JPH09165989A - Drilling control device for bottomed earth drill - Google Patents

Abstract

(57) [Abstract] [Problem] The bottom of the vertical hole can be drilled accurately to the target bottom diameter.
(EN) An excavation control device for an expanded bottom earth drill capable of preventing excessive excavation due to operator's negligence. SOLUTION: The actual bottom expansion diameter detecting means for detecting the actual bottom expansion diameter formed by the expansion blades of the bottom expanding bucket, the comparing means for comparing the actual bottom expansion diameter with the target bottom expansion diameter, and the actual bottom expansion diameter is the target. There is provided a diameter expansion stopping means for stopping the operation of the diameter expansion hydraulic cylinder in the diameter expansion direction when the diameter reaches the diameter expansion bottom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavation control device for accurately setting a bottom expansion diameter to a target bottom expansion diameter in a bottom expansion earth drill.

[0002]

2. Description of the Related Art A bottom-expanding earth drill is a bottom-expanding bucket which has expansion wings that are opened and closed by a hydraulic cylinder for diameter expansion and is attached to the lower end of the kerry bar. Simultaneously with the rotation, the diameter expansion hydraulic cylinder is gradually extended to open the expansion blade to excavate the bottom expansion part, take the excavated earth and sand into the bottom expansion bucket, and when the bottom expansion bucket is filled with the excavation earth and sand, the excavation bucket The bottom cover of the excavation bucket on the ground to remove the soil, and then unload it again to the bottom of the excavation bucket and the vertical hole to perform excavation in the same manner as above to increase the diameter of the bottom expansion part and support it. It is to construct cast-in-place piles with high strength.

In such an expanded bottom earth drill,
Since it is an underground operation where the bottom expanding bucket cannot be seen, as a means to detect the actual bottom expanding diameter determined by the opening degree of the expanding blade, an equalizer link that operates in response to opening and closing of the expanding blade and the angle that detects that angle. A detector (potentiometer) is installed in the bottom expansion bucket, the signal of the angle detector is guided to the ground via a cable, and the actual bottom expansion diameter is calculated and displayed by the computer installed in the operator's cab of the pile driver on the ground. As a result, the operator is notified, and when the actual bottom expansion diameter reaches the target bottom expansion value, an alarm is issued to notify the operator that the target bottom expansion diameter has been reached.

[0004]

As described above, in the conventional apparatus, when the actual bottom diameter has reached the target bottom diameter, a warning is given. Since it is expanded and contracted by artificially operating the control valve of, the operator may erroneously excavate larger than the target bottom expanding diameter.Excavation larger than the target bottom expanding diameter may result in extra excavation. There is a problem in that the energy loss required and the resource loss that the drilled hole is excessively filled with concrete occur.

The present invention has been made in view of the above-mentioned problems, and an expanded bottom earth drill capable of accurately excavating the expanded bottom of a vertical hole to a target expanded diameter and preventing excessive digging due to operator's error. An object is to provide an excavation control device.

[0006]

In order to achieve this object, the invention of claim 1 is an actual bottom expanding diameter for detecting an actual bottom expanding diameter formed by expanding blades of a bottom expanding bucket opened and closed by a diameter expanding hydraulic cylinder. Detecting means, comparing means for comparing the actual expanded bottom diameter with the size of the target expanded diameter, and stopping the operation of the expanding hydraulic cylinder in the direction of expanding the diameter when the actual expanded diameter reaches the target expanded diameter. It is characterized in that it is provided with a diameter expansion stopping means.

According to a second aspect of the invention, the actual bottom expansion diameter detecting means is a flow rate detector installed on the ground for detecting the flow rate of the hydraulic oil to the diameter expansion hydraulic cylinder for opening and closing the expansion blades of the bottom expansion bucket, And an arithmetic means for calculating an actual bottom diameter of the expanding blade from an output signal of the flow rate detector.

According to a third aspect of the present invention, the flow rate detector is installed on the rotating side of a rotary joint that supplies hydraulic oil to the hydraulic cylinder for expanding the diameter of the bottom expanding bucket.

[0009]

According to the invention of claim 1, the actual bottom expanding diameter detected by the actual bottom expanding diameter detecting means and the preset target bottom expanding diameter are compared by the comparing means, and the actual bottom expanding diameter reaches the target bottom expanding diameter. Then, the bottom expanding operation is automatically stopped by the stopping means by the output of the comparing means.

According to the second aspect of the present invention, the flow rate of the hydraulic oil to the hydraulic cylinder for expanding the diameter is detected by the flow rate detector, and the calculating means calculates the actual expanded bottom diameter from the flow rate detector.

According to the third aspect of the invention, since the flow rate detector of the second aspect is provided on the rotary side of the rotary joint, the influence of oil leakage of the rotary joint does not affect the detection value of the flow rate detector. Measurement can be performed, and a more accurate expanded bottom is formed.

[0012]

1 is a hydraulic electric circuit diagram showing an embodiment of the present invention, and FIG. 2 is a side view of an earth drill to which the present invention is applied. In FIG. 2, the earth drill body 1 is a lower traveling body 1.
An upper revolving structure 1c is installed on a via a revolving device 1b, a boom 2 is erected on the upper revolving structure 1c, and a front frame 3 is erected on the upper revolving structure 1c or the boom 2. The front frame 3 has an upper frame 3a on the upper part, and a kelly drive device 4 is mounted on the upper frame 3a. The kelly drive device 4 has a drive hole in which a kerry bar 5 is vertically movably and non-rotatably inserted, and a hydraulic motor rotates the kerry bar 5 to rotate the bottom expanding bucket 9 via the kerry bar 5. The kelly bar 5 is connected and supported via a swivel joint 8 to a wire rope 7 which is wound and unwound by a winch 6 mounted on the upper swing body 1c and is hung from the top of the boom 2.

As shown in the side view of FIG. 3 and the plan view of FIG. 4, the bottomed bucket 9 has a plurality of (two in the present embodiment) enlarged wings 9b which are opened and closed about a fulcrum 9a. , Each expanding wing 9b is provided with a hydraulic cylinder 10 for diameter expansion.
It is opened and closed by.

[0014] As shown in FIG.
Is provided with a rotary joint 11 attached to the upper frame 3a. The rotary joint 11
Is for supplying hydraulic oil to the hydraulic cylinder 10 of the bottomed bucket 9 and comprises a non-rotating outer cylinder fixed to the upper frame 3a and an inner cylinder rotatably fitted therein. A groove-shaped or hole-shaped oil passage is formed in these.
The kelly bar 5 is inserted into the inner cylinder, and in a state where the hydraulic hose 12 is connected to at least the hydraulic cylinder 10 so that the hydraulic hose 12 for supplying the hydraulic oil to the hydraulic cylinder 10 does not wind around the kelly bar 5, the inner cylinder is Rotate with Keriva 5

A hose reel base 14 is installed on the rotary side of the rotary joint 11, and a hose reel for winding a hydraulic hose 12 for supplying hydraulic oil to the hydraulic cylinder 10 on the hose reel base 14 with a constant torque. 13 is mounted.

In the hydraulic electric circuit diagram of FIG. 1, 14, 1
5 is a hydraulic pump mounted on the upper revolving structure 1c, 16 is a control valve of the hydraulic cylinder 10, 17 is a control valve for the torque motor 13a of the hose reel 13, 1
Reference numeral 8 is a flow rate detector for hydraulic oil installed on the hose reel stand 14, and the flow rate detector 18 is connected to the hose reel 13 in the return hydraulic pipe between the rotary joint 11 and the hydraulic cylinder 10. One of the hydraulic lines between
0, that is, it is inserted in the hydraulic pipe connected to the bottom chamber of the hydraulic cylinder 10. The flow rate detector 18 may be provided in a pipe 21 connected to the rod chamber side of the hydraulic cylinder 10. Reference numeral 11a denotes a drain pipe for returning oil leaking from the seal portion of the rotary joint 11 to the oil tank 34 on the main body.

As shown in the configuration diagrams of FIGS. 1 and 5, the hydraulic pipes 20 and 21 are provided with pressure sensors 22 and 23 for detecting the flow direction of the hydraulic oil in the flow rate detector 18, respectively. To be

As shown in FIGS. 3 and 5, on the hose reel stand 14, the pulse from the flow rate detector 18 is converted into a voltage signal, and the outputs of the pressure sensors 22 and 23 are compared and calculated. A converter 24 for converting the result into a voltage signal is provided, and a transmitter 25 for transmitting these signals by a FM signal which is a radio signal is installed to a receiver 26 installed on the upper swing body 1c. In this way, the flow rate signal is transmitted by the wireless signal because the rotary joint 11 is provided with a slip ring or the like that electrically connects the rotating portion and the non-rotating portion to the rotary joint 11. Becomes large, and the height of the bottom expanding bucket 9 is limited accordingly, and it becomes difficult to secure a working space for the bottom expanding bucket 9. However, if the signal is transmitted wirelessly, it is not necessary to make the rotary joint 11 large in size. This is because.

Further, as shown in FIG. 3, the upper swing body 1c
A computer (arithmetic device) 30 is installed in the upper cab 1d, and the computer 30 is provided with a printer 31 and a display (display device) 32 (see FIG. 5). A signal from the flow rate detector 18 is input to the computer 30 via a transmitter 25 and a receiver 26, and a belt 35 is attached to a top sheave 27 at the top of the boom 2 as shown in FIG. The depth detector 28 is attached so as to interlock with the output, and the output is integrated and displayed by the depth meter 29, and the result (depth) is input to the computer 30.

In the hydraulic electric circuit diagram of FIG. 1, 43 is an operation switch of the control valve 16, and the operation switch 43 is a solenoid of the control valve 16 when the movable contact is operated so as to be connected to the X side. 16a is excited to switch the control valve 16 to the left position in FIG. 1, the diameter-expanding hydraulic cylinder 10 is extended, the expansion blade 9b is operated in the opening direction, and the solenoid 16 is operated when operated to the Y side.
b is excited, the control valve 16 is switched to the right position in FIG. 1, the diameter expansion hydraulic cylinder 10 contracts, and the expansion blade 9
b operates in the closing direction.

Further, in the circuit of FIG. 1, as a function realized by the computer 30, a calculating means 36 for calculating the current actual bottom diameter from the flow rate signal sent through the transmitter 25 and the receiver 26. And a target bottom expansion diameter setting means 37 realized by a keyboard and a memory, and a means 38 for comparing the set target bottom expansion diameter with the actual bottom expansion diameter calculated by the calculating means 36. The output side of the computer 30 is connected to a relay circuit 39 which constitutes a means for stopping the expansion of the expansion blade 9b. Inside the relay circuit 39, a circuit 44 for expanding the diameter of the operation switch 43 of the control valve 16 is provided.
A relay having a contact 40 for disconnecting is provided. And
When the diameter expansion stop signal is given from the computer 30 to the relay circuit 39, even if the relay contact 40 is opened and the operation switch 43 is operated to the X side, the diameter of the expansion blade 9b is increased by disconnecting the circuit 44. The enlarging operation is automatically stopped. The relay circuit 39 is attached with a circuit for closing the relay contact 41 and turning on the alarm lamp 43 when the target bottom diameter is reached.

FIG. 6 is a flow chart for explaining the operation and operation of this embodiment, and steps S1 to S4 are the processing when the bottom expanding bucket 9 is on the ground. First, step S1
The axis and bottom expansion selection is a step of selecting whether the excavation is axial digging (drilling of a vertical hole before digging the bottom expanding part) or digging the bottom expanding part and performing a key input to the computer 30. In step S2 of selecting the initial function and step S3 of adjusting the bucket bottom expansion diameter, the bottom expansion bucket 9 is scaled on the ground and the actual bottom diameter R (Fig. 4) is output from the output of the flow rate detector 18.
(Refer to FIG. 7), and the actual expanded bottom diameter and other information are displayed on the display 32 as shown in FIG.

Step S4 of inputting initial data is a step of keying in date, bucket format, pile number, depth of vertical hole and the like.

Here, the hydraulic cylinder 1 of the expanded bottom bucket 9
The operation of enlarging the bottom expanding bucket 9 by supplying the hydraulic oil to 0 will be described. The hydraulic oil from the hydraulic pump 14 shown in FIG. 1 through the control valve 16 passes through the rotary joint 11, the hydraulic pipe 20, and the flow rate detector. 1
The oil in the rod chamber returns to the oil tank 34 through the hydraulic hose 12, the hose reel 13, the hydraulic pipe 21, and the rotary joint 11 via the hose reel 13, the hydraulic hose 12, and the bottom chamber of the hydraulic cylinder 10. Thereby, the hydraulic cylinder 10 is extended, and the expanding wing 9b is expanded.

In this case, information indicating that the oil pressure detected by the pressure sensor 22 is higher than the oil pressure detected by the pressure sensor 23, that is, that the oil pressure is being expanded is included in the signal sent from the transmitter 25 to the receiver 26, and the computer 30 is operated. Calculates the stroke of the hydraulic cylinder 10 by performing an operation of adding the flow rate to the integrated value up to that point, and then calculates the expanded diameter from the stroke. On the contrary, when the expansion blade 9b is contracted, the hydraulic oil flows in the opposite route to that described above, and at this time, the computer 30 calculates the stroke of the hydraulic cylinder 10 by performing a calculation process of subtracting the flow rate from the accumulated value up to that point. , Find the bottom diameter from the stroke.

Referring to FIG. 6, step S of starting bottom excavation
Step 5 is a step of inserting the bottom expanding bucket 9 to the bottom of the vertical hole, extending the hydraulic cylinder 10 and rotating the bottom expanding bucket 9 to perform excavation. After this excavation is started, the same processing as step S3 on the ground is performed, and as shown in FIG. 7, the ever-expanding actual bottom diameter and the like are displayed as numerical values, and at the bottom of FIG. The target bottom diameter (indicated by% of the maximum bottom diameter determined by the format in the bottom bucket) is displayed as a ratio to the arrow mark 46 that is the target bottom diameter (step S).
6).

Then, for example, each time the expanded diameter is expanded by a fixed size, the display 32 shown in FIG. 7 is displayed.
The above displayed value is visually confirmed to stop the expansion of the diameter of the bottom expanding bucket 9 and reduce it, and then the bottom expanding bucket 9 is grounded.
Is repeated and is lowered to the bottom of the vertical hole again (usually this operation is repeated about 15 to 20 times). At the same time as the excavation operation in such work, the actual bottom expanding diameter calculating means 36 of FIG. 1 calculates the actual bottom expanding diameter from the hydraulic oil flow rate as described above, and the target bottom expanding diameter set by the keyboard is compared with the comparing means 38. The actual bottom diameter is compared (step S7), and when the actual bottom diameter reaches or exceeds the target bottom diameter, a diameter stop signal is issued (step S8), whereby the relay circuit 39 opens the contact 40 and opens the control valve 16. The hydraulic cylinder 10 is returned to the neutral position, the expansion of the hydraulic cylinder 10 is stopped, and the diameter expansion is stopped. In this case, since the alarm lamp 42 is turned on at the same time,
Notify that the bottom expansion has stopped.

After that, the operation of shaping the wall surface of the enlarged portion while the diameter of the enlarged blade 9b is slightly reduced and the diameter is expanded to the target diameter of the expanded bottom is repeated several times (step S9),
After that, when the excavation of one vertical hole is completed, the recording on the disk is performed and the output display of the printer is performed (steps S10 to S13), and then the operation of one vertical hole is completed. If not (step S14), the process is not terminated, and if the bucket format is the same, step S4
If the bucket format is different, the process returns to step S3.

The present invention can also be applied to the case where the actual bottom diameter is obtained by means of a potentiometer provided in the bottom bucket as in the prior art as means for detecting the actual bottom diameter. However, since muddy water accumulates in the vertical hole during excavation in the ground, if a potentiometer and a flow rate detector 18 are installed in the ground, these devices and their detection signals will be sent to the driver's cab of the pile driver on the ground. There is a risk that equipment such as cables and connectors for leading to will be submerged in water, and water may enter the inside thereof, resulting in measurement failure. However, as in this embodiment, the flow rate detector 18 installed on the ground causes If the actual bottom diameter is detected,
There is no risk of measurement failure due to the influence of water intrusion. Further, since the flow rate detector 18 is provided on the ground, there is no need for a device or member such as a potentiometer or a cable to be inserted in the vertical hole, the detection environment is improved, and failures are reduced.

Further, since the flow rate detector 18 is provided on the rotary side of the rotary joint 11, the flow rate detected by the flow rate detector 18 is not affected by oil leakage in the rotary joint 11, and is supplied to and discharged from the hydraulic cylinder 10. Accurate measurement is possible because it corresponds to the oil flow rate. Further, in this embodiment, since the two relatively inexpensive pressure sensors 22 and 23 are provided, there is an advantage that only one flow rate detector 18 is required.

Further, when the actual bottom diameter is determined by the hydraulic fluid flow rate detector 18, the two flow rate detectors are connected in parallel with a circuit in which check valves having the opposite directions are connected in series to connect the hydraulic pipe 20. , 21 may be inserted.

[0032]

According to the first aspect of the present invention, the actual bottom diameter is compared with the target bottom diameter, and when the actual bottom diameter reaches the target bottom diameter, the expansion of the excavation diameter of the bottom bucket is automatically stopped. By doing so, it is possible to accurately excavate the bottom expansion part of the vertical hole to the target bottom expansion diameter, and prevent excessive digging due to operator's negligence. As a result, it is possible to prevent the energy loss required for the extra excavation and the resource loss due to the extra filling of the excavated hole with concrete.

According to the second aspect, since the actual expanded bottom diameter is detected by detecting the flow rate of the hydraulic oil, and the flow rate detector is provided on the ground, the flow rate detector and its detection signal are transmitted to the body of the pile driver on the ground. There is no risk that water will enter the inside of equipment such as cables and connectors that lead to the operator's cab, resulting in poor measurement. Further, since the flow rate detector is provided on the ground, there is no need for devices and members such as a potentiometer and a cable to be inserted into the vertical hole, so that the detection environment is good and troubles are reduced.

According to the third aspect of the invention, since the flow rate detector of the hydraulic oil is provided on the rotary side of the rotary joint, the oil leak of the rotary joint does not affect the detection value of the flow rate detector, and the bottom of the flow rate detector is expanded. The amount of oil supplied to the hydraulic cylinder for expanding the diameter of the bucket is detected, and accurate measurement can be performed.

[Brief description of the drawings]

FIG. 1 is a hydraulic electric circuit diagram showing an embodiment of the present invention.

FIG. 2 is a side view showing an example of an earth drill to which the present invention is applied.

FIG. 3 is an enlarged side view of a main part of an earth drill showing one embodiment of the present invention.

FIG. 4 is a plan view of the widened bucket according to the embodiment.

FIG. 5 is a configuration diagram of the embodiment.

FIG. 6 is a flowchart for explaining the operation and operation of the present embodiment.

FIG. 7 is a diagram showing a display example of a display in the present embodiment.

[Explanation of symbols]

1: Earth drill body, 2: Boom, 3: Front frame, 3a: Upper frame, 4: Kelly drive device,
5: Kelly bar, 7: Wire rope, 8: Swivel joint, 9: Expanding bucket, 9b: Expanding blade, 10: Hydraulic cylinder for expanding diameter, 11: Rotary joint, 12: Hydraulic hose, 13: Hose reel, 14: Hose Reel stand, 16: control valve, 18: flow rate detector, 20,
21: hydraulic piping, 22, 23: pressure sensor, 24: converter, 25: transmitter, 26: receiver, 27: top sheave, 28: depth detector, 29: depth gauge, 30: computer, 31: printer, 32: Display, 36:
Actual bottom expansion diameter calculating means, 37: Target bottom expansion diameter setting means, 38:
Comparing means, 39: Relay circuit (diameter expansion stopping means), 40:
Expansion stop contact, 42: alarm lamp, 43: operation switch

Claims (3)

[Claims] 1. A comparison for comparing an actual bottom diameter with an actual bottom diameter detecting means for detecting an actual bottom diameter formed by the bottom blade of a bottom bucket opened and closed by a diameter expanding hydraulic cylinder, and comparing the actual bottom diameter with a target bottom diameter. Means and a diameter expansion stopping means for stopping the operation of the diameter expansion hydraulic cylinder in the diameter expansion direction when the actual diameter expansion diameter reaches the target diameter expansion diameter. Excavation control device. 2. The flow rate detector installed on the ground according to claim 1, wherein the actual bottom expansion diameter detecting means detects the flow rate of the working oil to the diameter expansion hydraulic cylinder for opening and closing the expansion blades of the bottom expansion bucket. An excavation control device for a bottomed earth drill, comprising: an arithmetic means for obtaining an actual bottom diameter of the enlarged blade from an output signal of the flow rate detector. 3. The excavation of a bottomed earth drill according to claim 2, wherein the flow rate detector is installed on a rotating side of a rotary joint that supplies hydraulic oil to a diameter-expanding hydraulic cylinder of the bottoming bucket. Control device.