JP3199512B2 - Mud pipe extension device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mud pipe extension device suitable for use in connection with a shield device when a tunnel is excavated and constructed by a mud shield method.

[0002]

2. Description of the Related Art Conventionally, in shield construction by a mud shield construction method, a mud pipe for feeding and discharging mud must be sequentially extended without delay in order to hold a face and carry out excavated earth and sand with shield excavation. . Therefore, in order to perform such work of extending muddy water pipes such as mud pipes and mud pipes without stopping the mud pipes, for example, as shown in JP-A-63-293298, A pipe extension in which a pipe for extension is loaded into the extension apparatus to which the laid pipe is connected when the face has advanced by one pipe length, and the extension pipe is added thereto when the face has advanced by one pipe length. Devices have already been proposed.

[0003]

However, in the above-mentioned pipe extension device, the muddy water flow area where the opening end of the already installed muddy water pipe is disposed inside the pipe extension device, and the newly added muddy water pipe. The loading area in the loaded and housed form is kept in a pressure-separated state, a new mud pipe is first loaded into the loading area, and then the loaded mud pipe is moved to the mud circulation area. The pipe extension work is performed. For this reason, while the mud pipe extension work is being performed, that is, during the movement of the newly added mud pipe to the mud circulation area and until the mud pipe is filled with the mud, the mud pressure is slightly reduced. It cannot be denied. However, on the cutter bit side of the shield device, face excavation work continues even during the muddy pipe extension work,
Sudden changes in the face may cause lost mud, etc.
Then, even when the muddy water side muddy water pressure drops due to such a muddy water pipe extension operation, the supply pressurization of the muddy water may be required urgently. In such a case, in such a conventionally proposed device, the muddy water pressure cannot be adjusted, that is, the pressurized muddy water can be supplied to the face, until the new muddy pipe is filled with the pressurized muddy water. However, there is a disadvantage that the response to the fluctuation of the face is delayed by that amount, thereby promoting the collapse of the face such as a lost mud. Also, on the mud pipe side, there was the same problem as the mud pipe side that the amount of mud discharged from the face side to the mud pipe side could not be adjusted during the muddy pipe extension work. Therefore, in view of the above circumstances, the present invention, when extending a mud pipe such as a mud pipe and a mud pipe for use in the mud shield construction method, continuously adds a new mud pipe to the laid mud pipe. It is another object of the present invention to provide a muddy water pipe extension device capable of adjusting the muddy water pressure to an arbitrary value.

[0004]

That is, the present invention provides a first rotating body supporting means (16) and a second rotating body supporting means (15).
Are provided at predetermined intervals in the front-rear direction of the tunnel construction direction, and the first rotating body support means (16) is provided with a muddy pipe receiving mechanism (35) by the tip (9a) of the existing muddy pipe (7A).
Is provided so as to be able to receive the muddy water pipe (7A) slidably along the axis thereof, and to the muddy water pipe receiving mechanism (35) of the second rotating body supporting means (15). Connection pipe mechanisms (15a, 12) that can be connected to the shield machine (2) are provided at opposing positions, and are provided between the first rotating body supporting means (16) and the second rotating body supporting means (15). In addition, a rotating body (14) having a plurality of sheath pipes (17) capable of accommodating the muddy water pipes (9, 9 ') in each of the insides (17s) is rotatably mounted and the sheath pipe (17) is connected to the mud. Water pipe receiving mechanism (3
5) and the connecting pipe mechanism (15a, 12) are provided so as to be selectively positioned, and the first rotating body supporting means (16) and the second rotating body supporting means (15) are provided with: A loading means (26, 27) for selectively loading a muddy water pipe (9, 9 ') into the sheath pipe (17) is provided, and the first rotating body support means (16) and the rotating body (14) are provided. A first bypass flow path (70s) is formed in such a way that the muddy water pipe receiving mechanism (35) and the sheath pipe (17) of the rotating body (14) can communicate with each other;
The second rotating body support means (15) and the rotating body (1)
During 4), a second bypass flow path (70p) is formed in such a manner that the connection pipe mechanism (35) and the sheath pipe (17) of the rotating body (14) can be communicated. . The numbers and the like in parentheses are for convenience showing the corresponding elements in the drawings, and therefore, the description is not limited to the description on the drawings. The same applies to the following “action” column.

[0005]

According to the above construction, the present invention provides a rotating body (14)
When the sheath pipe (17) is disposed between the muddy pipe receiving mechanism (35) and the connecting pipe mechanism (15a, 12), the sheath pipe (17) is connected to the muddy pipe receiving mechanism (35) and the connecting pipe mechanism (15a, 12). )
And when it is not arranged between the muddy pipe receiving mechanism (35) and the connecting pipe mechanism (15a, 12), the sheath pipe (17) and the first bypass flow path (70s) 2
Mud pipe receiving mechanism (3) through the bypass passage (70p)
5) and the connection pipe mechanism (15a, 12).

[0006]

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

As shown in FIG. 1, a tunnel 1 being constructed by the muddy water shield method is excavated and formed in a ground 3 which is a soft ground by a shield device 2 which is a shield machine whose cutting blade is formed in a disk shape. Since the tunnel 5 is still excavating from the direction of arrow B in FIG. 1 to the direction of arrow A in FIG. 1, the face 5 shown at the left end of FIG.
a is formed as a digging tip and is formed in a roll-over column shape capable of advancing in the direction of arrow A, and is supported by lining with segments or the like. In the invert 5b shown in the lower part of FIG. 1 of the tunnel 5, a hydraulic motor for supplying power to the shield device 2, a trailing bogie (not shown) equipped with back-filling equipment, substation equipment and the like are provided with the shield. In the form connected to the device 2, the rail is supported on a suitable temporary rail 6 so as to be able to travel, and the temporary rail 6 can be extended in the direction of arrow A in FIG. It extends in the directions of arrows A and B.

As shown in FIG. 1, a muddy water facility 7 is provided in the tunnel 5 so that the length of the cutting face 5a in the directions of arrows A and B can be extended along with the excavation. ,
A mud feed pipe line 70 formed in a mud feed pipe 7A in such a manner that muddy water 20 is pumped in the direction of arrow A in FIG. 1 to feed muddy water 20 from the upper part of FIG. A mixture of the muddy water 20 fed to 5a and the excavation waste is discharged from the lower part of FIG. 1 of the shield device 2 and debris is removed. Then, it is pumped in the direction of arrow B in FIG. Two pipe lines are provided, which are opposite to each other in the flow direction of the muddy water 20, with a drain pipe line (not shown) for discharging. In addition, since the muddy pipe 7A and the not-shown muddy pipe in the muddy water facility 7 are configured in a manner that the flow directions of the muddy water 20 are simply opposite to each other, and both are configured substantially in the same manner, in the embodiment described below, Mud pipe 7A
And the pipe extension device 10 as a mud feed pipe 70 formed by the pipe and a mud pipe extension apparatus for extending the pipe, a detailed description of the drain pipe and the drain pipe formed by the pipe will be described in detail. Illustration is omitted. The configuration of the mud pipe extension device for extending the mud pipe and the direction of disposing it in the tunnel 5 are substantially the same as those of the pipe extension device 10 described below. It has become.

That is, as shown in FIG.
A pipe extension device 10, which is a mud pipe extension device for extending the mud pipe 7A forming the mud pipe conduit 70, is already laid inside the pipe, that is, a mud pipe that is an existing mud pipe. 7
The muddy water 20 is housed in a form capable of receiving and supplying the muddy water 20 to the cutting blade side, that is, the cutting face 5a side of the shield device 2 via the pipe extension device 10 and the flexible pipe 11 connected thereto while accommodating the forefront portion of the A. The pipe extension device 1 is provided so as to be movable in the directions of arrows A and B, which are axial directions of the tunnel, in the tunnel 5.
On the right side in FIG. 1 which is the rear side shown in the direction of the arrow B of 0, a mud feed pipe 7A is already provided to connect the pipe extension device 10 and the wellhead 5c side. The mud feed pipe 7A is configured by connecting a single pipe 9 made of a steel pipe or the like as a single muddy pipe in series in the directions of arrows A and B in FIG. In the embodiment, each single pipe 9 as a muddy pipe has a predetermined pipe outer diameter D1 shown in FIG. 2 and a predetermined length L1 (FIG. 1) shown in FIG. For example, in the embodiment, L1 = 5.0 to 6.0 m). The plurality of single pipes 9 constituting the mud feed pipe 7A are already laid by being temporarily fixed so as not to move to the invert 5b or the like. As shown in FIG. 2, an open end 9a, which is the tip of the mud feed pipe 7A, is extended with a single pipe 9 'for extension through the open end 9a to the single pipe 9 at the head position. The mud 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 single pipe 9 constituting the mud feed pipe 7A and the single pipe 9 'for extension newly added to the pipe 9A are completely the same member, but in the embodiment, for convenience of explanation, these are used. The single pipes 9 and 9 'are given different symbols to distinguish them from each other.) On the other hand, a flexible resin pipe is provided on the front side of the pipe extension device 10 shown in the direction of arrow A in FIG. A flexible pipe 11 made of a pipe or the like is connected to the pipe extension device 10 and the shield device 2 so that a movable pipe 1 serving as a discharge port of the device 10 is connected.
2 is attached to the discharge port 12a shown on the arrow A side.

As shown in FIG. 1, the pipe extending device 10 has a pedestal-shaped frame 13 supported on the temporary rail 6 via wheels 131 and the like so as to be able to travel therethrough. 13, stator flanges 16 and 15, which are first and second rotating body support means, each of which is formed in a substantially disk shape, are provided in predetermined directions in arrows A and B directions which are front and rear directions in the tunnel construction direction. Are provided at intervals. Stator flange 16 as first rotating body support means
As shown in the lower right part of FIG. 2, a connecting cylinder 35 whose details will be described later is used as a mud pipe receiving mechanism that can receive the open end 9a, which is the tip of the existing mud pipe 7A, which is an existing mud pipe.
Is movable in the directions of the arrows A and B by a predetermined stroke L2 in a state where the mud feeding pipe 7A is inserted through the inside thereof.
That is, the mud feed pipe 7A is provided so as to be slidable along the axis thereof, while the stator flange 15 serving as the second rotating body support means is provided at the lower left portion in FIG. As described above, the joint cylinder 15a is located at a position facing the connection cylinder 35 provided on the stator flange 16 side.
The movable pipe 12 is provided as a connection pipe mechanism that can be connected to the shield device 2 so as to be slidably fitted in the directions of arrows A and B.

A rotating body 14 is provided between the stator flanges 16 and 15 in the directions indicated by arrows M and N in FIG. 1 around a rotation axis about an axis parallel to the tunnel axis (that is, an axis CT0 of a main shaft 21 described later). The rotatable member 14 is provided rotatably.
As shown in FIG. 3, one single pipe 9, that is, a laid mud feed pipe 7A, is set inside each of the pipes with the respective material axis directions directed in the directions of arrows A and B, which are the tunnel axis directions. It has a plurality of sheath pipes 17 in which a new single pipe 9 'for replenishment to be replenished can be accommodated, and four in the embodiment. The rotating body 14 has four sheath tube standby positions ST1, ST2,
As shown in FIG. 3, ST3 and ST4 are set in such a manner that their respective axes are arranged on the same circumference, and the four sheath tubes 17 are turned into respective sheath tubes by the rotation of the rotating body 14. Standby position S
It can be moved and positioned at each of T1, ST2, ST3 and ST4. Standing position ST for four sheath tubes
1, ST2, ST3, ST4, lower side of FIG. 2 or FIG.
As shown in FIG. 2, the sheath pipe standby position ST1 shown at the bottom includes the muddy pipe receiving mechanism formed by the connection cylinder 35, the movable pipe 12 and the joint cylinder 15.
a is arranged between the connecting pipe mechanisms formed thereby, so that each sheath pipe 17 of the rotating body 14 is selectively positioned between the muddy pipe receiving mechanism and the connecting pipe mechanism. It is in a form that can be done.

As shown in FIG. 2, each of the sheath pipes 17 of the rotating body 14 is slightly smaller than the length L1 of the single pipe 9, which is one muddy pipe constituting the mud feed pipe 7A. It is made of a steel pipe or the like having a length and an inner diameter slightly larger than the outer diameter D1 of the single pipe 9, and each of the sheath pipes 17 is formed so as to protrude at both ends in the directions of arrows A and B. Flange 17a,
The front and rear surfaces of 17a are respectively formed in a substantially disk shape and fixedly mounted on a pair of rotor flanges 18 and 19 arranged at predetermined intervals in the directions of arrows A and B, respectively. I have. In the rotor flanges 18 and 19, holes 18s and 19s for mounting the sheath tubes are provided by the number of the sheath tubes 17 provided in the rotating body 14, that is, in the embodiment, four holes A and B are respectively provided in the directions of arrows A and B. The rotor flanges 18 and 19 are formed through holes 18s and 19, respectively.
s and the inside 17s of each of the sheath tubes 17 are communicated with each other to support the four sheath tubes 17, and in this state, the stator flange 1
5 and 16 are rotatably fitted. Also, the rotating body 1
4, a main shaft 21 which is a drive shaft of the rotating body 14 is suspended and supported between the rotor flanges 18 and 19 in such a manner as to be located at the center of the four sheath tube standby positions ST1, ST2, ST3 and ST4. The main shaft 21 is provided so that the four sheath tubes 17 can be rotationally positioned at a pitch of 90 degrees in the embodiment. That is, a hydraulic motor 23 whose main body is fixedly supported by the frame 13 is attached to the main shaft 21.
The main shaft 21 is connected via a drive gear 22 so as to be rotatable by 90 degrees at a time.
The main shaft 21 is formed in a disk shape in which the two sheath tubes 17 are fitted and connected, and a support portion 251 shown in the lower portion of FIG. 1 is fitted and supported by a support ring 25 fixedly supported on the frame 13. By the operation of rotating by 90 degrees in the directions of arrows M and N around the axis CT0 via the hydraulic motor 23,
The four sheath tubes 17 are connected to the respective sheath tube standby positions ST1, ST2, S
A shape capable of moving and positioning between T3 and ST4, that is, the sheath pipe 17 is formed by a muddy water pipe receiving mechanism formed by the connection cylinder 35 and a movable pipe 12 formed by the movable pipe 12 fitted to the joint cylinder 15a. It has a shape that can be selectively positioned between the road mechanisms. Further, a support pipe 132 is provided above the four sheath tubes 17 of the rotating body 14 in FIG.
Are fixedly suspended between the stator flanges 15 and 16 by means such as bolting. Therefore, the main shaft 21 is connected to the rotor flanges 18 and 1 of the rotating body 14 as described above.
9 are rotated at a 90-degree pitch, so that the four sheath tubes 17 moved and positioned between the respective sheath tube standby positions ST1, ST2, ST3, and ST4 are positioned between the frame 13 and the support pipe 132. The material axis of the pipe 17 is 90 degrees in a circle with the axis CT0 of the spindle 21 as the center of rotation.
It rotates every time.

By the way, the four sheath tube standby positions ST
1, ST2, ST3, ST4, which is located at the lowest position in the pipe extension device 10 and is at the sheath tube standby position S shown in the lower side of FIG.
T1 is a sludge pipe line 70 in such a manner that the open end 9a, which is the tip of the sludge pipe 7A, can be arranged via the connection cylinder 35 in the inside 17s of the sheath pipe 17 located at the sheath pipe standby position ST1.
And the remaining sheath tube standby position ST
2, ST3, ST4 are the sheath tube standby positions ST2, ST
3. Each of the sheath tubes 17 arranged in ST4 and containing the single tube 9 'therein is a standby preparation position for sequentially moving to the sheath tube standby position ST1 later through the rotation of the main shaft 21. I have. As described above, a pair of the stator flanges 15 and 16 in the front-rear direction is provided on the front stator flange 15 in a form corresponding to the front and rear end positions of the sheath tube standby positions ST2, ST3 and ST4. One plug evacuation hole 15s and three cylinder mounting holes 16s are formed in the rear stator flange 16 so as to penetrate the respective stator flanges 15 and 16 in the directions of arrows A and B. In the pipe extension device 10, the sheath pipe standby position S
Each sheath tube 17 located at each of T2, ST3, ST4
A pair of plug mechanisms 26 and 27 each of which can open and close the inside 17s at both ends in the directions of arrows A and B, respectively.
The plug retreat hole 15s and the cylinder mounting hole 16s are provided in such a manner as to be capable of being opened and closed, respectively. In the embodiment, three each are provided, and the plug mechanisms 26 and 27 are new single pipes to be added to the mud feed pipe 7A. 9 'is configured to constitute a loading means capable of selectively loading each sheath tube 17 of the rotating body 14. On the other hand, the sheath tube 1 arranged at the sheath tube standby position ST1
7 has a shape in which both ends in the directions of arrows A and B are always open toward the movable pipe 12 and the connection cylinder 35;
Inside 17s of the sheath tube 17 located at the sheath tube standby position ST1
Has a connection cylinder 35 and a joint cylinder 15a
A part of the mud feeding pipe line 70 is always arranged in the inside 17 s of the sheath pipe 17 so that the main flow of mud water directly connected to the movable pipe 12 fitted to the pipe can flow therethrough.

In the pipe extension device 10, a mud feed pipe 70 disposed inside the sheath pipe 17 disposed at the sheath pipe standby position ST1 has a sheath pipe standby position ST2, ST3 in the pipe extension device 10. , ST4, bypass passages 70s, 70p which can communicate with the inside 17s of each sheath tube 17, that is, the inside of each single tube 9 housed therein, as shown in FIGS. Are formed 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 stator flange 16 on the rear side and the rotor flange 19 of the rotating body 14, respectively. A bypass flow passage 70 s disposed on the rear side as one bypass flow passage connects the connection cylinder 35 and the respective sheath tubes 17 located at the respective sheath tube standby positions ST2, ST3, ST4. On the other hand, a bypass flow path 70s arranged on the front side as a second bypass flow path connects the movable pipe 12 and each of the sheath pipes 17 located at each of the sheath pipe standby positions ST2, ST3, and ST4. Each is formed. Therefore, the sheath tube standby positions ST2, ST3,
As a loading means for opening and closing the front and rear of each sheath tube 17 located at each of ST4, the stator flange 1
The plug mechanisms 26 and 27 provided in the pipe tubes 5 and 16 pass the inside 17s of each of the sheath tubes 17 located at the respective sheath tube standby positions ST2, ST3 and ST4 to the bypass flow paths 70p and 70p.
s can be communicated with or separated from s.

That is, as shown in FIG. 4, a bypass passage 70s is formed between the rotor flange 18 and the stator flange 15 in the rotor flange 18 to which the front sides of the four sheath tubes 17 are connected. A groove 18a is formed on the front end face 18b of the rotor flange 18 at the front end face indicated by the arrow A so as to be continuous in the circumferential direction along the arrangement direction of the sheath tube standby positions ST1, ST2, ST3, and ST4. The hole 18s of the rotor flange 18 is formed in the groove 18s of the rotor flange 18 so that the inside 17s of each of the sheath tubes 17 connected and mounted thereto can communicate with the bypass flow passage 70s. As described in the above, it is disposed so as to penetrate in the directions of arrows A and B. Then, the sheath tube standby position ST2,
As shown in FIG. 2 or FIG. 4, each of the plug mechanisms 26 provided on the front side of each of ST3 and ST4 has a plug 29 which is a valve body that can open and close each hole 18s of the rotor flange 18. Can be driven backward and backward by a plug opening / closing cylinder 30 provided on the side of the plug mechanism 26 in the direction of arrow A in the directions of arrows A and B which are the tunnel axis directions by the stroke length L2 of the opening / closing cylinder 30. It is provided in. Accordingly, the respective plug mechanisms 26 move the respective plugs 29 in the respective sheath tube standby positions ST2, ST3, ST4 by the operation of the plug 29 projecting and retracting in the directions of arrows A and B via the plug opening / closing cylinder 30. Inside 17s of the mud feed pipe 70
s so that they can be isolated from or communicate with them.

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

On the other hand, the bypass passage 70p is provided between the rotating body 14 and the stator flange 16 on the rear side.
4. Rotor flange 1 supporting the rear side of four sheath tubes 17
9 and the stator flange 16 are arranged and formed here in a shape corresponding to the space 40 portion. The bypass flow passage 70p is connected to the rotor cylinder 19, that is, By retracting in the direction of arrow B, the connection cylinder 35 communicates with the interior 17s of the sheath tube 17 via the space 40, and is freely communicable with the mud feed pipe 70. Then, the plug mechanism 27 provided to open and close the rear side of each of the sheath tubes 17 arranged at the sheath tube standby positions ST2, ST3, and ST4 has a loading port 33 in the sheath tube 17 as described later. Is opened toward the tunnel 5, and the inside 1 of the sheath tube 17 is formed therefrom.
7s, a loading means for selectively loading a new single pipe 9 'is formed, and at the same time, the sheath pipe standby positions ST2, S
It is a plug means for opening and closing the inside 17s of the sheath tube 17 disposed at T3 and ST4 with respect to the bypass flow path 70p.

That is, as shown in FIG. 2, the plug mechanism 27 has an opening / closing cylinder 32 formed in a cylindrical shape as a valve body capable of opening and closing the rear side of the sheath tube 17. The cylinder mounting hole 16 of the stator flange 16 is formed so as to protrude and retreat in the directions of arrows A and B with respect to the stator flange 16 by a stroke length L2 substantially equal to the stroke length L2 of the plug opening / closing cylinder 30.
s. Inside the opening / closing cylinder 32, a cap plug 31 which is a plug body formed in a roll-over inner hollow cylindrical shape is provided with a grip portion 3 formed on the right end side in FIG.
11 can be pulled out from the opening / closing cylinder 32 by pulling the cap plug 31 in the direction of arrow B.
Of the sheath tube 17 located at the sheath tube standby positions ST2, ST3, ST4 via the opening / closing cylinder 32 from which
7s is provided detachably so as to be able to communicate with the tunnel 5 which is the outside. Therefore, the plug mechanism 27 is composed of an opening / closing cylinder 32 serving as a valve body and a cap plug 31 serving as a plug body detachably fitted to the opening / closing cylinder 32. The rotor flange 1 corresponding to each of the sheath tube standby positions ST2, ST3 and ST4 is provided.
9 and the cylinder mounting hole 16s of the stator flange 16 can be closed and opened.
Depending on the state of attachment / detachment, it is possible to freely select whether the inside 17s of the sheath tube 17 provided with the plug mechanism 27 is communicated with the bypass passage 70p, communicated with the outside tunnel 5, or shielded. Is configured to obtain.

The cap plug 31 mounting area inside the opening / closing cylinder 32 fitted in the cylinder mounting hole 16s of the stator flange 16 is located at the sheath tube standby positions ST2, ST
3. A new single tube 9 'is added to each sheath tube 17 arranged in ST4.
Therefore, the cap plug 31 serves as an opening / closing stopper for the loading port 33, that is, a plug for closing the loading port 33, which is a space for communicating the inside 17s of the sheath tube 17 to the outside. It is a form that constitutes. Further, a seal rubber 321 equivalent to the seal rubber 293 mounted on the protruding tip side of the plug 29 is annularly fitted on the outer periphery of the opening / closing cylinder 32 at the end of the opening / closing cylinder 32 in the direction of arrow A. It is fitted together,
The opening / closing cylinder 32 moves the seal rubber 321 to the rotor flange 19 by the movement of the opening / closing cylinder 32 in the directions of arrows A and B.
The opening / closing cylinder 32 can be connected to and separated from the rotor flange 19 in such a manner that the opening / closing cylinder 32 is connected to the outer peripheral portion of the hole 19 s or to the outer peripheral portion of the mounting region of the opening / closing cylinder 32 in the stator flange 16.

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

Further, in the pipe extension device 10, the pipe extension apparatus 10 is arranged on the arrow B direction side, which is behind the sheath pipe standby position ST1.
The connecting cylinder 35 for receiving the single pipe 9 at the foremost position of the laid muddy water pipe 7A into the pipe extension device 10 has a stroke length L2 corresponding to the stroke length L2 of the plug 29, the opening / closing cylinder 32, and the movable pipe 12. However, it is provided in a cylindrical shape with a step so as to be able to protrude and retreat in the directions of arrows A and B with respect to the stator flange 15, and is inserted through the connection cylinder 35 near the rear end of the connection cylinder 35. Pipe seals 36 each formed of an annular flexible material for sealing between the outer circumference of the single pipe 9 received in the pipe extension device 10 in the form shown in FIG. A plurality is provided side by side. A seal rubber 293 attached to the protruding front end of the plug 29 is provided at the protruding front end of the connection cylinder 35 at the arrow A side.
A seal rubber 351 equivalent to the seal rubber 321 mounted on the protruding tip side of the opening / closing cylinder 32 is mounted in an annular shape along the front edge of the connection cylinder 35, and the connection cylinder 35 is indicated by arrows A and B. The seal rubber 351 is connected to the outer peripheral portion of the hole 19 s formed in the rotor flange 19 by the operation of moving in the direction, or is connected to the inner peripheral surface of the stator flange 16 through the connection cylinder 35 penetrating portion. The cylinder 35 can be connected to and separated from the rotor flange 19.

As shown in FIG. 2, a hydraulic clamp 37 whose main body is fixedly supported on the frame 13 is provided on the rear side of the connecting cylinder 35 in the direction of arrow B, as shown in FIG. Through the 37 grips 37a,
The pipe extension device 10 is provided so as to be able to grip the outer peripheral portion of the single pipe 9 inserted into the connection cylinder 35.
The rotor flange 19 on the rear side of the four sheath tubes 17
A cleaning mechanism 39 formed between the stator flange 16 and the space 40 used as the bypass passage 70p and capable of cleaning the space 40 supplies water into the space 40 from a water absorption port 391 provided at the upper right portion of FIG. Figure 2
It is provided in such a manner that it can be discharged from a drain port 392 provided at the lower right. The space 40 is moved by the connecting cylinder 35 in the directions of arrows A and B,
5 is formed inside the single pipe 9 inserted into the connection cylinder 35 via the seal rubber 351 or the like during the mud feeding operation shown in FIG. The bypass passage 70p formed in the mud feeding pipe line 70 and the space 40 is in a shut off state.

Further, an appropriate seal packing is provided between each member constituting the pipe extension device 10 and the rotor flange 1.
8, 19 and the four sheath tubes 17 fixed thereto, the rotation of the plug mechanisms 26 and 27, the movable tube 12 and the connecting cylinder 35, the reciprocating operation, and the frame 13 of the tube extension device 10. The muddy water pipe 7 of the muddy water facility 7 is connected to a plurality of connected single pipes 9 constituting the already laid muddy pipe 7A. As shown in FIG. 2, the single tube 9 inserted into the connection cylinder 35 while being held by the holding portion 37a of the hydraulic clamp 37, and is connected to the single tube 9 at the sheath tube standby position ST1 as shown in FIG. Is located at the forefront position of the single tube 9 disposed in the inside 17s of the sheath tube 17 or the new single tube 9 'to be connected here, or is located at the sheath tube standby position ST1. Through the inner 17s of the sheath tube 17 itself The movable pipe 12 is discharged into the extension device 10 and selectively communicates with the bypass passages 70p and 70s, passes through the inside of the movable pipe 12 fitted to the joint cylinder 15a, and opens the left side of the movable pipe 12 in FIG. It is sent to the flexible pipe 11 from the discharge port 12a, which is the end, to the shield device 2, that is, the face 5 from the wellhead 5c side.
The muddy water 20 can be supplied to the a side.

When muddy water is supplied by the pipe extension device 10, one single pipe 9 is disposed in the sheath pipe 17 located at the sheath pipe standby position ST1, and the muddy water 20 is supplied through the single pipe 9. In some cases, the supply is performed, and in some cases, the sheath pipe 17 itself forms the mud feed pipe 70.
As shown in FIG. 7, the joint between the pair of single tubes 9, 9 which are in a non-connected state in the inside of the tube 0 and are connected to each other is connected to the connection cylinder 35 and the sheath located at the sheath tube standby position ST <b> 1. It is located between the tubes 17. A female joint portion 91 is formed at the joint between each single tube 9 and another adjacent single tube 9 at the end in the direction of arrow B of the single tube 9 over the entire inner circumference. The engagement groove 91a is formed in the 91. On the other hand, a male joint portion 92 is formed at the end of each single tube 9 in the direction of arrow A over the entire outer circumference, and the male joint portion 92 has an engaging protrusion 92a, and the engaging groove of the female joint portion 91. It is formed in an annular shape so as to be able to engage with 91a. The engagement protrusion 92a is provided in the muddy water pipe 7
7 is a shape which can be expanded and contracted in the directions of arrows G and H in FIG. The ring-shaped member, which can be reduced in diameter to the above diameter, is fastened to the male joint 92 in a state of being urged to the outer side in the direction of arrow G in the radial direction via an appropriate spring means. And a single pipe 9 adjacent in the directions of arrows A and B,
Reference numeral 9 denotes a form in which the male joint 92 is pushed into the female joint 91 so that one can be joined to the other with one touch as shown in FIG. Appropriate O-rings, seals and the like are disposed between the female joint portion 91 and the joints of the single pipes 9 to be joined are sealed. The female joint 91 has a pin insertion hole (not shown) for inserting a pin for reducing the diameter of the engagement protrusion 92 provided on the male joint 92 toward the arrow H side, which is radially inward. The single tubes 9, 9, which are formed by drilling and joined as described above, are configured so that their engagement can be released by inserting an engagement release pin into the pin insertion hole.

Since the tunnel 1 and the shield device 2 for constructing the tunnel 1 have the above-described configuration, in order to construct the tunnel 1, the cutting blade portion of the shield device 2 is rotated to drive the ground 3 In the form of a circular cross section,
The segments 5 are sequentially erected and lined from the inside of the shield device 2 to the rear thereof, so that the tunnel 5
It is formed so as to advance from the direction side toward the direction A side. In this way, when the tunnel 5 is to be formed by cutting the ground 3, the face 5a is in an unstable state because it has been disturbed by the shield cutting blade and has not yet been segment-lined, and has lost its sludge. And it will collapse. Therefore, when the ground 3 is excavated, the muddy water 20 is pressurized and fed from the inside of the partition wall of the shield device 2 to the cutting blade through the mud feed pipe 70 of the muddy water facility 7 to secure the stability of the face 5a. And excavation work. In addition, the shear formed by the shield cutting blade excavating the ground 3 is mixed with the muddy water 20 fed under pressure by the mud feed pipe 70 as described above, and this is mixed with the debris removal device of the shield device 2. After being removed through the drainage pipe (not shown) configured in the same manner as the mud feed pipe 70, it is carried out of the tunnel 5 in the form of draining in the direction of arrow B, The shield is rapidly removed from the face 5a, and the shield cutting blade is always smoothly rotated at the face 5a.

Therefore, during the excavation work of the cutting face 5a by rotating the shield cutting blade, it enters the pipe extension device 10 from the rear side in a form received through the connection cylinder 35, and the top position of the mud feed pipe 7A is reached. As shown in FIG. 9, the open end 9a of the single tube 9 arranged at the left end portion POS1 in FIG. 9 of the front end portion of the sheath tube 17 located at the sheath tube standby position ST1 shown in FIG. Position it in the form to be arranged.
In this state, in order to supply the muddy water 20 to the shield device 2 via the mud line 70, the rearmost ends of the single tubes 9 constituting the mud pipe 7A from the wellhead 5c (the end on the arrow B side). The muddy water 20 is supplied to the section A), and the muddy water 20 is pumped in a direction of an arrow A at a predetermined pressure through a pumping pump facility (not shown) or the like. Then, the muddy water 20 supplied to the mud pipe 7A from the wellhead 5c passes through the mud pipe 70, and as shown in FIG. 9, the open end of the single pipe 9 at the foremost position of the mud pipe 7A. It is discharged from 9a into the pipe extension device 10, and is discharged into the flexible pipe 11 from the discharge port 12a shown at the left end of FIG. Then, the muddy water 20 discharged into the flexible pipe 11 is supplied under pressure to the upper part of the inside of the partition wall of the shield device 2 and the like, and the stability of the face 5a is maintained. In addition, since the waste formed by the cutting face 5a is mixed with the muddy water 20 supplied to the cutting face 5a and discharged to the wellhead 5c through the drainage pipe as described above, the distribution of the muddy pipe 7A and the muddy water 20 is performed. The inside of the drain pipe is pressure-fed in the direction of arrow B through the drain pipe whose direction is reversed,
c, etc. to the outside of the tunnel 5.

The muddy water 2 is thus supplied by the mud pipe 7A.
When feeding 0 to the face 5a, the pipe extension device 10 uses the sheath pipe standby positions ST2, ST3, ST shown in the upper part of FIG.
In the sheath pipe 17 disposed in the fourth, a new single pipe 9 'to be added to the single pipe 9 constituting the foremost position of the mud feed pipe 7A is housed in each of them. ,
Alternatively, a loading operation for housing the sheath tube 17 is being performed. For this reason, the sheath tube standby positions ST2, S
The plug mechanism 26, 27, which is an opening / closing mechanism before and after each sheath tube 17 disposed at T3, ST4, is in an open / closed state, for example, on the plug mechanism 26 side, in a closed state shown in FIG. Any of the open states shown is shown. At this time, the pipe extension device 10
Since each of the sheath tubes 17 is configured to be arbitrarily closed before and after each via the tubes 6 and 27, only the sheath tube 17 for which the above-described operation of loading the single tube 9 'is already performed. The sheath tube 17 containing the tube 9 ′ and the sheath tube 1 located at the sheath tube standby position ST1 serving as the muddy conduit 70.
In a state in which it is pressure-isolated with respect to 7 (that is, the state shown in the upper part of FIG. 5), the loading operation is performed here. Position S
The muddy water 2 is in a state of being in communication with the single pipe 9 in the sheath pipe 17 arranged at T1 (that is, a communication state of the bypass 70s and 70p).
The mud feeding operation can be performed without leaking the O. 0 out of the pipe extension device 10. Therefore, in this state, the plug mechanism 2
6 and 27 are the sheath tube standby positions ST2 and S in the retracted and open state.
Inside the single pipe 9 ′ housed in each of the sheath pipes 17 located at T3 and ST4, the muddy water 20 in the mud feed pipe 7A is passed through bypass pipes 70p and 70s formed in the pipe extension device 10.
Each of the single tubes 9 ′ already accommodated in the sheath tube 17 that has not been loaded is filled with the muddy water 20 at a predetermined pressure in such a manner as to flow into the respective single tubes 9 ′.

By the way, if the shield device 2 advances in the direction of arrow A by excavating the cutting face 5a, the temporary rail 6 is extended in the direction of arrow A so as to follow the same without delay. The trailing bogie of the shield device 2 needs to be advanced, and the mud feed pipe 70 of the muddy water facility 7 has to be extended in the direction of arrow A together with the mud drain pipe.
In order to extend the mud feeding pipe line 70 in the direction of arrow A, a pipe extending device 10 is used to extend the mud feeding pipe 7A by adding a single pipe 9 'for extension to the single pipe 9 at the forefront position. Then, pipe extension work is performed. In addition, since the shield device 2 can be advanced to some extent by deforming the flexible pipe 11 without extending the mud feed pipe 7A, the length of the shield device 2 corresponds to the length L1 of one single pipe 9 only. When the vehicle is advanced in the direction of arrow A, the extension of the mud feed pipe 7A is performed.

A method of extending the mud pipe 7A will be described below with reference to FIGS. 9 to 11.
At 0, for convenience of explanation, the sheath tube standby position ST1 is set at the lower side in these figures, while the sheath tube standby position ST2 is set at the upper part of the sheath tube standby position ST1. Once set, the sheath tube standby positions ST1, S
It is assumed that T2 is disposed at a position 90 degrees from the axis of the spindle. Now, during the excavation work of the face 5a (that is, during mud feeding), as described above, the open end 9a of the single pipe 9 constituting the foremost part of the mud feeding pipe 7A is as shown in FIG. The sheath tube 17 located at the sheath tube standby position ST1 is located at the position of the left end arrow POS1 in FIG. 9, and from this state, the frame 13 is firstly moved to the single tube 9 via the temporary rail 6.
Is moved forward in the direction of the arrow A by the length corresponding to the length L1. During the movement operation of the frame 13, if the hydraulic clamp 37 is released as shown in FIG. 10, the frame 13 is laid so that the single pipe 9 inserted through the connection cylinder 35 passes through the inside of the grip 37a. Used mud pipe 7A
To move forward easily. Then, the single tube 9 in the sheath tube 17 located at the sheath tube standby position ST1 due to the forward movement operation of the frame 13, as shown in FIG.
, The opening end 9a of the single tube 9 retracts to the POS2 position on the rear side of the sheath tube 17 disposed at the sheath tube standby position ST1. Note that the reason that the single pipe 9 constituting the foremost part of the mud feed pipe 7A moves in the direction of arrow B with respect to the sheath pipe 17 is relative to the forward movement of the frame 13, and Pipe extension device 1 for the already installed mud pipe 7A
The portion arranged on the rear side of 0 is temporarily fixed to the invert 5b or the like as described above, and does not move at all. In this way, the open end 9a of the mud pipe 7A is
When retracted to the two positions, a single extension pipe 9 'is added to the lower end of the sheath tube standby position ST1 in FIG. The resulting void SP is generated. Therefore, a new single pipe 9 'is loaded into the gap SP formed at the sheath pipe standby position ST1, and this is connected to the single pipe 9 whose open end 9a is retracted to the POS2 position to perform pipe extension work. Do, but actually single tube 9, 9 '
Until the connection is made, that is, as shown in FIG. 10, the gap SP is formed in the sheath tube 17 disposed at the sheath tube standby position ST1 and the muddy water 20 is not formed here even while the single tube 9 is present. However, the mud is not interrupted in such a manner that it passes through the inside 17s of the sheath tube 17 itself arranged at the sheath tube standby position ST1. That is, the single pipe 9 sent to the rear side of the pipe extension device 10 by the forward movement of the frame 13
5 between the inner peripheral surface of the connecting cylinder 35 and the outer peripheral portion of the single pipe 9 in the front-rear direction by a pipe seal 36 provided at the rear of the muddy water 20.
Is prevented from leaking out of the pipe extension device 10, so that the muddy water 20 can continue to be fed without the muddy water 20 leaking even while the frame 13 is moving forward.

Therefore, the single tube 9 disposed in the sheath tube 17 at the sheath tube standby position ST1 by moving the frame 13 forward.
When the open end 9a of the plug mechanism 26 is retracted to the POS2 position as shown in FIG.
9. The opening and closing cylinder 32, the movable pipe 12 and the connection cylinder 35 of each plug mechanism 27 are respectively driven backward as shown in FIG. , Together with the movable pipe 12 and the connecting cylinder 35, are cut off from the front and rear rotor flanges 18 and 19, respectively.
9, 32, 12, and 35 are connected and retracted to the stator flanges 15 and 16 side. The plug 29, the opening / closing cylinder 3
2. The movable pipe 12 and the connection cylinder 35 are provided with seal rubbers 293, 321,
In the retracted state shown in FIG. 10, the plug retreat hole 15s of the stator flange 15 or the joint cylinder 15a, or the stator flange 1
6 from the cylinder mounting hole 16s or the front end of the connection cylinder 35, which is in a state of being water-tightly connected to each inner peripheral portion. And the muddy water 20 does not leak into the tunnel 5 from the pipe extension device 10.

Thus, the plug 29, the opening / closing cylinder 32
Together with the movable pipe 12 and the connecting cylinder 35 in FIG.
0, the front and rear rotor flanges 18,
When cut off from the rotor 19, the rotor 14 composed of the rotor flanges 18, 19 and the four sheath tubes 17 suspended between them is released in a rotatable manner with respect to the stator flanges 15, 16. You. At the same time, between the rotating body 14 and the front and rear stator flanges 15 and 16, respectively,
The bypass flow paths 70 s and 70 p are connected to the bypass flow path 70 p from the opening end of the connection cylinder 35 to the sheath pipe standby position ST2, ST3, ST4 via the space 40 from the open end of the connection cylinder 35. The bypass flow path 70s is connected to the interior 17s of the sheath tube 17 arranged at the standby position ST2, ST3, ST4 of the sheath tube so as to be connected to the interior 17s of the sheath tube 17 arranged therein. It is formed separately from the mud feed pipe 70 which is the main stream of the mud feed water, in communication with the mud feed pipe 70 inside the movable pipe 12 thus formed. In this state, the hydraulic motor 23 and the driving gear 22
By rotating the main shaft 21 by a predetermined amount of rotational drive via the rotary shaft 14, the rotating body 14 is rotated by, for example, 90 degrees in the arrow M direction (or N direction) around the axis CT0 of the main shaft 21 as the center of rotation. As described above, in FIGS. 9 and 10, the sheath tube standby position ST2 is at a position 90 degrees with respect to the sheath tube standby position ST2 shown at the top of these figures.
1 is located. Therefore, when the rotating body 14 is rotated by 90 degrees in the direction of arrow M via the main shaft 21 in this manner, the four sheath tubes 17 are moved by 90 degrees at a time, and are positioned there. 9, the single tube 9 is retracted from the inside so that the open end 9a is located at the rear POS2 position by the forward movement of the frame 13 (in the state shown in FIG. 9). As shown in FIG. 3, the sheath tube 17 is in the sheath tube standby position ST1.
Tube standby position ST4 located on the side of arrow M direction 90 degrees from
Then, it moves to the portion not shown in FIG.
At the same time, in the sheath tube standby area ST1 in which the gap SP has been formed by the retreat of the single tube 9, the sheath tube standby position ST2 (in the state shown in FIG. 9) is previously disposed (in the state shown in FIG. 9).
The sheath tube 17 in which one single tube 9 'is housed is arranged in s,
As a result, a new single pipe 9 ′ is arranged in series in the gap ST with its material axis aligned with the material axis of the single pipe 9 constituting the head portion of the muddy water pipe 7 </ b> A. . Although the new single pipe 9 'is not yet connected to the single pipe 9 constituting the foremost part of the muddy water pipe 7A, the plug 29, the opening and closing cylinder, 3
2. When the connecting cylinder 35 is retracted, the plug 29 and the opening / closing cylinder 32 are closed in the single pipe 9 'accommodated in the interior 17s of each of the sheath pipes 17 closed by a mud feed pipe 70.
The muddy water 20 in the mud feed pipe 70 flows into the single pipe 9 ′ at a pressure substantially equal to that of the mud feed pipe 70 through the bypass flow paths 70 s and 70 p communicating with the mud feed pipe 70. However, inside the new single tube 9 ′ in the sheath tube 17 that is now newly arranged at the sheath tube standby position ST 1, before the rotational movement to the sheath tube standby position ST 1 and during the rotation operation. The muddy water 20 having a predetermined pressure substantially equal to that of the mud feed pipe 70 is circulated. That is, during the rotating operation of the rotating body 14, the sheath pipes 17 of the rotating body 14 move to the adjacent 90 ° standby position of the sheath pipes in such a manner that their positions are interchanged. For this reason, during the rotation operation of the rotating body 14, the sheath pipe 17 is placed between the connecting cylinder 35 and the movable pipe 12 at the sheath pipe standby position ST1, which is used as the mud feeding pipe line 70 at times other than the rotation operation. Appears, but at this time, the laid mud pipe 7A
The muddy water 20 discharged into the pipe extension device 10 at the POS2 position in FIG. 10 passes through the inside 17s of each of the sheath pipes 17 through the bypass flow passages 70p and through the bypass flow passages 70s as shown in FIG. Thus, the state in which the fluid flows at a predetermined pressure while being fed to the movable pipe 12 side is maintained. Therefore, even when the sheath tube 17 rotates through the main shaft 21 and when the new single tube 9 ′ in the sheath tube 17 is still in a disconnected state with the single tube 9 of the laid muddy water pipe 7 </ b> A, it is movable. Tube 1
The discharge pressure of the muddy water 20 discharged from the second discharge port 12a to the flexible pipe 11 does not drop, and the mud can be continuously sent in a predetermined state.

When a new single tube 9 'is placed at the sheath tube standby position ST1, the open end 9a is retracted to the POS2 position as described above, and the new single tube 9' to be joined to the single tube 9 'is opened. As shown in FIG. 7, the male joint portion 92 of the single tube 9 is connected to the new single tube 9 ′ at the POS 2 position where the open end 9 a of the single tube 9 is retracted. The shape is opposite to the female joint portion 91. In this state, as shown in FIG. 11, first, the hydraulic clamp 37 is driven, and the outer peripheral portion of the already laid single pipe 9 is gripped by the grip portion 37a. In this manner, when the movable pipe 12 is driven to protrude in the direction of the arrow B, the movable pipe 12 is in its most protruded state, in the sheath tube standby position ST.
The female joint part 91 of the new single pipe 9 ′ is fitted to the male joint part 92 of the single pipe 9 in such a manner that the new single pipe 9 ′ arranged at 1 is pushed in the direction of arrow B. That is, as shown in FIGS. 7 and 8, the new single tube 9 ′ is engaged with the engagement protrusion 92 a on the single tube 9 via the inner peripheral surface of the female joint portion 91.
Is temporarily reduced in the direction of arrow H, which is the inner side in the radial direction, and the single tube 9 ′ moves in the direction of arrow B,
When the engagement protrusion 92a and the engagement groove 91a are arranged and aligned, the once reduced engagement protrusion 92a is replaced with the engagement protrusion 92a.
The engagement groove 9 on the single pipe 9 ′ side through the spring force given to itself
In 1a, the male joint 92 and the female joint 91 are engaged with each other in such a manner that the diameter increases in the direction of the arrow G which is radially outward. As a result, the single pipes 9 and 9 'are joined with one touch without any trouble such as bolting, that is, one new single pipe 9' is added to the single pipe 9 constituting the foremost part of the mud feed pipe 7A. The mud feed pipe 7A is connected to a single pipe 9 having a length L.
The frame 13 is extended by a length corresponding to 1 (that is, by a length statement corresponding to the amount of forward movement of the frame 13). The single tubes 9, 9 'once joined via the joint portions 91, 92 are firmly engaged so that they cannot be disengaged unless the disengagement pins or the like are inserted into the pin insertion holes. Are combined. In addition, a male joint 92 and a female joint 9 are provided between the single tubes 9 adjacent in the directions of arrows A and B.
By providing an O-ring or the like between the
The mud feed pipe 70 is continuously formed in the directions of arrows A and B in such a manner that the muddy water 20 cannot leak from between the single pipes 9 and 9 '. During the joining operation of the single pipes 9 and 9 'performed in this manner, the operation of sending the muddy water 20 is continued. In this way, the end of the newly joined single pipe 9 ′, which is the open end on the non-joint side, in the direction of arrow A becomes the new open end 9 a in the muddy water pipe 7 A, and the open end 9 a is again shown in FIG. Sheath tube standby position ST shown in
The mud feeding is continued in the form of being placed at the POS1 position.

On the other hand, as described above, in the state shown in FIG.
Of the sheath tube standby position ST shown in FIG.
The sheath tube 17 that has moved to 4 is in a state in which the single tube 9 is not yet housed inside the sheath tube 17. Therefore, in the pipe extension device 10, the sheath pipe standby positions ST2, ST
3. In any one of ST4 and ST4, by pulling out the cap plug 31 as the plug body from the opening / closing cylinder 32 as the valve body, the loading port 33 is formed, and the empty sheath tube 17 is connected to the empty sheath pipe 17 through the loading port 33. New single tubes 9 'are sequentially loaded.
For this reason, the pipe extension device 10 can be moved forward in the tunnel 5 following the frame 13 of the pipe extension device 10 so as to be disposed on the arrow B direction side, which is the rear side of the pipe extension device 10. The single tube supply means is connected to the sheath tube standby positions ST2, ST3, S
A new single pipe 9 ′ is loaded in the empty sheath pipe 17 sequentially through the single pipe supply means by preparing it at the rear side in a form aligned with any of the cap plugs 31 of T4. The single tube 9 'is stored in all the sheath tubes 17 as quickly as possible. Thus, even if the supply of the new single pipe 9 for extending the mud feed pipe 7A is interrupted due to, for example, any situation that may occur during the construction process, the pipe extension apparatus 10 is capable of supplying the new pipe 9 to the pipe extension apparatus 10. At least four single pipes 9 minutes accommodated in the sheath pipe 17 extend the mud feed pipe 7A without delay, that is, the mud feed is stopped during that time, which hinders the excavation work of the face 5a. Coming is avoided.

In order to load a new single tube 9 ′ into the empty sheath tube 17, first, as shown in FIG.
For example, in FIG. 11, the plug mechanism 26 on the arrow A direction side which is the front side of the sheath tube standby position ST4 in FIG. The sealed rubber 293 is made to protrude until it comes into contact with the front end (the end on the arrow A side) of the sheath tube 17 at the bottom of the hole 18s of the front rotor flange 18 and closes the hole 18s via the protruding plug 29. Then, the left end of the sheath tube 17 arranged at the sheath tube standby position ST4 in FIG. 11 is closed. At this time, the plug 29 is protruded so 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, whereby the plug 29 moves the inside 17 s of the sheath tube 17 arranged at the sheath tube standby position ST4 from the bypass flow passage 70 s 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 protrude in the direction of arrow A, and the sealing rubber 321 fitted to the protruding tip is connected to the outer peripheral surface of the hole 19 s of the rear rotor flange 19. Thereby, the hole 19 s of the rotor flange 19 and the cylinder mounting hole 16 s of the stator flange 16 are connected to the opening / closing cylinder 32 and the cap plug 31 fitted inside thereof.
The interior 17s of the sheath tube 17 which is now closed at the sheath tube standby value ST4 has a bypass passage 70p formed between the rotor flange 19 and the stator flange 16, or It is cut off from the tunnel 5 outside the pipe extension device 10. That is, the inside 17s of the sheath tube 17 arranged at the sheath tube standby position ST4 has an external portion other than the inside 17s due to the protruding arrangement of the plug 29 and the opening / closing cylinder 32 with the cap plug 31 fitted therein. It is in a form that is shielded and isolated from.

In this state, the inside of the sheath tube 17 arranged at the sheath tube standby position ST4 is first placed in the sheath tube standby position ST1.
Is used as a part of the mud line 70, so that the mud 20 is still in the inside 17s of the sheath tube 17 at a pressure substantially equal to the mud pressure of the mud line 70. It is in a filled state. Therefore, plug 29
In the sheath tube 17 which is closed through the inside and the pressure mud is filled in the inside 17s, the sheath mud is discharged and depressurized through the overflow port 291 of the muddy water collecting mechanism 28 provided in the plug mechanism 26 in the closed state. Then, the pressure in the inside 17s of the sheath tube 17 is released, and the muddy water 20 filled therein is once drawn into the tank 281 and collected.
In this manner, when the cap plug 31 is pulled out of the opening / closing cylinder 32 in a form in which the grip portion 311 is pulled in the direction of arrow B, which is the rear side of the pipe extension device 10, the sheath disposed at the sheath tube 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 extracting the cap plug 31, is connected to a tunnel 5 in which the inside 17 s of the sheath pipe 17 is outside the pipe extension device 10. And formed here in communication with the Therefore, from the loading port 33 formed in this way, it is arranged at the sheath tube standby position ST4 via the above-described single tube supply means and the like, and the interior 17s
Loads a new single tube 9 ′ into the empty sheath tube 17 from the rear side. Then, the cap plug 31 is loaded and fitted inside the opening / closing cylinder 32. In this state, the air in the single tube 9 ′, which has been newly loaded and refilled into the sheath tube 17, is now discharged from the plug 2
9 using the overflow port 291, the water supply / drainage port 292, etc.
The muddy water 20 stored in 1 is returned to the single pipe 9 ′,
Replace with muddy water 20 at a predetermined pressure.

In this manner, the sheath tube 17 which has been arranged at the sheath tube standby position ST4, that is, the sheath tube 17 which has been previously arranged (in the state shown in FIG. 9) at the sheath tube standby position ST1 and which has the opening end 9a The single tube 9 is retracted from the inside so as to be arranged at the POS2 position on the rear side, and the sheath tube 17 whose interior 17s has been emptied is refilled with a new single tube 9 ′. The inside of the single pipe 9 'is prepared to be filled with muddy water 20 at a predetermined pressure. So, thus,
For example, at the sheath tube standby position ST4, in order to refill the empty sheath tube 17 with a new single tube 9 ', the projecting arrangement of the plug 29 and the opening / closing cylinder 32 causes the sheath tube standby position ST4 to be filled.
4 and the inside 17s of the sheath pipe 17 is placed in the
In addition, the refilling operation of the new single pipe 9 'can be performed in a state where the refilling operation is separated from the bypass flow passages 70s and 70p. Mud feeding can be continued without lowering the pressure of the muddy water 20 discharged into the pipe 11. In this way, the plug mechanism 26 is opened by driving the plug 29 corresponding to the sheath tube 17 at the sheath tube standby position ST4 in which the new single tube 9 'is refilled and loaded in the inside 17s again in the direction of arrow A. Then, the plug 29 is retracted into the plug retreat hole 15 s of the stator flange 15,
Through the hole 18s from which the plug 29 has come out from the hole 18s side of the rotor flange 18, the sheath tube standby position ST is again returned.
The inside 17s of the fourth sheath tube 17 communicates with the bypass channel 70s. Similarly, when the opening / closing cylinder 32 and the connecting cylinder 35 are respectively retracted, the inside 1
7s also communicates with the bypass flow path 70p. As a result, the inside of the single tube 9 ′ newly refilled into the sheath tube 17 is in communication with the bypass passages 70 p and 70 s. At this time, the single tube 9 ′ with the plug 29 opened is now opened. Since the muddy water 20 is already filled at a predetermined pressure from the tank 281 via the muddy water collecting mechanism 28, the connecting pipe mechanism of the pipe extension device 10 is opened even when the plug 29 is opened. The mud water 20 is always sent through the mud line 70 in a stable state without the danger of pressure drop of the mud water discharged from the movable pipe 12. In addition, pipe extension device 1
0, the space between the rotating body 14 used as the bypass passages 70s and 70p and the stator flange 15 or 16 can be cleaned in a flushing manner via the cleaning mechanism 39 provided in the space 40, so that the pipe extension can be performed. The device 10 is kept in a good condition in which its watertightness is always kept good and the clogging of the muddy water 20 does not occur.
Can be used for a long time.

Thus, the sheath tube standby positions ST2, ST3,
The single pipes 9 'are respectively accommodated in the insides 17s of the respective sheath pipes 17 arranged in the ST4, and the mud feed pipes 70 are provided in the respective single pipes 9' via the bypass flow paths 70p and 70s.
By allowing the muddy water 20 to flow at a pressure substantially equal to
As described above, the excavation work of the face 5a is continuously continued without stopping the pressurized supply of the muddy water 20. Then, the shield device 2 is connected to one of the single pipes 9 constituting the mud feed pipe 7A.
When the pipe 13 has been advanced by the length L1, the frame 13 of the pipe extension device 10 is again attached to the shielding device 2 as described above.
Is advanced by the amount corresponding to the forward movement of the rotating body 14 and the extension operation of the mud feed pipe 7A is performed by adding a new single pipe 9 'to the single pipe 9 through the rotating operation of the rotating body 14 and the projecting operation of the movable pipe 12. By adding a single pipe 9 'to the mud feed pipe 7A, the inside
By repeating the operation of replenishing and loading a new single pipe 9 ′ into the empty sheath pipe 17, the pressurized supply of the muddy water 20 is continuously performed without any pause, that is, the face 5 a is stabilized. It is possible to extend the mud pipe 7A without any trouble while continuously digging in the state. Therefore, the mud pipe 7A
There is no need to temporarily cut the mud feeding pipe line 70 to temporarily suspend the mud feeding in order to extend the pipe length, and all the pipe extending work is processed inside the pipe extending device 10, so that it is efficient and By not cutting the mud feed pipe 70, the labor required for pipe extension work can be saved, and the pipe extension device 10 can prevent the muddy water 20 from overflowing into the tunnel 5, so that the cleaning work corresponding to that can be omitted. You can do it. Furthermore, the pressure in the new single pipe 9 'to be added to the laid muddy pipe 7A is:
Prior to the pipe extension work and during the pipe extension work,
The bypass flow path 7 continues even when the rotating body 14 rotates.
0s, 70p, the muddy water 20 is maintained in a state where the muddy water 20 is pressure-fed and circulated at a predetermined pressure in the same manner as the mud feeding pipe line 70 formed by the mud feeding pipe 7A. Also, the supply pressure of the muddy water 20 to the shield device 2 side can be arbitrarily adjusted. In addition, when constructing the tunnel 1, the excavated scrap formed from the face 5a by the shield device 2 is completely similar to the mud pipe 7A described above by the mud pipe extension device exactly the same as the pipe extension device 10.
Since the sludge operation is carried out to the pit side through a sludge pipe that can be quickly extended without interruption for a while, the sludge pipe extension work can be performed smoothly, as well as during tunnel excavation. The amount of sludge in can always be arbitrarily adjusted. Therefore, if the pipe extension device 10 is used,
The face 5a can be maintained at a predetermined mud pressure in response to the sudden fluctuation of the face 5a quickly, so that the stable excavation work can be continued at any time, and the work can be performed safely and with good workability. The tunnel 1 can be constructed.

In the above-described embodiment, the rotating body 14 has the four sheath tubes 17 supported by the rotor flanges 18 and 19, and the axis of each of the sheath tubes 17 is the same circle. Although the example in which the circumference is rotatable at a 90-degree pitch has been described, the number of the sheath tubes 17 and the manner of rotation thereof are arbitrary. For example, the rotating body 14 has two sheath tubes that can be selectively positioned, that is, alternately, between the muddy pipe receiving mechanism such as the connection cylinder 35 and the connection pipe mechanism such as the movable pipe 12 and the joint cylinder 15a. Alternatively, the rotating body 14 may include a plurality of the sheath tubes 17 having more than four, and the plurality of sheath tubes 17 may rotate on an arbitrary orbit. It may be configured such that it can be selectively positioned between the muddy pipe receiving mechanism and the connection pipe mechanism. Further, in the embodiment, in order to form the bypass passages 70 s and 70 p between the rotating body 14 and the stator flanges 15 and 16 which are the rotating body supporting means for supporting the rotating body 14, for example, the bypass passage 70 s is formed. In order to form the rotor 1, a groove 18 a is formed in the rotor flange 18 in an annular shape.
Although the example in which the bypass passages 70s and 70p are formed on the fourth side has been described, the bypass passages 70s and 70p may be formed by providing grooves or the like on the stator flanges 15 and 16 side.

[0039]

As described above, according to the present invention, the first rotating body supporting means such as the stator flange 16 and the second rotating body supporting means such as the stator flange 15 are fixed in the longitudinal direction of the tunnel construction direction. The first rotating body support means is provided with a mud pipe receiving mechanism such as a connection cylinder 35 so that the first rotary body supporting means can freely receive the tip of the existing mud pipe such as the open end 9a of the mud pipe 7A and the like. The mud pipe is provided so as to be slidably supported along the axis thereof, and is connected to a shield machine such as a shield device 2 at a position of the second rotating body supporting means facing the mud pipe receiving mechanism. A connecting pipe mechanism such as a joint cylinder 15a and a movable pipe 12 is provided freely, and between the first rotating body supporting means and the second rotating body supporting means,
A rotating body 14 having a plurality of sheath pipes 17 capable of accommodating mud pipes such as single pipes 9 and 9 ′ in each of the insides 17 s is rotatable, and the sheath pipe 17 is connected to the mud pipe receiving mechanism and the connecting pipe The first mechanism is provided so as to be selectively positioned between the mechanisms;
A plug mechanism 26, 2 which can selectively load a muddy pipe into the sheath pipe 17 in the rotary body supporting means and the second rotary body supporting means.
7, a first bypass passage 70s is provided between the first rotating body supporting means and the rotating body 14, and the muddy water pipe receiving mechanism and the sheath pipe 17 of the rotating body 14 are communicated with each other. The second rotating body support means and the rotating body 1
4, the second bypass flow path 70p is formed so as to allow the connection pipe mechanism and the sheath pipe 17 of the rotating body 14 to communicate with each other. When this is arranged between the muddy pipe receiving mechanism and the connecting pipe mechanism, the muddy pipe receiving mechanism and the connecting pipe mechanism are directly communicated, and other than when it is arranged between the muddy pipe receiving mechanism and the connecting pipe mechanism, The muddy pipe receiving mechanism and the connecting pipe mechanism can be communicated via the sheath pipe 17, the first bypass flow path, and the second bypass flow path. Therefore, when a mud pipe such as a mud pipe or a drain pipe for use in the mud shield method is extended, the pipe extension device 10 or the like is received by receiving the tip of the existing mud pipe through the mud pipe receiving mechanism. If the muddy pipe extension device according to the present invention is installed, the muddy water 20 is connected to the muddy pipe receiving mechanism and the connecting pipe mechanism via a sheath pipe disposed between the muddy pipe receiving mechanism and the connecting pipe mechanism. The mud is sent and discharged in such a way that it always flows through the space. And
When extending the existing mud pipe, if the mud pipe extending device is advanced with respect to the existing mud pipe, the existing mud pipe is moved along its axis while being supported by the mud pipe receiving mechanism. Therefore, a new mud pipe should be added between the mud pipe receiving mechanism and the connecting pipe mechanism so as to be arranged in front of the tip of the existing mud pipe. A space portion is formed. Therefore, in this state, by rotating the rotating body 14, the sheath pipe 17 containing the muddy water pipe in its inside 17 s is positioned between the muddy water pipe receiving mechanism and the connection pipe line mechanism. It is possible to arrange the new mud pipe accommodated by the positioned sheath pipe 17 in the space where the above-mentioned new mud pipe is to be added, and to add the new mud pipe to the tip of the existing mud pipe. Easy to do. At this time, during the rotating operation of the rotating body 14, a state in which no sheath pipe 17 is arranged between the muddy pipe receiving mechanism and the connection pipe mechanism appears. When the rotating body 14 rotates, the muddy water pipe receiving mechanism and the connection pipe mechanism can be communicated via the sheath pipe 17 and the first bypass flow path and the second bypass flow path arranged at arbitrary positions. Therefore, if this operation is performed, the flow of the muddy water can be continued without stopping even during the rotation operation of the rotating body 14. In the present invention, the sheath tube 17 is connected to the sheath tube 1 via the first and second bypass passages.
7 is positioned between the mud pipe receiving mechanism and the connection pipe mechanism in a state where the pressure mud is circulated and filled in the mud pipe accommodated in the inside 17 s of the internal pipe 7. There is no fear that the mud pressure will drop before the new mud pipe is filled with pressure mud.
In addition, in the sheath pipe 17 which is performing a loading operation for loading a new muddy pipe into the inside 17s through the loading means, the sheath pipe 17 is connected to the first bypass flow path and the second bypass flow path. If it is not in communication with the road, at the time of the loading operation, the inside 17s of the sheath tube 17 where this is performed is performed.
The pressure muddy water in the bypass flow path does not get mixed in. Therefore, according to the present invention, the mud pressure can be adjusted to an arbitrary value continuously while adding a new mud pipe to the tip of the existing mud pipe. When urging of muddy water is urgently required, or when it is necessary to immediately adjust the amount of muddy water in the mud pipe, this can be performed at any time, that is, even during extension of the mud pipe. Therefore, there is no danger of incurring sludge or the like and causing face collapse. Therefore, according to the present invention, the excavation work can be performed in a stable state at all times while the muddy water pipe is extended without trouble, and the workability can be improved.

[Brief description of the drawings]

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

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

3 is a cross-sectional view of the muddy water pipe extension device shown in FIG.

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

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

FIG. 6 is a partially enlarged view showing a plug opening state in the muddy water pipe extension device shown in FIG. 2;

FIG. 7 is an enlarged view showing a connection portion between a laid muddy water pipe and a new muddy water pipe added thereto in the muddy water pipe extension device shown in FIG. 2;

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

FIG. 9 is a sectional side view showing a method of extending a muddy pipe in the muddy pipe extending apparatus shown in FIG. 2;

FIG. 10 is a sectional side view showing a method of extending a muddy pipe in the muddy pipe extending apparatus shown in FIG. 2;

11 is a sectional side view showing a method of extending a muddy pipe in the muddy pipe extending apparatus shown in FIG.

[Explanation of symbols]

 2 Shield machine (shield device) 7A Existing mud pipe (mud feed pipe) 70s first bypass flow path (bypass flow path) 70p second bypass flow path (bypass flow path) 9 , 9 '... mud pipe (single pipe) 9a ... tip (open end) 10 ... mud pipe extension device (pipe extension device) 12 ... connecting pipe mechanism (movable pipe) 15a ... connecting pipe mechanism ( Joint cylinder) 15 Second rotating body supporting means (stator flange) 16 First rotating body supporting means (stator flange) 17 Sheath tube 17s Inside 26, 27 Loading means (plug mechanism) 35) Mud pipe receiving mechanism (connection cylinder)

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21D 9/06 301 E21D 9/12

Claims (1)

(57) [Claims] A first rotating body supporting means and a second rotating body supporting means are provided at a predetermined interval in a front-rear direction in a tunnel construction direction, and the first rotating body supporting means has a muddy water pipe receiving mechanism. Is provided so as to be able to receive the tip of an existing muddy pipe and to be able to slidably support the muddy pipe along its axis, and to face the muddy pipe receiving mechanism of the second rotating body support means. At a set position, a connecting pipe mechanism connectable to the shield machine is provided, and between the first rotating body supporting means and the second rotating body supporting means, a sheath pipe in which a muddy pipe can be accommodated inside each of them. A rotary member having a plurality of rotatable members and the sheath tube is provided so as to be selectively positionable between the muddy water tube receiving mechanism and the connection pipe line mechanism, and wherein the first rotary member supporting means and the second rotary member are provided. Rotator support means,
Loading means for selectively loading a muddy pipe into the sheath pipe; a first bypass flow path between the first rotating body supporting means and the rotating body; a muddy pipe receiving mechanism and the rotating body; And a second bypass flow path between the second rotating body support means and the rotating body, and a communication between the connecting pipe mechanism and the sheath pipe of the rotating body. A mud pipe extension device formed and constructed in a form that can be obtained.