JP2023044695A - Reconstruction method of building - Google Patents

Abstract

To provide the reconstruction method of a building allowing reconstruction of the building, while using a part of an existing building.SOLUTION: The reconstruction method of a building includes steps of: S1 of constructing a reinforcement floor 32 on the first floor of an existing building 1, constructing a reinforced concrete wall surrounding a position for newly constructing piles 4 of a new construction building out of a basement first floor 30, as wall supports 33, and constructing steel wall supports 34 on a lower floor of the basement first floor; S2 of dismantling an existing ground skeleton 2 of the existing building 1 and dismantling existing columns 31, remaining the wall supports 33 on the basement first floor 30; S3 of newly constructing piles 4 of a new building 3 inside a part surrounded by the wall supports 33, 34 from upper part of the reinforcement floor 32; and S4 of sequentially dismantling the existing building 1 downward from the basement first floor 30 of the existing building 1, and constructing the new building 3.SELECTED DRAWING: Figure 6

Description

The present invention relates to a method for rebuilding an existing building into a new building.

Conventionally, there has been proposed a method of rebuilding a building in which an existing building is demolished and a new building is constructed in the same place (see Patent Literatures 1 and 2).
Patent Literature 1 discloses a rebuilding method for rebuilding an existing building including an underground passage into a new building while ensuring passage through the underground passage. Specifically, inside the existing underground passageway, a passageway frame member with strength that can be suspended and supported is assembled, the inner space is secured as an underground passageway space, and a new building above the underground passageway is built. In order to support the main part of the building, the structural columns will be cast into the ground, the existing building part located above the underground passage will be removed, and the construction of the above-ground part will proceed in a state where the structural columns support the load. To suspend and support a passage frame member by applying a reaction force to a ground part, remove an existing building part remaining under the passage frame member, and rebuild a new building.

In Patent Document 2, the existing underground outer wall of the existing building and some pillars and beams joined to the existing underground outer wall are left, and the existing building is demolished to the lower end, and the existing underground skeleton is dismantled upward from the lower end. and a step of backfilling the inside of the existing underground outer wall while demolishing the portion inside the existing underground outer wall.

JP 2010-90674 A Japanese Patent Application Laid-Open No. 2018-21320

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for rebuilding a building, which enables rebuilding work to be performed while using a part of an existing building.

A building rebuilding method of the first invention is a method for rebuilding an existing building (for example, an existing building 1 described later) having an aisle floor (for example, a first basement floor 30 to be described later), in which a new building is constructed on the aisle floor. A step of constructing a reinforced concrete wall shoring (for example, a wall shoring 33 to be described later) surrounding a position of a pile (for example, a pile 4 to be described later) (for example, a step S1 to be described later), and a step of surrounding with the wall shoring. and a step of newly installing piles inside the recess (for example, step S3 described later).

According to this invention, when rebuilding an existing building, a reinforced concrete wall shoring is constructed on the aisle floor. As a result, the part above the aisle floor of the existing building can be supported by the wall shoring, and the existing pillars and existing walls on the aisle floor can be removed. And it is possible to carry out the reconstruction work of the building while ensuring convenience.
In addition, since the vertical load borne by the existing frame of the aisle floor is borne by a small number of wall shorings, construction costs can be reduced.
In addition, since the new piles are constructed inside the wall shoring, it is possible to reduce the influence of the noise and vibration caused by the pile driving work on the outside of the wall shoring.

The building rebuilding method of the second invention includes an existing building (for example, the existing building 1 described later) having a passage floor (for example, the first basement floor 30 described later) provided with passages (for example, passages A to C described later) ) into a new building (for example, a new building 3 to be described later), wherein a work floor (for example, a reinforced floor 32 to be described later) is provided on the floor immediately above the passage floor (for example, the first floor) of the existing building. At the same time, a reinforced concrete wall is constructed as a wall shoring (for example, a wall shoring 33 to be described later) surrounding the positions where the piles (for example, the piles 4 to be described later) of the new building are to be newly installed in the passage floor. , a first step (for example, Step S1), which will be described later, dismantles a portion of the existing building above the working floor (for example, an existing ground frame 2 described later), and erects the existing building while leaving the wall shoring on the passage floor. A second step (for example, step S2 to be described later) of dismantling the skeleton (for example, the existing column 31 to be described later), and newly installing the piles of the new building from above the work floor to the inside surrounded by the wall shoring. A third step (for example, step S3 described later); For example, it is characterized by including step S4), which will be described later.

The rise frame of the aisle floor includes existing columns and existing walls.
According to this invention, when rebuilding an existing building into a new building, a reinforced concrete wall shoring is constructed on the passage floor. As a result, the part above the aisle floor of the existing building can be supported by the wall shoring, and the existing pillars and existing walls on the aisle floor can be removed. And it is possible to carry out the reconstruction work of the building while ensuring convenience.
In addition, since the vertical load that was borne by the existing frame of the aisle floor is borne by a small number of shoring, construction costs can be reduced.
In addition, since the new piles are constructed inside the wall shoring, it is possible to reduce the influence of the noise and vibration caused by the pile driving work on the outside of the wall shoring.

A method for rebuilding a building according to a third aspect of the invention is characterized in that, in the first step, the lower layer of the existing building is filled with fluidized soil (for example, fluidized soil M to be described later).

Here, the lower layer of the existing building is, for example, a portion below the groundwater level.
According to this invention, since the lower layer of the existing building is filled with fluidized soil, the lower layer of the existing building can be reinforced and the load of the upper layer can be reliably supported when the existing building is demolished.

In the building rebuilding method of the fourth invention, in the third step, the existing frame surrounded by the wall shoring (for example, floor slabs 35 to 38 of each floor described later) is dismantled, and then the piles are newly installed. characterized by

According to this invention, by dismantling the existing frame surrounded by the wall shoring, it is possible to secure a space extending vertically downward from the working floor inside the wall shoring. Therefore, new piles can be easily driven from above the working floor into the space surrounded by the wall shoring.

ADVANTAGE OF THE INVENTION According to this invention, the rebuilding method of the building which can rebuild a building using a part of existing building can be provided.

1 is a longitudinal sectional view of an existing building 1 to which a building rebuilding method according to an embodiment of the present invention is applied; FIG. FIG. 2 is a sectional view taken along line II of FIG. 1; It is a flowchart of the procedure of rebuilding an existing building to a new building. It is explanatory drawing (1) of the procedure which rebuilds an existing building to a new building. FIG. 5 is a cross-sectional view taken along the line II-II of FIG. 4; It is explanatory drawing (2) of the procedure which rebuilds an existing building to a new building. FIG. 7 is a cross-sectional view taken along line III-III in FIG. 6;

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an existing building 1 to which a building rebuilding method according to an embodiment of the invention is applied. FIG. 2 is a cross-sectional view of the existing building 1 of FIG. 1 taken along the line II.
The existing building 1 has an existing underground skeleton 10 made of reinforced concrete up to the third basement floor, and an existing ground skeleton 2 constructed on the existing underground skeleton 10. - 特許庁The existing underground skeleton 10 includes a foundation 11, a 3rd basement floor rise 12, a 2nd basement floor rise 13, and a 1st basement floor rise 14. - 特許庁The first basement floor 30 is an aisle floor in which, for example, aisles A, B, and C are secured between the existing pillars 31 that are the rising frame.
Hereinafter, the rise of the n underground floors includes the n underground pillars, the n underground walls, the (n−1) underground beams, and the (n−1) underground floors.
The foundation 11 includes foundation beams (underground beams) 20 , a pressure-resistant board 21 , and a floor slab 22 for the third basement floor. A space surrounded by the foundation beam 20 , the pressure-resistant board 21 , and the third basement floor slab 22 serves as a pit 23 . Further, the groundwater level W is the level of the floor slab 22 on the third basement floor.

The procedure for dismantling the existing building 1 and rebuilding it into the new building 3 will be described with reference to the flow chart of FIG.
In step S1, as shown in FIGS. 4 and 5, a reinforced floor 32 as a work floor is constructed by placing reinforced concrete on the floor surface of the first floor, which is directly above the first basement floor 30, which is a passage floor. Integrate the ground floor and beams. Also, a wall support 33, which is a wall made of reinforced concrete, is constructed around the position where the pile 4 of the new building 3 is to be newly installed on the first basement floor 30. In addition, a wall shoring 34 that is a steel wall is constructed at a position directly below the wall shoring 33 on the lower floor of the first basement floor 30 . The steel wall shoring 34 includes a plurality of struts made of steel materials and jacks, and steel plates attached to the surfaces of these struts. In addition, the pit 23 of the existing building 1, which is lower than the groundwater level W, is filled with the fluidized soil M.

In step S2, as shown in FIGS. 6 and 7, the portion above the reinforced floor 32 of the existing building 1, that is, the existing ground frame 2 is demolished. In addition, on the first basement floor 30, which is a passage floor, the existing column 31, which is a building structure, is dismantled while leaving the wall shoring 33. As a result, passages A to C are continuously secured on the first basement floor 30, which is a passage floor.
In step S3, as shown in FIGS. 6 and 7, the piles 4 of the new building 3 are newly installed from above the reinforced floor 32 to the inside surrounded by the wall shorings 33 and 34. As shown in FIGS. Specifically, the portions surrounded by the wall shorings 33 and 34 on each floor, that is, the floor slabs 22 and 36 to 38 on each floor are dismantled to form a space extending vertically downward from the reinforced floor 32. Pile 4 of new building 3 is newly installed.
In step S4, the existing building 1 is dismantled sequentially downward from the first basement floor 30 of the existing building 1, and a new building 3 is constructed on the newly installed piles 4. - 特許庁

According to this embodiment, there are the following effects.
(1) When rebuilding the existing building 1 into a new building 3, construct a reinforced concrete wall shoring 33 on the first basement floor 30, which is a passage floor. As a result, the part above the first floor of the existing building 1 is supported by the wall shoring 33, and the existing pillar 31 on the first basement floor 30 can be removed, so the first basement floor 30 of the existing building 1 can be used as a passage. It is possible to reconstruct the building while ensuring the safety and convenience of building users. Specifically, even during the demolition work of the existing building 1, passages A to C on the first basement floor 30 can be secured.
Moreover, since the vertical load borne by the existing pillars 31 on the first basement floor 30 is borne by a small number of wall shorings 33, construction costs can be reduced.
In addition, since the new piles 4 are constructed inside the walls surrounded by the wall shorings 33 and 34, it is possible to reduce the influence of noise and vibration caused by the pile driving work on the outside of the wall shorings.

(2) Since the pit 23 in the lower layer of the existing building 1 is filled with the fluidized soil M, the lower layer of the existing building 1 is reinforced, and the load of the upper layer when the existing building 1 is demolished can be reliably supported.
(3) By dismantling the floor slabs 22, 36-38 on each floor surrounded by the wall shorings 33, 34, the floor slabs extend vertically downward from the reinforced floor 32 to the inner side surrounded by the wall shorings 33, 34. Space can be secured. Therefore, the new pile 4 can be easily driven into the space surrounded by the wall shorings 33 and 34 from above the reinforcing floor 32 .

It should be noted that the present invention is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present invention.

1... Existing building 2... Existing ground frame 3... New building 4... New pile 10... Existing underground frame 11... Foundation 12... Basement 3rd floor rise 13 Basement 2nd floor rise 14 Basement 1st floor rise 20... Foundation beam 21... Pressure-resistant board 22: Floor slab on the 3rd basement floor 23: Pit 30: 1st basement floor (passage floor) 31: Existing pillar 32: Reinforced floor (work floor)
33 ... Wall shoring which is a reinforced concrete wall 34 ... Wall shoring which is a steel wall 36 ... Basement 2nd floor floor slab 37 ... Basement 1st floor floor slab 38 ... First floor floor slab M ... Fluidized soil

Claims (4)

A rebuilding method for a building having an aisle floor,
a step of constructing a reinforced concrete wall shoring on the aisle floor surrounding the positions of the newly installed piles;
A method for rebuilding a building, comprising: a step of newly installing piles inside the walls surrounded by the wall shoring. A method for rebuilding an existing building having an aisle floor with an aisle into a new building, comprising:
A working floor is constructed on the floor directly above the aisle floor of the existing building, and a reinforced concrete wall is constructed as a wall shoring around the position where the piles of the new building are to be newly installed on the aisle floor. A first step of constructing a wall shoring made of reinforced concrete or steel at a position directly below the wall shoring of the aisle floor on the lower floor;
a second step of demolishing a portion of the existing building above the work floor and demolishing the rising frame of the existing building while leaving the wall shoring on the passage floor;
a third step of newly installing piles of the new building from above the working floor to the inside surrounded by the wall shoring;
and a fourth step of demolishing the existing building sequentially downward from the passage floor of the existing building and constructing a new building on the newly installed piles. 3. The method of rebuilding a building according to claim 2, wherein in said first step, the lower layer of said existing building is filled with fluidized soil. 4. The method of rebuilding a building according to claim 2, wherein in the third step, the existing frame surrounded by the wall shoring is dismantled, and then the piles are newly installed.

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