Basic Construct

Abstract

To provide a foundation structure capable of being built in a short period.SOLUTION: A foundation structure 100 can be built in a relatively short time by placing a first underlayer precast material 11, a second underlayer precast material 12, a third underlayer precast material 13, a first upper layer precast material 21, a second upper layer precast material 22 and a third upper layer precast material 23 to a predetermined placement, subsequently inserting a predetermined reinforcing bar 30 through a through hole H communicating the upper layer precast material (21, 22, 23) and the underlayer precast material (11, 12, 13), subsequently pouring and filling a solidification material M into the through hole H and solidifying the solidification material M. In particular, by omitting a bottom slab concrete (leveled concrete) in the conventional technology, and by using the underlayer precast materials (11,12,13), the construction period can be reduced by the period for curing the concrete. Thus, the foundation structure 100 can be built in a shorter period.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a foundation structure constructed using precast members. [Background technology]

[0002] Conventionally, foundation structures supporting elevated transportation routes, station sheds, etc. have been constructed, for example, in the following manner. First, a trench is formed to install the foundation structure, and foundation piles are driven into the ground from the bottom of the trench. Next, a formwork is placed in the trench, reinforcing bars are placed inside the formwork, and concrete is poured into the formwork. The concrete is then cured and hardened to complete the foundation structure with the foundation piles. The excavated ground (trench) may then be backfilled with soil. Since such a construction method has the problem of lengthening the construction period, a technique has been proposed for constructing a foundation structure in a short period of time using precast members (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4047660 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of the technology of Patent Document 1, concrete material is poured onto the ground, cured, and hardened to form a base concrete slab, and precast members are then placed on top of the base concrete slab, so there was still room to shorten the construction period by the time it took to cure the base concrete.

[0005] An object of the present invention is to provide a foundation structure that can be constructed in a short period of time. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides: A foundation structure comprising a lower layer precast member installed on the ground and an upper layer precast member installed on the lower layer precast member, The lower layer precast member is a pair of first lower layer precast members each having a first flat plate portion and a first vertical plate portion erected from one end of the first flat plate portion, and each having a generally L-shape in front view; a pair of second lower layer precast members each having a second flat plate portion and a second vertical plate portion erected from both ends of the second flat plate portion, and each having a generally U-shape in front view; and a pair of third lower layer precast members each having a third flat plate portion and a third vertical plate portion erected from one end of the third flat plate portion, and each having a substantially L-shape in front view. The pair of first lower layer precast members constitute a first lower layer body that is installed so that the first flat plate portions are butted against each other to form a generally U-shaped structure in a front view, The pair of second lower-level precast members are installed so that one of the second vertical plate portions is butted against the other to form a roughly mountain-shaped front view, and the other second vertical plate portion is installed in a position along at least one of the front and back of the first lower-level body in an orientation that connects it to the first vertical plate portion of the first lower-level precast member, thereby forming a second lower-level body; The pair of third lower layer precast members constitute a third lower layer body that is installed in an arrangement sandwiching the first lower layer body and the second lower layer body in an orientation in which the third vertical plate portion is juxtaposed with the connected first vertical plate portion and the other second vertical plate portion, The upper layer precast member is a first upper layer precast member installed on the upper surface of the portion of the first lower layer body where the first flat plate portions of the pair of first lower layer precast members are butted against each other; a second upper layer precast member having a recess and a generally inverted U-shape in front view, the recess being fitted into and covering the portion of the second lower layer where one of the second vertical plate portions is butted against the other; a third upper layer precast member having a recess and a generally inverted U-shape in front view, the recess being fitted into and covering the portion where the third vertical plate portion is arranged next to the first vertical plate portion and the other second vertical plate portion; The first vertical plate portions of the pair of first lower layer precast members constituting the first lower layer body are provided with through holes along the direction in which the first vertical plate portions face each other, The second vertical plate portions of the pair of second lower layer precast members constituting the second lower layer body are provided with through holes along the direction in which the second vertical plate portions face each other, The third vertical plate portion of a pair of third lower layer precast members constituting the third lower layer body is provided with a through hole communicating with the through hole of the first vertical plate portion and a through hole communicating with the through hole of the second vertical plate portion, The first upper-story precast member has a through-hole provided at a position connected to the through-hole of the first vertical plate portion of the first lower-story precast member, The second upper-story precast member has a through-hole provided at a position connected to the through-hole of the second vertical plate portion of the second lower-story precast member, The third upper-story precast member has through holes at positions communicating with the through holes in the first vertical plate portion of the first lower-story precast member and the through holes in the third vertical plate portion of the third lower-story precast member, and at positions communicating with the through holes in the second vertical plate portion of the second lower-story precast member and the through holes in the third vertical plate portion of the third lower-story precast member, When the upper layer precast member is placed on the lower layer precast member, a predetermined reinforcing bar can be inserted into the through hole connecting the upper layer precast member and the lower layer precast member, The inner diameter of the through hole is set to be larger than the diameter of the predetermined reinforcing bar. Here, when the upper precast member is placed on the lower precast member, the inner diameter of the through hole connecting the upper and lower precast members is larger than the diameter of the specified reinforcing bar, so that a specified clearance is provided between the inner wall of the through hole and the specified reinforcing bar.Therefore, even if the reinforcing bar is slightly angled relative to the through hole due to, for example, level adjustment of the upper precast member, the reinforcing bar is less likely to come into contact with the inner wall of the through hole.

[0007] With a foundation structure of this configuration, by installing the upper precast members so that they fit onto the lower precast members, the lower precast members and the upper precast members are less likely to shift, and the lower precast members and the upper precast members can be easily integrated, so the foundation structure can be constructed in a relatively short period of time. Furthermore, for example, the inner diameter of the through hole connecting the upper precast member and the lower precast member is larger than the diameter of a specified reinforcing bar, and is configured so that the specified reinforcing bar can be inserted at an angle to the extension direction of the through hole.Therefore, even if there is a slight misalignment in the arrangement of the lower precast members (first lower precast member, second lower precast member, third lower precast member) and the upper precast members (first upper precast member, second upper precast member, third upper precast member), the specified reinforcing bar can be easily inserted into the through hole, and the foundation structure can be constructed in a relatively short period of time. Furthermore, for example, if the level of the first upper layer precast member on the lower layer precast member is adjusted using thin plate material, the level of the second upper layer precast member on the lower layer precast member is adjusted using thin plate material, or the level of the third upper layer precast member on the lower layer precast member is adjusted using thin plate material, even if the posture of the first upper layer precast member, the second upper layer precast member, or the third upper layer precast member changes to the extent of the level adjustment, the reinforcing bars will not come into contact with the first upper layer precast member (through holes), the second upper layer precast member (through holes), or the third upper layer precast member (through holes), and this will not hinder the level adjustment, so the desired level adjustment can be made and the foundation structure can be constructed appropriately.

[0008] In particular, by omitting the base slab concrete (leveling concrete) used in the prior art (Patent Document 1 above) and instead using first, second and third lower layer precast members, the construction period can be shortened by the time required for the concrete to cure, making it possible to construct the foundation structure in a shorter period of time.

[0009] Also, preferably, The two sets of second lower bodies are arranged to sandwich the first lower body in a direction in which the other second vertical plate portion is connected to the first vertical plate portion.

[0010] This makes it easier to expand the basic structure.

[0011] Also, preferably, A solidifying material is filled between the through hole and the predetermined reinforcing bar inserted into the through hole.

[0012] A stronger foundation structure can be constructed by filling the space between the through-hole and the specified reinforcing bars with a solidifying material and allowing it to solidify.

[0013] Also, preferably, The first upper layer precast member, the second upper layer precast member, and the third upper layer precast member are installed on the lower layer precast member with gaps between them, The gap is filled with a solidifying material.

[0014] If the first upper layer precast member, the second upper layer precast member, and the third upper layer precast member are arranged side by side with a gap between them, then, for example, the level of the first upper layer precast member on the lower layer precast member can be adjusted using thin plate material, the level of the second upper layer precast member on the lower layer precast member can be adjusted using thin plate material, or the level of the third upper layer precast member on the lower layer precast member can be adjusted using thin plate material.Even if the posture of the first upper layer precast member, the second upper layer precast member, or the third upper layer precast member changes to the extent of the level adjustment, the first upper layer precast member, the second upper layer precast member, and the third upper layer precast member will not come into contact with or interfere with each other, and the level adjustment will not be hindered, so the desired level adjustment can be made. Then, the gaps are filled with a solidifying material and solidified, thereby constructing a stronger foundation structure.

[0015] Also, preferably, Between the lower layer precast member and the first upper layer precast member; Between the lower layer precast member and the second upper layer precast member; A thin plate material for horizontal adjustment (level adjustment) can be inserted between the lower precast member and the third upper precast member, The gaps between the precast members formed by inserting the thin plate materials are filled with a solidifying material.

[0016] A foundation structure can be constructed by filling and solidifying solidifying material into gaps created by using thin plate material to adjust the level of a first upper-layer precast member on a lower-layer precast member, gaps created by using thin plate material to adjust the level of a second upper-layer precast member on a lower-layer precast member, and gaps created by using thin plate material to adjust the level of a third upper-layer precast member on a lower-layer precast member.

[0017] Also, preferably, The undersides of the first lower layer precast member, the second lower layer precast member and the third lower layer precast member are formed with friction resistance portions consisting of unevenness to increase friction resistance with the ground surface.

[0018] Friction resistance portions that increase friction resistance with the ground surface are formed on the undersides of the first, second and third lower layer precast members, so the first, second and third lower layer precast members installed on the ground are less likely to slip from the ground surface, and the first, second and third lower layer precast members can be installed in a stable position on the ground. The first, second and third lower layer precast members can then be made to function favorably as the base concrete (leveling concrete) of the prior art (Patent Document 1 above), for example. [Effects of the Invention]

[0019] According to the present invention, a foundation structure that can be constructed in a short period of time is obtained. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 2 is a perspective view showing a foundation structure according to the present embodiment. [Figure 2] 1A is a top view, FIG. 1B is a front view, and FIG. 1C is a side view showing the foundation structure of this embodiment. [Figure 3]1A is a top view, FIG. 1B is a front view, and FIG. 1C is a perspective view showing the first lower layer precast member that constitutes the foundation structure. [Figure 4] 1A is a top view, a front view, and a perspective view, respectively, of the second lower layer precast member that constitutes the foundation structure. [Figure 5] This is a top view (a), a front view (b), and a perspective view (c) showing the relatively long third lower layer precast member that makes up the foundation structure. [Figure 6] This is a top view (a), a front view (b), and a perspective view (c) showing the relatively short third lower layer precast member that makes up the foundation structure. [Figure 7] 1A, 1B, 1C, and 1D are a top view, a front view, a side view, and a perspective view, respectively, showing the first upper layer precast member that constitutes the foundation structure. [Figure 8] 1A is a top view, a front view, and a perspective view, respectively, of the second upper layer precast member that constitutes the foundation structure. [Figure 9] This is a top view (a), a front view (b), and a perspective view (c) showing the third upper layer precast member that constitutes the foundation structure. [Figure 10] 1A, 1B, and 1C are explanatory diagrams showing the procedure for constructing the foundation structure of this embodiment. [Figure 11] 1A and 1B are explanatory diagrams showing a procedure for constructing a foundation structure according to this embodiment. [Figure 12] 1A and 1B are explanatory diagrams showing a procedure for constructing a foundation structure according to this embodiment. [Figure 13] FIG. 10 is a perspective view showing a modified example of the foundation structure. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the foundation structure according to the present invention will be described in detail with reference to the drawings. However, although the embodiments described below are subject to various limitations that are technically preferable for carrying out the present invention, the scope of the present invention is not limited to the following embodiments and illustrated examples. In this embodiment, a foundation structure constructed using precast members will be described.

[0022] The foundation structure 100 of this embodiment comprises lower precast members 10 (11, 12, 13) placed on the ground G and upper precast members 20 (21, 22, 23) placed on the lower precast members 10, as shown in, for example, Figures 1, 2(a)(b)(c), and 10(c).

[0023] The lower layer precast member 10 has a first lower layer precast member 11, a second lower layer precast member 12, and a third lower layer precast member 13 (see FIG. 10(c)). The lower layer precast members 10 of this embodiment include a pair of first lower layer precast members 11, two pairs of second lower layer precast members 12, and a pair of third lower layer precast members 13.

[0024] 3(a), (b), and (c), the first lower layer precast member 11 has a first flat plate portion 11a and a first vertical plate portion 11b erected from one end of the first flat plate portion 11a, and is generally L-shaped when viewed from the front. Note that L-shaped reinforcing bars and reinforcing bars are arranged in the first lower layer precast member 11, but these are not shown in the drawings. In addition, the underside of the first lower layer precast member 11 is formed with a friction resistance portion 10a that is roughened to increase friction resistance with the ground surface.

[0025] As shown in Figure 10(a), a pair of first lower layer precast members 11 are arranged with their first flat plate portions 11a butted together to form a roughly U-shape when viewed from the front, thereby forming a first lower layer body 110. The first vertical plate portions 11b of the pair of first lower layer precast members 11 that make up this first lower layer body 110 are provided with through holes H that run along the direction in which the first vertical plate portions 11b face each other. In this embodiment, the first vertical plate portions 11b are provided with four through holes H. These through holes H are formed using sheath tubes.

[0026] 4(a), (b), and (c), the second lower layer precast member 12 has a second flat plate portion 12a and second vertical plate portions 12b erected from both ends of the second flat plate portion 12a, and is generally U-shaped when viewed from the front. Note that U-shaped steel bars and reinforcing bars are arranged in the second lower layer precast member 12, but these are not shown in the drawings. In addition, the lower surface of the second lower layer precast member 12 is formed with a friction resistance portion 10a that is roughened to increase friction resistance with the ground surface.

[0027] As shown in Figure 10(b), a pair of second lower layer precast members 12 are installed so that one of the second vertical plate portions 12b is butted against the other to form an approximately mountain-shaped configuration when viewed from the front, and the other second vertical plate portion 12b is oriented to connect to the first vertical plate portion 11b of the first lower layer precast member 11, and is installed alongside at least one of the front and back sides of the first lower layer body 110 to form a second lower layer body 120. In this embodiment, two sets of second lower bodies 120 are disposed so as to sandwich the first lower body 110 therebetween. The second vertical plate portions 12b of the pair of second lower layer precast members 12 constituting this second lower layer body 120 are provided with through holes H along the direction in which the second vertical plate portions 12b face each other. In this embodiment, two through holes H are provided in each second vertical plate portion 12b. These through holes H are formed using sheath tubes.

[0028] As shown in Figures 5(a)(b)(c) and 6(a)(b)(c), the third lower layer precast member 13 has a third flat plate portion 13a and a third vertical plate portion 13b erected from one end of the third flat plate portion 13a, and is generally L-shaped when viewed from the front. Note that L-shaped reinforcing bars and reinforcing bars are arranged in the third lower layer precast member 13, but these are not shown in the drawings. In this embodiment, in consideration of the workability in constructing the foundation structure 100, the third lower layer precast member 13 is divided into a relatively long third lower layer precast member 13 (see Figure 5) and a relatively short third lower layer precast member 13 (see Figure 6), which are connected together, but it is also possible to use a single third lower layer precast member having the length (size) of both members combined together. Additionally, the bottom surface of the third lower layer precast member 13 is formed with a friction resistance portion 10a that is roughened to increase friction resistance with the ground surface.

[0029] As shown in Figure 10(c), etc., a pair of third lower layer precast members 13 are arranged in a position sandwiching the first lower layer 110 and the second lower layer 120, with the third vertical plate portion 13b juxtaposed to the connected first vertical plate portion 11b and the other second vertical plate portion 12b, to form a third lower layer 130. The third vertical plate portions 13b of the pair of third lower layer precast members 13 constituting this third lower layer body 130 are provided with a through hole H that communicates with the through hole H of the first vertical plate portion 11b and a through hole H that communicates with the through hole H of the second vertical plate portion 12b. In this embodiment, four through holes H are provided in the third vertical plate portion 13b of the relatively long third lower layer precast member 13 (see Figure 5), and two through holes H are provided in the third vertical plate portion 13b of the relatively short third lower layer precast member 13 (see Figure 6). The through holes H are formed using sheath tubes.

[0030] The first flat plate portion 11a, the second flat plate portion 12a, and the third flat plate portion 13a of the lower layer precast member 10 are formed to have approximately the same thickness. Furthermore, the first vertical plate portion 11b, the second vertical plate portion 12b, and the third vertical plate portion 13b in the lower layer precast member 10 are formed to have approximately the same height.

[0031] The upper layer precast member 20 has a first upper layer precast member 21, a second upper layer precast member 22, and a third upper layer precast member 23 (see Figs. 1 and 12). The upper story precast members 20 of this embodiment include two first upper story precast members 21, two second upper story precast members 22, and four third upper story precast members 23.

[0032] As shown in Figures 7(a), (b), (c), and (d), the first upper layer precast member 21 has a substantially rectangular parallelepiped shape, and has foundation reinforcing bars 100a arranged to extend upward from its top surface. In the first upper layer precast member 21 of this embodiment, two foundation reinforcing bars 100a are arranged. Specifically, a substantially J-shaped foundation reinforcing bar 100a is arranged in the first upper story precast member 21 so that one end of the reinforcing bar extends upward from the top surface. Note that other reinforcing bars and ties are arranged in the first upper story precast member 21, but these are not shown in the drawings. For example, columns of a building constructed on the foundation structure 100 are connected to the foundation reinforcing bars 100a.

[0033] As shown in Figures 10 and 11, this first upper layer precast member 21 is installed on the upper surface of the portion of the first lower layer body 110 where the first flat plate portions 11a of a pair of first lower layer precast members 11 are butted together. The first upper-story precast member 21 has a through hole H at a position that connects to the through hole H of the first vertical plate portion 11b of the first lower-story precast member 11. In this embodiment, two through holes H are provided. This through hole H is formed using a sheath tube.

[0034] 8(a), (b), and (c), the second upper layer precast member 22 has a recess 22a and is generally inverted U-shaped when viewed from the front. Note that U-shaped reinforcing bars and reinforcing bars are arranged in the second upper layer precast member 22, but these are not shown in the drawings. As shown in Figures 11 and 12, this second upper layer precast member 22 is installed so that the recess 22a of this second upper layer precast member 22 fits into and covers the portion of the second lower layer 120 where one of the second vertical plate portions 12b is butted against the other. The second upper-story precast member 22 has through holes formed at positions that connect to the through holes H in the second vertical plate portion 12b of the second lower-story precast member 12. In this embodiment, two through holes H are formed on each side. These through holes H are formed using sheath tubes.

[0035] 9(a), (b), and (c), the third upper-story precast member 23 has a recess 23a and is generally inverted U-shaped when viewed from the front. Note that U-shaped reinforcing bars and reinforcing bars are arranged in the third upper-story precast member 23, but these are not shown in the drawings. As shown in Figures 10 and 11, this third upper layer precast member 23 is installed so that the recess 23a of the third upper layer precast member 23 fits into and covers the portion where the third vertical plate portion 13b is arranged next to the first vertical plate portion 11b and the other second vertical plate portion 12b. The third upper-story precast member 23 has through holes H at positions connecting with the through holes H of the first vertical plate portion 11b of the first lower-story precast member 11 and the through holes H of the third vertical plate portion 13b of the third lower-story precast member 13, and at positions connecting with the through holes H of the second vertical plate portion 12b of the second lower-story precast member 12 and the through holes H of the third vertical plate portion 13b of the third lower-story precast member 13. In this embodiment, four through holes H are provided on each side. These through holes H are formed using sheath tubes.

[0036] When the upper layer precast members 20 (21, 22, 23) are placed on the lower layer precast members 10 (11, 12, 13) (see Figure 12(a)), the through holes H of each precast member are connected and communicated at the points where each precast member is adjacent. A predetermined reinforcing bar 30 (see FIG. 12(a)) is inserted into the through-hole H that connects the upper-story precast member 10 and the lower-story precast member 20. The inner diameter of this through hole H is larger than the diameter of the predetermined reinforcing bar 30. In other words, there is a predetermined clearance between the through hole H and the predetermined reinforcing bar 30, and the predetermined reinforcing bar 30 can be inserted into the through hole H at an angle to the extending direction of the through hole H.

[0037] Next, the procedure for constructing the foundation structure 100 of this embodiment using the first lower layer precast member 11, the second lower layer precast member 12, the third lower layer precast member 13, the first upper layer precast member 21, the second upper layer precast member 22, and the third upper layer precast member 23 will be described.

[0038] First, as shown in FIG. 10(a), a first lower layer body 110 consisting of a pair of first lower layer precast members 11 is placed on the ground G. Specifically, the first flat plate portions 11a of a pair of first lower layer precast members 11 are butted together to form a generally U-shape in front view. This pair of first lower layer precast members 11 corresponds to the first lower layer body 110. At this time, the pair of first lower layer precast members 11 are installed with a gap between them. Note that it is sufficient to leave a gap of about 15 mm between each precast member.

[0039] Next, as shown in FIG. 10(b), a second lower layer body 120 consisting of a pair of second lower layer precast members 12 is placed on the ground G. Specifically, the second vertical plate portions 12b of one of a pair of second lower layer precast members 12 are butted together to form a roughly angled shape in front view, and the other second vertical plate portion 12b is oriented to connect to the first vertical plate portion 12b of the first lower layer precast member 11. This pair of second lower layer precast members 12 corresponds to the second lower body 120. In this embodiment, two sets of second lower bodies 120 are placed with the first lower body 110 sandwiched therebetween. At this time, the pair of second lower layer precast members 12 are installed with a gap between them. The second lower layer precast member 12 and the first lower layer precast member 11 are also installed with a gap between them. Note that it is sufficient to leave a gap of about 15 mm between each precast member.

[0040] Next, as shown in FIG. 10(c), a third lower layer body 130 consisting of a pair of third lower layer precast members 13 is placed on the ground G. Specifically, the third vertical plate portions 13b of the pair of third lower layer precast members 13 are oriented so as to be parallel to the connected first vertical plate portion 11b and the other second vertical plate portion 12b, and the pair of third lower layer precast members 13 are positioned to sandwich the first lower layer body 110 and the second lower layer body 120. This pair of third lower layer precast members 13 corresponds to the third lower layer body 130. At this time, the third lower layer precast member 13 is installed with a gap between it and the second lower layer precast member 12 and the first lower layer precast member 11. It is sufficient to leave a gap of about 15 mm between each precast member.

[0041] Here, friction resistance portions 10a are formed on the undersides of the first lower layer precast member 11, the second lower layer precast member 12, and the third lower layer precast member 13, so the first lower layer precast member 11, the second lower layer precast member 12, and the third lower layer precast member 13 installed on the ground G are less likely to slip from the ground surface G, and the first lower layer precast member 11, the second lower layer precast member 12, and the third lower layer precast member 13 can be installed in a stable position on the ground G. It is assumed that the ground G has been leveled in advance and that there are no extreme unevenness in the ground surface G. Furthermore, as will be described later, in the foundation structure 100 of this embodiment, the posture of the upper precast members (21, 22, 23) placed on the lower precast members (11, 12, 13) is adjusted to make them horizontal and vertical, etc., so the horizontal accuracy does not need to be strict when placing the lower precast members (11, 12, 13) on the ground G.

[0042] Next, as shown in FIG. 11( a ), the third upper layer precast member 23 is placed on the lower layer precast member 10 . Specifically, the recess 23a of the third upper layer precast member 23 is installed so that it fits over the portion where the third vertical plate portion 13b is arranged next to the first vertical plate portion 11b and the other second vertical plate portion 12b. At this time, the third upper layer precast members 23 that are connected in the longitudinal direction are installed with gaps between them. A gap of about 15 mm should be left between each precast member. In this embodiment, in consideration of the workability of constructing the foundation structure 100, two relatively small third upper layer precast members 23 are used and installed by connecting them longitudinally, but it is also possible to use one third upper layer precast member having the size of two third upper layer precast members 23 integrated together.

[0043] Next, as shown in FIG. 11(b), the first upper layer precast member 21 is placed on the lower layer precast member 10. Specifically, the first upper layer precast member 21 is placed on the upper surface of the portion of the first lower layer body 110 where the first flat plate portions 11a of the pair of first lower layer precast members 11 abut against each other. At this time, adjacent first upper layer precast members 21 are installed with a gap between them. Also, the first lower layer precast member 21 and the third upper layer precast member 23 are installed with a gap between them. A gap of about 15 mm should be left between each precast member. In this embodiment, in consideration of the workability of constructing the foundation structure 100, two relatively small first upper layer precast members 21 are used and installed side by side, but it is also possible to use one first upper layer precast member that is the size of the two first upper layer precast members 21 integrated together.

[0044] Next, as shown in FIG. 12( a ), the second upper layer precast member 22 is placed on the lower layer precast member 10 . Specifically, the recess 22a of the second upper layer precast member 22 is installed so as to fit over the portion of the second lower layer body 120 where one of the second vertical plate portions 12b is butted against the other. At this time, the second upper layer precast member 22 is installed with a gap between it and the first upper layer precast member 21 and the third upper layer precast member 23. A gap of about 15 mm should be left between each precast member.

[0045] In this way, when the upper layer precast members 20 (21, 22, 23) are placed on the lower layer precast members 10 (11, 12, 13) (see Figure 12(a)), the through holes H of each precast member are connected to each other. In this embodiment, the upper precast members were installed on the lower precast member 10 in the order of the third upper precast member 23, the first upper precast member 21, and the second upper precast member 22, but the order in which each upper precast member (21, 22, 23) is installed on the lower precast member 10 is arbitrary, and they may be installed in an order that is easiest for work at each site.

[0046] Next, as shown in FIG. 12(a), predetermined reinforcing bars 30 are inserted into the through holes H that connect the precast members. For example, the inner diameter of the through hole H is 40 mm, and the diameter of a specified reinforcing bar 30 is 16 mm. Since the inner diameter of the through hole H is larger than the diameter of the reinforcing bar 30, it is easy to insert the reinforcing bar 30 into the through hole H, and the reinforcing bar 30 can be inserted into the through hole H relatively smoothly.

[0047] Next, when a predetermined number of reinforcing bars 30 have been inserted into the through holes H connecting each precast member (the stage between Figures 12(a) and 12(b)), the levels of the first lower precast member 21, the second upper precast member 22 and the third upper precast member 23 installed on the lower precast member 10 are adjusted (made horizontal and vertical). For this level adjustment (leveling and vertical alignment), a thin plate material with a thickness of about 2 mm called a liner plate is used. Note that the thin plate material is not shown in Figure 12. Specifically, a thin plate material is inserted between the lower precast member 10 and the first upper precast member 21 to adjust the posture of the first upper precast member 21 relative to the lower precast member 10. Similarly, thin plates are inserted between the lower precast member 10 and the second upper precast member 22, and between the lower precast member 10 and the third upper precast member 23, to adjust the posture of the second upper precast member 22 and the third upper precast member 23 relative to the lower precast member 10. The thin plate material is inserted into at least one of the four corners on the underside of the first upper layer precast member 21, the second upper layer precast member 22, and the third upper layer precast member 23 to adjust the level of the first upper layer precast member 21, the second upper layer precast member 22, and the third upper layer precast member 23. The number of thin plate materials to be inserted per location is optional. Furthermore, if level adjustment is not required, it is not necessary to insert a thin plate material.

[0048] In particular, in this embodiment, as described above, there is a predetermined clearance between the through hole H and the reinforcing bar 30, and the reinforcing bar 30 can be inserted at an angle to the extension direction of the through hole H. Therefore, even if the level of the upper precast members (21, 22, 23) is adjusted using thin plate material and the posture of the upper precast members (21, 22, 23) changes to the extent of the level adjustment, the reinforcing bar 30 inserted into the through hole H does not interfere with the level adjustment, and the desired level adjustment can be made. In addition, a gap of approximately 15 mm is provided between adjacent precast members as a clearance, so that the level of the upper precast members (21, 22, 23) can be adjusted using thin plate material, and even if the posture of each upper precast member (21, 22, 23) changes to the extent of the level adjustment, adjacent upper precast members will not interfere with each other's level adjustment, and the desired level adjustment can be performed. In addition, level adjustment (leveling and vertical adjustment) may be performed when each upper layer precast member (21, 22, 23) is installed on the lower layer precast member 10, and then level adjustment may be performed again at this stage when the reinforcing bar 30 is inserted into the through hole H.

[0049] After completing the level adjustment of all the upper layer precast members (21, 22, 23), as shown in Figure 12 (b), a solidification material M such as grout is poured into the through holes H, and the solidification material M is filled between the through holes H and the reinforcing bars 30. The solidification material M is filled into each through hole H until it flows out of the gaps between the precast members. In addition, if the solidification material M does not flow out from the gaps between the precast members, the solidification material M is filled into those gaps. In addition, the solidification material M is also filled into the gaps between the precast members formed by inserting the thin plate material. In this way, the solidification material M is filled between the through holes H and the reinforcing bars 30 and in the gaps between each precast member.

[0050] By solidifying the solidification material M filled in the predetermined locations in this manner, the base structure 100 shown in FIG. 1 can be constructed.

[0051] In this way, with the foundation structure 100 of this embodiment, by installing the upper precast members 20 (21, 22, 23) so that they fit together on the lower precast members 10 (11, 12, 13), the lower precast members 10 and the upper precast members 20 are less likely to shift, and the lower precast members 10 and the upper precast members 20 can be easily integrated, so the foundation structure 100 can be constructed in a relatively short period of time. Then, after installing the first lower layer precast member 11, the second lower layer precast member 12, the third lower layer precast member 13 and the first upper layer precast member 21, the second upper layer precast member 22, and the third upper layer precast member 23 in a predetermined arrangement, the predetermined reinforcing bars 30 are inserted into the through holes H connecting each precast member, and the solidifying material M is poured into the through holes H to fill them, and the solidifying material M is allowed to solidify, thereby constructing the structure. In particular, by omitting the base concrete (leveling concrete) used in the prior art (Patent Document 1 above) and using lower precast members 10 (11, 12, 13), the construction period can be shortened by the time required for curing the concrete, making it possible to construct the foundation structure 100 in a shorter period of time.

[0052] In addition, friction resistance portions 10a are formed on the undersides of the lower precast members 10 (11, 12, 13), making it difficult for the first lower precast member 11, the second lower precast member 12, and the third lower precast member 13 installed on the ground G to slip from the ground surface G. Therefore, the lower precast members 10 (11, 12, 13) can be installed in a stable state at a predetermined position on the ground G, and the lower precast members 10 can function suitably as base slab concrete (leveling concrete).

[0053] Furthermore, by providing a predetermined clearance between the through hole H and the reinforcing bar 30, and also by providing a predetermined clearance between adjacent upper precast members (21, 22, 23), when level adjustment of the first upper precast member 21, the second upper precast member 22, and the third upper precast member 23 is performed using thin plate material, even if the posture of each upper precast member (21, 22, 23) changes to the extent of the level adjustment, the reinforcing bar will not come into contact with the precast members, and the precast members will not come into contact with each other, so the level adjustment will not be hindered, and the desired level adjustment can be performed, allowing the foundation structure 100 to be constructed appropriately.

[0054] As described above, the foundation structure 100 of this embodiment can be suitably constructed in a relatively short period of time.

[0055] The present invention is not limited to the above embodiment. For example, as shown in Figure 13, it is possible to expand the foundation structure 100 by adding lower precast members 10 (11, 12, 13) and upper precast members 20 (21, 22, 23) in the front-to-back or left-to-right directions.

[0056] In the above embodiment, the foundation structure 100 is constructed by placing two sets of second lower bodies 120 in a position sandwiching the first lower body 110, as shown in Figure 10(b). However, the present invention is not limited to this, and the foundation structure 100 may also be constructed by placing the second lower body 120 in a position along at least one of the front and back sides of the first lower body 110. In this case, the number and length of the third lower layer precast members 13 may be adjusted appropriately, and the number and length of the third upper layer precast members 23 may be adjusted appropriately.

[0057] Furthermore, it goes without saying that other specific detailed structures and the like can be modified as appropriate. [Explanation of symbols]

[0058] 10a Friction resistance part 11(10) First lower level precast member 11a 1st flat plate part 11b 1st vertical plate part 12(10) Second Lower Precast Member 12a 2nd flat plate part 12b 2nd vertical plate part 13(10) Third Lower Precast Member 13a 3rd flat plate part 13b 3rd vertical plate part 21(20) First upper precast member 22(20) Second upper precast member 22a Recess 23(20) Third upper precast member 23a Recess 30 Specified reinforcing bars H through hole 100 Basic structure 100a foundation rebar G Ground (ground surface) M Solidified material

Claims

1. A foundation structure comprising a lower layer precast member installed on the ground and an upper layer precast member installed on the lower layer precast member, The lower layer precast member is a pair of first lower layer precast members each having a first flat plate portion and a first vertical plate portion erected from one end of the first flat plate portion, and each having a generally L-shape in front view; a pair of second lower layer precast members each having a second flat plate portion and a second vertical plate portion erected from both ends of the second flat plate portion, and each having a generally U-shaped configuration when viewed from the front; a pair of third lower layer precast members each having a third flat plate portion and a third vertical plate portion erected from one end of the third flat plate portion, and each having a generally L-shape in front view; The pair of first lower layer precast members constitute a first lower layer body that is installed so that the first flat plate portions are butted against each other to form a generally U-shaped structure in a front view, The pair of second lower layer precast members are installed so that one of the second vertical plate portions is butted against the other to form a roughly mountain-shaped front view, and the other second vertical plate portion is installed in an orientation that connects to the first vertical plate portion of the first lower layer precast member and is positioned along at least one of the front and back of the first lower layer body, thereby forming a second lower layer body; The pair of third lower layer precast members constitute a third lower layer body that is installed in an arrangement sandwiching the first lower layer body and the second lower layer body in an orientation in which the third vertical plate portion is juxtaposed with the connected first vertical plate portion and the other second vertical plate portion, The upper layer precast member is a first upper layer precast member installed on the upper surface of the portion of the first lower layer body where the first flat plate portions of the pair of first lower layer precast members are butted against each other; a second upper layer precast member having a recess and a generally inverted U-shape in front view, the recess being fitted over and covering the portion of the second lower layer where one of the second vertical plate portions is butted against the other; a third upper layer precast member having a recess and a generally inverted U-shape in front view, the recess being fitted over the portion where the third vertical plate portion is arranged next to the first vertical plate portion and the other second vertical plate portion; The first vertical plate portions of the pair of first lower layer precast members constituting the first lower layer body are provided with through holes along the direction in which the first vertical plate portions face each other, The second vertical plate portions of the pair of second lower layer precast members constituting the second lower layer body are provided with through holes along the direction in which the second vertical plate portions face each other, The third vertical plate portion of a pair of third lower layer precast members constituting the third lower layer body is provided with a through hole communicating with the through hole of the first vertical plate portion and a through hole communicating with the through hole of the second vertical plate portion, The first upper-story precast member has a through hole provided at a position connected to the through hole of the first vertical plate portion of the first lower-story precast member, The second upper layer precast member has a through hole provided at a position connected to the through hole of the second vertical plate portion of the second lower layer precast member, The third upper-level precast member has through holes at positions communicating with the through holes of the first vertical plate portion of the first lower-level precast member and the through holes of the third vertical plate portion of the third lower-level precast member, and at positions communicating with the through holes of the second vertical plate portion of the second lower-level precast member and the through holes of the third vertical plate portion of the third lower-level precast member, When the upper layer precast member is placed on the lower layer precast member, a predetermined reinforcing bar can be inserted into the through hole connecting the upper layer precast member and the lower layer precast member, A foundation structure characterized in that the inner diameter of the through hole is larger than the diameter of the specified reinforcing bar.

2. The foundation structure described in claim 1, characterized in that two sets of the second lower layers are installed in an arrangement sandwiching the first lower layer in a direction connecting the other second vertical plate portion to the first vertical plate portion.

3. 3. The foundation structure according to claim 1, wherein a solidifying material is filled between the through hole and the predetermined reinforcing bar inserted into the through hole.

4. The first upper precast member, the second upper precast member, and the third upper precast member are installed on the lower precast member with gaps between them; 4. The substructure according to claim 1, wherein the gap is filled with a solidifying material.

5. Between the lower layer precast member and the first upper layer precast member; Between the lower layer precast member and the second upper layer precast member; A thin plate material for level adjustment can be inserted between the lower precast member and the third upper precast member, A foundation structure according to any one of claims 1 to 4, characterized in that the gaps between the precast members into which the thin plate material is inserted are filled with a solidifying material.

6. A foundation structure as described in any one of claims 1 to 5, characterized in that the undersides of the first lower layer precast member, the second lower layer precast member and the third lower layer precast member are formed with friction resistance portions consisting of unevenness to increase friction resistance with the ground surface.

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