JP4249104B2 - Beam reinforcement structure and beam reinforcement method - Google Patents

Description

  The present invention relates to a beam reinforcing structure and a reinforcing method for reinforcing a beam of an existing building to be extended.

  The life span of buildings ranges from the typical decades to hundreds of years. Meanwhile, the building may be expanded due to changes in usage and functions required for the building according to various social needs.

  In the structure of a small building with a small load such as a house, a shed beam or a floor beam is received by an outer beam, and the outer beam is supported by a frame such as a column or a brace. In some cases, shed beams or floor beams are directly supported by the frame. As a method of adding to the existing building of the latter structure, the eaves part of the existing building is treated and a metal fitting is arranged to connect the outer beam to the metal fitting, and the extension beam is perpendicular to the outer beam There is one connected to the metal fitting (see Patent Document 1). According to this construction method, it is possible to install and extend the outer peripheral beam and the shed beam without completely dismantling the hut group and the back of the eaves of the existing house. However, in this construction method, the metal fitting is supported by a shaft set such as a pillar or a brace that bears a vertical load, and when removing the shaft set and attempting to widen the opening between the existing building and the extension part, It is conceivable that the beam of an existing building is bent due to the vertical load and causes deflection, and if this deflection is large, there is a risk that the building will tilt or collapse.

Conventionally, as a method of removing a shaft supporting a beam of an existing building to be expanded and reinforcing the beam, there is a method of adding a receiving beam under the beam of the existing building. If there is an outer peripheral beam on the outer peripheral part of the extension of the existing building, this receiving beam is arranged immediately below the outer peripheral beam. If there is no outer peripheral beam, the receiving beam is below the lower beam or floor beam. Or it arrange | positions in the direction orthogonal to a floor beam. As another construction method, there is a method in which an existing shed beam or floor beam is removed and a new shed beam or floor beam that can be extended from an existing building to an extension part is rebuilt.
JP 2004-60394 A

  However, in the method of adding a receiving beam, the receiving beam is installed at a lower level than the existing beam, so that the beam type of the receiving beam protrudes from the ceiling surface or the ceiling height is lowered, and the existing beam Since columns supporting both ends of the receiving beam are installed on the indoor side of the column, there is a problem that the column type of the column comes out indoors in addition to the column type of the existing column. In addition, since the receiving beam is installed after the shaft that supports the existing beam is removed, a support work for supporting the existing beam is not included between the removal of the shaft and installation of the receiving beam. It is necessary to install it, and it takes time for construction. Further, in the method of re-building the shed beam or floor beam, the floor and ceiling of the existing building must be removed in order to remove the existing shed beam or floor beam, which is a large-scale construction and requires considerable cost. In addition, the rebuilt shed or floor beam has a longer span than before the extension, so the beam will be larger, and in this case the beam type will protrude from the ceiling surface or the ceiling height will be lower than before the extension. There is.

  The present invention has been made in view of the above-mentioned problems, and it is possible to take a wide opening between an existing building to be added and an extension part without extra beam type and column type in the room. It is an object of the present invention to provide a reinforcing structure and a reinforcing method for a beam that are easy to reduce the cost.

  To achieve the above object, the beam reinforcing structure according to claim 1 is a beam reinforcing structure for removing a part of a shaft supporting the outer peripheral beam of an existing building to be expanded and reinforcing the outer peripheral beam. In the structural member on the extension side, the support beam is disposed in the vicinity of the outer peripheral beam at a position where the lower surface thereof is equal to or higher than the lower surface of the outer peripheral beam, and substantially parallel to the outer peripheral beam. Is connected by a connecting member.

  The beam reinforcing structure according to claim 2 is the beam reinforcing structure according to claim 1, wherein the back-end receiving beam is provided on the extension-side structural member on the side opposite to the outer peripheral beam with respect to the supporting beam. Are arranged in parallel with each other, and the retaining beam and the supporting beam are connected by a retaining beam.

  The beam reinforcing structure according to claim 3 is a beam reinforcing structure in which the shaft supporting the extension side of the shed beam or floor beam of the existing building to be extended is removed and the shed beam or floor beam is reinforced. The structural beam on the extension side has a supporting beam at a position where the lower surface of the supporting beam is equal to or higher than the height of the lower surface of the cabin beam or floor beam. The shed beam or floor beam and the support beam are connected to each other.

  The beam reinforcing structure according to claim 4 is the beam reinforcing structure according to claim 3, wherein the structural support member on the extension side is arranged such that the retaining beam is opposite to the shed beam or floor beam with respect to the support beam. The support beams are arranged in parallel to each other at the same height as the support beams, and the support beams and the support beams are connected by the support beams.

  The beam reinforcing method according to claim 5 is a beam reinforcing method for reinforcing a connecting portion between the shed beam or floor beam and the support beam by the beam reinforced structure according to claim 3 or 4, wherein Connecting the beam or floor beam and the support beam, and removing one of the shafts supporting the end of the shed beam or floor beam on the extension side with a pair of left and right with respect to the edge of the shed beam or floor beam; One of a pair of connection portion reinforcing members is joined to the lower surface of the side beam of the shed beam or floor beam, and the lower surface of the support beam, the other of the pair of shaft groups is removed, and the shed The other side of the connecting portion reinforcing member is joined to the side of the lower surface of the beam or floor beam and the support beam from which the shaft group is removed.

According to the beam reinforcing structure of the first aspect of the present invention, the supporting beam is substantially the same as the outer peripheral beam in the vicinity of the outer peripheral beam at a position where the lower surface of the supporting beam is higher than the height of the lower surface of the outer peripheral beam. Since it is arranged in parallel and the outer beam and the support beam are connected by a connecting member, the outer beam of the existing building is reinforced to support the outer beam without taking out the beam type and column type indoors. A part of the shaft to be removed can be removed, and an opening can be widened between the existing building and the extension part. Moreover, construction is easy and cost can be suppressed.

  According to the beam reinforcing structure of claim 2, in addition to the effect of the beam reinforcing structure of claim 1, the retaining beam is opposite to the outer peripheral beam with respect to the support beam in the structural member on the extension side. It is arranged side by side at the same height as the support beam, and the retainer receiving beam and the support beam are connected by the retainer beam, so that it acts on the outer periphery beam after the shaft supporting the outer periphery beam is removed. It is possible to prevent the support beam from being twisted by the vertical load.

  According to the reinforcing structure for a beam according to claim 3, the supporting beam is attached to the extension-side structural member at a position where the lower surface of the support beam is equal to or higher than the height of the lower surface of the cabin beam or floor beam. Since the shed beam or floor beam and the support beam are connected to each other in the direction orthogonal to the shed beam or floor beam, the beam type and the column type are not put out in the room. Reinforce the shed beam or floor beam of the existing building and remove the shaft that supports the end of the shed beam or floor beam on the extension side, and widen the opening between the existing building and the extension part Can do. Moreover, construction is easy and cost can be suppressed.

  According to the beam reinforcing structure of claim 4, in addition to the effect of the beam reinforcing structure of claim 3, the guard beam on the extension-side structural member is the shed beam or floor with respect to the support beam. A shaft that supports the end of the shed beam or floor beam on the extension side because it is juxtaposed at the same height as the support beam on the opposite side of the beam, and the reserve beam and the support beam are connected by the reserve beam It is possible to prevent the support beam from being twisted by a vertical load acting on the shed beam or floor beam after the set is removed.

  According to the beam reinforcing method of claim 5, the shed beam or floor beam and the support beam are connected by the beam reinforcement structure according to claim 3 or 4, and the beam of the shed beam or floor beam is connected. Remove one side of the shaft set that supports the extension side end of the shed beam or floor beam in a pair of left and right, the lower surface of the shed beam or floor beam from which the shaft set is removed, and the lower surface of the support beam , One of the pair of connection portion reinforcing members is joined, the other of the pair of shaft sets is removed, and the side of the lower side of the shed beam or floor beam and support beam is removed, the connection portion reinforcing member Therefore, the connecting portion between the shed beam or the floor beam and the support beam can be easily and safely reinforced without separately installing a support work for supporting the shed beam or the floor beam.

A beam reinforcing structure according to a first embodiment of the present invention will be described below with reference to the drawings. As the present embodiment, as shown in FIG. 1, a case where a one-storied extension part 2 is added to the outer peripheral surface 2 span of a one-story existing building 1 will be described.
FIG. 2 shows a schematic configuration of the beam reinforcing structure according to the present embodiment. As shown in the drawing, the outer peripheral beam 3, the supporting beam 4, the connecting member 5, the connecting portion reinforcing plate 6 of the existing building 1, It is mainly composed of the reserved beam 7 and the reserved beam 8.

  The outer peripheral beam 3 is one of the structural members that form the outer peripheral surface of the existing building 1, and is an H-shaped steel horizontal member that connects the upper ends of shafts such as columns and braces on the outer peripheral surface. An H-beam steel beam 9 is connected to the outer beam 3 in a direction perpendicular to the outer beam 3 via an L-shaped beam connection plate 10. Although not shown, the outer beam 3 and the beam are connected to the outer beam 3. Below the connecting portion 9, a shaft bearing a vertical load is connected to the lower surface of the lower flange 11 of the outer peripheral beam 3. The lower flange 11 is provided with a bolt hole 12.

  As shown in FIGS. 1 to 3, the support beam 4 is one of structural members constituting the shaft assembly on the existing building 1 side of the extension portion 2, and is a wide H-shaped steel horizontal member having a large torsional rigidity. The lower surface of the outer peripheral beam 3 is disposed at the same height as the lower surface of the outer peripheral beam 3 and in the vicinity of the outer peripheral beam 3 at intervals determined by a strength test. The beam of the support beam 4 is preferably equal to or less than the beam of the outer circumferential beam 3, particularly when the beam is the same beam as the outer circumferential beam 3 and arranged at the same height as the outer circumferential beam 3. Even if the portion 2 has a plurality of floors, it is easy to align the ceiling height and floor level of the extension portion 2 with the existing building 1, which is preferable. Both ends of the support beam 4 are connected to a beam 13 which is a structural member on the extension side, and a connection portion between the support beam 4 and the beam 13 is supported by a shaft set (not shown). In addition, since the column of this frame is installed on the extension side with respect to the column of the existing building 1, the column type of the column does not go out to the indoor side more than the column type of the existing building 1 facing the column. .

  Further, the support beam 4 includes an existing beam connection portion 14 that protrudes from the existing building 1 at a position corresponding to the connection member 5. As shown in FIG. 3, the existing beam connecting portion 14 includes an existing beam connecting plate 15 that is in contact with the connection member 5, and an upper surface plate that is vertically fixed to the upper and lower ends of the existing beam connecting plate 15 on the extension side. 16 and a lower plate 17, and a reinforcing plate 18 provided inside the substantially U-shaped portion. The upper plate 16 has an upper surface on the upper flange 19 of the support beam 4. And the bottom plate 17 is welded and fixed in a direction orthogonal to the support beam 4 so that the bottom surface is aligned with the lower flange 20 of the support beam 4. Further, the reinforcing plate 18 is welded and fixed to the upper flange 19, the lower flange 20, and the web 21 of the support beam 4, and the reinforcing plate 18 is provided with a scallop 22 so as to prevent welding double. is there. As shown in FIG. 2, the existing beam connection plate 15 is provided with a bolt hole 23, and the lower surface plate 17 is provided with a bolt hole 24. The width of the existing beam connecting portion 14 is approximately the same as the width of the connecting member 5, and the protruding length from the support beam 4 is in accordance with the interval determined by the strength test of the outer peripheral beam 3 and the support beam 4. It is determined.

  As shown in FIGS. 2 and 3, the connecting member 5 is fixed vertically to the web abutting plate 26 that abuts against the web 25 of the outer peripheral beam 3 and to the upper and lower ends of the web abutting plate 26 toward the extension side. The upper beam abutment plate 27, the lower flange abutment plate 28, and the web abutment plate 26 are fixed perpendicularly to the upper flange abutment plate 27 and the lower flange abutment plate 28. And a reinforcing plate 30 provided inside the box-shaped portion so that the box-shaped portion does not buckle. The connecting member 5 has a height determined so as to contact the upper flange 31, the lower flange 11, and the web 25 of the outer peripheral beam 3, and the web contact plate 26, the upper flange contact plate 27, and the web contact plate 26 and the lower flange contact plate 28 are chamfered and have a substantially D-shaped cross section. Further, the length of the connecting member 5 on the extension side is a length protruding from the upper flange 31 and the lower flange 11 in a state of being in contact with the web 25, and the support for the outer peripheral beam 3 appropriately determined by the strength test. It is determined by the position of the beam 5 and the projecting dimension of the existing beam connecting portion 14 from the support beam 5. The width of the connecting member 5 is approximately the same as that of the roof beam 9. The web contact plate 26 has bolt holes 32, the support beam connection plate 29 has bolt holes 33 corresponding to the bolt holes 23 of the existing beam connection plate 15, and the lower flange contact plate 28 has bolts. Each hole (not shown) is provided.

  As shown in FIGS. 2 and 3, the connecting portion reinforcing plate 6 is provided below the connecting portion between the connecting member 5 and the existing beam connecting portion 14, and against the tensile stress applied to the lower side of the connecting portion. Resist. The connecting portion reinforcing plate 6 has a width comparable to that of the connecting member 5 and the existing beam connecting portion 14, and the bolt hole 24 of the lower surface plate 17 of the existing beam connecting portion 14 and the bolt hole of the lower flange 11 of the outer peripheral beam 3. 12 and a bolt hole 34 corresponding to a bolt hole (not shown) of the lower flange contact plate 28 of the connecting member 5 is provided.

  In order to reinforce the outer peripheral beam 3 with the support beam 4, the connecting member 5, and the connecting portion reinforcing plate 6 when the extension is performed, first, as shown in FIG. The flange 11 is pushed in until it abuts against the web 25, and is fixed to the web 25 of the outer peripheral beam 3 by bolting on the extension of the shed beam 9 in the bolt hole 32 provided in the web abutting plate 26. Next, the support beam 4 is disposed at a predetermined position on the extension side, and the support beam 4 and the connection member 5 are connected to the corresponding bolt hole 23 and bolt hole 33 of the existing beam connection plate 15 and the support beam connection plate 29. Secure with bolts. Then, the connecting portion reinforcing plate 6 is brought into contact with the lower surface plate 17 of the existing beam connecting portion 14 and the lower surface of the lower flange 11 of the outer peripheral beam 3, and the bolt hole 34 and the bolt hole corresponding to the bolt hole 34 are bolted. Join. In this way, the outer peripheral beam 3 is reinforced, and the shaft supporting the portion facing the support beam 4 of the outer peripheral beam 3 such as the shaft connected below the connecting portion of the outer peripheral beam 3 and the shed beam 9 is removed. By doing so, an opening can be taken widely between the existing building 1 and the extension part 2. Note that the shaft group to be removed excludes the shaft group of the existing building 1 that faces the shaft group that supports the connecting portion of the support beam 4 and the beam 13.

  As shown in FIGS. 1 and 2, the holding beam 7 is an H-shaped steel having the same beam as the support beam 4, and is the same height as the support beam 4 on the side opposite to the outer beam 3 with respect to the support beam 4. Furthermore, they are juxtaposed at intervals determined by the strength test. Both ends of the holding beam 7 are connected to the beam 13.

  As shown in FIG. 1 to FIG. 3, the stay beam 8 is an H-shaped steel having the same beam as the support beam 4 and the stay receiving beam 7, and the length is the same as that of the support beam 4 determined by the strength test. It is determined by the distance between the receiving beams 7. End portions of the retaining beam 8 are connected to the supporting beam 4 and the retaining beam 7 via the beam connection plate 10 and are arranged in a direction orthogonal to the supporting beam 4 and the retaining beam 7.

  As a procedure for disposing the retaining beam 7 and the retaining beam 8 and connecting the outer circumferential beam 3 and the supporting beam 4 in the extension by the beam reinforcement structure of the present embodiment, the supporting beam 4, the retaining beam 7 and the retaining beam are connected. Procedure for connecting beam 8 to predetermined position, connecting outer peripheral beam 3 and support beam 4 by connecting member 5, arranging support beam 4 at a predetermined position, and connecting outer peripheral beam 3 and support beam 4 by connecting member 5 The guide beam 7 and the guide beam 8 are arranged at predetermined positions, or the support beam 4, the guide beam 7 and the guide beam 8 are connected on the ground, and the connected support beam 4, the guide beam 7 are connected. And the procedure etc. which arrange | position the stay beam 8 in a predetermined position, and connect the outer periphery beam 3 and the support beam 4 by the connection member 5 are considered.

  The outer peripheral beam 3 and the support beam 4 are connected to each other by the connection member 5, and the connection portion reinforcing plate 6 is joined to the lower side of the connection portion. The shaft connected to the lower part of the connecting portion between the beam 3 and the roof beam 9 is removed. As shown in FIG. 4, the vertical load F borne by the removed shaft acts on the outer beam 3. Deflection is caused in the outer peripheral beam 3, and the torsional moment M <b> 1 due to the vertical load F acts on the cross section of the support beam 4 and tries to cause the support beam 4 to be twisted. However, the rotation of the cross section of the support beam 4 is restricted by the support beam 7 and the support beam 8, and a moment M 2 that resists the torsion moment M 1 acts, so that the support beam 4 is twisted due to the deflection of the outer peripheral beam 3. Can be prevented.

  In FIG. 1, the stay beam 8 is disposed at three locations, but is always disposed at a portion where the existing beam connection portion 14 of the support beam 4 is present, and other than that, with respect to the twist of the support beam 4. Both the number and position are determined by the intensity. In addition, the connection between the end portion of the stay beam 8 and the support beam 4 and the stay receiving beam 7 is not connected via the beam connection plate 10, and a stiffener is provided on the support beam 4 and the stay receiving beam 7. The end portion of the stiffener and the web 35 of the stay beam 8 may be connected using a plate, a bolt, or the like, which is determined by a strength test.

  As described above, according to the beam reinforcing structure according to the first embodiment of the present invention, the outer peripheral beam 3 of the existing building 1 is reinforced by adding the beam type and the column type to the room without extra space. 3 can be removed, and an opening can be widened between the existing building 1 and the extension part 2. Moreover, construction is easy and cost can be suppressed.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, as the present embodiment, the case of extending the one-storied extension part 2 to the outer peripheral surface 2 span of the existing one-story building 1 has been described. However, the beam reinforcing structure according to this embodiment has two or more stories. It is also effective when an extension part 2 of two stories or more is added to the outer peripheral surface 3 span or more of the existing building 1, and an existing building in which the extension part 2 of a one-story building is added to the two-story existing building 1 This is also effective when the number of floors of 1 and extension part 2 are different. Also, when the existing building 1 is extended with an odd number of spans on the outer peripheral surface, or when the span split of the part of the existing building 1 to be extended is not uniform, the outer beam is removed when the shaft supporting the outer beam 3 is removed. The connecting member 5 may be fixed to the portion where the deflection of 3 is maximized, and the support beam 4 may be connected. Moreover, when the span of the part to extend is large, you may connect the outer periphery beam 3 and the support beam 4 not only in one place but in multiple places. If the deflection of the outer peripheral beam 3 due to the vertical load is small even if the shaft supporting the outer peripheral beam 3 is removed and the torsion of the supporting beam 4 is small enough not to cause a problem in structural strength, the auxiliary receiving beam 7 and the auxiliary beam 3 The beam 8 may not be provided. Moreover, although the connection part reinforcement plate 6 was joined to the lower surface of the outer periphery beam 3, and the lower surface of the existing beam connection part 14, the connection part was reinforced, you may join the connection part reinforcement plate 6 also to the upper surface, and may reinforce further. .

Next, a beam reinforcing structure according to a second embodiment of the present invention will be described with reference to the drawings. As the present embodiment, as shown in FIG. 5, a case where a one-storied extension part 2 is extended to the outer peripheral surface 2 span of a one-story existing building 1 will be described. As shown in FIG. 6, the structure of the existing building 1 of this embodiment is different from the first embodiment in that there is no outer peripheral beam 3, and a shaft assembly 36 in which a frame body is formed in a rectangular shape with a lip groove steel. And a frame 37 made of lip channel steel and a shaft assembly 37 formed by a brace made of round steel, turnbuckles, etc., pair the left and right ends of the shed 9 with respect to the shed of the shed 9 I support it.
FIG. 7 shows a schematic configuration of the beam reinforcement structure according to the present embodiment. As shown in the figure, the shed beam 9, the support beam 4, the guide beam 7, the guide beam 8, and the existing building 1 are shown. A pair of connection portion reinforcing members 38a and 38b are mainly configured.

  The hut beam 9 is a horizontal member of H-shaped steel that extends in the direction between the beams on the part of the existing building 1 to be extended. A bolt hole 40 is provided in the lower flange 39 of the shed beam 9, and the connection plate 41 at the end of the shed beam 9 on the extension side corresponds to the bolt hole 23 of the existing beam connection portion 14. Bolt holes 42 are provided. In addition, when the connection plate 41 does not exist in the edge part of the shed beam 9, this connection plate is fixed to the edge part of the shed beam 9 by carrying out field welding.

  The support beam 4 is one of the structural members constituting the shaft assembly on the existing building 1 side of the extension portion 2 and is a wide H-shaped steel horizontal member having a large torsional rigidity. Are arranged at intervals determined by a strength test from the end portion on the extension side of the roof beam 9 in the direction orthogonal to the roof beam 9 at the same height as the lower surface of the roof beam. The beam beam of the support beam 4 is preferably equal to or less than the beam beam of the shed beam 9, and in particular, when the beam beam is the same beam beam as the shed beam 9 and disposed at the same height as the shed beam 9, the existing building 1 and the extension Even if the portion 2 has a plurality of floors, it is easy to align the ceiling height and floor level of the extension portion 2 with the existing building 1, which is preferable. Similar to the first embodiment, both ends of the support beam 4 are received by a beam 13 which is a structural member on the extension side, and the joint between the support beam 4 and the beam 13 is supported by a column (not shown). Is done. Further, the support beam 4 includes an existing beam connection portion 14 protruding from the existing building 1 at a position corresponding to the shed beam 9. The existing beam connection portion 14 has the same configuration as that of the first embodiment, but the protruding length of the existing beam connection portion 14 from the support beam 4 is the same as that of the extension side end portion of the shed beam 9. It is determined by the distance determined by the strength test with the beam 4.

  The back-and-forth beam 7 and the back-and-forth beam 8 have the same configuration as in the first embodiment, and the cross-section of the support beam 4 is formed by the back-and-forth beam 7 and the back-and-forth beam 8 as in the first embodiment. Since the rotation is constrained, it is possible to prevent the support beam 4 from being twisted due to the vertical load acting on the roof beam 9.

  As shown in FIG. 7, the connecting portion reinforcing members 38 a and 38 b are provided on the lower side of the connecting portion between the connecting plate 41 and the existing beam connecting portion 14 in a pair, and the tensile stress applied to the lower side of the connecting portion. It has a symmetrical configuration. The connection portion reinforcing members 38 a and 38 b are joined to the lower surface of the shed beam 9 and the lower surface of the existing beam connection portion 14, and the lower surface of the lower flange 39 of the shed beam 9 and the lower surface plate 17 of the existing beam connection portion 14. Upper surface plates 43a and 43b that are in contact with the lower surface of the upper surface plate, side surface plates 44a and 44b that are fixed vertically downward to the upper surface plate upper surface plates 43a and 43b and that are substantially L-shaped with the upper surface plates 43a and 43b, and upper surface plate 43a, 43b and reinforcing plates 45a, 45b provided at both ends and substantially in the middle of the side plates 44a, 44b. The upper surface plates 43a, 43b include bolt holes 24 and huts on the lower surface plate 17 of the existing beam connecting portion 14. Bolt holes 46a and 46b are provided corresponding to the bolt holes 40 of the lower flange 39 of the beam 9, and bolt holes 47a and 47b are provided in the side plates 44a and 44b, respectively.

  Next, a description will be given of a beam reinforcing method for reinforcing the connecting portion between the cabin beam 9 and the support beam 4 by the beam reinforcing structure according to the second embodiment of the present invention.

  First, the support beam 4 is disposed at a predetermined position on the extension side, and as shown in FIG. 8, the shed beam 9 and the support beam 4 correspond to the existing beam connection plate 15 and the connection plate 41 that are in contact with each other. The bolt hole 23 and the bolt hole 42 provided are fixed by bolting and connected. It should be noted that the guard beam 7 and the guard beam 8 are arranged either before or after the connection of the shed beam 9 and the support beam 4.

  Next, the shaft set 36, which is one of the shaft sets 36 and 37 that support the extension-side end portion of the roof beam 9, which is a pair of left and right with respect to the small opening of the roof beam 9, is removed. At this time, the roof beam 9 is supported by the shaft set 37. 8 and 9A, the upper surface plate 43a of the connecting portion reinforcing member 38a is connected to the lower surface of the lower flange 39 of the shed beam 9 on the side where the shaft set 36 is removed and the existing beam connecting portion 14. Abutting against the lower surface of the lower surface plate 17, the bolt hole 46a of the upper surface plate 43a, the bolt hole 24 of the lower surface plate 17 of the existing beam connecting portion 14 corresponding to the bolt hole 46a, and the bolt hole 40 of the lower flange 39 of the shed beam 9. In step B, the bolts are joined.

  And the shaft set 37 which supports the one side of the edge part of the extension side of the shed beam 9 is removed. Here, the existing shafts 36 and 37 supporting the shed beam 9 are completely removed, but the connecting portion reinforcing member 38a is connected to the lower surfaces of the shed beam 9 and the support beam 4 so that the shed beam 9 and the support beam 9 are supported. 4 is reinforced, and the roof beam 9 is supported by the support beam 4. Then, as shown in FIG. 9B, the upper surface plate 43b of the connection portion reinforcing member 38b is replaced with the lower surface of the lower flange 39 on the side where the shaft set 37 is removed and the lower surface plate 17 of the existing beam connection portion 14. The bolt hole 46b of the upper surface plate 43b, the bolt hole 24 of the lower surface plate 17 of the existing beam connecting portion 14 and the bolt hole 40 of the lower flange 39 of the roof beam 9 corresponding to the bolt hole 46b are bolted. Join with. Finally, as shown in FIG. 9 (c), the bolts 47a and 47b provided in the side plates 44a and 44b where the connecting portion reinforcing members 38a and 38b are in contact with each other are joined by bolting, The connection part of 9 and the support beam 4 is reinforced.

  As described above, according to the beam reinforcing structure and the beam reinforcing method according to the second embodiment of the present invention, the shed beam 9 of the existing building 1 is reinforced without extra beam type and column type in the room. Then, the shaft supporting the shed beam 9 can be removed, and an opening can be widened between the existing building 1 and the extension part 2. Moreover, construction is easy and cost can be suppressed. Further, the shafts 36 and 37 that support the shed beam 9 are removed in order, and the connection portion reinforcing members 38a and 38b are sequentially joined to the lower side of the connection portion between the shed beam 9 and the support beam 4 to reinforce the connection portion. Therefore, the shed beam 9 is always supported during the construction, and the connecting portion between the shed beam 9 and the support beam 4 can be easily and safely installed without separately installing a supporting work for supporting the shed beam 9. Can be reinforced.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, as the present embodiment, the case of extending the one-storied extension part 2 to the outer peripheral surface 2 span of the existing one-story building 1 has been described. However, the beam reinforcing structure according to this embodiment has two or more stories. It is also effective when an extension part 2 of two stories or more is added to the outer peripheral surface 3 span or more of the existing building 1, and an existing building in which the extension part 2 of a one-story building is added to the two-story existing building 1 This is also effective when the number of floors of 1 and extension part 2 are different. In the latter case, not the shed beam 9 but the floor beam is reinforced. Further, if the deflection of the beam 9 due to the vertical load is small even if the shaft supporting the beam 9 is removed, and if the torsion of the beam 4 is small enough not to cause a problem in structural strength, the beam receiving beam 7 and the beam The beam 8 may not be provided.

It is a beam plan view in the beam reinforcement structure concerning a 1st embodiment of the present invention. It is a perspective view which shows schematic structure of the reinforcement structure of the beam which concerns on the 1st Embodiment of this invention. It is A-A 'sectional drawing which shows the connection part of an outer periphery beam and a support beam. It is a schematic diagram which shows the vertical load and moment which act on an outer periphery beam and a support beam. It is a beam plan view in the beam reinforcement structure concerning a 2nd embodiment of the present invention. It is an elevation view which shows the shaft set which supports a pair of right and left ends of a shed beam and the end of the shed beam. It is a perspective view which shows schematic structure of the reinforcement structure of the beam which concerns on the 2nd Embodiment of this invention. It is B-B 'sectional drawing which shows the connection part of a hut beam and a support beam. It is C-C 'sectional drawing which shows the joining procedure of a connection part reinforcement member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing building 2 Extension part 3 Outer periphery beam 4 Support beam 5 Connection member 7 Reservation receiving beam 8 Retention beam 9 Hut beam 38a, 38b Connection part reinforcement member

Claims (5)

In the reinforcing structure of the beam that removes a part of the shaft supporting the outer peripheral beam of the existing building to be expanded and reinforces the outer peripheral beam,
In the structural member on the extension side, the support beam is disposed in the vicinity of the outer peripheral beam at a position where the lower surface is equal to or higher than the lower surface of the outer peripheral beam, and substantially parallel to the outer peripheral beam.
A beam reinforcing structure, wherein the outer peripheral beam and the support beam are connected by a connecting member. In the structural member on the extension side, a guide receiving beam is juxtaposed at the same height as the supporting beam on the side opposite to the outer peripheral beam with respect to the supporting beam,
The beam reinforcing structure according to claim 1, wherein the retaining beam and the support beam are connected by a retaining beam. In the reinforcing structure of the beam that removes the shaft that supports the end of the extension side of the shed beam or floor beam of the existing building to be extended and reinforces the shed beam or floor beam,
The structural member on the extension side is connected to the shed beam or floor beam near the end of the extension side of the shed beam or floor beam at a position where the lower surface of the support beam is higher than the height of the lower surface of the shed beam or floor beam. Arranged in an orthogonal direction,
A beam reinforcing structure in which the shed beam or floor beam is connected to the support beam. In the structural member on the extension side, a guide receiving beam is juxtaposed at the same height as the support beam on the opposite side of the shed beam or floor beam with respect to the support beam,
The reinforcing structure for a beam according to claim 3, wherein the retaining beam and the support beam are connected by a retaining beam. A beam reinforcement method for reinforcing a connection portion between the shed beam or floor beam and the support beam by the beam reinforcement structure according to claim 3 or 4,
Connecting the shed beam or floor beam and the support beam;
Remove one of the shafts supporting the end of the shed beam or floor beam on the extension side with a pair of left and right with respect to the edge of the shed beam or floor beam,
Bonding one of the pair of connecting portion reinforcing members to the lower surface of the side beam of the shed beam or floor beam, and the lower surface of the support beam,
Removing the other of the pair of shafts;
A beam reinforcing method comprising joining the other of the connecting portion reinforcing members to a side of the lower surface of the shed beam or floor beam and support beam from which the shaft group is removed.

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