JP6430271B2 - Footing-integrated foundation pile structure and construction method of footing-integrated foundation pile - Google Patents

Description

  The present invention relates to a footing-integrated foundation pile structure in which an upper end portion of a foundation pile configured by burying an already-made pile is easily fixed to a footing of an upper structure, and a method for constructing a footing-integrated foundation pile.

  By fixing the upper end of the conventional foundation pile to the lower end (footing) of the upper structure, various loads such as the vertical load of the upper structure could be received by the foundation pile. It has been troublesome to connect a ready-made pile, which is usually a concrete or steel structure with a circular cross-section, and an upper structure of a reinforced concrete structure, steel structure, or steel reinforced concrete structure. In general, for concrete foundation piles, it is necessary to break the concrete at the upper end to expose the structural reinforcing bars, which is troublesome.

Thus, for example, there has been a proposal that a ready-made pile made of concrete has a structure in which the upper end portion is easily broken by applying a release agent around the structural rebar at the upper end portion (Patent Document 1).
There has also been a proposal to join a steel pipe to the upper end of a ready-made pile, fill the steel pipe with concrete, and embed the lower end of the steel column in the concrete (Patent Document 2).
Moreover, in the steel pipe pile, the invention which provides a through-hole in the upper end part of a steel pipe and lets the reinforcing bar for footing pass is also proposed (patent documents 3 and 4).

JP 2011-80313 A JP 2004-162374 A JP 2002-227220 A JP 2001-302584 A

  When the concrete part of the upper end of the ready-made pile is broken to expose the structural reinforcement (Patent Document 1), it is necessary to treat the release agent so as not to hinder the subsequent fixation of the structural reinforcement, and the upper end of the ready-made pile. In the case where the steel pipe for connection is fixed in advance (Patent Document 2), it is necessary to devise the work of burying with a pile driving machine. Moreover, when providing the through-hole which lets the reinforcing bar of a footing pass in the upper end part of a steel pipe (patent documents 3 and 4), the device was similarly needed at the time of construction. Furthermore, when a steel pipe is disposed at the upper end, there is a problem that the inner surface of the steel pipe is soiled during construction.

  In the present invention, a steel pipe is disposed on the outer periphery of a pile body of a ready-made pile made of concrete, the upper end of the steel pipe is protruded from the upper end of the pile body, and an attachment having a flat side surface is disposed. Since the easy-to-removable protective cylinder is arranged above the upper end of the main body, the above-mentioned problems have been solved.

That is, the invention of the foundation pile structure is a footing-integrated foundation pile structure in which a ready-made pile is embedded in a pile hole and a footing structure is constructed at the upper end of the ready-made pile as follows. .
(1) The ready-made pile is “a ready-made pile in which the outer periphery of a concrete pile body is covered with a steel pipe, and an upper end portion of the steel pipe is protruded from an upper end of the pile body” or “a concrete pile. A plurality of first through holes were formed in advance on the upper end portion of the steel pipe.
(2) At the upper end of the ready-made pile, a steel attachment in which a square tube part having a flat side surface is formed at least at the upper part or the lower part is arranged in the steel pipe or on the outer peripheral side of the steel pipe, and provided in the attachment. The second through hole communicated with the first through hole, a fixing means was inserted into the first through hole and the second through hole, and the attachment was fixed to the upper end portion of the steel pipe.
(3) At least one of the first through hole and the second through hole is a laterally long hole.
(4) The footing structure is fixed to the flat side surface of the rectangular tube portion of the attachment.

In the above, the foot pile-integrated foundation pile structure is characterized as follows.
(1) The ready-made pile was defined as “a ready-made pile in which the outer periphery of a concrete pile body was covered with a steel pipe, and the upper end portion of the steel pipe was protruded from the upper end of the pile body”.
(2) An inner surface of the steel pipe, and a protective cylinder having substantially the same cross-sectional shape as the pile main body is installed above the pile main body, and the outer surface of the protective cylinder is in close contact with the inner surface of the steel pipe. The steel pipe was buried in a pile hole with the first through hole of the steel pipe closed.
(3) In the state where the laying of the ready-made pile was completed, the protective cylinder was removed, and an attachment was fixed to the ready-made pile.

Moreover, in the above, it is the footing-integrated foundation pile structure characterized by being comprised as follows.
(1) The attachment was made of a square tube having a square cross section, and a second through-hole made of a transverse long hole was formed at the bottom.
(2) The lower inner surface of the attachment has a shape capable of loosely fitting the upper end of the ready-made pile.

Further, the invention of another foundation pile structure is characterized in that a ready-made pile is embedded in a pile hole, and a footing structure is constructed at the upper end of the ready-made pile as follows. It is.
(1) The ready-made pile is “a ready-made pile in which the outer periphery of a concrete main body is covered with a steel pipe, and an upper end portion of the steel pipe protrudes from an upper end of the main body” or “a concrete pile main body. It was designated as a ready-made pile with a steel pipe connected on top.
(2) An easily removable protective cylinder is disposed on the inner surface of the steel pipe and above the pile body.
(3) After burying the ready-made pile, the protective cylinder was removed, and the footing structure was fixed to the upper end of the steel pipe.

In the invention of each foundation pile structure, the foundation pile structure is integrated with a footing and is configured as follows.
(1) The ready-made pile was provided with a lower end plate for connection with other ready-made piles at the lower end, an upper end plate at the upper end of the pile body, and a protruding end plate at the upper end of the steel pipe.
(2) Another concrete-made lower ready-made pile was buried in the pile hole, and the ready-made pile was connected on the lower concrete.

The invention of the construction method is characterized in that a ready-made pile is embedded in a pile hole, and a footing structure is constructed at the upper end of the ready-made pile via a steel attachment as follows. This is a method of constructing an integral foundation pile.
(1) The ready-made pile is constructed as follows.
(a) The outer periphery of a concrete pile body is covered with a steel pipe, and the upper end portion of the steel pipe protrudes above the upper end of the pile body.
(b) A plurality of first through holes are formed at the upper end of the steel pipe.
(c) At the upper end of the pile main body, a protective cylinder having substantially the same cross-sectional shape as the pile main body is detachably installed, the outer surface of the protective cylinder is brought into close contact with the inner surface of the steel pipe, One through hole is closed.
(2) The attachment is composed of an upper part and a lower part, and at least the upper part is formed of a square cylinder having a flat side surface, and "the lower part can be loosely inserted in the steel pipe of the ready-made pile, or on the outer periphery of the steel pipe. “A shape that can be loosely fitted” and “a second through hole made of a transverse long hole is formed in the lower portion.”
(3) A pre-made pile having the protective cylinder body is buried in the pile hole while excavating a predetermined pile hole or excavating the pile hole.
(4) After burying the ready-made pile to a predetermined depth, the protective cylinder is removed from the ready-made pile, and the inner surface and the first through hole of the upper end portion of the steel pipe are exposed.
(5) The attachment is installed in the steel pipe or on the outer peripheral side of the steel pipe, the second through hole provided in the attachment and the first through hole are communicated, and the first through hole and the second through hole And fixing the attachment to the upper end of the steel pipe.
(6) The footing structure is fixed to the flat side surface at the top of the steel attachment.

Further, the invention of another construction method is to construct a footing-integrated foundation pile characterized by burying a ready-made pile in a pile hole and constructing a footing structure at the upper end of the ready-made pile as follows Is the method.
(1) The ready-made pile is constructed as follows.
(a) The outer periphery of a concrete pile body is covered with a steel pipe, and the upper end portion of the steel pipe protrudes above the upper end of the pile body.
(b) A protective cylinder having substantially the same cross-sectional shape as the pile main body is detachably installed at the upper end of the pile main body, and the outer surface of the protective cylinder is in close contact with the inner surface of the steel pipe.
(2) A pre-made pile having the protective cylinder is embedded in the pile hole while excavating a predetermined pile hole or excavating the pile hole.
(3) After burying the ready-made pile to a predetermined depth, the protective cylinder is removed from the ready-made pile and the inner surface of the upper end portion of the steel pipe is exposed.
(4) The footing structure is fixed to the inner surface or the outer surface of the upper end portion of the steel pipe.

In this invention, the steel pipe is arranged on the outer periphery of the pile body of the ready-made pile made of concrete, the upper end of the steel pipe is protruded from the upper end of the pile body, and the attachment having the flat side surface is arranged. By finely adjusting the defects, the underground beam can be easily fixed to the attachment, and a ready-made pile integrated with the footing can be easily constructed. In particular, since the footing will be enlarged, such as when the ready-made pile has a diameter exceeding 1 m, construction of the footing formwork and the arrangement of the ready-made pile in the footing will be simplified for construction. Can be simplified and the construction period can be shortened.
In addition, a protective cylinder that is easy to remove is placed on the inner surface of the steel pipe and above the top of the pile body, so that the inner surface of the steel pipe is protected and the work such as cleaning the steel pipe is omitted until the construction of the underground beam. The construction work of underground beams can be simplified.

It is an attachment used in an embodiment of the present invention, (a) is a front view, (b) is an A1-A1 cross-sectional view of the upper part, (c) is a cross-sectional view of the lower AA line, (d) is an attachment and a ready-made pile. A2-A2 sectional view showing the state which connected, and (e) is an A2-A2 sectional view showing the state where the attachment and the ready-made pile were made into another connection. In other attachments used in the embodiment of the present invention, (a) is a plan view, (b) is a front view, (c) is a bottom view, (d) is a BB cross-sectional view, (e) (f) Represents a BB cross-sectional view in a state of being connected to a ready-made pile. It is the ready-made pile used by the embodiment of this invention, (a) is a longitudinal cross-sectional view, (b) is CC sectional drawing, (c) is a longitudinal cross-sectional view showing the state which removed the protection cylinder etc. FIG. (A)-(d) is the schematic longitudinal cross-sectional view showing the procedure of constructing the foundation pile structure integrated with a footing. (A)-(c) is the schematic longitudinal cross-sectional view showing the procedure of constructing the foundation pile structure of another footing integral. (A)-(c) is the schematic longitudinal cross-sectional view showing the procedure of constructing the foundation pile structure of another footing integral.

  Embodiments of the present invention will be described with reference to the drawings.

1. Configuration of ready-made pile 1

(1) The ready-made pile 1 used for implementation of this invention is the structure formed by providing the steel pipe 10 in the outer periphery of the concrete pile main body 2, and is a structure called what is called SC pile.
(2) The pile main body 2 is provided with a donut-shaped upper end plate 3 and a lower end plate 4, and a dense compressive strength is large inside the steel pipe 10 (between the lower end plate 4 and the upper end plate 3) (for example, compression) Strength (approximately 105 N / mm ² ) is filled with concrete (mortar) 5.
It is possible to embed an axial steel material such as a structural reinforcing bar or a PC steel bar between the donut-shaped upper end plate 3 and the lower end plate 4 or to dispose nothing.
(3) The steel pipe 10 protrudes from the lower end plate 4 of the pile body 2 beyond the upper end plate 3 of the pile body 2 and further upwards by a height L from the upper surface of the pile body 2 (upper surface of the upper end plate 3). That is, the upper end plate 3 is disposed below the upper end of the steel pipe 10 by L.
A donut-shaped protruding end plate 14 (same structure as the upper end plate 3 and the lower end plate 4) is attached to the upper end of the steel pipe 10, and the concrete (mortar) of the pile body 2 is interposed between the upper end plate 3 and the protruding end plate 14. 5 (for example, compressive strength of about 60 to 80 N / mm ² ) concrete (mortar) 16 is filled.
Further, in the steel pipe 10, a portion corresponding to the pile body 2 (between the lower end plate 4 and the upper end plate 3) is defined as a base 11, and a portion from the upper end plate 3 to the projecting end plate 14 is defined as a projecting portion 12. At the upper part of the projecting portion 12 of the steel pipe 10, the first through holes 13, 13 consisting of long holes in the lateral direction are rotationally symmetrical around the axis at four locations (at an angle of 90 °), and at intervals of up and down 2 It arrange | positions to a stage (FIG. 3 (a) (b)).
(4) The ready-made pile 1 having the above structure is manufactured by centrifugal molding. The steel pipe 10 is formed in a cylindrical shape having an outer diameter D01 and an inner diameter D02. Further, since the concrete 5 is sandwiched between the upper end plate 3 and the lower end plate 4, and the concrete 16 is sandwiched between the upper end plate 3 and the projecting end plate, both the concretes 5 and 16 are not mixed and can be easily formed by centrifugal molding (donuts). Mold).

(5) Other configurations of the ready-made pile 1 (a) In the embodiment of the ready-made pile 1, the concrete (mortar) 16 is filled as a protective cylinder, but when the concrete 16 is formed by centrifugal molding, the concrete 16 is used. Furthermore, it fills also in the 1st through-holes 13 and 13 (it forms the protrusion fitted in the 1st through-holes 13 and 13 in the outer surface of the concrete 16), and the 1st through-holes 13 and 13 are constructed during construction. It can also be protected from contamination (not shown).
(B) Moreover, in the embodiment of the said ready-made pile 1, although the protrusion part 12 of the steel pipe 10 was filled with the concrete (mortar) 16 with comparatively small compressive strength as a protection cylinder, the protrusion of the steel pipe 10 was carried out at the time of burial work. Since it is preferable that the inner surface 12a of the part 12 is not soiled by mud, a covering (protective cylinder) such as a sheet or an easily breakable resin block (made of polystyrene foam) is disposed on the inner surface 12a of the protruding part 12 of the steel pipe 10. If so, the concrete (mortar) 16 can be omitted (not shown). Moreover, if the inner surface 12a of the protrusion part 12 of the steel pipe 10 can be cleaned at the time of construction, a covering such as a sheet can be omitted (not shown).
(C) Moreover, in the embodiment of the said ready-made pile 1, although the steel pipe 10 covered the whole pile main body 2, if the sufficient bending strength can be ensured only with the pile main body 2 without a steel pipe, the outer periphery will be the concrete surface normally A pile main body 2 is constructed from a concrete pile of the other, and the lower end of a steel pipe 10 having a length L (corresponding to the protruding portion 12) is connected to the upper end plate 3 of the pile main body 2 by welding or the like to constitute the ready-made pile 1. (Not shown).
(D) In the embodiment of the ready-made pile 1, the protruding end plate 14 is detachably attached to the steel pipe 10, and the anchor is fixed downward on the lower surface of the protruding end plate 14. It can also be set as the structure where the concrete 16 located in the protrusion part 12 of the steel pipe 10 is also pulled up if a board is pulled up (not shown).

2. Structure of attachment 20

(1) The attachment main body 21 is composed of a square tube having a substantially square cross section having an inner dimension of one side L1 that can loosely inscribe a circle having an outer diameter D01 (= the outer diameter of the ready-made pile 1). Since the attachment main body 21 has a substantially square cross section, the attachment main body 21 has four side surfaces 25 and 25 that are perpendicular to each other in plan view, and the side surfaces 25 and 25 form a flat side surface. “Loosely inscribed” in the above means a structure having a gap that can be rotated around an axis between the inner surface 21a of the attachment main body 21 and the outer surface 12a of the protruding portion 12 of the steel pipe 10 of the ready-made pile 1 (see FIG. 1 (d)). Further, the flat side surface is usually substantially vertical and refers to a surface (vertical surface) having no unevenness or bending to the extent that the end surface of the steel underground beam can be joined.
Normally, a ground structure has a configuration in which beams and the like are arranged in a direction (90 °) perpendicular to each other in the X direction and the Y direction in plan view, and accordingly, a side surface (flat side surface) 25 is configured. The attachment 20 has a square cross section so that it can be made.
(2) The second through-holes 26 and 26 are formed in the lower portion 23 of the attachment body 21 (lower portions of the side surfaces 25 and 25) corresponding to the first through-holes 13 and formed by laterally elongated holes. . As with the first through-hole 13, the second through-holes 26 are provided in four locations (at an angle of 90 °) in a rotationally symmetric manner around the axis, and are arranged in two stages with an interval H0 vertically. Note that the second through hole 26 may be a multi-stage having two or more stages (not shown).
The attachment 20 is comprised as mentioned above (FIG. 1 (a)-(c)).

(3) Other configuration of the attachment 20 (a) In the embodiment of the attachment 20, the attachment main body 21 is composed of a square tube having an inner dimension of one side L1 that can loosely inscribe a circle having an outer diameter D01. This is preferable because the alignment of the first through-hole 13 and the second through-hole 26 of the steel pipe 10 of the pile 1 and the fixing work with the bolts are facilitated, but the core of the ready-made pile 1 has shifted to the extent permitted by design. In some cases, a looseness to absorb this may be included. Furthermore, when it is not necessary to make the steel pipe 10 of the ready-made pile 1 and the axis center of the attachment 20 correspond, the inner surface 21a of the attachment main body 21 and the outer surface 12b of the protrusion 12 of the steel pipe 10 of the ready-made pile 1 are further The gap can be increased.
(B) In the embodiment of the attachment 20, the attachment body 21 is configured from a square tube having a square cross section. However, the cross section may be a rectangle. In the case where the axial direction is set in the X, Y, and Z directions intersecting at 60 ° with each other based on the triangle, the rhombus or parallelogram with an internal angle or external angle of 60 ° or 120 ° It is also possible to adopt a square tube having a cross-sectional shape such as a triangle or a hexagon (not shown).
(C) In the embodiment of the attachment 20, the attachment main body 21 has a cylindrical shape with the same cross section from the upper end to the lower end, but the side surface (flat side surface) 25 is formed on the upper portion 22, and the ready-made pile is formed on the lower portion 23. If the 2nd through-holes 26 and 26 joined with the 1 steel pipe 10 can be formed, a cross-sectional shape can also be changed with the upper part 22 and the lower part 23. FIG.
For example, the upper portion 22 can be a square in cross section, and the lower portion 23 can be in the shape of a square in cross section that can be loosely fitted on the outer surface 12b side of the protrusion 12 of the steel pipe 10 of the ready-made pile 1 (FIGS. 2A to 2 ( f)). In this case, the second right through holes 26 are formed in the circular portion of the lower portion 23 in the cross section.
(D) In the embodiment of the attachment 20, the side surface (flat side surface) 25 is formed on the upper portion 22 of the attachment 20 and the second through holes 26 and 26 are formed on the lower portion 23. It is also possible to form the second through hole 26 in the upper portion 22 (not shown) by forming a flat side surface 25.
(E) In the embodiment of the attachment 20, when the lower end 23 of the attachment 20 is inserted into the inner surface 12 a of the protrusion 12 of the steel pipe 10 of the ready-made pile 1, the inner diameter D02 of the protrusion 12 of the steel pipe 10. It is set as the attachment 20 which has the main body 21 of the length L4 of one side corresponding to (FIG.1 (e)).

3. Construction method

(1) Similar to the construction of a normal ready-made pile 1, a pile hole 32 is excavated from the ground 31, and a predetermined number of lower ready-made piles (lower piles) 33, 33 are connected and buried, and the lowermost part of the uppermost stage The ready-made pile (upper pile) 1 is connected on the ready-made pile 33 (FIG. 4A). Similarly to the conventional method, as a so-called medium digging method, the lower ready-made piles 33 and 33 and the ready-made pile 1 connected while excavating the pile hole 32 while connecting the ready-made piles 1 and 33 can be embedded.
(2) Subsequently, the ground 31 is dug to a predetermined depth to form the leveling ground 34 corresponding to the lower surface of the footing to be formed. After, before or simultaneously with the formation of the leveling surface 34, the concrete 16 on the inner surface is removed by the projecting portion 12 of the steel pipe 10, and if necessary, the projecting end plate 14 is also removed (FIG. 4 (b)). Since the concrete 16 is located on the inner surface of the steel pipe 10 up to this state, the first through holes 13 and 13 are blocked by the concrete 16. Can be prevented and the first through holes 13 and 13 can be easily cleaned.
Then, the lower part 23 of the attachment 20 is covered on the outer peripheral side of the protrusion part 12 of the steel pipe 10, and the 1st through-holes 13 and 13 and the 2nd through-holes 26 and 26 are connected. At this time, the first through-hole 13 and the second through-hole 26 are laterally long holes and are equally spaced H0 up and down, so that the side surface (flat side surface) 25 of the attachment 20 is vertical and horizontal. The communication operation of the first through hole 13 and the second through hole 26 can be made accurate and simple while matching the direction with a predetermined direction.
(3) Subsequently, the washer plate (fixing means) is fixed to the inner surface 12a of the steel pipe 10 around the first through hole 13 and the second through hole 26 while the first through hole 13 and the second through hole 26 are communicated with each other. 36) The washer plate (fixing means) 37 is directed to the outer surface 21b of the attachment 20, and the bolt (fixing means) 38 is attached from the washer plate (fixing means) 36 side to the washer plate (fixing means) 37, the first through hole 13, The nut (fixing means) 39 is screwed and fastened through the second through hole 26 and the washer plate (fixing means) 37. Thereby, the protrusion part 12 and the attachment 20 of the steel pipe 10 of the ready-made pile 1 are fixed firmly. The footing-integrated foundation pile structure 50 is configured as described above (FIG. 4C).
Subsequently, one end of an underground beam (footing structure) 41 for footing made of H-shaped steel is fixed to the side surface 25 of the attachment 20 (FIG. 4D). Further, other necessary footing is arranged and concrete is placed to form the footing (not shown).
(4) The first through-hole 13 and the second through-hole 26 are communicated at all eight places and the bolts 38 are inserted, but at least the two sets of the first through-hole 13 and the second through-hole communicated. A bolt 38 may be inserted into and fixed to 26 (not shown).

4). Other embodiments

(1) In the said embodiment, although it was set as the underground beam which consists of H-shaped steel as a footing structure body, it can also be used as steel materials, such as a steel frame or a reinforcing bar of the other cross-sectional shape used normally (not shown).

(2) In the above-described embodiment, the attachment 20 can be configured by fixing a footing structure piece (an end portion of the footing structure) to the side surfaces 25 and 25 of the attachment 20 in advance (not shown). . In this case, between the adjacent attachments 20, 20, the footing structure is laid between the footing structure pieces and fixed.

(3) Moreover, in the said embodiment, the lower end part of the column (usually steel-made) 42 of a ground structure can also be inserted and fixed inside the attachment 20 (FIG.4 (c) (d)). Chain line 42).

(4) Moreover, in the said embodiment, although the underground beam 41 was fixed to the side surface 25 of the attachment 20, this was abbreviate | omitted, and the pillar (usually steel-made) which fixed the underground beam 41 inside the attachment 20 ) 42 can also be inserted and fixed (FIGS. 5A to 5C). In this case, the lower end of a column (usually made of steel) 42 to which the underground beam 41 is fixed can be fitted and fixed to the outside of the attachment 20 (not shown).

(5) Moreover, in the said embodiment, the 1st through-hole 13 is made to respond | correspond to the steel pipe 10 of the ready-made pile 1, and the 2nd through-hole 26 is made to correspond to the attachment 20, respectively, and four places (angle 90 degrees) are rotationally symmetrical around an axis | shaft. Provided) and arranged in two stages with a vertical interval H0. The first through hole 13 or the second through hole 26 corresponds to the attachment 20 and the second through hole 26, respectively. Although four rotationally symmetrically provided in two upper and lower stages, it is sufficient that at least two first through holes 13 and second through holes 26 are formed (not shown).

(6) In the above embodiment, bolts 38, nuts 39 and the like are used as the fixing means. However, when fixing two plate materials using through holes such as rivets and various pins, it is usual. The various members used can also be used (not shown).

(7) Moreover, in the said embodiment, the attachment 20 is abbreviate | omitted and the lower end part of the column (usually steel-made) 42 which fixed the underground beam 41 inside the protrusion part 12 of the steel pipe 10 of the ready-made pile 1 is carried out. It can also be inserted and fixed (FIGS. 6A to 6C).
In this case, as in the above embodiment, a pile hole 32 is excavated from the ground 31, and a predetermined number of ready-made piles (lower piles) 33, 33 are buried and connected to the top. The piles 1 are connected (FIG. 6A). Subsequently, the ground 31 is dug to a predetermined depth to form the leveling ground 34 corresponding to the lower surface of the footing to be formed. After or before or after the formation of the leveling surface 34, the concrete 16 on the inner surface is removed by the projecting portion 12 of the steel pipe 10, and the projecting end plate 14 is also removed (FIG. 6B). Subsequently, the upper structure pillar 42 is inserted inside the protruding portion 12 of the steel pipe 10, and the pillar 42 and the steel pipe 10 are fixed by welding or the like to form the foundation pile structure 50 (FIG. 6C). In this case, the underground beam 41 is fixed to the column 42 by a normal method in advance or afterwards.In this case, if the lower end of the column 42 is applied to the lower end plate 3, the joining work between the column 42 and the steel pipe 10 can be facilitated. .
In this case, the lower end portion of a column (usually made of steel) 42 to which the underground beam 41 is fixed can be fitted and fixed to the outside of the protruding portion 12 of the steel pipe 10 (not shown). In this case, if the concrete 16 can be removed, it is not necessary to remove the protruding end plate 14.
Moreover, when the attachment 20 is abbreviate | omitted, the 1st through-holes 13 and 13 can also be abbreviate | omitted (FIG. 6). Moreover, when omitting an attachment, if the upper part of the steel pipe 10 is a square tube (similar to the attachment such as a square cross section and a hexagon), the connection work with the upper structure is facilitated (not shown).

DESCRIPTION OF SYMBOLS 1 Ready-made pile 2 Pile body of ready-made pile 3 Upper end plate of pile body 4 Lower end plate of pile body 5 Concrete of pile body 10 Steel pipe 11 Steel pipe base 12 Steel pipe protrusion 12a Steel pipe inner surface 12b Steel pipe outer surface 13 Steel pipe first Through hole 14 Projecting end plate 16 Concrete (protective cylinder)
20 Attachment 21 Attachment body 21a Body inner surface 21b Body outer surface 22 Upper part of attachment body 23 Lower part of attachment body 25 Side of attachment (flat side)
26 Second through hole 31 of attachment 31 Ground 32 Pile hole 33 Ready-made pile (lower pile)
34 Ground leveling 36 Washer plate (fixing means)
37 Washer plate (fixing means)
38 bolts (fixing means)
39 Nut (fixing means)
41 Underground beam (footing structure)
42 Pillar (footing structure)
50 Foundation pile structure with one footing

Claims (7)

A foot pile-integrated foundation pile structure in which a ready-made pile is buried in a pile hole and a footing structure is constructed at the upper end of the ready-made pile as follows.
(1) The ready-made pile is “a ready-made pile in which the outer periphery of a concrete pile body is covered with a steel pipe, and an upper end portion of the steel pipe is protruded from an upper end of the pile body” or “a concrete pile. A plurality of first through holes were formed in advance on the upper end portion of the steel pipe.
(2) At the upper end of the ready-made pile, a steel attachment in which a square tube part having a flat side surface is formed at least at the upper part or the lower part is arranged in the steel pipe or on the outer peripheral side of the steel pipe, and provided in the attachment. The second through hole communicated with the first through hole, a fixing means was inserted into the first through hole and the second through hole, and the attachment was fixed to the upper end portion of the steel pipe.
(3) At least one of the first through hole and the second through hole is a laterally long hole.
(4) The footing structure is fixed to the flat side surface of the rectangular tube portion of the attachment. The foot pile-integrated foundation pile structure according to claim 1, wherein the foundation pile structure is configured as follows.
(1) The ready-made pile was defined as “a ready-made pile in which the outer periphery of a concrete pile body was covered with a steel pipe, and the upper end portion of the steel pipe was protruded from the upper end of the pile body”.
(2) An inner surface of the steel pipe, and a protective cylinder having substantially the same cross-sectional shape as the pile main body is installed above the pile main body, and the outer surface of the protective cylinder is in close contact with the inner surface of the steel pipe. The steel pipe was buried in a pile hole with the first through hole of the steel pipe closed.
(3) In the state where the laying of the ready-made pile was completed, the protective cylinder was removed, and an attachment was fixed to the ready-made pile. The foot pile-integrated foundation pile structure according to claim 1, wherein the foundation pile structure is configured as follows.
(1) The attachment was made of a square tube having a square cross section, and a second through-hole made of a transverse long hole was formed at the bottom.
(2) The lower inner surface of the attachment has a shape capable of loosely fitting the upper end of the ready-made pile. A foot pile-integrated foundation pile structure in which a ready-made pile is buried in a pile hole and a footing structure is constructed at the upper end of the ready-made pile as follows.
(1) The ready-made pile is “a ready-made pile in which the outer periphery of a concrete main body is covered with a steel pipe, and an upper end portion of the steel pipe protrudes from an upper end of the main body” or “a concrete pile main body. It was designated as a ready-made pile with a steel pipe connected on top.
(2) An easily removable protective cylinder is disposed on the inner surface of the steel pipe and above the pile body.
(3) After burying the ready-made pile, the protective cylinder was removed, and the footing structure was fixed to the upper end of the steel pipe. 5. The footing-integrated foundation pile structure according to claim 1, wherein the foundation pile structure is configured as follows.
(1) The ready-made pile was provided with a lower end plate for connection with other ready-made piles at the lower end, an upper end plate at the upper end of the pile body, and a protruding end plate at the upper end of the steel pipe.
(2) Another concrete-made lower ready-made pile was buried in the pile hole, and the ready-made pile was connected on the lower concrete. A method for constructing a footing-integrated foundation pile characterized by burying a ready-made pile in a pile hole and constructing a footing structure at the upper end of the ready-made pile through a steel attachment as follows.
(1) The ready-made pile is constructed as follows.
(a) The outer periphery of a concrete pile body is covered with a steel pipe, and the upper end portion of the steel pipe protrudes above the upper end of the pile body.
(b) A plurality of first through holes are formed at the upper end of the steel pipe.
(c) At the upper end of the pile main body, a protective cylinder having substantially the same cross-sectional shape as the pile main body is detachably installed, the outer surface of the protective cylinder is brought into close contact with the inner surface of the steel pipe, One through hole is closed.
(2) The attachment is composed of an upper part and a lower part, and at least the upper part is formed of a square cylinder having a flat side surface, and "the lower part can be loosely inserted in the steel pipe of the ready-made pile, or on the outer periphery of the steel pipe. “A shape that can be loosely fitted” and “a second through hole made of a transverse long hole is formed in the lower portion.”
(3) A pre-made pile having the protective cylinder body is buried in the pile hole while excavating a predetermined pile hole or excavating the pile hole.
(4) After burying the ready-made pile to a predetermined depth, the protective cylinder is removed from the ready-made pile, and the inner surface and the first through hole of the upper end portion of the steel pipe are exposed.
(5) The attachment is installed in the steel pipe or on the outer peripheral side of the steel pipe, the second through hole provided in the attachment and the first through hole are communicated, and the first through hole and the second through hole And fixing the attachment to the upper end of the steel pipe.
(6) The footing structure is fixed to the flat side surface at the top of the steel attachment. A method for constructing a footing-integrated foundation pile characterized by burying a ready-made pile in a pile hole and constructing a footing structure at the upper end of the ready-made pile as follows.
(1) The ready-made pile is constructed as follows.
(a) The outer periphery of a concrete pile body is covered with a steel pipe, and the upper end portion of the steel pipe protrudes above the upper end of the pile body.
(b) A protective cylinder having substantially the same cross-sectional shape as the pile main body is detachably installed at the upper end of the pile main body, and the outer surface of the protective cylinder is in close contact with the inner surface of the steel pipe.
(2) A pre-made pile having the protective cylinder is embedded in the pile hole while excavating a predetermined pile hole or excavating the pile hole.
(3) After burying the ready-made pile to a predetermined depth, the protective cylinder is removed from the ready-made pile and the inner surface of the upper end portion of the steel pipe is exposed.
(4) The footing structure is fixed to the inner surface or the outer surface of the upper end portion of the steel pipe.

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