Hydraulic and earth engineering – Foundation – Columnar structure
Reexamination Certificate
2001-03-20
2003-04-29
Will, Thomas B. (Department: 3671)
Hydraulic and earth engineering
Foundation
Columnar structure
C052S167600
Reexamination Certificate
active
06554542
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stress transmission device which is provided between a pile head of a foundation pile and an upper construction portion for transmitting stress between the upper construction portion and the foundation pile, and to a structural element using the same and to a method of construction thereof.
The present application is based upon Japanese Patent Applications Serial Nos. 2000-108477, 2000-169841, 2000-254521, 2000-261948, and 2000-267764, and the contents of said applications are hereby incorporated into the present application by reference.
2. Description of the Related Art
In the prior art, when constructing a building, it is generally performed to support an upper structural portion upon a pile which is emplaced in a supporting ground slab, and moreover to support the entire upper structural portion in this manner.
Although in the prior art the pile head has been rigidly linked to the upper structural portion, in this case if, during an earthquake, a horizontal force is received upon the pile head, there is a fear that the pile head will be destroyed, and in order to prevent this it has become necessary to strengthen the pile head portion by increasing its diameter or the like.
In this connection, in order to reduce the stress which acts upon the pile head, a pin connecting construction has been proposed which connects the pile head to the upper structural portion in a manner to allow relative rotation therebetween, thus being made so as to release the stress upon the pile head; and also a roller connection construction has been proposed which allows sliding movement of the pile head with respect to the building, thus releasing the stress upon the pile head (for example, see Japanese Patent Application Laying-Open Publications Serial Nos. Heisei 1-284613, Heisei 8-120687, Heisei 10-227039, and 10-227040).
However, with a construction such as described above, so as to generate the desirable relative displacement between the pile head and the upper structural portion, it is necessary to reduce the amount of friction between the pile head and the upper structural portion. For this, in order to make the contacting surfaces between the pile head and the upper structural portion smooth, it is necessary to employ a resin process or a mechanical process or the like, and this entails an increase in cost.
Furthermore, with a construction such as described above, when attempting to permit relative displacement between the pile head and the upper structural portion, according to circumstances, there may be a danger of not being able reliably to perform transmission of shearing force.
Moreover, with a construction such as described above, although force may well act in the direction to separate the pile head and the upper structural portion, in the prior art, while allowing relative displacement between the pile head and the upper structural portion, it has not been considered to prevent these from coming apart in the upward direction.
Yet further, since with a construction such as described above the frictional force between the mutually superimposed surfaces has an important effect, it has been necessary to ensure that this frictional force between these surfaces should not vary due to concrete which is poured during constructing flowing in between these surfaces, or due to the generation of corrosion because of invasion of ground water after construction, or due to the invasion of earth or sand or the like.
Still yet further, in order to provide a construction such as described above, after the pile head has been formed, it has been necessary to wait for the concrete which has been poured for the pile head to harden, and to perform processing upon the pile head, and thereafter the process of providing the above described construction has been necessary, which has all necessitated using a time period greater than prescribed.
SUMMARY OF THE INVENTION
The present invention has been conceived as a result of consideration of this type of problem, and has as its objective to propose a stress transmission device, and a structure which employs it, which, without any accompanying elevation of cost, while preventing the transmission of bending moment between the pile head and the upper structural portion, also in this case can satisfactorily cope with shearing force or pulling force or the like acting between the pile head and the upper structural portion.
Further, another objective of the present invention is to propose a stress transmission device, and a structure which employs it, which reliably prevent the entry of foreign objects or matter between the contacting surfaces, so as reliably to realize their function.
Further, another objective of the present invention is to propose a structure and a method of constructing the same, in which the above described stress transmission device can reliably be set up in a short time period, and which thereby make it possible to shorten the period of construction.
In order to attain the above described objectives, the present invention utilizes the following means.
A first aspect of the present invention is a stress transmission device, comprising a pile head member which is set upon a pile head of a foundation pile, and a structure support member which is fixed to an upper structural portion and is arranged to face said pile head member, and said pile head member and said structure support member mutually contact one another in the vertical direction via a first contacting surface which defines a portion of a first imaginary spherical surface, and a tension member is fitted to said pile head member and said structure support member for holding them together in contact while pressing them together via said first contacting surface.
According to the above described structure, it is possible to prevent the structure support member from rising up from the pile head member, provided that the pulling force which acts between the pile head member and the structure support member is less than the pushing force of the tension member.
According to another aspect of the present invention, one of said pile head member and said structure support member is provided with a spherical seat and a concave surface is formed upon the other, and said first contacting surface is constituted by mutually contacting together the outer surface of said spherical seat and said concave surface, and the outer surface of said spherical seat is formed so as to define the same surface as said first imaginary spherical surface, and a through hole is formed in said concave surface for passing through said tension member, and an aperture portion is formed in a position of said spherical seat which opposes said through hole, and, along with said tension member being arranged so as to pass through said through hole and said aperture portion, both its ends are respectively engaged to said pile head member and said structure support member by engagement members.
According to the above described structure, it is possible to press the pile head member and the structure support member together via the first contacting surface.
According to another aspect of the present invention, said tension member is arranged so that its central axis lies along the vertical axis which passes through the center of curvature of said spherical seat.
According to the above described structure, it is ensured that the component of the pushing force between the spherical seat and the concave surface which is perpendicular to the first contacting surface does not become excessive in the vicinity of the outer edge portion of the spherical seat.
According to another aspect of the present invention, one of said engagement members which are provided at both the ends of said tension member contacts said pile head member or said structure support member via a second contacting surface which defines a portion of a second imaginary spherical surface, and the centers of curvature of said first and said second imaginary spherical surfaces c
Aoki Takashi
Arakawa Noriyuki
Ishihara Takahiro
Isoda Kazuhiko
Iwamoto Toshiyuki
Kolisch & Hartwell, P.C.
Mayo Tara L.
Shimizu Construction Co. Ltd.
Will Thomas B.
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