Prefabricated laminated slab assembling structure and construction method thereof

Abstract

The application discloses an assembled laminated slab splicing structure and a construction method thereof. The assembled laminated slab splicing structure comprises a top layer prefabricated flat plate and a bottom layer prefabricated flat plate. The bottom layer prefabricated flat plate and the top layer prefabricated flat plate are connected and fixed in the vertical and horizontal directions through a mortise and tenon connecting mechanism. After the bottom layer prefabricated flat plate and the top layer prefabricated flat plate are connected and fixed through the mortise and tenon connecting mechanism, the two cannot move relative to each other in the vertical and horizontal directions, and a concrete pouring cavity is formed between the connected and fixed bottom layer prefabricated flat plate and top layer prefabricated flat plate. A concrete layer is poured in the concrete pouring cavity, wherein the concrete layer is formed by pouring concrete after the bottom layer prefabricated flat plate and the top layer prefabricated flat plate are connected and fixed through the mortise and tenon connecting mechanism. The application realizes rapid and accurate splicing of the laminated slab, improves the connection strength, integrity and anti-seismic performance of the laminated slab, and reduces the field wet work.

Description

Technical Field

[0001] This invention relates to the technical field of prefabricated building construction, and in particular to a prefabricated composite slab assembly structure and its construction method. Background Technology

[0002] Prefabricated construction, as an important development direction of building industrialization, has been vigorously promoted and applied in my country in recent years. Composite slabs, as the most widely used horizontal component in prefabricated buildings, mainly take two forms: reinforced truss composite slabs (for PC structures) and reinforced truss floor decks (for steel structures). Traditional composite slab technology involves prefabricating a concrete base slab (typically 60-80mm thick) and reinforcing steel trusses in a factory, transporting them to the site, tying the reinforcing steel, and pouring a cast-in-place concrete layer of at least 70mm thick to ultimately form an integral floor slab system. Although traditional composite slab technology reduces the use of on-site scaffolding and formwork, many technical problems still need to be solved in practical engineering applications. First, the connection reliability is poor; existing connection methods cannot guarantee a tight connection and integrity between composite slabs, becoming a weak point in the structure. Second, construction efficiency is low; the installation process is complex, requiring a large amount of on-site support and formwork, resulting in a long construction period. Third, quality control is difficult; installation accuracy is hard to guarantee, and common quality defects such as grout leakage, seepage, and cracking are prevalent. Secondly, the high cost, including large quantities of materials, high transportation costs, and numerous implementation expenses, makes the overall construction cost uncompetitive. Thirdly, the low level of standardization, constrained by multiple factors, makes it difficult to achieve high standardization and large-scale production. These technical problems severely restrict the further promotion and application of prefabricated buildings, necessitating a new type of composite slab assembly structure and construction method to fundamentally solve these problems and improve the quality, efficiency, and economic benefits of prefabricated buildings. Summary of the Invention

[0003] Therefore, it is necessary to propose a prefabricated composite slab assembly structure and its construction method to address the aforementioned problems in the existing technology.

[0004] The first technical solution of this invention is: A prefabricated composite slab assembly structure includes a top prefabricated slab and a matching bottom prefabricated slab. The bottom prefabricated slab and the top prefabricated slab are connected and fixed in the vertical and horizontal directions by a tenon and mortise connection mechanism. After the bottom prefabricated slab and the top prefabricated slab are connected and fixed by the tenon and mortise connection mechanism, the two cannot move relative to each other in the vertical and horizontal directions. A concrete pouring cavity is formed between the bottom prefabricated slab and the top prefabricated slab after they are connected and fixed by the tenon and mortise connection mechanism. A concrete layer is poured into the concrete pouring cavity, wherein the concrete layer is formed by pouring concrete after the bottom prefabricated slab and the top prefabricated slab are connected and fixed by the tenon and mortise connection mechanism.

[0005] Optionally, the mortise and tenon connection mechanism includes multiple tenon structures on the upper surface of the bottom precast slab and multiple mortise structures on the lower surface of the top precast slab. The tenon structures and the multiple mortise structures are matched one-to-one and interlocked. The multiple tenon structures are evenly distributed in the central and peripheral areas of the upper surface of the bottom precast slab, and the multiple mortise structures are evenly distributed in the central and peripheral areas of the lower surface of the top precast slab. After the bottom precast slab and the top precast slab are connected and fixed by the mortise and tenon connection mechanism, all four sides of the concrete pouring cavity can be used for concrete pouring. The cross-section of the tenon structure is trapezoidal, and its height h satisfies 0.2 ≤ h / H ≤ 0.4 with respect to the thickness H of the bottom precast slab, and the width b of the tenon structure satisfies 0.1 ≤ b / B ≤ 0.3 with respect to the width B of the bottom precast slab.

[0006] Optionally, the bottom precast slab and the plurality of tenon structures are integrally formed, the top precast slab and the plurality of mortise structures are integrally formed, the 28-day compressive strength f{cg} of the concrete layer is ≥60MPa, the flowability L is ≥200mm, and it satisfies the formula f{cg}≥1.5f_c, where f_c is the concrete compressive strength corresponding to the bottom precast slab and the top precast slab.

[0007] Optionally, the mortise and tenon connection mechanism further includes a shear reinforcement assembly, which includes multiple shear reinforcement bars that pass vertically through the tenon structure and the mortise structure. The diameter d of the shear reinforcement bars satisfies 8mm≤d≤16mm, and the cross-sectional area A{sv} of the shear reinforcement bars and the cross-sectional area A_t of the tenon structure satisfy A{sv} / A_t=0.02~0.05.

[0008] Optionally, the arrangement spacing s of all the shear reinforcement bars and the height h of the tenon structure satisfy s≤h / 2, and the anchorage length l_a of the shear reinforcement bars in the tenon structure satisfies l_a≥max(20d,150mm).

[0009] Optionally, the fit gap δ between all the tenon structures and the mortise structures that mate with them satisfies δ≤0.5mm, and the inclination angle α of the tenon structure and the inclination angle β of the mortise structure satisfies |α-β|≤0.5°.

[0010] Optionally, the concrete strength grade of the top precast slab and the bottom precast slab is not lower than C30, and the top precast slab is provided with a top-level reinforcing steel mesh, the bottom precast slab is provided with a bottom-level reinforcing steel mesh, the top-level reinforcing steel mesh and the bottom-level reinforcing steel mesh are connected by connecting steel bars, and the diameter D of the connecting steel bars satisfies D≥12mm.

[0011] Optionally, a sealing strip is provided around the tenon and mortise connection mechanism, wherein the compression ratio η of the sealing strip satisfies 20%≤η≤40%, and the elastic modulus E_s of the sealing strip and the elastic modulus E_c of concrete satisfy 0.001≤E_s / E_c≤0.01.

[0012] The second technical solution of this invention is: A construction method for a prefabricated composite slab assembly structure as described in any of the above claims includes the following steps: Step 1, fabricating the top prefabricated slab and the bottom prefabricated slab respectively, prefabricating the tenon structure on the upper surface of the bottom prefabricated slab, and prefabricating the mortise structure on the lower surface of the top prefabricated slab; Step 2, transporting the fabricated top prefabricated slab and the bottom prefabricated slab to the construction site and stacking them according to the construction sequence; Step 3, hoisting the bottom prefabricated slab to the designed position and temporarily fixing it, then hoisting the top prefabricated slab above the bottom prefabricated slab, and using the tenon structure and the mortise structure as guides for initial installation. Step 1: Positioning; Step 4: Slowly lower the top precast slab to accurately insert the tenon structure into the mortise structure, controlling the alignment accuracy so that the axial deviation between the tenon structure and the mortise structure is Δ≤2mm; Step 5: Pour concrete into the concrete pouring cavity through any one of the four sides corresponding to the concrete pouring cavity, wherein the concrete pouring pressure P satisfies 0.2MPa≤P≤0.5MPa, and pour until the concrete overflows from the concrete pouring cavity; Step 6: After pouring, perform curing, with a curing time t≥7 days and a curing temperature T satisfying 10℃≤T≤30℃, and perform quality acceptance after curing.

[0013] Optionally, in step four, the insertion speed v of the tenon structure into the mortise structure satisfies v=k√(h), where k is the speed coefficient, ranging from 0.5 to 1.0 mm / s, and h is the height of the tenon structure; in step five, the concrete pouring flow rate Q and the cross-sectional area A_c of the side of the concrete pouring cavity satisfy Q=μ·A_c·√(2P / ρ), where μ is the flow rate coefficient, ranging from 0.6 to 0.8, and ρ is the concrete density.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Traditional composite slab construction requires a large amount of on-site pouring, which involves a lot of wet work, long construction period, and difficulty in quality control. This invention achieves "dry method as the main method and wet method as the auxiliary method" by prefabricating mortise and tenon joints in the factory and quickly assembling and pouring on site, which greatly reduces the amount of on-site work and improves construction efficiency and quality stability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] in: Figure 1 This is a schematic vertical cross-sectional view of the overall structure of the prefabricated composite slab assembly structure in one embodiment; Figure 2 This is a vertical cross-sectional schematic diagram of the bottom prefabricated slab of the assembled composite slab structure in one embodiment; Figure 3 This is a bottom view of the top prefabricated slab of the assembled composite slab structure in one embodiment; Figure 4 This is a flowchart illustrating one implementation method of the construction method for a prefabricated composite slab assembly structure in one embodiment. Detailed Implementation

[0017] 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 some embodiments of the present invention, and not all embodiments. 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.

[0018] Please see Figure 1-3 , combined Figure 1-3 It can be seen that an assembly structure 100 of prefabricated composite slabs according to an embodiment of the present invention includes a top prefabricated slab 2 and a bottom prefabricated slab 1 that is matched and assembled therewith. The bottom prefabricated slab 1 and the top prefabricated slab 2 are connected and fixed in the vertical and horizontal directions by a tenon and mortise connection mechanism.

[0019] After the bottom precast slab 1 and the top precast slab 2 are connected and fixed by the tenon and mortise connection mechanism, they cannot move relative to each other in the vertical and horizontal directions. A concrete pouring cavity is formed between the bottom precast slab 1 and the top precast slab 2 after they are connected and fixed by the tenon and mortise connection mechanism. A concrete layer 3 is poured in the concrete pouring cavity. The concrete layer 3 is formed by pouring concrete after the bottom precast slab 1 and the top precast slab 2 are connected and fixed by the tenon and mortise connection mechanism.

[0020] In this process, after the concrete layer 3 is poured into the concrete pouring cavity, the bottom precast slab 1, the top precast slab 2 and the concrete layer 3 are integrated into a single structure. Unlike existing technologies, it is not necessary to pour concrete on the precast slab, which can avoid damage or cracking of the composite slab.

[0021] The concrete pouring cavity formed between the bottom precast slab 1 and the top precast slab 2, which are fixed by the mortise and tenon connection mechanism, has three sealed sides (sealed only by the mortise and tenon connection mechanism) and only one open side. When pouring concrete, it is poured from the open side, which avoids the need for workers to seal the other three sides before pouring concrete.

[0022] In this embodiment, optionally, the tenon and mortise connection mechanism includes a plurality of tenon structures 4 disposed on the upper surface of the bottom precast plate 1 and a plurality of mortise structures 5 disposed on the lower surface of the top precast plate 2, wherein the tenon structures 4 and the plurality of mortise structures 5 are matched one-to-one and interlocked with each other.

[0023] Among them, multiple tenon structures 4 are evenly arranged on the middle area and the surrounding edge area of ​​the upper surface of the bottom precast slab 1, and multiple mortise structures 5 are evenly arranged on the middle area and the surrounding edge area of ​​the lower surface of the top precast slab 2. After the bottom precast slab 1 and the top precast slab 2 are connected and fixed by the tenon and mortise connection mechanism, the four sides of the concrete pouring cavity can be used for pouring concrete.

[0024] The tenon structure 4 has a trapezoidal cross-section, and its height h is related to the thickness H of the bottom precast plate 1 by 0.2 ≤ h / H ≤ 0.4. This is an empirical threshold and is not limited here. The width b of the tenon structure 4 is related to the width B of the bottom precast plate 1 by 0.1 ≤ b / B ≤ 0.3. This is an empirical threshold and is not limited here.

[0025] The formulas h / H and b / B in this invention ensure a reasonable dimensional ratio for the mortise and tenon structure 5, guaranteeing connection strength while avoiding excessive weakening of the precast slab cross-section.

[0026] In this embodiment, optionally, the bottom precast slab 1 and the plurality of tenon structures 4 are integrally formed, the top precast slab 2 and the plurality of mortise structures 5 are integrally formed, the 28-day compressive strength f{cg} of the concrete layer 3 is ≥60MPa, the flowability L is ≥200mm, and satisfies the formula f{cg}≥1.5f_c, where f_c is the concrete compressive strength corresponding to the bottom precast slab 1 and the top precast slab 2.

[0027] In this invention, the formula f_{cg}≥1.5f_c ensures that the strength of the poured concrete is higher than that of the precast concrete, thus forming a strong connection node.

[0028] In this embodiment, optionally, the tenon and mortise connection mechanism further includes a shear reinforcement assembly. The shear reinforcement assembly includes multiple shear reinforcement bars (not shown in the figure) that pass vertically through the tenon structure 4 and the mortise structure 5. The diameter d of the shear reinforcement bars satisfies 8mm≤d≤16mm, and the cross-sectional area A{sv} of the shear reinforcement bars and the cross-sectional area A_t of the tenon structure 4 satisfy A{sv} / A_t=0.02~0.05.

[0029] This invention introduces shear-resistant steel reinforcement components, which can significantly enhance the shear resistance of mortise and tenon joints. The formula A_{sv} / A_t scientifically determines the steel reinforcement ratio, enabling cost control while ensuring shear performance.

[0030] In this embodiment, optionally, the arrangement spacing s of all the shear reinforcement bars and the height h of the tenon structure 4 satisfy s≤h / 2, and the anchorage length l_a of the shear reinforcement bars in the tenon structure 4 satisfies l_a≥max(20d,150mm).

[0031] In this invention, the arrangement of shear reinforcement is quantitatively limited. By limiting the spacing s≤h / 2, the effective transmission of shear force is ensured, and the anchorage length formula l_a≥max(20d,150mm) guarantees the reliability of the reinforcement anchorage.

[0032] In this embodiment, optionally, the fitting gap δ between all the tenon structures 4 and the mortise structures 5 that they cooperate with satisfies δ≤0.5mm, and the inclined angle α of the tenon structure 4 and the inclined angle β of the mortise structure 5 satisfies |α-β|≤0.5°.

[0033] The present invention ensures the precision of the mortise and tenon joint by strictly controlling the gap δ≤0.5mm and the angle difference |α-β|≤0.5°, which can reduce installation errors and improve the connection quality.

[0034] In this embodiment, optionally, the concrete strength grade of the top precast slab 2 and the bottom precast slab 1 is not lower than C30, and the top precast slab 2 is provided with a top-level reinforcing steel mesh (not shown in the figure), and the bottom precast slab 1 is provided with a bottom-level reinforcing steel mesh (not shown in the figure). The top-level reinforcing steel mesh and the bottom-level reinforcing steel mesh are connected by connecting steel bars, and the diameter D of the connecting steel bars satisfies D≥12mm.

[0035] In this invention, the strength of the main structure is ensured by limiting the precast slab material and reinforcement requirements, and the integrity of the upper and lower precast slabs is guaranteed by limiting the diameter D of the connecting steel bars to ≥12mm.

[0036] In this embodiment, optionally, a sealing strip (not shown in the figure) is provided around the tenon and mortise connection mechanism. The compression ratio η of the sealing strip satisfies 20%≤η≤40%, and the elastic modulus E_s of the sealing strip and the elastic modulus E_c of concrete satisfy 0.001≤E_s / E_c≤0.01.

[0037] In this invention, by adding a sealing strip and limiting the compression ratio η and the elastic modulus ratio E_s / E_c, the sealing and waterproofing effect is guaranteed, while stress concentration caused by stiffness mismatch is avoided.

[0038] Please see Figure 4 , combined Figure 4 It can be seen that the construction method of the prefabricated composite slab assembly structure 100 according to an embodiment of the present invention includes the following steps: Step 1: Fabricate the top precast plate 2 and the bottom precast plate 1 respectively, and precast the tenon structure 4 on the upper surface of the bottom precast plate 1 and the mortise structure 5 on the lower surface of the top precast plate 2. The bottom precast plate 1 and the tenon structure 4 are ultimately integrally formed, and the top precast plate 2 and the mortise structure 5 are also ultimately integrally formed.

[0039] Step two: Transport the completed top precast slab 2 and bottom precast slab 1 to the construction site and stack them according to the construction sequence.

[0040] The underlying precast slab 1 can be placed directly on flat ground without the need for support rods, thus reducing manpower and material resources.

[0041] Step 3: Hoist the bottom precast slab 1 to the designed position and temporarily fix it. Then, hoist the top precast slab 2 above the bottom precast slab 1 and perform preliminary positioning by guiding the tenon structure 4 and the mortise structure 5.

[0042] Step 4: Slowly lower the top precast plate 2 so that the tenon structure 4 is accurately inserted into the mortise structure 5, and control the docking accuracy so that the axial deviation between the tenon structure 4 and the mortise structure 5 is Δ≤2mm.

[0043] Step 5: Pour concrete into the concrete pouring cavity through any one of the four sides corresponding to the concrete pouring cavity, wherein the pouring pressure P of the concrete satisfies 0.2MPa≤P≤0.5MPa, and pour until the concrete overflows from the concrete pouring cavity.

[0044] Step 6: After pouring, carry out curing. The curing time t must be t≥7 days and the curing temperature T must be 10℃≤T≤30℃. After curing, carry out quality acceptance.

[0045] The construction method of this invention is a complete construction process, covering all key steps from prefabrication, transportation, installation to pouring and curing. Parameters such as docking accuracy Δ≤2mm and pouring pressure 0.2-0.5MPa ensure construction quality.

[0046] In this embodiment, optionally, in step four, the insertion speed v of the tenon structure 4 into the mortise structure 5 satisfies v=k√(h), where k is the speed coefficient, with a value range of 0.5~1.0mm / s, and h is the height of the tenon structure 4; In step five, the concrete pouring flow rate Q and the cross-sectional area A_c of the concrete pouring cavity side satisfy Q=μ·A_c·√(2P / ρ), where μ is the flow rate coefficient, with a value range of 0.6 to 0.8, and ρ is the concrete density.

[0047] The insertion speed formula v=k√(h) of the present invention ensures that the tenon structure 4 is smoothly inserted into the mortise structure 5, avoiding impact damage. The concrete layer 3 pouring flow rate formula Q=μ·A_c·√(2P / ρ) of the present invention can scientifically control the concrete pouring process and ensure the concrete pouring density.

[0048] The beneficial effects of this invention are reflected in the following aspects: 1. This invention features a novel design with vertical mortise and tenon joints. Traditional composite slab connections are mostly horizontal splicing or reinforced concrete pouring. This invention uses vertical mortise and tenon joints, similar to those in ancient wooden structures, allowing the upper slab to "lock" onto the lower slab. This vertical mortise and tenon joint is a completely new approach in the field of composite slabs.

[0049] 2. This invention employs a dual-security mechanism of "mortise and tenon joint + pouring". Simple mortise and tenon joints may still have gaps and loosening issues. This invention forms a dual connection of "mechanical interlocking + chemical bonding" after pouring concrete. This is similar to using mortise and tenon joints to hold two boards together, and then injecting "glue" to firmly bond them together, greatly improving the connection strength.

[0050] 3. This invention has a scientifically quantified parameter system. It's not simply about "using mortise and tenon joints," but rather about precisely defining the connection through a series of mathematical formulas and parameter ranges. For example, the tenon height is 20%-40% of the board thickness; this range is the optimal value derived from numerous experiments—too short and the connection will be weak, too high and it will weaken the board's strength. These formulas make the technical solution clearer and more feasible.

[0051] 4. This invention employs a clever integration of shear-resistant reinforcement. Shear-resistant reinforcement is inserted into the mortise and tenon structure 5, essentially adding a "reinforcing steel skeleton" to the mortise and tenon. The reinforcement mainly resists horizontal shear force, while the mortise and tenon mainly bears vertical pressure. The two work together to enable the joint to resist both compression and shear, significantly improving its seismic performance.

[0052] 5. This invention enables precise construction control. The construction method specifies accurate installation parameters. For example, the insertion speed of the tenon must be controlled according to the formula v=k√(h)—the higher the tenon, the faster the insertion speed can be, but it must be smooth and slow. This quantitative control avoids quality fluctuations caused by construction based on experience.

[0053] 6. This invention addresses a key industry pain point: traditional composite slab construction requires extensive on-site pouring, resulting in numerous wet operations, long construction periods, and difficulty in quality control. This invention, through factory prefabrication of tenons and mortise joints and rapid on-site assembly and pouring, achieves a "dry method as the primary approach, supplemented by wet methods" approach, significantly reducing on-site work and improving construction efficiency and quality stability.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A prefabricated composite slab assembly structure, characterized in that, It includes a top precast slab and a matching bottom precast slab, wherein the bottom precast slab and the top precast slab are connected and fixed in the vertical and horizontal directions by a tenon and mortise connection mechanism; After the bottom precast slab and the top precast slab are connected and fixed by the tenon and mortise connection mechanism, they cannot move relative to each other in the vertical and horizontal directions. A concrete pouring cavity is formed between the bottom precast slab and the top precast slab after they are connected and fixed by the tenon and mortise connection mechanism. A concrete layer is poured in the concrete pouring cavity. The concrete layer is formed by pouring concrete after the bottom precast slab and the top precast slab are connected and fixed by the tenon and mortise connection mechanism.

2. The prefabricated composite slab assembly structure according to claim 1, characterized in that, The mortise and tenon connection mechanism includes multiple tenon structures on the upper surface of the bottom precast slab and multiple mortise structures on the lower surface of the top precast slab. The tenon structures and the multiple mortise structures are matched one-to-one and fit together. Among them, multiple tenon structures are evenly arranged in the middle area and the surrounding edge area of ​​the upper surface of the bottom precast slab, and multiple mortise structures are evenly arranged in the middle area and the surrounding edge area of ​​the lower surface of the top precast slab. After the bottom precast slab and the top precast slab are connected and fixed by the tenon and mortise connection mechanism, the four sides of the concrete pouring cavity can be used for pouring concrete. The cross-section of the tenon structure is trapezoidal, and its height h satisfies 0.2≤h / H≤0.4 with respect to the thickness H of the bottom precast slab. The width b of the tenon structure satisfies 0.1≤b / B≤0.3 with respect to the width B of the bottom precast slab.

3. The prefabricated composite slab assembly structure according to claim 2, characterized in that, The bottom precast slab and the multiple tenon structures are integrally formed, the top precast slab and the multiple mortise structures are integrally formed, the 28-day compressive strength of the concrete layer is f{cg}≥60MPa, the flowability L≥200mm, and it satisfies the formula f{cg}≥1.5f_c, where f_c is the concrete compressive strength corresponding to the bottom precast slab and the top precast slab.

4. The prefabricated composite slab assembly structure according to claim 1, characterized in that, The mortise and tenon connection mechanism further includes a shear reinforcement assembly, which includes multiple shear reinforcement bars that pass vertically through the tenon structure and the mortise structure. The diameter d of the shear reinforcement bars satisfies 8mm≤d≤16mm, and the cross-sectional area A{sv} of the shear reinforcement bars and the cross-sectional area A_t of the tenon structure satisfy A{sv} / A_t=0.02~0.

05.

5. The prefabricated composite slab assembly structure according to claim 4, characterized in that, The spacing s of all the shear reinforcement bars and the height h of the tenon structure satisfy s≤h / 2, and the anchorage length l_a of the shear reinforcement bars in the tenon structure satisfies l_a≥max(20d,150mm).

6. The prefabricated composite slab assembly structure according to claim 1, characterized in that, The fit gap δ between all the tenon structures and the mortise structures that mate with them satisfies δ≤0.5mm, and the inclination angle α of the tenon structure and the inclination angle β of the mortise structure satisfies |α-β|≤0.5°.

7. The prefabricated composite slab assembly structure according to claim 1, characterized in that, The concrete strength grade of the top and bottom precast slabs is not lower than C30, and the top precast slab is provided with a top-level reinforcing steel mesh, and the bottom precast slab is provided with a bottom-level reinforcing steel mesh. The top-level reinforcing steel mesh and the bottom-level reinforcing steel mesh are connected by connecting steel bars, and the diameter D of the connecting steel bars satisfies D≥12mm.

8. The prefabricated composite slab assembly structure according to claim 1, characterized in that, A sealing strip is provided around the tenon and mortise connection mechanism. The compression ratio η of the sealing strip satisfies 20%≤η≤40%, and the elastic modulus E_s of the sealing strip and the elastic modulus E_c of concrete satisfy 0.001≤E_s / E_c≤0.

01.

9. A construction method for a prefabricated composite slab assembly structure as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Fabricate the top precast slab and the bottom precast slab respectively, and precast the tenon structure on the upper surface of the bottom precast slab and the mortise structure on the lower surface of the top precast slab; Step 2: Transport the completed top-layer precast slab and bottom-layer precast slab to the construction site and stack them according to the construction sequence; Step 3: Hoist the bottom precast slab to the designed position and temporarily fix it, then hoist the top precast slab above the bottom precast slab and perform preliminary positioning by guiding the tenon and mortise structure; Step 4: Slowly lower the top precast plate to accurately insert the tenon structure into the mortise structure, and control the docking accuracy so that the axial deviation between the tenon structure and the mortise structure is Δ≤2mm; Step 5: Pour concrete into the concrete pouring cavity through any one of the four sides corresponding to the concrete pouring cavity, wherein the pouring pressure P of the concrete satisfies 0.2MPa≤P≤0.5MPa, and pour until the concrete overflows from the concrete pouring cavity. Step 6: After pouring, carry out curing. The curing time t must be t≥7 days and the curing temperature T must be 10℃≤T≤30℃. After curing, carry out quality acceptance.

10. The construction method of the prefabricated composite slab assembly structure according to claim 9, characterized in that, In step four, the insertion speed v of the tenon structure into the mortise structure satisfies v=k√(h), where k is the speed coefficient, ranging from 0.5 to 1.0 mm / s, and h is the height of the tenon structure; in step five, the concrete pouring flow rate Q and the cross-sectional area A_c of the side of the concrete pouring cavity satisfy Q=μ·A_c·√(2P / ρ), where μ is the flow rate coefficient, ranging from 0.6 to 0.8, and ρ is the concrete density.

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