JP2975568B2 - Shield excavator capable of branch excavation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator capable of branch excavation, that is, a shield excavation in which a tunnel is excavated by a main line shield excavator and the branch shield excavator is branched and started at a branch position in the middle. More particularly, the present invention relates to a main line shield excavator in which the length of the machine is shortened and the structure of a middle body is simplified.

[0002]

2. Description of the Related Art The present applicant has disclosed in Japanese Patent Application Laid-Open No. 8-16588.
As disclosed in JP-A Nos. 3 to 165885, a shield excavator capable of branch excavation as described above has been proposed. In particular, a shield excavator that can branch and excavate as disclosed in Japanese Patent Application Laid-Open No. H8-165883 will be briefly described. This shield excavator of the muddy water shield type has a front trunk, a middle trunk, and a rear trunk. Is equipped with a cutter disk and cutter driving means, a section assembling device is provided inside the rear body, and a bent portion is provided at a rear portion of the front body and at a connection portion between the middle body and the rear body. The middle body has a triple structure over its entire length, and includes an inner body (inner skin plate) in which an innermost branch window is formed and an outer body on the outer side. The outer trunk is slidably fitted to the inner trunk, is connected to the small-diameter connecting trunk member, the rear trunk member fixed to the outer surface side of the rear part of the small-diameter connecting trunk member, and is connected to the front trunk via a bent portion. And a front trunk tail portion (front trunk member) which is slidably fitted to the small diameter connecting trunk member.

Further, each of the front and rear middle bend portions is equipped with a pair of middle bend jacks, a plurality of face-face shield jacks are provided inside a rear portion of the front trunk, and a rear middle bend portion is provided. Inside are a number of shaft-side shield jacks. When excavating the main line tunnel, the piston rods of the plurality of shaft-side shield jacks receive the reaction force of the existing segment to transmit thrust to the inner trunk of the middle trunk, and transmit thrust to the front trunk via the inner trunk to maintain the main trunk. Perform tunnel tunnel excavation. However, after branching in the branch tunnel, the excavation is performed by generating thrust by a plurality of face-side shield jacks. A short cylindrical entrance case forming an entrance passage leading to the branch window hole is fixed inside the inner trunk,
The entrance case is equipped with a branch shield excavator in advance, and a muddy-type earth removal device for muddy excavated earth and sand and discharging the muddy water to the shaft at the base end of the main line tunnel is also provided.

[0004]

In the shield machine capable of branch excavation described in the above publication, an entrance case and a branch shield machine are preliminarily provided inside the inner trunk, so that a shield jack is provided inside the inner trunk. Since it cannot be arranged, the shaft-side shield jack is arranged inside the middle bent portion on the rear side, and the thrust thereof is transmitted to the front body via the small-diameter connecting body member. In this structure, the length of the shield machine is increased, and it is necessary to configure the small-diameter connecting body member to be long over the entire length of the middle body. Therefore, the middle body has a triple structure over its entire length. There is a problem that the structure of the body is complicated.

[0005] As described above, when the length of the shield excavator is increased, the shaft provided at the base end side of the main line tunnel is increased, the excavation resistance of the shield excavator is increased, and the curving performance is reduced. This increases the cost of manufacturing the shield machine. Moreover, since the branch shield excavator is installed in the inner shell in advance, the space in the inner shell becomes narrower, and it becomes impossible to equip the earth discharging equipment such as the earth discharging conveyor. We have to equip the equipment. Therefore, this shield excavator that can branch and excavate can be practically used as a muddy shield excavator, but it is difficult to commercialize it as an earth pressure type shield excavator that discharges excavated earth and sand without muddy water. However, the application of the shield machine is restricted, which is disadvantageous in terms of versatility.
It is an object of the present invention to shorten the length of a shield excavator, to simplify the structure of a middle body, to be applicable to both muddy water shield excavation and earth pressure shield excavation, and the like.

[0006]

According to a first aspect of the present invention, there is provided a shield machine capable of branching and excavating, wherein a front trunk, a middle trunk connected to the front trunk, and a rear trunk connected to a rear end of the middle trunk. And a cutter disk and cutter driving means provided on the front body,
A segment assembling mechanism provided inside the rear trunk,
In a shield excavator capable of branching and excavating a branch shield excavator through a branch window hole formed in an inner trunk of a middle trunk, the middle trunk has an inner trunk and a double cylindrical shape formed in the inner trunk. An outer trunk slidably fitted to the outer trunk, and a front trunk tail connected to the rear end of the front trunk, wherein the outer trunk forms a rear part and has the same outer diameter as the front trunk tail. An outer trunk main body; and an outer trunk inner cylinder portion that extends forward from a front end of the outer trunk main body and is slidably fitted inside the front trunk tail portion in a double cylindrical shape. A first connection mechanism for detachably connecting the front part to the front trunk tail part and a second connection mechanism for detachably connecting the front end part of the outer cylinder inner cylinder part to the front trunk tail part; Is provided so that it can be removed.

In this shield excavator, it is desirable to carry the branch shield excavator into the middle fuselage after reaching the branch point, instead of equipping the branch shield excavator in the middle fuselage in advance. In this case, provisional thrust transmitting members for transmitting the thrusts of the plurality of shield jacks are provided in the middle trunk, and the thrust can be transmitted to the front trunk via the thrust transmitting members. However, it is also possible to equip only a part of the tip end side of the branch shield machine in the middle trunk in advance. The first
The connecting mechanism and the second connecting mechanism are desirably connected via bolts or the like, but these connecting mechanisms may have a structure in which a steel plate wall or a welded connecting part is separated by fusing.

When excavating a main line tunnel, the shield excavator capable of branch excavation excavates an existing segment while kicking an existing segment with a plurality of shield jacks while rotating a cutter disk at a front end of a front body by cutter driving means. I will do it. When arriving at the point where the branch tunnel branches into the middle of the excavation of this main line tunnel, the excavation is stopped, and if not equipped with a plurality of shield jacks in the front fuselage, the plurality of shield jacks are installed in the front fuselage. And the segment assembling mechanism is moved into the front barrel. When the branch shield excavator is not provided, the branch shield excavator is carried into the inner trunk, and the branch shield excavator is set at a predetermined portion facing the branch window.

[0009] Thereafter, after the connection of the first connecting mechanism is separated, the excavation of the main line tunnel is resumed, and the rear body and the inner body of the middle body are stopped by a plurality of shield jacks in the front body. The front body and the outer body of the middle body are advanced to make the branch window of the inner body desired to the ground, and the branch shield excavator starts branch excavation. When the rear end of the outer trunk has advanced to the front end of the inner trunk, the connection of the second coupling mechanism is separated to stop the outer trunk,
Thereafter, the main tunnel is excavated by a shield excavator equipped with a cutter disk, cutter means, and a segment assembling mechanism on the front trunk and the front trunk tail, and the branch tunnel is excavated by a branch shield excavator.

In this shield excavator capable of branch excavation, a plurality of shield jacks are arranged inside the inner trunk of the middle trunk, so that the length of the shield excavator is shortened, and only the front part of the middle trunk has the inner trunk. And the outer trunk inner cylinder part and the front trunk tail part, and the rear part of the middle trunk is a double structure of the inner trunk and the outer trunk main body, so that the structure of the middle trunk is simplified. In addition, a large space in the middle fuselage can be secured by loading the branch shield machine after arriving at the branch point or by installing only the tip of the branch shield machine in advance, so that the earth is discharged from the earth removal conveyor. It becomes possible to equip the equipment, and it is possible to excavate not only the muddy shield but also the earth pressure shield in both the main tunnel and the branch tunnel.

According to a second aspect of the present invention, there is provided a shield excavator capable of branching and excavating, wherein a plurality of thrust transmitting members for transmitting the thrusts of the plurality of shield jacks to the front body are provided inside the inner body. It is characterized by the following. Since the thrust of the shield jacks can be transmitted to the front body through the plurality of thrust transmitting members, there is no need to transmit the thrust through the inner body or the outer body, so the shield is provided inside the inner body of the middle body. A jack can be provided. In addition, Claim 1
It has the same function as.

According to a third aspect of the present invention, there is provided a shield excavator capable of branching and excavating according to the second aspect of the present invention, wherein a short cylindrical entrance case forming an entrance passage communicating with the branch window of the inner body is provided on the inner surface of the inner body. Characterized by being fixed to Thus, since the entrance case is provided in advance, it is not necessary to carry in the narrow main line tunnel after reaching the branch point. The work period for branching can be shortened. When the branch shield machine is carried in after reaching the branch point, the branch shield machine is set in the entrance case. Other effects are the same as those of the second aspect.

According to a fourth aspect of the present invention, there is provided a shield excavator capable of branching and excavating, wherein the thrust transmitting members and the shield jack of each set are arranged in series in front and rear, and a plurality of sets of thrust transmitting are provided. The member and the shield jack are provided so as to penetrate the entrance case. When the branch shield excavator is not set in the entrance case, it is possible to arrange some sets of thrust transmission members and shield jacks so as to penetrate the entrance case, over the entire circumference inside the inner trunk. The thrust transmitting member and the shield jack can be arranged at appropriate intervals. Further, since the thrust transmitting members and the shield jacks of each set are arranged in series in front and rear, the structure of the thrust transmitting system is simplified. In addition, the same operation as the third aspect is achieved.

According to a fifth aspect of the present invention, in the third aspect of the present invention, the branch shield excavator is carried into the inner shell when the branch window reaches the branch position. It is characterized by that. As described above, the branch shield excavator is carried in after reaching the branch position, so that a large work space in the shield excavator can be secured and workability can be improved, which is also advantageous in providing an earth discharging device such as an earth discharging conveyor. It is. In addition, the same operation as the third aspect is achieved.

According to a sixth aspect of the present invention, there is provided a shield excavator capable of branch excavation according to the third aspect of the present invention, wherein the branch shield excavator comprises a plurality of divided bodies. , And are sequentially carried into the inside and assembled. When the branch shield excavator is divided into a front trunk and a rear trunk, the front trunk is first carried in, the branch excavation is carried out a little, and then the rear trunk is carried and connected. When the branch shield excavator is divided into three parts, a trunk part, a center bent part and a rear trunk part, the front part is first carried in, and after branching and excavation a little, the center bent part is carried in and connected. After a little branch excavation, the rear trunk is brought in and connected. In this way, it is possible to cope with a case where the ratio of the diameter of the branch tunnel to the diameter of the main tunnel is large. In addition, the same operation as the third aspect is achieved.

According to a seventh aspect of the present invention, there is provided a shield excavator capable of branching and excavating according to the third aspect of the present invention, further comprising an earth discharging device for discharging the excavated earth and sand without muddy water. As described above, since the excavating device for directly discharging the excavated soil without muddy water is provided, the earth pressure shield excavation can be performed. However, since the earth removal device that excavates and excavates excavated soil is more compact, it is possible to replace the earth removal device with an excavation device that excavates and excavates excavated earth and sand. Excavation is possible and excellent in versatility. In addition, the same operation as the third aspect is achieved.

[0017]

Embodiments of the present invention will now be described with reference to the drawings. The shield excavator capable of branch excavation according to this embodiment excavates the main tunnel of various tunnels (water supply tunnel, sewage tunnel, cable tunnel, various other tunnels) with the main line shield excavator. , When you reach a given junction,
This shield excavator excavates a branch tunnel by branching and starting a branch shield excavator from a branch window hole in the middle trunk, and excavating a main tunnel in parallel with the main tunnel. Incidentally, the main line shield excavator and the branch shield excavator in this embodiment both excavate a tunnel using an earth pressure type shield system, but a shield excavator capable of branch excavation excavating a tunnel using a muddy water type shield system. The present invention can be applied in almost the same manner.

As shown in FIG. 1, a main line shield excavator 1 capable of branching and excavating is connected to a front trunk 2, a middle trunk 3 connected to the front trunk 2, and a rear end of the middle trunk 3. The front body 2 is provided with a cutter disk 5, and the front body 2 is provided with a cutter driving mechanism 6 for driving the cutter disk 5. As the cutter disk 5 and the cutter drive mechanism 6, conventionally known ones can be applied. The cutter disk 5 is driven to rotate forward and reverse by a plurality of motors 6 a of the cutter drive mechanism 6 to excavate the ground of the face of the main line tunnel T.

The rear end of the front body 2 is provided with an electret drum 7b of a segment assembling apparatus, and the front end of the rear body 4 is provided with a segment assembling apparatus 7 (composed of an erector drum 7a and an elector body 7c). After the branch of the branch tunnel Tb, the erector main body 7c of the segment assembling apparatus 7 is attached to the front erector frame 7b to be used as the segment assembling apparatus 7. The rear trunk 4 is provided with a perfect circle holding device 8 for keeping the segment S assembled on the inner surface of the tunnel in a perfect circle shape.
Is moved to a predetermined position on the front side after the branch of the branch tunnel Tb.

The main line shield excavating machine 1 is provided with an earth discharging device 10 for carrying out the excavated earth and sand called a shear excavated by the cutter disk 5 to the ground. The earth discharging device 10 of the present embodiment comprises a main line shield excavating machine. A screw conveyor 10a, a gate 10b, and a screw conveyor 10c provided in the machine 1; and an unloading conveyor (not shown) connected to the rear and extending through the existing main line tunnel T to the shaft at the excavation start end side. I have. Since the earth pressure type shield system is applied, the earth discharging device 10 conveys excavated earth and sand as it is without muddy water. However, when the muddy water shield system is applied, an earth removal device that transports excavated earth and sand in a muddy state is applied.

As shown in FIGS. 1 and 2, a plurality (for example, 20) of shield jacks 11 are provided on the inner peripheral side of the front body 2, and a plurality of (e.g. For example, 1
0) shield jacks 13 are detachably provided, and a plurality of (for example, 20) shield jacks 13 are provided on the inner peripheral side of the front part of the middle body 3.
Of the thrust transmission pipe 12 is detachably provided. The thrust transmission pipes 12 and the shield jacks 13 of each set are arranged in series, and the front shield jack 11 corresponding to the thrust transmission pipes 12 and the shield jacks 13 of each set are also arranged substantially in series. When the main tunnel T is dug before the branch of the branch tunnel, the thrust generated by the rear shield jack 13 is transmitted to the front trunk 2 via the thrust transmission pipe 12 and the front shield jack 11. And the main line shield machine 1 is propelled. In addition, after excavating the main line tunnel T by a predetermined distance after the branch of the branch tunnel,
The thrust transmission pipe 12 and the shield jack 13 are removed, and the main shield shield machine 1 is propelled by the thrust generated by the front shield jack 11.

Next, the inner trunk 3 and the structure related thereto will be described. As shown in FIGS. 1 and 3, the middle body 3 has an inner body 21, an outer body 22 slidably fitted outside the inner body 21 in a double cylindrical shape, and a rear body 2. The front trunk tail portion 23 integrally connected to the end is mainly configured. The outer trunk 22 includes a thick outer trunk main body 24 that forms a rear half thereof, and a double cylindrical shape extending forward from the front end of the outer trunk main body 24 to the inside of the front trunk tail 23. The main body is constituted by an outer trunk inner cylinder part 25 movably fitted inside. A tail seal 2 is provided on the inner surface of the rear end portion of the front trunk tail portion 23.
6 are provided, two annular seals 27 are provided between the front end of the inner body 3 and the outer body inner cylinder part 25, and two annular seals 27 are provided between the rear end of the inner body 21 and the outer body 4. Two annular seals 28 are provided.

An annular rib 29 for attaching the shield jack 11 is provided near the rear end of the front body 2, and an annular connector 30 for connecting the inner body 21 is provided on the annular rib 29. An annular connecting flange 31 is provided at the front end of the inner body 21, and this connecting flange 31 is connected to the annular connecting body 3.
The first connecting mechanism 32 that is separably connected to the connecting member 32 includes a plurality of connecting brackets 32a disposed between the annular connecting body 30 and the connecting flange 31, and a connection with the annular connecting body 30 via the connecting brackets 32a. It is composed of a plurality of bolts and nuts (not shown) for connecting to the flange 31.
Further, a second connection mechanism 3 for detachably connecting the vicinity of the front end of the outer barrel inner cylinder portion 25 of the outer trunk 22 to the inner surface of the front trunk tail portion 23.
Numeral 3 is a thin portion formed by forming an annular groove on the outer peripheral surface of the outer barrel inner cylinder portion 25, and the thin portion is melted from the inside to release the connection of the second connection mechanism 33.

An annular connecting flange 3 is provided at the front end of the rear body 4.
4 is provided, and an annular flange member 35 having a substantially L-shaped cross section is provided at the rear end of the inner body 21 so that the flange member 35 and the connection flange 34 are brought into contact with each other, and the jack body of the shield jack 13 is inserted into these. Mounting flange 13
a, the connection flange 34 and the flange member 3
5 is a shield jack 13 and its mounting flange 13a.
Or separated by a plurality of bolts and nuts. At the tip of the piston rod of the shield jack 13, a spreader 36 for pushing the front end of the segment S on the inner surface of the main line tunnel T backward is provided.

A branch window hole 37 for starting a branch shield machine 40 (see FIG. 17) is formed on the right side wall of the inner trunk 21 of the inner trunk 3 in the direction of excavation. A short cylindrical entrance case 38 forming a horizontal entrance passage 38a communicating with the branch window hole 37 is welded to the inner surface of the body 21 at right angles. The entrance case 38 is mounted on the inner trunk 3 so as not to interfere with the earth removal device 10 and the like arranged in the main line shield machine 1.
Is formed short so as to fit within the width portion of the right side of the inside. In some cases, the branch tunnel Tb is started from a side other than the right side of the main line tunnel T. In this case, both the branch window hole 37 and the entrance case 38 are provided on the side corresponding to the part where the branch starts. A part of the plurality of sets of the thrust transmission pipes 12 and the shield jacks 13 are disposed so as to penetrate the entrance case 38.

Here, the branch window hole 37 is inserted into the main tunnel T
A mechanism for approaching the ground will be described. When the main tunnel T is excavated and the branching hole 37 reaches the branch point, the first connecting mechanism 32 is separated and the main shield excavator 1 is excavated, as shown in FIG. Torso 21
The front and middle shield excavator of the main line shield excavator 1 (including the front torso 2 and its associated facilities, the front torso tail 23 and the outer torso 22) moves forward with the and the torso 4 stopped at the junction. ,
When the branch window hole 37 faces the ground, and then the second connecting mechanism 33 is separated and the shield excavator is excavated, as shown in FIG. The front shield excavator of the shield excavator 1 (including the front fuselage 2, its accompanying equipment, and the front fuselage tail 23) moves forward. In parallel with the above, branch excavation is executed by the branch shield excavator 40 in the branch tunnel.

A process for excavating the main tunnel T with the main line shield excavator 1 described above and branching and excavating with the branch shield excavator 40 from the branch point will be described.
In the first step, as shown in FIG.
When the vehicle reaches the branch point, the main line shield machine 1 is stopped.

In the second step, as shown in FIGS. 7 and 8, a gate 10b between the screw conveyors 10a and 10c is used.
Then, the rear screw conveyor 10c is removed.
In order to prevent the main line shield machine 1 from retreating, the connection flange 34 between the front end of the segment S inside the rear trunk 4 and the rear trunk 4
A plurality of reaction force receivers 41 are mounted in between, and, for example, six reaction force transmission tubes 42 are mounted so as to be located between a serial body in which the thrust transmission tube 12 and the shield jack 13 are serialized.

As described above, after the plurality of reaction force receivers 41 and the six reaction force transmission tubes 42 prevent the main line shield excavator 1 from retreating, all thrust transmission tubes 12 and the rear shield jack are prevented. 13 and then the rear work deck support 9 (see FIG. 1) and the like are removed. Further, the rear erector main body 7c is removed and moved to the front erector frame 7b. Also,
The entrance case 38 has a plurality of holes from which the thrust transmission tube 12 and the shield jack 13 are removed, and the holes are closed by welding blind plates 43 to the holes. After the above preparation work, the cradle 14 is carried in from the outside and set at a predetermined position on the entrance side of the entrance case 38, and then the first split body 40A (the front barrel 44) on the distal end side of the branch shield machine 40 is provided. (Including the cutter disk 45 and the cutter driving mechanism 46) (see FIG. 10) are loaded from the outside, set on the receiving table 14, and arranged to face the entrance case 38.

In the third step, as shown in FIGS. 9 and 10, on the excavation side of the main line shield, a transport facility (see FIG. 12) for carrying in a special segment Sa (see FIG. 12) for lining the inner surface of the main line tunnel T. Consists of a hoist rail 48 and a hoist, etc.), and a temporary earth removal facility (screw conveyor or belt conveyor) for transporting earth and sand excavated by the main line shield machine 1 to an existing earth removal conveyor in the main line tunnel T is installed. . On the other hand, on the branch shield excavation side, the first divided body 40A of the branch shield excavator 40 is moved toward the entrance case 38 by the plurality of temporary shield jacks 49, and the front end portion is inserted into the entrance case 38, and the fixing mechanism 50 (A plurality of connecting hardware and a plurality of bolts and nuts, etc.) are separably fixed to the entrance case 38. In this state, entrance case 3
An entrance packing 39 provided in advance can be operated on the inner surface of the main line 8 at the center side end.

Next, a filler 51 (a muddy agent or muddy water of high clay) is filled in the chamber between the inner body 21 and the first divided body 40A in the space inside the entrance case 38, and the branch shield is provided. A solidifying agent 52 (which is a sealant that can be fluidized later by adding water, etc.) is injected into a tip portion of a screw conveyor 47 that is a part of the earth removal device of the excavator 40. However, as shown in FIG. 11, when the screw conveyor 47A of the earth discharging device of the branch shield excavator 40 has the gate 47B, it is only necessary to shut off the gate 47B without injecting the consolidating agent.

In the fourth step, as shown in FIGS. 12 and 13, on the main line shield excavation side, the connection of the first connection mechanism 32 is released, the front shield jack 11 is operated, and six reaction force transmissions are performed. The excavation is advanced while receiving the reaction force between the pipe 12 and the special segment Sa, and the front middle shield excavator of the main line shield excavator 1 (including the front fuselage 2 and its accompanying equipment, the front fuselage tail 23 and the outer trunk 22) is provided. The rear trunk 4 and the inner trunk 21 are moved forward while stopped, and the branch window hole 37 is opened to the ground. Further, a backfill agent (such as mortar) is injected into the outside of the special segment Sa and the outside of the inner body 21. In this state, the front middle shield excavator is received by the special segment Sa lining the inner surface of the outer shell 22 and does not retreat.

In the fifth step, as shown in FIG.
On the branch shield excavation side, the drive unit 53 is attached to the screw conveyor 47, and so as to follow the drive unit 53,
A temporary earth removal device (a rubber hose connected to the drive unit 53 and a rotary pump) is connected. However, in the case of the screw conveyor with a gate shown in FIG. 11, the gate 47B is opened.
Further, a plurality of reaction force receiving bases 54 that receive the reaction force of the branch shield excavator 40 are attached to the inner surface of the inner trunk 21.

In the sixth step, on the branch shield excavation side, as shown in FIG. 15, the fixing of the fixing mechanism 50 is released, and while the reaction force of the temporary shield jack 49 is received by the reaction force receiving base 54, the branch shield excavation is performed. The first split body 40A of the machine 40 is provisionally started to start excavation of the branch tunnel Tb, excavated for a predetermined distance and then stopped, and the front body 44 is fixed to the entrance case 38 by the fixing mechanism 50. Next, the middle bent portion 55, which is the second divided body 40B of the branch shield excavator 40, is carried in from the outside, and is connected to the front trunk 44 via a partially spherical spherical engagement. The bent part 55
A plurality of shield jacks 56 and a pair of center-bent jacks (not shown) are provided on the inner surface side.

In the seventh step, as shown in FIG.
On the branch shield excavation side, the fixing of the front body part 44 is released,
First and second divided bodies 40A, 4 of branch shield machine 40
0B is temporarily started to excavate the branch tunnel Tb, excavated for a predetermined distance, and then stopped.
To the entrance case 38. Next, the temporary shield jack 49 is removed, and the regular shield jack 56 is switched to an operable state. Then, the rear trunk portion 57 that is the third divided body 40C of the branch shield machine 40 is carried in from the outside, and then the trunk portion 57 is welded to the rear end of the center bent portion 55. Next, the segment assembling device 58 is carried in from the outside and mounted in the rear trunk portion 57. Then, the temporary segment Sb is assembled in the inner trunk 21 by the segment assembling device 58 as necessary. However, an access opening 59 for transportation, equipment transportation, and earth removal transportation is formed in a part of the temporary segment Sb. Note that the temporary segment Sb is
May be provisionally provided with a reaction force receiving member such as a support.

In the eighth step, as shown in FIG.
On the branch shield excavation side, the fixing of the middle bent portion 55 is released, the branch shield excavator 40 is provisionally started, the branch tunnel Tb is dug, and the temporary segment Sb is assembled in parallel with the excavation, and excavation is performed for a predetermined distance. Then, the temporary segment Sb is disassembled and a temporary reaction force receiving member (not shown) is attached. Further, the temporary screw discharging device is removed, the regular screw conveyor 60 is connected, the rear equipment for the branch shield is communicated into the branch tunnel Tb, and other preparation work before the main excavation of the branch shield is completed. FIG. 20 shows the branch shield machine 40 in the branch shield main excavation state.

In the ninth step, as shown in FIGS. 4 and 18, an annular stopper plate 61 is welded to the inner surface near the front end of the outer cylinder inner tube portion 25, and the special segment Sa is joined by the annular stopper plate 61. The front end of the Next, the outer cylinder 2
5 which connects the vicinity of the front end to the front trunk tail 23.
By fusing the thin part of the connecting mechanism 33, the front trunk tail part 23 and the outer trunk inner cylinder part 25 are separated. In addition, a regular spreader 36 mounted on the rear shield jack 13 is attached to the tip of the piston rod of the front shield jack 11.

In the tenth step, as shown in FIG. 19, on the main line shield excavation side, the front shield excavator 1A of the main line shield excavator 1 (including the front fuselage 2, its accompanying equipment, and the front trunk tail 23). Is temporarily started, excavation is performed while propelling with the front shield jack 11 while assembling the regular segment S with the segment assembling apparatus 7, and the outer shell 22 is separated and left at the stop position. Thereafter, the rear equipment for the main line shield is communicated into the main line tunnel T, and other preparation work before the main line shield excavation is completed. still,
The rear equipment also includes a screw conveyor 10c (see FIG. 21) that is a part of the earth removal device 10. The front shield machine 1A in the main line shield main excavation state is shown in FIG.
0, shown in FIG.

The operation and effect of the above-described main line shield machine 1 will be described. Since the plurality of shield jacks 13 are arranged inside the inner trunk 21 of the middle trunk 3, the length of the main line shield excavator 1 is shortened, and only the front part of the middle trunk 3 is formed by the inner trunk 21 and the outer trunk inner cylinder 25. The structure of the middle body 3 is simplified because the body has a triple structure with the front body tail portion 23 and the rear part of the middle body 3 has a double structure of the inner body 21 and the outer body 24. In addition, since the branch shield machine 40 is carried in after arriving at the branch point, a large space in the inner trunk 3 can be secured, so that the earth discharging device 10 such as an earth discharging conveyor for directly discharging the excavated earth and sand can be provided, and the main line can be provided. In both the tunnel T and the branch tunnel Tb, not only the muddy shield excavation but also the earth pressure type shield excavation becomes possible.

In addition, since the length of the main line shield excavator 1 is shortened, the vertical shaft for loading and assembling the main line shield excavator 1 can be downsized, the curving excavation performance is improved, and the amount of excavation during curving excavation is reduced. The cost of tunneling is reduced.
Since a plurality of thrust transmitting members 12 for transmitting the thrusts of the plurality of shield jacks 13 to the front trunk 2 are provided inside the inner trunk 21, there is no need to transmit the thrust via the inner trunk 21 and the outer trunk 22. The shield jack 13 can be arranged inside the inner trunk 21 of the trunk 3.

The short cylindrical entrance case 38 forming the entrance passage 38a communicating with the branch window hole 37 of the inner body 21 is fixed to the inner surface of the inner body 21. It is not necessary to carry it in, and the work period for branching can be shortened. The thrust transmitting members 12 and the shield jacks 13 of each set are arranged in series in front and rear, and a part of the plurality of sets of the thrust transmitting members 12 and the shield jack 13 are arranged so as to pass through the entrance case 38. The thrust transmitting member 12 and the shield jack 13 can be arranged at appropriate intervals over the entire inner circumference of the inner trunk 21. Further, each set of thrust transmitting members 12
The shield jack 13 and the shield jack 13 are arranged in series in front and rear, so that the structure of the thrust transmission system is simplified.

The branch shield machine 40 includes the branch window 3
When the vehicle 7 reaches the branch position, it is carried into the inner trunk 21, so that a large work space in the main line shield machine 1 can be secured to improve workability, and the earth discharging conveyor and the like can discharge the earth. It is also advantageous in providing the device 10. on the other hand,
The branch shield machine 40 includes a plurality of first, second, and third divided bodies 40A, 40B, and 40C.
A, 40B, and 40C are sequentially carried into the inner body 21 while being excavated in the branching direction, and are assembled. Therefore, the branch shield excavator 1 can be reliably carried in, and the branch tunnel with respect to the diameter of the main tunnel T. It is possible to cope with a case where the ratio of the diameters of Tb is large.

Since the excavating device 10 discharges excavated earth and sand without muddy water, earth pressure shield excavation becomes possible. However, since the earth removal device that excavates and excavates excavated soil is more compact, it is possible to replace the earth removal device with an excavation device that excavates and excavates excavated earth and sand. Excavation is possible and excellent in versatility. In addition, since the erector frame 7b is provided in the front body 2 in advance, there is no need to relocate the rear erector frame 7a, and the amount of work involved in branching can be reduced.
The relatively expensive erector body 7c is connected to the erector frame 7b.
It is advantageous in terms of equipment cost because it is relocated and used.
Further, since the front shield jacks 11 are provided in advance, the rear shield jacks 13 do not need to be relocated, and the amount of work involved in branching can be reduced.

The main line shield machine 1 may be partially modified as follows. 1) In the main line shield excavator 1, a middle bent portion and a pair of middle bent jacks may be provided between the front trunk 2 and the front trunk tail portion 23. Further, a middle bent portion and a pair of middle bent portion jacks may be provided between the middle trunk 3 and the rear trunk 4. 2] The second connection mechanism 33 may be configured as a mechanism for connecting via a plurality of bolts and nuts. 3] It is also possible to further reduce the size of the first divided body 40A of the branch shield excavator 40, and to install the reduced first divided body 40A in the entrance case 38 in the inner trunk 21 in advance. . In this case, the cutter driving mechanism 4
6 may be retrofitted.

4) The branch shield excavator 40 may be divided into two parts instead of three and carried into the inner trunk 21. It is also possible to omit the bent part 55 in the branch shield machine 40. On the other hand, it is not necessary to match the axis of the branch tunnel Tb with the axis of the main tunnel T,
The branch window hole 37 and the entrance case 38 may be configured so that the bottom of the branch tunnel Tb is at the same level as the bottom of the main line tunnel T for branch excavation. In addition, it goes without saying that the present invention can be embodied in a form in which various changes are not allowed without departing from the spirit of the present invention.

[0046]

According to the first aspect of the present invention, since a plurality of shield jacks are disposed inside the inner trunk of the middle trunk, the length of the shield machine is shortened, and only the front part of the middle trunk is connected to the inner trunk. The outer trunk inner cylinder part and the front trunk tail part have a triple structure, and the rear part of the middle trunk has a double structure of the inner trunk and the outer trunk main body, so that the structure of the middle trunk is simplified. In addition, a large space in the middle fuselage can be secured by loading the branch shield machine after arriving at the branch point or by installing only the tip of the branch shield machine in advance, so that the earth is discharged from the earth removal conveyor. It becomes possible to equip the equipment, and it is possible to excavate not only the muddy shield but also the earth pressure shield in both the main tunnel and the branch tunnel. Moreover, since the length of the shield machine becomes shorter,
The vertical shaft for loading and assembling the shield machine can be downsized, and the curving excavation performance can be improved.
The cost of tunnel excavation is reduced.

According to the second aspect of the present invention, since a plurality of thrust transmitting members for transmitting the thrusts of the plurality of shield jacks to the front body are provided inside the inner body, the thrust is transmitted through the inner body and the outer body. Therefore, a shield jack can be provided inside the inner trunk of the middle trunk. In addition, Claim 1
It has the same effect as.

According to the third aspect of the present invention, the short cylindrical entrance case forming the entrance passage communicating with the branch window of the inner body is fixed to the inner surface of the inner body. There is no need to bring it into the main tunnel. The work period for branching can be shortened. Other claim 2
It has the same effect as.

According to the fourth aspect of the present invention, the thrust transmitting members and the shield jacks of each set are arranged in series in front and rear, and some of the thrust transmitting members and the shield jacks pass through the entrance case. Since it is arranged in the state, the thrust transmitting member and the shield jack can be arranged at appropriate intervals over the entire inner circumference of the inner trunk. Further, since the thrust transmitting members and the shield jacks of each set are arranged in series in front and rear, the structure of the thrust transmitting system is simplified. Others
The same effect as the third aspect is achieved.

According to the fifth aspect of the present invention, the branch shield excavator is carried into the inner trunk when the branch window reaches the branch position, so that a large work space in the shield excavator is secured. Thus, the workability can be improved, and this is also advantageous in providing a discharging device such as a discharging conveyor. The other effects are the same as those of the third aspect.

According to the sixth aspect of the present invention, the branch shield machine comprises a plurality of divided bodies, and the plurality of divided bodies are sequentially carried into the inner body while being excavated in the branching direction and are assembled. The shield excavator can be carried in reliably, and it is possible to cope with a case where the ratio of the diameter of the branch tunnel to the diameter of the main tunnel is large. The other effects are the same as those of the third aspect.

According to the seventh aspect of the present invention, since the excavating device for discharging excavated earth and sand without muddy water is provided, earth pressure shield excavation becomes possible. However, since the earth removal device that excavates and excavates excavated soil is more compact, it is possible to replace the earth removal device with an excavation device that excavates and excavates excavated earth and sand. Excavation is possible and excellent in versatility. The other effects are the same as those of the third aspect.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view of a main line shield machine according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a main line shield machine.

FIG. 3 is a sectional view of a main part of a middle trunk of the main line shield excavator.

FIG. 4 is a cross-sectional view of a main part of the inner trunk, showing a state in which a branch window hole of the inner trunk is opened.

FIG. 5 is a cross-sectional view of a main part of the middle trunk in a state where the connection between the front trunk tail and the outer trunk is released and excavation is performed.

FIG. 6 is a cross-sectional plan view of the main line shield machine in the first step.

FIG. 7 is a cross-sectional plan view of the main line shield machine in the second step.

FIG. 8 is a view corresponding to FIG. 2 in a second step.

FIG. 9 is a cross-sectional plan view of a main line shield machine and the like in a third step.

FIG. 10 is a longitudinal sectional view of a main part of a first divided body and the like in a third step.

FIG. 11 is a diagram corresponding to FIG. 10 according to a modification.

FIG. 12 is a cross-sectional plan view of a main line shield machine and the like in a fourth step.

FIG. 13 is a longitudinal sectional view of a main part of a first divided body and the like in a fourth step.

FIG. 14 is a longitudinal sectional view of a main part of a first divided body and the like in a fifth step.

FIG. 15 is a vertical sectional view of a main part of first and second divided bodies and the like in a sixth step.

FIG. 16 is a vertical sectional view of a main part of a branch shield machine and the like in a seventh step.

FIG. 17 is a longitudinal sectional view of a main part of a branch shield machine and the like in an eighth step.

FIG. 18 is a cross-sectional plan view of a front shield machine and the like in a ninth step.

FIG. 19 is a cross-sectional plan view of a front shield machine or the like in a tenth step.

FIG. 20 is a longitudinal sectional view of a branch shield machine.

FIG. 21 is a longitudinal side view of the front shield machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main line shield machine 2 Front trunk 3 Middle trunk 4 Rear trunk 5 Cutter disk 6 Cutter drive mechanism 7 Segment assembling mechanism 10 Discharge device 12 Thrust transmission pipe 13 Shield jack 21 Inner trunk 22 Outer trunk 23 Front trunk tail part 24 Outer trunk Main body 25 Outer trunk inner cylinder part 32 First connection mechanism 33 Second connection mechanism 37 Branch window hole 38 Entrance case 40 Branch shield excavator 40A First divided body 40B Second divided body 40C Third divided body

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-317087 (JP, A) JP-A-8-166584 (JP, A) JP-A 8-326475 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) E21D 9/06 301

Claims (7)

(57) [Claims] A front body, a middle body connected to the front body,
A rear body connected to the rear end of the middle body, a cutter disk and cutter driving means provided on the front body, and a segment assembling mechanism provided inside the rear body are provided. In a shield excavator capable of branching and excavating, the branch shield excavator is configured to be capable of branching and starting from a formed branch window, wherein the inner trunk is an inner trunk, and the outer trunk is slidably mounted on the inner trunk in a double cylindrical shape. An outer trunk fitted with a front trunk tail connected to a rear end of the front trunk, the outer trunk forming a rear part and having an outer trunk main body having the same outer diameter as the front trunk tail; An outer barrel inner cylinder portion extending forward from the front end of the outer trunk body and slidably fitted in a double cylindrical shape inside the front trunk tail portion, and the front end of the inner trunk is a front trunk tail portion. The first connecting mechanism that is detachably connected to the front body and the front end of the outer body inner cylinder part are separably connected to the front body tail part. The second coupling mechanism is provided, the branch excavation can shield machine, characterized in that provided removably a plurality of shield jacks inside of the inner cylinder. 2. The shield excavator according to claim 1, wherein a plurality of thrust transmitting members for transmitting the thrusts of the plurality of shield jacks to the front body are provided inside the inner body. . 3. The branch excavator according to claim 2, wherein a short cylindrical entrance case forming an entrance passage communicating with the branch window of the inner body is fixed to the inner surface of the inner body. Shield machine. 4. A thrust transmitting member and a shield jack of each set are arranged in series in front and rear, and a plurality of sets of thrust transmitting members and a shield jack are arranged so as to penetrate an entrance case. The shield machine capable of branching and excavating according to claim 3, characterized in that: 5. The shield excavator according to claim 3, wherein the branch shield excavator is carried into the inner body when the branch window reaches the branch position. Machine. 6. The branch shield machine according to claim 3, wherein the branch shield excavator comprises a plurality of divided bodies, and the plurality of divided bodies are sequentially loaded into the inner trunk while being excavated in the branching direction and assembled. A shield machine capable of branch excavation as described. 7. The shield machine capable of branch excavation according to claim 3, further comprising an earth discharging device for discharging the excavated earth and sand without muddy water.