Extruded cement board, corner member obtained from the extruded cement board, method for manufacturing corner member, corner structure constructed using extruded cement board, and molding die equipment

Abstract

To provide an extrusion molding cement plate which prevents cost increase by eliminating the necessity of a post-processing step such as backfilling work of a hollow part and the like and a mouth piece dedicated to a corner member, and which can manufacture a corner member both for an internal corner part and for a projected corner part, even in the case of a design panel in which a rib is provided, to provide a corner member acquired from this extrusion molding cement plate, a manufacturing method of corner member, and a corner structure constituted by using the extrusion molding cement plate.SOLUTION: In an extrusion molding cement plate 1, a plurality of hollow parts is arranged side by side in one direction, and it is used as a corner member 5 by cutting a width-direction end part 1a at an angle of 45 degrees obliquely so as to be inclined with respect to the thickness direction in accordance with a corner angle of 90 degrees. When the width-direction end part 1a is cut obliquely, a cut planned portion 8 for corner constitution is formed which can maintain a second hollow part 4 closest to a cutting line 6 in a perfect shape.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an extruded cement board used as a corner member when combining two sheets to construct a corner structure of a building or the like, a corner member obtained from this extruded cement board, a manufacturing method for the corner member, and a corner structure constructed using the extruded cement board. [Background technology]

[0002] Conventionally, when constructing a corner of a building or the like using extruded cement boards, one end in the width direction of a regular product 50 that is not for corners is cut off at an angle of 45 degrees in the longitudinal direction, and then a filler material 52 such as mortar is filled into an opening k that appears when part of a hollow portion 51 is chipped off by the cutting, and the filler material 52 is allowed to harden to form a corner member 53. A corner member 54 with a V-shaped cross section is constructed by butting the ends of the two corner members 53, 53 together (see FIG. 15).

[0003] When such a corner material 54 is used, after one end is cut off, a part of the hollow portion 51 is chipped off as described above, revealing the opening k. Therefore, it is necessary to prevent damage to the opening k after cutting off, to fill the joints with a noncombustible material to ensure fire resistance, and to backfill the chipped hollow portion 51 as described above to make it easier to cast the sealant. The need for these processing steps increases the time required for production, which is a factor in increasing costs.

[0004] When manufacturing corner components from extruded cement boards with flat surfaces, the widthwise end faces are inclined at the required angle during the extrusion molding stage, allowing two corner components to be combined. When manufacturing extruded cement boards specifically for corner components, there are always parts that protrude diagonally during the extrusion molding stage because the widthwise end faces are inclined. On the other hand, when manufacturing corner components using extruded cement boards with convex ribs on their surface, the ribs are present on the surface of the parts that protrude diagonally, and the weight of the ribs affects the molding accuracy. In the soft, unhardened clay-like stage immediately after extrusion molding, the weight of the ribs causes the protruding parts to deform downwards, making it difficult to maintain the shape, and it was difficult to ensure the shape of the ribs and the standard dimensional accuracy of the product.

[0005] Furthermore, when extrusion molding a corner part with its widthwise end face inclined at a required angle, die equipment dedicated to corner parts must be provided in addition to ordinary die equipment, which requires costs for manufacturing the die and for maintaining and storing it.

[0006] Patent Document 1 describes a method for manufacturing a corner member which includes a step of manufacturing a plate body having sloping sides and a step of joining the sloping surfaces of the plate body, characterized in that a flat connected plate body is extruded in which multiple plate bodies are connected via connecting parts with their sloping surfaces facing each other, and then the connecting parts are separated from the plate bodies to manufacture the plate body. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2004-257024 A Summary of the Invention [Problem to be solved by the invention]

[0008] In the manufacturing method of corner members in Patent Document 1, the end faces in the width direction must be inclined at the required angle to manufacture them as dedicated corner members, and a dedicated jaw is required for corner members. In addition, when using an extruded cement board with ribs on the surface, corner members for recessed corners can be manufactured without the problem of deformation due to the weight of the rib part because the protruding part is on the lower side. However, when manufacturing corner members for protruding corners, the rib side becomes the lower surface to prevent deformation of the protruding part, and the surface on the rib side comes into contact with the roller or the receiving iron plate, making it difficult to ensure the shape and precision of the rib, and there is a problem that it is not possible to manufacture them for protruding corners.

[0009] In view of the problems with the prior art, the present invention aims to provide an extruded cement board which can be used to manufacture corner members for both inside and outside corners, even when used as a design panel with ribs, thereby preventing increases in costs by eliminating the need for post-processing steps such as backfilling of hollow spaces and the need for dedicated nozzles for corner members, a corner member obtained from this extruded cement board, a manufacturing method for a corner member, and a corner structure constructed using an extruded cement board. [Means for solving the problem]

[0010] The extruded cement board of the present invention is an extruded cement board having a plurality of hollow portions arranged in one direction, and is used as a corner member by cutting the widthwise end portion or any portion in the width direction diagonally so that it is inclined relative to the thickness direction in accordance with the corner angle, and is characterized in that when the widthwise end portion or any portion in the width direction is cut diagonally, it has a portion to be cut for corner construction that can maintain the shape of the hollow portion closest to the cut surface in its entirety.

[0011] According to the extrusion molded cement board of the present invention, when the widthwise end or any part in the widthwise direction is cut diagonally, the hollow part closest to the cut surface has a part to be cut for constructing a corner that can maintain its shape intact, eliminating the need for post-processing steps such as backfilling the hollow part and a dedicated jaw for the corner member, thereby preventing an increase in costs. At the same time, because the part to be cut is cut after the extrusion molding and hardening, there is no problem of deformation, and even when it is made into a design panel with ribs, it is possible to manufacture corner members for both inside and outside corners.

[0012] Even in the case of an extrusion molded cement board having convex ribs formed on the surface side, there is no problem of deformation due to the weight of the rib portion during extrusion molding, and a good corner component having ribs can be obtained.

[0013] The hollow portion whose shape is maintained can be the first or second from the end in the width direction of the extruded cement board. For example, if another hollow portion is formed in the portion to be excised, the shape of the second hollow portion from the end will be maintained after the excision. By providing another hollow portion of the required shape, it is possible to improve production efficiency, as described below.

[0014] By setting the inclination angle of the cut surface to 45 degrees based on the front or back surface, the most versatile corner component for constructing a 90-degree corner angle is obtained, allowing the corner structure to be constructed with high precision.

[0015] The corner member of the present invention is a corner member obtained from the above-mentioned extruded cement board, and is characterized in that it has a cut surface at the widthwise end after the portion to be removed has been removed, and the hollow portion closest to this cut surface is maintained in its entirety.

[0016] The corner component of the present invention eliminates the need for post-processing steps such as backfilling of hollows and the need for a dedicated die for corner components, preventing increases in costs. At the same time, problems such as deformation do not occur because the parts to be cut are cut after the extrusion molding and hardening, and even when a design panel with ribs is used, corner components for both inside and outside corners can be manufactured.

[0017] The manufacturing method of a corner member of the present invention is a manufacturing method of a corner member using the above-mentioned extruded cement board, and is characterized in that after the raw material mixture is extruded and hardened to form the extruded cement board, the portion to be cut is cut off to obtain the corner member.

[0018] With the manufacturing method of the corner member of the present invention, after the extrusion molded cement board is molded, the portion to be removed is removed to obtain the corner member, thereby not only eliminating the need for post-processing steps such as backfilling the hollow portion, but also requiring that only the nozzle parts related to the portion to be removed be replaced, thereby preventing the need for large-scale new molding nozzle equipment and the decline in productivity due to the replacement work of molding nozzle equipment during manufacturing, and achieving cost reduction.

[0019] The corner structure of the present invention is a corner structure constructed using the above-mentioned extruded cement board, and is characterized in that the widthwise ends of two extruded cement boards serving as corner members from which the portions to be removed have been cut are butted together at a required angle, and the two corner members are joined to each other.

[0020] According to the corner structure of the present invention, the widthwise ends of two extruded cement boards as corner members from which the portions to be excised have been cut are butted together at a required angle, and the two corner members are joined together, eliminating the need for post-processing steps such as backfilling the hollow portions, thereby preventing increases in costs. Furthermore, the corner structure can be constructed by simply joining the cut surfaces after the portions to be excised have been cut, improving work efficiency.

[0021] The corner structure of the present invention is a corner structure constructed using the above-mentioned extruded cement board, and is characterized in that the widthwise ends of two extruded cement boards serving as corner members from which the portions to be removed have been cut away are butted together at the required angle with a joint gap between them, and the two corner members are attached to a base.

[0022] According to the corner structure of the present invention, the widthwise ends of two extruded cement boards as corner members from which the portions to be excised have been cut are butted together at a required angle with a joint space between them, and the two corner members are attached to the base, eliminating the need for post-processing steps such as backfilling the hollows, preventing increases in costs. Furthermore, the cut surfaces after the portions to be excised can be used as joints to construct the corner structure, improving work efficiency. Effect of the Invention

[0023] According to the present invention, there is no need for post-processing steps such as backfilling of hollows, and no need for a dedicated die for corner components, preventing cost increases. Since the parts to be cut are cut after extrusion molding and hardening, there is no problem with deformation, and even when a design panel with ribs is used, it is possible to manufacture corner components for both inside and outside corners. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is an end view of an extruded cement board according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is an end view of a corner structure constructed using the extruded cement board of FIG. 1. [Diagram 3] FIG. 3 is a perspective view of the corner structure of FIG. 2. [Figure 4] 3 is a perspective view of the corner structure of FIG. 2 seen from a different angle. FIG. [Diagram 5]1(a) is an end view of an extruded cement board according to a second embodiment of the present invention, and (b) is an end view of an extruded cement board according to a third embodiment of the present invention. [Figure 6] 5(a), (b) and (c) are modified examples of ribs etc. corresponding to FIG. 5(a), FIG. 1 and FIG. 5(b), respectively. [Figure 7] 5(a), (b) and (c) are modified examples of the rib corresponding to FIG. 5(a), FIG. 1 and FIG. 5(b), respectively. [Figure 8] 5(a), (b) and (c) are modified examples of the rib corresponding to FIG. 5(a), FIG. 1 and FIG. 5(b), respectively. [Figure 9] 13(a) and 13(b) are end views showing a fourth and fifth embodiment of the present invention in which the portion to be cut off is provided on the fitting recess side. [Figure 10] 13(a) and 13(b) are end views showing sixth and seventh embodiments of the present invention that can be adapted to both protruding corners and recessed corners. [Figure 11] FIG. 11A is an end view showing an eighth embodiment of the present invention in which a portion to be cut is formed on both the mating convex portion side and the mating concave portion side, and FIG. 11B and FIG. 11C are end views showing a ninth and tenth embodiment of the present invention in which a portion to be cut is formed in the center. [Figure 12] 13(a) and 13(b) are end views showing the eleventh and twelfth embodiments of the present invention applied to an extrusion-molded cement board having a smooth surface. [Figure 13] FIG. 12(a) is an end view of a corner structure constructed using FIG. 12(a) or (b). [Figure 14] FIG. 1(a) is an end view showing an example of a accessory member made of a corner member, and FIG. 1(b) is a perspective view of it seen from the inside. [Figure 15] FIG. 1 is an end view showing a conventional example of a corner structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] An embodiment of the present invention will be described with reference to the drawings. The present invention does not involve extrusion molding of a corner component made of an extruded cement board having an inclined portion at the widthwise end, but rather involves extruding an extruded cement board that looks the same as a normal product, and then cutting off a portion of it to obtain a corner component without creating an opening that would appear when part of the hollow portion is missing in the longitudinal direction of the extruded cement board. Figure 1 is an end view of an extruded cement board 1 according to a first embodiment of the present invention.

[0026] The extruded cement board 1 is an exterior material that is attached to the framework of a building by vertical or horizontal laying, and is produced by extruding a mixture of water, cement, aggregate, fiber, etc. with an extruder, curing and hardening it, and then cutting it to a specified size. The extruded cement board 1 has multiple hollow sections with rectangular cross sections that are parallel to each other in the longitudinal direction, which is the extrusion direction.

[0027] The formation of multiple hollow spaces forms multiple partition walls connecting the front side substrate and the back side substrate of the extruded cement board 1. For example, the wall surface of a building is formed by extruded cement boards 1 laid vertically and horizontally. At the corners of a building, two corner members 5 made of extruded cement boards 1 are butted together at a required angle with a joint gap between them, and these are attached to a base material to create a corner structure.

[0028] As shown in Figure 1, a plurality of convex ribs 2 are formed on the front surface side of the extrusion molded cement board 1 of this embodiment. A mating convex portion is formed at one end in the width direction as the male side when mating, and a mating concave portion is formed at the other end as the female side. The multiple hollow portions consist of multiple first hollow portions 3 of the same shape and one second hollow portion 4 close to the end 1a in the width direction. The first hollow portion 3 is a normal rectangular shape, and the second hollow portion 4 is an irregularly shaped hollow portion different from the first hollow portion 3.

[0029] By cutting the widthwise end 1a of the extruded cement board 1 diagonally, it can be used as a corner member 5. The extruded cement board 1 is used as a corner member 5 at the corners of a building, and at the same time, it is highly versatile as it can be used to construct wall surfaces other than corners.

[0030] The extruded cement board 1 becomes a corner component 5 by cutting the widthwise end 1a diagonally so that it slopes inward from the front side where the ribs 2 are located to the back side in accordance with the corner angle when constructing a corner structure. The extruded cement board 1 has a portion 8 to be cut for corner construction that can maintain the second hollow portion 4 closest to the cut surface 7 in its entirety when the widthwise end 1a is cut diagonally along the cutting line 6 shown by the dashed line.

[0031] The section to be cut out 8 has a generally triangular cross section excluding the mating protrusion, and is an area that cuts out one corner of the back surface of the extruded cement board 1. The cut-out section to be cut out 8 has a generally triangular cross section on the outer side from the cutting line 6 in Figure 1, and becomes a columnar shape with the entire length of the extruded cement board 1.

[0032] It is necessary that the second hollow portion 4 located at the extreme end be maintained in its complete shape when the portion to be excised 8 is excised. Therefore, the second hollow portion 4 has a cross-sectional shape that is away from the cutting line 6, and an inclined portion 4a is formed at one corner on the back side, giving it a pentagonal cross-sectional shape. The inclination angle θ of the cutting line 6 along which the portion to be excised 8 is excised, and of the cut surface 7 from which the portion to be excised 8 is excised, is 45 degrees with respect to the front or back surface. This angle is determined because the angle of the corner structure constructed with the corner member 5 is 90 degrees.

[0033] The shape and size of the extrusion molded cement board 1 and the rib 2 are not limited, and the shape and size of the first hollow portions 3, the second hollow portion 4 located at the end, and the shape and size of the portion to be excised 8 are not limited. In this embodiment, the inclination angle of the cutting line 6 is 45 degrees, but it is not limited to this angle, and the inclination angle of the cutting line 6 may be changed according to the angle of the corner structure constructed with the corner member 5. For example, if the corner structure has an acute angle, the inclination angle may be made smaller by making the cutting line more slant than in this embodiment. If the corner structure has an obtuse angle, the inclination angle may be made larger by making the cutting line more steep than in this embodiment. The shapes of the portion to be excised 8 and the second hollow portion 4 are also changed accordingly.

[0034] To manufacture the corner member 5, the extruded cement board 1 is extruded and hardened, and then the portion to be cut 8 is cut off to obtain the corner member 5. The corner member 5 has an inclined cut surface 7 at the widthwise end where the portion to be cut 8 is cut off, and the second hollow portion 4 closest to this cut surface 7 remains intact. The steps after extrusion include primary curing and secondary curing, and when cutting off the portion to be cut 8, it is desirable to do so after the primary curing, normal pressure steam curing, has given the board sufficient handling strength. This is because the board is completely hardened after the secondary curing, autoclave curing, which causes significant wear on the cutting blade and requires more time due to the resistance load during cutting, resulting in poor cutting efficiency.

[0035] Fig. 2 is an end view of a corner structure 10 constructed using the extruded cement board 1 of Fig. 1, Fig. 3 is a perspective view of the corner structure 10 of Fig. 2, and Fig. 4 is a perspective view of the corner structure 10 of Fig. 2 seen from another perspective. The corner structure 10 of this embodiment is a corner structure constructed using a corner member 5 made of an extruded cement board 1, in which cut surfaces 7, 7 that are the widthwise ends of two extruded cement boards as corner members 5 from which the portions to be excised 8 have been removed are butted together at 90 degrees with a joint gap between them, and both corner members 5, 5 are attached to a base.

[0036] To make a corner structure 10 using two corner members 5 as shown in Figure 2, each extruded cement board 1 is cut along cutting line 6 to separate the portions 8 to be removed. At the panel installation site, joints are made in the cut surfaces 7 of each corner member 5, and each corner member 5 is fixed to a base material 11 as shown in Figure 3. This creates an outside corner with a 90-degree corner angle. The joints 12 between the two fixed corner members 5, 5 are filled with a backup material 13 such as urethane foam, a filler 14 such as glass wool, and a sealant 15. Note that in Figures 3 and 4, the Z clips for attaching the extruded cement board to the base and the frame to which the base is attached are omitted.

[0037] The portion 8 to be cut out of the extruded cement board 1 is cut out at an inclination angle of 45 degrees to form the corner member 5, and when the two corner members 5, 5 are combined at their widthwise ends to construct a corner structure 10, the second hollow portion 4 present at the extreme end of the extruded cement board 1 is not exposed. By giving the extruded cement board 1 the above-mentioned shape, it is not necessary to extrude it as a dedicated corner member with one inclined end, and therefore no dedicated molding die equipment is required.

[0038] In conventional molding die equipment, the extrusion molded cement board 1 of this embodiment can be manufactured by replacing only the center ball, which is a die part that forms the hollow shape. Specifically, the center ball that forms the first hollow part 3 out of the multiple hollow parts is used as is, and only the center ball that forms the second hollow part 4 close to the cutting line 6 is replaced and extrusion molded. Therefore, it is possible to manufacture the board by replacing only the minimum number of die parts.

[0039] Since the molding die equipment can be used for both general products and corner products, it is possible to prevent a decrease in productivity due to the replacement of the entire molding die and an increase in costs due to the maintenance and management of the molding die equipment. Also, as mentioned above, when an extruded cement board with ribs formed on the surface is manufactured as a dedicated component for corners with one end inclined, there is a problem that the protruding part deforms downward due to the effect of the weight of the rib part when it is extruded and is not yet hardened, making it difficult to manufacture a dedicated product with ribs.

[0040] In contrast, the extrusion molded cement board 1 having the portion to be excised 8 of this embodiment looks no different from a normal extrusion molded cement board, and there is no protruding portion at the extrusion stage. The portion to be excised 8 that has not been excised exists under the rib 2 close to the cutting line 6, so there is no problem of downward deformation of the rib 2 in the unhardened stage at the time of extrusion, and deformation after extrusion can be prevented.

[0041] According to this embodiment, when the width direction end 1a of the extruded cement board 1 is cut diagonally to produce the corner component 5, the second hollow portion 4 closest to the cut surface 7 has a portion 8 to be cut for constructing the corner that can maintain its shape intact, eliminating the need for post-processing steps such as backfilling the hollow portion and a dedicated jaw for the corner component, thereby preventing an increase in costs. At the same time, because the portion 8 to be cut is cut after the extrusion and hardening, problems such as deformation do not occur, and the corner components 5 for both inside and outside corners can be manufactured.

[0042] Even in the case of an extrusion molded cement board 1 having a convex rib 2 formed on the front surface side, there is no problem of deformation due to the weight of the rib portion during molding, and a good corner component 5 having the rib 2 can be obtained. By setting the inclination angle θ of the cutting line 6 to 45 degrees with respect to the front or back surface, the most general-purpose corner component 5 having a corner angle of 90 degrees can be obtained, and the corner structure 10 can be constructed with high precision.

[0043] In the manufacturing method of the corner member of this embodiment, the raw material mixture is extruded and hardened to form the extruded cement board 1, and then the portion to be removed 8 is removed to obtain the corner member 5. This not only eliminates the need for post-processing steps such as backfilling the hollow portion, but also requires that only the nozzle parts that form the hollow shape be replaced, thereby preventing the need for large-scale new installation of molding nozzle equipment and the decline in productivity that would be caused by the replacement of molding nozzle equipment during manufacturing, thereby reducing costs.

[0044] According to the corner structure 10 of this embodiment, in which the widthwise ends of two extruded cement boards serving as corner members 5 are butted together at a required angle with a joint space between them, and the two corner members 5, 5 are attached to the base, post-processing steps such as backfilling of hollow spaces are unnecessary, preventing an increase in costs. Furthermore, the cut surfaces 7, 7 remaining after the respective portions to be cut 8 of the two corner members 5, 5 are cut off can be used as joints to construct the corner structure 10, improving work efficiency.

[0045] Fig. 5(a) is an end view of the extruded cement board 1 according to the second embodiment of the present invention. This embodiment differs from the above-mentioned embodiment in that a sub-hollow section 17 having a vertically elongated cross section is provided in parallel to the first and second hollow sections 3 and 4 so as to enter the portion to be excised 8 at the side end of the fitting protrusion. The sub-hollow section 17 has the same thickness dimension as the first and second hollow sections 3 and 4 and is formed narrow, so that the extruded cement board 1 can be made lighter when the portion to be excised 8 is not excised and the board is used as a normal exterior wall material. The opening area of ​​the sub-hollow section 17 after the portion to be excised 8 is kept small, eliminating the need for backfilling after the excision.

[0046] In this embodiment, the hollow portion whose shape is maintained is the second hollow portion 4, which is the second from the widthwise end of the extruded cement board 1. When such a sub-hollow portion 17 is formed in the portion to be excised 8, the shape of the second hollow portion 4 is maintained after excision, and the portion to be excised 8 is reduced, thereby reducing the amount of waste.

[0047] Fig. 5(b) is an end view of an extruded cement board 1 according to a third embodiment of the present invention. This embodiment differs from the first embodiment in that a sub-hollow section 18 having a triangular cross section is provided in the portion 8 to be cut at the end on the side of the fitting protrusion, parallel to the first and second hollow sections 3 and 4. The entirety of this sub-hollow section 18 is formed in the portion to be cut 8. An inclined section 18a, which is one side of the sub-hollow section 18, is located on the cutting line 6, so that a crosspiece section 19 forming the boundary between the sub-hollow section 18 and the second hollow section 4 has an inclined shape.

[0048] The inclined portion 18a, which is one side of the sub-hollow portion 18, is located on the cutting line 6, and the crosspiece portion 19, which forms the boundary between the sub-hollow portion 18 and the second hollow portion 4, is inclined, so that the resistance load of the circular saw when cutting the portion to be cut 8 is reduced, making cutting easier. The only portions to be cut are the vertical substrate portion e on the upper end side of the sub-hollow portion 18 and the back substrate portion u, which greatly reduces the cutting load, and can significantly improve production efficiency. Furthermore, by providing the sub-hollow portion 18 of this embodiment, the weight of the extruded cement board 1 can be reduced when the portion to be cut 8 is not cut and the board is used as a normal exterior wall material, etc.

[0049] The inclined portion 18a, which is one side of the sub-hollow portion 18, does not have to be on the cutting line 6. The sub-hollow portion 18 may be deformed or the position of the sub-hollow portion 18 may be changed to position the inclined portion 18h on the inner side of the cutting line 6 as shown by the broken line in FIG. 5(b). The inclined portion 18h is positioned on the inner side of the cutting line 6, and the cutting line 6 and the crosspiece 19 are slightly spaced apart. If the distance t between the cutting line 6 and the crosspiece 19 is 5 mm or less, there is no problem in the construction of the non-combustible material to be filled in the joint to ensure fire resistance. Positioning the inclined portion 18a of the sub-hollow portion 18 on the cutting line 6 makes it easier to manufacture in terms of processing accuracy because it is not necessary to necessarily match the inclined portion 18a and the cutting line 6.

[0050] As described above, in this embodiment, a sub-hollow section 18 having an angular cross-section parallel to the first and second hollow sections 3 and 4 is formed in the portion to be resected 8, and the inclined portions 18a and 18h, which are one side of this sub-hollow section 18, are located on the cutting line 6 of the portion to be resected 8 or on the inner side of the cutting line 6.

[0051] The sub-hollow portion is not limited to a triangular cross-sectional shape as long as it is angular, and the inclined portion along the cutting line 6 may have a length sufficient to reduce the cutting load. The inclined portion of the sub-hollow portion is preferably completely aligned with the cutting line, but may be inclined relative to the cutting line. The degree of reduction in resistance load during cutting varies depending on the shape and size of the sub-hollow portion. If the cross-sectional spatial distance n relative to the cross-sectional cutting distance m is about 30% or more, a sufficient reduction in resistance load can be obtained.

[0052] In this embodiment, the hollow portion whose shape is maintained is the second hollow portion 4, which is the second from the widthwise end of the extruded cement board 1. When such a sub-hollow portion 18 is formed in the portion to be excised 8, the shape of the second hollow portion 4 is maintained after excision, and the portion to be excised 8 is reduced, thereby reducing the amount of waste.

[0053] The extrusion molded cement board of the present invention is not limited to the above-mentioned form, and can be applied to various other design panels and flat panels. Figures 6(a), (b) and (c) show modified examples of ribs etc. corresponding to Figures 5(a), 1 and 5(b), respectively. In these examples, two types of first hollow parts 3A and 3B, large and small, are provided, and a rib hollow part 21 is formed inside the rib corresponding to the smaller first hollow part 3B.

[0054] Figures 7(a), (b) and (c) show modified ribs corresponding to Figures 5(a), 1 and 5(b), respectively. In these examples, wavy ribs 22 are formed on the surface of the extruded cement board 1. Figures 8(a), (b) and (c) show modified ribs corresponding to Figures 5(a), 1 and 5(b), respectively. In these examples, low ribs 23 that are lower than those in the first embodiment are formed on the surface of the extruded cement board 1.

[0055] Figures 9(a) and (b) are end views showing fourth and fifth embodiments of the present invention in which the portion to be excised 8 is provided on the fitting recess side. In these embodiments, the portion to be excised 8 and the irregularly shaped second hollow portion 4 are provided on the fitting recess side. In the extrusion molded cement board 1 of the fourth embodiment in Figure 9(a), a sub-hollow portion 17 having an elongated cross section like that of the second embodiment is provided on the fitting protrusion side. In the extrusion molded cement board 1 of the fifth embodiment in Figure 9(b), the surface is flat with no ribs.

[0056] 10(a) and 10(b) are end views showing the sixth and seventh embodiments of the present invention, which are applicable to both outside and inside corners. In the above embodiments, the corner member 5 obtained is for outside corners, but the extruded cement board 1 of this embodiment can be used to produce the corner member 5 for inside corners.

[0057] For example, in the above-mentioned extrusion molded cement board 1 of the first embodiment shown in Fig. 1, to make it into a corner component for an inside corner, the width direction end 1a can be cut obliquely so that it inclines inward from the back side to the front side according to the corner angle. The cutting line at this time is opposite to that of the first embodiment. Accordingly, the shape of the second hollow portion is also changed.

[0058] 10(a) and 10(b) of the sixth and seventh embodiments of the extrusion molded cement board 1 have two crossed cutting lines 6, 25 on the mating convex portion side, one cutting line 6 is for an outside corner portion, and the other cutting line 25 is for an inside corner portion. The second hollow portion 4 has a shape corresponding to both the cutting lines 6, 25 for the outside corner portion and the inside corner portion, and the second hollow portion 4 has two inclined portions 4a, 4b formed therein.

[0059] Fig. 11(a) shows an eighth embodiment of the present invention in which a portion to be cut 8 is formed on both the fitting convex portion side and the fitting concave portion side. The second hollow portions 4 on the fitting convex portion side and the fitting concave portion side respectively have shapes corresponding to the portion to be cut 8. Figs. 11(b) and (c) are end views showing ninth and tenth embodiments of the present invention in which the portion to be cut 8 is formed in the center in the width direction to obtain a corner member 5 having a width other than the standard width.

[0060] In the ninth embodiment of Fig. 11(b), a portion to be excised 8 is formed in the widthwise center of the extruded cement board 1, and two cutting lines 6 and second hollow portions 4 are provided corresponding to the portion. In the tenth embodiment of Fig. 11(c), three portions to be excised 8 are formed at both ends and the center of the extruded cement board 1 in the widthwise direction, and four cutting lines 6 and second hollow portions 4 are provided corresponding to the portions. In this way, the portions to be excised 8 can be provided not only at the widthwise ends of the extruded cement board 1, but also at any portion in the widthwise direction, such as the widthwise center.

[0061] When manufacturing corner members of a width other than the standard width, if there are not enough pieces to prepare a dedicated forming die, the portion to be cut 8 can be provided in the center in the width direction as in the ninth and tenth embodiments of Figures 11(b) and (c), and two corner members 5, 5 can be manufactured from one extruded cement board 1. This makes it possible to manufacture corner members 5 that are shorter than the standard width without preparing a dedicated forming die. Since the portion to be cut 8 is also formed in the center in the width direction, excess waste is generated, but since a dedicated forming die is not required, costs do not increase.

[0062] Figures 12(a) and (b) are end views showing 11th and 12th embodiments in which the present invention is applied to an extruded cement board with a smooth surface, and Figure 13 is an end view of a corner structure 26 constructed using the extruded cement board 1 of Figure 12(a) or (b). A back-up material 13 made of urethane foam or the like, a filler 14 such as glass wool, and a sealant 15 are filled in a joint 12 between two fixed corner members 5, 5.

[0063] Two corner components can be integrated in advance at a factory or the like to form a corner accessory component. Fig. 14(a) is an end view showing an example of an accessory component 30 made of corner components 5, and (b) is a perspective view seen from inside. An extruded cement board 1 having a portion 8 to be cut out formed in the widthwise center thereof, as shown in Fig. 11(b) or (c), is used. Such an extruded cement board 1 is cut along two cutting lines 6, 6 in the widthwise center thereof, and the portion 8 to be cut out in the center is separated. The cut surfaces 7, 7 of the two corner components 5, 5 are then bonded together with an adhesive such as epoxy resin.

[0064] After that, a plate or angle 31 is bolted 32 to the inside of the corner of the two corner members 5, 5 that are attached at a 90-degree angle to reinforce them and form the accessory member 30. With this configuration, even when using a type of panel such as a design panel whose width direction end cannot be formed at a 45-degree angle, it is possible to omit the work of backfilling the cut portion, thereby reducing the work time and cost required for this work.

[0065] The present invention is not limited to the above-mentioned embodiments and examples. The disclosed embodiments and examples are examples of the extruded cement board, corner member, manufacturing method of the corner member, and corner structure according to the present invention, and are not restrictive. The form of various mounting structures of the extruded cement board to the framework, etc. is not limited.

[0066] The present invention is used not only for the exterior walls of buildings but also for the interior walls. The number, shape, and arrangement of the hollow parts and ribs of the extruded cement board are not limited as long as they do not impair the effects of the present invention, and the process used in the manufacturing method of the corner members and other members provided as necessary to construct the corner structure may be of any form as long as they do not impair the effects of the present invention. [Explanation of symbols]

[0067] 1. Extruded cement board 2 Ribs 3 1st hollow part 4 2nd hollow part 4a, 4b Slope 5 Corner parts 6, 25 Cutting line 7 Cut surface 8 Area to be resected 10, 26 corner structure 11 Base material 12 Joint 13 Back-up material 14 Glass wool 15 Sealing materials 17, 18 Sub-hollow section 18a, 18h Slope section 19 Cross section t Distance between cutting line and rung m cutting distance n spatial distance 21 Rib Hollow Section 22 Wavy Ribs 23 Low Rib 30 Accessories 31 Angle 32 Volts

Claims

1. An extruded cement board having a plurality of hollow portions arranged in one direction, and used as a corner member by cutting out the widthwise end portion or any widthwise portion obliquely so as to be inclined with respect to the thickness direction in accordance with the corner angle, This extruded cement board is characterized by having a planned cutting portion for corner construction that allows the hollow portion closest to the cut surface to be maintained intact when the widthwise end or any portion in the widthwise direction is cut diagonally.

2. 2. The extruded cement board according to claim 1, wherein convex ribs are formed on the surface side.

3. 3. The extruded cement board according to claim 1, wherein the hollow portion whose shape is maintained is the first or second hollow portion from the end in the width direction of the extruded cement board.

4. 3. The extrusion molded cement board according to claim 1, wherein the inclination angle of the cut surface is 45 degrees with respect to the front or back surface.

5. A corner member obtained from the extruded cement board according to claim 1 or 2, A corner member characterized in that it has a cut surface at the widthwise end after the portion to be cut has been cut, and the hollow portion closest to this cut surface is maintained in its entirety.

6. A method for manufacturing a corner member using the extruded cement board according to claim 1 or 2, A method for manufacturing a corner member, comprising extruding a raw material mixture, hardening the mixture to form the extruded cement board, and then cutting out the portion to be cut out to obtain the corner member.

7. A corner structure constructed using the extruded cement board according to claim 1 or 2, A corner structure constructed using extruded cement boards, characterized in that the widthwise ends of two extruded cement boards serving as corner members from which the portions to be removed have been cut are butted together at the required angle, and the two corner members are joined together.

8. A corner structure constructed using the extruded cement board according to claim 1 or 2, The corner structure constructed using extruded cement boards is characterized in that the widthwise ends of two extruded cement boards serving as corner members from which the portions to be removed have been removed are butted together at the required angle with a joint gap between them, and the two corner members are attached to the base.

9. A molding die equipment used to manufacture the extrusion molded cement board according to claim 1 or 2, This molding nozzle equipment is characterized in that, of the multiple hollow portions of the extruded cement board, the inner balls that form hollow portions other than the hollow portion closest to the cut surface can be used as they are, and only the inner ball that forms the hollow portion closest to the cut surface can be replaced.

Images