JP4125310B2 - Additive discharging device to soil and method for adding additive to soil - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an additive discharge device to soil and an additive addition method to soil, and more particularly, addition to soil in which the additive can be successfully added to soil when proceeding or retreating into soil. The present invention relates to an agent discharge device and an additive addition method to soil.

Adding additives to soil has been performed for various purposes. For example, when soil contains pollutants, additives corresponding to the pollutants are added to the soil in order to detoxify the pollutants, or additions containing nutrients to feed the soil Additives to the soil, and additives (solidifying agents, such as cement, for solidifying the original soft ground (soil) so that the ground can support the load of the building, etc. when building a building, etc. And the like have been added to the soil.
It is necessary to add the additive to the soil to be added as uniformly as possible to the soil to be added, but the soil to be added is located in a deep position below the ground. It is often difficult.

For example, when an additive is added to the soil in order to solidify the soft ground (soil) as described above, the additive (solidifying agent. For example, cement-based solidifying material slurry, cement, etc. For example, Patent Document 1 discloses many devices and methods for this purpose.
Patent Document 1 states that “a screw blade is formed on the outer periphery of the outer tube of a double tube, the outer diameter of the screw blade is smaller than the outer diameter of the tip of the stirring blade, and the stirring head is connected to the lower end of the screw rod having a predetermined outer diameter. The stirrer head is provided with a plurality of stirrer blades arranged in the axial direction, and provided with two outlets for solidifying material at the upper and lower portions, each of which is provided inside the double tube rod. A ground improvement device characterized in that it communicates with the outer pipe "(Claim 2 of Patent Document 1) is disclosed.
Further, in Patent Document 1, “a rod body in which a stirring head having a plurality of stirring blades is connected to a lower end of a screw rod having a predetermined outer diameter smaller than a stirring blade tip outer diameter is forwardly rotated and fed, After excavating to a predetermined depth in the improved section, forward and forward while discharging the solidified material from the lower discharge port among the discharge ports provided above and below the stirring head, and the distance between the upper and lower discharge ports The tip is improved by excavating and stirring to reach the lower end of the improved section, and then the rod body is rotated forward and pulled while discharging the solidified material from the upper discharge port, and stirred with a stirring blade. The ground improvement method is characterized in that the soil is removed by the screw rod, and then the improvement unnecessary section is lifted by rotating the rod body forward or reverse. "(Claim 1 of Patent Document 1) Has been.
In the ground improvement device and the ground improvement method described in Patent Document 1, “To improve the tip C, the solidified material S is removed from the lower discharge port 20 of the agitation head 11 as shown in FIG. While being discharged, the rod 13 is rotated forward to advance, and the distance between the upper and lower discharge ports is nearly excavated and stirred to the lower end of the improved section B. Next, the upper part as shown in FIG. The solidification material S is discharged from the discharge port 18 and the agitation / lifting is performed while the screw rod 13 is rotated in the forward direction ”(page 2, column 4, line 16 to line 24 of Patent Document 1). In this way, when the stirring head 11 moves downward, the solidified material S is discharged from the lower discharge port 20 and when the stirring head 11 is lifted (that is, moved backward), it is solidified from the upper discharge port 18. By discharging the material S, “injection stirring The reason why the discharge port for the solidified material in the boiling process is the upper discharge port 18 is to make the mixed stirring effect of the stirring blades 14, 15, 16 more effective ”(page 2, page 4, in Patent Document 1). Column 36th line to 39th line).

Japanese Examined Patent Publication No. 5-62167 (for example, claims (claims 1 and 2), page 2, column 3, line 29 to column 4, line 39, FIG. 1, FIG. 2, etc.)

However, in the ground improvement device and the ground improvement method described in Patent Document 1, “the screw rod 13 and the stirring head 11 are each formed in a double pipe structure, and the upper discharge port 18 is formed at the lower end portion of the inner pipe 17. A lower discharge port 20 is opened at a lower end portion of the outer tube 19. A solidifying material such as a cement-based solidifying material is supplied to the inner tube 17 and the outer tube 19 from an apparatus on the ground. 18 and 20 is configured such that the solidified material is discharged at a predetermined pressure ”(second page, third column, lines 36 to 44 in Patent Document 1).
As described above, the ground improvement device and the ground improvement method described in Patent Document 1 usually require the supply of the solidified material to be switched by a valve or the like after the screw rod 13, which tends to be long, has a double pipe structure. There is a problem that the structure of the screw rod is complicated, and there is a problem that the device is expensive and heavy, and there is a problem that the work load is heavy because the valve operation etc. is required when carrying out the construction method or the valve operation There was also a possibility of mistakes.
Therefore, in the present invention, it is not necessary to use a double-pipe structure for a material for transferring such an additive (for example, screw rod 13 in Patent Document 1), and the additive (solidifying material in Patent Document 1). It is an object of the present invention to provide an additive discharge device for soil and a method for adding additive to soil, which do not require a separate valve for switching the supply of the additive.

  The additive discharge device to the soil of the present invention (hereinafter referred to as “the present device”) includes a rotating outer surface that forms at least a part of a rotating surface with a rotating shaft as an axis, and excavating and / or stirring the soil. An inner shaft having a flow path for circulating an additive added to the soil, an inner discharge port formed on the outer surface of the rotation so as to communicate with the flow path, and a rotation for excavating and / or stirring the soil A wing is attached to the outer surface, and is a hollow outer shaft that is externally fitted to the inner shaft so as to be rotatable around the rotation axis within a predetermined range, and at least a part of the rotation surface with the rotation axis as an axis. A first receiving port and a second receiving port that are formed on the rotating inner surface facing the rotating outer surface, a first outer discharge port formed on the outer surface so as to communicate with the first receiving port, and a first outer discharge The outlet is formed so as to communicate with the second receiving port on the outer surface distant from the rotation axis. An outer shaft having a second outer discharge port, and in a first rotation position that is a limit in one direction of the predetermined range in which the outer shaft can rotate relative to the inner shaft. An additive discharge device for soil, wherein the inner discharge port and the first receiving port communicate with each other, and the inner discharge port and the second receiving port communicate with each other at the second rotational position that is the limit in the other direction. is there.

The apparatus includes an inner shaft and a hollow outer shaft that is fitted onto the inner shaft.
The inner shaft has a flow path for circulating the additive added to the soil when excavating and / or stirring the soil, and the additive is added to the inner discharge port that communicates with the flow path via the flow path. Circulate. Since the inner discharge port is formed on the rotating outer surface that forms at least a part of the rotating surface with the rotation axis as an axis, the additive can be discharged from the inner discharging port located on the rotating outer surface. The “rotation surface about the rotation axis” means a curved surface drawn by one curve (including a straight line) on the plane when the plane to which the rotation axis belongs is rotated once about the rotation axis ( same as below).
The hollow outer shaft is externally fitted to the inner shaft so as to be rotatable around the rotation axis within a predetermined range, and can rotate in one direction (rotation) of the rotation range of the outer shaft relative to the inner shaft. The limit of the movement direction is the first rotation position, and the limit of the other direction (refers to the rotation direction, which is the opposite direction to the one direction) is the second rotation position. That is, the rotation of the outer shaft relative to the inner shaft is allowed from the first rotation position that is the limit in one direction to the second rotation position that is the limit in the other direction (the direction opposite to the one direction) (in other words, Then, the predetermined range that can be rotated is a range from the first rotation position to the second rotation position.) The outer shaft is formed on a rotating inner surface (the rotating inner surface also forms at least a part of a rotating surface with the rotating shaft as an axis) facing the rotating outer surface (the inner discharge port of the inner shaft is formed). A first outer discharge port formed on the outer surface (outer surface of the outer shaft) so as to communicate with the first receiving port and a second receiving port. And a second outer discharge port formed on the outer surface (the outer surface of the outer shaft). Here, the second outer discharge port is formed on the “outer surface distant from the first outer discharge port in the direction of the rotation axis”. This is from the outer surface position of the outer shaft where the second outer discharge port is formed. From the second perpendicular foot position, which is the position of the perpendicular foot, to the straight line to which the rotation axis belongs (hereinafter referred to as the “axial straight line”), and from the outer surface position of the outer shaft where the first outer discharge port is formed to the axial straight line. This means that the first perpendicular foot position, which is the position of the lowered perpendicular foot, is different. Further, since the rotor blades for excavating and / or stirring the soil are attached to the outer surface of the outer shaft, the rotor blades are excavated and / or brought into contact with the soil while being rotated around the rotating shaft. Or it can be stirred.
Of the rotational positions of the outer shaft relative to the inner shaft, the inner discharge port and the first receiving port communicate with each other at the first rotation position (the rotation limit in one direction), and the additive is supplied from the inner discharge port to the first. It can be discharged from a first outer discharge port that is received at the receiving port and communicates with the first receiving port. On the other hand, the inner discharge port and the second receiving port communicate with each other at the second rotation position (the rotation limit in the other direction opposite to the one direction) among the rotation positions of the outer shaft with respect to the inner shaft. The additive is received from the discharge port into the second receiving port and discharged from the second outer discharge port communicating with the second receiving port. In this way, in the present apparatus, by changing the rotation position of the outer shaft relative to the inner shaft to the first rotation position and the second rotation position, the discharge position at which the additive is discharged is set in the rotation axis direction. Can be changed to either the first outer discharge port or the second outer discharge port separated from each other. In other words, this device can be added from different positions away from each other in the rotational axis direction by changing the relative rotational position of both shafts with a simple configuration using an inner shaft and a hollow outer shaft fitted on the inner shaft. The agent can be discharged. In this apparatus, since the apparatus itself switches between the first outer discharge port and the second outer discharge port by changing the rotational position of the outer shaft relative to the inner shaft, the additive is discharged up to the present device. (For example, the screw rod 13 in Patent Document 1) does not need to have a double tube structure (that is, the additive transfer path to the apparatus may be single), and further the additive. There is no need to provide a separate valve for switching the supply.
Note that changing the rotation position of the outer shaft relative to the inner shaft to the first rotation position and the second rotation position is not limited in any way, and various methods may be used. It is also possible to change the direction of rotating the inner shaft between one direction and the other direction. That is, when the inner shaft is rotated in one direction around the rotation axis, the outer shaft receives frictional force or resistance force in a direction in which the outer shaft does not rotate in the one direction from the soil existing around the outer shaft. The rotational position of the outer shaft with respect to the inner shaft becomes the first rotational position that is the limit in one direction of the predetermined range that can be rotated by this frictional force or resistance force. When the inner shaft is rotated in the other direction around the rotation axis, the outer shaft receives frictional force or resistance force in a direction in which the outer shaft does not rotate in the other direction from the soil existing around the outer shaft. The rotational position of the outer shaft relative to the inner shaft becomes the second rotational position that is the limit in the other direction of the predetermined range that can be rotated by this frictional force or resistance force.

The inner discharge port of the inner shaft may be a single one or two. If the inner discharge port is a single one, the rotation position of the outer shaft with respect to the inner shaft is changed, and when one inner discharge port is in the first rotation position, it communicates with the first receiving port, In the case of the second rotation position, it may be communicated with the second receiving port.
Further, when there are two inner discharge ports, the inner discharge port communicates with the first inner discharge port that communicates with the first receiving port at the first rotation position and the second receiving port at the second rotation position. A second flow path of the additive formed between the first receiving port and the first outer discharge port, and a second receiving port. And the second flow path of the additive formed between the second outer discharge port and the second outer discharge port can be configured to be short and simple (as described above, one inner discharge port has the first rotation position. In this case, when the first receiving port is in communication with the second receiving port in the second rotation position, the first outer discharge port and the second outer discharge port are separated from each other in the rotational axis direction. It is necessary that at least one of the first flow path and the second flow path has a portion extending along the rotation axis direction). (The outer shaft is attached to the rotor blades and is subject to friction and collision with the soil and rock. Therefore, the outer shaft has a long first flow path and second flow path that are hollow. Preferably not.)

In the first rotation position, the first rotation restriction inner portion of the inner shaft contacts the first rotation restriction outer portion of the outer shaft, so that the outer shaft moves in the one direction with respect to the inner shaft. Further, it is prohibited to rotate, and in the second rotation position, the second rotation restriction inner part of the inner shaft abuts on the second rotation restriction outer part of the outer shaft, The outer shaft may be prohibited from further rotating in the other direction with respect to the inner shaft.
This prevents the outer shaft from further rotating in the one direction with respect to the inner shaft when the first rotation restricted inner portion contacts the first rotation restricted outer portion at the first rotation position. Further, when the second rotation restricted inner portion abuts on the second rotation restricted outer portion at the second rotation position, the outer shaft is prohibited from further rotating in the other direction with respect to the inner shaft. Thus, the rotatable position of the outer shaft with respect to the inner shaft can be reliably and easily limited between the first rotating position and the second rotating position, and the rotating position of the outer shaft with respect to the inner shaft is first. By reliably positioning at either the rotation position or the second rotation position, the additive can be reliably discharged from either the first outer discharge port or the second outer discharge port.
It should be noted that the first rotation restriction inner part and the second rotation restriction inner part may be either integral or separate from each other, and similarly, the first rotation restriction outer part and the second rotation restriction outer part. The part may be either integral or separate.

At least a part of the rotary blade may exist between the first outer discharge port and the second outer discharge port.
By doing so, the additive discharged from the first outer discharge port or the second outer discharge port can be stirred and mixed with the soil by the rotor blades.
Note that “exists between the first outer discharge port and the second outer discharge port” is a position of a foot of a perpendicular line that is lowered from the outer surface position of the outer shaft on which the first outer discharge port is formed in an axial straight line. A first reference surface that is a plane that includes the first perpendicular foot position and is perpendicular to the axial straight line, and a vertical foot position that extends downward from the outer surface position of the outer shaft on which the second outer discharge port is formed. At least a part of the rotor blade exists in a space between the second reference plane that includes a second perpendicular foot position and is perpendicular to the axis line (the device around the rotation axis). When the is rotated, it is sufficient that at least a part of the rotor blade exists in the space at least at any one rotational position.

The rotating outer surface and the rotating inner surface may be formed by side surfaces of a right circular cylinder having the rotation axis as an axis.
By doing so, the inner shaft can be formed by a round column member having a right circular column shape, and the hollow shaft member (in which the inner space is straight) that the outer shaft can be fitted with a right round column shape round bar. It is sufficient that a cylindrical round bar can be accommodated.), Both of these members can be easily formed, and the apparatus can be configured at low cost and easily.

By rotating the inner shaft in one direction around the rotating shaft, the outer shaft rotates in one direction with the outer shaft positioned at the first rotation position with respect to the inner shaft, and is attached to the outer shaft. The rotary blades have a function of excavating the soil and entering the soil, and the inner shaft is rotated in the other direction around the rotation axis, so that the outer shaft is the second shaft with respect to the inner shaft. The outer shaft is rotated in the other direction in a state of being in the rotating position, and the rotary blade attached to the outer shaft has a function of retreating from the soil. The first outer discharge port is more than the second outer discharge port. It may be one located in the excavation direction (hereinafter referred to as “soil-driven stirring and mixing apparatus”).
In this way, the inner shaft is rotated in one direction around the rotation axis, so that the outer shaft rotates in one direction with the outer shaft positioned at the first rotation position with respect to the inner shaft. Since the rotor blade attached to the outer shaft digs up the soil and enters the soil, the additive is discharged from the first outer discharge port located in the digging direction (the additive is in the first rotation position). It is received from the discharge port to the first receiving port and discharged from the first outer discharge port.), The additive discharged from the first outer discharge port and the excavated soil can be well stirred and mixed. Conversely, when the inner shaft is rotated in the other direction around the rotating shaft, the outer shaft is positioned at the second rotation position with respect to the inner shaft (for example, the other direction around the rotating shaft is the other direction). When the inner shaft is rotated, the outer shaft receives a frictional force and a resistance force in a direction in which the outer shaft does not rotate in the other direction from the soil existing around the outer shaft. Since the outer shaft is rotated in the other direction and the rotor blade attached to the outer shaft is retracted from the soil, the outer shaft is positioned in the direction opposite to the excavation direction. By discharging the additive from the second outer discharge port (in the second rotation position, the additive is received from the inner discharge port into the second receiving port and discharged from the second outer discharge port), thereby causing the second outer discharge. The additive discharged from the outlet and the soil It is possible to 拌 mixed. In this way, according to the soil-driven stirring and mixing apparatus, the additive and the soil can be stirred and mixed well by utilizing the action of the rotor blades driving the soil.

This invention also provides the method (henceforth "this method") which adds an additive to the soil using a soil drive stirring mixing this apparatus. The method includes a first addition step of discharging the additive from the first outer discharge port while rotating the inner shaft in one direction around the rotating shaft and entering the soil, and in the other direction around the rotating shaft. And a second addition step of discharging the additive from the second outer discharge port while rotating the inner shaft backward with respect to the soil, and an additive addition method to the soil.
By doing so, as described above, the additive and the soil can be well stirred and mixed using the action of the rotor driving the soil.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited by these.

FIG. 1 is a front view showing an additive discharge device (this device) 11 for soil according to the present invention, and FIG. 2 is a right side view showing the device 11 (as viewed from the direction of arrow D in FIG. 1). Is.) 3 is an AA end view of FIG. 1 (the end face position is also shown as AA in FIG. 2), and FIG. 4 is a BB end view of FIG. 1 (the end face position is also shown in FIG. 2). In order to facilitate illustration and understanding, hatching indicating end surfaces is attached to an insertion portion 27 of the inner shaft 21 described later and an outer shaft 51 in contact with the insertion portion 27, 5 is an end view taken along the line CC of FIG. 1 (the position of the end face is also shown as CC in FIG. 2 for ease of illustration and understanding). Therefore, hatching indicating end surfaces is attached to a fitting portion 27 of the inner shaft 21 described later and an outer shaft 51 in contact with the fitting portion 27, and hatching is omitted for the other portions. 6 shows a portion including an inner shaft 21, an outer shaft 51, and a tip member 81, which will be described later, of the EE end surface of FIG. 1 (an end surface formed by a plane parallel to the surface shown in FIG. 2). FIG. 7 is a front view of the inner shaft 21 described later, FIG. 8 is a right side view of the inner shaft 21 (FIG. 8A), and an end view of FIG. 7 (FIG. 8B is F in FIG. 7). -F end view, FIG. 8 (c) is a GG end view of FIG. 7, and FIG. 8 (d) is a HH end view of FIG. Further, FIG. 9 is a cross-sectional view of the outer shaft 51 described later (the cross-sectional position is the same as the EE cross-section of FIG. 1 (that is, FIG. 6)), and FIG. 10 is a plan view of the outer shaft 51 (FIG. 9). Middle, viewed from the direction of arrow J.). The apparatus 11 will be described with reference to FIGS. In the figure, the tip direction (the direction in which the apparatus 11 excavates soil (not shown)) is indicated by an arrow P1, and the proximal direction (the direction opposite to the tip direction) is indicated by an arrow P2 (arrows P1 and All of the arrows P2 are parallel to the rotation axis indicated by the dotted line K).
The present apparatus 11 generally includes an inner shaft 21, an outer shaft 51, a tip member 81, an excavating blade 91, a stirring blade 95, and a free rotating blade 97.

The inner shaft 21 is formed of a steel rod-like member, and is located on the proximal end side of the inner shaft 21 and has a connection part 23 having a substantially straight hexagonal column shape, and a substantially straight shape attached to the distal end side of the connection part 23. It is formed so as to protrude from the outer surface of the fitting portion 27 so as to be adjacent to the collar portion 25, the collar portion 25 having a columnar shape, the fitting portion 27 having a substantially right column shape attached to the distal end side of the collar portion 25. And a protruding portion 29. The inner shaft 21 can be smoothly rotated around the rotation axis indicated by the dotted line K in FIG. 7 (the center of gravity of the inner shaft 21 exists on the rotation axis. Note that the collar portion 25 is formed. The substantially right cylindrical column shaft and the substantially right cylindrical column axis formed by the fitting portion 27 exist on the rotation axis, and the substantially hexagonal column shaped bus line formed by the connecting portion 23 is the rotation axis. (The center of gravity of the connecting portion 23 is also on the rotation axis).
On the other hand, an inner flow path 31 is formed in the inner shaft 21 along the rotation axis indicated by a dotted line K in FIG. The internal flow path 31 has a right cylindrical shape with the rotation axis as an axis, and the proximal end side and the distal end side are open (that is, the internal flow path 31 extends from the proximal end to the distal end of the inner shaft 21. A continuous flow path is formed.)

The connecting portion 23 is for connecting to a heavy machine or the like (not shown) that rotates the apparatus 11 and has a substantially rectangular hexagonal column shape. The vicinity of one (base end side) of both bottom surfaces of the substantially right hexagonal column is rounded with a rounded corner (substantially right truncated cone portion 23a) so as to have a substantially right truncated cone shape. A heavy machine or the like (not shown) that rotates the device 11 is provided with an inner fitting portion (not shown) for connecting the connecting portion 23 by fitting the connecting portion 23 having a substantially rectangular hexagonal column shape. By providing the truncated cone portion 23a and easily and quickly fitting the connecting portion 23 to the inner fitting portion (not shown), it can be easily and quickly connected to a heavy machine or the like (not shown) that rotates the apparatus 11. Is for. In addition, a pair of concave grooves 23b1 and 23b2 are formed on the substantially parallel side surfaces of the substantially rectangular hexagonal column shape formed by the connecting portion 23. The pair of concave grooves 23b1 and 23b2 are connected to the connecting portion 23. When the inner fitting portion (not shown) is fitted, a claw portion (not shown) provided so as to protrude from the inner wall of the inner fitting portion (not shown) is engaged, whereby the connection portion 23 is engaged. This is intended to prevent the inner fitting portion (not shown) from accidentally falling off.
The collar portion 25 has a substantially right circular column shape having a larger radius than the radius of the substantially right circular column shape formed by the fitting portion 27.
The fitting portion 27 has a substantially right circular cylinder (the axis of the right circular cylinder is included in the same straight line as the rotation axis indicated by the dotted line K), and is fitted into the outer shaft 51 (detailed later). The A first inner discharge port 27h1 and a second inner discharge port 27h2 are formed on the side surface 27a of the fitting portion 27 so as to communicate with the internal flow path 31. Both the first inner discharge port 27h1 and the second inner discharge port 27h2 are substantially perpendicular to the axis of a substantially right circular cylinder formed by the fitting portion 27 (included in the rotation axis indicated by the dotted line K in FIG. 7). By being formed in the direction, the side surface 27a and the internal flow path 31 are communicated with each other through the shortest distance. The first inner discharge port 27h1 and the second inner discharge port 27h2 are separated with respect to the direction of the rotation axis (dotted line K) (distance M in FIGS. 7 and 6), and the substantially right circular cylinder formed by the fitting portion 27. (Refer to Fig. 8 (b) and Fig. 8 (c). The first inner discharge port 27h1 and the second inner port only at an angle N in Fig. 8 (c). The rotational position of the discharge port 27h2 is different.)
The protruding portion 29 is formed in a pair at a predetermined position on the outer surface of the fitting portion 27 so as to be adjacent to the flange portion 25. This is because it is inserted into notches 55a and 55b formed in the vicinity of the base end of the outer shaft 51 (details will be described later) (the projecting portions 29a and 29b of the outer shaft 51 defining the notches 55a and 55b). 7, the rotational position of the outer shaft 51 relative to the inner shaft 21 around the rotational axis indicated by the dotted line K in FIG. 7 is allowed only within a predetermined range (that is, outside the predetermined range). Is forbidden to rotate.)

The outer shaft 51 is a hollow substantially straight cylinder having an inner space 53 (see FIG. 9) into which the fitting portion 27 (substantially right circular cylinder) of the inner shaft 21 is fitted. It has a shape. The internal space 53 has a substantially right circular cylinder (a right circular cylinder with the rotation axis indicated by the dotted line K as an axis) whose base end side and distal end side are open, and the outer shaft 51 as a whole is a cylindrical tube. It has a (pipe) shape.
A pair of notches 55a and 55b are formed in the vicinity of the base end side of the outer shaft 51. As described above, the pair of notches 55a and 55b receive the projecting portions 29a and 29b of the inner shaft 21, respectively. The rotational position of the outer shaft 51 with respect to the shaft 21 is allowed only within a predetermined range.
A first outer discharge port 57a and a second outer discharge port 57b are formed at two different points existing on one generatrix of the substantially straight cylinder formed by the outer shaft 51. The first outer discharge port 57 a communicates with a first receiving port 59 a formed on the inner surface that defines the inner space 53 of the outer shaft 51. Similarly, the second outer discharge port 57 b communicates with a second receiving port 59 b formed on the inner surface that defines the inner space 53 of the outer shaft 51. When the fitting portion 27 of the inner shaft 21 is fitted into the internal space 53 (in such a case, the side surface 27a of the fitting portion 27 and the inner surface defining the inner space 53 of the outer shaft 51 are almost in sliding contact. ), When the rotation position of the outer shaft 51 with respect to the inner shaft 21 is a predetermined position (first rotation position), the first inner discharge port 27h1 communicates with the first receiving port 59a (FIGS. 11 and 12, which will be described later). 13 and 14 show this state.) In addition, when the rotational position of the outer shaft 51 relative to the inner shaft 21 is another predetermined position (second rotational position), the second inner discharge port 27h2 is (FIG. 3, FIG. 4, FIG. 5 and FIG. 6 show this state. As shown in FIG. 3, the notches 55a and 55b are the protruding portions 29a of the inner shaft 21. Accepting 29b Thus, the protrusions 29a and 29b abut on the surface of the outer shaft 51 that defines the notches 55a and 55b, thereby further rotating the outer shaft 51 with respect to the inner shaft 21 (in FIG. 3, further clockwise rotation). Therefore, even if a force is applied to further rotate the outer shaft 51 in the clockwise direction in FIG. 3, the outer shaft 51 does not rotate, so that the second inner discharge port 27h2 2) The communication state to the receiving port 59b is maintained.
Further, the first outer discharge port 57a and the first receiving port 59a are on a straight line perpendicular to the axis of the substantially straight cylinder formed by the outer shaft 51, and the first outer discharge port 57a and the first receiving port 59a. Are formed along the straight line (the flow path is designed to be the shortest). Similarly, the second outer discharge port 57b and the second receiving port 59b exist on a straight line perpendicular to the axis of the substantially straight cylinder formed by the outer shaft 51, and the second outer discharge port 57b and the second receiving port. The flow path communicating with 59b is formed along the straight line (the flow path is set to be the shortest). Note that a first lubricating hole 63a is formed on the opposite side of the substantially right circular cylinder formed by the outer shaft 51 from the first outer discharge port 57a so that the inner space 53 of the outer shaft 51 and the outer 61 communicate with each other. In addition, a second lubrication hole 63b is formed on the opposite side of the substantially right cylinder to the second outer discharge port 57b so as to communicate the inner space 53 of the outer shaft 51 and the outer 61. Both the first lubrication hole 63a and the second lubrication hole 63b improve lubrication between the inner surface that defines the inner space 53 of the outer shaft 51 and the outer surface of the fitting portion 27 of the inner shaft 21 that is fitted into the inner space 53. Therefore, it is formed for injecting grease or lubricating oil.
On the other hand, the outer surface (the first outer discharge port 57a and the second outer discharge port) of the outer shaft 51 are supported so that a later-described free rotary blade 97 is rotatably supported around the rotation axis of the apparatus 11 indicated by a dotted line K. A free rotor support portion 65 is formed on the outer surface portion between the outlet 57b. The free rotor support portion 65 includes a first ring portion 65a and a first ring portion formed in a ring shape so as to protrude from the outer surface of the outer shaft 51 along two different planes perpendicular to the rotation axis (dotted line K). 2 ring part 65b and the cylindrical cylinder part 65c which covers the outer surface of the outer shaft 51 between the 1st ring part 65a and the 2nd ring part 65b. As will be described later, the externally-fitted cylindrical portion 97a of the free-rotating blade 97 is externally fitted to the cylindrical portion 65c so that the free-rotating blade 97 is rotated by the first ring portion 65a and the second ring portion 65b. The movement in the direction of the axis (dotted line K) is limited (the position in the direction of the rotational axis (dotted line K) is kept at a predetermined position), but supported by the outer shaft 51 so as to be rotatable around the rotational axis. The

The distal end member 81 is detachably attached to the distal end of the insertion portion 27 of the inner shaft 21 (specifically, it is screwed, but a screw hole formed in the insertion portion 27 is a screw hole in FIG. 8A). Shown as hole 27d).
The tip member 81 has a disk portion 83 formed of a plate-like member whose main surface is substantially circular, and a protruding portion 85 attached to the disk portion 83 and formed of a plate-like member whose main surface is a pentagon. is doing. The disc portion 83 is attached to the tip of the fitting portion 27 so that the rotation axis (dotted line K) substantially passes through the substantially circular center formed by the main surface thereof. The protruding portion 85 is attached to the disk portion 83 so that one vertex of the pentagon formed by the main surface (the rotation axis (dotted line K) substantially passes through the one vertex) faces the tip direction.
The diameter of the substantially circular shape formed by the main surface of the disk portion 83 is larger than the diameter of the substantially right circular cylinder formed by the inner space 53 of the outer shaft 51 (of course, the substantially right circular cylinder formed by the fitting portion 27). The rotation of the outer shaft 51 relative to the inner shaft 21 by the disk portion 83 abutting on the distal end portion of the outer shaft 51 and the collar portion 25 abutting on the proximal end portion of the outer shaft 51. The relative position change in the direction of the axis (dotted line K) is limited. Here, the length between the proximal end portion and the distal end portion of the outer shaft 51 is made substantially the same as the distance between the distal end surface of the collar portion 25 and the proximal end surface of the disk portion 83. (The length is made slightly smaller than the distance). Thus, in a state where the relative position change of the outer shaft 51 in the direction of the rotation axis (dotted line K) with respect to the inner shaft 21 is restricted, the first inner discharge port 27h1 and the first receiving port 59a are connected to the rotation shaft. The second inner discharge port 27h2 and the second receiving port 59b are on another plane perpendicular to the rotation axis (dotted line K). For this reason, the first inner discharge port 27h1 and the first inner discharge port 27h1 are arranged at a rotation position of the outer shaft 51 with respect to the inner shaft 21 (here, a first rotation position which is a limit in one direction of a predetermined range in which rotation is possible). The second inner discharge port 27h2 and the second receiving port are in communication with the first receiving port 59a and in another rotating position (here, the second rotating position which is the limit in the other direction of the predetermined range in which rotation is possible). 59b communicates.

The excavation blade 91 has a pair of plate-like (elongated strip-like) support members 92 a and 92 b (one of the support members 92 a and 92 b are attached to the outer surface near the tip of the outer shaft 51. And 3 excavation blades 93a attached to the support member 92a and 3 excavation blades 93b attached to the support member 92b. And. The excavation blade 93a and the excavation blade 93b are attached so that the tip directions of the blades 93a and 93b form a predetermined angle 101a and 101b (see FIG. 2) with a plane perpendicular to the rotation axis (dotted line K). Therefore, when the outer shaft 51 rotates around the rotation axis (dotted line K), it has an action of excavating and entering the soil in one direction of rotation and an action of retreating from the soil in the other direction of rotation.
The support members 92a and 92b are formed on the outer shaft such that the main surfaces of the support members 92a and 92b form a predetermined angle (angle 103 in FIG. 2) with a plane perpendicular to the rotation axis (dotted line K). 51. When the outer shaft 51 rotates around the rotation axis (dotted line K) in the one direction, the outer shaft 51 has an action of excavating the soil and entering the soil, and when rotating in the other direction, the soil (I.e., when the excavation blade 93a and the excavation blade 93b excavate the soil and enter the soil, the support members 92a and 92b also have the same function as the excavation blade 93a and the excavation blade 93b). When the member retracts from the soil, the supporting members 92a and 92b have the same function.)

The stirring blade 95 has a pair of plate-shaped (elongated strip-shaped) tip side stirring blades, one end of which is attached to the outer surface of the outer shaft 51 (the portion between the first outer discharge port 57a and the second outer discharge port 57b). 95a1, 95a2 and a pair of plate-like (elongated strip-like) proximal side agitation attached at one end to the outer surface of the outer shaft 51 (the portion between the first outer discharge port 57a and the second outer discharge port 57b) Wings 95b1 and 95b2. The distal-side agitating blades 95a1 and 95a2 and the proximal-side agitating blades 95b1 and 95b2 are all attached so that the longitudinal direction is substantially perpendicular to the axis of the substantially right cylinder formed by the outer shaft 51.
Each of the leading end side stirring blades 95a1 and 95a2 and the base end side stirring blades 95b1 and 95b2 has a main surface whose surface is perpendicular to the rotation axis (dotted line K) at a predetermined angle (angle 94 in FIG. 2). The outer shaft 51 is attached to the outer surface of the outer shaft 51, and when the outer shaft 51 rotates in the one direction around the rotation axis (dotted line K), the outer shaft 51 has an action of excavating and entering the soil. When rotating in the other direction, it has an action of retreating from the soil (that is, when the excavating blade 93a and the excavating blade 93b dig up the soil and enter the soil, the tip side stirring blades 95a1, 95a2 and the base end side stirring blades 95b1, 95b2 also has the same action, and when the excavating blade 93a and the excavating blade 93b are retracted from the soil, the distal-side stirring blades 95a1 and 95a2 and the proximal-side stirring blades 95b1 and 95b2 have the same operation. That.).

The free rotating blade 97 includes an external fitting cylindrical portion 97a that is externally fitted to the cylindrical portion 65c of the free rotating blade support portion 65, and a pair of plate-shaped (elongated strip-shaped) blades attached to the external fitting cylindrical portion 97a. Main bodies 97b and 97c.
The outer fitting cylindrical portion 97a is formed by connecting two hollow semi-cylindrical portions obtained by cutting a hollow straight cylinder (bottomless and uncovered) with a plane including its axis by a pair of bolts and nuts, and a cylindrical portion 65c. And can be freely rotated around the rotation axis (dotted line K) with respect to the outer shaft 51. On the other hand, the outer fitting tube portion 97a cannot pass either the first ring portion 65a or the second ring portion 65b (either the outer diameter of the first ring portion 65a or the outer diameter of the second ring portion 65b). Is larger than the inner diameter of the outer fitting cylindrical portion 97a, the annular edge on the distal end side of the outer fitting cylindrical portion 97a abuts on the first ring portion 65a, and the annular edge on the proximal end side of the outer fitting cylindrical portion 97a is second. The movement in the direction of the rotation axis (dotted line K) that is in contact with the ring portion 65b is limited. The outer fitting tube portion 97a is formed with a nozzle-shaped opening 97ah that allows the outer surface and the inner surface to communicate with each other. This opening 97ah is formed between the inner surface of the outer fitting tube portion 97a and the tube portion 65c. And lubricating oil or the like.
The pair of plate-like (elongated strip-shaped) wing bodies 97 b and 97 c are attached so that their longitudinal directions are substantially perpendicular to the axis of the substantially right cylinder formed by the outer shaft 51. Further, the wing bodies 97b and 97c are attached to the outer shaft 51 so that the main surfaces of the wing bodies 97b and 97c are substantially parallel to the axis of the substantially right cylinder formed by the outer shaft 51.

In the present apparatus 11, as described above, the protrusions 29a and 29b are fitted into the notches 55a and 55b, and the protrusions 29a and 29b abut against the surface of the outer shaft 51 that defines the notches 55a and 55b. Thus, the rotation of the outer shaft 51 relative to the inner shaft 21 around the rotation axis indicated by the dotted line K in FIG. 7 is allowed only within a predetermined range. 3, 4, 5, and 6, the outer shaft 51 is prohibited from further rotating in the clockwise direction with respect to the inner shaft 21 in FIGS. 3, 4, and 5. In this state (this state is referred to as the second rotation position), the second inner discharge port 27h2 communicates with the second receiving port 59b, but the first inner discharge port 27h1 It does not communicate with one receiving port 59a.
Then, the outer shaft 51 can be rotated in the counterclockwise direction (in the direction of arrow Q in FIG. 3) with respect to the inner shaft 21 from the state of FIG. 3, FIG. 4 and FIG. The communication from the second inner discharge port 27h2 to the second receiving port 59b is cut off, and when further rotated, the projecting portions 29a and 29b come into contact with the surface of the outer shaft 51 that defines the notches 55a and 55b. This contact may cause the outer shaft 51 to further rotate in the counterclockwise direction (in the direction of arrow Q in FIG. 3) with respect to the inner shaft 21 around the rotation axis indicated by the dotted line K in FIG. (As shown in FIG. 11, the notches 55a and 55b receive the protruding portions 29a and 29b of the inner shaft 21, and the protruding portions 29a and 29b define the notches 55a and 55b. On the face By contact, further rotation of the outer shaft 51 with respect to the inner shaft 21 (further rotation in the counterclockwise direction in FIG. 11) is prohibited, and thereby the outer shaft 51 in the counterclockwise direction in FIG. The outer shaft 51 does not rotate even if a force is applied so as to further rotate the shaft, so that the communication state from the first inner discharge port 27h1 to the first receiving port 59a is maintained. This state (this state is referred to as a first rotation position) is shown in FIGS. 11 shows an end face similar to FIG. 3, FIG. 12 shows an end face similar to FIG. 4, FIG. 13 shows an end face similar to FIG. 5, and FIG. The same end surface as is shown. In the first rotational position shown in FIGS. 11 to 14, the first inner discharge port 27h1 communicates with the first receiving port 59a, but the second inner discharge port 27h2 communicates with the second receiving port 59b. Not.
That is, in the first rotation position and the second rotation position, the outer shaft 51 is different from the inner shaft 21 in the rotation position between the first inner discharge port 27h1 and the second inner discharge port 27h2 (FIG. 8 ( As shown in FIG. 8B and FIG. 8C, there is a difference in rotational position between the first inner discharge port 27h1 and the second inner discharge port 27h2 by an angle N in FIG. 8C. Rotate by the same angle. Thereby, in the first rotation position, the first inner discharge port 27h1 and the first receiving port 59a communicate with each other, and the communication between the second inner discharge port 27h2 and the second receiving port 59b is cut off. In the moving position, the second inner discharge port 27h2 and the second receiving port 59b communicate with each other, and the first inner discharge port 27h1 and the first receiving port 59a are disconnected. A predetermined range in which the outer shaft 51 is rotatable with respect to the inner shaft 21 is determined so as to be like this (specifically, indicated by a dotted line K so as to allow a desired rotation range and prohibit other rotations). The shape of the protrusions 29a and 29b and the cutouts 55a and 55b with respect to the rotation axis can be determined.

FIG. 15 is a partial cross-sectional view showing how to use the apparatus 11. With reference to FIG. 15, the usage method (this method) of this apparatus 11 is demonstrated easily.
First, the apparatus 11 is attached to the heavy machine 201 as shown in FIG. Specifically, it attaches by making the connection part 23 fit in the internal fitting part (not shown) which the heavy machinery 201 has. At this time, an additive (for example, cement milk) added to the soil 301 can be supplied to the internal flow path 31. The open end of the internal flow path 31 (the opening of the internal flow path 31 existing at the base end of the connection portion 23). ) Is connected to an additive supply pipe (not shown). The heavy machine 201 is configured so that the apparatus 11 attached to the heavy machine 201 is forward / reverse in one direction and the other direction around a rotation axis indicated by a dotted line K (same as the dotted line K shown in the drawings other than FIG. 15). It can be freely rotated in both directions.

(First addition step)
Next, the first addition step is performed. The heavy machine 201 rotates the inner shaft 21 around the rotation axis K in one direction, so that the apparatus 11 excavates the soil 301 (in the tip direction, here downward) and enters the soil 301. As described above, the excavating blades 91 (support members 92a and 92b, the excavating blade 93a, and the excavating blade 93b) and the stirring blade 95 are rotated in one direction when the outer shaft 51 rotates around the rotation axis (dotted line K). It has an action of excavating the soil 301 and entering the soil 301, and an action of retreating from the soil 301 in the other direction of rotation. In the first addition step, the outer shaft 51 is also rotated in the one direction by rotating the inner shaft 21 in the one direction around the rotation axis K, and the apparatus 11 enters the soil 301. The additive (for example, cement milk) added to the soil 301 is pumped and supplied to the internal flow path 31 while the apparatus 11 is rotated in the one direction to enter the soil 301. The additive supplied to the proximal end side of the internal flow path 31 flows through the internal flow path 31 toward the distal end side. At this time, the rotational position of the outer shaft 51 relative to the inner shaft 21 is the first rotational position ( 11 to 14), the first inner discharge port 27h1 communicates with the first receiving port 59a, but the second inner discharge port 27h2 does not communicate with the second receiving port 59b. Therefore, the additive flows in the order of the internal flow path 31, the first inner discharge port 27h1, and the first receiving port 59a, and is discharged toward the soil 301 from the first outer discharge port 57a. The additive discharged from the first outer discharge port 57a toward the soil 301 is then well stirred and mixed with the surrounding soil 301 by the rotating excavation blades 91 (here mainly the support members 92a and 92b) and the stirring blades 95. (The free rotating blade 97 prevents the surrounding soil 301 from co-rotating with the excavating blade 91 and the stirring blade 95, so that the additive and the soil 301 can be stirred and mixed well.)
When the device 11 is rotated in the one direction and enters the soil 301, the rotation position of the outer shaft 51 with respect to the inner shaft 21 is in the first rotation position (that is, FIGS. 11 to 14). When the heavy machine 201 rotates the inner shaft 21 in the one direction, the outer shaft 51 receives friction and resistance (a force in a direction not to rotate in the one direction) from the soil 301 existing around the outer shaft 51, and the friction. The rotation position of the outer shaft 51 relative to the inner shaft 21 becomes the first rotation position (rotation limit) due to the resistance.
Thus, the first addition step of discharging the additive from the first outer discharge port 57a and adding it to the soil 301 is completed while rotating the inner shaft 21 around the rotation axis K in the one direction and entering the soil 301. The result is shown in FIG.

(Second addition step)
Then, the second addition step is performed. 15B after the first addition step is completed, the inner shaft 21 is rotated around the rotation axis K in the other direction (that is, the direction opposite to the first addition step) and retreats with respect to the soil 301 ( The additive is discharged from the second outer discharge port 57b while moving in the proximal direction (upward here). As described above, the excavation blades 91 (support members 92a, 92b, excavation blades 93a, excavation blades 93b) and the stirring blades 95 are soiled when the outer shaft 51 rotates in the other direction around the rotation axis (dotted line K). In the second addition step, by rotating the inner shaft 21 in the other direction around the rotation axis K, the outer shaft 51 is also rotated in the other direction, so that the apparatus 11 is soiled. Retract from 301. The additive to be added to the soil 301 is pumped and supplied to the internal flow path 31 while the apparatus 11 is rotated in the other direction and retracted from the soil 301. The additive supplied to the proximal end side of the internal flow path 31 flows through the internal flow path 31 toward the distal end side. At this time, the rotational position of the outer shaft 51 relative to the inner shaft 21 is the second rotational position ( In other words, the second inner discharge port 27h2 communicates with the second receiving port 59b, but the first inner discharge port 27h1 communicates with the first receiving port 59a. Absent. Therefore, the additive flows in the order of the internal flow path 31, the second inner discharge port 27h2, and the second receiving port 59b, and is discharged toward the soil 301 from the second outer discharge port 57b. The additive discharged from the second outer discharge port 57b toward the soil 301 is then well stirred and mixed with the surrounding soil 301 by the rotating stirring blade 95 and the excavating blade 91 (the surrounding soil by the free rotating blade 97). 301 is prevented from co-rotating with the excavating blades 91 and the stirring blades 95, and the additive and the soil 301 can be well stirred and mixed.
When the device 11 is rotated in the other direction and retracted with respect to the soil 301, the rotation position of the outer shaft 51 relative to the inner shaft 21 is the second rotation position (that is, the state shown in FIGS. 3 to 6). ) Is that when the heavy machine 201 rotates the inner shaft 21 in the other direction, the outer shaft 51 receives friction and resistance from the soil 301 existing around the outer shaft 51 (a force in a direction not to rotate in the other direction). Accordingly, the rotational position of the outer shaft 51 with respect to the inner shaft 21 becomes the second rotational position (rotation limit) due to the friction and resistance.
Thus, while rotating the inner shaft 21 in the other direction around the rotation axis K and retreating with respect to the soil 301 (base end direction, here upward), the additive is discharged from the second outer discharge port 57b and the soil The middle of the second addition step added to 301 is shown in FIG. 15 (c), and the end of the second addition step is shown in FIG. 15 (d). As described above, the soil 303 mixed with the additive can be formed.

Thus, if this apparatus 11 is used, an additive can be well stirred and mixed and added to the soil 301.
In particular, when the apparatus 11 adds the additive while excavating the soil 301 (front end direction, here downward), the additive is removed from the first outer discharge port 57a existing on the front end side (here lower side). In the case where the additive is added while being discharged toward the soil 301 and moving backward (base end direction, here upward) with respect to the soil 301, the additive is supplied to the soil 301 from the second outer discharge port 57 b existing on the base end side. In any case, the additive discharged toward the soil 301 is then well stirred and mixed with the surrounding soil 301 by the rotating stirring blade 95 and the excavating blade 91 (free rotating blade). 97 prevents the surrounding soil 301 from co-rotating with the excavating blade 91 and the stirring blade 95, and the additive and the soil 301 can be well stirred and mixed.)
Furthermore, since the soil 303 mixed with the additive is mixed with the additive twice by the first addition step and the second addition step, the additive is mixed evenly.

  As described above, the present apparatus 11 excavates and / or excavates the soil 301 and the rotation outer surface (the side surface 27a of the substantially right circular cylindrical fitting portion 27) forming at least a part of the rotation surface about the rotation axis K. Alternatively, it is formed on the outer flow path (side surface 27a of the fitting portion 27) so as to communicate with the internal flow path 31 through which the additive added to the soil flows when stirring, and the internal flow path 31 as the flow path. The inner shaft 21 having the inner discharge ports (first inner discharge port 27h1 and second inner discharge port 27h2) and the rotary blades (excavation blades 91, stirring blades 95) for excavating and / or stirring the soil 301. A hollow that is attached to the outer surface and is externally fitted to the inner shaft 21 so as to be rotatable around the rotation axis K within a predetermined range (here, a range between the first rotation position and the second rotation position). The outer shaft 51 of the rotating surface about the rotation axis K. A rotating inner surface (an inner surface defining the inner space 53 of the outer shaft 51 forms a rotating inner surface which forms at least a part and faces the rotating outer surface (side surface 27a of the fitting portion 27). The first outer surface 59a and the second second inlet 59b formed on the outer surface so as to communicate with the first outer port 59a. The outer shaft 51 having a discharge port 57a and a second outer discharge port 57b formed so as to communicate with the second receiving port 59b on the outer surface distant from the rotation axis K direction. In one direction of the predetermined range in which the outer shaft 51 can rotate relative to the inner shaft 21 (here, the range between the first rotational position and the second rotational position). At the first rotation position that is the limit, the inner discharge port (first inner discharge) 27h1, the second inner discharge port 27h2) and the first receiving port 59a communicate with each other and the inner discharge port (the first inner discharge port 27h1, the second inner discharge port) at the second rotational position which is the limit in the other direction. 27h2) and the second receiving port 59b are communication devices for discharging additives to the soil 301.

In the present apparatus 11, the inner discharge port (first inner discharge port 27h1, second inner discharge port 27h2) is connected to the first inner discharge port 27h1 communicating with the first receiving port 59a at the first rotation position. The second inner discharge port 27h2 communicates with the second receiving port 59b at the second rotation position.
Further, in the first rotation position, the protruding portion 29 (29a, 29b) which is the first rotation restriction inner portion of the inner shaft 21 is a notch 55a which is the first rotation restriction outer portion of the outer shaft 51. 55b (the surface of the outer shaft 51 defining the outer surface 51b) prevents the outer shaft 51 from further rotating in the one direction with respect to the inner shaft 21, and in the second rotation position. The protrusion 29 (29a, 29b), which is the second rotation restriction inner part of the inner shaft 21, has notches 55a, 55b (the second rotation restriction outer part of the outer shaft 51). The outer shaft 51 is prevented from further rotating in the other direction with respect to the inner shaft 21.
In addition, at least a part of the rotary blades (excavating blade 91, stirring blade 95) exists between the first outer discharge port 57a and the second outer discharge port 57b.
Further, the rotating outer surface (the side surface 27a of the fitting portion 27) and the rotating inner surface (the inner surface defining the inner space 53 of the outer shaft 51) are substantially formed by the side surface of a right circular cylinder with the rotation axis K as an axis. .
In addition, when the inner shaft 21 is rotated in one direction around the rotation axis K, the outer shaft 51 is unidirectionally positioned with the outer shaft 51 positioned at the first rotation position with respect to the inner shaft 21. , And the rotating blades (excavating blade 91, agitating blade 95) attached to the outer shaft 51 have a function of excavating the soil 301 and entering the soil 301, and the other direction around the rotation axis K. When the inner shaft 21 is rotated, the outer shaft 51 is rotated in the other direction in a state where the outer shaft 51 is located at the second rotation position with respect to the inner shaft 21, and the rotation attached to the outer shaft 51. The blades (excavation blades 91, stirring blades 95) have a function of retreating from the soil 301, and the first outer discharge port 57a is positioned in the excavation direction (tip direction) than the second outer discharge port 57b. .
The method of using the device 11 described above with reference to FIG. 15 is a method of adding an additive to the soil 301 using the device 11, and the inner shaft 21 is unidirectionally around the rotation axis K. The first addition step of discharging the additive from the first outer discharge port 57a while rotating the soil 301 and rotating the inner shaft 21 in the other direction around the rotation axis K to rotate the inner shaft 21 with respect to the soil 301 A second addition step of discharging the additive from the second outer discharge port 57b while retreating, and an additive addition method to the soil.
In addition, this apparatus 11 is used similarly to the stirring head 11 in the ground improvement apparatus and ground improvement construction method described in Patent Document 1 described above.

It is a front view which shows the additive discharge apparatus (this apparatus) to the soil of this invention. It is a right view which shows this apparatus. FIG. 2 is an AA end view of FIG. 1 (second rotation position). It is a BB end view of Drawing 1 (the 2nd rotation position). It is CC end view of FIG. 1 (2nd rotation position). It is a partial end view which shows the part containing an inner shaft, an outer shaft, and a front-end | tip member among the EE end surfaces of FIG. 1 (2nd rotation position). It is a front view of an inner shaft. The right side view of the inner shaft (FIG. 8A) and the end view of FIG. 7 (FIG. 8B are FF end views of FIG. 7, and FIG. 8C is the GG end face of FIG. FIG. 8D is an HH end view of FIG. 7. It is sectional drawing of an outer shaft. It is a top view of an outer shaft. FIG. 2 is an AA end view of FIG. 1 (first rotation position). FIG. 2 is a BB end view of FIG. 1 (first rotation position). It is CC end view of FIG. 1 (1st rotation position). It is a partial end view which shows the part containing an inner shaft, an outer shaft, and a front-end | tip member among the EE end surfaces of FIG. 1 (1st rotation position). It is a partial cross section figure which shows the usage method of this apparatus.

Explanation of symbols

11 This apparatus 21 Inner shaft 23 Connection part 23a Substantially frustoconical part 23b1, 23b2 Concave groove 25 Collar part 27 Insertion part 27a Side surface 27d Screw hole 27h1 First inner discharge port 27h2 Second inner discharge port 29, 29a, 29b Projection part 31 internal flow path 51 outer shaft 53 internal space 55a, 55b notch 57a first outer discharge port 57b second outer discharge port 59a first receiving port 59b second receiving port 61 outer 63a first lubricating hole 63b second lubricating hole 65 Free rotating blade support portion 65a First ring portion 65b Second ring portion 65c Tube portion 81 Tip member 83 Disc portion 85 Projection portion 91 Excavation blade 92a, 92b Support member 93a, 93b Excavation blade 94 Angle 95 Stirring blade 95a1, 95a2 Tip side Stirrer blades 95b1, 95b2 Base end side agitator blades 97 Free rotating blades 97a Outer fitting tube portion 9 ah opening 97b, 97c vane body 101a, 101b, 103 angle 201 soil which is stirred and mixed with heavy equipment 301 Soil 303 additive

Claims (9)

A rotating outer surface that forms at least a part of a rotating surface with the rotating shaft as an axis, a flow path for flowing an additive added to the soil when excavating and / or stirring the soil, and the flow path communicating with the flow path An inner shaft having an inner discharge port formed on the rotating outer surface and a connection portion located on the base end side and connected to a heavy machine or the like,
A rotary outer shaft is attached to an outer surface for excavating and / or agitating soil, and is a hollow outer shaft that is externally fitted to the inner shaft so as to be rotatable within a predetermined range around the rotating shaft. A first receiving port and a second receiving port formed on the rotating inner surface facing at least a part of the rotating surface and facing the rotating outer surface, and a first formed on the outer surface so as to communicate with the first receiving port. An outer shaft having an outer discharge port and a second outer discharge port formed so that the first outer discharge port communicates with the second receiving port on the outer surface separated in the rotational axis direction;
With
Of the rotational positions of the outer shaft relative to the inner shaft, the inner discharge port and the first receiving port communicate with each other at the first rotational position that is the limit in one direction of the predetermined range in which the outer shaft can rotate. The inner discharge port and the second receiving port communicate with each other at a second rotation position,
By rotating the inner shaft in one direction around the rotation axis, the outer shaft rotates in one direction with the outer shaft positioned at the first rotation position with respect to the inner shaft, and around the rotation axis. When the inner shaft is rotated in the other direction, the outer shaft is rotated in the other direction while the outer shaft is positioned at the second rotation position with respect to the inner shaft.
Additive discharge device to soil.   The additive discharging apparatus to soil according to claim 1, further comprising a free rotating blade supported by an outer shaft so as to be rotatable around the rotating shaft.   The additive discharging apparatus for soil according to claim 2, wherein the free rotating blade is rotatably supported on the outer surface of the outer shaft between the first outer discharge port and the second outer discharge port.   The inner discharge port has a first inner discharge port that communicates with the first receiving port at the first rotation position and a second inner discharge port that communicates with the second reception port at the second rotation position. The additive discharge apparatus to the soil of any one of Claims 1 thru | or 3 which is these. In the first rotation position, the first rotation restriction inner portion of the inner shaft contacts the first rotation restriction outer portion of the outer shaft, so that the outer shaft moves in the one direction with respect to the inner shaft. Further, it is prohibited to rotate,
In the second rotation position, the second rotation restriction inner portion of the inner shaft abuts on the second rotation restriction outer portion of the outer shaft, so that the outer shaft moves in the other direction with respect to the inner shaft. Furthermore, the additive discharge apparatus to the soil of any one of Claim 1 thru | or 4 which prohibits rotating.   The additive discharge device to soil according to any one of claims 1 to 5, wherein at least a part of the rotor blade is present between the first outer discharge port and the second outer discharge port.   The additive discharging apparatus to soil according to any one of claims 1 to 6, wherein the rotating outer surface and the rotating inner surface are formed by side surfaces of a right circular cylinder having the rotating shaft as an axis. By rotating the inner shaft in one direction around the rotating shaft, the outer shaft rotates in one direction with the outer shaft positioned at the first rotation position with respect to the inner shaft, and is attached to the outer shaft. The rotor blades have a function of excavating the soil and entering the soil,
By rotating the inner shaft in the other direction around the rotating shaft, the outer shaft is rotated in the other direction with the outer shaft positioned at the second rotation position with respect to the inner shaft, and is attached to the outer shaft. The rotating blades have the action of retracting from the soil,
The additive discharge device to the soil according to any one of claims 1 to 7, wherein the first outer discharge port is located in the digging direction with respect to the second outer discharge port. A method of adding an additive to soil using the additive discharge device for soil according to claim 8,
A first addition step of discharging the additive from the first outer discharge port while rotating the inner shaft in one direction around the rotation axis and entering the soil.
A second addition step of discharging the additive from the second outer discharge port while rotating the inner shaft around the rotation axis in the other direction and moving backward with respect to the soil;
A method for adding additives to soil, comprising:

Images