JP3909392B2 - Column base support structure and its construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a column base support structure for supporting a column base of a building on a foundation and a construction method thereof.
[0002]
[Prior art]
Conventionally, various column base support structures for connecting and supporting a column base such as a steel column on a foundation 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. 2001-73390 includes a foundation-side spherical member provided on the head of a foundation pile, and an upper structure-side spherical member having a spherical surface along the spherical surface of the foundation-side spherical member. A column base support structure in which a stopper pin is penetrated along an axis common to the spherical surface of the spherical member is disclosed.
[0003]
[Problems to be solved by the invention]
However, in the column base support structure disclosed in Japanese Patent Application Laid-Open No. 10-299081, when an earthquake occurs, the anchor bolt receives a large shearing force and tensile force in a short range, and thus easily breaks. In addition, since the anchor bolt is yielded and plastically deformed, it does not have a complete pin structure but a semi-rigid structure. For this reason, it is difficult to model at the time of design. Furthermore, when the anchor bolt is displaced, it is difficult to correct the anchor bolt, which may hinder the construction.
In addition, in the column base support structure disclosed in Japanese Patent Application Laid-Open No. 2001-73390, the reaction force concentrates on the center part of the column base support structure over a long period of time, so the area and thickness of the upper structure side spherical member are increased. It must be done and the cost will increase. Further, since the shearing force of the structure is transmitted from the anchor bolt to the foundation as the shearing force of the anchor bolt (rebar), the anchor bolt must be thickened, which is uneconomical. Furthermore, when the anchor bolt is displaced, it is difficult to correct the anchor bolt, which may hinder the construction. In addition, the pulling force during pulling is transmitted from the stopper pin to the anchor bolt via the base spherical member, which increases the number of members, complicates the structure, and increases the cost. End up. Furthermore, until the stopper pin breaks, both spherical members are fixed and rigidly connected, so that a sufficient function as the column base support structure cannot be exhibited. Further, when the stopper pin is replaced after the stopper pin is broken, it is necessary to expose the column base portion of the building and lift and replace the building, which is very expensive.
The present invention has been proposed in view of the above-described circumstances, and can reliably transmit shearing force to the foundation, has excellent followability to vertical and horizontal deformation, and has a simple structure and low cost. An object of the present invention is to provide a column base support structure for a building that can be planned and a construction method thereof.
[0004]
[Means for Solving the Problems]
The column base support structure for a structure and the construction method thereof according to the present invention have the following features in order to achieve the above-described object.
That is, the column base support structure of the structure according to the present invention is a column base support structure for supporting the column base of the building on the foundation,
A base plate that is attached to a lower end portion of the column base; and a receiving member that is fixed on the foundation and supports the base plate from below. The base plate includes a ring that protrudes downward from a lower surface thereof. A ring-shaped protrusion, and a tip of the ring-shaped protrusion is formed in a spherical shape protruding downward, and the receiving member has a spherical surface portion on which the ring-shaped protrusion is slidably supported. together Ru provided so as to be concave upwardly, located on the inner peripheral side of the distal end portion of the ring-shaped projection, thereby restricting the sliding of the lateral direction of the ring-shaped protrusion, for receiving the shear force Shear force receiving projections are provided, and the base plate and the foundation are connected by a connecting member.
[0005]
Further, in the column base support structure of the building, it is possible to provide a fixing member for shearing force in the foundation for restricting movement of the receiving member in the left-right direction and receiving shearing force.
Further, in the column base support structure of the building, the base plate may be provided with an inclination adjusting member for adjusting the inclination of the base plate in at least three positions on the outer periphery thereof so as to be detachable from the base plate. It is.
Furthermore, it is possible to provide the spherical plate mounting position on the base plate and the ring-shaped projection mounting position on the receiving material in the opposite manner.
[0006]
The construction method of the column base support structure for a building according to the present invention includes a step of installing a cylindrical formwork on the surface of the foundation where the foundation is installed, and placing foundation concrete around the formwork, and the mold A shearing force fixing material for receiving shearing force is positioned inside the frame, and a filler is filled between the mold and the shearing force fixing material to fix the shearing force fixing material in the foundation. A step of fixing a receiving material to the upper portion of the foundation so as to come into contact with the fixing member for shearing force; and a base plate for attaching to a lower end portion of a column base of a building on the upper portion of the receiving material. And a step of connecting an upper end portion of a connecting member embedded in the foundation and the base plate, and the base plate is provided with a ring-shaped protrusion protruding downward from a lower surface thereof, The tip of the ring-shaped protrusion The portion is formed in a spherical shape protruding downward, and the receiving member is provided with a spherical portion on the upper surface thereof for slidably supporting the ring-shaped protrusion so as to be concave downward. It is characterized by this.
[0007]
Further, in the construction method of the column base support structure of the building, the base plate is provided with inclination adjusting members for adjusting the inclination of the base plate in at least three places on the outer periphery thereof so as to be separated from the base plate. A step of adjusting the inclination of the base plate and the column base by the inclination adjusting member when attaching the column base of the building on the base plate; and separating the inclination adjusting member from the base plate; A step of allowing sliding with the base plate.
In the step, a configuration may be used in which the base plate and the receiving material are reversely provided at the attachment positions of the ring-shaped protrusion and the spherical portion for slidably supporting the protrusion.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, based on the concrete Example shown in drawing, embodiment of the column base support structure of the building which concerns on this invention, and its construction method is described.
1-3 show the column base support structure of the building which concerns on embodiment of this invention, FIG. 1 is a longitudinal cross-sectional view of a column base support structure, FIG. 2 is AA 'cutting | disconnection in FIG. FIG. 3 is a sectional view taken along the line BB ′ in FIG.
<Overall schematic configuration>
As shown in FIGS. 1 to 3, the column base support structure for a building according to the embodiment of the present invention is fixed to the base plate 2 for attaching to the lower end portion of the column base 1 and the base concrete 3. And a receiving member 4 for supporting from below.
[0009]
<Base plate>
As shown in FIGS. 1 and 2, the base plate 2 is formed of a substantially square plate-like member, and a ring-shaped protrusion 5 protruding downward is provided on the lower surface thereof. The tip of the ring-shaped protrusion 5 has a spherical shape protruding downward. Further, a bolt insertion hole (not shown) for inserting the upper end portion of the anchor bolt 6 may be provided at almost one central portion of the base plate 2 = 1 or more. Further, a fastener member 8 for attaching a tilt adjusting bolt 7 to be described in detail later is connected to the base plate 2 so that it can be separated from the base plate 2 in the middle of each outer periphery of the base plate 2. Furthermore, a prismatic rib 9 for supporting the column base 1 of the building is provided on the upper surface of the base plate 2 so as to protrude upward. The shape of the base plate 2 is not limited to a substantially square shape, and may be other shapes such as a disk shape.
[0010]
<Receiver>
As shown in FIGS. 1 and 3, the receiving member 4 is formed of a donut-like plate-like member, and on its upper surface, a spherical portion 10 for slidably supporting the ring-shaped protrusion 5 is directed upward. It is provided to be concave. Further, the upper surface of the receiving member 4 is located on the inner peripheral side of the tip end portion of the ring-shaped protrusion 5 and restricts the sliding of the ring-shaped protrusion 5 in the left-right direction to receive the shearing force. 11 is provided.
The shape of the receiving material 4 is not limited to a donut shape, and the outer peripheral shape and the inner peripheral shape may be other shapes such as a substantially square shape.
In the above embodiment, the ring-shaped protrusion 5 is provided on the base plate, and the spherical portion 10 for slidably supporting the ring-shaped protrusion 5 is provided on the receiving member 4. Needless to say, when the positional relationship is reversed, that is, the base plate may be provided with a spherical portion and the receiving member may be provided with a ring-shaped protrusion.
[0011]
<Fixing material for shear force>
In the basic concrete 3, a fixing member 12 for shearing force is installed to contact the inner periphery of the receiving member 4 to restrict the movement of the receiving member 4 in the left-right direction and to receive the shearing force. . The fixing member 12 for shearing force is made of a cylindrical steel material, and is installed in the foundation concrete 3 when the foundation concrete 3 is placed.
The shape of the fixing member 12 for shearing force is not limited to a cylindrical shape, and other shapes such as a rectangular tube shape can be used as long as it matches the outer peripheral shape of the hollow portion provided at the center of the receiving material 4. It may be.
[0012]
<Anchor bolt>
The anchor bolt 6 is a connecting member for connecting the anchor plate 13 embedded in the foundation concrete 3 and the base plate 2, and has a female screw portion (not shown) formed at the lower end and the upper end thereof. .
The lower end portion of the anchor bolt 6 is connected to an anchor plate 13 embedded in the foundation concrete 3 using a nut. On the other hand, the upper end portion of the anchor bolt 6 is connected to the base plate 2 using a nut.
Here, by increasing the unconstrained length of the anchor bolt 6, the followability in the vertical and horizontal directions is increased, and the anchor bolt 6 can be prevented from breaking.
In addition, by designing the anchor bolt 6 so that the sum of the tensile-bending stress and the compressive-bending stress does not exceed the yield stress, a pin-base column base support structure is realized with the anchor bolt 6 remaining in an elastic structure. Even if stress is applied due to an earthquake or the like, there is no need to replace the column base.
The thickness, length, and material of the anchor bolt 6 can be appropriately changed according to the structure of the building to be supported, the weight, the expected compressive stress, the pulling stress, and the like.
[0013]
<Bolt for tilt adjustment>
The inclination adjusting bolt 7 is an inclination adjusting member for adjusting the inclination of the base plate 2, that is, the inclination of the column base 1 to be supported when the base plate 2 is installed, and is connected to the base plate 2 in a detachable manner. Each fastener member 8 is screwed. An adjuster nut 14 is attached to the tilt adjusting bolt 7 so as to be positioned on the lower surface of the fastener member 8.
Note that the number of the inclination adjusting bolts 7 is not limited to four, and three or more may be provided at positions where the outer peripheral portion of the base plate 2 is divided approximately equally.
[0014]
<Construction method>
Next, based on FIG. 6, the construction method of the column base support structure which concerns on this embodiment is demonstrated.
Drawing 6 is an explanatory view explaining the construction method of the column base support structure in order.
In order to construct the column base support structure according to this embodiment, as shown in FIG. 6A, a cylindrical formwork is installed on the ground surface, and the foundation concrete 3 is placed around the formwork 15. To do. At this time, anchor bolts 6 fixed to an anchor plate (not shown) are also embedded in the foundation concrete 3.
Subsequently, as shown in FIG. 6B, the shear force fixing material 12 is positioned inside the mold 15, and the filler 16 is filled between the mold 15 and the shear force fixing material 12. The fixing material 12 for shearing force is fixed in the basic concrete 3.
Subsequently, as shown in FIG. 6C, the receiving material 4 is fixed to the upper portion of the foundation concrete 3 so as to come into contact with the fixing material 12 for shearing force.
Although the subsequent steps are not shown, a base plate 2 for mounting on the lower end portion of the column base 1 of the building is placed on the upper portion of the receiving material 4, and the upper end portion of the anchor bolt 6 is inserted into the base plate 2. The base plate 2 and the anchor bolt 6 are connected using a nut.
Further, when the building column base 1 is mounted on the base plate 2, the length of the inclination adjusting bolt 7 protruding from the fastener member 8 is adjusted, and the adjuster nut 14 is tightened to fix the base plate 2 and the column base 1. Adjust the tilt. Then, the fastener member 8 is separated from the base plate 2 so that the receiving member 4 and the base plate 2 can slide.
[0015]
<Mechanism of compression and bending>
Next, the operation of the column base support structure when compressive stress and bending are applied to the building will be described.
FIG. 4 is an operation explanatory view of the column base support structure when compressive stress and bending act on the building. In FIG. 4, it is assumed that compressive stress and bending act in the direction indicated by the thick arrow.
When compressive stress and bending act on the building, as shown in FIG. 4, the stress of a ₁ acts in the horizontal direction and the stress of b _{1 in} the vertical direction on the contact curved surface between the base plate 2 and the receiving material 4. Works. Therefore, the stress of c ₁ acts on the contact curved surface of the base plate 2 and the receiving member 4 as a resultant force of a ₁ and b _{1 in} the diagonally downward direction to the right. Thereby, the bending from the building can be decomposed into the shearing force and the compressive force on the contact curved surface, and the bending can be borne by the curved surface.
That is, when the shearing force is transmitted to the ring-shaped projection 5 → the receiving material 4 → the fixing member 12 for the shearing force and bears the shearing force, and a larger shearing force is generated and the base plate moves in the horizontal direction, the shearing receiving projection 11 And the ring-shaped protrusion 5 come into contact with each other and bear a shearing force.
[0016]
<Drawing and bending mechanism>
Next, the operation of the column base support structure when pulling stress and bending act on the building will be described.
FIG. 5 is an operation explanatory diagram of the column base support structure when the drawing stress and bending act on the building. In FIG. 5, it is assumed that drawing stress and bending act in the direction indicated by the thick arrow.
When pulling stress and shearing stress are applied to the building, as shown in FIG. 5, a ₂ stress is applied in the horizontal direction and b ₂ is applied in the vertical direction on the contact curved surface between the base plate 2 and the receiving material 4. Stress acts. Therefore, the stress of c ₂ acts on the contact curved surface between the base plate 2 and the receiving member 4 as a resultant force of a ₂ and b _{2 in} the diagonally downward direction to the right. Thereby, when bending acts, it can decompose | disassemble into a shear force and a compressive force in a contact curved surface, and can bear bending by a curved surface.
In this state, the anchor bolt 6 is extended to bear a pulling stress. Further, when the shearing force is transmitted to the ring-shaped projection 5 → the receiving material 4 → the fixing member 12 for shearing force, bears a shearing stress, and a larger shearing force acts and the base plate moves horizontally, the shearing receiving projection 11 And the ring-shaped protrusion 5 come into contact with each other and bear a shearing force.
[0017]
【The invention's effect】
Since the column base support structure of a building and the construction method thereof according to the present invention have the above-described configuration, the following effects can be achieved.
That is, the column base support structure for a building according to the present invention can bear a shearing force and a compressive force by bringing the ring-shaped protrusion 5 and the receiving member 4 into contact with the spherical surface on the base plate and the receiving member, respectively. Both of them rotate and slide to form a pin structure, which can be easily modeled at the time of design.
In addition, by making the sliding portion of the base plate and the receiving material into a ring shape, it is possible to transmit the force to the receiving material without concentration of stress, and to approximate the cross section of a member such as a column base from such a shape. In addition, the cost can be reduced by efficiently designing the size of the base plate.
In addition, by directly connecting the base and the base plate by the connecting member, the number of members can be reduced and the cost can be reduced.
Also, by controlling the sliding of the ring-shaped protrusions in the left-right direction and providing a shearing force-receiving protrusion to receive the shearing force, the shearing force from the building is transmitted to the foundation without burdening the connecting member. Therefore, the connecting member can be prevented from being broken.
In addition, by providing a fixing material for shearing force in the foundation that restricts the lateral movement of the receiving material and receives shearing force, the connecting member only has to bear the tensile force at the time of pulling out. The burden on the member can be reduced.
Further, at the time of construction, positioning can be performed with a fixing member for shearing force, and the non-fixing length of the connecting member becomes long, so that correction becomes easy.
In addition, by providing an inclination adjusting member for adjusting the inclination of the base plate, correction during construction is facilitated and there is no possibility of hindering construction. And since an anchor bolt does not fracture at the time of an earthquake, it is not replaced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a column base support structure according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA ′ in FIG.
3 is a sectional view taken along line BB ′ in FIG. 1. FIG.
FIG. 4 is an operation explanatory diagram of a column base support structure when compressive stress and shear stress are applied to a building.
FIG. 5 is an operation explanatory view of a column base support structure when a pulling stress and a shearing stress are applied to a building.
FIG. 6 is an explanatory view illustrating the construction method of the column base support structure in order.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Column base 2 Base plate 3 Foundation concrete 4 Receiving material 5 Ring-shaped protrusion 6 Anchor bolt 7 Tilt adjusting bolt 8 Fastener member 9 Rib 10 Spherical surface part 11 Shear force receiving protrusion 12 Shear force fixing material 13 Anchor plate 14 Adjuster nut 15 Type Frame 16 Filler

Claims (6)

A column base support structure for supporting a column base of a building on a foundation,
A base plate for attaching to the lower end of the column base;
A receiving material fixed on the foundation and supporting the base plate from below;
The base plate is provided with a ring-shaped protrusion that protrudes downward from the lower surface thereof, and the tip of the ring-shaped protrusion has a spherical shape that protrudes downward,
Wherein the receiving member is provided at its upper surface, both Ru provided so as to be concave spherical portion for slidably supporting the ring-shaped projection upward, the inner circumferential side of the distal end portion of the ring-shaped projection Is provided with a shear force receiving projection for restricting the sliding of the ring-shaped projection in the left-right direction and receiving the shearing force,
A column base support structure for a building, wherein the base plate and the foundation are connected by a connecting member. During the foundation, to regulate the lateral movement of the receiving member, the column base support structure of claim 1 building, wherein in that a shearing force for fixing material for receiving the shear force . Said base plate, at least three locations of the outer periphery thereof, an inclination adjustment member for adjusting the tilt of the base plate, any of claims 1 or 2, characterized in that arranged to be disconnected from the base plate 1 Column base support structure of the building described in the item. Provided the spherical portion on the lower surface of the base plate, because, characterized in that a spherical portion on the receiving member top surface a ring-like protrusion for slidably supporting according to any one of claims 1 to 3 Column base support structure of the building. Installing a cylindrical formwork on the ground surface where the foundation is installed, and placing foundation concrete around the formwork;
A shear force fixing material for receiving shear force is positioned inside the mold, and a filler is filled between the mold and the shear force fixing material, so that the shear force fixing material is used as a basis. Fixing to
Fixing the receiving material to the upper part of the foundation so as to come into contact with the fixing material for shearing force;
Placing a base plate to be attached to the lower end of the column base of a building on the upper part of the receiving material;
The upper end of the connecting member embedded in the foundation and the step of connecting the base plate,
The base plate is provided with a ring-shaped protrusion that protrudes downward from the lower surface thereof, and the tip of the ring-shaped protrusion has a spherical shape that protrudes downward,
A structure of a column base supporting structure for a building, wherein a spherical portion for slidably supporting the ring-shaped protrusion is provided on the upper surface of the receiving member so as to be concave downward. Construction method. The base plate is provided with an inclination adjusting member for adjusting the inclination of the base plate in at least three locations on the outer periphery thereof so as to be detachable from the base plate,
Adjusting the inclination of the base plate and the column base by the inclination adjusting member when attaching the column base of the building on the base plate;
6. The construction method for a column base support structure for a building according to claim 5, further comprising a step of separating the inclination adjusting member from the base plate and allowing the receiving member and the base plate to slide.

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