JP5503569B2 - Joint structure of pile and foundation structure - Google Patents

Description

  The present invention relates to a joint structure between a pile and a foundation structure, and relates to a technique for reducing the depth of a foundation structure embedded around a pile head.

  Conventionally, as a foundation using a pile, a footing having a larger cross section than that of the foundation beam is provided in the foundation beam, and the reinforcing bar (anchor bar) embedded in the pile head and welded to the outer peripheral surface of the pile head is used as the footing. An RC structure that is bonded by fixing is known. According to this joining method, it is possible to bear a part of the shearing force and bending moment at the embedded part of the pile head, that is, the part in contact with the side surface of the pile head, so the number of reinforcing bars welded to the pile head is reduced. Can do.

  On the other hand, in recent years, an outer steel pipe having a diameter larger than that of the pile is arranged around the head of the pile, and the foundation beam is joined by filling the concrete with a reinforcing bar between the pile and the outer steel pipe. An enlarged member consisting of a structure (see Patent Document 1) and a diaphragm having a diameter larger than that of the pile and a diaphragm provided at the lower end of the outer steel pipe so as to close the gap between the pile head is joined around the pile head. A joint structure in which a filler is filled in the gap between the outer steel pipe and the pile head and a reinforcing bar is joined to the outer peripheral surface of the outer steel pipe so that the reinforcing bar is embedded in the foundation structure (see Patent Document 2). ) Etc. are also proposed.

Japanese Patent Laid-Open No. 11-13139 JP 2006-104886 A

  However, in the conventional RC joint structure, when the design stress increases, the required number of reinforcing bars joined to the pile head increases. Since the reinforcing bars are arranged in a circle in plan view, when the number of reinforcing bars increases, the main bars of the foundation beam easily interfere with the reinforcing bars, and it is difficult to arrange the bars in terms of design and construction. Therefore, the conventional RC joint structure cannot be applied as it is to a pile having a large design stress. Here, it is conceivable to increase the stress load in the embedded reinforcement portion of the pile head, but in this case, it is necessary to embed the pile head deeper in the footing (construct the footing so as to wrap the pile head deeper). Therefore, the bottom position of the foundation structure is lowered. For this reason, the amount of excavated soil increases, and temporary construction such as mountain retaining is required, which leads to an increase in construction cost.

  On the other hand, in the inventions of Patent Documents 1 and 2, the reaction force against the bending moment can be increased without increasing the bottom position of the foundation structure by the expanded diameter portion by the outer steel pipe, but the cost of the steel frame increases because the amount of steel frame used increases. The rise of is inevitable.

  The present invention has been made in view of such a background, and a pile and a foundation structure capable of increasing the bottom position of the foundation structure without increasing the cost and increasing the stress imposed on the side surface of the pile. It aims at providing the joining structure with a body.

  In order to solve the above problems, the present invention is a joint structure between a pile (1) and a foundation structure (2), and the foundation structure (2) is at least one pile circumferential reinforcing bar (11). The main body (5) constructed above the pile head surface (1s) and the main body portion below the pile head surface so as to wrap the pile head (1a). The pile circumference reinforcing part (6), the pile circumference reinforcing bar is arranged on one side of the pile in plan view, and extends horizontally in the lower part of the pile circumference reinforcing part (11a) A pair of diagonal streaks (11b) extending diagonally upward from both ends of the horizontal streak toward the other side of the pile so as to surround the pile in a plan view in cooperation with the horizontal streaks, A pair of vertical stripes (11c) extending upward from the upper end of the diagonal stripes is provided.

  In a joint structure in which a pile head is embedded in a conventional footing, when a force (shear or bending) that generates compressive stress is applied to one side of the footing, this force is applied from the site where the compressive stress is generated. It is transmitted horizontally in the direction opposite to the compression direction via the lower end bars of the footings arranged horizontally, and further transmitted vertically to the upper part having high rigidity through the reinforcing bars of the footings arranged vertically. For this reason, the force transmission path is long and the deformation amount of the pile peripheral reinforcement portion is large, so that the portion where the compressive stress is generated, particularly, the lower end portion on the moment acting direction side when the moment acts is easily broken.

  On the other hand, in the present invention, when a force that generates a compressive stress is applied to the portion where the horizontal reinforcement in the pile circumferential reinforcing portion is provided, this force is provided at a position higher than the horizontal reinforcement via the oblique reinforcement. It is directly transmitted to the peripheral part of the vertical muscle provided in the part with high rigidity compared with the vertical reinforcement provided, that is, the lower part of the periphery of the pile circumference. Therefore, the force transmission path is shortened and the deformation amount of the pile circumferential reinforcing portion is reduced, so that the rigidity against the horizontal force of the portion where the horizontal streaks are provided can be increased and the breakage is hardly caused. Thereby, the required number of reinforcing bars joined to the pile head can be reduced, and the bottom position of the foundation structure can be shallowed.

  Moreover, according to one aspect of the present invention, the pile circumferential reinforcing bar can be configured such that the connection portion between the diagonal line and the vertical line is positioned at substantially the same height as the pile head surface. For a force that generates a horizontal compressive stress at a site where a horizontal bar is provided, the pile is on the side opposite to the direction of the force applied to the pile in plan view, that is, on the side where the vertical bar is provided. By transmitting the force to the portion of the mass concrete that is higher than the head surface, the rigidity of the portion in contact with the pile side surface of the foundation structure can be effectively increased. According to this configuration, since the force applied to the part provided with the horizontal stripes can be transmitted to the optimum part for improving the rigidity at the extreme end distance, the rigidity of the part provided with the horizontal stripes is effectively reduced. Can be increased.

  Further, according to one aspect of the present invention, the foundation structure is bonded to the outer peripheral surface of the pile, and the pile upper reinforcing bar (16) extending upward from the pile head surface and extending into the body portion is provided. Furthermore, it can be set as the structure which has. According to this configuration, the foundation structure can be effectively countered against the shearing force and the bending moment by the pile head surface in addition to the increase in allowable stress due to the pile peripheral reinforcement. The allowable stress of the entire structure can be further increased.

  Moreover, according to one aspect of the present invention, the foundation structure has a plurality of pile circumferential reinforcing bars, and the plurality of pile circumferential reinforcing bars are arranged such that the horizontal bars are arranged on one side of the pile in plan view. 1 pile circumference reinforcement (11) and the horizontal reinforcement can be set as the structure containing the 2nd pile circumference reinforcement (12) arrange | positioned at the other side of the pile by planar view. According to this configuration, the allowable stress of the pile circumferential reinforcing portion can be effectively increased not only for the shear stress or bending stress in one direction but also for the shear stress or bending stress in the opposite direction.

  Moreover, according to one aspect of the present invention, the foundation structure has a plurality of pile circumferential reinforcing bars, and the plurality of pile circumferential reinforcing bars are arranged such that the horizontal bars are arranged on one side of the pile in plan view. A structure including one pile circumference reinforcing bar (11) and a third pile circumference reinforcing bar (13) whose horizontal bars extend in a direction orthogonal to the horizontal bars of the first pile circumferential reinforcing bar in plan view; can do. According to this configuration, the allowable stress of the pile circumferential reinforcing portion can be effectively increased not only with the shear stress or bending stress in one direction but also with the shear stress or bending stress in the direction orthogonal thereto.

  As described above, according to the present invention, the joint structure between the pile and the foundation structure that can shallow the bottom position of the foundation structure without increasing the cost and can increase the bending moment that the side surface of the pile head bears. Can be provided.

It is a top view of the junction part of the pile concerning this invention, and a foundation structure. It is sectional drawing which follows the II-II line | wire in FIG. It is a top view which shows the main reinforcement of the junction part of the pile shown in FIG. 1, and a foundation structure. It is sectional drawing which follows the IV-IV line in FIG. It is the perspective view which looked at the reinforcing bar shown in FIG. It is a schematic sectional drawing of the foundation structure model which has a reinforcing bar shown in FIG. It is a see-through | perspective side view for demonstrating an effect | action of the foundation structure model shown in FIG. FIG. 7 is a perspective plan view for explaining the operation of the foundation structure model shown in FIG. 6. It is typical sectional drawing for demonstrating an effect | action of the foundation structure model shown in FIG.

  Hereinafter, an embodiment of a joint structure between a pile 1 and a foundation structure 2 according to the present invention will be described with reference to the drawings. In addition, when showing a direction, it is based on the east-west north-south and up-down direction shown in the figure.

  As shown in FIG. 1 and FIG. 2, the joint structure according to the present invention is a foundation structure 2 for supporting an upper structure such as a building (not shown) with respect to a pile 1 built (embedded) in the ground G. Are joined. Here, as the pile 1, an SC pile in which high-strength concrete is formed into a cylindrical shape by centrifugal compaction in a hollow portion of a steel pipe having a circular cross section is used. The foundation structure 2 has a substantially rectangular parallelepiped shape, is formed with a footing 3 that supports the pillar 8 that forms the lower end of the upper structure, and is formed in a smaller cross section than the footing 3, and is orthogonally arranged in the east-west direction and the north-south direction. It is comprised from the foundation beam 4 which connects the arrange | positioned footings 3 mutually.

  The pile 1 has a head S (hereinafter referred to as a pile head 1a) on the ground S (here, the lower surface of the lowest floor slab 9 connected to the upper part of the foundation beam 4 is referred to as the ground S). It is constructed vertically in the ground G so as to be positioned below the ground.

  The footing 3 is made of reinforced concrete, and is higher than the pile head surface 1s so as to wrap up the main body portion 5 constructed above the upper end surface of the pile 1 (hereinafter referred to as a pile head surface 1s) and the pile head 1a. It has the pile periphery reinforcement part 6 constructed | assembled integrally with the main-body part 5 below. The footing 3 is constructed by assembling a reinforcing bar and a formwork together with the foundation beam 4 and placing concrete on the discarded concrete 7 cast after excavating the ground G as indicated by a two-dot chain line. The

  As shown in FIGS. 3 to 5, the reinforcing bars arranged in the footing 3 include the first to fourth pile circumferential reinforcing bars 11 to 14 arranged around the pile 1 in a plan view and the footing 3 in a plan view. And a plurality of pile peripheral vertical reinforcing bars 15 (here, four in the corner and one each in the middle) arranged at substantially equal intervals between the corners and the outer periphery of the pile 1 A plurality (eight in this case) of pile upper reinforcing bars 16 arranged along the plane are included. In addition, in FIG. 5, illustration of the pile upper reinforcement 16 is abbreviate | omitted so that it may not become complicated.

  The 1st pile circumference reinforcement 11 is arrange | positioned on the east side of the pile 1, and the horizontal reinforcement 11a extended in the north-south direction substantially horizontally in the lower part of the pile circumference reinforcement part 6 cooperates with the horizontal reinforcement 11a by planar view. A pair of diagonal streaks 11b extending diagonally upward from both ends of the horizontal streaks 11a so as to surround the pile 1 in a U shape, and extending upward from the upper ends of the pair of slant streaks 11b, respectively. It has a pair of vertical streaks 11c.

  The 2nd-4th pile circumference reinforcement bars 12-14 are exhibiting the same shape as the 1st pile circumference reinforcement bars 11, and are 180 degrees respectively clockwise in plane view to the 1st pile circumference reinforcement bars 11. They are arranged in different orientations of 270 degrees and 90 degrees. That is, the 2nd pile circumference reinforcement 12 is arrange | positioned so that the horizontal reinforcement 12a may be arrange | positioned in the west side of the pile 1, and may extend in the north-south direction substantially horizontally in the lower part of the pile circumference reinforcement part 6, 3rd pile circumference The reinforcing bar 13 is arranged so that the horizontal bar 13a is arranged on the north side of the pile 1 and extends substantially horizontally in the east-west direction at the lower part of the pile peripheral reinforcing part 6, and the fourth pile peripheral reinforcing bar 14 is The horizontal streaks 14a are arranged on the south side of the pile 1 and are arranged so as to extend in the east-west direction substantially horizontally at the lower part of the pile circumferential reinforcing portion 6.

  Here, the first to fourth pile circumferential reinforcing bars 11 to 14 are each formed by bending one reinforcing bar, but each of the reinforcing bars is formed to have the above-described configuration by lap connection or the like. May be.

  These 1st-4th pile circumference reinforcement bars 11-14 are the height in which the connection part of slant bars 11b, 12b, 13b, 14b and vertical bars 11c, 12c, 13c, 14c is substantially the same as pile head surface 1s, That is, it is arranged in the vicinity of the connecting portion between the main body portion 5 and the pile circumference reinforcing portion 6.

  The pile periphery vertical reinforcing bar 15 is bent into a J shape in a side view so as to form a hook at the lower end. Here, the corners are diagonal lines of the first to fourth pile peripheral reinforcing bars 11 to 14, respectively. 11b, 12b, 13b, 14b, inside the intersection, the middle one is inside or outside the intersection of the oblique bars 11b, 12b, 13b, 14b of the first to fourth pile circumference reinforcing bars 11-14, respectively. It is arranged to extend vertically with the hooks down.

  Here, the pile upper reinforcing bars 16 are arranged at equal intervals (45 ° pitch) on the outer peripheral surface of the pile 1, the lower side is welded to the outer peripheral surface of the pile 1, and the upper side extends upward from the pile head surface 1 s. It extends out and extends vertically inside the main body 5.

  Next, the effect | action by the joining structure of the pile 1 and the foundation structure 2 which were comprised in this way is demonstrated with reference to the model shown in FIGS. 6, when vertical load N, horizontal load (shearing force Q) or moment M is applied to footing 3 from column 8 (see FIG. 2) of the upper structure, footing 3 and pile 1 is the same as when a vertical load N, shear force Q, or moment M in the direction indicated by the arrow shown in the lower part of the figure is applied to the pile 1. Therefore, in the following, the function and effect will be described based on the situation in which force is applied from the pile 1 side to the fixed footing 3 instead of from the footing 3 side.

  Here, the action when the moment M, which tends to exceed the allowable stress as compared with the shear when the number of the pile upper reinforcing bars 16 is applied, is applied to the pile 1 as shown by the arrows in FIG. 7 will be described. . Here, the action direction in the horizontal plane of the moment M with respect to the pile 1 is set to the front, and when the moment M is applied to the pile 1 as shown in FIGS. The part located in the pile circumference reinforcement front part 21 is called the pile circumference reinforcement front part 21, and the part of the pile circumference reinforcement part 6 that extends backward from the pile circumference reinforcement front part 21 is called the pile circumference reinforcement side part 22. The part where the pile 1 acts directly on the front side (pile circumference reinforcing front part 21) is referred to as a front pile supporting pressure transmission part 23, and the part where the pile 1 acts directly on the rear side of the pile circumference reinforcing part 6 is called. The virtual pile-shaped part located on the pile 1 along the pile upper reinforcing bar 16 in the main body part 5 will be referred to as a rear pile support transmission part 24 and will be described as a virtual RC cylinder 25.

  When a force as indicated by an arrow is applied to the pile 1, the bearing pressure is applied to the front side pile bearing transmission portion 23, the rear side pile bearing transmission portion 24, and the lower front portion of the virtual RC cylinder 25 that form a contact surface with the pile 1. Works.

  The main body 5 directly bears a stress on the support pressure acting on the lower front portion of the virtual RC cylinder 25. When a supporting force exceeding the vertical load N is applied to the lower front part of the virtual RC cylinder 25, the tensile force transmitted to the virtual RC cylinder 25 via the pile upper reinforcing bar 16 arranged on the rear side (right side in the figure) A part of the moment M is transmitted to the main body 5 by canceling the load and the supporting pressure.

  On the other hand, most of the support pressure acting on the front pile support transmission portion 23 becomes a bending load on the pile peripheral reinforcement front portion 21 reinforced by the horizontal reinforcement 11 a of the first pile peripheral reinforcement 11, and the pile peripheral reinforcement front portion. 21 is transmitted to both end sides. The bending load transmitted to both ends of the pile circumferential reinforcing front portion 21 then becomes a tensile load on the pile circumferential reinforcing side surface portion 22 reinforced by the oblique reinforcement 11b of the first pile circumferential reinforcing bar 11, and the pile circumferential reinforcement is performed. It is transmitted to the rear end side and the upper side of the side surface portion 22, and is transmitted as a compressive load to the main body portion 5 that is on the rear side with respect to the pile 1 and is a mass concrete portion.

  In the rear pile support transmission portion 24, a support pressure opposite to the support pressure acting on the front pile support transmission portion 23 acts, and this support pressure is directly transmitted to the main body portion 5 directly above. Is done. In this way, a part m of the moment M is transmitted to the main body part 5 through the pile circumference reinforcing part 6.

  And, by the sum of a part m of the moment M that can be transmitted to the main body part 5 via the pile circumference reinforcing part 6 and a part of the moment M that can be transmitted to the main body part 5 via the virtual RC cylinder 25, the foundation The allowable stress for the moment of the structure 2 is determined.

  In addition, the pile upper reinforcing bar 16 and the pile peripheral vertical reinforcing bar 15 also serve to transmit the shearing force Q generated in the pile 1 to the footing 3. A part of the shearing force Q generated in the pile 1 is transmitted to the footing 3 by the pile upper reinforcing bar 16 and the pile circumferential vertical reinforcing bar 15, and the remainder is the first and second pile circumferential reinforcing bars 11, It is transmitted to the footing 3 by 12 oblique muscles 11b and 12b. Moreover, the four pile circumference | surroundings vertical reinforcement 15 arrange | positioned at the corner of the footing 3 is a connection part of the horizontal reinforcement 11a-14a of the 1st-4th pile circumference reinforcement 11-11, and the diagonal reinforcement 11b-14b. By restraining, the tensile load transmission effect by the oblique muscles 11b to 14b is prevented from being lowered.

  The effect of the present invention in which such load transmission is performed will be described with reference to the schematic diagram of FIG. 9 shown in comparison with the conventional example. FIG. 9A shows a joining structure according to the present invention, and FIG. 9B shows a conventional joining structure. As shown in FIG. 9 (A), in the joint structure according to the present invention, the tensile load that transmits the pile circumferential reinforcing side surface portion 22 of the pile circumferential reinforcing portion 6 directly reaches the main body portion 5 obliquely. Therefore, the load transmission path is the farthest distance, and the portions corresponding to the front pile support pressure transmission portion 23 and the rear pile support pressure transmission portion 24 on which the support pressure acts are linearly connected and restrained. Therefore, the relative displacement amount between the front pile support transmission portion 23 and the rear pile support transmission portion 24 is minimized.

  On the other hand, in the conventional joint structure in which reinforcing bars (not shown) are arranged horizontally and vertically on the pile circumferential reinforcing portion 56, as shown in FIG. 9B, the tensile load that transmits the pile circumferential reinforcing side surface portion 22 is First, it is transmitted horizontally along the horizontal reinforcing bar to the rear end side, and then transmitted vertically along the vertical reinforcing bar to reach the main body 5. Therefore, since the load transmission path is longer than that of the present invention and the transmission path is refracted at right angles, the rear portion of the pile circumferential reinforcing portion 56 can be deformed in cross section. And the relative displacement amount with the rear side pile bearing transmission part 24 becomes large. That is, a part m ′ of the moment M that can be borne by the pile circumference reinforcing part 56 is smaller than a part m of the moment M that can be borne by the pile circumference reinforcing part 6 of the present invention.

  Thus, if the dimension of the pile periphery reinforcement part 6 is the same as the joining structure of the pile 1 and the foundation structure 2 which concerns on this invention, the site | part in which the horizontal reinforcement 11a of the 1st pile periphery reinforcement 11 was provided. It is possible to increase the rigidity with respect to the horizontal force and make it difficult to cause breakage. In other words, it is possible to reduce the number of pile upper reinforcing bars 16 to be joined to the pile head 1a and to shallow the bottom position of the foundation structure 2. Thereby, the reinforcement arrangement and construction of the main reinforcement of the foundation beam 4 can be facilitated, the amount of use of concrete and steel materials and the amount of excavation can be reduced, and the cost can be reduced. Moreover, since the deformation | transformation of the pile periphery reinforcement part 56 can be made small, the head fixing degree of the pile 1 can be enlarged.

  Moreover, since the 1st pile periphery reinforcing bar 11 is arranged so that the connection part of the diagonal reinforcement 11b and the vertical reinforcement 11c may be located in the substantially same height as the pile head surface 1s, it is with respect to the pile 1 by planar view. Therefore, it can be transmitted to the portion of the mass concrete (main body portion 5) located on the side opposite to the direction in which the force is applied, that is, on the side where the vertical streaks 11c are provided and higher than the pile head surface 1s. Therefore, the rigidity of the part (front pile support transmission part 23) provided with the horizontal bars 11a is effectively enhanced.

  And, as shown in FIGS. 3 to 5, the first to fourth pile circumferential reinforcing bars 11 to 14 are arranged in four directions by being different from each other by 90 degrees in plan view. It is possible to effectively increase the allowable stress of the pile periphery reinforcing portion 6 not only with respect to the stress but also with respect to shear stress or bending stress in the opposite direction and perpendicular direction.

  Moreover, in addition to the increase in the allowable stress due to the pile peripheral reinforcing portion 6, the moment caused by the virtual RC cylinder 25 can be obtained by using the pile upper reinforcement 16 in a range that does not interfere with the reinforcement of the main reinforcement of the foundation beam 4. The load and the shearing force load on the pile head surface 1s can be further increased, and the allowable stress of the foundation structure 2 as a whole can be further increased.

  This is the end of the description of the specific embodiment. However, the present invention is not limited to the above embodiment, and the specific shape and arrangement of each member can be appropriately changed without departing from the spirit of the present invention. It is. For example, in the above-described embodiment, the foundation structure 2 is configured to have the footing 3 and the foundation beam 4, but the foundation structure 2 may not have the foundation beam 4. Even if it is such a form, it is possible to make the height dimension of the pile periphery reinforcement part 6 of the footing 3 small. Moreover, in the said embodiment, although the horizontal reinforcement, the inclination reinforcement, and the vertical reinforcement of a pile circumference reinforcement are made into the straight shape, respectively, and it is connected by the bending process part, the whole horizontal reinforcement, a part of inclination, etc. may be curved. The end side of the horizontal stripe may be inclined and smoothly connected to the inclined stripe.

  Moreover, in the said embodiment, although the one 1st pile periphery reinforcement bar | burr 11 which has the horizontal reinforcement 11a extended in the north-south direction on the east side of the pile 1, for example is arrange | positioned, the 1st pile circumference reinforcement bar | burr 11 is plural Alternatively, it may be arranged or a plurality of only the oblique stripes 11b may be arranged. In this way, by changing the bar arrangement amount of the oblique reinforcement 11b, the share ratio between the moment that stress is borne by the joint surface with the pile head surface 1s of the main body 5 and the moment that stress is borne by the pile peripheral reinforcement portion 6 is changed. Can be adjusted. Furthermore, it is also possible to use a twisted wire, a steel frame, a steel plate, or the like instead of a normal reinforcing bar as the diagonal bars.

  On the other hand, the joint structure of the pile 1 and the foundation structure 2 according to the present invention shown in the above embodiment does not necessarily require all elements, and is appropriately selected as long as it does not depart from the gist of the present invention. It is possible. For example, in the said embodiment, although the footing 3 contains the pile circumference vertical reinforcement 15 and the pile upper reinforcement 16 other than the 1st-4th pile circumference reinforcement 11, the one or both of these is included. It is also possible to adopt a form that does not include. Furthermore, if the footing 3 includes at least one of the first to fourth pile circumferential reinforcing bars 11 to 14, the joint structure between the pile 1 and the foundation structure 2 has the above-described effect on the load in at least one direction. Can be played.

DESCRIPTION OF SYMBOLS 1 Pile 1, 1a Pile head, 1s Pile head surface 2 Foundation structure 3 Footing, 5 Body part, 6 Pile circumference reinforcement part 4 Foundation beam 11 1st pile circumference reinforcement, 11a Horizontal reinforcement, 11b Diagonal reinforcement, 11c Vertical Reinforcement 12 Second pile circumference reinforcement, 12a Horizontal reinforcement, 12b Diagonal reinforcement, 12c Vertical reinforcement 13 Third pile circumference reinforcement, 13a Horizontal reinforcement, 13b Diagonal reinforcement, 13c Vertical reinforcement 14 Fourth pile circumference reinforcement, 14a Horizontal reinforcement , 14b Diagonal bars, 14c Vertical bars 16 Pile upper reinforcement bars G Ground S Ground

Claims (5)

It is a joint structure between a pile and a foundation structure,
The foundation structure is made of reinforced concrete having at least one pile circumferential reinforcing bar, and a main body constructed above the pile head surface, and the pile head surface below the pile head surface so as to wrap the pile head surface. A pile circumference reinforcing part constructed integrally with the main body part,
The pile circumference reinforcement is
A horizontal line disposed on one side of the pile in plan view and extending substantially horizontally at the lower part of the pile circumferential reinforcing portion;
A pair of diagonal stripes extending obliquely upward from both ends of the horizontal stripe to the other side of the pile so as to surround the pile in a U shape in plan view in cooperation with the horizontal stripe;
The joint structure of a pile and a foundation structure having a pair of vertical bars extending upward from upper end portions of the pair of diagonal bars.   2. The pile according to claim 1, wherein the pile circumferential reinforcing bar is disposed so that a connection portion between the oblique line and the vertical line is positioned at substantially the same height as the pile head surface. Bonding structure with the foundation structure.   The said foundation structure is further joined to the outer peripheral surface of the said pile, and further has a pile upper reinforcement bar extended upwards rather than a pile head surface and extending to the inside of the said main-body part, It is characterized by the above-mentioned. Or the joint structure of the pile and foundation structure of Claim 2. The foundation structure has a plurality of pile reinforcing bars,
The plurality of pile circumferential reinforcing bars are arranged on the other side of the pile in a plan view, the first pile circumferential reinforcing bar in which the horizontal bars are arranged on one side of the pile in a plan view. The joint structure of a pile and a foundation structure according to any one of claims 1 to 3, comprising a second pile circumferential reinforcing bar. The foundation structure has a plurality of pile reinforcing bars,
The plurality of pile circumferential reinforcing bars include a first pile circumferential reinforcing bar whose horizontal bars are arranged on one side of the pile in a plan view, and the horizontal bars of the first pile circumferential reinforcing bar in a plan view. The joint structure of a pile and a foundation structure according to any one of claims 1 to 4, comprising a third pile circumferential reinforcing bar extending in a direction orthogonal to the horizontal bars.

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