JP6091809B2 - External reinforcement structure for existing buildings - Google Patents

Description

  The present invention relates to an external reinforcement structure constructed from the outside of an existing building.

  As shown in FIG. 5A, the seismic reinforcement method applied from the outside of the existing building is classified according to the position where the reinforcement frame is attached, as shown in FIG. 5A, the column beam frame (existing column 101, existing beam 102) in the outer peripheral portion of the existing building 100. ) And a column-attached / beam-external type in which a reinforcing frame 110 is installed inside, and a column beam frame (existing column 101, existing beam 102) in the outer peripheral portion of the existing building 100 as shown in FIG. There is a completely external type (see FIG. 5B) in which the reinforcing frame 110 is installed outside (see Non-Patent Document 1).

"External seismic retrofitting manual for existing reinforced concrete buildings-Reinforcement with framed steel braces-" Japan Architecture Disaster Prevention Association, September 2002, pp. 44-46

  Even if the reinforcing frame is directly integrated with the column beam frame on the outer periphery of the existing building, the problem is that the frame concrete of the column beam frame is not strong enough to be tight, and the internal steel material of the column beam frame is There is a problem in that post-installed anchors, PC steel materials, and the like cannot be driven because of the high-density reinforcement.

  Moreover, even if an anchor or a PC steel material is driven into the extended balcony or the end of a small beam to attempt to attach a reinforcing frame, it cannot be constructed if the site is small. In addition, when a balcony or the like is extended, there is a problem that the construction period becomes long and the construction cost becomes high.

  In general, a reinforcing frame arranged on the balcony and the outer periphery of an existing building is provided with a reinforcing column and a reinforcing beam at an elevation position corresponding to the existing frame. In this case, with respect to the reinforcing column, the column cross-sectional size was increased and a high-density bar arrangement amount was required so that buckling failure and shear failure would not occur. Furthermore, the reinforcing beam had to have a beam cross-sectional size that would deform the existing building and the reinforcing frame in the same way when an earthquake occurs.

  The present invention is a structure for seismic reinforcement of an existing building from the outside, by integrating a horizontal member and a reinforcing frame on the outer periphery of the existing building, so that the existing building can be constructed at low cost and with a short construction period without being expanded. An object is to provide an external reinforcing structure.

In order to solve the above problems, an external reinforcing structure for an existing building according to the present invention includes an existing building including a horizontal member attached to the outer peripheral portion of the existing building and a reinforcing frame installed outside the outer peripheral portion of the existing building. a external reinforcing structure, the reinforcing Frame is a disposed a reinforced pillars through said horizontal member is extended in a direction orthogonal to the reinforcing pillars, in the first floor, the top surface of the horizontal member and It is composed of upper and lower reinforcing beams arranged along the lower surface of the upper horizontal member, and the horizontal member and the reinforcing beam are joined to each other.

According to the external reinforcement structure of the existing building, the horizontal force at the time of the earthquake is transmitted between the existing building and the reinforcement frame via the slab, so that the earthquake resistance is excellent.
In addition, by joining the slab and the reinforcing beam to each other, it is possible to reinforce existing buildings without adding a new basic structure, etc., and an external reinforcement structure without being restricted by the bar arrangement of the frame. Can be built.

  In addition, since the reinforcement frame (reinforcement beam) is provided so as to be integrated with the slab, the amount of steel is less than that of the existing external reinforcement structure of the existing building in which the reinforcement frame is integrally formed on the existing frame surface. Seismic performance can be improved.

The horizontal member and the reinforcing beam are joined by an anchor planted on the surface of the horizontal member on the side of the reinforcing beam, a stud material standing on the surface of the side of the reinforcing member on the horizontal member, What is necessary is just to perform by the solidification material which fills between a horizontal member and the said reinforcement beam.
Further , a stud may be erected between the two upper and lower reinforcing beams.
Further, the reinforcing beam may be divided at a specific position in the material axis direction.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the external reinforcement structure which can shorten a construction period at low cost.

  In addition, while using the existing building, without limiting the bar arrangement of the outer column beam structure of the existing building, etc., by integrating the horizontal member attached to the outer periphery of the existing building and the newly installed reinforcement beam, It is possible to reduce the cross-sectional dimension by lowering the effective height of the steel and to install a reinforcing column with a reduced amount of steel.

  Also, by integrating the reinforcing beam with the horizontal member, the cross-sectional size of the reinforcing frame can be designed as a composite of the additional reinforcing beam and the horizontal member, and the existing external frame that directly attaches the reinforcing frame to the existing frame can be designed. Compared to the reinforced structure, it is possible to reduce the cross section of the reinforcing beam to be added, and to reduce the amount of reinforcing bars.

It is a perspective view which shows the external reinforcement structure of the existing building which concerns on embodiment of this invention. It is a front view which shows a part of external reinforcement structure of the existing building shown in FIG. It is sectional drawing which shows a part of external reinforcement structure of the existing building shown in FIG. (A) is AA sectional drawing of FIG. 2, (b) is the elements on larger scale of FIG. It is sectional drawing which shows the seismic reinforcement structure from the outside of the existing building of a prior art example, Comprising: (a) is the outside seismic reinforcement structure of a pillar internal installation type and a beam external attachment type, (b) is an external earthquake resistance reinforcement of a complete external attachment type Structure.

  As shown in FIG. 1, the external reinforcing structure 1 for an existing building according to this embodiment includes a slab (horizontal member) 31 that is attached to the outer periphery of the existing building 30 and a reinforcement that is installed outside the outer periphery of the existing building 30. And a frame 10.

  The reinforcing frame 10 includes a reinforcing column 11, a reinforcing beam 12 extending from a side surface of the reinforcing column 11 in a direction orthogonal to the reinforcing column 11, and an anchor 20 (which is implanted on the surface of the slab 31 on the side of the reinforcing beam 12). 2) and a solidified material 40 filling the space between the horizontal member and the reinforcing beam 12.

  The reinforcing frame 10 is formed with two upper and lower reinforcing beams 12 for each floor (between the upper and lower slabs 31, 31). The left and right reinforcing columns 11, 11 and the upper and lower reinforcing beams 12, 12 A rectangular frame is formed for each floor.

The reinforcing frame 10 is formed adjacent to the outer wall surface or the window frame on the balcony of each floor of the existing building 30.
Although the material which comprises the reinforcement frame 10 (the reinforcement pillar 11 and the reinforcement beam 12) is not limited, In this embodiment, it is comprised with the H-section steel.

  As shown in FIGS. 2 and 3, the reinforcing pillar 11 is disposed through the slab 31.

  The reinforcing column 11 passes through a through hole (penetrating portion) 32 formed in the slab 31. Inside the through hole 32, a joining member 60 for joining the reinforcing pillar 11 and the slab 31 is disposed. In addition, what is necessary is just to arrange | position the joining member 60 as needed.

The reinforcing beam 12 is extended from the upper and lower side surfaces of the reinforcing column 11 in a direction orthogonal to the reinforcing column 11. That is, the upper and lower reinforced beams 12 and 12 are arranged for each floor.
Further, the lower reinforcement beam 12 on the upper floor and the upper reinforcement beam 12 on the lower floor are opposed to each other with the slab 31 sandwiched from the upper surface and the lower surface.

  As shown in FIG. 2, the upper and lower reinforcing beams 12 are disposed with a gap along the lower or upper surface of the upper and lower slabs 31, respectively.

  The distance between the upper and lower reinforcing beams 12 disposed on the same floor is larger than the distance between the slab 31 on the upper floor and the upper reinforcing beam 12, and the existing horizontal beam 31 on the lower floor and the lower reinforcement. Since the distance from the beam 12 is larger, the view from the room is not blocked by the reinforcing beam 12.

  The upper reinforcing beam 12 is horizontally placed between the adjacent reinforcing columns 11 and 11. Although the formation method of the reinforcing beam 12 is not limited, in this embodiment, the reinforcing beam 12 is horizontally mounted by welding the beam member (H-shaped steel) on the side surface of the reinforcing column 11. The reinforcing beam 11 may be formed by horizontally laying one beam member between the reinforcing pillars 11 or by connecting a plurality of beam members.

  The lower reinforcing beam 12 of the present embodiment is divided at an intermediate portion. That is, the reinforcing beam 12 extending in a cantilever shape from the side surface of one reinforcing column 11 and the reinforcing beam 12 extending in a cantilever shape from the side surface of the other reinforcing beam 11 are arranged with a space therebetween. Has been. By doing so, an opening such as a passage can be formed in the plane of the reinforcing frame 10. The lower reinforcing beam 12 may be continuous without a gap.

  A stud 13 is erected at the end of the lower reinforcing beam 12. The intermediate column 13 is disposed between the upper and lower reinforcing beams 12 and 12 and supports the middle portion of the upper 12. In addition, what is necessary is just to arrange | position the stud 13 as needed.

A plurality of studs 14, 14,... Are erected on the surface of the reinforcing beam 12 on the slab 31 side.
In the present embodiment, studs 14, 14,... Are arranged in a section between the reinforcing pillar 11 and the intermediate pillar 13. The section in which the stud 14 is disposed is not limited. For example, with respect to the upper reinforcing beam 12, the stud 14 may be erected over the entire length of the beam.

  The gap between the reinforcing beam 12 and the slab 31 is filled with a solidifying material 40 in the section where the studs 14, 14,. Although the material which comprises the solidification material 40 is not limited, In this embodiment, a non-shrink mortar is used. Further, the solidifying material 40 may be filled with respect to the entire length of the reinforcing beam 12.

As shown in FIGS. 4A and 4B, the stud material 14 is fixed to the solidified material 40 while being embedded in the solidified material 40.
In the present embodiment, as shown in FIG. 4A, the plurality of stud materials 14, 14,... Are arranged in a staggered manner, but the arrangement of the stud materials 14 is not limited. It may be arranged in a row. Moreover, the material which comprises the stud material 14 is not limited.

As shown in FIG. 3, the slab 31 constitutes a part of the frame structure of the existing building 30 and is integrally connected to the pillar 33 and the beam 34.
The slab 31 of the present embodiment is a slab that cantilevered from the slab in the existing building 30 and constitutes a floor portion of a balcony formed outside the existing building 30.

As shown in FIGS. 4A and 4B, a plurality of anchors 20, 20,... Are implanted on the upper surface and the lower surface of the slab 31.
A plurality of anchors 20 are disposed along a pair of reinforcing beams 12, 12 disposed above and below the slab 31.

  In this embodiment, anchors 20, 20,... Are arranged in a section between the reinforcing pillar 11 and the intermediary pillar 13. The section in which the anchor 20 is disposed is not limited. For example, for the upper reinforcing beam 12, the anchor 20 may be disposed over the entire length of the beam.

The anchor 20 is embedded in a bottomed anchor hole 35 formed in the slab 31, as shown in FIG.
A gap between the anchor 20 and the anchor hole 35 is filled with a solidifying material 51 such as non-shrink mortar.

As shown in FIG. 1, the slab 31 is formed with a through hole 32 for arranging the reinforcing pillar 11.
The through hole 32 has a shape larger than the cross-sectional shape of the reinforcing column 11. In the present embodiment, the through hole 32 is formed in a rectangular shape, but the shape of the through hole 32 may be, for example, a circle and is not limited.

  The gap between the through hole 32 and the reinforcing column 11 is filled with the joining member 60 and the solidifying material 52 as shown in FIG. 2 or FIG. Although the material which comprises the solidification material 52 is not limited, In this embodiment, a non-shrink mortar is used.

Next, the construction method of the external reinforcement structure of this embodiment will be described.
The external reinforcing structure construction method includes a removal process, a planting process, a reinforcing frame installation process, and a filling process.

  The removal step is a step of removing a part of the slab 31 to form a through hole (through portion) 32.

The planting process is a process of planting a plurality of anchors 20, 20,.
The anchor 20 is implanted by forming an anchor hole 35 in the slab 31 and embedding it in the anchor hole 35.

  The reinforcing frame installation process is a process of arranging the reinforcing beams 12 along the upper surface and the lower surface of the slab 31.

In the reinforcing frame installation step, first, the reinforcing column 11 is erected in a state where the reinforcing column 11 is inserted into the through hole 32.
Next, the reinforcing beam 12 is disposed between the adjacent reinforcing columns 11 and 11.
The reinforcing beam 12 is arranged by welding the beam member to the side surface of the reinforcing column 11.

  When the upper and lower reinforcing beams 12 are disposed, the stud 13 is erected. The upper end of the stud 13 is fixed to the upper reinforcing beam 12, and the lower end of the stud 13 is fixed to the lower reinforcing beam 12.

  The filling step is a step of filling the solidified material so that the anchor 20 is caught in the gap between the slab 31 and the reinforcing beam 12.

  According to the external reinforcing structure 1 of the present embodiment, the slab 31 and the reinforcing beam 12 can be integrated. Therefore, the seismic performance can be enhanced by transmitting the horizontal force during the earthquake between the existing building 30 and the reinforcing frame 10 via the slab 31.

Since the reinforcing frame 10 is fixed to the slab 31 having a relatively large reinforcing bar pitch compared to the columns 33 and the beams 34, the anchor 20 can be implanted while avoiding the position of the existing reinforcing bars.
Therefore, it is possible to reinforce an existing building without newly adding a foundation structure or the like, and it is possible to construct an external reinforcement structure without being limited by the bar arrangement of the frame.

  Further, since the reinforcement frame 10 (reinforcement beam 12) is provided so as to be integrated with the slab 31, it is less than the conventional external reinforcement structure of the existing building in which the reinforcement frame is integrally extended on the existing frame surface or the like. Seismic performance can be improved by the amount of steel.

Further, since the stud material 15 is erected on the surface of the reinforcing beam 12 on the slab 31 side,
The degree of fixation between the reinforcing beam 12 and the solidifying material 40 is increased, and as a result, the bonding property between the reinforcing beam 12 and the slab 31 is further increased.

Since the horizontal force at the time of an earthquake is transmitted via the slab 31, the reinforcement frame 10 can be arrange | positioned, without being restrict | limited to the positional relationship with the structure of the existing building 30. FIG.
Since it is comprised so that the shear force at the time of an earthquake may mutually be transmitted between the reinforcement frame 10 and the existing building 30, a desired reinforcement effect is securable.

Since the reinforcing beams 12 are arranged in two stages on each floor, it is possible to reduce the size of the reinforcing beams 12, and as a result, it is possible to reduce the weight of the reinforcing frame 10.
Moreover, it can arrange | position so that the visual field from the inside of the existing building 30 may not be disturbed by adjusting the height of the reinforcement beam 12 arrange | positioned in two steps up and down in each floor.

In addition, while using an existing building, it is possible to install a reinforcing column that reduces the cross-sectional dimension and further reduces the amount of steel by integrating the horizontal member attached to the outer periphery of the existing building and the newly installed reinforcing beam. It becomes possible.
By integrating the reinforcing beam with the horizontal member, the cross section size of the reinforcing frame can be designed as a composite of the additional reinforcing beam and the horizontal member. Compared to the reinforced structure, it is possible to reduce the cross section of the reinforcing beam to be added, and to reduce the amount of reinforcing bars.

As mentioned above, although embodiment which concerns on this invention was described, this invention is not restricted to the said embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably.
For example, in the above-described embodiment, the case where the anchors are arranged in one row has been described, but the arrangement of the anchors is not limited, for example, the anchors are arranged in a staggered manner.

  Further, the horizontal member is not limited to the slab.

DESCRIPTION OF SYMBOLS 1 External reinforcement structure 10 Reinforcement frame 11 Reinforcement pillar 12 Reinforcement beam 14 Stud material 20 Anchor 30 Existing building 31 Slab (horizontal member)
40 Solidification material

Claims (2)

A horizontal member attached to the outer periphery of the existing building;
An external reinforcement structure of an existing building, comprising a reinforcing frame installed outside the outer periphery of the existing building,
The reinforcing frame includes a reinforcing column disposed through the horizontal member,
The extending in a direction perpendicular to the reinforcing pillars, in the first floor, it is constituted by reinforcing beams of two upper and lower stages respectively disposed along the lower surface of the upper surface and the upper floor of the horizontal member of the horizontal member,
The external reinforcing structure for an existing building, wherein the horizontal member and the reinforcing beam are joined to each other. An anchor implanted on the surface of the horizontal member on the side of the reinforcing beam;
A stud material erected on the horizontal member side surface of the reinforcing beam;
The horizontal member and the reinforcing beam are joined by a solidifying material that fills a space between the horizontal member and the reinforcing beam,
The external reinforcing structure for an existing building according to claim 1, wherein a stud is provided between the upper and lower reinforcing beams.

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