JP2860633B2 - Drilling rig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device, and more particularly to a drilling device using a drilling rod having an enlarged head at the tip.

[0002]

2. Description of the Related Art Conventionally, a drilling rod such as an auger screw is inserted into a hollow pile to be built, and a pile is press-fitted while excavating the ground at the tip of the drilling rod with an enlarged head at the tip of the drilling rod. A so-called middle digging method is known in which an enlarged head is enlarged at the time of reaching to form an enlarged bulb at the lower end of a pile. Conventionally, as an example of a drilling rod with an enlarged head used in this kind of construction method, for example, Japanese Patent Publication No. Sho 56
A technique described in Japanese Patent No. 44996/44 has been proposed.

[0003]

However, in the apparatus described in Japanese Patent Publication No. Sho 56-44996, a mechanism for controlling the expanding blade to each of the expanding positions enters the ground, so that the mechanism of the expanding head is required. The control operation was not reliable, and it was also difficult to confirm whether the magnifying head operated reliably. The present invention has been made in view of the above conventional circumstances, and accordingly, an object of the present invention is to solve the above-described problems inherent in the conventional technology, and to always provide a mechanism for controlling the expanding blade to each of the expanding positions on the ground. An object of the present invention is to provide a novel excavator that can ensure control operation of an enlarged head and minimize wear and breakage of related members.

[0004]

In order to achieve the above object, the present invention provides: (1) a plurality of rods arranged in parallel with each other, a screw being provided around the rod, and being rotatable and vertically movable; And a plurality of enlarged blades rotatably supported by a horizontal shaft provided below the enlarged head drive rod and connected to the plurality of rods, respectively. An enlarged head, a rotary drive means for rotatingly driving the enlarged head drive rod, and a hydraulic cylinder connected to each of the plurality of rods, and a vertical direction for driving the enlarged head drive rod in an up and down direction. Driving means, rod position detecting means for detecting a vertical movement position of the magnifying head driving rod, and the magnifying head in accordance with information outputted by the rod position detecting means. . The first expanded diameter that is the same as the inner diameter of the hollow pile to be built (2). The second expanded diameter that is the same as the outer diameter of the hollow pile to be built (3). Control means for setting and controlling the diameter of the bulb to be created to be the same as the outer diameter of the third expanded diameter, wherein the driving rod and the expanding head are arranged underground during operation, An excavator in which the vertical driving means, the rod position detecting means and the control means are always arranged on the ground; (2) the rod position detecting means comprises the expanding head driving rod and / or the vertical moving drive Connected to the means,
The excavator according to item (1), further comprising: a displacing portion that displaces together with the enlarged head driving rod and the piston rod in the vertical driving device; and a fixing portion. (3) The fixing portion is A displacement sensor configured to detect a first position corresponding to the first enlarged diameter of the enlarged head, and a second position corresponding to the second enlarged diameter of the enlarged head; A second proximity sensor, a third proximity sensor for detecting a third position corresponding to the third enlarged diameter, and a corresponding one of the first, second and third proximity sensors. The excavator according to item (2), further comprising first, second, and third light-emitting display elements that display light, and (4) the control unit supplies oil to the hydraulic cylinder. And a pump for generating hydraulic pressure, (1) or (3), further comprising a switching valve for switching and controlling the flow of oil in the oil tank by operating a steering wheel based on the lighting state of the second and third lighting display elements. A drilling device according to any one of the preceding claims.

[0005]

Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a main part showing an embodiment of the present invention, FIG.
3A to 3C are schematic diagrams for explaining the operation of the magnifying head. Referring to FIGS. 1 to 3, an enlarged head driving rod 1 includes first and second rods arranged substantially in parallel.
Rods 11 and 12, and these rods 11, 1
A screw 2 is provided around 2. A horizontal shaft 3 is provided below the enlarged head driving rod 1 (on the right side in FIG. 1), and a first enlarged blade 41 and a second enlarged blade constituting the enlarged head 4 are provided on the horizontal shaft 3. 42 is rotatably supported. The first rod 11 is connected to a first expanding blade, and the second rod 12 is connected to a second expanding blade 42.

A rod position detector 5 is connected to the upper part (left side in FIG. 1) of the enlarged head driving rod 1. The rod position detector 5 includes a displacement part 51 connected to the first and second rods 11 and 12, and the first and second rods 1.
The periphery of 1 and 12 is not connected to the rods 11 and 12, but is constituted by a fixing portion 52 fixed independently. Reference numeral 6 denotes a rotation driving unit that drives the enlarged head driving rod 1 to rotate. The rod position detector 5 is coupled with a vertical movement driving unit 7 that drives the enlarged head driving rod 1 and the rod position detector 5 in the vertical direction. The vertical drive unit 7 includes a first hydraulic cylinder 71 and a second hydraulic cylinder 72, and the first and second piston rods 73, 74 of these hydraulic cylinders 71, 72 are connected to a rod position detector 5.
It is connected to the.

As shown in FIG. 2, the displacement portion 51 of the rod position detector 5 is provided with a detection body 511 which moves up and down at the same time as the displacement portion 51 moves up and down by the action of the up and down movement driving section 7. I have. The fixed portion 52 of the rod position detector 5 has a first position detecting portion 511 for detecting the position of the detection body 511 of the displacement portion 51.
The second and third proximity sensors S1, S2, S3 are provided, and the display provided corresponding to the sensors S1, S2, S3 which are turned on by the operation of these proximity sensors S1 to S3, respectively. A display plate 521 on which elements P1, P2, and P3 are arranged is provided. The display plate 521 is also provided with a power lamp P. The position states detected by the proximity sensors S1, S2, and S3 correspond to a first enlarged diameter, a second enlarged diameter, and a third enlarged diameter of the enlarged head 4 described later.

[0008] As shown in FIG.
A tank 81 containing oil for operating the hydraulic cylinders 71 and 72, a hydraulic pump 82, and a pump 82
A switching valve 83 for flowing and stopping the oil supplied from the controller and switching control, a handle 84 for operating the switching valve 83, and a hydraulic hose 85 from the switching valve 83 to the hydraulic cylinders 71 and 72 are provided.

Referring now to FIG. 3, the state of the expanding diameter of the expanding head 4 of the excavator according to the present invention is as follows: (a) a first expanding diameter (minimum diameter reduction); The expanded diameter (same as the outer diameter of the hollow pile) and the third expanded diameter (same as the bulb diameter) of (c)
One of the major features is that the excavation operation is performed with the enlarged head 4 selectively fixed to any one of the three modes as necessary.

Next, the operation of the present invention will be described. Holes are drilled up to the intermediate layer at the first expanded diameter shown in FIG. 3A, which is the same as the inner diameter of the hollow pile. At that time, the operator operates the control unit 8
By operating the handle 84, the hydraulic cylinders 71 and 72 are stopped at a position where the detection body 511 of the displacement portion 51 is detected by the proximity sensor S1 of the fixed portion 52. At that time, the display element P
1 is turned on, the operator can turn on the lit display element P
Control can be performed while visually observing the state of 1.

When the intermediate layer is laid, the hole is drilled with the second expanded diameter (FIG. 3B) which is the same as the outer diameter of the hollow pile. In this case, the operator operates the handle 84 to operate the display element P.
2 is lit, and the hydraulic cylinder 7 in that state is checked.
The positions of 1, 72 are fixed. Fig. 3 shows the silt layer
A hole is drilled with the same first enlarged diameter as the inner diameter of the hollow pile shown in (a). That is, in this case, when the display element P1 of the display panel 521 is turned on, the operator stops operating the steering wheel to keep the display element P1 turned on, and moves the enlarged head to the position shown in FIG.
The state shown in FIG.

Next, when the fine sand layer is reached, a hole is drilled with a second expanded diameter (FIG. 3 (b)) which is the same as the outer diameter of the hollow pile, and the diameter of the bulb to be formed before the clay layer. 3 (c) which is the same as the outer diameter of
A hole is drilled at the third enlarged diameter indicated by. That is, in this case, the operator first stops once the display element P1 of the display plate 521 is turned on by operating the steering wheel, and then the rod position detector 5 is raised by the hydraulic cylinders 71 and 72 and detected by the proximity sensor S3. The control of the hydraulic cylinders 71 and 72 is stopped at the position where the body 511 is detected, that is, at the position where the display element P3 of the display plate 521 is turned on. At this time, the enlargement head 4 is fixed at the state shown in FIG.

[0013]

The present invention is constructed and operated as described above. According to the present invention, a long extended head driving rod is used, and it is disposed above the enlarged head driving rod. All of the mechanisms that control the enlarged head, such as the vertical movement drive unit, rod position detector, rotary drive unit, and control unit, to each of the expanding positions are installed on the ground, so that the operation of the enlarged head under the ground is required. Exact control can be performed on the ground, the excavation operation is assured, wear and breakage of related members are suppressed as much as possible, and an effect of achieving efficient excavation work is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram of one embodiment showing a specific configuration of a rod position detector, a control unit, and the like according to the present invention.

FIG. 3 is an enlarged view of an enlarged head according to the present invention ((a).
First enlarged diameter, (b). Second enlarged diameter, (c). It is the schematic which shows (3rd expansion diameter).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Expansion head drive rod 2 Screw 3 Axis 4 Expansion head 5 Rod position detector 6 Rotation drive unit 7 Vertical movement drive unit 8 Control unit

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02D 7/00 E02D 5/44

Claims (4)

(57) [Claims] 1. An enlarged head driving rod having a plurality of rods arranged in parallel with each other and having a screw provided therearound and arranged rotatably and vertically movable; and An enlargement head rotatably supported by a horizontal shaft provided below and provided with respective enlargement blades respectively connected to the plurality of rods, and a rotation drive unit for rotationally driving the enlargement head drive rod. A vertical drive unit having a hydraulic cylinder connected to each of the plurality of rods and driving the enlarged head driving rod in the vertical direction; and a rod position for detecting a vertical movement position of the enlarged head driving rod. Detecting means; and enlarging the enlarged head in accordance with information output by the rod position detecting means. The first expanded diameter that is the same as the inner diameter of the hollow pile to be built (2). The second expanded diameter that is the same as the outer diameter of the hollow pile to be built (3). Control means for setting and controlling a third expanded diameter equal to the outer diameter of the bulb diameter to be created, wherein the driving rod and the expanded head are arranged underground during operation, and the rotation driving means; Vertical driving means,
An excavator wherein the rod position detecting means and the control means are arranged on the ground. 2. A displacement section connected to the enlarged head driving rod and / or the vertical movement driving means, wherein the rod position detecting means is displaced together with the enlarged head driving rod and a piston rod in the vertical movement driving means. The excavator according to claim 1, further comprising: a fixing portion. 3. The fixed portion includes a first proximity sensor configured to detect a first position corresponding to the first enlarged diameter of the enlarged head, wherein the displacement portion has a second enlarged diameter. A second proximity sensor that detects a corresponding second position, a third proximity sensor that detects a third position corresponding to the third enlarged diameter, and the first, second, and third The excavator according to claim 2, further comprising first, second, and third light-emitting display elements that light up and display in response to the operation of the proximity sensor. 4. The control means includes: an oil tank for storing oil to be supplied to the hydraulic cylinder; a pump for generating hydraulic pressure; and a lighting state of the first, second, and third lighting display elements of a fixed portion. The excavator according to any one of claims 1 to 3, further comprising: a switching valve configured to switch and control the flow of the oil in the oil tank by operating the steering wheel based on the steering wheel.