JP2007162288A - Extension beam and method of reinforcing floor panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extension beam that can reinforce a floor slab by giving required minimum modification to an existing building, and to provide an extension composite beam, a reinforcing structure and a reinforcing method utilizing the extension beam. <P>SOLUTION: The extension beam A comprises a plurality of beam constitutive members 1, 2 constituted to be connectable with mutual overlap parts along almost the same axis. The beam constitutive members 1, 2 arranged at both ends in a longitudinal direction are provided with locking parts 4 locked to existing beams 3, and the beam constitutive members 1, 2 are provided with bolt holes 5 for use in connecting to the other beam constitutive members 1, 2. Two extension beams A are arranged parallel at the existing beams 3 and connected by lateral buckling preventive members 7. Recessed parts 6b are formed at part of support faces of an ALC panel laid over the existing beams 3, and the locking parts 4 of the extension beams A are inserted in the respective recessed parts 6b and locked to the existing beams 3. An opening 21 is formed in the floor panel 6 to insert the extension beams A into an underfloor space 24, and the locking parts 4 are locked to the existing beams 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an additional beam that can reinforce a floor slab by laying on existing beams facing each other in an existing building, and a reinforcing structure of an ALC (lightweight cellular concrete) floor panel using the additional beams. The present invention relates to a method for reinforcing an ALC floor panel using the additional beam.

  In existing buildings that have been in use for a long period of time, the requirements for buildings and spaces generally change from the contents of the new construction. It may change, and inspection and maintenance are necessary to maintain and improve performance. For example, to increase the amount of storage, add underfloor storage, place heavy objects on the floor that were not expected at the time of new construction, and use the underfloor space to inspect and repair buildings. For this purpose, it may be necessary to add an inspection port to the floor.

  In an existing building, increasing the load capacity or adding an opening to the floor lowers the strength and rigidity of the floor slab relative to the design load. It is necessary to improve the rigidity.

  In steel-framed buildings consisting of ALC floor panels whose floor slabs are reinforced with reinforcing bars and lath nets, there is a possibility that future inspections and repairs will be required due to the installation of plumbing equipment and electrical wiring under the floor. In order to provide an opening for inspection in the floor in advance, a frame material for reinforcing the ALC floor panel is installed, and then the ALC floor panel is laid so that the opening is formed. (For example, see Patent Document 1). In this case, the opening is formed in advance at the time of new construction, and the divided ALC floor panel around the opening is supported by the frame material.

  As a technique for improving the strength and rigidity of the existing floor slab, there is a technique described in Patent Document 2, for example. In Patent Document 2, a reinforcing beam is attached to the lower part of an existing horizontal member such as a beam or a floor slab, both ends are fixed between existing vertical members such as columns, and a reaction force is generated between the reinforcing beam and the existing horizontal member. A reinforcing structure is described in which a member is interposed to push up an existing horizontal member by the reaction force member. In this reinforcing structure, the stress applied to the existing horizontal member can be reduced by pushing up the existing horizontal member by the reaction force member.

  Patent Document 3 describes a method for repairing an existing floor in which a fiber-reinforced solidifying material is placed on the upper surface of the existing floor to form a new surface layer. This refurbishment method can improve the strength and rigidity of an aged floor.

JP 2003-247332 A JP 2005-188243 A JP 2002-09797 A

  However, although the technology according to Patent Document 1 is effective when applied to a new building, the existing ALC floor panel already peeled off in an existing building that does not employ such a structure is removed. Therefore, it is necessary to lay the frame material and lay the ALC floor panel corresponding to the shape of the opening, and there is a problem that the floor opening cannot be easily added or reinforced.

  In the technique according to Patent Document 2, the reinforcing beam has a length substantially equal to the span between the existing vertical members, and is configured to be fixed to the side surface of the existing vertical member using an anchor bolt. Therefore, it is necessary to secure a space free of obstacles equal to the span below the beams and floor slabs that need reinforcement, and there is a problem that the ceiling material at the reinforcement site must be removed over the entire span, which is even longer. There is also a problem that a carry-in path for carrying in the reinforcing beams must be secured.

  In the technique according to Patent Document 3, it is necessary to place a fiber-reinforced solidified material over the entire upper surface of the existing floor. When this technology is used to reinforce floor slabs in existing houses, all members including floor base materials and floor finishing materials placed on the top of floor slabs are removed and fiber reinforced solidified materials are used. There is a problem in that it is necessary to place a work and it is unavoidable.

  As described above, there are many problems in using the techniques described in Patent Documents 1 to 3 to improve the strength and rigidity of floor slabs in existing buildings. In particular, when the building is used for a house, there are many obstacles such as partition walls, internal construction materials, equipment piping, and wiring in the room. It will be a thing. For this reason, it is difficult for residents to carry out construction while continuing their lives, and it is necessary to secure temporary housing for the residents during the construction.

  An object of the present invention is to provide an additional beam that can reinforce a floor slab by adding a necessary minimum amount to an existing building, an additional composite beam using the additional beam, a reinforcing structure, and a reinforcing method. It is in.

  In order to solve the above-mentioned problems, the extension beam according to the present invention is an extension beam installed on the existing beam facing each other in the existing building, and is configured to be able to be coupled with each other along substantially the same axis. The beam components that are composed of a plurality of beam components and are arranged at both ends in the longitudinal direction of the additional beam are provided with locking portions for locking to the existing beams at the ends facing the existing beams, respectively. In addition, each of the plurality of beam constituent members is provided with coupling means for coupling with other adjacent beam constituent members.

  In the above-mentioned extension beam, the plurality of beam constituent members are connected to the flange contacting the lower surface of the floor slab installed on the existing beam, and to the other beam constituent members so as to be connected at least at two points in the longitudinal direction. And a web provided with a bolt hole.

  Further, the additional composite beam according to the present invention is constructed so that the two additional beams described in claim 1 or 2 are parallel to each other on the existing existing beam in the existing building, and the two additional beams are provided. Are connected by a lateral buckling prevention member.

  Moreover, the reinforcement structure of the ALC floor panel according to the present invention forms a notch in a part of the support surface of the ALC floor panel laid on the existing beam facing the existing building, and constitutes the additional beam. The locking portions of the plurality of beam constituent members are inserted into the respective notched portions, the locking portions are locked to the existing beams, and the plurality of beam constituent members are coupled to each other to integrate all the beam constituent members. The lower surface of the ALC floor panel is supported by the additional beam.

  In the reinforcing structure of the ALC floor panel, it is preferable that the two additional beams are arranged in parallel and are connected by a lateral buckling prevention member.

  A method for reinforcing an ALC floor panel according to the present invention is a method for reinforcing an ALC floor panel in which openings are provided after both ends are laid on opposite beams in an existing building, The additional beam is inserted into the underfloor space in a non-bonded state through a floor opening formed by cutting out a rectangle parallel to the side of the panel, and the edge of the floor opening is parallel to the span direction of the ALC floor panel. A notch is formed in the support surface of the ALC floor panel on the extension line of the two end edges, and engaging portions of a plurality of beam constituting members constituting the additional beam are inserted into the notch and are engaged with the existing beam. And a plurality of beam components are combined and integrated to support the two edges of the floor opening, and two of the edges of the floor opening that are orthogonal to the span direction of the ALC floor panel A lateral buckling prevention member is attached along the edge of the floor opening. It is characterized in that supporting the other two edges of the floor opening while connecting the two expansion beams and location.

  Further, another ALC floor panel reinforcing method according to the present invention comprises a floor composed of ALC floor panels laid on opposite beams facing each other in an existing building, and below the ALC floor panel. A method of reinforcing the ALC floor panel in a building in which a ceiling space is formed, wherein an opening is formed by notching a ceiling surface corresponding to a position to be reinforced, and the additional beam is not passed through the opening. Inserted into the ceiling space in a coupled state, formed a notch in the support surface of the ALC floor panel, and locked the locking portions of the plurality of beam constituent members constituting the additional beam to the existing beam and a plurality of The beam constituent members are combined and integrated to support the lower surface of the ALC floor panel of the panel.

  The extension beam of the present invention is composed of a plurality of beam constituent members configured to be coupled with each other so as to overlap each other along substantially the same axis, and is locked to the existing beam on the beam constituent members positioned at both ends in the longitudinal direction. A locking portion is provided, and a coupling means for coupling with another beam constituent member is provided. For this reason, the extension beam can correspond to existing beams of various intervals by adjusting the overlap margin of the beam constituent members. Then, both ends are locked to the existing beam, and the adjacent beam components are connected and integrated in the locked state, so that the added beam has the necessary strength and rigidity as a slab reinforcement beam. be able to.

  Therefore, even in an existing building where it is difficult to sufficiently secure a carry-in path for carrying a beam into the underfloor space, by forming an opening to the extent that uncoupled beam components can be carried, An additional beam can be carried into the space under the floor through the opening, placed at the position to be installed, and locked to the existing beam to reinforce the floor slab.

  In the above-mentioned extension beam, a bolt as a coupling means so that the beam component can be coupled at least two points in the longitudinal direction with a flange contacting the lower surface of the member constituting the floor or the ceiling and the other beam component Since the web is provided with holes, the bottom surface of the floor or ceiling can be supported by the flange and the rigidity of the beam component can be improved, and the longitudinal direction using the bolt holes formed in the web It is possible to secure the rigidity of the joint by joining the beam constituent members at two or more points.

  Further, the additional composite beam of the present invention has two additional beams arranged in parallel to the existing beam, and these additional beams are connected by a lateral buckling prevention member, thereby preventing the lateral buckling of the additional beam and allowing the allowable bending stress. Since the beam back can be made smaller under the same conditions, the construction in a narrow under-floor space is facilitated.

  Moreover, in the reinforcement structure of the ALC floor panel of the present invention, a notch is formed in a part of the supported surface of the ALC floor panel installed on the existing beam, and the locking part of the additional beam is inserted into this notch. Thus, the additional beam is locked to the existing beam, and further, the beam constituent members are coupled and integrated with each other, whereby the lower surface of the ALC floor panel can be supported and reinforced. In particular, since the ALC floor panel is easy to process, it is possible to easily cut out only the ALC floor panel without damaging existing beams made of reinforced concrete or steel frames, and it is possible to realize reinforcement by a simple operation.

  In addition, in the reinforcement structure of the ALC floor panel, the two additional beams are locked to the existing beams, and these additional beams are connected by a lateral buckling prevention member, thereby preventing the lateral buckling of the additional beams. ALC floor panels can be reinforced.

  In the reinforcing method of the ALC floor panel provided with the opening which is the reinforcing method of the ALC floor panel according to the present invention, an uncoupled additional beam is inserted under the floor through the opening formed by cutting the ALC floor panel. , Insert the locking part of the beam structural member by cutting out the support surface of the ALC floor panel and lock it to the existing beam, and arrange two additional beams that are integrated by combining the beam structural members, and further expand By arranging two lateral buckling prevention members that connect the beams and supporting the ALC floor panel with these additional beams and lateral buckling prevention members, an opening can be provided without removing the existing floor panel. ALC floor panels can be reinforced.

  In another ALC floor panel reinforcing method according to the present invention, which has a ceiling back space below, an uncoupled beam component member is placed under the floor through an opening formed by cutting the ceiling member. Inserting and inserting the locking part of the beam component member by inserting the locking part of the panel to the existing beam and locking it to the existing beam, and connecting the beam component members of the extension beam together in the ceiling space By constructing an additional beam, the ALC floor panel can be reinforced by processing the ceiling material of the minimum necessary size.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the expansion beam, the expansion composite beam, the ALC floor panel reinforcement structure, and the ALC floor panel reinforcement method of the present invention will be described below.

  The extension beam of the present invention is configured to be able to exhibit strength and rigidity by being locked to and integrated with existing beams arranged opposite to each other in an existing building. And when constructing an opening such as an underfloor inspection opening on the floor of an existing building or performing a modification that increases the load capacity on the floor, the strength and rigidity are relatively reduced with the modification. It reinforces the falling floor. In particular, by forming a relatively small opening in the floor or ceiling so that the additional beam can be inserted under the floor, the work to reinforce the target floor can be performed without removing the floor slab. Is.

  In the present invention, the structure and material of the floor slab are not particularly limited, and it is constructed by using wood, concrete slab, ALC panel or PC (precast concrete) panel. Any structure such as the above can be dealt with.

  The extension beam of the present invention is configured by a plurality of beam components that are configured to be coupled with each other along the same axis, and is opposed to the existing beams of the beam components arranged at both ends in the longitudinal direction. The end portion is provided with a locking portion to be locked to the existing beam, and each beam constituent member is provided with a coupling means for coupling with another adjacent beam constituent member.

  The material which comprises a beam structural member is not limited, A timber and a metal material can be utilized. However, in order to effectively reinforce the floor with a light weight and a small cross-sectional area, a metal material, particularly a steel material, is preferable. Such steel materials include steel materials such as heavy-weight steel and light-weight steel, but steel materials obtained by bending a steel plate are particularly preferable.

  The plurality of beam constituent members are configured to be coupled with each other with overlapping portions along substantially the same axis. A structure in which a plurality of beam constituent members are coupled is not particularly limited. For example, a bolt hole is formed in each beam constituent member along an axis, and a plurality of beam constituent members are aligned in parallel and bolts are aligned. It is possible to couple | bond a some beam structural member along the same axis | shaft by cooperating with a shaft-shaped member and a bolt hole so that it can insert and couple | bond. In addition, it is preferable that it is a shape which can adjust the coupling position to the axial direction including a long hole as a bolt hole.

  In addition, each beam component has a similar cross-section and is configured so that the size decreases in the order toward the center of the span. A plurality of beam constituent members can be coupled along substantially the same axis by fitting the beam constituent members having small dimensions into the members.

  In the above case, the cross-sectional shape of each beam constituent member is such that one side in the horizontal direction is completely open like an L-shaped mountain shape or a U-shaped groove shape, and the beam constituent member is horizontal in the overlapping portion. Removable in the direction and the open direction, that is, not restricted by the movement in the horizontal direction, and in the direction other than the longitudinal direction in the overlapping part such as C-shaped lip groove type or square steel pipe It is considered that it is impossible to leave.

  In the case of the former, each beam constituent member can be separated and carried into a portion that needs reinforcement, and the overlapping portions can be brought close to each other in the lateral direction and joined together. In addition, if measures to prevent variation at the time of carry-in are taken with a band or the like, each beam component is fitted in a predetermined order in advance, and is carried into a portion requiring reinforcement in a reduced state, and the beam component in a reduced state Can be coupled after being stretched to a predetermined length.

  In the latter case, the beam components are fitted in a predetermined order in advance, and are transported to a site requiring reinforcement in a contracted state, and the contracted beam component is slid and extended to a predetermined length. It is possible to adopt only the method of combining with.

  In the case of an expanded beam configured to allow multiple beam components to slide along substantially the same axis, the overall length of the expanded beam can be adjusted to adjust the span of the existing beam by adjusting the overlapping margin of the multiple beam components. It is configured to correspond. Further, the total length of the additional beam can be adjusted by increasing or decreasing the number of beam constituent members constituting the additional beam.

  The length and number of beam components are not particularly limited. The distance between existing beams arranged in an existing building, the size of openings formed in the floor or ceiling, the space under the floor or the back of the ceiling. It is preferable to set in consideration of dimensions such as the height of the space. In particular, if the existing building is an industrialized house, the distance between the existing beams, the height of the underfloor space, and the height of the ceiling space are modularized or standardized. It is possible to deal with many patterns with few varieties.

  The structure of the locking portion for locking the additional beam to the existing beam is not particularly limited, and is preferably set as appropriate according to conditions such as the shape and structure of the existing beam and the material of the floor slab. For example, when the existing beam is H-shaped steel, it is preferable that the locking portion has a locking piece that is locked so as to be caught by a flange of H-shaped steel. When the existing beam is a square steel pipe or wood, the locking part may be a square steel pipe or a locking part having a locking piece that is locked so as to be caught on the top surface of the wood. It may be a locking part having a locking piece that is screwed to the side surface and locked.

  In particular, when the floor slab is made of a material that can be easily processed, such as an ALC panel, it is easy to process a notch in a portion of the floor slab placed on an existing beam. It is possible to easily form a space for inserting the locking piece. For this reason, when the floor slab is made of a material with good workability, the locking portion preferably has a locking piece that is hooked on the upper surface of the existing beam.

  The coupling means for coupling and integrating the beam components that make up the additional beam is not particularly limited in structure, and it is possible to smoothly integrate force between adjacent beam components and smoothly transmit force. If it is good. Bolts and nuts that can perform such functions can be combined by simply inserting and tightening them into bolt holes that have been drilled in advance. It is preferable because it is easy to work in a narrow space such as the back, and does not require excessive equipment or fire.

  The beam constituting the additional beam has a flange that contacts the lower surface of the floor slab and a web provided with a bolt hole through which a bolt as a coupling means is inserted. It is preferable that the shape is similar and the outer dimension of one beam component is slightly smaller than the inner dimension of the other beam component. With this configuration, the vertical play at the overlapping portion is reduced, and even if it is in a non-coupled state, it is stable to some extent, so there is no need to keep the beam component during operation, and the bolt holes can be easily aligned. Therefore, the joining work becomes easy.

  When connecting adjacent beam constituent members, it is preferable to connect at least two bolts having a predetermined interval in the longitudinal direction, and in particular, two bolts having a predetermined interval in the longitudinal direction are connected in the vertical direction. It is preferable to connect with four bolts arranged in a row. For example, when one bolt is used, two beam constituent members to be integrated are refracted with the bolt as a fulcrum, and there is a possibility that the floor slab cannot be sufficiently supported by the additional beam. Further, when the number of bolts is increased, the operation becomes complicated and the operation time may be extended. Therefore, by connecting adjacent beam constituent members with two to four bolts, it is possible to reliably reinforce the floor slab with the additional beams, and there is no adverse effect due to the complexity of the work.

  When the lower surface of the floor slab is supported by the additional beam integrated by combining adjacent beam structural members as described above, the beam supporting structural member constituting the additional beam should be in contact with the entire lower surface of the floor slab. There is no gap between the beam component contained in the other beam components and the floor slab. In this case, a plate-like or L-shaped liner plate is prepared, and the liner plate is arranged on the upper surface of the beam constituent member included in another beam constituent member, so that the load is passed through the liner plate. It is preferable to be configured so that the transmission can be performed.

  The position and number of bolt holes provided in the web are preferably set in advance. In order to increase the versatility of the additional beams, it is preferable to assume a pattern of the spacing dimension of the existing beams facing each other in advance so that the assumed case can be handled. For example, if both ends of the extension beam are hooked and locked on the upper surface of the existing beam, the distance between the existing beams facing each other is the internal dimension of the existing beam, so the module dimensions set for the building The position and number of bolt holes should be set so that they can correspond to the pattern of the length of the additional beam generated by the combination of the existing beam core-core spacing pattern and the existing beam width pattern. Is preferred.

  When the floor slab is supported by installing on the existing beam facing the additional beam, bending stress acts on the additional beam, so that the additional beam may be laterally buckled and deformed. For this reason, in the additional composite beam of the present invention, two additional beams are installed on the existing beam so that they are parallel to each other, and these two additional beams are connected by a lateral buckling prevention member, thereby generating lateral buckling. Is preventing.

  The shape and dimensions of the lateral buckling prevention member are not particularly limited, and are preferably set to shapes and dimensions that can connect two additional beams to counter lateral buckling acting on these additional beams. . For example, by setting the interval between two additional beams in advance to a certain size, welding pieces attached to the web of the additional beam are welded to both ends of a steel material having a certain length, or both ends of the steel material are bent. By doing so, it is possible to configure a lateral buckling prevention member.

  The lateral buckling prevention member also has a function of correcting the positions of the two additional beams that are likely to vary in installation position due to field work. For example, one additional beam can be automatically placed at a predetermined position by accurately installing one additional beam at a predetermined position and connecting it to the other additional beam with a lateral buckling prevention member.

  In addition, when it is not necessary to set the positions of the two additional beams strictly, the lateral buckling prevention member is divided into a plurality of members, and elongated bolt holes are formed in the overlapping portions thereof. It is also possible to absorb the deviation by adjusting the overlap margin according to the separation distance of the additional beams and fixing the bolts.

  Further, the number of the lateral buckling prevention members is not particularly limited, and it is possible to prevent the lateral buckling of the additional beams by connecting the centers of the additional beams with one lateral buckling prevention member. Further, when the extension beam is long, two or more lateral buckling prevention members can be used.

  When the floor slab is an ALC panel, since the ALC panel is excellent in workability, a part of the surface placed on the existing beam is cut using a drill or the like, and a locking portion provided on the additional beam is provided. It is possible to form a notch for insertion. The processing accuracy of the notched portion is not strict, and it is only necessary that the locking portion can be simply inserted and locked to the upper surface of the existing beam. Therefore, by using an electric drill that can be operated with one hand, it is possible to form a notch in the ALC panel without damaging the flange of the existing beam.

  Next, the configuration of the additional beam will be described with reference to the drawings. FIG. 1 is a diagram for explaining the configuration of an additional beam A according to the first embodiment.

  In the figure, the extension beam A has a plurality of beam constituent members 1 and 2 and faces the existing beam 3 of the beam constituent members 1 and 2 arranged at both ends in the longitudinal direction of the extension beam A. A locking portion 4 is provided at the end, and a bolt hole 5 serving as an integration means with another adjacent beam constituent member is provided.

  Each beam component 1, 2 is configured as a grooved steel whose cross-sectional shape is U-shaped, and the required strength as an additional beam to reinforce the members constituting the floor or roof is set to a dimension that can exhibit rigidity And have upper flanges 1a and 2a, lower flanges 2b and 2b, and webs 1c and 2c, respectively. The internal dimensions of the upper and lower flanges 1a and 1b in the beam component 1 and the outer dimensions of the upper and lower flanges 2a and 2b in the beam component 2 are substantially equal or slightly smaller. Configured. Moreover, the width dimension of each flange 1a, 1b, 2a, 2b is set to the mutually equal value. Therefore, the cross-sectional shapes of the beam constituent members 1 and 2 are similar to each other.

  When the beam component 2 is mounted between the flanges 1a and 1b of the beam component 1, it can be coupled so as to be wrapped by the flanges 1a and 1b and the web 1c. In this way, when the beam component 2 and the beam component 1 are coupled to each other, the coupling surfaces of the beams become the flanges 1a and 2a, so the shafts 1d and 2d when sliding are connected to the flanges 1a, 1b and 2a. 2b. In the front view of FIG. 1A, the shafts 1d and 2d of the two structural members 1 and 2 overlap each other. However, since the webs 1c and 2c overlap in the beam component 1 and the beam component 2, as shown in FIG. 5B, the plane is substantially flat by a value slightly larger than the thickness of the webs 1c and 2c. Will be misaligned.

  In the present invention, it is assumed that a plurality of beam constituent members are configured to be coupled along substantially the same axis with the structure of the additional beam as described above. However, when a plurality of beam constituent members are configured by using a steel shape such as a steel pipe or a lip groove shape steel, each beam constituent member is configured to be coupled along the same axis. .

  In this embodiment, the outer dimension between the upper and lower flanges 1 a and 1 b of the beam component 1 is larger than the outer dimension between the upper and lower flanges 2 a and 2 b of the beam component 2. For this reason, when the additional beam A is bridged over the existing beam 3, the upper flange 1a of the beam component 1 has a function as a beam component that supports by directly contacting the lower surface 6a of the floor panel 6 made of ALC. The beam constituting member 2 exhibits a function as a beam constituting member by indirectly contacting through a liner plate inserted in a gap with the lower surface 6a of the floor panel 6.

  In this embodiment, the existing beam 3 is composed of an H-shaped steel having an upper flange 3a, a web 3b, and a lower flange.

  A locking portion 4 is formed at the ends of the beam constituent members 1 and 2 and is configured to be placed and locked on the upper flange 3a of the existing beam 3. For this reason, the latching | locking part 4 is comprised by the L-shaped steel material which has the latching piece 4a mounted in the upper flange 3a, and the fixed piece 4b fixed to the edge part of the beam structural members 1 and 2. As shown in FIG. ing. The fixing pieces 4b are respectively attached to the end portions of the beam constituent members 1 and 2 serving as the beam constituent members disposed at the end portion of the additional beam A by, for example, welding. As for the latching | locking part 4 formed in the edge part of the beam structural members 1 and 2, the lower surface 4c of each latching piece 4a becomes a surface mounted in the upper flange 3a of the existing beam 3. FIG.

  The locking portion 4 formed on the beam constituting member 1 has a surface 4c arranged on the same plane as the upper surface of the upper flange 1a, and the locking portion 4 formed on the beam constituting member 2 has a surface 4c on the upper flange 2a. It arrange | positions in the position which becomes higher by the plate | board thickness of the upper flange 1a of the beam structural member 1 rather than the upper surface. That is, the surface 4c of the locking portion 4 is arranged at the same level regardless of the number of beam constituent members constituting the additional beam A, and holds the beam constituent members horizontally.

  The bolt hole 5 is formed by a hole such as a circle or a long hole, and is arranged at a preset pitch at a position that is distributed up and down around the shafts 1d and 2d with respect to the webs 1c and 2c of the beam constituent members 1 and 2. A plurality are formed. As described above, the position of the bolt hole 5 is set in accordance with the variations of the module dimension and the width dimension of the existing beam in the existing house that is symmetric, and is not uniquely set.

  Next, another embodiment of the extension beam will be described. FIG. 2 is a diagram for explaining another embodiment of the additional beam. FIG. 3 is a view for explaining still another embodiment of the extension beam. In the drawing, the same reference numerals are given to the same parts and the parts having the same functions as those of the above-described embodiment, and the description thereof is omitted.

  The additional beam shown in FIG. 2 (a) has beam components 1, 9, and 10 that can directly support the floor panel with the upper flange, and a beam configuration that can indirectly support the floor panel with the upper flange via the liner plate. The beam component members 1, 8, 9, 8, and 10 are alternately arranged.

  Further, the additional beam shown in FIG. 5B includes beam constituent members 1 and 10 that can directly support the floor panel with a flange, and a beam constituent member 8 that can indirectly support the floor panel with the flange via a liner plate. , And are arranged in the order of the beam constituent members 1, 8, and 10.

  The beam constituent members 8 to 10 are each made of a steel material having a U-shaped cross section having upper flanges 8a to 10a, lower flanges 8b to 10b, and webs 8c to 10c. These are configured to have the same relationship as that of the beam constituent members 1 and 2 described above. Each of the webs 8c to 10c is formed with a bolt hole 5 for connecting and integrating with other adjacent beam constituent members.

  In each of the additional beams, each of the beam constituent members 1 and 10 has a locking portion 4 formed at the end thereof, and is locked to the existing beam 3 facing the existing house. Therefore, the beam constituent members 1 and 10 are configured to be different from each other and can be bridged by locking the locking portion 4 to an existing beam (not shown). Then, after the beam constituent members 1 and 10 are bridged over the existing beams, the bolts 5 formed in the webs 1c and 8c to 10c are used to be coupled with other adjacent beam constituent members so as to be integrated. It is configured.

  Note that movement of the overlapping portion in a direction other than the direction along the axis is restricted by a band or the like so that the beam constituent members do not vary during the operation.

  In each additional beam configured as described above, a plurality of beam constituent members 1, 8, 9, and 10 are extended by sliding along substantially the same axis in the same manner as the above-described additional beam A, and the beam constituent member 1 It is possible to construct an additional beam by locking 10 to an existing beam and combining it with another adjacent beam component. In particular, since the beam constituent members 1, 9, and 10 are configured to contact the lower surface of the floor panel and can be intermittently supported, a liner plate is inserted between the upper flange of the beam constituent member 8 and the floor panel. Without this, stable support can be realized.

  It should be noted that a liner plate is appropriately inserted between the upper flange of the beam component 8 and the floor panel in accordance with the distance between the beam components 1, 9, 10 to increase the contact area and improve the stability. Is possible.

  Next, the additional beam B shown in FIG. 3 includes a plurality of beam components 1, 8, 10, 11a to 11c having a U-shaped cross section, and the beam components 11a to 11c. Is configured such that the outer dimension between the flanges becomes smaller in order according to the plate thickness. That is, the beam constituent members 11a to 11c are configured to have the same relationship as the relationship between the beam constituent members 1 and 2. Accordingly, the beam constituent members 8 and 11a to 11c are configured such that the height of the upper flange is sequentially reduced by the thickness of the flange.

  The extension beam B configured as described above can be expanded and contracted as shown in FIGS. 4A to 4E, and has a great ability to cope with a change in the span of the existing beam. That is, it can be used as an extension beam B having high versatility. In this extension beam B, only the beam components 1 and 10 can directly contact the lower surface of the floor panel to support the floor panel. For this reason, for example, as shown to the same figure (a)-(c), the beam structural member which does not contact the lower surface of a floor panel will increase as the length of the extension beam B becomes long.

  In this case as well, the thickness corresponding to the difference from the upper surface of the upper flanges of the beam constituent members 8 and 11a to 11c to the upper surfaces of the upper flanges 1a and 10a of the beam constituent members 1 and 10 is provided. After preparing the liner plate and bridging the additional beam B over the existing beam (not shown), all or part of the gap between the floor panel and the upper flanges of the beam constituent members 8 and 11a to 11c corresponds to the gap. The floor panel can be supported also by the beam constituent members 8 and 11a to 11c by inserting a liner plate having a thickness to be used.

  Next, a procedure for reinforcing an ALC floor panel by extending an extension beam over existing beams facing each other in an existing building will be described, and an example of a reinforcing structure will be described at the same time. FIG. 4 is a diagram schematically illustrating a procedure for forming a notch in the floor panel and bridging the additional beam. FIG. 5 is a front view for explaining a reinforcing structure for reinforcing the floor panel. FIG. 6 is a side view of FIG.

  As shown in FIG. 4, both end portions of the floor panel 6 are placed on the upper flange 3a of the existing beam 3 made of opposed H-shaped steel. The floor panel 6 is composed of an ALC panel.

  First, a notch 6b for inserting the locking portion 4 of the additional beam A is formed in the portion of the lower surface 6a of the floor panel 6 that is placed on the upper flange 3a of the existing beam 3. The formation method of the notch 6b is not particularly limited, and can be formed using a lifting tool such as only, and is formed by cutting with a drill 13a attached to the electric drill 13. Is also possible. Since the floor panel 6 is composed of an ALC panel, the floor panel 6 can be easily processed, and the notch 6b can be formed in a short time even when the cut 13a is used. Further, the existing beam 3 that supports the floor panel 6 made of an ALC panel is generally a steel beam or RC foundation beam as shown in FIG. 4, and has a very high hardness as compared with ALC. Therefore, it is extremely unlikely that the existing beam 3 will be accidentally cut out during the cut-out operation of the floor panel 6, and the work can be performed with peace of mind. In addition, the notch | incision part 6b should just be a magnitude | size which can insert the latching piece 4a of the latching | locking part 4 provided in the both ends of the additional beam A, and can be hooked on the upper flange 3a of the existing beam 3. FIG.

  Next, the additional beam A is carried into the under-floor space or the ceiling space formed at the lower part of the floor panel 6. At this time, the beam constituent members 1 and 2 constituting the additional beam A may be carried individually. Further, depending on the size of the loading path or the opening of the floor or ceiling, the flanges 1a, 1b, 2a, 2b, the webs 1c, 2c are brought into a contracted state by being overlapped with each other. 2 are slid along the axes 1d and 2d so that the beam constituent members 1 and 2 arranged at both ends are opposed to the existing beam 3, respectively.

  Next, the locking piece 4a of the locking portion 4 provided at the end of one of the beam constituent members, for example, the beam constituent member 1, is inserted into the notch portion 6b, and the other beam constituent member, for example, the end of the beam constituent member 2 is inserted. The locking piece 4a of the locking part 4 provided in the part is inserted into the notch 6b. For example, when the beam constituent members 1 and 2 are carried separately, the flanges and the webs are overlapped after the locking portions 4 of the respective beam constituent members 1 and 2 are inserted into the notches 6b. combine. Further, when the beam constituent members 1 and 2 are brought into a contracted state by being overlapped with each other, the respective beam constituent members 1 and 2 are extended while sliding and extending the beam constituent members 1 and 2 along the axes 1d and 2d. The two locking portions 4 are inserted into the notched portions 6b.

  Next, the beam constituting members 1 and 2 are pushed in the direction of the existing beam 3 facing each other to fully engage the locking piece 4a with the upper flange 3a, and as shown in FIG. 5, formed on the webs 1c and 2c. The additional beam A can be configured by inserting the bolts 15a into the four bolt holes 5 selected from the bolt holes 5 and connecting and integrating the nuts 15b.

  In the additional beam A configured as described above, the upper flange 1a of the beam component 1 is in contact with and supported by the lower surface 6a of the floor panel 6, but the upper flange 2a of the beam component 2 is connected to the lower surface 6a of the floor panel 6. A gap occurs without contact. Therefore, the liner plate 16 having a thickness equal to the thickness of the upper flange 1a of the beam component 1 (equal to the thickness of the upper flange 2a of the beam component 2) is inserted into the upper flange 2a of the beam component 2. Then, the gap formed between the lower surface 6a and the lower surface 6a is filled to support the floor panel 6 by indirectly contacting the upper flange 2a of the beam component 2 with the lower surface 6a of the floor panel 6 through the liner plate 16. Is possible.

  The number of liner plates 16 to be arranged on the additional beam A is not limited, and depends on the length of the beam component 2 (the length of the non-contact portion with respect to the lower surface 6a of the floor panel 6) and the assumed load. It is preferable to set the number appropriately.

  The liner plate 16 may be simply a flat plate, but the beam plate 5 is made of a bolt hole 5 provided in the web 2c of the beam component 2 so that the liner plate 16 does not fall even when subjected to external vibration. It is preferable to configure so as to be fixed to the component member 2. For this reason, in this embodiment, the liner plate 16 is formed in an L shape, one piece of the L shape is used as a liner piece 16a, and the other piece is formed as a fixed piece 16b attached to the web 2c.

  The additional beam A is configured as described above, and the liner plate 16 is sandwiched in the gap formed between the lower surface 6a of the floor panel 6 and the upper flange 2a of the beam structural member 2, thereby lowering the lower surface of the floor panel 6. It is possible to reliably support and improve the strength and rigidity of the floor. That is, it is possible to reinforce the floor panel 6 made of an ALC panel with one additional beam A.

  Next, the configuration of the additional composite beam configured to prevent buckling of the additional beam A and the reinforcing structure of the ALC panel using the additional composite beam will be described with reference to FIGS. 5 and 6.

  As shown in FIGS. 5 and 6, the two additional beams A are arranged in parallel so that the webs 1c and 2c of the beam constituent members 1 and 2 can face each other, and hang over the existing beams 3 facing each other. By passing and connecting these additional beams A by a lateral buckling prevention member 17 that prevents lateral buckling, it is possible to prevent lateral buckling that may occur due to bending stress acting on each additional beam A.

  The lateral buckling prevention member 17 includes a fixed piece 17a fixed to the webs 1c and 2c of the beam constituting members 1 and 2 constituting each additional beam A, and a long hole standing upright at a predetermined position from the fixed piece 17a. And an L-shaped member having a connecting piece 17b provided with 17c. The fixing pieces 17a are fixed to the opposing positions of the webs 1c and 2c in the two additional beams A by bolts 15a and nuts 15b, respectively, and the connecting pieces 17b are overlapped with each other, and the length provided on the connecting pieces 17b The bolts 15a are inserted into the holes 17c and the nuts 15b are fastened to allow connection.

  The number of lateral buckling prevention members 17 that connect the two additional beams A is not limited, and the cross-sectional performance of the additional beams A, the magnitude of the bending stress acting on the additional beams A, the length of the additional beams A, etc. It is preferable to set the number appropriately according to the conditions. Further, the shape of the lateral buckling prevention member 17 is not limited to the present embodiment, and it is natural that the lateral buckling prevention member 17 may be configured using, for example, a grooved steel, an angle steel, or a steel pipe similar to the beam constituting member.

  Next, the method for reinforcing a floor panel provided with an opening when an opening is provided on the floor of an existing building made of an ALC panel to perform inspection under the floor or when storage under the floor is configured will be described with reference to the drawings. explain. FIG. 7 is a diagram for explaining a procedure when an additional beam is carried under the floor using an opening formed in the floor. FIG. 8 is a development explanatory view of additional beams and members that reinforce the floor panel around the floor opening. FIG. 9 is a diagram illustrating a structure for reinforcing a floor panel.

  The floor panel 6 made of an ALC panel is laid between an existing beam 3 made of H-shaped steel and a concrete foundation beam 22, and the foundation beam 22 has an underfloor ventilation port 23 (see FIG. 8). Yes.

  The floor finishing material and the wall surface arranged around the opening 21 to be formed on the floor are cured, and a marking line corresponding to the opening to be formed on the upper surface of the floor finishing material is drawn. Thereafter, the floor finishing material and the floor panel 6 are cut by moving the electric saw or the like along the scribing line to form an opening 21 penetrating into the underfloor space 24 as shown in FIG.

  The expanded beam A reduced in advance is inserted into the underfloor space 24 through the opening 21. For this reason, the length of the extension beam A and the dimension of the opening 21 when reduced to the shortest are set according to conditions such as the height dimension of the underfloor space 24. Therefore, when it is desired to reduce the size of the opening 21, it is necessary to shorten the reduction length of the additional beam A.

  In particular, depending on the relationship between the size of the opening 21 and the height of the underfloor space 24, it may be preferable to use the additional beam B.

  A worker enters the underfloor space 24 and receives a predetermined number (two) of additional beams A inserted from the upper side of the floor panel 6, and further, necessary members (a support member 25, a connecting member 26 shown in FIG. 8, Frame 27, liner 16 and the like) and receive them in the underfloor space 24.

  The support member 25 is used when the additional beam A is applied to the underfloor ventilation port 23 formed in the foundation beam 22, and as shown in FIG. The mounting surface 25a is configured to be flush with the upper surface 22a of the foundation beam 22 while being locked to the upper surface 22a of the foundation beam 22. By attaching the support member 25 to the underfloor ventilation port 23, the placement surface 25 a can be made continuous with the upper surface 22 a of the foundation beam 22 regardless of the presence of the underfloor ventilation port 23.

  The connecting member 26 has a function of connecting the webs 1c and 2c of the two additional beams A and maintaining a constant distance even when an external force is applied to these additional beams A. A main body piece 26a having a length set correspondingly, a fixing piece 26b attached to the opposing webs 1c and 2c formed at both ends of the main body piece 26a, and a bolt hole 26c provided in the fixing piece 26b. It is configured.

  The frame 27 is disposed along the edge of the opening 21 formed on the floor, and supports and supports an opening frame (not shown) disposed around the opening 21 and supports the lower surface 6a of the floor panel 6 in contact therewith. A support piece 27a configured in a square frame shape having a size larger than the size of the opening 21 in advance, and a fixed piece 27b attached to the webs 1c and 2c of the additional beam A. It is configured.

  Reference numeral 28 denotes a protective member placed on the upper surface of the support piece 27 a of the frame 27.

  First, the worker who has entered the underfloor space 24 is a portion facing the upper flange 3a of the existing beam 3 on the lower surface 6a of the floor panel 6 and on the extension line of the edge of the opening 21 using an electric drill or the like. The notch part is formed.

  Next, the additional beam A is arranged along the edge of the opening 21, and the locking pieces 4 a of the locking portions 4 provided at both ends are inserted into the notched portions 6 b to connect the beam constituent members 1 and 2 to the existing beams 3. The upper flange 3a, the upper surface 22a of the foundation beam 22, and the mounting surface 25a of the support member 25 are respectively locked. In this state, the beam components 1 and 2 are temporarily fixed to each other by using bolt holes 5 provided in the webs 1c and 2c.

  With the two additional beams A temporarily fixed, the liner 16 is disposed on the upper surface of the upper flange 2 a of the beam component 2, and the frame 27 is disposed at a position corresponding to the opening 21. Then, connecting members 26 are arranged in the vicinity of the existing beam 3 and the foundation beam 22 of the two additional beams A, and are fixed to the webs 1c and 2c. At this time, the position of the additional beam A with respect to the opening 21 is adjusted. Similarly, the position of the frame 27 is adjusted to correspond to the opening 21 to firmly fix the beam constituent members 1 and 2 constituting each additional beam A to each other. Secure to.

  The opening 21 formed in the floor panel 6 as described above can be reinforced by the two additional beams A and the frame 27. In this embodiment, the frame 27 can exhibit a function as a lateral buckling prevention member.

  Next, a method for reinforcing a floor panel made of an ALC panel on the upper floor using the ceiling space will be described with reference to the drawings. FIG. 10 is a diagram illustrating a procedure for reinforcing the floor by forming an opening in the ceiling and carrying an additional beam into the space behind the ceiling.

  As shown in the figure, an opening 31 is formed in the ceiling 30. The size of the opening 31 is such that the extension beam A can be inserted and an operator can mount the extension beam A by using the stepladder and scaffolding to get the upper body into the ceiling space. It is necessary to be. In addition, the position of the opening needs to be a position where the worker can get into the existing beam by getting into the upper body. If the total length of the floor panel (the span of the existing beam) is about 1.8 m, it is possible to work sufficiently by providing one opening in the center.

  First, the upper body is put in from the opening 31 formed in the ceiling 30, and the notch 6 b is formed by using an electric drill or the like on the lower surface 6 a of the floor panel 6 and corresponding to the upper flange 3 a of the existing beam 3. To do. The extension beam A is inserted into the ceiling space 32 from the opening 31, and the locking piece 4a of the locking portion 4 provided on the beam constituent members 1 and 2 constituting the extension beam A is inserted into the notch 6b. The existing beam 3 is locked to the upper flange 3a. Thereafter, the bolt 15a is inserted into the bolt holes 5 provided in the webs 1c and 2c of the beam constituent members 1 and 2, and the nut 15b is fastened and joined to be integrated, thereby reinforcing the floor panel 6 with the additional beam A. Is possible.

  In each of the above-described embodiments, the notch 6b is formed in the portion of the lower surface 6a of the floor panel 6 facing the upper flange 3a of the existing beam 3 and the locking piece 4a of the locking portion 4 is inserted. Thus, the locking piece 4a can be locked to the upper flange 3a. Since the notched portion 6b formed in the floor panel 6 does not significantly affect the strength and rigidity of the floor even if it remains as it is, it is not necessary to perform a special post-treatment. However, it is natural that there is no problem even if the notch 6b is filled by filling with mortar or the like.

  The extension beam of the present invention and the reinforcing structure using the extension beam can be preferably used for a floor composed of materials such as an ALC panel, a PC panel, a concrete slab, and wood.

It is a figure explaining the structure of the extension beam which concerns on 1st Example. It is a figure explaining the other Example of an extension beam. It is a figure explaining other Example of an additional beam. It is a figure which illustrates typically the procedure which forms a notch part in a floor panel and bridges an additional beam. It is a front view explaining the reinforcement structure which reinforces a floor panel. FIG. 6 is a side view of FIG. 5. It is a figure explaining the procedure at the time of carrying in an additional beam under a floor using the opening formed in the floor. It is expansion | deployment explanatory drawing of the additional beam and member which reinforce a floor opening part. It is a figure explaining the structure which reinforces a floor opening part. It is a figure explaining the procedure at the time of forming an opening in a ceiling and carrying in an additional beam in a ceiling back space, and reinforcing a floor.

Explanation of symbols

A, B Additional beams 1, 2 Beam components 1a, 2a Upper flange 1b, 2b Lower flange 1c, 2c Web 1d, 2d shaft 3 Existing beam 3a Upper flange 3b Web 4 Locking portion 4a Locking piece 4b Fixed piece 4c Surface 5 Bolt hole 6 Floor panel 6a Lower surface 6b Notch 8-10 Beam component 8a-10a Upper flange 8b-10b Lower flange 8c-10c Web 11a-11c Beam component 13 Electric drill 13a Drill 15a Bolt 15b Nut 16 Liner plate 16a Liner piece 16b Fixed piece 17 Lateral buckling prevention member 17a Fixed piece 17b Connection piece 17c Elongated hole 21 Opening 22 Foundation beam 22a Upper surface 23 Underfloor ventilation port 24 Underfloor space 25 Support member 26 Connecting material 27 Frame 25a Mounting surface 26a Main body piece 26b Fixed piece 26c Bolt hole 27a Support Piece 27b Fixed piece 28 Protective member 30 Ceiling 31 Opening 32 Ceiling back space

Claims (7)

An extension beam built on existing beams facing each other in an existing building, consisting of a plurality of beam components that can be joined together with overlapping portions along substantially the same axis, and the longitudinal direction of the extension beam Each of the beam constituent members disposed at both ends is provided with an engaging portion for engaging with the existing beam at an end portion facing the existing beam, and another adjacent to the plurality of beam constituent members. An additional beam characterized in that a coupling means for coupling with a beam component is provided. The plurality of beam constituent members are provided with a flange that comes into contact with the lower surface of the floor slab installed on the existing beam, and bolt holes as connecting means so that the other beam constituent members can be connected at least at two points in the longitudinal direction. The extension beam according to claim 1, further comprising a web. The two additional beams described in claim 1 or 2 are installed on the existing beams facing each other in an existing building so that they are parallel to each other, and the two additional beams are connected by a lateral buckling prevention member. A featured extension composite beam. A plurality of beam configurations constituting an extension beam according to claim 1 or 2, wherein a notch is formed in a part of a support surface of a lightweight cellular concrete floor panel laid on existing beams facing each other in an existing building. A locking portion of a member is inserted into each notch portion, the locking portion is locked to an existing beam, and a plurality of beam constituent members are coupled to each other to integrate all the beam constituent members, and the additional beam A reinforcement structure for a lightweight cellular concrete floor panel, wherein the lower surface of the lightweight cellular concrete floor panel is supported by The lightweight expanded concrete floor panel according to claim 4, wherein two additional beams according to claim 1 or 2 are arranged in parallel, and the two additional beams are connected by a lateral buckling prevention member. Reinforced structure. A method of reinforcing a lightweight cellular concrete floor panel with openings provided after both ends are laid on existing beams facing each other in an existing building, and cut into a rectangle parallel to the sides of the lightweight cellular concrete floor panel The extension beam according to claim 1 or 2 is inserted into the underfloor space in a non-bonded state through the floor opening formed in a lack, and the edge of the floor opening is parallel to the span direction of the lightweight cellular concrete floor panel. A notch is formed in the support surface of the lightweight cellular concrete floor panel on the extension line of the two end edges, and a plurality of beam constituent members constituting the additional beam are inserted into the notch and the existing beam is inserted. A plurality of beam constituent members coupled to each other and integrated to support the two edges of the floor opening, and in the span direction of the lightweight cellular concrete floor panel among the edges of the floor opening. Orthogonal A lightweight air bubble characterized in that a lateral buckling prevention member is disposed along the two edges of the floor opening to connect the two additional beams and to support the other two edges of the floor opening. Reinforcement method for concrete floor panels. In a building having a floor composed of lightweight cellular concrete floor panels laid on opposite beams opposite to each other in an existing building, and a ceiling back space formed below the lightweight cellular concrete floor panel A method for reinforcing the lightweight cellular concrete floor panel, wherein an opening is formed by cutting out a ceiling surface corresponding to a position to be reinforced, and the additional beam according to claim 1 or 2 is in an uncoupled state through the opening And insert into the back space of the ceiling, and form a notch in the support surface of the lightweight cellular concrete floor panel to lock the locking portions of the plurality of beam constituent members constituting the additional beam to the existing beam and a plurality of A method for reinforcing a lightweight cellular concrete floor panel, wherein beam structural members are combined and integrated to support the lower surface of the lightweight cellular concrete floor panel.

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