JP7233295B2 - Pile head connection structure and foundation structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pile head joint structure and a foundation structure.

As a structure that integrates the steel pipe piles with the foundation structure including the underground beams and footings of the building, fixing reinforcing bars are provided and outer steel pipes with an outer diameter of about 1.5 times the outer diameter of the steel pipe piles are used. A structure is known in which a steel pipe pile is installed radially outside of the pile head and filled with concrete between the pile head and the outer steel pipe.
As an example of the structure, Patent Document 1 describes a structure in which the outer steel pipe is formed in an octagonal cylindrical shape, and the pile head and the outer steel pipe are connected by a plurality of plate-shaped vertical ribs radially extending from the pile head. ing. According to the structure described in Patent Document 1, compared to the structure in which the outer steel pipe is circular and the anchoring reinforcing bars are arranged on the circumference, the anchoring reinforcing bars joined to the outer steel pipe interfere with the reinforcing bars on the foundation side. is less likely to occur, making it easier to construct the foundation structure.

Further, Patent Document 2 describes a structure in which interference between anchoring reinforcing bars joined to the outer steel pipe and reinforcing bars on the foundation side is less likely to occur by forming the outer steel pipe into a rectangular tubular shape.

Japanese Unexamined Patent Application Publication No. 2006-83609 JP 2006-104886 A

However, the structure described in Patent Literature 1 has a problem that it is not easy to join the vertical rib between the octagonal outer steel pipe and the pile head, and the manufacturing cost increases.
In addition, in the structure described in Patent Document 2, it is difficult to secure the rigidity of the square tube-shaped outer steel pipe compared to the cylindrical outer steel pipe, and it is necessary to increase the thickness of the steel material used, so the manufacturing cost is increased. There is the issue of increasing

INDUSTRIAL APPLICABILITY The present invention provides a pile head joint structure and a foundation structure that can ensure high workability and high rigidity in a joint structure that integrates the pile head of a steel pipe pile and the foundation of a structure. intended to

According to one aspect of the present invention, a joint structure for a pile head is a joint structure for joining the pile head of a steel pipe pile to a foundation of a structure, wherein the steel pipe is radially outward of the pile head. A cylindrical outer steel pipe portion arranged concentrically with the pile; a plurality of plate members inscribed in the outer steel pipe portion; a fixing portion that is pulled out and fixed to the foundation of the structure; and a hardening material that is filled at least between the plurality of plate members and the pile head.

In the pile head joint structure, the plurality of plate members may be combined to form a polygonal shape including at least one pair of parallel opposite sides.

Further, in the pile head joint structure, the polygonal shape may be a rectangular shape or an octagonal shape.

In the pile head joint structure, a through hole may be formed in at least one of the plurality of plate members.

Further, in the pile head joint structure, the fixing portion may be a fixing reinforcing bar that is joined to the plate member and extends upward from the upper end of the outer steel pipe portion. Further, the fixing portion may be an extension portion in which the plate member extends above the upper end of the outer steel pipe portion, and a through hole may be formed in the extension portion.

In addition, the pile head joint structure may include a diaphragm that closes at least a portion between the lower ends of the plurality of plate members and the side surface of the steel pipe pile.

According to another aspect of the present invention, the foundation structure includes any one of the pile head joint structures, the foundation reinforcing bars extending along the anchoring portion, and the anchoring portion and the foundation reinforcing bars. and a footing comprising concrete that is reinforced.

According to the above configuration, the fixing portions are arranged in a straight line by providing the fixing portions on the plurality of flat plate members. As a result, interference between the reinforcing bars extending linearly on the foundation side and the fixing portion is avoided, and the workability of the foundation structure can be improved.
In addition, since the outer steel pipe portion and the plurality of plate members mutually reinforce each other, a highly rigid structure having the integrated outer steel pipe portion and the plurality of plate members can be obtained.

It is a perspective view of the joint structure of the pile head which concerns on the 1st Embodiment of this invention. It is a sectional side view of the joining structure of the pile head which concerns on the 1st Embodiment of this invention. It is a simplified plan view explaining arrangement|positioning of the plate member of the joining structure of the pile head and anchoring reinforcing bar which concern on the 1st Embodiment of this invention. 1 is a longitudinal sectional view of a foundation structure using a joint structure for pile heads according to a first embodiment of the present invention; FIG. 1 is a plan view of a foundation structure using a pile head joint structure according to a first embodiment of the present invention; FIG. FIG. 6 is a simplified plan view illustrating the arrangement of plate members and fixing reinforcing bars of the joint structure of the pile head according to another form of the first embodiment of the present invention. FIG. 6 is a simplified plan view illustrating the arrangement of plate members and fixing reinforcing bars of the joint structure of the pile head according to another form of the first embodiment of the present invention. FIG. 6 is a side cross-sectional view illustrating a method of joining anchoring reinforcing bars of the joining structure of the pile head according to another form of the first embodiment of the present invention. FIG. 6 is a simplified plan view illustrating the arrangement of plate members and fixing reinforcing bars of the joint structure of the pile head according to another form of the first embodiment of the present invention. FIG. 6 is a simplified plan view illustrating the arrangement of plate members and fixing reinforcing bars of the joint structure of the pile head according to another form of the first embodiment of the present invention. FIG. 6 is a simplified plan view illustrating the arrangement of plate members and fixing reinforcing bars of the joint structure of the pile head according to another form of the first embodiment of the present invention. FIG. 6 is a simplified plan view illustrating the arrangement of plate members and fixing reinforcing bars of the pile head joint structure according to still another form of the first embodiment of the present invention. It is a perspective view of the joining structure of the pile head which concerns on the 2nd Embodiment of this invention. It is a vertical cross-sectional view of the foundation structure using the joining structure of the pile head which concerns on the 2nd Embodiment of this invention.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.

(First embodiment)
FIG. 1 is a perspective view of a joint structure for pile heads according to a first embodiment of the present invention. FIG. 2 is a side sectional view of the joint structure of the pile head. A pile head joint structure 1 of the present embodiment is a structure for joining a pile head 3 of a steel pipe pile 2 to a foundation of a structure such as a building with a hierarchical structure. FIG. 2 corresponds to a sectional view taken along line II--II of FIG.
As shown in FIGS. 1 and 2 , the pile head joint structure 1 includes a cylindrical outer steel pipe portion 4 disposed radially outside the steel pipe pile 2 and an outer steel pipe portion 4 radially outside the steel pipe pile 2 . Filling between the polygonal pipe portion 5 arranged radially inside the portion 4 and between the outer steel pipe portion 4 and the polygonal pipe portion 5 and between the polygonal pipe portion 5 and the pile head portion 3 of the steel pipe pile 2 and a hardened concrete 6 (hardener). In addition, illustration of the concrete 6 is abbreviate|omitted in FIG.
The outer steel pipe portion 4 and the polygonal pipe portion 5 are joined by welding. Moreover, the polygonal pipe portion 5 and the steel pipe pile 2 behave integrally with respect to stress in the horizontal direction via the concrete 6 filled between them.

The outer steel pipe portion 4 has a cylindrical shape and is arranged radially outside the pile head portion 3 so as to be concentric with the steel pipe pile 2 . In the illustrated example, the outer steel pipe portion 4 is arranged such that the height of the upper end of the outer steel pipe portion 4 and the height of the upper end of the steel pipe pile 2 are substantially the same.

The polygonal tube portion 5 is a polygonal cylinder-shaped member that is combined to form an octagonal shape (polygonal shape) that is inscribed in the outer steel pipe portion 4 . The polygonal tube portion 5 has eight flat plate-like plate members 8 forming octagonal sides, and a plurality of fixing reinforcing bars 9 (fixing portions) joined to the plate members 8 . Each plate member 8 is a steel plate, and a side 81 of the steel pipe pile 2 extending in the pipe axial direction z is joined to the inner peripheral surface of the outer steel pipe portion 4 by welding, for example. In the illustrated example, the length of the plate member 8 in the pipe axis direction z is substantially the same as the length of the outer steel pipe portion 4 in the pipe axis direction z. 1 and 2, the fixing reinforcing bar 9 is joined inside the plate member 8, but it may be joined outside the plate member 8. FIG.

As will be described later, in the present embodiment, the plate members 8 include first plate members 8A and second plate members 8B alternately arranged in the circumferential direction of the steel pipe pile 2 . The first plate member 8A and the second plate member 8B are joined together. The fixing reinforcing bar 9 is joined to the upper portion of the first plate member 8A by, for example, welding, and extends above the upper ends of the steel pipe pile 2 and the outer steel pipe portion 4 in the pipe axial direction z. Further, as shown in FIG. 1, each first plate member 8A is formed with a plurality of (nine in this embodiment) circular through-holes 82. As shown in FIG. The through-holes 82 are regularly arranged throughout the rectangular first plate member 8A. By filling the through-holes 82 with the concrete 6 as well, the adhesion between the concrete 6 and the first plate member 8A can be improved. Moreover, when the concrete 6 is filled, the concrete 6 passes through the through holes 82, so that the concrete 6 can be filled more efficiently.

Further, as shown in FIG. 2 , the pile head joint structure 1 has a diaphragm 10 arranged to block the space between the lower end of the outer steel pipe portion 4 and the side surface of the steel pipe pile 2 . The diaphragm 10 is made of, for example, a disc-shaped steel plate and is joined to the lower end of the outer steel pipe portion 4 . The steel pipe pile 2 is inserted inside a through hole 10A formed in the center of the diaphragm 10 . By providing the diaphragm 10, the concrete 6 can be stably filled. In addition, by providing a predetermined gap between the through-hole 10A and the steel pipe pile 2, the construction error of the steel pipe pile 2 is absorbed, and the outer steel pipe portion 4 and the plate member 8 are aligned with the foundation reinforcing bars of the structure, for example. can be placed in position.

FIG. 3 is a simplified plan view for explaining the arrangement of the plate member 8 and anchoring reinforcing bars 9 of the joint structure 1 of the pile head. FIG. 3 corresponds to a view taken along arrow III in FIG. As shown in FIG. 3, the polygonal tube portion 5 of this embodiment has an octagonal shape when viewed from above. When viewed from above, the polygonal pipe portion 5 includes four first plate members 8A arranged at regular intervals in the circumferential direction of the steel pipe pile 2, and four first plate members 8A arranged between the first plate members 8A adjacent in the circumferential direction. and two plate members 8B. The width of the second plate member 8B (the width in the direction of two of the four sides perpendicular to the tube axial direction z) is smaller than the width of the first plate member 8A.
The four first plate members 8A are composed of a pair of first plate members 8A1 forming parallel opposite sides in the octagonal shape, and a pair of first plate members 8A1 orthogonal to the first plate member 8A1 and forming other parallel opposite sides in the octagonal shape. It is composed of a pair of first plate members 8A2.

In the example shown in FIG. 3, the fixing reinforcing bars 9 are joined to the respective first plate members 8A at regular intervals in the width direction of the first plate members 8A. For example, four fixing reinforcing bars 9 are joined to the inner surface (the side facing the steel pipe pile 2) of each first plate member 8A.

(Foundation structure using joint structure of pile head)
4 and 5 are a vertical cross-sectional view and a plan view of a foundation structure using the pile head joint structure 1 according to the embodiment of the present invention. 5 corresponds to a view taken along the line VV in FIG. 4, and FIG. 4 corresponds to a sectional view taken along the line IV-IV in FIG.
As shown in FIGS. 4 and 5, the foundation structure 50 includes steel pipe piles 2, joint structures 1, foundation reinforcing bars 51, and foundation concrete 6A. In addition, in FIG. 5, the foundation concrete 6A is not illustrated for description.

The foundation reinforcing bars 51 and the foundation concrete 6A are foundation members made of reinforced concrete of the structure, and form, for example, a portion called footing. In the illustrated example, the foundation reinforcing bars 51 are arranged in a grid-like planar arrangement, and each reinforcing bar extends linearly.

The fixing reinforcing bars 9 of the joint structure 1 of the pile head extend to the inside of the basic concrete 6A through between the foundation reinforcing bars 51 . The foundation concrete 6A and the steel pipe pile 2 are connected to each other by fixing the fixing reinforcing bars 9 in the foundation concrete 6A. As described above, in the joint structure 1, the first plate members 8A are arranged so as to form two sets of parallel opposite sides that are perpendicular to each other. Accordingly, the fixing reinforcing bars 9 joined to the first plate member 8A are also arranged in a straight line along two sets of parallel opposite sides that are perpendicular to each other. As a result, interference between the linearly extending foundation reinforcing bars 51 and the anchoring reinforcing bars 9 can be avoided, and the workability of the basic structure 50 can be improved.

(Construction method of foundation structure)
Next, a construction method of the foundation structure 50 using the joint structure 1 of the pile head according to the embodiment of the present invention will be described.
First, the polygonal tube portion 5 is manufactured at a facility other than the site such as a factory. The polygonal pipe portion 5 is formed by welding a plurality of plate members 8 to the inner peripheral surface of the outer steel pipe portion 4 so as to form an octagonal shape. At this time, the outer steel pipe portion 4 functions as an assembly jig, which facilitates forming the polygonal pipe portion 5 into an octagonal shape.
Next, the fixation reinforcing bar 9 is joined to the first plate member 8A of the polygonal tube portion 5 . Next, the diaphragm 10 is joined to the outer steel pipe portion 4 . Incidentally, the diaphragm 10 may or may not be joined to the plate member 8 .

Next, in construction at the site, after excavating the periphery of the steel pipe pile 2 driven into the ground, the integrated outer steel pipe portion 4 and polygonal pipe portion 5 are arranged radially outside the pile head portion 3. Then, concrete 6 is filled between the outer steel pipe portion 4 and the steel pipe pile 2 .
Next, a foundation structure 50 including foundation reinforcing bars 51 and foundation concrete 6A is constructed. The step of filling the space between the outer steel pipe portion 4 and the steel pipe pile 2 with the concrete 6 is omitted. Concrete 6 can also be filled between the piles 2 .

According to the first embodiment of the present invention as described above, since the anchoring reinforcing bars 9 are spaced apart from the pile head 3 and arranged radially outside of the pile head 3, the anchoring reinforcing bars 9 are not densely distributed. You can avoid becoming streaks.
Further, the anchoring reinforcing bars 9 are arranged in a straight line by joining the anchoring reinforcing bars 9 to the plate-like first plate member 8A. As a result, interference between the linearly extending foundation reinforcing bars 51 and the anchoring reinforcing bars 9 is avoided, and the workability of the basic structure 50 can be improved.

In addition, since the outer steel pipe portion 4 functions as an assembly jig when forming the polygonal pipe portion 5, the polygonal pipe portion 5 can be more easily assembled. In addition, since the outer steel pipe portion 4 and the polygonal pipe portion 5 are mutually reinforcing, the outer steel pipe portion 4 and the polygonal pipe portion 5 can have a highly rigid structure. Further, since the plate members 8 adjacent to each other in the circumferential direction of the steel pipe pile 2 are joined together, higher rigidity can be obtained.
In addition, when the foundation structure 50 is constructed, the steel pipe pile 2 and the outer steel pipe portion 4 and the polygonal pipe portion 5 are not directly welded, and the concrete 6 is placed between the steel pipe pile 2 and the outer steel pipe portion 4 and the polygonal pipe portion 5. By setting it as the structure to be filled, the installation error of the steel pipe pile 2 can be permitted, and workability improves.

In addition, in the above embodiment, the plurality of plate members 8 are combined in a polygonal shape, but the configuration is not limited to this, and the plurality of plate members 8 may be separated from each other. Even with such a configuration, the anchoring reinforcing bars 9 are joined to the plate-shaped plate member 8 so that the anchoring reinforcing bars 9 are arranged in a straight line, and interference between the linearly extending base reinforcing bars 51 and the anchoring reinforcing bars 9 is prevented. is avoided.
In this case, the diaphragm 10 may block at least part of the space between the lower ends of the plurality of plate members 8 and the side surface of the steel pipe pile 2 .

In addition, in the pile head joint structure 1 according to the above-described embodiment, the fixing reinforcing bar 9 is joined to the inner side of the first plate member 8A, but the present invention is not limited to this. For example, as shown in FIG. 6, the fixing reinforcing bar 9 may be joined to the outside of the first plate member 8A (the side facing the outer steel pipe portion 4).
According to such a configuration, the fixing reinforcing bar 9 can be further separated from the steel pipe pile 2 .

Moreover, in the above-described embodiment, the fixing reinforcing bar 9 is joined to the first plate member 8A, but it is not limited to this. For example, as shown in FIG. 7, anchoring reinforcing bars 9 may be joined to the second plate member 8B. At this time, the second plate member 8B constitutes two sets of parallel opposite sides orthogonal to each other.
As described above, when the pile head portion 3 of the steel pipe pile 2 is joined to the foundation of the structure, the arrangement of the anchoring reinforcing bars 9 may be changed as appropriate as long as it can function as an anchoring portion anchored to the foundation. For example, the fixing reinforcing bars 9 may be joined to both the first plate member 8A and the second plate member 8B, or may be joined to both inner and outer surfaces of the plate member 8 .

Alternatively, as shown in FIG. 8, the fixing reinforcing bar 9 may be joined to the plate member 8 via a coupler 14 instead of being joined directly. That is, the coupler 14, which is a joint having a screw hole, may be joined to the plate member 8, and the fixing reinforcing bar 9 may be screwed into the coupler 14 on site to integrate them.
By joining the fixing reinforcing bars 9 and the plate members 8 via the couplers 14 in this way, the outer steel pipe portion 4 and the polygonal pipe portion 5 are manufactured at a facility other than the site such as a factory, and then transported to the site. Since it is not bulky at the time, transportation efficiency can be improved.

Further, in the above-described embodiment, an example in which the polygonal tube portion 5 has a convex polygonal shape has been described, but the polygonal tube portion 5 may have a concave polygonal shape. For example, as shown in FIG. 9, a member 8C (for example, angle steel) having an L-shaped cross section may be arranged as an alternative to the second plate member 8B of the first embodiment. Also in this case, the polygonal tube portion 5 has a polygonal shape, and two sets of parallel opposite sides are formed by the first plate member 8A.
Alternatively, as shown in FIG. 10, a member 8D having an arched cross section (for example, a split tube) may be employed as an alternative to the second plate member 8B of the first embodiment. By adopting the arch-shaped member 8D, more anchoring reinforcing bars 9A can be arranged at positions that do not interfere with the foundation reinforcing bars 51. As shown in FIG.
In the case of FIG. 10, the planar shape of the polygonal tubular portion 5 includes curved portions and is not strictly a geometrical polygonal shape. Since it is linear, the anchoring reinforcing bars 9 are arranged in a straight line, and interference between the linearly extending base reinforcing bars 51 and the anchoring reinforcing bars 9 is avoided. Also, the anchoring reinforcing bars 9 arranged in the curved portion may be arranged so as not to interfere with the foundation reinforcing bars 51, for example, like the second plate member 8B described above.
In each of the above embodiments, the members 8 forming the polygonal pipe portion 5 are joined to each other, but the members 8 adjacent to each other in the circumferential direction of the steel pipe pile 2 do not necessarily have to be in contact with each other. That is, as shown in FIG. 11, the members 8 adjacent to each other in the circumferential direction of the steel pipe pile 2 may be separated from each other.

Further, in each of the above embodiments, the through holes 82 are formed in the first plate member 8A. You may fill between the polygonal pipe part 5 and the pile head 3 of the steel pipe pile 2, respectively. Moreover, the concrete 6 does not need to be filled both between the outer steel pipe portion 4 and the polygonal pipe portion 5 and between the polygonal pipe portion 5 and the pile head portion 3 of the steel pipe pile 2. The space between the rectangular pipe portion 5 and the pile head portion 3 of the steel pipe pile 2 may be filled.
In each of the above-described embodiments, the fixing reinforcing bars 9 are evenly arranged in the circumferential direction of the steel pipe pile 2, but they may be arranged unevenly according to the structure of the structure to be joined. Specifically, for example, in the vicinity of the edge of the planar shape of the structure, a smaller number of fixing reinforcing bars 9 may be joined to the plate member 8 closer to the edge and a larger number to the plate member 8 farther from the edge.

FIG. 12 is a simplified plan view for explaining the arrangement of plate members and fixing reinforcing bars of the joint structure of the pile head according to still another form of the first embodiment of the present invention.
In the example shown in FIG. 12, the polygonal pipe portion 5A is a cylindrical member that is combined to form a quadrangular shape inscribed with the outer steel pipe portion 4. In the example shown in FIG. More specifically, the polygonal tube portion 5A has four plate members 8E that form the sides of the quadrangle, and fixing reinforcing bars 9 that are joined to the plate members 8E.
In the illustrated example, the polygonal tube portion 5A has a square shape, but the polygonal tube portion 5A may have any rectangular shape. For example, the polygonal tube portion 5A may have a rectangular shape.

(Second embodiment)
FIG. 13 is a perspective view of the joint structure of the pile head according to the second embodiment of the present invention. The configuration of this embodiment is the same as that of the first embodiment except for the first plate member 8F shown in FIG. 13, so redundant detailed description will be omitted.
As shown in FIG. 13, the polygonal tube portion 5B of the pile head joint structure 1B of the present embodiment has an octagonal shape like the polygonal tube portion 5 of the first embodiment, but the first plate The member 8F is formed with an extension portion 12 extending upward from the upper end of the outer steel pipe portion 4, and the extension portion 12 is formed with a plurality of through holes 13. As shown in FIG.

FIG. 14 is a longitudinal sectional view of a base structure using the joint structure 1B shown in FIG. 13. FIG. As shown in FIG. 12, an extension 12 is formed in the first plate member 8F of the pile head joint structure 1B of this embodiment, and the extension 12 extends to the inside of the foundation concrete 6A. By filling the through holes 13 with the basic concrete 6A, the first plate member 8F including the extension portions 12 can be fixed in the basic concrete 6A. The foundation reinforcing bars 51 may be arranged so as to be inserted through the through holes 13 formed in the extension portion 12 . In the present embodiment, since the extension portion 12 formed on the first plate member 8F functions as a fixing portion, the fixing reinforcing bar need not be joined to the first plate member 8F. As a result, the number of parts of the pile head joint structure 1B can be reduced, and the manufacturing cost can be reduced. In other embodiments, the plate member may be formed with an extension and the anchoring rebar may be joined to the plate member having the extension or to another plate member.

Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention belongs can conceive of various modifications or modifications within the scope of the technical idea described in the claims. It is understood that these also naturally belong to the technical scope of the present invention.
For example, in each of the above embodiments, the concrete 6 is filled between the steel pipe pile 2 and the outer steel pipe portion 4 as a hardening material. Application is also possible.

DESCRIPTION OF SYMBOLS 1, 1A, 1B... Joint structure, 2... Steel pipe pile, 3... Pile head, 4... Outer steel pipe part, 5, 5A, 5B... Polygonal pipe part, 6... Concrete, 6A... Foundation concrete, 8... Plate member , 8A... First plate member, 8B... Second plate member, 9... Fixing reinforcing bar (fixing part), 10... Diaphragm, 10A... Through hole, 12... Extension part, 13... Through hole, 14... Coupler, 50... Foundation Structure, 51... Foundation reinforcing bar, 81... Side, 82... Through hole, z... Pipe axis direction.

Claims (8)

A joint structure for joining the pile head of a steel pipe pile to the foundation of a structure,
a cylindrical outer steel pipe portion arranged concentrically with the steel pipe pile radially outward of the pile head;
a plurality of plate members inscribed in the outer steel pipe portion;
a fixing portion extending upward from the plurality of plate members and fixed to the base of the structure;
a hardening material filled between at least the plurality of plate members and the pile head;
Joint structure of the pile head comprising a. The joint structure of the pile head according to claim 1, wherein the plurality of plate members are combined to form a polygonal shape including at least one pair of parallel opposite sides when viewed from above . The pile head joint structure according to claim 2, wherein the polygonal shape is a rectangular shape or an octagonal shape. The joint structure of the pile head according to any one of claims 1 to 3, wherein a through hole is formed in at least one of the plurality of plate members. The joining structure of the pile head according to any one of claims 1 to 4, wherein the fixing portion is a fixing reinforcing bar that is joined to the plate member and extends upward from the upper end of the outer steel pipe portion. The fixing portion is an extension portion in which the plate member extends above the upper end of the outer steel pipe portion,
The joining structure of the pile head according to any one of claims 1 to 4, wherein a through hole is formed in the extension. The pile head joint structure according to any one of claims 1 to 6, further comprising a diaphragm that closes at least a portion between the lower ends of the plurality of plate members and the side surface of the steel pipe pile. A pile head joint structure according to any one of claims 1 to 7;
a footing including a foundation reinforcing bar extending along the anchorage and concrete placed in an area including the anchorage and the foundation reinforcing bar;
Substructure with

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