JP3351762B2 - Self-propelled all-casing excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an all-casing excavator used for cast-in-place pile construction for constructing a foundation pile.

[0002]

2. Description of the Related Art A cast-in-place type all-casing method is often used for cast-in-place pile construction for constructing a foundation pile.
This is, after gripping and rotating the casing tube by the tubing device and pushing it into the ground, removing the earth and sand in the casing tube by a hammer grab etc. to form a foundation pile hole, after performing predetermined allowances such as insertion of rebar While casting concrete in the casing tube,
The gripped casing tube is gradually pulled out to form a cast-in-place pile.

[0003] As shown in FIG.
A plurality of wedge-shaped chuck members 4 are suspended from a rotating ring 6 around the outer periphery of the casing tube 1, and the rotating ring 6 is rotatably supported on an upper frame 8 via a bearing 2. The upper frame 8 is connected to the lifting frame 12 by a plurality of chuck cylinders 14. A rotating body 16 is provided on the lifting frame 12 to insert the casing tube 1 together with the chuck member 4.
Numeral 6 is rotatably supported on the lifting frame 12 via the bearing 3 and is configured to be rotationally driven by a plurality of hydraulic motors 18.

The lifting frame 12 is raised and lowered by lifting cylinders 17 provided at four corners of a base frame 20. Further, jacks 19 for level adjustment are provided at four corners on the bottom surface of the base frame 20. The left half of FIG. 4 shows a state in which the chuck cylinder 14 is contracted to grip the casing tube 1 with the chuck member 4, and the right half shows a state in which the casing tube 1 is not gripped.

In a stationary all-casing excavator, a power unit for driving a tubing device is separately installed near the excavator. The power unit includes an engine, a hydraulic pump, a hydraulic tank, a valve, and the like, and is connected to the tubing device by a hydraulic hose and an electric wire.

As shown in FIG. 7, a hydraulic circuit of a casing excavator generally has a gear box 42 provided on an output shaft of an engine 41 and hydraulic pumps 50 and 43 provided on the gear shaft. The hydraulic pump 43 is for driving a plurality of hydraulic motors 18 for rotating the casing tube 1, and is connected to the plurality of hydraulic motors 18 in parallel via an electromagnetic switching valve 18a. The hydraulic pump 43 is generally of a variable displacement type and requires a large amount of discharge, so that a plurality of hydraulic pumps 43 are often used. 43a is a relief valve.

The hydraulic pump 50 includes a chuck cylinder 14,
A drive source for operating the lifting cylinder 17 and the horizontal jack 19, and the solenoid-operated switching valves 14a, 17 connected in series.
a and 19a. These cylinders do not work simultaneously.

In a stationary all-casing excavator, 1
When the construction of the pile is completed and the pile is to be moved to the next pile construction site, the pile is lifted by a crane. However, depending on the work site, a crane that only suspends the tubing device may not be used. Then, there is a thing which enabled self-propelled to the pile construction site.

In the self-propelled all-casing excavator, as shown in FIG. 2, crawler-type traveling bodies 30 are detachably mounted on the left and right sides of a base frame 20 of a tubing device, and a power unit is separately installed and suspended by a crane. 3, and as shown in FIG. 3, a frame 35 is attached to the rear of the base frame 20 and a power unit 40 including a driving source for traveling is mounted. 36 is a bracket for mounting the gantry 35. The driving source for traveling uses a driving source of the tubing device, for example, as shown in FIG.

That is, hydraulic pumps 21, 22 and 43 are attached to the respective gear shafts of a gear box 42 provided on the output shaft of the engine 41, and the hydraulic pump 43 is provided with a plurality of hydraulic switches via the electromagnetic switching valve 18a as in FIG. It is connected to the hydraulic motor 18 in parallel. The hydraulic pumps 21 and 22 are of variable displacement type and have the same capacity, and hydraulic motors 23 and 24 for driving left and right traveling.
Are connected via electromagnetic switching valves 23d and 24d, respectively. The hydraulic pump 21 is connected to the chuck cylinder 14, the elevating cylinder 17, and the horizontal jack 19 via electromagnetic switching valves 14a, 17a, and 19a, respectively. 23b and 24b are brake valves, 2
1a and 22a are relief valves.

That is, the hydraulic pump for operating each cylinder of the tubing device is replaced with two variable displacement pumps for use in traveling drive, and one of them is further used for operating each cylinder. .

[0012]

However, such a conventional self-propelled all-casing excavator requires a drastic change in the hydraulic circuit configuration in order to replace a stationary one with a self-propelled one. For this reason, it is costly and time-consuming to change the stationary type to the mobile type, and once it is changed to the mobile type, it is practically difficult to return to the fixed type. It is owned and used by selecting as appropriate for the construction site. However, there are not many places where work cannot be performed unless a mobile type is used, and there is a problem that it is difficult to use a small place because of the size of the apparatus.

Therefore, the present invention provides a stationary all-casing excavator which can be easily changed to a self-propelled all-casing excavator by adding a hydraulic circuit for traveling without changing the hydraulic circuit as much as possible. It is an object of the present invention to provide a self-propelled all-casing excavator that can be easily returned to a home.

[0014]

In order to achieve the above object, the present invention employs the following means. That is, in a self-propelled all-casing excavator provided with a crawler-type traveling body in a tubing device that grips a casing tube and pushes it into the ground while swinging or rotating, any one of a plurality of hydraulic pumps that drive the tubing device is used. Pressure oil is supplied to the left and right hydraulic motors of the traveling body via switching valves provided in parallel with each other.

The all-casing excavator holds the casing and swings or rotates it while pushing it into the ground,
Elevator frame with mechanism to grip and rotate casing is lifted up and down by lifting cylinders set up at four corners of base frame to remove foundation and soil in casing by hammer grab etc. to form foundation pile hole It comprises a tubing device provided as possible and a power unit for operating the tubing device. The power unit includes a plurality of hydraulic pumps for gripping, pushing, pulling out, rotating, and the like of the casing.

Some self-propelled all-casing excavators are equipped with a power unit and others are not. However, the present invention can be used for both. The hydraulic motor for driving the traveling body is driven using any one of a plurality of hydraulic pumps for operating the tubing device.

This is not limited to the one in which the pressure oil is introduced from one hydraulic pump. For example, two hydraulic pumps that supply pressure oil to a hydraulic motor that rotates the casing are provided when a large discharge amount is required, and the discharge oils of both hydraulic pumps are merged. The pressure oil in the flow path is used for the hydraulic motor of the traveling body.

When a crawler-type traveling body is driven by a hydraulic motor, a hydraulic circuit is provided with two hydraulic pumps corresponding to the left and right hydraulic motors and sends hydraulic oil of the same capacity, as is often the case with construction machines. Even if the left and right running resistances are different, the vehicle will go straight. A major feature of the present invention is that pressure oil is sent from one hydraulic pump to the left and right hydraulic motors. By adopting this configuration, the configuration of the hydraulic circuit is simplified, and the stationary all-casing excavator can easily be replaced with a self-propelled all-casing excavator.
The self-propelled type can be easily returned to the stationary type.

Regarding the straight running performance, the all casing excavator has a symmetrical tubing device mounted on the traveling body on both sides, the center of gravity is located substantially at the center, and the traveling ground is not very rough. In addition, the hydraulic motors 23 and 24 for traveling on both sides receive substantially the same running resistance, so that the vehicle can travel straight without any particular flow control without supplying a flow of the same capacity to the hydraulic motors 23 and 24.

Further, if a manual switching valve for switching the pressure oil to the left and right hydraulic motors is provided on the discharge side of the switching valve for operating the tubing device, no additional work such as electric wiring is required. In addition, the tubing device can be operated immediately after traveling, and the efficiency is improved.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. The configuration of the self-propelled all-casing excavator is the same as that of FIG. 2 or 3 described above.
That is, a crawler-type traveling body 30 is detachably attached to the left and right sides of the base frame 20 of the tubing device, and its drive wheels are provided with hydraulic motors.

The power unit may be moved separately by hanging it with a crane or, as shown in FIG. 3, a base 35 may be provided at the rear of the base frame 20 by a bracket 36 so as to be removable. A power unit 40 including a power unit may be mounted.

A hydraulic circuit of the self-propelled all-casing excavator will be described with reference to FIG. This hydraulic circuit is configured as it is without changing the stationary hydraulic circuit described in FIG. That is, a gear box 42 is provided on the output shaft of the engine 41, and the hydraulic pumps 50 and 43 are connected to the respective gear shafts.
are connected in parallel to a plurality of hydraulic motors 18 for rotating the casing tube 1 via a. And
The hydraulic pump 50 is connected to the chuck cylinder 14, the elevating cylinder 17, and the horizontal jack 19 by the electromagnetic switching valve 14a,
17a, 19a are connected. Then, a circuit for traveling is attached to this. That is, a switching valve 25 is provided in a circuit to the lifting cylinder 17 for pushing and pulling out the casing, and a switching valve 25 in a flow path 51 from the discharge side of the electromagnetic switching valve 17a to the head side (drawing side of the casing) of the lifting cylinder. One of the valves 25 is connected to the head side of the elevating cylinder 17 and the other is connected to the switching valves 23a and 24a via the flow path 53. The switching valves 23a and 24a are connected in parallel to the left and right traveling motors 23 and 24, respectively. The return sides of the hydraulic motors 23 and 24 are connected to a flow path 52 connected to the rod side of the elevating cylinder 17 via a flow path 55 and a flow path 56 and a check valve 27. In addition, the flow path 53 and the flow path 56 are connected by a flow path 54, and the flow path 54
Is provided with a throttle valve 26.

The switching valves 23a and 24a, the switching valve 2
5, the throttle valve 26 and the check valve 27 are formed as a traveling unit, and the couplings 31a and 31b and the coupling 32a provided in the flow path 51 and the flow path 52;
It is removable at 32b.

Therefore, when the stationary unit is used, hoses for pushing and pulling out from the power unit are directly connected to the couplings 32a and 32b on the lifting cylinder 17 side. The hose for pushing and pulling out from the power unit is connected to the couplings 31a and 31b of the traveling unit, and the hose from the traveling unit is coupled to the coupling 32 on the lifting cylinder 17 side.
a, 32b.

During operation of the tubing device, the switching valve 25 is in communication with the head side of the elevating cylinder 17, and the operation is performed by operating the electromagnetic switching valves 14a, 17a, 18a, and 19a in the same manner as in the prior art. For example, when pushing the casing, as shown in FIG. 5, the electromagnetic switching valve 18a is operated to operate the hydraulic motor 18 to rotate the casing, and the switching valve 17a is operated to operate the hydraulic pump 50.
Is sent to the rod side of the lifting cylinder 17. As a result, the oil on the head side of the lifting cylinder 17 is sent from the flow path 51 to the return port of the electromagnetic switching valve 17a via the switching valve 25, and the lifting cylinder 17 pushes the casing.

Next, when traveling, as shown in FIG. 6, the switching valve 25 is switched to the flow path 53 side, and the electromagnetic switching valve 1
7a is operated to the pull-out side. When driving,
All the other electromagnetic switching valves 14a, 18a, and 19a are in the neutral position. Thus, the pressure oil of the hydraulic pump 50 flows to the flow path 51 toward the head of the lifting cylinder 17 and is sent from the switching valve 25 to the switching valves 23a and 24a through the flow path 53.

Therefore, when traveling straight, the switching valve 2
By operating 3a and 24a, the traveling hydraulic motors 23 and 24 are driven to travel. When traveling on a curve, the vehicle travels by operating one of the switching valves 23a and 24a to drive the hydraulic motor 23 or 24. When performing a spin turn, the switching valves 23a, 24a
Are operated in reverse to drive the hydraulic motors 23 and 24. Further, when traveling at a very low speed, the throttle valve 26 is operated to reduce the flow rate to the switching valves 23a and 24a.

In the above-described embodiment, the description has been given of the case where the running hydraulic oil is obtained from the discharge side of the switching valve of the lifting / lowering cylinder. However, the switching of other actuators in the pressure line of the hydraulic pump 50 or 43 is performed. It can be obtained from the discharge side of the valve. This may be appropriately selected depending on the relationship with the capacity of the traveling drive hydraulic motor, and the like.

As described above, the present invention is not limited to such embodiments at all, and can be implemented in various modes without departing from the gist of the present invention.

[0031]

As described above, the self-propelled all-casing excavator according to the present invention provides any one of a plurality of hydraulic pumps for driving a tubing device by supplying one of the hydraulic oils in parallel to the left and right hydraulic motors of the traveling body. Since the supply is performed via the switching valve provided in the, the configuration of the hydraulic circuit is simplified, and the stationary all-casing excavator can easily be a self-propelled all-casing excavator. It can be easily returned to the stationary type.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram as one embodiment of a self-propelled all-casing excavator of the present invention.

FIG. 2 is a side view of a self-propelled all-casing excavator.

FIG. 3 is a side view of a self-propelled all-casing excavator equipped with a power unit.

FIG. 4 is an explanatory view of a mechanism of the tubing device.

FIG. 5 is an operation system diagram in a case where a casing is pushed in by the hydraulic circuit of FIG. 1;

FIG. 6 is an operation system diagram during the traveling.

FIG. 7 is a hydraulic circuit diagram of a conventional stationary all-casing excavator.

FIG. 8 is a hydraulic circuit diagram of a conventional self-propelled all-casing excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Casing tube 2 ... Bearing 3 ... Bearing 4 ... Chuck member 6 ... Rotating ring 8 ... Upper frame 12 ... Elevating frame 14 ... Chuck cylinder 14a ... Electromagnetic switching valve 16 ... Rotating body 17 ... Elevating cylinder 17a ... Electromagnetic switching valve 18 ... Hydraulic motor 18a Electromagnetic switching valve 19 Jack 19a Electromagnetic switching valve 20 Base frame 21, 22 Hydraulic pump 21a, 22a Relief valve 23, 24 Hydraulic motor 23a, 24a Switching valve 23b, 24b Brake valve 25 ... Switching valve 26 ... Throttle valve 27 ... Check valve 28 ... Relief valve 30 ... Traveling body 31a, 31b, 32a, 32b ... Coupling 35 ... Base 36 ... Bracket 40 ... Power unit 41 ... Engine 42 ... Gear box 43 ... Hydraulic pump 43a ... relief valve 50 ... hydraulic port Flop 50a ... relief valve 51 to 55 ... the flow path

Claims (2)

(57) [Claims] 1. A self-propelled all-casing excavator in which a crawler-type traveling body is provided in a tubing device that pushes a casing tube while holding and swinging or rotating the ground in a ground, any one of a plurality of hydraulic pumps that drive the tubing device. A self-propelled all-casing excavator wherein one pressure oil is supplied to left and right hydraulic motors of the traveling body via switching valves provided in parallel with each other. 2. The self-propelled all-casing excavator according to claim 1, further comprising a manual switching valve for switching pressure oil to left and right hydraulic motors on a discharge side of the switching valve for operating the tubing device.