Composite regenerated keel

Abstract

The present invention relates to the technical field of building wood, and provides a composite regenerated keel, comprising: a wood core structure (1), which is composed of multiple layers of wood core (2) stacked; a first fixing structure (3), which is arranged between the wood cores (2) of each layer, and fixes and connects the wood cores (2) of each layer; a second fixing structure (4), which is wrapped and tied around the outer periphery of the wood core structure (1), and fixes the wood core structure (1); a third fixing structure (5), which is arranged around the outer periphery of the second fixing structure (4) and the wood core structure (1), and is thermoplastically formed with the wood core structure (1). According to the scheme of the present invention, the present invention can prevent the brittle bending fracture of the keel wood core, increase the structural ductility, and improve the shear and bending strength of the keel structure; at the same time, it can reduce the contact between wood and polypropylene resin materials and air, increase the durability of the keel structure, improve the material turnover rate, realize the resource recycling of waste materials, and be more low-carbon and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of building wood, in particular to a composite regenerated keel. Background Art

[0002] With the continuous advancement of urbanization in my country, the process of engineering construction needs to consider not only engineering safety, quality and progress, but also its engineering economy. Directly related to engineering economy is the control of turnover materials during project implementation, and the keel system is an important link in the control of turnover materials. Traditional keel systems mostly use wooden squares, which are widely used in various types of concrete formwork supports because of their strong corrosion resistance and certain bending resistance. However, traditional building wooden squares have brittle failure, which poses certain risks in practical applications; moreover, in the actual engineering construction process, wooden squares are easy to break and have a low turnover rate. A large number of wooden square keels have the problem of short service life and eventually become construction waste. The abandonment of wooden square keels leads to the waste of wood resources and increases the economic cost of engineering. Therefore, the common problem of unsustainable utilization of waste wooden square keels in the existing construction industry system still exists, and how to sustainably utilize waste wooden square keels remains a research focus. At the same time, the realization of the "dual carbon" goal also puts forward more stringent requirements for concrete building construction, and the work of saving and substituting wood in the field of construction is imperative. Summary of the invention

[0003] The purpose of the present invention is to solve at least one technical problem in the background technology and provide a composite regenerated keel.

[0004] To achieve the above object, the present invention provides a composite regenerated keel, comprising:

[0005] Wood core structure, consisting of multiple layers of wood core stacked together;

[0006] A first fixing structure is arranged between the wood cores of each layer to fix and connect the wood cores of each layer;

[0007] A second fixing structure is wrapped and tied around the outer periphery of the wood core structure to fix the wood core structure;

[0008] The third fixing structure is arranged on the periphery of the second fixing structure and the wood core structure, and is thermoplastically formed with the wood core structure.

[0009] According to one aspect of the present invention, the first fixing structure is made of polypropylene.

[0010] According to one aspect of the present invention, the second fixing structure is a high-strength polyester yarn, and the high-strength polyester yarn is evenly wrapped and tied to the periphery of the wooden core structure at an angle of 60° and an interval of 3 cm along the length direction of the wooden core structure;

[0011] The high-strength polyester yarn is resistant to high temperatures of 300° C., and the outer side of the high-strength polyester yarn is heat-pressed with a polypropylene resin composite material at a heating temperature of 80° C. by a heat press.

[0012] According to one aspect of the present invention, the third fixing structure includes at least two polymer composite layers stacked and wrapped around the second fixing structure and the wood core structure.

[0013] According to one aspect of the present invention, the third fixing structure comprises: a first polymer composite layer and a second polymer composite layer;

[0014] The first polymer composite layer is wrapped around the periphery of the wood core structure and the second fixing structure;

[0015] The second polymer composite layer is wrapped around the periphery of the first polymer composite layer.

[0016] According to one aspect of the present invention, the third fixing structure further comprises: a first connection layer and a second connection layer;

[0017] The first connecting layer is disposed between the first polymer composite layer, the wood core structure and the second fixing structure, and connects the first polymer composite layer, the wood core structure and the second fixing structure;

[0018] The second connecting layer is disposed between the first polymer composite layer and the second polymer composite layer to connect the first polymer composite layer and the second polymer composite layer;

[0019] The first connecting layer and the second connecting layer are made of polypropylene.

[0020] According to one aspect of the present invention, the first polymer composite layer and the second polymer composite layer are formed by pre-impregnation of high-strength fibers and polypropylene, the polymer composite layer has a tensile strength of >800 MPa, a fiber content of >70%, and a thickness of 0.2 mm.

[0021] According to one aspect of the present invention, the tensile strength of the polypropylene is greater than 20 MPa, the elongation at break is greater than 30%, the bending strength is greater than 30 MPa, and the notched impact is greater than 150 J.

[0022] According to one aspect of the present invention, it further includes: a rough surface, wherein the rough surface is arranged on the outer wall of the third fixing structure.

[0023] According to one aspect of the present invention, the rough surface is formed by a temperature reduction embossing process.

[0024] According to one aspect of the present invention, each layer of the wood core is provided with a conical grouting hole, and each conical grouting hole is concentrically arranged with its edges aligned.

[0025] According to one aspect of the present invention, the cross-sectional shape of each of the tapered grouting holes is rhombus-like, the diameter of the smaller hole in each of the tapered grouting holes is 6 mm, the diameter of the larger hole is 8 mm, and the height of each of the tapered grouting holes is 70 mm;

[0026] Along the length direction of the wood core, corresponding conical grouting holes are arranged on each layer of the wood core at intervals of 200 mm.

[0027] According to one solution of the present invention, the composite regenerated keel comprises: a wood core structure, which is composed of multiple layers of wood core stacked; a first fixing structure, which is arranged between each layer of wood core, and fixes each layer of wood core to each other; a second fixing structure, which is wrapped and tied around the periphery of the wood core structure, and fixes the wood core structure; a third fixing structure, which is arranged around the periphery of the second fixing structure and the wood core structure, and is thermoplastically formed with the wood core structure. In this way, the first fixing structure can be used to connect each layer of wood core together, forming a connection foundation for each layer of wood core stacked up and down, thereby ensuring the basic connection strength. Then, the second fixing structure is used to wrap and tie from the periphery of the wood core structure (i.e., the outer wall in the length direction), so that on the basis of the first fixing structure, the wood core structure is further fixed from the outside to form a whole with higher strength. Furthermore, the third fixing structure is used to wrap the second fixing structure and the wood core structure from the periphery (i.e., the outer wall of the wood core structure in the length direction and the outer wall of the second fixing structure tied to the outer wall of the wood core structure), and the third fixing structure and the wood core structure are formed into a wood-plastic integrated overall rigid structure through thermoplastic molding, so that the structural strength and rigidity after being wrapped by the third fixing structure are higher, the overall performance of the keel is effectively improved, and the problems of brittle failure and low utilization rate of traditional square wood keels are solved.

[0028] According to one solution of the present invention, the first fixing structure is made of polypropylene. In this way, the wood core layers can be bonded together into a whole through the first fixing structure by thermoplastic molding, thereby ensuring the basic connection strength, and ensuring the tightness and stability of the stacked wood core connection.

[0029] According to one solution of the present invention, the second fixed structure is a high-strength polyester yarn, which is evenly wound and tied around the periphery of the wood core structure at an angle of 60° and 3 cm intervals along the length direction of the wood core structure; the high-strength polyester yarn is resistant to high temperatures of 300°C, and the outer side of the high-strength polyester yarn is hot-pressed with a polypropylene resin composite material by a hot press at a heating temperature of 80°C. In this arrangement, because the high-strength polyester yarn has the advantages of high tensile strength, small ductility, strong reinforcement ability, wear resistance, corrosion resistance, and light weight, it can effectively bind the wood, and through the winding process (referring to the conveying of the compression-molded slats (i.e., the wood core structure) through the winding main machine reciprocating winding operation, the high-strength polyester yarn is uniformly wound on the slats so that the slats are tightened together to form an organic whole), the shear resistance and overall stability of the wood core structure can be effectively enhanced. At the same time, the high-strength polyester yarn can withstand high temperatures above 300°C, which is convenient for the thermoplastic process. After the winding and binding is completed, the polypropylene resin composite material needs to be placed on the upper hopper of the hot press. The polypropylene resin composite material needs to be pumped into the hopper in advance for heating and dehumidification to prevent excessive moisture from affecting the effect of hot pressing of the polyethylene resin material on the high-strength polyester yarn.

[0030] According to one solution of the present invention, the third fixing structure includes at least two polymer composite layers stacked and wrapped around the periphery of the second fixing structure and the wood core structure. In this way, the third fixing structure formed in one piece can be wrapped around the periphery of the second fixing structure and the wood core structure, which effectively improves the density and integrity of the keel, increases the overall tensile and bending strength of the wood, and increases wear resistance and anti-aging effects, and improves ductility.

[0031] According to one solution of the present invention, the third fixed structure includes: a first polymer composite layer and a second polymer composite layer; the first polymer composite layer is wrapped around the wood core structure and the second fixed structure; the second polymer composite layer is wrapped around the first polymer composite layer. The third fixed structure also includes: a first connecting layer and a second connecting layer; the first connecting layer is arranged between the first polymer composite layer and the wood core structure and the first polymer composite layer and the second fixed structure, connecting the first polymer composite layer with the wood core structure and the second fixed structure; the second connecting layer is arranged between the first polymer composite layer and the second polymer composite layer, connecting the first polymer composite layer and the second polymer composite layer; the first connecting layer and the second connecting layer are made of polypropylene. In this way, the first polymer composite layer and the second polymer composite layer can be thermoplastic molded with the wood core structure by the method of wood-plastic integrated molding, and the wood core structure after molding is wrapped with two layers of polymer composite layers, so that the density and integrity are effectively improved, and the overall tensile and bending strength, wear resistance, and anti-aging effect of the keel are increased, and the ductility is improved.

[0032] According to one solution of the present invention, the first polymer composite layer and the second polymer composite layer are formed by pre-impregnation of high-strength fiber and polypropylene, and the tensile strength of the first polymer composite layer and the second polymer composite layer is greater than 800MPa, the fiber content is greater than 70%, and the thickness is 0.2mm. In this way, the polymer composite layer can form a tightly wrapped outer surface outside the laminated wood core structure, effectively avoiding corrosion of the wood core and the glue material.

[0033] According to one solution of the present invention, the composite regenerated keel of the present invention further includes: a rough surface, which is arranged on the outer wall of the third fixed structure. The surface of the third fixed structure adopts a cooling embossing process to form a rough surface, which ensures the surface beauty while avoiding the phenomenon of overheating and gluing caused by long-term embossing. Specifically, the cooling embossing process is realized by an embossing device and a cooling system, and the cooling is to avoid overheating and gluing caused by the embossing device working for a long time. After cooling embossing, a relatively rough surface is formed, which is convenient for construction and use, and improves the aesthetics of the product.

[0034] According to one solution of the present invention, a polypropylene plug can be provided on the wood core structure, that is, a conical grouting hole is provided on each layer of wood core, and each conical grouting hole is arranged concentrically, and the edges are aligned (tilted alignment). With such a configuration, when each layer of wood core is bonded to each other through the polypropylene plug composed of each grouting hole, the polypropylene between each layer of wood core can flow into the polypropylene plug by extrusion, so that each layer of wood core can be further bonded and fixed from the through hole formed in the middle of each layer of wood core, so that each layer of wood core can be effectively reinforced from between and inside each layer of wood core before tying the second fixing structure, so that the wood core structure forms an organic whole with high strength, ensuring the basic strength. In addition, if the polypropylene between each layer of wood core flows into the polypropylene plug and is not enough to bond each layer of wood core, an adhesive can be poured into the polypropylene plug by grouting, so as to block the polypropylene plug, so as to achieve a firm bonding and fixing of each layer of wood core from the inside, effectively improving the bonding strength.

[0035] According to one solution of the present invention, the cross-sectional shape of each conical grouting hole is rhombus-like, the aperture of the smaller hole in each conical grouting hole is 6mm, the aperture of the larger hole is 8mm, and the height of each conical grouting hole is 70mm; along the length direction of the wood core, corresponding conical grouting holes are set on each layer of wood core every 200mm. Such a setting can make the overall connection strength of the wood core structure higher and more uniform, the ability to resist external forces is stronger, the overall rigidity strength is large, and the problem of looseness caused by insufficient core strength during use is effectively avoided. Moreover, the design of the rhombus-like polypropylene bolt can make the speed of stacking adhesive materials such as polypropylene from bottom to top faster, and there will be no dead corners that the adhesive cannot reach in the lower part. The bonding area of ​​the adhesive and the wood core at the center of gravity (center) of the wood core structure is larger, and the bonding is more firm and reliable, which effectively improves the core strength of the wood core structure 1 as a whole, effectively improves the core strength of the keel, improves its ability to resist external forces, and solves various defects of the keel in the traditional solution.

[0036] According to the scheme of the present invention, the present invention can prevent the brittle bending fracture of the keel wood core, increase the structural ductility, and improve the shear and bending strength of the keel structure; at the same time, it can reduce the contact between wood and polypropylene resin materials and air, increase the durability of the keel structure, improve the material turnover rate, realize the resource recycling of waste materials, and be more low-carbon and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A cross-sectional view schematically showing a composite regenerated keel according to an embodiment of the present invention;

[0038] Figure 2 A schematic diagram showing a production flow chart of a composite regenerated keel according to the present invention;

[0039] Figure 3 This is a diagram showing the results of a four-point bending test of the present invention and traditional glued laminated wood. DETAILED DESCRIPTION

[0040] The content of the present invention will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are only to enable those skilled in the art to better understand and thus implement the content of the present invention, rather than implying any limitation on the scope of the present invention.

[0041] As used herein, the term “including” and variations thereof are to be interpreted as open-ended terms meaning “including, but not limited to.” The term “based on” is to be interpreted as “based, at least in part, on.” The terms “one embodiment” and “an embodiment” are to be interpreted as “at least one embodiment.”

[0042] Figure 1 Schematically showing a cross-sectional view of a composite regenerated keel according to an embodiment of the present invention. Figure 1As shown, in this embodiment, the composite regenerated keel includes:

[0043] The wood core structure 1 is composed of multiple layers of wood core 2 stacked together;

[0044] The first fixing structure 3 is arranged between the layers of wood core 2 to fix and connect the layers of wood core 2;

[0045] The second fixing structure 4 is wrapped and tied around the outer periphery of the wood core structure 1 to fix the wood core structure 1;

[0046] The third fixing structure 5 is arranged on the periphery of the second fixing structure 4 and the wood core structure 1, and is thermoplastically molded with the wood core structure 1. In this way, the first fixing structure 3 can be used to connect the layers of wood core 2 together to form a connection foundation for the layers of wood core stacked up and down, thereby ensuring the basic connection strength. Then, the second fixing structure 4 is used to wrap and bind the wood core structure 1 from the periphery (i.e., the outer wall in the length direction), so that the wood core structure 1 is further fixed from the outside on the basis of the first fixing structure 3 to form a high-strength whole. Further, the third fixing structure 5 is used to wrap the periphery of the second fixing structure 4 and the wood core structure 1 (i.e., the outer wall in the length direction of the wood core structure 1 and the outer wall of the second fixing structure 4 tied to the outer wall of the wood core structure 1), and the third fixing structure 5 and the wood core structure 1 are formed into a wood-plastic integrated integral rigid structure by thermoplastic molding, so that the structural strength and rigidity after being wrapped by the third fixing structure 5 are higher, the overall performance of the keel is effectively improved, and the problems of brittle damage and low utilization rate of traditional square wood keels are solved.

[0047] Furthermore, in this embodiment, the first fixing structure 3 is made of polypropylene. In this way, the first fixing structure 3 can be used to bond the wood cores 3 to form a whole by thermoplastic molding, thereby ensuring the basic connection strength and the connection tightness and stability of the stacked wood cores 3.

[0048] Furthermore, in this embodiment, the second fixing structure 4 is a high-strength polyester yarn, which is evenly wound and tied around the periphery of the wood core structure 1 at an angle of 60° and 3 cm intervals along the length direction of the wood core structure 1;

[0049] The high-strength polyester yarn is resistant to high temperatures of 300°C, and the outer side of the high-strength polyester yarn is hot-pressed with a polypropylene resin composite material at a heating temperature of 80°C by a hot press. In this way, because the high-strength polyester yarn has the advantages of high tensile strength, small ductility, strong reinforcement ability, wear resistance, corrosion resistance, and light weight, it can effectively bind the wood. Through the winding process (referring to the reciprocating winding operation of the conveying compression molding slats (i.e., the wood core structure) through the winding main machine, the high-strength polyester yarn is uniformly wound on the slats so that the slats are tightened together to form an organic whole), the shear resistance and overall stability of the wood core structure 1 can be effectively enhanced. At the same time, the high-strength polyester yarn can withstand high temperatures above 300°C, which is convenient for the thermoplastic process. In this embodiment, after the winding and binding is completed, the polypropylene resin composite material needs to be placed on the upper hopper of the hot press. The polypropylene resin composite material needs to be pumped to the hopper in advance for heating and dehumidification to prevent excessive moisture from affecting the effect of hot pressing of the polyethylene resin material on the high-strength polyester yarn. The heating temperature is 80°C.

[0050] Furthermore, if Figure 1 As shown, in this embodiment, the third fixing structure 5 includes at least two layers of polymer composite layers stacked and wrapped around the second fixing structure 4 and the wood core structure 1. In this way, the third fixing structure 5 formed in one piece can be wrapped around the second fixing structure 4 and the wood core structure 1, which effectively improves the density and integrity of the keel, increases the overall tensile and bending strength of the wood, and increases wear resistance and aging resistance, and improves ductility.

[0051] Furthermore, if Figure 1 As shown, in this embodiment, the third fixing structure 5 includes: a first polymer composite layer 6 and a second polymer composite layer 7;

[0052] The first polymer composite layer 6 is wrapped around the wood core structure 1 and the second fixing structure 3;

[0053] The second polymer composite layer 7 wraps around the first polymer composite layer 6 .

[0054] In this embodiment, the third fixing structure 5 further includes: a first connection layer 8 and a second connection layer 9;

[0055] The first connecting layer 8 is disposed between the first polymer composite layer 6 and the wood core structure 1 and between the first polymer composite layer 6 and the second fixing structure 4, connecting the first polymer composite layer 6 and the wood core structure 1 and the second fixing structure 4;

[0056] The second connecting layer 9 is disposed between the first polymer composite layer 6 and the second polymer composite layer 7 to connect the first polymer composite layer 6 and the second polymer composite layer 7;

[0057] The first connecting layer 8 and the second connecting layer 9 are made of polypropylene. In this way, the first polymer composite layer 6 and the second polymer composite layer 7 can be thermoplastic-formed with the wood core structure 1 by the method of wood-plastic integrated molding. The molded wood core structure 1 is wrapped with two layers of polymer composite layers, which effectively improves the density and integrity, increases the overall tensile and bending strength of the keel, and increases the wear resistance and aging resistance, and improves the ductility.

[0058] In this embodiment, the first polymer composite layer 6 and the second polymer composite layer 7 are formed by pre-impregnation of high-strength fiber and polypropylene, and the tensile strength of the first polymer composite layer 6 and the second polymer composite layer 7 is greater than 800 MPa, the fiber content is greater than 70%, and the thickness is 0.2 mm. In this way, the polymer composite layer can form a tightly wrapped outer surface on the outside of the laminated wood core structure 1, effectively avoiding corrosion of the wood core and the glue material.

[0059] Furthermore, in this embodiment, the tensile strength of the polypropylene is greater than 20 MPa, the elongation at break is greater than 30%, the bending strength is greater than 30 MPa, and the notched impact is greater than 150 J.

[0060] Furthermore, if Figure 1 As shown, in this embodiment, the composite regenerated keel of the present invention also includes: a rough surface 10, and the rough surface 10 is arranged on the outer wall of the third fixed structure 5. In this embodiment, the surface of the third fixed structure 5 adopts a cooling embossing process to form the rough surface 10, which ensures the surface beauty while avoiding the overheating and adhesive phenomenon caused by long-term embossing. Specifically, the cooling embossing process is realized by an embossing device and a cooling system, and the cooling is to avoid the overheating and adhesive caused by the long-term operation of the embossing device. After cooling embossing, a relatively rough rough surface 10 is formed, which is convenient for construction and use, and improves the aesthetics of the product.

[0061] Moreover, Figure 1As shown, in this embodiment, a polypropylene plug 12 can also be provided on the wood core structure 1, that is, a conical grouting hole 11 is provided on each layer of wood core 2, and each conical grouting hole 11 is arranged concentrically, and the edges are aligned (tilted alignment). In this way, when each layer of wood core 2 is bonded to each other through the polypropylene plug composed of each grouting hole 11, the polypropylene between each layer of wood core 2 can flow into the polypropylene plug 12 by extrusion, so that each layer of wood core 2 is further bonded and fixed from the through hole formed in the middle of each layer of wood core 2. In this way, each layer of wood core 2 can be effectively reinforced from between and inside each layer of wood core 2 before the second fixing structure 4 is tied, so that the wood core structure 1 forms an organic whole with high strength, ensuring the basic strength. Furthermore, if the polypropylene between the layers of wood core 2 flows into the polypropylene plug 12 but is not sufficient to bond the layers of wood core 2, adhesive can be poured into the polypropylene plug 12 by grouting, thereby sealing the polypropylene plug 12 and firmly bonding and fixing the layers of wood core 2 from the inside, thereby effectively improving the bonding strength.

[0062] Furthermore, if Figure 1 As shown, in this embodiment, the cross-sectional shape of each tapered grouting hole 11 is rhombus-like (i.e. Figure 1 The diameter of the smaller hole in each conical grouting hole 11 is 6 mm, the diameter of the larger hole is 8 mm, and the height of each conical grouting hole 11 is 70 mm;

[0063] Along the length direction of the wood core 2, corresponding conical grouting holes 11 are set on each layer of the wood core 2 every 200 mm. Such a setting can make the overall connection strength of the wood core structure 1 higher and more uniform, the ability to resist external forces is stronger, the overall rigidity strength is large, and the problem of looseness caused by insufficient core strength during use is effectively avoided. Moreover, the design of the rhombus-shaped polypropylene bolt 12 can make the stacking of adhesive materials such as polypropylene from bottom to top faster, and there will be no dead corners that the adhesive cannot reach in the lower part. The bonding area of ​​the adhesive and the wood core at the center of gravity (center) of the wood core structure 1 is larger, and the bonding is more firm and reliable, which effectively improves the overall core strength of the wood core structure 1, effectively improves the core strength of the keel, improves its ability to resist external forces, and solves various defects of the keel in the traditional solution.

[0064] In the present invention, after the polypropylene bolts 12 are formed on the wood core structure 1 and each layer of the wood core 2 is fixed by the polypropylene bolts 12, the second fixing structure and other structures are wrapped and tied, so that the strength of the keel core can be guaranteed to the greatest extent and the keel performance can be improved.

[0065] According to the above scheme of the present invention, in fact, the present invention cuts, extrude and glue the waste wood template, winds and binds the high-strength polyester yarn, and then forms the high-molecular composite layer and the polyethylene resin (PP material) through secondary thermoplastic molding, and finally forms the finished product by cooling and embossing the outer wall of the high-molecular composite layer and cutting it for use. The process is as follows: Figure 2 shown.

[0066] like Figure 3 As shown, the present invention and traditional unreinforced glued wood were used to conduct four-point bending tests, and the results showed that the present invention effectively improved the bending stiffness of the keel and changed the failure mode of traditional glued wood, changing the traditional brittle failure to ductile failure.

[0067] According to the above scheme of the present invention, the present invention can prevent the brittle bending fracture of the keel wood core, increase the structural ductility, and improve the shear and bending strength of the keel structure; at the same time, it can reduce the contact between the wood and polypropylene resin materials and the air, increase the durability of the keel structure, improve the material turnover rate, realize the resource recycling of waste materials, and be more low-carbon and environmentally friendly.

[0068] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A composite regenerated keel, characterized in that: include: A wood core structure (1) composed of multiple layers of wood core (2) stacked together; A first fixing structure (3) is arranged between the wooden cores (2) of each layer to fix and connect the wooden cores (2) of each layer; A second fixing structure (4) is wrapped around and tied to the periphery of the wood core structure (1) to fix the wood core structure (1); a third fixing structure (5), arranged on the periphery of the second fixing structure (4) and the wood core structure (1), and thermoplastically formed with the wood core structure (1); Conical grouting holes (11) are provided on each layer of the wood core (2), and each of the conical grouting holes (11) is arranged concentrically and has edges aligned; The cross-sectional shape of each of the conical grouting holes (11) is rhombus-like, the diameter of the smaller hole in each of the conical grouting holes (11) is 6 mm, the diameter of the larger hole is 8 mm, and the height of each of the conical grouting holes (11) is 70 mm; Along the length direction of the wood core (2), corresponding conical grouting holes (11) are arranged on each layer of the wood core (2) at intervals of 200 mm.

2. The composite regenerated keel according to claim 1, characterized in that: The first fixing structure (3) is made of polypropylene.

3. The composite regenerated keel according to claim 1, characterized in that: The second fixing structure (4) is a high-strength polyester yarn, and the high-strength polyester yarn is evenly wrapped and tied around the periphery of the wooden core structure (1) at an angle of 60° and at intervals of 3 cm along the length direction of the wooden core structure (1); The high-strength polyester yarn is resistant to high temperatures of 300° C., and the outer side of the high-strength polyester yarn is heat-pressed with a polypropylene resin composite material at a heating temperature of 80° C. by a heat press.

4. The composite regenerated keel according to claim 1, characterized in that: The third fixing structure (5) comprises at least two polymer composite layers which are stacked and wrapped around the periphery of the second fixing structure (4) and the wood core structure (1).

5. The composite regenerated keel according to claim 1, characterized in that: The third fixing structure (5) comprises: a first polymer composite layer (6) and a second polymer composite layer (7); The first polymer composite layer (6) is wrapped around the periphery of the wood core structure (1) and the second fixing structure (4); The second polymer composite layer (7) is wrapped around the periphery of the first polymer composite layer (6).

6. The composite regenerated keel according to claim 5, characterized in that: The third fixing structure (5) further comprises: a first connecting layer (8) and a second connecting layer (9); The first connecting layer (8) is arranged between the first polymer composite layer (6), the wood core structure (1) and the second fixing structure (4), and connects the first polymer composite layer (6), the wood core structure (1) and the second fixing structure (4); The second connecting layer (9) is arranged between the first polymer composite layer (6) and the second polymer composite layer (7) to connect the first polymer composite layer (6) and the second polymer composite layer (7); The first connecting layer (8) and the second connecting layer (9) are made of polypropylene.

7. The composite regenerated keel according to claim 5, characterized in that: The first polymer composite layer (6) and the second polymer composite layer (7) are formed by pre-impregnation of high-strength fibers and polypropylene, the polymer composite layer has a tensile strength of >800 MPa, a fiber content of >70%, and a thickness of 0.2 mm.

8. The composite regenerated keel according to claim 7, characterized in that: The tensile strength of the polypropylene is greater than 20 MPa, the elongation at break is greater than 30%, the bending strength is greater than 30 MPa, and the notched impact is greater than 150J.

9. The composite regenerated keel according to any one of claims 1, characterized in that: Also includes: A rough surface (10), wherein the rough surface (10) is arranged on an outer wall of the third fixing structure (5).

10. The composite regenerated keel according to claim 9, characterized in that: The rough surface (10) is formed by a cooling embossing process.

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