JP5303381B2 - Demolition method for existing buildings - Google Patents

Description

  The present invention relates to a demolition method for an existing building.

The following demolition methods are known as conventional demolition methods for existing buildings. That is, as shown in FIGS. 9A and 9B, first, the ground portion 12 of the existing building 11 is first disassembled, and then the area 3 where the existing outer wall portion 2 of the underground portion 1 can stand independently is left without dismantling. The structure 4 on the center side with respect to the range 3 is dismantled.
After that, the entire GL (ground line) is completely backfilled, and then underground obstacles are removed from the newly built underground outer wall, and the mountain is fixed.

  Japanese Patent Laid-Open No. 2000-204574 discloses a method for remodeling an underground structure that allows a new underground structure to be constructed while dismantling an existing underground outer wall (see Patent Document 1).

JP 2000-204574 A

  In the dismantling method of the conventional example, since the range 3 where the existing outer wall 2 can stand independently is left without being dismantled, the dismantling range is limited, resulting in a long construction period. Yes.

  In addition, since the structure 4 on the center side is dismantled, it is completely backfilled up to the GL, and then the underground obstruction removal work, etc. of the newly built underground outer wall is performed, which also takes a long construction period. Become.

  For this reason, the dismantling method in the conventional example has a problem that must be solved by improving workability and shortening the work period.

  The gist of the present invention for solving the problems of the conventional example is a demolition method of an existing building, and at the time of demolition of the ground part of the existing building, a predetermined interval is opened inward from the existing outer wall part of the underground part. Constructing a temporary earth pressure wall at a position, filling backfill soil between the temporary earth pressure wall and the existing outer wall part, and transferring earth pressure from the existing outer wall part to the temporary earth pressure wall, It is to remove underground obstacles in the newly built underground outer wall when demolishing the underground part of the existing building.

Moreover, the construction of the temporary earth pressure wall and the filling of the backfilling soil should be carried out for each floor sequentially from the lowest floor to the upper floor;
Filling the backfilling soil is performed by disassembling a part of the upper slab of each floor and from the dismantling hole;
Providing a temporary retaining wall on the temporary earth pressure wall;
Is included.

  According to the dismantling method of the existing building according to the present invention, since the earth pressure in the ground has been transferred from the existing outer wall portion to the temporary earth pressure wall, the existing outer wall portion can be made independent and up to GL as in the conventional example. It will be possible to remove underground obstacles in the newly built underground outer wall without backfilling, and it will be possible to significantly shorten the construction period.

  In addition, the construction of the temporary earth pressure wall and the filling of the backfilling soil are carried out for each floor sequentially from the lowest floor to the upper floor, and the filling of the backfilling soil is performed by dismantling a part of the upper slab of each floor. By performing from this dismantling hole, the filling property of the backfill soil of each floor is enhanced, and an excellent effect is obtained that the earth pressure from the outer wall portion can be received firmly.

  And the temporary earth pressure wall has the outstanding effect that the intensity | strength of a temporary earth pressure wall improves by providing the retaining wall for reinforcement.

It is sectional drawing of the existing building 11 explaining the construction of the temporary earth pressure wall 14. (A) It is sectional drawing of the existing building 11 explaining the removal construction of the underground obstacle 27. FIG. (B) It is a flowchart explaining the dismantling method of the existing building 11 according to the present invention. FIG. 4 is a cross-sectional view illustrating the construction of a continuous wall 28. 3 is a cross-sectional view of a temporary earth pressure wall 14. FIG. It is a longitudinal cross-sectional view of the temporary earth pressure wall 14 and the existing slab 21. It is a longitudinal cross-sectional view of the outer wall part 16 and the temporary earth pressure wall 14. It is a longitudinal cross-sectional view of the outer wall part 16 and the temporary earth pressure wall 14 in each floor. It is the sectional view on the AA line of FIG. (A) It is sectional drawing of the existing building 11 explaining the dismantling method of a prior art example. (B) It is a flowchart figure explaining the work procedure of the dismantling method of a prior art example.

  When demolishing an existing building, the purpose of shortening the work period is to replace the underground pressure in the ground from the existing outer wall to a temporary earth pressure wall, allowing the existing outer wall to be self-supporting. This was realized by removing the underground obstacles in the newly constructed underground outer wall without backfilling up to.

  Next, embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 is a cross-sectional view of an existing building 11, and when the ground portion 12 of the existing building 11 is dismantled, temporary earth pressure is provided at a position spaced a predetermined distance inward from the existing outer wall portion 16 of the underground portion 17. The wall 14 is constructed (see FIG. 2B).

  Then, the backfilling soil 15 is filled between the temporary earth pressure wall 14 and the existing outer wall part 16, and the earth pressure is transferred from the existing outer wall part 16 to the temporary earth pressure wall 14 so that the existing outer wall part 14 can be independent. To.

  After completion of the dismantling of the ground portion 12, as shown in FIG. 2 (a), the underground portion 17 is disassembled and the underground obstacle 27 is removed from the newly constructed underground outer wall (see FIG. 2 (b)). ). In this case, the existing outer wall portion 16 can be self-supporting as described above, and the underground obstacle 27 can be removed without backfilling up to the GL.

  After completion of the removal work of the underground obstacle 27, as shown in FIG. 3, the construction (mounting work) of the continuous wall 28 is started after the backfill 13 of the part is completed (see FIG. 2B). That is, after carrying in heavy machinery, excavation is performed with an auger, cement milk is poured in, H steel is driven in, and steps such as formation of the continuous wall 28 are performed, and further, a new building is constructed by a reverse driving method.

  Next, a method for constructing the temporary earth pressure wall 14 and the retaining wall 14a will be described. As shown in FIGS. 4 and 5, a reinforcing bar 19 is arranged at a position spaced from the existing outer wall portion 16 by a predetermined interval, and the mold 20 is installed. The distance between the existing outer wall portion 16 and the temporary earth pressure wall 14 is about 100 to 200 cm, for example.

  The upper existing slab 21 is cored and provided with a through hole 22, and a reinforcing bar 23 is inserted into the through hole 22, and the reinforcing bar 23 is jointed with a reinforcing bar 24 on the lower floor and a reinforcing bar 25 on the upper floor ( (See FIG. 5). By configuring in this way, not only the anchor cost can be reduced, but also the through hole 22 serves as an air vent hole when the concrete is placed, so that the filling property of the concrete can be improved. Then, concrete is cast from the through hole 29 to construct the temporary earth pressure wall 14 and the retaining wall 14a.

  Next, as shown in FIG. 6, a part of the upper slab 18 is disassembled to form a dismantling hole 26, and the backfill soil 15 is filled from the dismantling hole 26. Specifically, the backfilling soil 15 is a fluidized soil obtained by mixing soil and cement, or a high-quality backfilling soil.

  The construction work of the temporary earth pressure wall 14 and the retaining wall 14a and the filling work of the backfill soil 15 are sequentially performed on each floor from the lowest floor to the upper floor. From the lowest floor to the first basement floor, the temporary earth pressure wall 14 and the retaining wall 14a are constructed in a continuous state and the backfill earth 15 is filled (see FIG. 7), and the temporary earth pressure wall 14 becomes the existing outer wall portion. The earth pressure from 16 can be received firmly.

  Further, as shown in FIG. 8, the temporary earth pressure wall 14 is formed with a reinforcing retaining wall 14a at a predetermined interval, so that the strength of the temporary earth pressure wall 14 is improved.

  As described above, the dismantling method of the existing building 11 constructs the temporary earth pressure wall 14 and replaces the earth pressure in the ground from the existing outer wall part 16 to the temporary earth pressure wall 14. It can be self-supporting, and it will be possible to remove underground obstacles from the newly built underground outer wall without backfilling up to the GL, and the construction period can be greatly shortened.

DESCRIPTION OF SYMBOLS 1 Underground part 2 Existing outer wall part 3 The range which can become independent 4 Central structure 11 Existing building 12 Ground part 13 Backfill 14 Temporary earth pressure wall 14a Retaining wall 15 Backfill soil 16 Existing outer wall part 17 Underground part 18 Upper slab 19 Reinforcing bar 20 Formwork 21 Existing slab 22 Through hole 23, 24, 25 Reinforcing bar 26 Demolition hole 27 Underground obstacle 28 Continuous wall 29 Through hole

Claims (4)

An existing building demolition method,
When dismantling the ground part of the existing building, construct a temporary earth pressure wall at a position spaced inward from the existing outer wall part of the underground part,
Filling backfill soil between the temporary earth pressure wall and the existing outer wall part, and exchanging earth pressure from the existing outer wall part to the temporary earth pressure wall,
A demolition method for an existing building, in which an underground obstacle is removed from the newly constructed underground outer wall when the underground portion of the existing building is demolished. The method for demolishing an existing building according to claim 1, wherein the construction of the temporary earth pressure wall and the filling of the backfilling soil are performed sequentially from the lowest floor to the upper floors. 2. The method for demolishing an existing building according to claim 1, wherein the filling of the backfilling soil is performed by dismantling a part of the upper slab of each floor and from the dismantling hole. The method of demolishing an existing building according to claim 1, wherein a reinforcing retaining wall is provided on the temporary earth pressure wall.

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