Wood structure-pouring soil composite wall and construction method thereof

Abstract

The invention provides a wood structure-pouring soil composite wall and a construction method thereof, and belongs to the technical field of wood structures and pouring soil, and the construction method comprises the steps of S1, systematic design of a pouring soil formula, S2, construction of a wood structure-pouring soil frame composite building system and S3, construction of pouring soil. On the material level, the high-performance pouring soil formula design method based on soil characteristic system optimization is established, and collaborative optimization of material workability, mechanical strength and durability is achieved by determining key components and parameter ranges of the key components; on the structural level, an integrated composite system of the wood framework and the poured soil wall body is established, cooperative stress of the wood framework and the poured soil wall body is achieved through a specific structural layer, and the problems of wood-soil interface bonding and thermal bridge are effectively solved; on the construction level, a special construction technology matched with the method is developed, quality control standards of key procedures such as formwork erecting, layered pouring and maintenance are included, and the feasibility and engineering reliability of the technical scheme are ensured.

Description

Technical Field

[0001] This invention relates to the fields of timber structure and cast-in-place soil technology, and in particular to a timber-cast-in-place composite wall and its construction method. Background Technology

[0002] While both timber and rammed earth are environmentally friendly materials, their integration in modern engineering faces a systemic technological gap. At the materials level, existing research on cast-in-place rammed earth is largely confined to the laboratory, focusing on isolated optimization of single properties and failing to develop a universal, stable, and engineerable formulation system. This results in significant fluctuations in workability, mechanical strength, and durability due to regional soil variations when materials move from the laboratory to the construction site, lacking reliable quality control benchmarks and severely hindering their engineering applications. At the structural system level, existing technologies have failed to provide an effective integration solution for cast-in-place rammed earth and modern timber structures. In traditional timber-framed infill walls, there is a lack of effective collaborative working mechanisms and rigid connections between the timber frame and the rammed earth filler, leading to poor overall integrity. Modern timber-framed wall systems completely abandon the use of soil-based materials, relying instead on industrially synthesized materials. This not only loses the ecological value of soil materials (such as thermal inertia and humidity regulation), but also suffers from inherent defects such as insufficient low-frequency sound insulation and higher fire risk due to timber exposure. At the construction technology level, the engineering application of high-performance cast-in-place soil is almost non-existent, and the corresponding on-site construction techniques and curing methods are almost entirely lacking. This creates a "conversion bottleneck" from materials to buildings. Even with materials of acceptable performance, large-scale and standardized construction cannot be achieved due to the lack of reliable and efficient construction methods.

[0003] Existing solutions can be categorized into two types: The first type is the traditional timber-framed infill wall system. A typical approach involves filling units formed by load-bearing timber beams and columns with a simple mixture of local soil, straw, sand, and gravel (such as rammed earth or straw mud) using wooden planks or bamboo strips as templates to create an enclosure structure. While this system utilizes natural and renewable materials, it suffers from significant drawbacks: material proportions rely on experience and lack scientific design, resulting in poor mechanical strength, durability, and water resistance, making it prone to erosion and cracking; the timber frame and the infill soil are primarily in physical contact, lacking effective structural connections and collaborative mechanisms, leading to poor overall integrity; its thermal performance depends solely on the thermal inertia of the thick, rammed earth wall, resulting in limited insulation performance and low construction efficiency, making it difficult to meet the requirements of modern building energy conservation and industrialized construction. The second type is the modern timber-framed composite wall system, the technical details of which are specified in the "Technical Standard for Timber-Framed Composite Walls" GB / T 50361-2018. The system uses standard-sized timber to form a load-bearing frame, fills the cavities of the keel with insulation materials such as rock wool and glass wool, and covers the sides of the keel with panel materials such as OSB board and gypsum board. While this system achieves standardization and rapid construction of wood structures and can meet certain thermal specifications through the combination of insulation materials, its technical approach has inherent limitations: First, regarding fire safety, although standards stipulate the fire resistance performance of the cladding materials, wood itself is a combustible material, and its overall fire resistance limit is usually lower than that of walls made of non-combustible materials such as concrete, posing an inherent challenge to fire safety; second, regarding moisture resistance and durability, wood is prone to decay and insect infestation in humid environments, requiring extremely high standards for moisture-proof construction, wood preservation treatment, and construction sealing quality, as defects will seriously affect the durability and service life of the wall; furthermore, in terms of acoustic performance, the surface density of this lightweight wall system is limited, often resulting in poor isolation of low-frequency noise (such as footsteps and equipment vibrations); finally, from an ecological perspective, the system mainly relies on industrially synthesized insulation materials such as rock wool and extruded polystyrene (XPS), which also presents a disadvantage in terms of carbon emissions. Summary of the Invention

[0004] The purpose of this invention is to provide a timber-cast-soil composite wall and its construction method. Through systematic design of material formulations, integrated structural construction, and standardized control of construction processes, a complete "materials-structure-construction" technical system is built. At the material level, a high-performance cast-in-place soil formulation design method based on systematic optimization of soil properties is established. By determining key components and their parameter ranges, the workability, mechanical strength, and durability of the materials are synergistically optimized. At the structural level, an integrated composite system of timber frame and cast-in-place wall is created. Through specific structural layers, the two components work together to bear loads, effectively solving the problems of timber-soil interface bonding and thermal bridging. At the construction level, a matching specialized construction process is developed, including quality control standards for key procedures such as formwork, layered pouring, and curing, ensuring the feasibility and reliability of the technical solution.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A method for constructing a timber-cast-mortar composite wall includes the following steps: Step S1. Systematic design of the concrete formulation: Step S11. Conduct systematic testing on the soil at the project site, including particle size distribution, liquid limit, plastic limit, and free swelling rate. Select original soil that meets the following criteria: clay content greater than or equal to 5%, liquid limit in the range of 32-46, plasticity index in the range of 16-28, and free swelling rate less than 50%. Then, conduct systematic formulation design of high-performance castable soil.

[0006] Step S12. Optimize particle size distribution: Optimize the particle size distribution of the soil using sand and gravel aggregates of different sizes, and use the Andreasen cumulative volume fraction equation to quantify the mix formulation.

[0007] Step S13. Add hexametaphosphate to improve the mortar fluidity.

[0008] Step S14. Add cement to enhance compressive strength and accelerate slurry flocculation.

[0009] Step S15. Add flax fibers to enhance compressive strength and inhibit cracking.

[0010] Step S16. Through the above design process, a stable formula suitable for soils in different regions is obtained.

[0011] Step S2. Construction of the composite building system of timber structure-cast soil frame: Two prefabricated standard timber keel frames are used as the core load-bearing skeleton of the building and also as the supporting frame for the cast soil layer. The two timber keel frames are connected together by connectors. OSB boards are installed on the timber keel frame near the outside, which provide basic structural support. A waterproof and breathable membrane is laid on the inside of the timber keel frame without OSB boards and on the outside of the OSB boards. A first layer of bamboo mesh is embedded in both timber keel frames, and a second layer of bamboo mesh is set on the outside of both timber keel frames. The cavity formed by the two timber keel frames is filled with straw insulation layer and compacted.

[0012] Step S3. Construction process for poured soil: Step S31. Material pretreatment: Use a sieve to remove gravel larger than 20 mm from the excavated soil. Put the sieved soil into a container, add water and dispersant in a fixed ratio, and soak for 2-3 hours. Use a hand mixer to fully disperse the soil to form a uniform slurry. Use a cutting machine to cut the flax fibers to a fixed length.

[0013] Step S32. Erecting the formwork: Erect wooden formwork or concrete metal formwork on the wooden frame.

[0014] Step S33. Material mixing: Put all materials into the concrete drum mixer and mix them evenly. After all materials have been added, mix thoroughly for about 10 minutes to form a uniform concrete mixture.

[0015] Step S34. Pouring and Vibration: The soil slurry is poured manually or by pump into the cavity between the wooden formwork and the inner OSB board. After pouring, a concrete vibrator is used to fully vibrate the slurry to remove air bubbles and increase density. After vibration, a scraper is used to smooth the top surface of the soil.

[0016] Step S35. Formwork Removal: Remove the formwork 24 hours after pouring, and then set up the formwork again to pour the next layer.

[0017] Step S36. Curing: Cover the surface of the freshly demolded soil layer with a transparent plastic film to slow down the evaporation of moisture from the surface of the soil. Remove the film after 7 days and wait for the soil layer to dry naturally. Take care to avoid rain.

[0018] Step S37. Surface treatment: After the wall has dried naturally for 28 days, repair the wall surface and apply a hardener to protect the poured soil layer.

[0019] Furthermore, in step S12, after optimizing the particle size distribution, the distribution modulus of the soil is between 0.2 and 0.5, and is as close as possible to 0.37, with additional sand and gravel aggregate accounting for 60%-70% of the total mass.

[0020] Furthermore, in step S13, based on the mass of fine particles with a particle size of less than 63 μm, 0.2%-0.4% sodium hexametaphosphate is added as a dispersant to optimize the slurry spread to the range of 19-23 cm.

[0021] Furthermore, in step S14, based on the total mass of soil and aggregate, 5%-10% of ordinary Portland cement is added to achieve a compressive strength of 1-3 MPa after 28 days.

[0022] Furthermore, in step S15, based on the quality of the soil, flax fiber with a length of 40-60 mm and a dosage of 0.2%-0.4% is finally incorporated.

[0023] Furthermore, in step S2, the thickness of the straw insulation layer is 200mm, and the straw insulation layer is treated by adding 5% lime by weight of the straw before filling.

[0024] Further, in step S31, the flax fibers are cut into 50mm lengths.

[0025] Furthermore, in step S32, the height of the template is controlled between 600mm and 1200mm.

[0026] Furthermore, in step S33, the order in which the materials are added is as follows: pre-dispersed and uniformly mixed mud, sand and gravel aggregate, flax fiber, and cement.

[0027] A wood-cast-soil composite wall includes two wood frame frames, OSB (Oriented Straw Board), connectors, a waterproof and breathable membrane, a first layer of bamboo mesh, a second layer of bamboo mesh, a straw insulation layer, and a layer of cast-in-place soil. The two wood frame frames are arranged in parallel and connected by connectors. OSB is installed on the wood frame frame closer to the outside. A waterproof and breathable membrane is laid on the inner side of the wood frame frame without OSB and on the outer side of the OSB. The first layer of bamboo mesh is embedded in both wood frame frames, and a second layer of bamboo mesh is installed on the outer side of both wood frame frames. The cavity formed by the two wood frame frames is filled with a straw insulation layer, and a layer of cast-in-place soil is poured on the outer side of the second layer of bamboo mesh.

[0028] Advantages of this invention: 1. This invention provides a high-performance castable soil material formulation system that can be widely adapted to different regional soil conditions and is established through a systematic method, ensuring the stability and reliability of material performance in engineering applications.

[0029] 2. This invention creates a novel structural system that integrates a wooden frame and high-performance cast-in-place soil. Through a unique structural design, the two work together, which not only improves the overall structural performance but also fundamentally improves the fire resistance, sound insulation, and thermal performance of the wall.

[0030] 3. This invention develops a set of specialized construction techniques and whole-process quality control methods that match the composite system, including mixed pouring, joint treatment and scientific maintenance measures, filling the process gap from materials to application, and ensuring the feasibility of the technical solution and the reliability of the project.

[0031] 4. The present invention aims to build a complete technology chain from reusable material formulations to integrated composite structures and specialized complete construction processes, and to overcome the core challenge of moving cast-in-place technology from laboratory research to engineering application. Attached Figure Description

[0032] Figure 1 This is a structural schematic diagram of the wood-cast-earth composite wall in this invention; Figure 2 This is an exploded view of the wood-cast-earth composite wall structure in this invention; Figure 3 This is a detailed drawing of the wood-cast-earth composite wall in this invention; In the diagram: 1. Wooden keel frame, 2. OSB board, 3. Connectors, 4. Waterproof and breathable membrane, 5. First layer of bamboo mesh, 6. Second layer of bamboo mesh, 7. Straw insulation layer, 8. Pouring soil layer. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0034] like Figures 1-3 As shown, a method for constructing a timber-cast-mortar composite wall includes the following steps: Step S1. Systematic design of the concrete formulation: Step S11. Conduct systematic testing on the soil at the project site, including particle size distribution, liquid limit, plastic limit, and free swelling rate. Select original soil that meets the following criteria: clay content greater than or equal to 5%, liquid limit in the range of 32-46, plasticity index in the range of 16-28, and free swelling rate less than 50%. Then, conduct systematic formulation design of high-performance castable soil.

[0035] Step S12. Optimize particle size distribution: Optimize the particle size distribution of the soil using sand and gravel aggregates of different sizes, and use the Andreasen cumulative volume fraction equation to quantify the mix formulation.

[0036] Andreasen's cumulative volume fraction equation is:

[0037] In the formula: CPFT(D) is the volume percentage of particles with a diameter less than or equal to D, where D is the diameter of the particles, Dmax is the maximum diameter of the particles in the mixture, and q is the distribution modulus.

[0038] Step S13. Add hexametaphosphate to improve the mortar fluidity.

[0039] Step S14. Add cement to enhance compressive strength and accelerate slurry flocculation.

[0040] Step S15. Add flax fibers to enhance compressive strength and inhibit cracking.

[0041] Step S16. Through the above design process, a stable formula suitable for soils in different regions is obtained.

[0042] Step S2. Construction of the composite building system of timber structure-cast soil frame: Two prefabricated standard timber keel frames 1 are used as the core load-bearing skeleton of the building and also as the supporting frame of the cast soil layer 8. All timber keel frames 1 are precisely processed in the factory according to the design drawings and transported to the site for rapid assembly through connectors 3. Connectors 3 are wooden connectors to enhance the stability of the structure.

[0043] Two wooden joist frames 1 are connected together by connectors 3. OSB board 2 is installed on the wooden joist frame 1 near the outside. OSB board 2 provides basic structural support. A waterproof and breathable membrane 4 is laid on the inside of the wooden joist frame 1 without OSB board 2 and on the outside of OSB board 2. The waterproof and breathable membrane 4 can prevent the water of the poured soil slurry from seeping into OSB board 2 and straw insulation layer 7.

[0044] The first layer of bamboo mesh 5 is embedded in both wooden keel frames 1. The first layer of bamboo mesh 5 is used to tie the poured soil and OSB board, and improve the bonding force between the two interfaces.

[0045] A second layer of bamboo mesh 6 is installed on the outside of both wooden frame frames 1 as a crack-resistant component for the poured soil. The bamboo mesh is made of bamboo strips 20-30mm wide and arranged in parallel at 150mm intervals in both longitudinal and transverse directions.

[0046] The cavity formed by the two wooden keel frames 1 is filled with straw insulation layer 7 and compacted.

[0047] Step S3. Construction process for poured soil: Step S31. Material pretreatment: Use a sieve to remove gravel larger than 20 mm from the excavated soil. Place the sieved soil into a container, add water and dispersant in a fixed ratio, and soak for 2-3 hours. Use a hand mixer to fully disperse the soil to form a uniform slurry. Use a cutting machine to cut the flax fibers to a fixed length of 50 mm.

[0048] Step S32. Erecting the formwork: Erect wooden formwork or concrete metal formwork on the wooden frame 1.

[0049] Step S33. Material mixing: Put all materials into the concrete drum mixer and mix them evenly. After all materials have been added, mix thoroughly for about 10 minutes to form a uniform concrete mixture.

[0050] Step S34. Pouring and Vibration: The soil slurry is poured manually or by pump into the cavity between the wooden formwork and the inner OSB board 2. After pouring, a concrete vibrator is used to fully vibrate the slurry to remove air bubbles and increase density. After vibration, a scraper is used to smooth the top surface of the soil.

[0051] Step S35. Formwork Removal: Remove the formwork 24 hours after pouring, and then set up the formwork again to pour the next layer.

[0052] Step S36. Curing: Cover the surface of the freshly demolded soil layer 8 with a transparent plastic film to slow down the evaporation of moisture from the surface of the soil. Remove the film after 7 days and wait for the soil layer 8 to dry naturally. Take care to avoid rain.

[0053] Step S37. Surface treatment: After the wall has dried naturally for 28 days, repair the wall surface and apply a hardener to protect the poured soil layer 8 and improve its durability.

[0054] In a preferred embodiment of the present invention, in step S12, the distribution modulus of the soil after optimizing the particle size distribution is between 0.2 and 0.5, and is as close as possible to 0.37, and the additional sand and gravel aggregate accounts for 60%-70% of the total mass.

[0055] In a preferred embodiment of the present invention, in step S13, based on the mass of fine particles with a particle size of less than 63 μm, 0.2%-0.4% sodium hexametaphosphate is added as a dispersant to optimize the slurry spread to the range of 19-23 cm, ensuring that the material has suitable workability.

[0056] In a preferred embodiment of the present invention, in step S14, 5%-10% of ordinary Portland cement is then added based on the total mass of soil and aggregate, so that the compressive strength after 28 days reaches 1-3 MPa, which meets the basic self-supporting requirements.

[0057] In a preferred embodiment of the present invention, in step S15, based on the quality of the soil, flax fibers with a length of 40-60 mm and a dosage of 0.2%-0.4% are finally added to effectively inhibit material shrinkage cracks and improve compressive strength.

[0058] As a preferred embodiment of the present invention, in step S16, through the above design process, the typical optimized ratio of the formula is: 0.3% sodium hexametaphosphate, 6% cement, and 0.3% 50mm long flax fiber.

[0059] In a preferred embodiment of the present invention, in step S2, the thickness of the straw insulation layer 7 is 200 mm; in order to inhibit mold growth and improve stability, the straw insulation layer 7 is treated with lime accounting for 5% of the straw mass before filling.

[0060] In a preferred embodiment of the present invention, in step S31, the flax fibers are cut into 50mm lengths.

[0061] In a preferred embodiment of the present invention, in step S32, the height of the template is controlled between 600mm and 1200mm.

[0062] In a preferred embodiment of the present invention, in step S33, the materials are added in the following order: pre-dispersed and uniformly mixed mud, sand and gravel aggregate, flax fiber, and cement.

[0063] In a preferred embodiment of the present invention, the thickness of the poured soil layer 8 is 160 mm.

[0064] A wood-cast-soil composite wall includes two wood frame frames 1, OSB board 2, connectors 3, a waterproof and breathable membrane 4, a first layer of bamboo mesh 5, a second layer of bamboo mesh 6, a straw insulation layer 7, and a cast-in-place soil layer 8. The two wood frame frames 1 are arranged in parallel and connected by connectors 3. OSB board 2 is installed on the wood frame frame 1 near the outside. A waterproof and breathable membrane 4 is laid on the inner side of the wood frame frame 1 without OSB board 2 and on the outer side of OSB board 2. The first layer of bamboo mesh 5 is embedded in both wood frame frames 1, and the second layer of bamboo mesh 6 is provided on the outer side of both wood frame frames 1. The cavity formed by the two wood frame frames 1 is filled with the straw insulation layer 7, and the cast-in-place soil layer 8 is poured on the outer side of the second layer of bamboo mesh 6.

[0065] The key innovation of this patent lies in the construction of a complete and engineerable "timber-cast-mortar" building technology system. Its core protection focuses on the following three closely related levels: At the material formulation level, the key point is the establishment of a high-performance castable soil formulation design system based on soil property system optimization. Specifically, it protects the dispersant dosage design method based on the soil fine particle quality (particle size less than 63μm), especially the sodium hexametaphosphate dosage range of 0.2%-0.4%, and the synergistic ratio system of cementitious materials and fiber reinforcing materials, including the parameter range of cement dosage of 5%-10% and flax fiber length of 40-60mm with dosage of 0.2%-0.4%. At the same time, it protects the typical optimized formulations obtained by the above methods, such as the ratio containing 0.3% sodium hexametaphosphate, 6% cement and 0.3% flax fiber.

[0066] At the structural level, the key point is the integrated composite structure of the timber frame load-bearing structure and the cast-in-place earthen wall. The protection focuses on the specific structural layers and sequence from the timber frame, OSB board, waterproof and breathable membrane, bamboo mesh to the cast-in-place earthen wall, as well as the specific application of double-layer bamboo mesh as a crack-resistant reinforcement layer. The bamboo mesh is made of bamboo strips 20-30mm wide and arranged at 150mm intervals. It also includes the continuous enclosure system and its structure formed by completely wrapping the timber frame with cast-in-place earthen wall.

[0067] At the construction technology level, the key innovation lies in the special construction technology for this system. The protection points include strict control of the pouring height of each layer in the layered pouring process (600mm-1200mm), a special curing method of immediately covering with plastic film and keeping moist for no less than 7 days after demolding, and the whole process quality control standards from soil pretreatment, material mixing sequence to vibration compaction and surface treatment.

[0068] Ultimately, the most valuable aspect of this patent lies in the systematic integration of the aforementioned material formulation, structural design, and construction process, forming a complete technology chain from material design to construction completion, and building a multi-level, all-round patent protection network.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can still adjust the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Therefore, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A method for constructing a timber-cast-mortar composite wall, characterized in that, Includes the following steps: Step S1. Systematic design of the concrete formulation: Step S11. Conduct systematic testing on the soil at the project site, including particle size distribution, liquid limit, plastic limit, and free swelling rate. Select original soil that meets the following criteria: clay content greater than or equal to 5%, liquid limit in the range of 32-46, plasticity index in the range of 16-28, and free swelling rate less than 50%. Then, conduct systematic formulation design of high-performance castable soil. Step S12. Optimize particle size distribution: Optimize the particle size distribution of the soil using sand and gravel aggregates of different sizes, and use the Andreasen cumulative volume fraction equation to quantitatively formulate the mixture; Step S13. Add hexametaphosphate to improve mortar fluidity; Step S14. Add cement to enhance compressive strength and accelerate slurry flocculation; Step S15. Add flax fibers to enhance compressive strength and inhibit cracking; Step S16. Through the above design process, a stable formula suitable for soils in different regions is obtained; Step S2. Construction of a composite building system of timber structure-cast soil frame: Two prefabricated standard timber frame (1) are used as the core load-bearing skeleton of the building and also as the supporting frame of the cast soil layer (8). The two timber frame (1) are connected together by connectors (3). OSB board (2) is installed on the timber frame (1) near the outside. The OSB board (2) provides basic structural support. A waterproof and breathable membrane (4) is laid on the inside of the timber frame (1) without OSB board (2) and on the outside of OSB board (2). A first layer of bamboo mesh (5) is embedded in both timber frame (1). A second layer of bamboo mesh (6) is set on the outside of both timber frame (1). The cavity formed by the two timber frame (1) is filled with straw insulation layer (7) and compacted. Step S3. Construction process for poured soil: Step S31. Material pretreatment: Use a sieve to remove gravel larger than 20 mm from the excavated soil. Put the sieved soil into a container, add water and dispersant in a fixed ratio, and soak for 2-3 hours. Use a hand mixer to fully disperse the soil to form a uniform slurry. Use a cutting machine to cut the flax fibers to a fixed length. Step S32. Erecting the formwork: Erect wooden formwork or concrete metal formwork on the wooden frame (1); Step S33. Material mixing: Put all the materials into the concrete drum mixer and mix them evenly. After all the materials have been added, mix them thoroughly for about 10 minutes to form a uniform concrete slurry. Step S34. Pouring and Vibration: The soil slurry is poured manually or by pump into the cavity between the wooden template and the inner OSB board (2). After pouring, it is necessary to use a concrete vibrator to fully vibrate the slurry to remove air bubbles and improve the density. After vibration, the top surface of the soil material is smoothed with a scraper. Step S35. Formwork Removal: Remove the formwork 24 hours after pouring, and then set up the formwork again to pour the next layer; Step S36. Curing: Cover the surface of the freshly demolded soil layer (8) with a transparent plastic film to delay the evaporation of moisture from the surface of the soil. Remove the film after 7 days and wait for the soil layer (8) to dry naturally. Take care to avoid rain. Step S37. Surface treatment: After the wall has dried naturally for 28 days, repair the wall surface and apply a curing agent to protect the poured soil layer (8).

2. The construction method of a wood-cast-earth composite wall according to claim 1, characterized in that: In step S12, after optimizing the particle size distribution, the distribution modulus of the soil is between 0.2 and 0.5, and is as close as possible to 0.

37. The additional sand and gravel aggregate accounts for 60%-70% of the total mass.

3. The construction method of a wood-cast-earth composite wall according to claim 2, characterized in that: In step S13, based on the mass of fine particles with a particle size of less than 63 μm, 0.2%-0.4% sodium hexametaphosphate is added as a dispersant to optimize the slurry spread to the range of 19-23 cm.

4. The construction method of a wood-cast-earth composite wall according to claim 3, characterized in that: In step S14, 5%-10% of ordinary Portland cement is then added based on the total mass of soil and aggregate, so that the compressive strength reaches 1-3 MPa after 28 days.

5. The construction method of a timber-cast-mortar composite wall according to claim 4, characterized in that: In step S15, based on the quality of the soil, flax fiber with a length of 40-60 mm and a dosage of 0.2%-0.4% is finally added.

6. The construction method of a timber-cast-mortar composite wall according to claim 5, characterized in that: In step S2, the thickness of the straw insulation layer (7) is 200 mm, and the straw insulation layer (7) is treated by adding 5% lime by weight of straw before filling.

7. A method for constructing a timber-cast-mortar composite wall according to claim 6, characterized in that: In step S31, the flax fibers are cut into 50mm lengths.

8. A method for constructing a timber-cast-mortar composite wall according to claim 7, characterized in that: In step S32, the height of the template is controlled between 600mm and 1200mm.

9. A method for constructing a timber-cast-mortar composite wall according to claim 8, characterized in that: In step S33, the materials are added in the following order: pre-dispersed and uniformly mixed mud, sand and gravel aggregate, flax fiber, and cement.

10. A wood-cast-earth composite wall, characterized in that: The system includes two wooden frame frames (1), OSB board (2), connectors (3), waterproof and breathable membrane (4), first layer of bamboo mesh (5), second layer of bamboo mesh (6), straw insulation layer (7), and poured soil layer (8). The two wooden frame frames (1) are arranged in parallel and connected by connectors (3). OSB board (2) is installed on the wooden frame frame (1) closer to the outside. A waterproof and breathable membrane (4) is laid on the inner side of the wooden frame frame (1) without OSB board (2) and on the outer side of OSB board (2). The first layer of bamboo mesh (5) is embedded in both wooden frame frames (1). The second layer of bamboo mesh (6) is set on the outer side of both wooden frame frames (1). The cavity formed by the two wooden frame frames (1) is filled with straw insulation layer (7). The second layer of bamboo mesh (6) is poured on the outer side of the second layer of bamboo mesh (6).

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