CN211114427U - Natural fiber composite pipe restraint recycled concrete post - Google Patents
Natural fiber composite pipe restraint recycled concrete post Download PDFInfo
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- CN211114427U CN211114427U CN201921537423.1U CN201921537423U CN211114427U CN 211114427 U CN211114427 U CN 211114427U CN 201921537423 U CN201921537423 U CN 201921537423U CN 211114427 U CN211114427 U CN 211114427U
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Abstract
The utility model provides a compound pipe restraint of natural fibre recycled concrete post, its characterized in that pours recycled concrete (1) in compound pipe of natural fibre (4) including recycled concrete (1), vertical bamboo muscle (2), bamboo timber stirrup (3), the compound pipe of natural fibre (4), natural short-staple (5), and internally arranged has vertical bamboo muscle (2), bamboo timber stirrup (3) in recycled concrete (1) to it has natural short-staple (5) to mix. The utility model relates to a compound tub restraint recycled concrete post of natural fibre, outside natural fibre compound tub is used for the confined concrete, and inside adoption recycled concrete replaces traditional concrete, and vertical bamboo muscle, bamboo timber stirrup replace traditional reinforcing bar, make full use of natural resources, the low carbon environmental protection, the resource can be regenerated, promotes sustainable development.
Description
Technical Field
The utility model relates to a restraint concrete structure, especially a natural fibre composite pipe restraint recycled concrete post belongs to civil construction technical field.
Background
Currently, reinforced concrete structures have been widely used in high-rise buildings, bridges, and heavy-duty structures. However, China is the largest building market all over the world, the demand of large concrete causes the sandstone to gradually show the trend of short supply and short demand, high-quality natural aggregate in many areas of China is exhausted, and a large amount of quarrying activities cause irreversible damage to the ecological environment; in addition, although the internal steel bars in the reinforced concrete structure well compensate the problem of low tensile strength of concrete and enhance the strength of concrete, the reinforced concrete structure also has the disadvantages of high cost and non-reproducibility, and the steel bars are easily corroded, so the application of the reinforced concrete structure in some special areas is limited to a certain extent.
According to statistics, the total amount of the waste concrete in the construction waste generated in China every year is over 12000 ten thousand tons, and the waste concrete occupies a large amount of land for stacking or landfill, so that the environmental pollution is also caused. The construction waste is broken and used as the recycled aggregate, so that the problem of shortage of natural aggregate resources can be solved, the regeneration and the cyclic utilization of concrete are realized, and the sustainable development of the construction industry is ensured. However, the recycled aggregate has high water absorption due to internal damage and a layer of old mortar adsorbed on the surface of the recycled aggregate, so that the strength, the shrinkage performance, the durability and the like of the prepared recycled concrete are poorer than those of common concrete, which is one of important reasons for restricting the popularization and the application of the recycled aggregate concrete.
In view of the above structure, researchers are also continuously developing new structural forms, and striving to overcome the disadvantages and shortcomings of the conventional reinforced concrete. For example, chinese patent No. 201510006354.1 discloses a "BP-FRP tube reinforced recycled concrete composite column and a method for preparing the same", in which an external BP-FRP tube makes internal core concrete in a three-dimensional stressed state, thereby improving the strength and deformability of the concrete. The external BP-FRP pipe constraint can improve the bearing capacity and durability of the reinforced concrete combined column, and the BP-FRP pipe with good ductility can improve the ductility and the earthquake resistance of the column. However, the fiber fabrics used in the FRP tubes in the structure are all made of artificial synthetic fiber fabrics by adopting a chemical processing method, the products and the waste materials are not recyclable, the processing process has high energy consumption and high price, a large amount of precious resources are consumed, and the environmental pollution is caused. In addition, the steel bars in the internal reinforced concrete are easy to rust and have poor fire resistance.
The utility model relates to an among the natural fibre composite pipe restraint recycled concrete post, outside natural fibre composite pipe is with continuous natural fibre strip as essential material to the resin is the gluing agent, adopts advanced winding technology processing to make natural fibre composite pipe. The constraint of the external natural fiber composite pipe enables the internal core concrete to be in a three-dimensional stress state, so that the strength and the deformation capacity of the concrete are improved, the energy consumption in the processing process is low, the pollution is low, the waste material can be recycled, the carbon is low, the environment is protected, the energy is saved, and the energy is saved and the emission is reduced.
The natural fiber composite pipe is internally provided with longitudinal bamboo ribs and bamboo stirrups which are low in cost, low in consumption and free of pollution, the traditional reinforcing steel bars are replaced for reinforcing concrete, the bamboo has a short growth period and can be mature for three to five years, the bamboo has very high tensile strength and is known as 'plant reinforcing steel bar', the ultimate tensile strength of certain varieties of bamboos is even similar to that of low-carbon steel, and the weight of the bamboo is much lighter than that of steel; in addition, the energy consumption for producing bamboo wood is far lower than that for producing steel, so that the energy consumption can be greatly reduced, natural resources are saved, and the pollution is reduced. Bamboo resources in China are quite rich, the area of a bamboo forest accounts for about one fourth of the total area of the world, and the measure of applying bamboo wood to a reinforced concrete structure also makes full use of the bamboo resources in China. In addition, natural short fibers are mixed in the recycled concrete, most of the fibers mixed in the concrete are artificial fibers and mineral fibers, but the natural short fibers and the mineral fibers do not have the advantages of green, environmental protection and economy, but are not green building materials. The natural fiber has the advantages of low cost, light weight, capability of decomposing under natural conditions and no pollution. In addition, the natural fiber has the characteristics of higher strength, corrosion resistance and acid and alkali resistance, has obvious effects of improving the compressive strength, the splitting tensile strength and the breaking strength of the recycled concrete, can effectively inhibit the shrinkage of the recycled concrete, and particularly has more obvious influence on the shrinkage of the early recycled concrete.
The utility model provides a natural fibre composite pipe restraint recycled concrete post to overcome the defect that exists among the prior art, satisfy the application needs of engineering.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a compound tub restraint recycled concrete post of natural fibre, with the present reinforced concrete structure's of phase solution defect, the restraint of the compound pipe of outside natural fibre makes inside core concrete be in the three-dimensional stress state, improve structure bearing capacity, inside has adopted recycled concrete to replace traditional concrete, vertical bamboo muscle, the bamboo timber stirrup replaces traditional reinforcing bar, with the phase solution energy resource consumption, the environmental pollution problem, the improvement to current recycled concrete structure simultaneously, natural short-staple has been doped in recycled concrete, the compressive strength of recycled concrete has been improved effectively, splitting tensile strength, the rupture strength.
Therefore, the utility model provides a natural fiber composite tube restraint recycled concrete column, which is characterized in that the structure comprises recycled concrete, longitudinal bamboo reinforcement, bamboo stirrup, natural fiber composite tube and natural short fiber; the natural fiber composite pipe is formed by mutually compounding a structural layer and an outer protective layer, the structural layer is formed by mutually and tightly winding natural fiber strips adhered with adhesives on a mould to be solidified and demoulded to form a tubular structure, the number of winding layers is specified according to design requirements, the outer protective layer is directly coated and solidified on the outer surface of the structural layer, a longitudinal bamboo rib is formed by processing and manufacturing composite bamboo or raw bamboo, the longitudinal bamboo rib is longitudinally arranged along the axis of the component, a bamboo hoop is formed by cutting a prefabricated bamboo composite pipe along the cross section, the bamboo hoop is perpendicular to the longitudinal bamboo rib at intervals, the longitudinal bamboo rib and the bamboo hoop are arranged in the natural fiber composite pipe, recycled concrete is poured in the natural fiber composite pipe, and natural short fibers are doped in the recycled concrete.
The utility model discloses an in the structure, natural fiber strip winding direction along the hoop direction of natural fiber composite pipe, the natural fiber strip is one of bamboo fiber strip, flax fiber strip, jute fiber strip, sisal fiber strip.
The thickness of the natural fiber composite pipe is 10 mm-150 mm, and the cross section of the natural fiber composite pipe is in one of a circular shape, an oval shape or a round end shape.
The prefabricated bamboo composite pipe is formed by winding bamboo strip strips or bamboo skins adhered with adhesives on a mould, curing and demoulding, wherein the bamboo strip strips are of a strip-shaped structure formed by connecting a plurality of bamboo strips through braided wires.
The adhesive is one of epoxy resin, vinyl resin and polyurethane resin.
The outer protective layer is made of one of epoxy mortar and cement-based composite materials.
The section shape of the longitudinal bamboo rib is one of square, round or other polygons, the section shape of the bamboo hoop rib is one of round, oval or round end shapes, and the sectional area of the single longitudinal bamboo rib is not less than 150mm2The section area of the bamboo stirrup is not less than 20mm2。
The natural short fiber is formed by mixing one or more of bamboo fiber, flax fiber, jute fiber, sisal fiber and coconut fiber, and the length of the natural short fiber is 8-20 mm.
The utility model discloses not only fully embodied natural fibre composite pipe, recycled concrete, bamboo timber and the respective advantage of natural short-staple, more fully exerted the beneficial effect that the interact brought between them. In general, compared with the prior art, the technical scheme of the invention mainly has the following technical advantages:
(1) the external natural fiber composite pipe provides a hoop force for the recycled concrete, the stress performance of the structure is obviously improved, the bearing capacity and the rigidity of a recycled concrete member are improved, the excellent anti-seismic performance is achieved, and the external protective layer on the outer surface has good durability, so that the service life of the structure is prolonged. In addition, the natural fiber composite pipe is manufactured by using a continuous natural fiber strip as a base material, using resin as an adhesive and adopting an advanced winding process. The processing technology is basically carried out at normal temperature and normal pressure, so that the quality control is convenient, the three wastes are not discharged in the production process, and the method has the characteristics of low carbon, environmental protection, energy conservation, emission reduction and the like; the processing process has strong operability, low energy consumption, little environmental pollution, recyclable waste materials and the like.
(2) The natural fiber composite pipe can be used as a template for pouring a concrete structure, so that the use cost of the template is saved, the construction efficiency can be greatly improved, and the hoisting and the design are convenient.
(3) Compared with a reinforced concrete structure, the longitudinal bamboo reinforcement and the bamboo stirrup used for reinforcing the regenerative concrete structure reduce the use of steel, and the bamboo has rich resources, reproducibility, low production energy consumption, energy conservation and environmental protection.
(4) The natural short fibers in the recycled concrete have obvious effects of improving the compressive strength, the splitting tensile strength and the breaking strength of the recycled concrete, and can also effectively inhibit the shrinkage of the recycled concrete.
Description of the drawings:
FIG. 1 is a schematic partial cross-sectional view of a three-dimensional structure of a natural fiber composite tube confined recycled concrete column;
FIG. 2 is a schematic diagram of a circular cross-sectional structure of a natural fiber composite tube confined recycled concrete column;
FIG. 3 is a schematic diagram of an elliptical cross-sectional structure of a natural fiber composite tube confined recycled concrete column;
FIG. 4 is a schematic diagram of a round-end cross-sectional structure of a natural fiber composite tube confined recycled concrete column;
in the attached drawings, 1 is recycled concrete, 2 is a longitudinal bamboo reinforcement, 3 is a bamboo hoop reinforcement, 4 is a natural fiber composite pipe, 41 is a structural layer, 42 is an outer protective layer, and 5 is natural short fiber.
The specific implementation mode is as follows:
in order to clearly understand the technical features, objects and effects of the present invention, the present invention will be further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Firstly, a layer of demoulding film is wrapped on a mould, then a natural fiber strip adhered with an adhesive is wound on the mould, the winding direction of the natural fiber strip is along the circumferential direction of a natural fiber composite pipe, the number of winding layers is not limited and can be 0 layer, 1 layer or more than 1 layer, and the adhesive can be one of epoxy resin, vinyl resin and polyurethane resin. And after all winding operations are finished, curing the steel pipe, then demolding, and after demolding is finished, coating epoxy mortar or cement-based composite material on the outer surface of the structural layer to obtain the natural fiber composite pipe.
And then, arranging longitudinal bamboo ribs and bamboo stirrups in the natural fiber composite pipe. The longitudinal bamboo reinforcement is made of composite bamboo or original bamboo by processing according to a design size, the longitudinal bamboo reinforcement is longitudinally arranged along the axis of a component, the bamboo stirrup is formed by cutting a prefabricated bamboo composite pipe along the cross section, the prefabricated bamboo composite pipe is formed by winding bamboo strips adhered with adhesives or bamboo skins on a mold, curing and demolding are carried out to form the prefabricated bamboo composite pipe, the bamboo strips are strip-shaped structures formed by connecting a plurality of bamboo strips through braided wires, the bamboo stirrup is arranged at intervals vertical to the longitudinal bamboo reinforcement, and the bamboo stirrups and the longitudinal bamboo reinforcement form a bamboo reinforcement framework.
And finally, pouring the well-matched recycled concrete doped with the natural short fibers into the natural fiber composite pipe to form the natural fiber composite pipe constraint recycled concrete column.
Example (b):
as shown in fig. 1, a natural fiber composite tube-constrained recycled concrete column is characterized in that the structure comprises recycled concrete 1, longitudinal bamboo reinforcement 2, bamboo stirrups 3, natural fiber composite tubes 4 and natural short fibers 5; the natural fiber composite pipe 4 is formed by mutually compounding a structural layer 41 and an outer protective layer 42, the structural layer 41 is formed by mutually and tightly winding natural fiber strips adhered with adhesives on a mold to be cured and demolded to form a tubular structure, the number of winding layers is specified according to design requirements, the outer protective layer 42 is directly coated and cured on the outer surface of the structural layer 41, the longitudinal bamboo rib 2 is formed by processing and manufacturing composite bamboo or raw bamboo, the longitudinal bamboo rib 2 is longitudinally arranged along the axis of the component, the bamboo hoop rib 3 is formed by cutting the prefabricated bamboo composite pipe along the cross section, the bamboo hoop rib 3 is perpendicular to the longitudinal bamboo rib 2 and is arranged at intervals, the longitudinal bamboo rib 2 and the bamboo hoop rib 3 are arranged in the natural fiber composite pipe, finally, recycled concrete 1 is poured in the natural fiber composite pipe 4, and natural short fibers 5 are doped in the recycled concrete 1.
In specific implementation, the winding direction of the natural fiber strips is along the circumferential direction of the natural fiber composite pipe 4, and the natural fiber strips are one of bamboo fiber strips, flax fiber strips, jute fiber strips and sisal fiber strips.
As described above, the thickness of the natural fiber composite pipe 4 is 10mm to 150mm, and the cross-sectional shape of the natural fiber composite pipe 4 is one of a circular shape, an oval shape, and a round end shape.
The prefabricated bamboo composite pipe is formed by winding bamboo strip strips or bamboo skins adhered with adhesives on a mould, curing and demoulding, wherein the bamboo strip strips are of a strip-shaped structure formed by connecting a plurality of bamboo strips through braided wires.
The adhesive is one of epoxy resin, vinyl resin and polyurethane resin.
As described above, the outer protective layer 42 is made of one of epoxy mortar and cement-based composite material.
As mentioned above, the cross-sectional shape of the longitudinal bamboo reinforcement 2 is one of square, round or other polygons, the cross-sectional shape of the bamboo stirrup 3 is one of round, oval or round end, and the cross-sectional area of the single longitudinal bamboo reinforcement 2 is not less than 150mm2The section area of the bamboo stirrup 3 is not less than 20mm2。
As mentioned above, the natural short fiber 5 is one or a mixture of several of bamboo fiber, flax fiber, jute fiber, sisal fiber and coir fiber, and the length of the natural short fiber 5 is 8 mm-20 mm.
Claims (8)
1. A natural fiber composite tube restraint recycled concrete column is characterized by comprising recycled concrete (1), longitudinal bamboo ribs (2), bamboo stirrups (3), natural fiber composite tubes (4) and natural short fibers (5); wherein, the natural fiber composite pipe (4) is composed of a structural layer (41) and an outer protective layer (42) which are mutually compounded, the structural layer (41) is formed by mutually and tightly winding natural fiber strips adhered with adhesives on a mould to be solidified and demoulded to form a tubular structure, the number of winding layers is specified according to design requirements, the outer protective layer (42) is directly coated and solidified on the outer surface of the structural layer (41), a longitudinal bamboo reinforcement (2) is processed and manufactured by composite bamboo or raw bamboo, the longitudinal bamboo reinforcement (2) is longitudinally arranged along the axis of a component, a bamboo stirrup (3) is formed by cutting the prefabricated bamboo composite pipe along the cross section, the bamboo stirrup (3) is perpendicular to the longitudinal bamboo reinforcement (2) and is arranged at intervals, the longitudinal bamboo reinforcement (2) and the bamboo stirrup (3) are arranged in the natural fiber composite pipe, and recycled concrete (1) is poured in the natural fiber composite pipe (4), the recycled concrete (1) is doped with natural short fibers (5).
2. The column as claimed in claim 1, wherein the natural fiber composite pipe is wound in a circumferential direction of the natural fiber composite pipe (4), and the natural fiber strips are one of bamboo fiber strips, flax fiber strips, jute fiber strips and sisal fiber strips.
3. The column as claimed in claim 1, wherein the natural fiber composite tube (4) has a thickness of 10 mm-150 mm, and the natural fiber composite tube (4) has a cross-sectional shape of one of a circular, oval or round end shape.
4. The natural fiber composite tube confined recycled concrete column as claimed in claim 1, wherein the prefabricated bamboo composite tube is formed by winding bamboo strips adhered with an adhesive or bamboo skins on a mold, curing and demolding, wherein the bamboo strips are in a strip-shaped structure formed by connecting a plurality of bamboo strips through braided wires.
5. A natural fiber composite tube confined recycled concrete column as claimed in claim 1 and claim 4, characterized in that said adhesive is one of epoxy resin, vinyl resin, polyurethane resin.
6. The column as claimed in claim 1, wherein the outer protective layer (42) is made of one of epoxy mortar and cement-based composite material.
7. The natural fiber composite pipe confined recycled concrete column as claimed in claim 1, wherein the cross-sectional shape of the longitudinal bamboo rib (2) is one of circular or polygonal, the cross-sectional shape of the bamboo hoop rib (3) is one of circular, elliptical or round end, and the cross-sectional area of the single longitudinal bamboo rib (2) is not less than 150mm2The section area of the bamboo stirrup (3) is not less than 20mm2。
8. The column as claimed in claim 1, wherein the natural fiber composite tube restrained recycled concrete column is characterized in that the natural short fiber (5) is one of bamboo fiber, flax fiber, jute fiber, sisal fiber and coir fiber, and the length of the natural short fiber (5) is 8 mm-20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921537423.1U CN211114427U (en) | 2019-09-11 | 2019-09-11 | Natural fiber composite pipe restraint recycled concrete post |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921537423.1U CN211114427U (en) | 2019-09-11 | 2019-09-11 | Natural fiber composite pipe restraint recycled concrete post |
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| Publication Number | Publication Date |
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| CN211114427U true CN211114427U (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921537423.1U Expired - Fee Related CN211114427U (en) | 2019-09-11 | 2019-09-11 | Natural fiber composite pipe restraint recycled concrete post |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116575945A (en) * | 2023-07-14 | 2023-08-11 | 长春黄金研究院有限公司 | High-strength yielding support structure for underground mine support and use method thereof |
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2019
- 2019-09-11 CN CN201921537423.1U patent/CN211114427U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116575945A (en) * | 2023-07-14 | 2023-08-11 | 长春黄金研究院有限公司 | High-strength yielding support structure for underground mine support and use method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20200728 Termination date: 20210911 |