JP2020094399A - Post structure connected to pile, and construction method thereof - Google Patents

Abstract

To reduce cost of a post structure connected to a pile.SOLUTION: A post structure 1 connected to a pile comprises: a steel pipe pile 10 installed in the ground 2 as a pile; and a steel pipe post 20 whose one end side is connected to one end side of the steel pipe pile 10 via a connection portion 30 as a post. The connection portion 30 includes: a connection pipe 31 into which one end side of the steel pipe pile 10 is inserted from one end side in a longer direction and into which one end side of the steel pipe post 20 is inserted from the other end side that is an opposite side to one end side in the longer direction; and a filling material 37 filled inside the connection pipe 31 between each of the steel pipe pile 10 and the steel pipe post 20 and the connection pipe 31, and between the steel pipe pile 10 and the steel pipe post 20.SELECTED DRAWING: Figure 2

Description

The present invention relates to a pile connecting strut structure and a construction method thereof, and in particular, it is applied to a pile coupling strut structure in which a strut is connected to a pile installed in the ground (under the ground) via a connecting portion and a construction method thereof. It is related to effective technology.

Building structures and civil engineering structures are provided with a structure (hereinafter referred to as a pile connection support structure) in which a support is connected to a pile installed in the ground through a connection portion. Various structures have been proposed and put to practical use in the connection portion of the pile connection support structure. For example, in Patent Document 1, one end side of a steel pipe pillar is inserted (inserted) into the inside from an end portion on one end side of a steel pipe pile installed in the ground, and an inner peripheral surface of the steel pipe pile and an outer peripheral surface of the steel pipe pillar. There is disclosed a technique of constructing a connection part by filling concrete as a filler in a filling part (separation part) between and. According to the connection part of this patent document 1, compared with the case where a steel pipe pile and a steel pipe support|pillar are connected by a bolt or welding, a construction period and construction cost can be reduced significantly.

JP2012-52383A

However, since the connecting portion of Patent Document 1 has a structure in which the steel pipe support is inserted into 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 support. Moreover, since the connection part of patent document 1 is a structure which fills the filling part between the inner peripheral surface of a steel pipe pile and the outer peripheral surface of a steel pipe support|pillar with concrete, an outer diameter changes according to the width of a filling part. It was necessary to use steel pipe piles that were larger than the outer diameter of the steel pipe columns. In particular, in order to widen the width of the filling portion so that concrete can be smoothly filled, it was necessary to use a steel pipe pile having an outer diameter sufficiently larger than the outer diameter of the steel pipe support. 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 support, 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 must be increased according to the size of the outer diameter of the steel pipe pile, which increases the installation cost of the steel pipe pile. The increase in the 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. There was room for

In addition to steel pipe piles, concrete piles are known as piles installed in the ground, but this concrete pile is thicker than steel pipe piles (thickness) and compared with 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 in accordance with 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 inventors of the present invention made the present invention by paying attention to the connecting portion that connects the pillar to the pile.
An object of the present invention is to provide a technique capable of reducing the cost of a pile connecting strut structure.

The pile connection pillar structure concerning one mode of the present invention is provided with the pile installed in the ground, and the pillar which one end side was connected to the one end side of this pile via a connection part. Then, the connecting portion is 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 pillar is inserted into the inside from the other end portion opposite to the one end portion in the longitudinal direction, and the connecting pipe. In the pipe, there is provided a filling material filled between the pile and the pillar and the connecting pipe, and between the pile and the pillar.

Further, the method for constructing a pile connection support structure according to an aspect of the present invention, the one end side of the pile installed in the ground is inserted into the inside from one end in the longitudinal direction of the connection pipe to form the connection pipe on the ground. A step of installing, and a step of inserting the one end side of the pillar into the connecting pipe from the other end on the side opposite to the one end in the longitudinal direction of the connecting pipe installed on the ground to install the pillar on the pile, Filling the filler between the piles and the columns and the connecting pipes, and between the piles and the columns, and hardening the filler.

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

It is a figure which shows the whole structure of the pile connection pillar structure which concerns on Embodiment 1 of this invention. It is a principal part sectional view which shows the cross-section along the longitudinal direction of the connection part of FIG. It is a principal part sectional view which expanded a part of FIG. The figure which shows the cross-section structure cut|disconnected at the position of each cutting line of FIG. 3 ((a) is sectional drawing cut|disconnected 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 cross-sectional view taken at the IV-IV cutting line position, (d) is a cross-sectional view taken at the V-V cutting line position, and (e) is a cross-sectional view taken at the VI-VI cutting line position. Figure). It is a principal part sectional view which shows the sectional structure in a different position with respect to FIG. It is a figure which shows the stress state which acts on the connection part of the pile connection support structure which concerns on Embodiment 1 of this invention ((a) is sectional drawing which follows a longitudinal direction, (b) is sectional drawing orthogonal to a longitudinal direction). .. It is a figure which shows distribution of the bending moment which acts on the pile connection pillar structure which concerns on Embodiment 1 of this invention. It is a figure which shows the relationship between pm+ps [N/mm< ² >] and insertion length L. It is a figure for demonstrating the construction method of the pile connection pillar structure which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the construction method of the pile connection pillar structure which concerns on Embodiment 1 of this invention. It is sectional drawing for demonstrating the construction method of the pile connection pillar structure which concerns on Embodiment 1 of this invention. The figure which shows the schematic structure of the pile connection pillar structure which concerns on Embodiment 2 of this invention ((a) is sectional drawing of the principal part which follows a longitudinal direction, (b) cut|disconnected in the position of the VII-VII line of (a). FIG. It is a principal part sectional view which shows schematic structure of the pile connection pillar structure which concerns on Embodiment 3 of this invention. It is sectional drawing for demonstrating the construction method of the pile connection pillar structure which concerns on Embodiment 3 of this invention. It is sectional drawing for demonstrating the construction method of the pile connection pillar structure which concerns on Embodiment 3 of this invention. It is a principal part sectional view which shows schematic structure of the pillar connection pillar structure which concerns on Embodiment 4 of this invention. It is sectional drawing for demonstrating the construction method of the pile connection pillar structure which concerns on Embodiment 4 of this invention. It is sectional drawing for demonstrating the construction method of the pile connection pillar structure which concerns on Embodiment 4 of this invention. It is sectional drawing for demonstrating the construction method of the pile connection pillar structure which concerns on Embodiment 4 of this invention. It is a principal part sectional view which shows schematic structure of the pile connection pillar structure which concerns on Embodiment 5 of this invention. It is sectional drawing for demonstrating the construction method of the pile connection pillar structure which concerns on Embodiment 5 of this invention. It is a figure ((a) is an important section sectional view which meets a longitudinal direction, and (b) is a sectional view cut at a position of a VIII-VIII cutting line of (a)) showing modification 1 of an embodiment of the present invention. FIG. 8 is a view showing a second modified example of the embodiment of the present invention ((a) is a cross-sectional view of a main part along the longitudinal direction, (b) is a cross-sectional view taken along the line IX-IX of (a)). It is sectional drawing which shows the modification 3 of embodiment of this invention. It is sectional drawing which shows the modification 4 of embodiment of this invention. The figure which shows the modification 5 of the pile connection pillar structure which concerns on embodiment of this invention ((a) is a principal part sectional drawing along a longitudinal direction, (b) cut|disconnects in the position of the XI-XI cutting line of (a). It is a 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 embodiments of the present invention, components having the same function are designated by the same reference numeral, and the repeated description thereof will be omitted.
In addition, each drawing is schematic and may differ from the actual one.
Further, the following embodiments exemplify devices and methods for embodying the technical idea of the present invention, and the configurations are not limited 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 embodiments, in three directions orthogonal to each other in space, a first direction and a second direction orthogonal to each other in the same plane are defined as an X direction and a Y direction, respectively. A third direction orthogonal to each of the second directions is the Z direction.

[Embodiment 1]
In the first embodiment, a case will be described in which the present invention is applied to a pile connection pillar structure that constructs a ball-proof net structure as a building structure.

≪Ballproof net structure≫
First, the ball-proof net structure will be described before describing the pile connection column structure and the construction method thereof.

In 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 and outside the course. A ball-proof net 61 is stretched over each of the golf balls to prevent the golf ball from flying out of the field. In this type of pile connection strut structure 1, since the height of the steel pipe strut 20 as a strut to be erected on the ground reaches several tens of meters, a plurality of divided strut having a transportable length, for example, 5 m to 10 m is used. The pillars are constructed by sequentially connecting them locally. In the first embodiment, for example, the three divided columns 62a to 62c are connected in this order to construct the steel pipe column 20.

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

As shown in FIG. 1, FIG. 2 and FIG. 3, the pile connection strut structure 1 of this Embodiment 1 is a steel pipe pile 10 as a pile installed in the ground 2 (under the ground), and this steel pipe pile 10 The steel pipe column 20 is provided as a column whose one end side is connected to one end side via a connecting portion 30.

The steel pipe pile 10 is embedded in the ground 2 such that an end 10x on one end side in the longitudinal direction (Z direction) projects upward from the ground 2 and extends along the vertical direction Vd. The steel pipe column 20 is arranged on the steel pipe pile 10 such 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 standing.

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

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

≪Steel pipe piles≫
As shown in Drawing 2, Drawing 3, Drawing 4 (d), and (e), steel pipe pile 10 penetrates along a longitudinal direction, and in the section which intersects perpendicularly with the longitudinal direction, outer peripheral surface 10a and inner peripheral surface 10b. Is mainly composed of a circular steel pipe.

The inside (through hole) of the steel pipe pile 10 is filled with, for example, earth and sand 3 as a filling material. The earth and sand 3 is one step lower than the end 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 a filler 37 described below 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), (b), the steel pipe 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 the end 20x on the one end side in the longitudinal direction so as to close the inside. The lid 22 suppresses a filler 37, which will be described later, from entering the inside of the steel pipe column 20.

≪Connecting part≫
As shown in FIG. 2, FIG. 3 and FIG. 4A to FIG. 4E, one end side of the steel pipe pile 10 is inserted into the connecting portion 30 from one end 31x in the longitudinal direction (Z direction), and the longitudinal direction. The connecting pipe 31 having the one end side of the steel pipe strut 20 inserted therein is provided from the other end portion 31y opposite to the one end portion 31x. 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 strut 20 and the connecting pipe 31, and between the steel pipe pile 10 and the steel pipe strut 20. The filling material 37 is filled.

The connecting pipe 31 is mainly composed of a steel pipe having a circular outer peripheral surface 31a and an inner peripheral surface 31b, which penetrates in the longitudinal direction (X direction) and is orthogonal to the longitudinal direction. The connection pipe 31 is installed on the leveling concrete layer 5 such that one end 31x is in contact with the upper surface of the leveling concrete layer 5, and the leveling concrete layer 5 positions the pipe in the longitudinal direction. That is, the leveling concrete layer 5 serves as an installation reference surface when the one end side of the steel pipe pile 10 is inserted into the inside of the connection pipe 31 from the one end 31x of the connection pipe 31 to install the connection pipe 31.

In the connecting portion 30, 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 31x of the connecting pipe 31, the outer periphery of the steel pipe pile 10 is 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 is provided. A filling part g ₂ is provided so as to surround the. Further, the end portions 10x of the one end of the steel pipe pile 10, between the one end side of the end portion 20x of the steel pipe column 20, is provided filling portion g ₃ in communication with each of the filling portion g ₁ and g ₂ There is. Then, as shown in FIG. 5, each of the filling parts g ₁ , g ₂ and g ₃ is integrally filled with the above-mentioned filling material 37.

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

In addition, each of the filling parts g ₁ , g _2, g ₃ is a region between the two parts (between the steel pipe pile 10 and the connecting pipe 31, between the steel pipe support 20 and the connecting pipe 31, and the steel pipe pile 10). Between the steel pipe support 20), it is a space region before the filling material 37 is filled, but becomes a filling region after the filling material 37 is filled.

Moreover, in this Embodiment 1, since the lid 22 is installed at the end 20x on the one end side of the steel pipe support 20, the width of the filling portion g ₃ of this embodiment is the end on the one end side of the steel pipe pile 10. 10x and the lid 22 installed at the end 20x on the one end side of the steel pipe column 20.

<< Built-in spacer and support spacer >>
As shown in FIGS. 3 and 4(d) and (e), the connecting pipe 31 is inserted into the connecting pipe 31 from one end 31x of the connecting pipe 31 when the one end side of the steel pipe pile 10 is inserted. The first built-in spacer 33a for piles (see FIG. 4(e)) and the second built-in spacer 33b for piles (see FIG. 4(e)) that holds the filling part g ₁ between the outer peripheral surface 10a of the No. 3 and the inner peripheral surface 31b of the connecting pipe 31. 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 the one end 31x side of the connecting pipe 31. The second built-in spacer 33b for piles is provided in 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, when the connecting pipe 31 is inserted into the connecting pipe 31 from the other end 31 y of the connecting pipe 31, one end side in the longitudinal direction of the steel pipe strut 20 is inserted. A first built-in spacer 34 for a column that holds the filling portion g ₂ between the outer peripheral surface 20 a of the column 20 and the inner peripheral surface 31 b of the connecting pipe 31 is further provided. The first built-in spacer 34 for the pillar is provided on the inner peripheral surface 31b of the connecting pipe 31 in the vicinity of the other end 31y side of the connecting pipe 31 so as to project inward from the inner peripheral surface 31b.

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 connecting pipe 31, one end side in the longitudinal direction of the steel pipe strut 20 is inserted, A support spacer 35 that supports the end portion 20x on one end side of the steel pipe strut 20 and holds 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 one end side of the steel pipe strut 20 is provided. Further equipped. 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), (c) to (e), each of the first supporting spacer for pillars 34, the supporting spacer 35, the first and second mounting spacers for piles 33a, 33b is a connecting pipe. A plurality of 31 are arranged at predetermined intervals in the circumferential direction Cd. In this Embodiment 1, each of the first built-in spacers 34 for pillars, the support spacers 35, and the first and second built-in spacers 33a, 33b for piles are four at equal intervals in the circumferential direction Cd of the connecting pipe 31. However, it is not limited to this, and at least three or more may be arranged.

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

As shown in FIG. 3 and FIG. 4B, the steel pipe support column 20 has an outer peripheral surface of the steel pipe support column 20 when one end side of the steel pipe support column 20 is inserted into the connection pipe 31 from the other end 31 y of the connection pipe 31. It further includes a second built-in spacer 23 for a column that holds the filling part g ₂ between 20 a and the inner peripheral surface 31 b of the connecting pipe 31. The second built-in spacer 23 for the support column is provided on the outer peripheral surface 20a of the steel pipe support column 20 so as to project outward from the outer peripheral surface 20a in the vicinity of the end on the one end side in the longitudinal direction of the steel pipe support column 20. .. Also in this 2nd built-in spacer 23 for pillars, similarly to each of the above-mentioned 1st built-in spacer 34 for pillars, the support spacer 35, and the 1st and 2nd built-in spacers 33a, 33b for piles, of the steel pipe pillar 20. Although four are arranged at equal intervals in the circumferential direction, it is not limited to this, and at least three or more may be arranged.

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

As shown in FIGS. 4( a) and 4 (b ), when the steel pipe support column 20 is inserted from the other end 31 y of the connection pipe 31 into the connection pipe 31, one end side of the steel pipe support column 20 is inserted. So that the second built-in spacers 23 for columns do not come into contact with the first built-in spacers 34 for columns of the connecting pipe 31. The second built-in spacers 23 for columns are connected to the first built-in spacers 34 for columns. The reference numeral 31 is inserted with its position displaced in the circumferential direction Cd.
Moreover, in this Embodiment 1, the steel pipe pile 10 and the steel pipe support|pillar 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 g ₁ and g ₂ are formed between the pipe pipe 10 and the steel pipe column 20. And the outer diameter.
Further, the connecting pipe 31 will be described with reference to FIG. 5. One end portion 10x on one end side of the steel pipe pile 10 inserted inside from the one end portion 31x and the steel pipe column 20 inserted inside from the other end portion 31y. as filling portion g ₃ between one end side of the end portion 20x is formed, the pile insertion length L1 of the steel pipe pile 10 is inserted into the connecting pipe 31, the steel pipe column 20 is inserted into the connecting pipe 31 The length is longer than the sum of the column insertion length L2.

≪Strength of connecting part≫
Next, the strength of the connecting portion 30 will be described with reference to FIGS.
In FIG. 6, Dc is the outer diameter of the steel pipe support 20, tc is the plate thickness of the steel pipe support 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 from one end 31x of the connecting pipe 31 into the connecting pipe 31, and L2 is a steel pipe from the other end 31y of the connecting pipe 31 to the inside of the connecting pipe 31. The length of the column into which one end of the column is inserted, LT is the length from one end 31x to the other end 31y of the connecting pipe 31, 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 support 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 of the filler 37 with respect to the vertical force N, pm is the maximum compressive stress of the filler 37 due to bending moment, and ps is the compressive stress of the filler 37 due to shearing force.
Further, S1 is a shear stress of the filler 37, cs is a compressive stress of the filler 37, and W is an action width in which the compressive stress acts on the filler 37 in a cross section orthogonal to the longitudinal direction of the connecting pipe 31.
In order to make the drawing easier to see, hatching of the filler 37 is omitted in FIG.

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

Therefore, referring to FIGS. 6A and 6B, when the bending moments M1 and M2 acting on the connecting pipe 31 from the steel pipe support 20 or the steel pipe pile 10 are M, the filler of the connecting portion 30 is described. The compressive stress generated in 37 is assumed to have a triangular distribution. Then, each of the pile insertion length L1 and the column insertion length L2 is L, the maximum value of the compressive stress generated in the filler 37 (maximum compressive stress) is pm, and in the cross section orthogonal to the longitudinal direction of the connecting pipe 31. If the width of action of the compressive stress acting on the filler 37 is W,
The resultant force F of the compressive stress acting on the filling material 37 is
F=1/2・(pm・W・L/2)=1/4・pm・W・L
Can be obtained with.
Since the arm length of the resultant force of the reaction force in the filler 37 (the interval between the left and right resultant forces) is 2/3·L,
The couple Fp is
Fp=F・2/3=1/6・pm・W・L ²
Can be obtained with.
Since this couple Fp balances with the bending moment M of the steel pipe support 20, the maximum compressive stress pm of the filler 37 is obtained by 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 filling material 37 is obtained by 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 (compression generated in the filler 37 with respect to the shearing force S expressed by the above equation (2) If the value (Pm+Ps) obtained by adding the values 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 more than the bending moment of the steel pipe support 20, the connecting pipe 31 and the steel pipe pile 10 are safe, and the steel pipe support 20 via the connecting pipe 31. The structure for 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.

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

Further, for the shearing force S, the shearing strength of the connecting pipe 31 may be larger than the shearing 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 specification is not limited to this one specification. In FIG. 7, Ns is a design vertical force, Ss is a design shear force, and Ms is a design bending moment at the connecting portion 30.

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

<Conditions for steel pipe support>
As conditions for 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=800mm
Plate thickness: tp=14 mm
Material: SM490A
And

<Conditions of connection part>
As a condition of the connecting pipe 31,
Insertion length (insertion length) of steel pipe piles and steel pipe columns to the connecting pipe: L
Outer diameter: Dj=1000mm
Plate thickness (wall thickness): tj=14 mm
Cross-sectional area: As=43960 mm ²
Section coefficient: Z=105×10 ⁻⁴ m ³
Material: SKK490
Allowable tensile stress degree: σs=325 N/mm ²
Allowable shear stress degree: τs=187 N/mm ²
And

<Concrete conditions>
As conditions for the concrete (filled concrete) used as the filler 37,
Compression standard strength: 18N/mm ²
Allowable compressive stress level: σc=12 N/mm ²
Allowable shear stress: τc=1.2 N/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)
= 239255 mm ²
And

<Load conditions>
As the 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

<Study 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 compressive stress level of the filled concrete is expressed by the above equation (1).
pm=6√2·M/(Dp·L ² )
In this study, since Ms=1581 kN·m and Dp=800 [mm],
pm=6√2·Ms/(Dp·L ² )
=6√2·1581000000/(800·L ² )
=16766505/L ²
Becomes

On the other hand, the compressive stress ps of the filler 37 due to the designed shear force is calculated from the above equation (2) by
ps=√2·Ss/(Dp·L)
=1.414/107000/(800・L)
=189/L
Becomes
Therefore, the maximum compressive stress degree pm+ps of the filled concrete is given by the following equation.
pm+ps=16766505/L ² +189/L

Here, the relationship between pm+ps [N/mm ² ] and the insertion length L of the steel pipe pile 10 or the steel pipe support 20 inside the connecting pipe 31 is shown in FIG. 8.
From FIG. 8, the allowable compressive stress σc of the filled concrete is
Since σc=12 N/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=16766505/1200 ² =11.64 N/mm ²
ps=189/1200=0.16 N/mm ²
pm+ps=11.64+0.16
^{= 11.8N / mm 2 ≦ 12N /} mm 2
And is good.

<Study 2; Examination of compressive strength of filled concrete against vertical force>
When the design vertical force Ns is Ns=60 kN,
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=3.14×800×800/4=502400 [mm ² ]
Therefore,
The axial compressive stress σn of the filled concrete is
σn=Ns/A1=0.12N/mm ² ≦σc=12N/mm ²
And is good.

<Study 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 against the bending moment is
F=1/4・pm・Dp/√2・1200
=1/4・11.64・800/1.414・1200=1975672N
Becomes
Then, the shearing force S1 acting on the connecting pipe 31 is
S1=Ss+F=2082672N
Becomes

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

<Study 4; Examination of bending strength of connecting pipe>
When the design bending moment Ms is Ms=1581 [kN·m],
Since the section modulus Z is Z=105×10 ⁻⁴ m ³ ,
The bending stress σ is
σ=Ms/Z=1581/0.0105=150571 kN/m ^{2
= 151N / mm 2 ≦ σs =} 325N / mm 2
And is good.

<Results of study>
From the results of the above-mentioned examinations 1 to 4, the specifications of the connecting portion 30 are determined as follows.
(Connection pipe)
Steel pipe material: SM490A
Outer diameter: 1000 [mm]
Plate thickness: 14 [mm]
Length: 1200×2+400=2800mm
(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 connection pipe 31 from the one end 31x of the connection 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 connection pipe 31 from the other end 31y of the connection pipe 31 is 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 same specifications are obtained.

≪Construction method of pile connection pillar structure≫
Next, a construction method of the pile connection strut structure 1 of Embodiment 1 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 such that the end 10x on the one end side projects from the ground 2 and extends along the vertical direction Vd. The steel pipe pile 10 is installed by, for example, 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. It is performed by backfilling the gap between 2b and the steel pipe pile 10. Concrete or mortar may be filled between the drill hole 2b and the steel pipe pile 10.

Next, as shown in FIG. 9B, the steel pipe pile 10 installed in the ground 2 is filled with, for example, earth and sand 3 generated at the time of excavation of the excavation hole 2b as a filling material. It is preferable to pack the soil 3 to a position lower by one step from the end 10x on the one end side of the steel pipe pile 10, for example, to a position similar to the surface layer 2a of the ground 2. Further, the step of filling the earth and sand 3 is preferably performed before the step of filling the filling material 37 described later, but is more preferably performed before the installation of the connecting pipe 31 described later from the viewpoint of workability. The earth and sand 3 function as a suppressing portion that suppresses the infiltration of the filler 37 into the inside of the steel pipe pile 10 in the step of filling 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 concave portion 4 surrounding the steel pipe pile 10 in the ground 2, and thereafter, as shown in FIG. A leveling concrete layer 5 is formed by casting on the bottom of No. 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 one end 31x in the longitudinal direction of the connecting pipe 31, and as shown in FIG. 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 such that one end 31x in the longitudinal direction is in contact with the upper surface of the leveling concrete layer 5.
In this step, between the outer peripheral surface 10a of the steel pipe pile 10 and the inner peripheral surface 31b of the connecting pipe 31 by the first built-in spacer 33a and the second built-in spacer 33b for piles provided inside the connecting pipe 31. The filling part g ₁ can be held over the circumferential direction Cd of the connecting pipe 31, and the relative positioning of the steel pipe pile 10 and the connecting pipe 31 in the X and Y directions 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 of the leveling concrete layer 5.
Moreover, in this process, since the pile first built-in spacer 33a and the pile second built-in spacer 33b are separated in the longitudinal direction of the connecting pipe 31, the pile first built-in spacer 33a and the pile built-in spacer 33a are separated. By the second built-in spacer 33b, the central axis in the longitudinal direction of the connecting pipe 31 can be easily aligned with the central axis in the longitudinal direction 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 leveling concrete layer 5 into the inside of the connecting pipe 31 until it abuts on the support spacer 35, and then, as shown in FIG. ), the steel pipe column 20 is installed on the steel pipe pile 10. The steel pipe support 20 is installed along the vertical direction Vd. A lid 22 is installed in advance on one end 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 pillar is formed by the support pillar first built-in spacer 34 provided on the inner peripheral surface 31b of the connecting pipe 31 and the support pillar second built-in spacer 23 provided on the outer peripheral surface 20a of the steel pipe support pillar 20. The filling part g ₂ can be held between the outer peripheral surface 20a of 20 and the inner peripheral surface 31b of the connecting pipe 31 in the circumferential direction Cd of the connecting pipe 31 (FIGS. 4A and 4B). It is possible to perform relative positioning between the steel pipe column 20 and the connecting pipe 31 in the X direction and the Y direction (horizontal direction).
Further, in this step, the support spacer 35 provided on the inner peripheral surface 31b of the connection pipe 31 can stably support the steel pipe support column 20 on the connection pipe 31, and the end portion of the steel pipe pile 10 on the one end side thereof. A filling portion g ₃ communicating with the filling portions g ₁ and g ₂ can be held between 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 g ₁ between the outer peripheral surface 10 a of the steel pipe pile 10 and the inner peripheral surface 31 b of the connecting pipe 31, the outer peripheral surface 20 a of the steel pipe support 20, and the connecting pipe 31. filling portion g ₂ between the inner peripheral surface _31b, and before curing over each of the filling portion g ₃ between the one end side of the end portion 20x of the one end side of the end portion 10x and the steel pipe column 20 of the steel pipe pile 10 The filling material 37 is filled. The filling material 37 is injected into the filling portion g ₁ from the other end 31y side of the connecting pipe 31. Then, the filling material 37 injected into the filling portion g ₁ flows due to its own weight over the filling portion g ₂ and the filling portion g ₃ , and each of the filling portions g ₁ , g ₂ and g ₃ is filled with the filling material 37. To be done. Concrete, for example, is used as the filler 37.
In this step, since the earth and sand 3 are previously packed in the steel pipe pile 10 as a filling material, the earth and sand 3 can prevent the filler 37 from entering the inside of the steel pipe pile 10. In this Embodiment 1, since the earth and sand 3 are packed to a position one step lower than the end 10x on one end side of the steel pipe pile 10, the filling material 37 is inside the steel pipe pile 10 and the end on one end side of the steel pipe pile 10. From the portion 10x to the soil 3 is filled, but further infiltration is suppressed.
In addition, in this process, since the lid 22 that closes the inside of the steel pipe strut 20 is installed in advance on one end side of the steel pipe strut 20, the filler 22 allows the filler 37 to enter the inside of the steel pipe strut 20. Can be suppressed.
The filling in this step, since one end of the steel pipe column 20 is supported by a supporting spacer 35 for holding the filling part g _3, the filler 37 to each of the filling portion g _1, g _2, g ₃ in one can do.

Next, the filler 37 is hardened. Thereby, the connecting portion 30 that connects the steel pipe pile 20 installed in the ground 2 to the steel pipe pile 20 in a standing state is formed, and the steel pipe pile 20 is connected to the steel pipe pile 10 via the connecting portion 30. The pile connection column structure 1 is almost completed.

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

<<Effect of Embodiment 1>>
Next, main effects of the first embodiment will be described.
In the pile connection strut structure 1 of the first embodiment, one end side of the steel pipe post 20 is connected to one end side of the steel pipe pile 10 installed in the ground 2 via the connecting portion 30. And the connection part 30 has a structure which inserts one end side of each of the steel pipe pile 10 and the steel pipe support|pillar 20 in the inside of the connection pipe 31, and connects the steel pipe pile 10 and the steel pipe support|pillar 20. The connecting portion 30 can connect the steel pipe pile 10 and the steel pipe strut 20 without inserting the steel pipe strut 20 inside the steel pipe pile 10, and therefore, as in the connecting portion of Patent Document 1, the steel pipe pile is formed. It is not necessary to use the steel pipe pile 10 whose outer diameter is larger than the outer diameter of the steel pipe strut 20 in order to connect the steel pipe strut 20 to 10, and the steel pipe pile 10 and the steel pipe strut 20 of the same outer diameter can be connected. ..
The connecting portion 30 is a filling portion for filling the filling material 37. The filling portion g _{1 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, and the inner periphery of the steel pipe strut 20. A filling portion g ₂ between the surface 20b and the outer peripheral surface 31a of the connecting pipe 31, and a 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 one end side of the steel pipe support 20. Each has a structure. In this connecting part 30, the width of the filling parts g ₁ and g ₂ can be easily widened by increasing the outer diameter of the connecting pipe 31, and the length of the connecting pipe 31 in the longitudinal direction can be lengthened. in so the width of the filling portion g ₃ can be easily widely, as in the connecting portion of Patent Document 1, a large steel pipe piles 10 than dare the outer diameter of the outer diameter of the steel pipe column 20 according to the width of the filling portion Need not be used. In particular, the connecting portion 30 is formed of the filling portions g ₁ , g ₂ , g ₃ so that the filling material 37 can be smoothly filled without increasing the outer diameter of the steel pipe pile 10 to be larger than the outer diameter of the steel pipe strut 20. The width can be easily widened.
In addition, in this connecting portion 30, it is not necessary to intentionally use the steel pipe pile 10 having an outer diameter larger than the outer diameter of the steel pipe strut 20 for connecting the steel pipe pile 10 and the steel pipe strut 20. There is no need to increase the diameter of the excavation hole for installation inside 2.
Therefore, according to the pile connection strut structure 1 of this Embodiment 1, it is not necessary to select the steel pipe pile 10 having an outer diameter larger than the outer diameter of the steel pipe strut 20 in order to connect the steel pipe strut 20 to the steel pipe pile 10. In addition, since it is not necessary to increase the diameter of the excavation 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 unlike 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 parts. 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) including the pile connecting strut structure 1 can be reduced.

In addition, 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 provided. In comparison with the above, since the vertical load acting on the upper end of the steel pipe pile 10 and the lower end of the steel pipe strut 20 can be evenly distributed and transmitted, the bending moment of the pile connection strut structure 1 and the stress against the vertical force. The strength can be increased.

Moreover, in the connection part 30 of this Embodiment 1, the pile insertion length L1 which inserts the one end side of the steel pipe pile 10 into the inside of the connection pipe 31 from the one end 31x of the connection pipe 31 is set to the outer diameter Dp of the steel pipe pile 10. 1.5 times or more, and the column insertion length L2 for inserting one end side of the steel pipe column 20 into the inside of the connection pipe 31 from the other end 31y of the connection pipe 31 is 1. By setting the ratio to 5 times or more, the connecting portion 30 having high strength against bending moment can be constructed.

According to the construction method of the pile connection strut structure 1 of this Embodiment 1, one end side of each of the steel pipe pile 10 and the steel pipe strut 20 is inserted into the inside of the connection pipe 31, and then the outer peripheral surface 10a of the steel pipe pile 10 and the connection pipe. filling unit _{g 2,} and, at one end of the steel pipe pile 10 end between the filling unit _{g 1,} and the outer peripheral surface 20a of the steel pipe column 20 and the inner peripheral surface 31b of the connecting pipe 31 between the inner peripheral surface 31b of the 31 The filling material 37 is filled over each of the filling portions g ₃ between the portion 10x and the end portion 20x on the one end side of the steel pipe support 20, and then the filling material 37 is cured. Therefore, it is not necessary to select the steel pipe pile 10 having the inner diameter and the outer diameter larger than the outer diameter of the steel pipe strut 20 in order to connect the steel pipe strut 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 excavation hole, the material cost and construction of the steel pipe pile 10 as compared with the conventional connection portion in which the steel pipe support is inserted inside the steel pipe pile 10 like the connection portion of Patent Document 1. Cost can be reduced. Thereby, the pile connection pillar structure 1 can be constructed at low cost.

Moreover, the construction method of the pile connection support structure 1 of this Embodiment 1 connects one end side of the steel pipe support|pillar 20 to one end side of the steel pipe pile 10 through the connection pipe 31 installed on the leveling concrete layer 5. Therefore, even when the projecting height at which one end side of the steel pipe pile 10 projects from the ground 2 is different due to an installation error (placement error) when the steel pipe pile 10 is installed in the ground 2, leveling concrete By leveling the height position from the layer 5 to the support spacer 35 of the connecting pipe 31 to a predetermined height position and adjusting the position in the height direction of the concrete layer 5, the steel pipe support column 20 is moved to a predetermined height. Can be installed in

In addition, in this Embodiment 1, the case where the lid 22 is installed on one end side of the steel pipe strut 20 so as to close the inside of the steel pipe strut 20 has been described, but the lid 22 is not necessarily required 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 can be small.

On the other hand, in the case of the steel pipe pile 10, since the filler 37 in an amount substantially equivalent to the entire length of the steel pipe pile 10 penetrates into the steel pipe pile 10, the inside of the steel pipe pile 10 as in the first embodiment. It is necessary to install a packing material such as earth and sand 3 in the above, or to install the lid 38 at the end 10x on one end side of the steel pipe pile 10 as described in the third embodiment.

≪Practical example≫
Next, the effects of the first embodiment will be described with reference to specific examples, but the present invention is not limited to these examples.
Generally, in the connecting portion of Patent Document 1, the width of the filling portion is 150 [mm] so that the filling material between the steel pipe pile and the steel pipe support inserted inside the steel pipe pile can be reliably filled with the filling material. ] It is necessary to be more than. Further, also in the connecting portion 30 of the first embodiment, the filling material 37 can be reliably filled in the filling portion g ₁ between the connecting pipe 31 and the steel pipe support 20 inserted into the connecting pipe 31. The width of the filling portion g ₁ needs to be 150 [mm] or more. As a result, the outer diameter of the steel pipe pile needs to be larger than the outer diameter of the steel pipe strut by about 200 [mm] in the connecting portion of Patent Document 1, and the connecting portion 30 of the first embodiment also has It is necessary to make the outer diameter larger than the outer diameter of the steel pipe pile 10 by about 200 [mm].

On the other hand, in the design standards for steel pipe piles, the following regulations are provided when the outer diameter of the steel pipe pile is D and the plate thickness (wall thickness) is t.
(#1) Safety against local buckling of steel pipe piles: D/t≦100
(#2) Minimum thickness of steel pipe pile: t≧9 mm
Due to these regulations, a steel pipe pile having a plate thickness thicker than a required plate thickness determined by the stress of the steel pipe pile may be used. Therefore, in the following cases, it is possible to reduce the weight of the steel pipe pile, reduce the cost of the steel pipe pile, and reduce the construction cost of the steel pipe pile by connecting the steel pipe pillar and the steel pipe pile with the same outer diameter. it can.
(I) In the case where the outer diameter of the steel pipe support is 700 mm or less and the outer diameter of the steel pipe pile is 900 mm or less at the connecting part of Patent Document 1, the connecting part of Patent Document 1 and the connecting part 30 of Embodiment 1 are In any 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 the 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 support 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). In general, the plate thicknesses of steel pipes that are easily procured are 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) regulation. The weight of 30 can reduce the weight of the steel pipe pile 10. When the outer diameter of the steel pipe pile is further increased, the minimum value of the plate thickness is often determined by the above-mentioned (#1) rule, and the outer diameter of the steel pipe pile is smaller than that of the connecting portion 30 of the first embodiment. However, the plate thickness of the steel pipe pile 10 can be made thinner than that of the connection portion of Patent Document 1, and the connection portion 30 of the first embodiment can reduce the weight of the steel pipe pile 10 in many cases.

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

[Embodiment 2]
≪Pile connection pillar 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 is different in the following configuration.

That is, as shown in FIG. 12, the pile connection strut structure 1A of this Embodiment 2 is equipped with the concrete pile 15 instead of the steel pipe pile 10 of Embodiment 1 described above. Other configurations are similar to those of the first embodiment.
The concrete pile 15 is mainly composed of a circular concrete pipe having a circular outer peripheral surface 15a and an inner peripheral surface 15b which penetrates along the longitudinal direction and is orthogonal to the longitudinal direction. The concrete pile 15 has, for example, a prestressed concrete structure in which a compressive force is applied in advance by a steel material or a reinforcing bar embedded in a concrete layer. The concrete pile having such a structure is commonly called a PC pile. This PC pile has a larger resistance to bending moment than a normal concrete pile having no prestress.

The inside (through hole) of the concrete pile 15 is filled with the earth and sand 3 as a filling material as in the case of the steel pipe pile 10 of the above-described first embodiment. The earth and sand 3 are packed to a position lower than the end 15x on one end side of the concrete pile 15, for example, to the same level as the surface layer 2a of the ground 2. Then, the inside of the one end side of the concrete pile 15 is filled with the filler 37 from the one end side end 15x 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 31x of the connecting pipe 31, and one end side of the steel pipe column 20 is inserted from the other end 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. A filling part g ₁ is provided so as to surround the same. 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 is provided. A filling part g ₂ is provided so as to surround the. Further, one end side of the end portion 15x of the concrete pile 15, between the one end side of the end portion 20x of the steel pipe column 20, is provided filling portion g ₃ in communication with each of the filling portion g ₁ and g ₂ There is. Then, each of the filling portions g ₁ , g ₂ and g ₃ is integrally filled with the filling material 37 as in the first embodiment.

The concrete pile 15 has 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 that are larger than the outer diameters of the concrete pile 15 and the steel pipe column 20, respectively, so that the filling portions g ₁ and g ₂ are formed between the concrete pipe 15 and the steel pipe column 20, respectively. It is formed with a diameter.

Here, the concrete pile 15 has a larger plate thickness (wall thickness) than the steel pipe pile 10 of Embodiment 1 described above, and has a smaller inner diameter than a steel pipe pile having the same outer diameter. For this reason, it is difficult to use the concrete pile because it is necessary to select a concrete pile having a larger outer diameter in accordance with the outer diameter of the column in the connecting portion of Patent Document 1.

On the other hand, in the connecting portion 30 of the second embodiment, the concrete pile 15 having an outer diameter larger than the outer diameter of the steel pipe support 20 for connecting the steel pipe support 20 to the concrete pile 15 is provided in the same manner as in the first embodiment. Since it is not necessary to select, it is possible to use the concrete pile 15 having a thicker plate thickness than the steel pipe pile 10.

Therefore, according to the pile connection strut structure 1A of the second embodiment, the same effect as that of the above-described first embodiment can be obtained, and the concrete pile 15 can be used.

[Embodiment 3]
≪Pile connection pillar 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 is different in the following configurations.

That is, in the pile connection column structure 1B of this Embodiment 3, as shown in FIG. 13, the lid 38 is installed at the end 10x on one end side of the steel pipe pile 10 so as to close the inside of the steel pipe pile 10. ing. Other configurations are the same as those of the pile connection strut structure 1 of the first embodiment described above.
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 part g ₃ of the third embodiment is the same as the cover 38 provided on the end 10x on one end side of the steel pipe pile 10 and the cover 20 provided on the end 20x on one end side of the steel pipe column 20. 22 and 22.

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

First, the same steps as in Embodiment 1 are performed to install the steel pipe pile 10 in the ground 2 and to form the recess 4 and the leveling concrete layer 5 as shown in FIG. 14( a ). In the first embodiment, the earth and sand 3 are packed in the steel pipe pile 10 as a packing material, but in the third embodiment, the earth and sand 3 are 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 one end side of the steel pipe pile 10 is sealed by a lid 38.

Next, similarly to Embodiment 1 described above, one end side of the steel pipe pile 10 installed in the ground 2 is inserted into the inside of the connection pipe 31 from one end 31x in the longitudinal direction of the connection pipe 31, and as shown in FIG. As shown in b), the connecting pipe 31 is installed on the leveling concrete layer 5 provided at the bottom of the recess 4 of the ground 2.
In this step, similarly to Embodiment 1 described above, 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 for piles and the second built-in spacer 33b provided inside the connecting pipe 31. The filling portion g ₁ can be held between the inner peripheral surface 31 b of the steel pipe pile 10 and the inner peripheral surface 31 b of the steel pipe pile 10 in the circumferential direction Cd of the steel pipe pile 10 in the X direction and the Y pipe direction. Positioning can be performed. In addition, the relative level of the steel pipe pile 10 and the connecting pipe 31 in the height direction (Z direction) can be determined by the installation reference plane of the leveling concrete layer 5. Moreover, since the pile first built-in spacer 33a and the pile second built-in spacer 33b are separated in the longitudinal direction of the connecting pipe 31, the pile first built-in spacer 33a and the pile second built-in spacer 33a. By the spacer 33b, the central axis in the longitudinal direction of the connecting pipe 31 can be easily aligned with the central axis in the longitudinal direction of the steel pipe pile 10.

Next, as in the case of the above-described first embodiment, one end of the steel pipe support column 20 from the other end 31y of the connection pipe 31 installed on the leveling concrete layer 5 to the inside of the connection pipe 31 until the support spacer 35 is abutted. And the steel pipe support 20 is installed on the steel pipe pile 10 as shown in FIG. A lid 22 is installed in advance on one end side of the steel pipe strut 20 so as to close the inside of the steel pipe strut 20, as in the first embodiment.
In this step, similarly to the first embodiment described above, the first built-in spacer 34 for the pillar provided on the inner peripheral surface 31b of the connecting pipe 31, and the second pillar for the pillar provided on the outer peripheral surface 20a of the steel pipe pillar 20. With the built-in spacer 23, the filling portion g ₂ 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 in the circumferential direction Cd of the connecting pipe 31. It is possible to perform relative positioning between the steel pipe column 20 and the connecting pipe 31 in the X direction and the Y direction (horizontal direction). In addition, the support spacer 35 provided on the inner peripheral surface 31b of the connecting pipe 31 can stably support the steel pipe support column 20 on the connecting pipe 31, and the end portion 10x on one end side of the steel pipe pile 10 and the steel pipe support column. A filling part g ₃ communicating with the filling parts g ₁ and g ₂ can be held between the end part 20 x on the one end side of 20.

Next, as shown in FIG. 15( b ), the filling part g ₁ between the outer peripheral surface 10 a of the steel pipe pile 10 and the inner peripheral surface 31 b of the connecting pipe 31, the outer peripheral surface 20 a of the steel pipe support 20, and the connecting pipe 31. filling before curing over the filling portion g ₃ between the one end side of the end portion 20x of the filling portion g _2, and one end side of the end portion 10x and the steel pipe column 20 of the steel pipe pile 10 between the inner peripheral surface 31b The material 37 is filled. The filling material 37 is injected into the filling portion g ₁ from the other end 31y side of the connecting pipe 31. Then, the filling material 37 injected into the filling portion g ₁ flows due to its own weight over the filling portion g ₂ and the filling portion g ₃ , and each of the filling portions g ₁ , g ₂ and g ₃ is filled with the filling material 37. To be done. Concrete, for example, is used as the filler 37.
In this step, since the lid 38 that closes 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 allows the filler 37 to enter the inside of the steel pipe pile 10. Can be suppressed.
Further, in this step, similarly to the above-described first embodiment, since the lid 22 that closes the inside of the steel pipe strut 20 is provided in advance on one end side of the steel pipe strut 20, the filler 22 is used by the lid 22. It is possible to prevent 37 from entering the inside of the steel pipe column 20. Further, since one end side of the steel pipe support 20 is supported by the support spacer 35 holding the filling portion g ₃ , it is possible to fill the filling material 37 into each of the filling portions g ₁ , g ₂ , g ₃ at once. it can.

Next, the filler 37 is hardened. As a result, a connecting portion 30 for standing and connecting the steel pipe support column 20 to the steel pipe pile 10 installed in the ground 2 is formed, and at the same time, the steel pipe support column 20 is connected to the steel pipe pile 10 via the connecting part 30. The pile connection column structure 1B is almost completed.

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

In the third embodiment, the lid 38 is installed before the connecting pipe 31 is installed. However, the lid 38 may be installed before the filling material 37 is filled. It is not limited to 3. That is, the step of installing the lid 38 is preferably performed before the step of filling the filling material 37, but more preferably from the viewpoint of workability, before the step of installing the connecting pipe 31.

<<Effect of Embodiment 3>>
According to the pile connection pillar structure 1B and the construction method thereof of the third embodiment, the same effect as that of the above-described first embodiment can be obtained.
Further, according to the construction method of the pile connection column structure 1B of the third embodiment, the lid body 38 that closes the inside of the steel pipe pile 10 is installed on one end side of the steel pipe pile 10 before the filling material 37 is filled. Therefore, the filler 37 can be prevented from entering the inside of the steel pipe pile 10.
Therefore, it is possible to omit the step and cost of charging the stuffed soil inside the steel pipe pile in the case of the first embodiment. Therefore, especially in the case of a steel pipe pile having a deep installation depth in the ground, the process and construction costs can be reduced.
In addition, also in the pile connection pillar structure 1B of this Embodiment 3, the concrete pile 15 can be used instead of the steel pipe pile 10 like the pile connection pillar structure 1A of Embodiment 2 mentioned above.

[Embodiment 4]
≪Pile connection pillar 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 is different in the following configuration.

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

The one end side of the steel pipe pile 10 is inserted inside from the one end part 41x in the longitudinal direction (Z direction) of the connecting part 40, and the other end part 41y opposite to the one end part 41x in the longitudinal direction is inserted into the inside of the steel pipe strut 20. It is provided with a connecting pipe 41 having one end inserted. In addition, 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 strut 20 and the connecting pipe 41, and between the steel pipe pile 10 and the steel pipe strut 20. It is provided with 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, which penetrates in the longitudinal direction (X direction) and is orthogonal to the longitudinal direction. The connecting pipe 41 is installed on the leveling concrete layer 5 such that the one end 41x is in contact with the upper surface of the leveling concrete layer 5, as in the above-described first embodiment. The positioning is 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 connecting pipe 41 from one end portion 41x of the connecting pipe 41, the steel pipe pile 10 is filling unit g ₄ so as to surround the outer circumferential surface 10a. Further, between the inner peripheral surface 41b of the connecting pipe 41 and the outer peripheral surface 20a of the steel pipe strut 20 inserted into the connecting pipe 41 from the other end 41y of the connecting pipe 41, the outer peripheral surface of the steel pipe strut 20 is provided. A filling part 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 one end side of the steel pipe pile 10 and the end portion 20x on one end side of the steel pipe strut 20. There is. Then, each of the filling parts g ₄ , g ₅ and g ₆ is integrally filled with the filling material 47 as in the first embodiment.

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

Each of the filling parts 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 strut 20 and the connecting pipe 31, and the steel pipe pile 10). And the steel pipe support 20), and is a space region before the filling material 47 is filled, but becomes a filling region after the filling material 47 is filled.

Further, the filling portion g ₆ also has a lid body 38 provided at one end side end portion 10x of the steel pipe pile 10 and a lid body provided at one end side end portion 20x of the steel pipe strut 20 as in the third embodiment. 22 and 22.

The connecting pipe 41 of this Embodiment 4 is provided with the first built-in spacers 34 for the pillars similarly to the connecting pipe 31 of the above-mentioned Embodiment 1, but unlike the connecting pipe 31 of the above-mentioned Embodiment 1, the pile. The first and second built-in spacers 33a and 33b and the support spacer 35 are not provided. The connecting pipe 41 according to the fourth embodiment includes the 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 protrude inward from the inner peripheral surface 41b near the one end portion 41x side of the connecting pipe 41, and It is continuously stretched in the direction Cd.

The inner peripheral rib 43 is filled with the 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 connection pipe 41 from the one end 41x of the connection pipe 41. Thus, it is separated from the outer peripheral surface 10a of the steel pipe pile 10.

≪Construction method of pile connection pillar structure≫
Next, a method for constructing the pile connection column structure 1C of the fourth embodiment will be described with reference to FIGS. 17, 18 and 19.

First, the same steps as those of the above-described first embodiment are performed to install the steel pipe pile 10 in the ground 2, form the recesses 4, and the leveling concrete layer 5 as shown in FIG. 17( a ). Also in the fourth embodiment, similarly to the third embodiment, the filling of the earth and sand 3 into the steel pipe pile 10 is not performed.

Next, as in the above-described third embodiment, as shown in FIG. 17A, the inside of the steel pipe pile 10 is closed at the end 10x on one end side of the steel pipe pile 10 installed in the ground 2. The lid 38 is installed. The inside of one end side of the steel pipe pile 10 is sealed by a 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 one end 41x in the longitudinal direction of the connecting pipe 41, as shown in FIG. As shown in b), the connecting pipe 41 is installed on the leveling concrete layer 5 provided at the bottom of the recess 2b of the ground 2. The connection pipe 41 is installed so as to hold the filling portion g ₁ between the outer peripheral surface 10a of the steel pipe pile 10 and the inner peripheral surface 41b of the connection pipe 41 in the circumferential direction Cd of the connection pipe 41.
In this process, the position in the X direction and the Y direction (horizontal direction Hd) of the steel pipe pile 10 is deviated from the predetermined position due to an installation error (placement error) when installing the steel pipe pile 10 in the ground 2. There is a case. Even in such a case, the connection pipe 31 can be installed at a predetermined horizontal position by adjusting the horizontal installation position of the connection pipe 41 with respect to the installation position of the steel pipe pile 10. However, the horizontal installation position of the connecting pipe 41 is adjusted within a range in which the filling portion g ₄ is held over the circumferential direction Cd of the connecting pipe 31.
Further, in this step, similarly to the above-described first embodiment, the relative height direction (Z direction) of the steel pipe pile 10 and the connecting pipe 31 is determined by the installation reference plane of the leveling concrete layer 5. You can

Next, as shown in FIG. 18( a ), with the lid 38 installed on the end 10 x on one end side of the steel pipe pile 10 and the connection pipe 41 installed on the leveling concrete layer 5, as shown in FIG. over the upper filling portion g ₄ and the cover 38 between the inner peripheral surface 41b of the connecting pipe 41 and the outer peripheral surface 10a of the pile 10 to fill the first filler 47a before curing. The first filling material 47a is injected inside from the other end portion 41y side of the connecting pipe 41. The first filler 47a which is injected into the connecting pipe 41 flows over the top of the filling portion g ₄ and the cover 38 by its own weight, the upper filling portion g ₄ and the cover 38 is first filler It is filled with 47a. Concrete, for example, is used as the first filling material 47a.

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

Next, the first filling material 47a is cured. The hardened 1st filler 47a is the steel pipe support|pillar 20 when inserting the one end side of the longitudinal direction of the steel pipe support|pillar 20 in the inside of the connection pipe 41 from the other end part 41y of the connection pipe 41 in a support|pillar insertion process after this. as filling section g ₅ is formed between the steel pipe pile 10, functions as a support portion for supporting and spacing the ends 20x at one end of the steel pipe column 20 from the end 10x of the one end of the steel pipe pile 10 Have. That is, until the lid 38 is filled portion _{g 6} from the surface of the first filler 47a.

Next, the one end side of the steel pipe support 20 is inserted from the other end 41y of the connecting pipe 41 installed on the leveling concrete layer 5 into the inside of the connecting pipe 41 until it abuts against the first filling material 37a. As shown in (b), the steel pipe column 20 is installed on the first filling material 47a.

In this step, the first filling material 47a filled in the inside of the connecting pipe 41 allows the connecting pipe 41 to stably support the steel pipe support 20, and 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 the one end side of the column 20.
Further, in this step, as in the above-described first embodiment, the first built-in spacer 34 for the support provided on the inner peripheral surface 41b of the connecting pipe 41 and the support for the support provided on the outer peripheral surface 20a of the steel pipe support 20. By the second built-in spacer 23, a filling portion g that communicates with the first filling material 47a in 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. ₅ can be held, and the relative positioning of the steel pipe column 20 and the connecting pipe 41 in the X direction and the Y direction (horizontal direction) can be performed. Further, the first filling material 47a already filled in the inside of the connecting pipe 41 allows the connecting pipe 41 to stably support the steel pipe strut 20, and the end portion 10x on one end side of the steel pipe pile 10 and the steel pipe strut. A filling portion g ₆ communicating with the filling portions g ₄ and g ₅ can be held between the end portion 20x on the one end side of 20.

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

Next, the second filling material 47b is cured. Thereby, each of the filling parts g ₄ , g ₅ and g ₆ is filled with the filling material 47 including the first filling material 47a and the second filling material 47b. Further, a connecting portion 40 that connects the steel pipe pile 20 installed in the ground 2 in a state where the steel pipe pillar 20 is erected is formed, and a pile that connects the steel pipe pillar 20 to the steel pipe pile 10 via the connecting portion 30. The connection strut structure 1C is almost completed.

After this, by forming the root-wound concrete layer 6 on the leveling 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 connection column structure 1C and the construction method thereof of the fourth embodiment, the same effect as that of the above-described first embodiment can be obtained.
Moreover, according to the construction method of the pile connection strut structure 1C of this Embodiment 4, due to an installation error (placement error) when installing the steel pipe pile 10 in the ground 2, the X direction of the steel pipe pile 10 and Even when the position in the Y direction (horizontal direction) deviates from the predetermined position, the horizontal position of the connecting pipe 41 is adjusted by adjusting the horizontal installing position of the connecting pipe 41 with respect to the installing position of the steel pipe pile 10. It can be installed in place.
It should be noted that the step of installing the lid body 38 is preferably performed before the step of filling the filling material 47a, but is more preferably performed before the step of installing the connecting pipe 41 from the viewpoint of workability.

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

The construction method of the pile connection strut structure 1D of the fifth embodiment is almost the same as the construction method of the pile connection strut structure 1C of the fourth embodiment described above, but FIGS. 21(a), (b), (c). ), before the step of filling the first filling material 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)). ) Is provided. It is preferable that the filling step of the earth and sand 3 is performed before the filling step of the filler 47a, but it is more preferable that the filling step is performed before the step of installing the connecting pipe 41 (FIG. 21B) from the viewpoint of workability. ..
According to the pile connection column structure 1D and the construction method thereof of the fifth embodiment, the same effect as that of the fourth embodiment can be obtained.

In addition, although the connecting pipe 41 of Embodiments 4 and 5 described above includes the built-in spacer for columns, it does not have the built-in spacer for piles. Therefore, it is preferable that at least the pillar built-in spacer of the pile built-in spacer and the pillar built-in spacer is provided as the connecting pipe for connecting the pillar to the pile.

[Modification of Embodiment]
Next, a modified example of the embodiment will be described.
«Modification 1»
As shown in FIG. 12, the connecting portion 30 of the second embodiment described above includes the support spacer 35 joined to the inner peripheral surface 31b of the connecting pipe 31. In addition, the steel pipe column 20 of the second embodiment described above includes the second column spacer 23 on the outer peripheral surface 20a.
On the other hand, as shown in FIGS. 22( a) and 22 (b ), the connecting portion 50 a of Modification 1 includes a spacer spacer 51 instead of the support spacer 35. In addition, the connecting portion 50a according to the first modification includes a second supporting spacer 52 for a pillar in place of the second mounting spacer 23 for a supporting pillar. Other configurations are similar to those of the second embodiment.

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

The second pillar spacer 52 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 with the first support spacer for pillar 34, four second support spacers for pillar 52 are arranged at equal intervals in the circumferential direction Cd of the connecting pipe 31, for example. In addition, the second built-in spacer 52 for the support column is made 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.

The second column spacer 52 for the support column, together with the first spacer spacer 34 for the column, of the steel pipe column 20 when the one end side of the steel pipe column 20 is inserted from the other end 31y of the connection pipe 31 into the inside of the coupling pipe 31. The filling part g ₂ is held between the outer peripheral surface 20 a and the inner peripheral surface 31 b of the connecting pipe 31.

Also in this modification 1, the same effect as that of the above-described second embodiment can be obtained. And this modification 1 can be applied also to above-mentioned Embodiment 1, 3-5.
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 level of the surface of the concrete layer 5. Instead, it can be adjusted by the height of the spacer spacer 51. Therefore, it is effective when the ground 2 is soft and the leveling concrete layer 5 is easily deformed, and when it is unstable and it is difficult to adjust the height by the leveling concrete layer 5. In addition, since the second built-in spacer 52 for the support column is not mounted so as to project on the outer peripheral surface of the steel pipe support column 20, the transportation, storage, and installation of the steel pipe support column 20 will not occur in the steel pipe support column 20 as compared with the case of the second embodiment. Since it is not necessary to consider the protrusions on the outer peripheral surface 20a, workability can be improved.

«Modification 2»
As shown in FIG. 22, in the above-described modified example 1, the steel pipe column 20 having the same outer diameter as that of the concrete pile 15 is used.
On the other hand, as shown in FIGS. 23A and 23B, in the second modification, the steel pipe column 25 having an outer diameter smaller than that of the concrete pile 15 is used. In the second modification, the strut first built-in spacers 34 and the strut second built-in spacers 52 have an amount of protrusion that is an inward protrusion from the inner peripheral surface 31 b of the connecting pipe 31 to the outer diameter of the steel pipe strut 25. Accordingly, the number is larger than that in the first modification. Similar to the steel pipe support 20, the steel pipe support 25 is mainly configured by a circular steel pipe having an 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 as well, the same effects as those of the above-described 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. And this modification 2 is also applicable to above-mentioned Embodiments 1-5.
Further, according to this modified example 2, since the outer diameter of the pillar can be different from the outer diameter of the pile, it is possible to improve the degree of freedom in selecting the outer diameter of the pillar suitable for the design conditions, and to improve the economical efficiency and safety. Improved design is possible.

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

In both of the modified examples 3 and 4, the same effect as that of the modified example 2 can be obtained. Then, any of the modified examples 3 and 4 can be applied to the above-described first to fifth embodiments.
Further, according to the modified examples 3 and 4, the present invention can be applied to the case where the pillar of the building such as the office, the warehouse, the store is the rectangular steel pipe or the H-shaped steel, and the wide range of applications and structures can be applied. The effect of reducing construction cost and construction period can be obtained for building structures and civil engineering structures.

«Modification 5»
As shown in FIG. 23, the connecting portion 50a of Modification Example 2 described above includes the first built-in spacer 34 for columns, the second built-in spacer 52 for columns, and the second built-in spacer 52 for columns that 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 the first and second built-in spacers 34 and 52 for the columns and the first and second built-ups for the piles. Each of the embedded spacers 33 a and 33 b includes a spacer structure 55 provided on the base member 56. The base member 56 extends inside the connecting pipe 31 from one end 31x side of the connecting pipe 31 to the other end 31y side, and the end located on the other end 31y side of the connecting pipe 31 is the other end 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 connection pipes 31 are arranged at equal intervals in the circumferential direction Cd.

Also in this modified example 5, the same effect as in the modified example 2 described above can be obtained. And this modification 5 is also applicable to above-mentioned Embodiments 1-5.
Moreover, 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. This eliminates the need for processing pipes and reduces manufacturing costs.
The spacer structures 55 adjacent to each other may be connected by a connecting member to construct a multiple structure.

Although the present invention has been specifically described based on the above embodiment, the above example, and the above modification, the present invention is not limited to the above embodiment, the above example, and the above modification, and its gist is not limited. Of course, various changes can be made without departing from the scope.

For example, the present invention relates to a pile connection pillar structure used for installation of lighting fixtures, signs, railway overhead lines, etc., a pile connection pillar structure for bridge piers, steel towers, etc., and a pile connection pillar used for building buildings, roads, etc. It can be applied to a strut structure and a pile connection strut structure that supports the roof.

1, 1A, 1B, 1C, 1D... Pile connection pillar structure 2... Ground 2a... Surface layer 2b... Excavation hole 3... Sediment (stuffing material)
4... Recessed part 5... Leveling concrete layer 6... Nemaki 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 support 20a... Outer peripheral surface 20b... Inner peripheral surface 20x... End 22... Lid 23... Second support spacer 25, 26, 27... Steel pipe support 30... Connecting portion 31... Connecting pipe 31a... Outer peripheral surface 31b ... Inner peripheral surface 33a... First built-in spacer for piles 33b... Second built-in spacer for piles 34... First built-in spacer for columns 35... Support spacer 37... Filler 38... Lid 40... Connection part 41... Connection Tube 41a... Outer peripheral surface 41b... Inner peripheral surface 43... Inner peripheral rib 47... Filler 47a... First filler 47b... Second filler 50a, 50b... Connecting portion 51... Spacer spacer 51a... First support plate 51b. 2nd support plate 52... 2nd built-in spacer for pillars 55... Spacer structure 56... Base member 61... Ball-proof net 62a, 62b, 62c... Split pillar

Claims (18)

A pile installed in the ground, and a pillar having one end side connected to one end side of the pile via a connecting portion,
The connecting portion, one end side of the pile is inserted into the inside from one end portion in the longitudinal direction, and a connecting pipe in which one end side of the pillar is inserted from the other end portion opposite to the one end portion in the longitudinal direction,
In the connection pipe, between the pile and the pillar and the connection pipe, and a filler filled between the pile and the pillar,
A pile connecting strut structure characterized by comprising: The pile insertion length in 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 connection pillar structure according to claim 1, wherein a pillar insertion length in which one end side of the pillar is inserted into the connection pipe is 1.5 times or more of an outer diameter of the pillar. The pile connection column structure according to claim 2, wherein the filler is concrete or mortar having a compression standard strength of 18 N/mm ² or more. The connecting pipe holds a built-in spacer for a pile 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 column. The pile connection pillar structure according to any one of claims 1 to 3, further comprising at least a pillar built-in spacer among the pillar built-in spacers. 5. The connection pipe is provided with a support spacer that supports the pillar and holds a filling portion of the filling material between the pillar and the stake. Pile connection pillar structure described in. The connecting portion is arranged between the pile and the pillar separately from the connecting pipe, and while supporting the pillar and holding the filling portion of the filling material between the pile and the pillar. The pile connection pillar structure according to any one of claims 1 to 4, further comprising a seat spacer. The connecting portion holds a built-in spacer for a pile 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 column. 7. A spacer structure having at least a pillar built-in spacer among the pillar built-in spacers, and further comprising a spacer structure which is separated from the connection tube and arranged inside the connection tube. 6. The pile connection column structure according to item 6. The pile is formed in a tubular shape,
The pile connection pillar structure according to any one of claims 1 to 7, wherein a lid is installed on one end side in the longitudinal direction of the pile so as to close the inside of the pile. body. The pile connection pillar structure according to any one of claims 1 to 8, wherein the pile is a tubular concrete pile. A step of inserting the one end side of the pile installed in the ground into the inside of the connecting pipe from one end in the longitudinal direction of the connecting pipe to install the connecting pipe on the ground;
A step of inserting one end side of a support into the inside of the connection pipe from the other end opposite to one end in the longitudinal direction of the connection pipe installed on the ground and installing the support on the pile; ,
Filling a filler between the pile and the pillar and the connection pipe, and between the pile and the pillar, and curing the filler,
A method for constructing a pile connection strut structure, comprising: The pile insertion length for inserting one end side of the pile into the inside of the connecting pipe is 1.5 times or more the outer diameter of the pile,
The column insertion length for inserting one end side of the column into the inside of the connecting pipe is 1.5 times or more of the outer diameter of the connecting pipe,
The method for constructing a pile connection pillar structure according to claim 10, wherein the filler is concrete or mortar having a compression standard strength of 18 N/mm ² or more. Before the step of installing the connecting pipe on the ground, further comprising the step of forming a leveling concrete layer on the ground so as to surround the pile,
The said connection pipe is installed on the said leveling concrete layer, The construction method of the pile connection support structure of Claim 10 or 11 characterized by the above-mentioned. The pile is formed in a tubular shape,
13. The method according to claim 10, further comprising a step of packing a packing material inside the pile installed in the ground before the step of filling the packing material. Construction method of pile connected pillar structure. The pile is formed in a tubular shape,
Prior to the step of filling the filling material, the method further comprises a step of installing a lid on one end side of the pile installed in the ground so as to close the inside of the pile. Item 13. A method for constructing a pile connection support structure according to any one of items 10 to 12. The connection pipe includes a support spacer that supports the column,
15. The step of installing the pillar comprises inserting the pillar into the connecting pipe until an end portion of the pillar on one end side abuts on the support spacer. Construction method of pile connected pillar structure. The connecting pipe holds a built-in spacer for a pile 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 column. At least a built-in spacer for a pillar is provided among the built-in spacers for a pillar, and the method for constructing a pile connection pillar structure according to any one of claims 10 to 15, wherein: Installing one end side of the pile installed in the ground into the connecting pipe from one end side of the connecting pipe to install the connecting pipe on the ground;
Filling the first filler between the connecting pipe and the pile, and over the end portion on the one end side of the pile, and curing the first filler;
After curing the first filling material, one end side of the support pillar is inserted into the connection pipe from the other end side opposite to the one end side of the connection pipe until it abuts against the first filling material. Installing the pillar on the filler,
Filling a second filling material between the pillar and the connecting pipe, and hardening the second filling material;
A method for constructing a pile connection strut structure, comprising: The pile is formed in a tubular shape,
Before the step of filling with the first filling material, a step of installing a lid on one end side of the pile installed in the ground so as to close the inside of the pile, or installed in the ground 18. The method of constructing a pile connection strut structure according to claim 17, further comprising a step of packing a packing material inside the pile.

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