JP2010150755A - Foundation reinforcing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foundation reinforcing structure capable of efficiently preventing the generation of a structural crack in a foundation. <P>SOLUTION: The foundation reinforcing structure is constituted by sticking a horizontal fiber sheet 3a whose longitudinal direction is the horizontal direction with respect to a side face 2b of a continuous footing 2 and sticking a vertical fiber sheet 3b whose longitudinal direction is the vertical direction with respect to corners of the continuous footing 2 and the side face 2b or the like of the continuous footing 2 immediately below a column 5 at an interval therebetween by overlapping it on the horizontal fiber sheet 3a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a foundation reinforcing structure for a structure, and more particularly, to a reinforcing structure for a foundation composed of an unreinforced concrete foundation, a reinforced concrete foundation that has deteriorated, such as a lack of reinforcing bars, cracks, or a solid foundation.

The foundations of recent houses are often constructed with reinforced concrete cloth foundations or solid foundations, and most of them have a predetermined strength against ground subsidence and earthquakes. This is because the Building Standards Act was amended in June 1981, and the “new earthquake resistance standard” was revised, and the walls covered with face materials such as structural plywood and plasterboard were added. The required wall length and the type and magnification of the shaft have been revised. The houses built after the revision are said to have suffered less damage due to the Great Hanshin-Awaji Earthquake. Also, in 2000, the foundation structure (cloth foundation, solid foundation, pile foundation) by the ground strength of the ground was defined by the major revision of the Building Standards Act and the enforcement of the Quality Assurance Law, and the balance calculation was calculated for the placement of the bearing walls, or Eccentricity calculation is required, and standardization is made regarding the specifications of the end of the bracing and the side of the bearing wall, the stigma and pedestal, and hole-down hardware.
However, especially in houses before June 1981, there are many cases where a fabric foundation with an unreinforced concrete structure or a foundation with few reinforcing bars has been constructed. These concrete structure fabric foundations have problems such as lack of strength due to the lack of or few reinforcing bars that bear tensile force, and structural cracks due to in-plane bending moments. It is necessary to take some reinforcement measures. It is said that.
As a reinforcing method, there is a method in which reinforced concrete is struck on the foundation of an existing unreinforced concrete structure.
In addition, a method has been proposed in which a fiber sheet in the form of a fiber material having a high tensile strength is bonded to the side surface of the foundation, and a tensile force acting on the foundation is applied to the fiber sheet to prevent structural cracks that occur in the foundation. ing. In the reinforcement method of the foundation of the existing building shown in patent document 1, the fiber sheet is adhere | attached in the desired horizontal length range from the standup | rising part on a foundation footing to a foundation top edge on both surfaces of the foundation of an unreinforced concrete structure. .
In addition, when a horizontal force such as an earthquake is applied to the structure, the anchor bolt is pulled by pulling out the column at the anchor bolt buried portion that fixes the foundation under the column by the pulling force generated at the column at the end of the bearing wall. Structural cracking is likely to occur due to shear force due to force or horizontal force. Also, partial shear failure is likely to occur around openings formed in the foundation, such as underfloor ventilation openings, and at the corners of the foundation and the corners of the foundation.
In the method for reinforcing a foundation of a building shown in Patent Document 2, a fiber sheet knitted in an oblique cross shape is bonded around an opening such as an underfloor ventilation opening or a portion where a pulling force under a pillar acts.
JP 2006-132081 A JP 2006-57433 A

However, conventional seismic reinforcement methods for unreinforced concrete foundations have the following problems.
Reinforcement by reinforced concrete reinforcement was not practical in terms of construction period and cost because the reinforcement of reinforced concrete had to be the same as or larger than the existing foundation. In addition, the load of the building is increased due to the reinforcement of the reinforced concrete, and when the ground on which the foundation is disposed is a soft ground, there is a problem that the ground may sink.
Moreover, in the method of adhering the fiber sheet from the rising part of the foundation to the top edge to the both sides of the cloth foundation of the unreinforced concrete structure shown in Patent Document 1, the entire reinforcement is the same depending on the condition of the ground and the foundation of the structure. Becomes an excessive reinforcement structure. Moreover, the method shown in Patent Document 2 is a method of reinforcing only a portion where structural cracks are likely to occur, such as around an opening, and is not a method of reinforcing the foundation as a whole.

  The present invention has been made in view of the above-described problems, and efficiently reinforces the structure according to the shape and weight of the structure, the condition of the foundation, and the ground strength of the ground without increasing the load of the foundation portion of the building. An object of the present invention is to provide a foundation reinforcing structure that can prevent structural cracks caused by shearing and bending fracture occurring in the foundation and can reinforce foundations that have already undergone structural cracking.

In order to achieve the above object, the foundation reinforcing structure according to the present invention is a foundation reinforcing structure for suppressing shear and bending fracture occurring in the foundation of the structure and improving the earthquake resistance of the foundation, and is provided on the side of the foundation. The reinforcing member is partially bonded.
In the present invention, since the reinforcing member is partially bonded to the side surface of the foundation of the structure in accordance with the desired reinforcement strength, there is no excessive reinforcement structure, and the foundation is adapted to the situation of the building and the ground. Can be reinforced.

Further, in the foundation reinforcing structure according to the present invention, the reinforcing member may be a sheet-like fiber reinforcing material, and may be bonded within the range of the top edge of the foundation rising from the ground surface on both sides of the foundation.
In the present invention, since the fiber reinforcing material is bonded to the both sides of the foundation within the range from the ground surface to the top of the foundation, the shearing force of the anchor bolt that mainly causes structural cracks near the top of the foundation. Due to in-plane bending stress due to the reaction force of ground strength as shown in Fig. 19 due to cracks due to etc. and heavy buildings (heavy roof / outer wall, snow load etc.) where a large vertical load is applied to the foundation, etc. It is possible to reinforce the foundation when cracks are likely to occur on the ground surface. Thereby, it can apply to the foundation of the two-story and the lower part of a heavy building on the hard ground to some extent, and the foundation of a one-story building of a heavy building.

Further, in the foundation reinforcing structure according to the present invention, the reinforcing member is a sheet-like fiber reinforcing material, and is within a range from the rising portion on the footing on the outer side surface of the foundation disposed on the outer periphery of the structure to the top of the foundation. It is good also as a structure adhere | attached on.
In the present invention, since the fiber reinforcing material is adhered within the range from the rising portion on the footing on the outer side surface of the foundation disposed on the outer periphery of the structure to the top of the foundation, mainly near the top of the rising portion. It is possible to reinforce the foundation on the ground, which contains many soft soil layers that are prone to structural cracks below the ground surface. This is because the foundation is prone to structural cracks where the upper or lower side of the foundation rises locally as the tensile side due to forced bending stress due to non-settlement due to insufficient local strength or imbalance in building load. Reinforce. Thereby, it can apply to the foundation of the two-story and the lower part of a light building (light roof, outer wall, a small amount of snow, etc.) on a relatively soft ground, or the foundation of a one-story building of a heavy building.

Moreover, in the foundation reinforcement structure which concerns on this invention, a reinforcement member is a sheet-like fiber reinforcement material, Comprising: It is good also as a structure adhere | attached in the range of the top end of a foundation from the ground surface of the one side surface of a foundation.
In the present invention, since the fiber reinforcing material is bonded within the range from the ground surface on one side surface of the foundation to the top edge of the foundation, reinforcement near the top edge of the foundation rising portion where structural cracking is likely to occur due to anchor bolts. It is possible to reinforce the foundation on the ground that is hard and has a low risk of uneven settlement. Thereby, it can apply to the foundation of the two-story and the bottom part of the light building on the ground which is hard to be hard and uneven settlement, and the foundation of the one-story building of the light building.

Further, in the foundation reinforcing structure according to the present invention, the reinforcing member is a sheet-like fiber reinforcing material, and is bonded within the range from the ground surface on the inner side surface of the foundation disposed on the outer periphery of the structure to the top edge of the foundation. In addition, a configuration may be adopted in which bonding is performed within a range from the rising portion on the footing on the outer side surface of the foundation to the top of the foundation.
In the present invention, fiber reinforcement is provided within the range from the ground surface on the inner side surface of the foundation disposed on the outer periphery of the structure to the top edge of the foundation and from the rising portion on the footing on the outer side surface of the foundation to the range from the top edge of the foundation. Since the materials are bonded, structural cracks are likely to occur mainly near the top edge of the foundation and below the ground surface, and a foundation that may be subject to uneven settlement can be reinforced in a relatively soft ground. This is because of the forced bending stress due to the fact that the soil strength is insufficient and continuous uneven settlement and pile landing work, the upper and lower sides of the foundation rising part as shown in FIG. Reinforce foundations that are prone to structural cracking. Accordingly, the present invention can be applied to the foundations of two-story and lower-floor parts of heavy buildings on the ground with relatively soft ground, the possibility of uneven settlement, improved pillars, and three-story foundations of relatively light buildings.

Moreover, in the basic reinforcement structure according to the present invention, the fiber reinforcement is in the form of a long sheet, and the longitudinal direction of the fiber reinforcement is horizontal, and the longitudinal direction of the fiber reinforcement is vertical. It is good also as a structure which consists of the vertical fiber reinforcement material used.
In the present invention, since the fiber reinforcement is bonded to the side surface of the foundation in the horizontal direction and the vertical direction, a structural anchor generated on the tensile side of the foundation due to an in-plane bending moment acting on the foundation, or a base anchor generated by a pulling force of the column It is possible to prevent structural cracking due to tensile failure / shear failure with bolts, shear failure such as foundation corners / entry corners, and partial bending stress due to vertical load in heavy buildings.

Further, in the basic reinforcement structure according to the present invention, the fiber reinforcement is in the form of a long sheet, and the longitudinal direction of the fiber reinforcement is horizontal, and the longitudinal direction of the fiber reinforcement is oblique. It is good also as a structure which consists of the diagonal fiber reinforcement which becomes.
In the present invention, since the fiber reinforcement is bonded horizontally and obliquely to the side of the foundation, structural cracks that occur on the tension side of the foundation due to in-plane bending moment acting on the foundation, and shear deformation of the foundation using the pile Diagonal structural cracks caused by can be prevented.

In the foundation reinforcing structure according to the present invention, the reinforcing member may be a flat bar PC plate.
In the present invention, since the reinforcing member is a PC plate, it is possible to bear a tensile force acting on the foundation and to add rigidity to the foundation, thereby preventing the foundation from being deformed and preventing structural cracks generated in the foundation.

Moreover, in the reinforcement structure of the foundation which concerns on this invention, it is good also as a structure by which the sheet-like fiber reinforcement is adhere | attached between the PC board and the side surface of the foundation.
In the present invention, the fiber reinforcement is bonded to the bonding surface between the precast concrete board and the foundation, so that the fiber reinforcement bears the tensile force acting on the foundation, and the PC board can add rigidity to the foundation. The foundation can be reinforced to prevent structural cracking due to shear and bending failure occurring in the foundation.

Further, in the foundation reinforcing structure according to the present invention, the portion where the reinforcing member is bonded to the side surface of the foundation is prone to structural cracks due to shear or bending fracture occurring in the foundation, or the ground on which the foundation or foundation on which the foundation is installed is installed. It can be selected depending on the situation.
In the present invention, it is possible to perform basic reinforcement as necessary by selecting a portion to which the reinforcing member is bonded.

According to the present invention, since the reinforcing material is partially bonded to the side surface of the foundation of the structure, the foundation can be reinforced in accordance with the required strength, and the shear and bending fracture occurring in the foundation can be prevented and the earthquake resistance can be improved. Can be realized.
In addition, earthquake resistance can be improved even for foundations on which structural cracks have already occurred.

Hereinafter, the basic reinforcement structure according to the first embodiment of the present invention will be described with reference to FIGS. 1 (a), (b), and (c).
FIG. 1A is a view showing an example of a basic reinforcing structure according to the first embodiment of the present invention, FIG. 1B is a sectional view of the basic reinforcing structure shown in FIG. 1A, and FIG. 1C is shown in FIG. It is a side view of a foundation reinforcement structure.

As shown in FIGS. 1 (a), (b), and (c), the foundation reinforcing structure 1a according to the first embodiment is an unreinforced concrete structure or both sides 2b of the fabric foundation 2 due to insufficient reinforcement. The long fiber sheet 3 of the fiber reinforcing material is bonded so that the longitudinal direction of the fiber sheet 3 is horizontal from the ground G surface to the top end 2a of the fabric foundation 2, and the longitudinal direction of the fiber sheet 3 Is adhered with a predetermined interval so that the vertical direction is in the vertical direction.
The cloth base 2 has a substantially T-shaped cross section with a footing 2c, and a base 4 and a pillar 5 are disposed on the top, and a wall material and a floor material (not shown) are disposed above the base. It is installed.

The fiber sheet 3 is, for example, a fiber having a high tensile strength such as an aramid fiber or carbon fiber formed in a long sheet shape. Besides, a chemical fiber such as glass fiber, vinylon fiber, acrylic fiber, nylon fiber, A fiber in which these fibers are appropriately combined may be formed into a sheet shape, or a sheet formed by combining these fibers and metal fibers may be used. The width of the fiber sheet 3 is about 1/3 of the length from the ground G surface to the top end 2a of the fabric foundation 2. The fiber sheet 3 is attached to the side surface 2b of the fabric base 2 so that the longitudinal direction is horizontal, depending on the direction in which the fiber sheet 3 is applied, and is applied to the side surface 2b of the fabric base 2 so that the longitudinal direction is vertical. The thing is referred to as a vertical fiber sheet 3b.
The lateral fiber sheet 3a is bonded by a bonding method described later in three steps without a gap from the ground G surface of the both side surfaces 2b of the fabric foundation 2 to the top end 2a of the fabric foundation 2. The vertical fiber sheet 3b is bonded in the vertical direction from the ground G surface to the top end 2a of the fabric foundation 2 to the corner portion of the fabric foundation 2 and the side surface 2b of the fabric foundation 2 immediately below where the pillar 5 is erected. At this time, prior to the vertical fiber sheet 3b, the horizontal fiber sheet 3a is bonded to the side surface of the fabric base 2, and the vertical fiber sheet 3b is stacked and bonded on top of the horizontal fiber sheet 3b. Reinforcement strength of the overlapping part increases.

As a method for bonding the fiber sheet 3, first, the side surface 2b of the fabric base 2 is cleaned, and when the finish of the side surface 2b is a mortar finish, the mortar is peeled off and removed. Then, for example, sanding is performed on the adhesive surface of the fiber sheet 3 on the side surface 2b to remove surface latency, mud, oil, and the like to ensure smoothness of the adhesive surface. If a structural crack has occurred on the side surface 2b at this point, an epoxy resin, for example, is injected into the cracked portion to repair the crack.
Then, a primer for base treatment is applied to the bonding surface, and after the primer is dried, an adhesive for undercoating is applied to bond the fiber sheet 3. Furthermore, an adhesive for overcoating is applied onto the fiber sheet 3, and tension is applied with, for example, a spatula to allow the adhesive to penetrate into the fiber sheet 3. If necessary, apply silica sand before curing the top coat adhesive, apply mortar finish to improve the adhesion of the mortar, and apply the finished mortar.

Next, the effect of the foundation reinforcement structure 1a by 1st embodiment mentioned above is demonstrated using drawing.
Since the fiber sheet 3 is formed of fibers having high tensile strength, the fiber sheet 3 is bonded to and integrated with the cloth base 2 having a low tensile strength such as a non-reinforced concrete structure, thereby acting on the cloth base 2. It exerts an effect of bearing stress and preventing structural cracks due to in-plane bending moment generated on the side surface 2b of the fabric foundation 2. Furthermore, since the vertical fiber sheet 3b is bonded to the side surface 2b of the fabric base 2 directly below the column 5 in the vertical direction, the tensile force caused by pulling out with the horizontal force of the column 5 acting on the fabric foundation 2 A shearing force under a vertical load can be borne, and structural cracks that occur on the side surface 2b of the fabric foundation 2 can be prevented.
In addition, since the fiber sheet 3 is bonded from the ground G surface of the both side surfaces 2b of the fabric foundation 2 to the top end 2a of the fabric foundation 2, it is difficult to reinforce the fabric foundation 2 by excavating the ground G surface. Even in this case, both side surfaces 2b of the fabric foundation 2 can be reinforced.

  In the foundation reinforcing structure 1a according to the first embodiment described above, since the transverse fiber sheet 3a and the longitudinal fiber sheet 3b bear the tensile stress and shearing force acting on the fabric foundation 2, the in-plane bending moment and the column horizontal force It is possible to prevent structural cracks generated in the fabric foundation 2 due to the tensile force due to pulling out at the shearing force, the shearing force due to the vertical load, the shearing force at the corner of the foundation and the corner of the foundation, and the like.

Next, the second embodiment will be described with reference to the accompanying drawings, but the same or similar members and parts as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. A configuration different from that of the embodiment will be described.
FIG. 2A is a view showing an example of a basic reinforcing structure according to the second embodiment of the present invention, FIG. 2B is a sectional view of the basic reinforcing structure shown in FIG. 2A, and FIG. 2C is shown in FIG. It is a side view of a foundation reinforcement structure.

As shown in FIGS. 2A, 2B, and 2C, in the foundation reinforcing structure 1b according to the second embodiment, the top edge 2a of the fabric foundation 2 from the ground G surface of the both side surfaces 2b of the fabric foundation 2 is obtained. The other fiber sheet 3 is bonded in a zigzag shape with a V-shape from above the horizontal fiber sheet 3a bonded in three steps. Here, the fiber sheet 3 that is bonded in a zigzag shape with a V-shape is used as the oblique fiber sheet 3c, and the lower end portion of the oblique fiber sheet 3c may be bonded to the side surface 2b of the cloth foundation 2 below the ground G surface. .
The horizontal fiber sheet 3a is bonded to the side surface 2b of the fabric base 2 as in the first embodiment, and the oblique fiber sheet 3c is bonded from above the horizontal fiber sheet 3a.

Next, the effect of the foundation reinforcement structure 1b by 2nd embodiment mentioned above is demonstrated using drawing.
The foundation reinforcing structure 1b according to the second embodiment has an effect of preventing structural cracks generated on the side face 2b of the fabric foundation 2 due to the in-plane bending moment, similarly to the foundation reinforcing structure 1b according to the first embodiment. And since the diagonal fiber sheet 3c is adhere | attached in the zigzag shape which accumulated V shape, the shear deformation of the fabric foundation 2 can be prevented efficiently, and the side surface 2b of the fabric foundation 2 by the shear deformation of the fabric foundation 2 Diagonal structural cracks that occur can also be prevented.

Next, the third embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted. A configuration different from the form will be described.
FIG. 3A is a view showing an example of a basic reinforcing structure according to the third embodiment of the present invention, FIG. 3B is a sectional view of the basic reinforcing structure shown in FIG. 3A, and FIG. 3C is shown in FIG. It is a side view of a foundation reinforcement structure.

As shown in FIGS. 3 (a), 3 (b), and 3 (c), the foundation reinforcing structure 1c according to the third embodiment lies laterally on the outer side surface 2b of the fabric foundation 2 disposed on the outer periphery of the structure. It is the structure which adhere | attaches the fiber sheet 3a and the vertical fiber sheet 3b.
The lateral fiber sheet 3a is bonded to the side surface 2b of the fabric foundation 2 in three steps from the ground G surface to the top end 2a of the fabric foundation 2, and the lower end portion of the lateral fiber sheet 3a is footed to the fabric foundation 2 below the ground G surface. One step is bonded to the upper rising portion 2d. The vertical fiber sheet 3 b is bonded to the corner portion of the fabric foundation 2 from the rising portion 2 d on the footing of the fabric foundation 2 to the top end 2 a of the fabric foundation 2.

Next, the effect of the foundation reinforcement structure 1c by 3rd embodiment mentioned above is demonstrated using drawing.
The foundation reinforcing structure 1c according to the third embodiment has an effect of preventing structural cracks generated on the side face 2b of the fabric foundation 2 due to the in-plane bending moment, similarly to the foundation reinforcing structure 1b according to the first embodiment. Further, since the fiber sheet 3 is bonded to the ground G surface, the side surface 2b of the fabric foundation 2 below the ground G surface can be reinforced. Moreover, it is suitable when reinforcing the outer side surface 2b of the fabric foundation 2 on the outer periphery of the structure.

Next, the fourth embodiment will be described with reference to the accompanying drawings, but the same or similar members and parts as those of the above-described embodiments will be denoted by the same reference numerals, and the description thereof will be omitted. A configuration different from the form will be described.
FIG. 4A is a view showing an example of a basic reinforcing structure according to the fourth embodiment of the present invention, FIG. 4B is a sectional view of the basic reinforcing structure shown in FIG. 4A, and FIG. 4C is shown in FIG. It is a side view of a foundation reinforcement structure.

  As shown in FIGS. 4A, 4B, and 4C, the foundation reinforcing structure 1d according to the fourth embodiment includes the transverse fiber sheet 3a and the longitudinal fibers of the foundation reinforcing structure 1a according to the first embodiment. The sheet 3b is configured to be bonded only to the outer side surface 2b of the fabric foundation 2 disposed on the outer periphery of the structure.

Next, the function and effect of the foundation reinforcing structure 1d according to the above-described fourth embodiment will be described with reference to the drawings.
In the foundation reinforcing structure 1d according to the fourth embodiment, there is an effect of preventing structural cracks generated on the outer side surface 2b of the fabric foundation 2 due to the in-plane bending moment acting on the fabric foundation 2. Since the fiber sheet 3 is bonded only to the outer side surface 2b of the fabric foundation 2, in-plane bending is performed on the outer side surface 2b of the fabric foundation 2 as compared with the case where the reinforcement is performed by the foundation reinforcing structure 1a according to the first embodiment. Since structural cracking due to moment is likely to occur and the strength required by the structure of the fabric foundation 2 and the ground strength of the ground is low, the amount of adhesion of the fiber sheet 3 is reduced. Installation labor and cost can be reduced.

Next, a fifth embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted. A configuration different from the form will be described.
FIG. 5A is a view showing an example of a basic reinforcing structure according to a fifth embodiment of the present invention, FIG. 5B is a sectional view of the basic reinforcing structure shown in FIG. 5A, and FIG. 5C is shown in FIG. It is a side view of a foundation reinforcement structure.

  As shown in FIGS. 5 (a), 5 (b), and 5 (c), the basic reinforcing structure 1e according to the fifth embodiment includes a transverse fiber sheet 3a and a longitudinal fiber sheet 3b arranged on the outer periphery of the structure. The structure which adhere | attaches from the standup | rising part 2d on the footing of the fabric foundation 2 of the outer side surface 2b of the fabric foundation 2 to the foundation top end 2a, and the ground G surface of the inner side surface 2b to the top end 2a of the fabric foundation 2 It is.

Next, the effect of the foundation reinforcement structure 1e by 5th embodiment mentioned above is demonstrated using drawing.
In the foundation reinforcing structure 1e according to the fifth embodiment, the structural crack generated on the side surface 2b of the fabric foundation 2 by the in-plane bending moment acting on the cloth foundation 2 is the same as the foundation reinforcing structure 1a according to the first embodiment. Has the effect of preventing. And since the fiber sheet 3 is adhere | attached also on the ground G surface to the side surface 2b of the outer side of the fabric foundation 2, the fabric foundation 2 can be reinforced strongly compared with the foundation reinforcement structure by each embodiment mentioned above. Further, the vertical fiber sheet 36 at the corner portion serves as a shear reinforcement for the protruding corner portion and the entering corner portion of the foundation.

Next, the sixth embodiment will be described with reference to the accompanying drawings. The same or similar members and parts as those of the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted. A configuration different from the form will be described.
FIG. 6A is a view showing an example of a basic reinforcing structure according to the sixth embodiment of the present invention, FIG. 6B is a sectional view of the basic reinforcing structure shown in FIG. 6A, and FIG. 6C is shown in FIG. It is a side view of a foundation reinforcement structure.

As shown in FIGS. 6A, 6B, and 6C, the foundation reinforcing structure 1f according to the sixth embodiment is precast on the outer side surface 2b of the fabric foundation 2 installed on the outer periphery of the structure. This is a structure in which a concrete reinforcing plate (hereinafter referred to as PC plate 11) is bonded.
The PC board 11 is manufactured in advance in a factory or the like, and is a flat bar member with a predetermined bar arrangement, and is installed on the outer side surface 2b of the fabric foundation 2 with the horizontal direction as the axial direction. Concave and convex joint portions 11a are provided at both ends of the PC board 11, and can be connected in accordance with the required horizontal length. The PC board 11 is installed on the side surface 2b of the fabric foundation 2 in two upper and lower stages, the upper PC board 11 is installed with its upper end aligned with the top end 2a of the cloth foundation 2, and the lower PC board 11 is installed at its lower end. Is installed together with the ground G surface.

  As for the fixing method of the PC board 11, first, the smoothness of the surface of the side surface 2b of the fabric foundation 2 is ensured similarly to the foundation reinforcing structure according to each of the above-described embodiments, and repair is performed on the cracked portion. And the insertion port of the post-construction anchor 12 for fixing the PC board 11 to the side surface 2b of the fabric foundation 2 is formed at a predetermined location. Adhesive is applied to the installation position of the PC board 11 on the side surface 2b of the fabric foundation 2, and the adhesive is inserted into the insertion port of the post-construction anchor 12, and the PC board 11 is attached to the adhesion position and temporarily fixed. After the construction anchor 12 is inserted and the adhesive applied to the side surface 2b is cured, the construction anchor 12 is fastened from above the PC plate 11 by a washer, a spring washer and a nut (not shown). Although not shown, the PC board 11 can be attached to the PC board installation position using a fiber sheet and an adhesive. If necessary, the side surface 2b of the fabric base 2 and the surface of the PC plate 11 are mortar-finished or painted with high weather resistance.

Next, functions and effects of the foundation reinforcing structure 1f according to the sixth embodiment will be described with reference to the drawings.
In the foundation reinforcing structure 1f according to the sixth embodiment, since the PC board 11 is fastened to the cloth foundation 2 by the post-construction anchor 12, the cloth foundation 2 can be rigid, There exists an effect which prevents the deformation | transformation by shear and prevents the structural crack produced in the side surface 2b of the fabric base 2. FIG.

Next, the seventh embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted. A configuration different from the form will be described.
FIG. 7A is a view showing an example of a basic reinforcing structure according to the seventh embodiment of the present invention, FIG. 7B is a sectional view of the basic reinforcing structure shown in FIG. 7A, and FIG. 7C is shown in FIG. The side view of a foundation reinforcement structure, (d) is a figure which shows the detail of the steel pipe cotter with which the foundation reinforcement structure shown to (a) is equipped.

  As shown in FIG. 7, in the foundation reinforcing structure 1g according to the seventh embodiment, the fiber sheet 3 is attached to the side surface 2b of the fabric foundation 2 to which the PC board 11 of the foundation reinforcing structure 1f according to the sixth embodiment is fixed. The PC plate 11 is bonded and fixed by a steel pipe cotter 15 in which a plurality of small-diameter holes are formed instead of the post-construction anchor 12.

As for the installation method of the PC board 11 and the fiber sheet 3, first, the slot 16 for installing the steel pipe cotter 15 is provided at a predetermined location on the side surface 2b of the fabric base 2 having a smooth surface as in the sixth embodiment. Provide. The PC plate 11 is provided with a hole 17 through which the steel pipe cotter 15 is inserted.
And the fiber sheet 3 is adhere | attached on the part by which the PC board is installed in the side surface 2b of the fabric foundation 2, and a fast curing epoxy resin is apply | coated on this fiber sheet 3, and the PC board 11 is adhere | attached. Then, a fast-curing epoxy resin is injected into the groove 16 and the hole 17 of the PC plate 11 and the steel pipe cotter 15 is inserted. Further, an adhesive is injected into the steel pipe cotter 15, a cap 18 adapted to the inner diameter of the steel pipe cotter 15 is pushed in, pressure is applied to the adhesive, and the steel pipe cotter 15 and the cloth are inserted through the small-diameter holes 15 a formed in the steel pipe cotter 15. Fill the gap between the foundation 2 and the PC board 11 with an adhesive.

  In the foundation reinforcing structure 1g according to the seventh embodiment, the PC board 11 is integrally fastened to the cloth foundation 2 with a wide bonding area by the steel pipe cotter 15 and the quick-curing epoxy resin, and the rigidity of the cloth foundation 2 is further increased. Since the fiber sheet 3 can bear the tensile force acting on the fabric foundation 2, the structural cracks generated on the side surface 2b of the fabric foundation 2 are more efficient than the foundation reinforcing structure 1f according to the sixth embodiment. It has the effect of preventing.

Next, modifications of the first embodiment will be described with reference to the accompanying drawings, but the same or similar members and parts as those of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. A configuration different from that of the first embodiment will be described.
As shown in FIG. 8, in the foundation reinforcing structure 1h, the horizontal fiber sheet 3a is bonded in three stages from the ground G surface to the top end 2a of the fabric foundation 2, and the vertical fiber sheet 3b is bonded only to the corner. In addition, as shown in FIG. 9, in the foundation reinforcing structure 1i, the transverse fiber sheet 3a is composed of two stages, one stage where the upper end is aligned with the top end 2a of the fabric foundation 2, and one stage where the lower end is aligned with the ground G surface. The two-stage horizontal fiber sheets 3a are spaced apart, and the vertical fiber sheets 3b are bonded only to the corner portions. Further, as shown in FIG. 10, in the foundation reinforcing structure 1j, the transverse fiber sheet 3a is one level of the transverse fiber sheet 3a whose upper end is aligned with the top end 2a of the cloth foundation 2, and the longitudinal fiber sheet 3b is bonded only to the corner portion. Has been.

Next, modifications of the second embodiment will be described with reference to the accompanying drawings, but the same or similar members and parts as those of the above-described second embodiment will be denoted by the same reference numerals, and description thereof will be omitted. A configuration different from the second embodiment will be described.
In the foundation reinforcement structure 1k shown in FIG. 11, the lateral fiber sheet 3a and the oblique fiber sheet 3c of the foundation reinforcement structure 1b according to the second embodiment are only applied to the outer side surface 2b of the fabric foundation 2 disposed on the outer periphery of the structure. Adhere.

Next, modifications of the third embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the third embodiment described above are denoted by the same reference numerals, and description thereof is omitted. A configuration different from the third embodiment will be described.
The basic reinforcing structures 11 and 1m shown in FIGS. 12 and 13 are obtained by changing the number of steps of the lateral fiber sheet 3a bonded to the ground G surface of the basic reinforcing structure 1c according to the third embodiment. In the structure 1l, the transverse fiber sheet 3a is composed of two stages, one stage with the upper end aligned with the top end 2a of the fabric foundation 2 and one stage with the lower end aligned with the ground G surface, and the top end of the fabric foundation 2 with the foundation reinforcing structure 1m. It is set as 1 step | paragraph of the horizontal fiber sheet 3a which match | combined the upper end with 2a.

Next, a modified example of the fourth embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described fourth embodiment are denoted by the same reference numerals and description thereof is omitted. A configuration different from the fourth embodiment will be described.
In the basic reinforcing structure 1n shown in FIG. 14, the vertical fiber sheet 3b of the basic reinforcing structure 1d according to the fourth embodiment is bonded only to the corner portion. In the basic reinforcing structures 1o and 1p shown in FIGS. 15 and 16, the vertical fiber sheet 3b of the basic reinforcing structure 1d according to the fourth embodiment is bonded only to the corner portion, and the number of steps of the horizontal fiber sheet 3a is changed. In the foundation reinforcing structure 1n, the transverse fiber sheet 3a is composed of two stages, one stage with the upper end aligned with the top end 2a of the cloth foundation 2 and one stage with the lower end aligned with the ground G surface. The vertical fiber sheet 3a having the upper end aligned with the top end 2a is a single step.

Next, modifications of the sixth and seventh embodiments will be described with reference to the accompanying drawings. The same reference numerals are used for members and parts that are the same as or similar to those of the sixth and seventh embodiments described above. Description is omitted, and a configuration different from the sixth and seventh embodiments will be described.
17 and 18, the base reinforcement structures 1q and 1r shown in FIGS. 17 and 18 are one-stage PC plates 11 provided in the foundation reinforcement structures 1f and 1g according to the sixth and seventh embodiments.
In this way, the reinforcement method can be selected according to the location conditions such as the foundation and building conditions and the ground.

As mentioned above, although embodiment of the basic reinforcement structure by this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning.
For example, in the embodiment described above, the fabric foundation 2 including the footing is reinforced, but the fabric foundation not including the footing may be reinforced, or the solid foundation may be reinforced instead of the fabric foundation 2. Good. In the first embodiment, the horizontal fiber sheet 3a and the vertical fiber sheet 3b are overlapped and bonded to each other, but may be bonded to each other without overlapping. In the embodiment described above, the vertical fiber sheet 3a is bonded to the corner portion of the fabric foundation 2 or the side surface 2b of the fabric foundation 2 directly below the pillar 5, but is bonded to the side surface 2b of the other fabric foundation 2. May be.
Further, in the fourth embodiment and the modification according to the fourth embodiment, the fiber sheet 3 is bonded only to the outer side surface 2b of the fabric base 2 disposed on the outer periphery of the structure. If necessary, it may be bonded only to the inner side surface 2b of the fabric base 2.
Further, in the sixth embodiment and the modification according to the sixth embodiment, the PC plate 11 is fixed to the fabric foundation 2 by a post-construction anchor, but may be fixed by a steel pipe cotter 15 or the like.
Moreover, in the modification by 7th Embodiment and 7th Embodiment, although the PC board 11 is being fixed to the fabric foundation 2 with the steel pipe cotter 15, you may fix with post-construction anchor etc.
Further, in the seventh embodiment, the fiber sheet 3 is bonded between the PC board 11 and the side surface 2b of the fabric base 2, but the fiber sheet 3 is bonded to a wider area than the bonding surface of the PC board 11. Alternatively, the fiber sheet 3 may be partially bonded to a range narrower than the bonding surface of the PC board 11.
In short, it is only necessary to obtain the desired function in the present invention.

(A) is a figure which shows an example of the basic reinforcement structure by 1st embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is the basic reinforcement shown to (a) It is a side view of a structure. (A) is a figure which shows an example of the basic reinforcement structure by 2nd embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is the basic reinforcement shown to (a) It is a side view of a structure. (A) is a figure which shows an example of the basic reinforcement structure by 3rd embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is the basic reinforcement shown to (a) It is a side view of a structure. ( (A) is a figure which shows an example of the basic reinforcement structure by 4th embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is the basic reinforcement shown to (a) It is a side view of a structure. (A) is a figure which shows an example of the basic reinforcement structure by 5th embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is the basic reinforcement shown to (a) It is a side view of a structure. (A) is a figure which shows an example of the basic reinforcement structure by 6th embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is the basic reinforcement shown to (a) It is a side view of a structure. (A) is a figure which shows an example of the basic reinforcement structure by 7th embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is the basic reinforcement shown to (a) The side view of a structure, (d) is a figure which shows the detail of the cotter with which the basic reinforcement structure shown to (a) is equipped. (A) is a figure which shows the modification of the foundation reinforcement structure by 1st embodiment of this invention, (b) is sectional drawing of the foundation reinforcement structure shown to (a), (c) is the foundation shown to (a). It is a side view of a reinforcement structure. (A) is a figure which shows the other modification of the basic reinforcement structure by 1st embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is (a). It is a side view of the foundation reinforcement structure shown. (A) is a figure which shows the further another modification of the foundation reinforcement structure by 1st embodiment of this invention, (b) is sectional drawing of the foundation reinforcement structure shown to (a), (c) is (a). It is a side view of the foundation reinforcement structure shown in FIG. (A) is a figure which shows the modification of the foundation reinforcement structure by 2nd embodiment of this invention, (b) is sectional drawing of the foundation reinforcement structure shown to (a), (c) is the foundation shown to (a) It is a side view of a reinforcement structure. (A) is a figure which shows the modification of the basic reinforcement structure by 3rd embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is the foundation shown to (a) It is a side view of a reinforcement structure. (A) is a figure which shows the other modification of the foundation reinforcement structure by 3rd embodiment of this invention, (b) is sectional drawing of the foundation reinforcement structure shown to (a), (c) is (a). It is a side view of the foundation reinforcement structure shown. (A) is a figure which shows the modification of the basic reinforcement structure by 4th embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is the foundation shown to (a) It is a side view of a reinforcement structure. (A) is a figure which shows the other modification of the foundation reinforcement structure by 4th embodiment of this invention, (b) is sectional drawing of the foundation reinforcement structure shown to (a), (c) is (a). It is a side view of the foundation reinforcement structure shown. (A) is a figure which shows the further another modification of the foundation reinforcement structure by 4th embodiment of this invention, (b) is sectional drawing of the foundation reinforcement structure shown to (a), (c) is (a). It is a side view of the foundation reinforcement structure shown in FIG. (A) is a figure which shows the modification of the basic reinforcement structure by 6th embodiment of this invention, (b) is sectional drawing of the basic reinforcement structure shown to (a), (c) is the foundation shown to (a) It is a side view of a reinforcement structure. (A) is a figure which shows the modification of the foundation reinforcement structure by 7th embodiment of this invention, (b) is sectional drawing of the foundation reinforcement structure shown to (a), (c) is the foundation shown to (a) It is a side view of a reinforcement structure. It is a basic stress figure in the case of ground strength 30KN / m < ² > or more. It is a foundation stress diagram in the case of a bearing capacity 20KN / m ² or less in the support piles strength.

Explanation of symbols

1a Foundation reinforcement structure 2 Fabric foundation (foundation)
2a Top end 2b Side surface 2d Rising part 3 Fiber sheet (fiber reinforcing material)
3a Horizontal fiber sheet 3b Vertical fiber sheet 3c Diagonal fiber sheet 11 PC board

Claims (10)

A foundation reinforcement structure for suppressing the shear and bending fracture of the foundation of the structure and improving the earthquake resistance of the foundation,
A foundation reinforcing structure, wherein a reinforcing member is partially bonded to a side surface of the foundation.   The foundation reinforcing structure according to claim 1, wherein the reinforcing member is a sheet-like fiber reinforcing material, and is bonded within a range from a ground surface on both sides of the foundation to a top end of the foundation. .   The reinforcing member is a sheet-like fiber reinforcing material, and is bonded within a range from a rising portion to a top end of an outer side surface of the foundation disposed on an outer periphery of the structure. The basic reinforcement structure according to 1.   The foundation reinforcing structure according to claim 1, wherein the reinforcing member is a sheet-like fiber reinforcing material, and is bonded within a range from a ground surface on one side surface of the foundation to a top end of the foundation. .   The reinforcing member is a sheet-like fiber reinforcing material, and is bonded within the range of the top surface of the foundation from the ground surface of the inner side surface of the foundation disposed on the outer periphery of the structure. The foundation reinforcing structure according to claim 1, wherein the foundation reinforcing structure is bonded within a range from the rising portion of the outer side surface to the top end.   The fiber reinforcing material is in the form of a long sheet, and includes a horizontal fiber reinforcing material in which the longitudinal direction of the fiber reinforcing material is a horizontal direction, and a vertical fiber reinforcing material in which the longitudinal direction of the fiber reinforcing material is a vertical direction. The foundation reinforcing structure according to any one of claims 2 to 5, wherein:   The fiber reinforcing material is in the form of a long sheet, and includes a horizontal fiber reinforcing material in which the longitudinal direction of the fiber reinforcing material is a horizontal direction, and an oblique fiber reinforcing material in which the longitudinal direction of the fiber reinforcing material is an oblique direction. The foundation reinforcing structure according to any one of claims 2 to 5, wherein   The foundation reinforcing structure according to claim 1, wherein the reinforcing member is a PC plate of a flat bar.   The foundation reinforcing structure according to claim 8, wherein a sheet-like fiber reinforcing material is bonded between the PC plate and the side surface of the foundation.   The foundation reinforcing structure according to claim 1, wherein a portion where the reinforcing member is bonded to the side surface of the foundation can be selected depending on a situation of the foundation or the ground on which the foundation is installed.

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