JPH1025987A - Middle-bending device of shielding excavation machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a middle-bending device which eliminates middle-bending pins and which is freely bendable in all directions. SOLUTION: A cylindrical shield frame of a middle-bending device of a shielding excavation machine is divided into the front body 1a and the rear body 1b. These front and rear bodies 1a, 1b are connected through a plurality of middle-bending jacks N1-N12 arranged along the peripheral direction of the shield frame. Hydraulic pipes 9, 9 leading the hydraulic oil extruded from the extending jacks to the contracting jacks so that the extention length of one side jack coincides with the contraction length of the other side jack, are provided between middle-bending jacks positioned symmetrically against the sectional center of the shield frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending machine for a shield machine.

[0002]

2. Description of the Related Art As a shield machine, a cylindrical shield frame is divided into a front body and a rear body, and a plurality of middle folding jacks in which the front body and the rear body are arranged in a circumferential direction inside thereof are provided. There is known a so-called center-bent shield that is connected via a wire. Conventionally, the middle fold of the middle fold shield is connected to the front body and the rear body through diametrically arranged middle bending pins, and the one-side middle bending jack is extended with the pin interposed therebetween, and the other side is formed. The front torso and the rear torso are bent around the pins by contracting the center bending jack.

[0003]

The center bending pin is an indispensable member for bending the front body and the rear body with respect to the center axis of each body without eccentricity. In the case of a shield having a diameter, a bent pin cannot be installed due to a space problem, and the shield may not be realized as an actual machine. Further, since the front body and the rear body only bend around the center bending pin, the bending direction is limited. For example, if the bending direction is set to the left and right, it cannot be bent in the vertical direction.

An object of the present invention, which has been made in view of the above circumstances, is to provide a center bending device of a shield excavator that can bend in all directions by eliminating the center bending pin.

[0005]

In order to achieve the above object, the present invention divides a cylindrical shield frame into a front body and a rear body, and connects the front body and the rear body in the circumferential direction of the shield frame. In the center bending device of the shield machine connected via a plurality of center bending jacks arranged along, between the center bending jacks located symmetrically with respect to the cross-sectional center of the shield frame, the extension amount of one jack and In order to make the amount of contraction of the other jack coincide with the amount of contraction of the other jack, a hydraulic pipe is provided for guiding the hydraulic oil pushed out from the jack on the extension side to the jack on the contraction side.

According to the present invention, when one of the center bending jacks located at a symmetrical position with respect to the center of the cross section of the shield frame extends, the hydraulic oil pushed out from the jack is applied to the other center bending jack via the hydraulic pipe. Guided, the other half-fold jack contracts by the same amount. Thereby, even if there is no center bending pin, the front body and the rear body bend around the virtual center bending point with respect to the center axis of each body without eccentricity. In addition, it can be bent in all directions.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a side sectional view of the center-folding shield machine, and FIG. 1 is a transverse sectional view. As shown in the figure, a cylindrical shield frame 1 forming an outer shell of an excavator is provided with a front body 1.
a and a rear trunk 1b. The front body 1a is provided with a rotary cutter 2 for excavating a face, and the rear body 1b is provided with a plurality of propulsion jacks (not shown) for pressing an end face of an existing segment to advance the segment.

The front trunk 1a and the rear trunk 1b are connected to each other via a plurality (twelve) of bending jacks N1 to N12 arranged in the shield frame 1 along the circumferential direction. Both ends of each of the center bending jacks N1 to N12 are supported by the front trunk 1a or the rear trunk 1b via a spherical joint 3, a universal joint, or the like. The front trunk 1a and the rear trunk 1b are connected to the front trunk 1
The convex spherical seat 5 provided at the front end of the rear trunk 1b is inserted into and connected to the concave spherical seat 4 provided at the rear end of a.

The spherical surfaces of the concave spherical seat 4 and the convex spherical seat 5 are bent at the center where the central axis 6 of the front trunk 1a and the central axis 7 of the rear trunk 1b intersect when the front trunk 1a and the rear trunk 1b are bent. Center point 8
Each is formed in a barrel shape with a distance r from the radius r. According to such a configuration, if the front trunk 1a and the rear trunk 1b are bent around the center bending center point 8, the center bending jacks N1 to N12 are bent even in all directions.
No tangling occurs at both ends, and the sealing performance between the concave spherical seat 4 and the convex spherical seat 5 does not change.

The feature of this embodiment is that the center bending jacks N1 to N12 located at positions symmetrical with respect to the center of the cross section of the shield frame 1 (center bending center point 8)
In order to make the amount of extension of one jack equal to the amount of contraction of the other jack, hydraulic pipes 9, 9 for guiding hydraulic oil pushed out from the extension jack to the compression jack are provided.

More specifically, as shown in FIG. 1, twelve middle folding jacks N1 to N12 are divided into four blocks B1 to B4 at intervals of 90 degrees, three blocks each having a symmetrical position with respect to the sectional center 8. (B1 and B3, B2 and B4) are connected via the hydraulic piping 9 described above. According to this configuration, for example, the center bent jack N of the block B1
When 1 to N3 extend, the center bending jacks N1 to N3 of the block B3 located at the symmetric position contract by the same amount.

A bent jack N1 including the hydraulic pipe 9
FIG. 4 shows the hydraulic circuits N12 to N12. As shown in the figure, the rod chamber 10 and the head chamber 1 of the center-bent jacks N1 to N12
1 means the collecting pipes 12, 13 for each of the blocks B1 to B4.
It is put together by. The rod-side collecting pipes 12 are symmetrically positioned with respect to the center 8 of the section, and
Connected through. Shut-off valves 91 and 92 (normally open type) for opening and closing the pipeline are provided in each hydraulic piping 9.

Further, each rod chamber side collecting pipe 12 is connected to a pipe 14 branched from a connection portion with the hydraulic pipe 9. In each pipe 14, shut-off solenoid valves 51, 52, 53, 54 (normally closed type) and check valves 71, 72, 73, 74 are provided in parallel with the shut-off solenoid valves. On the other hand, shutoff solenoid valves 61, 62, 63, 64 (normally closed type) and check valves 81, 82, 83, 8
4 are interposed.

The piping 14 and the head chamber side collecting pipe 13
Are connected to different pipes 15 and 16, respectively.
These pipes 15 and 16 have directional control valve solenoid valves 41 and 4
2, 43 and 44 are provided, respectively. Hydraulic oil in a tank 18 pressurized by a pump 17 is supplied to these directional control valve solenoid valves 41 to 44 through an oil supply pipe 19.
The working oil is returned to the tank 18 through the oil drain pipe 20. A relief valve 21 with an unload solenoid valve is interposed between the oil supply pipe 19 and the oil drain pipe 20.

The operation of this embodiment having the above configuration will be described.

For example, from the reference state of FIG.
5, the direction switching valve solenoid valves 41 and 42 are switched to the cross side, and the shut-off solenoid valves 63 and 64 are switched to the open side, as shown in FIG.

Then, the hydraulic oil pressurized by the pump 17 is supplied to the oil supply pipe 19, the directional control valve solenoid valves 41 and 42, the pipe 1
6, flows through the check valves 81 and 82 and the collecting pipe 13 into the head chamber 11 of each of the center bending jacks N1 to N6 of the blocks B1 and B2. By this, each folded jack N
Hydraulic oil in the rod chamber 10 is extruded by extending 1 to N6.

The extruded hydraulic oil passes through hydraulic pipes 9 and 9, respectively, and the center bending jack N
7 to N12 flow into the rod chamber 10. Here, the head chamber 11 of each of the middle bending jacks N7 to N12 is
3. Since the tanks 18 are communicated with the tank 18 via the shut-off solenoid valves 63 and 64 and the oil drain pipe 20, each of the middle bent jacks N7 to N12 contracts by the amount of oil supplied from the extension side (N1 to N6).

More specifically, the middle side bent jacks N1 to N1
The hydraulic oil extruded from N3 activates the contraction-side half-fold jacks N7 to N9, and the extension-side half-fold jacks N4 to N4.
The hydraulic oil pushed out from N6 activates the center-folding jacks N10 to N12 on the contraction side. Therefore, the amount of extension of the middle bend jacks N1 to N3 of the block B1 and the amount of contraction of the middle bend jacks N7 to N9 of the block B3 coincide with each other.
2 Bending jacks N4 to N6 and block B4
The amount of shrinkage of the center bent jacks N10 to N12 matches.

For this reason, the front trunk 1a and the rear trunk 1b are
As shown in the figure, even if there is no center bending pin, the front trunk 1a and the rear trunk 1b do not become eccentric, and are the virtual rotation axes with respect to the center axes 6 and 7 of the trunks 1a and 1b. Break point 8
Bend around. Thereafter, when the desired amount of middle bending (middle bending angle) is reached, the directional control valve solenoid valves 41 and 42 are set to the neutral position, whereby each of the middle bending jacks N1 to N
Twelve hydraulic oils are blocked and each half-folded jack N1
To N12 are fixed, and the middle bending posture of the shield is maintained.

Similarly, when making a right turn, the middle bend jacks N7 to N12 of the blocks B3 and B4 are extended,
The center bending jacks N1 to N6 of the blocks B1 and B2 are contracted. To make a downward bend, the blocks B1 and B4 are expanded and the blocks B2 and B3 are contracted. When bending upward, the blocks B2 and B3 are expanded and the blocks B1 and B4 are contracted.

In the case of oblique bending, blocks B1,
B3 (or B2, B4) may be expanded and contracted with each other, and blocks B2, B4 (or B1, B3) may be set in a neutral state. That is, of the four blocks B1 to B4, by changing the combination of the two push blocks and the two pull blocks, or by providing a neutral block, the center can be bent in an arbitrary direction (up, down, left, right, diagonally).

Also, from the left-turned state in FIG.
In order to return to the reference state, as shown in FIG. 6, the directional control valve solenoid valves 43 and 44 are switched to the cross side, and the shut-off solenoid valves 61 and 62 are switched to the open side.
Thereby, the center bent jack N7 of the blocks B3 and B4
~ N12 expands and blocks B1, B2
The middle bent jacks N1 to N6 contract and return straight as shown in FIG.

In addition, when any of the center-bent jacks of any of the blocks is insufficiently stretched, the insufficient extension is corrected as follows. For example, as shown in FIG. 3 (c), when the middle bending jacks N1 to N3 of the block B1 are insufficiently stretched, the front trunk 1a is directed obliquely upward, and the center bending center 8 is shifted with respect to the center axes 6 and 7. , As shown in FIG.

First, the direction switching valve solenoid valve 41 is switched to the cross side, and the shut-off solenoid valve 51 is switched to the open side, so that the center bending jacks N1 to N1 of the block B1 are switched.
Extend 3 Then, the direction switching valve electromagnetic valve 43 is set to the neutral state, and the electromagnetic valve 91 is closed. As a result, the strokes of the oppositely bent jacks N7 to N9 of the block B3 are fixed. And the shut-off solenoid valves 52, 6
2, 54 and 64 are switched to the open side and block B
2, B4 middle bent jack N4 ~ N6, N10 ~ N12
To the free state.

Thus, the position of the opposing block B3 is fixed, and the oblique blocks B2 and B4 are free, so that the center bending jacks N1 to N3 of the block B1 are free.
Is corrected to the normal amount, a normal predetermined left turn is made, and the deviation of the center turn center 8 is corrected. When the center 8 is deviated from the center axes 6 and 7, the sealing performance between the concave spherical seat 4 of the front trunk 1a and the convex spherical seat 5 of the rear trunk 1b is deteriorated. Can avoid this.

Similarly, as shown in FIG. 3 (b), the center bent jacks N1 to N3 of the block B1 are too long and the front body 1
a, the center bending center 8 is displaced from the center axes 6 and 7, as shown in FIG. 8, the direction switching valve solenoid valve 41 is switched to the parallel side, and the shut-off solenoid valve 61 is turned off. , 62, 52, 64, and 54 are switched to the open side, and the solenoid valve 91 is closed.

As a result, the middle bent jacks N1 to N3 of the block B1 shrink, and the middle bent jacks N of the block B3 are reduced.
7 to N9 are fixed, and the center bending jacks N4 to N6 and N10 to N12 of the blocks B2 and B4 are free. Therefore, by correcting the shrinkage amount of the middle bending jacks N1 to N3 of the block B1 to the normal amount, a predetermined left turn is obtained, and the deviation of the center 8 of the center bending is corrected.

[0030]

As described above, according to the center bending device of the shield machine according to the present invention, the center bending pin can be eliminated, so that it can be bent in all directions and can be applied to a shield having a small diameter. .

[Brief description of the drawings]

FIG. 1 is a schematic view of a center bending device of a shield machine showing one embodiment of the present invention (a cross-sectional view taken along line II in FIG. 2).

FIG. 2 is a plan cross-sectional view of a shield machine equipped with the above-described folding device.

FIG. 3 is a view showing a state of a middle excavation of the shield machine provided with the above-mentioned mid-bending device.

FIG. 4 is a diagram showing a hydraulic circuit of the center-bent jack.

FIG. 5 is a diagram showing a hydraulic circuit when turning left.

FIG. 6 is a diagram showing a hydraulic circuit when returning straight ahead (turning right).

FIG. 7 is a diagram showing a hydraulic circuit when correcting insufficient elongation.

FIG. 8 is a diagram showing a hydraulic circuit when correcting overextension.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield frame 1a Front torso 1b Rear torso 8 Center of bending center as cross section center 9 Hydraulic piping N1-N12 Jack with middle bending

Claims (1)

[Claims] 1. A shield in which a cylindrical shield frame is divided into a front body and a rear body, and the front body and the rear body are connected via a plurality of bent jacks arranged along the circumferential direction of the shield frame. In the center bending device of an excavator, between the center bending jacks located symmetrically with respect to the center of the section of the shield frame, the extension side of one extension jack and the contraction amount of the other jack are adjusted to match the extension amount of one jack. A folding machine for a shield excavator, comprising a hydraulic pipe for guiding hydraulic oil extruded from a jack to a jack on a contracting side.