JP3347311B2 - Underground junction type shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates also relates to underground junction shield machine, to simplified technology the internal structure of the shield machine in particular improved water stopping structure of underground junction.

[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 techniques for joining the front ends of two shield excavators underground have been proposed and put into practical use (Japanese Patent No. 2512257).
JP-A-8-158783, JP-A-11-158
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.

[0004] The underground shield type excavator disclosed in Japanese Patent No. 251257 is provided with a receiving side shield excavating machine and a penetrating side shield excavating machine. The receiving side shield excavating machine includes a trunk member and a tunnel shaft center attached to the trunk member. A shield body equipped to be relatively movable in the direction, and a relative moving means thereof,
A tube seal that can be expanded by pressurized water or pressurized air is provided on the inner peripheral portion of the tip of the body member, and an inner peripheral ring is provided on the shield body to protect the tube seal during normal excavation. . The cutter disk of the penetrating shield excavator is formed longer in the direction of the tunnel axis so as to protrude from the front end of the trunk member, and a sand seal is provided on the inner peripheral portion at the tip end of the trunk member.

At the time of underground joining, the tip of the cutter spoke of the cutter disk of the receiving shield excavator is reduced in diameter in the radial direction, and the shield body and the inner peripheral ring are retracted by the relative moving means, so that the penetration shield excavation is performed. Form the insertion part of the cutter disk of the machine and open the tube seal. In the penetrating shield excavator, the distal end of the cutter spoke of the cutter disk is radially reduced in diameter, and then the cutter disk is inserted into the trunk member of the receiving shield excavator, and the tips of both trunk members abut each other. Push the shield excavator to the extruded side until it is driven. Next, the tube seal is expanded to seal between the trunk member of the receiving shield excavator and the outer ring portion of the cutter disk of the penetrating shield excavator.

[0006] In the underground joint type shield excavator disclosed in Japanese Patent Application Laid-Open No. 8-158783, a tube seal is disposed on the outer peripheral portion of the tip of the trunk member of the penetrating side shield excavator. In general, a protection cylinder member for protecting a tube seal is provided during excavation, and a hydraulic cylinder capable of driving the protection cylinder member backward during underground joining is provided. Other relative moving means of the receiving-side shield machine have substantially the same configuration as that of Japanese Patent No. 2512257.

[0007] Japanese Unexamined Patent Application Publication No. 11-193690 discloses a technique of joining two shield excavators of the same diameter underground via a penetrating ring. That is, 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 to remove the inner surface of the water stopping mechanism. After being opened, pressurized water is injected to the outside of the water stopping mechanism, and the annular seal member of the water stopping mechanism is pressed against the outer peripheral surface of the penetration ring to stop the water, and the underground joint type shield excavator having a water stopping structure. Has been proposed.

[0008]

[Problems to be Solved by the Invention] Patent No. 251225
No. 7, Japanese Patent Application Laid-Open No. 8-158783 discloses an underground junction type shield excavator in which a shield body must be equipped so as to be relatively movable with respect to a trunk member by a relative moving means including a plurality of hydraulic jacks and slide mechanisms. Must be
The structure becomes complicated and the production cost increases. Moreover, it is necessary to seal the sliding gap between the trunk member and the shield body so that earth and sand do not enter the sliding gap. As described above, the internal structure is complicated and the number of parts is increased, so that the length of the shield machine is also increased. Therefore, the diameter of the shaft for introducing the shield machine into the shield shaft must be increased, and the construction cost is also increased.

In the underground junction type shield machine described in Japanese Patent Application Laid-Open No. 11-193690, a protection cylinder member for protecting the water stopping mechanism during normal excavation and a plurality of hydraulic cylinders capable of driving the protection cylinder member backward must be provided. . In addition, since the protective cylinder member is provided so as to penetrate the partition wall, a sealing member or the like for ensuring the sealing property between the protective cylinder member and the partition wall is required, and the manufacturing cost is increased. In addition, since the protection cylinder member is a steel ring having a thickness of about 30 to 40 mm, for example,
The larger the diameter of the tunnel, the more expensive it is to manufacture.

[0010] The applicant of the present application also provides an underground joint type shield excavator in which an inner trunk is provided in advance on the inner surface side of the trunk member of the receiving-side shield excavator, and a water-stop mechanism is provided on an outer peripheral portion of a tip portion of the inner trunk. However, in such a case, a protection cylinder member for protecting the water stopping mechanism from earth and sand, a protection member having substantially the same function as the protection cylinder member, a plurality of hydraulic cylinders, and the like must be provided. As described above, since the protective cylinder member or the similar protective member, a plurality of hydraulic cylinders, and the like are used, the manufacturing cost is high. In addition, if the annular seal member of the water stop mechanism is damaged or worn by earth and sand, gravel, etc., the soil water pressure will violently flow into the shield machine, and after ground bonding, the worker will enter inside and safely Internal equipment and attached equipment cannot be removed. In such a case, the pressure of the soil water flowing into the inside must be discharged by a plurality of workers using a pump or the like, which increases the cost and the construction period.

By the way, the penetration ring provided near the inside of the trunk member of the penetration shield excavator is sequentially extruded with a plurality of extrusion jacks to partially penetrate into the front end of the reception shield excavator, and the tip of the penetration ring is extruded. Although the technology to stop water by pressing the part against a rubber pressure receiving ring is also in practical use, since the pressure receiving ring is arranged inside near the front end of the trunk member, the pressure receiving ring is used during normal shield excavation Is liable to wear due to friction with the earth and sand in the chamber behind the cutter disk, and if the amount of wear is large, the water stopping function after underground joining cannot be ensured. Moreover, earth and sand and gravel are likely to bite between the pressure receiving ring and the tip of the penetrating ring, and the water stoppage tends to decrease.

An object of the present invention is to provide an underground junction type shield excavator which can secure water stopping performance, simplify the internal structure of the shield excavator, and shorten the length of the shield excavator.

[0013]

According to a first aspect of the present invention, there is provided an underground junction type shield machine comprising: a first shield machine; and a second shield machine having substantially the same diameter as the first shield machine. 1, an underground joint type shield excavator in which a second shield excavator is excavated in a phase approaching direction to join the two underground, wherein the first shield excavator includes a shaft near an inner side of its trunk member. A cylindrical penetrating ring movably mounted in the direction, an extruding means for extruding the penetrating ring until the penetrating ring is inserted into the inner surface side of the hood portion of the trunk member of the second shield machine, and a passage gap of the penetrating ring. Spoke diameter reduction means for radially reducing the tip of the cutter spoke of the cutter disk, and the outer circumference of the tip of the penetrating ring to press against the inner peripheral surface of the hood of the second shield machine Annular seal Water stopping means for stopping water through a member, provided near the inside of the trunk member of the first shield machine
Slidable relative to the outer surface of the water stopping means in the axial direction.
And an annular guide member for covering and protecting the water stopping means.
The water stopping means is provided on the outer periphery of the distal end of the penetration ring.
Annular recess provided, and an annular bullet disposed in the annular recess
Membrane member and annular seal portion outside the annular elastic membrane member
Pressurized water is injected into the inner surface of the annular elastic membrane member
Sealing member on the inner peripheral surface of the hood of the second shield machine
Pressurized water injection means to be pressed against the wall of the penetration ring
Pressurized water injection means having a through-pressurized water passage
It is characterized in that the.

When the first and second shield excavators are excavated in the direction of approaching each other and are joined underground, the cutter disks of both shield excavators are approached to approach and face each other, and the excavation is stopped. The spoke diameter reduction means of the excavator is operated to reduce the diameter to form a passage gap for the penetrating ring. Then, the penetrating ring of the first shield excavator is extruded and driven by the extruding means, and the penetrating ring is connected to the body of the second shield excavator. The member is penetrated until it is inserted into the inner surface of the hood portion, and then the annular seal member of the water stopping means provided on the outer peripheral portion of the penetration ring is pressed against the inner peripheral surface of the hood portion to stop water. Thereafter, a backing agent such as mortar is injected between the penetration ring and the ground.

As described above, the penetration ring of the first shield machine is provided with the water stopping means, and at the time of underground joining, the annular seal member of the water stopping means is attached to the inner peripheral surface of the hood portion of the second shield machine. Since the water is stopped by pressure contact, the internal structure for underground joining in both shield excavators can be simplified, and during normal excavation, the water stopping means is retracted to the inner surface side of the body member , and the first shield Installed near the inside of the body member of the excavator
Since the protective ring can be protected by the annular ring member, there is no need to separately provide a protective cylinder member or a similar protective member that can be retracted to protect the water stopping means, and the manufacturing cost can be reduced. In particular, since the internal structure of the second shield machine is not retracted with respect to the trunk member, the internal structure can be simplified, the length of the second shield machine can be shortened, and the second shield machine can be introduced into the shield mine. Since the diameter of the shaft can be reduced, the construction cost can be reduced.

Further, water stop means includes an outer peripheral portion recessed by an annular recess in the distal end portion of the penetration ring, outer annular seal of the annular elastic membrane disposed in the annular recess member and the annular elastic membrane member A member and pressurized water injection means for injecting pressurized water into the inner surface of the annular elastic membrane member to press the annular seal member against the inner peripheral surface of the hood of the second shield machine .
Therefore, when stopping water, for example, the soil and gravel in the chamber are replaced with high-concentration muddy water, and pressurized water is injected into the inner surface side of the annular elastic membrane member by the pressurized water injection means to thereby seal the annular seal member with the second shield. Pressing against the inner peripheral surface of the hood portion of the excavator can stop water between the penetration ring and the hood portion.

Moreover, pressurized water injection means has have a Toru設been pressurized water passage in the wall of the penetration ring. Therefore, when the penetration ring is formed to have a thickness of, for example, about 30 to 40 mm, a pressurized water passage having a diameter of about 10 mm can be provided through the wall. Since the pressurized water passage is not exposed and is penetrated through the wall, it can be prevented from being damaged or damaged by earth and sand, gravel, etc., the structure of the water stopping means can be simplified, and the first shield excavation The internal structure of the machine can be simplified.

According to a second aspect of the present invention, there is provided an underground junction type shield machine.
The invention according to claim 1 , wherein a backing agent injection pipe for injecting the backing agent between the penetration ring and the ground is provided at a front end portion of the trunk member of the second shield machine. is there. The annular sealing member of the water stopping means is pressed against the inner peripheral surface of the hood to stop the water, and then a backing agent such as mortar is injected from the backing agent injection pipe between the penetration ring and the ground. In this case, a plurality of backing agent injection tubes are provided, for example, at equal intervals in the circumferential direction on the outer peripheral portion of the front end portion of the body member, and each backing agent injection tube is protected by a cover member or the like. Often,
Alternatively, it may be provided through the wall of the front end portion of the trunk member.

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

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 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 1A includes a cutter disk 2 for excavating a face, a chamber 3, a cylindrical body member 4, and a cutter rotation driving mechanism 5 for driving the cutter disk 2 to rotate.
And a plurality of shield jacks 6 that generate excavation thrust
And an erector device 7 for assembling the segment S to the tunnel pit wall, and a sludge discharging mechanism 8 for discharging the excavated earth and sand to the outside
And a penetration ring 9 penetrating to the inner surface side of the hood portion 76 (see FIG. 2) of the trunk member 62 of the shield machine 1B at the time of underground joining, an extrusion mechanism 10 of the penetration ring 9, and a penetration ring 9. And a water stop mechanism 11 provided.

The cutter disk 2 will be described.
As shown in FIG. 1, the cutter disc 2 includes a center frame 12, a plurality of extendable cutter spokes 13 extending radially from the center frame 12, a ring frame 14, and an annular ring having the same diameter as the body member 4. Outer ring 1
5 and a number of cutter bits 16 and the like attached to the cutter spokes 13.

Each of the cutter spokes 13 includes a fixed cutter spoke 13a extending from the center to the vicinity of the outer periphery, a hydraulic cylinder 17 (corresponding to spoke reducing means), and a movable cutter spoke 13b forming the tip of the cutter spoke 13. And a movable cutter spoke 13b driven by the hydraulic cylinder 17 to move in the diameter reducing direction. The piston rod of the hydraulic cylinder 17 is connected to the ring frame 14, and the cylinder body is connected to the movable cutter spoke 13b. In the case of underground joining, the movable cutter spoke 13 b is radially reduced in diameter by the hydraulic cylinder 17 so as to form a passage gap for the penetration ring 9.
An outer peripheral ring 15 is provided on the outer peripheral portion of the cutter disk 2, and the outer peripheral ring 15 has a movable cutter spoke 13 b
The tip of the movable cutter spoke 13b is engaged with the engaging portion 1a during tunnel excavation.
5a.

The body member 4 is a cylindrical member.
Is provided with a partition wall 19 and a support wall 20 via a cylindrical member 18 (described later) arranged concentrically with the body member 4, and provided with annular web members 21 and 22 and the like. The partition wall 19 is disposed inside the vicinity of the front end of the body member 4, and the partition wall 19 is formed with an annular concave portion 19a. The chamber 3 is formed between the cutter disk 2 and the partition wall 19. An annular cutter drum 23a is connected to the rear end of the cutter disk 2 via a plurality of connecting members 23, and the cutter drum 23a is inserted into the annular concave portion 19a and is rotatably supported in a liquid-tight manner. . The cutter disc 2 is provided with a rotary joint 24, and an oil path and the like for supplying a hydraulic pressure from a hydraulic pressure source to the hydraulic cylinder 17 via the rotary joint 24 are provided.

The cutter rotation drive mechanism 5 will be described. A ring gear 25 is provided at the rear end of the cutter drum 23a.
Is fixed on the support wall 20 on the rear side of the annular concave portion 19a.
A plurality of cutter drive motors 26 are provided, and a pinion 27 at the tip of an output shaft of each cutter drive motor 26 is meshed with a ring gear 25, and the cutter disk 2 is driven by the plurality of cutter drive motors 26 in forward and reverse rotations.

A plurality of tail seals 28 are provided at the rear end of the body member 4 for preventing earth and sand from the ground from entering the inside of the shield machine 1A. A rear work deck 29 is provided inside, and the rear work deck 29 is provided with a perfect circle holding device 30 for keeping the segment S in a perfect circle.

The shield jack 6 for generating the excavating thrust will be described. A plurality of shield jacks 6 are arranged rearward at appropriate circumferential intervals at an inner portion of the trunk member 4 at a substantially intermediate portion in the front-rear direction. The cylinder body of the shield jack 6 is fixed to the annular web 22, and the front end of the cylinder body is received by the annular web material 21 from the front side. Spreaders 32 are pin-connected to the distal ends of the piston rods of the shield jacks 6 through eccentric fittings 31. The piston rods of the shield jacks 6 are extended, and the segments S covered on the inner surface of the tunnel Ta by the spreaders 32. Pressing the front end of the vehicle generates a digging thrust.

The erector device 7 will be described. The erector device 7 includes a rotary drum 33, an eletric body 34, and an electric or hydraulic drive motor 35 for driving the rotary drum 33 to rotate. Each of the brackets 36 is provided with a supporting roller 37,
3 is rotatably supported by a plurality of support rollers 37. Each time one ring is excavated in the tunnel Ta, the segmenter S is assembled by the erector device 7 over the entire circumference of the tunnel shaft wall for one ring.

The sludge discharging device 8 will be described. The sludge discharging device 8 includes a water pipe 38 for sending muddy water into the chamber 3 and a mud pipe 3 for discharging the excavated earth and sand in the chamber 3 to the outside.
9 and an agitator 40 for stirring earth and sand and muddy water in the chamber 3. A valve is interposed in each of the water pipe 38 and the drain pipe 39. Muddy water is supplied to the chamber 3 from a water supply source extending from a rear shaft via a water supply pipe 38, and the earth and sand in the chamber 3 are stirred by the agitator 40 to become more muddy water or muddy water containing sediment and gravel. It is discharged from the mud pipe 39 to the outside via the shaft in the rear.

Next, the penetration ring 9 and its pushing mechanism will be described. As shown in FIGS. 1 and 3 to 6, near the inside of the substantially front half of the body member 4, a body member 4 and a cylindrical member 18 are provided.
, An annular sealing plate 41, and an annular guide member 42 joined to the vicinity of the front end of the body member 4 to form a cylindrical ring housing portion 43 having an open front end. A penetrating ring 9 is disposed concentrically with the body member 4, and the penetrating ring 9 is provided movably axially forward in the ring accommodating portion 43. As shown in FIG. 6, seal members 44 and 45 provided on the outer surface of the front end of the cylindrical member 18 are provided.
The inner and outer surfaces of the penetrating ring 9 are sealed with the sealing members 46 and 47 on the inner surface of the guide member 42, and the ring housing 43
Sediment is not allowed to enter.

As shown in FIG. 1, a penetration ring 9 is inserted into the inner surface of the hood portion 76 of the body member 62 of the second shield excavator 1B at a position near the inner periphery at a substantially middle portion in the front-rear direction of the body member 4. Extrusion jacks 10 that are driven to extrude until
(Corresponding to extrusion means) is provided. As shown in FIGS. 1 and 6, a plurality of fixed push rods 48 are fixed to the rear end of the penetrating ring 9 so as to face the push-out jacks 10. When pushing out the penetration ring 9 by the pushing jacks 10, the penetration ring 9 is pushed out and driven by a plurality of pushing jacks 10 while the push rod 49 is sequentially screwed to each fixed push rod 48.

Next, the water stopping mechanism 11 provided on the penetration ring 9 will be described. As shown in FIGS. 1, 3, and 7, the water stopping mechanism 11 includes an annular recess 50 formed in the outer peripheral portion of the distal end of the penetration ring 9, and an annular elastic film provided in the annular recess 50. The pressurized water is injected into the member 51 and the annular seal member 52 outside the annular elastic membrane member 51 and the inner surface side of the annular elastic membrane member 51 so that the annular seal member 52 is formed on the inner periphery of the hood portion 76 of the second shield machine 1B. And a pressurized water injection mechanism for pressing against the surface.

That is, a flexible annular elastic membrane member 51 is provided in the annular concave portion 50, and the front end of the annular elastic membrane member 51 is fixed to the penetrating ring 9 by an annular stopper 53 and a bolt. The rear end of the annular elastic membrane member 51 is fixed to the penetration ring 9 by an annular stopper 54 and a bolt. An annular seal member 52 is provided outside the annular elastic membrane member 51.
Is provided, and the front end of the annular seal member 52 is
It is fixed at 3. The annular seal member 52 is an elastic plate wrapped with a large number of thin elastically deformable synthetic rubber materials or synthetic resin materials having a predetermined small width in the circumferential direction and wrapped with a synthetic resin material, and is arranged while being partially wrapped in the circumferential direction. Of structure. Therefore, the annular elastic membrane member 51 and the annular seal member 5
2 is elastically deformable from the state shown in FIG. 3 to the state shown in FIGS.

The pressurized water injection mechanism (pressurized water injection means) will be described.
By injecting pressurized water into the inner surface of the annular elastic membrane member 51, FIG.
As shown in FIG. 7, the annular seal member 52 is for pressing the inner peripheral surface of the hood portion 76 of the second shield machine 1B, and has a pressurized water supply source and a pressurized water passage 55. A pressurized water passage 55 is provided through the wall of the penetration ring 9, and pressurized water can be supplied from the pressurized water supply source to the inner surface of the annular elastic membrane member 51 via the pressurized water passage 55.

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 60, a chamber 61, a cylindrical body member 62, a cutter rotation driving mechanism 63 that rotationally drives the cutter disk 60,
A plurality of shield jacks 64, an erector device 65,
It is provided with a sludge discharging facility 66 and the like.

Referring to the cutter disk 60, as shown in FIG. 2, the cutter disk 60 has substantially the same configuration as the cutter disk 2 of the penetrating-side shield excavator 1A, and includes a center frame 67 and a plurality of cutter disks. Extendable cutter spoke 68 and ring frame 6
9, an annular outer ring 70, a large number of cutter bits 71 and the like. Each cutter spoke 68 includes a fixed cutter spoke 68a, a hydraulic cylinder 72 (corresponding to spoke diameter reducing means), and a movable cutter spoke 68b driven by the hydraulic cylinder 72 to move in the diameter reduction direction.

The piston rod of the hydraulic cylinder 72 is connected to the ring frame 69, and the cylinder body is connected to the movable cutter spoke 68b. In the case of underground joining, the movable cutter spoke 68b is radially reduced in diameter by the hydraulic cylinder 72 in order to form a clearance through which the penetration ring 9 passes. An outer peripheral ring 70 is provided on an outer peripheral portion of the cutter disk 68, and an engaging portion 70a is formed on the outer peripheral ring 70 to be engaged with a tip of the movable cutter spoke 68b. It is engaged with the engaging portion 70a.

The body member 62 is a cylindrical member. The body member 62 is provided with a partition 73, a support wall 74, an annular web member 75, and the like. The partition 73 is provided near the front end of the body member 62. An annular concave portion 73a is formed in the partition wall 73. In the body member 62, a range from the tip to the vicinity of the support wall 74 is particularly called a hood portion 76.

As shown in FIGS. 2 and 7, for example, four backing agent injection pipes 7 are provided on the outer peripheral portion of the hood 76 of the body member 62.
7 are arranged at equal intervals in the circumferential direction, and each backing agent injection pipe 77 is provided.
Are protected by being covered with a cover member 78 made of a steel plate. A valve 7 for supplying a backing agent from the backing agent supply source to these backing agent injection pipes 77 is provided near the inner periphery of the body member 62.
A discharge hole (not shown) for discharging the backing agent from the inner peripheral portion of the tip of the hood portion 76 to the outside of the penetration ring 9 is formed in the hood portion 76.

As shown in FIG.
A chamber 61 is formed between the inner wall and the partition wall 73. A cutter drum 80a is connected to the rear end of the cutter disk 60 via a plurality of connecting members 80. The cutter drum 80a is inserted into the annular concave portion 73a. It is rotatably supported in a liquid-tight manner. The cutter disc 60 is provided with a rotary joint 81.
An oil passage or the like for supplying a hydraulic pressure from a hydraulic pressure supply source to the hydraulic cylinder 72 via the oil supply source is provided.

The cutter rotation drive mechanism 63 will be described. The ring gear 8 is provided at the rear end of the cutter drum 80a.
A plurality of cutter drive motors 83 are provided on the support wall 74 on the rear side of the annular recess 73 a of the partition wall 73, and a pinion 84 at the tip of the output shaft of each cutter drive motor 83 meshes with the ring gear 82. The cutter disk 60 is driven forward and reverse by the plurality of cutter drive motors 83.

A plurality of tail seals 85 are provided at the rear end of the body member 62, and a rear work deck 86 is provided inside the body member 62 near these tail seals 85. Is provided with a perfect circle holding device 87 for keeping the full circle. The shield jack 64 will be described. A plurality of shield jacks 64 are disposed rearward at appropriate circumferential intervals at an inner side of a substantially intermediate portion of the trunk member 62 in the front-rear direction. , And the front end of the cylinder body is received by the support wall 74 from the front side. A spreader 89 is attached to the tip of the piston rod of each shield jack 64 via an eccentric fitting 88.
Are pin-connected, the piston rods of the shield jacks 64 are extended, and the tunnel T
Pressing the front end of the segment S lining the inner surface of b generates a digging thrust.

The erector device 65 will be described. The erector device 65 has a rotating drum 90, an erector main body 91, and an electric or hydraulic drive motor 92 for driving the rotating drum 90 to rotate. Each of the brackets 93 is provided with a supporting roller 94, and the rotating drum 90 is rotatably supported by a plurality of supporting rollers 94. Explaining the sludge discharging equipment 66, the sludge discharging equipment 6
6 is provided with a water pipe 95 for sending mud water into the chamber 61, a mud pipe 96 for discharging the excavated earth and sand in the chamber 61, an agitator 97 for stirring the earth and sand in the chamber 61, and the like. I have. Water supply pipe 95 and drain pipe 96
Are each provided with a valve.

Next, the operation of the underground shield type shield machine described above will be described. However, the following description includes the description of the underground joining method. As shown in FIG. 3, when the shield excavator 1A and the shield excavator 1B are excavated in the phase approaching direction and their front ends are joined in the ground, in the first step, the shield excavators 1A and 1B are connected. When the cutter disks 2 and 60 approach each other and approach each other, the two shield excavators 1 are joined at the confluence of the two tunnels Ta and Tb.
The excavation of A and 1B is temporarily stopped. During tunnel excavation, the movable cutter spoke 13b of the shield excavator 1A is used.
Is in the diameter increasing position, and the movable cutter spoke 68b of the shield machine 1B is also in the diameter increasing position.

At this time (when the shield excavators 1A and 1B are approached), as shown in FIG.
The two shield excavators 1A, 1B are checked so that their axes substantially coincide with each other, and the positional relationship between the two shield excavators 1A, 1B is confirmed using a boring machine (not shown).
B advance each other and stop. That is, the drill of the boring machine is sequentially inserted into the valve 98 and the pipe-shaped member 98a on the shield excavator 1A side, and sequentially inserted and penetrated into the pipe-shaped member 98a and the valve 98 on the shield excavator 1B side.

Next, as shown in FIG. 5, in the second step, the movable cutter spokes 13b of the cutter disc 2
To form a gap for the penetration ring passage,
The movable cutter spoke 68b of the cutter disk 60 is reduced in diameter to form an annular penetration ring passage gap. Almost in parallel with this, high-concentration muddy water with a high clay content is introduced into the chambers 3 and 61 from the water pipes 38 and 95 while discharging the gravel and soil in the chambers 3 and 61 from the mud pipes 39 and 96 to the outside. I do.

Next, as shown in FIG. 6, in a third step, a push rod 49 of a predetermined length is sequentially screwed and connected to each of the plurality of fixed push rods 48 behind the penetration ring 9. , A plurality of extrusion jacks 10 (see FIG. 1)
By repeatedly pushing the rear end of the push rod 49 with
The penetration ring 9 on the shield machine 1A side is penetrated to the inner surface side of the hood portion 76 of the body member 62 of the shield machine 1B through the gap for passing both penetration rings. Thereby, the water stop mechanism 11 becomes operable.

Next, as shown in FIGS. 6 and 7, when pressurized water is injected from the pressurized water supply source into the inner surface of the annular elastic membrane member 51 via the pressurized water passage 55, the annular elastic membrane member 51 is pressed by the water pressure of the pressurized water. The annular seal member 52 expands outward, and the annular seal member 52 is pressed outward and tilts in a tapered shape, and the rear end of the annular seal member 52 is connected to the hood portion 76 of the shield machine 1B.
Is press-contacted to the inner peripheral surface, and the space between the penetration ring 9 and the hood portion 76 is sealed.

Thereafter, the high-concentration mud in both chambers 3 and 61 is discharged to the outside through mud pipes 39 and 96. Next, FIG.
In the fourth step, as shown in FIG.
(See FIG. 7), a backing agent such as mortar is injected between the penetration ring 9 and the ground. And shield machine 1B
A part of the internal structural material is removed to form an access passage for an operator into the chamber 61, and the water stop ring 99 is welded to the distal end portion of the penetration ring 9 and the inner peripheral surface of the hood portion 76, The annular gap between the distal end portion of the penetration ring 9 and the inner peripheral surface of the hood portion 76 is closed in a watertight manner, and water stop welding is performed over the distal end of the cylindrical member 18 and the penetration ring 9. afterwards,
The trunk members 4, 62, the penetration ring 9, etc. are left underground,
Other internal structural materials and accessories of the shield machine 1A and 1B are removed, and the tunnels Ta and Tb are connected. Note that the water stop ring 99 may be a ring that is formed by combining a plurality of circular arc-shaped members that are divided in the circumferential direction into a ring shape.

According to the underground joint type shield excavator and the underground joint method described above, the water stopping mechanism 11 is provided on the outer peripheral portion of the tip of the penetration ring 9 of the shield excavator 1A,
At the time of underground joining, the penetration ring 9 is pushed out until it is inserted into the inner surface side of the hood portion 76 of the shield machine 1B, and the annular seal member 52 of the water stopping mechanism 11 is pressed against the inner peripheral surface of the hood portion 76 to stop water. As a result, the internal structure for underground joining can be simplified, and the water stopping mechanism 11 can be retracted to the inner surface side of the body member 4 and protected during normal excavation. It is not necessary to separately provide a protection cylinder member for protecting the water mechanism 11 from earth and sand, gravel, or the like, or a similar protection member, so that manufacturing costs can be reduced. Since there is no need to retreat the internal structure of the shield machine 1B with respect to the body member 62, the internal structure of the shield machine 1B can be simplified, so that the length of the shield machine 1B can be shortened and the shield machine 1B can be shielded. Since the diameter of the shaft to be introduced into the pit can be reduced, the construction cost can also be reduced.

The earth and sand, gravel and the like in the chambers 3 and 61 are replaced with high-concentration muddy water, and pressurized water is injected into the inner surface of the annular elastic membrane member 51 so that the annular seal member 52 is connected to the hood section 76 of the shield machine 1B. Is pressed into contact with the inner peripheral surface of the hood, so that water can be stopped between the penetration ring 9 and the hood portion 76 without biting earth and sand or gravel. Since the pressurized water injection mechanism has the pressurized water passage 55 penetrated through the wall of the penetration ring 9,
The pressurized water passage 55 can be prevented from being damaged or damaged by earth and sand, gravel, etc., the structure of the water stop mechanism 11 can be simplified, and the internal structure of the shield machine 1A can be simplified.

At the front end of the body member 62 of the shield machine 1B, a backing agent injection pipe 77 for injecting a backing agent between the penetration ring 9 and the ground is provided, and the annular seal member 52 of the water stopping mechanism 11 is connected. After pressing against the inner peripheral surface of the hood portion 76 to stop water,
Since the backing agent such as mortar is injected between the penetration ring 9 and the ground from the backing agent injection pipe 77, water can be stopped between the penetration ring 9 and the ground by the solidified backing agent, and the internal structural materials and attached Equipment can be safely removed.

Next, a modified embodiment in which this embodiment is partially modified will be described. 1) Instead of the muddy water discharge facilities 8 and 66, an earth pressure discharge equipment may be applied. 2) The body member may be provided with a center bending portion and a center bending jack so as to be capable of turning. 3) For example, in a stratum with few gravel, the inside of the chambers 3 and 61 does not necessarily need to be replaced with high-concentration muddy water. 4) The outer diameter of the trunk member 4 may be larger or smaller than the outer diameter of the trunk member 62. However, it is within a range in which a passage gap of the penetration ring 9 is secured and the annular seal member 52 can be pressed against the inner peripheral surface of the hood portion 76. 5) A backing agent injection pipe for injecting the backing agent between the penetration ring 9 and the ground may be provided through the wall of the front end portion of the body member 62. In addition, without departing from the spirit of the present invention, it is possible to implement the above-described embodiment with various modifications.

[0058]

According to the first aspect of the present invention, a water stopping means is provided on an outer peripheral portion of a tip end portion of the penetrating ring of the first shield excavator, and the penetrating ring is connected to the second shield excavator at the time of underground joining. The inner seal side of the hood is pushed out until it is inserted into the inner side of the hood, and the annular seal member of the water stopping means is pressed against the inner peripheral surface of the hood to stop water. The structure can be simplified, and during normal excavation, the water stopping means is retracted to the inner surface side of the body member, so that the first shield machine
Protected by an annular ring member provided near the inside of the trunk member
It is possible to, it is not necessary to provide a protective member similar to the reverse drivable protecting cylinder member or its to protect the water stopping means from the sand and gravel and the like, it is possible to reduce the manufacturing cost. Since there is no need to retract the internal structure of the second shield excavator with respect to the trunk member, the internal structure can be simplified, the length of the second shield excavator can be shortened, and the second shield excavator is introduced into the shield mine. Since the diameter of the shaft for carrying out the work can be reduced, the construction cost can also be reduced.

The water stopping means includes an annular elastic membrane member and an annular
Seal member and pressurized water injection means.
Then, for example, the earth and sand, gravel, etc. in the chamber are replaced with high-concentration muddy water, and pressurized water is injected into the inner surface side of the annular elastic membrane member by pressurized water injection means so that the annular seal member is turned into a hood portion of the second shield machine. When pressed against the inner peripheral surface of the, the water between the penetration ring and the hood can be stopped. Therefore, it is possible to surely stop water without earth and sand, gravel, and the like biting between the annular seal member and the hood portion .

[0060] Further, since the pressurized water injection means comprises a Toru設been pressurized water passage in the wall of the penetration ring, prevents the pressurized water passage are damaged or broken by sand or gravel or the like,
The structure of the water stopping means can be simplified, and the internal structure of the first shield machine can be simplified .

According to the second aspect of the present invention, the backing agent injection pipe for injecting the backing agent between the penetration ring and the ground is provided at the front end portion of the trunk member of the second shield machine. After the annular sealing member of the water means is pressed against the inner peripheral surface of the hood to stop water, a backing agent such as mortar can be injected between the penetration ring and the ground from the backing agent injection pipe, and the backing can be performed. The water stopping performance is enhanced by the agent, and the internal structural materials and attached equipment can be safely removed. Other effects are the same as those of the first aspect.
You.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of a first 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 second shield machine.

FIG. 3 is an operation explanatory diagram showing a state where both shield excavators approach and face each other.

FIG. 4 is an operation explanatory view showing a joint preparation stage of the two shield excavators.

FIG. 5 is an operation explanatory view showing a reduced diameter state of a cutter spoke and the like.

FIG. 6 is an operation explanatory view showing a state in which a penetration ring is driven to be pushed out and an operation state of a water stop mechanism.

FIG. 7 is an enlarged sectional view of a main part of a water stop mechanism and the like.

FIG. 8 is an operation explanatory view showing a filling state of a backing agent, a welding joint state of a water stop ring, and the like.

[Explanation of symbols]

 1A, 1B Shield machine 2, 60 Cutter disk 3, 61 Chamber 4, 62 Body member 9 Penetration ring 10 Extrusion jack 11 Water stop mechanism 13, 68 Cutter spoke 13b, 68b Movable cutter spoke 17, 72 Hydraulic cylinder 51 Ring elastic membrane Member 52 Annular seal member 55 Pressurized water passage 76 Hood 77 Back filling agent injection pipe 99 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-A-11-193690 (JP, A) JP-A-5-156887 (JP, A) JP-A-63-22994 (JP, A) JP-A-8-15883 (JP, A) JP-A-6-57990 (JP, U) Patent 2512257 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 301 E21D 9/06 302

Claims (2)

(57) [Claims] 1. A first shield excavator and a second shield excavator having substantially the same diameter as the first shield excavator, wherein the first and second shield excavators are excavated in a phase approaching direction and both are excavated. An underground joint type shield excavator adapted to be joined underground, wherein the first shield excavator includes a cylindrical penetrating ring mounted near the inside of its trunk member so as to be movable in the axial direction, and a penetrating ring. Means for extruding and driving the inner portion of the hood portion of the body member of the second shield excavator until it is inserted, and 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 penetration ring. spokes diameter means, is equipped on the outer periphery of the distal end of the penetration ring, a water shut-off means for stopping water through the annular seal member is pressed against the inner circumferential surface of the receptacle of the second shield machine, the 1st shield dig Provided near the inside of the trunk member of the machine
The outer surface of the water stopping means is slidably covered in the axial direction.
An annular guide member for protecting the water stopping means, and wherein the water stopping means is provided on the outer peripheral portion of the distal end portion of the penetration ring.
Annular concave portion and an annular elastic membrane disposed in the annular concave portion
Member and annular seal member outside the annular elastic membrane member
And pressurized water is injected into the inner surface of the annular elastic
Pressure member on the inner peripheral surface of the hood of the second shield machine.
Pressurized water injection means to be in contact with the
Pressurized water injection means having a pressurized water passage provided
And, underground junction shield machine, characterized in that. The front end portion according to claim 2, wherein the second shield machine body member, providing the Urakomi injection tube for injecting Urakomi agent to penetrate the ring and the earth mountains in claim 1, wherein Underground junction type shield machine described.