JP2003278482A - Cylindrical body and method for start of branched shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and rapidly assemble a branched shield machine by reducing the number of split parts of the branched shield machine for excavating a branched tunnel. <P>SOLUTION: A cylindrical body 4 for the start of the branched shield machine 21 is used at the start of the shield machine 21 (e.g. a first front barrel part 21) which excavates the branched tunnel from inside an existing tunnel 1. The cylindrical body 4 is mounted on an inner wall surface of the existing tunnel 1 which serves as an entrance of the branched tunnel, so as to allow the shield machine 21 to be started from insider. A leading cylindrical material 4a is fixed to the inner wall surface of the existing tunnel 1, and a rear-end cylindrical material 4b is removably coupled to the cylindrical body 4a, and located in the rear of an excavating part 212 at the tip of the shield machine 21 when the excavating part 212 is arranged in a hollow part of the cylindrical material 4a. The cylindrical materials 4a and 4b are provided with tube seals 6 which allow cut-off between inner peripheral surfaces of the cylindrical materials 4a and 4b and the shield machine 21. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting cylinder of a branch shield machine for branching and starting from an existing tunnel to construct a branch tunnel from the existing tunnel, and a method for starting the branch shield machine.

[0002]

2. Description of the Related Art Tunnels (shield tunnels) constructed by the shield method are used in sewers, wiring mines for power and communication, subways, and the like. When constructing this shield tunnel, in order to construct a tunnel (branch tunnel) that branches from the middle of the main line shield tunnel, conventionally, a part of the segment forming the outer peripheral wall of the main line tunnel is cut and removed from the main line tunnel, A closed-type propulsion machine such as a semi-shielding machine for excavating a branch tunnel (hereinafter referred to as a branch shield machine) is carried into the main line tunnel, and the excavation is carried out from the cut and removed portion.

For example, as disclosed in Japanese Patent No. 2880706, a portion of a shield tunnel of a main line to which a branch tunnel is connected is prepared for the start of a branch shield machine for excavating the branch tunnel, and the branch shield machine is passed through. It is constructed with a segment steel part that has an opening that enables the opening, a segment concrete part that closes the opening part, and steel bars that have both ends fixed to the segment steel part and are reinforced inside the segment concrete part. . Then, at the time of construction of the branch tunnel, one opening edge of the tubular entrance case (starting cylinder of the branch shield machine) into which the branch shield machine is inserted is attached to the inner peripheral surface of the segment steel part around the opening. After joining, the steel rod is pulled out, a branch shield machine equipped with an excavation part such as a cutter at the tip is advanced from inside the entrance case, the segment concrete part is cut and removed, and a branch tunnel is excavated.

On the inner peripheral surface of the entrance case, a water stop material for stopping water between the entrance case and the branch shield machine is attached.
Since the branch shield machine excavates the ground by turning the cutter portion at the tip, the branch shield machine is mounted at a position away from the tip portion of the branch shield machine to be inserted, that is, at the opening edge side behind the entrance case.

[0005]

By the way, it is necessary to prepare a branch shield machine having a total length corresponding to the diameter of the branch tunnel branched from the main shield tunnel. Therefore, when excavating a branch tunnel,
The branch shield machine according to the diameter of the branch tunnel is divided into a plurality of parts and conveyed into the shield tunnel, and the branched shield machines are completed by sequentially assembling in the tunnel pit while excavating the divided branch machines.

However, in the structure of the entrance (starting cylinder) of the conventional branch shield machine, when the divided branch shield machine is installed, the water blocking material is provided at a position separated from the tip of the branch shield machine. Since it is necessary, the connection work of the branch shield machine can be performed only in the space inside the existing tunnel mine behind the position of the water blocking material of the entrance case. Therefore, the number of divisions of the branch shield machine increases, and as a result, the assembly work of the branch shield machine is troublesome and the start time of the branch shield machine is long.

An object of the present invention is to reduce the number of divisions of a branch shield machine for excavating a branch tunnel so that the branch shield machine can be assembled easily and quickly, and a starting cylinder and a branch shield of the branch shield machine. It is to provide a method of starting the aircraft.

[0008]

In order to solve the above problems, the invention described in claim 1 is, for example, as shown in FIG.
It is used when the branch shield machine (for example, the first front body part 21) for excavating a branch tunnel from the inside of an existing tunnel (for example, the shield tunnel 1) by the excavation unit (for example, the cutter head 212) provided at the tip is used to start the branch. The inner wall surface of the existing tunnel that becomes the entrance of the tunnel (for example,
A starting cylinder 4 of a branch shield machine, which is attached to a part 11) and is capable of starting the branch shield machine from the inside,
A cylindrical member having a hollow portion through which the branch shield machine can pass (for example, front entrance 4a, rear entrance 4b)
Are connected so as to be coaxial, and these two tubular members can be removed to the leading tubular member 4a fixed to the inner wall surface of the existing tunnel and the leading tubular member. While being connected, when the excavation part at the tip of the branch shield machine is arranged in the hollow part of the leading tubular material, it is the rear tubular material 4b located behind the excavation part, and By projecting inward from the inner peripheral surface of the tubular member, it is possible to stop the water between the inner peripheral surface and the branch shield machine by contacting the outer peripheral surface of the branch shield machine passing through the inside. A water blocking material (for example, a tube seal 6) is provided.

The rear tubular member may be divided into a plurality of tubular members arranged in the axial direction. In this case, a water blocking material is attached to one of the divided tubular members. Alternatively, a water blocking material may be attached to each of the plurality of divided tubular members. When the rear tubular member is divided into a plurality of tubular members, each tubular member may be detachably connected so as to be coaxial.

According to the first aspect of the present invention, the leading tubular member fixed to the inner wall surface of the existing tunnel serving as the entrance of the branch tunnel and the leading tubular member can be removed coaxially with the leading tubular member. And a rear tubular member positioned behind the excavating portion when the excavating portion of the tip of the branch shield machine is arranged in the hollow portion of the leading tubular member. Since each of them is provided with a water blocking material, a branch shield machine is placed across each hollow part, and the leading tubular material is attached to the inner wall surface of the existing tunnel, and the trailing tubular material is installed. By digging the branch shield machine while stopping water between the branch shield machine and the tubular material of the tail with a water blocking material, the excavation part provided at the tip of the branch shield machine is the top tubular shape. Move it to a position in front of the waterproof material, and remove the tubular material at the tail. Together when removed by, the water stopping material of the head portion, it is possible to further excavation of the branch shield machine while the water stopping between the tubular member of the said branch shield machine head. That is, since the tubular material at the tail can be removed and the branch shield machine can be further propelled, a wide space can be formed in the rear of the branch shield machine due to the absence of the tubular material at the tail. it can. Therefore, for example, the above-mentioned branch shield machine is a tip part in which the branch shield machine complete body for excavating a branch tunnel is divided into a plurality of branch machines, and is provided with an excavating portion for excavating a branch tunnel in the front part. In some cases, connection work will be done behind this branch shield machine, but since this rear space is large, it is possible to reduce the number of divisions of the complete branch shield machine and also between the divided branch machines. Connection work can be performed easily and quickly.

According to a second aspect of the present invention, for example, as shown in FIGS. 1 and 3 to 6, a branch tunnel for branching from an existing tunnel using the starting cylinder of the branch shield machine according to the first aspect. A method of starting a branch shield machine having a digging portion at a tip end for digging a tunnel, the method comprising: starting a branch shield machine on an inner wall surface (for example, site 11) of an existing tunnel in which an entrance of the branch tunnel is formed. The leading tubular member (for example, the front entrance 4a) of the starting tubular body 4 in which the branch shield machine (for example, the first front trunk portion 21) is arranged so as to face the peripheral surface is fixed, and then the above While stopping water between the inner peripheral surface of the tubular material (for example, the tube seal 6) of the tubular material at the tail of the starting tubular body (for example, the rear entrance 4b) and the branch shield machine, Dig the branch shield machine By moving the excavation part of the shield machine forward of the leading tubular material, then removing the trailing tubular material and stopping the water by the water blocking material of the leading tubular material. It is characterized in that the branch shield machine is further advanced while the water is stopped between the inner peripheral surface of the branch shield machine and the branch shield machine.

According to the second aspect of the present invention, when the branch shield machine is started from inside the existing tunnel, the inner peripheral surface of the tubular member is stopped by the water blocking material of the tubular member at the tail of the starting tubular body. The branch shield machine is moved forward while stopping the water between the branch shield machine and the branch shield machine to move the excavated part of the shield machine forward of the leading tubular material, and then remove the trailing tubular material. In addition, the branch shield machine can be further excavated while stopping the water between the inner peripheral surface of the tubular material and the branch shield machine by the water stop material of the leading tubular material. The shield machine and the existing tunnel will stop the water at a position closest to the entrance of the branch tunnel inside the existing tunnel. Therefore, the space inside the existing tunnel behind the branch shield machine excavated from the existing tunnel becomes large, and the connection work of the branch shield machine can be performed in this space. That is, since the space for performing the connecting work is wider than the conventional space, the number of divisions of the branch shield machine can be reduced, and the connecting work can be performed easily and quickly.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. The starting cylinder of the branch shield machine in this embodiment is attached to a part of the existing tunnel that is the entrance of the branch tunnel in preparation for the start of the branch shield machine for excavating a tunnel (branch tunnel) branching from the existing tunnel. The branch shield machine is launched from inside. The branch shield machine according to the present embodiment is divided into a plurality of pieces and is assembled while excavating in a tunnel pit. Figure 1
Then, in the existing tunnel 1 pit, a cylindrical starting cylinder 4 through which the branch shield machine passes, and a starting cylinder 4 in which the branch shield machine passes, at a portion 11 which is an entrance of the branch tunnel in the peripheral wall of the tunnel. The 1st trunk | drum 21 which comprises the front-end | tip part of the fitted branch shield machine 2 is arrange | positioned.

The existing tunnel 1 is a shield tunnel constructed by excavating the ground with a shield machine and assembling steel segments, and the portion of the outer peripheral wall which is the entrance of the branch tunnel in this main line shield tunnel. 11 is composed of segments made of unreinforced concrete. In detail, the peripheral wall portion including the entrance of the branch tunnel is assembled by a plurality of steel segments, and the assembled peripheral wall has an opening serving as the entrance. Is closed by unreinforced concrete. In addition, unreinforced concrete has a structure that can withstand earth pressure from the outside until the branch shield machine is dug to construct a branch tunnel. For example,
A structure in which a removable steel material is arranged inside and both ends of the steel material are fixed to steel segment portions around the unreinforced concrete portion can be mentioned. In addition, on the inner peripheral surface of the existing tunnel 1, a mounting portion 12 is connected around the opening serving as the entrance of the branching tunnel in a state where one (leading) opening edge of the starting cylinder is in close contact. It is provided.

A branch shield machine 2 for excavating a branch tunnel branching from an existing tunnel has a cylindrical shape and is shown in FIG.
As shown in FIG. 2, a cutter head (excavation part) 212 has a first front body part (branch shield machine) 21 attached to the front surface, and a second cylindrical steel frame connected to the first front body part 21 And the first rear body portion 2 which is connected to the third front body portions 22 and 23 and the third front body portion 23 and has the center folding jack 251.
5, the second rear body portion 26 connected to the first rear body portion 25, the second
It is divided into six parts from the third rear body part 27 and the like connected to the rear body part 26, and is sequentially assembled in the tunnel mine (assembly space S) behind the base end part of the branch tunnel to be excavated. Branch shield machine 2 in this embodiment
Is for excavating the tunnel by the earth pressure type shield method, but it may be a branch shield machine for excavating the tunnel by the mud type shield method. In addition, the branch tunnel is constructed by assembling the segments (for example, the temporary segment G in FIG. 7) along the inner circumference of the excavated branch tunnel in the rear trunk formed by connecting the first to third rear trunks. ..

The first front body portion 21 shown in FIG. 1 is a cylindrical body installed with its front direction facing the portion 11 where the entrance is formed, and has a cylindrical main body portion 20 and the main body portion. A disk-shaped cutter head 212 (excavation part) having a roller cutter 211 for crushing hard rock or the like is provided on the front surface of the part 20 while rotating around an axis. A partition wall 20a is provided in the main body, and the partition wall 2a
0a and the cutter head 212 are between the cutter head 2
Chamber 2 for retaining sediment excavated by 12
A chamber gate 215 is provided on the partition wall 20a so as to be openable and closable. This chamber gate 21
5 is a screw conveyor (indicated by reference numeral 216 in FIG. 7)
A rotary pump 217 for carrying out the excavated earth and sand is attached until it is attached, and the rotary pump 217 is closed when the screw conveyor is attached to prevent the excavated earth and sand from being ejected. Further, the back surface side of the partition wall 20a, that is, the main body portion 20.
A cutter head drive device 213, which drives the cutter head 212 by a plurality of motors, is provided therein.

The starting cylinder (entrance) 4 of the branch shield machine is for preventing the inflow of earth and sand into the mine when the propulsion machine of each branch machine constituting the branch shield machine 2 is started. The machine is passable, that is, it has a tubular shape that allows each of the divided machines obtained by dividing the branch shield machine to pass. The starting cylinder 4 is formed by connecting a plurality of (in this case, two) cylindrical members 4a and 4b each having a hollow portion through which each of the dividing machines can pass, so as to be coaxial with each other. . Hereinafter, the tubular material on the side of excavating the branch tunnel, that is, the excavation direction side is referred to as the front entrance 4a, and the one behind is referred to as the rear entrance. Then, in the inner peripheral portions of the front and rear entrances 4a, 4b, by projecting inward from the inner peripheral surface of each entrance, a part of the branch shield machine 2 that passes through the hollow portion of each entrance (in FIG. 1 a front body portion 21) is in contact with an outer peripheral surface of the entrance and an inner peripheral surface of the entrance and a part of the branch shield machine 2 (the first front body portion 21 in FIG. 1) can be stopped. ) 6 is provided.

The tube seal 6 is, as shown in FIG.
A cylindrical entrance body 40 that constitutes each entrance
It is provided in an annular groove 41 formed in the inner circumference of the entrance body 40 over the entire inner circumference of the entrance. The tube seal 6 has a predetermined width in the annular groove 41, one end portion 61 a is fixed, and the other end portion 61 b is an annular water-tight seal 61 capable of projecting inward, and the water-tight seal 61. A back surface, in other words, a bottom surface side of the annular groove 41, is provided adjacent to the water blocking seal 61 side, that is, a tubular auxiliary member 62 that elastically deforms so as to bulge toward the axial direction of the entrance.

The waterproof seal 61 is arranged in the annular groove 41 such that the surface 61c thereof is substantially flush with the inner peripheral surface 40a of the entrance, and the one end portion 61a, that is, the rear end portion 61a of the entrance is provided. It is attached to the main body 40 by a mounting bracket 42. In addition, the width of the water blocking seal 61 is such that the other end portion 61b protruding inward from the inner peripheral surface of the entrance when the branch shield machine passes through each entrance or when the branch shield machine is arranged inside. Is the length of sliding contact with the outer peripheral surface of the branch shield machine. Further, the end portion 62 a of the auxiliary member 62 on the inner side of the tunnel mine, together with one end portion of the water stop seal 61, is attached to the fitting 4
2 attached and the front end 6 of the entrance
2b is fixed by the second mounting member 43. When the auxiliary member 62 is elastically deformed, when it bulges inward, the auxiliary member 62 is attached to the outer peripheral surface 2a of the branch shield machine passing through each entrance or the outer peripheral surface 2a of the branch shield machine disposed inside. Can be closely attached.

Further, the outer peripheral surface 4 of the entrance body 40 is attached to the bottom surface of the annular groove 41 of the entrance body 40.
A through hole 45 communicating from 0b into the annular groove 41 is formed, and a fluid pressure such as air pressure or hydraulic pressure is applied to the annular groove 41 through the through hole 45 to move the auxiliary member 62 inward. Inflate. That is, when the fluid pressure such as air pressure or hydraulic pressure is sent to the back surface side of the auxiliary member 62 through the through hole 45, the auxiliary member 62 elastically deforms and bulges toward the water stop seal 61 side. The other end of the water seal 61 is pushed inward toward the entrance 4a (4b), and the auxiliary member 62 itself also bulges inward together with the water stop seal 61. In other words, the water blocking seal 61 opens in a skirt shape in which the diameter gradually decreases from the other end portion 61b toward the one end portion 61a, and the other end portion is pressed against the outer peripheral surface of the passing branch shield machine to be in sliding contact therewith. At the same time, the auxiliary member 62 itself slides in contact with the outer peripheral surface of the branch shield machine together with the water blocking seal 61. As a result, water is stopped between the inner peripheral surface of the entrance and each of the assembled branch machines (first to third front trunk sections and first to third rear trunk sections) that constitute the branch shield machine 2 (Fig. 2 in phantom).

The other end of the water blocking seal may be pushed inward by using a hydraulic cylinder or the like. In this case, after the other end is pushed inward from the hydraulic cylinder, auxiliary operation is performed. By bulging the member, the water is stopped between the tubular body and the branch shield machine.

Next, with reference to FIGS. 1 and 3 to 6, a method of starting a branch shield machine using the starting cylinder 4 of the branch shield machine of the present embodiment will be described. First, as shown in FIG. 1, in the existing tunnel 1, the branch shield machine 2 is made to face the location where the branch tunnel is branched, that is, the inner peripheral surface (portion 11) of the existing tunnel 1 which is the entrance of the branch tunnel. The first front body portion 21 is arranged so as to be fitted inside the starting cylinder body 4. Then, the front end of the front entrance 4a of the starting cylinder 4 is joined to the mounting portion 12 while being in close contact with it. Here, they are joined together by welding by being welded. At this time, the axis of the starting cylinder 4 and the branch shield machine 2
The axis of the first front trunk portion 21 is aligned with the axis of the branch tunnel to be excavated.

Next, as shown in FIG. 3, in the tunnel pit, the cutter head 212 equipped with the first front body portion 21 in the starting cylinder 4 at its tip and the rear entrance 4b.
The tube main body 21 of the first front body portion 21 is arranged inside the tube seal 6 of the rear entrance 4b by advancing so as to be located in front of the tube seal 6. Then, the tube seal 6 of the rear entrance 4b is operated (this operating state is shown by a mark X in a rectangular frame in each drawing) so that the space between the starting cylinder 4 and the first front trunk portion 21 is increased. The water is stopped (see FIG. 2), the backward movement preventing device 14 is attached to the rear end of the rear entrance 4 b, and the chamber 214 is filled with mud.

Next, as shown in FIG. 4, the first front body 2
In order to advance the first front body portion 21, the temporary provisional shield jack 16 that takes a reaction force from the segment forming the existing tunnel 1 is attached to the first body portion 1, and the first front body portion 21 is advanced. Then, the first front body portion 21 that has been excavated crushes the inner peripheral wall at the entrance of the branch tunnel, specifically, the portion 11 constructed of unreinforced concrete,
The cutter head (excavation portion) 212 at the tip of the front body portion 21 is located in front of the front entrance 4a. Note that FIG.
Then, the front surface of the cutter head 212 is located in the ground outside the tunnel 1.

Next, as shown in FIG. 5, the tube seal 6 which has been previously water-stopped is removed. Here, the rear entrance 4b provided with the tube seal 6 is disassembled so that the tip end of the attachment portion 12 is removed. The tube seal 6 of the front entrance 4a is operated while being removed from the opening edge of the rear end of the front entrance 4a fixed at the opening edge. At this time,
The retreat prevention device 14 attached to the rear end of the rear entrance 4b is also removed and attached to the rear end of the front entrance 4a to prevent the front entrance 4a from retreating when the first front body portion 21 is dug.

Then, the first front body portion 21 is further dug through the temporary shield jack 16. At this time, the first front body portion 21 and the inside of the tunnel pit are in a state of being stopped by the tube seal 6 of the front entrance 4a attached to the portion that becomes the entrance of the branch tunnel. That is, since the water is stopped by the tube seal 6 arranged in the tunnel mine closest to the branch tunnel side,
The space S behind the first front body portion 21 is provided at the rear entrance 4b.
It is wider than the space formed behind the rear entrance 4b in a state where the water is stopped by the tube seal 6.

Then, the temporary shield jack 16 is re-arranged in the tunnel pit, and the space S behind the first front body portion 21 is changed.
Into the first front body part 21, the second front body part 22 connected to the first front body part 21 is carried in and joined to the first front body part 21, and the second front body part 22 is joined. 21 and the second front body portion 22 are further advanced. Similarly, the third front body portion 23 joined to the second front body portion 22 is carried into the space, joined to the second front body portion 22 and advanced (see FIG. 6). By repeating this work, that is, carrying in the dividing machine, joining, and excavation in order,
The first rear body portion 25, the second rear body portion 26, and the third rear body portion 27 are joined together to assemble the branch shield machine 2. And
As shown in FIG. 7, an erector 17 for moving the segments in the circumferential direction and a shield jack 18 for propelling the branch shield machine 2 are installed in the branch shield machine 2. Assemble the segment G to take the reaction force when the branch shield machine 2 advances by the erector 17.
The branch shield machine 2 is propelled by taking a reaction force from the segment G by the shield jack 18.
Further, a screw conveyor 216 for carrying out the earth and sand excavated from the branch shield machine 2 is attached to complete the branching work.

According to the start method of the branch shield machine using the start cylinder 4 of the branch shield machine described above, when the divided branch shield machine 2 is assembled in the tunnel pit, the branch machine already carried in and the existing branch machine are installed. Since water can be stopped from the tunnel 1 by the tube seal 6 of the front entrance 4a of the starting cylinder 4, the water can be stopped near the inner wall surface on the entrance side of the branch tunnel in the existing tunnel 1. As a result, the space S in the rear of the first front body portion 21 that has already been carried in and each branch machine sequentially connected from the first front body portion 21 can be widened. Therefore, since the divided shield machine can be assembled using this space S, the number of divisions of the branched shield machine 2 can be reduced, and the branched shield machine can be assembled quickly. It can be done easily.

In the above embodiment, the starting cylinder is composed of the two entrances 4a and 4b provided with the tube seals. However, the present invention is not limited to this. It may consist of an entrance. At this time, it is desirable that the tube seals of the rear entrances be used in order to stop the water with the respective tube seals. Also,
An entrance without a tube seal may be provided between the front and rear entrances 4a and 4b.

[0030]

According to the invention described in claim 1, the branch shield machine is arranged in each hollow portion, and the leading tubular member is attached to the inner wall surface of the existing tunnel, and the trailing tubular shape is provided. While cutting water between the branch shield machine and the tubular material at the tail with a water blocking material of the material, by advancing the branch shield machine, the excavation part provided at the tip of the branch shield machine is at the top. The tubular material is moved to a position in front of the water blocking material, and the tubular material at the tail is removed, and the water blocking material at the leading portion causes a gap between the branch shield machine and the leading tubular material. The branch shield machine can be further advanced while the water is stopped. That is, since the tubular material at the tail can be removed and the branch shield machine can be further propelled, a wide space can be formed in the rear of the branch shield machine due to the absence of the tubular material at the tail. it can. Therefore, for example, the branch shield machine constitutes a part of the branch shield machine for excavating the branch tunnel, that is, the tip end portion of the branch shield machine divided into a plurality of branch machines, and the branch tunnel machine is excavated in the front portion. If it is equipped with an excavating section, the connecting work will be done behind this machine, but since this rear space is wide, the number of divisions of the branch shield machine can be reduced and the branch machine Connection work between them can be performed easily and quickly.

According to the second aspect of the present invention, the branch shield machine and the existing tunnel can stop the water at the position closest to the entrance of the branch tunnel inside the existing tunnel, whereby the excavation from the existing tunnel is performed. The space inside the existing tunnel behind the split shield machine is widened, and the connection work of the branch shield machine can be performed in this space. That is, since the space for performing the connecting work is wider than the conventional space, the number of divisions of the branch shield machine can be reduced, and the connecting work can be performed easily and quickly.

[Brief description of drawings]

FIG. 1 is a schematic side cross-sectional view showing a state in which a first front trunk portion of a branch shield machine that is divided together with a starting cylinder of a branch shield machine according to an embodiment of the present invention is carried into an existing tunnel mine. is there.

FIG. 2 is a schematic cross-sectional view showing the structure of the tube seal of FIG.

FIG. 3 is a diagram showing a state in which the branching shield machine according to the embodiment of the present invention is started while assembling the branching shield machine using the starting cylinder.

FIG. 4 is a diagram showing a state in which the branch shield machine of the embodiment to which the present invention is applied is started while assembling the branch shield machine using the starting cylinder.

FIG. 5 is a diagram showing a state in which the branch shield machine according to the embodiment of the present invention is started while assembling the branch shield machine using the starting cylinder.

FIG. 6 is a diagram showing a state in which the branch shield machine of the embodiment to which the present invention is applied is started while assembling the branch shield machine using the starting cylinder.

FIG. 7 is a diagram showing a state in which the branching shield machine of the embodiment to which the present invention is applied is started up while assembling the branching shield machine using the starting cylinder.

[Explanation of symbols]

1 Shield tunnel (existing tunnel) 2-branch shield machine 2a outer peripheral surface 4 Starting cylinder 4a Front entrance (first tubular material) 4b Rear entrance (cylindrical material at the rear) 6 Tube seal (water blocking material) 11 parts 21 1st front trunk (part of branch shield machine) 40a Inner surface of entrance body 212 Cutter head (excavation section) S assembly space

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoichi Takasuka             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Toru Watanabe             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Yoshio Iso             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Masanori Kobayashi             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Noriyuki Arai             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Masaaki Nomoto             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Kenji Mito             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Soga sincerity             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Satoru Yamauchi             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Ikuo Oe             Nishimatsuken 1-20-10 Toranomon, Minato-ku, Tokyo             Inside the corporation (72) Inventor Mitsuo Shimizu             8th Niijima, Harima-cho, Kako-gun, Hyogo Prefecture Kawasaki Heavy Industries             Business F-term (reference) 2D054 AA03 AC01 EA01 EA07 EA09

Claims (2)

[Claims] 1. An inside of the existing tunnel, which is used when starting a branch shield machine for excavating a branch tunnel from within an existing tunnel by an excavation unit provided at a tip, and which is an entrance of the branch tunnel. Is a starting tubular body of a branch shield machine capable of starting the branch shield machine, wherein two tubular materials having hollow portions through which the branch shield machine can pass are connected so as to be coaxial. The two tubular members are a leading tubular member fixed to the inner wall surface of the existing tunnel, and a detachable connection to the leading tubular member, and a hollow portion of the leading tubular member. When the excavation part of the tip of the branch shield machine is arranged in, while being a tubular member of the tail located behind the excavation part,
By projecting inward from the inner peripheral surface of each of the tubular members, it is possible to contact the outer peripheral surface of the branch shield machine passing through the inside to stop water between the inner peripheral surface and the branch shield machine. A start-up cylinder for a branch shield machine, which is provided with a waterproof material. 2. A branch shield machine for starting a branch shield machine having an excavation portion at a tip end thereof for excavating a branch tunnel branching from an existing tunnel using the starting cylinder of the branch shield machine according to claim 1. The starting tubular material of the starting cylinder in which a branch shield machine is arranged inside the inner wall surface of an existing tunnel where the entrance of the branch tunnel is formed so as to face the inner peripheral surface. Then, the branch shield machine is excavated while stopping the water between the inner peripheral surface of the tubular material and the branch shield machine by the water stop material of the tubular material at the tail of the starting cylinder body. By doing so, the excavation part of the shield machine is moved forward from the leading tubular material, and then the trailing tubular material is removed and the water blocking material of the leading tubular material Do not stop the water between the inner peripheral surface and the branch shield machine. The branch shield machine is further advanced, and the branch shield machine is started.