JP3023950B2 - Enlarged bottom method and excavated casing in all-turn type casing excavation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating method and a drilling casing in an all-rotation type casing excavation method, and more particularly, to an excavating method and an excavating method applied to excavating a hole for a cast-in-place concrete pile. Regarding the casing.

[0002]

2. Description of the Related Art As a method for constructing a cast-in-place concrete pile, an all-casing method, an earth drill method, a reverse circulation method and the like are known. Among them, the earth drilling method and the reverse circulation method have been variously developed for expanding the bottom of the drilling hole and increasing the supporting force at the tip of the pile. However, each has a widening bit and a widening device, and the structure is complicated. In addition, in the case of the reverse circulation method, ancillary equipment such as muddy water treatment equipment is also required.

[0003] On the other hand, the all-casing method is suitable for a stratum in which excavation is difficult because cobble stones, gravel and the like can be preliminarily cut by a cutter bit provided at the end of the casing. In addition, since slime generated during excavation is grasped by a hammer grab, muddy water treatment equipment and the like are unnecessary. The all-casing method includes a method in which the casing is press-fitted into the ground while swinging the casing, and a method in which the casing is press-fitted while fully turning the casing. In any of these methods, an expanded bottom method has not been developed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above technical background, and has the following objects.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an all-rotating casing excavating method and an excavating casing which can expand the bottom without using a special widening bit or a widening device while taking advantage of the all casing method. It is in.

[0006]

The present invention employs the following means to achieve the above object.

Namely the present invention, while the cutter bit rotates the casing provided at a distal end, with press-fitted into the ground, in all swivel casing drilling method for earth removal the interior of the casing, the tip of the casing drilling
The cutter bit is provided at the tip as a milling casing.
A casing body having a notch formed in a peripheral wall thereof;
The casing is accommodated in the notch, and its axis and
An expanding wing pivotally supported at one side edge so as to be rotatable in a direction perpendicular to the direction of movement,
Cutter bits provided at the tip and the other side edge of the expanding wing
Using a drilling casing with
By rotating the casing forward, after digging to a predetermined digging depth with the expanding wing closed , the casing is rotated in the reverse direction.
The cutter bit of the expanding wing.
The present invention relates to a bottoming method in an all-turn casing excavation method, wherein the expanding blade is expanded by a drilling resistance to be used to form a bottom hole.

According to the present invention, a cutter bit is provided at the tip.
Pressing into the ground while rotating the caulked casing
And a full swing type casing that discharges the inside of the casing.
A tip drilling casing for a shing drilling method , wherein the cutter bit is provided at a tip and a notch is formed in a peripheral wall, and a casing body is housed in the notch, and is substantially perpendicular to an axis of the casing body. comprising a spreading blade rotatably one side edge is pivoted in a direction, and a cutter bit which is provided to the tip and <br/> other side edge of the spreading blade, the expansion wings
Is closed by forward rotation of the casing body,
Spread more due to drilling resistance acting on the cutter bit
In drilling casing, characterized in that that.

Further, the present invention resides in an excavating casing, wherein the other side edge is inclined so that the width of the expanding blade increases toward the tip.

[0010] Further, the present invention resides in an excavating casing comprising a stopper for restricting an expanding range of the expanding blade.

Further, according to the present invention, the stopper is provided on an inner surface of the expanding wing and an arm having one end rotatably supported by the casing main body, and the other end of the arm is connected to a periphery of the casing main body. And a guide member having a predetermined length for guiding in a direction.

Further, the present invention resides in an excavating casing, wherein two sets of the notch and the expanding wing are provided at substantially symmetric positions.

According to the construction method of the present invention, a part of the peripheral wall of the distal end portion of the casing is expanded at a predetermined excavation depth. Therefore, the hole wall is excavated by the expanded portion, and the bottom of the excavation hole is expanded. Such a construction method can be carried out by the excavating casing according to the present invention, which has a configuration in which an expanding wing that expands by reverse rotation of the casing is rotatably supported on the periphery of the notch provided in the casing peripheral wall. it can.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a drilling casing according to the present invention, and FIG. 2 is a partially cutaway plan view.
The excavating casing 1 shown in the figure is a tip casing among casings that are sequentially connected with an increase in excavating depth.

The excavating casing 1 includes a casing body 2 provided with a cutter bit 10 at a tip thereof, and two spread wings 3 provided at symmetrical positions on a peripheral wall of the casing body 2 at an angle of 180 degrees. It has. A notch 4 having a predetermined length is formed in the peripheral wall of the casing main body 2 from the tip thereof, and the notch 4 has a shape whose width increases toward the tip. A plurality of hinges 5 for attaching the expanding wings 3 are provided on the periphery of the cutout 4 extending parallel to the axis of the casing body 2.

FIG. 3 is a front view showing only the expanding wing 3, and FIG. 4 is a plan view. The expanding wing 3 is a curved wing plate having the same curvature as that of the casing main body 2, and has a plurality of hinge portions 6 fitted to the hinge portion 5 on one side edge thereof. The expanding wing 3 has the same shape as the notch 4 as a whole, and the other side edge 7 on the side opposite to the hinge 6 is inclined so that the width increases toward the tip. By the way, in this embodiment,
The width of the tip of the expanding wing 3 is set to 90% of the peripheral wall of the casing body 2.
It corresponds to the angle range of degrees. Cutter bits 8 and 9 are provided at the tip and the other side edge 7 of the spread wing 3, respectively. Each of the cutter bits 8, 9, and 10 is provided with a carbide tip capable of cutting cobblestone, gravel, bedrock, and the like.

The expanding wing 3 is accommodated in the notch 4, and the pin 11 penetrates through the hinges 5 and 6 so as to be rotatably supported in a direction perpendicular to the axis of the casing body 2.
The expansion blade 3 forms a cylindrical surface together with the casing body 2 in a state where the blade is closed. That is, the spread wing 3 is usually a part of the peripheral wall of the casing 1. In this closed state,
The cutting edge of the cutter bit 9 is locked on the periphery of the notch 4.

The excavating casing 1 has a stopper mechanism for regulating the expanding range of the expanding blade 3. As shown in FIGS. 2, 3 and 4, the stopper mechanism has an arm 13 pivotally supported at one end to the casing main body 2 via a pin 12, and an inner surface of the expanding wing 3 in a circumferential direction. And a pair of guide ridges 14 provided along. A guide groove 15 is formed in the guide protrusion 14, and the other end of the arm 13 is pivotally supported by the guide groove 15 via a pin 16. When the spread wing 3 is closed, the arm 13 moves the guide ridges 14, 14.
The pin 16 is moved from one end to the other end of the guide groove 15 as the expanding wing 3 is opened. Therefore, the spread wing 3 is in the range of movement of the pin 16
Expands only in the rotation range of.

Next, a construction method according to the present invention using the excavating casing 1 will be described with reference to FIGS. 5, 6 and 7. FIG. FIG. 5 is a front view showing the entire excavator, and FIGS. 6 and 7 are plan views schematically showing an excavation state. As shown in FIG. 5, all-turn boring machine 1 installed on the ground
7, the tip excavation casing 1 and the casing 21 sequentially connected thereto are pushed into the ground while rotating forward (in the direction of the arrow in FIG. 6 ), and a hole having the same diameter as the casing outer diameter is excavated. At this time, the slime inside the tip excavation casing 1 is discharged by the hammer grab 23 suspended by the crawler crane 22.

When the excavation depth reaches a predetermined depth, the casings 1 and 21 are reversely rotated as indicated by solid arrows in FIG. As a result, the expanding wing 3 gradually expands as indicated by chain lines A, B, and C in FIG. 2 due to the excavation resistance acting on the cutter bit 9. With the expansion of the expanding wings 3, the arm 1
When the pin 3 rotates and the pin 16 reaches the end of the guide groove 15, the expansion is stopped (see the dashed line C in FIG. 2 and the wing 3 shown by the dashed line in FIG. 1). In this way, the bottom of the excavation hole is expanded by the cutter bit 9 of the expanding wing 3 that expands. Since the other side edge 7 to which the cutter bit 9 is attached is inclined, the shape of the expanded bottom hole 24 is substantially conical (see FIG. 5).
reference). That is, a shape suitable for exhibiting the increased tip supporting force as a cast-in-place concrete pile is obtained.

The slime generated by excavation of the spread wing 3 is taken into the casing 1 along the inner surface of the spread wing 3 as shown by a broken line arrow in FIG. After the opening, the casing 1,
21 is rotated forward, and the spread wing 3 is pulled up in a closed state.

The above embodiment is merely an example, and the present invention can be variously modified. In the above-described embodiment, the cutout for attaching the expanding wing is formed from the front end of the casing, but the peripheral wall of the casing may be opened like a window. Further, the number of spread wings is not limited to two.

[0023]

As described above, according to the present invention, it is possible to expand the bottom of a drilling hole without using a special widening bit or a widening device while taking advantage of the all-casing method. The cast-in-place concrete pile with increased number can be constructed.

[Brief description of the drawings]

FIG. 1 is a front view showing a drilling casing according to the present invention.

FIG. 2 is a plan view.

FIG. 3 is a front view showing an expanding wing.

FIG. 4 is a plan view.

FIG. 5 is a front view showing the entire excavator for carrying out the present invention method.

FIG. 6 is a diagram schematically showing a state at the time of normal excavation.

FIG. 7 is a view schematically showing a state at the time of hole excavation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Excavation casing 2 ... Casing main body 3 ... Expanding wing 4 ... Notch part 5 ... Hinge part 6 ... Hinge part 7 ... Other side edge 8 ... Cutter bit 9 ... Cutter bit 10 ... Cutter bit 11 ... Pin 13 ... Arm 14 ... Guide ridge 15 ... Guide groove 23 ... Hamamagrub 24 ... Bottom hole

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuaki Shimamura 2524-2 Oyama Oyama, Suzaka-city, Nagano 401 (72) Inventor Jun Shinjo 1-29-15-1 Chuo, Nakano-ku, Tokyo MRI Within Industrial Co., Ltd. (56) References: Japanese Utility Model Application Sho 55-36238 (JP, U) Japanese Patent Publication No. 5-77840 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21B 7 / 20 E21B 7/28 E02D 5/44

Claims (6)

(57) [Claims] 1. A while cutter bit rotates the casing provided at a distal end, with press-fitted into the ground, in all swivel casing drilling method for earth removal the interior of the casing, as the tip drilling casing of the casing, the tip Previous
The cutter bit was provided and a notch was formed on the peripheral wall.
A casing body;
One side edge of the main body is rotatable in a direction substantially perpendicular to its axis.
And the tip of the spreading wing and the other side edge are pivotally supported.
Use a drilling casing with a provided cutter bit.
And by rotating the casing forward,
After excavating to a predetermined excavation depth in a closed state, the casing is rotated in the reverse direction, so that the
Due to excavation resistance acting on the cutter bit
A bottoming method in a full-turn casing excavation method, characterized in that a wing is expanded to form a bottoming hole. 2. A casing having a cutter bit at its tip.
Pressing the ground into the ground while rotating the
For all-rotation type casing excavation method to remove soil inside
A tip drilling casing, said cutter bits are provided at the distal end, and a casing body which notch is formed in the peripheral wall, is housed in the cutout portion, rotates in a direction substantially perpendicular with its axis in said casing body An expanding wing freely pivotally supported on one side edge; and a cutter bit provided on a tip of the expanding wing and on another side edge, wherein the expanding wing is closed by forward rotation of the casing body.
And drilling resistance acting on the cutter bit due to reverse rotation
An excavating casing characterized by being expanded by a drill. 3. The excavating casing according to claim 2, wherein the other side edge of the expanding wing is inclined so as to widen toward a tip. 4. The excavating casing according to claim 2, further comprising a stopper for restricting an expanding range of the expanding blade. 5. An arm having one end rotatably supported by the casing main body and one end of the stopper being provided on an inner surface of the expanding wing, and the other end of the arm being guided in a circumferential direction of the casing main body. The excavating casing according to claim 4, further comprising a guide member having a predetermined length. 6. The notch and the expanding wing are located at substantially symmetric positions.
The drilling casing according to claim 2, 3, 4, or 5, wherein the casing is provided as a set.