JP6604458B1 - Pile holding jig, pile holding jig assembly, and construction method for holding the position of the pile - Google Patents

Abstract

Provided is a pile holding jig that is reliably supported even when receiving the weight of the pile and rod. A pile holding jig 10 includes one of a half pipe, a flange projecting radially outward from an arcuate end of a lower end of the half pipe, and a pair of left and right edges extending in the vertical direction of the half pipe. A first fixing plate that protrudes from the edge to the outside of the half pipe; a second fixing plate that protrudes from the other edge of the pair of edges to the opposite side of the first fixing plate; A pair of holding pieces having reinforcing ribs 30a and 30b provided radially with respect to the central axis of the half pipe is provided between the outer peripheral surface of the half pipe. [Selection] Figure 3

Description

  The present invention relates to a pile holding jig, a pile holding jig assembly, and a construction method for holding the position of the pile.

There is a case in which a method of taking a distance between the pile tip position at the lower end of the pile and the bottom surface of the pile hole is used. When this construction method is adopted, for example, a pile holding jig disclosed in Patent Document 1 may be used to embed and fix the pile to a desired position.
In the pile holding jig, a pair of half pipes are attached to the outer periphery of a rod connected to a pile driving machine. While holding the pile head at the lower end of the rod, use a pile driver to embed the pile to the desired depth with respect to the pile hole, and then place the pile holding jig on the base placed on the ground. The lower surface is placed.

Japanese Patent No. 325684

  After the pile holding jig disclosed in Patent Document 1 is placed on the base on the ground, when the connection of the rod is released from the pile driving machine, depending on the degree of curing such as the root hardening liquid in the pile hole, There is a possibility that most of the weight of the pile and rod will be received by the pile holding jig placed on the base. Thus, it is necessary to support a pile holding jig reliably also by the weight of the pile and rod which can be several tens of tons.

  An object of the present invention is to provide a pile holding jig, a pile holding jig assembly, and a construction method for holding the position of the pile that are reliably supported even when receiving the weight of the pile and the rod.

  According to one aspect, a pile holding jig that is supported above the ground and prevents the pile from falling while being attached to a columnar rod having one end connected to a pile and the other end connected to a pile driver. The tool includes a first holding piece attached to the outer periphery of the rod, a second holding piece attached to the outer periphery of the rod, and a fastener for fastening the first holding piece and the second holding piece. The first holding piece and the second holding piece are respectively formed from a substantially arc-shaped half pipe attached to the outer periphery of the rod and an arcuate end of the lower end of the half pipe with respect to the central axis of the half pipe. A flange that protrudes radially outward, a first fixing plate that protrudes from one edge to the outside of the half pipe among a pair of left and right edges that extend in the vertical direction of the half pipe, and the pair of edges Of these, the second fixing plate that protrudes from the other edge to the outside of the half pipe on the opposite side of the first fixing plate, and the flange and the outer peripheral surface of the half pipe, with respect to the central axis And reinforcing ribs provided radially. The half pipe of the first holding piece and the half pipe of the second holding piece are attached to the outer periphery of the rod, and the flange of the first holding piece and the flange of the second holding piece are the center. When the first holding plate of the first holding piece and the first fixing plate of the second holding piece face each other in the circumferential direction around the axis of the shaft, the first holding piece of the first holding piece The second fixing plate and the second fixing plate of the second holding piece are opposed to each other and fastened by the fastener. The half pipes of the first holding piece and the second holding piece are attached to the outer periphery of the rod, and the first fixing plate of the first holding piece and the second holding piece is fastened by the first fastener. And when the connection between the pile driver and the rod is released in a state where the second fixing plate of the first holding piece and the second holding piece is fastened by the first fastener, the flange Is supported at a desired height position from the ground to prevent the rod to which the pile is connected from falling.

  According to this invention, when receiving the weight of a pile and a rod, the construction method which holds the position of a pile holding jig, a pile holding jig assembly, and a pile supported certainly can be provided.

FIG. 1A is a schematic front view of a pile holding jig according to an embodiment. FIG. 1B is a schematic left side view of a pile holding jig according to an embodiment. FIG. 1C is a schematic plan view of a pile holding jig according to one embodiment. FIG. 1D is a schematic bottom view of a pile holding jig according to an embodiment. FIG. 2A is a schematic view showing a state in which the pile head of the pile is caught by the rotary cap at the lower end of the rod in a state where the pile holding jig is fixed at an appropriate position on the outer periphery of the rod connected to the pile driving machine. is there. Fig. 2B shows the position of the rod and the pile with a pile driving machine with the pile tip position close to the bottom of the pile hole and the pile head placed at the desired depth with respect to the ground. It is the schematic which shows the state which has arrange | positioned the expansion / contraction tool (support tool) which supports the lower surface of a pile holding jig between the lower side of a tool, and a base. FIG. 2C is a schematic diagram illustrating a state in which the lower surface of the pile holding jig is supported at the support position of the upper end of the elastic device by adjusting the elastic device illustrated in FIG. 2B. FIG. 2D shows the position of the rod and pile with respect to the ground by releasing the connection between the pile driver and the rod while supporting the lower surface of the pile holding jig at the support position of the upper end of the extender shown in FIG. 2C. It is the schematic which shows the state which is maintaining. FIG. 3 is an enlarged schematic view of FIG. 2D showing a rod, a pile, a pile holding jig, a base, a cradle, and a telescopic tool with respect to a pile hole. FIG. 4A is a schematic diagram illustrating the state illustrated in FIGS. 2D and 3 as viewed from above in the vertical direction. 4B shows a state in which the rod, pile, and pile holding jig shown in FIG. 4A are rotated about 90 ° relative to the base with respect to the example shown in FIG. It is the schematic which shows the state currently supported in the support position. 4C shows the rod, pile, and pile holding jig shown in FIG. 4A rotated about 30 ° relative to the base shown in FIG. It is the schematic which shows the state currently supported in the support position of an upper end.

  An embodiment of a pile holding jig assembly having a pile holding jig 10 and an expansion / contraction tool (supporting tool) 110 will be described with reference to FIGS. 1A to 4C.

  The pile holding jig 10 according to the present embodiment (see FIGS. 1A to 4C) has one end (lower end) removably connected to the pile 520 and the other end (upper end) connected to the pile driving machine 500 (FIGS. 2A to 2C). (See FIG. 2A to FIG. 4C) and used. When the rod 510 is used by being connected to the pile driving machine 500, the longitudinal axis (center axis) L is directed in the vertical direction (vertical direction). A rotating cap 512 that can connect (catch) the pile head 522 of the pile 520 is disposed at the lower end of the rod 510. When the rod 510 is moved using the pile driving machine 500, the rod 510 and the pile 520 move along the longitudinal axis L along the vertical direction. When the rod 510 is rotated using the pile driving machine 500, the rod 510 and the pile 520 rotate around the longitudinal axis L. For this reason, the rod 510 has a vertical direction and a longitudinal axis L defined therein.

  The pile holding jig 10 is attached to the outer periphery of the rod 510 in accordance with the vertical direction of the rod 510. When the pile holding jig 10 is attached to the outer periphery of the rod 510, the center axis C is defined in the pile holding jig 10. The pile holding jig 10 is preferably formed symmetrically with respect to the central axis C.

  As shown in FIGS. 1A to 1D, the pile holding jig 10 has a first holding piece 12 and a second holding piece 14. The first holding piece 12 and the second holding piece 14 are generally formed in a state in which the cylinder is formed into a half crack. The pile holding jig 10 is a flange that protrudes radially outward at the lower ends of the first holding piece 12 and the second holding piece 14 that are substantially cylindrical when the first holding piece 12 and the second holding piece 14 are combined. 24a, 24b and appropriate reinforcing ribs 30a, 30b are formed. As shown in FIGS. 3 to 4C, the pile holding jig 10 fixes the first holding piece 12 and the second holding piece 14, the first fastener 16, the second fastener 18, and the third fastener. 20 Here, an example in which the pile holding jig 10 has three fasteners of the first fastener 16, the second fastener 18, and the third fastener 20 will be described. Here, it is assumed that the first fastener 16 and the second fastener 18 are separated from each other, and the third fastener 20 is disposed between the first fastener 16 and the second fastener 18. The pile holding jig 10 may have only two fasteners of the first fastener 16 and the second fastener 18, or may have more fasteners such as four. In the present embodiment, the first fastener 16 is described as a single fastener, but may have a plurality of fasteners.

  It is preferable that the first holding piece 12 and the second holding piece 14 have the same size and the same shape. The first holding piece 12 and the second holding piece 14 are preferably made of steel, for example. The first holding piece 12 and the second holding piece 14 are formed with the rod 510 and the pile 520 above the ground G in a state where the pile 520 (see FIGS. 2A to 3) is placed in a pre-formed pile hole 530. As long as it can withstand gravity and can maintain the vertical positions of the rod 510 and the pile 520, the material is not limited to steel, and an appropriate material such as a resin material that is lighter than steel, such as FRP, may be used.

  In the present embodiment, an example in which bolts 92 and nuts 94 having appropriate diameters are used as the first fastener 16, the second fastener 18, and the third fastener 20, respectively, will be described. In addition, an appropriate fastener such as a plurality of clamps (not shown) is used as long as it can be reliably fixed between the first fixing plates 26a and 26b described later and between the second fixing plates 28a and 28b. Can be done. In addition, the space between the first fixing plates 26a and 26b and the space between the second fixing plates 28a and 28b can be fixed by appropriate fixing pins (not shown).

  The cross section at an appropriate position of the rod 510 connected to the pile driver 500 is often circular. Here, for simplification of description, it is assumed that the rod 510 has a cylindrical shape and the rod 510 has a perfect cross section. Here, when the pile holding jig 10 is appropriately attached to the outer periphery of the rod 510, the longitudinal axis L of the rod 510 and the center axis C of the pile holding jig 10 are assumed to coincide. That is, in a state where the pile holding jig 10 is attached to the outer periphery of the rod 10, the central axis C of the pile holding jig 10 and the longitudinal axis L of the rod 510 are coaxial.

  As described above, the second holding piece 14 is formed in the same size and shape as the first holding piece 12. The second holding piece 14 is formed symmetrically with respect to the central axis C with respect to the first holding piece 12. For this reason, the structure of the 1st holding piece 12 is demonstrated here and description of the structure of the 2nd holding piece 14 is abbreviate | omitted suitably. When indicating the structure of the first holding piece 12, a lowercase letter “a” is attached to the reference sign as necessary, and when showing the structure of the second holding piece 14, a lowercase letter “b” is attached to the reference sign as necessary. Shall.

  The first holding piece 12 includes a half pipe 22a, a flange 24a, a first fixing plate 26a, a second fixing plate 28a, a plurality of reinforcing ribs 30a, a plurality of first ribs 32a, and a plurality of second ribs. 34a. Here, the flange 24a, the first fixing plate 26a, and the second fixing plate 28a are fixed to the half pipe 22a by, for example, welding. The reinforcing rib 30a is fixed to the outer peripheral surface 44a of the half pipe 22a and the upper surface 62a of the flange 24a, for example, by welding. The plurality of reinforcing ribs 30a are provided radially with respect to the central axis C, respectively.

  The half pipe 22a has an inner peripheral surface 42a, an outer peripheral surface 44a, a pair of arcuate ends 46a, 48a, and a pair of edges 50a, 52a formed between the pair of arcuate ends 46a, 48a. . The central axis C is defined by the inner peripheral surface 42a and / or the outer peripheral surface 44a of the half pipe 22a. That is, the half pipe 22a of the first holding piece 12 and the half pipe 22b of the second holding piece 14 each define a central axis C. The pair of edges 50a and 52a are preferably in a state parallel to the central axis C. The pair of arcuate ends 46a and 48a are formed as a part of a substantially arc. The pair of arcuate ends 46a and 48a have an inner peripheral arc continuous with the inner peripheral surface 42a of the half pipe 22a and an outer peripheral arc continuous with the outer peripheral surface 44a of the half pipe 22a. The pair of arcuate ends 46a and 48a is smaller than 180 ° with respect to the central axis C. The surfaces formed by the pair of arcuate ends 46a and 48a are parallel to each other.

  The inner peripheral surface 42 a of the half pipe 22 a is formed in a shape substantially along the outer periphery of the rod 510. Specifically, the inner peripheral surface 42a of the half pipe 22a is in a state where the center position between the edges 50a and 52a of the inner peripheral surface 42a of the half pipe 22a is in contact with the outer periphery of the rod 510. 52a and the outer periphery of the rod 510 are formed in a shape in which a slight gap (for example, 2 mm to 3 mm) exists. For this reason, the inner peripheral surface 42a and / or the outer peripheral surface 44a of the half pipe 22a actually have a distance between the edges 50a and 50b as a major axis, and a straight line orthogonal to the major axis passing through the edges 50a and 50b as a minor axis. It is formed in a substantially elliptical shape. In this case, when the bolts 92 and nuts 94 are fastened between the first fixing plates 26a and 26b and between the second fixing plates 28a and 28b, respectively, positions in the vicinity of the edges 50a and 52a in the half pipe 22a. Is elastically deformed, and the inner peripheral surface 42a of the half pipe 22a is easily brought into contact with the outer periphery of the rod 510.

  The flange 24a is fixed to a position serving as a lower end of the pair of arcuate ends 46a and 48a of the half pipe 22a. The flange 24a protrudes radially outward with respect to the outer peripheral surface 44a of the half pipe 22a, and has an upper surface (reinforcing rib forming surface) 62a and a lower surface (reinforcing rib non-forming surface) 64a. The upper surface 62a and the lower surface 64a of the flange 24a are preferably formed as surfaces orthogonal to the inner peripheral surface 42a and the outer peripheral surface 44a of the half pipe 22a, respectively. Each of the upper surface 62a and the lower surface 64a of the flange 24a is preferably a flat surface.

  The inner edge and the outer edge 66a of the flange 24a have inner and outer arcs smaller than 180 ° with respect to the central axis C, respectively, similarly to the half pipe 22a. The inner edge and the outer edge 66a of the flange 24a are each substantially arc-shaped.

The upper surface 62a of the flange 24a has a surface determined by the outer peripheral surface 44a of the half pipe 22a, the outer edge 66a of the flange 24a, and the fixing plates 26a and 28a. Unlike the upper surface 62a, the lower surface 64a of the flange 24a has a surface determined by the inner peripheral surface 42a of the half pipe 22a, the outer edge 66a of the flange 24a, and the fixing plates 26a and 28a.
The distance Dft along the radial direction with respect to the central axis C of the upper surface 62a of the flange 24a is smaller than the distance Dfu along the radial direction with respect to the central axis C of the lower surface 64a of the flange 24a. The radial distance Dfu of the lower surface 64a of the flange 24a is formed such that, for example, the upper end (supporting position) 114 of the extensible tool 110 such as the jack 112 can be contacted in an appropriate area. As the stretchable tool 110, for example, one that can support the weight of the rod 510, the pile holding jig 10, and the pile 520 is used by one or more. When an appropriate jack 112 is used as the stretching tool 110, the distance Dfu is, for example, 100 mm or more.

In the present embodiment, the size of the upper end 114 of the jack 112 and the flange 24a when the reinforcing rib 30a is disposed on the upper surface 62a of the flange 24a when the upper end 114 of the jack 112 is brought into contact with the lower surface 64a of the flange 24a. Considering the amount of deformation, the size, material, thickness, etc. of the flange 24a are set.
Various types of jacks 112 such as journal jacks are used.

  When the rod 510 and the pile holding jig 10 are viewed from above, as shown in FIGS. 4A to 4C, a part of the upper end 114 of the extender 110 is radially outward from the outer edge 66a of the flange 24a with respect to the central axis C. You may stick out. When the stretchable tool 110 has a central axis, it is only necessary that the central axis of the stretchable tool 110 intersects the lower surfaces 64a and 64b of the flanges 24a and 24b.

  FIG. 1B shows an example in which the lower end of the half pipe 22a and the flange 24a are fitted and welded. The inner edge of the flange 24a may be fixed to the outer peripheral surface 44a at the lower end of the half pipe 22a by welding or the like. Further, the lower end of the half pipe 22a may be fixed by welding or the like with the lower end being placed on the inner edge of the flange 24a.

  The reinforcing rib 30a has an outer edge at a position radially outward from the outer peripheral surface 44a of the half pipe 22a with respect to the central axis C. The distance Dr1 between the outer peripheral surface 44a of the half pipe 22a and the outer edge of the reinforcing rib 30a is preferably the same as the distance Dft or slightly smaller than the distance Dft. The distance Dr1 only needs to be able to appropriately suppress the deformation of the flange 24a by the reinforcing rib 30a, such as within the range of 90% to 110% of the distance Dft.

  The first fixed plate 26a and the second fixed plate 28a are each formed in a substantially rectangular shape. The first fixed plate 26a protrudes from one edge 50a of the half pipe 22a toward the outside of the half pipe 22a. The second fixed plate 28a protrudes from the other edge 52a of the half pipe 22a toward the outside of the half pipe 22a. The second fixing plate 28a protrudes on the side opposite to the first fixing plate 26a with respect to the central axis C. The first fixing plate 26a and the second fixing plate 28a are preferably formed in a state having a pair of surfaces parallel to the central axis C.

The first fixing plate 26a penetrates the non-facing surface 72a on which the first rib 32a is formed, the facing surface 74a facing the first fixing plate 26b of the second holding piece 14, and the non-facing surface 72a and the facing surface 74a. And a plurality of bolt holes 76. The non-facing surface 72a and the facing surface 74a are preferably parallel to the central axis C when the pile holding jig 10 is appropriately attached to the rod 510.
The non-facing surface 72a of the first fixed plate 26a and the non-facing surface 82a described later of the second fixed plate 28a are preferably parallel. It is preferable that the facing surface 74a of the first fixed plate 26a and a facing surface 84a (described later) of the second fixed plate 28a are parallel to each other.
In the present embodiment, the first fixing plate 26 a has three bolt holes 76. When the length (height) L0, width W0, and thickness T are defined in the first fixed plate 26a, the three bolt holes 76 define the length of the first fixed plate 26a among the first fixed plates 26a. It is formed in the center position of width W0 along the direction to do. As shown in FIG. 1B, the center of the bolt hole 76 does not have to be at the center of the width W0 of the fixing plate 26a, and some deviation is allowed. That is, the bolt hole 76 is not only formed at the center position of the width of the first fixing plate 26a, but may be positioned closer to the edge 50a of the half pipe 22a than the center position. It may be in a position farther from the edge 50a of the half pipe 22a than the position.

  Note that the length L0 is preferably larger than the outer diameter (= 2R) of the rod 510. That is, the vertical length of the half pipe 22a is larger than the diameter of the rod 510. In this case, not only the contact area of the first holding piece 12 and the second holding piece 14 with respect to the circumference of the outer periphery of the rod 510 but also the contact area with the component parallel to the central axis C can be increased.

  The diameters of the three bolt holes 76 are preferably the same. The bolt holes 76 are preferably formed at equal intervals L1 and L1. The distance L2 between the center of the upper bolt hole 76 and the upper end of the fixing plate 26a is preferably smaller than the distance L3 between the center of the lower bolt hole 76 and the lower end of the fixing plate 26a. That is, the distance L3 between the center of the lower bolt hole 76 and the lower end of the fixing plate 26a is larger than the distance L2. For this reason, when using a suitable tool for fixing the volt | bolt 92 and the nut 94 to the lower volt | bolt hole 76, it is suppressed that workability | operativity falls.

There may be two bolt holes 76. In this case, the distance between the bolt holes 76 is larger than that in the case where the three bolt holes 76 are formed. The two bolt holes 76 are spaced apart on the upper side and the lower side. The first rib 32a has a plurality of bolt holes 76 (the first fastener 16, the second fastener 18, and the third fastener 20) between the first fixing plate 26a and the outer peripheral surface 44a of the half pipe 22a. Of these, the adjacent bolt holes 76 (between the fasteners 16 and 18 and between the fasteners 18 and 20) are configured to be partitioned.
The bolt holes 76 are on the same axis when the first fixing plates 26a, 26b are properly facing each other.

  The 1st rib 32a is being fixed to the non-facing surface 72a which does not oppose the 2nd holding piece 14 among the outer peripheral surface 44a of the half pipe 22a and the 1st fixing plate 26a, for example by welding. The 2nd rib 34a is being fixed to the non-facing surface 82a which does not oppose the 2nd holding piece 14 among the outer peripheral surface 44a and the 2nd fixing board 28a of the half pipe 22a, for example by welding.

  In particular, the first rib 32 a is fixed to the middle between the upper bolt hole 76 and the intermediate bolt hole 76 and between the intermediate bolt hole 76 and the lower bolt hole 76. That is, the 1st rib 32a is between the 1st fixing plate 26a and the outer peripheral surface 44a of the half pipe 22a, between the adjacent fasteners 16 and 18 among the fasteners 16, 18, and 20, and the fastener 18. , 20 is divided. Each of the first ribs 32a has a substantially triangular plate shape. A part of the first rib 32a is formed in a curved surface fixed to the outer peripheral surface 44a of the half pipe 22a. And the deformation | transformation of the 1st fixing plate 26a is suppressed by the 1st rib 32a.

  The first rib 32a has an outer edge at a position radially outward from the outer peripheral surface 44a of the half pipe 22a with respect to the central axis C. The distance Dr2 between the outer peripheral surface 44a of the half pipe 22a and the outer edge of the first rib 32a is preferably slightly smaller than the width W0 along the radial direction of the fixed plate 26a. The distance Dr2 can be appropriately suppressed by the first rib 32a such that the distance Dr2 is within a range of 90% to 110% of the width W0. What is necessary is just to be able to use the tool mentioned later appropriately. That is, the width (distance) W0 between the outer peripheral surface 44a of the half pipe 22a and the outer edge of the first fixed plate 26a is set along the radial direction with respect to the central axis C along the outer peripheral surface 44a of the half pipe 22a and the first rib 32a. It is preferable that the distance Dr2 is between 90% and 110% with respect to the outer edge in the radial direction.

Similar to the relationship between the first fixing plate 26a and the first rib 32a, the second fixing plate 28a is provided with a second rib 34a. As shown in FIG. 1B, the second rib 34a is preferably formed symmetrically with the first rib 32a. The second fixing plate 28a penetrates the non-facing surface 82a on which the second rib 34a is formed, the facing surface 84a facing the second fixing plate 28b of the second holding piece 14, and the non-facing surface 82a and the facing surface 84a. And a plurality of bolt holes 86. The non-facing surface 82a of the second fixing plate 28a is on the same plane as the non-facing surface 72a of the first fixing plate 26a, and the facing surface 84a of the second fixing plate 28a is flush with the facing surface 74a of the first fixing plate 26a. It is preferred that it be on top. Further, the non-facing surface 72a and the facing surface 74a of the first fixing plate 26a and the non-facing surface 82a and the facing surface 84a of the second fixing plate 28a are perpendicular to the upper surface 62a and the lower surface 64a of the flange 24a.
The bolt holes 86 are on the same axis when the second fixing plates 28a, 28b are properly facing each other.

  The reinforcing ribs 30a described above are fixed to the upper surface 62a of the flange 24a by welding at regular intervals. In the present embodiment, the first fixed plate 26a and the second fixed plate 28a are formed at positions shifted from the central axis C by approximately 45 °, approximately 90 °, and approximately 135 °. The reinforcing ribs 30a each have a substantially triangular plate shape.

  As shown in FIG. 1C, when the first holding piece 12 of the pile holding jig 10 is viewed from above, the reinforcing rib 30a and the first rib 32a are separated from each other. Similarly, the reinforcing rib 30a and the second rib 34a are separated from each other. Therefore, an appropriate tool such as a spanner / wrench used when fixing the bolt 92 and the nut 94 to the bolt holes 76 and 86 interferes with the reinforcing rib 30a, the first rib 32a, and the second rib 34a. It is suppressed.

Here, the dimension of the 1st holding piece 12 of the pile holding jig 10 shown to FIG. 1A to FIG. 1D is illustrated.
Although it changes according to the outer diameter (diameter) of the rod 510, the inner diameter (diameter) of the inner peripheral surface 42a of the half pipe 22a is, for example, 260 mm to 320 mm. The inner diameter (diameter) of the inner peripheral surface 42a of the half pipe 22a is 269 mm as an example.
The height of the 1st holding piece 12 is 300 mm as an example. The plate thickness between the inner peripheral surface 42a and the outer peripheral surface 44a of the half pipe 22a is 19 mm.
The diameters of the bolt holes 76 and 86 are each 24 mm.
Of the flange 24a, the distance between the inner peripheral surface 42a of the half pipe 22a and the outer edge 66a of the flange 24a is 100 mm.
The reinforcing rib 30a has a length of 90 mm at a position fixed along the radial direction with respect to the central axis C on the upper surface 62a of the flange 24a, and is in a direction parallel to the central axis C on the outer peripheral surface 44a of the half pipe 22a. The length of the position fixed along is 90 mm.
As an example, the first fixed plate 26a is formed to have a height L0: 278 mm × width W0: 86 mm × thickness T: 22 mm. The three bolt holes 76 are spaced by 90 mm (= L1). The upper bolt hole 76 is formed at a position of 45 mm (= L2) from the upper end of the first fixing plate 26a and a diameter of 26 mm at the center of the width. The lower bolt hole 76 is formed at a position of 53 mm (= L3) from the lower end of the first fixing plate 26a and a diameter of 26 mm at the center of the width (W1 = W2 = 86 mm). For example, a bolt 92 of M24 is inserted into the bolt hole 76. The bolt hole 76 at the intermediate position is formed with a diameter of 26 mm at a position that is 90 mm away from the upper bolt hole 76 and the lower bolt hole 76, respectively, at the center of the width.

  The first rib 32a has a distance of 60 mm from the non-facing surface 72a of the first fixing plate 26a to a position distal to the non-facing surface 72a, and the length Dr2 along the width of the non-facing surface 72a is substantially the same. 80 mm.

  As an example, the outer diameter of the rod 510 is about 267 mm to 315 mm. Here, it is assumed that the outer diameter of the rod 510 is 272 mm.

  The thickness of each steel material is about 20 mm. The length of the pair of left and right edges 50a and 52a of the half pipe 22a is about 300 mm, for example, and is formed larger than the outer diameter of the rod 510. The distance between the pair of edges 50a and 52a is 269 mm.

  The bolt holes 76 and 86 are M24. The distance Dfu between the inner peripheral surface 42a of the half pipe 22a and the outer edge 66a of the flange 24a is approximately 100 mm. For this reason, the distance between the inner peripheral surface 42a of the half pipe 22a continuous with the inner edge of the flange 24a and the outer edge 66a of the flange 24a exceeds about 100 mm.

  The lower surfaces 64a and 64b of the flanges 24a and 24b extend and contract in the vertical direction, and are supported by a plurality of extenders 110 that can support heavy objects of several tons to tens of tons or more. Here, an example in which an appropriate jack 112 is used as the extender 110 will be described. In addition, it is suitable for the jack 112 of this embodiment to use what has a load resistance of about dozen tons to dozens of tons, respectively. In addition to using the jack 112, the height with respect to the ground G may be defined by stacking blocks of an appropriate size as the stretching tool (supporting tool) 110, and the jack 112 may be used instead.

  The lower surface 64a of the flange 24a according to the present embodiment is formed such that the distance Dfu between the inner edge and the outer edge 66a along the inner peripheral surface 42a of the half pipe 22a is approximately 100 mm. This is large enough to be supported by the upper end 114 of a suitable jack 112.

(Work procedure (construction method))
Next, after fixing the pile holding jig 10 to the outer periphery of the rod 510 and erection of the pile 520 into the pile hole 530, the rod 510 and the pile 520 are fixed using the pile holding jig assembly. A construction method for maintaining the vertical position will be described.

  When the rod 510 is connected to the pile driver 500, the rod 510 extends in the vertical direction. Pile holding so that the flanges 24a and 24b are arranged on the lower side of the outer periphery of the rod 510 connected to the pile driving machine 500 at a position away from the rotary cap 512 at the lower end of the rod 510 by a desired distance. The jig 10 is attached. In particular, the lower surfaces 64a and 64b of the flanges 24a and 24b of the pile holding jig 10 are fixed to the outer periphery of the rod 510 at a desired distance from the rotating cap 512. Note that there is no need to worry about the direction of the central axis C of the pile holding jig 10 relative to the outer periphery of the rod 510.

  Here, the attachment operation | work which attaches the pile holding jig 10 which concerns on this embodiment to the outer periphery of the rod 510 is demonstrated.

  When attaching the pile holding jig 10 to the outer periphery of the rod 510, the longitudinal axis L of the rod 510 is arranged in the vertical direction (vertical direction). Alternatively, the longitudinal axis L of the rod 510 may be arranged horizontally or close to the ground G. Here, for simplification of description, the pile holding jig 10 is attached to the outer periphery of the rod 510 in a state where the longitudinal axis L of the rod 510 is arranged in the vertical direction (vertical direction).

  When attaching the pile holding jig 10 to the outer periphery of the rod 510, the pile holding jig 10 makes the first holding piece 12 and the second holding piece 14 face each other so that the longitudinal axis L is sandwiched between the outer circumference of the rod 510. That is, the first holding piece 12 is attached to the outer periphery of the rod 510, and the second holding piece 14 is attached to the outer periphery of the rod 510. At this time, the inner peripheral surfaces 42 a and 42 b of the half pipes 22 a and 22 b are arranged along the outer periphery of the rod 510. The flanges 24 a and 24 b of the pile holding jig 10 are arranged at a position (lower side) near the rotation cap 512 of the rod 510. The central axis C of the half pipe 22a of the first holding piece 12 and the central axis C of the half pipe 22b of the second holding piece 14 may coincide with each other or may be shifted. Here, for simplification of explanation, the center axis C of the half pipe 22a of the first holding piece 12 and the center axis C of the half pipe 22b of the second holding piece 14 coincide with each other, and one pile holding jig 10 is provided. The description will be made assuming that the center axis C is provided. The flange 24a of the first holding piece 12 and the flange 24b of the second holding piece 14 are adjacent to each other in the circumferential direction around the central axis C. Further, the first fixed plates 26a and 26b are opposed to each other, and the second fixed plates 28a and 28b are opposed to each other. In this state, the first fixing plates 26a and 26b are fixed using the three fasteners 16, 18, and 20 (bolts 92 and nuts 94, respectively), and the second fixing plates 28a and 28b are fixed to the three fasteners 16, 18 and 20 (bolts 92 and nuts 94), respectively. That is, the first holding piece 12 and the second holding piece 14 are fastened by the fasteners 16, 18, and 20. At this time, the lower end of the pile holding jig 10 becomes a substantially circular ring perpendicular to the central axis C by the two flanges 24a and 24b. The first holding piece 12 and the second holding piece 14 are fastened by the fasteners 16, 18, and 20, respectively, but there is no direct contact between the first holding piece 12 and the second holding piece 14, It is separated. At this time, the central axis C of the half pipe 22a of the first holding piece 12, the central axis C of the half pipe 22b of the second holding piece 14, and the longitudinal axis L of the rod 510 coincide.

  In order to reliably prevent the pile holding jig 10 from dropping off from the outer periphery of the rod 510, the pile holding jig 10 is firmly fixed by six fasteners 16, 18, and 20 each having appropriate strength. Fasteners 16, 18, and 20 for fixing the opposing first fixing plates 26a and 26b at three locations, and fasteners 16, 18, and 20 for fixing the opposing second fixing plates 28a and 28b at three locations are the center. Along the axis parallel to the axis C, there are positions at appropriate intervals in the vertical direction. The plurality of ribs 32a and 32b respectively formed on the first fixing plates 26a and 26b have intervals allowing the work of a tool such as a spanner or a wrench to fasten the fasteners 16, 18, and 20, and the half pipes 22a and 22b. Are formed so as to protrude from the outer peripheral surfaces 44a and 44b. Similarly, the plurality of ribs 34a and 34b formed on the second fixing plates 28a and 28b respectively allow an interval for allowing the tool to fasten the fasteners 16, 18, and 20 and the outer circumferences of the half pipes 22a and 22b. It is formed in a protruding amount with respect to the surfaces 44a and 44b. For this reason, the holding force of the upper part of the pile holding jig 10, the holding force of the lower part, and the holding force of the intermediate part between the upper part and the lower part are appropriately and firmly secured to the outer periphery of the rod 510. Can be.

  Assuming that the cross section orthogonal to the longitudinal axis L of the rod 510 is a perfect circle, the inner peripheral surfaces 42a and 42b of the half pipes 22a and 22b are considered in consideration of fastening (tightening) by the fasteners 16, 18, and 20. Is formed so that the width between the edges 50 a and 52 a and the width between the edges 50 b and 52 b are slightly larger than the outer peripheral surface of the rod 510 than the semicircle of a perfect circle. By fastening the fasteners 16, 18, and 20, the inner peripheral surfaces 42 a and 42 b of the half pipes 22 a and 22 b are elastically deformed and are in close contact with the outer periphery of the rod 510.

  Then, the holding force of the upper part, the lower part, and the intermediate part of the pile holding jig 10 can be balanced with the fasteners 16, 18, and 20 with respect to the outer periphery of the rod 510.

  In addition, when it is one fastener with respect to the fixing plates 26a and 26b and one fastener with respect to the fixing plates 28a and 28b, the first holding piece 12 and the second holding piece 14 with respect to the rod 510. There is a possibility that the lower end and the upper ends of the first holding piece 12 and the second holding piece 14 come into contact with each other. In this case, an excessive load may be applied to the rod 510. On the other hand, in the pile holding jig 10 of this embodiment, the holding force with respect to the outer periphery of the rod 510 is balanced by a plurality of fasteners 16, 18, 20 such as three on the opposing fixing plates 26 a, 26 b, and face each other. The holding force with respect to the outer periphery of the rod 510 is balanced by a plurality of fasteners 16, 18, 20 such as three on the fixing plates 28a, 28b. For this reason, the inner peripheral surfaces 42a and 42b of the pile holding jig 10 can be brought into contact with a larger area with respect to the outer periphery of the rod 510.

  The first ribs 32a and 32b prevent the first fixing plates 26a and 26b from being deformed excessively by fastening the fasteners 16, 18, and 20. The second ribs 34a and 34b prevent the second fixing plates 28a and 28b from being deformed excessively by fastening the fasteners 16, 18, and 20. For this reason, the range in which the bolt 92 and the nut 94 stop is appropriately set. Therefore, the pile holding jig 10 is attached to a desired position on the outer periphery of the rod 510 in a desired tightening condition using a plurality of fasteners 16, 18, and 20, respectively.

  A series of operations for installing the pile 520 in the pile hole 530 where the mining operation has been performed and fixing the pile 520 to the ground G at a desired depth will be described.

  A U-shaped base 540 called a “Kanzashi” or a rod cradle is placed on the ground G that is the entrance of the pile hole 530. The base 540 is made of, for example, steel. At this time, the distance between the pair of extending portions 542 and 544 of the base 540 is larger than the outer diameter of the pile 520 and larger than the outer diameter of the rotating cap 512. It is preferable that a connecting plate 541 that connects the pair of extending portions 542 and 544 is fixed between the pair of extending portions 542 and 544 of the base 540.

  When the base 540 is disposed on the ground G, the extending portions 542 and 544 of the base 540 are disposed so as to surround the pile hole 530. If the pile 520 is appropriately built in the pile hole 530, the extending portions 542 and 544 may be disposed on the upper side of the edge of the pile hole 530.

  The upper surface of the base 540 is preferably horizontal, but may be inclined. The upper surfaces of the pair of extending portions 542 and 544 are preferably horizontal, but may be inclined.

  The pile holding jig assembly (pile holding jig 10 and expansion / contraction tool 110) according to the present embodiment is used in a construction method that takes a distance between the pile tip position 524 at the lower end of the pile 520 and the bottom surface 532 of the pile hole 530. . For this reason, the mining length from the ground G to the bottom surface 532 of the pile hole 530 is set appropriately, and the bottom surface 532 of the pile hole 530 is below the pile tip position 524 of the pile 520.

  When the pile hole 530 is mined up to the bottom surface 532 of the pile hole 530, the root hardening liquid is injected into the mining bottom, and the root consolidation part 534 is built. Further, a pile periphery fixing liquid that is filled around the pile 520 and fixes the pile 520 is injected. At this time, the root hardening part 534 exists in the bottom part of the pile hole 530, and the pile periphery fixing liquid is satisfy | filled on it.

  The pile tip position 524 of the pile 520 is inserted toward the bottom surface 532 of the pile hole 530 by a crane or the like (not shown). When the length of the pile 520 is insufficient with respect to the depth of the pile hole 530, the pile 520 is connected to the upper side by an appropriate joint (not shown) as necessary.

  The pile 520 is held by a crane or the like, and the pile head 500 is appropriately moved in a state where the pile head 522 is above the ground G, and the pile head 522 of the pile 520 is caught by the cap 512 at the lower end of the rod 510. . That is, the lower end of the rod 510 is connected to the pile head 522 at the upper end of the pile 520. At this time, the pile head 522 of the pile 520 is coupled to the rotary cap 512 at the lower end of the rod 510 connected to the pile driving machine 500. Thereafter, the holding of the pile 520 with a crane or the like is released. At this time, the root consolidation portion 534 at the bottom of the pile hole 530 is in the middle of curing. For this reason, when the connection of the rod 510 to the pile driving machine 500 is released, the pile tip position 524 is usually brought into contact with the bottom surface 532 due to the weight of the rod 510, the pile holding jig 10 and the pile 520, for example, several tens of tons. Try to get closer. The pile driving machine 500 holds the weights of the rod 510, the pile holding jig 10, and the pile 520.

  Pile 520 and rod 510 are on a common longitudinal axis L. The longitudinal axis L is preferably parallel to the vertical direction.

  The pile driver 500 is moved, and the pile 520 is built into the pile hole 530 while being self-sunk or rotated from the entrance of the pile hole 530 through the pair of extending portions 542 and 544 of the base 540. While moving the pile driver 500, the pile head 522 of the pile 520 and the rotation cap 512 at the lower end of the rod 510 are put below the ground G as shown in FIG. 2B.

  And if the depth of the pile head 522 of the pile 520 with respect to the ground G enters in the desired range, the operation of the pile driving machine 500 is stopped, and the positions of the rod 510 and the pile 520 are maintained by the pile driving machine 500.

  When measuring the position of the pile head 522 of the pile 520 or the position of the rotary cap 512, the lower end of the measuring rod with markings is applied to the top of the pile head 522 of the pile 520 or the top of the rotary cap. The distance between the lower end of the measuring rod and the marking position is set in a desired state in advance. The height position of the marking with respect to the ground G is measured with a measuring machine, and the depth position of the top of the pile 522 of the pile 520 or the top of the rotation cap with respect to the ground G is confirmed.

  When the depth position of the top of the pile head 522 of the pile 520 or the rotating cap with respect to the ground G is further brought closer to a desired state, the pile driver 500 is moved, and the top of the pile head 522 of the pile 520 or the rotating cap with respect to the ground G is moved. The depth position of the end is moved to a desired position. The lower end of the measuring rod is again applied to the top end of the pile head 522 of the pile 520 or the top end of the rotation cap. The height position of the marking with respect to the ground G is measured with a measuring machine, and the depth position of the top of the pile 522 of the pile 520 or the top of the rotation cap with respect to the ground G is confirmed.

  The position of the pile head 522 of the pile 520 is required to be arranged within a control value (± 100 mm) from a desired design position. Actually, by the operation of the pile driving machine 500, the position of the pile head 522 of the pile 520 can be suppressed to an error within about several centimeters from the desired position. On the other hand, the position of the pile head 522 of the pile 520 can be set within a range of, for example, 0 mm to − (minus) 50 mm from a desired position according to customer requirements.

  The distance between the top end of the pile head 522 of the pile 520 or the top end of the rotary cap 512 and the lower surfaces 64a and 64b of the flanges 24a and 24b of the pile holding jig 10 can be measured in advance. For this reason, the pile head 522 of the pile 520 is located at a desired depth position with respect to the pile hole 530 by checking the height positions of the lower surfaces 64a and 64b of the flanges 24a and 24b with respect to the ground G using a measuring instrument or the like. It can also be determined whether or not it is.

  For this reason, the lower surfaces 64a and 64b of the flanges 24a and 24b can be used as marking positions. For example, when the pile holding jig 10 is fixed at an appropriate position on the outer periphery of the rod 510, and the lower surfaces 64 a and 64 b of the flanges 24 a and 24 b are arranged at a position of 1 m from the ground G, the pile head 522 of the pile 520 The depth position can be set to a desired position.

  As shown in FIGS. 2B to 4C, a pair of receiving bases 546 and 548 are placed so as to bridge the pair of extending portions 542 and 544 of the base 540. The upper surfaces of the cradles 546 and 548 are formed in a plane. The cradles 546 and 548 are made of steel prisms or H-shaped steel, for example. The upper surfaces of the cradles 546 and 548 are preferably horizontal, but may not be horizontal.

  The pair of extending portions 542 and 544 of the base 540 are separated from the rod 510, but the opposing side surfaces of the receiving bases 546 and 548 are close to or in contact with the outer periphery of the rod 510. The jack 112 is placed on the upper surfaces of the cradles 546 and 548.

  The position of the upper end 114 of the jack 112 is adjusted by moving it upward and brought into contact with the lower surfaces 64a and 64b of the flanges 24a and 24b of the pile holding jig 10. The protruding length of the upper end 114 of the jack 112 with respect to the upper surface of the cradle 546, 548 differs depending on whether the upper surface of the cradle 546, 548 is horizontal. When not horizontal, the adjustment amount of the upper end 114 of one jack 112 is different from the adjustment amount of the upper end 114 of the other jack 112. That is, the position of the upper end 114 of one jack 112 and the position of the upper end 114 of the other jack 112 can be adjusted independently.

  For this reason, when supporting the lower surfaces 64a and 64b of the flanges 24a and 24b of the pile holding jig 10 using a plurality of jacks 112, the accuracy in the depth direction can be improved. Moreover, it is easy to level the lower surfaces 64a and 64b of the flanges 24a and 24b of the pile holding jig 10 by the plurality of jacks 112. For this reason, in cooperation with the pile driver 500, it is easy to arrange the longitudinal axis L of the rod 510 in the vertical direction.

  The weights of the pile driver 500, the rod 510, and the pile 520 may be a few dozen tons to a few dozen tons. For this reason, even if the upper end 114 of the jack 112 is brought into strong contact with the lower surface 64a of the flange 24a of the pile holding jig 10, the positions of the rod 510 and the pile 520 held by the pile driving machine 500 are prevented from moving upward. . In this way, the lower surface 64a of the flange 24a of the pile holding jig 10 is supported by the upper end 114 of the jack 112. At this time, the gravity of the rod 510, the pile holding jig 10, and the pile 520 held by only the pile driving machine 500 is received by the pile driving machine 500 and the upper end 114 of the jack 112.

  For example, in addition to the self-sinking of the rod 510, the rotation of the rod 510 causes the pile tip position 524 of the pile 520 to approach the bottom surface 532 of the pile hole 530, and the like, between the pile tip position 524 of the pile 520 and the bottom surface 532 of the pile hole 530. The distance of is adjusted. When the position of the pile head 522 of the pile 520 is set to a desired depth, it may be difficult to set the direction of the pile holding jig 10 with respect to the base 540 to a predetermined arrangement. In the present embodiment, there is no need to be aware of the orientation of the pile holding jig 10 with respect to the base 540, for example, as shown in FIGS. 4A, 4B, and 4C.

  As shown in FIG. 4B, the lower positions of the fixing plates 26a and 26b and the lower positions of the fixing plates 28a and 28b of the flanges 24a and 24b may be supported by the upper end 114 of the jack 112. In this case, the opposing fixing plates 26 a and 26 b are appropriately fixed by the fasteners 16, 18 and 20, and the opposing fixing plates 28 a and 28 b are appropriately fixed by the fasteners 16, 18 and 20. For this reason, the fixing plates 26a, 26b, 28a, 28b are used as ribs for suppressing deformation of the flanges 24a, 24b.

  As shown in FIG. 4C, the positions of the lower surfaces 64 a and 64 b of the flanges 24 a and 24 b where the reinforcing ribs 30 a and 30 b are not formed on the upper side may be supported by the upper end 114 of the jack 112. Deformation of the flanges 24a and 24b is suppressed by the reinforcing ribs 30a and 30b between the upper surfaces 62a and 62b of the flanges 24a and 24b and the outer peripheral surfaces 44a and 44b of the half pipes 22a and 22b. Even in this case, the gravity of the rod 510 and the pile 520 can be received by the lower surfaces 64 a and 64 b of the flanges 24 a and 24 b supported by the upper end 114 of the jack 112.

  In the pile holding jig 10 of the present embodiment, the position at which the upper end 114 of the jack 112 contacts the lower surface 64a of the flange 24a is an appropriate position from the inside to the outside in the radial direction of the lower surface 64a of the flange 24a. Is acceptable.

  When the pile driver 500 is moved and the rod 510 and the pile 520 are rotated around the longitudinal axis L to adjust the position of the pile head 522 of the pile 520, the upper end of the jack 112 with respect to the lower surfaces 64a and 64b of the flanges 24a and 24b. Each of the support positions 114 is changed. When the pile driving machine 500 is moved and the rod 510 and the pile 520 are rotated around the longitudinal axis L, the pedestals 546 and 548 and the jack 112 placed on the base 540 are separated from the pile holding jig 10. It is preferable that it is separated from the position adjacent to the rod 510.

  In this state, as shown in FIG. 2D, the connection between the pile driving machine 500 and the upper end of the rod 510 is released. After releasing the rod 510 from the pile driver 500, the pile driver 500 is used to perform another operation such as excavating another pile hole.

  Gravity acts on the rod 510, the pile holding jig 10, and the pile 520 so that the pile tip position 524 of the pile 520 moves toward the bottom surface 532 of the pile hole 530. The gravity held by the pile driver 500 and the upper end 114 of the jack 112 is applied to the upper end 114 of the jack 112. For this reason, the gravity of the rod 510, the pile holding jig 10, and the pile 520 is loaded on the jack 112. Here, in the vicinity of the bottom surface 532 of the pile hole 530, there is a root-solidifying liquid that forms the root-solidifying portion 534, and there is a pile-periphery fixing liquid that fixes the outer periphery of the pile 520 in the upper layer of the root-solidifying liquid. It is considered that buoyancy is generated in the pile 520. For this reason, it is actually assumed that a weight smaller than the weight of the rod 510, the pile holding jig 10, and the pile 520 is loaded on the upper end 114 of the jack 112.

  A reaction force equivalent to the load applied to the upper end 114 of the jack 112 is applied to the lower surfaces 64 a and 64 b of the flanges 24 a and 24 b of the pile holding jig 10. The lower surfaces 64a and 64b of the flanges 24a and 24b may be loaded with the gravity of the rod 510 and the pile 520 through the upper end 114 of the jack 112, such as several tens of tons. At this time, deformation of the flanges 24a, 24b is suppressed by the reinforcing ribs 30a, 30b connected between the upper surfaces 62a, 62b of the flanges 24a, 24b and the outer peripheral surfaces 44a, 44b of the half pipes 22a, 22b.

  Bolts 92 and nuts 94 of the fasteners 16, 18, and 20 are fixed to the fixing plates 26a and 26b and the fixing plates 28a and 28b. For this reason, even if the weight of the rod 510 and the pile 520 is loaded on the pile holding jig 10, it is prevented that the fixed plates 26a and 26b and the fixed plates 28a and 28b are about to leave. In particular, the fixing plates 26a and 26b whose deformation is suppressed by the ribs 32a and 32b, the upper bolt 92 and the nut 94 of the fixing plates 28a and 28b whose deformation is suppressed by the ribs 34a and 34b, and the lower bolt 92 and the nut 94. This prevents the inner peripheral surfaces 42a, 42b of the half pipes 22a, 22b from leaving the outer periphery of the rod 510.

  Therefore, when the pile holding jig 10 according to the present embodiment is appropriately attached to the outer periphery of the rod 510, the state where the pile holding jig 10 is fixed to the outer periphery of the rod 510 is more reliably maintained. By using the pile holding jig assembly, even a heavy object such as the rod 510 and the pile 520 has a distance between the pile tip position 524 at the lower end of the pile 520 and the bottom surface 532 of the pile hole 530. Is maintained.

  In FIG. 4A to FIG. 4C, an example is shown in which one flange 112 is supported by the upper end 114 of one jack 112. That is, the two flanges 24a and 24b are supported by the upper ends 114 of the two jacks 112. The upper surfaces 114 of the plurality of jacks 112 may support the lower surface 64a of one flange 24a.

By using the pile holding jig assembly having the pile holding jig 10 and the expansion / contraction tool 110 in this way, the pile is held at a desired height with respect to the ground G until the pile 520 is fixed to the pile hole 530. The jig 10 can be held.
That is, when the pile driving machine 500 and the rod 510 are connected, the upper end of the extension tool 110 is brought into contact with the flanges 24a and 24b of the pile holding jig 10 to support the pile holding jig 10 at a desired height. In addition, the pile 520 can be supported at a desired depth by the rod 510 to which the pile holding jig 10 is attached. Further, the pile holding jig 10 is supported at a desired height, and the pile 520 is supported at a desired depth by the rod 510 to which the pile holding jig 10 is attached. When the connection is released, it is possible to prevent the pile 520 from falling by maintaining the pile holding jig 10 at a desired height from the ground.

It takes several hours, for example, until the root hardening part 534 and the pile periphery fixing liquid are cured in a state where the position of the pile 520 is maintained. After an appropriate time has elapsed and the pile 520 is fixed to the pile hole 530, the pile driving machine 500 is connected to the upper end of the rod 510 again. At this time, the weight of the rod 510 and the pile holding jig 10 is held by the pile driving machine 500. Then, the jack 112 is appropriately operated to move the upper end 114 of the jack 112 downward to release the state where the upper end 114 of the jack 112 supports the lower surfaces 64a and 64b of the flanges 24a and 24b. The pile driving machine 500 is moved to remove the rotating cap 512 from the pile head 522 of the pile 520. And the pile driving machine 500 is moved and the rotation cap 512 is extracted from the pile hole 530. The rod 510 with the cap 512 at the lower end is reused.
Instead of using the pile driving machine 500, the rod 510 is held using an appropriate construction machine, the connection state between the pile head 522 of the pile 520 and the rotating cap 512 of the rod 510 is released, and the position of the pile 520 is changed. The rod 510 may be extracted from the pile hole 530 while maintaining.

  In this state, the pile 520 is fixed to the pile hole 530 in a state where the pile tip position 524 of the pile 520 is separated from the bottom surface 532 of the pile hole 530.

  In the present embodiment, the example in which the receiving bases 546 and 548 are used on the base 540 has been described, but the stretchable tool 110 may be directly disposed on the pair of extending portions 542 and 544 of the base 540. In this case, the cradles 546 and 548 may be unnecessary.

  It is assumed that the pile 520 in the pile hole 530 is loaded with a force obtained by reducing the buoyancy obtained from the cement milk or the like in the pile hole 530 from the weight of the pile 520. The rod 510 is loaded with its own weight. For this reason, although it is assumed that the pile holding jig 10 is loaded with a force smaller than the weight of the pile 520 and the rod 510, the force can be several tens of tons.

  In the present embodiment, the ribs 32a and 34a fixed between the fixing plates 26a and 28a and the outer peripheral surface 44a of the half pipe 22a, and the fixing plates 26b and 28b and the outer peripheral surface 44b of the half pipe 22b are fixed. The ribs 32b and 34b suppress unintended deformation between the fixed plates 26a and 26b and between the fixed plates 28a and 28b. Even when a proper tool is used to fix the fixing plates 26a and 26b and the fixing plates 28a and 28b with the fasteners 16, 18, and 20, the reinforcing ribs 30a and 30b and the first rib 32a are used. 32b and the second ribs 34a, 34b can be prevented from interfering with each other. Therefore, the deformation between the fixing plates 26a and 26b and the fixing plates 28a and 28b is suppressed, and the tool and the reinforcing ribs 30a and 30b, the first ribs 32a and 32b, the second ribs 34a and 34b, By suppressing the interference, the variation of the fixing force by the fasteners 16, 18, and 20 is suppressed. Therefore, the fixing plates 26a and 26b and the fixing plates 28a and 28b are fixed by the fasteners 16, 18 and 20 with a predetermined fixing force. As described above, the first holding piece 12 and the second holding piece 14 of the pile holding jig 10 of the present embodiment are in a state where the deformation of the fixing plates 26a, 26b, 28a, 28b is suppressed on the outer periphery of the rod 510. Securely fixed. Accordingly, even when the pile holding jig 10 is repeatedly attached to and detached from the outer periphery of the rod 510, the first holding piece 12 and the second holding piece are placed on the outer peripheral surface of the rod 510 with a predetermined fixing force or a state close thereto. 14 can be fixed.

  In the present embodiment, the lower surfaces 64 a and 64 b of the flanges 24 a and 24 b are large enough to be supported by the upper end 114 of the extender 110. The reinforcing rib 30a is fixed between the upper surface 62a of the flange 24a and the outer peripheral surface 44a of the half pipe 22a, and the reinforcing rib 30b is fixed between the upper surface 62b of the flange 24b and the outer peripheral surface 44b of the half pipe 22b. The outer edges of the reinforcing ribs 30a and 30b are close to the outer edges of the flanges 24a and 24b. For this reason, even if a very large force such as several tens tons to several tens of tons is applied to the flanges 24a and 24b via the stretchable tool 110, deformation of the flanges 24a and 24b can be suppressed. The reinforcing ribs 30a and 30b may be one or plural depending on the thickness and strength of the material.

  The pile holding jig 10 fixed with respect to the outer periphery of the rod 510 is moved in the axial direction of the longitudinal axis L of the rod 510 even when a large force such as ten to several tens of tons is applied to the flanges 24a and 24b. Can be prevented from slipping. For this reason, even if a large force is applied to the pile holding jig 10 through the flanges 24a and 24b, the pile holding jig 10 is maintained in a fixed state with the rod 510. Therefore, when the positions of the rod 510 and the pile 520 are held by the pile holding jig 10 via the stretching tool 110, the positional relationship of the rod 510, the pile holding jig 10, and the pile 520 can be held. Therefore, the pile holding jig 10 according to the present embodiment is supported above the ground in a state where one end is connected to the pile 520 and the other end is attached to the columnar rod 510 connected to the pile driving machine 500. Thus, the rod 510 can be prevented from falling, that is, the pile 520 can be prevented from falling. Thus, according to the present embodiment, the pile holding jig 10, the pile holding jig assembly, and the position of the pile 520 are reliably supported even when receiving the weight of the pile 520 and the rod 510. A construction method can be provided.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be appropriately combined as much as possible, and in that case, the combined effect can be obtained. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

  DESCRIPTION OF SYMBOLS 10 ... Pile holding jig, 12 ... 1st holding piece, 14 ... 2nd holding piece, 16 ... 1st fastener, 18 ... 2nd fastener, 20 ... 3rd fastener, 22a ... 1st half pipe, 22b 2nd half pipe, 24a ... 1st flange, 24b ... 2nd flange, 26a, 26b ... 1st fixing plate, 28a, 28b ... 2nd fixing plate, 30a, 30b ... Reinforcement rib, 32a, 32b ... 1st rib 34a, 34b ... second rib, 42a, 42b ... inner peripheral surface, 44a, 44b ... outer peripheral surface, 46a, 46b, 48a, 48b ... arc end, 50a, 50b, 52a, 52b ... edge, 62a, 62b ... upper surface 64a, 64b ... lower surface, 66a, 66b ... outer edge, 72a ... non-facing surface, 74a ... facing surface, 76 ... bolt hole, 82a, 82b ... non-facing surface, 84a ... facing surface, 86 ... bolt hole, 92 ... bolt 94 ... nuts DESCRIPTION OF SYMBOLS 110 ... Telescopic tool, 112 ... Jack, 114 ... Upper end, 500 ... Pile driver, 510 ... Rod, 512 ... Rotation cap, 520 ... Pile, 522 ... Pile head, 524 ... Pile tip position, 530 ... Pile hole, 532 ... Bottom.

Claims (11)

In a state where one end is connected to a pile and the other end is attached to a columnar rod connected to a pile driver, a pile holding jig that is supported above the ground and prevents the pile from falling,
A first holding piece attached to the outer periphery of the rod;
A second holding piece attached to the outer periphery of the rod;
A first fastener for fastening the first holding piece and the second holding piece;
The first holding piece and the second holding piece are respectively
A substantially arc-shaped half pipe attached to the outer periphery of the rod;
A flange projecting radially outward with respect to a central axis of the half pipe from an arcuate end serving as a lower end of the half pipe;
Of the pair of left and right edges extending in the vertical direction of the half pipe, a first fixing plate protruding from one edge to the outside of the half pipe;
A second fixing plate protruding outside the half pipe from the other edge of the pair of edges to the opposite side of the first fixing plate;
Reinforcing ribs provided radially with respect to the central axis between the flange and the outer peripheral surface of the half pipe;
The half pipe of the first holding piece and the half pipe of the second holding piece are attached to the outer periphery of the rod, and the flange of the first holding piece and the flange of the second holding piece are the center. When the first holding plate of the first holding piece and the first fixing plate of the second holding piece face each other in the circumferential direction around the axis of the shaft, the first holding piece of the first holding piece The second fixing plate and the second fixing plate of the second holding piece are configured to face each other and fastened by the first fastener, respectively.
The half pipes of the first holding piece and the second holding piece are attached to the outer periphery of the rod, and the first fixing plate of the first holding piece and the second holding piece is fastened by the first fastener. And when the connection between the pile driver and the rod is released in a state where the second fixing plate of the first holding piece and the second holding piece is fastened by the first fastener, the flange A pile holding jig configured to prevent the rod, to which the pile is connected, from falling by supporting the pile at a desired height position from the ground. The radially outer edges of the flanges are each arcuate,
The distance between the outer peripheral surface of the half pipe and the outer edge of the flange is, along the radial direction with respect to the central axis, the outer peripheral surface of the half pipe and the outer peripheral edge of the reinforcing rib in the radial direction. The pile holding jig according to claim 1 which is in the range of 90% to 110% with respect to the distance between. A second fastener for fastening the first holding piece and the second holding piece, provided at a position adjacent to the first fastener;
A first rib configured to partition between the first fastener and the second fastener is provided between the first fixing plate and the outer peripheral surface of the half pipe, respectively.
Between the said 2nd fixing plate and the said outer peripheral surface of the said half pipe, the 2nd rib comprised so that it might partition between the said 1st fastener and the said 2nd fastener, respectively is provided. The pile holding jig according to claim 1 or claim 2. The distance between the outer peripheral surface of the half pipe and the outer edge of the first fixing plate is the radial outer side of the outer peripheral surface of the half pipe and the first rib along the radial direction with respect to the central axis. Within a range of 90% to 110% with respect to the distance to the outer edge of
The distance between the outer peripheral surface of the half pipe and the outer edge of the second fixing plate is the radial outer direction of the outer peripheral surface of the half pipe and the second rib along the radial direction with respect to the central axis. The pile holding jig according to claim 3, wherein the pile holding jig is within a range of 90% to 110% with respect to a distance between the outer edge and the outer edge. When the first holding piece is viewed from above, the reinforcing rib and the first rib are spaced apart from each other, and the reinforcing rib and the second rib are separated from each other,
4. The device according to claim 3, wherein when the second holding piece is viewed from above, the reinforcing rib and the first rib are spaced apart from each other, and the reinforcing rib and the second rib are separated from each other. 4. The pile holding jig according to 4.   The pile holding jig according to any one of claims 1 to 5, wherein a length of the half pipe in a vertical direction is larger than a diameter of the rod. A pile holding jig according to any one of claims 1 to 6,
When the pile holding jig is attached to the outer periphery of the rod, the flange is provided with a support tool disposed between the ground,
When the pile driving machine and the rod are connected, the upper end of the support is brought into contact with the flange of the pile holding jig to support the pile holding jig at a desired height, and The pile is supported at a desired depth by the rod to which a pile holding jig is attached, the pile holding jig is supported at the desired height, and the rod to which the pile holding jig is attached is When the pile driving machine and the rod are disconnected in a state where the pile is supported at the desired depth, the pile holding jig is maintained at a desired height from the ground. Pile holding jig assembly configured to prevent falling.   The pile holding according to claim 7, wherein a plurality of jacks that can independently adjust the supporting position of the flange and can support the flange of the pile holding jig at the supporting position are used as the support. Jig assembly. Using the pile holding jig assembly according to claim 7 or 8, the position of the rod connected to the pile driving machine and the pile having a pile head connected to the lower end of the rod A construction method for maintaining the position of
The pile driving jig attached to the outer periphery of the rod, the rod connected to the pile driving machine by moving the pile driving machine with a base placed on the ground so as to surround the pile hole And moving the pile, and placing the pile head of the pile at the desired depth with respect to the ground in a state where the pile tip position of the pile is spaced upward from the bottom surface of the pile hole, Arranging the flange of the pile holding jig at the desired height with respect to the ground;
Arranging a plurality of cradles on the base, and causing the plurality of cradles to be adjacent to the rod;
Disposing the support between the plurality of cradles and the flange,
The construction method including adjusting the height of the support tool and supporting the flange with the support tool.   The construction method according to claim 9, comprising: releasing the connection between the pile driver and the rod after supporting the flange with the support tool.   The height of the support relative to the flange is changed when the pile driver is moved to rotate the rod and the pile around the longitudinal axis of the rod, respectively. Item 10. The construction method according to Item 10.