JPH0626626Y2 - Tail clearance measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a tail clearance measuring device for measuring a tail clearance formed between an inner surface of a tail frame and an outer surface of a segment of a shield machine. Is.

[Prior Art] Generally, a shield machine for excavating a tunnel is equipped with a segment assembly device for annularly assembling segments on an inner surface of a tail frame of the shield machine to form an inner wall surface of the tunnel. The shield jack between the end of the assembled segment and the shield frame of the shield machine is operated to push the shield machine and excavate the tunnel.

Therefore, especially when carrying out direction control such as when constructing a curve in a tunnel, the inner surface of the tail frame should not come into contact with the outer surface of the existing segment during excavation, and the work of connecting and assembling new segments in the tail frame should be performed. In order to be able to do this, it is necessary to keep the tail clearance formed between the outer wall of the segment and the inner wall of the tail frame adequate.

Therefore, conventionally, a tail clearance measuring device as shown in, for example, FIG. 6 is known (for example, JP-A-60-145).
No. 82).

As illustrated, the tail clearance measuring device 1 measures the tail clearance c formed between the outer surface of the segment 2 and the inner surface of the tail frame 3.
This measurement is performed by utilizing the fact that the distance 1 between the outer surface 4 of the segment 2 and the bolt hole 5 for connecting the segments to each other is accurately formed. That is, the tail clearance measuring device 1 is a measuring device 6 including a potentiometer.
And an inverted U-shaped mounting body 7 to which the measuring instrument 6 is mounted. The mounting body 7 is provided with a lock pin 10 which can be attached to and detached from the bolt hole 5 of the segment 2 by utilizing the urging force of the coil spring 9 by operating the handle 8 attached to the mounting body 7. Further, in the measuring instrument 6, a roller 12 is attached to the tip of an input terminal rod 11 extending from the measuring instrument 6 so as to be able to come in contact with the inner surface of the tail frame 3. Therefore, the inverted U-shaped mounting body 7 is attached to the segment 2
The handle 8 is moved across the end face to engage the lock pin 10 with the bolt hole 5 of the segment 2 and urge the coil spring 9 to fix it. Then, the input terminal rod 11 of the measuring instrument 6 is expanded and contracted to measure the displacement amount of the roller 12 attached to the tip thereof, which is electrically converted to calculate and display the tail clearance c. It is a thing.

[Problems to be Solved by the Invention] The above-described conventional tail clearance measuring device 1 has an advantage that the tail clearance c can be continuously measured without manpower even during excavation. Since the lock pin 10 attached to the attachment body 7 is engaged with the bolt hole 5 of the segment 2,
Each time a new segment was incorporated into the end surface of the existing segment 2, the tail clearance measuring device 1 had to be manually removed and replaced with a new segment by the troublesome work.

Further, as is clear from the shape of the mounting body 7, as shown in FIG. 6, other than the segment 2 having a flange portion protruding toward the tunnel center side at the end portion (for example, a concrete segment), The tail clearance measuring device 1 cannot be attached, and the tail clearance c can be measured only in a limited segment.

In view of such circumstances, the present invention aims to provide a tail clearance measuring device that does not require replacement even when a new segment is incorporated into an existing segment and that does not select the segment type.

[Means for Solving the Problems] The present invention relates to a tail frame inner surface of a shield frame,
In a tail clearance measuring device for measuring a tail clearance between an outer surface of a segment assembled on the inner surface of the tail frame, the tail clearance measuring device is provided on the inner surface side of the tail frame so as to be movable in a tunnel axis direction, and contacts the front end surface of the segment. A main body frame having a segment front end face abutting portion capable of contacting, a pressing plate attached to the main body frame so as to be movable in the tunnel radial direction and capable of abutting the inner surface of the segment front end portion, and a pressing plate fixed to the pressing plate. A measurement sensor that detects a relative distance to the inner surface of the tail frame when the plate is pressed against the inner surface of the front end of the segment, and a calculation device that calculates and outputs the tail clearance based on the relative distance detected by the measurement sensor. It is characterized by being prepared.

[Operation] Therefore, when the main body frame is moved in the tunnel axial direction to the position where the segment front end face abutment portion abuts the segment front end face, and the pressing plate is moved in the tunnel radial direction to abut the segment front end inner face. The relative distance to the inner surface of the tail frame is detected by the measurement sensor, the tail clearance is calculated by the arithmetic unit based on the relative distance, and the tunnel excavator is excavated by the shield machine so that the tail clearance becomes a desired value. Then, when a new segment is assembled, it is only necessary to move the body frame forward by a required amount in the tunnel axis direction, and the tail clearance can be measured in any segment.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 (a) (b) to 5 show an embodiment of the present invention, in which the same reference numerals as those in FIG. 6 represent the same parts.

Guide blocks 15 are arranged on the inner peripheral surface of the ring gutter 14 of the shield frame 13 at a required pitch in the circumferential direction of the tunnel 16, and a pipe-shaped guide member 17 is tunneled to the guide blocks 15.
16 The rod 19 of the segment front end positioning jack 18, which is slidably inserted in the axial direction and is arranged rearward concentrically with the guide member 17 at a substantially central portion of the guide member 17, is fitted with a fitting member 20. Through the through hole 22 fixed to the rear end of the guide member 17 and communicating with the internal space 21 of the guide member 17.
The body frame 23 having the holes is connected by bolts 24.

The main body frame 23 has a segment front end face abutting portion 25, which can be brought into contact with the front end face of the segment 2 by the extension operation of the front end alignment jack 18 of the segment, which extends rearward by a required amount at the end of the tail frame 3 on the opposite side. A guide seat 26 is formed at a required position on the axial center side of the tunnel 16 with respect to the segment front end face abutting portion 25 and extends further rearward from the segment front end face abutting portion 25 by a required amount.

The segment front end face abutting portion 25 has a U shape when viewed in plan as shown in FIG.
Nylon bushes 27, 27 for preventing damage to the front end surface of the segment 2 are adhered to the rear end surfaces of the a and 25a. A slide bar 29 whose part penetrates the nylon bush 27 from the rear end surface of one of the overhanging parts 25a and projects a required amount.
Is slidably inserted in the axial direction of the tunnel 16 and the rear end of the slide bar 29 has the one overhanging portion 25.
When the segment front end face abutting portion 25 is in contact with the segment 2 front end face through the rod 30 extending forward integrally with the slide bar 29 when it is completely pushed into the a, the detection signal is detected. Output contact type (potentiometer, etc.)
Alternatively, a non-contact type (proximity sensor or the like) segment front end position detection sensor 31 is disposed on the front surface of the segment front end face contact portion 25.

A segment inner surface alignment jack 32 extending in the radial direction of the tunnel 16 and penetrating the guide seat 26 is attached to the rear surface of the body frame 23, and a guide extending parallel to the segment inner surface alignment jack 32 is provided. Rod 33,3
3 is slidably inserted into the guide seat 26, the rod 34 of the jack 32 for aligning the inner surface of the segment and the tips of the guide rods 33, 33 have a nylon bush 35 for preventing damage to the inner surface of the segment 2 on the surface. Pressing plate 3 with 35 attached
6, the pressing plate 36 is provided with a measuring sensor 37 for measuring the tail clearance c extending parallel to the segment inner surface positioning jack 32 as shown in FIGS. The measurement sensor 37 is shown as a contact type, that is,
A roller 37c capable of contacting with the inner surface of the tail frame 3 is attached to the tip of a rod 37b which extends and contracts from the main body portion 37a of the measurement sensor 37.

On the other hand, as shown in FIGS. 1 and 3, a contact type or a non-contact type for detecting that the guide rod 33 has reached the stroke end on the retracted side at the axial extension position of the guide rod 33 on the rear surface of the body frame 23. With the retracted position detection sensor 38, the operation element 39 protruding rearward is fixed to the lower end portion of the guide rod 33, and the guide rod 33 is at the stroke end on the pushing side at a required position on the rear surface of the guide seat 26. That is, the pressing plate 36 is a nylon bush.
A segment inner surface position detection sensor 40 for detecting contact with the inner surface of the segment 2 via 35, 35 is provided.

Furthermore, the hydraulic hoses 41 and 42 of the segment inner surface alignment jack 32, the cable 43 of the measurement sensor 37, the cable 44 of the segment front end position detection sensor 31, the cable 45 of the retracted position detection sensor 38, and the segment inner surface position detection sensor 40. Through the through holes of the body frame 23.
While being guided from 22 to the internal space 21 of the guide member 17, the shield machine 53 is made to pass through hydraulic hose holes 47, 48 and cable holes 49, 50, 51, 52 formed in the fitting member 20 as shown in FIG.
, The cable 43 of the measurement sensor 37, the measurement sensor installed on the body side of the shield machine 53
It is connected to a computing device 54 for computing and outputting the tail clearance c based on the relative distance α detected at 37.

Next, the operation of the above embodiment will be described.

The inner surface of the segment inner surface alignment jack 32 is contracted to
As shown in FIG. 2B, when the segment front end alignment jack 18 is extended with the guide rod 33 positioned at the stroke end on the pull-in side, the body frame 23 retracts and the segment front end face contact portion 25 Is a nylon bush
When the front end face of the segment 2 is contacted via the 27 and 27, the slide bar 29 resists the urging force of the spring 28 and the protruding portion 25.
It will be pushed completely into the slide bar 29
The segment front end position detection sensor 31 is operated via the rod 30 to stop the extension operation of the segment front end position adjusting jack 18 and hold the main body frame 23 at that position.

When the segment front end face contact portion 25 of the main body frame 23 contacts the segment 2 front end face, the segment inner surface alignment jack 32 subsequently expands, and the pressing plate 36 interposes the nylon bushes 35, 35 on the segment 2 inner surface. At a position where the segment inner surface position detecting sensor 40 is actuated by the actuating element 39 at the lower end of the guide rod 33, the extension operation of the segment inner surface positioning jack 32 is stopped and the pressing plate is pressed.
36 is held at that position, and the rod 37b of the measurement sensor 37 attached to the pressing plate 36 is provided at the tip roller 37.
c contacts the inner surface of the tail frame 3 (see FIG. 1B).

In this state, the measurement sensor 37
The relative distance α between the front end of the main body portion 37a and the inner surface of the tail frame 3 is detected, and the relative distance α is sent to the arithmetic unit 54 as an electrical detection signal. The tail clearance c is obtained from the relationship with the thickness t of a certain segment 2, the value of the tail clearance c is output to a display device or the like not shown, and is used as data for controlling the direction of the shield machine 53. .

When the shield machine 53 excavates the tunnel 16 and moves forward, the main body frame 23 also moves forward and the segment front end face abutting portion 25 separates from the segment 2 front end face, but at this time, The slide bar 29 is projected rearward by the urging force of the spring 28, and the front end face contact portion of the segment is
It is determined by the segment front end position detection sensor 31 that 25 is not in contact with the segment 2 front end face, and the segment front end alignment jack 18 extends. Therefore, the segment front end contact portion 25 is always in the segment 2 front end face. The tail clearance c can be constantly measured even while the shield machine 53 is moving forward. or,
In this case, the pressing plate 36 moves a small amount in the axial direction of the tunnel 16 while being in contact with the inner surface of the segment 2. However, since the pressing plate 36 has the nylon bushes 35, 35 attached, There is little resistance and there is no fear of damaging the inner surface of the segment 2.

When the shield machine 53 excavates one ring of the segment 2, the segment inner surface alignment jack 32 is contracted again to move the guide rods 33, 33 to the stroke end on the retracting side, and the segment front end alignment jack. After contracting 18 and advancing the main body frame 23 to the position shown by the chain double-dashed line in FIG. 1 (b), a new segment 2'is installed into the existing segment 2 by an erector not shown. The operation of is repeated.

In this way, it is possible to save the trouble of changing the device each time a new segment 2'is installed into the existing segment 2 as in the conventional case, the tail clearance c can be continuously and safely and accurately measured, and it is made of steel. However, even if it is made of concrete, it can be applied to any segment.

It should be noted that the tail clearance measuring device of the present invention is not limited to the above-mentioned embodiment, and the measuring sensor 37 may be a non-contact type, so that it does not depart from the gist of the present invention. It goes without saying that various changes can be made in.

[Advantage of Device] As described above, according to the tail clearance measuring device of the present invention, it is not necessary to replace the device each time a new segment is installed in an existing segment, and the tail clearance can be accurately measured continuously and safely. It has the excellent effect that it can be applied to any type of segment.

[Brief description of drawings]

1 (a) and (b) are side sectional views of one embodiment of the present invention, FIG. 2 is a view taken along the line II-II of FIG. 1 (a), and FIG. 3 is of FIG. 1 (a). III-I
II arrow view, FIG. 4 is a IV-IV sectional view of FIG. 1 (a), FIG. 5 is a VV sectional view of FIG. 1 (b), and FIG. 6 is a side sectional view of a conventional example. is there. 2, 2'is a segment, 3 is a tail frame, 13 is a shield frame, 16 is a tunnel, 23 is a body frame, 25 is a segment front end face contact portion, 36 is a pressing plate, 37 is a measurement sensor, 54 is a computing device, c is the tail clearance, α is the relative distance, and t is the segment thickness.

Claims (1)

[Scope of utility model registration request] 1. A tail clearance measuring device for measuring a tail clearance between an inner surface of a tail frame of a shield frame and an outer surface of a segment assembled on the inner surface of the tail frame, wherein a tunnel axis direction is provided on an inner surface side of the tail frame. And a main body frame having a segment front end face abutting portion capable of abutting against the segment front end face, and attached to the main body frame so as to be movable in a tunnel radial direction and capable of abutting on the segment front end inner face. A pressing plate, a measurement sensor which is fixed to the pressing plate and detects a relative distance to the inner surface of the tail frame when the pressing plate is pressed against the inner surface of the front end of the segment, and the relative distance detected by the measuring sensor. It is characterized by comprising a calculation device that calculates and outputs the tail clearance based on Tail clearance measuring device for the.