JPH08326488A - Segment ring for tunnel lining - Google Patents

Abstract

PURPOSE: To reduce the clearance between segments and the ground to set them and make it possible to move as a three-hinge structure having respective segments equally divided into three parts. CONSTITUTION: A segment ring 1 is constituted of four-divided parts of a segment 4 to the set afterward, in which the key part 5 and the chief body 6 are rigidly connected to each other, and segments 2, 3, to be set first, and works as a three-hinge structure having three segments 2, 3, 4 equally divided into three parts. The key part 5 is formed in parallel with the tunnel axis so that the connection face 5a with the segment 3 is made as a hinge structure and also the connection face 5b with the chief body 6 is made rigid. The chief body 6 is formed so that the connection face 6a with the key part 5 is made rigid and the connection face 6b with the segment 2 is formed in parallel with the tunnel axis to have a hinge structure. The key part 5 necessary for the setting work, which does not require clearance from the ground, is used as a constituting member of the segment 4. In this way, the segment ring 1 acting as a three-hinge structure can be assembled in the setting work which does not require clearance.

Description

Detailed Description of the Invention

[0001]

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

[0002]

Prior Art and Problems to be Solved by the Invention
As a segment ring for forming a tunnel lining in the shield construction method, a segment ring that is divided into three equal parts with a three-hinge structure is known to form an internally stable shield lining. The shield construction method using the segment ring divided into three equal parts has been widely spread from the past as an economical construction method of a small diameter tunnel.

As a method of assembling the three-divided segment ring in a small-diameter shield machine, as shown in FIG.
Make the clearance between 0, 31, 32 and the ground 35 larger than usual and set the segment 30 first, and then use the clearance to set the segment 31 and the segment 32 from the inside of the ring. What is done by a method is generally known.

However, in the method of assembling such a segment ring divided into three equal parts, for the reason described above,
In order to increase the excavation cross section by the shield machine compared to the outer diameter of the segment ring and increase the clearance between each segment and the ground, the backfill material that fills the clearance becomes larger than the excavation cross section. There is a problem. Therefore, the backfill material is likely to be affected by the quality and construction accuracy, and there is a possibility that the ground surface may be depressed. Further, the ratio of the cost for this backfill material to the total construction cost becomes large.

The present invention was devised in view of the above-mentioned circumstances, and an object thereof is to reduce the clearance between each segment and the ground when setting each segment and reduce the filling amount of the backfill material. It is an object of the present invention to provide a segment ring for tunnel lining which can be reduced in number and can behave as a three-hinge structure by each segment divided into three equal parts.

[0006]

[Means for Solving the Problems] In order to set each segment in a ring shape without using the clearance in order to reduce the clearance between each segment and the natural ground, a setting method using a key segment (K type segment) is used. If adopted, it can be dealt with. However, such a concept of a key segment has not existed in the segment ring of the conventional three-hinge structure because the segment ring must be divided into three even from the viewpoint of structural stability.

Therefore, in the present invention, when the segment ring is assembled by assembling three segments divided into three parts in a ring shape with a three-hinge structure to form a tunnel lining, the segment to be set later is set to the main body part. And the key part to be set at the end. Then, in the key portion, the above-mentioned key segment (K type segment)
Will have the effect of.

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

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

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

From these things, in the segment ring for tunnel lining of the present invention, the key portion necessary for enabling the setting work of each segment without utilizing the clearance between the segment and the natural ground. By using the (key segment) as a constituent member of a segment to be set later, a segment ring in which three segments that are divided into three equal parts have a ring shape with a three-hinge structure is used, and the clearance between the segment and the natural ground is used. It can be assembled without doing.

As described above, according to the present invention, the setting work of each segment can be performed without utilizing the clearance between the segment and the natural ground, so that the clearance between each segment and the natural ground can be reduced. You can
Therefore, even in the small-diameter shield construction method of the three-hinge structure, it is possible to assemble using a shield machine similar to a general shield construction method, and it is possible to construct a shield tunnel with a minimum backfill injection amount.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The tunnel lining segment ring of the present invention will be described below with reference to the illustrated embodiments.

As shown in FIGS. 1A and 1B, a tunnel lining segment ring 1 in which three segments divided into three equal parts are formed into a ring shape with a three-hinge structure is shown in FIGS. 1 (a) and 1 (b). It is composed 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 constituted by rigidly joining and integrating the main body portion and the key portion 5 to be set finally.

The key portion 5 of the segment 4 (see FIG. 2)
(See (c)) is the tunnel axis (not shown) of the tunnel so that the joint surface 5a with the segment 3 at one end has a hinge structure.
And the joint surface 5b at the other end are rigidly joined to the main body 6. In addition, the main body 6 (see FIG. 2 (c)) has the joint surface 6a at one end that is the key portion 5.
It is formed so as to be rigidly joined to the other end, and the joining surface 6b with the segment 2 at the other end is formed parallel to the tunnel axis so as to form 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 part 5 and the main body part 6, and which is set later, and two other segments 2, 3 (see FIG. 3), which are set first. With the divided configuration, three segments 2, 3, which are equally divided
It is configured so that it can behave as a 3-hinge structure by 4.

Incidentally, the segment ring 1 in this embodiment
Has a joint between segments that is a hinge structure at both ends, and is so-called A-shaped segment 2 and 3 pieces and integrated by rigid joining while having the same shape as these segments 2 and 3. A total of 4 including a key portion 5 (so-called K-shaped segment) and a main body portion 6 (so-called B-shaped segment), which are two pieces, and a segment 4 having joints between segments having a hinge structure at both ends. It is divided into four parts. The segment ring 1 is divided into three equal parts by the respective segments 2, 3 and 4, and can behave as a three-hinge structure.

Further, the joint surfaces 5b and 6a for rigidly joining the key portion 5 and the main body portion 6 in the segment 4 in this embodiment.
Is formed so as to be inclined with respect to the tunnel axis (not shown) of the tunnel, as shown in FIG. 1 (b) and FIGS. 2 (b) and (c).

Further, each segment 2 in this embodiment is
3 and 4 have a tenon 7 for the purpose of stopping water on the connection surface around them.
Are formed. A water blocking seal 8 (see FIGS. 5 and 6) is stored in the central portion of the tenon 7, and the tenon 7 is crimped by a jack thrust of a shield machine (not shown).

Incidentally, the segment ring 1 in this embodiment
The ring joint in the shield machine (not shown)
In order to maintain the jack thrust force, the insert 9 is embedded and the joint plate 10 is used for fixing, as shown in FIG. In addition, the inter-segment joint in the segment ring 1 in this embodiment is a joint in which both ends are fitted to the recess 11 provided in the segment as shown in FIG. It has a simple structure with a pulling effect, which is fixed by a plate 13 for use.

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

Next, the segment 4 is set. At this time, first, the segment body 4 is set from the main body portion 6 and then the key portion 5 is set. This key part 5
4 is set by inserting it between the main body portion 6 and the segment 3 in the tunnel axial direction by utilizing the inclined joint surfaces 5b and 6a as shown in FIG. The key portion 5 is also temporarily fixed by the ring joint shown in FIG.

Thereafter, the respective segments 2, 3 and 4 are
The hinge-structured inter-segment joint shown in FIG. 6 ensures reliable joining. At this time, the inclined joint surfaces 5b and 6a between the key portion 5 and the main body portion 6 do not have a hinge structure,
The joint plates 12 (see (c) of FIG. 2) provided on the joint surfaces 5b and 6a are rigidly joined by tightening with bolts (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 inter-segment joints, the segments 2 and 3 are joined together.
Since 3 and 4 are connected by a hinge structure, the entire segment ring 1 can behave as a three-hinge structure divided into three equal parts.

Next, the joint plate 9 of the ring-to-ring joint having a hinge structure is tightened, and the water blocking seal 7 between the segment pieces is crimped. This completes the assembly of the segment ring 1.

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

As described above, according to the tunnel lining segment ring 1 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 type) is formed. Even if the setting work of each segment is performed by using the (segment), the segment ring 1 can behave as a three-hinge structure with three equal segments. Therefore, even in the small-diameter shield construction method of the three-hinge structure, it is possible to assemble using a shield machine similar to a general shield construction method, and it is possible to construct a shield tunnel with a minimum backfill injection amount.

[0028]

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

As described above, according to the present invention, even if the setting work of each segment using the key portion (K type segment) is performed to reduce the clearance between each segment and the natural ground, the segment ring is It can behave as a 3-hinge structure. Therefore, even in the small-diameter shield construction method of the three-hinge structure, it is possible to assemble using a shield machine similar to a general shield construction method, and it is possible to construct a shield tunnel with a minimum backfill injection amount.

[Brief description of drawings]

1A is a schematic view showing a segment ring for tunnel lining of the present invention, and FIG. 1B is a view taken along the line AA of FIG.

FIG. 2 (a) is a segment to be set later at the time of assembling the segment ring of the present invention.
Part (b) is an enlarged detailed view of the part, and (b) is a view taken along the line C-C of (a).
FIG. 6 is a schematic view showing a state in which a segment to be set later is divided into a key portion and a main body portion.

FIG. 3 (a) is a segment which is first set in the segment ring of the present invention when it is assembled, and FIG. 3 (b) is an enlarged detail view of a D portion of FIG. Is.

FIG. 4 is a schematic view showing a set state of a key portion that constitutes a segment to be set later, when the segment ring of the present invention is assembled.

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 view showing another aspect of a set state of a key portion that constitutes 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 ... Joining surface, 6 ... Main body portion, 6a, 6b ... Joining surface, 7 ... Tenon, 8 ... Water seal, 9 ... Insert, 10 ... Joint plate, 11 ... Recessed portion, 12 ... Joint plate, 13 ... Plate for fittings.

Claims (1)

[Claims] 1. A segment ring for forming a tunnel lining by assembling three equally divided three segments in a ring shape with a three-hinge structure, wherein the segment ring is first set during assembly. It consists of one segment and one segment to be set later, and the segment to be set later is composed by rigidly joining the main body part and the key part to be set at the end. The key portion is formed in parallel with the tunnel axis of the tunnel so that a joint surface of one end of the key portion with the previously set segment has a hinge structure, and the other joint surface of the key portion is rigid with the main body portion. The main body portion is formed so that the joint surface at one end can be rigidly joined to the key portion, and is set at the tip of the other end. 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, which is set later, and the other two are set at the tip. A segment ring for tunnel lining, characterized in that it can behave as a three-hinge structure with three segments divided into three equal parts.