JP6867176B2 - Foundation structure of the building - Google Patents

Description

The present disclosure relates to the foundation structure of a building.

As a foundation structure of a building, a structure is known in which the lower part of a building placed on the upper surface of the foundation via a foundation packing is fixed to the foundation by an anchor bolt that is raised from the foundation and passes through a through hole of the foundation packing. (See, for example, Patent Document 1 and Patent Document 2).

The conventional foundation structure described in Patent Document 1 has a structure in which a tubular grout and a holding material for injecting and holding a grout of a curable liquid filler are provided around an anchor bolt inside a through hole of the foundation packing. ing.
With this foundation structure, when a building moves relative to the horizontal direction due to a horizontal force such as an earthquake or a typhoon, it is possible to prevent a large bending stress from acting on a portion protruding from the foundation of the anchor bolt due to the solidified grout.

Further, in the conventional foundation structure described in Patent Document 2, the spring wound around the anchor bolt and the upper surface of the foundation are formed between the fixing ring body on the upper portion of the anchor bolt inserted into the base of the building and the foundation. It has a structure in which a rotor is provided between the discs and the discs that are in contact with each other.
In this foundation structure, the weight of the base and the vertical sway can be absorbed and relaxed by being dispersed by the spring and a plurality of rotors without being directly received by the anchor bolts.

Japanese Patent No. 591001 Japanese Unexamined Patent Publication No. 2013-76243

However, in the structure in which the base end portion of the anchor bolt described in Patent Document 1 is held by the grout, the grout is affected by the weather and the season (temperature, humidity). In addition, advanced technology is required, and it takes time and effort accordingly.

Further, in the technique described in Patent Document 2, since the anchor bolt is elastically supported, sufficient rigidity cannot be obtained when a large bending stress is applied to the anchor bolt.

In the present disclosure, in a structure in which the lower part of a building is elastically supported by foundation packing and fixed by anchor bolts raised from the foundation, the performance of suppressing a large bending stress from acting on the anchor bolts is stably ensured. The purpose is to provide a possible building foundation structure.

In the foundation structure of the building of the present disclosure, the lower part of the building placed on the upper surface of the foundation via the foundation packing is fixed to the foundation by an anchor bolt raised from the foundation through a through hole of the foundation packing. A rigid fastening member is fastened to the anchor bolt in a state of contact with the upper surface of the foundation at the base end portion of the portion of the anchor bolt raised from the foundation in the foundation structure of the building. It is the foundation structure of the building.

The fastening member preferably includes a fastening member main body and a washer having a larger horizontal area than the fastening member main body.
Further, the washer is preferably a square washer.
The fastening member is preferably formed at the same height as the foundation packing.

Therefore, in the basic structure of the building of the present disclosure, when a force is applied to the anchor bolt in the shearing direction, the fastening member is reinforced and it is possible to suppress the action of a large bending stress. In addition, the structure for fastening the fastening member to the anchor bolt stabilizes the fastening strength and stabilizes the performance of suppressing the action of a large bending stress on the anchor bolt, as compared with the case of using a wet grout. Can be secured.

Further, when the fastening member is provided with a washer, the performance of suppressing the action of bending stress on the anchor bolt can be obtained at low cost as compared with the case where the fastening member main body is large.
Further, when the washer is a square washer, the cost can be reduced as compared with the case where a flat washer is used.
When the fastening member is formed at the same height as the foundation packing, the maximum fastening strength is obtained in the limited space between the foundation and the base, and a high bending stress on the anchor bolt is obtained. Action suppression performance can be obtained.

It is sectional drawing which shows the outer peripheral part of the lower part of the unit building in the foundation structure of the building of Embodiment 1 of this invention. It is sectional drawing which shows the inner part of the lower part of a unit building in the foundation structure of the building of Embodiment 1 of this invention. It is a top view which shows the foundation packing used for the foundation structure of the building of Embodiment 1 of this invention. It is a side view which shows the foundation packing used for the foundation structure of the building of Embodiment 1 of this invention. It is a perspective view which looked at the foundation packing used for the foundation structure of the building of Embodiment 1 of this invention from the bottom side. It is sectional drawing which shows the outline of the place where the anchor bolt of the foundation structure of the building of Embodiment 1 of this invention was raised. It is a top view of the main part of the part where the anchor bolt of the foundation structure of the building of Embodiment 1 of this invention was raised. It is sectional drawing which shows the outline of the place where the anchor bolt of the foundation structure of the building of Embodiment 2 of this invention was raised.

Hereinafter, a mode for implementing the foundation structure of the building of the present disclosure will be described with reference to the drawings.
(Embodiment 1)
The configuration of the foundation structure of the building of the first embodiment will be described below with reference to the drawings.
[overall structure]
First, the overall configuration will be described.
FIG. 1A is a cross-sectional view showing an outer peripheral portion of the lower portion of the unit building 100 to which the foundation structure of the building of the first embodiment is applied, and FIG. 1B is a cross-sectional view showing an inner portion of the lower portion of the unit building 100.

As shown in FIGS. 1A and 1B, the lower portion of the building unit 100a constituting the unit building 100 is supported by the concrete foundation 10.
As shown in FIG. 1B, the unit building 100 is constructed by arranging a plurality of building units 100a and 100a adjacent to each other in the horizontal direction. Further, each building unit 100a is, for example, a wooden building unit, and is configured by erecting a wall panel 112 on the outer edge of the floor panel 111, and a base 113 is provided on the outer periphery of the lower surface of the floor panel 111.

The foundation 10 includes an outer peripheral foundation 11 shown in FIG. 1A provided along the outer periphery of the unit building 100, and an inner foundation 12 shown in FIG. 1B installed inside surrounded by the outer peripheral foundation 11. Further, anchor bolts 20 are raised from the upper surfaces 11a and 12a of the outer peripheral foundation 11 and the inner foundation 12, and the base 113 is fixed to the upper portion thereof. The lower portions (not shown) of the anchor bolts 20 are embedded in the foundations 11 and 12, and a plurality of anchor bolts 20 are provided at predetermined intervals in the longitudinal direction of the foundations 11 and 12.

Further, a foundation packing 30 is interposed between the upper surface 11a of the outer peripheral foundation 11 and the lower surface 113a of the base 113 of the unit building 100.
The foundation packing 30 has elasticity, and by interposing the foundation packing 30 between the outer peripheral foundation 11 and the foundation 113, the foundation 10 moves up and down from the foundation 10 to the unit building 100, and conversely, the unit building 100 moves up and down from the foundation 10. -It has a support structure that absorbs and mitigates lateral vibration.

(Structure of foundation packing)
Next, the configuration of the foundation packing 30 will be described.
2A is a plan view of the foundation packing 30, FIG. 2B is a side view of the foundation packing 30, and FIG. 2C is a perspective view of the foundation packing 30 as viewed from the bottom surface 30a side.
As shown in FIGS. 2A and 2B, the foundation packing 30 is a thin plate long member having a thickness t of about 10 to 30 mm, a width L of about 70 to 200 mm, and a length of about 500 to 2000 mm. .. The foundation packing 30 is continuously connected in series along the longitudinal direction of the outer peripheral foundation 11, and in some cases, is appropriately cut and installed.

As described above, the foundation packing 30 has a certain degree of elasticity, and as the material thereof, for example, synthetic resin, rubber, metal, ceramic, or the like can be used. As such a basic packing 30, for example, those described in JP-A-2003-301532, JP-A-2005-330798, Patent No. 5199001 and the like can be adopted.

Further, the foundation packing 30 is installed by adhering to the upper surface 11a of the outer peripheral foundation 11 of the foundation 10, and as shown in FIG. 2C, the adhesive 34 is applied to a plurality of locations on the bottom surface 30a of the foundation packing 30. , Adhere to the upper surface 11a.

The foundation packing 30 is formed with a large number of ventilation holes 31 that allow ventilation in the width direction of the foundation packing 30. The ventilation hole 31 is formed with an opening portion 32 on either the upper or lower side. Further, in the foundation packing 30, square through holes 33 for passing the anchor bolts 20 are formed in the central portion in the width direction at regular intervals over the entire length.

Since the foundation packing 30 is formed with a large number of ventilation holes 31, air can flow through the ventilation holes 31 between the underfloor portion inside the foundation 10 and the outside of the foundation 10. Underfloor ventilation can be achieved. Further, since either the upper surface or the lower surface of the ventilation hole 31 has an open shape, it is highly breathable and the contact surface of the foundation 10 or the base 113 of the unit building 100 can be dried.

(Anchor bolt configuration)
Next, the configuration of the anchor bolt 20 will be described.
As shown in FIGS. 1A and 1B, the anchor bolts 20 are raised from the outer peripheral foundations 11 of the foundation 10 and the upper surfaces 11a and 12a of the inner foundations 12, and the anchor bolts 20 are raised from the upper surfaces 11a and 12a of the foundations 11 and 12 in the longitudinal direction. Multiple installations are made at predetermined intervals. Then, in the outer peripheral foundation 11 provided with the foundation packing 30, the relative positions of the anchor bolts 20 are set so as to penetrate the through holes 33 of the foundation packing 30.

FIG. 3A is a cross-sectional view showing an outline of an installation location of the anchor bolt 20. Further, FIG. 3B is a plan view of a main part of the portion where the anchor bolt 20 is raised as viewed from above.
As shown in FIG. 3A, a nut 21 as a fastening member main body is fastened to the base end portion of the anchor bolt 20 raised from the upper surface 11a of the outer peripheral foundation 11. As shown in FIG. 3B, the nut 21 is hexagonal in the first embodiment.

Further, as shown in FIG. 3A, a square washer 22 is interposed between the nut 21 and the upper surface 11a of the outer peripheral foundation 11.
As shown in FIG. 3B, the square washer 22 has a rectangular shape that is long in the extending direction (left-right direction in the figure) of the foundation packing 30 when viewed from above, and is formed in a size that can be installed inside the through hole 33. And has an area larger than the area of the bottom surface and the top surface of the nut 21. The square washer 22 is installed so that the direction along the long side thereof is the extending direction of the foundation packing 30.
Further, the nut 21 and the square washer 22 are joined by welding at a plurality of locations.

(Construction method)
Next, the construction method of the foundation structure of the building will be described step by step below.
a) Anchor bolts 20 are raised from the outer peripheral foundation 11 of the foundation 10 and the upper surfaces 11a and 12a of the inner foundation 12, and the anchor bolts 20 are embedded in the outer peripheral foundation 11 and the inner foundation 12 for installation.
b) After inserting the square washer 22 into the anchor bolt 20, the nut 21 is fastened to the anchor bolt 20. At this time, the nut 21 is fastened until the square washer 22 is pressed against the upper surface 11a of the outer peripheral foundation 11. Further, the nut 21 is welded to the square washer 22.

c) An adhesive 34 is applied to a plurality of locations on the bottom surface 30a of the foundation packing 30 (see FIG. 2C), and the bottom surface 30a of the foundation packing 30 is placed on the top surface 11a of the outer peripheral foundation 11 of the foundation 10. Glue. At this time, the anchor bolt 20 is installed while adjusting the position of the foundation packing 30 so as to penetrate the through hole 33 of the foundation packing 30.
d) Fix the base 113 to the anchor bolt 20.

(Action of Embodiment 1)
In the foundation structure of the building of the first embodiment configured as described above, the vertical and lateral vibrations transmitted from the foundation 10 to the unit building 100 due to an earthquake or the like are absorbed and mitigated by the foundation packing 30. To.
Similarly, the vertical and lateral vibrations transmitted from the unit building 100 to the foundation 10 due to a typhoon or the like are also absorbed and mitigated by the foundation packing 30.

When an external force is applied to the anchor bolt 20 in the shearing direction during vibration transmission between the foundation 10 and the unit building 100, the nut 21 and the square washer 22 are reinforced, and the portion of the anchor bolt 20 protruding from the outer peripheral foundation 11. It is possible to suppress the action of a large bending stress on the bolt.

In this case, since the square washer 22 having a larger area than the nut 21 is interposed between the nut 21 and the outer peripheral foundation 11, the anchor bolt 20 is input in the shearing direction rather than the structure with only the nut 21. High reinforcement can be obtained.

Further, in the structure in which the square washer 22 is interposed between the outer peripheral foundation 11 and the nut 21 is fastened to the anchor bolt 20, a stable fastening force can be obtained without requiring labor as compared with using a wet grout. be able to. As a result, the performance of suppressing the action of bending stress on the anchor bolt 20 can be stably obtained.
Further, the square washer 22 is cheaper than the disk-shaped flat washer and can reduce the cost, and it is easy to set the area larger than the flat washer, so that a high reinforcing effect can be obtained. it can.

(Effect of Embodiment 1)
The effects of the foundation structure of the building of the first embodiment are listed below.
1) The foundation structure of the building of the first embodiment is
Anchor that the foundation 113 as the lower part of the unit building 100 placed on the upper surface 11a of the outer peripheral foundation 11 of the foundation 10 via the foundation packing 30 is raised from the outer peripheral foundation 11 through the through hole 33 of the foundation packing 30. It is the foundation structure of a building fixed to the foundation 10 by bolts 20.
A nut 21 and a square washer 22 as a rigid fastening member are attached to the anchor bolt 20 in contact with the upper surface 11a of the outer peripheral foundation 11 at the base end portion of the portion of the anchor bolt 20 raised from the outer peripheral foundation 11. It is characterized by being fastened.
Therefore, when a shearing force is applied to the anchor bolt 20, the nut 21 and the square washer 22 are reinforced, and it is possible to suppress the action of a large bending stress on the anchor bolt 20. Further, the structure for fastening the nut 21 to the anchor bolt 20 can stably obtain the fastening force for the anchor bolt 20, and the action of the bending stress on the anchor bolt 20 is compared with the case where a wet grout is used. Suppression performance can be obtained stably.

2) The foundation structure of the building of the first embodiment is
The fastening member fastened to the anchor bolt 20 is characterized by including a nut 21 as a fastening member main body and a square washer 22 as a washer having a larger area facing the outer peripheral foundation 11 than the nut 21.
Therefore, as compared with the case where the nut 21 is fastened alone, a higher reinforcing effect can be obtained when the load is input to the anchor bolt 20 in the shearing direction, and the nut 21 itself is made larger in order to obtain the same reinforcing effect. It is possible to reduce the cost as compared with the one that is used.

3) The foundation structure of the building of the first embodiment is
It is characterized in that a square washer 22 is used as a washer.
Therefore, it can be constructed at a lower cost as compared with a washer using a disk-shaped flat washer.

4) The foundation structure of the building of the first embodiment is
The nut 21 and the square washer 22 as the fastening member are formed at the same height as the foundation packing 30.
Therefore, the maximum support rigidity can be obtained in the limited space between the outer peripheral foundation 11 and the base 113.

(Embodiment 2)
Next, the foundation structure of the building of the second embodiment will be described.
Since the foundation structure of the building of the second embodiment is a modification of the first embodiment, only the differences from the first embodiment will be described.

FIG. 4 is a cross-sectional view showing an outline of a portion where the anchor bolt 20, which is a main part of the foundation structure of the building of the second embodiment, is raised.

As shown in FIG. 4, in the second embodiment, only the nut 221 is fastened to the base end portion of the anchor bolt 20. The outer diameter of the nut 221 is formed to be the same as the diagonal dimension of the square washer 22 of the first embodiment.

Therefore, even in the second embodiment, the same reinforcing effect as in the first embodiment can be obtained with respect to the input of the shear direction to the anchor bolt 20.
Further, in the second embodiment, as compared with the first embodiment, the work of attaching the square washer 22 to the anchor bolt 20 and the work of welding the nut 21 and the square washer 22 can be omitted, and the work is simplified. Can be transformed into.

Although the basic structure of the building of the present disclosure has been described based on the embodiments, the specific configuration is not limited to these embodiments, and the inventions according to the claims. Design changes and additions are permitted as long as they do not deviate from the gist of.

For example, in the embodiment, the unit building is shown as a building, but the present invention is not limited to this, and it can be applied to other buildings such as a building by a conventional construction method.
Further, as the fastening member, only the nut, the nut and the square washer are shown, but the present invention is not limited to this, and as the washer, a washer other than the square washer such as a flat washer can be used. Further, the shape of the nut is not limited to a hexagon as long as it can be fastened to the anchor bolt, and other polygonal shapes or an annular shape can be used.
Further, in the embodiment, the nut as a fastening member and the vertical dimension of the nut and the square washer are shown to be the same as the height of the foundation packing, but the present invention is not limited to this. It is possible to obtain the desired effect even if it is lower than the height.

10 Foundation 11 Outer foundation 11a Top surface 20 Anchor bolt 21 Nut (fastening member: fastening member body)
22 Square washer (fastening member: washer)
30 Foundation packing 33 Through hole 100 Unit building (building)
113 foundation (bottom of building)
221 nut (fastening member)

Claims (4)

The lower part of the building placed on the upper surface of the foundation via the foundation packing is the foundation structure of the building fixed to the foundation by anchor bolts raised from the foundation through the through holes of the foundation packing. ,
The foundation packing is formed in a long thin plate shape, through holes through which the anchor bolts pass are formed at regular intervals, and are continuously provided along the upper surface of the foundation.
A building characterized in that a rigid fastening member is fastened to the anchor bolt until it is pressed against the upper surface of the foundation at a base end portion of a portion of the anchor bolt raised from the foundation. Foundation structure. In the foundation structure of the building according to claim 1,
The through hole is formed in a quadrangular shape.
The fastening member, the fastening member body and the foundation structure of the building, characterized in that it comprises a said base area facing is not wide in the square washer than the fastening member body. In the foundation structure of the building according to claim 2.
The square washer is a basic structure of a building, characterized in that it is welded to the fastening member main body. In the foundation structure of the building according to any one of claims 1 to 3.
The foundation structure of a building, wherein the fastening member is formed at the same height as the foundation packing.

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