JP6361201B2 - Pile holding device - Google Patents

Description

  The present invention provides a pile provided at a pile hole opening to hold a ready-made pile when a ready-made pile that can be used alone or connected to another pile at the upper end is built in a pile hole at a construction site. The present invention relates to a holding device.

  As foundation structures for buildings, etc., pile foundations made by burying prefabricated piles such as PHC piles, RC piles, PRC piles, steel piles, SC piles, and node piles in pile holes formed in the ground are often used. . The ready-made piles are usually limited to a maximum length of about 10 to 15 m in consideration of manufacturing at a factory and transportation restrictions to a construction site. For this reason, when the support layer in the construction site of the pile is deep and the pile hole has a depth of 50 to 70 m, a plurality of ready-made piles are added via a welded joint or a non-welded joint in the construction site. The so-called “joint pile method” is adopted.

  That is, with respect to the pre-bored pile hole, the top of the lower pile is held on the ground, the upper pile is hung on the top of the lower pile, and both piles are sequentially integrated in a substantially vertical direction. To the pile hole. In the work process, in order to hold the top of the lower pile in the state where it has come out above the ground, conventionally, a holding stand is placed in the opening of the pile hole, and the wire fixed to the holding stand is wound around the outer peripheral surface of the ready-made pile. The method of holding ready-made piles was used.

  However, with the increase in the height of buildings built on pile foundations and the increase in size, the diameter of ready-made piles is increased to about 1200 mm, and the weight is increased to about 70 t. Various problems occurred in work efficiency at the construction site. For example, as the weight of ready-made piles increases, the weight of the ready-made pile to which the wire is connected may be cut without being supported, or the lower pile may move during the work, and there is a danger in the subsequent work of connecting the ready-made piles. There was a problem that occurred. On the other hand, if the wire is made thicker to be able to withstand the weight of the pile, the risk of the wire being cut is reduced, but the wire is hard and difficult to bend, so it becomes difficult to give a strong tightening force. It took time and effort to fix the lower pile with wires.

  Regarding the conventional technology that enables connection of upper and lower piles without using wires when connecting and connecting multiple ready-made piles, there is a method of installing a pile holding device that holds the lower pile at the opening of the pile hole It is disclosed in Patent Document 1 and Patent Document 2. In each of the prior arts related to these patent documents, a locking means having a shape and size that fits within a pile hole diameter at a predetermined distance from the upper end of a ready-made pile is formed, and a holding cylinder or the like that can lock the locking means is held. By holding on the means, the upper pile and the lower pile can be connected without using a wire.

JP 2008-248493 A Japanese Patent No. 4437234

  When connecting a plurality of ready-made piles, a locking means provided on the ready-made piles is used to stably hold the ready-made piles that have been increased in diameter and weight by a pile holding device without using a wire. It is necessary to have durability against a certain amount of weight. In addition, when multiple prefabricated piles are connected and built into a pile hole, the prefabricated piles held by the pile holding device will be held in place more reliably without increasing the efficiency of construction work. It is important to

  Furthermore, in order to efficiently perform the work when attaching the pile holding device to the ready-made pile, it is preferable that it can be directly performed manually without using a heavy machine such as a crane. That is, in order to efficiently perform the work of attaching the pile holding device to the ready-made pile, it is desirable to reduce the weight of the pile holding device so that attachment by human power is possible. In the method of burying ready-made piles of Patent Document 1 and Patent Document 2, it is possible to connect a plurality of ready-made piles without using any wires, but the stability in place after reducing the weight of the pile holding device There is no mention of maintaining the retained state.

  The present invention has been made in view of the above problems, and provides a new and improved pile holding device capable of maintaining a stable holding state at a fixed position of a ready-made pile after reducing the weight of the device. The purpose is to provide.

One aspect of the present invention is a pile holding device capable of holding the ready-made pile in a substantially vertical direction at the opening of the pile hole when the ready-made pile is built in the pile hole, the outer peripheral surface of the ready-made pile being A substantially cylindrical holding cylinder wound around a predetermined portion, and at least 4 provided so as to project radially from the outer peripheral surface of the holding cylinder along the axial direction of the holding cylinder at predetermined angular intervals. One of a longitudinal rib, the length of the longitudinal ribs in the radial direction of the holding cylinder, the inner diameter of the pile bore the rather larger than 1/2 of the difference between the outer diameter of the ready-made pile, said holding cylinder Is formed in an annular shape along its inner peripheral surface, and has an annular recess formed of a tapered surface formed by expanding the diameter from the bottom side to the top side of the inner peripheral surface in the substantially vertical direction at a constant rate. The pre-made pile is integrally formed in an annular shape along a substantially cylindrical pile body and an outer peripheral surface of the pile body. An annular convex portion provided with a pile-side tapered surface formed by expanding the diameter of the pile body from a predetermined position on the outer peripheral surface in a direction having a certain ratio. When wound around a pile, the annular concave portion is fitted with the annular convex portion, and the tapered surface and the pile-side tapered surface are in contact with each other .

According to one aspect of the present invention, since the holding cylinder can be supported by the pile hole opening by the vertical rib provided on the outer periphery of the holding cylinder, the diameter of the holding cylinder is reduced and the weight is reduced. Can be achieved. Furthermore, when supporting the ready-made pile provided with the annular convex portion on the outer peripheral surface with the holding cylinder, the load from the pile-side tapered surface of the annular convex portion on the outer peripheral surface side of the pre-made pile is equal to the tapered surface of the annular concave portion. It becomes easy to start. For this reason, it is possible to maintain a stable holding state at a fixed position of the ready-made pile when the ready-made pile having a large diameter and weight is built in the pile hole after reducing the weight of the holding cylinder. it can.

  At this time, in one aspect of the present invention, the holding cylinder is configured by connecting both ends of two substantially semi-cylindrical holding pieces to each other, and one end of the both ends has a rotating shaft. Are connected to each other, and can be opened and closed from the other end of these holder pieces, and the vertical rib provided on one holder piece and the vertical rib provided on the other holder piece are: Each may be arranged symmetrically with respect to the center line of the holding cylinder.

  If it does in this way, while making it easy to attach a holding cylinder to a ready-made pile, a holding cylinder will be supported by a vertical rib in a more stable state.

  In one aspect of the present invention, the length of the vertical rib in the radial direction of the holding cylinder body is such that the two holding piece pieces are opened via the rotating shaft, and the one holding piece piece and the It is good also as length which the opening angle becomes a magnitude | size of at least 60 degree | times or more when the front-end | tip part of the said vertical rib provided in the said rotating shaft side of another holder piece contact | abuts.

  If it does in this way, even if it provides a vertical rib in the perimeter part of a maintenance cylinder, the open angle required when attaching a maintenance cylinder to a ready-made pile can be secured.

  In one aspect of the present invention, the vertical rib may be detachably attached to the outer peripheral surface of the holding cylinder through a reinforcing member that supports a proximal end side of the vertical rib.

  In this way, the vertical rib can be attached to the outer peripheral surface of the holding cylinder in a more stable state, and the desired length of the vertical rib can be easily set according to the diameter and weight of the ready-made pile and the diameter of the pile hole. It can be attached and detached.

  In one aspect of the present invention, an impact buffering member having a rubber hardness within a predetermined range may be provided on the inner peripheral surface of the tapered surface.

  In this way, the shock to the ready-made pile when supporting the ready-made pile is reduced, and the rattling of the ready-made pile when there is a manufacturing error, etc. of the ready-made pile is reduced, and the stable holding in place Is possible.

  Moreover, in one aspect of the present invention, the tapered surface may be configured such that an adaptable member that can change the inner peripheral surface thereof into a substantially cylindrical shape can be installed.

  If it does in this way, it will become applicable also to the holding of the straight pile in which the annular convex part etc. are not provided in the peripheral face of a ready-made pile.

  As described above, according to the present invention, since the holding cylinder can be supported by the pile hole opening by the vertical rib provided on the outer peripheral portion of the holding cylinder, the weight of the apparatus is reduced. It is possible to maintain a stable holding state at a fixed position of the ready-made pile.

It is a perspective view showing a schematic structure of a pile holding device concerning one embodiment of the present invention. It is a top view which shows schematic structure of the pile holding | maintenance apparatus which concerns on one Embodiment of this invention. It is AA sectional drawing of FIG. It is a top view which shows the state which open | released one connection part of the pile holding | maintenance apparatus which concerns on one Embodiment of this invention. It is a front view which shows the arrangement | positioning state of the shock-absorbing member provided in the inner peripheral surface side of the holding | maintenance cylinder of the pile holding device which concerns on one Embodiment of this invention. It is sectional drawing which shows the arrangement | positioning state of the shock-absorbing member provided in the inner peripheral surface side of the holding cylinder of the pile holding device which concerns on one Embodiment of this invention. (A), (B) is a schematic block diagram of the elastic buffer piece which comprises the impact buffer member provided in the inner peripheral surface side of the holding cylinder of the pile holding device which concerns on one Embodiment of this invention. (A), (B) is sectional drawing which shows the arrangement | positioning state of the modification of the impact buffering member provided in the inner peripheral surface side of the holding cylinder of the pile holding | maintenance apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the state which provided the adaptation member in the inner peripheral surface side of the holding cylinder of the pile holding device which concerns on one Embodiment of this invention. (A) thru | or (D) are explanatory drawings of construction operation at the time of applying to the pile holding | maintenance apparatus which concerns on one Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.

  First, the structure of the pile holding | maintenance apparatus which concerns on one Embodiment of this invention is demonstrated using drawing. FIG. 1 is a perspective view showing a schematic configuration of a pile holding device according to an embodiment of the present invention, FIG. 2 is a plan view showing a schematic configuration of a pile holding device according to an embodiment of the present invention, 3 is a cross-sectional view taken along the line AA in FIG. In addition, FIG. 3 is AA sectional drawing which avoided the connection parts 106 and 107 of the pile holding | maintenance apparatus 100 of the state holding the ready-made pile 10. FIG.

  As shown in FIGS. 1 to 3, the pile holding device 100 according to an embodiment of the present invention is configured to hold the ready-made pile 10 in a substantially vertical direction when the ready-made pile 10 is built in the pile hole 50. It is installed and used in the opening 50a of the pile hole 50. As shown in FIG. 1, the pile holding device 100 includes a substantially cylindrical holding cylinder 102 and four plate-like vertical ribs 120. On the upper end side of the holding cylinder 102, a suspension piece 126 for locking a suspension tool such as a wire is provided. In the present embodiment, four vertical ribs 120 are provided. However, at least four or more ribs need only be provided in order to ensure the minimum stability as the support means of the holding cylinder 102. Further, a configuration in which a greater number of vertical ribs 120 are provided may be employed.

  The holding cylinder 102 is wound around a predetermined portion of the outer peripheral surface 12c of the ready-made pile 10, and holds the ready-made pile 10 in a substantially vertical direction. The outer diameter of the holding cylinder 102 is formed to be smaller than the diameter of the pile hole 50.

  Each vertical rib 120 is provided so as to protrude radially outward from the outer peripheral surface 102 d of the holding cylinder 102. In addition, the upper and lower portions of each vertical rib 120 are disposed at positions on the axial upper side and axial lower side of the holding cylinder 102, respectively. That is, each vertical rib 120 is disposed along the axial direction of the holding cylinder 102 (Z direction shown in FIG. 1).

  Thus, even if the holding cylinder 102 is made smaller in diameter than the pile hole 50, the pile support device 100 is not dropped into the pile hole 50 by attaching the vertical rib 120 to the outer peripheral surface 102 d of the holding cylinder 102. Can be installed. Details of installation conditions such as an angular interval between adjacent vertical ribs 120 will be described later.

  In the present embodiment, the vertical rib 120 is provided substantially perpendicular to the outer peripheral surface 102d of the holding cylinder 102 via a reinforcing member that supports the proximal end side of the vertical rib 120, and is attached to and detached from the outer peripheral surface 102d. Installed as possible.

  Specifically, a pair of substantially rectangular reinforcing plates 121 provided so as to sandwich the vertical rib 120 are attached by welding or the like so as to stand in a substantially vertical direction with respect to the outer peripheral surface 102d. The vertical rib 120 is fixed between the reinforcing plates 121 with bolts 124 with the vertical rib 120 sandwiched between the pair of reinforcing plates 121.

  Further, the top side and the bottom side of each reinforcing plate 121 are supported by reinforcing support portions 122 and 123, respectively. The reinforcing support portions 122 and 123 are substantially triangular members, and are attached by welding or the like so as to stand upright in the substantially vertical direction with respect to the outer peripheral surface 102d of the holding cylinder 102.

  In this way, the reinforcing plate 121 and the reinforcing support portions 122 and 123 that serve as reinforcing members are used to reinforce the vertical ribs 120, so that when the ready-made pile 10 is held, the load acting on the vertical ribs 120 via the holding cylinder 102 is used. It is possible to prevent the vertical rib 120 from being deformed. Moreover, since the vertical rib 120 can be attached to the holding cylinder 102 via the reinforcing plate 121 and the reinforcing support portions 122 and 123, depending on the diameter and weight of the ready-made pile 10, the diameter of the pile hole 50, and the like. It is possible to easily replace the vertical rib 120 with a size or length.

  In this embodiment, after providing the substantially U-shaped pile receptacle 60 around the opening part 50a of the pile hole 10, the pile holding device is mounted by placing each vertical rib 120 on the pile receptacle 60. 100 is installed in the opening 50 a of the pile hole 50. In addition, when the ground GN in which the pile hole 50 is formed is stable or the like, the vertical rib 120 of the pile holding device 100 may be directly placed on the ground surface without placing the pile support 60. Good.

  In addition, in order to place the vertical rib 120 on the pile cradle 60 or the ground surface, the length of the vertical rib 120 needs to be larger than at least the gap between the pile hole 50 and the ready-made pile 10. That is, the length of the vertical rib 120 in the radial direction of the holding cylinder 102 (the length l of the vertical rib 120 shown in FIG. 4) is 1/2 of the difference between the diameter of the pile hole 50 and the outer diameter of the ready-made pile 10. In other words, it is necessary to make it larger than the difference between the radius of the pile hole 50 and the cross-sectional radius of the ready-made pile 10.

  As described above, since the holding cylinder body 102 can be supported by the vertical ribs 120 provided on the outer peripheral surface 102d of the holding cylinder body 102, the diameter of the holding cylinder body 120 can be reduced and the weight can be reduced. . That is, conventionally, as the diameter of the ready-made pile 10 is increased, the holding cylinder 102 of the pile holding device 100 is also increased in size, and the weight is increased, for example, to about 1 ton. When the holding cylinder 102 is about 1 ton, it is necessary to always use a heavy machine such as a crane when moving the pile holding device 100 or attaching the pile holding device 100 to the ready-made pile 10. Was large and inefficient.

  For this reason, in the present embodiment, the holding cylinder 102 is formed to a minimum size necessary for holding the ready-made pile 10, and the outer diameter of the holding cylinder 102 is smaller than the diameter of the pile hole 50. Thus, even when the weight of the pile holding device 100 is about half that of the conventional one, the pile holding device 100 can be supported by the surrounding ground GN of the opening 50a. Then, the vertical ribs 120 were radially attached to the outer peripheral surface 102 d of the holding cylinder 102 as support means for the holding cylinder 102. Further, as the supporting means of the holding cylinder 102, the vertical ribs 120 that protrude radially from the outer peripheral surface 102d of the holding cylinder 102 along the axial direction of the holding cylinder 102 are attached. It is possible to prevent deformation of the holding cylinder 102 while maintaining strength.

  Furthermore, in this embodiment, as shown in FIG. 3, the holding cylinder 102 can be fitted with an annular convex portion 18 formed on the outer peripheral surface 12 c of the pile body 12 of the ready-made pile 10 on the inner peripheral surface side. An annular recess is formed, and the ready-made pile 10 is supported in a substantially vertical direction by being wound around the ready-made pile 10 so as to cover the annular protrusion. Specifically, as shown in FIG. 3, as an annular recess, a taper formed on the inner peripheral surface side thereof with a diameter increasing from the bottom 102 b side to the top 102 a side of the holding cylinder 102 at a constant rate. A surface 102c is provided.

  The tapered surface 102c is formed in an annular shape along the inner peripheral surface side of the holding cylinder 102, and an impact buffer member 110 made of hard rubber or the like having a rubber hardness within a predetermined range is provided on the inner peripheral surface side. . In this embodiment, when attaching the pile holding device 100 to the ready-made pile 10, the shock to the ready-made pile 10 is reliably mitigated, and the ready-made pile 10 in the case where there is a clearance based on manufacturing errors of the ready-made pile 10, etc. The rubber hardness of the shock absorbing member 110 is set in the range of 50 degrees or more and less than 100 degrees so that the rattling is reduced and stable holding at a fixed position is possible. That is, in order to hold the ready-made pile 10 in a fixed position while buffering the impact due to the load of the ready-made pile 10 whose weight is increased as the diameter increases, the numerical range of the rubber hardness of the shock absorbing member 110 is 50 It is preferable that it is not less than 100 degrees and less than 100 degrees.

  The impact buffering member 110 provided on the tapered surface 102c may be any material having a rubber hardness within the above range. For example, a rubber-based material such as chloroprene rubber, ethylene propylene rubber, urethane rubber, silicon rubber, or fluorine rubber, A material used as an elastic material or a buffer material such as a synthetic resin material such as polystyrene is applied. “Rubber hardness” in the present specification refers to the hardness of an elastic material or a buffer material measured using a durometer based on the standards of ISO7619 or JIS_K — 6253 as a measuring instrument. In addition, the detailed structure etc. of the impact buffer member 110 provided in the taper surface 102c which has on the inner peripheral surface side of the holding cylinder 102 of the pile holding device 100 according to the present embodiment will be described later.

  Thus, in this embodiment, when the ready-made pile 10 is supported by the pile holding device 100, the tapered surface 14 (pile-side tapered surface) provided on the annular convex portion 18 of the ready-made pile 10 and the holding cylinder 102 The tapered surfaces 102c (support side tapered surfaces) provided on the inner peripheral surface side are configured to face each other with the shock absorbing member 110 interposed therebetween. For this reason, when supporting the ready-made pile 10 with the pile holding device 100, it becomes easy to apply a load equally to the pile side taper surface 14 which opposes the support side taper surface 102c used as an annular recessed part. Therefore, when the ready-made pile 10 which has been increased in weight with the increase in diameter is built in the pile hole 50, it is possible to support it in a stable state at a fixed position.

  Moreover, as shown in FIG. 2, the pile holding device 100 according to the present embodiment includes both end portions 103 a and 103 b of two substantially semi-cylindrical holding pieces 103 and 104 in which the holding cylinder 102 has substantially the same shape. , 104a, 104b are connected to each other to form a substantially cylindrical shape. Each holding | maintenance piece 103,104 is connected with the both ends 103a, 103b, 104a, 104b through the connection part 106,107 mutually.

  Of these connecting portions 106, 107, one support fixing connecting portion 106 is connected by a rotation fixing pin 105. Specifically, the support fixing connecting portion 106 supports and fixes one end portion 103 b of one holder piece 103 and one end portion 104 b of the other holder piece 104 with a rotation fixing pin 105. In other words, the support fixing connecting portion 106 rotatably supports and fixes the holder pieces 103 and 104 as a rotation shaft.

  On the other hand, the other opening / closing connecting portion 107 connects the holder pieces 103 and 104 with opening / closing attaching / detaching bolts 107a that can be attached and detached. Specifically, the connection part 107 for opening and closing connects the one end part 103a of one holder piece 103, and the one end part 104a of the other holder piece 104 so that attachment or detachment is possible with the attaching / detaching bolt 107a for opening and closing.

  Next, the detailed structure of the pile holding | maintenance apparatus which concerns on one Embodiment of this invention is demonstrated using drawing. Drawing 4 is a top view showing the state where one connection part of the pile maintenance device concerning one embodiment of the present invention was opened.

  As shown in FIG. 4, when the opening / closing connecting portion 107 is removed, the holder pieces 103, 104 are opened around the support / fixing connecting portion 106 when the opening / closing bolt 107 a is removed. That is, the opening / closing connecting portion 107 is configured to be detachable by inserting / removing the opening / closing attachment / detachment bolt 107a. When attaching / detaching the pile holding device 100 to / from the ready-made pile 10, the opening / closing attachment / detachment bolt 107a is removed, 103 and 104 are opened and closed.

  Further, as shown in FIG. 2, the vertical rib 120 provided on one holder piece 103 and the vertical rib 120 provided on the other holder piece 104 are more stable and the holding cylinder 102 has the vertical rib 120. Are arranged symmetrically with respect to each other via a center line L1 passing through the center O of the holding cylinder 102. That is, the angle θ between each vertical rib 120 and the center line L1 is substantially the same. The angle θ is preferably about 20 to 30 degrees in order to realize stable support while suppressing the length of the vertical rib 120 to the minimum necessary. Note that the “center line” referred to here is a center line L1 developed in the Y-axis direction shown in FIG. 2 connecting the support fixing connecting portion 106 and the opening / closing connecting portion 107 with the holding cylinder 102 closed. Say.

  As shown in FIG. 4, when the pile holding device 100 is attached to and detached from the ready-made pile 10, the ready-made pile 10 is inserted between the two holder pieces 103 and 104 with the holder pieces 103 and 104 opened. Therefore, it is necessary to secure an opening space at least larger than the outer diameter of the ready-made pile 10 between the both holder pieces 103 and 104. Specifically, when the holder pieces 103 and 104 are opened, the distance between the end 103a of the holder piece 103 and the end 104a of the holder piece 104 needs to be equal to or greater than the outer diameter of the ready-made pile 10. . That is, it is necessary that the opening angle α of both the holder pieces 103 and 104 be at least 60 degrees or more.

  When the two holder pieces 103 and 104 are both opened to the maximum with the support fixing connecting portion 106 as the center, the leading ends 120a of the vertical ribs 120 may come into contact with each other. Even in such a case, it is necessary to set the length l of the longitudinal rib 120 in the radial direction of the holding cylinder 102 so that the opening angle α of both the holder pieces 103 and 104 is at least 60 degrees or more.

  As described above, the pile holding device 100 according to the present embodiment has a configuration in which the holding cylinder body 102 is connected to the two holder pieces 103 and 104 by the connecting portions 106 and 107, so that the holding cylinder body 102 can be easily opened and closed. As a result, the holding cylinder 102 can be easily attached to the ready-made pile 10. For this reason, efficiency improvement of the construction work of the ready-made pile 10 in a construction site can be achieved. Moreover, since the length 1 of the vertical rib 120 is set to a length that can secure the minimum opening angle α necessary for the mounting operation of the holding cylinder 102 to the ready-made pile 10, the efficiency of the mounting operation is ensured. However, the weight of the holding cylinder 102 can be reduced.

  Next, the structure of the impact buffering member 110 provided on the inner peripheral surface side of the holding cylinder 102 of the pile holding device 100 according to one embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a front view showing an installation state of an impact buffer member 110 provided on the inner peripheral surface side of the holding cylinder 102 of the pile holding device 100 according to one embodiment of the present invention, and FIG. It is sectional drawing which shows the installation state of the impact buffering member 110 provided in the inner peripheral surface side of the holding cylinder 102 of the pile holding | maintenance apparatus 100 which concerns on one Embodiment. Moreover, FIG. 7 is a schematic block diagram of the elastic shock-absorbing piece 112 which comprises the shock-absorbing member 110 provided in the inner peripheral surface side of the holding | maintenance cylinder 102 of the pile holding device 100 which concerns on one Embodiment of this invention, FIG. 7A is a plan view, and FIG. 7B is a sectional view taken along line BB in FIG.

  An impact buffer member 110 is provided on the tapered surface 102 c provided on the inner peripheral surface side of the holding cylinder 102. In the present embodiment, as shown in FIG. 5, the shock buffering member 110 includes a plurality of substantially trapezoidal shock buffering pieces 112 arranged in parallel in the circumferential direction while forming gaps 114 at predetermined intervals along the tapered surface 102c. It is the structure provided as follows. That is, the shock buffering members 110 are provided on the tapered surface 102c by the shock buffering pieces 112 being juxtaposed with each other via the slit-shaped gap 114.

  As shown in FIG. 6, each impact buffering piece 112 is fixed by a bolt 116 that is fitted into a bolt hole 115 formed in the tapered surface 102c. In addition, a locking portion 118 for preventing the shock buffering piece 112 from moving downward is provided along the circumferential direction below the shock buffering piece 112. Thus, by providing the latching | locking part 118, when the ready-made pile 10 is hold | maintained, the impact buffering piece 112 is pulled below with the movement of the said ready-made pile 10, and the impact buffering piece 112 will peel off. Can be prevented.

  Since the shock absorbing pieces 112 are provided in parallel through the slit-shaped gap 114 so as to cover the tapered surface 102c formed so as to expand in diameter toward the upper end, as shown in FIG. The upper base 112a has a substantially trapezoidal shape somewhat longer than the lower base 112b. The lengths of the upper base 112a and the lower base 112b of the shock buffering piece 112 are appropriately determined according to the size of the taper angle of the tapered surface 102c so that the shock buffering pieces 112 are arranged through the equally spaced gaps 114. It is decided. Further, as shown in FIGS. 7A and 7B, a groove 117 is provided on the surface of the impact buffering piece 112 in order to make the load of the ready-made pile 10 easier to disperse.

  As described above, in this embodiment, the shock absorbing member 110 is configured such that a plurality of shock absorbing pieces 112 are arranged in parallel via the slit-shaped gap 114, so that the load of the ready-made pile 10 constitutes the shock absorbing member 110. It is possible to disperse each of the shock absorbing pieces 112 to be dispersed. For this reason, even when a part of the shock absorbing member 110 is deformed or deteriorated with the frequency of use, only the shock absorbing piece 112 corresponding to the deformed or deteriorated portion needs to be replaced. Maintenance to maintain the is easy. That is, the replacement frequency accompanying partial deformation of the shock absorbing member 110 can be reduced.

  In addition, when the shock absorbing member 110 is composed of only one shock absorbing piece 112, it is not possible to absorb the elongation in the circumferential direction of the shock absorbing piece 112 that occurs when the ready-made pile 10 is held. A part of the buffer piece 112 may extend inward. In such a case, the ready-made pile 10 may be pushed by a part of the shock absorbing piece 112 extending inward, and the central axis of the ready-made pile 10 and the central axis of the pile holding device 100 may be displaced. is there. For this reason, in this embodiment, the shock absorbing member 110 has a configuration in which a plurality of shock absorbing pieces 112 are arranged in parallel via the slit-shaped gap 114.

  In addition, the installation method of the impact buffering piece 112 which comprises the impact buffering member 110 is not limited to the above-mentioned content. That is, the impact buffering knitting 12 can be attached to the tapered surface 102c in a manner other than bolting. For example, as shown in FIG. 8A, a locking hook 218 is provided on the lower end side of the tapered surface 102c, and the impact buffering piece 212 is inserted at the timing of dropping in order to hold the ready-made pile 10 on the pile holding device 100. It is good also as providing. Further, as shown in FIG. 8B, a hook portion 313 that can be locked to the top portion 102 a of the holding cylinder 102 may be provided on the upper end side of the impact buffering piece 312 and may be retrofitted. By using the impact buffering pieces 212 and 312 according to such a modified example, it is possible to easily attach and detach in the course of the construction work without bolting in advance, thereby improving the efficiency of the construction work.

  Thus, in this embodiment, the shock to the ready-made pile 10 at the time of supporting the ready-made pile 10 is relieved by providing the shock absorbing member 110 having a rubber hardness within a predetermined range on the inner peripheral surface of the tapered surface. it can. Moreover, since the shock-absorbing member 110 having elastic force is provided on the tapered surface 102c, the clearance generated when there is a manufacturing error or the like of the ready-made pile 10 can be compensated. As a result, the backlash of 10 can be reduced and stable holding at a fixed position can be achieved.

  In the pile holding device 100 according to the above-described embodiment, the tapered surface 102c is provided on the inner peripheral surface side of the holding cylinder 102 in order to hold the ready-made pile 10 including the annular protrusion 18 on the outer peripheral surface 12c of the pile main body 12. The configuration is provided. However, the pile holding device 100 of this embodiment is adapted to be able to change its inner peripheral surface 130c to a substantially cylindrical shape as shown in FIG. 9 in order to be adaptable to a straight pile without the annular convex portion 18. It is good also as a structure in which the member 130 can be installed.

  Specifically, the fitting member 130 having a configuration in which the upper base 130a is larger than the lower base 130b is fastened to the tapered surface 102c with bolts 132, so that the inner peripheral surface 130c has a substantially cylindrical shape. At this time, a configuration that can be used in common with the bolt hole 115 for fixing the shock absorbing piece 112 may be used, or a configuration in which a bolt hole is separately provided.

  Next, construction operation when applied to a pile holding device according to an embodiment of the present invention will be described with reference to the drawings. FIGS. 10A to 10D are explanatory diagrams of the construction operation using the pile holding device according to one embodiment of the present invention.

  First, as shown in FIG. 10 (A), a pile support 60 is installed in the opening 50a of the pile hole 50. Next, the pile hanging device 150 including the hanging jig 152 and the hanging jig end plate 154 is attached to the top of the ready-made pile 10 to lift the ready-made pile 10. Specifically, the suspension jig 152 is attached to the top of the ready-made pile 10, and the suspension jig end plate 154 is attached to the top of the ready-made pile 10 with bolts, nuts, and the like, and the ready-made pile 10 is attached via the wire 156. lift. And the ready-made pile 10 is moved on the pile hole 50 formed in the ground GN used as a construction site.

  Next, as shown in FIG. 10B, the pile holding device 100 is installed on the pile receiving table 60. At that time, the opening / closing attachment / detachment pin 105b of the pile holding device 100 is removed and the holder pieces 103b and 103c are installed in an open state (see FIG. 4).

  Then, the ready-made pile 10 is built in the pile hole 50 so that the inside of the pile holding apparatus 100 of the open state may be passed. In the process of building the ready-made pile 10 in the pile hole 50, when the tapered surface 14 of the annular protrusion 18 approaches the opening 50a of the pile hole 50, the opening / closing attachment / detachment pin 105b is inserted and held in the opening / closing connection part 106b. The tool pieces 103b and 103c are connected, and the pile holding device 100 is closed (see FIG. 2).

  Then, the ready-made pile 10 is lowered | hung and the ready-made pile 10 is hold | maintained by the pile holding | maintenance apparatus 100 by closely contacting the taper surface 14 of the cyclic | annular convex part 18, and the taper surface 102c of the pile holding | maintenance apparatus 100. FIG. Then, the pile suspension device 150 is removed from the ready-made pile 10.

  In this embodiment, the support method of the ready-made pile 10 of the structure which provides the taper surface 14 in the lower side of the cyclic | annular convex part 18, and provides the taper surface 102c in the inner peripheral surface side of the holding cylinder 102 of the pile holding device 100, It has become. For this reason, after the pile holding device 100 is installed in the opening 50a of the pile hole 50, the ready-made pile 10 is dropped as it is, so that the tapered surface 14 of the annular convex portion 18 is fitted to the tapered surface 102c of the holding cylinder 102 as it is. The pile holding device 100 is attached to the ready-made pile 10 so as to be supported. That is, after making it easy to attach the pile holding device 100 to the ready-made pile 10, the ready-made pile 10 is guided in the direction supported by the tapered surface 102c of the holding cylinder 102 as it is by the dead weight of the ready-made pile 10, so 10 is held.

  And as shown in FIG.10 (C), the pile suspension apparatus 150 is attached to the ready-made pile 10b used as the upper pile connected with the top side of the ready-made pile 10a used as the lower pile which attached the pile holding | maintenance apparatus 100, and a lower pile The upper pile 10b is moved toward the top 12a side of 10a.

  Thereafter, as shown in FIG. 10 (D), when the top 12a of the lower pile 10a and the bottom 12b of the upper pile 10b come into contact with each other, the joint work of the lower pile 10a and the upper pile 10b is performed. When the joint work is completed, the pile holding device 100 is removed from the lower pile 10a, and the upper pile 10b is inserted into the pile hole 50 until the annular convex portion 18 of the upper pile 10b approaches the opening 50a of the pile hole 50.

  By repeating such a procedure, the connected ready-made pile 10 can be built in the pile hole 50 while jointing the ready-made pile 10. In this embodiment, the annular convex part 18 which has the taper surface 14 is provided in the outer peripheral surface 12c of the ready-made pile 10, and the inner peripheral surface side of the holding | maintenance cylinder 102 of the pile holding device 100 wound by the ready-made pile 10 is provided. An annular recess made of a tapered surface 102c is provided over the entire circumference. For this reason, when the ready-made pile 10 is supported by the holding cylinder 102, the load from the annular convex portion 18 on the outer peripheral surface side of the ready-made pile 10 is dispersed on the tapered surface 102c of the annular concave portion, and is easily applied evenly. .

  That is, when the ready-made pile 10 having an increased diameter and weight is supported by the holding cylinder 102 of the pile holding device 100, a stable holding state at a fixed position can be maintained. In other words, in the process of building the ready-made pile 10 in the pile hole 50, when the ready-made pile 10 is held by the pile holding device 100, the ready-made pile 10 is put in place in a more stable state without the ready-made pile 10 being shaken. It can be held in a substantially vertical direction.

  For this reason, the efficiency of the work of building in the pile hole 50 while adding the ready-made pile 10 is improved, and the safety in the construction work is also improved. In addition, when the upper pile 10b is added and connected to the lower pile 10a, the lower pile 10a including the annular convex portion 18 provided with the tapered surface 14 is put in place by the holding cylinder 102 including the annular concave portion including the tapered surface 102c. Since it is hold | maintained, the lower pile 10a and the upper pile 10b can be connected accurately.

  Although each embodiment of the present invention has been described in detail as described above, it is easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. It will be possible. Therefore, all such modifications are included in the scope of the present invention.

  For example, a term described with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configuration and operation of the pile holding device are not limited to those described in the embodiments of the present invention, and various modifications can be made.

10 ready-made piles, 10a lower pile, 10b upper pile, 12 pile body, 12a top (one end), 12b bottom, 12c outer peripheral surface, 14 tapered surface, 18 annular convex portion, 50 pile hole, 50a opening, 100 pile holding Device, 102 Holding cylinder, 102a Top, 102b Bottom, 102c Tapered surface (support side taper surface), 102d Outer peripheral surface, 103, 104 Holder piece, 103a, 103b, 104a, 104b Both ends, 105 Rotation fixing pin, 106 support fixing connection part (rotating shaft), 107 opening / closing connection part, 107a opening / closing attachment / detachment bolt, 110 impact buffering member, 112 impact buffering piece, 114 gap, 115 bolt hole, 116 bolt, 117 groove part, 118 locking part , 130 Applicable member, 130c Inner peripheral surface, 150 Pile hanger, L1 center line, l (Vertical rib) length

Claims (6)

When building the ready-made pile in the pile hole, the pile holding device capable of holding the ready-made pile in the substantially vertical direction at the opening of the pile hole,
A substantially cylindrical holding cylinder wound around a predetermined portion of the outer peripheral surface of the ready-made pile;
Comprising at least four vertical ribs provided to project radially from the outer peripheral surface of the holding cylinder along the axial direction of the holding cylinder at a predetermined angular interval;
The length of the longitudinal ribs in the radial direction of the holding cylinder is much larger than half the difference between the outer diameter of the prefabricated pile and the inner diameter of the pile hole,
The holding cylinder is formed in an annular shape along an inner peripheral surface thereof, and is formed from a tapered surface formed by expanding the diameter from the bottom side to the top side of the inner peripheral surface in the substantially vertical direction at a constant rate. Comprising an annular recess
The ready-made pile is integrally formed in a ring shape along a substantially cylindrical pile main body and the outer peripheral surface of the pile main body, and at a certain rate in a direction having one end portion of the pile main body from a predetermined position of the outer peripheral surface. An annular convex portion provided with a pile-side tapered surface formed by expanding the diameter,
When the holding cylinder is wound around a ready-made pile, the annular concave portion is fitted with the annular convex portion, and the tapered surface and the pile-side tapered surface are in contact with each other .   The holding cylinder is configured by connecting both end portions of two substantially semi-cylindrical holding pieces to each other, and one end portion of the both end portions is connected via a rotation shaft, thereby holding these holding pieces. The vertical ribs provided on one holding piece and the vertical ribs provided on the other holding piece can be opened and closed from the other end of the holding piece via the center line of the holding cylinder. The pile holding device according to claim 1, wherein the pile holding devices are arranged in line symmetry.   The length of the vertical rib in the radial direction of the holding cylinder body is such that the two holder pieces are opened via the rotary shaft, and the rotary shafts of the one holder piece and the other holder pieces are opened. The pile holding device according to claim 2, wherein when the leading ends of the vertical ribs respectively provided on the sides come into contact with each other, the opening angle is at least 60 degrees.   The said vertical rib is attached to the said outer peripheral surface of the said holding | maintenance cylinder through the reinforcement member which supports the base end side of this vertical rib so that attachment or detachment is possible. The pile holding device according to item 1.   The pile holding device according to any one of claims 1 to 4, wherein an impact buffering member having a rubber hardness within a predetermined range is provided on an inner peripheral surface of the tapered surface. The pile according to any one of claims 1 to 4, wherein the tapered surface has a configuration in which an adaptable member capable of changing an inner peripheral surface thereof into a substantially cylindrical shape can be installed. Holding device.

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