JP2000337081A - Underground joint type shield machine and method for joining the same underground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide underground joint type shield machines whose manufacturing cost can be reduced by reducing the length of the receiving shield machine, and simplifying its structure and to provide an underground joining method. SOLUTION: The inner barrel 11 of a first shield machine 1A is fixed to an outer barrel 10 and each shield jack 7 is fixed to the outer barrel 10. A bulkhead member 12 is fixed to the inner barrel 11 and cutter discs 3, 60 are brought close to each other in an opposite relationship. Next, in the first shield machine 1A each shield jack 7 is connected to the inner barrel 11 and removed from a ring web 32, and then each fixing member 30 is removed while each shield jack 7 is held extended; then each shield jack 7 is contracted and the cutter disc 3, the inner barrel 11 and the bulkhead member 12 are moved backward to fit the cutter disc 60 of a second shield machine 1B into the front end portion of the outer barrel 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground jointed shield excavator and a method of joining the same underground, and more particularly, to a technology for simplifying an internal structure of a shield excavator and reducing manufacturing costs.

[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.

[0003] In a tunnel formed underground in an urban area, it is often impossible to form a shaft because the structures are congested on both the underground and underground. Therefore, two shield excavators of the same diameter or different diameters must be connected from the separation point. Dig in the approaching direction and finally 2
Various techniques for joining the front ends of two shield excavators underground have been proposed and put to practical use (Japanese Patent Laid-Open No. 8-12737).
No. 7, JP-A-8-158783).

Japanese Patent Application Laid-Open No. 8-127377 discloses that
An underground joint type shield excavator that joins two shield excavators underground is described, and the first shield excavator on the receiving side is:
A body member (consisting of an outer body and an inner body), a cutter disk, a cutter driving mechanism, a plurality of shield jacks,
A plurality of retracting jacks for retracting the cutter disk, the inner body, the cutter driving mechanism, etc. with respect to the outer body by a predetermined distance;
An elongated spacer or the like interposed between the partition member for supporting the cutter disk and each shield jack is provided. The second shield excavator on the penetrating side includes a trunk member, a cutter disk, a cutter drive mechanism, a plurality of shield jacks, and the like. It has.

According to the first and second shield excavators, in the first shield excavator, a plurality of spacers are removed, and the cutter disk, the inner body, the cutter driving mechanism and the like are moved relative to the outer body by a plurality of retraction jacks. After retreating a predetermined distance, the front end portion of the second shield excavator can be fitted inside the front end portion of the outer shell of the first shield excavator to join the two shield excavators underground.

[0006] Japanese Patent Application Laid-Open No. 8-158783 also discloses that
An underground joint type shield excavator that joins two shield excavators underground is described, and the first shield excavator on the receiving side is:
An integrated shield excavator having no bent part, comprising a trunk member (including an outer trunk and an inner trunk), a cutter disk, a cutter driving mechanism, a plurality of shield jacks, and a cutter disk fixed to the inner trunk. A second shield excavator on the penetrating side includes a trunk member including a protective cylinder, a water-blocking seal mechanism, a cutter disk, a cutter drive mechanism, a plurality of shield jacks, a plurality of pairs of folding jacks, and the like. It has.

According to the double shield machine described in Japanese Patent Application Laid-Open No. 8-158783, in the second shield machine, the protective cylinder is retracted to expose the water stop seal mechanism, and in the first shield machine, each shield jack is removed. The rear end of the spreader is connected to the front end of the reinforced segment, and the connection between the partition member and the outer shell is released. Then, each shield jack is switched to the contracted state, the inner trunk, the partition member, the cutter disk, and the cutter drive mechanism are retracted with respect to the outer trunk,
The second shield machine can then be advanced gradually to join both shield machines underground.

[0008]

SUMMARY OF THE INVENTION Problems to be Solved by the Invention
In the underground junction type shield machine described in Japanese Patent Publication No. 77, a spacer must be interposed between the partition wall member and the shield jack, and the length of the shield machine becomes longer, and the shield machine becomes larger. There is a problem. Further, since a plurality of retracting jacks are required for retreating the cutter disk, the inner body, and the cutter driving mechanism with respect to the outer body by a predetermined distance, the manufacturing cost of the shield machine becomes high.

On the other hand, in the underground junction type shield machine described in Japanese Patent Application Laid-Open No. 8-158783, although the above-described spacer and a plurality of lead-in jacks are not required for the first shield machine on the receiving side, the first shield machine is used. Nothing is disclosed about the case where the machine is a mid-fold type shield excavator, specifically, means for connecting the jack body and the inner body of the shield jack, and the retreated inner body and the partition member The receiving mechanism is not described.

[0010] An object of the present invention is to reduce the length of the shield excavator on the receiving side, simplify the internal structure of the shield excavator, and reduce the manufacturing cost in an underground junction type shield excavator. is there.

[0011]

According to a first aspect of the present invention, there is provided an underground joining method for an underground junction type shield excavator, wherein the first and second shield excavators are excavated in a phase approaching direction and are joined underground. In the joining method, in the first shield excavator, the inner body fitted in the outer body is fixed to the outer body in a releasable manner and a plurality of shield jacks are fixed to the outer body in a releasable manner. A first step of fixing a partition member for supporting the cutter disk to the first and second shield excavators so that both cutter disks approach and face each other; and a plurality of shield jacks in the first shield excavator. And a second step of releasing the fixation of the shield jacks to the outer body and releasing the fixation of the inner body to the outer body in a state where the plurality of shield jacks are extended. A third step of retreating the cutter disk, the inner shell and the partition member by a predetermined distance with respect to the outer shell by switching the do jack into a contracted state; and a second shield in parallel with the third step or after the third step. And a fourth step of internally fitting the cutter disk of the excavator to the front end portion of the outer shell of the first shield excavator.

At the time of underground joining, first, the first and second shield excavators are brought closer to a state where both cutter discs approach and face each other. The muddy water is stored in each chamber, and the spreader connected to the tip of the rod of each shield jack of the first shield excavator is connected to the tip of the reinforced segment with, for example, a bolt. Then, the jack bodies of the shield jacks are respectively connected to the inner body, and the fixing of the shield jacks to the outer body is released. After that, the inner disk is released from the outer shell, and the shield jacks are switched to the contracted state with the middle bend jacks removed. Let it.

After the cutter disk, the inner shell and the partition member are retracted by a predetermined distance or in parallel, the entire second shield excavator is gradually advanced to remove the cutter disk from the first shield excavator. The two shield excavators can be joined underground by being fitted inside the front end of the outer shell of the excavator. In particular, in the third step, by releasing the fixing of the inner shell to the outer shell in a state where each shield jack of the first shield excavator is extended, the cutter disc and the inner shell can be fixed by the soil water pressure acting on the front surface of the shield excavator. The partition member can be easily retracted. Therefore, a plurality of retraction jacks as in the conventional publication are not required. In addition, after releasing the fixing of each shield jack to the outer body, by switching these shield jacks from the extended state to the contracted state, a predetermined distance for retreat can be secured, so that the elongated body is elongated as in the conventional publication. Spacers (for a predetermined distance) are not required.

According to a second aspect of the present invention, there is provided an underground shield type shield machine.
An underground joint type shield excavator having a first shield excavator on a receiving side and a second shield excavator on a penetrating side, wherein both shield excavators are excavated in a phase approaching direction and joined underground. Wherein the first shield machine comprises a trunk member, a cutter disk, a cutter driving means, and a plurality of shield jacks, wherein the trunk member has an outer trunk and a partition wall fitted in the outer trunk and supporting the cutter disk. A plurality of jack fixing mechanisms having an inner trunk fixed to the member and releasably fixing the plurality of shield jacks to the outer trunk, and a plurality of releasably fixing the outer trunk and the inner trunk during shield excavation A plurality of connecting tools for respectively connecting the plurality of shield jacks and the inner body at the time of underground joining, the second shield excavator includes a body member, a cutter disk, cutter driving means, and a plurality of And a plurality of telescopic spokes which can be radially expanded and contracted in order to fit the cutter disk into the front end portion of the outer shell of the first shield machine in the case of underground joining. It is characterized by the following.

When joining both shield excavators underground,
When the first and second shield excavators, which have been excavated in the phase approaching direction, reach the joining position while their axes are substantially aligned and the positional relationship between the two shield excavators is confirmed, the first shield excavator Is stopped, and the second shield machine is temporarily stopped. Then, in the first shield machine, the spreader of each shield jack is connected to the tip of the foremost reinforced segment with, for example, bolts,
The jack body and the inner body of each shield jack are connected by a connector, and each shield jack is set in a fixed release state by a plurality of jack fixing mechanisms.

Next, the fixing of the outer shell and the inner shell is released by each fixing member in a state where each shield jack is extended, and a plurality of pairs of bent-in jacks and the like are removed almost in parallel with this. Then, the cutter disc, the inner shell, and the partition member can be retracted by a predetermined distance with respect to the outer shell due to the soil pressure acting on the front surface of the first shield machine. At this time, by switching each shield jack from the expanded state to the contracted state, the retreat speed is controlled. In parallel with or after the retreating operation, the telescopic spokes of the second shield excavator are switched to the reduced diameter state, and the entire second shield excavator is gradually advanced, and the cutter disk is moved to the first shield excavator. The two shield excavators can be joined underground by being fitted inside the front end of the outer shell of the vehicle.

According to a third aspect of the present invention, there is provided an underground shield type shield machine.
In the invention according to claim 2, a plurality of shield jacks are released in a state where the plurality of shield jacks and the outer body of the first shield excavator are unlocked and the plurality of shield jacks and the inner body are connected at the time of underground joining. Is switched from the extended state to the contracted state, whereby the inner trunk, the partition member and the cutter disk are switched to a state in which the inner trunk, the partition member and the cutter disk are retracted by a predetermined distance with respect to the outer trunk. Therefore, if the extension stroke of the shield jack is set to a predetermined distance in advance, the inner trunk, the partition member, and the cutter disk can be retracted by the stroke.

According to a fourth aspect of the present invention, there is provided an underground shield type shield machine.
In the invention of claim 3, the cutter disk of the first shield excavator is provided with a plurality of expandable and contractible spokes that can expand and contract in the radial direction in order to retract the cutter disk with respect to the outer shell during underground joining. It is a feature. Therefore, after switching these extendable spokes to the contracted state, the cutter disk can be retracted with respect to the outer shell.

According to a fifth aspect of the present invention, there is provided an underground shield type shield machine.
The invention according to any one of claims 2 to 4, wherein a plurality of stopper members are provided on an inner surface side of the outer shell of the first shield excavator to receive the inner shell and the partition member that are retracted during underground joining. It is characterized by the following. Therefore, the retracted inner body and the partition member can be reliably received.

According to a sixth aspect of the present invention, there is provided an underground junction type shield machine.
The invention according to any one of claims 2 to 5, wherein the outer shell of the first shield excavator is internally fitted to the inner surface of the front end of the outer shell at the time of underground bonding. A watertight seal mechanism for stopping water between the cutter disk of the second shield machine and the cutter disk is provided. Therefore, the water blocking can be stopped by exposing the water blocking seal mechanism by retracting the inner trunk by the shield jack.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. This underground junction type shield excavator has a first shield excavator 1A on the receiving side and a second shield excavator 1B on the penetrating side, and makes these two shield excavators 1A and 1B excavate in a phase approaching direction. To join them underground. First, the first shield excavator 1A on the receiving side will be described. However, the following description also includes the description of the underground joining method of the underground joining type shield machine.

As shown in FIG. 1, the first shield machine 1
A is a trunk member 2, a cutter disk 3 provided on the front end side of the trunk member 2, a cutter driving mechanism 4,
, A plurality of pairs of bent jacks 6, a plurality of shield jacks 7, an erector device 8, a sludge discharging facility 9, and the like. The trunk member 2 has an outer trunk 10 and an inner trunk 11, and the outer trunk 10 has a front trunk 10a, and a rear trunk 10b connected to the front trunk 10a via the center bent part 5, The inner trunk 11 is fixed to a partition member 12 that is slidably fitted in the front trunk 10 a in the front-rear direction and that supports the cutter disk 3.

The cutter disk 3 has a center frame 13 and a plurality of cutter spokes 14 extending radially from the center frame 13, and each cutter spoke 14 has a telescopic spoke 15 provided on an outer peripheral portion thereof. I have. These telescopic spokes 15 are configured to be switchable between an expanded state for excavation and a reduced state in which the diameter is smaller than that of the trunk member 2 by an internal hydraulic cylinder 16. A number of cutter bits 17 are fixed to each of the cutter spokes 14 and the extension spokes 15.

As shown in FIG. 1, an annular cutter drum 19 is integrally connected to the rear ends of the plurality of cutter spokes 14 via a plurality of connecting frames 18. The cutter driving mechanism 4 for rotating and driving the cutter disk 3 includes a plurality of hydraulic motors 4 a and a pinion gear 20.
And a pinion gear 20 of the output shaft of the hydraulic motor 4 a meshes with the gear teeth of the ring gear 21.

The rear side of the cutter disk 3 inside the front body 10 a is provided with a chamber 22 through a partition member 12.
The partition member 12 is provided with the cutter drum 1.
9 and the hydraulic motor 4a are mounted. Partition member 12
Has a central wall 23, an inner cylindrical wall 24, an annular wall 25, and an annular box frame 26 fixed to the vicinity of the outer periphery and the outer peripheral edge of the front surface of the annular wall 25. The inner body 11 is welded to the outer peripheral edge.

In order to rotatably support the cutter disk 3 on the partition member 12, the cutter drum 19 has an inner cylindrical wall 24.
The cutter drum 19 is rotatably mounted in an annular space between the box and the box frame 26, and a plurality of seal members and bearings are mounted on both inner and outer sides of the cutter drum 19. Each hydraulic motor 4a is fixed to the annular wall 25. A rotary joint 27 is fixed to the center wall 23 in a rearward direction, and a sludge pipe 9a and a water supply pipe 9b of the sludge facility 9 are fixed to the box frame 26, and the chamber 22 is located near the sludge pipe 9a. A stirrer 28 for stirring the mud is attached. Note that a plurality of oil passages and the like for supplying hydraulic pressure to the hydraulic cylinder 16 of each telescopic spoke 15 are provided inside the rotary joint 27 and the center member 29.

As shown in FIG. 1, the box frame 26
A plurality of triangular fixing members 30 are provided at appropriate intervals around the outer periphery of the rear surface and the inner peripheral surface of the outer shell 10, and each of the fixing members 30 is provided on the box frame 26 and the outer shell 10. It is releasably fixed by bolts.

As shown in FIGS. 1 and 3, ring webs 31 and 32 are welded to the inner surface of the front end of the rear body 10b, and a flange 33 extends over the inner peripheral edge of the ring webs 31 and 32. Is fixed. The plurality of shield jacks 7 are disposed rearward and at appropriate intervals in the circumferential direction, and each shield jack 7 is provided with a ring web 31, 32.
And is fixed to the ring web 32 with a plurality of bolts. That is, the ring webs 31, 32, the flange 33, and the plurality of bolts correspond to a plurality of jack fixing mechanisms.

At least on the outer peripheral surface of each shield jack 7 near the ring web 32, a pair of flat portions on the left and right as viewed from the front of the shield jack 7 is provided.
Are formed in parallel to each other at a width of about 1/2 of the diameter of each of them, and form a two-plane width. The flat portion and the ring web 32 restrain each shield jack 7 from rotating around its axis.
Therefore, each shield jack 7 is configured to be movable in the front-rear direction while being penetrated by the ring webs 31 and 32 by removing the bolts, and can be completely removed from the ring webs 31 and 32.

A spreader 35 is loosely connected to the distal end of the rod of each shield jack 7 via an eccentric fitting 34. The rear end of the spreader 35 and the foremost uncovered segment S are a plurality of pieces. It is configured to be connectable by bolts. At the time of normal excavation, the spreader 35 and the reinforced segment S are disconnected from each other, and by contacting the spreader 35 with the front end of the reinforced segment S, the reaction force against the propulsive force of the shield jack 7 is reduced. To take.

As shown in FIGS. 1, 3, and 7 to 9, at the time of underground joining, the spreader 35 and the reinforced segment S are connected to each other.
Near the outer periphery of the rear surface of the box frame 26, that is, the inner trunk 11
And are connected by a connecting tool 36.
Both ends of the connecting member 36 are pin-connected to both the shield jack 7 side and the box frame 26 side. Outer body 10
A plurality of stopper members 37 for receiving the inner trunk 11 and the partition wall member 12 which are relatively retracted with respect to the outer trunk 10 at the time of underground joining interfere with the plurality of shield jacks 7 at the rear end portion on the inner surface side. It is welded and joined at appropriate intervals in the circumferential direction so as not to occur.

As shown in FIG. 1, FIG. 3 and FIG.
a on the inner surface of the front end portion,
The water-stop seal mechanism 38 stops water between the front body 10a and the cutter disk 60 of the second shield machine 1B that is fitted inside the front end of the front body 10a during underground joining. It has become. This water stop seal mechanism 38
Is a well-known watertight seal mechanism, and includes an annular concave portion 39 recessed on the inner surface of the front body 10a, an annular elastic membrane member 40,
Annular seal member 41, front body 10a and annular elastic membrane member 4
It is composed of a pressurized water injection mechanism including a pressurized water injection pipe for injecting pressurized water between 0 and 0.

As shown in FIG. 1, the erector device 8
It has an erector base frame 43, an erector main body 42, an erector turning motor 44, and the like. The erector base frame 43 is formed in a ring shape, and is rotatably supported by a plurality of rollers 46 pivotally mounted on a bracket 45 fixed to a rear end portion of an inner peripheral portion of the flange 33. An elector turning motor 44 is fixed to a support bracket 48 joined to the inner surface front end of the flange 33, and a sprocket 49 fixed to the motor shaft is attached to the outer front end of the erector base frame 43. The erector base frame 43 can be driven to rotate forward and backward by being engaged with the endless chain 47.

The erector main body 42 has an erector base frame 43.
The support bracket 48 is fixed to the rear end face with bolts.
One end of a center-folding jack 6 is swingably supported at the upper end of the jack. Reference numeral 50 indicates a perfect circle holding device, and reference numeral 51 indicates a tail grout seal.

Next, the penetrating side second shield excavator 1B will be described. However, in the excavation direction, the front, rear, left and right are described as front, rear, left and right, and the second shield excavator 1B has substantially the same configuration as the first shield excavator 1A.
The same members as those of the first shield machine 1A are denoted by the same reference numerals, and the description thereof will be appropriately omitted. The configuration different from that of the first shield machine 1A will be described.

As shown in FIG. 2, the second shield machine 1
B is an integrated shield excavator having no bent portion, and includes a body member 61, a cutter disk 60, a cutter driving mechanism 4, a partition wall 62, a plurality of shield jacks 63, an erector device 8, a mud discharging facility 9, and the like. Having. However, since there is no need to move the cutter disk 60, the cutter driving mechanism 4 and the like backward and rearward with respect to the body member 61, there is no equivalent to the inner body 11, and each shield jack 63 and the partition wall 62 are connected. No connecting tool is provided, and there is no need to connect the rear end of the spreader 35 and the foremost reinforced segment S. Further, since there is no need to receive the partition 62, a stopper member corresponding to the stopper member 37 is not provided. A plurality of connecting members 64 are fixed at appropriate intervals in the circumferential direction between the ring web 32 and the partition wall 62 so that the load can be transmitted.

The partition 62 has a central wall 65, an inner cylindrical wall 66, an annular wall 67, and an annular L-shaped frame 68. Is welded to the vicinity of the front end. As shown in FIGS. 2 and 4, the cutter disc 60 is welded to a center frame 69, a plurality of cutter spokes 70 extending radially from the center frame 69, and an outer peripheral edge of a rear wall of the cutter spokes 70. And the torso member 61
Has a seal member 71 and an annular ring member 72 rotatably mounted via bearings. A telescopic cutter 15 is provided on the outer peripheral portion of each cutter spoke 70, and these telescopic cutters 15 are configured to be able to expand and contract in the radial direction.

As shown in FIG. 4, a water-blocking ring 73 (see FIG. 4) having a rectangular cross section is welded between the rear end of the ring member 72 and the trunk member 61 during underground welding. Further, a backfill material injection hole 72a for injecting a backfill material such as mortar is formed at a position slightly forward of a place where the seal member 71 is provided on the ring member 72, and the backfill material injection hole 72a is formed. The backfill material injection pipe 74 is attached to the back.

Next, the two shield excavators 1A, 1B are excavated in the direction of approaching each other, and the two shield excavators 1A, 1B are excavated.
Underground joining method for joining underground will be described. FIG.
As shown in FIG. 1, in the first step, the first and second shield excavators 1A and 1B which have been excavated in the approaching direction are aligned so that their axes are substantially coincident with each other, and both shield excavators 1A and 1B are
The first shield excavator 1A is stopped and the second shield excavator 1B is temporarily stopped when reaching the joining position shown in FIG. 5 while confirming the positional relationship of 1B using a known horizontal boring 75.

Next, as shown in FIG. 6, stone blocks, earth blocks and the like in the chambers of the first and second shield machines 1A and 1B are washed and removed, and muddy water is stored in each chamber. Next, FIG.
As shown in (2), in the second step, the spreader 35 connected to each shield jack 7 of the first shield excavator 1A is connected to the tip end of the foremost reinforced segment S by a bolt, and The jack body and the box frame 26 are connected with the connecting tools 36, respectively. Then, the fixing of the shield jacks 7 to the ring webs 31, 32 and the flange 33 is released by removing a plurality of bolts.

Next, as shown in FIG. 7, in a third step, the respective fixing members 30 are removed in a state where the respective shield jacks 7 of the first shield machine 1A are extended and the outer shell 10 and the inner shell 11 are connected. The fixing is released, and a plurality of pairs of the bent jacks 6 are removed almost in parallel with this. Next, the plurality of telescopic spokes 15 are switched to a reduced diameter state, and thereafter, as shown in FIG. 8, by the soil water pressure acting on the front surface of the first shield machine 1A,
The cutter disc 3, the inner shell 11, and the partition member 12 are connected to the outer shell 1
Then, the partition member 12 is retracted by a predetermined distance from 0, and finally the partition member 12 is brought into contact with the plurality of stopper members 37. At this time, the retreat speed is controlled by synchronously switching all the shield jacks 7 from the extended state to the contracted state. In parallel with or after the retreating operation, the telescopic spokes 15 of the second shield machine 1B are switched to the reduced diameter state, and the following fourth step is performed.

That is, as shown in FIGS. 8 and 9, in the fourth step, the cutter disk 60 of the second shield machine 1B is fitted inside the front end of the outer shell 10 of the first shield machine 1A. Thereafter, in the water stop seal mechanism 38 of the first shield machine 1A, pressurized water is supplied from the pressurized water injection mechanism to expand the elastic membrane member 40, and the annular seal member 41 is provided.
Is pressed against the outer peripheral surface of the ring member 72 of the cutter disk 60 of the second shield machine 1 </ b> B to make the water stop state. Next, the plurality of backfill material injection pipes 7 of the second shield machine 1B
Inject backfill material such as mortar into the ground side from Step 4. Then, as shown in FIG. 4, the water stop ring 73 of the second shield machine 1B is welded.

As shown in FIG. 10, after the backfill material is solidified, the outer shell 10 of the first shield machine 1A and the body member 61, the ring member 72, etc. of the second shield machine 1B are placed underground. Remove the internal structure including internal devices and structural members while leaving them.

According to the underground joining type excavating machine (1A, 1B) and the underground joining method described above, in the second step, the plurality of shield jacks 7 of the first shield excavating machine 1A are connected to the connecting members 36 and the like. And the fixing of the shield jacks 7 to the outer shell 10 is released, and in the third step, the respective fixing members 30 are removed while the shield jacks 7 are extended, and the outer shell 10 is removed.
And the inner shell 11 are released, and the cutter disk 3, the inner shell 11, and the partition member 12 are retracted by a predetermined distance from the outer shell 10 by the soil pressure acting on the front surface of the first shield machine 1A. Therefore, it is not necessary to provide an expensive lead-in jack as in the conventional publication, and the production cost can be reduced.

Therefore, the internal structure of the first shield machine 1A can be greatly simplified, and the manufacturing cost of the first shield machine 1A can be reduced. Since the shield jacks 7 are released from being fixed to the outer shell 10 and then switched from the extended state to the contracted state in synchronization with each other, a predetermined distance for retreat can be secured. Such a spacer (equivalent to a predetermined distance) is not required, so that the space can be used effectively and the length of the machine can be shortened.

At the time of underground joining, a plurality of shield jacks 7
And a plurality of connecting members 36 for connecting the inner shell 11 and the inner shell 11, respectively, so that the shield jack 7 for generating the digging thrust is provided.
Can also be used to control the retreat speed of the cutter disk 3, the inner body 11, and the partition member 12.

A plurality of telescopic spokes 15 that can be expanded and contracted in the radial direction are connected to the cutter disk 3 of the first shield machine 1A.
, The cutter disk 3 can be retracted with respect to the outer shell 10 after switching these extendable spokes 15 to the contracted state. The plurality of stopper members 37
Since it was provided on the inner side of the outer shell 10 of the shield machine 1A,
The retracted inner trunk 11 and partition member 12 can be reliably received. When the shield jacks 7 are maximally contracted, the partition member 12 abuts against the stopper members 37, so that the subsequent removal work of the internal devices and the like can be performed more safely.

Since the watertight seal mechanism 38 is provided on the inner surface of the front end portion of the outer shell 10 of the first shield machine 1A, the inner shell 11 is retracted by the shield jack 7 so that the watertight seal mechanism 38 is formed. It can be operated with exposure. In this way, the water stop seal mechanism 38 can be made compact, and the water can be reliably and easily stopped between the water shield seal mechanism 38 and the cutter disc 60 of the second shield machine 1B fitted inside the front end of the outer shell 10. .

Next, a modified embodiment in which this embodiment is partially modified will be described. 1) The first shield excavator 1A on the receiving side may be an integrated shield excavator without a center bend. In this case,
For example, each shield jack and the inner trunk may be loosely pin-connected in advance without using the above-described connecting tool 36 at the time of underground joining. Other fixing member 3 of the above embodiment
The same functions and effects as those of the above-described embodiment can be obtained by adopting substantially the same configuration as that of the first embodiment, the ring web 32, the stopper member 37, the water stop seal mechanism 38, and the like.

2) During the process of underground joining, internal equipment and a part of the internal structure may be removed as necessary, or internal equipment may be introduced. 3) In the present embodiment, a muddy water discharge facility is employed, but an earth pressure discharge equipment can also be applied. In addition, without departing from the spirit of the present invention, it is also possible to implement the above-described embodiment with various modifications.

[0051]

According to the first aspect of the present invention, in the second step, the plurality of shield jacks of the first shield machine are respectively connected to the inner body, and the fixing of the shield jacks to the outer body is released. In the third step, the fixing of the inner shell to the outer shell is released in a state where each shield jack is extended, and thereafter, the cutter disk, the inner shell, and the partition member are separated by the soil water pressure acting on the front surface of the first shield excavator. Since it can be retracted by a predetermined distance with respect to the body, it is not necessary to provide an expensive retraction jack as in the conventional publication, and the production cost can be kept low. Therefore, the internal structure of the first shield machine can be greatly simplified,
The manufacturing cost of the shield machine can be reduced.

By releasing the fixing of the shield jacks to the outer body and switching these shield jacks from the extended state to the contracted state in synchronization, a predetermined distance for retreat can be secured. Such a long and thin spacer is not required, and the space can be used effectively and the machine length can be shortened.

According to the second aspect of the present invention, since a plurality of jack fixing mechanisms are provided, each shield jack can be easily fixed and released from the outer shell, and the underground joining operation can be performed quickly. Since a plurality of connecting tools are provided to connect the multiple shield jacks and the inner body respectively at the time of underground joining, the shield jacks for generating excavation thrust, the retreat speed of the cutter disk, inner body and partition member Can also be used for control.

According to the third aspect of the present invention, by switching the plurality of shield jacks from the extended state to the contracted state, the inner body, the partition member, and the cutter disk are switched to the state in which they are retracted by a predetermined distance with respect to the outer body. be able to. Therefore, if the extension stroke of the shield jack is set to a predetermined distance in advance, the inner trunk, the partition member, and the cutter disk can be retracted by the stroke. Other effects are the same as those of the second aspect.

According to the fourth aspect of the present invention, since a plurality of radially extendable spokes are provided on the cutter disk of the first shield excavator, after switching these retractable spokes to the contracted state, the cutter is used. The disk can be retracted with respect to the outer shell, and interference during underground joining can be prevented. The other effects are the same as those of the third aspect.

According to the fifth aspect of the present invention, since the plurality of stopper members are provided on the inner surface side of the outer shell of the first shield excavator, the retracted inner shell and the partition member can be reliably received. In addition, at the maximum contraction of each shield jack,
If the partition member is brought into contact with each stopper member, the subsequent removal work of the internal device and the like can be performed more safely. In addition, the same effect as any one of the second to fourth aspects is obtained.

According to the sixth aspect of the present invention, since the waterproof seal mechanism is provided on the inner surface of the front end portion of the outer shell of the first shield machine, the inner shell is retracted by the shield jack to stop the water. The sealing mechanism can be exposed and operated. As described above, the water-stop seal mechanism can be made compact, and the water can be reliably and easily stopped between the water-tight seal mechanism and the cutter disk of the second shield excavator fitted inside the front end of the outer shell. In addition, the same effect as any one of the second to fifth aspects is obtained.

[Brief description of the drawings]

FIG. 1 is a vertical 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 enlarged sectional view of a shield jack, a jack fixing mechanism, a connecting member, a stopper member, and the like in FIG. 1;

FIG. 4 is an enlarged sectional view of a main part of a water-blocking seal mechanism and its related structure.

FIG. 5 is an operation explanatory view showing a state in which both cutter disks of the first and second shield excavators approach and face at the time of underground joining.

FIG. 6 is an operation explanatory view showing a joining preparation stage of the first and second shield excavators during underground joining.

FIG. 7 is an operation explanatory view showing a work of switching the fixing of the shield jack of the first shield excavator during the underground joining, releasing the fixing of the inner trunk and the outer trunk and reducing the diameter of the telescopic spokes.

FIG. 8 is an operation explanatory view showing a contracted state of the shield jack of the first shield machine and a contracted state of the telescopic spokes of the second shield machine at the time of underground joining.

FIG. 9 is an operation explanatory view showing an operation state of a water stop seal mechanism of the first shield excavator at the time of underground bonding, a backfill material injection state, and a state of welding connection of the water stop ring.

FIG. 10 is a longitudinal sectional view of the outer shell of the first shield machine and the body member of the second shield machine after the internal equipment and the internal structure are removed.

[Explanation of symbols]

 Reference Signs List 1A First shield excavator 1B Second shield excavator 2, 61 Body member 3, 60 Cutter disk 4 Cutter drive mechanism 7, 63 Shield jack 10 Outer body 11 Inner body 12 Partition member 30 Fixing member 32 Ring web 36 Connector 37 Stopper member 38 Waterproof seal mechanism 73 Waterproof ring

Claims (6)

[Claims] An underground joining method in which first and second shield excavators are excavated in a phase approaching direction and are joined underground. In the first shield excavator, an inner part which is previously fitted in an outer shell is used. A first and a second shield excavator, wherein the body is releasably fixed to the outer body and a plurality of shield jacks are releasably fixed to the outer body, and the inner body is fixed to a partition member supporting a cutter disk. And a second step of connecting a plurality of shield jacks to the inner body and releasing the shield jacks from the outer body in the first shield machine. Releasing the inner shell from the outer shell while the plurality of shield jacks are extended, and switching the shield jack to a contracted state, thereby separating the cutter disc from the inner shell. A third step of retracting the member with respect to the outer shell by a predetermined distance; and simultaneously or after the third step, the cutter disk of the second shield excavator is moved to the front end of the outer shell of the first shield excavator. And a fourth step of in-fitting the shield excavator into a part. 2. An underground connection comprising a first shield excavator on a receiving side and a second shield excavator on a penetrating side, and these two shield excavators are dug in a phase approaching direction and are joined underground. In the shield excavating machine, the first shield excavating machine includes a trunk member, a cutter disk, a cutter driving unit, and a plurality of shield jacks, wherein the trunk member has an outer trunk, a cutter internally fitted to the outer trunk, and a cutter. A plurality of jack fixing mechanisms that have an inner body fixed to the partition member that supports the disk and that can fix a plurality of shield jacks to the outer body so that they can be released, and release the outer body and the inner body during shield excavation A plurality of fixing members to be fixed as possible, and a plurality of connecting members for connecting the plurality of shield jacks and the inner body at the time of underground joining, respectively, wherein the second shield machine comprises a body member, a cutter disk and a cutter drive. Moving means and a plurality of shield jacks, and the cutter disk has a plurality of radially expandable and contractable to fit the cutter disk to the front end portion of the outer shell of the first shield machine during underground joining. Underground junction type shield machine equipped with telescopic spokes. 3. The underground joint, wherein the plurality of shield jacks and the outer shell of the first shield machine are released, and the plurality of shield jacks are extended while the plurality of shield jacks and the inner shell are connected. The underground joint type shield excavator according to claim 2, wherein by switching from the state to the contracted state, the inner trunk, the partition wall member, and the cutter disk are switched to the retracted state with respect to the outer trunk by a predetermined distance. 4. A cutter disk of a first shield machine, wherein a plurality of radially extendable spokes are provided on a cutter disk of the first shield machine so as to retract the cutter disk with respect to an outer shell at the time of underground joining. The underground joint type shield excavator according to claim 3. 5. An inner surface of an outer shell of the first shield machine,
The underground joint type shield excavator according to any one of claims 2 to 4, further comprising a plurality of stopper members for receiving the inner trunk and the partition wall member that are retracted during underground joining. 6. An outer shell of the outer shell of the first shield excavator, and a cutter disk of the second shield excavator which is fitted inside the front end of the outer shell during ground bonding. The underground joint type shield excavator according to any one of claims 2 to 5, further comprising a water-stop seal mechanism for stopping water between the ground excavators.