JPH0540152Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for measuring the tail clearance formed between the inner surface of the tail frame of a shield machine and the outer surface of the segment. The present invention relates to a tail clearance measuring device that automatically measures tail clearance by inserting a body into the body so as to be freely retractable.

[Prior Art] Generally, a shield machine for excavating a tunnel has the following features:
A segment assembly device is provided on the inner surface of the tail frame of this shield machine to assemble segments into an annular shape to form the inner wall surface of the tunnel.
The shield jacks between the ends of the segments assembled within the tail frame and the shield frame of the shield machine are operated to push out the shield machine while digging the tunnel.

Therefore, especially when controlling the direction of a tunnel, such as when constructing a curve, it is necessary to prevent the inner surface of the tail frame from coming into contact with the outer surface of the existing segment during excavation, and to assemble new segments within the tail frame. In order to make this possible, it is necessary to maintain an appropriate tail clearance between the outer wall of the segment and the inner wall of the tail frame.

For this purpose, a tail clearance measuring device as shown in FIG. 5 has been conventionally known (for example, Japanese Patent Application Laid-Open No. 60-14582).

As shown in the figure, the tail clearance measuring device 1 is connected to the outer surface of the segment 2 and the tail frame 3.
The purpose is to measure the tail clearance S formed between the inner surfaces of the This measurement is for segment 2
This is done by taking advantage of the fact that the distance l between the outer surface 8 of and the bolt hole 6 for connecting the segments is precisely formed. That is, the tail clearance measuring device 1 includes a measuring device 4 consisting of a potentiometer.
and an inverted U-shaped mounting body 5 to which the measuring instrument 4 is attached. This attachment body 5 is provided with a lock pin 7 which is attached to and detached from the bolt hole 6 of the segment 2 by the spring force of a coil spring 9 using a handle 10 attached thereto. Also,
In the measuring device 4, a roller 14 is attached to the tail frame 3 at the tip of a terminal bar 13 extending from the terminal bar 13 in a telescopic manner.
It is attached so that it can freely come into contact with the inner surface of the Therefore, the inverted U-shaped mounting body 5 is placed over the segment end face, the handle 10 is moved, the lock pin 7 is engaged with the bolt hole 6 of the segment 2, and the coil spring 9 is biased to fix it. Next, the input terminal bar 13 of the measuring device 4 is expanded and contracted to measure the amount of displacement of the roller 14 attached to the tip thereof, and this is electrically converted to calculate and display the above-mentioned tail clearance S. It is something.

[Problem to be solved by the invention] Although the conventional tail clearance measurement method described above has the advantage of being able to continuously measure the tail clearance without requiring human labor even during excavation, Since the lock pin 7 attached to the mounting body 5 is engaged with the hole 6, the existing segment 2
Each time a new segment is installed on the end face of the tail clearance measuring device 1, it is necessary to remove the tail clearance measuring device 1 and manually replace it with the newly installed segment.

The present invention was made to solve the above-mentioned problems, and its purpose is to attach the tail clearance measuring device to the shield frame so that even when a new segment is installed in an existing segment, the device described above can be replaced. An object of the present invention is to provide a device that can continuously measure tail clearance without the need for such measurement.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an apparatus for measuring the tail clearance between the inner surface of the tail frame portion of a shield frame and the outer surface of a segment assembled on the inner surface. A reference frame is provided within the tail frame section so as to be movable along its axial direction, and whose tip end is pressed against the end of the segment during measurement. Based on the wedge body inserted between the inner surface of the frame portion and the outer surface of the segment, the pressing member that urges the wedge body to protrude from the tip of the reference frame, and the amount of relative displacement between the reference frame and the wedge body. The vehicle is configured to include a calculation device that calculates and outputs the tail clearance.

[Function] With the above configuration, by providing the tail clearance measuring device in the tail frame part, there is no need to replace the measuring device every time the segment is assembled, and everything can be operated automatically, thereby ensuring the appropriate clearance for assembling the segments. can be ensured.

[Example] A preferred example according to the present invention is shown in Figs. 1 to 4.
This will be explained based on the diagram.

As shown in the figure, the tail clearance measuring device 15 is formed between the outer surface 8 of the segment 2 assembled along the inner wall of the excavated tunnel 13 and the inner surface 11 of the tail frame 3 of the shield machine 14 excavating. The tail clearance S is automatically and continuously measured.

The tail clearance measuring device 15 is disposed within the tail frame portion 3 so as to be movable along its axial direction, and as shown in FIG. An appropriate number of shield jacks 20 are provided in the gaps between the jacks 21 of the shield jacks 20, which are provided at equal intervals on the inner peripheral surface. Thereby, an appropriate location of the tail clearance S formed over the entire circumference between the tail frame inner surface 11 and the segment outer surface 8 is measured.

The reference frame 17 of the tail clearance measuring device 15 is attached to the shield frame 16 via a jack 18 attached to a bracket 22 provided at one end thereof. A contact member 23 is formed at the other end of the reference frame 17, and is brought into contact with and separated from the existing segment side portion 12 by the action of the jack 18.

A wedge body 24 is provided on the lower surface of the reference frame 17 and on the inner surface 11 of the tail frame, and is movable together with the reference frame 17 . The wedge body 24 has a tapered upper surface, and is provided so that it can freely move in and out of the tail clearance S through an opening 25 provided at the lower part of the abutment member 23. The rear part of the wedge body 24 and a locking member 31 provided at the lower end of the reference frame 17 are connected by a rod 30, and a measurement sensor 35 is connected to the locking member 31 side via a joint 32. is interposed. A relative deviation amount α between the locking member 31 and the measurement sensor 35 is shown. The relative deviation amount α detected by the measurement sensor 35 is sent as an electrical signal, and a calculation device 40 for calculating and outputting the tail clearance S is provided on an operation panel (not shown). Further, the rod 30 connected to the rear part of the wedge body 24 is provided with the tip of the wedge body 24 brought into contact between the rear part of the wedge body 24 and a bracket 36 provided on the reference frame 17. A spring 29 is provided as a pressing member that urges the member 23 to protrude from the opening 25 . Therefore, the reference frame 17 is the same as the segment side part 1.
2, the state is as shown in FIG.

Next, the operation of this embodiment will be explained.

The operation from the state shown by A in FIG. 1, where the reference frame 17 attached to the shield frame 16 is in contact with the existing segment 2, will be explained.

In this state, work is performed to connect the new segment 2 to the existing segment 2. Therefore, the jack 18 interposed between the shield frame 16 and the reference frame 17 is operated, and the jack piston 19 is extended in the direction of arrow B in the figure. Accordingly, the reference frame 17 connected to the jack piston 19 is connected to the shield machine 1.
It moves in the direction of arrow B in the figure, which is the digging direction of step 4.
This movement causes the reference frame 17 to move away from the side of the existing segment 2 and create a new segment 2.
A space is created to connect the two. The new segment 2 is then connected to the existing segment 2. Here, the outer wall 8 of the new segment 2
The tail clearance S formed between the tail frame inner surface 11 and the tail frame inner surface 11 is measured.

The jack 18 is actuated and the jack piston 19 is pulled in the direction of arrow C in the figure, and the reference frame 17 also moves in the direction of arrow C in the figure, so that the abutment member 23 of the reference frame 17 touches the segment side part 12. It comes to contact. In this case,
As the reference frame 17 moves toward the segment side portion 12, the wedge body 24 protruding from the opening 25 of the abutment member 23 due to the bias of the spring 29 is moved toward the tail clearance S.
inserted into. Then, the wedge body 24 is urged by the spring 29 and inserted up to the tapered portion corresponding to the height of the tail clearance S. Due to this action, the amount of movement of the wedge body 24 inserted into the tail clearance S is detected as a relative displacement amount α by the stroke measurement sensor 35 attached to the other end of the rod 30 attached to this wedge body 24. be done. Therefore, the relative deviation amount α is sent as an electrical signal to the calculation device 40, and the calculation device 40 calculates and determines the tail clearance S.
By continuously displaying this value electrically,
The tail clearance S can be constantly monitored.

When the shield machine 14 is digging in the direction of the arrow B in the figure, the tail clearance measuring device 15 also moves in the same direction of the arrow B, and the abutment member 23 and the segment side portion 12 are separated, so in this case, the jack 18 The value of the tail clearance S can be constantly monitored by operating the reference frame 17 to keep the contact member 23 in constant contact with the segment side 12 and inserting the wedge body 24 into the tail clearance S. .

When the shield machine 14 has dug one ring of the segment 2, the jack 18 is operated to separate the contact member 23 of the reference frame 17 from the segment side 12 by one ring of the segment 2, and the new segment 2 is connected. will be held.

Since an appropriate number of the tail clearance measuring devices 15 are provided around the tail clearance S formed by the cylindrical segment outer surface 8 and the cylindrical tail frame inner surface 11, the calculation device 40 calculates the overall Understand the situation.

[Effects of the invention] Since the invention is as described above, it has the following excellent effects.

(1) Since the measuring device for measuring the tail clearance is attached to the shield frame, the tail clearance can be measured continuously and safely even during tunnel excavation without requiring any human intervention.

(2) Furthermore, since the measuring device is attached to the shield frame, there is no need to manually replace the measuring device every time a new segment is connected.

(3) Since tail clearance can be continuously measured while tunneling is being performed, directional control such as curve construction can be easily performed while ensuring appropriate tail clearance, making it possible to automate excavation. .

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing one embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is a cross-sectional view of the main part of Fig. 1.
FIG. 4 is an explanatory view of the tail seal clearance for installing the measuring device according to the present invention, and FIG. 5 is a sectional view showing the conventional measuring device. In the figure, 2 is the segment, 8 is the outer surface of the segment,
11 is the inner surface of the tail frame, 16 is the shield frame, 17 is the reference frame, 24 is the wedge body, 2
9 is a spring as a pressing member, 35 is a sensor, 40
is a computing device.

Claims (1)

[Scope of utility model registration request] The inner surface of the tail frame part of the shield frame,
In a device that measures the tail clearance between the outer surface of a segment assembled on the inner surface of the device,
A reference frame is provided within the tail frame section so as to be movable along its axial direction, and whose tip end is pressed against the end of the segment during measurement; Based on the wedge body inserted between the inner surface of the frame portion and the outer surface of the segment, the pressing member that urges the wedge body to protrude from the tip of the reference frame, and the amount of relative displacement between the reference frame and the wedge body. A tail clearance measuring device comprising: a calculation device that calculates and outputs a tail clearance.