JP3498687B2 - Tail clearance measuring device for 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 tail clearance measuring device for a shield machine, and more particularly to a tail clearance measuring device for a shield machine, which can automatically measure the tail clearance with a small device. It is a thing.

[0002]

2. Description of the Related Art A shield machine has been conventionally used to dig a tunnel in the soil.

The shield machine, as shown in FIG.
A disk-shaped cutter 2 is rotatably attached to the tip end surface of a substantially cylindrical shield frame 1 via a driving device 3 such as a motor and gears 4 and 5, and the cutter 2 is rotated to remove soil. When excavating, an arc-shaped segment 7 made of concrete or the like is circularly assembled in the excavation mine 6 excavated by the cutter 2 by a segment assembling device (not shown) provided inside the shield frame 1 to form a concrete tunnel. 8 is constructed, and further the reaction force is supported by the tip of the existing portion of the tunnel 8 by the shield jack 9 provided inside the shield frame 1 to propel the shield frame 1.

In the figure, 10 is a rod portion of the shield jack 9 and 11 is a shoe portion of the shield jack 9.

In the shield machine, the outer diameter of the tunnel 8 or the existing segment 7 is set to be slightly smaller than the inner diameter of the shield frame 1, and the inner diameter surface 1a of the shield frame 1 and the existing segment 7 are set. Between the outer diameter surface 7a and the outer diameter surface 7a (tail clearance 12)
To form the shield frame 1 by earth pressure, etc.
When the shield frame 1 is deformed, the assembled segment 7 is not a perfect circle, or the shield frame 1 approaches one side due to a curve, etc. It is designed so as not to interfere with the segment 7 and not be able to proceed with excavation.

During the excavation, the tail clearance 1
If 2 becomes smaller than the allowable value, the tail clearance 12 is adjusted by changing the direction of the shield frame 1 or inserting a segment having a shape different from that of the normal segment 7. I'm trying to get it back.

Conventionally, the tail clearance 12 between the shield frame 1 and the existing segment 7 has been measured manually by a worker using a ruler to measure four points such as up, down, left and right.

[0008]

However, the means for manually measuring the tail clearance using a ruler has the following problems.

That is, it is a difficult task for a worker to manually measure the tail clearance 12 by using a ruler, and in particular, when the shield excavator has a large diameter as in recent years, it only reaches the measurement point. But it takes a lot of time.

Further, when the tail clearance 12 is manually measured using a ruler, it is impossible to constantly monitor the tail clearance 12, and the change in the tail clearance 12 during propulsion is continuously monitored. I couldn't monitor it.

On the other hand, it has been considered to equip the shield frame 1 of the shield machine with a measuring device capable of automatically measuring the tail clearance 12.
The portion for measuring the tail clearance 12 is a very narrow place where a large number of shield jacks 9 are arranged. Moreover, in order to measure the tail clearance 12, a pressing operation of pressing the measuring device against the shield frame 1, a tail clearance The measurement device is complicated and large in size because it requires an operation such as push-pull operation for inserting / removing the tracing stylus into / from the tail clearance 12 and measurement operation for moving the tail clearance tracing stylus to measure the tail clearance 12.
Therefore, it has been difficult to develop a device that can automatically measure the tail clearance 12.

In view of the above situation, it is an object of the present invention to provide a tail clearance measuring device for a shield machine, which can automate the measurement of the tail clearance with a small device.

[0013]

SUMMARY OF THE INVENTION The present invention provides a measuring device for measuring a tail clearance between a shield frame and an outer surface of an existing segment by directly contacting a tail clearance probe. A tail clearance measuring device for a shield machine equipped with a moving device provided for the shield machine so as to be able to move toward and away from the front end of an existing segment, and the measuring device has a tail clearance probe at one end. The tubular main body is supported by the positioning mechanism so as to be positionable with respect to the moving device, and a push-pull device for pushing and pulling the tail clearance measuring element back and forth and a tail clearance measuring element are provided inside the cylindrical main body. It is equipped with a rotation drive device that rotates and a detector that detects the rotation of the tail clearance probe.
And the positioning mechanism uses an elastic body for the moving device.
Support frame urged to the outside of the shield frame in the radial direction
And a rocker supported so that it can be tilted back and forth with respect to the support base.
The moving frame and the tubular body fall onto the swing frame
The holding arm and the cylindrical body that support not to rotate can be rotated.
The support roller that supports the performance and the tubular body shield the frame.
A tail clearance measuring device for a shield machine, comprising: a support leg that is supported on an inner diameter surface of the hole.

In the above means, the tail clearance measuring element may have a substantially L shape.

[0015]

Further, the elastic body may be a compression spring,
Further, the supporting legs may be provided at two positions on the outer peripheral surface on one end side and one position on the outer peripheral surface on the other end side of the cylindrical body to support three points.

Further, a tail clearance measuring element arranged outside one end of the tubular body is fixed inside the tubular body, and a sliding shaft movable in the axial direction of the tubular body and the sliding shaft are pushed. A slide piston for pulling, a rotary motor having a drive shaft connected to the slide shaft via a spline, and a detector connected to the drive shaft of the rotary motor to detect rotation may be provided.

Further, a tail clearance measuring element arranged outside one end of the tubular body is fixed inside the tubular body, and a sliding shaft movable in the axial direction of the tubular body and the sliding shaft are pushed. A pulling slide piston, a rotary motor whose drive shaft is connected to the sliding shaft and is movable in the axial direction of the tubular body together with the sliding shaft, and rotation is detected by connecting to the drive shaft of the rotary motor. It may be provided with a detector.

Further, the moving device may be a shoe portion of the shield jack.

According to the above means, the following effects can be obtained.

A tubular body, which can be positioned with respect to the inner diameter surface of the shield frame, is supported by the moving device through a positioning mechanism, and a substantially L-shaped tail clearance measuring element is provided on the tubular body. Since the tail clearance is measured by inserting and removing the tail clearance measuring element and rotating the tail clearance measuring element, the measurement of the tail clearance can be automated and reliable measurement can be performed.

Further, a push-pull device for pushing and pulling the tail clearance measuring element back and forth, a rotary driving device for rotationally driving the tail clearance measuring element, and a detector for detecting the rotation of the tail clearance measuring element are provided in a tubular body. Since the measuring device can be miniaturized, the measuring device can be easily installed in a narrow space in the shield machine.

If the measuring device is attached to the shoe portion of the shield jack closest to the segment, the attachment becomes simple and the structure for attachment can be simplified and downsized.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an example of the embodiment of the present invention.

Since the basic structure of the shield machine is the same as that of FIG. 7, reference will be made to FIG. 7 as necessary, and the same parts will be described with the same reference numerals. Omit it.

In the present invention, a tail clearance measuring element capable of directly measuring the tail clearance 12 between the inner diameter surface 1a of the shield frame 1 and the outer diameter surface 7a of the existing segment 7 shown in FIG. A measuring device 14 having 13 at one end side is supported by a moving device 16 so that the measuring device 14 can move in the front-rear direction 15 and move toward and away from the front end of the existing segment 7. There is.

As the moving device 16, a dedicated cylinder or the like may be newly provided inside the shield frame 1, but as shown in FIG. 1, the existing shield jack 9 can be used as it is.

For example, when the shield jack 9 is used as the moving device 16, the fixed bracket 17 is attached to the shoe portion 11 of the shield jack 9, and the measuring device 14 is supported by the fixed bracket 17 via the positioning mechanism 19. (Alternatively, a clamp tool may be attached to the rod part 10 of the shield jack 9 and the measuring device 14 may be supported by the arm part fixed to the clamp tool).

2 to 4 show the details of the measuring device 14. The measuring device 14 includes a substantially cylindrical tubular main body 18 having a substantially L-shaped tail clearance measuring element 13 at one end, and the tubular main body 18 includes a positioning mechanism 19 to fix the moving device 16. It is supported by the bracket 17 and can be positioned with respect to the shield frame 1.

That is, the positioning mechanism 19 includes the moving device 16
Support pedestal 21 urged radially outward of the shield frame 1 by the elastic body 20 with respect to the fixed bracket 17 of
And a swing frame 23 supported by a swing pin 22 so as to be tiltable back and forth with respect to the support base 21. In the example of the figure, a case where a compression spring is used for the elastic body 20 is shown. The support base 21 includes a fixed bracket 17
On the other hand, the guide rod 20a can move only in the vertical direction.

Further, front and rear of the swing frame 23, a holding arm 24 for holding and supporting the cylindrical main body 18 so as not to fall radially outward, and two front and rear radial inner portions.
A receiving roller 25 that rotatably supports the tubular body 18 at points.
It has and. At this time, on the outer peripheral surface of the cylindrical main body 18,
Guide groove 26 in which the receiving roller 25 and the holding arm 24 are fitted
Is formed. Further, support legs 27a, 27b, and 27c are provided at two locations on the outer peripheral surface on one end side of the tubular body 18 and on one location on the outer peripheral surface on the other end side of the tubular body 18, and these support legs 27a, 27b, The cylindrical body 18 is positioned on the inner diameter surface 1a of the shield frame 1 by three-point support by 27c.

Inside the tubular main body 18, as shown in FIG. 4, a push-pull device 28 for pushing and pulling the tail clearance measuring element 13 back and forth, and a tail clearance measuring element 13 are provided.
And a detector 30 for detecting the rotation of the tail clearance measuring element 13.

More specifically, the sliding shaft 3 which is movable in the axial direction of the tubular body 18 is provided inside one end of the tubular body 18.
1 is provided at the outer end of the sliding shaft 31, and an arm 13a extending radially outward and a detection needle 1 extending in a direction parallel to the sliding shaft 31 at the tip of the arm 13a.
3b and a substantially L-shaped tail clearance probe 1
3 is fixed. The tail clearance probe 1
The detection needle 13b of No. 3 has the support legs 27a, 27b, 27.
It is designed to project further outward (lower side) from the lower surface of c.

Inside the tubular body 18, the air injection chamber 3
A slide piston 34 is provided as a push / pull device 28 fixed to the slide shaft 31 so that the tail clearance measuring element 13 can be inserted / removed in the front-rear direction by injecting and discharging air to the nozzles 2, 33. Reference numerals 35 and 36 are air supply / discharge ports, and 37 is a limit switch for detecting the position of the slide piston 34.

Further, the air injection chamber 32 inside the tubular body 18
A rotation motor 38 as a rotation drive device 29 is provided at the rear part.
Is fixed, and a drive shaft 40 of the rotary motor 38 having a spline 39 is concentrically fitted to the sliding shaft 31. As a result, the drive shaft 40 and the sliding shaft 31 can slide and rotate integrally with each other. Further, a detector 30 for detecting rotation is connected and arranged to a coaxial shaft 41 projecting opposite to the drive shaft 40 of the rotary motor 38. As the detector 30 that detects rotation, a potentiometer, a rotary encoder 42, or the like can be used.

Further, instead of the structure shown in FIG. 4, the drive shaft 40 of the rotary motor 38 is directly connected to the sliding shaft 31, and the rotary motor 38 is operated by the action of the slide piston 34.
May be configured to be moved in the front-rear direction together with the sliding shaft 31.

Next, the operation will be described.

The process of constructing the tunnel while the shield machine is excavating is the same as in the case of FIG. 7, and therefore its explanation is omitted.

In the present embodiment, when measuring the tail clearance 12 between the inner diameter surface 1a of the shield frame 1 and the outer diameter surface 7a of the existing segment 7, a dedicated cylinder (not shown) is used as the moving device 16. in case of,
A moving device 1 such as a cylinder that extends the cylinder to move it.
The measuring device 14 attached to 6 is brought close to the front end of the existing segment 7, and then the tail clearance measuring element 13 of the measuring device 14 is inserted into the tail clearance 12.

Further, when the existing shield jack 9 is used as it is as the moving device 16, the shield jack 9 is normally extended so that the reaction force is supported on the front end portion of the existing segment 7. Therefore, the tail clearance measuring element 13 of the measuring device 14 attached to the shoe portion 11 naturally comes close to the existing segment 7 as shown in FIG. unnecessary. At this time, the position of the detection needle 13b of the tail clearance measuring element 13 is normally made to stand by so as to be at an intermediate position of the tail clearance 12 as shown by A in FIG. And so as not to contact the segment 7.

The cylindrical main body 18 is constantly pressed against the inner diameter surface 1a of the shield frame 1 by the elastic body 20 by the crimping spring shown in FIGS.
The tubular body 18 moves along the inner diameter surface 1a of the shield frame 1 due to the movement of the shield frame 1 due to the expansion of the shield frame 1 and the reduction of the shield jack 9 itself. At this time,
The cylindrical main body 18 can freely tilt back and forth by a swing frame 23 supported by a swing pin 22, and can freely rotate by a holding arm 24 and a receiving roller 25. Support legs 27a, 27b, 2
Since it is supported by 7c, the cylindrical main body 18 pressed by the elastic body 20 composed of a compression spring is
Three-point support by the support legs 27a, 27b, 27c ensures positioning with respect to the inner diameter surface 1a of the shield frame 1.

Subsequently, by the push / pull device 28 shown in FIG.
The tail clearance gauge 13 is extended from the solid line position shown in FIG. 2 to the two-dot chain line position. In the example of FIG. 4, air is injected into the air injection chamber 32 to move the slide piston 34 to the right. As a result, as shown in FIG. 2, the detection needle 13b of the tail clearance measuring element 13 is inserted into the tail clearance 12 between the inner diameter surface 1a of the shield frame 1 and the outer diameter surface 7a of the segment 7. .

Next, the rotary motor 38, which is the rotary drive device 29 of FIG. 4, is driven to rotate the tail clearance measuring element 13, and the detection needle 13b is moved to the inner diameter surface of the shield frame 1 as shown in FIG. 5B. Adhere to 1a. The rotation angle of the rotary motor 38 at this time is detected by the potentiometer or the rotary encoder 42 which is the detector 30. At this time, since the drive shaft 40 of the rotary motor 38 and the sliding shaft 31 are fitted through the spline 39, even if the tail clearance measuring element 13 is pushed or pulled, the rotary motor 3
The rotational force of 8 can always be transmitted to the sliding shaft 31.

Then, the rotary motor 38 is driven to rotate the tail clearance measuring element 13 in the opposite direction to the above, and the detection needle 13b is moved to the segment 7 as shown in FIG. 5C.
To the outer diameter surface 7a. The rotation angle of the rotary motor 38 at this time is detected by the potentiometer or the rotary encoder 42 which is the detector 30. The rotating motor 38 during the measurement follows the change in the tail clearance 12 by controlling so that the same torque is always generated.

Next, the principle of measuring the tail clearance will be described with reference to FIG.

As shown in FIG. 4, since the tubular main body 18 is pressed against the inner diameter surface 1a of the shield frame 1 by the three-point support by the support legs 27a, 27b, 27c, the tail clearance measuring element 13 The distance H between the rotation center X and the inner diameter surface 1a of the shield frame 1 is always constant, and this distance H is known from the design dimension.
Therefore, as shown by the solid line in FIG. 6, the detection needle 13b of the tail clearance probe 13 is connected to the inner diameter surface 1a of the shield frame 1.
Angle with respect to the horizontal line (θ = 0 °) when abutting against
₁ is always constant. At this time, the curvature of the inner diameter surface 1a of the shield frame 1 changes depending on the machine diameter, but is within an error range in measuring the tail clearance 12. on the other hand,
When the angle θ ₁ is changed, it indicates that the curvature is changed. Therefore, the change in the angle θ ₁ can correct the distance H due to the difference in the curvature.

Subsequently, the tail clearance measuring element 13 is rotated so that the detecting needle 13b is attached to the outer diameter surface of the segment 7a by 7a.
The angle θ ₂ with the horizontal line at this time
To detect.

Then, since the dimension L between the rotation center X of the tail clearance measuring element 13 and the detecting needle 13b is known, Lsin θ ₂ to 1/2 of the needle diameter of the detecting needle 13b.
The distance between the rotation center X of the tail clearance measuring element 13 and the outer diameter surface 7a of the segment 7 can be obtained by subtracting the length of

Therefore, the tail clearance 12 is

## EQU1 ## 12 = H- {Lsin θ ₂ −1/2 of the needle diameter of the detection needle 13b}.

As described above, according to this embodiment,
The inner surface 1a of the shield frame 1 with respect to the moving device 16
A cylindrical main body 18 that can be positioned with respect to the main body is supported via a positioning mechanism 19, and the cylindrical main body 18 is provided with a substantially L-shaped tail clearance measuring element 13. Since the tail clearance 12 is measured by performing the rotation, the tail clearance can be automated and reliably measured.

Further, as described above, the push / pull device 28 for pushing and pulling the tail clearance measuring element 13 back and forth,
Since the rotation driving device 29 that rotationally drives the tail clearance measuring element 13 and the detector 30 that detects the rotation of the tail clearance measuring element 13 are provided inside the tubular main body 18 and coaxially, The measuring device 14 can be miniaturized, and thus the measuring device 14 can be easily installed in a narrow space in the shield machine.

If the measuring device 14 is attached to the shoe portion 11 of the shield jack 9 which is closest to the segment 7, the attachment is simplified and the structure for the attachment can be simplified and downsized.

Since the tail clearance 12 is measured by directly contacting the inner diameter surface 1a of the shield frame 1 and the outer diameter surface 7a of the existing segment 7, the tail clearance 12 is measured. With high certainty, high-precision detection is possible.

Further, the tail clearance 12 is continuously measured except when the shield jack 9 and the moving device 16 such as a cylinder (not shown) are temporarily retracted in order to install a new segment 7 in front of the existing segment 7. It is possible to continue.

The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0057]

As described above, according to the tail clearance measuring device for a shield machine of the present invention, the cylindrical main body which can be positioned with respect to the inner surface of the shield frame with respect to the moving device is positioned by the positioning mechanism. Since the tail clearance measuring element is supported by the cylindrical body and provided with a substantially L-shaped tail clearance measuring element, and the tail clearance measuring element is inserted and removed and rotated, the tail clearance is measured. Has the effect of automating and reliably measuring.

Further, a push-pull device for pushing and pulling the tail clearance measuring element back and forth, a rotary driving device for rotationally driving the tail clearance measuring element, and a detector for detecting the rotation of the tail clearance measuring element are provided in a tubular body. The measuring device can be downsized, and therefore, the measuring device can be easily installed in a narrow space in the shield machine.

If the measuring device is attached to the shoe portion of the shield jack which is closest to the segment, there is an effect that the attachment is simplified and the structure for the attachment can be simplified and downsized.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a side view of the measuring device of FIG. 1 viewed from a II-II direction.

FIG. 3 is a front view of FIG. 2 viewed from a III-III direction.

4 is a cross-sectional view of the tubular main body of FIG.

FIG. 5 is a front view showing a state in which the tail clearance is measured by a tail clearance gauge.

FIG. 6 is an explanatory diagram showing the measurement principle of tail clearance.

FIG. 7 is a schematic side sectional view of a shield machine.

[Explanation of symbols]

1 shield frame 1a Inner surface 7 segments 7a outer diameter surface 9 shield jack 11 Shoe section 12 tail clearance 13 Tail clearance probe 14 Measuring device 16 Moving device 18 tubular body 19 Positioning mechanism 20 Elastic body (crimp spring) 21 Support stand 23 Swing frame 24 holding arm 25 receiving roller 27a, 27b, 27c Support legs 28 Push and pull device 29 rotary drive 30 detector 31 sliding axis 34 Slide piston 38 rotation motor 39 splines 40 drive shaft

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-11-62471 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/00 E21D 9/06

Claims (7)

(57) [Claims] 1. A shield excavator equipped with a measuring device for measuring a tail clearance between a shield frame and an outer surface of an existing segment by directly contacting a tail clearance probe with the shield inner surface. A tail clearance measuring device for a shield machine equipped with a device capable of approaching and separating from the front end of an existing segment, wherein the measuring device is a tubular body having a tail clearance measuring element at one end A push-pull device that is supported so as to be positionable with respect to the moving device, and that pushes and pulls the tail clearance measuring element back and forth inside the tubular body; and a rotation driving device that rotationally drives the tail clearance measuring element. A positioning device for detecting the rotation of the tail clearance measuring element,
However, the diameter of the shield frame is
The support base biased outward in the direction
The rocking frame supported so as to be tiltable in the front-back direction and the rocking frame.
Protect the tubular body against falling
A receiving roller that rotatably supports the holding arm and the tubular body.
And a support that supports the tubular body on the inner diameter surface of the shield frame.
A tail clearance measuring device for a shield machine, which is composed of a leg . 2. The tail clearance measuring device for a shield machine according to claim 1, wherein the tail clearance measuring element has a substantially L shape. 3. The tail clearance measuring device for a shield machine according to claim 1 , wherein the elastic body is a compression spring. 4. A support leg is provided on the outer peripheral surface of one end side of the cylindrical main body.
The tail clearance measuring device for a shield machine according to claim 1 or 3 , wherein the tail clearance measuring device is provided at one location and at one location on the outer peripheral surface on the other end side to support at three points. 5. The inner surface of the shield frame and the existing segment
Tail clearance probe on both the outer surface of the
Measure the tail clearance between them by making direct contact
The measuring device is already installed by the moving device equipped with the shield machine.
It is equipped so that it can move toward and away from the front end of the installed segment.
It is a tail clearance measuring device for shield machine
The measuring device has a tail clearance probe at one end.
The cylindrical body that has been
It is supported so that it can be positioned, and inside the tubular body
Push the tail clearance probe back and forth to the
Rotating drive of push-pull device and tail clearance probe
Rotation drive device and rotation of the tail clearance probe
Equipped with a detector for detecting
A sliding shaft that is movable in the axial direction of the tubular body, to which a tail clearance probe arranged outside one end of the tubular body is fixed, a slide piston that pushes and pulls the sliding shaft, and a drive shaft through a spline. a rotary motor coupled to said sliding shaft Te, it tail clearance measuring device features and to Resid Rudo excavator to which a detector for detecting the rotation and connected to a drive shaft of the rotary motor. 6. The inner surface of the shield frame and the existing segment
Tail clearance probe on both the outer surface of the
Measure the tail clearance between them by making direct contact
The measuring device is already installed by the moving device equipped with the shield machine.
It is equipped so that it can move toward and away from the front end of the installed segment.
It is a tail clearance measuring device for shield machine
The measuring device has a tail clearance probe at one end.
The cylindrical body that has been
It is supported so that it can be positioned, and inside the tubular body
Push the tail clearance probe back and forth to the
Rotating drive of push-pull device and tail clearance probe
Rotation drive device and rotation of the tail clearance probe
Equipped with a detector for detecting
A sliding shaft that is movable in the axial direction of the tubular body, to which a tail clearance probe disposed outside one end of the tubular body is fixed, a slide piston that pushes and pulls the sliding shaft, and a drive shaft that slides A rotary motor that is coupled to the shaft and is movable in the axial direction of the tubular body together with the sliding shaft; and a detector that is connected to the drive shaft of the rotary motor to detect rotation. tail clearance measurement device to Resid Rudo excavator. 7. A mobile device, the tail clearance measuring device according to claim 1 or 2 SL placing the shield machine characterized in that it is a shoe portion of the shield jacks.