JP2016223094A - Pile head connection device, pile head connection structure, and pile head connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile head connection device that facilitates configuration of a pile head connection structure regardless of an error in a pile installation position, along with a pile head connection structure using the pile head connection device and a pile head connection method.SOLUTION: A pile head connection device 12 includes a cylindrical body part 15 made of concrete, and a plurality of reinforcing bars 16 that may be fastened on the body part and extended in an axial direction of the body part. The body part 15 may be installed to surround a pile head part 20, leaving a gap into which a filler may be filled. A variable amount of an installation position of the body part 15 in a horizontal direction is set such that when positioning the body part 15 relative to the pile head part 20, the variable amount is 0.15 times or more of an outer diameter of the pile head part 20.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates to a pile head joining device, a pile head joining structure, and a pile head joining method.

  The pile foundation that supports the superstructure is generally composed of a plurality of piles, a pile cap that is provided so as to surround the pile head of the pile, and a beam that connects the pile caps. The pile cap is made of reinforced concrete, and a plurality of reinforcing bars fixed to the pile heads extend in the vertical direction inside the pile cap. In addition, a plurality of reinforcing bars for the beam extend vertically and horizontally inside the pile cap in the horizontal direction, and if necessary, a plurality of reinforcing bars for the superstructure pillars extend inside the pile cap. Each extends in the vertical direction.

  Thus, the number of reinforcing bars extending inside the pile cap is large, and it takes time to arrange and fix these reinforcing bars. Therefore, it is conceivable to employ a precast concrete pile head reinforcing unit as disclosed in Patent Document 1. The precast concrete pile head reinforcing unit includes a concrete frame that surrounds the pile head and an integrated bar that protrudes upward from the concrete frame, and can be manufactured in advance. If the precast concrete pile head reinforcement unit made in advance is carried in and installed in the field, the arrangement of the reinforcing bars and the fixing work on the field can be simplified.

Japanese Patent No. 2891167

Although the pile head reinforcement structure of patent document 1 is applied to the footing, it can also be applied to a pile cap. In this case, the integral muscle extends inside the pile cap.
Here, there is some error in the installation position of the pile after construction, and it is considered that an error also occurs in the installation position of the precast concrete pile head reinforcement unit, and in turn, the installation position of the integral reinforcement corresponding to this error. .

  On the other hand, the position of the reinforcing bar for the beam or column is determined regardless of the error in the installation position of the pile. For this reason, when the precast concrete pile head reinforcement unit of patent document 1 is applied to a pile cap, if the arrangement position of the integral reinforcement is shifted due to an error in the installation position of the pile, the integral reinforcement and the beam or column There is a risk of interference with the reinforcing bars.

  In view of the above circumstances, an object of at least one embodiment of the present invention is to use a pile head joining device that facilitates construction of a pile head joining structure regardless of an error in the pile installation position, and the pile head joining device. An object of the present invention is to provide a pile head joining structure and a pile head joining method.

(1) A pile head joining device according to at least one embodiment of the present invention,
A main body made of concrete and having a cylindrical shape;
A plurality of reinforcing bars capable of being fixed to the main body and extending in the axial direction of the main body,
The main body can be installed so as to surround the pile head with a gap that can be filled with a filler,
When positioning the main body with respect to the pile head, a variable amount of the installation position of the main body in the horizontal direction is configured to be not less than 0.15 times the outer diameter of the pile head.

  According to the configuration (1), in the pile head joining apparatus, the variable amount of the installation position of the main body in the horizontal direction is 0.15 of the outer diameter of the pile head when the main body is positioned with respect to the pile head. Since it is comprised so that it may become more than twice, even if an error arises in the installation position of a pile, this error can be absorbed and a main-body part can be arrange | positioned in a desired installation position. Therefore, even if an error occurs in the installation position of the pile, the relative positional relationship between the reinforcing bar fixed to the main body part and the reinforcing bar for the beam or the column does not change and is fixed to the main body part. Interference between the reinforcing bar and the reinforcing bar for the beam or column can be prevented. As a result, if the pile head joining apparatus of the said structure (1) is used, a pile head joining structure can be easily constructed | assembled irrespective of the error of the installation position of a pile.

(2) In some embodiments, in the configuration (1),
When positioning the main body with respect to the pile head, the variable amount of the installation position of the main body in the horizontal direction is configured to be 0.15 times or more and 100 mm or more of the outer diameter of the pile head. Yes.
According to the above configuration (2), since the variable amount of the installation position of the main body in the horizontal direction is 100 mm or more, the error in the installation position of the pile is reliably absorbed regardless of the outer diameter of the pile head. In addition, the filler can be easily and reliably filled in the gap.

(3) In some embodiments, in the configuration (1) or (2),
Seeing in the axial direction of the main body, the outer edge of the main body has a rectangular shape,
The plurality of reinforcing bars can be arranged along an outer edge of the main body.
According to the configuration (3), the separation direction of the reinforcing bars that can be fixed to the main body portion can be matched with the separation direction of the reinforcing bars for the beam or the column, and the interference of these reinforcing bars can be further increased. It can be avoided reliably.

(4) In some embodiments, in any one of the configurations (1) to (3),
The plurality of reinforcing bars are constituted by U-shaped bars,
The bent portion of the U-shaped line is embedded in the main body portion.
According to the said structure (4), the adhesive force of the reinforcing bar with respect to a main-body part can be heightened because the bending part of the U-shaped line as a reinforcing bar is embed | buried in a main-body part. For this reason, the length of the main-body part in an axial direction can be shortened, and the weight reduction of a pile head joining apparatus can be achieved.

(5) In some embodiments, in any one of the configurations (1) to (4),
A coupler is fixed to the main body,
The reinforcing bar can be fixed to the main body through the coupler.
According to the configuration (5), the reinforcing bar can be fixed to the main body part via the coupler. When the main body part and the reinforcing bar are transported to the site, the main body part and the reinforcing bar can be transported separately. it can. For this reason, a pile head joining apparatus can be conveyed easily.

(6) In some embodiments, in any one of the above configurations (1) to (5),
It further comprises a reinforcing member constituted by a plurality of reinforcing bars combined in a hat shape,
At least a part of the reinforcing member is embedded in the main body.
According to the said structure (6), the intensity | strength of the pile head joining structure using a pile head joining apparatus can be made higher by a hat-shaped reinforcement member.

(7) Pile head joint structure according to at least one embodiment of the present invention,
Piles,
A pile head joining device comprising: a main body portion made of first concrete and having a cylindrical shape; and a plurality of reinforcing bars fixed to the main body portion and extending in the axial direction of the main body portion. The main body portion can be installed so as to surround the pile head portion with a gap that can be filled with a filler, and the main body portion in the horizontal direction when positioning the main body portion with respect to the pile head portion A pile head joining device configured such that the variable amount of the installation position of the pile head is 0.15 times or more the outer diameter of the pile head;
A filler filled in the gap;
A second concrete placed so as to surround the reinforcing bar;
Is provided.

  According to the said structure (7), when the pile head joining apparatus positions the main-body part with respect to a pile head, the variable amount of the installation position of the main-body part in a horizontal direction is 0.15 of the outer diameter of a pile head. Since it is comprised so that it may become more than twice, even if an error arises in the installation position of a pile, this error can be absorbed and a main-body part can be arrange | positioned in a desired installation position. Therefore, even if an error occurs in the installation position of the pile, the relative positional relationship between the reinforcing bar fixed to the main body part and the reinforcing bar for the beam or the column does not change and is fixed to the main body part. Interference between the reinforcing bar and the reinforcing bar for the beam or column can be prevented. As a result, the pile head joint structure of the above configuration (7) can be easily constructed regardless of errors in the pile installation position.

(8) Pile head joining method according to at least one embodiment of the present invention,
A step of preparing a pile head joining device, which is composed of a first concrete, has a cylindrical shape, can be fixed to the main body, and can extend in the axial direction of the main body. A plurality of reinforcing bars, and the main body portion can be installed so as to surround the pile head with a gap that can be filled with a filler, and when the main body portion is positioned with respect to the pile head, A preparation step of preparing a pile head joining device, wherein the variable amount of the installation position of the main body portion in the horizontal direction is configured to be 0.15 times or more the outer diameter of the pile head,
An arrangement step of arranging the main body of the pile head joining device so as to surround the pile head with a gap;
A filling step of filling the gap with a filler;
Placing a second concrete around the plurality of reinforcing bars fixed to the main body, and
Is provided.

  According to said structure (8), when positioning the main-body part with respect to a pile head, the variable amount of the installation position of the main-body part in a horizontal direction becomes 0.15 times or more of the outer diameter of a pile head. Therefore, even if an error occurs in the installation position of the pile, the error can be absorbed and the main body can be arranged at a desired installation position. Therefore, even if an error occurs in the installation position of the pile, the relative positional relationship between the reinforcing bar fixed to the main body part and the reinforcing bar for the beam or the column does not change and is fixed to the main body part. Interference between the reinforcing bar and the reinforcing bar for the beam or column can be prevented. As a result, according to the pile head joining method of the above configuration (8), the pile head joining method can be easily constructed regardless of the error of the pile installation position.

  According to at least one embodiment of the present invention, a pile head joining device that facilitates construction of a pile head joining structure regardless of an error in a pile installation position, a pile head joining structure using the pile head joining device, and A pile head joining method is provided.

It is a figure which shows schematic structure of a structure. It is a longitudinal section showing a pile head junction structure concerning one embodiment of the present invention roughly. FIG. 3 is an enlarged view of a region III in FIG. 2. It is a perspective view showing roughly a pile head joining device concerning one embodiment of the present invention. It is a perspective view showing roughly an example of a plurality of reinforcing bars applied to a pile head joining device. It is a top view which shows roughly the pile head joining apparatus and the pile head of a pile. It is a perspective view which shows schematically the reinforcing bar applicable to the pile head joining apparatus which concerns on other embodiment. It is a schematic longitudinal cross-sectional view of the pile head joining apparatus which concerns on other embodiment. It is a schematic longitudinal cross-sectional view of the pile head joining apparatus which concerns on other embodiment. It is a schematic longitudinal cross-sectional view of the pile head joining apparatus which concerns on other embodiment. It is a schematic longitudinal cross-sectional view of the pile head joining apparatus which concerns on other embodiment. It is a schematic longitudinal cross-sectional view of the pile head joining apparatus which concerns on other embodiment. It is a perspective view which shows schematically the reinforcement member applied to the pile head joining apparatus of FIG. It is a schematic longitudinal cross-section of the pile head joining apparatus which concerns on other embodiment. It is a top view which shows roughly the pile head joining apparatus which concerns on other embodiment, and the pile head of a pile. It is a schematic longitudinal cross-sectional view of the pile head junction structure which concerns on other embodiment. It is a schematic longitudinal cross-sectional view of the pile head junction structure which concerns on other embodiment. It is a schematic plan view of a pile head joining apparatus according to another embodiment. It is a schematic plan view of a pile head joining apparatus according to another embodiment. It is a flowchart which shows the schematic procedure of the pile head joining method which concerns on one Embodiment of this invention. It is a figure for demonstrating the process of the pile head joining method of FIG. It is a figure for demonstrating the process of the pile head joining method of FIG. It is a figure for demonstrating the process of the pile head joining method of FIG. It is a figure for demonstrating the pile head joining method which concerns on other embodiment. It is a figure for demonstrating the pile head joining method which concerns on other embodiment.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

FIG. 1 is a diagram illustrating a schematic configuration of the structure 1. The structure 1 includes a plurality of piles 2, a pile cap 4a joined to each of the pile heads of the plurality of piles 2, a beam 4b connecting the pile caps 4a, and the pile 2 via the pile cap 4a. With a supported superstructure 6. The pile 2, the pile cap 4 a and the beam 4 b constitute a pile foundation structure 8 for supporting the upper structure 6.
The pile foundation structure 8 can be applied to footing instead of the pile cap 4a. Moreover, although the pile foundation structure 8 can support the upper structure 6 directly, you may support it via a seismic isolation apparatus. Correspondingly, the beam 4b may be a foundation beam or a flat beam. Furthermore, the pile 2 may be a cast-in-place pile or a ready-made pile.

FIG. 2 is a diagram for explaining a pile head joint structure 10 according to an embodiment of the present invention, and FIG. 3 is an enlarged view of a region III in FIG. The pile head joint structure 10 includes a pile 2, a pile head joint device 12, a filler 13, and concrete (second concrete) 14.
FIG. 4 is a perspective view schematically showing the pile head joining device 12. As shown in FIG. 4, the pile head joining device 12 includes a main body portion 15 and a plurality of reinforcing bars (main bars) 16 as essential components. The main body 15 is made of concrete (first concrete) and has a cylindrical shape. In the present embodiment, the outer surface of the main body 15 has a rectangular tube shape with a rectangular cross section, and the inner surface has a cylindrical shape. However, the shapes of the outer and inner surfaces of the main body 15 are limited to these. Never happen. On the other hand, the lower end surface and the upper end surface of the main body portion 15 are configured by a horizontal plane. The main body 15 is arranged so that the axial direction of the main body 15 matches the vertical direction.

The plurality of reinforcing bars 16 can be fixed to the main body 15 and can extend from the upper end surface of the main body 15 in the axial direction of the main body 15. The fact that the reinforcing bar 16 can be fixed to the main body part 15 means that the reinforcing bar 16 may be fixed when the main body part 15 is molded or the reinforcing bar 16 may be fixed after the main body part 15 is molded. Alternatively, the reinforcing bar 16 may be removable from the main body 15. In the present embodiment, the lower end side of the reinforcing bar 16 is embedded in the main body portion 15. Here, FIG. 5 is a perspective view schematically showing an example of the plurality of reinforcing bars 16.
For example, the plurality of reinforcing bars 16 are configured by straight deformed bars extending in the vertical direction, and the lower end side of the plurality of reinforcing bars 16 is surrounded by a plurality of auxiliary bars (hoop bars) 18 as additional components. Yes. The auxiliary muscle 18 extends in a horizontal plane, and in the present embodiment, the auxiliary muscle 18 is also embedded in the main body portion 15.

FIG. 6 is a plan view (top view) schematically showing the pile head joining device 12 and the pile head 20 of the pile 2. As shown in FIG. 6, the main body 15 is configured to be able to surround the pile head 20 with a gap S therebetween.
The gap S between the main body 15 and the pile head 20 can be filled with a filler. As shown in FIGS. 2 and 3, the filler 13 is between the main body 15 and the pile head 20. The gap S is filled.
The concrete 14 is placed so as to surround a portion of the reinforcing bar 16 protruding from the main body portion 15 and constitutes a pile cap 4a. In FIG. 2, the reinforcing bar 16 and the reinforcing bar 21 for the pile cap 4a are shown, but the reinforcing bar for the beam 4b or the column connected to the pile cap 4a is omitted.

  Referring again to FIG. 6, the pile head joining device 12 has, as an essential component, a variable amount of the installation position of the main body portion 15 in the horizontal direction when the main body portion 15 is positioned with respect to the pile head 20. The outer diameter d of 20 is 0.15 times or more. For example, when the inner surface of the main body 15 is constituted by a cylindrical inner peripheral surface 15a, the inner diameter D of the main body 15 is configured to be 1.15 times or more the outer diameter d of the pile head 20. ((D−d) ≧ 0.15d)

According to the configuration described above, the pile head joining device 12 is configured such that when the main body 15 is positioned with respect to the pile head 20, the variable amount of the installation position of the main body 15 in the horizontal direction is the outer diameter d of the pile head 20. Therefore, even if an error occurs in the installation position of the pile 2 after construction, it is possible to absorb the error and arrange the main body portion 15 at a desired installation position. it can. Therefore, even if an error occurs in the installation position of the pile 2, it is between the reinforcing bar 16 fixed to the main body 15 and the reinforcing bar (not shown) for the pillar provided on the beam 4b or the pile cap 4a. Therefore, it is possible to prevent interference between the reinforcing bars 16 fixed to the main body portion 15 and the reinforcing bars (not shown) for the beams 4b or the columns. As a result, if the pile head joining apparatus 12 having the above configuration is used, the pile head joining structure 10 can be easily constructed regardless of the error in the installation position of the pile 2.
Moreover, according to the above-described configuration, a sufficiently large gap S is ensured between the pile head 20 and the main body 15, so that the filler 13 can be easily and reliably filled into the gap S. it can.

In some embodiments, when the main body 15 is positioned with respect to the pile head 20, the pile head joining device 12 is configured such that the variable amount of the installation position of the main body 15 in the horizontal direction is the outer diameter d of the pile head 20. It is comprised so that it may become 0.6 times or less.
According to the said structure, the variable amount of the installation position of the main-body part 15 in a horizontal direction is 0.6 times or less of the outer diameter d of the pile head 20, and the pile head 20 and the main-body part 15 are the same. The size of the gap S between them is limited, and the amount of the filler 13 can be limited.

In some embodiments, when the main body 15 is positioned with respect to the pile head 20, the pile head joining device 12 is configured such that the variable amount of the installation position of the main body 15 in the horizontal direction is the outer diameter d of the pile head 20. And a value that is equal to or greater than the sum of the error set during design and the distance required for the grout filling operation. Specifically, the total value of the error set at the time of design and the distance required for the grout filling operation is preferably 100 mm or more.
According to the configuration described above, since the variable amount of the installation position of the main body 15 in the horizontal direction is 100 mm or more, an error in the installation position of the pile 2 can be ensured regardless of the outer diameter d of the pile head 20. And the filler 13 can be filled easily and reliably.

In some embodiments, the filler 13 is composed of a grout such as cement or mortar. And the filler 13 comprised with grout has a compressive strength larger than the concrete which comprises the main-body part 15. FIG. For example, the compressive strength (after curing) of the grout constituting the filler 13 is 60 N / mm ^{2 to} 80 N / mm ² , and the compressive strength of the concrete constituting the main body 15 is 30 N / mm ^{2 to} 40 N / mm ² . is there.

In some embodiments, as shown in FIG. 6, when viewed in the axial direction of the main body 15, the outer edge 15 b of the main body 15 has a rectangular shape, and the plurality of reinforcing bars 16 extend along the outer edge 15 b of the main body 15. Can be arranged. “Arrangeable” means that the plurality of reinforcing bars 16 are arranged along the outer edge 15 b of the main body 15 in a state where the plurality of reinforcing bars 16 are fixed to the main body 15.
According to the said structure, the separation direction of the reinforcement bars 16 which can be fixed to the main-body part 15 and the separation direction of the reinforcement bars for the beam 4b or the column can be made to correspond, and interference of these reinforcement bars can be made more. It can be avoided reliably. For example, the reinforcing bars of the beam 4b extend in a lattice shape in the horizontal direction in the pile cap 4a, and the pitch of the reinforcing bars for the beam 4b or the column is twice the pitch of the reinforcing bars 16.

FIG. 7 is a perspective view schematically showing a reinforcing bar 16 applicable to a pile head joining device 12 according to another embodiment. In some embodiments, as shown in FIG. 7, the plurality of reinforcing bars 16 are U-shaped bars, and the bent part 16 a of the U-shaped line is embedded in the main body 15.
According to the above configuration, the bending portion 16 a of the U-shaped line as the reinforcing bar 16 is embedded in the main body part 15, so that the adhesion force of the reinforcing bar 16 to the main body part 15 can be increased. For this reason, the length of the main-body part 15 in the axial direction of the main-body part 15 can be shortened, and the weight reduction of the pile head joining apparatus 12 can be achieved.

  In some embodiments, when viewed in the axial direction of the main body 15, the outer edge 15 b of the main body 15 has a quadrangular shape, and the bent portion 16 a of each U-shaped streak is the outer edge of the main body 15 as shown in FIG. It extends along 15b.

  FIG. 8 shows a schematic longitudinal section of a pile head joining device 12 according to another embodiment. In some embodiments, as shown in FIG. 8, the reinforcing bar 16 is formed by a U-shaped bar, and when viewed in the axial direction of the main body 15, the bent part 16 a of each U-shaped bar is located outside the main body 15. It extends along the direction orthogonal to the side surface, in other words, along the radial direction of the pile 2.

FIG. 9 shows a schematic longitudinal section of a pile head joining device 12 according to another embodiment. In some embodiments, as shown in FIG. 9, the pile head joining device 12 further includes a fixing member 24 fixed to the reinforcing bar 16.
According to the above configuration, by attaching the fixing member 24 to the reinforcing bar 16, it is possible to increase the adhesion between the reinforcing bar 16 and the pile cap 4a. For this reason, the height of the pile cap 4a can be lowered. The fixing member 24 may have a larger diameter than the reinforcing bar 16. For example, the fixing member 24 has a nut shape, and the reinforcing bar 16 has a screw portion for screwing the fixing member 24.

FIG. 10 shows a schematic longitudinal section of a pile head joining device 12 according to another embodiment. In some embodiments, a coupler 26 is fixed to the main body 15 as shown in FIG. The reinforcing bar 16 can be fixed to the coupler 26, and the reinforcing bar 16 can be fixed to the main body through the coupler 26. For example, the coupler 26 has an internal thread portion, and the reinforcing bar 16 has an external thread portion that can be screwed with the internal thread portion of the coupler 26 at the lower end.
According to the above configuration, the reinforcing bar 16 can be fixed to the main body part 15 via the coupler 26. When the main body part 15 and the reinforcing bar 16 are transported to the construction site, the main body part 15 and the reinforcing bar 16 are separately provided. Can be transported to. For this reason, the pile head joining apparatus 12 can be conveyed easily.

  FIG. 11 shows a schematic longitudinal section of a pile head joining device 12 according to another embodiment. In some embodiments, as shown in FIG. 11, each of the plurality of reinforcing bars 16 further includes a connection member 30 capable of connecting another reinforcing bar 28 in series. The connection member 30 is, for example, a mechanical connection member.

  According to the above configuration, by connecting the other reinforcing bars 28 in series via the connection member 30, the entire length of the reinforcing bars 16 can be extended by the other reinforcing bars 28. As a result, it is possible to secure the adhesive force between the reinforcing bar 16 and the pile cap 4a while shortening the reinforcing bar 16 that can be fixed to the main body 15. On the other hand, when transporting the main body 15 and the reinforcing bar 16 fixed to the main body 15 to the site, the reinforcing bar 16 fixed to the main body 15 may be short, so the main body 15 is easily transported. be able to.

FIG. 12 shows a schematic longitudinal section of a pile head joining device 12 according to another embodiment. In some embodiments, as shown in FIG. 12, the pile head joining device 12 further includes a reinforcing member 32. FIG. 13 is a perspective view schematically showing the reinforcing member 32, and the reinforcing member 32 includes a plurality of reinforcing bars combined in a hat shape.
A part of the reinforcing member 32 is embedded in the main body 15 and is transported and installed together with the main body 15. In this case, when the main body 15 is positioned with respect to the pile head 20, a variable amount of the installation position of the main body 15 in the horizontal direction is defined by the reinforcing member 32. Accordingly, when the main body 15 is positioned with respect to the pile head 20, the reinforcing member 32 has a variable amount of the installation position of the main body 15 in the horizontal direction being 0.15 times or more the outer diameter d of the pile head 20. It is comprised so that it may become.
According to the said structure, the intensity | strength of the pile head joining structure 10 using the pile head joining apparatus 12 can be made higher by the hat-shaped reinforcement member 32. FIG.

FIG. 14 shows a schematic longitudinal section of a pile head joining device 12 according to another embodiment. In some embodiments, as shown in FIG. 14, a part of the reinforcing bar 16 is located inside the main body 15. In this case, when positioning the main body 15 with respect to the pile head 20, a variable amount of the installation position of the main body 15 in the horizontal direction is defined by a part of the reinforcing bars 16 located inside the main body 15. Accordingly, a part of the reinforcing bars 16 located inside the main body 15 has a variable amount of the installation position of the main body 15 in the horizontal direction when the main body 15 is positioned with respect to the pile head 20. The outer diameter d is 0.15 times or more.
According to the said structure, since the whole lower end part of the reinforcing bar 16 is not embed | buried under the main-body part 15, size reduction of the main-body part 15 can be achieved, and the weight reduction of the pile head joining apparatus 12 can be achieved by this.

In some embodiments, as shown in FIGS. 2 and 3, the pile head joint structure 10 further includes a discarded concrete 34, a height adjusting member 36, and a seal member 38.
The discarded concrete 34 is arranged around the pile head 20 of the pile 2. The height adjusting member 36 is disposed between the discarded concrete 34 and the main body 15 in order to install the main body 15 horizontally. In this case, a gap S is formed between the discarded concrete 34 and the main body 15, and the filler 13 is further filled in the gap S.

  According to the said structure, the axial direction of the main-body part 15 can be match | combined with a perpendicular direction by installing the main-body part 15 via the height adjustment member 36 on the discarded concrete 34. FIG. On the other hand, by further filling the gap 13 between the discarded concrete 34 and the main body 15 with the filler 13, it is possible to prevent the main body 15 from being inclined after the filler 13 is filled. In addition, it can prevent that the filler 13 leaks from a clearance gap by arrange | positioning the sealing member 38 so that the clearance gap between the main-body part 15 and the discarded concrete 34 may be covered from the outer side.

  FIG.15 and FIG.16 is a figure for demonstrating the pile head junction structure 10 which concerns on other embodiment. As shown in FIGS. 15 and 16, the pile head joining device 12 is fixed to the pile head 20 of the pile 2 in addition to the reinforcing bars (first reinforcing bars) 16 that can be fixed to the main body 15. 2 further includes a plurality of reinforcing bars (second reinforcing bars) 40 extending in the axial direction. For example, the pile 2 is a concrete pile with an outer shell steel pipe, and the reinforcing bar 40 can be directly welded to the outer peripheral surface of the pile head 20.

  According to the said structure, the joint strength between the pile head 20 and the pile cap 4a is ensured by the reinforcing bar 16 fixed to the main-body part 15 and the reinforcing bar 40 fixed to the pile head 20. Can do. On the other hand, in the above configuration, the reinforcing bar 16 fixed to the main body 15 is provided, and the reinforcing bar 40 fixed to the pile head 20 is compared with the case where there is no reinforcing bar 16 fixed to the main body 15. The number can be reduced. Therefore, it is possible to prevent interference between the reinforcing bar 16 fixed to the main body 15 and the reinforcing bar for the beam 4b or the column, and the reinforcing bar 40 fixed to the pile head 20 and the beam 4b or the column. It is possible to prevent interference with the reinforcing bars.

In some embodiments, the reinforcing bars 16 and the reinforcing bars 40 are fixed such that the arrangement interval P1 of the reinforcing bars 16 and the arrangement interval P2 of the reinforcing bars 40 are equal.
According to the above configuration, since the arrangement interval P1 of the reinforcing bars 16 and the arrangement interval P2 of the reinforcing bars 40 are equal, interference between the reinforcing bars 16 fixed to the main body portion 15 and the reinforcing bars for the beam 4b or the column is prevented. While being able to prevent, interference with the reinforcing bar 40 fixed to the pile head 20 and the reinforcing bar for the beam 4b or the column can be prevented.

  FIG. 17 is a view for explaining a pile head joint structure 10 according to another embodiment. As shown in FIG. 17, the reinforcing bar 40 can be fixed to the pile head 20 via a coupler 42.

  FIG. 18 is a view for explaining a pile head joining device 12 according to another embodiment. In some embodiments, as shown in FIG. 18, the outer edge 15 b of the main body 15 has a rectangular shape when viewed in the axial direction of the main body 15, and the plurality of reinforcing bars 16 extend along the outer edge 15 b of the main body 15. Can be arranged. And the arrangement interval P3 of the reinforcing bars 16 at the corners of the main body 15 is smaller than the arrangement interval P1 of the reinforcing bars 16 at the sides of the main body 15.

According to the above configuration, the reinforcing bars 16 can be densely arranged at the corners of the main body 15,
The joint between the pile head joining device 12 and the pile cap 4a can be strengthened. On the other hand, the reinforcing bars for the beam 4b or the column are not arranged above the corners of the main body part 15 or the density is low even if arranged, so the reinforcing bars 16 fixed to the corners of the main body part 15 and Interference with the reinforcing bars for the beam 4b or column can be avoided.

FIG. 19 is a diagram for explaining a pile head joining device 12 according to another embodiment. In some embodiments, as shown in FIG. 19, when viewed in the axial direction of the main body portion 15, some reinforcing bars 16 are arranged at the center of each side of the rectangular virtual line L, and other reinforcements are provided. The streak 16 is disposed inside the corner of the imaginary line L.
According to the said structure, the dispersion | variation in the distance between the reinforcing bar 16 and the pile head 20 can be made small, and force transmission between the pile head joining apparatus 12 and the pile head 20 is performed with good balance. be able to.

In some embodiments, the outer surface of the main body 15 has an octagonal shape when viewed in the axial direction of the main body 15. This octagonal shape is a shape obtained by cutting off the corners of a square shape.
According to the above configuration, when the main body portion 15 is octagonal when viewed in the axial direction of the main body portion 15, the main body portion 15 can be lighter than when the main body portion 15 has a quadrangular shape. As a result, the pile head joining device 12 can be reduced in weight.

  In some embodiments, the outer peripheral surface of the pile head 20 is provided with a detent for preventing the relative displacement of the filler 13 in the vertical direction. For example, as shown in FIG. 3, the slip stopper includes a protrusion 46 fixed to the outer peripheral surface of the pile head 20 and the inner peripheral surface 15 a of the main body 15, a stud bolt, and the like.

In some embodiments, as shown in FIG. 2, the pile 2 is a hollow ready-made pile, and the hollow ready-made pile is filled with a soil cement 48 except for a part on the upper side.
In some embodiments, as shown in FIG. 2, the pile 2 is a hollow ready-made pile, and a dowel bar 50 configured by a reinforcing bar so as to protrude from the pile head 20 inside the pile head 20. Is placed. Due to the dowel bars 50, the pile head joint structure 10 becomes stronger.

20 is a flowchart showing a schematic procedure of a construction method (pile head joining method) of the pile head joint structure 10, and FIGS. 21, 22 and 23 are diagrams for explaining the steps in FIG. It is.
As shown in FIG. 20, the pile head joining method includes a preparation step S10, an arrangement step S12, a filling step S14, and a placing step S16.
The preparation step S <b> 10 is a step of preparing the pile head joining device 12 at the construction site of the pile 2. In order to prepare the pile head joining device 12, in addition to manufacturing the pile head joining device 12 on the spot, the pile head joining device 12 previously produced in another place such as a factory is used at the construction site of the pile 2. Carrying in is also included.

  In the placement step S12, as shown in FIG. 21, the pile head joining device 12 is placed so that the main body 15 of the pile head joining device 12 surrounds the pile head 20 with a gap S therebetween. At this time, the height adjusting member 36 is disposed between the discarded concrete 34 and the main body 15 as necessary, and the seal member 38 is disposed so as to cover these gaps from the outside.

  In the filling step S <b> 14, as shown in FIG. 22, the filler 13 is filled in the gap S between the main body 15 and the pile head 20. The main body 15 is fixed to the pile head 20 by the hardening of the filler 13.

  In the placing step S <b> 16, concrete (second concrete) 14 is placed around the plurality of reinforcing bars 16 fixed to the main body portion 15. Before placing the concrete 14, as shown in FIG. 23, the reinforcing bars 21 of the pile cap 4a are arranged, and reinforcing bars (not shown) for the beams 4b or the columns are arranged. Further, before the concrete 14 is placed, a mold 52 for forming the pile cap 4a is assembled, and the dowel bars 50 are arranged as necessary. When the concrete 14 placed in the placement step S16 is cured, the pile cap 4a is formed as shown in FIG.

  FIG.24 and FIG.25 is a figure for demonstrating the pile head joining method which concerns on other embodiment. When the height of the main body 15 is low, as shown in FIG. 24, the mold 54 is disposed along the outer surface of the main body 15 so as to exceed the upper end of the main body 15. The formwork 56 is disposed between them 54. The mold 54 also has a function as a seal member.

Then, as shown in FIG. 25, the pile cap 4a can be formed by filling the gap S and the molds 52, 54 and 56 with the concrete 14. In this case, since the height of the main body 15 is low, a part of the concrete 14 surrounds the outer peripheral surface of the pile head 20.
According to the pile head joining method according to this embodiment, the gap 14 between the main body 15 and the pile head 20 is filled with the concrete 14 and also filled into the molds 52, 54 and 56. Therefore, it is possible to save labor for manufacturing, managing, and constructing the filler 13.

  Finally, the present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

DESCRIPTION OF SYMBOLS 1 Structure 2 Pile 4a Pile cap 4b Beam 6 Superstructure 8 Pile foundation structure 10 Pile head joint structure 12 Pile head joint device 13 Filler 14 Concrete (2nd concrete)
15 Body 16 Reinforcing bar (first reinforcing bar)
18 Auxiliary Reinforcement 20 Pile Head 21 Reinforcing Bar 24 Fixing Member 26 Coupler 28 Other Reinforcing Bar 30 Connecting Member 32 Reinforcing Member 34 Abandoned Concrete 36 Height Adjusting Member 38 Sealing Member 40 Reinforcing Bar (Second Reinforcing Bar)
42 Coupler 44 Expanding ring 46 Protrusion 48 Soil cement 50 Dowel bar 52 Form 54 Form 58 56 Form

Claims (8)

A main body made of concrete and having a cylindrical shape;
A plurality of reinforcing bars capable of being fixed to the main body and extending in the axial direction of the main body,
The main body can be installed so as to surround the pile head with a gap that can be filled with a filler,
When positioning the main body with respect to the pile head, the variable amount of the installation position of the main body in the horizontal direction is configured to be at least 0.15 times the outer diameter of the pile head. Pile head joining device characterized. When positioning the main body with respect to the pile head, the variable amount of the installation position of the main body in the horizontal direction is configured to be 0.15 times or more and 100 mm or more of the outer diameter of the pile head. The pile head joining apparatus according to claim 1, wherein Seeing in the axial direction of the main body, the outer edge of the main body has a rectangular shape,
The pile head joining apparatus according to claim 1, wherein the plurality of reinforcing bars can be arranged along an outer edge of the main body. The plurality of reinforcing bars are constituted by U-shaped bars,
The pile head joining apparatus according to any one of claims 1 to 3, wherein the bent portion of the U-shaped line is embedded in the main body portion. A coupler is fixed to the main body,
The pile head joining device according to any one of claims 1 to 4, wherein the reinforcing bar is fixable to the main body through the coupler. It further comprises a reinforcing member constituted by a plurality of reinforcing bars combined in a hat shape,
The pile head joining apparatus according to any one of claims 1 to 5, wherein at least a part of the reinforcing member is embedded in the main body. Piles,
A pile head joining device comprising: a main body portion made of first concrete and having a cylindrical shape; and a plurality of reinforcing bars fixed to the main body portion and extending in the axial direction of the main body portion. The main body portion can be installed so as to surround the pile head portion with a gap that can be filled with a filler, and the main body portion in the horizontal direction when positioning the main body portion with respect to the pile head portion A pile head joining device configured such that the variable amount of the installation position of the pile head is 0.15 times or more the outer diameter of the pile head;
A filler filled in the gap;
A second concrete placed so as to surround the reinforcing bar;
A pile head joint structure comprising: A step of preparing a pile head joining device, which is composed of a first concrete, has a cylindrical shape, can be fixed to the main body, and can extend in the axial direction of the main body. A plurality of reinforcing bars, and the main body portion can be installed so as to surround the pile head with a gap that can be filled with a filler, and when the main body portion is positioned with respect to the pile head, A preparation step of preparing a pile head joining device, wherein the variable amount of the installation position of the main body portion in the horizontal direction is configured to be 0.15 times or more the outer diameter of the pile head,
An arrangement step of arranging the main body of the pile head joining device so as to surround the pile head with a gap;
A filling step of filling the gap with a filler;
Placing a second concrete around the plurality of reinforcing bars fixed to the main body, and
A pile head joining method comprising:

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