Novel assembled integral wood-concrete composite board, design theory and construction method

Abstract

The invention discloses a novel wood-concrete composite board suitable for a large-span building / roof board. The novel wood-concrete composite board comprises a wood bottom board (1), a wood rib board (2), reinforcing steel bars (3) and concrete (4). According to the shape and stress requirements of the combined plate, the wood rib plate (2) can be arranged in a one-way or two-way mode and is fixed to the wood bottom plate (1) through self-tapping screws. Holes (5) are formed in the wood rib plates (2) at equal intervals, steel bars (3) are inserted into the holes, concrete (4) is poured, and the prefabricated slab is formed after maintenance. An equivalent model is established according to the structural form and stress characteristics of the composition board, and the design theory of bending and shearing of the board is provided. A two-stage construction method of prefabrication of the novel wood-concrete composite board in a factory and on-site secondary pouring is established. According to the novel wood-concrete composite board, the tensile property of wood / steel and the compressive property of concrete are fully exerted, the bearing capacity of the board is improved, the using amount of steel bars is reduced, and the novel wood-concrete composite board has the advantages of being environmentally friendly, reasonable in stress, high in prefabrication level, convenient to construct and the like.

Description

Technical Field

[0001] This invention relates to the field of concrete structures, specifically to a wood-concrete composite panel for use in large-span building / roof structures, including its design theory and installation method. Background Technology

[0002] With the acceleration of urbanization and the rapid rise of China's manufacturing industry, an increasing number of public and industrial buildings require large-span structural designs to meet their functional requirements, posing challenges to the design of horizontally loaded components. Precast floor / roof structures, manufactured in factories, help ensure product quality while avoiding the problems of large workloads and safety hazards associated with integral pouring of floor / roof panels. This is significant for improving structural safety, achieving low-carbon energy conservation, and reducing project costs. Compared to precast assembled floor / roof panels, assembled monolithic concrete structures, in addition to possessing traditional advantages such as high industrialization and fast construction speed, significantly improve the overall integrity and seismic performance of the structure.

[0003] The following three aspects need to be considered when designing prefabricated floor / roof panels: 1) They often contain two or more materials. The synergistic performance between these materials greatly affects the mechanical properties of the panels. Existing prefabricated floor / roof panels often achieve synergistic stress distribution through the bonding effect of cement, etc. However, after deformation under stress, the interfaces of different materials are prone to detachment, leading to safety hazards in terms of component stress and durability; 2) The reliability of the installation and connection of prefabricated panels. Existing prefabricated floor / roof panels often use rebar joints to connect with the surrounding beams or wall structures. This results in indirect force transmission at the joints, posing a challenge to the reliability of the connection; 3) The synergistic stress distribution of multiple materials and the complexity of the structure lead to a lack of design theory. Prefabricated floor / roof panels have different load-bearing capacities and stress characteristics during construction and use. After the prefabricated panels are installed, they need to serve as formwork for concrete pouring and bear various construction loads at the same time, requiring the development of corresponding design theories. Summary of the Invention

[0004] Technical Problem: Addressing the requirements for coordinated stress distribution and reliable connection of multiple materials in precast floor / roof panels, and the need for stress performance analysis of panels at each stage in prefabricated construction methods, this invention aims to propose a novel prefabricated monolithic wood-concrete composite panel that is environmentally friendly, structurally sound, reliably connected, and applicable to large-span floor / roof panels. Compared to existing composite floor slabs, this invention fully considers the collaborative performance between concrete, reinforcing steel, and wood panels. In addition to bonding different materials using cement adhesive, it achieves coordinated stress distribution by inserting reinforcing steel bars through holes in the wood ribs and pouring concrete. The wood ribs and small concrete columns within the holes are arranged in a crisscross pattern, enhancing the overall structural integrity and ensuring that material properties are fully utilized to meet the stress requirements of large-span floor / roof structures. All reinforcing steel bars extend outwards as pre-reserved joints, allowing for reliable anchorage directly to beams / walls during installation, effectively preventing load transfer from deflecting at supports. Considering the tensile strength of the wooden baseboard and reinforcing steel, the compressive strength of the concrete, and the shear strength of the wooden ribs, a mechanical performance analysis model for wood-concrete composite panels is established, and calculation formulas for the bending and shear bearing capacity of the panels are proposed. Furthermore, this invention presents a two-stage construction method for prefabricated monolithic wood-concrete composite panels. Factory prefabrication facilitates product quality control, while on-site secondary pouring ensures structural integrity. This is a novel composite floor / roof panel form with good construction performance and high engineering practicality.

[0005] Technical Solution: This invention proposes a novel wood-concrete composite panel for large-span building / roof panels, along with its design theory and construction method. Through structural design, this new panel achieves coordinated stress distribution among the wood components, reinforcing steel, and concrete. An equivalent analysis theory is proposed for structural parameter design, and combined with factory prefabrication and on-site secondary casting methods, green and efficient construction of large-span building / roof panels is realized.

[0006] The novel wood-concrete composite panel design considers the synergistic performance of the various materials constituting the panel, preventing the interfaces between different materials from separating after deformation under stress, thus ensuring the full utilization of material properties and affecting the structural load-bearing capacity. Aiming to improve the synergistic performance between concrete and wood, perforated wood ribs are incorporated, with reinforcing bars inserted into the holes. After concrete pouring, the wood panels are bonded to the concrete through adhesives, and the concrete columns within the holes intersect with the wood ribs to achieve mechanical connection, enhancing the overall integrity of both. Parameters such as the spacing of the wood ribs, the specifications and spacing of the reinforcing bars, and the diameter of the holes significantly influence the mechanical properties of the composite panel. A theoretical analysis model and calculation formulas for the composite panel are established to achieve a rational design of the panel structure.

[0007] The method for calculating the bending capacity of the wood-concrete composite panel considers the contributions of reinforced concrete and wood to the bending resistance of the panel, and the calculation formula is as follows:

[0008] M u =M rcu +γMwu (1)

[0009] In the formula, M rcu The flexural resistance provided by reinforced concrete, M wu The bending resistance provided to the wooden board, where γ is the cooperating factor.

[0010]

[0011] In the formula, f y f c and f w The material strengths of steel bars, concrete, and wood are respectively, ψ s For parameters related to the cross-sectional specifications of reinforcing bars, t b b is the thickness of the wooden baseboard. hole b is the spacing between the holes in the wooden ribs. hole ζ is the distance from the center of the hole to the top edge of the plate, h is the plate thickness, and ζ is the plate module.

[0012] The method for calculating the shear capacity of the wood-concrete composite slab is to take the sum of the shear capacity of the concrete and the shear capacity of the wood ribs, that is:

[0013] V u =V cu +V wu (4)

[0014] Considering the role of the wooden ribs in enhancing the shear capacity of the composite panel, the high load and large crack width experienced by the wooden ribs during shear failure weaken the shear contribution of the concrete. Therefore, the shear capacity of the concrete is expressed as:

[0015] V cu =η c V c (5)

[0016] In the formula V c To determine the shear capacity of the panel without considering the contribution of the timber ribs, η c The reduction factor is calculated using the following formula:

[0017]

[0018] ρ s f is the longitudinal reinforcement ratio. c f is the compressive strength of concrete. y ε is the yield strength of the tensile reinforcement, a is the horizontal projection length of the shear crack, b is the slab width, h is the slab thickness, and ε is the tensile strength of the steel reinforcement. u ε0 and ε0 represent the strain values ​​at the height with and without the wooden ribs participating in the stress, respectively, and d g This is a physical quantity that reflects the mechanical interlocking of concrete on both sides of a crack.

[0019] The shear capacity of a timber ribbed plate can be expressed as:

[0020]

[0021] In the formula φ u E represents the curvature of the wood cross section. w I represents the elastic modulus of wood. w h is the bending moment of inertia of the wood section. hole h is the distance from the center of the hole to the top edge of the plate. c t is the distance from the point of application of the resultant force in the concrete shear-compression zone to the upper edge of the plate. b This refers to the thickness of the wooden baseboard.

[0022] In the aforementioned wood-concrete composite panel, the stress distribution of each material is clearly defined. Structural parameters such as the thickness of the wood base, the number and specifications of the reinforcing bars, and the height of the wood ribs affect the bending performance of the panel. Parameters such as the thickness and spacing of the wood ribs affect the shear performance of the panel. The number, spacing, and diameter of the holes affect the stress synergy between the concrete and the wood. At the same time, the hole spacing and diameter must match the number and specifications of the reinforcing bars. Therefore, the mechanical performance design of the wood-concrete composite panel needs to take into account multiple structural parameters and their coupling relationships. Equation (10) is used to establish the relationship equation between each structural parameter and the panel performance, and the influence mechanism of the parameters on the panel performance is analyzed.

[0023] Y = f(w·Xb) (10)

[0024] In the formula, Y is the plate performance matrix, X is the construction parameter matrix, and w and b are the weight matrix and bias matrix, respectively.

[0025] The two-stage construction method described above aims to achieve factory prefabrication of components, ensuring product quality while improving the overall structural integrity. The first stage involves determining the structural parameters of the panels based on their span, constraints, and load-bearing requirements, fabricating the required specifications of wooden baseboards and ribs, and splicing them using self-tapping screws. Reinforcing bars are inserted into the holes of the wooden ribs and fixed in the center of the holes. Concrete is then poured and cured. The second stage involves roughening the concrete surface of the panels, reliably anchoring the pre-reserved joints to the beam reinforcement or wall after hoisting them into place, and then pouring a second layer of concrete to enhance the overall structural integrity.

[0026] Beneficial effects: Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1) This invention uses wood to replace steel, adapting to the current market requirements for low-carbon, environmentally friendly, and energy-saving construction. In addition to participating in load-bearing, the wood floorboards can be directly used as the building roof, realizing the integrated design of architectural decoration and structural load-bearing.

[0028] 2) This invention enhances the synergistic stress-bearing performance between multiple materials through structural design. In addition to bonding at the interface between the concrete and the wooden board, the concrete columns inside the holes of the wooden ribs intersect with the ribs, ensuring reliable transmission of internal forces between the two materials and facilitating the full utilization of material properties.

[0029] 3) This invention proposes theoretical calculation formulas for the bending and shear bearing capacity of wood-concrete composite panels that consider the synergistic stress of multiple materials, and trains the relationship equations between the structural parameters of the composite panel and its mechanical properties, laying the foundation for guiding the cross-sectional design and bearing capacity verification of this new type of panel.

[0030] 4) This invention employs a two-stage construction technique for the wood-concrete composite panel to ensure structural integrity. In the first stage, wooden baseboards and ribs are fabricated, reinforcing bars are inserted and fixed, and concrete is poured to the same height as the ribs. The composite panel production is then completed in the factory. In the second stage, after the precast panels are installed on-site, the pre-reserved joints are reliably anchored to the surrounding beam reinforcement or walls, and a second round of concrete pouring ensures structural integrity. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the novel wood-concrete composite panel of the present invention;

[0032] Figure 2 This is a schematic diagram of the computational equivalent model of the novel wood-concrete composite board of the present invention;

[0033] Figure 3 This is a schematic diagram of the combined plate structure according to Embodiment 1 of the present invention;

[0034] Figure 4 This is a schematic diagram of the installation of the wooden rib plate according to Embodiment 1 of the present invention;

[0035] Figure 5 This is a schematic diagram of the assembly of the wooden base plate and the wooden rib plate according to Embodiment 1 of the present invention;

[0036] Figure 6 This is a schematic diagram of the steel bar installation according to Embodiment 1 of the present invention;

[0037] Figure 7 This is a schematic diagram of the casting of the composite plate according to Embodiment 1 of the present invention;

[0038] Figure 8 This is a schematic diagram of the combined plate structure according to Embodiment 2 of the present invention;

[0039] Figure 9 This is a schematic diagram of the assembly of the wooden base plate and the wooden rib plate in Embodiment 2 of the present invention;

[0040] Figure 10 This is a schematic diagram of the steel bar installation in Embodiment 2 of the present invention;

[0041] Figure 11This is a schematic diagram of the casting of the composite plate according to Embodiment 2 of the present invention;

[0042] In the diagram: 1. Wooden baseboard, 2. Wooden ribs, 3. Reinforcing bars, 4. Concrete, 5. Holes, 6. Reserved joints, 7. Binding wires, 8. Longitudinal reinforcement, 9. Web reinforcement, 10. Clips, 11. Spacers, 12. Side formwork. Detailed Implementation

[0043] To make the content of this invention clearer and easier to understand, the embodiments of this invention will be described in detail below with reference to the accompanying drawings and specific examples.

[0044] The present invention describes a novel wood-concrete composite panel for use in floor / roof panels. Its structure mainly comprises a wood base board (1), wood ribs (2), reinforcing steel bars (3), and concrete (4), etc., and the composite panel structure is as follows: Figure 1 As shown.

[0045] The wooden baseboard (1) serves as the bottom formwork for the composite board casting. When the board is bent, it shares the tensile force with the reinforcing steel bars (3), which can reduce the amount of steel bars used. After the board is installed in place, the wooden baseboard (1) can be used as a decorative panel for the room ceiling after being polished, painted and waxed.

[0046] The arrangement of the wooden ribs (2) is related to the shape of the board. When the ratio of the dimensions of the two directions of the composite board is greater than 3, it can be arranged in one direction; otherwise, it should be arranged in two directions. When arranged in two directions, slots (10) are opened on the ribs according to their spacing. The longitudinal and transverse ribs are spliced ​​at the slots to form a mesh and fixed to the wooden base plate (1).

[0047] Holes (5) are made in the wooden ribs (2). The holes (5) should be evenly arranged and reinforced steel bars (3) are placed in the middle. The diameter and spacing of the holes (5) are related to the number and specifications of the reinforced steel bars (3). Only one reinforced steel bar (3) should be placed in a single hole (5), and the diameter of the hole (5) should not be less than 3 times the diameter of the steel bar (3).

[0048] Concrete (4) is poured in the factory to the same height as the wooden ribs (2), thoroughly vibrated and compacted, and properly cured. The holes (5) in the ribs are filled with concrete columns, so that the concrete (4) and the wooden ribs (2) are mechanically interlocked, which, together with the bonding effect of the cement colloid, ensures that the various materials work together to bear the load.

[0049] Reinforcing bar joints are reserved around the plate (6). In order to achieve reliable anchorage between the plate and the surrounding beams or walls, the anchorage length should not be less than 12 times the diameter of the reinforcing bar. If the beam width / wall thickness cannot meet the anchorage length requirements, hooks should be made at the ends of the reinforcing bars. At the same time, the horizontal anchorage length should not be less than 6 times the diameter of the reinforcing bar.

[0050] Considering the main stress characteristics of each structure in the wood-concrete composite slab, the wood base slab (1) and the reinforcing steel bars (3) are the main tension members, the wood ribs (2) can assist the concrete (4) in resisting shear, and the upper concrete (4) can withstand compressive stress. An equivalent model of the composite slab is established as follows: Figure 2 As shown, the wooden base plate (1) and the reinforcing steel bars (3) can be equivalent to the longitudinal reinforcing bars (8), and the wooden rib plate (2) can be equivalent to the shear reinforcement bars (9). Calculation formulas for the bending and shear bearing capacity of the composite plate are proposed. Considering the coupling effect of various structural parameters on the stress performance of the plate, a functional equation between geometric dimensions and plate performance is established to achieve efficient plate design.

[0051] The wood-concrete composite panel proposed in this invention is generally constructed and installed in two stages. In the first stage, the wooden base board (1) and wooden rib board (2) are made, the reinforcing bars (3) are inserted and fixed, and concrete (4) is poured to the same height as the wooden rib board (2). The precast panel production is completed in the factory after curing. In the second stage, after the precast panel is installed in place on site, the reserved joints (6) are reliably anchored to the surrounding beam reinforcing bars or walls. The concrete surface of the composite panel is roughened and a second pour is made to ensure the integrity of the structure.

[0052] Through the above-mentioned structural measures, design theories and construction methods, the novel wood-concrete composite board proposed in this invention achieves green environmental protection and reasonable stress distribution, while meeting the structural integrity requirements of buildings. It is a new type of composite component suitable for floor / roof panels of civil and industrial buildings.

[0053] Example 1

[0054] Figures 3 to 7 This is a schematic diagram of Embodiment 1 of the present invention. The ratio of the length to the short side of the board is 1.5. The wooden ribs (2) are arranged in a two-way pattern, such as... Figure 3 As shown, the sheet metal mainly relies on four functional parts to bear the force:

[0055] 1) is a wooden baseboard (1), located at the bottom of the board. During the prefabrication stage, it serves as a construction platform and can be used to fix the wooden ribs (2) and also as the bottom formwork when pouring concrete. When the board is bent, it relies on the excellent tensile properties of wood and the steel bars (3) to bear the tension. After the board is installed in place, the protective film of the wooden baseboard (1) is removed, and after polishing, painting and waxing, it is used as a decorative panel for the ceiling of the room.

[0056] 2) The wooden ribs (2) are arranged alternately along the longitudinal and transverse directions. Holes (5) are set on the ribs. During the prefabrication stage, reinforcing steel bars (3) are inserted into the holes. The wooden ribs (2) can effectively improve the rigidity of the wooden base plate (1) and prevent the wooden base plate (1) from undergoing excessive deflection during the concrete pouring process. After the plate is formed, the concrete columns in the holes (5) are cross-connected with the ribs. The mechanical interlocking can ensure that the internal force is reliably transmitted between the wood and the concrete, and improve the synergistic stress performance of the combined plate. After the plate is installed in place, the wooden ribs (2) and the concrete (4) resist shear together.

[0057] 3) is the reinforcing steel (3), which is arranged in the middle of the rib hole (5). When the composite plate is bent, it and the wooden base plate (1) jointly bear the bottom tension of the plate. Due to the presence of the wooden base plate (1), the amount of reinforcing steel (3) can be reduced.

[0058] 4) is concrete (4), which can withstand the compressive stress generated by the bending moment in the plate, and at the same time, together with the wooden rib plate (2), it can withstand the shear force. The thickness of concrete (4) largely determines the stiffness of the composite plate.

[0059] Figure 4 The diagram shows the assembly of the longitudinal and transverse wooden ribs (2) in Example 1. The spacing of the wooden ribs (2), the number and specifications of the reinforcing bars (3) are determined according to the stress requirements of the boards. Holes (5) and slots (10) are made on the ribs. The longitudinal and transverse wooden ribs (2) are assembled at the slots (10) and bonded with structural adhesive.

[0060] Figure 5 The diagram shows the assembly of the wooden rib (2) and the wooden base plate (1). It is advisable to connect them with self-tapping screws. If structural adhesive is used, measures should be taken to ensure the reliability of the connection, such as slotting or setting triangular blocks on the wooden base plate (1).

[0061] Figure 6 The diagram shows the assembly of the reinforcing bars (3). The precast platform has pads (11) on both sides to ensure that the reinforcing bars inserted into the holes (5) are located in the center of the holes. The reinforcing bars (3) are arranged in both longitudinal and transverse directions and are fixed at the intersections by binding wires (7).

[0062] Figure 7 The diagram shows the concrete pouring process. Concrete (4) is poured into the frame consisting of a wooden base plate (1), wooden ribs (2), and side formwork (12) until it reaches the same height as the wooden ribs (2). After curing for 7 days, the side formwork (12) is removed.

[0063] Example 1 employs a two-stage construction method: the first stage is... Figures 4-7 The wood-concrete composite panel shown is prefabricated in the factory; the second stage is on-site installation. After the reserved joint (6) is reliably anchored to the surrounding beams / walls, the composite panel is used as the bottom formwork of the floor / roof panel and is poured together with the surrounding beams and columns to the design elevation to ensure the integrity of the structure.

[0064] Example 2

[0065] Figures 8 to 11 This is a schematic diagram of Embodiment 2 of the present invention. The ratio of the length to the short side of the board is 3, and the wooden ribs (2) are arranged in a unidirectional manner, such as... Figure 8 As shown, the sheet metal mainly relies on four functional parts to bear the force:

[0066] 1) is a wooden baseboard (1), located at the bottom of the board. During the prefabrication stage, it serves as a construction platform and can be used to fix the wooden ribs (2) and also as the bottom formwork when pouring concrete. When the board is bent, it relies on the excellent tensile properties of wood and the steel bars (3) to bear the tension. After the board is installed in place, the protective film of the wooden baseboard (1) is removed, and after polishing, painting and waxing, it is used as a decorative panel for the ceiling of the room.

[0067] 2) is a wooden rib (2), which is arranged along the long side of the board. Holes (5) are set on the rib. During the prefabrication stage, reinforcing steel bars (3) are inserted into the holes. The wooden rib (2) can effectively improve the rigidity of the wooden base plate (1) and prevent the wooden base plate (1) from undergoing excessive deflection during the concrete pouring process. After the board is formed, the concrete columns in the holes (5) are cross-connected with the rib. The mechanical interlocking can ensure that the internal force is reliably transmitted between the wood and the concrete, and improve the synergistic stress performance of the combined board. After the board is installed in place, the wooden rib (2) can resist shear together with the concrete (4).

[0068] 3) is the reinforcing steel (3), which is arranged in the middle of the rib hole (5). When the composite plate is bent, it and the wooden base plate (1) jointly bear the bottom tension of the plate. Due to the presence of the wooden base plate (1), the amount of reinforcing steel (3) can be reduced.

[0069] 4) is concrete (4), which can withstand the compressive stress generated by the bending moment in the plate, and at the same time, together with the wooden rib plate (2), it can withstand the shear force. The thickness of concrete (4) largely determines the stiffness of the composite plate.

[0070] Figure 9 The diagram shows the assembly of the wooden rib (2) and the wooden base plate (1). It is advisable to connect them with self-tapping screws. If structural adhesive is used, measures should be taken to ensure the reliability of the connection, such as slotting or setting triangular blocks on the wooden base plate (1).

[0071] Figure 10 The diagram shows the assembly of the reinforcing bars (3). The precast platform has pads (11) on both sides to ensure that the reinforcing bars inserted into the holes (5) are located in the center of the holes. The reinforcing bars (3) are arranged along the short side of the plate.

[0072] Figure 11The diagram shows the concrete pouring process. Concrete (4) is poured into the frame consisting of a wooden base plate (1), wooden ribs (2), and side formwork (12) until it reaches the same height as the wooden ribs (2). After curing for 7 days, the side formwork (12) is removed.

[0073] Example 2 employs a two-stage construction method: the first stage is... Figures 9-11 The wood-concrete composite panel shown is prefabricated in the factory; the second stage is on-site installation. After the reserved joint (6) is reliably anchored to the surrounding beams / walls, the composite panel is used as the bottom formwork of the floor / roof panel and is poured together with the surrounding beams and columns to the design elevation to ensure the integrity of the structure.

[0074] The embodiments described in this invention are merely preferred embodiments and are not intended to limit the scope of the invention. It should be noted that all equivalent changes and modifications made within the scope of the claims of this invention should be considered within the technical scope and protection of this invention.

Claims

1. A novel wood-concrete composite panel suitable for large-span floor / roof panels and its design theory, characterized in that: The wooden base plate (1) is reliably connected to the perforated wooden rib plate (2), and steel bars (3) are inserted into the holes (5) of the rib plate. Concrete (4) is then poured to form a precast slab. After surface treatment, the concrete is hoisted and the reserved joint (6) is reliably lapped with the beam reinforcement before secondary pouring. Considering the mechanical connection between the reinforced concrete column in the hole (5) and the wooden rib plate (2), a theoretical analysis model and bearing capacity calculation formula for the composite slab are established.

2. The wooden baseboard (1) and wooden ribboard (2) according to claim 1, characterized in that: For wood panels, plywood, particleboard, chipboard, and OSB are recommended, while fiberboard, blockboard, and finger-jointed boards should be avoided.

3. The reliable connection between the wooden base plate (1) and the wooden rib plate (2) according to claim 1, characterized in that: According to the force transmission path and size requirements of the floor / roof panel, the wooden rib (2) can be arranged unidirectionally or bidirectionally along the wooden base plate (1). It is advisable to connect it with self-tapping screws. If structural adhesive is used, the connection reliability should be ensured. If necessary, triangular blocks should be set on both sides of the wooden rib.

4. The rib hole (5) according to claim 1, characterized in that: The size and spacing of the holes (5) are determined according to the span of the composite plate, reinforcement requirements, etc. The holes (5) should be arranged at equal intervals, and a single steel bar (3) should be inserted into each hole. The diameter of the hole (5) should not be less than 3 times the diameter of the steel bar (3).

5. The concrete (4) surface treatment according to claim 1, with the reserved joint (6) lapped with the beam reinforcement, is characterized in that: First, remove impurities such as laitance and oil stains from the surface of the concrete (4), and then roughen it with mechanical chiseling or sandblasting. The length of the reserved joint (6) extending into the beam should not be less than 12 times the diameter of the reinforcing bar (3). If this cannot be met, a hook should be set at the end of the reserved joint (6).

6. The wooden baseboard (1) according to claim 1, characterized in that: In addition to forming a precast panel load-bearing system with the wooden ribs (2), steel bars (3) and concrete (4), the wooden baseboard (1) can be used as a decorative panel for the ceiling of a room after it has been polished, painted and waxed after the components are installed in place.

7. The arrangement of the wooden ribs (2) according to claim 3, characterized in that: When the ratio of the dimensions of the wood-concrete composite board in two directions is greater than 3, it can be arranged in one direction; otherwise, it should be arranged in two directions. The wood ribs should be arranged at equal intervals, and slots (7) should be set between the holes (5). Rib mesh is formed by splicing at the slots (7).

8. According to claim 4, the stress characteristics of the novel wood-concrete composite board under bending moment and shear force are as follows: the wood base plate (1) and the steel bar (3) are located at the lower part of the board and are under tension, the concrete (4) is located at the upper part and is under compression, the wood rib plate (2) can play a shear resistance role, and at the same time it is connected with the concrete and steel bar in the hole (5), which effectively ensures the synergistic working performance between wood and concrete.

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