JPH06212873A - Enlarging and excavating machine - Google Patents

Abstract

PURPOSE:To widen an enlarging blade so that enlargement and excavation can be made by a pile end, confirm such a state from the ground and surely withdraw the enlarging blade to an original state. CONSTITUTION:An excavating blade 12 is provided to a cylindrical shaft 11, and both upper and lower bits 1a and 1b divided into two parts so as to cross an excavation bit 1 forming an excavating blade 13, a connection joint 6 inserted to the insides of cylinders of the upper bit and lower bit, a guide shaft 7 freely inserted into a slot 115 formed in the cylindrical shaft 11 of the lower bit and fixed to the connection joint 6, an enlarging blade 3 mounted to the lower bit 1b and a link mechanism 4' connecting the guide shaft 7 and the enlarging blade 3 are provided to the lower end of the excavating blade 12. When the upper bit 1a is forwarded, both upper and lower bits maintain the shape of the excavating blade in a state prior to the division, and while the link mechanism 4' stores forcedly the enlarging blade 3 in the excavating blade, when the upper bit 1a is reversed, the enlarging blade 3 is projected outward of the excavating blade 12, and the guide shaft 7 is interlocked with the other end of the slot 115 in order to maintain a projection state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expanding digging device for constructing an expanding bulb in which a rooting solution is injected into a pile tip portion so as to develop a pile tip supporting force. Medium excavation root consolidation method,
It is used in industrial fields such as pre-boring root consolidation method.

[0002]

2. Description of the Related Art Conventionally, ready-made piles that have been driven by impact are transferred to a hole drilled in the ground to install with low noise and low vibration, or to an embedded pile method in which piles are installed while excavating the ground. Is coming. The embedded pile method is classified into the medium excavation method and the pre-boring method. Inside the pile, the pile tip is enlarged and cement milk, etc. is injected to build the enlarged bulb, and the pile and the support ground are integrated. There is a construction method in which the tip support force is developed by doing this. As an enlarged excavating bit used for such a method of enlarging the tip of the pile, there have been known those disclosed in Japanese Utility Model Publication No. 1-79692, Japanese Patent Publication No. 3-61833, etc.

[0003]

However, the above-mentioned enlarged drill bit has a structural problem that the enlarged blade does not open sufficiently or that the enlarged blade does not retract to its original state after completion of the enlarged excavation. . For example, the actual Kaihei 1-79692
According to the publication, despite the structure in which the expansion blade is retracted by the earth pressure resistance, the earth pressure resistance inside the excavation hole expanded at the time of ending the expansion excavation has already weakened, so I didn't return to the state. For this reason, when pulling up the expanded drilling bit, there was a problem such as collapsing the hole wall. Further, it is difficult to confirm whether or not the enlarged bulb portion is actually formed by the enlarged excavation, which is one of the drawbacks of the root consolidation method.

The present invention overcomes the above-mentioned problems, and not only makes it possible to open the expanding blade so that the tip of the pile can be expanded and excavated, but also to confirm this state from the ground. An object of the present invention is to provide an expanding excavating device capable of reliably retracting the expanding blade to the original state after forming the portion.

[0005]

The enlarged excavating device of the first aspect of the present invention comprises an excavating blade provided around a cylindrical axis and is divided into two so as to traverse an excavating bit having an excavating blade formed at the lower end of the excavating blade. An upper and lower bit, a hollow joint that rotatably joins the upper bit and the lower bit to each other, an enlarged blade that is rotatably attached to a support shaft provided on a bracket of the upper bit or the lower bit, and rotation of the upper bit A projecting piece formed on one of the upper bit and the lower bit is provided with a link mechanism that connects one of the upper bit and the lower bit to the expanding blade so that the expanding blade swings. While the stopper provided on the other of the upper bit and the lower bit locks, the upper and lower bits hold the shape of the excavating blade before division, and the link mechanism forcibly stores the enlarged blade in the excavating blade, while the upper bit Is reverse Then, the linking mechanism causes the enlarged blade to project to the outside of the excavation blade, and the stopper that locks at least one of the protrusion and the enlarged blade is arranged on the upper bit or the lower bit so that the protruding state is maintained. It is characterized by being done. Here, "normal rotation" means the direction of rotation of the motor during excavation to the bottom (hereinafter referred to as "normal rotation"). The "reverse rotation" means the rotation direction of the motor when performing the enlarged excavation after the lower bit reaches the bottom (hereinafter referred to as "reverse rotation").

In the second aspect of the present invention, in the enlarged excavating device of the above-mentioned invention, a micro switch is provided in at least one of the upper and lower bits, the hollow joint, the link mechanism, and the stop piece, and the upper bit rotates forward to stop the protruding piece. At the time when the piece is locked, the micro switch is activated so that the completion of the projection of the enlarged blade is transmitted to the ground through the hollow portion of the cylindrical shaft and the screw rod.

Further, the third aspect of the present invention is to provide an upper and lower bit, which is divided into two so as to traverse an excavating bit in which an excavating blade is provided around a cylindrical axis and an excavating blade is formed at the lower end of the excavating blade.
A connection joint that rotatably joins the upper bit and the lower bit to each other, and is loosely inserted into a long hole formed in the cylindrical shaft side surface of the upper bit or the lower bit, and fixed to the connection joint,
A guide shaft configured to limit the range of rotation of the connection joint by such an elongated hole, an enlarged blade rotatably attached to a support shaft provided on a bracket of the upper bit or the lower bit, and rotation of the upper bit A link mechanism that connects the guide shaft and the enlarged blade so that the enlarged blade swings,
When the upper bit rotates in the normal direction, the guide shaft is locked at one end of the elongated hole, so that the upper and lower bits retain the shape of the excavating blade before division, and the link mechanism forcibly stores the enlarged blade in the excavating blade. On the other hand, when the upper bit reverses, the expanding blade projects to the outside of the excavating blade by this link mechanism, and the guide shaft is locked at the other end of the long hole to maintain the projecting state. And

A fourth aspect of the present invention is the expansion drilling apparatus according to the third aspect, wherein the upper and lower bits, the connection joint, the guide shaft,
A micro switch is provided on at least one of the link mechanisms, and when the guide shaft is locked at one end of the long hole by the normal rotation of the upper bit, this micro switch is activated to indicate that the expansion blade has finished protruding. It is designed to transmit to the ground via the hollow part of the shaft and screw rod. A fifth aspect of the present invention is the enlargement excavating device according to the first or third aspect of the invention, wherein the extension auxiliary blade is supported by a support shaft provided near the outer peripheral edge of the excavation blade.

[0009]

According to the first and second aspects of the present invention, when the screw rod of the excavator is rotated in the normal direction for excavation, the upper bit fixed to the screw rod also rotates in the normal direction. Then, assuming that a projecting piece is formed on the upper bit, when the projecting piece of the upper bit is locked by the stopper attached to the lower bit, the lower bit also starts to rotate together. Since this stopper aligns the upper and lower bits and forms the shape of the excavation blade before being divided, the excavation can be smoothly performed. When the stopper locks the protruding piece and the upper and lower bits rotate together, the link mechanism pulls the excavating blade attached to the lower bit so that it is forcibly stored in the excavating blade.
It does not interfere with the excavation.

On the other hand, when the lower bit reaches the digging bottom of a predetermined depth and enters the expanding digging to obtain the expanding bulb portion, the expanding digging device is temporarily lifted and dropped to the digging bottom. Now the lower bit sticks into the bottom. When this state is secured and the screw rod is reversed, the upper bit reverses. But,
Since the lower bit is stuck in the bottom of the drill, it cannot be followed and remains stopped. Therefore, the link mechanism causes the enlarged blade to project to the outside of the excavation blade. When the protrusion of the expansion blade is completed, the protruding piece or the expansion blade comes into contact with the stop piece provided on the lower bit. Here, a micro switch is attached to any of the upper and lower bits, the hollow joint, the link mechanism, and the stop piece, and when the micro switch is activated at the time of contact, the state is transmitted to the ground. You can confirm that the expansion blade has finished protruding. After forming the bulb part with the expanding blade, if you rotate the screw rod forward,
The upper bit also rotates forward. When the upper bit rotates forward, the link mechanism forcibly retracts the enlarged blade into the excavation blade.

Also in the case of the third and fourth inventions, the first and second
The same action as the invention works. According to such an enlarged excavator, the number of parts is small and the structure is simple. Further, in the expanding excavating device of the fifth invention provided with the expanding auxiliary blade, since the expanding auxiliary blade expands at the time of forward rotation and expands from the diameter of the excavating bit, it expands compared to the case of digging the expanded bulb portion with the expanding blade at once. The load on the blade is small.

[0012]

EXAMPLES The present invention will be specifically described below with reference to examples. (1) Example 1 a. Configuration of Enlarged Excavator FIG. 1 to FIG. 7 show an example of the enlarged excavator according to the first and second inventions. The expansion drilling device A includes a drilling bit 1 and
It is composed of a hollow joint 2, an enlarged blade 3, a link mechanism 4, a stopper 55, and stoppers 56 and 57.

The drill bit 1 has a cylindrical shaft 11 (outer diameter: 27).
An excavation blade 12 (excavation outer diameter D: about 690 mmφ) twisted about 180 degrees around 3φ, wall thickness: 30 mm) is formed, and an excavation blade 13 is provided at the lower end of this excavation blade. The excavation blade 12 is connected to the blade 91 at the lower end of the screw rod 9 (FIG. 7). This is for facilitating the upward discharge of the excavated soil by forward rotation (in this embodiment, right rotation). A blind plate is welded and fixed to the bottom of the cylindrical shaft 11 to form a bottomed cylinder.
There is an opening valve 111 having an opening formed near the lower end of the cylindrical shaft 11 and covered with a rubber packing. This is for preventing the excavated soil from entering during excavation, and for discharging the rooting liquid that has passed through the screw rod 9 after excavation to the excavated bottom.

Reference numeral 15 indicates a hexagonal joint. Screw rod 9 with spiral blades on a hollow pipe
Is to be joined with. The joint 15 is hollow and connects the cylindrical shaft 11 and the screw rod 9 to each other. The excavation bit 1 is cut so as to traverse at substantially the center and is divided into two parts, an upper bit 1a and a lower bit 1b (FIG. 1). But,
The upper bit 1a and the lower bit 1b have a configuration in which cut portions are joined by a hollow joint 2 (FIG. 6).

The hollow joint 2 is a tubular body and has annular grooves 21 and 21 formed on its side surfaces (FIG. 5). In such a hollow joint 2, the upper part is inserted into the cylindrical shaft 11 of the upper bit 1a and fixed by welding, while the lower part is inserted into the cylinder of the lower bit 1b,
Using the through hole 112 provided in the lower bit 1b, the bolt 11
The lower bit 1b is joined at 3 (FIG. 6). 6 bolts 1
13 engages the annular groove 21. In this way, the upper bit 1a and the lower bit 1b do not come off in the axial direction via the hollow joint 2 and are rotatably attached to each other with the hollow joint 2 as an axis.

Reference numeral 3 indicates a claw-shaped enlarged blade (FIG. 2).
Brackets 31, 31 are formed near the upper side of the lower bit 1b, and the enlarged blade 3 is rotatably attached to a support shaft 32 provided on the bracket (FIG. 4). In this embodiment, two enlarged blades 3 are arranged around the cylindrical shaft 11 at 180 ° intervals. Support shaft 32
When the enlarging blade 3 is rotated about, the minimum rotation outer diameter of the enlarging blade 3 is slightly less than 690 mmφ with the cylindrical shaft 11 as the center.
Since the enlarged blade 3 is curved in an arc shape, it can be accommodated within the outer diameter D of the excavation by the excavation blade 12 (FIG. 2). On the other hand, the maximum rotation outer diameter of the enlarged blade 3 with the cylindrical shaft 11 as the axis is about 1200 mmφ. At this time, the enlarged blade is a pile 8
It exceeds the outer diameter (about 1000 mmφ) and is in the most expanded state (Fig. 3).

The link mechanism 4 includes a cylindrical shaft 1 of the upper bit 1a.
One end of the lever 42 is rotatably attached to the projecting piece 41 formed at 1, and the other end of the lever 42 is attached to the support shaft 3 of the expansion blade 3.
It is composed of a mechanism that is axially attached to the overhanging portion 43 that is closer to the second side. When the upper bit 1a is normally rotated by the link mechanism 4, the enlarged blade 3 rotates left about the support shaft 32 (FIG. 2). Further, when the upper bit 1a is rotated in the reverse direction (in the present embodiment, it is referred to as left rotation), the enlarged blade 3 is configured to rotate right about the support shaft 32 (FIG. 3).

The stopper 55 is a cylindrical shaft 1 of the lower bit 1b.
1 is provided near the upper edge. The upper end of the stopper 55 has a shape protruding to the position of the protruding piece 41 formed on the upper bit 1a (FIG. 4). When the upper bit 1a rotates normally, the stopper 55 locks the protruding piece 41 of the upper bit 1a. The attachment position of the stopper 55 is set so that the enlarged blade 3 enters the excavation outer diameter D of the excavation blade 12 (FIG. 2). At this time, the upper bit 1a and the lower bit 1b, which are divided into two, are set so as to form the shape of the excavating blade before being divided (FIG. 1). In the present embodiment, the stopper 55 is attached at a position which is rotated approximately 90 degrees from the position of the bracket 31 (FIG. 4).

The stop pieces 56 and 57 are block pieces provided on the lower bit 1b (the stop piece 56 is omitted in FIG. 2). When the upper bit 1a is reversed, the protruding piece 41 and the enlarged blade 3
It is for locking the. Fix the lower bit 1b,
When the upper bit 1a is reversed, the link mechanism 4 causes the enlarged blade 3 to project to the outside of the excavation blade. In the most protruding state, the stop piece 56 projecting from the upper bit 1 a locks the projection piece 41, and the stop piece 57 provided near the support shaft 32.
Also has an arrangement configuration for locking the magnifying blade 3 (FIG. 3). If the mechanical strength is sufficient, either of the stoppers 56 and 57 may be omitted.

Reference numeral 561 indicates a limit type micro switch (FIG. 3). The micro switch 561 is attached to the stop piece 56 that comes into contact with the protruding piece 41. When the projecting piece 41 hits the microswitch 561 and the expanding blade 3 projects outward and is completed, a signal is transmitted so that a lamp is displayed on the operation panel of the ground operator. Micro switch 561
A board with a backup power supply (not shown) is incorporated in the vicinity. The detected radio wave signal is wirelessly transmitted to the ground by skipping through the hollow portion of the hollow joint 2, the cylindrical shaft 11, and the screw rod 9 that serves as a supply path of the root-cure solution from the stopper 56. In this embodiment, the stopper 55 also has a protruding piece 4
A micro switch 551 for notifying that 1 has come into contact is attached, and the display panel on the ground is also informed that the enlarged blade 3 is retracted.

B. Operation of Expanding Excavator The operation of the expanding excavator when the construction by the medium excavation and consolidation method is performed on the planned embedding site of the pile using the expander excavating device configured as described above (Figs. 7 to 9). Open-ended pile 8
The outer diameter is 1000 mmφ and the inner diameter is 740 mmφ. The pile tip ground is excavated through the hollow portion of the pile 8, and the pile body is sunk while discharging the excavated soil from the top of the pile.

First, the motor of the excavator is started to provide a pile hole, the screw rod 9 is normally rotated, and the excavation is carried out to a desired depth (FIG. 7). In this excavation process, the upper bit 1a fixed to the screw rod 9 also rotates normally.
Here, since the protrusion 41 of the upper bit 1a presses the stopper 55 of the lower bit 1b, the lower bit 1b to which the stopper 55 is fixed is also urged in the normal direction (FIG. 2). The external force to press is the upper bit 1a and the lower bit 1
b and acts as a force for maintaining the shape of the excavation blade before division.
Therefore, the excavated soil excavated by the excavating blade 13 is smoothly conveyed upward by the excavating blade 12. Furthermore, since the projecting piece 41 advances the excavation while pressing the stopper 55, the link mechanism 4 keeps the enlarged blade 3 in the state of being forcibly stored in the excavation blade 12. Therefore, a hole of about 690φ is dug without difficulty.

When the predetermined depth is reached, the next operation is started. The entire expansion digging device A is lifted to some extent and dropped. Then, the excavating blade 13 pierces the new tip ground 81 by its own weight (FIG. 8).

After that, the screw rod 9 is reversed. The lower bit 1b cannot follow this rotation due to the biting of the excavating blade 13 into the tip ground 81, and only the upper bit 1a reverses. Therefore, the link mechanism 4 causes the enlarged blade 3 to project to the outside of the excavation blade 12 (FIG. 4). Only the upper bit 1a is reversed until the stoppers 56 and 57 of the lower bit 1b lock the protrusion 41 and the enlarged blade 3, and the link mechanism 4 projects the enlarged blade 3. The stoppers 56 and 57 are the protrusions 41,
Where the expansion blade 3 is locked, the expansion blade 3 is about 1200 m
The drilling diameter is mφ (Fig. 3). At this time, the projecting piece 41 came into contact with the micro switch 561 provided on the stop piece 56 (FIG. 3), and the expanding blade 3 completely protruded outward because the hollow joint 2, the cylindrical shaft 11, the screw rod. It is transmitted using the hollow part of 9. It is displayed on the operation panel on the ground that it is in a state where it can be expanded and excavated.

Further, when the screw rod 9 is reversed,
Finally, the lower bit 1b cannot withstand, and the upper bit 1a
And then starts to reverse. In such a state, the enlarged bulb portion 82 larger than the diameter of the excavating bit (about 690 mmφ) is formed while reversing and moving up and down (FIG. 9). While the supporting ground is expanded and excavated by the protruding expansion blade 3, cement milk is sent from the ground. Cement milk, which is a rooting liquid, is discharged from the opening valve 111 via the screw rod 9, the upper bit 1a, the hollow joint 2, and the lower bit 1b.

When the predetermined enlarged bulb portion 82 is formed, the motor is switched to normal rotation. Then, the link mechanism 4 retracts the enlarged blade 3 into the excavation blade 12 (FIG. 2).
Should the upper and lower bits 1a and 1b rotate together, the excavation blade 12
If it is known from the panel display on the ground that it is not housed inside, the expansion excavator A is slightly lifted and then dropped, and the lower bit 1b is pierced into a new digging bottom. Next, when the motor is normally rotated, the upper bit 1a is normally rotated while the lower bit 1b is fixed, and thus the link mechanism 4 can forcibly store the enlarged blade 3 in the excavation blade 12.
Thus, when the expansion digging device A is pulled up to the ground, there is no problem of collapsing the hole wall or the like, and an expansion bulb that integrates the open-ended pile and the support ground is built.

(2) Embodiment 2 In this embodiment, the following enlarging auxiliary blade 121 is added to the enlarging excavator A of the first embodiment. That is, as shown in FIG. 10, after the excavation blade 12 of the lower bit 1b is notched at the outer peripheral edge in a claw shape, a support shaft 122 is provided at this notch portion, and an expansion assist suitable for the notched shape is provided on the support shaft 122. The blade 121 is attached. In the stationary state, the original shape of the excavation blade 12 is maintained. Enlarging auxiliary blade 121, lower bit 1b
The structure has a structure that expands when it rotates normally and receives earth pressure resistance. Then, the support shaft 112 is provided so that it can be excavated in the horizontal direction.
Above the above, a stop 119 consisting of a part of the excavation blade 12 is provided.
Are formed (FIG. 10). This is to prevent the enlarging auxiliary blade 121 from rising too high so that excavation can be performed in the horizontal direction.

The excavating operation of the enlarging excavator equipped with the enlarging auxiliary blade 121 is as follows. The basic operation is the same as that of the first embodiment, but in the pile 8, the auxiliary expansion blade 121 rotates while coming into contact with the inner wall of the pile even if it is normally rotated. However, once outside the piles, the auxiliary expansion blades 121 are subjected to earth pressure resistance and open horizontally by about 100 mm, respectively. The expansion of the expansion auxiliary blade 121 is added to the excavation by the excavation blade 13 and the excavation blade 12, and the friction cutter 83 (see FIG. 7).
Without using, the drilling hole corresponding to the pile diameter can be drilled down only by the expansion drilling device (Fig. 11). When the lower bit 1a reverses and rises, the expansion auxiliary blade 121 comes to be backed, and forms the original shape of the excavation blade 12. Therefore, when pulling up the expansion rig, etc.
There is no hindrance.

(3) Example 3 a. Configuration of Enlarged Excavator FIGS. 12 to 19 show an embodiment according to the third to fifth inventions. The expansion excavator A includes an excavation bit 1, a connection joint 6, a guide shaft 7, an expansion blade 3, and a link mechanism 4 ′.
Composed of and.

Like the second embodiment, the excavating bit 1 has the excavating blade 12 formed around the cylindrical shaft 11, and the excavating blade 13 is provided at the lower end of the excavating blade 12. Reference numeral 121 is an enlarged auxiliary blade 121, and reference numeral 15 is a hollow, hexagonal joint. The excavation bit 1 is cut so as to traverse at substantially the center and divided into two parts, an upper bit 1a and a lower bit 1b (FIG. 12). 18 is provided near the lower end of the cylindrical shaft of the upper bit 1a.
Two nozzles 114, 114 are formed at 0 degree intervals (see FIG.
3), the lid is covered with rubber packing, and internal pressure is applied to form an opening valve 118 that opens only outward. This is to prevent the excavated soil from entering during excavation, and to release the rooting liquid that has passed through the screw rod 9 to the excavated bottom after excavation. The upper bit 1a and the lower bit b have a structure in which cut portions are joined by a connection joint 6 (FIG. 13).

The connection joint 6 is a cylindrical body and is inserted into the cylindrical shaft 11 of the upper and lower bits 1a and 1b. The connection joint 6 is provided with a through hole 61 that is bifurcated from the upper surface to both side surfaces (FIGS. 13 and 14). The connection joint 6 is welded and fixed at its upper portion to the cylindrical shaft 11 of the upper bit 1a such that the through hole 61 and the hole of the nozzle 114 are aligned with each other (FIGS. 13 and 14).

The lower diameter of the connection joint 6 is reduced stepwise. Female screws 62, 62 are provided above this step.
Are formed at a pitch of 180 degrees (Fig. 14). Reference numeral 63 indicates an O-ring groove. Reference numeral 64 indicates a cap-shaped joint receiver which is placed in the cylindrical shaft 11 of the lower bit 1b with the concave portion facing upward (FIG. 13). When the connection joint 6 fixed by welding to the cylindrical shaft 11 is inserted into the cylindrical shaft 11 of the lower bit 1b, the bottom surface thereof abuts on the joint receiver 64, and a slight clearance E is provided between the upper and lower bits 1a and 1b.
To be joined together. This is because the sliding surface is the lower surface of the connection joint 6 to reduce the rotational resistance between the upper and lower bits. An O-ring (not shown) is fitted in the O-ring groove 63 to prevent foreign matter from entering the sliding surface.

Near the upper end of the cylindrical shaft 11 relating to the lower bit 1b, elongated holes 115, 11 that are horizontally long at intervals of 180 degrees.
5 are formed (FIGS. 14 and 15). The opening angle of the long hole 115 is about 75 degrees, and the opening length is 120 mm.
Reference numeral 7 indicates a guide shaft in an eyebolt form. The guide shaft 7 is loosely inserted in the long hole 115 and is screwed to the female screw 62 of the connection joint 6 (FIG. 14). Thus, the upper bit 1a and the lower bit 1b do not come off in the axial direction via the connection joint 6, and the guide shaft 7 is locked by the long hole 115, and the opening range (75) of the long hole is restricted.
It will be rotatably attached only within the range of.

Reference numeral 3 indicates a claw-shaped enlarged blade (see FIG. 1).
2). The enlarged blade 3 has a curved arc shape,
It can be accommodated within the outer diameter of the excavation created by (Fig. 16).
It is rotatably supported by a support shaft 32 provided on a bracket 31 of the lower bit 1b. Enlarging blade 3 is 2 at 180 degree intervals
Arrange individually.

In the link mechanism 4 ', one end of the lever 42 is rotatably attached to the guide shaft 7 screwed to the connection joint 6, and the other end of the lever 42 is extended toward the support shaft 32 of the expansion blade 3. It consists of a mechanism that is pivotally attached to the portion 43 (FIG. 16). When the upper bit 1a is normally rotated by the link mechanism 4 ', the enlarged blade 3 rotates counterclockwise about the support shaft 32 (Fig. 1).
6). Further, when the upper bit 1a is rotated in the reverse direction, the expanding blade 3 is configured to rotate right about the support shaft 32 (FIG. 1).
7).

Reference numerals 116 and 117 denote limit type micro switches. It is attached to the cylindrical shaft 11 at both ends of the long hole 115. When the upper bit 1a is rotated in the forward direction, the guide shaft 7 connected to the upper bit 1a hits the microswitch 116 to notify the ground operator that the expansion blade 3 has protruded outward and is completed. Send a signal and display it on the operation panel on the ground. The detected radio wave signal is wirelessly transmitted to the ground by skipping inside the hollow portion of the cylindrical shaft 11 and the screw rod 9 (FIG. 19). By the way, enlarged blade 3
When the blade protrudes outward and is completed, the enlarged blade 3 and the nozzle 114
And have a structure facing each other (Fig. 13). In the micro switch 117, the upper bit 1a is reversed and the expansion blade 3
It is for notifying that the is in a retracted state.

B. Operation of the expanding excavator The basic operation is substantially the same as that of the second embodiment. First, the screw rod 9 is normally rotated. In the pile 8, as shown in FIG. 12, when the expanding excavating device comes out under the pile, the expanding auxiliary blade 121 receives earth pressure resistance and opens. In this state, excavation is carried out to a desired depth. Enlarging auxiliary blade 121
By opening the hole, an excavation hole having a size of approximately the pile diameter can be obtained (FIG. 18).

When the predetermined depth is reached, the rotation of the screw rod 9 is stopped. Then, the entire expansion drilling device is lifted and dropped. Then, the excavating blade 13 pierces the new tip ground 81. After that, the screw rod 9 is reversed. Only the upper bit 1a reverses due to the lower bit 1b biting into the tip ground 81. With the reverse rotation of the upper bit 1a, the guide shaft 7 connected to the upper bit 1a
However, the expansion blade 3 is projected to the outside of the excavation blade 12 via the link mechanism 4 '(FIG. 19). Only the upper bit 1a is reversed until the guide shaft 7 is locked at one end of the elongated hole 115, and at the point where the guide shaft 7 is locked, the enlarged blade 3 has the maximum excavation diameter (FIG. 17). At this time, the guide shaft 7 contacts the micro switch 116. Then, the micro switch 116 operates to transmit that the expanding blade 3 has completely projected outward by utilizing the hollow portion of the cylindrical shaft 11 and the screw rod 9.

Further, when the screw rod 9 is reversed,
The lower bit 1b cannot withstand, and finally follows the upper bit 1a and also reverses the lower bit 1b. In this state, the screw rod 9 is reversed and the expansion excavator is moved up and down to form the expanded bulb portion 82 (FIG. 19). Since the excavation holes having the diameter of the pile have already been obtained by the expansion auxiliary blade 121, the force required by the expansion blade 3 for excavation is reduced as compared with the first embodiment.

While the support ground is expanded and excavated by the protruding expansion blade 3, cement milk is sent from the ground.
Cement milk is screw rod 9, upper bit 1a
It is discharged from the opening valve 118 via the cylindrical shaft 11, the through hole 61 of the connection joint 6, and the nozzle 114.

When the predetermined enlarged bulb portion 82 is formed, the screw rod 9 is switched to the normal rotation. Then, the guide shaft 7 retracts the enlarged blade 3 into the excavation blade 12 via the link mechanism 4 '. Here, since the direction of the opening valve 118 is aligned with the expanding blade 3 in the protruding state, when the cement milk is discharged, it also acts to wash the expanding blade 3 used to build the expanding bulb portion 82. Therefore, even if excavated soil or the like adheres to the enlarged blade 3, wash it away,
The enlarged blade 3 can be easily stored in the excavation blade 12. If it is known from the display panel on the ground that the upper and lower bits 1a and 1b are co-rotating, the same operation as in the first embodiment is performed.

(3) Effects of the embodiment When the expansion digging device according to the first embodiment is used for the buried pile construction, the expansion blade 3 can be reliably projected and retracted by the link mechanism 4, and the desired expansion can be achieved. Bulb part 8
Two formations could be made. Furthermore, since it was visible from the display panel on the ground whether the enlarged blade 3 was in the protruding state or in the retracted state, such a confirmation method was established, and it was found that it was an appropriate construction in the on-site inspection. . In addition, the microswitches 551 and 561 caught the positional information of the enlarged blade 3 and transmitted it to the ground, but since the inside of the hollow portion such as the cylindrical shaft 11 and the screw rod 9 into which the rooting liquid is injected is used, the barrier is It did not exist, and could be performed within the range of weak radio waves without being restricted by the Radio Control Law.

In addition, in Examples 2 and 3, the enlargement auxiliary blade 121
According to the expansion excavator provided with, it is not necessary to excavate while breaking the soil wall with the friction cutter 83, and in the process of advancing the conventional excavation method, the expansion auxiliary blade 121 scrapes an excavation area of about the pile diameter. I was able to. Since the expansion blade 3 is not dependent on excavation of all the expansion bulbs 82 and the load applied to the expansion blade is reduced, the screw rod 9
It was possible to reduce the size of the rotation drive source, and the construction could be done smoothly.

In the third embodiment, while the effects of the first and second embodiments are ensured, the bolts 113 which are the constituent parts are eliminated, so that once assembled, it is extremely difficult to disassemble the first and second embodiments.
Compared to 2, it is easier to assemble and disassemble. Further, since the parts such as the protruding piece 41 and the stop piece 56 are not necessary, the structure is simplified. Therefore, a small pile (eg 500 mm
It is possible to manufacture the expanded excavation device A up to about φ), and the applicable range of the embedded pile method using the device of the present invention is expanded. Further, after forming the enlarged bulb portion 82, when the lower bit 1b is rotated counterclockwise to close the enlarged blade 3, an aqueous solution of cement milk or the like blows off the adhered debris attached to the enlarged blade 3 from the opening valve 118 in advance. Because it is, it is easy to close.

The present invention is not limited to those shown in the above specific embodiments, but can be variously modified within the scope of the present invention depending on the purpose and application. For example, the expanding excavating device of the present invention may be used for a pre-boring tip expanding root consolidation method. The number of the enlarged blades 3 is not limited to that in the embodiment.

In the first embodiment, the cylindrical shaft 11 of the upper bit 1a
Stopper 5 provided on the lower bit 1b with the protruding piece 41 formed on
5 has a structure to be locked, but instead of this, the projecting piece 41 formed on the cylindrical shaft 11 of the lower bit 1b is attached to the upper bit 1.
The stopper 55 provided at a may be locked.
In the third embodiment, the connection joint 6 is connected to the upper bit 1a.
When the guide shaft 7 is loosely inserted into the elongated hole 115 formed on the side surface of the cylindrical shaft 11 of the lower bit 1b, and the guide shaft 7 is screwed into the connection joint 6, the elongated hole 115 is fixed. In order to limit the rotation range of the connection joint 6, instead of this, the connection joint 6 is fixed to the lower bit 1b, and the upper bit 1a is formed with a long hole 115 on the side surface of the cylindrical shaft 11. The guide shaft 7 is loosely inserted into the long hole 115, and the guide shaft 7 is screwed to the connection joint 6.
You may make it limit the rotation range of.

In this embodiment, the enlarged blade 3 is the lower bit 1b.
Installed on. This is because the enlarged bulb portion 82 can be built up to near the bottom of the ground. However, when the enlarged bulb portion 82 is higher than the height of the lower bit 1b, the enlarged blade 3 is moved to the upper bit 1
It may be attached to a. This is because the enlarged bulb portion 82 is not formed in the vicinity of the bottom and the effect of developing the tip end supporting force is reduced, but the influence is reduced.

Further, micro switches 551 and 561
Can use magnetic force or the like in addition to the limit method. The mounting positions of the micro switches 551 and 561 are the stopper 5
5, not only the stop piece 56, but any place of the upper and lower bits 1a, 1b, the hollow joint 2, and the ring mechanism 4, and it suffices that the projection piece 41 works when the stop piece 56 is locked. . Similarly, the mounting positions of the microswitches 116 and 117 are not limited to the cylindrical shaft 11, but may be any of the upper and lower bits 1a and 1b, the connection joint 6, the guide shaft 7, and the ring mechanism 4 '.

Transmission to the display panel on the ground is not limited to radio waves, and wireless using infrared rays or the like, or wiring may be laid. The display on the operation panel of the ground operator includes not only visual display but also auditory display.

[0050]

As described above, when the expanding excavating device of the present invention is used, when the bulb portion is formed at the tip of the pile, the expanding blade is surely projected, and after forming the expanding bulb portion, the expanding blade is restored to the original shape. Not only is it a mechanism that can be reliably retracted to the state,
Since a system that can confirm this from the ground has been established, it has a great effect on improving work efficiency and quality of construction management.

[Brief description of drawings]

FIG. 1 is a front view of an enlarged excavating device according to a first embodiment.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an explanatory cross-sectional view showing a state where an enlarged blade protrudes in FIG.

FIG. 4 is an enlarged view around the link mechanism of FIG. 1.

FIG. 5 is an enlarged perspective view of the hollow joint according to the first embodiment.

FIG. 6 is an enlarged view showing a mounting state of the upper and lower bits and the stopper in the first embodiment.

FIG. 7 is an explanatory diagram of a state in which the bottom of the excavating device is excavated by the excavating device of the first embodiment with the excavating bit.

FIG. 8 is an explanatory diagram of a state in which the excavating blade has pierced a new tip ground in the first embodiment.

FIG. 9 is a state explanatory view of the expanding excavator in which the expanding blade is projected in the first embodiment.

FIG. 10 is a front view of an enlarged excavating device according to a second embodiment.

FIG. 11 is an explanatory diagram showing a state in which the excavation bit is excavated to the excavated bottom by the enlarged excavation device of the second embodiment.

FIG. 12 is a front view of an enlarged excavating device according to a third embodiment.

13 is an enlarged view around the link mechanism of FIG.

FIG. 14 is an exploded front view around a connection joint according to a third embodiment.

FIG. 15 is an exploded plan view around a connection joint according to a third embodiment.

16 is a sectional view taken along line YY of FIG.

FIG. 17 is an explanatory cross-sectional view showing a state where the enlarged blade protrudes in FIG. 16.

FIG. 18 is an explanatory diagram showing a state in which the bottom of the excavation is excavated with the excavation bit by the enlarged excavation device of the third embodiment.

FIG. 19 is a state explanatory view of the expanding excavator in which the expanding blade is projected in the first embodiment.

[Explanation of symbols]

 1 Excavation Bit 11 Cylindrical Shaft 115 Long Hole 116 Micro Switch 117 Micro Switch 12 Excavation Blade 121 Expansion Auxiliary Blade 122 Spindle 13 Excavation Blade 1a Upper Bit 1b Lower Bit 2 Hollow Joint 3 Expansion Blade 31 Bracket 32 Spindle 4 Link Mechanism 4 ' Link mechanism 41 Projection piece 55 Stopper 551 Micro switch 55 Stopper 56 Stop piece 561 Micro switch 57 Stop piece 6 Connection joint 7 Guide shaft 9 Screw rod A Expanding excavator

Claims (5)

[Claims] 1. An upper and lower bit (1a), (1b) which is divided into two so as to traverse an excavating bit (1) provided with an excavating blade around a cylindrical axis and having an excavating blade formed at the lower end of the excavating blade.
A hollow joint (2) that rotatably joins the upper bit and the lower bit to each other; an enlarged blade (3) rotatably attached to a support shaft provided on a bracket of the upper bit or the lower bit; A link mechanism (4) is provided for connecting one of the upper bit and the lower bit to the expanding blade so that the expanding blade swings when rotated, and when the upper bit rotates forward, the upper bit and the lower bit are The protruding piece formed on one side is locked by the stopper provided on the other of the upper bit and the lower bit, and the upper and lower bits hold the shape of the excavating blade before division, and the link mechanism described above causes the enlarged blade to move inside the excavating blade. When the upper bit is reversely rotated while being forcibly stored, the link mechanism causes the expansion blade to project to the outside of the excavation blade, and a stopper that locks at least one of the protrusion and the expansion blade so that the projection state is maintained. Characterized by placing pieces Expanding excavation equipment. 2. The device according to claim 1, wherein at least one of the upper and lower bits, the hollow joint, the link mechanism, and the stop piece is provided with a microswitch, the upper bit rotates forward, and the stop piece engages the projecting piece. At the time of stopping, the microswitch is activated to confirm that the protrusion of the expanding blade is completed,
An enlarged excavating device configured to transmit to the ground via the hollow portion of the screw rod. 3. Upper and lower bits (1a), (1b) which are divided in two so as to traverse an excavation bit (1) provided with an excavation blade around a cylindrical axis and an excavation blade formed at the lower end of the excavation blade.
And a connection joint (6) for rotatably joining the upper bit and the lower bit to each other, and a connection joint (6) loosely inserted into a long hole formed on the side surface of the cylindrical shaft of the upper bit or the lower bit and fixed to the connection joint. A guide shaft (7) configured to limit the rotation range of the connection joint by a hole, an enlarged blade (3) rotatably attached to a support shaft provided on a bracket of the upper bit or the lower bit, and an upper bit of the upper bit. A link mechanism (4 ') that connects the guide shaft and the expanding blade is provided so that the expanding blade swings by rotation, and when the upper bit rotates forward, the guide shaft is locked at one end of the elongated hole. As a result, the upper and lower bits hold the shape of the excavating blade before division, and the link mechanism forcibly stores the expanding blade in the excavating blade, while the upper bit rotates in the reverse direction, the expanding blade causes the expanding blade to move toward the excavating blade. Projecting outwards, Larger rigs which the guide shaft to retain was state is characterized by being configured as locked at the other end of the elongated hole. 4. The device according to claim 3, wherein at least one of the upper and lower bits, the connection joint, the guide shaft, and the link mechanism is provided with a micro switch, and the guide shaft is connected to one end of the long hole by the forward rotation of the upper bit. An expanding excavator which is configured to activate the microswitch at the time of being locked, and to transmit to the ground that the projection of the expanding blade is completed through the hollow part of the cylindrical shaft and the screw rod. 5. The expanding excavating device according to claim 1, wherein the expanding auxiliary blade is supported by a spindle provided near the outer peripheral edge of the excavating blade.