A restrained tube filled bamboo aggregate structure

Abstract

A kind of constraint pipe fills bamboo aggregate structure, including constraint pipe, bamboo aggregate and adhesive, the cavity inside constraint pipe is hollow, bamboo aggregate is the block granule that the original bamboo is cut into, and the length-diameter ratio is 1-3, size is 2mm-30mm, bamboo aggregate is pre-soaked adhesive, then the bamboo aggregate that is soaked with adhesive is compactly filled in the cavity of constraint pipe after pressure treatment, and the bamboo aggregate that is compactly filled is flush with the top surface of constraint pipe.The present application is cut into new type bamboo aggregate with renewable and sustainable bamboo, replaces concrete as building raw material and fills in constraint pipe material, not only saves concrete consumption, cost is low, green environmental protection, improves the utilization rate of bamboo, and the structure is light in weight, has good heat preservation performance, good deformation performance, strong bearing capacity, good rigidity, good ductility, excellent anti-seismic performance, good corrosion resistance.

Description

Technical Field

[0001] This invention relates to a bamboo aggregate-filled confined tube structure, applicable to column structures in various buildings, and belongs to the field of civil engineering structure technology. Background Technology

[0002] Bamboo has become a promising and noteworthy building material due to its environmental friendliness, sustainability, and ease of recycling. Bamboo grows rapidly, reaching harvest time within 3-5 years. From a construction perspective, bamboo is easy to process and meets building safety requirements. Furthermore, it is lightweight, has low shrinkage, high modulus of elasticity, and high radial tensile strength. Compared to other common construction materials such as wood, wood-based composites, steel reinforcement, and concrete, bamboo has a higher specific strength. Its texture and hollow structure give it excellent thermal insulation properties. Bamboo has a very low thermal conductivity, significantly lower than brick, stone, concrete, and other materials. As a lightweight material, bamboo saves costs during construction and maximizes local labor by reducing the use of large-scale machinery. Therefore, bamboo is considered a sustainable material that can serve as a competitive and environmentally friendly alternative to non-renewable and polluting materials such as steel and concrete.

[0003] However, natural bamboo has drawbacks such as anisotropy, uneven size, susceptibility to cracking, and poor durability. Directly using raw bamboo in bamboo structures cannot meet the basic requirements of modern building structures for material mechanical properties. Therefore, existing processing techniques are used to process bamboo into composite materials with stable mechanical properties to resolve these contradictions. As a result, various bamboo engineering materials with excellent mechanical properties have been developed. However, engineered bamboo components still suffer from low cross-sectional stiffness, insufficient load-bearing capacity, and insufficient spanning capacity. To address these issues, researchers have proposed various reinforced bamboo component construction forms, including reinforced bamboo components, I-beam bamboo components, FRP-reinforced bamboo components, bamboo-concrete composite components, and bamboo-metal composite components. Compared to reinforced concrete structures, modern bamboo structures are lightweight, have good deformation performance, good toughness, are less affected by seismic forces, and can effectively absorb energy.

[0004] In light of the above research background, researchers are constantly developing new bamboo structural forms to improve the utilization rate of bamboo and overcome the shortcomings of bamboo structures. For example, Chinese patent CN103306427A discloses a hollow bamboo steel fiber reinforced concrete beam or column component, including an FRP pipe, steel fiber reinforced concrete, and a hollow bamboo tube. The FRP pipe is placed on the outermost side of the hollow bamboo steel fiber reinforced concrete beam or column component, the hollow bamboo tube is placed inside the FRP pipe, and the steel fiber reinforced concrete is placed between the FRP pipe and the hollow bamboo tube. This structure does not treat the raw bamboo material, and the durability of the raw bamboo tube and its adhesion to concrete need to be verified. Another example is Chinese patent CN205063182U, which discloses a steel pipe-bamboo integrated hollow column. The core of the column is a one-piece molded steel material, and the outer layer of the column is sheet-like bamboo material. The integrated hollow column is horizontally penetrated and fixed using bolts. This structure is relatively complex, but this fixing method may be unreliable, leading to deformation of the specimen. Summary of the Invention

[0005] The purpose of this invention is to provide a confined tube filled with bamboo aggregate structure. This structure uses renewable and sustainable bamboo to cut into new bamboo aggregate and impregnate it with adhesive. Then, the bamboo aggregate replaces concrete as a building material to fill the confined tube through hot pressing or cold pressing. This not only saves concrete, reduces costs, is environmentally friendly, and improves the utilization rate of bamboo, but also has the advantages of being lightweight, having good thermal insulation performance, good deformation performance, strong load-bearing capacity, good stiffness, good ductility, excellent seismic performance, and good corrosion resistance.

[0006] The technical solution of this invention is as follows: a constraint tube filled with bamboo aggregate structure, characterized in that it includes a constraint tube, bamboo aggregate, and adhesive. The cavity of the constraint tube is hollow. The bamboo aggregate consists of block-shaped particles cut from raw bamboo with a length-to-diameter ratio of 1 to 3 and a size of 2 mm to 30 mm. The bamboo aggregate is pre-soaked in adhesive, and then the adhesive-soaked bamboo aggregate is pressurized and densely filled into the cavity of the constraint tube. The densely filled bamboo aggregate is flush with the top surface of the constraint tube. The pressurization process is performed using either hot pressing or cold pressing. When using hot pressing, the hot pressing temperature is 100℃ to 200℃, the hot pressing pressure is 0.1 MPa to 5.0 MPa, and the hot pressing time is 0.1 to 1.5 min. The pressure remains constant during hot pressing, and the bamboo aggregate impregnated with adhesive is cured and molded into a single unit with the constraint tube during hot pressing. When using cold pressing, the cold pressing temperature is 10℃~60℃, the cold pressing pressure is 0.5MPa~6.0MPa, and the cold pressing time is 0.1~2.0min / mm. After cold pressing, the bamboo aggregate impregnated with adhesive is pinned and fixed into a single unit with the constraint tube, and then cured at a high temperature of 100℃~200℃. The bamboo aggregate impregnated with adhesive is cured and molded into a single unit with the constraint tube. The adhesive used to impregnate the bamboo aggregate is one of epoxy resin, epoxy mortar, phenolic resin, polyethylene resin, or furfuryl alcohol resin, and the impregnation time is 10min~30min.

[0007] The moisture content of the bamboo aggregate is 6% to 12%.

[0008] The bamboo aggregate is in the shape of a cube, cuboid, polygon, or sphere.

[0009] The restraint tube is made of one of the following materials: ordinary carbon steel pipe, stainless steel pipe, galvanized steel pipe, aluminum pipe, copper pipe, plastic pipe, composite material pipe, or bamboo pipe.

[0010] The surface of the constraint tube is provided with circumferential corrugations, which are distributed at intervals along the longitudinal direction.

[0011] The cross-sectional shape of the constraint tube is one of the following: circular, elliptical, rectangular, chamfered rectangle, or polygon with more than 4 sides. The chamfer radius R of the chamfered rectangle is greater than or equal to 25mm.

[0012] The aforementioned constraint tube is either a single-layer tube or a multi-layer tube.

[0013] The wall thickness of the constraint tube is 1mm to 20mm, and the height-to-diameter ratio is 2 to 15.

[0014] One or more of wood blocks, coconut shells, straw, and rice straw are added to the gaps between the bamboo aggregate and filled into the cavity of the constraint tube.

[0015] The gaps between the bamboo aggregates are filled with cementitious materials, fine aggregates, inorganic coarse aggregates, and admixtures. The cementitious material is one of ordinary cement, silicate cement, magnesium cement, aluminate cement, slag cement, or fly ash cement. The fine aggregate is one of natural sand or artificial sand with a particle size of less than 4.75 mm. The inorganic coarse aggregate is one of crushed stone, pebbles, or ceramsite with a nominal particle size of 5 mm to 40 mm. The admixture is one of water-reducing agent, early-strength agent, retarder, air-entraining agent, or thickener. The cementitious material, fine aggregates, inorganic coarse aggregates, and admixtures are mixed with water and solidified with the bamboo aggregates to fill the cavity of the confinement tube.

[0016] This invention has significant advantages and the following beneficial effects:

[0017] (1) Replacing concrete filling with bamboo, which is derived from nature, renewable and sustainable, is green and environmentally friendly, greatly improving the utilization rate of bamboo. This is in line with my country's national conditions of vigorously promoting green buildings and sustainable building materials, and also meets the national policy requirements of "resource-saving" and "environmentally friendly".

[0018] (2) Compared with steel and concrete, bamboo aggregate is lightweight, has high specific strength and low thermal conductivity. When bamboo is soaked in adhesive and filled into the confined pipe, the resulting structure has good thermal insulation performance, light weight, good deformation performance, strong load-bearing capacity, good rigidity, good ductility, excellent seismic performance and good corrosion resistance.

[0019] (3) Bamboo is a lightweight material that is inexpensive and easy to process. Using it as a building material saves costs and reduces the structural weight during construction. Attached image description:

[0020] Figure 1 This is a schematic diagram of the elevation of a bamboo aggregate structure with a constrained tube filling (circumferential corrugated surface);

[0021] Figure 2 This is a schematic diagram of the cross-section of a circular cross-section constrained tube filled with bamboo aggregate.

[0022] Figure 3 This is a schematic diagram of the cross-section of a rectangular cross-section constrained tube filled with bamboo aggregate.

[0023] Figure 4 This is a schematic diagram of the cross-section of a confined tube filled with bamboo aggregate with a chamfered rectangular cross-section; Detailed implementation method:

[0024] The specific embodiments of the present invention are further described below. A constraint tube filled with bamboo aggregate structure is characterized by comprising a constraint tube 1, bamboo aggregate 2, and adhesive. The cavity of the constraint tube 1 is hollow. The bamboo aggregate 2 consists of block-shaped particles cut from raw bamboo, with a length-to-diameter ratio of 1-3 and a size of 2mm-30mm. The bamboo aggregate 2 is pre-soaked in adhesive, and then the adhesive-soaked bamboo aggregate 2 is pressurized and densely filled into the cavity of the constraint tube 1. The densely filled bamboo aggregate 2 is flush with the top surface of the constraint tube 1. The pressurization process employs either hot pressing or cold pressing. When using hot pressing, the hot pressing temperature is 100℃-200℃, the hot pressing pressure is 0.1MPa-5.0MPa, and the hot pressing time is 0.1-1.5min. / mm, the pressure remains constant during the hot pressing process, and the bamboo aggregate impregnated with adhesive is cured and formed into a single unit with the constraint tube during the hot pressing process; when using the cold pressing method, the cold pressing temperature is 10℃~60℃, the cold pressing pressure is 0.5MPa~6.0MPa, and the cold pressing time is 0.1~2.0min / mm. After cold pressing, the bamboo aggregate impregnated with adhesive is pinned and fixed into a single unit with the constraint tube 1, and then cured at a high temperature of 100℃~200℃. The bamboo aggregate impregnated with adhesive is cured and formed into a single unit with the constraint tube; the adhesive for impregnating bamboo aggregate 2 is one of epoxy resin, epoxy mortar, phenolic resin, polyethylene resin, or furfuryl alcohol resin, and the impregnation time is 10min~30min.

[0025] The moisture content of bamboo aggregate 2 is 6% to 12%.

[0026] The shape of bamboo material 2 is one of cube, cuboid, polygon, or sphere.

[0027] The material of the restraint tube 1 is one of the following: ordinary carbon steel pipe, stainless steel pipe, galvanized steel pipe, aluminum pipe, copper pipe, plastic pipe, composite material pipe, or bamboo pipe.

[0028] The surface of the constraint tube 1 is provided with circumferential corrugations, which are distributed at intervals along the longitudinal direction.

[0029] The cross-sectional shape of the constraint tube 1 is one of the following: circular, elliptical, rectangular, chamfered rectangle, or polygon with more than 4 sides. The chamfer radius R of the chamfered rectangle is greater than or equal to 25mm.

[0030] Constraint tube 1 is a type of single-layer or multi-layer tube.

[0031] The wall thickness of the constraint tube 1 is 1mm to 20mm, and the height-to-diameter ratio is 2 to 15.

[0032] One or more of wood blocks, coconut shells, straw, and rice straw are added to the gaps in the bamboo material 2 and used to fill the cavity of the constraint tube 1.

[0033] Cementitious materials, fine aggregates, inorganic coarse aggregates, and admixtures are added to the gaps of bamboo aggregate 2. The cementitious material is one of ordinary cement, silicate cement, magnesium cement, aluminate cement, slag cement, or fly ash cement. The fine aggregate is one of natural sand or artificial sand with a particle size of less than 4.75 mm. The inorganic coarse aggregate is one of crushed stone, pebbles, or ceramsite with a nominal particle size of 5 mm to 40 mm. The admixture is one of water-reducing agent, early-strength agent, retarder, air-entraining agent, or thickener. The cementitious material, fine aggregates, inorganic coarse aggregates, and admixtures are mixed with water and solidified with bamboo aggregate 2 to fill the cavity of the constraint tube 1.

[0034] In this invention, the combined application of novel bamboo aggregate and constraint tubing makes full use of my country's sustainable bamboo resources, resulting in an economical, durable, and high-performance novel structure.

Claims

1. A bamboo aggregate-filled confined tube structure, characterized in that, The system includes a constraint tube (1), bamboo aggregate (2), and adhesive. The cavity of the constraint tube (1) is hollow. The bamboo aggregate (2) consists of granular blocks of raw bamboo with a length-to-diameter ratio of 1 to 3 and a size of 2 mm to 30 mm. The bamboo aggregate (2) is pre-soaked in adhesive. After being pressurized, the adhesive-soaked bamboo aggregate (2) is densely filled into the cavity of the constraint tube (1). The densely filled bamboo aggregate (2) is flush with the top surface of the constraint tube (1). The pressurization process is carried out by either hot pressing or cold pressing. When using hot pressing, the hot pressing temperature is 100℃ to 200℃, the hot pressing pressure is 0.1 MPa to 5.0 MPa, and the hot pressing time is 0.1 to 1.5 min / mm. During the hot pressing process, the pressure remains constant. The bamboo skeleton impregnated with adhesive is cured and formed into a single unit with the constraint tube during the hot pressing process. When the cold pressing method is used, the cold pressing temperature is 10℃~60℃, the cold pressing pressure is 0.5MPa~6.0MPa, and the cold pressing time is 0.1~2.0min / mm. After cold pressing, the bamboo skeleton impregnated with adhesive is pinned and fixed into a single unit with the constraint tube (1). Then, it is cured at a high temperature of 100℃~200℃. The bamboo skeleton impregnated with adhesive is cured and formed into a single unit with the constraint tube. The adhesive for the bamboo skeleton (2) is one of epoxy resin, epoxy mortar, phenolic resin, polyethylene resin, or furfuryl alcohol resin. The impregnation time is 10min~30min.

2. The bamboo aggregate filling structure with a constraint tube as described in claim 1, characterized in that... The moisture content of the bamboo aggregate (2) is 6% to 12%.

3. The bamboo aggregate filling structure with a constraint tube as described in claim 1, characterized in that... The bamboo material (2) is in the shape of a cube, cuboid, polygon, or sphere.

4. The bamboo aggregate filling structure with a constraint tube as described in claim 1, characterized in that... The material of the constraint tube (1) is one of the following: ordinary carbon steel tube, stainless steel tube, galvanized steel tube, aluminum tube, copper tube, plastic tube, composite material tube, or bamboo tube.

5. A bamboo aggregate filling structure for constrained tubes as described in claim 1, characterized in that... The surface of the constraint tube (1) is provided with circumferential corrugations, which are distributed at intervals along the longitudinal direction.

6. The bamboo aggregate filling structure with a constraint tube as described in claim 1, characterized in that... The cross-sectional shape of the constraint tube (1) is one of the following: circular, elliptical, rectangular, chamfered rectangle or polygon with more than 4 sides, and the chamfer radius R of the chamfered rectangle is greater than or equal to 25mm.

7. A bamboo aggregate-filled confined tube structure as described in claim 1, characterized in that... The constraint tube (1) is a single-layer tube or a multi-layer tube.

8. A bamboo aggregate-filled confined tube structure as described in claim 1, characterized in that... The wall thickness of the constraint tube (1) is 1mm to 20mm, and the height-to-diameter ratio is 2 to 15.

9. A bamboo aggregate filling structure for constrained tubes as described in claim 1, characterized in that... One or more of wood blocks, coconut shells, straw, and rice straw are added to the gaps of the bamboo aggregate (2) and are used to fill the cavity of the constraint tube (1).

10. A bamboo aggregate-filled confined tube structure as described in claim 1, characterized in that... Cementitious material, fine aggregate, inorganic coarse aggregate, and admixture are added to the gaps of the bamboo aggregate (2); the cementitious material is one of ordinary cement, silicate cement, magnesium cement, aluminate cement, slag cement, and fly ash cement; the fine aggregate is one of natural sand and artificial sand with a particle size of less than 4.75 mm; the inorganic coarse aggregate is one of crushed stone, pebble, and ceramsite with a nominal particle size of 5 mm to 40 mm; the admixture is one of water-reducing agent, early strength agent, retarder, air-entraining agent, and thickener; the cementitious material, fine aggregate, inorganic coarse aggregate, and admixture are solidified with the bamboo aggregate (2) by adding water and stirring, and then filled into the cavity of the constraint tube (1).

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