Basic constructs

Abstract

To provide a foundation structure capable of building quickly.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 first upper layer precast material 21, and a second upper layer precast material 22 to a predetermined placement, and subsequently a solidification material M is poured to fill between the respective members and by solidifying the solidification material M. In particular, by omitting a bottom slab concrete (leveled concrete) in the conventional technology, and by using the first underlayer precast material 11 and the second underlayer precast material 12, since 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 precast member includes a first lower precast member and a second lower precast member disposed along at least one side of the first lower precast member, The upper precast member includes a first upper precast member placed on the first lower precast member, and a second upper precast member placed on the second lower precast member and positioned along at least one side of the first upper precast member, a first reinforcing bar extending upward is disposed on the upper surface of the first lower layer precast member; A joint to which a second reinforcing bar is connected is provided on the upper surface of the second lower layer precast member, The first upper layer precast member has a first through hole in the vertical direction at a position corresponding to the first reinforcing bar, through which the first reinforcing bar can be inserted; The second upper layer precast member has a second through hole in the vertical direction at a position corresponding to the joint through which a second reinforcing bar to be connected to the joint can be inserted, The inner diameter of the first through hole is larger than the diameter of the first reinforcing bar, and the inner diameter of the second through hole is larger than the diameter of the second reinforcing bar. And, a third reinforcing bar extending laterally is disposed on a side surface of the second upper layer precast member facing the first upper layer precast member; a joint hole for connecting the third reinforcing bar to the first upper layer precast member is provided on the side of the first upper layer precast member facing the second upper layer precast member at a position corresponding to the third reinforcing bar; The inner diameter of the joint hole is larger than the diameter of the third reinforcing bar. I made sure that there was. Here, since the inner diameter of the first through hole is larger than the diameter of the first reinforcing bar, a predetermined clearance is provided between the inner wall of the first through hole and the first reinforcing bar.Therefore, even if the first reinforcing bar is slightly tilted relative to the first through hole due to, for example, level adjustment of the first upper layer precast member, the first reinforcing bar is less likely to come into contact with the inner wall of the first through hole. Furthermore, since the inner diameter of the second through hole is larger than the diameter of the second reinforcing bar, a predetermined clearance is provided between the inner wall of the second through hole and the second reinforcing bar.Therefore, even if the second reinforcing bar is slightly angled relative to the second through hole due to, for example, level adjustment of the second upper layer precast member, the second reinforcing bar is less likely to come into contact with the inner wall of the second through hole. Furthermore, since the inner diameter of the joint hole is larger than the diameter of the third reinforcing bar, a certain clearance is provided between the inner wall of the joint hole and the third reinforcing bar.Therefore, even if the third reinforcing bar is slightly angled relative to the joint hole due to level adjustments of the first upper layer precast member or the second upper layer precast member, the third reinforcing bar is less likely to come into contact with the inner wall of the joint hole.

[0007] In a foundation structure configured in this manner, the inner diameter of the first through hole is larger than the diameter of the first reinforcing bar, allowing the first reinforcing bar to be inserted at an angle to the extension direction of the first through hole, and the inner diameter of the second through hole is larger than the diameter of the second reinforcing bar, allowing the second reinforcing bar to be inserted at an angle to the extension direction of the second through hole.Therefore, even if there is a slight misalignment in the arrangement of the first lower layer precast member and the first upper layer precast member, or the arrangement of the second lower layer precast member and the second upper layer precast member, it is possible to install the first upper layer precast member on top of the first lower layer precast member, or the second upper layer precast member on top of the second lower layer precast member, 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 first lower layer precast member is adjusted using thin plate material, or the level of the second upper layer precast member on the second lower layer precast member is adjusted using thin plate material, even if the posture of the first upper layer precast member or the second upper layer precast member changes to the extent of the level adjustment, the first reinforcing bar will not come into contact with the first upper layer precast member (first through hole), and the second reinforcing bar will not come into contact with the second upper layer precast member (second through hole), and this will not hinder the level adjustment, so the desired level adjustment can be made and the foundation structure can be constructed appropriately. Furthermore, if the inner diameter of the joint hole is larger than the diameter of the third reinforcing bar and the third reinforcing bar can be inserted at an angle to the extension direction of the joint hole, the first upper layer precast member and the second upper layer precast member can be installed side by side even if there is a slight misalignment in the positioning of the first upper layer precast member and the second upper layer precast member. Furthermore, for example, if the level of the first upper layer precast member on the first lower layer precast member is adjusted using thin plate material, or the level of the second upper layer precast member on the second lower layer precast member is adjusted using thin plate material, even if the posture of the first upper layer precast member or the second upper layer precast member changes to the extent of the level adjustment, the third reinforcing bar and the first upper layer precast member (joint hole) will not come into contact and will not interfere with the level adjustment, so the desired level adjustment can be made.

[0008] In particular, by omitting the base slab concrete (leveling concrete) used in the prior art (Patent Document 1 above) and using first and second 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 second lower layer precast members are installed in a position sandwiching the first lower layer precast members, The second upper layer precast members are arranged so as to sandwich the first upper layer precast members.

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

[0011] Also, preferably, A solidifying material is filled between the first through hole and the first reinforcing bar and between the second through hole and the second reinforcing bar.

[0012] A stronger foundation structure can be constructed by filling and solidifying a solidifying material between the first through-hole and the first rebar and between the second through-hole and the second rebar.

[0015] Also, preferably, A solidifying material is filled between the joint hole and the third reinforcing bar.

[0016] A stronger foundation structure can be constructed by filling the space between the joint hole and the third rebar with solidifying material and allowing it to solidify.

[0017] Also, preferably, The first upper layer precast member and the second upper layer precast member are arranged side by side with a gap therebetween, The gap is filled with a solidifying material.

[0018] If the first upper layer precast member and the second upper layer precast member are arranged side by side with a gap between them, for example, the level of the first upper layer precast member on the first lower layer precast member can be adjusted using thin plate material, or the level of the second upper layer precast member on the second lower layer precast member can be adjusted using thin plate material.Even if the posture of the first upper layer precast member or the second upper layer precast member changes to the extent of the level adjustment, the first upper layer precast member and the second upper layer precast member will not come into contact 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.

[0019] Also, preferably, A thin plate material for horizontal adjustment (level adjustment) can be inserted between at least one of the first lower precast member and the first upper precast member and the second lower precast member and the second upper precast member, The gaps between the precast members formed by inserting the thin plate materials are filled with a solidifying material.

[0020] A foundation structure can be constructed by filling and solidifying solidifying material into gaps that occur when leveling the first upper layer precast member on the first lower layer precast member using thin plate material, or gaps that occur when leveling the second upper layer precast member on the second lower layer precast member using thin plate material.

[0021] Also, preferably, The undersides of the first lower layer precast member and the second lower layer precast member are formed with friction resistance portions consisting of projections and depressions to increase friction resistance with the ground surface.

[0022] Since friction resistance portions that increase friction resistance with the ground surface are formed on the undersides of the first lower layer precast member and the second lower layer precast member, the first lower layer precast member and the second lower layer precast member installed on the ground are less likely to slip from the ground surface, and the first lower layer precast member and the second lower layer precast member can be installed in a stable position on the ground. The first lower layer precast members and the second lower layer precast members can be made to function favorably as, for example, the base concrete (leveling concrete) of the prior art (Patent Document 1 mentioned above). [Effects of the Invention]

[0023] 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]

[0024] [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 and FIG. 1B is a side view showing the first lower layer precast member that constitutes the foundation structure. [Figure 4] 1A and 1B are a top view and a side view, respectively, showing the second lower layer precast member that constitutes the foundation structure. [Figure 5] 1A is a top view, FIG. 1B is a front view, and FIG. 1C is a side view showing the first upper layer precast member that constitutes the foundation structure. [Figure 6] 1A is a top view, FIG. 1B is a front view, and FIG. 1C is a side view showing the second upper layer precast member that constitutes the foundation structure. [Figure 7] 1A, 1B, and 1C are explanatory diagrams showing the procedure for constructing the foundation structure of this embodiment. [Figure 8] 1A and 1B are explanatory diagrams showing a procedure for constructing a foundation structure according to this embodiment. [Figure 9]1A, 1B, and 1C are explanatory diagrams showing the procedure for constructing the foundation structure of this embodiment. [Figure 10] FIG. 10 is a perspective view showing a modified example of the foundation structure. DETAILED DESCRIPTION OF THE INVENTION

[0025] 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.

[0026] The foundation structure 100 of this embodiment comprises, for example, a lower precast member 10 (11, 12) placed on the ground G and an upper precast member 20 (21, 22) placed on the lower precast member 10, as shown in Figures 1 and 2(a)(b)(c).

[0027] The lower precast member 10 has a first lower precast member 11 and a second lower precast member 12 arranged so as to sandwich the first lower precast member 11 therebetween. In this embodiment, two first lower layer precast members 11 are arranged side by side and installed on the ground G, and two second lower layer precast members 12 are arranged side by side and installed on the ground G, sandwiched between the two first lower layer precast members 11.

[0028] The upper layer precast member 20 has a first upper layer precast member 21 installed on the first lower layer precast member 11, and a second upper layer precast member 22 installed on the second lower layer precast member 12 and positioned so as to sandwich the first upper layer precast member 21. In this embodiment, a first upper layer precast member 21 is installed on top of two first lower layer precast members 11, and a second upper layer precast member 22 is installed on top of two second lower layer precast members 12. In this embodiment, taking into consideration the workability of constructing the foundation structure 100, relatively small first lower layer precast members 11 and second lower layer precast members 12 are used, and two of each are arranged side by side.However, it is also possible to use one first lower layer precast member that is the same size as the two side-by-side first lower layer precast members 11, or one second lower layer precast member that is the same size as the two side-by-side second lower layer precast members 12.

[0029] As shown in FIGS. 3(a) and 3(b), a first reinforcing bar 30 is disposed on the top surface of the first lower layer precast member 11 and extends upward. In the first lower layer precast member 11 of this embodiment, two first reinforcing bars 30 are disposed. Specifically, a substantially L-shaped first reinforcing bar 30 is arranged in the first lower layer precast member 11 so that one end of the first reinforcing bar 30 extends upward from the top surface. Note that other reinforcing bars and ties 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.

[0030] As shown in Figures 4(a) and (b), joints 41 to which second reinforcing bars 40 (see Figures 9(a) and (b)) are connected are arranged on the upper surface of the second lower layer precast member 12. In this embodiment, two joints 41 are provided in the second lower layer precast member 12. Specifically, a substantially L-shaped leading reinforcing bar 41a is connected to the lower part of the joint 41, and the joint 41 is embedded so that its upper opening is exposed on the top surface of the second lower layer precast member 12. Note that other reinforcing bars and ties are arranged in the second lower layer precast member 12, but these are not shown in the figure. 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.

[0031] As shown in Figures 5(a), (b), and (c), the first upper layer precast member 21 has a first through hole 50 in the vertical direction at a position corresponding to the first reinforcing bar 30 of the first lower layer precast member 11, through which the first reinforcing bar 30 can be inserted. The first upper layer precast member 21 of this embodiment is provided with four first through holes 50. The first through holes 50 are formed using sheath tubes. The inner diameter of the first through hole 50 is larger than the diameter of the first reinforcing bar 30. In other words, there is a predetermined clearance between the first through hole 50 and the first reinforcing bar 30, and the first reinforcing bar 30 can be inserted into the first through hole 50 at an angle to the extension direction of the first through hole 50.

[0032] In addition, on the side of the first upper layer precast member 21 facing the second upper layer precast member 22, a joint hole 70 is provided at a position corresponding to the third reinforcing bar 80 described below, to which the third reinforcing bar 80 is connected. The first upper layer precast member 21 of this embodiment has four joint holes 70 formed therein. The inner diameter of the joint hole 70 is larger than the diameter of the third reinforcing bar 80 of the second upper layer precast member 22. In other words, there is a predetermined clearance between the joint hole 70 and the third reinforcing bar 80, and the third reinforcing bar 80 can be inserted into the joint hole 70 at an angle to the extension direction of the joint hole 70. Such a joint hole 70 can be formed, for example, by embedding a mortar-filled sleeve-shaped joint so that one opening thereof is exposed to the side surface of the first upper layer precast member 21. In addition, the front and rear surfaces of the first upper layer precast member 21 are each formed with a communication hole (not shown) long enough to reach the joint hole 70. This communication hole is provided to allow the joint hole 70 to be filled with solidified material.

[0033] Furthermore, the first upper layer precast member 21 has foundation reinforcing bars 100a arranged thereon, extending upward from the top surface thereof. In the first upper layer precast member 21 of this embodiment, four 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.

[0034] As shown in Figures 6(a)(b)(c), the second upper layer precast member 22 has a second through hole 60 in the vertical direction at a position corresponding to the joint 41 of the second lower layer precast member 12, through which a second reinforcing bar 40 to be connected to the joint 41 can be inserted. In this embodiment, the second upper layer precast member 22 is provided with four second through holes 60. These second through holes 60 are formed using sheath tubes. The inner diameter of the second through hole 60 is larger than the diameter of the second reinforcing bar 40. In other words, there is a predetermined clearance between the second through hole 60 and the second reinforcing bar 40, and the second reinforcing bar 40 can be inserted into the second through hole 60 at an angle to the extension direction of the second through hole 60.

[0035] Additionally, third reinforcing bars 80 extending laterally are arranged on the side of the second upper layer precast member 22 facing the first upper layer precast member 21. In the second upper layer precast member 22 of this embodiment, four third reinforcing bars 80 are disposed. Specifically, the upper two of the four third reinforcing bars 80 are straight third reinforcing bars 80 arranged so that one end thereof extends laterally from the side surface, and the lower two of the four third reinforcing bars 80 are approximately L-shaped third reinforcing bars 80 arranged so that one end thereof extends laterally from the side surface. Note that other reinforcing bars and ties are arranged in the second upper story precast member 22, but these are not shown in the drawings. This third reinforcing bar 80 is inserted into a joint hole 70 provided in the first upper layer precast member 21.

[0036] 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 first upper layer precast member 21, and the second upper layer precast member 22 will be described.

[0037] First, two first lower layer precast members 11 are placed side by side on the ground G. Then, as shown in FIG. 7( a ), two second lower layer precast members 12 are placed side by side on the ground G, sandwiching the two first lower layer precast members 11 . At this time, the first lower layer precast member 11 and the second lower layer precast member 12 are installed with a gap between them. The first lower layer precast member 11 and the first lower layer precast member 11, and the second lower layer precast member 12 and the second lower layer precast member 12 are also installed with a gap between them. A gap of about 15 mm should be left between each precast member.

[0038] Here, friction resistance portions 10a are formed on the undersides of the first lower layer precast member 11 and the second lower layer precast member 12, so the first lower layer precast member 11 and the second lower layer precast member 12 installed on the ground G are less likely to slip from the ground surface G, and the first lower layer precast member 11 and the second lower layer precast member 12 can be installed in a predetermined position on the ground G in a stable state. 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) placed on the lower precast members (11, 12) can be 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) on the ground G.

[0039] Next, as shown in Figures 7(b) and (c), the first upper layer precast member 21 is placed on the first lower layer precast member 11. At this time, the first reinforcing bars 30 of the first lower layer precast member 11 are inserted into the first through holes 50 of the first upper layer precast member 21 . For example, the inner diameter of the first through hole 50 is 40 mm, and the diameter of the first reinforcing bar 30 is 16 mm. Since the inner diameter of the first through hole 50 is larger than the diameter of the first reinforcing bar 30, it is easy to insert the first reinforcing bar 30 into the first through hole 50, and the first upper layer precast member 21 can be installed on the first lower layer precast member 11 relatively smoothly.

[0040] Next, as shown in FIG. 8( a ), a second upper layer precast member 22 is temporarily placed on the second lower layer precast member 12 at a position spaced apart from the first upper layer precast member 21 . Then, as shown in Figure 8(b), the second upper layer precast member 22 is moved so that it is placed next to the first upper layer precast member 21, and the second upper layer precast member 22 is installed in a position sandwiching the first upper layer precast member 21. At this time, the third reinforcing bars 80 of the second upper layer precast member 22 are inserted into the joint holes 70 of the first upper layer precast member 21. For example, the inner diameter of the joint hole 70 is 30 mm, and the diameter of the third reinforcing bar 80 is 16 mm.Since the inner diameter of the joint hole 70 is larger than the diameter of the third reinforcing bar 80, it is easy to insert the third reinforcing bar 80 into the joint hole 70, and the second upper layer precast member 22 can be installed alongside the first upper layer precast member 21 relatively smoothly. At this time, the first upper layer precast member 21 and the second upper layer precast member 22 are arranged side by side with a gap therebetween. A gap of about 15 mm should be provided between the precast members.

[0041] Next, as shown in Figures 9(a) and (b), the second reinforcing bar 40 is inserted into the second through hole 60 of the second upper layer precast member 22, and the second reinforcing bar 40 is connected to the joint 41 of the second lower layer precast member 12. For example, the inner diameter of the second through hole 60 is 40 mm, and the diameter of the second reinforcing bar 40 is 16 mm. Since the inner diameter of the second through hole 60 is larger than the diameter of the second reinforcing bar 40, it is easy to insert the second reinforcing bar 40 into the second through hole 60, and the second reinforcing bar 40 can be connected to the joint 41 relatively smoothly. In addition, the upper end portion of the second reinforcing bar 40 connected to the joint 41 that protrudes from the second through hole 60 of the second upper layer precast member 22 is appropriately cut off.

[0042] Next, at the stage shown in Figure 9(b), the levels of the first upper layer precast member 21 and the second upper layer precast member 22 installed on the lower layer precast members (11, 12) are adjusted (adjusted to be 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 9(b). Specifically, a thin plate material is inserted between the first lower layer precast member 11 and the first upper layer precast member 21 to adjust the posture of the first upper layer precast member 21 relative to the first lower layer precast member 11. Similarly, thin plates are inserted between the second lower layer precast member 12 and the second upper layer precast member 22 to adjust the position of the second upper layer precast member 22 relative to the second lower layer precast member 12. 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 and the second upper layer precast member 22 to adjust the level of the first upper layer precast member 21 and the second upper layer precast member 22. The number of thin plate materials to be inserted per location is arbitrary. Furthermore, if level adjustment is not required, it is not necessary to insert a thin plate material.

[0043] In particular, as described above, in this embodiment, there is a predetermined clearance between the first through hole 50 and the first reinforcing bar 30, and the first reinforcing bar 30 can be inserted at an angle to the extension direction of the first through hole 50.Therefore, even if the level of the first upper layer precast member 21 is adjusted using thin plate material and the posture of the first upper layer precast member 21 changes to the extent of the level adjustment, the first reinforcing bar 30 of the first lower layer precast member 11 does not interfere with the level adjustment, and the desired level adjustment can be made. Similarly, there is a predetermined clearance between the second through hole 60 and the second reinforcing bar 40, and the second reinforcing bar 40 can be inserted at an angle to the extension direction of the second through hole 60.Therefore, even if the level of the second upper layer precast member 22 is adjusted using thin plate material and the posture of the second upper layer precast member 22 changes to the extent of the level adjustment, the second reinforcing bar 40 connected to the joint 41 of the second lower layer precast member 12 does not interfere with the level adjustment, and the desired level adjustment can be made. Similarly, there is a predetermined clearance between the joint hole 70 and the third reinforcing bar 80, and the third reinforcing bar 80 can be inserted at an angle to the extension direction of the joint hole 70.Therefore, even if the level of the first upper layer precast member 21 and the second upper layer precast member 22 is adjusted using thin plate material and the posture of the first upper layer precast member 21 or the second upper layer precast member 22 changes to the extent of the level adjustment, the third reinforcing bar 80 of the second upper layer precast member 22 does not interfere with the level adjustment, and the desired level adjustment can be made.

[0044] In addition, a gap of approximately 15 mm is provided as a clearance between the first upper layer precast member 21 and the second upper layer precast member 22, which are arranged side by side, so that the level of the first upper layer precast member 21 and the second upper layer precast member 22 can be adjusted using thin plate material, and even if the posture of the first upper layer precast member 21 or the second upper layer precast member 22 changes to the extent of the level adjustment, the first upper layer precast member 21 or the second upper layer precast member 22 will not interfere with each other's level adjustment, and the desired level adjustment can be made. In addition, the first upper layer precast member 21 installed on the first lower layer precast member 11 may be leveled (to make it horizontal and vertical) at the stage shown in Figure 7(c), and then leveled again at the stage shown in Figure 9(b).

[0045] After completing the level adjustment of the first upper layer precast members 21 and the second upper layer precast members 22, a solidifying material M such as grout is filled between the members as shown in FIG. 9(c). Specifically, the solidifying material M is poured into the first through-hole 50 , and the solidifying material M is filled between the first through-hole 50 and the first reinforcing bar 30 . Furthermore, the solidifying material M is poured into the second through-hole 60, and the solidifying material M is filled between the second through-hole 60 and the second reinforcing bar 40. In addition, solidified material M is poured into the joint hole 70 through communicating holes (not shown) provided on the front and rear surfaces of the first upper layer precast member 21, and the solidified material M is filled between the joint hole 70 and the third reinforcing bar 80.

[0046] In addition, solidification material M is poured into and filled into the gap between the first lower layer precast member 11 and the second lower layer precast member 12, and the gap between the first upper layer precast member 21 and the second upper layer precast member 22. In addition, solidification material M is poured into and filled into the gap between the first lower layer precast member 11 and the first upper layer precast member 21, into which thin plate material has been inserted, and into the gap between the second lower layer precast member 12 and the second upper layer precast member 22, into which thin plate material has been inserted.

[0047] 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.

[0048] In this way, the foundation structure 100 of this embodiment can be constructed by installing the first lower layer precast member 11, the second lower layer precast member 12, the first upper layer precast member 21, and the second upper layer precast member 22 in a predetermined arrangement, pouring solidification material M into the spaces between each member to fill them, and then allowing the solidification material M to solidify. In particular, by omitting the base slab concrete (leveling concrete) used in the prior art (Patent Document 1 above) and using the first lower layer precast member 11 and the second lower layer precast member 12, the construction period can be shortened by the time required for the concrete to cure, making it possible to construct the foundation structure 100 in a shorter period of time.

[0049] In addition, friction resistance portions 10a are formed on the undersides of the first lower layer precast member 11 and the second lower layer precast member 12, making the first lower layer precast member 11 and the second lower layer precast member 12 installed on the ground G less likely to slip from the ground surface G.Therefore, the first lower layer precast member 11 and the second lower layer precast member 12 can be installed in a predetermined position on the ground G in a stable state, and the first lower layer precast member 11 and the second lower layer precast member 12 can function suitably as base slab concrete (leveling concrete).

[0050] Furthermore, by providing a predetermined clearance between the first through hole 50 and the first reinforcing bar 30, between the second through hole 60 and the second reinforcing bar 40, and between the joint hole 70 and the third reinforcing bar 80, and also by providing a predetermined clearance between the first upper layer precast member 21 and the second upper layer precast member 22 which are arranged side by side, when level adjustment of the first upper layer precast member 21 and the second upper layer precast member 22 is performed using thin plate material, even if the posture of the first upper layer precast member 21 or the second upper layer precast member 22 changes by the amount of level adjustment, the reinforcing bars will not come into contact with the precast members or the precast members will not come into contact with each other, and this will not hinder the level adjustment, so the desired level adjustment can be performed and the foundation structure 100 can be constructed appropriately.

[0051] As described above, the foundation structure 100 of this embodiment can be suitably constructed in a relatively short period of time.

[0052] The present invention is not limited to the above embodiment. For example, as shown in Figure 10, a joint hole 70 to which the third reinforcing bar 80 is connected may be provided on the side of the second upper layer precast member 22 opposite to the side on which the third reinforcing bar 80 is arranged. This makes it possible to expand the foundation structure 100 by adding second lower layer precast members 12 and second upper layer precast members 22.

[0053] In the above embodiment, the foundation structure 100 has been described as an example in which the second lower layer precast member 12 is installed in a position sandwiching the first lower layer precast member 11, and the second upper layer precast member 22 is installed in a position sandwiching the first upper layer precast member 21. However, the present invention is not limited to this, and for example, the foundation structure may be one in which the second lower layer precast member 12 is installed in a position aligned with at least one side of the first lower layer precast member 11, and the second upper layer precast member 22 is installed in a position aligned with at least one side of the first upper layer precast member 21.

[0054] Furthermore, it goes without saying that other specific detailed structures and the like can be modified as appropriate. [Explanation of symbols]

[0055] 10a Friction resistance part 11(10) First lower precast member (lower precast member) 12(10) Second lower precast member (lower precast member) 21(20) First upper precast member (upper precast member) 22(20) Second upper precast member (upper precast member) 30 First Reinforcement Bar 40 Second rebar 41 Joint 50 First through hole 60 Second through hole 70 Joint hole 80 Third Reinforcement Bar 100 Basic structure 100a foundation rebar G site (site surface) M Curing 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 precast member includes a first lower precast member and a second lower precast member disposed along at least one side surface of the first lower precast member, The upper precast member includes a first upper precast member placed on the first lower precast member, and a second upper precast member placed on the second lower precast member and positioned along at least one side of the first upper precast member, a first reinforcing bar extending upward is disposed on the upper surface of the first lower layer precast member; A joint to which a second reinforcing bar is connected is provided on the upper surface of the second lower layer precast member, The first upper layer precast member has a first through hole in the vertical direction at a position corresponding to the first reinforcing bar, through which the first reinforcing bar can be inserted; The second upper layer precast member has a second through hole in the vertical direction at a position corresponding to the joint, through which a second reinforcing bar to be connected to the joint can be inserted, An inner diameter of the first through hole is larger than a diameter of the first reinforcing bar, and an inner diameter of the second through hole is larger than a diameter of the second reinforcing bar, a third reinforcing bar extending laterally is disposed on a side surface of the second upper layer precast member facing the first upper layer precast member; a joint hole for connecting the third reinforcing bar to the first upper layer precast member is provided on the side of the first upper layer precast member facing the second upper layer precast member at a position corresponding to the third reinforcing bar; A foundation structure characterized in that the inner diameter of the joint hole is larger than the diameter of the third reinforcing bar.

2. The second lower layer precast members are installed in a position sandwiching the first lower layer precast members, The foundation structure according to claim 1, wherein the second upper layer precast members are installed in a position sandwiching the first upper layer precast member.

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

4. The foundation structure according to any one of claims 1 to 3, characterized in that a solidifying material is filled between the joint hole and the third reinforcing bar.

5. The first upper layer precast member and the second upper layer precast member are arranged side by side with a gap therebetween, The substructure according to any one of claims 1 to 4, wherein the gaps are filled with a solidifying material.

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

7. A foundation structure as described in any one of claims 1 to 6, characterized in that the undersides of the first lower layer precast member and the second 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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