JPH0564295U - Tunnel excavator agitator equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the mud pipe from being blocked by excavated soil. [Structure] The earth and sand excavated by a cutter head 3 provided in the front part of the shield body 1 and taken into the chamber 1d are slurried by the muddy water injected from the mud feeding pipe 4 and discharged by the mud drain pipe 5. In the tunnel excavator, the inlet 5 for opening the sludge pipe 5 into the chamber 1d
The outer pipe 5a having d and the inner pipe 5b slidable back and forth by the gap adjusting cylinder 10 with respect to the outer pipe 5a are provided, and the tip of the screw 5c provided in the sludge pipe 5 is connected to the outer pipe. The inside of the sludge pipe 5 is protruded from the inlet 5d of 5a into the chamber 1d, and a blade 7a for stirring the sand and sand is provided at the tip of the blade 5a to stir the sand and sand taken into the sludge pipe 5 by the blade 7a. This is to prevent the blockage due to the sediment.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an agitator device for a tunnel excavator that prevents a mud pipe from being blocked by soil.

[0002]

[Prior Art]

 In a tunnel excavator in which mud is injected into the soil that has been conventionally excavated by a cutter head and taken into the chamber to make it into a slurry, and the sediment is discharged by a mud pipe, the soil is discharged depending on the soil quality of the face to be excavated. Mud pipe entrances are often blocked by sediment, making mud removal difficult. For this reason, when it has become difficult to discharge sediment due to the blockage of the sludge pipe in the past, mud is sent to the sludge pipe to reverse the flow of sediment, and the vicinity of the mud pipe inlet is searched for with a stick to close it. Blockage of the mud pipe is prevented by removing the clogged sand and sand, or by installing another agitator near the entrance of the mud pipe to stir the sand well.

[0003]

[Problems to be solved by the device]

 However, in the method of injecting mud water into the mud pipe to reverse the flow of closed soil, excavation must be interrupted during that time, which leads to a decrease in excavation efficiency, and in the method of exploring the vicinity of the inlet of the mud pipe with a rod, etc. Since it is necessary to stop the injection of muddy water into the chamber, there is a risk that the earth pressure balance between the cutting face and the chamber will be disrupted and the cutting face will collapse, which is dangerous to the work and the vicinity of the inlet of the sludge pipe. The method of installing an agitator has problems such as not being applicable to a small-diameter tunnel machine with no space for installing an agitator. The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to provide an agitator device for a tunnel excavator that can be easily installed in a small space.

[0004]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention injects the earth and sand excavated by a cutter head provided in the front part of the shield body and taken into the chamber from a mud pipe. In a tunnel excavator that is made into slurry with mud water and discharged through a mud discharge pipe, an outer pipe having an inlet that opens the above-mentioned mud pipe into the chamber, and a front and rear gap control cylinder for the outer pipe. In addition to being composed of a slidable inner pipe, the tip of the screw provided in the sludge discharge pipe is projected from the inlet of the outer pipe into the chamber, and a blade for stirring earth and sand is attached to the tip.

[0005]

[Action]

 With the above configuration, since the sand and sand that are well agitated by the blades are taken into the mud pipe, the mud pipe is not blocked by the sand and the gap adjustment cylinder adjusts the gap between the blade and the partition wall. The size of the gravel taken into the mud pipe can also be limited.

[0006]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a transverse sectional view of the tunnel machine, Fig. 2 is a longitudinal sectional view of the same, and Fig. 3 is a front view showing the blade shape of the agitator device. In these figures, 1 is propelled into the ground by a shield jack (not shown). The shield body is shown. The shield body 1 is composed of a front shield 1a and a rear shield 1b. Between the shields 1a and 1b, an articulate jack 2 can be bent, and the front end of the front shield 1a is not shown. Cutter head A cutter head 3 rotated by a motor is provided. A large number of disk cutters 3a are rotatably mounted on the front surface of the cutter head 3, and the earth and sand excavated by these disk cutters 3a are taken into a chamber 1d which is kept airtight by a partition wall 1c. ing.

In addition, mud water is injected into the chamber 1d by the mud pipe 4 so that the pressure inside the chamber 1d and the pressure of the face are balanced, and the earth and sand taken into the chamber 1d is cut by a cutter. As the head 3 rotates, it is stirred with the injected muddy water to form a slurry, which is then discharged from the sludge discharge pipe 5. The sludge discharge pipe 5 is installed substantially horizontally below the center of the shield body 1 and has a double structure of an outer pipe 5a and an inner pipe 5b on the tip side. The front end of the outer pipe 5a penetrates through the partition wall 1c to open in the chamber 1d, and a seal 6 is interposed between the rear end side of the outer pipe 5a and the front end side of the inner pipe 5b.

On the other hand, a screw 5c is housed in the inner pipe 5b of the sludge discharge pipe 5. The tip of the screw 5c passes through the outer pipe 5a and projects into the chamber 1d, and an agitator 7 is attached to the tip. The agitator 7 is composed of a plurality of blades 7a having a substantially Y shape, and the blades 7a are attached to the tip of the screw 5c with a front-rear interval with a phase shift as shown in FIG. The soil and sand near the inlet 5d of the sludge discharge pipe 5 are agitated with the rotation of the screw 5c.

On the rear end side of the screw 5c, the outer peripheral portion is fixed to the inner peripheral surface of the drive cylinder 8a of the drive mechanism 8. The drive mechanism 8 is provided with a gear case 8b on an outer peripheral portion of a drive cylinder 8a, and a drive motor 8c is attached to the gear case 8b. The drive motor 8c is adapted to rotate the drive cylinder 8a via a pinion 8d provided in the gear case 8b and a gear 8e provided on the outer peripheral surface of the drive cylinder 8a, thereby connecting to the drive cylinder 8a. The screw 5c that has been rotated can be rotated. Further, as shown in FIG. 1, a pair of gap adjusting cylinders 10 are provided between both ends of the gear case 8b and the partition wall 1c, and these gap adjusting cylinders 10 move the inner pipe 5b relative to the outer pipe 5a in the front-back direction. By sliding it to, the gap 9 between the rear blade 7a and the partition wall 1c of the agitator device 7 can limit the size of the gravel taken into the inlet 5d of the sludge discharge pipe 5.

Next, the operation will be described. The earth and sand excavated by the cutter head 3 and taken into the chamber 1d are slurried by the mud water injected from the mud pipe 4 and taken from the inlet 5d of the mud pipe 5. However, an agitator 7 is provided at the inlet 5d of the sludge discharge pipe 5, and the blades 7a are rotated as the screw 5c rotates, thereby stirring the earth and sand taken in from the inlet 5d. As a result, the muddy water and the well-mixed earth and sand are taken into the mud pipe 5, so that the mud pipe 5 is not blocked. Further, by moving the inner pipe 5b back and forth by the gap adjusting cylinder 10 and adjusting the gap 9 between the blade 7a and the partition wall 1c, the size of the gravel taken into the sludge pipe 5 can be limited, which is large. It is also possible to prevent clogging caused by the gravel being taken into the sludge discharge pipe 5.

[0011]

[Effect of the device]

 As described in detail above, this device has an agitator blade attached to the tip of the screw provided in the mud discharge pipe so that the sand taken in from the inlet of the mud discharge pipe is well agitated. Sediment will not be blocked in the mud pipe and it will not be difficult to excavate. In addition, since the size of the gravel that is taken into the mud pipe can be limited, large gravel will not be taken into the mud pipe and will cause clogging of the mud pipe. Since the blades of the agitator device are rotated using the screw, it is not necessary to separately install the agitator device as in the conventional case. As a result, it does not require a space for installing an agitator device, so that it can be easily applied to a small-diameter tunnel machine.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a tunnel machine according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a tunnel machine according to an embodiment of the present invention.

FIG. 3 is an enlarged front view of an agitator device according to an embodiment of the present invention.

[Explanation of symbols]

 1 Shield Main Body 1d Chamber 3 Cutter Head 4 Mud Pipe 5 Mud Pipe 5a Outer Pipe 5b Inner Pipe 5c Screw 5d Inlet 7a Blade 10 Gap Adjustment Cylinder

Claims (1)

[Scope of utility model registration request] 1. The earth and sand excavated by a cutter head 3 provided in the front part of the shield body 1 and taken into the chamber 1d are slurried by the mud water injected from the mud feed pipe 4 to be discharged by the mud drain pipe 5. In a tunnel excavator designed to discharge, an outer pipe 5a having an inlet 5d for opening the sludge pipe 5 into a chamber 1d, and an inner pipe slidable forward and backward by a gap adjusting cylinder 10 with respect to the outer pipe 5a. 5b, and a screw 5 provided in the sludge discharge pipe 5
An agitator device for a tunnel excavator in which the tip of c is projected from the inlet 5d of the outer pipe 5a into the chamber 1d, and a blade 7a for stirring the earth and sand is attached to the tip.