JP3241192B2 - Half-fold shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield-type shield excavator in which a shield body is divided into a plurality of shields and each shield is rotatably connected to each other so that the shield can be bent. This is an improvement of the folding mechanism.

[0002]

2. Description of the Related Art In a shield machine for excavating an underground pit such as a tunnel, there is a case where it is necessary to change a direction of excavation and make a turn, for example, when excavating a curved tunnel. In particular, recently, the excavation work of underground tunnels using shield excavators is concentrated in urban areas, and there are various restrictions when excavating underground tunnels. Is growing.
As such a shield excavator, a so-called center-fold type shield excavator in which a shield body is divided into a plurality of shields and each shield is rotatably connected so that the shield can be bent in the middle is conventionally known. Have been. Generally, the conventionally known half-folding type shield excavating machine is roughly classified into a system with a centering-pin and a system without a centering-pin. It can be divided into two methods. The present invention seeks to transform the existing half-folding mechanism in a center-folding type shield excavator to create a shield excavator having a mechanism of a system different from those of the conventional methods.

In order to make it easier to understand the technical significance of the shield machine of the present invention, each type of conventional half-fold shield machine equipped with each of these types of mechanisms will be described below. FIG. 4 is a vertical cross-sectional view of a conventional half-fold shield machine having a half-fold mechanism with a center-fold pin, and FIG. 5 is a diagram in which the shield is displaced when the middle-fold shield machine of FIG. FIG. 6 is a vertical sectional view of a conventional half-fold shield excavator equipped with a half-fold mechanism without a half-fold pin, and FIG. 7 is a vertical cross-sectional view of the half-fold shield excavator of FIG. FIG. 8 is a vertical cross-sectional view showing a state in which the shield is displaced at the time of the middle folding, and FIG. 8 is a vertical sectional view showing a state after the middle folding-type shield excavator in FIG. 6 is bent. The half-fold shield machine shown in FIGS. 4 and 5 and the one shown in FIGS.
Although they are of different systems, the parts denoted by the same reference numerals represent equivalent parts.

First, referring to FIGS. 4 and 5, a description will be given of a conventional center folding type shield machine having a center folding mechanism with a center folding pin. In FIG. A folding seal, 3 is a center folding pin, 4 and 5 are hulls as divided shields configured to be able to fold the shield main body, 4 is a front hull, and 5 is a rear hull.
The front hull 4 has a rear end fitted to an outer surface of a front end of the rear hull 5 so that the front hull 4 can be rotated in a horizontal direction about a diametrical vertical line of the hulls 4, 5, that is, a center folding center line Y. Same center line Y
It is pivotally connected by the center pin 3 at the upper and lower two places. The center line Y and the axis Z of the shield main body are provided on the outer surface of the front end of the rear hull 5 so that the front hull 4 can rotate while sliding with respect to the outer surface of the front end. With a spherical surface having a radius R centered at the intersection O with the front hull 4, and the inner surface of the rear end of the front hull 4 is sealed between the front hull 5 and the outer surface of the front end of the rear hull 5 during rotation. Is provided with a center fold seal 2. Further, the front hull 4 and the rear hull 5 are pivotally mounted on the center fold jack 1 so as to be swingable, and such a center fold jack 1 is provided on a pair of left and right and up and down.

A conventional half-fold shield excavator having a half-folding mechanism with a half-folding pin has such a configuration. When the front hull 4 is operated with a stroke difference, the front hull 4 rotates in the horizontal direction while sliding on the spherical surface of the front end outer surface of the rear hull 5 with the upper and lower two center folding pins 3 as axes.
The shield body can be folded right and left. Further, in this case, the space between the inner surface of the rear end of the front hull 4 and the outer surface of the front end of the rear hull 5 is maintained in a sealed state by the center folding seal 2 provided on the inner surface of the rear end of the front hull 4. .

Next, referring to FIGS. 6 to 8, a description will be given of a conventional center folding type shield machine having a center folding mechanism without a center folding pin. 4 and 5, the shield shield machine is also constructed by fitting and connecting the rear end of the front hull 4 to the outer surface of the front end of the rear hull 5 so as to be rotatable. The main hull 4 is configured so that it can be folded in the middle, and the inner surface of the rear end of the front hull 4 is provided with a middle between the fitted front hull 4 and the end of the rear hull 5 in a sealed state. A fold seal 2 is provided, and a front hull 4 and a rear hull 5 are provided with a center fold jack 1 for driving the shield body in the middle in a manner similar to that shown in FIGS. 4 and 5. Is provided. However, in the conventional half-shield shield machine shown in FIGS. 6 to 8, the rear end of the front hull 4 and the front end of the rear hull 5 are different from those shown in FIGS.
They are not connected by the half-fold pin 3 but are directly connected by the half-fold jack 1. Also, rear hull 5
Although the outer surface of the front end is subjected to a spherical processing so that the front hull 4 can rotate while sliding with respect to the front end outer surface when the front hull 4 rotates, as shown in FIG. The rear hull 5 is spherically processed so that an arc surface having a radius R 'is formed on the side opposite to the contact point O' with the front hull 4 with respect to the front hull 4. That is, the front hull 4 is replaced with the rear hull 5
When it is to be rotated about one side contacting with the hull, the other side of the front hull 4 facing the hull 5
The outer surface of the front end of the rear hull 5 is formed in a spherical shape so that it can rotate while sliding on the outer surface of the front end.

A conventional half-fold shield excavator having a half-folding mechanism without a half-fold pin has such a configuration. When one of the two is fixed and the other is operated, the front hull 4
And the other side opposite to the fulcrum is horizontally rotated while sliding on the outer surface of the spherical front end of the rear hull 5 so that the shield main body can be bent right and left. Further, in this case, the gap between the inner surface of the rear end of the front hull 4 and the outer surface of the front end of the rear hull 5 is maintained in a sealed state by the center seal 2 as far as the left and right areas are concerned.

[0008]

However, although the above-mentioned conventional half-type shield excavators each have advantages, all of them have serious drawbacks. Regarding a half-folding type shield machine having a half-folding mechanism with a center-folding pin, in such a type of half-folding type shield machine, when the shield body is bent in the middle, the front hull 4 is hulled. Folding pin 3 provided on the diametrical vertical line of 4, 5
, The gap in the fitting portion of the hulls 4 and 5 does not change in the left and right areas as well as in the upper and lower areas, and it is easy to seal the shield body middle bent part,
There is a problem in strength at the center fold. That is, when the shield main body is bent in the middle, the front hull 4 is connected to the rear hull 5 by the center bending pin 3 and further rotated by using this as a guide. The load at the time of excavation is concentrated mainly on the mounting portion of the center folding pin 3, and it is difficult to secure the strength at the center bending portion of the shield body. And when the diameter of the shield body is increased,
Correspondingly, the number of the center folding jacks 1 increases and the load increases. On the other hand, the center folding pins 3 can be provided only in the upper and lower two places. Such drawbacks are further exacerbated because stress is applied. Further, in such a type of half-fold shield excavator, the half-fold direction of the shield main body is limited by the mounting position of the half-fold pin 3 such as the horizontal direction in FIGS. 4 and 5. There are drawbacks.

Next, regarding a half-fold shield excavator having a half-fold mechanism without a half-fold pin, a half-fold pin 3 is provided in such a half-fold shield excavator of this type. Therefore, concentrated stress is applied to the center folding pin 3 to make it difficult to secure the strength, and the center bending direction of the shield body is not limited. There are sealing problems. That is, when the shield main body is folded in the middle, the front hull 4 rotates around one side contacting the rear hull 5 as a fulcrum.
In the left and right areas, the horizontal section does not change as shown in FIG. 7, but in the upper and lower sections, it changes as is apparent from the vertical cross section in FIG. There is a problem that it is difficult to seal at the center folded portion of the main body.

SUMMARY OF THE INVENTION The present invention is intended to solve various problems found in the prior art, and it is possible to secure the strength at the middle bent portion of the shield body and to sufficiently seal the middle bent portion. It is an object of the present invention to provide a half-bent shield excavator that has all the features of conventional various types of semi-bent shield excavators that can be bent in any direction while being capable of being bent.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hull having a structure in which adjacent ends of a plurality of hulls are fitted and connected so as to be pivotable with each other. It is provided between the shield body and the adjacent hull,
A plurality of half-jacks for driving the shield main body to bend by rotating the front hull of the adjacent hulls with respect to the rear hull; A buckle seal for maintaining a gap between the hull end and the outer surface of the hull in a sealed state. In the middle folding shield machine that forms a curved surface for sliding the inner surface of the hull, the curved surface formed on the outer surface of the end of the hull is the same as a spherical surface centered at the intersection of the center folding center line and the axis of the shield main body Symmetrical with the shield body axis as the axis of symmetry
Connection between the push-side ports of the center folding jack
And, when broken in the shield body, of the plurality of center-folding jacks, to a pulling operation to that of the selected one, the selection
The axis of the shield body is set as the symmetry axis for one of the selected
And push the other one in the symmetrical position ,
A hydraulic drive circuit is provided for controlling the front hull so as to be able to rotate around the axis of the shield main body passing through the intersection in the radial direction without the center folding pin. " Achieved by a mid-section shield machine as described.

[0012]

Since the center folding type shield machine according to the present invention has such a structure, the front hull has no center bending pin by driving the center folding jack while controlling the hydraulic driving circuit. Also, similarly to the half-folding mechanism with the half-folding pin, it rotates around the axis in the shield body radial direction passing through the intersection of the center-fold centerline and the shield body axis. And since the curved surface formed on the outer surface of the end of the hull is made to be a curved surface similar to a spherical surface centering on the intersection, the front hull has an inner surface at the end thereof at the time of rotation. It slides in contact with the outer surface of the end of the adjacent hull. Such a turning operation of the front hull can be performed in any direction as long as the hull is turned around an axis in the radial direction of the shield body passing through the intersection. Half-fold shield machine of the present invention
In particular, symmetrical positions with the axis of the shield body as the axis of symmetry
Connect the push-side ports of the folding jack
The other half of the selected half-jack
Amount and seam for this selected half-fold jack.
Inside the other symmetrical position with the axis of the body as the axis of symmetry
Control the fold jack independently to match the amount of extension
Control. Therefore, cut the hull ahead
Special control means even if you do not guide with something like a pin
The front hull is provided with a center pin with a simple means without the need for
It can be rotated exactly as in the case of the center folding mechanism.
Wear.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a vertical sectional view of a half-fold shield excavator according to an embodiment of the present invention, and FIG. 2 is a half-fold shield of an embodiment of the present invention showing an arrangement example in which a half-jack is arranged on a shield body. FIG. 3 is a schematic rear view of the excavator, and FIG. 3 is a hydraulic circuit diagram of the half-fold shielded excavator according to the embodiment of the present invention, showing a hydraulic drive circuit for driving the half-jack. In FIG. 1, portions denoted by the same reference numerals as those in FIGS. 4 to 8 represent portions equivalent to those drawings, and thus will not be described in detail to avoid redundant description.

As shown in FIG. 1, in the center folding type shield machine according to the embodiment of the present invention, the rear end of the front hull 4 is rotated with respect to the front outer surface of the rear hull 5 similarly to the conventional one. The shield body is configured to be able to be folded inward by being fitted and connected so that it can move, and the front hull 4 and the rear hull 5 are rotated by the front hull 4 with respect to the rear hull 5. A half-fold jack 1 for driving the shield body half-fold by moving the same is provided in the same manner as a conventional half-fold shield excavator. Also, on the inner surface of the end of the front hull 4,
An intermediate seal 2 is provided on the rear hull 5 to maintain the gap between the rear hull 5 and the end outer surface of the rear hull 5 in a sealed state. A curved surface for sliding the inner surface is formed, and there is no difference in basic configuration from a conventional half-fold shield machine. The half-folding shield machine of the present embodiment is a half-folding shield machine having such a basic configuration, and is similar to the half-folding shield machine of FIGS.
Even if such a device is not provided, the center folding jack 1 is driven while being controlled by a hydraulic drive circuit, thereby providing a center folding mechanism having a center folding mechanism with a center folding pin as shown in FIGS. This enables the front hull 4 to perform the same turning operation as the shield machine.

Therefore, a description will be given of the configuration of the center folding type shield excavator according to this embodiment. First, regarding the shield body, the rear end of the front hull 4 and the front end of the rear hull 5 are shown in FIGS. As in the case of the half-fold shield excavator in FIG. 8, it is not connected with the half-fold pin 3, but is formed on the end outer surface of the rear hull 5 despite being directly connected by the half-fold jack 1. The curved surface has the same curved surface as that of the center folding mechanism with a center folding pin. That is, the curved surface formed on the end outer surface of the rear hull 5 has a spherical surface centered on the intersection O between the center line Y and the shield body axis Z, as in the case of the half-type shield excavator in FIGS. It is processed to have a similar curved surface. Therefore, when the front hull 4 rotates about the axis in the radial direction of the shield main body passing through the intersection O, the inner surface of the end of the front hull 4 contacts the outer surface of the end of the rear hull 5 in any direction. It has become.

Next, a hydraulic drive circuit of the center folding jack 1 will be described with reference to FIG. 2 and FIG.
J1, J2, J3, and J4 are the same jacks as the center-fed jacks 1 and are separately numbered so that their arrangement positions can be distinguished. These mid-fold jacks J
1, J2, J3, and J4 are arranged as shown in FIG. 2 and are provided vertically one by one on the left and right, and there is no difference from the conventional half-fold shield excavator. Middle folding jack J
Each of J1, J2, J3, and J4 has a push-side port on the bottom side, that is, a push side, and a pull-side port on its rod side, that is, a pull side. Each push-side port of the center folding jacks J1 and J2 is a seal
The main body axis Z is connected to each push-side port of the center folding jacks J3 and J4 located at symmetrical positions with respect to the axis of symmetry . In this embodiment, the center folding jacks are arranged as shown in FIG. 2, but the number and arrangement can be appropriately selected in consideration of the diameter of the shield machine, the direction of the center folding, and the like. J1P, J2
P, J3P and J4P are directional switching valves that can be switched from the neutral position shown in FIG. 3 to positions a and b by manual operation or pilot pressure, etc., each input port being connected to the hydraulic pump P and each output port being connected to each other. Each port is a mid-fold jack J
1, J2, J3, and J4 are connected to pulling ports. These directional control valves J1P, J2P, J3P, J4
When any of the P is switched to the position a, the center folding jacks J1 and J are connected through the output port and the tank port.
2, J3, J4 pull-side ports are connected to tank T, b
When the position is switched to the position, the hydraulic pump P is connected to the middle fold jacks J1, J2 and J2 through its input port and output port.
Connect to pulling ports of J3 and J4. In addition, J1C,
J2C is a switching valve capable of supplying the pressurized oil of the pump P to each push-side port of each of the half-jacks J1 and J3 or each push-side port of each of the half-jacks J2 and J4 by appropriately switching. Middle folding jack J1, J2, J3, J
When the neutral position fluctuates due to a leak of 4 or the like, this is operated to correct the neutral position.

Since the center folding type shield machine according to the present embodiment has such a configuration, for example, the directional control valve J1
When P and J2P are switched to the b position and the directional control valves J3P and J4P are switched to the a position , the half-folding jacks J1 and J2 perform the pulling operation and at the same time, each of the half-folding.
Symmetry axis of shield body axis Z with jacks J1 and J2
-Fold jacks J3 and J at symmetrical positions
4 performs a pushing operation. At this time, the middle folding jacks J3 and J4
Push port is to be respectively connected directly to the push port-folding the jack J1, J2, is so by itself controlled so that the amount of elongation-folding the jack J1, J2 shrinkage amount and center-folding jack J3, J4 are matched, As a result, the front hull 4 is centered on the vertical axis on the intersection O between the center line Y and the shield body axis Z, similarly to the center folding mechanism with the center folding pin.
Rotate accurately . As described above, the curved surface formed on the outer surface of the end of the rear hull 5 is processed so as to have the same curved surface as the spherical surface centered at the intersection point O. When rotating, the partial hull 4 slides so that the inner surface of the end contacts the outer surface of the end of the rear hull 5 over the entire circumference. Such a turning operation of the front hull 4 can be performed in any direction as long as the hull 4 is turned around the axis in the radial direction of the shield main body at the intersection O.

According to the center folding type shield excavator of this embodiment, the center folding jack 1 is driven while being controlled by the hydraulic drive circuit, so that the center folding pin 3 does not need to be provided. Also, since the front hull 4 can perform the same rotation operation as the mechanism with the center folding pin, the strength of the shield body middle folding section can be secured as in the conventional mechanism without the center folding pin. However, as in the case of the center folding mechanism with a center folding pin, the center folding portion can be sufficiently sealed and the shield main body can be bent in an arbitrary direction. In the center folding shield machine of this embodiment,
In particular, in a symmetrical position with the shield body axis Z as the axis of symmetry
Connect the push-side ports of a half-fold jack 1
So that one of the selected half-fold jacks 1
Amount and the selected one
The other side in a symmetrical position with the main body axis Z as the axis of symmetry.
To match the amount of elongation of the center folding jack 1
Can be controlled by Therefore, front hull 4
Press the center fold jack 1 without guiding it with the center fold pin 3.
The simple means of connecting the remote ports
How to attach the front hull 3 to the center pin without any additional control means
Rotating movement can be performed exactly as with the center folding mechanism.
You.

[0019]

As will be apparent from the above description, the present invention relates to the structure described in the claims, and more particularly, to a method of forming a curved surface formed on the outer surface of the end of the hull by using the center folding center line and the shield body. Make the curved surface similar to the spherical surface centered on the intersection with the axis, and set the axis of the shield body as the symmetry axis.
Between the push-side ports of the half-fold jack at symmetrical positions.
Connect, when folded in the shield body, of the plurality of center-folding jacks, to a pulling operation to that of the selected one, this
The axis of the shield body is symmetrical with respect to the selected one
Hydraulic pressure for controlling the other hull in a symmetrical position as an axis to perform a pushing operation so that the front hull can rotate around the axis in the radial direction of the shield body passing through the intersection without the center folding pin. is provided with the driving circuit provided "configuration, in a conventional having a center-folding mechanism of the center-folding pinned scheme
Like a folding shield machine, the front hull is
The hull in front, without doing anything
Of the shield body around the radial axis.
Can be. Therefore, concentrated stress is applied to the center folding pin.
It is difficult to secure the strength, or the shield body
Conventional half-fold type seal that is limited to one direction
Does not cause any problems as seen with
Conventional half-fold shield digging with a half-fold type half-fold mechanism
There is no sealing problem as seen in the advance. did
Therefore , according to the present invention, it is possible to ensure the strength of the shield body middle bent portion, and also to sufficiently seal the middle bent portion, and also to be able to be bent in any direction. It is possible to provide a mid-section shield machine which has all the features of conventional various types of mid-section shield machine. In the present invention, in particular, the shield body axis
Side of the center-fold jack located symmetrically with the axis of symmetry as
Because the ports are connected to each other,
The amount of shrinkage of one half-jack and this one selected
For the center folding jack, the shield body axis is
With the extension of the other half-fold jack at the nominal position
It becomes possible to control by itself to make it control. That
Therefore, do not guide the front hull with something like a folding pin.
However, simple means without the need for special control means
The hull in front is the same as the center folding mechanism with a center folding pin
Can be accurately rotated.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a center folding shield machine according to an embodiment of the present invention.

FIG. 2 is a schematic rear view of the center folding type shield excavator according to the embodiment of the present invention, showing an arrangement example in which a center folding jack is arranged on the shield main body.

FIG. 3 is a hydraulic circuit diagram of the half-type shield excavator according to the embodiment of the present invention, showing a hydraulic drive circuit for driving the half-fold jack.

FIG. 4 is a vertical sectional view of a conventional half-fold shield excavator provided with a half-fold mechanism with a half-fold pin.

FIG. 5 is a horizontal cross-sectional view showing a state where the shield is displaced when the center folding type shield machine shown in FIG. 4 is bent at the center.

FIG. 6 is a vertical sectional view of a conventional half-fold shield excavator having a half-folding mechanism without a half-folding pin.

FIG. 7 is a horizontal cross-sectional view showing a state where the shield is displaced when the center folding type shield machine shown in FIG. 6 is bent at the center.

FIG. 8 is a vertical sectional view showing a state after the center folding type shield machine of FIG. 6 is bent.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Folding jack 2 Folding seal 3 Folding pin 4 Front hull 5 Rear hull J1, J2, J3, J4 Center folding jack J1P, J2P, J3P, J4P Direction switching valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E21D 9/06 301-302 E21D 9/06 311

Claims (1)

(57) [Claims] 1. A shield body configured to be able to be bent by fitting and connecting adjacent ends of a plurality of hulls so as to be rotatable with each other, and provided between adjacent hulls and adjacent to each other. A plurality of half-jacks driven to rotate the shield body in the middle by rotating the front hull of the hull with respect to the rear hull, and on the inner surface of the end of the hull fitted together, A buckle seal is provided to keep the gap between the outer surface of the hull end and the outer surface of the hull tight, and the inner surface of the hull end when the shield body is bent at the outer surface of the fitted hull end. In a half-fold shield excavator that forms a curved surface for sliding
The curved surface formed on the outer surface of the end of the hull should be a curved surface similar to a spherical surface centered on the intersection of the center folding center line and the axis of the shield body, and the axis of the shield body should be the axis of symmetry.
Push-side ports of the folding jack in symmetrical positions
When the shield body is bent in the middle, pull the selected one of the multiple folded jacks to the pulling operation.
Align the shield body axis with the one selected
For controlling the other hull in a symmetrical position as the nominal axis to perform a pushing operation so that the front hull can rotate around the axis of the shield body radial direction passing through the intersection without the center folding pin. A half-fold shield excavator equipped with a hydraulic drive circuit.