JP7565256B2 - How to rebuild a building - Google Patents

Description

The present invention relates to a method for rebuilding a building by replacing an existing building with a new building.

Conventionally, methods for rebuilding buildings have been proposed in which an existing building is demolished and a new building is constructed in the same location (see Patent Documents 1 and 2).
Patent Document 1 shows a method of rebuilding an existing building including an underground passage into a new building while ensuring passage through the underground passage. Specifically, inside the existing underground passage, a passage frame member having a strength capable of being supported by hanging is assembled, and its inner space is secured as an underground passage space, and structural columns are cast into the ground so as to support the above-ground part of a new building to be built above the underground passage, and the existing building part located above the underground passage is removed, and construction of the above-ground part is carried out so that the structural columns can support the load, and the passage frame member is supported by hanging by applying a reaction force to the above-ground part, and the existing building part remaining below the passage frame member is removed and replaced with a new building.

Patent Document 2 shows a method for rebuilding a building, which includes the steps of demolishing the existing building down to its bottom end, leaving the existing basement exterior wall of the existing building and some of the columns and beams connected to the existing basement exterior wall, and backfilling the inside of the existing basement exterior wall while demolishing the part of the existing underground structure that is inside the existing basement exterior wall from the bottom end upward.

JP 2010-90674 A JP 2018-21320 A

The objective of the present invention is to provide a method for rebuilding a building that allows reconstruction work to be carried out while utilizing part of the existing building.

The building reconstruction method of the first invention is a method for rebuilding an existing building (e.g., existing building 1 described below) having a passage floor (e.g., basement floor 1 30 described below), and is characterized by comprising a process (e.g., step S1 described below) of constructing a reinforced concrete wall support (e.g., wall support 33 described below) on the passage floor surrounding the position of a new pile (e.g., pile 4 described below), and a process (e.g., step S3 described below) of constructing a new pile inside the wall support.

According to this invention, when rebuilding an existing building, a wall support made of reinforced concrete is constructed on the passage floor. This allows the wall support to support the part of the existing building above the passage floor, and allows the existing columns and walls on the passage floor to be removed, so that part of the existing building can be used and the building reconstruction work can be carried out while ensuring the safety and convenience of building users.
In addition, the vertical load that was previously borne by the existing structure on the corridor floor can now be borne by a smaller number of wall supports, reducing construction costs.
In addition, since the new piles are constructed inside the area surrounded by the wall support, the impact of noise and vibrations generated during pile driving work on the outside of the wall support can be reduced.

The building reconstruction method of the second invention is a method of rebuilding an existing building (e.g., existing building 1 described below) having a passage floor (e.g., first basement floor 30 described below) with a passage (e.g., passages A to C described below) to a new building (e.g., new building 3 described below), in which a work floor (e.g., reinforced floor 32 described below) is constructed on the floor directly above the passage floor of the existing building (e.g., first floor described below), a reinforced concrete wall is constructed as wall support (e.g., wall support 33 described below) surrounding the position on the passage floor where the piles (e.g., pile 4 described below) of the new building will be newly installed, and a reinforced concrete or steel wall support (e.g., The construction method includes a first step (e.g., step S1 described below) of constructing a wall support 34, a second step (e.g., step S2 described below) of demolishing a portion of the existing building above the work floor (e.g., the existing above-ground structure 2 described below) and demolishing the rising structure of the existing building (e.g., the existing columns 31 described below) while leaving the wall support on the passage floor, a third step (e.g., step S3 described below) of installing new piles for the new building inside the wall support from above the work floor, and a fourth step (e.g., step S4 described below) of demolishing the existing building from the passage floor downwards and constructing the new building on the newly installed piles.

The rising structure of the corridor floor includes existing columns and walls.
According to this invention, when replacing an existing building with a new building, a wall support made of reinforced concrete is constructed on the passage floor. This allows the wall support to support the part of the existing building above the passage floor, and allows the existing columns and walls on the passage floor to be removed, so that part of the existing building can be used and the building reconstruction work can be carried out while ensuring the safety and convenience of building users.
In addition, the vertical load that was previously borne by the existing structure on the corridor floor can now be borne by a smaller number of supports, reducing construction costs.
In addition, since the new piles are constructed inside the area surrounded by the wall support, the impact of noise and vibrations generated during pile driving work on the outside of the wall support can be reduced.

The building reconstruction method of the third invention is characterized in that in the first step, fluidized soil (e.g., fluidized soil M described below) is filled into the lower layer of the existing building.

Here, the lower floor of an existing building refers to, for example, the part below the groundwater level.
According to this invention, since the lower layer of an existing building is filled with fluidized soil, the lower layer of the existing building is reinforced and can reliably support the load of the upper layers when the existing building is demolished.

The building reconstruction method of the fourth invention is characterized in that in the third step, the existing structure surrounded by the wall supports (e.g., floor slabs 35 to 38 of each floor, described below) is demolished, and then the piles are newly installed.

According to this invention, by demolishing the existing structure surrounded by the wall supports, a space extending vertically downward from the work floor can be secured inside the wall supports. This makes it easy to drive new piles from above the work floor into the space surrounded by the wall supports.

The present invention provides a method for rebuilding a building that allows reconstruction work to be carried out while utilizing part of the existing building.

1 is a vertical cross-sectional view of an existing building 1 to which a building reconstruction method according to one embodiment of the present invention is applied. FIG. 2 is a cross-sectional view taken along line II of FIG. 1 is a flowchart of the procedure for replacing an existing building with a new building. This is an explanatory diagram (part 1) of the procedure for replacing an existing building with a new building. This is a cross-sectional view of FIG. 4 taken along line II-II. This is an explanatory diagram (part 2) of the procedure for replacing an existing building with a new building. FIG. 7 is a cross-sectional view taken along line III-III of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Fig. 1 is a vertical cross-sectional view of an existing building 1 to which a building reconstruction method according to an embodiment of the present invention is applied. Fig. 2 is a cross-sectional view of the existing building 1 in Fig. 1 taken along line II.
The existing building 1 has an existing underground structure 10 made of reinforced concrete up to the third basement floor, and an existing above-ground structure 2 constructed on the existing underground structure 10. The existing underground structure 10 has a foundation 11, a third basement floor rise 12, a second basement floor rise 13, and a first basement floor rise 14. The first basement floor 30 is a passage floor where, for example, passages A, B, and C are secured between the existing columns 31 that are the rise structures.
Hereinafter, the nth basement floor rise includes the nth basement floor columns, the nth basement floor walls, the (n-1)th basement floor beams, and the (n-1)th basement floor floor.
The foundation 11 includes a foundation beam (underground beam) 20, a pressure-resistant plate 21, and a third basement floor slab 22. The space surrounded by the foundation beam 20, the pressure-resistant plate 21, and the third basement floor slab 22 forms a pit 23. The groundwater level W is at the level of the third basement floor slab 22.

The procedure for demolishing the existing building 1 and replacing it with the new building 3 will be described with reference to the flow chart of FIG.
In step S1, as shown in Fig. 4 and Fig. 5, reinforced concrete is poured on the floor surface of the first floor, which is the floor immediately above the first basement floor 30, which is the passage floor, to construct a reinforced floor 32 as a work floor, and the floor and beams of the first floor are integrated. In addition, a wall support 33, which is a wall made of reinforced concrete, is constructed around the position of the first basement floor 30 where the piles 4 of the new building 3 are to be newly installed. In addition, a wall support 34, which is a steel wall, is constructed in a position directly below the wall support 33 on the floor below the first basement floor 30. This steel wall support 34 is composed of a plurality of supports made of steel materials and jacks, and steel plates attached to the surfaces of these supports. In addition, the pit 23 of the existing building 1, which is lower than the groundwater level W, is filled with liquefied soil M.

In step S2, as shown in Figures 6 and 7, the portion of the existing building 1 above the reinforced floor 32, i.e., the existing above-ground structure 2, is demolished. Also, on the first basement floor 30, which is the passage floor, the existing columns 31, which are the rising structure, are demolished while leaving the wall supports 33. As a result, the passages A to C are still secured on the first basement floor 30, which is the passage floor.
In step S3, as shown in Figures 6 and 7, the piles 4 of the new building 3 are newly installed inside the area surrounded by the wall supports 33, 34 from above the reinforced floor 32. Specifically, the areas surrounded by the wall supports 33, 34 of each floor, i.e., the floor slabs 22, 36-38 of each floor, are dismantled to form spaces extending vertically downward from the reinforced floor 32, and the piles 4 of the new building 3 are newly installed through these spaces.
In step S4, the existing building 1 is demolished in sequence from the first basement floor 30 downwards, and the new building 3 is constructed on the newly installed piles 4.

According to this embodiment, the following effects are obtained.
(1) When replacing the existing building 1 with the new building 3, a wall support 33 made of reinforced concrete is constructed on the first basement floor 30, which is the passage floor. This allows the wall support 33 to support the portion of the existing building 1 above the first floor and remove the existing columns 31 on the first basement floor 30, so that the first basement floor 30 of the existing building 1 can be used as a passage and the building reconstruction work can be carried out while ensuring the safety and convenience of building users. Specifically, even during the demolition work of the existing building 1, the passages A to C on the first basement floor 30 can be secured.
In addition, the vertical load borne by the existing columns 31 on the first basement floor 30 is now borne by a small number of wall supports 33, thereby reducing construction costs.
In addition, since the new piles 4 are constructed inside the area surrounded by the wall supports 33, 34, the impact of noise and vibrations generated during pile driving work on the outside of the wall supports can be reduced.

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

The present invention is not limited to the above-described embodiment, and any modifications or improvements that can achieve the object of the present invention are included in the present invention.

1...Existing building 2...Existing above-ground structure 3...New building 4...New pile 10...Existing underground structure 11...Foundation 12...3rd basement floor rise 13...2nd basement floor rise 14...1st basement floor rise 20...Foundation beam 21...Pressure-resistant plate 22...3rd basement floor slab 23...Pit 30...1st basement floor (passageway floor) 31...Existing column 32...Reinforced floor (work floor)
33... Wall support made of reinforced concrete 34... Wall support made of steel 36... Second basement floor slab 37... First basement floor slab 38... First floor floor slab M... Fluidized soil

Claims (4)

A method for rebuilding a building having a passageway, comprising the steps of:
A step of constructing a wall support structure made of reinforced concrete around the position of the newly installed piles on the passage floor;
A method for rebuilding a building, comprising the steps of: installing new piles inside the area surrounded by the wall supports. A method for replacing an existing building having a passageway floor with a passageway to a new building, comprising the steps of:
a first step of constructing a work floor on the floor immediately above the passage floor of the existing building, constructing a reinforced concrete wall as a wall support surrounding the position on the passage floor where the piles of the new building will be installed, and constructing a reinforced concrete or steel wall support on the floor below the passage floor in a position directly below the wall support of the passage floor;
A second step of demolishing a portion of the existing building above the work floor and demolishing a rising frame of the existing building while leaving the wall supports on the passage floor;
A third step of installing piles of the new building on the inside surrounded by the wall supports from above the work floor;
and a fourth step of demolishing the existing building in sequence from the corridor floor downward of the existing building and constructing a new building on the newly installed piles. The building reconstruction method according to claim 2, characterized in that in the first step, fluidized soil is filled in the lower layer of the existing building. The building reconstruction method according to claim 2 or 3, characterized in that in the third step, the existing structure surrounded by the wall supports is demolished, and then the piles are newly installed.

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