JP4855795B2 - Seismic reinforcement structure for existing structures - Google Patents

Description

  The present invention relates to a seismic reinforcement structure that seismically reinforces an existing structure by a seismic structure provided outside the existing structure.

  In order to seismically reinforce existing buildings, methods such as providing steel braces and bearing walls in existing buildings, increasing the thickness of the bearing walls, columns, and beams are generally used.

  However, since it is a reinforcement work in the existing building, the living space is narrowed by the reinforcing member, and it is difficult for the resident to carry out the work while living in the building.

  In addition, as shown in FIG. 8, in the existing building 204 based on the support piles 201, 202, and 203 provided in the ground 200, a horizontal force F due to an earthquake or the like is directed in a direction from the left side to the right side of the existing building 204. When it acts, the entire existing building 204 receives a clockwise moment that tilts to the right, so that a pulling force P is generated in the support pile 201 located immediately below the left end of the existing building 204, and the right end of the existing building 204 is A pushing force T is generated in the support pile 203 located immediately below the part.

  In particular, support piles of old buildings often cannot bear this pulling force P, and many support piles must be newly constructed as the foundation of the existing building 204. Further, if the existing building 204 is seismically reinforced and the entire existing building 204 is strengthened, the existing building 204 does not absorb the horizontal force F caused by an earthquake or the like. It may be necessary to install new support piles.

  In the earthquake-proof reinforcement structure of Patent Document 1, as shown in FIG. 9, two existing structures 206 and 208 are adjacent to each other, and the adjacent outer pillars of the existing structures 206 and 208 are connected to each other by connecting members 210 on each floor. ing.

When a horizontal force F due to an earthquake or the like acts in the direction from the left side to the right side of the existing structure 206, it is provided directly below the outer pillar located at the left end of the existing structures 206 and 208 on the same principle as in FIG. Pull-out forces P ₁ and P ₂ are generated in the piles 212 and 214, respectively, and the push-in forces are applied to the piles 216 and 218 provided immediately below the outer pillars located at the right ends of the existing structures 206 and 208, respectively. T ₁ and T ₂ are generated.

At this time pushing force T ₁ and the pull-out force P ₂ is mutually subtraction can these forces is reduced, to avoid pulling out of the pile 214.

  However, since patent document 1 is a reinforcement structure which connects the adjacent existing structures, it cannot apply to the existing structure in which the adjacent existing structure does not exist.

  In the seismic reinforcement method of Patent Document 2, as shown in FIG. 10, a three-dimensional frame 222 serving as an earthquake-resistant frame is constructed so as to be parallel to the outer peripheral surfaces of both sides of an existing building 220 built on the ground 200. The three-dimensional frame 222 is connected to each floor of the existing building 220 or an arbitrary floor.

  Therefore, since the three-dimensional frame 222 also shares the horizontal force acting on the existing building 220 due to an earthquake or the like, stress concentration on the frame of the existing building 220 is avoided, so that the existing building 220 is not subjected to seismic reinforcement. It's okay.

However, when the ground 200 that supports the three-dimensional frame 222 is bad, a pile foundation for the three-dimensional frame 222 must be constructed, and a construction cost for that is required.
JP 2002-13296 A JP-A-9-203220

  In consideration of such facts, the present invention does not perform a reinforcement work inside the existing structure and a new support pile for supporting the existing structure by the earthquake-resistant structure provided outside the existing structure, and further, the bad ground However, it is an object of the present invention to provide a seismic reinforcement structure capable of seismic reinforcement of an existing structure without newly installing a large-sized support pile or a large number of support piles for the earthquake-resistant structure.

The invention of the first aspect is a pair of seismic structures that are constructed on both sides of an existing structure on a foundation different from the foundation of the existing structure, and the lower layer part protrudes away from the existing structure rather than the upper layer part And a connecting portion that connects the seismic structure and the existing structure.

In the first aspect of the invention, a pair of earthquake-resistant structures are constructed on both sides of the existing structure. And this pair of earthquake-resistant structure is built on the foundation different from the foundation of the existing structure. Moreover, the seismic structure and the existing structure are connected by a connecting portion.

  For this reason, when a horizontal force due to an earthquake or the like acts on an existing structure in a direction from one of the pair of earthquake resistant structures (hereinafter referred to as earthquake resistant structure A) to the other (hereinafter referred to as earthquake resistant structure B). Since the entire existing structure receives a rotational moment inclined in the direction of the horizontal force, a vertical pull-out force is generated at the end of the existing structure on the seismic structure A side, and the existing structure's seismic structure B A vertical pushing force is generated at the end on the side.

  Similarly, the pushing force is applied to the end of the seismic structure A on the existing structure side and the end of the seismic structure B lower layer away from the existing structure on the lower side of the seismic structure B. A pulling force is generated at the end of the seismic structure B at the end of the seismic structure B.

  At this time, since the seismic structure and the existing structure are connected by the connecting portion, the pulling force generated at the end of the existing structure on the seismic structure A side and the seismic structure A on the existing structure side Since the pushing force generated at the end portion is transmitted through the connecting portion and pulled away, these forces can be reduced.

  In addition, the pushing force generated at the end of the existing structure on the seismic structure B side and the pulling force generated at the end of the existing structure on the seismic structure B are also pulled away to reduce these forces. be able to.

  Therefore, the existing structure can be seismically reinforced without reinforcing work inside the existing structure and without newly installing a support pile for supporting the existing structure.

  In addition, even when the ground supporting the seismic structure is weak, the pulling or pushing force generated at the end of the existing structure side of the seismic structure is reduced, so it can be used directly as a foundation. There is no need to install a new support pile directly under the end of the existing structure.

  A support pile for the existing structure has already been constructed near the end of the existing structure side of the earthquake-resistant structure. The workability is also poor.

  Therefore, since it is not necessary to newly install a support pile immediately below the end of the seismic structure on the existing structure side, it is possible to shorten the work period and reduce costs compared to the conventional case.

  Moreover, each lower layer of a pair of earthquake-resistant structure has protruded in the direction away from an existing structure rather than an upper layer.

  Therefore, the pulling-out force or pushing-in force generated at the end of the seismic structure lower layer away from the existing structure of the seismic structure lower layer is reduced by increasing the protruding length of the seismic structure lower layer. Therefore, even if the ground supporting the seismic structure is bad, there is no need to install a large support pile or a large number of support piles directly below the end of the seismic structure under the existing structure. Good.

The invention of the second aspect is characterized in that at least one of the earthquake-resistant structures is a three-dimensional frame.

In the invention of the second aspect , since at least one of the earthquake resistant structures is a three-dimensional frame, it is possible to construct an earthquake resistant structure having a structurally sufficient strength.

The invention of the third aspect is characterized in that at least one of the earthquake-resistant structures is provided with a floor.

In the invention of the third aspect , since the floor is provided on at least one of the earthquake-resistant structures, the floor height in the existing structure is increased by providing the equipment and equipment piping of the existing structure on the floor. It can be kept low. For this reason, the indoor part of the existing structure can be made into a wide living space with a high ceiling.

The invention of the fourth aspect is characterized in that the seismic structure is connected by the connecting portion on each floor of the existing structure.

In the fourth aspect of the invention, since the seismic structure is connected to each floor of the existing structure by the connecting portion, the pulling-out force or the pushing force generated at the adjacent ends of the seismic structure and the existing structure is connected. It is more reliably transmitted via the part.

  Since the present invention has the above-described configuration, it does not reinforce the existing structure and does not newly install a support pile for supporting the existing structure, and also has a large cross-section support pile for an earthquake-resistant structure even in bad ground. And existing structures can be seismically strengthened without installing a large number of support piles.

  The earthquake-proof reinforcement structure of the existing structure which concerns on embodiment of this invention is demonstrated referring drawings. In this embodiment, an example of an RC apartment house will be described, but it can be applied to any building. 1 and 2 show a seismic reinforcement structure 10 for an existing structure of the present embodiment.

  An RC apartment house 20 is built as an existing structure supported by PHC piles 14, 16, 18 provided in the ground 12.

  On both the left and right sides of the apartment house 20, three-dimensional frames 22 and 24 are installed as seismic structures built on foundation parts 30 and 36 different from the foundation of the apartment house 20. The three-dimensional frames 22, 24 are composed of columns, beams, and braces as reinforcing members.

  A PHC pile 28 is provided directly below the column 26 located at the end of the lower level of the multi-story frame 22 away from the housing complex 20 and supports the three-dimensional frame 22, but the base part on which the PHC pile 28 is not provided. 30 is directly the basis.

  In addition, a PHC pile 34 is provided directly below the column 32 located at the end of the three-dimensional frame 24 on the side away from the apartment house 20, and supports the three-dimensional frame 24, but this PHC pile 34 is not provided. The foundation part 36 is directly the foundation. In both of the three-dimensional frames 22 and 24, the lower layer portion projects outside the upper layer portion in the direction away from the apartment house 20.

  In addition, the three-dimensional frames 22 and 24 are connected by a connecting member 38 on the fourth to seventh floors and the roof of the apartment house 20.

  Here, the connecting member 38 that connects the outer column 40 located at the end of the three-dimensional frame 22 on the apartment 20 side and the outer column 42 positioned at the end of the three-dimensional frame 22 of the apartment 20 will be described. As shown in the plan view of FIG. 3 and the side view of FIG. The bearing plate 44 is fixed and projects in a cantilevered manner on the outer column 40 side.

  Fixing holes 50 and 52 through which the threaded through anchor 48 passes are formed in the housing wall 46 of the apartment house 20 and the side surface 44A of the bearing plate 44 facing the housing wall 46, and are formed at both ends of the threaded through anchor 48. The bearing plate 44 is fixed to the outer column 42 by screwing the nut 54 into the male screw.

  Further, an adhesive anchor 56 is inserted and bonded into the outer column 42 so as to be orthogonal to the threading anchor 48. Then, in a state where the threaded anchor 48 and the adhesive anchor 56 are in contact with each other, a gap surrounded by a U-shape by the housing wall 46, the outer column 42, and the side surface 44A of the bearing plate 44 so as to cover these anchors. Is filled with grout mortar 58.

  Further, a support plate 60 made of a substantially trapezoidal iron plate in plan view and reinforced by ribs 61 is fixed to the outer column 40 and projects out in a cantilever manner on the outer column 42 side.

  Then, six bolts 62 and nuts 64 are connected in a state where the bottom surface 60A of the end portion of the bearing plate 60 is superimposed on the upper surface 44B of the end portion of the bearing plate 44 that projects. Further, the outer pillar 66 located at the end of the three-dimensional frame 24 on the apartment house 20 side and the outer pillar 68 located at the end of the apartment house 20 on the three-dimensional frame 24 side are also connected in the same manner.

  Accordingly, the pulling force and pushing force generated in the outer column 40 are transmitted to the outer column 42 in the order of the outer column 40, the bearing plate 60, the bearing plate 44, the threading anchor 48, the adhesive anchor 56, and the outer column 42. The pulling force and pushing force are transmitted in the reverse order.

  In addition, a floor 70 is formed on a part of the first to third floors of the three-dimensional frames 22 and 24, and on this, equipment equipment 72, equipment piping 74 of the apartment house 20, and a solar panel 76 of the solar power generation system. Is provided.

  Next, the operation and effect of the seismic reinforcement structure for an existing structure according to the embodiment of the present invention will be described.

As shown in FIG. 1, when a horizontal force F due to an earthquake or the like acts on the apartment house 20 in the direction from the three-dimensional frame 22 to the three-dimensional frame 24, the entire apartment house 20 receives a rotational moment that tilts toward the three-dimensional frame 24 side. , the outer column 68 is vertical pulling force P ₃ generated in the outer columns 42, located at the end of the three-dimensional Frames 24 side of the apartment house 20 located at the end of the three-dimensional Frames 22 side of the apartment 20 the vertical pushing force T ₃ occurs.

Similarly, the pressing force T ₄ , T ₅ is applied to the outer column 40 at the end of the three-dimensional frame 22 on the side of the apartment house 20 and the outer column 32 at the end of the three-dimensional frame 24 on the side far from the apartment house 20. However, pulling forces P ₅ and P ₄ are generated in the outer column 66 at the end of the three-dimensional frame 24 on the side of the apartment 20 and the outer column 26 at the end of the three-dimensional frame 22 on the side far from the apartment 20.

Since this time the solid Frames 22 and 24 Housing 20 are connected by the connecting member 38, the pulling force P ₃ generated outside column 42 collective housing 20, pushing that occurs outside pillars 40 of the three-dimensional Frames 22 since the force T ₄ mutually subtraction and transmitted via the connecting member 38, it is possible to reduce these forces.

Further, the pushing force T ₃ generated in the outer column 68 of the apartment 20 and the pulling force P ₅ generated in the outer column 66 of the three-dimensional frame 24 are similarly pulled away, and these forces can be reduced.

  Therefore, the seismic reinforcement of the apartment house 20 can be performed without performing the reinforcement work inside the apartment house 20 and the new installation of a support pile for supporting the apartment house 20.

  Further, even when the ground supporting the three-dimensional frames 22, 24 is weak, the pushing force or the pulling force generated in the outer pillars 40, 66 of the three-dimensional frames 22, 24 is reduced, so that it can be directly used as a foundation. It is not necessary to newly install a support pile immediately below the outer columns 40 and 66 of the three-dimensional frames 22 and 24.

  Since the supporting piles of the housing complex 20 have already been constructed near the outer columns 40 and 66 of the three-dimensional frames 22 and 24, the new installation of the supporting piles of the three-dimensional frames 22 and 24 in this vicinity is It is restricted and the workability is also deteriorated.

  Therefore, since it is not necessary to newly install a support pile directly under the outer pillars 40 and 66 of the three-dimensional frames 22 and 24, it is possible to shorten the work period and reduce costs compared to the conventional case.

  In addition, the first floor portion of the three-dimensional frame 22 and the first and second floor portions of the three-dimensional frame 24 protrude in a direction away from the apartment house 20 than the other floors.

  Therefore, by increasing the protruding length, the pulling force or pushing force generated in the outer columns 26 and 32 of the three-dimensional frames 22 and 24 is reduced. Therefore, even when the ground supporting the three-dimensional frames 22 and 24 is bad, it is not necessary to newly install a large-sized support pile or a large number of support piles immediately below the outer columns 26 and 32 of the three-dimensional frames 22 and 24.

  In addition, since the three-dimensional frames 22 and 24 are composed of columns, beams, and braces, it is possible to construct an earthquake-resistant structure having sufficient structural strength, and to prevent sunlight S from being collected into the apartment house 20. The three-dimensional frames 22 and 24 can be built.

  Moreover, the floor height in the collective housing 20 can be kept low by providing the equipment 72 and equipment piping 74 of the collective housing 20 on the floor 70 provided in the three-dimensional frame 22, 24. For this reason, the indoor part of the apartment house 20 can be made into a wide living space with a high ceiling. Further, by providing the solar panel 76, it is possible to save energy for the equipment 72 and the like.

  5 to 7 show modifications of the present embodiment shown in FIGS.

  The seismic reinforcement structure 78 of FIG. 5 is an example in which a pair of three-dimensional frames 80 and 82 are constructed at a substantially central portion in the long side direction in a plan view of the apartment house 20.

  6 is an example in which three-dimensional frames 86, 88, 90, and 92 are constructed in the vicinity of the four corners of the apartment house 20 in a plan view.

  7 is an example in which a pair of three-dimensional frames 96 and 98 having a height lower than that of the apartment house 20 are constructed.

  5-7 can obtain the same operation and effect as in FIGS.

  In this embodiment, the support piles 14, 16, 18, 28, 34 are PHC piles, but any pile that can support a structure may be used, such as a cast-in-place concrete pile, a precast concrete pile, a steel pipe pile, or the like. it can.

  Moreover, although the earthquake-resistant structure is a three-dimensional frame composed of columns, beams, and braces, it may be a structure having an earthquake-resistant strength, may have a wall, and is a normal one where people live. It may be an architectural building.

  Moreover, although the floor part 70 was provided in a part of 1-3 floors of the three-dimensional frame 22, 24, it should just be provided suitably as needed and the floor part 70 does not need to be.

  Moreover, although the example in which the three-dimensional frames 22 and 24 are connected by the connecting member 38 on the fourth floor to the seventh floor of the apartment house 20 and the roof has been shown, the connecting floor may be appropriately determined as necessary. If all the floors are connected, the pulling-out force or pushing-in force generated in the adjacent outer pillars of the housing complex 20 and the three-dimensional frames 22 and 24 can be more reliably transmitted via the connecting member 38. Further, the connection method is not limited to the method of the connection member 38, and any method can be used as long as it can transmit the axial force of the outer column.

  In addition, the example in which the first floor of the three-dimensional frame 22 and the first and second floors of the three-dimensional frame 24 are projected outwards is shown. Can do. Further, the overhanging length may be appropriately determined according to the location conditions of the three-dimensional frames 22 and 24. The longer the projecting, the fewer the number of PHC piles 28 and 34, and the smaller the cross section of the pile.

  In addition, with respect to the pushing force generated in the PHC piles 14 and 18 of the apartment house 20, the pile foundation of the apartment house 20 can be considered as a piled raft foundation, so that it is safer by applying this embodiment. It becomes a pile foundation.

It is explanatory drawing which shows the earthquake-proof reinforcement structure of the existing structure which concerns on embodiment of this invention. It is a perspective view which shows the seismic reinforcement structure of the existing structure which concerns on embodiment of this invention. It is a top view which shows the connection part which concerns on embodiment of this invention. It is a side view which shows the connection part which concerns on embodiment of this invention. It is a perspective view which shows the modification of the seismic reinforcement structure of the existing structure which concerns on embodiment of this invention. It is a perspective view which shows the modification of the seismic reinforcement structure of the existing structure which concerns on embodiment of this invention. It is a perspective view which shows the modification of the seismic reinforcement structure of the existing structure which concerns on embodiment of this invention. It is explanatory drawing which shows the force which acts on the conventional existing structure. It is the schematic which shows the seismic reinforcement structure of the conventional existing structure. It is the schematic which shows the seismic reinforcement method of the conventional existing building.

Explanation of symbols

10 Seismic reinforcement structure 20 Apartment house (existing structure)
22 Three-dimensional frame (seismic structure)
24 Three-dimensional frame (seismic structure)
38 Connecting member (connecting part)
70 Floor (floor)
78 Seismic reinforcement structure 80 Three-dimensional frame (seismic structure)
82 Three-dimensional frame (seismic structure)
84 Seismic reinforcement structure 86 Three-dimensional frame (seismic structure)
88 Three-dimensional frame (seismic structure)
90 Three-dimensional frame (seismic structure)
92 Three-dimensional frame (seismic structure)
94 Seismic reinforcement structure 96 Three-dimensional frame (seismic structure)
98 Three-dimensional frame (seismic structure)

Claims (4)

A pair of seismic structures that are constructed on both sides of the existing structure on a foundation different from the foundation of the existing structure, and in which the lower layer part protrudes away from the existing structure rather than the upper layer part,
A connecting portion connecting the seismic structure and the existing structure;
Have
The end of the foundation away from the existing structure in the foundation on which the seismic structure is constructed is supported by a pile, and other than the end in the foundation on which the earthquake resistant structure is constructed is a direct foundation. Seismic reinforcement structure for existing structures.   The seismic reinforcement structure for an existing structure according to claim 1, wherein at least one of the seismic structures is a three-dimensional frame.   The floor structure is provided in at least one of the said earthquake-resistant structure, The earthquake-proof reinforcement structure of the existing structure of Claim 1 or Claim 2 characterized by the above-mentioned.   The said earthquake-resistant structure is connected with the said connection part in each floor of the said existing structure, The earthquake-proof reinforcement structure of the existing structure of any one of Claims 1-3 characterized by the above-mentioned.

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