JPS63525A - Measurer for bottom-expanded pit excavator - Google Patents

Abstract

PURPOSE:To raise the accuracy of measurement in which a sensor for the opening amount of a cutter, a sensor for the lowering amount of a bucket, and a transmitter for detected signals of these sensors are provided, the transmitter is set on a rotary base, a signal receiver is attached to a rotary joint, and an antenna of loop type is formed. CONSTITUTION:An encoder 2 is provided for a sensor 1 for the opening amount of a cutter, and the detected signals S1 are sent out. Also, the detected signals S2 from a sensor 10 for the lowering amount of bucket below a rotary base 23 are sent out. The signals S1 and S2 are sent out from a loop antenna for transmission by a transmitter 20 attached to the base 23 and received by the antenna 31 of a receiver 30 fixed to a rotary joint. A cutter 102 contracted into a well 200 is turned by a kelly bar 112, during which period the bucket 101 is lowered to excavate a conical bottom while opening the cutter 102 in order to form an expanded bottom 201. The operability and operating efficiency of the work can thus be enhanced.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention provides a system that can automatically measure the condition of a bottom hole in order to improve the workability and excavation accuracy of an excavator that forms a bottom hole. This invention relates to a bottom hole measuring device for a bottom hole excavator.

(Prior Art) Conventionally, when constructing cast-in-place piles in the ground, the lower end of the pillar portion of the pile is enlarged to increase the supporting capacity.

As a machine for digging wells with expanded bottoms for forming such cast-in-place piles, a split bucket rotary drilling device was proposed, for example, as shown in Japanese Patent Publication No. 58-21079. has been done.

(Problem to be solved by the invention) However, conventionally, when digging a bottom hole with a bottom hole excavator, there was no way to accurately know the depth, the amount of expansion of the bottom hole, etc. Most of them relied on their intuition.

For this reason, in order to accurately form an expanded bottom shaft, a skilled worker is required, and there are limits to improving workability and efficiency.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an expandable/contractable device attached to the bucket or a rotary shaft of the bottom-expanding tunnel excavator at an appropriate position on the bucket or rotation shaft of the bottom-expanding shaft excavator. An expansion amount detector that electrically detects the amount of expansion of the cutter is installed, and a descent amount detector that detects the amount of descent of the bucket, and detection signals from the expansion amount detector and the descent amount detector are installed. , which is equipped with a transmitter that transmits electromagnetic signals to a separately provided receiver.

Further, the present invention provides that the transmitter is mounted on a rotary table attached to the rotary shaft so as to be located below the rotary joint that supports the rotary shaft, and the receiver is mounted on the rotary joint. , and the antenna of the transmitter is a loop antenna arranged concentrically and non-contact on the outer periphery of the rotary joint, and the antenna of the receiver is arranged close to the loop antenna.

(Function) The above-mentioned expansion amount detector and descent amount detector can automatically detect the expansion state of the bottom mine and its depth, and the receiver can receive the detected information and know its contents. Can be done.

Therefore, by performing excavation work while checking the detected information, the worker can easily form a highly accurate bottom expansion shaft.

In addition, since the expansion amount detector and descent amount detector must be attached to the bucket or rotating shaft, transmitting these detection signals by wire requires a rotary connector such as a slip ring, which reduces noise. To avoid this, in the present invention, as mentioned above, a transmitter equipped with a loop antenna is attached to the rotary table that rotates integrally with the rotating shaft, and a receiver is attached to the rotary joint to transmit wireless signals. The above problem is solved by transmitting detection information.

(Example) FIG. 1 shows the configuration of an embodiment of the present invention.

The expansion amount detector 1 is attached to a bucket 101 of a bottom expansion shaft excavator 100 shown in FIG.

The bucket 101 is a kelly bar suspended from a crane boom 111 of a crawler crane 110 so as to be able to rise and fall freely.
By rotating the Kelly bar 112 by a rotary drive device 114 attached to the lower end of the Kelly bar 112 and fixed to the arm 113, the bucket 101 is rotated by the Kelly bar 11.
Rotates together with 2. That is, Kelly bar 112 is
It is the rotation axis of the bucket 101.

The bucket 101 includes a plurality of cutter units 102, and these cutter units 102 are connected to an arm 103 that constitutes a pantograph mechanism.

A hydraulic cylinder 109 (shown in FIG. 3) is mounted on the bucket 101, and when the hydraulic cylinder 109 contracts, the pantograph mechanism opens and the cutter unit 02 expands.

As shown in FIG. 2, a well 200 with a desired depth is formed in the ground 300 using an earth drill or the like in advance, and the bucket 101 and the cutter unit 102 are inserted into the well 200. Lower it in the contracted state and set it to the A3 position in the figure.

From this state, the Kelly bar 112 is rotated to rotate the bucket 101, the cuckoo unit 102 is gradually expanded, and the bucket 101 is also lowered.

As a result of this operation, the bottom of the well 200 is excavated in a conical shape to form an enlarged bottom hole 201 (the bucket 101 is in the A2 position).

The expansion amount detector 1 detects the expansion amount of the cutter unit 102, and includes an encoder (rotary encoder) 2, as shown in FIG.

As shown in FIG.
A pinion gear 104, which is pivotally attached to the shaft 3 of the encoder 2, is arranged so as to mesh with the pinion gear 104.

Therefore, as the hydraulic cylinder 109 contracts, the bucket 1
01 is expanded, the round rack gear 107 is lowered, and the amount of descent of the round rack gear 107 is proportional to the amount of expansion of the bucket 101, so the output of the encoder 2 becomes a signal representing the amount of expansion of the bucket 101. .

The detection signal Sl of the expansion amount detector 1 is sent to the transmitter 20 via the code 5. The code 5 above is the bucket 10
After passing through a shackle 7 fixed at an appropriate position of 1 and being wound around a cord reel 6, it is connected to a transmitter 20,
Due to the action of the reel 6, the length of the cord 5 can be expanded or contracted as the bucket moves up and down.

Further, the origin switch 4 shown in FIG.
When the cutter unit 102 is contracted to the preset maximum contraction position, it is turned on by mechanical force to reset the detected value.

For example, as shown in FIG.
4 is installed on a rotating table 23 that rotates together with the rotating table 4. Although the rotary table 23 rotates together with the Kelly bar 114, it is supported using a fixed bearing or the like so that it remains in a fixed position even when the Kelly bar 114 descends.

A descent amount detector 10 is attached to the lower surface of the rotary table 23. This descent amount detector 10 has a bucket 10 at its tip.
The reel 12 is configured with a rotary encoder that detects the amount of rotation of the reel 12 that winds up the wire 11 fixed to the wire 101. When the wire 11 extends as the bucket 101 descends, the reel 12 rotates and corresponds to the amount of descent of the bucket. A detection signal S2 is output.

The origin switch 21 shown in FIG. 1 is for resetting the detected value of the descent amount detector 10, and is turned on by mechanical force when the bucket 101 rises to a preset uppermost position. Then, the detected value is reset.

The transmitter 20 receives a detection signal S1 of the amount of expansion of the cutter unit 102 detected by the expansion @ detector 1, and a detection signal S2 of the amount of descent of the bucket 101 detected by the amount of descent detector 10. is converted into an electromagnetic wave signal and transmitted from the transmitting antenna 22.

This transmitting antenna 22 is connected to the rotary joint 106
This is a loop antenna placed concentrically and non-contact around the outer periphery of the antenna.

Then, on the side surface of the rotary joint 106, a
A receiving antenna 31 using a high antenna is attached, and this receiving antenna 31 is arranged as close to the transmitting antenna 22 as possible. This receiving antenna 22 is connected to a receiving stage 30 which is also fixed to the rotary joint 106.

In this way, the transmitting antenna 22 using a loop antenna
By combining this and the receiving antenna 31 placed close to this, even if the Kelly bar 112 rotates, the distance between the transmitting antenna 22 and the receiving antenna 31 does not change at all times, so the receiving (No. 8 level) does not fluctuate. Able to convey one word with good sensitivity.

Further, since the transmitting antenna 22 is a loop antenna, the directivity and propagation distance can be limited, and the attenuation rate is also high, so that there is almost no influence on external equipment as noise radio waves.

Reception received by the receiving antenna 31 (No. 8 is the receiver 3
After detection, amplification, etc. are performed at 0, a detection signal S1 representing the amount of expansion of the cutter unit and a detection signal S2 representing the amount of descent of the bucket are extracted and input to the computer unit 40.

The computer unit 40 includes a color CRT 70, D
It is installed in the cockpit of the crawler crane 110 together with the C/ACC/type-ku 50 and the switch box 80.

DC/ACC/Type-ta 50 is crawler crane 110
The computer unit 40 and color C
RT 70 and the receiver 30 are supplied with power.

The computer unit 40 performs processing to display on the color CRT 70 the input detection signal Sl of the amount of expansion of the cutter unit and the detection signal S2 of the amount of descent of the bucket.

A screen as shown in FIG. 4 is displayed on the color CRT TO. This display indicates that bucket l-101 is connected to well 200.
After descending to the bottom, turn on the reference set box 81 of the switch box 80! It is displayed by creating.

The display contents include a pictorial display of the well 200 and the bucket 101, a numerical display of the descent amount of the bucket 101, that is, the depth position (indicated by "Fukasa" in the figure), and a numerical display of the diameter of the bottom expansion hole. (Displayed as "Cafty Gay" in the figure), numerical display of bucket diameter (displayed as "Bucket" in the figure), and scale display of "Fukasa" (displayed on the left side of the figure). There is).

Then, when the excavation work of the bottom expansion shaft 201 is started, the display of "Fukasa", "Bucket", and "Kaftikai" is changed based on the detection signals S, S, and,
The position and size of the pictorial representation 101a of the bucket change. Further, the pictorial display 201a of the bottom expansion shaft 201 also expands as the bucket expands.

Therefore, while looking at the above screen, the worker can excavate until the circumference of the pictorial display 201a of the expanded shaft matches the set line 201b, thereby creating the expanded shaft as designed.
01 can be formed.

After the work is completed, by turning on the end button 82 of the switch box 80, the screen display of the color CRT 70 is cleared.

Note that it is also possible to detect the position of the bucket 101 within the well 200 (the amount of eccentricity with respect to the center of the well) from the amount of expansion of the cutter unit 102.

(Effects of the Invention) As described in detail above, the present invention provides a detector for electrically detecting the amount of descent of the bucket of the bottom-expanding tunnel excavator and the expansion l of the cutter, and By installing a transmitter that transmits the detection signal as an electromagnetic wave signal, it is possible to automatically detect the expansion state of the bottom mine and its depth, and the receiver can receive the detection signal and know its contents. Can be done.

Therefore, by performing excavation work while checking the detected information, the worker can easily form a highly accurate bottom expansion shaft.

In addition, since the expansion amount detector and descent amount detector must be attached to the bucket or rotating shaft, a rotary connector such as a slip ring is required to transmit these detection signals by wire. However, in the present invention, a transmitter equipped with a loop antenna is attached to the rotary table that rotates integrally with the rotating shaft, and a receiver is attached to the rotary joint, and the receiving antenna is By arranging it close to the loop antenna, the detection signal can be transmitted using a wireless signal, and the above problem can be solved.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is a side view showing an example of an extended bottom pit excavator to which the embodiment shown in Fig. 1 is applied, and Fig. 3 is a diagram showing an example of the extended bottom pit excavator to which the embodiment shown in Fig. 1 is applied. An enlarged view of the vicinity of the bucket. FIG. 4 is a diagram showing an example of the contents of the screen displayed on the color CRT shown in FIG. 1. 1... Expansion amount detector 2... Encoder 4.
... Origin switch 5 ... Code 10 ... Descent amount detector 20 ... Transmitter 21 ... Origin switch 22 ... Transmission antenna 23 ... Rotating table
30...Receiver 31...Receiving antenna
40... Computer unit 50... DC/A
C converk 70...Color CRT80...Switch box 100...Bottom hole excavator 101...
Bucket 102...Cutter unit 103
... Arm 106 ... Rotary joint 109 ... Hydraulic cylinder 110 ... Crawler crane 112 ... Kelly bar (rotating shaft) 114 ... Rotation drive device

Claims (1)

[Claims] 1. A bucket supported by the tip of a rotating shaft and equipped with a cutter that can be expanded and contracted is lowered into a well drilled in the ground, and the bucket is rotated while expanding the cutter. In a device for measuring the state of the bottom hole, which is installed in a bottom hole excavator that excavates around the bottom of the well to form a bottom hole by causing the bottom hole to form a bottom hole, the device is provided at an appropriate position of the bucket or the rotating shaft. hand,
an expansion amount detector that electrically detects the amount of expansion of the cutter; a descent amount detector that is attached to a rotating part including the rotation shaft and that electrically detects the amount of descent of the bucket; and the rotation shaft. a rotary table that is attached to a rotating shaft and rotates integrally with the rotating shaft so as to be located below a rotary joint that supports the rotary joint; a detection signal transmitter that transmits a detection signal by an electromagnetic wave signal; and a receiver that sends a received signal to a signal processing device, and the antenna of the detection signal transmitter is a loop antenna arranged concentrically and in a non-contact manner around the outer periphery of the rotary joint, and the antenna of the receiver is , a bottom mine measuring device for a bottom pit excavator, characterized in that it is disposed close to the loop antenna.