JPH06108793A - Shield process and segment manufacturing facility used therefor - Google Patents

Abstract

PURPOSE:To reduce the labor for transportation and to lower the cost by manufacturing segments with the use of a segment manufacturing facility which is installed in a tunnel in rear of a shield machine for excavating the ground, and by using these segments so as to construct the tunnel. CONSTITUTION:Components 7 is introduced and stocked in a storage bin 8 from a truck 25 which has transported the components 7 from a shaft base 9 on the ground to a base 11, through a material filling pipes 10 and a material press-feed pipe 12. Then the components 7 are delivered from the storage bin 8 by means of a conveyer device 14, and are then shifted onto a material stocker 13. Then, they are introduced into a batches plant 20 by means of a belt conveyer 23, and the components are respectively weighed and are kneaded so as to produce concrete. A reinforcement cage is assembled in a form 24, and then the concrete is placed therein. Then after steam curing in a steam curing chamber 22, a segment A is parted and is then cured underwater. Further, the ground in a tunnel 4 is excavated, the segment A is cylindrically laid in the excavated tunnel 4a by means of an elector mechanism in a shield machine 3. The above-mentioned steps are repeated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield construction method suitable for constructing, for example, a tunnel having an extremely large diameter by a shield construction method and a segment manufacturing facility used for the shield construction method.

[0002]

2. Description of the Related Art In general, a shield method is used to assemble a segment that is a cylindrical divided body in a skin plate while excavating the ground with a cutter device provided in the front part of a shield excavator having a skin plate having an outer cylindrical shape. In addition, a reaction force is applied to the front end of this segment to extend the propulsion jack inside the shield excavator to propel the entire shield excavator forward, and by repeating these steps, a tunnel is built underground. is there.

Conventionally, a segment used for such a shield construction method is manufactured in advance at a factory on the ground, transported from the factory by a truck or the like, transported to the inside of a tunnel to be constructed, and then assembled.

[0004]

However, in the conventional shield construction method as described above, for example, the diameter is 2
When constructing a tunnel with an ultra-large diameter of 0 m or more, the number of segments is close to 10 tons per piece, which is heavy for transporting from factories and underground, and is also extremely difficult to handle. It is a labor-intensive and even dangerous task. Also, if trucks are used for transportation from the factory, many trucks will come and go to the site every day (for example, in order to construct a tunnel with a diameter of 20 m, a wall thickness of 1 m, and a length of 6 m per day, 90 trucks / day for a 10-ton truck). Therefore, there is a vast space for unloading trucks on the ground, and the transportation cost is enormous.

In contrast to the above problems, if the segment is not used and lining with cast-in-place concrete is performed, the reaction force for propelling the shield machine described above cannot be supported and the function of the segment is satisfied. I can't. The present invention has been made in consideration of the above points, and a shield construction method capable of easily and safely supplying a segment to an assembly site in a mine and reducing the cost, and a segment manufacturing apparatus used for the shield construction method. The purpose is to provide.

[0006]

The invention according to claim 1 is
The shield construction method is characterized in that a segment is manufactured in a pre-built mine behind a shield machine for excavating the natural ground, and a tunnel is formed using the manufactured segment.

The invention according to claim 2 is a manufacturing facility for a segment used in a shield construction method, which comprises a supply mechanism for supplying constituents such as cement, aggregate, and water constituting concrete from the ground into the mine, Includes a concrete manufacturing mechanism that mixes concrete from the above components, a casting and compacting mechanism that casts and compacts concrete into a formwork, and a curing mechanism that cures the concrete that is cast and compacted into the formwork. It is characterized by the provision of segment manufacturing equipment.

[0008]

According to the first aspect of the present invention, in the shield construction method, the segment is manufactured in a pre-constructed mine behind a shield machine that advances while excavating the natural ground, and the manufactured segment is assembled in the excavated mine. As a result, a tunnel is formed.

According to the second aspect of the present invention, a supply mechanism for supplying constituents such as cement, aggregate, and water, which constitute concrete, into the mine from above, and a concrete manufacturing mechanism for mixing concrete from the constituents. A segment manufacturing facility including a casting / compacting mechanism for casting / compacting concrete on the formwork and a curing mechanism for curing the concrete poured / compacted on the formwork is provided to produce this segment in the mine. With the equipment, concrete is mixed from the aggregate supplied from the ground, and this concrete is placed in the formwork.
The segment is manufactured by compacting and curing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment for constructing a tunnel by the shield construction method of the present invention will be described below with reference to FIGS. First, as shown in FIG. 1, after a vertical shaft 2 is normally excavated to a predetermined depth in the ground 1, a shield mechanism including a cutter mechanism for excavating natural ground, an erector mechanism for assembling segments, etc. is provided in the vertical shaft 2. The machine 3 is lowered and the bottom of the vertical shaft 2 is excavated in a substantially horizontal direction. FIG. 1 shows a state in which the tunnel 4 is constructed by excavating the shield machine 3 to excavate a predetermined length, for example, 100 m. Segments 5, 5, ... Produced in a factory on the ground are carried into the tunnel 4a, which has already been excavated, in the tunnel 4 and assembled in an annular shape. The transportation of the segment 5 from the factory and the transportation into the mine are only the segments 5, 5, ... For constructing the tunnel 4 of this predetermined length.

Next, a segment manufacturing facility 6 for manufacturing a segment is installed in the downhole 4a as follows. First, in the shaft 2, cement that constitutes concrete,
Tubular storage bottle 8 for storing components 7 such as sand, gravel, and water
Is provided in the vertical direction. The storage bin 8 is provided from a vertical shaft base 9 provided around the above-ground opening 2a of the vertical shaft 2 to the storage bin 8.
A material injection pipe 10 for pumping the composition 7 to the
When the vertical shaft base cannot be taken large, the components 7 are stored in the storage bin 8 from the base 11 provided on the public land near the main road.
A material pressure-feeding pipe 12 for pressure-feeding is embedded in the ground 1.

Next, a material stocker 13 for stocking only the necessary amount of the constituent 7 is provided in the mine 4a on the side of the bottom 8a of the storage bin 8. A conveying device 14 is provided between the material stocker 13 and the supply port 8b of the storage bin 8.
The transfer device 14 includes a rail 14a extending toward the excavation direction of the tunnel 4, and a transport vehicle 14b traveling on the rail 14a transports the component 7 from the storage bin 8 to the material stocker 13 at appropriate times. . A supply mechanism 15 is configured by the storage bin 8, the material injection pipe 10, the material pressure feed pipe 12, the material stocker 13, and the transfer device 14.

Next, partition plates 16 and 16 for shielding the lower part of the tunnel 4 are installed beside the material stocker 13 along the direction in which the tunnel 4 extends at intervals of, for example, about 100 m. As shown in FIG. 2, a waterproof sheet 17 is laid on the bottom of the tunnel 4 between the partition plates 16 and 16. Then, the space surrounded by the partition plates 16 and 16 and the waterproof sheet 17 is filled with water to form an underwater curing tank (curing mechanism) 18. The underwater curing tank 18 is for curing by immersing a segment made of concrete in water for a certain period (for example, about 2 weeks).

Next, a temporary floor 19 having a horizontal surface is provided above the underwater curing tank 18. On the upper surface of this temporary floor 19,
A batcher plant (concrete manufacturing mechanism) 20, a casting / compacting device (casting / compaction mechanism) 21, and a steam curing chamber (curing mechanism) 22 are installed along the excavation direction of the tunnel 4. Further, the belt conveyor 23 is installed between the batcher plant 20 and the material stocker 13. Further, in addition to the above, equipment, equipment, etc. necessary for manufacturing the segment A are installed.

The batcher plant 20 mixes concrete by mixing the automatic measuring mechanism for cement, sand, gravel, water, etc. of the constituent 7 constituting the concrete and the constituent 7 measured by the automatic measuring mechanism. And a kneading mechanism. The pouring / compacting device 21 assembles a rebar cage in which rebars are assembled in the formwork 24 of the segment A to be formed, and pours concrete mixed by the batcher plant 20 into the formwork 24. It is to be compacted. The steam curing chamber 22 has a chamber for curing the concrete in the cast and compacted formwork 24 with high temperature steam.

Next, as described above, the segment manufacturing apparatus 6 having the above-mentioned structure installed in the tunnel 4a of the tunnel 4
Thus, the segment A to be formed is manufactured as shown by the double-dotted line B in FIG. First, the ground shaft base 9,
The component 7 is fed into the storage bin 8 through the material injection pipe 10 and the material pressure feed pipe 12 from the truck 25 or the like that has transported the component 7 constituting the concrete to the base 11, and is stocked. Then, the required amount of the constituents 7 is carried out from the storage bin 8 by the carrying device 14 and transferred to the material stocker 13.

Next, the component 7 is transferred to the belt conveyor 23.
From material stocker 13 to batcher plant 20
Then, each constituent 7 such as cement, sand, gravel, and water is weighed in a predetermined amount by an automatic measuring mechanism, and then kneaded to mix concrete. On the other hand, the rebar cage is assembled in the form 24 of the segment A to be formed and installed at a predetermined position of the batcher plant 20. Then, the mixed concrete is poured into the form 24 to be compacted, and then the surface of the concrete is finished.

Next, the mold 24 is carried into the steam curing chamber 22 and steam cured for a certain period. Next, the formed segment A is demolded from the mold 24, and the segment A is immersed in the underwater curing tank 18 to be cured in water for 2 weeks, for example. As described above, the segment A is manufactured in the downhole 4a of the tunnel 4, and the process within the chain double-dashed line B shown in FIG. 3 is performed.

On the other hand, the cutter mechanism provided in the shield machine 3 in front of the tunnel 4 shown in FIG. 1 excavates the natural ground, and the erector mechanism provided in the shield machine 3 excels the segment manufacturing facility 6 The segment A manufactured by is assembled in the excavated downhole 4a in a cylindrical shape.
Then, a reaction force is applied to the front end of the assembled segment A to extend the propulsion jack inside the shield machine 3 to propel the entire shield machine 3 forward, and by repeating these steps, the tunnel 4 is formed in the ground 1. To construct.

As described above, as described above, the supply mechanism 15 for supplying the constituent 7 constituting concrete to the underground 4a from the ground, the batcher plant 20 for mixing concrete from the constituent 7, and the concrete form 24 Placed on
Placing / compacting device 21 for compaction and placing / compacting on form 24
Since the segment manufacturing facility 6 including the steam curing chamber 22 for curing the compacted concrete and the underwater curing tank 18 is provided, the segment A can be manufactured in the downhole 4a. As a result, the components 7 need only be supplied from the ground, and the number of trucks for transportation can be greatly reduced, so that the transportation cost can be significantly reduced, and further, the unloading from the truck on the ground can be performed. The space can be reduced significantly.

Further, in the shield construction method, the segment A is manufactured by the segment manufacturing equipment 6 installed in the prefabricated downhole 4a behind the shield machine 3 which moves forward while excavating the natural ground, and the manufactured segment A is manufactured. The tunnel 4 is constructed by assembling the inside of the excavated underground 4a. Thereby, the transportation of the segment 5 from the factory and the transportation into the mine are performed only by the segments 5, 5, ... For constructing the tunnel 4 having a predetermined length for installing the segment manufacturing facility 6, for example, 100 m. Therefore, the labor for transporting and transporting the heavy segment 5 can be significantly reduced, and dangerous work can be reduced.
Work can be performed easily and safely.

Further, in addition to the vertical shaft base 9 around the above-ground opening 2a of the vertical shaft 2, a base 11 is provided on a public land near the main road.
Is provided, and the structure 7 can be pressure-fed from the base 11. Accordingly, for example, even when the site is narrow such as in the center of the city and it is difficult to secure a sufficient area for the shaft base 9, it is possible to supply the constituents 7 without trouble.

In the above embodiment, the segment manufacturing equipment 6 is installed in the tunnel 4a of the tunnel 4, but the segment manufacturing equipment 6 is configured to be movable, and the inside of the tunnel 4 is advanced as the shield machine 3 advances. May be configured to move forward. As a result, even when the tunnel 4 to be constructed has a long distance, the underground transportation distance of the segment A can be shortened as much as possible.

[0024]

As described above, according to the shield construction method of the first aspect, in the shield construction method, the segment is manufactured in the pre-built mine behind the shield machine that advances while excavating the natural ground. A tunnel is formed by assembling the manufactured segments in the excavated mine. As a result, it is possible to significantly reduce the labor for transporting and transporting the heavy load segment from the factory into the mine, and it is possible to reduce the dangerous work, so that the work can be performed easily and safely.

According to the segment manufacturing facility of the second aspect, the supply mechanism for supplying the constituents such as cement, aggregate, and water constituting the concrete from the ground into the mine, and the concrete for mixing the concrete from the constituents. A segment manufacturing facility including a manufacturing mechanism, a casting / compacting mechanism for casting / compacting concrete on the formwork, and a curing mechanism for curing the concrete cast / compacted on the formwork,
The segment can be manufactured in the downhole. As a result, the method according to claim 1 can be realized, and since the segment can be manufactured in the mine by only supplying the aggregate from the ground, the number of trucks for transportation can be significantly reduced. Therefore, the transportation cost can be significantly reduced. Furthermore, the space for unloading trucks on the ground can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a shield construction method according to the present invention and a segment manufacturing facility used for the shield construction method.

FIG. 2 is a side sectional view showing a segment manufacturing facility according to the present invention.

FIG. 3 is a process drawing showing a shield construction method according to the present invention.

[Explanation of symbols]

 4 Tunnels 6 Segment manufacturing equipment 7 Components 15 Supply mechanism 18 Underwater curing tank (curing mechanism) 20 Batcher plant (concrete manufacturing mechanism) 21 Casting / compacting device (casting / compacting mechanism) 22 Steam curing room (curing) Mechanism) 4a Underground A segment

Claims (2)

[Claims] 1. In the shield construction method, the segments are
A shield construction method characterized in that a tunnel is formed by using the manufactured segment, which is manufactured inside a pre-built mine behind a shield machine for excavating a natural ground. 2. A manufacturing facility for a segment used in a shield construction method, which comprises a supply mechanism for supplying constituents such as cement, aggregate, and water constituting concrete from the ground into a mine, and concrete from the constituent. Provide segment manufacturing equipment including a mixed concrete manufacturing mechanism, a casting / compacting mechanism for casting / compacting concrete on the formwork, and a curing mechanism for curing the concrete cast / compacted on the formwork. Segment manufacturing equipment characterized by