JP2012072607A - Manufacturing method of segment and manufacturing facility of segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce transportation of segments from the outside of an excavation site to the inside of the excavation site and to enlarge the segments.SOLUTION: Natural ground G is excavated by a shield machine, and a plurality of segments 1 are connected inside an excavation hole in the rear of the shield machine to construct a cylindrical wall body 2. Inside a rear cylindrical wall body 5 at the rear part in an excavating direction constructed in advance among the cylindrical wall bodies, a front segment (segment) 8 to construct a front cylindrical wall body in front of the rear cylindrical wall body 5 in the excavation direction is manufactured.

Description

  The present invention relates to a method for manufacturing a segment and a facility for manufacturing a segment that form a cylindrical wall body in the axial direction of an excavation hole by connecting a plurality of them together.

  As a tunnel construction method, there is a shield construction method that constructs a cylindrical tunnel wall body (cylindrical wall body) by excavating the ground with a shield machine and subsequently installing arc-shaped segments in the circumferential direction and axial direction behind it. It is common. As a segment used in this shield method, for example, a concrete segment, a steel segment, or a composite segment using a combination of steel and concrete is known, and Patent Document 1 discloses an example of a composite segment. .

Japanese Patent No. 3330664

Such a segment is manufactured at a site near a factory or excavation site and transported to the excavation site. For this reason, it takes time and cost to transport the segment to the excavation site.
Moreover, since it is necessary to make the segment into a shape that can be transported by a vehicle due to regulations of the Road Traffic Law, it is difficult to increase the size of the segment.
In addition, when a segment is manufactured at a site near the excavation site, it takes effort and cost to secure this site and to restore the site after the tunnel is completed.

  The present invention has been made in view of the above-described problems, and can reduce the transportation of the segment from the outside of the excavation site to the inside of the excavation site and can increase the size of the segment. The purpose is to provide manufacturing equipment.

  In order to achieve the above object, a method for manufacturing a segment according to the present invention is a tunnel construction in which a ground wall is excavated by a shield machine, and a plurality of segments are connected in an excavation hole behind the shield machine to construct a cylindrical wall body. And manufacturing a segment for constructing a front cylindrical wall body ahead in the excavation direction with respect to the rear cylindrical wall body in a rear cylindrical wall body behind the excavation direction constructed in advance among the cylindrical wall bodies. It is characterized by that.

  The segment manufacturing facility according to the present invention is a segment manufacturing facility for manufacturing a segment for constructing a cylindrical wall body formed in a drilling hole behind a shield machine for excavating natural ground, the cylindrical wall Provided in the rear cylindrical wall in the rear of the excavation direction constructed in advance among the body, and provided with a formwork for the segment that constructs the front cylindrical wall in the front of the excavation direction than the rear cylindrical wall It is characterized by

In the present invention, a segment for constructing a front cylindrical wall body ahead in the excavation direction with respect to the rear cylindrical wall body is manufactured in the rear cylindrical wall body rearward in the excavation direction constructed in advance among the cylindrical wall bodies. This makes it possible to reduce labor and cost for transporting the segment compared to the case where the segment of the front cylindrical wall body is manufactured at a factory and transported to the excavation site.
In addition, since the segment of the front cylindrical wall body is not loaded on the vehicle and transported on the road, the shape of the segment of the front cylindrical wall body is not restricted by the Road Traffic Act, and the front cylindrical wall The body segment can be enlarged. Thereby, the joint of the segments of a front cylindrical wall body can be decreased, and the effort concerning the connection of the segments of a front cylindrical wall body can be reduced. In addition, since the number of joint portions that easily deteriorate is reduced, the quality of the cylindrical wall body can be kept high.
Further, since the number of segments is smaller than before due to the increase in size of the segments, it is possible to reduce labor for managing the segments.

Further, in the method for manufacturing a segment according to the present invention, a concrete placing step for placing concrete on a mold of the segment of the front cylindrical wall body, and the mold is removed from the segment after the concrete is cured. A curing process for curing the segment, and the curing process is preferably performed by moving the segment to the shield machine side of the mold.
In the present invention, the curing process is performed by moving the segment to the shield machine side from the mold, so that the segment is moved to the shield machine side in the process of manufacturing the segment. Thereby, the conveyance distance to the installation location of the segment in a cylindrical wall body can be shortened, and the effort concerning the conveyance of the segment in a cylindrical wall body can be reduced, and time reduction can be aimed at.

Moreover, in the segment manufacturing method according to the present invention, in the concrete placing step, it is preferable to place high-fluidity concrete on the mold fixed at a fixed position.
In the present invention, since the mold is fixed at a fixed position, the segment can be manufactured without moving the mold, so that the process can be simplified.
In addition, by placing high-fluidity concrete, it is not necessary to perform compaction by vibration when filling concrete into the formwork, so facilities such as a vibration table for compaction are not required and facilities for manufacturing segments Can be reduced and the process can be simplified.

Moreover, in the manufacturing method of the segment which concerns on this invention, you may perform the said curing process in the automatic warehouse which can go in and out of the said segment.
In the present invention, by performing the curing process in an automatic warehouse capable of managing the access of the segment, the segment can be easily stored together with the curing of the segment.

In the segment manufacturing method according to the present invention, the segment may be a tapered segment.
In the present invention, since the segment is a tapered segment, it can be installed in an excavation hole excavated in a desired shape by combining a predetermined number of tapered segments.

According to the present invention, by producing a segment for constructing the front cylindrical wall body inside the rear cylindrical wall body, compared with the case of manufacturing the segment for constructing the front cylindrical wall body in a factory or the like, Labor and cost for transportation can be reduced.
In addition, since the segments for constructing the front cylindrical wall can be enlarged and the number of joints between the segments can be reduced, the construction period for connecting the segments can be shortened, and there are few joint parts that are likely to deteriorate. The quality of the segment and the cylindrical wall can be kept high.

It is a figure explaining the manufacturing method of a segment by the embodiment of the present invention, and the manufacturing equipment of a segment. FIG. 2 is a partially enlarged view of FIG. (A) is a figure which shows the cylindrical wall body of this embodiment, (b) is a figure which shows the conventional cylindrical wall body.

Hereinafter, a segment manufacturing method and a segment manufacturing facility according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
As shown in FIGS. 1 and 2, in this embodiment, a natural wall G is excavated by a shield machine (not shown), and a plurality of segments 1 are connected in an excavation hole at the rear of the shield machine to form a cylindrical wall body. (Tunnel) 2 is constructed.
Here, in FIG. 1, it is assumed that a shield machine and a face not shown are on the left side in the drawing, and excavation is performed from the right side in the drawing to the left side (direction of arrow A). In the following description, the left side in the figure is the front side (front), and the right side in the figure is the rear side (rear).

The segment 1 is a concrete segment formed in a substantially arc plate shape, and is connected to the axial direction and the circumferential direction of a substantially cylindrical excavation hole to construct a substantially cylindrical tubular wall body 2.
A floor slab 3 is constructed in the middle part in the vertical direction inside the cylindrical wall body 2, and a road is constructed on the floor slab 3, for example.

The lower space 4 of the floor slab 3 is used as a space in which the rear end 4a (see FIG. 1) side manufactures and stores the segment 1 constituting the cylindrical wall body 2 on the front side of the rear end 4a side. Yes.
Here, the rear end 2a side of the cylindrical wall body 2 including the rear end 4a side of the lower space 4 is defined as the rear cylindrical wall body 5, and the cylindrical wall body 2 on the front side of the rear cylindrical wall body 5 is Let it be a front cylindrical wall (not shown). Moreover, the segment 1 that constructs the rear cylindrical wall body 5 will be described as a rear segment 7, and the segment 1 that constructs the front cylindrical wall body will be described as a front segment 8.

The rear cylindrical wall 5 is constructed prior to the front cylindrical wall. The rear segment 7 that constructs the rear cylindrical wall body 5 is manufactured by a known method in a factory or the like, transported to an excavation site, and installed.
After the rear cylindrical wall body 5 is constructed, facilities for manufacturing the front segment 8 are installed in the lower space 4, and the front segment 8 can be manufactured inside the rear cylindrical wall body 5. ing.
The front cylindrical wall body is constructed by the front segment 8 manufactured inside the rear cylindrical wall body 5.

(Segment production equipment)
Next, manufacturing equipment for the front segment 8 will be described.
Manufacturing equipment for the front segment 8 includes a formwork (framework equipment) 11 for the front segment 8, a reversing machine 12 for turning the front segment 8 upside down, an underwater curing tank 13 for underwater curing the front segment 8, and a front segment 8. An automatic warehouse 14 for storage is installed on the rear cylindrical wall 5.

The mold 11 is formed to be divertable and is fixed at a predetermined position. The mold 11 is installed in the direction in which the inner peripheral surface 8a of the front segment 8 is on the lower side. Since the mold 11 is fixed at a fixed position, the concrete C is placed on the mold 11 with a movable hopper or the like.
The concrete C is pumped into the mold 11 by a pump (not shown) from a batcher plant 15 (see FIG. 1) installed on the ground near the rear cylindrical wall 5.

The reversing machine 12 is a device that rotates the front segment 8 from which the mold 11 has been removed to turn it upside down. Since the formwork 11 is installed in the direction in which the inner peripheral surface 8a of the front segment 8 is on the lower side, the front segment 8 from which the formwork 11 is removed is in the direction in which the inner peripheral surface 8a is on the lower side. ing. Then, the segment 1 is set on the reversing machine 12 in this direction and turned upside down, so that the inner peripheral surface 8a becomes the upper side.
The reversing machine 12 is installed on the front side of the mold 11.

The underwater curing tank 13 is comprised in the one part area of the lower space 4 of the back cylindrical wall body 5, as shown in FIG. And the wall body is formed in the front end and rear end of this area, and it is comprised so that water can be accommodated between these wall bodies.
The underwater curing tank 13 is installed on the front side from the reversing machine 12.

The automatic warehouse 14 stores the front segment 8 taken out from the underwater curing tank 13. And the front segment 8 is taken out from the automatic warehouse 14, is conveyed to a digging hole, and is installed so that a front cylindrical wall body may be comprised.
The automatic warehouse 14 manages the entrance / exit of the front segment 8, and manages the entrance / exit of the front segment 8 by detecting, for example, an IC chip or a bar code embedded or attached to the front segment 8.
The automatic warehouse 14 is installed closer to the face than the underwater curing tank 13.

(Segment manufacturing method)
Next, the manufacturing method of the front segment 8 mentioned above is demonstrated.
(Formwork installation process)
First, reinforcing bars (not shown), lid molds, and the like are installed on the mold 11 shown in FIGS. 1 and 2 so that concrete can be placed. At this time, the formwork 11 is installed in the direction in which the inner peripheral surface 8a of the front segment 8 to be formed is on the lower side.
(Concrete placing process)
Subsequently, concrete C is placed in the mold 11 from the concrete inlet formed in the lid mold. At this time, high fluidity concrete is used for the concrete C. In this way, by using high fluidity concrete, self-filling is possible without compacting the concrete C.

Subsequently, curing is performed for a predetermined period until the placed concrete C is hardened.
Then, after the concrete C has hardened, the mold 11 is removed from the formed front segment 8.
Subsequently, the front segment 8 from which the mold 11 has been removed is moved to the reversing machine 12 and rotated so as to be reversed upside down. By this reversal operation, the inner peripheral surface 8a of the front segment 8 faces upward.

(Curing process)
Subsequently, underwater curing of the front segment 8 is performed.
The front segment 8 reversed by the reversing machine 12 is put into the underwater curing tank 13, and underwater curing is performed for a predetermined period. By this underwater curing, the long-term strength of the front segment 8 can be improved.
After underwater curing for a predetermined period, the front segment 8 is taken out from the underwater curing tank 13 and the front segment 8 is stored in the automatic warehouse 14. Note that the front segment 8 may be cured in the automatic warehouse 14.
Thus, the front segment 8 is formed by completing predetermined curing.

Then, the front segment 8 stored in the automatic warehouse 14 is taken out from the automatic warehouse 14 and transported to the face side by the carriage 16 and used for constructing the front cylindrical wall body.
At this time, since the front segment 8 is installed so that the inner peripheral side 1a is on the upper side, the front segment 8 may be moved to the installation location along the inner peripheral surface of the excavation hole. It can be installed easily without having to be turned upside down.

According to the manufacturing method of the front segment 8 by this embodiment, the front segment 8 is manufactured in the factory etc. by manufacturing the front segment 8 which builds a front cylindrical wall body in the rear cylindrical wall body 5 already constructed | assembled. Compared with the case where it manufactures by this, the labor and cost which convey the segment 1 which constructs a front cylindrical wall body from a factory to the field can be saved.
Moreover, since the front segment 8 is not transported on the road, there is no restriction of the shape by the road traffic law, and the size can be increased.
And as shown to Fig.3 (a), the front segment 8 which constructs the front cylindrical wall body 6 is formed larger than the conventional segment 21 of the cylindrical wall body 20 shown in FIG.3 (b). Can do. For this reason, the joints 9 between the front segments 8 can be made smaller than the joints 22 between the conventional segments 21. Thereby, while being able to shorten the construction period concerning the connection of the front segments 8, it is possible to reduce water leakage due to deterioration of the joint.

As mentioned above, although the embodiment of the segment manufacturing method and the segment manufacturing facility according to the present invention has been described, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the scope of the present invention.
For example, in the embodiment described above, the front segment 8 is formed in a substantially arc plate shape, but may be a tapered segment. By using the front segment 8 as a taper segment, a combination of a plurality of types of taper segments allows the cylindrical wall body 2 to be constructed in an excavation hole excavated in a desired shape.
Moreover, in embodiment mentioned above, although the water curing of the front segment 8 is performed, if the intensity | strength of the front segment 8 can fully be ensured, the water curing of the front segment 8 does not need to be performed.

DESCRIPTION OF SYMBOLS 1 Segment 2 Cylindrical wall 3 Floor slab 4 Lower space 5 Back cylindrical wall 7 Rear segment 8 Front segment 11 Formwork (formwork equipment)
14 Automated warehouse C Concrete G Ground

Claims (6)

In tunnel construction that excavates natural ground with a shield machine and constructs a cylindrical wall body by connecting multiple segments in the excavation hole behind the shield machine,
Manufacturing a segment for constructing a front cylindrical wall body ahead of the excavating direction from the rear cylindrical wall body in the rear cylindrical wall body behind the excavating direction constructed in advance among the cylindrical wall bodies. A method for producing a featured segment. A concrete placing step for placing concrete in a formwork of a segment of the front cylindrical wall;
A curing step of curing the segment by removing the formwork from the segment after the concrete has hardened;
The method for producing a segment according to claim 1, wherein the curing step is performed by moving the segment to the shield machine side with respect to the formwork.   3. The method for manufacturing a segment according to claim 2, wherein, in the concrete placing step, high-fluidity concrete is placed on the mold fixed at a fixed position.   The method for manufacturing a segment according to claim 2 or 3, wherein the curing step is performed in an automatic warehouse capable of managing the access of the segment.   The segment manufacturing method according to claim 1, wherein the segment is a tapered segment. A segment manufacturing facility for manufacturing a segment for constructing a cylindrical wall formed in a drilling hole behind a shield machine for excavating natural ground,
A type of segment which is provided in a rear cylindrical wall body behind the excavation direction constructed in advance among the cylindrical wall bodies and constructs a front cylindrical wall body ahead in the excavation direction than the rear cylindrical wall body. A segment manufacturing facility comprising a frame facility.

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