JP4650803B2 - Column base support member and building column base support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a column base support member for connecting and supporting a steel column to an upper part of a pile foundation, and a column base support structure of a building using the column base support member.
[0002]
[Prior art]
Conventionally, various column base support members for connecting and supporting a steel column to an upper part of a pile foundation and a column base support structure of a structure using the column base support member have been proposed.
For example, Japanese Patent Laid-Open No. 10-299081 discloses a column base support structure in which a spring is attached between an anchor bolt nut and a base plate. Japanese Patent Laid-Open No. 10-2126 discloses a column base support structure in which a seismic isolation rubber smaller than the horizontal rigidity of a structure is attached to a pile head.
Japanese Patent Application Laid-Open No. 10-25809 discloses a column base support structure in which a spherical portion and a hemispherical concave portion are combined.
Further, as shown in FIG. 6, a column base support structure comprising a pivot support in which a lower spherical seat 200 having a spherical surface convex toward the upper portion and an upper spherical seat 300 having a spherical surface concave toward the lower portion are combined. It has been known. In this column base support structure, horizontal force is transmitted by the friction in the horizontal direction and the unevenness of the ball seat.
[0003]
[Problems to be solved by the invention]
However, the conventional column base support structure using the anchor spring does not have a complete pin structure because the spring has rigidity, but has a semi-rigid structure. In addition, since the rigidity of the spring varies depending on the creep of the spring and the torque value during construction, it is difficult to maintain and manage the accuracy and performance of the pin structure.
Moreover, the conventional column base support structure using the seismic isolation rubber is not a complete pin structure but a semi-rigid structure because the seismic isolation rubber has rigidity. In addition, the seismic isolation rubber itself is expensive, and the base plate and fastening portion for attaching the seismic isolation rubber become larger, leading to an increase in cost. And the space clearance for the deformation of the seismic isolation rubber is required at the time of horizontal deformation.
[0004]
Furthermore, the conventional column base support structure consisting of pivot bearings has a horizontal force when the center angle of the spherical surface of the ball seat is small, when the axial force is small, or when the ball seat rotates and the concavity and convexity stop engaging. (Shearing force) cannot be transmitted.
In addition, the conventional spherical seat having a spherical surface with a plane angle exceeding 180 degrees is manufactured by machining, and the cost increases because it is processed into a spherical surface.
And when a spherical part becomes large and the board thickness before a process becomes thick, the intensity | strength of the cross-sectional direction of a spherical part will vary, or toughness will fall by the influence of board thickness. In addition, since a device for preventing pin rotation during the construction of the columns and beams is attached, the cost is increased during the construction of the column base support members and the construction.
The present invention has been proposed in view of the above-described circumstances, and is capable of reliably transmitting a shearing force while rotating in an arbitrary direction, and has a simple structure and can achieve cost reduction. An object of the present invention is to provide a column base support structure for members and buildings.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, the column base support member and the column base support structure of the present invention have the following features.
That is, the column base support member of the present invention is a column base support member for connecting and supporting the column to the upper part of the pile foundation,
An inner mold attached to the upper part of the pile foundation and an outer mold attached to the lower part of the pillar and engaged with the inner mold,
The inner mold is composed of a sphere part in which a bottom surface of the sphere is cut into a flat shape, a hole part is formed from the plane toward the inside of the sphere, and a base plate having a protrusion that fits into the hole part,
The base plate is attached to the upper part of the pile foundation, and the outer mold is engaged with the spherical body part, and the column is connected to and supported by the upper part of the pile foundation.
Further, in this column base supporting member, the inner mold has a spherical surface with a central angle of the outer surface shape exceeding 180 degrees,
The outer mold can form a spherical surface with a central angle of 180 degrees on the inner surface, and the outer mold has a spherical surface with a central angle of 180 degrees on the inner surface, It is possible to provide a slip-out preventing portion that engages with the inner mold beyond the spherical surface with a central angle of 180 degrees.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, based on the concrete Example shown in drawing, embodiment of the column base support member and column base support structure of a structure concerning the present invention is described.
<Example 1>
FIG. 1 is a cross-sectional view showing the structure of a column base support member according to Embodiment 1 of the present invention.
As shown in FIG. 1, the column base support member 10 according to the first embodiment of the present invention includes an inner die 30 attached to the upper portion of the pile foundation 20 and an outer portion attached to the lower portion of the pillar 40 and engaged with the inner die 30. It consists of a mold 50.
[0008]
The inner mold 30 includes a spherical body portion 31 that engages with the outer mold 50 and a base plate 32 that is attached to the upper portion of the pile foundation 20. The spherical portion 31 is formed by cutting the lower surface of the spherical body into a flat shape to form a flat portion, and a hole 33 is formed from the flat portion toward the inside of the spherical body. The spherical portion 31 has a spherical surface with an outer surface shape having a central angle exceeding 180 degrees. The base plate 32 has a protrusion 34 that fits into the hole 33 of the sphere 31 and a bolt insertion hole 35 through which the anchor bolt 60 is inserted. The spherical portion 31 and the base plate 32 can be easily manufactured by a technique such as forging.
[0009]
The inner mold 30 has an anchor bolt 60 embedded in the pile foundation 20 and a base plate 32 placed on the upper surface of the pile foundation 20 so that the upper end of the anchor bolt 60 is inserted into the bolt insertion hole 35. It can be attached to the pile foundation 20 by tightening a nut on the top.
[0010]
The outer mold 50 includes an engagement support portion 51 that engages with the inner mold 30 and a column coupling portion 52 that extends upward from the engagement support portion 51.
The engagement support portion 51 has a spherical surface whose inner surface shape has a central angle of 180 degrees. The central angle of this spherical surface is substantially the same as the central angle of the outer surface shape of the inner mold 30. The cylindrical portion 53 may be further extended from the lower end surface of the engagement support portion 51.
The outer mold 50 can be attached to the column 40 by welding the column connecting portion 52 to the lower portion of the column 40 of the structure.
[0011]
The column base support member 10 according to the first embodiment attaches the inner mold 30 to the upper part of the pile foundation 20, attaches the outer mold 50 to the lower part of the pillar 40 of the structure, and engages the outer mold 50 with the inner mold 30. Thereby, the pillar 40 of the structure can be supported on the upper part of the pile foundation 20. Since the outer surface of the inner mold 30 and the inner surface of the outer mold 50 are in contact with each other by a spherical surface, the pillar 40 of the structure can rotate in a given direction with respect to the pile foundation 20 by a predetermined amount.
Therefore, even if a rotational bending moment is generated in the structural column 40 due to an earthquake or wind power, the rotational bending moment can be released at the upper part 20 of the pile foundation.
[0012]
<Example 2>
FIG. 2 is a cross-sectional view illustrating the structure of a column base support member according to Embodiment 2 of the present invention.
The column base support member 100 according to the second embodiment of the present invention has substantially the same shape as the column base support member 10 according to the first embodiment described above, but the slip-out prevention unit 70 is provided at the lower portion of the outer mold 50. The difference is in the provision.
Therefore, in FIG. 2, members having the same functions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The column base support member 100 according to the second embodiment is provided with a slip-out preventing portion 70 that engages with the inner mold 30 beyond the spherical surface with a central angle of 180 degrees at the lower portion of the outer mold 50.
Since the column base support member 100 according to the second embodiment includes the pull-out prevention unit 70, even when a force to pull out the outer mold 50 is applied to the inner mold 30, the inner mold 30 can be removed from the outer mold. It is possible to transmit the axial force and the shearing force without completely separating 50.
[0013]
<Column base support structure>
FIG. 3 is a cross-sectional view showing a part of a column base support structure using the column base support member described above. Moreover, FIG. 4 is explanatory drawing which shows the bending moment in the conventional structure, FIG. 5 is explanatory drawing which shows the bending moment in the structure using the column base supporting member of this invention.
The column base support member 100 described above can be used to connect and support the pile foundation 20 and the pillar 40 in a structure in which one pile foundation 20 and one pillar 40 correspond.
[0014]
1 and 2, as shown in FIGS. 1 and 2, the inner mold 30 is attached to the upper part of each pile foundation 20, and the outer mold 50 is attached to the lower part of each pillar 40. As shown in FIG. Matching columns 40 are connected by underground beams 80.
In this case, the column base support member to be used may be related to Example 1 or Example 2 depending on the form of the structure, and these may be used in appropriate combinations. Also good.
In this way, in a structure in which one pile foundation 20 and one column 40 correspond, the pile foundation 20 and the column 40 are connected and supported using the column base support members 10 and 100 of the present invention. By doing so, the underground beam 80 can be released from the pile head moment.
That is, as shown in FIGS. 4 and 5, in the conventional structure, a large bending moment is applied to the column 40 and its column base, but in the column base support structure of the present invention, the column 40 and its column. The bending moment acting on the legs can be reduced, and the underground beam 80 can be released from the pile head moment.
[0015]
【The invention's effect】
Since the column base support member and the column base support structure of a building of the present invention have the above-described configuration, the following effects can be achieved.
That is, the column base support member of the present invention engages the inner mold and the outer mold to connect and support the pile foundation and the column of the structure. It can be rotated in any direction by a fixed amount.
Therefore, it is possible to reliably transmit the shearing force applied to the column to the pile foundation. Further, since the structure is simple, the manufacture becomes easy and the manufacturing cost can be reduced. Furthermore, when a force for pulling out the outer mold is applied to the inner mold, the stress on the inner mold can be released, and the pile foundation is not burdened.
[0016]
In addition, the column base support member of the present invention cuts the bottom surface of the sphere into a flat shape, and forms a sphere part having a hole from the plane toward the inside of the sphere, and a base plate having a protrusion that fits into the hole part, The inner mold is formed.
Therefore, the inner die can be easily manufactured by forging or the like, and thus the manufacturing cost can be further reduced.
Forming a ball seat with a recess into which a protrusion is fitted at the center by forging can make the crystal uniform and fine in the cross section. Therefore, strength can be secured even with a low C amount steel material, toughness and ductility can be improved and secured, and variation in strength and toughness in the cross section can be suppressed.
[0017]
In addition, the column base support member of the present invention includes a slip-out prevention portion at the lower portion of the outer mold. Therefore, even when a force to pull out the outer mold is applied to the inner mold, the outer mold does not completely separate from the inner mold, and it is possible to transmit axial force and shear force. .
The column base support structure of the present invention uses the column base support member described above to connect and support the pile foundation and the column in a structure in which one pile foundation and one column correspond. .
Therefore, the underground beam can be released from the pile head moment, and the foundation beam can be made steel and ground. In addition, footing and foundation beam work can be saved, and construction costs can be reduced. Furthermore, since it is not necessary to provide foundation beams in the ground, no soil can be removed, and construction that protects the environment that does not adversely affect the global environment is possible.
In addition, it is possible to prevent pin rotation due to the frame rigidity of the connected underground beam even if there is no device in the column base support member or construction method device to prevent pin rotation during construction of columns and beams. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the structure of a column base support member according to Embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view showing the structure of a column base support member according to Embodiment 2 of the present invention.
FIG. 3 is a sectional view showing a part of a column base support structure using the column base support member of the present invention.
FIG. 4 is an explanatory view showing a bending moment in a conventional structure.
FIG. 5 is an explanatory diagram showing a bending moment in a structure using the column base support member of the present invention.
FIG. 6 is an explanatory view showing a conventional pivot support.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10,100 Column base support member 20 Pile foundation 30 Inner type 31 Sphere part 32 Base plate 33 Hole part 34 Projection 35 Bolt insertion hole 40 Column 50 Outer mold 51 Engagement support part 52 Column connection part 53 Cylindrical part 60 Anchor bolt 70 Part 80 Underground beam 200 Lower ball seat 300 Upper ball seat

Claims (3)

A column base support member for connecting and supporting a column at the top of a pile foundation,
It consists of an inner mold that is attached to the upper part of the pile foundation, and an outer mold that is attached to the lower part of the pillar and engages with the inner mold.
The inner mold is composed of a sphere part in which a bottom surface of the sphere is cut into a flat shape, a hole part is formed from the plane toward the inside of the sphere, and a base plate having a protrusion that fits into the hole part,
A column base support member, wherein the base plate is attached to an upper portion of the pile foundation, the outer mold is engaged with the spherical body portion, and the column is connected to and supported by the upper portion of the pile foundation. The column base support member according to claim 1, wherein the inner mold has a spherical surface with an outer surface shape having a central angle exceeding 180 degrees,
The columnar support member, wherein the outer mold has a spherical shape with an inner surface shape of a central angle of 180 degrees. In the column base supporting member according to claim 2,
A column base support member, wherein the outer mold is provided at its lower part with a slip-out prevention portion that engages with the inner mold beyond a spherical surface with a central angle of 180 degrees.

Images