Architectural structure and method for constructing the same

Abstract

To provide an architectural structure in which at least a side wall of a building and a soil cement column row type continuous wall constructed around the building are joined, the architectural structure exhibiting high resistance to both a pushing-in load and a pulling-out load applied from a building and including a soil cement column row type continuous wall, and a method for constructing the architectural structure.SOLUTION: An architectural structure 200 in which at least a side wall 15 of an underground part 11 of a building 10 in a foundation G and a soil cement column row type continuous wall 20 provided around the building 10 are joined, the soil cement column row type continuous wall 20 having a core material 40 buried in soil cement 30, comprises: a perforated steel plate 61; and a frame-shaped protrusion 68 provided around a hole 65 in the wide surface 62 of the perforated steel plate 61. The end 63 of the perforated steel plate 61 of a shear connector 60 is joined at least below the core material 40.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a building and a construction method thereof. [Background technology]

[0002] Retaining walls include prefabricated sheet pile walls such as horizontal sheet pile walls and steel sheet pile walls, and cast-in-place walls such as column-row walls and continuous underground walls. Column-row walls include cast-in-place reinforced concrete column-row walls, steel pipe column-row walls, and soil cement column-row walls (soil cement column-row continuous walls).

[0003] For example, while the above-mentioned soil cement diaphragm wall is a temporary structure, there is also a form in which the soil cement diaphragm wall is used as part of the foundation of a permanent building by being connected to the side walls of the underground portion of the building. In this way, by using the soil cement diaphragm wall not only as an earth retaining wall but also as part of the foundation of the permanent structure, the structure of the foundation of the permanent structure can be simplified, and for example, the amount of concrete and rebar in the foundation can be reduced, thereby significantly reducing construction costs. For example, Patent Document 1 proposes a method in which, when constructing the underground structure of a building after the construction of the soil cement diaphragm wall, shear connectors or the like are attached to the soil cement diaphragm wall, and the soil cement diaphragm wall and the underground structure of the building are constructed as a single unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4466418 Summary of the Invention [Problem to be solved by the invention]

[0005] Here, a specific configuration in which the above-mentioned soil cement diaphragm wall is used as part of the foundation of a building, which is a permanent structure, will be explained with reference to Figures 1 and 2. Figure 1 is a vertical cross-sectional view showing an example of a building, and Figure 2 is a view taken along the line II-II in Figure 1.

[0006] The illustrated building 100 is constructed by joining the side walls 15 and base 17 of the underground section 11 of a building 10 located in the ground G to a soil cement diaphragm column wall 20 constructed around the periphery of the building 10. For example, a soil cement diaphragm column wall 20 having a rectangular frame shape in plan view is constructed around the side walls 15 of the underground section 11 of the building 10, which is rectangular in plan view, and the two are joined at multiple locations. Fig. 1 shows only the side walls 15, base 17, and some of the columns 16 of the building 10.

[0007] The soil cement column-type continuous wall 20 is constructed by overlapping portions of the soil cement 30, which is circular in plan view, with a core material 40 made of H-shaped steel having a web 41, a first flange 42 on the building 10 side, and a second flange 43 on the opposite side of the building 10, buried inside the soil cement 30 within the circular hole G1 in plan view.

[0008] Of the core material 40 buried in the soil cement 30, a shear connector 50 consisting of a plurality of headed studs is joined by welding or the like to the first flange 42 on the upper building 10 side, and protrudes laterally, and the protruding shear connector 50 is embedded in the side wall 15 or base 17 of the underground portion 11, thereby integrating the building 10 with the soil cement diaphragm column wall 20. The weight of the building 10 and the compressive force generated when the building is displaced during an earthquake are transmitted as compressive load N1 from the building 10 to the core material 40 via the shear connector 50.

[0009] Below the web 41 of the core material 40, a plurality of shear connectors 45 are joined by welding or the like, protrude out to the sides of the web 41, and are embedded inside the soil cement 30. The compressive force N1 transmitted to the core material 40 is transmitted to the soil cement 30 around the core material 40 via the tip and circumferential surface of the core material 40 and the shear connectors 45, and the compressive force N1 is transmitted from the soil cement 30 to the surrounding ground G via the circumferential friction force between the soil cement 30 and the surrounding ground G, thereby ensuring the bearing capacity of the soil cement continuous column wall 20.

[0010] However, the surface of the core material 40 is smooth, the friction between the core material 40 and the soil cement 30 is small, and the tip area of the core material 40 made of H-shaped steel as shown in Figure 2 is small compared to the total area of the soil cement column-type continuous wall 20, for example, and therefore it is difficult to expect a large tip bearing capacity. For these reasons, there is room for improvement in the strength (bearing capacity) of the soil cement column-type continuous wall 20 against the compressive load.

[0011] On the other hand, in a configuration in which the soil cement diaphragm column wall 20 is used as part of the foundation of a permanent structure, when a horizontal force during an earthquake acts on the building 10, causing the building 10 to displace, and when a pull-out force N2 (pull-out load) occurs in the building 10 due to this displacement, this pull-out load N2 is also transmitted to the core material 40 via the shear connectors 50. In this case, a large pull-out resistance cannot be expected from the rod-shaped shear connectors 45 attached below the core material 40, and considering that the frictional force between the soil cement 30 and the core material 40 is small as described above, there is a risk that the core material 40 will be pulled out of the soil cement 30.

[0012] As explained above, by using a soil cement continuous column wall as part of the foundation of a permanent structure, construction costs can be significantly reduced. However, conventional soil cement continuous column walls have room for improvement in terms of their resistance to the indentation and pull-out loads acting from the permanent structure, and there are issues such as poor installation when installing the core material into the soil cement. Therefore, there is a demand for buildings equipped with soil cement continuous column walls that have high resistance to both indentation and pull-out loads.

[0013] The present invention has been made in view of the above-mentioned problems, and aims to provide a building equipped with a soil cement diaphragm wall that has high resistance to both push-in loads and pull-out loads acting from the building, and a construction method for the building, in which at least the side walls of the building are joined to a soil cement diaphragm wall constructed around the building. [Means for solving the problem]

[0014] In order to achieve the above object, one aspect of the building according to the present invention is as follows: A building in which at least a side wall of an underground portion of a building located in the ground is joined to a soil cement continuous column wall provided around the building, and the soil cement continuous column wall has a steel core material buried inside the soil cement, The shear connector comprises a perforated steel plate and a frame-shaped protrusion provided around the hole on the wide surface of the perforated steel plate, and is characterized in that the end of the perforated steel plate is joined to at least the lower part of the core material.

[0015] According to this aspect, a shear connector comprising a perforated steel plate and frame-shaped protrusions provided around the holes on its wide surface is joined at least below the core material constituting the soil cement column-type continuous wall, which is located within the ground and joined to at least the side walls of the underground part of the building.In this way, in addition to the shear resistance caused by the soil cement penetrating through the holes in the perforated steel plate, the frame-shaped protrusions exert a bearing resistance, resulting in a building with high resistance to both indentation loads and pull-out loads acting from the building.

[0016] Here, "at least the side walls of the building" includes both the side walls and the basement as well as the (underground) side walls of the building. Also, "shear connectors are joined at least below the core material" includes a configuration in which one or more shear connectors are joined below the core material, a configuration in which multiple shear connectors are joined in the range from the bottom to near the center of the core material, and a configuration in which multiple shear connectors are joined throughout the core material.

[0017] Another aspect of the building according to the present invention is The frame-shaped protrusions are provided around the holes on each of the two wide surfaces of the perforated steel plate.

[0018] According to this aspect, by providing frame-shaped protrusions around the holes on each of the two wide faces of the perforated steel plate, it is possible to further increase the bearing resistance.

[0019] Another aspect of the building according to the present invention is The core material is formed of an H-shaped steel, The shear connector is joined to one or both of the two wide surfaces of the web of the H-shaped steel.

[0020] According to this embodiment, by joining the shear connector to the wide surface of the web of the core material made of H-shaped steel, it is possible to form a building with high resistance to both indentation loads and pull-out loads acting from the building while applying conventional core materials.

[0021] Another aspect of the building according to the present invention is The core material is formed of an H-shaped steel, The shear connector is joined to the inner wide surface of the flange of the H-shaped steel.

[0022] According to this embodiment, a shear connector is joined to the inner wide surface of the flange of the core material made of H-shaped steel, making it possible to form a building with high resistance to both push-in loads and pull-out loads acting from the building while applying conventional core materials.

[0023] Another aspect of the building according to the present invention is A building in which at least a side wall of an underground portion of a building located in the ground is joined to a soil cement continuous column wall provided around the building, and the soil cement continuous column wall has a steel core material buried inside the soil cement, The core material has a hole at least in the lower part thereof, and a frame-shaped protrusion is provided around the hole on the wide surface of the core material to form a shear connector.

[0024] According to this aspect, holes are provided at least below the core material that constitutes the soil cement columnar continuous wall, which is located within the ground and connected to at least the side walls of the underground part of the building, and frame-shaped protrusions are provided around the holes to form shear connectors.In addition to the shear resistance caused by the soil cement penetrating the holes in the core material, the frame-shaped protrusions also exert bearing resistance, resulting in a building with high resistance to both indentation loads and pull-out loads acting from the building.

[0025] Another aspect of the building according to the present invention is The frame-shaped protrusions are provided around the holes on the two wide surfaces of the core material.

[0026] According to this aspect, the frame-shaped protrusions are provided around the holes on the two wide surfaces of the core material, thereby further increasing the bearing pressure resistance.

[0027] Another aspect of the building according to the present invention is The shape of the hole in a front view is a circle, an ellipse that is long in the vertical direction, or a polygon having at least a corner portion on the lower side, The frame-shaped protrusion has a shape that conforms to the shape of the hole when viewed from the front.

[0028] According to this embodiment, the front view shape of the hole is a circle, a vertically long oval, or a polygon with at least a corner at the bottom, and the shape of the frame-shaped protrusion is a shape that follows the front view shape of the hole. Therefore, when inserting and installing the core material into the soil cement, it becomes easier to cause the soil cement to flow sideways along the side of the frame-shaped protrusion, which results in good installation properties for the core material.

[0029] In addition, one aspect of the construction method for a building according to the present invention is as follows: A construction method for a building in which at least a side wall of an underground portion of a building located in the ground is joined to a soil cement diaphragm wall provided around the building, Step A is to construct a soil cement column-type continuous wall by erecting a core member formed of an H-shaped steel beam having a first flange on the building side, a second flange on the opposite side of the building, and a web inside the soil cement in the drilled hole; Step B: cutting the soil cement at the upper end of the soil cement diaphragm wall to expose a portion of the first flange, and joining a stud dowel to the exposed portion of the first flange; and a step C of constructing at least the side wall of the building that abuts against the first flange and embedding the stud dowel in the side wall to join the side wall of the underground portion and the soil cement columnar continuous wall to each other. In step A, an end of a shear connector is joined to at least the lower part of the core material, the shear connector comprising a perforated steel plate and a frame-shaped protrusion provided around the hole on the wide surface of the perforated steel plate.

[0030] According to this aspect, by applying a core material to which a shear connector comprising a perforated steel plate and a frame-shaped protrusion provided around the holes on the wide surface is joined at least below the core material that constitutes the soil cement column-type continuous wall, in addition to the shear resistance force due to the soil cement penetrating the holes in the perforated steel plate, the frame-shaped protrusions also exert a bearing resistance force, making it possible to construct a building with high resistance to both the pushing load and the pulling load acting from the building.

[0031] Furthermore, if the front view shape of the hole in the perforated steel plate is a circle, a vertically long oval, or a polygon with at least a lower corner, and the shape of the frame-shaped protrusion is a shape that matches the front view shape of the hole, when inserting and erecting the core material into the soil cement, the soil cement can be made to flow sideways along the side of the frame-shaped protrusion, which is preferable because it is a construction method that allows for good erection of the core material.

[0032] Another aspect of the construction method for a building according to the present invention is as follows: A construction method for a building in which at least a side wall of an underground portion of a building located in the ground is joined to a soil cement diaphragm wall provided around the building, Step A is to construct a soil cement column-type continuous wall by erecting a core member formed of an H-shaped steel beam having a first flange on the building side, a second flange on the opposite side of the building, and a web inside the soil cement in the drilled hole; Step B: cutting the soil cement at the upper end of the soil cement diaphragm wall to expose a portion of the first flange, and joining a stud dowel to the exposed portion of the first flange; and a step C of constructing at least the side wall of the building that abuts against the first flange and embedding the stud dowel in the side wall to join the side wall of the underground portion and the soil cement columnar continuous wall to each other. In the step A, a hole is provided at least below the core material, and a frame-shaped protrusion is provided around the hole on the wide surface of the core material to form a shear connector.

[0033] According to this aspect, by applying a core material that constitutes a soil cement columnar continuous wall that is located within the ground and connected to at least the side walls of the underground portion of a building, and that has holes at least below the core material and frame-shaped protrusions around the holes to form shear connectors, in addition to the shear resistance caused by the soil cement penetrating the holes in the core material, the frame-shaped protrusions exert bearing resistance, making it possible to construct a building that has high resistance to both indentation loads and pull-out loads acting from the building.

[0034] Furthermore, if the front view shape of the hole in the core material is a circle, a vertically long oval, or a polygon with at least a corner at the bottom, and the shape of the frame-shaped protrusion is a shape that matches the front view shape of the hole, when inserting the core material into the soil cement and erecting it, this is preferable because it makes it easier for the soil cement to flow sideways along the side of the frame-shaped protrusion, resulting in a construction method that allows the core material to be erected easily. [Effects of the Invention]

[0035] As can be understood from the above explanation, the building and construction method of the present invention can provide a building in which at least the side wall of a building is joined to a soil cement column-type continuous wall constructed around the building, and which has high resistance to both push-in loads and pull-out loads acting from the building. [Brief explanation of the drawings]

[0036] [Figure 1] FIG. 1 is a vertical cross-sectional view showing an example of a conventional building. [Figure 2]FIG. 2 is a view taken along the line II-II in FIG. [Figure 3] FIG. 2 is a longitudinal cross-sectional view showing an example of a building according to an embodiment, and is also a diagram illustrating step C of an example of a construction method for a building according to an embodiment. [Figure 4] FIG. 4 is a view taken along the line IV-IV in FIG. 3. [Figure 5A] FIG. 1 is a perspective view of an example shear connector. [Figure 5B] FIG. 10 is a perspective view of another example of a shear connector. [Figure 6A] FIG. 10 is a front view of yet another example shear connector joined to a web of a core. [Figure 6B] FIG. 10 is a front view of yet another example shear connector joined to a web of a core. [Figure 7] FIG. 10 is a front view showing a configuration in which the shear connector is joined to the inner surface of the flange. [Figure 8] FIG. 10 is a perspective view showing how the webs of the core form shear connectors. [Figure 9] FIG. 2 is a diagram illustrating step A of an example of a construction method for a building according to an embodiment. [Figure 10] FIG. 10 is a diagram illustrating step B of an example of a construction method for a building according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0037] Hereinafter, a building and a construction method thereof according to an embodiment will be described with reference to the accompanying drawings. In this specification and drawings, substantially identical components are designated by the same reference numerals, and redundant explanations may be omitted.

[0038] [Building according to the embodiment] First, an example of a building according to the embodiment will be described with reference to Figs. 3 to 8. Here, Fig. 3 is a longitudinal cross-sectional view showing an example of a building according to the embodiment, and Fig. 4 is a view taken along the line IV-IV in Fig. 3. Also, Figs. 5A and 5B are both perspective views of an example of a shear connector, and Figs. 6A and 6B are both front views of yet another example of a shear connector joined to the web of a core material. Furthermore, Fig. 7 is a front view showing a form in which a shear connector is joined to the inner surface of a flange, and Fig. 8 is a perspective view showing a form in which the web of a core material forms a shear connector. Note that Fig. 3 is also a diagram explaining step C of an example of a construction method for a building according to the embodiment, and will be referred to in the construction method described in detail below.

[0039] The illustrated building 200 is constructed by joining the side walls 15 and base 17 of the underground section 11 of a building 10 located in the ground G to a soil cement diaphragm wall 20 constructed around the building 10. For example, a soil cement diaphragm wall 20 having a rectangular frame shape in plan view is constructed around the side walls 15 of the underground section 11 of a building 10 that is rectangular in plan view, and the two are joined at multiple locations. Note that the shape of the building 10 in plan view is diverse, and the soil cement diaphragm wall 20 is constructed in a frame shape that corresponds to the shape of the building 10 in plan view.

[0040] The building 10 may be made of RC (Reinforced Concrete), S (Steel), SRC (Steel Reinforced Concrete), or a hybrid of these structures, and includes a variety of forms such as office buildings, apartment buildings, gymnasiums, shopping malls, and various public buildings. In the illustrated example below, the building will be described as having at least the side walls 15 and base 17 of the basement 11 made of reinforced concrete.

[0041] On the other hand, the soil cement continuous column wall 20 is constructed by overlapping portions of the soil cement 30, which is circular in plan view, with a core material 40 made of H-shaped steel embedded inside the soil cement 30 in the circular drilled hole G1 in plan view. Here, in addition to H-shaped steel, steel sheet piles, secondary concrete products, etc. may also be used as the core material.

[0042] The soil cement 30 is produced by mixing and stirring the earth and sand generated by excavating the ground G with cement milk discharged from the tip of a multi-shaft mixing auger or the like (not shown), and is constructed by inserting a core material 40 into the soil cement before it hardens.

[0043] The soil cement column-type continuous wall 20 shown in the figure not only serves as a retaining wall when constructing the building 10, but also functions as the foundation of the building 10 after it is constructed by being joined to the underground section 11 of the building 10.

[0044] Of the core material 40 buried in the soil cement 30, a shear connector 50 consisting of multiple stud dowels is welded to the first flange 42 on the upper building 10 side and protrudes laterally, and the protruding shear connector 50 is buried in the side wall 15 and base 17 of the underground portion 11, thereby integrating the building 10 and the soil cement column-type continuous wall 20.

[0045] In the soil cement continuous column wall 20, a core member 40 is embedded in the soil cement 30, and a plurality of shear connectors 60 are welded to each of the two wide faces 41a of the lower web 41 thereof.

[0046] As shown in Figures 3, 4, and 5A, the shear connector 60 comprises a perforated steel plate 61 and a frame-shaped protrusion 68 provided around a hole 65 on a wide surface 62 of the perforated steel plate 61, and an end surface 63 (end portion) of the perforated steel plate 61 is welded to the web 41.

[0047] The perforated steel plate 61 in the illustrated example is rectangular (square or rectangular) when viewed from the front, and has circular holes 65 (through holes) when viewed from the front provided in its wide surface 63. The linear shape of the frame-shaped protrusion 68 is circular and follows the linear shape of the holes 65, and therefore the frame-shaped protrusion 68 is cylindrical.

[0048] Here, the shear connector 60 may be a burring shear connector in which burring processing has been applied to a steel plate, or a shear connector in which a frame-shaped protrusion 68 is welded to the wide surface 62 of a perforated steel plate 61.

[0049] As shown in FIG. 4, in the soil cement diaphragm wall 20, the soil cement 30 is filled into the holes 65 of the perforated steel plates 61 of the shear connectors 60 and the inside of the frame-shaped projections 68.

[0050] 4, two shear connectors 60 at the same level are welded to two wide surfaces 41a of the web 41 of the core material 40 at positions spaced apart from each other. If the thickness of the web 41 is relatively thin, welding stress is likely to be generated in the web 41 by welding the shear connectors 60 to corresponding positions on the two wide surfaces 41a, so the shear connectors 60 are welded to positions spaced apart from each other as in the illustrated example. If the thickness of the web 41 is relatively thick and welding stress is unlikely to be generated in the web 41 even if shear connectors 60 are welded to corresponding positions on the two wide surfaces 41a, two shear connectors 60 at the same level may be welded to corresponding positions in the center of the web 41, for example.

[0051] As shown in Figure 5A, when the shear connector 60 (the core material 40 to which it is welded) is erected inside the soil cement 30 in the X1 direction, the frame-shaped protrusion 68 extending from the web 41 of the core material 40 is cylindrical, which makes it easier for the soil cement 30 to flow sideways in the X2 direction along its curved side, improving the erection properties of the core material 40.

[0052] For this reason, for example, the lower linear portion of the perforated steel plate may also be processed into a quarter circle or semicircle to make it easier for the soil cement 30 to flow laterally (not shown).

[0053] As shown in Fig. 4, soil cement 30 is filled into the holes 65 of the perforated steel plate 61 and the interior of the frame-shaped protrusions 68, and as shown in Fig. 5A, when a compressive load N1 or a pull-out load N2 acts on the core material (not shown), a shear resistance force S is exerted. Furthermore, because the shear connector 60 is provided with the frame-shaped protrusions 68, a bearing resistance force P is exerted by the frame-shaped protrusions 68. Note that Fig. 5A shows a state in which an upward bearing resistance force P is exerted on the lower side surface of the frame-shaped protrusions 68 in response to the compressive load N1, but a downward bearing resistance force is exerted on the upper side surface of the frame-shaped protrusions 68 in response to the pull-out load N2.

[0054] In this way, by welding the shear connector 60 to the lower part of the core material 40, a building 200 is formed that has high resistance to both the indentation load N1 and the pull-out load N2 acting from the building.

[0055] 5B, a shear connector 60A may be applied in which two frame-shaped protrusions 68 are provided around each hole 65 on the two wide surfaces 62 of a perforated steel plate 61. This shear connector 60A can further increase the bearing resistance.

[0056] Also, other example shear connectors shown in Figures 6A and 6B may be applied.

[0057] The shear connector 60B shown in FIG. 6A has an elliptical hole 65A that is long in the vertical direction when viewed from the front, and a frame-shaped protrusion 68A that follows the linear shape of the hole 65A.

[0058] Even when the connector 60B is applied, when the shear connector 60B is erected inside the soil cement 30 in the X1 direction, the frame-shaped protrusion 68B extending from the web 41 of the core material 40 is an ellipse that is long in the vertical direction, making it easier for the soil cement 30 to flow laterally in the X3 direction along the side of the frame-shaped protrusion 68B, improving the erection properties of the core material 40.

[0059] On the other hand, the shear connector 60C shown in Figure 6B has a pentagonal shape (an example of a polygon) when viewed from the front, with a hole 65B having one corner pointing downward, and a frame-shaped protrusion 68B shaped along the linear line of the hole 65B.

[0060] Even when the connector 60C is applied, when the shear connector 60C is erected inside the soil cement 30 in the X1 direction, the frame-shaped protrusion 68C extending from the web 41 of the core material 40 is pentagonal, with one corner located downward, making it easier for the soil cement 30 to flow laterally in the X4 direction along the side of the frame-shaped protrusion 68C, improving the erection properties of the core material 40.

[0061] Further, other examples of shear connectors shown in Figures 7 and 8 may also be applied.

[0062] 7 shows an example in which, instead of the web 41 of the core member 40 made of H-shaped steel, a plurality of shear connectors 60 are welded in a staggered pattern to the inner surfaces 42a, 43a of the first flange 42 and the second flange 43. Here, the inner surfaces (not shown) of the webs 41 of the first flange 42 and the second flange 43 extend to the rear side of the page, and a plurality of shear connectors 60 may be similarly joined to the rear side of the web 41.

[0063] 8 shows an example in which a plurality of holes 46 are formed in at least the lower web 41 of the core member 40 made of H-shaped steel, and a frame-shaped protrusion 48 is formed around the holes 46 on the wide surface of the web 41 to form a shear connector 44. When burring is used, the frame-shaped protrusion 48 is formed immediately after the holes 46 are formed in the web 41. Alternatively, after the holes 46 are formed in the web 41, a separately manufactured frame-shaped protrusion 48 may be welded to the periphery of the holes 46.

[0064] Here, in the illustrated example, the frame-shaped protrusion 48 is provided on one side of the hole 46, but the frame-shaped protrusion 48 may be provided on both sides of the hole 46.

[0065] In addition, in the illustrated example, the hole 46 is circular when viewed from the front, but as shown in Figures 6A and 6B, a hole having a vertically elongated oval shape or a hole having a polygonal shape with corners at the bottom may be used, and a frame-shaped protrusion shaped along each of the linear shapes may be used.

[0066] Furthermore, instead of the illustrated example in which holes 46 provided in web 41 form shear connectors 44, holes may be provided in the wide surfaces of first plurality 42 and second flange 43, and frame-shaped protrusions may be provided around the holes to form shear connectors.

[0067] [Construction method of a building according to the embodiment] Next, an example of a construction method for a building according to the embodiment will be described with reference to Figures 9, 10, and 3. Here, Figures 9 and 10 are diagrams illustrating steps A and B, respectively, of an example of a construction method for a building according to the embodiment. As already mentioned, Figure 3 is a longitudinal cross-sectional view showing an example of a building according to the embodiment, and is also a diagram illustrating step C of an example of a construction method for a building according to the embodiment. Here, the following description will explain a construction method that applies a core material 40 to which multiple shear connectors 60 are attached below, but a core material 40 to which the other shear connectors 60A, 60B, 60C, etc. described above are attached may also be applied, or a core material 40 whose part forms a shear connector 44 as shown in Figure 8 may also be applied.

[0068] In the construction method for a building, first, as shown in FIG. 9, prior to the construction of the building, a soil cement column-type continuous wall 20 having a rectangular frame shape in plan view is constructed as an earth retaining wall around the periphery of the construction area of the building.

[0069] The construction method for the soil cement columnar continuous wall 20 can be the well-known SMW (Soil Mixing Wall) method, etc., and begins with the removal of underground obstacles, followed by the installation of a guide wall (not shown), mixing the soil cement, and then discharging the designed mix of cement slurry from the tip of the auger head of a multi-shaft auger machine or the like while drilling and mixing the slurry.After reaching the specified depth, the auger head is pulled up while repeatedly mixing the slurry, thereby creating soil cement 30 in the drilled hole G1.

[0070] Then, before the soil cement 30 hardens, the core material 40 is inserted into the soil cement 30 in the X1 direction and erected. The wall construction procedure can be a continuous method in which a first element is constructed, then a second element is constructed at a distance, and then the holes at both ends of the third element are overlapped with the holes at one end of both the first and second elements, or a combined pre-drilling method in which multiple holes are pre-drilled at intervals in positions where the holes of each element will follow, and then each element is constructed so that the holes of each element overlap the holes drilled pre-drilled.

[0071] When the core material 40 is erected, a plurality of shear connectors 60 are welded to the lower part of the core material 40 .

[0072] The multiple shear connectors 60 joined below the core material 40 are equipped with cylindrical frame-shaped protrusions 68 that are circular when viewed from the front, which makes it easier for the soil cement to flow sideways along the sides of the frame-shaped protrusions 68, thereby enabling smooth insertion of the core material 40 into the soil cement 30 and improving the ease of fitting the core material 40 into the soil cement 30, thereby improving fitting accuracy (this is the end of Process A).

[0073] Next, as shown in FIG. 10, the upper region 30a of the soil cement diaphragm wall 20 on the building side is cut away to expose a part of the first flange 42.

[0074] Next, a shear connector 50 made up of a plurality of stud dowels is welded to the exposed first flange 42 (this is step B).

[0075] Next, as shown in Figure 3, the side walls 15 and base 17 of the underground portion 11 of the building 10 that abut at least the first flange 42 are constructed, and multiple stud dowels 50 are embedded in the side walls 15 and base 17, thereby joining the side walls 15 and base 17 of the underground portion 11 to the soil cement column-type continuous wall 20.

[0076] Thereafter, the entire building 10 is constructed, whereby the building 200 in which the building 10 and the soil cement diaphragm wall 20 are joined together is constructed (this is the end of step C).

[0077] According to the construction method of the illustrated example, by applying a core material 40 to which a shear connector 60 having a perforated steel plate 61 and a frame-shaped protrusion 68 provided around a hole 65 on its wide surface 62 is joined below the core material 40, in addition to the shear resistance caused by the soil cement 30 penetrating through the holes 65 of the perforated steel plate 61, the frame-shaped protrusion 68 exerts bearing resistance, making it possible to construct a building 200 having high strength against both the indentation load N1 and the pull-out load N2 acting from the building.

[0078] The present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0079] 10: Building 11: Underground 15: Side wall 16: Pillar 17: Bottom board 20: Soil cement diaphragm wall 30: Soil cement 30a: Upper area 40: Core material (H-beam) 41:Web 41a: Wide surface 42: First flange 42a:Inner surface 43: Second flange 43a: Inner surface 44: Shear connector 46: Hole 48:Frame-like projection 50: Shear connector (stud dowel) 60, 60A, 60B, 60C: Shear connector 61: Perforated steel plate 62: Wide surface 63: End face (end) 65,65A,65B: Hole 68,68A,68B:Frame-like projection 200: Buildings G: Ground G1: Drilling N1: Indentation load N2: Pull-out load S: Shear resistance P: Bearing resistance force

Claims

1. A building in which at least a side wall of an underground portion of a building located in the ground is joined to a soil cement continuous column wall provided around the building, and the soil cement continuous column wall has a steel core material buried inside the soil cement, A building comprising a shear connector having a perforated steel plate and a frame-shaped protrusion provided around the hole on the wide surface of the perforated steel plate, the end of the perforated steel plate being joined to at least the lower part of the core material.

2. 2. The building according to claim 1, wherein the frame-shaped protrusions are provided around the holes on each of the two wide surfaces of the perforated steel plate.

3. The core material is formed of an H-shaped steel, 3. The building according to claim 1, wherein the shear connector is connected to one or both of the two wide faces of the web of the H-shaped steel.

4. The core material is formed of an H-shaped steel, 3. The building according to claim 1, wherein the shear connector is joined to the inner wide surface of the flange of the H-shaped steel.

5. A building in which at least a side wall of an underground portion of a building located in the ground is joined to a soil cement continuous column wall provided around the building, and the soil cement continuous column wall has a steel core material buried inside the soil cement, A building characterized in that a hole is provided at least below the core material, and a frame-shaped protrusion is provided around the hole on the wide surface of the core material to form a shear connector.

6. 6. The building according to claim 5, wherein the frame-shaped protrusions are provided around the holes on the two wide surfaces of the core material.

7. The shape of the hole in a front view is a circle, an ellipse that is long in the vertical direction, or a polygon having at least a corner portion on the lower side, 6. The building according to claim 1, wherein the shape of the frame-shaped protrusion is a shape that conforms to the shape of the hole in a front view.

8. A construction method for a building in which at least a side wall of an underground portion of a building located in the ground is joined to a soil cement diaphragm wall provided around the building, Step A is to construct a soil cement column-type continuous wall by erecting a core member formed of an H-shaped steel beam having a first flange on the building side, a second flange on the opposite side of the building, and a web inside the soil cement in the drilled hole; Step B: cutting the soil cement at the upper end of the soil cement diaphragm wall to expose a portion of the first flange, and joining a stud dowel to the exposed portion of the first flange; and a step C of constructing at least the side wall of the building that abuts against the first flange and embedding the stud dowel in the side wall to join the side wall of the underground portion and the soil cement columnar continuous wall to each other, a shear connector including a perforated steel plate and a frame-shaped protrusion provided around the hole on the wide surface of the perforated steel plate, and an end of the perforated steel plate is joined at least below the core material in step A.

9. A construction method for a building in which at least a side wall of an underground portion of a building located in the ground is joined to a soil cement diaphragm wall provided around the building, Step A is to construct a soil cement column-type continuous wall by erecting a core member formed of an H-shaped steel beam having a first flange on the building side, a second flange on the opposite side of the building, and a web inside the soil cement in the drilled hole; Step B: cutting the soil cement at the upper end of the soil cement diaphragm wall to expose a portion of the first flange, and joining a stud dowel to the exposed portion of the first flange; and a step C of constructing at least the side wall of the building that abuts against the first flange and embedding the stud dowel in the side wall to join the side wall of the underground portion and the soil cement columnar continuous wall to each other, A construction method for a building, characterized in that in step A, a hole is provided at least below the core material, and a frame-shaped protrusion is provided around the hole on the wide surface of the core material to form a shear connector.

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