Ground-drilling device

Abstract

To provide a ground-drilling device capable of preventing overload on the device.SOLUTION: A ground-drilling device 10 comprises a device main body 11, a boom 12 connected to the device main body 11, an arm 13 connected to the boom 12, and a drilling body 14 that, being connected to the arm 13, is inserted into a ground G. The device main body 11 has an inclinometer 31 installed to measure the pitch towards the drilling body 14.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ground boring device that can be used as a ground improvement device for strengthening in-situ soil by mixing a solidifying material into the in-situ soil. [Background technology]

[0002] As an example of this type of ground drilling equipment, there exists a rotary blender based on a backhoe as a ground improvement device, and construction has already been carried out. However, although this type of equipment is not thought to pose any major problems in construction, it suffers from severe wear and tear, which leads to increased costs.

[0003] The inventors investigated the cause and found that a large load (overload) was being applied to the equipment during construction, leading to damage to the equipment. Therefore, with reference to Patent Document 1 and other documents, they considered attaching a hydraulic pressure gauge to the hydraulic cylinder that operates the equipment and controlling the hydraulic pressure gauge so that the measured value does not exceed a predetermined value. However, the hydraulic pressure gauge's measured value and the excessive load on the equipment are not always linked, and the accuracy of determining the equipment's overload is low. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-16586 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem to be solved by the present invention is to provide a ground drilling device that can prevent the device from being overloaded. [Means for solving the problem]

[0006] The means for solving the above problems are as follows.

[0007] (Means described in claim 1) A ground drilling device having a device body, a boom connected to the device body, an arm connected to the boom, and a drilling body connected to the arm and inserted into the ground, The device body is equipped with an inclinometer that measures the inclination in the direction toward the drilling body. A ground drilling device characterized by:

[0008] (Means described in claim 2) The device body and the boom, the boom and the arm, and the arm and the drilling body are movably connected by hydraulic cylinders, At least one of the hydraulic cylinders is equipped with a hydraulic pressure gauge. The ground drilling device according to claim 1.

[0009] (Means described in claim 3) The drilling body is provided with hydraulic rotors that rotate in one direction and the other direction, A hydraulic gauge is provided to measure the hydraulic pressure when the rotor blades rotate in one direction and when they rotate in the other direction. The ground drilling device according to claim 1. [Effects of the Invention]

[0010] According to the present invention, a ground drilling device can be provided that can prevent the device from being overloaded. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a ground drilling device according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Next, an embodiment of the present invention will be described. Note that this embodiment is an example of the present invention. The scope of the present invention is not limited to the scope of this embodiment.

[0013] (Application) The present invention can be used in devices that drill holes in the ground, and can also be used in devices that perform construction work involving drilling holes in the ground, such as ground improvement devices. Specifically, the present invention can be used in, for example, ground improvement devices that use backhoes for shallow and medium-layer mixing treatment methods, and attachment drills that use backhoes for drilling holes on slopes. The following description will be given taking the case where the ground drilling device is a ground improvement device as an example.

[0014] (Soil improvement equipment) As shown in Figure 1, the ground improvement device 10 of this embodiment mainly comprises an apparatus main body 11 such as a base machine, a boom 12 connected to the apparatus main body 11, an arm 13 connected to the boom 12, and a boring body 14 such as a blender connected to the arm 13 and inserted into the ground G.

[0015] The device main body 11 is movable on the ground G, and a worker or the like who operates the soil improvement device 10 can ride on it.

[0016] A boom 12 is connected to the device main body 11. The boom 12 has an elongated shape and a known length. The boom 12 is configured to be movable by a boom cylinder 22 so that the direction of extension from the device main body 11 can be changed around the base end.

[0017] An arm 13 is connected to the tip of the boom 12. The arm 13 has an elongated shape and a known length. The arm 13 is configured to be movable by an arm cylinder 23 so that the direction of extension from the boom 12 can be changed around the base end.

[0018] A drilling body 14 is connected to the tip of the arm 13. The drilling body 14 has an elongated shape and a known length. The drilling body 14 is also equipped with a function for drilling holes in the ground G. For example, the drilling body 14 is configured to rotate around its axis while one or more agitating blades 15 on its circumferential surface drill holes in the ground. Of course, the drilling body 14 may be configured to drill holes by rotating around its axis itself, and the agitating blades 15 are not essential. The drilling body 14 is also equipped with flow channels for, for example, solidification material, air, drilling water, etc. (not shown), and the circumferential and tip surfaces of the drilling body 14 are equipped with outlets for the solidification material, air, drilling water, etc. The drilling body 14 is configured to be movable by a drilling body cylinder 24 so that the direction of extension from the arm 13 changes around the base end. By moving this drilling body 14, the drilling body 14 is controlled to face (along) the drilling direction, usually vertically.

[0019] In this embodiment, the boom 12 and the arm 13 are members that connect the device main body 11 and the boring body 14, and function as the arms of the ground improvement device 10. In other words, they are the device arms. Therefore, this device arm does not need to be made up of two members, the boom 12 and the arm 13, but may be made up of one member or three or more members.

[0020] In this embodiment, the device body 11 is equipped with an inclinometer 31 that measures the inclination toward the drilling site, i.e., toward the drilling body 14. In this situation, for example, when the ground is hardened or boulders are present, making drilling difficult, pushing the drilling body 14 into the ground can overload some part of the ground improvement device 10 and simultaneously lift the device body 11. As a result, the measurement value of the inclinometer 31 increases. Therefore, the inclinometer 31 can be provided to prevent overloading of the ground improvement device 10. While the load on the device increases when drilling hard ground, the value of the inclinometer 31 does not increase significantly as long as it is within the design limit. Therefore, this embodiment allows for reliable detection of overload. The measurement value of the inclinometer 31 can be displayed on a monitor, for example, and the device can be configured so that if the value exceeds a threshold, the worker can slow down or stop work, or work cannot be performed above the threshold.

[0021] Additionally, the device arms, particularly in this embodiment the boom 12 and arm 13, and further the drilling body 14, are each provided with inclinometers 32, 33, 34. According to this embodiment, position information for the tip of the drilling body 14 can be obtained using trigonometric functions based on the measurement values ​​of these inclinometers 32 to 34 and the lengths of the boom 12, arm 13, and drilling body 14, and bottom contact can be reliably detected.

[0022] Incidentally, if the pin connecting the device main body 11 and the boom 12 is (A), the pin connecting the boom 12 and the arm 13 is (B), and the pin connecting the arm 13 and the drilling body 14 is (C), it is preferable to install an inclinometer at any of the following positions where the angle from the horizontal plane of the line connecting pins (A) and (B) can be determined, the angle from the horizontal plane of the line connecting pins (B) and (C) can be determined, and the inclination of the drilling body 13 can be determined.

[0023] In this embodiment, the boom cylinder 22, arm cylinder 23, and drilling body cylinder 24 are composed of hydraulic cylinders. At least one of these cylinders 22 to 24 is equipped with a hydraulic gauge. The measured values ​​of this hydraulic gauge provide information on the hardness of the ground, the drilling speed, the drilling resistance, etc. Therefore, even if the measured value of the inclinometer 31 increases, it can be determined whether the increase is due to an overload on the ground improvement device 10 or to a change in the hardness, drilling speed, drilling resistance, etc. of the ground G. As a result, these hydraulic gauges can be expected to play a role in correcting the measured value of the inclinometer 31.

[0024] Furthermore, if the surface layer of the ground G is soft, even if a steel plate is installed, the load change caused by drilling may cause the device body 11 to tilt. If a hydraulic meter is provided, it is possible to distinguish between overload and such tilt.

[0025] As mentioned above, the drilling body 14 in this embodiment is equipped with an agitator blade 15. This agitator blade 15 can rotate in both one direction and the other. Therefore, it is preferable to provide at least two hydraulic gauges: one that measures the hydraulic pressure when the agitator blade 15 rotates in one direction, and another that measures the hydraulic pressure when the agitator blade 15 rotates in the other direction. The presence of these hydraulic gauges makes it possible to know the load on the drilling body 14 due to the hardness of the ground G, etc., but if two or more hydraulic gauges are provided, it becomes possible to correct the inclinometer 31 regardless of which direction the agitator blade 15 rotates.

[0026] Incidentally, if the ground is hard, the agitator blade 15 may not dig in and may continue to rotate as it slides. On the other hand, the agitator blade 15 may dig into the hard ground and stop rotating (slow down). By providing a hydraulic pressure gauge on the agitator blade 15 and using this in conjunction with the pressing pressure that can be measured by the hydraulic pressure gauge on the boom 12 or arm 13, it becomes possible to distinguish between these two situations. [Industrial Applicability]

[0027] The present invention can be used as a ground drilling device such as a ground improvement device. [Explanation of symbols]

[0028] 10...ground improvement device, 11...device body, 12...boom, 13...arm, 14...boring body, 15...mixing blade, 22...boom cylinder, 23...arm cylinder, 24...boring body cylinder, 31, 32, 33, 34...inclinometer, G...ground.

Claims

1. A ground drilling device having a device body, a boom connected to the device body, an arm connected to the boom, and a drilling body connected to the arm and inserted into the ground, The device body is equipped with an inclinometer that measures the inclination in the direction toward the drilling body. A ground drilling device characterized by:

2. The device body and the boom, the boom and the arm, and the arm and the drilling body are movably connected by hydraulic cylinders, At least one of the hydraulic cylinders is equipped with a hydraulic pressure gauge. The ground drilling device according to claim 1.

3. The drilling body is provided with hydraulic rotors that rotate in one direction and the other direction, A hydraulic gauge is provided to measure the hydraulic pressure when the rotor blades rotate in one direction and when they rotate in the other direction. The ground drilling device according to claim 1.

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