JP3615157B2 - Foundation structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foundation structure.
[0002]
[Prior art]
As the foundation structure supported by the pile, that shown in FIG. 8 is known. In this foundation structure 30, a foundation 32 is constructed on an upper portion of a pile 31, and a reinforcing bar 33 extending from the pile 31 is arranged on the foundation 32.
[0003]
[Problems to be solved by the invention]
However, since the piles and foundations are rigidly connected to each other as described above, if a so-called direct earthquake occurs, the vertical load may be transmitted to the superstructure through the piles, causing serious damage. In the case of a horizontal load due to an earthquake, there was a risk of serious damage to the joint between the pile and the foundation.
[0004]
The present invention has been made in view of the problems as described above, and its purpose is that the upper structure or the joint between the pile and the foundation is not damaged by the vertical load and horizontal load caused by the earthquake, and acts on the pile head. It is to provide a foundation structure capable of reducing the bending moment to be reduced.
[0005]
[Means for Solving the Problems]
The invention of claim 1 for solving the above problems, the basal through the elastic material pile head formed on the conical built edge cut shape with a net cover Rutotomoni, from the central portion of the pile head The pile and the foundation are connected by the protruding connecting material, and the connecting material is formed by alternately arranging the vertical bars and the PC steel material in an annular shape, and covering the PC steel material located on the foundation side of the connecting material with a sheath. It is characterized by unbonding and pin-joining the pile and foundation.
[0006]
A connecting member disposed from the pile to the foundation can be provided on the upper part of the reinforcing bar rod. Since the pile and the foundation are pin-connected, the pile head can be rotated smoothly and the bending moment acting on the pile head can be reduced, so that the cross section of the underground beam can be reduced. Since the vertical load caused by the direct earthquake is relaxed by the elastic material, it is possible to prevent the foundation structure and superstructure from being destroyed. By covering a part of the PC steel material with a sheath, the PC steel material can be protected, and a so-called unbond can be formed. The shear force acting on the pile due to the direct earthquake is resisted by the connecting material and the conical pile head. A foundation structure in which the pile and the foundation are pin-joined can be easily constructed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a reinforcing bar for pile foundation (hereinafter referred to as a reinforcing bar), a foundation structure, and a construction method thereof according to the present invention will be described. First, the reinforcing bar rod will be described, and then the basic structure using the reinforcing bar rod and its construction method will be described. In the embodiments, the same components are described with the same reference numerals, and only different components are described with different reference numerals.
[0008]
1 and 2 show an embodiment of a reinforcing bar rod. In this reinforcing bar rod 1, a mesh lid 5 is covered on the upper surface of a casing 4 composed of a main reinforcing rod 2 and a strip reinforcing rod 3, and the mesh lid 5 A connecting member 6 is attached to the center. The net cover 5 is formed in a conical shape from a pile head oblique line 7 inclined upward from the band 3 toward the center and reinforcing bars 8 having different diameters. The connecting member 6 is formed by alternately arranging vertical bars 11 and PC steel members 12 on the peripheral surfaces of the upper and lower rings 9 and 10, and the PC steel members 12 are bound by spiral bars 13. Further, crimp grips 14 are provided at the upper and lower end portions of the PC steel material 12, and a sheath 15 is covered on the upper side so as to be in a so-called unbonded state. Further, a ring plate 16 is connected to the upper ring body 9 of the connecting member 6 by a connecting plate 17 in a radial arrangement, and the connecting plate 17 is welded to the pile head oblique muscle 7 of the net cover 5. Therefore, an insertion port 18 for a tremy tube made of the connecting member 6 is formed at the center of the mesh lid 5 in the housing 4. When the cast-in-place concrete pile is constructed, the reinforcing bar 1 can be installed in the excavation hole and simultaneously arrange the connecting material 6 to the foundation.
[0009]
Next, an embodiment of a basic structure using the above-described reinforcing bar 1 will be described with reference to FIGS. The foundation structure 20 includes a conical pile head 21 a and a base 23 constructed through an elastic material 22, and a connecting material 6 shown in FIGS. 1 and 2 is disposed between the foundation 23 and the pile 21. Yes. Since the pile 21 and the foundation 23 are pin-bonded by the connecting material 6 and the pile 21 and the foundation 23 are edged by the elastic material 22, the pile head 21 a freely rotates and acts on the upper structure 24. The horizontal load caused by the earthquake can be attenuated. Further, the pile head 21a is rotated smoothly because the PC steel material 12 on the foundation 23 side is covered with the sheath 15 to be unbonded.
[0010]
The elastic material 22 on the top surface of the pile is rubber, sand, laminated material of rubber and sand, laminated material in which sand is covered with upper and lower polyethylene films, or asphalt mixed with sand, and vertical load due to earthquake acting on the upper structure 24 It acts as a shock absorber that attenuates the vibration. Therefore, it is possible to prevent the upper structure 24 from being damaged by the vertical vibration caused by the direct earthquake.
[0011]
Next, the construction method of this foundation structure 20 is demonstrated based on FIGS. First, an excavation hole 25 for a cast-in-place concrete pile is formed, and a casing 26 is inserted therein. 1 is installed in the excavation hole 25, the treme tube 27 is inserted from the insertion port 18 of the connecting member 6, and concrete 28 is driven. Pull up. Since the PC steel material 12 is covered and cured by the sheath 15, the PC steel material 12 is not damaged even by inserting the tremy tube 27 into the connecting material 6 and placing concrete 28 in the tremy tube 27.
[0012]
Next, as shown in FIG. 6, the concrete 28 is placed until a surplus portion 29 is formed on the upper portion of the reinforcing bar 1 by the trayy tube 27, and after the surplus portion 29 is formed, the casing 26 is pulled out, The tremy tube 27 is also pulled out from the insertion port 18 of the connecting member 6. At this time, the upper PC steel 12 is wired to the base 23.
[0013]
Next, as shown in FIG. 7, the surplus portion 29 is suspended up to the upper surface of the connecting plate 17 as a mark. Even during the lifting operation, the PC steel material 12 is covered with the sheath 15 and cured, so that it does not break. Then, after the suspension operation is completed, an elastic material 22 such as rubber, sand, a laminated material of rubber and sand, or a laminated material in which sand is covered with upper and lower polyethylene films is spread on the upper surface of the pile 21. Next, the reinforcing bars for the foundation are arranged and the foundation mold is assembled and formed (not shown), and concrete is placed therein to construct the foundation structure 1.
[0014]
【The invention's effect】
A connecting member disposed from the pile to the foundation can be provided on the upper part of the reinforcing bar rod.
[0015]
Since the pile and the foundation are pin-connected, the pile head can be rotated smoothly and the bending moment acting on the pile head can be reduced, so that the cross section of the underground beam can be reduced.
[0016]
Since the vertical load caused by a direct earthquake can be relaxed with an elastic material, the foundation structure and superstructure can be prevented from being destroyed.
[0017]
The coated steel can protect the PC steel material and can also be a so-called unbond.
[0018]
The connecting material and the conical pile head can resist the shearing force acting on the pile.
[0019]
The Tremy tube can be installed in the central part of the reinforcing bar rod through the connecting material insertion port provided in the central part of the reinforcing bar rod.
[0020]
A foundation structure in which the pile and the foundation are pin-joined can be easily constructed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a reinforcing bar rod.
FIG. 2 is a plan view of a reinforcing bar rod.
FIG. 3 is a longitudinal sectional view of a basic structure.
FIG. 4 is a cross-sectional view of the foundation structure.
FIG. 5 is a cross-sectional view showing a construction method of a foundation structure in which concrete is placed in an excavation hole.
FIG. 6 is a cross-sectional view showing a construction method of a foundation structure that forms an extra portion.
FIG. 7 is a cross-sectional view showing a construction method of a foundation structure that forms a foundation with an extra portion.
FIG. 8 is a cross-sectional view of a conventional basic structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforcement rod 2 Main reinforcement 3 Band reinforcement 4 Frame 5 Net cover 6 Connection material 7 Pile head oblique muscle 8 Reinforcement reinforcement 9, 10 Ring body 11 Longitudinal reinforcement 12 PC steel material 13 Spiral reinforcement 14 Crimp grip 15 Sheath 16 Ring plate 17 Connection plate 18 Inserts 20 and 30 Foundation structure 21 and 31 Pile 21a Pile head 22 Elastic material 23 and 32 Foundation 24 Upper structure 25 Excavation hole 26 Casing 27 Tremy tube 28 Concrete 29 Extra-stress part 33 Reinforcing bar

Claims (1)

Built pile head formed conically with a net lid through an elastic material underlying edge cut shape Rutotomoni, the pile and the base are connected by a connecting member projecting from the central portion of the pile head, the connection Longitudinal bars and PC steel are alternately and annularly arranged, and the PC steel located on the foundation side of the connecting material is covered with a sheath and unbonded to form a pin joint between the pile and the foundation. Basic structure.

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