JP2010037739A - Floor extending unit and its mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain floor extension at a rational cost without affecting the earthquake resistance of an existing building even when the extension width is large. <P>SOLUTION: This floor extending unit 1 is composed of a rectangular extended floor part 8 and an overhang wall part. The overhang wall part includes a pair of overhang wall members 9a, 9a erected on the side peripheral edge out of the outdoor side peripheral edge of the extended floor part, and an overhang wall member 9b erected on the peripheral edge of a front face. The overhang wall part has a U-shaped horizontal section as a whole. The overhang wall member 9a is constituted by sticking structural plywood 10 to the outdoor-side side face of a horizontal framework 6a and sticking structural plywood 11 to the indoor-side side face respectively. The overhang wall member 9b is constituted by sticking structural plywood 10 to the outdoor-side side face of a framework 6b built up in three stages and sticking structural plywood 11 to the indoor-side side face respectively. The extended floor part 8 is constituted by sticking structural plywood 12 to the upper face of a framework 7 built up in ladder shape. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a floor expansion unit that is applied mainly to floor expansion of an existing building and a mounting structure thereof.

  In housing, not only living rooms such as living rooms, dining rooms, study rooms, and bedrooms, but also bathrooms, etc., there is a high need to expand the living space and increase comfort by increasing the floor space. In many cases, the floor expansion work is carried out as part of the renovation.

  Conventionally, in the case of a two-floor room, this type of floor expansion work has been done by providing an extension beam in the building frame and supporting the expanded part on the extension beam. It was supported by supporting the part.

JP 2000-337031 A JP 2001-329636 A

  However, in order to provide an overhanging beam, not only the outer wall of the building but also the second-floor floorboard and the first-floor ceiling are appropriately removed to expose the existing column beam, and the column beam is applied to the column beam while reinforcing. It had to be connected, and there was a problem that it was inherently difficult to install from the viewpoint of economic rationality.

  On the other hand, in the recent renovation work, since the expansion width of the expanded space tends to be large, the load burden of the overhanging beam becomes increasingly severe, and the above-described problem becomes more serious.

  Also on the first floor, the foundation work to support the load of the increased floor area was expensive, and eventually the floor expansion work had to be abandoned.

  In addition, the part where the existing wall is removed for the floor expansion work will inevitably become an opening, making it impossible to place the load-bearing wall, resulting in the problem that the load-bearing wall cannot be placed in a well-balanced manner throughout the building. Also occurred.

  The present invention has been made in consideration of the above-mentioned circumstances, and even if the expansion width is large, it does not affect the earthquake resistance of the existing building and can be expanded at a reasonable cost. It is an object to provide a unit and its mounting structure.

  In order to achieve the above object, a floor expansion unit according to the present invention comprises, as described in claim 1, an additional floor portion and a non-opening overhanging wall portion erected on the outdoor side periphery of the additional floor portion. At the same time, the overhanging wall portion is constituted by using a structural plywood.

  In the floor expansion unit according to the present invention, the overhanging wall portion is configured by attaching the structural plywood to at least one side of the shaft assembly.

  In addition, as described in claim 3, the floor expansion unit mounting structure according to the present invention spans the floor expansion unit according to claim 1 or 2 between a pair of stiffening columns and their tops. A structure for mounting an additional floor unit to be attached to a building frame via a portal frame made of stiffening beams, wherein the building side edges of the overhanging wall portions are respectively joined to the pair of stiffening columns, and the building The portal frame is disposed in a construction surface including a pair of columns constituting the frame and a beam spanned on the top thereof, and the outer side surface of each stiffening column and the inner side surface of each column are bonded. In addition, the upper surface of the stiffening beam and the lower surface of the beam are bonded.

  In addition, the mounting structure of the floor expansion unit according to the present invention is such that the joint portion is sandwiched from both sides by the joint portion between the column and the beam and the joint portion between the stiffening column and the stiffening beam. A pair of structural plywood.

  In the floor expansion unit and its mounting structure according to the present invention, it comprises an additional floor portion and a non-opening extended wall portion standing on the outdoor side periphery of the additional floor portion, and the extended wall portion is a structural plywood. It is comprised using.

  Structural plywood is generally used for bearing walls as defined by the Japanese Agricultural Standards (JAS) as “the main part of plywood used for the structural strength of buildings” However, it has a large shear rigidity and shear strength.

  Therefore, when a vertical load (dead load + live load) acts on the additional floor, the structural plywood resists with a shearing force, and the vertical load is reliably transmitted to the building frame via the structural plywood.

  The protruding shape of the floor expansion unit with respect to the building frame is arbitrary. For example, by joining two projecting wall members at the edges to form a projecting wall portion, the three projecting wall members that project in a triangular shape from the building frame are joined in a U-shape. By projecting the projecting wall part into a rectangular shape, the projecting wall part projects in a polygonal shape by joining a number of projecting wall members in a bent shape. It is conceivable to form the projecting wall portion with a curved projecting wall member so as to project from the building frame in an arc shape.

  The configuration of the overhanging wall portion is arbitrary as long as it is configured using a structural plywood. For example, a thick structural plywood having a thickness of about 24 to 35 mm may be used alone or directly bonded together. Although it is possible, it is also possible to comprise an overhang | projection wall part by affixing the structural plywood on the at least one side of a shaft set.

  The method of attaching such a floor expansion unit to the building frame is arbitrary, but the extension wall portion is attached to the stiffening column of the portal frame composed of a pair of stiffening columns and a stiffening beam spanned on top of them. If the building side edges are joined and attached to the building frame via the portal frame, the load of the floor expansion unit can be reliably transmitted to the building frame via the portal frame.

  In order to attach the portal frame to the building frame, the portal frame is arranged in a construction surface including a pair of columns constituting the building frame and beams spanned on top of them, and the outer side surface of each stiffening column The inner side surface of each column is bonded, and the upper surface of the stiffening beam and the lower surface of the beam are bonded.

  In this way, the floor expansion unit is firmly fixed to the building frame via the gate-type frame, and thus it can be installed on the second floor without providing an overhanging beam. It is no longer necessary to add a foundation when installing.

  In addition, the gate-type frame is firmly joined to the column beams that make up the building frame by bonding, making it a frame structure consisting of double columns and double beams, so it is resistant to horizontal seismic forces acting on the building frame. Even if the existing wall is removed for the floor expansion work, the same function as that of the existing wall or higher than that of the existing wall is given to the building.

  Here, if a pair of structural plywood is bonded to the joint between the column and the beam and the joint between the stiffening column and the stiffening beam so that the joint is sandwiched from both sides, the portal frame Becomes a semi-rigid frame or a structure close to a rigid frame, and the horizontal rigidity and strength are further increased, and the earthquake resistance of the building is dramatically improved.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a floor expansion unit and its mounting structure according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

(First embodiment)

  1A and 1B are diagrams showing a floor expansion unit according to the present embodiment, in which FIG. 1A is a front view, FIG. 1B is a bottom view as viewed from the direction of the AA line, and FIG. It is the side view seen from the -B line direction. As can be seen from these drawings, the floor expansion unit 1 according to the present embodiment includes a pair of rectangular extension floors 8 and a pair of erections on the side edges of the outdoor floor edges of the extension floors. A non-opening extending wall portion composed of the extending wall members 9a, 9a and an extending wall member 9b erected on the front peripheral edge, and an upper edge of the extending wall portion is connected to a ceiling surface which is a lower surface. It is comprised with the collar part 13 opposingly arranged above the additional floor part 8, and this overhang | projection wall part makes a U-shaped horizontal cross section as a whole.

  The overhanging wall member 9a is constructed by adhering the structural plywood 10 to the outdoor side surface of the horizontally assembled shaft assembly 6a and the structural plywood 11 to the indoor side surface, and the overhanging wall member 9b. Is constructed by attaching the structural plywood 10 to the outdoor side surface of the three-stage shaft assembly 6b and the structural plywood 11 to the indoor side surface. Further, the extension floor portion 8 is configured by attaching a structural plywood 12 to the upper surface of the shaft group 7 assembled in a ladder shape.

  The structural plywoods 10 to 12 are appropriately selected from those defined in the Japanese Agricultural Standards (JAS) as “the main parts of the plywood used for the structural strength of the building”. .5mm plywood should be used.

  When the floor expansion unit 1 is attached to the building frame, a known attachment method can be selected. For example, when the building frame is a frame, the building side edge of the overhanging wall members 9a, 9a may be fixed to the column of the building frame.

  Although the use of the area expanded by the floor expansion unit 1 according to the present embodiment is arbitrary, as described above, since the overhanging wall portion is not open and no window is formed, for example, a wall surface storage system It is suitable for installing kitchen facilities including large refrigerators.

  As described above, according to the floor expansion unit 1 according to the present embodiment, the overhanging wall members 9a and 9a and the overhanging wall member 9b whose entire cross-section is U-shaped on the outdoor side periphery of the additional floor 8. In addition, the overhanging wall member 9a is constructed by attaching the structural plywoods 10 and 11 to the outdoor side surface and the indoor side surface of the shaft set 6a. The structure is reliably supported by the building frame via the structural plywood without falling to the outdoor side due to rigidity.

  Therefore, it is possible to install the floor expansion unit 1 on the second floor of the building without providing an overhanging beam, and when installing on the first floor of the building, there is no need to add a foundation.

  In the present embodiment, an example in which a structural plywood having a thickness of 12.5 mm is attached to both surfaces of the shaft assembly has been described. However, the overhanging wall portion according to the present invention is not limited to such a configuration, for example, It is also possible to construct the overhanging wall part by combining structural plywood of about 24 to 35 mm alone or by directly bonding them.

  Moreover, in this embodiment, the ceiling of the expansion floor part 8 is considered by arranging the eaves part 13 with the water gradient from the building side toward the outdoor side above the expansion floor part 8 in consideration of rain. However, it is arbitrary how the ceiling of the additional floor portion 8 is configured. For example, a flat ridge portion can be employed instead of the ridge portion 13.

(Second Embodiment)

  Next, a second embodiment will be described. Note that components that are substantially the same as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  2 is a front view showing the mounting structure 21 of the floor expansion unit according to the present embodiment, FIG. 3 is a bottom view (look-up view) seen from the CC line direction of FIG. 2, and FIG. It is a vertical sectional view in alignment with line DD.

  As can be seen from these drawings, the floor expansion unit mounting structure 21 according to this embodiment includes the floor expansion unit 1 from a pair of stiffening columns 23 and 23 and a stiffening beam 24 stretched over the tops thereof. It is attached to the building frame via a gate-shaped frame 22.

  That is, the floor extension unit mounting structure 21 joins the building side edge of the overhanging wall member 9a of the floor extension unit 1 to the pair of stiffening columns 23 and 23 constituting the portal frame 22, respectively. A portal frame 22 is arranged in a frame including a pair of pillars 25, 25 constituting the frame and a beam 26 bridged on top of them, and the outer side surfaces of the stiffening pillars 23, 23 and the pillars 25, 25 The inner side surfaces are bonded to each other, and the upper surface of the stiffening beam 24 and the lower surface of the beam 26 are bonded to each other.

  Here, the joint between the column 25 and the beam 26 and the joint between the stiffening column 23 and the stiffening beam 24 are paired with a pair of structural plywoods 28 and 28 so that the joints are sandwiched from both sides. Is adhered.

  In order to construct the above-mentioned floor expansion unit mounting structure 21, first, the floor expansion unit 1 and the gate frame 22 are manufactured in consideration of the column position and beam position of the building frame.

  That is, the inner dimension of the columns 25 and 25 is W, and the inner dimension from the upper surface of the beam 27 on which the column 25 is erected to the lower surface of the beam 26 is H. The width W and the height H are manufactured.

  Next, the existing wall surrounded by the columns 25 and 25 and the beams 26 and 27 is dismantled and removed.

  Next, the gate-type frame 22 is disposed in the opening generated as a result of removing the existing wall, and the outer side surfaces of the stiffening columns 23 and 23 and the inner side surfaces of the columns 25 and 25 are bonded to each other. The upper surface of 24 and the lower surface of the beam 26 are bonded.

  The floor expansion unit 1 may be attached to the portal frame 22 before or after the portal frame 22 is attached to the building frame. Moreover, depending on the case, both may be performed simultaneously.

  Finally, a pair of structural plywoods 28 and 28 are bonded to the joint between the column 25 and the beam 26 and the joint between the stiffening column 23 and the stiffening beam 24, and the joint is joined with the structural plywood 28 and 28. Sandwich.

  As shown in FIG. 4, the additional floor portion 8 becomes an expansion area of the existing floor 41, for example, the second floor, and therefore it is conceivable to perform the finishing work with the same finishing material as the existing floor 41.

  As described above, according to the mounting structure 21 of the floor expansion unit according to the present embodiment, the floor expansion unit 1 is firmly fixed to the building frame via the gate frame 22 and the portal frame 22 and The column 25 and the beam 26 of the building frame constitute a frame composed of a double column and a double beam as a whole.

  Therefore, the rigidity of the place where the floor expansion unit 1 is attached is greatly improved, and it is possible to increase the second floor without using the overhanging beam, and it is necessary to add a foundation even when expanding the first floor. Disappear.

  In addition, since the portal frame 22 is firmly bonded to the columns 25 and 25 and the beams 26 constituting the building frame by bonding, the double columns and the double beams are combined with the columns 25 and the beams 26 of the building frame. Construct a frame consisting of

  Therefore, the gate-type frame 22 exhibits the same function as a load-bearing wall against horizontal seismic force acting on the building frame, and thus the part where the existing wall is removed for the expansion work is necessarily an opening. Even if it becomes, it becomes possible to give the building an earthquake resistance equivalent to or higher than that of existing walls.

  Further, according to the mounting structure 21 of the floor expansion unit according to the present embodiment, a pair of structural plywoods 28 and 28 are provided at the joint between the column 25 and the beam 26 and at the joint between the stiffening column 23 and the stiffening beam 24. And the joint portion is sandwiched between the structural plywoods 28 and 28, so that the gate-type frame 22 becomes a semi-rigid frame or a structure close to a rigid frame and further increases the rigidity and strength in the horizontal direction. As a result, the earthquake resistance of the building can be greatly improved.

  In this embodiment, the pair of structural plywoods 28 and 28 are bonded to the joint between the column 25 and the beam 26 and the joint between the stiffening column 23 and the stiffening beam 24. May be omitted, the structural plywood 28 may be omitted.

It is the figure which showed the floor expansion unit which concerns on this embodiment, (a) is a front view, (b) is the bottom view (looking up view) seen from the AA line direction, (c) is the BB line direction. The side view seen from. The front view which showed the attachment structure 21 of the floor expansion unit which concerns on this embodiment. The bottom view seen from the CC line direction of FIG. 2 (looking up figure). FIG. 3 is a vertical sectional view taken along the line DD in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor expansion unit 6a, 6b, 7 Shaft group 8 Extension floor part 9a, 9b Overhang | projection wall member (extension wall part)
10, 11, 12 Structural plywood 22 Portal frame 23 Stiffening column 24 Stiffening beam 25 Columns 26, 27 Beam 28 Structural plywood

Claims (4)

An extension floor unit comprising an extension floor and a non-opening extension wall portion erected on the outdoor side periphery of the extension floor portion, and the extension wall portion is configured by using a structural plywood. . The floor expansion unit according to claim 1, wherein the overhanging wall portion is configured by pasting the structural plywood on at least one side of a shaft set. The floor expansion unit according to claim 1 or 2, wherein the floor expansion unit is attached to a building frame via a gate-shaped frame comprising a pair of stiffening columns and stiffening beams spanned on top of them. The building side edge portion of the overhanging wall portion is joined to the pair of stiffening columns, and includes a pair of columns constituting the building frame and beams spanning the top portions thereof. The gate-type frame is disposed on the outer side surface of each of the stiffening columns and the inner side surface of each of the columns, and the upper surface of the stiffening beam and the lower surface of the beam are bonded. Mounting structure for the floor expansion unit. The pair of structural plywood is bonded to a joint portion between the column and the beam and a joint portion between the stiffening column and the stiffening beam so that the joint portion is sandwiched from both sides. Mounting structure.

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