JP5322214B2 - Foundation reinforcement method for existing wooden houses - Google Patents

Description

  In the existing wooden house, the foundation reinforcement for reinforcing the foundation strongly when the foundation is weakened due to the corrosion of the anchor bolt or the deterioration of the foundation concrete due to the passage of many years. It is about the method.

  Conventionally, when the anchor bolt that fixes the foundation supporting the pillar of the house to the foundation has been corroded or the foundation concrete has deteriorated due to an earthquake or the like over the years, the foundation is loosened. When the earthquake occurs again, there is a risk that the house will easily tilt or collapse. Therefore, for example, as described in Patent Document 1, when renovating an existing wooden house, the foundation, the foundation, and the pillar material are integrated, so that the base, pillar material, etc. on the foundation are displaced, separated, etc. Reinforcing methods have been developed to prevent this.

  Specifically, this reinforcing method is an aramid fiber sheet or carbon fiber formed in a vertically long rectangular shape narrower than the width (thickness) of the pillar material in the pillar material portion supported on the base. A reinforcing band made of a sheet is formed by fixing the reinforcing band made of a sheet across the foundation, the base, and the column material from one end of the column to the lower end of the foundation. The column material is integrally coupled to prevent the occurrence of misalignment of the foundation or the like with respect to the foundation.

JP 2008-2179 A

  However, according to the reinforcement structure as described above, one side surface of the lower end portion of the column member standing from the base and one side surface of the base portion supporting the column member are integrally fixed to one side surface of the foundation by the reinforcement band. Even if the column material on the foundation can be connected to and supported by the foundation via the reinforcement band, the column material is fixed to the foundation even if it can be seismically strengthened. If the anchor bolts are corroded over the years, or the foundation concrete is deteriorated, the support strength such as the resistance to pulling out the foundation by the anchor boulders will weaken, and the seismic strength of the foundation will decrease. In the event of an earthquake, the entire house may tilt from the base.

  Furthermore, the foundation is fixed to the foundation by fixing a part of a vertically long rectangular reinforcing band narrower than the width of the column material to a part of one side surface of the foundation supporting the column material. Therefore, the strength of fixing to the foundation of the foundation by the reinforcing band is not sufficient. For this reason, if the anchor bolts fixing the foundation to the foundation are corroded as described above, the foundation will be removed from the foundation. There is a problem that it is easy to slip and is not effective seismic reinforcement.

  In addition, when a wooden house is tilted due to an earthquake, if the tilt is corrected by lifting the foundation from the foundation by jacking up, the protruding length of the anchor bolt embedded in the foundation from the foundation will be shortened and the foundation will be shortened. Although it becomes difficult to fix the base, the base fixing means using the reinforcing band has a problem that the base cannot be firmly fixed to the foundation unless anchor bolts are used.

  The present invention has been made in view of such problems, and the object of the present invention is to anchor anchor bolts that are fixed to the foundation as a result of corrosion over time or deterioration of the foundation concrete. An object of the present invention is to provide a method for reinforcing a foundation in an existing wooden house that can firmly fix the entire foundation to the foundation at the time of renovation even if the supporting force of the bolt is reduced.

  In order to achieve the above object, the foundation reinforcing method for an existing house according to the present invention is such that, as described in claim 1, the reinforcing metal fitting for fixing the foundation is fixed to a reinforcement foundation constructed at the time of renovation instead of the existing foundation. This reinforcement is made using a reinforcing bracket formed by refracting both side plate portions downward toward the both side ends of a flat rectangular horizontal plate portion having a width and length that can cover the upper surface of the base. Cover the base part exposed between the pillars with the metal fittings, overlay the horizontal plate part on the upper surface of the base part, and suspend both side plate parts along the both side surfaces of the base part to the lower end of the base part. The bottom plate of both side plates is fixed with anchor bolts to the top surface of the reinforcing foundation formed from the soil concrete to both side walls of the foundation so that the horizontal plate portion of the reinforcing metal fitting is crimped to the base portion. Foundation Characterized by fixing the minute basis.

The invention according to claim 2 is the invention according to claim 1 , wherein the interstitial concrete and the reinforcing foundation are arranged in a lattice form with reinforcing bars on the ground between the soils surrounded by the existing foundation in the wooden house. The end of the bar is bent upward along the wall surface of the existing foundation to form a rising reinforcing bar, and the rising reinforcing bar is arranged at regular intervals in the vertical direction along the wall of the existing foundation. After the side reinforcement is formed by incorporating the reinforcing bars, the concrete is formed integrally by placing concrete with a certain thickness over the foundation wall from the ground between the soils. .

According to the first aspect of the present invention, there is provided the reinforcing metal fitting formed by refracting both side plate portions downward toward both side ends of the flat rectangular horizontal plate portion having a width and length capable of covering the upper surface of the base. Use this reinforcing metal fitting to cover the foundation part exposed between the pillars, superimpose the horizontal plate part on the upper surface of the foundation part, and make both side plate parts of the foundation part along both side surfaces of the foundation part. and vertically to the bottom, because the lower end of the side plate portions from earth floor concrete is to sticking by anchor bolts to the upper end surface of the reinforcing foundation is reclamation over both sidewall surfaces of the foundation, is fixed to base the foundation Even if the anchor bolt is corroded over the years, or the resistance to pulling out the anchor bolt is weakened due to deterioration of the foundation concrete, the base is firmly fixed on the foundation by the reinforcing bracket. It is possible to reinforce the mounting strength with respect to the foundation, and the reinforcement work of the foundation with this reinforcing bracket can be performed efficiently and reliably, and the existing foundation is also strongly reinforced by the reinforcing foundation, It is possible to obtain a foundation having earthquake resistance that is unlikely to break even if an earthquake occurs.

  And since the lower end part of the both side plates in the reinforcing metal fitting fitted on the foundation is fixed to the upper end surface of the reinforcing foundation by the anchor bolt, the mounting strength of the reinforcing metal fitting is extremely large, and the base by this reinforcing metal fitting is used. Can be more firmly fixed, and the seismic strength of the wooden house built on the foundation can be increased together with the seismic strength of the foundation. In addition, by providing the above reinforcement foundations on both sides of the existing foundation in advance, the upper end surface of the reinforcement foundation can be used as the jack installation surface when correcting the tilt of a wooden house caused by an earthquake or the like. Thus, after the inclination is corrected, the reinforcing metal fitting can be easily fixed to the upper end surface of the reinforcing foundation.

According to a second aspect of the present invention, in the method for reinforcing a foundation according to the first aspect , the interstitial concrete and the reinforcing foundation have reinforcing bars arranged in a lattice pattern on the ground between the soils surrounded by the existing foundation in the wooden house. In addition to the bar arrangement, the end of this grid-like bar arrangement is bent upward along the wall surface of the existing foundation to form a rising reinforcing bar portion, and this rising reinforcing bar portion is vertically moved along the wall surface of the existing foundation. After the side reinforcement was formed by incorporating reinforcing bars arranged at regular intervals, the concrete was built by placing concrete with a certain thickness from above the ground to the wall of the foundation. Therefore, it is possible to create a series of continuous reinforced concrete layers from the soil concrete to both sides of the existing foundation, and to firmly reinforce the existing foundation with the reinforcement foundation Can, it is possible to obtain a foundation having occurs hardly seismic destruction even earthquake.

  In addition, the existing foundation can be supported by the soil concrete via the reinforcement foundation, and the entire foundation surrounding the soil is integrated via the soil concrete. Even if a part sinks due to an earthquake, the foundation can be firmly supported by soil concrete to prevent some foundations from sinking or breaking, so that the wooden house does not tilt with the above reinforcing bracket Stable support can be performed.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a simplified vertical front view showing a foundation reinforcement structure in an existing wooden house, and FIG. 2 is a partial view showing the foundation reinforcement structure. FIG. 3 is a perspective front view, and FIG. 3 is a longitudinal front view. The existing foundation 1 is a continuous footing foundation called a cloth foundation, and is configured to transmit the load from the upper structure to the ground by the footing 1a. . On this existing foundation 1, a base 2 made of wooden timber is fixed, and pillars 3 are erected at predetermined intervals on the base 2, and a beam (not shown) laid between the pillars together with the building A shaft is constructed.

If the anchor bolt 4 that fixes the foundation 2 to the foundation 1 is corroded over the years or the bond strength with the foundation is weakened due to deterioration of the foundation concrete or the like, the foundation 2 has a reinforcing metal 5 The strength of fixing to the foundation 1 is reinforced by '. This reinforcing metal fitting 5 ' is formed by bending a metal plate having a constant thickness into a U-shape, and as shown in FIGS. 2 to 4, the upper surface of the base 2 has a desired length and a plane and a width and length that can be covered. Both side plate portions 5b and 5b are formed integrally at both side ends of the rectangular horizontal plate portion 5a and refracted at a right angle downward with respect to the horizontal plate portion 5a. The flanges 5c and 5c having a certain width are formed by refracting the lower end of the base plate outward, and the lower end flanges 5c and 5c are provided by covering only the base 2 without covering the existing foundation 1. It is constituted so that it adheres to the upper surface of reinforcement foundations 11 and 11 built at the time of renovation of foundation 1 of the above.

  Specifically, the reinforcing metal fitting 5 'is formed as a horizontal plate portion 5a having a width equal to the width of the base 2 over the entire length of the central portion in the width direction of the rectangular metal plate. Both sides of the metal plate connected to both side edges are refracted perpendicularly downward from both sides of the horizontal plate part 5a so that the side surfaces of the base 2 can be covered from the upper end to the lower end (parallel to each other). The opposite side plate portions 5b and 5b are formed, and the lower end portions of the side plate portions 5b and 5b are refracted at right angles toward the outside to form flange portions 5c and 5c having a certain width. In addition, anchor bolt insertion holes 6 are formed in the flange portions 5c, 5c at regular intervals in the length direction.

  Using this reinforcing bracket 5 ', the anchor bolt 4 fixing the foundation 2 on the existing foundation 1 is corroded over the years, and the bond strength with the foundation is weakened due to deterioration of the foundation concrete, etc. In order to reinforce the base 2 by firmly fixing the base 2 to the foundation when the fixing of the base 2 is loose, etc., the foundation 1 in the footing 1a of the foundation 1 is previously placed on both sides of the existing base 1. Reinforcement foundations 11 and 11 are constructed from the footing 1a to the upper end of the foundation 1 with the same thickness as the projecting width from the outside to the upper part of the foundation 1 and are integrated with the existing foundation 1, 11, anchor bolts 7 are embedded at the same intervals as the anchor bolt insertion holes 6 drilled in the flange portions 5c, 5c on both sides of the reinforcing metal fitting 5 '.

After that, as shown in FIGS. 1 to 3 , the reinforcing metal fitting 5 ′ is put on a predetermined length portion of the base 2 exposed between the adjacent pillars 3 and 3 erected on the base 2, The horizontal plate part 5a of the reinforcing metal fitting 5 'is overlapped with the upper surface of the base part so as to abut the lower surface thereof, and both side plate parts 5b, 5b are brought into contact with both side surfaces of the base 2 from both side ends of the base 2. Each anchor bolt insertion hole 6 drilled in the lower end flange portions 5c, 5c of the both side plate portions 5b, 5b is made to be in a state of hanging downward, and the anchor bolts 7 facing the respective insertion holes 6 are The flanges 5c and 5c are placed on the upper surfaces of the reinforcement foundations 11 and 11 while being inserted through the protruding ends from the reinforcement foundations 11 and 11.

  Next, an inclusion 8 such as a washer or packing is inserted into the protruding portion of each anchor bolt 7 and placed on the both side flange portions 5c and 5c of the reinforcing metal fitting 5 ′, and then a nut 9 is screwed into the anchor bolt 7. As a result, the reinforcing metal fitting 5 'is tightened and the base 2 is fixed on the existing foundation 1 in a pressed state. At this time, when the nut 9 screwed to the anchor bolt 7 is tightened through the inclusion 8, the both side flange portions 5c and 5c of the reinforcing metal fitting 5 'are pressed downward as described above, and the both side plate portions 5b. , 5b are drawn downward, and the horizontal plate portion 5a of the reinforcing metal fitting 5 'is strongly pressed against the upper surface of the base 2 by the acting force in the pulling direction, so that the base 2 can be firmly fixed to the foundation 1.

The length of the reinforcing metal fitting 5 'that covers the base 2 is formed so that the maximum length is substantially equal to the length dimension between the adjacent columns 3 and 3, but the base 2 is securely and firmly fixed. For this, it is desirable that at least the dimension longer than the width of the base 2, that is, the horizontal plate portion 5 a of the reinforcing metal fitting 5 ′ is formed in a rectangular shape that is long in the length direction of the base 2. When the length of the reinforcing metal fitting 5 'is longer than the length between the anchor bolt 4 that fixes the base 2 to the foundation 1 and one pillar 3, as shown in FIG. An insertion hole 10 for the anchor bolt 4 is provided in a portion corresponding to the anchor bolt 4 in FIG. Further, when the length of the reinforcing metal fitting 5 'is short, the anchor bolt insertion hole 10 is not necessarily provided in the horizontal plate portion 5a, but the anchor bolt 4 fixing the base 2 is set at the center. When fixing the length portion of the base 2, an anchor bolt insertion hole 10 may be provided.

  The height (vertical width) of both side plate portions 5b, 5b of the reinforcing metal fitting 5 'is formed to be substantially equal to the height (vertical width) of the base 2, and the flange portions 5c, 5c at the lower end thereof are reinforced as a foundation. When the anchor bolt 7 embedded in 11 and 11 is fastened with the nut 9 as described above, the horizontal plate portion 5a is configured to be crimped to the upper surface of the base 2, but from the height of the base 2 The flanges 5c and 5c are attached to the anchor bolts 7 by nuts 9 with packing or the like interposed between the flanges 5c and 5c and the upper surfaces of the reinforcing foundations 11 and 11, respectively. The flange may be screwed or formed slightly higher than the height of the base 2, and an elastic inclusion is disposed between the horizontal plate portion 5a and the upper surface of the base 2. The portions 5c and 5c may be screwed to the anchor bolt 7 with the nut 9 and are necessary. In addition, when the flange portions 5c and 5c are fastened with the nuts 9 to the anchor bolts 7 embedded in the reinforcing foundations 11 and 11, the horizontal plate portion 5a is pressed against the upper surface of the base 2. Good. The width between the opposing surfaces of the side plate portions 5b and 5b of the reinforcing foundations 11 and 11 is formed to be equal to the lateral width of the base 2 so that the side plate portions 5b and 5b are in contact with both side surfaces of the base 2. ing.

  The above-mentioned reinforcement foundations 11 and 11 built on both sides of the existing foundation 1 are constructed integrally with the soil concrete 12 and are destroyed even if an earthquake occurs by reinforcing the existing foundation 1 The foundation 1 has been remodeled into a foundation that is resistant to earthquakes, and the existing foundation 1 is also supported by the soil concrete 12 through the reinforcement foundations 11 and 11, and is further reinforced, and the foundation is supported. Even if a part of the ground is subsidized due to an earthquake, the concrete can be firmly supported by the interstitial concrete 12 to prevent some foundations from sinking or breaking, and the building will not tilt Thus, stable support can be performed. In addition, when a wooden house is tilted due to an earthquake or the like, the tilt correction work can be easily and efficiently performed by using the upper end surfaces of the reinforcing foundations 11 and 11 as the jack installation surface.

  The construction method of the reinforcing foundations 11 and 11 for reinforcing the existing foundation 1 and the interstitial concrete 12 will be described. First, reinforcing bars are arranged in a grid on the ground of the interstitial 13 surrounded by the existing foundation 1 14. At the same time, a vertical reinforcing bar portion 14a is formed by vertically bending the four end portions of the grid-like reinforcing bar 14 along the side surfaces of the concrete wall 1 of the four-side foundation 1 facing each end portion. The side bars 15 are formed by incorporating reinforcing bars at regular intervals in the vertical direction along the wall surface of the foundation 1 so as to be orthogonal to the rising reinforcing bar portion 14a.

  Note that the above-described grid-like bar arrangement 14 uses the existing soil between which the ground is exposed as it is, excavates the interstitial ground to such an extent that the upper surface of the footing 1a of the foundation 1 is exposed, and then places the bar arrangement on the ground. However, preferably, after excavating the existing soil ground to a depth that reaches slightly downward from the lower end of the footing 1a of the foundation 1 and excavating the recess that exposes the entire footing 1a of the foundation 1, In this recess, a ground improvement material made by mixing cement or mortar with a solidified material such as cement and mortar is put into this recess and tightened to harden the ground so that the thickness reaches the upper end surface of the footing 1a of the foundation 1. The grid reinforcement 14 is constructed on the improved ground 16 and the end of the grid reinforcement 14 is vertically upward from the exposed surface of the footing 1a along the side surface which is the concrete wall surface of the foundation 1 as described above. By bending Forming a rising rebar portion 14a.

  After placing the bars in this way, concrete is cast on the interstices 13 to form a concrete interstitial concrete 12 having a certain thickness made of reinforced concrete with grid-like reinforcing bars 14 embedded along the side of the foundation 1. The side reinforcement 15 is surrounded by a formwork (not shown), and concrete is placed in the formwork so that the lower end is connected to the end of the soil concrete 12 and the upper surface of the footing 1a of the foundation 1 integrally. Reinforcement foundations 11 and 11 having a constant thickness made of reinforced concrete having side reinforcements 15 embedded therein are formed.

  The construction of the reinforcing foundations 11 and 11 and the interstitial concrete 12 is performed in the same manner for each interstitial space 13 surrounded by the existing foundation 1 made of a continuous footing foundation. The reinforcing foundations 11 and 11 are provided so as to sandwich the foundation 1.

The simplified longitudinal front view which shows the reinforcement structure of the foundation in the existing wooden house. Perspective view of a portion thereof. The longitudinal front view. The perspective view of a reinforcement metal fitting.

1 Existing basics
1a Footing 2 Base 3 Pillar 4 Anchor bolt
5 ' reinforcement bracket
5a Horizontal plate
5b, 5b both side plate
5c, 5c Flange 7 Anchor bolt 9 Nut
11 Reinforcement foundation
12 Dough concrete

Claims (2)

  A method of reinforcing a base fixed on the foundation of an existing wooden house, and both side plates facing downward at both side ends of a horizontal rectangular plate having a width and length capable of covering the upper surface of the base Reinforced metal fittings formed by refracting the part, and covering the foundation part exposed between the pillars, the horizontal plate part is overlaid on the upper surface of the foundation part, and both side plate parts are the foundation part The bottom end of the base plate portion is suspended along the both side surfaces of the base plate, and the lower end portions of the both side plate portions are fixed to the upper end surface of the reinforcement foundation formed from the soil concrete to the both side walls of the foundation by anchor bolts. A method for reinforcing a base in an existing wooden house, characterized in that the horizontal plate part of the reinforcing metal fitting is crimped to the base part and fixed to the base part. The soil concrete and the reinforcement foundation are arranged in the form of a reinforcing bar in the form of a grid on the ground between the soil surrounded by the existing foundation in the wooden house, and the end of this grid-like reinforcement is placed upward along the wall surface of the existing foundation. After forming the side reinforcement by bending and forming the reinforcing bars at the fixed intervals in the vertical direction along the wall surface of the existing foundation, the side reinforcements are formed. 2. The method for reinforcing a foundation in an existing wooden house according to claim 1 , wherein the foundation is integrally formed by placing concrete of a certain thickness over the wall surface of the foundation from above the ground.

Images