JP2013076255A - Foundation reinforcement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation reinforcement structure which not only enables "construction with residents living there" including an environment, noises and the like but also enables an existing foundation to be reinforced by simply and reliably fixing a reinforcing plate to a foundation beam part on a narrow site.SOLUTION: In a foundation reinforcement structure, a plurality of reinforcing plates 4 having a truss structure are arranged in the longitudinal direction of a side surface 11a of an existing foundation 1; anchor bodies 5 are inserted into anchor insertion holes which are formed on the side surface 11a of the existing foundation 1 via attachment holes provided at least at four corners of each of the reinforcing plates 4; the anchor bodies 5 are fixed in the anchor insertion holes with an adhesive; and the reinforcing plates 4 are fixed to the existing foundation 1 by means of the anchor bodies 5 and nuts.

Description

  The present invention relates to a building foundation, and more particularly to a foundation reinforcing structure that can simply and reliably reinforce a foundation of an existing building inferior in earthquake resistance.

  Currently, there are many wooden buildings built before the new earthquake resistance standards. Buildings before the new earthquake resistance standard were designed according to the Building Standard Law at the time, so the foundations of unreinforced concrete were often used, and after that the Great Hanshin-Awaji Earthquake and others suffered enormous damage. It has been reported. A method of filling a concrete crack caused by an earthquake or the like with concrete and repairing it has also been taken, but even if the cracked part is reinforced with concrete, an increase in yield strength cannot be expected. Therefore, the Building Standards Act was reviewed according to the earthquake damage situation, and standards for seismic performance, such as arranging a predetermined amount of reinforcing bars, were raised. Various methods have also been proposed for reinforcing existing foundations.

  For example, in Patent Document 1, a plurality of long thin metal plates are connected in a belt-like manner in two upper and lower stages at predetermined intervals on one or both side surfaces of a cloth foundation or a solid foundation made of unreinforced concrete. In addition, the joint portion has a double structure, and the thin metal plate is fixed using a hard edge anchor which is a high-strength screw fixing type anchor as a post-installed anchor as shown in FIG. A foundation reinforcement structure has been proposed.

JP 2010-053607 A

  However, the above-mentioned basic reinforcement structure described in Patent Document 1 connects a plurality of long thin metal plates in a band shape, and the joint portion has a double structure, and the connection portion of the thin metal plates Since it is fixed using a construction anchor after the screw fixing type, the anchor portion is pin-supported and the metal thin plate may rotate. For this reason, the connected thin metal plates do not work together and move apart, and the resistance force in the out-of-plane direction is weakened. Is inadequate.

  In addition, in the conventional foundation reinforcing structure described in Patent Document 1, since a mechanical screw-fixed anchor is used as a post-construction anchor as shown in FIG. 6, when the concrete strength of the existing foundation is low On the other hand, when the concrete strength of the existing foundation is high, there is a problem that the thread of the screw-fixed anchor is damaged and is not easily caught in the anchor insertion hole, and the fixing force is likely to be reduced. Further, mechanical screw-fixed anchors have a problem that the backlash of the anchor insertion hole is larger than that of the adhesive anchors, and the stress is difficult to disperse evenly with respect to the foundation.

  Therefore, the present invention is not limited to renovation work while living, so-called "construction while living", taking into account environmental measures such as dust, vibration, noise, etc. It aims at providing the foundation reinforcement structure which can be reinforced.

In order to achieve the above object, the basic reinforcing structure of the invention according to claim 1 of the present application has a truss structure, and a plurality of reinforcing plates provided with attachment holes at least at four corners along the longitudinal direction of the side surface of the basic beam portion. The anchor body and nut inserted in parallel through the mounting holes of the reinforcing plates are filled with adhesive in the anchor insertion holes of the foundation beam provided at positions corresponding to the mounting holes of the plurality of reinforcing plates. A plurality of reinforcing plates are fixed to the foundation beam portion by the above. Thereby, since it becomes simple construction which only drives in a construction anchor after an adhesion system, it can ensure uniform performance regardless of the level of an operator. In addition, noise and dust generated during construction are only when an anchor insertion hole is opened on the side of the foundation beam, so noise generation can be reduced as much as possible. Is possible. In addition, since at least four corners of a plurality of reinforcing plates having a truss structure are fixed to the side surfaces of the foundation beam portion by anchor bodies and nuts, these reinforcing plates do not move apart, and are integrated into a resistance in the out-of-plane direction. Since the force increases, the existing foundation can be reinforced easily and reliably in a narrow area.
Further, the basic reinforcing structure of the invention according to claim 2 of the present application is the basic reinforcing structure according to claim 1, wherein the plurality of reinforcing plates are respectively an upper chord portion extending in a parallel separation state in a longitudinal direction of the basic beam portion, and A truss structure is formed by the lower chord part and the diagonal member part connecting them in an inclined manner, the lower end part is embedded in the foundation beam part, and the base or column is projected at the upper end part protruding on the foundation beam part. The diagonal member is arranged so as to be orthogonal to a cone-shaped fracture line assumed for a foundation beam portion of a fixed hardware to be fixed. As a result, the diagonal part of each reinforcing plate is orthogonal to the cone-shaped fracture line of a fixed hardware such as an anchor bolt or a hole-down hardware that fixes the base or column, so when a tensile force acts on the fixed metal, The cone-shaped fracture of the foundation beam can be effectively suppressed.

  In the foundation reinforcing structure of the present invention, a plurality of reinforcing plates each having a truss structure are arranged along the longitudinal direction of the side surface of the foundation beam portion, and at least four corners of each reinforcing plate are fixed by an adhesive post-work anchor. As a result, it is possible to reduce the generation of noise and dust as much as possible, and it is possible to easily and reliably reinforce existing foundations even in narrow spaces as well as “construction while living”.

It is a figure which shows the foundation reinforcement structure of Embodiment 1 which concerns on this invention. It is an expanded sectional view of the B section in FIG. 3 is a diagram illustrating an example of a reinforcing plate according to Embodiment 1. FIG. 6 is a diagram illustrating another example of the reinforcing plate of Embodiment 1. FIG. It is a figure which shows the foundation reinforcement structure of Embodiment 2 which concerns on this invention. It is a figure which shows the example of the reinforcement board of Embodiment 2, its connection state, etc. It is a figure which shows the other example of the reinforcement board of Embodiment 2, its connection state, etc. FIG. It is a figure which shows the other example of the foundation reinforcement structure of Embodiment 2. FIG. It is a figure which shows the other example of the foundation reinforcement structure of Embodiment 2. FIG. It is a figure which shows the other example of the foundation reinforcement structure of Embodiment 2. FIG. It is a figure which shows the other example of the foundation reinforcement structure of Embodiment 2. FIG. It is a figure which shows the foundation reinforcement structure of Embodiment 3 which concerns on this invention.

Hereinafter, Embodiments 1 to 3 of the foundation reinforcing structure according to the present invention will be described with reference to the drawings.
Embodiment 1. FIG.
1A and 1B are views showing the arrangement of reinforcing plates in the foundation reinforcing structure of Embodiment 1, wherein FIG. 1A is a front view, FIG. 1B is a cross-sectional view taken along line AA, and FIG. It is an expanded sectional view of the B section in FIG. The existing foundation 1 includes a foundation beam portion 11 and a footing portion 12. In the foundation reinforcing structure of the first embodiment, a plurality of reinforcing plates 4 having a truss structure are arranged in a row so as not to overlap each other along the longitudinal direction of the side surface 11a of the foundation beam portion 11, and the post-construction anchors are bonded to each other. It is fixed. As shown in FIGS. 3 and 4 to be described later, attachment holes 4a are formed at the four corners of each reinforcing plate 4 used here, and the side surface 11a of the foundation beam portion 11 corresponds to each attachment hole 4a. Anchor insertion holes 11a1 are formed at the respective locations. Then, the anchor bodies 5 are respectively inserted into the anchor insertion holes 11a1, and the anchor bodies 5 are fixed with the adhesive 6 previously filled in the anchor insertion holes 11a1, and then the reinforcing plates 4 are fixed to the foundation beam portion 11 with nuts 72 or the like. doing. As shown in detail in FIG. 2, a capsule (not shown) containing an inorganic adhesive such as cement powder is inserted into the anchor insertion hole 11 a 1 formed in the side surface 11 a of the foundation beam portion 11. Then, the capsule is crushed by rotating and striking the anchor body 5 attached to a hammer drill or the like. The crushed capsule fragments become a part of the adhesive 6 as an aggregate, fill the anchor insertion hole 11a1, and fix the anchor body 5 by the solidified product thereof. The anchor body 5 is fixed in a state where its head protrudes from the side surface 11a of the foundation beam part 11, passes through the mounting holes 4a of the reinforcing plate 4 through the head, and is tightened by a nut 72 via a washer 71 from above. Thus, the reinforcing plate 4 can be reliably fixed to the side surface 11a of the foundation beam portion 11. In FIGS. 1A and 1B, 2 is a base and 3 is a pillar.

  The first embodiment is different from the first embodiment in that an adhesive post-installation anchor is used instead of a mechanical post-construction anchor as in the technique of Patent Document 1. This is because, in the case of mechanical post-installed anchors, not only the drilling diameter is large and the working efficiency is poor, but also a gap remains in the drilled hole after anchor placement, and it is not necessarily sufficient in terms of the anchor strength of the anchor itself. There is a problem that it is difficult and noisy. On the other hand, in the post-construction anchor after the adhesive system, no gap remains in the anchor insertion hole 11a1, so that when the shearing force is applied to the anchor body 5, the stress can be reliably transmitted. Further, when an earthquake or the like occurs, the foundation beam portion 11 is deformed not only in the plane but also in the out-of-plane direction due to vertical and horizontal seismic forces, and therefore, a tensile force and a shearing force act on the anchor body 5. In screw connection (bolt bonding) of steel plates, when a combined stress of a tensile force and a shearing force is applied, the tensile force is reduced depending on the degree of the shearing force. However, in the first embodiment, the mortarized adhesive 6 fills the periphery of the anchor body 5 and cures, whereby the degree of reduction in tensile force is greatly improved and the fixing strength is improved. Moreover, in the screw connection (bolt joint) by the post-construction anchor of the conventional mechanical type, when a plurality of holes are formed in one article to be joined, and these holes are fixed in a state where the bolt as the anchor body is penetrated, The design premise is that all bolts bear the stress equally. However, if only one of the holes competes with the bolt due to construction accuracy, stress concentration occurs in the bolt, and early breakage may occur in the stress concentration portion. However, in the first embodiment, since the adhesive 6 made of cement mortar is filled around the anchor body 5 and hardened, the reinforcing plate 4 and the anchor body 5 do not compete with each other, and stress concentration is prevented. be able to. By the way, the adhesive of the anchor body 5 includes an organic type and an inorganic type, but is not particularly limited in the present invention. In the first embodiment, an example in which an inorganic cement adhesive is used is described. In particular, the cement-based adhesive is excellent in nonflammability, heat resistance, and weather resistance, and is the same quality as the concrete of the existing foundation 1, which is advantageous for integration with the existing foundation 1. Furthermore, since it does not contain a volatile organic compound (VOC), it has excellent effects such as being friendly to the human body and the environment. Moreover, in this Embodiment 1, the hole diameter of the attachment hole 4a of each reinforcement board 4 shall be more than the outer diameter of the anchor insertion hole 11a1. As a result, the anchor body 5 can be easily passed through the mounting holes 4a of the reinforcing plates 4, and the adhesive 6 filled in the anchor insertion holes 11a1 leaks out of the anchor insertion holes 11a1 and It overflows to the mounting hole 4a and hardens. Therefore, the foundation beam 11, the reinforcing plate 4, the anchor body 5, and the like are fixed not only by tightening with the nut 72 via the washer 71 but also by the adhesive 6, and the fixing strength is improved.

  FIGS. 3A to 3D each show an example of the reinforcing plate 4, which is an example in which the outer shape is formed in a substantially square shape. That is, the reinforcing plate 4 in FIG. 3A is formed in a truss shape including an upper chord portion 41 and a lower chord portion 42 that extend in the lateral direction (horizontal direction), and one diagonal member 43 that connects them. In this example, longitudinal member portions 44 and 45 are also provided. The basic reinforcing structure shown in FIGS. 1A and 1B shows an example in which the reinforcing plate 4 shown in FIG. 3A is used, and the diagonal members 43 of the adjacent reinforcing plates 4 are alternately arranged. They are arranged to face in the opposite direction. In addition, you may arrange | position so that the diagonal materials 43 of the adjacent reinforcement board 4 may face the same direction. The reinforcing plate 4 in FIG. 3 (b) has a curved shape so that the inside and outside of the connecting portions of the upper chord portion 41, the lower chord portion 42, the diagonal member portion 43, and the vertical member portions 44 and 45 do not form corners. The reinforcing plate 4 in FIGS. 3C and 3D is provided with two diagonal members 43a and 43b, and the reinforcing plate 4 in FIG. 3C has two diagonal members 43a and 43b orthogonal to each other. The reinforcing plate 4 in FIG. 3D is an example in which two diagonal members 43a and 43b are orthogonal to each other.

  4 (a) to 4 (d) show other examples of the reinforcing plate 4, respectively. The lateral length from the reinforcing plate 4 of FIGS. 3 (a) to 3 (d), that is, the upper chord portion 41 and FIG. In the example in which the length of the lower chord part 42 is almost doubled, six attachment holes 4a are provided. That is, the reinforcing plate 4 in FIG. 4A has four diagonal members 43a to 43d that connect the upper chord part 41 and the lower chord part 42 extending in the horizontal direction (horizontal direction) and the upper chord part 41 and the lower chord part 42. The diagonal members 43a and 43b and the diagonal members 43c and 43d are orthogonal to each other. The reinforcing plate 4 in FIG. 4B is obtained by adding three vertical member portions 44 to 46 to the reinforcing plate 4 in FIG. The reinforcing plate 4 in FIG. 4C is an example in which the diagonal members 43b and 43c and the central vertical member 45 are omitted from the reinforcing plate 4 in FIG. 4B. The reinforcing plate 4 in FIG. 4D is an example in which the diagonal members 43b and 43c are omitted from the reinforcing plate 4 in FIG. In addition, when arrange | positioning the some reinforcement board 4 in the longitudinal direction of the side surface 11a of the foundation beam part 11, the reinforcement board 4 shown to FIG. 3 (a)-(d) and FIG. 4 (a)-(d) is used. Only one type may be used, or they may be appropriately selected and arranged in combination.

  Therefore, according to the foundation reinforcing structure of the first embodiment, the plurality of reinforcing plates 4 having the truss structure are arranged in the longitudinal direction of the side surface 11a of the foundation beam portion 11, and at least four corners of each reinforcing plate 4 are attached to the adhesive system. Because it is fixed with construction anchors, it enables "construction while staying" including the environment and noise. Further, the long thin metal plate does not move apart like the foundation reinforcing structure described in Patent Document 1 described above, and the resistance force in the out-of-plane direction is increased. Can be reinforced. That is, in this basic reinforcement structure, since it is a simple construction in which the construction anchor is driven after the adhesive system, a uniform performance can be ensured regardless of the level of the operator. Moreover, since the noise generated at the time of construction is only required when the anchor insertion hole 11a1 is opened on the side surface 11a of the foundation beam portion 11, the generation of noise can be reduced as much as possible.

Embodiment 2. FIG.
FIGS. 5A and 5B are diagrams showing the arrangement of reinforcing plates in the basic reinforcing structure of Embodiment 2, wherein FIG. 5A is a front view and FIG. 5B is a cross-sectional view taken along the line CC. The basic reinforcing structure of the second embodiment is characterized in that the vertical member portions 44 and the vertical member portions 45 of the adjacent reinforcing plates 4 are arranged so as to overlap each other. Therefore, the height of at least one of the vertical member portion 44 and the vertical member portion 45 of each reinforcing plate 4 is changed so that each reinforcing plate 4 is as close as possible to the side surface 11 a of the foundation beam portion 11.

  6A and 6B are diagrams showing the reinforcing plate 4 according to the second embodiment, in which FIG. 6A is a plan view, FIG. 6B is a sectional view taken along the line DD, and FIG. 6C is a sectional view showing a connected state thereof. Each reinforcing plate 4 is configured such that the left vertical member 44 protrudes to the near side by the thickness of the reinforcing plate 4 from the right vertical member 45 by bending or the like. Therefore, when the vertical member portion 44 of the right reinforcing plate 4 is placed on the vertical member portion 45 of the adjacent left reinforcing plate 4 while aligning the mounting holes 4a, the upper chord portion of each adjacent reinforcing plate 4 is disposed. 41, the lower chord part 42, the diagonal part 43 and the vertical part 45 are arranged in close contact with the side surface 11a of the foundation beam part 11. On the contrary, the right vertical member 45 may be configured to be higher than the left vertical member 44 by the thickness of the reinforcing plate 4. In addition, the reinforcement board 4 arrange | positioned at a right end uses what was shown to Fig.3 (a).

  7A and 7B are diagrams showing another example of the reinforcing plate 4 according to the second embodiment, in which FIG. 7A is a plan view, FIG. 7B is a sectional view taken along line EE, and FIG. FIG. In this case, out of the reinforcing plates 4 arranged on the side surface 11a of the foundation beam portion 11, the vertical member portions 44 and the vertical member portions 45 on both sides of every other reinforcing plate 4 except for the reinforcing plates 4 at both ends are replaced with the upper chord portion. 41, the lower chord part 42, etc. are configured to be higher by the thickness of the reinforcing plate 4, and such reinforcing plates 4 are arranged and bonded to the flat reinforcing plate 4 as shown in FIGS. It is connected by a construction anchor after the system. Therefore, even in this case, when the upper chord part 41 and the lower chord part 42 of each adjacent reinforcing plate 4 are arranged so as to overlap each other, the upper chord part 41, the lower chord part 42, the diagonal member 43, etc. It will be placed in close contact with the side surface 11a of the part 11.

  Therefore, according to the basic reinforcing structure of the second embodiment, even if the vertical member portions 44 and the vertical member portions 45 of the adjacent reinforcing plates 4 are arranged so as to overlap each other, the upper chord portion 41, the lower chord portion 42, the diagonal portion of each reinforcing plate 4 are arranged. Since the material portion 43 and the like are disposed in close contact with the side surface 11a of the foundation beam portion 11, the degree of adhesion of each reinforcing plate 4 to the side surface 11a of the foundation beam portion 11 is increased, and the side surface 11a of the foundation beam portion 11 is continuously provided. Can be suppressed. As a result, the reinforcing effect can be improved. Similarly to the first embodiment, when the hole diameter of the attachment hole 4a of each reinforcing plate 4 is equal to or larger than the outer diameter of the anchor insertion hole 11a1, the vertical member portion 44 and the vertical member portion 45 of the adjacent reinforcing plate 4 are arranged to overlap each other. As a result, the adhesive 6 filled in the anchor insertion hole 11a1 leaks out of the anchor insertion hole 11a1 and overflows to the mounting holes 4a of the two reinforcing plates 4 in which the vertical member 44 and the vertical member 45 are overlapped. Solidify. As a result, the vertical member portion 44 and the vertical member portion 45 of the two reinforcing plates 4 that are overlapped are also fixed by the adhesive 6, and the reinforcing plates 4 are more firmly connected to each other than in the first embodiment. At the same time, the number of post-installation anchor placement points is reduced, and the construction efficiency is improved as compared with the case of the first embodiment.

  In the case of the basic reinforcement structure of the second embodiment, the mounting holes 4a of the vertical member portion 44 of the left reinforcing plate 4 and the attachment holes 4a of the right vertical member portion 45 are connected to each other by a construction anchor in a state where they are overlapped. Therefore, as shown in FIGS. 8A and 8B, a long connection plate 81 that connects the base 2, the column 3, and the foundation beam portion 11, and a short length that connects the foundation 2 and the foundation beam portion 11. The connecting plate 82 may be further overlapped with the overlapping portion of the reinforcing plates 4 and fixed by a post-construction anchor. In this way, since the existing foundation 1 can be reinforced with the base 2 and the pillar 3 integrally, it becomes possible to achieve smooth stress transmission between the pillar 3, the base 2 and the existing foundation 1, and further improve the earthquake resistance. To do. Further, as shown in FIGS. 9A and 9B, the longitudinal member portion 44 on one side, for example, the left side of each reinforcing plate 4 is extended and integrated with the long connecting plate 81 and the short connecting plate 82, The long connecting plate 81 and the short connecting plate 82 can be connected to the base 2 and the pillar 3. In this way, the foundation beam portion 11 is not only reinforced by the plurality of reinforcing plates 4, but also by the base 2 and the pillar 3 through the long connecting plate 81 and the short connecting plate 82 integrated with the reinforcing plate 4. Since they are connected and integrated, smooth stress transmission can be achieved among the pillar 3, the base 2, and the existing foundation 1, and the earthquake resistance is further improved. For example, the tensile force generated in the pillar 3 is transmitted to the base 2 and the existing foundation 1 and resists the tensile force in the whole of the pillar 3, the base 2, and the existing foundation 1. 8B is a sectional view taken along line FF in FIG. 8A, and FIG. 9B is a sectional view taken along line GG in FIG. 9A. Further, as shown in FIGS. 10A and 10B, at the corner portion (protruding corner portion) where the two foundation beam portions 11 are orthogonal to each other, the corner portion (protruding corner portion) is disposed by the L-shaped metal part 83. The reinforcing plates 4 may be connected. If it does in this way, the stress concerning the reinforcement board 4 arrange | positioned at the side surface 11a of one foundation beam part 11 will be applied to the reinforcement board 4 arrange | positioned at the side surface 11a of the other foundation beam part 11 orthogonal to the foundation beam part 11. Since it becomes possible to transmit, it becomes possible to improve earthquake resistance in this respect.

  Moreover, when the diagonal member 43 of the reinforcing plate 4 is one, the direction of the diagonal member 43 of each reinforcing plate 4 is opposite to each other between the adjacent reinforcing plates 4 as shown in FIG. However, it is efficient to change the direction of the diagonal member 43 in accordance with the state of stress applied to the foundation beam portion 11. For example, as shown in FIG. 11, when the crack 11a2 has appeared in the side surface 11a of the foundation beam part 11, each reinforcement board 4 is arrange | positioned so that the diagonal part 43 may orthogonally cross with respect to the direction of the crack 11a2. This arrangement is effective in preventing the crack 11a2 from progressing. In FIG. 11, the adjacent reinforcing plates 4 are arranged so as to overlap with each other, but the adjacent reinforcing plates 4 may not be overlapped and the diagonal member 43 may be arranged so as to be orthogonal to the direction of the crack 11 a 2. Of course.

Embodiment 3. FIG.
The foundation reinforcing structure of the third embodiment is characterized in the disposition direction of the diagonal member 43 of the reinforcing plate 4 when a fixed hardware such as a hole-down hardware 91 and an anchor bolt 92 is embedded in the foundation beam 11 in advance. .

  12A and 12B are diagrams showing the basic reinforcing structure of the third embodiment. FIG. 12A shows the case where the reinforcing plate 4 shown in FIG. 6 is used, and FIG. 12B shows the reinforcing plate 4 shown in FIG. This is an example of the case where the reinforcing plate 4 configured so that the left vertical member 44 in the reinforcing plate 4 shown in (c) protrudes to the near side by the thickness of the plate from the right vertical member 45 is used. As shown in FIGS. 12A and 12B, in the foundation reinforcing structure of the third embodiment, the hole-down hardware 91 or the like is provided in advance in the base beam portion 11 in a substantially vertical direction, that is, in a direction perpendicular to the upper surface of the foundation beam portion 11. A fixed hardware such as an anchor bolt 92 is embedded, and the upper end of the hole-down hardware 91 is fixed to the pillar 3, while the upper end of the anchor bolt 92 is fixed to the base 2. The plurality of reinforcing plates 4 are arranged along the longitudinal direction of the side surface 11 a of the foundation beam portion 11, but each reinforcing plate 4 is inclined with respect to the cone-shaped fracture lines 91 a and 92 a of the hole down hardware 91 and the anchor bolt 92. It arrange | positions so that the material part 43 may orthogonally cross. The cone-shaped fracture is a cone of 45 degrees from the tip of the embedded hole-down hardware 91 and anchor bolt 92 when the hole-down hardware 91 and anchor bolt 92 embedded in the foundation beam portion 11 are subjected to a tensile force. The cone-shaped fracture line means that the conical fracture surface assumed in the foundation beam portion 11 can be expressed as a line on the surface of the side surface 11a. That is, as shown in FIGS. 12A and 12B, the tips of the hole-down hardware 91 and the anchor bolt 92 embedded in the foundation beam portion 11 protrude downward from the diagonal member 43 of the reinforcing plate 4. The reinforcing plate 4 is arranged in the longitudinal direction of the side surface 11 a of the foundation beam portion 11. When arranged in this manner, the diagonal member 43 of each reinforcing plate 4 is orthogonal to the hole-down hardware 91 and the cone-shaped fracture lines 91a, 92a of the anchor bolt 92, so that the tensile force is applied to the hole-down hardware 91 or the anchor bolt 92. When it acts, cone-like destruction can be effectively suppressed. As a result, the pull-down of the hole-down hardware 91 or the anchor bolt 92 is suppressed, and the generation of cracks due to cone-like fracture can be suppressed as much as possible. It is possible to prevent the sudden decrease in the proof stress of the existing foundation 1. In the third embodiment shown in FIG. 12, the adjacent reinforcing plates 4 are arranged so as to overlap each other as in the second embodiment, but the adjacent reinforcing plates 4 are arranged so as not to overlap each other as in the first embodiment. Of course. Moreover, also in Embodiment 3, since the several reinforcement board 4 is attached to the longitudinal direction of the side surface 11a of the foundation beam part 11 by the post-construction anchor of an inorganic adhesive system similarly to Embodiment 1, 2, the same effect is acquired. .

  DESCRIPTION OF SYMBOLS 1 ... Existing foundation, 11 ... Foundation beam part, 11a ... Side, 11a1 ... Anchor insertion hole, 12 ... Footing part, 2 ... Base, 3 ... Column, 4 ... Reinforcement plate, 4a ... Mounting hole, 41 ... Upper chord part, 42 ... Lower chord part, 43, 43a-43d ... Diagonal part, 44-46 ... Longitudinal part, 5 ... Anchor body, 6 ... Adhesive, 71 ... Washer, 72 ... Nut, 81 ... Long connecting plate, 82 ... Short Connecting plate, 91 ... Hall down hardware (fixed hardware), 92 ... Anchor bolt (fixed hardware).

Claims (2)

  A plurality of reinforcing plates having a truss structure and provided with mounting holes in at least four corners are juxtaposed along the longitudinal direction of the side surface of the foundation beam portion, and provided at positions corresponding to the mounting holes of the plurality of reinforcing plates, respectively. A foundation reinforcement structure characterized by filling an anchor insertion hole of a foundation beam portion with an adhesive and fixing a plurality of reinforcement plates to the foundation beam portion by means of anchor bodies and nuts inserted through attachment holes of the reinforcement plates. The foundation reinforcing structure according to claim 1,
Each of the plurality of reinforcing plates forms a truss structure with an upper chord part and a lower chord part extending in parallel with each other in the longitudinal direction of the foundation beam part, and an oblique member part connecting them in an inclined manner. The diagonal part is perpendicular to the cone-shaped fracture line assumed for the foundation beam part of the fixed hardware that embeds the lower end part in the part and fixes the base or the pillar at the upper end part protruding on the foundation beam part. The foundation reinforcement structure characterized by arrange | positioning so that it may do.

Images