JP3347312B2 - Underground joining type shield machine and underground joining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground junction type shield excavator and an underground joining method thereof, and more particularly to a technique for improving a water stopping structure for stopping a joint at the time of underground joining.

[0002]

2. Description of the Related Art In recent years, tunnels for water supply and sewerage, common trenches, and the like are often excavated by a shield method, in which case the construction period is limited, and the distance that can be excavated by one shield excavator is limited. In many cases, a plurality of shafts are provided, and the space between the shafts is dug by each shield machine. The tunnel may have the same diameter or the diameter may change along the way.

In the case of a tunnel formed underground in an urban area,
Since structures are often congested both underground and underground, it is not possible to form a shaft, so two shield excavators of the same diameter or different diameters are dug in the approaching direction from the separation point, and two shield excavators are installed. Various technologies have been proposed and put into practical use for excavating in the approaching direction from a separation point and finally joining the front ends of two shield excavators underground (Japanese Patent Publication No. 5-88).
357, Japanese Patent No. 259430, and
-193690). After joining the two shield excavators underground, an operator removes the internal structural materials and attached devices of both shield excavators while leaving the body members and the like of both shield excavators underground.

Japanese Patent Publication No. Hei 5-88357, Japanese Patent No. 25
No. 9430 discloses an underground joint type shield excavator in which two shield excavators having the same diameter are joined underground via a penetration ring. In this underground connection type shield excavator, the cylindrical penetration ring provided near the inside of the front body of the penetration shield excavator is sequentially extruded with a plurality of extrusion jacks and partially into the front end of the reception side shield excavator. Then, the distal end of the penetration ring is pressed against a rubber receiving ring to stop water.

In some cases, the receiving ring is fixedly provided. Recently, however, the receiving ring is provided so as to be movable in an annular gap between the outer cylinder and the inner cylinder. It is configured to be retracted into the deep end of the annular gap, and to advance the receiving ring to press against the tip of the penetrating ring during underground joining.

Here, the applicant of the present application has disclosed in Japanese Patent Laid-Open No. 11-19 / 1999.
In Japanese Patent No. 3690, the penetration ring of the penetrating shield excavator is pushed forward to partially penetrate into the front end of the receiving shield excavator, and the protection cylinder member of the receiving shield excavator is retracted so that the water stopping mechanism is provided. An underground joint type with a water-stop structure that injects pressurized water to the outside of the water-stop mechanism after the inner side is opened, and presses the annular seal member of the water-stop mechanism against the outer peripheral surface of the penetration ring to stop the water. A shield machine was proposed.

[0007]

[Problems to be Solved by the Invention]
The receiving ring disclosed in Japanese Patent No. 357 and Patent No. 259430 is arranged inside the vicinity of the front end of the front body, so that the receiving ring rubs against the earth and sand in the chamber behind the cutter disc during normal shield excavation. If it is easily worn and the amount of wear is large, it will not be possible to secure the water stopping function after underground joining. Moreover, earth and sand and gravel are likely to bite between the receiving ring and the tip of the penetrating ring, and the water stoppage tends to decrease.

In the underground junction type shield excavator disclosed in Japanese Patent Application Laid-Open No. 11-193690, sediment, gravel, etc. are deposited on the inner surface of the front end of the front body of the receiving shield excavator, especially around the bottom, and the protective cylinder When the member retreats, there is a possibility that earth and sand and gravel are drawn into the inner peripheral surface (sheet surface) of the annular seal member of the water stopping mechanism. Therefore, earth and sand, gravels, and the like adhere to the annular seal member of the water stopping mechanism, and even when the annular seal member is pressed against the penetration ring in this state, the earth and sand, gravels, and the like bite into the inner peripheral surface of the annular seal member, and the water stops. Decrease. Moreover, the annular seal member is damaged or worn. If the water stoppage decreases, or if the inner peripheral surface of the annular seal member is damaged or worn, soil pressure will flow violently into the shield machine, and after ground bonding, the worker will enter the inside and safely inside Equipment and accessories cannot be removed. Further, the pressure of the soil water flowing into the inside must be discharged by a plurality of operators using a pump or the like, which increases the cost and the construction period.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the water stopping performance, prevent damage and abrasion of a water stopping sealing member, and allow an operator to work safely inside underground after joining underground. An object of the present invention is to provide a joint type shield machine and an underground joining method thereof.

[0010]

According to a first aspect of the present invention, there is provided an underground shield type shield machine comprising: a first shield machine; and a second shield machine having a diameter equal to or greater than the diameter of the first shield machine. The first shield machine has a cylindrical penetrating ring mounted near the inside of its front body so as to be movable in the axial direction of the tunnel, and is driven to push until the penetrating ring is partially inserted into the second shield machine. And a spoke reducing means for reducing the diameter of the tip of the cutter spoke of the cutter disk in the radial direction to form a passage gap for the penetrating ring. In the underground junction type shield excavator which is excavated to join the two underground, the second shield excavator includes a cutter spoke of a cutter disc for forming a passage gap of the penetration ring. Spoke diameter reducing means for radially reducing the distal end or the radial middle part of the penetration ring, and water stopping means for stopping water through an annular seal member pressed against the outer peripheral surface or the inner peripheral surface of the penetration portion of the penetration ring. A protection ring provided between the vicinity of the front end of the front body of the second shield machine and the inner body inside the front body, for blocking and protecting the inner peripheral surface or outer peripheral surface of the water stopping means; Reversing drive means capable of driving the protection ring backward until the means is changed from the closed state to the open state; and a plurality of infusion agent discharge pipes for discharging the infusion from the front end of the protection ring toward the front when the protection ring is retracted. And the water stoppage
From the front end of the protective ring after water stoppage by means
Equipped with multiple backing agent injection pipes for injecting backing agent,
The plurality of injecting agent discharge tubes also serve as the plurality of backing agent injecting tubes
Injection configured to supply infusate to infusate discharge tube
And a backing agent supply for supplying the backing agent to the backing agent injection tube.
A directional control valve is provided for enabling either one of the supply sources to be selected .

When the first and second shield excavators are excavated in the phase approaching direction and are joined underground, the cutter disks of the both shield excavators are approached to each other and the excavation is stopped. The spoke diameter reducing means of the machine is reduced in diameter to form a clearance for the penetration ring, and then the penetration ring of the first shield machine is pushed out to the vicinity of the cutter disk of the second shield machine.

Next, an injectate is respectively injected from each injectate discharge pipe,
For example, the protection ring is moved backward to a predetermined position by the backward drive means while discharging at a pressure of about 10 kg / cm ² . Next, the penetration ring is further pushed out to drive the annular sealing member into pressure contact with the penetration ring to stop water. Therefore,
At the time of retreat of the protection ring, gravel and the like between the vicinity of the front end of the front trunk of the second shield machine and the inner trunk can be removed by the injecting agent, and the inner peripheral surface or the outer peripheral surface (sheet surface) of the annular seal member of the water stopping means is prevented. ) Can prevent sediment and gravel from adhering to
When the annular seal member is pressed against the penetrating ring, earth and sand, gravel, and the like do not bite into the inner peripheral surface or the outer peripheral surface of the annular seal member, and the water stopping performance is remarkably improved. Thereafter, a backing agent such as mortar is injected into the periphery of the water stopping means to further stop the water, and the muddy water in the chamber is discharged. Then, the operator enters the penetrating ring and the inside of the second shield excavator from the chamber. A sealing member is welded to the body to stop water.

Further, equipped with multiple Urakomi injection tube for injecting Urakomi agent forward from the front end of the protection ring after stopping water by the water-stopping means. Therefore, a backing agent such as mortar or the like can be injected from each backing agent injection pipe into the periphery of the water stopping means to stop water.

[0014] The plurality of infusate discharge pipe is configured to also serve a plurality of Urakomi injection tube, an injection agent supply source for supplying infusate to the infusate discharge pipe, the Urakomi injection tube A direction switching valve is provided to enable selection of one of the backing agent supply sources for supplying the backing agent . Therefore, since the tube is also used, and either the injectant supply source or the backing agent supply source can be selected by the directional switching valve, the piping space can be reduced and the manufacturing cost can be significantly reduced. Can be.

According to a second aspect of the present invention, there is provided an underground shield type shield machine.
In the invention described in claim 1, the water stopping means is provided on an inner peripheral portion near the front end of the front body, and is stopped via an annular seal member pressed against an outer peripheral surface of a penetrating portion of the penetrating ring. A backing agent injection path for injecting the backing agent into the outer peripheral side of the penetrating ring is formed inside the cylindrical wall of the penetrating ring. After the water is stopped by the water stopping means, a backing agent such as mortar is injected into a peripheral portion of the water stopping means from the backing agent injection path to stop the water.
In some cases, the backing agent may be supplementarily injected into the periphery of the water stopping means from the backing agent injection pipe.

According to a third aspect of the present invention, there is provided an underground junction type shield machine.
In the invention as set forth in claim 1, the water stopping means is provided on an outer peripheral portion near a front end of the inner body, and is stopped by an annular seal member pressed against an inner peripheral surface of a penetrating portion of the penetrating ring. The injecting agent discharge pipe is configured to bend so that the distal end portion of each injecting agent discharge pipe is bent toward the annular seal member. Therefore, earth and sand, gravels, and the like on the outer peripheral surface (sheet surface) of the annular seal member of the water stopping means can be reliably removed, and it is possible to prevent soil, gravels, and the like from adhering to the outer peripheral surface of the annular seal member.

According to a fourth aspect of the present invention, there is provided an underground joining method for an underground shield type excavator, wherein a first shield excavator and a second shield excavator having a diameter equal to or larger than the diameter of the first shield excavator are brought close to each other. In the underground joining method of joining the front ends of the two underground by excavating in the direction, the first and second shield excavators are brought close to a state where both cutter disks approach and face each other. The tip of the cutter spoke of the cutter disc is radially reduced to form a penetration ring passage gap, and the tip or the middle of the cutter spoke of the cutter disc of the second shield machine is radially reduced. A first step of forming a penetrating ring passage gap, and driving the penetrating ring to a position near a cutter disk of a second shield excavator, near a front end of a front trunk of the second shield excavator; A second step of retracting the protective ring to a predetermined position while discharging the injection agent from the front end of the protective ring movably mounted in the tunnel axial direction between the inner ring and the inner ring of the protective ring. A third sealing member for pressing the annular seal member of the water stopping means against the outer peripheral surface or the inner peripheral surface of the penetrating portion of the penetrating ring by further pushing out the penetrating ring.
Through the backing agent injection passage inside the cylindrical wall of the penetration ring.
Fourth step of injecting the backing agent into the outer peripheral side of the penetration ring
And a seal between the penetration ring and the inner shell of the second shield machine.
And a fifth step of welding the chain member to stop water .

In the case where the first and second shield excavators are joined underground, in the first step, the cutter disks of both shield excavators are brought closer to and opposed to each other, and the tip of the cutter spoke of the cutter disk of the first shield excavator is approached. The diameter of the portion is reduced in the radial direction, and almost in parallel with this, the distal end or the middle of the cutter spoke of the cutter disk of the second shield machine is reduced in the radial direction to form a penetration ring passage gap, In the second step, the penetrating ring is pushed out to the vicinity of the cutter disk of the second shield excavator, and the protective ring is discharged to the front from the front end of the protective ring, and the protective ring is moved to a predetermined position (that is, the water stopping means is opened). Position)
Retreat until In the third step, the penetration ring is further pushed out, and the annular seal member of the water stopping means is pressed against the outer peripheral surface or the inner peripheral surface of the penetration ring. In addition, the same operation as the first aspect is basically achieved.

Further, after the third step, a fourth step of injecting a Urakomi agent on the outer peripheral side of the penetration ring via Urakomi injection passage of the internal cylindrical wall of the penetration ring, said penetration ring and second Fifth, the sealing member is welded to the inner body of the shield machine and water is stopped.
And a process . Therefore, in the fourth step, a backing agent such as mortar is injected into the outer peripheral side of the penetrating ring through the backing agent injection passage inside the cylindrical wall of the penetrating ring. Then, in a fifth step, the sealing member is welded to the penetration ring and the inner shell of the second shield machine from inside the chamber to stop water.

The ground joining method of underground junction shield machine according to claim 5 is the invention of claim 4, between the fourth step or the fourth step and the fifth step, it is equipped to protect the ring The backfill is injected from the backfill injection tube. Therefore, it is possible to further improve the water stopping property of the peripheral part of the water stopping means and to safely weld the sealing member from inside the chamber to stop the water.

According to a sixth aspect of the present invention, an underground joining method for an underground shield type shield machine comprises the steps of: providing a first shield machine;
And a second shield machine with the same or larger diameter.
Drill in the approaching direction and join the front ends of the two underground
Underground joining method, the first and second shield machine
Bring both cutter disks closer to each other.
The cutter disk cutter of the first shield machine
Pass the penetration ring by reducing the diameter of the spoke tip in the radial direction
To form a gap, mosquito second shield machine Potter
Make the tip or middle of the disc cutter spoke
1st process to form a gap for penetrating ring
And inserting the penetration ring into the cutter of the second shield machine
The second shield excavator driven by pushing to the vicinity of the disk
Between the vicinity of the front end of the front torso and the inner torso inside
The front end of a protective ring movably mounted in the axial direction
Protective ring while discharging injectant
A second step of retreating to a fixed position, and the penetration ring
Is further extruded, and the outer peripheral surface of the penetration portion of the penetration ring or
Is the third for pressing the annular sealing member of the water stopping means against the inner peripheral surface.
And after the third step, a step of injecting the backing agent forward from a backing agent injection pipe provided in the protection ring, and after this step, the penetration ring and the second shield excavator Welding a sealing member to the inner body to stop water. Since the backing agent injection path of the penetration ring can be omitted, the penetration ring can be made thinner, the weight of the first shield machine can be reduced, and the production cost can be reduced. Moreover, the structure of the penetration ring can be simplified. So
Has the same effect as the other paragraph 0018.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. In this underground joint type shield excavator, two shield excavators are dug in a phase approaching direction to join them underground, and the first and second body members have the same outer diameter. It has shield machines 1A and 1B.

First, the penetrating shield excavator 1A will be described. The excavation direction is defined as the front, and the left and right are defined as the left and right toward the front. As shown in FIG.
The shield machine 1 </ b> A includes a cutter disk 2 for excavating a face, a chamber 3, a cylindrical front body 4, a cutter rotation drive mechanism 5 for rotating and driving the cutter disk 2,
A rear trunk 6 connected to the rear end of the front trunk 4, a shield jack 7 for generating a digging thrust, an erector device 8 for attaching a segment S to a tunnel shaft wall, and discharging excavated earth and sand to the outside. Sludge discharge equipment 9 and penetration ring 1 partially penetrated into the front end of shield machine 1B during underground joining
0.

The cutter disk 2 will be described.
The cutter disc 2 includes a center frame 11, a plurality of extendable and retractable cutter spokes 12 extending radially from the center frame 11, a ring frame 13, an annular outer peripheral ring 14 having the same diameter as the front body 4, and a cutter spoke. 12 has a number of cutter bits 15 and the like. Each of the cutter spokes 12 is a fixed cutter spoke 12a extending from the center to the vicinity of the outer periphery, a hydraulic cylinder 16 (corresponding to spoke diameter reducing means), and a movable cutter spoke forming the tip of the cutter spoke 12, and is a hydraulic cylinder. And a movable cutter spoke 12b that is driven to move in the diameter reducing direction by the movable cutter spoke 16. In the case of underground joining, the movable cutter spoke 12b is radially reduced in diameter by a hydraulic cylinder 16 for forming a passage gap of the penetration ring 10.

An outer peripheral ring 14 is provided on an outer peripheral portion of the cutter disk 2. The outer peripheral ring 14 is formed with an engaging portion 14a with which a tip of a movable cutter spoke 12b is engaged. 12b
Are engaged with the engaging portion 14a. Any one of the plurality of cutter spokes 12
A copy cutter 18 is provided on the cylinder body of the hydraulic cylinder 16.
The piston rod of the hydraulic cylinder 19 is fixed to the cylinder body of the hydraulic cylinder 16. A cutter 20 is fixed radially outward to the cylinder body of the hydraulic cylinder 19, and when the hydraulic cylinder 19 is extended, the cutter 20 advances to the outer peripheral side of the outer peripheral ring 14.

As shown in FIG. 1, a partition 21 is provided on the front body 4.
A support wall 22, annular web members 23 and 24, and the like are provided. The partition wall 21 is provided inside the vicinity of the front end of the front body 4 to form the chamber 3, and the partition wall 21 has an annular concave portion 21a. An annular connecting frame 17 for supporting the cutter disk 2 is fixed to the rear surface of the cutter disk 2.
a and is rotatably supported in a liquid-tight manner. The cutter disk 2 is provided with a hydraulic system for supplying a hydraulic pressure to the hydraulic cylinders 16 and 19 and a swivel joint 25 for a humidifier supply system for supplying a humidifier to the humidifier nozzle. The earth and sand in the chamber 3 is agitated with the water supplied from the water supply pipe 9a of the sludge discharge equipment 9, and is discharged from the sludge discharge pipe 9b to the outside.

The cutter rotation drive mechanism 5 will be described. A ring gear 26 is fixed to the rear end of the connection frame 17, and a plurality of cutter drive motors 27 are provided behind the annular concave portion 21a of the partition 21. The pinion at the tip of the output shaft of the cutter drive motor 27 is
, And the cutter disk 2 is driven forward and reverse by the plurality of cutter drive motors 27.

The rear body 6 will be described. A cylindrical rear body 6 is connected to the rear end of the front body 4, and a plurality of brackets 28 are provided inside the front end of the rear body 6. A plurality of tail seals 29 are provided at the rear end for preventing earth and sand from entering the inside of the shield machine 1A. A rear working deck 30 is provided inside the rear trunk 6, and the rear working deck 30 is provided with a perfect circle holding device 31 for keeping the segment S in a perfect circle.

The shield jack 7 will be described.
Inside the rear part of the front trunk 4, a plurality of shield jacks 7 are disposed rearward at appropriate intervals in the circumferential direction. The jack bodies of these shield jacks 7 are fixed to an annular web 24, and the front end of the jack body is an annular web. The material 23 is received from the front side. A spreader 3 is attached to the tip of the piston rod of each shield jack 7 via an eccentric fitting 32.
3 is pin-connected. The piston rod of each shield jack 7 is extended, and the spreader 33 is connected to the tunnel Ta.
When abutting against and pushing against the front end of the segment S lining the inner surface of the slab, a digging thrust is generated.

The erector device 8 will be described. The erector device 8 has a rotary drum 34, an electric body 35 and an electric or hydraulic drive motor (not shown) for driving the rotary drum 34 to rotate. Are provided with support rollers 36, respectively, and the rotating drum 34 is rotatably supported by the plurality of support rollers 36. Tunnel Ta
Every time one ring is excavated, the
The segment S is attached over the entire circumference of the tunnel shaft wall for the ring.

The sludge discharging equipment 9 will be described. The sludge discharging equipment 9 includes a water pipe 9a for sending muddy water into the chamber 3, and a sludge pipe 9 for discharging the excavated earth and sand in the chamber 3 to the outside.
b, an agitator 9c for stirring the earth and sand and muddy water in the chamber 3 and the like. A valve is interposed in each of the water pipe 9a and the drain pipe 9b, and a valve is also interposed in the bypass pipe connecting the water pipe 9a and the drain pipe 9b. Muddy water is supplied to the chamber 3 from a water supply source extending from a rear shaft via a water supply pipe 9a, and the earth and sand in the chamber 3 are stirred by an agitator 9c to become more dense muddy water. It is discharged to the outside through the shaft in the rear.

Next, the penetration ring 10 and its pushing mechanism will be described. As shown in FIGS. 1 and 4, in the vicinity of the inside of the front half of the front body 4, the front body 4, the cylindrical member 37, and the annular sealing plate 37 a form a cylindrical ring housing portion 38 having an open front end, A cylindrical penetration ring 10 is
Are arranged concentrically with the front trunk 4, and the penetrating ring 10 is provided so as to be movable forward in the tunnel axial direction in the ring accommodating portion 38. Both the inner and outer surfaces of the penetrating ring 10 are sealed by a sealed ring member on the inner surface of the front end of the cylindrical member 37 and a sealed ring member on the inner surface near the front end of the front barrel 4.
The earth and sand are prevented from flowing into the ring storage section 38.

A plurality of extrusion jacks 39 (corresponding to extrusion means) for driving the penetration ring 10 until it is partially inserted into the second shield excavator 1B are provided near the inner periphery of the rear portion of the front body 4. Have been. A plurality of fixed pushing rods 40a are fixed to the rear end of the penetrating ring 10 so as to face the pushing jacks 39. When pushing out the penetrating ring 10 by the push-out jacks 39, the push-in rods 40 are pushed out to the respective fixed push-down rods 40a, and the push-in ring 10 is pushed out and driven by the plural push-out jacks 39.

As shown in FIG. 8 and FIG.
A backing agent injection path 10a for injecting a backing agent such as mortar, for example, on the outer peripheral side of the penetrating ring 10 is formed inside the cylindrical wall of the backing agent. (Comprising a backing agent storage tank, a pump, a motor, various valves, etc.).

Next, the receiving-side shield machine 1B will be described. It is to be noted that the direction of the excavation is defined as the front, and the left and right are defined as the left and right toward the front. As shown in FIG.
The shield machine 1 </ b> B includes a cutter disk 50, a chamber 51, a front body 52, a cutter rotation drive mechanism 53 that drives the cutter disk 50 to rotate, a rear body 54 connected to a rear end of the front body 52, A plurality of shield jacks 55 for generating thrust, an erector device 56 for assembling the segment S to the tunnel pit wall, a mud discharging facility 57 for discharging the excavated earth and sand to the outside, Water stopping mechanism 58 that seals against the inflow of earth pressure
(Water stopping means), a protection ring 59 for closing and protecting the inner peripheral surface side of the water stopping mechanism 58, a retreat driving hydraulic cylinder 60 (corresponding to retreat driving means) of the protection ring 59,
A plurality of injecting agent discharge tubes 61 (see FIG. 5) are provided.

As shown in FIG.
Is a center frame 62, a ring frame 63,
An annular outer ring 64 having the same diameter as the front trunk 52, a plurality of extendable and retractable cutter spokes 65 extending radially from the center frame 62, a large number of cutter bits 66 provided on the cutter spokes 65, and the like.

Each of the cutter spokes 65 is a fixed cutter spoke 65a extending from the center frame 62 to the vicinity of the outer periphery, a hydraulic cylinder 67 (corresponding to spoke diameter reducing means), and a movable cutter spoke forming the tip of the cutter spoke 65. And a movable cutter spoke 65b driven by the hydraulic cylinder 67 in the diameter reducing direction. The piston rod of the hydraulic cylinder 67 is fixed to the fixed cutter spoke 65a, and the movable cutter spoke 65
b is formed integrally with the cylinder body of the hydraulic cylinder 67, and the movable cutter spoke 65b is reduced in diameter in the radial direction by the hydraulic cylinder 67 to form a passage gap for the penetration ring 10 during underground joining.

The outer peripheral ring 64 is formed with an engaging portion 64a with which the tip of the movable cutter spoke 65b is engaged, and the tip of the movable cutter spoke 65b is engaged with the engaging portion 64a during tunnel excavation. A copy cutter 68 is provided on the cylinder body of the hydraulic cylinder 67 of any one of the plurality of cutter spokes 65.
Is provided, the copy cutter 68 includes a hydraulic cylinder 69 and a cutter 70, and a piston rod of the hydraulic cylinder 69 is fixed to a cylinder body of the hydraulic cylinder 67, and a cutter 70 is provided radially outward on the cylinder body of the hydraulic cylinder 69. When the hydraulic cylinder 69 of the copy cutter 68 is extended, the cutter 70 advances to the outer peripheral side of the outer peripheral ring 64.

As shown in FIGS. 2 to 10, the front trunk 52 has the same diameter as the front trunk 4 of the penetrating shield excavator 1A, and the front trunk 5
2, an inner body 71 is joined in parallel at a predetermined interval inside the vicinity of the front end. That is, the inner trunk 71 is disposed such that the tip of the inner trunk 71 is located at a position slightly retreated from the tip of the front trunk 52, and the rear end of the inner trunk 71 is connected to the flange portion 52 a of the front trunk 52 and the support wall. Extends to 72 and is joined,
An L-shaped frame 73 is welded to a substantially middle portion in the length direction of the inner body 71. A reinforcing member 74 is joined obliquely over the distal end of the inner body 71 and the L-shaped frame 73.

A partition 75 substantially similar to that of the penetrating shield excavator 1A is provided inside the inner trunk 71, and annular web members 76, 77 and the like are provided on the inner surface of the front trunk 52. The chamber 51 is formed between the cutter disk 50 and the partition 75 and the L-shaped frame 73, and the partition 75 has an annular concave portion 75 a formed therein. Cutter disk 50
An annular connecting frame 78 for supporting the cutter disk 50 is fixed to the rear surface of the connecting frame 7.
Reference numeral 8 is inserted into the annular concave portion 75a of the partition wall 75 and is rotatably supported in a liquid-tight manner. A swivel joint 79 for supplying hydraulic pressure from a hydraulic supply source to hydraulic cylinders 67 and 69 of the cutter disk 50 is supported at the center of the partition 75.

The cutter rotation driving mechanism 53 will be described. A ring gear 80 is fixed to the rear end of the connection frame 78, and a plurality of cutter driving motors 81 are fixed to the rear side of the annular concave portion 75a. The pinion at the tip of the output shaft is meshed with the ring gear 80, and the cutter drive motor 81 drives the cutter disk 50 to rotate forward and reverse.

The rear trunk 54 will be described. A cylindrical rear trunk 54 is connected to the rear end of the front trunk 52, and a plurality of brackets 82 are fixed inside the front end of the rear trunk 54. A plurality of tail seals 83 are provided to prevent earth and sand from flowing into the inside of the shield machine 1B. A rear work deck 84 is provided inside the rear trunk 54, and the rear work deck 84 is provided with a perfect circle holding device 85 for keeping the segment S in a perfect circle.

The shield jacks 55 will be described. A plurality of shield jacks 55 are arranged rearward at appropriate intervals in the circumferential direction inside the rear portion of the front trunk 52, and the jack body of each shield jack 55 is formed of an annular web material. 7
7, the front end of each jack body is an annular web material 7
6 is received. A spreader 87 is connected to the distal end of the piston rod of each shield jack 55 via an eccentric fitting 86 with a pin.
Is extensible, and the spreader 87 is brought into contact with the front end of the segment S covered on the inner surface of the tunnel Tb and pressed, thereby generating a digging thrust.

The erector device 56 will be described. The erector device 56 includes a rotating drum 88 and the erector body 8.
9 and an electric or hydraulic drive motor (not shown) for driving the rotary drum 88 to rotate. Each bracket 82
, A supporting roller 90 is rotatably supported, and the rotating drum 88 is rotatably supported by a plurality of supporting rollers 90. Each time the ring is excavated by one ring, the segmenter S is assembled by the erector device 56 over the entire circumference of the tunnel wall of one ring.

The mud discharging equipment 57 will be described. The mud discharging equipment 57 is a water pipe 57a for feeding mud water into the chamber 51.
And a mud pipe 57b for discharging the excavated earth and sand in the chamber 51 to the outside, and an agitator 57c for agitating the excavated earth and sand in the chamber 51 and the muddy water. Water pipe 5
A valve is interposed in each of the drain pipe 7a and the drain pipe 57b, and a valve is also interposed in a bypass pipe connecting the water supply pipe 57a and the exhaust pipe 57b.

Next, a water stopping mechanism 58 and a protection ring 59 for stopping water at the joint where the shield machine 1A and 1B are joined underground.
Will be described. As shown in FIGS. 3 to 10, a water stopping mechanism 58 is provided on the inner surface of the front end of the front trunk 52, and a box structure protection is provided between the vicinity of the front end of the front trunk 52 and the inner trunk 71. A ring 59 is provided to close and protect the inner peripheral side of the water stopping mechanism 58.

The water stopping mechanism 58 includes an annular recess 91 formed in the inner surface of the front end of the front body 52, an annular elastic membrane member 92,
It has an annular seal member 93 and a pressurized water injection mechanism including a pressurized water injection pipe. The annular concave portion 91 is provided with a flexible annular elastic membrane member 92, and the front end of the annular elastic membrane member 92 is fixed to the front body 52 by an annular stopper 94 and a bolt. The rear end is an annular stopper 95
And to the front body 52 with bolts.

An annular seal member 93 is provided inside the annular elastic membrane member 92, and the rear end of the annular seal member 93 is fixed by a stopper 96. The annular seal member 93 includes
A structure in which a large number of thin elastically deformable elastic plates having a predetermined small width in the circumferential direction are wrapped with a synthetic rubber material or a synthetic resin material having excellent elasticity and arranged in such a manner as to be partially wrapped in the circumferential direction and arranged. belongs to.

Next, a description will be given of the protection ring 59 and the reverse drive hydraulic cylinder 60 capable of driving the protection ring 59 backward until the water stopping mechanism 58 is changed from the closed state to the open state. As shown in FIGS. 4 to 10, the front-rear length of the protection ring 59 is formed slightly longer than the front-rear length of the water stopping mechanism 58, and the front end thereof is formed in a tapered shape protruding longer toward the outer diameter side. Have been. Symbols 97, 98, 99, 10
Numeral 0 denotes a seal member, and most of the outer peripheral surface of the protective ring 59 between the seal members 97 and 98 is provided with a water stopping mechanism 5.
An annular recess 59 a having the same length as the front and rear lengths of the annular recess 91 of FIG. 8 and having a shallower depth than the annular recess 91 is formed. An annular recess 59b, which is slightly shorter than the front-rear length of the annular recess 59a, is formed in a large part of the inner peripheral surface of the protection ring 59 between the seal members 99 and 100.

During tunnel excavation, the protection ring 59 is in the closed position shown in FIG. 3 (that is, the water blocking mechanism 58 is closed), and the water blocking mechanism 58 is closed so that earth and sand do not flow into the annular concave portion 91. To protect.

Inside the front trunk 52, a plurality of retraction hydraulic cylinders 60 are provided at appropriate intervals in the circumferential direction and in the front-rear direction, and each rod 60a passes through the flange 52a to form the protection ring 59. It extends to the rear end and is connected. As shown in FIG. 5, when the protection ring 59 is retracted, the protection ring 59 is moved forward from the front end by about 10 kg / cm.
A plurality of (for example, four to six) injectant discharge tubes 61 for discharging the injectant having a pressure of about ² are provided, and an injectant supply source (not shown in the drawing) for supplying the injectant to each injectant discharge tube 61. ) Is also provided.

These injection agent discharge pipes 61 are provided, for example, at irregular intervals in the circumferential direction, and are particularly provided intensively around the lower part. Further, the plurality of injecting agent discharge tubes 61 are configured to also serve as the plurality of backing agent injecting tubes 102 (see FIG. 5), and these backing agent injecting tubes 102 are protected after water is stopped by the water stopping mechanism 58. This is for injecting the backing agent from the front end of the ring 59 toward the front, and one of an injecting agent supply source and a backing agent supply source for supplying the backing agent to the backing agent injection tube 102 can be selected. A direction switching valve (not shown) is also provided.

Next, the check valve of each injection agent discharge pipe 61 (and backing agent injection pipe 102) will be described. As shown in FIGS. 11 and 12, the distal end portion of each injecting agent discharge pipe 61 is slightly bent toward the shield axis, and the discharge holes at the distal ends are formed to have a slightly larger diameter. A disc-shaped boss 103 is internally fitted and welded to each of the discharge holes, and a seat pressing member 105 is accommodated in an accommodation hole 103a formed on the front surface of the boss 103 via a rubber elastic valve plate 104. It is connected to the boss 103 by a bolt. The boss 103 is formed with three communication holes 103b communicating the accommodation hole 103a and the injection liquid discharge pipe 61 at equal intervals. Elastic valve plate 10
4 in three directions 120 degrees apart from the approximate center.
There is formed a slit 104a formed by notching about two radial lengths. Reference numeral 104b indicates a through hole for four bolts. A tapered hole 105a is formed in the sheet holding member 105 so that the diameter increases toward the front side. When the injection agent or the backing agent is supplied, the slit 104a is elastically deformed toward the tapered hole 105a by the pressure of the injection agent or the backing agent. Alternatively, a backing agent passage is opened.

Next, the operation of the underground junction type shield machine described above will be described. However, the following description includes the description of the underground joining method. Shield machine 1A
When the shield excavator 1B and the shield excavator 1B are excavated in the phase approaching direction and the front ends thereof are joined to each other in the ground, the cutter disks 2 and 50 of both the shield excavators 1A and 1B are brought closer to the facing state. The excavation was stopped, and both shield excavators 1A,
The diameter of the movable cutter spokes 12b and 65b of 1B is reduced to form a gap for penetrating ring passage. During the tunnel excavation, the movable cutter spokes 12b and 65b are located at the diameter increasing positions.

Next, as shown in FIG. 4, while a plurality of fixed push rods 41a are each screwed with a short push rod 41 of a predetermined length in sequence, a plurality of push jacks 40 are used to push the push rod 41. By repeatedly pushing the rear end, the penetrating ring 10 on the shield excavator 1A side is pushed through the gap for passing through both penetrating rings to the vicinity of the cutter disk 50 on the shield excavator 1B side.

Next, as shown in FIG. 5, the protective ring 59 is ejected from each of the injecting agent discharge pipes 61 at a pressure of, for example, about 10 kg / cm ^2, and the protection ring 59 is moved by the hydraulic cylinder 60 for backward drive. 5 (that is, the water stop mechanism 58)
To the open position). Next, as shown in FIGS. 6 and 7, the penetration ring 10 is further pushed out and driven to supply pressurized water from a pressurized water supply source into the annular concave portion 91 of the water stopping mechanism 58 so that the annular elastic membrane member 92 faces inward. After expansion, the annular seal member 93 is pressed against the penetration ring 10 to stop water. Therefore, when the protection ring 59 is retracted, gravel or the like between the vicinity of the front end of the front trunk 52 of the shield machine 1B and the inner trunk 71 can be eliminated by the injection agent, and the inner peripheral surface of the annular seal member of the water stopping mechanism 58. (Seat surface) does not bite with earth and sand, gravel, etc., and the water stopping performance is significantly improved.

Next, as shown in FIG.
A backing agent such as mortar is injected from 0a to further stop water around the water stopping mechanism 58. If the water stoppage is insufficient, as shown in FIG. 9, a backing agent supply source is selected by a directional switching valve, and the backing agent is injected from the backing agent injection pipe 102 to stop the water stopping. . Thereafter, as shown in FIG.
1 is discharged from the mud pipe 57b to the outside, and the penetration ring 10 and the shield machine 1B are discharged from the chamber 51.
Ring 1 divided into a plurality of parts in the circumferential direction
06 (corresponding to a sealing member) is welded to stop water. Thereafter, the internal structural materials and accessories of the shield excavators 1A and 1B are removed, and the tunnels Ta and Tb are joined.

According to the underground joint type shield excavator described above, a plurality of backing agent injection pipes for injecting the backing agent from the front end of the protection ring 59 toward the front after water is stopped by the water stopping mechanism 58. 102, each backing agent injection tube 102
Therefore, a backing agent such as mortar can be injected into the entire periphery of the water stopping mechanism 58 to stop the water, and the water stopping performance can be remarkably improved. Since each injecting agent discharge pipe 61 and each backing agent injecting pipe 102 are provided on the protective ring 59, there is no need to additionally provide a retreat drive mechanism for retreating them, and it is advantageous in terms of piping space. Becomes

The plurality of injecting agent discharge tubes 61 are configured to also serve as the plurality of backing agent injecting tubes 102, and one of the injecting agent supply source and the backing agent supply source can be selected by the direction switching valve. The piping space can be reduced, and the manufacturing cost can be significantly reduced. Since the backing agent injecting passage 10a for injecting the backing agent into the outer peripheral side of the penetrating ring 10 is formed inside the cylindrical wall of the penetrating ring 10, the backing agent injecting passage 10a is closed after water is stopped by the water stopping mechanism 58. A backing agent such as mortar can be injected into the periphery of the water stopping mechanism 58 to stop water.

Next, an underground junction type shield machine according to another embodiment will be described. However, the same members as those of the above-described embodiment are denoted by the same reference numerals, and the description will be appropriately omitted. Since the penetrating shield excavator 1C is substantially the same as described above, the description is omitted. However, as shown in FIGS. 14 to 19, the penetration ring 10 of the penetration side shield machine 1C is used.
A backing agent injection path is not formed inside the cylindrical wall of A. Therefore, the penetrating ring 10A is the penetrating ring 1 of the above-described embodiment.
It is formed thinner than zero.

As shown in FIGS. 13 to 19, the water stop mechanism 58A of the receiving shield excavator 1D has the same structure as the water stop mechanism 58, and is provided on the outer surface of the front end of the inner body 71. ing. Between the vicinity of the front end of the front trunk 52 and the inner trunk 71, a protection ring 59 substantially the same as in the above embodiment is provided to close and protect the outer peripheral surface side of the water stopping mechanism 58A. . Other structures are the same as those of the above embodiment.

The operation of the underground shield type shield machine described above will be described. However, the following description includes the description of the underground bonding method. When the shield excavator 1C and the shield excavator 1D are excavated in the phase approaching direction and their front ends are joined underground, as shown in FIG. 13, the cutters of the shield excavators 1C and 1D are used. The excavation is stopped by bringing the disks 2, 50 closer to the approaching and opposing state, and the movable cutter spokes 12 of both shield excavators 1C, 1D.
b, 65b are reduced in diameter to form a penetration ring passage gap.

Next, as shown in FIG. 14, by repeatedly pushing the rear end of the push rod 40 with a plurality of push-out jacks 39, the penetration ring 10A on the shield machine 1C side is pushed.
Penetrating through the gap for passing through both penetration rings 1D
Is driven to the vicinity of the cutter disk 50 on the side.
Next, as shown in FIG. 15, the protective ring 59 is retracted while the injection ring is discharged from each injection pipe 61 at a pressure of, for example, about 10 kg / cm ^2.
15 to retreat to the position shown in FIG. 15 (that is, the open position of the water stopping mechanism 58A).

Next, as shown in FIGS. 16 and 17, the penetration ring 10A is further pushed out and driven to supply pressurized water from a pressurized water supply source into the annular concave portion of the water stopping mechanism 58A, thereby causing the annular elastic membrane member 92 to move. It is expanded outward, and the annular seal member 93 is pressed against the penetration ring 10A to stop water. In particular, by bending the distal end of each injecting agent discharge pipe 61 toward the annular seal member 93, soil, gravel, etc. on the outer peripheral surface of the annular seal member 93 of the water stopping mechanism 58A can be reliably removed, and the annular seal Gravel and the like can be prevented from adhering to the outer peripheral surface of the member 93.

Next, as shown in FIG. 18, the backing agent supply source is selected by the direction switching valve, and the backing agent is injected from each backing agent injection pipe 102 to stop the peripheral portion of the water stopping mechanism 58A. Water.
Therefore, it is not necessary to previously form the backing agent injection path in the penetration ring 10A, and the penetration ring 10A can be made thinner, the weight of the shield machine 1C can be reduced, and the manufacturing cost can be reduced. Moreover, the structure of the penetration ring 10A can be simplified. Thereafter, as shown in FIG. 19, the muddy water in the chamber 51 is discharged to the outside from the drain pipe 57 b, and the water stop ring 106 is welded from the chamber 51 to the penetration ring 10 </ b> A and the inner body 71. I do. After that, the internal structural materials and accessories of both shield excavators 1C and 1D were removed,
The tunnels Ta and Tb are joined.

Next, a modified embodiment in which this embodiment is partially modified will be described. 1) Shield machine 1A, 1B
In some cases, only the backing agent injected from the backing agent injection passage 10a is used, and the backing agent is not supplied from each backing agent supply pipe 102. 2) Injectant discharge pipe 61 and backfill injection pipe 1
02 may be independently provided. 3) Injectant discharge pipe 61
(And backing agent injection pipe 102) is not limited to four to six, and may be provided at equal intervals in the circumferential direction. In addition, without departing from the spirit of the present invention, it is possible to implement the above-described embodiment with various modifications.

[0067]

According to the first aspect of the present invention, the protective ring is moved backward to the predetermined position by the retreat driving means while the injectate is discharged from each of the injectate discharge pipes. The earth and sand, gravel, etc. between the vicinity of the front end of the excavator's front trunk and the inner trunk can be removed by the injection agent, and the inner peripheral surface or outer peripheral surface (sheet surface) of the annular seal member of the water stopping means
Can prevent sediment, gravel, etc. from adhering to the ring.When the annular sealing member is pressed against the penetration ring, the inner or outer peripheral surface of the annular sealing member does not get caught in the inner or outer peripheral surface. Aqueous properties are significantly improved. Moreover, the annular seal member is not damaged or worn.

After the annular sealing member is pressed against the penetrating ring, for example, the backing agent is applied to the outer peripheral side of the penetrating ring via a backing agent injection passage inside the cylindrical wall of the penetrating ring since the water stopping performance is remarkably improved. And the sealing member is welded to the penetration ring and the inner shell of the second shield excavator to stop the water, so that the soil water pressure does not flow into the shield excavator violently, and the worker enters the inside. It is possible to safely remove internal devices and attached devices. Therefore, it is not necessary for a plurality of workers to discharge the soil water pressure by using a pump or the like, so that the cost and the construction period can be reduced.

[0069] Further, since equipped with multiple Urakomi injection tube for injecting Urakomi agent forward from the front end of the protection ring after stopping water by the water stop means, respectively mortar from each Urakomi injection tube And the like can be injected into the entire periphery of the water stopping means to stop the water, thereby significantly improving the water stopping performance. Since each backing agent injection pipe is provided on the protection ring, there is no need to additionally provide a retreat drive mechanism for retreating only the protection ring, which is advantageous in terms of piping space .

[0070] Also, it configured to alternate the tube, since one of infusate source and Urakomi agent supply source can be selected by the direction switching valve, greatly reducing the production cost is possible reduce the piping space Can be done . According to the second aspect of the present invention, after water is stopped by the water stopping means, a backing agent such as mortar can be injected into the peripheral portion of the water stopping means from the backing agent injection path to stop water. Further, after draining the muddy water in the chamber, the operator can safely weld the sealing member to the penetration ring and the inner body from inside the chamber to stop the water.
The other effects are the same as those of the first aspect .

According to the third aspect of the present invention, since the distal end of each injecting agent discharge pipe is bent toward the annular seal member, sediment and gravels on the outer peripheral surface (sheet surface) of the annular seal member of the water stopping means. And the like can be reliably eliminated, and the adhesion of earth and sand, gravel, and the like to the outer peripheral surface of the annular seal member can be prevented. Other claims
It has the same effect as 1 .

According to the fourth aspect of the present invention, in particular, in the second step, the protective ring is moved backward to a predetermined position while discharging the injection agent from the front end of the protective ring to the front. Sometimes the earth and sand, gravel, etc. between the front end portion of the front body of the second shield machine and the inner body can be eliminated by the injecting agent, and the inner or outer peripheral surface (sheet surface) of the annular seal member of the water stopping means can be removed. Adhesion of earth and sand, gravels, and the like can be prevented, and thereafter, in the third step, earth and sand, gravels, and the like do not bite into the inner peripheral surface or the outer peripheral surface of the annular seal member, and the water stopping performance is significantly improved. Moreover, the annular seal member is not damaged or worn. The other effects are basically the same as those of the first aspect.

[0073] Further, the Urakomi agent mortar injected into the outer peripheral side of the penetration ring via Urakomi injection passage of the internal cylindrical wall of the penetration ring in the fourth step, then, the waste sludge facility mud in the chamber Thus, in the fifth step, the worker can safely weld the sealing member to the penetration ring and the inner shell of the second shield machine from inside the chamber to stop the water .

According to the fifth aspect of the present invention, it is possible to further improve the water stopping performance at the peripheral portion of the water stopping means, and to safely weld the sealing member from inside the chamber to stop the water. The other effects are the same as those of the fourth aspect . According to the invention of claim 6 , since the backing agent injection path of the penetration ring can be omitted, the penetration ring can be thinned, the weight of the first shield machine can be reduced, and the manufacturing cost can be reduced. Moreover, the structure of the penetration ring can be simplified. The other effects are the same as those in paragraph 0072 .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a penetration-side shield excavator of an underground junction type shield excavator according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view of a receiving shield excavator.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is an explanatory diagram showing a preparation stage before the retreat movement of the protection ring, and showing a positional relationship between the protection ring and the water stopping mechanism, and the like.

FIG. 5 is an explanatory diagram of a state in which a protective ring is moved backward to a predetermined position while discharging an injection.

FIG. 6 is an operation explanatory diagram in a state where a water stop mechanism is operated.

FIG. 7 is an enlarged view of a main part of FIG. 6;

FIG. 8 is a diagram corresponding to FIG. 7 in a state in which a backing agent is injected into the outer peripheral side of the penetration ring.

FIG. 9 is an explanatory view of a state in which a backing agent is injected from a backing agent injection tube.

FIG. 10 shows an underground joint completed state, in which a penetration ring and a second
It is an explanatory view of the stage where the sealing member was welded to the inner trunk of the shield machine and the water was stopped.

FIG. 11 is an enlarged cross-sectional view for explaining a check valve function at the distal end portion of the injection agent discharge pipe and the backing agent injection pipe.

12 (a) is a front view of the elastic valve plate, FIG. 12 (b) is a longitudinal sectional side view of the elastic valve plate, and FIG. 12 (c) is a longitudinal sectional side view of the elastic valve plate. It is a principal part enlarged view.

FIG. 13 is a longitudinal sectional side view of a main part of a receiving side shield machine according to another embodiment in a normal excavation state.

FIG. 14 shows a preparation stage before the retreat movement of the protection ring,
It is explanatory drawing which shows the positional relationship etc. of a protection ring and a water stop mechanism.

FIG. 15 is an explanatory diagram of a state in which the protective ring is moved backward to a predetermined position while discharging the injection material.

FIG. 16 is an operation explanatory view in a state where the water stop mechanism is operated.

FIG. 17 is an enlarged view of a main part of FIG. 16;

FIG. 18 is an explanatory view of a state in which a backing agent is injected from a backing agent injection tube.

FIG. 19 shows the underground joining completed state, in which the penetration ring and the second
It is an explanatory view of the stage where the sealing member was welded to the inner trunk of the shield machine and the water was stopped.

[Explanation of symbols]

 1A, 1C 1st shield excavator 1B, 1D 2nd shield excavator 2,50 Cutter disk 4,52 Front trunk 10,10A Penetration ring 10a Backing agent injection path 12,65 Cutter spoke 16,67 Hydraulic cylinder 39 Extrusion jack 58, 58A Water stopping mechanism 59 Protective ring 60 Hydraulic cylinder for retraction drive 61 Injectant discharge pipe 71 Inner body 93 Annular seal member 102 Backfill injection pipe

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shoji Okuwa 1-3-15 Awaza, Nishi-ku, Osaka-shi, Osaka Kashima Construction Co., Ltd. Kansai Branch (72) Inventor Zen-ichi Ishikawa 1-3-chome Awaza, Nishi-ku, Osaka-shi, Osaka No. 15 Kashima Construction Co., Ltd.Kansai Branch (72) Inventor Masahiro Kamio 1-3-15 Awaza, Nishi-ku, Osaka City, Osaka Prefecture Kashima Construction Co., Ltd.Kansai Branch (72) Inventor Mitsuo Shimizu Niijima, Harimacho, Kako-gun, Hyogo Prefecture No. 8 In the Harima Plant of Kawasaki Shige Kogyo Co., Ltd. (72) Inventor Saburo Morio 8 in Niijima, Harima-cho, Kako-gun, Hyogo Prefecture In Harima Plant of Kawasaki Shige Kogyo Co., Ltd. (56) References JP-A-11-303570 Patent Akira 63-22995 (JP, a) JP flat 11-193690 (JP, a) JitsuHiraku Akira 63-136088 (JP, U) (58 ) investigated the field (Int.Cl. ^7, D Name) E21D 9/06 301 E21D 9/06 302 E21D 9/08

Claims (6)

(57) [Claims] A first shield excavator; and a second shield excavator having a diameter equal to or greater than the diameter of the first shield excavator, wherein the first shield excavator has a tunnel shaft near an inside of a front body thereof. A cylindrical penetrating ring movably mounted in the direction of the center, pushing means for pushing the penetrating ring until it is partially inserted into the second shield machine, and a cutter disc for forming a passage gap of the penetrating ring. Undercut joining comprising: a spoke reducing means for reducing the diameter of the tip end of the cutter spoke in the radial direction; and making the first and second shield excavators excavate in the approaching direction to join the two underground. In the shield excavator of the type, the second shield excavator includes a spoke that radially reduces a tip portion or a radially middle portion of a cutter spoke of a cutter disc in order to form a passage gap of the penetration ring. Diameter means, water stopping means for stopping water through an annular seal member pressed against the outer peripheral surface or inner peripheral surface of the penetrating portion of the penetrating ring, and the vicinity of the front end of the front trunk of the second shield excavator and the inside thereof. A protection ring that is installed between the inner body and protects the inner peripheral surface or outer peripheral surface of the water stopping means by closing it, and the protection ring can be driven backward until the water stopping means changes from the closed state to the open state. and retraction drive means, Bei a plurality of infusate discharge pipe for discharging the infusate forward from the front end of the protection ring when retraction of the protective ring
For example, forward from the front end of the protection ring after stopping water by the water-stopping means
Equipped with multiple backing agent injection pipes for injecting backing agent
The plurality of injecting agent discharge tubes also serve as a plurality of backing agent injecting tubes.
To supply the infusate to the infusate discharge pipe.
Filler supply source and backing agent to supply backing agent to backing agent injection tube
A directional control valve that allows selection of either of the
Underground junction shield machine, characterized in that digit. 2. The water stopping means is provided on an inner peripheral portion near a front end of the front body and stops water through an annular seal member pressed against an outer peripheral surface of a penetrating portion of the penetrating ring. The underground joint type shield according to claim 1, wherein a backing agent injection path for injecting a backing agent into an outer peripheral side of the penetration ring is formed inside the cylindrical wall of the penetration ring. Excavator. 3. The water stopping means is provided on an outer peripheral portion near a front end of the inner body and stops water through an annular seal member pressed against an inner peripheral surface of a penetrating portion of the penetrating ring. configured, underground junction shield machine according to claim 1, the distal end portion of each infusate discharge pipe, characterized in that is bent toward the annular sealing member. 4. A first shield excavator and a second shield excavator having a diameter equal to or greater than the diameter of the first shield excavator are dug in a direction approaching each other, and their front ends are joined together in the ground. In the underground joining method, the first and second shield excavators are brought close to a state where both cutter disks approach and oppose to each other, and a tip end portion of a cutter spoke of the cutter disk of the first shield excavator is radially reduced in diameter. Forming a penetrating ring passage gap,
A first step of radially reducing a tip or a middle portion of a cutter spoke of a cutter disk of a shield excavator to form a gap for penetrating ring passage; To the front end of the front fuselage of the second shield machine and the inner shell inside thereof, and the injection agent is directed forward from the front end of the protective ring movably mounted in the axial direction of the tunnel. A second step of retreating the protective ring to a predetermined position while discharging water, further driving the penetration ring to press the annular seal member of the water stopping means against the outer peripheral surface or the inner peripheral surface of the penetration portion of the penetration ring. And a third step of penetrating through the backing agent injection passage inside the cylindrical wall of the penetration ring.
A fourth step of injecting a backing agent into the outer peripheral side of the ring, and a sealing portion between the penetrating ring and the inner shell of the second shield machine.
And a fifth step of welding and stopping water by welding the material . 5. The backing agent according to claim 4 , wherein the backing agent is injected from a backing agent injection pipe provided in the protection ring between the fourth step or between the fourth step and the fifth step. Underground joining method of underground joint type shield machine. 6. A first shield machine and the first seal
And a second shield machine with the same or larger diameter.
Drill in the approaching direction and join the front ends of the two underground
In the underground joining method, both cutter disks are connected to the first and second shield excavators.
Approach the opposing state, and move the first shield machine
The tip of the cutter spoke of the cutter disk in the radial direction
The diameter is reduced to form a penetration ring passage gap, and the second
Shield excavator cutter disc cutter spokes
Through the penetrating ring
A first step of forming an excess gap, and the penetration ring is connected to a cutter disc of a second shield machine.
The extruder is driven to the vicinity of the shield, and the front shell of the second shield machine
Between the vicinity of the front end of the
Forward from the front end of the protective ring, which can be moved in any direction
This protective ring is in place while discharging
A second step of retracting the penetrating ring, further driving the penetrating ring to drive the
An annular seal member of the water stopping means on the outer peripheral surface or inner peripheral surface of the part
A third step of pressing , after the third step, a step of injecting the backing agent forward from a backing agent injection pipe provided in the protection ring, and after this step, the penetration ring and the second underground joining method shield machine of the inner cylinder and the sealing member welded to stop water to in the land you <br/> characterized by comprising the step junction type shield machine.