JPH06272476A - Mud pipe - Google Patents

Abstract

PURPOSE:To prevent mud from leaking from the inside of a mud pipe extending device. CONSTITUTION:A pipe extending device 10 is provided with a connecting cylinder 35 allowing a feed mud pipeline 70, formed of a feed mud pipe 7A constituted of plural mud pipes connected in series, to be disposed in the inside 35s. A pipe 8, provided with annular seal 93 along the outer periphery of a single pipe 9, as one mud pipe is slided along the axial direction of the connecting cylinder 35 so as to feed/discharge mud while being extended, thus constructing a tunnel. At this time, mud can be fed/discharged in the state of sealing a space to the connecting cylinder 35 by the seal 93 provided at the single pipe 9 itself of the pipe 8, and in this state, the pipe extending device 10 is advanced to enable the extension of the mud pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mud pipe which can be extended in a mud pipe extension facility used for sending mud, sludge and the like when excavating and constructing a tunnel by a mud shield method.

[0002]

2. Description of the Related Art Conventionally, in the shield construction by the mud shield method, along with the shield excavation, it is necessary to successively extend the mud pipe for sending mud and discharging mud for holding the face and carrying out the excavated earth and sand. . Therefore, in order to perform such work for extending the mud pipe for mud sending and discharging without stopping the mud sending and discharging, for example, as shown in JP-A-63-293298, the tip of the installed pipe is extended. A form in which the pipe is extended to the inside of the device and connected to it, and when the cutting face advances by one pipe length, the pipe extension device is advanced in accordance with this, and the pipe is positioned in front of the laid pipe. A muddy water pipe extension device has been proposed in which a pipe for extension is loaded in and the additional pipe is added.

[0003]

However, the inside of such a pipe extension device is in the form of a pressure chamber filled with the pressure muddy water discharged from the installed muddy water pipe opened here. In the muddy water pipe inlet part of the shape which receives the head part of the muddy water pipe laid inside the device,
If the space between the muddy water pipe inlet and the muddy water pipe is not sufficiently sealed, the pressure muddy water will leak to the outside of the device. However, in a pipe extension device, the extension work of the mud pipe cannot be performed unless the pipe extension device moves forward with respect to the installed mud pipe. Such a muddy water pipe receiving port that has received the existing muddy water pipe and the installed muddy water pipe must be formed so that they can slide relative to each other, and therefore, the muddy water pipe receiving port is installed at the muddy water pipe inlet. It is not possible to make a fixed seal between the existing muddy water pipe. For this reason, the pressure muddy water filled in the pipe extension device inevitably concentrates in such a muddy water pipe inlet and leaks out of the device from here, so that the muddy water pipe inlet has already been installed. It was quite difficult to seal this and prevent leakage of the pressure muddy water without impairing the slidability with the muddy water pipe. Therefore, the present invention, in view of the above circumstances, without impairing the slidability of the muddy water pipe inlet portion with respect to the installed muddy water pipe,
An object of the present invention is to provide a muddy water pipe capable of effectively preventing leakage of the pressure muddy water filled inside the muddy water pipe extension device.

[0004]

That is, the present invention has a muddy water pipe receiving mechanism (35) in which a muddy water flow passage (70) is arranged (35s), and the muddy water pipe receiving mechanism (35) is provided in the muddy water pipe receiving mechanism (35). On the other hand, in a muddy water pipe extension facility (7) for extending the muddy water pipe (8) by sliding the muddy water pipe (8) relative to its axial center direction, the muddy water pipe (8) is arranged in a series direction. A seal body (9) having a plurality of connectable pipe bodies (9) and capable of sealing the pipe body (9) with the muddy water pipe receiving mechanism (35).
3) is provided in an annular shape along the outer circumference of the tubular body (9). The numbers in parentheses () indicate the corresponding elements in the drawings for convenience, and therefore the present description is not limited to the description in the drawings. The same applies to the following action columns.

[0005]

With the above-mentioned structure, the present invention provides a muddy water pipe (8).
Is relatively slid with respect to the muddy water pipe receiving mechanism (35) in a state where the pipe body (9) and the muddy water pipe receiving mechanism (35) are sealed via a seal body (93). Act as you do.

[0006]

EXAMPLE 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 example of a muddy water pipe extension device used for constructing the tunnel shown in FIG. 1, and FIG. 2 is a cross-sectional view taken along the line III, III in the muddy water pipe extending device shown in FIG. 2, FIG. 4 is an enlarged view showing a connecting conduit mechanism portion located in the front part of the muddy water pipe extending device shown in FIG. 2, and FIG. 5 is shown in FIG. An enlarged view showing the opening end of the muddy water pipe received by the muddy water pipe extension device and a connection part of a new muddy water pipe to be added to this.
FIG. 6 is a view showing a connection state of the laid mud pipe shown in FIG. 5 and a new mud pipe connected to the mud pipe, and FIG. 7 is FIG. 5 or FIG.
2 is a cutaway perspective view showing the mud pipe shown in FIG.
FIG. 8 is a sectional side view showing a method of extending the muddy water pipe by using the muddy water pipe shown in FIG. 7 by the muddy water pipe extension device shown in FIG.

As shown in FIG. 1, the tunnel 1 being constructed by the muddy water shield construction method has a tunnel 5 formed by excavation in a ground 3 which is a soft ground by a shield device 2 whose cutting blade is formed in a disk shape. Since the tunnel 5 is still under excavation from the arrow B direction side in FIG. 1 toward the arrow A direction side, the cutting face 5a shown at the left end in FIG. 1 advances in the arrow A direction as the excavation tip. It is formed in a roll-over column shape of a shape to be obtained, and is lined and supported by a segment or the like. At 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 carriage (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 face 5a advances.
In FIG. 1, 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 as a muddy water pipe extension facility whose length in the directions of arrows A and B can be extended as the face 5a is dug. To the muddy water equipment 7, muddy water 20 is pressure-fed in the direction of arrow A in FIG.
The muddy water pipe 70 which is a muddy water flow path formed in the mud pipe 7A in the form of sending 0, and the muddy water 20 fed to the face 5a.
1 is discharged from the lower part of the shield device 2 shown in FIG. 1 to remove gravel, and then it is pumped in the direction of arrow B in FIG. 1 and discharged to the side of the well 5c in the right part of FIG. Two muddy water pipelines are provided in which the flowing directions of the muddy water 20 are opposite to those of the pipelines. In addition, the mud pipe 7A in the muddy water facility 7
The drainage pipe (not shown) simply has a configuration in which the circulation directions of the muddy water 20 are opposite to each other, and both are configured in substantially the same manner.
In the embodiments described below, the mud pipe 7A, the mud pipe 70 formed by the mud pipe 7 and the pipe extension device 10 as a mud pipe extension device for extending the mud pipe 7A are described, and the mud pipe and the pipe are formed. The detailed description and illustration of the sludge discharge line are omitted. The construction of the mud pipe extension device for extending the mud pipe and the direction in which it is installed in the tunnel 5 are substantially the same as those of the pipe extension device 10 described below.
The distribution direction of 0 is in the opposite direction.

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 pipe 7A is a pipe 8 formed to have a predetermined length L1 (for example, L1 = 5.0 to 6.0 m in the embodiment) in the directions A and B in FIG. The pipe 8 is made up of a plurality of pipes 8 which are muddy water pipes, and each pipe 8 is a pipe body having an outer diameter of a predetermined pipe outer diameter D1 as shown in FIG. A plurality of single pipes 9 that can be connected in the serial direction are provided. Inside each of the single pipes 9, there is a horizontal columnar space, and the mud sending pipe 70 can be formed as a mud flow passage by circulating the mud water 20 for mud sending in the space, that is, in the space. Each of the pipes 8 is formed by arranging a part of the mud feeding pipe 70. Therefore, each pipe 8 is a single pipe 9 which is a tubular body, and the mud feeding pipe is formed inside the single pipe 9. It is configured by a cylindrical space which is a part of the conduit 70 (that is, the mud-sending conduit 70 for a predetermined length L1). Therefore, in the mud-sending conduit 70, which is the flow path for the muddy water 20, the single pipe 9 forming the tubular body portion of the pipe 8 is arranged in the series direction which is the arrow A, B direction side of the single pipe 9 in FIG. Each single tube 9 is connected to the other adjacent single tube 9, 9, respectively.
The space portions formed in a columnar shape communicate with each other in the directions of the arrows A and B, and are thereby formed so as to be continuous in the directions of the arrows A and B. The plurality of pipes 8 arranged on the rear side of the pipe extension device 10 have already been laid by the single pipe 9 being temporarily fixed in a form such that the single pipe 9 cannot move to the invert 5b or the like. As shown in FIG. 2, in the pipe 8 which is the muddy water pipe at the foremost position of the pipe 8, the opening end 9a which is the tip of the mud feeding pipe 7A has an extension pipe 8'through the opening end 9a. Are added to each other, whereby the mud transport pipe 7A is opened in the pipe extension device 10 in such a manner that it can be extended in the directions of arrows A and B. (Note that the pipe 8 constituting the mud transport pipe 7A and the extension pipe 8'which is newly added thereto are the same members, but in the embodiment, these pipes 8 are provided for convenience of explanation. ,
Different numbers will be attached to 8'to distinguish them. On the other hand, on the front side of the pipe extension device 10 shown in the arrow A direction in FIG. 1, a flexible pipe 11 made of a flexible resin pipe or the like connects the pipe extension device 10 and the shield device 2 to each other. As a discharge port of the device 10, the discharge port 12a shown on the arrow A direction side of the movable pipe 12, which is a tube body through which the muddy water 20 can flow, is connected and mounted via a joint 12b.

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, each of which is formed in a disk shape as a whole, are provided on 13 at predetermined intervals in the directions A and B, which are the front and rear directions of the tunnel building direction. As shown in the lower right part of FIG. 2, the stator flange 16 is provided with a connection cylinder 35, which is a mud pipe receiving mechanism and will be described in detail later, and is movable in the directions A and B by a predetermined stroke L2. The connecting cylinder 35 has an internal space 35 formed inside thereof.
In the form in which the mud sending channel 70 which is the mud flow path is arranged in s, the open end 9a which is the front end of the pipe 8 which constitutes the leading portion of the mud sending tube 7A which is the existing mud pipe can be received. In addition, the mud pipe 7A is provided so as to be slidably supported along the axis thereof. Therefore, the muddy water equipment 7 uses the pipe extension device 10 to connect the pipe 8 which is the muddy water pipe constituting the mud feeding pipe 7A to the connecting cylinder 35.
By sliding relative to the axial direction of
It is configured so that it can be extended. On the other hand, on the stator flange 15, as shown in the lower left part of FIG. 2, the discharge port 12a of the pipe extension device 10 is formed at a position facing the connecting cylinder 35 provided on the stator flange 16 side as described above. The connecting line mechanism 120 having the movable pipe 12 for
The mud-sending conduit 70 is provided so as to be freely connectable to the shield device 2 via the, so that the inside 12s of the movable pipe 12 constitutes a mud-water sending space formed in the connection conduit mechanism 120. It has a shape.

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
The respective material axes are directed in the directions of the arrows A and B, which are the tunnel axis directions, and one pipe 8 is provided inside each of them, that is, a laid mud pipe 7A, as shown in FIG. It has a plurality of, in the example, four sheath pipes 17 in which new pipes 8 ′ for replenishment to be replenished can be accommodated. As shown in FIG. 5, each of the sheath tubes 17 has an inner diameter that is substantially the same as the inner diameter of the connecting cylinder 35.
The outer diameter D1 of the single pipe 9 accommodated in the inside 17s is larger than the outer diameter D1. Further, as shown in FIG. 3, four positions of standby positions ST1, ST2, ST3, ST4 of the sheath tube are set in the rotating body 14 so that their respective axial centers are arranged on the same circumference. The four sheath tubes 17 are rotated by the rotating body 14 so that the respective sheath tube standby positions ST1, ST2, ST3, ST
4 can be moved and positioned. Four sheath tube standby positions ST1, ST2, ST3, ST
2, the sheath pipe standby position ST1 shown on the lower side of FIG. 2 or the lowermost portion of FIG. 3 is, as shown in FIG. 2, the muddy water pipe receiving mechanism formed by the connection cylinder 35, and the connection conduit mechanism 12
0, so that each sheath pipe 17 of the rotating body 14 can be selectively positioned between the mud pipe receiving mechanism by the connecting cylinder 35 and the connecting pipe line mechanism 120. Has become.

As shown in FIG. 2, each sheath pipe 17 of the rotating body 14 has a length slightly smaller than the length L1 of the pipe 8 which is one mud pipe constituting the mud pipe 7A. Make up,
Each of the sheath pipes 17 is made of a steel pipe or the like having an inner diameter slightly larger than the outer diameter D1 of the pipe 8.
The flanges 17 projectingly formed at both ends in the arrow A and B directions
Each of the front and rear surfaces of a and 17a is fixedly mounted on a pair of rotor flanges 18 and 19 which are formed in a disk shape as a whole and are arranged at predetermined intervals in the directions of arrows A and B, respectively. Has become. The rotor flanges 18 and 19 are respectively provided with holes 18s and 19s for attaching the sheath tube,
The same number as the number of the sheath pipes 17 provided in the above, that is, four in the embodiment, are formed so as to penetrate in the directions of the arrows A and B, respectively.
The four sheath tubes 17 are supported in such a manner that 9s communicates with the inside 17s of each sheath tube 17, and in this state, the stator flanges 15 and 16 are rotatably fitted. Further, in the rotating body 14, a main shaft 21 which is a drive shaft of the rotating body 14 is provided with the four sheath tube standby positions ST1, ST2, ST3, ST4.
It is suspended and supported between the rotor flanges 18 and 19 so as to be located at the center of the main shaft 21. The main shaft 21 is provided so that the four sheath pipes 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.
Is connected to the main shaft 21 through a drive gear 22 in such a manner that the main shaft 21 can be rotated and rotated by 90 degrees.
Is a disc-like shape formed by fitting and connecting four sheath pipes 17, and a supporting portion 251 shown in the lower part of FIG. 1 is fitted and supported by a support ring 25 fixedly supported by the frame 13. When the main shaft 21 rotates through the hydraulic motor 23 about the shaft center CT0 by 90 degrees in the directions of the arrows M and N, the four sheath pipes 17 are moved to the respective sheath pipe standby positions ST1 and ST.
2, ST3, ST4 can be moved and positioned relative to each other, that is, the sheath pipe 17 can be selectively positioned between the muddy water pipe receiving mechanism formed by the connection cylinder 35 and the connection pipe passage mechanism 120. It has a shape. A support pipe 132 is suspended and fixed between the stator flanges 15 and 16 via means such as bolting above the four sheath tubes 17 of the rotary body 14 in FIG. So that the main shaft 21 is the rotor flange 1 of the rotor 14.
By rotating 8 and 19 at 90 degree pitch,
The four sheath pipes 17 that are moved and positioned between the respective sheath pipe standby positions ST1, ST2, ST3, and ST4 include the frame 13
Between the support pipe 132 and the support pipe 132, the material shaft center of each sheath pipe 17 is rotated by 90 degrees in a circular shape with the shaft center CT0 of the main shaft 21 as the rotation center.

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 arranged 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 pipes 8'are respectively housed therein are in the standby preparation position for moving sequentially to the sheath pipe standby position ST1 through the rotation of the main shaft 21. . 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 pipe standby positions ST2, ST3, and ST4, and the stator flange 15 on the front side has a 3 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 tube extension device 10, each sheath tube 1 located at each of the sheath tube standby positions ST2, ST3, ST4
A pair of plug mechanisms 26 and 27 which can open and close the inside 17s of the 7 at both ends in the directions of arrows A and B, respectively.
However, the plug retreat hole 15s and the cylinder mounting hole 16s are each openable and closable, and three plug holes are provided in the embodiment, and the plug mechanisms 26 and 27 are provided as mud pipes 7A which are existing mud pipes. The pipe 8 ′, which is a new mud pipe to be added to the above, is configured to form a loading means capable of selectively loading each sheath pipe 17 of the rotating body 14. On the other hand, the sheath pipe 17 arranged at the sheath pipe standby position ST1 has a shape in which the inside 17s thereof opens toward the movable pipe 12 and the connection cylinder 35 through both ends of the sheath pipe 17 in the directions of arrows A and B. And the sheath pipe 17 positioned at the sheath pipe standby position ST1
In the inside 17s of the connection pipe 35, the mud main stream directly connected to the movable pipe 12 of the connection line mechanism 120 in a shielded connection can flow into the inside 17s of the sheath pipe 17 and the mud feeding line. A part of 70 is always arranged.

The front and rear portions of the pipe extension device 10 are
As shown in FIG. 2, the muddy water circulation spaces 70 s and 70 p are provided 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 of the rotating body 14. The muddy water circulation spaces 70s and 70p are formed so as to be arranged in the space formed between the flanges 19, respectively, and the sheath pipes 17 positioned at the sheath pipe standby positions ST1, ST2, ST3, and ST4 communicate with each other. Possible shape, namely mud transport line 70
The muddy water 20 flowing through the inside of each sheath pipe 17 or its inside 17
It is configured so that it can selectively flow into the inside of the single pipe 9 forming the pipe 8 housed in s. Therefore, the plug mechanisms 26 and 27 provided on the stator flanges 15 and 16 as loading means for opening and closing the front and rear of the respective sheath pipes 17 located at the sheath pipe standby positions ST2, ST3, and ST4 are Pipe standby position ST2, ST3, S
The inside 17s of each sheath pipe 17 located at each T4 is communicated with or separable from the muddy water circulation spaces 70p and 70s.

That is, the sheath tube standby positions ST2, ST3, ST
2 or 4, each of the plug mechanisms 26 provided on the front side of the valve 4 has a valve body of a type capable of opening and closing a hole 18s which is in communication with the sheath pipe 17 in the rotor flange 18. The plug 29 is the plug mechanism 2
A plug opening / closing cylinder 30 provided on the arrow A direction side of 6
The plug 29 is provided with a plug 29 for each plug mechanism 26 in such a manner that it can be driven to project and retract by a stroke length L2 of the opening / closing cylinder 30 in the directions of arrows A and B, which are the axial directions of the tunnel. Arrow A through 30,
By the operation of projecting and retracting in the B direction, each sheath tube standby position S
Each sheath tube 17 located in each of T2, ST3, ST4
The interior 17s of each is configured so that it can be isolated from or communicated with the muddy water circulation space 70s. 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.

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 of FIG. 2, a tank 281 capable of storing a predetermined volume of muddy water 20 is connected to each of the overflow ports 291 and the water supply / drainage port 292 via a pressure hose or the like, and the muddy water is recovered. The mechanism 28 is in a state in which 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 4. Also in the above, the overflow port 291 and the water supply / drainage port 2
The muddy water 20 in the inside 17s of the sheath tube 17 can be freely discharged into the tank 281 via 92 or can be injected and filled into the inside 17s of the sheath tube 17 from here again at a predetermined pressure.

On the other hand, the muddy water distribution space 70p provided between the rotating body 14 and the rear stator flange 16 at the rear portion of the pipe extension device 10 is a connection which constitutes the above-mentioned muddy water pipe receiving mechanism. The cylinder 35 retracts in the direction of the arrow B with respect to the rotor flange 19, that is, the rotating body 14, so that the inside of the connecting cylinder 35, that is, the mud-sending conduit 70 and the sheath pipe arranged in the connecting cylinder 35 through the mud circulation space 70p. The plug mechanism 27 is configured to be able to communicate with the inside 17s of the sheath pipe 17 and provided so as to open and close the rear side of each sheath pipe 17 arranged at the sheath pipe standby positions ST2, ST3, ST4. As will be described later, the loading port 33 is formed in the sheath pipe 17 toward the gallery 5, and the sheath pipe 17 is opened from here.
At the same time as configuring a loading means for selectively loading a new mud pipe 8'into the inside 17s of the sheath pipe 17 of the sheath pipe standby positions ST2, ST3, ST4. It serves as plug means for opening and closing the interior 17s with respect to the muddy water circulation space 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 which can open and close the rear side of the sheath pipe 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.
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 muddy water circulation space 70p, or the tunnel 5 which is the outside, or is shielded. Is configured to get.

The mounting region of the cap plug 31 inside the opening / closing cylinder 32, which is fitted into the cylinder mounting hole 16s of the stator flange 16, has the sheath tube standby positions ST2, S.
There is a loading port 33 for loading a new pipe 8'on each sheath pipe 17 arranged at T3 and ST4. Therefore, the cap plug 31 serves as an opening / closing plug of the loading port 33.
That is, the plug 17 is configured to open and close the loading port 33 for communicating or isolating the inside 17s of the sheath tube 17 with the outside. Further, at the end of the opening / closing cylinder 32 on the arrow A direction side, a seal rubber 321 equivalent to the seal rubber 293 mounted on the protruding tip side of the plug 29 is provided along the protruding side tip edge of the opening / closing cylinder 32. Is fitted and mounted in an annular shape, and the opening / closing cylinder 32 is
By this movement in the directions of arrows A and B, the seal rubber 321 is connected to the bottom 19a side of the rotor flange 19 so as to surround the hole 19s of the rotor flange 19 or to the outer peripheral portion of the opening / closing cylinder 32 mounting area of the stator flange 16. The open / close cylinder 32 is connectable and separable from the sheath tube 17 positioned at the sheath tube standby positions ST2, ST3, ST4 in the rotating body 14.

Further, in the pipe extension device 10, the connection conduit mechanism 120 connected to the shield device 2 via the flexible pipe 11 is arranged in the front side of the sheath pipe standby position ST1 as described above. As shown in FIG. 4, it is a tubular body formed in a straight shape having an outer diameter corresponding to the inner diameter of the sheath pipe 17, and the inside 12s thereof is a mud water supply space in which mud water 20 can flow. Has a pipe 12,
As shown in FIG. 4, the movable pipe 12 is fixed to the frame 13 together with the stator flange 15 in such a manner that the movable pipe 12 can project and retreat in the directions of arrows A and B by a predetermined stroke L3 with respect to the front stator flange 15. It is fitted and attached to the joint cylinder 15a. Movable pipe 12
Is slidable in the cylinder mounting hole 15p of the stator flange 15 in the directions of arrows A and B by the stroke of the stroke L3 by driving the joint cylinder 15a, that is, in the region between the connecting cylinder 35 and the connecting conduit mechanism 120. The movable pipe 12 is provided so as to project toward the sheath pipe 17 positioned at a certain sheath pipe standby position ST1. When the movable pipe 12 is in the most protruding state toward the arrow B direction side, the sheath pipe standby position A new pipe 8'for replenishment accommodated in the sheath tube 17 positioned in ST1 is
The pipe extension device 10 is configured so that it can be pushed and moved toward the arrow B direction side, which is the rear side. Therefore, the movable pipe 12 is driven by the protrusion so that the sheath pipe standby position ST
The sheath pipe 17 positioned at No. 1 is configured so as to be connectable to the mud pipe 7A whose frontmost portion is received by the pipe extension device 10 by the connection cylinder 35, and the movable pipe 12 is Through the projecting movement operation, the rotor flange 18 is allowed to enter or retract toward the bottom portion 18a of the rotor flange 18 so as to enter or retract into the muddy water circulation space 70s.

On the right side of FIG. 4 of the movable pipe 12, a plug cylinder 121, which is formed in a tubular shape so as to slidably support the movable pipe 12, corresponds to the stroke length of the plug 29 and the opening / closing cylinder 32. By the stroke L2, the stator flange 15 is protruded and retracted in the directions of arrows A and B, and is moved to a position corresponding to the front side of the sheath pipe standby position ST1 set in the rotating body 14 in the stator flange 15. The plug cylinder 12 is fitted and disposed in the cylinder mounting hole 15p that is formed through the plug cylinder 12.
4, a seal rubber 122 equivalent to the seal rubbers 293 and 321 attached to the projecting tip side of each of the plug 29 and the opening / closing cylinder 32 is attached to the plug cylinder 121 at the end in the direction of the arrow B in FIG. Is fitted and mounted in an annular shape along the tip edge of the plug cylinder 121.
The seal rubber 122 provided at the projecting tip of the rotor flange 15 moves to the rotor flange on the sheath pipe 17 positioned at the sheath pipe standby position ST1 through the operation of the projecting and retracting movement with respect to the stator flange 15 in the arrow A and B directions. The plug cylinder 1 is connected via 18 or is connected to the inner peripheral surface of the cylinder mounting hole 15p of the stator flange 15.
21 is connectable to and separable from the rotating body 14.
Therefore, the seal rubber 122 is moved to the sheath tube standby position ST by the projecting operation of the plug cylinder 121 to which the seal rubber 122 is attached.
The inside 17s of the sheath pipe 17 positioned at 1 and the inside 12s of the movable pipe 12 forming the mud-sending space in the connection pipe line mechanism 120 as described above are connected in a shieldable manner. It is configured to form a rotating body connecting means in the pipe line mechanism 120, and the inside 12s of the movable pipe 12 is
And the inside 17s of the sheath pipe 17 positioned at the sheath pipe standby position ST1 are shielded and connected to each other so that the mud-sending conduit 70 can be directly formed therein. In addition, in the mud-sending conduit 70 formed and arranged by the sheath pipe 17 and the movable pipe 12 positioned at the sheath pipe standby position ST1 in the projecting state of the plug cylinder 121, the seal rubber 122 has the seal rubber 122 inside the sheath pipe 17s. And the inside 12s of the movable pipe 12 are shielded and connected, the watertight communication is maintained so as to prevent leakage from the connecting portion of the sheath pipe 17 and the movable pipe 12 to the outside thereof, while the plug cylinder In the retracted state of 121,
A shape in which the muddy water conduit 70 communicates with a muddy water distribution space 70s formed between the stator flange 15 and the rotor flange 18, that is, a shape in which muddy water 20 can freely flow in both the muddy water conduit 70 and the muddy water distribution space 70s. It has become.

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,
As shown in FIG. 2, the connection cylinder 35, which constitutes the muddy water pipe receiving means for receiving the pipe 8 at the foremost position of the installed muddy water pipe 7A, into the pipe extending device 10, as shown in FIG. And plug cylinder 121
Is formed in a stepped cylindrical shape in such a manner that the stroke length L2 corresponding to the stroke length L2 of FIG.
The connecting cylinder 35 can freely move in and out of the muddy water circulation space 70p formed between the stator flange 16 and the rotor flange 19 as described above, through the operation of the connecting cylinder 35 protruding and retracting in the directions of arrows A and B. Is configured. In the vicinity of the rear end portion of the connection cylinder 35, a seal is provided between the outer periphery of the pipe 8 received in the pipe extension device 10 and inserted through the connection cylinder 35.
A plurality of pipe seals 36 each formed of an annular flexible material are provided side by side in the directions of arrows A and B, while the protruding end of the connecting cylinder 35 is located at the side of the arrow A direction. , A seal rubber 35 equivalent to the seal rubber 122 attached to the protruding tip of the plug cylinder 121.
1 is mounted in an annular shape along the front edge of the connecting cylinder 35. The connecting cylinder 35 has an arrow A,
By the operation of projecting and retracting in the B direction, the seal rubber 3
51 is the sheath tube standby position ST1 via the rotor flange 19
Selectively to the sheath pipe 17 positioned at the sheath pipe standby position ST1 in the rotating body 14 by being connected to the sheath pipe 17 located at or in the inner peripheral surface of the connecting cylinder 35 penetrating portion of the stator flange 16. Is configured to be connectable and separable, and thus the seal rubber 351 is
By the protruding operation of the connecting cylinder 35 to which this is attached, the connecting cylinder 35 is configured such that the inside 17s of the sheath pipe 17 positioned at the sheath pipe standby position ST1 and the inside 35s of the connecting cylinder 35 can be shielded and connected. The rotating body connecting means in the muddy water pipe receiving mechanism is configured. Therefore, when the connecting cylinder 35 is in a state of being connected to the rotating body 14 side via the rubber rubber 351 attached to the connecting cylinder 35, the connecting pipe 35 receives the mud feeding pipe line 70 formed by the mud feeding pipe 7A, Stator flange 16,
Muddy water distribution space 70p formed between the rotor flanges 19
Alternatively, it can be shielded from the outside of the tube extension device 10.

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 pipe 8 inserted into the inside 35s of the connection cylinder 35 is provided so as to be able to grip the outer peripheral portion thereof, and the pipe extension device 10 includes rotors on the front and rear sides of the four sheath pipes 17. Flanges 18, 19 and stator flange 15,
A cleaning mechanism 39 capable of cleaning the muddy water circulation spaces 70s and 70p formed between the pipes 16 and the interior 17s of the sheath pipe 17 that can communicate with these spaces is provided at the upper part of the water absorption port 391 in FIG. Water is supplied to the muddy water circulation spaces 70s and 70p respectively, and the muddy water circulation spaces 70s and 70p are provided so as to be freely drained from the respective drainage ports 392 provided in the lower portion of FIG. In addition, muddy water distribution space 70s, 70
p is the plug cylinder 121 of the connection conduit mechanism 120.
And the connecting cylinder 35 can be selectively communicated with the mud-sending conduit 70 through the projecting / retracting movement of the connecting cylinder 35 in the directions of arrows A and B. , The inside 35s of the connecting pipe 35 and the sheath pipe standby position S
Inside 17s of T1 sheath tube 17 and inside 12s of movable tube 12
Are sealed and connected by seal rubbers 122 and 351 respectively, so that the mud sending conduit 70 is shielded from the mud sending conduit 70 and the mud sending conduit 70 is isolated from the mud water circulating spaces 70s and 70p. Is configured.

The seal rubbers 122, 293, 321, 351 are provided between the respective members constituting the pipe extension device 10.
Besides, a suitable seal packing is used for the rotor flange 1
8, 19 and the rotating operation of the rotating body 14 constituted by the four sheath tubes 17 fixed thereto, and the respective plug mechanisms 26,
27, the projecting / retracting movement operation of the connecting pipe line mechanism 120 and the connecting cylinder 35, and further the frame 1 of the pipe extending device 10.
3 are provided everywhere in a manner that does not hinder the traveling movement operation of No. 3, so that the mud sending pipe 70 of the mud equipment 7 constitutes a plurality of connected pipes 8 that constitute the already installed mud sending pipe 7A. As shown in FIG. 2, the connection cylinder 35 is gripped by the grip portion 37a of the hydraulic clamp 37 from the internal space of the connection cylinder 35.
The pipe 8 inserted through the pipe 8 and the pipe 8 at the foremost position arranged in the inside 17s of the sheath pipe 17 positioned at the sheath pipe standby position ST1 in a form connected to the pipe 8 or the pipe 8 connected from here. A new pipe 8'or the inside 1 of the sheath pipe 17 itself located at the sheath pipe standby position ST1.
It is discharged into the pipe extension device 10 through 7s and selectively communicates with the muddy water circulation spaces 70p and 70s.
2s of the movable pipe 12 from the discharge port 12a on the left side of FIG. 2 to the flexible pipe 11 via the joint 12b. 20 can be supplied.

By the way, when the mud is sent by the pipe extension device 10, one pipe 8 is arranged in the sheath pipe 17 located at the sheath pipe standby position ST1, and the pipe 8 is used as a mud pipe through this. The muddy water 20 may be supplied, and the sheath pipe 17 itself may form the mud-sending conduit 70. However, the muddy water 20 is not connected inside the pipe extension device 10 and will be connected from now on. As shown in FIG. 5, the joint portion of the pair of pipes 8 that are adjacent to each other in series in the shape is located between the connecting cylinder 35 and the sheath pipe 17 located at the sheath pipe standby position ST1. The connecting mechanisms provided at both ends of the pipe 8, that is, the female joint portion 91 and the male joint portion 92 are arranged to face each other. That is, as shown in FIG. 5 or 6, the pipe 8 constitutes the pipe 8 together with its internal space for forming the mud-sending conduit 70 for the length L1 (shown in FIG. 2) of the pipe 8. A single joint 9 as a tubular body is provided, and a female joint portion 91 is provided as a first connecting mechanism at a rear portion, which is one end of the single casing 9 and is shown in the arrow B direction. The female joint portion 91 has a shape in which the inner diameter of the joint portion 91 is slightly larger than the inner diameter of the single pipe 9 other than the female joint portion 91, and the engagement groove 91a is formed on the inner peripheral surface of the female joint portion 91.
Is formed along the entire circumference. On the other hand, a male joint portion 92 as a second connecting mechanism is added to the front portion of the other end of the single pipe 9 on the arrow A direction side as a second connecting mechanism on the arrow A direction side of the pipe 8 constituting the single pipe 9. The other pipe 8 has a shape that can engage with the female joint portion 91 provided at the rear portion of the single pipe 9, that is, a first pipe provided on the other single pipe 9 that is adjacent to the single pipe 9 in series. It is provided here in such a manner that it can be inserted into and connected to the female joint portion 91, which is a connection mechanism, and the male joint portion 92 has an engaging projection 92a.
Is provided in an annular shape so as to be able to engage with the engaging groove 91a formed in the female joint portion 91 of the single pipe 9 of the other pipe 8. The engaging projection 92a is configured to be expandable / contractible in the directions G and H in FIG. 5, which are inside and outside of the cross section radial direction of the muddy water pipe 7A, that is, the engaging projection 92a is the female joint portion 9a.
1. A ring-shaped member that can be reduced in diameter to a diameter corresponding to the inner diameter of 1 is fastened to the male joint portion 92 in a state of being biased toward the arrow G direction side which is the outer side in the radial direction through an appropriate spring means. ing. The single pipes 9 and 9 of the pipes 8 and 8 that are adjacent to each other in series in the directions of the arrows A and B are formed by inserting the male joint portion 92 into the female joint portion 91, as shown in FIG. The other one is configured to be inserted and connected with one touch, and an appropriate O-ring, seal, etc. are provided between the male joint portion 92 and the female joint portion 91 to be connected. Pipe 8,
The space between the joints 8 is 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 engaging projection 92a provided on the male joint 92 toward the arrow H direction which is the inner side in the radial direction. The pipes 8 which are formed by boring and are joined as described above can be disengaged only by inserting an engagement releasing pin into the pin inserting hole.

By the way, as shown in FIG. 7, the male joint portion 92 has a front end portion of the single pipe 9 which is a tubular body portion of the pipe 8, that is, the other end side when the female joint 91 of the single pipe 9 is provided. In the joint main body 92A that is a connection adapter member fitted to the outer periphery of the single pipe 9, that is, in the front portion shown in the vicinity of the end of the joint main body 92A in the direction of arrow A, The engagement protrusions 92a are arranged so as to surround the outer circumference of the joint body 92A. On the front side of FIG. 7 of the joint body 92A, a defective region 92s is formed in such a manner that a rear half of the joint body 92A has a semi-annular shape, and the single pipe 9
The connection adapter provided in the above is formed so as to be aligned with the defective region 92s, and the joint body 92A is fitted to the split piece 92B detachably fitted to the joint body 92A. By these 92A,
92B has a cylindrical shape surrounding the outer peripheral portion of the single pipe 9,
The male joint portion 92 of the single pipe 9 is configured. A portion of the single pipe 9 shown by a dotted line in FIG. 7 is a male joint portion 92 of the single pipe 9.
The joint main body 92A and the divided piece 92B constituting the above are connected and separable from each other, that is, the connection adapter formed by the joint main body 92A and the divided piece 92B is provided with these. It is configured to be connectable and separable with respect to the single pipe 9 by moving relative to the single pipe 9 in a direction intersecting the material axis direction. The joint body 92A and the split piece 9 shown in FIG.
For convenience of explanation, the state of 2B and the like shows a state in which these are disassembled from each other, but in the normal use state of the pipe 8, the joint main body 92A and the split piece 92B are cylindrical in the front part of the single pipe 9. It is in a state of being integrally assembled as a part of the single tube 9 via a sleeve 92C having a shape. Further, as shown in FIG. 6, the joint body 92A and the divided piece 92B have seal packing 92d extending along the inner peripheral surfaces of the two bodies 92A and 92B, respectively, in the single pipe 9 shown by the dotted line in FIG. It is provided in an annular shape so as to be able to seal between the outer peripheral surface of the main body portion and the outer peripheral side of the joint main body 92A and the split piece 92B, as shown in FIG. A threaded portion 92e is formed in a male screw shape so as to straddle these along the outer peripheral surface.
As shown on the right side of the joint body 92A and the divided piece 92B in which the screw portion 92e is formed in FIG. 7, the threaded portion 92e is connected with the joint body 92A and the divided piece 92B integrally. A cylindrical sleeve 92C for forming a part of the tube 9 is
The inner screw 92f formed on the inner peripheral side of 2C is the screw portion 92
It is screwed into A and is fitted therein. further,
As shown in FIG. 6, on the outer peripheral sides of the joint main body 92A and the divided pieces 92B, a seal body made of a water-proof elastic material is formed in an annular shape so as to project further outward than the outer peripheral surface of the male joint portion 92. The seal 93 is fitted and mounted, and the seal 93 is provided in an annular shape along the outer periphery of the single pipe 9, and the outer peripheral portion thereof is the inner peripheral surface of the connecting cylinder 35 or the connecting cylinder 35. By connecting to the inner peripheral surface of the sheath pipe 17 formed to have the same inner diameter as the above, the connection cylinder 35 or the sheath pipe 17 can be sealed. Further, the seal 93 is connected to the connecting cylinder 35.
Alternatively, it is slidable with respect to each inner peripheral surface of the sheath tube 17 positioned at the sheath tube standby position ST1.

Since the tunnel 1 or the like being constructed has the above-mentioned structure, in order to construct the tunnel 1, the cutting blade portion of the shield device 2 is rotationally driven so that the ground 3 has a circular cross section. Formed in such a way that the tunnel 5 is advanced from the direction of the arrow B toward the direction of the A direction by digging in an eggplant shape and sequentially constructing and covering the segments from the inside of the shield device 2 directly to the rear thereof. I will do it. Thus, the ground 3
When trying to form a mineway 5 by carving out
The face portion 5a is disturbed by the shield cutting blade and has not yet been lined with a segment, so that it exhibits an unstable state, is sludged, and collapses. Therefore, when excavating the ground 3, via the mud sending line 70 of the mud equipment 7,
The muddy water 20 is pressure-fed from the partition wall of the shield device 2 to the cutting blade to excavate while ensuring the stability of the cutting face 5a. Further, the gap formed by the shield cutting blade excavating the ground 3 is mixed with the mud water 20 pressure-fed by the mud-sending conduit 70 as described above, and has the same structure as the mud-sending conduit 70. Through the drainage pipe (not shown)
In such a way that it is discharged to the outside of the mineway 5 in the direction of sludge,
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 the most leading position of the mud pipe 7A. Placed in pipe 8
As shown in FIG. 8, the open end 9a of the above is arranged so as to be arranged at the left end portion POS1 in FIG. 8 of the front end portion of the sheath tube 17 located at the sheath pipe standby position ST1 shown in the lower side of FIG. The frame 13 of the tube extension device 10 is positioned. In this state, first, before and after the sheath tube standby position ST1, the plug cylinder 121 and the connection cylinder 35 are driven to project,
The plug cylinder 1 is formed by connecting the respective seal rubbers 122 and 351 to the rotor flanges 18 and 19.
21 and the connection cylinder 35 are connected to the rotating body 14. Then, the plug cylinder 121 and the connecting cylinder 35 are thereby moved to the sheath tube standby position ST1.
And the connecting cylinder 35.
The interior 35 s of the sheath pipe 17 and the interior 17 s of the sheath pipe 17, and the interior 12 s of the movable pipe 12 and the interior 17 s of the sheath pipe 17 are shield-coupled by seal rubbers 122 and 351 respectively. Then, the mud transport line 70 has the plug cylinder 121 and the connection cylinder 35 in which the respective seal rubbers 122 and 351 are connected to the rotor flanges 18 and 19.
By this, the pipe is cut off from the mud pipe distribution spaces 70s and 70p, whereby the pipe 8 at the foremost position is located in the inside 17s of the sheath pipe 17 located at the sheath pipe standby position ST1. Mud pipeline 70 formed by 7A
Is directly shielded and connected to the shield device 2 side, and the closed state of the mud transport line 70 is secured. Therefore, the shield device 2 is provided through the mud-sending conduit 70 thus secured in a straight line.
In order to send the muddy water 20 to the bottom, the rear end of the plurality of pipes 8 forming the mud sending pipe 7A from the wellhead 5c (the end portion on the arrow B side)
The muddy water 20 is supplied to the above, and the muddy water 20 is pressure-fed in the direction of arrow A at a predetermined pressure via a pressure-fed pump facility (not shown) or the like. Then, the muddy water 20 supplied from the mine mouth 5c to the mud sending pipe 7A passes through the mud sending pipe 70, and as shown in FIG. 8, the opening end 9 of the pipe 8 at the most front position of the mud sending pipe 7A.
The movable pipe 1 is discharged from the inside a of the pipe extension device 10 and flows into the inside 12s of the movable pipe 12 by the pressure-feeding force.
2 is discharged to the flexible pipe 11 from the discharge port 12a illustrated at the left end in 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 muddy water 20 supplied to the cutting face 5a and discharged to the wellhead 5c through the mud discharge pipe line, after removing the gravel, the mud sending pipe. 7A and the mud water 20 flow in opposite directions, and the inside of the sludge pipe is pressure-fed in the direction of arrow B through the mud pipe, and the pit 5c and so on
Discharge to the outside.

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 pipes 17 arranged in No. 4, new pipes 8'to be added to the pipes 8 forming the most leading position of the mud pipe 7A are stored here, respectively, or A loading operation for storing the sheath tube 17 is being performed. At this time, during the above-described mud feeding operation in the pipe extension device 10, the plug cylinder 121 and the connection cylinder 35 are projected so as to move the plug cylinder 121 and the connection cylinder 35 to the sheath pipe standby position ST.
By connecting to the rotating body 14 part corresponding to 1,
Sheath tube 1 positioned at sheath tube standby positions ST2, ST3, ST4
Since mud can be sent in a state in which the mud pipe distribution spaces 70s and 70p which are freely communicable with 7 and the mud feed pipe line 70 are isolated, the mud pressure in the mud water distribution spaces 70s and 70p is lowered to the sheath pipe standby position ST2. , Opening the plug mechanisms 26 and 27, which are opening and closing mechanisms before and after the sheath tube 17 located in ST3 and ST4,
The mud sending pressure discharged from the connecting conduit mechanism 120 to the flexible pipe 11 side via the mud sending conduit 70 is not affected at all. Therefore, during the mud feeding, that is, during the face digging operation, in the portion other than the sheath pipe 17 positioned at the sheath pipe standby position ST1 in the mud pipe extension device 10, the mud pipe passage sheath pipe standby position ST1.
2, inside 1 of any sheath 17 located in ST3, ST4
7s and muddy water distribution spaces 70s and 70p are sufficiently lowered to load the new pipe 8'into the inside 17s of the sheath pipe 17, and the sheath pipe 17 and muddy water distribution space 70s related thereto. Arbitrary operations such as 70p muddy water removal, cleaning, and muddy water refilling can be selectively performed without affecting the mud pressure, that is, the mud continuous state is maintained during this period.

Further, the sheath tube standby positions ST2, ST3, S
The plug mechanisms 26 and 27, which are opening and closing mechanisms before and after each sheath tube 17 arranged at T4, are configured to individually block each sheath tube 17 individually before and after the plug mechanisms 26 and 27. From where it is being done, a new pipe 8 '
It is possible to shield and isolate only the sheath pipe 17 that is carrying out the loading work for the muddy water circulation spaces 70s and 70p.
That is, the empty sheath tube 17 at the position where the new pipe 8'is to be loaded.
Is in a form that is pressure-isolated from the sheath pipe 17 in which the pipe 8'is already housed, the muddy water distribution spaces 70s and 70p, and the mud transport pipe line 70, and the loading operation is performed here, and the other sheath pipes In 17, the pipe 8 ′ or the muddy water circulation spaces 70 s and 70 p accommodated therein is filled with the muddy water 20 of a predetermined pressure through the muddy water collecting mechanism 28, and the muddy water 20 is leaked to the outside of the pipe extension device 10. You can perform mud-sending work without it. Therefore, the sheath tube standby positions ST2, ST3, S
A new pipe 8'is always loaded in each sheath pipe 17 located at T4, and the pipe extension device 10 is operated so that the inside of the pipe 8'is filled with the muddy water 20 of a predetermined pressure.

Then, the shield device 2 excavates the face 5a as described above, whereby the shield device 2
If the vehicle advances in the direction of arrow A, the temporary rail 6 is extended in the direction of arrow A to move the succeeding bogie of the shield device 2 forward and the mud-sending line 70 of the muddy water equipment 7 in a manner to follow this without delay. Must be extended in the direction of arrow A along with the sludge pipe. In order to extend the mud pipe 70 in the direction of arrow A, the pipe extension device 10 is used to move the frame 13 forward, and the frame 13 is moved to the connection cylinder 35, which is the mud pipe receiving mechanism. Pipe extension work by sliding the pipe 8 relative to its axial direction and extending the pipe 8'for extension to the pipe 8 at the foremost position to extend the mud pipe 7A. I do. Since the flexible pipe 11 is deformed without extending the mud pipe 7A, the shield device 2 can be advanced to some extent.
When the device 2 advances in the direction of arrow A by a length corresponding to the length L1 of one pipe 8, the mud pipe 7A is extended.

Therefore, the extension method of the mud feeding pipe 7A and the mud feeding operation in the mud equipment 7 during this period will be described below with reference to FIGS. 8 to 10. However, in FIG. 8 to FIG. While the sheath tube standby position ST1 is set on the lower side of the
A sheath tube standby position ST2 is set in the portion shown on the upper side of the above, and the sheath tube standby positions ST1 and ST2 are arranged at positions that form 90 degrees with respect to the main axis. At the time of excavating the face 5a (that is, when mud is sent), as described above, the open end 9a of the pipe 8 which constitutes the most leading portion of the mud feed pipe 7A is as shown in FIG. The sheath pipe 17 located at the sheath pipe standby position ST1 is arranged at the left end arrow POS1 position in FIG. Therefore, first, the hydraulic clamp 37 is released as shown in FIG. 8, and in this state,
The frame 13 of the pipe extension device 10 is moved forward by the length corresponding to the length L1 of the pipe 8 in the arrow A direction via the temporary rail 6 with respect to the installed mud transport pipe 7A. Then, by the forward movement operation of the frame 13, the open end 9 is inserted into the internal space 35s of the connection cylinder 35.
As shown in FIG. 9, the pipe 8 located in the sheath pipe 17 where a is located at the sheath pipe standby position ST1 passes through the inside of the grip portion 37a of the hydraulic clamp 37, and as shown in FIG. On the other hand, it relatively moves in the direction of arrow B. Therefore, by this, the open end 9a of the pipe 8 is retracted to the position POS2 in FIG. 9, which is the rear side of the sheath pipe 17 arranged at the sheath pipe standby position ST1. It should be noted that the movement of the pipe 8 forming the foremost portion 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, The portion of the laid mud pipe 7A arranged on the rear side of the pipe extension device 10 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 moved to the position shown in FIG. 9P.
When retracted to the OS2 position, one extension pipe 8'is added to the sheath pipe standby position ST1 shown in the lower side of FIG. 9 so as to be arranged between the open end 9a and the movable pipe 12. A void SP is obtained. Therefore, the sheath tube standby position ST
A new pipe 8 ′ is loaded into the space SP formed in 1 and the pipe extension work is performed by connecting the new pipe 8 ′ to the pipe 8 whose open end 9a is retracted to the POS2 position. , 8 ′ are connected, that is, while the gap SP is formed in the sheath pipe 17 arranged at the sheath pipe standby position ST1 as shown in FIG. No. 20 flows from the open end 9a toward the inside 12s of the movable pipe 12 through the inside 17s of the sheath pipe 17 itself arranged at the sheath pipe standby position ST1, and the mud is not interrupted. Absent.

That is, as described above, when the frame 13 is moved forward while continuing to feed mud, the muddy water 20 discharged from the opening end 9a at a predetermined pressure has the discharge pressure, and the rotating body 14 and the stator flange 15 To the interior 17s of the sheath pipe 17 through a gap between the inner peripheral surface of the sheath pipe 17 in which the opening end 9a is arranged and the outer peripheral face of the pipe 8, Is the inside 17
It is assumed that the muddy water circulation space 70p side does not enter through the s or the like. At this time, the mud transport line 70 is now connected to the plug cylinder 12
1 and the connecting cylinder 35 are driven to project, and the seal rubbers 122 and 351 mounted on the projecting tips are connected to the sheath pipe 17 located at the sheath pipe standby position ST1 via the rotor flanges 18 and 19, respectively, so that the rotor is rotated. By being connected to the 14 side, the inflow and circulation of the muddy water 20 from the muddy water pipe 70 to the muddy water circulation spaces 70s and 70p are prevented. In addition to this, at the front end portion shown in the arrow A direction side end portion of the pipe 8 forming the leading portion of the mud pipe 7A, an annular seal 93 is formed on the outer periphery of the single pipe 9 as a sheath pipe. Since it is slidably connected to the inner peripheral surface of the sheath pipe 17 at the standby position ST1 to form a seal between the single pipe 9 and the sheath pipe 17, the discharge from the open end 9a is thereby performed. It is avoided from the situation that the muddy water 20 to be infiltrated and flowing into the gap between the inner peripheral surface of the sheath pipe 17 and the outer peripheral surface of the pipe 8. That is, the pressure muddy water discharged from the open end 9a is prevented from leaking from the inside of the pipe extension device 10 to the outside of the rear side of the pipe extension device 10 through the gap between the sheath pipe 17 and the pipe 8. .

Furthermore, in the unlikely event that the inner peripheral surface of the sheath pipe 17 and the pipe 8
Even if muddy water 20 enters the gap between the outer peripheral surfaces of the
0 is the connecting cylinder 3 at the rear of the connecting cylinder 35.
The inner peripheral surface of the pipe 5 and the pipe 8 inserted through the inside 35s
The pipe seal 36, which is shaped so as to seal between the outer peripheral surface and the outer peripheral surface, provides a good seal and reliably prevents the leak. At this time, during the forward movement operation of the frame 13, the opening end 9a, which is the tip of the mud feeding pipe 7A, is relatively moved from the POS1 position in FIG. 8 to the POS2 position in FIG. 9, thereby constituting the opening end 9a. The joint portion of the pipe 8 and the other pipe 8 already connected to the rear side of the pipe 8 as shown in FIG. 6 arranged near the POS 2 ′ position in FIG. With the male joint portion 92 engaged and connected, the male joint portion 92 passes through the internal space 35 s of the connection cylinder 35 and is delivered to the rear side of the pipe extension device 10. As a result, as shown in FIG. 6, a female joint portion 91 and a male joint portion 92 are provided at the rear portion and the front portion of each of the single pipes 9 at the joint portion of the pipes 8 which are adjacent in series in the front-rear direction. Therefore, the female joint portion 91 and the male joint portion 92 have a diameter larger than the outer diameter of other portions of the single pipe 9 other than where the female joint portion 91 and the male joint portion 92 are provided. However, since a plurality of pipe seals 36 each made of an annular flexible material are provided in the rear portion of the connecting cylinder 35 in the front-rear direction, the pipe 8 , 8 pass through the internal space 35s, the pipe seal 36 sequentially deforms elastically following the expanded diameter of the joint of the pipes 8, 8 and the inner peripheral surface of the connecting cylinder 35. With the outer periphery of the pipe 8 Seal by multiple layers between, wherein the tube extension device 10 inside the mud 20 can be prevented from leaking to the outside tube extension device 10. Then, as described above, the pipe 8 is sealed with the connecting cylinder 35 by the seal 93 annularly provided at the front end portion of the single pipe 9, and the connecting cylinder 35 is sealed.
It becomes the form which slides along the axial direction relative to the. Therefore, when the frame 13 is moved forward, the outer peripheral side of the pipe 8 is doubly sealed by the seal 93 provided on the pipe 8 itself and the pipe seal 36 provided on the connection cylinder 35. The joint portion of 8 is smoothly sent to the rear side of the connecting cylinder 35.

In this way, the open end 9a of the pipe 8 disposed inside the sheath pipe 17 at the sheath pipe standby position ST1 by the forward movement of the frame 13 is retracted to the POS2 position as shown in FIG. Plug 2 of the plug mechanism 26
9, the opening / closing cylinder 32 of each plug mechanism 27, the plug cylinder 121 of the connecting conduit mechanism 120, and the connecting cylinder 3
By driving backward movement of 5 as shown in FIG. 9, respectively, a plug 29 having a shape for closing the front and rear of each sheath tube 17,
The open / close cylinder 32, together with the plug cylinder 121 and the connecting cylinder 35, are attached to the front and rear rotor flanges 1, respectively.
Cut off the edges from 8 and 19, these 29, 32, 121,
35 retracts the connection to the stator flanges 15 and 16 side. Then, first, the plug 29, the opening / closing cylinder 32, the plug cylinder 121, and the connecting cylinder 35 are retracted and retracted as shown in FIG. 9 to connect the mud sending pipe 70 and the mud circulation spaces 70s and 70p, and
The muddy water circulation spaces 70s and 70p and the sheath pipe standby position SP2,
The inside 17s of the sheath pipe 17 located at SP3 and SP4 or the inside of the single pipe 9 of the pipe 8'contained therein communicates with each other,
Even in this state, the muddy water 20 can be continuously pressure-fed and supplied through the mud-sending conduit 70. In this way, the mud-sending conduit 70 and the mud-flowing spaces 70s and 70p communicate with each other, so that the pipe extension device 10 has a state in which the space formed therein is filled with the pressure mud. In the pipe 8 forming the open end 9a positioned at the POS2 position, a seal 93 is provided in the front part of the single pipe 9 near the open end 9a, and the seal 93 serves as a mud pipe receiving mechanism. There is a gap between the inner peripheral surface of the connecting cylinder 35 in which the pipe 8 is inserted through the inside 35s thereof and the outer peripheral surface of the pipe 8 formed by the single pipe 9, and the connecting cylinder 35 is further sealed. In the rear part, since the pipe seal 36 seals between the inner peripheral surface of the connecting cylinder 35 and the outer peripheral surface of the pipe 8, in this state, the pressure muddy water inside the pipe extension device 10 leaks to the rear side of the connecting cylinder 35. Danger of Sex is avoided.

Thus, the plug 29 and the opening / closing cylinder 32
9 together with the plug cylinder 121 and the connecting cylinder 35, when the front and rear rotor flanges 18 and 19 are respectively trimmed, as shown in FIG.
The rotating body 14 constituted by 19 and four sheath tubes 17 suspended between them is released in a rotatable manner with respect to the stator flanges 15 and 16. In this state, by rotating the main shaft 21 by a predetermined rotational drive amount via the hydraulic motor 23 and the drive gear 22, the rotary body 14 is rotated about the axis CT0 of the main shaft 21, for example, an arrow M.
Rotate 90 degrees in the direction (or N direction). As described above, in FIGS. 8 to 9, the sheath tube standby position ST1 is arranged at a position that makes an angle of 90 degrees with respect to the sheath tube standby position ST2 shown in the upper part of these figures. Therefore, when the rotating body 14 is rotated 90 degrees in the direction of the arrow M through the main shaft 21 in this way, the four sheath tubes 17 are placed at 90
The sheath tube is moved to the position where the sheath tube standby position ST is moved forward (in the state shown in FIG. 8).
1, the sheath tube 17 with the pipe 8 retracted from the inside so that the opening end 9a is disposed at the rear side POS2 position by the forward movement of the frame 13 is the sheath tube standby position ST1 as shown in FIG. From 90 degrees to the sheath tube standby position ST4 located on the arrow M direction side, and moves to a portion not shown in FIG. At the same time, the sheath tube standby position ST1 in which the space SP was formed by the retracting of the pipe 8
First, (in the state shown in FIG. 8) the sheath tube standby position ST2
The sheath pipe 17 in which one pipe 8 ′ is housed is disposed in the interior 17s thereof, whereby the space ST
, A new pipe 8'is arranged in series in such a manner that the material axis of the single pipe 9 is aligned with the material axis of the single pipe 9 of the pipe 8 that constitutes the leading portion of the mud pipe 7A. It The new pipe 8'is not yet connected to the pipe 8 forming the foremost part of the muddy water pipe 7A, but the rotating body 14 described above is used.
Prior to the rotation driving operation of the plug 29, the opening / closing cylinder 3
2. When the plug cylinder 121 and the connection cylinder 35 are retracted, the plug 29 and the opening / closing cylinder 32 are closed. Muddy water distribution space 70 communicating with the pipe 70
s, 70p to the inside of each pipe 8'through the mud transmission line 70
Since the mud water 20 therein is in a state of flowing at a pressure substantially equal to that of the mud-sending conduit 70, the new pipe 8'in the sheath pipe 17 newly arranged at the sheath pipe standby position ST1 Before entering the sheath pipe standby position ST1, the muddy water 20 of a predetermined pressure substantially equal to that of the mud-sending conduit 70 circulates in the interior before continuing to rotate to the sheath pipe standby position ST1. . That is, during the rotating operation of the rotating body 14, the rotating body 1
The sheath tube 17 in 4 replaces each other's position,
It will move to the sheath tube standby position which is adjacent 0 degrees. Therefore, during the rotating operation of the rotating body 14, the connecting cylinder 35
Between the movable pipe 12 and the movable pipe 12, a state in which the sheath pipe 17 is not arranged appears at the sheath pipe standby position ST1 used as the mud transport line 70 except during the rotation operation.
At this time, the open end 9a of the laid mud pipe 7A is shown in FIG. 9PO.
Muddy water 20 discharged into the pipe extension device 10 at the S2 position
9 passes through the inside 17s of each sheath pipe 17 through the muddy water circulation space 70p and is pressure-fed to the movable pipe 12 side of the connection pipeline mechanism 120 through the muddy water circulation space 70s. The state of circulation under the pressure of is continued. Therefore, even when the sheath pipe 17 is rotated through the main shaft 21 and when the new pipe 8'in the sheath pipe 17 is still not connected to the pipe 8 of the installed mud pipe 7A, the movable pipe 12 The discharge pressure of the muddy water 20 discharged from the discharge port 12a to the flexible pipe 11 does not decrease, and the mud feeding is always continued in a predetermined state.

When the new pipe 8'is thus arranged at the sheath tube standby position ST1, the open end 9a of the pipe 8'is retracted to the POS2 position as described above and the new pipe to be joined thereto. As for 8 ', as shown in FIG. 5, PO is a position where the open end 9a of the pipe 8 is retracted.
At the S2 position, the male joint portion 92 of the joint body 92A fitted to the single pipe 9 forming the pipe 8
Is opposed to the female joint portion 91 of the new pipe 8 '. Therefore, in this state, as shown in FIG.
First, the hydraulic clamp 37 is driven so that the grip 37
The pipe 8 at the foremost position of the mud transport pipe 7A already laid in a.
Hold the outer periphery of the. That is, the pipes 8 constituting the laid mud pipe 7A are temporarily fixed to the inverts 5b and the like as described above.
Of these, the pipe 8 currently arranged at the foremost position is not yet temporarily fixed, so that the portion that is not temporarily fixed is reliably gripped by the hydraulic clamp 37. In this way, when the movable pipe 12 of the connection conduit mechanism 120 is driven to project toward the arrow B direction side, that is, the sheath pipe 17 positioned at the sheath pipe standby position ST1, the movable pipe 12 is sheathed by the projecting operation. By pushing the new pipe 8'located at the pipe standby position ST1 in the direction of arrow B,
The female joint portion 91 of the new pipe 8'is fitted to the male joint portion 92 of the pipe 8 on the rear side (arrow B direction side) in FIG. 5 of the new pipe 8 '.

That is, as shown in FIG. 8, the new pipe 8'contained in the inside 17s of the sheath pipe 17 positioned at the sheath pipe standby position ST1 has its front end to become the open end 9a later. Is the position POS at the sheath tube standby position ST1
In the state of being positioned slightly forward of 1
By the rotation operation of, the sheath pipe standby position ST2 is moved and positioned to the sheath pipe standby position ST1. In this state, the new pipe 8 ′ is pushed toward the rear side of the new pipe 8 ′, that is, the pipe 8 at the installed top position by the movable pipe 12 that is a part of the connection pipe line mechanism 120, and 5 and FIG.
As shown in FIG. 5, the engagement projection 92a on the pipe 8 side is temporarily reduced in diameter toward the arrow H direction, which is the inner side in the radial direction, through the inner peripheral surface of the female joint portion 91, so that the pipe 8 ′ is movable. When it is pushed by, it is moved further in the direction of arrow B, so that the engaging projection 92a and the engaging groove 91 are moved.
When a is aligned and aligned, the once-reduced engagement projection 92a is radially outward in the engagement groove 91a on the pipe 8'side via the spring force applied to the engagement projection 92 itself. The male joint portion 92 and the female joint portion 91 are engaged with each other so as to expand in diameter in the direction. As a result, the pipes 8 and 8 ′ can be simply installed in the existing pipe 8 without relying on a jig or the like other than the pipe extension device 10 and without the need for bolting.
A male joint portion 92 which is the second connecting mechanism provided in the form of pressing a new pipe 8 ′ from the front side of the above, that is, provided in the single pipe 9 constituting the pipe body of the existing pipe 8,
In the form of being inserted and connected to the female joint portion 91 which is the first connecting mechanism provided in the single pipe 9 which constitutes the new pipe 8'which is adjacent to the single pipe 9 in series, The pipes 9 and 9 adjacent in the series direction are connected by one touch, whereby a new pipe 8'is added to the pipe 8 that has constituted the foremost portion of the mud pipe 7A.
Thus, the mud pipe 7A is extended by the length corresponding to the length L1 of the pipe 8 (that is, the length corresponding to the amount of forward movement of the frame 13). In addition, the pipe 8 once joined through the joint portions 91 and 92 in this way,
The joint portions 91, 92 of the 8'single pipes 9, 9
The engaged state is firmly engaged so that it cannot be disengaged unless the engagement release pin or the like is inserted into the pin insertion hole. In addition, the male joint portion 92 and the female joint portion 9 are provided between the pipes 8 and 8 which are adjacent to each other in the directions of arrows A and B.
By providing an O-ring, etc. with 1,
In a form where muddy water 20 cannot leak from between the pipes 8 and 8 ',
The mud transport line 70 is continuously formed in the directions of arrows A and B.
Further, in the single pipe 9 which is the pipe body of the pipe 8, a seal packing is provided between the joint main body 92A and the split piece 92B which form the male joint portion 92 and the main body of the single pipe 9 as shown in FIG. Since 92d is provided in an annular shape, the muddy water 20 from the male joint portion 92A assembly position is
Leakage is also reliably prevented. It should be noted that the mud sending operation of the mud water 20 is continued during the joining operation of the pipes 8 and 8 ′ thus performed.

In this way, the end portion of the newly joined pipe 8'on the side of the arrow A, which is the non-joining side opening end, becomes a new opening end 9a of the muddy water pipe 7A.
a is again arranged at the POS1 position of the sheath tube standby position ST1 shown in FIG. In this state, the mud feeding continues as before, but here again (that is, after the rotating operation of the rotating body 14 is completed and while the pipes 8 and 8 ′ are joined by the movable pipe 12) again. As described above, if the plug cylinder 121 and the connection cylinder 35 are projected and the seal rubbers 122 and 351 are connected to the rotating body 14 side, the inside 17 of the sheath pipe 17 located at the sheath pipe standby position ST1
s (that is, the inside of the pipe 8 which is now the most front part of the mud transport pipe 7A and is accommodated therein) is the connecting cylinder 35.
35s and the interior 12s of the movable pipe 12 in the connection conduit mechanism 120 are shielded and connected to the mud-sending conduit 70 and the mud-flowing spaces 70s and 70p, respectively,
The mud-sending conduit 70 is a conduit that is surely closed straight.
With the mud-sending conduit 70 that is reliably secured by connecting the seal rubbers 122 and 351 to the rotating body 14 side, pressure loss and flow velocity fluctuations corresponding to those flowing through the mud circulation spaces 70s and 70p do not occur. As a result, a more reliable mud water distribution state is secured.

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 pipe 17 moved to No. 4 has a state in which the pipe 8 is not yet housed inside the sheath pipe 17. Therefore, in the pipe extension device 10, the sheath pipe standby positions ST2, S
At either T3 or 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. Pipe 8 ', a new mud pipe
Are 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 rear side of the pipe extension device 10 in the direction of the arrow B. The single pipe supply means is connected to the sheath pipe standby position S.
A new pipe 8'is loaded into the empty sheath pipe 17 through the single pipe supply means in a state of being aligned with the position of the cap plug 31 of any one of T2, ST3 and ST4 and prepared on the rear side thereof. In this manner, the pipes 8'are stored in all the sheath tubes 17 as quickly as possible. With this, the pipe extension device 10 has four pipe extension devices 10 even if the supply of the new pipe 8 for extending the mud transport pipe 7A is interrupted due to some circumstances that may occur during the construction process, for example. 8 minutes of at least 4 pipes in the form of being housed in the sheath tube 17 of
It is avoided that the mud pipe 7A is extended without delay, that is, the mud feed is stopped during that time, which hinders the excavation work of the cutting face 5a.

In order to load a new pipe 8'into the empty sheath tube 17, first, the empty sheath tube 17 is arranged as shown in FIG. 10, for example, as described in FIG. For convenience, the plug mechanism 26 on the arrow A direction side, which is the front side of the illustrated sheath tube standby position ST4, is driven above the sheath tube standby position ST1 to drive the plug 29 toward the arrow B direction side and provided at the protruding tip thereof. The sealing rubber 293 is projected until it abuts the front end (the end on the arrow A side) of the sheath tube 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 projecting state. The left end of FIG. 10 of the sheath tube 17 arranged at the sheath tube 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 arranged at the sheath pipe standby position ST4 from the muddy water circulation space 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 direction of arrow A, 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 form the opening / closing cylinder 32 and the cap plug 31 fitted inside thereof.
The inside 17s of the sheath pipe 17 which is closed by the sheath pipe standby value ST4 and is formed between the rotor flange 19 and the stator flange 16 and the muddy water circulation space 70p, 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 provided outside the inside 17s by the protruding arrangement of the plug 29 and the opening / closing cylinder 32 with the cap plug 31 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, this is first in 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 via 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 opening / closing 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 withdrawing the cap plug 31, is provided. The 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 pipe 8'from the rear side. The pipe 8 is a connection adapter provided on the single pipe 9 at the front end side of the single pipe 9 before the pipe 8 is preliminarily conveyed into the mineway 5, and a male joint 92 is provided on the joint body 92A. The joint body 9 provided
2A and the divided piece 92B are assembled in a ring shape, and the assembled joint body 92A and the divided piece 92B are assembled into a sleeve 92C.
It is made to be screwed and fastened via, and then loaded into the sheath tube 17 of the tube extension device 10. Then, in the pipe 8 ′ loaded in the sheath pipe 17, the seal 93 provided in the joint body 92 A is slidably connected to the inner peripheral surface of the sheath pipe 17 having the same inner diameter as the connection cylinder 35. From the obtained shape, it can be smoothly loaded into the inside 17s of the sheath tube 17 and can be positioned and fixed by the seal 93 in the inside 17s.
As described above, during the forward movement operation of the frame 13 or the rotation operation of the rotating body 14, the loaded pipe 8 ′ unnecessarily moves in the inside 17s of the sheath tube 17 and collides with the inner wall portion of the sheath tube 17. The risk of doing so is prevented. After the new pipe 8'is loaded in the sheath pipe 17 in this manner, the cap plug 31 is loaded and fitted inside the opening / closing cylinder 32. Then, in this state, the air in the single pipe 9 of the pipe 8'which has been newly loaded and replenished in the sheath pipe 17 is first used by using the overflow port 291 of the plug 29, the water supply / drainage port 292, and the like. The muddy water 20 collected from the inside and stored in the tank 281 is returned to the inside of the single pipe 9 of the pipe 8 ′ and is replaced with the muddy water 20 having a predetermined pressure.

Thus, the sheath tube 17 which has been disposed at the sheath tube standby position ST4, that is, the sheath tube standby position ST1 previously (in the state shown in FIG. 8), is moved to the state shown in FIG. 9 by the forward movement of the frame 13. As shown, the opening end 9a is the PO on the rear side.
The pipe 8 is retracted from the inside so as to be arranged at the S2 position, and the sheath pipe 17 whose interior 17s is emptied is refilled with a new pipe 8 ', and the pipe 8'is refilled. The inside of the single pipe 9 forming the body is filled with muddy water 20 at a predetermined pressure. Thus, for example, at the sheath tube standby position ST4, in order to replenish the empty sheath pipe 17 with a new pipe 8 ', the plug 29 and the opening / closing cylinder 32 are arranged to project so that the sheath pipe standby position ST4.
The inner 17s of the sheath pipe 17 to be arranged only in No.
Since the new pipe 8'can be replenished and loaded in a state in which it is isolated from the muddy water distribution spaces 70s and 70p, the mud transport pipe 70 or another sheath that has not been loaded with the pipe 8 ' Since the pressure of the muddy water 20 can be maintained in the pipe 17, the muddy water 20 discharged into the flexible pipe 11 can be sent without lowering the pressure during the replenishment and loading operation of the new pipe 8 '. You can continue the mud.

In order to replenish the empty sheath tube 17 with a new pipe 8 ', as described above, the plug mechanism 26,
After closing the plug 29 and the opening / closing cylinder 32 by 27, the mud water 20 of a predetermined pressure is once collected from the inside 17s of the sheath pipe 17 via the mud collection mechanism 28, and the cap plug 3
1 is removed from the open / close cylinder 32, the loading port 33 is formed and opened, and then the pipe 8'is loaded, and then the mud water 20 is charged again at a predetermined pressure. Since the length L1 is as long as 5.0 to 6.0 m in the embodiment, a relatively long working time is required for supplementary loading of the pipe 8 '. However, during this period, as described above, the seal rubbers 122, 35 are driven by the projecting drive of the plug cylinder 121 and the connecting cylinder 35.
If 1 is connected to the rotating body 14 side, the sheath tube standby position ST
The mud conveying line 70 using the sheath pipe 17 positioned at 1 is
Movable from the open end 9a in a form completely isolated from the sheath pipe 17 positioned at the sheath pipe standby positions ST2, ST3, ST4, that is, without connecting the muddy water circulation spaces 70s and 70p to the mud feed pipe line 70. Since only the mud sending conduit 70 is directly shielded toward the flexible pipe 11 side through the inside 12s of the pipe 12, the mud sending is carried out through the shielded mud sending conduit 70. Sheath tube standby position ST2, ST3, S
Sheath pipe 17 and muddy water circulation space 70 positioned on the T4 side
It can be continued regardless of the open / closed state of s and 70p. Therefore, at the time of mud sending through the mud sending conduit 70 with the shield formed, the pod 17 positioned at the pod waiting positions ST2, ST3, ST4 and the mud circulation spaces 70s, 70p.
On the side, the plug mechanisms 26, 27 and the muddy water recovery mechanism 28 are driven at an arbitrary timing to efficiently load new pipes 8'at the respective sheath tube standby positions ST2, ST3, ST4. You can proceed to. Therefore, the loading work of the pipe 8 ′, which takes time to extract and collect the muddy water 20 and to refill the muddy water 20 in this way, may be performed simultaneously at three positions of the sheath tube standby positions ST2, ST3, and ST4.

Thus, as described above, the internal 17s
In FIG. 10, a plug 29 corresponding to the sheath tube 17 at the sheath tube standby position ST4 is replenished with a new pipe 8 '.
When the plug mechanism 26 is opened again by driving backward in the direction of arrow A, the plug 29 is withdrawn in the plug retreat hole 15s of the stator flange 15 and slips out from the hole 18s side of the rotor flange 18. The interior 17s of the sheath pipe 17 at the sheath pipe standby position ST4 communicates with the muddy water circulation space 70s again through the hole 18s from which the plug 29 is removed. Similarly, here, when the open / close cylinders 32 are respectively retracted, the inside 17s of the sheath pipe 17 communicates with the muddy water circulation space 70p. As a result, the inside of the single pipe 9 of the pipe 8'which has been newly refilled into the sheath pipe 17 is
However, at this time, the muddy water 20 from the tank 281 has already passed through the muddy water collecting mechanism 28 at a predetermined pressure in the single pipe 9 of the pipe 8 ′ in which the plug 29 is now opened. From where it is restored to the filled state,
By opening the plug 29, the muddy water circulation spaces 70p, 7p
There is no risk that the muddy water 20 filled in the interior 17s of the sheath pipe 17 communicating with the interior for 0 s will drop in pressure. Therefore, in the pipe extension device 10, the portion other than the sheath pipe 17 in which the single pipe loading operation is performed is filled with the muddy water 20 at a predetermined pressure, so that the mud feeding pipe when the rotating body 14 rotates as described above. It is possible to prevent the pressure of the muddy water 20 from dropping when the passage 70 and the muddy water circulation spaces 70s and 70p are communicated with each other. As a result, the muddy water 20 is always sent in a stable state to the face 5a of the shield device 2 via the muddy water conduit 70.

The space between the rotor 14 and the stator flange 15 or 16 used as the muddy water circulation spaces 70s and 70p in the pipe extension device 10 is supplied with clean water through the cleaning mechanism 39 and drained. By doing so, the pipe extension device 10 can be cleaned in a flushing manner, so that the pipe extension device 10 is always kept in good watertightness and is free from clogging of the muddy water 20 for a long period of time. Can be used. At this time, in the pipe extension device 10, the plug cylinder 121 and the connection cylinder 35 are driven to protrude so that the seal rubbers 122 and 35 are formed.
By connecting 1 to the rotating body 14 side, the inside 17s of the sheath pipe 17 at the sheath pipe standby position ST1 is shielded and connected to the inside 35s of the connecting cylinder 35 and the inside 12s of the movable pipe 12 to form the mud pipe line 70. Muddy water distribution space 70s, 70p
And the sheath tube standby position ST2, S
Inside 17 of the sheath tube 17 located in each of T3 and ST4
Since s can be selectively opened and closed via the plug mechanisms 26 and 27, the cleaning mechanism 39 can be driven at any timing.

Thus, the sheath tube standby positions ST2, ST3,
The pipes 8 ′ with the male joint portions 92 assembled therein are housed in the inside 17 s of each sheath pipe 17 arranged in ST 4, and the muddy water recovery mechanism is provided in the single pipe 9 of each pipe 8 ′. The muddy water 20 is filled at a predetermined pressure via 28, and the inside of the single pipe 9 of the pipe 8 ′ is filled with the muddy water circulation spaces 70p, 7p.
Preparation is made so that the muddy water pressure does not drop when communicating with 0 s. On the other hand, at the sheath tube standby position ST1, before and after the sheath tube 17 positioned here,
By projecting the plug cylinder 121 and the connection cylinder 35, the mud transport line 70 is moved to the mud flow space 70s, 7s.
0p closed state, that is, the seal rubber 12
The inside 3 of the connection cylinder 35, which is a mud pipe receiving mechanism that receives the laid mud pipe 7A by 2,351.
5s and the inside 17s of the sheath pipe 17 positioned at the sheath pipe standby position ST1 and the movable pipe 1 in the connection pipeline mechanism 120.
By shielding and connecting the inside 12s of 2, the mud-sending conduit 70 is directly shield-connected to the shield device 2 side, and the mud-sending conduit 70 in which the shielding state of the conduit is secured by As described above, the pipe 8 in the state of being inserted into the connecting cylinder 35 without stopping the pressurized supply of the muddy water 20.
With the seal 93 provided on the outer circumference of the single pipe 9, the mud water in the mud-sending conduit 70 is not leaked to the outside of the pipe extension device 10, and the excavation work of the face 5a is continuously continued. Then, if the shield device 2 moves forward by the length L1 of one of the pipes 8 constituting the mud pipe 7A,
Again as mentioned above, the frame 13 of the tube extension device 10
By sliding the pipe 8 relative to the connecting cylinder 35 with respect to the axial direction of the connecting cylinder 35 in the form of advancing the shield device 2 by the advancing amount, and then retracting the connecting cylinder 35 and the plug cylinder 121. Seal rubber 12
2, 351 is separated from the rotating body 14 side, and the muddy water circulation space 7
0s, 70p and the mud sending pipe 70 are connected to each other, the mud sending pipe 7A is formed by adding a new pipe 8'to the pipe 8 through the rotating operation of the rotating body 14 and the projecting operation of the movable pipe 12.
Of the mud pipe 7A, on the other hand, the operation of replenishing and loading a new pipe 8'onto the sheath pipe 17 whose interior 17s has become empty by adding the pipe 8'to the mud pipe 7A,
By repeating the mud-sending conduit 70 in a state where the mud-sending conduit 70 is directly shielded, the mud-water 20 is continuously fed without any pause, that is, while the cutting face 5a is continuously excavated in a stable state. The mud pipe 7A can be extended easily. Therefore, in order to extend the mud transport pipe 7A, it is not necessary to temporarily cut the mud transport pipe 70 to temporarily suspend the mud transport, and all pipe extension work is processed inside the pipe extension device 10. In addition to being efficient, by not cutting the mud transport line 70, the labor required for pipe extension work can be saved.
Further, in the pipe extension device 10, the muddy water 20 does not overflow into the gallery 5, so the cleaning labor can be omitted.

By the way, when performing the excavation work using the shield device 2 while sending mud by the mud sending pipe 7A,
During this time, the mud water 20 may be clogged in the mud sending line 70. At this time, in the mud pipe 7A,
Of the plurality of pipes 8 each of which is one mud pipe constituting the mud transport pipe 7A, only the single pipe 9 of the pipe 8 in which the mud water 20 is clogged is clogged. Single pipe 9 of another pipe 8 adjacent to the single pipe 9 of the pipe 8 in the serial direction
It is possible to release and separate the joined state with respect to, to remove only one from the mud sending pipe 7A, remove and clean the clogged mud water 20, and re-install the cleaned single pipe 9 into the mud sending pipe 7A. is there. First, as shown in FIG.
A male joint portion 92 at the end of the pipe 8 in the arrow A direction where the clogging point P1 has occurred, and another male joint portion 92 at the rear side of the pipe 8 arranged on the arrow B direction side of the clogging point P1. In each of the male joint portions 92 of the pipe 8, as shown by an arrow S1 in FIG. 7, a shape in which a joint main body 92A which is a connection adapter and a split piece 92B are fastened and integrated to loosen an inner screw 92f of a sleeve 92C. Then, remove from the screw portion 92e. Then, first, the clogging point P1
The two divided pieces 92B, which are arranged so as to sandwich the arrow in the directions of the arrows A and B, are removed by removing the sleeve 92C.
As shown in FIG. 2, that is, in the form of relative movement in the direction intersecting the material axis direction of the single pipe 9, each is removed from the male joint portion 92. As a result, defective regions 92s and 92s are formed in the male joint portions 92 and 92, respectively, which sandwich the clogging point P1 in the directions of arrows A and B. In addition,
Since each of the sleeves 92C is formed in a cylindrical shape, in this state, the sleeve 92C has a state in which it is still fitted around the outer periphery of the single tube 9. In addition, the joint main body 92A that constitutes the connection adapter together with the split piece 92B is
The engaging projection 92a of the male joint portion 92 provided here in the form of being arranged in the front portion of the joint body 92A is a female member of another pipe 8 that is adjacent to the pipe 8 in which the male joint portion 92 is provided in series. The engagement groove 91a of the joint portion 91 is maintained in a state of being engaged with each other. In this state, the split pieces 92B and 92B in which the clogging point P1 is sandwiched in the directions of the arrows A and B are the joint bodies 92A and 92B.
The single pipe 9 shown by the dotted line in FIG. 7 of the pipe 8 in which the clogging point P1 is generated due to the removal of the defective regions 92s and 92s from the A is clogged at the end portion in the arrow A direction. It is separable from the joint body 92A of the single pipe 9 itself, and at the end portion in the direction of the arrow B, the female joint portion 91 and the female joint portion 9 provided there are provided.
The joint main body 92A of the single pipe 9 of the other pipe 8 engaged with the first pipe 8 is separable from the other pipe 8, and the restrained joining state of both ends of the pipe 8 in the arrow A and B directions is shown. After being released, it becomes a shape that can be extracted from here via the defective regions 92s, 92s. That is, the single pipe 9 in which the clogging point P1 has occurred is moved to the single pipe 9 by the relative movement of the single pipe 9 and the joint body 92A and the split piece 92B in the direction intersecting the axial direction of the single pipe 9. The joint main body 92A and the divided pieces 92B are relatively separated from each other and extracted from the mud pipe 7A. As a result, the single pipe 9 which is the tubular body portion of the pipe 8 in which the clogging point P1 has occurred is connected to the joint main body 92A of the other pipe 8 on the arrow B direction side of the single pipe 9. It can be easily pulled out from the mud transport pipe 7A in a state where the portion 92 is integrally attached.
In this way, the single pipe 9 of the pipe 8 in which the clogging point P1 is generated is pulled out from the mud feeding pipe 7A, the mud water clogging in the clogging point P1 is removed and cleaned, and then the reverse operation to the above is followed. Thus, the single pipe of the cleaned pipe 8 can be promptly assembled again into the mud-sending pipe 7A and installed again. Therefore, it is possible in a short time to release the joint state of only the pipe 8 in which the clogged portion has occurred to eliminate the clogging, restore the joint state of the pipe 8 and restart the mud sending,
Even if the mud pipe 7A is clogged, the trouble of cutting the mud pipe 7A and welding it again is avoided.

The excavation scrap formed from the face 5a by the shield device 2 when constructing the tunnel 1 is carried out by the same mud pipe extension device as the pipe extension device 10, just like the mud pipe 7A described above. , Of course, the sludge operation is continuously carried out without a break, and the mud water 20 does not leak from the pipe extension device 10, and it is of course carried out to the wellhead side through the sludge pipe that is extended promptly. When one of the pipes 8 forming the sludge discharge pipe is clogged, it can be immediately removed and a corrective action can be taken immediately, so that the sludge discharge can be smoothly performed during tunnel excavation. Therefore, if the mud pipes 7A, mud pipes, and other mud pipes in the mud equipment 7 are extended by using the pipe extension device 10 to carry out mud feed and discharge, it is possible to quickly cope with sudden changes in the cutting face 5a. As a result, it is possible to always hold the cutting face 5a at a predetermined mud pressure, and when clogging occurs in the mud sending pipe 70 and the mud discharging pipe, immediately remove the clogging and quickly restore the mud sending operation. Therefore, it is possible to continue the stable excavation work at any time, and to construct the tunnel 1 safely while maintaining a good construction environment.

In the above-described embodiment, a ring shape is formed on the outer peripheral side of the joint main body 92A and the split piece 92B provided at the front part of the single pipe 9 constituting the pipe body portion of the pipe 8. The seal 93 to the connecting cylinder 3
5 and the example in which the sleeve pipe 17 formed with the same inner diameter as that of 5 is fitted and mounted in a freely connectable manner, the seal body such as the seal 93 and the connection cylinder 35 are attached to the pipe body such as the single pipe 9. It suffices if it is provided in an annular shape so as to be able to seal between it and the configured muddy water pipe receiving mechanism. Therefore, for example, the seal 93 is not necessarily connected to the inner peripheral surface of the sheath pipe 17. However, if the seal 93 is formed in an annular shape corresponding to the shape of the gap formed between the single pipe 9 of the pipe 8 and the connection cylinder 35, the shape and the single pipe 9 are Arrangement position, mounting mode, etc. are arbitrary. In addition, the mud pipe according to the present invention such as the pipe 8 is a pipe extension device 1
It is not limited to the one applied to the mud water pipe extension equipment that can be extended by using 0, and the pipe extension device for extending the mud pipe has a mud water flow passage such as the mud sending pipe line 70 inside. A mud pipe receiving mechanism that can be disposed, and is configured to be able to extend the mud pipe by sliding the mud pipe relative to the mud pipe receiving mechanism in the axial direction thereof. Anything can be used as long as it is present. Therefore, in the embodiment, the forward movement operation of the frame 13 and the operation of selectively positioning the sheath pipe 17 in which the pipe 8 is accommodated as a mud pipe in the inside 17s thereof by the rotation operation of the rotating body 14 at the sheath pipe standby position ST1. Although the example in which the entire mud pipe such as the mud pipe 7A is extended by the projecting operation on the movable pipe 12 has been described, the pipe extension device for extending the mud pipe according to the present invention uses the other means. The water pipe may be configured to be extendable. The muddy water pipe such as the pipe 8 may have any cross-sectional shape, connection mechanism, and the like as long as a plurality of pipe bodies can be connected in series.

[0051]

As described above, according to the present invention, there is a muddy water pipe receiving mechanism such as the connection cylinder 35 in which the muddy water flow passage such as the mud sending pipe 70 is arranged in the inside 35s, and the muddy water pipe is provided. In a muddy water pipe extension facility such as a muddy water facility 7 which extends the muddy water pipe by sliding a muddy water pipe such as a pipe 8 relative to the receiving mechanism in the axial direction, the muddy water pipes are arranged in series. A seal body such as a seal 93 having a plurality of connectable single pipes 9 or the like and capable of sealing between the pipe body and the muddy water pipe receiving mechanism is provided in an annular shape along the outer periphery of the pipe body. With this configuration, the muddy water pipe can slide relative to the muddy water pipe receiving mechanism while being sealed between the pipe body and the muddy water pipe receiving mechanism via the seal body. That is, the slidability of the muddy water pipe receiving mechanism with respect to the muddy water pipe is ensured, and the muddy water pipe receiving mechanism at the time of the sliding operation of the muddy water pipe receiving mechanism with respect to the muddy water pipe and at the time of sending and discharging mud through the muddy water flow path. The sealability of the part is secured. Therefore,
The mud pipe is installed in the mud pipe extension equipment so that the opening end of the existing mud pipe that has already been laid is received by the mud pipe receiving mechanism, and the mud pipe is continuously supplied to the existing mud pipe while continuing to send or discharge mud. On the other hand, when the muddy water pipe receiving mechanism is advanced along the axial direction, the existing muddy water pipe received by the muddy water pipe receiving mechanism passes through the seal body between the pipe body and the muddy water pipe receiving mechanism. In the sealed state, it can move relatively to the rear side with respect to the muddy water pipe receiving mechanism. Therefore,
In such a muddy water pipe extension facility, the front side of the muddy water pipe receiving mechanism communicates with the muddy water flow passage, that is, the inside 17s of the sheath pipe 17 in which the pressure muddy water flowing through the muddy water flow passage can be filled.
If a pressure space such as the above is provided, even when the opening end of the existing muddy water pipe is opened in the pressure space, the muddy water pipe receiving mechanism that is the muddy water pipe receiving portion to the pressure space, and the muddy water pipe Since the space between the pipe and the pipe is sealed via the sealing body as described above, the pressure muddy water filled in the pressure space, that is, the muddy water pipe extension device forming the space, receives the muddy water pipe. Leakage from the mechanical portion is reliably prevented. Then, in the state where the leakage of the pressure muddy water is surely prevented, as described above, the muddy water pipe receiving mechanism, which is the muddy water pipe inlet portion, is advanced in the axial direction of the existing muddy water pipe. By the space S in the pressure space in which the opening end of the existing muddy water pipe is open, in the pressure space where the opening end of the existing muddy water pipe is open
It is possible to form a region to which a new mud pipe such as P should be added. Therefore, a new mud pipe is arranged in the region, and it is connected and added to the existing mud pipe to add pressure mud. It is possible to extend the mud pipe while surely preventing leakage. Therefore, in such a mud pipe extension device,
The situation where the pressure muddy water concentrates in the muddy water pipe receiving mechanism which is the muddy water pipe receiving port of the pressure space provided therein, and the pressure muddy water leaks from here to the outside of the muddy water pipe extension device,
Since it is avoided by the muddy water pipe itself through the sealing body provided in the muddy water pipe body, it is possible to sufficiently maintain the watertightness of the muddy water flowing in the muddy water flow path and effectively prevent the loss of the muddy water pressure. Can be done. Further, since the watertightness of the muddy water in the muddy water flow path is maintained by the muddy water pipe itself, it is possible to simplify the sealing mechanism provided on the muddy water pipe receiving mechanism portion, that is, the muddy water pipe extension device side. Therefore, if a tunnel is constructed by the mud shield construction method using the mud pipe extension equipment to which such a mud pipe is applied, it is possible to extend the mud pipe without wasting the leaked mud, so that the tunnel can be efficiently constructed. You can build it.

[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 cross-sectional side view showing an example of a mud pipe extension device used for constructing the tunnel shown in FIG.

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 enlarged view showing a connection conduit mechanism portion located at the front part of the muddy water pipe extension device shown in FIG.

FIG. 5 is an enlarged view showing an opening tip of a muddy water pipe received by the muddy water pipe extension device shown in FIG. 2 and a connection part of a new muddy water pipe that is added to this.

6 is a diagram showing a connection state of the laid mud pipe shown in FIG. 5 and a new mud pipe connected to the laid mud pipe.

7 is a cutaway perspective view showing the muddy water pipe shown in FIG. 5 or FIG.

8 is a cross-sectional side view showing a method of extending the muddy water pipe by using the muddy water pipe shown in FIG. 7 by the muddy water pipe extension device shown in FIG.

9 is a sectional side view showing a method of extending the muddy water pipe by using the muddy water pipe shown in FIG. 7 by the muddy water pipe extension device shown in FIG.

10 is a cross-sectional side view showing a method of extending the muddy water pipe by using the muddy water pipe shown in FIG. 7 by the muddy water pipe extension device shown in FIG.

[Explanation of symbols]

 7 …… Muddy water pipe extension equipment (muddy water equipment) 70 …… Muddy water flow passage (mud feeding pipe) 35 …… Muddy water pipe receiving mechanism (connection cylinder) 35s …… Inside 8,8 ′ …… Muddy water pipe (pipe) 9 …… Tube (single pipe) 93 …… Seal (seal)

Claims (1)

[Claims] 1. A muddy water pipe receiving mechanism having a muddy water flow passage arranged therein, and the muddy water pipe is slid relative to the muddy water pipe receiving mechanism relative to the axial direction of the muddy water pipe. In a muddy water pipe extension facility for extending a water pipe, the muddy water pipe has a plurality of pipe bodies that can be connected in series, and a sealing body that can seal between the muddy water pipe and the muddy water pipe receiving mechanism is provided in the pipe body. A muddy water pipe, which is formed in a ring shape along the outer circumference of the pipe.