JP2011241548A - Building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow movement of columns and extension and alteration accompanied with new installation to be easily performed.SOLUTION: Junction between a strut 20, a first floor beam 30 and a first floor column 40 is bolted junction, the first floor beam 30 being made of a shape steel. A bolt fixing part for joining the first floor column 40, and a bolt fixing part for joining the strut are formed in the upper flange of the shape steel and in the lower flange of the shape steel respectively, at a predetermined pitch, and the strut 20 and the first floor column 40 are detachably constituted so that they are joinable even after construction of the upper frame of a building and can be detached by removing the bolt of the junction. Junction between a foundation slab 10 and the strut 20 is preferably performed by means of an embedded type bolt and nut embedded in the foundation slab 10.

Description

  The present invention relates to a building. More specifically, the present invention relates to an improvement in a building and an improvement in the seismic isolation response.

  Conventionally, when a building with a reinforced concrete foundation is expanded or reconstructed, a new anchor bolt is required to move or newly install a column or load-bearing element (an element that resists horizontal forces such as earthquakes such as braces) In many cases, post-installation anchors such as hole-in anchors and chemical anchors were driven into the upper edge of the rising part of a narrow foundation, which required time and effort.

  Patent Document 1 discloses a foundation structure in which a column is placed and joined to a support column, not a reinforced concrete foundation rising portion. In this basic structure, since the column and the column are joined by bolt joining, the joining can be easily released by loosening the nut and extracting the bolt.

JP 2001-262586 A

  However, the struts are embedded in the concrete foundation beams and are not configured to be easily moved or newly installed (added). In addition, a support beam is also joined to the support column, and it is necessary to replace the support beam when moving the support beam.

  Then, an object of this invention is to provide the building which can perform extension and reconstruction accompanying the movement of a pillar and new construction easily.

  In order to solve this problem, the present inventor has examined a building including a foundation slab, a bundle, a beam, a column, and the like. For example, on the upper floor of a building, bolts are joined between parts using members that have bolt holes in advance at predetermined positions, making it easy to expand and renovate with moving columns or adding (adding). It is possible to do. In particular, the present inventors who have further studied focusing on this point have come to obtain new knowledge that leads to the solution of the problem.

  The present invention is based on such knowledge, and a reinforced concrete foundation slab, a steel bundle installed on the upper surface of the foundation slab, a steel first floor beam supported by the bundle, and the position of the bundle. And a first floor column erected on the upper surface of the first floor beam in a corresponding manner, and the connection between the bundle, the first floor beam and the first floor column beam is a bolt connection, and the first floor The floor beam is made of section steel, and the bolt fixing part for the first floor column is formed on the upper flange of the section steel, and the bolt fixing part for bundle joining is formed on the lower flange of the section steel at a predetermined pitch. The bundle and the first-floor pillar are characterized in that they can be joined even after the construction of the upper frame of the building and can be removed by removing the bolts at the joint.

  In the building according to the present invention, a beam having a bolt fixing portion (bolt fixing hole) at a predetermined position in advance is used as the first floor beam as in the upper floor. If the bolt fixing part is used, the column can be moved to a predetermined position, or can be newly installed and fixed with a bolt. Become.

  In such a building, the foundation slab and the bundle are preferably joined by an embedded nut and bolt embedded in the foundation slab. If an embedded nut is provided in advance at a predetermined position in anticipation of future expansion / reconstruction, it is possible to easily move or newly install a bundle accompanying expansion / reconstruction.

  In this case, the bundle has a notch for joining in the lower flange of the first floor beam, and the joining of the foundation slab and the bundle is by anchor bolts and nuts embedded in the foundation slab and projecting at the upper end. It is preferable that the bundle can be moved laterally by loosening the nut. Such a bundle can be easily inserted and fixed between the foundation slab and the first-floor beam, making it easier to cope with extension and renovation involving movement of a column or new installation.

  Furthermore, it is preferable that the building is seismically isolated by replacing the bundle with a bundled seismic isolation bearing. In such a building, seismic isolation structure can be realized with relatively little effort, and safety can be further improved.

  In this case, it is also preferable that a cover material made of a plate-shaped synthetic resin foam is detachably attached to the outer peripheral portion side of the first-story floor beam from the outside of the building. In this way, the building can be seismically isolated, and damage to the lower structure can be suppressed even when the upper structure is relatively displaced by the earthquake. In addition, it is easy to repair when damage occurs.

  According to the building concerning this invention, it becomes possible to perform extension and reconstruction accompanying movement of a pillar and new construction easily.

It is a perspective view which shows the first process example (root cutting, PC board installation, anchor bolt installation) at the time of construction of a building. It is a perspective view which shows the bar arrangement process of a basic slab. It is a perspective view which shows the process of installing a bundle in an anchor bolt. It is a perspective view which shows the process of installing a steel frame beam. It is a perspective view which shows the process of installing a horizontal brace. It is a perspective view which shows the process of installing a plate-shaped heat insulating material etc. in the outer peripheral part of a foundation slab. It is a perspective view which shows the process of placing concrete. It is a perspective view which shows the process of installing a beam upper part frame. It is sectional drawing which shows an example of the foundation of the constructed building. It is sectional drawing which shows an example of the foundation of the state in which the horizontal brace was installed. It is a top view which shows the structural example of the steel beam of the part in which the horizontal brace was installed through the hit. It is a perspective view which shows the form example of an outer periphery bundle | flux. It is a perspective view which shows the other example of an outer periphery bundle | flux. It is a top view which shows the example of the form of the underfloor inspection structure concerning this invention. It is sectional drawing which shows the example of a form of the underfloor inspection structure containing a traffic part. It is a figure which shows an example of the embedded type nut of the state embed | buried in the foundation slab. It is a perspective view which shows the structural example of an embedded nut. It is a perspective view which shows another structural example of a bundle. It is a figure which shows a mode that the bundle | flux shown in FIG. 18 was inserted and fixed between the foundation slab and the 1st floor beam.

  Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

  An embodiment of the present invention is shown in FIG. The building A exemplified in the present embodiment is a two-story steel frame industrialized house by a beam winning method having a flat module of 305 mm. However, this is only a preferable application example, and the scope of application of the present invention is not limited thereto.

  In the building A, the foundation slab 10, a bundle 20 (see FIG. 3 and the like) placed and fixed on the upper surface of the foundation slab 10, a beam (hereinafter also referred to as a first-floor floor beam) 30 supported by the bundle 20 ( (See FIG. 4 etc.) A pillar (hereinafter also referred to as a first floor pillar) 40 (see FIG. 8) placed and fixed on the first floor beam 30 is arranged to connect the upper ends of the first floor pillars 40. 2nd floor beams (not shown) 2nd floor pillars (not shown) placed on the 2nd floor beams, R floor beams (not shown), members such as load bearing elements installed between two adjacent pillars The basic frame is arranged corresponding to a plurality of selected reference lines (X-direction reference line, Y-direction reference line) respectively (set to be an integer multiple of the module). It is configured. Furthermore, in the building A, each floor is composed of floor panels made of ALC (Autoclaved Light-weight Concrete) supported by each floor beam, and each floor is constructed using the outer peripheral beam. An outer wall panel or an opening panel made of ALC or the like is attached to form an outer wall.

  In the present embodiment, the foundation slab 10 is entirely solid. In the foundation slab 10, a range of a predetermined width along the street (a range in which the load from the bundle 20 is dispersed, for example, a diagonal line drawn at an angle of 45 degrees from the edge of the lower flange of the bundle 20 (see FIG. 9 (refer to the broken line in FIG. 9) and the range of the intersection of the bottom surface of the foundation slab 10), the bar arrangement amount is calculated as a foundation beam that opposes the ground reaction force (see FIGS. 9 and 10). For other areas, the amount of bar arrangement is determined by regarding the slab as a fixed four side that receives ground reaction force. In this embodiment, the solid foundation type foundation slab 10 is illustrated, but is not limited to such a solid foundation type, for example, has a desired width according to the ground strength along the street. A footing type can also be used. The level of the upper end of the foundation slab 10 of the present embodiment is set higher than the ground surface (see FIGS. 9 and 10).

  The bundle 20 is placed on the upper surface of the foundation slab 10, protrudes from the upper end surface of the foundation slab 10, and supports the above-mentioned first floor beam 30 (see FIG. 4 and the like). In the present embodiment, anchor bolts (anchor frames) 11 are embedded in the foundation slab 10 in advance (see FIG. 1 and the like), and the bundle 20 is joined to the upper end portion of the anchor bolts 11 with, for example, nuts and fixed (see FIG. 1). (See 3 etc.). The bundle 20 has a role of efficiently transmitting the load transmitted from the pillar (first floor pillar 40) to the foundation slab 10, and is directly below the first floor pillar 40 standing on at least the floor beam 30 (on the street). Is installed using a bolt hole in the lower flange of the middle part of the joint box 21 or the first floor beam 30 and supports the first floor beam 30.

  The bundle 20 has a lower flange 20b joined to the upper end portion of the anchor bolt 11, an upper flange 20a joined to, for example, the joint box 21, and a cross section (horizontal section) connecting these flanges 20a and 20b, for example, a cross. (Including a cross-shaped web) 20c. The upper flange 20a is provided with an upper bolt hole 20d for joining the joint box 21, and the lower flange 20b is provided with a lower bolt hole 20e for joining the bundle 20 to the upper end of the anchor bolt 11. (See FIGS. 12 and 13).

  Such a bundle 20 is appropriately arranged on the outer peripheral portion (that is, the portion near the outer wall) and the inner peripheral portion (that is, the portion near the inside of the building A) of the building A. Among these, a bundle (also referred to as an outer circumferential bundle in this specification) 20 arranged along the edge of the foundation slab 10 in the outer peripheral portion (outer street) is outside the building (a portion near the outer periphery of the building A). The edge positions of the upper flange 20a and the lower flange 20b coincide, and on the inner side of the building (the side facing the interior of the building A), the lower flange 20b extends toward the inner side of the building than the upper flange 20a. The web 20c has a shape (offset shape) formed in a divergent shape from the end edge of the upper flange 20a to the end edge of the lower flange 20b (see FIG. 9, FIG. 12, etc.). In addition, at the entrance corner and the exit corner of the building A, the lower flange 20b extends from the upper flange 20a in two directions along the outer wall, and the extended web 20c extends from the edge of the upper flange 20a to the lower flange. The outer peripheral bundle 20 formed so as to spread toward the end edge of 20b is employed (see FIGS. 3 and 13).

  By using such an offset-shaped outer peripheral bundle 20, the load is distributed and transmitted to a wider range of the foundation slab 10, and the range that can be regarded as the first-floor beam 30 corresponds to the offset direction of the outer peripheral bundle 20. It can be offset inward. That is, in the present embodiment, the amount of reinforcing bars is set by regarding the range of the width according to the contact dimension of the lower flange 20b of the outer peripheral bundle 20 of the foundation slab 10 as the beam 30 that opposes the ground reaction force, More specifically, the arrangement of the intersection between the oblique line drawn at an angle of 45 degrees from the edge of the lower flange 20b of the outer peripheral bundle 20 and the bottom surface of the foundation slab 10 is regarded as a foundation beam that opposes the ground reaction force. The amount is calculated. Therefore, when the offset outer peripheral bundle 20 in which the lower flange 20b extends more than the upper flange 20a is used, the intersection with the bottom surface of the foundation slab 10 by the length L (see FIG. 9) that the lower flange 20b extends. (See FIG. 10 etc.). According to this, by flowing the building load transmitted from the first floor column 40 in the building inner direction, it is possible to distribute and transmit the building load while keeping the extension dimension of the foundation slab in the building outer direction small. The width that can be regarded as a beam against the ground reaction force can be narrowly estimated, and the overcrowded arrangement of reinforcing bars can be prevented. As described above, the extension dimension of the foundation slab 10 on the outer periphery of the building can be kept small without being disadvantageous in the structural plan. For example, this is a case where a sufficient separation dimension is not ensured between the adjacent boundary. However, the construction can be performed without hindering the arrangement of the drain pipe and the like. Furthermore, such a structure is also suitable when performing a water stop treatment for rust prevention of the internal steel member. To give a specific example, by raising the cover material (as an example, a plate-like heat insulating material) in advance instead of the formwork (dam plate) before placing concrete, and improving the adhesion with the foundation slab 10, Even if it does not perform special water stop treatment, it is possible to obtain a state in which a certain level of water stop effect can be expected if not complete. Furthermore, it is possible to prevent the appearance of the building A from becoming unfavorable by preventing the RC portion and the water stop treatment portion from being exposed from the ground surface. For example, by arranging a cover material (for example, a plate-like heat insulating material) so as to cover the lower end of the basic slab 10, it is possible to obtain a design-preferable configuration that is a single material and has no steps. It becomes.

  Moreover, the anchor bolt 11 installed in the foundation slab 10 to fix the lower flange 20b of the outer peripheral bundle 20 to the outer peripheral bundle 20 as described above is connected to the outer periphery of the building A (the first floor floor beam 30, the first floor). The center position of the pillar 40, specifically, the outer shape (the outer shape of the horizontal cross section) may be offset closer to the inside of the building A than the center of the substantially square pillar (centroid). In such a case, the position of the anchor bolt 11 is closer to the inside of the building A, and the marginal dimension from the anchor bolt 11 (dimension from the anchor bolt 11 to the end edge of the foundation slab 10) is sufficiently ensured. It is preferable in terms of strength.

  The beam 30 is made of, for example, an H-shaped steel (including a shaped steel called an I-shaped steel), and a gusset plate 34 having a distal end bent into an L shape and a bolt hole formed at both ends thereof is joined by, for example, welding. (See FIG. 4 etc.). The beam 30 includes not only a large beam (first-floor floor beam) arranged on the street, but also a small beam spanned between opposed large beams to support the floor panel. Note that the small beam may be bridged between the large beam and another small beam.

  Further, the upper flange 30a and the lower flange 30b of the beam 30 are provided with bolt holes 30d through which bolts for joining the module columns are inserted at equal intervals based on the modules (see FIG. 4 and the like). The bolt hole 30d is drilled so as to be located on the intersection of the plane-view reference line. In addition, bolt holes 30d through which bolts for joining other beams 30 are also inserted into the web 30c at equal intervals based on the module. Furthermore, large-diameter holes (for example, a diameter of 125 mm) 30e are formed in the web 30c of the beam 30 at predetermined intervals (see FIG. 4 and the like).

  When joining the ends of the beams (first floor beams) 30, the joint box 21 is used in this embodiment (see FIG. 4 and the like). The joint box 21 is configured by welding a square upper flange 21a and a lower flange 21b to upper and lower ends of a cross-shaped web 21c in plan view. When joining the beam 30 to the joint box 21, the two surfaces of the gusset plate 34 of the beam 30 are brought into contact with the two surfaces of the web 21c orthogonal to each other, the bolt holes in the bent portion of the gusset plate 34 and the corresponding joint box Bolts are inserted into the bolt holes 21 and joined by bolts. It is possible to join the beam 30 from four directions to one joint box.

  Further, when joining the small beam (indicated by reference numeral 30 'in FIG. 4) to the intermediate portion of the other beam 30, the bent portion of the gusset plate 34 is brought into contact with the surface of the web 30c of the intermediate portion, Join the bolts. In addition, the said structure is common in the structure of the beam 30 in an upper floor.

  The column 40 is disposed at the intersection of the street and a reference line orthogonal to the street, and the upper and lower ends are joined using the bolt holes 30d of the upper and lower flanges 30a and 30b in the middle portion of the joint box 21 or the beam 30 (FIG. 8).

  The load-bearing elements 41 are bolted to the inner surfaces of the two pillars 40 arranged at a predetermined interval (for example, 610 mm, 915 mm, etc.). The load-bearing element 41 is composed of, for example, a brace (cross frame) or the like (see FIG. 8).

  A horizontal brace (stiffener) 31 is installed on the floor structure of the first floor to suppress deformation of the beam 30 and the like during concrete placing work (see FIG. 5 and the like). The horizontal brace 31 installed on the floor construction surface is a member for securing the in-plane rigidity of the first floor after the building is completed. If such a horizontal brace 31 is attached in the vicinity of the upper end of the beam 30 directly or via a fire hitting 35, the deformation suppressing effect of the beam 30 and the like, and the workability and underfloor utilization at the time of foundation formation are further improved. (See FIGS. 10 and 11). In addition to the horizontal brace 31 exemplified here, it is also possible to use a fire beam (fired base, fired metal) or the like as a stiffener.

  Further, the first floor (indicated by reference numeral 70 in FIG. 15) has a dimension corresponding to the size of the floor panel (indicated by reference numeral 36 in FIG. 15) and has an opening (reference numeral in FIG. 14). 53), an underfloor inspection port 51 for underfloor inspection is provided (see FIG. 14). However, the underfloor space is divided into fine sections by the beams 30, and the height of the bundle 20 is, for example, about 100 mm. When the bundle 20 is made high, it becomes easy to violate legal restrictions such as height restriction and oblique line restriction. The inspectors cannot go under the beam 30. Therefore, it is necessary to provide an underfloor inspection port for each section. However, it is not desirable from the viewpoint of design that the underfloor inspection port itself or the metal edge of the lid can be seen in many places, and cannot be installed on the floor plan (or underfloor inspection port) Priority may be placed on the installation of the floor space to reduce the degree of freedom of the floor plan).

  In order to cope with such a case, in this embodiment, instead of supporting both ends of some of the beams 30, the beams 30 are divided at intermediate portions to provide discontinuous portions with a predetermined width. Thus, a communication part 60 is formed (see FIG. 15). The width of the discontinuous portion is at least a width through which an inspector can pass. In addition, the ends of the divided beams 30 (strictly speaking, the joint box 21 coupled to the ends of the beams 30) are supported by the bundle 20, and the connecting member 37 is hung on the discontinuous portions (personnel portions 60). The floor panel 36 can be passed and supported so that the inspectors can pass through the space between the connecting member 37 and the foundation slab 10 (person passage section 60) (see FIG. 15). ).

  The connecting member 37 is a smaller member than the beam 30. In the present embodiment, the connecting member 37 is formed in a substantially arch shape with a flat plate portion 37a at the center and bracket portions 37b that cantilever-support both ends of the plate portion 37a (see FIG. 15). When the short side of the rectangular floor panel 36 is supported by the connecting member 37 (when the connecting member 37 is spanned in the short side direction of the floor panel 36 and a part of the floor panel 36 is supported by the connecting member 37). The central portion of the connecting member 37 is preferably disposed near the center of the floor panel 36. The reason for this will be briefly described below with examples.

  That is, the floor panel 36 made of ALC has a width of, for example, 610 mm (= twice that of a flat module), and is generally reinforced by reinforcing bars on the premise of support on two short sides. Further, the floor panel 36 is designed to be safely supported if it is supported at both ends of the short side by approximately a quarter of the length of the short side (for example, 152.5 mm). That is, it is designed so that safety is ensured even if the range of about 305 mm at the center of the short side is not supported. The width of the plate portion is about one half of the width of the floor panel 36 (short side length). The plate portion does not have strength and rigidity that can withstand the support of the floor panel 36, but the bracket portion has strength and rigidity that can withstand the support of the floor panel 36. Therefore, if the central portion of the connecting member 37 is disposed near the center of the floor panel 36, the floor panel 36 can be supported without any structural problem. In addition, when it is located on the long side of the floor panel 36 and does not support the short side, the connecting member 37 is unnecessary in the sense of supporting the floor panel 36, but the position accuracy of the divided beams is maintained (preventing collapse). It works effectively in the sense of

  Further, in addition to the connecting member 37 described above, a stiffening member 38 of the beam 30 that is detachable can be bridged over the discontinuous portion of the beam 30 by bolting or the like. Normally (generally, when inspection work is not performed), the beam 30 in which the connecting member 37 and the stiffening member 38 are separated in cooperation with each other is made to function like a continuous beam. The amount of deflection of the beam 30 can be reduced, and when the load bearing element 41 such as bracing described later is installed on the beam 30, A decrease in yield strength can also be suppressed. When inspection is necessary, the stiffening member 38 of the beam 30 can be removed for inspection. For example, in the present embodiment, a detachable stiffening member 38 is stretched below the connecting member 37 (see FIG. 15). Although not shown in detail, it is preferable that the stiffening member 38 and the beam 30 (or the joint box 21) be connected to each other as the rigidity is increased.

  Moreover, in this embodiment, the opening of the underfloor inspection port 51 is provided in the upper first floor 70 in one of the two underfloor regions that can be moved to each other by the pedestrian 60. In such a case, the number of openings (underfloor inspection port 51) for entering under the floor can be reduced, which is advantageous in terms of the design and cost in the room of the building A. In addition, the plan and furniture layout restrictions due to the presence of the underfloor inspection port 51 can be reduced. A removable cover 52 is provided at the opening of the underfloor inspection port 51 (see FIGS. 14 and 15). In addition, the 1st floor 70 provided with an opening is formed by laminating, for example, a moisture-proof sheet, a gypsum board, a plywood, a floor finishing material, and the like (see FIG. 15).

  A cover material is attached to the outer periphery of the building A along the edge of the foundation slab 10 and the beam 30 on the outer periphery. In the case of the present embodiment, the cover material is made of a plate-like heat insulating material (foamed polystyrene foam or the like) 14 made of a synthetic resin foam, a resin mortar or the like applied to the surface of the plate-like heat insulating material 14. In the present embodiment, the upper end of the plate-like heat insulating material 14 is held by a holder (not shown) locked to the beam 30, and has a reaction force on the beam 30 against the side pressure caused by the concrete when placing the concrete. (See FIGS. 9 and 10). The plate-like heat insulating material (cover material) 14 can also serve as a formwork (dam plate) on the outer periphery of the basic slab 10. The holding tool may be a temporary member at the time of placing concrete or a permanent member. Reference numeral 32 denotes a metal receiver for the outer wall panel (see FIG. 9). The receiver 32 of this embodiment has an inverted T-shaped cross section, and the tip is bent obliquely downward so that the sealing material can be filled.

  The plate-like heat insulating material 14 also serves as a concrete formwork (dam plate) of the foundation slab 10, and is installed in advance before placing concrete (see FIG. 6). Therefore, the level of the lower end of this plate-shaped heat insulating material 14 is the same as the level of the lower end of the foundation slab 10 (see FIG. 9 etc.). By installing the plate-like heat insulating material 14 in advance, the degree of adhesion with concrete is increased, and the upper end level of the foundation slab 10 is set higher than the ground surface, so that it is possible to suppress the intrusion of water into the building A. it can. Moreover, since the edge part of the foundation slab 10 is not exposed, it is preferable in design. Furthermore, when penetrating equipment piping or the like, there is an advantage that it can be easily processed.

  In addition, the space | interval holder 15 which prevents the fall of the upper end part of the plate-shaped heat insulating material 14 to the building interior side is interposed between the plate-shaped heat insulating material 14 and the beam 30. As the distance holder 15, a member made of the same material as the plate-like heat insulating material 14 can be used.

  Next, a structure for facilitating the movement and new installation of the first floor pillar 40 will be described.

  In addition to the anchor bolt 11 described above, it is preferable that an embedded nut 19 that facilitates the movement or new installation (addition) of the first floor pillar 40 is provided in advance. In the present embodiment, the embedded nut 19 is formed by placing the concrete 13 with the nut set in advance in the foundation slab 10 (see FIG. 16 and the like). The nut used here is a nut called a high nut or the like (longer in the axial direction) than a normal nut. In the present embodiment, the high nut indicated by reference numeral 191 is disposed and embedded in the foundation slab 10 so that the upper end face 191a thereof coincides with the upper end face of the foundation slab (see FIGS. 16 and 17).

  In addition, although the aspect which provided the embedded nut 19 in addition to the anchor bolt 11 mentioned above was illustrated here, it replaced with these anchor bolts 11 and was embedded according to the content of the future extension and reconstruction. It is also preferable to provide the nut 19 in advance. For example, when removing an existing bundle 20 having a normal round bolt hole, it may be necessary to cut the anchor bolt 11 depending on the case. When such a situation is assumed, it is also preferable to provide an embedded nut 19 instead of the anchor bolt 11.

  Although the form of the embedded nut 19 is not particularly limited, for example, in the present embodiment, the four high nuts 191 are connected to each other in a predetermined positional relationship using a plate-like (or frame-like) connecting member 192 in advance. Thus, the embedded nut 19 is configured. The embedded nut 19 is held at a predetermined position by fixing the connecting member 192 to the reinforcing bar 12 in the foundation slab 10 using a binding wire or the like (see FIG. 16).

  For such an embedded nut 19, a so-called dimensioned bolt 22 that does not have a hexagonal head and is threaded over its entire length can be used as an anchor bolt. In this embodiment, a part of this cutting bolt 22 is screwed into the high nut 191 and its upper end is protruded from the foundation slab 10, and the upper end is the lower bolt hole 20 e of the lower flange 20 b of the bundle 20. And the bundle 20 is fixed to the embedded nut 19 by fastening with a normal nut.

  In the case of the above configuration, the bundle 20 can be removed from the anchor bolt 11 by removing the nut and the bolt (see FIGS. 3 and 9). Further, at the position where the embedded nut 19 is embedded, the bundle 20 can be inserted between the foundation slab 10 and the first floor beam 30 and fixed onto the embedded nut 19.

  Here, for example, when considering the extension of Building A, it may be necessary to add a pillar and a load-bearing element in addition to the extension part at the time of extension. Since the pulling force acts by the horizontal force, the anchor bolt 11 needs to be able to withstand the pulling force. Therefore, when extension is assumed, it is possible to make the building highly reliable in terms of seismic performance by burying the embedded nut 19 in advance in the assumed position of the foundation slab 10 from the beginning of the new construction.

Moreover, when considering the additional position of a load bearing element such as a pillar, the embedded position of the embedded nut can be narrowed down by considering the following.
(1) For example, when building A is close to the boundary for three surfaces except the south surface, and the extension is limited to the south garden direction, the windows etc. of the other three outer wall surfaces are excluded except for the south surface. Areas that are not arranged are promising candidates for additional locations for extension pillars (strength elements).
(2) Since it takes a lot of time and effort to move the stairs and water, these are unlikely to be moved. Then, these stairs and positions along the water (positions where large beams are present) are also promising candidates.
(3) The pillar installed at the time of new construction can be used as it is as a pillar for attaching a strength element.

  Further, in the building A in which the bundle 20 can be removed and moved as described above, when the bundle 20 is actually removed, the base slab 10 and the first-floor beam are used instead of the base isolation member such as the base isolation support. It is preferable to interpose between 30 and 30. The building A can be easily seismically isolated with a little effort of inserting the seismic isolation member and replacing it with the bundle 20, and the safety can be further improved. As the seismic isolation bearing, various bearings such as a laminated rubber bearing, a sliding bearing, and a rolling bearing can be applied. Any seismic isolation bearing only needs to have a fixed piece corresponding to the embedded nut 19 or the anchor bolt 11 and the bolt hole 30d of the first floor beam 30.

  In this way, if a seismic isolation member is provided and a particularly suitable case is illustrated, for example, when a building strength cannot be obtained even if a load bearing element is added by the above method at the time of extension, or a revision of the earthquake-resistant design standard This is the case when the standard is no longer met (existing ineligibility). In these cases, if the seismic isolation structure is formed by the above-described method, the possibility of obtaining the required seismic performance is increased.

  In the case of the seismic isolation structure, a restoration material for restoring the displaced superstructure to its original position, a stopper that defines the maximum displacement, a damping material such as a damper, etc. are used for the embedded nut 19 or the anchor bolt 11, And it can add suitably using the bolt hole 30d of the 1st floor beam 30.

  In addition, although not particularly illustrated, when a seismic isolation structure is provided, a cover material (for example, the above-described plate-shaped heat insulating material 14) made of, for example, a plate-shaped synthetic resin foam is attached to and detached from the building outer peripheral side of the first floor beam 30. It is also preferable to mount it as possible. When the seismic isolation structure is formed by the above method, the upper structure may be displaced in the horizontal direction due to the seismic force. In this case, even if the cover material collides with the lower structure, the building A is damaged. In addition, even if the cover material is damaged, it can be easily repaired.

  Up to this point, as an example of the structure for facilitating the movement or new installation of the first floor pillar 40, etc., the bundle 20 shown in FIG. 3 and the like can be removed and further attached (moved) to other locations. However, the bundle 20 that can be the target is not limited to that described above. Another structure example of the bundle 20 that can be included in the object when the first floor column 40 or the like is easily moved or newly installed will be described below (see FIGS. 18 and 19).

  The bundle 20 shown in FIG. 18 includes an upper flange 20a, a lower flange 20b, a plate 20f that connects the end sides of both flanges 20a and 20b, and a reinforcing plate 20g that connects approximately the center of both flanges 20a and 20b. The upper flange 20a, the lower flange 20b, and the plate 20f are connected in a channel shape (U shape). The plate 20f and the reinforcing plate 20g constitute a T-shaped web in the bundle 20 (see FIG. 18).

  The upper flange 20a is provided with, for example, two upper bolt holes 20d for joining to the first floor beam 30. Further, the lower flange 20b is provided with notches (substantially U-shaped semi-closed bolt holes) 20h for joining to the foundation slab 10 at, for example, two places. The joining notch 20h enables the bundle 20 to slide in a state where the joining bolt (nut) is loosened, and is provided in parallel (see FIG. 18).

  Here, it is assumed that two bundles 20 are arranged and used so as to oppose one (one) first-floor pillar 40 (see FIG. 19). In joining the basic slab 10 and the bundle 20, the upper end of the anchor bolt 11 (or the dimensioned bolt 22 of the embedded nut 19) is inserted into the joining notch 20h, and a normal joining nut (see FIG. 19 (shown by reference numeral 23 in FIG. 19). The bundle 20 removes the bolt (indicated by reference numeral 24 in FIG. 19) for joining with the first floor beam 30, loosens the joining nut 23 with the foundation slab 10, and uses a jack or the like to attach the first floor beam 30. By making the state slightly lifted from the bundle 20, it can be moved laterally and removed. Moreover, if it is the position where the anchor bolt 11 (or embedded nut 19) is embed | buried, it can insert and fix between the foundation slab 10 and the 1st floor beam 30 in the reverse procedure to this. Therefore, as in the case described above, the anchor bolt 11 (or the embedded nut 19) is embedded in a predetermined position in advance, so that it is possible to cope with the addition of the load bearing element accompanying the extension.

  Then, it demonstrates below, giving an example about the construction procedure of the foundation of the building A. FIG.

  First, the ground is root-cut (root-cut), and crushed stone 17 is spread and rolled (see FIG. 1). A PC (precast concrete) plate 16 is installed at a bundle position (position where the bundle 20 is installed) on the bottom of the root cutting (see FIG. 1). After fixing the fixing plate 18 of the anchor bolt 11 to the PC plate 16, the anchor bolt 11 is fixed to the fixing plate 18 (see FIG. 1).

  Subsequently, the reinforcing bars 12 are arranged (see FIG. 2). In the present embodiment, the reinforcing bars 12 are densely arranged in a portion (a range of a predetermined width along the street) regarded as a foundation beam according to the calculated arrangement amount.

  Thereafter, the bundle 20 is installed on the anchor bolt 11 (see FIG. 3). First, a lower nut for temporarily supporting the bundle 20 is screwed into the anchor bolt 11, and the level (height) of the bundle 20 is adjusted. Subsequently, the anchor bolt 11 is inserted into the bolt hole of the lower flange 20b of the bundle 20, and the upper nut is further screwed to fix the bundle 20 (see FIG. 9 and the like). In FIG. 9 and FIG. 10, the anchor bolt 11 and the lower flange 20b are joined differently. That is, in FIG. 9, since the position of the anchor bolt 11 with respect to the outer peripheral bundle 20 is offset from the case of FIG. 10, the anchor bolt 11 is a web 20c of the outer peripheral bundle 20 (a web orthogonal to the end-spread web 20c). 10), the anchor bolt 11 is inserted into the lower bolt hole 20e of the lower flange 20b and fastened with a nut from above the lower flange 20b as shown in FIG. Therefore, in such a case, a tap hole that does not penetrate through the lower flange 20b is provided, and the anchor bolt 11 is screwed and fixed thereto (see FIG. 9).

  Subsequently, the beam 30 is placed on the bundle 20 and fixed using bolts and nuts (see FIG. 4).

  Next, the plate-shaped heat insulating material 14 is erected on the outer periphery of the foundation. Further, a spacing holder 15 is provided along the outer surface of the plate-like heat insulating material 14 (see FIG. 6).

  Further, a stiffener such as a horizontal brace 31 is attached to the first floor construction surface, and the diagonal position of the beam 30 is confirmed to adjust the beam position (distortion correction) (see FIG. 5). As described above, it is preferable to install the horizontal brace (stiffener) 31 at a high position on the construction surface. However, if the level of the upper flange 30a of the beam 30 is exceeded, it becomes an obstacle to laying the floor panel. It is. For example, a procedure of adjusting the beam position with a temporary horizontal brace and then fixing with a fire beam or the like may be adopted.

  Thereafter, concrete is placed (see FIG. 7). In the present embodiment, concrete is placed in accordance with the lower end level of the bundle 20 (see FIG. 9 and the like). After concrete curing, a beam upper frame (first floor column 40 etc.) can be installed (see FIG. 8).

  Prior to the concrete placing step, the work floor (road plate) 33 may be hooked using the beams 30 (see FIG. 7). By using the beam 30 to hang the work floor 33, it is not necessary for the operator to step into the concrete at the time of placing and finishing, and the work of removing the footprints at the time of finishing without making the site dirty. When the work floor 33 is stretched over the lower flange 30b of the beam 30, movement in the longitudinal direction is restricted by the web 30c, and the work floor 33 can be more reliably latched so as not to slip off.

  According to the construction method of the building A according to the present embodiment, the bundle 20 can be supported by the anchor bolt (anchor frame) 11 and the foundation can be formed by the bundle 20 in a pre-positioned state. With a structure that is not easily affected by bending or the like, the foundation can be constructed with high accuracy. According to such a construction method, the necessary work is reduced while maintaining the advantages of the steel foundation (easiness of adjusting the top end accuracy, high degree of freedom in the installation position of the pillars 40, etc., and shallow depth of installation). Construction accuracy can be improved while shortening the construction period.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, an H-shaped steel (including a shaped steel called I-shaped steel) is exemplified as an example of the shaped steel, but this is only a preferable example. In short, as long as it has flanges at one end and the other end, and can be bolted to other members (bundle 20 or first-floor column 40), it is a shape steel that forms first-floor beam 30 It is possible to use. Therefore, it is also possible to use a shape steel such as a U-shaped cross-section groove steel, a C-shaped cross-section lip groove shape steel, or a combination thereof as a shape steel forming the first floor beam 30.

  The present invention is suitable for application to all steel structure buildings.

DESCRIPTION OF SYMBOLS 10 ... Foundation slab, 11 ... Anchor bolt, 14 ... Plate-shaped heat insulating material (cover material), 19 ... Embedded nut, 20 ... Bundle, 20h ... Notch for joining, 22 ... Dimension cutting bolt (bolt), 30 ... 1 Floor beams, 30a ... Upper flange, 30b ... Lower flange, 30d ... Bolt hole (bolt fixing part), 40 ... First-floor pillar, A ... Building

Claims (5)

A reinforced concrete foundation slab, a steel bundle installed on the upper surface of the foundation slab, a steel first-floor beam supported by the bundle, and the first-floor floor beam corresponding to the position of the bundle A first floor pillar standing on the upper surface,
The joint between the bundle, the first floor beam and the first floor pillar is a bolt joint,
The first floor beam is made of section steel, the top flange of the section steel has a bolt fixing portion for joining the first floor pillar, and the bottom flange of the shape steel has the bolt fixing portion for bundle joining. Is formed at a predetermined pitch,
The building characterized in that the bundle and the first-floor pillar are configured to be connectable even after the construction of the upper frame of the building, and to be removable by removing a bolt at the joint.   The building according to claim 1, wherein the foundation slab and the bundle are joined by an embedded nut and a bolt embedded in the foundation slab.   The bundle has a notch for joining at the lower flange of the first floor beam, and the joining of the foundation slab and the bundle is by anchor bolts and nuts embedded in the foundation slab and projecting at the upper end. 2. The building according to claim 1, wherein the bundle can be moved in the lateral direction by loosening the nut.   The building according to any one of claims 1 to 3, wherein the building is seismically isolated by replacing the bundle with a bundled seismic isolation bearing.   The building according to claim 4, wherein a cover material made of a plate-shaped synthetic resin foam is detachably mounted on the outer peripheral side of the first floor beam from the outside of the building.

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