JPH0640672Y2 - Excavation equipment for extracting existing piles - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention relates to an excavating device for extracting an existing pile, which is used in a work in a stage before extracting an existing pile buried in the ground.

<< Prior Art >> For example, when rebuilding a building, if there is an unnecessary residual pile that is already buried, it is necessary to remove it.

The methods of removing existing piles of this type are roughly divided into the pulling method and the crushing method. However, in the crushing method, vibration and noise around the periphery of the construction site poses a problem, and the crushing equipment becomes large in size, which limits its use in narrow places.

Therefore, ideally, it is better to pull out the existing piles and remove them.

<< Problems to be solved by the device >> However, in the drawing method, the ground friction of the existing pile is a problem, and in order to remove it, it is necessary to excavate around the pile as a pre-treatment.

For this reason, conventionally, a bucket is used to excavate around the pile, or an existing pile is surrounded by a shape such as a casing pipe, but in the case of the former, it is a narrow place. There is a problem with the workability at and the efficiency is extremely poor.

Also, in the latter case, since the entire area around the pile is excavated, the ground resistance during the excavation work becomes significantly larger as the hole diameter increases, the power consumption becomes extremely large, and the device itself Upsizing. Further, when the length of the existing pile cannot be known in advance, or when it is found during the work that the length is longer than initially expected, it is difficult to cope with this type of device.

This device is intended to solve the above problems,
The purpose of the present invention is to provide an excavating device for pulling out existing piles, which requires only a small amount of machine power, and can easily perform excavation work according to the length of existing piles even if the length is longer than initially expected. To do.

<Means for Solving Problems> In order to achieve the above objects, the present invention is directed to an elevating frame which is supported so as to be able to ascend and descend along a guide frame which is erected on the ground, and a rotating frame which is provided below the elevating frame. A boring head that is supported as possible, a plurality of rotating shafts that project to the bottom of the boring head, a boring rod that is detachably connected to the lower part of each rotating shaft, and is fixed to the periphery of the existing pile,
It consists of a rod support that axially supports the middle part of each boring rod, and by rotating the boring rod and rotating the boring head, the boring rod is revolved around the existing pile while revolving around the boring rod for excavation. It is characterized by

<< Operation >> Since the device itself does not surround the entire existing pile, the driving power required for excavation is small and the entire device can be miniaturized.

In addition, even if the existing pile is longer than initially expected, it is possible to easily cope with the length by adding intermediate rods to the boring rod one after another.

<< Embodiment >> A preferred embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a vertical sectional view showing the entire construction of the excavating device of the present invention, FIG. 2 is a vertical sectional view of a boring head, and FIG.
FIG. 4 is a perspective view showing the appearance of the boring head, FIG. 4 is an explanatory vertical sectional view showing a state in which the periphery of an existing pile is being excavated using the same device, and FIG. 5 is a perspective view showing a rod support. FIG. 7 is a sectional view showing a bearing portion of a rod support, and FIG. 7 is a partial view showing a tip bit portion of a boring rod.

In the figure, this excavating device includes a guide frame 3 provided at the tip of an arm 2 of a work vehicle 1 and a guide frame 3
An elevating frame 4 movably supported along the bobbin, a boring head 5 rotatably supported on the lower part of the elevating frame 4, and a plurality of boring rods 6 rotatably arranged on the lower part of the boring head 5. A rod supporter 8 is loosely fitted around the existing piles 7 buried in the ground and axially supports the intermediate portion of each boring rod 6.

The arm 2 is swingably supported by the work vehicle 1 via a hydraulic cylinder 21. Further, the guide frame 3 is held by the tip of the arm 2 via a pin 22 so as to be upside down, and its angular posture can be freely changed by a hydraulic cylinder 23.

The guide frame 3 includes a bracket portion 31 supported by the arm 2 and a pair of guide rods 32 provided upright on both sides of the bracket portion 31.

As shown in FIG. 3, bearings 41 through which the guide rods 32 are inserted are provided on both sides of the elevating frame 4, and the bearings 41 can be elevated along the guide rods 32.

A hydraulic cylinder 33 is arranged in the bracket portion 31, and a pair of pulleys 34, 35 are attached to the tip of a plunger 33a of the hydraulic cylinder 33. A wire 37 having one end fixed to a bracket 31 is suspended on each pulley 34, 35. The other end of the wire 37 is fixed to the upper and lower ends of a bearing 41 of the elevating frame 4 via an intermediate pulley 36.

Therefore, as the plunger 33a of the hydraulic cylinder 33 appears and disappears, the lifting frame 4 moves up and down.

The boring head 5 also serves as a gear box, and is rotatably supported by a ball bearing 44 provided on the lower peripheral edge of the elevating frame 4.

A gear 44a is formed on the outer periphery of the ball bearing 44 and meshes with a pinion 45a of a revolving motor 45 fixed to one side of the upper portion of the elevating frame 4.

A motor 46 for rotation is fixed to the upper part of the elevating frame 4. The pinion 46 a of the motor 46 includes a lifting frame 4, a boring head 5 in the lifting frame 4.
It is meshed with a gear 47a of a hollow shaft 47 which is rotatably supported by vertically penetrating the center thereof.

Inside the boring head 5, three output gears 53 that mesh with the input gear 52 provided on the hollow shaft 47 are arranged, and an output shaft 54 provided at the center of each output gear 53 rotatably projects to the lower part of the boring head 5. ing.

Each output shaft 54 is hollow inside and is rotatably connected to the lower protruding end of the hollow shaft 47 via water swivels 55 and 56, respectively.

A water swivel 57 is also provided on the upper end of the hollow shaft 47, and the water swivel 57 is circulated in a supply pipe 58 for the drilling fluid.

The boring rod 6 is mounted on each output shaft 54 in a screwed manner.

The boring rod 6 is also hollow, and a plurality of convex shapes 61 for excavation are projectingly provided on the outer periphery of the lower portion thereof as shown in FIG. 7, and a spreading bit 62 is formed at the tip.

The rod supporter 8 prevents the centering and twisting of the boring rod 6 or the boring rod 6 from coming into contact with the existing pile 7, and keeps the boring rod 6 in an appropriate posture when rotating itself and revolving. It is formed in a ring band shape so as to surround the outer periphery of the bearing, and a bearing portion 81 for supporting the intermediate portion of the boring rod 6 is formed inside.

As shown in FIG. 6, the bearing 81 is attached to the inner peripheral portion of the rod supporter 8 at a 120 ° interval so as to be detachably fixed to the bracket 82, which is substantially semicircular, and is held by the inner peripheral portion of the bracket 82. It consists of a bearing metal 83 through which the boring rod 6 is rotatably inserted. Then, the stopper portion 83a is fixed to the outer periphery of the boring rod 6 above and below the bearing metal 83 to prevent the rod supporter 8 from falling off the rod 6.

Although one rod supporter 8 bears the boring rod 6 in the figure, if the rod supporters 8 are provided in multiple stages, the boring rod 6 can be supported more reliably.

Next, a working method using the excavator having the above configuration will be described.

First, as shown in FIG. 4, the outer periphery of the upper portion of the existing pile 7 is excavated to some extent, and with the upper portion exposed, the work vehicle 1 is positioned near the excavation site as shown in FIG.
21 and 23 are operated, and the guide frame 3 is erected vertically. Next, the rod supporter 8 which rotatably supports the boring rod 6 is made rotatable about the existing pile 7. Then, the upper end of the boring rod 6 is screwed and fixed to the output shaft 54.

When the rotation motor 46 is driven to rotate after completion of the above-described preparation operation, each boring rod 6 rotates, and the tip bit 62 thereof excavates the peripheral ground of the existing pile 7. Then, by rotating the revolution motor 45, the boring rod 6 revolves around the periphery of the existing pile 7 while rotating on its own axis. Then, if the elevating frame 4 is lowered along the guide frame 3, as shown in FIG. 4, the entire surrounding ground is excavated concentrically.

During the excavation work, if the excavation fluid is pumped into the hollow shaft 47 through the supply pipe 58, the excavation fluid is discharged from the tip bit 62 of the boring rod 6, and the excavation is performed in this state, so there is little resistance and the later extraction. Work becomes easy. If the existing pile 7 is long and it is still necessary to excavate even when the elevating frame 4 is lowered to the lowest position, the boring rod 6 is removed from the output shaft 54 and an intermediate rod (not shown) is attached. The same excavation work as described above may be performed again by replenishing.

<Effects of the Invention> As described in detail in the above embodiments, according to the present invention, since the device itself does not surround the entire existing pile, the driving power required for excavation can be small and the entire device can be miniaturized. it can.

Moreover, even if the existing piles are longer than initially expected, it is possible to easily cope with the length by connecting the boring rods one after another.

Therefore, in the excavator of the present invention, the excavation work can be performed in accordance with the length of the existing pile even if the power of the excavator is small and the length of the existing pile is longer than initially expected.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the entire construction of the excavating device of the present invention, FIG. 2 is a vertical sectional view of a boring head, and FIG.
FIG. 4 is a perspective view showing the appearance of the boring head, FIG. 4 is an explanatory vertical sectional view showing a state in which the periphery of an existing pile is being excavated using the same device, and FIG. 5 is a perspective view showing a rod support. FIG. 7 is a sectional view of a bearing portion of a rod support, and FIG. 7 is a partial view showing a tip bit portion of a boring rod. 3 …… Guide frame 4 …… Lift frame 5 …… Boring head 6 …… Boring rod 7 …… Existing pile 8 …… Rod supporter 45,46 …… Motor 47 …… Hollow shaft 54 …… Output shaft 55,56… … Water swivel

Claims (2)

[Scope of utility model registration request] 1. An elevating frame that is supported so as to be able to ascend and descend along a guide frame that is erected on the ground, a boring head that is rotatably supported at the bottom of the elevating frame, and a plurality of protrusions that project to the bottom of the boring head. Rotating shaft, and a boring rod detachably connected to the bottom of each rotating shaft,
It consists of a rod supporter that is fixed to the periphery of the existing pile and pivotally supports the middle portion of each of the boring rods, while rotating each boring rod and the rotation of the boring head to rotate each boring rod around the periphery of the existing pile. An excavation device for extracting existing piles characterized by being revolved for excavation. 2. Each of the rotating shafts and the boring rod is formed of a hollow body, and a hollow pipe for supplying a drilling fluid is arranged so as to pass through the lifting frame and the boring head, and the pipe is provided through a water swivel. The existing pile extraction according to claim 1 characterized in that it is rotatably connected to each rotary shaft, and the drilling fluid is discharged from the tip of the boring head through the pipe. Drilling equipment.