JP2002327588A - Earth drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth drill making it possible to easily select either earth drill work or hammer grab work, depending on whether the ground is weak or hard, for the discharge of sediment in a easing used in all-casing construction method. SOLUTION: The earth drill is an excavator for excavating a pile hole for a cast-in-place pile. In the earth drill, a boom 2 that can be raised and lowered is provided with a front frame 17 carrying a Kelley's bar drive 22 and a Kelley's bar 5 with an excavating bucket 20 mounted at its lower end is suspended by a winch driven by a hydraulic motor provided on a base machine 1. Another winch for suspending a hammer grab 25 or a hammer crown 26 is added to the base machine 1 and the hammer grab is suspended by still another winch which is different from the winch suspending the Kelley's bar 5. The winch for suspending the hammer grab or the hammer crown is used for hoisting a reinforcing cage or the like during the earth drill work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kelly bar driving device in which a kerry bar having a cutting bucket attached to a lower end thereof is hung on an up-and-down boom provided at a front portion of a base machine and mounted on a front frame provided on the boom. The present invention relates to an earth drill for driving a keriba to drill a pile hole.

[0002]

2. Description of the Related Art As shown in FIG. 10, as a cast-in-place pile construction machine, a kelly bar 5 having an excavation bucket 20 attached to a lower end thereof is provided at a front portion of a base machine 1 so as to be able to move up and down.
There is known an earth drill that hangs the cradle 5 and drills a pile hole by driving the keriba 5 by a keriba driving device 22 mounted on a front frame 17 provided on the boom 2.

[0003] The base machine 1 has a first winch 6 for suspending the keriba 5, a second winch 7 for suspending a reinforcing bar and a torsion tube, and a third winch 8 for raising and lowering the boom 2. The drive is performed by a hydraulic motor. As shown in FIG. 11, a hydraulic system of the winch includes a hydraulic pump 31 driven by an engine 30,
From 32, pressure oil is supplied to the hydraulic motor 35 of the first winch 6, the hydraulic motor 36 of the second winch 7, and the hydraulic motor 37 of the third winch 8 via the switching valves 47 and 48, respectively.

[0004] The hydraulic pumps 31 and 32 also supply hydraulic oil to a hydraulic motor for traveling and to a hydraulic motor 38 of the kelever drive device 22. Although not shown, a hydraulic motor for turning the upper body of the base machine 1 and a hydraulic pump for operating the support cylinder 18, the thruster cylinder, the outrigger cylinder, and the like of the front frame 17 are separately provided. .

[0005] When performing a crane operation such as hanging a reinforcing rod cage or a torsion tube, the support cylinder 18 is extended to pull the front frame 17 toward the boom 2 and the second
The wire rope 12 wound around the winch 7 is suspended by a crane hook 23 attached to the tip end.

On the other hand, as an apparatus for constructing a cast-in-place pile by the all-casing method, the sediment in the casing is discharged while holding the casing and pushing it into the ground while swinging or rotating, and concrete is inserted by inserting a reinforcing bar or the like. There is known a casing driver 60 (FIG. 10) that pulls out a casing while driving to form a cast-in-place pile. The casing driver 60 is generally of a stationary type, and is suspended and moved to a position of a pile hole to be constructed by a movable crane. Also, the casing 6
A mobile crane equipped with a hammer grab is generally used for discharging the earth and sand in 1.

[0007]

Even if the earth and sand in the casing is fairly hard, it is possible to discharge with a hammer grab. However, since the amount of discharge per hammer grab is small,
Takes time. Therefore, when the ground is soft, the earth and sand in the casing is discharged by an earth drill, which has a large amount of discharge per time.

However, in the case of using an earth drill, drilling cannot be performed when a hard ground layer is encountered. Therefore, the earth drill must be temporarily retreated and replaced with a crane equipped with a hammer grab. For this reason, it is necessary to keep a crane equipped with a hammer club near the construction site.

[0009] Therefore, there is a demand for an earth drill which can be equipped with a hamag lab so that when the ground is hard, the earth can be removed from the casing by the hamag lab. By the way, as described above, the earth drill is equipped with a first winch for suspending a keriba, a second winch for suspending a reinforcing bar or the like, and a third winch for holding a boom at a predetermined angle. In order to equip it, a winch for suspending the hammer club and hammer crown (to release the claws of the hammer club when the hammer club grabs and pulls up the earth and sand) is required, and a space for additionally installing the winch is required. Must be secured.

Although a space for mounting the winch can be secured by extending the frame of the base machine backward, there is a problem that the work site where the winch can be carried is limited because the turning radius of the upper body becomes large. In addition, when a winch is added, piping such as a hydraulic hose also increases, which may lead to complicated routing.

[0011] It is possible to remove the keriba and attach the hammer club without adding a winch. However, it takes time to remove the keriba, and when the middle ground is temporarily hard, the keriba is removed. Is repeated, and the efficiency is rather poor, which is not preferable.

In view of the above, the present invention provides a method for easily installing a hammer rub without removing a keeliba and discharging earth and sand in a casing in an all casing method using an earth drill according to a case where the ground is soft and a case where the ground is hard. It is an object of the present invention to provide an earth drill that can be easily switched between a work by a hammer club and a work by a hammer club.

[0013]

To achieve the above object, the present invention employs the following means. That is, the base machine is provided with a winch for suspending a kelly bar having a drilling bucket attached to a lower end thereof, and a winch for suspending a steel cage in a pile hole, and the kelly bar driving device mounted on a front frame provided on a boom drives the keliver. In an earth drill for drilling a pile hole, a winch for suspending a hammer club or a hammer crown is added to a base machine to suspend the hammer club with a winch different from the winch for suspending a keriba. It is characterized in that a winch for suspending a steel bar is used for suspending a steel cage basket when working with an earth drill.

[0014] The earth drill has a first winch for suspending a keriba, a second winch for suspending a reinforcing bar or the like,
Although a third winch for holding the boom at a predetermined angle is mounted, a winch for suspending the hammer club and the hammer crown is separately required to equip the hammer club.

In the present invention, one of the winch for suspending the hammer club or the winch for suspending the hammer crown is used in common with a winch for suspending a reinforcing bar or the like during an earth drill operation, and one additional winch is used. It was done. Where the winch is added is not particularly limited. For example, since the third winch holding the boom is generally of a narrow width, it may be placed in parallel with the third winch, or the first or second winch may be placed in parallel with a reduced width. It may be. Also, it may be mounted on the lower part of the boom or on the front frame.

When mounted on the lower part of the front frame or the boom, the hydraulic motor for driving the keriba of the front frame and the hydraulic hose of the thruster cylinder for pushing the keriba are routed. Hoses must not interfere with this.

When a winch is separately added, it is desirable to install the winch below the space and piping boom. In this case, as described in claim 2, the hydraulic motor of the winch mounted on the lower part of the boom is driven by switching the hydraulic oil to the hydraulic motor of the kelever drive device to drive the hydraulic motor from the switching valve. The hydraulic hose can be shared with the hydraulic hose for the front frame, which can be simplified.

The switching of the hydraulic oil between the hydraulic motor for the winch at the bottom of the boom and the hydraulic motor for driving the keriba is generally performed by a switching valve. It is desirable to use them in combination. In addition, since the logic valve also becomes large when the flow rate increases, the winding upper side of the hydraulic motor of the winch mounted on the lower part of the boom and the kelly bar of the hydraulic motor of the kelever driving device are configured as described in claim 3. A logic valve is provided in the flow path of the pressure oil on the side of the forward rotation, and a solenoid valve that connects to the flow path that supplies the pressure oil and opens one of the logic valves and closes the other is provided via a shuttle valve. In this case, only two logic valves are required, and the installation space can be reduced.

Further, in the construction of the all-casing method using a stationary casing driver, the casing driver is moved by a crane. It is more desirable that this operation can be performed by an earth drill. In this case, the first winch is arranged at the front of the base machine and the second winch is arranged behind the first winch, and the third winch and the fifth winch are moved rearward of the second winch. Placed in the same row, and further placed the fourth winch at the bottom of the boom,
Suspending the keriba on one of the first winch or the second winch, suspending the hammer club and the hammer crown on the other of the first winch or the second winch and the fourth winch,
It is preferable that the winch and the fifth winch support a boom and suspend heavy objects such as a casing driver. In addition, a winch wire rope for hanging a heavy load is used in a large number of turns.

Accordingly, the size of the base machine can be made the same as that of the conventional machine, so that the work by the ground drill, the work by the hammer club and the movement of the casing driver can be performed by one machine.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. Note that components and members that are the same as those of the above-described conventional example shown in FIGS. 10 and 11 are denoted by the same reference numerals.

In FIG. 1, 1 is a base machine, 2 is a boom, 4 is a counterweight, and 5 is a keriba. The boom 2 is provided with a front frame 17 on which a keriba driving device 22 is mounted. A sheave 27 for suspending the hammer club 25 and the hammer crown 26 protrudes from the end of the boom 2.

FIG. 1 shows a state in which the excavating bucket 20 is detached from the kerry bar 5, and the hammer club 25 is suspended to excavate earth and sand in the casing 61 of the casing driver 60. In the base machine 1, a first winch 6 and a second winch 7 are arranged in parallel from the front side, and a third winch 8 and a fifth winch 10 are arranged in the same row behind the second winch 7. Further, a fourth winch 9 is arranged below the boom 2.

As shown in FIG. 2, the wire rope 11 of the first winch 6 is connected to the hammer club 25 via the sheave 27, the wire rope 12 of the second winch 7 is connected to the kelly bar 5, and the wire rope of the fourth winch 9 is connected to the wire rope. 15 is sheave 2
7, the hammer crown 26 is suspended.

The wire rope 1 of the fifth winch 10
Reference numeral 3 denotes a crane hook 24 wound in a large number for hanging a heavy object such as a casing driver 60, and a third winch is engaged with a back end of the boom 2 although not shown.
With this configuration, when the casing driver 60 is excavating soft ground, the Keriba 5
The excavation bucket 20 is attached to the end of the casing, and the keriba 5 is set so as to be vertical.
The base machine 1 is moved so as to be located at the center of.
Then, while lowering the second winch 7, the keriba driving device 22 is driven to excavate the earth and sand in the casing 61 and store it in the excavation bucket 20. I do.

When it hits the hard ground, as shown in FIG. 1, the excavating bucket 20 is removed from the kerry bar 5, the support cylinder 18 is extended, and the front frame 17 is drawn toward the boom 2. Then, the hammer club 25 is hung on the wire rope 11 of the first winch 6 and the hammer crown 26 is attached to the wire rope 15 of the fourth winch 9. These operations can be easily performed on the ground surface.

Next, the first winch 6 is operated to drop the hammer grab 25, crush the hard ground, and grasp and discharge the crushed earth and sand. When performing a crane operation such as hanging a reinforced basket or a tormi tube, the hammer club 25 and the hammer crown 26 are removed from the state shown in FIG. 1 and are hung by the second winch 7 or the fourth winch.

When the casing driver 60 is moved to the next excavation position, the casing driver 60 is suspended by the hook 24 attached to the wire rope 13 of the fifth winch 10 in this state.
Since the wire rope 13 has a large number of hooks, a heavy object such as a casing driver can be sufficiently hung.

FIG. 3 shows the hydraulic system of the winch of the earth drill. The hydraulic motor 35 of the first winch 6 is supplied from hydraulic pumps 31 and 32 driven by the engine 30 via switching valves 33 and 34, respectively. , 2nd winch 7
Hydraulic motor 36, the third winch 8 hydraulic motor 37,
The hydraulic motor 39 of the fourth winch 9, the hydraulic motor 40 of the fifth winch 10, and the hydraulic motor 3 of the keriba driving device.
8 is supplied with pressurized oil. In addition, this hydraulic pump 31,
The pressure oil is also supplied from 32 to a hydraulic motor for traveling.

The hydraulic motor 39 of the fourth winch 9
The pressurized oil to the hydraulic motor 38 of the keriba drive device is connected via a switching device 50. In addition, Hamagurabu 2
The hydraulic oil to the hydraulic motor 35 of the first winch 6 for suspending the 5 and the hydraulic motor 36 of the second winch 7 for suspending the keriba 5 and the hydraulic motor 38 of the keriba driving device or the hydraulic motor 39 of the fourth winch 9 The flow rates of the hydraulic pump 31 and the hydraulic pump 32 are merged on the discharge side of the switching valve 33 and the switching valve 34.

Therefore, these hydraulic motors can double the flow rate supplied when either one of the switching valves 33, 34 is operated or when both are operated.
The switching device 50 is, as shown in FIG.
The hydraulic motor 38 of the second winch and the hydraulic motor 39 of the fourth winch 9
And logic valves 43, 44, 45, 46 provided on the supply side and the discharge side (reverse during reverse rotation), and electromagnetic valves 41, 42 for opening and closing the logic valves 43 to 46, respectively. .

In FIG. 4, A and B are switching valves 33, 3
When hydraulic oil is supplied to A in the flow path supplied from both or one of the hydraulic motors 4, the hydraulic motor 38 rotates forward or the hydraulic motor 3
9 rotates to the winding side. When the pressure oil is supplied to B, the hydraulic motor 38 rotates reversely or the hydraulic motor 39 rotates to the lowering side.

When the kelly bar 5 is driven in the normal rotation, the solenoid valves 41 and 42 are set in the state shown in FIG. As a result, the pressure oil closes the logic valve 43 through the electromagnetic valve 41, so that the pressure oil is not supplied to the hydraulic motor 39 but is supplied from the logic valve 45 to the hydraulic motor 38 through the flow path 38a. The oil discharged from the hydraulic motor 38 is returned from the flow path B to the oil tank through the logic valve 46 through the flow path 38b.

When the hammer crown 26 is to be wound, the solenoid valve 41 is switched from the state shown in FIG. As a result, the pressure oil closes the logic valve 45 through the electromagnetic valve 41, so that the pressure oil is not supplied to the hydraulic motor 38 but is supplied from the logic valve 43 to the hydraulic motor 39 through the flow path 39 a.

When the kelly bar 5 is reversed, the hydraulic oil is supplied to the flow path B while the solenoid valves 41 and 42 remain in the state shown in FIG. As a result, the pressure oil closes the logic valve 44 through the electromagnetic valve 42, so that the pressure oil is not supplied to the hydraulic motor 39 but is supplied from the logic valve 46 to the hydraulic motor 38 through the flow path 38b.

In order to lower the hammer crown 26, the solenoid valve 42 is switched from the state shown in FIG. As a result, the pressure oil closes the logic valve 46 through the electromagnetic valve 42, so that the pressure oil
Is supplied from the logic valve 44 to the hydraulic motor 39 through the flow path 39b.

When the switching device 50 is configured as described above, the solenoid valves 41 and 42 only close the logic valves 43 to 46, so that they may be small and the solenoid valves 41 and 42 may be small.
The switching device 50 can be made more compact as compared with the case where switching is performed only with the switching device 42. However, the logic valves 43 to 46 require four large flow rates, so that a certain installation space is required.

FIG. 5 shows an embodiment of a switching device 50 in which the number of logic valves is two and the installation space is further reduced.
The switching device 50 is provided with a logic valve in the flow path 38a on the supply side of the hydraulic oil when the hydraulic motor 38 of the kelever drive device 22 rotates forward and the hydraulic oil supply side when the hydraulic motor 39 of the fourth winch 9 hoists. 53 and 54 are provided.
An electromagnetic valve 5 that opens and closes the valves 3 and 54 is connected via a shuttle valve 52 to channels A and B that supply pressure oil.

When the kelly bar 5 is driven to rotate forward, the solenoid valve 51 is set in the state shown in FIG. As a result, the pressure oil closes the logic valve 53 through the flow path 53a as shown in FIG.
Is supplied from the logic valve 54 to the hydraulic motor 38 through the flow path 38a. The oil discharged from the hydraulic motor 38 is returned from the flow path 38b to the oil tank through the flow path B.

When the hammer crown 26 is to be wound, the solenoid valve 51 is switched to supply pressure oil to the flow path A.
As a result, as shown in FIG. 7, the pressure oil closes the logic valve 54 through the flow path 54a, so that the pressure oil is not supplied to the hydraulic motor 38, but is supplied from the logic valve 53 to the flow path 39a.
And supplied to the hydraulic motor 39.

When the kelly bar 5 is reversed, the solenoid valve 51 is set in the state shown in FIG.
As a result, the hydraulic oil passes through the flow path 53a to close the logic valve 53 as shown in FIG. 8, so that the hydraulic motor 39 does not rotate, and the hydraulic oil flows through the flow path 38b.
Supplied to In this case, a high pressure is applied to the supply port and the discharge port of the hydraulic motor 39, but there is no problem because the frequency of using the reverse rotation of the kelly bar 5 is small.

When lowering the hammer crown 26, the solenoid valve 51 is switched from the state shown in FIG. As a result, as shown in FIG. 9, the hydraulic oil closes the logic valve 54 through the flow path 54a, so that the hydraulic motor 38 is not rotated, and the hydraulic oil is supplied to the hydraulic motor 39 through the flow path 39b. . In this case as well, pressure is applied to the supply port and the discharge port of the hydraulic motor 38. However, when the hammer crown 26 is lowered, the pressure is low, so there is no problem.

In the above embodiment, the hammer club 25 is suspended by the first winch 6, the kelly bar 5 is suspended by the second winch 7, and the hammer crown 26 is suspended by the fourth winch 9.
However, the hammer crown 26 may be hung by the first winch 6 and the hammer club 25 may be hung by the fourth winch 9. Alternatively, the first winch 6 may suspend the keriba 5, the second winch 7 may suspend the hammer club 25 or the hammer crown 26, and the fourth winch 9 may suspend the hammer crown 26 or the hammer club 25. .

[0044]

As described above, the earth drill according to the first aspect of the present invention uses a winch for suspending a hammer club or a hammer crown on a base machine and a winch different from the winch for suspending a keriba. The winch that suspends the hammer club and the hammer crown and the hammer crown is used for suspending steel cages during the work of the earth drill, so it is only necessary to add one winch to the conventional earth drill. The operation can be switched to the hammer club operation with the Keriva attached, and the efficiency of the earth discharging operation in the casing in the all casing method can be improved.

Further, as described in claim 2, an additional winch is mounted on the lower part of the boom, and the hydraulic motor of this winch is switched by switching the hydraulic oil to the hydraulic motor of the kelever driving device. The hydraulic hose from the valve to the hydraulic motor can be shared with the hydraulic hose to the front frame, simplifying piping.

The means for switching the pressure oil is provided between the winding side of the winch hydraulic motor and the flow path of the pressure oil on the side of the hydraulic motor of the kelly bar driving device on which the kelly bar is normally rotated. If a logic valve is provided and connected to a flow path for supplying pressure oil to open one of the logic valves and close the other by providing a solenoid valve via a shuttle valve, two logic valves can be used. Installation, and installation space can be reduced.

Further, if a winch for suspending a heavy object such as a casing driver is further added as described in claim 4, a heavy casing driver can be moved, and all the crane work in the all casing method can be covered by this earth drill. And eliminates the need to place another crane.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire earth drill as an embodiment of the present invention.

FIG. 2 is a diagram showing a wire rope hanging of the winch.

FIG. 3 is a hydraulic diagram of a winch of the earth drill.

FIG. 4 is a hydraulic system diagram showing an embodiment of the switching device 50 of FIG.

FIG. 5 is a hydraulic system diagram showing another embodiment of the switching device 50 of FIG. 3;

FIG. 6 is a diagram showing a flow of pressure oil when the kelly bar is driven to rotate forward.

FIG. 7 is a diagram showing a flow of pressure oil when the hammer crown is wound up.

FIG. 8 is a diagram showing a flow of pressure oil when the kelly bar is driven in reverse rotation.

FIG. 9 is a diagram showing a flow of pressure oil when the hammer crown is wound down.

FIG. 10 is a side view showing the entire conventional ground drill.

FIG. 11 is a hydraulic system diagram of the winch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base machine 2 ... Boom 4 ... Counterweight 5 ... Keliva 6 ... 1st winch 7 ... 2nd winch 8 ... 3rd winch 9 ... 4th winch 10 ... 5th winch 11, 12, 13, 14, 15 ... Wire Rope 17 Front frame 18 Support cylinder 20 Excavating bucket 22 Keriva driving device 23, 24 Crane hook 25 Hammer club 26 Hammer crown 27 Sheave 30 Engine 31, 32 Hydraulic pump 33, 34 Switching valve 35 , 36, 37, 38, 39, 40 ... Hydraulic motors 38a, 38b, 39a, 39b ... Flow paths 41, 42 ... Solenoid valves 43, 44, 45, 46 ... Logic valves 47, 48 ... Switching valves 50 ... Switching means 51 ... solenoid valve 52 ... shuttle valve 53, 54 ... logic valve 53a, 54a ... flow path 60 ... casing Liver 61 ... Casing

Continuation of the front page (72) Inventor Shigemitsu Yoshida 1-1, Sanbonmatsucho, Atsuta-ku, Nagoya-shi, Aichi Japan Inside the Vehicle Manufacturing Co., Ltd. (72) Inventor Shigenori Kikuchi 1-1-1, Sanbonmatsucho, Atsuta-ku, Nagoya-shi, Aichi Japan Manufacturing Co., Ltd. F-term (reference) 2D029 GA00 PA01 PA05 PB05 PC01 PD02

Claims (4)

[Claims] A base machine is provided with a winch for suspending a keriba having a drilling bucket attached to a lower end thereof, and a winch for suspending a reinforced cage in a pile hole, and the keriba is mounted on a front frame provided on a boom by a keriba driving device. In an earth drill that drives and drills a pile hole, a winch for suspending a hammer club or a hammer crown is added to a base machine to suspend a hammer club with a winch that is different from a winch that suspends a keriba. An earth drill characterized in that a winch for suspending a hammer crown is used for suspending a steel cage basket when working on the earth drill. 2. A winch for suspending a hammer club or a hammer crown is mounted on a lower portion of a boom, and a hydraulic motor of the winch is driven by switching hydraulic oil to a hydraulic motor of a kelever driving device. The earth drill according to claim 1, wherein: 3. A logic valve is provided in the pressure oil flow path on the winding side of the hydraulic motor of the winch mounted on the lower part of the boom and in the pressure oil flow path on the side of the hydraulic motor of the kelever driving device for rotating the kelly bar in the forward direction, and supplies the hydraulic oil. 3. The earth drill according to claim 2, further comprising an electromagnetic valve connected to a flow path for opening one of the logic valves and closing the other of the logic valves via a shuttle valve. 4. A first winch is arranged at the front of the base machine, a second winch is arranged behind the first winch, and a third winch and a fifth winch are arranged behind the second winch in the same row. Placing a four winch at the bottom of the boom, suspending the keriba on one of the first or second winches, suspending the hammer club and hammer crown on the other of the first or second winch and the fourth winch, The earth drill according to claim 1, wherein a heavy object such as a boom support and a casing driver is suspended by the third winch and the fifth winch.