Seismic reinforcement structure coated with polyurea resin, and method for constructing the same.

Abstract

To provide a seismic reinforcement structure that can easily and simply improve the seismic performance of a building while ensuring stable and high quality. [Solution] The reinforcing structure 10A includes at least one reinforcing structural member 10A-1, and at least a portion of the reinforcing structure 10A is configured to be detachably disposed in a space formed between at least two existing structural members 1010 and 1030 of a building. The portion includes at least two contact portions 13-1010 and 13-1030 that contact the structural members 1010 and 1030 that have been deformed by an external force. The reinforcing structural member 10A-1 is partially or entirely covered with polyurea resin, including at least the contact portions 13-1010 and 13-1030.

Description

Technical Field

[0001] The present invention relates to a technology for minimizing damage caused by disasters, and in particular, to a seismic retrofitting structure for minimizing earthquake damage by enhancing the seismic performance of existing buildings, and a construction method thereof.

Background Art

[0002] In recent years, large-scale earthquakes including the Great East Japan Earthquake, the Kumamoto Earthquake, and the Noto Peninsula Earthquake have occurred frequently across various parts of Japan, causing severe damage such as the collapse of buildings due to these earthquakes. To minimize the damage from such disasters as much as possible, enhancing the seismic performance of buildings is useful. Here, for newly constructed buildings, high seismic performance can be achieved relatively easily by setting the number and arrangement of structural bodies such as columns and beams to a desired form through structural calculation.

[0003] In contrast, for existing buildings, since the number and arrangement of structural bodies have already been determined, it is currently difficult to achieve desired seismic performance by modifying these configurations. For this reason, as a technology for enhancing the seismic performance of existing buildings, for example, Patent Document 1 proposes adding a reinforcing structure to an existing structural body.

[0004] Additionally, to minimize disaster damage, technologies that allow simple assembly of shelters for protecting lives in emergencies have attracted attention. For example, Patent Document 2 proposes a lightweight house that can be easily assembled in an emergency and can also be used as a shelter.

[0005] The seismic reinforcement structure disclosed in Patent Document 1 is characterized by interposing a resin panel (100) between a pair of existing vertical members (20, 20) and filling the groove-like gaps formed between these members with a foamed resin material (90, 200) made of injected or sprayed foamed resin material to a thickness of 30 mm or more. As a result, the pair of existing vertical members (20, 20) are bonded to the resin panel (100) via the foamed resin material (90, 200) to a thickness of 30 mm or more, thereby becoming integrated and seismically reinforced.

[0006] Furthermore, the lightweight house disclosed in Patent Document 2 is characterized in that the floor structure, wall structure, and roof structure are all made of expanded polystyrene boards, and the surfaces of these boards are coated with polyurea resin. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2024-134570 [Patent Document 2] Utility Model Registration No. 3238955 [Overview of the project] [Problems that the invention aims to solve]

[0008] The conventional seismic reinforcement structure disclosed in Patent Document 1, as described above, requires the filling of a foamed resin material with a thickness of 30 mm or more between the existing structure and the resin panel, and this filling work must be performed on-site. In this case, in order to maintain high quality, it is necessary to apply a uniform amount of foamed resin material, which presents a problem in that the work must be carried out by craftsmen with the required skills. In other words, since the quality depends on the skill of the person doing the work, there is a problem in that it is difficult to manage in order to maintain it stably.

[0009] Furthermore, the filling process itself is not simple, as it must be carried out at a constant speed in a work environment that forces workers into awkward positions. In addition, since the foamed resin material to be filled will be used to fill groove-like gaps that conform to the shape of the existing structure, the reinforcement method will also be limited to the shape of those gaps, resulting in a lack of flexibility in the construction method.

[0010] Furthermore, while the lightweight house usable as a shelter disclosed in Patent Document 2 can be installed on the roof of an existing building, it cannot be installed indoors. This presents a problem in that it makes it impossible to prepare for disasters such as earthquakes that occur unexpectedly while going about daily life.

[0011] This invention was created in view of the above-mentioned problems, and its purpose is to provide an earthquake-resistant reinforcement structure and a method for constructing it that can easily and simply improve the earthquake resistance of existing buildings while ensuring stable and high quality. Furthermore, through this earthquake-resistant reinforcement structure and method for constructing it, it is possible to prepare for disasters such as earthquakes that occur unexpectedly while people are going about their daily lives inside existing buildings. [Means for solving the problem]

[0012] The seismic reinforcement structure (1A) according to the present invention for solving the above problems includes at least one reinforcing structure (10A) composed of at least one reinforcing structural member (10A-1), at least a portion of the reinforcing structure is detachably disposed in a space formed by at least two existing building structural members (1000), the portion comprises at least two contact portions (13-1010, 13-1030) that contact the building structural members deformed by external forces, and the reinforcing structural member is partially or entirely covered with polyurea resin, including at least two of the contact portions.

[0013] Furthermore, in the above-described seismic reinforcement structure, the reinforcing structural member may be formed to include a core made of a low-density material, and a portion or substantially all of its surface, including at least two of the contact portions, may be covered with polyurea resin.

[0014] Furthermore, in the above-described seismic reinforcement structure, at least two of the contact portions may be positioned such that at least a portion of the force input from the structural member of the building they contact forms a pair of opposing force components.

[0015] Furthermore, in the above-mentioned seismic reinforcement structure, at least two of the reinforcing structures, each located in a different space, may be configured to connect with each other so as to intersect at a predetermined angle.

[0016] Furthermore, in the above-described seismic reinforcement structure, the multiple reinforcing structures, each arranged in a different space, may be configured to connect with one another in such a way that they form a polyhedron.

[0017] Furthermore, in the above-mentioned seismic reinforcement structure, the polyhedron may be configured to be a hexahedron.

[0018] Furthermore, the construction method for the seismic reinforcement structure according to the present invention for solving the above problems includes the steps of: measuring the size of the space formed between at least two of the above structural members for a building; manufacturing at least one of the above reinforcing structural members based on the measured dimensions; and detachably fixing at least one of the above reinforcing structures, which is made up of the manufactured at least one of the above reinforcing structural members, to the above structural members for a building.

[0019] For reference, the reference numerals in the drawings for each of the above components in the embodiments of the present invention described later are indicated in parentheses. [Effects of the Invention]

[0020] According to the seismic reinforcement structure of the present invention, a reinforcing structure is used in which the surface of a core material formed of a lightweight low-density material or the like is coated with a polyurea resin having excellent mechanical properties such as tensile strength and hardness, so that it is possible to provide a seismic reinforcement structure with high seismic reinforcement performance at low cost and through simple construction. In addition, the construction method for the seismic reinforcement structure of the present invention is easy to manage and can stably ensure high quality. Brief Description of the Drawings

[0021] [Figure 1] This is a perspective view showing a mode of attaching the reinforcing structure to a structural member for a building in the seismic reinforcement structure according to the first embodiment of the present invention. [Figure 2] This is a perspective view showing a state where the reinforcing structure is attached to a structural member for a building in the seismic reinforcement structure according to the first embodiment of the present invention. [Figure 3] This is a cross-sectional view taken along line P1-P1 in Figure 2. [Figure 4] This is a cross-sectional view taken along line P2-P2 in Figure 2. [Figure 5] This is a first partial enlarged view enlarging part A in Figure 3. [Figure 6] This is a second partial enlarged view enlarging part A in Figure 3. [Figure 7] This is a third partial enlarged view enlarging part A in Figure 3. [Figure 8] This is a schematic diagram showing a deformed state of the structural member for a building in the seismic reinforcement structure according to the first embodiment of the present invention. [Figure 9] This is a perspective view showing a mode of attaching the reinforcing structure to a structural member for a building in the seismic reinforcement structure according to the second embodiment of the present invention. [Figure 10] This is a perspective view showing a state where the reinforcing structure is attached to a structural member for a building in the seismic reinforcement structure according to the second embodiment of the present invention. [Figure 11] This is a perspective view showing a mode of attaching the reinforcing structure to a structural member for a building in the seismic reinforcement structure according to the third embodiment of the present invention. [Figure 12]This is a perspective view showing the state in which the reinforcing structure is attached to a structural member of a building in a seismic reinforcement structure according to a third embodiment of the present invention. [Figure 13] Figure 12 shows a cross-sectional view along the line P3-P3. [Figure 14] This is a perspective view showing how a reinforcing structure is attached to a structural member of a building in a seismic reinforcement structure according to a fourth embodiment of the present invention. [Figure 15] This is a perspective view showing the state in which the reinforcing structure is attached to a structural member of a building in a seismic reinforcement structure according to the fourth embodiment of the present invention. [Figure 16] This is a perspective view showing the state in which the reinforcing structure is attached to a structural member of a building in a seismic reinforcement structure according to the fifth embodiment of the present invention. [Figure 17] This is a schematic diagram showing the relationship between the loading point and the support point position in a trisection bending test of a reinforcing structural member. [Figure 18] This is a graph of the P-δ curve showing the relationship between deflection displacement (mm) and load (N) obtained in a trisection bending test of a reinforcing structural member. [Figure 19] Photograph 1 shows the state of the test specimen during a three-part bending test of a reinforcing structural member while it is being loaded. [Figure 20] Photograph 2 shows the state of the test specimen during a three-part bending test of a reinforcing structural member while it is being loaded. [Modes for carrying out the invention]

[0022] Hereinafter, the first to fifth embodiments of the present invention will be described with reference to Figures 1 to 16. Note that material compositions, shapes and structures, manufacturing methods, etc., that are not described here may be the same as or substantially the same as those known to those skilled in the art.

[0023] In the description, front / back, left / right, and up / down are defined relative to the coordinate axes in each drawing. Specifically, the X direction defines the left / right or lateral direction, with +X defining the left direction and -X defining the right direction. The Y direction defines the front / back or depth direction, with +Y defining the front direction and -Y defining the back direction. Furthermore, the Z direction defines the up / down or height direction parallel to the direction in which gravity acts, with +Z defining the up direction and -Z defining the down direction.

[0024] Therefore, Figure 1 shows the form of the seismic reinforcement structure 1A as viewed from the left front direction. Note that since each figure is a conceptual diagram, some of the form may be exaggerated. For this reason, the lengths and thicknesses of each element constituting the seismic reinforcement structure 1A, as well as the dimensions of each recess provided in each member, may be shown at different scales.

[0025] Furthermore, in this specification, "abbreviated" does not only mean strictly identical, but also includes errors or modifications that do not result in a loss of identity. For example, "abbreviated whole" does not mean strictly the whole, but includes forms that can be considered equivalent to the whole from the standpoint of effect.

[0026] In this embodiment, for convenience, existing structural members for buildings are represented with the minimum necessary configuration. Specifically, in the first embodiment (seismic reinforcement structure 1A), the second embodiment (seismic reinforcement structure 1B), and the third embodiment (seismic reinforcement structure 1C), existing structural members for buildings are represented with a configuration consisting only of four members, an insulating member disposed in the space formed by these members, and an exterior wall member. In the fourth embodiment (seismic reinforcement structure 1D) and the fifth embodiment (seismic reinforcement structure 1E), existing structural members for buildings are represented with a configuration consisting only of seven members, an insulating member disposed in the space formed by these members, and an exterior wall member.

[0027] ≪First Embodiment≫ First, the seismic reinforcement structure 1A according to the first embodiment of the present invention will be described with reference to Figures 1 to 8. The seismic reinforcement structure according to this embodiment is one of the simplest forms.

[0028] <Configuration of seismic reinforcement structure 1A> As shown in Figures 1 and 2, the seismic reinforcement structure 1A consists of a single reinforcing structure 10A that is placed inside a space W formed by existing structural members 1000 for the building, specifically a space surrounded by four members, more specifically, a space W enclosed on the left-right and up-down directions (left and right sides and top and bottom surfaces) by a first structural member 1010 extending in the upper left-right direction, a second structural member 1020 extending vertically on the left side, a third structural member 1030 extending in the lower left-right direction, and a fourth structural member 1040 extending vertically on the right side. The space W is closed off on the outdoor side of the building (the rear side located in the rear direction) by an exterior wall material 1100 and an insulating member 1200 placed on the interior side of the exterior wall material 1100.

[0029] Here, the existing structural members for buildings of the present invention include not only structural members that constitute already completed buildings, but also structural members that constitute buildings under construction. That is, the applications of the seismic reinforcement structure and its construction method of the present invention include not only the use of remodeling and renovation to reinforce already completed and used buildings against earthquakes, but also the use of reinforcing buildings that are planned for construction or are under construction. Since the reinforcing structures that constitute the seismic reinforcement structure of the present invention are detachably arranged in the space formed between the structural members of the building, their configuration can be easily and simply changed in response to design changes immediately before or during construction, construction conditions at the construction site, etc.

[0030] As shown in the cross-sectional views in Figures 3 and 4, the reinforcing structure 10A is composed of at least one reinforcing structural member 10A-1, which consists of a core material 11 and a polyurea resin layer 12 covering the entire outer surface of the core material 11 (therefore, the reinforcing structure 10A and the reinforcing structural member 10A-1 are substantially the same element).

[0031] The core material 11 is a functional element that defines the basic form of the reinforcing structure 10A (reinforcing structural member 10A-1), and also functions as a mold material. That is, polyurea resin is applied to the outer surface of the core material 11 to a predetermined thickness, and the reinforcing structure 10A is formed. For this reason, the core material 11 has a similar shape to the reinforcing structure 10A, and in a front view seen from the front, it has a roughly rectangular shape, and grooves having an L-shape in the vertical or horizontal cross-section are formed on the four sides that form the periphery. Grooves G are formed by applying polyurea resin to these grooves.

[0032] The material of the core material 11 is not limited as long as it can exhibit the seismic reinforcement effect of the present invention. It may be wood-based building materials such as laminated timber, CLT (Cross Laminated Timber), LVL (Laminated Veneer Lumber), or wood-based board. In order to simplify construction and reduce the load on existing buildings, it is preferable to form it from a low-density material with a low specific gravity, for example, from a low-density material that has air bubbles or voids inside. Specifically, examples include foamed closed-cell resin materials such as polystyrene foam and Styrofoam (registered trademark), and resin corrugated cardboard having a truss structure or honeycomb structure. These low-density materials are manufactured by existing methods such as injection molding and extrusion molding. From the viewpoint of balance between mechanical strength and weight, surface paintability, and manufacturing cost, polystyrene foam is the most preferred. In this embodiment, it is manufactured by injection molding using rigid polystyrene foam with an expansion ratio of 35.

[0033] The dimensions of the core material 11 are not limited as long as they can exhibit the seismic reinforcement effect of the present invention. They are formed to fit the space formed between at least two existing structural members 1000 for buildings and are set to obtain a predetermined seismic reinforcement effect. For example, when the core material 11 is made of wood building material, its thickness direction (Y direction) is preferably in the range of 1 to 5 cm, and more preferably in the range of 2 to 4 cm. When the core material 11 is made of a low-density material such as expanded polystyrene, its thickness direction (Y direction) is preferably in the range of 5 to 30 cm, and more preferably in the range of 10 to 20 cm. The core material 11 is formed, for example, by cutting, machining, heat processing, etc., using a plate-shaped material member to create the overall shape and process the unevenness and grooves of the contact portion. Multiple material members of different shapes may be combined by bonding, fitting, welding, etc., to form the overall shape and process the unevenness and grooves of the contact portion. By combining multiple material members of different shapes to form the core material, standard plate materials and square timbers can be used, eliminating the need for special molds, etc., and reducing manufacturing costs.

[0034] It is known that foamed resin materials such as polystyrene foam shrink after molding, and the shrinkage rate and the time it takes for the shrinkage to subside after molding vary depending on the resin material used and the molding conditions. Therefore, when forming the core material 11 with foamed resin materials such as polystyrene foam, the molding dimensions are determined considering the shrinkage rate, and the overall molding, processing of contact parts, and coating with polyurea resin are carried out considering the time it takes for the shrinkage to subside.

[0035] Furthermore, although the polyurea resin itself is flame-retardant, it is preferable that the reinforcing structure 10A (reinforcing structural member 10A-1) is non-combustible as a building material. One method for improving flame retardancy and imparting non-combustibility is to form a non-combustible topcoat layer on top of the polyurea resin layer that covers the outer surface of the core material. Alternatively, a non-combustible agent may be kneaded into the resin material that forms the core material 11 to impart non-combustibility to the core material.

[0036] The polyurea resin applied to the entire outer surface of the core material 11 is a resin having high tensile strength and flexibility, and is a resin compound mainly composed of urea bonds formed by a chemical reaction between an isocyanate component (main agent) and an amine component (curing agent). The chemical structure, ratio, weight-average molecular weight, etc., of both components constituting the polyurea resin are not limited as long as the desired mechanical properties (tensile strength, tear resistance, elongation, hardness, etc.) and suitable pot life can be obtained. Furthermore, polyurea resins are classified into pure polyurea with 100% amine component, polyurea with 80% or more amine component, and hybrid polyurea with amine component > alcohol (polyol) component, depending on the composition of the curing agent used in the reaction. However, the polyurea resin used in the present invention may include polyurea other than pure polyurea and hybrid polyurea as long as it can exhibit the desired seismic reinforcement effect of the present invention. The polyurea resin layer 12 in this embodiment is formed using Rhino Linings' Extreme HP11-50, which is composed of an aromatic isocyanate and 100% amine components that provide excellent mechanical properties.

[0037] Here, the thickness of the polyurea resin layer 12 is preferably determined considering the advantages of polyurea resin, such as its high curing speed and excellent mechanical properties (tensile strength, tear resistance, elongation, hardness, etc.) resulting from curing. Specifically, it is formed on the surface of the core material 11 to a thickness of 1.0 to 5.0 mm, preferably 1.5 to 4.5 mm, and more preferably 2.0 to 4.0 mm. This makes it possible to provide a reinforcing structure 10A that is lightweight and highly productive while possessing high strength and rigidity.

[0038] The preferred method for forming a polyurea resin layer on the outer surface of the core material 11 is spray painting using a spray gun or the like, which allows for easy control of the coating thickness and offers excellent workability. Existing spraying equipment can be used to spray the polyurea resin onto the core material. The spraying equipment is a device that sprays a mist-like polyurea resin, produced by a chemical reaction of a polyisocyanate component and an amine component by collision mixing at high temperature, onto the object to be coated. In this embodiment, the surface of the core material 11 is relatively smooth, but when spraying onto a core material with a recess, the conditions such as the temperature at which the main agent and hardener of the spraying equipment are heated, the tank pressure for delivery, and the discharge amount and mixing ratio of the main agent and hardener are adjusted so that a polyurea layer of the desired thickness is formed on the inner wall surface. Multiple polyurea resins with different pot lifespans may be used. The method of coating with polyurea resin is not limited to spraying, and other existing methods may be used as appropriate. For example, dip coating, which involves immersing the core material 11 in a mixed solution of two components and then removing and drying it to form a polyurea resin layer, and hand coating using a brush or roller brush are examples of such methods. These methods may also be combined.

[0039] To obtain the desired seismic reinforcement effect of the present invention, it is necessary that a portion of the outer surface of the core material 11, including at least two contact portions (13-1010, 13-1030), be coated with polyurea resin. Preferably, the majority of the outer surface of the core material 11, including at least two contact portions, is coated with polyurea resin, and more preferably, substantially the entire outer surface is coated with polyurea resin. The majority of the outer surface of the core material 11 means 50% or more, preferably 75% or more, of the total outer surface area. It is also known that polyurea resin shrinks slightly after coating. Therefore, if the core material 11 is formed from a foaming resin material or the like and polyurea resin is broadly coated on only one side, the entire core material 11 may warp due to the shrinkage of the polyurea resin after coating. To prevent this warping, it is preferable to coat both sides of the two opposing upper and lower surfaces of the rectangular plate-shaped core material 11 in plan view with substantially the same area.

[0040] The reinforcing structure 10A (reinforcing structural member 10A-1) consists of a plate-shaped member that is substantially rectangular in shape when viewed from the front, as shown in Figures 1 and 2. In this embodiment, it consists of a flat plate-shaped member without irregularities, but irregularities may be provided on the surface to increase rigidity. The four sides forming the periphery of the reinforcing structure 10A face the four members that constitute the existing structural member 1000 for the building. Specifically, the first side S-1010 extending horizontally at the top faces the first structural member 1010 for the building, the second side S-1020 extending vertically on the left side faces the second structural member 1020 for the building, the third side S-1030 extending horizontally at the bottom faces the third structural member 1030 for the building, and the fourth side S-1040 extending vertically on the right side faces the fourth structural member 1040 for the building. Furthermore, grooves G, which are L-shaped in either a vertical or horizontal cross-section, are formed on each of these four sides S-1010 to S-1040. Specifically, a first groove G-1010 is formed on the first side S-1010, which is L-shaped in a vertical cross-section; a second groove G-1020 is formed on the second side S-1020, which is L-shaped in a horizontal cross-section; a third groove G-1030 is formed on the third side S-1030, which is L-shaped in a vertical cross-section; and a fourth groove G-1040 is formed on the fourth side S-1040, which is L-shaped in a horizontal cross-section.

[0041] As shown in Figures 3 and 4, the first groove G-1010 to the fourth groove G1040 are configured to engage with the longitudinally extending ends of the existing structural members 1000 (first structural members 1010 to fourth structural members 1040). As a result, a portion of the reinforcing structure 10A is disposed within the space formed by the structural members 1000 (first structural members 1010 to fourth structural members 1040). In this embodiment, the above configuration is assumed because the structural members 1000 includes four members. However, for example, the existing structural members 1000 may include a first structural member 1010 extending horizontally upwards and a third structural member 1030 extending horizontally downwards, and a portion of the reinforcing structure 10A may be disposed within the space formed between these two members (first structural member 1010 and third structural member 1030).

[0042] Of the end faces defining the first groove G-1010 to the fourth groove G1040, the end faces that are located within the space W form end faces 13. Specifically, the upward-facing end face of the end face defining the first groove G-1010 forms the first end face 13-1010, the left-facing end face of the end face defining the second groove G-1020 forms the second end face 13-1020, the downward-facing end face of the end face defining the third groove G-1030 forms the third end face 13-1030, and the right-facing end face of the end face defining the fourth groove G-1040 forms the fourth end face 13-1040. At least two of these four end faces 13 are configured to abut against a part of an existing structural member 1000 for a building that deforms when an external force is applied, for example, due to an earthquake. In this embodiment, the first end face 13-1010 is configured to abut against the first structural member 1010 for the building, and the third end face 13-1030 is configured to abut against the third structural member 1030 for the building.

[0043] The first end face 13-1010 and the third end face 13-1030 may be configured to contact the first structural member 1010 and the third structural member 1030 of the building before deformation within the range of depth dimension D (dimension D in the front-rear direction), as shown in Figure 5; or they may be configured to create a predetermined clearance CL between them and the first structural member 1010 and the third structural member 1030 of the building before deformation, as shown in Figure 6; or they may be configured to contact the first structural member 1010 and the third structural member 1030 of the building via an elastic member SP.

[0044] The first end face 13-1010 and the third end face 13-1030 of the above configuration are positioned in such a way that they generate an equivalent reaction force to the external force input to the reinforcing structure 10A through the deformed existing structural member 1000 (first structural member 1010 and third structural member 1030). As a result, the deformed existing structural member 1000 is held in a static position without falling over, supported by the reinforcing structure 10A. That is, when the existing structural member 1000 deforms, as shown in Figure 8, the first end face 13-1010 comes into contact (pressure contact) with the first structural member 1010, which has a depth dimension D (dimension D in the front-to-back direction), and the third end face 13-1010, which has a depth dimension D (dimension D in the front-to-back direction), comes into contact (pressure contact) with the third structural member 1030. At this time, the external force F applied to the first structural member 1010 acts on the reinforcing structure 10A through the first end face 13-1010. Furthermore, this external force F acts on the third structural member 1030 through the third end face 13-1030. At each part on which the external force F acts, a reaction force R equivalent to the external force F is generated, thereby keeping each member in a stationary state. As a result, the first structural member 1010 and the third structural member 1030 are prevented from collapsing while their deformation is restricted.

[0045] The reinforcing structure 10A may be configured to be fixed to the existing structural member 1000 of the building using fastening elements that can be easily attached and detached, such as bolts and nuts, or it may be configured to be press-fitted into the existing structural member 1000 of the building via the end faces 13 (from the first end face 13-1010 to the fourth end face 13-1040).

[0046] In this embodiment, the reinforcing structure 10A is shown as a flat plate in each figure. However, if the building to be reinforced has functional parts such as doors and windows, openings for accommodating these functional parts will be appropriately formed.

[0047] Furthermore, irregularities may be provided on the surface of the reinforcing structure 10A regardless of the presence or absence of functional parts such as doors and windows. By providing such irregularities, the values ​​of the second moment of area and section modulus of the reinforcing structure 10A in a predetermined cross-section, for example, a horizontal cross-section and / or a vertical cross-section, become larger. This is useful in providing the reinforcing structure 10A with high resistance to external forces, that is, in keeping the amount of deformation and the stress generated during deformation small when an external force is applied. In particular, it is useful to provide irregularities such as increasing the values ​​of the second moment of area and section modulus in a predetermined cross-section of the portion formed by the polyurea resin layer 12, which has excellent mechanical strength.

[0048] Alternatively, grooves with a V-shaped cross-section or the like may be provided on both sides or a portion or large portion of one side of the rectangular plate-shaped core material 11, and polyurea resin may be filled into these grooves to form reinforcing ribs facing inward. This increases the amount of polyurea resin coating and thus the manufacturing cost, but it allows for a larger value of the second moment of area and section modulus at a predetermined cross-section of the portion formed by the polyurea resin layer 12. Examples of reinforcing rib shapes include a parallel pattern in which multiple linear ribs are formed in parallel in a vertical or horizontal direction, and a honeycomb pattern in which regular hexagonal ribs are arranged in a staggered pattern. The opening width and depth of the grooves are set considering the balance between the reinforcing effect and the paintability and fillability of the polyurea resin, with a range of several tens of millimeters to several centimeters being an example.

[0049] Furthermore, a reinforcing mesh sheet may be joined to both sides, or to a portion or most of one side of the rectangular plate-shaped core material 11. The joining is achieved by laying the mesh sheet on the outer surface of the core material 11, and then spraying polyurea resin from above to form a polyurea resin layer. The mesh sheet can take the form of woven fabric, knitted fabric, nonwoven fabric, or honeycomb sheet, and the fibers constituting these can be carbon fiber, glass fiber, basalt fiber, or aramid fiber. The thickness of the mesh sheet is in the range of 0.2 to 1.0 mm, and the basis weight is 200 to 800 g / m². 2 Examples of this range include void ratios ranging from 50% to 95%.

[0050] <Assembly method for seismic reinforcement structure 1A> Seismic reinforcement structure 1A is assembled through a procedure such as the following: First, the structural members 1000 of the building to be seismically reinforced in the existing building are exposed. For example, by removing the lining of the side wall surface of a small room in a typical house, a pair of beams corresponding to the first structural member 1010 and the third structural member 1030 in this embodiment are exposed, and a pair of columns corresponding to the second structural member 1020 and the fourth structural member 1040 are exposed. At this time, the insulation material 1200 may be left in place. However, if the core material 11 of the reinforcing structure 10A (reinforcing structural member 10A-1) is made of a material with high thermal insulation properties (low thermal conductivity) and has a predetermined thickness, and can satisfy the desired thermal insulation standard (UA value, etc.), then the reinforcing structure 10A (reinforcing structural member 10A-1) can also serve as insulation, and the insulation material 1200 may be removed.

[0051] Subsequently, in order to determine the size of the reinforcing structure 10A (reinforcing structural member 10A-1), the size of the space W in which it will be installed (housed) is measured. For example, in this embodiment, the height (vertical dimension) of the reinforcing structure 10A (reinforcing structural member 10A-1) is determined by measuring the distance between the first structural member 1010 and the third structural member 1030 (beam), and the width (horizontal dimension) of the reinforcing structure 10A (reinforcing structural member 10A-1) is determined by measuring the distance between the second structural member 1020 (column) and the fourth structural member 1040 (column). In addition, the thickness (front-to-back dimension) of the reinforcing structure 10A (reinforcing structural member 10A-1) is determined by measuring the depth of the space W with the insulation material 1200 remaining.

[0052] Here, as described above, grooves G having an L-shape in the vertical or horizontal cross-section are formed on the four sides that form the periphery of the reinforcing structure 10A (reinforcing structural member 10A-1), and these grooves G each have an end face 13 (first end face 13-1010, second end face 13-1020, third end face 13-1030, fourth end face 13-1040). The depth dimension D (dimension in the front-to-back direction) of these end faces 13 is set to be approximately equal to the depth of the space W.

[0053] A reinforcing structure 10A (reinforcing structural member 10A-1) having the dimensions determined by the above measurements is manufactured in a designated factory. Specifically, a reinforcing structure 10A (reinforcing structural member 10A-1) of the above dimensions is manufactured by coating the surface of a core material 11 made of a low-density material, such as expanded polystyrene, with a polyurea resin with a thickness of 1.0 to 4.0 mm. This manufactured reinforcing structure 10A (reinforcing structural member 10A-1) is then transported to the small room and fitted into the space W.

[0054] The reinforcing structure 10A (reinforcing structural member 10A-1) fitted into the space W is fixed in a stationary state by being detachably attached to the existing structural member 1000 of the building using mechanical fastening elements such as bolts and nuts, as described above, or by press-fitting through the end faces 13 (from the first end face 13-1010 to the fourth end face 13-1040). In addition to the bolts and nuts mentioned above, the mechanical fastening elements may be various known joints consisting of engageable complementary shapes of protrusions and recesses or snap-fits formed on the opposing parts of the two members. Alternatively, a separate element specifically for connection may be used. By forming the core material 11 from a low-density material such as expanded polystyrene, the press-fitting fixation work is made easier and a certain degree of dimensional error can be tolerated.

[0055] When using mechanical fastening elements such as bolts and nuts, for example, the first structural member 1010 (beam), the second structural member 1020 (column), the third structural member 1030 (beam), and the fourth structural member 1040 (column) are detachably fixed to each of them via bolts and nuts. In the case of fixing by press-fitting, the height and / or width dimensions of the reinforcing structure 10A (reinforcing structural member 10A-1) are set to be larger than those of the height and / or width of the space W by the amount of the overlap.

[0056] After the reinforcing structure 10A is fixed to the existing structural member 1000 of the building, the surface of the reinforcing structure 10A that is in contact with the interior space is lined with a base material, cloth, and / or paint. As a result, although the interior dimensions in the left / right, front / back, and / or up / down directions of the interior space are narrowed by the thickness of the fixed reinforcing structure 10A (reinforcing structural member 10A-1), an interior space is created that is almost the same as the state before seismic reinforcement.

[0057] <Effects of seismic reinforcement structure 1A> According to the seismic reinforcement structure 1A of the first embodiment of the above configuration, the outer surface of the core material 11 made of a low-density material is covered with a polyurea resin layer 12 having high tensile strength and flexibility, thereby making a reinforcing structure 10A that is lightweight yet possesses high strength and rigidity. Furthermore, seismic performance can be suitably improved by simply fitting the reinforcing structure 10A into a space W surrounded on all sides by existing building structural members 1000 (first building structural member 1010, second building structural member 1020, third building structural member 1030, and fourth building structural member 1040) and closed off at the rear by exterior wall material 1100 and insulation member 1200, such that the end faces of the first groove G-1010, second groove G-1020, third groove G-1030, and fourth groove G-1040 abut against the existing building structural members 1000. This makes it possible to provide seismic reinforcement structures that offer high seismic resistance performance with low cost and simple construction.

[0058] ≪Second Embodiment≫ Next, a seismic reinforcement structure 1B according to a second embodiment of the present invention will be described with reference to Figures 9 and 10. Compared to seismic reinforcement structure 1A, seismic reinforcement structure 1B differs in that while the reinforcing structure 10A is composed of one piece, the reinforcing structure 10B is composed of three pieces: a first reinforcing structural member 10B-1, a second reinforcing structural member 10B-2, and a third reinforcing structural member 10B-3. The other components are the same. Therefore, a description of the identical components will be omitted.

[0059] As shown in Figure 9, the first reinforcing structural member 10B-1 constitutes the left end of the reinforcing structure 10B, the second reinforcing structural member 10B-2 constitutes the central part of the reinforcing structure 10B, and the third reinforcing structural member 10B-3 constitutes the right end of the reinforcing structure 10B. The first reinforcing structural member 10B-1 has a protrusion 11B-1 on the end face facing the second reinforcing structural member 10B-2. The second reinforcing structural member 10B-2 has a recess 12B-2 on the end face facing the first reinforcing structural member 10B-1 and a protrusion 11B-2 on the end face facing the third reinforcing structural member 10B-3. The third reinforcing structural member 10B-3 has a recess 12B-3 on the end face facing the second reinforcing structural member 10B-2.

[0060] As shown in Figure 10, the convex portion 11B-1 and the concave portion 12B-2 have complementary shapes, and the convex portion 11B-2 and the concave portion 12B-3 also have complementary shapes. As a result, the convex portion 11B-1 and the concave portion 12B-2, and the convex portion 11B-2 and the concave portion 12B-3 engage with each other without any gaps. Consequently, the first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3 are configured to remain connected to each other without separating even when external forces are applied. This connection configuration can be any known connection configuration. For example, it may be a connection configuration of various joints and connections composed of complementary convex and concave portions used for joining wood, or it may be a connection configuration using mechanical fastening elements such as bolts and nuts, as in the third embodiment described later. Mechanical fastening elements such as bolts and nuts may be combined with connection configurations such as joints and connections. The shapes of the convex and concave portions having the complementary shapes described above can be determined as appropriate according to these various connection configurations.

[0061] In the seismic reinforcement structure 1B according to the second embodiment, the reinforcing structure 10B is divided into three parts, but the number of divisions is not limited to this number and can be set as appropriate according to various requirements. For example, to meet the requirement of increasing the seismic strength per unit area of ​​the wall, although this will increase the amount of polyurea resin coating and thus the manufacturing cost, it is useful to increase the number of divisions. Also, to meet the requirement of improving workability, it is useful to set the number of divisions based on a size that can be easily grasped by one worker.

[0062] <Assembly method for seismic reinforcement structure 1B> Seismic reinforcement structure 1B can be assembled using the following procedure, for example. First, similar to seismic reinforcement structure 1A, the structural members 1000 of the building to be reinforced for seismic purposes in the existing building are exposed. For example, by removing the interior lining of the side wall of the living room of a typical house, a pair of beams corresponding to the first structural member 1010 and the third structural member 1030 in this embodiment are exposed, and a pair of columns corresponding to the second structural member 1020 and the fourth structural member 1040 are also exposed. At this time, the insulation material 1200 may be left in place or removed, similar to seismic reinforcement structure 1A.

[0063] Subsequently, the size of the space W in which the reinforcing structure 10B will be installed (housed) is measured using the same procedure as for the seismic reinforcement structure 1A, and the size of the seismic reinforcement structure 1B is determined. Furthermore, based on the determined size of the seismic reinforcement structure 1B, the width (horizontal dimension) is divided into three parts to determine the width (horizontal dimension) of the first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3. For example, the height (vertical dimension) and depth (front-to-back dimension) are left as they are, and only the width (horizontal dimension) is divided into three equal parts to determine the size of the first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3.

[0064] Based on the dimensions determined by the above measurements, the first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3, which constitute the reinforcing structure 10B, are manufactured at a designated factory. The manufactured first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3 are then transported to the living room and fitted into the space W.

[0065] Specifically, the first reinforcing structural member 10B-1 is positioned so that its left side abuts against the left side of the space W. At this time, the first end face 13-1010-1 of the first reinforcing structural member 10B-1 is positioned to directly abut the first building structural member 1010, or to abut it via an elastic member SP, or to face it via a clearance CL. Furthermore, the second end face 13-1020-1 of the first reinforcing structural member 10B-1 is positioned to directly abut the second building structural member 1020, or to abut it via an elastic member SP, or to face it via a clearance CL. In addition, the third end face 13-1030-1 of the first reinforcing structural member 10B-1 is positioned to directly abut the third building structural member 1030, or to abut it via an elastic member SP, or to face it via a clearance CL.

[0066] Next, the second reinforcing structural member 10B-2 is positioned so that its recessed portion 12B-2 engages with the protrusion 11B-1 of the first reinforcing structural member 10B-1. At this time, the first end face 13-1010-2 of the second reinforcing structural member 10B-2 is in direct contact with the first building structural member 1010, or in contact via the elastic member SP, or facing it via a clearance CL. Furthermore, the third end face 13-1030-2 of the second reinforcing structural member 10B-2 is positioned so that it is in direct contact with the third building structural member 1030, or in contact via the elastic member SP, or facing it via a clearance CL.

[0067] Next, the third reinforcing structural member 10B-3 is positioned so that its recessed portion 12B-3 engages with the protrusion 11B-2 of the second reinforcing structural member 10B-2. At this time, the third end face 13-1030-3 of the third reinforcing structural member 10B-3 is positioned to directly contact the third building structural member 1030, or to contact it via an elastic member SP, or to face it via a clearance CL. Furthermore, the fourth end face 13-1040-3 of the third reinforcing structural member 10B-3 is positioned to directly contact the fourth building structural member 1040, or to contact it via an elastic member SP, or to face it via a clearance CL.

[0068] The first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3, which are fitted into space W, are each fixed to the existing building structural member 1000, for example, in the same manner as the reinforcing structure 10A-1 (reinforcing structural member 10A), so that they remain stationary.

[0069] The surfaces of the reinforcing structure 10B that are in contact with the interior space, that is, the surfaces of the first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3 that are in contact with the interior space, are lined with a base material, cloth, and / or paint, similar to the reinforcing structure 10A. As a result, although the interior dimensions of the interior space are narrowed by the thickness of the fixed reinforcing structure 10B, an interior space is created that is almost the same as the state before seismic reinforcement.

[0070] <Effects of seismic reinforcement structure 1B> The seismic reinforcement structure 1B according to the second embodiment of the above configuration provides the following effects in addition to the effects of the seismic reinforcement structure 1A according to the first embodiment. Specifically, the reinforcing structure 10B is divided into multiple members such as the first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3, which improves the workability of transporting and fitting the structure into the space W. Furthermore, in the manufacturing process, it is easier to form the polyurea resin layer 12 on a relatively small panel-shaped core material 11 than to form the polyurea resin layer 12 on a relatively large panel-shaped core material 11, thus making it possible to easily manufacture a high-quality reinforcing structure 10B.

[0071] Furthermore, the first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3, which constitute the reinforcing structure 10B, are each coated on their outer surfaces with a polyurea resin having high tensile strength. For this reason, the amount of polyurea resin per unit volume of the reinforcing structure 10B is greater than that of the reinforcing structure 10A. The external force resulting from the deformation of the existing structural member 1000 for the building is then input to the reinforcing structure 10B in a manner that is distributed among the first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3. The first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3, each possessing high strength, are able to suitably receive this distributed external force.

[0072] Furthermore, in order to enhance resistance to external forces, as described above, it is desirable to configure the reinforcing structure 10B such that the section modulus and moment of inertia of area are large in predetermined cross-sections, for example, horizontal and / or vertical cross-sections. The form of division may be appropriately selected to achieve this desirable configuration. In particular, it is desirable to set the form of the reinforcing structure 10B such that the section modulus and moment of inertia of area are large in predetermined cross-sections of the portion formed by the polyurea resin layer 12, which has excellent mechanical strength, and to divide the reinforcing structure 10B so that many polyurea resin layers 12 with such large section modulus and moment of inertia of area appear.

[0073] For example, although the amount of polyurea resin coating increases and manufacturing costs rise, in order to improve resistance to vertical external forces, it is useful to set the shape of the reinforcing structure 10B so that the section modulus and moment of inertia of area in the vertical section are large, and to divide the reinforcing structure 10B into many long, narrow strip-shaped members in the vertical direction (up and down direction) so that many polyurea resin layers 12 in the vertical section with large section modulus and moment of inertia of area appear. In this embodiment, it is divided into 3 parts, but it is exemplified that it is divided into 4 to 8 parts depending on the size of the room in the building to be seismically reinforced.

[0074] ≪Third Embodiment≫ Next, a seismic reinforcement structure 1C according to a third embodiment of the present invention will be described with reference to Figures 11 to 13. The only difference between this seismic reinforcement structure 1C and seismic reinforcement structure 1A is that while the reinforcing structure 10A was composed of one piece, the reinforcing structure 10C is composed of three pieces: a first reinforcing structural member 10C-1, a second reinforcing structural member 10C-2, and a third reinforcing structural member 10C-3. Furthermore, the only difference between this and seismic reinforcement structure 1B is that the three pieces, the second reinforcing structural member 10C-2 and the third reinforcing structural member 10C-3, are connected using connecting elements. Note that the other configurations are the same as those of seismic reinforcement structure 1A and / or seismic reinforcement structure 1B, so their description will be omitted.

[0075] As shown in Figure 11, the first reinforcing structural member 10C-1 constitutes the left end of the reinforcing structure 10C, the second reinforcing structural member 10C-2 constitutes the central part of the reinforcing structure 10C, and the third reinforcing structural member 10C-3 constitutes the right end of the reinforcing structure 10C. The first reinforcing structural member 10C-1 has a connecting tab 11C-1 on its end face facing the second reinforcing structural member 10C-2 that functions as a connecting portion (joint part) between adjacent members. Similarly, the second reinforcing structural member 10C-2 has a connecting tab 11Ca-2 on its end face facing the first reinforcing structural member 10C-1 and a connecting tab 11Cb-2 on its end face facing the third reinforcing structural member 10C-3. The third reinforcing structural member 10C-3 has a connecting tab 11C-3 on its end face facing the second reinforcing structural member 10C-2. As a result, the fastening ears 11C-1 and 11Ca-2 face each other, and the fastening ears 11Cb-2 and 11C-3 face each other. In this embodiment, the fastening ears 11C-1, 11Ca-2, 11Cb-2, and 11C-3 are all formed to protrude towards the interior of the room. However, the fastening ears 11C-1, 11Ca-2, 11Cb-2, and 11C-3 may also be formed to protrude towards the exterior of the room.

[0076] The connecting tabs 11C-1, 11Ca-2, 11Cb-2, and 11C-3 are formed from, for example, a rigid synthetic resin containing a fire-retardant, and are bonded to the right end face of the first reinforcing structural member 10C-1, the left and right end faces of the second reinforcing structural member 10C-2, and the left end face of the third reinforcing structural member 10C-3 using, for example, an adhesive. The bonding surface of the polyurea resin layer may be pre-treated with a primer for bonding.

[0077] The fastening tabs 11C-1, 11Ca-2, 11Cb-2, and 11C-3 each have three through holes H at opposing positions. As shown in Figures 12 and 13, the first reinforcing structural member 10C-1, the second reinforcing structural member 10C-2, and the third reinforcing structural member 10C-3 are connected to each other by screwing bolts Bo and nuts Nu into the through holes H that open in the fastening tabs 11C-1, 11Ca-2, 11Cb-2, and 11C-3.

[0078] The connection method between the bolt Bo and nut Nu described above, which involves screwing them together, may be a connection method using different known mechanical fastening elements. For example, a U-shaped fitting may be used to sandwich a pair of opposing fastening lugs, and the bolt and nut may be screwed together in this state to connect them. Alternatively, a clip-shaped fastening element may be used to connect them using the elastic force of that element, or a snap-fit ​​connection method may be used.

[0079] The form of the connecting tab, which functions as a joint, may be a form that protrudes outward, or a form that follows the surface to be seismically reinforced. Furthermore, it may be a form that imitates various joints and connections used for joining wood, etc. The form of the connecting tab can be arbitrarily selected from various forms considering ease of assembly, and multiple forms may be combined.

[0080] <Assembly method for seismic reinforcement structure 1C> Seismic reinforcement structure 1C is basically assembled using the same procedure as seismic reinforcement structure 1B. However, some procedures differ due to the difference in the connection configuration of the first reinforcing structural member 10B-1, the second reinforcing structural member 10B-2, and the third reinforcing structural member 10B-3 in seismic reinforcement structure 1B, and the connection configuration of the first reinforcing structural member 10C-1, the second reinforcing structural member 10C-2, and the third reinforcing structural member 10C-3 in seismic reinforcement structure 1C.

[0081] Specifically, the first reinforcing structural member 10C-1 is positioned so that its left side abuts against the left side of space W, and then the second reinforcing structural member 10C-2 is positioned so that its own fastening tab 11C-2 abuts against the fastening tab 11C-1 of the first reinforcing structural member 10B-1. At this time, the three through holes H opening in the fastening tab 11C-1 and the three through holes H opening in the fastening tab 11C-2 are connected. Then, bolts Bo are inserted into the three sets of through holes H, and nuts Nu are screwed onto them to connect the first reinforcing structural member 10C-1 and the second reinforcing structural member 10C-2. The second reinforcing structural member 10C-2 and the third reinforcing structural member 10C-3 are connected in the same manner.

[0082] <Effects of seismic reinforcement structure 1C> According to the third embodiment of the above configuration, the seismic reinforcement structure 1C provides the same effects as the seismic reinforcement structure 1B according to the second embodiment. Furthermore, the joint strength of the reinforcing structure 10C is increased compared to the reinforcing structure 10B of the seismic reinforcement structure 1B according to the second embodiment, thereby suitably improving seismic performance.

[0083] ≪Fourth Embodiment≫ Next, a seismic reinforcement structure 1D according to the fourth embodiment of the present invention will be described with reference to Figures 14 and 15. This seismic reinforcement structure 1D differs from the seismic reinforcement structure 1A in that the existing building structural member 1000 is assembled to include two planes connected in an L-shape in horizontal cross-section, and two reinforcing structures 10D (the first reinforcing structure 10Dα and the second reinforcing structure 10Dβ, which will be described later) are arranged along these two planes. The other configurations are the same. Therefore, a description of the identical configurations will be omitted.

[0084] The reinforcing structure 10D is composed of a first reinforcing structure 10Dα and a second reinforcing structure 10Dβ. Specifically, as shown in Figure 14, it consists of a first reinforcing structure 10Dα disposed inside a space W1 enclosed in the left-right and up-down directions (left and right sides and top and bottom surfaces) by a first structural member 1010 extending in the upper left-right direction, a second structural member 1020 extending vertically on the left side, a third structural member 1030 extending in the lower left-right direction, and a fourth structural member 1040 extending vertically on the right side, and a second reinforcing structure 10Dβ disposed inside a space W2 enclosed in the front-rear and up-down directions (front and rear sides and top and bottom surfaces) by a fourth structural member 1040, a fifth structural member 1050 extending in the upper front-rear direction, a sixth structural member 1060 extending vertically on the front side, and a seventh structural member 1070 extending in the lower front-rear direction. In this embodiment, the first reinforcing structure 10Dα is formed from a single panel-shaped member, the first reinforcing structural member 10Dα-1, and the second reinforcing structure 10Dβ is formed from a single panel-shaped member, the second reinforcing structural member 10Dβ-1 (therefore, the first reinforcing structure 10Dα and the first reinforcing structural member 10Dα-1 are substantially the same element, and the second reinforcing structure 10Dβ and the second reinforcing structural member 10Dβ-1 are substantially the same element).

[0085] The first reinforcing structure 10Dα (first reinforcing structural member 10Dα-1) and the second reinforcing structure 10Dβ (second reinforcing structural member 10Dβ-1) are connected via a pair of protrusions 11D and recesses 12D. As shown in Figure 14, the protrusions 11D and recesses 12D have complementary shapes, which allows them to engage with each other without gaps. As a result, the first reinforcing structure 10Dα (first reinforcing structural member 10Dα-1) and the second reinforcing structure 10Dβ (second reinforcing structural member 10Dβ-1) are configured to remain connected without separating from each other even when external forces are applied. In this embodiment, the complementary shape is approximately a rectangular parallelepiped, but other shapes may be used, for example, a key shape to increase the joint strength while considering ease of assembly. Furthermore, various known connection forms can be used for the connection. For example, various joints and connections composed of complementary protrusions and recesses used for joining wood may be used. As in the third embodiment described above, the connection may be made using bolts and nuts, as well as mechanical fastening elements such as snap-fits. Mechanical fastening elements such as bolts and nuts may be combined with connection forms such as joints and connections. The shapes of the convex and concave portions having complementary shapes can be determined as appropriate according to these various connection forms.

[0086] <Assembly method for seismic reinforcement structure 1D> For the assembly of the seismic reinforcement structure 1D, the dimensions of each part of the first reinforcing structure 10Dα (first reinforcing structural member 10Dα-1) and the second reinforcing structure 10Dβ (second reinforcing structural member 10Dβ-1) are determined in the same manner as the measurement work for the reinforcing structure 10A of the seismic reinforcement structure 1A, and the first reinforcing structure 10Dα of a size suitable for placement in space W1 and the second reinforcing structure 10Dβ of a size suitable for placement in space W2 are manufactured. Here, the first reinforcing structure 10Dα has a protrusion 11D formed to a predetermined size, and the second reinforcing structure 10Dβ has a recess 12D formed to a size that is complementary to the shape of the protrusion 11D.

[0087] The first reinforcing structure 10Dα (first reinforcing structural member 10Dα-1) and the second reinforcing structure 10Dβ (second reinforcing structural member 10Dβ-1) are arranged such that, for example, the second reinforcing structure 10Dβ, which has a recess 12D, is first placed in space W2, and then the first reinforcing structure 10Dα, which has a protrusion 11D, is placed in space W1. When placing the first reinforcing structure 10Dα in space W1, it is preferable to place the first reinforcing structure 10Dα in space W1 while maintaining the position in which the tip of the protrusion 11D is inserted into the recess 12D. The subsequent work procedure is the same as that of the seismic reinforcement structure 1A.

[0088] <Effects of seismic reinforcement structure 1D> According to the seismic reinforcement structure 1D of the fourth embodiment of the above configuration, in addition to the effects of the seismic reinforcement structure 1A of the first embodiment, the following effects are obtained. That is, the first reinforcing structure 10Dα (first reinforcing structural member 10Dα-1) and the second reinforcing structure 10Dβ (second reinforcing structural member 10Dβ-1) that constitute the reinforcing structure 10D are connected to each other, resulting in a three-dimensional form with a horizontal L-shaped cross-section. In this three-dimensional seismic reinforcement structure 1D, the section modulus and second moment of area in the horizontal cross-section are larger than those of the planar seismic reinforcement structures 1A, 1B, and 1C, resulting in higher rigidity than these structures. Therefore, deformation when a predetermined external force is applied is suitably suppressed compared to the planar seismic reinforcement structures 1A, 1B, and 1C, and the stress generated in the reinforcing structure 10 (first reinforcing structure 10Dα and second reinforcing structure 10Dβ) is kept small. As a result, a higher level of seismic resistance is achieved, exceeding that of seismic reinforcement structures 1A, 1B, and 1C.

[0089] ≪Fifth Embodiment≫ Finally, a seismic reinforcement structure 1E according to a fifth embodiment of the present invention will be described with reference to Figure 16. This seismic reinforcement structure 1E is a seismic reinforcement structure in which a plurality of reinforcing structures, each composed of a plurality of reinforcing structural members, each form a plurality of faces, for example, four sides of a hexahedron, and adjacent reinforcing structures are connected to each other. Specifically, as shown in Figure 16, the front side is formed by a first reinforcing structure 10Eα, the rear side is formed by a second reinforcing structure 10Eβ, the left side is formed by a third reinforcing structure 10Eγ, and the right side is formed by a fourth reinforcing structure 10Eδ. The first reinforcing structure 10Eα on the front side is connected to the adjacent third reinforcing structure 10Eγ and fourth reinforcing structure 10Eδ, and the second reinforcing structure 10Eβ on the rear side is connected to the adjacent third reinforcing structure 10Eγ and fourth reinforcing structure 10Eδ.

[0090] The connection configuration of adjacent reinforcing structures, for example, the connection configuration of the first reinforcing structure 10Eα, the third reinforcing structure 10Eγ, and the fourth reinforcing structure 10Eδ, may be a connection configuration in which a pair of convex and concave portions having complementary shapes engage, similar to the connection configuration of the first reinforcing structure 10Dα (first reinforcing structural member 10Dα-1) and the second reinforcing structure 10Dβ (second reinforcing structural member 10Dβ-1) in the seismic reinforcement structure 1D according to the fourth embodiment, or it may be another known connection configuration.

[0091] The first reinforcing structure 10Eα is composed of a first reinforcing structural member 10Eα-1, a second reinforcing structural member 10Eα-2, and a third reinforcing structural member 10Eα-3; the second reinforcing structure 10Eβ is composed of a first reinforcing structural member 10Eβ-1, a second reinforcing structural member 10Eβ-2, and a third reinforcing structural member 10Eβ-3; the third reinforcing structure 10Eγ is composed of a first reinforcing structural member 10Eγ-1 and a second reinforcing structural member 10Eγ-2; and the fourth reinforcing structure 10Eδ is composed of a first reinforcing structural member 10Eδ-1 and a second reinforcing structural member 10Eδ-2.

[0092] The first reinforcing structural member 10Eα-1, the second reinforcing structural member 10Eα-2, the third reinforcing structural member 10Eα-3, the first reinforcing structural member 10Eβ-1, the second reinforcing structural member 10Eβ-2, the third reinforcing structural member 10Eβ-3, the first reinforcing structural member 10Eγ-1, the second reinforcing structural member 10Eγ-2, the first reinforcing structural member 10Eδ-1, and the second reinforcing structural member 10Eδ-2 are all auxiliary structural members related to the first embodiment described above. The reinforcing structural member 10A-1 can be identical in form to any of the first reinforcing structural member 10B-1, second reinforcing structural member 10B-2, third reinforcing structural member 10B-3 according to the second embodiment, the first reinforcing structural member 10C-1, second reinforcing structural member 10C-2, third reinforcing structural member 10C-3 according to the third embodiment, or the first reinforcing structural member 10Dα, second reinforcing structural member 10Dβ according to the fourth embodiment. In this practical embodiment, the form is based on the first reinforcing structural member 10C-1, second reinforcing structural member 10C-2, and third reinforcing structural member 10C-3 according to the third embodiment, but the fastening lugs are configured to protrude outwards. As a result, the interior side is surrounded by a flat wall surface.

[0093] In the above-described embodiment, four of the six faces (sides) of the hexahedron are configured to be seismically reinforced through reinforcing structures. However, it is also possible to configure all six faces to be seismically reinforced through reinforcing structures, that is, in contrast to the above-described embodiment, the upper surface (ceiling surface of the room) is seismically reinforced by a fifth reinforcing structure 10Eε (not shown), and the lower surface (floor surface of the room) is seismically reinforced by a sixth reinforcing structure 10Eζ (not shown).

[0094] <Assembly method for seismic reinforcement structure 1E> The seismic reinforcement structure 1E is assembled by a procedure that basically combines the work procedure of the seismic reinforcement structure 1C according to the third embodiment and the work procedure of the seismic reinforcement structure 1D according to the fourth embodiment. In the seismic reinforcement structure 1E, the connecting tabs of each reinforcing structural member (first reinforcing structural member 10Eα-1, etc.) that constitute each reinforcing structure 10 (first reinforcing structure 10Eα to fourth reinforcing structure 10Eδ) are configured to protrude outwards. Therefore, if bolts and nuts can be screwed in from the outside, the same procedure as for the seismic reinforcement structure 1C can be followed. However, if bolts and nuts cannot be screwed in from the outside, adjacent reinforcing structural members can be connected in advance to form a reinforcing structure, and this reinforcing structure can be placed in the space W surrounded by the existing building structural members 1000. For example, the first reinforcing structural member 10Eα-1, the second reinforcing structural member 10Eα-2, and the third reinforcing structural member 10Eα-3 can be connected to form the first reinforcing structure 10Eα, and this first reinforcing structure 10Eα can be placed in a space W surrounded by existing structural members 1000 for buildings, such as the first structural member 1010, the second structural member 1020, the third structural member 1030, and the fourth structural member 1040.

[0095] <Effects of seismic reinforcement structure 1E> According to the fifth embodiment of the above configuration, the seismic reinforcement structure 1E provides a more pronounced effect than that of the seismic reinforcement structure 1D according to the fourth embodiment. Specifically, the first reinforcing structure 10Eα, second reinforcing structure 10Eβ, third reinforcing structure 10Eγ, and fourth reinforcing structure 10Eδ, which cover four of the six surfaces (ceiling, floor, and four sides) that define the interior space, are connected to each other to form a cylindrical, self-supporting seismic reinforcement structure 1E. In this cylindrical seismic reinforcement structure 1E, the section modulus and second moment of area in the horizontal and vertical sections are larger than those of the planar seismic reinforcement structures 1A, 1B, and 1C, and the three-dimensional seismic reinforcement structure 1D with a horizontal L-shaped section, resulting in higher rigidity than these structures.

[0096] Therefore, deformation when a predetermined external force is applied is suitably suppressed compared to seismic reinforcement structures 1A, 1B, 1C, and 1D, and the stress generated in each reinforcing structure 10 (first reinforcing structure 10Eα, second reinforcing structure 10Eβ, third reinforcing structure 10Eγ, and fourth reinforcing structure 10Eδ) is kept small. As a result, a higher seismic performance than that of seismic reinforcement structure 1A, etc. is achieved. Furthermore, up to 12 existing structural members 1000 for the building that define the edges of the interior space will all come into contact with the cylindrical seismic reinforcement structure 1E, and each of them will be seismically reinforced by the seismic reinforcement structure 1E. Moreover, with seismic reinforcement structure 1E, in which all six sides are seismically reinforced through the reinforcing structure, it functions as a complete room shelter, and the above effect becomes even more pronounced.

[0097] ≪Bending test of reinforcing structural members≫ A flat reinforcing structural member was fabricated by coating the surface of a rigid polystyrene foam core with polyurea resin. This member was used as a test specimen, and a static loading test was performed using a precision universal testing machine (Shimadzu Corporation: AGX-100kNV2) by performing a three-part bending test. The outline of the test specimen is shown below. Core material dimensions: 500mm (width) x 150mm (height) x 1,800mm (length) • Polyurea resin layer thickness: 2.5 mm • Core material: Rigid polystyrene foam (expansion ratio 30 times) • Polyurea resin: Rhino Linings Extreme HP11-50

[0098] Furthermore, Figure 17 shows the relationship between the loading point and support position in the trisection bending test, Figure 18 shows the P-δ curve indicating the relationship between deflection displacement (mm) and load (N) obtained by the test, and Figures 19 and 20 show the state of the test specimen during loading, respectively.

[0099] In the bending tests conducted in this study, the maximum load was 4768 N (486.2 kgf) and the deflection displacement was 146.6 mm. Coating with polyurea resin demonstrated a stable load-deformation relationship up to the maximum load, confirming its large deformation capacity. While a slight temporary decrease in load was observed when the applied load reached 4464 N (deflection displacement 120.8 mm), the load subsequently tended to recover.

[0100] After the loading test was completed, an additional bending test was conducted by loading the central part of the specimen, as shown in Figure 20, to confirm the remaining deformation capacity of the specimen. The deflection displacement at the center of the specimen reached a maximum of 190 mm, but no cracks occurred on the polyurea coated surface, and the specimen itself remained in a sound condition.

[0101] By connecting multiple reinforcing structural members that possess high mechanical strength and large deformation capacity similar to that of this test specimen, a reinforcing structure can be constructed. This reinforces the walls, floors, and / or ceilings of a room, thereby creating a seismic reinforcement structure that can be expected to have a high seismic reinforcement effect.

[0102] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications are possible without departing from its essence. Furthermore, even configurations not directly described in the specification and drawings that achieve the effects and functions of the present invention are included within the scope of the technical idea of ​​the present invention. Moreover, the embodiments described above and shown in each figure can be combined as long as there is no contradiction in their purpose and configuration. For example, in components with a common function, the various different forms shown throughout the first to fifth embodiments can be freely rearranged and / or combined as long as there is no contradiction.

[0103] For example, although this has been described assuming the existence of existing buildings, the seismic reinforcement structure according to the present invention can also be applied to newly constructed buildings.

[0104] Furthermore, since polyurea resin has excellent water resistance, water resistance may be added to each joint and connection point by filling them with a sealant. This added water resistance will provide protection not only against earthquakes but also against floods caused by river overflows. In addition, since polyurea resin also has excellent sound insulation properties, it can be expected to function as a sound-insulating and soundproofing structure in addition to its function as an earthquake-resistant structure. [Explanation of symbols]

[0105] 1A, 1B, 1C, 1D, 1E... Seismic reinforcement structures. 10A, 10B, 10C, 10D, 10Dα, 10Dβ, 10Eα, 10Eβ, 10Eγ, 10Eδ... Reinforcement structures. 10A-1, 10B-1, 10B-2, 10B-3, 10C-1, 10C-2, 10C-3, 10Dα-1, 10Dβ-1, 10Eα-1, 10Eα-2, 10Eα-3, 10Eβ-1, 10Eβ-2, 10Eβ-3, 10Eγ-1, 10Eγ-2, 10Eδ-1, 10Eδ-2... Reinforcement structural members.

Claims

1. It includes at least one reinforcing structure composed of at least one reinforcing structural member, At least a portion of the reinforcing structure is detachably disposed within the space formed between at least two existing structural members of a building. The aforementioned part comprises at least two contact portions that contact the structural member of the building that has been deformed by an external force, The reinforcing structural member is an earthquake-resistant reinforcement structure in which at least two of the contact portions, and part or substantially all of it, is covered with polyurea resin.

2. In the seismic reinforcement structure according to claim 1, The reinforcing structural member comprises a core made of a low-density material, and a portion or substantially all of its surface, including at least two of the contact portions, is covered with a polyurea resin.

3. In the seismic reinforcement structure according to claim 1 or 2, An earthquake-resistant reinforcement structure in which at least two of the contact portions are located such that at least a portion of the force input from the building structural member that contacts them forms a pair of opposing force components.

4. In the seismic reinforcement structure according to claim 1 or 2, An earthquake-resistant reinforcement structure comprising at least two of the reinforcing structures, each located in a different space, connected to one another at a predetermined angle.

5. In the seismic reinforcement structure described in claim 4, A seismic reinforcement structure comprising a plurality of reinforcing structures arranged in different spaces, each connected to the others to form a polyhedron.

6. In the seismic reinforcement structure according to claim 5, The aforementioned polyhedron is a hexahedron, which is an earthquake-resistant reinforcement structure.

7. A method for constructing an earthquake-resistant reinforcement structure according to claim 1 or 2, A step of measuring the size of the space formed between at least two of the structural members of the building, A step of manufacturing at least one of the reinforcing structural members based on the measured dimensions, A step of detachably fixing at least one reinforcing structure, which is composed of at least one of the manufactured reinforcing structural members, to the building structural member, Construction methods for earthquake-resistant reinforcement structures, including [specific details omitted].

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