JPS638250B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling an excavation shear transport bucket for transporting excavated shear by the caisson construction method.

The drawing shows the state in which the slough excavated by the caisson construction method is carried to the ground surface by a bucket. Earth and sand is excavated in the caisson 1 in the work room 2, and the excavated sludge is carried upward by the bucket 11 through the shaft 3. . The upper structure of the shaft 3 has an upper lock 5 and a lower lock 6, which are alternately opened and closed to maintain the working chamber 2 under pressure and to release the bucket 11.
It has become possible to allow the passage of A winch 9 is provided on a trolley 8 moving on a rail 7 provided on the ground, and the bucket 11 is suspended from a wire rope 10 of the winch 9, and the bucket is hoisted up and lowered. The rolled-up bucket cart 11 travels side by side with the trolley 8, and is overturned by a bucket tipping device 12 to release shear into a hopper 13. Then, the shear from the hopper 13 is transported to an appropriate location by a dump truck or the like.

By the way, in this method of carrying out shear using a bucket cart, the speed of the bucket cart is controlled according to the illustrated speed pattern. That is, for example, the lowering speed is controlled to a medium speed when reaching the shaft entrance 4, a low speed when reaching the lower lock 6, then a stop, then a high speed, and a low speed and then a stop when reaching the working chamber 2. Ru. One of the means for controlling the speed of the bucket is to use a variable speed electric motor or a variable speed hydraulic motor, that is, a variable speed motor, as the drive means for the winch. Regarding speed, shaft inlet, lower lock position,
It is conceivable to install a photoelectric switch or a limit switch to detect the bucket at the entrance of the work room, detect the bucket with the photoelectric switch or limit switch, and control the variable speed motor that drives the winch based on the detection signal. However, since it is necessary to control the speed of the bucket with a complicated speed pattern, a large number of photoelectric switches and limit switches must be installed, resulting in a mechanically complex structure.

Therefore, the rotation speed of the winch is detected by a rotation speed detector, counted by a counter, etc., and the counted value is compared with the acceleration/deceleration position and stop position shown in the speed pattern in the diagram set in advance using a comparison circuit. By controlling the variable speed motor, there is no need to install many photoelectric switches or limit switches, and the speed of the bucket can be controlled with just one rotation speed detector, which is highly effective. However, if the control is performed simply using the count value of the rotary transducer, the stopping position of the bucket will shift as the caisson sinks.

The present invention improves the bucket speed control position (distance from the ground) by lowering the caisson.
This invention has been made in order to provide an automatic operation control method for a shearing bucket cart in the caisson construction method, which can accurately control the speed of the bucket cart using only one rotational speed detector even if the speed changes.

Therefore, in the present invention, the rotation speed of the winch is detected by a rotation speed detector that detects the rotation speed of the bucket winding upper and lower winches, and the number of rotations is counted by a counter such as a counter. In the bucket belt speed control system, which compares the deceleration position and the stop position using a comparison circuit and controls the variable speed motor that drives the winch based on the comparison circuit, the bucket belt passing shaft installed vertically in the caisson is A bucket detector is installed so that the bucket can be lowered from above the shaft entrance, and the bucket can be detected by the bucket detector, and the bucket can be adjusted according to the distance from the point when the bucket detector detects the bucket, that is, the sinking of the caisson. The speed of the bucket is controlled based on the winch rotation speed count value (count value) whose acceleration/deceleration position and stop position are automatically corrected. This allows precise speed control of the bucket regardless of the sinking of the caisson.

The present invention will be explained with reference to the drawings again. In order to detect the position of the bucket, the upper and lower winch 9 for winding the bucket
The number of rotations is detected by a rotation number detector, for example, a rotation transducer 14, and counted by a counter 15 or the like. A comparator circuit 16 compares the counter value counted by the counter 15 with the acceleration/deceleration position and stop position shown in the speed pattern of the figure set in advance, and inputs the output signal as a speed command signal to the variable speed motor 17 for driving the winch. Then, the speed of the variable speed motor 17, and therefore the bucket 11, is controlled according to the speed pattern shown.

In this case, if the position of the caisson 1 is always constant, the speed of the bucket can be controlled only by the control method described above, but as is well known, as the caisson 1 is excavated underground, the caisson 1 sinks and its distance from the rail 7 changes. . Therefore, in order to control the speed of the bucket tort irrespective of the sinking of the caisson, a bucket tot detector 18 is provided on the bucket tort passing shaft 3 installed upright in the caisson 1 so as to be located above near the entrance 4 thereof.
For example, a photoelectric switch can be used as the bucket detector.

Now, when the bucket belt 11 being lowered from above the shaft entrance 4 reaches the bucket belt detector 18, it is detected by the bucket belt detector 18, and the counter 15 is reset to zero by the signal from it, and the distance from there is detected. In other words, bucket speed control is performed using the counter value from there. Therefore, the speed of the bucket can be controlled according to the illustrated bucket speed pattern regardless of the sinking of the caisson.

Incidentally, instead of resetting the counter to zero, the number of rotations of the winch may be counted from the time when the bucket belt is detected by the bucket detector.

Also, the traverse speed of trolley 8 and the trolley 8
If the lifting speed of the bucket cart 11 from the bucket cart to the bucket overturning device 12 is automatically controlled according to the illustrated speed pattern, the entire process can be automatically controlled.

As described above, according to the present invention, the speed of the bucket can be accurately controlled using a single rotational speed detector according to a preset bucket speed pattern, regardless of the sinking of the caisson. It also has the advantage that position detectors such as rotational speed detectors and bucket detectors can be installed in the caissons under pressure and in locations with favorable atmospheric pressure conditions outside the shafts that are also under pressure. There is.

[Brief explanation of the drawing]

The drawing is an explanatory diagram showing a state in which shear excavated by the caisson construction method is being carried out according to the automatic operation control method of the shear carrying bucket of the present invention. 1...Caisson, 2...Working room, 3...Shaft, 4...Shaft entrance, 5...Upper lock, 6
... lower lock, 7 ... rail, 8 ... trolley, 9 ... winch, 10 ... wire rope, 1
1...bucket, 12...bucket tipping device, 1
3...hot bar, 14...rotary transducer, 15...counter, 16...comparison circuit, 1
7...Variable speed motor, 18...Photoelectric switch for bucket detection, 19...Bucket acceleration/deceleration stop position setter.

Claims (1)

[Claims] 1 The rotation speed of the winch is detected by a rotation speed detector that detects the rotation speed of the bucket winding upper and lower winch, and the number of rotations is counted by a counter such as a counter, and the counted value and the preset acceleration/deceleration position and stop position of the bucket winding are detected. In an automatic operation control method for a bucket, which uses a comparison circuit to compare the values of A bucket detector is installed, and the bucket detector is used to detect the bucket being lowered from above the shaft entrance.
The automatic operation control of the bucket can be performed based on the count value of the winch rotation speed, in which the acceleration/deceleration position and stop position of the bucket can be automatically corrected according to the distance from the time the bucket detector detects the bucket, that is, the sinking of the caisson. Automatic operation control method for sliding buckets in the caisson construction method.