JPH08319787A - Cylindrical hole excavating device - Google Patents

Abstract

PURPOSE: To excavate a cylindrical hole for an electric pole or the like efficiently by excavating the ground by a center bit and a screw, and after storing excavated sediment in a cylindrical casing, discharging the excavated sediment by a push-out member. CONSTITUTION: A first driving shaft 9 is driven by a second driving device 7 through a clutch member 8 so as to excavate the ground G by a center bit 22 provided at the tip and a screw 34. A cylindrical casing 12 provided with bits 13 at the tip is then rotated by driving a second driving shaft 10 by the second driving device 7 through the clutch member 8, and also slided downward along the first driving shaft 9 by a first driving device 6. Excavated sediment is stored in the casing 12 by the blades of the screw 34. The whole excavating device is then lifted and moved onto a transporter, and the casing 12 is lifted to discharge the excavated sediment onto the transporter by a push-out member 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for excavating a cylindrical hole, and more particularly to a cylindrical hole excavating apparatus for excavating a hole when a columnar object such as a utility pole is to be erected.

[0002]

2. Description of the Related Art Generally, when a pillar such as a utility pole is to be erected on the ground such as a road surface, when asphalt or the like is laid on the surface of the ground, the breaker or the like is used to crush and eliminate it. A cylindrical hole slightly larger than the diameter of the columnar object is excavated, then the lower end of the columnar object is inserted into this cylindrical hole, and then earth and sand etc. are backfilled in the gap between this cylindrical hole and the columnar object. . By the way, in the conventional work for excavating this cylindrical hole, an excavator generally having a screw,
That is, the earth auger is used.

However, as described above, when crushing and removing asphalt and the like by using a breaker or the like, noise is generated, and disposal of finely crushed waste becomes a problem. Further, when the cylindrical hole is excavated using the earth auger, the earth and sand due to the excavation are discharged while being compacted between the screw blades. This earth and sand cannot be easily separated from between the blades of the screw, and the worker who follows the need to clean the blade of the screw reduces the work efficiency.

From the above, the inventors of the present invention carried out the first step of fixing the tip of the first drive shaft supported by the base body and having the bit at the tip to the ground, and the guide shaft for the drive shaft. Excavation of a cylindrical hole consisting of a second step of lowering and excavating a cylindrical casing having a bit at the tip as ground, and a third step of accommodating earth and sand in the cylindrical casing and carrying out the earth and sand Method, a first drive shaft extended from a second drive device supported by a base, a second drive shaft disposed on the outer periphery of the first drive shaft, and a guide to the second drive shaft And a cylindrical casing driven by a second drive shaft below the support, and a first drive device interposed between the base body and the support, and a drilling device for a cylindrical hole. It was previously proposed (Japanese Patent Application No. 7-90932).

[0005]

By the way, in the cylindrical hole drilling apparatus as described above, it is possible to reduce the labor of the drilling work of the cylindrical hole, improve the working efficiency, and prevent the noise pollution. When excavating a cylindrical hole in the ground, a relatively large driving force is required because the excavation is performed only by the cylindrical casing having the bit. Further, a device for holding the earth and sand in the cylindrical casing and discharging it from the hole was required.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and includes a first tube 1 having one end attached to a base 2, and the first tube 1. A second pipe body 3 slidably disposed on the tip end of which a support body 4 and a first bearing 5 are provided, and a first pipe body 2 and a tip end of the second pipe body 3 which are connected to each other. Drive device 6 of the second tubular body 3, one end of which is connectable to a second drive device 7 attached to the base body 2 via a clutch member 8 and the other end of which is a center bit. A first drive shaft 9 having a screw 22 and a screw 34, and arranged on the outer periphery of the first drive shaft 9 and supported by an upper bearing 21 and a lower bearing 37, and via a clutch member 8 to the second drive device 7. The second drive shaft 10 that can be detached and attached and has a key material 10C mounted on the outer periphery, and a second drive shaft 10 that uses the key material 10C. A cylinder that rotates with the drive shaft 10 and slides up and down along the second drive shaft 10 via the support 4 and the first bearing 5 by the first drive device 6 and has the bit 13 at the tip. The present invention provides an excavating device for a cylindrical hole, which comprises a cylindrical casing 12.

An extruding member 17 slidable in the cylindrical casing 12 and guided by the second drive shaft 10 is provided, and a bit 13 provided at the tip of the cylindrical casing 12 is preferably directed downward. Are mounted so as to diverge outward so as to have an angle θ.

[0008]

[Operation] According to the cylindrical hole excavating device of the present invention, the cylindrical casing 12 descends along the first drive shaft 9 fixed in the ground G at the tip, and together with the screw 34, moves in the underground. Since excavation is performed, stable excavation of a cylindrical hole (excavation into a cylindrical shape) can be performed with a small driving force.

The excavated earth and sand are stored in the cylindrical casing 12 and discharged by the blades of the screw 34, and can easily be discharged from the cylindrical casing 12 by the pushing member 17 in the cylindrical casing 12. Therefore, it is possible to improve workability as well as save labor.

[0010]

[Embodiment] An embodiment of a cylindrical hole excavating method and apparatus according to the present invention will be described below with reference to FIGS. 1 to 5. FIG. 1 is a side view of a cylindrical hole excavating device, in which one end of a first pipe body 1 is attached to a base body 2 (base member) located at an upper end portion, and a second pipe is provided in the first pipe body 1. The tube body 3 is attached so as to be able to expand and contract by sliding in the vertical direction. The support 4 is provided at the lower end of the second pipe 3, and the first bearing 5 is arranged at the center of the support 4.
A two-stage telescopic hydraulic cylinder 6 is mounted as a first drive device between the base body 2 and the base body 2, whereby the second pipe body 3 can be expanded and contracted with respect to the first pipe body 1. It is like this.

A second drive device 7 such as a hydraulic motor is provided on the base body 2, and the rotation of the second drive device 7 is transmitted to a first drive shaft 9 via a clutch member 8 (FIG. 4). A tubular second drive shaft 10 arranged outside this is connected in a removable manner. Then, the hydraulic cylinder 11 arranged between the base body 2 and the connecting / disconnecting member of the clutch 8 is operated to move the clutch member 25 to connect / disconnect.

A cylindrical casing 12 is arranged at the tip of the second drive shaft 10, and the cylindrical casing 12 is provided.
At the tip of each of the plurality of bits 13, a plurality of bits 13 are spread and projected so as to have an angle θ as shown in FIG. 1, and earth and sand holding blades 15 are provided on the inner surface side thereof. In addition, the second drive shaft 10 is provided in the cylindrical casing 12.
Extruding member 17 having a tip bearing 16 supported by the center
Are arranged so as to be movable up and down along the drive shaft 10 while rotating with the second drive shaft 10. Further, a flexible film 18 is provided between the tip end bearing 16 and the upper portion of the cylindrical casing 12 so that the earth and sand are covered with the tip end bearing 16 and the first bearing 5.
It prevents you from getting in.

More specifically, the first tubular body 1 and the second tubular body 3 are made of a metal cylinder having a large number of holes as shown in FIGS. A guide member 19 attached to the inside of the tube body 1 and a key-shaped guide member 20 attached to the outside of the second tube body 3 are arranged to be movable in the axial direction while preventing rotation in the circumferential direction. Has been done. The base body 2 is attached to, for example, an arm provided on a traveling carriage such as a truck, and the second drive device 7 (excavation drive device) attached to the base body 2, the first drive shaft 9, and the second drive device 7 are attached. The drive shaft 10 is connected via a clutch member 8 as shown in FIG.

That is, the first drive shaft 9 and the tubular second drive shaft 10 are double shafts, and the first bearing 5 and the lower bearing provided at the lower end of the second tubular body 3 respectively. 37, a center bit 22 and a screw 34 are provided at the tip of the first drive shaft 9, and the base portion of the first drive shaft 9 has a rectangular protrusion 23 as a connecting mechanism. A square hole 24 into which (FIG. 4) is fitted is provided.

Next, the clutch member 8 will be described in detail.
A clutch member 25 (sliding member) is fitted to a tubular body 27 fixed to a drive shaft 28 of the second drive device 7 by a hydraulic cylinder 11 so as to be vertically movable. Keyway-shaped or spline-shaped engaging portions 25a and 25b are provided above and below the clutch member 25, respectively.
The a is adapted to be joined to and disengaged from an engaging portion 27a formed on the cylindrical body 27 like a key. The engaging portion 25b is formed like a key on the upper end of the upper shaft 10a of the second drive shaft 10 so as to be connected to and disengaged from the engaging portion 26.

Therefore, as shown in FIG. 4, when the hydraulic cylinder 11 is operated to pull up the tubular clutch member 25 constituting the clutch mechanism 8, the engaging portions 25a and 27a are formed.
And are not engaged, and the clutch mechanism is in the "disengaged" state. On the other hand, the rectangular projection 23 provided so as to project at the lower end of the tubular body 27 and the square hole 24 are engaged with each other. Therefore, in this state, the first drive shaft 9 driven by the hydraulic motor which is the second drive device 7 is driven.

Next, when the hydraulic cylinder 11 is extended and the clutch member 25 is moved downward as shown by the arrow in FIG. 1, the upper structure 10 of the second drive shaft 10 is shown as shown in FIG.
The engaging portion 26 provided at the upper end of a and the engaging portion 25b provided at the lower portion of the sliding member 25 engage with each other, and the engaging portion 25
The a and the engaging portion 27a provided at the lower end of the tubular body 27 are engaged with each other.

That is, the power of the second drive device 7 which is the drive device for excavation can drive the second drive shaft 10 from the tubular body 27 through the sliding member 25. Further, if the clutch member 25 is held in the middle between the upper and lower sides, the first drive shaft 9
And the second drive shaft 10 can be driven simultaneously. On the other hand, the second drive shaft 10 is separated into an upper shaft 10 a and a lower shaft 10 b and connected by a joint 30, and an upper bearing 21 is arranged inside the joint 30. This second drive shaft 1
A lower bearing 37 is provided between the first drive shaft 9 and the lower end of 0.

A key 10c is provided so as to project in the longitudinal direction of the outer peripheral surface of the second drive shaft 10, and the cylindrical casing 12 is provided.
Can be moved up and down by the first drive device 6 while rotating at the same time as the second drive shaft 10, and the guide member 33 (FIG. 5) provided at the tip of the pushing member 17 (FIG. 1) is used. It is adapted to slide vertically by being guided by the inner surface of the cylindrical casing 12.

Next, a case will be described in which a cylindrical hole is to be excavated at a predetermined position on the ground G such as a road surface by using the apparatus configured as described above. In the initial stage of excavation work, as shown in FIGS. 1 and 4, the clutch member 25 is raised by the hydraulic cylinder 11 to bring the first drive shaft 9 and the second drive device 7 into a joined state, and the second drive The shaft 10 is separated and the cylindrical casing 12 is kept in the non-driving state.

(Screw excavation, casing earth and sand holding method) In this state, the center bit 22 at the tip of the first drive shaft 9 is positioned at the center of the portion of the ground G where a cylindrical hole is to be bored (FIG. 6 (a)). Then, the second driving device 7 is driven and the tip of the arm 14 is lowered, that is, the base 2
Lowering the center bit 22 and screw 34
To excavate a cylindrical hole 35 in the ground G [Fig. 6
(B)].

When the cylindrical hole 35 is excavated to a predetermined depth in this way, the clutch member 8 is moved by the hydraulic cylinder 11.
Is operated to join the second drive device 7 and the second drive shaft 10, and the hydraulic cylinder that is the first drive device 6 is operated to lower the cylindrical casing 12 while rotating it. By this operation, while the periphery of the cylindrical hole 35 is cut by the bit 13 attached to the tip of the cylindrical casing 12, the earth and sand in the cylindrical hole 35 is stored therein [FIG.
(C)]. At this time, since the bit 13 provided at the tip of the cylindrical casing 12 is attached so as to spread at an angle θ, a gap d is formed between the cylindrical casing 12 and the ground G.

Thereafter, after the cylindrical casing 12 reaches a predetermined depth, the arm 14 is moved upward to form a predetermined cylindrical hole 35a by excavation (FIG. 6).
(D)]. After that, the earth and sand stored in the cylindrical casing 12 is moved to a carrier such as a truck 36 while being held by the screw 34 shown in FIG. 1, and the hydraulic cylinder that is the first drive device 6 is contracted. By doing so, the cylindrical casing 12 rises, and the pushing member 17 is fixed to the metal fitting 38.
Due to the presence of the presence, the upward movement is blocked, and the earth and sand are discharged from the cylindrical casing 12 [FIG. 6 (e)].

Further, a hole having an arbitrary depth can be drilled by repeating the same drilling (FIGS. 6A to 6E) below the cylindrical hole 35. At this time, in the cylindrical hole 35, the ground G is first cut by the center bit 22 and the screw 34, and thereafter the soil is collected and discharged while cutting the periphery thereof by the bit 13 of the cylindrical casing 12, so that the driving is relatively small. The cylindrical hole 35 can be excavated and formed by force.

(Method of excavating simultaneously with screw and casing) Referring to FIGS. 7 (a) to 7 (e), another method of excavating and forming a cylindrical hole in the ground G using the cylindrical hole excavating device will be described. explain. First drive shaft 9 and second drive shaft 1
By simultaneously lowering and rotating 0 at the same time, the center bit 22 at the tip of the first drive shaft 9, the screw 34, and the tip bit 13 of the cylindrical casing 12 both serve as the ground G.
The earth and sand can be stored in the cylindrical casing 12 while excavating. In this case as well, the hole 35 is formed by the same method.
It is possible to excavate a hole of any depth by repeating the excavation below.

(Method of pushing up the earth and sand by the casing after excavating one pitch with the screw. Pushing the casing after the completion of one excavation) Also, as shown in FIGS. First, the upper hole 35b having the depth D ₁ is inserted into the center bit 22 and the screw 34 for a predetermined depth D of
Or by excavating at the same time as the bit 13 of the cylindrical casing 12 and storing the earth and sand in the cylindrical casing 13, the depth D ₂ is set by the center bit 22 and the screw 34.
The central hole 35c is excavated, the cylindrical casing 12 is lowered, and the earth and sand are stored in the cylindrical casing 12 again.

Further, as in the case of excavating the central hole 35c, a lower hole 35d having a depth D is excavated by the center bit 12 and the screw 34, and the earth and sand are stored in the cylindrical casing 12 to form a predetermined cylindrical hole. It is also possible to form 35. The excavation is not limited to the above-described embodiment, and various excavation methods can be adopted by selectively operating the hydraulic cylinder 11 that operates the clutch member 8 and the first drive device 9. Also in this case, a hole having an arbitrary depth can be drilled by repeating the drilling under the hole 35 by the same method [FIGS. 8A to 8G].

[0028]

As is apparent from the above description, according to the present invention, the center bit 2 mounted on the first drive shaft 9 is provided.
2 and the screw 34 first excavate the ground G, and then the cylindrical casing 12 having the bit 13 at the tip and the soil 34 are stored and discharged, so that the cylindrical hole excavation work is labor-saving and the work efficiency is improved. Not only can it be improved and noise pollution can be prevented, but also the driving force thereof can be made comparatively small, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing a cylindrical hole excavating device according to an embodiment of the present invention by cutting a part thereof.

FIG. 2 is a front view showing an engaged state of a first tubular body and a second tubular body.

FIG. 3 is a sectional view of an intermediate portion of FIG.

FIG. 4 is a front view showing a driving section of the cylindrical hole excavating device in detail.

FIG. 5 is a plan view showing a cylindrical casing and an extruding member.

6A to 6E are explanatory views of a first excavation pattern of a cylindrical hole.

7A to 7E are explanatory views of a second excavation pattern of a cylindrical hole.

8A to 8G are explanatory views of a third excavation pattern of a cylindrical hole.

[Description of sign]

DESCRIPTION OF SYMBOLS 1 1st tubular body 2 Base | substrate 3 2nd tubular body 4 Support body 5 1st bearing 6 1st drive device 7 2nd drive device 8 Clutch mechanism 9 1st drive shaft 10 2nd drive shaft 11 Hydraulic cylinder 12 Cylindrical casing 13 Bit 14 Arm 16 Tip bearing 17 Extruded member 18 Flexible membrane 19, 20 Guide member 21 Upper bearing 22 Center bit 23 Square protrusion 24 Square hole 25 Clutch member 25a, 27a
Engagement part 30 Joint 34 Screw 37 Lower bearing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takehiro Ikeda 3-1, 32-1000, Minen-ku, Aichi Prefecture Toeneck Co., Ltd. (72) Inventor Yamato Unno 3-chome, Tamano-shi, Okayama Prefecture No. 1 Mitsui Engineering & Shipbuilding Co., Ltd. Tamano Works (72) Inventor Yoshiki Kubo 3-1, 1-1 Tama, Okayama Prefecture Mitsui Shipbuilding Co., Ltd. Tamano Works (72) Inventor Masayoshi Mitani 3-1, Tamano City, Okayama Prefecture No. 1 Mitsui Engineering & Shipbuilding Co., Ltd. Tamano Works

Claims (3)

[Claims] 1. A first tube body 1 having one end attached to a base body 2, and a support body 4 and a first bearing 5 which are slidably arranged on the first tube body 1 and are provided at the tip. And a second drive body 6 for connecting the base body 2 and the tip of the second pipe body 3 to each other, and a second drive body 6 arranged in the second pipe body 3, one end of which is the base body. 2 can be connected to a second drive device 7 attached to the second drive device via a clutch member 8 and the center bit 2 can be connected to the other end.
2 and a first drive shaft 9 having a screw 34, and is arranged on the outer periphery of the first drive shaft 9 and supported by an upper bearing 21 and a lower bearing 37, and a second drive device 7 via a clutch member 8. The second drive shaft 10 which is detachable and removable and which has the key member 10C mounted on the outer periphery, and the second drive shaft 10 which rotates with the key member 10C. An excavating device for a cylindrical hole, which comprises a cylindrical casing 12 that slides up and down along a second drive shaft 10 via the bearing 5 of FIG. 2. Sliding inside the cylindrical casing 12,
Push-out member 1 guided by the second drive shaft 10
7. The cylindrical hole drilling device according to claim 1, wherein the drilling device is provided with 7. 3. The cylindrical casing according to claim 1 or 2, wherein the bit 13 is mounted so as to expand outward so as to have an angle θ downward.