An upper and lower intermediate segment having a D-shaped cross-section by forming a hollow portion between a horizontal portion on the inner side of the tunnel and an arc-shaped portion on the ground side. The upper and lower intermediate segments arranged in the tunnel axis direction are joined together to form a beam member in the tunnel axis direction, and the main pillar is installed between the horizontal portions of the upper and lower intermediate segments at appropriate positions. In a composite cross-section shield tunnel structure, a connecting portion that connects the horizontal portion and the arc-shaped portion is provided in the hollow portion of the intermediate segment, and the intermediate segments arranged in the tunnel axis direction are joined on both the inner and outer sides of the hollow portion The composite section shield tunnel structure is characterized by the following.