JP2015014159A - Structure reconstruction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure reconstruction method capable of reducing cost required for reconstruction, while reducing a load applied to an environment.SOLUTION: The structure reconstruction method executes a new construction process and a reconstruction process. The new construction process executes Steps S2B and S3B of forming a new construction work space 63 by installing an upper side outer peripheral scaffold 60, Steps S4B and S5B of constructing a residue of a new construction part 20 in this new construction work space 63 and Steps S6B-S8B of repeating the Steps S4B and S5B by moving the upper side outer peripheral scaffold 60 upward by one layer in order. The reconstruction process executes a Step S2A of forming a reconstruction work space 33 by installing a lower side outer peripheral scaffold 30, Steps S3A-S5A of disassembling and reinforcing an existing building 1 except for a reuse structure 40 in this reconstruction work space 33 and Steps S6A-S8A of repeating the Steps S3A-S5A by moving the lower side outer peripheral scaffold 30 downward by one layer in order.

Description

  The present invention relates to a structure reconstruction method. More specifically, the present invention relates to a structure reconstructing method for reconstructing an existing structure and constructing a new structure on the existing structure.

Conventionally, in a high-rise building, there is a case where a building is dismantled and a new building is constructed due to the aging of facilities and structures.
As a method of demolishing a building, for example, a temporary roof made of a hat truss is provided on the top floor, and a space surrounded by the temporary roof is used as a dismantling work space. And methods for preventing noise have been proposed.

Japanese Patent No. 3218519

However, the conventional method has a problem that the construction period is prolonged and the cost is increased because a new building is constructed after the dismantling of the existing building is completed.
Moreover, in order to completely dismantle existing buildings, there was a problem that a huge amount of dismantling material was generated and a large load was placed on the environment.

  It is an object of the present invention to provide a structure reconstructing method that can reduce the cost of remodeling while reducing the load on the environment.

  The method for reconstructing a structure according to claim 1 reconstructs an existing structure (for example, an existing building 1 described later) and a new structure (for example, a new installation section 20 described later) on the existing structure. A method for constructing a structure to be constructed, wherein at least a part of a structure (for example, a new pillar 21 and a new beam 22 described later) is constructed on the roof floor of the existing structure and supported by the structure. An upper temporary wall (for example, an upper outer periphery scaffold 60 described later) that covers the outer periphery of the newly installed portion is formed at a height of n (n is a natural number) layers (for example, one layer) above the floor level of the rooftop floor. Now, a new construction initial step (for example, steps S2B and S3B described later) for forming a new work space (for example, a new work space 63 described later) surrounded by the upper temporary wall, To build the rest of the new department In addition, on the new work space, a new work process (for example, steps S4B and S5B described later) for constructing at least a part of the structure of the new part, and the upper temporary wall is moved upward by n layers. Thus, a new construction process (for example, steps S6B to S8B described later) is performed in order, by forming the new construction work space upward and repeating the new construction work process in the new construction work space (for example, steps S6B to S8B described later). S2B to S8B, which will be described later), and a lower temporary wall (for example, a lower outer periphery scaffold 30 described later) that covers the outer periphery of the existing structure, n layers below the floor level of the roof floor of the existing structure A renovation initial step (for example, step S2A described later) for forming a renovation work space (for example, a remodeling work space 33 described later) surrounded by the lower temporary wall; In the work space, at least a part of the structure is a reuse structure (for example, a reuse structure 40 described later), and the existing structure is dismantled except for the reuse structure, and the reuse structure A remodeling work step (for example, steps S3A to S5A described later) for reinforcing the body and the lower temporary wall is moved downward by n layers to form the remodeling work space downward, and the remodeling work A remodeling process (for example, steps S6A to S8A described later) that repeats the remodeling work process in the space, and a remodeling process (for example, S2A to S8A described later) for sequentially performing the new building process. At the same time, the reconstruction process is performed.

According to this invention, a new installation part is constructed on the roof floor of an existing structure in the following procedure.
That is, first, an upper temporary wall that covers the outer periphery of the new part is erected at a height of n layers above the floor level of the existing structure rooftop, and a new work space surrounded by the upper temporary wall is formed. Form. Next, the new section is completed within the new work space. Next, by moving the upper temporary wall upward by n layers, a new work space is formed upward, and the above-described new work is repeated.

In addition, the existing structure will be renovated according to the following procedure.
That is, first, the lower temporary wall covering the outer periphery of the existing structure was erected at a height of n layers below the floor level of the existing structure on the roof floor and surrounded by the lower temporary wall. Form a renovation work space. Next, in the remodeling work space, at least the existing columns and the existing large beams are used as reuse structures, and the existing structures are dismantled except for the reuse structures and the reuse structures are reinforced. Next, the renovation work space is formed downward by moving the lower temporary wall downward by n layers, and the above-described renovation work is repeated.

  In this way, a new work space is formed on the rooftop floor of an existing structure, and a new part is constructed in the new work space. At the same time, a renovation work space is formed on the top floor of the existing structure, and the existing structure is renovated in this renovation space. And while constructing a new installation part while moving a newly constructed work space upward, an existing structure is renovated while moving the modified work space downward.

Here, in the renovation work space, on the same floor, the existing structure is dismantled, and at the same time, a new structure is constructed using a part of the existing structure. At this time, a temporary wall is provided so as to surround the existing structure, and the work of the outer wall portion is performed using the temporary wall.
Therefore, since a new work space and a renovation work space can be constructed simply by providing a temporary wall, a new work space and a renovation work space can be constructed with a small amount of temporary material, and the cost is low.

In addition, while disassembling the existing structure, construct a new structure higher than this existing structure, so compared to the case of constructing the new structure after dismantling of the existing structure as in the past, In addition to being able to renovate in a short construction period, the cost of renovation can be reduced.
In addition, because the new work space and the renovation work space are enclosed by temporary walls, dust can be prevented from scattering around the existing structure when it is dismantled, and noise can be reduced. Can be prevented. Thus, the load on the surrounding environment can be reduced.

In addition, since a new structure is constructed by reusing a part of the existing structure, the amount of dismantling material can be reduced, and the load on the environment can be reduced.
In addition, when construction is performed at a high place, if a tower crane or a jib crane is used, the work efficiency is lowered due to the influence of the wind, but since the temporary wall is not affected by the wind, the existing structure can be efficiently disassembled.

  The structure reconstructing method according to claim 2, wherein before the new construction process and the remodeling process, the building structure of the existing structure is lowered by dismantling from the roof floor to the predetermined floor of the existing structure. It further comprises a dismantling process.

  According to this invention, since the existing structure is demolished to a predetermined floor before the new construction process and the reconstruction process, the building height of the new structure is made lower than that of the existing structure or after the reconstruction of the new structure The ratio of the portion occupied by existing structures can be reduced.

  The structure reconstructing method according to claim 3 is characterized in that the weight of the newly installed portion is equal to or less than the weight reduced by remodeling of the existing structure.

  According to the present invention, the weight of the newly installed portion is set to be equal to or less than the weight reduced by the reconstruction of the existing structure. That is, the sum of the weight of the existing structure after the renovation and the weight of the newly installed part is set to be equal to or less than the weight of the existing structure before the renovation. Therefore, it is not necessary to add a foundation to construct a new structure, and the cost is reduced.

  5. The method for reconstructing a structure according to claim 4, wherein, in the remodeling step, the floor slab of the existing structure is removed as a means for reinforcing the reuse structure, and the structure is reinforced around the existing pillars of the existing structure. At least one of adding a column and incorporating a seismic isolation device into an existing column of the existing structure is used.

  According to the present invention, when the floor slab of the existing structure is removed as a means for reinforcing the reuse structure, the weight of the upper part of the building of the existing structure is reduced, so that the horizontal load applied to the building during the earthquake (Inertial force against the weight of the upper part of the building) can be reduced. Further, when reinforcing columns are added around the existing columns of the existing structure, the strength of the columns of the new structure can be increased by reinforcing the existing columns with the reinforcing columns. In addition, when a seismic isolation device is incorporated into an existing pillar of an existing structure, a new structure including the existing structure after reconstruction can be easily seismically isolated.

  According to the present invention, since a new work space and a renovation work space can be constructed simply by providing a temporary wall, a new work space and a renovation work space can be constructed with a small amount of temporary material, and the cost is low. In addition, while disassembling the existing structure, construct a new structure higher than this existing structure, so compared to the case of constructing the new structure after dismantling of the existing structure as in the past, In addition to being able to renovate in a short construction period, the cost of renovation can be reduced. In addition, because the new work space and the renovation work space are enclosed by temporary walls, dust can be prevented from scattering around the existing structure when it is dismantled, and noise can be reduced. Can be prevented. Thus, the load on the surrounding environment can be reduced. In addition, since a new structure is constructed by reusing a part of the existing structure, the amount of dismantling material can be reduced, and the load on the environment can be reduced. In addition, when construction is performed at a high place, if a tower crane or a jib crane is used, the work efficiency is lowered due to the influence of the wind, but since the temporary wall is not affected by the wind, the existing structure can be efficiently disassembled.

It is sectional drawing of the existing structure to which the structure reconstruction method which concerns on one Embodiment of this invention is applied. It is a flowchart of the procedure which rebuilds an existing structure by the structure rebuilding method which concerns on the said embodiment. It is FIG. (1) for demonstrating the procedure which rebuilds an existing structure by the structure rebuilding method which concerns on the said embodiment. It is FIG. (2) for demonstrating the procedure which rebuilds an existing structure by the structure rebuilding method which concerns on the said embodiment. It is FIG. (3) for demonstrating the procedure which rebuilds an existing structure by the structure rebuilding method which concerns on the said embodiment. It is FIG. (4) for demonstrating the procedure which rebuilds an existing structure by the structure rebuilding method which concerns on the said embodiment. It is FIG. (5) for demonstrating the procedure which rebuilds an existing structure with the structure rebuilding method which concerns on the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of an existing building 1 as an existing structure to which a structure reconstructing method according to an embodiment of the present invention is applied.
The existing building 1 is a high-rise building with m (m is a natural number) floors. This existing building 1 includes a plurality of existing pillars 11 and a plurality of existing large beams 12 that connect these existing pillars 11 as a framework, that is, a structure. Moreover, this existing building 1 is provided with the existing floor slab 13, the existing outer wall 14, the existing partition wall 15, etc. as a non-structural body. That is, in this embodiment, the structure is a column and a large beam that constitute a building framework.

  The structure reconstruction method of the present invention is to reconstruct the existing building 1. Specifically, the new building 2 is constructed by remodeling the existing building 1 and constructing the new installation unit 20 as a new structure on the existing building 1.

The new section 20 includes a new pillar 21 that is located immediately above the existing pillar 11 of the existing building 1, a new beam 22 that connects the column heads of the new pillar 21, and a new floor slab 24 that is supported by the new beam 22. With. These new columns 21 are located immediately above the existing columns 11 of the existing building 1, and the vertical load of the new columns 21 is supported by the existing columns 11 (see FIGS. 3 to 7).
In addition, the weight of the newly installed part 20 is equal to or less than the weight reduced by the renovation of the existing building 1.

  In addition, since the floor level of the rooftop floor of the existing building 1 becomes the floor level of the (m + 1) floor of the new building 2 by constructing the new installation part 20, in FIGS. Is displayed as the (m + 1) th floor.

  Hereinafter, the procedure for constructing the new building 2 will be described with reference to the flowchart of FIG.

In step S1, as shown in FIG. 3, the existing pillar 11 for supporting the new pillar 21 of the new part 20 is reinforced. Specifically, it is reinforced with extra struts, steel pipe hoisting, carbon sheet hoisting, and the like. Here, the carbon sheet 50 is wound around the existing pillar 11.
If the foundation of the existing building 1 needs to be reinforced, it will be a piled raft foundation that uses a pile foundation and a direct foundation together.

  Hereinafter, with the floor level of the rooftop floor of the existing building 1 as a construction boundary, the following steps S2A to S8A are executed below the construction boundary, and the following steps S2B to S8B are executed above the construction boundary.

  In step S2A, as shown in FIG. 4, a lower outer periphery scaffold 30 as a temporary wall covering the outer periphery of the existing building 1 is installed at a height of one layer below the floor level of the roof floor of the existing building 1. To do. Specifically, a temporary floor 31 projecting outward from the existing outer wall 14 is provided on the outer periphery of the floor level of the m floor of the existing building 1, and a temporary scaffold 32 made of a frame scaffold is provided on the temporary floor 31. Thereby, the lower outer periphery scaffold 30 is constructed on the uppermost floor, that is, the m floor, and the space surrounded by the lower outer periphery scaffold 30 is formed as the remodeling work space 33.

In step S3A, as shown in FIG. 5, the existing building 1 is dismantled in the renovation work space 33 except for some structures.
Specifically, first, at least a structure necessary for reusing the existing building 1, in this case, the existing pillar 11 and the existing large beam 12 is defined as a reuse structure 40.
And the part except this reuse structure 40, ie, the existing outer wall 14, the existing partition wall 15, the existing installation apparatus, etc. are disassembled. Here, the existing floor slab 13 on the m floor of the existing building 1 may be removed.

  In the dismantling operation, a carry-out port (not shown) is provided inside or on the outer periphery of the existing building 1, the dismantling material is moved to the carry-out port using a traveling crane or the like, and is carried out to the lower floor with a hoist (not shown). The demolished material carried out to the lower floor is separated from recyclable materials and industrial waste, and is taken out of the venue.

In step S4A, as shown in FIG. 5, the reuse structure 40 is reinforced in the remodeling work space 33. Specifically, a reinforcing column 51 is added around a predetermined existing column 11.
Moreover, you may reduce the horizontal load which acts on a building upper part at the time of an earthquake by interposing a seismic isolation device in the column base part or column head of the predetermined existing pillar 11. Although not shown, a reinforcing frame or a reinforcing beam may be provided.

In step S5A, as shown in FIG. 5, the structure or non-structure of the new building 2 is constructed in the remodeling work space 33.
Specifically, in the renovation work space 33, a new outer wall 52, a new floor slab 53, and a new partition wall 54 are constructed, or new equipment not shown is installed.

  In step S6A, by using a crane (not shown) provided in the existing building 1 and moving the lower outer periphery scaffold 30 downward by one layer as shown in FIG. 6, the reconstruction work space 33 also has one layer. Just move down. That is, a new temporary floor 31 is provided on the (m-1) floor, and then the temporary scaffold 32 is moved downward and placed on the new temporary floor 31.

  In step S7A, as shown in FIG. 7, steps S3A to S5A described above are performed. That is, in the renovation work space 33, the structure is dismantled except for a part of the structure of the existing building 1, that is, the reuse structure 40. Thereafter, the reuse structure 40 is reinforced and a structure or a non-structure of the new building 2 is newly provided.

  In step S8A, the above steps S6A and S7A are repeated as one set, and the reconstruction work is performed toward the lower floor.

In step S2B, as shown in FIG. 3, a structure for one layer of the newly installed unit 20 is constructed on the rooftop floor (R floor) of the existing building 1, that is, (m + 1) floor.
Specifically, the new columns 21 are built on the floor of the (m + 1) floor of the existing building 1, and the new beam 22 that connects the column heads of these new columns 21 is constructed to construct a new column beam frame. .
As a result, the upper end of the newly installed beam 22 becomes the floor level of the (m + 2) floor of the newly installed portion 20.

  In step S3B, as shown in FIG. 4, the upper outer periphery scaffolding 60 as a temporary wall covering the outer periphery of the new installation portion 20 is set on the rooftop floor, that is, (m + 1), using a frame of the new installation portion 20 or a crane (not shown) provided outside. ) Install at the height of one layer above the floor level of the floor. Specifically, a temporary floor 61 that protrudes outward from the new portion 20 is provided on the outer periphery of the upper end of the new beam 22, and the temporary scaffold 62 that is a frame scaffold is suspended and supported from the temporary floor 61. Thereby, the upper outer periphery scaffolding 60 is constructed on the rooftop floor, that is, the (m + 1) floor, and the space surrounded by the upper outer periphery scaffolding 60 is formed as a new construction work space 63.

In step S <b> 4 </ b> B, as shown in FIG. 5, a non-structural body of the newly installed portion 20 is constructed in the new work space 63.
Specifically, the new floor slab 24, the new outer wall 23, and the new partition wall 25 are constructed in the new work space 63, or new equipment not shown is installed.

In step S5B, as shown in FIG. 5, a structure for one layer of the new building 2 is constructed on the new work space 63.
Specifically, the new column 21 is built in the new floor slab 24, the new beam 22 is installed, and a new column beam frame is constructed.
As a result, the upper end of the newly installed beam 22 becomes the floor level of the (m + 3) floor of the newly installed portion 20.

In step S6B, as shown in FIG. 6, by using a crane (not shown) provided inside the newly installed part 20, the upper outer periphery scaffold 60 is moved upward by one layer, so that the new work space 63 is also only one layer. Move upward. That is, a new temporary floor 61 is provided on the (m + 3) floor, and then the temporary scaffold 62 is moved upward and supported by being suspended from the new temporary floor 61.
In step S7B, as shown in FIG. 7, steps S4B and S5B described above are performed. That is, in the new work space 63, a new outer wall 52 is constructed or a new facility device (not shown) is installed.

  In step S8B, the above steps S6B to S7B are repeated as one set, and new construction work is performed toward the upper floor.

According to this embodiment, there are the following effects.
(1) On the same floor, the existing building 1 is demolished, and at the same time, a new building 2 is constructed using a part of the existing building 1. At this time, the outer scaffolds 30 and 60 are provided so as to surround the existing building 1, and the outer wall portions are operated using the outer scaffolds 30 and 60.
Therefore, since the new work space 63 and the renovation work space 33 can be constructed only by providing the outer periphery scaffolds 30 and 60, the new work space 63 and the renovation work space 33 can be constructed with a small amount of temporary material, and the cost is low.

In addition, since the new building 2 higher than the existing building 1 is constructed while dismantling the existing building 1, the construction period is shorter than when constructing the new building after the dismantling of the existing building is completed as in the past. In addition to renovation, the cost of renovation can be reduced.
In addition, since the new work space 63 is surrounded by the upper outer periphery scaffold 60 and the renovation work space 33 is surrounded by the lower outer periphery scaffold 30, it is possible to prevent dust from being scattered around when the existing building 1 is dismantled. Noise can be reduced, and dismantling material can be prevented from falling. Thus, the load on the surrounding environment can be reduced.

Moreover, since the new building 2 was constructed by reusing a part of the existing building 1, the amount of dismantling material can be reduced and the load on the environment can be reduced.
In addition, when working at a high place, if a tower crane or jib crane is used, the work efficiency decreases due to the influence of wind, but the outer scaffolds 60 and 30 are not affected by the wind, so the existing building 1 is efficiently dismantled. it can.

  (3) The weight of the newly installed part 20 is set to be equal to or less than the weight reduced by the reconstruction of the existing building 1. That is, the sum of the weight of the existing building 1 after the renovation and the weight of the new part 20 is set to be equal to or less than the weight of the existing building 1 before the renovation. Therefore, it is not necessary to add a foundation for constructing the new building 2, and the cost is reduced.

(3) Since the existing floor slab 13 of the existing building 1 has been removed as a means to reinforce the reuse structure 40, the weight of the upper part of the existing building 1 is reduced and the horizontal load applied to the new building 2 during an earthquake ( (Inertial force against the weight of the top of the building) can be reduced.
Moreover, since the reinforcement pillar 51 was added around the existing pillar 11 of the existing building 1, the intensity | strength of the pillar of the new building 2 can be increased because the existing pillar 11 is reinforced with the reinforcement pillar 51.
Moreover, when the seismic isolation device is incorporated in the existing pillar 11, the new building 2 including the existing building 1 after the reconstruction can be easily seismically isolated.

  (4) Since the outer perimeter scaffolds 60 and 30 are configured including the temporary floors 61 and 31 and the temporary scaffolds 62 and 32, the temporary floors 61 and 31 are newly constructed above and below the current temporary floors 61 and 31, The outer scaffolds 60 and 30 can be easily moved up and down simply by changing the temporary scaffolds 62 and 32 to the new temporary floors 61 and 31.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in this embodiment, each of the outer scaffolds 60 and 30 is installed at a height of one layer. However, the present invention is not limited to this, and a temporary scaffold is unitized and each outer scaffold is installed at a height of a plurality of layers. Also good.
In addition, before steps S2A and S2B, there may be provided a step of completely dismantling from the roof floor to a predetermined floor of the existing building 1 to reduce the building height of the existing building 1. If it does in this way, since the existing building 1 will be demolished to the predetermined floor before step S2, the building height of a new building will be made lower than the existing building 1, or the existing building 1 after a reconstruction will occupy the new building The ratio of the part can be lowered.

  Further, when the floor height is changed by removing the existing floor slab 13, support means such as a support, a jack, and a receiving material for supporting the existing floor slab 13 are provided immediately below the existing floor slab 13. The joint part of 12 and the existing floor slab 13 may be cut | disconnected, and the existing floor slab 13 may be disassembled. Furthermore, when the existing large beam 12 can also be removed, the existing large beam 12 and the existing floor slab 13 may be disassembled simultaneously.

1 ... Existing building (existing structure)
2 ... New building 11 ... Existing pillar 12 ... Existing beam 13 ... Existing floor slab 14 ... Existing outer wall 15 ... Existing partition wall 20 ... New installation (new structure)
21 ... New pillar 22 ... New beam 23 ... New outer wall 24 ... New floor slab 25 ... New partition wall 30 ... Lower outer periphery scaffolding (lower temporary wall)
DESCRIPTION OF SYMBOLS 31 ... Temporary floor 32 ... Temporary scaffolding 33 ... Reconstruction work space 40 ... Reuse structure 50 ... Carbon sheet 51 ... Reinforcement pillar 52 ... New outer wall 53 ... New floor slab 54 ... New partition wall 60 ... Upper outer periphery scaffold (upper temporary scaffolding wall )
61 ... Temporary floor 62 ... Temporary scaffolding 63 ... New work space

Claims (4)

A method for reconstructing a structure in which an existing structure is reconstructed and a new part is constructed on the existing structure,
On the rooftop floor of the existing structure, construct at least a part of the structure of the new part, and support the upper temporary wall supported by the structure and covering the outer periphery of the new part above the floor level of the rooftop floor. a new construction initial step of constructing a new work space that is constructed at a height of n (n is a natural number) layers and surrounded by the upper temporary wall;
Constructing the rest of the newly established part in the newly constructed work space, and constructing at least a part of the structure of the newly established part on the newly constructed work space; and
A new construction repeating step of forming the new work space upward by moving the upper temporary wall upward by n layers and supporting the structure, and repeating the new work step in the new work space; , In order new construction process,
A renovation work in which a lower temporary wall covering the outer periphery of the existing structure is erected at a height of n layers below the floor level of the roof of the existing structure and surrounded by the lower temporary wall Renovation initial process to form space,
In the remodeling work space, at least a part of the structure is a reuse structure, and the existing structure is dismantled except for the reuse structure, and a remodeling work process for reinforcing the reuse structure,
The lower temporary wall is moved downward by n layers to form the renovation work space downward, and the renovation repetitive process for sequentially repeating the renovation work process in the renovation work space. A process,
A structure reconstructing method, wherein the new reconstructing process is performed and the reconstructing process is performed.   The dismantling process of disassembling from the roof floor of the existing structure to a predetermined floor and lowering the building height of the existing structure before the new construction process and the renovation process is further provided. The structure reconstruction method according to 1.   3. The method for reconstructing a structure according to claim 1 or 2, wherein the weight of the newly installed portion is equal to or less than a weight reduced by remodeling the existing structure.   In the reconstruction process, as means for reinforcing the reuse structure, floor slabs of the existing structure are removed, reinforcement columns are added around the existing columns of the existing structure, and the existing structure The method for reconstructing a structure according to any one of claims 1 to 3, wherein at least one of the seismic isolation devices is incorporated into an existing pillar.

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