JPH0485489A - Direction controller of shield excavator - Google Patents

Abstract

PURPOSE:To facilitate excavation by connecting a front shield to a rear shield, and dividing thrust jacks driving a cutter head fixed to the front shield into a plurality of groups to arrange selector valves. CONSTITUTION:A shield excavator 1 is constituted of a front shield 20 to bear the perimeter of a cutter head 10, a rear shield 30 connected to the front shield 20 through a spherical surface 21 and thrust jacks 22 arranged in equal parts in the shape of a circle. Front grippers 23 are provided to the front shield 20, and rear grippers 32 are provided to the rear shield 30 to arrange shield jacks 33. After that, the thrust jacks 22 are divided into up, down, right and left groups and are arranged, and selector valves to operate one or more thrust jacks 22 are arranged. According to the constitution, excavation with a smaller radius of curvature, etc., can be easily made.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is applicable to the direction of a shield excavator, the threshold, the B sheathing, the two-sided bend in the L, and especially the small radius of curvature for excavating the ground F, such as a shield machine. Concerning the direction control device of the Nordhori 111 aircraft.

(Conventional technology) In the past, efforts were made to increase investment in public works projects and save labor in various construction projects.
Shield tunneling machines are being used as efficiency increases.

In a shield tunneling machine, four bins and thrust pins are arranged on the upper, lower, right, and left sides of the inner circumference of the shield, at the joint between the front and rear shells, and the two bins are centrally located. The connecting portion is bent vertically or horizontally to allow the shield tunneling machine to move in a curved direction. Recently, in order to increase the digging power, shield excavators have been developed by arranging thrust jacks of 81i1 or higher in a ring shape inside the shield, and installing one thrust jack with one pump or an electromagnetic flow control valve on each thrust jack. is progressing. At this time, the direction control of the shield tunneling machine depends on which of the thrust jacks (up, down, right, left) is selected. Inside the mine 9, Aji: An optical oscillation device that generates coherent light, such as a laser, is installed in the starting shaft of the 7-1 route machine, and the device irradiates light onto the tunnel meter Iil line. However, a method of measuring the deflection and declination angle of the Nord machine, which reads the light spot of the target 11 attached to the Nord machine, is used.

(This is a problem that the invention aims to solve!) However, according to the former method, ■ To obtain a large propulsion force, high-pressure, large-capacity hydraulic equipment is required, and it is difficult to store it. The shield section also takes up a lot of space.

■ When performing refraction, it is necessary to attach and detach the top and bottom or left and right bins, which makes work difficult.

In the latter case, ■ It is necessary to use a large number of pumps or electromagnetic flow control valves depending on the thrust jack, and a large number of sensors are also required for control, making the control circuit complicated. , the cost will increase.

■Multiple thrusts - Load is concentrated on only one back of the totsuki, causing uneven load to the segment.■ Thrust force is insufficient when digging through a small radius of curvature or hard soil.

Further, if the thrust force is set according to a small radius of curvature, the equipment becomes large, and when the radius of curvature is large, too much thrust force is wasted.

■ Underground surveying using trunnots, etc. is not practical if the tunnel to be excavated is curved and the radius of curvature is small, requiring many measurement points and requiring a lot of man-hours. In addition, in the method using laser light, if the tunnel is curved, the laser light from the starting shaft may not be able to irradiate the target, making it necessary to move the optical oscillation device to an appropriate position.

There are other problems.

The present invention focuses on the above-mentioned conventional problems, and relates to a direction M barrier device for a Nord excavator, and particularly relates to a directional guide device for a Nord excavator with a small radius of curvature for excavating underground.
The purpose is to provide summer clothing.

(Means for Solving the Problems) In order to achieve the above object, a first invention according to the present invention provides 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 thrust jack, which connects the front shield and the rear shield and propels the cutter head rotatably fixed to the front shield, is divided into multiple groups and propels the cutter and rad when bending. A switching valve is provided to operate at least one thrust jack in another adjacent group when the thrust of the thrust jack in the group is insufficient. In the second invention, the thrust jack that bends the front shield and the rear shield is waled by the stroke of one thrust jack in the group.

(Function) According to the above configuration, the scattered thrust jacks are divided into FjI number of groups in the upper, lower, left, and right directions so that they can receive support from the thrust jacks of other adjacent groups.
Even when excavating a small radius of curvature or hard soil, it can be easily excavated. Also, the direction of excavation! II treats each group like a single thrust jack,
Controls the stroke of one thrust jack. For this purpose, it is only necessary to control at least the four thrust jacks on the top, bottom, left and right sides, and the number of equipment such as pumps, electromagnetic flow control valves, and sensors required for this can be reduced, reducing costs and reducing costs. The storage space can be reduced, and direction control becomes easier. Further, there is no need to increase the thrust force within the group, and the pressure within the group becomes an even load, so that the load on the segments can be made even.

(Example) Below, an example of the direction control device for a shield excavator according to the present invention will be briefly described with reference to the drawings. Fig. 1 is an overall configuration diagram of the -. 4
Fig. 3 is a hydraulic circuit diagram of the direction control device of the shield excavator. In FIG. 1, the shield excavator I has a cutter head 10, a front shield 20 that peripherally supports the cutter head 1(), a rear shield 30 connected to the front shield 20, etc., and the rear shield 30 has a tail. Segment 40 through Patsukin 31
is in contact with the outer periphery of A disk cutter 11, a bit 12, and a copy cutter 13 are arranged in the cutter head IO. The front shield 20 and the rear shield 30 have a spherical surface 21
They are connected via thrust jacks 22 that are equally spaced around the circumference. Further, a front gripper 23 is provided on the front shield 10, and a rear gripper 32 is provided on the rear shield 30. A shield jack 33 is disposed on the rear shield 30 and comes into contact with the segment 40 when expanded. In FIG. 2, the thrust jack 22 includes an upper group 110, a lower group 120, and a right group I30 in the forward direction.
, left group 140, etc., and are divided into upper, lower, left, and right groups. Each group 110.120.13
0.140 is, for example, ji+'7ki 110a, 110b
, 110c, l]Od, and 110e. Each group +10.120, +30.140 has a variable pump 111.121.1 as shown in FIG.
31.141 to direction xi valve 112.122.132.
Royal oil is supplied via 142. Also, each group 1
A stroke sensor 113.123.133.143 is disposed in one of the jacks 10.120.130.140, for example, 110C1120c, 130c, and 140c. An electromagnetic proportional control valve 114.124.134.144 is arranged between the pump 111.121.131.141 and the directional control valve 112.122.132.142. Also, each group 110.120.130
, 140 part 8 gloss and directional control valve 112.122
．． Between 132 and 142, there are switching valves 151-152,
l 5 :i, +54 is arranged. For example, gloss,
key 110e and direction 14 control valve 112 and ja, key 120
A switching valve +51 is provided between the direction control valve 122 and the direction control valve 122.
A switching valve 152 is located between the directional control valve 132 (not shown) and the
is installed. (The same applies hereinafter.) Next, the operation of the above configuration will be explained.

When performing excavation work, the rear gripper 3 of the rear shield 30
2 is stretched on the tunnel wall 2, the cutter head 10 is rotated, the thrust jack 22 is extended, and digging is started. At this time, the shield jack 33 is in a fully contracted state, and since the rear shield 30 is fixed by the rear gripper 3'2, no load is applied to the segment 40. In addition, the front gripper 23 has shrunk, and the front shield 10
moves forward without resistance. Stroke sensor 113
．． 123.133.143, the rear gripper 32 is retracted and the front dog 111 bar 239 of the E1 node 10 is tightened. After the front gripper 23 is attached to the shaft wall 2, the shield jack 33 is extended while the thrust lever 22 is retracted, and the rear shield 30 is moved forward. When the shield jack 33 is fully retracted, the rear gripper 32 is attached to the shaft wall 2 and the above-mentioned work begins.

The above-mentioned work is for going straight ahead, and when you want to go around a turn, extend the thrust jack 22 in the opposite direction to the direction you want to turn. For example, when the driver wants to turn left, the thrust jack 22 of the right group 120 disposed on the right side is moved forward by a predetermined amount.

At this time, the right group 120 is
The thrust jacks 22 of the left group 140 are moved forward by a predetermined amount while the thrust jacks 22 of the left group 140 are moved forward by a predetermined amount. When digging through a small radius of curvature or hard soil and feel a lack of propulsion while digging, turn on the switching valve 151.
．． 152, switches the switching valves 151 and 152 from the neutral port N to the working boat P, and also changes the direction!
4 control valve + 12.132δ and electromagnetic proportional 'M control valve 114.
Also send a signal to 13.1, direction; aq control valve +12.1.
32 is the neutral boat (n) to the active boat (p); switch this, increase the oil pressure with the electromagnetic proportional control valves 114 and 134, change the discharge amount of the variable pump 111 to gloss, ki 110e, and change the variable pump! The discharge amount of 31 is sent to the jack 130a, and the thrust of the jack 110e and +30a is the digging force (group 140
It becomes A. ). At this time, the discharge amount of the variable pump 111 is merged with the circuit of the variable pump I21 at the operating port P of the switching valve 151, so the variable pump 111
The discharge pressure of the variable pump 121 becomes the same. In addition, the propulsion speed can be increased since the variable pump 111 has the discharge amount of the variable pump 121 added to it, and the variable pump 11
1 and the discharge amount of the variable pump 121,
You can do the same thing as before the support. In addition, the opposite group (
In this case, group 140 includes JiQ 7ki 110a,
Add 130e. ) by switching in the same way,
The radius of curvature can be R1.

Figure No. 2 shows another actual aI+11. Identical parts are designated by the same reference numerals and explanations will be omitted. Each group 11(), 20.
130.140 end jack and directional control valve 112.
There is a 2-position switching valve 16+ between 122.132 and +42.
, 162.163.164.165.166.167.
168 are arranged. For example, gloss 110d, 1
A two-position switching valve 16 is provided between the directional control valve 112 and the directional control valve 10e.
1 is the jacks 120a, 120b and the directional control valve 122
A two-position switching valve 162 is provided between the jack 120d and the jack 120d.
A two-position switching valve 1 is provided between the directional control valve 120e and the directional control valve 122.
63 (hereinafter the same) is provided.

In the above configuration, when excavating a small radius of curvature or digging through hard soil and feeling insufficient propulsive force, a signal is sent to the switching valves 162 and 163, and the switching valves 162 and 163 are switched from boat R to boat R. Switch to . The discharge amount of the variable pump 122 is controlled by the jack 1 via the switching valve 162.
10d and 110e, and the discharge amount of the variable pump 122 is changed to 7 through the switching valve 463;
b Two-stroke, Shiny II (ld, I I Otr, l
,') [The thrust of 1a and 130b should be supported as digging power.

In the above embodiment, the number of glossy lines was explained as 20, but the number of glossy lines may be increased or decreased without being limited to this. Further, although the groups are arranged vertically, horizontally, and horizontally, the positions may be shifted. Furthermore, a front gripper 23 is provided on the front shield IO, and a rear gripper 32 is provided on the rear shield 30.
It is also possible to receive the reaction force of the thrust jack with the segment without attaching the grille or pa. Furthermore, although the description has been made regarding the Nord excavator, it goes without saying that the invention can also be applied to other underground excavators.

(Effects of the Invention) As explained above, according to the present invention, a plurality of thrust jacks are divided into a plurality of groups vertically and horizontally so that they can receive support from thrust jacks of other adjacent groups. , it can be easily excavated even when excavating a small radius of curvature or hard soil. Further, a plurality of thrust jacks are divided into a plurality of groups, and each group is treated as one gloss and the stroke is controlled by 'R'. As a result, it is only necessary to control at least four cows, and the number of equipment such as pumps, electromagnetic proportional control valves, and sensors required for this is reduced, reducing costs and reducing the space to store them. . In addition, the pressure becomes uniform within the group, and the load on the segments can be made even, and a large propulsion force can be obtained, and directional control can be easily controlled, which is an excellent effect.

[Brief explanation of drawings]

Figure 1 is an overall configuration diagram of the shield excavator equipped with the direction vsm device of the present invention, and Figure 2 is the direction I4 of the shield excavator.
Fig. 3 is a hydraulic circuit diagram of the direction control device of the shield excavator, and Fig. 4 is the arrangement of the shield jack that controls the direction of another shield excavator #J of the present invention. It is a diagram. 1......Shield excavator 10...
・・・・・・Cutter head 32・ ・ ・ ・
・ ・ 40・ ・ ・ ・ ・ ・ 51, 52. 53. 54・・112, 122. 132. 142・113, 1
23. 133. 143・114, 124. 13
4. 144151, 152. 153. 15.1
Front Nord Thrust, gloss 7I rear 2 - Red Nord Noya, Ki segment variable pump directional control valve stroke sensor/electromagnetic proportional control valve/switching valve

Claims (2)

[Claims] (1) 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 are rotatably fixed to the front shield. The thrust jacks that propel the cutter head are divided into multiple groups, and when the thrust jack of the group that propels the cutter head lacks the thrust when bending, at least one or more thrust jacks of the adjacent group are activated. A directional control device for a shield excavator, characterized in that it is equipped with a switching valve to be operated. (2) The direction control device for a shield excavator according to claim 1, wherein the thrust jack that bends the front shield and the rear shield is controlled by the stroke of one thrust jack in the group.