JP3234128B2 - Segment ring for tunnel lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-hinge segment ring used for forming a lining of a small-diameter tunnel by a shield method, in particular.

[0002]

2. Prior Art and Problems to be Solved by the Invention
As a segment ring forming a tunnel lining in the shield method, a three-part segment ring integrated with a three hinge structure is known to form an internally stable shield lining. The shield method using the three-divided segment rings has been widely used as an economical method for constructing a small-diameter tunnel.

[0003] As a method of assembling the three-divided segment rings in a small-diameter shield machine, as shown in FIG.
The clearance between 0, 31, 32 and the ground 35 is made larger than usual. First, the segment 30 is set, and then the segments 31 and 32 are set from the inside of the ring by using the clearance. What is done in a method is generally known.

However, in such a method of assembling the segment ring divided into three equal parts, for the reason described above,
To increase the clearance between each segment and the ground by enlarging the excavated cross section by the shield machine compared to the outer diameter of the segment ring, the backfill material to fill the clearance becomes larger than the excavated cross section There is a problem. For this reason, the quality of the backfill material and the construction accuracy are liable to be affected, and the ground surface may be depressed. Moreover, the ratio of the backfill material cost to the total construction cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has an object to reduce the clearance between each segment and the ground when setting each segment, thereby reducing the filling amount of the backfill material. It is an object of the present invention to provide a tunnel lining segment ring that can be reduced and that can behave as a three-hinge structure formed by three equally divided segments.

[0006]

In order to reduce the clearance between each segment and the ground, to set each segment in a ring shape without using the clearance, a setting method using a key segment (K-shaped segment) is required. If you adopt it, you can deal with it. However, such a concept of a key segment is not present in a segment ring having a conventional three-hinge structure because the segment ring must be divided into three even in view of structural stability.

Therefore, according to the present invention, when assembling a segment ring for forming a tunnel lining by assembling three equally divided three segments in a three-hinge structure, a segment to be set later is replaced with a main body part. And a key part to be set last. The key segment (K-type segment)
Will have the effect of

More specifically, when assembling, the segment ring is composed of a segment to be set first and a segment to be set later. The segment to be set later is composed of a main body and a key to be set last. It is configured by rigidly joining the parts and integrating them.

The key portion of the segment to be set thereafter is formed in parallel with the tunnel axis of the tunnel so that the joint surface with the segment to be set at one end has a hinge structure, and the key portion of the other end is set. The joint surface is formed so that it can be rigidly joined to the main body. The main body is formed so that the joint surface at one end can be rigidly joined to the key portion, and is formed parallel to the tunnel axis so that the joint surface with the segment set at the other end has a hinge structure. Have been.

As described above, the segment ring for tunnel lining according to the present invention is divided into four parts: a segment to be set after being divided into two from the key part and the main body, and a segment to be set to the other two parts. The configuration is such that it can behave as a three hinge structure with three equally divided segments.

From these facts, in the segment ring for tunnel lining according to the present invention, the key portion necessary for performing the setting work of each segment without using the clearance between the segment and the ground is used. By using the (key segment) as a component of a segment to be set later, a three-segmented three-segment ring-shaped segment ring uses the clearance between the segment and the ground. Can be assembled without the need.

As described above, according to the present invention, each segment can be set without using the clearance between the segment and the ground. Therefore, the clearance between each segment and the ground can be reduced. Can be.
Therefore, even in a small-diameter shield method having a three-hinge structure, it is possible to assemble using a shield machine similar to a general shield method, and a shield tunnel can be constructed with a minimum backfill injection amount.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a segment ring for tunnel lining according to the present invention.

As shown in FIGS. 1 (a) and 1 (b), a tunnel lining segment ring 1 in which three equally divided segments are formed into a ring shape with a three-hinge structure is used first in assembling. It consists of two segments 2 and 3 to be set and one segment 4 to be set later.
Further, the segment 4 to be set thereafter is formed by rigidly joining the main body portion 6 and the key portion 5 to be set last and integrating them.

The key portion 5 of the segment 4 (FIG. 2)
(c) refer to the tunnel shaft (not shown) of the tunnel so that the joining surface 5a with one end of the segment 3 has a hinge structure.
And the other end is formed such that the joining surface 5b at the other end can be rigidly joined to the main body 6. The main body 6 (see FIG. 2 (c)) has a joining surface 6a at one end.
And is formed in parallel with the tunnel axis so that the joining surface 6b with the segment 2 at the other end has a hinge structure.

Thus, the segment ring 1 of the present invention
Is composed of a segment 4 (see FIG. 2), which is divided into two parts from the key portion 5 and the main body portion 6 (see FIG. 2), and two other segments 2, 3 (see FIG. 3) which are set first. In the split configuration, three segments 2, 3,
It is configured so that it can behave as a three-hinge structure according to 4.

The segment ring 1 in this embodiment
Has an inter-segment joint having a hinge structure at both ends, and is integrated with two pieces of so-called A-type segments 2 and 3 by rigid joining while having the same shape as the segments 2 and 3. And a segment 4 composed of two pieces, a key portion 5 (so-called K-type segment) and a main body portion 6 (so-called B-type segment), and having a hinge structure inter-segment joint at both ends. It has a four-piece configuration with pieces. The segment ring 1 is divided into three equal parts by the segments 2, 3, and 4, and can behave as a three hinge structure.

Also, the joining surfaces 5b and 6a of the segment 4 in this embodiment where the key portion 5 and the main body portion 6 are rigidly joined.
As shown in FIG. 1 (b) and FIGS. 2 (b) and 2 (c), it is formed to be inclined with respect to the tunnel axis (not shown) of the tunnel.

Further, each segment 2 in this embodiment
A tenon is provided at 3 and 4 for the purpose of stopping water at its peripheral connection surface.
Are formed. A water seal 8 (see FIGS. 5 and 6) is stored in the center of the tenon 7, and is pressed by a jacking force of a shield machine (not shown).

The segment ring 1 in this embodiment
The ring-to-ring joint in is a shield machine (not shown)
In order to maintain the jack thrust, as shown in FIG. 5, a simple structure in which the insert 9 is embedded and fixed by the joint plate 10 is adopted. Further, as shown in FIG. 6, the inter-segment joint of the segment ring 1 in this embodiment has a joint in which both ends are fitted into a concave portion 11 provided in the segment as shown in FIG. It has a simple structure with a pulling effect, which is fixed by the use plate 13.

The assembling process for lining the segment ring 1 having such a configuration will be described. First, two pieces of the segments 2 and 3 are set, and each of the segments 2 and 3 is connected to the ring shown in FIG. Temporarily fix with a joint.

Next, the segment 4 is set. At this time, first, the segment 4 is set from the main body 6 of the segment 4 and then the key portion 5 is set. This key part 5
As shown in FIG. 4, the set is performed by inserting from the tunnel axial direction using the inclined joint surfaces 5b and 6a, as shown in FIG. The key portion 5 is also temporarily fixed by the inter-ring joint shown in FIG.

Thereafter, each of the segments 2, 3, 4 is
The joining is surely performed by the hinge-to-segment joint shown in FIG. At this time, each of the inclined joining surfaces 5b and 6a of the key portion 5 and the main body portion 6 has a hinge structure, for example,
Rigid joining is performed by tightening a joint plate 12 (see FIG. 2 (c)) provided on each joining surface 5b, 6a with a bolt (not shown). From this, the key portion 5 and the main body portion 6 are integrated to form the segment 4 as shown in FIG.

When the segments 2, 3 and 4 are securely joined by the joints between the segments,
The segments 3 and 4 are connected by a hinge structure, and the entire segment ring 1 can behave as a three-hinged structure divided into three equal parts.

Next, the joint plate 9 of the hinge-to-ring joint having a hinge structure is tightened, and the waterproof seal 7 between the segment pieces is pressed. Thus, the assembly of the segment ring 1 is completed.

In the above-described embodiment, the key portion 5 is set by inserting the key portion 5 between the main body portion 6 and the segment 3 from the direction of the tunnel axis. The joining surfaces 5b and 6a between the main body 6 and the main body 6 are formed in parallel with the tunnel axis (not shown) of the tunnel, and set between the main body 6 and the segment 3 from the inside of the ring 1 as shown in FIG. A method is also conceivable.

As described above, according to the segment ring 1 for tunnel lining of the present invention, in order to reduce the clearance between each of the segments 2, 3, 4 and the ground (see FIG. 8), the key portion 5 (K-shaped) is used. The segment ring 1 can behave as a three-hinge structure with three equal segments even when the segment is set using segments. Therefore, even in a small-diameter shield method having a three-hinge structure, it is possible to assemble using a shield machine similar to a general shield method, and a shield tunnel can be constructed with a minimum backfill injection amount.

[0028]

According to the segment ring for tunnel lining according to the present invention, in which three segments divided into three equal parts are formed in a ring shape with a three hinge structure, the segments 4 to be set later at the time of assembly are integrally joined by rigid joining. It is composed of a key part and a main body part. Therefore, the work of setting each segment using the key portion (K-shaped segment) without using the clearance can be reliably performed even if the three equally divided three segments are formed into a ring shape with a three hinge structure. .

As described above, according to the present invention, even if the segment ring is set using the key portion (K-shaped segment) to reduce the clearance between each segment and the ground, the segment ring can be formed. It can behave as a three hinge structure. Therefore, even in a small-diameter shield method having a three-hinge structure, it is possible to assemble using a shield machine similar to a general shield method, and a shield tunnel can be constructed with a minimum backfill injection amount.

[Brief description of the drawings]

1 (a) is a schematic view showing a segment ring for tunnel lining according to the present invention, and FIG. 1 (b) is a view taken along line AA of FIG. 1 (a).

FIG. 2 (a) is a segment to be set later when assembling the segment ring of the present invention, and FIG.
(B) is a view taken along line CC of (a), and (c)
FIG. 3 is a schematic diagram showing a state where a segment to be set later is divided into a key portion and a main body portion.

FIG. 3 (a) is a detailed view of a portion set in advance in assembling the segment ring of the present invention when assembling, and FIG. 3 (b) is an enlarged detailed view of a portion D in FIG. 1; It is.

FIG. 4 is a schematic diagram showing a set state of a key portion constituting a segment to be set later when assembling the segment ring of the present invention.

FIG. 5 is a schematic view showing an inter-ring joint in the segment ring of the present invention.

FIG. 6 is a schematic view showing an inter-segment joint of the segment ring of the present invention.

FIG. 7 is a schematic diagram showing another setting state of a key portion constituting a segment to be set later in the segment ring of the present invention.

FIG. 8 is a schematic view showing a method of assembling a three-piece segment ring.

[Explanation of symbols]

1 ... Segment ring, 2,3 ... Segment to be set first, 4 ... Segment to be set later, 5 ... Key part,
5a, 5b ... joint surface, 6 ... body part, 6a, 6b ... joint surface, 7 ... tenon, 8 ... water seal, 9 ... insert, 10 ... joint plate, 11 ... recess, 12 ... joint plate, 13 ... Plate for fitting.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-37239 (JP, A) JP-A-49-28141 (JP, A) JP-A-61-45100 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) E21D 11/04 E21D 11/40

Claims (1)

(57) [Claims] 1. A segment ring for assembling three equally divided three segments into a ring shape with a three hinge structure to form a tunnel lining, wherein the segment ring is set first during assembly. Segment and one segment to be set later, and the segment to be set later is configured by rigidly joining the main body and the key to be set last and integrating them. The key portion is formed in parallel with the tunnel axis of the tunnel such that a joining surface of the one end with the segment to be set is a hinge structure, and a joining surface of the other end is rigidly connected with the main body portion. The main body portion is formed so that a joining surface at one end can be rigidly joined to the key portion, and is set at the other end at the tip. The joint surface with the segment is formed in parallel with the tunnel axis so as to form a hinge structure, and is divided into two from the key portion and the main body portion, a segment to be set later, and a set at the other two ends. A segment ring for tunnel lining, characterized in that the segment ring has a four-segment configuration and can behave as a three-hinge structure with three equally divided segments.