Hanging device of hollow prefabricated pile

Abstract

To provide a hanging device of hollow prefabricated piles that can be applied sequentially to a plurality of hollow prefabricated piles having different pile diameters.SOLUTION: A hanging device of hollow prefabricated piles includes a cylindrical body, at least two arms, and a guide member. The cylindrical body has an engaging portion that can engage with a protrusion provided on a pile head portion of the hollow prefabricated pile and protruding inward from an inner peripheral surface of the hollow prefabricated pile in a radial direction of the hollow prefabricated pile. The at least two arms are fixed to the cylindrical body at a distance from the engaging portion in an axial direction of the cylindrical body and protrude outward from the cylindrical body in a radial direction of the cylindrical body. The guide members are connected to the at least two arms, respectively, and extend from the arms toward the engaging portion in the axial direction of the cylindrical body. A distance between the cylindrical body and the guide member can be changed in the radial direction of the cylindrical body.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a suspension device for hollow precast piles. [Background technology]

[0002] Some foundation piles are constructed by a preboring method in which a pile hole is excavated using a pile driver, a solidifying material such as cement milk is injected into the pile hole, and a hollow prefabricated pile is then sunk. When sunk, a pliers or a pile rotation cap disclosed in Patent Document 1 is connected to the pile driver in order to suspend the hollow prefabricated pile from the pile driver. The pile rotation cap has a cylindrical body part and an outer cylindrical part that are integrally attached concentrically to the top plate, and is configured such that when suspending the hollow prefabricated pile, the pile head is inserted into the outer cylindrical part as a guide, and the engagement claws on the pile side are engaged with the engagement grooves of the cylindrical part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility model registration No. 3156454 Summary of the Invention [Problem to be solved by the invention]

[0004] In the pile rotation cap disclosed in Patent Document 1, the tubular body and the outer tubular body are integrally attached to the top plate, and the outer tubular body cannot be replaced. Therefore, when erecting multiple hollow prefabricated piles with different pile diameters at one site, it is necessary to prepare multiple pile rotation caps with different sizes of outer tubular body and replace the pile rotation cap attached to the pile driver every time the pile diameter changes. Therefore, when using the pile rotation cap disclosed in Patent Document 1, the erection work becomes complicated. It is also possible to prepare multiple pile drivers and attach a different rotation fixing cap to each pile driver, but in this case, multiple pile drivers are required even at a small site.

[0005] In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a suspension device for hollow precast piles that can be sequentially applied to a plurality of hollow precast piles having different pile diameters. [Means for solving the problem]

[0006] (1) A suspension device for a hollow prefabricated pile according to at least one embodiment of the present invention is A cylindrical body having an engaging portion that can engage with a protrusion provided on a pile head of a hollow prefabricated pile, the protrusion protruding inward from an inner peripheral surface of the hollow prefabricated pile in a radial direction of the hollow prefabricated pile; At least two arms fixed to the cylindrical body apart from the engagement portion in the axial direction of the cylindrical body and protruding outward from the cylindrical body in the radial direction of the cylindrical body; a guide member connected to each of the at least two arms and extending from the arm portion toward the engagement portion in the axial direction of the cylindrical body; Equipped with The distance between the cylindrical body and the guide member is changeable in the radial direction of the cylindrical body.

[0007] According to the above configuration (1), since the distance between the cylindrical body and the guide member can be changed, hollow prefabricated piles of different pile diameters can be hung in sequence.

[0008] (2) In some embodiments, in the above configuration (1), The cylindrical body is provided with an insertion hole into which the arm can be inserted, and the insertion length of the arm into the insertion hole is adjustable. According to the above configuration (2), the distance between the cylindrical body and the guide member can be easily changed by changing the insertion length of the arm into the insertion hole. Effect of the Invention

[0009] According to at least one embodiment of the present invention, a suspension device for hollow precast piles is provided that can be sequentially applied to a plurality of hollow precast piles having different pile diameters. [Brief description of the drawings]

[0010] [Figure 1]1 is a diagram for explaining the process of sinking a hollow precast pile using a pile driver equipped with a hanging device for a hollow precast pile according to one embodiment of the present invention. FIG. [Diagram 2] FIG. 13 is a diagram for explaining the state of a prefabricated pile sunk into a pile hole while being suspended from a suspension device. [Diagram 3] FIG. 3 is a view of FIG. 2 from a different angle. [Figure 4] FIG. 2 is a perspective view showing a schematic view of a suspension device and a portion of a prefabricated pile. [Diagram 5] 5 is a schematic perspective view of the suspension device of FIG. 4 with arms and guide members removed. FIG. [Figure 6] 1A to 1C are schematic three-view diagrams of an arm and a guide member, in which (a) is a top view, (b) is a front view, and (c) is a side view. [Figure 7] 1A and 1B are perspective views showing a part of an arm and a retaining device for the arm, in which (a) shows the arm and the retaining device separated, and (b) shows the retaining device attached to the arm. [Figure 8] This is a diagram to explain the positional relationship between the protrusion attached to the prefabricated pile, the engagement groove of the cylindrical body, and the arm in the circumferential direction of the prefabricated pile, where (a) shows the state when the protrusion enters (or disengages) in the vertical direction from the opening of the engagement groove, and (b) shows the state when the engagement groove and the protrusion are engaged in the vertical direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0012] FIG. 1 is a diagram for explaining the installation of a hollow precast pile (hereinafter also simply referred to as a precast pile) 3 using a pile driver 2 equipped with a hanging device for a hollow precast pile (hereinafter also simply referred to as a hanging device) 1 according to one embodiment of the present invention. As shown in Fig. 1, the pile driver 2 has a mast 5 and a motor 7 that is attached to the mast 5 so as to be movable up and down. The suspension device 1 is connected to the motor 7, and can move up and down by raising and lowering the motor 7, and can rotate by operating the motor 7. The prefabricated pile 3, suspended from the pile driver 2 via the suspension device 1, is sunk into a pile hole 11 filled with cement milk 9.

[0013] Fig. 2 is a diagram for explaining the state of the prefabricated pile 3 that is sunk into the pile hole 11 while being suspended from the suspension device 1. Fig. 3 is a diagram seen from a different direction from Fig. 2. As shown in Figs. 2 and 3, the prefabricated pile 3 is sunk to a predetermined depth in the pile hole 11 by the pile driver 2. Then, in a state where the vertical position of the prefabricated pile 3 is adjusted by the pile driver 2, the hanging material 13 attached to the prefabricated pile 3 is held by the holding device 15 installed on the ground to support the prefabricated pile 3. The hanging material 13 is, for example, rod-shaped and is made of a gebin bar, a steel bar, a PC steel bar, or the like. The holding device 15 has, for example, a through hole for inserting the hanging material 13, and can hold the hanging material 13 by inserting the hanging material 13 into the through hole and then attaching a nut or the like to the upper part of the hanging material 13 as a retainer. Then, after supporting the prefabricated pile 3 with the holding device 15, the hanging device 1 is rotated to release the engagement between the hanging device 1 and the prefabricated pile 3, and only the hanging device 1 is lifted up. Therefore, the pile driver 2 can move to the next work without waiting for the cement milk 9 to solidify. In addition, in FIG. 3, the hanging material 13 and the gripping device 15 are omitted.

[0014] 4 is a perspective view that shows a schematic view of the suspension device 1 and a part of the precast pile 3. As shown in FIG. 4, the precast pile 3 suspended from the pile driver 2 via the suspension device 1 is provided with a protrusion 17 that protrudes inward from the inner peripheral surface of the precast pile 3 in the radial direction of the precast pile 3. For example, the protrusion 17 has a rectangular column shape that is longer than the inner diameter of the precast pile 3, and is disposed so as to straddle the hollow part of the precast pile 3. The protrusion 17 is fixed to the upper end surface or inner peripheral surface of the precast pile 3 by bolts, welding, or the like, but a part of the protrusion 17 may be embedded in the concrete part of the precast pile 3.

[0015] 4, the suspension device 1 is made of, for example, metal, and includes a tube 20, at least two arms 22, and a guide member 24. The tube 20 has a cylindrical shape with both ends open, and has an outer diameter smaller than the inner diameter of the prefabricated pile 3. A connecting member 26 for connecting the pile driver 2 and the tube 20 is fixed, for example, by welding, to one end side (upper end side) of the tube 20 in the axial direction.

[0016] The connecting member 26 is composed of, for example, a base portion 28, a plurality of ribs 30, and a male part 32 of a countersunk joint. The base portion 28 has a disk shape with a smaller diameter than the cylindrical body 20, and the base portion 28 and the cylindrical body 20 are arranged coaxially with a distance from each other. A plurality of ribs 30 are arranged between the base portion 28 and the cylindrical body 20, and each of the plurality of ribs 30 is composed of, for example, a trapezoidal plate. The plurality of ribs 30 are arranged radially around the axis of the base portion 28 and the cylindrical body 20, and the long side of each rib 30 is welded to the cylindrical body 20, and the short side of each rib 30 is welded to the base portion 28. The male part 32 has, for example, a rectangular column shape, is configured coaxially and integrally with the base portion 28, and protrudes from the base portion 28 toward the opposite side to the cylindrical body 20. The male part 32 can be fitted and fixed to a female part on the pile driver 2 side. According to the connecting member 26, the cylindrical body 20 and the base portion 28 are arranged apart from each other, and the plurality of ribs 30 are arranged radially, so that there are gaps between the ribs 30 that communicate with the inside of the cylindrical body 20. When the precast pile 3 is driven into the cylindrical body 20, the cement milk 9 flows into the cylindrical body 20 and is discharged from the gaps between the ribs 30.

[0017] The other end (lower end) of the cylindrical body 20 is provided with an engagement groove 34 having a substantially L-shape in side view as an engagement portion that can engage with the protrusion 17 on the prefabricated pile 3 side. The engagement groove 34 has an axial portion 34a extending in the axial direction of the cylindrical body 20, and a circumferential portion 34b that is connected to one end (inner end) of the axial portion 34a and extends in the circumferential direction of the cylindrical body 20. The other end (outer end) of the axial portion 34a of the engagement groove 34 opens at the other end of the cylindrical body 20, and the cylindrical body 20, which are coaxial with each other, is brought closer to the prefabricated pile 3 in the axial direction (up and down direction) to insert the protrusion 17 from the opening of the axial portion 34a of the engagement groove 34, and then the cylindrical body 20 is rotated to move the protrusion 17 laterally within the circumferential portion 34b of the engagement groove 34, whereby the circumferential portion 34b of the engagement groove 34 and the protrusion 17 can be engaged in the up and down direction. To release the engagement between the projection 17 and the engagement groove 34, the cylindrical body 20 may be rotated and then pulled up.

[0018] At least two arms 22 each have, for example, a plate shape or a rectangular parallelepiped shape, and are fixed to the cylindrical body 20 at a distance from the engagement groove 34 in the axial direction of the cylindrical body 20. Each arm 22 protrudes outward from the cylindrical body 20 in the radial direction of the cylindrical body 20. In this embodiment, the two arms 22 are arranged in the radial direction of the cylindrical body 20, 180 degrees apart in the circumferential direction of the cylindrical body 20. When there are three or more arms 22, the arms 22 are arranged at appropriate intervals in the circumferential direction of the cylindrical body 20 so as not to interfere with the hanging material 13.

[0019] The guide members 24 are provided in a number corresponding to the number of arms 22, and are connected to each arm 22. The guide members 24 extend downward from the arms 22 (towards the engagement grooves 34) in the axial direction of the cylindrical body 20. In this embodiment, the guide members 24 have a plate shape (divided cylindrical shape) curved in an arc shape so as to fit along the outer periphery of the head of the precast pile 3. The guide members 24 only partially cover the outer periphery of the head of the precast pile 3 in the circumferential direction of the precast pile 3, and do not cover the entire outer periphery of the head.

[0020] The guide member 24 is spaced a predetermined distance from the cylindrical body 20 in the radial direction of the cylindrical body 20 via the arm 22, but the distance between the cylindrical body 20 and the guide member 24 can be changed at the pile driving site, and can be changed even when the suspension device 1 is still attached to the pile driver 2, as long as the prefabricated pile 3 is not suspended.

[0021] When a prefabricated pile 3 is suspended from the suspension device 1 of the above embodiment, the head of the prefabricated pile 3 is suspended by a wire toward the suspension device 1, which is attached to the pile driver 2 and located at a predetermined height. As the head of the pile gradually approaches the suspension device 1, the guide member 24 guides the head of the pile to be coaxial with the cylindrical body 20. Then, the suspension device 1 is rotated as necessary to align the protrusion 17 with the opening of the axial portion 34a of the engagement groove 34, and the head of the pile is further suspended, so that the protrusion 17 enters the axial portion 34a of the engagement groove 34 by a predetermined length. Then, the suspension device 1 is rotated to cause the protrusion 17 to enter the circumferential portion 34b of the engagement groove 34, and the suspension device 1 and the prefabricated pile 3 are engaged in the vertical direction. Conversely, when the suspension device 1 is to be removed from the prefabricated pile 3 sunk in the pile hole 11, the suspension device 1 is rotated and then pulled up.

[0022] According to the above embodiment, since the distance between the cylindrical body 20 and the guide member 24 can be changed, the same suspension device 1 can be used to successively suspend hollow prefabricated piles 3 having different pile diameters. Furthermore, according to the above embodiment, since the guide member 24 only partially covers the outer periphery of the pile head of the prefabricated pile 3, when the prefabricated pile 3 is suspended from the suspension device 1, the opening of the axial portion 34a of the engagement groove 34 of the cylindrical body 20 can be easily aligned with the protrusion 17 on the prefabricated pile 3 side. Furthermore, according to the above embodiment, since the guide member 24 only partially covers the outer periphery of the pile head of the precast pile 3, it is possible to avoid interference between the hanging material 13 and the guide member 24, and it is also possible to avoid interference between the gripping device 15 and the guide member 24. As a result, the hanging material 13 attached to the precast pile 3 can be easily gripped by the gripping device 15 on the ground, and then the hanging device 1 can be easily detached from the precast pile 3. In addition, the guide member 24 can also function as a vibration prevention device for the prefabricated pile 3 that is suspended.

[0023] FIG. 5 is a schematic perspective view of the suspension device 1 of FIG. 4 with the arm 22 and the guide member 24 removed. In some embodiments, in order to change the distance between the cylindrical body 20 and the guide member 24, as shown in Fig. 5, the cylindrical body 20 is provided with an insertion hole 36 for inserting the arm 22 in the radial direction of the cylindrical body 20. The opening shape of the insertion hole 36 corresponds to the cross-sectional shape of the arm 22. By changing the insertion length of the arm 22 into the insertion hole 36 of the cylindrical body 20, the distance between the cylindrical body 20 and the guide member 24 can be easily changed. According to the above embodiment, by changing the insertion length of the arm 22 into the insertion hole 36 of the cylindrical body 20, the distance between the cylindrical body 20 and the guide member 24 can be easily changed.

[0024] To make the insertion length of the arm 22 into the insertion hole 36 of the cylindrical body 20 changeable, a fixing means for the arm 22 is required. In this embodiment, as the fixing means, a bracket 38 is fixed to the outer circumferential surface of the cylindrical body 20 so as to be continuous with the opening edge of the insertion hole 36. For example, the bracket 38 has a U-shaped cross-sectional shape corresponding to the cross-sectional shape of the arm 22, and extends a predetermined length in the radial direction of the cylindrical body 20 within a range that does not interfere with the guide member 24. The bracket 38 is provided with a bolt hole 40 for fixing the arm 22.

[0025] 6 is a schematic three-view diagram of the arm 22 and the guide member 24. As a means for fixing the arm 22, the arm 22 is provided with a bolt hole 42 that can communicate with the bolt hole 40 of the bracket 38. The bracket 38 and the arm 22 can be fastened together by connecting the bolt holes 40, 42 of the bracket 38 and the arm 22 to each other, passing a bolt through the bolt, and screwing a nut into the tip of the bolt. By providing a plurality of bolt holes 42 at different positions in the longitudinal direction of the arm 22, the bolt hole 42 used for fastening can be changed to change the distance between the cylindrical body 20 and the guide member 24. The method of fixing the arm 22 and the bracket 38 is not limited to bolts and nuts, but may be achieved by providing pin holes in the arm 22 and the bracket 38 and inserting pins into the pin holes.

[0026] When inserting the arm 22 into the insertion hole 36 of the cylindrical body 20, it is preferable to provide a means for preventing the arm 22 from coming off. FIG. 7 is an oblique view showing a part of arm 22 and a schematic representation of anti-slip device 44 for arm 22, where (a) shows arm 22 and anti-slip device 44 separated, and (b) shows anti-slip device 44 attached to arm 22. More specifically, a fitting groove 46 for the stopper 44 is provided on the inner end side of the arm 22 in the radial direction of the cylindrical body 20, and the stopper 44 is fitted into the fitting groove 46. The stopper 44 is configured to protrude in the vertical or horizontal direction from the arm 22 when fitted into the fitting groove 46. The stopper 44 fitted into the fitting groove 46 abuts against the inner wall of the cylindrical body 20, thereby preventing the arm 22 from falling off from the cylindrical body 20.

[0027] According to the above-mentioned configuration, by fitting the retaining member 44 into the fitting groove 46, a means for preventing the arm 22 from falling off can be formed with a simple configuration. Furthermore, if the connecting member 26 is configured with the radially arranged ribs 30 as described above, the stopper 44 can be easily attached to the arm 22 through the gaps between the ribs 30. It should be noted that the anti-slip device 44 shown in FIG. 7 is U-shaped and has fitting grooves 46 formed on both side walls of the arm 22, but the anti-slip device may be pin-shaped, in which case it is sufficient to provide a pin hole in the arm 22.

[0028] Figure 8 is a diagram for explaining the positional relationship between the protrusion 17 attached to the precast pile 3, the engagement groove 34 of the cylindrical body 20, and the arm 22 in the circumferential direction of the precast pile 3, where (a) shows the state when the protrusion 17 enters (or leaves) the opening of the engagement groove 34 in the vertical direction, and (b) shows the state when the engagement groove 34 and the protrusion 17 are engaged in the vertical direction.

[0029] In order to easily confirm the position of the opening of the engagement groove 34 and the position of the protrusion 17 of the prefabricated pile 3 when hanging the prefabricated pile 3 from the hanging device 1, it is preferable to configure the guide member 24 so that the opening of the engagement groove 34 is not covered, as shown in FIG. 8(a). Therefore, it is preferable that the position of the opening of the engagement groove 34 and the mounting position of the arm 22 to the cylinder 20 are different in the circumferential direction of the cylinder 20. On the other hand, when the hanging material 13 and the protrusion 17 are arranged at a 90 degree distance in the circumferential direction of the cylinder 20, if the position of the opening of the engagement groove 34 and the mounting position of the arm 22 to the cylinder 20 are too far apart in the circumferential direction of the cylinder 20, there is a risk that the arm 22 and the hanging material 13 will interfere with each other. Therefore, it is preferable to determine the mounting position of the arm 22 to the cylinder 20 in the circumferential direction of the cylinder 20 so that the guide member 24 covers the protrusion 17 when the engagement groove 34 and the protrusion 17 are engaged in the vertical direction, as shown in FIG. 8(b). In other words, the attachment position of the arm 22 to the cylinder body 20 is preferably located above the horizontal portion of the engagement groove 34 .

[0030] Finally, the present invention is not limited to the above-described embodiment, but includes modifications to the above-described embodiment and appropriate combinations of these modifications. For example, in the above-described embodiment, the protrusion 17 attached to the prefabricated pile 3 straddles the hollow portion of the prefabricated pile 3, and both ends of the protrusion 17 are fixedly attached to the prefabricated pile 3, but a short protrusion may be attached in a cantilevered state to the prefabricated pile 3. Also, in the above-described embodiment, the protrusion 17 engages with two engagement grooves 34 provided in the cylindrical body 20, but three or more engagement grooves 34 may be provided in the cylindrical body 20, and the number of protrusions 17 may be increased to correspond to each engagement groove 34.

[0031] Furthermore, in the above-described embodiment, the guide member 24 has a curved plate shape, but as long as the head of the prefabricated pile 3 can be guided (centered) when the prefabricated pile 3 is suspended from the suspension device 1, the shape of the guide member 24 is not particularly limited, and the guide member 24 may have a plate shape with a V-shaped or "L"-shaped cross section. If there are three or more guide members 24, the length (width) of the guide members 24 in the circumferential direction of the cylindrical body 20 may be short, the guide members 24 may be rod-shaped, or the arms 22 and the guide members 24 may be composed of an L-shaped plate as a whole. Furthermore, the multiple guide members 24 may have different shapes from each other.

[0032] Furthermore, in the above-described embodiment, an insertion hole 36 for inserting the arm 22 into the cylindrical body 20 was provided in the cylindrical body 20 in order to change the distance between the cylindrical body 20 and the guide member 24, but an insertion hole for inserting the arm 22 may be provided in the guide member 24 to make it possible to change the distance between the cylindrical body 20 and the guide member 24.

[0033] Furthermore, in the above-described embodiment, the lower end side of the guide member 24 was arranged to surround the outer periphery of the pile head of the precast pile 3, but the lower end side of the guide member 24 may be configured to be inserted between the inner surface of the precast pile 3 and the cylindrical body 20. [Explanation of symbols]

[0034] 1. Hollow precast pile suspension device 2 Pile driver 3 Prefabricated piles 5 Mast 7 Motor 9. Cement Milk 11 Pile hole 13 Hanging material 15 Gripping device 17 Protrusion 20 cylinder 22 Arms 24 Guide member 26 Connecting members 28 Pedestal 30 Ribs 32 Male part of the spigot joint 34 Engagement groove 34a Axial section 34b Circumferential section 36 Insertion hole 38 Bracket 40 Bracket bolt holes 42 Arm bolt hole 44 Stopper 46 Fitting groove for retaining device

Claims

1. In a hanging device for hollow prefabricated piles, A cylindrical body having an engaging portion that can engage with a protrusion provided on a pile head of the hollow prefabricated pile and protruding inward from an inner peripheral surface of the hollow prefabricated pile in a radial direction of the hollow prefabricated pile; At least two arms fixed to the cylindrical body apart from the engagement portion in the axial direction of the cylindrical body and protruding outward from the cylindrical body in the radial direction of the cylindrical body; a guide member connected to each of the at least two arms and extending from the arm portion toward the engagement portion in the axial direction of the cylindrical body; Equipped with The distance between the cylindrical body and the guide member is changeable in the radial direction of the cylindrical body. A device for suspending hollow prefabricated piles, characterized by the above.

2. The cylindrical body is provided with an insertion hole into which the arm can be inserted, and the insertion length of the arm into the insertion hole can be changed.

2. The device for suspending hollow precast piles according to claim 1 .

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