JP2016079596A - Construction method for building with underground base isolation layer, and building constructed by the construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance workability of a process for constructing a base isolation layer, when constructing a building with an underground base isolation layer by a reversed placing method.SOLUTION: A construction method for a building with an underground base isolation layer comprises the following steps for: erecting a reversely placed column 12 in a ground; excavating the ground and constructing a floor frame of a floor above a base isolation layer 20, such that the floor frame is supported by the reversely placed column 12; constructing a base isolation layer floor 22 such that the base isolation layer floor is supported by the reversely placed column 12, when the ground has been excavated to a depth below a depth of the base isolation layer 20; installing a temporary column between the floor frame of the floor above the base isolation layer 20 and the base isolation layer floor 22, for receiving the floor frame of the floor above the base isolation layer 20 with the column; cutting a part of the reversely placed column 12 above the base isolation layer floor 22 while receiving the floor frame of the floor above the base isolation layer 20 with the column, and installing a seismic isolator 24 at a cut part of the reversely placed column 12; and constructing a base isolation foundation 21 above the seismic isolator 24 such that the base isolation foundation is supported by the reversely placed column 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for constructing a building having a base-isolated layer in an underground portion by a reverse driving method, and a building constructed by the construction method.

  As a method for constructing a building having a seismic isolation layer in the basement by a back-strike method, a method described in Patent Document 1 is known. In the method described in Patent Document 1, the base layer is excavated to the final excavation level, the base layer is constructed on the bottom surface of the excavation, the base layer is constructed on the base layer, and then the base layer is separated. A temporary jack is installed between the base and the base and the load on the building is supported by the temporary jack. In this state, the part between the base layer and the base is removed on the back strut. Install a seismic isolation device in the area, and then transfer the building load to the seismic isolation device.

Japanese Patent No. 3648651

  In the method described in Patent Document 1, the ceiling between the seismic isolation floor and the seismic isolation foundation is very difficult for the installation of the temporary jack, the excision of a part of the backlash strut, and the installation of the seismic isolation device. Since it must be carried out in a low (for example, 1.5 m or less) narrow space and the heavy equipment that can be used is limited, there is a problem in workability.

  The present invention has been made in view of the above circumstances, and it is an object to improve the workability of the process of constructing the seismic isolation layer in constructing the building having the seismic isolation layer in the basement by the backlash method. To do.

  In order to solve the above problems, a method for constructing a building having a base isolation layer in the basement according to the present invention includes a base isolation floor, a base isolation device installed on the base isolation floor, and the base isolation A method of constructing a building having an isolation layer in the basement with an isolation base built on top of the device by a back-strike method, a process of building a back strut in the ground, excavating the ground, The step of constructing the floor structure of the upper floor of the seismic isolation layer so as to be supported by the reverse struts, and the stage of excavating the ground below the depth of the seismic isolation layer, the seismic isolation layer floor A step of constructing to be supported by the striking struts, and installing a temporary strut between the seismic isolation layer upper floor and the seismic isolation floor, Receiving the floor frame with the temporary support column, and receiving the seismic isolation of the back strut column with the temporary support column receiving the floor frame of the upper floor of the seismic isolation layer. A part of the floor is excised, and the seismic isolation device is installed on the excised part of the reverse strut, and the base is supported on the reverse strut on the seismic isolation device. And constructing as described above.

  In the method for constructing a building having a base isolation layer in the basement, the floor frame received by the temporary support column may be an uppermost floor frame supported by the counter-strike column.

  A building according to the present invention is constructed by the construction method described above.

  ADVANTAGE OF THE INVENTION According to this invention, when constructing | assembling the building which has a base isolation layer in a basement part by the reverse driving method, the workability | operativity of the process of constructing a base isolation layer can be improved.

It is an elevation sectional view showing a schematic structure of an underground structure according to an embodiment. It is an elevation sectional view showing the procedure of rebuilding a building having an underground part. It is an elevation sectional view showing the procedure of rebuilding a building having an underground part. It is an elevation sectional view showing the procedure of rebuilding a building having an underground part. It is an elevation sectional view showing the procedure of rebuilding a building having an underground part. It is an elevation sectional view showing the procedure of rebuilding a building having an underground part. It is an elevation sectional view showing the procedure of rebuilding a building having an underground part. It is an elevation sectional view showing the procedure of rebuilding a building having an underground part. It is an elevation sectional view showing the procedure of rebuilding a building having an underground part.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an elevational cross-sectional view showing an underground portion 10 of a building constructed by a reverse driving method according to an embodiment. As shown in this figure, the basement 10 includes a base isolation layer 20 that uses a beam under the floor of the first basement floor as a base isolation base 21. The underground portion 10 includes a pile 11 constructed deeper than the bottom of the excavation, a reverse strut 12 with a lower end embedded in the pile 11, a foundation 13 constructed on the excavation bottom, a floor 14 and a beam 15 on each floor. And. In addition, a mountain retaining wall 1 is constructed around the underground portion 10. The counter strut 12 is a steel frame such as cross H-shaped steel or steel pipe.

  The base isolation layer 20 includes the base isolation base 21, the base isolation floor 22 constructed under the base isolation base 21, the base isolation wall 23 built around the outer periphery of the base isolation floor 22, A plurality of seismic isolation devices 24 arranged in the space between the seismic foundation 21 and the seismic isolation floor 22 are provided. The seismic isolation floor 22 is a reinforced concrete structure or a steel-framed reinforced concrete structure, and is supported by the back strut 12. Moreover, the outer peripheral part of the seismic isolation layer floor 22 extends to the mountain retaining wall 1, and the seismic isolation retaining wall 23 is constructed facing the mountain retaining wall 1. Here, a space is formed between the outer periphery of the base isolation base 21 and the base isolation retaining wall 23, and the base of the base isolation base 21 is cut from the base isolation floor 22 and the base isolation retaining wall 23. It is in a state.

  The striking strut 12 is divided up and down at a position between the base isolation base 21 and the seismic isolation floor 22, and a seismic isolation device 24 is installed between the upper part and the lower part of the striking strut 12. Has been. The seismic isolation device 24 is a laminated rubber bearing or the like. The lower part of the seismic isolation device 24 is fixed to the seismic isolation floor 22, and the upper part of the seismic isolation device 24 is fixed to the seismic isolation base 21.

  2 to 8 are elevation views showing a procedure for constructing the underground part 10. First, as shown in FIG. 2, the construction of the mountain retaining wall 1 and the pile 11 and the installation of the back struts 12 are carried out, and then the first excavation up to the first floor level 1FL and deeper is excavated. The floor 14 and the beam 15 are constructed. The floor 14 and the beam 15 are integrated with the head of the counter strut 12. In addition, after constructing the floor 14 and the beam 15 on the first floor, the cut beam 2 as a mountain retaining support is installed between the retaining wall 1 and the first-floor frame. Next, as shown in FIG. 3, secondary excavation to a position deeper than the seismic isolation floor 22 is performed to construct the seismic isolation floor 22.

  Next, as shown in FIG. 4, a plurality of floor temporary devices 100 are installed between the seismic isolation floor 22 and the first floor beam 15, and the floor temporary devices 100 allow the floor on the first floor. 14 and the beam 15 are supported. The floor provisional receiving device 100 includes a plurality of support columns 102, a plurality of cross members 104 that connect the upper ends of the plurality of support columns 102, and a plurality of jacks 106 (the same number as the support columns 102) that support these members so as to be movable up and down. Prepare.

  Each floor provisional receiving device 100 is provided for each backlash strut 12 and receives 2 to 4 beams 15 connected to each backlash strut 12. In the inner periphery of the building, four support columns 102 are arranged in a rectangular shape with the back strut 12 as a center. Here, the columns 102 are not disposed directly below the beams 15 and are directly received by the columns 102, but the cross members 104 are disposed so as to be orthogonal to the beams 15, and the beams 15 are It is received by a pair of support columns 102 through 104.

  Further, at the outer periphery of the building, the cross member 104 arranged so as to be orthogonal to the beam 15 is fixed to the mountain retaining wall 1 via another cross member 104 or directly, and the beam 15 is orthogonal to the beam 15. It receives with a pair of support | pillars 102 through the horizontal member 104 arranged so.

  The support column 102 is an H-shaped steel having a smaller cross-sectional dimension (for example, H200 × 200 to H250 × 250) compared to the counter-strut support column 12. The support column 102 may be another steel material such as a steel pipe. Further, the plurality of cross members 104 are steel materials such as H-shaped steel, and are fixed to the beam 15 with bolts or fixing brackets. Moreover, each jack 106 is installed under the support | pillar 102, and when the some jack 106 expands / contracts, the some support | pillar 102 and the horizontal member 104 raise / lower.

  Next, as shown in FIG. 5, the seismic isolation device 24 is installed in the seismic isolation layer 20. In this step, first, a portion of the back strut 12 where the seismic isolation device 24 is installed is excised in a state where the load of the first-floor frame is supported by the floor provisional receiving device 100.

  Here, as shown in FIG. 6, the cut portion 12A of the counter strut 12 is detachably provided between the upper and lower column portions 12B and 12C. Flange portions 12D and 12E are provided at the upper end and lower end of the cut portion 12A, respectively, and flanges 12F and 12G are provided at the lower end of the upper column portion 12B and the upper end of the lower column portion 12C, respectively. The flange 12F is coupled with a bolt, and the flange 12E and the flange 12G are coupled with a bolt.

  In this process, after the upper flanges 12D and 12F are joined with the bolts and the lower flanges 12E and 12G are joined with the bolts, the jack 106 is used to connect the floor frame on the first floor and the upper struts 12 on the upper floor. The cut portion 12A is extracted from between the upper and lower column portions 12B and 12C in a state where the distance between the upper and lower column portions 12B and 12C is increased. Next, as shown in FIG. 7, the seismic isolation device 24 is installed between the upper and lower column parts 12B and 12C, and the first floor case and the upper column part 12B are lowered by the jack 106, and the first floor case and The load of the upper column portion 12B is transferred from the floor provisional receiving device 100 to the lower column portion 12C.

  Next, as shown in FIG. 8, the base 25 of the seismic isolation device 24 and the seismic isolation retaining wall 23 are constructed on the seismic isolation floor 22, and the seismic isolation foundation 21 which is a foundation beam is constructed. The seismic isolation foundation 21 is connected to the lower end of the upper column part 12B. In parallel with this, the third excavation up to the deeper level B2FL of the second basement floor, the construction of the floor 14 and the beam 15 on the second basement floor, and the like proceed. In addition, after building the basement on the second basement, a beam 2 is installed between the retaining wall 1 and the basement on the second basement.

  Here, since the column 102 of the floor provisional device 100 is not arranged directly below the beam 15, the seismic isolation foundation 21, which is a foundation beam, is installed directly below the beam 15 with the floor temporary device 100 installed. Can be built.

  Next, as shown in FIG. 9, the floor provisional receiving device 100 is disassembled. Then, build up the riser on the first basement floor. In parallel with this, the fourth and fifth excavations and the construction of the foundation 13 are advanced.

  As explained above, in the construction method of the underground part 10 of the building according to the present embodiment, first, the back strut 12 is built in the ground, and then the ground is excavated to be the upper floor of the seismic isolation foundation 21. The floor 14 and the beam 15 on the first floor are constructed so as to be supported by the back strut 12. And after excavating the ground below the depth of the base isolation layer floor 22, the base isolation layer floor 22 is constructed.

  Here, in the construction method of the underground part 10 of the building according to the present embodiment, the seismic isolation layer floor 22 is supported by the striking struts 12 when the ground is excavated below the depth of the seismic isolation layer 20. After that, the temporary support column 102 is installed between the floor 14 and the beam 15 on the first floor and the base isolation layer floor 22, and the floor 14 and the beam 15 on the first floor are received by the support column 102. Then, in a state where the first floor 14 and the beam 15 are received by the support column 102, a part of the reverse strut 12 on the seismic isolation layer floor 22 is excised, and the isolated part of the reverse strut 12 is isolated. The device 24 is installed. Thereafter, the base isolation base 21 is constructed on the base isolation device 24 so as to be supported by the back strut 12.

  Here, the height from the seismic isolation floor 22 to the upper end of the seismic isolation foundation 21 is about 2.5 to 3.0 m, whereas the height from the seismic isolation floor 22 to the lower end of the seismic isolation foundation 21. The height is about 1.0 to 1.5 m. Therefore, after the base isolation base 21 is constructed, when performing the operation of excising a part of the reverse strut 12 and installing the seismic isolation device 24 in the excised part of the reverse strut 12, The ceiling must be implemented in a very small space of about 1.0 to 1.5 m, and the heavy equipment that can be used is also limited.

  On the other hand, in the construction method of the underground part 10 of the building according to the present embodiment, the floor of the first floor is provided with the temporary support column 102 between the construction of the seismic isolation floor 22 and the construction of the seismic isolation foundation 21. 14 and the beam 15 are received, a part of the striking strut 12 is excised, and the seismic isolation device 24 is installed in the excised part of the striking strut 12. As a result, the work can be performed in a wide space open to the floor 14 and the beams 15 on the first floor, and the range of selection of usable heavy machinery is expanded. Therefore, the work can be performed with good workability.

  Moreover, in the construction method of the underground part 10 of the building which concerns on this embodiment, the seismic isolation layer 20 is provided in the 1st basement floor. That is, the floor frame received by the temporary support column 102 is only the floor 14 and the beam 15 on the first floor, which is the uppermost floor frame supported by the reverse strut 12.

  Here, as described in Patent Document 1, when the base isolation layer is provided on the foundation of the excavation bottom, a hydraulic jack is provided between the base isolation floor and the base isolation base, and the hydraulic jack While receiving the load of the entire underground skeleton, it is necessary to cut off a part of the striking strut 12 and to install the seismic isolation device 24 in the excised part of the striking strut 12. Therefore, a high-capacity hydraulic jack is required, and the cost increases. In addition, if the load of the underground skeleton is transferred from the hydraulic jack to the seismic isolation device in a state where such a large load is received by the hydraulic jack, if the hydraulic pressure of the hydraulic jack is not managed with high accuracy, a large unbalanced load is applied to the underground skeleton. Acts, and the unbalanced load has a great influence on the underground structure. Accordingly, the accuracy required for the hydraulic pressure management of the hydraulic jack is increased, and the workability is lowered.

  On the other hand, in the construction method of the underground part 10 of the building according to the present embodiment, the floor frame supported by the floor provisional receiving device 100 is only the floor 14 and the beam 15 on the first floor, which is described in Patent Document 1. Compared with this method, the capacity required for the hydraulic jack is remarkably reduced, and the cost can be reduced. Moreover, compared with the case where the seismic isolation layer 20 is provided on the second and third floors, the load acting on the temporary support column 102 is reduced, the rigidity required for the support column 102 is reduced, and the cost can be reduced.

  Further, compared to the case where the seismic isolation layer 20 is provided on the 2nd and 3rd floors of the basement, the load received by the floor temporary support device 100 is reduced, so that the floor isolation device 24 transfers the first floor to the base isolation device 24. When the load on the beam 14 and the beam 15 is changed, the influence on the underground structure due to the uneven load is reduced. Therefore, the accuracy required for the hydraulic management of the hydraulic jack is lowered, and the workability can be improved.

  In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, in the above-described embodiment, the seismic isolation layer 20 is provided on the first basement floor, but may be provided on another basement floor.

DESCRIPTION OF SYMBOLS 1 Yamato wall, 2 Cut beam, 10 Underground part, 11 Pile, 12 Reverse strut, 12A Cut part, 12B, 12C Column part, 12D, 12E, 12F, 12G Flange, 13 Foundation, 14 Floor, 15 Beam, 20 Base-isolated layer, 21 Base-isolated foundation, 22 Base-isolated floor, 23 Base-isolated retaining wall, 24 Base-isolated device, 25 foundation, 100-floor provisional device, 102 Post, 104 Cross member, 106 Jack

Claims (3)

A seismic isolation floor, a base isolation device installed on the base isolation floor, and a building having a base isolation base with a base isolated constructed on the base isolation device by a reverse driving method. A method of building,
The process of erection the back struts in the ground,
Excavating the ground and constructing the upper floor of the seismic isolation layer so that it is supported by the striking struts;
A step of excavating the ground to a level below the depth of the seismic isolation layer, and building the seismic isolation floor so that it is supported by the back struts;
Installing a temporary strut between the upper floor of the seismic isolation layer and the base isolation floor, and receiving the upper floor of the seismic isolation layer with the temporary support;
In a state where the floor support of the upper floor of the seismic isolation layer is received by the temporary support column, a part of the reverse strut column on the seismic isolation layer floor is excised, and the part of the reverse strut support column is excised. The process of installing seismic isolation devices;
Constructing the seismic isolation foundation on the seismic isolation device so as to be supported by the backlash strut;
A method of building a building with a seismic isolation layer in the basement.   The method for constructing a building having a base-isolated layer in the basement according to claim 1, wherein the floor frame received by the temporary column is an uppermost floor frame supported by the counter-strike column.   A building constructed by the construction method according to claim 1 or 2.

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