JPH10227191A - Inner excavator for excavating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable sure and efficient excavation and discharge of the ground in a casing tube by providing an arm openably and closeably attaching an excavation bit downward of a detachable fixing means on the inside of the casing tube. SOLUTION: An inner excavator 100 is lowered into a easing tube 011 fitted in the outer periphery of concrete of a foundation pile 40. When the inner excavator 100 is supported by concrete 41 of the foundation pile 40 through a cylinder support 13, a wire 010 is loosed, weight 3 is lowered, a gripper 6 is pushed out by an upper ring 7 to the outside, and pushed to the inner wall of the casing tube 011 to fix the inner excavator 100. In this state, when the casing tube 011 is rotated, an excavation arm 16 is integrally rotated, a cylinder 14 is extended by supply of pressure oil, the excavation arm 16 is pushed out by a link 18 outward and a cutting bit 19 cuts the foundation pile 40. Since the cutting bit 19 is attached to the excavation arm 16 and excavation is performed by utilizing rotation of the casing tube 011, it can surely respond to the excavation of reinforced concrete and bedrock.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pit excavator which is applied to a cast-in-place pile for constructing a foundation pile, and excavates by rotating a casing tube and pushing it into the ground. The present invention relates to a middle digging excavator used in the field.

[0002]

2. Description of the Related Art First, referring to FIGS. 9 to 11, a general all-casing type boring machine (pit excavator) will be described.
Will be described. Here, FIG. 9 is a schematic side view showing a schematic configuration of the boring machine, FIG. 10 is a longitudinal sectional view showing a casing tube in the boring machine, and FIG. 11 is for explaining an excavating operation in the casing tube. FIG.

As shown in FIG. 9, a boring machine 00
In 1, a main body 003 is mounted on an upper part of a traveling device 002. On the main body 003, a cylinder 004
And a boom 006 driven up and down by
A winch 007 for winding / unwinding one end of the wire 10 is provided. The wire 10 is guided by a pulley 005 attached to the tip of the boom 006, and the other end is connected to a grab bucket 009.
Is supported in a suspended state. And grab bucket 0
A glove 008 is attached to the front end (lower end) of 09 to be openable and closable.

A pushing device 012 for pushing the casing tube 011 into the ground (earth and sand) 018 (excavation portion) is provided at the front of the main body 003. The pushing device 012 is also provided with a rotating means (not shown) for rotating the casing tube 011. The pushing device 012 pushes the casing tube 011 into the excavation section while rotating the casing tube 011 by using the rotating means. Grab bucket 009 (Grab 00
The excavation work is performed using 8).

On the other hand, the casing tube 011 is
As shown at 0, the first tube 014 has a fixed bit 013 mounted on the lower end circumference, and an upper casing 017 connected to the upper end side of the first tube 014. First tube 01
4 and the upper casing 017 are the first tube 0
14 and a female joint 016 provided at a lower end of the upper casing 017.

When the casing tube 011 is pushed to a predetermined depth by the pushing device 012 and the length of the casing tube 011 is insufficient, another upper casing 017 is connected to the upper end of the upper casing 017. Again, as before,
Lower upper casing 017 and upper upper casing 0
Reference numeral 17 denotes a male joint 015 provided at the upper end of the lower upper casing 017 and an upper upper casing 017
Are connected via a female joint 016 provided at the lower end of the head.

In the boring machine 001 of the all-casing type constructed as described above, as shown in FIG.
While rotating it around its axis to penetrate the ground (ground 018) by applying a pushing force, and
9 and the soil 018a in the casing tube 011
Is excavated with a grab bucket 009 and discharged.

That is, the winch 007 is set in a free state, the wire 010 is fed out of the winch 007, and the grab bucket 009 hung by the wire 010 is freely dropped into the casing tube 011. After the sediment 018a in the casing tube 011 is grasped by the grab 008 at the lower end of the grab bucket 009, the wire 010 is wound up by the winch 007, and the grab bucket 009 is pulled up from the casing tube 011 to take out the sediment 018a. By repeatedly performing such operations, excavation in the casing tube 011 is performed.

When a vertical hole having a specified depth is formed in the casing tube 011 by the above excavation,
A reinforcing rod is put in the casing tube 011, and while the ready-mixed concrete is poured, a pulling force is applied to the casing tube 011 to gradually pull out the casing tube 011 from the ground 018 to complete the construction of the foundation pile. .

[0010]

However, in the above-described conventional excavation method, since the grab bucket 009 is freely dropped into the casing tube 011 for excavation as shown in FIG. 11, when the ground 018 becomes hard, And
When there is reinforced concrete such as a cast-in-place pile in the excavated part, excavation becomes difficult, and there are problems such as generation of vibration and noise when the free-falling grab bucket 009 collides with the hard ground 018 or the like.

The present invention has been made in view of such problems, and ensures that the ground in a casing tube can be efficiently and efficiently reduced even when the ground is hard or when there is reinforced concrete such as a cast-in-place pile at an excavated portion. An object of the present invention is to provide a middle digging excavator capable of digging and discharging with low vibration and noise.

[0012]

In order to achieve the above object, a boring machine according to the present invention comprises a casing tube, pushing means for pushing the casing tube into a drilling portion, and rotating the casing tube. In a drilling device having a rotating means and performing an excavating operation by pushing the casing tube into the excavation portion by the pushing means while rotating the casing tube by the rotating means, which is used in the casing tube, It is characterized by comprising fixing means that can be attached and detached, an openable and closable arm installed below the fixing means, and a cutting bit attached to the arm.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 8 show a middle digging excavator of a digging apparatus according to an embodiment of the present invention. FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a longitudinal sectional view showing an excavating state thereof, and FIGS. 7 is a longitudinal sectional view for explaining a foundation pile removing operation process in the present embodiment, and FIG. 8 is a longitudinal sectional view showing another example of a concrete lump discharging state by a middle excavator in the present embodiment.

First, the configuration of the excavator 100 according to the present embodiment will be described with reference to FIGS. In FIG. 1, the right side (right half) of the center shows a state in which fixing by the gripper device 1 is released.
A state (fixed state) in which the casing tube 011 is gripped by the gripper device 1 is shown on the left side (left half part) of the center.

[0015] In addition, the excavator 100 according to the present embodiment.
Also, for example, the all-casing boring machine 001 described above with reference to FIG. 9, that is, a boring method that is used in a cast-in-place pile method or the like, in which a casing tube 011 is rotated to penetrate the ground (in the ground 018) to excavate a pit. Applied to machine. In the present embodiment, instead of the grab bucket 009 shown in FIG. 9, the excavator 100 is connected to the tip of the wire 010, and the base end side of the wire 10 is fed / wound by the winch 007. The digging excavator 100 is configured to be lowered into the casing tube 011 or suspended from the casing tube 011 while being suspended and supported without free fall.

As shown in FIGS. 1 and 2, the excavator 100 according to the present embodiment is roughly divided into two parts, that is, a gripper device (fixed) detachable from the inside of the casing tube 011. 1) and a digging device 30 provided below the gripper device 1. Here, the gripper device 1 moves the eye plate 2 from the tip of the wire 010 of the boring machine 001.
And can be coaxially attached to and detached from the inner surface of the casing tube 011.
This is for fixing the (digging device 30) in the casing tube 011.

The gripper device 1 includes a weight 3, a cylindrical portion 4, a flange 5,
It has a gripper 6, an upper link 7, a center link 8, a lower link 9, a rotary joint 10, a shaft 11, and a stopper 12. In such a gripper device 1, the eye plate 2 connected to the wire 010 is attached to an upper surface of the rotary joint 10, while a weight 3 is attached to a lower surface of the rotary joint 10. In addition, the rotary joint 10 includes
A shaft 11 arranged coaxially with the casing tube 011 at the time of fixing is projected so as to penetrate the weight 3, and a cylindrical portion 4 is slid up and down along the shaft 11 on the outer periphery on the lower end side of the shaft 11. It is provided as possible. The weight 3 is a casing tube 01
1 to apply a pressing force to the inner peripheral surface of the gripper 6.

The shaft 11 penetrates a hole 4a in the cylindrical portion 4, and has a flange portion 11a formed at the tip (lower end) thereof. The flange portion 11a is configured to be able to slide up and down along the inside of the hole 4b which is larger in diameter than the hole 4b at the lower end side of the cylindrical portion 4, and when the excavator 100 is lifted by the wire 010. In contact with the step 4c formed between the holes 4a and 4b of the cylindrical portion 4 (see the right half of FIG. 1), the digging device 30 below the cylindrical portion 4 is supported. I have.

Further, a flange 5 is formed on the outer periphery of the lower end of the cylindrical portion 4, and a digging device 30 is attached to a lower surface of the flange 5 via a cylinder support 13. The gripper 6 is disposed on the outer periphery of the cylindrical portion 4 and the shaft 11 described above, and when pressed against the inner peripheral surface of the casing tube 011 when being fixed to the casing tube 011, is gripped by the casing tube 011. (Two in the figure) are provided. Each gripper 6 is connected via an upper link 7 to a bracket 3a protruding from the lower surface of the weight 3 and connected via a central link 8 and a lower link 9 to a bracket 4d protruding from the outer periphery of the cylindrical portion 4. Has been
The central link 8 and the lower link 9 form a parallel link.

A rotary joint 10 mounted on the upper part of the weight 3 is connected to a ground hydraulic source (not shown) via a hydraulic hose 20.
0 is always fixed to the casing tube 011 and is rotating with the casing tube 011, so that the rotary joint 10 can always supply the pressurized oil to the inside excavator 100 side. . The pressurized oil supplied to the rotary joint 10 passes through an oil passage (not shown) in the shaft 11 and a hydraulic hose 21, and is supplied to the cylinder 1
4 is supplied.

The stopper 12 is fixed to the upper surface of the flange 5 described above, and is connected by a wire 010 to the excavator 100.
When it is lifted, it comes into contact with the inside of each gripper 6 (see the right half of FIG. 1) to restrict the movement of the gripper 6. On the other hand, the inside digging device 30 includes the gripper device 1.
A pair of excavating arms 1 that are installed below the cylinder via a cylinder support 13 and can be opened and closed by a cylinder 14.
6,16. A cutting bit 19 is attached to each excavating arm 16.

The cylinder support 13 is provided for the gripper device 1.
A cylinder (hydraulic cylinder) 14 is fixedly supported by the cylinder support 13 and fixed to the flange 5 on the side. Cylinder 1
As described above, the hydraulic hose 20, the rotary joint 10, the shaft 1
The pressure oil is guided through the first and hydraulic hoses 21 so that the rod head 17 of the cylinder 14 is driven to expand and contract.

A pair of brackets 15 are attached to the outer periphery on the lower end side of the cylinder 14, and the base end of a digging arm 16 is connected to each bracket 15 with a pin. A link 18 is provided between the rod head 17 and the tip end of each excavation arm 16, and both ends of the link 18 are pin-connected to the rod head 17 and the excavation arm 16, respectively.

In FIGS. 1 and 2, reference numeral 40 denotes a foundation pile as an excavation part. The foundation pile 40 is composed of a reinforcing bar 41 and concrete 42. As shown in the left and right halves of FIG. 1, the distance between the shaft 11 and the cylinder 14 changes between the fixed state and the unlocked state of the gripper device 1, so that a hydraulic hose 21 connecting the shaft 11 and the cylinder 14 is formed. Has an appropriate length so as to absorb the interval fluctuation.

Next, with reference to FIGS. 3 to 7, a description will be given of a removal operation process of the foundation pile 40 by the excavator 100 constructed as described above. In the removal work of the foundation pile 40, first, as shown in FIG. 3, a hole 40a is drilled in the center part of the concrete 41 of the foundation pile 40 using an auger 31 or a down-the-hold drill.

Next, as shown in FIG. 4, the casing tube 011 is penetrated into the outer periphery of the concrete 41 of the foundation pile 40 while rotating by a boring machine 001 (see FIG. 9). Then, the excavator 100 is connected to the wire 0
At 10, it is inserted into the casing tube 011, and the foundation pile 40 is excavated and discharged by the middle excavator 100.
The steps will be described below.

[1] Mounting of the Excavator 100 When the eye plate 2 is lifted by the winch 007 via the wire 010, the weight 3 is pulled up from the center of FIG. 11a comes into contact with the step 4c in the cylindrical portion 4, and the whole excavator 100 is lifted. At this time, each gripper 6 is pulled up by the upper link 7 and drawn inward (to the side of the shaft 11), so that the gripper device 1 is released from the fixed state, and the rod head 17 is pulled up (the cylinder 14 is contracted). State), the excavation arms 16, 16 are in a closed state.

In this state, the wire 010 is paid out from the winch 007, and the excavator 100 is lowered into the casing tube 011 as shown in FIG.
When the digging excavator 100 is supported by the concrete 41 of the foundation pile 40 (upper peripheral surface of the hole 40a) via the cylinder support 13, the wire 010 is loosened, the weight 3 is lowered, and the gripper 6 is moved by the upper link 7. It is pushed out and pressed against the inner wall of the casing tube 011, and the excavator 100 is fixed to the casing tube 011. At this time, the inside digging device 30 is in a state of being fitted into a hole 40 a formed in the foundation pile 40.

[2] Excavation As described above, the middle digging excavator 1 by the gripper device 1 is used.
When the casing tube 011 is rotated in a state where 00 is fixed to the casing tube 011, the boring device 30, that is, the excavating arm 16 also rotates integrally with the casing tube 011. In this state, when pressure oil is supplied to the cylinder 14 from a hydraulic source (not shown) on the ground via the hydraulic hose 20, the rotary joint 10, the shaft 11, and the hydraulic hose 21, the pressure is increased as shown in FIGS. The cylinder 14 is extended by the oil, and the link 18 is extended.
The excavation arm 16 is pushed outward by the drilling, and the reinforced concrete foundation pile 40 (the concrete 41 and the reinforcing steel 4
2) is cut.

[3] Discharge of the earth After the cylinder 14 is extended and the excavating arm 16 is extended outward as described above to excavate the reinforced concrete foundation pile 40, the excavating arm 16 is extended outward as shown in FIG. When the wire 010 is wound up by the winch 007 and the excavator 100 is pulled up in the state of being held, the gripper device 1 is released from gripping in the same manner as described above. In this state, the excavator 100 is pulled out of the casing tube 011 and taken out, the cylinder 14 is contracted on the ground, the excavation arm 16 is closed, and the excavated reinforced concrete block 40b is discharged.

By repeatedly performing the above-described working steps, the foundation pile 40 is removed. In addition, in addition to the above-described excavation method, in the middle excavator 100 of the present embodiment, the pair of excavation arms 1
By driving the opening and closing of the rocks 6 and 16, as shown in FIG. 8, the rock or the concrete block 42 a can be grasped and discharged by the excavation arm 16.

As described above, according to the inside excavator 100 of the excavator as one embodiment of the present invention, the excavation arm 1
6, a drill bit 19 is provided and drilling can be performed by using the rotation of the casing tube 011. Therefore, it is possible to cope with digging of reinforced concrete or rock mass. Even in some cases, the ground 018 (including reinforced concrete) in the casing tube 011 can be reliably and efficiently excavated and discharged.

Further, as in the prior art, a grab bucket (FIG. 9)
No. 009) falls freely and does not excavate,
Even when the excavation part is hard ground or reinforced concrete, excavation and discharge can be performed while maintaining low vibration and low noise. Further, in the present embodiment, the reinforced concrete or the like is not finely crushed, but the reinforced concrete or the like is removed in a large lump (see reference numeral 40b in FIG. 7).
And the work efficiency is greatly improved. In addition, the digging arms 16 and 16 can grasp and discharge a reinforced concrete block (see reference numeral 42a in FIG. 8) and the like.
There are also advantages such as extremely high versatility.

In the above embodiment, the weight 3
However, the present invention is not limited to this. For example, the pressing force may be applied to the gripper 6 by a hydraulic cylinder or the like. In this case, the same operation and effect as described above can be obtained. In the embodiment described above,
Although the case where the foundation pile 40 made of reinforced concrete is removed has been described, the present invention is not limited to this. When excavating and forming a vertical hole in the ground, such as a cast-in-place pile construction for constructing a foundation pile, It is applied in the same manner as in the above-described embodiment, and the same operation and effect as described above can be obtained.

[0035]

As described above in detail, according to the inside excavator of the excavator of the present invention, the fixing means detachable from the inside of the casing tube, and the open / close mechanism installed below the fixing means. With a very simple configuration that includes a possible arm and a cutting bit attached to this arm, the arm is integrated with the casing tube by opening and closing it with the arm fixed to the casing tube by fixing means. The excavation part in the casing tube will be excavated while rotating, and after the excavation is completed,
The fixed state by the fixing means is released, the arm is taken out from the casing tube, and the earth is discharged.

Therefore, according to the present invention, the following effects or advantages can be obtained. (1) Since drilling can be performed using the rotation of the casing tube provided with a cutting bit on the arm, it can also be used for excavation of reinforced concrete or rock mass. Even if there is, the ground in the casing tube can be reliably excavated and discharged efficiently.

(2) Since the grab bucket is free-falled and excavated as in the prior art, excavation and discharge with low vibration and low noise can be realized even when the excavated portion is hard ground or reinforced concrete. (3) Reinforced concrete and the like can be removed in large blocks, so that the rebar is less entangled and the work efficiency is greatly improved.

(4) Since lumps of reinforced concrete can be grasped and discharged by the arm, versatility is extremely high.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a middle excavator of an excavator according to an embodiment of the present invention, in which a right half portion is unlocked and a left half portion is fixed by the gripper device. Indicates the status.

FIG. 2 is a vertical cross-sectional view showing a state of excavation by a middle excavator according to the embodiment.

FIG. 3 is a longitudinal sectional view for explaining a foundation pile removal operation process in the embodiment.

FIG. 4 is a longitudinal sectional view for explaining a foundation pile removal operation process in the present embodiment.

FIG. 5 is a longitudinal sectional view for explaining a foundation pile removal operation process in the embodiment.

FIG. 6 is a longitudinal sectional view for explaining a foundation pile removal operation process in the present embodiment.

FIG. 7 is a longitudinal sectional view for explaining a foundation pile removal operation process in the present embodiment.

FIG. 8 is a longitudinal sectional view showing another example of the state of discharging the concrete lump by the middle excavator of the embodiment.

FIG. 9 is a schematic side view showing a schematic configuration of a general all-casing boring machine.

FIG. 10 is a longitudinal sectional view showing a casing tube in a general all-casing boring machine.

FIG. 11 is a schematic diagram for explaining an excavation operation in a casing tube in a general all-casing boring machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gripper apparatus (fixing means) 6 Gripper 16 Excavating arm 19 Cutting bit 30 Middle digging apparatus 40 Foundation pile (digging part) 100 Medium digging excavator 011 Casing tube 012 Pushing apparatus (pressing means, rotating means)

Claims (1)

[Claims] 1. A casing tube, a pushing means for pushing the casing tube into an excavating portion, and a rotating means for rotating the casing tube, wherein the casing tube is excavated by the pushing means while being rotated by the rotating means. An excavating machine for excavating work by pushing into a casing part, wherein the excavating machine is used inside the casing tube, and is fixed below the fixing means. And a cutting bit attached to the arm.