JPH07238766A - Excavator - Google Patents

Abstract

PURPOSE:To make it possible to pull out a casing easily. CONSTITUTION:An auger drive device 4 and a casing drive device 5 are suspended with wires 6 and 7 respectively along a leader mast 2 so that they may be lifted freely. An auger screw 10 is connected to the auger drive device while a casing 15 which outwardly fits in the auger screw, is connected to the casing drive device so that each drive device may drive independently. There are provided an upper part chuck device 16, which chucks the outer periphery of the casing attached to the casing drive device and a lower part chuck device 17, which is located below the upper part chuck device and chucks the outer periphery of the casing. Hydraulic cylinders 18 and 19 are interposed between the casing drive device and the lower part chuck device. When the pull-out load of the casing is increased excessively, the casing is chucked with both the upper and lower part chuck device alternately so that the casing 15 may be pulled out by driving the hydraulic cylinders 19 with the chuck side as a reaction receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator, and more particularly to an excavator having an auger screw and a casing.

[0002]

2. Description of the Related Art An excavator as an excavator for making piles, drilling holes, etc. in the ground is provided with an August drill and a casing externally fitted to the August drill, and the ground is excavated by the August drill and a drilling blade at the lower end of the casing. However, there is one in which the earth and sand are discharged through the inside of the casing by the blades of August Krill.

In this type of excavator, an auger drive device and a casing drive device are suspended by separate wires along a guide rail on the side of a leader mast installed upright on a base machine, etc. The wire is wound up and down by a winch mounted on the machine so that the wire can be lowered at the time of excavation and pulled out at the end of excavation.

[0004]

However, in the above-mentioned excavator, when the casing is pulled out, the load applied to the wire may become excessive due to the friction between the casing and the ground. Therefore, it is necessary to increase the pulling force by the wire, but there is a limit to the strength of the leader mast in order to increase the pulling force by the wire, and in order to be able to withstand this, the leader mast and other parts The strength of the excavator must be increased, and as a result, the excavator becomes larger.

In view of this, it is an object of the present invention to provide an excavator which does not depend on a wire for pulling out a casing and can pull out the casing independently even if there is a large frictional resistance.

[0006]

As a means for solving the problems of the above-mentioned prior art, the present invention is capable of lifting and lowering an auger drive unit and a casing drive unit by wires along a leader mast. In the excavator connected to the auger drive device so as to independently drive the auger screw and the casing drive device, respectively, the casing fitted to the auger screw is attached to the casing drive device and fitted to the casing. The casing drive device and the lower chuck are provided with an upper chuck device that chucks the outer periphery thereof, and a lower chuck device that is located below the upper chuck device independently of the upper chuck device and that is externally fitted to the casing and chucks the outer periphery thereof. A hydraulic cylinder is interposed between the device and the casing extraction load Said casing to chuck alternately above and below the chuck device, characterized in that the chuck side so as to pull out the casing by a hydraulic cylinder as a reaction force receiver can.

[0007]

When excavating the ground, the upper chucking device is operated to chuck the casing and the lower chucking device is set to the free state, and the auger driving device and the casing driving device are driven to rotate the augus drill and the casing. Excavate to a predetermined depth.

After the completion of excavation, when pulling out the casing, if it cannot be pulled out only by the lifting force of the wire due to the friction with the ground, the upper chuck device is first operated to chuck the casing, and the lower chuck device is free. When the hydraulic cylinder is extended, the lower chuck device receives the reaction force of the lower chuck device on the ground, the casing drive device ascends together with the casing, and the casing is pulled out.

If the frictional resistance is still large even after the above-mentioned pulling out, the upper chuck device is made free under the above-mentioned pulled-up state, the casing is fixed by the lower chuck device, and then the hydraulic cylinder is shortened to make the casing drive device. To lower. Then, the upper chuck device is operated, the hydraulic cylinder is extended and the casing drive device is pushed up, and with this, the casing is pulled out.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. 1 shows a front view of an embodiment of the present invention, and FIG.
Shows the same side face, and along the guide rail 3 arranged in the longitudinal direction of the front surface of the leader mast 2 erected on the base machine 1 etc., an auger drive device 4 is provided on the upper side and a casing drive device 5 is provided on the lower side. Are individually suspended by wires 6 and 7, and these wires 6 and 7 are guided to a winch (not shown) on the base machine 1 via a sheave (not shown) at the upper end of the leader mast 2, and the winches By hoisting and hoisting, the auger drive device 4 and the casing drive device 5 are respectively moved up and down along the guide rails 3.

The auger drive device 4 has a drive motor 8 and a speed reducer therein, and an output shaft 9 of the speed reducer has an upper end of an auger screw 10 connected to the drive motor 8.
Is driven to rotate the Auger Cruille 10.

The casing drive device 5 has drive motors 11 and 11 (FIG. 3) and a speed reducer on both sides. Inside the casing drive device 5, the casing 15 is provided in the central region so that the casing 15 can penetrate vertically. There is no member that hinders the insertion of the.

An upper chuck device 16 which is fitted on the casing 15 and holds the outer circumference of the casing drive device 5 is provided below the casing drive device 5 so as to move up and down together with the casing drive device 5. A lower chuck device 17 that is externally fitted to the casing 15 and holds the outer periphery of the casing 15 is provided below the position 16 independently.

Left and right hydraulic cylinders 19, 19 are interposed between the flange portions 18, 18 protruding left and right of the casing drive device 5 and the upper surface of the lower chuck device 17. In the case of a model in which only the casing 15 is pulled out, the upper ends of the piston rods of the hydraulic cylinders 19, 19 and the collar portions 18, 18 of the casing drive device 5 do not have to be connected, but have a structure for abutting. It In the case of a model in which the casing 15 is also pushed in, the hydraulic cylinders 19 and 19 are fixed to the casing drive device 5, the tip of the piston rod is connected to the casing drive device 5, and the lower chuck device 17 can be moved up and down. To be done.

The details of the casing drive unit and the upper chuck unit 16 attached to the casing drive unit are shown in FIG.
3, the apparatus main body 20 suspended by the wires 7 and 7 has a frame shape, and the sheaves 21 and 21 on which the wires 7 and 7 are hung are axially attached to the upper portion thereof. There is. The left and right drive motors 11 and 11 are vertically mounted on both sides of the inside of the apparatus main body 20 at positions deviated to one side with respect to the horizontal center line (in FIG. 3, the drive motors 11 are drawn on the center line for convenience sake). The gears 12, 12 on the output shafts 11a, 11a of the drive motors 11, 11 mesh with the teeth 13 on the outer periphery of the ring-shaped swivel member 14 to be rotated. . The swivel member 14 is rotatable by a swivel bearing 22, and the upper chuck device 16 is supported by the swivel member 14 via a joint member 23 connected by a fixing portion 23a. And the upper chuck device 16 is configured to rotate.

The upper chuck device 16 is provided with a pair of left and right arcuate chuck members 25, 25 pivotally supported by shafts 26, 26 in one half of a ring-shaped device body 24. The open / close cylinder 27 is connected between the free ends of the two 25, 25. By shortening the open / close cylinder 27, the left and right chuck members 2 are connected.
The free ends of the chuck members 2 and 5 are attracted to each other, and the chuck member 2 is attached to the outer periphery of the casing 15 that passes through the inside of the ring-shaped device body 24.
The inner side surfaces of the casings 5 and 25 are pressed against each other, and the casing 15 is chucked immovably at three points, namely, the inner peripheral surface of the apparatus body 24 and the inner side surfaces of the left and right chuck members 25 and 25.

As shown in a plan view of FIG. 5 and a front view of FIG. 6, the lower chuck device 17 is provided with a hole 29 through which the casing 15 passes at a central position of a device body 28 having a rectangular plate shape. A pair of left and right arcuate chuck members 30 and 30 are provided at their halves in the circumferential direction of the hole 29 at their base ends with shafts 31 and 3.
These chuck members 3 are pivotally supported by
The free ends of 0 and 30 are connected by an open / close cylinder 32. By shortening the open / close cylinder 32, the free ends of the left and right chuck members 30 and 30 are pulled,
Inner side surfaces of the chuck members 30, 30 are pressed against the outer periphery of the casing 15 passing through the hole 29, and the casing 15 is immovable at three points of the inner peripheral surface of the hole 29 and the inner side surfaces of the left and right chuck members 30, 30. It is configured to chuck.

In the embodiment of FIGS. 1 and 2, as shown in FIG. 6, the bases of the hydraulic cylinders 19, 19 are fixed to the left and right upper surfaces of the main body 28 of the apparatus, and the piston rods 19a, 19
There are contact plates 33, 33 at the upper end of 9a so as to come into contact with the lower surfaces of the collar portions 18, 18 of the device body 20 of the casing drive device 5.

Next, the operation of the above embodiment will be described.

Before the start of excavation, as shown in FIGS. 1 and 2, the auger drive unit 4 and the casing drive unit 5 are pulled up to the position above the leader mast 2, and the output shaft 9 of the auger drive unit 4 is connected to the auger drive unit 4. The auger screw 10 is hung so that the casing 15 is connected to the casing drive device 5.

After this, the opening / closing cylinder 27 of the upper chuck device 16 is shortened, the casing 15 is chucked by the chuck members 25 and 25, the drive motors 8 and 11 of the auger drive device 4 and the casing drive device 5 are driven, and the auger screw 10 and the casing 15 are rotated, and the ground is excavated by the excavating blade 10a at the lower end of the August screw 10 to advance while excavating the soil, and the casing 15 is pushed into the excavated hole.

FIG. 7 (A) shows the front view at the time when the excavation is completed. From this state, the casing 15 and the August drill 10 are pulled out, but only the lifting force of the wire 7 due to the casing 15 friction with the ground. If it is not possible to pull it out, first, the upper chuck device 1
6 is operated (the opening / closing cylinder 27 is shortened), and the casing 15 is chucked by the chuck members 25, 25.
If the lower chuck device 17 remains free and the hydraulic cylinders 19, 19 are extended, the lower chuck device 1
Since the device body 28 of No. 7 is on the ground, it receives the reaction force thereof, the casing drive device 5 moves up together with the casing 15, and the casing 15 is pulled up.

If the frictional resistance is still high even after the pulling up, the lower chuck device 17 is operated in the pulling up state to fix it to the casing 15,
After preventing the casing 15 from settling, the upper chuck device 16 is made free (the opening / closing cylinder 27 is extended),
The hydraulic cylinders 19, 19 are shortened to lower the casing drive device 5, and the upper chuck device 16 is lowered at the lower limit.
Is actuated again to chuck the casing 15, and the lower chuck device 17 is set free, and then the hydraulic cylinder 19,
The casing drive device 5 is pushed up by extending 19 to pull out the casing 15. FIG. 7 (B)
Shows a state in which the casing 15 is pulled out by performing the pulling action several times. At this time, the auger drive device 4 is also pulled up by the wire 6 so as not to hinder the pulling-out of the casing 15.

In the above embodiment, since the model is intended only for pulling out the casing 15, the upper ends of the piston rods 19a, 19a of the hydraulic cylinders 19, 19 are separated from the casing drive unit 5. In the case of a model having a press-fitting function when the insertion resistance is great when the casing 15 is dug, the upper ends of the piston rods 19a, 19a of the hydraulic cylinders 19, 19 and the collar portion 18 of the device body 20 of the casing drive device 5, It can be achieved by connecting with 18.

By doing so, when the casing 15 is press-fitted, the device main body 28 of the lower chuck device 17 is fixed to the load by the counterweight or the ground side by an appropriate means, and the lower chuck device 17 remains free to operate the hydraulic cylinder. By extending 19 and 19 and raising the casing drive device 5, the upper chuck device 16 is operated to fix the casing drive device 5 to the casing 15, and then the hydraulic cylinders 19 and 19 are shortened.
The casing 15 can be press-fitted into the ground via the upper chuck device 16 by pulling down. By repeating the above operation, the casing 15 can be press-fitted to a predetermined depth.

FIG. 8 shows another modified example, in which the hydraulic cylinders 19 and 19 are the main body 20 of the casing drive device 5.
The piston rods 19a, 19a are attached to the outer surfaces of the left and right side portions of the above so as to face downward, which is a difference from the above embodiment.

Also in this modification, in order to pull out the casing 15, the casing driving device 5 is lowered with the hydraulic cylinders 19 and 19 shortened, and the upper chuck device 16 is operated to fix the casing 15 to the casing 15. Subsequently, the casing 15 can be pulled out by extending the hydraulic cylinders 19, 19.

Further, in the case of a model in which the casing 15 can be press-fitted, the hydraulic cylinder 1 is used as in the above embodiment.
By connecting the piston rods 19a and 19a of 9 and 19 and the lower chuck device 17, the casing 15 can be press-fitted in the same manner as in the above embodiment.

The upper and lower chuck devices 16,
The structure of 17 may be replaced with not only a chuck member but also a fastening member such as a wedge.

[0030]

As described above, according to the present invention, in an ordinary excavator having an August drill and a casing, the upper chuck device and the lower chuck device do not depend on the lifting force of the wire when the casing is pulled out. Since it can be pulled out by the force of the hydraulic cylinder by alternately operating and, the load applied to the wire is significantly reduced, and it is not necessary to increase the strength of each part of the excavator including the leader mast, There is an effect that it is possible to avoid an increase in size and that excavation work can be easily performed even in the case of soil ground having a large friction resistance.

Since the function of press-fitting the casing can be provided without changing the structure, there is an advantage that the range of use can be expanded.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view of the same.

3 is a front view of the casing drive device in FIG. 1. FIG.

FIG. 4 is a view on arrow A in FIG.

5 is a plan view of the lower chuck device in FIG. 1. FIG.

FIG. 6 is a front view of the same.

7A and 7B are explanatory views of the operation, FIG. 7A shows a state at the end of excavation, and FIG. 7B is a front view showing a casing drawing process.

FIG. 8 is a front view showing another modification.

[Explanation of symbols]

 1 base machine 2 leader mast 4 auger drive device 5 casing drive device 6, 7 wire 8, 11 drive motor 10 auguscriille 14 rotating member 15 casing 16 upper chuck device 17 lower chuck device 18 collar part 19 hydraulic cylinder 20, 24, 28 device Main body 25,30 Chuck member 27,32 Open / close cylinder

Claims (3)

[Claims] 1. A casing in which an auger drive device and a casing drive device are respectively suspended along wires along a leader mast so as to be vertically movable, and an auger drive device and an auger screw device are externally fitted to the auger drive device. In an excavator connected to drive each independently, an upper chuck device attached to the casing driving device and externally fitted to the casing to chuck the outer periphery thereof, and a lower chuck device independent of the upper chuck device. And a lower chuck device that is externally fitted to the casing and chucks the outer periphery of the casing, and a hydraulic cylinder is interposed between the casing drive device and the lower chuck device. The upper and lower chuck devices alternately chuck the casing,
An excavator characterized in that a casing is pulled out by a hydraulic cylinder using a chuck side as a reaction force receiving member. 2. A base portion of the hydraulic cylinder is fixedly erected on an apparatus main body of the lower chuck device, and a tip of a piston rod thereof is brought into contact with or connected to a lower surface of a flange portion of the apparatus main body of the casing drive device. The excavator according to claim 1. 3. The hydraulic cylinder is attached to a side portion of an apparatus main body of the casing drive device with its piston rod facing downward, and the tip of the piston rod is brought into contact with or connected to the apparatus main body of the lower chuck device. The excavator according to claim 1.