JP2017082520A - Foundation structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation structure of a building capable of reducing cost, by dispensing with a ground improvement in the ground under an equipment foundation.SOLUTION: A stairs unit 22 is installed in an apartment house. The apartment house is supported by a building foundation 26, and the stairs unit 22 is supported by a stairs foundation 50. The stairs foundation 50 is provided in a plurality with respective column parts 24 of the stairs unit 22, and the respective ones support the column parts 24. Both the respective stairs foundations 50 are provided on the side of a rising part 28 of the building foundation 26. A first anchor metal fitting 61 is buried on the inside of the rising part 28, and a second anchor metal fitting 62 is buried on the inside of the stairs foundation 50. These respective anchor metal fittings 61 and 62 are mutually connected, and thereby, the stairs foundation 50 is connected to the rising part 28.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a building foundation.

  Patent Document 1 discloses a configuration in which a stair unit that is separate from the building is installed on the outdoor side of a building made of an apartment house. In the configuration of Patent Document 1, a part of the building foundation on which the building is installed is extended to the lower side of the stair unit to form a stair foundation, and the stair unit is installed on the stair foundation.

Japanese Patent Laying-Open No. 2015-81470

  By the way, the load of the building installed on the building foundation is transmitted to the ground through the building foundation. Therefore, if the ground is soft, it is necessary to construct the building foundation after ground improvement (ground reinforcement).

  Here, in the structure of the said patent document 1, since the stair unit is installed on the stair foundation, the load of a stair unit is transmitted to the ground via a stair foundation. Therefore, when the ground is soft, it is necessary to improve the ground on the ground below the stairs foundation. However, if the ground is improved up to such ground, there is a risk that the cost will increase and the construction period will increase.

  In addition, such a problem is not a problem that can occur only when a staircase unit is installed on the foundation, but can also occur when a facility other than the staircase unit is installed on the foundation (equipment foundation). It is.

  This invention is made | formed in view of the said situation, and mainly provides the foundation structure of the building which can aim at cost reduction etc. by making ground improvement unnecessary about the ground under the equipment foundation. It is the purpose.

  In order to solve the above-mentioned problem, a building foundation structure according to a first aspect of the present invention includes a building foundation that supports a building, and a building foundation that supports building equipment installed inside or outside the building, and the building foundation Has a foundation slab embedded in the ground and a rising part rising upward from the foundation slab, and the equipment foundation is provided on the side of the rising part on the ground. Connection means for connecting to the rising portion is provided.

  According to the present invention, the facility foundation is provided on the side of the rising portion of the building foundation, and the facility foundation is connected to the rising portion by the connecting means. In this case, since the load of the building equipment acting on the equipment foundation can be applied to the building foundation, ground improvement can be made unnecessary for the ground below the equipment foundation. Therefore, it is possible to reduce costs and shorten the construction period.

  The basic structure of the building of the second invention is that, in the first invention, the connecting means is an in-foundation connector provided across the inside of the rising portion and the inside of the equipment foundation. Features.

  According to the present invention, the in-foundation connector is provided across the inside of the rising part of the building foundation and the inside of the equipment foundation, and the rising part and the equipment foundation are connected to each other via the foundation inner metal fitting. Yes. In this case, since the equipment foundation can be firmly connected to the rising portion, the load of the building equipment acting on the equipment foundation can be suitably applied to the building foundation.

  The foundation structure of a building according to a third aspect is the invention according to the second aspect, wherein the in-foundation connector includes a first anchor bracket embedded in the rising portion and a second anchor bracket embedded in the facility foundation. The first anchor fitting includes a first connecting portion that is exposed to the side of the rising portion, and a first anchor portion that extends inward from the first connecting portion to the rising portion. The second anchor fitting has a second connecting part connected to the first connecting part, and a second anchor part extending inward of the equipment foundation from the second connecting part.

  According to the present invention, the first connecting portion of the first anchor fitting embedded in the rising portion is exposed to the side of the rising portion, and the second anchor fitting embedded in the equipment foundation in the first connecting portion. The 2nd connection part is connected. In this case, the rising portion and the equipment foundation are connected to each other via each anchor fitting. In such a configuration, it is possible to manufacture the facility foundation after manufacturing the building foundation. That is, after manufacturing the building foundation, the second anchor fitting (second connecting portion) is connected to the first connecting portion exposed from the rising portion in the first anchor fitting embedded in the rising portion, and then the concrete is driven. It becomes possible to manufacture the equipment foundation. Therefore, for example, after manufacturing a building foundation, a part of the building equipment is placed in the concrete placement area, and the concrete is placed in the placement state, so that a part of the building equipment is embedded in the equipment foundation. The building equipment can be installed in the

  According to a fourth aspect of the building structure of the present invention, in the third aspect of the present invention, a horizontal reinforcing bar extending in the longitudinal direction of the building foundation is disposed inside the rising portion, and the first anchor portion is the horizontal reinforcing bar. It is characterized by extending over the top of the.

  By the way, in the configuration of the third aspect in which the equipment foundation is connected to the rising portion of the building foundation via two anchor fittings, the load of the building equipment also acts on the first anchor fitting. Therefore, in the present invention, in view of this point, the first anchor portion of the first anchor fitting is disposed inside the rising portion so as to straddle the horizontal rebar. In this case, since the load of the building equipment which acts on the first anchor fitting can be supported not only by the concrete but also by the horizontal reinforcing bars, the load of the building equipment can be stably supported.

  According to a building structure of a fifth invention, in the fourth invention, a plurality of foundation reinforcing bars including the transverse reinforcing bars are disposed inside the rising portion, and the first anchor part is formed of the transverse reinforcing bars. A first part extending in the thickness direction of the rising part across the upper part, and a second part extending across the basic reinforcing bar on the side opposite to the first connecting part across the basic reinforcing bar. And

  According to the present invention, the second portion of the first anchor portion intersects the basic reinforcing bar on the side opposite to the first connecting portion with the basic reinforcing bar interposed therebetween. When a pulling force from the rising portion acts on the anchor metal fitting, the pulling force can be received not only by the concrete but also by the basic rebar. Thereby, an equipment foundation can be connected to a standing part in a more stable state.

  The basic structure of a building according to a sixth aspect of the present invention is the building structure according to any one of the first to fifth aspects, wherein the building equipment supports a staircase body having a tread board and a kick board, and the staircase body from below. The building foundation is arranged in a quadrangular ring shape in a plan view, and each of the stair unit is inside surrounded by the rising portion of the square ring building foundation. A column part is installed, and a plurality of the facility foundations are provided for each column part of the stair unit, and each of the column parts is supported by the facility foundation, and each of the facility foundations is the connecting means. And connected to the rising portion.

  In a multi-storey building having stairs, the stairs may be composed of stair units. The stair unit includes, for example, a stair main body and a plurality of pillars that support it. In that case, when installing the stair unit, it is conceivable to install a stair unit by providing a facility foundation for each column part and supporting the column part by each facility foundation. Here, in such a structure, when ground improvement is performed for each equipment foundation, there is a risk that the cost and the construction period may be significantly increased. Therefore, in the present invention, in such a configuration, each facility foundation is connected to the rising portion of the building foundation by a connecting means. In this case, it is possible to eliminate the need for ground improvement for the ground below each equipment foundation, and as a result, the above-described effects of reducing costs and shortening the construction period can be obtained as a great effect.

The top view which shows the 1st floor part of an apartment house. The top view which shows the basic structure in shared stairs periphery. BB sectional drawing of FIG. The top view which shows the bar arrangement structure of each stairs foundation. The longitudinal cross-sectional view which shows the bar arrangement structure of the foundation for buildings and the foundation for stairs. (A) is a top view which shows the bar arrangement structure of the foundation for stairs, (b) is a front view. (A) is a top view which shows the structure of a 1st anchor metal fitting and a 2nd anchor metal fitting, (b) is a front view. The figure for demonstrating the work procedure at the time of constructing a foundation structure.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The building of this embodiment is embodied as a two-story apartment house (for example, an apartment) having a plurality of dwelling units. FIG. 1 is a plan view showing a first floor portion of an apartment house.

  As shown in FIG. 1, the first floor portion 11 of the housing complex 10 is provided with a plurality of dwelling units 12 and a common corridor 13 that leads to the dwelling units 12. Each dwelling unit 12 is provided with a doorway 14, through which it is possible to enter and exit the dwelling unit 12 from the shared corridor 13. In addition, the common hall 13 can be accessed through the common entrance 16 from outside. In addition, although illustration is abbreviate | omitted, the 2nd floor part is provided with several dwelling units and the common corridor which leads to each dwelling unit similarly to the 1st floor part 11.

  The shared hallway 13 on the first floor portion 11 and the shared hallway on the second floor portion are connected by a shared staircase 17. The common staircase 17 is a rotating staircase and is installed in a staircase room 18. The periphery of the staircase 18 is surrounded by a partition wall 19. An opening 21 for communicating the staircase 18 with the common hallway 13 is formed in a part of the partition wall 19.

  The shared staircase 17 is composed of a staircase unit 22. The stair unit 22 includes a staircase body 23 having a tread board and a kick board, and a plurality of pillar portions 24 (see FIGS. 2 and 3) that support the stair body 23 from below. ing. The stair unit 22 corresponds to a building facility.

  Next, the basic structure around the shared staircase 17 (in the region A in FIG. 1) will be described with reference to FIGS. FIG. 2 is a plan view showing a basic structure around the shared staircase 17. 3 is a cross-sectional view taken along line BB in FIG. In addition, in FIG. 2, each pillar part 24 of the stair unit 22 is shown collectively (the same is applied to FIG. 4 described later).

  As shown in FIG.2 and FIG.3, the building foundation 26 is provided under the partition wall 19 surrounding the common staircase 17 (stair unit 22). The building foundation 26 is provided along the partition wall 19 and is arranged in a square ring shape in a plan view. In addition, above the building foundation 26, pillars or the like (not shown) of the first floor portion 11 are installed.

  The building foundation 26 is made of a reinforced concrete cloth foundation, and includes a footing portion 27 embedded in the ground and a rising portion 28 that rises upward from the footing portion 27. The footing unit 27 is provided on a crushed stone layer 29 on which crushed stones are spread. The footing unit 27 corresponds to a basic slab.

  Inside the building foundation 26, building foundation reinforcement is disposed. The building basic bar arrangement includes a base bar arrangement section 31 provided substantially horizontally in the footing section 27 and a rising bar arrangement section 32 raised upward from the base bar arrangement section 31. In addition, the bar arrangement structure in this embodiment is a single bar arrangement.

  The base reinforcing bar 31 includes a pair of base reinforcing bars 33 extending in the longitudinal direction of the building foundation 26 and a plurality of base reinforcing bars 34 extending in the width direction of the building foundation 26 (footing part 27). The plurality of base bars 34 are fixed to the respective base force distribution bars 33 by welding or the like. In addition, the base distribution bar 33 and the base bar 34 are formed of deformed reinforcing bars.

  The rising bar arrangement portion 32 includes an upper main bar 36, an abdominal muscle 37, and a lower main bar 38 that extend in the longitudinal direction of the building foundation 26, and a rib 39 that extends in the vertical direction. In this case, the upper main muscle 36, the abdominal muscle 37, and the lower main muscle 38 correspond to horizontal reinforcing bars, and the ribs 39 correspond to vertical reinforcing bars. The upper main muscle 36, the abdominal muscle 37, the lower main muscle 38, and the rib muscle 39 are all formed of deformed reinforcing bars.

  The upper main bar 36 is disposed at the upper end of the rising reinforcing bar 32, the lower main bar 38 is disposed at the lower end of the rising bar 32, and the abdominal muscle 37 is disposed substantially at the center of the main reinforcing bars 36, 38. Yes. The upper main muscle 36, the abdominal muscle 37, and the lower main muscle 38 are all fixed to the rib 39 by welding or the like. A plurality of streaks 39 are arranged at predetermined intervals in the longitudinal direction of the building foundation 26.

  The rising reinforcing bar 32 is provided in a state where the lower main bar 38 is placed on the base bar 34 of the base reinforcing bar 31.

  Each column part 24 of the stair unit 22 is installed on the inner side surrounded by the rising part 28 of the building foundation 26 arranged in a square ring shape. Each column part 24 is installed in the vicinity of the rising part 28 of the building foundation 26, and is arranged at a predetermined interval along the inner periphery of the rising part 28. The column portion 24 includes a column main body 41 extending downward from the staircase main body 23 and a column base portion 42 fixed to the lower end portion of the column main body 41 (see also FIG. 5). The column main body 41 is composed of a square steel pipe. The column base part 42 is installed on the crushed stone layer 45 in which the crushed stone is spread through the laid iron plate 44. The crushed stone layer 45 is provided at a position higher than the footing portion 27 of the building foundation 26 on the ground, and is disposed on the side of the rising portion 28. Note that the column base portion 42 has an adjustment function of adjusting the length of the column portion 24 by adjusting the height position of the column main body 41.

  Each column portion 24 of the stair unit 22 is supported by a stair foundation 50. Hereinafter, the configuration of the stair foundation 50 will be described with reference to FIGS. 4 to 6 in addition to FIGS. 2 and 3. FIG. 4 is a plan view showing a bar arrangement structure of each stair foundation 50. FIG. 5 is a longitudinal sectional view showing the bar arrangement structure of the building foundation 26 and the stair foundation 50. FIG. 6A is a plan view showing a bar arrangement structure of the stair foundation 50, and FIG. 6B is a front view. In addition, in FIG. 4, it has shown in the state which removed the concrete part of each foundation 50 for stairs. In FIG. 5, for convenience, the outlines of the building foundation 26 and the stair foundation 50 are indicated by two-dot chain lines (virtual lines). Further, in FIG. 6 as well, the outline of the stair foundation 50 is indicated by a two-dot chain line (virtual line).

  As shown in FIGS. 2 and 3, a plurality of (specifically, six) stair foundations 50 are provided for each column portion 24 of the stair unit 22. Each of the stair foundations 50 is formed in a rectangular parallelepiped shape, and has a square shape in plan view. Specifically, each of the stairs foundations 50 is formed in the same size and shape, and more specifically, the stairs foundation bar arrangement (details will be described later) arranged in the interior is the same. As described above, the design load is reduced by sharing the configuration of the stair foundations 50. Each stair foundation 50 corresponds to a facility foundation.

  The stair foundation 50 is provided on the side of the rising portion 28 of the building foundation 26 and is continuous with the rising portion 28. That is, the stair foundation 50 is disposed in a state where one side surface thereof is in contact with the inner side surface of the rising portion 28. The stair foundation 50 is provided on the crushed stone layer 45, in other words, on the ground. Therefore, unlike the building foundation 26, the stair foundation 50 has a configuration that does not have a foundation slab (footing portion) embedded in the ground.

  The lower end side of the column part 24 of the stair unit 22 is embedded in the stair foundation 50. As shown in FIGS. 4 and 5, a fixing plate 53 is fixed to the lower end side of the column portion 24 (column body 41). The fixed plate 53 is made of a flat steel plate and has a hole 53a (see FIG. 4) through which the column main body 41 is inserted. The fixing plate 53 is fixed to the column main body 41 by welding in a state where the column main body 41 is inserted into the hole 53a. The fixed plate 53 is embedded in the staircase foundation 50, and the upper surface thereof is located on the same plane as the upper surface of the staircase foundation 50. Incidentally, the upper surface of the staircase foundation 50 (fixed plate 53) is set at a position lower than the upper surface of the building foundation 26 (rise portion 28).

  A pair of anchor portions 54 are fixed to the fixed plate 53. The anchor part 54 is configured by a deformed reinforcing bar. The anchor portion 54 extends in the vertical direction, and the lower end side thereof is bent sideways. The anchor portion 54 is fixed to the fixed plate 53 at the upper end portion thereof. In detail, the fixing portion 53 is formed with a male screw portion (not shown) at the upper end portion of the anchor portion 54, and the upper end portion having the male screw portion is inserted into a hole portion (not shown) formed in the fixing plate 53. Yes. The anchor portion 54 is fixed to the fixed plate 53 by fastening the pair of nuts 56 to the male screw portion so as to sandwich the fixed plate 53 in the inserted state.

  A portion below the fixed plate 53 in the anchor portion 54 is embedded in the stair base 50. Thereby, the column part 24 is being fixed to the foundation 50 for steps via the anchor part 54 (and fixing plate 53). The length of the portion embedded in the stair foundation 50 in the anchor portion 54 is set to be more than half the vertical dimension (height dimension) of the stair foundation 50. It is set to approximately the same length as the dimension.

  As shown in FIGS. 4 to 6, stair foundation reinforcement is disposed inside the stair foundation 50. The staircase basic bar arrangement has a plurality (specifically, four) main bars 58 extending in the vertical direction, and hoop bars 59 (shear reinforcement bars) provided so as to bundle the main bars 58. Both the main bar 58 and the hoop bar 59 are formed of deformed bars.

  Each main muscle 58 is disposed at the four corners of the stair base 50 in plan view. The main bar 58 includes a vertical bar 58a extending in the vertical direction, a bent part 58b extending in an arc shape (semi-arc) from the upper end of the vertical bar 58a, and a horizontal bar 58c extending laterally from the lower end of the vertical bar 58a. And have. In this case, in each main reinforcing bar 58, both the bent part 58b and the horizontal reinforcing part 58c extend from the vertical reinforcing part 58a toward the center of the stair foundation 50 in plan view.

  The hoop line 59 is formed in a quadrangular ring shape in plan view, and more specifically has a square shape. A plurality (specifically, two) of hoop lines 59 are provided at predetermined intervals in the vertical direction. The hoop muscles 59 are provided so as to bundle the main muscles 58 from the outside. In this case, at the four corner positions of each hoop bar 59, the vertical bar part 58a of each main bar 58 is arranged in the inner part thereof, and the hoop bar 59 is coupled to each of the vertical bar parts 58a using a wire or the like.

  The column part 24 (column body 41) of the stair unit 22 is inserted inside each hoop line 59. In this case, the column part 24 is disposed in a state surrounded by the hoop line 59.

  Next, a connection structure for connecting the stair foundation 50 to the rising portion 28 of the building foundation 26 will be described with reference to FIG. 7 in addition to FIGS. 4 and 5. 7A is a plan view showing the configuration of the first anchor fitting 61 and the second anchor fitting 62, and FIG. 7B is a front view.

  As shown in FIGS. 4 and 5, the first anchor fitting 61 is embedded in the rising portion 28 of the building foundation 26, and the second anchor fitting 62 is embedded in the stair foundation 50. The first anchor fitting 61 and the second anchor fitting 62 are connected to each other, whereby the rising portion 28 and the stair base 50 are connected to each other. In addition, it has the 1st anchor metal fitting 61 and the 2nd anchor metal fitting 62, and the in-foundation coupling tool and the connection means are comprised.

  As shown in FIGS. 4, 5, and 7, the first anchor fitting 61 includes a connection plate 64 and a pair of anchor portions 65 fixed to the connection plate 64. The connecting plate 64 is made of a flat steel plate and has a rectangular shape that is long in the vertical direction. The connecting plate 64 is embedded in the rising portion 28 with its plate surface being flush with the side surface (on the stair foundation 50 side) of the rising portion 28. In this case, the plate surface of the connecting plate 64 is exposed to the side from the rising portion 28. The connection plate 64 corresponds to the first connection part.

  The anchor portion 65 is formed by bending a deformed reinforcing bar, and its entire length is longer than the thickness dimension of the rising portion 28. The anchor portion 65 is fixed to a plate surface of the connecting plate 64, specifically, a plate surface on the inner side of the rising portion 28 (hereinafter also referred to as an inner plate surface), and the whole is embedded in the rising portion 28. A plurality of anchor portions 65 (specifically, a pair) are provided at a predetermined interval in the width direction (left-right direction) of the connecting plate 64. The anchor portion 65 corresponds to the first anchor portion.

  The anchor portion 65 extends in the vertical direction and is fixed to the inner plate surface of the connection plate 64 by welding, a fixed portion 65a, a horizontal portion 65b extending from the upper end of the fixed portion 65a to the side away from the connection plate 64, And a vertical portion 65c extending downward from the end portion of the portion 65b on the side to be separated. The horizontal portion 65 b extends in the thickness direction of the rising portion 28 across the upper end main reinforcement 36. In this case, the horizontal portion 65 b intersects the upper end major bar 36 above the upper end major bar 36. The horizontal portion 65b corresponds to the first portion.

  The vertical portion 65c extends downward from the upper end main reinforcement 36 from the horizontal portion 65b. In this case, the vertical portion 65 c intersects with the upper end main reinforcement 36 on the opposite side of the connection plate 64 with the upper end main reinforcement 36 interposed therebetween. Moreover, the length of the vertical part 65c is longer than the fixed part 65a, and more specifically, is longer than twice the length of the fixed part 65a. The vertical portion 65c corresponds to the second portion.

  A plurality of embedded nuts 66 are fixedly welded to the inner plate surface of the connecting plate 64 at a predetermined interval in the vertical direction. These embedded nuts 66 are arranged at the center in the width direction of the connecting plate 64. Further, each embedded nut 66 is disposed at an intermediate portion of each anchor portion 65 in the width direction, and more specifically, is disposed at a central portion of each anchor portion 65. Bolts can be fastened to the embedded nuts 66 from the exposed surface side of the connecting plate 64 (that is, the plate surface side opposite to the inner plate surface).

  The second anchor fitting 62 includes a connection plate 68 and a pair of anchor portions 69 fixed to the connection plate 68. The connection plate 68 is made of a flat steel plate and has a rectangular shape that is long in the vertical direction. The plate surface of the connecting plate 68 is in contact with the plate surface of the connecting plate 64 of the first anchor fitting 61 and is fixed to the connecting plate 64 with bolts 73 in this state. Specifically, the bolt 73 is fastened to the embedded nut 66 of the connection plate 64 via the connection plates 64 and 68, whereby the connection plate 68 is fixed to the connection plate 64 of the first anchor fitting 61. Further, in this fixed state, the entire connecting plate 68 is embedded in the staircase foundation 50. The connecting plate 68 corresponds to the second connecting portion.

  The anchor portion 69 is formed by bending a deformed reinforcing bar, and its entire length is longer than the width dimension of the stair foundation 50. The anchor portion 69 is fixed to a plate surface of the connecting plate 68, specifically, a plate surface on the inner side of the stair base 50 (hereinafter also referred to as an inner plate surface), and the entirety thereof is embedded in the stair base 50. A plurality (specifically, a pair) of anchor portions 69 are provided at a predetermined interval in the width direction (left-right direction) of the connecting plate 68. Each anchor portion 69 is disposed at the same position as each anchor portion 65 of the first anchor fitting 61 in the width direction. The anchor portion 69 corresponds to the second anchor portion.

  The anchor portion 69 includes a fixing portion 69a that is welded and fixed to the inner plate surface of the connection plate 68, a horizontal portion 69b that extends from the fixing portion 69a to the side away from the connection plate 68, and the above-mentioned separation side of the horizontal portion 69b. And a vertical portion 69c extending downward from the end portion.

  As shown in FIG.2 and FIG.3, the embankment part 76 is formed in the area | region where the foundation 50 for steps is not arrange | positioned in the inner side enclosed by the standing part 28 of the building foundation 26. . The embankment portion 76 is at a position where the upper surface is higher than the crushed stone layer 45 below the stair foundation 50. A crushed stone layer 72 laid with crushed stone is provided on the embankment portion 76, and a soil concrete 71 is laid on the crushed stone layer 72. The top surface of the soil concrete 71 is set at the same height as the top surface of the staircase foundation 50.

  A mortar layer 74 is continuously provided on the upper surface of the soil concrete 71 and the upper surface of each stair foundation 50. The mortar layer 74 forms the floor surface (soil floor surface) of the staircase 18. Further, the upper end portion (including the nut 56) of the anchor portion 54 exposed upward from the stair foundation 50 is covered with the mortar layer 74. In FIG. 4, the mortar layer 74 is not shown for convenience. Moreover, in FIG. 5, the mortar layer 74 is shown with the dashed-two dotted line (imaginary line).

  Next, an operation procedure for constructing the above-described foundation structure will be described with reference to FIG. FIG. 8 is a diagram for explaining the work procedure.

  When constructing the foundation structure, first, as shown in FIG. 8A, a building foundation placing process for placing the building foundation 26 and a soil placing process for placing the soil concrete 71 are performed. By performing these steps, a recess 78 (box-out portion) is formed at a location where each stair foundation 50 is disposed. In this state, the connection plate 64 of the first anchor fitting 61 is exposed toward the recess 78 on the side surface of the rising portion 28 of the building foundation 26.

  Note that either the building foundation placing step or the soil placing step may be performed first or simultaneously. Further, regarding the ground below the building foundation 26, it is assumed that ground improvement (for example, surface layer improvement) has been performed in advance before the building foundation placing step.

  Next, as shown in FIG. 8 (b), a staircase basic bar arrangement process for arranging the main bar 58 and the hoop bar 59 in the recess 78 is performed.

  Next, as shown in FIG. 8C, an anchor fitting connecting step for connecting the second anchor fitting 62 to the first anchor fitting 61 is performed. In this step, the operation of connecting the connecting plate 68 of the second anchor fitting 62 to the connecting plate 64 of the first anchor fitting 61 exposed on the side surface of the rising portion 28 is performed. Specifically, the connection plates 64 and 68 are connected by fastening the bolt 73 to the embedded nut 66 of the connection plate 64.

  Next, as shown in FIG. 8D, a staircase installation step of installing the staircase unit 22 is performed. In this step, an operation of installing each column portion 24 of the stair unit 22 in the recess 78 is performed. In this installation, the column part 24 is installed while passing through the inside of the hoop muscle 59. In addition, after such installation work is completed, the anchor portion 54 is fixed to the fixing plate 53 fixed in advance to the column portion 24 using the nut 56.

  Next, as shown in FIG. 8 (e), a staircase foundation placing step of forming the stair foundation 50 by placing concrete in the recess 78 is performed. Thereby, the lower end side of the column part 24 will be in the state embed | buried under the inside of the foundation 50 for stairs.

  Next, as shown in FIG. 8 (f), a mortar layer forming step of forming a mortar layer 74 on the upper surface of the stair foundation 50 and the upper surface of the soil concrete 71 is performed.

  As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  The stair foundation 50 is provided on the side of the rising portion 28 of the building foundation 26 and connected to the rising portion 28 using connecting means (specifically, the first anchor fitting 61 and the second anchor fitting 62). In this case, since the load of the stair unit 22 acting on the stair foundation 50 can be applied to the building foundation 26, ground improvement can be made unnecessary for the ground below the stair foundation 50. Therefore, it is possible to reduce costs and shorten the construction period.

  The anchor fittings 61 and 62 (corresponding to the in-foundation couplers) are provided in a state of straddling the inside of the rising portion 28 and the inside of the stair foundation 50, and the rising portion 28 and the The stairs foundation 50 was connected. In this case, since the stair foundation 50 can be firmly connected to the rising portion 28, the load of the stair unit 22 acting on the stair foundation 50 can be suitably applied to the building foundation 26.

  A connection plate 64 exposed to the side of the rising portion 28 is provided on the first anchor fitting 61, and a connection plate 68 connected to the connection plate 64 is provided on the second anchor fitting 62. In this case, it is possible to manufacture the stair foundation 50 after manufacturing the building foundation 26. That is, after the building foundation 26 is manufactured, the second anchor metal fitting 62 (connection plate 68) is connected to the connection plate 64 exposed from the rising portion 28 in the first anchor metal fitting 61, and then concrete is laid to make a staircase. It becomes possible to manufacture the foundation 50 for use. Thereby, after the building foundation 26 is manufactured, the lower end side of the column portion 24 of the stair unit 22 is arranged in the concrete placement region (that is, the concave portion 78), and the concrete is placed in the arrangement state, whereby the column The column portion 24 can be installed in a state where a part of the portion 24 is embedded in the stair foundation 50.

  By the way, in the above-described configuration in which the stair foundation 50 is connected to the rising portion 28 via the anchor fittings 61 and 62, the load of the stair unit 22 also acts on the first anchor fitting 61. Therefore, in the above embodiment, in view of this point, the anchor portion 65 of the first anchor fitting 61 is provided with the horizontal portion 65b extending over the upper end main reinforcement 36. In this case, since the load of the stair unit 22 acting on the first anchor fitting 61 can be supported not only by the concrete but also by the upper end main reinforcement 36, the load of the stair unit 22 can be supported in a stable state.

  The anchor portion 65 is provided with a vertical portion 65 c that extends across the upper end main bar 36 on the opposite side of the connection plate 64 across the upper end main bar 36. In this case, when an external force is applied to the stair unit 22 and a pulling force from the rising portion 28 acts on the first anchor fitting 61, the pulling force can be received not only by the concrete but also by the upper end main reinforcement 36. Thereby, the stair foundation 50 can be connected to the rising portion 28 in a more stable state.

  In the configuration in which the stair unit 22 is installed, the stair unit 50 may be installed by providing a stair base 50 for each column part 24 and supporting the column part 24 by each stair base 50. In such a configuration, if the ground is improved for each stair foundation 50, there is a risk that the cost and the construction period will be significantly increased. Therefore, in the above-described embodiment, each stair foundation 50 is connected to the rising portion 28 of the building foundation 26 via the anchor fittings 61 and 62 in such a configuration. In this case, since ground improvement can be made unnecessary for the ground below each stair foundation 50, the above-described effect of reducing costs and shortening the construction period can be obtained as a great effect.

  By the way, when installing each pillar part 24 of the stair unit 22 on the stair foundation 50, it may be necessary to fix the lower end of the pillar part 24 to the stair foundation 50 using an anchor bolt. In that case, for example, an anchor bolt insertion hole is provided in the fixing plate of the pillar portion 24, an anchor bolt insertion hole is also provided on the stair foundation 50 side, and the anchor bolt is inserted into each insertion hole. It is conceivable to fix the column portion 24 to the stair foundation 50. Here, in such a configuration, when the stair unit 22 (column 24) is installed on the stair foundation 50, the insertion hole on the column 24 (fixed plate) side and the insertion hole on the stair foundation 50 side are provided. Although it is necessary to install in a state of alignment, it is considered that it is very difficult to perform the alignment for each column part 24. In that respect, in the above embodiment, since the column portion 24 is installed in a state where a part (lower end side) of the column portion 24 is embedded in the stair base 50, the above-described alignment is not required, and the stair unit The installation work 22 can be performed relatively easily.

  The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  (1) The configuration of the anchor portion 65 of the first anchor fitting 61 is not necessarily limited to that of the above embodiment. For example, in the above-described embodiment, the horizontal portion 65b of the anchor portion 65 is disposed so as to straddle the upper main muscle 36, but this may be changed and the horizontal portion 65b may be disposed so as to straddle the abdominal muscle 37. Also in this case, since the load of the stair unit 22 acting on the first anchor fitting 61 can be supported not only by the concrete but also by the abdominal muscle 37, the stair unit 22 can be supported in a stable state.

  In the above configuration, the anchor portion 65 may be provided with a horizontal portion (hereinafter referred to as a second horizontal portion) extending in the longitudinal direction of the building foundation 26 from the horizontal portion 65b, instead of the vertical portion 65c. Then, the second horizontal portion may be arranged so as to intersect the stirrup 39 on the side opposite to the connecting plate 64 with the stirrup 39 interposed therebetween. Even in that case, when an external force is applied to the staircase unit 22 and a pulling force from the rising portion 28 acts on the first anchor fitting 61, the pulling force is received not only by the concrete but also by the second horizontal portion. it can. Therefore, the stair foundation 50 can be connected to the rising portion 28 in a stable state.

  The anchor portion 65 may not be provided with the vertical portion 65c.

  (2) The configuration of the anchor portion 69 of the second anchor fitting 62 is not necessarily limited to that of the above embodiment. For example, in the above embodiment, the vertical portion 69c is provided in the anchor portion 69, but a horizontal portion extending in the left-right direction may be provided instead of the vertical portion 69c.

  (3) In the above embodiment, the column part 24 of the stair unit 22 is embedded in the stair base 50. However, the column part 24 of the stair unit 22 may be installed on the stair base 50. Good. In this case, after placing the stair foundation 50, the stair unit 22 (column portion 24) may be installed. In addition, when setting it as this structure, it is possible to fix the fixing plate 53 of the pillar part 24 to the base 50 for stairs using an anchor bolt.

  (4) As explained in the above (3), when the pillar portion 24 is installed above the stair foundation 50, the building foundation 26 and the stair foundation 50 may be integrally (simultaneously) placed. In that case, it is conceivable to embed a reinforcing bar (corresponding to the in-foundation connector) in a state of straddling the inside of the building foundation 26 and the inside of the stair foundation 50. That is, when constructing the foundation, it is conceivable that such reinforcing bars are arranged in advance, and the building foundation 26 and the stair foundation 50 are integrally formed by placing concrete in that state. Also in this case, since the reinforcing bars are disposed across the interior of the building foundation 26 and the interior of the stair foundation 50, the stair foundation 50 can be firmly connected to the building foundation 26.

  (5) In the above embodiment, the anchor fittings 61 and 62 are provided straddling the inside of the rising portion 28 of the building foundation 26 and the inside of the stair foundation 50, and are raised by the anchor fittings 61 and 62 (connection means). Although the part 28 and the stairs foundation 50 are connected, this may be changed. For example, an L-shaped connecting bracket may be provided so as to straddle the side surface of the rising portion 28 and the side surface of the stair foundation 50, and the rising portion 28 and the stair foundation 50 may be connected by the connecting bracket. Good.

  (6) In the above embodiment, the staircase unit 22 is installed indoors in the apartment house 10 (building). However, the staircase unit 22 may be installed outdoors with respect to the building. In that case, the foundation structure of the present invention may be applied to the stair foundation of the stair unit 22 (outer stair unit).

  Moreover, as building equipment installed indoors or outdoors in a building, in addition to the stair unit 22, a heat pump type electric hot water supply device, a storage battery, and the like can be given. Since these building facilities are also heavy, it is assumed that the installation will be performed using the equipment foundation. Therefore, in such a case, the basic structure of the present invention may be applied.

  (7) In the above embodiment, the building foundation 26 is constructed as a cloth foundation, but the building foundation may be constructed by a solid foundation or an independent foundation. Solid foundations and independent foundations also have rising parts that rise upward from the foundation slab. Therefore, you may make it connect an installation foundation (for example, a 1st anchor metal fitting and a 2nd anchor metal fitting) to the standing part of the building foundation which consists of a solid foundation or an independent foundation.

  DESCRIPTION OF SYMBOLS 10 ... Apartment house as a building, 22 ... Stair unit as building equipment, 23 ... Stair body, 24 ... Pillar part, 26 ... Building foundation, 27 ... Footing part as foundation slab, 28 ... Standing part, 36 ... Horizontal reinforcement Top bar, 37 ... abdominal muscle as horizontal reinforcing bar, 38 ... bottom main bar as horizontal reinforcing bar, 50 ... stair foundation as equipment foundation, 61 ... first anchor fitting, 62 ... second anchor fitting, 64 ... first Connection plate as a connection portion, 65. Anchor portion as a first anchor portion, 65 b. Horizontal portion as a first portion, 65 c. Vertical portion as a second portion, 68 ... Connection plate as a second connection portion, 69. ... An anchor portion as a second anchor portion.

Claims (6)

The building foundation that supports the building,
A facility foundation for supporting building facilities installed inside or outside the building,
The building foundation has a foundation slab embedded in the ground, and a rising portion that rises upward from the foundation slab,
The equipment foundation is provided on a side of the rising portion on the ground,
A building foundation structure comprising a connecting means for connecting the facility foundation to the rising portion.   The foundation structure of a building according to claim 1, wherein the connecting means is an in-foundation connector provided across the inside of the rising portion and the inside of the equipment foundation. The in-foundation connector includes a first anchor fitting embedded in the rising portion and a second anchor fitting embedded in the facility foundation,
The first anchor fitting has a first connecting portion that is exposed to the side of the rising portion, and a first anchor portion that extends inward from the first connecting portion to the rising portion,
The said 2nd anchor metal fitting has a 2nd connection part connected with the said 1st connection part, and a 2nd anchor part extended inward of the said equipment foundation from the said 2nd connection part, It is characterized by the above-mentioned. 2. The basic structure of the building described in 2. Inside the rising portion, a horizontal reinforcing bar extending in the longitudinal direction of the building foundation is disposed,
The foundation structure of a building according to claim 3, wherein the first anchor portion extends over the horizontal reinforcing bar. Inside the rising portion, a plurality of basic reinforcing bars including the horizontal reinforcing bars are arranged,
The first anchor portion intersects the base reinforcing bar on the opposite side of the first connecting portion across the base reinforcing bar and the first portion extending in the thickness direction of the rising portion across the horizontal reinforcing bar. The building foundation structure according to claim 4, further comprising a second portion extending in a vertical direction. The building facility is a stair unit having a staircase body having a tread board and a kick board, and a plurality of pillars that support the stair body from below,
The building foundation is arranged in a square ring shape in plan view,
Each column part of the staircase unit is installed on the inner side surrounded by the rising part of the building base of the square ring shape,
A plurality of the facility foundations are provided for each column of the stair unit,
Each of these pillars is supported by the equipment foundation,
The building foundation structure according to any one of claims 1 to 5, wherein each of the facility foundations is connected to the rising portion by the connecting means.

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