JP2011032659A - Joint structure of rotating press-fit steel pipe pile and method for constructing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a rotating press-fit steel pipe pile, which dispenses with field welding while enabling bidirectional transmission of rotation, which can be mechanically connected by simple operations, and which requires only the slight working of the steel pipe pile itself by virtue of a simple constitution. <P>SOLUTION: A joint pipe 3, which is rotatably fitted across a lower portion of the upside steel pipe pile 1<SB>A</SB>and an upper portion of the downside steel pipe pile 1<SB>B</SB>, is provided. The upside steel pipe pile 1<SB>A</SB>is provided with a central protrusion B<SB>A</SB>for the transmission of the rotation; and a lateral protrusion C<SB>A</SB>for the transmission of the rotation, which is engaged with the protrusion B<SB>A</SB>by relative rotation, is provided. The joint pipe 3 is provided with an upper protrusion D<SB>A</SB>for the transmission of a pull-out force; and the upside steel pipe pile 1<SB>A</SB>is provided with a lower protrusion A<SB>A</SB>for the transmission of the pull-out force, which is engaged with an undersurface of the protrusion D<SB>A</SB>by relative rotation. The downside steel pipe pile 1<SB>B</SB>and the joint pipe 3 are also provided with protrusions A<SB>B</SB>, B<SB>B</SB>, C<SB>B</SB>and D<SB>B</SB>similar to the protrusions A<SB>A</SB>, B<SB>A</SB>, C<SB>A</SB>and D<SB>A</SB>, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a joint structure of a rotary press-fit type steel pipe pile that is a pile foundation or the like that supports a structure such as a building or a house, and a construction method thereof.

  Some steel pipe piles, such as pile foundations, are provided with a spiral tip blade at the lower end for press-fitting into the ground, and press-fitting while rotating. When steel pipe piles can be pressed into the ground deeply, the length of one steel pipe pile is insufficient, so a plurality of pipes are sequentially connected while being pressed into the ground. When connecting steel pipe piles, it is necessary to enable rotation transmission in the rotary press-fit type steel pipe piles. Moreover, in order to change due to an error in the press-fitting position of the steel pipe pile or to correct the inclination, it may be necessary to rotate the steel pipe pile in the reverse direction and pull it out. Therefore, it is necessary to enable transmission of reverse rotation.

  For this reason, in the rotary press-fit type steel pipe pile, the upper and lower steel pipe piles are joined by welding or the like, but on-site welding is troublesome and requires a welding engineer who is a special technician. Various joint structures have been proposed in which such problems due to field welding are eliminated, and the connection is mechanically simple and strong so that rotation can be transmitted without relying on welding (for example, Patent Document 1).

JP 2001-200355 A

  Conventional connection by field welding takes time and effort as described above, and requires a welding engineer who is a special engineer. In addition, the mechanical joint structure proposed in Patent Document 1 does not require on-site welding, but welds an annular joint material to upper and lower steel pipe piles that are connected to each other, and connects the upper and lower joint materials to each other. It shall be mechanically connected. Therefore, it is necessary to make a steel pipe pile into a steel pipe pile with a joint material, and the prepared steel pipe pile becomes a special structure and the joint structure becomes complicated. Although it is a factory welding operation, it is necessary to weld the entire circumference of the annular joint material to the steel pipe pile, and it takes time to produce the steel pipe pile with the joint material.

The object of the present invention is to provide rotary press-fitting that allows bidirectional rotation transmission but does not require on-site welding, can be mechanically connected by simple operations, has a simple structure, and requires only a small amount of processing of the steel pipe pile itself. It is to provide a joint structure for type steel pipe piles.
Another object of the present invention is to provide a construction method capable of preventing initial settlement in the joint structure of a rotary press-fit type steel pipe pile according to the present invention.

The joint structure of the rotary press-fit type steel pipe pile according to the present invention is such that each steel pipe pile made of a circular steel pipe is successively joined up and down, and the lower steel pipe pile has a spiral tip blade and is press-fitted while rotating with respect to the ground. A connection-type rotary press-fit type steel pipe pile is a joint structure for connecting upper and lower steel pipe piles to each other, and is characterized by the following configuration.
An outer shell that is rotatably fitted over the lower part of the upper steel pipe pile and the upper part of the lower steel pipe pile that are connected to each other and that is interposed between the lower end surface of the upper steel pipe pile and the upper end face of the lower steel pipe pile. A joint pipe is provided. An outer peripheral concave surface on the upper pile side and a lower pile side in which the outer peripheral surface is recessed to form a gap with the steel pipe pile in the portion fitted to the upper steel pipe pile and the portion fitted to the lower steel pipe pile of the joint pipe Each of the outer peripheral concave surfaces is provided.
Providing a central rotation transmission protrusion on either one of the upper pile side outer circumferential concave surface of the joint pipe and the concave surface facing surface which is the inner surface portion of the upper steel pipe pile facing the upper pile side outer circumferential concave surface, On the other surface, side rotation transmission projections that are located on both sides in the circumferential direction of the steel pipe pile with respect to the central rotation transmission projection are engaged by the relative rotation. And the upper pulling force transmission protrusion is provided on the upper pile side outer peripheral concave surface of the joint pipe, and the lower portion is located below the upper pulling force transmission protrusion on the concave surface facing surface of the steel pipe pile. Pull-out force transmission protrusions are provided, and the steel pipe pile circumferential positional relationship between the upper pull-out force transmission protrusions and the lower pull-out force transmission protrusions is given to the upper steel pipe pile by rotating the pull-out side to transmit the center rotation. The projecting protrusions can be engaged with each other in a relative rotational state in which the projecting protrusions are engaged with the side rotation transmitting projections, and the central rotation transmitting projections are intermediate between the left and right side rotation transmitting projections. In the relative rotation state, the positional relationship is such that they cannot be engaged vertically.
For central rotation transmission on the lower pile side on one surface of the lower pile side outer circumferential concave surface of the joint pipe and the concave surface facing surface which is the inner surface portion of the lower steel pipe pile facing the lower pile side outer circumferential concave surface Protrusions are provided, and on the other surface, side pile transmission projections on the lower pile side that are located on both sides of the steel pipe pile circumferential direction with respect to the central rotation transmission projections and engage by the relative rotation are provided. And the lower part pulling force transmission protrusion is provided in the lower pile side outer periphery concave surface of the joint pipe, and the lower part located above the lower pulling force transmission protrusion on the concave surface opposing surface of the steel pipe pile Pull-out force transmission protrusions are provided, and the steel pipe pile circumferential positional relationship between the lower pull-out force transmission protrusions and the lower pull-out force transmission protrusions is given to the upper steel pipe pile by rotating the pull-out side. The central rotation transmission projections of the lower piles can be engaged with each other in a relative rotational state engaged with the side rotation transmission projections, and the lower pile side central rotation transmission projections are on the left and right sides. In the relative rotation state in the middle between the rotation transmission projections, the positional relationship is such that they cannot be engaged vertically.

  In this configuration, the joint pipe cannot be moved up and down relative to the steel pipe pile, either or both between the joint pipe and the upper steel pipe pile and between the joint pipe and the lower steel pipe pile. You may provide the relative rotation permissible coupling | bond part which couple | bonds rotation with a permissible state. The relative rotation allowable range of the relative rotation allowable coupling portion may be a rotation range in which the central rotation transmission protrusion can be engaged with the side rotation transmission protrusions on both sides.

According to this configuration, after press fitting the lower steel pipe pile into the ground, the lower part of the joint pipe is fitted to the upper end of the lower steel pipe pile, and the lower end of the upper steel pipe pile is fitted to the upper part of the joint pipe. When press-fitting is performed while rotating the upper steel pipe pile in this state, the upper and lower steel pipe piles are connected via the joint pipe.
In this connection completed state, the downward compression force due to the pressure input acting on the steel pipe pile and the load of the upper structure will be through the outer pipe of the joint pipe, but without going through the main body of the joint pipe, It is transmitted directly between the end faces of steel pipe piles. When the upper steel pipe pile is rotated in the normal rotation direction, which is the pile penetration direction, the central rotation transmission protrusion and one side rotation transmission protrusion are engaged between the upper steel pipe pile and the joint pipe, The rotation is transmitted from the steel pipe pile to the joint pipe. Also between the joint pipe and the lower steel pipe pile, the central rotation transmission protrusion and one of the side rotation transmission protrusions are engaged, and the rotation is transmitted from the joint pipe to the lower steel pipe pile. In this way, rotation is transmitted from the upper steel pipe pile to the lower steel pipe pile via the joint pipe. When the upper steel pipe pile is rotated in the opposite direction, the central rotation transmission protrusion and the other side rotation transmission protrusion are engaged between the upper steel pipe pile and the joint pipe. Is transmitted to the rotation. Also at the ends of the joint pipe and the lower steel pipe pile, the central rotation transmission protrusion and the other side rotation transmission protrusion are engaged, and the rotation is transmitted from the joint pipe to the lower steel pipe pile. Thus, reverse rotation is transmitted from the upper steel pipe pile to the lower steel pipe pile via the joint pipe. In the engaged state of the rotation transmission protrusion at the time of reverse rotation, in each of the part corresponding to the upper steel pipe pile and the part corresponding to the lower steel pipe pile of the joint pipe, below the upper pulling force transmission protrusion. The lower pulling force transmission protrusion is positioned, and the vertical engagement between the two protrusions enables transmission of a pulling force as a pulling force from the upper steel pipe pile to the lower steel pipe pile.
In this way, although the two-way rotation transmission of the steel pipe pile is possible, on-site welding is unnecessary, it can be mechanically connected by a simple operation, the configuration is simple, and the processing of the steel pipe pile itself is small.

In addition, you may perform the auxiliary welding for improving workability. For example, after fitting the joint pipe, when rotation is applied and the rotation of the upper steel pipe pile can be transmitted to the lower steel pipe pile, the upper and lower steel pipe piles are temporarily attached to the joint pipe. The welding may be performed. By welding in this way, the vertical position shifts between the upper and lower steel pipe piles and the joint pipe during construction, that is, between the outer pipe of the joint pipe and the ends of the upper and lower steel pipe piles. A gap is prevented from being generated. Thereby, when the load of the superstructure acts after the completion of pile driving, it is avoided that the initial settlement that closes the gap occurs. The temporary fastening welding is not limited to a specialized welding engineer and may be simple welding as long as it can be fixed to such an extent that a gap is prevented from being generated by the action of the pulling force during construction.
Even when the relative rotation permissible coupling portion is provided, it is possible to always maintain the state in which the lower end surface of the upper steel pipe pile is in contact with the outer shell of the joint pipe, and to avoid initial settlement.

  Any of the central rotation transmission projection and the side rotation transmission projection may be provided on the joint pipe side, but the central rotation transmission projection is provided on the outer circumferential concave surface of the joint pipe, and the side When the protrusion for part rotation transmission is provided on the concave surface facing surface of the upper steel pipe pile, only one rotation transmission protrusion is provided on the steel pipe pile, and the processing part of the steel pipe pile is less. In addition, when the central rotation transmission protrusion is arranged on the steel pipe pile side, the space between the steel pipe pile formed by the outer peripheral concave surface of the joint pipe is more effective than the reverse arrangement. This gap can be small.

  The joint structure of the rotary press-fit type steel pipe pile according to the present invention is such that each steel pipe pile made of a circular steel pipe is successively joined up and down, and the lower steel pipe pile has a spiral tip blade and is press-fitted while rotating with respect to the ground. In a connection type rotary press-fit type steel pipe pile, it is a joint structure that connects the upper and lower steel pipe piles to each other, and fits rotatably between the lower part of the upper steel pipe pile connected to each other and the upper part of the lower steel pipe pile And a joint pipe having an outer periphery interposed between the lower end surface of the upper steel pipe pile and the upper end face of the lower steel pipe pile on the outer periphery, and a portion fitted to the upper steel pipe pile of the joint pipe and the lower steel pipe pile The upper pile side outer periphery of the joint pipe is provided with an outer peripheral concave surface on the upper pile side and an outer peripheral concave surface on the lower pile side that form a gap between the steel pipe pile and the outer peripheral surface is recessed. The upper steel pipe facing the concave surface and the outer peripheral concave surface on the upper pile side The central rotation transmission protrusion is provided on one surface of the concave surface facing surface that is the inner surface portion of the inner surface portion, and the other surface is located on both sides of the steel pipe pile circumferential direction with respect to the central rotation transmission protrusion. Providing side rotation transmission protrusions engaged by relative rotation, and providing an upper pulling force transmission protrusion on the upper pile side outer peripheral concave surface of the joint pipe, on the concave surface facing surface of the steel pipe pile, The lower pulling force transmission protrusions are provided below the upper pulling force transmission protrusions, and the steel pipe pile circumferential positional relationship between the upper pulling force transmission protrusions and the lower pulling force transmission protrusions is determined. The upper steel pipe pile can be engaged with each other in the relative rotational state in which the central rotation transmission protrusion is engaged with the side rotation transmission protrusion by applying the pulling side rotation, and the central rotation transmission protrusion. In the relative rotation state where the part is in the middle between the right and left side rotation transmission projections Any one of the lower pile side outer peripheral concave surface of the joint pipe and the concave surface facing surface that is the inner surface portion of the lower steel pipe pile facing the lower pile side outer peripheral concave surface of the joint pipe The lower pile side is provided with a projection for central rotation transmission on the lower pile side, and is located on both sides in the circumferential direction of the steel pipe pile with respect to the projection for central rotation transmission on the other side. And a lower pulling force transmitting protrusion on the lower pile side outer peripheral concave surface of the joint pipe, and the lower pulling force transmission on the concave surface facing surface of the steel pipe pile. The lower pulling force transmission protrusions are located above the projecting protrusions, and the steel pipe pile circumferential positional relationship between these lower pulling force transmission protrusions and the lower pulling force transmission protrusions is Phase in which the central rotation transmission protrusion on the lower pile side is engaged with the side rotation transmission protrusion by applying rotation on the pulling side Engage with each other in the counter-rotation state and engage with each other in the relative rotation state where the central rotation transmission protrusion on the lower pile side is intermediate between the left and right side rotation transmission protrusions Because it is in a positional relationship that makes it impossible, bidirectional rotation transmission is possible, but on-site welding is not required, it can be mechanically connected with simple work, and the configuration is simple, requiring only a small amount of processing of the steel pipe pile itself .

  The construction method of the rotary press-fit type steel pipe pile according to the present invention is a construction method using the joint structure of the rotary press-fit type steel pipe pile according to the present invention, wherein the lower steel pipe pile is press-fitted into the ground, and the joints are connected to the upper and lower steel pipe piles. When the pipes are fitted and the upper steel pipe pile is rotated to transmit rotation from the upper steel pipe pile to the lower steel pipe pile, the upper and lower steel pipe piles are temporarily fixed to the joint pipe by welding. , Can prevent initial settlement.

It is a fracture | rupture front which shows the placement process of the rotary press-fit type steel pipe pile to which the joint structure which concerns on 1st Embodiment of this invention is applied. It is a vertical sectional view of the joint structure of the same rotary press-fit type steel pipe pile. (A), (B) is sectional drawing which shows the IIIA-IIIA cross section and IIIB-IIIB cross section of FIG. 2, respectively. It is explanatory drawing which shows the relationship between arrangement | positioning of the protrusion for extraction force transmission, and the angle of a front-end | tip blade | wing. It is effect | action explanatory drawing which shows the set state of the joint structure, the state at the time of rotation press-fitting, and the state at the time of reverse rotation drawing. It is a vertical sectional view of the joint structure of the rotary press-fit type steel pipe pile according to another embodiment of the present invention. It is a front view of the relative rotation permissible coupling part. It is a fracture front view showing each state before and after joining of an example of a one side bolt used for the joint structure.

An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the joint structure of this rotary press-fit type steel pipe pile is formed by successively connecting a plurality of steel pipe piles 1 each made of a circular steel pipe up and down, and the lower end of the steel pipe pile 1 ₁ has a conical tip 1a. In the connection-type rotary press-fit steel pipe pile 10 that is press-fitted while rotating with respect to the ground G, the joint structure that connects the upper and lower steel pipe piles 1 to each other has the spiral tip blade 2.

  In the pile driving machine 20, for example, a prop 22 is provided on a travelable pile driving machine 21, and a lifting head 23 that can be moved up and down along the pillar 22 grips an upper end of the rotary press-fit steel pipe pile 10. What provided the tool 24 is used. The column 22 rotates the pile head gripping tool 24 with respect to the lifting body 23 and a lifting drive source 25 such as a hydraulic cylinder that applies pressure and pulling force to the rotary press-fit steel pipe pile 10 by moving the lifting body 23 up and down. And a rotary drive source (not shown) such as a hydraulic motor or an electric motor that rotates the rotary press-fit steel pipe pile 10. The rotational drive source can switch the rotational direction in the forward and reverse directions.

As shown in FIGS. 2 and 3, this joint structure is a joint that is rotatably fitted to the inner peripheral side across the lower part of the upper steel pipe pile 1 _{A and} the upper part of the lower steel pipe pile 1 _B that are connected to each other. A tube 3 is provided. Joint pipe 3, the vertical direction of the intermediate, having an outer flange 3a interposed between the upper surface of the lower end surface of the upper steel pipe pile 1 _A and the lower steel pipe pile 1 _B on the outer circumference. The joint pipe 3 is made of, for example, a steel pipe. The outer casing 3a is formed, for example, by plastically deforming an intermediate portion of a steel pipe that is a material of the joint pipe 3. In the illustrated example, the outer casing 3a has a double-folded shape in which the tube wall of the material steel pipe is expanded in a U-shaped cross section toward the outer peripheral side, and the U-shaped protruding portion is flattened.

Joint pipe 3, the portion to be fitted to the upper steel pipe pile 1 _A, and the portion to be fitted to the lower steel pipe pile 1 _B, pile side on which to form a gap between the steel pipe pile 1 _A recessed outer circumferential surface The outer peripheral concave surface 3b _A and the upper outer peripheral concave surface 3b _B are provided. Each of the outer peripheral recessed surfaces 3b _A and 3b _B is formed, for example, by plastic processing the tube wall of the joint tube 3 into a flat plate shape, and is provided at a plurality of locations in the circumferential direction (two locations in the illustrated example). It is done. Further, the outer peripheral recessed face 3b _A of the upper pile side and Shitakui side, 3b _B is provided in the same positions in the circumferential direction.

Each recessed surface facing surfaces 1a _A which is the inner surface portion of the upper steel pipe pile 1 _A facing each outer peripheral recessed face 3b _A on pile side of the joint pipe 3 is provided a center rotation transmission projections A _A, joint pipe each outer peripheral recessed face 3b _a 3, are located on opposite sides of the steel pipe pile circumferential direction relative to the central rotation transmission projections B _a, side rotation transmission projections C _a, is C _a is provided. The central rotation transmission projection B _A and the side rotation transmission projections C _A and C _A can be engaged with each other at the side edges by the relative rotation of the joint pipe 3 and the upper steel pipe pile 1 _A. The These central rotation transmitting projection B _A and side rotation transmission projections C _A, C _A is as joined by welding or the like plate piece of steel plate or the like to the upper steel pipe pile 1 _A and joint pipe 3, respectively, Alternatively, it is assumed that the upper steel pipe pile _1A and the joint pipe 3 are provided by plastic working, overlay welding, or the like. In the illustrated example, a steel sheet which is curved along the tube wall of the upper steel pipe pile 1 _A is used as the rotation transmitting projection B _A, side rotation transmission projections C _A, is C _A, the outer peripheral recessed face 3b A steel sheet having a thin side edge is used. The front shapes of the central rotation transmission projection B _A and the side rotation transmission projections C _A and C _A are all rectangular in the illustrated example, but may be any shape as long as they can be engaged with each other. good. For example, the central rotation transmitting projection B and the side rotation transmission projections C _A, may be constituted by C boss either one or both pins or round the _A or the like.

The outer peripheral concave surface 3b _A of the joint plate 2 is further provided with a pair of upper pulling force transmission protrusions D _A and D _A , and the upper pulling force transmission surface 1a _A of the upper steel pipe pile 1 _A is used for transmitting the upper pulling force. _A lower pulling force transmission protrusion A _A is provided below the protrusions D _A and D _A. The steel pipe pile circumferential positional relationship between the upper pulling force transmission protrusions D _A and D _A and the lower pulling force transmission protrusion A is the reverse rotation or press-fitting side, which is the rotation on the upper steel pipe pile 1 _A. forward rotation given to the central rotation transmitting projection B left or right side rotation transmission projections C _a, relative rotation engaged with the C _a which is the rotation (FIG. 5 (B), (D) ) In the relative rotation state in which the central rotation transmission projections B _A are intermediate between the side rotation transmission projections C _A and C _A on both sides (FIG. 5A). ) Is a positional relationship in which they cannot be engaged with each other vertically.

The upper pull-out force transmitting protrusion D _A, D _A and a lower pull-out force transmitting projection A _A also is to those joined by welding or the like plate piece of steel plate or the like to the joint pipe 3 and the upper steel pipe pile 1 _A respectively Alternatively, the joint pipe 3 and the upper steel pipe pile 1 _A are provided by plastic working or the like.

The lower pulling force transmission projection A _A and the central rotation transmission projection B _A are provided at the same position in the circumferential direction of the steel pipe pile. Pairs of upper and lower positions of the lower pullout force transmitting projections A _A and the upper pull-out force transmitting protrusion D _A, a set of upper and lower positions of the projections for central rotation transmission B _A and side rotation transmission projections C _A is reversed to each other from the example illustrated, it may be disposed lower pullout force set of transmission projection a _a and the upper pull-out force transmitting projection D _a on the upper side.

In this embodiment, it is provided two upper pullout force transfer protrusion D _A, the upper drawing force transmitting projection D _A thing while engaged during withdrawal only (of the right side of the figure) It may be provided.

Also the recessed surface facing surfaces 1a _B which is the inner surface portion of the lower steel pipe pile 1 _B facing each outer peripheral recessed face 3b _B and the face 3b _B under pile side of the joint pipe 3, the respective projections A _A, Projections A _B , B _B , C _B , D _B similar to B _A , C _A , D _A are provided.

That is, the projections A _B for central rotation transmission provided in each recessed surface opposed surfaces 1a _B which is the inner surface portion of the lower steel pipe pile 1 _B facing each outer peripheral recessed face 3b _B of the lower pile side of the joint pipe 3 , each outer peripheral recessed face 3b _B of the joint pipe 3, located on either side of the steel pipe pile circumferential direction relative to the central rotation transmission projections B _B, projections C _B for side rotation transmission, is C _B provided ing. These central rotation transmission projections B _B and side rotation transmission projections C _B and C _B can be engaged with each other at the side edges by relative rotation of the joint pipe 3 and the lower steel pipe pile 1 _B. Is done.

The outer peripheral recessed face 3b _B of the joint pipe 3, further pair of lower pullout force transmitting projections A _B, the A _B provided on the recessed surface facing surfaces 1a _B of the lower steel pipe pile 1 _B, the lower pullout force transfer use projections a _B, it is provided with one lower pullout force transfer protrusion D _B which is located above the a _B. These lower pullout force transmitting projections A _B, the steel pipe pile circumferential direction of the positional relationship between A _B and the upper pull-out force transmitting protrusion D _B, reverse rotation or press fit is a rotation of the pull-out side to the upper steel pipe pile 1 _B forward rotation given central rotation transmission projections B left or right side rotation transmission projections C _B, which is a rotating side, the relative rotation engaged with the C _B (FIG. 5 (C), (E in)) is engageable on top of each other, and projections for central rotation transmitting projection B _B is opposite side rotation transmission C _B, C relative rotation state in the middle between the _B (FIG. 5 (a In the case of ()), the positional relationship is such that they cannot be engaged vertically.

The projections A _B below pile side, B _B, C _B, details and variations of D _B are the projections A _A of the upper pile side, B _A, C _A, Details and variations of D _A It is the same. However, the projections A _B below pile side, _B B, C _B, the projections _A A of D _B and the upper pile side, B _A, the upper and lower arrangement of C _A, D _A is the subject to each other ing.

The operation of the above configuration will be described. The pile driver 20, the addition of press-fitting force while giving a rotation to the steel pipe pile 1 ₁ of the lower end, the steel pipe pile 1 ₁ is pressed into the ground G. When the upper end of the steel pipe pile 1 ₁ is press-fitted until the close of the ground G, and the steel pipe pile 1 _1, connects the upper steel pipe pile 1 in the joint structure of this embodiment, the upper side of the upper end of the steel pipe pile 1 Rotation and pressure input are applied from the pile driver 20.

In this joint structure, the joint pipe 3 is fitted to the upper end of the lower steel pipe pile 1 _B, the lower end of the upper steel pipe pile 1 _A fitted to this joint pipe 3.
Set when this joint pipe 3, as shown in FIG. 5 (A), both the upper and lower pile side protrusion B for central rotation transmission _A, B _B is opposite side rotation transmission projections C _A, C _A In the middle of C _B and C _B , and on the upper pile side, the lower pulling force transmission protrusion A _A is in the center between the upper pulling force transmission protrusions D _A and D _{A on} both sides. Under pile side, the upper pull-out force transmitting projection D _B sides of the lower pullout force transmitting projections A _B, in the middle between A _B. Therefore, the central rotation transmission projections B _A and B _B and the lower extraction force transmission projections A _A and A _B are the side rotation transmission projections C _A , C _A , C _B and C _B and the upper extraction force. The upper end of the lower steel pipe pile 1 _B and the lower end of the upper steel pipe pile 1 _A can be fitted to the joint pipe 3 without interfering with the transmission protrusions D _A and D _B.

At the time of rotation press-fitting, the upper steel pipe pile 1 _A is given positive rotation from the pile driving machine 20 (FIG. 1), so that the central rotation transmission protrusion B _A on the upper pile side as shown in FIG. 5 (B). There engage the side surfaces of the side rotation transmission projections C _a of one (left side in the figure), the rotation of the upper steel pipe pile 1 _a is transmitted to the joint pipe 3. When the further rotation of the upper steel pipe pile 1 _A, joint pipe 3 is rotated together with the upper steel pipe pile 1 _A, as shown in FIG. (C), side rotation transmitting collision of one of the joint pipe 3 (FIG right) part C _B engages with the central rotation side of the transfer protrusions B _B of the lower steel pipe pile 1 _B, the rotation of the joint pipe 3 is transmitted to the lower steel pipe pile 1 _B. Therefore, so that the rotation of the upper steel pipe pile 1 _A is transmitted to the lower steel pipe pile 1 _B.

The downward compressive force acting as a pressure input on the upper steel pipe pile 1 _A is via the outer casing 3a of the joint pipe 3, but the upper and lower steel pipe piles _1A , 1 are not passed through the main body of the joint pipe 3. It is transmitted directly between the end faces of _B. The load of the superstructure after completion of press-fitting of the rotary press-fit type steel pipe pile 1 is also directly transmitted between the end faces of the upper and lower steel pipe piles 1 _A and 1 _B as described above. Therefore, the pressure input is transmitted regardless of the strength of the joint pipe coupling portion 7.

As shown in FIG. 5D, when the reverse pulling is performed, a reverse rotation is applied to the upper steel pipe pile 1 _A , so that the central rotation transmission projection B _A on the upper pile side is on the other side (in the figure). engage the sides of the side rotation transmission projections C _a right), reverse rotation of the upper steel pipe pile 1 _a is transmitted to the joint pipe 3. At this time, projection A _A for the lower pullout force transmitted, enters the bottom of the upper pull-out force transmitting projection D _A at the bottom of the side rotation transmission projections C _A of the engaging side.
When the upper steel pipe pile _1A is further rotated in the opposite direction, the joint pipe 3 rotates as shown in FIG. 5E while maintaining the rotational phase relationship between the upper steel pipe pile _1A and the joint pipe 3. Thus, the other engages in the center rotating side of the transfer protrusions B _B below are side rotation transmission projections C _B side steel pipe pile 1 _B (on the left in the figure) of the joint pipe 3 under the pile side , the reverse rotation of the joint pipe 3 is transmitted to the lower steel pipe pile 1 _B. Therefore, so that the reverse rotation of the upper steel pipe pile 1 _A is transmitted to the lower steel pipe pile 1 _B.
At this time, projections A _B for the lower pullout force transfer of the lower pile side, enters under the lower pullout force transfer protrusion D _B which is above the engagement side of the side rotation transmission projections C _B. Also, projections A _A for the lower pullout force transmission in pile side on the above, enters the bottom of the upper pulling force transmitting projection D _A at the bottom of the side rotation transmission projections C _A of the engaging side State is maintained.

Therefore, given a force pulling the upper steel pipe pile 1 _A, by the engagement of the lower pullout force transmitting projections A _A and the upper pull-out force transmitting protrusion D _A in the above pile side, the upper steel pipe pile 1 _A withdrawal The force is transmitted to the joint pipe 3. Further, pulling force transmitted to the joint pipe 3, by the engagement of the lower pullout force transmitting projections A _B and the upper pull-out force transmitting protrusion D _B in the lower pile side is transmitted to the lower steel pipe pile 1 _B . Therefore pulling force of the upper steel pipe pile 1 _A will be transmitted to the lower steel pipe pile 1 _B.

In this embodiment, the central rotation transmission projections B _A, a B _B provided in the steel pipe pile 1 _A, 1 _B, side rotation transmission projections C _A, is provided with the C _A to the joint pipe 3, contrary to the above, the central rotation transmission projections B _a, provided B _B to the joint pipe 3, the side rotation transmission projections C _a, may be provided C _a steel pipe pile 1 _a, 1 _B.

According to the joint structure of the rotary press fit steel pipe pile, thus, the upper steel pipe pile 1 _A itself, and one of the central rotation transmitting projection B _A and side rotation transmission projections C _A, lower It need only provide a pulling force transmitting projections a _a. Furthermore, the lower steel pipe pile 1 _B itself, simply by providing one and one of the central rotation transmitting projection B _B and the side rotation transmission projections C _B, and an upper pulling force transmitting projection D _B That's it. Therefore, it is sufficient to process the steel pipe pile itself.
The joining operation, the joint pipe 3 is fitted to the upper end of the lower steel pipe pile 1 _B, in the joint pipe 3 need only fitting the lower end of the upper steel pipe pile 1 _A. In addition, the compressive force of press-fitting and load support is directly transmitted between the upper and lower joint pipes 1 _A and 1 _B , and the joint pipe 3 is not required to have a strong strength for compressive force load. Therefore, although it is possible to transmit the rotation in both directions, on-site welding is not required, the connection can be mechanically performed with a simple operation, the structure is simple, and the joint structure requires only a small amount of processing of the steel pipe pile itself.

In addition, as shown in FIG. 4, the lower surface Da of the upper pulling force transmission protrusions D _A and D _A on the upper pile side has, for example, a V-shaped front shape. 4, FIG. 5 (B), the manner of (C), in a state where the central rotation transmitting projection B _A is engaged with the side surface of the side rotation transmission projections C _A of one (left side in the figure) certain time, showing the positional relationship between the upper pulling force transmitting projections on the opposite side of the engaged side rotation transmitting projection C _a D _a and the lower pullout force transfer protrusion a _a. In this state, the upper drawing force and side edges upper end P of the transfer protrusions D _A side, the lower pullout force transmitting collision of the lower surface Da of the upper pull-out force transmitting projections D _A of the lower pullout force transmitting projection A _A The inclination angle θ of the straight line L connecting the side edge Q on the part A _A side is set to be smaller than the inclination angle α of the tip blade 1a (FIG. 1). The inclination angle of the straight line (not shown) corresponding to the shape and the straight line L of the upper surface of the lower pullout force transmitting projections A _B below pile side is made smaller than the inclination angle α of the same manner as described above the tip vane 1a . Thereby, the poor engagement when the steel pipe pile 1 is reversely rotated and pulled out is avoided. That is, when the steel pipe pile 1 is reversely rotated and pulled out, the lower steel pipe pile 1 _B rises at the inclination angle α of the tip blade 1a. At this time, in the reverse rotation, as indicated by one-dot chain line in the figure, when the lower pullout force transmitting projections A _A came to a side surface of the upper pull-out force transmitting protrusion D _B, the lower side edge When the side edges upper end P of the lower pullout force transmitting projection a _a than Q is above both突突unit D _B, a _a interfere, for the lower pullout force transmitting projections a _a upper pull-out force transmitting there is a possibility that it is inhibited from entering the lower side of the protrusion D _B. However, by setting the inclination angle θ of the straight line L to be small as described above, it is possible to surely enter without causing the above-described problem of entry inhibition.

6 to 8 show another embodiment of the present invention. This embodiment differs from the joint pipe 3 upper steel pipe pile 1 _A and lower steel pipe pile 1 _B, in which the relative rotation permitting coupling portion 4 for coupling provided in permitting relative rotation and vertical movement, respectively disabled state is there. Other configurations are the same as those of the embodiment shown in FIGS. For example, as shown in FIG. 7, the relative rotation allowable coupling portion 4 includes a long hole 5 extending along the circumferential direction in the joint pipe 3, and the upper and lower steel pipe piles 1 _A and 1 _B inserted through the long hole 5. And an engaging pin 6 fastened to. On the contrary, the upper and lower steel pipe piles 1 _A and 1 _B may be provided with long holes along the circumferential direction, and the engagement pin may be fixed to the joint pipe 3. Although the following one side bolt etc. are used for the engaging pin 6 in this embodiment, you may use a normal volt | bolt and a pin.

FIG. 8 shows an example of a one-side bolt that can be used for the joint pipe coupling portion 7. The term “one-side bolt” as used in this specification is a general term for a shaft-like fastening fitting that can be tightened by being plastically deformed in a state where the head is expanded in diameter at the other end by operation from one end side. It is also called a one-side tightening rivet. The one-side bolt 31 shown in the figure is screwed into a pin 32, a sleeve 33 fitted to the outer periphery of the pin 32 and having a tip engaged with a pin head portion 32 a of the pin 32, and a male screw portion 32 b of the pin 32. And a nut 34 capable of pressing the rear end of the sleeve 33.
The pin 32 has a pin head portion 32a having a diameter slightly larger than that of the round shaft portion 32c at the tip, and has a male screw portion 2b formed at the rear portion, and a tool engaging portion 32d extending rearward of the male screw portion 32b. Is formed. A fracture groove 32e is formed in the middle of the male screw portion 2b in the axial direction, and a pin portion behind the fracture groove 32e serves as a pin tail 32f. The sleeve 33 integrally has a sleeve main body 33a and a thick cylindrical receiving ring portion 33d extending rearwardly through a shearing flange portion 33c on the outer periphery of the rear end of the sleeve main body 33a. The sleeve body 33a has a predetermined length range near the tip as a soft sleeve portion 3b that is softer than the general portion 33ab. The soft sleeve portion 33 b can be buckled in a bulging state on the outer periphery by applying an axial compressive load to the sleeve 3. The shearing flange portion 33c can be sheared by applying a predetermined compressive load, which is larger than the compressive load at which the soft sleeve portion 33b is in a predetermined buckling state, to the sleeve 33. The inner diameter of the receiving ring portion 33d is a diameter that allows the rear end of the sleeve body 33a in a state where the shearing flange portion 33c is sheared to enter, and has a larger diameter than the inner diameter of the sleeve body 33a.

The fastening operation of the one-side bolt 31 can be performed using a rotary electric fastening tool (not shown). That is, after inserting into the bolt hole 35 of the joint pipe 3 and the steel pipe pile _1A which are to-be-tightened materials, the nut 34 is tightened in a state where the pin tail 32f is gripped by a tightening tool. As a result, a compressive force acts between the pin head portion 32a and the receiving ring portion 33d to sandwich the sleeve main body 33a, and the soft sleeve portion 33b at the tip first begins to buckle outwardly in a bowl shape. Further, when the nut 34 is tightened, the shearing flange portion 33c shears, and the rear end of the sleeve body 33a enters the receiving ring portion 33d. As the tightening further proceeds, a tightening axial force is introduced between the nut 34 and the flanged buckling portion 33e to the joint pipe 3 and the steel pipe pile _1A , which are the materials to be tightened that overlap each other.

When this relative rotation permissible coupling part 4 is provided, when the joint pipe 3 is fitted to the upper and lower steel pipe piles 1 _A and 1 _B , the pin 6 made of the one-side bolt 31 is inserted into the long hole 5. Let The upper steel pipe pile 1 _A rotates, the respective rotation transmitting protrusion _{B A, B B, C A} , allows transmission of rotation from the upper steel pipe pile 1 _A to the lower steel pipe pile 1 _B by the engagement of C _B Then, the pin 6 composed of the one-side bolt 31 is tightened. By providing the relative rotation allowance coupling portion 4 in this way, the upper and lower steel pipe piles 1 _A and 1 _B are prevented from shifting up and down with respect to the joint pipe 3 during the pile press-fitting work or the like, and initial settlement is prevented. .
That is, if there is a gap between the lower end surface of the upper steel pipe pile _1A and the flange 3a of the joint pipe 3, there is a risk that initial settlement will occur as much as the gap is filled. However, since the relative rotation permissible coupling portion 4 is provided as described above, the state where the lower end surface of the upper steel pipe pile _1A is in contact with the outer casing 3a of the joint pipe 3 is always maintained. Therefore, initial settlement can be avoided.

In addition, you may perform temporary fix | stop by welding instead of providing the relative rotation permissible coupling | bond part 4. FIG. That is, press-fitting the lower of the steel pipe pile 1 _B to ground, the joint pipe 3 is fitted to the top and bottom of the steel pipe pile 1 _A, 1 _B, the upper steel pipe pile 1 _A rotates, the respective rotation transmitting projection _{B a, B B, C a} , when it becomes possible transmission of rotation to the lower side of the steel pipe pile _B from the upper side of the steel pipe pile 1 _a by the engagement of C _B, the top and bottom of the steel pipe pile 1 _a, 1 _B The joint pipe 3 may be temporarily fixed by welding. This also causes the vertical displacement between the upper and lower steel pipe piles 1 _A and 1 _B and the joint pipe 3 during construction, that is, the outer flange 3a of the joint pipe 3 and the upper and lower steel pipe piles 1 _A and 1 _B. It is possible to prevent a gap from being generated between the end portions. Thereby, when the load of the superstructure acts after the completion of pile driving, it is avoided that the initial settlement that closes the gap occurs.

1 ... steel pipe pile 1 ₁ ... lower end of the steel pipe pile 1 _A ... upper steel pipe pile 1 _B ... lower steel pipe piles 1a _A, 1a _B ... recessed surface facing surfaces 2 ... tip blade 3 ... joint pipe 3a ... outer flange 3b _A, 3b _B ... Peripheral concave surface 4 ... Relative rotation permissible coupling part 5 ... Long hole 6 ... Engagement pin 7 ... Joint pipe coupling part 10 ... Rotary press-fit type steel pipe pile 20 ... Pile driver A _A , A _B ... For transmission of lower drawing force Projections B _A , B _B ... Central rotation transmission projections C _A , C _B ... Side rotation transmission projections D _A , D _B ... Upper pulling force transmission projection G ... Ground

Claims (4)

In the connection-type rotary press-fit type steel pipe pile that press-fits while rotating to the ground, assuming that the steel pipe piles made of circular steel pipes are successively connected up and down, and the bottom steel pipe pile has a spiral tip blade, A joint structure for connecting piles to each other,
An outer shell that is rotatably fitted over the lower part of the upper steel pipe pile and the upper part of the lower steel pipe pile that are connected to each other and that is interposed between the lower end surface of the upper steel pipe pile and the upper end face of the lower steel pipe pile. A joint pipe having
An outer peripheral concave surface on the upper pile side and a lower pile side in which the outer peripheral surface is recessed to form a gap with the steel pipe pile in the portion fitted to the upper steel pipe pile and the portion fitted to the lower steel pipe pile of the joint pipe Each of the outer peripheral concave surface of
Providing a central rotation transmission protrusion on either one of the upper pile side outer circumferential concave surface of the joint pipe and the concave surface facing surface which is the inner surface portion of the upper steel pipe pile facing the upper pile side outer circumferential concave surface, Provided on the other surface are side rotation transmission projections that are engaged by the relative rotation located on both sides of the steel pipe pile circumferential direction with respect to the central rotation transmission projections,
And an upper pulling force transmission protrusion on the upper pile side outer peripheral concave surface of the joint pipe, and a lower pulling position located below the upper pulling force transmission protrusion on the concave surface facing surface of the steel pipe pile. Protrusions for force transmission are provided, and the positional relationship in the circumferential direction of the steel pipe pile between the upper pulling force transmission protrusion and the lower pulling force transmission protrusion is applied to the upper steel pipe pile for rotation on the pulling side. The protrusions can be engaged with each other in a relative rotation state where the protrusions are engaged with the side rotation transmission protrusions, and the central rotation transmission protrusions are intermediate between the left and right side rotation transmission protrusions. In a relative rotation state, the positional relationship is such that they cannot be engaged with each other vertically,
For central rotation transmission on the lower pile side on one surface of the lower pile side outer circumferential concave surface of the joint pipe and the concave surface facing surface which is the inner surface portion of the lower steel pipe pile facing the lower pile side outer circumferential concave surface Providing a protrusion, on the other surface, provided on the opposite sides of the steel pile pile circumferential direction with respect to the central rotation transmission protrusion is provided a side rotation transmission protrusion on the lower pile side engaged by the relative rotation,
And a lower pulling force transmitting protrusion provided on the lower pile side outer peripheral recessed surface of the joint pipe, and a lower pulling force located above the lower pulling force transmitting protrusion on the recessed surface facing surface of the steel pipe pile. Protrusions for force transmission are provided, and the steel pipe pile circumferential positional relationship between these lower pull-out force transmission protrusions and lower pull-out force transmission protrusions is given to the lower pile side by applying rotation on the upper steel pipe pile. The central rotation transmission projections can be engaged with each other in a relative rotation state where the central rotation transmission projections are engaged with the side rotation transmission projections, and the central rotation transmission projections on the lower pile side rotate on the left and right sides. A joint structure of a rotary press-fit type steel pipe pile that is in a positional relationship in which it cannot be engaged with each other in the relative rotational state in the middle between the transmission protrusions.   2. The rotary press-fitting according to claim 1, wherein each of the central rotation transmission protrusions is provided on the outer peripheral recessed surface of the joint pipe, and each of the side rotation transmission protrusions is provided on the recessed surface facing surface of the upper steel pipe pile. Joint structure of type steel pipe pile.   3. The joint pipe according to claim 1 or 2, wherein the joint pipe is vertically moved with respect to the steel pipe pile between one or both of the joint pipe and the upper steel pipe pile and between the joint pipe and the lower steel pipe pile. A joint structure of a rotary press-fit type steel pipe pile that is provided with a relative rotation permissible coupling portion that cannot move and couples relative rotation to an allowable state.   A method for constructing a rotary press-fit type steel pipe pile using the joint structure of the rotary press-fit type steel pipe pile according to claim 1 or 2, wherein the lower steel pipe pile is press-fitted into the ground and the upper and lower steel pipe piles are connected to the joint pipe. When the upper steel pipe pile is rotated and rotation transmission from the upper steel pipe pile to the lower steel pipe pile becomes possible, the upper and lower steel pipe piles are temporarily fixed to the joint pipe by welding. A construction method of the rotary press-fit type steel pipe pile.

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