JP7101109B2 - Pile connection strut structure and its construction method - Google Patents

Description

The present invention relates to a pile connecting strut structure and a construction method thereof, and is particularly applicable to a pile connecting strut structure in which a strut is connected to a pile installed in the ground (underground) via a connecting portion and a construction method thereof. It is about effective technology.

Building structures and civil engineering structures include structures in which columns are connected to piles installed in the ground via connecting portions (hereinafter referred to as pile connecting column structures). Various structures have been proposed and put into practical use in the connecting portion of this pile connecting column structure. For example, in Patent Document 1, one end side of a steel pipe column is inserted (inserted) into the inside from one end side of a steel pipe pile installed in the ground, and the inner peripheral surface of the steel pipe pile and the outer peripheral surface of the steel pipe column are inserted. A technique for constructing a connecting portion by filling a filling portion (separation portion) between the two with concrete as a filler is disclosed. According to the connecting portion of Patent Document 1, the construction period and the construction cost can be significantly reduced as compared with the case where the steel pipe pile and the steel pipe column are connected by bolts or welding.

Japanese Unexamined Patent Publication No. 2012-52383

However, since the connecting portion of Patent Document 1 has a structure in which the steel pipe column is inserted inside the steel pipe pile, it is necessary to use a steel pipe pile having an outer diameter larger than the outer diameter of the steel pipe column. Further, since the connecting portion of Patent Document 1 has a structure in which concrete is filled in the filling portion between the inner peripheral surface of the steel pipe pile and the outer peripheral surface of the steel pipe column, the outer diameter is increased according to the width of the filling portion. It was necessary to use a steel pipe pile larger than the outer diameter of the steel pipe column. In particular, in order to widen the width of the filling portion so that concrete can be filled smoothly, it is necessary to use a steel pipe pile having an outer diameter sufficiently larger than the outer diameter of the steel pipe column. That is, in the connecting portion of Patent Document 1, it is necessary to select a steel pipe pile having an outer diameter larger than the outer diameter of the steel pipe column, which increases the material cost of the steel pipe pile. In addition, the diameter of the excavation hole for installing the steel pipe pile in the ground needs to be increased according to the size of the outer diameter of the steel pipe pile, and the installation cost of the steel pipe pile also increases. The increase in material cost and installation cost of this steel pipe pile means an increase in the cost of the pile connecting strut structure and the building structure and civil engineering structure equipped with this pile connecting strut structure, so it is improved from the viewpoint of cost reduction. There was room for.

In addition to steel pipe piles, concrete piles are known as piles to be installed in the ground, but these concrete piles are thicker (thickness) than steel pipe piles and compared to steel pipe piles with the same outer diameter. Since the inner diameter is small, it is necessary to select a concrete pile having a larger outer diameter according to the outer diameter of the column, and it is difficult to use the concrete pile at the connecting portion of Patent Document 1.

Therefore, the present inventors have focused on the connecting portion for connecting the columns to the piles, and have made the present invention.
An object of the present invention is to provide a technique capable of reducing the cost of a pile connecting column structure.

The pile connecting column structure according to one aspect of the present invention includes a pile installed in the ground and a column connected to one end side of the pile via a connecting portion. The connecting portion is connected to a connecting pipe in which one end side of the pile is inserted inside from one end portion in the longitudinal direction and one end side of the column is inserted inside from the other end portion on the opposite side to the one end portion in the longitudinal direction. In the pipe, it is provided with a filler filled between the pile and the column and the connecting pipe, and between the pile and the column.

Further, in the method of constructing the pile connecting column structure according to one aspect of the present invention, one end side of the pile installed in the ground is inserted into the inside from one end in the longitudinal direction of the connecting pipe to form the connecting pipe on the ground. The process of installing and the process of inserting one end of the column into the connecting pipe from the other end on the opposite side of the longitudinal direction of the connecting pipe installed on the ground and installing the column on the pile. A step of filling the filler between the pile and the column and the connecting pipe and between the pile and the column and hardening the filler is provided.

According to one aspect of the present invention, it is possible to reduce the cost of the pile connecting column structure.

It is a figure which shows the whole structure of the pile connecting column structure which concerns on Embodiment 1 of this invention. It is sectional drawing of the main part which shows the cross-sectional structure along the longitudinal direction of the connecting part of FIG. It is sectional drawing of the main part which enlarged a part of FIG. The figure which shows the sectional structure cut at the position of each cutting line of FIG. 3 ((a) is the sectional view cut at the position of II-II cutting line, (b) is the sectional view cut at the position of III-III cutting line. , (C) is a sectional view cut at the position of the IV-IV cutting line, (d) is a sectional view cut at the position of the VV cutting line, and (e) is a sectional view cut at the position of the VI-VI cutting line. Figure). FIG. 3 is a cross-sectional view of a main part showing a cross-sectional structure at different positions with respect to FIG. It is a figure which shows the stress state which acts on the connecting part of the pile connecting column structure which concerns on Embodiment 1 of this invention ((a) is the sectional view along the longitudinal direction, (b) is the sectional view which is orthogonal to the longitudinal direction). .. It is a figure which shows the distribution of the bending moment acting on the pile connecting column structure which concerns on Embodiment 1 of this invention. It is a figure which shows the relationship between pm + ps [N / mm ² ] and the insertion length L. It is a figure for demonstrating the construction method of the pile connecting column structure which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the construction method of the pile connecting column structure which concerns on Embodiment 1 of this invention. It is sectional drawing for demonstrating the construction method of the pile connecting column structure which concerns on Embodiment 1 of this invention. The figure which shows the schematic structure of the pile connecting column structure which concerns on Embodiment 2 of this invention ((a) is the sectional view of the main part along the longitudinal direction, (b) is cut at the position of line VII-VII of (a) Sectional view). It is sectional drawing of the main part which shows the schematic structure of the pile connecting column structure which concerns on Embodiment 3 of this invention. It is sectional drawing for demonstrating the construction method of the pile connecting column structure which concerns on Embodiment 3 of this invention. It is sectional drawing for demonstrating the construction method of the pile connecting column structure which concerns on Embodiment 3 of this invention. It is sectional drawing of the main part which shows the schematic structure of the column connecting column structure which concerns on Embodiment 4 of this invention. It is sectional drawing for demonstrating the construction method of the pile connecting column structure which concerns on Embodiment 4 of this invention. It is sectional drawing for demonstrating the construction method of the pile connecting column structure which concerns on Embodiment 4 of this invention. It is sectional drawing for demonstrating the construction method of the pile connecting column structure which concerns on Embodiment 4 of this invention. It is sectional drawing of the main part which shows the schematic structure of the pile connecting column structure which concerns on Embodiment 5 of this invention. It is sectional drawing for demonstrating the construction method of the pile connecting column structure which concerns on Embodiment 5 of this invention. The figure which shows the modification 1 of the Embodiment of this invention ((a) is the sectional view of the main part along the longitudinal direction, (b) is the sectional view cut at the position of the VIII-VIII cutting line of (a)). The figure which shows the modification 2 of the Embodiment of this invention ((a) is the sectional view of the main part along the longitudinal direction, (b) is the sectional view cut at the position of the IX-IX cutting line of (a)). It is sectional drawing which shows the modification 3 of the Embodiment of this invention. It is sectional drawing which shows the modification 4 of the Embodiment of this invention. The figure which shows the modification 5 of the pile connecting column structure which concerns on embodiment of this invention ((a) is the sectional view of the main part along the longitudinal direction, (b) is cut at the position of the XI-XI cutting line of (a) Cross-sectional view).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In all the drawings for explaining the embodiment of the present invention, those having the same function are designated by the same reference numerals, and the repeated description thereof will be omitted.
In addition, each drawing is schematic and may differ from the actual one.
In addition, the following embodiments exemplify devices and methods for embodying the technical idea of the present invention, and do not specify the configuration to the following. That is, the technical idea of the present invention can be modified in various ways within the technical scope described in the claims.
Further, in the following embodiment, in the three directions orthogonal to each other in the space, the first direction and the second direction orthogonal to each other in the same plane are set to the X direction and the Y direction, respectively, and the first direction and the second direction are defined. The third direction orthogonal to each of the second directions is defined as the Z direction.

[Embodiment 1]
In the first embodiment, a case where the present invention is applied to a pile connecting column structure for constructing a ball-proof net structure as a building structure will be described.

≪Ball-proof net structure≫
First, before explaining the pile connecting column structure and its construction method, the ball-proof net structure will be described.

As the ball-proof net structure, for example, in a golf driving range or a golf course, a plurality of pile connecting strut structures 1 shown in FIG. 1 are installed around the site or inside or outside the course, and the plurality of pile connecting strut structures 1 are installed. A ball-proof net 61 is stretched over each of the golf courses to prevent the golf ball from scattering outside the playing field. In this type of pile connecting strut structure 1, since the height of the steel pipe strut 20 as a strut erected on the ground reaches several tens of meters, a plurality of split columns having a length that can be transported, for example, 5 m to 10 m, are provided. The pillars are being constructed by connecting them one by one at the site. In the first embodiment, for example, three split columns 62a to 62c are connected in this order to construct a steel pipe column 20.

≪Pile connection strut structure≫
Next, the pile connecting column structure 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

As shown in FIGS. 1, 2 and 3, the pile connecting column structure 1 of the first embodiment has a steel pipe pile 10 as a pile installed in the ground 2 (underground) and the steel pipe pile 10 of the steel pipe pile 10. A steel pipe strut 20 as a strut to which one end side is connected via a connecting portion 30 is provided on one end side.

The steel pipe pile 10 is embedded in the ground 2 so that the end portion 10x on one end side in the longitudinal direction (Z direction) protrudes upward from the ground 2 and follows the vertical direction Vd. The steel pipe column 20 is placed on the steel pipe pile 10 so that the end portion 20x on one end side in the longitudinal direction (Z direction) faces the end portion 10x on the one end side of the steel pipe pile 10 and the longitudinal direction is along the vertical direction Vd. It is erected.

In the ground 2, a recess 4 is formed by excavation so as to surround the steel pipe pile 10 installed in the ground 2. Then, at the bottom of the recess 4, a leveled concrete layer 5 is formed by casting so as to surround the steel pipe pile 10. Then, on the leveled concrete layer 5, a root-wrapping concrete layer 6 is formed by casting so as to surround the steel pipe pile 10.

Normally, the recess 4 is backfilled with earth and sand at the time of excavation, but in the first embodiment, the backfilling of the recess 4 is omitted.

≪Steel pipe pile≫
As shown in FIGS. 2, 3 and 4 (d) and 4 (e), the steel pipe pile 10 penetrates along the longitudinal direction and has an outer peripheral surface 10a and an inner peripheral surface 10b in a cross section orthogonal to the longitudinal direction. Is mainly composed of circular steel pipes.

For example, earth and sand 3 is packed as a filling material inside the steel pipe pile 10 (through hole). The earth and sand 3 is one step lower than the end portion 10x on the one end side of the steel pipe pile 10 from the other end side opposite to the one end side in the longitudinal direction of the steel pipe pile 10, for example, to a position similar to the surface layer portion 2a of the ground 2. It is packed. The inside of the one end side of the steel pipe pile 10 is filled with the filler 37 described later from the end portion 10x on the one end side of the steel pipe pile 10 to the earth and sand 3.

≪Steel pipe support≫
As shown in FIGS. 2, 3 and 4 (a) and 4 (b), the steel pipe support column 20 has a circular outer peripheral surface 20a and an inner peripheral surface 20b in a cross section that penetrates in the longitudinal direction and is orthogonal to the longitudinal direction. It is mainly composed of shaped steel pipes. The steel pipe column 20 is provided with a lid 22 provided at an end portion 20x on one end side in the longitudinal direction so as to close the inside. The lid 22 suppresses the filling material 37 described later from entering the inside of the steel pipe column 20.

≪Connecting part≫
As shown in FIGS. 2, 3 and 4 (a) to 4 (e), in the connecting portion 30, one end side of the steel pipe pile 10 is inserted into the inside from one end portion 31x in the longitudinal direction (Z direction), and the connecting portion 30 is inserted in the longitudinal direction. A connecting pipe 31 in which one end side of the steel pipe column 20 is inserted into the inside from the other end portion 31y on the opposite side of the one end portion 31x is provided. Further, the connecting portion 30 extends inside the connecting pipe 31 between the steel pipe pile 10 and the connecting pipe 31, between the steel pipe column 20 and the connecting pipe 31, and between the steel pipe pile 10 and the steel pipe column 20. It includes a filled filler 37.

The connecting pipe 31 is mainly composed of a steel pipe having a circular outer peripheral surface 31a and an inner peripheral surface 31b in a cross section that penetrates in the longitudinal direction (X direction) and is orthogonal to the longitudinal direction. The connecting pipe 31 is installed on the leveled concrete layer 5 so that one end 31x is in contact with the upper surface of the leveled concrete layer 5, and the connecting pipe 31 is positioned in the longitudinal direction by the leveled concrete layer 5. That is, the leveled concrete layer 5 serves as an installation reference surface when the connecting pipe 31 is installed by inserting one end side of the steel pipe pile 10 into the inside of the connecting pipe 31 from the one end portion 31x of the connecting pipe 31.

In the connecting portion 30, the outer peripheral surface of the steel pipe pile 10 is between the inner peripheral surface 31b of the connecting pipe 31 and the outer peripheral surface 10a of the steel pipe pile 10 inserted into the connecting pipe 31 from one end portion 31x of the connecting pipe 31. A filling portion (gap portion) g ₁ is provided so as to surround the surface 10a. Further, between the inner peripheral surface 31b of the connecting pipe 31 and the outer peripheral surface 20a of the steel pipe strut 20 inserted into the connecting pipe 31 from the other end 31y of the connecting pipe 31, the outer peripheral surface 20a of the steel pipe strut 20 The filling portion g ₂ is provided so as to surround the filling portion g 2. Further, a filling portion g ₃ communicating with each of the filling portions g ₁ and g ₂ is provided between the end portion 10x on the one end side of the steel pipe pile 10 and the end portion 20x on the one end side of the steel pipe column 20. There is. Then, as shown in FIG. 5, the above-mentioned filler 37 is integrally filled in each of the filling portions g ₁ , g ₂ and g ₃ .

As the filler 37, it is preferable to use a filler having fluidity and curability. For example, non-shrink mortar, concrete, organic materials, cement-based inorganic materials and the like can be used. In the first embodiment, for example, concrete is used as the filler 37.

In addition, each of the filling portions g ₁ , g _{2, and} g ₃ is a region between two parts (between the steel pipe pile 10 and the connecting pipe 31, between the steel pipe column 20 and the connecting pipe 31, and the steel pipe pile 10). It means (between the steel pipe column 20) and is a space area before the filler 37 is filled, but is a filling region after the filler 37 is filled.

Further, in the first embodiment, since the lid 22 is installed at the end portion 20x on the one end side of the steel pipe column 20, the width of the filling portion g ₃ of this embodiment is the end portion on the one end side of the steel pipe pile 10. It is defined by 10x and a lid 22 installed at an end portion 20x on one end side of the steel pipe column 20.

≪Built-in spacer and support spacer≫
As shown in FIGS. 3 and 4 (d) and 4 (e), the connecting pipe 31 is a steel pipe pile 10 when the one end side of the steel pipe pile 10 is inserted into the inside of the connecting pipe 31 from one end 31x of the connecting pipe 31. The _first built-in spacer 33a for piles (see FIG. 4 (e)) and the second built-in spacer 33b for piles that hold the filling portion g1 between the outer peripheral surface 10a and the inner peripheral surface 31b of the connecting pipe 31. (See FIG. 4 (d)). The first built-in spacer 33a for piles is provided on the inner peripheral surface 31b of the connecting pipe 31 so as to project inward from the inner peripheral surface 31b in the vicinity of one end 31x side of the connecting pipe 31. The second built-in spacer 33b for piles is provided on the inner peripheral surface 31b of the connecting pipe 31 so as to project inward from the inner peripheral surface 31b in the vicinity of the central portion in the longitudinal direction of the connecting pipe 31.

Further, as shown in FIGS. 3 and 4A, the connecting pipe 31 is a steel pipe when the one end side of the steel pipe column 20 in the longitudinal direction is inserted into the inside of the connecting pipe 31 from the other end 31y of the connecting pipe 31. A first built-in spacer 34 for the support column for holding the filling portion g ₂ is further provided between the outer peripheral surface 20a of the support column 20 and the inner peripheral surface 31b of the connecting pipe 31. The first built-in spacer 34 for struts is provided on the inner peripheral surface 31b of the connecting pipe 31 so as to project inward from the inner peripheral surface 31b in the vicinity of the other end 31y side of the connecting pipe 31.

Further, as shown in FIGS. 3 and 4 (c), when the connecting pipe 31 is inserted from the other end 31y side of the connecting pipe 31 into the inside of the connecting pipe 31 in the longitudinal direction, one end side of the steel pipe column 20 is inserted. A support spacer 35 that supports the end portion 20x on the one end side of the steel pipe column ₂₀ and holds the filling portion g3 between the end portion 10x on the one end side of the steel pipe pile 10 and the end portion 20x on the one end side of the steel pipe column 20. Further prepared. The support spacer 35 is provided on the inner peripheral surface 31b of the connecting pipe 31 so as to project inward from the inner peripheral surface 31b in the vicinity of the central portion in the longitudinal direction of the connecting pipe 31.

As shown in FIGS. 4 (a), 4 (c) to 4 (e), each of the first built-in spacer 34 for columns, the support spacer 35, and the first and second built-in spacers 33a and 33b for piles is a connecting pipe. A plurality of them are arranged at predetermined intervals in the circumferential direction Cd of 31. In the first embodiment, the first built-in spacer 34 for the support, the support spacer 35, and the first and second built-in spacers 33a and 33b for the pile are each four at equal intervals in the circumferential direction Cd of the connecting pipe 31. Although it is arranged, the present invention is not limited to this, and at least three or more may be arranged.

Each of the first built-in spacer 34 for columns, the support spacer 35, and the first and second built-in spacers 33a and 33b for piles is formed of, for example, the same material as the connecting pipe 31, and the inner circumference of the connecting pipe 31 is welded. It is integrally joined to the surface 31b.

As shown in FIGS. 3 and 4B, the steel pipe column 20 has an outer peripheral surface of the steel pipe column 20 when the one end side of the steel pipe column 20 is inserted into the inside of the connecting pipe 31 from the other end 31y of the connecting pipe 31. A second built-in spacer 23 for a support column for holding the filling portion g ₂ is further provided between the 20a and the inner peripheral surface 31b of the connecting pipe 31. The second built-in spacer 23 for the strut is provided on the outer peripheral surface 20a of the steel pipe strut 20 so as to project outward from the outer peripheral surface 20a in the vicinity of the end portion on one end side in the longitudinal direction of the steel pipe strut 20. .. Also in the second built-in spacer 23 for the support, the steel pipe support column 20 is similar to each of the first built-in spacer 34 for the support, the support spacer 35, and the first and second built-in spacers 33a and 33b for the pile. Although four are arranged at equal intervals in the circumferential direction, the present invention is not limited to this, and at least three or more may be arranged.

The second built-in spacer 23 for the column is formed of, for example, the same material as the steel pipe column 20, and is integrally joined to the outer peripheral surface 20a of the steel pipe column 20 by welding.

As shown in FIGS. 4A and 4B, when the steel pipe support 20 is inserted from the other end 31y of the connecting pipe 31 into the inside of the connecting pipe 31, one end side of the steel pipe support 20 is inserted into the steel pipe support 20. The second built-in spacer 23 for the support is connected to the first built-in spacer 34 for the support so that the second built-in spacer 23 for the support does not come into contact with the first built-in spacer 34 for the support of the connecting pipe 31. It is inserted in a state where the position is shifted in the circumferential direction Cd of 31.
Further, in the first embodiment, the steel pipe pile 10 and the steel pipe column 20 are formed with the same inner diameter and outer diameter.
Further, the connecting pipe 31 has an inner diameter larger than the outer diameter of each of the steel pipe pile 10 and the steel pipe column 20 so that the filling portions g1 and g2 _are formed between the steel pipe pile ₁₀ and the steel pipe column 20. And is formed with an outer diameter.
In addition, the connecting pipe 31 will be described with reference to FIG. The pile insertion length L1 in which the steel pipe pile 10 is inserted into the connecting pipe 31 and the steel pipe column 20 are inserted into the connecting pipe 31 so that the filling portion g ₃ is formed between the end portion 20x on one end side. It is formed with a length longer than the value obtained by adding the column insertion length L2.

≪Strength of connecting part≫
Next, the strength of the connecting portion 30 will be described with reference to FIGS. 6A and 6B.
In FIG. 6, Dc is the outer diameter of the steel pipe column 20, ct is the plate thickness of the steel pipe column 20, Dp is the outer diameter of the steel pipe pile 10, tp is the plate thickness of the steel pipe pile 10, Dj is the outer diameter of the connecting pipe 31, tj. Is the plate thickness of the connecting pipe 31.
Further, L1 is a pile insertion length in which one end side of the steel pipe pile 10 is inserted into the inside of the connecting pipe 31 from one end 31x of the connecting pipe 31, and L2 is a steel pipe inside the connecting pipe 31 from the other end 31y of the connecting pipe 31. The length of the support for inserting one end of the support, LT is the length from one end 31x to the other end 31y of the connecting pipe 31, and 2/3 · L is the arm length of the resultant force of the reaction force of the filler 37, Ls. Is the length between the steel pipe pile 10 and the steel pipe column 20.
Further, N is a vertical force, S is a shearing force, M1 is a bending moment acting on the steel pipe column 20, and M2 is a bending moment transmitted to the steel pipe pile 10. Further, Rf1 is a reaction force acting on the steel pipe column 20 from the connecting pipe 31 via the filler 37, and Rf2 is a reaction force acting on the steel pipe pile 10 from the connecting pipe 31 via the filler 37. Further, σn is the axial compressive stress degree of the filler 37 with respect to the vertical force N, pm is the maximum compressive stress degree of the filler 37 due to the bending moment, and ps is the compressive stress degree of the filler 37 due to the shear force.
Further, S1 is the shear stress of the filler 37, cs is the compressive stress of the filler 37, and W is the working width in which the compressive stress acts on the filler 37 in the cross section orthogonal to the longitudinal direction of the connecting pipe 31.
In addition, in order to make the drawing easier to see, the hatching of the filler 37 is omitted in FIG. 6 (b).

In the pile connecting column structure 1, referring to FIG. 7, for example, when a wind blows, a bending moment due to wind pressure acts on the connecting portion 30, so that the connecting portion 30 has a strength that can withstand the bending moment. is necessary.

Therefore, to explain with reference to FIGS. 6A and 6B, when the bending moments M1 and M2 acting on the connecting pipe 31 from the steel pipe column 20 and the steel pipe pile 10 are set to M, the filler of the connecting portion 30 is used. It is assumed that the compressive stress generated in 37 is a triangular distribution. Then, each of the pile insertion length L1 and the column insertion length L2 is set to L, the maximum value of the compressive stress generated in the filler 37 (maximum compressive stress) is set to pm, and the cross section orthogonal to the longitudinal direction of the connecting pipe 31 is formed. Assuming that the working width on which the compressive stress acts on the filler 37 is W,
The resultant force F of the compressive stress acting on the filler 37 is
F = 1/2 ・ (pm ・ W ・ L / 2) = 1/4 ・ pm ・ W ・ L
It can be found by.
Since the arm length (distance between the left and right resultant forces) of the resultant force of the reaction forces in the filler 37 is 2/3 · L.
Couple Fp is
Fp = F ・ 2/3 = 1/6 ・ pm ・ W ・ L ²
It can be found by.
Since this couple Fp balances with the bending moment M of the steel pipe column 20, the maximum compressive stress pm of the filler 37 can be obtained from the following equation (1).
M = 1/6 ・ pm ・ W ・ L ²
pm = 6 ・ M / (W ・ L ² )
= 6 ・ M / (Dp / √2 ・ L ² )
= 6√2 ・ M / (Dp ・ L ² ) …… (1)

On the other hand, assuming that the shearing force acting on the connecting pipe 31 is S, the compressive stress ps generated in the filler 37 can be obtained from the following equation (2).
ps = S / (W ・ L) = S / (Dp / √2 ・ L)
= √2 ・ S / (Dp ・ L) …… (2)

The value of pm (maximum compressive stress of the filler 37 due to the bending moment M) expressed by the above equation (1) is ps (the compression generated in the filler 37 with respect to the shear force S) expressed by the above equation (2). If the value (Pm + Ps) obtained by adding the value of stress) is within the allowable compressive stress degree of the filler 37, the bending moment M can be transmitted to the connecting pipe 31 via the filler 37.

Further, if the allowable bending moment of the connecting pipe 31 and the allowable bending moment of the steel pipe pile 10 are equal to or greater than the bending moment of the steel pipe column 20, the connecting pipe 31 and the steel pipe pile 10 are safe, and the steel pipe column 20 is passed through the connecting pipe 31. The structure of transmitting the bending moment of the above to the steel pipe pile 10, that is, the structure of the connecting portion 30 of the first embodiment is established.

With respect to the vertical force N, the filling portion g ₃ (see FIG. 5) between the end portion 20x on the one end side of the steel pipe column 20 and the end portion 10x on the one end side of the steel pipe pile 10 in the connecting pipe 31 (see FIG. 5). It suffices if the strength of the filler 37 filled in is safe with respect to the degree of compressive stress generated by the vertical force N.

Further, with respect to the shear force S, the shear strength of the connecting pipe 31 may be larger than the shear force S.

≪Specifications of joints≫
Next, one specification of the connecting portion 30 examined by the present inventors will be described with reference to FIG. 7, but the present invention is not limited to this one specification. In FIG. 7, Ns is the design vertical force, Ss is the design shear force, and Ms is the design bending moment at the connecting portion 30.

<Conditions for steel pipe piles>
As a condition of the steel pipe pile 10,
Outer diameter: Dp = 800mm
Plate thickness: tp = 14 mm
Material: SKK490A
And said.

<Conditions for steel pipe columns>
As a condition of the steel pipe support 20,
Height from the surface layer 2a (ground surface) of the ground 2 to the apex: 30 m
Outer diameter: Dc = 800 mm
Plate thickness: tp = 14 mm
Material: SM490A
And said.

<Conditions for connecting parts>
As a condition of the connecting pipe 31,
Insertion length (insertion length) of steel pipe piles and steel pipe columns into connecting pipes: L
Outer diameter: Dj = 1000mm
Plate thickness (thickness): tj = 14 mm
Cross-sectional area: As = 43960 mm ²
Moment of area: Z = 105 × 10 ^-4 m ³
Material: SKK490
Allowable tensile stress: σs = 325N / mm ²
Allowable shear stress: τs = 187N / mm ²
And said.

<Concrete conditions>
As a condition of the concrete (filled concrete) used as the filler 37,
Compression standard strength: 18N / mm ²
Allowable compressive stress: σc = 12N / mm ²
Allowable shear stress: τc = 1.2N / mm ²
Cross-sectional area: A2 = 3.14 / 4 ・ ((Dj-2 ・ tj) ² -Dc ² )
= 3.14 / 4 ・ (972 ^{2-800 2 )}
= 3.14 / 4 (944784-640000)
= 239255mm ²
And said.

<Load conditions>
As a condition of each load acting on the connecting portion 30,
Design vertical force: Ns = 60kN
Design shear force: Ss = 107kN
Design bending moment: Ms = 1581kN ・ m
And said.

<Examination 1; Examination of compressive strength of filled concrete against bending moment and shear force>
First, the relationship between the design bending moment Ms and the degree of compressive stress of the filled concrete is expressed by the above equation (1).
pm = 6√2 ・ M / (Dp ・ L ² )
In this study, Ms = 1581 kN ・ m and Dp = 800 [mm].
pm = 6√2 ・ Ms / (Dp ・ L ² )
= 6√2 ・ 1581000000 / (800 ・ L ² )
= 1676605 / L ²
Will be.

On the other hand, the compressive stress degree ps of the filler 37 due to the design shear force is obtained from the above equation (2).
ps = √2 ・ Ss / (Dp ・ L)
= 1.414 / 107000 / (800 / L)
= 189 / L
Will be.
Therefore, the maximum compressive stress degree pm + ps of the filled concrete is given by the following equation.
pm + ps = 1676605 / L ² + 189 / L

Here, FIG. 8 shows the relationship between pm + ps [N / mm ² ] and the insertion length L of the steel pipe pile 10 or the steel pipe column 20 inside the connecting pipe 31.
From FIG. 8, the allowable compressive stress degree σc of the filled concrete is
Since σc = 12N / mm ² ,
The required insertion length L of the steel pipe pile 10 or the steel pipe column 20 is
L = 1190 [mm] = 1.49 · Dp.
If the insertion length L is longer than this, the compressive strength of the filled concrete is safe.

Here, L = 1.5 × Dp = 1200 mm.
At this time,
pm = 1676605/1200 ² = 11.64N / mm ²
ps = 189/1200 = 0.16N / mm ²
pm + ps = 11.64 + 0.16
= 11.8N / mm ² ≤12N / mm ²
It is good.

<Examination 2; Examination of compressive strength of filled concrete against vertical force>
When the design vertical force Ns is Ns = 60kN,
The area A1 at the end 20x of the steel pipe column 20 and the end 10x of the steel pipe pile 10 is
A1 = 3.14 x 800 x 800/4 = 502400 [mm ² ]
Because it is
The axial compressive stress degree σn of filled concrete is
σn = Ns / A1 = 0.12N / mm ² ≦ σc = 12N / mm ²
It is good.

<Examination 3; Examination of shear strength of connecting pipe>
The design shear force Ss is Ss = 107 [kN].
The resultant force F of the compressive force of the filled concrete with respect to the bending moment is
F = 1/4 ・ pm ・ Dp / √2 ・ 1200
= 1/4 ・ 11.64 ・ 800 / 1.414 ・ 1200 = 1975672N
Will be.
Then, the shearing force S1 acting on the connecting pipe 31 is
S1 = Ss + F = 2082672N
Will be.

And since the cross-sectional area As of the connecting pipe is As = 43960 mm ² ,
The shear stress degree τ of the connecting pipe is
τ = S1 / (As / 2) = 2082672 / (43960/2)
= 95 [N / mm ² ] ≤ τs = 187 [N / mm ² ]
It is good.

<Examination 4; Examination of bending strength of connecting pipe>
When the design bending moment Ms is Ms = 1581 [kN ・ m]
Since the moment of inertia of area Z is Z = 105 × 10 ^-4 m ³ ,
The bending stress σ is
σ = Ms / Z = 1581 / 0.0105 = 150571kN / m ²
= 151N / mm ² ≤σs = 325N / mm ²
It is good.

<Examination results>
From the examination results of the above examinations 1 to 4, the specifications of the connecting portion 30 are determined as follows.
(Connecting pipe)
Steel pipe material: SM490A
Outer diameter: 1000 [mm]
Plate thickness: 14 [mm]
Length: 1200 x 2 + 400 = 2800 mm
(Filled concrete)
Compression standard strength: 18N / mm ²
Maximum aggregate size: 20 mm
Slump: 18 cm
(Steel pipe pile 10 and steel pipe support 20)
Insertion length: 1200 mm
That is, to explain with reference to FIGS. 5 and 7, the pile insertion length L1 for inserting one end side of the steel pipe pile 10 into the inside of the connecting pipe 31 from the one end portion 31x of the connecting pipe 31 is the outer diameter of the steel pipe pile 10. It is preferably 1.5 times or more of Dp. Further, the strut insertion length L2 for inserting one end side of the steel pipe strut 20 into the inside of the connecting pipe 31 from the other end 31y of the connecting pipe 31 may be 1.5 times or more the outer diameter Dc of the steel pipe strut 20. preferable.

Even when mortar is used as the filler 37, the specifications are the same.

≪Construction method of pile connecting strut structure≫
Next, the construction method of the pile connecting column structure 1 of the first embodiment will be described with reference to FIGS. 9 to 11.

First, as shown in FIG. 9A, the steel pipe pile 10 is installed in the ground 2 so that the end portion 10x on one end side protrudes from the ground 2 and is along the vertical direction Vd. The installation of the steel pipe pile 10 is performed, for example, by forming an excavation hole 2b in the ground 2 along the vertical direction Vd by an excavator, inserting the steel pipe pile 10 into the excavation hole 2b, and then excavating the earth and sand generated during excavation. This is done by backfilling the gap between 2b and the steel pipe pile 10. Concrete or mortar may be filled between the excavation hole 2b and the steel pipe pile 10.

Next, as shown in FIG. 9B, the earth and sand 3 generated during excavation of, for example, the excavation hole 2b is packed as a filling material inside the steel pipe pile 10 installed in the ground 2. It is preferable that the earth and sand 3 is packed to a position one step lower than the end portion 10x on one end side of the steel pipe pile 10, for example, to a position comparable to the surface layer portion 2a of the ground 2. Further, the stuffing step of the earth and sand 3 is preferably carried out before the filling step of the filler 37 described later, but more preferably carried out before the installation of the connecting pipe 31 described later from the viewpoint of workability. The earth and sand 3 functions as a suppressing portion for suppressing the infiltration of the filler 37 into the inside of the steel pipe pile 10 in the filling step of the filler 37 described later.

Next, the ground 2 around the steel pipe pile 10 installed in the ground 2 is excavated to form a recess 4 in the ground 2 surrounding the steel pipe pile 10, and then, as shown in FIG. 10A, the recess is formed. A leveling concrete layer 5 is formed by casting on the bottom of 4.

Next, one end side of the steel pipe pile 10 installed in the ground 2 is inserted into the inside of the connecting pipe 31 from the one end portion 31x in the longitudinal direction of the connecting pipe 31, and as shown in FIG. 10 (b), the ground 2 The connecting pipe 31 is installed on the leveling concrete layer 5 provided at the bottom of the recess 4. The connecting pipe 31 is arranged in a state where one end portion 31x in the longitudinal direction is in contact with the upper surface of the leveled concrete layer 5.
In this step, the first built-in spacer 33a for piles and the second built-in spacer 33b provided inside the connecting pipe 31 are provided between the outer peripheral surface 10a of the steel pipe pile 10 and the inner peripheral surface 31b of the connecting pipe 31. _The filling portion g1 can be held over the circumferential direction Cd of the connecting pipe 31, and the relative X-direction and Y-direction positioning of the steel pipe pile 10 and the connecting pipe 31 can be performed.
Further, in this step, the relative height direction (Z direction) of the steel pipe pile 10 and the connecting pipe 31 can be positioned by the installation reference plane formed by the leveled concrete layer 5.
Further, in this step, since the first built-in spacer 33a for piles and the second built-in spacer 33b for piles are separated in the longitudinal direction of the connecting pipe 31, the first built-in spacer 33a for piles and the second built-in spacer 33b for piles are separated from each other. The second built-in spacer 33b makes it possible to easily align the longitudinal central axis of the connecting pipe 31 with the longitudinal central axis of the steel pipe pile 10.

Next, one end side of the steel pipe column 20 is inserted from the other end 31y of the connecting pipe 31 installed on the leveled concrete layer 5 into the inside of the connecting pipe 31 until it comes into contact with the support spacer 35, and FIG. 11 (a). ), The steel pipe column 20 is installed on the steel pipe pile 10. The steel pipe column 20 is installed along the vertical direction Vd. A lid 22 is previously installed on one end side of the steel pipe column 20 so as to close the inside of the steel pipe column 20.
In this step, the steel pipe support is provided by the first built-in spacer 34 for the support provided on the inner peripheral surface 31b of the connecting pipe 31 and the second built-in spacer 23 for the support provided on the outer peripheral surface 20a of the steel pipe support 20. _The filling portion g2 can be held between the outer peripheral surface 20a of 20 and the inner peripheral surface 31b of the connecting pipe 31 over the circumferential direction Cd of the connecting pipe 31 (FIGS. 4A and 4B). (See), the relative X-direction and Y-direction (horizontal direction) positioning of the steel pipe column 20 and the connecting pipe 31 can be performed.
Further, in this step, the support spacer 35 provided on the inner peripheral surface 31b of the connecting pipe 31 enables the connecting pipe 31 to stably support the steel pipe column 20 and the end portion of the steel pipe pile 10 on one end side. A filling portion g ₃ communicating with the filling portions g ₁ and g ₂ can be held between the 10x and the end portion 20x on one end side of the steel pipe column 20.

Next, as shown in FIG. 11B, the filling portion g1 between the outer peripheral surface 10a of the steel pipe pile ₁₀ and the inner peripheral surface 31b of the connecting pipe 31, the outer peripheral surface 20a of the steel pipe column 20 and the connecting pipe 31 Before hardening over each of the filling portion g ₂ between the inner peripheral surface 31b and the filling portion g ₃ between the end portion 10x on one end side of the steel pipe pile 10 and the end portion 20x on the one end side of the steel pipe column 20. Filling material 37 of. The filler 37 is injected into the filler g1 from the _other end 31y side of the connecting pipe 31. Then, the filler 37 injected into the filling portion g ₁ flows over the filling portion g ₂ and the filling portion g ₃ due to its own weight, and each of the filling portions g ₁ , g ₂ , and g ₃ is filled with the filler 37. Will be done. For example, concrete is used as the filler 37.
In this step, since the earth and sand 3 is previously packed in the inside of the steel pipe pile 10 as a filling material, the earth and sand 3 can prevent the filling material 37 from infiltrating into the inside of the steel pipe pile 10. In the first embodiment, since the earth and sand 3 is packed to a position one step lower than the end portion 10x on the one end side of the steel pipe pile 10, the filler 37 is inside the steel pipe pile 10 at the end on one end side of the steel pipe pile 10. It is filled from the portion 10x to the earth and sand 3, but further internal infiltration is suppressed.
Further, in this step, since a lid 22 for closing the inside of the steel pipe support 20 is previously installed on one end side of the steel pipe support 20, the filler 37 penetrates into the inside of the steel pipe support 20 by the lid 22. Can be suppressed.
Further, in this step, since one end side of the steel pipe column 20 is supported by the support spacer 35 that holds the filling portion g ₃ , each of the filling portions g ₁ , g ₂ , and g ₃ is filled with the filler 37 at one time. can do.

Next, the filler 37 is cured. As a result, a connecting portion 30 for connecting the steel pipe stanchions 20 to the steel pipe piles 10 installed in the ground 2 in an upright state is formed, and the steel pipe stanchions 20 are connected to the steel pipe piles 10 via the connecting portions 30. The pile connecting column structure 1 is almost completed.

After that, by forming the root-wound concrete layer 6 on the leveled concrete layer 5 so as to surround the steel pipe pile 10, the state shown in FIG. 1 is obtained.

<< Effect of Embodiment 1 >>
Next, the main effect of the first embodiment will be described.
The pile connecting column structure 1 of the first embodiment connects one end side of the steel pipe column 20 to one end side of the steel pipe pile 10 installed in the ground 2 via a connecting portion 30. The connecting portion 30 has a structure in which one end side of each of the steel pipe pile 10 and the steel pipe column 20 is inserted into the inside of the connecting pipe 31 to connect the steel pipe pile 10 and the steel pipe column 20. Since the connecting portion 30 can connect the steel pipe pile 10 and the steel pipe column 20 without inserting the steel pipe column 20 inside the steel pipe pile 10, the steel pipe pile 10 can be connected to the steel pipe column 20 as in the connecting portion of Patent Document 1. It is not necessary to dare to use a steel pipe pile 10 having an outer diameter larger than the outer diameter of the steel pipe column 20 in order to connect the steel pipe column 20 to the steel pipe column 10, and the steel pipe pile 10 and the steel pipe column 20 having the same outer diameter can be connected. ..
Further, the connecting portion 30 serves as a filling portion for filling the filler 37, and is provided between the inner peripheral surface 10b of the steel pipe pile 10 and the outer peripheral surface 31a of the connecting pipe 31 with the filling portion g ₁ and the inner circumference of the steel pipe column 20. Filling portion g ₂ between the surface 20b and the outer peripheral surface 31a of the connecting pipe 31, and filling portion g ₃ between the end portion 10x on one end side of the steel pipe pile 10 and the end portion 20x on the one end side of the steel pipe column 20. It has a structure with each. _The connecting portion 30 can easily widen the widths of the filling portions _g1 and g2 by increasing the outer diameter of the connecting pipe 31, and also increases the length of the connecting pipe 31 in the longitudinal direction. Since the width of the filling portion g ₃ can be easily widened, the steel pipe pile 10 whose outer diameter is intentionally larger than the outer diameter of the steel pipe column 20 according to the width of the filling portion, as in the connecting portion of Patent Document 1. There is no need to use. In particular, the connecting portion 30 has the filling portions g ₁ , g ₂ , and g ₃ so that the filler 37 can be smoothly filled without making the outer diameter of the steel pipe pile 10 larger than the outer diameter of the steel pipe column 20. The width can be easily increased.
Further, in the connecting portion 30, it is not necessary to use the steel pipe pile 10 whose outer diameter is larger than the outer diameter of the steel pipe column 20 in order to connect the steel pipe pile 10 and the steel pipe column 20, so that the steel pipe pile 10 is used as the ground. There is no need to increase the diameter of the excavation hole for installation in 2.
Therefore, according to the pile connecting column structure 1 of the first embodiment, it is not necessary to select a steel pipe pile 10 having an outer diameter larger than the outer diameter of the steel pipe column 20 in order to connect the steel pipe column 20 to the steel pipe pile 10. Further, since it is not necessary to increase the diameter of the drilling hole for installing the steel pipe pile 10 in the ground 2, the conventional connection in which the steel pipe support is inserted inside the steel pipe pile 10 as in the connection portion of Patent Document 1. The material cost and construction cost of the steel pipe pile 10 can be reduced as compared with the part. As a result, the cost of the pile connecting strut structure 1 can be reduced, and the cost of the ball-proof net structure (building structure) provided with the pile connecting strut structure 1 can be reduced.

Further, since the connecting portion 30 of the first embodiment is filled with the filler 37 over each of the filling portion g ₁ , the filling portion g ₂ , and the filling portion g ₃ , the connecting portion without the filling portion g ₃ is not provided. By being able to evenly distribute and transmit the vertical load acting on the upper end of the steel pipe pile 10 and the lower end of the steel pipe column 20, the stress on the bending moment and vertical force of the pile connecting column structure 1 The strength can be increased.

Further, in the connecting portion 30 of the first embodiment, the pile insertion length L1 for inserting one end side of the steel pipe pile 10 into the inside of the connecting pipe 31 from the one end portion 31x of the connecting pipe 31 is set to the outer diameter Dp of the steel pipe pile 10. The strut insertion length L2 for inserting the one end side of the steel pipe strut 20 into the inside of the connecting pipe 31 from the other end 31y of the connecting pipe 31 is set to 1. By setting the number to 5 times or more, it is possible to construct the connecting portion 30 having high strength against the bending moment.

In the construction method of the pile connecting strut structure 1 of the first embodiment, one end side of each of the steel pipe pile 10 and the steel pipe strut 20 is inserted into the connecting pipe 31, and then the outer peripheral surface 10a of the steel pipe pile 10 and the connecting pipe are connected. Filling portion g ₁ between the inner peripheral surface 31b of 31, filling portion g ₂ between the outer peripheral surface 20a of the steel pipe column 20 and the inner peripheral surface 31b of the connecting pipe 31, and one end of the steel pipe pile 10. The filler 37 is filled over _each of the filling portions g3 between the portion 10x and the end portion 20x on one end side of the steel pipe support column 20, and then the filler 37 is cured. Therefore, it is not necessary to select a steel pipe pile 10 having an inner diameter and an outer diameter larger than the outer diameter of the steel pipe pillar 20 in order to connect the steel pipe pillar 20 to the steel pipe pile 10, and the steel pipe pile 10 is installed in the ground 2. Since it is not necessary to increase the diameter of the drilling hole for this purpose, the material cost and construction of the steel pipe pile 10 are compared with the conventional connecting portion in which the steel pipe column is inserted inside the steel pipe pile 10 as in the connecting portion of Patent Document 1. The cost can be reduced. As a result, the pile connecting column structure 1 can be constructed at low cost.

Further, in the construction method of the pile connecting column structure 1 of the first embodiment, one end side of the steel pipe column 20 is connected to one end side of the steel pipe pile 10 via the connecting pipe 31 installed on the leveled concrete layer 5. Therefore, even if the protrusion height at which one end side of the steel pipe pile 10 protrudes from the ground 2 is different due to the installation error (casting error) when the steel pipe pile 10 is installed in the ground 2, the leveled concrete is used. By leveling the height position from the layer 5 to the support spacer 35 of the connecting pipe 31 so as to be a predetermined height position and adjusting the position of the concrete layer 5 in the height direction, the steel pipe column 20 is raised to a predetermined height. Can be installed in.

In the first embodiment, the case where the lid 22 is installed so as to close the inside of the steel pipe column 20 on one end side of the steel pipe column 20 has been described, but the lid body 22 does not necessarily have to be installed. The reason is that the filler 37 that penetrates into the steel pipe column 20 does not greatly exceed the column insertion length L2 of the steel pipe column 20, and the amount of the filler 37 that penetrates is small.

On the other hand, in the case of the steel pipe pile 10, since the filler 37 in an amount substantially corresponding to the total length of the steel pipe pile 10 infiltrates into the inside of the steel pipe pile 10, the inside of the steel pipe pile 10 is as in the first embodiment. It is necessary to stuff the stuffing material such as earth and sand 3 into the pile, and to install the lid 38 at the end portion 10x on one end side of the steel pipe pile 10, which will be described later in the third embodiment.

≪Actual example≫
Next, the effect of the first embodiment will be described with reference to specific examples, but the present invention is not limited to this example.
Generally, in the connecting portion of Patent Document 1, the width of the filling portion is 150 [mm] so that the filling portion between the steel pipe pile and the steel pipe column inserted inside the steel pipe pile can be reliably filled with the filler. ] It is necessary to do more than that. Further, also in the connecting portion 30 of the _first embodiment, the filler 37 can be reliably filled in the filling portion g1 between the connecting pipe 31 and the steel pipe column 20 inserted inside the connecting pipe 31. , The width of the filling portion g ₁ needs to be 150 [mm] or more. Therefore, in the connecting portion of Patent Document 1, it is necessary to make the outer diameter of the steel pipe pile larger than the outer diameter of the steel pipe column by about 200 [mm], and also in the connecting portion 30 of the first embodiment, the connecting pipe 31 It is necessary to make the outer diameter about 200 [mm] larger than the outer diameter of the steel pipe pile 10.

On the other hand, the design standard for steel pipe piles has the following provisions when the outer diameter of the steel pipe pile is D and the plate thickness (wall thickness) is t.
(# 1) Safety of steel pipe pile against local buckling: D / t ≦ 100
(# 2) Minimum plate thickness of steel pipe pile: t ≧ 9 mm
According to these regulations, steel pipe piles that are thicker than the required plate thickness determined by the stress of the steel pipe pile may be used. Therefore, in the following cases, by connecting the steel pipe column and the steel pipe pile with the same outer diameter, the weight of the steel pipe pile can be reduced, the cost of the steel pipe pile can be reduced, and the construction cost of the steel pipe pile can be reduced. can.
(I) When the outer diameter of the steel pipe column is 700 mm or less and the outer diameter of the steel pipe pile is 900 mm or less in the connecting portion of Patent Document 1, the connecting portion of Patent Document 1 and the connecting portion 30 of the first embodiment In either case, the plate thickness of the steel pipe pile is 9 mm according to the above (# 2), and the weight of the steel pipe pile having a smaller outer diameter, that is, the weight of the steel pipe pile 10 of the first embodiment is smaller.
(Ii) When the outer diameter of the steel pipe column is 800 mm, the steel pipe pile in the case of the connecting portion of Patent Document 1 has an outer diameter of 1000 mm or more and a plate thickness of 12 mm according to the above (# 1). Generally, the plate thickness of the steel pipe that can be easily procured is 9 mm, 12 mm, 14 mm, 16 mm, and 19 mm.

On the other hand, the steel pipe pile 10 in the case of the connecting portion 30 of the first embodiment can have an outer diameter of 800 mm and a plate thickness of 9 mm according to the above (# 2), and the connecting portion of the first embodiment. 30 can reduce the weight of the steel pipe pile 10. When the outer diameter of the steel pipe pile becomes larger, the minimum value of the plate thickness is often determined by the above (# 1), and the connecting portion 30 of the first embodiment having a smaller outer diameter of the steel pipe pile is used. However, the plate thickness of the steel pipe pile 10 can be reduced as compared with the connecting portion of Patent Document 1, and the connecting portion 30 of the first embodiment can often reduce the weight of the steel pipe pile 10.

That is, when the plate thickness of the steel pipe pile is determined by D / t ≦ 100 or t ≧ 9 mm and is larger than the plate thickness required for stress, the connecting portion 30 of the first embodiment is effective.

Further, in a steel pipe pile having a two-stage structure, since the bending moment acting on the lower steel pipe pile is small, the plate thickness of the steel pipe pile at the lower end is often determined by D / t ≦ 100 or t ≧ 9 mm. The connecting portion 30 of is effective.

[Embodiment 2]
≪Pile connection strut structure≫
The pile connecting strut structure 1A of the second embodiment has substantially the same configuration as the pile connecting strut structure 1 of the above-described first embodiment, and the following configurations are different.

That is, as shown in FIG. 12, the pile connecting column structure 1A of the second embodiment includes a concrete pile 15 in place of the steel pipe pile 10 of the first embodiment. Other configurations are the same as those in the first embodiment.
The concrete pile 15 is mainly composed of a concrete pipe having a circular outer peripheral surface 15a and an inner peripheral surface 15b in a cross section that penetrates along the longitudinal direction and is orthogonal to the longitudinal direction. The concrete pile 15 has a prestressed concrete structure in which a compressive force is previously applied by, for example, a steel material or a reinforcing bar embedded in a concrete layer. Concrete piles with such a structure are commonly called PC piles. This PC pile has a large resistance to bending moment as compared with a normal concrete pile having no prestress.

The inside (through hole) of the concrete pile 15 is filled with earth and sand 3 as a filling material, as in the steel pipe pile 10 of the first embodiment described above. The earth and sand 3 is packed to a position one step lower than the end portion 15x on one end side of the concrete pile 15, for example, a position similar to the surface layer portion 2a of the ground 2. The inner portion of the concrete pile 15 on one end side is filled with the filler 37 from the end portion 15x on the one end side of the concrete pile 15 to the earth and sand 3.

Inside the connecting pipe 31 of the connecting portion 30, one end side of the concrete pile 15 is inserted from one end portion 31x of the connecting pipe 31, and one end side of the steel pipe column 20 is inserted from the other end portion 31y of the connecting pipe 31. Then, between the inner peripheral surface 31b of the connecting pipe 31 and the outer peripheral surface 15a of the concrete pile 15 inserted into the connecting pipe 31 from one end 31x of the connecting pipe 31, the outer peripheral surface 15a of the concrete pile 15 is provided. The filling portion g ₁ is provided so as to surround it. Further, between the inner peripheral surface 31b of the connecting pipe 31 and the outer peripheral surface 20a of the steel pipe strut 20 inserted into the connecting pipe 31 from the other end 31y of the connecting pipe 31, the outer peripheral surface 20a of the steel pipe strut 20 The filling portion g ₂ is provided so as to surround the filling portion g 2. Further, a filling portion g ₃ communicating with each of the filling portions g ₁ and g ₂ is provided between the end portion 15x on the one end side of the concrete pile 15 and the end portion 20x on the one end side of the steel pipe column 20. There is. Then, each of the filling portions g ₁ , g ₂ and g ₃ is integrally filled with the filler 37 as in the above-described first embodiment.

The concrete pile 15 is formed with the same outer diameter as the outer diameter of the steel pipe column 20. The connecting pipe 31 has an inner diameter and an outer diameter larger than the outer diameter of each of the concrete pile 15 and the steel pipe support 20 so that the filling portions g ₁ and g ₂ are formed between the concrete pile 15 and the steel pipe support 20. It is formed by diameter.

Here, the concrete pile 15 has a thicker plate thickness (thickness) than the steel pipe pile 10 of the first embodiment, and has a smaller inner diameter than the steel pipe pile having the same outer diameter. Therefore, in the connecting portion of Patent Document 1, it is necessary to select a concrete pile having a larger outer diameter according to the outer diameter of the column, so that it is difficult to use the concrete pile.

On the other hand, in the connecting portion 30 of the second embodiment, as in the first embodiment, the concrete pile 15 having an outer diameter larger than the outer diameter of the steel pipe column 20 for connecting the steel pipe column 20 to the concrete pile 15. Since it is not necessary to select the concrete pile 15, the concrete pile 15 having a thickness thicker than that of the steel pipe pile 10 can be used.

Therefore, according to the pile connecting column structure 1A of the second embodiment, the same effect as that of the first embodiment can be obtained, and the concrete pile 15 can be used.

[Embodiment 3]
≪Pile connection strut structure≫
The pile connecting strut structure 1B of the third embodiment has substantially the same configuration as the pile connecting strut structure 1 of the above-described first embodiment, and the following configurations are different.

That is, as shown in FIG. 13, in the pile connecting column structure 1B of the third embodiment, the lid 38 is installed so as to close the inside of the steel pipe pile 10 at the end portion 10x on one end side of the steel pipe pile 10. ing. Other configurations are the same as those of the pile connecting column structure 1 of the above-described first embodiment.
The lid 38 suppresses the filling material 37 from flowing into the steel pipe pile 10 when the filling material 37 is filled in each of the filling portions g ₁ , g ₂ , and g ₃ . Therefore, the width of the filling portion g ₃ of the third embodiment is the lid 38 provided at the end 10x on the one end side of the steel pipe pile 10 and the lid 20x provided at the end 20x on the one end side of the steel pipe column 20. It is defined by 22.

≪Construction method of pile connecting strut structure≫
Next, the construction method of the pile connecting column structure 1B of the third embodiment will be described with reference to FIGS. 14 and 15.

First, the same process as in the first embodiment is carried out to install the steel pipe pile 10 in the ground 2 and to form the recess 4 and the leveled concrete layer 5 as shown in FIG. 14 (a). In the first embodiment, the earth and sand 3 is packed as a filling material inside the steel pipe pile 10, but in the third embodiment, the earth and sand 3 is not packed.

Next, as shown in FIG. 14A, the lid 38 is installed at the end 10x on one end side of the steel pipe pile 10 installed in the ground 2 so as to close the inside of the steel pipe pile 10. The inside of the steel pipe pile 10 on one end side is sealed by the lid 38.

Next, similarly to the above-described first embodiment, one end side of the steel pipe pile 10 installed in the ground 2 is inserted into the inside of the connecting pipe 31 from the one end portion 31x in the longitudinal direction of the connecting pipe 31, and FIG. As shown in b), the connecting pipe 31 is installed on the leveled concrete layer 5 provided at the bottom of the recess 4 of the ground 2.
In this step, similarly to the above-described first embodiment, the outer peripheral surface 10a of the steel pipe pile 10 and the connecting pipe 31 are provided by the first built-in spacer 33a and the second built-in spacer 33b for piles provided inside the connecting pipe 31. _The filling portion g1 can be held over the circumferential direction Cd of the connecting pipe 31 between the inner peripheral surface 31b and the steel pipe pile 10 and the connecting pipe 31 in the relative X and Y directions. Positioning can be performed. Further, the installation reference plane of the leveled concrete layer 5 enables positioning of the steel pipe pile 10 and the connecting pipe 31 in the relative height direction (Z direction). Further, since the first built-in spacer 33a for piles and the second built-in spacer 33b for piles are separated from each other in the longitudinal direction of the connecting pipe 31, the first built-in spacer 33a for piles and the second built-in spacer 33b for piles are separated. The spacer 33b makes it possible to easily align the longitudinal central axis of the connecting pipe 31 with the longitudinal central axis of the steel pipe pile 10.

Next, as in the first embodiment described above, one end side of the steel pipe column 20 is reached from the other end 31y of the connecting pipe 31 installed on the leveled concrete layer 5 until it comes into contact with the support spacer 35 inside the connecting pipe 31. Is inserted, and the steel pipe column 20 is installed on the steel pipe pile 10 as shown in FIG. 15 (a). Similar to the first embodiment, the lid 22 is preliminarily installed on one end side of the steel pipe column 20 so as to close the inside of the steel pipe column 20.
In this step, similarly to the above-described first embodiment, the first built-in spacer 34 for the support provided on the inner peripheral surface 31b of the connecting pipe 31 and the second built-in spacer 34 for the support provided on the outer peripheral surface 20a of the steel pipe support 20. With the built _- in spacer 23, the filling portion g2 can be held between the outer peripheral surface 20a of the steel pipe column 20 and the inner peripheral surface 31b of the connecting pipe 31 over the circumferential direction Cd of the connecting pipe 31. The relative X-direction and Y-direction (horizontal direction) positioning of the steel pipe column 20 and the connecting pipe 31 can be performed. Further, the support spacer 35 provided on the inner peripheral surface 31b of the connecting pipe 31 enables the connecting pipe 31 to stably support the steel pipe column 20, and also the end portion 10x on one end side of the steel pipe pile 10 and the steel pipe column. It is possible to hold the filling portion g ₁ and the filling portion g ₃ communicating with the filling portion g ₂ between the end portion 20x on one end side of the 20.

Next, as shown in FIG. 15B, the filling portion g1 between the outer peripheral surface 10a of the steel pipe pile ₁₀ and the inner peripheral surface 31b of the connecting pipe 31, the outer peripheral surface 20a of the steel pipe column 20 and the connecting pipe 31 Filling before curing over the filling portion g ₂ between the inner peripheral surface 31b and the filling portion g ₃ between the end portion 10x on one end side of the steel pipe pile 10 and the end portion 20x on the one end side of the steel pipe column 20. Fill the material 37. The filler 37 is injected into the filler g1 from the _other end 31y side of the connecting pipe 31. Then, the filler 37 injected into the filling portion g ₁ flows over the filling portion g ₂ and the filling portion g ₃ due to its own weight, and each of the filling portions g ₁ , g ₂ , and g ₃ is filled with the filler 37. Will be done. For example, concrete is used as the filler 37.
In this step, since a lid 38 for closing the inside of the steel pipe pile 10 is provided in advance on one end side of the steel pipe pile 10, the filler 37 penetrates into the inside of the steel pipe pile 10 by the lid 38. Can be suppressed.
Further, in this step, as in the above-described first embodiment, a lid 22 for closing the inside of the steel pipe support 20 is provided in advance on one end side of the steel pipe support 20, so that the lid 22 provides a filler. It is possible to prevent 37 from invading the inside of the steel pipe column 20. Further, since one end side of the steel pipe column 20 is supported by the support spacer 35 that holds the filling portion g ₃ , each of the filling portions g ₁ , g ₂ , and g ₃ can be filled with the filler 37 at one time. can.

Next, the filler 37 is cured. As a result, a connecting portion 30 is formed in which the steel pipe column 20 is erected and connected to the steel pipe pile 10 installed in the ground 2, and the steel pipe column 20 is connected to the steel pipe pile 10 via the connecting portion 30. The pile connecting column structure 1B is almost completed.

After that, by forming the root-wound concrete layer 6 on the leveled concrete layer 5 so as to surround the steel pipe pile 10, the state shown in FIG. 13 is obtained.

In the third embodiment, the lid 38 is installed before the connecting pipe 31 is installed, but the lid 38 may be installed before the filler 37 is filled. Therefore, this embodiment is used. Not limited to 3. That is, the installation step of the lid 38 is preferably performed before the filling step of the filler 37, but more preferably performed before the installation step of the connecting pipe 31 from the viewpoint of workability.

<< Effect of Embodiment 3 >>
According to the pile connecting column structure 1B of the third embodiment and the construction method thereof, the same effect as that of the first embodiment can be obtained.
Further, according to the construction method of the pile connecting column structure 1B of the third embodiment, a lid 38 for closing the inside of the steel pipe pile 10 is installed on one end side of the steel pipe pile 10 before filling the filler 37. Therefore, it is possible to prevent the filler 37 from invading the inside of the steel pipe pile 10.
Therefore, the step and cost of charging the stuffed earth and sand inside the steel pipe pile in the case of the first embodiment can be omitted. Therefore, especially in the case of steel pipe piles with a deep installation depth in the ground, the process and construction costs can be reduced.
Also in the pile connecting column structure 1B of the third embodiment, the concrete pile 15 can be used instead of the steel pipe pile 10 as in the pile connecting column structure 1A of the above-mentioned second embodiment.

[Embodiment 4]
≪Pile connection strut structure≫
The pile connecting strut structure 1C of the fourth embodiment has substantially the same configuration as the pile connecting strut structure 1 of the above-described first embodiment, and the following configurations are different.

That is, as shown in FIG. 16, the pile connecting strut structure 1C of the fourth embodiment includes the lid 38 like the pile connecting strut structure 1B of the above-mentioned third embodiment, and further, the above-described first embodiment. A connecting portion 40 is provided in place of the connecting portion 30. Other configurations are the same as those in the first embodiment described above.

In the connecting portion 40, one end side of the steel pipe pile 10 is inserted inside from one end portion 41x in the longitudinal direction (Z direction), and the steel pipe column 20 is internally inserted from the other end portion 41y on the opposite side to the one end portion 41x in the longitudinal direction. It is provided with a connecting pipe 41 into which one end side is inserted. Further, the connecting portion 40 extends inside the connecting pipe 41 between the steel pipe pile 10 and the connecting pipe 41, between the steel pipe column 20 and the connecting pipe 41, and between the steel pipe pile 10 and the steel pipe column 20. It includes a filled filler 47.

The connecting pipe 41 is mainly composed of a steel pipe having a circular outer peripheral surface 41a and an inner peripheral surface 41b in a cross section that penetrates in the longitudinal direction (X direction) and is orthogonal to the longitudinal direction. The connecting pipe 41 is installed on the leveled concrete layer 5 so that one end 41x is in contact with the upper surface of the leveled concrete layer 5, and the connecting pipe 41 is installed on the leveled concrete layer 5 in the longitudinal direction by the leveled concrete layer 5. Positioning has been done.

In the connecting portion 40, between the inner peripheral surface 41b of the connecting pipe 41 and the outer peripheral surface 10a of the steel pipe pile 10 inserted into the inside of the connecting pipe 41 from one end portion 41x of the connecting pipe 41, the steel pipe pile 10 is formed. The filling portion g ₄ is provided so as to surround the outer peripheral surface 10a. Further, between the inner peripheral surface 41b of the connecting pipe 41 and the outer peripheral surface 20a of the steel pipe column 20 inserted into the inside of the connecting pipe 41 from the other end 41y of the connecting pipe 41, the outer peripheral surface of the steel pipe column 20 is formed. The filling portion g ₅ is provided so as to surround 20a. Further, a filling portion g ₆ communicating with each of the filling portions g ₄ and g ₅ is provided between the end portion 10x on the one end side of the steel pipe pile 10 and the end portion 20x on the one end side of the steel pipe column 20. There is. Then, each of the filling portions g ₄ , g ₅ and g ₆ is integrally filled with the filler 47 as in the above-described first embodiment.

Unlike the filler 37 of the above-mentioned first embodiment, the filler 47 of the fourth embodiment is filled in two portions. That is, the filler 47 is configured to include the first filler 47a filled for the first time and the second filler 47b filled for the second time. As the first filler 47a and the second filler 47b, for example, concrete is used as in the first embodiment described above.

It should be noted that each of the filling portions g ₄ , g _{5, and} g ₆ is also a region between the two parts (between the steel pipe pile 10 and the connecting pipe 31, between the steel pipe column 20 and the connecting pipe 31, and the steel pipe pile 10). (Between the steel pipe column 20 and the steel pipe column 20), which is a space area before the filler 47 is filled, but is a filling region after the filler 47 is filled.

Further, as in the third embodiment, the filling portion g ₆ is also provided at the lid 38 provided at the end 10x on the one end side of the steel pipe pile 10 and the lid 20x provided at the end 20x on the one end side of the steel pipe column 20. It is defined by 22.

The connecting pipe 41 of the fourth embodiment is provided with the first built-in spacer 34 for struts like the connecting pipe 31 of the first embodiment described above, but unlike the connecting pipe 31 of the first embodiment described above, it is a pile. The first and second built-in spacers 33a and 33b for use, and the support spacer 35 are not provided. The connecting pipe 41 of the fourth embodiment is provided with an inner peripheral rib 43 for reinforcement. The inner peripheral rib 43 is provided on the inner peripheral surface 41b of the connecting pipe 41 so as to project inward from the inner peripheral surface 41b in the vicinity of one end 41x side of the connecting pipe 41, and the circumference of the connecting pipe 41. It is continuously stretched in the direction Cd.

The inner peripheral rib 43 is filled with a filler 47 between the inner peripheral rib 43 and the outer peripheral surface 10a of the steel pipe pile 10 when the one end side of the steel pipe pile 10 is inserted into the inside of the connecting pipe 41 from the one end portion 41x of the connecting pipe 41. As such, it is separated from the outer peripheral surface 10a of the steel pipe pile 10.

≪Construction method of pile connecting strut structure≫
Next, the construction method of the pile connecting column structure 1C of the fourth embodiment will be described with reference to FIGS. 17, 18, and 19.

First, the same steps as in the first embodiment are carried out, and as shown in FIG. 17A, the steel pipe pile 10 is installed in the ground 2, the recess 4 and the leveled concrete layer 5 are formed. Also in this embodiment 4, the earth and sand 3 is not packed inside the steel pipe pile 10 as in the above-described third embodiment.

Next, as in the third embodiment described above, as shown in FIG. 17A, the inside of the steel pipe pile 10 is closed to the end portion 10x on one end side of the steel pipe pile 10 installed in the ground 2. The lid 38 is installed. The inside of the steel pipe pile 10 on one end side is sealed by the lid 38.

Next, similarly to the above-described first embodiment, one end side of the steel pipe pile 10 installed in the ground 2 is inserted into the inside of the connecting pipe 41 from the one end portion 41x in the longitudinal direction of the connecting pipe 41, and FIG. As shown in b), the connecting pipe 41 is installed on the leveled concrete layer 5 provided at the bottom of the recess 2b of the ground 2. _The connecting pipe 41 is installed so as to hold the filling portion g1 between the outer peripheral surface 10a of the steel pipe pile 10 and the inner peripheral surface 41b of the connecting pipe 41 over the circumferential direction Cd of the connecting pipe 41.
In this step, the positions of the steel pipe pile 10 in the X direction and the Y direction (horizontal direction Hd) are displaced from the predetermined positions due to the installation error (placing error) when the steel pipe pile 10 is installed in the ground 2. There may be. Even in such a case, the connecting pipe 31 can be installed at a predetermined position in the horizontal direction by adjusting the horizontal installation position of the connecting pipe 41 with respect to the installing position of the steel pipe pile 10. However, the adjustment of the horizontal installation position of the connecting pipe 41 is performed within the range of holding the filling portion g ₄ over the circumferential direction Cd of the connecting pipe 31.
Further, in this step, as in the above-described first embodiment, the relative height direction (Z direction) of the steel pipe pile 10 and the connecting pipe 31 is positioned by the installation reference surface of the leveled concrete layer 5. Can be done.

Next, as shown in FIG. 18A, with the lid 38 installed at the end 10x on one end side of the steel pipe pile 10 and the connecting pipe 41 installed on the leveled concrete layer 5, the steel pipe The first filler 47a before curing is filled over the filling portion g ₄ between the outer peripheral surface 10a of the pile 10 and the inner peripheral surface 41b of the connecting pipe 41 and the lid 38. The first filler 47a is injected into the inside from the other end 41y side of the connecting pipe 41. Then, the first filler 47a injected into the connecting pipe 41 flows over the filling portion g ₄ and the lid 38 due to its own weight, and the upper portion of the filling portion g ₄ and the lid 38 is the first filler. It is filled with 47a. For example, concrete is used as the first filler 47a.

In this step, since a lid 38 for closing the inside of the steel pipe pile 10 is provided on one end side of the steel pipe pile 10, the first filler 37a penetrates into the inside of the steel pipe pile 10 by the lid 38. Can be suppressed.

Next, the first filler 47a is cured. In the subsequent strut insertion step, the cured first filler 47a is used with the steel pipe strut 20 when the one end side of the steel pipe strut 20 in the longitudinal direction is inserted into the inside of the connecting pipe 41 from the other end 41y of the connecting pipe 41. Function as a support portion that supports the end portion 20x on one end side of the steel pipe column 20 apart from the end portion 10x on one end side of the steel pipe pile 10 so that the filling portion g ₅ is formed between the steel pipe pile 10 and the steel pipe pile 10. Has. That is, the filling portion _g6 is formed from the surface of the first filler 47a to the lid 38.

Next, one end side of the steel pipe column 20 is inserted from the other end 41y of the connecting pipe 41 installed on the leveled concrete layer 5 into the inside of the connecting pipe 41 until it comes into contact with the first filler 37a, and FIG. As shown in (b), the steel pipe column 20 is installed on the first filler 47a.

In this step, the first filler 47a filled inside the connecting pipe 41 enables the connecting pipe 41 to stably support the steel pipe column 20, and also the end portion 10x on one end side of the steel pipe pile 10 and the steel pipe. The filling portion g ₅ communicating with the filling portion g ₄ can be held between the end portion 20x on one end side of the support column 20.
Further, in this step, similarly to the above-described first embodiment, the first built-in spacer 34 for the support column provided on the inner peripheral surface 41b of the connecting pipe 41 and the support column provided on the outer peripheral surface 20a of the steel pipe support column 20. The filling portion g that communicates with the first filler 47a over the circumferential direction Cd of the connecting pipe 41 between the outer peripheral surface 20a of the support column 20 and the inner peripheral surface 31b of the connecting pipe 31 by the second built-in spacer 23. ₅ can be held, and the relative X-direction and Y-direction (horizontal direction) positioning of the steel pipe column 20 and the connecting pipe 41 can be performed. Further, the first filler 47a already filled inside the connecting pipe 41 enables the connecting pipe 41 to stably support the steel pipe column 20, and also the end portion 10x on one end side of the steel pipe pile 10 and the steel pipe column. It is possible to hold the filling portion g ₄ and the filling portion g ₆ communicating with the filling portion g ₅ between the end portion 20x on one end side of the 20.

Next, as shown in FIG. 19, the filling portion _g5 between the outer peripheral surface 20a of the steel pipe column 20 and the inner peripheral surface 41b of the connecting pipe 41 is filled with the second filler 47b. The second filler 47b is injected into the connecting pipe 41 from the other end 41y side of the connecting pipe 41. Then, the second filler 47b injected into the connecting pipe 41 flows through the filling portion g ₅ by its own weight, and the filling portion g ₅ is filled with the second filler 47b. For example, concrete is used as the second filler 47b.

Next, the second filler 47b is cured. As a result, each of the filling portions g ₄ , g ₅ and g ₆ is filled with the filler 47 including the first filler 47a and the second filler 47b. Further, a connecting portion 40 is formed in which the steel pipe column 20 is erected on the steel pipe pile 10 installed in the ground 2, and a pile connecting the steel pipe column 20 to the steel pipe pile 10 via the connecting portion 30. The connecting column structure 1C is almost completed.

After that, by forming the root-wound concrete layer 6 on the leveled concrete layer 5 so as to surround the steel pipe pile 10, the state shown in FIG. 16 is obtained.

<< Effect of Embodiment 4 >>
According to the pile connecting column structure 1C of the fourth embodiment and the construction method thereof, the same effect as that of the first embodiment can be obtained.
Further, according to the construction method of the pile connecting column structure 1C of the fourth embodiment, the X direction of the steel pipe pile 10 and the X direction due to the installation error (placing error) when the steel pipe pile 10 is installed in the ground 2 Even if the position in the Y direction (horizontal direction) deviates from the predetermined position, the connecting pipe 41 can be set in the horizontal direction by adjusting the horizontal installation position of the connecting pipe 41 with respect to the installing position of the steel pipe pile 10. It can be installed in a predetermined position.
The installation step of the lid 38 is preferably performed before the filling step of the filler 47a, but more preferably performed before the installation step of the connecting pipe 41 from the viewpoint of workability.

[Embodiment 5]
The pile connecting strut structure 1D of the fifth embodiment has substantially the same configuration as the pile connecting strut structure 1C of the above-described fourth embodiment, and the following configurations are different.
That is, as shown in FIG. 20, the pile connecting column structure 1D of the fifth embodiment is replaced with the lid 38 of the above-described fourth embodiment in order to suppress the intrusion of the filler 47a into the inside of the steel pipe pile 10. Therefore, for example, earth and sand 3 is packed as a filling material inside the steel pipe pile 10 in the same manner as in the first embodiment. Similar to the first embodiment, the earth and sand 3 is packed to a position similar to that of the surface layer portion 2a of the ground 2, for example. Then, the first filling is performed over the filling portion g ₄ between the outer peripheral surface 10a of the steel pipe pile 10 and the inner peripheral surface 41b of the connecting pipe 41, and the filling portion g ₆ on the end portion 10x on one end side of the steel pipe pile 10. The material 47a is filled, and further, the filling portion _g5 between the outer peripheral surface 20a of the steel pipe column 20 and the inner peripheral surface 41b of the connecting pipe 41 is filled with the second filling material 47b in connection with the first filling material 47a. ing.

The construction method of the pile connecting strut structure 1D of the fifth embodiment is almost the same as the construction method of the pile connecting strut structure 1C of the above-mentioned fourth embodiment, but FIGS. 21 (a), (b), and (c) are ), Before the step of filling the first filler 47a (FIG. 21 (c)), the step of packing the earth and sand 3 inside the steel pipe pile 10 installed in the ground 2 (FIG. 21 (a)). ). The stuffing step of the earth and sand 3 is preferably carried out before the filling step of the filler 47a, but is more preferably carried out before the installation step of the connecting pipe 41 (FIG. 21B) from the viewpoint of workability. ..
According to the pile connecting column structure 1D of the fifth embodiment and the construction method thereof, the same effect as that of the fourth embodiment can be obtained.

The connecting pipe 41 of the above-described embodiments 4 and 5 is provided with a built-in spacer for columns, but is not provided with a built-in spacer for piles. Therefore, as the connecting pipe for connecting the columns to the piles, it is preferable to include at least the built-in spacers for the columns among the built-in spacers for piles and the built-in spacers for columns.

[Modified example of the embodiment]
Next, a modification of the embodiment will be described.
<< Modification 1 >>
As shown in FIG. 12, the connecting portion 30 of the second embodiment described above includes a support spacer 35 joined to the inner peripheral surface 31b of the connecting pipe 31. Further, the steel pipe support column 20 of the above-described second embodiment is provided with a second built-in spacer 23 for the support column on the outer peripheral surface 20a.
On the other hand, as shown in FIGS. 22 (a) and 22 (b), the connecting portion 50a of the modified example 1 includes a spacer 51 instead of the support spacer 35. Further, the connecting portion 50a of the first modification is provided with the second built-in spacer 52 for the support instead of the second built-in spacer 23 for the support. Other configurations are the same as those in the second embodiment.

The spacer 51 is separated from the connecting pipe 31 and interposed between the concrete pile 15 and the steel pipe column 20, and holds the filling portion g ₃ between the concrete pile 15 and the steel pipe column 20. The spacer 51 has a structure in which the first support plate 51a extending in the X and Z directions and the second support plate 51b extending in the Y and Z directions intersect each other. Then, one end side of each of the first support plate 51a and the second support plate 51b is supported by the end portion 15x on the one end side of the concrete pile 15 in the Z direction, and the other end side opposite to each one end side. It supports the end portion 20x on one end side of the steel pipe column 20. It is preferable that the spacer 51 is installed in advance on either the concrete pile 15 or the steel pipe support 20 before inserting one end side of the steel pipe support 20 into the inside from the other end 31y of the connecting pipe 31. The width of the filling portion g ₃ is defined by the height of the spacer 51 in the Z direction.

The second built-in spacer 52 for struts is provided on the inner peripheral surface 31b of the connecting pipe 31 so as to project inward from the inner peripheral surface 31b in the vicinity of the central portion in the longitudinal direction of the connecting pipe 31. Further, four second built-in spacers 52 for struts are arranged at equal intervals, for example, in the circumferential direction Cd of the connecting pipe 31, similar to the first built-in spacers 34 for struts. Further, the second built-in spacer 52 for columns is formed of, for example, the same material as the connecting pipe 31, and is integrally joined to the inner peripheral surface 31b of the connecting pipe 31 by welding.

When the one end side of the steel pipe support 20 is inserted into the inside of the connecting pipe 31 from the other end 31y of the connecting pipe 31, the second built-in spacer 52 for the support is used together with the first built-in spacer 34 for the support of the steel pipe support 20. The filling portion g ₂ is held between the outer peripheral surface 20a and the inner peripheral surface 31b of the connecting pipe 31.

Also in this modification 1, the same effect as that of the above-mentioned second embodiment can be obtained. And this modification 1 can also be applied to the above-described first and third embodiments.
Further, according to this modification 1, since the spacer 51 is separated from the connecting pipe 31, it is necessary to adjust the position of the steel pipe column 20 in the height direction at the height of the surface of the concrete layer 5. It can be adjusted by the height of the spacer 51. Therefore, it is effective when the ground 2 is soft and the leveled concrete layer 5 is easily deformed, and the height is difficult to adjust due to the unstable and leveled concrete layer 5. Further, since the second built-in spacer 52 for the support is not mounted so as to project from the outer peripheral surface of the steel pipe support 20, the steel pipe support 20 is transported, stored and installed in the steel pipe support 20 as compared with the case of the second embodiment. It is not necessary to consider the protrusions on the outer peripheral surface 20a, and the workability can be improved.

<< Modification 2 >>
As shown in FIG. 22, in the above-mentioned modification 1, a steel pipe column 20 having the same outer diameter as the concrete pile 15 is used.
On the other hand, as shown in FIGS. 23 (a) and 23 (b), in this modification 2, a steel pipe column 25 having an outer diameter smaller than the outer diameter of the concrete pile 15 is used. Further, in this modification 2, in the first built-in spacer 34 for the support and the second built-in spacer 52 for the support, the amount of protrusion inward from the inner peripheral surface 31b of the connecting pipe 31 is the outer diameter of the steel pipe support 25. It is increased more than the modification 1 according to the above. Similar to the steel pipe column 20, the steel pipe column 25 is mainly composed of a steel pipe having a circular outer peripheral surface 25a and an inner peripheral surface 25b in a cross section that penetrates in the longitudinal direction and is orthogonal to the longitudinal direction.

In this modification 2, the same effect as that of the above-mentioned modification 1 can be obtained, and a steel pipe column having an outer diameter smaller than the outer diameter of the concrete pile 15 can be used. Further, this modification 2 can also be applied to the above-described embodiments 1 to 5.
Further, according to this modification 2, since the outer diameter of the column can be made different from the outer diameter of the pile, the degree of freedom in selecting the outer diameter of the column suitable for the design conditions can be improved, and the economy and safety can be improved. Improved design is possible.

<< Modifications 3 and 4 >>
As shown in FIG. 23, in the above-described second embodiment, a steel pipe column 25 having a circular outer peripheral surface 25a and an inner peripheral surface 25b is used in a cross section orthogonal to the longitudinal direction. On the other hand, as shown in FIG. 24, in the modified example 3, a steel pipe support column 26 having a rectangular outer peripheral surface 26a and an inner peripheral surface 26b is used in a cross section orthogonal to the longitudinal direction.
On the other hand, as shown in FIG. 25, in the modified example 4, a steel column 27 having an H-shaped cross section orthogonal to the longitudinal direction is used.

In any of the modified examples 3 and 4, the same effect as that of the above-mentioned modified example 2 can be obtained. Then, any of the modifications 3 and 4 can be applied to the above-described embodiments 1 to 5.
Further, according to the modifications 3 and 4, the present invention can be applied even when the pillars of buildings such as offices, warehouses, and stores are square steel pipes or H-shaped steel, and a wide range of applications and structures can be applied. The effect of reducing the construction cost and construction period can be obtained for the building structures and civil engineering structures of.

<< Modification 5 >>
As shown in FIG. 23, the connecting portion 50a of the above-mentioned modification 2 is a first built-in spacer 34 for a support, a second built-in spacer 52 for a support, and a pile, which are joined to the inner peripheral surface 31b of the connecting pipe 31. Each of the first and second built-in spacers 33a and 33b is provided. On the other hand, as shown in FIG. 26, the connecting portion 50b of the modified example 5 is separated from the connecting pipe 31 and is separated from the connecting pipe 31, the first and second built-in spacers 34 and 52 for columns, and the first and second built-in spacers for piles. Each of the built-in spacers 33a and 33b includes a spacer structure 55 provided on the base member 56. The base member 56 extends from one end 31x side of the connecting pipe 31 to the other end 31y side inside the connecting pipe 31, and the end located on the other end 31y side of the connecting pipe is the other side of the connecting pipe 31. It is supported by the end 31y. A plurality of the spacer structures 55 are arranged at predetermined intervals in the circumferential direction Cd of the connecting pipe 31. In this modification 5, for example, four connecting pipes 31 are arranged at equal intervals in the circumferential direction Cd.

Also in this modification 5, the same effect as that of the above-mentioned modification 2 can be obtained. Further, this modification 5 can also be applied to the above-described embodiments 1 to 5.
Further, according to this modification 5, the first and second built-in spacers 34 and 52 for columns and the first and second built-in spacers 33a and 33b for piles can be processed and mounted on the connecting pipe 31 by welding or the like. It becomes unnecessary and the processing and manufacturing cost of the connecting pipe can be reduced.
In addition, you may construct a multiple structure by connecting adjacent spacer structures 55 with a connecting member.

Although the present invention has been specifically described above based on the above-described embodiment, the above-mentioned embodiment, and the above-mentioned modification, the present invention is not limited to the above-mentioned embodiment, the above-mentioned embodiment, and the above-mentioned modification, and the gist thereof is described. Of course, various changes can be made within a range that does not deviate.

For example, the present invention relates to a pile connecting strut structure used for installing lighting equipment, signs, railway overhead lines, etc., a pile connecting strut structure such as a bridge pedestal, a steel tower, and a pile connecting used for constructing a building, a road, or the like. It can be applied to pillar structures and pile connecting pillar structures that support the roof.

1,1A, 1B, 1C, 1D ... Pile connecting strut structure 2 ... Ground 2a ... Surface layer 2b ... Drilling hole 3 ... Sediment (stuffing material)
4 ... Recessed 5 ... Leveled concrete layer 6 ... Neck-wound concrete layer 10 ... Steel pipe pile 10a ... Outer peripheral surface 10b ... Inner peripheral surface 10x ... End 15 ... Concrete pile 15a ... Outer peripheral surface 15b ... Inner peripheral surface 15x ... End 20 ... Steel pipe strut 20a ... Outer peripheral surface 20b ... Inner peripheral surface 20x ... End 22 ... Lid 23 ... Second built-in spacer for strut 25, 26, 27 ... Steel pipe strut 30 ... Connecting part 31 ... Connecting pipe 31a ... Outer peripheral surface 31b ... Inner peripheral surface 33a ... 1st built-in spacer for piles 33b ... 2nd built-in spacer for piles 34 ... 1st built-in spacer for columns 35 ... Support spacer 37 ... Filling material 38 ... Lid 40 ... Connecting part 41 ... Connecting Pipe 41a ... Outer peripheral surface 41b ... Inner peripheral surface 43 ... Inner peripheral rib 47 ... Filling material 47a ... First filling material 47b ... Second filling material 50a, 50b ... Connecting portion 51 ... Spacing spacer 51a ... First support plate 51b ... 2nd support plate 52 ... 2nd built-in spacer for pillar 55 ... Spacer structure 56 ... Base member 61 ... Ball-proof net 62a, 62b, 62c ... Split pillar

Claims (9)

It is provided with a pile installed in the ground and a support column connected to one end side of the pile via a connecting portion.
The connecting portion includes a connecting pipe in which one end side of the pile is inserted into the inside from one end portion in the longitudinal direction and one end side of the column is inserted from the other end portion on the opposite side to the one end portion in the longitudinal direction.
In the connecting pipe, the filler filled between the pile and the support and the connecting pipe, and between the pile and the support,
Equipped with
The connecting pipe is a pile connecting column structure comprising a support spacer for supporting the column and holding a filling portion of the filler between the column and the pile. The pile insertion length at which one end side of the pile is inserted into the inside of the connecting pipe is 1.5 times or more the outer diameter of the pile.
The pile connecting strut structure according to claim 1, wherein the strut insertion length at which one end side of the strut is inserted into the connecting pipe is 1.5 times or more the outer diameter of the strut. The pile connecting strut structure according to claim 2, wherein the filler is concrete or mortar having a compression reference strength of 18 N / mm ² or more. The connecting pipe holds a built-in spacer for piles that holds a filling portion of the filling material between the connecting pipe and the pile, and holds a filling portion of the filling material between the connecting pipe and the support column. The pile connecting strut structure according to any one of claims 1 to 3, further comprising at least a strut built-in spacer among the strut built-in spacers. The connecting portion is separated from the connecting pipe and arranged between the pile and the support column, and while supporting the support column and holding the filling portion of the filler between the pile and the support column. The pile connecting strut structure according to any one of claims 1 to 4, further comprising a seat spacer. The connecting portion holds a built-in spacer for piles that holds a filling portion of the filling material between the connecting pipe and the pile, and holds a filling portion of the filling material between the connecting pipe and the support column. The claim is characterized in that it has at least a built-in spacer for a support among the built-in spacers for a support, and further includes a spacer structure separated from the connecting pipe and arranged inside the connecting pipe. 5. The pile connecting column structure according to 5. The pile is formed in a tubular shape
The pile connecting strut structure according to any one of claims 1 to 6 , wherein a lid is installed on one end side of the pile in the longitudinal direction so as to close the inside of the pile. body. The pile connecting column structure according to any one of claims 1 to 7 , wherein the pile is a tubular concrete pile. A process of inserting one end side of a pile installed in the ground into the inside of the connecting pipe from one end in the longitudinal direction of the connecting pipe and installing the connecting pipe on the ground.
A step of inserting one end side of a strut into the inside of the connecting pipe from the other end on the opposite side of the one end in the longitudinal direction of the connecting pipe installed on the ground and installing the strut on the pile. ,
A step of filling the filler between the pile and the column and the connecting pipe, and between the pile and the column, and curing the filler.
Equipped with
The connecting pipe is provided with a support spacer for supporting the support column, and the connecting pipe is provided with a support spacer.
A method for constructing a pile connecting column structure , wherein the step of installing the column is to insert the column into the connecting pipe until one end of the column abuts on the support spacer .

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