JP3396029B2 - Underground junction type shield machine - 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 joint type shield machine, and more particularly, a front end portion of a body member of a first shield machine is fitted onto a hood portion of a front end of a body member of a second shield machine. The present invention relates to an underground joint that is configured to clean mud adhered to the outer peripheral surface of the hood portion with cleaning water.

[0002]

2. Description of the Related Art In recent years, a tunnel for water and sewerage, a common ditch, and the like are often excavated by a shield construction method. In that case, there is a restriction on the construction period, and there is a limit to the distance that can be excavated by one shield excavator. For this reason, usually, a plurality of shafts are provided and the sections between the shafts are often shared by the shield machines. The tunnel may have the same diameter, or the diameter may change midway.

In the case of a tunnel formed underground in an urban area,
Since it is often impossible to form a shaft due to the congestion of structures both underground and above ground, two shield excavators of the same diameter or different diameters are excavated in the approaching direction from the separation point, and finally 2
Various techniques have been proposed for joining the front end portions of the shield machine of the platform to the ground.

When the front end portions of these shield machines are ground-joined, the joint portions are sealed so that water, earth and sand, and backfill material do not flow into the shield machine. It is necessary to remove the internal equipment and structural members of the shield machine. If the seal is inadequate, prepare a drainage pump, introduce a drainage hose from the vertical shaft and connect it, and use the drainage pump and drainage hose to discharge water, earth and sand and backfill material, Since it is necessary to take a water-stopping measure that is used in combination to seal the leak, a large amount of cost is required and the construction period for underground joints is prolonged. In addition, this waterproofing work is extremely dangerous because there is no guarantee that water will be completely sealed when the amount of water leakage is large.

In the underground junction type shield excavator disclosed in Japanese Unexamined Patent Publication No. 5-248170, at the time of underground junction, the cutter disk of the receiving side first shield excavator is retracted into the body member by a predetermined distance. The cutter disk of the second shield machine on the penetration side is fitted therein, and the water seal of the inner peripheral portion of the body member of the first shield machine is expanded with pressurized water to stop the water. Seal with the earth and sand seal on the inner circumference of the machine body tip. With this structure, there are many sealing points, and even if the water seal is expanded on the outer peripheral surface of the cutter disk to which the earth and sand are adhered, the water stop tends to be defective, and the durability of the water seal cannot be guaranteed.

Therefore, the inventors of the present application have disclosed in Japanese Patent Laid-Open No. 2000-
An underground junction type shield machine as shown in Japanese Patent No. 265781 has been proposed. In this underground junction type shield machine,
A plurality of arc-shaped scrapers and a plurality of hydraulic cylinders for advancing and driving these scrapers are provided on the inner peripheral portion of the front end portion of the body member of the first shield machine, and a waterproof seal is provided on the inner peripheral portion of the body member. It is provided.

In the case of underground bonding, the cutter disk of the first shield machine is reduced in diameter and then retracted into the body member by a predetermined distance, and the cutter disk of the second shield machine is reduced in diameter. In a state in which the hood portion is thrust into the inside of the body member of the first shield machine for a predetermined distance, the plurality of scrapers are moved inward by the plurality of hydraulic cylinders and brought into contact with the outer peripheral surface of the tip of the hood portion, Then again the second
When the shield machine is moved forward, the hood advances to the underground joint position while the soil on the outer peripheral surface of the hood is scraped off by the plurality of scrapers. Then, when the water shut-off seal of the first shield machine is expanded, the water shut-off state is reached.

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the underground joint type shield excavator disclosed in Japanese Patent No. 265781, the capacities of the first shield excavator are increased by the number of scrapers arranged, the weight of the shield excavator is increased, and the manufacturing cost is increased. Progressive performance is also reduced. Moreover, when a plurality of scrapers are moved inward by a plurality of hydraulic cylinders and brought into contact with the outer peripheral surface of the front end portion of the hood portion, if mud or soil adheres to the front end of the hood portion,
Since the mud and earth are pressed against it and the remaining part of the hood is scraped in that state, it is impossible to completely remove the earth and sand on the outer peripheral surface of the hood, and it is possible to stop it with a water seal. It is difficult to secure water performance.

An object of the present invention is to provide an underground joint type shield machine which can reduce the production length of the shield machine, can reduce the manufacturing cost, and can completely remove the earth and sand on the outer peripheral surface of the hood. It is an object of the present invention to provide an underground junction type shield machine equipped with an injection pipe effective for removing soil and sand from the outer peripheral surface of a hood portion and injecting a backfill material.

[0010]

Means for Solving the Problems The underground junction type shield excavator according to claim 1, comprising first and second shield excavators,
In the underground junction type shield excavator in which both of these shield excavators are excavated in the direction of approaching each other to be joined in the ground, the first shield excavator includes a first barrel member, a cutter disk, and a cutter driving means. In the second shield machine, the second trunk member, the cutter disk, and the front end portion of the first trunk member can be externally fitted to each other in a loose fitting manner, and have a ring shape extending forward from the front end of the second trunk member. It has a hood part, and the spoke member of the cutter disk of the second shield machine can be switched between an advanced position partially advanced to the larger diameter side than the hood part and an retracted position retracted into the spoke member. A movable rod and an advance / retreat driving means for driving the movable rod forward / backward, and the movable rod is provided with an injection nozzle for injecting cleaning water onto the outer surface of the hood with the movable rod in the advanced position. When Is shall.

The spoke member provided with the movable rod may be a cutter spoke, or a spoke-shaped member other than the cutter spoke. At least one movable rod may be provided, and at least one injection nozzle may be provided. When advancing the first and second shield excavators in the approaching direction to join them in the ground, in the second shield excavator, the movable rod is switched from the retracted position to the advanced position by the advancing / retreating drive means to move the cutter disk. When the cleaning water is sprayed from the spray nozzle to the outer surface of the hood while rotating, the spray nozzle also sprays the cleaning water while rotating, so the outer surface of the hood is cleaned all around and adheres to the outer surface. The soil is completely washed away. After removing the earth and sand on the outer surface of the hood in this way, the movable rod is switched to the retracted position, and then both shield excavators are grounded.

The underground junction type shield machine according to claim 2 is
In the invention of claim 1, in the second shield machine,
It is characterized in that cleaning water supply means for supplying high-pressure cleaning water is provided to the injection nozzle. When cleaning the hood part, high-pressure cleaning water is supplied from the cleaning water supply means to the spray nozzle to spray the cleaning water.

An underground joint type shield machine according to claim 3 is
The invention according to claim 1 or 2 is characterized in that a plug member capable of closing the injection nozzle and an opening / closing drive means capable of driving the plug member to open / close are provided. In a state where the cleaning water is not jetted from the jet nozzle, the opening / closing drive means can hold the jet nozzle closed by the plug member.
It is possible to prevent the injection nozzle from being clogged with earth and sand. When the cleaning water is sprayed from the spray nozzle, the opening / closing drive means switches the plug member to a position where the spray nozzle is opened.

An underground joint type shield machine according to claim 4 is
The invention according to any one of claims 1 to 3, wherein when the two shield excavators are joined to the ground, the movable rod is switched to an advanced position and the cutter disk of the second shield excavator is rotated while the injection nozzle and the hood section are rotated. The cleaning water is sprayed onto the outer peripheral surface of to remove the earth and sand adhering to the outer peripheral surface of the hood portion. Since the cleaning water can be sprayed from the rotating spray nozzle over the entire circumference of the outer surface of the hood, the outer surface of the hood can be completely cleaned.

[0015]

[0016]

The underground joint type shield machine according to claim 5 is
In the invention of claim 1, the cutter spoke of the cutter disk of the first shield machine has an extendable cutter member that can be switched between an expanded diameter state for excavation and a reduced diameter state in which the diameter is smaller than that of the first barrel member. The cutter spoke of the cutter disk of the second shield machine has an extendable cutter member that can be switched between an expanded diameter state for excavation and a reduced diameter state in which the diameter is smaller than that of the first body member. Is. At the time of the shield excavation, the telescopic cutter members of the first and second shield excavators are excavated with the diameter expanded state, and at the time of underground joining, the telescopic cutter members are switched to the diameter reduced state and then joined.

The underground junction type shield machine according to claim 6 is
In the invention of claim 5 , the first shield machine is
It is characterized in that at least the cutter disk, the cutter driving means, and the partition wall partitioning the chamber are configured so as to be capable of moving backward relative to the first body member by a predetermined distance. In the case of the underground joint type, the second shield machine is a state in which at least the cutter disk, the cutter driving means, and the partition wall of the first shield machine are moved backward by a predetermined distance with respect to the first body member. The hood part of (1) is penetrated into the front end part of the first body member, and is bonded to the ground.

The underground junction type shield machine according to claim 7 is
In the invention of claim 6 , in the first shield machine,
A plurality of hydraulic jacks for driving the cutter disk, the cutter driving means, and the partition wall backward are provided. At the time of underground connection, a large earth pressure acts on the partition that separates the chabber of the first shield machine,
While supporting the soil water pressure with multiple hydraulic jacks,
The cutter disk, the cutter driving means, and the partition are retracted with respect to the body member.

The underground junction type shield machine according to claim 8 is
The invention according to claims 1 to 7 , wherein the front end portion of the first trunk member is externally fitted to the inner peripheral portion of the front end portion of the first trunk member of the first shield excavator. In this state, a water shut-off seal that shuts off water between the first body member and the hood portion is provided. When connecting underground,
With the hood portion penetrating the inner peripheral portion of the front end portion of the first body member, the water blocking seal can be expanded to stop the water between the first body member and the hood portion.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 12, the underground junction shield machine includes a first shield machine 1 and a second shield machine 2 having a diameter substantially the same as that of the first shield machine 1 and both of them. The shield excavators 1 and 2 are excavated toward each other to join them underground. In each shield machine 1, 2, the front, rear, left, and right will be described as front, rear, left, and right in the direction of the excavation.

First, the first shield machine 1 will be described. As shown in FIGS. 1 to 3, the first shield machine 1 includes a first barrel member 10, a cutter disk 11 provided on the front end side of the first barrel member 10, a cutter drive mechanism 12,
Partition wall 14 for partitioning the chamber 13, water-tight seal mechanism 1
5, middle folding part 16, a plurality of middle folding jacks 17, a plurality of hydraulic jacks (not shown) for moving the cutter disk 11, the cutter driving mechanism 12, the partition wall 14 and the like backwards relative to the first barrel member 10, It has a plurality of shield jacks 18 for generating thrust, an erector device 19, a mud discharge facility 20, and the like.

The cutter disk 11 includes a center frame 21, four cutter spokes 22 extending in the radial direction from the center frame 21, four face plates 23 arranged between the cutter spokes 22, and the cutter spokes 22 and the face plate 23 fixed to each other. It has an annular ring frame 24 and the like. Telescopic cutter members 25 are provided on the outer peripheral portions of the four cutter spokes 22, respectively.
5 can be switched between a diameter-expanded state for excavation and a diameter-reduced state in which the diameter is smaller than that of the first barrel member 10 by an internal hydraulic cylinder. Cutter spoke 22 and telescopic cutter member 25
Is provided with a plurality of cutter bits 26, and the face plate is provided with a roller cutter as required.

A spoke member 27 is provided on one face plate 23, and a copy cutter device is provided in the vicinity of the outer periphery of the spoke member 27 so as to be able to move forward and backward. The diameter is smaller than 10. A plurality of stirring blades 29 projecting into the chamber 13 are fixed to the rear ends of the cutter spokes 22 and the spoke members 27.

As shown in FIG. 1, the first body member 10 is composed of a front body 30 and a rear body 31. Inside the front body 30, behind the cutter disk 11 is a chamber 13 via a movable partition wall 14. The central partition 14a of the partition 14 has a cutter driving mechanism 12 including a plurality of hydraulic motors 32 and ring gears (not shown), a rotary joint 33 for supplying hydraulic pressure to the hydraulic system of the cutter disk 11, and the like. Is provided. Cutter drive mechanism 12
Is transmitted to the center member 34, and is transmitted from the center member 34 to the cutter disk 11.

A water sealing mechanism 15 to be described later is provided on the inner peripheral portion of the front end portion of the front body 30.
A protective cylinder member 35 that closes the inner peripheral side of the is provided slidably with respect to the front body 30, the protective cylinder member 35 is fixed to the partition wall 14, and is reinforced by a plurality of brackets 36. The sludge discharge facility 19 has a water supply pipe 37 connected to a water supply system not shown, a drainage pipe 38 connected to a muddy water discharge system not shown, and the like. Valves 37a and 38a are provided on the water supply pipe 37 and the sludge discharge pipe 38, respectively.
The water supply pipe 37 and the sludge discharge pipe 38 are connected by a bypass pipe 39 provided with a bypass valve 39a.
The tip of the chamber 1 is fixed near the upper end of the partition wall 14
It is possible to send water into 3. The mud discharge pipe 38 is fixed near the lower end of the partition wall 14 so that mud water containing earth and sand in the chamber 13 can be sucked. Valve 37a of the water pipe 37
A check boring valve 44, which is used when boring in the preparatory stage for the underground joint, is provided near the inside of the.

As shown in FIG. 1, a ring web 40 is welded to the inner surface of the front end portion of the rear body 31, and the front body 30 and the rear body 31 have a pin connecting portion 41 at the top and the bottom of the center folding portion 16. It is pin-connected via. For example, four middle folding jacks 17 are provided on the left side of the middle folding section 16, four middle folding jacks 17 are provided on the right side of the middle folding section 16, and the tunneling direction is changed to the left or right. When doing so, the direction of the front body 30 with respect to the rear body 31 is changed to the left or the right by the four pairs of center-folded jacks 17.

Since the partition wall 14 is movable with respect to the front body 30, it is necessary to support the soil water pressure acting on the partition wall 14. Therefore, a plurality of stopper members 42 made of steel pipe are arranged at appropriate intervals in the circumferential direction between the partition wall 14 and the ring web 40 in the vicinity of the inner peripheral surface of the front body 30, and the front ends of the stopper members 42 are The rear end of the stopper member 42 that is in contact with the partition wall 14 is fixed to the front body 30 by the bracket 4
It is in contact with 3.

A plurality of shield jacks 18 are arranged at appropriate intervals in the circumferential direction, the jack body of each shield jack 18 is fixed in a penetrating state to the ring web 40, and an eccentric metal fitting is provided at the tip of the rod of each shield jack 18. 1
The spreader 18b is connected via 8a. By bringing the spreader 18b into contact with the front end of the lined segment S, a reaction force is generated when the plurality of shield jacks 18 excavate. As shown in FIG. 1, the erector device 19 includes an erector body 19a, an erector base frame 19b, an erector rotation drive device 19c, and the like. Since this erector device 19 has a general structure, its explanation is omitted.

As shown in FIGS. 4 and 5, an annular waterproof seal mechanism 15 is provided on the inner peripheral portion of the front end portion of the front case 30. The waterproof seal mechanism 15 is for sealing between the first body member 10 and the hood portion 75 of the second shield machine 2 in the underground joint state. The water sealing mechanism 15 includes an annular recess 30 formed in the inner surface of the front body 30.
a, an annular elastic film member 45, an annular seal member 46,
It is composed of a pressurized water injection means including a pressurized water injection pipe 47. The flexible annular elastic film member 4 is provided in the annular recess 30a.
5, the front end portion of the annular elastic film member 45 is fixed to the front body 30 by an annular stopper metal fitting 48 and a bolt, and the rear end portion of the annular elastic membrane member 45 is fixed by an annular stopper metal member 49 and a front body member. It is fixed at 30.

An annular seal member 46 is provided inside the annular elastic film member 45, and the front end portion of the annular seal member 46 is fixed by a stopper 48. The annular seal member 46 is
A large number of thin elastically deformable elastic metal plates 46a having a predetermined small width in the circumferential direction, and a large number of elastic metal plates 46a arranged while being partially wrapped in the circumferential direction are made of synthetic rubber or synthetic resin having excellent elasticity. It has a structure wrapped in. The annular elastic film member 45 and the annular seal member 46 can be elastically deformed from the housed state of FIG. 4 to the sealed state of FIG. Incidentally, reference numeral 30b is a seal member which prevents earth and sand from entering the waterproof seal mechanism 15 during normal excavation.
A tail seal 31a is provided on the rear end side of the rear body 31 to prevent water from entering between the lined segment S and the rear body 31.
(See FIG. 1).

Next, the second shield machine 2 will be described. The second shield machine 2 has substantially the same configuration as the first shield machine 1, and therefore will be briefly described to the extent that members are introduced, and the configuration different from the first shield machine 1 will be described in detail. As shown in FIGS. 6 to 8, the second shield machine 2 includes a second body member 50, a front body 70 and a rear body 71 of the second body member 50, a tubular hood portion 75 connected to a front end portion of the front body 70, Cutter disk 51, chamber 53, front body 7
A partition wall 54 welded to 0 and its central partition wall 54a, a cutter drive mechanism 52 including a cutter drive motor 72, a middle bent portion 56 and a plurality of middle bent jacks 57, a plurality of shield jacks 58, an erector device 59, and a sludge discharge facility 60. , Valve 77a of the water pipe 77 of the sludge discharge device 60, the sludge discharge device 60
A valve 78a of the drainage pipe 78, a bypass pipe 79 and its bypass valve 79a, a ring web 55 welded to the inner surface of the front end portion of the rear body 71, and the like are provided.

The hood portion 75 is the second shield machine 2
It has a smaller diameter than the front body 70 and the rear body 71, and is integrally formed with the front body 70 through the tapered cylindrical portion 76. The front end of the front body 10 can be externally fitted with a gap. The cutter disk 51 has almost the same diameter as the hood portion 75. A tail seal 71a (see FIG. 6) is provided on the rear end side of the rear body 71 to prevent water from entering between the covered segment S and the rear body 71.

Next, a description will be given of a cleaning device 80 for cleaning earth and sand (including mud) attached to the outer surface of the hood 75 at the time of underground bonding. As shown in FIGS. 7 and 9 to 11, the cutter disk 51 has four cutter spokes 62 and their expanding and contracting cutter members 65, a face plate 63, a cutter bit 66, a spoke member 67 incorporating a copy cutter 68, and the like. In addition to these, a spoke member 81 located point-symmetrically with the spoke member 67 is provided, and the rod hole 81 at the tip side portion of the spoke member 81 is provided.
A movable rod 82 is slidably attached to a.

As shown in FIG. 9, the movable rod 82 is retracted into the spoke member 81 at the retracted position, and FIG.
As shown in FIG. 1, a hydraulic cylinder 83 is provided for switching to an advanced position where the spoke member 81 has partially advanced to a larger diameter side than the tip. The hydraulic cylinder 83 includes a cylinder hole 82a formed in the movable rod 82 and a rod member 84 including a piston 84a and a piston rod 84b.
And an oil chamber 85 for advancing and an oil chamber 86 for retreating. An oil passage communicating with the advancing oil chamber 85 and an oil passage communicating with the retreat oil chamber 86 are formed at the center of the rod member 84. The hydraulic system for supplying and discharging hydraulic pressure to and from the hydraulic cylinder 83 is a rotary joint.
Lee cement 73, the oil passage within the center member 74 and the center frame 61, and is constituted by a hydraulic piping 87, 88.

As shown in FIG. 11, the jet nozzle 90 for jetting the washing water to the outer surface of the hood portion 75 has a movable rod 82.
A plug member 91 that is formed rearward and that opens and closes the injection nozzle 90, and an open / close drive cylinder 92 (corresponding to an open / close drive unit) that opens and closes the plug member 91 are provided. The cylinder hole 82b of the open / close drive cylinder 92 has the movable rod 8
2 is provided concentrically with the injection nozzle 90 in the tip portion of the piston 2, and is movably mounted in the cylinder hole 82b of the piston member 9.
A tapered plug member 91 is integrally formed at the tip of the piston 3, and the piston member 93 is biased toward the closed position by a compression coil spring 94.

The wash water supply system for supplying pressurized wash water to the jet nozzle 90 will be described. In the movable rod 82, three narrow passages 95 communicating with the jet nozzle 90 and a trunk where the passages 95 join. Passage 96 and its main passage 9
6 has a washing water pipe 97, a washing water pipe in the center frame 61 and the center member 74, a rotary joint 73, a washing water supply source (not shown), and the like. Before the underground connection, during the tunnel excavation, since the hydraulic pressure is not supplied to the advancing oil chamber 85 of the hydraulic cylinder 83, the movable rod 82 is held at the retracted position, and the pressurized cleaning water is not supplied to the injection nozzle 90. , The injection nozzle 90 is a compression coil spring 94.
It is held in a closed state by the plug member 91 biased by.

When the earth and sand adhering to the outer surface of the hood portion 75 is washed at the time of underground joining, when the hydraulic pressure is supplied to the advancing oil chamber 85 of the hydraulic cylinder 83, the movable rod 82 is switched to the advancing position and the injection nozzle The state 90 faces the outer surface of the hood portion 75. In this state, when pressurized cleaning water is supplied to the trunk passage 96 by the cleaning water supply system, the piston member 93 receiving the water pressure of the cleaning water retracts, the plug member 91 opens the injection nozzle 90, and the hood portion from the injection nozzle 90. Cleaning water is sprayed on the outer surface of 75. Although only one set of the injection nozzle 90 is provided, in the actual cleaning, the cutter disk 5 is used without advancing the second shield machine 2.
Since the cleaning is carried out while rotating 1, the entire outer surface of the hood portion 75 is cleaned.

Furthermore, the first and second shield machines 1, 2
6 and FIG. 8, a large number of injection pipes 98 for injecting a backfill material such as mortar are provided on the inner surface side of the hood portion 75, when each of them is underground-joined. The tip of the injection pipe 98 is open to the outer surface of the hood portion 75, and each injection pipe 98 is provided with an opening / closing valve 98a. At the time of injecting the backfill material, the backfill material supply source is connected to the injection pipes 98 through the backfill material supply system, and the on-off valve 98a is opened to inject the backfill material to the natural ground side.

Next, an underground joining method for joining both shield excavators 1, 2 in the ground by excavating both shield excavators 1, 2 in the approaching direction will be described. The first and second shield excavators 1 and 2 are excavated toward each other, and check boring is performed from the check boring valves 44 and 74 to check the concentricity of both shield excavators 1 and 2. The axes are adjusted so that they substantially coincide with each other, and the cutter disks 11 and 51 of both shield excavators 1 and 2 are brought closer to a state of approaching each other across the ground of the face, and the first shield excavator 1 is stopped. The second shield machine 2 is temporarily stopped. And both shield machine 1,
While discharging the muddy water and the earth and sand in the chambers 13 and 53 of No. 2, high-concentration muddy water is injected from the water supply pipes 37 and 77 to fill the chambers 13 and 53 with the high-concentration muddy water.

Next, in the first shield machine 1,
A fixture is welded to the inner surface of the rear body 31 at the front end of the segment S to support the first body member 10 on the segment.
Next, a plurality of load-supporting hydraulic cylinders are carried in from outside and mounted near the inner surface of the front body 31 at appropriate intervals in the circumferential direction, and the reaction force of each hydraulic cylinder is applied to the ring web 40 via the bracket 43. Then, the piston rod is extended and brought into contact with the partition wall 14.

Next, the telescopic spokes 25 of the cutter disk 11 are switched to the contracted state, the earth pressure acting on the partition wall 14 is supported by a plurality of hydraulic cylinders, and then all the stopper members 42 are removed. Next, by removing the shield jack 18, the center folding jack 17, the cutter driving mechanism 12, the erector device 19, etc., and gradually retracting the rods of the plurality of hydraulic cylinders, the cutter disk 1
1 and the partition wall 14 are moved backward relative to the front body 30, and the second shield machine 2 is provided inside the water stop seal mechanism 15.
The hood portion 75 of is made ready for internal fitting.

Next, the second shield machine 2 is moved forward to approach the first shield machine 1. When the second shield machine 2 reaches the position immediately before the joining position, the second shield machine 2 is temporarily stopped. In that state, the movable rod 82 is supplied to the advancing oil chamber 85 of the hydraulic cylinder 83 of the movable rod 82 to switch the movable rod 82 to the advancing position, and the cleaning water supply source to the injection nozzle 90 through the cleaning water supply system. Cutter disk 5 while supplying pressurized cleaning water
By rotating 1 to wash the outer surface of the hood portion 75 sufficiently.

Next, as shown in FIG. 12, the telescopic spokes 25 of the cutter disk 11 of the first shield excavator 1 are switched to the contracted state, and then the second shield excavator 2 is further moved forward to move the second shield excavator 2 to the second shield. The cutter disk 51 and the hood portion 75 of the excavator 2 are attached to the front body 3 of the first shield excavator 1.
0 is loosely fitted inside. Next, pressurized water is supplied from the pressurized water injecting means to the water sealing mechanism 15 to expand the annular sealing member 46, and the annular sealing member 46 is brought into pressure contact with the outer peripheral surface of the hood portion 75 to bring the water sealing state.

Next, a backfill material such as mortar is injected from the plurality of injection pipes 98 of the second shield machine 2 to the ground side.
After the backfill material solidifies, both shield machine 1 and 2
If the internal components of the second shield machine 2 and the internal structure including the structural members, and the remaining components of the first shield machine 1 are removed while leaving the body members 10 and 50 of the second shield machine 10, the underground joining is completed. .

According to the underground junction type shield excavator described above, the hood portion 75 extending forward from the front end of the front body 70 of the second shield excavator 2 is provided, and at the time of underground junction, the hood portion 75 is provided. Since the structure is to be inserted into the front end portion of the front body 30 of the first shield machine 1, the hood 75 and the front body 30
Only one place between them needs to be sealed. Since the number of sealing portions is reduced to the minimum as described above, not only the number of sealing members can be reduced to reduce the manufacturing cost but also the sealing performance can be improved.

A movable rod 82 is provided on the spoke member 81 of the cutter disk 51 of the second shield machine 2, and a hydraulic cylinder 83 for driving the movable rod 82 forward and backward is provided, and the movable rod 82 is advanced to the movable rod 82. The jet nozzle 90 for jetting the washing water is provided on the outer surface of the hood portion 75 in the state of being positioned, and while the cutter disc 51 is rotated, the washing water is jetted from the jet nozzle 90 to the hood portion 75 to wash the outer surface of the hood portion 75. Since it is configured to do so, the soil on the outer surface of the hood portion 75 can be completely washed in a short time at the time of underground joining, and the spoke member 8 can be used.
1, movable rod 82, hydraulic cylinder 83, injection nozzle 9
Since it has a simple configuration including 0, the machine length of the first and second shield excavators 1 and 2 does not become long, which is advantageous in terms of manufacturing cost.

Since the waterproof seal mechanism 15 is provided, the soil on the outer peripheral surface of the hood portion 75 is surely washed, and then the annular seal member 46 of the waterproof seal mechanism 15 is brought into close contact with the outer peripheral surface of the hood portion 75 to ensure reliability. In addition, the annular seal member 46 does not come into contact with the earth and sand adhering to the outer peripheral surface of the hood portion 75 to be damaged during the underground joint.

Telescopic cutter members 25 and 65 are provided on the cutter spokes 22 and 62 of the first and second shield excavators 1 and 2, and the cutter disks 11 and 51 of the first and second shield excavators 1 and 2 are It can be housed inside the front body 30 of the 1-shield machine 1.

An example in which the above embodiment is partially modified will be described below. However, basically the same components as those in the above-described embodiment will be described with the same reference numerals. 1) As an example of partially changing the injection nozzle 90 and its peripheral structure, as shown in FIGS. 13 to 15, in the cleaning device 80A,
A movable rod 82 similar to that of the embodiment at the front end, a hydraulic cylinder 83 for switching the movable rod 82 between an advanced position and a retracted position, a wash water trunk passage 96 and a small diameter passage 95, and an injection nozzle 100 can be opened and closed. A stopper member 101 and the like are provided. A single-acting hydraulic cylinder 102 for opening the plug member 101 is provided in the tip portion of the movable rod 82.
The oil chamber 104 has an oil chamber 85 for the advance of the hydraulic cylinder 102.
From the hydraulic passage 104a, hydraulic pressure is supplied. The injection nozzle 100 is formed in a cylindrical hole, the plug member 101 is formed in a cylindrical shape that can be inserted into the cylindrical hole, and the plug member 101 is fixed to the tip of a piston rod 103 of a hydraulic cylinder 102.

During normal tunnel excavation, the movable rod 82 is held at the retracted position, and the plug member 101 is used to move the injection nozzle 10
0 is blocked. When the outer surface of the hood portion 75 is washed at the time of underground joining, when hydraulic pressure is supplied to the oil chamber 85 of the hydraulic cylinder 83 and the movable rod 82 is switched to the advanced position, hydraulic pressure is also applied to the oil chamber 104 of the hydraulic cylinder 102. Is supplied and the plug member 101 retracts to open the injection nozzle 100. Similar to the above-described embodiment, the cleaning water is supplied from the cleaning water supply source to the spray nozzle 100, and the cutter disk 51 is rotated while spraying the spray water from the spray nozzle 100 to the outer surface of the hood portion 75 for cleaning.

[0052]

[0053]

[0054]

2 ) The first and second shield machines 1,
The structure for rotatably supporting the cutter disks 11 and 51 in 2 and 2A and the structure for transmitting the rotational driving force to the cutter disks 11 and 51 are merely examples, and are connected to the cutter disks and rotatably supported on the partition wall. It is also possible to employ a configuration in which a special cutter drum is provided and the rotational driving force is transmitted to the cutter drum. Also, instead of the sludge discharge equipment in the first and second shield machine 1, 2, 2A,
In some cases, earth removal equipment may be provided. Other than the above, various modifications may be made to the embodiment without departing from the spirit of the present invention.

[0056]

According to the invention of claim 1, a movable rod that can be switched between an advanced position and a retracted position is provided on the spoke member of the cutter disk of the second shield machine, and an advance / retreat for driving the movable rod to advance / retreat. A drive means is provided, and the movable rod is provided with a spray nozzle that sprays cleaning water onto the outer surface of the hood with the movable rod in the advanced position, so that the soil on the outer surface of the hood is completely washed during underground bonding. In addition, since it has a simple structure including a spoke member, a movable rod, a forward / backward drive means, an injection nozzle, etc.,
This is advantageous in terms of production cost without increasing the length of the first and second shield machines.

According to the second aspect of the present invention, the second shield machine is provided with the cleaning water supply means for supplying the high-pressure cleaning water to the jet nozzle. Therefore, when cleaning the hood part, the cleaning water supply means is used. High-pressure washing water can be supplied to the jet nozzle to jet the washing water. In addition, the same effect as that of the first aspect is provided.

According to the third aspect of the present invention, the plug member capable of closing the injection nozzle and the opening / closing drive means capable of driving the opening / closing of the plug member are provided, and the position of the plug member is switched by the opening / closing drive means. Since it is possible to switch between the state in which the jet nozzle is closed by the member and the state in which the jet nozzle is opened, it is possible to prevent clogging of the jet nozzle with earth and sand. Other effects similar to those of claim 1 or 2 are achieved.

According to the fourth aspect of the present invention, the movable rod is switched to the advanced position, and while the cutter disk of the second shield machine is rotated, the cleaning water is sprayed from the spray nozzle onto the outer peripheral surface of the hood section, and the hood section is sprayed. Since the earth and sand adhering to the outer peripheral surface of the hood is removed, cleaning water can be sprayed over the entire circumference of the outer surface of the hood, so that the outer surface of the hood can be completely cleaned. In addition, the same effect as that of any one of claims 1 to 3 is achieved.

[0060]

According to the fifth aspect of the present invention, the cutter disks of the first and second shield excavators are provided with telescopic cutter members, and these can be switched between the expanded state and the reduced state for excavation. At the time of shield excavation, these telescopic cutter members can be excavated in a diameter-expanded state, and at the time of underground bonding, the telescopic cutter members can be switched to a diameter-reduced state and then bonded. In addition, the same effect as that of the first aspect is provided .

According to the invention of claim 6 , the first shield machine has at least the cutter disk, the cutter driving means and the partition wall which can be moved backward by a predetermined distance with respect to the first barrel member. In the case of the underground joining type, the hood portion of the second shield machine is attached to the first barrel member while the cutter disk and the cutter driving means are moved backward relative to the first barrel member by a predetermined distance. It can be penetrated into the front end and joined underground. In addition, the same effect as in claim 5 is obtained.

According to the invention of claim 7 , the first shield machine is provided with a plurality of hydraulic jacks for driving the cutter disk, the cutter driving means and the partition wall backward.
At the time of underground connection, the cutter disk, the cutter driving means, and the partition can be retracted while the large soil water pressure acting on the partition is supported by the plurality of hydraulic jacks. In addition, the same effect as in claim 6 is obtained.

According to the eighth aspect of the invention, since the water stop seal is provided on the inner peripheral portion of the front end portion of the first body member of the first shield machine, the front end portion of the first body member is connected to the second shield member. In the state of being fitted onto the hood portion of the excavator, water can be surely stopped by the water stop seal between the first body member and the hood portion. In addition, the same effect as that of any one of claims 1 to 7 is achieved.

[Brief description of drawings]

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

FIG. 2 is a front view of a first shield machine.

3 is a vertical cross-sectional view of a first shield machine, the left half shows a section taken along the line aa of FIG. 1, and the right half shows the section taken along the line bb of FIG.

FIG. 4 is a vertical cross-sectional view of a main part including a water sealing mechanism (stored state).

FIG. 5 is a vertical cross-sectional view of a main part including a water sealing mechanism (sealed state).

FIG. 6 is a vertical sectional view of a second shield machine.

FIG. 7 is a front view of a second shield machine.

8 is a vertical cross-sectional view of a second shield machine, the left half shows a cross section taken along line cc of FIG. 6 and the right half shows a cross section taken along line dd of FIG.

FIG. 9 is a vertical cross-sectional view of the cleaning device (movable rod retracted state).

FIG. 10 is a vertical cross-sectional view of a cleaning device (movable rod advancing state).

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

FIG. 12 is a vertical cross-sectional view of first and second shields (underground joint state).

FIG. 13 is a vertical cross-sectional view of a cleaning device (movable rod retracted state) according to a modification.

FIG. 14 is a vertical cross-sectional view of the main parts of the cleaning device (movable rod advancing state).

FIG. 15 is an enlarged view of a main part of FIG .

[Explanation of symbols]

1 1st shield excavator 2 2nd shield excavator 10 1st body member 11,51 Cutter disk 13,53 Chamber 14,54 Partition wall 15 Water stop sealing mechanism 22,62 Cutter spoke 25,65 Telescopic cutter member 50 Second body Member 75 Hood 81 Spoke Member 82 Movable Rod 83 Hydraulic Cylinder 90,100 Injection Nozzle 91,101 Plug Member 102 Hydraulic Cylinder

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takehiko Kumabe 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Within Kashima Construction Co., Ltd. (72) Inventor Mitsuo Shimizu 8 Niijima, Harima-cho, Kako-gun, Hyogo Kawasaki Heavy Industries Harima Factory (72) Inventor Yasumi Sato 8 Niijima, Harima-cho, Kako-gun, Hyogo Kawasaki Heavy Industries, Ltd. In-house Harima Factory (72) Yasunori Kondo 8 Niijima, Harima-cho, Hyogo Prefecture Kawasaki Heavy Industries, Ltd. Harima Factory (56) Reference JP 2000-154694 (JP, A) JP 2000-265781 (JP, A) JP 4-312697 (JP, A) Patent 2574977 (JP, B2) (58) Survey Areas (Int.Cl. ⁷ , DB name) E21D 9/06 301 E21D 9/08

Claims (8)

(57) [Claims] 1. An underground junction type shield excavator comprising first and second shield excavators, wherein both shield excavators are excavated in a direction of approaching each other to be joined underground. The excavator has a first barrel member, a cutter disc, and a cutter driving means, and the second shield excavator has a second barrel member, a cutter disc, and a front end portion of the first barrel member that is loosely fitted to the outside. It has a ring-shaped hood part that can be fitted and extends forward from the front end of the second body member, and has advanced to the spoke member of the cutter disk of the second shield machine, partially advancing to the larger diameter side than the hood part. A movable rod that can be switched between a position and a retracted position where the movable member is retracted into the spoke member, and an advance / retreat drive unit that drives the movable rod to advance / retreat. On the outside An underground junction shield machine with an injection nozzle for injecting cleaning water. 2. The underground junction shield machine according to claim 1, wherein the second shield machine is provided with cleaning water supply means for supplying high-pressure cleaning water to the injection nozzle. 3. A plug member capable of closing the injection nozzle,
The underground junction shield machine according to claim 1 or 2, further comprising an opening / closing drive means capable of driving the stopper member to open / close. 4. When the two shield excavators are ground-joined, the movable rod is switched to the advance position and the cutter disk of the second shield excavator is rotated while cleaning water is sprayed from the injection nozzle onto the outer peripheral surface of the hood portion. The underground junction shield machine according to any one of claims 1 to 3, wherein the soil is attached to the outer peripheral surface of the hood to remove the soil. 5. The cutter spoke of the cutter disk of the first shield machine has an extendable cutter member that can be switched between an expanded diameter state for excavation and a reduced diameter state in which the diameter is smaller than that of the first body member. cutter spoke 2 shield machine cutter disc claim 1, further comprising a switchable telescopic cutter member on the expanded state of the drilling and reduced diameter state in which smaller diameter than the first cylinder member underground junction shield machine according to. 6. The first shield machine includes at least a cutter disk, a cutter driving means, and a chamber.
The underground junction shield machine according to claim 5 , wherein the partition wall for partitioning the partition is configured to be movable backward with respect to the first body member by a predetermined distance. To wherein said first shield machine, according to claim, characterized in that a plurality of hydraulic jacks for reverse drive and the cutter disk and the cutter drive means and the partition 6
Underground junction type shield machine described in. 8. A front end portion of the first trunk member is provided with a second end portion on an inner peripheral portion of a front end portion of the first trunk member of the first shield machine.
The underground according to any one of claims 1 to 8 , wherein a waterproof seal is provided to stop water between the first body member and the hood in a state of being fitted onto the hood of the shield machine. Junction type shield machine.