Base member for pile foundation, pile foundation, and connection member for pile foundation

Abstract

To provide a base member for a pile foundation, and a pile foundation, which can be easily constructed.SOLUTION: A pile foundation base member 12 is connected to a pile 11 driven into the ground, and supports a structure installed on the ground. The pile foundation base member 12 includes a support part 21 on which the structure is placed, a leg part 22 that extends downward from the support part 21 and comes into contact with the ground, and a connecting part 23 that is fixed to the support part 21 or the leg part 22 and is connected to an above-ground protruding part 11A of the pile 11 in a state where at least a part of the above-ground protruding part 11A is disposed within a downward projection area R of an outer periphery of the support part 21.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a base member for a pile foundation, a pile foundation, and a connecting member for a pile foundation. [Background technology]

[0002] In recent years, with the spread of electric vehicles, the development of related infrastructure such as charging facilities is progressing. As an example of charging facilities, stand-type chargers (so-called charging stands) are often installed in commercial facilities, service areas, and the like. As shown in FIG. 14, for example, the charging stand includes a rectangular parallelepiped charger main body 101 installed on the ground G, and a charging connector 103 connected to the charger main body 101 via a cable 102. The charger main body 101 is fixed by anchor bolts or the like embedded in a foundation block 104 made of concrete. Electric wires 106 such as power lines and communication lines are drawn into the charging stand 100 via electric conduits 105 buried in the ground and the foundation block 104.

[0003] Incidentally, Patent Document 1 below discloses an example of a charging station. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2021-101611 A Summary of the Invention [Problem to be solved by the invention]

[0005] 14, it is necessary to manufacture concrete foundation blocks 104 in advance at a factory or the like, transport the foundation blocks 104 to a construction site, and bury them in the ground. Because the foundation blocks 104 are large and heavy, transporting and burying them in the ground requires a great deal of effort. It is possible to cast the foundation blocks 104 at the construction site, but this would require a curing period and would take a long time to complete construction, and would also increase costs.

[0006] An object of the present invention is to provide a base member for a pile foundation and a pile foundation that can be easily constructed. [Means for solving the problem]

[0007] (1) The present invention provides a base member for a pile foundation that is connected to a pile driven into the ground and supports a structure installed on the ground, A support portion on which the structure is placed; A leg portion extending downward from the support portion and contacting the ground; and a connecting portion that is fixed to the support portion or the leg portion and is connected to the above-ground protrusion of the pile with at least a portion of the above-ground protrusion of the pile positioned within a downward projection area of ​​the outer periphery of the support portion.

[0008] (2) In the base member for pile foundations according to (1) above, The connecting portion is connected to the above-ground protrusion with the entire above-ground protrusion being disposed within the downward projection area.

[0009] (3) In the base member for pile foundation according to (1) or (2) above, The leg portion extends downward from the entire outer periphery of the support portion, The connector is disposed within the leg.

[0010] (4) In any one of the pile foundation base members (1) to (3) above, The support portion has an opening formed therein that passes through in the vertical direction and exposes the above-ground protruding portion upward.

[0011] (5) Any one of the pile foundation base members (1) to (4) above, a first divided body including a part of the support portion, a part of the leg portion, and the connecting portion; The second divided body includes another part of the support portion and another part of the leg portion and is connected to the first divided body.

[0012] (6) In any one of the pile foundation base members (1) to (5) above, The connecting portion includes a cylindrical first cylindrical portion into which the ground protrusion is inserted, two cylindrical second cylindrical portions arranged adjacent to each other in the axial direction of the first cylindrical portion on either side of the first cylindrical portion and into which the ground protrusion is inserted, a connecting body that connects the two second cylindrical portions on the radial outside of the first cylindrical portion, and an operating member that is attached to the connecting body and moves the first cylindrical portion radially relative to the second cylindrical portions.

[0013] (7) In the base member for pile foundation according to (6) above, A first protrusion protruding radially inward is formed on an inner circumferential surface of the first cylindrical portion, A second protrusion protruding radially inward is formed on an inner circumferential surface of the second cylindrical portion, The first protrusion and the second protrusion are disposed at positions opposed to each other in a direction in which the operating member moves the first cylindrical portion, and approach each other as the first cylindrical portion moves.

[0014] (8) The pile foundation of the present invention comprises a base member according to any one of (1) to (6) above, and a pile connected to the connecting portion of the base member.

[0015] (9) The present invention provides a connecting member to be connected to a rod-shaped member, The rod-shaped member is inserted into a first cylindrical portion, two second cylindrical portions are arranged adjacent to each other in the axial direction of the first cylindrical portion on either side of the first cylindrical portion, and the member is inserted into the first cylindrical portion, a connecting body that connects the two second cylindrical portions on the radial outside of the first cylindrical portion, and an operating member that is attached to the connecting body and moves the first cylindrical portion radially relative to the second cylindrical portions. Effect of the Invention

[0016] The pile foundation base member and pile foundation of the present invention can be easily constructed. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a front view showing a state in which a structure is fixed to the pile foundation according to the first embodiment. [Diagram 2] FIG. [Diagram 3] FIG. 2 is a front view of the pile foundation showing a portion of the base member in cross section. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6A] 1A is a cross-sectional view of the connecting portion, FIG. 1B is a view taken along the line AA in FIG. 1A, and FIG. 1C is a view taken along the line B in FIG. [Figure 6B] FIG. 6B is a cross-sectional view taken along line DD of FIG. 6A. [Figure 7] FIG. 1A is a front view of a pile foundation according to a modified example, and FIG. 1B is a side view of the pile foundation according to the modified example. [Figure 8] FIG. 11 is a side view showing the pile foundation according to the second embodiment. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. 2 is a plan view of a portion of the pile foundation. [Figure 12] 12 is a cross-sectional view taken along line CC in FIG. 11. [Figure 13] FIG. 11 is a plan view of a pile foundation according to a modified example. [Figure 14] FIG. 1 is a front view showing a state in which a structure is fixed to a foundation according to the prior art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] [First embodiment] FIG. 1 is a front view showing a state in which a structure is fixed to a pile foundation according to the first embodiment. The pile foundation 10 of this embodiment supports a structure 100 installed on the ground. The structure 100 of this embodiment is a stand-type charger (charging stand). The charging stand 100 is used to charge the battery of an electric vehicle. The charging stand 100 is installed in various commercial facilities such as hotels, convenience stores, and shopping malls, and in service areas on highways. The charging stand 100 has a charger main body 101, a cable 102, and a charging connector 103. The charger main body 101 has a substantially rectangular parallelepiped casing 101A. The charging stand 100 has a lower end fixed to the ground G via the pile foundation 10. Electric wires 106, such as power lines and communication lines, are drawn into the charging stand 100 via electric conduits 105 buried in the ground.

[0019] The pile foundation 10 has a pile 11 and a base member 12. The pile 11 is a rod-shaped part that is embedded in the ground G. The pile 11 in this embodiment is a cylindrical pipe. The pile 11 in this embodiment is made of metal. Most of the pile 11 is embedded in the ground, and the upper end protrudes above ground. In the following description, this part protruding above ground is also referred to as the "above ground protruding part 11A." The pile foundation 10 in this embodiment includes two piles 11. Both of the two piles 11 are arranged in the vertical direction. The two piles 11 are parallel to each other.

[0020] Fig. 2 is a perspective view of the pile foundation, Fig. 3 is a front view of the pile foundation showing a part of a base member in cross section, Fig. 4 is a plan view of the pile foundation, and Fig. 5 is a bottom view of the pile foundation. The base member 12 is a component that directly supports the structure 100 that is installed on the ground. The base member 12 is placed on the ground G. Therefore, unlike the piles 11, the base member 12 is not embedded in the ground G. The ground G may be paved with asphalt mixture or concrete, or may be soil or gravel. The base member 12 supports the structure 100 from below. The upper surface of the base member 12 is used as a support surface for placing the structure 100.

[0021] The base member 12 is formed in a substantially trapezoidal shape when viewed from the side, and in a substantially rectangular or square shape when viewed from above. The base member 12 is made of metal or synthetic resin. The base member 12 is formed by, for example, casting. The base member 12 is hollow.

[0022] The base member 12 includes a support portion 21, legs 22, and a connecting portion 23. The support portion 21 is disposed at the upper end of the base member 12. The support portion 21 is a plate member disposed substantially horizontally. The support portion 21 is formed in a rectangular or square shape when viewed from above. The area of ​​the upper surface (mounting surface) 21A of the support portion 21 is slightly larger than the area of ​​the bottom plate of the casing 101A of the structure 100. An opening 21B is formed in the center of the support portion 21. The opening 21B penetrates the support portion 21 in the up-down direction.

[0023] The support portion 21 has a mounting hole 21C formed therein. Fasteners 25a, 25b (see FIG. 3) for fixing the structure 100 to the support portion 21 are attached to the mounting hole 21C. The fasteners in this embodiment are bolts 25a and nuts 25b. The mounting holes 21C are formed in a plurality of locations (for example, four locations). The bolts 25a as the fasteners 25 are inserted from below into the mounting holes 21C, and are also inserted into mounting holes formed in the bottom plate 101B of the casing 101A of the structure 100. The nuts 25b are fastened to the upper ends of the bolts 25a. This fixes the structure 100 to the support portion 21. The bolts 25a may be embedded in the support portion 21.

[0024] The leg portion 22 is connected to the support portion 21. In this embodiment, the leg portion 22 and the support portion 21 are integrally formed. The leg portion 22 extends downward from the support portion 21. Specifically, the leg portion 22 extends downward from the entire circumference (four sides: front, back, left and right) of the outer periphery of the support portion 21. Therefore, the leg portion 22 is formed in a cylindrical shape, more specifically, a square cylindrical shape. The lower end of the cylindrical leg portion 22 is open downward. The opening area of ​​the lower end of the leg portion 22 is larger than the area of ​​the upper surface 21A of the support portion 21. The outer periphery of the leg portion 22 is inclined so that the horizontal cross-sectional area inside the cylinder increases toward the bottom.

[0025] The leg portion 22 has a pair of first walls 22A arranged opposite to each other and a pair of second walls 22B arranged opposite to each other. The first walls 22A extend downward from the short side of the rectangular support portion 21. The second walls 22B extend downward from the long side of the rectangular support portion 21. The distance between the pair of first walls 22A is larger at the lower end than at the upper end. The distance between the pair of second walls 22B is larger at the lower end than at the upper end. However, the pair of first walls 22A may be parallel to each other, and the pair of second walls 22B may be parallel to each other.

[0026] FIG. 6A(a) is a cross-sectional view of the connecting portion, (b) is a view taken along the line AA in (a), and (c) is a view taken along the line B in (b). FIG. 6B is a cross-sectional view taken along the line DD in FIG. 6A. The connecting portion 23 is connected to the aboveground protruding portion 11A of the pile 11. The connecting portion 23 is disposed inside the leg portion 22. The connecting portion 23 is disposed below the support portion 21. Therefore, the aboveground protruding portion 11A of the pile 11 connected to the connecting portion 23 is disposed inside the leg portion 22 and within a downward projection area R of the outer periphery of the support portion 21 (an area included inside both the width W1 and width W2 of the support portion 21 in a top view in FIG. 4; an area surrounded by the outer periphery of the support portion 21 in a top view). The base member 12 of this embodiment has two connecting portions 23 that are connected to the aboveground protruding portions 11A of the two piles 11.

[0027] Each of the connecting portions 23 includes a first member 31 and a second member 32. The first member 31 is fixed to the leg portion 22. In this embodiment, the first member 31 is formed integrally with the first wall 22A of the leg portion 22. The first member 31 of the support portion 21 has a first cylindrical portion 31A formed in a cylindrical shape. The first cylindrical portion 31A has an axis in the vertical direction.

[0028] The second member 32 is configured as a separate body from the support portion 21, the leg portion 22, and the first member 31. The second member 32 has a second cylindrical portion 32A and a connecting body 32B. The second member 32 has two second cylindrical portions 32A formed in a cylindrical shape. The two second cylindrical portions 32A are arranged above and below the first cylindrical portion 31A, and sandwich the first cylindrical portion 31A from above and below. The second cylindrical portion 32A has an axis in the vertical direction. The inner diameter of the second cylindrical portion 32A is approximately the same as the inner diameter of the first cylindrical portion 31A.

[0029] The connector 32B connects the upper and lower second tube portions 32A. In this embodiment, the connector 32B is formed integrally with the upper and lower second tube portions 32A. The connector 32B is disposed on the opposite side of the first member 31 from the first wall 22A of the leg portion 22 to which the first member 31 (first tube portion 31A) is connected. The connector 32B has a through hole 32B1 and a recess 32B2. The recess 32B2 is formed in the middle of the through hole 32B1, and the nut 32C is inserted in a state of being prevented from rotating. The screw hole of the nut 32C and the through hole 32B1 are disposed concentrically. An operating member (pressing member) exemplified by a bolt 33 is inserted into the through hole 32B1, and the bolt 33 is fastened to the nut 32C. The bolt 33 is inserted into the through hole 32B1 from the opposite side of the first tube portion 31A across the connector 32B. The tip of the bolt 33 protrudes from the through hole 32B1 and contacts the outer circumferential surface of the first tubular portion 31A. Therefore, when the bolt 33 is fastened to the nut 32C, it presses the outer circumferential surface of the first tubular portion 31A and moves it in the radial direction. When the bolt 33 presses the first tubular portion 31A, the axis of the first tubular portion 31A and the axis of the second tubular portion 32A are misaligned, and the radial distance between them increases. It is also possible to form a thread groove into which the bolt 33 is fastened in the through hole 32B1 instead of the nut 32C.

[0030] A first protrusion 31A1 is formed on the inner peripheral surface of the first cylindrical portion 31A. A second protrusion 32A1 is formed on the inner peripheral surface of the second cylindrical portion 32A. The first protrusion 31A1 is formed in the same phase as the portion that contacts the bolt 33 in the circumferential direction of the first cylindrical portion 31A. The second protrusion 32A1 is disposed at a position that is 180° out of phase with the first protrusion 31A1 in the circumferential direction of the first and second cylindrical portions 31A, 32A. The first protrusion 31A1 and the second protrusion 32A1 are formed so that their circumferential length is greater than their vertical width.

[0031] As shown in FIG. 6A(b), the second tubular portion 32A has an inner peripheral surface of a substantially elliptical shape in which the length L1 in the left-right direction in the figure is slightly longer than the length L2 in the up-down direction. The length L2 is slightly larger than the diameter of the pile 11. The distance L3 from the tip of the second projection 32A1 to the inner peripheral surface of the second tubular portion 32A facing it is also slightly larger than the diameter of the pile 11. Therefore, even if the second projection 32A1 is provided, the pile 11 can be inserted into the second tubular portion 32A. Although not shown, the inner peripheral surface of the first tubular portion 31A is also formed in a similar shape.

[0032] An abutment portion 31A2 protrudes from the outer peripheral surface of the first cylindrical portion 31A. This abutment portion 31A2 is formed across the width of the first cylindrical portion 31A in the vertical direction. The abutment portion 31A2 is formed in the same phase as the first protrusion 31A1 in the circumferential direction. The tip of the bolt 33 abuts against the tip surface of the abutment portion 31A2. In the connecting body 32B, a guide groove 32B3 that is long in the vertical direction is formed on the surface facing the first cylindrical portion 31A. The abutment portion 31A2 of the first cylindrical portion 31A is inserted into the guide groove 32B3. As a result, the first cylindrical portion 31A and the second cylindrical portion 32A are positioned in the circumferential direction, and the first protrusion 31A1 and the second protrusion 32A1 are appropriately positioned in opposing positions with a phase shift of 180 degrees. Therefore, the contact portion (projection portion) 31A2 and the guide groove 32B3 constitute a positioning means for positioning the first cylindrical portion 31A and the second cylindrical portion 32A in the circumferential direction.

[0033] The above-ground protruding portion 11A of the pile 11 is inserted into the first tubular portion 31A and the second tubular portion 32A of the connecting portion 23. When the bolt 33 is fastened to the nut 32C provided on the connecting body 32B of the second member 32, the tip of the bolt 33 presses the first tubular portion 31A in the radial direction, and the axis of the first tubular portion 31A and the axis of the second tubular portion 32A are displaced in the radial direction, and the distance between them increases. Therefore, the inner peripheral surface of the first tubular portion 31A and the inner peripheral surface of the second tubular portion 32A strongly contact the outer peripheral surface of the above-ground protruding portion 11A. In particular, the first protrusion 31A1 of the first tubular portion 31A and the second protrusion 32A1 of the second tubular portion 32A strongly contact the outer peripheral surface of the above-ground protruding portion 11A and bite into the outer peripheral surface, thereby deforming the above-ground protruding portion 11A. As a result, the ground protruding portion 11A inserted into the first and second tubular portions 31A, 32A is prevented from coming off, and the connecting portion 23 is firmly connected to the ground protruding portion 11A.

[0034] The first and second cylindrical portions 31A and 32A may not be cylindrically completely closed in the circumferential direction, and may be cylindrical with a part open (missing) in the circumferential direction. In other words, the first and second cylindrical portions 31A and 32A may have an arc-shaped surface surrounding at least a part of the outer circumferential surface of the pile 11. For example, the first and second cylindrical portions 31A and 32A may have inner circumferential surfaces in a range (for example, a range of 180°) that includes the first projection 31A1 and the second projection 32A1, respectively, and face each other.

[0035] As shown in FIG. 4, the opening 21B formed in the support portion 21 of the base member 12 allows the inside of the base member 12 (the space surrounded by the support portion 21 and the leg portion 22) to be viewed from above. The first tubular portion 31A, the second tubular portion 32A, the connector 32B, and the bolt 33 of the connecting portion 23 are exposed to the outside through the opening 21B. In particular, the inner circumferential surfaces of the first tubular portion 31A and the second tubular portion 32A are completely exposed to the outside through the opening 21B when viewed from the axial direction (vertical direction). Therefore, when constructing the pile foundation 10 of this embodiment, the work of inserting the pile 11 into the inner circumferential surfaces of the first and second tubular portions 32A can be performed through the opening 21B. In addition, the work of fastening the bolt 33 of the connecting portion 23 to the nut 32C can be performed from above the base member 12 through the opening 21B.

[0036] (Pile foundation construction method 10) The pile foundation 10 of this embodiment can be constructed in the following procedure. First, the base member 12 is placed on the ground G. In this state, the pile 11 is inserted into the tubular parts 31A, 32A of the connecting part 23, and the pile 11 is driven into the ground G. A handy type electric tool can be used to drive the pile 11. After the pile 11 is driven to a predetermined depth, the bolt 33 is fastened to the nut 32C of the connecting part 23 with a predetermined tightening torque, and the tubular parts 31A, 32A are fixed to the pile 11. The construction of the pile foundation 10 is completed as described above. Therefore, in this embodiment, it is not necessary to transport the large and heavy foundation block 104 or to excavate the ground G widely to embed the foundation block 104, as in the conventional technology (see FIG. 14, for example), and the pile foundation 10 can be constructed extremely easily.

[0037] When the ground G is a paved surface, for example, holes with the minimum dimensions required for driving the piles 11 (for example, φ100 mm) are formed in the paved surface, and the piles 11 are driven into the holes. This makes it unnecessary to excavate a wide area of ​​the paved surface or to repave it, and construction can be easily performed. When the ground is weak, the pile foundation 10 can be constructed firmly by extending the piles 11, thereby increasing the bearing capacity of the structure 100.

[0038] The connecting portion 23 of the base member 12 is firmly connected to the pile 11 by the projections 31A1, 32A1 of the tubular portions 31A, 32A biting into the outer circumferential surface of the pile 11. Therefore, even if each pile 11 is driven vertically, it will not easily come out upward.

[0039] The pile foundation 10 constructed as described above can be removed by loosening the bolts 33, removing the base member 12 from the pile 11, and pulling the pile 11 out of the ground G. Therefore, it can be removed much more easily than the conventional foundation block 104.

[0040] In addition, as a construction method for the pile foundation 10, a procedure can be adopted in which after driving the pile 11 into the ground, the base member 12 is placed on the ground while inserting the above-ground protruding portion 11A into the first and second tubular portions 31A, 32A, and the connecting portion 23 is connected to the above-ground protruding portion 11A.

[0041] (Modification of the connecting portion 23) FIG. 7(a) is a front view of the pile foundation according to the modified example, and (b) is a side view of the pile foundation according to the modified example. In these modified examples, the piles 11 are inclined with respect to the vertical direction. Therefore, the axes of the tubular portions 31A and 32A in the connecting portion 23 of the base member 12 are also inclined with respect to the vertical direction. In the modified example shown in Fig. 7(a), the two piles 11 are inclined in opposite directions with respect to the direction in which the two piles 11 are lined up (left-right direction). Specifically, the distance between the upper ends of the two piles 11 is narrow and the distance between the lower ends is wide.

[0042] In the modification shown in Fig. 7(b), the two piles 11 are inclined in opposite directions relative to the vertical direction in the direction perpendicular to the direction in which the two piles 11 are lined up (front-to-back direction). According to each of the above modifications, the two piles 11 act as a retainer for each other to prevent the piles 11 from slipping out of the ground G, thereby increasing the bearing capacity of the structure 100 as the pile foundation 10. Also, according to each of the above modifications, the two piles 11 act as a retainer for each other to prevent the connecting portion 23 from slipping out upward.

[0043] [Second embodiment] Fig. 8 is a side view showing the pile foundation according to the second embodiment, Fig. 9 is a perspective view of the pile foundation, and Fig. 10 is a plan view of the pile foundation. The pile foundation 10 of this embodiment is similar to the pile foundation 10 of the first embodiment in that it includes a pile 11 and a base member 12. However, in this embodiment, the structure of the base member 12 is different from that of the first embodiment.

[0044] The pile foundation 10 of this embodiment has a structure capable of supporting a larger structure than that of the first embodiment. The base member 12 of this embodiment is formed in a rectangular or square shape when viewed from above. The base member 12 has a support portion 21, legs 22, and a plurality of connecting portions 23. When viewed from above, an opening 21B is formed in the center of the support portion 21, penetrating vertically. The support portion 21 and the legs 22 of this embodiment are each divided into a plurality of members.

[0045] The base member 12 has a plurality of corner members (first divided bodies) 41 and a plurality of frame members (second divided bodies) 42. Each corner member 41 has a part of the support portion 21 (first divided support portion 51A), a part of the leg portion 22 (first divided leg portion 52A), and one connecting portion 23. The frame member 42 has another part of the support portion 21 (second divided support portion 51B) and another part of the leg portion 22 (second divided leg portion 52B). The corner members 41 are disposed at the corners of the base member 12 in a top view. The frame members 42 are disposed at the sides of the base member 12 in a plan view.

[0046] FIG. 11 is a plan view of a part of the pile foundation. FIG. 12 is a cross-sectional view of line CC in FIG. 11. The first divided support portion 51A of the corner member 41 is a plate material formed in a substantially rectangular shape when viewed from above. The first divided leg portion 52A of the corner member 41 extends downward from the outer periphery of the first divided support portion 51A. The connecting portion 23 has a first member 31 and a second member 32 as in the first embodiment, and the first member 31 is connected to the first divided leg portion 52A. The specific configuration of the connecting portion 23 is substantially the same as in the first embodiment. However, the abutting portion 31A2 formed on the outer periphery of the first tubular portion 31A is smaller than the width of the first tubular portion 31A in the vertical direction, and is formed only in the range where the tip of the bolt 33 abuts. The corner member 41 is made of metal or synthetic resin as in the base member 12 of the first embodiment, and is manufactured by casting or the like.

[0047] As shown in Figs. 10 and 11, the second divided support portion 51B of the frame member 42 is a plate material formed in a substantially rectangular shape in a top view. As shown in Fig. 9, the second divided leg portion 52B of the frame member 42 has a portion 52B1 extending downward from the long side of the second divided support portion 51B located on the outer periphery of the base member 12, and a portion 52B2 bending from the lower end of the portion 52B1 toward the inside of the base member 12 by about 90°. Therefore, the frame member 42 of this embodiment has a U-shaped cross section. The frame member 42 of this embodiment uses "channel steel" standardized by JIS or the like. For example, in this embodiment, channel steel or lip channel steel is used. Instead of these, the frame member 42 may use shaped steel of other shapes such as angle steel, H-shaped steel, and I-shaped steel. The frame member 42 is not limited to shaped steel, and may be formed of plate material such as steel plate. The frame member 42 may be formed by joining a plurality of plate materials.

[0048] 11, a plate-shaped mounting piece 43 that protrudes toward the frame member 42 is formed integrally with the corner member 41. This mounting piece 43 is overlapped with a portion 52B1 of the second split leg portion 52B of the frame member 42, and is connected to the second split leg portion 52B with a fastener 44 formed of a bolt and a nut.

[0049] In this embodiment, the connecting portion 23 provided on each corner member 41 is disposed within a downward projection region R of the outer periphery of the support portion 21 in the base member 12 (a region included within both the widths W1 and W2 of the support portion 21 when viewed from above in FIG. 10; a region surrounded by the outer periphery of the support portion 21). Therefore, the above-ground protruding portion 11A of the pile 11 to which the connecting portion 23 is connected is also disposed within the downward projection region R of the outer periphery of the support portion 21.

[0050] The base member 12 of this embodiment further includes an installation member (third divided body) 45. The installation member 45 is bridged between two frame members 42 arranged opposite to each other. In this embodiment, the two installation members 45 are arranged parallel to each other. For the installation member 45 of this embodiment, "shaped steel" standardized by JIS or the like is used. For example, in this embodiment, a channel steel or a lip channel steel is used. Instead of these, shaped steel of other shapes such as an angle steel, an H-shaped steel, or an I-shaped steel may be used for the installation member 45. The installation member 45 is not limited to shaped steel, and may be formed of a plate material such as a steel plate. The installation member 45 may be formed by joining a plurality of plate materials.

[0051] The erection member 45 is fixed to the frame member 42 via a bracket 47. The bracket 47 is connected to the frame member 42 and the erection member 45 by fasteners 48 such as bolts. Each erection member 45 has a part (third divided support part) 51C of the support part 21. A mounting hole 21C is formed in the part 51C of the support part 21, into which a fastener such as a bolt for fixing the structure 100 is attached. The mounting hole 21C may also be formed in the part (second divided support part) 51B of the support part 21 in the frame member 42.

[0052] As shown in FIG. 10, the opening 21B formed in the support portion 21 of the base member 12 allows the inside of the base member 12 to be viewed from above. The first tubular portion 31A, the second tubular portion 32A, the connector 32B, and the bolt 33 of the connecting portion 23 are exposed to the outside through the opening 21B. In particular, the inner circumferential surfaces of the first tubular portion 31A and the second tubular portion 32A are completely exposed to the outside through the opening 21B when viewed from the axial direction (vertical direction). Therefore, when constructing the pile foundation 10 of this embodiment, the work of inserting the pile 11 into the inner circumferential surfaces of the first and second tubular portions 32A can be performed through the opening 21B. In addition, the work of fastening the bolt 33 of the connecting portion 23 to the nut 32C can also be performed from above the base member 12 through the opening 21B.

[0053] The base member 12 of this embodiment can change the size of the structure 100 that it can support by changing the length of the frame member 42. In particular, in this embodiment, a general channel steel is used as the frame member 42, so that the length of the frame member 42 can be easily changed according to the size of the structure 100.

[0054] [Modification of pile foundation] FIG. 13 is a plan view of a pile foundation according to a modified example. The pile foundation 10 according to this modification has a structure of the base member 12 that is slightly different from that of the first embodiment. In the base member 12 of this modification, one of the two connecting portions 23 is inclined toward one of the second walls 22B, and the other connecting portion 23 is inclined toward the other of the second walls 22B. Therefore, the bolt 33 of one connecting portion 23 and the bolt 33 of the other connecting portion 23 are not opposed to each other in a direction parallel to the second wall 22B, but are arranged with a positional deviation in a direction parallel to the first wall 22A. The other configurations are the same as those of the first embodiment shown in FIG. 4.

[0055] In the first embodiment, the bolts 33 in the two connecting parts 23 are arranged facing each other in a direction parallel to the second wall 22B, so it is difficult to secure a space between the two bolts 33 for operating each bolt 33. However, in this modified example, a relatively large operation space S can be easily secured for each bolt 33. Therefore, the operation of the bolt 33, that is, the operation of connecting the connecting part 23 to the pile 11, can be easily performed by using each operation space S. Note that, although two operation spaces S corresponding to each bolt 33 are individually shown in FIG. 13, when operating one bolt 33, not only can one operation space S corresponding to the bolt 33 be used, but both operation spaces S can be used.

[0056] [Other embodiments] The pile foundation 10 of the present invention can be used to install various structures on the ground, not limited to the charging station 100. Examples of the structures include substation equipment (cubicles), electric water heaters, outdoor storage sheds, animal sheds, and delivery boxes.

[0057] Although the pile foundation 10 in the above embodiment includes two or four piles 11, it may include three or five or more piles 11. The base member 12 may include connecting portions 23 according to the number of piles 11.

[0058] The base member 12 of the first embodiment and the corner member 41 of the second embodiment can be manufactured by various methods such as sheet metal processing, forging, injection molding, etc., without being limited to being formed by casting.

[0059] The specific configuration of the connecting part can be changed as appropriate. For example, the aboveground protruding part 11A of the pile 11 may be inserted into a single cylindrical part as the connecting part 23, and the aboveground protruding part 11A may be connected by a bolt penetrating the above cylindrical part 23. In the above embodiment, the bolt (operating member) 33 of the connecting part 23 may be fastened from the outside (outer surface) of the leg part 22. In this case, the fastening work of the bolt 33 can be easily performed from the outside of the base member 12. However, in this case, since the bolt 33 is exposed to the outer surface of the leg part 22, it is more preferable to configure it as in the first and second embodiments. In addition, the bolt 33 of the connecting part 23 may be configured to not only press the first cylindrical part 31A, but also to pull it by a thread. The connecting part 23 may be provided not only in the corner member 41, but also in the frame member 42 or the erection member 45. The connecting part 23 may be configured to be detachable from the corner member 41, the frame member 42, and the erection member 45.

[0060] In the above embodiment, the conduit 105 accommodating the electric wire 106 connected to the charging stand 100 is buried underground, but the electric wire exposed above ground may be drawn into the base member 12. In this case, for example, an opening or a notch for drawing the electric wire 105 may be formed in the leg 22 of the base member 12.

[0061] In the above embodiment, the entire above-ground protruding portion 11A of the pile 11 connected to the connecting portion 23 was positioned within the downward projection area R of the outer peripheral edge of the support portion 21 of the base member 12, but only a portion of it may be positioned in the downward projection area R.

[0062] [Effects of the embodiment of the present invention] (1) The pile foundation 10 in each of the above-mentioned embodiments has a base member 12. The base member 12 is connected to the pile 11 driven into the ground, and supports the structure 100 installed on the ground. The base member 12 includes a support portion 21 on which the structure 100 is placed, a leg portion 22 extending downward from the support portion 21 and contacting the ground, and a connecting portion 23 fixed to the support portion 21 or the leg portion 22 and connected to the above-ground protruding portion 11A of the pile 11 in a state in which at least a part of the above-ground protruding portion 11A of the pile 11 is disposed within a downward projection area R of the outer periphery of the support portion 21. With this configuration, the structure 100 can be installed without using a concrete foundation block 104 as in the conventional technology (see FIG. 14). The foundation block 104 of the conventional technology is large and heavy, so that it is difficult to carry it, and since it is necessary to excavate the ground widely to bury it in the ground, construction requires a lot of labor. In the case of this embodiment, construction is easy because it is only necessary to drive the pile 11 into the ground and connect the base member 12 to the above-ground protruding portion 11A of the pile 11. Furthermore, when the structure 100 is a charging station 100, people often pass around it, so if the pile 11 protrudes around the base member 12, there is a possibility that the pile 11 may get caught on a foot and become an obstacle to walking. In the pile foundation 10 of each of the above-mentioned embodiments, at least a part of the above-ground protruding portion 11A of the pile 11 is disposed within the downward projection area R of the outer periphery of the mounting surface. Therefore, it is possible to prevent the above-ground protruding portion 11A of the pile 11 from becoming an obstacle to walking.

[0063] (2) In the base member 12 in each of the above-described embodiments, the connecting portion 23 is connected to the above-ground protruding portion 11A of the pile 11 in a state in which the entire above-ground protruding portion 11A of the pile 11 is disposed within the downward projection area R of the outer circumferential edge of the support portion 21. Therefore, the pile 11 does not protrude around the base member 12, and the above-ground protruding portion 11A of the pile 11 can be further prevented from interfering with walking.

[0064] (3) In the base member 12 of each of the above-described embodiments, the legs 22 extend downward from the entire circumference of the outer periphery of the support portion 21, and the connecting portion 23 is disposed inside the legs. Therefore, the connecting portion 23 and the above-ground protruding portion 11A are surrounded and covered by the legs 22, which can further prevent the pile 11 from protruding out around the base member 12. In addition, since the connecting portion 23 and the above-ground protruding portion 11A are hidden by the legs 22 and are not exposed to the outside, the appearance can be improved.

[0065] (4) In the base member 12 of each of the above-described embodiments, the support portion 21 is formed with an opening 21B that penetrates in the vertical direction and exposes the above-ground protruding portion 11A of the pile 11 upward. Therefore, the connecting portion 23 can be connected to the above-ground protruding portion 11A through the opening 21B. In addition, the electric wire 106 can be easily drawn into the structure 100 through the opening 21B.

[0066] (5) The base member 12 of the second embodiment has a first divided body (corner member) 41 including a part of the support portion 21, a part of the leg portion 22, and the connecting portion 23, and a second divided body (frame member) 31 including a part of the support portion 21 and another part of the leg portion 22 and connected to the first divided body 41. As a result of the base member 12 having the first divided body 41 and the second divided body 42 in this way, it is possible to accommodate changes in the size of the structure 100 that can be supported by changing the size of some of the divided bodies.

[0067] (6) In the base member 12 of each of the above-mentioned embodiments, the connecting portion 23 includes a cylindrical first cylindrical portion 31A into which the above-ground protruding portion 11A of the pile 11 is inserted, two cylindrical second cylindrical portions 32A arranged adjacent to each other in the axial direction of the first cylindrical portion 31A across the first cylindrical portion 31A and into which the above-ground protruding portion 11A is inserted, a connecting body 32B that connects the two second cylindrical portions 32A on the radial outside of the first cylindrical portion 31A, and an operating member (bolt) 33 that is attached to the connecting body 32B and moves the first cylindrical portion 31A in the radial direction relative to the second cylindrical portion 32A. With this configuration, the inner circumferential surfaces of the first cylindrical portion 31A and the second cylindrical portion 32A can be pressed against the above-ground protruding portion 11A of the pile 11 inserted therein to be fixed.

[0068] (7) In the base member 12 of each of the above embodiments, the first cylindrical portion 31A has an inner peripheral surface formed with a first protrusion 31A1 protruding radially inward, and the second cylindrical portion 32A has an inner peripheral surface formed with a second protrusion 32A1 protruding radially inward. The first protrusion 31A1 and the second protrusion 32A1 face each other in the direction in which the operating member 33 moves the first cylindrical portion 31A, and are disposed at positions where they approach each other as the first cylindrical portion 31A moves. With this configuration, the first protrusion 31A1 and the second protrusion 32A1 can be engaged with the ground protrusion 11A and firmly connected to the ground protrusion 11A.

[0069] (8) In the above embodiment, a connecting member (connecting portion) 23 connected to the pile 11 is disclosed. The connecting member 23 includes a cylindrical first tubular portion 31A into which the pile 11 is inserted, two cylindrical second tubular portions 32A arranged adjacent to each other in the axial direction of the first tubular portion 31A across the first tubular portion 31A and into which the pile 11 is inserted, a connecting body 32B connecting the two second tubular portions 32A on the radial outside of the first tubular portion 31A, and an operating member (bolt) 33 attached to the connecting body 32B and moving the first tubular portion 31A in the radial direction relative to the second tubular portion 32A. With this configuration, the inner circumferential surfaces of the first tubular portion 31A and the second tubular portion 32A can be pressed against the pile 11 inserted therein to fix it.

[0070] [others] In addition, at least a part of the above-mentioned embodiment and various modified examples may be arbitrarily combined with each other. In addition, the embodiment disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0071] 10: Pile foundation 11:Pile 11A: Ground protrusion 12: Base material 21: Support part 21B: Opening 22: Legs 23: Connection part (connection member) 31A: 1st cylinder part 32A: 2nd cylinder part 32B: Concatenated body 41: Corner member (first division) 42: Frame member (second division body) 100: Charging station (structure) G: Ground R: Downward projection area

Claims

1. A base member for a pile foundation that is connected to a pile driven into the ground and supports a structure installed on the ground, A support on which the structure is placed; A leg portion extending downward from the support portion and contacting the ground; A base member for a pile foundation comprising: a connecting portion fixed to the support portion or the leg portion and connected to the above-ground protrusion of the pile with at least a portion of the above-ground protrusion of the pile positioned within a downward projection area of ​​the outer circumferential edge of the support portion.

2. The pile foundation base member according to claim 1 , wherein the connecting portion is connected to the above-ground protrusion with the above-ground protrusion being entirely disposed within the downward projection area.

3. The leg portion extends downward from the entire circumference of the outer periphery of the support portion, The pile foundation base member according to claim 1 or 2, wherein the connecting portion is disposed inside the leg.

4. The pile foundation base member according to claim 1 or 2, wherein the support portion has an opening formed therein that penetrates in the vertical direction and exposes the above-ground protruding portion upward.

5. a first divided body including a part of the support portion, a part of the leg portion, and the connecting portion; The pile foundation base member according to claim 1 or 2, further comprising: a second partition body including another part of the support portion and another part of the leg portion and connected to the first partition body.

6. The base member for a pile foundation as described in claim 1 or 2, wherein the connecting portion includes a cylindrical first cylindrical portion into which the above-ground protrusion is inserted, two cylindrical second cylindrical portions arranged adjacent to the axial direction of the first cylindrical portion on either side of the first cylindrical portion and into which the above-ground protrusion is inserted, a connecting body that connects the two second cylindrical portions on the radial outside of the first cylindrical portion, and an operating member attached to the connecting body and that moves the first cylindrical portion radially relative to the second cylindrical portions.

7. A first protrusion protruding radially inward is formed on an inner circumferential surface of the first cylindrical portion, A second protrusion protruding radially inward is formed on an inner circumferential surface of the second cylindrical portion, The pile foundation base member of claim 6, wherein the first protrusion and the second protrusion are opposed to each other in the direction in which the operating member moves the first tubular portion, and are positioned so as to approach each other as the first tubular portion moves.

8. A base member according to claim 1 or 2; A pile foundation comprising: a pile connected to the connecting portion of the base member.

9. A pile foundation connecting member connected to a pile, A connecting member for a pile foundation comprising: a cylindrical first tubular portion into which the pile is inserted; two cylindrical second tubular portions arranged adjacent to the first tubular portion in the axial direction and into which the piles are inserted, the first tubular portion being sandwiched between two second tubular portions; a connecting body that connects the two second tubular portions on the radial outside of the first tubular portion; and an operating member that is attached to the connecting body and moves the first tubular portions radially relative to the second tubular portions.

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