JP7176715B2 - Concrete pile removal method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a concrete pile removal head and a concrete pile removal method, and more particularly to a concrete pile removal head and a concrete pile removal method for crushing and removing concrete piles placed in the ground. .

BACKGROUND ART When constructing a building, piles are embedded in the ground in order to support the weight of the building and transfer it to the firm ground. As a pile to be buried in the ground, a concrete pile is used, which is made by integrating concrete into a cylindrical shape with a plurality of pre-tensioned steel materials such as PC steel wires to achieve high strength and high yield strength. When such a building is dismantled and a new building is built on its site, the building on the ground must first be dismantled, and then the concrete remaining in the ground will be removed. The piles (=remaining piles) will be removed, and construction will be carried out on the vacated site for the construction of a new building.

For example, Patent Documents 1 to 3 disclose methods for removing residual piles that have been conventionally performed. The construction method shown in Patent Document 1 pulls up the pile while injecting a backfilling agent into the outer peripheral portion of the pile. The pile is removed by excavating while rotating, and the method shown in Patent Document 3 crushes the residual pile while winding the steel material in the residual pile in the excavation pit inside the excavation pit, and then crushes the residual pile while the steel material is wound. It lifts the drilling and crushing equipment.

In addition, the pile crushing device shown in Patent Document 4 crushes and removes piles, and has a crushing shaft consisting of an inner shaft for crushing the central portion of the pile and an outer shaft for crushing the peripheral portion of the pile. It is configured. Furthermore, the crushing processing method and apparatus shown in Patent Document 5 include an excavating head that crushes the top of the underground pile P while excavating the soil radially outside the underground pile P, and the excavating head provided with the crushing head. A crushing head is provided integrally with the casing, and crushes the underground pile while discharging the crushed material falling into the annular gap between the inner circumference of the casing and the outer circumference of the underground pile from the discharge port to the outer circumference side of the casing. It is something to do.

JP 2012-112149 A JP 2012-219568 A JP 2017-71952 A Japanese Patent Application Laid-Open No. 2006-233427 JP 2008-163552 A

However, the methods and devices disclosed in Patent Literatures 1 and 2 require a device equipped with a power for pulling out the pile from the ground, so there is a problem that the size of the device increases and the working place is limited. In the construction method shown in Patent Document 3, the concrete portion is crushed by forcibly wrapping the steel material around the lower end of the excavating/crushing device. If it comes off by doing something like this, it may be difficult to re-wrap it. Furthermore, the existing pile crushing device shown in Patent Document 4 is equipped with a central crushing body for crushing the center and a peripheral crushing body for crushing the peripheral edge, but maintenance including replacement when the blade is worn is required. It is not easy, and there is a possibility that the cost will rise due to the complexity of the structure of the crushed body. Similarly, the crushing processing method and the crushing processing apparatus shown in Patent Document 5 are not easy to maintain, including replacement when the blade is worn, and the drilling head, the crushing head, and the casing integrated with the crushing head , the size of the apparatus is inevitably increased.

Therefore, the present invention has been made in view of the above problems, and provides a concrete pile removal method capable of crushing without pulling out the pile with a simple structure and discharging the crushed material to the ground side. With the goal. Another object of the present invention is to provide a method for removing concrete piles that facilitates the discharge of the crushed material after crushing the concrete piles and that enhances maintainability.

In order to solve the above-mentioned problems, the present invention as set forth in claim 1 is a removal head used in a concrete pile removal device for crushing and removing concrete piles placed in the ground, wherein the removal head has a cylindrical casing, a plurality of peripheral edge crushing carbide bits for crushing the peripheral edge of the concrete pile arranged along the circumferential direction on the lower side of the casing, and inside the casing There are a plurality of cemented carbide bits arranged in the diameter direction of the casing, and for crushing the center part of the concrete pile arranged with inclination so that the tip direction of each cemented carbide bit is different. A concrete pile removal method using a concrete pile removal head equipped with a cemented carbide bit for crushing the center of A step of attaching a head, and a step of crushing from the upper end side of the concrete pile placed in the ground by rotating the auger screw and the removal head with a driving device arranged on the upper side of the auger screw. It is characterized by having

In order to solve the above problems, the present invention according to claim 2 is a concrete pile removal method according to claim 1 , in which a backfilling material or a solidifying material is injected into the pile hole after removing the crushed material. and a step of backfilling.

In order to solve the above problems, the present invention according to claim 3 is the concrete pile removal method according to claim 2 , comprising the step of driving a stress material into the pile hole after removing the crushed material. It is characterized by

According to the concrete pile removal head according to the present invention, a plurality of peripheral edge crushing carbide bits arranged around the casing and a plurality of them are arranged along the diameter direction of the casing and their tips are inclined. By providing the cemented carbide bit for crushing the center portion, the bit can reliably contact the entire pile, so that the crushing operation can be performed reliably. In addition, since the head can be made smaller and lighter, it is possible to work with a small backhoe, and there is an effect that the work can be carried out at any work site.

Further, according to the method for removing concrete piles according to the present invention, since the piles driven into the ground are sequentially crushed from the upper end side while rotating the removing head by the auger screw, the piles are pulled out. Moreover, as a result of performing crushing and discharge of the crushed material in a series of operations, piles can be efficiently removed.

1 is a front view showing an embodiment of a concrete pile removal head according to the present invention; FIG. Figure 2 is a bottom view of the removal head shown in Figure 1; FIG. 11 is a bottom view of another embodiment of an ablation head; BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows each process in one Embodiment of the removal method of the concrete pile which concerns on this invention, (a) is explanatory drawing which shows the setting state of the removal head, (b) is an initial state of excavation and crushing. (c) is an explanatory drawing showing the state of completion of excavation and crushing, and (d) is an explanatory drawing showing the state in which the removal head and the auger are pulled up. FIG. 5 is an explanatory diagram showing the process following FIG. 4 , (a) is an explanatory diagram showing the backfilling process of the pile hole, and (b) is an explanatory diagram showing the completion of the backfilling of the pile hole. BRIEF DESCRIPTION OF THE DRAWINGS It is a flowchart which shows 1st embodiment of the removal method of the concrete pile which concerns on this invention. Another embodiment of the removal method of the concrete pile according to the present invention is shown, (a) is an explanatory view of the backfilling work of the pile hole, (b) is an explanatory view of the end of the backfilling of the pile hole.

[Construction of Concrete Pile Removal Head]
Hereinafter, a concrete pile removing head and a concrete pile removing method according to the present invention will be described in detail based on a preferred embodiment. FIG. 1 is a front view showing one embodiment of a concrete pile removing head according to the present invention, and FIG. 2 is a bottom view of the removing head of FIG.

A concrete pile removal head (hereinafter simply referred to as "removal head") 1 generally includes a columnar (or cylindrical) shaft 2 and a spiral blade spirally provided on the outer periphery of the shaft 2. 3, a casing 4 provided in the lower part of the spiral blade 3, and a plurality of first carbide bits (peripheral crushing carbide bits) detachably attached so as to surround the lower peripheral edge of the casing 4. 5 and, as shown in FIG. It is configured with a cemented carbide bit (central portion crushing cemented carbide bit) 6 . The removal head 1 configured in this way is attached to the tip of an auger screw 17 suspended from a heavy machine such as a pile extractor, which will be described later, and the concrete buried in the ground is removed as the auger screw 17 rotates. Pile crushing and removal will be carried out.

The spiral blade 3 is made of a metal material such as iron, and has the function of guiding upward the crushed material crushed by the first cemented carbide bit 5 and the second cemented carbide bit 6 as the shaft 2 rotates. is responsible for The casing 4 functions as a housing for mounting the first cemented carbide bit 5 and the second cemented carbide bit 6 and is reinforced by the frame member 7 . The inside of the casing 4 is open so that the crushed material crushed by the first cemented carbide bit 5 and the second cemented carbide bit 6 can pass through the inside of the casing 4. The crushed material passing through the inner side is guided upward (on the ground) as the spiral blade 3 rotates.

The first cemented carbide bit 5 and the second cemented carbide bit 6 are formed using a material that does not cause much wear even if an existing pile (not shown) is crushed. Specifically, it is formed of a sintered composite material obtained by sintering a powder of a material with high hardness (such as carbide of tungsten) with an iron group metal such as iron, cobalt, or nickel. The shape and arrangement of the first cemented carbide bit 5 and the second cemented carbide bit 6 are different. That is, since the first cemented carbide bit 5 has the role of crushing the periphery of the concrete pile, the tip shape is formed in a plate shape, and the tip surface is inclined with a difference in the height direction. It has a portion 5a. In this embodiment, eight of the first cemented carbide bits 5, 5 are arranged along the periphery of the lower end of the casing, and the first cemented carbide bits 5, 5 can be easily replaced when worn. is fixed to the casing 4 by bolting. As a result, even when the wear of the first cemented carbide bits 5, 5 progresses, they can be easily replaced, and the performance is maintained.

On the other hand, in this embodiment, eight second cemented carbide bits 6 are also arranged, and are attached at regular intervals while drawing a substantially S-shape along the diametrical direction inside the casing 4 . As shown in FIG. 2, each of the second cemented carbide bits 6 has a cylindrical shape and is arranged so that its tip surface is located above the height position of the first cemented carbide bit 5. there is The second cemented carbide bit 6 is detachable by a spring pin (not shown) provided in a holder 6a fixed to the casing 4. As shown in FIG. As shown in FIG. 2, the second carbide bits 6, 6 are arranged such that their tips form an S-shape as a whole when viewed from the bottom. It is arranged at an angle so that Since the second cemented carbide bit 6 is arranged in an S-shape in this manner, the concrete pile can be contacted not only from the same direction but from multiple directions. can be crushed into

Another embodiment of the removal head 1 is shown in FIG. The removal head 1 shown in FIG. It comprises a plurality of second cemented carbide bits (central crushing cemented carbide bits) 6 arranged in the diametrical direction of the casing 4 so as to be located inside and above the hard bits 5. there is In this embodiment, the second cemented carbide bits 6 are arranged in a straight line, but the tip of the second cemented carbide bit 6 is directed toward the concrete pile as the removal head 1 rotates. It is attached to the concrete pile so that it can reliably crush concrete piles. Since other configurations are the same as those of the above-described embodiment, the same reference numerals are given and the description thereof is omitted.

[Method for removing concrete piles]
Next, a concrete pile removing method using the removing head 1 described above will be described. FIG. 4 is an explanatory diagram showing each step in one embodiment of the concrete pile removing method according to the present invention, (a) is an explanatory diagram showing the set state of the removal head, and (b) is the initial stage of excavation and crushing. (c) is an explanatory view showing the state of completion of excavation and crushing, and (d) is an explanatory view showing the state in which the removing head and the auger are pulled up. 5A and 5B are explanatory views showing the steps following FIG. 4, where (a) is an explanatory view showing the backfilling process of the pile holes, and (b) is an explanatory view showing the completion of the backfilling of the pile holes. FIG. 6 is a flow chart showing a first embodiment of the method for removing concrete piles according to the present invention.

Heavy machinery 10 used for removing concrete piles includes a truck crane type and a crawler crane. Here, a truck crane type as shown in FIG. 4(a) is used. A heavy machine 10 includes a vehicle body 12 having a crane (or a stay cylinder) 11 that can extend and retract upward, a leader 13 vertically installed between the tip of the crane 11 and the ground, and a wire rope extending from the tip of the crane 11. 15, an auger screw 17 that descends and rises along the leader 13 in a state of being arranged at the lower end of the driving device 14, and an auger screw 17 that is attached to the lower side of the leader 13 and rotates. It is configured with a vibration-retaining device 16 that prevents the vibration of the camera.

First, as shown in FIG. 4A, the removal head 1 is attached to the lower end of the auger screw 17 (step S1). After positioning the auger screw 17 so as to be coaxial with the concrete pile 20 buried in the ground to be removed, the driving device 14 is driven to rotate the auger screw 17 as shown in FIG. 4(b). The removal head 1 is brought into contact with the upper end of the concrete pile 20 by gradually lowering it while rotating it (step S2). Then, the removal head 1 is rotated via the auger screw 17 by the driving device 14, and the concrete pile 20 is continuously crushed while the auger screw 17 is gradually lowered (step S3). The crushed material of the concrete pile 20 generated in the process of crushing the concrete pile 20 is gradually guided upward as the spiral blade 3 of the removal head 1 rotates, and finally discharged to the ground by the auger screw 17 ( step S4).

As the crushing operation progresses, as shown in FIG. 4(c), when the removing head 1 reaches the lower end (front end side) of the concrete pile 20, the crushing of the concrete pile 20 is completed. When the crushing of the concrete pile 20 is completed, the direction of rotation of the driving device 14 is reversed, the auger screw 17 is rotated in the direction opposite to that during crushing, and the wire rope 15 is operated as shown in FIG. 4(d). The auger screw 17 and the removal head 1 attached to its tip are pulled up above the ground level (GL) (step S5). Once the lift is complete, repeat the above steps as necessary for subsequent operations.

On the other hand, a pile hole solidifying material 22 (or "backfilling material") such as recycled sand is injected into the pile hole 21 created by removing the concrete pile 20 (step S6). When this work is performed until the pile hole solidifying material 22 reaches the same height as the ground level (GL), it becomes as shown in FIG. 5(b). As described above, the removal work and the backfilling work of the concrete pile 20 are completed.

[Another embodiment of the concrete pile removal method]
Next, another embodiment in which a part of the removal method in the above-described embodiment is modified will be described. The removal method in this embodiment is, after the processing shown in FIGS. , and this is performed until it reaches the ground level (GL) as shown in FIG. 7(b).

Furthermore, instead of the pile hole solidifying material 22 and the pile hole solidifying material 23 described above, it is also possible to drive a stress material such as a pile material or a core material into the pile hole 21 .

[Effects of Embodiment]
According to the removal head according to the present embodiment, the cylindrical casing 4 is arranged on the lower side of the spiral blade 3, and a plurality of first superstructures are arranged along the peripheral edge of the lower end side of the casing 4 along the circumferential direction. A hard bit (=peripheral crushing carbide bit) 5 is arranged, and second carbide bits (=center crushing carbide bit) are arranged in different directions in the diameter direction of the casing 4 inside the casing 4. ) 6, the concrete pile 20 can be reliably crushed, and the crushed material can be discharged continuously. Also, by arranging the second cemented carbide bit in a substantially S-shape, the contact with the concrete pile is improved, and it becomes possible to crush the concrete pile efficiently.

Also, since the first cemented carbide bit (=peripheral crushing cemented carbide bit) 5 and the second cemented carbide bit 6 are formed to be replaceable, there is an effect that they can be quickly replaced when they wear out. be. Depending on the degree of wear, either one of the first cemented carbide bit 5 and the second cemented carbide bit 6 can be replaced, and the other can be fixed.

Further, by providing the spiral blade 3 on the upper part of the casing 4, there is an effect that the crushed material can be continuously discharged to the ground side by the rotation of the removing head 1. FIG.

According to the method for removing a concrete pile according to the present embodiment, the removal head 1 is attached to the tip of the auger screw 17, and the removal head is driven through the auger screw 17 by the driving device 14 arranged on the upper side of the auger screw 17. Since the concrete pile 20 buried in the ground is crushed from the upper end side by rotating the 1, it is possible to continuously perform crushing and discharge of the crushed material, and the concrete pile 20 can be efficiently crushed. There is an effect that it can be removed.

In addition, it is said that the pile hole 21 after crushing can be quickly backfilled by injecting the pile hole solidifying materials 22 and 23 and the backfilling material into the pile hole 21 after removing the crushed material. effective.

Furthermore, by driving a stress material such as a pile material and a core material into the pile hole 21 after removing the crushed materials, there is an effect that the pile material, the core material, etc. to be discarded can be reused.

The present invention is not limited to the above embodiments, and various modifications are possible without departing from or changing the technical concept of the present invention. For example, concrete piles were targeted, but hollow piles and the like are also applicable. Also, in the present embodiment, the second cemented carbide bits 6, 6 are arranged in a single row, but other arrangements such as a cross are also possible.

As described above, each preferred embodiment has been described, but the removal head 1 according to the present invention is not limited to crushing/removing concrete piles, but is also applicable to crushing/removing utility poles, structures, etc. It can also be used to remove concrete obstacles.

REFERENCE SIGNS LIST 1 removal head 2 shaft 3 helical blade 4 casing 5 first carbide bit (peripheral crushing carbide bit)
6 Second carbide bit (central crushing carbide bit)
7 Frame Member 10 Heavy Equipment 11 Crane 12 Car Body 13 Leader 14 Driving Device 15 Wire Rope 16 Anti-Stabilizer 17 Auger 20 Concrete Pile 21 Hole 22 Pile Hole Hardening Material 23 Pile Hole Hardening Material 30 Heavy Equipment

Claims (3)

A removal head used in a concrete pile removal device for crushing and removing concrete piles placed in the ground, wherein the removal head includes a cylindrical casing and a lower part of the casing that extends in a circumferential direction. A plurality of peripheral edge crushing carbide bits for crushing the peripheral edge of the concrete pile arranged along the For removing a concrete pile, provided with a center crushing carbide bit for crushing the center of the concrete pile, which is arranged with an inclination so that the tip directions of the respective carbide bits are all different. A method for removing a concrete pile using a head, comprising:
attaching the removal head to the tip of an elongated auger screw with helical vanes around its periphery;
A step of crushing from the upper end side of the concrete pile placed in the ground by rotating the auger screw and the removal head with a driving device arranged on the upper side of the auger screw;
A method for removing a concrete pile, comprising: In the method for removing a concrete pile according to claim 1 ,
A method for removing a concrete pile, comprising the step of injecting a backfilling material or a solidifying material into the pile hole after removing the crushed material to backfill the pile. In the method for removing a concrete pile according to claim 2 ,
A method for removing a concrete pile, comprising the step of driving a stress material into the pile hole after removing the crushed material.

Images