JPH0533342A - Device for removing existing concrete pile - Google Patents

Abstract

PURPOSE:To remove a concrete pile without difficulty by providing an auger shaft expanding/contracting mechanism between a rotation driving means and an auger shaft while providing a easing expanding/ contracting mechanism between the rotation driving means and a casing. CONSTITUTION:A casing 13 is inserted onto the head of an existing concrete pile P and the head of the pile is held with the casing 13. As the easing 13 is extended by operation of a easing expanding/contracting mechanism 12, soil around the pike P is excavated with an excavating edge 14. As the excavation progresses to a certain extent, an auger shaft 7 is extended by operation of an auger shaft expanding/contracting mechanism 6 and a crushing edge 9 is made to come into contact with the head of the pile P, and the crushing is started. As the crushing edge 9 approaches the lower end of the casing 13, excavation is further progressed while the casing 13 is lowered by operation of the casing expanding/contracting mechanism 12. The auger shaft 7 and the casing 13 are alternately lowered afterward and the crushing is progressed up to the lower end of the pile P, and thereby removal of the pile is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing concrete pile removing apparatus for crushing and removing concrete piles, concrete piles and the like (hereinafter simply referred to as concrete piles) remaining in the ground after dismantling an existing building.

[0002]

2. Description of the Related Art When an old building is dismantled and a new building is constructed at the site, it is necessary to remove the concrete piles driven into the ground because they are an obstacle. As an example of this type of removing device, a crushing device for a concrete pile that crushes the head end surface of the concrete pile to remove the driven pile is known.

This concrete pile crushing device is a so-called lock auger, in which the rotation driving means is composed of two motors, one motor is connected to the auger shaft, and the other motor is composed of a steel pipe. The casings are connected.
A crushing blade for crushing the head end surface of the concrete pile is provided at the lower end of the auger shaft, and a digging blade for digging the outer peripheral soil of the concrete pile is formed at the lower peripheral edge of the casing.

Next, a case where the existing concrete piles remaining in the ground are removed by this crushing apparatus for concrete piles will be described.

First, an auger shaft is built on the head of an existing concrete pile, a casing is inserted into the outer peripheral portion of the existing concrete pile, and the casing is rotated and driven, and the outer periphery of the existing concrete pile is excavated by an excavating blade. Excavate the soil. Further, the auger shaft is reversely rotated and lowered so that the crushing blade is located above the digging blade of this casing. Then, the soil around the existing concrete pile is excavated by the digging blade, and the head end surface of the existing concrete pile is crushed by the crushing blade. At this time, since the auger shaft is provided with the screw, the crushed concrete fragments can be discharged by the screw, and the existing concrete pile is removed from the ground.

[0006]

By the way, in the conventional crushing device for existing concrete piles described above, since the rotary driving means is composed of two motors, the structure of the entire device becomes complicated and the structure on the upper side is increased. There was a drawback that the weight increased and the stability deteriorated. Further, the auger shaft and the casing are usually attached corresponding to the length of the concrete pile, and when crushing the concrete pile, excavation of the outer peripheral soil is always preceded. However, since the lengths of the auger shaft and the casing are constant and cannot be adjusted, there are various problems in the removal work.

First, since a casing is inserted into a concrete pile and the auger shaft and the casing are hung down for excavation, if the existing concrete pile is buried in a slanted state, it may be impossible to crush during the excavation. Occurs.

That is, since the concrete pile is inclined, the concrete pile, the auger shaft, and the casing may not be aligned with each other in a dogleg shape, and it may be difficult to lower the casing. Here, since the crushing blade is in the upper part of the excavating blade and has a relationship to follow, it is not possible to crush the head end surface of the concrete pile prior to excavation, so crushing occurs at the casing stop position. It will stop and the lower end of the concrete pile will remain underground. At this time, if the auger shaft and the casing are forcibly driven to descend, the concrete pile will buckle and the removal work cannot be continued.

Further, in the case where only one relatively short concrete pile is buried, it is easy to remove the concrete pile by the pair of auger shafts and the casing. However, this auger shaft and casing
Since the length cannot be adjusted and the connecting means is not normally provided, if the concrete pile is long and connected, the concrete pile may not be removed by one operation. In this case, it is necessary to replace it with one that fits the length of the concrete pile, but this replacement involves the work of pulling out and inserting the auger shaft and casing again, and this replacement work is both troublesome and removal work. It had the drawback of lengthening the time.

An object of the present invention is to solve the above problems.

[0011]

In order to achieve the above object, the present invention provides an auger shaft connected to a rotary drive means and a crushing unit provided at the lower end of the auger shaft for crushing the head of a concrete pile. A blade, a casing that is connected to the rotation driving means and rotates in a direction opposite to the auger shaft, an excavation blade that is formed at a lower end portion of the casing and excavates soil in an outer peripheral portion of a concrete pile, and the rotation driving means. And an auger shaft, and an auger shaft expanding / contracting mechanism for adjusting the length of the auger shaft, and a casing expanding / contracting mechanism for adjusting the length of the casing, which is interposed between the rotation driving means and the casing. It is equipped with and.

[0012]

[Operation] With the above structure, when removing a long existing concrete pile, an auger shaft is installed on the head of this concrete pile, and the casing expansion mechanism is driven to extend the casing and insert it into the head of the concrete pile. .. In this state, the crushing blade is located above the excavating blade.

Next, when the rotation driving means is driven, the soil on the outer peripheral portion of the concrete pile is excavated by the excavating blade. At this time, if the auger shaft expansion / contraction mechanism is driven to extend the auger shaft, the head of the concrete pile is crushed.

Then, when the crushing blade approaches the lower end of the casing, the casing is lowered to excavate the soil. Then, when the auger shaft is extended again and lowered when excavated to some extent, the head of the concrete pile is crushed by the crushing blade. By repeating such an operation and continuing the crushing, it is possible to remove up to the lower end portion of the concrete pile.

Here, when the concrete pile, the auger shaft and the casing are not coaxial with each other due to the inclination of the concrete pile and it is difficult to lower the casing, the auger shaft is lowered to crush. Subsequently, thereafter, the operation of moving the excavating blade and the crushing blade closer to or away from each other is repeated by alternately lowering the casing and the auger shaft.

At this time, if the head of the concrete pile is constantly gripped and the crushing is proceeded, the casing can be made to follow the inclination of the concrete pile, and the crushing can be performed without stopping the casing midway. I can continue.

When the concrete pile is long, there is a case where the auger shaft cannot be crushed due to an insufficient length of the auger shaft. In this case, the casing expansion mechanism and the auger shaft expansion mechanism are operated to operate the casing. Extend the auger shaft. As a result, the crushing of the concrete pile can be promoted, and therefore even a concrete pile of a considerably long length can be removed.

[0018]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of an existing concrete pile removing device. This existing concrete pile removing device is provided with a driving device 4 on a leader mast 2 of a crawler crane 1, and an auger shaft expanding / contracting mechanism 6 and a casing expanding / contracting mechanism 12 are arranged in the driving device 4 via a rotation transmission mechanism 5. It is set up. The auger shaft 7 provided with a screw 8, a crushing blade 9 and a guide member 11 is provided in the auger shaft expanding / contracting mechanism 6, and the excavating blade 14 is provided in the casing expanding / contracting mechanism 12.
The casings 13 provided with are connected to each other, and the existing concrete piles P buried in the ground are crushed.

The drive unit 4 contains a motor and a speed reducer in a main body case 4a. And body case 4
A wire 3 is stretched between the upper part of a and the headstock 2a of the leader mast 2, and a guide portion 4b is provided on a side portion of the main body case 4a. Thereby, the drive device 4 is
By winding and unwinding the wire 3, the leader mast 2
It is movable up and down along the guide rail 2b. Two
Reference numeral c is an antivibration tool for the casing 13.

The rotation transmission mechanism 5 is a conventionally well-known donut auger system, has a chuck 5a, and a shaft (not shown) connected to a speed reducer of the drive unit 4 and provided on this shaft. A gear and an internal gear and an external gear that mesh with the gear are provided.

The chuck 5a comprises a fixed portion and a rotating portion, and the fixed portion is fixed to the lower portion of the main body case 4a.
On the other hand, the inner tooth gear is formed on the inner peripheral surface of the rotating portion, and the casing expansion / contraction mechanism 12 is connected to the rotating portion. The external gear is fixed to the rod 5b, and the auger shaft extension / contraction mechanism 6 is connected to the rod 5b. As a result, when the rotation transmission mechanism 5 is interlocked with the rotational drive of the motor and the auger shaft expansion / contraction mechanism 6 rotates in the forward direction, the casing expansion / contraction mechanism 12 rotates in the reverse direction.

As shown in FIG. 2, the auger shaft expanding / contracting mechanism 6 has a space between the upper support member 15 and the lower support member 16 and is arranged between the upper support member 15 and the lower support member 16.
Book hydraulic cylinders 17 and 18 are provided. And
A guide rod 19 is integrally fixed to the upper support member 15, and a guide portion 20 is integrally fixed to the lower support member 16. In addition, the upper support member 16 has a male joint 21.
However, the female joints 22 are fixedly attached to the lower support member 12. Further, the male joint 21 is connected to the rod 5b to which the external gear is fixed, while the female joint 22 is connected to the upper end of the auger shaft 7. The auger shaft extension / contraction mechanism 6 is housed in the main body portion 12a of the casing extension / contraction mechanism 12, the female joint 21 projects from the main body portion 12a, and the auger shaft 7 is detachable.

The hydraulic cylinders 17 and 18 are connected to a hydraulic device (not shown). When the hydraulic device is driven to operate the hydraulic cylinders 17 and 18, the guide rod 19 is moved.
The guide portion 20 expands and contracts along the length of the auger shaft 7 so that the entire length of the auger shaft 7 can be freely adjusted. In this example, the hydraulic cylinders 17, 1
Although the auger shaft 7 can be extended by about 3 m by 8, the auger shaft 7 can be extended further by setting the lengths of the hydraulic cylinders 17 and 18 and each part as needed.

As shown in FIG. 3, the auger shaft 7 is provided with a screw 8 for discharging the fragments of the concrete pile P on the outer periphery thereof, and a rod 10 is detachably connected to the lower end thereof. Then, a crushing blade 9 for crushing the head of the concrete pile P is fixed to the rod 10, and a guide member 11 to be inserted into the hollow hole of the concrete pile P is attached to the lower end of the rod 10. .. The auger shaft 7 is moved up and down in a casing 13 described later by the operation of the auger shaft extension / contraction mechanism 6, and the crushing blade 9 is moved from the lower end thereof.
Is supposed to appear and disappear.

As shown in FIG. 4, the casing expanding / contracting mechanism 12 has a connecting portion 25 formed in a main body portion 23.
A flange 24 is integrally formed on the upper portion. Body 23
Is made of a cylindrical steel pipe, and a pair of guide grooves 26, 26 are formed in the lengthwise direction at opposing portions of the peripheral surface. On both sides of these guide grooves 26, 26, there are concave connecting portions 27a, 27b ... For adjusting the overall length of the casing 13 freely.
., And 28a, 28b, ... Are provided in four pairs with the same pitch.

The flange 24 has a plurality of bolt holes 24a formed therein. Bolts are inserted through the bolt holes 24a and screwed into the screw holes of the chuck 5a so that the main body portion 23 is chucked.
It is configured to be fixed to a. As a result, when the motor is rotationally driven and the internal gear of the rotation transmission mechanism 5 is reversely rotated, the casing expansion / contraction mechanism 12 rotates the casing 13 by interlocking the chuck 5a and the main body 23. The flange 24 is not exposed by the cover mounted on the upper end of the main body 23.

As shown in FIG. 3, the casing 13 is provided with an excavating blade 14 at the lower end thereof, and the casing expansion / contraction mechanism 7 is interlocked with the rotational driving of the motor, and the casing 1
When 3 descends, the soil around the concrete pile P is excavated. As shown in FIG. 4 and FIG. 5, the casing 13 has an interval equal to the pitch of the concave connecting portions 27a, 27b ... and 28a, 28b .. Two projecting connecting portions 13a and 13b are provided so as to project. The convex connecting portions 13a, 13b are engaged with either of the concave connecting portions 27a, 27b ... Or 28a, 28b .. ing.

That is, when adjusting the length of the casing 13, for example, the uppermost concave connecting portions 27a, 27b ...
Or 28a, 28b ... One of the convex connecting portions 13a,
When the casing 13 is extended while the 13b is engaged, first, the drive device 4 is lowered to lower the main body 2
The lower end of the casing 13 connected to 3 is grounded to the ground.

Next, the motor is driven to rotate the main body portion 23 to align the convex connecting portions 13a and 13b with the center of the guide groove 26. Then, after raising the drive device 4,
The main body 23 is rotated leftward or rightward. Then, the concave connecting portions 27a, 27b ... Or 28a, 28b ...
The engaging positions of the convex connecting portions 13a and 13b are changed so that the casing 13 can be extended by a required length.

In this example, the casing 13 can be extended by about 3 m by adjusting the casing expansion / contraction mechanism 6 together with the auger shaft 7 by the auger shaft expansion / contraction mechanism 6. In addition, as a modified example of the casing 13, extension casings 29 and 30 are provided so as to correspond to a considerably long concrete pile P or a connected concrete pile P. The extension casing 29 shown in FIG. 6 has two convex connecting portions 2 on the outer peripheral surface on the upper side similarly to the casing 13.
While each pair of 9a and 29b is provided, one on the outer peripheral surface on the lower side
A pair of individual engaging grooves 29c are formed.

Further, the extension casing 30 shown in FIG.
Has one convex connecting portion 30a on the outer peripheral surface on the upper side, and one engaging groove 30b on the outer peripheral surface on the lower side. Thereby, when connecting the extension casings 29 and 30, the concave connecting portions 27a and 27 of the main body portion 23 are connected.
The convex connecting portions 29a and 29b of the extension casing 29 are engaged with b or 28a and 28b to connect the extension casing 29 to the casing 13.

After this, the engaging groove 2 of the extension casing 29
The convex connecting portion 30a of the extension casing 30 is engaged with 9c to connect the extension casing 30 to the casing 29. The convex connecting portion 13a of the casing 13 may be engaged with the engaging groove 30c to connect the casing 13 to the extension casing 30 or the casing 13 to the extension casing 29. Next, the crushing work of the concrete pile by the above-mentioned existing concrete pile removing device will be described.

In this example, the case of removing the long concrete pile P will be described. First, as shown in FIG. 8, the auger shaft 7 is built on the head of the concrete pile P.
In this state, the crushing blade 9 is retracted into the casing 13 and is positioned above the excavating blade 14.

Next, the drive means 4 is rotated and lowered to insert the casing 13 into the head of the concrete pile P. Then, the head is gripped by the casing 13. In this state, the casing expansion / contraction mechanism 12 is driven to drive the casing 1
When 3 is extended, the excavating blade 14 excavates the soil on the outer peripheral portion of the concrete pile P.

When this excavation progresses to a certain extent, the auger shaft expansion / contraction mechanism 12 is driven to extend the auger shaft 7, and the crushing blade 9 is brought into contact with the head of the concrete pile P as shown in FIG. 9 to start crushing. At this time, since the casing 13 covers the concrete pile P, noise generated due to the crushing is suppressed and dust is prevented from scattering. When the crushing progresses and the crushing blade 9 approaches the lower end of the casing 13, the casing expanding / contracting mechanism 12 is adjusted and the casing 13 is lowered by the above-described method to excavate the soil.

Here, when the soil is excavated to some extent, the auger shaft 7 is extended again and the crushing blade 9 is extended as shown in FIG.
The head of the concrete pile P is crushed by. Such an operation is repeated mainly on the upper side of the concrete pile P. After that, if the driving means 4 is lowered and the crushing is continued, the concrete pile P can be removed to the lower end. By the way, although the concrete pile P may be buried in an inclined manner, this removal device allows the removal work to be continued without trouble.

That is, since the concrete pile P is inclined, the concrete pile P, the auger shaft 7 and the casing 1 are
When 3 is not on the same axis, the casing 13 stops at the V-shaped portion. In such a case, the crushing is performed until the crushing blade 9 approaches the lower end of the casing 13.

After that, the casing 13 and the auger shaft 7 are held while the head of the concrete pile P is being held by the casing 13.
By alternately lowering and, the excavating blade 14 and the crushing blade 9 are moved closer to or apart from each other. As a result, since the crushing proceeds while the head of the concrete pile P is constantly gripped, the casing 13 can be made to follow the inclination of the concrete pile P, and the buckling of the concrete pile P also occurs. Since it is prevented, the lower end of the concrete pile P can be removed.

According to the existing concrete pile removing apparatus of the present invention, so-called lock and soil work can be performed in addition to the above-mentioned removing work.

For example, as shown in FIG. 11 and FIG. 12, the existing concrete pile P buried in the second basement (F2) part is used from the first basement (F1) to the second basement (F2).
It can also be crushed through the floor surface of. In this case, first, the auger shaft 7 is built on the floor surface of the first basement floor on the head of the concrete pile P remaining in the ground. Next, the casing 13 is inserted into the through hole formed in the floor surface to reach the floor surface of the second basement floor, and the casing 13 is inserted into the through hole of the second basement floor as shown in FIG. Then, as described above, the casing expanding / contracting mechanism 12 is adjusted and the casing 13 is lowered to proceed with soil excavation. Then, the hydraulic cylinders 17 and 18 of the auger shaft extension / contraction mechanism 6 are operated to operate the auger shaft 7.
The concrete pile P is crushed while extending. Also at this time, the crushing work is effectively performed by alternately operating the casing expansion / contraction mechanism 12 and the auger shaft expansion / contraction mechanism 6. Here, when the concrete pile P is long and the auger shaft 7 cannot reach, the extension casing 29 is connected to the casing expansion / contraction mechanism 12, and the casing 13 is connected to the extension casing 29. Then, as shown in FIG. 12, the casing can be doubled in length, so if the crushing of the concrete pile P is promoted, the concrete pile P buried in the lower part of the second basement can be removed on the first basement. Is.

As described above, since the auger shaft expanding / contracting mechanism 6 and the casing expanding / contracting mechanism 12 of the present invention are expandable / contractible, in addition to the above, for example, the crawler crane 1 at the time of installation.
If the leader mast 2 cannot be raised, the casing 13
By shortening the lengths of the auger shaft 7 and the auger shaft 7 and extending them after they are built, the removal work can be performed without trouble even in a place where space cannot be secured.

When the concrete pile P is long, the auger shaft 7 of a normal size may be too short to proceed with the removal work. By activating the mechanism 12 to extend the auger shaft 7 and the casing 13, the crushing of the concrete pile P can be continued, so even a concrete pile P of a considerably long length can be removed in one operation. Becomes

[0043]

As described above, according to the present invention, the operation of crushing the head of the concrete pile with the crushing blade by extending the auger shaft at the time of excavating the soil while lowering the casing and excavating the soil to some extent. By repeating, it is possible to remove up to the lower end of the concrete pile. Therefore, even when the concrete pile is buried in a slanted state, by cascading the casing and the auger shaft alternately, the crushing can be advanced according to the inclined state of the concrete pile. The concrete is crushed without stopping in the middle, and there is an effect that it can be removed without leaving the concrete pile.

In the case where the concrete pile is long, even if the auger shaft cannot be crushed due to the insufficient length of the auger shaft, the casing expanding and contracting mechanism and the auger shaft expanding and contracting mechanism are operated to form the casing. Since the crushing of the concrete pile can be continued by extending the auger shaft, there is also an advantage that the concrete pile can be removed in one operation even if the concrete pile has a considerably long length.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a front view of an auger shaft extension / contraction mechanism.

FIG. 3 is a sectional view of an auger shaft and a casing.

FIG. 4 is a perspective view of a casing expansion / contraction mechanism.

FIG. 5 is a plan view of a casing.

FIG. 6 is a perspective view of an extension casing.

FIG. 7 is a perspective view of another extension casing.

FIG. 8 is an explanatory diagram showing a state in which the casing is extended to excavate the soil.

FIG. 9 is an explanatory view showing a state in which the auger shaft is extended and the existing pile is crushed.

FIG. 10 is an explanatory view showing a removing operation for alternately extending the casing and the auger shaft.

FIG. 11 is an explanatory view showing a state in which the work for removing the existing piles on the second basement portion is started.

FIG. 12 is an explanatory diagram showing a crushed state of existing piles on the second basement.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crawler crane 2 Leader mast 4 Drive device 5 Rotation transmission mechanism 6 Auger shaft expansion / contraction mechanism 7 Auger shaft 9 Crushing blade 12 Casing expansion / contraction mechanism 13 Casing 14 Excavation blade P Existing concrete pile

Claims (1)

Claims: 1. An auger shaft connected to a rotation drive means,
Provided at the lower end of the auger shaft, a crushing blade for crushing the head of the concrete pile, and connected to the rotation driving means,
A casing that rotates in the opposite direction to the auger shaft, a drilling blade that is formed at the lower end of the casing and excavates the soil in the outer peripheral portion of the concrete pile, and is provided between the rotation driving means and the auger shaft, An existing concrete pile removing device comprising an auger shaft expanding / contracting mechanism for adjusting the length of the auger shaft, and a casing expanding / contracting mechanism interposed between the rotation driving means and the casing for adjusting the length of the casing. ..