JP2017227066A - Expansion digging apparatus for cast pile and expansion digging method for cast pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, since sufficient upper/lower height (length) of an expansion blade is not ensured, a digging area of the expansion blade is small, the expansion blade is moved downward little by little while expanding the expansion blade, resulting in that digging work time is long.SOLUTION: A holding/fixing apparatus 25 is provided, which comes in contact with an inner peripheral surface of a casing K and makes an entire apparatus a fixed state to the casing K. On a holding/fixing frame 26 of the holding/fixing apparatus 25, an expansion blade 20 is provided, which comprises in a vertically movable manner relatively to the holding/fixing frame 26 a blade body 17 digging an inclined surface 14A of an expansion hole 14 and a longitudinal digging part 18 digging an expansion circular column hole part 14B of a circular column shape at the lower part of the expansion hole 14 created at the lower part of the blade body 17. The expansion blade 20 is configured to dig the expansion hole 14 by outside rotation on an attachment shaft 16 having a lateral axis as a center. So that a circular column hole bottom 14C of the expansion circular column hole part 14B of the expansion hole 14 is formed in horizontal, outside rotation of the expansion blade 20 and downward movement of the expansion blade 20 are synchronized.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an enlarged excavation apparatus for cast-in-place piles and an expanded excavation method for cast-in-place piles.

2. Description of the Related Art Conventionally, a method for excavating an enlarged hole of a cast-in-place pile by causing an enlarged blade to enter and exit from a lower portion of a drilling head in a radial direction with respect to an axis is known (see Patent Document 1).
Also, conventionally, a configuration in which a part of a cylindrical bucket is configured to be rotatable about a longitudinal axis and this rotating part is an enlarged wing is also known (see Patent Document 2).

JP 2005-61205 A JP 2013-53469 A

Among the above-mentioned known examples, the former one cannot sufficiently obtain the vertical height (length) of the expansion wing, so that the area where the expansion wing can be excavated is small, and the expansion wing is lowered little by little while expanding the expansion wing. There is a problem that the excavation work time becomes long.
Among the known examples, the latter can increase the excavation height in one step by sufficiently increasing the height of the bucket by increasing the length of the bucket. Although it has solved, since the expansion wing is rotated in the vertical axis, the excavation surface pressure of the expansion wing with respect to the ground decreases, and it is difficult to excavate the hard ground, and there is a problem that the applicable ground is limited.
This application is designed to expand the range of applicable ground by devising the operating configuration of the expansion wing, improve the excavation shape of the expansion hole, and improve the support capacity of the vertical pile and increase the pulling resistance It is.

According to the first aspect of the present invention, there is provided a holding and fixing device 25 that contacts the inner peripheral surface of the casing K and fixes the entire device to the casing K. The holding and fixing frame 26 of the holding and fixing device 25 is provided with the holding and fixing frame. The vertical shape excavating the wing body 17 excavating the inclined surface 14A of the enlarged hole 14 and the cylindrical enlarged cylindrical hole portion 14B below the enlarged hole 14 provided in the lower portion of the wing body 17 so as to be movable up and down with respect to 26. An enlarged wing 20 having an excavation part 18 is provided, and the enlarged wing 20 is configured to excavate the enlarged hole 14 by rotating outwardly about the mounting shaft 16 of the horizontal axis, and to enlarge the enlarged hole 14. The cast-in-place pile expanding excavator is configured to synchronize the outward rotation of the expanding blade 20 and the lowering of the expanding blade 20 so that the cylindrical hole bottom surface 14C of the cylindrical hole portion 14B is in a horizontal state.
The invention according to claim 2 is configured such that the expansion blade 20 is configured to rotate the expansion blade 20 around the mounting shaft 16 by the expansion / contraction cylinder 40 and to move up and down by the lift cylinder 55 with respect to the holding and fixing frame 26. This is a cast-in-place pile excavation device in which expansion and contraction of the expansion / contraction cylinder 40 and expansion / contraction of the elevating cylinder 55 are synchronized.
The invention according to claim 3 provides an angle adjusting cylinder 45 for changing the angle of the vertical excavation part 18 with respect to the wing body 17 between the wing body 17 of the expansion wing 20 and the vertical excavation part 18, and The wing body 17 is formed such that the side surface of the enlarged cylindrical hole portion 14B excavated by the vertical excavation portion 18 is perpendicular to the ground when the slope 14A of the expansion hole 14 excavated by the 20 wing bodies 17 has a predetermined excavation diameter. The cast-in-place pile expanding excavator in which the angle α between the vertical excavation section 18 is preset by the angle adjusting cylinder 45 is used.
According to a fourth aspect of the present invention, the upper part of the vertically moving frame 30 is attached to the holding and fixing frame 26 of the holding and fixing device 25 so as to be movable up and down with respect to the holding and fixing frame 26. An upper excavation device for a cast-in-place pile in which the upper portion of the expansion blade 20 is rotatably attached by an attachment shaft 16 is provided.
The invention according to claim 5 is an enlargement of a cast-in-place pile provided with a guide guide mechanism 28 for guiding the vertical movement frame 30 between the holding and fixing frame 26 of the holding and fixing device 25 and the vertical movement frame 30. It is a drilling device.
According to the sixth aspect of the present invention, the vertical hole 5 having the same diameter as the casing K press-fitted into the ground W and having a predetermined depth is excavated in advance, and is positioned at a predetermined position above the enlarged cylindrical hole portion 14B of the vertical hole 5. An expansion excavation device 15 having an expansion blade 20 having a wing body 17 and a vertical excavation portion 18 that rotate about a mounting shaft 16 that is a horizontal axis core is inserted into the expansion excavation device 15. The expansion excavator 15 is fixedly held in the casing K, and the rotation of the casing K driven and rotated by the casing rotary press-fitting device 1 is transmitted to the enlarged excavator 15 by the holding and fixing device 25 to be driven and rotated. The expansion wing 20 is rotated about the axis to expand the outer side of the outer diameter of the casing K, and at the same time, the portion of the mounting shaft 16 is lowered with respect to the holding and fixing device 25 and the cylindrical hole of the expansion hole 14 Bottom 14C It is obtained by the enlargement drilling method of place pile to excavate a horizontal state.
In the invention of claim 7, the slope 14A of the enlarged hole 14 excavated by the wing body 17 of the enlarged wing 20 has a predetermined excavation diameter, and the side surface of the enlarged cylindrical hole portion 14B excavated by the vertical excavated part 18 is against the ground. The expansion excavator 15 is inserted into the vertical hole 5 with the angle α between the wing body 17 and the vertical excavation section 18 set in advance by the angle adjustment cylinder 45 so that the vertical excavation unit 18 is held vertically. The vertically moving frame 30 with the mounting shaft 16 of the expanding blade 20 attached to the frame 26 is lowered by the lifting cylinder 55, the vertically moving frame 30 is lowered by the lifting cylinder 55 and the expanding blade 20 is rotated by the expansion / contraction cylinder 40. This is an expanded excavation method for cast-in-place piles that are excavated in synchronism with each other.

According to the first aspect of the present invention, the upper part of the expansion wing 20 having the wing body 17 having a plurality of excavation bodies 33 arranged in parallel on the outer surface and the vertical excavation section 18 rotatably provided on the wing body 17 is attached to the horizontal axis. Since the shaft 16 is pivotably attached, the excavation surface pressure of the expansion wing 20 against the ground can be improved, the hard ground can be excavated, the range of excavation applicable ground can be expanded, and the expansion wing 20 is lowered. 14C, the cylindrical hole bottom surface 14C of the enlarged cylindrical hole portion 14B of the enlarged hole 14 is substantially horizontal, the lower surface of the enlarged portion can be leveled, and the bottom surface of the enlarged portion has a stable shape. .
In the second aspect of the invention, since the expansion and contraction of the expansion / contraction cylinder 40 for rotating the expansion blade 20 and the lifting cylinder 55 for lowering the expansion blade 20 are synchronized, the excavation work of the expansion hole 14 is facilitated. And excavation accuracy can be improved.
In the invention of claim 3, since the blade body 17 and the vertical excavation part 18 of the expansion wing 20 are held at a predetermined angle by the angle adjustment cylinder 45, the excavation accuracy in which the shape of the expansion hole 14 is a predetermined shape is improved. be able to.
According to the fourth aspect of the present invention, the expansion blade 20 is attached to the vertical movement frame 30 and the vertical movement frame 30 is moved up and down with respect to the holding and fixing frame 26, so that the vertical configuration of the expansion blade 20 can be simply configured.
In the fifth aspect of the present invention, since the raising and lowering of the enlarged blade 20 is guided by the guide guide mechanism 28, excavation work can be performed stably.
In invention of Claim 6, excavation surface pressure with respect to the ground of the expansion wing | blade 20 can be improved, hard ground can be excavated, and the supporting force increase of the vertical pile and the expansion part of a vertical pile and the extraction resistance force can be increased. .
In invention of Claim 7, the excavation precision which makes the shape of the enlarged hole 14 predetermined shape can be improved.

The front view of a casing rotation press-fitting apparatus and an expansion excavation apparatus. The front view which abbreviate | omitted a part of expansion digging apparatus with an expansion wing retracted. The same side view. The front view which abbreviate | omitted a part of expansion digging apparatus with an expansion wing expanded state. The same side view. The same side view. The front view of the vicinity of a guide guide mechanism. The same side view. Explanatory drawing of an enlarged wing in an expanded state. B sectional drawing of FIG. FIG. 4 is a C cross-sectional view and an exploded view of FIG. 3. D sectional drawing of FIG. E sectional drawing of FIG. F sectional drawing of FIG. G sectional drawing of FIG. H sectional drawing of FIG.

  An embodiment of an enlarged excavation method and an apparatus for carrying out the method of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a casing swivel casing rotary press-fitting device (FIG. 1). The casing rotary press-fitting device 1 is installed on the ground W to press-fit the casing K into the ground W. The casing rotary press-fitting device 1 only needs to be able to press-fit the casing K into the ground W, and the configuration thereof is arbitrary. Although not shown, the base frame, the elevating frame that moves up and down relative to the base frame, and the casing K are held in a fixed state. A casing fixing mechanism and a casing driving rotating mechanism for driving and rotating the casing K fixed by the casing fixing mechanism are provided, and the casing K fixed by the casing fixing mechanism is press-fitted while being rotated by the casing driving rotating mechanism.

Next, a vertical hole drilling device (not shown) called a “hammaglab” or the like is inserted into the casing K, and a vertical hole 5 for a vertical pile having a predetermined diameter and a predetermined depth is excavated in advance.
The vertical hole excavator is suspended by a wire 12 hanging from the boom 11 of the base machine 10 and inserted into the casing K for excavation.
Next, an expansion excavator 15 for excavating the expansion hole 14 for forming an enlarged portion having a large diameter with respect to the diameter of the vertical hole 5 is inserted (FIG. 1).
The expansion excavator 15 is rotatable by an attachment shaft 16 having a horizontal axis, and has a wing body 17 for excavating a slope 14A of the expansion hole 14 and a columnar shape below the expansion hole 14 provided in the lower portion of the wing body 17. An enlarged blade 20 having a vertical excavating portion 18 for excavating the enlarged cylindrical hole portion 14B is provided (FIGS. 2 and 4).

The expansion excavator 15 is inserted so that the lower end of the expansion excavator 15 is positioned on the bottom surface 21 of the vertical hole 5 excavated to a predetermined depth in advance with the wing body 17 positioned at the retracted position. The lower portion of the body 17 and the vertical excavation portion 18 are driven to rotate while rotating upward about the mounting shaft 16, and at the same time, the wing body 17 and the vertical excavation portion 18 are synchronized with the rotation of the enlarged wing 20. The lower end of the vertical excavation unit 18 is moved horizontally so that the moving locus L moves horizontally (FIG. 4).
Therefore, the vertical hole bottom surface 21 of the vertical hole 5 and the cylindrical hole bottom surface 14C of the enlarged cylindrical hole portion 14B are substantially horizontal, the lower surface of the enlarged portion can be horizontal, and the bottom surface of the enlarged portion has a stable shape.

The configuration of the expansion excavator 15 may be configured to have an expansion blade 20 that can be rotated by a mounting shaft 16 having a horizontal axis and can be vertically moved, and other configurations are arbitrary. An example is shown below.
The enlarged excavator 15 is configured by providing a holding and fixing device 25 that fixes the enlarged excavating device 15 to the inner peripheral surface of the casing K, and the holding and fixing device (gripper) 25 may have any configuration, but the holding and fixing frame 26 may be used. A plurality of contact bodies (stabilizers) 27 that enter and exit in the radial direction are provided in the circumferential direction (FIGS. 11 and 12), and the contact body 27 is brought into contact with the inner surface of the casing K to expand the excavator 15. Is rotated integrally with the casing K.
An upper part of the vertically moving frame 30 is attached to the holding and fixing frame 26 of the holding and fixing device 25 via a guide guide mechanism 28 described later so as to be movable up and down with respect to the holding and fixing frame 26.

The vertically moving frame 30 includes a pair of plate members 31 (FIG. 3), the mounting shaft 16 is provided so as to span the pair of plate members 31, and the expansion blade 20 (wing body 17 is attached to the mounting shaft 16. ) The upper part of) is attached in a freely rotatable manner.
The wing body 17 of the expansion wing 20 is formed to have a predetermined length in the vertical direction, and a plurality of excavation bodies (excavation bits) 33 are arranged in parallel at predetermined intervals in the length direction on the outer surface side of the wing body 17. . When a part of the plurality of excavating bodies 33 are arranged in parallel in the length direction on the outer surface side of the wing body 17 so as to protrude at least in the crossing direction with respect to the rotation axis of the expansion excavating apparatus 15, the expanding wing 20 In combination with the horizontal axis of the mounting shaft 16 rotating in the crossing direction with respect to the rotational axis of the expansion excavator 15, the surface pressure of the cutting surface per unit area of the expansion blade 20 can be increased. It is possible to excavate hard ground, and the range of applicable ground can be expanded.

That is, when the magnifying blade 20 is rotated in the vertical axis as in the prior art, the excavating body 33 moves in an arc with respect to the rotational axis of the magnifying excavator 15, so that the surface pressure of the cutting surface per unit area decreases. Although the hard ground was not excavated, this application realizes this.
One end of the expansion / contraction cylinder 40 is attached to a predetermined position between the upper and lower sides of the wing body 17, and the other end of the expansion / contraction cylinder 40 is attached to the vertical movement frame 30 side by an attachment shaft 41.
When the expansion / contraction cylinder 40 is extended, the wing body 17 is rotated outwardly about the attachment shaft 16, and the expansion wing 20 is inclined and expanded in a downwardly spread state located outside the outer diameter of the casing K. When the expansion / contraction cylinder 40 is contracted, the expansion blade 20 is stored in the casing K.
The vertical excavation portion 18 is rotatably attached to the lower portion of the wing body 17 by an attachment shaft 43 (FIG. 2). An angle adjustment cylinder 45 is provided between the vertical excavation unit 18 and the wing body 17. One end of the angle adjustment cylinder 45 is rotatably attached to the wing body 17, and the other end of the angle adjustment cylinder 45 is attached to the vertical excavation part 18 side.

FIG. 9 shows a state in which the wing body 17 is expanded (upward rotation of the expansion wing 20), and the vertical excavation portion 18 has an inclined surface 14 </ b> A of the expansion hole 14 as shown in “G” in FIG. 9. When excavating to a predetermined excavation diameter, the angle α between the expansion blade 20 and the vertical excavation part 18 is set so that the enlarged cylindrical hole part 14B excavated by the vertical excavation part 18 is perpendicular to the ground W. It is preset by the adjustment cylinder 45.
That is, when the angle adjusting cylinder 45 is reduced, the angle α between the enlarged blade 20 and the vertical excavating portion 18 becomes small, and when the angle α between the enlarged blade 20 and the vertical excavating portion 18 becomes small, the enlarged hole 14 is enlarged. The diameter is increased and the angle adjustment cylinder 45 is expanded and contracted according to the enlarged diameter excavated by the enlarged blade 20 to set the angle α between the enlarged blade 20 and the vertical excavating portion 18. During excavation of the hole 14, the expansion and contraction of the angle adjusting cylinder 45 is stopped.

The other end of the angle adjusting cylinder 45 is pivotally attached to a mounting portion 46 provided in the vertical excavation portion 18. The attachment portion 46 integrally fixes the outer end of the attachment portion 46 to the inner surface of the vertical excavation portion 18, the inner end of the attachment portion 46 projects toward the center of the enlarged excavation device 15, and the length of the attachment portion 46. The other end of the angle adjusting cylinder 45 is attached to a predetermined position in the direction.
A scraper 48 is provided on the side surface of the vertical excavation unit 18. The scraper 48 is provided so as to protrude in the circumferential direction on the side surface in the rotational direction of the vertical excavation unit 18 (FIG. 18), and a sediment receiver 49 for collecting sediment collected by the scraper 48 is provided below the scraper 48 ( Figure 2).

Reference numeral 50 denotes an opening / closing lid provided on the lower surface of the earth and sand receiver 49, and 51 denotes an operation lever for opening / closing the opening / closing lid 50.
Thus, when the expansion blade 20 is simply pivoted horizontally about the mounting shaft 16 to expand the expansion hole 14, the movement locus L along which the lower end of the vertical excavation portion 18 moves becomes an arc surface. The wing body 17 and the vertical excavation part 18 of the expansion wing 20 are lowered by the elevating cylinder 55 according to the extension of the cylinder 40 for use, and the movement locus L of the lower end of the vertical excavation part 18 is made horizontal (FIG. 1).
The lifting / lowering cylinder 55 may be configured to lower the vertically moving frame 30 in accordance with the expansion / contraction of the expansion / contraction cylinder 40 (expansion of the expansion blade 20).

A cylinder mounting member 56 is provided at a central position in the plan view of the holding and fixing frame 26 of the holding and fixing device 25 (FIG. 4), and one end side (upper end side) 57 of the elevating cylinder 55 is attached to the cylinder mounting member 56. An attachment member 59 is provided on the other end side (lower end side) 58 of 55, and the attachment member 59 is attached to the vertically moving frame 30 (FIG. 2).
That is, the attachment member 59 is formed in the shape of a shaft with a horizontal axis, the intermediate portion of the attachment member 59 is attached to the other end side 58 of the elevating cylinder 55, and both ends of the attachment member 59 are attached to the vertical movement frame 30 side. (FIGS. 7 and 8).

When the elevating cylinder 55 is extended, the other end side 58 and the attachment member 59 are lowered with respect to the holding and fixing frame 26, whereby the vertically moving frame 30 is lowered, and when the vertically moving frame 30 is lowered, the vertically moving frame 30 is moved. As a result, the base of the expanding blade 20 is lowered and the lower end of the vertical excavation part 18 is lowered.
Then, when the extension amount of the expansion / contraction cylinder 40 and the extension amount of the elevating cylinder 55 are synchronized, the lower end of the vertical excavation portion 18 moves horizontally without moving in an arc around the mounting shaft 16, as described above. The cylindrical hole bottom surface 14C of the enlarged hole 14 is excavated substantially horizontally (in FIG. 9, a line L indicating the cylindrical hole bottom surface 14C is also shown above the vertical hole bottom surface 21 for easy understanding. Thus, the configuration is not limited.)
A swivel 63 is provided on the upper part of the holding and fixing frame 26 of the holding and fixing device 25, and a sheave block 64 is provided above the swivel 63 to hang a wire 12 hanging from the boom 11 of the base machine 10.
Therefore, the guide guide mechanism 28 for guiding the up and down movement frame 30 is provided between the holding and fixing frame 26 of the holding and fixing device 25 and the up and down movement frame 30.

As shown in FIGS. 7 and 8, a fixed-side cylindrical portion 66 that protrudes downward is provided on the lower surface of the center of the holding and fixing frame 26, and the upper end of the elevating cylinder 55 is axially formed on the fixed-side cylindrical portion 66. The cylinder mounting member 56 is inserted and mounted through a mounting hole (not shown). A fixed side frame 67 is fixedly attached to the upper part of the fixed side cylinder portion 66. Inside the cylindrical portion 68 of the fixed side frame 67, the cylindrical portion 70 of the moving side frame 69 is provided in a fitted state in which only the vertical movement is possible. At the center of the bottom plate 71 of the moving side frame 69, an intermediate portion of the moving side cylindrical portion 72 is provided in a fixed state, and the moving side cylindrical portion 72 is attached to the outer periphery of the fixed side cylindrical portion 66 so as to be vertically movable.
The upper part of the vertically moving frame 30 is fixedly attached to the bottom plate 71 of the moving side frame 69.

Either one of the cylindrical portion 68 of the fixed side frame 67 and the cylindrical portion 70 of the moving side frame 69 is provided with an engaging concave portion 73, and the other is an engaging convex portion that engages with the engaging concave portion 73. 74 is provided, and the movement of the moving side frame 69 is guided by the action of the engaging concave portion 73 and the engaging convex portion 74 and the fitting configuration of the fixed side cylindrical portion 66 and the bottom plate 71 and the cylindrical portion 68 and the cylindrical portion 70. (FIG. 13).
The upper part of the support member 75 is fixedly attached to the lower part of the fixed side cylinder part 66, and the attachment part 76 of the earth and sand receiver 49 is attached to the lower part of the support member 75.
Therefore, as shown in FIG. 8, the cylindrical portion 70 and the bottom plate 71 of the moving side frame 69 of the guide guide mechanism 28 are lowered with respect to the fixed-side cylindrical portion 66 and the support member 75, and are moved up and down by the lowering of the bottom plate 71. The frame 30 is lowered.

(Operation of the embodiment)
Since the present invention has the above-described configuration, the vertical hole 5 for vertical piles having a predetermined diameter and a predetermined depth is excavated in the ground W in advance by a casing rotary press-fitting device 1 and an excavating device (not shown) such as an earth drill.
Next, with the expansion blade 20 positioned in the retracted position in the vertical hole 5, the expansion excavator 15 is inserted with the expansion blade 20 closed and contracted,
The expansion excavator 15 is fixed and held on the casing K by the holding and fixing device 25 at a predetermined position.
In this state, the holding and fixing device 25 transmits the rotation of the casing K to the enlargement excavation device 15 to drive and rotate, while the expansion / contraction cylinder 40 is extended to expand the expansion blade 20 outside the outer diameter of the casing K. Then, the enlarged hole 14 is excavated.

  The expansion excavator 15 includes an expansion blade 20 that can be rotated by a mounting shaft 16 having a horizontal axis and that can move up and down in the depth direction of the vertical hole 5, and the expansion blade 20 is predetermined in the vertical direction. A plurality of excavating bodies 33 are arranged in parallel on the outer surface of the wing body 17 with a predetermined interval in the length direction, and a part of the excavating body 33 is expanded at least on the outer circumferential surface of the wing body 17 in the length direction. Since it is provided so as to protrude in the crossing direction with respect to the rotation axis of the excavator 15, the expansion blade 20 rotates in the crossing direction with respect to the rotation axis of the expansion excavator 15 at the horizontal axis of the mounting shaft 16. And the excavating body 33 projecting in the intersecting direction can increase the surface pressure of the cutting surface per unit area of the enlarged blade 20, enabling excavation of the hard ground, The range can be expanded.

In addition, a vertical excavation portion 18 for excavating a cylindrical enlarged cylindrical hole portion 14B in the lower portion of the enlarged hole 14 is rotated by a lower attachment shaft 43 below the wing body 17 of the enlarged wing 20 of the enlarged excavator 15. Since the angle adjustment cylinder 45 is provided between the vertical excavation part 18 and the blade body 17, the angle adjustment cylinder 45 can be expanded and contracted to expand the expansion blade according to the expansion diameter excavated by the expansion blade 20. An angle α between 20 and the vertical excavation part 18 is set.
Therefore, the angle α between the expansion blade 20 and the vertical excavation portion 18 can be set by extending and contracting the angle adjusting cylinder 45 according to the expansion diameter excavated by the expansion blade 20 without replacing parts as in the prior art. Can be improved.
That is, once the angle α between the expanding blade 20 and the vertical excavation part 18 is set by extending and contracting the angle adjustment cylinder 45, the vertical excavation part 18 moves as shown in “a” to “g” in FIG. Then, the cylindrical hole bottom surface 14C of the enlarged cylindrical hole portion 14B is excavated.

In this case, when the vertical excavating portion 18 is rotated about the center of the attachment shaft 16, the bottom surface 14 </ b> C of the cylindrical hole becomes an arc surface, but the height of the attachment shaft 16 is lowered according to the upward rotation amount of the expansion blade 20. Since the wing body 17 and the vertical excavation portion 18 of the enlarged wing 20 are rotated while being rotated upward about the center of the mounting shaft 16, the wing body 17 and the vertical excavation section 18 are simultaneously excavated. The excavation part 18 is moved down in synchronization with the rotation of the enlargement blade 20, and the enlargement excavation is performed so that the movement locus L along which the lower end of the vertical excavation part 18 moves is in a horizontal state.
Therefore, the vertical hole bottom surface 21 of the vertical hole 5 and the cylindrical hole bottom surface 14C of the enlarged cylindrical hole portion 14B are substantially horizontal, the lower surface of the enlarged portion can be horizontal, and the bottom surface of the enlarged portion has a stable shape.

Specifically, one end of the elevating cylinder 55 is attached to the holding and fixing frame 26 side of the holding and fixing device 25, and the lower end of the elevating cylinder 55 is attached to the vertical moving frame 30 side to which the attachment shaft 16 is attached. 40 and the elevating cylinder 55 are synchronized, and the elevating cylinder 55 is extended in accordance with the extension of the expansion / contraction cylinder 40 to lower the expansion blade 20 and the vertical excavation unit 18. Level.
Accordingly, the cylinder mounting member 56 is provided at the center position of the holding and fixing frame 26 of the holding and fixing device 25 in a plan view, and one end side (upper end side) 57 of the elevating cylinder 55 is attached to the cylinder mounting member 56. An attachment member 59 is provided on the other end side (lower end side) 58 of the lens, and the attachment member 59 is attached to the up and down moving frame 30. The attachment member 59 is formed in the shape of a shaft with a horizontal axis, and an intermediate portion of the attachment member 59 Is attached to the other end side 58 of the elevating cylinder 55, and both ends of the elevating cylinder 55 are attached to the vertical moving frame 30 side. Therefore, when the elevating cylinder 55 is extended, the vertical moving frame 30 is lowered by its own weight. The position of the mounting shaft 16 supported by the vertically moving frame 30 is lowered, and as a result, the base portion of the expanding blade 20 is lowered and the lower end of the vertical excavation portion 18 is lowered. That.

When the extension amount of the expansion / contraction cylinder 40 and the extension amount of the elevating cylinder 55 are synchronized, the lower end of the vertical excavation unit 18 moves horizontally without moving in an arc around the mounting shaft 16, and the vertical excavation unit 18. Excavates the cylindrical hole bottom surface 14C of the enlarged hole 14 substantially horizontally as shown in FIG.
When the expansion blade 20 excavates the expansion hole 14, the scraper 48 rakes the excavated earth and sand toward the center of the expansion excavator 15, and the collected earth and sand is collected in the earth and sand receiver 49.
When the sediment is collected in the sediment receiver 49, the expansion / contraction cylinder 40 and the lifting cylinder 55 are contracted to store the expansion blade 20, and in this state, the expansion excavator 15 is temporarily lifted from the vertical hole 5 and the sediment receiver 49 is retracted. The inside earth and sand is released by opening the opening / closing lid 50 of the earth and sand receptacle 49. When the inside of the earth and sand receptacle 49 becomes empty, the enlarged excavator 15 is inserted into the vertical hole 5 and the above operation is repeated.

  Therefore, the guide guide mechanism 28 for guiding the up and down movement of the vertical movement frame 30 is provided between the holding and fixing frame 26 of the holding and fixing device 25 and the vertical movement frame 30. A fixed-side cylinder portion 66 that protrudes downward is provided. A fixed-side frame body 67 is fixedly attached to an upper portion of the fixed-side cylinder portion 66, and a movable-side frame body 69 is provided inside the cylinder portion 68 of the fixed-side frame body 67. The cylinder part 70 of the moving side frame body 69 is fitted in a vertically movable manner, and the moving side cylinder part 72 provided in a fixed state is fitted in the center of the bottom plate 71 of the moving side frame body 69 to the outer periphery of the fixed side cylinder part 66 so as to freely move up and down. Since the upper part of the vertically moving frame 30 is fixedly attached to the bottom plate 71 of the moving side frame 69, the moving side frame 69 of the guide guide mechanism 28 is fixed to the fixed side cylindrical portion 66 and the support member 75. The cylindrical portion 70 and the bottom plate 71 are lowered, and the bottom plate 7 Moving frame 30 is lowered by the descent down.

In addition, an engagement recess 73 is provided in one of the tube portion 68 of the fixed-side frame 67 and the tube portion 70 of the moving-side frame 69, and the other is engaged with the engagement recess 73. Since each of the convex portions 74 is provided, the guide guide mechanism 28 has an action of the engaging concave portion 73 and the engaging convex portion 74 and a fitting configuration of the fixed side cylindrical portion 66 and the bottom plate 71 and the cylindrical portion 68 and the cylindrical portion 70. This guides the moving frame 69 to move up and down.
Note that the press-fitting of the casing K to the ground W by the casing rotary press-fitting device 1 and the expansion / contraction of the expansion / contraction cylinder 40 may be performed in synchronization with the expansion / contraction of the expansion blade 20 (moving frame 30) by the lift cylinder 55. .
Thus, when the expansion hole 14 is excavated by the expansion excavator 15, the hole wall measurement is performed after the primary hole bottom treatment, and then the treme tube is inserted and the secondary hole bottom treatment is performed after the rebar cage is installed. Do. Next, concrete is placed in the enlarged hole 14 and the vertical hole 5, and then the casing K is pulled out, and the pile driving operation is completed.

  DESCRIPTION OF SYMBOLS 1 ... Casing rotary press-fitting device, 5 ... Vertical hole, 10 ... Base machine, 11 ... Boom, 12 ... Wire, 14 ... Expansion hole, 15 ... Expansion excavation device, 16 ... Mounting shaft, 17 ... Wing body, 18 ... Vertical shape Excavation part, 20 ... magnifying wing, 25 ... holding and fixing device, 26 ... holding and fixing frame, 27 ... abutting body, 28 ... guide guide mechanism, 30 ... vertical movement frame, 31 ... plate member, 33 ... excavating body, 40 ... Expanding / contracting cylinder, 41 ... Mounting shaft, 43 ... Mounting shaft, 45 ... Angle adjustment cylinder, 46 ... Mounting portion, 48 ... Scraper, 49 ... Sediment receiver, 50 ... Opening / closing lid, 51 ... Operating lever, 55 ... Elevating cylinder, 56 ... Cylinder mounting member, 57 ... One end side, 58 ... Other end side, 59 ... Mounting member, 63 ... Swivel, 64 ... Sheave block, 66 ... Fixed side cylindrical part, 67 ... Fixed side frame, 68 ... Cylindrical part, 69 ... moving side frame, 70 ... cylinder , 71 ... bottom plate, 72 ... movable tubular portion, 73 ... engaging recess 74 ... engaging projection, 75 ... support member, 76 ... mounting portion.

Claims (7)

  A holding and fixing device 25 is provided in contact with the inner peripheral surface of the casing K to fix the entire device to the casing K. The holding and fixing frame 26 of the holding and fixing device 25 is movable up and down with respect to the holding and fixing frame 26. In addition, an expansion having a wing body 17 for excavating the slope 14A of the expansion hole 14 and a vertical excavation section 18 for excavating a cylindrical expansion cylinder hole portion 14B below the expansion hole 14 provided in the lower portion of the wing body 17. The wing 20 is provided, and the magnifying wing 20 is configured to excavate the magnifying hole 14 by rotating outwardly about the mounting shaft 16 of the horizontal axis, and the cylindrical hole of the magnifying cylindrical hole portion 14B of the magnifying hole 14. A cast-in-place pile expanding excavator configured to synchronize the outward rotation of the expanding blade 20 and the lowering of the expanding blade 20 so that the bottom surface 14C is in a horizontal state.   In claim 1, the expansion blade 20 is configured to rotate the expansion blade 20 about the mounting shaft 16 by the expansion / contraction cylinder 40 and to move up and down by the lift cylinder 55 with respect to the holding and fixing frame 26. An expansion excavation device for cast-in-place piles in which the expansion and contraction of the cylinder 40 and the expansion and contraction of the elevating cylinder 55 are synchronized.   In claim 2, an angle adjusting cylinder 45 for changing the angle of the vertical excavation unit 18 with respect to the wing body 17 is provided between the wing body 17 of the expansion wing 20 and the vertical excavation unit 18. When the inclined surface 14A of the enlarged hole 14 excavated by the wing body 17 has a predetermined excavation diameter, the side surface of the enlarged cylindrical hole portion 14B excavated by the vertical excavating section 18 is perpendicular to the ground. A cast-in-place pile expanding excavator in which an angle α with the cylindrical excavating portion 18 is preset by an angle adjusting cylinder 45.   The upper and lower moving frames 30 are attached to the holding and fixing frame 26 of the holding and fixing device 25 so as to be movable up and down with respect to the holding and fixing frame 26. An expansion excavator for cast-in-place piles in which an upper portion of the expansion wing 20 is rotatably attached to a frame 30 by an attachment shaft 16.   5. The cast-in-place pile expanding excavator according to claim 4, wherein a guide guide mechanism is provided between the holding and fixing frame of the holding and fixing device 25 and the vertically moving frame 30 to guide the up and down of the vertically moving frame 30. .   A vertical hole 5 having the same diameter as the casing K to be press-fitted into the ground W and having a predetermined depth is excavated in advance, and the horizontal axis core is attached so as to be positioned at a predetermined position above the enlarged cylindrical hole portion 14B of the vertical hole 5 An expansion excavation device 15 having an expansion blade 20 having a blade body 17 rotating around an axis 16 and a vertical excavation portion 18 is inserted, and the expansion excavation device 15 is casing C by a holding and fixing device 25 of the expansion excavation device 15. The rotation of the casing K driven and rotated by the casing rotary press-fitting device 1 is transmitted to the enlarged excavator 15 by the holding and fixing device 25 to be driven to rotate, and the enlarged blade 20 is rotated around the mounting shaft 16 while being driven to rotate. While rotating the horizontal axis to expand outside the outer diameter of the casing K, at the same time, the portion of the mounting shaft 16 is lowered with respect to the holding and fixing device 25, and the cylindrical hole bottom surface 14C of the expansion hole 14 is excavated in a horizontal state. You Expanded drilling method of cast-in-place pile.   In Claim 6, when the slope 14A of the expansion hole 14 excavated by the blade body 17 of the expansion wing 20 has a predetermined excavation diameter, the side surface of the expansion cylindrical hole portion 14B excavated by the vertical excavation unit 18 is perpendicular to the ground. In such a manner that the angle α between the wing body 17 and the vertical excavation part 18 is preset by the angle adjustment cylinder 45, the expansion excavator 15 is inserted into the vertical hole 5, and the holding and fixing frame 26 of the holding and fixing device 25 is obtained. The vertical movement frame 30 to which the mounting shaft 16 of the expansion blade 20 is attached is lowered by the lifting cylinder 55, and the downward movement of the vertical movement frame 30 by the lifting cylinder 55 and the expansion rotation of the expansion blade 20 by the expansion / contraction cylinder 40 are synchronized. Enlarged excavation method for cast-in-place piles to be drilled.

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