JP3525998B2 - Drilling stirrer and method of constructing composite pile using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavation and agitation device for agitating and mixing a solidifying material and excavated soil while expanding an excavation diameter from the midpoint of a target depth and constructing a composite pile using the same. It is about the method.

[0002]

2. Description of the Related Art A method of constructing a composite pile composed of a soil cement and a hollow pile such as a steel pipe pile has hitherto been a method of excavating the ground up to a supporting layer by an excavation stirrer while excavating a solidified material. After mixing and mixing the soil, the excavation and stirring device is pulled out and the hollow pile is inserted into the soil cement in which the excavated soil and the solidifying material are mixed. It consists of two steps of insertion.

On the other hand, the excavation and agitation device is projected from the lower end of the hollow pile, and the excavation and agitation device and the hollow pile are simultaneously lowered while excavating and agitating the ground by the excavation and agitation device. There is also a way to do it.

In this method, after the hollow pile is fixed to the support layer, the excavation stirring device is pulled out by colliding the excavation stirring device with the lower end of the hollow pile to close the excavation stirring blade. After closing the blade once, the excavation stirring blade cannot be opened again.Therefore, when there is hard soil before reaching the support layer, excavation of the hard soil by using the excavation stirring device and the hollow pile together. However, it is impossible to continue the excavation by projecting the excavation stirring device from the lower end of the hollow pile again and opening the excavation stirring blade.

In view of the above background, the present invention proposes an excavator and agitator capable of coping with the case where a hard ground exists before reaching the support layer or when the support layer is a hard ground, and a method of using the same. is there.

[0006]

According to a first aspect of the present invention, a sleeve is mounted on the outer periphery of a drill rod while being insulated from the rotation of the drill rod, and a drill stirring blade is rotatably connected to the outer periphery of the sleeve. By opening and closing the excavation stirring blade with the rotation of the, the excavation stirring blade can be freely opened and closed regardless of the relative position of the excavation stirring device and the hollow pile such as the steel pipe pile, and the intermediate layer and the support layer are hard ground. Also in this case, the excavation and stirring blade is expanded before reaching the support layer to enable excavation, stirring and mixing.

With respect to the excavating rod, the sleeve has a shaft opposite to the excavating rod due to the resistance of the soil received by the excavating stirring blade connected to the sleeve when the excavating rod rotates in either direction. When the excavating rod rotates in the opposite direction to the one direction and rotates in the opposite direction to the excavating rod, it rotates in the opposite direction to the excavating rod and engages the excavating rod.

[0008] the sleeve and drill rod is locked after a predetermined angular rotation in opposite directions to each other, for example respectively the engaged portion and the engagement with the inner periphery of the outer peripheral and the sleeve of the drill rod as claimed in claim 4 It is ensured by forming a part.

In this case, the engaging portion of the sleeve is formed at a position corresponding to the engaged portion of the excavating rod when the excavation stirring blade is closed and opened, and the engaging portion of the sleeve is engaged with the engaged portion. The digging rod rotates in the opposite direction to the rotation direction, and when the locking portion locks to the locked portion, the digging rod rotates in the same direction as the digging rod together with the digging rod.

The excavator blade is rotated around the sleeve with respect to the sleeve by rotating the excavator rod in one of the two directions. When the excavating rod rotates in the direction opposite to the one direction, it is closed by the resistance of the soil in the opposite direction to the rotation.

[0011] To remain excavation stirring blade is opened, the outer periphery of the drill rod, is ensured by the respective upper and lower sleeves to fix the upper stopper and a lower stopper.

In this case, the closed stirring blade can be locked downward by the lower stopper and upward by the upper stopper while opening when the drill rod rotates in either direction. When the excavating rod rotates in the direction opposite to the one direction, it separates from the lower stopper and closes.

In particular, when the distance between the edge of the lower stopper and the center of the drill rod is gradually shortened from the open position to the closed position of the drill stirring blade as described in claim 2 , Since the edge has a role of guiding the opening and closing of the excavation stirring blade, opening from the closed state and closing from the open state are smoothly performed.

Even when the upper surface of the lower stopper is inclined downward from the open position to the closed position of the excavating stirring blade as described in claim 3 , the upper surface of the lower stopper guides the opening and closing of the excavating stirring blade. to have a role, and freedom from similarly closed with claim 2, is smoothly closed from the open state.

In the second and third aspects of the invention, the lower stopper is formed in a shape where collision with the excavation stirring blade does not occur at the closed position of the excavation stirring blade.

In the second and third aspects, since the lower stopper guides the opening and closing of the excavating and stirring blade, the excavating and stirring blade in the closed state only receives the resistance of the soil in the direction opposite to the rotation of the excavating rod and together with the sleeve. It is opened while rotating with respect to the drilling rod, and the drilling stirring blade in the open state receives the resistance of the soil in the opposite direction to the rotation of the drilling rod and closes while rotating with the sleeve against the drilling rod. Therefore, the excavation stirring blade can be opened and closed only by the rotation of the excavation rod without ascending and descending the excavation rod.

In the first to fourth aspects, since the excavation stirring blade is switched between the open state and the closed state by rotating the excavation rod, the excavation stirring blade can be installed even when the excavation stirring device is stored inside the hollow pile. It is possible to return the hollow pile to the state of being projected from the lower end, and the excavation stirring blade can be freely opened and closed regardless of the relative position of the hollow pile.

Since the opening and closing of the excavation stirring blade allows the hard soil to exist before reaching the support layer, the excavation and stirring equipment is used together with the hollow pile to excavate the hard soil, and then the excavation stirring is performed. It is possible to continue the excavation, stirring, and mixing by projecting the entire device from the lower end of the hollow pile and opening the excavation stirring blade again.

A method of constructing a composite pile composed of soil cement and hollow piles by using the excavation and agitation device according to any one of claims 1 to 4 is a method according to claim 5 when the intermediate layer and the support layer are not hard ground. As described in 1, while the excavation stirring device is projected from the lower end of the hollow pile, the excavation stirring blade is opened by rotating the excavation rod in either direction,
While excavating the ground until the excavation stirrer reaches the support layer, stirs and mixes the excavated soil and the solidified material, rotates the excavation rod in the opposite direction to the one direction, and closes the excavation stirring blade to perform excavation. This is done by incorporating a stirring device inside the hollow pile and fixing the hollow pile to the tip of soil cement in which the excavated soil and the solidifying material are mixed.

When the intermediate layer and the support layer are hard ground, the excavation stirrer is projected from the lower end of the hollow pile and the excavation rod is rotated in either direction as described in claim 6. With the excavator blade open, stir and mix the excavated soil and the solidifying material while excavating the soil until the excavator mixer reaches the hard soil, and then rotate the excavating rod in the opposite direction to the one direction. Then, close the excavation stirring blade, and with the excavation stirring device incorporated inside the hollow pile,
Rotate the excavation stirrer and the hollow pile to excavate the hard ground until the excavation stirrer reaches the support layer, project the excavation stirrer from the lower end of the hollow pile again, and rotate the excavation rod in the one direction. With the excavation stirring blade open, the soil is excavated, the excavated soil and the solidifying material are stirred and mixed, and then the excavation rod is rotated in the opposite direction to close the excavation stirring blade to close the excavation stirring device to a hollow pile. It is carried out by incorporating the hollow pile into the inside of the soil and fixing it to the tip of soil cement in which excavated soil and solidifying material are mixed.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIGS. 1 and 2, an excavating and stirring apparatus 1 according to a first aspect of the present invention is mounted on an excavating rod 2 and on an outer periphery of the excavating rod 2 in a state insulated from rotation of the excavating rod 2. A sleeve 3 and a digging stirring blade 4 that is rotatably connected to the outer circumference of the sleeve 3 and that opens and closes as the digging rod 2 rotates.
Composed of.

An upper stopper 5 and a lower stopper 6 for restricting the vertical movement of the sleeve 3 with respect to the excavation rod 2 or for limiting the movement of the sleeve 3 with respect to the excavation rod 2 above or below the outer periphery of the excavation rod 2 are provided in a protruding manner. It Upper stopper 5
Also has a role of holding the excavation stirring blade 4 so as not to rotate further upward when the excavation stirring blade 4 changes from the closed state to the open state, and the lower stopper 6 prevents the opened excavation stirring blade 4 from rotating downward. It also has the function of holding it so that it does not close.

FIGS. 4 (a) and 4 (y) are sectional views taken along line xx of FIG. 3 showing the excavating rod 2 without the sleeve 3 attached.
As shown in FIG. 4- (b) which is a cross-sectional view taken along the line y, an engaged portion 21 is formed on the outer periphery of the excavating rod 2 for engaging the sleeve 3 when the excavating stirring blade 4 is closed and opened, or Is projected,
As shown in FIG. 5- (a), a locking portion that locks with the locked portion 21 at a position on the inner circumference of the sleeve 3 that corresponds to the locked portion 21 when the excavation stirring blade 4 is closed and opened. 31 is formed or projected.

In the drawings, as shown in FIGS. 6 and 8, the sleeve 3 rotates 90 ° around the axis of the excavating rod 2 so that the excavating stirring blade 4 is switched between the closed state and the open state. Although the locked portion 21 and the locking portion 31 are formed at two points of point symmetry, it is sufficient if both the locked portion 21 and the locking portion 31 are formed at at least one location.

Since the sleeve 3 is insulated from the rotation of the excavating rod 2, until the engaging portion 31 engages with the engaged portion 21 in the direction opposite to the rotating direction of the excavating rod 2 as shown in FIG. It rotates in the direction opposite to that of the excavating rod 2 and the locking portion 31 moves to the locked portion 21.
After being locked with the drill rod 2, it rotates in the same direction as the drill rod 2 together with the drill rod 2.

In the drawing, the drilling rod 2 is positive (clockwise)
When rotating, the locking portion 31 is locked to the locked portion 21 in the reverse rotation direction (counterclockwise) to open the excavation stirring blade 4, and when the drill rod 2 rotates in the reverse direction, the locking portion 31. Forms a locked portion 21 and a locking portion 31 so that the drilling stirring blade 4 is closed by locking the locked portion 21 in the direction of normal rotation, but when the drill rod 2 rotates in the reverse direction. The digging and stirring blade 4 is opened to the outside, and the digging and stirring blade 4 is closed at the time of normal rotation so that the engaged portion 21 and the engaging portion are closed.
31 may be formed.

In the drawings, as shown in FIGS. 3 and 4, between the upper stopper 5 and the lower stopper 6, the upper stopper 5 fixed afterwards to the excavation rod 2 after the sleeve 3 is mounted is preceded by the upper stopper 5. The holding material 7 that holds the space between the fixed lower stopper 6 is installed at two locations.
The holding member 7 also functions in place of the locked portion 21 of the excavating rod 2 or together with the locked portion 21 after rotating the sleeve 3 with respect to the excavating rod 2 by a certain angle and then stopping. When the holding material 7 has a role of replacing the locked portion 21 of the excavating rod 2, it is not necessary to form the locked portion 21 of the drilling rod 2 and the locking portion 31 of the sleeve 3.

The excavation and stirring blade 4 is rotatably connected by a pin 8 to a plate 32 integrated with the outer periphery of the sleeve 3 about an axis that is horizontal or that is inclined to some degree with respect to the horizontal. Since the excavation stirring blade 4 is connected to the sleeve 3, in the case of the drawing, when the excavation rod 2 is rotated in the forward direction, as shown in FIGS.
Is opened by the reverse resistance of the soil as shown by the solid line, and is closed by the reverse resistance of the soil when the excavating rod 2 is rotated in the reverse direction as shown by the chain line.

As shown in FIGS. 1 and 2, the excavating stirring blade 4 has upper and lower surfaces inclined with respect to the horizontal, so that the excavating rod 2 has a resistance to soil in the reverse direction when the excavating rod 2 rotates in the forward direction, and also the excavating rod. Two
The soil resistance in the forward direction when the excavating rod 2 rotates backwards and from the closed state due to the resistance of the upward soil when the excavating rod descends, and the downward soil when the excavating rod 2 rises. The resistance changes from the open state to the closed state.

From this fact, the excavation stirring blade 4 which is closed by the downward movement of the excavation rod 2 is surely opened, and the excavation stirring blade 4 which is opened by being raised while being rotated in the reverse direction is opened. Will be surely closed.

When the excavation and stirring blade 4 is opened, as shown in FIG.
As shown in (c), the engagement portion 31 of the sleeve 3 has the engaging portion 31
While being locked to the locked portion 21 in the reverse rotation direction, the excavation stirring blade 4 can be locked downward to the lower stopper 6 and can be locked upward to the upper stopper 5, thereby Keep open.

When the excavation and stirring blade 4 is closed, as shown in FIG.
As shown in (a), the excavation stirring blade 4 is disengaged from the lower stopper 6, and the locking portion 31 of the sleeve 3 is the locked portion of the drilling rod 2.
The excavation stirring blade 4 is maintained in a closed state by being locked in the direction of normal rotation at 21.

The excavation stirring blade 4 is released from the closed state,
Although not shown, maintaining the open state and, conversely, closing the open state and maintaining the closed state also allow the outer peripheral surface of the pin 8 penetrating the excavation stirring blade 4 and the pin 8 to penetrate therethrough. Each of the drilling rods 2 is attached to the inner peripheral surface of the insertion hole.
It is also ensured by forming a locked portion and a locked portion such as the locked portion 21 and the locking portion 31 of the sleeve 3.

In this case, when the excavating and stirring blade 4 is opened, the engaging portion of the insertion hole is engaged with the engaged portion of the pin 8 formed at that position in the opening direction, and the excavating and stirring apparatus 1 is By continuing to descend, the excavation stirring blade 4 maintains an open state, and when the excavation stirring blade 4 is closed, the locking portion of the insertion hole is closed to the locked portion of the pin 8 formed at that position. , And the excavation and agitation device 1 keeps rising to maintain the closed state.

FIG. 6- (a) shows a state when the excavation stirring blade 4 connected to the sleeve 3 is closed, and (b) shows a state when the excavation stirring blade 4 is opened. 7- (a) to (c) show an example of the lower stopper 6 integrated with the excavation rod 2.

The lower stopper 6 is formed by notching the closed position of the excavating stirring blade 4 as shown in FIGS. 7 (a) and 7 (c), or as shown in FIG. 7 (b).
The distance between the edge of the drilling rod and the center of the drilling rod 2 is
Of the drill stirring blade 4 at the closed position of the drill stirring blade 4 by gradually shortening from the open position to the closed position of the drill stirring blade 4.
The shape does not cause collision with.

Further, as shown in FIGS. 7- (a) and 7- (b), the distance between the edge of the lower stopper 6 and the center of the excavating rod 2 gradually decreases from the open position of the excavating stirring blade 4 to the closed position. In the case of the shape, the lower stopper 6 has a function of smoothly opening the excavation stirring blade 4 from the closed state along the edge of the lower stopper 6 and from the opened state.

FIG. 8 shows a combination of the excavating stirring blade 4 and the excavating rod 2 when the sleeve 3 having the excavating stirring blade 4 shown in FIG. 6 and the excavating rod 2 having the lower stopper 6 shown in FIG. 7- (a) are combined. The relationship between the lower stopper 6 and the lower stopper 6 is shown.

FIG. 8- (a) shows a state in which the excavating rod 2 is rotating in the reverse direction. In this state, as described above, the excavating stirring blade 4 receives the resistance of the soil in the direction of normal rotation and is separated from the lower stopper 6 to rotate together with the sleeve 3, so that the locking portion 31 of the sleeve 3 is locked. By locking in the direction of normal rotation, the excavation stirring blade 4 is maintained in a closed state.

The excavating rod 2 shown in FIGS. 1 and 2 excavates and stirs while descending while rotating forward, and reversely rotating when ascending. Therefore, when the excavating rod 2 is reversely rotating,
The excavating stirring blade 4 is maintained in the closed state by receiving the downward soil resistance.

FIG. 8- (b) shows a state when the excavating rod 2 is started to rotate forward. In this state, the excavation stirring blade 4 receives the resistance of the soil in the reverse rotation direction, so that the locking portion 31 is disengaged from the locked portion 21, and the excavation stirring blade 4 rotates with the sleeve 3 while the lower stopper 6 is rotated. It is opened by being guided to the edge of. Since the excavation rod 2 descends during forward rotation, the excavation stirring blade 4 is also opened by receiving upward soil resistance.

As shown in (c), when the excavating and stirring blade 4 is completely opened and the engaging portion 31 is engaged with the engaged portion 21 in the reverse rotation direction, the sleeve 3 rotates together with the excavating rod 2. The excavation and stirring blade 4 excavates, stirs, and mixes. In the state of (c), the excavation stirring blade 4 can be locked downward by the lower stopper 6 and upwardly locked by the upper stopper 5, thereby maintaining the open state. The excavation stirring blade 4 is also maintained in an open state by receiving the resistance of upward soil due to the descending of the excavation rod 2.

9- (a) to (c) show the case where the excavating stirring blade 4 of FIG. 6 is combined with the excavating rod 2 having the lower stopper 6 shown in FIG. 7- (b). (c) shows the transition from reverse rotation of the drilling rod 2 to forward rotation when the drilling stirring blade 4 of FIG. 6 is combined with the drilling rod 2 with the lower stopper 6 shown in FIG. 7- (c). Indicates.

11 and 12 show that the upper surface of the lower stopper 6 is tilted downward from the open position to the closed position of the excavation stirring blade 4, so that the upper surface of the lower stopper 6 opens and closes the excavation stirring blade 4. Is shown to guide the user to smoothly perform the opening from the closed state and the closing from the open state. Here, by making the lower stopper 6 absent at the closed position of the excavation stirring blade 4,
The collision between the excavating stirring blade 4 and the lower stopper 6 does not occur at the closed position.

FIG. 13 shows soil cement 9 and hollow piles 10 such as steel pipe piles and hollow concrete piles using the excavator and agitator 1.
The construction procedure of the method of constructing the composite pile 11 consisting of is shown. Figure
13 shows an example in which the intermediate layer and the support layer are not hard ground.

The excavator agitator 1 is connected to a rod 12 whose upper end is connected to a drive motor, the hollow stakes 10 are connected to the same or different drive motors, or alternatively they are not connected to a drive motor and simply suspended. Can be lowered. When the hollow pile 10 is connected to the drive motor to which the rod 12 is connected, the hollow pile 10 rotates together with the rod 12 in the same direction, and when it is connected to another drive motor, the hollow pile 10 does not rotate or the rod It can be rotated in the opposite direction to 12. If not connected to the drive motor, the hollow pile 10 will not rotate.

As shown in FIG. 13- (a), the excavation agitator 1 projects from the lower end of the hollow pile 10 and is connected to the lower end of the excavation rod 2 in one direction, in the case of normal rotation in the drawing. Excavating the ground by the open bit 13 and the open excavating and stirring blade 4, and at the same time, excavating and stirring the solidified material and excavated soil discharged from the ground through the excavation rod 2 or supplied into the ground through a pipe or the like. Stir and mix with. Figure
14 is an enlarged view of FIG. 13- (a).

Until the bit 13 reaches the target support layer 14, a low-concentration (poor mixture) peripheral fixative is used as the solidifying material, and from the front side of the support layer 14 as shown in (b). The solidifying material is switched to a high-concentration (rich mixture) root-hardening liquid, and while stirring the support layer 14 as it is, stirring and mixing it, the pile tip 15
To build.

Before the soil cement 9 consisting of the excavated soil and the solidified material at the pile tip portion 15 is hardened, the excavation and agitation device 1 and the hollow pile 10 are once pulled up as shown in (c). At this time, the excavation stirring device 1 is pulled up while rotating in the reverse direction, and the excavation stirring blade 4 is closed.

Thereafter, as shown in (d), the excavation and agitation device 1 is taken into the hollow pile 10 while the excavation and agitation blade 4 is closed, and the hollow pile 10 is attached to the pile tip portion 15 as shown in (e). The construction is completed by press-fitting the inside and pulling up the excavation and agitation device 1.

FIG. 15 shows a construction procedure for constructing the composite pile 11 in the case where the hard layer 17 exists in the intermediate layer before reaching the support layer 14. In this case, as shown in FIG. 16 which is an enlarged view of FIG. 15- (c), a claw 16 is projected from the lower end of the hollow pile 10.

Until the bit 13 reaches the hard layer 17 (a)
As shown in Fig. 13, when the bit 13 reaches the hard layer 17, as shown in (b), the excavation and agitation device 1 is rotated in the reverse direction to move up and into the hollow pile 10. Store.

In this state, as shown in (c), the excavating and agitating device 1 and the hollow pile 10 are rotated, and the bit 13 and the claws 16 of the hollow pile 10 excavate the ground until the hard layer 17 is penetrated. Hollow pile
The rotation of 10 may be in the same direction as the rotation of the excavator and agitator 1 or in the opposite direction.

After penetrating the hard layer 17, as shown in (d), the excavator and agitator 1 and the hollow pile 10 are pulled up to the upper layer of the hard layer 17,
As in (a), the excavation and agitation device 1 is again projected from the lower end of the hollow pile 10, and the excavation rod 2 is rotated forward to open the excavation and agitation blade 4, and the bit 13 and the excavation and agitation are set as shown in (e). While excavating the ground to the support layer 14 with the blade 4, the solidified material and the excavated soil are stirred and mixed by the excavation stirring blade 4.

Thereafter, the process is carried out by the steps shown in FIGS. 13- (c) to (e).

When the support layer 14 is the hard layer 17, FIG.
-Constructed in the same way as the steps shown in (a) to (e).

[0057]

According to the first aspect of the present invention, the sleeve is attached to the outer periphery of the drill rod in a state of being insulated from the rotation of the drill rod, and the excavator stirring blade is rotatably connected to the outer periphery of the sleeve so as to excavate with the rotation of the drill rod. To open and close the stirring blade, regardless of the relative position of the excavation stirring device and the hollow pile,
Opening and closing of the excavation stirring blade is free, and even when the intermediate layer and the support layer are hard ground, excavating the hard ground together with the hollow pile, and then projecting the entire excavation stirring device from the lower end of the hollow pile, Opening the excavation and stirring blade again, excavation and stirring,
Mixing can be done.

Further, in the first and the fourth aspects, the sleeve rotates with respect to the excavating rod by a certain angle in the direction opposite to the direction of rotation of the excavating rod to engage with the excavating rod, and the excavating stirring blade with respect to the sleeve, Since the excavation rod rotates in accordance with the rotation of the excavation rod and switches between opening and closing, it is possible to maintain the closed state and the open state of the excavation stirring blade only by changing the direction of rotation of the excavation rod.

According to the first aspect of the present invention, by fixing the upper stopper and the lower stopper to the upper and lower portions of the sleeve on the outer circumference of the drill rod, respectively, so that the lower stopper and the upper stopper can be locked when the drill stirring blade is opened, It is possible to reliably hold the state in which the excavating stirring blade is open.

According to a second aspect of the present invention , in the first aspect , the distance between the edge of the lower stopper and the center of the excavating rod is gradually shortened from the open position to the closed position of the excavating stirring blade, whereby the edge of the lower stopper is changed. Since the opening and closing of the excavating and stirring blade is guided, opening and closing from the closed state can be smoothly performed.

[0061] In claim 3, claim 1, by inclining downwardly over the upper surface of the lower stopper from the open position of the drilling stirring blade to the closed position, in order to guide the opening and closing of the drilling stirring blade by the upper surface of the lower stopper As in the second aspect , the opening from the closed state and the closing from the open state can be smoothly performed.

In the second and third aspects, since the lower stopper guides the opening and closing of the excavating stirring blade, the excavating stirring blade can be opened and closed only by rotating the excavating rod without ascending and descending the excavating rod.

[Brief description of drawings]

FIG. 1 is an elevational view showing a digging and stirring device.

FIG. 2 is a side view of FIG.

FIG. 3 is an elevational view showing a drilling rod.

4A is a cross-sectional view taken along line xx of FIG. 3, and FIG. 4B is y of FIG.
It is a y-line sectional view.

5A is a plan view showing a sleeve, and FIG. 5B is an elevation view of FIG.

FIG. 6 (a) is a plan view showing a closed state of the excavating stirring blade,
(b) is a plan view showing an open state of the excavating stirring blade.

7 (a) to 7 (c) are plan views showing a lower stopper fixed to a drill rod.

8 (a) to (c) are plan views showing the relationship between the excavation stirring blade and the lower stopper shown in FIG. 7- (a) from the closed state until the excavation stirring blade is opened.

9 (a) to (c) are plan views showing the relationship between the excavation stirring blade and the lower stopper shown in FIG. 7- (b) from when the excavation stirring blade is closed to when it is opened.

10 (a) to 10 (c) are plan views showing the relationship between the excavation stirring blade and the lower stopper shown in FIG. 7- (c) from when the excavation stirring blade is closed to when it is opened.

FIG. 11 is a perspective view showing a state where a lower stopper having an upper surface inclined is fixed to the excavating rod.

FIG. 12 is a perspective view showing the relationship between the lower stopper and the excavation stirring blade shown in FIG. 11.

13 (a) to 13 (e) are elevation views showing a construction procedure when a hard layer does not exist up to a support layer.

FIG. 14 is an enlarged view of FIG. 13- (a).

15 (a) to (e) are elevation views showing a construction procedure in the case where a hard layer exists up to the support layer.

FIG. 16 is an enlarged view of FIG. 15- (c).

[Explanation of symbols]

1 ... Drilling stirring device, 2 ... Drilling rod, 21 ... Locked part, 3 ... Sleeve, 31 ... Locking part, 32 ... Plate,
4 ... Excavating stirring blade, 5 ... Upper stopper, 6 ... Lower stopper, 7 ... Holding material, 8 ... Pin, 9 ... Soil cement, 10 ... Hollow pile, 11 ... Synthetic pile, 12 ... … Rod, 13
…… Bit, 14 …… Support layer, 15 …… Pile tip, 16 ……
Nail, 17 ... hard layer.

Claims (6)

(57) [Claims] 1. A drill rod, a sleeve mounted on the outer periphery of the drill rod in a state of being insulated from the rotation of the drill rod, and a drill that is rotatably connected to the outer periphery of the sleeve and that opens and closes as the drill rod rotates. Comprised of a stirring blade, the sleeve engages with the drilling rod by rotating the drilling rod in either direction to rotate in a direction opposite to the drilling rod by a certain angle around the axis of the drilling rod. , When the excavating rod rotates in the direction opposite to the one direction, it rotates in the opposite direction to the excavating rod by a certain angle to engage with the excavating rod, and the excavator stirring blade rotates the excavating rod in either direction. When the drilling rod rotates in the opposite direction to the one direction, it closes, and when the drilling rod rotates in the opposite direction to the one direction, it closes on the outer circumference of the drilling rod and above and below the sleeve, respectively.
The upper stopper and the lower stopper are fixed, and the excavation stirring blade
Opens when the drill rod rotates in either direction.
If it is possible to lock the lower stopper downward while releasing it,
In addition, the upper stopper can be locked upward,
When the switch rotates in the direction opposite to the one direction described above,
An excavator and agitator that separates from the topper and closes . 2. The distance between the edge of the lower stopper and the center of the drilling rod is gradually reduced from the open position of the drilling stirring blade to the closed position, and the lower stopper is connected to the drilling stirring blade at the closed position of the drilling stirring blade. Claims that are shaped so that collisions do not occur
The excavation and agitation device according to 1 . 3. The upper surface of the lower stopper is inclined downward from the open position to the closed position of the excavating stirring blade, and the lower stopper is shaped so as not to collide with the excavating stirring blade at the closed position of the excavating stirring blade. The excavating and stirring device according to claim 1 . 4. An engaged portion is formed on the outer periphery of the excavating rod, with which the sleeve is engaged when the excavating stirring blade is closed and opened.
The excavating and stirring apparatus according to claim 1, wherein an engaging portion that engages with the engaged portion when the excavating and stirring blade is closed and opened is formed on the inner circumference of the sleeve. 5. A method for constructing a composite pile composed of soil cement and a hollow pile by using the drilling and stirring apparatus according to any one of claims 1 to 4 , wherein the drilling and stirring apparatus is projected from the lower end of the hollow pile. While rotating the drill rod in either direction to open the drill stirring blade,
While excavating the ground until the excavation stirrer reaches the support layer, stirs and mixes the excavated soil and the solidified material, rotates the excavation rod in the opposite direction to the one direction, and closes the excavation stirring blade to perform excavation. A method for constructing a synthetic pile in which a stirrer is incorporated into a hollow pile and the hollow pile is fixed to the tip of soil cement in which excavated soil and solidifying material are mixed. 6. A method for constructing a composite pile composed of soil cement and a hollow pile by using the drilling and stirring apparatus according to any one of claims 1 to 4 , wherein the drilling and stirring apparatus is projected from the lower end of the hollow pile. While rotating the drill rod in either direction to open the drill stirring blade,
While excavating the ground until the excavation and agitation device reaches the hard ground, agitating and mixing the excavated soil and the solidified material, then rotating the excavation rod in the opposite direction to the one direction to close the excavation agitation blade, and excavation. With the stirrer inside the hollow pile, rotate the excavator and the hollow pile to excavate the hard ground until the excavator reaches the support layer, and project the excavator again from the lower end of the hollow pile. In addition, while the excavating rod is rotated in the one direction to open the excavating stirring blade, the excavated soil and the solidifying material are stirred and mixed while excavating the ground, and then the excavating rod is rotated in the opposite direction, Close the excavation stirring blade and incorporate the excavation stirring device inside the hollow pile,
A method for constructing a composite pile in which a hollow pile is fixed to the tip of soil cement in which excavated soil and solidifying material are mixed.