JP5046037B2 - Equipment for removing hollow concrete pile joints - Google Patents

Description

  This invention relates to the apparatus which removes a joint part, when already crushing and removing the embedded hollow concrete pile.

When dismantling an existing building and constructing a new building at that location, if the hollow concrete piles that were driven into the ground would obstruct the construction, it was necessary to remove it. In addition, when hollow concrete piles were buried by the rotary burying method, it was necessary to remove them when construction defects such as torsional fracture occurred in the hollow concrete piles. In such a case, various apparatuses and methods have been conventionally proposed (Patent Documents 2 and 3). The applicant has proposed a removal method and a removal device with a wide application range that can be miniaturized and do not depend on the pile diameter or thickness of the hollow concrete pile (Patent Document 1).
JP 2000-328569 A Japanese Patent No. 2863487 JP-A-9-203039

  In the conventional technique, the crushing blade is projected at an angle close to 90 degrees with respect to the lower arm, and the crushing blade is burdened. In order to withstand this, the lower arm structure and the crushing blade structure / material There was a problem that the selection was restricted.

  However, the present invention forms a crushing blade in the extending direction of the tip of the lower arm of the crushing arm, and only the end plate abutting portion of the upper arm abuts the upper surface of the upper end plate of the hollow concrete pile, The above-mentioned problem was solved because it was configured so as not to come into contact with.

That is, this invention is the removal apparatus of the joint part of the hollow concrete pile characterized by having been comprised as follows.
(1) A horizontal axis is provided radially on the outer surface of the apparatus body that can be inserted into the hollow portion of the hollow concrete pile.
(2) Attach the crushing arm center of the crushing arm to the horizontal axis of the main body of the device.
(3) The crush arm is formed by connecting the lower arm and the upper arm at a predetermined angle to the center of the crush arm.
(4) A crushing blade is formed at the tip of the lower arm of the crushing arm in the extending direction of the tip of the lower arm.
(5) An end plate abutting portion is formed at the tip of the upper arm, and the crushing blade is in contact with an inner wall of a hollow concrete pile to be crushed, The crushing arm is formed so that it abuts the upper surface of the upper end plate of the pile and “the upper arm does not abut the inner periphery of the upper end plate”.

  Moreover, in the above, the crushing blade is an apparatus for removing a joint portion of a hollow concrete pile, wherein the crushing blade is formed so as to be in contact with the inner wall of the hollow concrete pile obliquely downward. In addition, when the crushing blade crushes the hollow concrete pile to be crushed and reaches the outer peripheral wall side of the hollow concrete pile, the end plate contact portion touches the upper surface of the upper end plate of the hollow concrete pile to be crushed. It is the removal apparatus of the joint part of the hollow concrete pile characterized by forming the crushing arm so that it may touch or be located above.

Moreover, in the above, it is the removal apparatus of the joint part of the hollow concrete pile formed as follows.
(1) The upper arm includes an upper arm base portion connected to the crushing arm center portion and an upper arm tip portion having an end plate abutting portion, and the upper arm tip portion approaches the lower arm with respect to the upper arm base portion. Refracted and formed.
(2) The lower arm consists of a lower arm base connected to the crushing arm center and a lower arm tip having a crushing blade, and the lower arm tip approaches the upper arm with respect to the lower arm base. In this way, it was refracted.

  Moreover, in the above, after the crushing blade reaches the outer peripheral wall of the hollow concrete pile, it is a removal device for the joint portion of the hollow concrete pile provided with the lock mechanism that holds the rotation of the crushing arm.

  Since the crushing arm formed by connecting the lower arm and the upper arm having crushing blades at a predetermined angle is swingably mounted, the apparatus is configured. Therefore, an existing pile of a super-large-diameter pile (pile diameter of about 1200 mm) or a thick wall ( Even if it is an existing pile, even if it does not use a large-scale apparatus, there exists an effect which can form an annular groove and can cut easily and can remove a joint part. Moreover, there exists an effect which can respond to a wide pile diameter (for example, about 300-1200 mm).

  Further, since the crushing blade is formed at the tip of the lower arm of the crushing arm in the extending direction of the tip of the lower arm, the burden on the crushing blade during crushing can be reduced. In addition, in a state where the crushing blade is in contact with the inner wall of the hollow concrete pile to be crushed, “the end plate abutting portion is in contact with the upper surface of the upper end plate of the hollow concrete pile to be crushed” and “the upper arm is inside the upper end plate. Since the crushing arm is formed so as not to contact the circumference, the pushing force is transmitted to the crushing blade with the upper surface of the end plate as a fulcrum, and efficient crushing can be performed. Further, if the crushing blade is configured to contact the inner wall of the hollow concrete pile obliquely downward, the folding force is further transmitted to the crushing blade, and efficient crushing can be performed.

  In addition, when the crushing blade crushes the hollow concrete pile scheduled to crush and reaches the outer wall side of the hollow concrete pile, “the end plate contact part abuts the upper surface of the upper end plate of the hollow concrete pile scheduled to crush or If the crushing arm is formed so as to be positioned above, crushing is completed and the separated joint portion can be securely held and transported to a predetermined position.

Further, the upper arm includes an upper arm base portion connected to the crushing arm center portion and an upper arm tip portion having an end plate contact portion, and the upper arm tip portion approaches the lower arm with respect to the upper arm base portion. Formed by refraction,
The lower arm comprises a lower arm base connected to the crushing arm center and a lower arm tip having a crushing blade, and the lower arm tip is refracted so as to approach the upper arm with respect to the lower arm base. In this case, the excavation efficiency can be improved, and the joint portion after crushing can be safely removed and transported.

The joint removing device 20 of the present invention is configured as follows (FIG. 1).
Horizontal shafts 3 and 3 are provided radially on the outer surface of the apparatus main body 1 that can be inserted into the hollow portion 24 of the hollow concrete pile 23 to be applied. A crushing arm 5 is swingably attached to both horizontal shafts 3 and 3 of the apparatus main body 1. The crushing arm 5 is formed in a “<” shape in which the lower arm 6 and the upper arm 12 are connected to the crushing arm central portion 10 at a predetermined angle, and the central shaft 3 is attached to the crushing arm central portion 10. A crushing blade 11 is formed to project from the tip of the lower arm 6 of the crushing arm 5 in the extending direction of the lower arm tip 8 of the lower arm 6.
An end plate contact portion 16 is formed at the tip of the upper arm 12. Further, in a state where the crushing blade 11 is in contact with the inner wall 25 of the hollow concrete pile 23 to be crushed, “the end plate abutting portion 16 is in contact with the upper surface of the upper end plate 27 of the hollow concrete pile 23 to be crushed” and “ The crushing arm 5 is formed so that the upper arm 12 does not contact the inner periphery 27b of the upper end plate 27 ".

  Embodiments of the present invention will be described with reference to the drawings.

[1] Device configuration

(1) A connecting portion 2 for connecting to the auger shaft 22 is formed at the upper end of the apparatus main body 1 having a size that can be inserted into the hollow portion 24 of the existing concrete pile 23 to be destroyed. Horizontal shafts 3 and 3 are provided at symmetrical positions in the horizontal direction, and the crushing arm central portion 10 of the crushing arm 5 having crushing blades 11 at the lower ends of the horizontal shafts 3 and 3 is pivotally supported.

(2) The crushing arm 5 is provided with a lower arm 6 having a crushing blade 11 at the lower end thereof continuously connected to the lower side of the crushing arm central part 10, and the crushing arm central part 10 in the lateral direction (the auger shaft 22, the apparatus main body 1. On the other hand, the upper arms 12 are arranged in a radial manner. Accordingly, the entire crushing arm 5 is bent in a substantially “<” shape when viewed from the front (in the horizontal axis direction). The angle formed by the upper arm 12 and the lower arm 6 of the crushing arm 5 is usually formed at about 90 degrees, and the crushing arm 5 has a surface of the upper arm 12 and a surface of the lower arm 6 narrower than 180 degrees on the inner surface 15. The inner surface 9.

(3) Further, the lower arm 6 has a portion connected to the crushing arm central portion 10 as a lower arm proximal end portion 7, a portion provided with the crushing blade 11 as a lower arm distal end portion 8, and the lower arm distal end portion 8 The lower arm base end portion 7 is refracted toward the upper arm 12 and is formed with an angle. The crushing blade 11 is disposed on an extension line in the length direction of the lower arm tip 8 (direction toward the tip).

(4) The upper arm 12 has a portion connected to the crush arm central portion 10 as an upper arm base end portion 13 and the other portion as an upper arm distal end portion 14. The tip of the inner surface 15 of the upper arm tip 14 is referred to as an end plate contact portion 16. On the inner surface 15 of the upper arm 12, a portion of the refracted portion between the upper arm proximal end portion 13 and the upper arm distal end portion 14 that has an angle smaller than 180 degrees is defined as a gap portion 17.

  Further, the crushing arm 5 is formed such that the lower arm 6 has a larger volume (longer length and / or wider) than the upper arm 12 so that the lower arm 6 hangs downward due to its own weight. Yes.

(5) In addition, the crushing arm 5 enters the hollow portion 24 of the ready-made concrete pile 23 to be crushed by the lower arm 6, and the tip of the crushing blade 11 of the lower arm 6 is in contact with the inner peripheral wall 25. The end plate abutting portion 16 of the upper arm 12 abuts on the central portion 27a on the upper surface of the end plate 27 of the ready-made concrete pile 23 (does not abut near the inner periphery 27b or the outer periphery 27c of the end plate 27). At this time, the gap portion 17 of the upper arm 12 is positioned above the inner periphery 27 b of the end plate 27, and the upper arm 12 has portions other than the end plate abutting portion 16 of the end plate 27 and the ready-made concrete pile 23. It is formed so as not to come into contact with other parts.

  As described above, the crushing and removing apparatus 20 is configured (FIG. 1).

[2] Crushing operation using device 20

  Next, the use of the crushing and removing apparatus 20 of the present invention will be described based on the above embodiment.

(1) The ready-made concrete pile 23 to be crushed removes soil, solidified cement milk, and the like of the outer peripheral wall 26 of the hollow portion 24 of the ready-made concrete pile 23 to a position where the crushed and joint portion 28 can be removed. Further, the end plate 27 is positioned on the upper surface (FIG. 2A). Further, the crushing arm 5 and the crushing blade 11 may be damaged by frictional heat during crushing. It is desirable to provide cooling means such as preliminarily storing water or the like up to the crushing position.

(2) The connecting portion 2 of the crushing and removing apparatus 20 is connected to the lower end portion of the auger shaft 22. The crushing / removing device 20 (auger shaft 22) is slowly lowered from above the ready-made concrete pile 23, and the crushing / removing device 20 is inserted into the hollow portion 24 of the ready-made concrete pile 23 (FIG. 2A). In this state, the crushing arm 5 is in its own weight and the lower arm 6 is hung downward.

(3) In a state where the end plate contact portion 16 of the upper arm 12 of the crushing and removing device 20 that has been lowered is in contact with the center portion on the upper surface of the end plate 27 of the ready-made concrete pile 23 (fulcrum) (FIG. 2A, FIG. 1 (b)), when the crushing / removing device 20 is further pushed downward, the crushing blade 11 of the lower arm 6 is the inner peripheral wall 25 of the ready-made concrete pile 23 and abuts below the joint hardware 27 (action point) ( FIG. 3 (a)). At this time, since the inner surface 15 of the upper arm 12 of the crushing and removing apparatus 20 is inclined downward in the radial direction, the portions other than the end plate contact portion 16 do not touch the ready-made concrete pile 23.

  At this time, the crushing blade 11 abuts the inner peripheral wall 25 of the ready-made concrete pile 23 downward from the horizontal, so that the movement of the power point for lowering the crushing and removing device 20 is transmitted to the crushing blade 11 and the ready-made concrete is obtained. It is easy to cut the inner peripheral wall 25 of the pile 23.

(4) Subsequently, the auger shaft 22 is rotated, the crushing / removing device 20 is rotated and pressed downward (power point), and the ready-made concrete pile 23 is attached to the inner peripheral wall 25 by the crushing blades 11 of the crushing arms 5 and 5 on both sides. Then, the annular groove 30 is crushed while spreading outward (FIG. 2 (c)). At this time, in the state where the end plate contact portion 16 of the upper arm 12 of the upper arm 12 is in contact with the upper surface of the end plate 27 of the ready-made concrete pile 23, the upper arm 12 serves as a guide and the upper edge of the inner peripheral wall 25 of the ready-made concrete pile 23. 25a Since the crushing blade 11 rotates at substantially the same height, an annular groove 30 can be formed. In addition, the crushing blades 11 and 17 and the upper arms 12 and 12 that serve as guides are set at two positions that are symmetrical with respect to the diameter by the two crushing arms 5 and 5, so that cutting (formation of the annular groove 30) is performed. Increase accuracy and efficiency. At this time, the crushing time can be shortened by adjusting the pressing and / or rotational load of the auger shaft 22.

(5) Further, when the crushing and removing device 20 is rotated and pushed in, the crushing blades 11 and 11 cut steel bars and rebars such as PC steel bars inside the ready-made concrete piles 23, and the annular groove 30 is formed. The ready-made concrete pile 23 penetrates to the outer peripheral wall 26 side, and the crushing blade 11 also penetrates to the outer peripheral wall 26 side of the ready-made concrete pile 23 (FIGS. 3B and 2D). Even in this state, since the inner surface 15 of the upper arm 12 of the crushing and removing apparatus 20 is inclined downward in the radial direction or is in a horizontal state, a portion other than the end plate contact portion 16 is the ready-made concrete pile 23. Or the inner surface 15 contacts only the upper surface of the end plate 27 of the ready-made concrete pile 23.

(6) In this state, once the rotation of the auger shaft 22 is stopped and the auger shaft 22 is pulled down, the upper and lower surfaces of the joint portion (columnar shape) 28 separated and cut from the ready-made concrete pile 23 are It is sandwiched between the end plate abutting portion 16 and the lower arm tip portion 8 (including the crushing blade 11) of the lower arm 6 and lifted upward without dropping (FIG. 3B).

(7) The joint portion 28 can be separated from the ready-made concrete pile 23 as described above. By repeating the above operation, the ready-made concrete pile 23 is destroyed (FIG. 4).

[3] Other embodiments

(1) In the above embodiment, the upper arm 12 has a shape in which the upper arm proximal end portion 13 and the upper arm distal end portion 14 are refracted, and the inner surface 15 is also refracted, and the void portion 17 is formed in the bent portion. The inner surface 15 may be flat and a recess may be formed in the vicinity of the gap 17 (not shown). In this case, the end plate abutting portion 16 can also be configured by forming a protrusion on the inner surface 15 (not shown).

(2) Moreover, in the said Example, since the lower arm 6 refracted and comprised the lower arm base end part 7 and the lower arm front-end | tip part 6, when pulling up the joint part 28 isolate | separated after crushing, a joint part Although it is easy to grab 28, it is optional (not shown).

(3) Moreover, in the said Example, in the state which the crushing blade 8 reached the outer peripheral wall 26 of the ready-made concrete pile 23, and isolate | separated the joint part 28 (FIG.3 (b), rocking | fluctuation of the crushing arm 5 of the state It is also possible to provide a lock mechanism for stopping

  For example, the hole for attaching the horizontal shaft 3 to the crushing arm 5 is formed in a flat “backward” shape that is a long hole 32 that is long in the horizontal direction and is convex downward. In this case, before the crushing blade 8 reaches the outer peripheral wall 26 of the ready-made concrete pile 23 (FIGS. 2A, 2 </ b> B, and 2 </ b> C), the horizontal shaft 3 has a long hole 32 due to its own weight. Is located at the end of one side 33 (opposite side of the arms 6 and 12) (the long holes 32a and 32b in FIGS. 5A, 5B, and 5D). Further, if the crushing blade 8 reaches the outer peripheral wall 26 of the ready-made concrete pile 23 (FIGS. 3B and 2D), the crushing arm 5 is caused by its own weight at the subsequent rotation position. 10 moves in parallel, and the end of the other side 34 (arms 6 and 12) of the long hole 32 moves to the horizontal shaft 3 side (the long hole 32c in FIGS. 5C and 5E). In this state, a stopper 35 for stopping the crushing arm 10 is provided in the apparatus main body 1. Thereby, the crushing arm 10 maintains its position, and the separated joint portion can be safely transported to a predetermined position.

In an embodiment of the present invention, (a) is a plan view, (b) is a front view, and (c) is a side view. The use of the device of the present invention is shown, (a) before crushing, (b) the state where the upper arm is in contact with the end plate, (c) during crushing, and (d) after crushing completion. It is a front view of the apparatus of this invention, (a) represents the state where the crushing blade is located on the inner peripheral wall of the ready-made concrete pile, and (b) represents the state where the crushing blade is located on the inner peripheral wall of the ready-made concrete pile. It is the schematic front view of a ready-made concrete pile. It is a figure explaining the locking mechanism of this invention, (a)-(c) is the schematic front view, (d) (e) is an enlarged front view of a long hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Connection part 3 Horizontal axis 5 Crush arm 6 Lower arm 7 Upper arm base end part 8 Upper arm tip part 9 Lower arm inner surface 10 Excavation arm center part 11 Crushing blade 12 Upper arm 13 Upper arm base end part 14 Upper arm front end part 15 Upper arm Inner surface 17 Upper arm gap portion 20 Joint portion crushing and removing device 22 Auger shaft 23 Ready-made concrete pile 24 Hollow portion of ready-made concrete pile 25 Inner peripheral wall of ready-made concrete pile 26 Outer peripheral wall 27 of ready-made concrete pile End plate 27a End plate 27b End Inner perimeter of plate 27c Outer perimeter of end plate 28 Precast concrete pile joint 30 Annular grooves 32, 32a, 32b, 32c Long hole 33 One end of long hole 34 Other end 35 of long hole Stopper

Claims (5)

An apparatus for removing a joint portion of a hollow concrete pile, characterized by being configured as follows.
(1) A horizontal axis is provided radially on the outer surface of the apparatus body that can be inserted into the hollow portion of the hollow concrete pile.
(2) Attach the crushing arm center of the crushing arm to the horizontal axis of the main body of the device.
(3) The crush arm is formed by connecting the lower arm and the upper arm at a predetermined angle to the center of the crush arm.
(4) A crushing blade is formed at the tip of the lower arm of the crushing arm in the extending direction of the tip of the lower arm.
(5) forming an end plate contact portion at the tip of the upper arm,
In a state in which the crushing blade is in contact with the inner wall of the hollow concrete pile to be crushed, "the end plate abutting portion is in contact with the upper surface of the upper end plate of the hollow concrete pile to be crushed" and "the upper arm is the upper plate The crushing arm is formed so that it does not abut against the inner circumference. 2. The apparatus for removing a joint portion of a hollow concrete pile according to claim 1, wherein the crushing blade is formed so as to abut on the inner wall of the hollow concrete pile obliquely downward. In a state where the crushing blade crushes the hollow concrete pile scheduled to crush and reaches the outer peripheral wall side of the hollow concrete pile, “the end plate contact portion abuts the upper surface of the upper end plate of the hollow concrete pile scheduled to crush or The apparatus for removing a joint portion of a hollow concrete pile according to claim 1, wherein a crushing arm is formed so as to be positioned above. It formed as follows, The removal apparatus of the joint part of the hollow concrete pile of Claim 1 characterized by the above-mentioned.
(1) The upper arm includes an upper arm base portion connected to the crushing arm center portion and an upper arm tip portion having an end plate abutting portion, and the upper arm tip portion approaches the lower arm with respect to the upper arm base portion. Refracted and formed.
(2) The lower arm consists of a lower arm base connected to the crushing arm center and a lower arm tip having a crushing blade, and the lower arm tip approaches the upper arm with respect to the lower arm base. In this way, it was refracted. The removal apparatus of the joint part of a hollow concrete pile of Claim 1 which provided the lock mechanism which hold | maintains rotation of a crushing arm, after the crushing blade reached the outer peripheral wall of a hollow concrete pile.

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