Method for manufacturing waterproof pan and waterproof pan

Abstract

To provide a waterproof pan larger than the size of plywood.SOLUTION: The manufacturing method of the waterproof pan 100 according to the present embodiment is a manufacturing method of a waterproof pan 100 having a base material 10 in which plywood is stacked in a plurality of layers, and includes a forming step of arranging and forming each layer of the base material 10 in a state in which a plurality of plywood parts having the same thickness are arranged side by side, a laminating step of laminating each layer via an adhesive so that a direction of a boundary between the adjacent layers and the plurality of plywood parts intersects, and a pressure bonding step of pressure-bonding each layer. The forming step further includes a rim member attaching step of attaching a substantially U-shaped rim member 30, which is in contact with an upper surface, a lower surface, and a side surface of the outer peripheral end portion, to the outer peripheral end portion of the layer positioned above the layer positioned at the lowermost layer, after the pressure-bonding step.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a waterproof pan and a waterproof pan. [Background technology]

[0002] Waterproof pans have been used in the construction of entrance halls. For example, Patent Document 1 describes that the construction of an entrance hall can be facilitated by installing a waterproof pan on the subfloor board of the entrance hall's earthen floor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-305405 Summary of the Invention [Problem to be solved by the invention]

[0004] Plywood and other materials are used as the base material for waterproof pans, but the size of pre-made plywood is limited. As a result, the size of the waterproof pan is restricted by the size of the plywood, which has led to the problem that the waterproof pan cannot be used in entrances that are wider than the size of the plywood.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a waterproof pan that is larger than the size of plywood. [Means for solving the problem]

[0006] The method for manufacturing a waterproof pan according to claim 1 includes, for example, as shown in FIGS. 1 to 7, A method for manufacturing a waterproof pan 100 having a base material 10 in which plywood is laminated on multiple layers (upper layer 11a, central layer 11b, lower layer 11c), A forming process (step S2) in which each layer of the base material 10 is formed by arranging a plurality of plywood pieces (plywood parts 1-2 of the upper layer 11a, plywood parts 3-4 of the central layer 11b, and plywood parts 5-6 of the lower layer 11c) of the same thickness in a line; A lamination process (step S3) in which each layer is laminated via an adhesive so that the directions of the boundaries between adjacent layers and the plurality of plywood pieces (plywood parts) intersect; a compression bonding step (step S4) of compressing the layers; Including, The forming step (step S2) includes forming the layer (lower layer 11c) located at the bottom among the layers so that the dimensions in the longitudinal direction and / or the lateral direction are shorter than those of the other layers, After the crimping step (step S4), the method further includes a rim material attachment step (step S7) of attaching an approximately U-shaped rim material 30 to the outer peripheral edge of a layer located above the lowest layer (lower layer 11c), the rim material contacting the upper, lower and side surfaces of the outer peripheral edge.

[0007] According to the invention described in claim 1, each layer of the base material 10 is formed by arranging multiple plywood parts of the same thickness side by side, and each layer is laminated with adhesive so that the boundaries between adjacent layers and plywood parts intersect. This allows for the creation of a waterproof pan 100 that is large enough to serve as a waterproof pan and is larger than the original plywood. Furthermore, the lower layer 11c is formed so that its longitudinal and / or lateral dimensions are shorter than the other layers. After the layers are bonded together, a roughly U-shaped edging member 30 is attached to the outer peripheral edge of the layer above the lower layer 11c, contacting the top, bottom, and side surfaces of the outer peripheral edge. This eliminates the need for router processing of the edge of the base material 10, thereby reducing the number of steps.

[0008] As shown in FIGS. 2 to 5, the invention described in claim 2 is a method for manufacturing a waterproof pan according to claim 1, The method includes a sheet attachment step (step S6) of attaching a waterproof sheet to the top surface of the layer (upper layer 11a) located at the top of the layers before attaching the edging material.

[0009] According to the invention described in claim 2, before the edging material 30 is attached, a waterproof sheet 20 is attached to the upper surface of the uppermost layer (upper layer 11a) of the layers constituting the base material 10, so that the entrance can be easily waterproofed using the waterproof pan 100.

[0010] The invention described in claim 3 is, as shown in FIGS. 1 to 7, a method for manufacturing a waterproof pan according to claim 1, The plurality of plywood boards (plywood parts 1-2 of upper layer 11a, plywood parts 3-4 of central layer 11b, and plywood parts 5-6 of lower layer 11c) forming each layer have a longitudinal direction and a lateral direction in a plan view, The forming step (step S2) includes arranging the plurality of plywood sheets in a state where their longitudinal directions are aligned to form each layer, In the laminating step (step S3), the layers are laminated so that the longitudinal directions of the plywood panels intersect with adjacent layers.

[0011] According to the invention described in claim 3, the multiple plywood pieces that form each layer of the base material 10 (plywood parts 1 and 2 in the upper layer 11a, plywood parts 3 and 4 in the middle layer 11b, and plywood parts 5 and 6 in the lower layer 11c) are arranged side by side so that their longitudinal directions are aligned to form each layer, thereby improving the strength of the base material 10.

[0012] The invention described in claim 4 is, as shown in FIGS. 4 and 5, a method for manufacturing a waterproof pan according to claim 1, The plurality of layers of the base material 10 includes a central layer 11b located in the center, a lower layer 11c laminated below the central layer 11b, and an upper layer 11a laminated on the central layer 11b, In the stacking process (step S4), the layers are stacked so that the direction of the boundaries between the multiple plywood panels (plywood part 5 and plywood part 6) that make up the lower layer 11c is aligned with the direction of the boundaries between the multiple plywood panels (plywood part 1 and plywood part 2) that make up the upper layer 11a, and the position of the boundaries between the multiple plywood panels (plywood part 5 and plywood part 6) that make up the lower layer 11c is offset from the position of the boundaries between the multiple plywood panels (plywood part 1 and plywood part 2) that make up the upper layer 11a.

[0013] According to the invention described in claim 4, the layers are stacked so that the direction of the boundaries between the multiple plywood panels (plywood parts 5 and plywood parts 6) that make up the lower layer 11c is aligned with the direction of the boundaries between the multiple plywood panels (plywood parts 1 and plywood parts 2) that make up the upper layer 11a, and the positions of the boundaries between the multiple plywood panels (plywood parts 5 and plywood parts 6) that make up the lower layer 11c are offset from the positions of the boundaries between the multiple plywood panels (plywood parts 1 and plywood parts 2) that make up the upper layer 11a, thereby improving the strength of the base material 10.

[0014] As shown in FIGS. 5 to 7, the invention described in claim 5 is a method for manufacturing a waterproof pan according to claim 1, The method includes a generating step (step S1) of cutting ready-made plywood (plywoods B1 to B5) to generate the plurality of plywood pieces (plywood parts 1 to 6) that constitute the layers.

[0015] According to the invention described in claim 5, pre-fabricated plywood (plywoods B1 to B5) is cut to produce multiple plywood pieces (plywood parts 1 to 6) that make up each layer of the base material 10, so that a large waterproof pan can be easily produced using pre-fabricated plywood pieces.

[0016] The invention described in claim 6 is, as shown in Figs. 1 to 7, a method for manufacturing a waterproof pan according to claim 5, In the generation process (step S1), when it is necessary to provide a cutout portion 40 in the waterproof pan 100 depending on the installation location of the waterproof pan 100, when cutting the plywood (plywood part 6) among the plurality of plywoods (plywood parts 5 to 6) of the lowest layer (lower layer 11c) among the layers in which the cutout portion 40 needs to be provided, the plywood is cut so as to form a cutout portion larger than the cutout portion 40 that needs to be provided in the waterproof pan 100, and when cutting the plurality of plywoods other than the layer that is lowest among the layers, the cutout portion is not cut.

[0017] According to the invention of claim 6, it is possible to reduce the number of steps by not using a router on the edge of the cutout portion 40 of the base material 10. Furthermore, for each layer other than the lower layer 11c, no cutting work for the cutout portion 40 is performed in the production process, so the work can be made more efficient by, for example, forming the cutout portion 40 in multiple layers collectively in the adjustment process.

[0018] The invention described in claim 7 is, as shown in FIGS. 1 to 7, a method for manufacturing a waterproof pan according to claim 1 or 6, An adjustment step (step S5) of adjusting the dimensions and / or shape of the base material 10 according to the installation location of the waterproof pan 100, In the adjustment step (step S5), the edges of the base material 10 are not subjected to router processing.

[0019] According to the invention described in claim 7, no router processing of the ends is performed in the adjustment process for adjusting the dimensions and / or shape of the base material 10 according to the installation location of the waterproof pan 100, thereby reducing the number of steps.

[0020] The waterproof pan 100 according to claim 8 comprises, as shown in FIGS. 1 to 7, The base material 10 has multiple layers (upper layer 11a, central layer 11b, lower layer 11c) of plywood stacked on top of each other, Each layer of the base material 10 is made up of a plurality of plywood pieces (plywood parts 1-2 of the upper layer 11a, plywood parts 3-4 of the central layer 11b, and plywood parts 5-6 of the lower layer 11c) of the same thickness arranged side by side, The layers are laminated via adhesive so that the directions of the boundaries between adjacent layers and the plurality of plywood boards intersect, A notch 40 is provided, The layer positioned at the bottom of the layers is stacked with a step so that the outer peripheral edge portion including the notch portion 40 is located inside the other layers, An approximately U-shaped rim material 30 is attached to the outer peripheral edge, including the cutout portion 40, of the layer located above the lowest layer, and contacts the upper, lower and side surfaces of the outer peripheral edge.

[0021] According to the invention described in claim 8, each layer of the base material 10 of the waterproof pan 100 is made of multiple plywood sheets of the same thickness arranged side by side, and each layer is laminated with adhesive so that the boundaries between adjacent layers and multiple plywood parts intersect. This allows for a waterproof pan 100 that is large enough to be used as a waterproof pan and is larger than the size of the plywood sheets. Furthermore, the waterproof pan 100 has a cutout 40, and the lowest layer is stacked with a step so that its outer edge, including the cutout 40, is located inward relative to the other layers. A roughly U-shaped edging member 30 is attached to the outer edge, including the cutout 40, of the layer above the lowest layer, contacting the top, bottom, and side surfaces of the outer edge. This allows for a waterproof pan 100 to be provided with the cutout 40, eliminating the need for router processing of the outer edge, including the cutout 40, of the base material 10 during manufacturing, thereby reducing labor costs. [Effects of the Invention]

[0022] According to the present invention, it is possible to provide a waterproof pan that is larger than the size of a plywood board. [Brief explanation of the drawings]

[0023] [Figure 1]FIG. 2 is a plan view of the waterproof pan according to the embodiment. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] 2 is a cross-sectional view of FIG. 1 taken along line B-B. [Figure 4] This is an oblique view showing the waterproof pan base material disassembled into each layer. [Figure 5] 10 is a flowchart showing the flow of a method for manufacturing a waterproof pan. [Figure 6] FIG. 10 is a diagram showing how three pieces of plywood are cut to cut out the upper and lower plywood parts. [Figure 7] This is a diagram showing how to cut two pieces of plywood and remove the plywood part for the center layer. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, although the embodiments described below are subject to various technically preferable limitations for carrying out the present invention, the technical scope of the present invention is not limited to the following embodiments and illustrated examples.

[0025] Fig. 1 is a plan view of a waterproof pan 100 according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line AA in Fig. 1, and Fig. 3 is a cross-sectional view taken along line BB in Fig. 1. Fig. 4 is a perspective view showing the base material 10 of the waterproof pan 100 exploded into each layer.

[0026] The waterproof pan 100 shown in Fig. 1 is a waterproof floor that is installed on the subfloor board of the entrance dirt floor area of ​​a building such as a detached house or an apartment building, and has a size and shape that matches the entrance dirt floor area. The waterproof pan 100 of this embodiment is larger than the size of pre-made plywood, and has a cutout portion 40 that matches the shape of the entrance dirt floor area where it will be installed.

[0027] As shown in Figures 2 and 3, the waterproof pan 100 is constructed by attaching a waterproof sheet 20 made of a thermoplastic synthetic resin such as a vinyl resin or an olefin resin to the surface of a base material 10. The base material 10 is constructed by stacking three layers of plywood: a central layer 11b located in the center, an upper layer 11a located on top of the central layer 11b, and a lower layer 11c located below the central layer 11b. Each of the upper layer 11a, central layer 11b, and lower layer 11c is made by arranging and bonding multiple plywood sheets of the same thickness side by side. The layers are stacked so that the boundaries between the plywood sheets of adjacent layers intersect.

[0028] A roughly U-shaped edging material 30 is attached to the outer peripheral edges of the upper layer 11a, the central layer 11b, and the waterproof sheet 20 so as to contact the top, bottom, and side surfaces of the outer peripheral edges. The height of the edging material 30 is roughly equal to the total thickness of the upper layer 11a, the central layer 11b, and the waterproof sheet 20, and the length and / or width of the lower layer 11c is shorter than the other layers by at least the width of the bottom surface of the edging material 30. In this embodiment, the height of the edging material 30 is approximately 9 mm.

[0029] Fig. 5 is a flowchart showing the flow of a manufacturing method (waterproof pan manufacturing method) for the above-mentioned waterproof pan 100. Hereinafter, the manufacturing method for the waterproof pan 100 will be described with reference to Fig. 5. In this embodiment, it will be described that three pre-made plywood boards B1 to B3 each having a size of 910 mm x 1820 mm and a thickness of 3.0 mm, and two pre-made plywood boards B4 to B5 each having a size of 920 mm x 1830 mm and a thickness of 4.0 mm are used to produce the base material 10.

[0030] First, as shown in FIGS. 6 and 7, a plurality of plywood boards B1 to B5 are cut to produce a plurality of plywood parts that constitute the respective layers of the base material 10 of the waterproof pan 100 (step S1; producing step). In step S1, as shown in FIG. 6, plywood boards B1 to B3 are cut to cut out plywood parts 1 and 2 of upper layer 11a and plywood parts 5 and 6 of lower layer 11c. For example, plywood part 1 is cut out from plywood B1, plywood part 5 is cut out from plywood B2, and plywood parts 2 and 6 are cut out from plywood B3. Furthermore, as shown in FIG. 7, plywood boards B4 and B5 are cut out to cut out plywood parts 3 and 4 of center layer 11b. For example, plywood part 3 is cut out from plywood B4, and plywood part 4 is cut out from plywood B5. Plywood parts 1 to 6 have a longitudinal direction and a lateral direction in a plan view.

[0031] Next, the produced plurality of plywood parts are arranged to form each layer of the base material 10 (step S2; forming step). In step S2, as shown in FIGS. 4, 6, and 7, the longitudinal end E1 of plywood part 1 and the longitudinal end E2 of plywood part 2 are arranged side by side so that they are in contact with each other to form upper layer 11a. Furthermore, the end E3 of plywood part 3 and the end E4 of plywood part 4 are arranged side by side so that they are in contact with each other to form central layer 11b. Furthermore, the end E5 of plywood part 5 and the end E6 of plywood part 6 are arranged side by side so that they are in contact with each other to form lower layer 11c. Furthermore, as shown in FIGS. 6 to 7, the longitudinal and / or lateral dimensions of lower layer 11c are formed to be shorter than those of upper layer 11a and central layer 11b.

[0032] Next, the layers are bonded together to form a laminate (step S3: lamination step). In step S3, as shown in Fig. 4, the plywood parts of adjacent layers are laminated together with adhesive so that the boundaries between them intersect. At this time, as shown in Figs. 1 to 4, the lower layer 11c is laminated so that the ends of the lower layer 11c corresponding to the outer peripheral edges of the upper layer 11a and the central layer 11b to which the rim material 30 is attached are positioned inward relative to the outer peripheral edges of the upper layer 11a and the central layer 11b. For example, in this embodiment, the lower layer 11c is laminated so that the ends of the lower layer 11c corresponding to the outer peripheral edges of the upper layer 11a and the central layer 11b to which the rim material 30 is attached are positioned approximately 15 mm inward relative to the outer peripheral edges of the upper layer 11a and the central layer 11b. In this way, by crossing the directions of the boundaries between the plywood parts of adjacent layers, it is possible to create a base material 10 that can ensure sufficient strength as a waterproof pan.

[0033] 4, it is preferable to laminate the layers in step S3 so that the direction of the boundary between plywood parts 5 and 6 that make up lower layer 11c is aligned with the direction of the boundary between plywood parts 1 and 2 that make up upper layer 11a, and the position of the boundary between plywood parts 5 and 6 that make up lower layer 11c is offset from the position of the boundary between plywood parts 1 and 2 that make up upper layer 11a (the position when viewed from above). This improves the strength of base material 10.

[0034] Next, the stacked layers are pressure-bonded together using a press (step S4: pressure-bonding step). This produces the base material 10.

[0035] Next, the dimensions and / or shape of the base material 10 are adjusted according to the installation location of the waterproof pan 100 (step S5; adjustment step). In step S5, the outer periphery of the base material 10 is cut to adjust the dimensions of the base material 10 according to the size and shape of the entrance floor where the waterproof pan 100 will be installed. In addition, parts of the upper layer 11a and the central layer 11b are cut to form the cutout portions 40.

[0036] Here, as in the past, when a single thick plywood (e.g., plywood approximately 10 mm thick) was used as the base material, in order to attach a rim material whose side height is smaller than the thickness of the plywood (e.g., a rim material with a side height of approximately 9 mm, similar to rim material 30), it was necessary to route the edge of the base material to create a step by trimming the edge to match the side height and bottom width of the rim material. However, routering the edge requires high skill in the operator and equipment, and is time-consuming. It is also difficult to ensure safety. In contrast, in the waterproof pan manufacturing method of this embodiment, three layers of plywood with thicknesses of 3 mm, 4 mm, and 3 mm are stacked with a step so that the outer edge of the lower layer 11c is located inside the upper layer 11a and central layer 11b, as shown in Figures 2 and 3. Therefore, there is no need to route the edge of the base material 10 to attach the rim material 30.

[0037] 6, the reason why the portion corresponding to the cutout 40 is pre-cut in the plywood part 6 of the lower layer 11c is that if this cut is not made and the portion corresponding to the cutout 40 of the lower layer 11c is cut in step S5, as with the upper layer 11a and the central layer 11b, it would be necessary to perform router processing on the end of the cutout 40. When the portion corresponding to the cutout 40 is pre-cut in the plywood part 6 of the lower layer 11c in step S1, the cutout is made so that a cutout larger than the cutout 40 that needs to be provided in the waterproof pan 100 (a cutout larger than the width of the underside of the edging material 30) is formed, so that router processing can be omitted. On the other hand, for plywood part 1 in upper layer 11a and plywood parts 3 and 4 in central layer 11b, the cutout portions 40 are not cut out in step S1, but are formed in step S5, which allows the cutout portions 40 to be formed all at once and improves work efficiency. By forming cutout portions 40 in plywood part 1 in upper layer 11a and plywood parts 3 and 4 in central layer 11b in step S5, lower layer 11c is stacked with a step so that the outer peripheral edge including cutout portions 40 is located more inward than upper layer 11a and central layer 11b.

[0038] Next, the waterproof sheet 20 is attached to the surface of the base material 10 (step S6; sheet attachment step). In step S6, the waterproof sheet 20 is attached to the surface of the upper layer 11a with an adhesive and pressed. The waterproof sheet 20 attached to the upper layer 11a forms a gentle curve in the winding direction of the roll. Therefore, it is preferable to align the winding direction of the waterproof sheet 20 with the direction of the boundary of the upper layer 11a, as this makes the boundary of the base material 10 less noticeable.

[0039] Then, the edging material 30 is attached to the base material 10 (step S7; edging material attaching step). In step S7, the edging material 30 is attached to the outer peripheral edge (the outer peripheral edge including the cutout 40) of the upper layer 11a, the central layer 11b, and the waterproof sheet 20 so as to contact the top, bottom, and side surfaces of the outer peripheral edge. The edging material 30 can be attached by, for example, screwing, but is not limited to this. With the above steps, the waterproof pan 100 is completed. The waterproof pan 100 is installed in the entrance floor area, completing the construction of the entrance.

[0040] As described above, according to the manufacturing method for the waterproof pan 100 of this embodiment, each layer of the base material 10 is formed by arranging multiple plywood pieces of the same thickness side by side, and each layer is laminated with adhesive so that the boundaries between adjacent layers and plywood pieces intersect. This allows for the creation of a waterproof pan 100 that is large enough to serve as a waterproof pan and is larger than the original plywood. Furthermore, the lower layer 11c is formed so that its longitudinal and / or lateral dimensions are shorter than the other layers. After the layers are bonded together, a roughly U-shaped edging member 30 is attached to the outer peripheral edge of the layer above the lower layer 11c, contacting the top, bottom, and side surfaces of the outer peripheral edge. This eliminates the need for router processing of the edge of the base material 10, thereby reducing the number of steps required.

[0041] In addition, before attaching the edging material 30, the waterproof sheet 20 can be attached to the top surface of the upper layer 11a, which is the uppermost layer of the base material 10, to easily make the entrance waterproof.

[0042] Furthermore, the strength of the base material 10 can be improved by stacking each layer of the base material 10 so that the direction of the boundaries between the multiple plywood parts that make up the lower layer 11c is aligned with the direction of the boundaries between the multiple plywood parts that make up the upper layer 11a, and the positions of the boundaries between the multiple plywood parts that make up the lower layer 11c are offset from the positions of the boundaries between the multiple plywood parts that make up the upper layer 11a.

[0043] Furthermore, by cutting pre-made plywood to create multiple plywood parts that make up each layer, a large waterproof pan can be easily created using pre-made plywood.

[0044] Furthermore, if it is necessary to provide a cutout 40 in the waterproof pan 100 depending on the installation location of the waterproof pan 100, when cutting the plywood parts 6 that need to have the cutout 40 among the multiple plywood parts 5 and plywood parts 6 in the lower layer 11c, the plywood parts 6 can be pre-cut so that a cutout larger than the cutout 40 that needs to be provided in the waterproof pan 100 is formed. This avoids router processing of the edge of the cutout 40 in the base material 10, thereby reducing the number of steps. Furthermore, by not performing the cutting work of the cutout 40 in the production process for the plywood parts 1 in the upper layer 11a and the plywood parts 3 and 4 in the central layer 11b, it is possible to form the cutouts 40 all at once in the adjustment process, for example, thereby improving work efficiency.

[0045] The description of the above embodiment is a preferred example of the present invention, and the present invention is not limited to this. For example, in the above embodiment, the waterproof pan 100 has a shape including the cutout portion 40, but the shape of the waterproof pan 100 is not limited to this. For example, the waterproof pan 100 may not have the cutout portion 40.

[0046] Furthermore, the details of the waterproof pan manufacturing method and the waterproof pan 100 can be modified as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0047] 100 Waterproof pants 10 Undercoat 11a upper layer 11b Central layer 11c lower layer 20. Tarpaulin 30 Edge material 1~6 Plywood parts

Claims

1. A method for manufacturing a waterproof pan having a base material made of plywood stacked in multiple layers, a forming step of forming each layer of the base material by arranging a plurality of plywood boards of the same thickness side by side; a lamination step of laminating the layers via an adhesive so that the directions of the boundaries between adjacent layers and the plurality of plywood boards intersect; a compression bonding step of compressing the layers; Including, In the forming step, the layer located at the bottom among the layers is formed so as to have a dimension in the longitudinal direction and / or the lateral direction shorter than that of the other layers, After the crimping step, a substantially U-shaped edge material is attached to the outer peripheral edge of the layer located above the layer located in the lowest layer, the edge material being in contact with the upper surface, lower surface, and side surface of the outer peripheral edge. A method for manufacturing waterproof pans.

2. A sheet attachment step of attaching a waterproof sheet to the upper surface of the uppermost layer of the layers before attaching the edging material is included. A method for manufacturing the waterproof pan according to claim 1.

3. The plurality of plywood boards forming each layer have a longitudinal direction and a lateral direction in a plan view, The forming step includes arranging the plurality of plywood sheets in a state where their longitudinal directions are aligned to form each layer, In the laminating step, the layers are laminated such that the longitudinal directions of the plywood sheets intersect with adjacent layers. A method for manufacturing the waterproof pan according to claim 1.

4. The plurality of layers of the base material include a central layer located at the center, a lower layer laminated below the central layer, and an upper layer laminated above the central layer, In the laminating step, the layers are laminated such that the direction of the boundaries between the plurality of plywood boards constituting the lower layer is aligned with the direction of the boundaries between the plurality of plywood boards constituting the upper layer, and the positions of the boundaries between the plurality of plywood boards constituting the lower layer are offset from the positions of the boundaries between the plurality of plywood boards constituting the upper layer. A method for manufacturing the waterproof pan according to claim 1.

5. A production step of cutting pre-made plywood to produce the plurality of plywood sheets constituting the respective layers, A method for manufacturing the waterproof pan according to claim 1.

6. In the generating process, when it is necessary to provide a cutout portion in the waterproof pan depending on the installation location of the waterproof pan, when cutting the plywood of the plurality of plywoods in the layer located at the lowest position among the layers in which the cutout portion needs to be provided, the plywood is cut so as to form a cutout portion larger than the cutout portion that needs to be provided in the waterproof pan, and when cutting the plurality of plywoods other than the layer located at the lowest position among the layers, the cutout portion is not cut. A method for manufacturing the waterproof pan according to claim 5.

7. An adjustment step of adjusting the dimensions and / or shape of the base material according to the installation location of the waterproof pan, In the adjustment process, no router processing is performed on the end of the base material. A method for manufacturing a waterproof pan according to claim 1 or 6.

8. It has a base material made of multiple layers of plywood, Each layer of the base material is made of a plurality of plywood boards of the same thickness arranged side by side, The layers are laminated via adhesive so that the directions of the boundaries between adjacent layers and the plurality of plywood boards intersect, A cutout portion is provided, the layer located at the bottom of the layers is stacked with a step so that an outer peripheral edge portion including the notch portion is located more inward than the other layers, A substantially U-shaped rim material is attached to the outer peripheral edge including the cutout portion of the layer located above the lowest layer, and is in contact with the upper surface, lower surface, and side surface of the outer peripheral edge, Waterproof pants.

Images