JPH116390A - Shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the quantity of intermediate folding in the specific direction without increasing the size of the sliding surface of an intermediate folding section in a shield machine. SOLUTION: An intermediate folding section 5 is formed between the front drum 1 and rear drum 2 of a shield body 10, and the intermediate folding section 5 is composed of a sliding surface 4, which is provided to the outer circumference at the front end of the rear drum 2 and has a convex surface, and a ring-shaped sealing section 3 provided to an inner circumference at the rear end section of the front drum 1, in slide contact with the sliding surface 4 and sealing the sliding surface 4. In the intermediate folding section 5, the end face (a rear end face) of the front drum 1 is inclined at an angle α0 toward the front on the left side relative to the direction of travel with respect to the plane perpendicular to the axis Zf of the front drum 1, and the sealing section 3 is formed to the inner circumference of the end face of the front drum 1 so as to be tilted at the same angle α0 at the end face. Intervals a2 , b1 determining a maximum intermediate folding angle θBmax on the left side relative to the direction of travel are made larger than those a1 , b2 determining a maximum intermediate folding angle θAmax on the right side relative to the direction of travel in a state in which the shield body 10 is placed in the posture of rectilinear traveling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine and, more particularly, to a shield machine in which a shield body is divided into a front body and a rear body, and the front body and the rear body are rotatably connected. About.

[0002]

2. Description of the Related Art When excavating a curved tunnel with a shield machine, it is necessary to change the direction of the shield machine. In particular, recently, excavation work has concentrated in urban areas, and in this case, there are various restrictions on excavating underground shafts, so the demand for shield excavators that can not only go straight but also turn around has increased rapidly. I have. As such a shield machine, there is a half-fold shield machine in which a shield body is divided into a front body and a rear body, and the front body and the rear body are rotatably connected. FIGS. 6 to 8 show an example of this conventional half-fold shield excavator.

In FIGS. 6 and 7, a shield body 50 is shown.
Is divided into a front trunk 51 and a rear trunk 52, and a center fold 55 is provided between the front trunk 51 and the rear trunk 52. The center folded portion 55 is provided on the outer periphery of the front end of the rear trunk 52 and has a spherical surface formed thereon, and is provided on the inner periphery of the rear end of the front trunk 51 and slidably contacts the sliding surface 62. And a ring-shaped seal portion 61 for sealing the seal. The rear end surface of the front trunk 51 (the rear end surface of the seal portion 61) is orthogonal to the axis Zf of the front trunk 51. Between the rear end of the front trunk 51 and the front end of the rear trunk 52, as shown in FIG.
3b, 53c, 53d are connected in the circumferential direction.

When the center folding section 55 is to be folded in the middle of the straight traveling posture as shown in FIG. 9 (a) to perform a curved construction, the middle folding jacks 53a to 53d are used.
To rotate the front trunk 51 with respect to the rear trunk 52. For example, as shown in FIG. 9B, when the middle folding section 55 is to be folded rightward (upward in the drawing) in the traveling direction, the middle folding jack 53 is used.
The front body 51 is rotated upward with respect to the rear body 52 with respect to the rear body 52 by retracting the center folding jacks 53c and 53d while contracting the a and 53b. When the center folding section 55 is to be folded to the left (downward in the drawing) in the traveling direction as shown in FIG. 9C, the center folding jacks 53a and 53b are extended and the center folding jacks 53c and 53c are extended.
By contracting 3d, the front trunk 51 is rotated downward with respect to the rear trunk 52 in the figure.

[0005]

However, the above prior art has the following problems. When performing curved construction with the shield body folded in the middle, the maximum curvature of the tunnel to be excavated is not always the same in the left and right directions or in the upward and downward directions, and as equipment on the shield machine In many cases, it is sufficient to increase the amount of half-fold (half-fold angle) only in a specific direction.

In the conventional shield machine, since the rear end face of the front body 51 is orthogonal to the axis Zf of the front body 51 as described above, the shield body 50 is in a straight forward posture (see FIG. 7). ), The rear end face of the front trunk 51 (the seal portion 6)
Distance a ₁ between the proximal end t ₁ of the sliding surface 62 of one of the rear end surface) s ₁ and the rear cylinder 52 is constant over the entire circumference, the distal end surface of the front end surface s ₃ and the sliding surface 62 of the sealing portion 61 The distance b _{1 from} t ₃ is also constant over the entire circumference. As a result, the slidable distance of the seal portion 61 with respect to the sliding surface 62 is a ₁ , b ₁ on both the base end side and the distal end side of the sliding surface 62. And is constant over the entire circumference. Since the maximum folding angle α _max of the folding part 55 is determined by the slidable distances a ₁ and b _{1 of the} seal part 61,
The maximum in the diffraction angle of theta _max of the same in all directions.

In such a conventional shield machine, if the maximum half angle θ _max of the half section 55 in a specific direction is to be increased, the intervals a ₁ and b ₁ are reduced as shown by dotted lines in FIG. In this case, the sliding surface 62 must be large.
Becomes longer in the direction of the axis Zb, and the strength is unreasonable. In addition, the machine length of the shield body 50 becomes longer, and problems such as an increase in frictional force during excavation and an increase in the amount of extra excavation during construction of a curved line occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shield machine capable of increasing the amount of folding in a specific direction without increasing the length of the sliding surface of the folding section.

[0009]

[Means for Solving the Problems]

(1) In order to achieve the above object, the present invention provides a sliding surface at one of a rear end of a front trunk and a front end of a rear trunk, and a seal portion slidingly contacting the sliding surface at the other. In the shield machine where the front surface and the rear body are rotatably connected to each other, the seal part of the rear end of the front body and the front end of the rear body is provided. The end face of the side end is inclined by a predetermined angle with respect to the plane perpendicular to the axis of the end.

By inclining the end surface on the seal portion side at a predetermined angle in this manner, the distance between the seal portion and the base end of the sliding surface or the distance between the seal portion and the distal end of the sliding surface can be reduced. In the specific direction corresponding to the direction, the slidable distance of the seal part also increases in the specific direction, so that the maximum length in the specific direction can be increased without increasing the length of the sliding surface of the center folded part. The amount of folding can be increased.

(2) In the above (1), for example, the seal portion is provided on an inner periphery of a rear end of the front trunk, and the sliding surface is provided on an outer periphery of a front end of the rear trunk.

(3) In the above (1), preferably, the front torso is joined to the main body frame in which the rear body side end face is inclined at a predetermined angle with respect to the plane orthogonal to the axis, and the rear body side end face. And an end frame whose both end surfaces are orthogonal to the axis, and the seal portion is mounted on the inner peripheral surface of the end frame.

As a result, the seal portion is previously bent along the sliding surface with respect to the center of the sliding surface, so that the center of the curved surface of the seal portion coincides with the center of the sliding surface. There is no gap between the seal portion and the sliding surface, and the sealability of the seal portion is not impaired.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, the shield machine according to the present embodiment has a shield body 10, and the shield body 10 includes a front body 1 and a rear body 2. A cutter 8 is installed at the forefront of the front body 1, and the cutter 8 is driven by a rotation mechanism 7 including a rotation motor, and excavates soil in front. The earth and sand excavated by the cutter 8 is sent backward by the screw conveyor 9.

A half-folded portion 5 is provided between the front body 1 and the rear body 2, and the center-folded portion 5 is provided on the outer periphery of the front end of the rear body 2 and is provided with a spherically worked slide. It comprises a moving surface 4 and a ring-shaped seal portion 3 provided on the inner periphery of the rear end of the front body 1 and slidingly contacting the sliding surface 4 to seal it. As shown in FIG. 4, four center folding jacks 13a, 13b, 13c and 13d are connected in the circumferential direction between the front trunk 1 and the rear trunk 2.

In the center folding section 5, the end face (rear end face) of the front body 1 is viewed from the top view of FIG.
It is inclined at an angle α ₀ forward to the left in the traveling direction with respect to the orthogonal plane of f, and a seal portion 3 is provided on its inner periphery so as to be inclined at the same angle α ₀ as the end surface.

Here, the front body 1 has a body frame 1A whose end surface on the side of the rear body 2 is inclined at an angle α ₀ with respect to a plane perpendicular to the axis.
And an end frame 1B whose both end surfaces are orthogonal to the axis and whose interval is substantially equal to the width of the seal portion 3. The seal portion 3 is mounted on the inner peripheral surface of the end frame 1B, and the main body frame 1A The two are integrated by welding the end surface of the end frame 1B to the inclined side end surface. By doing so, the seal portion 3 is previously bent along the sliding surface 4 with respect to the center O of the sliding surface 4, so that the center of the curved surface of the seal portion 3 is the center of the sliding surface. O, so that there is no gap between the seal portion 3 and the sliding surface 4, and the sealing performance of the seal portion 3 is not impaired.

In the present invention, as described above, the front body 1
Of the shield body 1 as a result of inclining the rear end face at an angle α ₀
0 is in a straight-ahead posture (FIG. 2), the distance a ₁ between the rear end surface (rear end surface of the seal portion 3) s ₁ of the front body 1 on the right side in the traveling direction and the base end t ₁ of the sliding surface 4. Is the distance a ₂ between the rear end surface of the left front body 1 (rear end surface of the seal portion 3) s ₂ and the base end t ₂ of the sliding surface 4.
And the tip surface t of the sliding surface 4 on the right side in the traveling direction.
₃ and distance b ₁ between the front end surface s ₃ of the seal portion 3 is larger than the distance b ₂ between the front end surface s ₄ of the distal end surface t ₄ and the seal portion 3 of the left side of the sliding surface 4.

In the present embodiment configured as described above, when the half-folding section 5 is to be half-folded in order to perform curved construction,
The operation is performed by operating the center folding jacks 13a to 13d in the same manner as in the related art. For example, when the center folding section 5 is to be folded rightward (upward in the drawing) in the traveling direction as shown in FIG. 5B, the center folding jacks 13a and 13b are contracted, and the center folding jacks 13c and 13d are stretched. The body 1 is rotated upward with respect to the rear body 2 in the figure. When the center folding section 5 is to be half-folded to the left (downward in the drawing) in the traveling direction as shown in FIG. 5 (c), the middle folding jacks 13a and 13b are extended and the middle folding jacks 13c and 13c are extended.
By reducing d, the front body 1 is rotated downward with respect to the rear body 2 in the figure. Although not shown, when the center folding section 5 is to be folded in the upper direction in the traveling direction, the center folding jack 13a,
When the front body 1 is rotated upward with respect to the rear body 2 by retracting the center folding jacks 13b and 13c by retracting the center folding jacks 13b and 13c, the center folding jacks 13a, The front body 1 is rotated downward with respect to the rear body 2 by extending 13d and contracting the center folding jacks 13b and 13c.

As described above, when the half-folding portion 5 is to be half-folded,
Sealing part 3 for folding the middle folding part 5 rightward in the traveling direction
Sliding distance is the spacing a ₁ or b ₂ of the shown in Figure 2, the sliding distance of the sealing portion 3 at which to center-folding the center-folding unit 5 in the traveling direction left above shown in Figure 2 Interval a ₂ or b ₁
As described above, the rear end face of the front body 1 is inclined at an angle α ₀ , the interval a ₂ is larger than the interval a ₁ , and the interval b ₁ is larger than the interval b ₂ , so that the left side in the traveling direction The slidable distance when making a middle fold becomes larger than the slidable distance when making a middle fold to the right in the traveling direction, and the maximum fold angle θ _Bmax on the left in the traveling direction becomes the maximum fold angle θ _Amax on the right in the traveling direction. Larger than. Therefore, it is possible to excavate a tunnel having a larger curvature on the left side in the traveling direction than on the right side in the traveling direction.

As described above, in the present embodiment, the maximum amount of center folding on the left side in the traveling direction is increased by inclining the rear end surface of the front body 1 at an angle α ₀ with respect to the plane orthogonal to the axis Zf. Therefore, in order to increase the maximum folding amount, the axis Zb of the sliding surface 4
It is not necessary to increase the length in the direction, and it is possible to make the center folding structure advantageous in strength and compact. Further, since the machine length of the shield body 10 does not become long, an increase in frictional force when excavating, an increase in the amount of extra excavation during curve construction, and the like do not occur.

Further, the front body 1 is composed of the main body frame 1A and the end frame 1B so that the center of the curved surface of the seal portion 3 coincides with the center O of the sliding surface. There is no gap between the moving surface 4 and the sealability of the seal portion 3 can be sufficiently ensured.

In the present embodiment, the rear end face of the front body 1 is inclined forward and leftward in the traveling direction to increase the maximum folding angle θ _Bmax on the left side in the traveling direction. It can be arbitrarily determined according to the curve.

Also, a case has been described where a seal portion is provided on the inner peripheral surface of the rear end of the front body and a sliding surface is provided on the outer peripheral surface of the front end of the rear body. Provided with a sliding surface at the rear end of the front fuselage, a seal portion provided on the outer peripheral surface of the rear end of the front trunk, and a sliding surface provided on the inner peripheral surface of the front end of the rear trunk. The present invention can be similarly applied to such a device, and a similar effect can be obtained.

[0025]

According to the present invention, it is possible to increase the amount of half-folding in a specific direction without increasing the size of the sliding surface, and to provide a compact half-folding structure advantageous in strength. it can. In addition, since the length of the shield body does not increase, there is no increase in frictional force during excavation or increase in the amount of extra excavation during curve construction.

[Brief description of the drawings]

FIG. 1 is a top view of a shield machine with a center fold according to an embodiment of the present invention.

FIG. 2 is a horizontal sectional view of the shield machine shown in FIG.

FIG. 3 is a vertical sectional view of the shield machine shown in FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a diagram showing a state of the shield machine shown in FIG.

FIG. 6 is a top view of a conventional shield excavator with a center folding.

FIG. 7 is a horizontal sectional view of the shield machine shown in FIG. 6;

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

FIG. 9 is a view showing a state in which the shield machine shown in FIG. 6 is folded rightward and leftward in the traveling direction.

10 is a view showing the shield machine when the maximum folding angle of the folding section shown in FIG. 7 is increased.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front trunk 1A Main body frame 1B End frame 2 Rear trunk 3 Sealing part 4 Sliding surface 5 Folded part 10 Shield body

Claims (3)

[Claims] 1. A sliding surface is provided at one of a rear end of a front body and a front end of a rear body, and a seal portion is provided on the other side for sliding contact with the sliding surface.
In a shield machine in which the sliding surface and the seal portion constitute a half-folded portion and the front trunk and the rear trunk are rotatably connected, the seal part of the rear end of the front trunk and the front end of the rear trunk is provided. A shield machine wherein the end surface of the end on the side provided is inclined at a predetermined angle with respect to a plane orthogonal to the axis of the end. 2. The shield machine according to claim 1, wherein
The shield machine according to claim 1, wherein the seal portion is provided on an inner periphery of a rear end of the front trunk, and the sliding surface is provided on an outer periphery of a front end of the rear trunk. 3. The shield machine according to claim 1, wherein
The front body, the rear body side end surface is configured by a main body frame inclined at a predetermined angle with respect to the axis orthogonal to the center axis, and an end frame joined to the rear body side end face and both end faces orthogonal to the axis, A shield machine wherein the seal portion is mounted on an inner peripheral surface of the end frame.