JP4359570B2 - Rebuilding method - Google Patents

Description

  The present invention relates to a building rebuilding method for demolishing an old building having an underground floor and forming a new building within the range.

Conventionally, as a first example of this type of building rebuilding method (hereinafter referred to as a first known example), as shown in FIG. 7, the outer peripheral wall 4 part of the existing underground structure 1A of the old building 1 is reinforced. At the same time, after filling the bottom pit layer 3 with concrete to reinforce it, the other existing underground structure 1A was demolished and removed. And after forming the retaining wall part 7 and the floor slab part 8 used as the new underground structure part 2A in the removed space, the new building 2 is formed on the said new underground structure part 2A (for example, patent document) 1).
In addition, as a second example of a conventional building rebuilding method (hereinafter referred to as a second known example), a part of the existing underground structure part of the old building is demolished and a part of the old underground structure part is demolished. A new underground structure was formed and a new building was formed thereon (see, for example, Patent Document 2).
As a third example of a conventional building rebuilding method (hereinafter referred to as a third known example), as shown in FIG. 8, when the existing underground structure 1A of the old building 1 is removed, By leaving one span of the upper floor outer frame of No. 1, the earth pressure was temporarily received when the inner side was demolished (see, for example, Patent Document 3).
As a fourth example of a conventional building rebuilding method (hereinafter referred to as a fourth known example), as shown in FIG. 9, when the existing underground structure 1 </ b> A of the old building 1 was removed, the bottom of the excavation bottom was reinforced. After that, a pile for mega frame is placed by penetrating the bottom plate, and the existing underground structure 1A is rebuilt while forming a mega frame for the new ground structure 2B on the pile (see, for example, Patent Document 4). It was a thing.
As a fifth example of a conventional building rebuilding method (hereinafter referred to as a fifth known example), as shown in FIG. 10, when the existing underground structure part 1A of the old building 1 is removed, the existing ground structure part 1B is demolished. While filling the existing underground structure part 1A into the existing underground structure part 1A (see FIG. 10 (a)), it is backfilled up to a predetermined floor to be the basis of the new underground structure part 2A (see FIG. 10 (b)), The new building 2 was constructed starting with the new underground structure 2A (see, for example, Patent Document 5).

JP 2001-303599 A (FIGS. 2 to 6) Japanese Patent No. 2926109 (FIGS. 1 and 2) Japanese Patent Laying-Open No. 2004-44223 (paragraph number [0025]) JP-A-11-193641 (FIGS. 1 to 5) JP 11-336335 A (FIGS. 1 to 3)

According to the building rebuilding method of the first example described above, for reinforcing the outer peripheral wall portion of the existing underground structure part of the old building, the existing underground structure part located in the underground space is demolished and removed over the entire depth. However, there is a problem that the outer peripheral wall needs to be strong enough to receive the earth pressure stably, and it is likely to be a large-scale construction, and the construction time and construction cost are likely to be increased.
It should be noted that the above-mentioned outer peripheral wall can be stably subjected to earth pressure, including the safety measures in the event of an earthquake or the like as well as normal times.
According to the building rebuilding method of the second example described above, the part that forms the new underground structure part is demolished in advance from the existing underground structure part of the old building. There is a risk that the earth pressure cannot be sufficiently supported, for example, there is a problem that the safety factor tends to be extremely low when an earthquake or the like occurs.
As for the building rebuilding method of the third example described above, as in the second example, when removing the existing underground structure part of the old building, the upper floor in the existing underground structure part left in the underground space Only one span of the frame will be subjected to side earth pressure. In that state, there is a risk that earth pressure from the side or from below cannot be fully supported. For example, safety in the event of an earthquake, etc. There is a problem that the rate tends to be extremely low.
According to the building rebuilding method of the fourth example described above, when the existing underground structure part of the old building is removed, the bottom of the excavation base is reinforced, but the outer peripheral wall is not necessarily reinforced. There is a problem that tends to cause a lack of drag against the lateral earth pressure throughout the formation process of the underground structure.
According to the building rebuilding method of the fifth example described above, when the existing underground structure part of the old building is removed, the existing underground structure part is filled with galley generated by the demolition of the ground structure part, and then backfilled to a predetermined floor. Thus, while it is easy to counter the earth pressure from below, the side earth pressure is not reinforced at all, and in that state there is a risk that the side earth pressure cannot be sufficiently supported, In the event of an earthquake, the safety factor tends to be extremely low.

  Therefore, the object of the present invention is to solve the above-mentioned problems, and can receive the earth pressure throughout the rebuilding process of the underground structure part without carrying out a large earth retaining reinforcement work, so that a stable earth pressure can be obtained. The object of the present invention is to provide a building rebuilding method capable of rebuilding a building in a supported state.

A first characteristic configuration of the present invention is a building rebuilding method in which an old building having an underground floor is demolished and a new building is formed within the range, and an existing underground structure portion of the old building is subjected to lateral earth pressure. The interfering part of the existing underground structure part is formed in a heavy box shape integrally with the retaining wall part and the floor slab part, which becomes the new underground structure part, while being left in a state of receiving the existing underground structure part. After the side earth pressure received by the structure part is received by the retaining wall part, the inside is rebuilt to the basement structure part and a new building is formed on the new underground structure part.

According to the first characteristic configuration of the present invention, at the time of forming the new underground structure part, as in the case before the rebuilding method is performed, the existing underground structure part of the old building is subjected to lateral earth pressure. For example, even if a large external force is applied due to an earthquake or the like at that time, it can be countered by the existing underground structure.
Therefore, compared to the method in which the existing underground structure part is completely demolished and then the new underground structure part is formed, the earth pressure is reduced throughout the rebuilding process of the underground structure part without carrying out extensive earth retaining reinforcement work. The building can be rebuilt with stable earth pressure support.
In addition, the existing underground structure remaining outside the new underground structure can be left as it is, and in that case, the external force burden on the new underground structure is substantially reduced by the external force burden caused by the remaining existing underground structure. Therefore, safety can be further improved. Of course, after the formation of the new underground structure part, it is possible to freely select the existing underground structure part left on the outer side to be demolished or backfilled.
On the other hand, the existing underground structure part remaining inside the new underground structure part can also be completely removed, partially removed, reinforced and reused, or freely selected.
Thus, according to the present invention, rebuilding of a building can be performed more safely and economically.

  The second characteristic configuration of the present invention is that the new underground structure portion is designed such that a portion of the member through which the existing underground structure portion penetrates is not considered in terms of stress.

According to the 2nd characteristic structure of this invention, in addition to being able to achieve the above-mentioned effect by the 1st characteristic structure of this invention, the part which the existing underground structure part penetrates among the new underground structure parts Since no consideration is given to stress, the new underground structure section alone can receive a predetermined load regardless of whether or not the existing underground structure section is present , and a predetermined safety factor can be ensured. Therefore, the existing underground structure can be left or removed according to the site situation and can be freely selected, thereby realizing a smooth site response.
Moreover, when the existing underground structure part left in the part corresponding to the window part is in a state where stress can be borne, the strength safety is further improved.

  The third characteristic configuration of the present invention is that the new underground structure portion is designed such that the existing underground structure portion remaining inside is designed as a structural member that contributes to stress.

  According to the third characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effects according to the first or second characteristic configuration of the present invention, the structural member formed inside the new underground structure portion The existing underground structure can be reused, and the material cost can be reduced.

  According to a fourth characteristic configuration of the present invention, the floor slab is a flat slab.

  According to the fourth characteristic configuration of the present invention, in addition to being able to achieve the above-described operational effect according to any one of the first to third characteristic configurations of the present invention, no beam shape is generated on the floor slab portion. Therefore, it becomes possible to use the new underground structure part for a wider range of usage.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.

FIG. 1 shows a state before and after rebuilding a building that employs the “building rebuilding method” of the present invention.
FIG. 1 (a) shows the old building 1 before rebuilding, and FIG. 1 (b) shows the new building 2 after rebuilding.

As shown in FIG. 1 (a), the old building 1 includes a plurality of existing underground structure parts 1A and an existing ground structure part 1B.
In the present embodiment, the existing underground structure portion 1A includes an underground floor having three levels and an underground pit layer 3 provided below the floor.
On the other hand, the existing ground structure 1B is composed of a ground floor composed of many layers.
And while receiving the side earth pressure in the outer peripheral wall part 4 of the existing underground structure part 1A, the earth pressure from the downward direction is received in the board | substrate part 5 under the underground pit layer 3. FIG.

As shown in FIG. 1B, the new building 2 is formed inside the existing underground structure 1 </ b> A of the old building 1 and has a smaller building area than the old building 1. And the new building 2 is comprised including the new underground structure part 2A and the new ground structure part 2B of multiple floors.
In this embodiment, the new underground structure 2A includes an underground floor having two levels, a base isolation layer 6 provided below the floor, a retaining wall 7 capable of receiving lateral earth pressure, A floor slab portion 8 that supports the seismic isolation layer 6 and can receive the earth pressure when the earth pressure acts from below is provided.
On the other hand, the new ground structure portion 2B is composed of a ground floor composed of many layers.
The underground pit layer 3 of the old building 1 is reinforced by being filled with a filler such as concrete, and an integrated heavy box-shaped structure is formed on the upper portion thereof by the retaining wall portion 7 and the floor slab portion 8. Is configured. Further, the floor slab portion 8 adopts a flat slab structure, and the height dimension can be made thinner than a structure in which a beam is provided, and a limited underground space can be used more effectively. ing. In addition, the degree of freedom for splitting the new building has improved dramatically.
As shown in the figure, the seismic isolation layer 6 is provided with seismic isolation devices 9 in accordance with the positions of the pillars of the new building 2, on which the basement floor and the new ground structure unit are located. 2B is erected.
Incidentally, the existing underground structure 1A is left between the retaining wall 7 and the outer peripheral wall 4, and when the old building 1 is demolished in the remaining space in the existing underground structure 1A. The demolition glass and concrete for filling are filled. The retaining wall portion 7 and the floor slab portion 8 have a portion through which a part of the beam, column, etc. of the existing underground structure portion 1A penetrates, but in the design calculation of the retaining wall portion 7 and the floor slab portion 8 The through portion is handled as a window portion, and consideration is given to avoiding insufficient strength.

Next, the rebuilding method from the old building 1 to the new building 2 will be described.
[1] Demolition starts from the existing ground structure 1B of the old building 1 (see FIG. 2).
At that time, a part of the dismantling glass generated by the demolition is filled in the underground pit layer 3 and integrated with concrete.
[2] In parallel with the demolition of the existing ground structure portion 1B, in the underground, the floor slab portion 8 is formed in a state where the interfering portion is taken in while leaving the existing underground structure portion 1A (see FIG. 3).
[3] The retaining wall portion 7 is formed integrally with the floor slab portion 8 at a predetermined position in the existing underground space (see FIG. 4). Similarly to the floor slab portion 8, the retaining wall portion 7 is formed in a state of taking in the interfering portion while leaving the existing underground structure portion 1 </ b> A. Therefore, the formation work of the new underground structure part 2A can be advanced in a state where a sudden earth retaining force is not released, and the safety is further improved.
[4] The existing underground structure portion left in the range surrounded by the floor slab portion 8 and the retaining wall portion 7 is removed (see FIG. 5). Since there are no beams or the like in the removed underground space, the construction work of the new building 2 thereafter can be carried out very efficiently.
[5] The new building 2 is completed by sequentially forming the seismic isolation layer 6, the underground floor, and the ground floor.

  According to the building rebuilding method of the present embodiment, the earth pressure from the side and below can be received through the entire rebuilding process of the underground structure part without carrying out large earth retaining reinforcement work, etc. It becomes possible to carry out the rebuilding of the building economically with the supported earth pressure.

[Another embodiment]
Other embodiments will be described below.

<1> The old building 1 and the new building 2 are not limited to the structures, scales, and shapes described in the previous embodiment, and can be designed according to the situation. For example, the new building 2 has been described as an example of a base-isolated building, but may not be a base-isolated building. For example, the new building 2 may adopt an earthquake-resistant structure, a vibration-damping structure, or another earthquake countermeasure structure. Also good. Of course, the old building 1 may have a seismic isolation structure, a vibration control structure, or another earthquake countermeasure structure.
<2> The example in which the new underground structure portion 2A is provided within the range of the existing underground structure portion 1A has been described. However, a part of the retaining wall portion 7 of the new underground structure portion 2A is the outer periphery of the existing underground structure portion 1A. It can also be formed at the same position as the wall 4.
<3> Further, in the previous embodiment, the description has been given of the case where the underground floor of the new building is formed as a separate body in the inner space surrounded by the retaining wall portion 7, but for example, as shown in FIG. The underground floor may be formed integrally with the portion 7, and the new ground structure portion 2 </ b> B may be integrally formed thereon. And new underground structure part 2A can also reinforce existing underground structure part 1A, and can reuse it.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

Front sectional view showing before and after rebuilding the building Front sectional view explaining the rebuilding procedure of the building Front sectional view explaining the rebuilding procedure of the building Front sectional view explaining the rebuilding procedure of the building Front sectional view explaining the rebuilding procedure of the building Front view sectional drawing which shows the building of another embodiment Front sectional view showing a conventional building Front sectional view showing a conventional building Front sectional view showing a conventional building Front sectional view showing a conventional building

Explanation of symbols

1 Old building 1A Existing underground structure 2 New building 2A New underground structure 7 Retaining wall 8 Floor slab

Claims (4)

A method of rebuilding a building that dismantles an old building with a basement floor and forms a new building within its scope,
The old building of the existing underground structure, leaving in the state of undergoing lateral earth pressure, the interfering part of the existing underground structure portion is a new underground structure in the state captured retaining wall portion and a floor slab Are formed in a heavy box shape integrally, and after receiving the lateral earth pressure received by the existing underground structure portion by the retaining wall portion, the inside is rebuilt to the new underground structure portion, and the new underground structure A method of rebuilding a building that forms a new building on the club.   2. The building rebuilding method according to claim 1, wherein the new underground structure part is designed as a window part in which the existing underground structure part penetrates among the members, in consideration of stress.   The said new underground structure part is the building rebuilding method of Claim 1 which designs the existing underground structure part part which remains inside as a structural member which contributes on stress.   The said floor slab part is a flat slab, The building rebuilding method as described in any one of Claims 1-3.

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