JP2010242289A - Pile cap and joint structure of pile cap and pile head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a pile head which is simple in structure and can reduce the man-hours for construction and a pile cap used for the joint structure. <P>SOLUTION: In a pile cap A including a pressure receiving plate part 1 having stud bolts S and a cylindrical socket part 2 extending from the pressure receiving plate part 1, the lower surface of the pressure receiving plate part 1 is formed flat so as to be brought into contact with a spherical pile head at one point. Therefore, a footing F is not affected by the inclination of a pile b. The footing F is reinforced by embedding the pile cap A therein. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a joint structure between a superstructure and a pile supporting the building, and more particularly to a joint structure between a pile cap and a pile cap and a pile head.

  When joining a superstructure to a pile supporting the building, how to secure the column base where the superstructure load is concentrated and the head of the pile that transmits the load to the ground It is extremely important, and the building foundation structure design guidelines for that purpose are also stipulated.

In general, when a pile is rigidly connected to an upper structure, for example, when a force is applied to the joint due to an earthquake or the like, a bending moment or a shearing force is generated in the pile head B, and the joint may be damaged. is there.
Therefore, a structure in which the pile head B is so-called pin-bonded to the foundation slab (footing) is often used.
Various types of pin joint structures have been developed. For example, in the pin joint structure disclosed in Patent Document 1, the upper structure side upper support and the pile head B side lower support are formed in a spherical shape. Are brought into contact with each other through the concave surface and the convex surface.
The spherical surfaces of the upper support and the lower support are each attracted by magnetic force, the upper support is buried and fixed in a concrete foundation (footing), and the other lower support is fixed to the pile head B of the pile. ing.

Such a pile head joint structure supports the load applied to the footing while maintaining the degree of freedom of positioning at the pile head B, and sufficiently withstands bending force and shearing force.
However, the structure of the upper support and the lower support is inevitably complicated, and as a result, a large number of man-hours are required for the construction, and the cost is increased due to the use of magnetic force.

JP 2005-282139 A

The present invention has been made based on the above technical problems.
That is, an object of the present invention is to provide a pile head joint structure in which a pile head joint structure is simple and construction man-hours can be reduced, and a pile cap used therefor.

  The present inventor has intensively studied in order to solve the above problems, and as a result, the upper structure side upper support is a flat surface, and the pile head side lower support is in contact with the pin head. In addition, the present inventors have found that the degree of freedom can be taken and the structure is simple, and this finding has led to the completion of the present invention.

  That is, the present invention is (1) a pile cap comprising a pressure receiving plate portion having a stud bolt and a cylindrical socket portion extending from the pressure receiving plate portion, and the bottom surface of the pressure receiving plate portion is a spherical pile head. It exists in a pile cap that is flat so as to abut at one point.

  The present invention also includes (2) the pressure receiving plate portion comprising an upper pressure receiving plate portion and a lower pressure receiving plate portion connected to the upper pressure receiving plate portion via a connecting portion, and the lower pressure receiving plate portion has a cylindrical shape. It exists in the pile cap as described in said (1) by which the socket part is extended.

  Moreover, this invention exists in the pile cap as described in said (1) which provided the arrow blade part radially in the socket part of (3) pressure receiving plate parts.

  Moreover, this invention exists in the pile cap as described in said (2) which provided the arrow blade part radially in the socket part of (4) and a 2nd pressure receiving plate part.

  Moreover, this invention exists in the pile cap as described in said (1) which attached the universal cap to the pile head and contact | abutted with respect to the lower surface of a pressure receiving plate part at one point.

  Moreover, this invention exists in the connection pile cap provided with the bridge | bridging part which connects multiple pile caps described in (6), said (2) or (4).

  Further, the present invention resides in (7) the connection pile cap according to (6), wherein the bridge portion is disposed between the upper pressure receiving plate portion and the lower pressure receiving plate portion and is fixed by a fixing tool.

  Moreover, this invention exists in the pile cap as described in said (1) by which the pressure receiving plate part and the socket part are integrally cast-molded.

  Further, the present invention is (9) a joint structure between a pile cap and a pile head, wherein a pile cap comprising a pressure receiving plate portion and a cylindrical socket portion extending from the pressure receiving plate portion is embedded in the footing, Grout material is filled around the pile head with the pile head stored in the socket, and a universal cap with a dome-shaped curved surface attached to the pile head makes contact with the plane of the lower surface of the pressure plate at one point. Exists in the joining structure.

  In addition, as long as the objective of this invention is met, the structure which combined said (1) to (9) suitably is also employable.

The pile cap A of the present invention is a pile cap A comprising a pressure receiving plate portion 1 having a stud bolt S and a cylindrical socket portion 2 extending from the pressure receiving plate portion, and the lower surface 1A of the pressure receiving plate portion 1 is spherical. Since it is a plane so as to come into contact with the pile head B at one point, the footing is not affected by the inclination of the pile.
Further, the footing F is reinforced by embedding the pile cap A.
A bridge portion 3 for connecting a plurality of pile caps A is provided, and the bridge portion 3 is disposed between the upper pressure receiving plate portion 11 and the lower pressure receiving plate portion 12 and is fixed by a fixing tool, whereby a plurality of pile caps are provided. The function A can be exhibited and can sufficiently support the support of the upper structure.

FIG. 1 is a diagram illustrating a pile cap according to the first embodiment. FIG. 2 is an explanatory view showing a joint structure between the pile cap A and the pile head B after construction. FIG. 3 is an explanatory view showing a joint structure in which a steel pipe pile is in a large inclined state. FIG. 4 is a diagram illustrating a pile cap according to the second embodiment. FIG. 5 is a diagram illustrating a pile cap according to the third embodiment. FIG. 6 is a diagram illustrating a pile cap according to the fourth embodiment. FIG. 7 is a diagram illustrating a pile cap according to the fifth embodiment. FIG. 8 is a side view of the double pile cap. FIG. 9 is a diagram showing a double pile cap according to the sixth embodiment. FIG. 10 is a side view of the double pile cap.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary.
In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.
Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified.
Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

First Embodiment FIG. 1 shows a pile cap A of the present embodiment.
The pile cap A is arranged and used so as to accommodate the portion of the pile head B, and has a function of accurately transmitting the load pressure received from the upper structure of the building to the pile.
The pile cap A includes a disk-shaped pressure receiving plate portion 1 and a socket portion 2 extending downward from the pressure receiving plate portion.
It is preferable that the socket part 2 is cylindrical and the thickness is gradually reduced as it goes downward.
A lower surface 1A of the pressure receiving plate portion 1 is a flat portion, and a stud bolt (planting bolt) S is attached to the upper surface so as to protrude.
This attachment may be screwed or welded.
In addition, although the stud bolt S is arrange | positioned circumferentially, it is not necessarily limited to this.
The socket part 2 is hollow and open at the bottom, and has a sufficient space for accommodating the pile head B therein.
In the pile cap A, the pressure receiving plate portion 1 and the socket portion 2 are integrally formed by casting.

FIG. 2 is an explanatory view showing a joint structure between the pile cap A and the pile head B after construction.
The steel pipe pile b is driven into the supporting ground, and a universal cap B1 is bolted to the pile head B via a pile head end plate B2.
The universal cap B <b> 1 has a dome-shaped curved surface, and comes into contact with the lower surface 1 </ b> A of the pressure receiving plate portion 1 in a state of being accommodated in the socket portion 2.
In that case, since the lower surface 1A of the pressure receiving plate portion 1 is a flat surface portion, it comes into contact with the universal cap B1 at one point and is in a point contact state.

In the socket part 2, a grout material (synthetic resin material, cement, etc.) G is filled around the pile head B.
The pile cap A itself is almost entirely hardened with a basic slab to form a footing F.
That is, since the pile cap A itself is embedded and contributes to the strength, the number of reinforcing bars disposed in the footing is smaller in design than the conventional pile head pin joint structure.
As a result, the volume of the footing itself is reduced, and the cost is reduced from the viewpoint of material cost.
Moreover, the universal cap B1 attached to the pile head B is not a surface contact but a point contact with the pressure receiving plate portion 1, and is free to bend as compared with the above-described conventional pin joint contacting a certain range of surfaces. High degree.

By such point joining, even if the steel pipe pile b driven into the ground is in a large inclined state (see FIG. 3), the contact point between the universal cap and the lower surface 1A of the pressure receiving plate portion 1 is moved and adjusted. Therefore, the superstructure integrated with the pile cap A can always be attached in a horizontal state.
In the joining structure with the pile head B using the pile cap A of the present invention, it is very simple simply to put the pile cap A on the pile head B, and the number of man-hours for construction is reduced as compared with the prior art.

Second Embodiment FIG. 4 shows a pile cap A according to a second embodiment.
The pile cap A has a structure in which the pressure receiving plate portion 1 is branched into two, an upper pressure receiving plate portion 11 on the upper side and a lower pressure receiving plate portion 12 on the lower side.
A connecting portion 13 extending downward is formed at the center of the lower surface of the upper pressure receiving plate portion 11 and is coupled to the lower pressure receiving plate portion 12. The lower pressure receiving plate portion 12 is moved downward from the upper pressure receiving plate portion 11 by the connecting portion 13. Are formed a certain distance apart.
The upper pressure receiving plate portion 11 and the lower pressure receiving plate portion 12 may be larger in diameter.
A stud bolt S is attached to the upper surface of the upper pressure receiving plate portion 11 so as to protrude.
A cylindrical socket portion 2 extends from the lower pressure receiving plate portion 12 downward.
The pile cap A is almost entirely fixed by a footing (basic slab) F. However, since the pressure receiving plate portion has a two-stage structure, the footing is further strengthened and the number of reinforcing bars can be reduced.

Third Embodiment FIG. 5 shows a pile cap A according to a third embodiment.
This pile cap A is also used so as to cover the portion of the pile head B, and has a function of transmitting the load pressure received from the upper structure to the pile.
Compared to the pile cap A of the first embodiment, the pile cap A has a socket portion 2 that extends downward longer.
The socket portion 2 is provided with a plurality of arrow blade portions 2A in a radial pattern, and even if the socket portion 2 is long, the strength is ensured by the arrow blade portions 2A.
The pile head B is preferably used for a joining structure when it is necessary to be deeply stored in the socket portion 2.

Fourth Embodiment FIG. 6 shows a pile cap A according to a fourth embodiment.
In this pile cap A, in the pile cap A in which the socket portion 2 of the third embodiment is provided with the arrow blade portion 2A, the pressure receiving plate portion 1 is divided into two parts, an upper upper pressure receiving plate portion 11 and a lower lower pressure receiving plate portion 12 below. Has a branched structure.
Thus, the advantage for the pressure receiving plate portion having a two-stage structure is the same as that of the pile cap A of the second embodiment.

Fifth Embodiment FIG. 7 shows a double pile cap A according to a fifth embodiment.
This double pile cap A is formed by integrally connecting two pile caps A of the second embodiment.
Between the upper upper pressure receiving plate portion 11 on the upper side and the lower lower pressure receiving plate portion 12 on the lower side, there is a bridge portion 3 for connecting both.
Specifically, the bridge portion 3 includes an upper rib portion 31, a lower rib portion 32, and a web portion 33 that couples the upper rib portion 31, the upper rib 31 portion to the upper pressure receiving plate portion 11, and the lower rib portion 32 to the lower pressure receiving plate portion 12. Abut.
In this state, the pile cap A and the bridge portion 3 are fixed using a fixing tool N (bolts, nuts, etc.).

  Although FIG. 7 shows a case where the number of the bridge portions 3 is one, it is naturally also possible to provide a pair of bridge portions 3 on the opposite side of the web portion 33 to form a pair.

FIG. 8 is a side view of the double pile cap A. As shown in FIG.
Note that the stud bolt is omitted.
Since the pile cap A and the bridge part 3 are hardened by footing, the footing is strengthened.
The bridge portion 3 only needs to be able to connect the pile caps A, and the shape thereof can be variously changed.
For example, H-shaped steel, L-shaped steel, hollow steel, etc. are adopted.
The double pile cap A of the present embodiment is applied when the load of the upper structure to be supported is large because it has two pile caps A.

Sixth Embodiment FIG. 9 shows a double pile cap A according to a sixth embodiment.
This double pile cap A is obtained by integrally joining two pile caps A of the fourth embodiment.
The bridge portion 3 is disposed between the upper pressure receiving plate portion 11 and the lower lower pressure receiving plate portion 12 as in the fifth embodiment.

FIG. 10 is a side view of the double pile cap A. As shown in FIG.
Note that the stud bolt is omitted.
There are various merits by providing two pile caps A similar to the fifth embodiment.
In the pile cap A of each embodiment described above, the steel material may be assembled by welding, but in the case of the second and fourth embodiments having the pressure receiving plate portion branched into two, the socket portion has an arrow. In the case of the third embodiment having wings, it is more efficient to form it by casting.

As mentioned above, although this invention was demonstrated to the example, the present invention is not limited only to embodiment mentioned above, A various deformation | transformation is possible.
For example, although the steel pipe pile was demonstrated, if a universal cap is attached, a concrete pile is also employable.
In addition to the embodiment described above, the basic slab and footing can be put in different ways.

DESCRIPTION OF SYMBOLS 1 ... Pressure receiving plate part 11 ... Upper stage pressure receiving plate part 12 ... Lower stage pressure receiving plate part 13 ... Connection part 2 ... Socket part 1A ... Lower surface 2A ... Yaba part 3 ... Bridge Part 31 ... upper rib part 32 ... lower rib part 33 ... web part A ... pile cap (double pile cap)
B ... Pile head b ... Pile (steel pipe pile)
B1 ... Universal cap B2 ... Pile head end plate B3 ... Fastener C ... Foundation slab F ... Footing (foundation slab)
G: Grout material S: Stud bolt N: Fastener

Claims (9)

  A pile cap comprising a pressure receiving plate portion having a stud bolt and a cylindrical socket portion extending from the pressure receiving plate portion, and is flat so that the lower surface of the pressure receiving plate portion comes into contact with the spherical pile head at one point. A pile cap characterized by   The pressure receiving plate portion includes an upper pressure receiving plate portion and a lower pressure receiving plate portion connected to the upper pressure receiving plate portion via a connecting portion, and a cylindrical socket portion is extended to the lower pressure receiving plate portion. The pile cap according to claim 1 characterized by the above-mentioned.   The pile cap according to claim 1, wherein arrow blades are provided radially on the socket part of the pressure receiving plate part.   The pile cap according to claim 2, wherein arrow blades are provided radially in the socket part of the second pressure receiving plate part.   2. The pile cap according to claim 1, wherein a universal cap is attached to the pile head so as to abut against the lower surface of the pressure receiving plate portion at one point.   5. A connection pile cap comprising a bridge portion for connecting a plurality of pile caps according to claim 2 or claim 4.   The connecting pile cap according to claim 6, wherein the bridge portion is disposed between the upper pressure receiving plate portion and the lower pressure receiving plate portion and is fixed by a fixing tool.   2. The pile cap according to claim 1, wherein the pressure receiving plate portion and the socket portion are integrally cast.   A pile cap / pile head joint structure in which a pile cap consisting of a pressure receiving plate portion and a cylindrical socket portion extending from the pressure receiving plate portion is embedded in the footing, and the pile head is housed in the socket portion The joint structure is characterized in that a grout material is filled around the pile head, and a universal cap having a dome-shaped curved surface attached to the pile head is in contact with the plane of the lower surface of the pressure receiving plate portion at one point.

Images