JPH1136778A - Underground connection type shield machine and underground connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve the problems of danger and heavy workload due to the need for costly and time-consuming ground improvement, excavation of surplus soil and gas cutting of the sides (segments) of the shaft walls of a tunnel by workers in a conventional construction method by which the front end portion of a shield machine is joined to the side of an existing tunnel because a technique to join two shield machines perpendicularly underground has never been reported. SOLUTION: A concrete closed portion 10 is provided in a part of the body member 60 of the first shield machine 1A, and the front end portion of the body member 60 is penetrated into the first shield machine 1A from an opening 15 and joined while forming the opening 15 by excavating the closed portion 10 by the cutter disk 61 of the second shield machine 1B. When the first and second shield machines 1A, 1B are to be joined, a flow of water into the first shield machine 1A from the opening 15 is controlled by a sealed portion 20 and a cut-off mechanism 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground shield type excavator and a method of joining the same underground, and more particularly, to joining a front end of a second shield excavator to a side surface of a first shield excavator in an orthogonal manner. Related to technology.

[0002]

2. Description of the Related Art Conventionally, when a tunnel for water supply and sewerage, a common ditch, and the like are constructed orthogonally by a shield method using a shield excavator, a shaft for carrying the shield excavator is provided at the orthogonal portion. It is a general construction method to join two tunnels at right angles by using the method. By the way, in the case of a tunnel formed underground in an urban area, it is often impossible to form a shaft because structures are congested both underground and underground. Therefore, a construction method has been put into practical use in which a shield excavator is excavated toward a side surface of an existing tunnel, and a front end of the shield excavator is joined to a side surface of the existing tunnel, and the tunnel is constructed in an orthogonal shape. Kaihei 2-12049
No. 7).

In the underground tunnel joining method disclosed in Japanese Patent Application Laid-Open No. 2-120497, a shield machine is slidably fitted on a body member, and a front end face of the machine comes into contact with a side surface of a tunnel wall from outside the existing tunnel. It has a protection cylinder that can be contacted, and a plurality of hydraulic jacks that push and drive the protection cylinder. During the excavation of the shield machine, the protection cylinder is kept behind the cutter disk that excavates the ground, and when the cutter disk approaches the side of the tunnel wall of the existing tunnel, excavation is stopped, and the protection cylinder is hydraulically jacked. The extruder is driven to bring its front end face into contact with the outer surface of the wellhead wall.

[0004] Next, the ground around the junction of the tunnel is ground-improved by injecting a ground hardening agent, and the ground collapses, sinks, or invades groundwater or soil from the ground into the protection cylinder. After that, the worker goes out of the chamber into the protection cylinder on the front side, excavates the remaining earth and sand up to the existing tunnel in the protection cylinder, transports it to the screw conveyor and removes it, and removes the soil from the existing tunnel. The side of the wall (segment) is cut by gas fusing etc. to form an opening,
Joins two orthogonal tunnels.

[0005] On the other hand, in addition to the restrictions on the construction site of the shaft, the construction period is limited, and the distance that can be excavated by one shield excavator is also limited. A technique has been put to practical use in which the excavators share and excavate in the direction of approaching each other, and the front ends of two shield excavators are joined underground (Japanese Patent Laid-Open No. 4-55594).
Reference). However, due to the structure of the shield machine, a technique for joining two shield machines in the ground at right angles has not been proposed yet and has not been put to practical use.

[0006]

Problems to be Solved by the Invention
In the underground tunnel joining method disclosed in Japanese Patent No. 0497, the shield excavator must be provided with a protective cylinder and a plurality of hydraulic jacks for pushing and driving the protective cylinder, so that the structure of the shield excavator is complicated and the manufacturing cost is high. become. In addition, since the ground around the junction of the tunnel is improved, a great deal of cost and time are required for the ground improvement work. Furthermore, since the worker must remove the remaining earth and sand in the protective cylinder and cut the side surface (segment) of the tunnel wall by gas fusing or the like to form an opening, the risk is high and the work load is high. There is a problem of being large.

An object of the present invention is to provide an underground joint type shield excavator which is excellent in economy and safety, reduces a work load, and can shorten a construction period, and an underground joining method thereof.

[0008]

According to a first aspect of the present invention, there is provided an underground shield type shield machine comprising first and second shield machines.
An underground joint type shield excavator in which a front end of a second shield excavator is joined to a side surface of a first shield excavator at right angles in the ground, wherein a torso member of the first shield excavator is provided. A part made of a concrete material that can be excavated with the cutter disk is provided in a part to penetrate the second shield excavator, and the sealing part is excavated with the cutter disk of the second shield excavator to form an opening. The front end of the body member of the second shield machine is penetrated into the first shield machine through the opening and is joined.

The sealing portion can be excavated with a cutter disk of a second shield machine, and has a strength capable of withstanding the soil pressure from the ground, for example, a plain concrete material (carbon fiber or glass fiber mixed). (Referred to as Nomust material). To penetrate the front end of the body member of the second shield machine into the first shield machine,
Preferably, the first shield machine is configured to have a larger diameter than the second shield machine. Further, it is desirable to join the first and second shield excavators while aligning the height positions of their axes. However, it is preferable to join the first and second shield excavators with their tops or bottoms aligned. Is also possible.

After stopping the first shield excavator at a joint position that can be joined to the second shield excavator, the second shield excavator is dug orthogonally toward the sealing portion of the first shield excavator, With the cutter disk excavating the sealing portion to form an opening, the front end of the body member of the second shield machine is penetrated into the first shield machine through the opening and joined. Since the front end of the trunk member of the second shield machine is penetrated into the first shield machine, it is not necessary for an operator to go outside the shield machine and work, and also, from the opening, into the first shield machine. It is possible to easily take water stoppage measures to prevent inflow of water,
There is no need to improve the ground around the junction of the shield machine.

According to a second aspect of the present invention, there is provided an underground shield type shield machine.
In the invention of claim 1, the first shield excavator has a larger diameter than the second shield excavator. Therefore, the front end of the trunk member of the second shield machine can be reliably penetrated into the first shield machine. Other operations are the same as those of the first aspect.

According to a third aspect of the present invention, there is provided an underground junction type shield machine.
In the invention of claim 2, when joining the first shield excavator and the second shield excavator, the sealing part seals an inner part of the sealing part, and is a disk cutter of the second shield excavator. An excavable sealing portion is provided in the first shield machine. With the cutter disk of the second shield machine, the front end of the trunk member of the second shield machine is excavated in the middle of the seal after excavating and penetrating the seal part of the first shield machine. Penetrate into the first shield machine. Therefore, the inflow of water into the first shield machine from the opening formed in the closing portion by the sealing portion remaining without excavation can be reliably prevented. Other effects are the same as those of the second aspect.

According to a fourth aspect of the present invention, there is provided an underground junction type shield machine.
The invention according to claim 3 is characterized in that the sealing portion is made of a filler that is solidified by filling in a casing that seals an inner surface side of the sealing portion. Therefore, when joining the first shield excavator and the second shield excavator, it is possible to easily provide a sealing portion for sealing an inner portion of the sealing portion. The casing is supported by the inner surface of the trunk member facing the sealing portion via a plurality of support members and the like, so that the load when the sealing portion of the first shield excavator is excavated by the second shield excavator can be supported. It is desirable to do. Other effects are the same as those of the third aspect.

According to a fifth aspect of the present invention, there is provided an underground junction type shield machine.
The invention according to any one of claims 1 to 4, wherein water flows into the first shield machine from an opening formed in the sealing portion on an outer peripheral portion of a front end portion of a trunk member of the second shield machine. A water stopping means for preventing the occurrence of water. After the front end of the body member of the second shield machine has penetrated into the inside of the first shield machine, water is prevented from flowing into the first shield machine from the opening by the water stopping means, and the casing is sealed. Parts can be dismantled and removed. In addition, the same operation as any one of the first to fourth aspects is achieved.

According to a sixth aspect of the present invention, there is provided an underground joining method for an underground junction type shield excavator, wherein the front end of the second shield excavator is orthogonally joined to the side surface of the first shield excavator in the ground. A method of joining a shield-type machine, wherein a sealing part made of a concrete material excavable by a second shield machine is formed in advance in order to penetrate a second shield machine into a side surface of the first shield machine. A method of excavating a blockage with the second shield excavator, and projecting a front end of the second shield excavator into a body member of the first shield excavator to join the first and second shield excavators underground. It is.

In order to allow the second shield excavator to penetrate into the side surface of the first shield excavator, a sealing portion made of a concrete material excavable by the second shield excavator is formed in advance, and this sealing portion is formed by the second shield excavation. The first and second shield excavators can be joined underground by excavating the blockade with the machine and causing the front end of the second shield excavator to protrude into the body member of the first shield excavator. Since the front end of the trunk member of the second shield machine is penetrated into the first shield machine, it is not necessary for an operator to go outside the shield machine and work, and also, from the opening, into the first shield machine. Since it is possible to easily take a water stoppage measure for preventing the inflow of water, it is not necessary to improve the ground around the joint of the first and second shield machine.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The underground shield type excavator includes a first shield excavator and a second shield excavator having a smaller diameter than the first shield excavator. First, the first shield excavator 1A will be described, but the first shield excavator 1A will be described with its excavation direction set to the front and left and right toward the front.

As shown in FIGS. 1 to 3, a first shield machine 1A has a cylindrical body member 2 and a cutter disk having a diameter substantially equal to that of the body member 2 rotatably supported by a front end of the body member 2. 3, a plurality of (for example, six) cutter driving hydraulic motors 4 for rotationally driving the cutter disk 3, and a plurality of (for example, 18) for advancing the cutter disk 3 together with the body member 2.
And a screw jack 6 for transporting the excavated soil in the chamber 34 excavated by the cutter disc 3 to the rear, and an erector for lining the segment 9 on the inner surface of the excavated tunnel Ta. 7 and
It has a tail seal 8 and the like provided at the rear end of the body member 2.

The body member 2 will be described. A cutter disk 61 of the second shield excavator 1B is provided at the center of the right side surface of the body member 2 in order to penetrate the second shield excavator 1B.
(See FIG. 4), a sealing portion 10 capable of being excavated is provided. The sealing portion 10 is made of, for example, a straight concrete material (commonly referred to as a nomust material) mixed with carbon fiber or glass fiber, has a circular shape slightly larger in diameter than the second shield excavator 1B in side view, and has a body member. About 1 of 2 diameter
/ 10, and has a strength that can withstand the soil pressure from the ground.

The closing portion 10 is hermetically fitted in an opening 2 a formed in the body member 2, and its outer peripheral portion is received and fixed by a support plate 12 fixed to the body member 2. Most of the inner peripheral surface of the sealing portion 10 directly faces the inside of the body member 2,
The cutter disk 61 of the second shield machine 1B can excavate and penetrate the sealing portion 10. Inside the closing portion 10, an insertion hole 11 is formed in the front-rear direction through which a plurality (for example, four) of hydraulic jacks 5 are inserted.

As shown in FIG. 7, the first shield machine 1
When joining A to the second shield machine 1B, after removing the components in the body member 2, a sealing portion 20 for sealing the inner portion of the sealing portion 10 is provided. The sealing portion 20 can be excavated by the disk cutter 61 of the second shield excavator 1B, and the cutter disk 61 of the second shield excavator 1B can be excavated.
Excavates and penetrates the sealing portion 10, the first shield machine 1 </ b> A passes through the opening 15 formed by excavating the sealing portion 10.
This is for preventing inflow of water into the inside, and is made up of a filler 22 which is filled into a casing 21 which seals the inner surface side of the sealing portion 10 and solidified. Even if the front end of the body member 60 of the second shield excavator 1B penetrates into the inside of the first shield excavator 1A, the sealing portion 20 is provided with the cutter disc 61.
Is formed so as not to penetrate.

In the vicinity of the inside of the front part of the body member 2, a sealing part 1 is provided.
In a portion other than 0, the partial cylindrical inner trunk 30 is
And a pair of front and rear ring web members 3 fixed to the inner surface of the body member 2.
1, 32. Front ring web material 31
A partition 33 is fixedly provided on the front side of the partition 33.
A chamber 34 is formed between the cutting disk 3 and the cutter disk 3.

The cutter disk 3 has a disk-shaped central frame 40, a plurality of cutter spokes 41 extending radially outward from the central frame 40, and an outer peripheral ring 42 connecting outer peripheral ends of the plurality of cutter spokes 41. And the central frame 40 has a fish tail cutter 4
3 are attached, and a plurality of cutter bits 44 are attached to each cutter spoke 41. A hydraulic cylinder 45 and a copy cutter 46 that can be driven in the radial direction by the hydraulic cylinder 45 are provided at the outer end of the one or more cutter spokes 41. Although not shown, a stirring rod is provided on the back surface of the cutter disk 3.

An annular frame 50 integral with the cutter disk 3 is fixed concentrically to the back surface of the cutter disk 3 near the inner surface of the front end portion of the body member 2, and the inner peripheral surface of the rear end portion of the annular frame 50. Is rotatably supported via a bearing on an annular support portion 51 fixed to the partition wall 33,
The outer peripheral surface of the rear end portion of the annular frame 50 is rotatably supported via a bearing on a bearing receiving cylinder 52 fixedly provided on the inner surface of the body member 2. A rotating shaft 53 extending forward is rotatably supported at the center of the partition wall 33, and the tip of the rotating shaft 53 is connected to the central frame 40 of the cutter disk 3. At the rear of the rotating shaft 53, there is provided a swivel joint 54 of a supply system for supplying a mudifying agent or the like to the nozzle of the cutter disk 3.

An annular member 55 having a ring gear 55a formed on its inner periphery is fixed to the rear end of the annular frame 50. The ring gear 55a is fixed to an output shaft of a plurality of cutter driving hydraulic motors 4. Are engaged with each other. The plurality of cutter drive hydraulic motors 4 are fixedly provided on the ring web member 31, and are drive-controlled synchronously by a drive control mechanism (not shown) including a hydraulic supply source, via the annular member 55 and the annular frame 50. The cutter disk 3 is driven forward and reverse. The annular member 55
The rear end face is in sliding contact with an annular bearing metal fixed to the ring web member 31.

A ring web member 35 is fixed to the inner peripheral surface of the rear part of the body member 2, and a plurality of shield jacks 5 are arranged at equal intervals in the circumferential direction between the ring web member 35 and the front ring web member 32. The shield jack 5 is fixed horizontally to the pair of ring web members 32 and 35 at both front and rear ends of the cylinder body. On the other hand, the rear end of the cylinder body of the shield jack 5 that is inserted through the insertion hole 11 of the sealing portion 10 is a ring web material 3.
5, a pipe member 36 extending forward is connected to the front end of the cylinder body, and the front end of the pipe member 36 is fixed to the ring web member 31.

The distal end of the piston rod of each shield jack 5 is connected to an eccentric metal fitting 5a having a convex spherical seat eccentric from its axis. The convex spherical seat of each eccentric metallic fitting 5a is connected to the concave spherical seat of each spreader 5b. Engagement is performed by connecting the pins, and each spreader 5b is pressed against the segment 9 covering the inner surface of the tunnel Ta to take a reaction force of the excavation, so that the plurality of shield jacks 5 excavate while generating propulsion force. Has become. In addition, the erector 7 is an erector frame 7
a and an elector body 7b.

Next, the second shield machine 1B will be described. The second shield excavator 1B will be described with the excavation direction as the front and the left and right toward the front as left and right. However, since the structure is substantially the same as that of the first shield machine 1A, a detailed description of the same structure will be omitted, and the structure will be simply described.

As shown in FIG. 4, the second shield machine 1
B is a cylindrical body member 60, a cutter disk 61 rotatably supported at the front end of the body member 60, and a plurality of cutter drive hydraulic motors 62 that rotate the cutter disk 61 with substantially the same diameter as the body member 60, A plurality of shield jacks 6 for advancing the cutter disc 61 together with the body member 60
3. Chamber 67 excavated by the cutter disk 61
Screw conveyor 64 that conveys the excavated soil inside in the rear,
The excavated tunnel Tb has an erector 65 to cover the segment 68 on the inner surface thereof, a tail seal 66 provided at the rear end of the body member 60, and the like.

The diameter of the second shield machine 1B is configured to be slightly smaller than the diameter of the circular sealing portion 10 in a side view of the first shield machine 1A. When the closing portion 10 is excavated with the cutter disk 61 to form the opening 15, a water stop mechanism 70 is provided to prevent water from flowing into the first shield machine 1A from the opening 15. .

As shown in FIG. 5, the water stopping mechanism 70 includes an annular groove 71 formed in the outer peripheral portion of the front end portion of the body member 60, an opening / closing cover 72 for opening and closing the annular groove 71, and an entire periphery of the annular groove 71. And a sealing member 75 whose front edge is fixed over the entire periphery on the outer peripheral side of the closing plate 73. A plurality of hydraulic jacks 7 provided in the body member 60 are provided on the inner surface of the rear portion of the opening / closing cover 72.
6 are connected via brackets 78, the hydraulic jacks 76 are driven synchronously, and the opening / closing cover 72 is opened / closed.

A long hole 79 through which a bracket 78 is inserted is formed in the body member 60, and the body members 61 on both front and rear sides of the long hole 79.
A pair of annular seals 79a, 79
9b is provided to prevent water from flowing into the body member 60 from the long hole 79. In the water stopping mechanism 70, the inner peripheral side of the opening 15 formed in the closing portion 10 in a state where the front end of the body member 60 of the second shield machine 1B penetrates into the inside of the first shield machine 1A. Is provided.

The sealing member 75 is formed by mounting a large number of strip-shaped metal pieces 75 in a plate material 75a made of polyurethane resin or rubber.
b is embedded in an aligned state over the entire circumference,
After the closing portion 10 of the first shield machine 1A is excavated with the cutter disk 61 to form the opening 15, water is press-fitted from the supply port 80 between the bottom surface of the annular groove 71 and the closing plate 73 to close the opening. The plate 73 swells to the outside, and the seal member 75 stands up.
The plate material 75a of the seal member 75 is pressed against the inner peripheral surface of
First shield excavator 1A from between body member 60 and opening 15
The inflow of water to the side can be prevented.

Next, the first shield excavator 1A and the second shield excavator 1B excavate in directions perpendicular to each other, and at the junction of the tunnels Ta and Tb, the first shield excavator 1A
FIGS. 6 to 11 show an underground joining method for joining the front end of the second shield excavator 1B to the side surface of the ground A at right angles in the ground.
This will be described with reference to FIG.

When the first shield excavator 1A reaches the junction where it joins with the second shield excavator 1B, the excavation stops and, as shown in FIG. 6, the rear part of the trunk member 2 of the first shield excavator 1A. And the segment 9 are fixed with a plurality of fixing brackets 80, and the components such as the cutter driving motor 4, the shield jack 5, the screw conveyor 6, and the elector 7 in the body member 2 are removed. Second shield machine 1B
Is stopped before the closing portion 10 of the first shield machine 1A and waits (see FIG. 7).

Next, as shown in FIG. 7, in the trunk member 2 of the first shield machine 1A, the open end of the casing 21 is fixed to the support member 12 by welding, and the inner surface of the sealing portion 10 is sealed. And the trunk member 2 facing the closing portion 10
When a plurality of support rods 24 are interposed between a plurality of receiving seats 23 provided on the inner peripheral surface of the casing 21 and a plurality of casings 21 to fix the same, the cutter disk 61 of the second shield excavator 1B excavates the sealing portion 10. The load can be supported through the support rod 24 and the receiving seat 23.

Next, a check boring pipe 25 made of a synthetic resin material is inserted from the inside of the casing 21 through the sealing portion 10 and faces the outside of the second shield excavator 1B. The relative position of 1B can be confirmed. Thereafter, a liquid filler (for example, mortar having a high foaming property) is injected from the injection port 21a of the casing 21 and solidified, and the solidified filler 22 is
The inner part of the sealing part 10 is sealed and the second shield machine 1
The sealing portion 20 can be excavated by the B disk cutter 61.

Next, the sealing portion 1 of the first shield machine 1A
Resuming the excavation of the second shield excavator 1B waiting just before 0, as shown in FIG. 8, check-boring the sealing portion 10 of the first shield excavator 1A with the cutter disk 61 of the second shield excavator 1B. Excavation with the pipe 25. Further, the second shield excavator 1B is excavated,
As shown in FIG. 9, the trunk member 6 of the second shield machine 1B
When the distal end of the second shield excavator 1B completely penetrates into the first shield excavator 1A, the excavation of the second shield excavator 1B is stopped.
In this state, the cutter disk 61 of the second shield excavator 1B is in a state of being excavated halfway through the sealing portion 20 after penetrating the sealing portion 10, and the sealing portion 2 remaining without being excavated.
0 prevents water from flowing into the first shield machine 1A from the opening 15.

Next, as shown in FIG. 10, the water stopping mechanism 70 provided in the second shield machine 1B is operated to
In a state where the inflow of water from the opening 15 formed in the first shield machine 1A into the first shield machine 1A is prevented, the support rod 24
3, the casing 21 and the remaining sealing portion 20 (filler 2
2) and the cutter disk 61 of the second shield machine 1B are removed, the tunnels Ta and Tb are removed.
Then, an inner peripheral surface portion including the segments 26 and 76 of the inner surfaces of the tunnels Ta and Tb is appropriately covered with a mortar 85.

According to the underground junction type shield excavator described above (the first and second shield excavators 1A and 1B), the second shield excavator 1B is attached to a part of the trunk member 2 of the first shield excavator 1A. Is provided with a sealing portion 10 made of a concrete material that can be excavated with the cutter disk 61 in order to penetrate the sealing disk 10, so that the sealing portion 10 is excavated with the cutter disk 61 of the second shield machine 1 </ b> B to form the opening 15. The front end of the trunk member 60 of the second shield machine 1B can be penetrated into the first shield machine 1A from the opening 15 and joined. Therefore, the worker does not need to go out of the shield machine and work, so that the work load can be reduced.

Further, the trunk member 6 of the second shield machine 1B
0 can be penetrated into the first shield machine 1 </ b> A and joined, so that the first shield can be inserted through the opening 15 formed in the sealing unit 10 by the simple structure and mechanism of the sealing unit 20 and the water blocking mechanism 70. Inflow of water into the excavator 1A can be prevented, and it is not necessary to improve the ground around the joint between the first and second shield excavators 1A and 1B. Therefore, it is possible to achieve excellent economy and safety and to shorten the construction period.

Furthermore, the first shield machine 1A has a relatively simple structure in which the sealing member 10 is provided on the body member 2, so that the manufacturing cost is very advantageous. Moreover, since the first shield excavator 1A is configured to have a larger diameter than the second shield excavator 1B, the front end of the trunk member 60 of the second shield excavator 1B can be reliably penetrated into the first shield excavator 1A. Can be.

Since the inner portion of the closing portion 10 of the first shield excavator 1A is sealed and the sealing portion 20 which can be excavated by the disk cutter 61 of the second shield excavator 1B is provided,
The cutter disk 61 of the second shield machine 1B excavates and penetrates the closing part 10 and then excavates the middle part of the sealing part 20 to cut the front end of the trunk member 60 of the second shield machine 1B. The first shield machine 1A can be penetrated. Therefore, the sealing portion 20 remaining without being excavated
Thereby, it is possible to reliably prevent water from flowing into the first shield machine 1A from the opening 15 formed in the sealing portion 10.

In addition, since the sealing portion 20 is made of the filler 21 which is filled and solidified in the casing 21 which seals the inner surface side of the sealing portion 10, the first shield excavator 1A and the second shield When joining the excavator 1B, the excavator can be provided very easily, which is very advantageous in shortening the construction period.

From the opening 15 formed in the sealing portion 10, the first
Since the water stop mechanism 70 for preventing water from flowing into the shield machine 1A is provided, the first shield machine 1A and the second shield machine
After joining with the shield machine 1B, the sealing portion 20 (filler 22) and the casing 21 are disassembled and removed in a state in which water is prevented from flowing into the first shield machine from the opening 15 by the water stopping mechanism 70. It can be removed. In the water stopping mechanism 70, even when the muddy water pressure is high, the inflow of water into the first shield machine can be reliably prevented.

According to the above-described underground joining method of the underground shield type excavator, the second shield excavator 1B is used to penetrate the second shield excavator 1B into the side surface of the first shield excavator 1A. A sealing part 10 made of a concrete material that can be excavated is formed in advance, and the sealing part 10 is excavated by the second shield excavator 1B, and the front end of the second shield excavator 1B is moved to the first end.
The first and second parts are inserted into the body of the shield machine 1A.
Since the shield excavators 1A and 1B are joined underground, there is no need for an operator to go out of the shield excavator and work, and the operator can move the shield excavator 1A into the first shield excavator 1A from the opening 15 formed in the sealing portion 10. Since it is possible to easily take a water stoppage measure (sealing part 20 and water stop mechanism 70) for preventing the inflow of water, the ground around the joint between the first and second shield excavators 1A and 1B is removed. It is no longer necessary to improve the ground, and it is possible to reduce the work load and shorten the construction period, which is excellent in economy and safety.

Next, a modified embodiment in which the above-described embodiment is partially modified will be described. 1) As shown in FIG. 12, instead of the water stop mechanism 70, a water stop mechanism 70A applicable when the water pressure is low may be provided. In this water stopping mechanism 70A, a mortar injection pipe 86 is provided on the outer peripheral portion of the front end portion of the body member 60 of the second shield excavator 1B, and the tip end of the body member 60 of the second shield excavator 1B is connected to the first shield excavator 1B. In the state where it penetrated into the machine 1A,
The mortar is injected from the mortar injection pipe 86 between the opening 15 and the body member 60 to stop water.

2) The first shield excavator 1B is provided with both water stop mechanisms 70 and 70A, and the water stop mechanisms 70 and 70A are provided in accordance with the water pressure at the junction between the first and second shield excavators 1A and 1B.
By using one of the sealers 70A, it may be configured to prevent water from flowing into the first shield machine 1A from the opening 15 formed in the sealing part 10. 3] In the above embodiment, the first and second shield machine 1
A and 1B were joined by aligning the height positions of their axes, but the arrangement of the sealing portion 10 was changed, and the first shield machine 1
A second shield machine 1B above or below the side of A
May be joined together.

[0049]

According to the underground joint type shield excavator of the first aspect, concrete that can be excavated by the cutter disk to penetrate a part of the trunk member of the first shield excavator with the second shield excavator. A sealing part made of a material is provided, and the sealing part is excavated with a cutter disk of the second shield excavator to form an opening, and the front end of the trunk member of the second shield excavator is cut from the opening into the first shield excavator. The construction is such that it penetrates into the shield excavator, eliminating the need for the operator to work outside the shield excavator and preventing water from flowing into the first shield excavator through the opening formed in the sealing section. Therefore, it is not necessary to improve the ground around the joint between the first and second shield excavators. Therefore, it is possible to achieve excellent economy and safety, and to reduce the work load and shorten the construction period. Further, in the first shield machine, since only the sealing portion needs to be provided on the body member, the structure is not relatively complicated and the production cost is advantageous.

According to the underground joint type shield excavator of the second aspect, the same effect as that of the first aspect is obtained, but since the first shield excavator is configured to have a larger diameter than the second shield excavator, The front end of the trunk member of the two-shield machine can be reliably penetrated into the first shield machine.

According to the third aspect of the present invention, the same effect as that of the second aspect is obtained, but when the first shield excavator and the second shield excavator are joined, the sealing portion is not used. A sealing portion for sealing an inner portion of the first shield excavator which can be excavated by a disk cutter of a second shield machine.
Since it was provided in the shield excavator, the cutter disk of the second shield excavator was used to excavate the sealed part of the first shield excavator, penetrate it,
The front end of the trunk member of the second shield machine penetrates into the first shield machine. Therefore, it is possible to reliably prevent water from flowing into the first shield machine from the opening formed in the sealing portion by the sealing portion remaining without being excavated.

According to the underground joint type shield excavator of the fourth aspect, the same effect as that of the third aspect is obtained, but the sealing portion is filled in a casing for sealing the inner surface side of the sealing portion. Since the first shield excavator and the second shield excavator are joined to each other, the sealing portion can be easily provided, because the solid filler is used.

According to the shield excavator of the fifth aspect, the same effect as in any one of the first to fourth aspects is obtained, but the outer periphery of the front end portion of the trunk member of the second shield excavator is provided. The part is provided with a water stopping means for preventing water from flowing into the first shield machine from the opening formed in the sealing part, so that after the first shield machine and the second shield machine are joined, In a state in which water is prevented from flowing into the first shield machine from the opening formed in the sealing portion by the water stopping means, the sealing portion can be disassembled and removed.

According to the underground joining method of the underground joint type shield excavator of the sixth aspect, the second shield excavator can be excavated in order to make the second shield excavator penetrate into the side surface of the first shield excavator. A sealing part made of a concrete material is formed in advance, the sealing part is excavated by the second shield excavator, and a front end of the second shield excavator is protruded into a body member of the first shield excavator to form the first and the second shield excavators. Since the second shield excavator is joined underground, it is not necessary for an operator to go out of the shield excavator and work, and water is prevented from flowing into the first shield excavator through the opening formed in the sealing portion. It is possible to easily take measures to stop water, which eliminates the need to improve the ground around the joint between the first and second shield excavators, which is excellent in economy and safety and reduces the workload. And shorten the construction period Possible to become.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a first shield machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of the first shield machine.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a vertical sectional side view of a second shield machine.

FIG. 5 is an enlarged sectional view of a main part of FIG. 2;

FIG. 6 is an explanatory diagram showing a state of a first surface of the underground bonding method.

FIG. 7 is an explanatory diagram showing a state of a second surface of the underground bonding method.

FIG. 8 is an explanatory diagram showing a state of a third surface of the underground bonding method.

FIG. 9 is an explanatory diagram showing a state of a fourth surface of the underground bonding method.

FIG. 10 is an explanatory diagram showing a state of a fifth surface of the underground bonding method.

FIG. 11 is an explanatory diagram showing a state of a sixth surface of the underground bonding method.

FIG. 12 is a diagram showing an underground joining method of a second shield machine and a first shield machine having a water stopping mechanism according to a modified embodiment.

[Explanation of symbols]

 Reference Signs List 1A First shield excavator 1B Second shield excavator 2,60 Body member 3,61 Cutter disk 10 Sealing part 15 Opening 20 Sealing part 21 Casing 22 Filler 70, 70A Water stopping means

Claims (6)

[Claims] A first shield excavator; a first shield excavator;
An underground joint type shield excavator in which a front end of a second shield excavator is orthogonally joined in the ground to a side surface of a shield excavator, wherein a part of a trunk member of the first shield excavator is provided. In order to penetrate the second shield machine, a sealing part made of a concrete material excavable with the cutter disk is provided, and the sealing part is excavated with the cutter disk of the second shield machine to form an opening. An underground joint type shield excavator, wherein a front end portion of a trunk member of a second shield excavator is penetrated into and joined to the first shield excavator from an opening. 2. The machine according to claim 1, wherein the first shield excavator has a larger diameter than the second shield excavator.
An underground joint type shield machine described in (1). 3. A sealing portion for sealing an inner portion of the sealing portion when joining the first shield excavator and the second shield excavator, and can be excavated by a disk cutter of the second shield excavator. The underground joint-type shield machine according to claim 2, wherein a proper sealing portion is provided in the first shield machine. 4. The underground bonding type according to claim 3, wherein the sealing portion is formed of a filler that is filled in a casing that seals an inner surface side of the sealing portion and is solidified. Shield machine. 5. An outer peripheral portion of a front end portion of a trunk member of the second shield excavator, a first portion of which is formed through an opening formed in the sealing portion.
The underground junction type shield machine according to any one of claims 1 to 4, further comprising a water stopping means for preventing inflow of water into the shield machine. 6. A method of joining an underground junction type shield excavator in which a front end of a second shield excavator is orthogonally joined in the ground to a side surface of a first shield excavator, wherein the first shield excavation is performed. In order to allow the second shield machine to penetrate into the side surface of the machine, a sealing part made of a concrete material excavable by the second shield machine is previously formed, and the seal part is excavated by the second shield machine. A method of joining an underground joint type shield excavator, wherein a front end of a shield excavator is inserted into a body member of a first shield excavator to join the first and second shield excavators underground.