JP2007038666A - Manufacturing method of building member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a building member which enables the manufacture of the building member having rigidness, high mechanical strength and a small scatter of the strength by compressing a lumen of a cell of a bamboo or a natural fiber to increase the density, facilitates control with an excellently stable quality, in a small number of requirements such as a temperature of a mold, pressure and the like required for the quality control, shows an excellent mass productivity with a short treating time and switching time for every batch, and improves rot resistance. <P>SOLUTION: The invention is related to the manufacturing method of the building material such as a rod-like member having an approximately circular, approximately elliptical or approximately polygonal cross-section and molded into a linear, curved or bent shape. The method has a molded body forming process of forming a molded body by housing a plurality of bamboo pieces made by removing a skin of the bamboo material and/or a natural fiber and an adhesive agent in a cavity of the mold, and compression-molding the bamboo pieces and the natural fiber in the clamped and hot mold. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is embedded between structural members for the purpose of joining structural members such as beams and eaves girders, eaves girders and columns, torso and through columns, columns and columns for the purpose of labor saving and rationalization of buildings such as houses. It is related with the manufacturing method of building members, such as a bamboo reinforcing rod, which are embed | buried and used for the purpose of reinforcement | strengthening of frames, such as a joint tool used and concrete.

Conventionally, for the purpose of labor saving and rationalization of construction of houses, etc., it is buried between joint members for the purpose of joining structural members such as beams and eaves girder, eaves girder and column, girder and through column, column and column Have been developed. Such a connector is known, for example, as described in JP-A-5-331919. However, because it is made of metal or synthetic resin and is hard, it is difficult to cut with a saw or chain saw when dismantling the building, and it is difficult to reuse and recycle parts because separation is necessary. Had.
2. Description of the Related Art In recent years, a connector has been developed that includes a rod-shaped member made of bamboo and a hollow portion for inflow of an adhesive that is formed in the longitudinal direction of the rod-shaped member and opens at both ends of the rod-shaped member. This connector is inserted into a pair of communicating holes drilled in the contact surface of the structural member, and an adhesive is injected into the hollow portion for injecting the adhesive so as to overflow between the communicating hole and the rod-shaped member. Filling and curing the adhesive in the communication hole to join the structural members. Bamboo has high rigidity, high repulsive force, toughness, low stretchability, and excellent splitting properties, so it can manufacture joints with excellent mechanical properties, and can be used with a saw or chain saw when dismantling a building. It has the characteristics that it can be easily cut, and no separation is required, so that it is easy to reuse and recycle parts.
Conventionally, for the purpose of saving steel materials, bamboo reinforced concrete reinforced with bamboo instead of reinforced concrete has been studied.

However, there is a problem that the mechanical strength such as bending strength is extremely low for building members embedded in structural members such as bamboo joints and bamboo rebars compared to metal joints and rebars. was there. In addition, since bamboo has a high density of fibers near the outer skin and there are variations in the density of the fibers, there is a problem that bamboo joints and bamboo bars tend to have variations in mechanical strength.
As a conventional technique for solving these problems, (Patent Document 1) states that “a long divided bamboo material obtained by dividing the bamboo material into a plurality of circumferential directions is subjected to a flexible treatment such as boiling, and then compressed to be extremely fine. There is disclosed a “pressure forming method using bamboo as a raw material” in which a bamboo material is formed, and a resin is added to the ultra fine bamboo material and pressed into a rod shape.
(Patent Document 2) “a single plate laminated structure is formed by laminating a predetermined number of cut single plates with an adhesive interposed therebetween, and this single plate laminated structure is placed in a high temperature and high pressure steam atmosphere in a high temperature and high pressure vessel. In this state, after applying heat and softening with high-temperature and high-pressure steam, a mechanical compressive force is applied to the single-plate laminated structure so that each single-plate laminated structure has a cross-sectional area ratio of about 1/2 to 1/3. There is disclosed a method for producing a reinforced laminated wood in which compression molding is performed and then deformation due to compression molding of a single-plate laminated structure is fixed in an atmosphere of high-temperature and high-pressure steam.
JP 7-285105 A JP-A-5-77203

However, the above conventional techniques have the following problems.
(1) The technology disclosed in (Patent Document 1) increases the density of fibers with a small compression ratio because it is difficult to soften the bamboo material structure because it is not heated when a resin is added to the ultra-fine bamboo material and pressed. However, the obtained molded article had a problem that the mechanical strength was low and the variation was large.
(2) In the technique disclosed in (Patent Document 2), a single-plate laminated structure is placed in a high-temperature / high-pressure steam atmosphere in a high-temperature / high-pressure vessel and softened by heat, and compression-molded in the high-temperature / high-pressure vessel. The inner cavity of each veneer is made smaller, and hard wood with high mechanical strength can be obtained. However, since a high-temperature and high-pressure vessel is required, the equipment is enlarged and enormous capital investment is required. The operation is complicated, and the number of conditions necessary for quality control such as the temperature and pressure in the high-temperature and high-pressure vessel, the temperature of the mold for compression molding, etc. is complicated and the quality control becomes difficult. It was.
(3) The single-plate laminated structure is heated and softened in a high-temperature and high-pressure vessel with high-temperature and high-pressure steam, then compression-molded, and then the shape of the compressed single-plate laminated structure is fixed. The processing time was long and lacked mass productivity. In addition, there is a problem that vapor hardly penetrates into the central part of the single-plate laminated structure, and a difference in pressure density occurs between the outer peripheral part and the central part of the single-plate laminated structure, which easily causes product spots.
(4) When one batch processing is completed, the high-temperature and high-pressure vessel is degassed, the high-temperature and high-pressure steam is removed, the high-temperature and high-pressure vessel is opened, the compression-molded single-plate laminated structure is taken out, and then a new single-plate laminated structure Since the high-temperature and high-pressure vessel in which the temperature has decreased must be filled again with high-temperature and high-pressure steam after the container is placed in the high-temperature and high-pressure vessel, it takes time to heat and cool the high-temperature and pressure vessel, resulting in a lack of mass productivity. Had.

  The present invention solves the above-described conventional problems, and can produce a building member that is hard and has high mechanical strength and small strength variation, and is managed with a small number of conditions necessary for quality control such as temperature and pressure of a mold to be molded. An object of the present invention is to provide a method for producing a building member that is easy to achieve, excellent in quality stability, short in processing time and switching time for each batch, excellent in mass productivity, and further improved in decay resistance.

In order to solve the above-mentioned conventional problems, the method for manufacturing a building member of the present invention has the following configuration.
The method of manufacturing a building member according to claim 1 of the present invention includes a bar-like member having a cross-section that is formed into a linear shape, a curved shape, or a bent shape having a substantially circular shape, a substantially elliptical shape, or a substantially polygonal shape. A method of manufacturing a building member, wherein a plurality of bamboo pieces and / or natural fibers and an adhesive are removed from a bamboo material in a mold cavity, and the bamboo pieces are stored in the mold at a high temperature which is clamped. And / or it has the structure provided with the molded object formation process which compression-molds the said natural fiber and forms a molded object.
With this configuration, the following effects can be obtained.
(1) Since bamboo pieces and natural fibers are heated and pressurized together with an adhesive in the mold cavity, the water contained in the bamboo pieces and the adhesive evaporates and the water vapor fills the cavity. Bamboo pieces and other tissues are softened. Furthermore, the cell lumen is compressed to increase the density, and it is possible to produce a building member that is hard and has high mechanical strength and small strength variation.
(2) Since molding is performed in the mold cavity, a large-scale high-temperature and high-pressure vessel is not required, and it can be manufactured with a commercially available press. It is easy to manage and has excellent quality stability.
(3) Since bamboo pieces and natural fibers are molded in a small-cavity, after a single batch process is completed, the cavity can be brought into a predetermined molding atmosphere in a short time. Processing time and changeover time are short and excellent in mass productivity.
(4) Since the bamboo piece from which the skin (outer skin and inner skin) of the bamboo material is removed is used, a compacted compact with high adhesive bonding between the bamboo pieces and high mechanical strength can be obtained. If the bamboo skin is still attached, the skin may crack and crack when compressed, or may peel off in layers on the adhesive surface of the skin, resulting in low mechanical strength and lack of reliability. .
(5) When bamboo pieces and natural fibers are filled with high-temperature and high-pressure steam in a sealed cavity, hemicellulose and lignin contained in the bamboo pieces and natural fibers are partially depolymerized. A phenol compound, a furfural compound, etc. with the property which inhibits the growth of potato are produced, and the decay resistance of a building member is improved.

  Here, as the building member, a rod-like member, a tubular body, a plate-like body, or the like formed in a substantially circular shape, a substantially elliptical shape, or a substantially polygonal shape such as a substantially triangular shape, a substantially rectangular shape, or a substantially hexagonal shape is used. It is done. These building members can be used for joints that join between structural members that have hollows for inflow of adhesive that open at both ends of a bar-shaped member, concrete reinforcing members, pillar materials such as fences, building materials, etc. it can. Especially, it is used suitably for a connector and a concrete reinforcement member (bamboo rebar). This is because the building member of the present invention has a high tensile strength, and thus satisfies the required characteristics of a connector and a concrete reinforcing member that require high tensile strength.

Bamboo such as bamboo, bee, mosouchiku, kurochiku, medaka, and bamboo such as nezasa, suzuda, yamatake, kumazasa are used as the bamboo material.
As the bamboo pieces, those obtained by cutting a cylindrical bamboo material slightly shorter than the length of the rod-shaped member of the target building member and further dividing the vertical bamboo portion into about 8 to 16 are used. Furthermore, what was cut | disconnected shortly, and the hook-shaped thing divided | segmented further finely can also be used. When the length of one bamboo piece is shorter than the length of the bar-shaped member of the building member, when the bamboo piece is accommodated in the cavity, it can be laminated while being alternately shifted to produce a long shaped body. .
Bamboo may be used avoiding the nodes, or may be used by removing the nodes and cutting the protrusions of the nodes. By using a long piece of bamboo manufactured from bamboo material with the knot projections cut off, a long shaped article can be produced.

As natural fibers, fibers extracted from plant-based materials such as hemp such as bamboo, kenaf, flax, manila hemp, choma and jute, sugar cane, corn, banana and cotton are used. Among these, bamboo fiber is preferably used. This is because the mechanical strength is high. The method for taking out the fiber from the plant-based material is not particularly limited. For example, in kenaf, hemp, sugarcane, corn, banana, etc., the stem (bast) is immersed in a pond or swamp, etc., and the parts other than fiber (mainly pectin) are decomposed into bacteria. The method of taking out the fiber is mentioned. In the case of bamboo, the bamboo piece is made into a fibrous form by using any pressing means such as a roller or a press, or the bamboo material in a high-temperature and high-pressure state is abruptly brought to normal pressure to explode into a fibrous form. A method is mentioned. In the case of cotton, there is a method of collecting as fruit. Moreover, fiber yarns, such as a pulp of plant raw material, cellulose rayon fiber yarn using a plant raw material, and a cellulose fiber yarn, can also be used. These natural fibers are preferably braided, twisted or sliver-shaped. This is because the discontinuous fibers can be made continuous, the mechanical strength of the building member can be increased, and the handleability is excellent.
When accommodating bamboo pieces or natural fibers in the cavity, the fiber direction of the bamboo pieces or natural fibers is made to substantially coincide with the longitudinal direction of the bar-like member of the target building member. This is to increase the mechanical strength such as the bending strength of the rod-shaped member.

Bamboo pieces and natural fibers are contained in bamboo pieces and natural fibers when they are manufactured from bamboo materials that have just been cut out. As the water evaporates and the bamboo pieces and natural fibers in the cavities are filled with high-temperature and high-pressure steam, the heat of the cavity forming surface is well transferred to the bamboo pieces and natural fibers, and the bamboo pieces and natural fibers are easily softened and easily compressed. Is done.
In addition, when using dried bamboo or natural fibers, the bamboo pieces or natural fibers are immersed in water or sprayed on the natural fibers before they are accommodated in the cavity. It is preferable to keep it. This is because the softening of bamboo pieces and the like is promoted to prevent cracking due to compression molding. Also, when storing bamboo pieces or natural fibers in the cavity, a small amount of water is put into the cavity together, or a hole communicating with the cavity is formed in the mold, and the mold is made using this hole. It is also possible to supply water vapor into the cavity from the outside.
Bamboo pieces and natural fibers can be preheated before being housed in the mold. This is preferable because the heating time of bamboo pieces and natural fibers in the mold can be shortened and productivity can be increased.

  The bamboo skin (outer skin and inner skin) can be ground by sander or removed by blasting or the like. After the bamboo material is divided, these skins can be treated or in a round bamboo state. By removing the skin, it is possible to obtain a molded article having high adhesive bondability between bamboo pieces and high mechanical strength.

  As the adhesive, isocyanate adhesive, phenol adhesive, tannin, lignophenol, polylactic acid resin, or the like can be used. The isocyanate-based adhesive may be any adhesive having two or more isocyanate groups in one molecule. For example, TDI (toluene diisocyanate), MDI (diphenylmethane diisocyanate), triphenylmethane triisocyanate, polymeric MDI (polymethylene polyisocyanate). Phenyl isocyanate) and the like. These adhesives can be attached to bamboo pieces and the like by any method such as application such as brush coating, spraying, and soaking.

As the cavity, those formed substantially the same as or larger than the outer shape of the bar-shaped member of the building member are used. When the cavity is formed larger than the outer shape of the bar-shaped member of the building member, the compression-molded molded body is taken out from the mold and then cut according to the outer shape of the target bar-shaped member.
In addition, by using a mold having irregularities on the cavity forming surface, it is possible to form irregularities on the surface of a building member manufactured as a joint for use by injecting an adhesive or bamboo reinforcement for concrete reinforcement. It is preferably used because it improves the adhesion of adhesives and concrete.
Building materials include oil-based preservatives such as creosote oil, oil-soluble preservatives such as tribromophenol, 3-iodo-provinylbutyl carbonate and copper naphthenate, water-soluble preservatives such as CCA preservatives, and emulsification. Preservative treatment with an organic preservative; insecticide treatment with boron compounds such as sodium borate tetrahydrate, carbamate compounds such as carbaryl and propoxur, pyrethroid compounds such as permethrin and cypamethrin, and organophosphorus compounds such as chlorpyrifos A light stabilization treatment with an ultraviolet absorber such as benzotriazole, benzophenone, salicylate, or cyanoacrylate is preferable. This is because the building member may be left outdoors when it is used as a bamboo reinforcement for concrete reinforcement.

The temperature in the high-temperature cavity when the mold containing the bamboo pieces or natural fibers is clamped is 100 to 180 ° C, preferably 130 to 150 ° C. As the temperature drops below 130 ° C, the amount of water evaporation is small and the water vapor pressure in the cavity is difficult to increase, and it takes a long time for the bamboo pieces and natural fibers to soften. There is a tendency for strength spots and cracks to occur easily on the molded body, and as the temperature rises above 150 ° C, the bamboo piece cracks and cellulose decomposes, causing browning and scoring, resulting in a decrease in mechanical strength. There is a tendency to In particular, when the temperature is lower than 100 ° C. or higher than 180 ° C., these tendencies become remarkable, so that neither is preferable.
The mold can be heated by a Joule heat by generating an eddy current in the mold by high frequency induction heating, electromagnetic induction heating or the like in addition to heating by a heater or the like.

By heating and clamping the mold, the temperature of the bamboo pieces and the like rises, and water vapor penetrates into the bamboo pieces and softens. The softened bamboo pieces and the like are compression-molded in the cavity until the cross-sectional area ratio is about 1/2 to 1/3, and at the same time, the adhesive is thermally cured to bond the bamboo pieces and the like. By holding in this state for about 1 to 60 minutes, the shape of the molded body is fixed. The reason why the bamboo pieces are compression-molded until the cross-sectional area ratio is about 1/2 to 1/3 is to increase the density.
In addition, although it depends on the temperature of the cavity, 1-15 MPa, preferably 5-10 MPa is suitably used as the compression molding pressure for molding bamboo pieces and the like. As the pressure becomes smaller than 5 MPa, there is a tendency that it becomes difficult to produce a high-density molded body with a small amount of compression, and as the pressure becomes larger than 10 MPa, the fibers are pressed and cut to tend to decrease the mechanical strength. In particular, when the pressure is smaller than 1 MPa or higher than 15 MPa, these tendencies become remarkable, so that neither is preferable.

In addition, a mold is used by using means such as providing an air vent hole or a gap in the cavity so that the vapor pressure in the cavity when compression molding is 120 to 2500 kPa, or connecting a safety valve to the air vent hole formed in the cavity. Is preferably designed. When a plurality of cavities are formed, the cavities can be connected by piping or the like, and a safety valve can be provided in the connected piping or the like.
As the vapor pressure in the cavity becomes lower than 120 kPa, water vapor hardly penetrates into the bamboo pieces and natural fibers, and the bamboo pieces and natural fibers tend to be softened. Since there is no change in the time until softening and the structure for sealing the inside of the cavity tends to be complicated, neither is preferable.
If the mold is detachable from the pressure molding apparatus, after compression molding, the mold is removed from the pressure molding apparatus and cooled, and another mold is used as the pressure molding apparatus. Since it can be attached and compression molded, the occupation time of the pressure molding apparatus during cooling can be shortened, the molding cycle of the pressure molding apparatus can be shortened, and the productivity is excellent.

The method for manufacturing a building member according to claim 2 of the present invention is a rod-shaped member whose cross section is formed in a linear shape, a curved shape, or a bent shape in any of a substantially circular shape, a substantially elliptical shape, or a substantially polygonal shape, A hollow member that opens at the center portion of the rod-like member in parallel with the longitudinal direction or at both ends or at one end thereof, wherein the hollow portion of the building member is disposed in the longitudinal direction. A plurality of bamboo pieces and / or natural fibers and adhesives, from which the skin of the bamboo material has been removed, are accommodated in the mold cavity in which the ridges forming the halved grooves are formed on the cavity forming surface, A half-molded body forming step of compression-molding the bamboo pieces and / or the natural fibers in the mold that has been clamped to form a half-molded body in which the grooves are formed, and from within the mold After taking out the half molded body, the groove portions of the two half molded bodies And it has a configuration including, a bonding step of bonding together the Judges.
With this configuration, in addition to the operation of the first aspect, the following operation can be obtained.
(1) Since the bamboo pieces and natural fibers are heated and pressurized together with the adhesive in the mold cavity, the water contained in the bamboo pieces, natural fibers and adhesive is evaporated and the water vapor is filled in the cavity and heated. The structure of bamboo pieces and natural fibers is softened by water vapor. Furthermore, the cell lumen is compressed to increase the density, and a halved molded body in which a groove is formed by a protrusion formed on the cavity forming surface can be formed. By bonding the groove portions of the two halved molded bodies together, it is possible to manufacture a hard building member having a hollow portion, high mechanical strength, and small strength variation.

  Here, the building material, bamboo, bamboo, natural fiber, adhesive, temperature in the mold, pressure at the time of molding, and vapor pressure in the cavity at the time of compression forming are the same as those described in claim 1 Therefore, explanation is omitted.

As the cavity forming surface, one surface can be formed into a flat surface, and the other surface can be formed into a concave shape corresponding to the shape of the outer peripheral surface of the bar-shaped member of the building member. Further, the outer surface of the half-shaped product can be cut after the half-shaped product formed on the surface larger than the outer peripheral surface of the bar-shaped member of the building member is taken out from the mold.
Corresponding to the shape of the groove part that halves the hollow part of the building member along the longitudinal direction, the ridge part is coupled with the entire length in parallel with the longitudinal direction of the cavity or with both ends or one end of the cavity. And what was formed in the ridge is used.

  Adhesives that bond the half-formed product in the bonding process include polyvinyl acetate, ethylene-vinyl acetate copolymer, urea resin, melamine resin, phenol resin, resorcinol resin, vinyl urethane, polyurethane, cyanoacrylate, tannin, rig Phenol or the like can be used.

The method for manufacturing a building member according to claim 3 of the present invention is a rod-shaped member having a cross section formed in a linear shape, a curved shape, or a bent shape in any of a substantially circular shape, a substantially elliptical shape, or a substantially polygonal shape, A hollow member that is formed in the longitudinal direction of the rod-shaped member and opens at both ends of the rod-shaped member, and a method for producing a building member, wherein a plurality of bamboo pieces and / or natural fibers from which the skin of the bamboo material has been removed The adhesive is accommodated in the mold, and the core material forming the hollow portion of the building member is disposed at the approximate center of the bamboo piece and / or the natural fiber, and the mold is clamped in the high-temperature mold. It has the structure provided with the hollow molded object formation process which compression-molds a bamboo piece and / or the said natural fiber, and forms the hollow molded object in which the said hollow part was formed.
With this configuration, in addition to the operation of the first aspect, the following operation can be obtained.
(1) Since the core material is accommodated in the cavity and molded together with bamboo pieces and the like, a building member having a hollow portion can be manufactured by a single molding operation and is excellent in productivity.

  Here, the building member, hollow part, bamboo material, bamboo piece, natural fiber, adhesive, temperature in the cavity, pressure in the cavity, and pressure at the time of molding are the same as those described in claim 1, so the description is omitted. To do.

As the core material, those formed in a solid rod shape, a hollow tubular shape or the like corresponding to the shape of the inner peripheral surface of the hollow portion of the target building member are used.
When the rod-shaped member is linear, a linear core material is used. When the rod-shaped member is curved with a small curvature, a curved core is used, but when the rod-shaped member is curved or bent with a large curvature, it is detachably connected at the bent or curved portion of the rod-shaped member. Used core material is used. Thereby, a core material can be decomposed | disassembled and can be extracted from a hollow part after shaping | molding.

Invention of Claim 4 of this invention is a manufacturing method of the building member of Claim 3, Comprising: The said metal mold | die has the movable side metal mold | die which has the core material pressing part which pushes down the both ends of the said core material at the time of shaping | molding, A fixed side mold having a guide groove that communicates with both ends of the cavity and is formed in a long hole shape in the same direction as the movable direction of the movable mold, and through which both ends of the core material are inserted. Have.
With this configuration, in addition to the operation obtained in the third aspect, the following operation can be obtained.
(1) Since the fixed side mold is provided with guide grooves communicating with both ends of the cavity, and the movable side mold is provided with a core material pressing portion that presses down both ends of the core material during molding, the core material is moved as the movable side mold moves. Can be pressed down, so that a hollow molded body having a substantially uniform density and high mechanical strength such as bending strength can be produced.

  Here, as the guide groove, one having a groove width that is substantially the same as or slightly larger than the outer diameter of the core material is used. This is to prevent water vapor or adhesive from leaking out of the cavity from the gap between the guide groove and the core material. Moreover, a sealing material can be arrange | positioned so that a clearance gap may be eliminated.

  As the core material pressing part, one that presses down the core material to a position corresponding to the hollow part of the compressed molded body is used.

Invention of Claim 5 of this invention is a manufacturing method of the building member of Claim 3 or 4, Comprising: As for the said core material, the hole part through which 1 or more types of water vapor | steam and a cooling fluid pass is in a surrounding wall. It has the structure formed with the formed hollow tube.
With this configuration, in addition to the operation obtained in the third or fourth aspect, the following operation can be obtained.
(1) Since the core material is formed of a hollow tube having a hole in the peripheral wall, high-temperature and high-pressure steam is injected from the core material into the mold before molding, so that the bamboo pieces are softened in a short time. Can be highly productive. In addition, after forming the hollow molded body, by injecting a cooling fluid such as cold air or cold water from the core material, it can be cooled from the inside of the hollow molded body and the cooling time can be shortened. The core material can be easily removed from the molded body, and the productivity is excellent.

  Here, it is preferable that a pipe provided with a switching valve is connected to the core material so that it is possible to select which of water vapor and cooling fluid to flow through the core material.

Invention of Claim 6 of this invention is a manufacturing method of the building member of any one of Claim 3 thru | or 5, Comprising: The said bamboo piece and / or the said natural fiber are synthetic resin, inorganic fiber, One or more of woven fabric, knitted fabric, non-woven fabric, and sheet formed with one or more of them and the adhesive is wound around the core material, or the fiber yarn and the adhesive using the bamboo material as a raw material Is wound around the core material.
With this configuration, in addition to the action obtained in any one of claims 3 to 5, the following action is obtained.
(1) Bamboo and natural fibers are strong, so when they are molded under high pressure, the fibers may be pressed together and cut off the fibers, resulting in a decrease in mechanical strength. However, they are made of synthetic resin or inorganic fibers. Since it is wound with woven fabric, knitted fabric, non-woven fabric, sheet, or wound as fiber yarn made of bamboo, synthetic resin or inorganic fiber buffers between bamboo fiber and natural fiber. The fiber can be prevented from being cut off, and the mechanical strength can be prevented from decreasing.

Here, as the synthetic resin, a fibrous material, a cloth shape, or a sheet shape formed of polyethylene, polystyrene, polyamide, polycarbonate or the like can be used. Synthetic resins such as polyethylene and polystyrene, whose melting point is about the same as or lower than the mold temperature, melts during molding to buffer between bamboo fibers and natural fibers to prevent the fibers from being cut off, and the mechanical strength decreases. Can be prevented. Synthetic resins such as polyamide whose melting point is higher than the temperature of the mold can prevent bamboo fibers and the like from being torn, and can be reinforced to prevent a decrease in mechanical strength.
As the inorganic fiber, glass fiber, carbon fiber or the like is used.
One or more sheets of woven fabric, knitted fabric, non-woven fabric, or sheet, with bamboo pieces and natural fibers aligned in the same direction and bonded with an adhesive such as isocyanate adhesive Wrap the sheet etc. around the heartwood. Unevenness can also be formed on the surface of the target rod-shaped member by winding a thin woven fabric or the like like a string around the core material while changing the thickness.
In addition, as a bamboo piece, it is preferable to use what was formed in the shape of a thin bowl. This is for winding in the direction parallel to the core material.

  As fiber yarns made from bamboo, cellulose rayon fiber yarns, cellulose fiber yarns and the like formed from at least one fiber selected from viscose rayon, copper ammonia rayon, acetate, triacetate, and purified cellulose are used. The fiber yarn is wound around the core material in a spiral shape or the like while being bonded with an adhesive such as an isocyanate adhesive as in the filament winding method.

Invention of Claim 7 of this invention is a manufacturing method of the building member of any one of Claim 1 thru | or 6, Comprising: A molded object formation process, a half molded object formation process, A hollow molded object formation It has the structure provided with the compression maintenance process which maintains the compression state of the said metal mold | die after any of the processes.
With this configuration, in addition to the action obtained in any one of claims 1 to 6, the following action is obtained.
(1) Since the compression maintaining step is provided, the next molding operation can be performed by attaching a new mold to the molding apparatus while the mold is detached from the molding apparatus and only the mold is cooled. Therefore, it is possible to increase the operating rate of the molding apparatus and increase productivity, and it is excellent in energy saving.

Here, as the mold, in a compressed state, the movable side mold and the fixed side mold are fixed by screwing with a bolt, nut, turnbuckle or the like, or engaged by a ratchet or the like and fixed. Those having compression maintaining means such as the above are used.
The mold detached from the molding apparatus is removed after cooling or the like.

Invention of Claim 8 of this invention is a manufacturing method of the building member of any one of Claim 1 thru | or 7, Comprising: The said skin of the said bamboo material is the structure removed by the blasting process. Have.
With this configuration, in addition to the action obtained in any one of claims 1 to 7, the following action is obtained.
(1) Since the bamboo skin is removed by blasting, it can be treated in a short time and without unevenness compared to grinding using sander or the like, and is excellent in productivity.
(2) By adjusting the type and processing time of the blast material, only the epidermis can be removed very thinly, and high mechanical strength can be obtained while leaving the fibers near the outer skin having high mechanical strength.

  Here, the blast treatment can be performed after the bamboo material is divided. In addition, by blasting the outer and inner surfaces of the round bamboo cut off except for the nodes, the blasting can be performed in the state of the round bamboo before dividing the bamboo material. By removing the bamboo skin (outer skin and endothelium), it prevents the skin from cracking when it is compressed, cracking or peeling off in layers on the adhesive surface, increasing adhesive bondability and increasing mechanical strength be able to.

As described above, according to the building member manufacturing method of the present invention, the following advantageous effects can be obtained.
According to the invention of claim 1,
(1) Since the molded body forming step is provided, it is possible to provide a method for manufacturing a building member that can manufacture a building member that is hard and has high mechanical strength and small strength variation.
(2) A large-scale high-temperature and high-pressure vessel is not required, and capital investment can be reduced. In addition, the number of conditions necessary for quality control such as the temperature and pressure of the mold to be molded is small, and it is easy to manage and has excellent quality stability. The manufacturing method of can be provided.
(3) A manufacturing method of a building member that is capable of forming a high-temperature steam atmosphere in the cavity in a short time after a single batch processing is completed, and has a short processing time and switching time for each batch and excellent mass productivity. Can be provided.
(4) Since the bamboo piece from which the skin of the bamboo material is removed is used, it is possible to provide a method for manufacturing a building member that can obtain a molded body having high adhesive bondability and high mechanical strength.
(5) Since bamboo pieces and natural fibers are treated with high-temperature steam in a sealed cavity, phenolic compounds, furfural compounds, etc. that have the property of inhibiting the growth of bamboo decaying fungi are generated, and the anticorrosion of building components The manufacturing method of the building member which improves property can be provided.

According to invention of Claim 2, in addition to the effect of Claim 1,
(1) By bonding the groove portions of the two halved molded bodies together, it is possible to manufacture a hard building member having a hollow portion and having high mechanical strength and small strength variation.

According to invention of Claim 3, in addition to the effect of Claim 1,
(1) A building member having a hollow portion can be produced by a single molding operation, and a method for producing a building member excellent in productivity can be provided.

According to invention of Claim 4, in addition to the effect of Claim 3,
(1) It is possible to provide a method for manufacturing a building member that can manufacture a hollow molded body having a substantially uniform density and high mechanical strength such as bending strength.

According to invention of Claim 5, in addition to the effect of Claim 3 or 4,
(1) By injecting high-temperature and high-pressure water vapor from the core material into the mold before compression molding, bamboo pieces and bamboo fibers can be softened in a short time, and after forming a hollow molded body, By injecting cooling fluid such as cold water from the core material, it can be cooled from the inside of the hollow molded body and the cooling time can be shortened, and the core material can be easily removed from the molded hollow molded body, and the construction is excellent in productivity. A method for manufacturing a member can be provided.

According to the invention described in claim 6, in addition to the effect of any one of claims 3 to 5,
(1) A building material that can prevent mechanical strength from being lowered by preventing or reinforcing bamboo fibers and the like by blocking synthetic fibers and inorganic fibers between bamboo fibers and natural fibers. The manufacturing method of can be provided.

According to the invention described in claim 7, in addition to the effect of any one of claims 1 to 6,
(1) While the mold is removed from the molding apparatus and only the mold is cooled, a new mold can be mounted on the molding apparatus and the next molding operation can be performed. It is possible to provide a method for manufacturing a building member that can increase productivity and improve energy saving performance.

According to the invention described in claim 8, in addition to the effect of any one of claims 1 to 7,
(1) Since the skin of the bamboo is removed by blasting, a method for producing a building member that can be processed without spots in a short time compared to grinding and removing using a sander or the like and has excellent productivity. Can be provided.
(2) By adjusting the type of blasting material and the processing time, only the skin can be removed very thinly, and a method for manufacturing a building member that provides high mechanical strength can be provided.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a schematic diagram showing a method for manufacturing a building member in Embodiment 1, (a) and (b) are schematic diagrams showing a half-formed product forming step, and (c) and (d) are adhesions. It is a side view showing a process, (e) is a perspective view of a manufactured building member, FIG. 2 (a) is a perspective view of a connector which is one of application examples of the manufactured building member, FIGS. 2B, 2C and 2D are cross-sectional views showing a method of joining the manufactured building members as bamboo bars.
In FIG. 1, reference numeral 1 denotes a mold pressed from above and below by a molding device (not shown) provided with a heating device, and is formed so as to be detachable from the molding device. 2 is a fixed side mold of the mold 1, 3 is a fixed side cavity forming surface having a substantially rectangular cross section formed by recessing the top surface of the fixed side mold 2, and 4 is a bottom surface of the fixed side cavity forming surface 3 A projecting ridge portion having a substantially semicircular cross-section projecting from 5 is a cooling pipe disposed inside the fixed mold 2 and through which a cooling fluid such as cooling water flows, and 6 is a fixed mold 2. A seal member such as an O-ring disposed around the fixed-side cavity forming surface 3 on the upper surface, 7 is a movable-side mold, and 8 is formed on the lower surface of the movable-side mold 7 and is fitted to the fixed-side cavity forming surface 3. A pressure core having a substantially rectangular cross section inserted, 8a is a planar movable side cavity forming surface formed on the lower surface of the pressure core 8, and 9 is disposed inside the movable side mold 7. A cooling pipe 10 through which a cooling fluid such as cooling water flows 10 is the cavity forming surface 3 when the stationary mold 2 and the movable mold 7 are clamped. 8a is a cavity formed between the, are formed on the rod-like member having substantially the same length and width of the building components of interest. 11 is a film formed by spraying a release sheet such as a double-sided silicone resin-processed oil-resistant paper or a silicone resin on the cavity-forming surfaces 3 and 8a that allows the vapor laid in the cavity 10 to pass but not allow droplets to pass through. The release layer 12 is a plurality of bamboo pieces stacked and accommodated in the cavity 10 such that the longitudinal direction of the cavity 10 coincides with the fiber direction.
In FIG. 1B, 13 is a half-formed product in which a bamboo piece 12 is compression-molded and consolidated into a rod shape having a substantially rectangular cross section, and in FIG. 1C, 14 is half-formed by a protrusion 4. A groove portion formed in a groove shape on one surface of the body 13 in the longitudinal direction, in FIG. 1D, 15 is a corner formed by bonding the groove portions 14 and 14 together and adhering the half-molded bodies 13 and 13 together. In the hollow portion of the columnar rod-shaped member 13a, in FIG. 1 (e), 16 is a rod-shaped member of a building member in which hollow portions 15 opened at both ends are formed in the longitudinal direction.

In FIG. 2A, 17 is an adhesive guide groove formed at both ends of the rod-shaped member 16 and communicated with the hollow portion 15, and 17 a is bored approximately in the middle in the longitudinal direction of the rod-shaped member 16 and communicated with the hollow portion 15. A screw hole having a screw part, 17b is a branch pipe into which one end is screwed into the screw hole 17a and an adhesive is injected, and 17c is a hollow part for injecting an adhesive that opens at both ends of the branch pipe 17b.
In FIG.2 (b), 18 and 18 are the hollow-shaped rod-shaped members of the building member in which the cross section was formed in the linear shape, curved shape, or bending shape of either substantially circular shape, substantially elliptical shape, or a substantially polygonal shape, 18a and 18a are hollow portions formed in the core portions of the rod-shaped members 18 and 18 in parallel with the longitudinal direction, and 18b is formed of wood, bamboo, synthetic resin, metal, etc., and is inserted into the hollow portions 18a and 18a. It is a rod-shaped connecting member screwed.
In FIG.2 (c), 18c is the cylindrical connection member by which the edge part of the rod-shaped members 18 and 18 was inserted or screwed.
In FIG.2 (d), 19 and 19 are one of the construction members in which the cross section is formed in the linear shape, the curved shape, or the bent shape of either a substantially circular shape, a substantially elliptical shape, or a substantially polygonal shape. The rod-shaped member 19a is a cylindrical connecting member into which end portions of the rod-shaped members 19 and 19 are inserted or screwed.

Hereinafter, the manufacturing method of the building member in Embodiment 1 of this invention is demonstrated, referring drawings.
First, a cylindrical bamboo material is cut to a length substantially the same as the length of the cavity 10 while avoiding the round bamboo joints, and further to a width substantially the same as the width of the cavity 10, 1/8 to 1 in the vertical direction. A bamboo piece 12 divided into about / 16 is manufactured. Next, the epidermis (outer skin and inner skin) of the bamboo piece 12 is removed by blasting. The bamboo piece 12 is immersed in water until water penetrates into the bamboo piece 12.
After uniformly applying an adhesive such as an isocyanate-based adhesive on the surface of the bamboo piece 12 taken out from the water, as shown in FIG. After forming the release layer 11 on the surface 3 using a release sheet or the like, the bamboo pieces 12 are sequentially stacked on the release layer 11 until a predetermined thickness is reached.
Next, after the fixed mold 2 and the movable mold 7 are disposed in a molding apparatus (not shown), pipes (not shown) for flowing cooling water or the like are connected to the cooling pipes 5 and 9. The inside of the fixed-side cavity 2 of the fixed-side mold 2 is closed with the pressure core 8 of the movable-side mold 7, and the mold is clamped so as to wrap the bamboo piece 12 with the release layer 11, and the movable-side cavity forming surface 8a. Is brought into contact with the upper surface of the bamboo piece 12, and the cavity forming surfaces 3 and 8a of the fixed side mold 2 and the movable side mold 7 are set to 100 to 180 ° C., preferably 130 to 180 ° C. using a cartridge heater or the like. Heat to. As a result, moisture contained in the bamboo piece 12 evaporates and the bamboo piece 12 in the cavity 10 is filled with high-temperature water vapor, so that the heat of the cavity forming surfaces 3 and 8a is well transmitted to the bamboo piece 12 and the bamboo piece 12 is Softened. This state is maintained for 1 to 10 minutes.

Next, when the movable mold 7 is lowered, the air in the cavity 10 escapes from the gap between the pressurized core 8 and the cavity forming surface 3, so that the bamboo piece 12 has 1-15 MPa, preferably 5-10 MPa. By applying pressure, the bamboo piece 12 is compression-molded so as to have a cross-sectional area ratio of about 1/2 to 1/3, and kept in this state for about 1 to 60 minutes. The adhesive is thermally cured by high-temperature and high-pressure steam generated in the cavity 10, the bamboo pieces 12 are bonded together, the shape is fixed, and the half-consolidated material 13 is manufactured. Further, as shown in FIG. 1B, when the movable mold 7 is lowered until the seal member 6 comes into contact with the movable mold 7, the bamboo pieces 12 are sealed in the airtight cavity 10 sealed by the seal member 6. Is filled with high-temperature and high-pressure water vapor, so that hemicellulose and lignin contained in the bamboo piece 12 are partially depolymerized. As a result, phenol compounds and furfural compounds having the property of inhibiting the growth of bamboo decay fungi can be obtained. Generated to improve the decay resistance of building components. (The above is the half-formed product forming step).
After fixing the shape of the half molded body 13, a cooling fluid such as cooling water is poured into the cooling pipes 5 and 9 to cool the fixed mold 2 and the movable mold 7. When the temperature of the half-formed product 13 becomes low enough to be removed from the fixed mold 2, the half-formed product 13 is taken out together with the release layer 11.
When a plurality of the half molded bodies 13 are manufactured, in the bonding step, as shown in FIG. 1 (c), the grooves 14 and 14 are joined together to bond polyvinyl acetate, ethylene-vinyl acetate copolymer or the like. Using the agent, the half molded bodies 13 and 13 are pressure-bonded to form the hollow portion 15 (see FIG. 1D). After bonding the halved molded bodies 13, 13, the outer peripheral surface is cut with a lathe or the like to manufacture a bar member 16 of a building member having a substantially circular cross section as shown in FIG.

As shown in FIG. 2A, the rod-shaped member 16 is formed with an adhesive guide groove 17 at both ends of the rod-shaped member 16 and a screw hole 17a at an intermediate portion, and a branch pipe 17b is formed at the screw hole 17a during use. Screw it on. The rod-like member 16 is inserted into a pair of communication holes drilled in the contact surface of the structural member, and an adhesive is injected into the hollow portion 15 from the hollow portion 17c of the branch pipe 17b, and the adhesive is introduced from the adhesive guide groove 17. The adhesive is filled between the communication hole and the rod-shaped member 16, and the adhesive in the communication hole is cured to be used as a joining tool for joining the structural members.
Further, when the hollow rod-shaped member 18 is used as a bamboo rebar that is embedded in concrete or the like and reinforces the frame, the ends of the rod-shaped members 18, 18 are connected to each other as shown in FIGS. 2 (b) and 2 (c). A long bamboo rebar can be obtained by fitting a rod-like connecting member 18b into the hollow portions 18a, 18a and connecting a plurality of them. If a screw part is formed in hollow parts 18a and 18a, connecting member 18b can be formed in the shape of a screw, and connecting member 18b can be screwed in and a plurality can be connected. Furthermore, as shown in FIG.2 (c), it can also connect using the cylindrical connection member 18c.

In the present embodiment, the case where the mold 1 having the planar cavity forming surface 3 on which the protrusions 4 are formed has been described. However, a mold having no protrusions 4 on the cavity forming surface 3 is used. By using it, the bamboo piece can be compressed to produce a rod-shaped or plate-shaped solid molded body (molded body forming step). As a result, a solid building member such as bamboo rebar that is used by being embedded in the housing for the purpose of reinforcing the housing such as concrete can be manufactured.
When the solid rod-like member 19 is used as a bamboo reinforcing rod that is embedded in concrete or the like and reinforces the frame, as shown in FIG. 2 (d), a plurality of rod-like members 19, 19 are formed using a cylindrical connecting member 19a. Can be connected and lengthened.
In addition, since the long continuous molded object can be manufactured by using the long bamboo piece manufactured from the bamboo material which cut off the protrusion of the node, in this case, the connection members 18b, 18c, and 19c are used. It does not have to be.
Further, irregularities such as screw grooves or the like can be formed on the outer peripheral surfaces of the rod-shaped members 16, 18, 19. Moreover, a collar part can also be formed at appropriate intervals. Thereby, the adhesiveness of an adhesive agent or concrete can be improved.

According to the construction member manufacturing method in the first embodiment of the present invention as described above, the following effects are obtained.
(1) Since the bamboo piece 12 immersed in water in the cavity 10 of the mold 1 is heated and pressurized together with the adhesive, the moisture in the bamboo piece 12 evaporates and the water vapor fills the cavity 10, and the heated water vapor As a result, the structure of the bamboo piece 12 is softened. Further, by compressing and molding, the cell lumen of the bamboo is compressed and the density is increased, and the half-molded body 13 in which the groove portion 14 is formed by the protruding portion 4 formed on the cavity forming surface 3 can be formed. By sticking together the groove portions 14 of the two halved molded bodies 13, it is possible to manufacture a bar-shaped member 16 that is a hard building member having a hollow portion 15, a high mechanical strength, and a small strength variation.
(2) Since the mold 1 is heated and compression-molded in the cavity 10, a large-scale high-temperature and high-pressure vessel is not required, and the equipment investment can be reduced. The number of conditions required for quality control is small, management is easy, and quality stability is excellent.
(3) Since the bamboo pieces 12 are softened and compressed by high-temperature steam in the cavity 10 having a small volume, a high-temperature steam atmosphere is formed in the cavity 10 in a short time after one batch process is completed. The batch processing time and switching time are short, and the mass productivity is excellent.
(4) Since the bamboo piece 12 from which the skin of the bamboo material is removed is used, the half-shaped molded body 13 having high adhesive strength and high mechanical strength can be obtained. In addition, since the skin of the bamboo is removed by blasting, it can be processed without spots in a short time compared to grinding with sander or the like, and the productivity is excellent.
(5) When the bamboo piece 12 is filled with high-temperature and high-pressure steam in the cavity 10 sealed with the seal member 6, hemicellulose and lignin contained in the bamboo piece 12 are partially depolymerized, and as a result, the bamboo material decays. Phenol compounds, furfural compounds, etc. having the property of inhibiting the growth of fungi are generated to improve the decay resistance of building members.
(6) Since the cooling pipes 5 and 9 are disposed on the fixed side mold 2 and the movable side mold 7, after the bamboo piece 12 is compression molded in the half-molded body forming step, the cooling water or the like It is possible to cool the fixed mold 2 and the movable mold 7 in a short time by flowing a cooling fluid, and it is possible to shorten the time until the half-shaped molded body 13 is taken out from the fixed mold 2, and the productivity is excellent.

In the first embodiment, the case where one cavity 10 is formed in the mold 1 has been described, but a plurality of cavities 10 can be arranged in parallel by increasing the width of the mold 1 or formed in multiple stages. Sometimes. In this case, since a plurality of half-molded products 13 can be manufactured by a single operation, the productivity is further improved.
In the present embodiment, the case where the mold 1 is heated by a cartridge heater or the like has been described. However, an eddy current is generated in the mold 1 by induction heating such as high-frequency induction heating or electromagnetic induction heating to generate Joule heat. In some cases, it is heated. Thereby, while being able to reach desired temperature in a short time, the effect | action that temperature control is easy and heating temperature can be controlled accurately is acquired.
Moreover, in this Embodiment, although the case where the bamboo piece 12 was compression-molded was demonstrated, natural fibers, such as bamboo fiber manufactured by the explosion process etc. which make the bamboo material of a high temperature / high pressure state suddenly into a normal pressure state etc. There is also a case of molding. In this case, natural fibers and an adhesive such as polyvinyl acetate, ethylene-vinyl acetate copolymer, isocyanate adhesive are accommodated in the cavity 10 or natural fibers impregnated with the adhesive are accommodated in the cavity 10. Then, the fixed side cavity forming surface 3 and the movable side cavity forming surface 8a of the fixed side mold 2 and the movable side mold 7 are set to 100 to 180 ° C., preferably 130 to 150 ° C., and the pressure of 1 to 10 MPa is set to 1 to 60. Add in minutes and mold. Thereby, the adhesive penetrates into the natural fiber and is hardened, and it is possible to manufacture a building member that is hard and has high mechanical strength and small strength variation.
In the present embodiment, the case where the seal member 6 such as an O-ring is disposed around the cavity forming surface 3 on the upper surface of the fixed mold 2 has been described. However, the seal member 6 is not necessarily provided. Absent. Unlike the wood, the bamboo piece 12 is made of fibers only in the direction of the axis of the material. Therefore, even if the cavity 10 is not sealed, the shape of the bamboo piece 12 that is compression-molded by pressurizing at a high temperature and holding it for a predetermined time. This is because it can be fixed.

(Embodiment 2)
FIG. 3 is a schematic view showing a method for manufacturing a building member in Embodiment 2, wherein (a) and (b) are schematic views showing a half-molded body forming step, and (c) is a side view showing an adhesion step. It is a figure, (d) is a side view of the manufactured building member, (e) is a perspective view of the building member in which the unevenness | corrugation was formed in the surface, (f), (g) is a collar part on the surface It is a perspective view of the building member in which was formed. In addition, the same thing as Embodiment 1 attaches | subjects the same code | symbol, and abbreviate | omits description.
In the figure, reference numeral 20 denotes a mold pressed from above and below by a molding apparatus (not shown) provided with a heating device, and is formed detachably from the molding apparatus. 21 is a concave cavity forming surface formed on the lower surface of the movable mold 7 and inserted into the cavity forming surface 3. In FIG. 3 (b), 22 is a compression-molded bamboo piece 12 and has a substantially semicircular cross section. 3 (c), reference numeral 23 denotes a groove portion formed in a groove shape in the longitudinal direction on one surface of the half-formed body 22 by the protrusion 4, FIG. 3 (d). ) 24 is a hollow portion formed by bonding the half-consolidated materials 22 and 22 together using an adhesive such as polyvinyl acetate or ethylene-vinyl acetate copolymer together with the groove portions 23 and 23, 25 Is a bar-shaped member of a building member in which hollow portions 24 that open at both ends are formed in the longitudinal direction.
3 (e), reference numeral 26 denotes a bar member of a building member having irregularities formed on the outer surface, in FIG. 3 (f), 27 denotes a bar member of the building member, and 27a is orthogonal to the longitudinal direction of the bar member 27. A groove portion 27b integrally formed in an annular shape with an appropriate interval, 27b is a collar portion formed in a substantially C shape with bamboo laminated material or synthetic resin, etc., and fitted to the groove portion 27a, in FIG. This is a collar portion formed by winding a fiber material such as a synthetic resin fiber or glass fiber with an adhesive attached to the surface of the rod-like member 25 at an appropriate interval perpendicular to the longitudinal direction of the rod-like member 25.

Since the manufacturing method of the building member in Embodiment 2 of this invention is the same as that of what was demonstrated in Embodiment 1, description is abbreviate | omitted.
Note that the bar-shaped member 26 of the building member shown in FIG. 3E can be manufactured by forming irregularities on the cavity forming surface 21.
3 (f) can be manufactured by forming convex portions corresponding to the groove portions 27a at appropriate intervals on the cavity forming surface 21. A building member can be manufactured by fitting the part 27b.
Further, the building member shown in FIG. 3G is formed by winding a fiber material such as a synthetic resin fiber, glass fiber, or natural fiber with an adhesive attached to the surface of the rod-like member 25 to form the collar portion 28. Can be manufactured.

According to the method for manufacturing a building member in the second embodiment as described above, the following operation is obtained in addition to the operation described in the first embodiment.
(1) Since the cavity forming surface 21 is formed in a concave shape, in the half-molded body forming step, a half-molded body 22 whose cross section is consolidated into a substantially semicircular rod shape can be manufactured, Even if the outer surface is not cut with a lathe or the like, the rod-shaped member 25 having a substantially circular cross section can be manufactured, and the productivity is excellent.
(2) By forming irregularities and flanges 27b, 28 on the surface of the rod-like members 25, 26, 27 of the building members, when used as a joint tool used by injecting an adhesive or a bamboo reinforcement for concrete reinforcement, Adhesiveness of adhesive and concrete can be improved.

Here, in the second embodiment, the mold 20 may be formed by arranging a plurality of cavities 10 in parallel or in multiple stages.
In the second embodiment, the case where the mold 20 having the planar cavity forming surface 3 on which the protruding portion 4 is formed is described. However, the protruding portion 4 is formed on the cavity forming surface 3. Instead, by using a mold formed in a concave shape in the same manner as the cavity forming surface 21, the bamboo pieces can be consolidated to produce a rod-shaped solid molded body (molded body forming step). As a result, a solid building member such as bamboo rebar that is used by being embedded in the housing for the purpose of reinforcing the housing such as concrete can be manufactured.

FIG. 4 is a schematic view showing a modification of the method for manufacturing a building member in Embodiment 2, FIG. 4 (a) is a plan view of a fixed mold, and FIG. 4 (b) is a fixed mold. FIG. 4C is a schematic cross-sectional view showing a state in which a multi-layer bamboo piece is accommodated in a fixed mold, and FIG. It is a perspective view of the curved rod-shaped member made.
In the figure, reference numeral 2a denotes a fixed side mold, 4a denotes a protrusion having a substantially semicircular cross section projecting from the bottom surface of the cavity forming surface 3, and 10a denotes a fixed side mold 2 and a movable side mold 7. It is a cavity formed between the fixed-side cavity forming surface 3 and the movable-side cavity forming surface 8a when the mold is clamped, and is formed to have substantially the same length and width as the bar-shaped member of the target curved building member. Yes. Reference numeral 12 denotes a plurality of bamboo pieces accommodated in the cavity 10a so that the longitudinal direction of the cavity 10a coincides with the fiber direction, and the bamboo pieces 12a for multiple layers are stacked while being shifted little by little. 24a is a hollow part formed by bonding two halved molded bodies, 25a is a curved shape of a building member in which two halved molded bodies are bonded and two hollow parts 24a are formed in the longitudinal direction. It is a rod-shaped member.
Since the manufacturing method of the building member in the embodiment of the present invention is the same as that described in the first embodiment, the description thereof is omitted.
As described above, the rod-shaped member 25a having a curvature can be manufactured by alternately compressing and stacking a plurality of short bamboo pieces 12a in the cavity 10a. Similarly, a bent rod-shaped member can be manufactured.

FIG. 5 is a schematic view showing another modification of the method for manufacturing a building member in the second embodiment, and (a) and (b) are schematic views showing a half-formed product forming step. In addition, the thing similar to Embodiment 1 or 2 attaches | subjects the same code | symbol, and abbreviate | omits description.
In the figure, reference numeral 20a denotes a mold pressed from above and below by a molding apparatus (not shown) provided with a heating device, and is formed so as to be detachable from the molding apparatus. Reference numeral 7a denotes an extending portion projecting on both sides of the movable mold 7, 7b denotes a plate-like member suspended from the lower portion of the extending portion 7a, and 7c denotes compression maintaining means formed on one side of the plate-like member 7b. The ratchet portion 29 is a support member formed on both sides of the fixed mold 2, 29 a is a guide portion formed at the end of the support member 29 and slidably contacts the side surface of the plate-like member 7 b, and 29 b is the support member 29. A claw portion as a compression maintaining means which is rotatably fixed to the ratchet portion 7c, 29c is a pivot for fixing the claw portion 29b to the support member, 29d is fixed to both sides of the fixed mold 2 and the other It is an elastic member such as a spring whose end is fixed to the claw portion 29b and biases the claw portion 29b in the direction of the ratchet portion 7c.
Bamboo pieces 12b are stacked next to the ridges 4 projecting from the bottom of the cavity forming surface 3, and 12c is stacked between the upper surface of the ridges 4 and the inner surfaces of the bamboo pieces 12 and 12b. A bamboo-shaped piece of bamboo. An adhesive is attached to the bamboo pieces 12b and 12c.
The method for manufacturing a building member in the modification of the second embodiment of the present invention is the same as that described in the first embodiment, but using the mold 20a configured as described above, a molding apparatus (not shown). When the bamboo pieces 12, 12b, 12c are compression-molded by using the compression molding device, the ratchet portion 7c is engaged with the claw portion 29b when the movable mold 7 is lowered. Even when the mold 20a is detached, the shape of the bamboo pieces 12, 12b, 12c can be maintained while being compressed in the mold 20a (compression maintaining step).

According to the construction member manufacturing method in the modification of the second embodiment as described above, the following actions are obtained in addition to the actions described in the first embodiment.
(1) Since the compression maintaining step is provided, a new mold is mounted on the molding apparatus and the next molding operation is performed while the mold 20a is detached from the molding apparatus and only the mold 20a is cooled. Therefore, the operating rate of the molding apparatus can be increased to increase productivity, and the molding apparatus does not need to be cooled, so that energy saving is excellent.
(2) Since the bowl-shaped bamboo pieces 12c are stacked between the upper surface of the protrusion 4 in the cavity 10 and the inner surfaces of the bamboo pieces 12 and 12b, the bamboo piece 12 directly above the protrusion 4 Can be prevented from being greatly deformed along the ridge 4, and the bamboo piece 12 pressed against the ridge 4 is prevented from cracking or cracking to produce a building member having no defect. it can.

Here, in the present embodiment, a case has been described in which a compression maintaining means for engaging the movable mold 7 and the fixed mold 2 of the mold 20a with the ratchet portion 7c and the claw portion 29b is provided. In some cases, it is fixed by screwing with bolts, nuts, turnbuckles, or the like. The shape maintaining means can also be provided between the fixed mold 2 and the movable mold 7 described in the first embodiment. In this case, the same effect can be obtained.
Moreover, although the case where the bowl-shaped bamboo piece 12c was accommodated on the protrusion part 4 in the cavity 10 was demonstrated, the bamboo fiber which adhered the adhesive agent may be used instead of the bamboo piece 12c. In this case, the same effect can be obtained.

(Embodiment 3)
6 is an exploded perspective view of a building member mold according to Embodiment 3, and FIGS. 7A and 7B are schematic views showing a hollow molded body forming step, and FIG. ) Is a cross-sectional view taken along the line AA of FIG. 7, FIG. 7D is a side view of the manufactured building member, and FIG. 8 is a configuration diagram of piping connected to the core material.
In the figure, reference numeral 30 denotes a mold pressed from above and below by a molding apparatus (not shown) provided with a heating device, and is formed detachably from the molding apparatus. 31 is a fixed mold of the mold 30, 32 is a cavity formed by recessing the upper surface of the fixed mold 31, 32 a is a concave cavity forming surface at the bottom of the cavity 32, and 33 is a longitudinal direction of the cavity 32 The guide groove is formed in the shape of a long hole from the upper surface of the fixed side die 31 to a predetermined portion, and 34 is the upper surface of the fixed side die 31. A guide hole having a substantially rectangular cross section that is drilled downward from and communicates with the guide groove 33, 35 is a seal member such as an O-ring disposed on the upper surface around the cavity 32 of the fixed mold 31, Reference numeral 36 denotes a cooling pipe which is disposed inside the fixed side mold 31 and through which a cooling fluid such as cooling water flows. 37 is a movable side mold. 37 a is formed on the lower surface of the movable side mold 37 and is fitted in the cavity 32. The pressure core 38 to be inserted is formed on the lower surface of the pressure core 37a. The concave cavity forming surface 39 is formed at both ends of the pressure core 37a and is inserted into the guide groove 33 when the mold is clamped, and 40 is projected from the side of the core material pressing portion 39. Guide protrusions that are inserted into the guide hole 34 when tightening, 40a is a seal member disposed on the side surface of the guide protrusion 40, 41 is a core pressing part 39, guide protrusion 40 of the movable side mold 37, A cooling pipe disposed inside the cavity forming surface 38 and through which a cooling fluid such as cooling water flows, 42 is a core made of a metal hollow pipe made of stainless steel or the like, and both ends are inserted into the guide groove 33 , 43 is a plurality of holes formed on the peripheral wall of the core material 42 through which one or more of water vapor and cooling fluid pass, and 43a is disposed on the outer periphery in the vicinity of both ends of the core material 42. The seal member is pressed. Both ends of the core material 42 protrude from the guide groove 33 to the outside of the fixed die 31. A pipe 47a in which a water vapor generating device 47d, a safety valve 47h, a cooling fluid circulation device 47j, and switching valves 47b and 47f, which will be described later, are disposed. 47e are connected.

7A, reference numeral 44 denotes a plurality of bamboo pieces stacked and accommodated in the cavity 32 below the core material 42 so that the longitudinal direction of the cavity 32 and the fiber direction coincide with each other, and 45 denotes the longitudinal direction of the cavity 32. A plurality of bamboo pieces stacked and accommodated in the cavity 32 on the upper side of the core material 42 with the direction of the fibers aligned, in FIGS. 7B and 7C, 44a and 45a are compression-molded bamboo pieces 44 and 45. A hollow molded body consolidated and integrated into a rod shape having a substantially circular cross section, in FIG. 7D, 46 is a hollow portion formed by removing the core material 42 from the hollow molded bodies 44a and 45a, and 47 is both end portions. The hollow part 46 opened in is a bar-like member of a building member formed in the longitudinal direction.
In FIG. 8, 47a is a pipe connected to one end of the core material 42, 47b is a switching valve provided in the pipe 47a, 47c is a steam pipe connected to the switching valve 47b, and 47d is provided in the steam pipe 47c. A steam generator 47e is connected to the other end of the core material 42, 47f is a switching valve disposed in the piping 47e, 47g is a steam piping connected to the switching valve 47f, and 47h is disposed in the steam piping 47g. The provided safety valve 47i is a cooling fluid pipe connected to the switching valves 47b and 47f, and 47j is provided in the cooling fluid pipe 47i to generate a cooling fluid such as cold air to circulate in the system. , 47k is a regulating pipe that releases the cooling fluid that has been heated and expanded to increase its pressure, and 47l is a relief valve disposed in the regulating pipe 47k. In the present embodiment, the safety valve 47h is set so that water vapor is released to the outside when the pressure exceeds a set value of 120 to 2500 kPa.

Hereinafter, the manufacturing method of the building member in Embodiment 3 of this invention is demonstrated, referring drawings.
First, as in the first embodiment, bamboo pieces 44 and 45 divided into about 1/8 to 1/16 in the vertical direction are manufactured. Next, the epidermis (outer skin and inner skin) of the bamboo pieces 44 and 45 is removed by blasting.
After uniformly applying an adhesive such as an isocyanate-based adhesive on the surfaces of the bamboo pieces 44 and 45, as shown in FIG. 7A, in the hollow molded body forming step, a predetermined inside of the cavity 32 of the fixed mold 31 is obtained. The bamboo pieces 44 are stacked in order until the thickness becomes. If necessary, a release layer such as a silicon resin layer is formed in the cavity 32 as in the first embodiment.
Next, the core material 42 is disposed on the bamboo piece 44, and the seal members 43 a at both ends of the core material 42 are inserted into the guide hole 34. Next, the bamboo pieces 45 are sequentially stacked on the core material 42 until a predetermined thickness is reached.
Next, after the fixed side mold 31 and the movable side mold 37 are arranged in a molding apparatus (not shown), pipes (not shown) for flowing cooling water or the like are connected to the cooling pipes 36 and 41. Pipes 47 a and 47 e are connected to both ends of the core material 42.
The pressurizing core 37a of the movable mold 37 is inserted into the cavity 32 of the fixed mold 31, and the core pressing member 39 of the movable mold 37 is inserted into the guide groove 33 and the guide hole 34 of the fixed mold 31. After inserting the guide convex portions 40 and bringing the cavity forming surface 38 of the movable mold 37 into contact with the bamboo piece 45, the cavity forming surfaces 32a and 38 of the fixed mold 31 and the movable mold 37 are set to 100. Heat to ~ 180 ° C, preferably 130-150 ° C. Further, the switching valves 47 b and 47 f are switched to the pipes 47 c and 47 g side, and high-temperature steam is introduced into the cavity 32 through the hole 43 of the core material 42. As a result, water contained in the bamboo pieces 44 and 45 evaporates and water vapor is forcibly introduced into the cavity 32 from the water vapor generator 47d, and the bamboo pieces 44 and 45 in the cavity 32 are filled with high-temperature water vapor. The bamboo pieces 44 and 45 are softened. This state is maintained for 1 to 10 minutes.

Next, as shown in FIG. 7B, the movable side mold 37 is moved down, and the core material 42 is lowered along the guide groove 33 while being pushed down by the core material pressing portion 39. A pressure of -15 MPa, preferably 5-10 MPa is applied, and the bamboo pieces 44, 45 are compression-molded so as to have a cross-sectional area ratio of about 1/2 to 1/3 with the pressurized core 37a. If this state is maintained for about 1 to 60 minutes, the adhesive is thermally cured by the high-temperature and high-pressure steam in the cavity 32, the bamboo pieces 44 and 45 are bonded together, and the shape is fixed to produce the hollow molded bodies 44a and 45a. Is done. When the movable mold 37 is lowered until the seal member 35 contacts the movable mold 37, the bamboo pieces 44 and 45 are filled with high-temperature and high-pressure steam in the cavity 32 sealed by the seal member 35. The hemicellulose and lignin contained in the pieces 44 and 45 are partially depolymerized. As a result, phenolic compounds, furfural compounds, etc. having the property of inhibiting the growth of bamboo decay fungi are generated and the corrosion resistance of the building members is increased. Improve. (The hollow molded body forming step).
When the shapes of the hollow molded bodies 44a and 45a are fixed, a cooling fluid such as cooling water is passed through the cooling pipes 36 and 41 to cool the fixed mold 31 and the movable mold 37. Further, the switching valves 47 b and 47 f are switched to the pipe 47 i side to supply a cooling fluid such as cold air into the core material 42. As a result, the hollow molded bodies 44a and 45a are cooled from the inside, and the core material 42 is cooled to reduce the diameter, so that the hollow molded bodies 44a and 45a are easily detached from the hollow molded bodies 44a and 45a. After the hollow molded bodies 44a and 45a have reached a temperature that can be taken out from the fixed mold 31, the hollow molded bodies 44a and 45a are taken out together with the core material 42, various pipes are removed, and the seal member 43a on one side is removed from the core material 42. Then, the core material 42 is pulled out from the hollow molded bodies 44a and 45a to produce a bar-shaped member 47 of a building member having a substantially circular cross section in which a hollow portion 46 as shown in FIG. 7D is formed.

According to the method for manufacturing a building member in the third embodiment as described above, the following operation is obtained in addition to the operation described in the first embodiment.
(1) Since the core material 42 is accommodated in the cavity 32 and compression-molded together with the bamboo pieces 44 and 45, the bar-shaped member 47 of the building member having the hollow portion 46 can be manufactured by a single molding operation, and the productivity is excellent.
(2) Since the fixed-side mold 31 includes guide grooves 33 that communicate with both ends of the cavity 32, and the movable-side mold 37 includes a core material pressing portion 39 that presses down both ends of the core material 42 during compression molding, Since the core material 42 is pushed down as the mold 37 moves and is compressed and deformed, a hollow molded body having a substantially uniform density and high mechanical strength such as bending strength can be manufactured.
(3) Since the core material 42 is formed of a hollow tube having a hole 43 formed in the peripheral wall, high-temperature and high-pressure water vapor is injected into the cavity 32 from the core material 42 before compression molding. 45 can be softened in a short time and is excellent in productivity. In addition, after forming the hollow molded body, by injecting a cooling fluid such as cold air from the core material 42, it is possible to cool from the inside of the hollow molded body and shorten the cooling time, and the core material 42 is cooled and contracted. The core material 42 can be easily removed from the molded hollow molded body, and productivity can be increased.

The compression maintaining means described in the modification of the second embodiment is provided between the fixed mold 31 and the movable mold 37, and the mold 30 is detached from the molding apparatus after the hollow molded body forming step. There is also a case. In this case, the productivity of the building member can be increased by increasing the operating rate of the molding apparatus, which is preferable.
Further, when the core material 42 and the bamboo pieces 44 and 45 are accommodated in the cavity 32, it is preferable to arrange a thin basket-like bamboo piece or bamboo fiber with an adhesive attached around the core material 42. It is possible to prevent the bamboo pieces 44 and 45 from being greatly deformed along the core material 42, and to prevent the bamboo pieces 44 and 45 pressed against the core material 42 from being cracked or cracked and to have no defect. It is for manufacturing a member.

(Embodiment 4)
FIG. 9 is a perspective view showing a method for manufacturing a building member in the fourth embodiment, and FIG. 10 is a schematic view showing a hollow molded body forming step in the fourth embodiment. In addition, the thing similar to what was demonstrated in Embodiment 3 attaches | subjects the same code | symbol, and abbreviate | omits description.
In FIG. 9A, 48 is formed in a woven fabric, a knitted fabric, a non-woven fabric, a paper shape, etc. with a synthetic resin such as a thermoplastic resin such as polyethylene, polystyrene or polycarbonate, or an inorganic fiber such as glass fiber or carbon fiber. The sheet material 48a is arranged so that the fiber direction coincides with the longitudinal direction of the core material 42, and bamboo-like bamboo pieces and natural fibers bonded to the sheet material 48 with an adhesive such as an isocyanate-based adhesive, 49 is bamboo pieces or This is a wound molded body in which the sheet material 48 to which the natural fibers 48a are bonded is wound around the core material 42 until it reaches a predetermined thickness.
In FIG. 9B, 48b is a fiber yarn such as cellulose rayon fiber yarn and cellulose fiber yarn made of bamboo material, and 49a is spirally wound until the fiber yarn 48b reaches a predetermined thickness around the core material 42. A wound molded body.
In FIG. 10, 50 is a mold pressed by a molding apparatus 65 which will be described later provided with a heating apparatus, 51 is a fixed mold of the mold 50, 52 is a cavity formed in the fixed mold 51, 52a is A concave cavity forming surface formed on a predetermined surface of the cavity 52, 53 is a cooling pipe arranged inside the fixed side mold 51 and through which a cooling fluid such as cooling water flows, and 54 is a fixed side mold 51. Guide hole portions drilled at predetermined positions, 55 is a side surface mold of the mold 50, 56 is a guide convex portion protruding from a position corresponding to the guide hole portion 54 and inserted into the guide hole portion 54, and 57 is a side surface mold. A seal member such as an O-ring disposed at the end of the tube in the longitudinal direction, 58 is a cooling pipe disposed inside the side surface mold 55 through which a cooling fluid such as cooling water flows, and 59 is a movable side mold. , 60 are formed on the lower surface of the movable mold 59 and are formed in the cavity 52. The pressure core to be inserted, 61 is a concave cavity forming surface formed on the lower surface of the pressure core 60, 62 is a sealing member such as an O-ring disposed around the root of the pressure core 60, and 63 is A cooling pipe disposed inside the movable side mold 59 and through which a cooling fluid such as cooling water flows, 64 is a restraining member that holds a plurality of molds 50 in parallel and 64a is placed on the mold 50 A plate-like abutting member to be contacted, 65 is a molding device that presses a plurality of molds 50 restrained by the restraining member 64, and the restraining member 64 is detachably formed on the molding device 65.

Hereinafter, the manufacturing method of the building member in Embodiment 4 of this invention is demonstrated, referring drawings.
First, bamboo pieces and natural fibers 48a, which are formed by dividing the bamboo material from which the skin has been removed and formed into a bowl shape, are bonded to the sheet material 48 using an adhesive such as an isocyanate-based adhesive with the fiber direction aligned. Next, as shown in FIG. 9A, the bamboo pieces and the natural fibers 48a are wound around the core material 42 so that the fiber directions of the bamboo pieces and natural fibers 48a coincide with the longitudinal direction of the core material 42 until the core material 42 has a predetermined thickness. A wound molded body 49 provided through is manufactured.
Next, as shown in FIG. 10 (a), after the wound molded body 49 is accommodated in the cavity 52 of the fixed mold 51, it is pressurized and wound between the side mold 55 and the fixed mold 51. The cross section of the molded body 49 is deformed into an oval shape. If necessary, heating or water vapor can be introduced as described in the third embodiment.
Next, as shown in FIGS. 10B and 10C, a plurality of molds 50 are arranged side by side and restrained in the restraining member 64, and the mold 50 is pressed from above and below by the molding device 65 to form a wound molded body. By compacting 49, a hollow molded body can be manufactured (the hollow molded body forming step). In the hollow molded body forming step, the point that the wound molded body 49 is softened with high-temperature steam, the point that compression molding is performed at a high temperature, and the point that the core material 42 is pushed down by the core material pressing portion are those described in the third embodiment. Since it is the same as that, description is abbreviate | omitted.

According to the method for manufacturing a building member in the fourth embodiment as described above, the following operation is obtained in addition to the operation described in the third embodiment.
(1) Bamboo materials are strong in fibers, and compression molding may cause the fibers of the bamboo materials to compress each other and cut the fibers, resulting in a decrease in mechanical strength, but a woven fabric formed of synthetic resin or inorganic fibers, Since it is wound around the core material 42 together with the sheet material 48 such as a knitted fabric, non-woven fabric, or sheet, the synthetic resin or the like cushions the bamboo fibers or the natural fibers and prevents the fibers from being cut off. It is possible to prevent the mechanical strength of the steel from being lowered. Further, by using the sheet material 48 formed of glass fiber or inorganic fiber, the building member can be reinforced and the mechanical strength can be prevented from being lowered.
(2) Since the plurality of molds 50 are constrained by the constraining member 64 and molded together, the productivity is excellent.
(3) Since the restraining member 64 is detachably formed on the molding device 65, when the mold 50 is cooled after compression molding, the die 50 is removed from the molding device 65 together with the restraining member 64, and the running water, A cooling medium such as air can be quickly cooled by putting it on the mold 50, and the productivity is excellent.

In addition, although the case where the wound molded object 49 was used was demonstrated, the wound molded object 49a may be used similarly. In this case, the fiber yarn 48b can be formed by being spirally wound around the core material 42 until it reaches a predetermined thickness, and the productivity is excellent.
Further, the amount of compressive deformation of the wound molded body 49 is small because the sheet material 48 is interposed between bamboo pieces and natural fibers, and depending on the amount of compression, the sheet material 48 may be compressed in the longitudinal direction of the wound molded body 49. Although wrinkles may occur along the surface, the tensile strength of the obtained building member is hardly lowered, and a recess is formed on the inner surface of the mold 50 (contact surface of the wound molded body 49). Thus, a convex portion can be formed on the surface of the wound molded body 49 by the generated scissors, and the convex portion on the surface of the building member manufactured as a joint bar used by injecting an adhesive or a bamboo reinforcing bar for concrete reinforcement. It is preferable because the adhesiveness of the adhesive and concrete is improved.
Further, the compression maintaining means described in the modification of the second embodiment is provided between the restraining member 64 and the abutting member 64a, and after the hollow molded body forming step, the die 50 together with the restraining member 64 is formed by the molding device 65. Since the metal mold 50 can be cooled by being detached from the mold, the operating rate of the molding apparatus 65 can be increased to increase the productivity of building members, and since the molding apparatus 65 is not cooled, the energy efficiency is excellent.

Hereinafter, the present invention will be specifically described by way of examples. The present invention is not limited to these examples.
Example 1
Bamboo mushrooms (density about 0.56) were cut to a length of 290 mm and then divided to a width of about 25 mm, and then a piece of bamboo from which the outer skin and the inner skin were removed by blasting was produced. Next, this bamboo piece was immersed in water for 24 hours. Subsequently, about 300 g / m < ² > of isocyanate adhesives were apply | coated to the surface of the bamboo piece taken out from water.
Seven bamboo pieces coated with adhesive are stacked in a mold cavity formed in a rectangular shape with a length of 300 mm and a width of 30 mm, and the mold is heated to 130 ° C. and held at a pressure of 7 MPa for 60 minutes. Compression molded. As a result, a material having a thickness of about 40 mm before molding was compressed to a thickness of 20 mm, and a rectangular parallelepiped shaped product having a length of 300 mm, a width of 30 mm, and a thickness of 20 mm was obtained.
The molded body was cut in the width direction and the length direction to obtain a test piece having a length of 250 mm, a width of 20 mm, and a thickness of 20 mm. While measuring the density of this test piece and measuring the tensile strength according to JIS Z2101, the density is 1.2 g / cm ³ , the tensile strength is 350 MPa on average, and steel (SS400) (tensile strength 400 MPa It was revealed that it has a high tensile strength close to.

(Example 2)
A test piece of Example 2 was obtained in the same manner as in Example 1 except that Mosouchiku (density about 0.98) was used instead of Madatake.
Measurement of the density and tensile strength of this test piece, the density is 1.3 g / cm ^3, tensile strength was averaged 300 MPa.

(Example 3)
An isocyanate-based adhesive is sprayed on natural fibers made of bamboo fibers obtained by blasting bamboo (Madatake), and this is accommodated in a cavity of a mold formed in a rectangular shape having a length of 300 mm and a width of 30 mm, The mold was heated to 130 ° C. and held at a pressure of 7 MPa for 60 minutes for compression molding. As a result, a material having a thickness of about 80 mm before molding was compressed to a thickness of 20 mm, and a rectangular parallelepiped shaped body having a length of 300 mm, a width of 30 mm, and a thickness of 20 mm was obtained.
The molded body was cut in the width direction and the length direction to obtain a test piece having a length of 250 mm, a width of 20 mm, and a thickness of 20 mm. When the tensile strength of this test piece was measured according to JIS Z2101, it was 330 MPa or more on average.
In addition, when the natural fiber taken out from hemp (choma) was compression-molded similarly and the test piece was created, the tensile strength of this test piece was 300 MPa or more on average.

(Comparative Example 1)
Bamboo mushrooms (density about 0.56) were cut to a length of 290 mm and then divided to a width of about 25 mm, and then a piece of bamboo from which the outer skin and the inner skin were removed by blasting was produced. After this bamboo piece is cut into a thin plate shape, an isocyanate-based adhesive is applied to the thin plate, and the seven-layer thin plate is pressed and bonded at room temperature to form a laminated material, and then the width direction, the thickness direction, and the length direction are determined. Cutting was performed to obtain a test piece having a length of 250 mm, a width of 20 mm, and a thickness of 20 mm. The tensile strength of this test piece was an average of 180 MPa.
(Comparative Example 2)
A test piece of Comparative Example 2 was obtained in the same manner as Comparative Example 1 except that Mosouchiku (density about 0.98) was used instead of Madatake. The tensile strength of this test piece was an average of 100 MPa.

  As described above, according to the present example, it has been clarified that a high tensile strength close to steel (SS400) (tensile strength 400 MPa) can be obtained by compressing and compacting bamboo pieces and natural fibers. . It was also found that the number of conditions necessary for quality control such as the temperature and pressure of the mold to be molded is small and easy to manage, there are few variations in strength, and the stability of quality is excellent.

  The present invention is embedded between structural members for the purpose of joining structural members such as beams and eaves girders, eaves girders and columns, torso and through columns, columns and columns for the purpose of labor saving and rationalization of buildings such as houses. In connection with the manufacturing method of building members such as bamboo bars that are used embedded in the housing for the purpose of reinforcing the housing such as joints, concrete, etc., it is possible to manufacture hard building materials with high mechanical strength and small variations in strength, In addition, the number of conditions required for quality control, such as the temperature and pressure of the mold to be molded, is small, easy to manage and excellent in quality stability. Also, batch processing time and switching time are short, and mass productivity is excellent. The manufacturing method of the building member which improves property can be provided.

The schematic diagram which shows the manufacturing method of the building member in Embodiment 1. FIG. (A) Perspective view of a connector which is one of the application examples of the manufactured building member (b) (c) (d) Cross-sectional view showing a bonding method of the manufactured building member as a bamboo bar The schematic diagram which shows the manufacturing method of the building member in Embodiment 2. FIG. The schematic diagram which shows the modification of the manufacturing method of the building member in Embodiment 2. FIG. Schematic which shows another modification of the manufacturing method of the building member in Embodiment 2. FIG. The exploded perspective view of the metal mold | die of the building member in Embodiment 3 (A), (b) Schematic diagram showing hollow molded body forming step (c) Sectional view taken along line AA of (b) Configuration diagram of piping connected to core material The perspective view which shows the manufacturing method of the building member in Embodiment 4. FIG. Schematic diagram showing the hollow molded body forming step in the fourth embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2,2a Fixed side mold 3 Fixed side cavity formation surface 4,4a Projection part 5 Cooling pipe 6 Seal member 7 Movable side mold 7a Extension part 7b Plate-like member 7c Ratchet part 8 Pressure core 8a Movable-side cavity forming surface 9 Cooling tube 10, 10a Cavity 11 Release layer 12, 12a, 12b, 12c Bamboo piece 13 Half-formed product 13a Bar member 14 Groove portion 15 Hollow portion 16, 18, 19 Bar member 17 Adhesive guide Groove 17a Screw hole 17b Branch pipe 17c Hollow part 18a Hollow part 18b, 18c, 19a Connection member 20, 20a Mold 21 Cavity forming surface 22 Half-formed product 23 Groove part 24, 24a Hollow part 25, 25a, 26, 27 Rod shape Member 27a Groove part 27b, 28 Gutter part 29 Support member 29a Guide part 29b Claw part 29c Axis 29d Elastic member 30 Mold 31 Fixed side mold 32 Cavity 32a Cavity forming surface 33 Guide groove 34 Guide hole 35 Seal member 36 Cooling tube 37 Movable side mold 37a Pressurizing core 38 Cavity forming surface 39 Core material pressing part 40 Guide convex part 40a Seal member 41 Cooling Pipe 42 Core material 43 Hole 43a Seal member 44, 45 Bamboo piece 44a, 45a Hollow molded body 46 Hollow portion 47 Rod member 47a Piping 47b Switching valve 47c Steam piping 47d Steam generating device 47e Piping 47f Switching valve 47g Steam piping 47h Safety valve 47i Cooling fluid piping 47j Cooling fluid circulation device 47k Adjustment tube 47l Relief valve 48 Sheet material 48a Bamboo pieces and natural fibers 48b Fiber yarn 49, 49a Winding molded body 50 Mold 51 Fixed side mold 52 Cavity 52a Cavity formation Surface 53 Cooling tube 54 Guide hole portion 55 Side surface mold 56 Guide convex portion 57 Seal member 58 Cooling tube 59 Movable side mold 60 Pressurizing core 61 Cavity forming surface 62 Seal member 63 Cooling tube 64 Restraining member 64a Contact plate 65 Molding device

Claims (8)

A method of manufacturing a building member such as a rod-like member having a cross-sectional shape that is substantially circular, substantially elliptical, or substantially polygonal, linear, curved, or bent,
A plurality of bamboo pieces and / or natural fibers and adhesives with the bamboo skin removed are accommodated in the mold cavity, and the bamboo pieces and / or the natural fibers are compression molded in the mold at a high temperature that is clamped. And the manufacturing method of the building member characterized by including the molded object formation process which forms a molded object. A rod-like member having a cross-sectional shape that is substantially circular, substantially elliptical, or substantially polygonal, linear, curved, or bent, and at the center of the rod-like member in parallel with the longitudinal direction throughout Or a hollow part that opens at both ends or one end, and a manufacturing method of a building member comprising:
A plurality of bamboo pieces from which the skin of the bamboo material is removed in the cavity of the mold in which the ridges forming the grooves that halve the hollow part of the building member along the longitudinal direction are formed on the cavity forming surface Half-molded, containing bamboo fiber and adhesive, compression-molding the bamboo piece and / or the natural fiber in the mold at a high temperature clamped to form a half-formed product with the groove formed Body formation process;
After taking out the half molded body from the mold, an adhesion step of bonding the groove portions of the two half molded bodies together;
The manufacturing method of the building member characterized by comprising. A rod-shaped member having a cross-sectional shape that is substantially circular, substantially elliptical, or substantially polygonal, linear, curved, or bent, and formed at both ends of the rod-shaped member formed in the longitudinal direction of the rod-shaped member A hollow member that is open, and a manufacturing method of a building member comprising:
A plurality of bamboo pieces and / or natural fibers from which the skin of the bamboo material has been removed and an adhesive are accommodated in the mold, and the core material forming the hollow portion of the building member is an abbreviation of the bamboo pieces and / or the natural fibers. A hollow molded body forming step is provided in which the bamboo pieces and / or the natural fibers are compression molded in the hot mold placed in the center and clamped to form a hollow molded body in which the hollow portion is formed. A method for producing a building member, comprising:   The mold is formed in a long hole shape in the same direction as the movable direction of the movable side mold, communicating with the both end parts of the cavity, and a movable side mold having a core material pressing portion that presses down both ends of the core material during molding. The manufacturing method of the building member of Claim 3 provided with the stationary side metal mold | die which has a guide groove in which the both ends of the said core material are penetrated.   5. The method for manufacturing a building member according to claim 3, wherein the core material is formed of a hollow tube in which a hole through which one or more of water vapor and a cooling fluid passes is formed in a peripheral wall. .   The bamboo piece and / or the natural fiber is wound around the core material together with at least one of a woven fabric, a knitted fabric, a non-woven fabric and a sheet formed of one or more of synthetic resin and inorganic fiber and the adhesive. The manufacturing method of a building member according to any one of claims 3 to 5, wherein a fiber yarn made from the bamboo material and the adhesive are wound around the core material.   The compression maintenance process of maintaining the compression state of the said metal mold | die is provided after any one of a molded object formation process, a half molded object formation process, and a hollow molded object formation process. The manufacturing method of the building member of any one of them.   The method for manufacturing a building member according to any one of claims 1 to 7, wherein the skin of the bamboo material is removed by blasting.

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