JP6623566B2 - Steel pipe pile burying method and steel pipe pile burying system - Google Patents

Description

  The present disclosure relates to a steel pipe pile burying method and a steel pipe pile burying system.

In cast-in-place piles, steel pipe piles may be buried below the construction reference plane. In this type of cast-in-place pile construction method, as disclosed in Patent Document 1, a steel pipe pile is pressed into the ground by a rotary press machine. Then, in order to press-fit the head of the steel pipe pile below the construction reference plane, the lower pipe is connected to the steel pipe pile, and the rotary press machine grips the lower pipe and press-fits the steel pipe pile.
As disclosed in Patent Document 2, for example, a rotary press machine has a plurality of chuck members that can rotate and vertically move while pinching a steel pipe pile.

JP 2014-189948 A JP 2002-88756 A

In the pile burying method disclosed in Patent Literature 1, a projection member projecting from the inner peripheral surface of the steel pipe pile is used for engagement between the lower yoke and the steel pipe pile. In consideration of the insertability of a digging device such as a hammer club or a steel cage into a steel pipe pile or the like, it is preferable that the projection member be provided on the outer peripheral surface of the pile.
However, when the projecting member projects from the outer peripheral surface of the steel pipe pile, there is a problem that the projecting member interferes with the chuck member and cannot pass through the rotary press-fitting machine.

  In view of the above circumstances, at least one embodiment of the present invention aims to connect a connecting member to a steel pipe pile and to connect a steel pipe even if an engagement portion engageable with the connecting member protrudes from the outer peripheral surface of the steel pipe pile. An object of the present invention is to provide a steel pipe pile embedding method and a steel pipe pile embedding system, which are capable of rotationally pressing a pile below a construction reference plane using a rotary press machine.

(1) A method for burying a steel pipe pile according to at least one embodiment of the present invention includes:
A steel pipe pile embedding method of embedding a steel pipe pile having an engagement portion protruding from an outer peripheral surface at one end side in an axial direction below a construction reference plane,
A large-diameter portion capable of accommodating the engagement portion and being engageable with the engagement portion and being externally fitted to one end of the steel pipe pile; and the steel pipe pile being coaxial with the large-diameter portion. Preparing a connecting member having a small diameter portion having the same outer diameter as;
A plurality of chuck members arranged around a rotation axis along a vertical direction, the plurality of chucks in the vertical direction between a lower position above the construction reference plane and an upper position above the lower position; A vertical movement mechanism configured to reciprocate a member, a rotation mechanism configured to rotate the plurality of chuck members around the rotation axis, and a clamping position in a radial direction intersecting the rotation axis And preparing a rotary press-fitting machine including a chuck mechanism configured to move the plurality of chuck members between a release position outside of the holding position.
A plurality of reduced diameter members that can be attached to the inside of the plurality of chuck members in the radial direction, wherein the plurality of chuck members at the holding position can directly hold a large diameter portion of the connection member. Meanwhile, a step of preparing a plurality of reduced diameter members that allow the plurality of chuck members at the holding position to clamp the steel pipe pile via the plurality of reduced diameter members,
A rotary press-fitting step repeatedly performed by the rotary press-fitting machine, wherein each of the rotary press-fitting steps includes:
A first step of moving the plurality of chuck members to the holding position at the upper position, and holding the object to be held in the radial direction by the plurality of chuck members;
A second step of moving the plurality of chuck members at the holding position from the upper position to the lower position while rotating, and pushing the object to be held into the ground while rotating the object to be held by the plurality of chuck members;
A third step of moving the plurality of chuck members to the release position at the lower position and releasing the plurality of chuck members from holding the object to be held;
A rotary press-fitting step,
Before the rotational press-fitting step, a reduced diameter member attaching step of attaching the reduced diameter member to each of the plurality of chuck members,
In the interval of the rotation press-fitting step, a reduced diameter member removing step of removing the reduced diameter member from the plurality of chuck members,
After the step of removing the reduced diameter member, a connecting step of connecting the connecting member to one end side of the steel pipe pile,
In the vertical direction, after the large-diameter portion of the connecting portion passes through the upper squeezable section that can be squeezed by the plurality of chuck members at the upper position, before the rotary press-fitting step, the plurality of chuck members A diameter reducing member reattaching step of attaching the diameter reducing member to each of the
After the reduced diameter member reattaching step, in the first step of the rotary press fitting step, the plurality of chuck members to which the plurality of reduced diameter members are respectively attached are moved to the clamping position at the upper position, The small diameter portion of the connecting member connected to the steel pipe pile is sandwiched in the radial direction by the plurality of chuck members to which the plurality of reduced diameter members are attached.

According to the above configuration (1), the large-diameter portion of the connecting member capable of accommodating the engaging portion can be directly held by the chuck member, while the reduced-diameter member is attached to the chuck member, thereby reducing the diameter of the reduced-diameter member. The small-diameter portion of the steel pipe pile and the connecting member can be sandwiched by the chuck member via the chuck member.
Therefore, if the reduced-diameter member is attached to the chuck member in the reduced-diameter member attaching step, the steel pipe pile can be rotationally press-fitted in the rotary press-fitting step.
Then, if the reduced diameter member is removed from the chuck member in the reduced diameter member removing step, the connecting member can be connected to the steel pipe pile in the connecting step without interference between the reduced diameter member and the large diameter portion of the connecting member. .
Further, while the large diameter portion of the connecting member can be directly sandwiched by the chuck member, if the reduced diameter member is attached to the chuck member, the small diameter portion can be sandwiched by the chuck member via the reduced diameter member. After connecting the connecting member to the steel pipe pile in the connecting step, the steel pipe pile connected to the connecting member in the rotary press-fitting step can be rotationally press-fitted below the construction reference plane by using a rotary press-fitting machine.

(2) In some embodiments, in the above configuration (1),
A step of preparing a reinforcing member having a sleeve portion that can be internally fitted to one end side of the steel pipe pile and an extension portion coaxial with the sleeve portion and having the same outer diameter as the steel pipe pile,
It is performed before one end of the steel pipe pile in the vertical direction passes through the upper pinchable section that can be pinched by the plurality of chuck members at the upper position, and a sleeve portion of the reinforcing member is provided at one end side of the steel pipe pile. A reinforcing member mounting process for fitting internally,
This is performed after one end of the steel pipe pile has passed through the upper clampable section in the vertical direction and before passing the lower clampable section, and the sleeve of the reinforcing member is formed from one end side of the steel pipe pile. Removing the reinforcing member to pull out the part,
Before the engaging portion passes through the upper pinchable section in the vertical direction, an interference diameter reducing member removing step of removing the diameter reducing member that may interfere with the engaging portion from the chuck member, Further comprising
After the reinforcing member removing step, the reduced diameter member removing step, the connecting step, and the reduced diameter member reattaching step are performed.

  According to the above configuration (2), one end of the steel pipe pile is reinforced by fitting the sleeve portion of the reinforcing member into one end of the steel pipe pile. As a result, when one end of the steel pipe pile is held by the chuck member, deformation of one end of the steel pipe pile is prevented.

(3) In some embodiments, in the above configuration (2),
When one end of the steel pipe pile is in the middle of the lower pinchable section in the vertical direction, the reinforcing member removing step is performed.

According to the above configuration (3), the reinforcing member removing step is performed when one end of the steel pipe pile is located in the middle of the lower pinchable section that can be pinched by the lower chuck member. That is, the reinforcing member is attached until one end of the steel pipe pile reaches the middle of the lower sandwichable section. For this reason, deformation of one end side of the steel pipe pile can be reliably prevented.
On the other hand, since the steel pipe pile is press-fitted until one end side of the steel pipe pile reaches the middle of the lower pinchable section, when the connecting members are connected, the distance in the vertical direction from the lower position to the small diameter portion of the connecting member is reduced. Can be shorter. Therefore, after connecting the connecting members, it is possible to hold the small diameter portion without holding the large diameter portion of the connecting member. This makes it possible to carry out the step of removing the reinforcing member and the step of reattaching the reduced-diameter member during one interval of the rotary press-fitting step, and it is possible to improve the work efficiency.

(4) In some embodiments, in any one of the configurations (1) to (3),
The connection step is performed before one end of the steel pipe pile passes in the vertical direction through an upper squeezable section that can be squeezed by the plurality of chuck members in the upper position,
The step of reattaching the reduced-diameter member is performed after the large-diameter portion of the connecting member passes through the upper squeezable section in the vertical direction.

  According to the above configuration (4), the connecting member is connected to the steel pipe pile before one end of the steel pipe pile passes through the upper sandwichable section, so that the one end side of the steel pipe pile is covered by the large diameter portion of the connecting member. As a result, one end of the steel pipe pile is reinforced by the large diameter portion of the connecting member, and deformation of one end of the steel pipe pile is prevented.

(5) In some embodiments, in the above configuration (4),
When the large diameter portion is directly pinched by the chuck member in the first step of the rotary press-fitting step, when a boundary between the large diameter portion and the small diameter portion is in the middle of the upper pinchable section, the chuck member and the chuck member Insert a spacer between the small diameter part.

  According to the above configuration (5), the portion including the boundary between the large diameter portion and the small diameter portion can be stably sandwiched by inserting the spacer.

(6) In some embodiments, in any one of the configurations (1) to (5),
Before the small-diameter portion of the connecting member passes in the vertical direction through the upper pinchable section that can be pinched by the plurality of chuck members in the upper position, an extension member having the same outer diameter as the steel pipe pile is provided in the small-diameter portion. The method further includes an extension member connecting step of connecting.

  According to the above configuration (6), one end of the steel pipe pile can be press-fitted to a desired depth by performing the rotary press-fitting step with the extension members connected.

(7) In some embodiments, in any one of the above configurations (1) to (6),
After the rotary press-fitting step, a step of connecting a connecting rod having a smaller diameter than the steel pipe pile to the small-diameter portion or the extending member of the connecting member,
A step of pulling up the connecting rod while rotating the connecting rod around the vertical axis, releasing the engagement with the engaging portion of the steel pipe pile, and pulling up the connecting member;
Is further provided.

  According to the above configuration (7), by connecting the connecting rod having a smaller diameter than the steel pipe pile and pulling up the connecting member while rotating the connecting rod, the connecting member can be reliably pulled out without using a rotary press-fitting machine. Can be.

(8) The steel pipe pile burying system according to at least one embodiment of the present invention includes:
A steel pipe pile burying system for burying a steel pipe pile having an engagement portion protruding from an outer peripheral surface on one end side in an axial direction below a construction reference plane,
A connection having a large diameter portion engageable with the engagement portion and externally fitted to one end of the steel pipe pile, and a small diameter portion coaxial with the large diameter portion and having an outer diameter smaller than the large diameter portion. Components,
A rotary press-fitting machine, and a plurality of chuck members arranged around a rotation axis along a vertical direction, between a lower position above the construction reference plane and an upper position above the lower position. An up-down movement mechanism configured to reciprocate the plurality of chuck members in the vertical direction, a rotation mechanism configured to rotate the plurality of chuck members around the rotation axis, and the rotation shaft A rotary press-fitting machine including: a chuck mechanism configured to move the plurality of chuck members between a clamping position and a release position outside the clamping position in a radial direction intersecting with the chucking mechanism;
A plurality of reduced diameter members that can be attached to the inside of the plurality of chuck members in the radial direction, wherein the plurality of chuck members at the holding position can directly hold a large diameter portion of the connection member. On the other hand, a plurality of reduced diameter members that allow the plurality of chuck members at the holding position to clamp the steel pipe pile through the plurality of reduced diameter members,
Is provided.

According to the above configuration (8), the large diameter portion of the connecting member capable of accommodating the engagement portion can be directly held by the chuck member, while the reduced diameter member is attached to the chuck member, so that the chuck member can be connected to the large diameter portion. Thus, the small diameter portion of the steel pipe pile and the connecting member can be sandwiched by the chuck member.
Therefore, if the reduced diameter member is attached to the chuck member, it is possible to rotationally press-fit the steel pipe pile with the chuck member.
If the reduced diameter member is removed from the chuck member, the connection member can be connected to the steel pipe pile without interference between the reduced diameter member and the large diameter portion of the connection member.
Further, while the large diameter portion of the connecting member can be directly sandwiched by the chuck member, if the reduced diameter member is attached to the chuck member, the small diameter portion can be sandwiched by the chuck member via the reduced diameter member. After connecting the connecting member to the steel pipe pile, the steel pipe pile connected with the connecting member can be rotationally press-fitted below the construction reference plane using a rotary press machine.

(9) In some embodiments, in the above configuration (8),
Each of the plurality of reduced-diameter members,
For each of the plurality of chuck members, a main body disposed inside in the radial direction,
Having an arm portion that can be arranged on each of the plurality of chuck members,
The arm portion can be fixed to the chuck member using a fastening member.

  According to the configuration (9), since the diameter reducing member has the arm portion that can be arranged on the upper portion of the chuck member, and the arm portion can be fixed to the chuck member by the fastening member. The members can be easily attached and detached.

(10) In some embodiments, in the above configuration (8) or (9),
In the vertical direction, a stroke length of the chuck member between the upper position and the lower position by the vertical movement mechanism is longer than a length of the diameter reducing member.

  According to the above configuration (10), since the stroke length of the chuck member by the vertical movement mechanism is longer than the length of the diameter reducing member, if the diameter reducing member is attached to and detached from the chuck member at the upper position, the diameter reduction member becomes a steel pipe. Interference with a stake or a connecting member can be reliably avoided.

(11) In some embodiments, in any one of the configurations (8) to (10),
One of the main body and the chuck member has at least one ridge extending along the vertical direction,
The other of the main body and the chuck member extends along the vertical direction, and has at least one groove in which the at least one ridge can be fitted.

  According to the configuration (11), the relative displacement of the reduced diameter member with respect to the chuck member in the rotation direction can be restricted by fitting the protrusion and the groove. As a result, the chuck member can securely clamp the small-diameter portion of the steel pipe pile or the connecting member via the reduced-diameter member.

  According to at least one embodiment of the present invention, even if the engaging portion engageable with the connecting member protrudes from the outer peripheral surface of the steel pipe pile, the connecting member is connected to the steel pipe pile to make the steel pipe pile more than the construction reference plane. A steel pipe pile burying method and a steel pipe pile burying system that can be rotationally press-fitted by using a rotary press machine below.

It is a figure for explaining an example of composition of a cast-in-place steel pipe concrete pile. It is a figure showing roughly composition of a rotary press machine. It is a figure for explaining movement of a chuck member of a rotary press machine. It is a perspective view which shows roughly the chuck member in the state to which the diameter reduction member was attached. FIG. 4 is a schematic perspective view showing a reduced diameter member and a chuck member separately. It is a figure for explaining movement of a chuck member in the state where a diameter reduction member was attached. It is a perspective view which shows a connection member with a steel pipe pile schematically. It is a perspective view which shows an extension member with a connection member schematically. FIG. 4 is a schematic side view of a connection member according to some embodiments. It is a perspective view which shows the reinforcement member with one end side of a steel pipe pile schematically. It is a flowchart which shows the schematic procedure of the construction method of a cast-in-place steel pipe concrete pile. It is a flow chart which shows roughly the procedure of the steel pipe pile embedding method concerning one embodiment of the present invention. It is a flow chart which shows roughly the procedure of the steel pipe pile embedding method concerning one embodiment of the present invention. It is a flowchart explaining the schematic procedure of a rotary press-fitting process. It is a figure for explaining a rotation press fit process. It is a figure for explaining an interference diameter reduction member removal process. It is a figure for explaining a reinforcing member attaching process. It is a figure for explaining a reinforcement member removal process and a diameter reduction member removal process. It is a figure for explaining a rotation press fit process. It is a figure for explaining an extension member attachment process. It is a figure for explaining a connecting rod attaching process. It is a figure for explaining a connection member extraction process. It is a flow chart which shows a schematic procedure of a steel pipe pile burial process concerning other embodiments. It is a figure for explaining a connection process. It is a figure for explaining a spacer used when sandwiching a boundary of a large diameter part and a small diameter part of a connecting member.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Absent.
For example, expressions representing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly described. In addition to such an arrangement, it is also possible to represent a state of being relatively displaced with a tolerance or an angle or a distance at which the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which indicate that things are in the same state, not only represent strictly equal states, but also have a tolerance or a difference that provides the same function. An existing state shall also be represented.
For example, an expression representing a shape such as a square shape or a cylindrical shape not only represents a shape such as a square shape or a cylindrical shape in a strictly geometrical sense, but also an uneven portion or a chamfer within a range where the same effect can be obtained. A shape including a part and the like is also represented.
On the other hand, the expression “comprising”, “comprising”, “including”, “including”, or “having” one component is not an exclusive expression excluding the existence of another component.

Drawing 1 is a figure for explaining an example of composition of a cast-in-place steel pipe concrete pile. As shown in FIG. 1, the cast-in-place steel pipe concrete pile 1 is provided in a hole 4 opening to the construction reference plane 2. The hole 4 has, for example, a shaft portion 6 and an enlarged bottom portion 8, and a steel pipe pile 10 is arranged at least above the shaft portion 6. The upper end of the steel pipe pile 10 is located below the construction reference plane 2. Inside the hole 4, rebar cage 12 is disposed on the lower side even without low. The inside of the hole 4 is filled with concrete 14 up to the upper end of the steel pipe pile 10. The concrete 14, the reinforcing cage 12, and the steel pipe pile 10 are integrated to form the cast-in-place steel pipe concrete pile 1.
In addition, the hole 4 does not need to have the expanded bottom part 8.

A steel pipe pile burying system according to at least one embodiment of the present invention includes a rotary press-fitting machine, a reduced diameter member, and a connecting member.
FIG. 2 schematically shows the configuration of the rotary press-fitting machine. As shown in FIG. 2, the rotary press-fitting machine 20 includes a plurality of chuck members 22, a vertical movement mechanism 24, a rotation mechanism 26, and a chuck mechanism 28. The plurality of chuck members 22 are arranged around a rotation axis A along the vertical direction.

  The vertical movement mechanism 24 vertically reciprocates the plurality of chuck members 22 between a lower position preset above the construction reference plane 2 and an upper position preset above the lower position. It is configured to be. For example, the vertical movement mechanism 24 includes a lower frame 30 that is horizontally installed on the construction reference surface 2, an upper frame 31 that is disposed in parallel above the lower frame 30, and a space between the lower frame 30 and the upper frame 31. Are constituted by a plurality of hydraulic cylinders 32 arranged at the same time. By expanding and contracting the hydraulic cylinder 32, the upper frame 31 moves up and down, whereby the plurality of chuck members 22 move up and down.

The rotation mechanism 26 is configured to rotate the plurality of chuck members 22 around the rotation axis A. The rotation mechanism 26 includes, for example, a hydraulic motor 33, a gear 34, and swing bearings 35 and 36.
The chuck mechanism 28 is configured to move the plurality of chuck members 22 between a holding position and a release position outside the holding position in a radial direction intersecting the rotation axis A. The chuck mechanism 28 is, for example, disposed on the intermediate frame 37 disposed in parallel with the upper frame 31, a plurality of hydraulic cylinders 38 disposed between the upper frame 31 and the intermediate frame 37, and disposed on the intermediate frame 37. It is constituted by a wedge member 39.
The slewing bearing 35 is fixed to the upper frame 31, and the slewing bearing 36 is fixed to the intermediate frame 37.

  Here, FIG. 3 is a diagram for explaining the movement of the chuck member 22 of the rotary press-fitting machine 20. The chuck member 22 has a plate shape, and is swingably suspended from an inner ring 40 of the swing bearing 35 via a link 41. On the other hand, the wedge member 39 is provided on the inner ring 42 of the swing bearing 36. When the hydraulic cylinder 38 expands and contracts, the distance between the upper frame 31 and the intermediate frame 37, that is, the distance between the inner ring 40 of the slewing bearing 35 and the inner ring 42 of the slewing bearing 36 changes, and accordingly, the wedge member 39 moves up and down. . As the wedge member 39 moves upward, the plurality of chuck members 22 move to the radially inner gripping position. Conversely, as the wedge member 39 moves downward, the plurality of chuck members 22 Move to the radially outward release position.

FIG. 4 is a perspective view schematically showing the chuck member with the reduced diameter member attached. FIG. 5 is a schematic perspective view showing the reduced diameter member and the chuck member separately. FIG. 6 is a diagram for explaining the movement of the chuck member in a state where the reduced diameter member is attached.
As shown in FIGS. 4 and 5, the reduced diameter member 45 can be attached radially inward to each of the plurality of chuck members 22. Then, as shown in FIG. 6, the plurality of chuck members 22 at the holding position can hold the steel pipe pile 10 via the plurality of reduced diameter members 45 attached to each. On the other hand, as shown in FIG. 3, the plurality of chuck members 22 at the holding position can directly hold the large diameter portion 52 of the connecting member 50 described later.

FIG. 7 is a perspective view schematically showing a connecting member together with a steel pipe pile. As shown in FIG. 7, the steel pipe pile 10 has at least one engaging portion 11 protruding from the outer peripheral surface at one end side.
The connecting member 50 is made of, for example, steel, and has a large-diameter portion 52 and a small-diameter portion 54 as shown in FIG. The large diameter portion 52 has an outer diameter larger than the outer diameter of the steel pipe pile 10, and can be fitted to one end of the steel pipe pile 10. The large diameter portion 52 is capable of engaging with the engaging portion 11 of the steel pipe pile 10 and is capable of accommodating the engaging portion 11. For example, the large diameter portion 52 has a T-shaped groove 53 connected to one end of the large diameter portion 52, and the engaging portion 11 can be accommodated in the groove 53. The small diameter portion 54 is coaxially connected to the large diameter portion 52 and has the same outer diameter as the steel pipe pile 10. Note that the same outer diameter is the same in the following, but it is not necessary to have exactly the same outer diameter, and it is sufficient if the outer diameter is substantially the same.

According to the above configuration, while the large-diameter portion 52 of the connecting member 50 that can accommodate the engaging portion 11 can be directly pinched by the chuck member 22, the contraction member 45 is attached to the chuck member 22 to reduce the diameter. The steel pipe pile 10 and the small diameter portion 54 of the connecting member 50 can be sandwiched by the chuck member 22 via the diameter member 45.
Therefore, if the reduced diameter member 45 is attached to the chuck member 22, the steel tube pile 10 can be rotationally press-fitted by the chuck member 22.
Then, if the reduced diameter member 45 is removed from the chuck member 22, the connection member 50 can be connected to the steel pipe pile 10 without interference between the reduced diameter member 45 and the large diameter portion 52 of the connection member 50.

  Further, while the large-diameter portion 52 of the connecting member 50 can be directly clamped by the chuck member 22, if the reduced-diameter member 45 is attached to the chuck member 22, the small-diameter portion 54 is Since the connecting member 50 is connected to the steel pipe pile 10, the steel pipe pile 10 to which the connecting member 50 is connected can be rotationally press-fitted below the construction reference plane 2 using the rotary press-fitting machine 20. .

  In some embodiments, as shown in FIGS. 4 and 5, each of the plurality of reduced diameter members 45 has a main body 46 and an arm 47. The main body 46 has, for example, a plate shape and is arranged inside the chuck member 22 in the radial direction. The arm part 47 is provided integrally with the main body part 46 and is arranged above the chuck member 22. The arm portion 47 can be fixed to the chuck member 22 using the fastening member 48, whereby the reduced diameter member 45 can be fixed to the chuck member 22.

  In the above configuration, the reduced diameter member 45 has the arm portion 47 that can be disposed above the chuck member 22, and the arm portion 47 can be fixed to the chuck member 22 by the fastening member 48. The reduced diameter member 45 can be easily attached and detached.

  In some embodiments, fastening member 48 is a bolt that is screwed vertically. In this configuration, the reduced diameter member 45 can be easily attached to and detached from the chuck member 22 by rotating the bolt around the vertical axis.

In some embodiments, the stroke length Ls (see FIG. 2) of the chuck member 22 between the upper position and the lower position by the vertical movement mechanism 24 in the vertical direction is equal to the length Lr (see FIG. 2). 6).
According to the above configuration, since the stroke length Ls of the chuck member 22 by the vertical movement mechanism 24 is longer than the length Lr of the reduced diameter member 45, if the reduced diameter member 45 is attached to and detached from the chuck member 22 at the upper position, It is possible to reliably prevent the reduced diameter member 45 from interfering with the steel pipe pile 10 and the connecting member 50.

In some embodiments, as shown in FIG. 5, one of the main body portion 46 of the reduced diameter member 45 and the chuck member 22 has at least one ridge 49 extending along the vertical direction, and the other has the other. , Has at least one groove 23 which extends along the vertical direction and into which at least one ridge 49 can be fitted. Note that the groove 23 need not be provided.
In the above configuration, the relative displacement of the diameter reducing member 45 with respect to the chuck member 22 in the rotation direction can be restricted by fitting the ridge 49 and the groove 23. As a result, the chuck member 22 can reliably clamp the steel pipe pile 10 and the small diameter portion 54 of the connecting member 50 via the reduced diameter member 45.

In some embodiments, the steel pipe pile embedding system further includes an extension member. FIG. 8 is a perspective view schematically showing an extension member together with a connection member. The extension member 60 is made of, for example, steel, and can be connected to the small-diameter portion 54 of the connecting member 50, and has the same outer diameter as the small-diameter portion 54, as shown in FIG.
According to the above configuration, by connecting the extension member 60 to the connection member 50, one end of the steel pipe pile 10 can be press-fitted to a desired depth.

  In some embodiments, the steel pipe pile burial system further comprises a connecting rod. 7 and 8 schematically show a connecting rod together with other members. The connecting rod 62 is made of, for example, steel, and can be connected to the small-diameter portion 54 or the extension member 60 of the connecting member 50 as shown in FIGS. 7 and 8, from the small-diameter portion 54 of the connecting member 50 and the steel pipe pile 10. Is also small in diameter.

  According to the above configuration, by connecting the connecting rod 62 having a smaller diameter than the steel pipe pile 10 and pulling up the connecting member 50 while rotating the connecting rod 62 with a pile driver, for example, without using the rotary press-fitting machine 20, The connecting member 50 can be reliably pulled out.

In some embodiments, as shown in FIGS. 7 and 8, the connecting rod 62 is connected to the connecting member 50 or the extension member 60 via the lid member 64.
In some embodiments, as shown in FIGS. 7 and 8, the connecting member 50 and the lid member 64, the connecting member 50 and the extending member 60, or the extending member 60 and the lid member 64 are connected by an intaglio joint. You. As shown in FIGS. 7 and 8, positioning projections and projections are provided between the connecting member 50 and the lid member 64, between the connecting member 50 and the extending member 60, or between the extending member 60 and the lid member 64. A receiving recess is provided, and the inro joint is fastened by a bolt (not shown).

  FIG. 9 is a schematic side view of a connection member 50 according to some embodiments. In some embodiments, as shown in FIG. 9, the coupling member 50 has a bit 55 at the end of the large diameter portion 52 opposite the small diameter portion 54.

  When the large-diameter portion 52 of the connecting member 50 is larger in diameter than the steel pipe pile 10, it may be difficult to rotationally press-fit the large-diameter portion 52 of the connecting member 50 into the ground depending on the geology. In this regard, according to the above configuration, by providing the bit 55 at the end of the large diameter portion 52 of the connecting member 50, even if the large diameter portion 52 of the connecting member 50 is larger in diameter than the steel pipe pile 10, The large diameter portion 52 of the connecting member 50 can be rotationally pressed into the ground.

In some embodiments, the steel pipe pile embedding system further comprises a reinforcing member. FIG. 10 is a perspective view schematically showing a reinforcing member together with one end side of the steel pipe pile. The reinforcing member 66 is made of, for example, steel. As shown in FIG. 10, as shown in FIG. Extending portion 68.
In the above configuration, one end of the steel pipe pile 10 is reinforced by fitting the sleeve 67 of the reinforcing member 66 into one end of the steel pipe pile 10. As a result, when one end of the steel pipe pile 10 is clamped by the chuck member 22, deformation of one end of the steel pipe pile 10 is prevented.

  In some embodiments, the reinforcement member 66 has a T-shaped groove 69 in the sleeve portion 67 as shown in FIG. The groove 69 can engage with the engaging portion when the engaging portion is provided on the inner peripheral surface of the steel pipe pile 10. That is, when the engaging portion is provided on the inner peripheral surface of the steel pipe pile 10, the reinforcing member 66 can be used as a connecting member.

  FIG. 11 is a flowchart showing a schematic procedure of a method of constructing a cast-in-place steel pipe concrete pile (hereinafter, also simply referred to as a pile construction method). As shown in FIG. 11, the pile construction method includes a steel pipe pile embedding process S100 and S200 for embedding the steel pipe pile 10 in the ground, a hole excavation process S2 for excavating the hole 4, and a reinforcing cage 12 in the hole 4. It has a reinforcing bar disposing step S3 for disposing and a ready-mixed concrete supplying step S4 for supplying ready-mixed concrete into the hole 4.

  FIG. 12 and FIG. 13 are flowcharts schematically showing the procedure of the steel pipe pile embedding method (steel pipe pile embedding step) according to one embodiment of the present invention. First, as shown in FIG. 12, the steel pipe pile burying method includes a step of preparing the connecting member 50 and the rotary press-fitting machine 20. The steel pipe pile embedding method includes a reduced diameter member attaching step S101 for attaching the reduced diameter member 45 to all the chuck members 22. After the reduced diameter member attaching step S101, a rotary press-fitting step S102 is performed.

FIG. 14 is a flowchart illustrating a schematic procedure of the rotary press-fitting step. FIG. 15 is a diagram for explaining the rotary press-fitting step.
As shown in FIG. 14, the rotary press-fitting step S102 has a first step S300, a second step S302, and a third step S304. As shown by the two-dot chain line in FIG. 15, in the first step S300, the plurality of chuck members 22 are moved to the clamping position at the upper position, and the object existing in the upper clamping section by the plurality of chuck members 22 is removed. Pinching in the radial direction.
Note that FIG. 15 shows a hammer grave 70 as an excavator together with the steel pipe pile 10. The hole excavation step S2 can be performed in parallel with the steel pipe pile embedding step S100 by using the hammer grave 70.

In the second step S302, the plurality of chuck members 22 at the holding position are moved from the upper position to the lower position while rotating, and the object to be held is pushed into the ground by the plurality of chuck members 22 while rotating.
In the third step S304, the plurality of chuck members 22 are moved to the release position at the lower position, and the holding of the object to be held by the plurality of chuck members 22 is released.

After the rotary press-fitting step S102, a determining step S104 for determining whether or not the engaging portion 11 of the steel pipe pile 10 has entered the upper pinchable section is executed. Until the determination result of the determination step S104 becomes a positive result, the rotary press-fitting step S102 is repeated, and the steel pipe pile 10 is pushed into the ground.
If the determination result in the determination step S104 is affirmative, the interference reduction member removing step S106 and the reinforcing member attaching step S108 are performed in the interval between the rotational press-fitting steps S102 and S110. FIG. 16 is a diagram for explaining the interference reducing member removing step. As shown in FIG. 16, in the interference reduced diameter member removing step S106, only the reduced diameter member 45 that interferes with the engaging portion 11 is removed.

  After the interference reducing member removing step S106, a reinforcing member attaching step S108 is executed. FIG. 17 is a diagram for explaining the reinforcing member attaching step S108. As shown in FIG. 17, in the reinforcing member mounting step S108, the reinforcing member 66 is mounted on the upper end side of the steel pipe pile 10.

After the reinforcing member attaching step S108, a rotational press-fitting step S110 is executed. The operation of the rotary press-fitting step S110 is the same as that of the rotary press-fitting step S102. The object to be clamped is the steel pipe pile 10 also in the rotary press-fitting step S110.
After the rotary press-fitting step S110, a determining step S112 for determining whether or not the upper end of the steel pipe pile 10 has entered the lower pinchable section is performed. Until the determination result of the determination step S112 becomes a positive result, the rotary press-fitting step S110 is repeated, and the steel pipe pile 10 is pushed into the ground.

  If the determination result in the determination step S110 is affirmative, the reinforcing member removal step S113, the reduced diameter member removal step S114, the connection step S116, and the reduced diameter member reattachment step S118 are executed in the interval between the rotational press-fitting steps S110 and S120. Is done.

FIG. 18 is a diagram for explaining the reinforcing member removing step and the diameter reducing member removing step. As shown in FIG. 18, the reinforcing member 66 is removed in the reinforcing member removing step S113, and all the reduced diameter members 45 are removed from the chuck member 22 in the reduced diameter member removing step S114.
Ligation step S116 is performed after the reinforcing member dismounting step S113 and reduced-diameter member dismounting step S11 4, the connecting step S116, the connecting member 50 is attached to the upper end of the steel pipe pile 10.
After the connecting step S116, a reduced diameter member reattaching step S118 is performed, and the reduced diameter members 45 are attached to all the chuck members 22 at the upper position.

  The rotational press-fitting step S120 is performed after the diameter reducing member reattaching step S118. FIG. 19 is a view for explaining the rotary press-fitting step. As shown in FIG. 19, in the first step S300 of the rotary press-fitting step S120 after the diameter reducing member reattachment step S118, the plurality of chuck members 22 to which the plurality of diameter reducing members 45 are respectively attached are moved to the upper position. To the pinch position. Thus, the small-diameter portion 54 of the connecting member 50 connected to the steel pipe pile 10 is sandwiched by the plurality of chuck members 22 to which the plurality of reduced-diameter members 45 are attached.

  According to the above configuration, while the large-diameter portion 52 of the connecting member 50 capable of housing the engagement portion 11 can be directly sandwiched by the chuck member 22, the diameter-reducing member 45 is attached to the chuck member 22 to reduce the diameter. The steel pipe pile 10 and the small-diameter portion 54 of the connecting member 50 can be sandwiched by the chuck member 22 via the member 45.

Therefore, if the reduced diameter member 45 is attached to the chuck member 22 in the reduced diameter member attaching step S101, the steel pipe pile 10 can be rotationally press-fitted in the rotary press fitting step S102.
Then, if the reduced diameter member 45 is removed from the chuck member 22 in the reduced diameter member removing step S114, the reduced diameter member 45 and the large diameter portion 52 of the connecting member 50 do not interfere with each other, and the steel pipe pile 10 is connected in the connecting step S116. The connecting member 50 can be connected.

  Further, while the large-diameter portion 52 of the connecting member 50 can be directly clamped by the chuck member 22, if the reduced-diameter member 45 is attached to the chuck member 22, the small-diameter portion 54 is Since the connecting member 50 is connected to the steel pipe pile 10 in the connecting step S116, the steel pipe pile 10 to which the connecting member 50 is connected in the rotary press-fitting step S120 is rotated below the construction reference plane 2 by a rotary press machine. 20 can be rotationally press-fitted.

  Further, in the above configuration, the sleeve portion 67 of the reinforcing member 66 is internally fitted to one end side of the steel pipe pile 10 to reinforce one end side of the steel pipe pile 10. As a result, when one end of the steel pipe pile 10 is clamped by the chuck member 22, deformation of one end of the steel pipe pile 10 is prevented.

Further, in the above configuration, the reinforcing member removing step S113 is performed when one end of the steel pipe pile 10 is located in the middle of the lower sandwichable section in the vertical direction. That is, the reinforcing member 66 is attached until one end of the steel pipe pile 10 reaches the middle of the lower pinchable section. For this reason, the deformation of one end side of the steel pipe pile 10 can be reliably prevented.
On the other hand, since the steel pipe pile 10 is press-fitted until one end of the steel pipe pile 10 reaches the middle of the lower pinchable section, when the connecting member 50 is connected, the vertical from the lower position to the small diameter portion 54 of the connecting member 50 is obtained. The distance in the direction can be shortened. For this reason, after connecting the connecting member 50, it is possible to hold the small diameter portion 54 without holding the large diameter portion 52 of the connecting member 50. This makes it possible to perform the reinforcing member removing step S113 and the diameter reducing member reattaching step S118 during one interval of the rotational press-fitting steps S110 and S120, and it is possible to improve work efficiency. .

  In some embodiments, when pinching one end of the steel pipe pile 10, as shown in FIG. 17, the steel pipe pile 10 and the extension 68 of the reinforcing member 66 are clamped in half. Thereby, deformation of one end side of the steel pipe pile 10 is reliably prevented.

  In some embodiments, the steel pipe pile embedding method further includes, after the rotary press-fitting step S120, a determining step S122 of determining whether or not the upper end side of the connecting member 50 has entered the upper squeezable section. The rotational press-fitting step S120 is performed until the result of the determination step S122 is affirmative. The operation of the rotary press-fitting step S120 is the same as that of the rotary press-fitting step S102.

  If the determination result in the determination step S122 is affirmative, the extension member attaching step S124 is performed in the interval between the rotary press-fitting steps S120 and S126. FIG. 20 is a diagram for explaining the extension member attaching step. As shown in FIG. 20, in the extension member attaching step S124, before the small diameter portion 54 of the connecting member 50 passes through the upper squeezable section in the vertical direction, the small diameter portion 54 has the same outer diameter as the steel pipe pile 10 extended. The member 60 is connected.

Then, after the extension member attaching step S124, the rotary press fitting step S126 is executed. The operation of the rotary press-fitting step S126 is the same as that of the rotary press-fitting step S102, but the object to be clamped is the extension member 60.
According to the above configuration, by executing the rotary press-fitting step S126 with the extension member 60 connected, one end of the steel pipe pile 10 can be press-fitted to a desired depth.

In some embodiments, the steel pipe pile embedding method includes a connecting rod attaching step S130 after the rotary press-fitting steps S120 and S126. FIG. 21 is a diagram for explaining the connecting rod attaching step. As shown in FIG. 21, in the connecting rod attaching step S <b> 130, the connecting rod 62 having a smaller diameter than the steel pipe pile 10 is connected to the small diameter portion 54 or the extension member 60 of the connecting member 50.
Then, after the connecting rod attaching step S130, a connecting member extracting step S132 is performed. FIG. 22 is a diagram for explaining the connecting member extracting step. As shown in FIG. 22, in the connecting member withdrawing step S132, the connecting rod 62 is pulled up while rotating about the rotation axis A, and disengaged from the engaging portion 11 of the steel pipe pile 10 to disconnect the connecting member 50. Pull up.

  According to the above configuration, by connecting the connecting rod 62 having a smaller diameter than the steel pipe pile 10 and pulling up the connecting member 50 while rotating the connecting rod 62, the connecting member 50 can be securely connected without using the rotary press-fitting machine 20. Can be pulled out.

  FIG. 23 is a flowchart illustrating a schematic procedure of a steel pipe pile embedding process according to another embodiment. As shown in FIG. 23, the steel pipe pile embedding step S200 includes a reduced diameter member mounting step S201, a rotary press fitting step S202, and a determination step S204. These include a reduced diameter member mounting step S101 of the steel pipe pile embedding step S100, This is the same as the rotational press-fitting step S102 and the determination step S104.

In the steel pipe pile embedding step S200, if the result of the determination step S204 is affirmative, the reduced diameter member removing step S206 and the connecting step S208 are performed at intervals of the rotary press fitting steps S202 and S210. In the reduced diameter member removing step S206, the reduced diameter members 45 are removed from all the chuck members 22.
FIG. 24 is a diagram for explaining the connection step. The connecting step S208 is performed after the diameter reducing member removing step S206, and the connecting member 50 is attached to the steel pipe pile 10 as shown in FIG.

After the connecting step S208, a rotational press-fitting step S210 is performed. The operation of the rotary press-fitting step S210 is the same as the operation of the rotary press-fitting step S102.
After the rotation press-fitting step S210, a determining step S212 for determining whether or not the boundary between the large-diameter portion 52 and the small-diameter portion 54 has passed the upper sandwichable section is performed. The rotational press-fitting step S210 is repeated until the result of the determination step S212 is affirmative. If the result of the determination in step S212 is affirmative, a diameter reducing member reattaching step S214 is executed. The diameter reducing member reattaching step S214 is the same as the diameter reducing member reattaching step S118, and the diameter reducing members 45 are attached to all the chuck members 22 in the diameter reducing member reattaching step S214. The steps after the diameter reducing member reattaching step S214 in the steel pipe pile embedding step S200 are the same as the steel pipe pile embedding step S100.

  In the above configuration, in the connecting step S208, the connecting member 50 is connected to the steel pipe pile 10 before one end of the steel pipe pile 10 passes through the upper pinchable section, so that the large-diameter portion 52 of the connecting member 50 allows the steel pipe pile 10 Is covered at one end. As a result, one end of the steel pipe pile 10 is reinforced by the large diameter portion 52 of the connecting member 50, and deformation of one end of the steel pipe pile 10 is prevented.

In some embodiments, when the large-diameter portion 52 is directly clamped by the chuck member 22 in the first step S300 of the rotary press-fitting step S210, the boundary between the large-diameter portion 52 and the small-diameter portion 54 is located in the middle of the upper clampable section. At this time, as shown in FIG. 25, the spacer 72 is inserted between the chuck member 22 and the small diameter portion 54.
According to the above configuration, by inserting the spacer 72, a portion including the boundary between the large diameter portion 52 and the small diameter portion 54 can be stably held.

Lastly, the present invention is not limited to the above-described several embodiments, but also includes a form in which the above-described embodiment is modified and a form in which these forms are appropriately combined.
For example, the chuck mechanism 28 is not limited to the configuration described above, and may adopt a configuration in which the chuck member is reciprocated more directly by the hydraulic cylinder.

DESCRIPTION OF SYMBOLS 1 Cast-in-place steel pipe concrete pile 2 Construction reference plane 4 Hole 6 Shaft part 8 Expanded bottom part 10 Steel pipe pile 11 Engagement part 12 Reinforced basket 14 Concrete 20 Rotary press-fitting machine 22 Chuck member 23 Groove 24 Vertical movement mechanism 26 Rotary mechanism 28 Chuck mechanism 30 Lower frame 31 Upper frame 32 Hydraulic cylinder 33 Hydraulic motor 34 Gear 35 Slewing bearing 36 Slewing bearing 37 Intermediate frame 38 Hydraulic cylinder 39 Wedge member 40 Inner ring 41 Link 42 Inner ring 45 Reduced diameter member 46 Main body part 47 Arm part 48 Fastening member 49 Protrusion 50 Connecting member 52 Large diameter portion 53 Groove 54 Small diameter portion 55 Bit 60 Extension member 62 Connection rod 64 Cover member 66 Reinforcement member 67 Sleeve portion 68 Extension portion 69 Groove 70 Hammagrub 72 Spacer

Claims (11)

A steel pipe pile embedding method of embedding a steel pipe pile having an engagement portion protruding from an outer peripheral surface at one end side in an axial direction below a construction reference plane,
A large-diameter portion capable of accommodating the engagement portion and being engageable with the engagement portion and being externally fitted to one end of the steel pipe pile; and the steel pipe pile being coaxial with the large-diameter portion. Preparing a connecting member having a small diameter portion having the same outer diameter as;
A plurality of chuck members arranged around a rotation axis along a vertical direction, the plurality of chucks in the vertical direction between a lower position above the construction reference plane and an upper position above the lower position; A vertical movement mechanism configured to reciprocate a member, a rotation mechanism configured to rotate the plurality of chuck members around the rotation axis, and a clamping position in a radial direction intersecting the rotation axis And preparing a rotary press-fitting machine including a chuck mechanism configured to move the plurality of chuck members between a release position outside of the holding position.
A plurality of reduced diameter members that can be attached to the inside of the plurality of chuck members in the radial direction, wherein the plurality of chuck members at the holding position can directly hold a large diameter portion of the connection member. Meanwhile, a step of preparing a plurality of reduced diameter members that allow the plurality of chuck members at the holding position to clamp the steel pipe pile via the plurality of reduced diameter members,
A rotary press-fitting step repeatedly performed by the rotary press-fitting machine, wherein each of the rotary press-fitting steps includes:
A first step of moving the plurality of chuck members to the holding position at the upper position, and holding the object to be held in the radial direction by the plurality of chuck members;
A second step of moving the plurality of chuck members at the holding position from the upper position to the lower position while rotating, and pushing the object to be held into the ground while rotating the object to be held by the plurality of chuck members;
A third step of moving the plurality of chuck members to the release position at the lower position and releasing the plurality of chuck members from holding the object to be held;
A rotary press-fitting step,
Before the rotational press-fitting step, a reduced diameter member attaching step of attaching the reduced diameter member to each of the plurality of chuck members,
In the interval of the rotation press-fitting step, a reduced diameter member removing step of removing the reduced diameter member from the plurality of chuck members,
After the step of removing the reduced diameter member, a connecting step of connecting the connecting member to one end side of the steel pipe pile,
In the vertical direction, after the large-diameter portion of the connecting portion passes through the upper squeezable section that can be squeezed by the plurality of chuck members at the upper position, before the rotary press-fitting step, the plurality of chuck members A diameter reducing member reattaching step of attaching the diameter reducing member to each of the
The chuck mechanism has a wedge member that moves the plurality of chuck members in the radial direction by sliding outward in the radial direction with respect to the plurality of chuck members suspended via a link,
Each of the plurality of reduced-diameter members,
For each of the plurality of chuck members, a main body disposed inside in the radial direction,
Having an arm portion that can be arranged on each of the plurality of chuck members,
In each of the plurality of reduced diameter members, only the arm portion can be fixed to the chuck member using a fastening member,
After the reduced diameter member reattaching step, in the first step of the rotary press fitting step, the plurality of chuck members to which the plurality of reduced diameter members are respectively attached are moved to the clamping position at the upper position, A method for burying a steel pipe pile, characterized in that a small diameter portion of the connecting member connected to the steel pipe pile is sandwiched in the radial direction by the plurality of chuck members to which a plurality of reduced diameter members are attached, respectively. A steel pipe pile embedding method of embedding a steel pipe pile having an engagement portion protruding from an outer peripheral surface at one end side in an axial direction below a construction reference plane,
A large-diameter portion capable of accommodating the engagement portion and being engageable with the engagement portion and being externally fitted to one end of the steel pipe pile; and the steel pipe pile being coaxial with the large-diameter portion. Preparing a connecting member having a small diameter portion having the same outer diameter as;
A plurality of chuck members arranged around a rotation axis along a vertical direction, the plurality of chucks in the vertical direction between a lower position above the construction reference plane and an upper position above the lower position; A vertical movement mechanism configured to reciprocate a member, a rotation mechanism configured to rotate the plurality of chuck members around the rotation axis, and a clamping position in a radial direction intersecting the rotation axis And preparing a rotary press-fitting machine including a chuck mechanism configured to move the plurality of chuck members between a release position outside of the holding position.
A plurality of reduced diameter members that can be attached to the inside of the plurality of chuck members in the radial direction, wherein the plurality of chuck members at the holding position can directly hold a large diameter portion of the connection member. Meanwhile, a step of preparing a plurality of reduced diameter members that allow the plurality of chuck members at the holding position to clamp the steel pipe pile via the plurality of reduced diameter members,
A step of preparing a reinforcing member having a sleeve portion that can be internally fitted to one end side of the steel pipe pile and an extension portion coaxial with the sleeve portion and having the same outer diameter as the steel pipe pile,
A rotary press-fitting step repeatedly performed by the rotary press-fitting machine, wherein each of the rotary press-fitting steps includes:
A first step of moving the plurality of chuck members to the holding position at the upper position, and holding the object to be held in the radial direction by the plurality of chuck members;
A second step of moving the plurality of chuck members at the holding position from the upper position to the lower position while rotating, and pushing the object to be held into the ground while rotating the object to be held by the plurality of chuck members;
A third step of moving the plurality of chuck members to the release position at the lower position and releasing the plurality of chuck members from holding the object to be held;
A rotary press-fitting step,
Before the rotational press-fitting step, a reduced diameter member attaching step of attaching the reduced diameter member to each of the plurality of chuck members,
Before the engaging portion passes in the vertical direction through the upper squeezable section that can be squeezed by the plurality of chuck members at the upper position, the diameter-reducing member that may interfere with the engaging portion is removed. An interference reduced diameter member removing step of removing from the chuck member,
Occurs before the end of the steel pipe pile in front SL on Gawakyoji possible interval in the vertical direction to pass through, the reinforcing member mounting step of fitting an inner sleeve portion of the reinforcing member to one end of the steel pipe pile,
This is performed after one end of the steel pipe pile has passed through the upper clampable section in the vertical direction and before passing the lower clampable section, and the sleeve of the reinforcing member is provided from one end side of the steel pipe pile. Removing the reinforcing member to pull out the part,
After the reinforcing member dismounting step, the reduced-diameter member dismounting step of removing the reduced-diameter member from the plurality of chuck members,
After the step of removing the reduced diameter member, a connecting step of connecting the connecting member to one end side of the steel pipe pile ,
In the vertical direction, after the large-diameter portion of the connecting portion passes through the upper squeezable section in the rotary press-fitting step, and before the rotary press-fitting step, the diameter reduction of each of the plurality of chuck members is performed. A reduced diameter member reattaching step of attaching the member ,
After the diameter reducing member reattaching step, in the first step of the rotary press-fitting step, the plurality of chuck members to which the plurality of diameter reducing members are respectively attached are moved to the clamping position at the upper position, steel pipe you wherein <br/> be clamped across the small diameter portion of the plurality of reduced-diameter member said coupling member connected with the steel pipe pile by the plurality of chuck members mounted respectively in the radial direction Piling method.   The chuck mechanism has a wedge member that moves the plurality of chuck members in the radial direction by sliding outward in the radial direction with respect to the plurality of chuck members suspended via a link,
  Each of the plurality of reduced-diameter members,
  For each of the plurality of chuck members, a main body disposed inside in the radial direction,
  Having an arm portion that can be arranged on each of the plurality of chuck members,
  In each of the plurality of reduced diameter members, only the arm portion can be fixed to the chuck member using a fastening member.
The method of burying a steel pipe pile according to claim 2, wherein: When the end of the steel pipe pile is in the middle of the lower holding possible interval in the vertical direction, the steel pipe pile burying method according to claim 2 or 3, characterized in that said reinforcing member dismounting step. The connection step is performed before one end of the steel pipe pile passes in the vertical direction through an upper squeezable section that can be squeezed by the plurality of chuck members in the upper position,
The method of burying steel pipe piles according to claim 1, wherein the step of reattaching the reduced diameter member is performed after the large diameter portion of the connecting member has passed through the upper squeezable section in the vertical direction. When the large diameter portion is directly pinched by the chuck member in the first step of the rotary press-fitting step, when a boundary between the large diameter portion and the small diameter portion is in the middle of the upper pinchable section, the chuck member and the chuck member The method of burying a steel pipe pile according to claim 5, wherein a spacer is inserted between the steel pipe pile and the small diameter portion. Before the small-diameter portion of the connecting member passes in the vertical direction through the upper pinchable section that can be pinched by the plurality of chuck members in the upper position, an extension member having the same outer diameter as the steel pipe pile is provided in the small-diameter portion. The method for burying a steel pipe pile according to any one of claims 1 to 6, further comprising an extension member connecting step of connecting. After the rotary press-fitting step, connecting a connecting rod having a smaller diameter than the steel pipe pile to an extension member having the same outer diameter as the steel pipe pile connected to the small diameter section or the small diameter section of the connecting member,
A step of pulling up the connecting rod while rotating the connecting rod around the vertical axis, releasing the engagement with the engaging portion of the steel pipe pile, and pulling up the connecting member;
The method for burying a steel pipe pile according to any one of claims 1 to 7 , further comprising: A steel pipe pile burying system for burying a steel pipe pile having an engagement portion protruding from an outer peripheral surface on one end side in an axial direction below a construction reference plane,
A connection having a large diameter portion engageable with the engagement portion and externally fitted to one end of the steel pipe pile, and a small diameter portion coaxial with the large diameter portion and having an outer diameter smaller than the large diameter portion. Components,
A rotary press-fitting machine, and a plurality of chuck members arranged around a rotation axis along a vertical direction, between a lower position above the construction reference plane and an upper position above the lower position. An up-down movement mechanism configured to reciprocate the plurality of chuck members in the vertical direction, a rotation mechanism configured to rotate the plurality of chuck members around the rotation axis, and the rotation shaft A rotary press-fitting machine including: a chuck mechanism configured to move the plurality of chuck members between a clamping position and a release position outside the clamping position in a radial direction intersecting with the chucking mechanism;
A plurality of reduced diameter members that can be attached to the inside of the plurality of chuck members in the radial direction, wherein the plurality of chuck members at the holding position can directly hold a large diameter portion of the connection member. On the other hand, a plurality of reduced diameter members that allow the plurality of chuck members at the holding position to clamp the steel pipe pile through the plurality of reduced diameter members,
Equipped with a,
The chuck mechanism has a wedge member that moves the plurality of chuck members in the radial direction by sliding outward in the radial direction with respect to the plurality of chuck members suspended via a link,
Each of the plurality of reduced-diameter members,
For each of the plurality of chuck members, a main body disposed inside in the radial direction,
Having an arm portion that can be arranged on each of the plurality of chuck members,
The steel pipe pile burying system , wherein only the arm portion of each of the plurality of reduced diameter members can be fixed to the chuck member using a fastening member . In said vertical direction, the stroke length of the chuck member between the lower position and the upper position by the vertical movement mechanism, according to claim 9, characterized in longer than the length of the reduced-diameter member Steel pipe pile burial system. One of the main body and the chuck member has at least one ridge extending along the vertical direction,
Other of the main body portion and said chuck member, said extending along a vertical direction, according to claim 9 or 1 0 said at least one projection is characterized by having at least one groove fittable Steel pipe pile burial system.

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