JPH0352263Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an excavation device used for turning piles, etc. in construction work.

[Conventional technology]

Various technologies have already been proposed for cutting into the ground into a core shape using a steel pipe casing. There are devices that use screws to excavate the earth and sand inside the casing.

When using a casing for drilling in this way, it is possible to drill more efficiently by applying vibration instead of simply rotating it, but rotation applies a horizontal force, while vibration applies a vertical force. Therefore, it would be extremely unsuitable to proceed at the same time. Further, in the earth auger, as a matter of course, the main excavation means is limited to a screw, and there is a lack of variety.

On the other hand, Japanese Patent Application Laid-open No. 151604/1983 discloses a technique for efficiently excavating the ground by applying rotation and vibration to a steel pipe casing during drilling.

That is, in this Japanese Patent Application Laid-open No. 51-151604, a rotary pipe having a drilling head at its tip is connected to a striking means, and the striking means shocks the rotary pipe forward in the axial direction.

[The problem that the idea attempts to solve]

However, the excavation equipment disclosed in Japanese Patent Application Laid-Open No. 51-151604 has a heavy casing rotating device (such as a special motor 18 and a pinion 19 provided on the frame 16).
, chuck 12, etc.) are also subjected to vibrations from the striking means together with the casing.

As a result, the motor must be made sufficiently strong to withstand vibrations and must be expensive.

Furthermore, in order to vibrate the rotating device of the casing, which is a heavy object, a vibration force greater than necessary is required, and a large-sized impact means (vibration device) must be used.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
In order to achieve efficient cutting into the ground by applying not only rotation but also vibration to the steel pipe casing without a complicated mechanism, the vibration applied to the steel pipe casing can be used to drive the rotation of the steel pipe casing. The purpose is to provide a drilling equipment that prevents information from being transmitted to the equipment as much as possible.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, the present invention installs a holder upright from the base of a drive device in which a hollow rotating shaft is connected to a motor via a reducer, and attaches a sheave to the tip of the holder to suspend the whole thing, making it possible to excavate. A steel pipe casing is inserted into a hollow rotating shaft, its outer periphery is connected so as to be slidable in the vertical direction, a through-hollow part is formed, and the vibration excitation device is connected to the steel pipe casing by making the hollow part communicate with the upper end opening of the casing. The gist is that the vibration generating device is attached to the upper end and suspended from the holder with a buffer such as a spring interposed therebetween.

[Effect]

According to the present invention, the vibration excitation device is attached to the upper end of the steel pipe casing, and the vibration excitation device is suspended from a holder erected from the base of the drive device with a buffer such as a spring interposed. The vibration of the oscillating device is alleviated by the shock absorber, and almost no vibration is transmitted to the drive device.

[Example of idea]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially cutaway front view showing an embodiment of the drilling equipment of the present invention, in which 1 indicates a steel pipe casing with a drilling blade 2 integrally formed or implanted at the tip, and 3 This is a drive device for rotating this steel pipe casing 1. The drive device 3 has motors 5 and 5' attached to a flat base 4, and a built-in reducer connected to the motors.Furthermore, a hollow rotating shaft 6 provided at the center is connected to the motor 5 through the reducer. ，
It is connected to 5'.

Furthermore, the drive device 3 has a holder 7 erected from the base 4, a sheave 8 attached to the tip thereof, and the whole is suspended by a wire 9 from a top sheave of a leader provided in a movable vehicle so as to be movable up and down. I tried to lower it.

The upper part of the steel pipe casing 1 is inserted into the hollow rotating shaft 6, and a protrusion 11 with a roller 10 attached to the tip protrudes from the lower end of the rotating shaft 6. A spline 12 is provided protrudingly to connect the roller 10 to the casing 1.
The protrusion 11 and the spline 12 are engaged with each other to connect the casing 1 and the hollow rotating shaft 6 so as to be slidable in the vertical direction. In addition,
As another embodiment, a spline may also be provided protruding from the rotating shaft 6 side, and this spline may be engaged with the spline 12 on the casing 1 side.

In addition, a shock absorber 13 such as a spring is connected to the holder 7.
As shown in FIG. 2, the vibration generating device 14 is suspended with a vibration generating device 14, which is equipped with a double-shaft motor 15 that serves as a vibration drive source and has a through hole in the center having approximately the same diameter as the steel pipe casing 1. A hollow portion 16 is formed, and the upper end of the steel pipe casing 1 is rotatably attached to the lower end of the vibration excitation device 14 via a bearing 38. At this time, the upper end opening 1 of the casing 1 is
A and the through-hole hollow part 16 are communicated with each other, so that an excavating means such as a bucket can be inserted into the casing 1 from above as described later. In the figure, reference numeral 17 indicates a swivel device which is placed between the vibration device 14 and the casing 1 and is used to cause water, cement milk, air, etc. to flow into the casing 1.

Next, the usage and operation will be explained. When the motors 5 and 5' are started, the hollow rotating shaft 6 rotates.
Along with this, the steel pipe casing 1 also rotates, and when the motor 15 of the vibration excitation device 14 is activated, vibration is applied to the steel pipe casing 1 at the same time, and the casing 1 is efficiently cut into the ground by both rotation and vibration. It's getting worse. Note that the rotation by the hollow rotating shaft 6 is not limited to rotation in only one direction, but may also be performed by swinging from side to side.Since the hollow rotating shaft 6 and the casing 1 are connected so as to be slidable in the vertical direction, vibrations are not caused by the rotation. It won't be a hindrance.

In this way, the steel pipe casing 1 is inserted into the ground as shown in FIGS. 4 and 5.
Since a space is secured above the casing 1, an excavating means is inserted through the penetrating hollow part 16 while being suspended separately, and the inside of the casing 1 is excavated and discharged. Such excavation means include a hammer grab excavator, a clam shell bucket, an auger drilling bucket, and various other methods, which can be selected as appropriate depending on the ground condition.
It is efficient to use a bucket excavator 20 with a screw conveyor as shown in the figure.

The excavator 20 has a cylindrical bucket 24 fixed concentrically to the tip of a ram 23 of a hydraulic cylinder 22 whose one end is fixed to a cylindrical holder 21.
4 has a bifurcated conical cap 2 on the lower end surface of the opening.
5 and 25 are hinged so that they can be opened and closed,
A screw conveyor 27 rotated by a hydraulic motor 26 is positioned concentrically within the bucket, and with the caps 25, 25 open to the positions shown by the chain lines, the bucket 24 is lowered by the drive of the hydraulic cylinder 22, and the cap 25 is lowered by the drive of the hydraulic cylinder 22. , 25 into the ground along the inner surface of the casing, and the soil is carried into the bucket 24 by the screw conveyor 27. When it is full, the caps 25, 25 are closed and the soil is lifted out of the casing 1 to be discharged again. It is used for excavation. 28 is a hydraulic cylinder for opening and closing the cap, 29 is a connecting rod, and 30 is a locking piece that is slidably supported so that it can move forward and backward from the outer circumferential surface of the holder 21. This is brought into contact with and separated from the inner surface of the casing 1 to close the holder 21 to the casing. A cam that engages and disengages the cam. 31 is a cam that moves the locking piece 30 forward and backward, and 32 is a hydraulic cylinder that moves the cam 31.

Next, as shown in FIG. 7, a reinforcing bar cage 37 is inserted into the vertical hole 36 from the upper end of the casing 1, and then concrete is poured into the casing 1 via the swivel device 17 or by using a separate tremie pipe. Next, while the poured concrete has not hardened, the eighth
Pull out the casing 1 upward while rotating and vibrating it as shown in the figure. When the concrete hardens in this way, large diameter reinforced concrete piles are created in the ground.

[Effect of idea]

As described above, the excavator of the present invention not only rotates the steel pipe casing, but also vibrates it at the same time to cut into the ground, so it can be inserted very efficiently.

Furthermore, since a large opening is secured above the casing, various excavating means can be inserted into the casing, allowing for a wide variety of uses.

In addition, the vibration generator is attached to the upper end of the steel pipe casing, and this vibration generator is suspended from a holder that stands up from the base of the drive device with a buffer such as a spring interposed. The vibrations of the vibrating device are reduced and hardly transmitted to the drive device, and as a result, there is no need to make the motor strong enough to withstand vibrations, and no more excitation force than necessary is required, so the vibrations are reduced. The device also needs to be small.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing an embodiment of the excavation rig of the present invention, Fig. 2 is a plan view of the exciter section, and Fig. 3 is an example of the excavation rig used in combination with the excavation rig of the present invention. 4 to 8 are longitudinal sectional front views showing each process when the apparatus of the present invention and the apparatus shown in FIG. 3 are used. 1... Steel pipe casing, 1a... Open end, 2...
...Drilling blade, 3... Drive device, 4... Base, 5,
5'... Motor, 6... Hollow rotating shaft, 7... Holder, 8... Sheave, 9... Wire, 10...
...Roller, 11...Protrusion, 12...Spline,
13...Buffer body, 14...Exciter, 15...Double shaft motor, 16...Through hollow part, 17...Swivel device, 20...Bucket excavator with screw conveyor, 21...Cylindrical holder , 22...Hydraulic cylinder, 23...Ram, 24...Cylindrical bucket, 25...Cap, 26...Hydraulic motor,
27... Screw conveyor, 28... Hydraulic cylinder for opening and closing the cap, 29... Connection rod, 30
... Locking piece, 31 ... Cam, 32 ... Hydraulic cylinder, 36 ... Large-diameter vertical hole, 37 ... Rebar cage, 3
8...Bearing.

Claims (1)

[Scope of utility model registration request] A holder is installed upright from the base of the drive device, which connects a hollow rotating shaft to the motor via a reducer, and a sheave is attached to the tip of the holder to suspend the entire device.
An excitable steel pipe casing is inserted into a hollow rotating shaft, its outer periphery is connected so as to be slidable in the vertical direction, a through-hollow part is formed, and the vibration excitation device is connected to the steel pipe by making the hollow part communicate with the upper end opening of the casing. 1. An excavation device characterized in that the vibration excitation device is attached to the upper end of a casing and suspended from the holder with a buffer such as a spring interposed therebetween.