JP4903746B2 - Foundation opening reinforcement hardware - Google Patents

Description

  The present invention relates to a foundation opening reinforcement hardware, and more particularly, to a foundation opening reinforcement hardware for reinforcing an opening provided in a concrete foundation of a wooden building.

  In a wooden building, a construction method is generally used in which a wooden base is laid on a concrete foundation placed on the spot, and the base is fastened to the concrete base with a fastener such as an anchor bolt. And a pillar material is installed on a foundation and a framework is formed.

  FIG. 7 shows an example of a general opening provided in a concrete foundation of a building. The concrete foundation 2 is laid so as to surround the outer periphery of the building, and is further laid in the building to receive the pillar material 34 provided in the building. In some cases, the concrete foundation 2 is provided with an opening 4 in a part of the concrete foundation 2 after it is struck in the field in order to pass piping and wiring in the facility construction or for termite control work. In this case, a part of the placed concrete is pulled by a tool such as a drill. Inside the concrete foundation 2, reinforcing bars 33 are arranged vertically and horizontally in order to reinforce concrete which is strong in compressive force and weak in tensile force. Accordingly, the reinforcing bars 33 arranged in the opening 4 are also cut at the same time, so that the proof stress as the concrete foundation 2 is significantly reduced.

  When a wooden building receives an external force such as an earthquake, the horizontal force applied to the building may cause the base to rise from the concrete foundation together with the pillar material, and the building may collapse. Moreover, there exists a possibility that a foundation and a concrete foundation may shift | deviate by the shear force added to a building. Therefore, sufficient foundation reinforcement must be applied to the openings of concrete foundations whose yield strength has been significantly reduced.

  On the other hand, Patent Document 1 discloses a concrete building repair method. Here, a repair method is described in which, after the opening is formed, the reinforcing frame is fixed to the reinforcing bar exposed inside the opening, and the concrete material is supplied and fixed around the reinforcing frame.

JP 2004-239007 A

  In a wooden building that receives an external force such as an earthquake, stress concentrates on the opening provided by cutting the reinforcing bars in the concrete foundation, and there is a seismic problem that the foundation rises from the concrete foundation together with the pillar material and the building collapses. In addition, there is a seismic problem that the foundation and the concrete foundation are displaced due to the shearing force applied to the building.

  Also, the opening of the concrete foundation has to be reinforced because the rebar is cut and the structure is discontinuous, but the opening is generally opened after completion of the wooden building, There are many restrictions on the construction of opening reinforcement and it is not easy. Furthermore, it is not easy to solve both of the two seismic problems and the opening reinforcement.

  The purpose of the present application is to solve the above problems, to reinforce the opening provided in the concrete foundation, to connect the concrete foundation to the foundation, and to provide a foundation opening reinforcement hardware that simply reinforces the foundation and the concrete foundation. That is.

  In order to achieve the above object, a foundation opening reinforcement hardware according to the present invention is an upper horizontal plate fastened to a base at the top of an opening in a foundation opening reinforcement hardware for reinforcing an opening provided in a concrete foundation of a building. And an upper vertical plate that is connected to both ends of the upper horizontal plate and surrounds a part of the side of the opening, an upper reinforcing plate that forms a U-shape, and a lower horizontal that is fastened to the concrete foundation at the lower portion of the opening A plate, a lower vertical plate that is connected to both ends of the lower horizontal plate and surrounds a part of the opening side, a lower reinforcing plate that forms a U-shape, and an upper overlapping portion that is superimposed on the upper vertical plate And a pair of side reinforcing plates that connect the upper vertical plate and the lower vertical plate so as to surround the opening, and a side portion. The reinforcing plate is connected to the upper side plate in the upper overlapping part along the side of the opening. Is fastened to Ried basis, characterized in that it is fastened to the concrete foundation of the opening side together with the lower longitudinal plate at portions superposed lower.

  With this structure, the foundation opening reinforcement hardware completely surrounds the periphery of the opening provided in the concrete foundation by connecting four plate members, an upper reinforcement plate, a lower reinforcement plate, and a pair of side reinforcement plates. can do. Thereby, the opening part provided in the concrete foundation can be reinforced. Moreover, a foundation opening part reinforcement metal part fastens an upper reinforcement board to the base of an upper part of an opening part, and fastens a lower reinforcement board to the concrete foundation of an opening part lower part. Thereby, a foundation and a concrete foundation can be tied together and it can be used as foundation reinforcement at the time of an earthquake.

  Further, the upper reinforcing plate and the lower reinforcing plate are connected to each other by a side reinforcing plate at each overlapping portion. In other words, since the corner where the bending moment that occurs at the upper and lower reinforcing plates at the time of the earthquake is maximized is removed and the bending moment is connected at a relatively small position, the foundation reinforcement hardware with high structural safety is obtained. be able to.

  Further, the base opening reinforcing hardware has a first fitting portion in which the side reinforcing plate protrudes convexly toward the upper and lower vertical plates in the upper and lower overlapping portions, and the upper and It is preferable to fit in the connection hole provided in the position which a lower vertical board opposes.

  With this configuration, the first fitting portion protruding in a convex shape is fitted into the connection hole portion, and a part of the shearing force generated in the side reinforcing plate and the upper reinforcing plate or the lower reinforcing plate can be borne. . Thereby, it becomes reinforcement of the shear strength of a fastening bolt, and it can be set as a foundation reinforcement hardware with high structural safety.

  Further, the base opening reinforcing metal fitting has a second fitting portion in which the upper and lower vertical plates each protrude in a convex shape toward the side reinforcing plate in the overlapping portion, and are overlapped. It is preferable to be fitted in a third fitting portion that is provided at a position facing each other and protrudes in a convex shape in a direction opposite to the base.

  With this configuration, the second and third fitting portions protruding in a convex shape are mated and fitted, and a part of the shearing force generated between the side reinforcing plate and the upper reinforcing plate or the lower reinforcing plate can be borne. it can. Thereby, it becomes reinforcement of the shear strength of a fastening bolt, and it can be set as a foundation reinforcement hardware with high structural safety.

  The base opening reinforcing hardware has a first reinforcing portion in which the upper reinforcing plate protrudes in a convex shape in the opposite direction to the base at the corner portion where the upper horizontal plate and the upper vertical plate are connected. It is preferable that the reinforcing plate has a first reinforcing portion that protrudes in a convex shape toward a direction opposite to the concrete foundation at a corner portion to which the lower horizontal plate and the lower vertical plate are connected.

  With this configuration, the bending of the plate surface, as will be described later, by the first reinforcing portion protruding in a convex shape at the corner portion where the bending moment in the plate surface of the upper reinforcing plate and the lower reinforcing plate is maximized in the event of an earthquake. Stiffness can be increased. Thereby, it can be set as a foundation reinforcement metal with high structural safety with respect to the bending moment which generate | occur | produces in a foundation opening part reinforcement metal.

  The foundation opening reinforcing hardware has a second reinforcing portion in which the upper reinforcing plate protrudes in a convex shape toward the opposite direction to the base around the bolt hole for fastening to the base, and the lower reinforcing plate is It is preferable to have a second reinforcing portion that protrudes in a convex shape in the direction opposite to the concrete foundation around the bolt hole for fastening to the concrete foundation.

  With this configuration, as described later, the bending rigidity of the plate material around the fastener can be increased by the second reinforcing portion protruding in a convex shape. Thereby, it can be set as a foundation reinforcement metal with high structural safety with respect to the bending moment which generate | occur | produces in a foundation opening part reinforcement metal.

  Further, in the foundation opening reinforcing hardware, the side reinforcing plates have folded portions facing the concrete foundation at both longitudinal ends, and the folded portions are both longitudinal ends of the overlapping portions of the upper and lower vertical plates. It is preferable to fit the part.

  With this configuration, the bending rigidity of the side reinforcing plate can be increased in the overlapping portion. Thereby, it can be set as a foundation reinforcement metal with high structural safety with respect to the bending moment which generate | occur | produces in a foundation opening part reinforcement metal.

  As described above, according to the foundation opening reinforcement hardware according to the present invention, the opening provided in the concrete foundation is reinforced, the concrete foundation and the foundation are tightly connected, and the foundation and the concrete foundation are simply reinforced. Is possible.

  Hereinafter, embodiments of the foundation opening reinforcing hardware according to the present invention will be described in detail with reference to the drawings.

(Overall structure of foundation opening reinforcement hardware)
In FIG. 1, the schematic structure of one embodiment of a foundation opening reinforcement metal fitting is shown with a perspective view. FIG. 2 shows a front view of the basic opening portion reinforcing hardware 1 of FIG. The foundation opening reinforcement hardware 1 has an opening 4 in which an upper reinforcement plate 5, a lower reinforcement plate 6, and two side reinforcement plates 13 are provided in the lower part of the base 3 and penetrate through the concrete foundation 2. The upper part, the lower part and the side part are surrounded. The upper reinforcing plate 5 is connected to both ends of the upper horizontal plate 7 and the upper horizontal plate 7 fastened to the base 3 on the upper portion of the opening 4 by fastening bolts 25 and surrounds a part of the side of the opening 4. It is composed of a vertical plate 8. The upper reinforcing plate 5 is provided with a fastening hole 14 for a fastening bolt 25. The upper reinforcing plate 5 forms a U-shape that opens downward as a whole.

  The lower reinforcing plate 6 is connected to the lower horizontal plate 9 fastened to the concrete foundation 2 below the opening 4 by fastening bolts 26 and both ends of the lower horizontal plate 9 so as to surround a part of the side of the opening 4. It consists of a lower vertical plate 10. The lower reinforcing plate 6 is provided with a fastening hole 16 for a fastening bolt 26. The lower reinforcing plate 6 forms a U-shape that opens upward as a whole. The upper part refers to the direction of the base 3 with respect to the opening 4, and the lower part refers to the direction of the concrete foundation 2 with respect to the opening 4.

  The side reinforcing plate 13 includes an upper overlapping portion 11 that is overlapped with the upper vertical plate 8 and a lower overlapping portion 12 that is overlapped with the lower vertical plate 10. And the side part reinforcement board 13 connects the upper vertical board 8 and the lower vertical board 10 so that the opening part 4 may be surrounded. As a result, the opening 4 is surrounded by the connected upper reinforcing plate 5, lower reinforcing plate 6, and two side reinforcing plates 13. The side reinforcing plate 13 is fastened to the concrete foundation 2 on the side of the opening 4 together with the upper vertical plate 8 in the upper overlapping portion 11 by fastening bolts 27. Further, the lower overlapping portion 12 is fastened together with the lower vertical plate 10 to the concrete foundation 2 on the side of the opening 4 by fastening bolts 27. As a result, the left and right side reinforcing plates 13 bind the base 3 and the concrete foundation 2 together. The side reinforcing plate 13, the upper vertical plate 8 and the lower vertical plate 10 are provided with fastening holes 15 for fastening bolts 27.

(Stress generated in foundation opening reinforcement hardware)
FIG. 3 shows a modeled stress generated in the foundation opening reinforcement hardware 1 when a horizontal force is applied to the building during an earthquake. In this model, it is assumed that the column 34 is attached directly above the opening 4 to which the foundation opening reinforcement hardware 1 is attached. This is because the foundation opening reinforcement hardware 1 is assumed to receive the most severe stress. The foundation opening reinforcement hardware 1 is fixed to the base 3 at three upper fixing points 28a, 28b, and 28c. Further, it is fixed to the concrete foundation 2 by three lower fixing points 29a, 29b, 29c and four side fixing points 30a, 30b.

  FIG. 3 (a) shows a bending moment distribution generated in the foundation opening reinforcement hardware 1 when the pulling force (F) is generated in the column member 34 due to the earthquake motion. Since the base 3 has the opening 4 below, it is assumed that the base 3 receives a bending moment as a beam having both ends fixed. That is, most of the pulling force (F) is concentrated on the upper fixing point 28b and a moment (M1) is generated. Further, in the vicinity of the upper fixing points 28a and 28c, since the fixing degree is high, a bending moment (M2) is generated. The reaction force of the drawing force (F) is generated at the lower fixing points 29a, 29b, 29c and the side fixing points 30a, 30b. This reaction force is distributed to the fixed points 29 and 30 and transmitted to the concrete foundation 2. Therefore, it is assumed that a very large bending moment is not generated in the portion other than the above of the base opening portion reinforcing hardware 1, and the bending moment diagram is omitted.

  FIG. 3 (b) shows a bending moment distribution generated in the foundation opening reinforcement hardware 1 when a horizontal force (S) is generated in the column member 34 due to the earthquake motion. In this case, since the base 3 and the concrete foundation 2 tend to be displaced from each other, a bending moment distribution as shown in FIG. 3B is assumed. In this case, the maximum bending moment (M3) due to the shearing force is generated in the vicinity of the upper fixing points 28a and 28c and the lower fixing points 29a and 29c.

  From the bending moment distribution generated in the assumed foundation opening reinforcement hardware 1 described above, the connection between the upper horizontal plate 7 and the upper vertical plate 8 of the upper reinforcing plate 5 and the lower horizontal plate 9 and the lower portion of the lower reinforcing plate 6 It is clear that a large stress is generated at the connection portion with the vertical plate 10, that is, at the upper corner portion 17 and the lower corner portion 18 of the foundation opening reinforcing metal 1. The foundation opening reinforcement hardware 1 of the present invention is configured to assemble four parts, an upper reinforcement plate 5, a lower reinforcement plate 6, and two side reinforcement plates 13, thereby producing the foundation opening reinforcement hardware 1. And facilitates transportation. However, the four parts are not joined at the upper corner portion 17 and the lower corner portion 18 of the base opening portion reinforcing metal 1, and the upper reinforcing plate 5 and the lower reinforcing plate 6 are formed in a U shape, and the side portions are reinforced. The joint portion with the plate 13 is removed from the upper corner portion 17 and the lower corner portion 18. Thereby, it is set as the foundation opening reinforcement hardware 1 with higher earthquake-proof safety.

(Reinforcing means to improve seismic safety)
From the bending moment distribution generated in the assumed foundation opening reinforcement hardware 1 described above, the fastening bolt 25 for fastening the upper reinforcing plate 5 to the base 3, the fastening bolt 26 for fastening the lower reinforcing plate 6 to the concrete foundation 2, and the upper part It is apparent that a large shearing force is generated in the fastening bolts 27 for fastening the reinforcing plate 5 or the lower reinforcing plate 6 and the side reinforcing plate 13 to the concrete foundation 2. Below, the reinforcement means of the corner | angular parts 17 and 18 and the fastening bolts 25, 26, and 27 which improve seismic safety is demonstrated.

  FIG. 4 shows reinforcing means in the corner portion 17 of the upper reinforcing plate 5 and the overlapping portion 11 of the upper vertical plate 8 and the side reinforcing plate 13. In FIG. 4, the upper corner portion 17 and the upper overlapping portion 11 will be described, but the same applies to the lower corner portion 18 and the lower overlapping portion 12. 4A is a plan view of the upper corner portion 17 and the upper overlapping portion 11, and FIG. 4B is a cross-sectional view taken along line AA of FIG. 4A. The side reinforcing plate 13 has a first fitting portion 20 that protrudes in a convex shape toward the upper vertical plate 8 in the upper overlapping portion 11. Moreover, the connection hole part 19 which the 1st fitting part 20 fits is provided in the position which opposes the 1st fitting part 20 of the upper vertical board 8 overlapped. When the side reinforcing plate 13 is overlapped from above the upper vertical plate 8, the first fitting portion 20 is inserted into the connection hole portion 19 to be fitted. Further, a fastening hole 15 is provided in the vicinity of a position where the first fitting portion 20 and the connection hole portion 19 are fitted, and the first fitting portion 20 and the connection hole portion 19 are fastened by a fastening bolt 27. As a result, the first fitting portion 20 is prevented from being detached from the connection hole portion 19. Thus, the first fitting portion 20 and the connection hole portion 19 are fitted to the vertical and left and right shearing forces generated in the overlapping portion 11 of the upper vertical plate 8 and the side reinforcing plate 13. The fastening bolt 27 is reinforced.

  As shown in FIG. 4, the upper vertical plate 8 has a second fitting portion 21 that protrudes in a convex shape toward the side reinforcing plate 13 in the overlapping portion 11. Moreover, the 3rd fitting part 22 which protrudes in the convex shape toward the opposite direction to the base 3 is provided in the position which the side part reinforcement board 13 to pile up opposes. The fitting portion 21 has a shape that is superimposed from above. Therefore, when the side reinforcing plate 13 is overlaid from above the upper vertical plate 8, the third fitting portion 22 covers and fits over the second fitting portion 21. Thus, the fastening bolt is formed by fitting the third fitting portion 22 and the second fitting portion 21 against the shearing force in the left-right direction generated in the overlapping portion 11 of the upper vertical plate 8 and the side reinforcing plate 13. 25 and the fastening bolt 27 are reinforced.

  As shown in FIG. 4, the upper reinforcing plate 5 has a first reinforcing portion 23 that protrudes in a convex shape in the opposite direction to the base 3 at the corner 17 where the upper horizontal plate 7 and the upper vertical plate 8 are connected. . That is, a width is given to the cross section of the plate material at the corner portion 17 where a large bending moment is generated. From this, the section modulus of the upper horizontal plate 7 at the corner portion 17 is increased, and the allowable bending moment is increased. Thereby, the upper horizontal plate 7 of the upper reinforcing plate 5 is reinforced with respect to the bending moment generated in the corner portion 17.

  FIG. 5 shows a reinforcing means for the fastening bolt 25 near the center of the upper reinforcing plate 5. Fig.5 (a) shows the top view of the center vicinity of the upper reinforcement board 5, FIG.5 (b) shows the BB cross section of Fig.5 (a). In FIG. 5, the upper reinforcing plate 5 will be described, but the same applies to the lower reinforcing plate 6. In the vicinity of the bolt hole 14 for the fastening bolt 25 to the base 3, a second reinforcing portion 24 that protrudes in a convex shape toward the opposite direction to the base 3 is provided. The second reinforcing portion 24 is provided so as to surround the washer 31 used for the fastening bolt 25. Thereby, the second reinforcing portion 24 reinforces the fastening bolt 25 against a shearing force generated near the center of the upper reinforcing plate 5. Further, the upper lateral plate 7 of the upper reinforcing plate 5 is reinforced with respect to a bending moment generated near the center of the upper reinforcing plate 5.

  FIG. 6 shows a folded portion of the side reinforcing plate 13. In FIG. 6, the upper vertical plate 8 and the upper portion of the side reinforcing plate 13 will be described, but the same applies to the lower vertical plate 10 and the lower portion of the side reinforcing plate 13. The side reinforcing plates 13 have folded portions 32 that are directed to the concrete foundation 2 at both longitudinal ends, and the folded portions 32 are fitted to both longitudinal ends of the overlapping portion 11 with the upper vertical plate 8. . Thereby, the fastening bolt 27 is mainly reinforced against the shearing force in the left-right direction generated in the overlapping portion 11 of the upper vertical plate 8 and the side reinforcing plate 13.

  The fastening holes 15 of the side reinforcing plate 13 shown in FIGS. 1 and 2 are elongated in the vertical direction, and the connection hole 19 is longer than the vertical length of the first fitting portion 20. Thereby, the foundation opening reinforcement metal fitting 1 can be expanded and contracted in the vertical direction, and an error in construction accuracy of the opening 4 can be absorbed. This is because the fastening holes 14, 15, 16 of the upper reinforcing plate 5 and the lower reinforcing plate 6 shown in FIGS. 1 and 2 are elongated in the vertical direction, and the connection hole portion 19 of the first fitting portion 20. It is also possible to make the hole longer than the length in the vertical direction.

It is a perspective view showing a schematic structure of one embodiment of a foundation opening reinforcement metal hardware concerning the present invention. It is a front view of the foundation opening part reinforcement metal fitting of FIG. It is explanatory drawing which models and shows the stress distribution which generate | occur | produces in a foundation opening reinforcement hardware when horizontal force, such as at the time of an earthquake, is added to a building. It is the front view and sectional drawing which show the reinforcement means in the corner | angular part of an upper reinforcement board, and the overlap part of an upper vertical board and a side part reinforcement board. It is a front view which shows the reinforcement means of the fastening bolt of the center of an upper reinforcement board. It is a perspective view which shows the folding | turning part of a side part reinforcement board. It is a perspective view which shows one Example of the general opening part provided in the concrete foundation of a building.

Explanation of symbols

  1 Foundation opening reinforcement hardware 2 Concrete foundation 3 Base 4 Opening 5 Upper reinforcement plate 6 Lower reinforcement plate 7 Upper horizontal plate 8 Upper vertical plate 9 Lower horizontal plate 10 Lower vertical plate 11 Upper Superposed portion, 12 Lower superposed portion, 13 Side reinforcing plate, 14, 15, 16 Fastening hole, 17 Upper corner portion, 18 Lower corner portion, 19 Connection hole portion, 20 First fitting portion, 21 2 fitting part, 22 3rd fitting part, 23 1st reinforcement part, 24 2nd reinforcement part, 25, 26, 27 Fastening bolt, 28 Upper fixing point, 29 Lower fixing point, 30 Side fixing point, 31 Washer , 32 Folding part, 33 Reinforcing bar, 34 Column material.

Claims (6)

In the foundation opening reinforcement hardware that reinforces the opening provided in the concrete foundation of the building,
An upper reinforcing plate that is connected to both ends of the upper horizontal plate and surrounds a part of the side of the opening, and an upper reinforcing plate that forms a U-shape;
A lower reinforcing plate, which is connected to both ends of the lower horizontal plate and surrounds a part of the side of the opening, and forms a U-shape. ,
A pair of upper overlapping portions that are overlapped with the upper vertical plate and lower overlapping portions that are overlapped with the lower vertical plate, and connecting the upper vertical plate and the lower vertical plate so as to surround the opening. A side reinforcing plate,
The side reinforcement plate is fastened to the concrete foundation on the side of the opening together with the upper vertical plate in the upper overlapping portion, and is fastened to the concrete foundation on the side of the opening together with the lower vertical plate in the lower overlapping portion. Foundation opening reinforcement hardware.   It is a basic opening part reinforcement metal fitting of Claim 1, Comprising: A side part reinforcement board has the 1st fitting part which protrudes in a convex shape toward an upper part and a lower vertical board in an upper part and a lower overlap part. A base opening reinforcing metal fitting, which is fitted into a connecting hole provided at an opposing position of the upper and lower vertical plates to be overlaid.   It is a foundation opening part reinforcement metal object of Claim 1 or 2, Comprising: An upper part and a lower vertical board each have a 2nd fitting part which protrudes in a convex shape toward a side part reinforcement board in an overlapping part. A base opening reinforcing metal fitting, which is provided at a position where the superimposed side reinforcing plates face each other, and is fitted into a third fitting portion protruding in a convex shape in the direction opposite to the base.   It is a foundation opening part reinforcement metal fitting of any one of Claims 1 thru | or 3, Comprising: An upper reinforcement board is convex toward the opposite direction to a base in the corner | angular part which an upper horizontal board and an upper vertical board connect. The lower reinforcing plate has a first reinforcing portion that protrudes in a convex shape toward the opposite direction to the concrete foundation at a corner portion where the lower horizontal plate and the lower vertical plate are connected. A foundation opening reinforcement hardware characterized by that.   5. The foundation opening reinforcing hardware according to claim 1, wherein the upper reinforcing plate protrudes in a convex shape in a direction opposite to the base around the bolt hole for fastening to the base. The lower reinforcing plate has a second reinforcing portion that protrudes in a convex shape in the direction opposite to the concrete foundation around the bolt hole for fastening to the concrete foundation. Foundation opening reinforcement hardware.   It is a foundation opening part reinforcement metal piece of any one of Claims 1 thru | or 5, Comprising: A side part reinforcement board has a folding | returning part which goes to a concrete foundation in the both ends of a vertical direction, respectively, A folding | returning part is upper part and A base opening reinforcing metal fitting that is fitted to both ends in the vertical direction of the overlapping portion of the lower vertical plate.

Images