JPH0492088A - Directional control method of shield excavator - Google Patents

Abstract

PURPOSE:To reduce an excavation area to make small excavation resistance and to make it possible to easily change a direction by constituting thrust jacks so that one thrust jack is advanced and that the other one is retreated. CONSTITUTION:In the facing having stronger bedrock strength and larger excavation resistance, when a direction of an excavator is changed downward, a thrust jack 21a is advanced, a thrust jack 21b transmits retreating curved advancement signals, a directional control valve 50 on the thrust jack 21a side is moved to the right, and a directional control valve 50 on the thrust jack 21b side is moved to the left. As a result, a cutter head is inclined with the center of the cutter head 10 or with a point A around it as the center as illustrated, so that a section B of the cutter head 10 is separated from the facing X-X. Therefore, an area of the facing to be excavated is reduced to a half or less than that, and excavation resistance is greatly reduced.

Description

[Detailed description of the invention] [Field of application for sedentary work] The present invention relates to a direction am method for a shield excavator, and is particularly applicable to a shield excavator with a small curvature diameter for excavating underground, such as a shield machine. 1i11 control method.

[Conventional technology]

Traditionally, improvements in public works investment and labor saving in various construction projects,
Shield tunneling machines are being used as efficiency increases.

1@1 is an overall configuration diagram of the shield tunneling machine, and FIG. 2 is a cross-sectional view showing the arrangement of the stator jack of the shield tunneling machine. The shield excavator 1 includes a cutter head IO, a front shield 20 that peripherally supports the cutter head 10, a rear shield 30 connected to the front shield 20, etc. G4, and the rear shield 30 connects to a segment 40 via a tail packing 31.
is in contact with the outer periphery of

A cutter 11 is disposed on the cutter head 10.

The front shield 20 and the rear shield 30 are swingably connected by a thrust jack 21. Further, a front gripper 22 is attached to the front shield 20, and a front gripper 22 is attached to the rear shield 30.
A rear gripper 32 is disposed at each of the rear grippers 32 and 32 . A shield jack 33 is disposed on the rear shield 30 and comes into contact with the segment 40 when expanded.

As shown in Fig. 2, the thrust jack 21 has upper, lower,
4 on the left and right, 21a, 21. b, 21c, and 21d, and each thrust jack is equipped with a variable displacement pump or an electromagnetic flow ff1vI control valve (not shown in Fig. 1) to control the amount of oil supplied to each thrust jack 7. The excavator is running straight or in a curved direction. Recently, in order to increase the digging force, some shields have 84 or more thrust jacks arranged in a ring inside the shield, but here we will explain 4: To make it easier to understand, we will use 4 thrust jacks. Next, explain.

When performing excavation work, use the rear gripper 3 of the rear shield 30.
24'-With the cutter/rad 10 being stretched on the wall, the cutter/rad 10 is rotated by a machine (not shown), and the thrust jack 21 is extended according to a predetermined straight mode to start digging. At this time, the shield jack 33 is in a fully contracted state, and the segment 40 is not subjected to voltage detection because the rear shield 30 is fixed by the lever gripper 32. Also, the front gripper 22 is retracted.

The front shield 20 moves forward without receiving any resistance. When the robot moves forward a predetermined distance, the gripper 32 is retracted and the front gripper 22 of the front shield 20 is stretched to the tension 9. Then, while the thrust jack 21 is retracted, the shield jack 3; 34 is extended to bring it into contact with the segment 40v', and the reaction force V of the segment 400 advances the rear shield 30. When the thrust jack 21 is fully contracted, the front gripper 22 is retracted, the rear gripper 32 is stretched against the wall, the shield jack 7-33 is retracted, and work is ready.

The work described in L may involve going straight, and when you want to go around a turn, extend the thrust jack 21 opposite to the direction you want to turn to dig. The lever 21a is advanced by a predetermined amount according to a predetermined progression key.

[gA problem that the invention attempts to solve]

However, according to the conventional method, as shown in Fig. 85, each thrust jack is extended according to a predetermined turning mode when making a turn.
-The direction of the cutter head is changed as shown by the dotted line, using the 0 point at the top as a fulcrum. Therefore, the cutting face is JII! with the front area of the cutter head! Depending on conditions such as the strength of the ground, excavation of the face 1? I resistance increases and the direction of the cutter head is changed to a predetermined 7111' 1Il
l &: Sometimes it is difficult to change. especially,. If the face is self-supporting, the strength of the ground is strong and it may be impossible to change the direction of the excavator.

The present invention has been made by paying attention to the problem described in item 1, and is a shield excavator that can change the direction of the excavator to a predetermined direction even in the ground with large resistance. The purpose is to provide a direction control method.

[Means to solve the problem]

In order to achieve the above object, in the direction control method for a shielded excavator according to the present invention, in a shield excavator that has a cutter head, a front shield that is bent with respect to the excavation direction, and a rear shield, the front shield and the rear shield, and propels the cutter head rotatably attached to the front shield to move one thrust jack forward and at the same time move the other thrust jack backward. It is characterized by this.

[For production]

]-7 According to the configuration, the thrust jack on the - side can be moved forward and the other thrust jacks can be moved backward, so the cutter head on the side of the thrust jack that is moving backward is Therefore, the excavated area is reduced, the excavation resistance becomes smaller, and a change in history of 8 to 111 is possible.

〔Example〕

Hereinafter, an embodiment of the direction control method for a shield tunneling machine according to the present invention will be explained with reference to the drawings. Fig. 3 is a hydraulic circuit diagram of the direction control device for a shield tunneling machine according to the present invention. Yes, each thrust jack 21 and electromagnetic type 3
The position direction control valve 50 is connected. In FIG. 3, only the rainbow thrust jacks 21a and 21C are shown to simplify the explanation, but the circuits of the other thrust jacks are also the same. The direction control valve 50 is connected to the oil I]'-pump 51, and the discharge circuit V' of the oil I1 pump 51 is provided with a pressure regulating valve NJ.

F (3 is mail bread.

Next, to explain the operation 4, when neutral, the circuit of the jack is closed (', is closed. During straight excavation, the circuit is not shown)
In response to the signal, the C direction control valve 50 moves to the right.
Go straight. When changing the direction to the tT force shown in Fig. 4 in a face where the ground strength is high and the excavation resistance is large, the thrust jack 21a moves forward from the control device, and the thrust pano jack 21b moves backward, in a curved advance mode. Signal Rei Sending L2
, the direction control valve 50 on the thrust jack 21a side is moved to the right, and the direction control valve 50 on the thrust jack 21b side is moved to the right.
Move to Sue.

Therefore 1. Cutter head 101! , as shown by the dotted line V in Figure 4, the force is tilted around point A at or near the center of Rad 10, so the force is
Part B of is away from the face XX.

Therefore, the area of the face to be excavated is small.

becomes 1.2 from then on, and the digging-J resistance is reduced by the width ζ2.

〔Effect of the invention〕

Below 1. As explained above, according to the present invention, when the shield tunneling machine is to be moved in a curved direction, the power of the plurality of thrust jacks that propel the cutter head is applied so that the force of the plurality of thrust jacks is applied to move the cutter head forward and at the same time, the other side moves backward. As a result, the cutter head on the reverse side moves away from the face, reducing the excavation area and providing directional control of the shield excavator that allows the cutter head to be directed in a predetermined direction even in ground with high excavation resistance. .

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of the shield tunneling machine, Fig. 2 is a cross-sectional view showing the arrangement of the thrust jack, Fig. 3 is an oil H4 circuit diagram of the direction control device of the present invention, and Fig. 4 is a diagram of the oil H4 circuit diagram of the direction control device of the present invention. Explanatory diagram of direction control, FIG. 5 1j is an explanatory diagram of conventional direction control. J・・・・・・・・・Shield excavator cutter・＼Grot・Front shield after shield・Thrust jar, 4・Directional control valve・・・・・・Hydraulic pump

Claims (1)

[Claims] In a shield excavator having a cutter head, and a front shield and a rear shield that are bent with respect to the excavation direction, the front shield and the rear shield are connected, and the cutter head rotatably attached to the front shield is propelled. A direction control method for a shield excavator, comprising a plurality of thrust jacks, and the method includes moving one thrust jack forward and simultaneously moving the other thrust jack backward.