JP2598679Y2 - Tail clearance measuring device - 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 measuring a tail clearance between an inner surface of a tail frame of a shield machine and an outer surface of a segment assembled in the tail frame.

[0002]

2. Description of the Related Art In a shield machine, a plurality of shield jacks provided around a cylindrical tail frame are advanced rearward, and the tip of each jack (jack shoe) is assembled rearward in the tail frame. The segment is brought into contact with the end face of the segment, and digs forward by using this as a reaction force. In this type of shield excavator, curve excavation is performed by changing the extension stroke of each shield jack or by using a tapered segment, while preventing the inner surface of the tail frame from contacting the outer surface of the existing segment. Therefore, it is necessary to measure and manage the tail clearance formed between them.

Accordingly, the present applicant has previously developed a tail clearance measuring device 1 shown in FIG.
issue). As shown in the figure, an L-shaped main body 3 is provided in the tail frame 2 of the excavator so as to expand and contract in the axial direction and abut on the end face of the existing segment. A first sensor 5 for detecting a distance a to the inner surface of the segment 4 and a distance b to the inner surface of the tail frame 2
Is provided. According to this configuration, assuming that the thickness of the segment 4 is t and the distance between the first and second sensors 5 and 6 is d, the tail clearance c is calculated by the following equation.

D + b = a + t + c∴c = (dt) + (ba) Here, since d and t are constant, the first second sensor 5
By detecting a and b in 6, the tail clearance c can be calculated.

[0005]

However, in the tail clearance measuring device 1, since the L-shaped main body 3 which expands and contracts in the axial direction must be provided inside the shield jack 7, this main body 3 is narrowly excavated. A problem arises in that the space inside the aircraft is occupied and the effective working space is reduced.

In particular, in order to fit the next segment into the tip of the existing segment 4, the main body 3 needs a stroke of at least one segment as in the case of the shield jack 7. For this reason, it is inevitable that the expansion mechanism of the main body 3 becomes large, and the above-mentioned effective working space is pressed.

Providing a similar expansion and contraction mechanism in the main body 3 separately from the shield jack 7 is wasteful and increases the cost.

An object of the present invention, which has been made in consideration of the above circumstances, is to provide a tail clearance measuring device which is reduced in size and cost.

[0009]

In order to achieve the above object, the present invention provides an apparatus for measuring a tail clearance between an inner surface of a tail frame of a shield machine and an outer surface of a segment assembled in the tail frame. Ultrasonic the distance to the inner surface of the tail frame with the jack shoe of the shield jack that presses the end face of the existing segment
It provided with a stationary sensor which detects by the distance to the segment inner surface infested radially inward from the stationary sensors to existing segments inwardly while keeping a constant distance to the ultrasonic
Thus providing a movement sensor for detecting, while the shield
Attach the above fixed and
Wind the wiring connected to the motion sensor with the expansion and contraction of the jack.
A take-in or take-out reel is provided.
An arithmetic unit for calculating the tail clearance based on the detection value of the fixed / movable sensor is directly connected to the end of each of the attached wirings .

[0010]

[Function] When measuring the tail clearance, the jack shoe of the shield jack is brought into contact with the end surface of the existing segment, and the fixed sensor of the jack shoe detects the distance to the inner surface of the tail frame. The segment is moved inside the existing segment to detect the distance to the segment inner surface.

At this time, the radial distance between the moving sensor and the fixed sensor is constant, the thickness of the segment is also constant, and both are known in advance. Calculates the tail clearance based on

When the next segment is fitted to the end of the existing segment, the shield jack is contracted, and the movement sensor is pulled into the jack shoe from inside the existing segment. Thus, the segment supplied and fitted from the radial direction does not interfere with the movement sensor. Also, as in the present invention, the fixed / moving sensor
When a wave sensor is used, a so-called slip ring
Transmission is not possible, but the wiring of each sensor is wound around the lead-in reel.
Attach and take up or unwind freely, and wind around the draw-in reel
The computing unit is directly connected to the end of each
Slip while allowing expansion and contraction of shield jack
The signal of each sensor is input to the computing unit without using a ring.
I can do it.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view of a shield jack portion of a shield machine in which a tail clearance measuring device 10 according to this embodiment is incorporated, and FIG. 2 is a side sectional view thereof. In the figure, reference numeral 11 denotes a shield jack, and a plurality of shield jacks are arranged in the tail frame 12 along the circumferential direction.
The shield jack 11 causes the jack shoe 13 to extend rearward to come into contact with the end face of the existing segment 14 assembled in the tail frame 12, and to use the reaction force to advance the excavator.

A fixed sensor 15 for detecting a distance b to the inner surface of the tail frame 12 is provided on a side surface of the jack shoe 13. In addition, a movement sensor 16 is provided on the inner peripheral side surface of the jack shoe 13 so as to protrude and retract inside the existing segment 14 (inner peripheral surface) and detect a distance a to the inner surface of the segment. These fixed / movable sensors 1
An ultrasonic sensor, a light amount sensor, a laser sensor, an eddy current sensor, and the like are used for 5, 16.

FIGS. 3 and 4 show how the fixed / movable sensors 15 and 16 are attached to the jack shoe 13. FIG.
As shown in the figure, a bracket 17 is welded to a side surface of the jack shoe 13, and a fixed sensor 15 is attached to the bracket 17. The fixed sensor 15 is
In order to detect the distance b to the inner surface of the tail frame 12,
It is arranged at right angles to the inner surface of the tail frame 12.

On the other hand, a substrate 18 is welded to the inner peripheral side surface of the jack shoe 13, and the mounting plate 1 is mounted on the substrate 18.
9 is fixed by bolts 20. Therefore, by attaching and detaching the bolt 20, the movement sensor 16 on the mounting plate 19 can be replaced together with its assembly. Mounting plate 19
Is partially formed in a box shape, and an electric jack 22 is rotatably provided in the box body 21 via a bearing 23. The electric jack 22 is extended and contracted by a built-in motor and a screw feed mechanism.

A first rod 25 is pin-connected to a tip of the electric jack 22. The first rod 25 is fixed to a column 24 provided on the mounting plate 19. Prop 2
4 is supported by a box 21 of the mounting plate 19 via a bearing 26. According to this configuration, when the electric jack 22 is expanded and contracted, the support column 24 rotates through the first rod 25. At this time, the electric jack 22 also rotates. A second rod 27 is attached to the support post 24 at a position opposite to the first rod 25.

The second rod 27 is longer than the first rod 25, and rotates from the inner peripheral side of the mounting plate 19 to the inner peripheral side of the existing segment 14 as the column 24 rotates. The second rod 27 is fixed to the column 24 by a tightening bolt 28. Therefore, if the tightening bolt 28 is loosened,
The mounting position of the second rod 27 with respect to the support 24 can be adjusted as appropriate. At the tip of the second rod 27, the existing segment 1
4 is provided with a movement sensor 16 for measuring a distance a to the inner surface.

The first and second rods 25, 27 are respectively mounted at right angles to the support column 24, and
9 while rotating in parallel.
That is, even if the first and second rods 25 and 27 rotate, the radial distance d between the movement sensor 16 and the fixed sensor 15 is kept constant.

The wiring of the fixed / moving sensors 15 and 16 and the wiring of the electric jack 22 are as shown in FIGS.
They are gathered in a terminal box 29 provided on the mounting plate 19, gathered together and wound up as a cable 30 on a front draw-in reel 31. The pull-in reel 31 is attached to a frame 32 provided inside the shield jack 11, and is provided with a rotational urging force for pulling the cable 30 by a spring or the like, and extends the cable 30 as the jack shoe 13 expands and contracts. It is to pull in.

The contact of the cable 30 of the draw-in reel 31 on the signal extraction side does not use a so-called slip ring utilizing sliding contact. Fixed / movable sensor 1 for slip ring
This is because signals cannot be transmitted when an ultrasonic sensor is used for 5,16. That is, the cable 30 is wound around the pull-in reel 31 by "the length of expansion and contraction of the jack shoe 13 + a predetermined margin length", and the end thereof is directly connected to a computing unit (not shown).
It is connected to the.

The arithmetic unit comprises the fixed / movable sensors 15, 1
6, the thickness t of the segment 14 and the radial distance d between the fixed / movable sensors 15 and 16, the inner surface of the tail frame 12 and its tail frame 12.
The tail clearance c between the outer surface of the segment 14 assembled therein is calculated. That is, d + b = a + t + c is apparent from FIG. Therefore, the tail clearance c is c = (dt) + (ba)}. Here, since the radial distance d between the fixed / movable sensors 15 and 16 and the thickness t of the segment 14 are constant, the first and second sensors 15 and 16 detect a and b to reduce the tail clearance c. Can be calculated.

Such a tail clearance measuring device 10
As shown in FIG. 7, for example, three are provided at predetermined intervals in the circumferential direction of the tail frame 12. The number of attachments may be any number as long as it is three or more. However, since the bottom of the tail frame 12 may be submerged, it is better to avoid it.

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

When measuring the tail clearance c,
First, the jack shoe 13 of the shield jack 11 is brought into contact with the end face of the existing segment 14. Then, the distance b to the inner surface of the tail frame 12 is detected by the fixed sensor 15 on the side surface of the jack shoe 13. Next, the electric jack 22 on the inner peripheral side of the jack shoe 13 is extended, the second rod 27 is rotated toward the inner peripheral side of the existing segment 14, and the distance to the inner surface of the segment 14 is detected by the movement sensor 16 at the tip of the second rod 27. a is detected.

At this time, the moving sensor 16 and the fixed sensor 1
The distance d in the radial direction with respect to 5 is constant, and the thickness t of the segment 14 is also constant, and both are known in advance. Therefore, the computing unit calculates the tail clearance c by the above equation based on the values d and t and the detection values a and b of the fixed / movable sensors 15 and 16.

When the next segment is fitted to the end of the existing segment 14, the shield jack 11 is contracted and the electric jack 22 is contracted to move the movement sensor 16 from the inner peripheral side of the existing segment 14 to the jack shoe 13 side. Pull in. Thus, the segment supplied and fitted in the radial direction does not interfere with the movement sensor 16.

As described above, according to the above configuration, since the jack shoe 13 of the shield jack 11 which expands and contracts in the axial direction is also used as the main body of the tail clearance measuring device 10, the size and cost of the entire device 10 can be reduced. Can be achieved.

A modified embodiment is shown in FIGS. As shown in the drawing, this modified example is different from the previous embodiment only in the moving mechanism of the moving sensor 16, and has the same configuration as the rest. Therefore, only the movement mechanism of the movement sensor 16 will be described.

As shown in the figure, a rod 40 that rotates about one end of the jack 18 on the inner peripheral side of the jack shoe 13 of the shield jack 11 is provided. A biasing force is applied to the rod 40 by a spring 41 so as to project toward the inner peripheral side of the existing segment 14. Rod 40
Is provided with a movement sensor 16 at the other end. The wiring of the movement sensor 16 and the wiring of the fixed sensor 15
The rolls are gathered at the center of the reel 0 and wound on the pull-in reel 31 via the rollers 42.

The draw-in reel 31 is rotated by a hydraulic motor 43. Specifically, the hydraulic motor 4
The take-up force of No. 3 can be switched between two levels of strength. When the take-up force is set high, the rod 40 turns left in FIG. 5 by overcoming the urging force of the spring 41, and the movement sensor 16 is retracted. Then, the urging force of the spring 41 rotates the rod 40 to the right, and the movement sensor 16 projects.

According to this configuration, by appropriately switching the winding force of the hydraulic motor 43, the movement sensor 16 can be protruded from above the jack shoe 13 to the inner peripheral side of the existing segment 14. In addition, in FIG. 6, c = (d
Of course, the tail clearance c can be measured by -t) + (ba).

[0034]

As described above, according to the present invention, since the shield jack that expands and contracts in the axial direction is also used as the main body of the tail clearance measuring device, the size and cost of the entire device can be reduced. Also, distance by ultrasonic
The output signal of the fixed / moving sensor that performs the measurement is
Use a slip ring while allowing the jack to expand and contract
Can be input to the computing unit without the need.

[Brief description of the drawings]

FIG. 1 is a plan view of a shield jack of a shield machine in which a tail clearance measuring device according to an embodiment of the present invention is incorporated.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a partially enlarged view of FIG. 1;

FIG. 4 is an enlarged view of FIG. 2;

FIG. 5 is a plan view of a tail clearance measuring device showing a modified embodiment.

FIG. 6 is a side sectional view of FIG. 5;

FIG. 7 is a cross-sectional view of the shield machine showing a mounting position of the tail clearance measuring device.

FIG. 8 is an explanatory diagram of a tail clearance measuring device developed earlier by the present applicant.

[Explanation of symbols]

 Reference Signs List 11 shield jack 12 tail frame 13 jack shoe 14 segment 15 fixed sensor 16 movement sensor a distance from movement sensor to inner surface of segment b distance from fixed sensor to inner surface of tail frame c tail clearance d radial distance between movement sensor and fixed sensor Interval (constant) t Segment thickness

Claims (1)

(57) [Scope of request for utility model registration] An apparatus for measuring a tail clearance between an inner surface of a tail frame of a shield machine and an outer surface of a segment assembled in the tail frame.
The jack shoe of the shield jack that presses the end face of the existing segment, and the distance to the inner surface of the tail frame is supersonic.
Provided with a stationary sensor which detects the waves, ultrasound distance to segment the inner surface and retractable inward existing segment while maintaining a constant distance from the fixed sensor radially inward
The movement sensor for detecting the provided, while the sealing
Attach the above fixed
Wiring connected to the movement sensor as the jack expands and contracts
A take-up or pay-out reel is provided.
A tail clearance measuring device, wherein a computing unit for calculating the tail clearance based on a detection value of the fixed / movable sensor is directly connected to a tip of each of the attached wirings .