JP2001098548A - Piler auger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform preceding excavation without using a large-scale machine by adopting a construction method such as pressing in a sheet pile after performing the preceding excavation by a spiral drill. SOLUTION: An auger motor 14 and a swivel 15 are arranged on a base 33, a chuck device 32 is provided on the base 33 for detachably installing this base 33 in an upper end part of a steel sheet pile 11, a rod 31 is connected to the swivel 15, the rod 31 extends up to the lower end of the steel sheet pile 11, a lower end part is rotatably journalled to the steel sheet pile 11 by a fixing band 21, a rotary cutter 19 is installed in a lower end of the rod 31, and a lifting device 40 is provided for lifting the auger motor 14, a rod 17 and the rotary cutter 19 in the vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piler auger used for press-fitting a steel sheet pile with a piler, and more particularly to a pile auger which is easy to press-fit in a hard ground such as a ground containing cobblestones or sand and gravel. This is related to a piler auger for performing pre-digging.

[0002]

2. Description of the Related Art In order to reinforce the ground at a construction site or to cut off water in rivers and marshes, construction is being carried out by continuously driving steel sheet piles into a wall into a base. In order to reduce the noise and the vibration when the steel is driven into the ground, a method using a press-fit type pillar has conventionally been adopted.

FIG. 10 is a schematic diagram of a press-fit type piler, in which a piler 2 is fixed on an already pressed steel sheet pile 1, and a hydraulic cylinder 5 is used while holding a steel sheet pile 3 to be press-fitted in a chuck portion 4. It is pressed into the ground.

[0004]

The above-mentioned piler 2
In the case of soft ground, there is no problem. However, in the case of hard ground such as ground containing cobblestones or gravel, it is impossible to push steel sheet pile 3 while crushing cobblestones or gravel with only the pressure of hydraulic cylinder 5. There was a case. For this reason,
A method has been adopted in which excavation is first performed in auger machines with a spiral drill (not shown) such as a screw, and then a sheet pile is pressed. However, if such advance digging is performed, a machine for that purpose must be prepared, and there is a problem that it takes time and effort.

Therefore, a method has been attempted in which a small spiral auger, such as a boat drill, is attached to a sheet pile to perform pre-digging and press-fitting work. However, even in the case of a piler having such a spiral auger, since the tip is not fixed, there is a problem that the auger escapes due to a cobblestone, sand and gravel, etc., which makes it impossible to dig straight ahead. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a pillar auger in which an auger can be excavated straight ahead and a steel sheet pile can be pressed into even a hard ground. The purpose is to provide.

[0007]

In order to achieve the above object, a pillar auger of the present invention has an auger motor provided on a base, and the base is detachably attached to an upper end of a steel sheet pile. A rod is connected directly or indirectly to the auger motor, the rod extends to the lower end of the steel sheet pile, the lower end is rotatably supported by the steel sheet pile with a fixed band, and a cutting tool for excavation is attached to the lower end of the rod. Is attached.

[0008] With the above configuration, by driving the auger motor and rotating the excavating blade through the rod, advance excavation can be performed and the work of press-fitting the steel sheet pile can be easily performed. Moreover, since the lower end of the rod is rotatably supported on the steel sheet pile by the fixed band, the cutting tool does not escape during the pre-digging. Further, the pillar auger of the present invention,
An auger motor and a swivel are connected in series and fixed to a base, and a rod is connected to the swivel.

With the above structure, high-pressure water or bentonite is introduced from the swivel and injected from the rear end of the rod to soften the hard ground, thereby facilitating the press-in operation of the steel sheet pile.
Further, the pillar auger of the present invention includes an elevating device that elevates and lowers the auger motor and the rod in the vertical direction.
The preceding excavation can be dug deep by the elevating device having the above configuration.

[0010] In the pillar auger of the present invention, the cutting tool for excavation is a rotary cutter having a flat triangular shape, and the width of the rotary cutter is smaller than the width of the steel sheet pile. According to the above configuration, the rotary blade can be pulled up along the steel sheet pile after performing pre-digging. Further, in the pillar auger of the present invention, an auxiliary blade larger than the width of the steel sheet pile is attached to the upper part of the rotary blade. With the auxiliary blade having the above-described configuration, the steel sheet pile can be easily press-fitted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. 1 is a top side view of a pillar auger of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a front view of a lower end of the pillar auger, and FIG. FIG.

As shown in FIGS. 1 and 2, the pillar auger 10 is detachably attached to the upper end of a steel sheet pile 11 through a chuck device 12. That is, this pillar auger 10 has an auger motor 14 and a swivel 15 connected in series and fixed to a long base 13 having a U-shaped cross section, and a joint 1 is attached to the lower end of the swivel 15.
A rod 17 extending to the lower end of the steel sheet pile 11 is connected to the steel sheet pile 11 through the rotary member 6, and a rotary blade 19 is attached to a tip of the rod 17.

The auger motor 14 is for rotating the rotary blade 19 at the tip of the rod 17, and is rotated by hydraulic pressure. A swivel 15 connected to a lower portion of the auger motor 14 injects high-pressure water, bentonite, or the like from the lower end of the rod 17 to soften the ground and facilitate the press-fitting of the steel sheet pile 11. Reference numeral 20 denotes a water inlet for introducing high-pressure water, bentonite, or the like from a jet pump (not shown). The upper end of the rod 17 is connected to the rotation shaft of the swivel 15 via the joint 16 as described above. The rod 17 has a hollow inside, and serves to guide the high-pressure water and bentonite introduced from the swivel 15 to the lower end of the rod and to transmit the torque of the auger motor 14 to the rotary blade 19. .

The lower end of the rod 17 is shown in FIGS.
Are rotatably supported by a fixed band 21 as shown in FIG. The fixed band 21 is obtained by welding both ends of an Ω-shaped metal plate to the lower end of the steel sheet pile 11. After the steel sheet pile 11 is press-fitted and the pillar auger 10 is removed from the sheet pile 11, the fixing blade 21 is torn by the rotary blade 19. Notches 2
2 are formed.

A valve 23 is attached to the lower end of the rod 17 and is closed so that mud and stones do not enter the rod 17 when high-pressure water is not sprayed from the nozzle. The joint 16 has an upper part 16a and a lower part 16b.
Are fitted with each other and connected by a pin 16c, so that the torque of the auger motor 14 can be transmitted to the rod 17 and high-pressure water or bentonite can be passed therethrough. Can be separated.

The rotary blade 19 attached to the tip of the rod 17 comprises a blade 19a and a fixed plate 19b.
a is made of a hard steel plate, the lower end side is an obtuse isosceles triangle, and the fixing plate 19b is applied from the back side,
The rod 17 is fixed by sandwiching the tip thereof. In addition,
On the isosceles part of the rotary blade 19, four protruding blades 19c protruding downward are formed.

The width of the rotary blade 19 is smaller than the flat portion 11a of the steel sheet pile 11 having a U-shaped cross section.
Up and down along the flat plate portion 11a. Near the lower end of the rotary blade 19, there is an opening of a nozzle portion 17a for injecting high-pressure water or bentonite, and high-pressure water introduced from the swivel 15 is ejected from the nozzle portion 17a through the rod 17.

The chuck device 12, as shown in FIG.
A holding body 24 having a U-shaped cross section is attached to the base 13, and the upper part of the steel sheet pile 11 is held by an expander 25. The expander 25 is attached to the center of the inner wall of the base 13 surrounded by the holding body 24, the movable claw 25a retreats in the horizontal direction, and a spring interposed between the fixed portion 25b and the movable claw 25a. The tip of the movable claw 25a is pressed against the sheet pile 11 by 25c, and the base 13 is fixed to the tip of the steel sheet pile 11. The movable claw 25a is formed with a U-shaped groove 25d in the vertical direction so that the rod 17 can be rotatably inserted therethrough.

Next, a use state of the first embodiment will be described. When a construction is performed in which the steel sheet pile 11 is continuously pressed into the ground in a wall shape, a piler is usually fixed to the tip of the steel sheet pile, and the steel sheet pile 11 is held by a chuck portion of the piler, as shown in FIG. Press in with a hydraulic cylinder while holding. When the ground is hard, the pillar auger 10 as in the present invention is attached to the tip of the steel sheet pile 11 to perform press-fitting work.

When using the pillar auger 10 of the present invention, first, the pillar auger 10 is mounted on the steel sheet pile 11 before the steel sheet pile 11 is held in the chuck portion of the piler. That is, with the rod 17 removed, the movable claw 25a of the expander 25 is retracted toward the fixed portion 25b while resisting the urging force of the spring 25c of the chuck device 12, and the gap between the movable claw 25a and the front plate 24a of the holding body 24 is reduced. The leading end of the steel sheet pile 11 is inserted between the gaps. Movable claw 25
When a is released, the movable claw 25a is returned to the original state by the spring 25c, the tip of the movable claw 25a is pressed against the inner wall of the flat plate portion 11a of the steel sheet pile 11, and the base 13 is fixed to the tip of the steel sheet pile 11. .

Then, the upper end is inserted into the U-shaped groove 25d of the movable claw 25a while the rod 17 to which the rotary blade 19 is attached is along the inner wall of the steel sheet pile 11, and the joint 1
The rod 17 is connected to the swivel 15 by fitting the lower part 16b side of the joint into the upper part 16a of 6. Rod 1
The lower end of 7 is welded to the lower part of the steel sheet pile 11 by a fixing band 21 and held rotatably.

The sheet pile 11 to which the auger motor 14 and the rod 17 are attached is held by the chuck portion of the piler, and the attaching operation is completed. The rotary blade 19 attached to the tip of the rod 17 projects from the lower end of the steel sheet pile 11. In this state, the steel sheet pile 11 is pressed into the ground by operating the hydraulic cylinder of the pillar. High-pressure water or bentonite is introduced from the water inlet 20 of the swivel 15 and injected from the nozzle portion 17a to fluidize the hard ground.

When the steel sheet pile 11 hits the hard ground, the auger motor 14 is operated to rotate the rotary blade 19 to dig the hard ground, and the hydraulic cylinder of the pillar is operated to press the steel sheet pile 11 into the hard ground. I will do it. In this way, by pressing the steel sheet pile 11 while digging with the rotary blade 19, the steel sheet pile 11 is pressed into the ground by a press-fit type pillar without drilling a hole even in a hard ground. can do.

After the steel sheet pile 11 is press-fitted to a point where it can be press-fitted by the piler, the rotary blade 1
9 is rotated to make it parallel to the flat plate portion 11a of the steel sheet pile 11, then the movable claw 25a of the chuck device 12 which has been pressed against the sheet pile 11 is separated from the sheet pile 11, and the base 17 to which the rod 17 is connected using a crane or the like. The part is pulled up from the steel sheet pile 11 and completely separated from the steel sheet pile. At that time, the rotary blade 19 at the tip of the rod 17 rises while tearing off the fixed band 21. As shown in FIG. 5, the fixing band 21 is formed with a notch 22 so as to be easily torn, and the upper part of the notch 22 is formed so as to be half-slit and then welded to be easily torn. . In addition,
Instead of making a slit, it may be cut once and this cut portion may be welded.

A cutting blade is attached to the lower end of the rod 17, and the fixed band 21 is torn when the rod 17 is pulled up. And the piler steel sheet pile 11
Is completely press-fitted to a predetermined depth, the press-fitting operation of one steel sheet pile is completed, and the process proceeds to the press-fitting operation of the next steel sheet pile. Next, a second embodiment of the present invention will be described.

FIG. 6 is an overall side view in which a part of the pillar auger of the present invention is omitted, FIG. 7 is a rear view, and FIG. 8 is an enlarged top view. In the drawings, the steel sheet pile 11, the auger motor 14, the swivel 15, the rotary blade 19, and the like are the same as those in the above-described embodiment, and the same reference numerals are assigned and detailed description is omitted. The pillar auger 30 according to the second embodiment is significantly different from the above-described embodiment in that the auger motor 14, the swivel 15, and the rod 31 can move up and down. Hereinafter, description will be made based on the drawings.

Piler auger 30 of this embodiment
Are separate from the chuck device 32 and the base 33 and are joined by a flange 34. The base 33 includes a U-shaped portion 33a having a U-shape in a lower side in a plan view, and a flat plate portion 33b extending from a central portion to an upper portion,
Two guide holes 37 are formed in the flat plate portion 33b in parallel in the vertical direction. A movable plate 38 is provided on the front side of the flat plate portion 33b.
Is provided so as to be able to move up and down. That is, two holding rollers 39 are supported on the left and right upper and lower ends of the movable plate 38, respectively, to sandwich the flat plate portion 33b from the front side and the back side. Move up and down. Reference numeral 41 denotes a rib provided on the back surface of the movable plate 38, which protrudes from the guide hole 37 to the back side. The tip of a rod 40 a of the lifting cylinder 40 is supported between the ribs 41. The lower end of the cylinder 40 is pivotally supported at the lower end of the rear surface of the U-shaped portion 33a.

Both sides of the movable plate 38 are formed wider than the flat plate portion 33b, and anti-sway rollers 42 for anti-sway are rotatably supported at four positions in the wide portion, and the roller 42 is fixed to the flat plate portion 3b.
3b is pressed against the side surface. The auger motor 14, the swivel 15, and the rod 31 are smoothly moved up and down by the nipping roller 39 and the steadying roller 42. The chuck device 32 includes a U-shaped holding member 43 similar to the above-described embodiment.
And the hydraulic expander 4 is provided in the holding body 43.
4 are arranged in upper and lower two stages. Reference numeral 45 denotes a movable claw, which is pressed against an inner wall of the steel sheet pile 11 by a chuck hydraulic cylinder 46 to fix the base 33 to an upper portion of the steel sheet pile 11.
The movable claw 45 is also formed with a U-shaped groove so that the rod 31 is rotatably held. 46a is a hydraulic pipe of the chuck device 32.

The joint 47 for connecting the swivel 15 and the rod 31 has a structure as shown in FIG. This joint 47 comprises an upper part 47a and a lower part 47b,
In a state where the upper part 47a and the lower part 47b are fitted, a water guide hole 47c communicating from the upper end to the lower end is provided, and the fitting hole 47d of the upper part 47a and the fitting protrusion 47e of the lower part 47b are, as shown in FIG. It has a hexagonal shape, and is configured so that the torque of the swivel 15 can be reliably transmitted to the rod 31 without the lower portion 47b idling even when the upper portion 47a rotates.
The inner wall of the fitting hole 47d of the upper part 47a of the joint 47 and the fitting projection 47e of the lower part 47b have a notch having a semi-cylindrical cross section, and both notches overlap to form a cylindrical pin hole 48. A pin 47f for retaining is fitted in the pin hole 48 so that the upper part 47a and the lower part 47b do not come off. 49 is a packing for preventing leakage of high-pressure water.

The same rotary blade 19 as in the above embodiment is also attached to the lower end of the rod 31. In this embodiment, a single blade-shaped auxiliary blade 50 extending in the horizontal direction is connected between the rotary blade 19 and the rod 31 by a joint 47 having the same configuration as described above. Also in this embodiment, the lower end of the rod 31 is rotatably held by the fixed band 21. As shown in FIG. 5, the fixing band 21 is also formed with a cut 22 in advance, and is torn off when the rod 31 is pulled up by the cutting blade 51 attached to the lower end of the rod 31. Note that a valve 31b is also provided at the rear end of the nozzle portion 31a of the rod 31.

Next, the use state of the above configuration will be described. The use of the pillar auger 30 of the second embodiment is basically the same as that of the above embodiment, and the base 33 from which the rod 31 has been removed is attached to the tip end of the steel sheet pile 11 via the chuck device 32. Attach to In the above embodiment, the movable claw 25a of the expander 25 was manually opened.
In this embodiment, since the expander 44 is of a hydraulic type, the mounting of the base 33 is simple, the pressing force of the movable claw 45 is strong, and the base 33 can be securely fixed to the tip of the steel sheet pile 11.

Then, the rod 17 to which the rotary blade 19 is attached and the auxiliary blade 50 is removed is connected to the joint 47.
To the swivel 15. Auger motor 14
After the steel sheet pile 11 to which the rod 31 and the like are attached is held by the chuck portion of the piler, the lower end of the rod 31 is welded to the steel sheet pile 11 by the fixed band 21 and held rotatably.

Finally, the auxiliary blade 50 is attached to the rod 31. The rotary blade 19 attached to the tip of the rod 31 projects from the lower end of the steel sheet pile 11,
In this embodiment, it is possible to prevent the steel sheet pile 11 from protruding from the lower end. By preventing the rotary blade 19 from protruding from the lower end of the steel sheet pile 11 in this way, it is possible to prevent the rotary blade 19 from being damaged when the steel sheet pile 11 is pressed into the ground.

In this state, the steel sheet pile 11 is pressed into the ground by operating the hydraulic cylinder of the pillar. Swivel 1
High pressure water and bentonite are introduced from 5 and injected from the nozzle to fluidize hard ground. When hitting against hard ground, the auger motor 14 is driven to
And the auxiliary cutter 50 is rotated to perform pre-digging. In this embodiment, the movable plate 38 is slid downward by the lifting cylinder 40 so that the auger motor 14 and the rod 31
Can be lowered, so that the rotary cutter 19 and the auxiliary cutter 50 can perform a deep excavation with the rotary cutter 19 and the auxiliary cutter 50, and the press-fitting operation of the steel sheet pile 11 can be accelerated accordingly.

Since the diameter of the hole that can be dug only with the rotary blade 19 is small, the diameter of the hole that can be dug by the auxiliary blade 50 is increased to facilitate the press-fitting operation of the steel sheet pile 11.
When the press-fitting operation of the steel sheet pile 11 approaches the end, the auger motor 14 and the like come into contact with the chuck portion of the piler and the peripheral portion thereof, and the press-fitting operation becomes more difficult. In that case,
In this embodiment, the joint 47 is separated and a new rod is added, and the chuck device 32 and the base 33 are separated.
Remove the bolt of the flange 34 that joins the
If a new member is added to the four parts, the auger motor 14
Since the pressure rises, the press-fitting work of the steel sheet pile 11 can be continued, and there is an advantage that the steel sheet pile 11 can be deeply pressed.

In the first and second embodiments, the swivel 15 is provided between the auger motor 14 and the rod, but the present invention eliminates the swivel 15 and connects the rod directly to the auger motor 14. It may be. The inside of the rod may not be hollow, and may be solid. In the second embodiment, the rod 3
Although the auxiliary blade 50 is provided at the tip of the rotary blade 1, the auxiliary blade 50 is not necessarily required in this embodiment.
Needless to say, only 9 is acceptable.

In the second embodiment, the hydraulic cylinder is used as the lifting cylinder 40. However, the present invention is not limited to the hydraulic cylinder, and the lifting cylinder 40 may be configured to be raised and lowered by a motor.

[0038]

According to the present invention, with the above-described structure, the auger motor is driven, and the excavating blade is rotated through the rod, so that pre-digging can be performed, and the work of press-fitting the steel sheet pile can be easily performed. Moreover, since the lower end of the rod is rotatably supported on the steel sheet pile by the fixed band, the cutting tool does not escape during the pre-digging.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of an auger motor according to a first embodiment of the present invention.

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

FIG. 3 is a front view of a lower end portion of the auger motor according to the first embodiment of the present invention.

FIG. 4 is a plan view of the chuck device of the present invention as viewed from below.

FIG. 5 is a perspective view of a fixing band.

FIG. 6 is an overall side view in which a part of the second embodiment is omitted.

FIG. 7 is a rear view of the second embodiment.

FIG. 8 is a side view of a main part of the second embodiment.

FIG. 9 is a front view and a bottom view of the joint of the present invention.

FIG. 10 is a diagram illustrating a use state of the auger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Piler auger 11 Steel sheet pile 12 Chuck device 13 Base 14 Auger motor 15 Swivel 16 Joint 16a Pin 17 Rod 19 Rotary blade 30 Piler auger 31 Rod 32 Chuck device 33 Base 40 Elevating cylinder 50 Auxiliary blade

Claims (6)

[Claims] An auger motor is provided on a base, and a chuck device is provided for detachably attaching the base to an upper end portion of a steel sheet pile. A rod is directly or indirectly connected to the auger motor, and the rod is made of steel. A pillar auger extending to the lower end of a sheet pile, the lower end being rotatably supported by a steel sheet pile with a fixed band, and a cutting tool for excavation being attached to the lower end of a rod. 2. The pillar auger according to claim 1, wherein an auger motor and a swivel are connected in series and fixed to a base, and a rod is connected to the swivel. 3. The pillar auger according to claim 1, further comprising a lifting device that raises and lowers the auger motor and the rod in a vertical direction. 4. The pillar auger according to claim 1, wherein the cutting tool for excavation is a rotary cutter having a flat triangular shape, and a width of the rotary cutter is smaller than a width of the steel sheet pile. 5. The auxiliary cutting tool having a width larger than the width of the steel sheet pile is mounted on an upper part of the rotary cutting tool.
Piler auger according to. 6. The pillar auger according to claim 3, wherein the joint for connecting the rod includes an upper portion and a lower portion, and the upper and lower portions are connected by fitting a retaining pin.