JP2015034436A - Rebuilding method for new building, and new building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rebuilding method for a new building, which is not affected by a planar outer shape of an underground exterior wall of an underground structure of an existing building, and the new building.SOLUTION: A rebuilding method for a new building includes the steps of: leaving an underground exterior wall 18 and underground batholith 19, which serve as a filler infilling part 17, by partially demolishing an existing underground structure; constructing foundation ground 24 by infilling a filler 20 into the filler infilling part 17; and constructing a foundation part 13 of the new building 10, which at least partially protrudes to the outside with respect to an outer edge of the underground exterior wall 18, on the foundation ground 24.

Description

  The present invention relates to a rebuilding method for a new building and a new building.

Conventionally, when rebuilding an existing building with an underground structure, the existing building including the underground structure is dismantled, and the waste material is removed before building a new building. However, dismantling of underground structures and removal of waste materials are accompanied by problems such as generation of noise and vibration and securing of a waste material treatment site, as well as a great expense.
Here, when the foundation bottom of the new building (the bottom of the foundation) is constructed at a position shallower than the foundation bottom of the existing building, the costs associated with dismantling of underground structures and removal of waste materials are reduced, and noise and vibration are reduced. There has been proposed a technique for reducing problems such as generation and securing of a waste material treatment plant (Patent Document 1).

  The technology related to the rebuilding method for a new building described in Patent Document 1 includes a process of demolishing an underground structure leaving an underground outer wall and an underground floor of an old building (existing building), an underground outer wall and an underground Filling the inside of the base with a filler, forming a foundation ground that supports a new building (new building), and forming a foundation of the new building on the formed foundation ground Yes.

JP-A-11-350746

  However, according to the technique described in Patent Document 1, an underground structure of a new building is formed inside the outer wall of the old building. That is, it is not considered to construct a new building having a larger planar outer shape than the underground structure of the old building.

  In view of the above-described facts, an object of the present invention is to provide a rebuilding method for a new building and a new building that are not affected by the planar outer shape of the underground outer wall of the underground structure of the existing building.

  The rebuilding method for a new building according to the invention described in claim 1 includes a step of partially dismantling an existing underground structure to leave a basement outer wall and a basement floor serving as a filler filling portion, and the filler filling portion. Filling a filler to construct a foundation ground, and constructing a foundation of a new building on the foundation ground, at least part of which protrudes outside the outer edge of the underground outer wall. It is said.

According to the first aspect of the present invention, the existing underground structure is dismantled leaving a part, and the underground outer wall and the underground floor of the existing underground structure are used as the filler filling portion. By filling the filler filling portion with a filler, a foundation ground having a large supporting force is constructed.
By constructing the foundation part of the new building on the foundation ground with increased support force, a part of the foundation part can protrude beyond the outer edge part of the underground outer wall.
That is, it is possible to provide a rebuilding method for a new building that is not affected by the planar outer shape of the underground outer wall of the underground structure of the existing building.

The invention according to claim 2 is the rebuilding method for a new building according to claim 1, wherein the foundation part that protrudes outward from the outer edge part of the underground outer wall is supported by a new ground improvement body or a new pile. It is characterized by.
As a result, even if the bearing capacity of the surrounding ground of the underground outer wall is smaller than the bearing capacity of the foundation ground, it is possible to suppress the uneven settlement of the foundation of the newly built building by supporting the foundation with the new ground improvement body or the new pile. .

The invention according to claim 3 is characterized in that, in the rebuilding method for a new building according to claim 1 or 2, the existing underground structure is pile-supported.
Thereby, since the existing underground structure left without being dismantled is pile-supported by the pile (existing pile), the foundation ground can exert a great support force. As a result, a high-rise new building can be constructed.

  The newly built building according to the invention of claim 4 is left without being dismantled, and is filled with a filler filling portion formed of an underground outer wall and an underground floor of an existing underground structure, and a filler in the filler filling portion. It is characterized by having a foundation ground formed by filling, and a foundation part which is constructed on the foundation ground so as to protrude at least partially outward from the outer edge part of the underground outer wall.

According to the fourth aspect of the present invention, the filling material remaining in the existing underground structure without being dismantled is filled with the filling material, and a foundation ground having a large supporting force is constructed. Thereby, the support force of a foundation ground is enlarged and a part of foundation part can be made to protrude outside the outer edge part of an underground outer wall on a foundation ground.
That is, it is possible to provide a new building that is not affected by the planar outer shape of the underground outer wall of the underground structure of the existing building.

  Since this invention is set as the said structure, it can provide the rebuilding method of the new building which is not influenced by the planar external shape of the underground outer wall of the underground structure of the existing building, and a new building.

(A) is a front view which shows the basic composition of the new building which concerns on 1st Embodiment of this invention, (B) is the top view. (A) is sectional drawing of the demolition stage of the building in the rebuilding method of the new building which concerns on 1st Embodiment of this invention, (B) is sectional drawing of the constructed foundation ground. (A) is a front view which shows the development example of the new building which concerns on 1st Embodiment of this invention, (B) is the top view. (A) is a front view which shows the other example of expansion | deployment of the new building which concerns on 1st Embodiment of this invention, (B) is the top view. (A) is a front view which shows the basic composition of the new building which concerns on 2nd Embodiment of this invention, (B) is the top view. (A) is a front view which shows the example of expansion | deployment of the new building which concerns on 2nd Embodiment of this invention, (B) is the top view. (A) is a front view which shows the basic composition of the new building which concerns on 3rd Embodiment of this invention, (B) is the top view. (A) is a front view which shows the basic composition of the new building which concerns on 4th Embodiment of this invention, (B) is the top view. (A) is a front view which shows the basic composition of the new building which concerns on 5th Embodiment of this invention, (B) is the top view.

(First embodiment)
A new building rebuilding method and a new building according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 (A) is a front view of a newly-built building 10 that has been rebuilt by a rebuilding method for a newly-built building, and FIG. 1 (B) is a plan view thereof. FIGS. 2A and 2B are cross-sectional views showing the building demolition stage.

As shown in FIGS. 1A and 1B, the new building 10 has a building frame 12. The building frame 12 is a general building made of reinforced concrete, the foundation 13 is constructed in the basement of the ground 22, and the depth of the foundation bottom 14 of the foundation 13 is H1.
A part of the existing building (old building) (the underground outer wall 18 and the underground floor 19) that has been demolished is left in the range of the depth H2 under the building housing 12 to form a filler filling portion 17.
The filler filling portion 17 is a space surrounded by the underground outer wall 18 left without being dismantled and the underground bottom board 19 below the underground outer wall 18, and the filler filling portion 17 includes fluidized soil (filler). ) 20 is filled. A foundation ground 24 is constituted by the filler filling portion 17 (the underground outer wall 18 and the underground bottom 19) and the fluidized soil 20.

Here, the fluidized soil 20 is formed by mixing cement and soil and has fluidity. The fluidized soil 20 is filled and injected into the filler filling portion 17 to fill the spaces between the foundation beams and the foundation columns in the filler filling portion 17, and the upper surface of the fluidized soil 20 filled. Corresponds to the upper surface of the filler filling portion 17. Thereby, the upper surface of the fluidized soil 20 and the foundation bottom 14 of the foundation 13 of the building housing 12 abut. Thereby, the filler filling part 17 and the fluidized soil 20 can be handled as the foundation ground 24. At this time, the supporting force of the foundation ground 24 can be equal to or higher than that of the surrounding ground. As a result, the foundation ground 24 can support the foundation portion 13 of the building frame 12.
In addition to the fluidized soil 20, the filler filling unit 17 may be filled with demolition waste generated when demolishing an existing building mixed with cement.

In addition, the foundation 13 of the building housing 12 is formed larger than the foundation ground 24 in plan view, is above the foundation ground 24 (upper surface), and is at least partially outward from the outer edge of the underground outer wall 18 (FIG. 1). The whole circumference) is built out.
The foundation portion 13 of the building frame 12 that protrudes from the foundation ground 24 is constructed on the ground 22 around the foundation ground 24.

That is, the filling material filling portion 17 that is a part of the existing building and is left without being dismantled is filled with the fluidized soil 20 and the foundation ground 24 having a large supporting force is constructed. Thereby, for example, the foundation part 13 of the building frame 12 having a larger plane scale than the existing underground structure can be constructed on the foundation ground 24 so as to partially protrude from the foundation ground 24. That is, it is possible to construct a new building 10 that is not affected by the planar outline of the foundation ground 24.
Moreover, since the underground outer wall 18 and the underground bottom 19 are left and utilized as the foundation ground 24, the removal cost can be reduced as compared with a method of removing all existing underground structures.

Here, the rebuilding method of the new building for constructing the new building 10 will be described with reference to FIGS. 1 and 2.
First, as shown to FIG. 2 (A), the above-ground part of the existing building 32 and a part of underground are demolished. That is, the existing building 32 is demolished leaving a portion deeper than the depth H1 from the surface of the ground 22 where the new building 10 is constructed. In addition, the underground outer wall 18 and the underground floor 19 of the existing building 32 that are deeper than the depth H <b> 1 are used as the filler filling portion 17.

  Simultaneously with the dismantling of the existing building 32, the ground 22 around the existing building 32 is excavated to form an excavation part 34 for constructing the new building 10. This is because the new building 10 has a larger planar shape than the existing building 32. Here, the depth of the excavation bottom 16 of the excavation part 34 is set to H1. A part of the foundation 13 of the building frame 12 of the new building 10 is constructed on the excavation bottom 16.

  Next, as shown in FIG. 2 (B), the fluidized soil 20 is filled into the space surrounded by the filler filling portion 17 up to the same surface (depth H1) as the excavation bottom 16. Thereby, the foundation ground 24 which supports the building frame 12 is constructed by the filler filling portion 17 and the fluidized soil 20 filled in the filler filling portion 17. At this time, the foundation beams and foundation pillars inside the filler filling portion 17 may be disassembled, or may be left in a range that does not hinder the injection of the fluidized soil 20.

  Next, as shown to FIG. 1 (A), the base part 13 of the building frame 12 of the new building 10 is constructed | assembled on the foundation ground 24 and the excavation bottom 16, and the building frame 12 is constructed | assembled sequentially on it. . At this time, the foundation part 13 of the building housing 12 is constructed such that at least a part thereof protrudes outside the outer edge part of the underground outer wall 18.

Next, a development example will be described with reference to FIG.
As shown in the front view of the new building 11 in FIG. 3 (A) and the plan view in FIG. 3 (B), the new building 11 in the first development example of the present embodiment includes the center of the foundation ground 24 and the building frame 12. The center does not match.
That is, as illustrated in FIG. 3A and FIG. 3B, the effects described in the present embodiment can be obtained without matching the center of the foundation ground 24 and the center of the building housing 12. .

In this case, the foundation 13 of the building housing 12 does not necessarily have to cover the entire upper surface of the foundation ground 24. That is, a part of the upper portion of the foundation ground 24 is not covered with the foundation portion 13 of the building housing 12, and the foundation portion 13 of the building housing 12 and the foundation ground 24 may partially overlap.
Thereby, the foundation part 13 of the building frame 12 can be supported by the foundation ground 24.

In addition, in FIG. 4, the minimum of the new building 36 which can be constructed | assembled by this embodiment is shown.
That is, as shown in FIG. 4A, if the depth H3 of the underground portion of the new building 36 is increased, the remaining amount of the underground outer wall 18 is reduced. The lower limit is the range in which the underground outer wall 18 disappears and only the underground floor 19 remains.
Also in this case, the fluidized soil 20 is filled into the space formed by the foundation pillars and foundation beams constituting the underground floor 19. The fluidized soil 20 can be used as the foundation ground 38 by finishing the upper surface of the underground floor 19 to a depth H3.

In the present embodiment, the case where the building frame 12 of the new building 10 is made of reinforced concrete has been described. However, the present invention is not limited to this, and the building housing 12 may be a steel structure or a wooden structure.

(Second Embodiment)
A new building rebuilding method and a new building according to the second embodiment of the present invention will be described with reference to FIGS.
The new building 40 of this embodiment is different from the first embodiment in that a pile (new pile) 26 is provided on the foundation 13 of the building frame 42 that protrudes outward from the outer edge of the foundation ground 24. The difference will be mainly described.

As shown in the front view of FIG. 5 (A) and the plan view of FIG. 5 (B), the foundation 13 of the building frame 42 is constructed with its surroundings protruding from the foundation ground 24. A plurality of piles 26 are provided on the foundation portion 13 that protrudes from the foundation ground 24.
Thereby, the uneven subsidence of the base part 13 based on the difference in the supporting force of the foundation ground 24 and the surrounding ground can be suppressed.

In other words, the support force for supporting the foundation portion 13 is enhanced by the plurality of piles 26 provided on the foundation portion 13 protruding from the foundation ground 24. Thereby, even if the supporting force of the surrounding ground of the basic ground 24 is smaller than the basic ground 24, the supporting power of the basic ground 24 and the surrounding ground can be adjusted.
As a result, it is possible to suppress the uneven settlement of the foundation portion 13 based on the difference in supporting force between the foundation ground 24 and the surrounding ground.

As shown in the front view of FIG. 6A and the plan view of FIG. 6B, a ground improvement body 28 is constructed outside the outer edge of the underground outer wall 18 of the foundation ground 24 in place of the pile 26. May be. That is, the ground 22 around the foundation ground 24 is improved and the supporting force of the foundation portion 13 is increased.
This is a particular problem when the centers of the foundation ground 24 and the foundation portion 13 do not coincide with each other, but it is possible to suppress the uneven settlement of the foundation portion 13 based on the difference in supporting force between the foundation ground 24 and the surrounding ground. Can do.

Here, although the case where a plurality of planar shapes of the ground improvement body 28 are constructed at intervals is illustrated, it may be configured to continuously surround the foundation 13 of the building frame 42.
Although the description is omitted, this embodiment may be applied to the development example described in the first embodiment. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Third embodiment)
A rebuilding method for a new building according to the third embodiment of the present invention will be described with reference to FIG.
The new building 50 of the present embodiment is different from the first embodiment in that the foundation ground 52 is supported by the pile 30. The difference will be mainly described.

As shown in the front view of FIG. 7 (A) and the plan view of FIG. 7 (B), the foundation ground 52 is the foundation ground 52 that is left undisassembled because the existing building is supported by the pile 30. The pile (existing pile) 30 is provided as it is.
That is, the foundation ground 52 is supported by the pile 30, and the supporting force of the foundation ground 52 is increased as compared with the configuration without the pile 30. Thereby, for example, a high-rise building frame 12 that requires a large support force can be constructed on the foundation ground 52.

Moreover, you may make it the bottom part of the pile 30 and the foundation ground 52 function as what is called a piled raft foundation where each of the pile 30 and the foundation ground 52 shares a load. As a result, it is possible to secure support force and suppress deformation.
Although the description is omitted, this embodiment may be applied to the development example described in the first embodiment. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Fourth embodiment)
A rebuilding method for a new building according to the fourth embodiment of the present invention will be described with reference to FIG.
This embodiment is different from the first embodiment in that the foundation ground 52 is supported by the pile 30 and the foundation portion 13 of the building frame 42 is also supported by the pile 26. The difference will be mainly described.

As shown in the front view of FIG. 8 (A) and the plan view of FIG. 8 (B), the foundation 13 of the building frame 42 that protrudes outward from the outer edge of the foundation ground 52 has a pile (new pile) 26. Is provided. Thereby, even if the supporting force of the ground 22 around the foundation ground 52 is small, the foundation portion 13 can be supported by the pile 26 and the supporting force can be increased.
As a result, the uneven settlement of the base portion 13 can be suppressed.

In addition, it may replace with the pile 26 and you may build the ground improvement body 28 demonstrated in 2nd Embodiment in the base part 13 (refer FIG. 6).
Moreover, the foundation ground 52 is supported by the pile (existing pile) 30 left without being dismantled.
As a result, the supporting force of the foundation ground 52 is increased, and for example, a high-rise new building 60 can be constructed.

Although the description is omitted, this embodiment may be applied to the development example described in the first embodiment. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Fifth embodiment)
A rebuilding method for a new building according to the fifth embodiment of the present invention will be described with reference to FIG.
This embodiment is different from the first embodiment in that the rigidity of the base portion 74 that constructs the building frame 72 of the new building 70 is increased. The difference will be mainly described.

As shown in the front view of FIG. 9A and the plan view of FIG. 9B, the foundation portion 74 of the new building 70 is formed larger than the foundation ground 24 in plan view and is above the foundation ground 24 (upper surface). ), And at least a part (the entire circumference in FIG. 9) protrudes outside the outer edge of the underground outer wall 18.
At this time, the formation H5 of the lowermost beam (foundation beam) 76 provided in the foundation portion 74 has rigidity and proof strength capable of resisting a deformation difference caused by a difference in supporting force between the foundation ground 24 and the surrounding ground. It is set as follows.

By adopting this configuration, even if a difference occurs in the supporting force between the foundation ground 24 and the surrounding ground 22, the foundation beam 76 with increased rigidity suppresses harmful deformation in the building frame 72. Thereby, the new building 70 which is not influenced by the planar external shape of the foundation ground 24 can be provided.
In addition, although illustration is abbreviate | omitted, as demonstrated in 1st Embodiment, the center of the foundation ground 24 and the center of the building frame 72 do not need to correspond also in this embodiment.
Further, this embodiment may be applied to the third embodiment. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

10 New Building 12 Building Body 14 Foundation Bottom of New Building 16 Drilling Bottom 17 Filling Material Filling Section (Existing Underground Structure)
18 Underground wall (existing underground structure)
19 Underground floor (existing underground structure)
20 Fluidized soil (filler)
22 Ground 24 Foundation ground 26 Pile (new pile)
28 Ground improvement body (new ground improvement body)
30 piles (existing piles)
32 Demolition (existing building)

Claims (4)

Partially dismantling the existing underground structure and leaving the underground outer wall and the basement floor as the filler filling part;
Building a foundation ground by filling the filler filling portion with a filler; and
On the foundation ground, constructing a foundation part of a new building at least partially protruding outward from an outer edge part of the underground outer wall; and
Reconstruction method for newly built buildings.   The rebuilding method for a new building according to claim 1, wherein the foundation portion that protrudes outward from the outer edge portion of the underground outer wall is supported by a new ground improvement body or a new pile.   The rebuilding method for a new building according to claim 1 or 2, wherein the existing underground structure is pile-supported. A filler filling part formed by the underground outer wall and the basement floor of the existing underground structure left undismantled;
A foundation ground formed by filling the filler filling portion with a filler;
On the foundation ground, to the outside from the outer edge of the underground outer wall, at least a part of the foundation part that protrudes, and
Newly built building with.

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