JPH11270292A - Shield tunnel and segment used therefor and shield tunneling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield tunnel, in which the adhesive strength of a segment and backfilling fillers is improved and the construction cost of the tunnel can be reduced, and the segment used for the shield tunnel and a shield tunneling method. SOLUTION: In the shield tunnel 1, irregularities 6 are formed to the outer circumferential surface of a lining-body main body 3 composed of each segment S1 by installing flat bars 7 on the external surfaces 5 of these segments S1, and adhesive strength with backfilling fillers 4 filled on the outer circumferential side of the lining-body main body 3 is increased. The flat bars 7 are mounted beforehand before the assembly of the segments S1 for constructing such a shield tunnel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tunnel suitable for constructing various shield tunnels, a segment used for the tunnel, and a shield method.

[0002]

2. Description of the Related Art As is well known, a shield construction method is often used to construct a tunnel by forming an excavation hole in the ground with a shield excavator and assembling a steel or concrete segment behind the tunnel. Have been.

At this time, the inner diameter of the drilling hole is substantially the same as the outer diameter of the shield excavator, that is, the outer diameter of the skin plate forming the outer shell of the shield excavator. In addition, since the segments are assembled in the skin plate of the shield excavator, the outer diameter of the assembled segment is smaller than the inner diameter of the skin plate. For this reason, the gap between the inner peripheral surface of the borehole and the outer peripheral surface of the assembled segment is usually, for example, 10 mm.
There is a gap of about cm. It is well known that backfill filler is used to prevent this, because if the earth and sand above the tunnel enters this gap, the ground surface will sink and the stability of the ground will be impaired. It is on the street.

[0004]

However, the above-mentioned conventional techniques have the following problems.
Conventionally, when a tunnel is generally constructed by using a shield method, no consideration has been given to the bonding strength between the backfill material and the segments. For this reason, the structural strength of the layer made of the backing filler cannot be expected, and the load such as earth pressure and water pressure applied to the tunnel is all designed to be handled by the segments. As a result, it is necessary to increase the strength of the segment, the thickness of the segment increases, and the cost of the segment, which accounts for a large proportion of the tunnel construction cost, increases, and the overall cost also increases. Had an effect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a shield tunnel capable of increasing the bonding strength between a segment and a backfill material and reducing the tunnel construction cost, and a segment used therefor. Another object is to provide a shield method.

[0006]

The invention according to claim 1 is
A lining body is formed by assembling a plurality of segments in a digging hole formed in the ground, and a backfill filling is provided between an outer peripheral surface of the lining body and an inner peripheral surface of the digging hole. One or both of the convex portion and the concave portion are formed on the outer peripheral surface of the lining body main body in order to increase the adhesive strength with the backing filler material. It is characterized by.

[0007] By forming one or both of the convex portion and the concave portion on the outer peripheral surface of the lining body in this manner, the adhesion strength between the lining body and the backfill material is increased,
The lining body and the backing filler are integrated.

According to a second aspect of the present invention, there is provided a segment used as a lining body of a tunnel, wherein the segment has a surface on an outer peripheral side of the tunnel when the segment is assembled, In order to increase the bonding strength with the back filling material to be cast, one or both of the convex portion and the concave portion are formed.

Thus, if such a segment is used when constructing a tunnel, the adhesion strength between the assembled segment and the backfill material cast on the outer peripheral side thereof is increased, and the integration thereof is good. It is planned.

According to a third aspect of the present invention, in the segment according to the second aspect, the convex portion and the concave portion are formed by attaching a steel member to a surface on the outer peripheral side of the tunnel. It is characterized by being.

According to a fourth aspect of the present invention, in the segment according to the second aspect, at least one surface or both of the convex portion and the concave portion is formed on the surface of the segment on the outer peripheral side of the tunnel. It is characterized by being composed of a plate-shaped material.

The invention according to claim 5 is the invention according to claims 2 to 4
In the segment according to any of the above, a pin is fixed to the surface of the outer circumferential side of the tunnel, the base end of which is integrally fixed to the segment, and the distal end of the pin is fixed to the outer circumferential side of the tunnel. The projection is formed by projecting toward the.

By providing the pins in this manner,
A convex portion is formed on the segment.

According to a sixth aspect of the present invention, in the segment according to the fifth aspect, a bolt is used as the pin,
The bolt is characterized in that a base end thereof is fixed to a nut attached to an inner peripheral surface side of the segment, and is provided so as to protrude from a hole formed in the segment to the outer peripheral side.

According to a seventh aspect of the present invention, in the segment according to the fifth aspect, a locking portion projecting in a radial direction of the pin is formed at a base end portion of the pin, and the pin is attached to the segment. The pin is provided so as to protrude from the formed hole toward the outer peripheral side thereof, and the base portion of the pin is fixed by locking the locking portion to the hole.

The invention according to claim 8 is a shield construction method for constructing a tunnel, wherein a segment forming a lining body of the tunnel is provided with an outer periphery of the tunnel when the segment is assembled. One or both of the convex portion and the concave portion are formed on the side surface, and the segments are assembled in the excavation hole formed in the ground with a shield excavator to construct the lining body main body. A gap between the lining body main body and the excavation hole is filled with a backfill filler later.

[0017] Thus, since the convex portion and the concave portion formed in the segment are provided on the outer peripheral surface of the lining body main body, the bonding strength with the back filling material is increased. Moreover, there is no need to perform any special work on site to obtain such an effect.

According to a ninth aspect of the present invention, there is provided a shield construction method for constructing a tunnel, wherein a segment forming a lining body of the tunnel is provided with an outer periphery of the tunnel when the segment is assembled. A hole is formed in the side surface, and the segments are assembled in an excavation hole formed in the ground with a shield excavator to construct the lining body, and thereafter, the lining body and the excavation The gap between the hole and the back filling material is filled, the lining body, after the tail seal of the shield excavator passes through the hole, the pin from the hole to the outer peripheral surface side of the segment. It is characterized by protruding toward.

Thus, after the lining body is constructed and the backfill filler is filled, the pins are made to project toward the outer peripheral surface of the segment. Fixed. In the constructed tunnel, the pins protrude from the outer peripheral surface of the lining body, thereby increasing the adhesive strength between the lining body and the backfill material.
Further, at the time of construction, the pin is projected after the tail seal of the shield excavator passes through the hole formed in the segment, so that the pin does not contact the tail seal.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to third embodiments of a shield tunnel, a segment used for the tunnel, and a shield method according to the present invention will be described with reference to FIGS.

[First Embodiment] As shown in FIG.
The shield tunnel 1 has, for example, a circular cross section and a lining body 3 built in a digging hole 2 formed in the ground G, an outer peripheral surface of the lining body 3 and an inner peripheral surface of the digging hole 2. And a backing filler 4 such as concrete, mortar, fiber concrete or the like, which is filled in the gaps.

The lining body main body 3 is formed by assembling a plurality of steel segments S1. As shown in FIGS. 1 and 2, each segment S1 has an outer surface 5 which is a surface on the outer peripheral side of the lining body main body 3 when assembled.
In addition, irregularities (concave portions, convex portions) 6 for increasing the adhesive strength with the back filling material 4 (see FIG. 1) are formed. The unevenness 6 is formed by, for example, welding a plurality of flat bars (steel members) 7 arranged on the outer surface 5 of the segment S1 in a substantially lattice shape in plan view.

In the shield tunnel 1 having such a configuration, the adhesive strength between the lining body 3 and the backfill 4 is greatly increased by the unevenness 6.

As shown in FIG. 3, in order to construct the shield tunnel 1, similarly to a normal shield tunnel, the ground G is excavated by the cutter mechanism 11 provided at the front of the shield excavator 10, and the excavation hole is formed. While forming 2, the segment S1 is assembled into a predetermined shape in the skin plate 12 behind it. Further, the inner peripheral surface of the excavation hole 2 and the lining body
Is filled with the backfill filler 4 in the space between the backfill filler 4 and the outer peripheral surface of the backfill.
The propulsion jack 1 provided in the skin plate 12
At 4, the shield excavator 10 is propelled by obtaining a reaction force at the front end face of the lining body 3 constituted by the assembled segments S1.

In addition, at the rear end of the skin plate 12,
Although a tail seal 15 is provided to close the gap between the inner peripheral surface of the skin plate 12 and the lining body 3, compared with the particle size of the coarse aggregate of the concrete constituting the backfill 4, If the height of the unevenness 6 formed in the segment S1 is large, the backfill 4 may enter the skin plate 12 from the gap between the tail seal 15 and the segment S1. On the other hand, in order to increase the adhesion between the irregularities 6 and the backfill 4, it is necessary to increase the height of the irregularities 6. In order to satisfy such conflicting conditions, the irregularities 6
The height of the coarse aggregate of the backfill 4 is, for example, 20 mm.
If it is about 10 mm, it is preferred to be about 10 mm.

Thereafter, when the backfill filler 4 that has been cast and filled hardens, the lining body main body 3 and the backfill filler 4 are integrated, whereby the shield tunnel 1 is constructed.

As described above, in the shield tunnel 1 and the segment S1 used therein, each segment S1
By attaching the flat bar 7 to the outer surface 5 of the
Irregularities 6 are formed on the outer peripheral surface of the lining body main body 3 composed of these segments S1, and the adhesive strength with the back filling material 4 filled on the outer peripheral side is increased.
To construct such a shield tunnel 1, a flat bar 7 is attached in advance before assembling the segment S1. Thereby, the adhesive strength between the lining body 3 and the backing filler 4 is increased,
These can be integrated, and therefore, it is possible to design such that the load such as earth pressure and water pressure acting on the shield tunnel 1 is covered not only by the lining body 3 but also by the layer of the backing filler 4. Becomes As a result, while ensuring the strength and soundness of the shield tunnel 1, the segment S
1 can be minimized, the cost of the segment S1 can be suppressed, and the entire tunnel can be constructed economically.

Since the flat bar 7 is used to form the unevenness 6, the unevenness 6 can be formed using a commercially available material. Therefore, the segment S1 can be manufactured at low cost, and the above effect can be further remarkable. Moreover, by attaching the flat bar 7 to the segment S1 in advance, the work at the site can be performed in the same manner as the work using a normal segment without any extra work. This can contribute to economical construction.

In the first embodiment, the flat bars 7 are attached in a lattice shape to form the unevenness 6, but the arrangement may be any shape. Further, in place of the flat bar 7, as shown in FIG. 4, the unevenness 6 may be formed by providing a mesh-like expanded metal (steel member) 18 on the outer surface 5 of the segment S1 by welding or the like. And also other materials,
For example, a reinforcing rod or the like may be attached by welding.

Further, as shown in FIG.
The striped steel plate 19 having a large number of projections 19a formed on the outer surface 5 may be welded to the outer surface 5 to form the unevenness 6 by this. Other than this, any material may be adopted as long as the surface can be formed with irregularities.

By the way, the outer surface 5 of the segment S1 itself is formed of a striped steel plate (plate-like material) 19, and the projections 19a are formed as projections for increasing the adhesive strength with the backing filler 4. You may. Of course, other than the striped steel plate 19, it is also possible to use a plate-like material in which protrusions or irregularities are formed in advance on the surface. With such a configuration, a concave portion or a convex portion can be formed in the segment S1 without the need to attach a steel member such as the flat bar 7 and the like, so that the segment production is further facilitated and more economical. Construction is possible.

[Second Embodiment] Next, a description will be given of a second embodiment of a shield tunnel, a segment used therein, and a shield method. Here, for example, by attaching bolts to the segments,
A description will be given using an example in which a convex portion for improving the adhesion to the backing filler is formed. In the second embodiment described below, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 6, the shield tunnel 1 '
The lining body main body 3 is formed by assembling a plurality of steel segments S2. In each segment S2,
On the outer surface 5 which is the outer peripheral side of the lining body main body 3 when assembled, a convex portion 21 for increasing the adhesion strength with the back filling material 4 is formed.

The convex portion 21 is formed by a bolt (pin) 22 having a base portion 22a fixed to the inner peripheral surface of the segment S2 and a distal end portion 22b provided to extend toward the outer peripheral side. . ing. The bolt 22 is provided with a bolt hole (hole) 2 formed at a predetermined position on the outer surface 5 of the segment S2.
3 so as to protrude to the outside. In order to fix the base end portion 22a of the bolt 22 to the segment S2, the bolt 22 is screwed to a nut 24 attached to the inner peripheral surface of the segment S2 by welding or the like.

At this time, if the out-of-plane strength of the outer surface 5 of the segment S2 is insufficient, a rib-like reinforcing member 25 is provided around the nut 24 by welding or the like, as shown in FIG.

As shown in FIG. 8, to construct a shield tunnel 1 'using the segment S2, a normal shield excavator 10 is used as in the first embodiment. Then, the ground G is excavated by the cutter mechanism 11 provided at the front part of the shield excavator 10, the excavation hole 2 is formed, and the backfill filling is performed while assembling the segment S2 into a predetermined shape in the skin plate 12 behind the excavation hole 2. The back filling material 4 is filled by the material filling mechanism 13. Then, the propelling jack 14 provided in the skin plate 12 obtains a reaction force on the front end face of the lining body main body 3 constituted by the assembled segments S2, and propells the shield excavator 10.

On the other hand, in the skin plate 12,
At the stage where the nut 24 is located in front of the tail seal 15 provided at the rear end of the skin plate 12, the bolt 22 is attached to the nut 24 previously attached to the inner peripheral surface of the assembled segment S <b> 2. Screw. At this stage, only the tip is screwed in so that the bolt 22 does not protrude to the outer peripheral surface of the segment S2. This is to prevent the tail seal 15 from being damaged by the bolt 22. In addition, when the tail seal 15 passes, since there is no projection on the outer surface 5 of the segment S2, the penetration of the backfill 4 into the skin plate 12 is reliably prevented.

After the tail seal 15 passes through the bolts 22 screwed into the nuts 24 with the excavation of the shield excavator 10, the bolts 22 are completely removed until the backfill 4 is hardened. Screw it in. As a result, the bolt 22 is set in a predetermined state, and projects to the outer peripheral side of the lining body 3. Thereafter, when the backfill filler 4 that has been cast and filled hardens, the lining body main body 3 and the backfill filler 4 are integrated, and the bolts 22 are fixed to the backfill filler 4, thereby forming a shield tunnel. 1 'is constructed.

As described above, in the shield tunnel 1 ′, the segment S 2 used therein, and the shield method, the convex portion 21 is formed on the outer peripheral surface of the lining body 3 by the bolt 22. As in the first embodiment, the adhesive strength between the lining body 3 and the backing filler 4 is increased, and the load such as earth pressure or water pressure acting on the shield tunnel 1 ′ is reduced only by the lining body 3. Instead, it can be designed to cover even the layer of the backfill 4.
As a result, while ensuring the strength and soundness of the shield tunnel 1 ', the thickness of the members of the segment S2 can be minimized, and the cost of the segment S2 can be reduced to economically construct the entire tunnel. Becomes possible.

Moreover, since the bolt 22 has a thread formed on the outer peripheral surface thereof, the unevenness of the thread makes the back filling material 4
Is further improved.

Further, by using the bolts 22 and the nuts 24, the segment S2 can be manufactured at low cost by using a commercially available material, and the above effect can be further remarkable. Furthermore, at the time of construction, it is sufficient to simply screw in the bolt 22, which is excellent in workability.

Moreover, after the tail seal 15 has passed,
The bolt 22 is screwed and protruded until the backfill 4 is hardened. Thereby, when the tail seal 15 passes, the outer surface 5 of the segment S2
Since there is no projection at all, the back filling material 4 can be reliably prevented from entering the skin plate 12. In addition, since the tail seal 15 can be prevented from being damaged by the bolt 22, maintenance of the shield excavator 10 can be facilitated, and in this respect also contributes to the economical construction of the shield tunnel 1 '. can do.

[Third Embodiment] Next, a third embodiment of a shield tunnel, a segment used for the tunnel, and a shield method will be described. Here, for example, an example will be described in which a protruding portion for improving the adhesion to the backing filler is formed by attaching a protrudable pin to the segment. In the third embodiment described below, components common to the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 9, the shield tunnel 1 "
Steel segments S3 constituting the lining body main body 3
The lining body main body 3
On the outer surface 5 which is the outer peripheral side of the, a convex portion 31 for increasing the adhesive strength with the back filling material 4 is formed.

As shown in FIGS. 9 and 10, the projection 31 is formed by a pin 32.
2 has a structure in which a base end 32a is fixed to a female member 33 attached to the inner peripheral surface of the segment S3.

The female member 33 is integrally attached to a predetermined position on the inner peripheral surface of the segment S3 by welding or the like.
The female member 33 is formed with a tapered pin hole 34 whose diameter gradually decreases as approaching the inner peripheral surface of the segment S3. In the segment S3, a hole 35 having a diameter larger than the upper part of the pin hole 34 (outer side of the segment S3) and smaller than the outer diameter of the female member 33 is formed at a position corresponding to the pin hole 34. ing.

The pin 32 is provided with a pin hole 34 at the base end 32a.
A tapered portion (locking portion) 36 that protrudes in the radial direction of the pin 32 is formed corresponding to the shape of the pin 32, and a substantially disk-shaped locking member 37 is attached to the tip end. In addition,
The locking member 37 has an outer diameter larger than that of the upper part of the pin hole 34 (the outer surface side of the segment S3), and
The diameter of the outer surface 5 of the segment S3 is set to be smaller than that of the third hole 35 and the thickness thereof is set to be smaller than the thickness of the steel plate constituting the outer surface 5 of the segment S3. Further, the locking member 37 may be attached to the pin 32 by welding or the like. However, if a thread is formed at the tip of the pin 32 and screwed into this, mounting can be easily performed.

In the case of the segment S3 employing such a pin 32, the pin 32 is inserted into the pin hole 34 of the female member 33 before the segment S3 is assembled at the time of construction.
And the hole 35 of the segment S3 in a state of being inserted in advance. At this time, the pins 32 are prevented from falling off by the tapered portions 36 and the locking members 37 projecting outward at both ends of the pins 32.

As in the case of the bolt 22 shown in FIG. 8, when constructing the shield tunnel 1 ″, the pin 32 is not inserted until the tail seal 15 (see FIG. 8) of the shield excavator 10 passes. The state in which the locking member 37 is housed in the hole 35 of the assembled segment S3 (FIG. 9)
(The state shown by the middle dotted line) to prevent the tail seal 15 from being damaged. Then, after the tail seal 15 passes through the pin 32, the pin 32 is removed from the segment S3 before the back-filling material 4 cast and filled on the outer peripheral side of the segment S3 hardens.
And project from the inside to the outer peripheral side.

At this time, since the tapered portion 36 of the pin 32 and the pin hole 34 of the female member 33 are tapered,
2 can be easily positioned. Moreover, since the pin 32 does not need to be screwed, the workability is excellent.

Thereafter, when the backfill 4 is hardened, the lining body 3 and the backfill 4 are integrated, and the position of the locking member 37 is fixed, whereby the pin 32 is fixed. Will be. Moreover, after hardening, the fixing strength of the pin 32 to the segment S3 is very high due to the engagement between the tapered portion 36 and the pin hole 34, and the adhesion strength between the lining body 3 and the backfill 4 is further increased. Can be

As described above, in the shield tunnel 1 ″, the segment S 3 used therein, and the shield method, the projections 31 are formed on the outer peripheral surface of the lining body 3 by the pins 32. As in the second embodiment, the thickness and the like of the segment S3 can be minimized while ensuring the strength and soundness of the shield tunnel 1 ", and the cost of the segment S3 can be reduced to reduce the entire tunnel. It becomes possible to construct economically.

Further, at the time of construction, it is sufficient to simply push the pin 32, which is very excellent in workability.

Further, after the tail seal 15 has passed,
The pin 32 is made to protrude until the backing filler 4 is hardened. As a result, when the tail seal 15 passes, the pin 32 is attached to the outer surface 5 of the segment S3.
Does not protrude, and the locking member 37 at the distal end of the pin 32 is also accommodated in the hole 35, so that no projection exists on the outer surface 5 of the segment S3. Therefore, it is possible to reliably prevent the backfill 4 from entering the skin plate 12 without impairing the sealing property of the tail seal 15, and furthermore, to prevent the tail seal 15 from entering.
Of the shield excavator 1 by preventing the
The maintenance of the shield tunnel 1 "can be facilitated, and this also contributes to the economical construction of the shield tunnel 1".

In the second and third embodiments, the protrusions 21 and 31 are formed by the bolts 22 and the pins 32. However, the number of the protrusions may be appropriately set according to required conditions. For example, they may be arranged in two or three or more rows.

Also, as for the shapes and configurations of the bolts 22 and the pins 32, any other than those mentioned above may be employed as long as the adhesion strength between the lining body main body 3 and the backfill 4 can be increased. You may.

Although the steel segments S1, S2 and S3 are used in the first to third embodiments, the technique of the present invention can be applied to concrete segments. In the case of a concrete segment, the irregularities may be formed by molding during the production of the segment. If the bolts 22 or the pins 32 are used, they may be fixed by an anchor member or the like. Of course, a configuration may be employed in which a concave portion is formed on the outer surface of the segment in addition to the unevenness 6 and the convex portions 21 and 31. Further, the flat bar 7, the expanded metal 18, the striped steel plate 19, the bolt 22, the pin 32, and the like provided for forming the concave portion and the convex portion are used in combination with a plurality of them. Is also good.

Further, the shield tunnel 1, 1 ', 1 "
Is not limited to a circular cross section, but may be shield tunnels having various cross-sectional shapes. For example, the above configuration can be applied to a tunnel having any structure, such as a shield tunnel 41 having a rectangular cross section and a plurality of spaces as shown in FIG.

In addition, the shield excavator to be used is not limited to the above-described shield excavator 10, and may have any configuration. For example, a press mechanism or the like for pressing the filled back filling material 4 may be provided in order to enhance the filling property of the back filling material 4.

Other than this, any configuration may be adopted as long as it does not depart from the gist of the present invention, and it is needless to say that the above-described configurations may be appropriately selectively combined. No.

[0061]

As described above, according to the shield tunnel of the first aspect, the outer peripheral surface of the lining body composed of a plurality of segments adheres to the backing filler on the outer peripheral side. In order to increase the strength, one or both of the convex portion and the concave portion are formed. Thereby, the adhesion strength between the lining body main body and the backfill filler is increased, so that the lining body main body and the backfill filler can be integrated. Therefore, it is possible to design the segment and the layer made of the backfill material to bear a load such as an earth pressure or a water pressure acting on the tunnel. As a result, while securing the strength and soundness of the tunnel, it is possible to economically construct the entire tunnel by minimizing the thickness of the members of the segment and the like, suppressing the cost of the segment.

According to the second aspect of the present invention, one or both of the convex portion and the concave portion are formed on the segment in order to increase the adhesive strength with the backing filler. Thus, if such a segment is used when constructing a tunnel, the tunnel according to claim 1 can be realized.

According to the third aspect of the present invention, the steel member is attached to the segment, so that the convex portion and the concave portion are formed. According to the segment of the fourth aspect, the segment is formed from a plate-shaped material having a surface with irregularities, so that the convex portion and the concave portion are formed. According to these segments, the concave portions and the convex portions can be formed using a commercially available material such as a flat bar, an expanded metal, a reinforcing bar, or a striped steel plate. Therefore, a segment can be manufactured at low cost, and if such a segment is manufactured in advance, the work on site does not require extra labor and the work in the case of using a normal segment is not required. Similarly, it can be easily performed.

According to the segment of the fifth aspect, a pin is provided in which the base end is integrally fixed to the segment. By providing the pins in this manner, a convex portion is formed on the segment, and the adhesion strength between the segment and the backing filler can be increased.

According to the sixth aspect of the present invention, a bolt is used as a pin, and the bolt is fixed to a nut attached to the inner peripheral surface of the segment. By using the bolts as the pins in this manner, the pins can be easily set, and this also contributes to cost reduction. further,
The screw formed on the outer peripheral surface of the bolt also has the effect of further increasing the adhesive strength to the backfill filler.

According to the segment according to the seventh aspect, the locking portion is formed at the base end of the pin, and the pin is fixed by locking the locking portion into the hole formed in the segment. It has a configuration. Thus, since the pin setting operation is completed only by driving the pin from the inner peripheral side of the segment, it is possible to contribute to cost reduction by facilitating the operation also in this point.

According to the shield method according to claim 8, one or both of the convex portion and the concave portion are previously formed in the segment, and the segment is assembled to form the lining body. The gap between the lining body main body and the excavation hole is filled with the backfill filler. Thereby, the shield tunnel according to claim 1 can be constructed. In addition, at the time of construction, there is no need to perform any special work for forming the convex portions and the concave portions, the construction can be easily performed, and the shield tunnel can be constructed economically.

According to the shield method of the ninth aspect, a hole is formed in the segment in advance, and the segment is assembled to form a lining body.
After the tail seal of the shield excavator passes through the hole, the pin is projected from the hole toward the outer peripheral surface side of the segment. When the pin is protruded to the outer peripheral surface side of the segment in this way, if the back filling material cast on the outer peripheral side hardens, this pin is fixed in a protruding state,
This means that the convex portion is formed on the lining body main body. This also enables the construction of the shield tunnel according to claim 1. In addition, during construction, the pin is projected after the tail seal of the shield excavator passes through the hole formed in the segment, so that the pin does not contact the tail seal, making maintenance of the shield excavator easier. Therefore, economical construction of the shield tunnel can be realized.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a shield tunnel, a segment used for the shield tunnel, and a shield method according to the present invention, and is an elevational sectional view of the shield tunnel.

FIG. 2 is a perspective view showing an example of the segment and showing a part of an outer surface of the segment on which irregularities are formed.

FIG. 3 is a side sectional view showing a state where a shield tunnel is being constructed by applying the shield method.

FIG. 4 is a perspective view showing another example of the segment.

FIG. 5 is a plan view showing still another example of the segment and showing an outer surface of the segment.

FIG. 6 is a vertical sectional view of the shield tunnel according to a second embodiment of the shield tunnel, a segment used for the shield tunnel, and a shield method according to the present invention.

FIG. 7 is a plan view and a side sectional view showing a reinforcing member for reinforcing the segment.

FIG. 8 is a side sectional view showing a state where a shield tunnel is constructed by applying the shield method.

FIG. 9 is a side sectional view showing a part of the shield tunnel according to a third embodiment of the shield tunnel, the segment used therein, and the shield method according to the present invention.

FIG. 10 is a perspective view showing a main part of the segment.

FIG. 11 is an elevational sectional view showing another example of a shield tunnel, a segment used therein, and a shield method according to the present invention.

[Explanation of symbols]

 1, 1 ', 1 ", 41 shield tunnel 2 excavation hole 3 lining body 4 back filling material 6 unevenness (concave, convex) 7 flat bar (steel member) 15 tail seal 18 expanded metal (steel member) 19) Striped steel plate (plate-like material) 21, 31 Convex portion 22 Bolt (pin) 23 Bolt hole (hole) 32 Pin 35 hole 36 Tapered portion (locking portion) G Ground S1, S2, S3 Segment

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Minoru Imai 2-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Yasuhiko Shigeta 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Hiroaki Inoue Shimizu Construction Co., Ltd. 1-3-2 Shibaura, Minato-ku, Tokyo

Claims (9)

[Claims] A lining body is formed by assembling a plurality of segments in an excavation hole formed in the ground, and a gap between an outer peripheral surface of the lining body and an inner peripheral surface of the excavation hole is provided. In the outer peripheral surface of the lining body main body, in order to increase the adhesion strength with the backing filler, one or both of the convex portion and the concave portion are provided. A shield tunnel characterized by being formed. 2. A segment used as a lining body of a tunnel, wherein the segment has a backing which is cast on an outer peripheral surface of the tunnel when the segment is assembled. A segment, characterized in that one or both of a convex portion and a concave portion are formed in order to increase the adhesive strength with a filler. 3. The segment according to claim 2, wherein the convex portion and the concave portion are formed in the segment by attaching a steel member to an outer peripheral surface of the tunnel. Segment to be used. 4. The segment according to claim 2, wherein the segment is a plate-like material in which at least one of a convex portion and a concave portion is formed on the outer surface of the tunnel. A segment characterized by being composed. 5. The segment according to claim 2, wherein a pin is fixed to the surface of the outer circumferential side of the tunnel, the base end of which is integrally fixed to the segment. A segment, wherein the projection is formed by projecting a tip end of the tunnel toward an outer peripheral side of the tunnel. 6. The segment according to claim 5, wherein a bolt is used as the pin, and the bolt has a base end fixed to a nut attached to an inner peripheral surface side of the segment, and is connected to the segment. A segment provided so as to protrude from a formed hole to an outer peripheral side thereof. 7. The segment according to claim 5, wherein a locking portion that protrudes in a radial direction of the pin is formed at a base end portion of the pin, and the pin is formed through a hole formed in the segment. A segment provided so as to protrude to the outer peripheral side, wherein the base portion of the pin is fixed by locking the locking portion to the hole. 8. A shield method for constructing a tunnel, wherein a segment forming a lining body of the tunnel has a surface which is formed on the outer peripheral side of the tunnel when the segment is assembled. One or both of the portion and the concave portion are formed, and the segments are assembled into an excavation hole formed in the ground with a shield excavator to construct the lining body, and thereafter the lining body is formed. And a gap between the hole and the excavation hole is filled with a backfill filler. 9. A shield construction method for constructing a tunnel, wherein a segment forming a lining body of the tunnel is provided with a hole in a surface on an outer peripheral side of the tunnel when the segment is assembled. And forming the lining body by assembling the segments in a digging hole formed in the ground with a shield digging machine, and then setting a back face in a gap between the lining body and the digging hole. After the tail seal of the shield excavator passes through the hole, the pin is projected from the hole toward the outer peripheral surface side of the segment. Characteristic shield method.