JP4917179B1 - Seismic maintenance method for existing buildings - Google Patents

Abstract

An earthquake-resistant maintenance method for an existing building that can maintain the building against horizontal forces from all directions due to an earthquake or the like.
SOLUTION: A ramen frame structure 1 in which a birdcage-like shape or a fence-like structure consisting of an upper frame structure 3 disposed on the ground and a lower frame structure 4 buried in the ground is integrated into an existing building 2 is provided. A seismic maintenance method constructed to surround the entire outer surface of the existing building 2 according to the scale and shape. The upper frame 3 is provided in close contact with the outer surface of the existing building 2 so as to firmly cover the existing building 2. After the lower frame 4 is inserted into a hole drilled in the ground, concrete or mortar is filled into the gap between the ground and the lower frame, and the lower frame 4 is fixed as a unit with the ground, thereby acting on the existing building 2. It is configured to bear a substantial portion of the horizontal force. The upper structure 3 is in intimate contact with the outer surface of the pillar and the outer surface of the large beam by close contact means disposed around the outer surface of the pillar and the main beam which are the structural parts of the existing building 2.
[Selection] Figure 1

Description

  The present invention relates to a seismic maintenance method for existing buildings.

  In Japan, which is an earthquake country, seismic performance is one of the important basic performances required for buildings as well as fire and fire resistance. In a newly built building, appropriate earthquake resistance can be imparted to the building by adjusting the number of pillars, the cross-sectional area, the amount of walls, the amount of reinforcing bars (in the case of RC structure or SRC structure), etc. at the design stage.

  On the other hand, methods for seismic reinforcement of existing buildings include adding seismic elements such as steel braces and bearing walls in existing buildings, increasing the wall thickness of bearing walls, increasing the cross-sectional area of columns and beams, There is a method to install a shelter in the building, but any of these methods requires large-scale construction in the building, and the residents in the building are removed in order to secure a construction material carry-in route and work space. As a matter of fact, it is impossible to carry out construction while using the building.

  Then, the method which can perform reinforcement construction in the state which can use a building is proposed (refer patent documents 1-2).

In the seismic reinforcement method described in Patent Document 1, a plane mechanism or a three-dimensional seismic mechanism independent from an existing building is constructed on a plane that does not interfere with the existing building, and the seismic mechanism is structurally connected to the existing building. To do. The newly built seismic mechanism and the existing building are connected to each other, and this connection part becomes a bypass that flows the horizontal force acting on the existing building to the seismic mechanism. As a result, the existing building and the seismic mechanism It is supposed to share power.
Further, Patent Document 2 discloses a seismic reinforcement structure for an existing building that does not damage the existing building so much and reduces restrictions on the lives of residents during construction. Construct wall pillars, construct large frames between these wall pillars to construct a reinforcing frame that surrounds the existing building, and place concrete frames, anchor bars or connecting bolts, etc. It is described that it is integrated with an existing building.

JP-A-9-203220 Japanese Patent Laid-Open No. 11-30044

However, in the method described in Patent Document 1, it is necessary to connect a newly built earthquake-resistant mechanism to a structural part of an existing building. For this connection work, considerable work is required although not as much as conventional. If the horizontal force is not distributed in a well-balanced manner, the earthquake resistance will be lost due to stress concentration, so careful selection and design of the connecting portion is required.
In addition, the horizontal force due to the earthquake should be assumed not only in one direction but also in all directions. In the seismic reinforcement structure described in Patent Document 2, the beam direction acted on the existing building by the wall pillar. Although the horizontal force is borne to some extent, the span direction cannot be borne by the wall pillar constructed integrally with the existing building or the concrete cast in the gap between the existing building and the wall pillar. Moreover, since the horizontal force is borne only at both ends of the building, an unexpected load may be applied to the building due to eccentricity or distortion due to loads from various directions such as earthquakes.

  The present invention has been made in view of such circumstances, hardly depends on the retained horizontal strength of the existing building, requires almost no work on the existing building, and is resistant to horizontal forces from all directions due to earthquakes and the like. The object is to provide a seismic maintenance method for existing buildings that can protect buildings.

The seismic maintenance method for an existing building according to the present invention (hereinafter also simply referred to as “seismic maintenance method”) is a bird cage or a fence comprising an upper frame disposed on the ground and a lower frame buried in the ground. A seismic maintenance method for constructing a ramen frame with the whole shape integrated so as to surround the entire outer surface of the existing building according to the scale and shape of the existing building,
The ramen frame is made of steel,
The upper frame is provided in close contact with the outer surface of the existing building so as to firmly cover the existing building,
The after inserting the lower rack assembly, filling a concrete or mortar in the gap between the ground and the lower rack assembly into a hole drilled to a predetermined depth in the ground in order to immobilize the ground by inserting the lower rack assembly By being fixed as one piece with the ground, it is configured to bear a considerable part of the horizontal force acting on the existing building ,
The upper rack structure is by contact means which is disposed structure in which columns and girders of the outer surface around the existing building, pressing directly on the outer surface of said post, it is closely and tightly directly to the outer surface of the girder ,and
It said contact means is characterized in Rukoto that have a steel bar or strip is closely on the peripheral surface of the pillar.

  In the seismic maintenance method of the present invention, the all-in-one frame structure constructed so as to surround the entire outer surface of the existing building in accordance with the scale and shape of the existing building is in close contact with the structure of the existing building, It is provided in close contact with or close to the outer surface of the existing building so that the upper frame of the all-in-one frame frame is firmly covered (consolidated). That is, the all-in-one frame frame and the existing building are not connected and fixed. Therefore, the seismic maintenance work can be performed in a state where the existing building is used, and the construction method is simple and easy, and the work can be completed in a short period of time. In addition, the earthquake-proof maintenance cost can be kept low. Further, the construction can be performed with little damage to the existing building, and the existing horizontal strength of the existing building is hardly relied on, so diagnosis of the existing horizontal strength of the existing building is unnecessary.

The upper frame of the all-in-one frame structure is installed so that the horizontal force acting on the existing building is transmitted in close or close contact with the outer surface of the existing building so that the existing building is solidified and covered. Part or all of the force can be transmitted to the upper frame. The horizontal force transmitted to the upper frame is also borne by the lower frame of the upper frame and the rigid frame embedded in the ground and fixed integrally with the ground. In this case, the lower frame can bear a considerable portion of the horizontal force acting on the existing building, that is, at least half.
Since the upper frame is provided as an all-in-one frame frame according to the scale and shape of the existing building, it can receive all horizontal forces acting on the existing building with a good balance. For this reason, horizontal force from all directions can be transmitted to the all-in-one frame structure at the same time, preventing deformation, collapse and damage of existing buildings, ensuring seismic maintenance. It can be carried out.

  Further, in the seismic maintenance method of the present invention, the upper structure is pressed and brought into close contact with the outer surface of the pillar by the contact means disposed around the outer surface of the pillar and the large beam which are the structural parts of the existing building. Have been close to. In this case, since the upper frame of the all-in-one frame structure is pressed and brought into close contact with the outer surface of the pillar of the existing building by the close contact means, the horizontal force acting on the existing building is more reliably applied to the upper surface of the existing building. It can be transmitted to the frame body and transmitted to the all-in-one frame frame structure composed of the upper frame body and the lower frame body, which can be borne.

  According to the seismic maintenance method of the present invention, the existing horizontal strength of the existing building is hardly relied on, almost no work is required on the existing building, and the building can be protected against horizontal forces from all directions due to earthquakes and the like. .

It is an isometric view explanatory drawing of 1st Embodiment of the earthquake-resistant maintenance method of this invention. It is plane explanatory drawing which shows arrangement | positioning with the pillar of the existing building in 1st Embodiment, and the vertical member of an upper frame. It is sectional explanatory drawing of the underground part in 1st Embodiment. It is a plane explanatory view of the upper frame in a 1st embodiment. It is front explanatory drawing of the upper frame and lower frame in 1st Embodiment. It is side surface explanatory drawing of the upper frame and lower frame in 1st Embodiment. It is perspective explanatory drawing of 2nd Embodiment of the earthquake-resistant maintenance method of this invention. It is sectional explanatory drawing of the underground part in 2nd Embodiment. It is perspective explanatory drawing of 3rd Embodiment of the earthquake-resistant maintenance method of this invention. It is sectional explanatory drawing of the underground part in 3rd Embodiment. (A) is a horizontal sectional view of an example of the close contact means, (b) is a vertical cross sectional view thereof, and (c) is a view showing a joining structure of an auxiliary member to a vertical member of the close contact means. (A) is a horizontal sectional view of another example of the contact means, and (b) is a vertical sectional view thereof. It is perspective explanatory drawing of 4th Embodiment of the earthquake-resistant maintenance method of this invention. It is plane explanatory drawing which shows arrangement | positioning with the pillar of the existing building and the vertical member of an upper frame in 4th Embodiment. It is a perspective explanatory view of a fifth embodiment of the seismic maintenance method of the present invention. It is plane explanatory drawing which shows arrangement | positioning with the pillar of the existing building and the vertical member of an upper frame in 5th Embodiment.

Hereinafter, embodiments of the earthquake-resistant maintenance method of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
FIG. 1 is a perspective explanatory view of the first embodiment of the seismic maintenance method of the present invention, and FIG. 2 is a plan view showing the arrangement of the columns of the existing building and the vertical members of the upper frame in the first embodiment. FIG. 3 is a cross-sectional explanatory view of the underground part in the first embodiment. 4 is an explanatory plan view of the upper frame in the first embodiment, and FIGS. 5 to 6 are an explanatory front view and an explanatory side view of the upper frame and the lower frame in the first embodiment, respectively. . That is, FIGS. 4 to 6 are mechanism diagrams showing that the upper frame structure and the lower frame structure of the fully integrated rigid frame structure according to the first embodiment of the present invention each bear a horizontal force acting on an existing building. It is.

  In the seismic maintenance method according to the present embodiment, a rigid frame body 1 made of a rolled steel material such as H-shaped steel or I-shaped steel, or a steel material such as a square steel pipe is disposed outside the existing building 2. The ramen frame 1 is composed of an upper frame 3 disposed on the ground and a lower frame 4 disposed on the ground, and has a birdcage shape or a fence shape integrated as a whole. Yes. As will be described later, the all-in-one frame structure 1 is in close contact with or close to the structure of the existing building 2 and is an independent structure that is completely separate from the existing building 2. In other words, in this embodiment, the solid (totally integrated ramen frame 1) and the solid (existing building 2) are in close contact with each other while remaining solid, and the structural iron is used as in the prior art. It is not intended to connect and fix the all-in-one frame structure and the existing building by welding the parts together or joining them with concrete or the like.

  The upper frame 3 is arranged in a substantially horizontal direction along the outer wall surface of the existing building 2 and the vertical member 3 a disposed in a substantially vertical direction along the outer wall surface of the existing building 2. It is comprised by the horizontal member 3b provided, and the top member 3c arrange | positioned along the roof surface of the existing building 2 in a substantially horizontal direction. On the other hand, the lower frame 4 is composed of a vertical member 4a disposed along a substantially vertical direction. In the rigid frame structure 1 according to the first embodiment, the vertical member 3a and the vertical member 4a are integrally continuous members, and the portion disposed on the ground becomes the vertical member 3a, and the portion disposed in the ground. Becomes the vertical member 4a. The vertical members 3a, the horizontal members 3b, and the top member 3c are processed into a predetermined length (including cutting) at the factory, and are carried to the site, and are rigidly connected to each other by plates, bolts, welding, and the like at the site. , Each constitutes an all-in-one ramen frame 1.

The vertical member 4a constituting the lower frame 4 is formed by drilling a predetermined position on the outer periphery of the existing building 2 to a predetermined depth with an appropriate drilling machine (a machine used when burying a power pole) such as a spiral auger. It is inserted into the hole. After insertion, the position and the verticality are confirmed, and the periphery of the vertical member 4a is filled with concrete 22 or mortar and hardened. Thereby, the lower frame 4 is fixed to the ground as a unit with the ground. The depth of the hole varies depending on the scale of the all-in-one type ramen frame 1 and the ground condition where the existing building 2 exists, but it is usually drilled up to a point where the ground strength is 10 to 15 t / m ² or more. Specifically, it is drilled to about 3 to 6 m.
In the first embodiment, since the foundation 15 of the existing building 2 does not extend outward from the wall surface, the vertical member 4a of the lower frame 4 does not interfere with the foundation 15 as shown in FIG. It is buried in. In FIG. 3, reference numeral 5 denotes a close contact means (see FIG. 11) described later.

  The vertical members 3 a and the horizontal members 3 b of the upper frame 3 are arranged so as to be in close contact with or close to the outer wall surface that is the outer surface of the existing building 2, and the top member 3 c of the upper frame 3 is It arrange | positions so that it may closely_contact | adhere to the roof surface which is an outer surface. As a result, as shown in FIGS. 4 to 6, the entire outer surface of the existing building 2 (in the case of a rectangular building, the front, back, both sides, and the top surface of the building) are matched to the scale and shape thereof, It is surrounded by the upper frame 3 of the all-in-one frame frame 1 so as to transmit the horizontal force acting on the existing building by being compacted and covered with a bird cage or a fence.

  Since the all-in-one frame frame 1 is not structurally connected to the structure of the existing building 2, no construction that greatly affects the existing building 2 is necessary, and the existing building 2 was used. It is possible to perform earthquake-resistant maintenance work in the state. In addition, the construction can be performed with little damage to the existing building 2.

  As shown in FIGS. 1 and 2, the upper frame 3 of the all-in-one frame frame 1 is closely or closely attached to the outer surface of the existing building 2 so as to cover the existing building 2 with a bird cage or a fence. Therefore, part or all of the horizontal force acting on the existing building 2 can be transmitted to the upper frame 3. The horizontal force transmitted to the upper frame 3 is also borne by the lower frame 4 of the rigid frame frame 1 embedded and fixed in the ground as described above. In the present embodiment, the upper frame 3 is provided as a fully integrated ramen frame in accordance with the scale and shape of the existing building 2, so that it can receive the total horizontal force acting on the existing building 2 with a good balance. it can. For this reason, the horizontal force can be transmitted to the all-in-one type ramen frame 1 simultaneously with respect to the horizontal force from any direction due to an earthquake, etc., and the deformation, collapse and damage of the existing building 2 can be prevented. Seismic maintenance can be performed reliably.

  In this embodiment, the vertical member 3a of the upper frame 3 is pressed against the outer surface of the pillar 7 which is the structure of the existing building 2 by the contact means 5, and is configured integrally with the vertical member 3a. The cross member 3b of the upper frame 3 is in close contact with the outer surface of the large beam 20 that is the structure of the existing building 2. As shown in FIG. 11, the contact means 5 has a steel bar 6 processed into a U-shape (including on-site processing), and this steel bar 6 is used for the column 7 of the existing building 2. The size is set so as to be close to the peripheral surface. Both ends of the steel bar 6 are threaded, and a nut 9 is screwed into a threaded portion (male threaded portion) 6a that protrudes outside through the holes of the auxiliary steel materials 8a and 8b. The vertical member 3 a can be pressed against the outer surface of the pillar 7 that is the outer surface of the existing building 2. As shown in FIG. 11 (c), the end portion of the auxiliary steel member 8a and the end portion of the auxiliary steel member 8b are fixed to the side portion of the vertical member 3a by full circumference welding. The hole 10 a formed in the wall 10 for passing the steel bar 6 is waterproof caulked with an appropriate seal member 11 after the auxiliary steel members 8 a and 8 b are tightened with the nut 9. A steel strip can be used instead of the steel bar 6.

  The upper frame 3 of the all-in-one frame structure 1 is pressed and brought into close contact with the outer surface of the pillar 7 in the structural part of the existing building 2 by the contact means 5 having the steel bar 6, and is brought into close contact with the outer surface of the girder 20. The horizontal force acting on the existing building 2 can be more reliably transmitted to the upper frame 3.

FIG. 12 shows another example of the contact means 5. In this example, a steel strip 12 is used instead of the steel bar 6. Further, the steel strip 12 is directly engaged with the vertical member 3 a of the upper frame 3 without using the auxiliary steel member 8. The steel strip 12 is fastened to the column 7 by bolts 13 and nuts 14. In the close contact means 5 shown in FIG. 12, for example, a steel strip 12 processed into a U-shape (both holes for inserting bolts 13 are formed at both ends) is inserted into the hole 10a from the indoor side and protrudes from the hole 10a. The vertical part 3a can be pressed against the column 7 by bending the part that has been made on-site, then attaching bolts 13 and nuts 14 and tightening.
In the example shown in FIG. 12, an elastic member 21 such as a rubber plate is attached in advance to the side surface of the steel strip 12 that comes into contact with the surface of the column 7 with an adhesive. Therefore, when the band steel 12 is disposed at a predetermined position of the column 7 and the nut 14 is tightened, the degree of adhesion of the band steel 12 to the surface of the column 7 can be increased.

[Second Embodiment]
FIG. 7 is a perspective explanatory view of a second embodiment of the seismic maintenance method of the present invention, and FIG. 8 is a sectional explanatory view of an underground part in the second embodiment. The arrangement of the columns and the vertical members is the same as that in the first embodiment shown in FIG.

In the first embodiment shown in FIGS. 1 to 6, since the foundation 15 of the existing building 2 does not extend outward from the wall surface, the vertical member 4 a of the lower frame body 4 is underground without interfering with the foundation 15. In the second embodiment, the foundation 15 of the existing building 2 extends outward from the wall surface. Therefore, in the second embodiment, since the thickness of the foundation 15 extending outward from the wall surface is relatively thin, the vertical member 4a is embedded in the ground while penetrating the foundation 15.
Also in the second embodiment, the vertical member 3a of the upper frame 3 is pressed or brought into close contact with the outer surface of the existing building 2 by the contact means shown in FIG.

[Third Embodiment]
FIG. 9 is a perspective explanatory view of a third embodiment of the seismic maintenance method of the present invention, and FIG. 10 is a cross-sectional explanatory view of an underground portion in the third embodiment. The arrangement of the columns and the vertical members is the same as that in the first embodiment shown in FIG.

In the third embodiment, as in the second embodiment, the foundation 15 of the existing building 2 extends outward from the wall surface, but unlike the second embodiment, the vertical member 4a of the lower frame 4 is It is buried in the ground avoiding the foundation 15. Specifically, the vertical member 4a of the lower frame 4 is bent outward in the vicinity of the upper surface of the foundation portion 15a extending outward from the wall surface of the existing building 2, and further extended outward from the foundation portion 15a. Is bent downward. In the present embodiment, the vertical members 3a of the upper frame 3 and the vertical members 4a of the lower frame 4 do not exist on the same axis, so that the horizontal force received by the upper frame 3 is effectively transmitted to the ground. As shown, the auxiliary vertical member 4a1 as the lower frame 4 of the all-in-one type rigid frame frame 1 is rigidly attached to the lowermost horizontal member 3b at an intermediate position between the foundation 15 and the foundation 15 where the foundation 15 does not exist. It is installed in contact. By using the auxiliary vertical member 4a1 together with the vertical member 4a, the horizontal force received by the upper frame 3 can be effectively transmitted to the ground.
Also in the third embodiment, the vertical member 3a of the upper frame 3 is pressed or brought into close contact with the outer surface of the existing building 2 by the contact means shown in FIG.

[Fourth Embodiment]
FIG. 13 is a perspective explanatory view of the fourth embodiment of the seismic maintenance method of the present invention, and FIG. 14 is a plan view showing the arrangement of the columns of the existing building and the vertical members of the upper frame in the fourth embodiment. FIG. This fourth embodiment assumes a relatively small-scale building (a wooden structure or a light-weight steel structure), and the top 3c of the upper frame 3 of the all-in-one frame frame 1 is the eave 16 of the existing building 2. It penetrates.
Also in the fourth embodiment, the vertical members 3a of the upper frame 3 are pressed or brought into close contact with the outer surface of the existing building 2 by the contact means shown in FIG.

[Fifth Embodiment]
FIG. 15 is a perspective explanatory view of the fifth embodiment of the seismic maintenance method of the present invention, and FIG. 16 is a plan view showing the arrangement of the columns of the existing building and the vertical members of the upper frame in the fifth embodiment. FIG. This fifth embodiment assumes a relatively small wooden single-family house as in the fourth embodiment, but considering the appearance of the building, the top member of the upper frame 3 in the fourth embodiment. 3c is omitted. Also, if a two-story house of wooden floor area 120 m ³ before and after, it is possible to secure a sufficient seismic protection alone crosspieces 3b which four longitudinal members 3a and that of which is To integrally The central vertical member 3a is also omitted.
Also in the fifth embodiment, the vertical member 3a of the upper frame 3 is pressed or brought into close contact with the outer surface of the existing building 2 by the contact means shown in FIG.

  Also in the second to fifth embodiments, the upper frame 3 of the all-in-one type ramen frame 1 is configured to transmit the horizontal force acting on the existing building by covering the existing building 2 with a bird cage or a fence. Since it is provided in close contact or close contact with the outer surface of 2, part or all of the horizontal force acting on the existing building 2 can be transmitted to the upper frame 3. The total horizontal force transmitted to the upper frame 3 is also borne by the lower frame 4 of the rigid frame frame 1 embedded and fixed in the ground. In addition, since the upper frame 3 is provided as a fully integrated ramen frame in accordance with the shape of the existing building 2, it can receive the total horizontal force acting on the existing building 2 with a good balance. For this reason, the horizontal force can be transmitted to the all-in-one type ramen frame 1 simultaneously with respect to the horizontal force from any direction due to an earthquake, etc., and the deformation, collapse and damage of the existing building 2 can be prevented. Seismic maintenance can be performed reliably.

In addition, the earthquake-resistant maintenance method of this invention is not limited to embodiment mentioned above, A various change is possible. For example, in the embodiment described above, a two-story or three-story building is targeted, but the seismic maintenance method of the present invention can be applied to a four-story or more building.
In the embodiment described above, the building having a rectangular plane is targeted. However, the seismic maintenance method of the present invention can also be applied to buildings having other planar shapes such as a square and an L shape.

  In the above-described embodiment, the upper frame and the lower frame are configured by a single member such as H-shaped steel or I-shaped steel. However, a composite member may be used. Here, the “composite member” is a combination of two or more types of single members. For example, two C-shaped steel openings are integrated with each other by welding, or an H-shaped steel opening is flat. The thing which welded steel etc. can be mentioned.

Further, the arrangement of the vertical members and cross members of the upper frame can be changed as appropriate.
Moreover, although the size (cross-sectional dimension) of a vertical member and a horizontal member can also be changed by arrangement | positioning location, if a size is shared, a number of parts can be reduced and cost reduction can be aimed at. In addition, in the case of a small-scale building such as a wooden structure, the cross member 3b can be additionally disposed through the ceiling behind the existing building. Moreover, the upper frames of the opposite surfaces such as the front and back of the existing building can be connected to each other with a steel bar or steel wire through the back of the ceiling or under the floor, and can be fastened with a turnbuckle. In this case, the iron bar or the steel wire and the turnbuckle for fastening the same function as the close contact means in the present invention.

  In the above-described embodiment, there are no elements projecting outward from the outer surface of the building, such as fences, verandas, and parapets, but the seismic maintenance method of the present invention can be applied even when these elements exist. For example, when a fence or a veranda is present on the outer wall of a building, the vertical member of the upper frame is disposed through the fence. And the waterproof coking process is given to the part which a vertical member penetrates with a sealing material. When the parapet is present on the roof of the building, the top frame of the upper frame is disposed through the parapet. And the part which a top material penetrates is given a waterproof coking process with a sealing material. In the case of a wooden tile roof or the like, it is not necessary to bring the top frame of the upper frame into close contact with the tile or the like.

  In the above-described embodiment, the upper frame is directly brought into contact with the pillar or the large beam that is the structural part of the existing building, but there is a gap between the structural part of the existing building and the upper frame. In such a case, an elastic member such as a rubber sheet can be sandwiched between the structural part of the existing building and the upper frame. In this case, the degree of adhesion between the structural part of the existing building and the upper frame can be increased. The size and location of the elastic member can be appropriately selected according to the shape and scale of the existing building.

DESCRIPTION OF SYMBOLS 1 Fully integrated ramen frame 2 Existing building 3 Upper frame 3a Vertical member 3b Horizontal member 3c Top member 4 Lower frame 4a Vertical member 4a1 Auxiliary member 5 Adhering means 6 Bar steel 7 Column 8a Auxiliary steel member 8b Auxiliary steel member 9 Nut 11 Seal material 12 Strip steel 13 Bolt 14 Nut 15 Foundation 16 Eaves 20 Large beam 21 Elastic member 22 Concrete

Claims (1)

A ramen frame consisting of a birdcage-like or fence-like structure consisting of an upper frame placed on the ground and a lower frame buried underground is combined with the existing building's scale and shape. A seismic maintenance method constructed to surround the entire exterior of a building,
The ramen frame is made of steel,
The upper frame is provided in close contact with the outer surface of the existing building so as to firmly cover the existing building,
The after inserting the lower rack assembly, filling a concrete or mortar in the gap between the ground and the lower rack assembly into a hole drilled to a predetermined depth in the ground in order to immobilize the ground by inserting the lower rack assembly By being fixed as one piece with the ground, it is configured to bear a considerable part of the horizontal force acting on the existing building ,
The upper rack structure is by contact means which is disposed structure in which columns and girders of the outer surface around the existing building, pressing directly on the outer surface of said post, it is closely and tightly directly to the outer surface of the girder ,and
It said contact means is characterized Rukoto that have a steel bar or strip is closely on the peripheral surface of said post, seismic protection methods existing buildings.

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