JPH093890A - Earth anchor device - Google Patents

Abstract

PURPOSE: To insert a screw pipe deeply into a stratum having a bearing capacity by inserting a connection pipe, the top end of which is connected to an oil- hydraulic cylinder through a rotation motor, into a screw pipe provided with a helical vane around the pipe so as to be slidable and non-rotatable. CONSTITUTION: An earth anchor device is disposed in a casing set on a base frame of a pipe driving machine or the like. And when the pile driving machine is fixed on the ground, an oil-hydraulic cylinder 15 is extended by a rotation motor 17 to rotate and lower a screw pipe l received in a connection pipe 4 so that the pipe 1 is screwed into the ground by means of a helical vane 2 and helical drill bit 3. And in the case that even if the entire length of the pipe 1 is inserted into the ground, sufficient bearing capacity can not be obtained, a connection pin 11' is released to contract the cylinder 15 thereby to lift the pipe 4. And if a stopper protruded from the inner periphery at the top end of the pipe 1 and a stopper provided on the outer periphery at the bottom end of the pipe 4 are engaged with each other, the pipe 1 and the pipe 4 are connected by the connection pin. Further the cylinder 15 is extended by the motor 17 to screw the pipe 1 into the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground anchor device for supporting and fixing a construction machine such as a pile driver, a crane vehicle, or a load testing device, which is movable by crawlers, to the ground.

[0002]

2. Description of the Related Art Conventionally, in a construction machine or the like that moves by a crawler, a screw anchor having spiral blades attached to the outer periphery of a rod is screwed into the ground and supported and fixed to the ground in order to prevent it from falling during work.

[0003]

In the above-mentioned conventional screw anchor, since one screw rod is simply screwed into the ground and installed, the ground is such that the ground is soft ground up to the penetration depth of the screw rod. Depending on the situation, the anchor may not reach the formation where sufficient bearing capacity is obtained, and there is a risk that a reliable anchor effect cannot be expected.

Therefore, it is conceivable to lengthen the screw rod according to the depth of the formation where the supporting force can be obtained.
If the screw rod is made too long, there are problems in that the height of the construction machine during traveling is limited and the traveling stability is difficult, and the operation of the installed machine is hindered.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a screw tube around which spiral blades are provided, and a slidable and non-rotatable inside of the screw tube 1. The connecting pipe 4 which is inserted and whose upper end is connected to the hydraulic cylinder 15 via the rotary motor 17.
The present invention proposes an earth anchor device which comprises a screw pipe 1 and a connecting means for connecting the screw pipe 1 and the connecting pipe 4 in a contracted state and a stretched state so that they cannot slide.

[0006]

When a sufficient supporting force cannot be obtained even if only the screw pipe 1 penetrates into the ground, the connecting pipe 4 is pulled up and the lower end of the connecting pipe 4 is connected and integrated with the upper end of the screw pipe 1 by a connecting means. In this state, the screw tube 1 can be screwed and penetrated into the formation having a deeper supporting force.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a screw pipe 1 is provided with a spiral blade 2 around the screw pipe 1 and a drill bit 3 is attached to the tip thereof, and a connecting pipe 4 is slidable and non-rotatable therein. 2 is inserted into the screw pipe 1 and is pulled up from the inside of the screw pipe 1 as shown in FIG. Is configured so that it can be extended as a united body.

As shown in FIG. 5, the sliding contact surface between the screw pipe 1 and the connecting pipe 4 is provided with a groove 5 for preventing rotation and a protrusion 6 which are slidably fitted to each other in the axial direction. There is.

The inner circumference of the upper end of the screw pipe 1 and the connecting pipe 4
Stoppers 7 and 8 that engage with each other are projectingly provided on the outer periphery of the lower end of the screw pipe 1, and when the connecting pipe 4 is pulled out from the inside of the screw pipe 1, the stopper is locked at the upper end of the screw pipe 1 and the lower end of the connecting pipe 4. In this locked state, the connecting pin 11 is passed through the through hole 9 provided around the upper end portion of the screw pipe 1 and the through hole 10 provided in the connecting pipe 4 so as to face the through hole 9 by means of a coupling means. It is designed to be integrated so that it cannot slide.

Further, the connecting pipe 4 and the through hole 9 provided around the upper end portion of the screw pipe 1 are opposed to the through hole 9 so that the connecting pipe 4 and the screw pipe 1 do not slide relative to each other when the connecting pipe 4 is housed in the screw pipe 1. By connecting means such as passing the connecting pin 11 'through the through hole 10' provided in 4, the both are slidably connected and integrated.

As another means of this connecting means, there may be used a means in which a bolt screwed from the outer circumference of the screw pipe 1 is pressed against the outer circumference of the connecting pipe 4 or is screwed to be integrated with each other.

As shown in FIG. 6, the earth anchor composed of the screw pipe 1 and the connecting pipe 4 constructed as described above is housed in a casing 14 vertically installed on a base frame 13 of a construction machine 12, and the casing is A rotary motor 17 at the tip of a telescopic rod 16 of a hydraulic cylinder 15 connected to the upper end of 14 connects the upper end of the connecting pipe 4 and hangs down.

In the construction described above, when the construction machine 12 is fixed by the ground anchor, the hydraulic cylinder 15 is extended while the rotary motor 17 is driven and the connecting pipe 4 is contracted and housed (FIG. 7). Rotate 1 down,
The spiral blade 2 is screwed into the ground one by one.

When the screw tube 1 is fully lowered and its full length penetrates into the ground as shown in FIGS. 2 and 8, if sufficient supporting force is not obtained, the connecting pin 11 'or the like is connected. The hydraulic cylinder 15 is contracted by releasing the means, the connecting pipe 4 is pulled up as shown in FIGS. 3 and 9, the stoppers 7 and 8 are engaged, and the lower end of the connecting pipe 4 is engaged with the upper end of the screw pipe 1. In the stopped state, the screw tube 1
The connecting pipe 4 and the connecting pipe 4 are connected and integrated by a connecting means such as a connecting pin 11, and in this state, the hydraulic cylinder 15 is extended to drive the screw pipe 1 while driving the rotary motor 17 again as shown in FIGS. A deeper bearing layer is screwed into the formation.

On the other hand, when pulling up the ground anchor thus installed, the screw tube 1 is pulled up while rotating backward until the upper end of the screw anchor 1 reaches the surface of the earth by performing the reverse operation to the above. After releasing the coupling means,
The hydraulic cylinder 15 is extended to house the connecting pipe 4 in the screw pipe 1, and the two are connected and integrated by a connecting means. In this state, the hydraulic cylinder 15 is contracted and operated to contract the casing 14.
The screw tube 1 is pulled up together with the connecting tube 4.

By connecting a plurality of connecting pipes 4 in the same manner as the connecting relation between the screw pipes 1 and the connecting pipes 4, the lengths of the screw pipes 1 and the connecting pipes 4 are made relatively short and a deeper supporting force is obtained. Can penetrate a stratum.

[0017]

As described above, according to the present invention, when sufficient support force cannot be obtained even if only the screw pipe penetrates into the ground, the connecting pipe is pulled up and the lower end of the connecting pipe is attached to the upper end of the screw pipe. The screw tube can be screwed and penetrated into the formation having a deeper supporting force in this state by connecting and integrating by the connecting means.

Therefore, it is possible to screw into a deeper formation without penetrating the length of the screw tube itself.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a contracted state of a screw pipe and a connecting pipe of the present invention.

FIG. 2 is a vertical cross-sectional front view showing a state in which the connecting pipe of the present invention is pulled up.

FIG. 3 is a vertical cross-sectional front view showing a combined state of the screw pipe of the present invention and the pulled-up connecting pipe.

FIG. 4 is a vertical cross-sectional front view showing a state where a screw pipe is further penetrated into the ground by the stretched connecting pipe of the present invention.

FIG. 5 is a cross-sectional plan view of the screw pipe and the connecting pipe according to the present invention in a contracted state.

FIG. 6 is a side view showing an installed state of the ground anchor of the present invention.

FIG. 7 is a vertical cross-sectional front view showing a state before penetration of the ground anchor device of the present invention.

FIG. 8 is a vertical cross-sectional front view showing one aspect of the process of installing the ground anchor of the present invention.

FIG. 9 is a vertical cross-sectional front view showing another aspect of installation of the earth anchor of the present invention.

FIG. 10 is a vertical sectional front view showing a completed installation state of the ground anchor of the present invention.

[Explanation of symbols]

 1 Screw Pipe 2 Spiral Blade 3 Drilling Bit 4 Connecting Pipe 5 Groove 6 Protrusion 7 Stopper 8 Stopper 9 Through Hole 10 Through Hole 10 'Through Hole 11 Connecting Pin 11' Connecting Pin 12 Construction Machinery 13 Base Frame 14 Casing 15 Hydraulic Cylinder 16 Telescopic Rod 17 rotation motor

Claims (1)

[Claims] 1. A screw tube around which spiral blades are provided, and a screw tube which is slidably and non-rotatably fitted in the screw tube and whose upper end is connected to a hydraulic cylinder via a rotary motor. An earth anchor device comprising: a pipe; and a coupling means for slidably coupling the screw pipe and the connecting pipe in a contracted state and a stretched state.