JPH116387A - Two-stage shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the term of work by conducting rearrangement work from the excavation of a large diametral tunnel to the excavation of a small diametral tunnel in a short time by connecting the main body of a small shield machine to a large shield machine by a transmission member detachably coupled with the main body of the small shield machine. SOLUTION: A small shield segment Sb transmitting thrust and torque at the time of uniting and excavation is installed between the ring girder 13 of a large shield machine Ma and a small shield machine body Lb. The small shield segment Sb and the small shield machine body Lb are connected detachably, and rearrangement work from the excavation of a large diametral tunnel Ta to the excavation of a small diametral tunnel Tb is conducted in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage shield machine capable of continuously excavating a ground from a large-diameter tunnel to a small-diameter tunnel. The present invention relates to a two-stage shield excavator that facilitates the changeover work from excavation to small diameter tunnel excavation.

[0002]

2. Description of the Related Art Conventionally, a shield excavator has been used as a means for forming a tunnel (transverse tunnel) underground, and in recent years, sewage, electricity, telephone lines and the like in urban maintenance and the like are buried in recent years. Tunnel construction is increasing rapidly. As such tunnel construction, there are many demands for forming a small-diameter so-called branch pipe on the upstream side and forming a large-diameter so-called main pipe on the downstream side as in, for example, sewerage work. In the case of forming such a tunnel, a stand is provided at a junction point having a different tunnel diameter, and from this stand, each tunnel is excavated by a different shield excavator having a different diameter and connected at the stand position. However, providing a shaft at each junction requires a lot of cost and time. Moreover, in some cases, a stand cannot be provided in an urban area. In this case, since all the two tunnels having different diameters have a large diameter, a large amount of cost is required.

[0003] Therefore, a two-stage shield machine which does not require a shaft at the junction has been developed. The prior art of this two-stage shield machine is disclosed in Japanese Unexamined Patent Publication No.
Although there is an invention described in Japanese Patent Application Publication, there is an invention in which a small shield excavator is provided in a large shield excavator, and these shield excavators are integrally connected by knocking to excavate a large-diameter tunnel. By removing the knock and releasing the connection, a small-diameter tunnel can be excavated by the small shield machine (conventional example 1).

[0004] Another prior art is disclosed in Japanese Patent Laid-Open No. 1-9 / 1990.
There is an invention described in Japanese Patent No. 4193 and an invention described in Japanese Patent Application Laid-Open No. 3-66897. In these inventions, a large shield excavator having a function as a shield excavator and a small shield excavator are combined to form a two-stage shield. An excavator is configured so that a small-diameter tunnel can be excavated from a predetermined position with a small shield excavator (conventional example 2).

[0005]

However, in the above-mentioned prior art 1, in order to transmit a large torque by a knock connecting the two shield excavators, the structure becomes complicated and the manufacturing time and cost of the shield excavator increase. In addition, when branching a small-diameter tunnel from a large-diameter tunnel, a large amount of time is required for a setup change operation such as removal of an erector for a large-diameter tunnel, and efficient work cannot be performed.

Further, in the case of the above-mentioned conventional example 2, since a structure for driving the cutter head is also provided in the large shield excavator, a large diameter difference is required between the large shield excavator and the small shield excavator. As a result, it is impossible to excavate a two-stage tunnel with a small diameter difference.

[0007]

In order to solve the above-mentioned problems, the invention according to the present application provides a thrust and torque between a ring gutter of a large shield excavator and a main body of a small shield excavator at the time of united excavation. A transmission member having substantially the same diameter as the small shield segment for transmitting the power is provided, and the transmission member is detachably connected to the main body of the small shield machine.

[0008] By thus connecting the large shield excavator with the transmission member detachably connected to the main body of the small shield excavator, the setup change operation from excavation of the large diameter tunnel to excavation of the small diameter tunnel can be performed in a short time. Since it can be performed, the construction period can be shortened.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The invention according to this application relates to a two-stage shield excavator in which a small shield excavator is concentrically arranged in a main body of a large shield excavator. A drive device for driving the large cutter disk is provided, and the thrust and torque are transmitted between the ring shield of the large shield machine and the main body of the small shield machine when the large shield machine and the small shield machine are united. A transmission member having substantially the same diameter as the small shield segment is provided, and this transmission member is detachably connected to the main body of the small shield machine.

As described above, the connection between the large shield excavator and the small shield excavator is performed by the transmission member provided between the ring gutter of the large shield excavator and the main body of the small shield excavator. Can be easily changed to a small shield machine.

If a space for one ring of the small shield segment is provided between the transmission member and the ring gutter of the small shield excavator, the transmission member and the small shield excavator can be used during a setup change operation from a large-diameter tunnel to a small-diameter tunnel. The main body can be easily separated.

If a detachable connecting member is provided between the transmission member and the main body of the small shield machine, the transmission member and the small shield machine can be easily attached and detached.

Furthermore, the erector drum of the large shield machine is detachably provided, and the erector drum is formed in a size that can be used as the erector drum of the small shield machine, and is transferred from the large shield machine to the small shield machine. By making it possible, the segment construction for the large-diameter tunnel and the segment construction for the small-diameter tunnel can be performed by one erector.

Further, a fixing device is provided on the small cutter disk of the small shield machine for coupling or detaching from the large cutter disk of the large shield machine, and the large cutter disk and the large shield machine body are separated when the fixing device is released. If the fixing member for fixing is provided in the large shield machine, the large cutter disc can be stably held when the small shield machine is branched from the large shield machine.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention according to the present application will be described below with reference to the drawings.

FIG. 1 is a side sectional view of a two-stage shield machine showing one embodiment of the invention according to the present application, and FIG. 2 is a front view of the two-stage shield machine.

As shown in the figure, a small shield excavator Mb is provided in a large shield excavator Ma to constitute a two-stage shield excavator N. The cutter disk side of the erector E of the large shield excavator Ma ( A small shield machine Mb is disposed at the front.

The large cutter disc Da provided at the front of the large shield machine Ma and the small cutter disk Db provided at the front of the small shield machine Mb connect or disconnect these cutter disks Da and Db. The cutter disk D as the two-stage shield excavator N is formed by fixing with the fixing device F to be made.

A driving device for driving the cutter disk D is provided in the small shield machine Mb, and a center shaft 1 for driving the cutter disk D is provided.
The cutter disk D is turned by driving the drive gear 3 meshing with the driven gear 2 provided on the drive gear 4 by the drive motor 4. Reference numeral 5 denotes a bearing that rotatably supports the center shaft 1.

The small shield machine Mb of this embodiment
Has a center bending mechanism U, and a small shield machine L
The center-bending jack 8 provided between the front trunk 6 and the rear trunk 7 of FIG. Whether or not the small shield machine Mb has the center bending mechanism U may be appropriately determined according to conditions such as a tunnel forming place. Since the folding mechanism U is provided, the rolling stopper 9 is provided between the front trunk 6 and the rear trunk 7. Further, in this embodiment, an erector wheel 11 is provided at a rear portion of a ring garter 10 which is provided at a rear end of the center bending jack 8 in advance.

On the other hand, a large shield jack 14 is provided on a rear ring girder 13 provided on the main body La of the large shield machine Ma.
4 is configured to take a digging reaction force on the segment Sa of the large diameter tunnel Ta. Reference numeral 15 denotes a tail seal. The rear ring gutter 13 is provided with wheels 16 for the erector, and the erector drum Ea of the erector E is provided along the wheels 16 so as to be able to turn. Reference numeral 12 denotes a reinforcing member which is in contact with the rear trunk 7 of the small shield machine Lb and concentrically holds the small shield machine Mb. Reference numeral 17 denotes a drive motor for turning the erector E.

Between the rear ring garter 13 and the small shield machine Mb, one small shield segment Sb as a transmission member is assembled. The small shield segment Sb is fixed with its rear end in contact with the rear ring garter 13 and its front end in contact with a connecting member 18 provided on the rear trunk 7 of the small shield machine Mb. In this embodiment, a small shield segment Sb is used as a transmission member.
However, any member may be used as long as it has substantially the same diameter as the small shield segment Sb and can transmit the thrust and the torque during the combined propulsion.

As described above, the excavation reaction force is transmitted by the small shield segment Sb incorporated in advance between the large shield excavator Ma and the small shield excavator Mb, and as described later, the excavation of the large diameter tunnel Ta is reduced to a small diameter. The setup change operation when branching to the excavation of the tunnel Tb can be easily performed.

An erector drum moving rail 20 is provided between the ring garter 19 and the rear ring garter 13 under the small shield excavator Mb so that the erector E can be easily rearranged.

A tail seal 21 is provided at the rear end of the rear body 7 in contact with the small shield segment Sb, and is provided between the small shield excavator Mb and the small shield excavator Mb in front of the large shield excavator Ma when excavating a large diameter tunnel. Seal member 2 for preventing earth and sand from entering
2 are provided.

Further, a fixing device F for fixing the large cutter disk Da and the small cutter disk Db includes a jack 23 provided in the small cutter disk Db and a fixing portion 24 of the large cutter disk Da due to expansion and contraction of the jack 23. And a fixing member 25 fitted or detached. A fixing jack 2 serving as a fixing member for fixing the large cutter disk Da and the large shield machine main body La to the front of the large shield machine Ma.
6, and a plurality of locking members 27 provided on the rear circumference of the large cutter disc Da are fixed in a state where they are aligned with the positions of locking pieces 28 provided at the front end of the large shield machine body La. By extending the jack 26, the locking piece 28 is locked and fixed at the end of the locking member 27. G is a copy cutter provided in the small cutter disk Db.

The small shield machine Mb is provided with a screw conveyor B for discharging earth and sand in the cutter chamber C. In this embodiment, an earth pressure shield is described as an example, but a muddy shield may be used.

FIGS. 3 to 9 show the two-stage shield excavator N described above.
FIG. 3 is a side sectional view showing a state before branching of the two-stage shield machine shown in FIG. 1, and FIG. FIG. 5 is a sectional view of the same side showing the following procedure of FIG. 4, FIG. 6 is an enlarged sectional view of the tip of the same two-stage shield machine shown in the following procedure of FIG. 5, FIG. FIG. 8 is an enlarged sectional view showing the next procedure of FIG. 6, FIG. 8 is a drawing of a two-stage shield machine showing the next procedure of FIG. 7, and a side sectional view showing a branched state of the small shield machine, and FIG. FIG. 4 is a side sectional view showing a tunnel formed by a two-stage shield machine in the drawing showing the next point.

As shown in FIG. 3, the large shield machine Ma
Excavating the large diameter tunnel Ta to a predetermined position,
As shown in FIG. 4, some of the plurality of large shield jacks 14 provided on the circumference are reduced and removed, and a reaction force rib R is welded to the large shield machine body La by assembling the segments Sa. Fix by the means. This reaction force rib R may be any as long as it can fix the large shield machine Ma at a predetermined position, and locks the front surface of the segment Sa to act on the front surface of the large cutter disc Da of the large shield machine Ma. It is only necessary to stop the force in the backward direction caused by the force. Further, the locking by the reaction force rib R is performed by sequentially removing the large shield jack 14 at a predetermined position provided on the circumference and sequentially attaching the large shield jack 14 to the main body La while assembling the segments Sa, and finally providing the entire circumference. Can be Small shield machine Mb in this state
Of the large shield excavator Mb is transmitted from the rear body 7 of the small shield excavator Mb to the ring gutter 13 of the large shield excavator Ma via the connecting member 18 and the small shield segment Sb. It is received by the large shield segment Sa via a reaction force rib R provided on La.

In this embodiment, since the small shield jacking machine Mb is not provided with the small shield jack in advance, the large shield jack 1 removed from the large shield machine Ma is not provided.
4 shows an example in which the small shield jack 14 is incorporated into the small shield machine Mb and reused as the small shield jack 14 (with the same reference numeral).

In order to receive the excavation reaction force of the small shield machine Mb by the small shield jack 14, first, several of the connecting members 18 (see FIG. 3) provided on the circumference are removed, and Small shield jack 1 provided at position
4 is extended and stretched to the small shield segment Sb. Thereafter, the connection member 18 provided on the other circumference is removed, and the small shield segment Sb is stretched by the small shield jack 14. The connection member 18 on the entire circumference is removed, and the small shield segment Sb is stretched by the small shield jack 14. Large shield jack 1 if stretched
The reaction force can be changed from 4 to the small shield jack 14.

Then, as shown in FIG. 5, the erector E provided on the large shield machine Ma is removed, and the small shield machine M is used by using the moving rail 20 (see FIG. 3).
b to a predetermined position, and is attached to the wheels 11 provided in advance in the small shield machine Mb. The small shield segment S provided in advance by the erector E of the small shield machine Mb provided in this way.
A segment Sb for one ring is assembled at the front of b.

Next, as shown in FIG. 6 and FIG. 7, the large cutter disc D
a and the small cutter disc Db are disconnected so that the small shield machine Mb can branch. This division first stops the large cutter disc Da, which is fixed to the small cutter disc Db and rotates integrally, at a predetermined position, as shown in FIG. The predetermined position is such that the locking member 27 provided on the back surface of the large cutter disc Da is
6 is a position opposed to 6.

Then, as shown in FIG.
The fixing member 25 is removed from the large cutter disk Da and stored in the small cutter disk Db, and the fixing jack 26 is extended to lock and lock the locking piece 28 at the end of the locking member 27. . By this operation, large cutter disk D
a and the small cutter disk Db are separated from each other so that the small shield excavator Mb alone can excavate independently.

Then, as shown in FIG. 8, the rear ring garter 13 is reinforced to form a reaction force receiver 29, and the small shield jacking machine Mb is excavated by the small shield jack 14, and the small shield segment is The small diameter tunnel Tb is excavated while assembling Sb. The excavation reaction force at this time is transmitted from the small shield segment Sb to the large shield segment Sa via the rear ring gutter 13 and the large shield machine Mb, and is supported. The tunnel excavated in this manner is a large-diameter tunnel Ta as shown in FIG.
And a continuous small-diameter tunnel Tb can be formed.

As described above, the excavation reaction force during excavation by the large shield excavator Ma is transmitted from the connecting member 18 provided on the small shield excavator Mb via the small shield segment Sb (transmission member) to the large shield excavation. The shield body La, Lb is not provided with a device for transmitting to the shield machine Ma, so that it is easy to switch from the large shield excavator Ma to the small shield excavator Mb, and the working time is greatly reduced. It becomes possible and labor can be reduced.

In this embodiment, the small shield machine Mb having the center folding mechanism U has been described as an example. However, both the large shield machine Ma and the small shield machine Mb may have the center folding mechanism U. It may not be necessary, and may be determined according to the excavation conditions.

In the above embodiment, the large shield jack 14 provided in the large shield machine Ma is diverted to the small shield machine Mb. However, the small shield jack is previously converted to the small shield machine Mb. And the present invention is not limited to the above embodiment.

[0039]

The invention according to this application is implemented in the form described above, and has the following effects.

A transmission member for transmitting thrust and torque during merged excavation is provided between the ring gutter of the large shield excavator and the main body of the small shield excavator, and this transmission member and the main body of the small shield excavator are detachable. By connecting to
Since the changeover work from the large shield excavator to the small shield excavator can be easily performed, it is possible to greatly reduce the construction period and the construction cost.

Further, if a space for one ring is provided between the transmission member and the ring gutter of the small shield excavator, the transmission member and the small shield excavator can be used during a setup change operation from a large-diameter tunnel to a small-diameter tunnel. Since the main body can be easily separated from the main body, the work of installing the small shield segment can be easily performed.

Furthermore, if a detachable connecting member is provided between the transmission member and the small shield machine, the attachment and detachment of the transmission member and the small shield machine can be facilitated, and the workability can be further improved. It becomes possible.

Further, the erector drum of the large shield machine can be used also as the erector drum of the small shield machine, so that the segment construction for the large-diameter tunnel and the segment construction for the small-diameter tunnel are performed by one erector E. This makes it possible to effectively use the space in the shield machine as well as to reduce the equipment cost.

Further, a fixing device for connecting or detaching the large cutter disk to or from the large cutter disk is provided on the small cutter disk, and a fixing member for fixing the large cutter disk and the large shield excavator body to the large shield excavator in the detached state of the fixing device. If it is provided, the large cutter disc can be stably held when branching the small shield machine from the large shield machine, so the branch from large diameter tunnel excavation to small diameter tunnel excavation can be performed stably Becomes

[Brief description of the drawings]

FIG. 1 is a side sectional view of a two-stage shield machine showing one embodiment of the invention according to the present application.

FIG. 2 is a front view of the two-stage shield machine shown in FIG. 1;

FIG. 3 is a side sectional view showing a state before branching of the two-stage shield machine shown in FIG. 1;

FIG. 4 is a side sectional view of the two-stage shield machine shown in a manner following FIG. 3;

FIG. 5 is a side sectional view of the two-stage shield excavator showing a point following FIG. 4;

6 is an enlarged cross-sectional view of a tip portion of a two-stage shield machine showing a procedure following FIG. 5;

FIG. 7 is an enlarged sectional view of the tip of the two-stage shield machine shown in the following point of FIG. 6;

8 is a side sectional view showing a branch state of the small shield machine in the drawing of the two-stage shield machine in the next point of FIG. 7;

FIG. 9 is a side sectional view showing a tunnel formed by a two-stage shield excavator, showing a procedure following FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Center shaft 2 ... Driving gear 3 ... Driving gear 4 ... Driving motor 5 ... Bearing 6 ... Front trunk 7 ... Rear trunk 8 ... Center bending jack 9 ... Rolling stopper 10 ... Ring garter 11 ... Wheel 12 ... Reinforcement 13 ... Rear part Ring garter 14 ... Large shield jack 15 ... Tail seal 16 ... Wheel 17 ... Drive motor 18 ... Connecting member 19 ... Ring garter 20 ... Electrum drum moving rail 21 ... Tail seal 22 ... Seal member 23 ... Jack 24 ... Fixed part 25 ... Fixing material 26 ... Fixing jack 27 ... Locking member 28 ... Locking piece 29 ... Reaction force receiving B ... Screw conveyor C ... Chamber E ... Elector Ea ... Electrum drum F ... Fixing device G ... Copy cutter R ... Reaction force rib Da ... Large cutter disk Db ... Small cutter disk La ... Large shield machine Lb ... small shield machine main body Sa ... large shield segments Sb ... small shield segments Ta ... large diameter tunnel Tb ... small diameter tunnel Ma ... large shield machine Mb ... small shield machine N ... two-stage shield machine

Claims (5)

[Claims] 1. A two-stage shield machine having a small shield machine in a main body of a large shield machine, wherein the large shield machine and the small shield machine are arranged concentrically. A drive device for driving the small cutter disk and the large cutter disk is provided in the excavator, and between the ring gutter of the large shield excavator and the main body of the small shield excavator, the large shield excavator and the small shield excavator are connected. A two-stage shield excavator characterized in that a transmission member having substantially the same diameter as a small shield segment that transmits thrust and torque during coalescing excavation is provided, and the transmission member and the main body of the small shield excavator are detachably connected. . 2. The two-stage shield machine according to claim 1, wherein a space for one ring of the small shield segment is provided between the transmission member and the ring gutter of the small shield machine. 3. The two-stage shield machine according to claim 1, further comprising a detachable connection member provided between the transmission member and the main body of the small shield machine. 4. An erector drum of a large shield machine is detachably provided, and the erector drum is formed in a size that can be used as an erector drum of a small shield machine, and is transferred from the large shield machine to the small shield machine. The two-stage shield machine according to any one of claims 1 to 3, wherein the machine is enabled. 5. The small cutter disc of the small shield machine is provided with a fixing device for coupling to or detaching from the large cutter disk of the large shield machine, and the large cutter disc and the large shield machine body are separated when the fixing device is released. The two-stage shield machine according to any one of claims 1 to 4, wherein a fixing member to be fixed is provided on the large shield machine.