Form for forming foundation

Abstract

To provide a form for forming a foundation, which can bear lateral pressure during concrete placement and which can prevent positional deviation of a circular form.SOLUTION: A form for forming a foundation comprises a circular form 10 that is formed of a plate surface of a curved thin plate material 11, and a plurality of form installation members 20 that are mounted on the circular form 10 so as to install the circular form 10 on an installation surface. Each of the plurality of form installation members 20 is thicker than the plate material 11. The plurality of form installation members 20 have a form-side fixing part 21 that is fixed to the circular form 10, and an installation surface-side fixing part 22 that is fixed to the installation surface 140. The form-side fixing part 21 and the installation surface-side fixing part 22 extend in an approximately vertical direction. A part between the form-side fixing part 21 and the circular form 10 and a part between the installation surface-side fixing part 22 and the installation surface 140 are fixed by different means.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a formwork for foundation formation. [Background technology]

[0002] Generally, when constructing a concrete foundation, a flat formwork is erected and concrete is poured into it. At this time, the formwork is reinforced with reinforcing materials to prevent deformation (bulging out) due to the lateral pressure of the concrete. This has led to problems with construction work and time.

[0003] Therefore, a method is known in which a strip of plate material is bent into a circle to form a circular formwork, and concrete is poured into the formwork to build a concrete foundation, as in Patent Document 1. This method has the advantage that by using a circular formwork, the lateral pressure of the concrete can be converted into tensile force in the circumferential direction of the circular formwork, so that while the formwork is made of thin plate material, no special reinforcement is required for the formwork. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 4-203024 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when pouring concrete, the circular formwork sometimes becomes misaligned or distorted.

[0006] The present disclosure has been made in consideration of such problems, and aims to provide a formwork for foundation formation that can withstand lateral pressure when pouring concrete and prevent the circular formwork from shifting out of position. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes the following means. One aspect of the present disclosure provides a formwork for foundation formation, comprising: a circular formwork formed from curved, thin sheet metal surfaces; and a plurality of formwork mounting members attached to the circular formwork and mounting the circular formwork to an installation surface, wherein the thickness of each of the plurality of formwork mounting members is greater than the thickness of the sheet metal, and the plurality of formwork mounting members comprise a formwork-side fixing portion fixed to the circular formwork and an installation surface-side fixing portion fixed to the installation surface, the formwork-side fixing portion and the installation surface-side fixing portion extending in a substantially perpendicular direction, and the formwork-side fixing portion is fixed between the formwork-side fixing portion and the circular formwork by a means different from that between the installation surface-side fixing portion and the installation surface. [Effects of the Invention]

[0008] The present disclosure provides a formwork for foundation formation that can withstand lateral pressure during concrete pouring and prevent the circular formwork from shifting out of position. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view of a formwork for forming a foundation according to the present embodiment. [Figure 2] A side view of the foundation formation formwork installed on the installation surface. [Figure 3] FIG. 2 is a plan view of the formwork for forming a foundation in this embodiment. [Figure 4] FIG. 4 is a view taken in the direction of the arrow A in FIG. 3. [Figure 5] FIG. 2 is an enlarged view of a formwork mounting member in this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of a formwork for foundation formation 1 according to the present disclosure will be described with reference to the drawings. Fig. 1 shows a perspective view of the formwork for foundation formation 1 in this embodiment.

[0011] The foundation formation formwork 1 is a formwork 1 for use in forming a foundation concrete. As shown in Fig. 1, reinforcing bars 110 and anchor bolts 120 are arranged inside the foundation formation formwork 1. Note that upper end reinforcements (not shown) may be provided above the reinforcing bars 110.

[0012] In this embodiment, four anchor bolts 120 are provided symmetrically about the central axis O1 of the circular formwork 10. The arrangement and number of anchor bolts 120 are not particularly limited.

[0013] There are no particular limitations on the arrangement and configuration of the reinforcing bars 110. The arrangement and configuration of the reinforcing bars 110 can be set appropriately depending on, for example, the size of the foundation concrete.

[0014] Figure 2 shows the foundation formation formwork 1 installed on an installation surface 140. As shown in Figure 2, the circular formwork 10 is installed on the installation surface 140 at the excavation section 130 of the ground G1. The circular formwork 10 is fixed by formwork installation members 20. A basing concrete layer may be formed on the installation surface 140. By pouring concrete C into the foundation forming formwork 1 thus installed, the foundation concrete is constructed.

[0015] 3 shows a plan view of the foundation formation formwork 1. As shown in FIG. 3, the foundation formation formwork 1 has a circular formwork 10 and a formwork installation member 20.

[0016] The circular formwork 10 is constructed by bending plate materials 11 and connecting them at connecting portions 12. The connecting portions 12 are provided at both ends of the plate materials 11. Specifically, the circular formwork 10 is formed by overlapping the connection portions 12 of the plate materials 11 and fixing them with fixing portions 13 (bolts in this embodiment). The method of connecting the plate materials 11 (fixing portions 13) is not limited to bolts, and may be, for example, by overlapping the connection portions 12 of the plate materials 11 to be connected and fixing them by welding (for example, spot welding, etc.). In this embodiment, five fixing portions 13 are provided per connecting portion 12 (see FIG. 1, etc.). The number of fixing portions 13 per connecting portion 12 is not limited.

[0017] In this embodiment, three plates 11 are connected. The number of plates 11 is not limited to three, and may be one, two, or four or more.

[0018] The plate material 11 is strip-shaped. The longitudinal length of the plate material 11 is the circumferential length of the circular formwork 10. Hereinafter, the longitudinal length of the plate material 11 will be referred to as the circumferential length. In this embodiment, only one of the multiple plate materials 11 has a different circumferential length, while the other plate materials 11 have the same circumferential length. Specifically, the circular formwork 10 in this embodiment is made up of plate materials 11 with two different circumferential lengths, that is, two plate materials 11a (longer circumferential length) and one plate material 11b (shorter circumferential length). However, the combination of the numbers of plate materials 11a and plate materials 11b is not limited to this.

[0019] The circumferential lengths and combinations of the plate materials 11 used in the circular formwork 10 are not limited to those described above. The circumferential lengths of the plate materials 11 used in the circular formwork 10 may all be the same or may all be different. For example, multiple types of plate materials 11 with different circumferential lengths may be prepared, and by changing the number and types of plate materials 11 to be combined, a circular formwork 10 may be formed to match the size of the foundation concrete to be constructed.

[0020] In this embodiment, the plate material 11 is a steel plate, but the material of the plate material 11 is not limited to a steel plate.

[0021] FIG. 4 shows a view taken in the direction of the arrow A in FIG. The length of the plate material 11 in the short side direction (the height of the circular formwork 10) is not limited. The thickness T2 of the plate material 11 is not limited to a specific thickness as long as it is thinner than the thickness T1 of the formwork installation member 20 (see FIG. 5).

[0022] The formwork mounting member 20 is used to fix the circular formwork 10. As shown in Fig. 3, it is preferable that the mounting surface side fixing portion 22 (described later) of the formwork mounting member 20 extends in the direction of radius r of the circle formed by the circular formwork 10 in a plan view. In this embodiment, the circular formwork 10 is fixed by four formwork mounting members 20 arranged at equal intervals. The number of formwork mounting members 20 used to fix the circular formwork 10 is not limited to four, and may be one, two, three, or five or more. When a plurality of formwork mounting members 20 are used to fix the circular formwork 10, it is preferable that the formwork mounting members 20 are arranged spaced apart from one another in the circumferential direction. In this case, the formwork mounting members 20 may be arranged at equal intervals or at uneven intervals.

[0023] FIG. 5 shows an enlarged view of the formwork mounting member 20 connected to the circular formwork 10 and the mounting surface 140. 5, the formwork installation member 20 in this embodiment is an L-shaped metal fitting. However, the shape and material of the formwork installation member 20 are not limited. When the formwork mounting member 20 is connected to the circular formwork 10 and the installation surface 140, the side that contacts the circular formwork 10 is referred to as the formwork-side fixing portion 21, and the side that contacts the installation surface 140 is referred to as the installation surface-side fixing portion 22. The formwork-side fixing portion 21 and the installation surface-side fixing portion 22 extend in a substantially perpendicular direction. Here, "substantially perpendicular" does not necessarily mean that the angle α between the formwork-side fixing portion 21 and the installation surface-side fixing portion 22 in a side view of the formwork mounting member 20 is 90 degrees. For example, the angle α may differ from 90 degrees by 10 degrees, or the angle α may be 80 degrees or greater and 100 degrees or less. The ratio of the length L1 of the formwork-side fixing portion 21 in the extension direction to the length L2 of the installation surface-side fixing portion 22 in the extension direction may be in the range of 1:1.5 to 1:2.0. The length L1 may be shorter than the length L2, i.e., 1.5≦(L2 / L1)≦2.0. In this embodiment, the formwork-side fixing part 21 is integrally attached to the outside of the circular formwork 10, and the installation surface-side fixing part 22 extends outward from the circular formwork 10. Note that the formwork-side fixing part 21 may also be integrally attached to the inside of the circular formwork 10, and the installation surface-side fixing part 22 may also extend inward from the circular formwork 10. Here, being integrally attached means that the circular formwork 10 and the formwork-side fixing part 21 are fixed in surface contact with each other.

[0024] In this embodiment, the installation surface side fixing portion 22 is fixed to the installation surface 140 at two locations, and the formwork side fixing portion 21 is fixed to the circular formwork 10 at one location. The installation surface side fixing portion 22 may be fixed to the installation portion at one location or at multiple locations. The formwork side fixing portion 21 may be fixed to the circular formwork 10 at one location or at multiple locations.

[0025] For example, the installation surface side fixing portion 22 may be fixed to the installation surface 140 at one location, and the formwork side fixing portion 21 may be fixed to the circular formwork 10 at two or more locations. The installation surface side fixing portion 22 may be fixed to the installation surface 140 at one location, and the formwork side fixing portion 21 may be fixed to the circular formwork 10 at one location. The installation surface side fixing portion 22 may be fixed to the installation surface 140 at two or more locations, and the formwork side fixing portion 21 may be fixed to the circular formwork 10 at two or more locations.

[0026] The method of fixing the formwork mounting member 20 is not limited. In this embodiment, the installation surface side fixing portion 22 is fixed to the installation surface 140 with nails (concrete nails), and the formwork side fixing portion 21 is fixed to the circular formwork 10 with bolts. The formwork side fixing portion 21 may be fixed to the circular formwork 10 by spot welding. When nails or bolts are used for fixing, the number of nails or bolts used can be the number of fixing points. When spot welding is used for fixing, the number of spot welds can be the number of fixing points.

[0027] The width of the formwork mounting member 20 is not limited. The thickness T1 of the formwork installation member 20 is only required to be thicker than the thickness T2 of the plate material 11, and there are no specific limitations on the thickness. The thickness T1 of the formwork mounting member 20 is preferably a thickness that allows the circular formwork 10 to stand on its own, for example. The thickness T1 of the formwork mounting member 20 is preferably a thickness that stabilizes the shape of the circular formwork 10, for example. When multiple formwork mounting members 20 are used to secure the circular formwork 10, it is preferable that the thicknesses T1 of the multiple formwork mounting members 20 are the same. However, the thicknesses T1 of the multiple formwork mounting members 20 may be different.

[0028] The thickness of the formwork mounting member 20 is preferably at least three times the thickness of the plate material 11. If the thickness of the formwork mounting member 20 is at least three times the thickness of the plate material 11, the circular formwork 10 can be made to stand on its own and its shape can be stabilized. From the standpoint of the weight and cost of the formwork mounting member 20, the thickness T1 of the formwork mounting member 20 is preferably no more than eight times the thickness T2 of the plate material 11.

[0029] By pouring concrete C into the above-described formwork 1 for forming a foundation, a concrete foundation is constructed. At this time, the circular form 10 receives uniform force from the concrete C being poured around the circular form 10 in accordance with the height, and is thereby formed into a circular shape in a plan view.

[0030] As described above, the foundation formation formwork 1 of this embodiment comprises a circular formwork 10 formed from the surface of a curved, thin plate material 11, and a plurality of formwork mounting members 20 attached to the circular formwork 10 to mount the circular formwork 10 on an installation surface 140, and the thickness T1 of each of the plurality of formwork mounting members 20 is thicker than the thickness T2 of the plate material 11. By using such a formwork mounting member 20, the circular formwork 10 made of thin plate material 11 can be made to stand on its own, and can withstand the lateral pressure when pouring concrete C and prevent the circular formwork 10 from shifting out of position.

[0031] Furthermore, the thickness T1 of the multiple formwork mounting members 20 may be the same. If the thickness T1 of the multiple formwork mounting members 20 is the same, the lateral pressure of the concrete C can be evenly distributed when the concrete C is poured inside the foundation forming formwork 1. Therefore, the lateral pressure when the concrete C is poured can be withstood and the circular formwork 10 can be prevented from shifting in position.

[0032] Furthermore, the circular formwork 10 may be formed into a circular shape in a plan view by receiving uniform force from the concrete C to be poured around the circular formwork 10 in accordance with the height. As a result, even if the plates 11 that make up the circular formwork 10 are thin, the circular formwork 10 can maintain its perfect circular shape by receiving an even force around the periphery of the circular formwork 10. This makes it possible to withstand the lateral pressure when pouring the concrete C and prevent the circular formwork 10 from shifting out of position.

[0033] The multiple formwork mounting members 20 have formwork side fixing portions 21 fixed to the circular formwork 10 and installation surface side fixing portions 22 fixed to the installation surface 140, and the formwork side fixing portions 21 and the installation surface side fixing portions 22 may extend in an approximately vertical direction. This allows the plate materials 11 of the circular formwork 10 to be installed approximately perpendicular to the installation surface 140. Therefore, the lateral pressure when pouring the concrete C can be evenly distributed to the plate materials 11, making it possible to withstand the lateral pressure when pouring the concrete C and prevent the circular formwork 10 from shifting position.

[0034] Moreover, the formwork-side fixing portion 21 may be attached to the outside of the circular formwork 10. The installation surface side fixing portion 22 may also extend outward from the circular formwork 10. This is preferable because it prevents the formwork installation member 20 from interfering with the foundation concrete when the concrete C is poured.

[0035] Furthermore, the installation surface side fixing portion 22 may extend in the direction of the radius r of the circle formed by the circular formwork 10 in plan view. When concrete C is poured into the circular formwork 10, lateral pressure is applied in a direction from the central axis O1 toward the side. Therefore, by installing the installation surface side fixing part 22 so that it extends in the direction of the radius r of the circle formed by the circular formwork 10 in a plan view, it is possible to withstand the lateral pressure when pouring the concrete C and prevent the circular formwork 10 from shifting position.

[0036] The installation surface side fixing portion 22 may be fixed to the installation surface 140 at two or more locations, and the formwork side fixing portion 21 may be fixed to the circular formwork 10 at one location. As a result, the installation surface side fixing part 22 is fixed at two or more points, which prevents lateral displacement when a load is applied to the installation surface side fixing part 22. Therefore, it is possible to withstand the lateral pressure when pouring the concrete C and prevent the circular formwork 10 from shifting in position.

[0037] The installation surface side fixing portion 22 may be fixed to the installation surface 140 at one or more locations, and the formwork side fixing portion 21 may be fixed to the circular formwork 10 at two locations. As a result, the formwork-side fixing part 21 is fixed at two or more points, which prevents lateral displacement when a load is applied to the formwork-side fixing part 21. Therefore, it is possible to withstand the lateral pressure when pouring the concrete C and prevent the circular formwork 10 from shifting out of position.

[0038] The installation surface side fixing portion 22 may be fixed to the installation surface 140 at one location, and the formwork side fixing portion 21 may be fixed to the circular formwork 10 at one location. This reduces costs, simplifies the work of fixing the installation surface side fixing portion 22, and facilitates construction.

[0039] The installation surface side fixing portion 22 may be fixed to the installation surface 140 at two or more locations, and the formwork side fixing portion 21 may be fixed to the circular formwork 10 at two or more locations. As a result, the installation surface side fixing portion 22 and the formwork side fixing portion 21 are both fixed at two or more points, so that the circular formwork 10 can be firmly fixed. Therefore, it is possible to withstand the lateral pressure when pouring the concrete C and more reliably prevent the circular formwork 10 from shifting position.

[0040] The circular form 10 is formed by a plurality of plate materials 11, and the plurality of plate materials 11 may include plate materials having different lengths in the circumferential direction of the circular form 10. This allows the plate materials 11 with different circumferential lengths to be combined to form circular formwork 10 with various circumferential lengths. This eliminates the need to create plate materials 11 according to the size of the foundation concrete to be constructed, reducing costs and enabling the foundation formation formwork 1 to be easily constructed. Here, if the multiple plate materials 11 include plate materials with different circumferential lengths around the circular formwork 10, the multiple plate materials 11 may be composed of a first plate material 11 having a first length around the circular formwork 10 and a second plate material 11 having a second length around the circular formwork 10, and the first plate materials 11 and second plate materials 11 may be composed of the same number (one or more).

[0041] Only one of the plurality of plate materials 11 may have a different circumferential length, and the other plate materials 11 may have the same circumferential length. This allows for the formation of circular formwork 10 with various circumferential lengths by combining plate materials 11 with different circumferential lengths, while limiting the number of types of plate materials 11 used to just two, thereby reducing costs and enabling the foundation formation formwork 1 to be easily constructed.

[0042] The plurality of plate materials 11 may all have different lengths in the circumferential direction of the circular form 10. This allows the plate materials 11 having different circumferential lengths to be combined to form circular forms 10 having various circumferential lengths.

[0043] It may be formed of a plurality of plate materials 11, and all of the plate materials 11 may have the same length in the circumferential direction of the circular form 10. This allows the number of types of plate materials 11 used to be limited to one, thereby reducing costs and providing a foundation formation formwork 1 that is easy to construct.

[0044] The formwork mounting members 20 may be spaced apart from one another in the circumferential direction. This allows the formwork mounting members 20 to be positioned appropriately so that the lateral pressure received from the concrete C can be distributed among the multiple formwork mounting members 20. This makes it possible to withstand the lateral pressure when pouring the concrete C and prevent the foundation formation formwork 1 from shifting position.

[0045] The formwork mounting members 20 may be arranged at uneven intervals. As a result, even if the circumferential lengths of the plurality of plate materials 11 are different, the formwork installation members 20 can be disposed at appropriate positions according to the circumferential lengths of the plate materials 11.

[0046] The formwork mounting members 20 may be arranged at equal intervals. This allows the lateral pressure received from the concrete C to be evenly distributed to the multiple formwork installation members 20. Therefore, the lateral pressure when the concrete C is poured can be withstood and displacement of the foundation formation formwork 1 can be prevented.

[0047] The thickness T1 of the formwork mounting member 20 is equal to or less than eight times the thickness T2 of the plate material 11. This allows the formwork 1 to withstand the lateral pressure when pouring the concrete C, and prevents it from shifting position, thereby reducing the cost and weight of the formwork installation member 20.

[0048] The ratio of the length L1 of the formwork-side fixing portion 21 in the extending direction to the length L2 of the installation surface-side fixing portion 22 in the extending direction may be in the range of 1:1.5 to 1:2.0. The length L2 of the installation surface-side fixing portion 22 in the extension direction is longer than the length L1 of the formwork-side fixing portion 21 in the extension direction. This allows the lateral pressure received from the concrete C to be transmitted to the installation surface 140 via the installation surface-side fixing portion 22, which has a long length L2. This prevents the circular formwork 10, which is made of a thin plate material, from collapsing. This allows the circular formwork 10 to withstand the lateral pressure when pouring the concrete C and prevent the foundation-forming formwork 1 from shifting out of position. Furthermore, by limiting the length L2 of the installation surface-side fixing portion 22 in the extension direction to a certain extent (length L1 of the formwork-side fixing portion 21:length L2 of the installation surface-side fixing portion 22 = 1:1.5 to 1:2.0), the formwork installation member 20 can be prevented from becoming large.

[0049] Although one embodiment of the present disclosure has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and configuration changes, combinations, deletions, etc. are also included within the scope that does not deviate from the gist of the present disclosure. [Explanation of symbols]

[0050] 1. Formwork for foundation formation 10 Circular formwork 11, 11a, 11b plate material 12 Connection 13 Fixed part 20 Formwork installation members 21 Formwork side fixing part 22 Installation surface side fixing part 140 Installation surface G1 ground O1 center axis C. Concrete L1 Length of the fixed part on the formwork side in the extension direction L2 Length of the fixed part on the installation surface in the extension direction T1 Thickness of formwork mounting member T2 Plate thickness

Claims

1. A circular form formed by a thin plate surface to be curved; a plurality of formwork mounting members attached to the circular formwork to mount the circular formwork on an installation surface; The thickness of each of the plurality of formwork mounting members is greater than the thickness of the plate material, The plurality of formwork mounting members include formwork-side fixing portions fixed to the circular formwork and installation surface-side fixing portions fixed to the installation surface, The formwork-side fixing portion and the installation surface-side fixing portion extend in a substantially perpendicular direction, The formwork-side fixing portion and the circular formwork are fixed by a means different from that between the installation surface-side fixing portion and the installation surface. Formwork for foundation formation.

2. A circular form formed by a thin plate surface to be curved; a plurality of formwork mounting members attached to the circular formwork to mount the circular formwork on an installation surface; The thickness of each of the plurality of formwork mounting members is greater than the thickness of the plate material, The plurality of formwork mounting members include formwork-side fixing portions fixed to the circular formwork and installation surface-side fixing portions fixed to the installation surface, The formwork-side fixing portion and the installation surface-side fixing portion extend in a substantially perpendicular direction, The formwork-side fixing portion is fixed to the circular formwork by a bolt inserted into the formwork-side fixing portion from the outside of the circular formwork. Formwork for foundation formation.

3. 3. The formwork for forming a foundation according to claim 1, wherein the thickness of said formwork mounting member is large enough to allow said circular formwork to stand on its own.

4. 3. The formwork for forming a foundation according to claim 1, wherein the thickness of said formwork mounting member is large enough to stabilize the shape of said circular formwork.

5. The formwork for forming a foundation according to claim 1 or 2, wherein the thicknesses of the plurality of formwork mounting members are the same.

6. The foundation formation formwork according to claim 1 or 2, wherein the circular formwork is formed into a circular shape in a plan view by receiving equal force from the concrete being poured around the circular formwork depending on its height.

7. The formwork for forming a foundation according to claim 1 or 2, wherein the formwork-side fixing portion is attached to the outside of the circular formwork.

8. The formwork for forming a foundation according to claim 1 or 2, wherein the installation surface side fixing portion extends outward from the circular formwork.

9. The formwork for foundation formation according to claim 1 or 2, wherein the installation surface side fixing portion extends in a radial direction of a circle formed by the circular formwork in a plan view.

10. The installation surface side fixing portion is fixed to the installation surface at two or more points, The formwork for forming a foundation according to claim 1 or 2, wherein the formwork-side fixing portion is fixed to the circular formwork at one location.

11. the installation surface side fixing portion is fixed to the installation surface at one location, The formwork for forming a foundation according to claim 1 or 2, wherein the formwork-side fixing portion is fixed to the circular formwork at two or more points.

12. the installation surface side fixing portion is fixed to the installation surface at one location, The formwork for forming a foundation according to claim 1 or 2, wherein the formwork-side fixing portion is fixed to the circular formwork at one location.

13. The installation surface side fixing portion is fixed to the installation surface at two or more points, The formwork for forming a foundation according to claim 1 or 2, wherein the formwork-side fixing portion is fixed to the circular formwork at two or more points.

14. The circular formwork is formed of a plurality of plates, The formwork for forming a foundation according to claim 1 or 2, wherein the plurality of plate materials include plate materials having different lengths in the circumferential direction of the circular formwork.

15. The formwork for forming a foundation according to claim 14, wherein only one of the plurality of plate members has a different circumferential length, and the other plate members have the same circumferential length.

16. The formwork for forming a foundation according to claim 14, wherein all of the plurality of plate materials have different lengths in the circumferential direction of the circular formwork.

17. The circular formwork is formed of a plurality of plates, 3. The formwork for forming a foundation according to claim 1, wherein all of the plurality of plate materials have the same length in the circumferential direction of the circular formwork.

18. 3. The formwork for forming a foundation according to claim 1, wherein the plurality of formwork mounting members are arranged spaced apart from one another in the circumferential direction.

19. The formwork for forming a foundation according to claim 18, wherein the formwork mounting members are arranged at uneven intervals.

20. The formwork for forming a foundation according to claim 18, wherein the plurality of formwork mounting members are arranged at equal intervals.

21. 3. A formwork for forming a foundation according to claim 1, wherein the thickness of said formwork mounting member is not more than eight times the thickness of said plate material.

22. A formwork for foundation formation as described in claim 1 or 2, wherein the ratio of the length of the formwork side fixing portion in the extension direction to the length of the installation surface side fixing portion in the extension direction is in the range of 1:1.5 to 1:2.0.

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