JPH0452836B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an impermeable material for coating the outer periphery of the lining segment of a tunnel constructed by the shield method with an impermeable membrane such as vinyl for waterproofing. The present invention relates to a control device for a water-impermeable membrane bonding device used for sequentially bonding membranes.

[Conventional technology] In the shield construction method, during or after construction,
Water often leaks into the tunnel from the joints or cracks of the segments, and for this reason, leakage prevention work has traditionally been required at the time of or after the completion of shielding work. When groundwater overflows, problems arise such as the backfilling material injected into the tail void may be diluted by the groundwater.

Therefore, recently, an impermeable membrane (vinyl,
A method in which a polymeric material such as polyethylene is arranged and laid in a cylindrical shape, the water-impermeable membrane is bonded to an already laid water-impermeable membrane, and the outer periphery of the segment is sequentially covered with the bonded water-impermeable membrane. is considered.

If the entire circumference of the segment is covered with an impermeable membrane and a backing material is filled between the impermeable membrane and the segment, the impermeable membrane prevents groundwater from reaching the outer surface of the segment and prevents the joint of the segment. The problems mentioned above, such as water leakage from the parts, will no longer occur.

FIGS. 2 and 3 show a recently devised device for bonding and covering the outer periphery of a segment with an impermeable membrane. 1 is a shield tunneling machine,
2 is a shield frame of the shield excavator 1, 3
is a shield jack, 4 is a tail seal, 5 is a segment, 6 is an impermeable membrane laid on the outer periphery of the segment 5 and covers the segment 5, 7 is formed between the impermeable membrane 6 and the ground 8 A backfilling material injection device 10 injects a backfilling material 9 into the tail void formed by the tail void.

At the rear of the reinforcing ring frame 11 provided in the shield frame 2, that is, in the shield tail frame 2', an internal gear 13 is provided on the outer side surface, and an ultrasonic vibration type impermeable membrane bonding machine is installed at required locations on the inner side surface. Ring-shaped rotating frame 1 with attached 12
4 are arranged at a required interval in the axial direction with respect to the ring frame 11, and the ring frame 1
The shaft 16 of the DC motor 15 installed in the internal gear 1 is guided to the rotating frame 14, and the internal gear
3, a support frame 18 is provided protruding from the rear side of the ring frame 11, and a guide is provided on the support frame 18 for guiding the rotation frame 14 in contact with the inner periphery of the rotation frame 14. An appropriate number of rollers 19 are provided in the circumferential direction,
The rotating frame 14 is configured to be able to rotate along the inner periphery of the shield tail frame 2' by driving the motor 15. The welding machine 12 is connected to the shield tail frame 2' by a spring or the like.
A required pressing force is applied toward the inner wall. In the figure, 20 is a bearing that supports the shaft 16, and 21 is the bearing 2.
This is a support frame that protrudes from the rear side of the ring frame 11 to support the ring frame 11.

Further, a guide rail 24 is provided on the rear side of the ring frame 11 to protrude in the axial direction via a support frame 23, and a piece 26 having an ultrasonic vibration type impermeable membrane bonding machine 25 attached thereto is slid onto the guide rail 24. By movably engaging the piece 26 and screwing the screw shaft 27 through the piece 26, and driving the screw shaft 27 by the motor 22, the welding machine 2 is moved through the sliding movement of the piece 26.
5 is configured to be movable in the axial direction.

In such a configuration, an impermeable membrane 6' having a unit length is laid in a cylindrical shape between the ring frame 11 and the rotating frame 14 along the inner circumference of the shield tail frame 2'. At this time, the impermeable membrane 6'
It is made to wrap in the axial direction with the water-impermeable membrane 6 that has already been laid (wrapped part X), and also to wrap around the circumferential ends (wrapped part Y). In addition, when laying the impermeable membrane 6', use the bonding machine 1.
2 and 25 are clamped and separated from the surface on which the impermeable membrane is to be laid, and the membranes are laid so that the lap part do.

Therefore, if the motor 15 is driven in this state,
The rotating frame 14 rotates while being guided by the guide rollers 19 through the meshing of the pinion 17 and the internal gear 13, so that the welding machine 1
2, the lap portions X of the impermeable membranes 6' and 6 are joined together in the circumferential direction. On the other hand, when the motor 22 is driven, the piece 26 slides in the axial direction along the guide rail 24 due to the rotation of the screw shaft 27. Using this sliding movement of the piece 26, the lap portion Y is attached by the welding machine 25. Join. In this way, the circumferential connection of the wrap portions X and the axial connection of the wrap portions Y can be easily performed. Once the lap portions X and Y have been joined, the shield jack 3 is extended to move the excavator 1 forward, and the work of laying and joining the impermeable membrane 6' is repeated in the same manner as described above. Of course, during this time, the segment 5 is
assembly work will be carried out. Incidentally, when using a cylindrical impermeable membrane 6', the axial welding machine 25 is not necessary.

[Problems to be Solved by the Invention] However, when the welding machine 12 performs the lap X joining work in the circumferential direction, there is a problem that a proper joined state cannot be obtained in some places.

That is, FIG. 4 shows the splicing machine 12 in the rotating frame 14.
shows the change in current value when rotating 360° at a constant speed (1.5 m/min) (the pressing force of the horn at the tip is constant). As shown in the figure, the welding machine 12:
There was a problem in that the current value changed depending on the rotation angle position.

It is believed that the current change is caused by a change in the angle between the vibration direction of the ultrasonic transducer and the direction of gravitational acceleration.

In view of these circumstances, the present invention has been developed to adjust the current value 360°.
The joining work is performed at a constant rate.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention, by rotating a rotating frame, circumferentially circumferentially connects the overlapping portions of cylindrical impermeable membranes using an ultrasonic bonding machine. In the impermeable membrane bonding apparatus for bonding, a current detector detects the current value of the bonding machine, and the detection value of the current detector is compared with a reference value, and the rotating frame is driven based on the difference. and a controller that sends a correction command to the motor that drives the welding machine, and further includes a current detection value that detects the current value of the splicing machine, and a rotational speed of the motor that drives the rotating frame in proportion to the current detection value. The configuration includes a controller that increases and decreases the

[Operation] Therefore, in the case of the above configuration, the value detected by the current detector is compared with the reference value, and based on the difference, a correction command is sent from the controller to the motor, so that the current value remains constant. The moving speed of the joining machine is adjusted so that Further, in the case of the above configuration, the rotational speed of the motor is increased or decreased in proportion to the current value detected by the current detector. As a result, when the current decreases, the motor rotation slows down, and the current increases due to the characteristics of the ultrasonic bonding machine.Conversely, when the current increases, the motor rotation speeds up, and the current decreases due to the characteristics of the bonding machine. do. In this way, fluctuations from the proper current are automatically adjusted, resulting in an effective constant current control device.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the invention as set forth in claim 1, in which an ultrasonic oscillator 28 of a bonding machine 12 is provided with a device installed, for example, in the middle of a vibrator current line, in order to detect the current value of the bonding machine 12. A resistor 29 is inserted in the circuit so that a small potential difference can be extracted, and the extracted value is amplified by a controller 30 so that it can be compared with a reference value (set value) 31, and if there is a difference in the comparison value. The configuration is such that the rotational speed of the motor 15 is corrected when the welding machine 12 is moved, thereby controlling the circumferential movement speed of the welding machine 12.

Now, when ultrasonic waves are being oscillated from the ultrasonic oscillator 28 to the bonding machine 12, the current value of the bonding machine 12 at each angular position is
The voltage is taken out as a small potential difference by a resistor 29 in 8 and inputted to a controller 30. The controller 30 amplifies this value and compares it with the reference value 31. If there is a difference, it sends a correction command to the motor 15 to eliminate this difference, and through the meshing of the pinion 17 and the internal gear 13, the rotating frame Increase or decrease the rotation speed of 14, welding machine 1
Controls the movement speed of 2.

That is, when the detected current value is higher than the reference value, the moving speed of the joining machine 12 is controlled to be increased,
On the other hand, when the current value is low, the current value is controlled to be delayed, thereby making the current value constant in the circumferential direction.

In the above, when the current value is constant 360°, a proper bonding state can be obtained even if the moving speed changes.

Further, as an embodiment of the invention described in claim 2, a configuration is provided in which the controller 30 and a simple proportional amplifier are used, and the reference value 31 is eliminated. That is, in this case, the rotational speed of the motor 15 is increased or decreased in proportion to the detected current value. Specifically, when the current decreases, the rotation of the motor 15 slows down, and the current increases due to the characteristics of the ultrasonic bonding machine 12. On the other hand, when the current increases, the rotation of the motor 15 increases, which changes the characteristics of the bonding machine 12. , the current decreases. In this way, by forming an open-loop automatic current adjustment device by utilizing the fact that the junction current value is almost inversely proportional to the moving speed, the current value becomes constant everywhere in the circumferential direction.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the control device for the impermeable membrane joining device of the present invention, when joining the impermeable membranes that cover the outer periphery of the tunnel lining segment,
By adjusting the speed of the welding machine when it moves in the circumferential direction, the current value of the ultrasonic welding machine is controlled to be constant in the circumferential direction, so it has the excellent effect of obtaining a proper welding state in the circumferential direction. It can be played.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the control device for an impermeable membrane bonding device of the present invention, FIG. 2 is a sectional view of a shield excavator equipped with a recently devised impermeable membrane bonding device, and FIG. The figure is a view taken along the - arrow in FIG. 2, and FIG. 4 is a diagram showing changes in current value when the speed is constant. 1 is a shield excavator, 5 is a segment, 6,
6' is an impermeable membrane, 12 is a joining machine, 13 is an internal gear,
14 is a rotating frame, 15 is a motor, 28 is an ultrasonic oscillator, 29 is a resistor, 30 is a controller, and 31 is a reference value.

Claims (1)

[Scope of Claims] 1. An impermeable membrane bonding device in which overlapping portions of impermeable membranes formed in a cylindrical shape are circumferentially bonded by an ultrasonic bonding machine by rotation of a rotating frame, wherein said bonding A current detector that detects the current value of the machine, and a controller that compares the detected value of the current detector with a reference value and sends a correction command to the motor that drives the rotating frame based on the difference. A control device for an impermeable membrane bonding device characterized by: 2. In an impermeable membrane bonding device that uses an ultrasonic bonding machine to circumferentially bond overlapping portions of cylindrical impermeable membranes by rotating a rotating frame, detecting the current value of the bonding machine. 1. A control device for a water-impermeable membrane bonding device, comprising: a current detector that detects a current value; and a controller that increases or decreases the rotational speed of a motor that drives the rotating frame in proportion to a detected value of the current detector.