JP5463181B2 - How to reinforce a beam before making a through hole in an existing building beam - Google Patents

Description

  The present invention relates to a method for reinforcing a beam of a reinforced concrete beam in an existing building before providing a through hole for piping.

  When renovating an existing building having a reinforced concrete beam, the beam is provided with a through hole penetrating the beam in the width direction through the side of the beam, and a water supply pipe, a drain pipe, Pipes such as gas pipes, ventilation ducts, etc. may be placed. By providing the through hole in the beam, a partial cross section of the beam is lost, so that the shear strength of the beam is significantly impaired. For this reason, it is necessary to reinforce the beam before providing the through hole in the beam.

  Conventionally, in the beam reinforcing method, there is a method in which a steel plate having an annular planar shape surrounding a perforated region where the through hole is provided in the side portion is attached to the side portion of the beam (Non-Patent Document 1). reference). When the beam receives a loading load, seismic force, etc. and a shearing force acts on the beam, the steel plate resists the shearing force. This reinforces the beam.

165th Annual Meeting of Architectural Institute of Japan (Kinki) September 1995, page 165

  However, the steel plate is relatively heavy and requires a lot of labor to carry the steel plate, making it difficult to handle the steel plate. For this reason, workability at the time of reinforcement of the beam is not good.

  An object of the present invention is to reduce the weight of a member attached to the side of the beam when reinforcing the beam before providing a through hole in the beam of an existing building, thereby facilitating the handling of the beam. It is to improve workability at the time of reinforcement.

  According to the present invention, when reinforcing the beam, a first interval is horizontally arranged in the side portion of the beam from the perforated region toward each end portion, and a second interval larger than the first interval is arranged upward. One end of the first rebar is placed at the first position, and the first position is horizontally spaced from the perforated region toward each end portion, and the second position is spaced downward by the second distance. The second end of the first reinforcing bar is second at a third position spaced apart from the perforated region upward and downward, and horizontally spaced toward the one end portion. One end of the reinforcing bar is placed at the first position spaced apart from the perforated region in the upward and downward directions, and the second reinforcing bar is in a fourth position horizontally spaced toward the other end portion. The other end of each is attached. This reduces the weight of the member attached to the side of the beam, facilitates handling of the member, and reinforces the beam compared to the conventional case where a steel plate having an annular planar shape surrounding the perforated region is attached to the side of the beam. Improve time workability.

  A beam reinforcing method according to the present invention is a reinforced concrete beam of an existing building extending in a first horizontal direction and spaced between two end portions spaced in the first horizontal direction. Perpendicular to the second horizontal direction orthogonal to the first horizontal direction, and having a top portion and a bottom portion spaced from each other, and a perforated region provided between the top portion and the bottom portion This is a method of reinforcing a beam having a side portion before providing a through hole for piping, which penetrates the beam in the second horizontal direction through the perforated region. In this reinforcing method, a first interval is set in the first horizontal direction from the perforation region toward each end portion in the side portion of the beam, and a second interval larger than the first interval is set upward. A first non-through hole that is open at the first position and extends inward in the second horizontal direction from the first position toward the end portion from the perforated region to the first horizontal position. A second non-penetrating portion that is open at the second position and extends inward in the second horizontal direction from the second position to a second position that is spaced apart by the first and spaced downward by the second distance. A first step of providing holes, respectively, and a third position spaced apart from the perforation region in the upper and lower directions and spaced in the first horizontal direction toward one end portion. Open at the third position and from the third position to the second position. A third non-through hole extending inwardly in the horizontal direction is spaced apart from the perforated region by the first interval upward and downward, and the second interval in the first horizontal direction toward the other end portion. A second step that is provided at each of the fourth positions and provided with a fourth non-through hole that is opened at the fourth position and extends inward in the second horizontal direction from the fourth position; A third step of preparing a first reinforcing bar extending in the second horizontal direction and having two parallel ends and a central portion perpendicular to each end provided between the ends; and A fourth step of inserting one end of the first reinforcing bar into the first non-through hole, the other end into the second non-through hole, and fixing each end to the inside of the beam; 1 parallel, spaced apart in the horizontal direction, each extending in the second horizontal direction And a fifth step of preparing a second rebar having a central portion perpendicular to each end provided between the end of the second rebar and the third non-penetrating end of the second rebar And a sixth step of inserting the other end into the fourth non-through hole and fixing each end to the inside of the beam. In this way, the one end and the other end of the first reinforcing bar are attached to the first position and the second position, respectively, and the one end of the second reinforcing bar is attached to the third position and the fourth position, respectively. And attaching the other end.

  When the beam receives a loading load, seismic force, or the like and a shearing force acts on the beam, each of the first reinforcing bar and the second reinforcing bar resists the shearing force. This reinforces the beam. When reinforcing the beam, the one end and the other end of the first reinforcing bar are attached to the first position and the second position, respectively, and the second reinforcing bar is attached to the third position and the fourth position, respectively. In order to attach the one end and the other end, the weight of the member attached to the side of the beam can be reduced compared to the conventional case of attaching a steel plate having an annular planar shape surrounding the perforated region to the side of the beam. And the handling of the member can be facilitated. Thereby, workability | operativity at the time of reinforcement of a beam can be improved.

  The reinforcing method includes a protrusion made of concrete or mortar having an annular planar shape protruding from the side portion to the second horizontal direction outward from the side portion after the sixth step and surrounding the perforated region. And it may include a seventh step of forming a projection covering the central portion of the first reinforcing bar and the central portion of the second reinforcing bar. Further, the reinforcing method is opened to the side portion of the beam before the first step or between the second step and the third step, outwardly in the second horizontal direction, from the first position. An eighth step of providing a first groove extending vertically in the second position and a second groove extending in the first horizontal direction from the third position to the fourth position; The central portion of one reinforcing bar is received in the first groove, and the central portion of the second reinforcing bar is received in the second groove in the sixth step, and the first step is performed after the sixth step. Each of the groove and the second groove may include a ninth step of filling a mortar filler.

  In the reinforcing method, a first interval is provided in the first horizontal direction from the perforation region to each end portion in the side portion of the beam, and a second interval larger than the first interval is provided upward. A first non-through hole that is open at the first position and extends inward in the second horizontal direction from the first position toward the end portion from the perforated region to the first horizontal position. A second non-penetrating portion that is open at the second position and extends inward in the second horizontal direction from the second position to a second position that is spaced apart by the first and spaced downward by the second distance. Each having a hole, spaced in the vertical direction, each extending in the second horizontal direction, two parallel ends and a center perpendicular to each end provided between the ends Preparing a reinforcing bar having a portion, and connecting one end of the reinforcing bar to the first non-through hole The other end is inserted into the second non-through hole, and each end can be made which includes securing to the inside of the beam.

  The reinforcing method includes a second interval that is higher than the first interval in the first horizontal direction toward the one end portion of the side portion of the beam. A first non-through hole that is open at the first position and extends inward in a second horizontal direction from the first position to the first position spaced apart from the first perforation region is provided above and below, respectively. The second position is opened at the second position and spaced from the second position in the second horizontal direction to the second position spaced apart by one and spaced in the first horizontal direction toward the other end portion. A second non-through hole extending in each direction, spaced in the first horizontal direction, each extending in the second horizontal direction and provided between two parallel ends. Prepare rebars with a central part perpendicular to each end Inserting one end of the reinforcing bar into the first non-through hole, the other end into the second non-through hole, and fixing each end to the inside of the beam. Can do.

  The reinforcing method is substantially 45 degrees with respect to the first horizontal direction from the perforated region toward each end portion in the side portion of the beam when viewed in a plane perpendicular to the second horizontal direction. The first interval is disposed in a first inclined direction that intersects at an angle, and the second interval is disposed in a second inclined direction that is perpendicular to the first inclined direction and is greater than the first interval. A first non-through hole that is open at the first position and extends inward in the second horizontal direction from the first position in the first inclined direction from the perforated region toward each end portion. A second position spaced apart and secondly spaced in the second inclined direction in the second inclined direction, opened in the second position and extending inward in the second horizontal direction from the second position. Providing non-through holes, respectively, above and below the perforation area The third position is opened to the third position spaced apart in the second inclined direction and spaced apart in the first inclined direction toward the one end portion, and the third position is opened. A third non-through hole extending inward in the second horizontal direction from the position is spaced apart in the second inclined direction from the perforation region to the upper and lower sides, and the first non-through hole toward the other end portion. Providing a fourth non-through hole that is open at the fourth position and extends inward in the second horizontal direction from the fourth position at a fourth position spaced apart by the second interval in one inclined direction; Two first ends spaced in two inclined directions, each extending in the second horizontal direction and having a central portion perpendicular to each end provided between the two end portions and the end portions; Preparing a rebar, one end of the first rebar to the first non-through hole, and the other end Are respectively inserted into the second non-through holes and each end is fixed to the inside of the beam, spaced in the first inclined direction, and each extending in the second horizontal direction, parallel to each other Preparing a second rebar having a center portion perpendicular to each end portion provided between the two end portions and the end portions; and connecting one end portion of the second rebar to the third non-through hole The other end portion may be inserted into the fourth non-through hole, and each end portion may be fixed inside the beam.

  According to the present invention, when the beam is reinforced, a first interval is provided in the first horizontal direction from the perforated region toward each end portion on the side of the beam, and the first interval is larger than the first interval upward. One end of the first reinforcing bar is placed at a first position spaced by two, the first spacing is placed in the first horizontal direction from the perforated area toward each end, and the second spacing is placed downward. The other end portion of the first reinforcing bar is placed at the second position, and the first interval is placed upward and downward from the perforation region, and the second interval in the first horizontal direction toward the one end portion. One end of the second rebar is placed at a third position where the first rebar is placed, and the first interval is placed upward and downward from the perforation region, and the second horizontal portion is directed toward the other end portion in the first horizontal direction. To attach the other end of the second rebar to the spaced fourth position respectively, on the side of the beam Compared with the conventional mounting a steel sheet having a circular planar shape surrounding the perforated area can be the weight of the member to be attached to the side of the beam, it is possible to facilitate handling of the member. Thereby, workability | operativity at the time of reinforcement of a beam can be improved.

Side view of building beams. The side view of the beam in line 2 of Drawing 1 after providing the 1st non-through hole, the 2nd non-through hole, the 3rd non-through hole, and the 4th non-through hole in the side part of a beam. The side view of the beam after inserting one end part of a 2nd reinforcing bar into the 2nd non-through hole, and the other end part into the 3rd non-through hole, respectively. FIG. 4 is a cross-sectional view of the beam along line 4 in FIG. 3. The side view of a beam after forming a protrusion in the side part of a beam. FIG. 6 is a cross-sectional view of the beam along line 6 in FIG. 5. The side view of the beam after providing the through hole in the beam. FIG. 8 is a cross-sectional view of the beam taken along line 8 in FIG. 7. The side view of the beam after providing the 1st groove | channel and the 2nd groove | channel in the side part of the beam. The side view of the beam in the state in which the center part of the 1st reinforcing bar was received in the 1st slot, and the center part of the 2nd reinforcing bar was received in the 2nd slot, respectively. FIG. 11 is a cross-sectional view of the beam along line 11 in FIG. 10. The side view of the beam after filling the filling material in each of the first groove and the second groove. FIG. 13 is a cross-sectional view of the beam along line 13 in FIG. 12. The figure which showed having attached the 1st reinforcing bar and the 2nd reinforcing bar to each side part of a beam. The figure which shows that each of a 1st reinforcing bar and a 2nd reinforcing bar consists of a some member. The figure which shows having attached the 3rd reinforcing bar and the 4th reinforcing bar to the side part of a beam. The figure which shows that the 1st position and the 2nd position are spaced apart in the 2nd inclination direction, and the 3rd position and the 4th position are spaced apart in the 1st inclination direction. The figure which shows having attached only the 1st reinforcing bar to the side part of a beam. The figure which shows having attached only the 2nd reinforcing bar to the side part of a beam. The figure which shows having reinforced the wall of the building.

  As shown in FIG. 1, there is a reinforced concrete beam 12 of an existing building 10 that extends in a first horizontal direction (left-right direction in FIG. 1). The beam 12 has a side portion 14 perpendicular to a second horizontal direction (depth direction in FIG. 1) orthogonal to the first horizontal direction, and the side portions are spaced in the first horizontal direction. Two end portions 16, 18, a top portion 20 and a bottom portion 22 spaced between the end portions, and a perforated region 24 provided between the top portion 20 and the bottom portion 22. . The beam 12 is provided between the two columns 26 spaced in the first horizontal direction, and a floor slab 28 is supported on the beam 12.

  When the building 10 is refurbished, the beam 12 is provided with a through hole 30 (FIG. 7) passing through the beam 12 in the second horizontal direction through the perforated region 24, and a water supply pipe, a drain pipe, and a gas pipe are provided in the through hole. A pipe (not shown) such as a ventilation duct is arranged. By providing the through hole 30 in the beam 12, a part of the cross section of the beam 12 is lost and the shear strength of the beam 12 is impaired. Therefore, the beam 12 is reinforced before the through hole 30 is provided in the beam 12.

  When the beam 12 is reinforced, first, as shown in FIG. 2, a first interval (in FIG. 2) in the first horizontal direction from the perforated region 24 toward each end portion 16, 18 in the side portion 14 of the beam 12. And a first non-through hole at a first position 36 that is located above the perforated region 24 and is spaced a second distance greater than the first distance (denoted by the numeral 34 in FIG. 2). 38 to a second position 40 that is spaced apart from the piercing region 24 in the first horizontal direction toward the end portions 16, 18 and spaced second from the piercing region 24. Second non-through holes 42 are provided. The first non-through hole 38 is opened at the first position 36 and extends inward in the second horizontal direction from the first position, and the second non-through hole 42 is opened at the second position 40 and the second position. Extends inward in the second horizontal direction.

  Next, on the side 14 of the beam 12, the first interval is placed respectively upward and downward from the drilling region 24, and the second interval in the first horizontal direction from the drilling region 24 toward the one end portion 16. A third non-through hole 46 is placed at a third position 44, and the first space is spaced from the piercing region 24 upward and downward, respectively, and from the piercing region 24 toward the other end portion 18. A fourth non-through hole 50 is provided in each of the fourth positions 48 that are spaced apart from each other in the horizontal direction. The third non-through hole 46 is opened at the third position 44 and extends inward in the second horizontal direction from the third position, and the fourth non-through hole 50 is opened at the fourth position 48 and the fourth position. Extends inward in the second horizontal direction.

  A first non-through hole 38, a second non-through hole 42, a third non-through hole 46, and a fourth non-through hole 50 are provided at the first position 36, the second position 40, the third position 44, and the fourth position 48, respectively. 3 and 4, two end portions 52 that are spaced apart in the vertical direction and extend in the second horizontal direction, respectively, and each end portion provided between the end portions are provided. A first rebar 56 having a central portion 54 perpendicular to the portion 52 is prepared, and one end 52 of the first rebar is the first non-through hole 38 and the other end 52 is the second non-through hole 42, respectively. Insert and secure each end 52 within the beam 12. Before inserting the first end 52 and the other end 52 of the first reinforcing bar 56 into the first non-through hole 38 and the second non-through hole 42, respectively, the first non-through hole 38 and the second non-through hole 42 are resinated. The system adhesive 58 is filled. When one end 52 and the other end 52 of the first reinforcing bar 56 are inserted into the first non-through hole 38 and the second non-through hole 42, respectively, each end 52 is fixed inside the beam 12 by the adhesive. . Instead of the above example in which the adhesive 58 is filled in each of the first non-through hole 38 and the second non-through hole 42, a filler (not shown) made of mortar may be filled. In this case, each end 52 of the first reinforcing bar 56 is fixed inside the beam 12 by the hardening of the filler. In this way, one end 52 of the first reinforcing bar 56 is attached to the first position 36, and the other end 52 of the first reinforcing bar 56 is attached to the second position 40.

  Thereafter, two parallel end portions 60 that are spaced apart in the first horizontal direction and extend in the second horizontal direction, respectively, and perpendicular to each end portion 60 provided between the end portions. A second rebar 64 having a central portion 62 is prepared, and one end 60 of the second rebar is inserted into the third non-through hole 46 and the other end 60 is inserted into the fourth non-through hole 50, respectively. The part 60 is fixed inside the beam 12. Before inserting the one end portion 60 and the other end portion 60 of the second reinforcing bar 64 into the third non-through hole 46 and the fourth non-through hole 50 respectively, resin is added to each of the third non-through hole 46 and the fourth non-through hole 50. A system adhesive (not shown) or a mortar filler (not shown) is filled. When one end portion 60 and the other end portion 60 of the second reinforcing bar 64 are inserted into the third non-through hole 46 and the fourth non-through hole 50, respectively, the end portions 60 are beamed by the adhesive or by hardening of the filler. 12 is fixed inside. In this manner, one end 60 of the second reinforcing bar 64 is attached to the third position 44, and the other end 60 of the second reinforcing bar 64 is attached to the fourth position 48.

  Thereafter, as shown in FIGS. 5 and 6, a projection 66 having an annular planar shape projecting outwardly in the second horizontal direction from the side portion of the beam 12 and surrounding the perforated region 24, as shown in FIGS. A protrusion 66 that covers the central portion 54 of the reinforcing bar 56 and the central portion 62 of the second reinforcing bar 64 is formed. The protrusion 66 is made of concrete or mortar. Before the projection 66 is formed, the region surrounding the perforated region 24 on the side portion 14 of the beam 12 is roughened in order to securely attach the projection 66 to the side portion 14 of the beam 12. After the formation of the protrusion 66, the through hole 30 is provided in the beam 12, as shown in FIGS.

  When the beam 12 receives a loading load, seismic force, etc., and a shearing force is applied to the beam 12, the first position 36 and the fourth position 48 are second when viewed in a plane perpendicular to the second horizontal direction. The position 40 and the third position 44 tend to be shifted in a direction intersecting with the first horizontal direction at an angle of approximately 45 degrees. At this time, the first reinforcing bar 56 prevents the first position 36 from shifting from the second position 40, and the second reinforcing bar 64 prevents the fourth position 48 from shifting from the third position 44. . Thus, each of the 1st reinforcing bar 56 and the 2nd reinforcing bar 64 resists the said shear force. Thereby, the beam 12 is reinforced.

  When reinforcing the beam 12, one end 52 of the first reinforcing bar 56 is at the first position 36, the other end 52 of the first reinforcing bar 56 is at the second position 40, and one end of the second reinforcing bar 64 is at the third position 44. 60, and the other end 60 of the second reinforcing bar 64 is attached to the fourth position 48, so that the side of the beam is compared with the conventional case where a steel plate having an annular plane shape surrounding the perforated region is attached to the side of the beam. The member attached to the part can be reduced in weight, and the member can be easily handled. Thereby, workability | operativity at the time of reinforcement of a beam can be improved.

  The third non-through hole 46 and the fourth non-through hole 50 are provided at the third position 44 and the fourth position 48, respectively, and the first non-through hole 38 and the second non-through hole are provided at the first position 36 and the second position 40, respectively. Instead of the above example performed after the through hole 42 is provided, the first non-through hole 38 and the second non-through hole 42 may be provided at the first position 36 and the second position 40, respectively. The first non-through hole 38 and the second non-through hole 42 may be provided at the first position 36 and the second position 40, respectively.

  Inserting one end 60 of the second reinforcing bar 64 into the third non-through hole 46, the other end 60 into the fourth non-through hole 50, and fixing each end 60 inside the beam 12, After inserting one end 52 of the first reinforcing bar 56 into the first non-through hole 38 and the other end 52 into the second non-through hole 42 and fixing each end 52 inside the beam 12 Instead of the above example, one end 52 of the first reinforcing bar 56 is inserted into the first non-through hole 38, the other end 52 is inserted into the second non-through hole 42, and each end 52 is inserted into the beam 12 It may be performed before fixing inside. The beam 12 may be reinforced after the through hole 30 is provided in the beam 12 instead of the above example in which the beam 12 is provided before the through hole 30 is provided in the beam.

  In the example shown in FIG. 9, the first non-through hole 38, the second non-through hole 42, the third non-through hole 46, and the first position 36, the second position 40, the third position 44, and the fourth position 48, respectively. 4 After the non-through hole 50 is provided, before the first rebar 56 is prepared, a first groove 68 extending in the vertical direction from the first position 36 to the second position 40 on the side portion 14 of the beam 12 and a third position A second groove extending in the first horizontal direction from 44 to a fourth position is provided. Each of the first groove 68 and the second groove 70 is opened outward in the second horizontal direction.

  In this case, as shown in FIGS. 10 and 11, one end 52 of the first reinforcing bar 56 is inserted into the first non-through hole 38, and the other end 52 is inserted into the second non-through hole 42. When 52 is fixed to the inside of the beam 12, the central portion 54 of the first reinforcing bar 56 is received in the first groove 68. Also, when one end 60 of the second reinforcing bar 64 is inserted into the third non-through hole 46 and the other end 60 is inserted into the fourth non-through hole 50 and each end 60 is fixed inside the beam 12. The central portion 62 of the second reinforcing bar 64 is received in the second groove 70. After fixing each end 52 of the first reinforcing bar 56 to the inside of the beam 12 and fixing each end 60 of the second reinforcing bar 64, as shown in FIGS. A filling material 72 made of mortar is filled in each of the second grooves 70. Thereby, each of the central part 54 of the first reinforcing bar 56 and the central part 62 of the second reinforcing bar 64 is covered with the filler 72. Since it is not necessary to form the protrusion 66 on the side portion 14 of the beam 12, the appearance of the beam 12 is not impaired by the protrusion.

  Providing the first groove 68 and the second groove 70 on the side portion 14 of the beam 12 means that the first position 36, the second position 40, the third position 44, and the fourth position 48 have first non-through holes 38, After providing the second non-through hole 42, the third non-through hole 46, and the fourth non-through hole 50, the first position 36 and the second position 40 are replaced with the above example performed before the first rebar 56 is prepared. The first non-through hole 38, the second non-through hole 42, the third non-through hole 46, and the fourth non-through hole 50 may be provided at the third position 44 and the fourth position 48, respectively.

  In the example shown in FIG. 14, one end 52 and the other end 52 of the first reinforcing bar 56 are attached to the first position 36 and the second position 40 on one side 14 of the beam 12, respectively, and the third position 44 and the fourth position 4. Instead of the example shown in FIG. 6 in which the one end 60 and the other end 60 of the second reinforcing bar 64 are respectively attached to the position 48, the first reinforcing bar is located at the first position 36 and the second position 40 on each side part 14 of the beam 12. One end 52 and the other end 52 of 56 are attached, and one end 60 and the other end 60 of the second reinforcing bar 64 are attached to the third position 44 and the fourth position 48, respectively. In this case, the beam 12 has two opposite sides 14 spaced in the second horizontal direction, each side having two end portions spaced in the first horizontal direction. 16, 18, a top portion 20 and a bottom portion 22 spaced between the end portions, and a perforated region 24 provided between the top portion 20 and the bottom portion 22.

  In the example illustrated in FIG. 15, the first reinforcing bar 56 includes a plurality of members instead of the example illustrated in FIG. 5 including one member. The first reinforcing bars 56 are a first member 56a and a second member 56b spaced apart in the vertical direction, each of which is a vertical portion extending in the vertical direction and the second horizontal direction perpendicular to the vertical portion. A first member 56a and a second member 56b having L-shapes, each of which has a lateral portion extending in a vertical direction, an upper end portion fixed to the vertical portion of the first member 56a, and a lower end portion fixed to the vertical portion of the second member 56b. And a linear third member 56c extending in the vertical direction. When one end 52 of the first reinforcing bar 56 is inserted into the first non-through hole 38 and the other end 52 is inserted into the second non-through hole 42, the lateral portion of the first member 56a is formed into the first non-through hole 38. The lateral portions of the second member 56b are inserted into the second non-through holes 42, respectively.

  The insertion may be performed in a state where the upper end portion of the third member 56c is fixed to the vertical portion of the first member 56a and the lower end portion of the third member 56c is fixed to the vertical portion of the second member 56b. Alternatively, after the insertion, the upper end portion of the third member 56c may be fixed to the vertical portion of the first member 56a, and the lower end portion of the third member 56c may be fixed to the vertical portion of the second member 56b. Good. In this case, even if there is a construction error at each position of the first non-through hole 38 and the second non-through hole 42, the insertion is not hindered. The first reinforcing bar 56 is composed of a first member 56a and a second member 56b instead of the example shown in FIG. 15 including the first member 56a, the second member 56b, and the third member 56c. You may not have it. In this case, the vertical portion of the second member 56b is fixed to the vertical portion of the first member 56a.

  In the example shown in FIG. 15, the second reinforcing bars 64 are a first member 64 a and a second member 64 b that are spaced apart in the first horizontal direction, each of which is a vertical portion that extends in the first horizontal direction, and A first member 64a and a second member 64b each having an L-shape composed of a lateral portion extending in the second horizontal direction perpendicular to the longitudinal portion, and one end portion of the first member 64a on the longitudinal portion of the first member 64a And a linear third member 64c extending in the first horizontal direction and fixed to the vertical portion of the second member 64b. When the one end 60 of the second reinforcing bar 64 is inserted into the third non-through hole 46 and the other end 60 is inserted into the fourth non-through hole 50, the lateral portion of the first member 64a is formed into the third non-through hole 46. The lateral portions of the second member 64b are inserted into the fourth non-through holes 50, respectively. The second reinforcing bar 64 is composed of a first member 64a and a second member 64b in place of the example shown in FIG. 15 including the first member 64a, the second member 64b, and the third member 64c. You may not have it. In this case, the vertical portion of the second member 64b is fixed to the vertical portion of the first member 64a.

  In the example shown in FIG. 16, one end 52 and the other end 52 of the first reinforcing bar 56 are attached to the first position 36 and the second position 40, respectively, and the second reinforcing bar 64 is respectively attached to the third position 44 and the fourth position 48. In addition to attaching the one end 60 and the other end 60, one end and the other end of the third reinforcing bar 78 are attached to the fifth position 74 and the sixth position 76, respectively, and the seventh position 80 and the eighth position 82, respectively. One end and the other end of the fourth reinforcing bar 84 are attached.

  In this case, the first non-through hole 38, the second non-through hole 42, the third non-through hole 46, and the fourth non-through hole at the first position 36, the second position 40, the third position 44, and the fourth position 48, respectively. After providing 50, before preparing the first reinforcing bar 56, in the side portion 14 of the beam 12, from the perforated region 24 toward the end portions 16, 18, the first horizontal direction is larger than the first interval, A fifth non-through hole 88 is formed at a fifth position 74 that is spaced apart by the third distance (indicated by reference numeral 86 in FIG. 16) and spaced upward by the second distance. A sixth non-through hole 90 is provided at each of the sixth positions 76 that are spaced apart from each other toward the end portions 16 and 18 in the first horizontal direction and spaced downward by the second distance. The fifth non-through hole 88 is opened at the fifth position 74 and extends inward in the second horizontal direction from the fifth position, and the sixth non-through hole 90 is opened at the sixth position 76 and the sixth position. Extends inward in the second horizontal direction.

  After the fifth non-through hole 88 and the sixth non-through hole 90 are provided in the fifth position 74 and the sixth position 76, respectively, the third interval is placed upward and downward from the perforated region 24, and one end portion. The seventh non-through hole 92 at the seventh position 80 spaced in the first horizontal direction toward the first position 16, and the third spacing from the perforated region 24 upward and downward, respectively, and An eighth non-through hole 94 is provided at each of the eighth positions 82 that are spaced apart from each other in the first horizontal direction toward the other end portion 18. The seventh non-through hole 92 is opened at the seventh position 80 and extends inward in the second horizontal direction from the seventh position, and the eighth non-through hole 94 is opened at the eighth position 82 and the eighth position. Extends inward in the second horizontal direction.

  After providing the seventh non-through hole 92 and the eighth non-through hole 94 at the seventh position 80 and the eighth position 82, respectively, the first reinforcing bar 56 is prepared, and the first non-penetrating end portion 52 of the first reinforcing bar is provided. The other end 52 is inserted into the hole 38 in the second non-through hole 42, and each end 52 is fixed inside the beam 12. Thereafter, there are two parallel end portions that are spaced apart in the vertical direction, each extending in the second horizontal direction, and a central portion that is provided between the end portions and that is perpendicular to each end portion. 3 rebars 78 are prepared, one end of the third rebar is inserted into the fifth non-through hole 88, the other end is inserted into the sixth non-through hole 90, and each end is fixed inside the beam 12. To do.

  Then, the 2nd reinforcing bar 64 is prepared, the one end part 60 of this 2nd reinforcing bar is inserted in the 3rd non-through hole 46, the other end part 60 is inserted in the 4th non-through hole 50, respectively, and each end part 60 is inserted. It is fixed inside the beam 12. Thereafter, two parallel end portions spaced apart in the first horizontal direction and extending in the second horizontal direction, respectively, and a central portion provided between the end portions and perpendicular to each end portion A fourth reinforcing bar 84 having one end of the fourth reinforcing bar is inserted into the seventh non-through hole 92 and the other end of the fourth reinforcing bar 84 is inserted into the eighth non-through hole 94. Secure inside. Thereafter, a protrusion 66 is formed on the side portion 14 of the beam 12. The protrusion 66 covers the central part 54 of the first reinforcing bar 56, the central part 62 of the second reinforcing bar 64, the central part of the third reinforcing bar 78, and the central part of the fourth reinforcing bar 84.

  In the example shown in FIG. 17, the first position 36 is viewed from a plane perpendicular to the second horizontal direction, toward the end portions 16 and 18 from the perforated region 24 with respect to the first horizontal direction. The first interval (indicated by reference numeral 32 in FIG. 17) is placed in a first tilt direction that intersects at an angle of approximately 45 degrees, and the second interval in the second tilt direction perpendicular to the first tilt direction is upward. A second interval (denoted by reference numeral 34 in FIG. 17) is provided, and the second position 40 is arranged in the first inclined direction from the perforated region 24 toward each end portion 16, 18. And the second interval is disposed in the second inclined direction downward. Further, the third position 44 is spaced apart from the perforated region 24 in the second inclined direction by the first inclined direction, and toward the one end portion 16 in the first inclined direction. And a fourth position 48 is spaced apart in the second inclined direction from the perforated region 24 respectively upward and downward and in the first inclined direction toward the other end portion 18. There is a second interval.

  In this case, the first reinforcing bars 56 are spaced in the second inclined direction and extend in the second horizontal direction, and each end provided between the two parallel ends 52 and the ends. A central portion 54 perpendicular to the portion 52 is provided. The second reinforcing bars 64 are spaced in the first inclined direction and extend in the second horizontal direction, each of the two parallel end portions 60 and each end portion provided between the end portions. It has a central part 62 perpendicular to 60. In the example shown in FIG. 17, one end 60 of the second reinforcing bar 64 is inserted into the third non-through hole 46, the other end 60 is inserted into the fourth non-through hole 50, and each end 60 is connected to the beam 12. After fixing to the inside, a projection 66 is formed on the side 14 of the beam 12.

  Instead of the example shown in FIG. 17 in which the protrusion 66 is formed on the side portion 14 of the beam 12, the protrusion 66 may not be formed. In this case, the first non-through hole 38, the second non-through hole 42, the third non-through hole 46, and the fourth non-through hole at the first position 36, the second position 40, the third position 44, and the fourth position 48, respectively. After providing 50, before preparing the first rebar 56, the side 14 of the beam 12 is opened outward in the second horizontal direction and extends from the first position 36 to the second position 40 in the second inclined direction. A first groove (not shown) and a second groove (not shown) that opens outward in the second horizontal direction and extends from the third position 44 to the fourth position 48 in the first inclined direction are provided. Thereafter, when one end 52 of the first reinforcing bar 56 is inserted into the first non-through hole 38 and the other end 52 is inserted into the second non-through hole 42, the central part 54 of the first reinforcing bar 56 is inserted into the first groove. When the first end 60 of the second reinforcing bar 64 is inserted into the third non-through hole 46 and the other end 60 is inserted into the fourth non-through hole 50 so that the central part 62 of the second reinforcing bar 64 is To be received in 2 grooves. After fixing each end 52 of the first reinforcing bar 56 to the inside of the beam 12 and fixing each end 60 of the second reinforcing bar 64, each of the first groove and the second groove has a mortar. Filling material consisting of

  When the shearing force acting on the beam 12 is relatively small, attaching the one end 52 and the other end 52 of the first reinforcing bar 56 to the first position 36 and the second position 40, respectively, and the third position 44 and the fourth position. 48, instead of the example shown in FIG. 5 in which both the one end portion 60 and the other end portion 60 of the second reinforcing bar 64 are attached, respectively, the first position 36 and the second position 40 are respectively shown in FIG. Only the one end 52 and the other end 52 of the first reinforcing bar 56 are attached, and the one end 60 and the other end 60 of the second reinforcing bar 64 are not attached to the third position 44 and the fourth position 48, respectively. May be. In addition, as shown in FIG. 19, only one end 60 and the other end 60 of the second reinforcing bar 64 are attached to the third position 44 and the fourth position 48, respectively. It is not necessary to attach the one end part 52 and the other end part 52 of the 1st reinforcing bar 56, respectively.

  Instead of applying the above-described reinforcing method to the beam 12, as shown in FIG. 20, the reinforcing method may be applied to a wall 96 extending in the first horizontal direction when viewed in a horizontal plane. Further, the above reinforcing method may be applied to the floor slab 28. In this case, the floor slab 28 comprises two end portions spaced in the first horizontal direction, two side portions spaced in the second horizontal direction between the end portions, and the side With a horizontal top or bottom having a perforated area provided between the sections, and reinforcement to the floor slab 28 includes through-holes extending vertically through the floor slab 28 through the perforated area. It is done before installation.

DESCRIPTION OF SYMBOLS 10 Building 12 Beam 14 Side part 16, 18 End part 20 Top part 22 Bottom part 24 Perforated area 30 Through hole 36 1st position 38 1st non-through hole 40 2nd position 42 2nd non-through hole 44 3rd position 46 1st 3 Non-through hole 48 4th position 50 4th non-through hole 52 End of 1st reinforcing bar 54 Central part of 1st reinforcing bar 56 1st reinforcing bar 60 End of 2nd reinforcing bar 62 Central part of 2nd reinforcing bar 64 2nd reinforcing bar 66 Projection 68 First groove 70 Second groove 72 Filler

Claims (6)

A reinforced concrete beam of an existing building extending in a first horizontal direction and having two end portions spaced apart in the first horizontal direction, and a top portion and a bottom spaced between the end portions A perforation region in a beam having a portion and a side portion perpendicular to a second horizontal direction perpendicular to the first horizontal direction, the portion having a perforation region provided between the top portion and the bottom portion Through the beam in the second horizontal direction, reinforcing the beam before providing a through hole for piping,
A first position in the side of the beam that is spaced apart in the first horizontal direction from the perforated region toward each end portion and spaced upward by a second distance that is greater than the first distance; In addition, a first non-through hole that is opened at the first position and extends inward in the second horizontal direction from the first position is formed in the first horizontal direction from the perforated region toward each end portion. And a second non-through hole which is opened at the second position and extends inward in the second horizontal direction from the second position at a second position spaced apart and second spaced apart. One step,
Opened in the third position to the third position spaced apart from the perforation area respectively upward and downward and spaced in the first horizontal direction towards one end. The third non-through hole extending inward in the second horizontal direction from the third position is spaced apart from the perforation region by the first distance and toward the other end portion. A second step in which a fourth non-through hole is provided at a fourth position spaced in the second direction and opened at the fourth position and extending inward in the second horizontal direction from the fourth position;
A first reinforcing bar that is vertically spaced apart and extends in the second horizontal direction, each having two parallel ends and a central portion that is provided between the ends and that is perpendicular to each end. A third step of preparing
A fourth step of inserting one end of the first rebar into the first non-through hole, the other end into the second non-through hole, and fixing each end to the inside of the beam;
Two parallel end portions spaced apart in the first horizontal direction and extending in the second horizontal direction, respectively, and a central portion provided between the end portions and perpendicular to each end portion A fifth step of preparing a second rebar;
And a sixth step of inserting one end of the second reinforcing bar into the third non-through hole, the other end into the fourth non-through hole, and fixing each end to the inside of the beam. , Beam reinforcement method.   A protrusion made of concrete or mortar that has an annular planar shape projecting outwardly in the second horizontal direction from the side portion to the side portion of the beam after the sixth step and surrounding the perforated region; The method of reinforcing a beam according to claim 1, comprising a seventh step of forming a projection covering the central portion of one reinforcing bar and the central portion of the second reinforcing bar. Before the first step or between the second step and the third step, the side of the beam is opened outward in a second horizontal direction, and the vertical direction from the first position to the second position. An eighth step of providing a first groove extending in the first horizontal direction and a second groove extending in the first horizontal direction from the third position to the fourth position;
In the fourth step, the central portion of the first reinforcing bar is received in the first groove, and in the sixth step, the central portion of the second reinforcing bar is received in the second groove,
The beam reinforcing method according to claim 1, further comprising a ninth step of filling each of the first groove and the second groove with a filler made of mortar after the sixth step. A reinforced concrete beam of an existing building extending in a first horizontal direction and having two end portions spaced apart in the first horizontal direction, and a top portion and a bottom spaced between the end portions A perforation region in a beam having a portion and a side portion perpendicular to a second horizontal direction perpendicular to the first horizontal direction, the portion having a perforation region provided between the top portion and the bottom portion Through the beam in the second horizontal direction, reinforcing the beam before providing a through hole for piping,
A first position in the side of the beam that is spaced apart in the first horizontal direction from the perforated region toward each end portion and spaced upward by a second distance that is greater than the first distance; In addition, a first non-through hole that is opened at the first position and extends inward in the second horizontal direction from the first position is formed in the first horizontal direction from the perforated region toward each end portion. And a second non-through hole that is opened at the second position and extends inward in the second horizontal direction from the second position at a second position that is spaced downward and spaced apart by the second distance. ,
Reinforcing bars that are vertically spaced apart and extend in the second horizontal direction, each having two parallel end portions and a central portion perpendicular to each end portion provided between the end portions, are prepared. To do,
Inserting one end of the reinforcing bar into the first non-through hole, the other end into the second non-through hole, and fixing each end to the inside of the beam. . A reinforced concrete beam of an existing building extending in a first horizontal direction and having two end portions spaced apart in the first horizontal direction, and a top portion and a bottom spaced between the end portions A perforation region in a beam having a portion and a side portion perpendicular to a second horizontal direction perpendicular to the first horizontal direction, the portion having a perforation region provided between the top portion and the bottom portion Through the beam in the second horizontal direction, reinforcing the beam before providing a through hole for piping,
A first interval is provided above and below the perforation region at each side of the beam, and a second interval greater than the first interval in the first horizontal direction toward one end portion. At the first position, the first non-through hole opened at the first position and extending inward in the second horizontal direction from the first position is spaced apart from the perforated region by the first interval. And a second position spaced apart from the second position in the first horizontal direction toward the other end and opened at the second position and extending inward in the second horizontal direction from the second position. Providing non-through holes,
Two parallel end portions spaced apart in the first horizontal direction and extending in the second horizontal direction, respectively, and a central portion provided between the end portions and perpendicular to each end portion Preparing rebar,
Inserting one end of the reinforcing bar into the first non-through hole, the other end into the second non-through hole, and fixing each end to the inside of the beam. . A reinforced concrete beam of an existing building extending in a first horizontal direction and having two end portions spaced apart in the first horizontal direction, and a top portion and a bottom spaced between the end portions A perforation region in a beam having a portion and a side portion perpendicular to a second horizontal direction perpendicular to the first horizontal direction, the portion having a perforation region provided between the top portion and the bottom portion Through the beam in the second horizontal direction, reinforcing the beam before providing a through hole for piping,
As viewed in a plane perpendicular to the second horizontal direction, intersects at an angle of approximately 45 degrees with respect to the first horizontal direction from the perforated region to each end portion at the side of the beam. The first interval is placed in the first tilt direction and the second position is set upward in the second tilt direction perpendicular to the first tilt direction and the second interval is greater than the first interval. A first non-through hole open at one position and extending inward in a second horizontal direction from the first position, the first spacing in the first inclined direction from the perforated region toward each end portion; And a second non-through hole that opens downward in the second position and extends inward in the second horizontal direction from the second position to a second position spaced apart in the second inclined direction in the second inclined direction. Providing,
A third position spaced apart from the perforated region in the second inclined direction upward and downward, respectively, and in the first inclined direction toward the one end portion; A third non-through hole opened at the third position and extending inward in the second horizontal direction from the third position is spaced apart from the perforation region in the second inclined direction upward and downward, respectively. And a fourth position that is open at the fourth position and extends inward in the second horizontal direction from the fourth position to a fourth position spaced apart from the second in the first inclined direction toward the other end portion. Providing non-through holes,
Two parallel ends that are spaced apart in the second inclined direction, each extending in the second horizontal direction, and a central portion that is provided between the ends and perpendicular to each end. Preparing the first rebar,
Inserting one end of the first rebar into the first non-through hole, the other end into the second non-through hole, and fixing each end to the inside of the beam;
Two parallel ends that are spaced apart in the first inclined direction and each extend in the second horizontal direction, and a central portion that is provided between the ends and that is perpendicular to each end. Preparing a second rebar,
Including inserting one end of the second rebar into the third non-through hole, the other end into the fourth non-through hole, and fixing each end to the inside of the beam. Reinforcement method.

Images