JPH06108780A - Sludge pipe device in sludge pressurizing type shield machine - Google Patents

Abstract

PURPOSE:To ensure a wide working space around a working face by connecting double type expansion pipes in sludge feed and discharge pipes in a sludge pressurizing type shield machine so that the front ends of the expansion pipes can follow up these sludge pipes even though the diameters of the sludge pipes are larger than those of the expansion pipes. CONSTITUTION:Double pipe type expansion pipes 4a, 4b are connected in sludge feed and discharge pipes 7, 6. When a front barrel 1 is advanced due to extension of slide jacks 5, the expansion pipes 4a, 4b are extended. When the front barrel 1 is moved backward due to retraction of the slide jacks 5, the expansion pipes 4a, 4b are contacted. Further, even though the sludge feed pipe 7 and the sludge discharge pipe 6 are large, the expansion pipes 4a, 4b are not deformed but are merely expanded and contracted in its axial direction. Accordingly, the front end parts of the sludge feed and discharge pipes can follow up the forward and backward movement of the front barrel within a small space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muddy water pressure type shield machine for advancing a front body forward and backward with respect to a rear body while ejecting muddy water, and particularly to a mud water feeding pipe and a mud pipe. When the diameter is large, the tip of the mud pipe and the mud pipe can follow the forward and backward movement of the front body.

[0002]

2. Description of the Related Art As a conventional underground excavator, while rotating a cutter attached to the front end surface of the front body, the front body is moved forward and backward with respect to the rear body, and at the same time, muddy water is jetted to the front part of the front body. A muddy water pressure type shield machine for discharging muddy water from a mud pipe to excavate is known. In such a shield machine, in order to enable each tip of the mud water feeding pipe and the mud feeding pipe to follow the forward and backward movement of the front body, a relatively thin mud feeding pipe having a diameter of 100 to 150 mm An extra hose corresponding to the forward stroke (about 1 m) of the front body is connected to the middle of each mud pipe.

[0003]

If the mud pipe and the mud pipe of the conventional mud pressure shield machine are relatively thin, the hose to be additionally connected is easily bent and the forward and backward movement of the front body is advanced. Can follow. However, the diameter of the mud pipe and the mud pipe is 200
If it is more than mm, the hose to be connected becomes thicker,
It is stiff and hard to bend, making it difficult to follow the forward and backward movements of the front torso. Further, if the hose becomes thick, it becomes heavy in weight, and if it contains muddy water, it becomes heavier, and it becomes difficult to support the hose between the connections. Furthermore, if the diameter of the hose is large,
There is a problem that the working space for the face cannot be taken large due to the difficulty of bending and the supporting material. Therefore, the present invention connects a mud pipe and a mud pipe of a mud pressure shield machine to a double-pipe expansion pipe so that the mud pipe and the mud pipe have a large diameter. The purpose of the present invention is to allow each tip to smoothly follow the forward and backward movements of the front torso and to allow a wide working space around the face.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a front body is configured to be able to move forward and backward with respect to a rear body, and muddy water is jetted from a mud pipe to a front part in the front body, and at the same time muddy water is discharged from a mud pipe. A muddy water pressure type shield machine adapted to discharge the above has achieved the above object. Therefore, a double-tube type expansion pipe is connected in the middle of each of the mud pipe and the mud pipe so that each tip of the mud pipe and the mud pipe can follow the forward and backward movement of the front body. .

[0005]

In the muddy water pipe apparatus of the muddy water pressure type shield machine of the present invention, since the double pipe type expansion and contraction pipes are connected to the mud pipe and the mud pipe, respectively, the front body moves forward with respect to the rear body. When this happens, the expansion tube expands, and when the front body moves backward, the expansion tube contracts, so that the tip ends of the mud pipe and the sludge pipe can smoothly follow the forward and backward movements of the front cylinder. In addition, if the diameter of the mud pipe and the mud pipe is large, the outer diameter of the expansion pipe will also be large, but the expansion pipe is strong and does not bend only by expanding and contracting in the axial direction, so no support material is required. In addition, a large working space for the face can be taken.

[0006]

EXAMPLE An example of a muddy water pipe apparatus of a muddy water pressure type shield machine of the present invention will be described with reference to FIGS. The muddy water pressure type shield machine is provided with a cutter device 2 having a large number of cutters on the front end face of the front body 1, and the front body 1 is fitted to the outer periphery of the guide cylinder 3a at the front end of the rear body 3 to Mounted hydraulic motor 4
With this, the cutter device 2 is rotated at the front end of the front body 1 to enable excavation. A slide jack 5 is provided between the front body 1 and the rear body 3 so that the front body 1 can move forward and backward with respect to the rear body 3. Further, a shield jack 5a is provided between the front body 1 and the rear body 3. Is provided so that the entire shield machine can be propelled by using the form (segment) 5b assembled for the primary lining in the rear body as a reaction force. Note that the state of FIG. 1 is during normal excavation with the front body 1 on the rear side, and the state of FIG. 2 is the state in which the front body 1 has advanced. Inside the front body 1 and the rear body 3, a mud pipe 7 and a mud pipe 6 are provided along the axial direction of each cylinder, and their tips are both located in the front part of the front cylinder 1 from a water supply source. The sent mud water is jetted from the tip of the mud feed pipe 7 to the front part of the front body 1, and the mud water in the vicinity thereof is sucked from the tip of the mud discharge pipe 6 and discharged rearward.

2 in the middle of the mud pipe 7 and the mud pipe 6 respectively
Heavy-tube type expansion and contraction pipes 4a and 4b are connected, and these expansion and contraction pipes are made of metal and can be expanded and contracted by substantially the same length as the forward and backward stroke of the front body 1. Telescopic tubes 4a, 4b
As shown in FIG. 3, an outer cylinder 9 is slidably fitted outside the inner cylinder 8, and flanges 10 for connection are provided at the outer ends of the inner cylinder 8 and the outer cylinder 9. Is connected to a flange provided at the connection end of the mud sending pipe 7 or the mud discharging pipe 6 with a bolt and a nut via a sealing material. Further, a seal material 11 is provided on the inner circumference of the inner end of the outer cylinder 9, and grease can be injected near the seal material 11. When the front body 1 is moved forward by the extension operation of the slide jack 5, the expansion tubes 4a and 4b are extended as shown in FIG. 2, and when the front body 1 is moved backward by the contraction operation of the slide jack 5, the expansion tube of FIG. To contract. Even when the diameters of the mud pipe 7 and the mud pipe 6 are large, the telescopic pipes 4a and 4b do not bend but only expand and contract in the axial direction, so the mud pipe 7 and the mud pipe 6 can be stored in a small space. It is possible to make the front end portion of the body follow the forward and backward movement of the front body 1.

[0008]

According to the muddy water pipe device of the muddy water pressure type shield machine of the present invention, a double pipe type expansion / contraction pipe is connected in the middle of the mud feeding pipe and the draining mud pipe to feed the forward / backward movement of the front body. Since the mud pipe and the tip of the mud pipe can follow each other, even if the diameter of the mud pipe or the mud pipe is large, it can smoothly follow the forward and backward movement of the front body, Moreover, since it is different from the conventional method of expanding and contracting the hose, a large space for bending the hose is not required, and a working space for the face can be widened.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a muddy water pressure type shield machine including a muddy water pipe device of the present invention.

FIG. 2 is a cross-sectional view of essential parts of the muddy water pressure shield machine when the front body of the shield machine is advanced.

FIG. 3 is a half cross-sectional view and an end view of a telescopic tube.

[Explanation of symbols]

 1 Front body 3 Rear body 4a Telescopic pipe 6 Mud pipe 7 Mud pipe

Claims (1)

[Claims] 1. A muddy water adder configured such that the front body can be moved forward and backward with respect to the rear body so that the muddy water is ejected from the mud pipe to the front part in the front body and the muddy water is discharged from the muddy pipe. In a pressure shield machine, a double-tube expansion tube is connected in the middle of each of the mud pipe and the mud pipe so that each tip of the mud pipe and the mud pipe can follow the forward and backward movement of the front body. A muddy water pipe device of a muddy water pressure type shield machine characterized by being configured.