JPH034719B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a novel tail clearance for automatically measuring the tail clearance formed between a stainless steel outer wall and a rear inner wall of a shield tunneling machine. Regarding measuring devices.

[Prior Art] In general, a shield excavator is equipped with a segment assembly device in the rear part (tail frame) of the shield frame for assembling segments into an annular shape to cover the inner wall surface of the tunnel. After connecting a new segment and assembling one ring, you can move forward by kicking the end of this assembled segment with a shield jack. Therefore, especially when controlling the direction such as in curve construction,
In order to prevent the inner wall of the tail frame from coming into contact with the outer wall of the existing segment during propulsion, and to enable the connection and assembly of new segments within the tail frame after propulsion, there is a gap between the outer wall of the segment and the inner wall of the tail frame. It is necessary to ensure an appropriate tail clearance.
For this reason, conventionally, workers have measured the tail clearance using a scale and controlled the direction of the shield tunneling machine to ensure the tail clearance.

[Problem to be solved by the invention] However, because the tail clearance changes from moment to moment as the shield excavator moves, the worker quickly measures several points on the outer periphery of the segment many times while always paying close attention. It was necessary to do so, and it was both difficult and dangerous.

[Purpose of the Invention] The present invention has been made to solve the problems of the above-mentioned prior art, and its purpose is to provide a tail that can continuously and safely measure the tail clearance during propulsion without requiring human intervention. An object of the present invention is to provide a clearance measuring device.

[Summary of the Invention] To achieve the above object, the present invention includes a mounting member that is removably attached to the end of a segment assembled along the inner wall of an excavated tunnel, and the mounting member has a tail clearance. Measuring instruments for measuring are supported. Therefore,
By installing the tail clearance measuring device with this configuration in advance at multiple locations on the outer periphery of the existing segment, there is no need for manual measurement even while the shield excavator is digging, so the tail clearance can be measured continuously and safely. It can be performed.

[Example] An example of the present invention will be described below in detail based on the accompanying drawings.

As shown in FIGS. 1 to 3, the tail clearance measuring device 1 includes a mounting member 4 that is detachably attached to an end edge 3a of a segment 3 assembled along the inner wall of an excavated tunnel 2. , this mounting member 4 is attached to the inner wall of the shield excavator 5 on the outer wall of the segment 3, that is, the tail frame 6.
Tail clearance S formed between the inner wall of
A measuring instrument 7 is supported for measuring.

Before being assembled, the segment 3 has the shape of a ring divided into a plurality of parts in the circumferential direction, and a flange 9 having bolt holes 8 for connecting the segments to each other with bolts is provided at the outer peripheral end of each of the rings.
is formed through. The mounting member 4 is adapted to be mounted to the end edge 3a of the assembled segment 3 using its flange 9 and bolt hole 8. That is, the mounting member 4 includes a U-shaped mounting body 10 that loosely sandwiches the flange 9, and a guide hole 1 is formed at one end of the mounting body 10.
1 is formed in the guide hole 11, and a lock pin 12 having a tapered tip that engages with the bolt hole 8 is slidably inserted into the guide hole 11. A coil spring 13 that biases the lock pin 12 in the direction of engagement with the bolt hole 8 is pressed into contact with the lock pin 12, and a release lever 1 that moves the lock pin 12 in the direction of pulling it out from the bolt hole 8 against the force of the coil spring 13
4 are connected. A release lever 14 is attached to one side of the mounting body 10 via a pivot 15, and the release lever 14 and the mounting body 1
0 is formed with a pair of handles 20 facing each other.

On the other hand, the measuring device 7 includes a potentiometer that electrically measures the amount of displacement of an input terminal bar 17 extendable from the measuring device main body 16, and the measuring device main body 16 is connected to the other end of the mounting main body 10. installed on. Furthermore, a wheel 18 that rolls on the inner wall surface of the tail frame 6 is provided at the tip of the input terminal bar 17.
is attached via a bracket 19 at a position eccentric from the axis of the input terminal rod 17.

Next, we will discuss the effect. First, the tail clearance measuring device 1 is attached to a plurality of locations on the edge of the existing segment 3, for example, at the top and on the left and right sides, using the attachment members 4. This tail clearance measuring device 1 is a wheel 1
Zero point adjustment is performed at a position where 8 coincides with the position of the outer wall surface of the segment 3, and the tail clearance S is measured at a position where the wheel 18 contacts the inner wall surface of the tail frame 6. Therefore, when the tail clearance measuring device 1 is installed, the current tail clearance S will be measured at that position, and if the shield excavator 5 is advanced by one ring from this point, the input of the measuring device 7 will be Since the terminal rod 17 is displaced along the inner wall surface of the tail frame 6 via the wheels 18, changes in the tail clearance S can be continuously measured even during excavation, and the tail clearances S at a plurality of locations can be measured simultaneously.
Furthermore, even during excavation, measurements can be carried out safely and easily without requiring any manpower. Furthermore, since the mounting member 4 is attached using the bolt hole 8 with high dimensional accuracy, the measurement accuracy is also high.
When the excavation of one ring is completed, the tail clearance measuring device 1 is removed from the existing segment 3, and a new segment is connected and assembled with one ring to the existing segment 3, and then the end edge 3a of the assembled segment 3 is assembled. The procedure of attaching the tail clearance measuring device 1 to the excavator and measuring the tail clearance S while digging as described above is repeated. Thereby, the measured value can be used as data for curve construction, and the shield excavator can be caused to excavate while easily securing an appropriate tail clearance S.

Incidentally, the mounting member 4 is not limited to the above embodiment, and may have a structure that directly clamps the flange 9 in a clothespin style, for example.

[Effects of the Invention] In summary, the present invention exhibits the following excellent effects.

(1) A measuring device for measuring tail clearance is removably attached to the edge of the existing segment via a mounting member, so tail clearance can be measured continuously and safely even during excavation without the need for human intervention. be able to.

(2) Since continuous measurement is possible during excavation,
It is possible to easily control the direction of curve construction while ensuring appropriate clearance, and it is possible to automate excavation.

(3) Since it has a simple configuration consisting of a mounting member and a measuring device, it can be manufactured easily at low cost.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the tail clearance measuring device according to the present invention, and Fig. 2 is Fig. 1A.
-A arrow view, FIG. 3 is an explanatory diagram showing the measurement situation of the tail clearance. In the figure, 1 is a tail clearance measuring device, 2 is a tunnel, 3 is a segment, 3a is its edge,
4 is a mounting member, 5 is a shield tunneling machine, 6 is a tail frame, 7 is a measuring device, and S is a tail clearance.

Claims (1)

[Claims] 1. A mounting member that is removably attached to the edge of a segment assembled along the inner wall of an excavated tunnel, and a mounting member that is supported by the mounting member and is between the outer wall of the segment and the rear inner wall of the shield tunneling machine. A tail clearance measuring device comprising: a measuring device for measuring a formed tail clearance.