JP3323178B2 - 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 junction method thereof, and more particularly, to a technique capable of shortening a length of a shield excavator on a penetration side by shortening a penetration ring.

[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 the 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 excavated from the separation point in the phase approaching direction, and finally two
Various technologies for joining the front ends of the shield excavators underground have been proposed and put to practical use.

[0004] The applicant of the present invention has disclosed Japanese Patent Application Laid-Open No. H11-193690.
In the gazette, the penetration ring of the penetration shield excavator is pushed forward to partially penetrate into the front end of the reception shield excavator, and the protection cylinder member of the reception shield excavator is retracted so that the inner surface of the water stopping mechanism is removed. Underground joint type shield equipped with a water-stop structure in which pressurized water is injected outside the water stop mechanism after the side is opened, and the annular seal member of the water stop mechanism is pressed against the outer peripheral surface of the penetration ring to stop water. An excavator was proposed.

[0005]

Problems to be Solved by the Invention
In the underground junction type shield machine described in Japanese Patent No. 93690, the penetration ring is penetrated to the vicinity of the partition wall, and the water is stopped by the water stopping mechanism at a substantially middle portion in the front-rear direction in the chamber of the receiving side shield machine. Must be increased in length. Therefore, the length of the ring receiving portion having an open front end for receiving the penetrating ring is increased. Because these penetrating rings and the ring housing become longer, the outer front body part and the inner inner body member of the ring housing also become longer, the weight of the penetrating shield excavator increases, and the manufacturing cost increases.
The length of the penetrating shield excavator becomes longer. As the captain becomes longer, not only does the advancing performance deteriorate, but also the shaft for inserting the shield machine must be enlarged.

[0006] Sediment and gravels accumulate on the inner surface of the front end of the front body of the receiving shield excavator, particularly around the bottom portion, and when the protective cylinder member retreats, the lands and gravel and the like are removed by the annular sealing member of the water stopping mechanism. Even if the annular seal member is pressed into contact with the penetration ring in this state, earth and sand, gravel, etc. bite into the inner peripheral surface of the annular seal member, and water cannot be reliably stopped.
The annular seal member is damaged or worn. If the water stoppage is insufficient or if the inner peripheral surface of the annular seal member is damaged or worn, the soil water pressure will violently flow into the shield machine, and after joining underground, the worker will go inside. Internal equipment and attached equipment cannot be removed. As described above, when troubles in water stoppage and drainage occur, the construction cost increases, and the construction period becomes longer.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the length of the penetrating ring of the penetrating shield excavator and shorten the machine length, to reduce the weight and the production cost, to ensure the advancing performance, And to improve the performance and prevent damage and abrasion of the sealing member for waterproofing.

[0008]

According to a first aspect of the present invention, there is provided an underground junction type shield excavator comprising: a first shield excavator; and a second shield excavator having a diameter equal to or greater than the diameter of the first shield excavator. The first shield excavator can be driven in the vicinity of the inside of the front fuselage in a cylindrical penetrating ring equipped so as to be movable in the axial direction of the tunnel and the penetrating ring can be pushed out until the penetrating ring is partially inserted into the second shield excavator. And a spoke reducing means for reducing the diameter of the tip of the cutter spoke of the cutter disk in the radial direction in order to form a passage gap for the penetrating ring. In the underground joint type shield excavator in which the two are joined underground by excavating, the second shield excavator includes a cutter of a cutter disc for forming a passage gap for introducing the penetration ring. Spoke diameter reducing means for radially reducing the diameter of the spoke tip or middle part in the radial direction, an inner trunk located inside the vicinity of the front end of the front fuselage of the second shield excavator, and a forward movable to the inner trunk And a ring seal member provided on the outer peripheral portion of the distal end portion of the water stopping ring and pressed against the inner peripheral surface of the penetrating ring portion penetrating into the second shield machine. A water stopping means for stopping water through the water blocking means, and a forward drive means for driving the water stopping ring forward.

The first and second shield excavators are excavated in the direction of approaching each other, and when joining underground, the cutter disks of both shield excavators are approached to face each other and the excavation is stopped. The spoke diameter reduction means of the excavator is reduced in diameter to form a passage gap for the penetrating ring, and the penetrating ring is extruded and driven by the extruding means to partially penetrate into the second shield excavator and advance the water stop ring. The driving means causes the second shield machine to move forward to the inside of the penetrating ring portion penetrated. Next, an injection or pressurized water is discharged from each injection material discharge pipe. In parallel with or after this step, the annular sealing member of the water stopping means is pressed against the inner surface of the penetration ring portion to stop water.

In particular, since the penetrating ring is partially penetrated into the second shield machine and the water stop ring is moved forward inside the penetrating ring portion penetrated into the second shield machine, both rings are moved from both sides. The annular seal member can be brought into close contact and partially wrapped to press the annular seal member for water stoppage. Therefore, the length of the penetrating ring can be made as small as possible, and the length of the cylindrical ring housing portion having an open front end for accommodating the penetrating ring can be made small. The outer front trunk portion and the inner inner trunk member can also be shortened (that is, the machine length can be shortened), so that the overall weight can be reduced and the production cost can be reduced. Since the PIC can be shortened, the advancing performance can be secured. Thereafter, as a secondary water stoppage, a backing agent such as mortar is injected forward from inside the vicinity of the front end of the front body of the second shield machine, for example.
Further, as a third water stop, for example, a sealing member or the like is welded to the penetration ring and the water stop ring to stop the water.

According to a second aspect of the present invention, there is provided an underground shield type shield machine.
The invention according to claim 1, further comprising a plurality of injectant discharge pipes for discharging injectant or pressurized water from inside the vicinity of the front end of the front body of the second shield machine to the front. Things. Therefore, earth and sand, gravels, and the like around the water stopping means can be removed with an injectant or pressurized water, and when the annular seal member is pressed against the penetration ring, there is a gap between the annular seal member and the penetration ring portion. Gravel and the like can be prevented from being bitten, and the water stopping performance is improved.

According to a third aspect of the present invention, there is provided an underground junction type shield machine.
The invention according to claim 1 or 2, further comprising a plurality of backing agent injection pipes for injecting the backing agent from inside the vicinity of the front end of the front trunk of the second shield machine to the front. It is assumed that. After the annular sealing member of the water stopping means is pressed against the penetration ring, a backing agent such as mortar is injected from each backing agent injection pipe to the periphery of the water stopping means, so that the water stopping performance is further improved.

According to a fourth aspect of the present invention, there is provided an underground junction type shield machine.
4. The invention according to claim 3, wherein the plurality of injecting agent discharge tubes are configured to also serve as a plurality of backing agent injecting tubes, and an injecting agent supply source for supplying the injecting agent to the injecting agent discharging tube; A directional switching valve is provided for selecting one of a backing agent supply source for supplying the backing agent to the pipe. Since the tube is also used and either the injectant supply source or the backing agent supply source can be selected by the direction switching valve, the piping space can be reduced and the production cost can be significantly reduced.

According to a fifth aspect of the present invention, there is provided an underground joining method for an underground joint type shield excavator, wherein 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 closely approached. 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 extruding and driving the penetrating ring to partially penetrate the second shield machine, and inside the front shell of the second shield machine. A second step of advancing the water ring to the inside of the penetrating ring part penetrating the second shield machine, and injecting or pressurized water from inside the front body of the second shield machine into the penetrating ring part. A third step of discharging water, and after or after the third step, an annular seal member of a water stopping mechanism provided on an outer peripheral portion of a distal end portion of the water stopping ring is attached to the penetration ring portion. And a fourth step of pressing against the inner surface.

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 the distal end or the middle of the cutter spoke of the second shield machine is reduced in the radial direction to form a gap for passing through the penetrating ring. To partially penetrate into the second shield machine, and move the water stop ring forward to the inside of the penetrating ring portion. In particular, in the second step, both rings can be approached from both sides and partially wrapped, and in the following fourth step, the annular seal member can be pressed and used to stop water, so that the length of the penetrating ring is minimized. It can be formed small, and the length of the ring housing portion for housing the penetration ring can also be made small. Since the lengths of the penetrating ring and the ring housing portion can be reduced, the front body portion outside the ring housing portion and the inner body member inside the ring housing portion can also be shortened, so that the overall weight can be reduced and the manufacturing cost can be reduced. Since the PIC can be shortened, the advancing performance can be secured. In addition, the same operation as the first aspect is basically achieved.

According to a sixth aspect of the present invention, in the underground joining method of the underground joint type shield excavator according to the fifth aspect of the present invention, after the fourth step, from the inside of the vicinity of the front end of the front trunk of the second shield excavator. A fifth step of injecting a backing agent toward the front and a sixth step of welding a sealing member to the penetration ring and the water stopping ring to stop water are provided. Fifth
In the process, the back water is further injected by injecting a backing agent into the periphery of the water stopping means after the annular seal member is pressed against the penetration ring to further improve the water stopping performance. Thereafter, the muddy water in the chamber is discharged by a mud discharging facility or the like, and the sealing member is welded from the inside of the chamber to the penetration ring and the water stop ring in the sixth step to stop the water, so that the water stoppage is remarkably improved. After that, the internal structural materials and accessories of both shield excavators can be safely removed.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. This underground joint type shield excavator is configured such that two shield excavators are excavated in a phase approaching direction to join the two 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 will be referred to as forward, and the left and right will be referred to as 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, and an engaging portion 14a is formed on the outer peripheral ring 14 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 driving mechanism 5 will be described. A ring gear 26 is fixed to the rear end of the connecting frame 17, and a plurality of cutter driving motors 27 are provided behind the annular concave portion 21 a 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 includes 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 is composed of 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 FIG. 1, near the inside of the front half of the front body 4, the front body 4, the cylindrical member 37, and the annular closing plate 37 a
With this, a cylindrical ring housing portion 38 having an open front end is formed,
A cylindrical penetration ring 10 is disposed concentrically with the front body 4 in the ring accommodation section 38, and the penetration ring 10 is provided so as to be movable in the ring accommodation section 38 forward in the axial direction of the tunnel. The inner and outer surfaces of the penetrating ring 10 are sealed by the sealed ring member on the inner surface at the front end of the cylindrical member 37 and the sealed ring member on the inner surface near the front end of the front body 4 so that earth and sand do not flow into the ring housing 38. Has become.

A plurality of pushing jacks 39 (corresponding to pushing means) for pushing the penetration ring 10 until it partially penetrates into the second shield machine 1B are provided near the inner periphery of the rear portion of the front barrel 4. Is provided. 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 the penetration ring 10 is pushed out by the pushing jacks 39, the push rods 40a are attached to the respective fixed push rods 40a.
While pushing in successively, a plurality of extrusion jacks 3
9 drives the penetrating ring 10 out.

Next, the receiving shield excavator 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 driving mechanism 53 that rotationally drives the cutter disk 50, 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 sludge exhaust device 57 for discharging the excavated earth and sand, and a portion near the front end of the front trunk 52. An inner body 58 located on the inside, a water stopping ring 59 externally fitted to the inner body 58 so as to be able to move forward, and a water stopping ring 59
And a hydraulic cylinder 61 (corresponding to forward driving means) for driving the water stopping ring 59 forward, and the like. I have.

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 body 52, a plurality of extendable cutter spokes 65 extending in the radial direction 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 includes 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 and 7, the front trunk 52 has the same diameter as the front trunk 4 of the penetrating shield excavator 1A.
, An inner body 58 is joined in parallel to the inside of the vicinity of the front end thereof via a box frame 71 and a predetermined gap.
That is, the inner trunk 58 is disposed so that the tip of the inner trunk 58 is located at a position slightly retreated from the tip of the front trunk 52,
8 has a flange 52 a of the front body 52 and a support wall 72.
The L-shaped frame 73 is welded to a substantially middle portion of the inner body 58 in the length direction. In addition, inner trunk 5
A reinforcing member 74 is joined obliquely over the distal end portion of the frame 8 and the L-shaped frame 73.

Next, the water stopping ring 59 and the water stopping mechanism 60 will be described. As shown in FIGS. 3 to 6 and FIG.
A water stopping ring 59 is fitted on the inner body 58 so as to be movable forward from the position shown in FIG. 4 to the position shown in FIG. A water stopping mechanism 60 for stopping water through an annular seal member 75 pressed against the inner peripheral surface of the penetrating ring portion penetrating into the second shield machine 1B at the outer peripheral portion of the distal end portion of the water stopping ring 59. Is provided. A plurality of forward drive hydraulic cylinders 61 are provided inside the front trunk 52 at appropriate intervals in the circumferential direction and in the front-rear direction, and the rods 61 a of the hydraulic cylinders 61 penetrate through the flange portions 52 a of the front trunk 52. The ring 59 extends to the rear end of the water stop ring 59 and is connected thereto. Reference numerals 76 to 79 indicate seal members.

The water stopping mechanism 60 is a well-known water stopping mechanism. The water stopping mechanism 60 includes an annular concave portion 80 formed on the inner surface of the front end of the water stopping ring 59, an annular elastic film member 81, and an annular sealing member 7.
5 and a pressurized water injection mechanism including a pressurized water injection pipe.
A flexible annular elastic film member 81 is provided in the annular concave portion 80, and a front end portion of the annular elastic film member 81 is an annular stopper 8.
The rear end of the annular elastic membrane member 81 is fixed to the water stopping ring 59 with an annular stopper 83 and a bolt. An annular seal member 75 is provided outside the annular elastic membrane member 81, and a front end of the annular seal member 75 is fixed by a stopper 82. The annular seal member 75 is composed of a large number of thin elastically deformable elastic plates having a predetermined small width in the circumferential direction, and a large number of elastic plates arranged while being partially wrapped in the circumferential direction. It has a structure wrapped in a resin material.

The cone plate portion 71a at the front end of the box frame 71 is formed in a tapered shape protruding forward toward the outer diameter side, and the front end of the water stopping ring 59 is also substantially in the tapered surface of the cone plate portion 71a. It is formed obliquely in one shape. A plurality (for example, four to six) of injecting agent discharge pipes 84 for discharging an injecting agent (viscous muddy water) or pressurized water from the cone plate portion 71a toward the front are provided inside the front body 52. An injecting agent supply source (not shown) for supplying an injecting agent or pressurized water to each injecting agent discharge pipe 84 is also provided.

These injection agent discharge pipes 84 are provided at, for example, unequal intervals in the circumferential direction, and particularly at small intervals in the vicinity of the lower part. The plurality of injecting agent discharge tubes 84 are configured to also serve as the plurality of backing agent injecting tubes 85, and these backing agent injecting tubes 85 are directed forward from the cone plate portion 71 a after water is stopped by the water stopping mechanism 60. A direction switching valve (not shown in the drawings) that allows the user to select one of an injecting agent supply source and a backing agent supply source that supplies the backing agent to the backing agent injection pipe 85. ) Is also provided.

Next, the check valve at the tip of each injection agent discharge pipe 84 (backing agent injection pipe 85) will be described. As shown in FIGS. 4 to 6, the distal end portion of each injecting agent discharge pipe 84 is slightly bent toward the shield axis, and the cone plate portion 71 a
To a disk-shaped boss 86 which is internally welded to the boss 86. A seat holding member 88 is accommodated in an accommodation hole 86a formed in the front portion of the boss 86 via a rubber elastic valve plate 87, and is connected to the boss 86 by four bolts.

The boss 86 is formed with three communication holes 86b communicating the accommodation hole 86a and the injecting agent discharge pipe 84 at regular intervals. The elastic valve plate 87 has a slit 8 having a radius of about 1/2 in three directions at intervals of 120 degrees from a substantially central portion thereof.
7a are formed. Reference numeral 87b indicates a through hole for four bolts. A taper hole 88a is formed in the sheet holding member 88, the diameter of which increases toward the front side. When the injection agent (or pressurized water) or the backing agent is supplied, the slit 87a is elastically deformed toward the taper hole 88a by the pressure thereof. To open the passage for the infusion (or pressurized water) or backing agent.

As shown in FIG. 2, inside the inner body 58,
A partition 89 substantially similar to that of the penetrating-side shield machine 1A is provided, and annular webs 90, 91 and the like are provided on the inner surface of the front trunk 52. Cutter disk 50 and partition 89 and L
The chamber 51 is formed between the mold frame 73 and the annular recess 89 a is formed in the partition wall 89. On the back side of the cutter disk 50, a cutter disk 5 is provided.
An annular connecting frame 92 for supporting the O.
The connecting frame 92 is inserted into an annular concave portion 89a of the partition wall 89 and is rotatably supported in a liquid-tight manner. At the center of the partition wall 89, the hydraulic cylinder 6 of the cutter disk 50 is provided.
A swivel joint 93 for supplying hydraulic pressure from a hydraulic pressure supply source to 7, 69 is supported.

The cutter rotation drive mechanism 53 will be described. A ring gear 94 is fixed to the rear end of the connection frame 92, and a plurality of cutter drive motors 95 are fixed to the rear side of the annular recess 89a. The pinion at the tip of the output shaft meshes with the ring gear 94 and the cutter drive motor 95 causes the cutter disk 5
0 is driven 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 96 are fixed inside the front end of the rear trunk 54. A plurality of tail seals 97 are provided to prevent earth and sand from flowing into the inside of the shield machine 1B. A rear work deck 98 is provided inside the rear trunk 54, and the rear work deck 98 is provided with a perfect circle holding device 99 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 part of the front trunk 52, and the jack body of each shield jack 55 has an annular web 91.
, And the front end of each jack body is received by an annular web 90. A spreader 101 is pin-connected to the tip of the piston rod of each shield jack 55 via an eccentric fitting 100.
The piston rod is extended, and the spreader 101 is brought into contact with the front end of the segment S covered on the inner surface of the tunnel Tb and pressed, whereby a digging thrust is generated.

The erector device 56 will be described. The erector device 56 includes a rotary drum 102, an erector body 103, and an electric or hydraulic drive motor (not shown) for driving the rotary drum 102 to rotate. A support roller 104 is rotatably supported by each bracket 96,
The rotating drum 102 is rotatably supported by a plurality of support rollers 104. Each time one ring is excavated in the tunnel Tb, the segment S is assembled by the erector device 56 over the entire circumference of the tunnel shaft wall for 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, 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 of the two are joined in the ground, as shown in FIGS. 7 and 8, the cutter disks of the shield excavators 1A and 1B are used. The excavation is stopped by bringing the two and 50 closer to the approaching and facing state, and the movable cutter spokes 12b and 65b of both shield excavators 1A and 1B are reduced in diameter 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. 9, a plurality of push jacks 39 are used to push the push rods 40 with a plurality of push jacks 39 while screwing the push rods 40 of a predetermined short length to each of the plurality of fixed push rods 40a. By repeatedly pushing the rear end, the penetration ring 10 on the shield excavator 1A side is pushed through the gap for passing through both penetration rings to the vicinity of the cone plate portion 71a at the tip end of the box frame 71 on the shield excavator 1B side. While driving, the water stopping ring 59 is moved forward to the inside of the penetrating ring portion penetrating the second shield machine 1B. That is, the distal end of the water stopping ring 59 is moved forward to the vicinity of the distal end of the outer ring 64.

Next, as shown in FIG. 10, the injection is discharged from each injection discharge pipe 84 at a pressure of, for example, about 10 kg / cm ² . In parallel with or after this step, pressurized water is supplied from a pressurized water supply source into the annular concave portion 80 of the water stopping mechanism 60 to expand the annular elastic membrane member 81 outward, and to connect the annular seal member 75 to the penetration ring 10. Press against the inner surface of the to stop the water. Therefore, it is possible to prevent earth and sand, gravels, and the like from adhering to the outer peripheral surface of the annular seal member 75, and when the annular seal member 75 is pressed against the penetration ring 10, the outer peripheral surface of the annular seal member 75 is crushed. And the like are not bitten, and the water stopping performance is improved. Next, as shown in FIGS. 11 and 12, a backing agent such as mortar is injected from each backing agent injection pipe 85 to further stop water around the water stopping mechanism 60.

Thereafter, as shown in FIG. 13, the muddy water in the chamber 51 is discharged to the outside from the mud pipe 57b, and the penetration ring 10 and the water stopping ring 59 are discharged from the chamber 51.
At this time, the water blocking ring 105 (corresponding to a sealing member) divided into a plurality in the circumferential direction 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 shield type shield machine described above, the penetration ring 10 partially penetrates into the receiving side shield machine 1B, and the water stopping ring 59 penetrates into the receiving side shield machine 1B. Since the ring is moved forward to the inside of the penetrated ring portion, the two rings 10, 59 can be approached from both sides and partially wrapped, and the annular seal member 75 can be pressed against the water to stop the water. Therefore, the length of the penetrating ring 10 can be made as small as possible, and the length of the cylindrical ring accommodating portion 38 for accommodating the penetrating ring 10 can be made small. The part and the inner cylindrical member 37 can also be shortened. Therefore, the length of the penetrating shield excavator 1A can be shortened, the overall weight can be reduced, and the manufacturing cost can be reduced. Since the captain can be shortened, the turning performance can be secured, and the shaft for inserting the shield excavator can be reduced.

Since a plurality of injecting agent discharge pipes 84 for discharging injecting agent or pressurized water from the inside near the front end of the front body 52 of the receiving-side shield excavator 1B are provided, the vicinity of the water stopping mechanism 60 is provided. Can be removed with an injectant or pressurized water, and when the annular seal member 75 is pressed against the penetrating ring 10, the sediment, gravel, etc. bite between the annular seal member 75 and the penetrating ring 10. Can be prevented
Water stoppage is improved.

Since a plurality of backing agent injection pipes 85 for injecting the backing agent from the inside near the front end of the front body 52 toward the front are provided, the annular sealing member 75 of the water stopping mechanism 60 is inserted through the ring. After the contact with the base material 10, a backing agent such as mortar is injected into each peripheral portion of the water stopping mechanism 60 from each backing agent injection pipe 85, so that the water stopping performance is further improved. A plurality of injection agent discharge pipes 84
Is configured to also serve as a plurality of backing agent injection pipes 85, and either the injecting agent supply source or the backing agent supply source can be selected by a directional switching valve, so that the piping space can be reduced and the production cost is significantly reduced. Can be reduced. After the backing agent is injected from the plurality of backing agent injection pipes 85, the water stop ring 105 is welded to the penetration ring 10 and the water stop ring 59 to stop the water, so that the water stoppage is significantly improved. Therefore, it is possible to safely remove the internal structural materials and accessories of the shield excavators 1A and 1B.

Next, a modified embodiment in which the present embodiment is partially modified will be described. 1) In the present embodiment, the injection is discharged from each injection discharge pipe 84, but pressurized water may be discharged.
Before the forward movement of the water stopping ring 59, each injecting agent discharge pipe 84
, Or an injection or pressurized water may be discharged. The injection is not limited to viscous muddy water. 2) The injection agent discharge pipe 84 and the backfill injection pipe 85 may be provided independently. 3) The injecting agent discharge pipe 84 (and the backing agent injecting pipe 85)
The number is not limited to four to six, and may be provided at equal intervals in the circumferential direction. Of course, a plurality of infusate discharge pipes 84
In order to remove sediment, gravel, and the like, which are particularly deposited around the lower part, it is preferable to provide a small space around the lower part. In addition, without departing from the spirit of the present invention, it is possible to implement the above-described embodiment with various modifications.

[0054]

According to the first aspect of the present invention, in particular, the penetration ring partially penetrates into the second shield machine, and the water stop ring penetrates into the second shield machine. Since the ring is moved forward, the two rings can be approached from both sides and partially wrapped so that the annular seal member is brought into pressure contact with the ring to provide water stoppage. Therefore,
The length of the penetrating ring can be made as small as possible, and the length of the ring accommodating portion and the like for accommodating the penetrating ring can also be made small. The body member can also be shortened. Therefore, the length of the first shield machine can be shortened. Since the overall length can be shortened, the weight can be reduced and the production cost can be reduced. Since the length of the first shield excavator can be shortened, the turning performance can be secured, and the shaft for inserting the shield excavator can be reduced.

According to the second aspect of the present invention, earth and sand, gravel, and the like around the water stopping means can be removed with an injecting agent or pressurized water. It is possible to prevent earth and sand, gravels, and the like from being caught in the gap with the penetration ring, and the water stopping performance is improved. In addition, damage and wear of the annular seal member can be prevented, and the durability of the annular seal member is improved. The other effects are the same as those of the first aspect.

According to the third aspect of the present invention, a plurality of backing agent injection pipes are provided for injecting the backing agent from the inside near the front end of the front body of the second shield machine to the front. After the annular sealing member of the water stopping means is pressed against the penetration ring, a backing agent such as mortar is injected into each peripheral part of the water stopping means from each backing agent injection pipe, so that the water stopping performance is further improved. The other effects are the same as those of the first or second aspect. According to the invention of claim 4, the plurality of injecting agent discharge tubes are configured to also serve as the plurality of backing agent injecting tubes, and one of the injecting agent supply source and the backing agent supply source is controlled by the direction switching valve. Since the piping space can be selected, the piping space can be reduced, and the manufacturing cost can be significantly reduced. The other effects are the same as those of the third aspect.

According to the fifth aspect of the present invention, in particular, in the second step, the two rings are approached from both sides and partially wrapped, and in the following fourth step, the annular seal member is pressed into contact with water to stop water. Therefore, the length of the penetrating ring can be made as small as possible, and the length of the ring accommodating portion for accommodating the penetrating ring before underground joining can also be made small. Therefore, the front body portion outside the ring housing portion and the inner body member inside the ring housing portion can also be shortened, so that the overall weight can be reduced and the manufacturing cost can be reduced. The other effects are basically the same as those of the first aspect.

According to the sixth aspect of the present invention, after the backing agent is injected from the plurality of backing agent injection pipes, the sealing member is welded to the penetration ring and the water stopping ring to stop the water. Is significantly improved. Therefore, it is possible to safely remove the internal structural materials and attached devices of the shield excavators. There is no need for a plurality of workers to discharge the soil water pressure with a pump or the like, so that the cost for that can be reduced and the construction period can be shortened. The other effects are the same as those of the fifth aspect.

[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-side shield machine.

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

FIG. 4 is an enlarged sectional view of a water stopping mechanism, a water stopping ring, and the like before underground joining.

FIG. 5 is an enlarged cross-sectional view of a check valve at a distal end portion of an injection agent discharge pipe and a backing agent injection pipe.

6 (a) is a front view of the elastic valve plate, FIG. 6 (b) is a longitudinal sectional side view of the elastic valve plate, and FIG. 6 (c) is a longitudinal sectional side view of the elastic valve plate. It is a principal part enlarged view.

FIG. 7 is an explanatory diagram of a state in which both shield excavators are stopped close to a state of approaching and facing each other.

FIG. 8 is an operation explanatory view at a stage when a penetration ring passage gap is formed.

FIG. 9 is an operation explanatory view at the stage when the penetration ring and the water stopping ring are moved forward.

FIG. 10 is an explanatory view showing a state where the annular seal member is pressed against the penetration ring.

FIG. 11 is an explanatory diagram of a state in which the periphery of the water stop mechanism is further stopped.

FIG. 12 is an enlarged view of a main part of FIG. 11;

FIG. 13 is a view showing a state where the underground joining is completed, and is an explanatory view of a stage in which the sealing member is welded to the penetration ring and the water stopping ring of the receiving-side shield excavator to stop water.

[Explanation of symbols]

 1A Penetration-side shield excavator 1B Receiving-side shield excavator 2,50 Cutter disk 4,52 Front trunk 10 Penetration ring 12,65 Cutter spoke 16,67 Hydraulic cylinder 39 Extrusion jack 58 Inner trunk 59 Water stopping ring 60 Water stopping mechanism 61 Hydraulic Cylinder 75 Annular Seal Member 84 Injectant Discharge Tube 85 Backfill Injection Tube 105 Water Stop Ring

──────────────────────────────────────────────────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-shi, Osaka Kashima Construction Co., Ltd.Kansai Branch (72) Inventor Mitsuo Shimizu Niijima, Harima-cho, 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 1-295993 (JP, A) JP-A-2-311689 (JP, A) JP-A-11-229758 (JP, A) JP-A-53-108634 (JP, A) JP-A-62-258093 (JP, A) JP-A-11-193690 (JP, A) JP-A-63-22995 (JP, A) JP-A-6-57990 (JP, U) JP-A-63-136088 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB 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 larger 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 second direction, extruding means capable of driving the penetrating ring until the penetrating ring is partially inserted into the second shield machine, and a cutter disk 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 type shield excavator, the second shield excavator is configured to reduce a diameter of a leading end portion or a radial middle portion of a cutter spoke of a cutter disk in a radial direction to form a passage gap for introducing the penetration ring. Diameter reduction means, an inner trunk located inside the vicinity of the front end of the front trunk of the second shield excavator, a water-stop ring externally fitted to the inner trunk so as to be able to move forward, A water stopping means mounted on an outer peripheral portion of a distal end portion of the ring and stopping water through an annular seal member pressed against an inner peripheral surface of a penetrating ring portion penetrated into the second shield machine; And a forward drive means for forward driving the ground. 2. A plurality of injecting agent discharge pipes for discharging an injecting agent or pressurized water from inside a portion near a front end of a front body of the second shield excavator to the front. 2. The underground junction type shield machine according to 1. 3. A plurality of backing agent injection pipes for injecting a backing agent from the inside near the front end of the front body of the second shield excavator forward. 3. The underground junction type shield machine according to 1 or 2. 4. An injectant supply source for supplying an injectant to the injectant discharge tube, wherein the plurality of injectant discharge tubes are configured to also serve as a plurality of backing agent injection tubes. The underground joint type shield excavator according to claim 3, further comprising a direction switching valve for selecting one of a backing agent supply source for supplying the backing agent. 5. 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 end or a middle part of a cutter spoke of a cutter disc of a shield excavator to form a gap for penetrating a ring, and extruding and driving the penetrating ring into a second shield excavator. A second step of partially penetrating and advancing a water stop ring inside a front shell of the second shield machine to an inside of a penetrating ring portion penetrating the second shield machine; A third step of discharging an injectant or pressurized water from the inside of the front trunk of the excavator to the inside of the penetrating ring portion; and in parallel with or after the third step, the tip of the water stopping ring A fourth step of pressing an annular seal member of a water stop mechanism provided on an outer peripheral portion to an inner surface of the penetrating ring portion, the underground joining type shield excavator having an underground joining method. 6. After the fourth step, a fifth step of injecting a backing agent from the inside near the front end of the front body of the second shield machine to the front, and the penetrating ring and the water stopping ring. A step of welding the sealing member to stop water.
The underground joining method of the underground joining type shield machine described in (1).