JPH07229391A - Shield machine and shield driving method - Google Patents

Abstract

PURPOSE:To enhance water stopping function, reduce a construction period and lower construction cost by driving a shield machine and forming a water stop zone, while the surrounding natural ground being excavated and agitated under the feed of a compaction agent. CONSTITUTION:Shield jacks 6 and 6 are expanded on reaction from a segment built behind, thereby driving a shield machine body 1. At the same time, the natural ground of a face is excavated with a cutter body 21, and excavated sediment is taken into the body 1. In this case, the natural ground surrounding the body 1, while being supplied with a compaction agent from compaction agent filling sections 3 and 3, is excavated and agitated with an expanded cutter 22 and an agitation section 4. As a result, the front natural ground of the cutter 22 flows behind via a passage window after excavated and, then, is agitated and mixed with the compaction agent. Thereafter, the agitated and mixed sediment cures in the prescribed time, thereby forming water stopping zones 7 and 7 around the body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine and a shield construction method.

[0002]

2. Description of the Related Art The shield construction method is a construction method in which a shield machine is excavated and segments are assembled behind the shield machine, but inside the assembled segments, there are two It is necessary to place the next roll concrete and to inject the backing material into the gap between the segment and the ground for stabilizing the ground.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
There are the following problems. <B> Since the secondary winding concrete is installed inside the segment, the finished cross section is smaller than the excavation diameter.

<B> Since the excavation diameter becomes unnecessarily large,
Due to an increase in segment ring diameter and an increase in excavated soil, the construction will be prolonged and the construction cost will increase.

<C> Since the backfill material is simply injected into the tail void, sufficient waterproofness cannot be obtained.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a required finished cross section can be obtained by the minimum necessary excavation, and the construction period and the construction cost can be shortened. An object of the present invention is to provide a shield machine and a shield construction method capable of improving the water stopping performance.

[0007]

That is, according to the present invention, a cutter body having a diameter substantially equal to the diameter of the shield machine body is provided at the end of the shield machine body on the excavation side, and a peripheral edge of the cutter body. Part
Equipped with a rotary cutter consisting of an expansion cutter protruding from the cross section of the shield, and this rotary cutter is provided with a solidification material injection part for injecting the solidification material into the outer peripheral ground of the shield machine body. It is a shield machine. In addition, the above
In a shield construction method using a shield machine, the rotary cutter is rotated to drive the shield machine, and
While injecting the solidifying material from the solidifying material injecting section into the outer peripheral ground of the machine body, the outer cutter is excavated and stirred by the expansion cutter, and the segment constructed behind the shield machine body is used. It is a shield construction method that constructs a waterproof zone around the outside.

[0008]

An embodiment of the present invention will be described below with reference to FIGS. <a> Structure of shield machine The structure of the shield machine is as follows:
It comprises a rotary cutter 2 equipped at the end of the excavation section and known equipment necessary for other shield machines. The rotary cutter 2 is composed of a cutter body 21 having a diameter substantially the same as the diameter of the body 1, and an expansion cutter 22 provided on the peripheral portion of the cutter body 21 so as to project from the shield cross section. The cutter body 21 is connected to the motor and is rotatable.

Further, as shown in FIG. 1, the excavation surfaces of the cutter body 21 and the expansion cutter 22 are arranged on the same plane, and as shown in FIG.
There is a case where the excavation surface is positioned closer to the tail side of the shield machine than the excavation surface of the cutter body 21. In the case of the structure shown in FIG. 2, the cutter main body 21 is formed in a tubular shape, and the expansion cutter 22 is projected from the peripheral surface 23 thereof.

Further, the rotary cutter 2 is provided with a solidifying material injecting portion 3 for injecting the solidifying material to the outer periphery of the peripheral surface of the main body 1. Each part of the shield machine will be described below.

(1) Expansion Cutter The expansion cutter 22 is provided at the peripheral edge of the cutter body 21 so as to project from the shield cross section, and a required number of windows for allowing excavated earth and sand to pass therethrough are opened. Since the earth and sand excavated by the expansion cutter 22 are not taken into the shield machine, they flow backward through this passage window and are kneaded with the solidifying material.

As a concrete example of the expansion cutter 22, a plurality of face-plate type or spoke type cutters are provided on the peripheral edge of the cutter body 21 at circumferential intervals so as to project between the cutters. A structure in which a gap is used as a passage window is conceivable. The expansion cutter 22 is an over cutter and a copy cutter.
Although a cutter or the like may be used, it is desirable that the expansion cutter 22 be fixed to the cutter body 21 because of its poor strength and durability.

(2) Solidifying Material Injecting Section The solidifying material injecting section 3 is a device for injecting a solidifying material such as cement milk into the outer peripheral ground on the peripheral surface of the main body 1. For example, the main body 1 is equipped with a solidifying material tank and an injection pump (not shown), and piping is provided between them and an injection nozzle provided on the back side of the expansion cutter 22.

(3) Stirring unit On the rear side of the expansion cutter 22, a stirring unit 4 for stirring the ground around the main body 1 that has been excavated and injected with the solidifying material is provided in a protruding manner. As the stirring unit 4, a steel plate or steel rod-shaped member is used. The position where the stirring section 4 is provided is an appropriate position on the back side of the expansion cutter 22, and for example, as shown in FIGS.

Although not shown, a plurality of expansion cutters 22 are arranged side by side from the rear end side of the expansion cutter 22 to the front end.
May be provided. Further, the tip of the stirring unit 4 on the side of the shield machine is projected to the tail side with respect to the injection tip of the solidifying material injecting unit 3, and the solidifying material is injected into the excavated sand and then stirred. It is also possible to configure so as to perform good stirring and mixing.

<B> Construction Method Hereinafter, a shield construction method using the shield machine configured as described above will be described. In the excavation of the shield machine, the shield jack 6 is extended by taking a reaction force to the segment 7 constructed in the rear to propel the main body 1 and excavate the cutting ground with the cutter main body 21 to excavate the earth and sand. It is carried out by taking it into the main body 1.

At this time, while the solidifying material is injected from the solidifying material injecting section 3 into the earth around the outer periphery of the main body 1, the expanding cutter 22 and the agitating section 4 excavate and agitate the outer surrounding earth. That is, the ground in front of the expansion cutter 22 flows backward through the passage window after being excavated, and the solidifying material is injected therein and is stirred and mixed by the stirring unit 4. The earth and sand mixed by stirring retains fluidity for a certain period of time, but solidifies after a certain period of time. Therefore, as shown in FIGS.
A water stop zone 7 can be formed around the outer periphery of the main body 1.

[0018]

Since the present invention is as described above, the following effects can be obtained. <B> In order to form a water stop zone on the outside of the segment,
Unlike the conventional case, it is not necessary to construct the secondary winding concrete inside, and the required finished cross section can be obtained by the minimum necessary excavation.

<B> Since the excavation diameter can be reduced by the amount of the conventional secondary winding concrete, the segment ring diameter can be minimized and the amount of excavated soil can be reduced. Can be shortened and the construction cost can be reduced.

<C> Since the waterproof zone having a sufficient thickness is formed around the outer circumference of the segment, the waterproofness can be improved.

<D> Since the water-stop zone keeps sufficient fluidity until it solidifies, the conventional back-filling of tail voids becomes unnecessary, and the construction can be simplified.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of a shield machine of the present invention.

FIG. 2 is an explanatory diagram of an embodiment of the shield machine of the present invention.

Claims (13)

[Claims] 1. A cutter body having substantially the same diameter as the diameter of the shield machine body at the end of the shield machine body on the excavation side, and a peripheral edge portion of the cutter body protruding from the shield cross section. The shield machine is equipped with a rotary cutter consisting of the expansion cutter provided, and the rotary cutter is provided with a solidification material injection section for injecting the solidification material into the outer peripheral ground of the shield machine body. . 2. The shield machine according to claim 1, wherein:
A shield machine in which the excavation surfaces of the cutter body and the expansion cutter are located on the same plane. 3. The shield machine according to claim 1, wherein:
A shield machine in which the excavation surface of the expansion cutter is located closer to the tail side of the shield machine than the excavation surface of the cutter body. 4. The seam according to claim 1.
In the shield machine, the expansion cutter is provided with a passage window for excavated earth and sand. 5. The seam according to claim 1.
A shield machine in which the expansion cutter is fixed to the cutter body. 6. The seam according to claim 1.
In the cold machine, the expansion cutter is configured as a face plate type,
Shield machine. 7. The seam according to claim 1.
A shield machine in which the expansion cutter is of a spoke type. 8. The seam according to claim 1.
A shield machine, wherein the solidifying material injection portion is provided on the back side of the expansion cutter. 9. The seam according to claim 1.
In the shield machine, the shield machine is formed by projecting a stirring section for stirring the ground around the shield machine on the back side of the expansion cutter. 10. The shield machine according to claim 9, wherein the agitating portion is provided so as to project from a front end portion on the back surface side of the expansion cutter. 11. The shield machine according to claim 9 or 10, wherein a plurality of the stirring portions are arranged side by side from a rear end side of the expansion cutter to a front end portion thereof. 12. The shield machine according to any one of claims 9 to 11, wherein a tip end of the agitating portion on the side of the shield machine tail is located closer to an end than an injection tip of the solidifying material injecting portion. Tee
A shield machine that is configured to project to the rule side. 13. A shield construction method using the shield machine according to claim 1, wherein the rotary cutter is rotated to advance the shield machine and the shield machine. While injecting the solidifying material into the solid surroundings of the main body from the solidifying material injection part, the outer peripheral ground is excavated and stirred by the expansion cutter, and the outer periphery of the segment constructed behind the shield machine main body A shield construction method to construct a water-stop zone on the ground.