JP2000144904A - Joint construction between pile and upper structural skeleton in structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide joint construction between a pile and an upper structural skeleton in a structure capable of simplifying arrangements of a pile head or a footing beam and promoting work efficiency and economical efficiency. SOLUTION: The lower surface 16B of a footing beam 16 is located at a position separated upward from the upper end face 12B of a pile head 12A of a cast-in-place concrete pile 12. The lowest floor column 18 is constituted of a steel framed concrete column 32 consisting of a column steel frame 3202 and a concrete 3204. The steel framed concrete column 32 is formed of a cross section smaller than the cross section of the cast-in-place concrete pile 12, the steel framed concrete column 32 vertically passes through the footing beam 16, connection is made between the lower surface 16B of the footing beam 16 and the upper end face 12B of the pile head 12A, and the lower part of the column steel frame 3202 is embedded in the pile head 12A. A ring-shaped space S is ensured between the lower surface 16B of the footing beam 16 and the upper end face 12B of the pile head 12A around the steel framed concrete column 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a pile and a superstructure in a structure, and more particularly, to a cast-in-place concrete pile (in the present invention, a cast-in-place concrete pile is a cast-in-place steel pipe concrete pile). And the upper structure skeleton.

[0002]

2. Description of the Related Art Referring to FIGS. 4 and 5, a joint structure between a pile and an upper structural body thereof in a conventional steel frame concrete structure will be described. FIG. 4 (A)
Is a plan view of the joint between the cast-in-place concrete pile and the superstructure skeleton, FIG. 5 (B) is a front view of the same section, FIG. 5 (A) is a plan view of the joint between the cast-in-place concrete concrete pile and the superstructure skeleton, B) shows the same cross-sectional front view. In the joint structure between the pile and the upper structure skeleton shown in FIG. 4, a pile cap (footing) 1 is attached to the pile head 12A of the cast-in-place concrete pile 12.
4, the cast-in-place concrete pile 12 and the foundation beam 16 are connected via the pile cap 14, and the foundation beam 1 is provided.
6, the lowest floor column 18 made of steel concrete is erected from above. The pile main reinforcement 20 of the cast-in-place concrete pile 12 projects upward from the upper end surface of the pile head 12A and is fixed to the pile cap 14 with a sufficient length, and the steel frame 22 constituting the lowermost pillar 18 is piled. It is embedded in the cap 14.

In the joint structure between a pile and an upper structural body shown in FIG. 5, a pile cap (footing) 14 is provided on a pile head 13A of a cast-in-place steel pipe concrete pile 13, and the pile-in-place is provided via the pile cap 14. The steel pipe concrete pile 13 and the foundation beam 16 are connected to each other, and a lowermost pillar 18 made of steel concrete is erected from above the foundation beam 16. An anchor streak 24 welded to the outer periphery of the upper end of the cast-in-place steel pipe concrete pile 13 projects upward from the upper end surface of the pile head 13A, and has a sufficient length.
4 and a steel frame 22 constituting the lowermost pillar 18.
Are embedded in the pile cap 14.

[0004]

However, in such a conventional joining structure, the pile cap 14 has a steel frame 22 attached thereto.
Is inserted, the beam main bar 1602 is also penetrated or fixed in addition to the pile main bar 20 or the anchor bar 24, and the reinforcing bar 1402 of the pile cap 14 itself is also arranged, so that the reinforcing bar in the pile cap 14 is extremely complicated. State. Further, in the conventional joining structure, the pile heads 12A, 1
3A is integrally connected to the foundation beam 16 via the pile cap 14, and the constraint conditions of the pile heads 12A and 13A are almost fixed. Therefore, when a large horizontal force acts due to seismic force or the like, the pile head 12A. , 13A, a large bending moment is generated, and the pile cap 14 and the foundation beam 16 need to have a corresponding strength. The present invention has been devised in view of the above circumstances, and the present invention reduces the bending moment generated in the pile head and the foundation beam with respect to the horizontal force as compared with the conventional method, so that the vicinity of the pile head is reduced. An object of the present invention is to reduce the amount of reinforcing steel of a pile and a foundation beam, and to simplify the arrangement of reinforcement at a joint between a pile head and a superstructure skeleton.

[0005]

In order to achieve the above object, the present invention relates to a cast-in-place concrete pile, in which an upper structural body is constructed, and the upper structural body has a lowermost column above the cast-in-place concrete pile. In the structure having, the lower surface of the upper structure skeleton is located at a position separated from the upper end surface of the pile head of the cast-in-place concrete pile, and the lowermost pillar vertically penetrates the upper structure skeleton. The lower part of the pillar steel is embedded in the concrete of the pile head of the cast-in-place concrete pile, and the lower part of the upper structural body and the upper end face of the pile head are the pillar steel frame. And a cross section of the column steel frame between a lower surface of the upper structural body and an upper end surface of the pile head is smaller than a cross section of the cast-in-place concrete pile. Further, according to the present invention, a column steel frame portion located above the upper structure skeleton and a column steel frame portion between a lower surface of the upper structure skeleton and an upper end surface of the pile head have the same cross section. It is characterized by being. Also, the present invention provides a structure in which an upper structure skeleton is constructed on a cast-in-place concrete pile, and wherein the upper structure skeleton has a lowest floor column above the cast-in-place concrete pile, wherein the lower surface of the upper structure skeleton is Located at a location separated from the upper end face of the pile head of the cast-in-place concrete pile, the lowermost column is composed of a steel concrete column vertically penetrating the upper structure body, and the steel concrete column is The lower part of the concrete that constitutes is connected to the upper end face of the pile head of the cast-in-place concrete pile, and the lower part of the column steel that constitutes the steel concrete column is embedded in the concrete of the pile head of the cast-in-place concrete pile. The lower surface of the upper structure body and the upper end surface of the pile head are connected by the steel concrete column, the lower surface of the upper structure body and the Cross-section of the steel concrete column between the upper end surface of the head is characterized in that less than the cross-section of the cast-in-place concrete piles. Further, in the present invention, a steel concrete column portion located above the upper structure skeleton and a steel concrete column portion between a lower surface of the upper structure skeleton and an upper end surface of the pile head have the same cross section. It is characterized by doing.
Also, the present invention provides a structure in which an upper structure skeleton is constructed on a cast-in-place concrete pile, and wherein the upper structure skeleton has a lowest floor column above the cast-in-place concrete pile, wherein the lower surface of the upper structure skeleton is Located in a location separated from the upper end face of the pile head of the cast-in-place concrete pile,
The lowermost pillar is composed of a steel reinforced concrete column vertically penetrating the upper structural body, and a lower portion of the concrete constituting the steel reinforced concrete column is connected to an upper end surface of a pile head of the cast-in-place concrete pile. ,
The steel bar and the lower part of the steel column constituting the steel reinforced concrete column are buried in the concrete at the pile head of the cast-in-place concrete pile, and the steel frame is provided between the lower surface of the upper structural body and the upper end surface of the pile head. The cross section of the steel reinforced concrete connected by the reinforced concrete columns and between the lower surface of the upper structural body and the upper end surface of the pile head is smaller than the cross section of the cast-in-place concrete pile. The present invention also provides a steel reinforced concrete column portion located above the upper structure skeleton, and a steel reinforced concrete column portion between a lower surface of the upper structure skeleton and an upper end surface of the pile head. It is characterized by doing. Further, the present invention is characterized in that the upper structure skeleton is a foundation beam or a mat slab.

According to the present invention, the column between the lower surface of the upper structural frame and the upper end surface of the pile head of the cast-in-place concrete pile has a smaller cross-section than that of the cast-in-place concrete pile and constitutes the lowermost column. Connected by steel or steel concrete columns or steel reinforced concrete columns. Therefore, the bending moment generated at the pile head and the foundation beam that forms the superstructure frame is reduced compared to the conventional method in response to the horizontal force, thereby reducing the amount of reinforcing bars in the pile body and foundation beam near the pile head. It is possible to simplify the reinforcement arrangement at the joint between the pile head and the superstructure skeleton.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (A) is a plan view of a joint portion between a cast-in-place concrete pile and a superstructure skeleton, and FIG. 1 (B) is a sectional front view thereof. The steel-frame concrete structure is constructed on a cast-in-place concrete pile 12, and a foundation beam 16 and a lowest floor column 18 are provided on the cast-in-place concrete pile 12. Cast-in-place concrete pile 12
Has a plurality of pile reinforcements 20 extending in the vertical direction and a plurality of pile straps 21 extending in the horizontal direction. The upper ends of the pile reinforcement 20 and the pile straps 213304 are connected to the pile head 12.
A is buried inside A and does not protrude from above the upper end surface 12B of the pile head 12A as in the related art. The lower surface 16B of the foundation beam 16 is the pile head 1 of the cast-in-place concrete pile 12.
It is located at a position separated from the upper end surface 12B of 2A above.

The lowermost column 18 is constituted by a steel concrete column 32 composed of a column steel frame 3202 and concrete 3204. The cross section of the column steel frame 3202 is formed in a cross shape (cross-shaped steel frame) formed by combining two H-section steels. The steel concrete column 32 is a cast-in-place concrete pile 1
2, the steel concrete column 32 penetrates the foundation beam 16 up and down. And
Concrete 320 constituting steel concrete column 32
The lower part of 4 is the pile head 12A of the cast-in-place concrete pile 12.
The lower part of the column steel frame 3202 that is connected to the upper end surface 12B of the steel concrete column 32 is buried in the concrete of the pile head 12A of the cast-in-place concrete pile 12. Therefore, the lower surface 16B of the foundation beam 16 and the upper end surface 12B of the pile head 12A are connected by the steel concrete column 32 having a smaller cross section than the cast-in-place concrete pile 12, and the foundation beam around the steel concrete column 32. An annular gap S is secured between the lower surface 16B of the head 16 and the upper end surface 12B of the pile head 12A.

The depth at which the column steel frame 3202 is buried in the concrete of the pile head 12A, that is, the distance from the upper end surface 12B of the pile head 12A to the lower end of the column steel frame 3202 is:
The length is set to be equal to or longer than the embedded length of the steel frame required for the structural design. In the present embodiment, the cross-sectional shape of the steel concrete column 32 from the upper end surface 12B of the pile head 12A to the upper surface 16A of the foundation beam 16 is different from that of the upper surface 16 of the foundation beam 16.
The cross-sectional shape of the steel concrete column 32 from the upper end surface 12B of the pile head 12A to the lower surface 16B of the foundation beam 16 is the same as the cross-sectional shape of the upper steel frame concrete column 32. Concrete pillar 3
When the cross-sectional performance is changed to the cross-sectional performance of FIG. 2, the cross-sectional shape of the steel concrete column 32 from the upper end surface 12B of the pile head 12A to the upper surface 16A of the foundation beam 16 is changed to the cross-section of the steel concrete column 32 above the upper surface 16 of the foundation beam 16. The shape may be changed.

The shape of the column steel frame 3202 located below the upper surface 16 of the foundation beam 16 is
It is not necessary to match the specification of the steel frame concrete column 32 located above, and it is set to the specification required for the structural design. In addition, the foundation beam 1 around the steel concrete column 32
6 between the lower surface 16B of the pile head 12A and the upper end surface 12B of the pile head 12A, even if the cast-in-place concrete pile 12 is deformed.
The size is set so as not to come into contact with 2B. Further, the steel concrete column 32 between the lower surface 16B of the foundation beam 16 and the upper end surface 12B of the pile head 12A has a cross-sectional area capable of transmitting an axial force and a shear force.

The cast-in-place concrete pile 12 as described above
For example, when the cast-in-place concrete pile 12 is constructed, the pile main reinforcement 20 and the pile band reinforcement 21 are arranged inside the excavated hole, and before the concrete is cast, the column steel frame 3202 is connected. Insert the lower part of the hole into the excavated hole, and then cast concrete. Thereby, the pile head 12
The cast-in-place concrete pile 12 in which the column steel frame 3202 protrudes from the upper end surface 12B of A is obtained. Next, the beam main reinforcement 1602 is arranged above the cast-in-place concrete pile 12, and the lower surface 16B of the foundation beam 16 and the upper end surface 1 of the pile head 12A are arranged.
2B is separated from the concrete formwork for the foundation beam, and the concrete formwork is assembled so as to surround the column steel frame 3202 between the lower surface 16B of the foundation beam 16 and the upper end surface 12B of the pile head 12A. Pour concrete into the concrete formwork.

By placing the concrete, the foundation beam 1
6 and a foundation beam 16 are formed between the lower part 16B of the pile 6 and the upper end surface 12B of the pile head 12A, and the foundation beam 16 is formed. Is supported by a steel concrete column 32 between the lower surface 16B of the foundation beam 16 and the upper end surface 12B of the pile head 12A while being spaced upward from the upper end surface 12B.
Next, assembling the concrete form for the lowermost pillar so as to surround the column steel frame 3202 projecting upward from the upper surface 16A of the foundation beam 16, and placing the concrete inside the concrete form for the lowermost pillar Thus, a steel concrete column 32 above the upper surface 16A of the foundation beam 16 is formed. At the time of placing concrete on concrete formwork for foundation beam,
The concrete formwork for the lowest floor column is assembled to a certain height, and at the same time as the foundation beam 16 is constructed, a steel frame concrete column 32 of a certain height is made. You may make it. The column steel frame 3202 is the foundation beam 1
From the beginning, it is not necessary to have a height sufficient to be connected to the structural building of the upper floor, for example, the lower end of the pile head 1
2A, the upper end of which is embedded in the upper surface 16A of the foundation beam 16.
May be made to protrude to some extent from above, and after the foundation beam 16 is constructed, the column steel frame 3202 may be extended upward.

According to the present embodiment, the gap S is secured around the steel concrete column 32 between the lower surface 16B of the foundation beam 16 and the upper end surface 12B of the pile head 12A of the cast-in-place concrete pile 12. , Cast-in-place concrete pile 12
The cross section performance of the pile head 12A is the lower surface 16B of the foundation beam 16.
Since it depends on the performance of the steel frame concrete column 32 between the pile head 12A and the upper end surface 12B of the pile head 12A, the bending strength of the pile head 12A is lower than that of the conventional method. However, the foundation beam 1 must be designed to have the strength and deformation capacity required for structural design.
By designing the steel concrete column 32 between the lower surface 16B of the pile 6 and the upper end surface 12B of the pile head 12A, the horizontal strength of the cast-in-place concrete pile 12 is not greatly reduced as compared with the conventional construction method. The bending moment generated in the pile head 12A is the bending strength of the pile head 12A, that is, the lower surface 16B of the foundation beam 16 and the upper end surface 12A of the pile head 12A.
B does not exceed the bending strength of the steel concrete column 32.

Therefore, according to the present embodiment, the horizontal strength of the entire cast-in-place concrete pile 12 is not greatly reduced as compared with the conventional construction method, and the vicinity of the pile head 12A in the same horizontal force is smaller than that of the conventional construction method. The amount of rebar can be reduced. Also,
The bending moment generated in the foundation beam 16 is also reduced as compared with the conventional method, so that the foundation beam cross-sectional dimension or the amount of rebar can be reduced.
That is, according to the present embodiment, it is possible to reduce the amount of rebar in the vicinity of the pile head 12A and the foundation beam 16, and since the pile cap is not used unlike the conventional case, the pile head 12A and the foundation beam 16 are not used. Bar arrangement work and assembling work of the concrete formwork can be simplified.

Next, a case where the cast-in-place concrete pile is a cast-in-place steel pipe concrete pile will be described. FIG.
(A) is a plan view of a joint portion between the cast-in-place steel pipe concrete pile and the superstructure skeleton, and (B) is a front view of the same section. The steel concrete structure is constructed on a cast-in-place steel pipe concrete pile 13, and a foundation beam 16 and a lowest floor column 18 are provided on the cast-in-place steel pipe concrete pile 13. In the cast-in-place steel pipe concrete pile 13, a steel pipe 1302 is inserted into a hole excavated in the ground, and a steel pipe 130 is inserted.
2 is formed by casting concrete inside. The lower surface 16B of the foundation beam 16 is located at a position separated from the upper end surface 13B of the pile head 13A of the cast-in-place steel pipe concrete pile 13 above.

The bottom floor column 18 is composed of a steel concrete column 32 composed of a column steel frame 3202 and concrete 3204. The steel frame concrete column 32 is formed with a cross section smaller than the cross section of the cast-in-place steel pipe concrete pile 13. 32 penetrates the foundation beam 16 up and down. The lower part of the concrete 3204 constituting the steel concrete column 32 is the cast-in-place steel pipe concrete pile 1
The lower part of the column steel frame 3202 that is connected to the upper end surface 13B of the third pile head 13A and constitutes the steel concrete column 32 is buried in the concrete of the pile head 13A of the cast-in-place steel pipe concrete pile 13. Therefore, the foundation beam 16
Between the lower surface 16B of the pile head 13A and the upper end surface 13B of the pile head 13A is connected by a steel frame concrete column 32 having a section smaller than that of the cast-in-place steel pipe concrete pile 13, and the lower surface 16B of the foundation beam 16 around the steel frame concrete column 32. An annular gap S is secured between the upper end surface 13B of the pile head 13A.

The above-mentioned connection between the cast-in-place steel pipe concrete pile 13 and the foundation beam 16 is performed, for example, when the cast-in-place steel pipe concrete pile 13 is constructed, before the concrete is poured into the inside of the steel pipe 1302, the column steel 3202. Is inserted into the inside of the steel pipe 1302, and then concrete is cast. Thereby, the cast-in-place steel pipe concrete pile 13 in which the column steel frame 3202 protrudes from the upper end surface 13B of the pile head 13A is obtained. Next, cast-in-place steel pipe concrete pile 1
3, the main beam 1602 is arranged above the base beam 16.
The concrete formwork for the foundation beam is assembled such that the lower surface 16B of the pile head and the upper end surface 13B of the pile head 13A are separated from each other, and a column steel frame 3202 is provided between the lower surface 16B of the foundation beam 16 and the upper end surface 13B of the pile head 13A. Concrete formwork is assembled so as to surround the concrete form, and concrete is cast inside the concrete formwork.

By placing this concrete, the foundation beam 1
6 and the foundation beam 16 are formed between the lower part 16B of the pile 6 and the upper end surface 13B of the pile head 13A, and the foundation beam 16 is formed. Is supported by the steel concrete column 32 between the lower surface 16B of the foundation beam 16 and the upper end surface 13B of the pile head 13A in a state of being separated upward from the upper end surface 13B.
Next, assembling the concrete form for the lowermost pillar so as to surround the column steel frame 3202 projecting upward from the upper surface 16A of the foundation beam 16, and placing the concrete inside the concrete form for the lowermost pillar Thus, a steel concrete column 32 above the upper surface 16A of the foundation beam 16 is formed.

According to such an embodiment, similarly to the above embodiment, the cast-in-place steel pipe concrete pile 13
The amount of rebar near the pile head 13A can be reduced compared to the conventional method for the same horizontal force without significantly lowering the overall horizontal strength as compared with the conventional method, and the bending moment generated in the foundation beam 16 can be reduced. , The cross-sectional dimensions of the foundation beam or the amount of reinforcing steel can be reduced, thereby simplifying the work of arranging the reinforcement of the pile head 13A and the foundation beam 16 and the work of assembling the concrete formwork.

Note that the lowest floor column 18 may be a steel concrete column 32 as in the above embodiment, a column steel frame without concrete, a steel frame reinforced concrete column, or the like. The invention applies in all these cases. Further, the cross-sectional shape of the lowest floor column 18, the cross-sectional shape of the column steel frame, the arrangement of the reinforcing bars, and the like are also arbitrary. Other shapes of the lowermost pillar 18 will be described with reference to FIGS. FIG. 3A shows a case where the lowest floor column 18 is a steel reinforced concrete column 52 having a rectangular cross section. A square steel pipe 5202 is disposed at the center of the cross section, and column main reinforcements 5204 are provided outside the four corners. Arranged, square steel pipe 5
Concrete 5206 is cast inside and outside of 202. FIG. 3B shows the lowermost pillar 18.
However, the cross section is a rectangular steel frame reinforced concrete column 54, a cross-shaped steel frame 5402 is disposed at the center of the cross section, and three column main reinforcing bars 5404 are disposed outside the four corners, respectively. 5406 is formed.

FIG. 3C shows a case where the lowermost column 18 is a steel concrete column 56 having a rectangular cross section. The concrete column 5604 is cast inside a square steel pipe 5602. . The lowermost column 18 in FIG. 3D is a case where the cross section described in the embodiment of FIGS. 1 and 2 is a rectangular steel frame concrete column 32, and a cross-shaped steel frame 3202.
Is constructed by casting concrete 3204 on the outside. FIG. 3 (E) shows a case where the lowest floor column 18 is formed only of a columnar steel frame 58 having a rectangular cross section, and a square steel pipe is used as the columnar steel frame 58. FIG. 3 (F) shows the lowermost pillar 1
Numeral 8 is a case where the column steel frame 60 is composed of only the column steel frame 60, and a cross-shaped steel frame is used as the column steel frame 60. Note that the cross-sectional shape of the lowermost pillar 18 between the lower surface of the foundation beam and the upper end surface of the pile head may be the same as or different from the cross-sectional shape of the lowermost column above the upper surface of the foundation beam. Good. Further, in the above embodiment, the case where the upper structure skeleton is a foundation beam has been described, but the present invention is also applied to a case where the upper structure skeleton is a mat slab or the like.

[0022]

As is apparent from the above description, according to the joint structure of the pile and the upper structure skeleton in the structure of the present invention, the lower surface of the upper structure skeleton and the cast-in-place concrete pile (the cast-in-place concrete in the present invention) The concrete pile includes a cast-in-place steel pipe concrete pile) and the upper end face of the pile head is connected by a lowermost column having a section smaller than that of the cast-in-place concrete pile. Therefore, the bending moment generated at the pile head and the foundation beam that forms the superstructure frame is reduced compared to the conventional method in response to the horizontal force, thereby reducing the amount of reinforcing bars in the pile body and foundation beam near the pile head. It is possible to simplify the reinforcement arrangement at the joint between the pile head and the superstructure skeleton.

[Brief description of the drawings]

FIG. 1A is a plan view of a joint between a cast-in-place concrete pile and a superstructure skeleton, and FIG. 1B is a front sectional view of the same.

FIGS. 2A and 2B are explanatory diagrams when joining a cast-in-place steel pipe concrete pile and a superstructure skeleton.

FIGS. 3A to 3F are cross-sectional views of other shapes of the lowermost pillar, respectively.

FIG. 4 (A) is a plan view of a joint portion between a conventional cast-in-place concrete pile and a superstructure skeleton, and FIG. 4 (B) is a sectional front view thereof.

FIG. 5A is a plan view of a joint portion between a conventional cast-in-place steel pipe concrete pile and a superstructure skeleton, and FIG. 5B is a sectional front view thereof.

[Explanation of symbols]

 12 Cast-in-place concrete pile 13 Cast-in-place steel pipe concrete pile 16 Foundation beam 18 Bottom floor column 32 Steel frame concrete column

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Katsumi Kobayashi 4-6-115 Sendagaya, Shibuya-ku, Tokyo Inside Fujita Co., Ltd. (72) Inventor Takahiro Maru 4-6-115 Sendagaya, Shibuya-ku, Tokyo Stock Company F term in the company Fujita (reference) 2D041 AA01 BA19 CA01 CB05 DA01 2D046 AA12 AA15 CA01

Claims (7)

[Claims] An upper structure is constructed on a cast-in-place concrete pile, wherein the upper structure has a lower floor column above the cast-in-place concrete pile. It is located at a position separated from the upper end face of the pile head of the cast-in-place concrete pile, and the lowermost column is constituted by a column steel frame vertically penetrating the upper structural body, and a lower portion of the column steel frame is Embedded in the concrete at the pile head of the cast-in-place concrete pile, the lower surface of the upper structure skeleton and the upper end surface of the pile head are connected by the column steel frame, and the lower surface of the upper structure skeleton and the pile head A cross section of the column steel frame between the upper end face of the section and the cross section of the cast-in-place concrete pile, wherein the pile and the upper structure skeleton in the structure are characterized. 2. A pillar steel frame portion located above the upper structure body, and a column steel frame portion between a lower surface of the upper structure body and an upper end surface of the pile head have the same cross section. The joint structure between a pile and an upper structural body in the structure according to claim 1, wherein: 3. A structure in which an upper structure skeleton is constructed on a cast-in-place concrete pile, wherein the upper structure skeleton has a lower floor column above the cast-in-place concrete pile. The lowermost pillar is located at a position separated from the upper end face of the pile head of the cast-in-place concrete pile above the upper end face, and the lowermost pillar is constituted by a steel concrete pillar vertically penetrating the upper structural body, and constitutes the steel concrete pillar. The lower part of the concrete to be cast is connected to the upper end face of the pile head of the cast-in-place concrete pile, and the lower part of the column steel frame constituting the steel concrete column is buried in the concrete of the pile head of the cast-in-place concrete pile. A lower surface of the upper structure body and an upper end surface of the pile head are connected by the steel concrete column, and a lower surface of the upper structure body and the lower surface of the pile structure are connected to each other. Junction structure of the cross section of the steel concrete column is less than the cross section of the cast-in-place concrete pile, the pile and the upper structural framework in the structure, characterized in that between the upper end surface of the head. 4. A steel concrete column portion located above the superstructure skeleton and a steel concrete column portion between a lower surface of the superstructure skeleton and an upper end surface of the pile head have the same cross section. 4. The method according to claim 3, wherein
A joint structure between a pile and a superstructure skeleton in the structure described in the above. 5. A structure in which an upper structure skeleton is constructed on a cast-in-place concrete pile, wherein the upper structure skeleton has a lower floor column above the cast-in-place concrete pile. The lowermost pillar is located at a position separated from the upper end face of the pile head of the cast-in-place concrete pile above the upper end face, and the lowermost pillar is constituted by a steel reinforced concrete pillar vertically penetrating the upper structural body, and constitutes the steel reinforced concrete pillar. The lower part of the concrete to be connected is connected to the upper end face of the pile head of the cast-in-place concrete pile, and the lower part of the reinforcing steel and column steel constituting the steel-framed reinforced concrete column is embedded in the concrete of the pile head of the cast-in-place concrete pile. Embedded between the lower surface of the upper structure body and the upper end surface of the pile head by the steel-framed reinforced concrete column; Junction structure of the steel reinforced concrete cross-section smaller than the cross section of the cast-in-place concrete pile, the pile and the upper structural framework in the structure, characterized in that between the lower surface and the upper surface of the pile head of the structural framework. 6. A steel reinforced concrete column located above the upper structure skeleton, and a steel reinforced concrete column between a lower surface of the upper structure and an upper end surface of the pile head have the same cross section. The joint structure between a pile and a superstructure skeleton in the structure according to claim 5, wherein 7. The joint structure between a pile and an upper structural body in a structure according to claim 1, wherein the upper structural body is a foundation beam or a mat slab.