JP2001262566A - Device for pile installation by inner excavation, leader, pile cencer dislocation preventive device and pile installation by inner excavation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide device for pile installation by inner excavation capable of using a base machine composed of a small crane and a pile installation by inner excavation using this device. SOLUTION: In this device for pile installation by inner excavation one end part is connected to an earth auger driving device 3 on the inside of the lower end side of a vertically erected leader 2. A squeezing sheave 23 is arranged for hooking a midway part of the squeezing wire 83 having the other end locked on a hook 7 lifting by a wire 81 wound or rewound by a winch 52 for the hook mounted on the base machine 5 to thereby lift the hook 7 by winding up the wire 81 by the winch 52 for the hook. Thus the earth auger driving device 3 can be forcedly lowered by squeezing the squeezing wire 83 locked on the hook 7 to thereby impart press-in force to a hollow pile 9. As a result, even when using the base machine 5 composed of the small crane, the hollow pile 9 can be built up in the ground by this construction method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Nakahori device, a leader, a device for preventing a center shift of a pile and a Nakahori method.

[0002]

2. Description of the Related Art The Nakahori method is a method of inserting a spiral auger into a hollow pile in advance and excavating with the spiral auger and simultaneously inserting the hollow pile into the ground to build it. The Nakahori device is required to be able to apply a certain force (press-in) to the hollow pile at the same time as the excavation by the spiral auger to press it into the ground. Therefore, conventionally, a large-sized mechanical device called a three-point pile driver has been used as a base machine that supports a leader and controls the driving and elevating of an earth auger driving device that is arranged to be able to move up and down along the leader. ing. According to the three-point pile driver as the base machine, it is possible to apply a press-fit to the hollow pile as much as possible to be pressed into the ground, and press-fit the hollow pile simultaneously with the excavation by the spiral auger. Can be built inside.

[0003]

However, since the above-mentioned three-point pile driver as a base machine is a large-sized machine, it can be constructed only at a site where it has a large work area and can secure a wide carry-in path. There was a problem. Further, in order to prevent accidents such as a fall during construction, in a site where the ground is unstable, maintenance work on the ground is required in advance to install the mechanical device, and there has been a problem that construction costs are high. Furthermore, the transport is disassembled and transported to the site, but the transport requires a plurality of trailers, so that there is a problem that the transport cost is high.

On the other hand, in order to solve the above-mentioned problems, instead of a three-point pile driver as a base machine, general roads such as a wheel crane and a rusty crane (rafter) used in the outer moat method (for example, 4 m) are used. It is also conceivable to use a small crane that can travel on its own on a road with a wide width.
However, in the conventional excavation method using these small cranes, it is normal to lower the earth auger driving device by its own weight and perform excavation by a spiral auger connected to the earth auger driving device. However, it was not suitable for the Nakahori method because the hollow pile could not be pressed enough to be pressed into the ground.

The present invention has been made in view of the above points, and even when a small crane capable of traveling on a general road by itself is used as a base machine, a pressure sufficient to be able to be pressed into the hollow pile into the ground. Nakahori equipment, leader, pile center misalignment prevention equipment that can provide input, thereby enabling construction by the Nakahori method even in a narrow work area and a narrow carry-in path, and reducing the construction cost and transport cost And to provide Nakahori method.

[0006]

According to a first aspect of the present invention, there is provided a middle moat apparatus according to the first aspect of the present invention, which includes a leader vertically erected by a base machine and a vertically movable member along the leader. And a spiral auger connected to the earth auger driving device, wherein a press input for press-fitting the hollow pile into which the spiral auger is inserted is applied to the earth auger driving device. It is characterized by having means for performing.

According to a second aspect of the present invention, there is provided the middle moat apparatus according to the first aspect, wherein the means comprises a narrowing sheave disposed inside the lower end of the reader, and the narrowing sheave. One end is connected to the earth auger driving device via a hook winch mounted on the base machine. And a narrowing wire.

According to a third aspect of the present invention, there is provided the middle moat apparatus according to the first or second aspect, wherein the base machine is a small crane which can travel on a general road by itself.

According to a fourth aspect of the present invention, there is provided the middle moat apparatus according to the second or third aspect, wherein a wire wound or unwound by the hook winch is provided near an upper end of the leader. The present invention is characterized in that it is bridged between a hook top sheave to be provided and a hook hanging sheave that is arranged below the hook top sheave and connected to the hook.

According to a fifth aspect of the present invention, there is provided the middle moat apparatus according to any one of the first to fourth aspects, wherein the lower end portion of the leader can be fixed and the excavator is capable of fixing the lower end during excavation. The present invention is characterized by including a pile center misalignment prevention device capable of maintaining a constant distance between a leader and the spiral auger.

According to a sixth aspect of the present invention, there is provided the middle moat apparatus according to the fifth aspect, wherein the pile center misalignment preventing apparatus comprises: a leader fixing portion into which a lower end of the leader is inserted; At a predetermined distance from the center point of the fixed portion, and on an extension thereof, the center point is located, and a hollow pile insertion portion having a diameter larger than the outer diameter of the hollow pile built into the ground is provided. It is characterized by comprising.

According to a seventh aspect of the present invention, there is provided a middle boring device according to the sixth aspect, wherein the upper part of the hollow pile insertion portion of the pile center misalignment preventing device is larger than the inner diameter of the hollow pile insertion portion. A replaceable diameter adjusting member having a small inner diameter is provided.

The reader of the present invention according to claim 8 is vertically erected by a base machine and has a lower end inside.
One end is connected to the earth auger driving device, and the other end is in the middle of a narrowing wire locked by a hook that is raised and lowered by a wire that is wound up or down by a hook winch mounted on the base machine. A narrowing sheave on which the portion is hung is provided.

According to a ninth aspect of the present invention, a pile center misalignment prevention device according to the present invention is capable of fixing a lower end portion of a leader vertically erected by a base machine and maintaining a constant distance between the leader and a spiral auger. It can be held.

According to a tenth aspect of the present invention, there is provided the pile center misalignment prevention device according to the ninth aspect, wherein the leader fixing portion into which the lower end of the leader is inserted, and the leader fixing portion are provided. At a predetermined distance from the center point and on an extension of the center point, the center point is located, and a hollow pile insertion portion having a diameter larger than the outer diameter of the hollow pile built into the ground is provided. It is characterized by having.

According to an eleventh aspect of the present invention, there is provided the pile center misalignment preventing device according to the tenth aspect, wherein the pile inner portion has an upper portion which is larger than the inner diameter of the hollow pile portion. A replaceable diameter adjusting member having a small inner diameter is provided.

In the method according to the present invention, a base machine is preferably used in which a spiral auger is inserted into a hollow pile and the hollow pile is buried in the ground while excavating the ground with the spiral auger. One end is connected to a grounding auger drive device that is disposed vertically movable along the leader, to a narrowing sheave provided inside the lower end side of the leader that is erected vertically, and is connected to the base machine. A hook which is lifted or lowered by a wire wound or unwound by a mounted hook winch is hung on the middle of the narrowing wire having the other end locked, and excavation by the spiral auger is performed by the hook winch. By winding up the wire to raise the hook and narrowing down the narrowing wire locked to the hook, By lowering the Suoga drive downwardly, and performing press-fitting of the hollow pile.

According to a thirteenth aspect of the present invention, there is provided the middle moat construction method according to the twelfth aspect, wherein the base machine is a small crane capable of traveling on a general road by itself.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a Nakahori apparatus according to one embodiment of the present invention. As shown in this figure, the Nakabori device 1 includes a reader 2, an earth auger driving device 3, a spiral auger 4, and a base machine 5.

The reader 2 has its upper end connected to the tip of the boom 51 of the base machine 5 and is vertically set up. The reader 2 is a column having a substantially rectangular cross section surrounded on all sides by a long steel plate, and a guide rail 21 to which the earth auger driving device 3 is vertically movable is provided along a side wall thereof. Further, inside the lower end side of the reader 2, a narrowing sheave 23 supported by a shaft 22, both ends of which are supported by walls located at the front and back of the reader 2, respectively.
Is provided. The narrowing sheave 23 is a large pulley having substantially the same diameter as the width of the leader 2, and is freely rotatable about the shaft 22.

In the vicinity of the upper end of the reader 2, there is provided a sheave box 6 in which a hook top sheave 61 and an auger top sheave 63 are disposed. As shown in FIG. 2, below the hook top sheave 61, a hook suspension sheave 6 to which the hook 7 is connected is provided.
2, a wire 81 wound or unwound by a hook winch 52 mounted on the base machine 5 is stretched between the hook top sheave 61 and the hook suspension sheave 62. I have. An auger suspension sheave 64 to which the earth auger driving device 3 is connected is disposed below the auger top sheave 63, and a base is disposed between the auger top sheave 63 and the auger suspension sheave 64. A wire 82 wound or unwound by an auger winch 53 mounted on the machine 5 is stretched. In FIG. 2, reference numeral 64 denotes a guide sheave provided near the tip of the boom 51 of the base machine 5.

The earth auger driving device 3 is connected to the guide rail 21 of the reader 2, and its upper part is raised and lowered by a wire 82 wound or unwound by an auger winch 53 mounted on the base machine 5. It is connected to the auger suspension sheave 64 and is arranged so as to be able to move up and down along the reader 2. Further, one end of the narrowing wire 83 is connected to a lower portion of the earth auger driving device 3. As shown in FIGS. 1 and 2, this narrowing wire 83 has one end connected to the lower part of the earth auger driving device 3, the other end locked to the hook 7, and the middle thereof. The portion is hung on a sheave 23 for narrowing which is rotatably supported by the shaft 22 inside the lower end side of the reader 2. The earth auger driving device 3 including the narrowing wire 83 and the narrowing sheave 23
On the other hand, a narrowing-down means as a means for giving a press-fit for press-fitting the hollow pile 9 into which the spiral auger 4 is inserted is configured.

The spiral auger 4 has a blade at its tip for excavating underground, and has a spirally rotating blade around a shaft. The spiral auger 4 is inserted in advance into a hollow pile 9 to be buried underground, and the rear end thereof is connected to the earth auger driving device 3. When attaching the spiral auger 4 to the earth auger driving device 3, a collar 10 is interposed between the earth auger driving device 3 and the hollow pile 9 into which the spiral auger 4 is inserted (see FIG. 1). .

As the base machine 5, for example, it is preferable to use a small crane such as a wheel crane or a lasty crane (rafter) capable of traveling on a road having a width of 4 m. According to the base machine 5, since it is possible to travel on a general road by itself, it is possible to greatly reduce the transportation cost as compared with the case of the conventional three-point pile driver, and it is necessary to secure a wide loading path. Absent. In addition, even at a site where the ground is unstable, there is no need to perform large-scale ground maintenance work like a conventional three-point pile driver for installation,
Simple construction is required, construction costs can be greatly reduced, and the construction period can be significantly reduced. Further, since the installation space of the entire Nakahori apparatus 1 including the base machine 5 can be small, it is suitable for a site where the work area is small.

Next, the operation of the above-described Nakahori apparatus 1 will be described with reference to FIGS. First, Nakabori device 1
The pile core of the hollow pile 9 is set at a predetermined burying position so that the hollow pile 9 into which the spiral auger 4 is inserted is buried at a predetermined position, and is installed in a state shown in FIG. When installing the Nakabori device 1, the leader 2 was started up,
The operations of attaching the earth auger driving device 3 to the reader 2, lifting the hollow pile 9 into which the spiral auger 4 is inserted, and connecting the spiral auger 4 to the earth auger driving device 3 are all performed by one base machine. 5 can be performed. Therefore, another crane (phase number crane) for lifting the hollow pile into which the spiral auger is inserted, which is used in the conventional Nakahori apparatus, is not required.

Further, according to the Nakabori apparatus 1, the boom 51 of the base machine 5 can be extended, and the base machine 5 and the reader 2 can be installed with a certain distance therebetween. That is, conventionally, in order to prevent a three-point pile driver as a base machine from being lifted by a resistance (reaction force) generated during excavation, it is necessary to install the base machine and the reader at a position close to each other. Was restricted. However, in the Nakabori device 1, as described later, by narrowing down the narrowing wire 83, the earth auger driving device 3 is forcibly lowered and excavated in the ground, and the hollow pile 9 is press-fitted. Therefore, the reaction force reaches the reader 2 and hardly reaches the base machine 5. For this reason, even if the base machine 5 and the reader 2 are installed with a certain distance between them, the base machine 5 hardly rises, thereby making it possible to increase the working radius as compared with the related art. In addition, for example, when the hollow pile 9 having a relatively large diameter exceeding 500 mm is buried in the ground, or when the ground is strong, the reaction force is large. It is preferable to provide a means for preventing the leader 2 from floating.

As the lifting prevention means, for example, the pile center misalignment prevention device 100 shown in FIGS. 3 and 4 can be used. The pile center misalignment prevention device 100 includes a reader fixing portion 120 and a hollow pile insertion portion 130 on a substrate 110 laid on the ground. The reader fixing portion 120 is formed in a box shape having an open upper surface so that the lower end portion of the reader 2 having a substantially square cross section can be fitted therein. Each of the fixing pins 120a and 120b is formed with a fixing pin insertion hole 120c through which a fixing pin 121 (see FIG. 4) for fixing the lower end of the reader 2 is inserted in the thickness direction (FIG. b)). However, the shape of the reader fixing portion 120 is determined according to the shape of the lower end portion of the reader 2, and is not limited to the above-described box shape. As shown in FIG. 3A, the hollow pile insertion portion 130 is located at a predetermined distance R from an intersection (center point) P of a diagonal line of the leader fixing portion 120 and on an extension thereof.
It is formed in a substantially cylindrical shape having a center point Q and a diameter slightly larger than the outer diameter of the hollow pile 9 built underground. The bottom of the hollow pile insertion portion 130 and the portion corresponding to the bottom of the substrate 110 are both hollow hollow 9
Are formed so that they can be inserted.

The pile center misalignment prevention device 100 includes a hollow pile 9
Is installed on the ground so that the opening of the hollow pile insertion portion 130 is aligned with the position where is embedded. As shown in FIG. 4, the lower end of the reader 2 is fitted into the reader fixing part 120. The lower end of the reader 2 has a fixed pin 121
Is formed, and when the lower end of the reader 2 is inserted into the reader fixing part 120, the fixing pin insertion part 1 formed in the reader fixing part 120 is formed.
The fixing pin 121 is inserted into the hole 20c and the hole formed at the lower end of the reader 2. And, as described above, the fixing pin 12
By connecting the leader 2 and the pile center misalignment prevention device 100, the lower end of the leader 2 is fixed, and the weight of the pile center misalignment prevention device 100 can prevent the leader 2 from floating. When the reaction force at the time of excavation is larger than a predetermined value, it can be dealt with by adding a weight to the pile center misalignment prevention device 100.

On the other hand, as shown in FIG. 4, the hollow pile 9 into which the spiral auger 4 is inserted is inserted into the hollow pile insertion portion 130. Thereby, the hollow pile insertion portion 130 exerts a guide function when the hollow pile 9 is vertically pressed into the ground, and the lower end portion has the leader fixing portion 1 during excavation.
20 and the hollow pile insertion portion 13
The space S between the spiral auger 4 and the axis of the spiral auger 4 inserted into the hollow pile 9 inserted into the hollow pile 9 can be kept constant. Since the hollow pile 9 is inserted in a state where there is almost no gap between the hollow pile 9 and the inner peripheral surface of the portion 130, the center of the hollow pile 9 can be prevented from shifting. As a result, the hollow pile 9 can be erected vertically in the ground without checking the displacement of the pile core many times during the excavation as in the related art.

As shown in FIG. 5, the pile center misalignment prevention device 100 further includes a replaceable diameter adjusting member 140 for adjusting the diameter of the opening of the hollow pile insertion portion 130.
Is preferably provided. This caliber adjusting member 140 is
It is formed in a substantially convex cross section including a cylindrical portion 141 having an inner diameter smaller than the inner diameter of the hollow pile insertion portion 130 and a disk-shaped mounting portion 142 provided at a lower end of the cylindrical portion 141. The mounting portion 142 is provided with the hollow pile insertion portion 130.
It is attached to the upper part of the hollow pile insertion portion 130 by being fixed to the disk-shaped attachment portion 131 provided at the upper end of the stake using a stopper 150 such as a bolt. As the diameter adjusting member 140, various members having different diameters of the inner diameter of the cylindrical portion 141 are prepared in advance, and are appropriately replaced and used according to the outer diameter of the hollow pile to be built in the ground. This makes it possible to cope with various types of hollow piles having different outer diameters.

In the Nakahori apparatus 1 installed as described above, the operating part (not shown) provided on the base machine 5 is operated to drive the earth auger driving device 3 and the spiral auger 4 connected thereto. The earth is excavated by rotating. Simultaneously with the excavation, the hook winch 52 mounted on the base machine 5 is operated, and the wire 81 wound around the drum of the hook winch 52 is wound up. This wire 81 is, as shown in FIG.
Since it is hung between the hook top sheave 61 and the hook suspension sheave 62, it is wound up by the hook winch 52, and thereby the hook suspension sheave 6 is wound.
2 and the hook 7 connected thereto is pulled upward.

One end of the hook 7 is connected to the lower part of the earth auger driving device 3, and an intermediate part thereof is a narrowing wire 83 hung on a narrowing sheave 23 disposed inside the lower end of the reader 2. Since the other end of the wire is locked, the hook 7 is pulled up, whereby the wire 83 is narrowed, and the earth auger driving device 3 is forcibly lowered. As a result, a pressure input is given to the hollow pile 9 disposed below the earth auger driving device 3 via the collar 10, and the hollow pile 9 is
Is being pressed into the ground.

As described above, according to the Nakabori device 1 according to the present embodiment, since the narrowing sheave 23 on which the narrowing wire 83 is hung is disposed inside the lower end side of the reader 2, the hook winch 52 is provided. The hook 7 is raised by winding up the wire 81 by the
The earth auger driving device 3 can be forcibly lowered by narrowing down the narrowing wire 83 locked to the hollow pile 9, whereby a press input can be applied to the hollow pile 9. As a result, even when the base machine 5 composed of a small crane is used, the hollow pile 9 can be built underground by the Nakahori method.

When a large pressure input is required, such as when a large-diameter hollow pile is buried in the ground, the number of pulleys constituting the hook top sheave 61 and the hook suspension sheave 62 is reduced. This can be dealt with by increasing the pulling force of the hook 7 by appropriately increasing the number of the pulleys and wrapping the wires 81 over the respective pulleys. The excavation by the spiral auger 4 removes the soil from the hollow pile 9.
Inside the spiral auger 4, it rises so as to rise along the spirally rotating blades, and is discharged from the upper end opening of the hollow pile 9, but is prevented from scattering at the time of discharging the discharged soil. For this purpose, it is preferable to provide a discharge hopper capable of storing the discharged soil at the discharge site.

[0035]

As described above, according to the Nakahori apparatus of the present invention and the Nakahori method using the apparatus, even when a small crane capable of traveling on a general road by itself is used as a base machine, a hollow pile can be used. As a result, it is possible to apply a press input that can be pressed into the ground, and it is possible to perform construction by the Nakahori method even in a narrow work area and a narrow carry-in path, and to reduce the construction cost and transport cost. it can. Further, according to the reader of the present invention, since the narrowing sheave is provided inside the lower end side, the Nakabori method can be easily performed by arranging the wire on the narrowing sheave. Moreover, according to the pile center misalignment prevention device of the present invention, it is possible to prevent the rise of the leader during excavation, and to keep the gap between the leader and the spiral auger constant, thereby preventing the pile center misalignment of the hollow pile. can do.

[Brief description of the drawings]

FIG. 1 is a diagram showing a Nakahori apparatus according to one embodiment of the present invention.

FIG. 2 is a diagram for explaining an operation of the Nakabori device according to the embodiment;

FIG. 3 is a diagram showing a pile center misalignment prevention device,
2A is a plan view, and FIG. 2B is a cross-sectional view along the line AA in FIG.

FIG. 4 is a diagram illustrating a use state of the pile center misalignment prevention device.

FIG. 5 is a cross-sectional view showing a state in which a diameter adjusting member is attached to the pile center misalignment prevention device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nakahori apparatus 2 Leader 21 Guide rail 22 Shaft 23 Narrowing sheave 3 Earth auger drive 4 Spiral auger 5 Base machine 51 Boom 52 Hook winch 53 Auger winch 6 Sheave box 61 Hook top sheave 62 Hook hanging sheave 63 Auger Top sheave 64 Auger hanging sheave 7 Hook 81, 82 Wire 83 Refinement wire 9 Hollow pile 100 Pile misalignment prevention device 110 Substrate 120 Leader fixing part 130 Hollow pile insertion part 140 Diameter adjusting member

Claims (13)

[Claims] 1. A moat having a reader vertically set up by a base machine, an earth auger driving device arranged to be able to move up and down along the reader, and a spiral auger connected to the earth auger driving device. The apparatus according to claim 1, further comprising means for applying a press-fit to the earth auger driving device for press-fitting the hollow pile into which the spiral auger is inserted. 2. A center moat apparatus according to claim 1, wherein said means is provided to a narrowing sheave disposed inside a lower end side of said reader, and to said earth auger driving device via said narrowing sheave. A squeezing means having one end connected thereto and a squeezing wire having the other end locked to a hook which moves up and down by a wire wound or unwound by a hook winch mounted on the base machine. Nakahori equipment characterized by the above-mentioned. 3. The middle moat apparatus according to claim 1, wherein the base machine is a small crane capable of traveling on a general road by itself. 4. The center moat apparatus according to claim 2, wherein a wire wound or unwound by the hook winch is provided with a hook top sheave disposed near an upper end of the reader. A Nakabori device, which is disposed below the hook top sheave and is bridged between the hook sheave connected to the hook. 5. The middle moat apparatus according to claim 1, wherein a lower end of the leader can be fixed, and a gap between the leader and the spiral auger is fixed during excavation. A Nakabori device comprising a pile center misalignment prevention device that can be held in a pile. 6. The center moat apparatus according to claim 5, wherein the pile center misalignment prevention device is provided with a leader fixing portion into which a lower end portion of the leader is inserted, and a predetermined distance from a center point of the leader fixing portion. And a hollow pile insertion portion having a center point located on an extension of the hollow pile and having a diameter larger than the outer diameter of the hollow pile to be built in the ground. apparatus. 7. A replaceable diameter adjusting member according to claim 6, wherein an inner diameter of said hollow pile insertion portion is smaller than an inner diameter of said hollow pile insertion portion above said hollow pile insertion portion of said pile misalignment prevention device. A Nakabori device, characterized by having a device. 8. A vertical upright by a base machine, and one end is connected to an earth auger driving device inside the lower end side, and the other end is provided by a hook winch mounted on the base machine. A reader provided with a draw-down sheave on which an intermediate portion of a draw-down wire locked by a hook which moves up and down by a wire to be wound or unwound is provided. 9. A pile core misalignment prevention method, wherein a lower end of a leader vertically erected by a base machine can be fixed and a distance between the leader and a spiral auger can be kept constant. apparatus. 10. The pile center misalignment prevention device according to claim 9, wherein a leader fixing portion into which the lower end of the leader is inserted, and a predetermined distance from a center point of the leader fixing portion, and an extension thereof. A pile center misalignment prevention device, comprising: a center point located on a line; and a hollow pile insertion portion having a diameter larger than an outer diameter of a hollow pile built into the ground. 11. The pile center misalignment prevention device according to claim 10, wherein a replaceable diameter adjusting member having an inner diameter smaller than the inner diameter of the hollow pile insertion portion is provided above the hollow pile insertion portion. A device for preventing misalignment of a pile. 12. A middle moat method in which a spiral auger is inserted into a hollow pile and the hollow pile is buried in the ground while excavating the ground with the spiral auger, wherein a lower end of a leader vertically erected by a base machine is provided. One end is connected to an earth auger driving device that is arranged to be able to move up and down along the leader, to a sheave for narrowing provided inside the side, and is wound or wound by a winch for a hook mounted on the base machine. The hook which is lifted by the wire to be rewound is hung on the middle part of the narrowing wire having the other end locked, and simultaneously with the excavation by the spiral auger, the wire is wound up by the hook winch to raise the hook. Squeezing the squeezing wire locked by the hook, thereby lowering the earth auger driving device downward. By causing, Nakahori method which is characterized in that the press-fitting of the hollow pile. 13. The method according to claim 12, wherein:
Nakabori method, wherein the base machine is a small crane capable of traveling on a general road by itself.