JP2017020239A - Foundation structure and foundation construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply install a new foundation in addition to an existing foundation without the need for anchorage of bar arrangement for the existing foundation and the new foundation.SOLUTION: A foundation structure includes an already-arranged existing foundation 2 of a foundation structure 1 for supporting a building, and a new foundation 3 that is newly arranged by being connected to the existing foundation 2. The existing foundation 2 comprises a protruding member 23 that protrudes in the state of being fixed to a joint J for connecting the existing foundation 2 and the new foundation 3 together. The new foundation 3 comprises arranged bars 33, 34, 35 and 36 that are connected to the protruding member 23.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foundation structure and a foundation construction method.

Traditionally, building bearing walls are provided on foundations to support loads. In addition, earthquake-resistant walls and damping walls are also provided on the foundation to support the load.
Patent Document 1 discloses a technique related to a seismic wall, and an earthquake-resistant reinforcing structure around an opening is attached around a building opening on a foundation via a joining member.
Patent Document 2 discloses a technique related to a damping wall, and a damping device is mounted on a foundation via an anchor bolt.
That is, as described above, it is desirable that the wall or device that exhibits an excellent effect against earthquakes and vibrations be provided on the foundation in order to sufficiently exhibit the effect.

Japanese Patent No. 5427426 Japanese Patent No. 5320029

However, since the wall or device that exhibits an excellent effect against earthquakes and vibrations as described above is provided on the foundation of an existing building, for example, it cannot be introduced as it is in a place where there is no foundation. In this case, it is necessary to provide a new foundation at the place where the wall or device is to be introduced.
At this time, in order to connect the reinforcement of the new foundation to the reinforcement of the foundation of the existing building (hereinafter referred to as “existing foundation”), the existing foundation must be partially broken once and the reinforcement of the existing foundation must be exposed. However, the work becomes large and the construction cost becomes high.

  The present invention has been made in view of the above problems, and it is not necessary to fix the arrangement of the existing foundation and the new foundation, and an object thereof is to easily provide a new foundation on the existing foundation.

  In order to solve the above-mentioned problem, the invention according to claim 1 is, for example, as shown in FIGS. 1 and 2, the existing foundation 2 already arranged in the foundation structure 1 that supports a building, and the existing foundation 2. A new foundation 3 that is connected and newly arranged, and the existing foundation 2 includes a protruding member 23 that is fixed and protrudes with respect to a connection portion J to which the existing foundation 2 and the new foundation 3 are connected. The new foundation 3 includes reinforcing bars 33, 34, 35, and 36 connected to the protruding member 23.

According to the first aspect of the present invention, an existing foundation 2 that is already arranged in the foundation structure 1 that supports a building and a new foundation 3 that is newly arranged in connection with the existing foundation 2 are provided. The foundation 2 includes a protruding member 23 that is fixed and protrudes with respect to a connection portion J where the existing foundation 2 and the new foundation 3 are connected. The new foundation 3 is arranged with reinforcing bars 33, 34, and 35 connected to the protruding member 23. 36, the projecting member 23 provided at the connection portion J of the existing foundation 2 can be connected to the reinforcing bars 33, 34, 35, 36 of the new foundation 3, and the reinforcing bar of the existing foundation 2 and the new foundation 3 It is possible to obtain the same strength as when the bar arrangements 33, 34, 35 and 36 are connected and fixed.
For this reason, when the new foundation 3 is provided on the existing foundation 2, it is not necessary to destroy the existing foundation 2 once and strip the reinforcement in order to connect and arrange the reinforcing bars, and the projecting member 23 is provided on the existing foundation 2. It is possible to simply provide the new foundation 3 equivalent to the existing foundation 2 and the fixed foundation.
From the above, it is not necessary to fix the reinforcement between the existing foundation 2 and the new foundation 3, and the new foundation 3 can be easily provided on the existing foundation 2.

  In the invention according to claim 2, for example, as shown in FIGS. 1 and 2, in the basic structure according to claim 1, the reinforcing bar 33, 34, 35, 36 includes a U-shaped bar 36. It is characterized by being.

According to the invention described in claim 2, since the reinforcing bars 33, 34, 35, 36 of the new foundation 3 are provided with the U-shaped bars 36, the central portion of the U-shaped bars 36 is connected to the protruding member 23. Both ends can be connected to the upper main bar 34 and the lower main bar 35 of the new foundation 3, respectively.
Therefore, since the U-shaped bar 36 connects the protruding member 23 to the upper main bar 34 and the lower main bar 35 of the new foundation 3, the upper main bar 34, the lower main bar 35, and the protruding member 23 can be connected and fixed in series. For example, a higher shear strength can be realized as compared with the case where the protruding member 23 is connected only to either the upper main bar 34 or the lower main bar 35.

  The invention described in claim 3 is, for example, as shown in FIG. 3, in the foundation structure described in claim 1 or 2, the anchor bolt 4 provided on the new foundation 3 is attached to the foundation core BC of the new foundation 3. It is arranged, and the reinforcing bars 33, 34, 35, 36 are provided so as to be shifted from the basic core BC.

  According to the invention described in claim 3, the reinforcing bars 33, 34, 35, 36 are provided so as to be shifted from the foundation core BC of the new foundation 3, so that, for example, an earthquake resistant material or a damping material is provided on the new foundation 3. When providing, it is necessary to provide the anchor bolt 4 on the foundation core BC. However, since the reinforcing bars 33, 34, 35, 36 of the new foundation 3 are offset from the basic core BC, the anchor bolt 4 and the reinforcing bar are arranged. There is no possibility of interference with 33, 34, 35, and 36, and the anchor bolt 4 can be easily provided on the new foundation 3.

  The invention described in claim 4 is, for example, as shown in FIG. 3, in the foundation structure described in claim 3, an anchor bolt 4 is provided on the new foundation 3, and the anchor bolt 4 is connected to the new foundation 3. It is provided apart from the end portion.

  According to the invention described in claim 4, the anchor bolt 4 is provided on the new foundation 3, and the anchor bolt 4 is provided apart from the end portion of the new foundation 3. The fear that the anchor bolt 4 becomes an obstacle and the concrete cannot be sufficiently filled up to the end of the new foundation 3 can be eliminated.

  Invention of Claim 5 is a construction method of the foundation which constructs the foundation structure as described in any one of Claim 1 to 4 as shown, for example in FIGS. 1-7, Comprising: The said existing foundation 2 The projecting member 23 is fixed to the connecting portion J of the base plate, and the reinforcing bar 33, 34, 35, 36 is connected to the fixed projecting member 23 to fix the existing foundation 2 and the new foundation 3; The new foundation 3 connected to the existing foundation 2 is formed.

According to the invention described in claim 5, the protruding member 23 is fixed to the connection portion J of the existing foundation 2, and the reinforcing bar 33, 34, 35, 36 is connected to the fixed protruding member 23, thereby Since the new foundation 3 is fixed and the new foundation 3 connected to the existing foundation 2 is formed, the projecting member 23 provided in the connection portion J of the existing foundation 2 is arranged with the reinforcing bars 33, 34, 35, 36 of the new foundation 3. It is possible to connect the reinforcing bars of the existing foundation 2 and the reinforcing bars 33, 34, 35, and 36 of the newly installed foundation 3 to obtain the same strength as that obtained by connecting them.
For this reason, when the new foundation 3 is provided on the existing foundation 2, it is not necessary to destroy the existing foundation 2 once and strip the reinforcement in order to connect and arrange the reinforcing bars, and the projecting member 23 is provided on the existing foundation 2. It is possible to simply provide the new foundation 3 equivalent to the existing foundation 2 and the fixed foundation.
From the above, it is not necessary to fix the reinforcement between the existing foundation 2 and the new foundation 3, and the new foundation 3 can be easily provided on the existing foundation 2.

  According to the present invention, it is possible to fix the arrangement of a new foundation without destroying the existing foundation, and easily establish a new foundation on the existing foundation.

It is the perspective view which showed the basic structure which concerns on embodiment of this invention. It is the longitudinal section showing the basic structure concerning the embodiment of the present invention. It is the cross-sectional view which showed a part of foundation structure concerning embodiment of this invention. It is the schematic which showed the binding of the volt | bolt and U character which concern on embodiment of this invention. It is the schematic which showed the position where the anchor bolt which concerns on embodiment of this invention is provided. It is the perspective view which showed the attachment of the volt | bolt which concerns on embodiment of this invention. a) It is a schematic diagram explaining the attachment of the volt | bolt which concerns on embodiment of this invention. b) It is a schematic diagram explaining the attachment of the volt | bolt which concerns on embodiment of this invention. c) It is a schematic diagram explaining the attachment of the volt | bolt which concerns on embodiment of this invention. It is a perspective view explaining attachment of a earthquake-resistant wall concerning an embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below are provided with various technically preferable limitations for carrying out the present invention. However, the technical scope of the present invention is not limited to the following embodiments and illustrated examples. Absent.

As shown in FIGS. 1 and 2, the foundation structure 1 according to the present embodiment includes an existing foundation 2 provided in an existing house and a new foundation 3 provided at the time of renovation. The existing foundation 2 is made at an earlier stage than the new foundation 3, and the new foundation 3 is connected to the existing foundation 2 later.
The early stage here means that the existing foundation 2 is formed before the new foundation 3 in terms of time, and is not limited at the time of renovation. For example, the construction time difference between the existing foundation 2 and the new foundation 3 such as a design change at the construction stage of a new house may be short or long.

  The existing foundation 2 is a concrete member (a so-called cloth foundation) having a substantially inverted T-shaped cross section provided along the outer periphery of the building. And a rise 22 that rises vertically from the approximate center to the upper side.

The new foundation 3 has substantially the same shape as the existing foundation 2 and includes a new footing 31 in contact with the ground and a new rising 32 that rises from the approximate center of the new footing 31 and is perpendicular to the extending direction of the existing foundation 2. Connected to the existing foundation 2.
The new foundation 3 is provided such that the new footing 31 is embedded under the existing footing 21, and the upper surface of the end of the new footing 31 is in contact with the lower surface of the existing footing 21.

Further, at the connection portion J where the existing foundation 2 and the new foundation 3 are connected, a part of the existing footing 21 of the existing foundation 2 is removed so as to be flush with the existing rising 22. In the connection portion J where the existing footing 21 and the existing rising 22 are continuous, a plurality of bolts 23 are provided on the same vertical line as projecting members provided horizontally toward the new foundation 3.
Moreover, the volt | bolt 23 is a hexagonal volt | bolt and the thing whose diameter is about 20 mm is used.

  Further, the bolt 23 is fixed by being embedded in the existing rising 22 at a depth of 80 mm. As shown in FIG. 3, the thickness dimension of the existing rising 22 is 120 mm. In order to stably fix the bolt 23 to the existing foundation 2, a majority of the thickness dimension (60 mm or more) is embedded. Is preferred. On the other hand, when the thickness is about 70 mm, construction errors may occur due to field practice, and the embedded size may be substantially less than a majority. For this reason, it is still more preferable to set the embedding size to about 80 mm.

  Moreover, about the protrusion dimension from the connection part J, 50 mm or more is preferable. If it is less than 50 mm, it may be difficult to fix the connection with the reinforcing bar when constructing the new foundation 3, or the concrete may not sufficiently flow into the connecting part J when placing concrete. This is because there is a risk of causing it.

Further, the plurality of bolts 23 provided separately on the same line are arranged with an interval of 140 mm to 150 mm.
For example, if the bolts 23 are arranged closer than 140 mm, the stress is not distributed to the respective bolts 23 and the stress may be concentrated on the specific bolts 23.
On the other hand, when the bolts 23 are arranged farther than 150 mm, the number of the bolts 23 is reduced with respect to the connection portion J, and the stress related to one part of the bolts 23 is increased, so that the existing foundation 2 and the new foundation 3 May not be sufficiently connected to each other.
For this reason, it is preferable that the space | interval of the volt | bolt 23 shall be 140 mm-150 mm.

The new foundation 3 is provided with a stirrup 33, an upper main bar 34, a lower main bar 35, and a U-shaped bar as reinforcing bars.
The streaks 33 extend in the vertical direction from the newly established start 32 to the newly installed footing 31, and are provided in a plurality spaced apart in the extending direction of the newly installed foundation 3.
The upper end main bar 34 connects the upper ends of the ribs 33 along the horizontal direction.
The lower end main bar 35 connects the lower ends of the ribs 33 along the horizontal direction.
Further, the U-shaped line 36 connects the ends of the upper and lower main bars 34 and 35 on the connection part J side from the connection part J side.

Both ends of the U-shaped bar 36 are connected to the upper main bar 34 and the lower main bar 35, respectively, and an intermediate portion not connected to each of the U-shaped bars 36 is connected to the bolts 23 arranged in a line in the connection portion J of the existing foundation 2. It is fixed.
Further, the U-shaped bar 36 is connected and fixed to the bolt 23 so that the bolt 23 is arranged between the horizontal part connected to the upper main bar 34 and the horizontal part connected to the lower main bar 35 in the vertical direction. . That is, the bolt 23 is disposed below the upper main bar 34 and above the lower main bar 35.
In this way, the existing foundation 2 and the new foundation 3 are connected and fixed to the bolts 23 and the U-shaped bars 36, so that the reinforcements of the existing foundation 2 and the new foundation 3 are arranged (not shown in the existing foundation 2). Are also fixed integrally in the same manner as in the case of connecting and fixing the same streaks, upper main bars and lower main bars as in the new foundation 3).

Further, as shown in FIG. 3, the ribs 33, the upper main bar 34, and the lower main bar 35 provided on the new foundation 3 are provided so as to be shifted in parallel from the foundation core BC of the new foundation 3. Specifically, the stirrup 33 is provided so as to be in contact with the foundation core BC, and the upper main bar 34 and the lower end main bar 35 are provided so as to be in contact with the rib 33 which is in contact with the foundation core BC from the opposite side.
An anchor bolt 4 is provided on the foundation core BC. The anchor bolt 4 is provided at a position spaced from the end of the new foundation 3 on the connecting portion J side.

Further, as shown in FIG. 4, the bolt 23 is located on an extension line of the basic core BC of the new foundation 3 and is connected to a U-shaped line 36 that is provided so as to be shifted from the basic core BC.
The bolt 23 and the U-shaped line 36 are fixed by abutting the U-shaped line 36 vertically on the horizontal bolt 23 and fastening the abutted portion with a wire.
In addition, the fixing portion is located on the existing rising 22 side from the large-diameter bolt head provided at the projecting tip of the bolt 23. For this reason, even if the bolt 23 and the U-shaped line 36 are misaligned, the U-shaped line 36 is locked to the large-diameter bolt head. The connected state is maintained.

As shown in FIG. 8, the vibration damping device 5 provided on the new foundation 3 includes a vibration damping structure 51 that is displaced in a direction opposite to the displacement of the building 6 due to the seismic force, and the vibration damping structure 51 is attached to the building. 6 is provided.
The vibration damping device assembly 52 is a gate-shaped member, and includes an upper beam 52a disposed along the ceiling beam 61 of the building 6 and two pieces fixed to the end portions of the upper beam 52a. And a column 52b.
In addition, a fixing tool 52c is provided at the lower ends of the two pillars 52b to be fixed on the base 62 arranged along the new foundation 3. And the front-end | tip of the anchor bolt 4 provided in the new foundation 3 penetrates the base 62, and protrudes to the upper side, and the damping device 5 is fixed by fixing the front-end | tip of this anchor bolt 4 and the fixing tool 52c. It is provided on the new foundation 3.

A method for constructing the new foundation 3 will be described below.
First, the pretreatment of the existing foundation 2 will be described.
In order to prevent interference with the new foundation 3, the portion corresponding to the connecting portion J of the existing footing 21 is demolished to be flush with the existing rising 22.
Thereafter, as shown in FIG. 6, the connecting portion J which is a continuous surface of the existing footing 21 and the existing rising 22 is roughened using sandpaper or the like.

Next, a method for attaching the bolt 23 to the existing foundation 2 will be described.
As shown in FIG. 7 a), the bolts 23 are attached to the existing foundation 2 using a hammer drill HD and a drill bit DB so that the bolts 23 protrude from the connection portion J roughened on the existing foundation 2. Drilled to a predetermined depth.
As shown in FIG. 7b), after drilling, the chips accumulated in the hole are blown out from the hole by the wind pressure by the dust pump DP, and then the inner wall of the hole is brushed with a brush B or the like as shown in FIG. 7c). Polish to remove chips finely.
Thereafter, when the bolts 23 are inserted into the holes, an adhesive (urethane methacrylic resin adhesive) is filled to such an extent that the bolts 23 overflow, and the bolts 23 are inserted therein and allowed to stand until the adhesive is cured. Is fixed to the existing foundation 2. That is, the bolt 23 has a function as a so-called chemical anchor.

Next, a method for forming the new foundation 3 will be described.
In the formation of the new foundation 3, first, in the connection portion J, the formwork is installed so that the new footing 31 enters under the existing footing 21.
After the formwork is installed, the stirrup 33, the upper main bar 34, the lower main bar 35, and the U-shaped bar 36 that serve as the reinforcement of the new foundation 3 are installed in the mold. At this time, the bar arrangement is shifted from the base core BC so as not to interfere with the anchor bolts 4 provided on the base core BC of the new foundation 3. Further, the U-shaped line 36 is connected and fixed at both ends at the connection part J side of the upper end main bar 34 and the lower end main bar 35, respectively. Then, the U-shaped line 36 is connected and fixed to the plurality of bolts 23 at an intermediate portion protruding toward the connecting portion J side.

Thereafter, the anchor bolt 4 is disposed on the foundation core BC of the new foundation 3. At this time, as shown in FIG. 5, the anchor bolt 41 is provided between the stirrups 33 arranged in parallel with the extending direction of the new foundation 3. Further, in the case of interfering with the stirrup 33 like the anchor bolt 42, the interfering stirrup 33 is removed and both sides of the anchor bolt 42 (both sides along the length direction of the main muscles 34 and 35). Two streaks 33 are provided at intervals.
Thereafter, a new foundation 3 connected to the existing foundation 2 is formed by placing concrete in the mold.

Finally, as shown in FIG. 8, a base 62 is provided on the new foundation 3, and the pillar 52b of the vibration damper assembly 52 is fixed to the anchor bolt 4 via the fixture 52c on the base 62. Thus, the vibration damping device assembly 52 is fixed to the building 6.
And the damping device 5 is provided in the building 6 by attaching the damping structure 51 to this damping device built-in body 52.

  As described above, according to the present embodiment, as shown in FIGS. 1 and 2, the existing foundation 2 that is already arranged in the foundation structure 1 that supports the building, and the existing foundation 2 are newly connected. A new foundation 3 to be arranged, and the existing foundation 2 is provided with a bolt 23 that is fixed and protrudes with respect to a connecting portion J to which the existing foundation 2 and the new foundation 3 are connected. A U-shaped line 36 to be connected is provided.

By doing so, the bolt 23 provided at the connection portion J of the existing foundation 2 can be connected to the U-shaped bar 36 of the new foundation 3, and the reinforcement of the existing foundation 2 and the reinforcement of the new foundation 3 are connected. The same strength as that obtained by fixing can be obtained.
For this reason, when providing the new foundation 3 on the existing foundation 2, it is not necessary to destroy the existing foundation 2 once and strip the reinforcement in order to connect and fix the reinforcements, and the existing foundation 2 is provided with the bolts 23. The new foundation 3 equivalent to the existing foundation 2 and the established foundation can be simply provided.
From the above, it is not necessary to fix the reinforcement between the existing foundation 2 and the new foundation 3, and the new foundation 3 can be easily provided on the existing foundation 2.

In the present embodiment, the U-shaped bar 36 of the new foundation 3 is fixed to the bolt 23 of the existing foundation 2.
By doing so, an intermediate portion of the U-shaped bar 36 can be connected to the bolt 23 and both ends can be connected to the upper main bar 34 and the lower main bar 35 of the new foundation 3, respectively.
For this reason, since the U-shaped bar 36 connects the bolt 23 to the upper main bar 34 and the lower main bar 35 of the new foundation 3, the upper main bar 34, the lower main bar 35 and the bolt 23 can be connected and fixed in series. As compared with the case where the bolt 23 is connected only to either the upper main bar 34 or the lower main bar 35, a higher shear strength can be realized.

In the present embodiment, the stirrup 33, the upper main bar 34, and the lower main bar 35 are provided so as to be shifted from the foundation core BC of the new foundation 3.
In this way, for example, when providing an anti-seismic material or damping material on the new foundation 3, it is necessary to provide the anchor bolt 4 on the foundation core BC, but the reinforcement of the new foundation 3 is displaced from the foundation core BC. Therefore, there is no fear that the anchor bolt 4 and the reinforcing bar interfere with each other, and the anchor bolt 4 can be easily provided on the new foundation 3.

Further, in the present embodiment, the anchor bolt 4 is provided on the new foundation 3, and the anchor bolt 4 is provided apart from the end portion of the new foundation 3.
By doing so, it is possible to eliminate the risk that the anchor bolt 4 becomes an obstacle when the new foundation 3 is filled with concrete and the concrete cannot be sufficiently filled to the end of the new foundation 3.

Moreover, in this embodiment, the bolt 23 is fixed to the connection part J of the existing foundation 2, and the existing foundation 2 and the new foundation 3 are fixed by connecting the U-shaped bar 36 to the fixed bolt 23. To form a new foundation 3 connected to.
By doing so, the bolt 23 provided at the connection portion J of the existing foundation 2 can be connected to the U-shaped bar 36 of the new foundation 3, and the reinforcement of the existing foundation 2 and the reinforcement of the new foundation 3 are connected. The same strength as that obtained by fixing can be obtained.
For this reason, when providing the new foundation 3 on the existing foundation 2, it is not necessary to destroy the existing foundation 2 once and strip the reinforcement in order to connect and fix the reinforcements, and the existing foundation 2 is provided with the bolts 23. The new foundation 3 equivalent to the existing foundation 2 and the established foundation can be simply provided.
From the above, it is not necessary to fix the reinforcement between the existing foundation 2 and the new foundation 3, and the new foundation 3 can be easily provided on the existing foundation 2.

In the present embodiment, the connecting portion J of the existing foundation 2 is roughened.
By doing so, when the concrete of the new foundation 3 is placed, the surface of the connecting portion J is rough, so that the concrete of the new foundation 3 can be well bonded to the concrete of the existing foundation 2.

Moreover, in this embodiment, the volt | bolt 23 shall be embed | buried and fixed to the depth 80mm with respect to the existing standing | starting-up 22 whose thickness dimension is 120 mm.
By doing so, it is possible to embed a majority dimension of the thickness of the existing rise 22 and to fix the bolt 23 to the existing foundation 2 stably.

Moreover, in this embodiment, the volt | bolt 23 protruded from the connection part J 50 mm or more.
By carrying out like this, when constructing the new foundation 3 like the case where a protrusion dimension is less than 50 mm, for example, the possibility that connection fixation with a reinforcement becomes difficult can be eliminated.
Furthermore, since the protruding dimension is 50 mm or more, the U-shaped streaks 36 and the like are concentrated in the vicinity of the connection portion J, and the possibility that the concrete does not sufficiently flow into the connection portion J when placing concrete is eliminated. Can do.

Further, in the present embodiment, a plurality of bolts 23 provided on the same line and spaced apart are arranged with an interval of 140 mm to 150 mm.
In this way, for example, when the bolts 23 are arranged closer than 140 mm, the stress is not distributed to the respective bolts 23, and the risk that the stress concentrates on the specific bolts 23 is eliminated. be able to.
Further, when the bolts 23 are arranged farther than 150 mm, the number of the bolts 23 is reduced with respect to the connection portion J, and the stress related to one place of the bolts 23 is increased. The fear that the foundation 3 is not sufficiently stably connected can be eliminated.

In the present embodiment, the U-shaped bar 36 and the bolt 23 are tightly connected to the existing rising 22 side of the large-diameter bolt head provided at the projecting tip of the bolt 23.
By doing so, even if the bolt 23 and the U-shaped line 36 are misaligned, the U-shaped line 36 is locked to the large-diameter bolt head. The connection state with 36 can be maintained.

As mentioned above, although this invention was concretely demonstrated based on embodiment, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.
In the present embodiment, the vibration damping device is provided on the new foundation 3. However, the present invention is not limited thereto, and for example, an earthquake resistant device or a load bearing wall may be provided.

  In the present embodiment, the bolt 23 is provided at the connection portion J of the existing foundation 2. However, the present invention is not limited to this, and for example, a hook-shaped member is engaged with the U-shaped line 36 and fixed with a wire or the like. In addition, the end of the U-shaped object may be fixed to the existing foundation 2 and the U-shaped line 36 may be inserted into the semicircular or semi-elliptical protrusion, and the U-shaped line 36 can be fixed. Any one is acceptable.

  In the present embodiment, the new foundation 3 is formed when the building 6 is reformed. However, the present invention is not limited to this. For example, a design change at the construction stage of a new house may be performed. As long as 3 is formed, the time difference may be short or long.

Moreover, in this embodiment, when forming the new foundation 3, although concrete was cast in a construction site using a formwork, it is not restricted to this.
For example, a so-called precast concrete foundation in which a portion other than the portion where the U-shaped line 36 protrudes toward the connecting portion J side is formed in advance in a factory or the like may be used. In this case, the U-shaped bar 36 is connected and fixed to the bolt 23 at the construction site, and the new foundation 3 is formed by placing the concrete in the place.

Further, in this embodiment, the portion corresponding to the connection portion J of the existing footing 21 is torn down so as to be flush with the existing rising 22, but this is not limiting, for example, without breaking the existing footing 21. It is good also as a shape which notches the new foundation 3 side by the part.
By carrying out like this, the man-hour of the pretreatment of the existing foundation 2 can be reduced, and the new foundation 3 can be formed more easily.

DESCRIPTION OF SYMBOLS 1 Foundation structure 2 Existing foundation 3 New foundation 4 Anchor bolt 5 Damping device 6 Building 21 Existing footing 22 Existing rising 23 Bolt (projecting member)
31 New footing 32 New start-up 33 Stirrup (bar arrangement)
34 Top main bar (reinforcement)
35 Lower main bar (reinforcement)
36 U-shaped (reinforcement)
41 Anchor Bolt 42 Anchor Bolt 51 Damping Structure 52 Damping Device Assembly 52a Upper Beam 52b Column 52c Fixing 61 Ceiling Beam 62 Base B Brush BC Core Core DB Drill Bit DP Dust Pump HD Hammer Drill J Connection Portion

Claims (5)

Of the foundation structures that support the building,
A new foundation newly connected to the existing foundation, and
The existing foundation includes a protruding member that is fixed and protrudes with respect to a connection portion that connects the existing foundation and the new foundation.
The new foundation includes a reinforcing bar connected to the protruding member. The basic structure according to claim 1,
A basic structure characterized in that the bar arrangement includes a U-shaped line. In the basic structure according to claim 1 or 2,
Anchor bolts provided on the new foundation are arranged on the foundation core of the new foundation,
A foundation structure characterized in that the bar arrangement is provided off the foundation core. In the basic structure according to claim 3,
Anchor bolts are provided on the new foundation,
The foundation structure characterized in that the anchor bolt is provided apart from an end of the new foundation. A foundation construction method for constructing the foundation structure according to any one of claims 1 to 4,
Fixing the protruding member to the connecting portion of the existing foundation;
By fixing the existing foundation and the new foundation by connecting the reinforcing bar to the fixed projecting member,
A foundation construction method comprising forming the new foundation connected to the existing foundation.

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