JP2002180454A - Excavating and stirring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evenly distribute a solidifying material from an outer circumferential position of an excavation rod to a hole wall vicinity and provide effective stirring and mixing of excavated soil and the solidifying material inside the hole wall in a method of stirring and mixing the excavated soil and the solidifying material discharged from a tip of the excavation rod while excavating the ground. SOLUTION: A plurality of discharge holes 5a-7a are formed in the tip of the excavation rod 2 and distances from a center on a cross section of the excavation rod 2 to a tip of each discharge hole 5a-7a are respectively differentiated. Or, a plurality of discharge holes 5a-7a are formed in the tip of the excavation rod 2, a supply pipe supplying the solidifying material to the discharge holes 5a-7a is separated into an inner pipe 8a and an outer pipe 8b of a double pipe structure, and cross-sectional areas of the inner and outer pipes 8a and 8b are mutually differentiated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling and stirring device for stirring and mixing a solidified material discharged from the tip of a drilling rod and excavated soil while excavating the ground.

[0002]

2. Description of the Related Art In a method of excavating the ground and stirring and mixing the solidified material and excavated soil by rotation of a drilling stirring blade and a drilling rod having a stirring blade, a method of rotating the drilling rod from the center of the drilling rod is known. A soil cement with a radius equal to the distance to the tip of the excavating stirring blade or the stirring blade is constructed, but the discharge hole for discharging the solidified material is usually formed at the tip of the drilling rod. It is difficult to spread the solidified material discharged from the discharge hole evenly from the outer peripheral position of the excavation rod to the vicinity of the hole wall even in the radial direction of.

[0003] It is conceivable to form a discharge hole through the inside of the drilling rod up to the drilling stirring blade or the stirring blade, or to attach the discharge hole to the drilling stirring blade or the stirring blade. If there is no discharge hole at a position farther away, the excavated soil and the solidified material cannot be effectively agitated, so that it cannot always be said to be a reasonable method.

When a composite pile is constructed by lowering a drilling rod together with a hollow pile such as a steel pipe pile and a hollow concrete pile and fixing the hollow pile in soil cement, the drilling rod is fixed inside the hollow pile after the hollow pile is fixed. The drilling and stirring blades and the stirring blades need to be able to be closed from an open state.

In order to support the drilling stirring blade and the stirring blade so that the drilling rod can be opened and closed, it is necessary to connect the drilling stirring blade and the stirring blade to the drilling rod so as to be rotatable around a horizontal axis or the like. When the discharge hole is formed in the stirring blade or the like, the portion where the inside of the drilling rod communicates with the discharge hole is separated when the drilling stirring blade or the like is opened and closed when the drilling stirring blade or the like is open. It becomes difficult to maintain a state in which the inside of the excavation rod communicates with the discharge hole.

In view of the above background, the present invention proposes an excavating and stirring device capable of discharging a solidified material rationally when the solidified material is discharged from the excavation.

[0007]

According to a first aspect of the present invention, a plurality of discharge holes are formed in the tip of the drill rod, the discharge holes being provided inside the drill rod and communicating with a supply pipe for supplying the solidified material to the tip of the drill rod. By differentiating the distance from the center on the cross section of the drilling rod to the tip of each discharge hole, the region where the solidified material discharged from each discharge hole reaches is divided,
The entire discharge hole covers the region from the vicinity of the drilling rod to the region near the hole wall, and enables effective mixing and mixing of the excavated soil and the solidified material in the hole wall.

The distance from the center of the cross section of the drilling rod to the tip of each discharge hole has a plurality of discharge holes having discharge holes communicating with the supply pipe and having different lengths from each other. The difference is made by connecting the nozzle to the tip of the drill rod.

The solidification material is supplied to each discharge nozzle from a single supply pipe, and is supplied from a supply pipe separated for each discharge hole. When the supply pipe is separated for each discharge hole, the supply pipe is separated into an inner pipe and an outer pipe having a double-pipe structure as described in claim 4, and the inner pipe and the outer pipe are separated into any one of the discharge holes. If the solidified material is supplied from the same position and at the same pressure by changing the cross-sectional area of the inner tube and the outer tube, the pressure at the time of discharging the solidified material can be discharged. Since it is possible to control each hole and discharge the solidified material from the discharge hole that covers the area near the hole wall at a high pressure, the length of the discharge nozzle that has the discharge hole that covers the area near the hole wall can be controlled. It is not necessary to increase the size.

In the case where the supply pipe has a double pipe structure, the supply positions of the solidified material to the inner pipe and the outer pipe are made different from each other as described in claim 6. The supply pressure of the solidified material supplied to the inner pipe and the outer pipe by supplying the solidified material from the center of the cross section of the drilling rod to the outer pipe and supplying the solidified material to the outer pipe from the outer circumference of the drilling rod And the concentration of the solidifying material can be changed.

In the case where the solidified material is supplied to the outer tube from the outer periphery of the drilling rod, the portion of the drilling rod that supplies the solidified material to the outer tube may be provided from the outer tube to the outer periphery of the drilling rod. A communicating supply path is formed, and on the outer periphery of that part,
A cover member that has a flow path that is continuous with the supply path in the circumferential direction while communicating with the supply path, and that rotates together with the drilling rod is mounted.

Since the supply of the solidified material from the outer periphery of the drill rod needs to be insulated from the rotation of the drill rod, the outer periphery of the cover material is rotatable relative to the drill rod, and the flow of the cover material is controlled. A supply boss having a supply port communicating with the road is mounted, and the solidified material is supplied from the supply port of the supply boss.

The feed boss is independent of the rotation of the drill rod,
Although the stationary state is maintained, since the flow path of the cover material is continuous in the circumferential direction, the supply port of the supply boss always communicates with the flow path, and the solidified material because the flow path communicates with the supply path of the drilling rod. It is injected into the outer tube from the supply port through the flow path of the cover material and the supply path of the drill rod, and is sent to the discharge hole.

When the composite pile is constructed by lowering the excavating and stirring device together with the hollow pile and fixing the hollow pile in soil cement, the excavating and stirring device is pulled out through the hollow pile after the hollow pile is fixed. The outer periphery of the digging rod as described in claim 9, with respect to the digging rod, so that the digging stirring blade and the stirring blade can both be closed from the open state.
The sleeve is rotatably connected to a sleeve that is rotatably mounted at least in one direction about the axis and relatively rotatable. The sleeve is openable and closeable when the sleeve rotates at a certain angle with respect to the drilling rod.

In this case, when the drilling and stirring device is pulled out, for example, the drilling rod is rotated in the reverse direction from the normal rotation during excavation, and resistance is given to the drilling and stirring blade and the stirring blade from soil or soil cement, or the drilling rod is rotated in the reverse direction. The excavation stirring blade and the stirring blade are made to collide with the lower end of the hollow pile while being made to close the excavation stirring blade and the stirring blade.

In the ninth aspect of the present invention, the sleeve is rotatably mounted on the excavating rod in any direction relative to the excavating rod, and the excavating stirring blade and the agitating blade are attached to the sleeve with respect to the excavating rod. In the case where it is freely openable from the closed state when rotating at a certain angle in one of the directions, and it is freely openable from the open state when rotating at a certain angle in the other direction, the excavation stirring blade and the excavation stirring blade by reverse rotation of the excavation rod The agitating blade will be closed by resistance from soil or soil cement.

In this case, the sleeve is freely rotatable in any direction, and the excavation stirring blade and the stirring blade are opened and closed by the rotation of the excavation rod. In order to maintain the open state by this and close by reverse rotation, once the drilling and stirring device is once taken into the hollow pile during the excavation of the drilling rod, the drilling and stirring device is again projected from the hollow pile and excavated and stirred. The blade and the stirring blade can be opened.

Therefore, when the hard ground is present before reaching the support layer, the ground is excavated by the excavating and stirring device up to the hard ground, and when the hard ground is reached,
The drilling / stirring device is pulled into the hollow pile, and after excavating the hard ground by using the bit at the tip of the drilling / stirring device and the claw attached to the tip of the hollow pile, the drilling / stirring device is again projected from the tip of the hollow pile to excavate and stir. Excavation, agitation, and mixing can be continued by the excavation and agitation device until the blade and the agitation blade are opened and the support layer is reached.

[0019]

DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 2, the invention of claim 1 comprises a drilling rod 2, and drilling and stirring blades 3 and 4 protruding from the outer periphery of the drilling rod 2, as shown in FIG. Discharge holes 5a, 6a, 7a for discharging the solidified material supplied through the inside of the drilling rod 2 to the tip of the drilling rod 2 as described above.
And each discharge hole 5a,
The excavating and stirring device 1 has different distances to the tips of 6a and 7a.

A supply pipe 8 for supplying a solidified material from the upper end to the tip of the drill rod 2 is arranged inside the drill rod 2, and a discharge hole 6 a communicating with the supply pipe 8 is provided at the tip of the drill rod 2, for example. The discharge holes 6a and 7a are formed by connecting the discharge nozzles 6 and 7 having the discharge nozzles 6 and 7a.

As shown in FIGS. 2 and 3, the distal end of the excavating rod 2 is connected to a joint 2B, which is a part of the excavating rod 2 and has a distal bit 9 protruding therefrom. 7 is connected to the joint 2B. Although not shown, the distal end portion of the supply pipe 8 may be branched into a plurality of tubes without connecting the discharge nozzles 6 and 7, and the distal end may be fixed to the joint portion 2B as the discharge holes 6a and 7a.

When the discharge nozzles 6 and 7 are connected to the excavating rod 2, the supply pipe 8 is continuously arranged up to the discharge path 2a formed inside the joint 2B, and the discharge nozzles 6 and 7 are connected through the discharge path 2a. It communicates with the tip of the supply pipe 8. In the drawing, a discharge hole 5a is formed at the lower end on the center line of the joint 2B, and two discharge nozzles 6, 7 having different lengths are connected to the joint 2B so as to be horizontal.

In this case, the distance from the center of the cross section of the excavating rod 2 to the tip of each of the discharge holes 6a, 7a is determined by the distance of each of the discharge nozzles 6,
The length of the discharge nozzle 6 differs from the length of the discharge nozzle 6 when the solidified material is discharged to the excavation ground. 7 shares the area far from the drill rod 2.
The discharge hole 5a at the lower end of the joint portion 2B shares a portion directly below the excavation rod 2.

The two discharge nozzles 6 and 7 are connected to a joint 2
In the case of connection to B, the discharge nozzles 6, 7 are arranged such that the discharge holes 6a, 7a of the respective discharge nozzles 6, 7 are opposite to each other as shown in FIG. When three or more are connected, they are arranged radially with respect to the center of the joint 2B. In the drawing, the discharge nozzles 6 and 7 are both arranged horizontally,
In some cases, the discharge holes 6a and 7a are arranged so as to face downward or upward from the horizontal.

The solidified material is supplied to each of the discharge holes 5a, 6a, 7a through a single supply pipe 8, or through supply pipes 8, 8 separated from each other. FIGS. 1 and 5 show a case where the supply pipe 8 is separated from each other and a case where the solidified material is supplied through a supply pipe 8 composed of an inner pipe 8a and an outer pipe 8b having a double pipe structure. Here, the inner pipe 8a is connected to the discharge hole at the lower end of the joint 2B.
5a is communicated with the discharge hole 7a of the discharge nozzle 7 having a large length,
The outer tube 8b communicates with the discharge hole 6a of the discharge nozzle 6 having a small length.

As shown in FIGS. 1 and 5, the sectional area of the inner tube 8a is
When the cross section is smaller than 8b (cross section of inner tube 8a / outer tube
When the solidified material is supplied at the same pressure from the same position at the upper end of the inner tube 8a and the outer tube 8b,
The pressure of the solidified material discharged from the discharge holes 5a and 7a communicating with the inner tube 8a becomes higher than the pressure of the solidified material discharged from the discharge holes 6a connected to the outer tube 8b.

Accordingly, of the discharge holes 6a, 7a of the discharge nozzles 6, 7 horizontally connected to the joint 2B, the solidified material discharged from the discharge hole 7a communicating with the inner tube 8a is discharged to the outer tube 8b. Since it is possible to reach a region farther than the solidified material discharged from the hole 6a, the solidified material discharged from the discharge holes 6a and 7a located at the same level can be uniformly distributed in the hole wall as shown in FIG. It is not necessary to make the length of the discharge nozzle 7 serving the area far from the excavation rod 2 extremely larger than the length of the discharge nozzle 6 serving the area near the excavation rod 2.

Since the lengths of the discharge nozzles 6 and 7 do not necessarily need to be different from each other, the discharge nozzles 6 and 7 having different lengths are connected to the joint 2B in FIGS. , 7 may be used as the discharge holes 6a, 7a. The case where the cross-sectional area of the outer pipe 8b is different from the cross-sectional area of the inner pipe 8a corresponds to the invention of claim 5.

When the supply pipe 8 has a double pipe structure, the outer pipe 8b has a hollow portion formed at the center of the joints 2A and 2B at the upper end and lower end of the drill rod 2 so as to be continuously formed in the axial direction. And the pipe inserted into the cavity is the inner pipe 8a
Becomes

In the drawing, the joint 2 of the drill rod 2 is shown.
In the section excluding A and 2B, a small-diameter pipe serving as the inner pipe 8a is inserted through a large-diameter pipe serving as the outer pipe 8b, but the section excluding the joints 2A and 2B is also connected to the joints 2A and 2B. A similar structure may be used.

FIGS. 1 to 3 show the case where the solidified material is supplied to the inner pipe 8a and the outer pipe 8b from the same position at the upper end of the joint 2A. FIGS. 4 to 6 show the case where the solidified material is supplied to the inner pipe 8a. A case is shown in which the supply is performed from the upper end of the joint 2A and the supply to the outer tube 8b can be selectively performed from either the upper end of the joint 2A or the outer periphery of the excavating rod 2. The case where the supply of the solidified material to the outer pipe 8b is performed from the outer periphery of the drilling rod 2 corresponds to the invention of claim 7.

In each of FIGS. 1 to 3 and FIGS. 4 to 6, as described above, one discharge nozzle 6 having a small length is connected to the outer tube 8b, and a length of the discharge nozzle 6 is connected to the inner tube 8a. Large discharge nozzle 7
And the inner pipe 8a communicates with a discharge hole 5a formed at the lower end of the joint 2B.

The solidified material supplied to the inner pipe 8a is discharged downward from the discharge hole 5a at the lower end of the joint portion 2B, reaches the region below the tip bit 9, and has a long discharge nozzle 7
From the discharge hole 7a, and reaches a region far from the drilling rod 2. The solidified material supplied to the outer pipe 8b is discharged from the discharge hole 6a of the discharge nozzle 6 having a small length, and reaches a region around the excavation rod 2.

In the case of FIGS. 4 to 6 in which the supply of the solidified material to the outer pipe 8b can be performed from the outer periphery of the drill rod 2, FIG.
The joint member 10 shown in FIG. 4 is connected to the joint 2A at the upper end of the drill rod 2 shown in FIG.

The joint member 10 is located at the uppermost position,
An upper attachment 10A having the same structure as the joint 2A of the excavating rod 2, and a lower attachment 10C located at the lowest position and connected to the joint 2A as shown in FIG.
And an intermediate attachment 10B which is sandwiched between the two attachments 10A and 10C and connected to both. The lower attachment 10C is connected to the joint 2A to form a part of the excavating rod 2.

A hollow outer tube 10b is formed continuously from the upper end of the upper attachment 10A to the connection portion of the lower attachment 10C with the joint 2A, and the inner tube 10a is inserted into the outer tube 10b, as shown in FIG. As shown joint member 10
When the joint 2A is connected to the
The inner pipe 10a of 10 communicates with the inner pipe 8a of the joint 2A, and the outer pipe 10b communicates with the outer pipe 8b.

The supply of the solidified material to the outer pipe 10b is performed by using the drill rod 2
4, the outer tube 10b is attached to the intermediate attachment 10B from the outer tube 10b as shown in FIG.
A supply path 10c communicating with the outer periphery of B in the radial direction or the like is formed.

The outer periphery of the intermediate part attachment 10B has a flow path 11a which is continuous with the supply path 10c and is continuous in the circumferential direction.
The cover member 11 that rotates together with the cover member 11 is mounted. A supply port 12a which is rotatable relative to the drill rod 2 on the outer periphery of the cover member 11 and communicates with the flow path 11a of the cover member 11 in a radial direction or the like.
Is mounted.

The supply boss 12 is mounted around the cover member 11 via the bearing 13, so that it is insulated from the rotation of the intermediate attachment 10 B and the cover member 11 which rotate together with the drill rod 2, and the rotation of the drill rod 2. Regardless, keep the stationary state.

The solidified material is supplied to the supply port 12a through the socket 14, and the solidified material is injected into the outer tube 10b through the flow path 11a of the cover material 11 and the supply passage 10c of the intermediate part attachment 10B, and further through the outer tube 8b. It is discharged from the discharge hole 6a. Inner tube
The solidified material supplied from the upper end of the inner pipe 10a flows from the inner pipe 10a to the inner pipe 8a.
Is discharged from the discharge holes 5a and 7a at the lower end of the joint 2B.

FIG. 2 shows that the excavating and stirring device 1 is lowered together with the hollow pile 27 such as a steel pipe pile or a hollow concrete pile as shown in FIG.
An example of protruding the excavating and stirring blades 3 and the stirring blades 4 from the excavating rod 2 according to the construction method for constructing No. 28 is shown.

In the case of constructing the composite pile 28, the excavating and stirring device 1 is set after the hollow pile 27 is settled, as shown in FIG.
27, since the drilling and stirring blades 3 and 4 are pulled out through the interior, at least one of the drilling rod 2 and the drilling rod 2 is disposed around the axis of the drilling rod 2 so that the blades can be closed from an open state. Is rotatably connected to a sleeve 15 which is rotatably mounted at a fixed angle relative to the direction of the excavation rod. Drill rod 2
At the upper and lower positions of the sleeve 15, an upper plate 18 for restraining the vertical movement of the sleeve 15 with respect to the drill rod 2 is set.
And the lower plate 19 are fixed.

FIG. 2 shows an example of the configuration of the digging / stirring apparatus 1 according to the ninth aspect of the present invention, in which the digging / stirring blades 3 and 4 are kept open during excavation and do not return to the open state after closing. When the drilling / stirring device 1 is pulled out through the inside of the hollow pile 27, the drilling rod 2 is rotated in the direction opposite to the direction of excavation, and the drilling / stirring blade 3 and the stirring blade 4 respectively collide with the lower end of the hollow pile 27 while rotating the drilling rod 2 in the reverse direction. The drilling and stirring blade 3
Then, the stirring blade 4 is closed.

The excavating and stirring blades 3 and 4 are rotatably supported by pins 17 on brackets 16 and 16 fixed in parallel with the sleeve 15 around a horizontal axis or an axis inclined to some extent with respect to the horizontal. As shown in FIG. 2, in the open state, it is located between the upper plate 18 and the lower plate 19.

The brackets 16 for the excavating stirring blades 3 and the stirring blades 4,
The portion sandwiched between 16 has a cylindrical shape, or a block shape in which two corners of a prism are chamfered in an arc shape, and a plate-like blade is welded to the block-like portion to form a drilling and stirring blade 3. And the stirring blade 4 are formed.

The excavating and stirring blades 3 and 4 are connected to the upper plate 18.
Stopper 2 fixed to the lower surface of the
The pin is sandwiched between 0 and 20 and penetrates at least one of the stoppers 20 to maintain the open state by the split pins 21 that reach the excavating and stirring blades 3 and the stirring blades 4. Split pin
Numeral 21 breaks due to the impact force at the time of collision of the excavating and stirring blades 3 and the stirring blades 4 with the hollow pile 27.

The stoppers 20 are paired with the excavating and stirring blade 3
In the open state of the stirring blade 4, the upward and downward rotation is restricted. In FIG. 2, the upper stopper 20 is formed in a shape that matches the block-like portion sandwiched between the brackets 16 and 16 of the excavating and stirring blades 3 and 4 and the plate-like portion protruding from the upper plate 18. .

The upper plate 18 and the lower plate 19 are
When the excavating stirring blade 3 or the stirring blade 4 tries to rotate around the pin 17, the stopper 20 can exert a restraining effect,
Alternatively, the cotter pin 21 breaks when the lower plate 19 collides with the hollow pile 27 of the excavating stirring blade 3 or the stirring blade 4, and the sleeve 15 rotates at a certain angle with respect to the drill rod 2. A notch 19a is formed so that the excavating stirring blade 3 and the stirring blade 4 rotate around the pin 17 and hang down.

The excavating and stirring blades 3 and 4 keep the open state by the split pin 21 while the excavating rod 2 rotates forward and excavate, and after the hollow pile 27 is fixed, the excavating rod 2 rotates in reverse. Meanwhile, when the excavating and stirring device 1 is pulled out and each of the excavating and stirring blades 3 and 4 collides with the lower end of the hollow pile 27, the split pin 21 is broken, and the excavating and stirring blade 3 and the stirring blade 4 are connected. The sleeve 15 rotates in the opposite direction to the rotation of the drilling rod 2 due to the resistance received from the soil or soil cement 26, and the drilling stirring blades 3 and the stirring blades 4 are notched in the lower plate 19.
When rotated until it conforms to 19a, it rotates around pin 17 and hangs down to close.

In FIG. 2, the excavated soil and the solidified material are effectively stirred and mixed with the solidified material without being stirred with the solidified material in a state where the viscous excavated soil is in a lump. The earth pressure plates 22, 22 having a length longer than the length of the excavating and stirring blades 3 and capable of penetrating into the hole wall, are provided in two vertical stages.

The earth pressure plate 22 is also protruded from the sleeve 15 insulated from the drilling rod 2 like the drilling and stirring blades 3 and 4, but here, the earth pressure plate 22 is closed only by collision with the hollow pile 27. Thus, the earth pressure plate 22 is fixed to the bracket 16 by the horizontal split pins 21.

The sleeve 15 on which the earth pressure plate 22 is supported does not have the upper plate 18 and the lower plate 19, but a stopper 20 is protruded from the upper end of the sleeve 15 so as not to rotate upward when the earth pressure plate 22 is open. You. The earth pressure plate 22 collides with the lower end of the hollow pile, and when the split pin 21 breaks, it can rotate downward around the pin 17 and hangs down to close.

FIGS. 7 to 14 show an example of the construction of the digging / stirring apparatus 1 according to the tenth aspect, in which the digging / stirring blades 3 and 4 are kept open during excavation and return to the open state after closing.
In this case, the sleeve 15 is mounted so as to be rotatable relative to the excavation rod 2 in any direction relative to the excavation rod 2, and the excavation stirring blade 3 and the agitation blade 4 move in one of the directions of the sleeve 15 with respect to the excavation rod 2. Can be freely opened from the closed state at the time of rotation at a certain angle, and can be freely closed from the open state at the time of rotation at a certain angle in the other direction.

The upper plate 18 includes the excavating and stirring blades 3 and the stirring blades 4.
The lower plate 19 has a function of holding the upper excavating blade 3 and the lower stirring plate 4 not rotating downward when the open state is changed from the closed state to the opened state. It has a role to keep it from being done.

FIGS. 9A and 9B are sectional views taken along the line xx of FIG. 8 showing the excavating rod 2 without the sleeve 15 attached.
As shown in FIG. 9- (b) which is a sectional view taken along the line y, a locked portion 23 to which the sleeve 15 is locked when the excavation stirring blade 3 or the stirring blade 4 is closed and opened is provided on the outer periphery of the drilling rod 2. As shown in FIG. 10- (a), an inner periphery of the sleeve 15 is located at a position corresponding to the locked portion 23 when the excavating and stirring blades 3 and 4 are closed and opened. Locking part 24 that locks to locked part 23
Are formed or protruded.

In the drawing, as shown in FIGS.
The rotation of the excavating rod 15 by 90 ° about the axis of the excavating rod 2 switches the closed state and the open state of the excavating and stirring blades 3 and 4 from the closed state and the opened state. Are formed at two points symmetrical with respect to the point, but it is sufficient that both are formed at least at one point.

Since the sleeve 15 is insulated from the rotation of the excavating rod 2, as shown in FIG. 12, until the locking portion 24 is locked to the locked portion 23 in a direction opposite to the rotation direction of the excavating rod 2. It rotates in the opposite direction to the excavation rod 2 and the locking portion 24
, And rotates together with the drilling rod 2 in the same direction as the drilling rod 2.

In the drawing, the drill rod 2 is positive (clockwise)
When the locking portion 24 is locked to the locked portion 23 in the reverse rotation direction (counterclockwise) when rotating, the excavation stirring blade 3 and the stirring blade 4 are opened, and the drilling rod 2 rotates reversely. The locked part 23 and the locking part 24 are formed so that the locking part 24 is locked to the locked part 23 in the forward rotation direction, and the excavation stirring blade 3 and the stirring blade 4 are closed. In some cases, the locked part 23 and the locking part 24 are formed so that the drilling and stirring blades 3 and 4 are opened when the drilling rod 2 rotates in the reverse direction and closed when the drilling rod 2 rotates forward.

In the drawings, as shown in FIGS. 8 and 9, between the upper plate 18 and the lower plate 19, the upper plate 18 which is fixed to the excavating rod 2 after the sleeve 15 is mounted after the upper plate 18, A holding member 25 for maintaining a space between the lower plate 19 and the fixed lower plate 19 is provided at two places.

The holding member 25 is also used for the locked portion of the drill rod 2.
Instead of, or together with the locked portion 23, the sleeve 15 rotates the fixed angle with respect to the excavating rod 2 and then stops. The retaining material 25 is the locked portion 23 of the drill rod 2
It is not always necessary to form the locked portion 23 of the excavating rod 2 and the locking portion 24 of the sleeve 15 in the case of having the function of

The excavating and stirring blades 3 and the stirring blades 4 are, as in the case of FIG.
16 is connected to a pin 16 by a pin 17 so as to be rotatable about an axis that is horizontal or inclined to some extent with respect to the horizontal.

The excavating and stirring blades 3 and 4 are connected to the sleeve 15 so that, in the case of the drawing, when the drilling rod 2 rotates forward, the resistance of the soil and the soil cement 26 in the opposite direction as shown by the solid line in FIG. , And is closed by reverse resistance of the soil and soil cement 26 when the drill rod 2 rotates in the reverse direction, as shown by the dashed line.

As shown in FIGS. 2 and 7, the excavating and stirring blades 3 and 4 have their upper and lower surfaces inclined with respect to the horizontal plane, so that the resistance of the excavating rod 2 to reverse rotation when the rotating rod 2 rotates forward. In addition to the above, when the drilling rod 2 descends, the state of the drilling rod 2 is changed from the closed state to the open state due to resistance of upward soil, etc.
Is changed from the open state to the closed state due to the resistance of the soil or the like in the forward rotation direction when is rotated in the reverse direction and the resistance of the downward soil or the like when the excavating rod 2 rises.

When the drilling stirring blades 3 and 4 receive resistance from two directions, the drilling rod 2 descends while rotating forward, thereby opening the closed drilling stirring blades 3 and stirring blades 4. The rising of the excavation stirring blade 3 and the stirring blade 4 that are open by the ascending while rotating in the reverse direction is surely performed.

When the excavating and stirring blades 3 and 4 are opened, the locking portion 24 of the sleeve 15 is rotated in the direction opposite to the locked portion 23 of the drilling rod 2 as shown in FIG. While being locked, the excavation stirring blades 3 and the stirring blades 4 are locked downward on the lower plate 19 and can be locked upward on the upper plate 18, so that the excavation stirring blades 3 and the stirring blades 4 are opened. maintain.

When the excavating and stirring blades 3 and 4 are closed, the excavating and stirring blades 3 and the stirring blades 4 separate from the lower plate 19 as shown in FIG. Locks the locked portion 23 of the excavating rod 2 in the forward rotation direction, so that the excavating and stirring blades 3 and 4 are kept closed.

It is not shown that the excavating and stirring blades 3 and 4 are opened from the closed state and kept open, and conversely, from the opened state and closed and kept closed, it is not shown. The engaged portion 23 of the excavating rod 2 and the engaging portion 24 of the sleeve 15 are respectively provided on the outer peripheral surface of the pin 17 penetrating the excavating and stirring blades 3 and 4 and the inner peripheral surface of the insertion hole through which the pin 17 penetrates. It is also ensured by forming a locked portion and a locking portion as described above.

In this case, when the excavating and stirring blades 3 and the stirring blades 4 are opened, the locking portions of the insertion holes are locked to the locked portions of the pins 17 formed at the positions in the opening direction, so that the excavation and stirring are performed. As the stirring device 1 continues to descend, the excavating stirring blades 3 and the stirring blades 4 maintain an open state, and when the excavating stirring blades 3 and the stirring blades 4 are closed, the locking portions of the insertion holes are formed at the positions. The pin 17 is locked to the locked portion in the closing direction, and the closed state is maintained by the excavating and stirring device 1 continuing to rise.

FIG. 11- (a) shows the state when the excavating and stirring blades 3 and 4 connected to the sleeve 15 are closed, and FIG. 11 (b) shows the state when the excavating and stirring blades 3 and 4 are opened. . Fig. 13- (a) ~
(c) shows an example of the shape of the lower plate 19 integrated with the excavation rod 2.

The lower plate 19 is formed by cutting out the closed position of the excavating and stirring blades 3 and 4 as shown in FIGS. 13 (a) and 13 (c), or as shown in FIG. 13 (b). The distance between the edge of the lower plate 19 and the center of the drilling rod 2 is gradually reduced from the open position to the closed position of the drilling and stirring blades 3 and 4 so that the drilling and stirring blades 3 and the stirring At the closed position of the blade 4, collision with the excavating and stirring blade 3 and the stirring blade 4 does not occur.

As shown in FIGS. 13 (a) and 13 (b), the lower plate 19
The distance between the edge of the drill and the center of the drill rod 2 is
When the lower plate 19 is gradually shortened from the open position to the closed position of the stirring blade 4, the lower plate 19 smoothly opens the excavating stirring blade 3 and the stirring blade 4 from the closed state along the edge of the lower plate 19, In addition, it has a function to smoothly close from the open state.

FIG. 12 shows the excavating and stirring blades 3 and 4 shown in FIG.
When the excavation stirring blade 3 is combined with the excavation rod 2 having the lower plate 19 shown in FIG.
The relation between the excavating rod 2 and the lower plate 19 is shown in FIG.

FIG. 12- (a) shows a state where the excavating rod 2 is rotating in the reverse direction. In this state, as described above, the excavating and stirring blades 3 and the stirring blades 4 are separated from the lower plate 19 and rotate together with the sleeve 15 by receiving resistance of soil or the like in the forward rotation direction, and the locking portion 24 of the sleeve 15 is moved. By locking to the locked portion 23 in the forward rotation direction, the excavating and stirring blades 3 and the stirring blades 4 are kept closed.

The excavating rod 2 shown in FIG. 7 excavates and agitates when descending while rotating forward, and reversely rotates when ascending. Therefore, when the excavating rod 2 is rotating reversely, the excavating and stirring blades 3 and the stirring blades are rotated. 4 maintains a closed state by receiving resistance such as downward soil.

FIG. 12- (b) shows a state when the excavating rod 2 starts to rotate forward. In this state, the excavating and stirring blades 3 and 4 receive resistance of soil or the like in the direction of reverse rotation, so that the locking portion 24 is detached from the locked portion 23, and the excavating and stirring blades 3 and 4 are sleeved. While being rotated with 15, the lower plate 19 is opened by being guided by the edge thereof. Since the excavating rod 2 descends during the forward rotation, the excavating and stirring blades 3 and 4 are also opened by receiving resistance such as upward soil.

As shown in (c), the excavating and stirring blades 3 and the stirring blades 4
Is completely opened, and the locking part 24 is rotated in the reverse direction.
The sleeve 15 rotates together with the excavating rod 2 so that excavation, agitation and mixing by the excavating and stirring blades 3 and 4 are performed. In the state (c), the excavating and stirring blades 3 and the stirring blades 4 can be locked to the lower plate 19 downward and can be locked to the upper plate 18 upward to maintain the open state. The excavating and stirring blades 3 and the stirring blades 4 maintain the open state by receiving resistance of upward soil or the like due to the descent of the drilling rod 2.

FIGS. 14A and 14B show that the upper surface of the lower plate 19 is inclined downward from the open position to the closed position of the excavating and stirring blades 3 and 4 so that the upper surface of the lower plate 19 is lowered. The opening and closing of the excavating and stirring blades 3 and the stirring blades 4 in contact therewith is guided so that the opening from the closed state and the closing from the open state are smoothly performed.

Here, the lower plate 19 is absent at the closed position of the excavating and stirring blades 3 and 4 so that the excavating and stirring blades 3 and the stirring plate 4 and the lower plate are located at the closed positions of the excavating and stirring blades 3 and 4. 19 collisions are prevented.

FIG. 15 shows an example of a soil cement 26 and a hollow pile 27 such as a steel pipe pile or a hollow concrete pile using the excavating and stirring device 1.
The construction procedure of a method for constructing a composite pile 28 made of: Figure
Reference numeral 15 denotes an example where the intermediate layer and the support layer 30 are not hard ground.

The excavating rod 2 of the excavating and stirring device 1 is connected to a rod 29 whose upper end is connected to a driving motor, and the hollow pile 27 is connected to the same or another driving motor, or not connected to a driving motor. Simply suspended.

The hollow pile 27 is connected to the drive motor to which the rod 29 is connected.
Is connected, the hollow pile 27 rotates in the same direction with the rod 29, and when connected to another drive motor, the hollow pile 27
27 does not rotate or is rotated in the opposite direction to rod 29. When not connected to the drive motor, the hollow pile 27 does not rotate.

The excavating and stirring device 1 protrudes from the lower end of the hollow pile 27 as shown in FIG. 15- (a), and is connected to the lower end of the excavating rod 2 in one direction, in the state shown in FIG. The ground is excavated by the tip bit 9 and the open excavation stirring blade 3, and at the same time, the solidified material and excavated soil discharged from the ground through the excavation rod 2 are agitated and mixed by the excavation stirring blade 3 and the stirring blade 4. FIG. 16 is an enlarged view of FIG. 15- (a).

Immediately before the tip bit 9 reaches the target support layer 30, a low-concentration (poorly mixed) peripheral fixative is used as the solidifying material, and as shown in FIG. The solidified material is switched to a high-concentration (rich blending) root compaction liquid, and is stirred and mixed while excavating the support layer 30 to construct a root compaction part 31.

Prior to the hardening of the soil cement 26 made of excavated soil and solidified material in the root consolidation section 31, the excavating and stirring device 1 and the hollow pile 27 are once pulled up as shown in FIG. At this time, the excavating and stirring device 1 is pulled up while rotating in the reverse direction, and the excavating and stirring blades 3 and the stirring blades 4 are closed.

Thereafter, as shown in (d), while the excavating and stirring blades 3 and 4 are closed, the excavating and stirring device 1 is moved to the hollow pile 27.
Then, as shown in (e), the hollow pile 27 is press-fitted into the bolster 31 and the excavating and stirring device 1 is pulled up to complete the construction.

FIG. 17 shows a construction procedure for constructing the composite pile 28 when the hard layer 32 is present in the intermediate layer before reaching the support layer 30. In this case, as shown in FIG. 18 which is an enlarged view of FIG.
A claw 27a for excavating a hole is protruded.

Until the tip bit 9 reaches the hard layer 32
As shown in (a), the operation is performed in the same manner as in FIG. 15, and when the tip bit 9 reaches the hard layer 32, as shown in (b), the excavating / stirring device 1 is raised while rotating in the reverse direction to form a hollow. Store in pile 27.

In this state, the excavating and stirring device 1 and the hollow pile 27 are rotated as shown in FIG.
The ground is excavated until the hard layer 32 is penetrated by 27a.
The rotation of the hollow pile 27 may be in the same direction as the rotation of the excavating and stirring device 1 or may be in the opposite direction.

After the penetration of the hard layer 32, the excavating and stirring device 1 and the hollow pile 27 are pulled up to the upper layer of the hard layer 32 as shown in FIG.
The excavating and stirring device 1 is again protruded from the lower end of the hollow pile 27 as in (a), and the excavating rod 2 is rotated forward to open the excavating and stirring blades 3 and 4 as shown in (e). While excavating the ground to the support layer 30 with the bit 9 and the excavating stirring blade 3, the solidified material and the excavated soil are stirred and mixed by the excavating stirring blade 3 and the stirring blade 4.

Thereafter, the steps are carried out according to the steps shown in FIGS. 15 (c) to 15 (e). When the support layer 30 is the hard layer 32,
It is constructed in the same manner as the steps shown in FIGS. 17- (a) to (e).

[0091]

According to the first to third aspects of the present invention, a plurality of discharge holes are formed at the distal end of the drilling rod, and the distances from the center on the cross section of the drilling rod to the distal ends of the discharge holes are made different. The area where the solidified material discharged from each discharge hole reaches is divided, and all discharge holes cover the area from near the drilling rod to the area near the hole wall. Materials can be stirred and mixed.

In the fourth aspect, the supply pipe for supplying the solidified material to the tip of the drilling rod has a double pipe structure of an inner pipe and an outer pipe.
The pressure at the time of discharging the solidified material can be controlled for each discharge hole.

According to a fifth aspect of the present invention, the supply pipe has a double pipe structure of an inner pipe and an outer pipe, and the cross-sectional area of the inner pipe and the outer pipe is changed. And the length of the discharge nozzle having the discharge hole covering the area near the hole wall does not necessarily have to be increased.

In the sixth to eighth aspects, when the supply pipe has a double pipe structure, the positions of supply of the solidified material to the inner pipe and the outer pipe constituting the supply pipe are different, so that the inner pipe and the outer pipe are different. It is possible to change the supply pressure of the solidified material supplied to each of them, the concentration of the solidified material, and the like.

According to a ninth aspect of the present invention, the excavating stirring blade and the stirring blade are rotatably connected to the outer periphery of the excavating rod and to a sleeve rotatably mounted at a fixed angle relative to the excavating rod in at least one direction. In order to be able to close from the open state by allowing the sleeve to rotate freely at a certain angle of rotation with respect to the drilling rod, the drilling and stirring device is lowered together with the hollow pile, and the hollow pile is anchored in the soil cement and the composite pile is fixed. When constructing the structure, it is possible to cope with the construction in which the excavating and stirring device is pulled out through the hollow pile after the fixing of the hollow pile.

According to the tenth aspect, the sleeve is rotatably mounted on the excavating rod in any direction relative to a fixed angle, and the excavating stirring blade and the agitating blade are rotatably connected to the sleeve. In order to open freely when rotating at a certain angle in one of the directions and close freely when rotating at a certain angle in the other direction, the excavation stirring device is temporarily placed in the hollow pile during the excavation of the drill rod. After taking in, let the excavator and stirrer project from the hollow pile again,
The excavating stirring blade and the stirring blade can be opened.

For this reason, in the case where the hard ground exists before reaching the support layer, the ground is excavated by the excavation / stirring device just before the hard ground, and when the hard ground is reached, the excavation / stirring device is hollowed out. After pulling into the pile and excavating the hard ground by using the excavator and stirrer together with the hollow pile, the excavator and stirrer are protruded from the tip of the hollow pile again, and the excavator and stirrer and the stirrer are opened to excavate until they reach the support layer. Excavation can be continued by the stirring device.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a drilling rod of a drilling and stirring apparatus according to claim 4, wherein the supply pipe has a double pipe structure of an inner pipe and an outer pipe, and supplies a solidified material to the inner pipe and the outer pipe from the same position. is there.

FIG. 2 is an elevational view showing a digging and stirring device according to a ninth embodiment in which a digging stirring blade and a stirring blade are protruded from the drilling rod of FIG. 1;

3 (a) is a side view of the distal end portion of FIG. 2, and FIG. 3 (b) is a bottom view of FIG. 2 (a).

FIG. 4 is a longitudinal sectional view showing a joint member which is a part of the drilling and stirring device according to claim 8, wherein a solidified material is supplied to the inner pipe from the center of the cross section of the drill rod and to the outer pipe from the outer circumference of the drill rod. It is.

FIG. 5 is a vertical sectional view showing a drill rod connected to the joint member of FIG. 4;

FIG. 6 is a longitudinal sectional view showing a state where the joint member of FIG. 4 is connected to the excavation rod of FIG. 5;

FIG. 7 is an elevational view showing a digging and stirring device according to claim 10;

FIG. 8 is an elevational view showing a digging rod of the digging and stirring device of FIG. 7;

9A is a sectional view taken along line xx of FIG. 8, and FIG. 9B is a sectional view taken along line yy of FIG.

10A is a plan view showing a sleeve of the excavating and stirring device shown in FIG. 8, and FIG. 10B is an elevation view of FIG.

11 (a) is a plan view showing a closed state of the excavating and stirring blades and stirring blades supported by the sleeve of FIG. 10, and FIG. 11 (b) is a plan view showing an open state of the excavating and stirring blades and stirring blades. is there.

FIGS. 12 (a) to 12 (c) show the excavating and stirring blades and the stirring blades from the state in which they are closed to the time when they are opened.
FIG. 4A is a plan view showing the relationship with the lower plate of FIG.

FIGS. 13A to 13C are plan views showing examples of the shape of a lower plate fixed to a drill rod.

14A is a perspective view showing a state in which a lower plate having an inclined upper surface is fixed to a drilling rod, and FIG. 14B is a perspective view showing a state in which the drilling rod of FIG. It is the perspective view which showed the mode that it was mounted.

FIGS. 15 (a) to (e) are elevation views showing a construction procedure of a composite pile in a case where a hard layer does not exist up to a support layer.

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

17 (a) to (e) are elevation views showing a construction procedure of a composite pile in a case where a hard layer exists up to a support layer.

FIG. 18 is an enlarged view of FIG. 15- (d).

[Explanation of symbols]

1 ... Drilling stirrer, 2 ... Drilling rod, 2A, 2B ...
... Joint section, 2a ... Discharge path, 3 ... Drilling stirring blade, 4
... stirring blades, 5a, 6a, 7a ... discharge holes, 6, 7 ... nozzles, 8 ... supply pipes, 8a ... inner pipe, 8b ... outer pipe, 9 ... tip bit, 10 ... joint Member, 10A: upper attachment, 10B: middle attachment, 10C: lower attachment, 10a: inner pipe, 10b: outer pipe, 10c
... supply path, 11 ... cover material, 11a ... flow path, 12 ... supply boss, 12a ... supply port, 13 ... bearing, 14 ... socket, 15 ... sleeve, 16 ... bracket, 17 ...... Pin, 18 ... Top plate, 19 ... Bottom plate, 19a ...
... Notch, 20 ... Stopper, 21 ... Split pin, 22 ... Earth pressure plate, 23 ... Locked part, 24 ... Locked part, 25 ... Retaining material, 26
…… Soil cement, 27 …… Hollow pile, 27a …… Claw, 28…
... Synthetic pile, 29 ... Rod, 30 ... Support layer, 31 ... Rooted part, 32 ... Hard layer.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Atsushi Kobayashi 2-9-8 Nihonbashi-Horidome-cho, Chuo-ku, Tokyo Inside Daisho Shinki Co., Ltd. (72) Inventor Masakazu Tanigawa 8-14 Ginza, Chuo-ku, Tokyo No. 14 Nippon Special Construction Co., Ltd. (72) Inventor Tomonori Osaki 8-14-14 Ginza, Chuo-ku, Tokyo F-term (reference) 2D040 AB05 AB14 BA08 BD05 DA01 DA03 DA11 DA16 DB07 EA11 EA17 EA18

Claims (10)

[Claims] 1. A drilling rod, a drilling stirring blade protruding from an outer periphery of the drilling rod, and a stirring blade, and a supply pipe for supplying a solidifying material to a tip end of the drilling rod is disposed inside the drilling rod, A drilling / stirring device in which a discharge hole communicating with a supply pipe is formed at a distal end of a drilling rod, a plurality of discharge holes are provided, and a distance from a center on a cross section of the drilling rod to a distal end of each discharge hole is different. Drilling stirrer. 2. The excavating and stirring apparatus according to claim 1, further comprising a discharge hole communicating with the supply pipe, wherein a plurality of discharge nozzles having different lengths are connected to the tip of the drill rod. 3. The excavating and stirring device according to claim 1, wherein the supply pipe is separated for each discharge hole. 4. The excavating and stirring apparatus according to claim 3, wherein the supply pipe is separated into an inner pipe and an outer pipe having a double pipe structure, and the inner pipe and the outer pipe communicate with one of the discharge holes. 5. A drilling rod, a drilling stirring blade protruding from the outer periphery of the drilling rod, and a stirring blade, and a supply pipe for supplying a solidified material to the tip of the drilling rod is disposed inside the drilling rod, A drilling / stirring device in which a discharge hole communicating with the supply pipe is formed at the tip of the drill rod, there are a plurality of discharge holes, and the supply pipe is separated into an inner pipe and an outer pipe having a double pipe structure. The outer pipes communicate with one of the discharge holes, respectively.
A drilling and stirring device in which the cross-sectional area of the inner pipe and the cross-sectional area of the outer pipe are different from each other. 6. The excavating and stirring apparatus according to claim 4, wherein the supply positions of the solidified material to the inner pipe and the outer pipe are different. 7. The excavating and stirring apparatus according to claim 6, wherein the solidified material is supplied to the inner pipe from a central portion on the cross section of the drilling rod, and the solidified material is supplied to the outer pipe from the outer periphery of the drilling rod. 8. A supply path communicating from the outer pipe to the outer periphery of the drilling rod is formed in a portion of the drilling rod for supplying the solidified material to the outer pipe, and the outer periphery of the part is formed in a circumferential direction while communicating with the supply path. A cover material that rotates with the drilling rod is mounted, and a supply port that is rotatable relative to the drilling rod and communicates with the flow path of the cover material is provided on the outer periphery of the cover material. The excavating and stirring device according to claim 7, further comprising a supply boss. 9. The drilling and stirring blade and the stirring blade are rotatably connected to a sleeve rotatably mounted on the outer periphery of the drilling rod so as to be rotatable relative to the drilling rod in a fixed angle in at least one direction. The excavating and stirring apparatus according to any one of claims 1 to 8, wherein the excavating and stirring apparatus can be freely closed from an open state when the sleeve rotates at a predetermined angle with respect to the rod. 10. A sleeve is rotatably mounted on the excavating rod in any direction relative to the excavating rod, and the excavating agitating blade and the agitating impeller have a fixed angle in one direction of the sleeve with respect to the excavating rod. The excavating and stirring device according to claim 9, wherein the excavating and stirring device is freely openable from a closed state when rotating, and is freely openable from a closed state when rotating at a certain angle in the other direction.