JPH06264684A - Slurry pipe extending device - Google Patents

Abstract

PURPOSE:To extend a slurry pipe for use in a slurry shield construction method without requiring manpower, in a manner permitting continuous adjustment of slurry pressure. CONSTITUTION:Between stator flanges 15, 16 wherein a connection cylinder 35 able to receive a slurry feed pipe 7A is provided on one side and a movable pipe 12 being a discharge part is provided on the other side, there is provided a rotary body 14 having a plurality of sheath pipes 17 each of which can accommodate a single pipe 9 being a slurry pipe, so that by rotating the body 14, a single pipe 9 is connected to the slurry feed pipe 7A. While the interior 17s of a specified sheath pipe 17 is being isolated by a plug 29 and open/close cylinder 32, slurry 20 of the interior 17s of the pipe 17 is once withdrawn by means of a slurry recovery mechanism 28 and a cap plug 31 is removed and a new single pipe 9' is inserted into the interior 17s and thereafter the slurry 20 is returned into the pipe 9'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muddy water pipe extension device suitable for use by connecting to a shield device when excavating and constructing a tunnel by a muddy water shield method.

[0002]

2. Description of the Related Art Conventionally, in the shield construction by the mud shield method, along with the shield excavation, the mud pipe for discharging the mud and for discharging the mud must be sequentially extended without delay in order to hold the face and carry out the excavated soil. . Therefore, in order to perform the work of extending the mud pipe such as the mud pipe and the mud pipe without stopping the mud pipe, for example, as shown in JP-A-63-293298, the tip of the installed pipe is The extension pipe is connected to the extension device, and when the face has advanced by one pipe length, the extension pipe is loaded into the extension device to which the installed pipe is connected, and the extension pipe is added. The device has already been proposed.
In such a pipe extension device, a mud flow region in which the open end of the installed mud pipe is placed inside the pipe extension device and a loading region in which a newly added mud pipe is loaded and accommodated are pressure-controlled. A pipe extension operation is performed in such a manner that a new muddy water pipe is first loaded in the loading region and then the loaded muddy water pipe is moved to the muddy water flow region.

[0003]

However, in such a pipe extension device, the pressure muddy water is filled in the newly added muddy water pipe that has been moved to the muddy water distribution region during the muddy water pipe extension work. During this period, the mud pressure cannot be adjusted at all, but during this time, the cutter bit side of the shield device continues to excavate the face even during the mud pipe extension work, so it suddenly loses due to a change in the face. It is possible that mud or the like will be generated. Then, when the supply and pressurization of the sent and discharged mud water is urgently required in response to such a change in the face, the conventional pipe extension device can handle the new mud pipe by waiting until the pressure mud is filled. It is undeniable that this will result in a slight delay in facilitating the collapse of the face such as lost mud. However, if the charging area in which the mud pipe to be newly added is accommodated is made to communicate with the mud circulation area and the pressure mud is filled therein,
Since a new mud pipe must be sequentially replenished and loaded into the loading area from the outside of the pipe extension device, the mud overflows from here to the level of the replenishment loading of the new mud pipe, and only that much. There is an inconvenience that the muddy water is wasted and that it takes time to process the overflowing muddy water. Therefore, in view of the above circumstances, the present invention, in extending the mud pipe such as the mud pipe for use in the mud shield construction method, the mud pipe, the treatment of the pressure mud at the time of loading the mud pipe is simple,
To provide a mud pipe extension device capable of continuously adjusting the mud pressure to an arbitrary value without waiting for the pressure mud to fill a new mud pipe that is added to the laid mud pipe. To aim.

[0004]

That is, the present invention provides a first rotating body supporting means (16) and a second rotating body supporting means (15).
Are provided at a predetermined interval in the front-rear direction of the tunnel building direction, and the first rotating body supporting means (16) is provided with a muddy water pipe receiving mechanism (35) and the tip (9a) of the existing muddy water pipe (7A).
Is provided so that the muddy water pipe (7A) can be slidably supported along the axis thereof, and the muddy water pipe receiving mechanism (35) of the second rotating body supporting means (15) Connection pipe line mechanisms (15a, 12) that are connectable to the shield machine (2) are provided at opposing positions, and the connection is made between the first rotating body supporting means (16) and the second rotating body supporting means (15). In addition, a rotary body (14) having a plurality of sheath pipes (17) capable of accommodating the mud pipes (9, 9 ') in each of the insides (17s) thereof is rotatably provided and the sheath pipes (17) are provided in the mud pipe. Water pipe receiving mechanism (3
5) and the connection conduit mechanism (15a, 12) are provided in a selectively positionable manner, and the first rotating body supporting means (16) and the second rotating body supporting means (15) are provided with: The sheath pipe (17) is provided with loading means (26, 27) capable of selectively loading the mud pipes (9, 9 '), and the loading means (26, 2)
7) has first and second valve bodies (29) and (32) that can open and close the front end and the rear end of the sheath tube (17), respectively, and the first and / or second valve body (29/32),
A discharge / injection means (28) capable of discharging and injecting muddy water (20) in the inside (17s) of the sheath pipe (17) is provided, and the plug (31) is attached to the first and / or second valve body (29/32). )
A valve body (29/32) provided with the plug (31)
The sheath tube is detachably provided so that the inside of the sheath tube can communicate with the outside via the. The numbers in () are
It is to be understood that the corresponding elements in the drawings are shown for convenience and the present description is not limited to the description of the drawings. The same applies to the following action columns.

[0005]

According to the present invention having the above-described structure, the first and second valve bodies (29) and (32) close the front end and the rear end of the predetermined sheath pipe (17) to thereby form the sheath pipe (17). Inside (1
7s) is isolated from the outside, and in this state, the discharge injection means (28) has the sheath tube (17) isolated from the outside.
It works to drain or inject the muddy water (20) inside (17s).

[0006]

1 is a view showing an example of a tunnel being constructed by a mud shield method, FIG. 2 is a sectional side view showing an embodiment of a mud pipe extension device according to the present invention, and FIG. 3 is a mud pipe shown in FIG. III, III sectional view in the extension device, FIG. 4 is an exploded perspective view of a rotor flange and a stator flange in the muddy water pipe extending device shown in FIG. 2, and FIG. 5 shows a plug closed state in the muddy water pipe extending device shown in FIG. Partly enlarged view, FIG. 6 is FIG.
FIG. 7 is a partially enlarged view showing a plug opening state in the muddy water pipe extending device shown in FIG. 7, FIG. 7 is an enlarged view showing a connection part of a laid muddy water pipe and a new muddy water pipe connected to the muddy water pipe extending device shown in FIG. FIG. 8 is a cross-sectional side view showing a connection state of the installed mud pipe shown in FIG. 7 and a new mud pipe connected to the mud pipe, and FIGS. 9 to 11 are extension methods of the mud pipe in the mud pipe extension device shown in FIG. FIG.

As shown in FIG. 1, the tunnel 1 being constructed by the muddy water shield method is excavated and formed in the soft ground 3 by a shield device 2 which is a shield machine whose cutting blade is formed in a disk shape. 1 has a tunnel 5 which is still under excavation from the arrow B direction side in FIG. 1 toward the arrow A direction side.
“A” is formed as a tumbling columnar shape having a shape capable of advancing in the direction of arrow A as an excavation tip, and is lined and supported by segments or the like. In the invert 5b shown in the lower part of the mineway 5 in FIG. 1, a hydraulic motor for supplying power to the shield device 2, a trailing vehicle (not shown) equipped with backfill injection equipment, substation equipment, etc. In the form of being connected to the device 2, it is movably supported on a suitable temporary rail 6, and the temporary rail 6 can be extended in the direction of arrow A in FIG. 1 as the cutting face 5a advances. It extends in the directions of arrows A and B.

As shown in FIG. 1, a muddy water facility 7 is provided in the mineway 5 in such a manner that its length in the directions of arrows A and B can be extended as the face 5a is dug. ,
A muddy water conduit 70 formed in a muddy water pipe 7A in the form of feeding muddy water 20 in the direction of arrow A in FIG. 1 from the upper part of FIG. 1 is discharged from the lower part of the shield device 2 shown in FIG. 1 by mixing the muddy water 20 sent to the 5a with the excavation slag, and it is pumped in the direction of arrow B in FIG. Two pipes are provided in which the flow direction of the mud water 20 is opposite to the flow direction of the mud discharge pipe (not shown) that is discharged. The mud sending pipe 7A and the drain mud pipe (not shown) in the mud water facility 7 are simply configured such that the flowing directions of the mud water 20 are opposite to each other, and the two are configured in substantially the same manner. Mud pipe 7A
And the mud pipe 70 formed by the mud pipe and the pipe extension device 10 as a mud pipe extension device for extending the mud pipe, and a detailed description of the mud pipe and the mud pipe formed by the mud pipe. Illustration is omitted. The construction of the mud pipe extension device for extending the mud pipe and the installation direction in the gallery 5 are substantially the same as those of the pipe extension device 10 described below, and the flow direction of the mud water 20 is the only opposite direction. It has become.

That is, in the muddy water facility 7, as shown in FIG.
A mud pipe extension device 10 which is a mud pipe extension device for extending the mud pipe 7A forming the mud pipe line 70 is already installed therein, that is, an existing mud pipe. 7
The top portion of A is accommodated, and the muddy water 20 can be pressure-fed and fed to the cutting blade side of the shield device 2, that is, the cutting face 5a side through the pipe extension device 10 and the flexible pipe 11 connected thereto. The pipe extension device 1 is movably provided in the tunnel 5 in the directions of arrows A and B, which are the axial directions of the tunnel.
On the right side of FIG. 1, which is the rear side shown in the arrow B direction of 0, mud pipes 7A are already installed in such a manner that the pipe extension device 10 and the wellhead 5c side are connected. The mud transport pipe 7A is configured by connecting a single pipe 9 made of a steel pipe or the like as one mud pipe and connecting a plurality of the single pipes 9 in series in the directions A and B shown in FIG. In the embodiment, each single pipe 9 which is a muddy water pipe has a predetermined pipe outer diameter D1 shown in FIG. 2 and has a predetermined length L1 (shown in FIG. 1 in the directions of arrows A and B). For example, in the embodiment, L1 = 5.0 to 6.0 m) is formed. The plurality of single pipes 9 constituting the mud transport pipe 7A are already installed by being temporarily fixed to the invert 5b or the like so that they cannot move. As shown in FIG. 2, the opening end 9a, which is the tip of the mud sending pipe 7A, is extended to the single pipe 9 at the leading position by the extension single pipe 9'through the opening end 9a. The mud pipe 7A is opened in the pipe extension device 10 so that it can be extended in the directions of arrows A and B. (It should be noted that the single pipe 9 constituting the mud transport pipe 7A and the single pipe 9'for extension newly added to this are exactly the same members, but in the embodiment, for convenience of explanation, these Different symbols are attached to the single pipes 9 and 9'to distinguish them.) On the other hand, a flexible resin pipe is provided on the front side of the pipe extension device 10 shown in the arrow A direction in FIG. A flexible pipe 11 made up of, for example, a movable pipe 1 which is a discharge port of the device 10 in a form of connecting the pipe extension device 10 and the shield device 2.
2 is attached to the discharge port 12a shown on the arrow A direction side.

As shown in FIG. 1, the pipe extension device 10 has a pedestal-shaped frame 13 rotatably supported on the temporary rail 6 via wheels 131 and the like. Stator flanges 16 and 15 which are first and second rotating body supporting means, each of which is formed into a generally disk-like overall shape, are disposed on the predetermined direction 13 in the directions A and B, which are the tunnel building direction and the front-back direction. It is provided in the form of intervals. Stator flange 16 which is a first rotating body supporting means
As shown in the lower right part of FIG. 2, a connection cylinder 35, the details of which will be described later, as a muddy water pipe receiving mechanism that can receive the opening end 9a that is the tip of the existing muddy water pipe 7A.
However, a shape that is movable in the directions of arrows A and B by a predetermined stroke L2 with the mud pipe 7A inserted therethrough.
That is, the sludge pipe 7A is provided so as to be slidably supported along its axis, while the stator flange 15 as the second rotating body supporting means is shown in the lower left portion of FIG. As described above, the joint cylinder 15a is provided at a position facing the connection cylinder 35 provided on the stator flange 16 side.
The movable pipe 12 is provided as a connection conduit mechanism connectable to the shield device 2 in such a manner that it is slidably fitted in the directions A and B.

In addition, between the stator flanges 16 and 15, the rotating body 14 is rotated in the directions of arrows M and N in FIG. 1 about an axis parallel to the tunnel axis (that is, the axis CT0 of the main shaft 21 described later) as the center of rotation. It is rotatably installed and rotates 14
As shown in FIG. 3, each of the single pipes 9, that is, the laid mud pipe 7A, is oriented in the direction of the arrows A and B which are the axial directions of the tunnels. It has a plurality of, for example, four sheath tubes 17 capable of accommodating a new single tube 9'for addition which is to be added to. The rotator 14 has four sheath tube standby positions ST1, ST2,
As shown in FIG. 3, ST3 and ST4 are set in such a manner that their respective axial centers are arranged on the same circumference, and the four sheath pipes 17 are rotated by the rotating body 14 so that each sheath pipe Standby position S
Each of T1, ST2, ST3, and ST4 can be moved and positioned. Standby position ST for four sheaths
1, ST2, ST3, ST4 in FIG. 2 lower side or FIG.
As shown in FIG. 2, the sheath pipe standby position ST1 shown in the lowermost portion includes the muddy water pipe receiving mechanism formed by the connection cylinder 35, the movable pipe 12, and the joint cylinder 15.
It is arranged to be arranged between the connection conduit mechanisms formed by a. Therefore, each sheath pipe 17 of the rotating body 14 is selectively positioned between the muddy water pipe receiving mechanism and the connection conduit mechanism. It can be done.

As shown in FIG. 2, each sheath pipe 17 of the rotating body 14 is slightly smaller than the length L1 of the single pipe 9 which is one mud pipe forming the mud pipe 7A. The sheath tube 17 has a length and an inner diameter slightly larger than the outer diameter D1 of the single tube 9. Each sheath tube 17 is formed so as to project at both ends in the directions of arrows A and B. Flange 17a,
Each of the front and rear surfaces of 17a is fixedly mounted on a pair of rotor flanges 18 and 19 which are each formed in a generally disk shape as a whole and are arranged at predetermined intervals in the directions of arrows A and B. There is. The rotor flanges 18 and 19 are provided with holes 18s and 19s for attaching the sheath pipes, respectively, by the number of the sheath pipes 17 provided on the rotating body 14, that is, four in the embodiment, respectively, in the directions of arrows A and B. The rotor flanges 18 and 19 are formed so as to penetrate therethrough.
s and the inside 17s of each sheath pipe 17 are communicated with each other, and four sheath pipes 17 are supported. In this state, the stator flange 1
5 and 16 are rotatably fitted. Also, the rotating body 1
4, a main shaft 21 which is a drive shaft of the rotating body 14 is suspended and supported between the rotor flanges 18 and 19 so as to be located at the center of the four sheath tube standby positions ST1, ST2, ST3 and ST4. The main shaft 21 is provided so that the four sheath tubes 17 can be rotationally positioned at 90 ° pitches in the embodiment. That is, the main shaft 21 has a hydraulic motor 23 whose main body is fixedly supported by the frame 13,
The main shaft 21 is rotatably connected to the main shaft 21 by 90 degrees via a drive gear 22.
The support shaft 251 shown in the lower part of FIG. 1 is fitted and supported by the support ring 25 fixedly supported by the frame 13, and the main shaft 21 is By the operation of rotating the shaft center CT0 through the hydraulic motor 23 in the directions of arrows M and N by 90 degrees,
The four sheath tubes 17 are connected to the respective standby positions ST1, ST2, S
T3 and ST4 can be moved and positioned with respect to each other, that is, the sheath pipe 17 is a connection pipe formed by the muddy water pipe receiving mechanism formed by the connection cylinder 35 and the movable pipe 12 fitted in the joint cylinder 15a. It is designed to be selectively positioned between the road mechanisms. Further, the support pipes 132 are provided above the four sheath tubes 17 of the rotating body 14 in FIG.
Is suspended and fixed between the stator flanges 15 and 16 by means of bolting or the like. Therefore, as described above, the main shaft 21 has the rotor flanges 18 and 1 of the rotor 14.
The four sheath tubes 17 which are movably positioned between the respective sheath tube standby positions ST1, ST2, ST3, ST4 by rotating 9 at a pitch of 90 degrees are provided between the frame 13 and the support pipe 132. The tube 17 has a material axis centered in a circle around the axis CT0 of the main shaft 21 as the center of rotation.
It is designed to rotate every time.

By the way, the four sheath tube standby positions ST
Out of 1, ST2, ST3, and ST4, the sheath pipe standby position S is located at the bottom of the pipe extension device 10 and is shown in the lower side of FIG.
T1 is a mud feeding line 70 in which the open end 9a, which is the tip of the mud feeding pipe 7A, can be disposed in the inside 17s of the sheath pipe 17 located at the sheath pipe standby position ST1 via the connecting cylinder 35.
, While the rest of the sheath tube standby position ST
2, ST3, ST4 are the sheath tube standby positions ST2, ST
3 and ST4, and the respective sheath pipes 17 in which the single pipes 9'are respectively housed therein are in the standby preparation position for moving sequentially to the sheath pipe standby position ST1 via the rotation of the main shaft 21. There is. As described above, the stator flanges 15 and 16 forming a pair in the front-rear direction correspond to the front and rear end positions of the sheath tube standby positions ST2, ST3, and ST4, and the front stator flange 15 has three ends. 15 s of plug withdrawal holes, and 3 cylinder mounting holes 16 s are formed in the rear stator flange 16 so as to penetrate the respective stator flanges 15 and 16 in the directions of arrows A and B. In the pipe extension device 10, the sheath pipe standby position S
Each sheath tube 17 located in each of T2, ST3, ST4
A pair of plug mechanisms 26, 27 which can open and close the interior 17s of the plug at both ends in the directions of arrows A and B,
In the embodiment, three plug retraction holes 15s and three cylinder mounting holes 16s can be opened and closed. In the embodiment, three plug mechanisms 26 and 27 are new single pipes to be added to the mud pipe 7A. 9'is configured to form a loading means capable of selectively loading each sheath tube 17 of the rotating body 14. On the other hand, the sheath tube 1 arranged at the sheath tube standby position ST1
7 has a shape in which both ends in the arrow A and B directions are always open toward the movable pipe 12 and the connection cylinder 35.
The inside 17s of the sheath pipe 17 positioned at the sheath pipe standby position ST1
Includes a connection cylinder 35 and a joint cylinder 15a.
A part of the mud-sending conduit 70 is always arranged in the inside 17s of the sheath pipe 17 so that the main flow of the mud water directly connecting the movable pipe 12 fitted to the inside can flow.

Further, in the sludge pipe line 70 arranged inside the sheath pipe 17 arranged at the sheath pipe standby position ST1 in the pipe extension device 10, the sheath pipe standby positions ST2, ST3 in the pipe extension device 10 are provided. , The bypass passages 70s and 70p of the shape which can communicate with the inside 17s of each sheath tube 17 arranged in ST4, that is, the inside of each single tube 9 accommodated therein are as shown in FIGS. , Between the stator flange 15 provided on the front side of the frame 13 and the rotor flange 18 of the rotating body 14, and between the rear stator flange 16 and the rotor flange 19 of the rotating body 14, respectively. The bypass flow passage 70s arranged on the rear side as one bypass flow passage connects the connecting cylinder 35 and each sheath pipe 17 located at each of the sheath pipe standby positions ST2, ST3, ST4. On the other hand, the bypass flow passage 70s arranged on the front side as the second bypass flow passage connects the movable pipe 12 and each sheath pipe 17 located at each of the sheath pipe standby positions ST2, ST3, ST4. Each is formed. Therefore, the sheath tube standby positions ST2, ST3,
The stator flange 1 is used as a loading means for opening and closing the front and rear of each sheath tube 17 located in each ST4.
The plug mechanisms 26 and 27 provided in Nos. 5 and 16 bypass the inside 17s of each sheath pipe 17 located at each of the sheath pipe standby positions ST2, ST3, and ST4 bypass passages 70p and 70.
It can communicate with or separate from s.

That is, in the rotor flange 18 to which the front sides of the four sheath pipes 17 are connected, as shown in FIG. 4, a bypass passage 70s is formed between the rotor flange 18 and the stator flange 15. A groove 18a for the purpose of forming an annular shape on the side of the front end surface 18b indicated by the end surface of the rotor flange 18 indicated by the arrow A in the circumferential direction along the arranging direction of the sheath tube standby positions ST1, ST2, ST3, ST4. The hole 18s of the rotor flange 18 is formed in the groove 18s of the rotor flange 18 in such a manner that the inside 17s of each sheath pipe 17 connected to the rotor flange 18 can communicate with the bypass passage 70s. As described above, it is arranged so as to penetrate in the directions of arrows A and B. And the sheath tube standby position ST2,
As shown in FIG. 2 or 4, each of the plug mechanisms 26 provided on the front side of ST3 and ST4 has a plug 29, which is a valve body that can open and close each hole 18s of the rotor flange 18. Through the plug opening / closing cylinder 30 provided on the side of the plug mechanism 26 in the direction of the arrow A, it can be driven backward and forward by the stroke length L2 of the opening / closing cylinder 30 in the directions of the arrows A and B, which are the tunnel axis directions. It is provided in. Therefore, in each plug mechanism 26, the sheath tube 17 positioned at each sheath tube standby position ST2, ST3, ST4 is moved by the operation of the plug 29 projecting and retracting in the directions of arrows A and B through the plug opening / closing cylinder 30. 17s of the inside of the bypass mud line 70
It is configured so that it can be isolated from or communicate with the s.

As shown in FIG. 2, the muddy water 20 in the inside 17s of the sheath pipe 17 positioned at the sheath pipe standby position where the plug mechanism 26 is provided is discharged and injected into the plug 29 of each plug mechanism 26. A muddy water collecting mechanism 28 having a shape capable of being formed is provided, and the muddy water collecting mechanism 28 is provided with an overflow port 291 and a water supply / drainage port 292 that can be opened / closed in the plugs 29 in the form of being arranged vertically in FIG. . As shown in the vicinity of the left end in FIG. 2, a tank 281 capable of storing a predetermined volume of muddy water 20 is connected to each overflow port 291 and the water supply / drainage port 292 via a pressure hose or the like. The recovery mechanism 28 is
Even when the plug 29 of the plug mechanism 26 closes the inside 17s of the sheath tube 17 arranged at the sheath tube standby positions ST2, ST3, ST4 to the outside as shown in FIG. 2 or FIG. Through the overflow port 291 and the water supply / drainage port 292, the muddy water 20 inside the sheath tube 17 can be freely discharged into the tank 281 or again from here.
Is configured to be injected into the interior 17s of the. Further, in the plug 29 of the plug mechanism 26, a sealing rubber 293 formed in an annular shape along the outer periphery of the plug 29 is fitted in the vicinity of the protruding end side in the direction of the arrow B in FIG. The plug 29 has an arrow A,
By protruding and retracting in the B direction, the seal rubber 293
Is connected to the outer peripheral portion of each hole 18s of the rotor flange 18 or the outer peripheral portion of the plug retraction hole 15s of the stator flange 15 shown in FIG.
Can be connected to and separated from the rotating body 14.

On the other hand, the bypass passage 70p is provided between the rotating body 14 and the stator flange 16 on the rear side.
Rotor flange 1 for supporting the rear side of four sheath tubes 17 of 4
9 and the stator flange 16 are arranged and formed here corresponding to a space 40 portion. The bypass flow passage 70p has a connection cylinder 35 with respect to the rotor flange 19 or the rotor 14, as will be described later. By retreating in the direction of the arrow B, the connecting cylinder 35 and the inside 17s of the sheath pipe 17 are communicated with each other via the space 40, and are communicable with the mud-sending conduit 70. The plug mechanism 27 provided to open and close the rear side of each of the sheath pipes 17 arranged at the sheath pipe standby positions ST2, ST3, ST4 has a loading port 33 as described later. Is formed toward the gallery 5 and the inside 1 of the sheath pipe 17 is opened from here.
At the same time as configuring a loading means for selectively loading a new single tube 9'in 7s, the sheath tube standby positions ST2, S
It serves as plug means for opening and closing the inside 17s of the sheath pipe 17 arranged at T3 and ST4 with respect to the bypass flow passage 70p.

That is, as shown in FIG. 2, the plug mechanism 27 has an open / close cylinder 32 formed in a cylindrical shape as a valve body that can open and close the rear side of the sheath tube 17, and the open / close cylinder 32 is The cylinder mounting hole 16 of the stator flange 16 is formed so as to project and retreat in the directions of arrows A and B relative to the stator flange 16 by a stroke length L2 that is substantially the same as the stroke length L2 of the plug opening / closing cylinder 30.
It is fitted and attached to s. Inside the opening / closing cylinder 32, a cap plug 31 that is a plug body formed in a rollover inner hollow column shape is provided on the right end side in FIG.
By pulling 11 in the direction of the arrow B, it can be pulled out from the inside of the opening / closing cylinder 32.
The inside 1 of the sheath pipe 17 located at the sheath pipe standby positions ST2, ST3, ST4 via the open / close cylinder 32 from which
It is detachably provided so that 7s can communicate with the gallery 5 which is the outside. Therefore, the plug mechanism 27 includes the open / close cylinder 32, which is a valve body, and the cap plug 31, which is a plug body that is detachably fitted and attached to the open / close cylinder 32, and the rotor flange 1 corresponding to each of the sheath tube standby positions ST2, ST3, and ST4.
9 and the cylinder mounting hole 16s of the stator flange 16 can be closed and opened. The opening / closing cylinder 32 has a protruding / retracting movement operation and a cap plug 31.
Depending on the attached / detached state, it is possible to freely select whether the inside 17s of the sheath pipe 17 provided with the plug mechanism 27 is communicated with the bypass flow passage 70p or the outside tunnel 5 or is shielded. Is configured to get.

Further, the cap plug 31 mounting region inside the opening / closing cylinder 32 fitted in the cylinder mounting hole 16s of the stator flange 16 has the sheath tube standby positions ST2, ST.
3, new single tube 9'on each sheath tube 17 arranged in ST4
Therefore, the cap plug 31 serves as an opening / closing plug of the loading port 33, that is, a plug for closing the loading port 33 which is a space portion for communicating the inside 17s of the sheath tube 17 with the outside. It is in the form of. Further, a seal rubber 321 equivalent to the seal rubber 293 attached to the projecting tip side of the plug 29 is annularly fitted to the outer periphery of the opening / closing cylinder 32 at the end of the opening / closing cylinder 32 on the arrow A direction side. It is fitted together,
In the opening / closing cylinder 32, the seal rubber 321 causes the rotor flange 19 to move when the opening / closing cylinder 32 moves in the directions of arrows A and B.
The opening / closing cylinder 32 is connectable / separable to / from the rotor flange 19 by being connected to the outer peripheral portion of the hole 19s of the stator flange 16 or the outer peripheral portion of the mounting area of the opening / closing cylinder 32 of the stator flange 16.

By the way, as described above, the pipe extension device 10 is connected to the flexible pipe 11 so as to form the connection line mechanism of the pipe extension device 10 in the form of being arranged on the front side of the sheath pipe standby position ST1. The movable pipe 12
Is a portion of the stator flange 15 that is movable in a projecting / retracting manner in the directions of arrows A and B with respect to the front stator flange 15 by a stroke length L2 corresponding to the stroke length L2 of the plug 29 and the opening / closing cylinder 32. It is fitted in a joint cylinder 15a provided at the lower left of FIG. 2 and is provided in a tubular shape, and the movable tube 12 is directed to the groove 18a of the rotor flange 18 through its movement operation in the directions of arrows A and B. The bypass pipe line 70s is configured to be able to enter or retract from the bypass pipe line 70s in such a manner as to enter and retract. When the movable pipe 12 exhibits the most protruding state toward the arrow B direction side, the sheath pipe standby position S
A new single tube 9'for replenishment accommodated in the sheath tube 17 arranged at T1 can be moved by pushing toward the arrow B direction side which is the rear side of the tube extension device 10. It is configured.

Further, in the pipe extension device 10, in the form of being arranged on the arrow B direction side which is the rear side of the sheath pipe standby position ST1,
The connecting cylinder 35 for receiving the single pipe 9 at the foremost position of the installed muddy water pipe 7A into the pipe extension device 10 has a stroke length L2 corresponding to the stroke length L2 of the plug 29, the opening / closing cylinder 32 and the movable pipe 12. Is provided in a stepped cylindrical shape so that it can be projected and retracted in the directions of arrows A and B with respect to the stator flange 15, and is inserted into the connection cylinder 35 in the vicinity of the rear end of the connection cylinder 35. A pipe seal 36 formed of a flexible material, each of which has an annular shape, for sealing between the outer circumference of the single pipe 9 received in the pipe extension device 10 in the direction of arrows A and B. It is provided side by side. A seal rubber 293 is attached to the protruding tip side of the plug 29 at the arrow A side end which is the protruding tip of the connection cylinder 35.
Also, a seal rubber 351 equivalent to the seal rubber 321 attached to the protruding tip side of the opening / closing cylinder 32 is attached in an annular shape along the front end edge portion of the connection cylinder 35, and the connection cylinder 35 has arrows A, B. The seal rubber 351 is connected to the outer peripheral portion of the hole 19s formed in the rotor flange 19 or to the inner peripheral surface of the penetrating portion of the connecting cylinder 35 in the stator flange 16 by the movement in the direction. The cylinder 35 is connectable to and separable from the rotor flange 19.

Further, as shown in FIG. 2, on the rear side of the connecting cylinder 35 in the direction of the arrow B, a hydraulic clamp 37 whose main body is fixedly supported on the frame 13 is provided. Via the grip 37a of 37,
The single pipe 9 inserted into the connection cylinder 35 is provided so as to be able to grip the outer peripheral portion thereof, and the pipe extension device 10 is also provided.
The rotor flange 19 on the rear side of the four sheath tubes 17.
A cleaning mechanism 39, which is formed between the stator flange 16 and the stator flange 16 and can clean the space 40 portion used as the bypass flow passage 70p, supplies water into the space 40 from the water absorption port 391 provided in the upper right part of FIG. , This is shown in FIG.
It is provided so that it can be discharged freely from the drainage port 392 provided in the lower right part. The space 40 is connected to the connection cylinder 3 through the movement of the connection cylinder 35 in the directions of arrows A and B.
5 is formed so as to be able to communicate with the internal space of 5, but is formed inside the single pipe 9 that is inserted into the connecting cylinder 35 via the seal rubber 351 during the mud feeding operation shown in FIG. 2 in the pipe extension device 10. The mud-sending conduit 70 and the bypass passage 70p formed in the space 40 are blocked.

Further, appropriate seal packing is provided between the respective members constituting the pipe extension device 10, and the rotor flange 1
8, 19 and four sheath tubes 17 fixed thereto, the rotation operation, the plug mechanisms 26, 27, the movable tube 12 and the connecting cylinder 35 projecting and retracting, and the frame 13 of the tube extension device 10. Is provided everywhere in a manner that does not hinder the traveling movement operation of the mud water. Therefore, the mud sending pipe 70 of the mud equipment 7 constitutes the mud sending pipe 7A which has already been installed. As shown in FIG. 2, the single pipe 9 inserted into the connection cylinder 35 while being held by the holding portion 37a of the hydraulic clamp 37 and the sheath pipe standby position ST1 connected to the single pipe 9 Is located in the innermost 17 s of the sheath tube 17 that is located at the foremost position, or is a new single tube 9'to be connected here, or is located at the sheath tube standby position ST1. Pipe 17s inside the sheath tube 17 itself The discharge pipe is discharged into the extension device 10 and selectively communicates with the bypass flow passages 70p and 70s, and passes through the inside of the movable pipe 12 fitted in the joint cylinder 15a to open the movable pipe 12 on the left side in FIG. The face 5 is fed to the shield device 2, that is, from the side of the well hole 5c, in the form of being sent to the flexible pipe 11 from the discharge port 12a which is the end.
It is configured so that the muddy water 20 can be supplied to the a side.

By the way, when the mud is sent by the pipe extension device 10, one single pipe 9 is arranged in the sheath pipe 17 located at the sheath pipe standby position ST1, and the muddy water 20 is passed through the single pipe 9. There is a case where the supply is performed, and there is a case where the sheath pipe 17 itself forms the mud-sending line 70.
As shown in FIG. 7, the joint portion of the pair of single pipes 9 that are in a disconnected state and are connected to each other in the inside of 0 is a sheath located at the sheath pipe standby position ST1 with the connection cylinder 35. It is shaped to be located between the tubes 17. A female joint portion 91 is formed at the end of the single pipe 9 in the direction of arrow B over the entire inner circumference at the joint portion with the adjacent single pipe 9 in each single pipe 9. An engaging groove 91a is formed in 91. On the other hand, a male joint portion 92 is formed at the end portion of each single pipe 9 in the direction of arrow A over the entire outer circumference. The male joint portion 92 has an engaging projection 92a and the female joint portion 91 has an engaging groove. It is formed in an annular shape so that it can engage with 91a. The engaging projection 92a is provided with the muddy water pipe 7.
7 has a shape that can be expanded and contracted in the directions of arrows G and H, which are inside and outside in the radial direction of the cross section, that is, the engagement projection 92a is formed in, for example, a split annular shape and corresponds to the inner diameter of the female joint portion 91. A ring-shaped member whose diameter can be freely reduced to the above diameter is fastened to the male joint 92 in a state of being urged toward the arrow G direction side which is the outer side in the radial direction via an appropriate spring means. Then, the single pipes 9 adjacent in the directions of the arrows A and B,
9 is a form in which the male joint portion 92 is pushed into the female joint portion 91, and as shown in FIG. 8, it is configured so that one can be joined to the other, and the male joint portion 92 and Appropriate O-rings, seals, and the like are provided between the female joint portion 91 and the joint portions of the single pipes 9 to be joined so that the joint portions are sealed. It should be noted that the female joint 91 has a pin insertion hole (not shown) for inserting a pin for reducing the diameter of the engagement projection 92 provided on the male joint 92 toward the arrow H direction side which is the radial inner side. The single pipes 9, 9 that are formed by boring and are joined as described above are configured so that the engagement can be released by inserting an engagement release pin into the pin insertion hole.

Since the tunnel 1 and the shield device 2 and the like for constructing the tunnel 1 have the above-described structure, in order to construct the tunnel 1, the cutting blade portion of the shield device 2 is driven to rotate and the ground 3 is formed. Opening up the cross section in the form of a circle,
By sequentially erection and lining the segments in the shield device 2 so as to directly connect to the rear of the shield device 2,
It is formed by advancing from the direction side toward the direction A side. Thus, when the tunnel 5 is to be formed by carving the ground 3, the face 5a is disturbed by the shield cutting blade and has not yet been lined with a segment, resulting in an unstable state and slipping. And try to collapse. Therefore, when excavating the ground 3, the mud water 20 is pressure-fed from the inside of the partition wall of the shield device 2 to the cutting blade via the mud-feeding conduit 70 of the mud equipment 7 to secure the stability of the face 5a. While excavating. Further, the scraps formed by the shield cutting blade excavating the ground 3 are mixed with the mud water 20 pressure-fed by the mud-feeding conduit 70 as described above, and this is removed by the debris removal device of the shield device 2. After removing the debris through the pipe, the sludge is discharged to the outside of the gallery 5 in the form of sludge in the direction of the arrow B through a sludge discharge line (not shown) configured similarly to the mud transport line 70, The face 5a is quickly removed, and the shield cutting blade is always smoothly rotated on the face 5a.

Therefore, at the time of excavating the face 5a by rotating the shield cutting blade, it enters into the pipe extension device 10 from the rear side in a form received through the connecting cylinder 35, and reaches the most front position of the mud pipe 7A. As shown in FIG. 9, the open end 9a of the single pipe 9 arranged at the position shown in FIG. 9 is connected to the left end portion POS1 of FIG. 9 of the front end portion of the sheath pipe 17 positioned at the sheath pipe standby position ST1 shown in the lower side of FIG. Position them so that they are arranged.
In this state, in order to feed the muddy water 20 to the shield device 2 via the mud feeding line 70, the rear end of the plurality of single pipes 9 (the end on the arrow B side) forming the mud feeding pipe 7A from the wellhead 5c. Part), and the muddy water 20 is pressure-fed in the direction of arrow A at a predetermined pressure through a pressure-fed pump facility (not shown) or the like. Then, the muddy water 20 supplied from the wellhead 5c to the mud transport pipe 7A passes through the mud transport pipe 70, and as shown in FIG. 9, the open end of the single pipe 9 at the most front position of the mud transport pipe 7A. 9a is discharged into the pipe extension device 10 and is discharged into the flexible pipe 11 from the discharge port 12a shown at the left end of FIG. Then, the muddy water 20 discharged into the flexible pipe 11 is pressure-fed and supplied to the upper part of the partition wall of the shield device 2 or the like to maintain the stability of the face 5a. In addition, since the scraps excavated and formed by the cutting face 5a are mixed with the mud water 20 supplied to the cutting face 5a and discharged to the wellhead 5c through the mud discharge pipe line as described above, the mud pipe 7A and the mud water 20 are circulated. The inside of the sludge pipe is pressure-fed in the direction of arrow B through the sludge pipe in the opposite direction, and the wellhead 5
Discharge from the c etc. to the outside of the gallery 5.

In this way, the mud water 2 is supplied by the mud pipe 7A.
When 0 is sent to the face 5a, in the pipe extension device 10, the sheath pipe standby positions ST2, ST3, ST shown in the upper side of FIG.
In the sheath pipe 17 arranged in No. 4, is there a state in which new single pipes 9'to be added to the single pipe 9 forming the most leading position of the mud pipe 7A are stored here respectively? ,
Alternatively, a loading operation for storing the sheath tube 17 is being performed. Therefore, the sheath tube standby positions ST2, S
The open / closed states of the plug mechanisms 26 and 27, which are the open / close mechanisms for the front and rear of the respective sheath pipes 17 arranged at T3 and ST4, are, for example, on the plug mechanism 26 side, the closed state shown in FIG. Any one of the open states shown is exhibited. At this time, the pipe extension device 10 includes the plug mechanisms 2
Since each of the sheath tubes 17 is configured to be individually closed via front and rear via 6 and 27, only the sheath tubes 17 for which the above-mentioned single tube 9'is loaded are already separated. The sheath pipe 17 in which the pipe 9 ′ is housed and the sheath pipe 1 located at the sheath pipe standby position ST1 which is the mud transport line 70
7 is pressure-isolated (that is, the state shown in the upper side of FIG. 5), and the loading operation is performed here. In the other sheath pipes 17, the single pipe 9 ′ accommodated therein is in the standby state. Position S
In the state of communicating with the single pipe 9 in the sheath pipe 17 disposed at T1 (that is, the communication state of the bypasses 70s and 70p), the muddy water 2
It is possible to perform the mud sending work without leaking 0 to the outside of the pipe extension device 10. Therefore, in this state, the plug mechanism 2
Sheath tube standby positions ST2 and S where 6 and 27 are in the retracted open state
Inside the single pipe 9 ′ housed in each sheath pipe 17 located at T3 and ST4, the muddy water 20 in the mud pipe 7A is passed through the bypass pipes 70p and 70s formed in the pipe extension device 10.
Each of the single pipes 9 ′ already stored in the unfilled sheath pipe 17 is filled with muddy water 20 of a predetermined pressure in a form of flowing into each of the single pipes 9 ′.

If the shield device 2 advances in the direction of arrow A as the shield device 2 excavates the face 5a, the provisional rail 6 is extended in the direction of arrow A so as to follow this without delay. The trailing carriage of the shield device 2 must be moved forward, and the mud sending pipe 70 of the mud equipment 7 must be extended in the direction of arrow A together with the mud discharging pipe.
In order to extend the mud pipe 70 in the direction of arrow A, the mud pipe 7A is extended by adding a single pipe 9'for extension to the single pipe 9 at the foremost position using the pipe extension device 10. Then, the pipe extension work is performed. Since the flexible device 11 can be deformed to extend the shield device 2 to some extent without extending the mud pipe 7A, the device 2 corresponds to the length L1 of one single pipe 9. When it advances in the direction of arrow A, the mud pipe 7A is extended.

Therefore, a method for extending the mud pipe 7A will be described below with reference to FIGS. 9 to 11.
In Fig. 0, for convenience of explanation, the sheath tube standby position ST1 is set on the lower side in these figures, while the sheath tube standby position ST2 is set on the upper side of the sheath tube standby position ST1. Once set, the sheath tube standby positions ST1, S
It is assumed that T2 is arranged at a position forming 90 degrees with respect to the main shaft axis. At the time of excavating the face 5a (that is, during mud feeding), as described above, the open end 9a of the single pipe 9 that constitutes the most leading portion of the mud feeding pipe 7A is as shown in FIG. 9 is located at the left end arrow POS1 in FIG. 9 of the sheath pipe 17 located at the sheath pipe standby position ST1. From this state, first, the frame 13 is connected to the single pipe 9 via the temporary rail 6.
Is moved forward in the direction of arrow A by a length corresponding to the length L1. During the movement operation of the frame 13, if the hydraulic clamp 37 is released as shown in FIG. 10, the frame 13 is laid so that the single pipe 9 inserted into the connection cylinder 35 passes through the inside of the grip portion 37a. Already sent mud pipe 7A
Move forward easily against. Then, as shown in FIG. 10, the single pipe 9 in the sheath pipe 17 positioned at the sheath pipe standby position ST1 by the forward movement operation of the frame 13 is
In contrast, the opening end 9a of the single pipe 9 is retracted to the POS2 position which is the rear side of the sheath pipe 17 arranged at the sheath pipe standby position ST1. The movement of the single pipe 9 forming the foremost part of the mud pipe 7A in the direction of arrow B with respect to the sheath pipe 17 is relative to the forward movement of the frame 13, Pipe extension device 1 for the already installed mud pipe 7A
The portion arranged on the rear side of 0 is temporarily fixed to the invert 5b or the like as described above, and does not move at all. In this way, the opening end 9a of the mud pipe 7A is shown in FIG.
When retracted to the 2 position, a single pipe 9'for extension is added to the sheath pipe standby position ST1 shown in the lower side of Fig. 10 by arranging it between the open end 9a and the movable pipe 12. A void SP is obtained. Therefore, the pipe extension work is performed by loading a new single pipe 9'into the space SP formed at the sheath pipe standby position ST1 and connecting the new single pipe 9'to the single pipe 9 whose open end 9a is retracted to the POS2 position. Do, but actually single tube 9, 9 '
Until the gap is connected, that is, while the void SP is formed in the sheath pipe 17 arranged at the sheath pipe standby position ST1 as shown in FIG. Since the inside 17s of the sheath pipe 17 itself arranged at the sheath pipe standby position ST1 is inserted, the mud feed is not interrupted. That is, the forward movement of the frame 13 causes the single pipe 9 sent to the rear side of the pipe extension device 10 to move to the connecting cylinder 3
The pipe seal 36 provided at the rear portion of the pipe 5 seals the inner peripheral surface of the connecting cylinder 35 and the outer peripheral portion of the single pipe 9 in multiple layers in the front-rear direction.
Is prevented from leaking to the outside of the pipe extension device 10, so that the mud can be continued without leaking the mud water 20 while the frame 13 is moving forward.

Therefore, the forward movement of the frame 13 causes the single pipe 9 placed in the sheath pipe 17 at the sheath pipe standby position ST1.
When the open end 9a of the plug mechanism 26 is retracted to the POS2 position as shown in FIG.
9, the open / close cylinder 32 of each plug mechanism 27, the movable pipe 12 and the connecting cylinder 35 are driven backward as shown in FIG. , The movable pipe 12 and the connecting cylinder 35 are cut from the front and rear rotor flanges 18 and 19, respectively.
9, 32, 12, 35 are connected and retracted to the stator flanges 15, 16 side. The plug 29 and the opening / closing cylinder 3
2, the movable pipe 12 and the connection cylinder 35 are provided with seal rubbers 293, 321 provided on the respective projecting tip sides thereof.
In the retracted retracted state shown in FIG. 10 via the 351 or the like, the plug retracting hole 15s of the stator flange 15 or the joint cylinder 15a, or the stator flange 1
6 is in a state of being watertightly connected to the inner peripheral portion of each of the cylinder mounting hole 16s of 6 or the connecting cylinder 35 and the front end edge portion thereof. The muddy water 20 does not leak into the gallery 5 from the pipe extension device 10 by continuing the pressure-feeding of the pipe extension device 10.

Thus, the plug 29 and the opening / closing cylinder 32
1 together with the movable pipe 12 and the connecting cylinder 35.
0, front and rear rotor flanges 18,
When edging from 19, the rotor 14 constituted by the rotor flanges 18, 19 and the four sheath tubes 17 suspended between them is released in a rotatable manner with respect to the stator flanges 15, 16. It Along with this, between the rotor 14 and the front and rear stator flanges 15 and 16, respectively,
The bypass flow passages 70s and 70p and the bypass flow passage 70p are located inside the connecting cylinder 35. The mud-sending pipe passage 70 extends from the open end of the connecting cylinder 35 to the sheath pipe standby positions ST2, ST3 and ST4 via the space 40 portion. In the bypass passage 70s, the inside 17s of the sheath pipe 17 arranged at the sheath pipe standby positions ST2, ST3, ST4 is fitted to the joint cylinder 15a so as to communicate with the inside 17s of the sheath pipe 17 arranged. It is formed separately from the mud sending pipe 70, which is the main stream of the mud sending water, in the form of communicating with the mud sending pipe 70 inside the movable pipe 12 thus formed. In this state, the hydraulic motor 23 and the drive gear 22
By rotating the main shaft 21 by a predetermined rotational drive amount via the rotary shaft 14, the rotating body 14 is rotated by 90 degrees in the arrow M direction (or N direction) with the axial center CT0 of the main shaft 21 as the rotation center. In addition, as described above, in FIGS. 9 to 10, the sheath tube standby position ST is located at a position 90 degrees with respect to the sheath tube standby position ST2 shown in the upper part of these figures.
1 is arranged. Therefore, when the rotary body 14 is rotated through 90 degrees in the direction of the arrow M through the main shaft 21 in this way, the four sheath tubes 17 are moved to the position where they are arranged by 90 degrees, and the four sheath tubes 17 are positioned there. Thus, the single pipe 9 is retracted from the inside so that the sheath pipe standby position ST1 is arranged first (in the state shown in FIG. 9) and the opening end 9a is arranged at the rear side POS2 position by the forward movement of the frame 13. As shown in FIG. 3, the sheath tube 17 is moved to the sheath tube standby position ST1.
90 degrees from the sheath tube standby position ST4 located on the arrow M direction side
Move to a part and move to a part not shown in FIG.
At the same time, in the sheath tube standby area ST1 where the void SP was formed by the withdrawal of the single tube 9, the sheath tube standby position ST2 was previously arranged (in the state shown in FIG. 9) and the inside 17
The sheath tube 17 in which one single tube 9'is stored is arranged in s,
As a result, a new single tube 9'is arranged in series in the space ST with its material axis aligned with the material axis of the single tube 9 forming the head portion of the mud pipe 7A. . Although the new single pipe 9'is not yet connected to the single pipe 9 forming the foremost portion of the muddy water pipe 7A, the plug 29 and the opening / closing cylinder are provided prior to the rotational driving operation of the rotating body 14 described above. Three
2. When the connecting cylinder 35 is retracted, the plug 29 and the opening / closing cylinder 32 are closed.
The mud water 20 in the mud sending conduit 70 is in a state of flowing with a pressure substantially equal to that of the mud sending conduit 70 inside each single pipe 9'through the bypass flow paths 70s and 70p communicating with the mud sending conduit 70 '. Therefore, in the inside of the new single pipe 9'in the sheath pipe 17 which is now newly arranged at the sheath pipe standby position ST1, before it is rotationally moved to the sheath pipe standby position ST1, and during the rotating operation. The muddy water 20 having a predetermined pressure substantially equal to that of the mud-sending conduit 70 continues to flow. That is, during the rotating operation of the rotating body 14, the sheath tubes 17 of the rotating body 14 move to the sheath tube standby positions adjacent to each other by 90 degrees in such a manner that their positions are interchanged. Therefore, during the rotating operation of the rotating body 14, the sheath tube 17 is placed between the connecting cylinder 35 and the movable pipe 12 at the sheath tube standby position ST1 used as the mud conveying line 70 except during the rotating operation. Appears, but at this time the installed mud pipe 7A
The muddy water 20 discharged into the pipe extension device 10 at the POS2 position of the open end 9a of FIG. 10 passes through the inside 17s of each sheath pipe 17 through the bypass flow passage 70p and the bypass flow passage 70s as shown in FIG. In the form of being pumped to the movable pipe 12 side, the state of circulation at a predetermined pressure is continued. Therefore, even when the sheath pipe 17 is rotated through the main shaft 21 and when the new single pipe 9'in the sheath pipe 17 is still not connected to the single pipe 9 of the installed muddy water pipe 7A, it is movable. Tube 1
The discharge pressure of the muddy water 20 discharged from the second discharge port 12a to the flexible pipe 11 does not decrease, and the mud feeding can be always continued in a predetermined state.

When the new single tube 9'is thus arranged at the sheath tube standby position ST1, the open end 9a of the single tube 9 retracted to the POS2 position as described above and the new single tube to be joined thereto. 7, the male joint portion 92 of the single pipe 9 is connected to the new single pipe 9 ′ at the POS2 position, which is the retracted position of the open end 9a of the single pipe 9, as shown in FIG. The shape faces the female joint portion 91. Therefore, in this state, as shown in FIG. 11, first, the hydraulic clamp 37 is driven to grip the outer peripheral portion of the single pipe 9 already laid by the grip portion 37a. In this way, when the movable pipe 12 is driven to project in the direction of arrow B, the movable pipe 12 is in the most projecting state, and is in the sheath pipe standby position ST.
The new single pipe 9'disposed in No. 1 is pushed in the direction of the arrow B to fit the female joint portion 91 of the new single pipe 9'to the male joint portion 92 of the single pipe 9. That is, as shown in FIGS. 7 and 8, the new single tube 9 ′ has the engagement projection 92 a on the single tube 9 side via the inner peripheral surface of the female joint portion 91.
By once reducing the diameter toward the direction of the arrow H, which is the inner side of the radial direction, and moving the single tube 9 ′ in the direction of the arrow B,
When the engagement protrusion 92a and the engagement groove 91a are aligned and aligned, the once reduced diameter engagement protrusion 92a is replaced with the engagement protrusion 92a.
The engagement groove 9 on the side of the single pipe 9'via the spring force applied to itself.
1a, the male joint portion 92 and the female joint portion 91 are engaged with each other so as to expand in the arrow G direction which is the outer side in the radial direction. As a result, the single pipes 9 and 9'are joined by one-touch without trouble such as bolt tightening, that is, a new single pipe 9'is formed on the single pipe 9 which was the most leading part of the mud transport pipe 7A. The mud pipe 7A is replenished to form a single pipe 9 having a length L.
It is extended by the length corresponding to 1 (that is, only the length sentence corresponding to the amount of forward movement of the frame 13). It should be noted that the single pipes 9 and 9'which are once joined via the joint portions 91 and 92 in this manner are firmly engaged so that they cannot be disengaged unless the engagement release pins or the like are inserted into the pin insertion holes. Are combined. In addition to this, between the single pipes 9 and 9 adjacent in the directions of arrows A and B, the male joint portion 92 and the female joint portion 9 are provided.
By providing an O-ring, etc. with 1,
The mud-sending conduit 70 is continuously formed in the directions of arrows A and B so that the mud water 20 cannot leak from between the single pipes 9 and 9 '. The mud sending operation of the mud water 20 is continued during the joining operation of the single pipes 9 and 9 ′ thus performed. In this way, the end of the newly joined single pipe 9'on the side of arrow A, which is the non-joined side open end, becomes a new open end 9a in the mud pipe 7A, and the open end 9a is again shown in FIG. Sheath tube standby position ST shown in
The mud feeding is continued by arranging it at position 1 of POS 1.

On the other hand, as described above, in the state shown in FIG.
90 ° rotation operation of the sheath tube standby position ST shown in FIG.
The sheath tube 17 moved to No. 4 is in a state in which the single tube 9 is not yet housed inside the sheath tube 17. Therefore, in the pipe extension device 10, the sheath pipe standby positions ST2, ST
In any of 3 and ST4, the cap plug 31 which is the plug body is pulled out from the opening and closing cylinder 32 which is the valve body to form the loading port 33, and the empty sheath tube 17 is formed through the loading port 33. A new single tube 9'is sequentially loaded.
Therefore, the pipe extension device 10 can be moved forward in the gallery 5 following the frame 13 of the pipe extension device 10 in a form of being arranged on the arrow B direction side which is the rear side of the pipe extension device 10. The single pipe supply means is connected to the sheath pipe standby positions ST2, ST3, S
In a form aligned with any one of the positions of the cap plugs 31 of T4, it is prepared on the rear side thereof, and the empty sheath pipe 17 is sequentially loaded with new single pipes 9'through the single pipe supply means. As soon as possible, all the sheath tubes 17 are put in the state in which the single tube 9'is stored as quickly as possible. As a result, the pipe extension device 10 is able to supply the new single pipe 9 for extending the mud transport pipe 7A even if the supply of the new single pipe 9 is interrupted due to some circumstances that may occur during the construction process. The at least four single pipes 9 minutes accommodated in the sheath pipe 17 extend the mud feeding pipe 7A without delay, that is, the mud feeding stops during that time, which hinders the excavation work of the cutting face 5a. Coming is avoided.

In order to load a new single tube 9'into the empty sheath tube 17, first, as shown in FIG.
7 is arranged, for example, in FIG. 11, the plug mechanism 26 on the arrow A direction side, which is the front side of the sheath tube standby position ST4 in FIG. 11, is driven, and the plug 29 is provided on the protruding tip thereof toward the arrow B direction side. The seal rubber 293 is protruded until it abuts on the front end (the end on the arrow A side) of the sheath pipe 17 at the bottom portion of the hole 18s of the front rotor flange 18, and the hole 18s is closed via the plug 29 in the protruding state. The left end of FIG. 11 of the sheath pipe 17 arranged at the sheath pipe standby position ST4 is closed. At this time, depending on the protruding state of the plug 29, the groove 18 of the rotor flange 18 is formed such that the outer peripheral surface of the plug 29 is connected to the inner peripheral surface of the hole 18 s of the rotor flange 18.
a, so that the plug 29 can move the inside 17s of the sheath pipe 17 located at the sheath pipe standby position ST4 from the bypass flow passage 70s formed between the rotor flange 18 and the stator flange 15. Cut off. At the same time, the opening / closing cylinder 32 is driven to project in the arrow A direction, and the seal rubber 321 fitted to the projecting tip is connected to the outer peripheral surface of the hole 19s of the rear rotor flange 19. As a result, the hole 19s of the rotor flange 19 and the cylinder mounting hole 16s of the stator flange 16 have the opening / closing cylinder 32 and the cap plug 31 fitted therein.
The inside 17s of the sheath pipe 17 which is closed by the sheath pipe standby value ST4 and is formed by the bypass passage 70p formed between the rotor flange 19 and the stator flange 16, or It is cut off from the tunnel 5 that is outside the pipe extension device 10. That is, the inside 17s of the sheath pipe 17 arranged at the sheath pipe standby position ST4 is not attached to the outside except the inside 17s by the protruding arrangement of the plug 29 and the opening / closing cylinder 32 in which the cap plug 31 is fitted therein. It becomes a shielded and isolated form against.

In this state, in the sheath tube 17 arranged at the sheath tube standby position ST4, the sheath tube standby position ST1
Since it was used as a part of the mud transmission line 70 when it was placed in the above position, the muddy water 20 still remains in the inside 17s of the sheath pipe 17 at a pressure substantially equal to the muddy water pressure of the muddy water line 70. It is in a filled state. Therefore, the plug 29
In the sheath pipe 17 which is closed through the plug and still has the pressure muddy water filled in the inside 17s thereof, the pressure is discharged through the overflow port 291 of the muddy water recovery mechanism 28 provided in the plug mechanism 26 in the closed state. In this way, the pressure in the inside 17s of the sheath pipe 17 is released, and the mud water 20 filled therein is once drawn out and collected in the tank 281.
In this way, when the cap plug 31 is pulled out from the open / close cylinder 32 in the form of pulling the gripping portion 311 toward the direction of the arrow B, which is the rear side of the pipe extension device 10, the sheath arranged at the sheath pipe standby position ST4. On the rear side of the pipe 17, a loading port 33 which is a space formed inside the opening / closing cylinder 32 by removing the cap plug 31 is provided, and an inside 17s of the sheath pipe 17 is outside the pipe extension device 10. It is formed here in a form that communicates with. Therefore, from the loading port 33 formed in this way, through the above-mentioned single pipe supply means or the like, the sheath pipe standby position ST4 is provided and the inside 17s thereof is placed.
The empty sheath tube 17 is loaded with a new single tube 9'from the rear side. Then, after that, the cap plug 31 is loaded and fitted inside the opening / closing cylinder 32. In this state, the air in the single tube 9'which is newly loaded and replenished in the sheath tube 17 is replaced by the plug 2
The overflow port 291 and the water supply / drainage port 292 of the tank 9 are used to recover the tank 28 from the inside of the sheath pipe 17 first.
In the form of returning the muddy water 20 stored in 1 into the single pipe 9 ′,
The muddy water 20 having a predetermined pressure is replaced.

Thus, the sheath tube 17 which has been disposed at the sheath tube standby position ST4, ie, the sheath tube standby position ST1 previously (in the state shown in FIG. 9), is moved forward by the frame 13 to move the open end 9a. The single tube 9 is retracted from the inside so that the tube is placed at the POS2 position on the rear side thereof, whereby the sheath tube 17 whose inside 17s is empty is refilled with a new single tube 9 ', The inside of the single pipe 9'is filled with muddy water 20 having a predetermined pressure. Therefore, in this way,
For example, at the sheath tube standby position ST4, in order to replenish and fill the empty sheath tube 17 with a new single tube 9 ', the plug tube 29 and the opening / closing cylinder 32 are arranged so as to project therefrom.
The inner 17s of the sheath pipe 17 to be arranged only in No.
In addition, since the replenishment and loading work of the new single pipe 9'can be performed in a state of being isolated from the bypass flow passages 70s and 70p, the mud feeding line 70 side is flexible even during the replenishment and loading work. Mud can be continued without lowering the pressure of the muddy water 20 discharged into the pipe 11. In this way, the plug mechanism 26 is opened by driving the plug 29 corresponding to the sheath tube 17 at the sheath tube standby position ST4, in which the new single tube 9'is replenished and loaded into the inside 17s thereof, again in the direction of arrow A to drive the plug 29 backward. Then, the plug 29 is retracted into the plug retracting hole 15s of the stator flange 15,
Through the hole 18s through which the plug 29 has come out, the sheath flange standby position ST is re-established.
The inside 17s of the sheath tube 17 of No. 4 communicates with the bypass flow passage 70s. Similarly, when the open / close cylinder 32 and the connecting cylinder 35 are respectively retracted, the inside 1 of the sheath pipe 17 is
7s also communicates with the bypass flow passage 70p. As a result, the inside of the single pipe 9'which has been newly refilled in the sheath pipe 17 is in a state of communicating with the bypass flow passages 70p and 70s, but at this time, the single pipe 9'where the plug 29 has been opened. Since the inside thereof is already filled with the muddy water 20 at a predetermined pressure from the tank 281 through the muddy water collecting mechanism 28, the connection conduit mechanism of the pipe extension device 10 is opened even when the plug 29 is opened. The mud water discharged from the movable pipe 12 is a risk of pressure drop, and the mud water 20 is always sent in a stable state through the mud water conduit 70. In addition, pipe extension device 1
The space between the rotating body 14 and the stator flange 15 or 16 used as the bypass flow passages 70s and 70p in 0 can be cleaned in a flushing manner via the cleaning mechanism 39 provided in the space 40. The device 10 is kept in a good state in which its watertightness is always kept good and the muddy water 20 is not clogged therein.
It can be used for a long time.

Thus, the sheath tube standby positions ST2, ST3,
The single pipe 9'is housed in the inside 17s of each sheath pipe 17 arranged in ST4, and the mud-sending conduit 70 is inserted into each of the single pipes 9'through the bypass flow passages 70p and 70s.
By circulating the muddy water 20 at a pressure substantially equal to
As described above, the excavation work of the face 5a is continuously continued without stopping the pressurized supply of the muddy water 20. And, the shield device 2 is one of the single pipes 9 constituting the mud pipe 7A.
After advancing by the length L1 of the book, as described above, the frame 13 of the pipe extension device 10 is moved to the shield device 2 again.
Of the mud pipe 7A by extending a new single pipe 9'to the single pipe 9 through the rotating operation of the rotating body 14 and the projecting operation of the movable tube 12, and By adding the single pipe 9'to the mud pipe 7A, the inside 17
By repeating the operation of replenishing and loading a new single pipe 9 ′ into the sheath pipe 17 in which s is empty, the mud water 20 is continuously supplied under pressure without interruption, that is, the face 5a is stabilized. The mud pipe 7A can be extended without trouble while continuously excavating in this state. Therefore, the mud pipe 7A
It is not necessary to cut the mud-sending conduit 70 once to suspend the mud-sending for the purpose of extending the length of the pipe, and all the pipe-extending work is performed inside the pipe-extending device 10. By not cutting the mud-sending conduit 70, the labor required for the pipe extension work is saved, and since the mud water 20 does not overflow into the tunnel 5 in the pipe extension device 10, the labor required for cleaning is reduced. You can do it. Furthermore, the pressure in the new single pipe 9'added to the laid mud pipe 7A is
Prior to the pipe extension work, and during the pipe extension work,
Even when the rotating body 14 is rotating, the bypass flow path 7 continues.
Since the mud water 20 is maintained in a state of being pumped and flowed at a predetermined pressure in the same manner as the mud sending pipe 70 formed by the mud sending pipe 7A via 0s and 70p, at all times, that is, during pipe extension work. Also in this case, the supply pressure of the muddy water 20 to the shield device 2 side can be adjusted arbitrarily. Further, the excavation gap formed from the face 5a by the shield device 2 when constructing the tunnel 1 is the same as the mud pipe 7A described above by the mud pipe extension device that is exactly the same as the pipe extension device 10.
The sludge removal operation is carried out without delay to the mine mouth side through a sludge discharge pipe that can be extended promptly, so that the sludge discharge pipe extension work can be performed smoothly and at the time of tunnel excavation. The amount of sludge discharged can be adjusted at will. Therefore, using the tube extension device 10,
In response to sudden changes in the cutting face 5a, the cutting face 5a can always be held at a predetermined mud pressure in response to this suddenly, so that stable excavation work can be continued at any time to ensure safe and easy construction. You can build tunnel 1.

In the embodiment described above, the rotating body 14 has four sheath pipes 17 supported by the rotor flanges 18 and 19, and the respective axial centers of the sheath pipes 17 are the same circle. The example in which the sheath tube is configured to be rotatable at a pitch of 90 degrees has been described, but the number of the sheath tubes 17 and the rotation mode thereof are arbitrary. For example, the rotating body 14 has two sheath pipes selectively or alternately positioned between the muddy water pipe receiving mechanism such as the connecting cylinder 35 and the connecting pipe line mechanism such as the movable pipe 12 and the joint cylinder 15a. Alternatively, the rotating body 14 has a plurality of sheath tubes 17 which are more than four, and the sheath tubes 17 rotate in arbitrary orbits. It may be configured such that it can be selectively positioned between the muddy water pipe receiving mechanism and the connection pipe line mechanism. Further, in the embodiment, the sheath tube standby positions ST2, ST3, ST4
As the first and second valve bodies for opening and closing the front end and the rear end of the sheath pipe 17 positioned at the position, a plug 29 is provided at the front end side and an opening / closing cylinder 32 is provided at the rear end side. An example in which the cap plug 31 is detachably fitted by pulling out the cap plug 31 from the opening / closing cylinder 32 as a plug capable of communicating the inside 17s of the sheath tube 17 with the outside has been described. The first and second valve bodies such as the plug 29 and the opening / closing cylinder 32 selectively open and close the front end and the rear end of the sheath pipe 17, thereby allowing the sheath pipe 1 to be closed.
7 is not necessarily configured as described in the embodiment as long as it is configured to be able to isolate the inside 17s of 7 from the outside, and supports the first and second valve bodies. The mounting mode is arbitrary. Further, the cap plug 31 fitted as a plug into the opening / closing cylinder 32 is provided on only one of the plug 29 and the first and second valve bodies such as the opening / closing cylinder 32, or on both of them. However, the shape of the plug such as the cap plug 31 and the manner of attaching and detaching it to the valve body are arbitrary. Further, in the embodiment, the muddy water recovery mechanism 28 used as the discharge and injection means for selectively discharging and injecting the muddy water 20 in the inside 17s of the sheath pipe 17 has a plug 29, a valve cylinder such as the opening / closing cylinder 32, or the like. Alternatively, the muddy water 20 in the inside 17 s of the sheath pipe 17 is provided by being arranged in both of them.
If it can be discharged and injected, a configuration other than that described in the embodiment may be used.

[0039]

As described above, according to the present invention, the first rotating body supporting means such as the stator flange 16 and the second rotating body supporting means such as the stator flange 15 are provided in the predetermined direction in the tunnel building direction. The first rotary member support means is provided with a muddy water pipe receiving mechanism such as a connection cylinder 35 and an open end 9a of an existing muddy water pipe such as a mud transport pipe 7A can be received. The muddy water pipe is provided so as to be slidably supported along its axis, and is connected to a shield machine such as a shield device 2 at a position of the second rotating body supporting means facing the muddy water pipe receiving mechanism. A flexible connecting pipe line mechanism such as the joint cylinder 15a and the movable pipe 12 is provided, and between the first rotating body supporting means and the second rotating body supporting means,
A rotating body 14 having a plurality of sheath pipes 17 capable of accommodating the muddy water pipes such as single pipes 9 and 9'in their respective inner portions 17s is rotatably provided, and the sheath pipes 17 are connected to the muddy water pipe receiving mechanism and the connection pipeline The mechanism is provided between the mechanisms in a selectively positionable manner,
The plug mechanism 26, 2 capable of selectively loading the sheath pipe 17 with the muddy water pipe in the rotating body supporting means and the second rotating body supporting means.
7 and other loading means are provided, and the loading means has first and second valve elements such as a plug 29 and an opening / closing cylinder 32 that can open and close the front end and the rear end of the sheath tube 17, respectively.
And / or the second valve body is provided with a discharge / injection means such as a muddy water recovery mechanism 28 capable of discharging and injecting the muddy water 20 in the inside 17s of the sheath pipe 17, and the first and / or second valve body is capped. Since the plug such as the plug 31 is detachably provided so that the inside of the sheath pipe can be communicated with the outside through the valve body provided with the plug, the first and second valve bodies have a predetermined configuration. The inside 17s of the sheath tube 17 is isolated from the outside by selectively closing the front end and the rear end of the sheath tube 17 of the sheath pipe 17, and in this state, the discharge injection means is the sheath isolated from the outside. The muddy water 20 in the inside 17s of the pipe 17 can be discharged or injected. Therefore, when extending a mud pipe such as a mud pipe and a mud pipe for use in the mud shield method, the tip of an existing mud pipe is received through a mud pipe receiving mechanism so that the pipe extension device 10 or the like can be received. If the muddy water pipe extension device according to the present invention is installed, the muddy water 20 receives the muddy water pipe receiving mechanism and the connecting pipe line mechanism through the sheath pipe positioned between the muddy water pipe receiving mechanism and the connecting pipe line mechanism. It is sent and discharged in the form of distribution between the two. Then, when extending the existing mud pipe, if the mud pipe extension device is moved forward with respect to the existing mud pipe, the axial center of the existing mud pipe is supported by the mud pipe receiving mechanism. Since it slides along the pipe, a new mud pipe is added between the mud pipe receiving mechanism and the connecting pipe mechanism in the form of being arranged in front of the tip of the existing mud pipe. A space portion such as a void SP to be formed is formed. Therefore, in this state, by rotating the rotating body 14, by positioning the sheath pipe 17 in a state where the mud pipe is housed in the inside 17s, between the mud pipe receiving mechanism and the connection conduit mechanism,
A new mud pipe containing the positioned sheath pipe 17
It is possible to easily arrange the new mud pipe described above in the space portion to be replenished and add the new mud pipe to the tip of the existing mud pipe. At this time, in the new mud pipe to be added to the tip position of the existing mud pipe, before the mud pipe is positioned between the mud pipe receiving mechanism and the connecting pipe mechanism by the rotation of the rotating body, Sheath tube 1 containing
By closing the front end and the rear end of 7 via the first and second valve bodies, the inside 17s of the sheath tube 17 is isolated from the outside, and in this state, the inside thereof is discharged through the discharge injection means. 1
The muddy water 20 can be injected into 7s at an arbitrary pressure. Therefore, the new mud pipe that is added to the tip of the existing mud pipe may be added to the existing mud pipe in a state where the pressure of the mud pressure equal to the mud pressure in the existing mud pipe is pre-injected and filled inside. Since it is possible, there is no concern that the mud pressure will drop until the pressure mud is filled in the new mud pipe that has been added to the existing mud pipe as in the past, that is, according to the present invention, it has already been installed. It is possible to continuously adjust the mud pressure to an arbitrary value during this period without waiting for the new mud pipe connected to the mud pipe to be filled with the pressure mud. The operation of injecting and filling the pressurized mud into the new mud pipe in this way isolates the inside 17s of the sheath pipe 17 accommodating the new mud pipe from the outside through the first and second valve bodies. Since it can be performed in a state where the muddy water is filled, the muddy water is continuously circulated through the sheath pipe 17 positioned between the muddy water pipe receiving mechanism and the connection conduit mechanism. It can be carried out in parallel with the circulation of the muddy water during the operation. Therefore, for example, when it is necessary to pressurize the mud water promptly due to fluctuations in the face of the mud pipe, or when it is desired to immediately adjust the amount of mud in the mud pipe, the mud pipe can be used at any time at any time. Since the mud pressure can be adjusted immediately after adding a new mud pipe, it is possible to respond quickly to changes in the cutting face, and therefore the risk of collapsing the cutting face by causing sludge during the mud pipe extension work. There is no. Also,
In this way, by adding a new mud pipe to the existing mud pipe, the inside 17s of which is emptied, the sheath pipe 17 must be sequentially replenished with new mud pipes from the outside of the mud pipe extension device. At this time, the sheath pipe 17 is in a state of being filled with the pressure muddy water circulating in the inside 17s thereof when it is positioned between the muddy water pipe receiving mechanism and the connection conduit mechanism. Therefore, when a new muddy water pipe is replenished and loaded into the sheath pipe 17 whose inside 17s is filled with pressure muddy water, the inner 17
When s is isolated from the outside, if the pressure muddy water filled in the inside 17s thereof is removed via the discharge / injection means, the muddy water overflows from the inside 17s of the sheath pipe 17 into the tunnel, and It is possible to easily treat the muddy water without wasting the muddy water as much as the amount of the muddy water and the trouble of treating the overflowing muddy water. In this state, if the plug is detached from the first and / or second valve body, the empty sheath tube 17
It is possible to easily replenish and load a new mud pipe into the interior 17s of the. The refilling work of the muddy water pipe into the sheath pipe 17 thus performed can be performed in a state where the inside 17s of the sheath pipe 17 is isolated from the outside through the first and second valve bodies. During the replenishment and loading operation of the new muddy water pipe, the muddy water is continuously circulated between the muddy water pipe receiving mechanism and the connection conduit mechanism as described above. The pressure muddy water discharged from the inside 17s of the sheath pipe 17 by the discharge injection means is temporarily stored, and the sheath pipe 17 is replenished with a new muddy water pipe as described above, and then again. If the stored mud water is returned to the inside 17s of the sheath pipe 17, that is, the mud pipe loaded and accommodated therein through the discharge injection means, as described above, the existing mud pipe is put into the mud pipe. Since no new mud is required to fill the mud with a pressure equal to the mud pressure in the water pipe, it is economical because the leakage waste of the mud can be omitted. Therefore, according to the present invention, it is possible to perform a smooth excavation work while maintaining the stability of the cutting face at all times with good workability while extending the mud pipe without trouble.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a tunnel being constructed by a muddy water shield method.

FIG. 2 is a sectional side view showing an embodiment of a mud pipe extension device according to the present invention.

FIG. 3 is a sectional view taken along line III and III of the muddy water pipe extension device shown in FIG.

FIG. 4 is an exploded perspective view of a rotor flange and a stator flange in the muddy water pipe extension device shown in FIG.

5 is a partially enlarged view showing a plug closed state in the muddy water pipe extension device shown in FIG. 2. FIG.

6 is a partially enlarged view showing a plug opening state in the muddy water pipe extension device shown in FIG.

FIG. 7 is an enlarged view showing a connection portion between a laid mud pipe and a new mud pipe connected to the laid mud pipe in the mud pipe extension device shown in FIG.

FIG. 8 is a cross-sectional side view showing a connection state of the laid mud pipe shown in FIG. 7 and a new mud pipe connected to the laid mud pipe.

9 is a cross-sectional side view showing a method for extending a muddy water pipe in the muddy water pipe extending device shown in FIG.

10 is a cross-sectional side view showing a method for extending a muddy water pipe in the muddy water pipe extending device shown in FIG.

11 is a cross-sectional side view showing a method for extending a mud pipe in the mud pipe extension device shown in FIG.

[Explanation of symbols]

 2 ... Shielding machine (shielding device) 7A ... Existing muddy water pipe (muddy water pipe) 9, 9 '... Muddy water pipe (single pipe) 9a ... Tip (open end) 10 ... Muddy water pipe extension device (pipe) Extension device) 12 ... Connection conduit mechanism (movable pipe) 15a ... Connection conduit mechanism (joint cylinder) 15 ... Second rotor support means (stator flange) 16 ... First rotor support means ( Stator flange) 17 ... Sheath pipe 17s ... Inside 26, 27 ... Loading means (plug mechanism) 28 ... Discharge injection means (muddy water recovery mechanism) 29 ... Valve element (plug) 31 ... Plug (cap plug) 32 ... Valve body (open / close cylinder) 35 ... Muddy water pipe receiving mechanism (connection cylinder)

Claims (1)

[Claims] 1. A first rotating body supporting means and a second rotating body supporting means are provided at a predetermined interval in a front and rear direction of a tunnel building direction, and the first rotating body supporting means has a muddy water pipe receiving mechanism. Is provided so that the tip of the existing muddy water pipe can be received and the slidable water pipe can be slidably supported along its axis, and faces the muddy water pipe receiving mechanism of the second rotating body supporting means. A connecting pipe line mechanism connectable to the shield machine is provided at a predetermined position, and a muddy water pipe can be housed inside each of the first rotating body supporting means and the second rotating body supporting means. A plurality of rotating bodies are rotatably provided, and the sheath pipe is selectively positioned between the muddy water pipe receiving mechanism and the connecting pipeline mechanism, and the first rotating body supporting means and the second rotating body supporting means are provided. In the rotating body support means of
The sheath pipe is provided with a loading device capable of selectively loading a muddy water pipe, and the loading device has first and second valve bodies capable of opening and closing a front end and a rear end of the sheath pipe, respectively. The first and / or second valve body is provided with a discharge and injection means capable of discharging and injecting muddy water inside the sheath pipe, and the first and / or second valve body is provided with a plug and the plug is provided. A muddy water pipe extension device, which is detachably provided so that the inside of the sheath pipe can communicate with the outside through a valve body.