JP2016061118A - Joint structure between pile and column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve a problem with conventional joint structures between a pile and a column for enhancing workability, the conventional joint structures including one that connects a pile head part and a column head part with a footing in between, where the footing encloses many types of reinforcing bars such as a pile head reinforcing bar, a main column reinforcing bar, a main tension reinforcing bar, and a shear reinforcing bar that are arranged densely or intersect in a complicated way, as a result making construction processes burdensome.SOLUTION: A joint structure 10 between a pile and a column includes a pile 12 buried in a ground 16, and a concrete column 14 having a main column reinforcing bar 22 arranged to surround a head part 26 of the pile and connected with the pile by having the head part of the pile embedded in a leg part 28 of the column.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a joint structure between a pile and a column.

  As a joint structure between a pile and a column, there is a structure in which a pile head and a column base are joined through a footing. For example, Patent Document 1 discloses a joint structure in which a footing is joined to a cast-in-place RC pile via a main reinforcing bar.

  However, in the footing, reinforcing bars such as pile head reinforcing bars, column main bars, beam main bars and shear reinforcing bars are mixed, and these reinforcing bars are arranged densely or in a complicated manner. It takes time and effort. Moreover, when the pile has been constructed with a deviation from the regular plane position, these bar arrangement work becomes more difficult.

JP 2006-299760 A

  This invention considers the fact which concerns, and makes it a subject to improve the workability of the joining structure which joins a pile and a column.

  The invention of the first aspect is a concrete product in which a pillar embedded in a ground and a column main bar are arranged so as to surround the head of the pile, and the head of the pile is embedded in a leg and joined to the pile. It is the joining structure of a pile and a pillar which has no pillar.

  In the first aspect of the invention, the portion surrounding the head of the pile in the leg of the column and the column main reinforcement arranged so as to surround the head of the pile transmit the shearing force generated in the column to the pile, Columns can be joined.

  Also, with the joint structure in which the head of the pile is embedded in the leg of the column, the upper structure of the building can be designed with the leg of the column as the pin joint, and the pile can be designed with the head of the pile as the pin joint . Thereby, it can suppress that a bending moment arises in the junction part of a pile and a column, and the junction part of a pile and a column will have to mainly bear transmission of shearing force. Therefore, it is not necessary to arrange reinforcing bars other than the column main reinforcement and shear reinforcement of the column at the joint between the pile and the column, and the pile and the column can be bonded with a simple bonding structure. The workability of the joint structure can be improved.

  According to a second aspect of the invention, in the joint structure of a pile and a column according to the first aspect, a pile head reinforcing bar provided so as to protrude upward from the head of the pile is embedded in a leg portion of the column.

  In the invention of the second aspect, the tensile force generated in the column can be transmitted to the pile by the pile head reinforcing bar.

  In the invention of the third aspect, there is no foundation beam to be joined to the leg portion of the column in the pile-column connection structure of the first or second aspect.

  In the invention of the third aspect, since there is no foundation beam joined to the leg portion of the column, the fixing degree of the column leg portion can be reduced. Thereby, it can suppress more that a bending moment arises in the junction part of a pile and a pillar.

  Since this invention set it as the said structure, the workability of the joining structure which joins a pile and a pillar can be improved.

It is a front sectional view showing the joining structure of a pile and a pillar concerning an embodiment of the present invention. It is AA sectional drawing of FIG. It is front sectional drawing which shows the variation of the joining structure of the pile which concerns on embodiment of this invention, and a column. It is BB sectional drawing of FIG.

  Embodiments of the present invention will be described with reference to the drawings. First, the joint structure of a pile and a column according to an embodiment of the present invention will be described.

  In the front cross-sectional view of FIG. 1, a pile-column joining structure 10 of the present embodiment is shown. The pile-column connection structure 10 includes a pile 12 and a column 14.

  As shown in FIG. 1 and FIG. 2, which is a cross-sectional view taken along line AA in FIG. 1, the pile 12 is a cylindrical pre-tensioned centrifugal high-strength prestressed concrete pile (so-called pre-made PHC pile). 16 is embedded.

  The column 14 is a member made of prismatic steel reinforced concrete, and a square steel pipe 20, a column main bar 22, and a shear reinforcement bar 24 are embedded in a column main body 18 formed of concrete. The square steel pipe 20 is arranged at a substantially central portion of the column main body 18, and a plurality of column main bars 22 are arranged so as to surround the square steel pipe 20. A plurality of shear reinforcement bars 24 are arranged in the vertical direction so as to surround the plurality of column main bars 22.

  The pillar 14 is arranged so that the column main reinforcement 22 is disposed so as to surround the pile head 26 as the head of the pile 12, and the pile head 26 is provided at a substantially central portion of the column base part 28 as the leg part of the column 14. Is buried with the pile 12. Hereinafter, the portion of the column base portion 28 embedded in the ground 16 is referred to as a bearing portion 30.

  The plane cross section of the bearing section 30 is larger than the plane section of the column 14 other than the bearing section 30. The size of the flat section of the bearing section 30, the distance R from the outer circumferential surface of the pile head 26 to the outer circumferential surface of the bearing section 30, the height H of the bearing section 30, and the pile head 26 relative to the column base 28. The wrap length L and the wrap length L of the lower end portion of the column main reinforcement 22 with respect to the pile head 26 are values that can transmit the shearing force generated in the column 14 to the pile 12.

  Unlike the general footing, the foundation beam is not joined to the column base part 28. That is, the pile-column joint structure 10 does not have a foundation beam joined to the column base 28. Further, the pile 12 is not provided with a pile head muscle protruding upward from the pile head 26.

  Next, the action and effect of the joint structure between the pile and the column according to the embodiment of the present invention will be described.

  In the pile-column joint structure 10 of this embodiment, as shown in FIGS. 1 and 2, the column 14 includes a column supporting portion 30 and a column main reinforcement 22 arranged so as to surround the pile head 26. The shear force generated in 14 can be transmitted to the pile 12, and the pile 12 and the column 14 can be joined.

  Moreover, in the pile-column joint structure 10 of the present embodiment, the upper structure of the building is designed with the column base portion 28 as a pin joint by the joint structure in which the pile head portion 26 is embedded in the column base portion 28, and the pile head portion The pile 12 can be designed with 26 as a pin joint. Thereby, it can suppress that a bending moment arises in the junction part of the pile 12 and the pillar 14, and the junction part of the pile 12 and the pillar 14 should just bear transmission of a shearing force mainly. Therefore, it is not necessary to arrange reinforcing bars other than the column main reinforcement and shear reinforcement of the column 14 at the joint between the pile 12 and the column 14, and the pile 12 and the column 14 can be joined with a simple joining structure. The workability of the joining structure for joining 12 and the column 14 can be improved.

  Furthermore, in the pile-column joint structure 10 of the present embodiment, since there is no foundation beam to be joined to the column base 28, the fixing degree of the column base 28 can be reduced. Thereby, it can suppress more that a bending moment arises in the junction part of the pile 12 and the pillar 14. FIG.

  Moreover, in the joint structure 10 of a pile and a column of this embodiment, the top end level of the pile 12 can be raised compared with the conventional joint structure which joins a pile and a column via footing. Thereby, the amount of excavated soil can be reduced.

  Furthermore, in the pile-column joint structure 10 of the present embodiment, for the construction error (planar layout error) of the pile 12, eccentric bending due to the construction error is performed by arranging additional reinforcing bars on the column main bars 22. Can be processed.

  The embodiment of the present invention has been described above.

  In this embodiment, an example in which the column 14 is a member made of steel reinforced concrete has been shown. However, the column 14 may be a column having a column main reinforcement, and may be a member made of reinforced concrete, for example.

  Moreover, in this embodiment, although the pile 12 was shown as the ready-made pre-tension type centrifugal force high-strength prestressed concrete pile, the pile 12 was made of steel pile, reinforced concrete pile, prestressed concrete pile, high-strength concrete pile, etc. Various types of ready-made piles and cast-in-place piles can be used. For example, the pile 12 may be a steel pipe pile, an H-shaped steel pile, a concrete pile with a shell steel pipe (so-called SC pile), or a centrifugal prestressed reinforced concrete pile (so-called PRC pile). The pile 12 is preferably a small-diameter ready-made pile having a high supporting force.

  Furthermore, in this embodiment, although the example in which the pile head muscle which protrudes upwards from the pile head 26 was shown in the pile 12 was shown, front sectional drawing of FIG. 3, and BB sectional drawing of FIG. A pile head reinforcing bar 34 protruding upward from the pile head 26 may be embedded in the column base 28 as shown in FIG.

  The pile head reinforcing bar 34 is bent at the base portion so that the upper end portion spreads outward, and is disposed so as to surround the square steel pipe 20. In addition, the pile head reinforcement 34 is surrounded by the column main reinforcement 22. That is, the pile head reinforcing bars 34 are disposed between the square steel pipe 20 and the column main bars 22.

  In this way, the tensile force generated in the column 14 can be transmitted to the pile 12 by the pile head reinforcing bar 34.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

10, 32 Joint structure of pile and column 12 Pile 14 Column 16 Ground 22 Column main reinforcement 26 Pile head (head of pile)
28 Column base (column leg)
34 Pile head reinforcement

Claims (3)

A pile buried in the ground,
Column main bars are arranged so as to surround the head of the pile, and a concrete column in which the head of the pile is embedded in a leg and joined to the pile,
Pile-column connection structure with   The pile-column joining structure according to claim 1, wherein a pile head reinforcing bar provided so as to protrude upward from the head of the pile is embedded in a leg portion of the column.   The pile-column connection structure according to claim 1 or 2, wherein there is no foundation beam to be bonded to the leg portion of the column.