Bamboo building materials

Abstract

To provide a bamboo building material which is made from 100% natural materials and is resistant to deterioration over time. [Solution] Bamboo building material 10 has the inside of bamboo 1 filled with a material made of a mixture of bamboo fiber 5 and cement 3 or tar derived from bamboo.

Description

[Technical field]

[0001] This invention relates to bamboo building materials. [Background technology]

[0002] Bamboo has been effectively utilized in order to make effective use of resources and reduce the use of chemicals that are harmful to the environment and human body. For example, there is a civil engineering and construction material characterized by crushing bamboo, adding solid liquid, mixing, pouring into any formwork, vibrating and compressing, and drying (Patent Document 1). There is also a material characterized by mixing bamboo powder obtained by steaming bamboo, drying and crushing, and further classifying it with cedar powder obtained by crushing cedar wood and further classifying it to obtain a powder material for molding, and then heating and pressing this powder material for molding in a mold to obtain a molded body (Patent Document 2). In addition, the cut pieces of bamboo with the bark removed are crushed into chips by changing the air pressure and expanded (S1), and the crushed bamboo material is mixed with an adhesive and stirred by centrifugal force to mold it into a columnar shape (S3). In this manufacturing method, the crushed bamboo material is molded into a columnar shape by centrifugal force, so there is an invention that makes it easy to obtain a column of any shape and size that is homogeneous (Patent Document 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 49-99375 [Patent Document 2] JP 2017-177621 A [Patent Document 3] Japanese Patent Application Publication No. 9-290412 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the bamboo materials shown in Patent Documents 1 to 3 have the problem that they are not made from 100% natural materials because they are made by crushing bamboo and hardening it with an adhesive. In addition, the use of adhesives also causes problems with deterioration over time.

[0005] The purpose of this invention was made in consideration of the above, and is to provide a bamboo building material that is made from 100% natural materials and has reduced deterioration over time. [Means for solving the problem]

[0006] The above objectives are: This is achieved by a bamboo building material in which the inside of the bamboo is filled with a mixture of bamboo fiber and cement or tar derived from bamboo. In addition, the above objectives are: Buildings constructed using the above bamboo building materials as pillars, This is achieved by: In addition, the above objectives are: The building above uses concrete mixed with bamboo powder and cement for the foundation. This is achieved by: Effect of the Invention

[0007] According to the present invention, it is possible to provide bamboo building materials that are made from 100% natural materials and have reduced deterioration over time. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of the appearance of a bamboo building material 10 according to a first embodiment of the present invention; FIG. [Diagram 2] 1A and 1B are horizontal and vertical cross-sectional views of a bamboo building material 10 according to a first embodiment of the present invention. [Diagram 3] 2A-2C are horizontal and vertical cross-sectional views of a bamboo building material 20 according to a second embodiment of the present invention. [Figure 4] 1A and 1B are diagrams showing examples of use of bamboo building materials 10 and 20 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A bamboo building material 10 according to a first embodiment of the present invention will be described with reference to Figs.

[0010] FIG. 1 is an external perspective view of a bamboo building material 10 according to a first embodiment of the present invention, and FIG. 2 is a horizontal and vertical cross-sectional view of the bamboo building material 10 according to the first embodiment of the present invention.

[0011] The bamboo building material 10 according to the first embodiment of the present invention shown in Figures 1 and 2 is composed of a main body 1 made from felled bamboo with the nodes removed, and concrete 3 and bamboo fibers 5 contained inside the main body 1. Note that instead of or in addition to the concrete 3, tar derived from bamboo may also be contained.

[0012] <Main body 1> Natural bamboo is used as is for the main body 1. It is also preferable to use bamboo that has been soaked in bamboo vinegar for about one hour to one day to give it antiseptic and insect repellent properties for the main body 1. From the viewpoint of strength, it is preferable to use Moso bamboo, but bamboo other than Moso bamboo may also be used. Bamboo vinegar is produced by removing tar components from a liquid made by distilling the smoke generated by burning bamboo.

[0013] <Concrete 3> The concrete 3 may be a commonly used concrete (made of cement, sand, gravel, and water), but a more preferable composition is one in which bamboo powder is added to cement, sand, and gravel. By adding bamboo powder, the amount of cement, sand, and gravel can be reduced while maintaining strength, thereby reducing the weight. The amount of bamboo powder is preferably 30 to 50% by weight, but the amount of bamboo powder may be 50% or more, or 30% or less.

[0014] <Tar derived from bamboo> Tar derived from bamboo is produced either from the liquid distilled from the smoke produced by burning bamboo or from the residue left over from burning bamboo. Because bamboo tar has viscosity, it is possible to increase its strength by intertwining it with bamboo fibers, which will be described later.

[0015] <Bamboo fiber 5> The bamboo fiber 5 is preferably about 1 to 100 μm thick and 1 cm or longer, but may be 100 μm thick or more and 10 cm or shorter. The bamboo fiber 5 is produced by splitting the bamboo into small pieces and extracting the fibers. The fibers may be extracted through processes such as alkali treatment, steam treatment, and squeezing.

[0016] The bamboo building material 10 according to the first embodiment of the present invention can achieve an optimal balance between strength and weight by adjusting the amount of concrete 3 (tar derived from bamboo) and bamboo fiber 5 contained therein. For example, weight can be reduced by increasing the amount of bamboo fiber 5. The strength of the bamboo fiber 5 is synergistically improved by using concrete 3 and tar derived from bamboo.

[0017] Fig. 3 is a horizontal and vertical cross-sectional view of a bamboo building material 20 according to a second embodiment of the present invention. As shown in Fig. 3, the bamboo building material 20 according to the second embodiment of the present invention is configured with multiple bamboo boards 7 inside the bamboo building material 10 according to the second embodiment. It is also possible to configure the bamboo building material 20 with only one bamboo board 7, or to use a wooden board or metal such as reinforcing bars instead of the bamboo boards 7.

[0018] Figure 4 shows an example of using bamboo building materials 10, 20 according to an embodiment of the present invention as pillars for a building. As shown in Figure 4, the slab 100 has a hole 100a in the center, and the building foundation is constructed by fitting the building material 10 into the hole 100a. The slab 100 is made of concrete blocks, but it may also be made of concrete blocks made of cement, sand, gravel, and bamboo powder.

[0019] By using the bamboo building materials 10, 20 according to this embodiment, the following effects are achieved. (a) The commonly used wooden pillars can be changed to bamboo building materials10,20, so by using unused bamboo, the cost of building materials due to rising timber prices can be reduced. (i) Bamboo, which has strong anti-corrosive and anti-insect properties, can be used for the pillars, significantly extending the lifespan of the building. (c) Bamboo grows faster than wood, so it can contribute to reducing carbon dioxide emissions and realizing a sustainable society. [Explanation of symbols]

[0020] 10, 20 Bamboo building materials 1 Main unit 3. Cement 5. Bamboo Fiber 7 Bamboo board 100 Wall Foundation

Claims

1. This bamboo building material is made by filling the inside of bamboo with a mixture of bamboo fiber and cement or tar derived from bamboo.

2. A building constructed using the bamboo building material according to claim 1 as pillar material.

3. 3. The building according to claim 2, wherein the foundation is made of concrete containing bamboo powder and cement.

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