A concrete modular superposition structure and assembly method

Abstract

The application provides a concrete modular superposition structure and an assembling method, which comprises a base, a plurality of splicing modules, a first splicing module and a second splicing module which are oppositely arranged, and at least one intermediate splicing module, the first splicing module, the intermediate splicing module and the second splicing module are sequentially connected, and two adjacent splicing modules are connected through a splicing structure, the splicing structure comprises two splicing surfaces which are spaced apart and form a pouring cavity therebetween, the first splicing module and the second splicing module have thicknesses d1 and d2, and the pouring cavity and the two splicing surfaces jointly form a thickness d3, and the technical problems of complex on-site construction process and low efficiency caused by low integration of prefabricated modules, separation of structural members and construction formwork functions, small rigidity of prefabricated floors, inability to avoid support, and a large number of formwork support erection, steel bar binding and cast-in-place on site are solved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a modular composite concrete structure and its assembly method. Background Technology

[0002] Existing modular concrete structural systems have the following characteristics: 1. Shear wall and beam formwork do not participate in structural load-bearing; they are only used as formwork for cast-in-place shear walls and beams. Currently, exterior shear walls and beams use single-sided wall and beam formwork, while interior shear walls and beams use double-sided wall and beam formwork. Since none of these formworks participate in structural load-bearing, aluminum or wooden formwork needs to be added on-site, and horizontal tie rods are required for reinforcement before cast-in-place construction of the structural shear walls and beams can proceed. Therefore, structural, finishing, and electromechanical processes cannot be completed in these locations during the factory stage. 2. The formwork top slab has low stiffness, requires numerous vertical supports, and does not achieve support-free construction, resulting in a large workload for overlapping cast-in-place work. Currently, the reinforced concrete composite slab of the formwork top plate is generally about 60mm thick. It can serve as the formwork for the upper composite cast-in-place layer and participate in load-bearing. However, the composite slab has relatively low stiffness, and a vertical support system with certain spacing is still required at the bottom of the slab. Furthermore, the cast-in-place layer on the composite slab still requires the entire floor to be cast in place, resulting in a large amount of on-site casting work. 3. The structural shear walls and beams are relatively thick, occupying building space. The final thickness of the exterior shear walls (cast-in-place shear walls + single-sided wall formwork) is more than 30mm thicker than conventional walls; the thickness of the interior shear walls (cast-in-place shear walls + double-sided modules) is more than 60mm thicker than conventional walls, reducing the net interior dimensions and the usable interior area. The final thickness of the exterior structural beams (cast-in-place beams + single-sided beam formwork) is more than 30mm thicker than conventional beams; the thickness of the interior structural beams (cast-in-place shear walls + double-sided modules) is more than 60mm thicker than conventional beams, resulting in exposed beams inside the interior, affecting the aesthetics and requiring finishing treatment. 4. The integration of structural components (shear walls, beams, slabs) in the factory-produced concrete modules is low, the on-site construction process is complex, and the improvement of construction efficiency is not obvious. The factory-prefabricated concrete module units only include the module bottom plate (structural bottom plate), the module top plate (truss reinforced concrete composite slab), the infill walls around the module, wall formwork, and beam formwork. The modules produced in the factory do not integrate structural components as much as possible, resulting in a large amount of construction work for formwork and support, rebar binding, and concrete pouring on site. For example: (1) Aluminum or wooden formwork needs to be added to the wall formwork and beam formwork on site, and horizontal tie rods are used to reinforce the wall formwork and beam formwork to prevent deformation; (2) The module top plate has low stiffness, and vertical support needs to be added on site to meet the load requirements of the construction stage; (3) The rebar binding and concrete pouring of the structural shear walls, beams, and composite slab cast-in-place layers all need to be completed on site. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a modular composite concrete structure and assembly method, which solves the technical problems of low integration of prefabricated modules with structural components, separation of functions between structural components and construction formwork, low stiffness of prefabricated floor slabs that cannot be without support, and the need for a large number of formwork support erections, rebar binding and cast-in-place on site, which lead to complex on-site construction procedures and low efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a modular composite concrete structure, comprising:

[0005] Base;

[0006] A splicing unit is disposed on the base and includes multiple splicing modules. Among the multiple splicing modules, there is a first splicing module and a second splicing module arranged opposite to each other in the same direction, and at least one intermediate splicing module located between the first splicing module and the second splicing module. The first splicing module, the intermediate splicing module and the second splicing module are connected in sequence, and adjacent splicing modules are connected by a splicing structure.

[0007] The splicing structure includes two splicing surfaces spaced apart, which are respectively formed on the two opposite end faces of two adjacent splicing modules, forming a casting cavity between them;

[0008] The first end face of the first splicing module and the end face of the second splicing module have thicknesses d1 and d2 respectively, and the casting cavity and the two splicing surfaces together form a thickness d3, satisfying d1=d2=2d3;

[0009] The base has multiple first reference points, and multiple splicing modules are set one-to-one with the multiple first reference points, so that the splicing modules are constructed into a first force-bearing area with the corresponding first reference point as the reference.

[0010] The splicing surface has multiple second reference points, which are used to make one of the adjacent splicing modules a reference point relative to the second reference point on the other, and to construct a second force-bearing area.

[0011] Furthermore, the splicing module has multiple connecting surfaces, which are connected to the prefabricated modules on the periphery of the splicing module and the prefabricated top plate on its top surface.

[0012] Furthermore, both the prefabricated module and the prefabricated top slab are provided with a casting groove, and the thickness of the casting groove is consistent with the thickness of the casting cavity.

[0013] Furthermore, the base is provided with a plurality of first hollow overlapping holes, and the first splicing module, the intermediate splicing module and the second splicing module are provided with a plurality of second hollow overlapping holes corresponding to the first hollow overlapping holes, for the steel cage to pass through.

[0014] Furthermore, the splicing structure includes a plurality of rectangular steel bars disposed on two splicing surfaces, wherein the rectangular steel bars on adjacent splicing surfaces are used for vertical passage of connecting steel bars.

[0015] Furthermore, spiral reinforcing bars are provided inside the first hollow overlapping hole, the second hollow overlapping hole, and the casting cavity.

[0016] The present invention also provides an assembly method, comprising the above-described modular composite concrete structure, the assembly method comprising the following steps:

[0017] S1: Base construction, the base is reserved with the first hollow overlapping hole required for anchoring the steel bars of the vertical force-bearing splicing module into the foundation. The top of the base is leveled with cement mortar. The positioning control line for hoisting the first layer splicing module is marked on the top. Special shims are used to level it to the design elevation required for hoisting the first layer splicing module.

[0018] S2: Use a special balancing hanger to start hoisting the first-floor splicing module. When the splicing module falls to a vertical elevation of about 500mm, align it with the hoisting positioning control line released from the top of the base, and slowly lower it. Check that the second hollow overlapping hole of the first-floor splicing module is aligned with the first hollow overlapping hole of the base. Then, slowly lower the splicing module to the base. Use a level and a vertical measuring ruler to check the flatness and verticality of the splicing module. After confirming that there are no errors, release the hook and remove the special balancing hanger.

[0019] S3: Install connecting steel bars in the second hollow overlapping hole of the first-layer splicing module and lower them into the first hollow overlapping hole of the base to ensure that the lapped connecting steel bars are anchored into the foundation to meet the anchorage length and that the lap connection height with the vertical force-bearing connecting steel bars of the first-layer splicing module meets the requirements.

[0020] S4: Pour non-shrink concrete into the second hollow overlapping hole of the first-layer splicing module;

[0021] S5: The top of the first-layer splicing module is leveled with cement mortar. The positioning control line for the hoisting of the second-layer splicing module is laid out on the top of the first-layer splicing module. Special shims are used to level it to the design elevation required for the hoisting of the second-layer splicing module.

[0022] S6: Repeat steps 2-4 above to hoist the second-layer splicing module, install connecting steel bars in the second hollow overlapping hole of the second-layer splicing module, and pour non-shrink concrete in the second hollow overlapping hole of the second-layer splicing module.

[0023] S7: Floors above the second floor shall be constructed in the same order as the second floor until the building is completed.

[0024] Furthermore, in step S3, the lap length of the connecting steel bars is less than the length of the second hollow composite hole.

[0025] Furthermore, in step S4, the top elevation of the poured non-shrink concrete is raised to the elevation of the connecting steel bars that extend into the second hollow overlapping hole of the second-layer splicing module and penetrate into the second hollow overlapping hole of the first-layer splicing module.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The prefabricated modular units realize the integrated integration of structural components (composite shear walls, composite beams, and top slabs) in the factory stage, and all steel bars are pre-tied in the factory. After the prefabricated modular units are spliced ​​on the construction site, only simple lap connection of the stressed connecting steel bars is required. Then, concrete is poured in the overlapping cavities around the composite shear walls, composite beams, and top slabs on the splicing surface to form a complete composite structural system for the entire building, making the on-site construction process simpler and the construction efficiency higher.

[0028] (2) After the prefabricated modular units are assembled on site, the structural components of the prefabricated modular units (composite shear walls, composite beams, and top slabs) serve as the peripheral formwork for the on-site composite concrete, thus achieving both the elimination of formwork and participation in structural stress.

[0029] (3) Most of the prefabricated modular unit top slabs are fully prefabricated, with only a small area around them requiring overlapping and post-casting. The floor slabs have high rigidity, achieving the goal of eliminating the need for formwork and supports.

[0030] (4) The thickness of the structural components (walls and beams) after the prefabricated modular units are spliced ​​and stacked is consistent with that of traditional cast-in-place construction, thus eliminating the need for additional building interior space. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the base structure in one embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram showing the connection between the splicing unit and the base in one embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram showing the connection between the splicing unit and the base at another location in one embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the overall structure of the splicing unit connected to the base in one embodiment of the present invention;

[0035] Figure 5This is a schematic diagram of the overall structure of the double-layer splicing unit connected to the base in one embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of the first splicing module connected to the base in one embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the intermediate splicing module connected to the base in one embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the structure of the first splicing module in one embodiment of the present invention;

[0039] Figure 9 This is a cross-sectional schematic diagram of the first splicing module in one embodiment of the present invention;

[0040] Figure 10 This is a schematic diagram of the structure of the first splicing module after casting in one embodiment of the present invention;

[0041] Figure 11 This is a schematic cross-sectional view of the first splicing module after casting in one embodiment of the present invention;

[0042] Figure 12 This is a schematic diagram of the structure of the first splicing module for binding steel bars in one embodiment of the present invention;

[0043] Figure 13 This is a cross-sectional structural diagram of the first splicing module binding steel bars in one embodiment of the present invention;

[0044] Figure 14 This is a schematic diagram of the structure for binding reinforcing bars in the intermediate splicing module according to one embodiment of the present invention;

[0045] Figure 15 This is a schematic diagram of an intermediate splicing module in one embodiment of the present invention;

[0046] Figure 16 This is a schematic diagram of the casting of the intermediate splicing module in one embodiment of the present invention;

[0047] Figure 17 This is a schematic diagram of the overlapping structure of adjacent intermediate splicing modules in one embodiment of the present invention;

[0048] Figure 18 This is a schematic diagram of an intermediate splicing module in one embodiment of the present invention;

[0049] Figure 19 This is a top view of the rebar binding of the first splicing module in one embodiment of the present invention;

[0050] Figure 20 This is a top view of the steel reinforcement binding of the intermediate splicing module in one embodiment of the present invention;

[0051] Figure 21 This is a top view of the intermediate splicing module in one embodiment of the present invention;

[0052] Figure 22 This is a partial cross-sectional structural diagram of the intermediate splicing module in one embodiment of the present invention;

[0053] Figure 23 This is a schematic diagram of a partial cross-sectional structure of the intermediate splicing module after casting in one embodiment of the present invention;

[0054] Figure 24 This is a schematic diagram of the steel reinforcement binding between the intermediate splicing module and the precast top slab in one embodiment of the present invention;

[0055] Figure 25 This is a schematic diagram of the connection between the first-layer splicing module shear wall and the base in one embodiment of the present invention;

[0056] Figure 26 This is a schematic diagram of the connection between the upper and lower layer splicing module shear walls in one embodiment of the present invention.

[0060] The reference numerals in the accompanying drawings include:

[0061] 1. Base; 2. First splicing module; 3. Middle splicing module; 4. Second splicing module; 5. Precast module; 6. Precast top slab; 7. Casting cavity; 8. Casting groove; 9. First hollow overlapping hole; 10. Second hollow overlapping hole; 11. Rectangular steel bar; 12. Connecting steel bar; 13. Spiral steel bar; 14. Steel cage; 15. Reinforcing rib; 16. Keyway; 17. Truss steel bar. Detailed Implementation

[0062] The present invention will be further described in detail below through specific embodiments:

[0063] In embodiments of the present invention, such as Figures 1-23 As shown, a modular composite concrete structure includes:

[0064] Base 1;

[0065] A splicing unit is disposed on the base 1 and includes multiple splicing modules. Among the multiple splicing modules, there is a first splicing module 2 and a second splicing module 4 arranged opposite to each other in the same direction, and at least one intermediate splicing module 3 located between the first splicing module 2 and the second splicing module 4. The first splicing module 2, the intermediate splicing module 3 and the second splicing module 4 are connected in sequence, and adjacent splicing modules are connected by a splicing structure.

[0066] The splicing structure includes two splicing surfaces spaced apart, which are respectively formed on the two opposite end faces of two adjacent splicing modules, forming a casting cavity 7 between them;

[0067] The first end face of the first splicing module 2 and the end face of the second splicing module 4 have thicknesses d1 and d2 respectively, and the casting cavity 7 and the two splicing surfaces together form a thickness d3, satisfying d1=d2=2d3;

[0068] The base 1 has multiple first reference points, and multiple splicing modules are set one-to-one with the multiple first reference points, so that the splicing modules are based on the corresponding first reference points and form a first force-bearing area.

[0069] The splicing surface has multiple second reference points, which are used to make one of the adjacent splicing modules a reference point relative to the second reference point on the other, and to construct a second force-bearing area.

[0070] In this embodiment, the composite structure consists of a base 1 and multiple splicing modules. The splicing modules are connected by a splicing structure. Both the base 1 and the splicing modules are prefabricated in the factory. During the factory stage, the structural components such as composite shear walls, composite beams, and top slabs are integrated into the splicing modules, and all steel bars are pre-tied in the factory. The base 1 is provided with a first reference point for overall positioning with the splicing modules to form a first stress area. A second reference point is provided on the splicing surface for alignment with the splicing modules to form a second stress area. Specifically, during construction, the prefabricated base 1 is first hoisted to the construction area, installed on the ground, and leveled. Then, multiple splicing modules are installed on the base 1 in sequence, from left to right. The structure consists of a first splicing module 2, an intermediate splicing module 3 (the number of intermediate splicing modules 3 depends on the building requirements), and a second splicing module 4. The first reference point of the base 1, together with the first splicing module 2, intermediate splicing module 3, and second splicing module 4, forms a vertical first load-bearing area. The intermediate splicing modules 3 are connected via a splicing structure to form a horizontal second load-bearing area (connecting steel bars 12 or steel cages 14) with the first splicing module 2, adjacent intermediate splicing modules 3, and second splicing module 4. This connects the entire splicing module into a whole, forming the lowest load-bearing layer of the building. The hoisting steps described above are then repeated sequentially on the top surface of the first floor until the building is completed. Additionally, the intermediate splicing module 3 consists of two spaced sections... The splicing surfaces of the two modules are connected, and the two splicing surfaces are respectively formed on the two opposite end faces of the two adjacent splicing modules, with a casting cavity 7 formed between them. The first end face of the first splicing module 2 and the second end face of the second splicing module 4 have thicknesses d1 and d2, respectively. The casting cavity 7 and the two splicing surfaces together form a thickness d3, and satisfy d1=d2=2d3. The casting cavity 7 is used to cast concrete in place after the splicing unit is installed, ensuring that the prefabricated part has sufficient rigidity, can serve as a stable template during the construction stage, and serve as an important load-bearing flange during the use stage. At the same time, the material distribution is optimized to make the overall prefabricated thickness consistent, without reducing the net indoor size, and the actual indoor area will not be reduced. In this invention, the splicing surface of the prefabricated splicing module ( The composite shear wall, composite beam, and top slab are designed as permanent structural components, while the cast-in-place cavity 7 is used for on-site casting of core concrete to form a composite load-bearing body. The composite walls, beams, and slabs (i.e., splice surfaces) become part of the structural layer and participate in the overall load-bearing. The splice surfaces can be completed in the factory in advance, reducing on-site formwork engineering. Through the stiffness and positioning (reference point, stress area) of the splice modules, it is possible to lay the foundation for large-span, low-support or unsupported floor slab systems (such as thickened composite slabs or the use of prestressing). The modularity is improved, reducing the amount of on-site steel reinforcement binding and casting, reducing or even eliminating vertical temporary supports, improving construction efficiency and safety, significantly reducing on-site concrete casting and steel reinforcement work, and improving the level of industrialization.The splicing structure, the first load-bearing reference point, and the second load-bearing reference point integrate the positioning, connection, and reserved height of the cast-in-place space of the structural components into the prefabricated module 5, realizing dry splicing and wet connection. The on-site process is simplified to: module hoisting, reference point alignment, splicing, and concrete pouring in the cavity. The additional external formwork and tie rods are eliminated, greatly improving the construction speed and making the quality more controllable. Furthermore, by ensuring that the thickness of the first splicing unit, the intermediate splicing unit, and the second splicing unit meets the design of d1=d2=2d3, the thickness distribution between the prefabricated module 5 and the cast-in-place is optimized, so that the total thickness of the final wall / beam is close to or equal to the conventional design thickness. This eliminates the thickness increase caused by additional formwork, increases the effective usable indoor area, avoids exposed beams or reduces their size, improves the building quality and usable floor area ratio, and reduces the need for secondary decoration to cover heavy beams and columns.

[0071] The splicing module has multiple connecting surfaces, which are connected by a prefabricated module 5 located on the periphery of the splicing module and a prefabricated top plate 6 on its top surface.

[0072] In this embodiment, prefabricated modules 5 are prefabricated in the factory, with embedded reinforcing bars and connectors. These modules 5 can integrate building exterior finishes, insulation layers, window frames, etc. Their bottom and sides are connected to the first reference point of the base 1 and the second reference point of the adjacent module (anchoring can be used). During installation, the prefabricated modules 5 are sequentially connected to the opposite end faces of the first splicing unit, the intermediate splicing unit, and the second splicing unit as the exterior facade. Vertical connecting bars 12 are tied within the casting cavity 7, and concrete is poured to form a composite vertical component. A composite cast-in-place layer is then poured on the prefabricated top slab 6, connecting each top slab into a whole, and pipelines are embedded. After the on-site concrete hardens, the factory-prefabricated modules 5 and the prefabricated top slab 6 combine with the on-site cast concrete to form a whole. The first and second load-bearing areas transfer loads through the prefabricated + cast-in-place composite structure, forming a complete load-bearing structural system. Each of the two adjacent splicing surfaces is provided with multiple reinforcing ribs arranged opposite to each other, and external reinforcing bars are tied to their opposite end faces (the first splicing module and the second splicing module are also tied with corresponding external reinforcing bars) to improve the lateral stiffness of the intermediate splicing modules after connection, to ensure that the adjacent intermediate splicing modules will not deform under lateral pressure when the concrete is poured laterally, and to ensure that the superimposed concrete does not produce out-of-plane deformation.

[0073] Both the precast module 5 and the precast top plate 6 are provided with a casting groove 8, and the thickness of the casting groove 8 is the same as the thickness of the casting cavity 7.

[0074] In this embodiment, the inner surfaces of the molds for the precast module 5 and the precast top slab 6 are provided with precise protrusions to form the required casting grooves 8 on their surfaces during the casting of the concrete structural components. The depth of these grooves (i.e., the thickness of the protruding portion) is strictly controlled to be equal to d3. The casting grooves 8 of the precast module 5 are mainly located at its top edge (for connection with the precast top slab 6) and end edges (for connection with adjacent modules). The casting grooves 8 of the precast top slab 6 are mainly located around its periphery (for connection with the top of the precast module 5 below). At the factory, the precast top slab 6 with the casting grooves 8 is aligned and connected to the precast module 5. At this time, the grooves around the top slab should be precisely aligned with the grooves on the top of the module. After the interconnected and spliced ​​modules are hoisted into place, the pouring grooves 8 on the sides of adjacent modules are aligned with each other and connected with the pouring cavities 7 naturally formed between the spliced ​​modules to form a pouring channel. The pouring grooves 8 at the joint between the precast top slab 6 and the top of the precast module 5 form a horizontally encircling concrete cavity. The horizontal grooves and vertical cavities intersect at corners, beam-column joints, and other locations to form a complex three-dimensional cast-in-place node area. Concrete is poured into the reserved pouring grooves 8. Since all pouring grooves 8 and pouring cavities 7 have the same thickness and are interconnected, the concrete can flow smoothly and fill the entire module network. After hardening, the cast-in-place concrete acts like glue and skeleton, tightly connecting the various precast components into a whole through shape-matched mechanical interlocking. In addition, keyways are provided at the interface between the precast roof slab and the cast-in-place concrete. At the same time, reinforcing truss bars are provided at the interface between adjacent precast roof slabs and cast-in-place concrete to connect all precast roof slabs into a single load-bearing unit, thereby strengthening the overall structure’s shear resistance and crack prevention. The truss bars consist of two intermittently tied connecting bars 12 and a triangular truss located between the two connecting bars 12. The purpose of this is to improve the load-bearing capacity of the precast roof slab. The triangular truss bars help to distribute the weight of the superstructure evenly, strengthen the bond between the precast roof slab and the cast-in-place concrete, and improve its shear resistance and crack prevention. The first splicing module 2 and the second splicing module 4 are also equipped with transverse reinforcing truss bars in the same binding method as described above.

[0075] The base 1 is provided with a plurality of first hollow overlapping holes 9, and the first splicing module 2, the intermediate splicing module 3 and the second splicing module 4 are provided with a plurality of second hollow overlapping holes 10 corresponding to the first hollow overlapping holes 9, for the steel cage 14 to pass through.

[0076] In this embodiment, a first hollow overlapping hole 9 is preset on the base 1, and a second hollow overlapping hole 10 is preset at the bottom of all splicing modules (first, middle, and second splicing modules 4). The first hollow overlapping hole 9 and the second hollow overlapping hole 10 are vertically aligned, and the corresponding upper and lower holes together form a vertically penetrating channel for the steel cage 14 to pass through (the steel cage adopts vertical lapped steel bars and positioning stirrups, the positioning stirrups are attached to the inner walls of the first hollow overlapping hole 9 and the second hollow overlapping hole 10, and the lapped steel bars are tied to the positioning stirrups in parallel to ensure that the lapped steel bars are positioned in the reserved holes and do not shift. The connecting steel bars of the middle splicing module can also be lapped in the same way). Then, by inserting the connecting steel bars 12 and pouring concrete, a strong structural connection that can transmit pressure and tension can be formed in the horizontal and vertical directions. Large prefabricated spatial units can be safely, reliably, and efficiently anchored onto base 1, forming an integral load-bearing structure. This achieves the construction of the first load-bearing area, providing a physical force transmission carrier for the first reference point, ensuring overall structural stability and lateral force resistance, and establishing effective vertical shear and pull-out resistance connections. Simultaneously, it simplifies installation and improves installation accuracy, providing a self-aligning guidance function. When hoisting the splicing modules, the second hollow overlapping hole 10 at the bottom of the splicing module can be aligned with the first hollow overlapping hole 9 on base 1, making the hoisting and positioning of giant splicing modules faster and more accurate, reducing on-site adjustment time, improving installation efficiency, and lowering the technical difficulty of hoisting construction.

[0077] The splicing structure includes a plurality of rectangular steel bars 11 disposed on two splicing surfaces, and the rectangular steel bars 11 on the two adjacent splicing surfaces are used for the vertical passage of the connecting steel bars 12.

[0078] In this embodiment, multiple rectangular steel bars 11 are provided on the two opposing splicing surfaces constituting the casting cavity 7. The rectangular steel bars 11 are pre-embedded in the precast concrete, with their open ends pointing outward from the splicing surfaces. When the two splicing surfaces are joined, the rectangular steel bars 11 on adjacent surfaces will be paired or staggered to form a channel or anchoring ring through which the vertical connecting steel bars 12 can pass from top to bottom. The connecting steel bars 12 are lapped on each rectangular steel bar 11, so that a strong vertical steel bar connection can be formed in the narrow casting cavity 7 without complicated on-site steel bar binding. Nodes are used to resist inter-story shear forces generated by horizontal loads (such as seismic forces), strengthen the vertical connection between splicing modules, and realize the force transfer in the second stress zone. At the vertical joints between splicing modules, reinforced concrete hidden columns or core columns that can transfer shear force, bending moment and tension are established. Rectangular steel bars 11 act as stirrups or tie bars, working together with the inserted vertical connecting steel bars 12 to truly connect the discrete modules vertically into a continuous load-bearing wall or column, ensuring that vertical and horizontal loads can be smoothly transferred along the height and preventing the joints from becoming weak links in the structure. The rectangular steel bars 11, which ensure the anchorage and constraint of the post-cast concrete, provide three-dimensional constraints for the core concrete and provide reliable lateral support (equivalent to the function of stirrups) for the vertical connecting steel bars 12 inside. Together with the casting cavity 7 and the casting groove 8, they provide a space for the cast concrete to be wrapped by a steel mesh. The mesh of rectangular steel bars 11 and the vertical connecting steel bars 12 together form a reinforced skeleton in the casting cavity 7, making the post-cast concrete and the precast part more tightly integrated and more effectively stressed. This achieves the advantages of a composite structure where 1+1>2, and the joint strength may even be higher than that of the component body.

[0079] Spiral steel bars 13 are provided in the first hollow overlapping hole 9, the second hollow overlapping hole 10, and the casting cavity 7.

[0080] In this embodiment, spiral steel bars 13 with a specified diameter and pitch are pre-wound or installed and fixed to the steel reinforcement skeleton of the component. Then, concrete is poured together. The spiral steel bars 13 are permanently embedded in the component, surrounding the first hollow overlapping hole 9, the second hollow overlapping hole 10 and the pouring cavity 7, and concrete is poured. After the concrete hardens, under the tight constraint of the spiral steel bars 13, the concrete in these areas becomes confined concrete, which together with the internal vertical connecting steel bars 12 forms a structural reinforcing core with extremely high compressive, shear and pull-out resistance.

[0081] This embodiment also provides an assembly method, including the above-described modular composite concrete structure, the assembly method comprising the following steps:

[0082] S1: Construction of base 1. The steel bars for vertical force-bearing lap connection of the splicing module are reserved in the base 1 and anchored into the first hollow overlapping hole 9 required by the foundation. The top of base 1 is leveled with cement mortar. The positioning control line for hoisting the first layer splicing module is laid out on the top. The special shims are used to level it to the design elevation required for hoisting the first layer splicing module.

[0083] S2: Use a special balance hanger to start hoisting the first-floor splicing module. When the splicing module falls to a vertical elevation of about 500mm, align it with the hoisting positioning control line released from the top of the base 1, and slowly lower it. Check that the second hollow overlapping hole of the first-floor splicing module is aligned with the first hollow overlapping hole 9 of the base 1. Then, slowly lower the splicing module to the base 1. Use a level and a vertical measuring ruler to check the flatness and verticality of the splicing module. After confirming that there are no errors, release the hook and remove the special balance hanger.

[0084] S3: Install connecting steel bars 12 in the second hollow overlapping hole 10 of the first layer splicing module, and lower them into the first hollow overlapping hole 9 of the base 1 to ensure that the lapped connecting steel bars 12 are anchored into the foundation to meet the anchorage length, and to ensure that the lap connection height with the vertical force-bearing connecting steel bars 12 of the first layer splicing module meets the requirements.

[0085] S4: Pour non-shrink concrete into the second hollow overlapping hole 10 of the first-layer splicing module;

[0086] S5: The top of the first-layer splicing module is leveled with cement mortar. The positioning control line for the hoisting of the second-layer splicing module is laid out on the top of the first-layer splicing module. Special shims are used to level it to the design elevation required for the hoisting of the second-layer splicing module.

[0087] S6: Repeat steps 2-4 above, hoist the second-layer splicing module, install the connecting steel bar 12 in the second hollow overlapping hole 10 of the second-layer splicing module, and pour non-shrink concrete in the second hollow overlapping hole 10 of the second-layer splicing module.

[0088] S7: Floors above the second floor shall be constructed in the same order as the second floor until the building is completed.

[0089] Furthermore, in step S3, the lap length of the connecting steel bar 12 is less than the length of the second hollow overlapping hole 10.

[0090] Furthermore, in step S4, the top elevation of the poured non-shrink concrete is raised to the elevation of the lapped connecting steel bars 12 inside the second hollow overlapping hole 10 of the second-layer splicing module, which extend into the second hollow overlapping hole 10 of the first-layer splicing module.

[0091] In this embodiment, non-shrink concrete is poured into the second hollow overlapping hole 10 of the first-layer splicing module. To ensure that the poured body can fit tightly with the hole wall and the connecting steel bar 12 after hardening, and to avoid shrinkage cracks affecting the connection strength and integrity, the poured concrete is poured from the top of the splicing module all the way to the bottom of the first hollow overlapping hole 9 reserved in the foundation (base). This allows the first-layer splicing module to be anchored to the base through the poured body, forming a solid vertical load-bearing component. When the second-layer splicing module is hoisted in the future, the connecting steel bar 12 extending down from the second hollow overlapping hole 10 of the second-layer splicing module can be inserted into the concrete already poured in the first-layer splicing module and overlap with the connecting steel bar 12 extending up from the second hollow overlapping hole 10 of the first-layer splicing module in the concrete pouring area. This provides sufficient overlap space for the connecting steel bars 12 of the upper and lower splicing modules, allowing them to overlap in the concrete and for the concrete to enclose the upper and lower connecting steel bars 12, forming a whole. The lap length of the reinforcing cage 14 is less than the length of the second hollow overlapping hole 10. This ensures that when the upper reinforcing cage 14 is inserted into the lower second hollow overlapping hole 10, its lap end is completely contained within the overlapping hole of this layer. It prevents the reinforcing cage 14 from being too long and pressing against the bottom of the second hollow overlapping hole 10, thus avoiding obstruction of the upper splicing module from being placed at the precise design elevation. This ensures precise control of the vertical geometric dimensions between splicing modules and achieves wet joint connection. It ensures that the reinforcing cage 14 in the lower second hollow overlapping hole 10 is completely encased in concrete, forming a firm anchorage. The upper reinforcing cage 14 falls to the top of the lower reinforcing cage 14, providing a clean connection interface for continuous pouring after the upper splicing module is installed, improving splicing speed and reducing splicing difficulty. The entire vertical reinforcing cage 14 and the splicing module form a continuous load-bearing whole, improving structural strength.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A modular composite concrete structure, characterized in that, include: Base; A splicing unit is disposed on the base and includes multiple splicing modules. Among the multiple splicing modules, there is a first splicing module and a second splicing module arranged opposite to each other in the same direction, and at least one intermediate splicing module located between the first splicing module and the second splicing module. The first splicing module, the intermediate splicing module and the second splicing module are connected in sequence, and adjacent splicing modules are connected by a splicing structure. The splicing structure includes two splicing surfaces spaced apart, which are respectively formed on the two opposite end faces of two adjacent splicing modules, forming a casting cavity between them; The first end face of the first splicing module and the end face of the second splicing module have thicknesses d1 and d2 respectively, and the casting cavity and the two splicing surfaces together form a thickness d3, satisfying d1=d2=2d3; The base has multiple first reference points, and multiple splicing modules are set one-to-one with the multiple first reference points, so that the splicing modules are constructed into a first force-bearing area with the corresponding first reference point as the reference. The splicing surface has multiple second reference points, which are used to make one of the adjacent splicing modules a reference point relative to the second reference point on the other, and to construct a second force-bearing area.

2. The modular composite concrete structure as described in claim 1, characterized in that, The splicing module has multiple connecting surfaces, which are connected to the prefabricated modules on the periphery of the splicing module and the prefabricated top plate on its top surface.

3. A modular composite concrete structure as described in claim 2, characterized in that, Both the prefabricated module and the prefabricated top slab are provided with casting grooves, and the thickness of the casting grooves is the same as the thickness of the casting cavity.

4. A modular composite concrete structure as described in claim 1, characterized in that, The base is provided with a plurality of first hollow overlapping holes, and the first splicing module, the intermediate splicing module and the second splicing module are provided with a plurality of second hollow overlapping holes corresponding to the first hollow overlapping holes, for the steel cage to pass through.

5. A modular composite concrete structure as described in claim 4, characterized in that, The splicing structure includes multiple rectangular steel bars on two splicing surfaces, and the rectangular steel bars on adjacent splicing surfaces are used for vertical passage of connecting steel bars.

6. A modular composite concrete structure as described in claim 4 or 5, characterized in that, Spiral reinforcing bars are provided inside the first hollow overlapping hole, the second hollow overlapping hole, and the casting cavity.

7. An assembly method, characterized in that, Including the concrete modular composite structure as described in any one of claims 1-6, the assembly method includes the following steps: S1: Base construction, the base is reserved with the first hollow overlapping hole required for anchoring the steel bars of the vertical force-bearing splicing module into the foundation. The top of the base is leveled with cement mortar. The positioning control line for hoisting the first layer splicing module is marked on the top. Special shims are used to level it to the design elevation required for hoisting the first layer splicing module. S2: Use a special balance hanger to start hoisting the first-floor splicing module. When the splicing module falls to a vertical elevation of 500mm, align it with the hoisting positioning control line released from the top of the base, and slowly lower it. Check that the second hollow overlapping hole of the first-floor splicing module is aligned with the first hollow overlapping hole of the base. Then, slowly lower the splicing module to the base. Use a level and a vertical measuring ruler to check the flatness and verticality of the splicing module. After confirming that there are no errors, release the hook and remove the special balance hanger. S3: Install a steel cage in the second hollow overlapping hole of the first-layer splicing module and lower it into the first hollow overlapping hole of the base to ensure that the lapped steel cage is anchored into the foundation to meet the anchorage length and that the lap connection height with the vertical load-bearing steel cage of the first-layer splicing module meets the requirements. S4: Pour non-shrink concrete into the second hollow overlapping hole of the first-layer splicing module; S5: The top of the first-layer splicing module is leveled with cement mortar. The positioning control line for the hoisting of the second-layer splicing module is laid out on the top of the first-layer splicing module. Special shims are used to level it to the design elevation required for the hoisting of the second-layer splicing module. S6: Repeat steps 2-4 above to hoist the second-layer splicing module, install the steel cage in the second hollow overlapping hole of the second-layer splicing module, and pour non-shrink concrete in the second hollow overlapping hole of the second-layer splicing module. S7: Floors above the second floor shall be constructed in the same order as the second floor until the building is completed.

8. The assembly method as described in claim 7, characterized in that, In step S3, the lap length of the reinforcing cage is less than the length of the second hollow composite hole.

9. The assembly method as described in claim 7, characterized in that, In step S4, the top elevation of the non-shrink concrete is poured to the elevation of the lapped steel cage in the second hollow overlapping hole of the second-layer splicing module, which extends into the second hollow overlapping hole of the first-layer splicing module.

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