Termite-proof foundation construction method and termite-proof foundation structure

Abstract

To provide a termite-proof foundation construction method and a termite-proof foundation structure, which employ a paper panel as a base part formwork, rationalize a means for connecting the base part formwork and a rising part formwork, and can efficiently construct a uniform termite-proof line at a joint between the rising part and a concrete floor. [Solution] The middle part 12 of the paper panel 1 is folded over so as to fit along the bottom frame material 34 of the steel panel 3, and the upper part 11 of the paper panel 1 is raised along the outer surface of the steel panel 3, then folded back and temporarily fixed in a state where it is engaged with the bottom frame material 34 of the steel panel 3. The paper panel 1 has a termite-proof surface 15 formed in advance, which is positioned to match the height of the joint between the raised part and the concrete floor, and is buried under the concrete floor in a folded state along the lower corner of the joint.

Description

[Technical field]

[0001] The invention disclosed in this application relates to a termite-proof foundation construction method applicable to continuous foundations of houses and the like, and to a termite-proof foundation structure constructed by this termite-proof foundation construction method. [Background technology]

[0002] As the foundation structure for houses and other small and medium-sized buildings, a continuous footing foundation with an inverted T-shaped cross section, in which a rising part is provided on a base part buried in the ground, is widely used. The formwork for constructing this continuous footing is usually composed of a base part formwork and a rising part formwork combined together. The applicant has developed and put into practical use a foundation construction method that uses a steel panel (metal form) for the rising part formwork and a synthetic resin throwaway formwork with a cross section of approximately 1 / 4 arc shape for the base part formwork, thereby improving the construction quality of the formwork and the workability when pouring concrete and removing the formwork, and has disclosed related technologies in Patent Documents 1 to 3, etc.

[0003] This foundation construction method is designed to pour concrete from the base part to the rising part at once. Therefore, before pouring concrete, it is necessary to firmly connect the upper edge of the base part form to the lower frame material of the rising part form so that the base part form does not disintegrate or float up due to the pressure when pouring concrete. The above-mentioned Patent Documents 1 to 3 also propose clamps, support members, connecting members, etc. as the connecting means. However, there is room for further improvement of these connecting means in terms of construction labor, cost, etc.

[0004] In recent years, with the rise in environmental awareness, there has been growing resistance to burying synthetic resin disposable formwork underground. Disposable formwork made of biodegradable plastic is also available, but some contractors have negative opinions of it. In addition, biodegradable plastic formwork tends to be less popular than conventional general resin formwork in terms of quality and cost.

[0005] With a slab foundation, the ground surface (dirt floor) other than the foundation is exposed below the floor, so to prevent moisture from entering the ground surface, a concrete floor (moisture-proof concrete) is poured over the entire area surrounded by the rising section. However, if gaps remain at the joints between the concrete floor and the rising section, termites may invade the dirt floor through the gaps. To block such termite entry routes (termite trails), anti-termite chemicals are sprayed in strips along the joints. However, this method not only takes time to carry out on-site construction, but also causes variations in the amount and range of chemicals sprayed, making construction quality unstable.

[0006] A method of laying anti-termite sheets around the concrete floor to block termite trails is also known. For example, Patent Documents 4 to 6 propose various forms of application of anti-termite sheets to joints between the concrete floor and the rising part. For these anti-termite sheets, anti-termite chemicals are mixed into resin sheet material, or stainless steel mesh with meshes large enough that termites cannot pass through is used. However, it is not so easy to lay and temporarily fix the anti-termite sheets around the floor with high accuracy in parallel with the construction of the formwork for the slab or after the concrete for the slab is poured, and there is still room for improvement in terms of construction labor, cost, etc.

[0007] When the problems with the resin disposable formwork mentioned above and the problems with anti-termite construction on the sides of the rising section are considered comprehensively, the option of using anti-termite treated paper formwork material for the part of the formwork that will be buried underground emerges. Patent Document 7 discloses an invention in which the formwork for the base part is made of cardboard that has been treated with an agent to be anti-termite.

[0008] The formwork is made of cardboard plates that surround the peripheral wall of the base, and is reinforced by fixing a pressing plate to the joints between the plates, attaching a bar to maintain the distance in the width direction, and hanging a collapse prevention member on the outside of the plates. Concrete is poured into the formwork to form the base, and after curing, the formwork for the rising part is assembled on top of the base, and concrete is poured into the formwork to form the rising part. After the rising part is removed from the formwork, a cover made of insect-proof cardboard is prepared again and used to cover the area from the bottom of the rising part to the top of the base.

[0009] The cardboard formwork surrounding the base wall and top end is buried, but it decomposes and assimilates into the soil in a relatively short period of time. In addition, cardboard formwork is light and easy to construct, and has good water retention, so it is highly effective for curing. However, the cardboard formwork disclosed in Patent Document 7 is not structured to be able to mold the base and rising parts simultaneously. Its assembly method is also not very efficient, and there is room for further improvement in terms of workability, etc. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Publication No. 07-018860 [Patent Document 2] Japanese Patent Application Publication No. 08-020959 [Patent Document 3] JP 2023-008484 A [Patent Document 4] JP 2002-371643 A [Patent Document 5] JP 2003-056087 A [Patent Document 6] JP 2003-247281 A [Patent Document 7] Japanese Patent Application Publication No. 08-092968 Summary of the Invention [Problem to be solved by the invention]

[0011] The invention disclosed in this application was conceived after a comprehensive review of the various conventional technologies mentioned above, and its first problem to be solved is to provide an anti-termite foundation construction method with excellent workability, which employs environmentally friendly paper disposable formwork as the base formwork of a slab footing, streamlines the means of connecting the base formwork with the rising formwork, and efficiently forms uniform anti-termite lines at the joints between the rising formwork and the concrete floor.

[0012] Additionally, the invention disclosed in this application provides a termite-proof foundation structure constructed by the above-mentioned termite-proof foundation construction method. [Means for solving the problem]

[0013] In order to achieve the above-mentioned object, the invention of the termite-proof foundation construction method disclosed in the present application uses a bendable paper panel as a base part formwork and a steel panel as a rising part formwork, and performs the following [Step 1] to [Step 2]. [Step 11] This is characterized by forming an anti-termite line at the joint between the slab and the concrete floor. [Step 1] An anti-termite treatment is applied in advance to a predetermined position in the height direction of the paper panel to form an anti-termite surface extending in the width direction of the paper panel. [Step 2] The steel panel is erected onto appropriate support members installed on the construction surface to form the rising portion formwork. [Step 3] The middle part of the paper panel in the height direction is placed on the lower frame material of the erected steel panel, The lower frame material Fold it to conform to the shape. [Step 4] The upper part of the paper panel is raised along the outer surface of the steel panel, then folded downward against the underside of a horizontal rib provided on the outer surface, and the folded upper edge is engaged with the middle part which is folded along the shape of the bottom frame material of the steel panel, thereby fixing it to the steel panel. [Step 5] The lower part of the paper panel is slanted to match the shape of the base of the slab footing, and the bottom edge is fixed to the construction surface to form a base formwork. [Step 6] Concrete is poured into the space enclosed by the base portion formwork and the rising portion formwork to form the base portion and the rising portion. [Step 7] After the concrete has cured, the engagement is released, the middle and upper portions of the paper panel are removed from the steel panel, and the steel panel is demolded. [Step 8] The upper part of the paper panel is raised along the side of the raised part after demolding and temporarily fixed in place. [Step 9] Backfill soil is poured into the floor space surrounded by the slab footing, burying it up to halfway along the height of the raised portion, and then the floor is prepared so that it is located in the area of ​​the termite-resistant surface of the paper panel. [Step 10] The upper part of the paper panel exposed above the floor is folded along the floor and placed on top of the floor. [Step 11] Pour concrete into the floor.

[0014] Furthermore, the anti-termite foundation construction method of the invention disclosed in this application is characterized in that in the above-mentioned [Step 4], the side edge portion of the paper panel that has been raised along the outer surface of the steel panel is folded toward the outer surface of the steel panel, and the upper part of the paper panel is fixed by pushing the side edge portion between the cross rib and the bottom frame material.

[0015] Furthermore, in the above-mentioned [Step 8], the side edge portions of the folded paper panels are unfolded and the upper portions of adjacent paper panels are abutted or overlapped with each other.

[0016] Furthermore, in the above-mentioned [Step 5], the lower portions of the adjacent paper panels are abutted or overlapped with each other.

[0017] In the above-mentioned anti-termite foundation construction method, it is also preferable to pre-process fold lines at the locations where the paper panel will be folded.

[0018] Furthermore, the invention of the termite-proof foundation structure disclosed in this application is characterized in that a paper panel is arranged so that it extends upward from the outer surface of the base portion of the slab footing, via the connection point between the base portion and the rising portion, along the side of the rising portion, bends toward the floor along the lower corner of the joint between the rising portion and the floor concrete poured at a height halfway through the rising portion, and extends continuously over a predetermined range of the peripheral edge of the underside of the concrete floor, and the paper panel forms a termite-proof surface that has been treated with an anti-termite treatment within a predetermined range surrounding the lower corner of the joint. Effect of the Invention

[0019] The above-mentioned construction method for anti-termite foundations involves folding the middle part of the paper panel so that it fits over the bottom frame of the steel panel, then raising the top part of the paper panel along the outer surface of the steel panel, folding it back down, and temporarily fixing it in a state where it is engaged with the bottom frame of the steel panel. By temporarily fixing the paper panel by engaging it with the bottom frame of the steel panel in this way, the means for connecting the base part formwork and the rising part formwork can be rationalized. As a result, it is possible to greatly reduce the number of clamps, support members, connecting members, etc. that were previously required to connect the upper edge of the base part formwork to the bottom frame of the rising part formwork. If fold lines are formed in advance at the specified positions of the paper panel, the workability can be further improved.

[0020] By placing the anti-termite surface of the paper panel in a folded state so that it fits along the lower corner of the joint between the rising part of the slab and the concrete floor, a uniform anti-termite line can be efficiently formed at the joint. The process of spraying anti-termite chemicals at the construction site can be eliminated, shortening the construction period and stabilizing the construction quality in terms of anti-termite performance. The burden on the soil environment is also reduced because no disposable formwork made of synthetic resin is used. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a plan view showing an example of a paper panel used in the base formwork of a slab foundation. [Diagram 2] FIG. 2 is a perspective view showing an image of the paper panel of FIG. 1 attached to a steel panel. [Diagram 3] FIG. 2 is a cross-sectional view for explaining [Step 2] to [Step 5] of the termite-proof foundation construction method disclosed in the present application. [Figure 4] FIG. 11 is a cross-sectional view for explaining [Step 6]. [Diagram 5] FIG. 11 is a cross-sectional view for explaining [Step 7] of the same invention. [Figure 6] FIG. 11 is a cross-sectional view for explaining [Step 8]. [Figure 7] FIG. 11 is a cross-sectional view for explaining [Step 9]. [Figure 8] FIG. 11 is a cross-sectional view illustrating [Step 10]. [Figure 9] FIG. 11 is a cross-sectional view illustrating the same process. [Figure 10] FIG. 13 is a plan view showing a modified example of the paper panel. [Figure 11] FIG. 11 is a perspective view showing an image of the paper panel of FIG. 10 attached to a steel panel. [Figure 12] FIG. 12 is a perspective view showing an image of the paper panel in FIG. 11 unfolded and erected after the steel panel is removed. [Figure 13] FIG. 13 is a perspective view showing an image of the paper panel of FIG. 12 folded and laid on a dirt floor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the invention disclosed in the present application will be described in accordance with the steps set forth in the claims, with reference to the drawings.

[0023] This anti-termite foundation construction method is configured to use a bendable paper panel 1 as a base part formwork of a slab foundation, and a steel panel 3 as a rising part formwork. First, the steel panel 3 used in this anti-termite foundation construction method will be described with reference to Figs. 2 and 3. The steel panel 3 is not particularly different from that generally used in the past, and is configured by joining frame materials (vertical frame material 32, upper frame material 33, lower frame material 34) to the back (outside) of the four periphery of a face plate 31 that has been surface-treated to enhance the peelability of concrete. In the illustrated embodiment, a flat rectangular cross-section shaped material is used for the vertical frame material 32, and an irregular L-shaped cross-section shaped material (see Fig. 3) is used for the upper frame material 33 and the lower frame material 34. The L-shaped cross-section shaped material is joined so that its long piece 35 is perpendicular to the face plate 31 and its short piece 36 protrudes toward the inside of the face.

[0024] Stiffening ribs (vertical ribs 37, horizontal ribs 38) are joined to the middle part of the back surface of the face plate 31. The vertical ribs 37 and horizontal ribs 38 in the illustrated embodiment are made of flat plate material and are arranged crosswise in a crisscross pattern so as to divide the height and width of the steel panel 3 into multiple locations. The number and spacing of these vertical ribs 37 and horizontal ribs 38 are appropriately set according to the overall size of the steel panel 3, and the paper panel 1 described below is prepared in advance to correspond to the rib arrangement of the steel panel 3.

[0025] In the present specification, the shallow recessed space, rectangular in front view and formed on the back side of the steel panel 3 and partitioned by the frame members 32, 33, 34 and the ribs 37, 38, is referred to as the "inter-rib recess" (no symbol). For convenience of the following description, the opposing distance between the lower frame member 34 and the horizontal rib 38, or the opposing distance between the horizontal ribs 38, 38, is defined as the "height of the inter-rib recess", and the opposing distance between the vertical frame member 32 and the vertical rib 37, or the opposing distance between the vertical ribs 37, 37, is defined as the "width of the inter-rib recess". In the illustrated embodiment, all nine inter-rib recesses are set to have the same height A and width B, but the size of the inter-rib recesses may differ depending on the location.

[0026] [Process 1] Fig. 1 shows the planar shape of the paper panel 1 prepared to match the above-mentioned steel panel 3. The paper panel 1 is made of a material such as thick processed paper or thin cardboard that has an appropriate rigidity to withstand the filling pressure when pouring concrete, and water resistance and water repellency to the extent that it does not soften due to the moisture in the concrete.

[0027] The paper panel 1 of the exemplary embodiment is a vertically long rectangle, and its width W is formed to match the width B of the recess between the ribs of the steel panel 3. In the height (vertical side) direction, the upper part 11, the middle part 12, and the lower part 13 are integrally continuous. The upper part 11 is set to a height approximately twice the height A of the recess between the ribs of the steel panel 3. More specifically, the height of the upper part 11 is set so as not to be below an appropriate height that allows the upper edge 14 of the upper part 11 to be engaged with the inside corner between the long piece 35 and the short piece 36 of the lower frame material 34 in step 4 described later. The middle part 12 is a part having a height corresponding to the cross-sectional dimension (the total dimension of the long piece 35 and the short piece 36) of the lower frame material 34 of the steel panel 3. The lower part 13 is a part having a height corresponding to the length of the oblique side of the base part having a substantially trapezoidal cross-sectional shape. A plurality of fold lines 21-25 extending in the width direction are processed in the range from the boundary between the middle portion 12 and the lower portion 13 to the upper portion 11. The specific positions and functions of these fold lines 21-25 will be described later with reference to Fig. 3 and other figures showing the procedure for attaching the paper panel 1 to the steel panel 3.

[0028] In addition, a termite-proof surface 15 extending in a band shape in the width direction is formed on the upper portion 11 of the paper panel 1. This termite-proof surface 15 is formed by an appropriate termite-proofing treatment, such as coating or impregnating the base paper of the paper panel 1 with an agent, or attaching a flexible sheet material mixed with an agent. However, in this invention, the detailed method of the termite-proofing treatment and the agent components are not particularly limited. The termite-proof surface 15 may be formed on either the front or back surface of the paper panel 1, or on both the front and back surfaces. The specific position and function of this termite-proof surface 15 will be described later with reference to FIG. 7.

[0029] [Process 2] When constructing a slab footing, appropriate support members 54 for supporting the formwork and reinforcing bars 53 of the slab footing are placed on the construction surface, which has been prepared with groundwork such as broken granite 51 and basing concrete 52, and then the steel panels 3 are erected on top of them to form the rising formwork. Although U-pins, separators, fasteners and other peripheral components of the formwork used to connect the steel panels 3 are not shown, in this invention any suitable combination of conventionally known components can be used.

[0030] [Process 3] 3(a)-(b), the middle part 12 of the paper panel 1 is placed on the bottom frame material 34 of the steel panel 3 so as to match the width with the recess between the ribs of the steel panel 3, and the fold lines 21, 22, and 23 formed on the middle part 12 are folded and folded so as to fit along the inside of the bottom frame material 34 of the steel panel 3. That is, in this paper panel 3, the fold line 21 is set to be the boundary line between the lower part 13 and the middle part 12, and the fold line 23 is set to be the boundary line between the middle part 12 and the upper part 11. In the illustrated embodiment, the fold line 21 at the lowest position shown in FIG. 1 is mountain-folded as seen by the worker and placed on the upper edge of the short piece 36 of the bottom frame material 34. The second fold line 22 from the bottom is valley-folded and placed on the inside corner between the short piece 36 and the long piece 35 of the bottom frame material 34. The third fold line 23 from the bottom is folded in a valley and pressed into the corner between the long piece 35 of the bottom frame material 34 and the face plate 31. If the fold lines 21-23 are precisely formed to match the cross-sectional dimensions of the bottom frame material 34, then the paper panel 1 can be temporarily fixed to the steel panel 3 by just pressing in this way.

[0031] [Step 4] In the illustrated embodiment, when the upper portion 11 of the paper panel 1 is raised along the outer surface of the steel panel 3, the uppermost fold line 25 is formed at a position where it abuts against the lower surface of the horizontal rib 38 directly above the lower frame material 34, as shown in FIG. 3(c). Then, the upper portion 11 of the paper panel 1 is folded downward at this fold line 25, and the folded upper edge 14 is overlapped with the middle portion 12 folded along the shape of the lower frame material 34, and is engaged by being pushed into the inside corner between the long piece 35 and the short piece 36 of the lower frame material 34. Then, the portion from the fold line 25 to the upper edge 14 is pushed diagonally between the lower frame material 34 and the horizontal rib 38, pressing the middle portion 12 against the lower frame material 34. In other words, the dimension from the fold line 25 to the upper edge 14 in the upper portion 11 of the paper panel 1 is set to correspond to the distance between the lower frame material 34 and the horizontal rib 38. With this type of engagement, the middle portion 12 and upper portion 11 of the paper panel 1 are fixed between the lower frame material 34 of the steel panel 3 and the horizontal rib 38 directly above it. It is also possible to set the height of the folded-back portion of the upper portion 11 of the paper panel 1 relatively high in advance, and then position the upper edge 14 on-site by bending or cutting it to match the height of the recess between the ribs.

[0032] [Step 5] Once the upper part 11 and middle part 12 of the paper panel 1 are fixed to the steel panel 3, as shown in Figure 3(d), the lower part 13 of the paper panel 1 is inclined to spread out to match the shape of the base, and the appropriate place of the lower edge is fixed to the construction surface. This completes the base formwork.

[0033] [Step 6] 4, concrete is poured into the space within the formwork surrounded by the base formwork (lower part 13 of paper panel 1) and rising part formwork (steel panel 3) to integrally mold the base part 41 and rising part 43. At this time, the filling pressure of the concrete acts from inside the base formwork in a direction that pushes the lower part 13 of the paper panel 1 outward, but because the middle part 12 of the paper panel 1 is fixed in a state where it is folded over the bottom frame material 34 of the steel panel 3, the shape of the lower part 13 is appropriately maintained.

[0034] [Step 7] After the concrete has hardened after a prescribed curing time, the upper edge 14 of the paper panel 1 engaged with the lower frame material 34 of the steel panel 3 is pulled outward, as shown in Figure 5, to release the engagement state of [Step 4]. Then, the middle part 12 and the upper part 11 of the paper panel 1 are pulled away from the steel panel 3 so as to open outward, and only the steel panel 3 is removed from the mold. At this time, the lower part 13 of the paper panel 1 is stuck to the concrete of the base part 41, but even if it peels off slightly, it can be simply reattached.

[0035] [Step 8] After the steel panel 3 has been removed from the form, the middle portion 12 of the paper panel 1 is folded again over the connection between the base portion 41 and the rising portion 43, as shown in Figure 6. The cross-sectional dimensions of the bottom frame material 34 of the steel panel 3 and the cross-sectional dimensions of the concrete surface after removal of the form will differ by the material thickness of the face plate 31 and bottom frame material 34 of the steel panel 3, but this portion will be backfilled in the next process, so a small gap is not a problem. The upper portion 11 of the paper panel 1 is extended upward along the side of the rising portion 43, and is temporarily fixed to the surface of the concrete with adhesive tape (not shown) or the like.

[0036] [Step 9] Next, as shown in FIG. 7, backfill soil 5 is poured into the dirt floor space surrounded by the strip footing, and is buried up to a point halfway in the height direction of the rising portion 43, and then compacted and leveled to prepare the dirt floor surface 51. The middle portion 12 and the lower portion 13 of the paper panel 1 are buried in the backfill soil 5, and approximately half of the upper portion 11 is exposed above the dirt floor surface 51. The position of the termite-proof surface 15 formed in advance on the paper panel 1 is set so that it approximately matches the height of the dirt floor surface 51. In other words, the dirt floor surface 51 is prepared to match the center of the area of ​​the termite-proof surface 15 formed on the paper panel 1. A fold line 24 is also formed near the center in the height direction of the termite-proof surface 15.

[0037] In the illustrated embodiment, the center of the anti-termite surface 15 and the fold line 24 are located below the fold line 25 that abuts against the horizontal rib 38 of the steel panel 3, but the relative positions of these fold lines 24, 25 may be reversed depending on the height of the horizontal rib 38 of the steel panel 3 and the level of the earthen floor 51. In addition, the anti-termite surface 15 does not necessarily have to be provided with equal widths above and below the fold line 24, and may be provided over a wider area or even over the entire surface of the paper panel 1.

[0038] [Step 10] 8, the upper portion 11 of the paper panel 1 exposed above the earthen floor surface 51 is folded along the fold lines 24 so as to fit the earthen floor surface 51, and is placed on the earthen floor surface 51. At this time, the termite-proof surface 15 is also bent into an L-shaped cross section.

[0039] [Step 11] As shown in Fig. 9, concrete floor (waste concrete) 6 is poured on the floor 51. As a result, the paper panel 1 extends from the outer surface of the base 41, via the connection between the base 41 and the rising portion 43, along the side of the rising portion 43 to the height of the floor 51, bends toward the floor along the lower corner of the joint between the rising portion 43 and the concrete floor 6, and continues to a predetermined range of the periphery of the underside of the concrete floor 6. In this way, a termite-proof foundation structure is completed with a termite-proof surface arranged in the lower corner of the joint.

[0040] 10 to 13 show modified examples of paper panels used in the above-mentioned anti-termite foundation construction method. The paper panel 1 shown in Fig. 1 is formed so that its width W matches the width B of the recess between the ribs of the steel panel 3, so when the upper portion 11 of the paper panel 1 is expanded upward or to the side after the steel panel 3 is removed from the form, a gap corresponding to the plate thickness of the vertical rib 37 or vertical frame member 32 is generated between the side edges of adjacent paper panels 1. To close the gap, the paper panel 10 in Fig. 10 is wider than the paper panel 1 in Fig. 1.

[0041] The paper panel 10 in Fig. 10 has widened sections 16, 16 added to both the left and right sides of a central portion having the same width W as the paper panel 1 in Fig. 1. The width X of the widened section 16 in the illustrated embodiment is set to be approximately the same as the depth of the recess between the ribs of the steel panel 3. The vertical positional relationship of the multiple fold lines 21-25 formed in the width direction of this paper panel 10 and the termite-proof surface 15 is the same as that of the paper panel 1 in Fig. 1.

[0042] Vertical fold lines 26, 26 are formed between the central portion and the widened portions 16, 16 in the upper portion 11 and the middle portion 12 of the paper panel 10. In addition, a cut 17 having the same size as the width X of the widened portion 16 is formed at both ends of the fold line 21 which is the boundary between the middle portion 12 and the lower portion 13. When the upper portion 11 and the middle portion 12 are engaged with the steel panel 3, the widened portions 16, 16 on the outside of the fold line 26 are overlapped with the central portion, or as shown in FIG. 11, are folded so as to be aligned with the vertical rib 37 or the vertical frame member 32 (including the lower frame member 34 as necessary) surrounding the recess between the ribs, and the folded side edge portions (the widened portions 16, or the overlapping portions between the widened portions 16 and the central portion) are fixed by being pressed into the height A and width B of the recess between the ribs.

[0043] The lower part 13 of the paper panel 10 overhangs the outside of the steel panel 3 with the upper part 11 and middle part 12 fixed in the recesses between the ribs, so the vertical fold line 26 does not extend to the lower part 13. The lower parts 13 overhanging the outside of the steel panel 3 overlap with the lower parts 13 of adjacent paper panels 10. The overlapping lower parts 13 may be attached to each other with tape or the like. By overlapping the lower parts 13 of adjacent paper panels 10, the strength of the base formwork is increased.

[0044] After the paper panel 10 is fixed to the steel panel 3 in this way, concrete is poured to integrally form the base portion 41 and the rising portion 43. Then, as shown in FIG. 12, the widened portion 16 of the paper panel 10 is unfolded after the steel panel 3 is removed from the mold, and the widened portions 16, 16 of the adjacent paper panels 10 are overlapped along the side of the rising portion 43. Furthermore, after the floor is backfilled, the widened portions 16, 16 of the adjacent paper panels 10 are folded while overlapping each other, and are placed on the floor surface 51 (FIG. 8) as shown in FIG. 13. Then, the termite-proof surfaces 15 of the adjacent paper panels 10 are also bent in the overlapping state and laid under the concrete floor 6. Thus, a termite-proof line without gaps can be formed at the joint between the rising portion 43 and the concrete floor 6.

[0045] In addition, in forming a gap-free anti-termite line, the width X of the widened portion 16 in the paper panel 10 as described above can be changed as appropriate. For example, the width X of the left and right widened portions 16 may be set so that when the paper panel 10 is unfolded after the steel panel 3 is removed, the side edges of the adjacent paper panels 10 abut against each other. Alternatively, the widened portion 16 may be added only to either the left or right side of the center portion, and when the adjacent paper panels 10 are unfolded, the widened portion 16 may be configured to overlap the other edge of the left or right side of the center portion of the adjacent paper panels 10. Furthermore, the width X of the widened portion 16 may be changed as appropriate between the upper portion 11 and the middle portion 12 of the paper panel 10 and the lower portion 13 as necessary. In addition, the cut 17 may be formed at an appropriate location depending on the folding method other than the position of the fold line 21 that is the boundary between the middle portion 12 and the lower portion 13.

[0046] As explained above, this anti-termite construction method involves folding the middle part of the paper panel so that it fits over the bottom frame of the steel panel, then raising the top part of the paper panel along the outer surface of the steel panel, folding it back down, and temporarily fixing it in a state where it is engaged with the bottom frame of the steel panel. By temporarily fixing the paper panel by engaging it with the bottom frame of the steel panel in this way, the connecting means between the base part formwork and the rising part formwork can be rationalized. As a result, it is possible to greatly reduce the number of clamps, support members, connecting members, etc. that were previously required to connect the upper edge of the base part formwork to the bottom frame of the rising part formwork. If folding lines are formed in advance at the specified positions of the paper panel, the workability can be further improved.

[0047] The anti-termite surface of the paper panel is placed along the lower corner of the joint between the rising part and the concrete floor, and by folding it along the lower corner, a uniform anti-termite line can be efficiently formed at the joint. The process of spraying anti-termite chemicals at the construction site can be eliminated, shortening the construction period and stabilizing the construction quality in terms of anti-termite performance. The burden on the soil environment is also reduced because no disposable formwork made of synthetic resin is used.

[0048] The technical scope of the invention disclosed in this application should not be interpreted as being limited by the exemplified embodiments, but should be interpreted conceptually based on the description of the claims. The names of the components used in the claims and the specification are for convenience in order to make the invention easier to understand specifically, and the names do not limit the concept or properties of the components more than necessary. When implementing the invention disclosed in this application, the detailed shape, dimensions, structure, material, quantity, combination form with other elements, relative positional relationship, etc. of the components not specifically specified in the claims can be appropriately modified within the scope of utilizing an operating principle substantially equivalent to the exemplified form, or within the scope of obtaining an action effect substantially equivalent to or greater than the exemplified form.

[0049] Specifically, the width of the illustrated paper panel was set to correspond to the width B of the recess between the ribs of the steel panel, but it is also possible to use a wider paper panel that covers multiple recesses between the ribs and perform the same construction. Also, even if the bottom frame material of the steel panel is not an L-shaped cross-section member as illustrated but a rectangular cross-section member or other member, it is possible to improve construction and obtain similar anti-termite performance by temporarily fastening the paper panel to the bottom frame material of the steel panel with simple clips, adhesive tape, or the like.

[0050] Furthermore, the embodiments and other matters disclosed in this specification can also be understood as the technical ideas described in the following supplementary notes.

[0051] (Appendix 1) A bendable paper panel is used as the base formwork, and a steel panel is used as the rising formwork. [Step 11] This is a termite-proof foundation construction method, characterized by forming termite-proof lines at the joints between the slab foundation and the concrete floor. [Step 1] An anti-termite treatment is applied in advance to a predetermined position in the height direction of the paper panel to form an anti-termite surface extending in the width direction of the paper panel. [Step 2] The steel panel is erected onto appropriate support members installed on the construction surface to form the rising portion formwork. [Step 3] The middle part of the paper panel in the height direction is placed on the lower frame material of the erected steel panel, The lower frame material Fold it to conform to the shape. [Step 4] The upper part of the paper panel is raised along the outer surface of the steel panel, then folded downward against the underside of a horizontal rib provided on the outer surface, and the folded upper edge is engaged with the middle part which is folded along the shape of the bottom frame material of the steel panel, thereby fixing it to the steel panel. [Step 5] The lower part of the paper panel is slanted to match the shape of the base of the slab footing, and the bottom edge is fixed to the construction surface to form a base formwork. [Step 6] Concrete is poured into the space enclosed by the base portion formwork and the rising portion formwork to form the base portion and the rising portion. [Step 7] After the concrete has cured, the engagement is released, the middle and upper portions of the paper panel are removed from the steel panel, and the steel panel is demolded. [Step 8] The upper part of the paper panel is raised along the side of the raised part after demolding and temporarily fixed in place. [Step 9] Backfill soil is poured into the floor space surrounded by the slab footing, burying it up to halfway along the height of the raised portion, and then the floor is prepared so that it is located in the area of ​​the termite-resistant surface of the paper panel. [Step 10] The upper part of the paper panel exposed above the floor is folded along the floor and placed on top of the floor. [Step 11] Pour concrete into the floor.

[0052] (Appendix 2) In step 4 of the anti-termite foundation construction method described in Appendix 1, The side edge portion of the paper panel that has been raised along the outer surface of the steel panel is folded toward the outer surface of the steel panel, and the upper portion of the paper panel is fixed by pushing the side edge portion between the horizontal rib and the lower frame material. A method for constructing an anti-termite foundation.

[0053] (Appendix 3) In step 8 of the anti-termite foundation construction method described in Appendix 2, The side edge portions of the folded paper panels are unfolded, and the upper portions of the adjacent paper panels are brought into contact with or overlapped with each other. A method for constructing an anti-termite foundation.

[0054] (Appendix 4) In step 5 of the anti-termite foundation construction method described in Appendix 1, 2 or 3, abutting or overlapping the lower portions of the adjacent paper panels; A method for constructing an anti-termite foundation.

[0055] (Appendix 5) In the anti-termite foundation construction method described in any one of appendices 1 to 4, The paper panel is pre-processed with fold lines at the places where it will be folded. A method for constructing an anti-termite foundation.

[0056] (Appendix 6) The paper panels are arranged so that they extend from the outer surface of the base portion of the slab footing, through the connection between the base portion and the rising portion, upward along the side of the rising portion, bend toward the floor along the lower corner of the joint between the rising portion and the floor concrete poured at a height halfway through the rising portion, and continue over a predetermined range of the peripheral edge of the underside of the floor concrete, The paper panel has a termite-resistant surface that has been treated with an anti-termite treatment within a predetermined range that includes the lower corner of the joint. A termite-proof foundation structure characterized by: [Industrial Applicability]

[0057] The invention disclosed in this application can be widely used as an anti-termite construction method for slab foundations or similar foundation structures. In addition, the construction method of burying anti-termite treated paper panels 1 in the ground to form an anti-termite line can also be applied to structures and fixtures other than concrete foundations. [Explanation of symbols]

[0058] 1 Paper panel 10 Paper Panel 11 Top 12 Middle section 13 Lower 14 Upper border 15 Anti-termite surface 16 Widening section 21~25 (Horizontal) Fold Lines 26 (Vertical) fold line 3 Steel Panel 31 Face plate 32 Vertical frame material 33 Upper frame material 34 Lower frame material 35 Long piece 36 short piece 37 Vertical ribs 38 Horizontal ribs 41 Base 43 Rising part 5 Backfill soil 51 Doma (dirt floor) 6 Concrete floor

Claims

1. This method for constructing an anti-termite foundation is characterized in that a bendable paper panel is used as a base part formwork, a steel panel is used as a rising part formwork, and an anti-termite line is formed at the joint between the slab footing and the concrete floor by the following [Step 1] to [Step 11]. [Step 1] An anti-termite treatment is applied in advance to a predetermined position in the height direction of the paper panel to form an anti-termite surface extending in the width direction of the paper panel. [Step 2] The steel panel is erected onto appropriate support members installed on the construction surface to form the rising portion formwork. [Step 3] The middle part of the paper panel in the height direction is placed on the bottom frame material of the erected steel panel, and folded to fit the shape of the bottom frame material. [Step 4] The upper part of the paper panel is raised along the outer surface of the steel panel, then folded downward against the underside of a horizontal rib provided on the outer surface, and the folded upper edge is engaged with the middle part which is folded along the shape of the bottom frame material of the steel panel, thereby fixing it to the steel panel. [Step 5] The lower part of the paper panel is slanted to match the shape of the base of the slab footing, and the bottom edge is fixed to the construction surface to form a base formwork. [Step 6] Pour concrete into the space within the formwork surrounded by the base portion formwork and the rising portion formwork to form the base portion and the rising portion. [Step 7] After the concrete has cured, the engagement is released, the middle and upper portions of the paper panel are removed from the steel panel, and the steel panel is demolded. [Step 8] The upper part of the paper panel is raised along the side of the raised part after demolding and temporarily fixed. [Step 9] Backfill soil is poured into the floor space surrounded by the slab foundation, burying it up to halfway along the height of the raised portion, and then the floor is prepared so that it is located in the area of ​​the termite-resistant surface of the paper panel. [Step 10] The upper part of the paper panel exposed above the floor is folded along the floor and overlapped on the floor. [Step 11] Pour concrete onto the floor.

2. In the step 4 of the anti-termite foundation construction method according to claim 1, The side edge portion of the paper panel that has been raised along the outer surface of the steel panel is folded toward the outer surface of the steel panel, and the upper portion of the paper panel is fixed by pushing the side edge portion between the horizontal rib and the lower frame material. A method for constructing an anti-termite foundation.

3. In the step 8 of the anti-termite foundation construction method according to claim 2, The side edge portions of the folded paper panels are unfolded, and the upper portions of the adjacent paper panels are brought into contact with or overlapped with each other. A method for constructing an anti-termite foundation.

4. In the step 5 of the anti-termite foundation construction method according to claim 1, 2 or 3, abutting or overlapping the lower portions of the adjacent paper panels; A method for constructing an anti-termite foundation.

5. In the method for constructing a termite-proof foundation according to claim 1, 2 or 3, The paper panel is pre-processed with fold lines at the places where it will be folded. A method for constructing an anti-termite foundation.

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