Inorganic composite bamboo component and manufacturing method thereof

Abstract

The application discloses an inorganic composite bamboo component and a manufacturing method thereof, relates to the technical field of composite bamboo wood, and solves the problem that existing inorganic glue composite bamboo components are prone to horizontal splitting around bolt holes, improves the horizontal splitting resistance of the component, and specifically has the following arrangement: an inner core is provided, a plurality of hoop-shaped constraint steel hoops are fixedly wound on the inner core, the constraint steel hoops are located on the two sides of bolt holes on the inner core, an outer core is fixedly wrapped on the outer wall of the inner core, and the constraint steel hoops are located between the inner core and the outer core.

Description

Technical Field

[0001] This invention relates to the field of composite bamboo and wood technology, and in particular to an inorganic composite bamboo component and its manufacturing method. Background Technology

[0002] Bamboo and wood are unique among all building materials in that they can grow naturally, conforming to sustainable development and being environmentally friendly green materials. Compared to wood, bamboo can be used as timber after four years of growth, and its strength is also higher than that of wood. It should also be emphasized that bamboo buildings, due to their light weight and high strength, have excellent earthquake resistance.

[0003] Traditional construction primarily uses steel bars, concrete, and clay bricks as materials. The preparation of these materials not only consumes large amounts of non-renewable resources such as sand, stone, and clay, but also consumes a significant amount of energy and emits carbon dioxide, which runs counter to the goal of green environmental protection and achieving "carbon neutrality," and is therefore unsustainable.

[0004] Existing inorganic adhesive composite bamboo (e.g., publications CN111393130B and CN111423820A) have proposed methods for preparing bamboo and wood using inorganic adhesives produced from components such as magnesium oxide, magnesium sulfate heptahydrate, silica fume, silica sol, lithium silicate, sodium silicate, citric acid, microcrystalline cellulose, nanocellulose whiskers, aminotrimethylene phosphonic acid, and water. Components made using this method have high strength and fire and corrosion resistance.

[0005] However, the aforementioned beams and slabs made of bamboo and wood are mostly connected by bolted joints. Due to stress concentration and other reasons, horizontal splitting of the bamboo and wood materials may occur around the bolt holes, which seriously affects the load-bearing performance of the components. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide an inorganic composite bamboo component and its manufacturing method. By using reinforcing steel hoops to circumferentially constrain the bolt holes around the inner core, and in conjunction with the combined constraining force of the outer core, the component's resistance to transverse splitting is greatly improved, solving the problem that existing inorganic adhesive composite bamboo components are prone to transverse splitting around bolt holes.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0008] In a first aspect, the present invention provides an inorganic composite bamboo component, comprising an inner core, a plurality of circumferentially arranged restraining steel hoops being wound and fixed on the inner core, the restraining steel hoops being located on both sides of bolt holes on the inner core, an outer core being wrapped and fixed on the outer wall of the inner core, and the restraining steel hoops being located between the inner core and the outer core.

[0009] As a further implementation, a groove is provided on the inner core at the position for installing the restraining steel hoop, the groove is arranged circumferentially along the inner core, and the restraining steel hoop is installed in the groove.

[0010] As a further implementation, both the inner core and the outer core are made of several bamboo bundles bonded together with an inorganic adhesive, and the inner core and the outer core are bonded together with an inorganic adhesive.

[0011] As a further implementation, both the outer core and the inner core are provided with a number of bolt holes, and the bolt holes on the outer core and the inner core correspond one-to-one.

[0012] As a further implementation, the outer core and the inner core have the same span.

[0013] Secondly, the present invention provides a method for manufacturing inorganic composite bamboo components, as detailed below:

[0014] Prepare bamboo bundles and spray the bamboo bundles with an inorganic adhesive;

[0015] Bamboo bundles with inorganic adhesive are stacked in the first mold, the first mold is sealed and vibrated, pressurized and cured to prepare the inner core;

[0016] Grooves are made on both sides of the location where bolt holes need to be set on the prepared inner core, and restraining steel hoops are installed in the grooves;

[0017] A layer of bamboo bundles containing adhesive is laid in the second mold, and the inner core with the surface coated with inorganic adhesive is placed in the second mold. Then, a layer of bamboo bundles containing adhesive is laid on the sides and top of the inner core, the second mold is sealed, and then vibrated, pressurized, and cured.

[0018] Remove the mold and drill bolt holes in the prepared components.

[0019] As a further implementation, the bamboo bundle is made by splitting and processing raw bamboo into bamboo strips, then carbonizing and drying them.

[0020] As a further implementation, the spans of the first mold and the second mold are the same as the span of the final molded component, and the thickness and width of the second mold are greater than those of the first mold.

[0021] As a further implementation, the distance between the two sides of the inner core and the sidewall of the adjacent second mold is the same.

[0022] As a further implementation, the bolt holes are located between two adjacent reinforcing steel hoops.

[0023] The beneficial effects of the present invention are as follows:

[0024] (1) The present invention uses the confining steel hoop to circumferentially constrain the inner core bolt hole, and works with the outer core to circumferentially constrain it, which greatly improves the component's resistance to horizontal splitting and ensures the load transfer of the component connection node; at the same time, the outer core can prevent the confining steel hoop from being exposed to the air, avoid the confining steel hoop from rusting, and the outer core's shielding of the confining steel hoop can ensure the overall aesthetics of the inorganic adhesive composite bamboo component.

[0025] (2) The inorganic composite bamboo component of the present invention is formed by secondary extrusion, and the outer core is wrapped around the inner core as a protective layer, which facilitates the installation of the groove and the restraining steel hoop, and ensures the aesthetics and resistance to horizontal splitting of the final formed component.

[0026] (3) The present invention adopts the production sequence of first preparing the components and then opening the bolt holes. Before opening the bolt holes, the inner core is circumferentially constrained by the constrained steel hoop and the outer core, which avoids the inner core from splitting due to stress during the bolt hole opening process, and effectively ensures the production quality of inorganic adhesive composite bamboo components. Attached Figure Description

[0027] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0028] Figure 1 This is a schematic diagram of the overall structure of an inorganic composite bamboo component according to one or more embodiments of the present invention;

[0029] Figure 2 This is a structural schematic diagram of an inorganic adhesive composite bamboo and wood component without bolt holes according to one or more embodiments of the present invention;

[0030] Figure 3 This is a schematic diagram of the inner core according to one or more embodiments of the present invention;

[0031] Figure 4 This is a schematic diagram of the inner core with a groove according to one or more embodiments of the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the inner core with a restraining steel reinforcement hoop installed according to one or more embodiments of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of a mold for preparing bamboo and wood components according to one or more embodiments of the present invention;

[0034] Figure 7 This is a schematic diagram of the inner core of the present invention used in conjunction with a second mold according to one or more embodiments;

[0035] In the diagram: the spacing or dimensions between parts have been exaggerated to show their positions; the diagram is for illustrative purposes only.

[0036] Among them, 1. Side plate; 2. Stiffening rib; 3. Base plate; 4. Inner core; 5. Groove; 6. Restricting steel hoop; 7. Outer core; 8. Bolt hole. Detailed Implementation

[0037] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0038] As described in the background section, existing components such as beams and slabs made of bamboo and wood are mostly connected by bolt joints. Due to stress concentration and other reasons, horizontal splitting of bamboo and wood materials may occur around the bolt holes, which seriously affects the load-bearing performance of the components. In order to solve the above technical problems, this invention proposes an inorganic composite bamboo component and its manufacturing method.

[0039] Example 1

[0040] In a typical embodiment of the present invention, such as Figures 1-5 As shown, an inorganic composite bamboo component is proposed, including an inner core 4, an outer core 7, and a restraining steel hoop 6 disposed on the inner core 4.

[0041] The outer core 7 covers the inner core 4, and the inner core 4 and the outer core 7 are bonded together with inorganic adhesive. Several circumferentially arranged restraining steel hoops 6 are installed on the outer wall of the inner core 4, and the restraining steel hoops 6 are located on both sides of each row of bolt hole areas.

[0042] For ease of explanation, this embodiment uses a long strip-shaped inner core 4 with two rows of bolt holes 8 at each end as an example, as detailed below:

[0043] The inner core 4 is made of several bamboo bundles bonded together with inorganic glue. Two rows of bolt holes 8 are opened at both ends of the inner core 4. Each row of bolt holes 8 contains at least one bolt hole 8. A restraining steel hoop 6 is installed on both sides of each row of bolt holes 8. That is, three restraining steel hoop 6 are set at both ends of the inner core 4 (one restraining steel hoop 6 is shared on the side of the two rows of bolt holes that are adjacent), so as to use the restraining steel hoop 6 to circumferentially restrain the bolt hole 8 area of ​​the inner core 4.

[0044] A groove 5 is provided on the inner core 4 at the position for installing the restraining steel hoop 6. The groove 5 is arranged circumferentially along the inner core 4. The restraining steel hoop 6 is installed in the groove 5, thereby using the groove 5 to restrict the position of the restraining steel hoop 6, while ensuring that the surface of the restraining steel hoop 6 is flush with the surface of the inner core 4, so as to ensure the flatness when the outer core 7 is assembled, and thus ensure the overall aesthetics of the component.

[0045] The outer core 7 is made of the same material as the inner core 4, and is also made of several bamboo bundles bonded together with inorganic glue. The inner core 4 and the outer core 7 are bonded together with inorganic glue. On the one hand, the outer core 7 can prevent the restraining steel hoop 6 from being exposed to the air and avoid the restraining steel hoop 6 from rusting. On the other hand, the outer core 7 can cover the groove 5 and the restraining steel hoop 6 to ensure the overall aesthetics of the inorganic glue composite bamboo component. In addition, the outer core 7 can also work with the restraining steel hoop 6 to circumferentially restrain the inner core 4 to improve the ability of the inorganic glue composite bamboo component to prevent horizontal splitting and ensure the smooth transfer of load at the component connection node.

[0046] The span of the outer core 7 is the same as that of the inner core 4. The outer core 7 also has several bolt holes 8. The number and position of the bolt holes 8 on the outer core 7 correspond one-to-one with the bolt holes 8 on the inner core 4. The bolt holes 8 pass through the inner core 4 and the outer core 7 for bolt installation and use.

[0047] It should be noted that in this embodiment, the inner core 4 is a long strip structure. In other embodiments, the inner core 4 can also be a T-shaped, L-shaped or other structural shape. The specific shape can be determined according to the actual design requirements.

[0048] It is understandable that the location of bolt holes 8 is not limited to the two ends of the inner core 4. The specific location and number of bolt holes need to be determined according to the actual shape of the component and the location of the connection node. No further restrictions are imposed here.

[0049] It is understandable that, in practical applications, the circumferential constraint method at the bolt holes of the components in this embodiment can also be used in inorganic composite bamboo and wood components and inorganic composite wood components.

[0050] Example 2

[0051] In a typical embodiment of the present invention, a method for manufacturing inorganic composite bamboo components is provided, as follows:

[0052] First, the raw bamboo is pre-treated to obtain bamboo bundles. The bamboo bundles are then transported to the location where inorganic adhesive is sprayed. The inorganic adhesive is then sprayed onto the bamboo bundles, and the bamboo bundles and inorganic adhesive are fully fused together using a glue spraying machine.

[0053] Bamboo bundles with inorganic adhesive are conveyed to the position of the first mold, and the bamboo bundles are stacked in the first mold according to the size of the first mold.

[0054] After the bamboo bundles in the first mold are stacked, the first mold is sealed and then vibrated and pressurized.

[0055] The first mold, along with the bamboo bundles inside, is sent into the curing room for curing. After curing, the first mold is removed to obtain the inner core 4 of the composite bamboo structure. The inner core 4 is sent into the curing room for curing again. After curing, it is taken out and stored.

[0056] The pretreatment of raw bamboo includes splitting, thinning, carbonization and drying. Raw bamboo is split and thinned into bamboo strips, and then carbonized and dried to obtain bamboo bundles that can be compounded with inorganic adhesives.

[0057] The first mold has an opening at the top and is made of steel plate. It contains a side plate 1, a bottom plate 3, and several stiffening ribs 2 fixedly installed on the side plate 1. The stiffening ribs 2 are arranged vertically to bear the horizontal load generated during pressurization.

[0058] The span of the first mold is the same as the span of the final molded component, and its thickness and width are smaller than the cross-sectional dimensions of the final molded component.

[0059] On the inner core 4, grooves 5 are opened on both sides of the position where bolt holes 8 need to be set, so that the width and depth of the grooves 5 match the restraining steel hoop 6.

[0060] Using steel bars with a diameter of 8mm to 10mm, a ring-shaped restraint steel hoop 6 is made to match the outer contour shape of the inner core 4. The restraint steel hoop 6 is made by lap splicing and welding the steel bars, and the lap length is greater than the lap length of arc welding.

[0061] Specifically, the reinforcing bars are placed in the groove 5 so that they surround the inner core 4. The ends of the reinforcing bars in the groove 5 are lapped and welded and fixed by arc welding to form a restraining reinforcing bar hoop 6.

[0062] It should be noted that a steel bar is installed in each groove 5, and a steel bar is used to prepare a restraining steel hoop 6.

[0063] A layer of bamboo bundles containing glue is laid on the bottom surface of the second mold, and an inorganic adhesive is applied to the surface of the inner core 4. The inner core 4 coated with inorganic adhesive is placed in the second mold so that the distance between the two sides of the inner core 4 and the side wall of the adjacent second mold is the same.

[0064] A layer of adhesive-containing bamboo bundles is laid on the sides and top surface of the inner core 4 inside the second mold to seal the second mold and to vibrate and pressurize it.

[0065] The second mold, along with its internal components, is sent into the curing room for curing. After curing, the second mold is removed to obtain the inorganic adhesive composite bamboo component, which is then sent into the curing room for curing again.

[0066] Bolt holes 8 are made at predetermined positions on the prepared component, such that the bolt holes 8 are located between two adjacent reinforcing steel hoops 6.

[0067] The second mold has the same structural shape as the first mold, consisting of a side plate 1, stiffening ribs 2, and a base plate 3. The span of the second mold is the same as that of the first mold. The thickness and width of the second mold are greater than those of the first mold. Specifically, the width and thickness of the second mold are the same as the cross-sectional dimensions of the final molded component.

[0068] The outer core 7 is wrapped around the inner core 4 as a protective layer to prevent the confining steel hoop 6 from corroding while ensuring the overall aesthetics of the component. At the same time, the outer core 7 can work with the confining steel hoop 6 to circumferentially constrain the inner core 4, avoiding the problem of horizontal splitting of the inner core 4 due to stress concentration after the bolt is inserted (the inner core 4 is the main load-bearing part of the component).

[0069] This embodiment adopts a manufacturing sequence of first preparing the components and then opening the bolt holes 8. Before opening the bolt holes 8, the inner core 4 is circumferentially constrained by the restraining steel hoop 6 and the outer core 7, which avoids the inner core 4 from splitting due to stress during the opening of the bolt holes 8, and effectively ensures the production quality of the inorganic adhesive composite bamboo components.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An inorganic composite bamboo component, characterized in that, The device includes an inner core with several circumferentially arranged reinforcing steel hoops wound and fixed on it. These reinforcing steel hoops are located on both sides of bolt holes on the inner core. An outer core is wrapped and fixed to the outer wall of the inner core, with the reinforcing steel hoops positioned between the inner and outer cores. Both the inner and outer cores are made of several bamboo bundles bonded together with an inorganic adhesive. A groove is provided on the inner core at the location for installing the reinforcing steel hoops, with the groove running circumferentially along the inner core. The reinforcing steel hoops are installed within the groove. The groove restricts the position of the reinforcing steel hoops, and the surface of the reinforcing steel hoops is flush with the surface of the inner core to ensure flatness when the outer core is assembled. Both the outer and inner cores have several bolt holes, with each bolt hole corresponding to the one on the inner core. The outer core, together with the reinforcing steel hoops, provides circumferential constraint to the inner core.

2. The inorganic composite bamboo component according to claim 1, characterized in that, The outer core and the inner core have the same span.

3. A method for manufacturing an inorganic composite bamboo component as described in any one of claims 1-2, characterized in that, Specifically as follows: Prepare bamboo bundles and spray the bamboo bundles with an inorganic adhesive; Bamboo bundles with inorganic adhesive are stacked in the first mold, the first mold is sealed and vibrated, pressurized and cured to prepare the inner core; Grooves are made on both sides of the location where bolt holes need to be set on the prepared inner core, and restraining steel hoops are installed in the grooves; A layer of bamboo bundles containing adhesive is laid in the second mold, and the inner core with the surface coated with inorganic adhesive is placed in the second mold. Then, a layer of bamboo bundles containing adhesive is laid on the sides and top of the inner core, the second mold is sealed, and then vibrated, pressurized, and cured. Remove the mold and drill bolt holes in the prepared components.

4. The method for manufacturing inorganic composite bamboo components according to claim 3, characterized in that, The bamboo bundles are made by splitting and processing raw bamboo into bamboo strips, then carbonizing and drying them.

5. The method for manufacturing inorganic composite bamboo components according to claim 3, characterized in that, The spans of the first mold and the second mold are the same as the span of the final molded component, and the thickness and width of the second mold are greater than those of the first mold.

6. The method for manufacturing inorganic composite bamboo components according to claim 3, characterized in that, The distance between the two sides of the inner core and the sidewall of the adjacent second mold is the same.

7. The method for manufacturing inorganic composite bamboo components according to claim 3, characterized in that, The bolt holes are located between two adjacent reinforcing steel hoops.

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