JP5634920B2 - Shield tunnel connection structure - Google Patents

Description

  The present invention relates to a connection structure between a shaft and a shield tunnel end.

Earthquake response characteristics differ between a shaft and a tunnel extending from the shaft.
For this reason, when an earthquake occurs, the vertical shaft and the tunnel behave differently, and the connection between the vertical shaft and the tunnel may be damaged.
Therefore, by interposing an elastic member between the shaft and the end portion of the shield tunnel, different behaviors of the shaft and the shield tunnel are absorbed.

  In connection with a shaft and a shield tunnel end in Patent Document 1, the applicant of the present application has a problem of achieving both high sealing performance and easy construction, with the shaft and the shield tunnel end interposed between elastic members. A structure and method for connecting were proposed.

JP 2010-222291 A

However, the elastic member of Patent Document 1 can be formed only up to 50 × 50 mm in shape, and therefore can only cope with a shape whose allowable displacement is limited to 25 mm (in the direction of tension, compression, and shear).
Further, when the shape of the elastic member becomes large, the elastic member is subjected to soil water pressure, which causes a structural problem.

The subject of this invention is increasing the allowable displacement amount of the elastic member interposed between a shaft and a shield tunnel edge part.
Furthermore, this invention also makes it the subject to improve the load bearing performance of an elastic member.

In order to solve the above problems, the invention described in claim 1
It is a structure that connects the shaft and the shield tunnel end through an elastic member,
A partition member for dividing the elastic member into a plurality of parts ;
A pair of fixing members that are bonded to both ends of the elastic member and fixed to the shaft and the shield tunnel end respectively;
A bolt penetrating through the pair of fixing members and the partition member therebetween;
A nut coupled to the bolt;
It is characterized by providing.

  A second aspect of the present invention is the shield tunnel connection structure according to the first aspect, wherein a plurality of the partition members are provided.

  According to the present invention, the allowable displacement amount of the elastic member interposed between the shaft and the shield tunnel end can be increased.

1 shows a configuration of one embodiment of a shield tunnel connection structure to which the present invention is applied, and is a central longitudinal sectional view (a) including a peripheral structure portion at the end of a shield tunnel, and a front view (b) of a fixing member of the flex ring. ). FIG. 2 is an enlarged detail view of an arrow A part in FIG. It is the front view (a) and sectional drawing (b) which expanded a part of fixing member and partition member of the flex ring of FIG. It is the figure which showed the time of the tensile deformation of the flex ring of FIG. It is the figure which showed the time of the compression deformation of the flex ring of FIG. It is the figure which showed the time of the shear deformation of the flex ring of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
(Embodiment)
FIG. 1 shows a configuration of an embodiment of a shield tunnel connection structure to which the present invention is applied. 1 is a retaining wall, 2 is concrete, 3 is a shield tunnel, 4 is a segment, 5 is a backfilling injection material, 6 Is a flex ring.

As shown in the figure, on the earth retaining wall 1 of the start shaft of the shield machine (not shown), concrete 2 is placed on the inner periphery of the excavation hole after the shield machine is started, and is covered with the shield tunnel 3. The backfilling injection material 5 is injected into the outer periphery of the end of the segment 4.
Then, the end of the segment 4 and the concrete 2 are connected via a flex ring 6.

  FIG. 2 is an enlarged view of an arrow A portion in FIG. 1, and the flex ring 6 includes a pair of fixing members 7, a plurality of partition members 8 therebetween, and a space between the fixing members 7 and the partition members 8. The elastic member 9, the bolt 11 and the nut 12 that fix the fixing member 7 to the end face of the segment 4, the ceramic insert 13 that fixes the fixing member 7 to the end face of the concrete 2, and the fixing member 7 and the partitioning member 8 are connected through. Long bolts 14 and nuts 15, and a spring 16 interposed between the fixing member 7 and the partition member 8.

As shown in the figure, the flex ring 6 includes a plurality of (two in the illustrated example) stainless steel plate partition members 8 between a pair of stainless steel plate fixing members 7 and a paste-like material mainly composed of silicon, polyurethane, or the like. A plurality of (three in the illustrated example) elastic members 9 having excellent deformability, water pressure resistance, durability, and workability are alternately laminated by bonding with a sealing adhesive. Become.
Thus, in the illustrated example, the elastic member 9 is divided into three parts by the two partition members 8.

The fixing member 7 on the left side of the figure is fixed by a ceramic bolt 11 and a nut 12 on the outer peripheral side of the elastic member 9 with a rubber plate made of a sealing material interposed between the side plate at the end of the segment 4. The
Further, the fixing member 7 on the right side in the figure is fixed on the outer peripheral side of the elastic member 9 by a ceramic insert 13 that is bonded to a reinforcing bar in advance from the end surface of the concrete 2.

Further, the fixing member 7 and the partition member 8 are inserted loosely through the long bolts 14 on the inner peripheral side of the elastic member 9, and a nut 15 is coupled to the tip of the long bolt 14.
A compression type coil spring 16 is interposed between the fixing member 7, the partition member 8, and the nut 15.
In addition, the front-end | tip side of the long volt | bolt 14 and the part of the nut 15 have faced the recessed part 2a formed in the end surface of the concrete 2 like illustration.

  The flex ring 6 described above has a fan shape corresponding to the end face of the segment 4 and is configured in a ring shape as a whole corresponding to the segment ring forming the shield tunnel 3.

A back-up material 17 made of polystyrene foam is filled between the concrete 2 and the backfilling injection material 5 on the outer peripheral side of the elastic member 9 of the ring-shaped flex ring 6.
Further, the inner peripheral side of the fixing member 7 and the partition member 8 of the ring-shaped flex ring 6 is closed with a fireproof blanket 18 from the concave portion 2a of the concrete 2 end surface to the inner periphery of the end face plate of the segment 4.

  FIG. 3 is an enlarged view of a part of the fixing member 7 and the partition member 8 of the flex ring 6. As shown in the drawing, a long hole 7 a for loosely engaging a long bolt 14 on the inner peripheral side of the fixing member 7. Is formed, and a long hole 8 a for loosely engaging the long bolt 14 is also formed on the inner peripheral side of the partition member 8.

  In addition, as shown in FIG.1 (b), the round hole 7b which lets the volt | bolt 11 or the ceramic insert 13 pass is formed in the outer peripheral side of the fixing member 7. FIG.

  In the above, the flex ring 6 between the end portion of the segment 4 and the concrete 2 includes the elastic force provided by the elastic member 9 and the compression type coil spring 16 interposed between the fixing member 7, the partition member 8 and the nut 15. In the normal state, the positional relationship shown in FIG. 2 is maintained.

  FIG. 4 shows the flex ring 6 during tensile deformation. When the distance between the end of the segment 4 and the concrete 2 increases due to an earthquake, the fixing member 7 is moved along the horizontal long bolt 14 as shown in the figure. And the partition member 8 moves, respectively, and the elastic member 9 in between is deform | transformed in the state each pulled.

  FIG. 5 shows the flex deformation of the flex ring 6, and when the distance between the end of the segment 4 and the concrete 2 is reduced due to an earthquake, the fixing member 7 is moved along the horizontal long bolt 14 as shown in the figure. And the partition member 8 moves, respectively, and the elastic member 9 in the meantime deform | transforms into the state compressed.

  FIG. 6 shows the flex ring 6 at the time of shear deformation. When a shear force acts on the end of the segment 4 and the concrete 2 due to an earthquake, the fixing member 7 is moved along the long bolt 14 as shown in the figure. The partition member 8 is moved in the shearing direction by the long holes 7a and 8a, respectively, and the elastic member 9 therebetween is deformed in the shearing direction.

  As described above, the flex ring 6 secures flexibility by restricting the flex ring 6 while allowing displacement only in the load acting direction of the earthquake.

  As described above, according to the flex ring 6 of the embodiment, between the pair of fixing members 7 that are respectively fixed to the concrete 2 on the inner periphery of the retaining wall 1 of the shaft and the end of the shield tunnel 3, two partition members 8 divides into three elastic members 9, the allowable displacement can be increased.

  Further, since the nut 15 is coupled to the long bolts 14 which are inserted into the long holes 7a and 8a of the pair of fixing members 7 and the partition member 8 therebetween, the load bearing performance of the elastic member 9 can be improved. it can.

(Modification)
In the above embodiment, the connection structure between the start shaft and the shield tunnel is used. However, the present invention is not limited to this, and may be applied to a connection portion with an intermediate shaft or a reaching shaft.
Moreover, you may use for the connection of a manhole and a sewer pipe.

Furthermore, in the embodiment, the bolt through holes of the fixing member and the partition member are long holes, but round holes having a larger diameter than the bolts may be used.
Also, the cross-sectional shape of the tunnel, the method of fixing the steel material, the type of segment (made of reinforced concrete, steel, etc.), the material of each member, etc. are arbitrary, and other specific details such as the structure can be changed as appropriate. Of course.

DESCRIPTION OF SYMBOLS 1 Earth retaining wall 2 Concrete 2a Recess 3 Shield tunnel 4 Segment 5 Backfilling injection material 6 Flex ring 7 Fixing member 7a Long hole 7b Round hole 8 Partition member 8a Long hole 9 Elastic member 11 Bolt 12 Nut 13 Ceramic insert 14 Bolt 15 Nut 16 Coil spring 17 Backup material 18 Fireproof blanket

Claims (2)

It is a structure that connects the shaft and the shield tunnel end through an elastic member,
A partition member for dividing the elastic member into a plurality of parts ;
A pair of fixing members that are bonded to both ends of the elastic member and fixed to the shaft and the shield tunnel end respectively;
A bolt penetrating through the pair of fixing members and the partition member therebetween;
A nut coupled to the bolt;
A shield tunnel connection structure characterized by comprising:   The shield tunnel connection structure according to claim 1, comprising a plurality of the partition members.

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