Foundation formwork system and method for constructing foundation formwork system

Abstract

To provide a foundation formwork system that allows components, such as beams and columns, to be easily positioned, thereby improving on-site workability.SOLUTION: A foundation formwork system 1 includes: a foundation formwork 20 having a first wall 21, a second wall 22 disposed opposite the first wall 21, and a bottom wall 23 connected to respective lower end parts of the first wall 21 and the second wall 22; and a beam 35 disposed between the first wall 21 and the second wall 22 in a facing direction X in which the first wall 21 and the second wall 22 face each other. An upper end of the beam 35 is positioned above an upper end of the second wall 22.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a basic formwork system and a construction method of the basic formwork system.

Background Art

[0002] Conventionally, a ground beam (beam) has been installed in a concrete foundation formwork (foundation formwork) at a construction site. In order to simplify on-site work, precast concrete foundation formwork may be used. Patent Document 1 discloses that precast concrete foundation formwork is connected to form a longitudinally continuous foundation formwork, and after embedding a steel beam or reinforcing bars therein, concrete is poured to simultaneously form a mat foundation and a ground beam.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the positions of the upper ends of the two side walls (the first wall and the second wall) of the precast concrete foundation formwork of Patent Document 1 are higher than the position of the upper end of the ground beam when viewed along the horizontal direction. For this reason, it is necessary to arrange the ground beam at a deep position between the two side walls, and it is difficult to perform the arrangement work of the ground beam. Further, in the configuration of Patent Document 1, since the upper end of the side wall is higher than the upper end of the ground beam, for example, when a column is erected on the ground beam, the side wall becomes an obstacle when connecting the ground beam and the column, making the work difficult.

[0005] The present disclosure has been made in view of such problems, and an object thereof is to provide a foundation formwork system and a construction method of the foundation formwork system that can easily arrange members such as beams and columns and have excellent workability at the site.

Means for Solving the Problem

[0006] The present disclosure provides a basic formwork system having a first wall, a second wall disposed opposite to the first wall, and a bottom wall respectively connected to a lower end portion of the first wall and a lower end portion of the second wall, and a beam disposed between the first wall and the second wall in a facing direction which is a direction in which the first wall and the second wall face each other, wherein an upper end of the beam is disposed above an upper end of the second wall.

Advantages of the Invention

[0007] In the basic formwork system and the construction method of the basic formwork system of the present disclosure, members such as beams and columns can be easily arranged, and the workability at the site is excellent.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] Hereinafter, an embodiment of a basic formwork system and a construction method of the basic formwork system according to the present disclosure will be described with reference to FIGS. 1 to 5. As shown in FIGS. 1 and 2, the basic formwork system 1 of the present embodiment constitutes an outer shape in a plan view of a building (not shown). In FIG. 1, the concrete 65 is shown by a two-dot chain line. For example, the basic formwork system 1 is formed in a rectangular outer peripheral shape in a plan view.

[0010] As shown in FIG. 2, a depression G2 is formed in the ground G corresponding to the shape of the basic formwork system 1. In FIG. 2 and FIG. 3 described later, the first outer wall 21 and the like of the basic formwork 20 described later are broken in the vertical direction. As shown in FIG. 1, a plurality of main column bases 100 are buried in the bottom surface of the depression G2 at intervals along the depression G2. For example, the main column base 100 is formed in a cylindrical shape with concrete. As shown in FIG. 2, on the bottom surface of the depression G2, a plaster mortar 102 is arranged between a plurality of main column bases 100 in the longitudinal direction (orthogonal direction Y) of the basic formwork 20 described later.

[0011] For example, in plan view, the upper surface of the inner ground G3 surrounded by the depression G2 is arranged below the upper surface of the outer ground G1 arranged outside the depression G2. Here, "A is arranged below B" means that "regardless of the position in the direction along the horizontal plane of A and B, A is arranged below B". The meaning of "A is arranged above B" is the same as that of "A is arranged below B". For example, crushed stones 104 are arranged on the inner ground G3.

[0012] As shown in FIGS. 1 to 3, the basic formwork system 1 includes a plurality of main columns (first columns) 10, a plurality of basic formworks 20, a plurality of connecting formworks 30, a beam 35, an intermediate column (second column) 45, and an outer wall 60. For example, the main column 10 is composed of H-shaped steel. That is, the main column 10 has a pair of flanges 11, 12 and webs 13 respectively joined to the flanges 11, 12. The main column 10 extends in the vertical direction. Here, "A extends (along) B" means that the angle formed by A and B is 30° or less. The meaning of "A follows B" is the same as that of "A extends along B". The lower end of the main column 10 is fixed to the main column foundation 100 by an anchor bolt or the like (not shown). A gusset plate (not shown) is fixed to the web 13 or the like of the main column 10 by welding or the like.

[0013] Note that the main column 10 may be made of reinforced concrete, CFT (Concrete Filled steel Tube), or the like.

[0014] As shown in FIG. 1, the foundation formwork 20 has a plurality of precast foundation formworks (precast concrete foundation formworks) 20a. Note that the number of precast foundation formworks 20a included in the foundation formwork 20 is not limited and may be one. As shown in FIG. 2, when viewed along the longitudinal direction (orthogonal direction Y, which will be described later) of the precast foundation formwork 20a, the precast foundation formwork 20a has a J shape. The precast foundation formwork 20a has a first outer wall (first wall) 21, a first inner wall (second wall) 22, a first bottom wall (bottom wall) 23, an outer inclined portion (first inclined portion) 24, and an inner inclined portion (second inclined portion) 25. The first outer wall 21, the first inner wall 22, and the first bottom wall 23 are each formed in a flat plate shape presenting a rectangular shape when viewed in the thickness direction thereof.

[0015] The first outer wall 21 and the first inner wall 22 extend in the vertical direction. The first inner wall 22 faces the first outer wall 21 in the facing direction X along a horizontal plane. The facing direction X is the direction in which the first outer wall 21 and the first inner wall 22 face each other. Here, the directions are defined as follows. Among the facing directions X, the side of the first outer wall 21 with respect to the first inner wall 22 is defined as the first side X1 (hereinafter, simply referred to as the first side X1). Among the facing directions X, the side opposite to the first side X1 (the side of the first inner wall 22 with respect to the first outer wall 21) is defined as the second side X2 (hereinafter, simply referred to as the second side X2). An orthogonal direction Y that is along a horizontal plane and orthogonal to the facing direction X is defined. Note that the orthogonal direction Y may be a direction that is along a horizontal plane and intersects the facing direction X. The orthogonal direction Y is the longitudinal direction of the beam 35. In the main column 10, the flange 11 is disposed on the first side X1 relative to the flange 12. The gusset plate 14 is fixed to the flange 11 by welding or the like. The gusset plate 14 protrudes from the flange 11 toward the first side X1.

[0016] In this example, the thickness (length in the facing direction X) of the first outer wall 21 is constant regardless of the vertical position. The thickness of the first inner wall 22 is constant regardless of the vertical position. Note that the thicknesses of the first outer wall 21 and the first inner wall 22 are not limited thereto, and for example, the thickness of the first outer wall may be gradually thicker as it goes downward. The first inner wall is similar to the first outer wall. The upper end of the first inner wall 22 is disposed below the upper end of the first outer wall 21.

[0017] The lower end of the first inner wall 22 and the lower end of the first outer wall 21 are disposed at the same position in the vertical direction. The first bottom wall 23 extends along a horizontal plane. The first bottom wall 23 is disposed between the first outer wall 21 and the first inner wall 22, and is connected to the lower end of the first outer wall 21 and the lower end of the first inner wall 22, respectively. In this example, the thickness (length in the vertical direction) of the first bottom wall 23 is constant regardless of the position in the facing direction X.

[0018] The outer inclined portion 24 is disposed on the second side X2 at the lower end of the first outer wall 21. In the outer inclined portion 24, the inner surface 24a (the surface facing the inside of the first outer wall 21 and the first inner wall 22) of the connection portion between the first outer wall 21 and the first bottom wall 23 is inclined so as to gradually approach the first inner wall 22 (towards the second side X2) as it goes downward. In this example, the outer inclined portion 24 has a triangular shape when viewed in the orthogonal direction Y. The inner inclined portion 25 is disposed on the first side X1 at the lower end of the first inner wall 22. In the inner inclined portion 25, the inner surface 25a of the connecting portion between the first inner wall 22 and the first bottom wall 23 is inclined so as to gradually approach the first outer wall 21 (toward the first side X1) as it goes downward. In this example, the inner inclined portion 25 has a triangular shape when viewed in the orthogonal direction Y.

[0019] As shown in FIG. 1, the precast foundation formwork 20a extends in the orthogonal direction Y. The first outer wall 21, the first inner wall 22, the first bottom wall 23, the outer inclined portion 24, and the inner inclined portion 25 of the precast foundation formwork 20a are integrally formed of concrete or the like. The precast foundation formwork 20a preferably has a mounting fitting (not shown). For example, the mounting fitting is attached to the surface of the first outer wall 21 facing the second side X2.

[0020] The plurality of foundation formworks 20 are arranged side by side at positions other than the positions corresponding to the main columns 10 in the orthogonal direction Y. That is, the main columns 10 are arranged in a region that does not overlap with the arrangement region of the plurality of foundation formworks 20 in the orthogonal direction Y. In other words, the plurality of foundation formworks 20 are arranged avoiding the main columns 10 in the orthogonal direction Y. The first outer walls 21 of two adjacent precast foundation formworks 20a in the orthogonal direction Y are arranged side by side in the orthogonal direction Y. The same applies to the first inner wall 22 and the first bottom wall 23 as the first outer wall 21. Two adjacent precast foundation formworks 20a in the orthogonal direction Y are connected, for example, by fixing their respective mounting fittings to each other with bolts and nuts (not shown). As shown in FIG. 2, the plurality of precast foundation formworks 20a are arranged on the bedding mortar 102. In the precast foundation formwork 20a, the first outer wall 21 is arranged in the outer portion of the depression G2. On the other hand, the first inner wall 22 is arranged in the inner portion of the depression G2.

[0021] As shown in FIG. 1, the connecting formwork 30 has a second outer wall (third wall) 31. The second outer wall 31 is configured similarly to the first outer wall 21 of the precast foundation formwork 20a. That is, the second outer wall 31 is formed in a flat plate shape that has a rectangular shape when viewed in the thickness direction of the second outer wall 31. The second outer wall 31 extends in the vertical direction and the orthogonal direction Y. The connecting formwork 30 is disposed between two foundation formworks 20 adjacent to each other in the orthogonal direction Y. In the orthogonal direction Y, the connecting formwork 30 is disposed in the range where the main columns 10 are disposed, and the foundation formwork 20 is not disposed. The main columns 10 are disposed at positions corresponding to the connecting formwork 30 in the opposing direction X. The main columns 10 are shifted (displaced) with respect to the multiple foundation formworks 20 in the orthogonal direction Y.

[0022] The first outer wall 21 of the two precast foundation formworks 20a adjacent to each other in the orthogonal direction Y and the second outer wall 31 of the connecting formwork 30 are arranged at corresponding positions in the opposing direction X. That is, the first outer wall 21 and the second outer wall 31 are arranged side by side in the orthogonal direction Y. The upper ends of the first outer wall 21 and the second outer wall 31 are arranged at the same height. It is preferable that the precast foundation formworks 20a and the connecting formworks 30 adjacent to each other in the orthogonal direction Y are connected to each other in the same way as the two precast foundation formworks 20a adjacent to each other in the orthogonal direction Y.

[0023] In the range where the connecting formwork 30 is arranged in the orthogonal direction Y, a non-existence region R1 where the inner wall and the bottom wall are not arranged is formed. Note that the connecting formwork may have a second bottom wall connected to the lower end of the second outer wall 31.

[0024] As shown in Figs. 1 and 2, for example, the beam 35 is made of an H-shaped steel. That is, the beam 35 has a pair of flanges 36, 37 and a web 38 joined to the flanges 36, 37, respectively. In the beam 35, the flange 36 is arranged above the flange 37. The beam 35 extends in the orthogonal direction Y along a horizontal plane.

[0025] As shown in FIG. 2, the beam 35 is disposed between the first outer wall 21 and the first inner wall 22 in the opposite direction X. The beam 35 is disposed above the first bottom wall 23. The upper end (the upper surface of the flange 36) of the beam 35 is disposed above the upper end of the first inner wall 22. The lower end (the lower surface of the flange 37) of the beam 35 is disposed above the upper end of the first inner wall 22. That is, in the present embodiment, the entire beam 35 is disposed above the upper end of the first inner wall 22. The beam 35 is separated from the first outer wall 21, the first inner wall 22, and the first bottom wall 23, respectively. The beam 35 is disposed below the upper end of the first outer wall 21.

[0026] As shown in FIG. 3, a gusset plate 39 is fixed to the middle portion of the web 38 and the like of the beam 35 in the orthogonal direction Y by welding or the like. As shown in FIG. 1, in the orthogonal direction Y, the end 35a of the beam 35 is disposed within the range where the connecting formwork 30 is disposed. That is, in the orthogonal direction Y, the end 35a of the beam 35 protrudes beyond the end of the foundation formwork 20. The web 38 at the end 35a of the beam 35 and the gusset plate 39 of the main column 10 are connected to each other by bolts and nuts (not shown). As described above, the main column 10 is connected to the end 35a of the beam 35 via a gusset plate, bolts, and nuts. The beam 35 is a steel beam embedded in the ground G (a steel beam made of steel).

[0027] As shown in FIGS. 1 and 3, for example, the intermediate column 45 is composed of an H-shaped steel. That is, the intermediate column 45 has a pair of flanges 46, 47 and webs 48 joined to the flanges 46, 47, respectively. The intermediate column 45 extends in the vertical direction. In the intermediate column 45, the flange 46 is disposed on the first side X1 with respect to the flange 47. As shown in FIG. 3, the lower end portion of the intermediate column 45 is fixed to the gusset plate 39 of the beam 35 by bolts 49 and nuts (not shown). That is, the intermediate column 45 is connected to the middle portion of the beam 35 in the orthogonal direction Y. A gusset plate 50 is fixed to the flange 46 of the intermediate column 45 by welding or the like. The gusset plate 50 protrudes from the flange 46 toward the first side X1.

[0028] As shown in FIG. 1, the position of the end of the first side X1 of the intermediate column 45 (the surface of the flange 46 facing the first side X1) and the position of the end of the first side X1 of the main column 10 (the surface of the flange 11 facing the first side X1) coincide in the opposing direction X.

[0029] As shown in FIGS. 2 and 3, a body edge 55 is attached to the gusset plate 14 fixed to the main column 10 and the gusset plate 50 fixed to the intermediate column 45. The body edge 55 extends in the orthogonal direction Y. For example, the body edge 55 is attached to the gusset plates 14, 50 by bolts 56 and nuts 57. The position of the end of the first side X1 of the body edge 55 and the position of the end of the second side X2 of the first outer wall 21 of the precast foundation formwork 20a may coincide in the opposing direction X.

[0030] The outer wall 60 is formed in a flat plate shape. The outer wall 60 is arranged such that the thickness direction of the outer wall 60 is along the opposing direction X. The outer wall 60 is fixed to the body edge 55 by bolts or the like (not shown). The outer wall 60 is arranged above the first outer wall 21 of the precast foundation formwork 20a. The outer wall 60 and the first outer wall 21 are connected to each other by a drain 61.

[0031] As shown in FIGS. 1 and 2, concrete 65 is placed (arranged) in the precast foundation formwork 20a and on the crushed stone 104. The upper surface of the concrete 65 is above the upper end of the first inner wall 22 of the precast foundation formwork 20a, above the upper end of the beam 35, and below the upper end of the first outer wall 21. The upper end of the first outer wall 21 is disposed above the ground level GL which is the upper surface of the outer ground G1. The upper end of the first inner wall 22 is disposed below the ground level GL. The floor level FL which is the upper surface of the concrete 65 is disposed above the ground level GL and the upper end of the first inner wall 22 respectively, and is disposed below the upper end of the first outer wall 21.

[0032] Next, a construction method of the foundation formwork system (hereinafter simply referred to as the construction method), in which the foundation formwork system 1 configured as described above is constructed, will be described. FIG. 4 is a flowchart showing the construction method S1. In advance, corresponding to the outer shape of the building, the ground G is excavated to the height of the upper surface of the inner ground G3 to form a recess in the ground G. The outer peripheral edge of the recess is further excavated to form a depression G2. Among the recess, the portion surrounded by the depression G2 becomes the inner ground G3. Among the ground G, the portion that is not excavated becomes the outer ground G1. A plurality of main column foundations 100 are embedded in the depression G2, and the bedding mortar 102 is disposed. The crushed stones 104 are disposed on the inner ground G3. The crushed stones 104 are constructed by rolling compaction.

[0033] First, in the formwork arrangement step S6 (step S6 shown in FIG. 4), a plurality of foundation formworks 20 and connection formworks 30 are arranged in the depression G2 of the ground G. For example, a plurality of foundation formworks 20, connection formworks 30, a plurality of main columns 10, intermediate columns 45, outer walls 60, etc. are suspended and arranged by a crane (not shown). A plurality of foundation formworks 20 and connection formworks 30 are appropriately connected using mounting fittings or the like. When the formwork arrangement step S6 is completed, the process proceeds to step S8.

[0034] Next, in the main column arrangement step (first column arrangement step) S8, the main column 10 is arranged. Specifically, the lower end portion of the main column 10 is fixed to the main column foundation 100, and the main column 10 is arranged to extend in the vertical direction. The main column arrangement step S8 is a step performed before the beam arrangement step S10 described later. When the main column arrangement step S8 ends, the process proceeds to step S10.

[0035] Next, in the beam arrangement step S10, a beam 35 is arranged between the first outer wall 21 and the first inner wall 22 in the opposite direction X and above the first bottom wall 23. The beam 35 is arranged such that the upper end of the beam 35 is located above the upper end of the first inner wall 22. An end 35a of the beam 35 in the beam 35 is connected to the main column 10. When the beam arrangement step S10 ends, the process proceeds to step S12.

[0036] Next, in the intermediate column arrangement step S12, an intermediate column 45 is arranged. Specifically, the lower end portion of the intermediate column 45 is fixed to the beam 35, and the intermediate column 45 is arranged to extend in the vertical direction. When the intermediate column arrangement step S12 ends, the remaining work such as fixing the outer wall 60 to the plurality of main columns 10 and intermediate columns 45 is appropriately performed. Since the upper ends of the first outer wall 21 and the second outer wall 31 are arranged at the same height as each other, the outer wall 60 can be easily arranged above the first outer wall 21 and the second outer wall 31. By performing the above steps, all steps of the construction method S1 are completed, and the foundation formwork system 1 is constructed.

[0037] As described above, generally, a beam is moved downward from above the side wall and arranged in the foundation formwork. In the foundation formwork system 1 of the present embodiment, the upper end of the beam 35 is arranged above the upper end of the first inner wall 22. Therefore, compared with the case where the upper end of the beam is arranged below the upper end of the inner wall as in Patent Document 1, the distance for moving the beam 35 downward can be reduced, and the beam 35 can be easily arranged in the plurality of foundation formworks 20. And the workability at the construction site for constructing the foundation formwork system 1 is excellent. Also, when the basic formwork system 1 is viewed from the side of the first inner wall 22 (towards the first side X1) along the opposing direction X, at least a part of the upper portion of the beam 35 protrudes above the first inner wall 22. As a result, compared to the case where the upper end of the beam 35 is at the same height as the upper end of the first inner wall 22 or is disposed below the upper end of the first inner wall 22, the intermediate column 45 can be easily connected to the middle portion of the beam 35 in the orthogonal direction Y.

[0038] The lower end of the beam 35 is disposed above the upper end of the first inner wall 22. Therefore, the beam 35 can be easily lifted by a crane or the like and moved from the side of the first inner wall 22, along the opposing direction X, above the first inner wall 22 and above the first bottom wall 23. And the construction period of the basic formwork system 1 can be shortened. In the orthogonal direction Y, the end 35a of the beam 35 protrudes beyond the end of the basic formwork 20. As a result, the end 35a of the beam 35 can be easily connected to the main column 10.

[0039] The basic formwork system 1 includes a plurality of main columns 10. Therefore, the end 35a of the beam 35 can be supported by the plurality of main columns 10. The main column 10 is disposed in a region that does not overlap with the arrangement regions of the plurality of basic formworks 20 in the orthogonal direction Y. Thus, even when connecting the lower end portion of the main column 10 to the main column foundation 100, it is possible to suppress the plurality of basic formworks 20 from interfering with the construction of the main column 10.

[0040] The connecting formwork 30 is disposed at a position corresponding to the first outer wall 21 in the opposing direction X. Therefore, even when placing the concrete 65 on the second side X2 with respect to the plurality of basic formworks 20 and the connecting formwork 30, it is possible to suppress the concrete 65 from overflowing to the first side X1 beyond the first outer wall 21 of the plurality of basic formworks 20 and the connecting formwork 30. The positions of the ends of the first side X1 of the intermediate column 45 and the positions of the ends of the first side X1 of the main column 10 coincide in the opposing direction X. As a result, the outer wall 60 can be easily attached to the ends of the first side X1 of the intermediate column 45 and the ends of the first side X1 of the main column 10, where the positions in the opposing direction X coincide.

[0041] The precast foundation formwork 20a has an outer inclined portion 24. Therefore, for example, with respect to an external force acting on the first outer wall 21 along the opposing direction X, it is possible to make the first outer wall 21 difficult to deform. The precast foundation formwork 20a has an inner inclined portion 25. Therefore, for example, with respect to an external force acting on the first inner wall 22 along the opposing direction X, it is possible to make the first inner wall 22 difficult to deform.

[0042] Also, in the construction method S1 of the present embodiment, in the formwork arrangement step S6, a plurality of foundation formworks 20 can be arranged on the ground G. And in the beam arrangement step S10, the upper end of the beam 35 is arranged above the upper end of the first inner wall 22. For this reason, compared with the case where the upper end of the beam is arranged below the upper end of the inner wall as in Patent Document 1, the distance for moving the beam 35 downward can be reduced, and the beam 35 can be easily arranged on a plurality of foundation formworks 20. Also, when the foundation formwork system 1 is viewed from the side of the first inner wall 22 along the opposing direction X, at least a part of the upper portion of the beam 35 protrudes above the first inner wall 22. As a result, compared with the case where the upper end of the beam 35 is arranged at the same height as the upper end of the first inner wall 22 or below the upper end of the first inner wall 22, the intermediate column 45 can be easily connected to the middle portion in the orthogonal direction Y of the beam 35.

[0043] In the construction method S1, the main column arrangement step S8 is performed before the beam arrangement step S10, and in the beam arrangement step S10, the end 35a of the beam 35 is connected to the main column 10. As a result, by connecting the end 35a of the beam 35 in the beam arrangement step S10 to the main column 10 arranged in the main column arrangement step S8, the beam 35 can be supported by the main column 10.

[0044] As described above in detail with reference to the drawings for one embodiment of the present disclosure, the specific configuration is not limited to this embodiment, and includes configuration changes, combinations, deletions, etc. within the scope not departing from the gist of the present disclosure.

[0045] (First Modification Example) For example, in the basic formwork system 1 shown in FIG. 5, the first outer wall 21 of the basic formwork 20 etc. is shown without being broken in the vertical direction. Above the outer wall 60, a window frame 70 is fixed, and a window 72 is attached to this window frame 70. The outer wall 60, the window frame 70, and the window 72 are separate from each other. The window 72 is configured by attaching a frame 74 to the outer peripheral edge of the glass 73. The frame 74 is fitted to the window frame 70.

[0046] The upper end of the first outer wall 21 is arranged above the floor level FL which is the upper surface of the concrete 65. The portion of the first outer wall 21 above the ground level GL functions as a waist wall 21a. For example, the vertical length of the first outer wall 21 is three times or more the vertical length of the first inner wall 22. The waist wall 21a rises up to the position of the waist of a user standing on the floor level FL. The basic formwork system 1 functions as the foundation of a building. In the basic formwork system 1, the waist wall 21a and the foundation portion are integrally formed. Therefore, a building can be constructed at low cost and in a short construction period. By constructing the basic formwork system 1 having the waist wall 21a, exterior work for constructing the outer wall 60 etc. can be started early.

[0047] In the above embodiment and modification example, the lower end of the beam 35 may be at the same height as the upper end of the first inner wall 22 or may be arranged below the upper end of the first inner wall 22. In the orthogonal direction Y, the end 35a of the beam 35 may not protrude beyond the end of the basic formwork 20.

[0048] The position of the end on the first side X1 of the intermediate column 45 and the position of the end on the first side X1 of the main column 10 may not coincide in the opposing direction X. The precast basic formwork 20a may not have at least one of the outer inclined portion 24 and the inner inclined portion 25. The upper end of the first outer wall 21 may be arranged at the same height as the upper end of the first inner wall 22, or may be arranged below the upper end of the first inner wall 22. The basic formwork system 1 may not include at least one of the plurality of main columns 10, the connecting formwork 30, the intermediate columns 45, the barrel edge 55, and the outer wall 60. In the construction method S1, at least one of the main column arrangement step S8 and the intermediate column arrangement step S12 may not be performed.

[0049] (Supplementary Note) (1) Aspect 1 of the present disclosure includes a basic formwork having a first wall, a second wall arranged opposite to the first wall, and a bottom wall respectively connected to the lower end of the first wall and the lower end of the second wall, and a beam arranged between the first wall and the second wall in the facing direction which is the direction in which the first wall and the second wall face each other, and the upper end of the beam is arranged above the upper end of the second wall.

[0050] Generally, the beam is moved downward from above the side wall and arranged inside the basic formwork. In this disclosure, the upper end of the beam is arranged above the upper end of the second wall. Therefore, compared with the case where the upper end of the beam is arranged below the upper end of the second wall as in Patent Document 1, the distance for moving the beam downward is less, and the beam can be easily arranged in the basic formwork. Also, when the basic formwork system is viewed from the second wall side, at least a part of the upper part of the beam protrudes above the second wall. Thereby, compared with the case where the upper end of the beam is arranged at the same height as the upper end of the second wall or below the upper end thereof, for example, the second column which is an intermediate column can be easily connected to the middle part in the longitudinal direction of the beam. And the workability at the construction site for constructing the basic formwork system is excellent.

[0051] (2) Aspect 2 of the present disclosure may be the basic formwork system according to (1), wherein the lower end of the beam is arranged above the upper end of the second wall. In this disclosure, when the basic formwork system is viewed from the second wall side, the entire beam protrudes above the second wall. Therefore, for example, the beam can be easily lifted by a crane or the like and moved upward from the second wall side, beyond the second wall, and above the bottom wall.

[0052] (3)Aspect 3 of this disclosure may be the basic formwork system according to (1) or (2), wherein, in the longitudinal direction of the beam, the ends of the beam protrude beyond the ends of the basic formwork. In this disclosure, for example, the first column, which is a main column, can be easily connected to the end of the beam.

[0053] (4)Aspect 4 of this disclosure may be the basic formwork system according to (3), which includes a first column connected to the end of the beam. In this disclosure, the end of the beam can be supported by the first column.

[0054] (5)Aspect 5 of this disclosure may be the basic formwork system according to (4), wherein the first column is arranged in a region that does not overlap with the arrangement region of the basic formwork in the longitudinal direction. In this disclosure, for example, even when connecting the lower end of the first column to the foundation for the main column, it is possible to prevent the basic formwork from interfering with the construction of the first column.

[0055] (6)Aspect 6 of this disclosure may be the basic formwork system according to (4) or (5), which includes a connecting formwork arranged between adjacent basic formworks, and the connecting formwork is arranged at a position corresponding to the first wall in the facing direction. In this disclosure, for example, even when placing concrete on one side in the facing direction with respect to the basic formwork and the connecting formwork, it is possible to prevent the concrete from overflowing to the other side in the facing direction beyond the first wall of the basic formwork and the connecting formwork. And the placement of concrete can be easily carried out.

[0056] (7)Aspect 7 of the present disclosure includes a second column connected to the longitudinal middle part of the beam. When, among the opposing directions, the side of the first wall with respect to the second wall is defined as the first side, the position of the end of the second column on the first side and the position of the end of the first column on the first side coincide in the opposing direction. It may be the basic formwork system described in (5) or (6). In this disclosure, for example, the outer wall can be easily attached to the end of the second column on the first side and the end of the first column on the first side where the positions in the opposing direction coincide.

[0057] (8)Aspect 8 of the present disclosure is such that the basic formwork has a first inclined portion where the inner surface of the connection portion between the first wall and the bottom wall gradually inclines closer to the second wall as it goes downward. It may be the basic formwork system described in any one of (1) to (7). In this disclosure, for example, with respect to the external force acting on the first wall along the opposing direction, the first wall can be made difficult to deform.

[0058] (9)Aspect 9 of the present disclosure is such that the basic formwork has a second inclined portion where the inner surface of the connection portion between the second wall and the bottom wall gradually inclines closer to the first wall as it goes downward. It may be the basic formwork system described in any one of (1) to (8). In this disclosure, for example, with respect to the external force acting on the second wall along the opposing direction, the second wall can be made difficult to deform.

[0059] (10)Aspect 10 of the present disclosure is a construction method of a basic formwork system that includes a formwork placement step of placing a basic formwork having a first wall, a second wall disposed opposite to the first wall, and a bottom wall respectively connected to the lower end portions of the first wall and the second wall on the ground, and a beam placement step of placing a beam between the first wall and the second wall in an opposing direction which is the direction in which the first wall and the second wall oppose each other. In the beam placement step, the upper end of the beam is disposed above the upper end of the second wall.

[0060] In this disclosure, in the formwork placement step, the foundation formwork can be placed on the ground. Generally, the beam is moved downward from above the side wall and placed inside the foundation formwork. In the beam placement step, the upper end of the beam is placed above the upper end of the second wall. Therefore, compared with the case where the upper end of the beam is placed below the upper end of the second wall as in Patent Document 1, the distance for moving the beam downward can be reduced, and the beam can be easily placed in the foundation formwork. Also, when the foundation formwork system is viewed from the second wall side, at least a part of the upper portion of the beam protrudes above the second wall. Thereby, compared with the case where the upper end of the beam is at the same height as the upper end of the second wall or is placed below the upper end of the second wall, for example, the second column which is an intermediate column can be easily connected to the middle portion in the longitudinal direction of the beam. And the workability at the construction site for constructing the foundation formwork system is excellent.

[0061] (11)Aspect 11 of this disclosure may be a construction method of the foundation formwork system according to (10), which performs a first column placement step of placing a first column before the beam placement step, and in the beam placement step, connects an end in the longitudinal direction of the beam to the first column. In this disclosure, by connecting the end in the longitudinal direction of the beam to the first column placed in the first column placement step, the beam can be supported by the first column.

Explanation of Signs

[0062] 1 Foundation formwork system 10 Main column (first column) 20 Foundation formwork 21 First outer wall (first wall) 22 First inner wall (second wall) 23 First bottom wall (bottom wall) 24 Outer inclined portion (first inclined portion) 24a, 25a Inner surface 25 Inner inclined portion (second inclined portion) 30 Connecting formwork 35 Beam 35a End 45 intermediate columns (second columns) G ground S1 construction method (construction method of foundation formwork system) S6 formwork arrangement step S8 main column arrangement step (first column arrangement step) S10 beam arrangement step X opposite direction X1 first side Y orthogonal direction (longitudinal direction)

Claims

1. a foundation formwork having a first wall, a second wall disposed opposite the first wall, and a bottom wall connected to a lower end of the first wall and a lower end of the second wall, a beam disposed between the first wall and the second wall in a facing direction in which the first wall and the second wall face each other; Equipped with A foundation formwork system, wherein an upper end of the beam is positioned above an upper end of the second wall.

2. The foundation formwork system of claim 1 , wherein the lower end of the beam is positioned above the upper end of the second wall.

3. The foundation formwork system according to claim 1 , wherein in the longitudinal direction of the beam, the end of the beam protrudes beyond the end of the foundation formwork.

4. The foundation formwork system of claim 3 further comprising a first column connected to said end of said beam.

5. The foundation formwork system according to claim 4 , wherein the first column is arranged in an area that does not overlap with the arrangement area of ​​the foundation formwork in the longitudinal direction.

6. A connecting formwork is provided between adjacent foundation formworks, The foundation formwork system according to claim 5 , wherein the connecting formwork is arranged at a position corresponding to the first wall in the opposing direction.

7. a second pillar connected to an intermediate portion of the beam in the longitudinal direction; When the first wall side with respect to the second wall in the opposing direction is defined as a first side, The foundation formwork system according to claim 5 or 6, wherein the position of the end of the first side of the second column and the position of the end of the first side of the first column coincide in the opposing direction.

8. The foundation formwork system of claim 1 , wherein the inner surface of the connection between the first wall and the bottom wall has a first inclined portion that gradually approaches the second wall as it extends downward.

9. The foundation formwork system according to claim 1 , wherein the inner surface of the connection between the second wall and the bottom wall has a second inclined portion that gradually approaches the first wall as it extends downward.

10. a formwork placement step of placing a foundation formwork on the ground, the foundation formwork having a first wall, a second wall disposed opposite to the first wall, and a bottom wall connected to a lower end of the first wall and a lower end of the second wall, respectively; a beam disposing step of disposing a beam between the first wall and the second wall in an opposing direction in which the first wall and the second wall oppose each other; Do the following: A construction method for a foundation formwork system, wherein in the beam placing step, the beam is placed so that an upper end of the beam is positioned above an upper end of the second wall.

11. A first pillar arranging step of arranging a first pillar is performed before the beam arranging step; The construction method for a foundation formwork system according to claim 10 , wherein in the beam arranging step, a longitudinal end of the beam is connected to the first column.

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