Modular building single-board splicing structure and construction method thereof

Abstract

The application provides a modular building single plate splicing structure, which comprises a prefabricated concrete bottom plate, multifaceted prefabricated concrete wall plates, a prefabricated concrete top plate, U-shaped closed stirrups, L-shaped steel bars, metal bellows, shear keys, ring-shaped steel bars, post-cast concrete and steel cages; the prefabricated concrete bottom plate is embedded with L-shaped steel bars, the left and right sides of the prefabricated concrete wall plates are embedded with U-shaped closed stirrups, and adjacent wall plates each extend a concrete thin plate to replace the later formwork after splicing; the upper and lower sides of the prefabricated concrete wall plates are embedded with shear key-metal bellows welded with shear keys. The application also discloses a construction method of the splicing structure. Through the connection node design of the standardized prefabricated wall plates, bottom plates and top plates, the application realizes the rapid and accurate assembly of the modular units, and the connection is reliable, simple and has high universality.

Description

Technical Field

[0001] This invention belongs to the field of modular building technology, and in particular relates to a modular building single-panel splicing structure and its construction method. Background Technology

[0002] Modular building is a highly integrated prefabricated assembly system that breaks down a building into modular units. The structure, interior decoration, plumbing, electrical systems, equipment piping, and bathroom facilities of each module are efficiently completed in the factory. Through reliable connection technologies, these modules are quickly assembled on-site to form a complete building, representing the most advanced green building method in terms of industrialization.

[0003] Current domestic research mainly focuses on connection nodes between containers, prefabricated shear walls, and modules, especially steel structure modular connection nodes. Research on connection nodes in concrete modular buildings is relatively limited. Therefore, further exploration of connection technologies and mechanical properties in modular buildings is needed to improve structural performance and achieve low-cost, lightweight goals.

[0004] Traditional modular construction often uses prefabricated modules for transportation, which results in problems such as large size, high transportation costs, and poor flexibility. In existing split-module splicing schemes, the connection between wall panels and floor slabs often relies on complex post-cast joints, leading to low construction efficiency and difficulty in controlling precision, resulting in problems such as low assembly efficiency, poor joint reliability, and complex joint connections.

[0005] Therefore, it is necessary to develop new modular building panel splicing technologies to overcome the above problems. Summary of the Invention

[0006] Purpose of the invention: To address the shortcomings and defects of existing technologies, this invention provides a modular building single-panel splicing structure and its construction method. Through the standardized design of connection nodes for prefabricated wall panels, bottom panels, and top panels, it enables rapid and precise assembly of modular units, ensuring reliable connections, simplicity, and strong versatility.

[0007] Technical Solution: The present invention provides a modular building single-panel splicing structure, characterized in that it includes a precast concrete base slab, multi-faceted precast concrete wall panels, a precast concrete top slab, U-shaped closed stirrups, L-shaped reinforcing bars, corrugated metal pipes, shear keys, ring reinforcing bars, post-cast concrete, and a reinforcing cage; the precast concrete base slab is pre-embedded with L-shaped reinforcing bars, and the precast concrete wall panels are pre-embedded with U-shaped closed stirrups on both sides, with each adjacent wall panel extending out of a thin concrete slab, which replaces the later formwork after assembly; the precast concrete wall panels are pre-embedded with shear keys—corrugated metal pipes—on both the upper and lower sides for welding shear keys.

[0008] The precast concrete base slab and precast concrete top slab are designed with flip-up panels. The precast concrete base slab or precast concrete top slab has a portion of concrete structure protruding at the splicing point with the precast concrete wall panel to form a cast-in-place wall panel structure. The splicing method between the precast concrete base slab or precast concrete top slab and the precast concrete wall panel is changed from splicing a horizontal slab with a vertical slab to splicing a vertical slab with a vertical slab.

[0009] The L-shaped steel bars extending from the precast concrete base slab are embedded in the lower layer of steel bars inside the precast concrete base slab. They are formed by the outward extension of the precast concrete base slab's own structural steel bars, and there is no need to tie the connecting steel bars.

[0010] The L-shaped reinforcing bars extending from the precast concrete base slab are not evenly distributed. They are densely distributed at the edge of the connection with the wall panel where the stress is unfavorable, and the ends of the reinforcing bars are blunted to increase the anchorage performance of the connection.

[0011] The precast concrete wall panels include a precast concrete front wall panel, a precast concrete door and window wall panel, a precast concrete rear wall panel, a precast concrete left wall panel, and a precast concrete right wall panel. Each wall panel has U-shaped closed stirrups formed by extending its own structural steel bars outward on both the left and right sides, with the outer edge of the wall panel extending outward from the concrete slab. Circular steel bars are embedded on the left side of the left wall and the right side of the right wall. Corrugated metal pipes with welded shear keys are embedded on the upper and lower sides of the precast concrete wall panel, with the positions of the embedded corrugated metal pipes directly opposite the L-shaped steel bars extending from the precast concrete base slab.

[0012] In this case, the upper layer of steel reinforcement mesh around the precast concrete top slab is not filled with concrete, and the reserved holes in the precast concrete top slab are located directly opposite the metal corrugated pipes with shear keys pre-embedded and welded in the precast concrete wall panels.

[0013] The precast concrete wall panel has metal corrugated pipes with welded shear keys embedded on the upper and lower sides. The shear keys are box-shaped steel plates with holes in the middle of the top and are welded to the edge of the metal corrugated pipes to form an integral whole. Concrete injection holes are provided around the perimeter, and the part of the shear keys extends beyond the edge of the concrete wall.

[0014] The precast concrete base slab or floor slab is provided with a stepped structure that is lower on the outside and higher on the inside for waterproofing purposes, and the precast concrete wall panel is provided with a corresponding stepped structure that is higher on the outside and lower on the inside for waterproofing purposes.

[0015] A construction method for a modular building panel splicing structure, characterized by comprising the following steps:

[0016] 1) Hoist the precast concrete wall panel to the precast concrete base slab. The L-shaped steel bars extending from the precast concrete base slab are inserted into the metal corrugated pipe with welded shear keys pre-embedded on the lower side of the precast concrete wall panel. After the support is completed, pour post-cast concrete into the metal corrugated pipe and the connection between the precast concrete base slab and the precast concrete wall panel to complete the consolidation.

[0017] 2) After the precast concrete base slab and the precast concrete wall panel are connected, the four walls of the precast concrete wall panel, namely the precast concrete door and window wall, the precast concrete rear wall, the precast concrete left wall, and the precast concrete right wall, need to be connected to each other through the U-shaped closed stirrups embedded on the left and right sides of each wall. Place the U-shaped closed stirrups at the corresponding positions on both sides of the wall, place the steel cage in the overlapping area of ​​the U-shaped closed stirrups, use the thin concrete slab as a template, and then pour the post-cast concrete at the connection of the wall to complete the consolidation.

[0018] 3) Hoist the precast concrete top slab to the corresponding position on the precast concrete wall panel. After placement, insert L-shaped steel bars into the pre-embedded metal corrugated pipe with shear keys on the upper side of the precast concrete wall panel and into the pre-reserved holes in the precast concrete top slab connected to it. Weld the upper side of the L-shaped steel bars to the upper layer of steel bars in the precast concrete top slab. Insert the vertical steel bars extending from the top of the door and window walls into the pre-reserved holes in the top slab. Pour the top slab-wall panel connection area with post-cast concrete to connect the entire module into one, completing the construction of the modular building single panel splicing.

[0019] Compared with the prior art, the present invention has the following significant advantages: the connection between the wall panel and the floor slab, and the connection between the wall panels, of the present invention solves the problems of low module assembly efficiency, poor node reliability, and complex node connection in the prior art through an efficient, reliable, and simple splicing method, and is suitable for industrialized rapid construction of residential modules.

[0020] This invention boasts the advantage of highly efficient assembly. Compared to existing traditional cast-in-place construction methods, the prefabrication of individual modules utilizes a single-panel splicing method. By subdividing the module units into building units such as wall panels and floor slabs, the splicing between these units reduces on-site adjustment time through standardized interfaces and pre-embedded guide components, forming complete modules and improving construction efficiency. Compared to other prefabrication construction methods, it offers simple and efficient connections while maintaining structural reliability. The shear strength of the U-shaped stirrup-reinforcing cage-grouting composite node is significantly improved compared to the mechanical properties of traditional prefabrication assembly methods. Compared to other complex splicing methods, this solution features highly versatile connection nodes, with interfaces for each prefabricated panel adaptable to multiple module combinations, reducing the complexity of component types. It truly achieves formwork savings, rapid construction, simple process, convenient and quick construction, and reduced costs. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the modular unit board splicing structure of the present invention;

[0022] Figure 2 This is a schematic diagram showing the disassembled modular unit board splicing structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the precast concrete base plate of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the precast concrete roof slab of the present invention;

[0025] Figure 5 This is a structural schematic diagram of the precast concrete front wall panel of the present invention;

[0026] Figure 6 This is a structural schematic diagram of the precast concrete door, window, and wall panel of the present invention;

[0027] Figure 7 This is a structural schematic diagram of the precast concrete rear wall panel of the present invention;

[0028] Figure 8 This is a structural schematic diagram of the precast concrete left side wall panel of the present invention;

[0029] Figure 9 This is a structural schematic diagram of the precast concrete right side wall panel of the present invention;

[0030] Figure 10 This is a structural schematic diagram of the connection node between the precast concrete base slab and the precast concrete wall panel of the present invention;

[0031] Figure 11 This is a structural schematic diagram of the connection node between precast concrete wall panels according to the present invention;

[0032] Figure 12 This is a structural schematic diagram of the connection node between the precast concrete roof slab and the precast concrete wall panel of the present invention;

[0033] Figure 13 This is a schematic diagram of the structure of the wall panel pre-embedded shear key-metal corrugated pipe of the present invention;

[0034] In the diagram, 1 represents the precast concrete base slab; 2 represents the precast concrete top slab; 3 represents the precast concrete front wall panel; 4 represents the precast concrete door and window wall panel; 5 represents the precast concrete rear wall panel; 6 represents the precast concrete left wall panel; 7 represents the precast concrete right wall panel; 1-1 represents the vertical reinforcing bars extending from the base slab; 1-2 represents the stepped waterproof structure; 1-3 represents the base slab flap; 2-1 represents the top layer reinforcing bars of the top slab; 2-2 represents the central concrete layer; 2-3 represents the pre-reserved reinforcing bar holes in the top slab; 2-4 represents the top slab flap; 3-1 represents the ring reinforcing bars; 3-2 represents the shear key - corrugated metal pipe; 4-1 represents the U-shaped closed stirrup; 4-2 represents the vertical reinforcing bars extending from the wall panel; 4-3 represents the concrete. Thin slab 1; 7-1 is the post-cast groove between modules; 10-1 is the structural reinforcement of the bottom slab; 10-2 is the shear key - metal corrugated pipe 2; 10-3 is the grouting layer 1; 10-4 is the shear key 1; 11-1 is the reinforcement cage; 11-2 is the U-shaped closed stirrup 2; 11-3 is the reserved hole in the wall panel; 11-4 is the concrete thin slab 2; 12-1 is the L-shaped reinforcement; 12-2 is the structural reinforcement of the top slab; 12-3 is the metal corrugated pipe 1; 12-4 is the grouting layer 2; 12-5 is the drip hole; 12-6 is the shear key 2; 13-1 is the metal corrugated pipe 2; 13-2 is the shear key 3; 13-3 is the grouting hole; 13-4 is the vertical inserted reinforcement. Detailed Implementation

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] The modular building panel splicing structure of this invention consists of precast concrete wall panels, precast concrete base slabs, and precast concrete top slabs. All component connection surfaces employ stepped interfaces to improve waterproofing. The structure comprises five precast concrete wall panels, a precast concrete top slab, U-shaped closed stirrups, L-shaped reinforcing bars, corrugated metal pipes, shear keys, ring reinforcing bars, and post-cast concrete, all positioned at different locations. The U-shaped closed stirrups are embedded on the left and right sides of the precast concrete wall panels. Adjacent wall panels extend out thinner sections of concrete wall for assembly, replacing the later formwork. Corrugated metal pipes are embedded on the upper and lower sides of the precast concrete wall panels, and ring reinforcing bars are embedded on the outer side of the precast concrete wall panels. The precast concrete base slab and precast concrete top slab are designed with flip-up panels. The precast concrete base slab or precast concrete top slab has a portion of concrete structure protruding at the splicing point with the precast concrete wall panel to form a cast-in-place wall panel structure. The splicing method between the precast concrete base slab or precast concrete top slab and the precast concrete wall panel is changed from splicing a horizontal slab with a vertical slab to splicing a vertical slab with a vertical slab.

[0037] The precast concrete base slab is reinforced with vertical steel bars that connect to each wall panel. The horizontal steel bars extending from each wall panel form U-shaped closed reinforcement. Thinner concrete sections extend from adjacent wall panels and are assembled to replace the later formwork. Holes for connection to the vertical steel bars and embedded corrugated metal pipes are pre-drilled on the top and bottom sides of the wall panels. During the precasting of the top slab, the central portion represents the actual height of the top slab, while the upper layer of steel bars protrudes around the perimeter for splicing the wall panels and top slab, with pre-drilled holes for inserting reinforcing bars. The connections between the wall panels and the base slab are all stepped. The precast concrete base slab and precast concrete wall panels are connected by L-shaped steel bars embedded in the base slab and corrugated metal pipes. Precast concrete wall panels are connected by U-shaped closed stirrups. Thin concrete slabs replace the later formwork. The precast concrete wall panels are connected by L-shaped steel bars and embedded corrugated metal pipes. The structural connections are solidified by post-cast concrete to form an integral structure.

[0038] The splicing between the precast concrete wall panel and the precast concrete base slab employs a grout-anchored reinforcement method. The base slab has pre-installed large-diameter connecting reinforcement bars extending from its underlying structural reinforcement. The ends of these bars are blunt-headed and inserted into pre-installed corrugated metal pipes with welded shear keys located beneath the wall panel. The splicing is completed after the pre-cast holes are poured. The precast concrete wall panel has pre-embedded corrugated metal pipes with welded shear keys on both the upper and lower sides. The shear keys are box-shaped steel plates with a central hole at the top, welded to the edge of the corrugated metal pipe to form a unified structure. Concrete grouting holes are provided around the perimeter, and the shear keys extend beyond the edge of the concrete wall.

[0039] When splicing precast concrete wall panels, two adjacent wall panels are placed in predetermined positions and connected at right angles. U-shaped reinforcing bars on both sides are overlapped and tied together. A reinforcing cage is then placed in, and a thin concrete slab replaces the later formwork, followed by grouting to complete the connection between the wall panels. When splicing precast concrete wall panels to precast concrete top slabs, the top slab is hoisted to the appropriate position. The insertion holes of the top slab are connected to the corrugated metal pipes of the wall panel. L-shaped reinforcing bars are inserted into the pre-drilled holes, with the upper horizontal portion of the reinforcing bars parallel to the upper layer of reinforcing bars in the top slab. After insertion, the L-shaped reinforcing bars are welded to the upper layer of reinforcing bars. Finally, the pre-drilled holes and the upper layer of the top slab are poured to complete the splicing. During the splicing of each precast panel, post-cast concrete is poured at all connection nodes to achieve overall consolidation and form a continuous load-bearing system.

[0040] In this invention, U-shaped closed stirrups are embedded on the left and right sides of the precast concrete wall panel, and metal corrugated pipes with welded shear keys are embedded on the upper and lower sides of the precast concrete wall panel. Ring-shaped reinforcing bars are embedded on the outer side of the precast concrete wall panel. The precast concrete base slab and the precast concrete wall panel are connected by L-shaped reinforcing bars embedded in the precast concrete base slab and metal corrugated pipes with welded shear keys. The precast concrete wall panels are connected by U-shaped closed stirrups. Adjacent wall panels extend thinner concrete sections, which are then assembled to replace the later formwork. Reinforcing cages are placed at the overlapping points of the U-shaped reinforcing bars to strengthen the connection. The precast concrete wall panels are connected by L-shaped reinforcing bars and metal corrugated pipes with welded shear keys embedded in the precast concrete wall panels. The structural connections are solidified by post-cast concrete to form an integral structure.

[0041] The construction method of the modular building panel splicing structure of the present invention adopts a graded assembly construction process during construction:

[0042] 1) First, position the base plate and wall panel: Align the bottom metal corrugated pipe of the wall panel with the vertical steel bar extending from the base plate and insert it, then grout thoroughly.

[0043] 2) Then comes the horizontal splicing of wall panels: the U-shaped closed stirrups of adjacent wall panels are aligned and placed into the steel cage, and the thin concrete slab replaces the later formwork and is then grouted for fixation.

[0044] 3) Finally, the top slab is installed: the horizontal section of the L-shaped steel bar is welded to the exposed steel bar of the top slab, and the vertical section is inserted into the corrugated pipe of the wall panel and fixed by grouting.

[0045] Example:

[0046] like Figure 1 and Figure 2 In this embodiment, the precast concrete module unit is composed of seven concrete slabs: a precast concrete base slab 1, a precast concrete top slab 2, a precast concrete front wall slab 3, a precast concrete door and window wall slab 4, a precast concrete rear wall slab 5, a precast concrete left wall slab 6, and a precast concrete right wall slab 7.

[0047] like Figure 3 The precast concrete base slab 1 has pre-embedded large-diameter vertical reinforcing bars 1-1, which are formed by the outward extension of the internal structural reinforcing bars of the base slab. The ends of the reinforcing bars are blunt-headed. The connection between the wall panels and the base slab is made into a stepped waterproof structure 1-2 with the outside lower than the inside. The precast concrete base slab 1 is a flip-plate structure with a base slab flip plate 1-3.

[0048] like Figure 4The upper central area of ​​the precast concrete roof slab 2 is a central concrete layer 2-2. Except for the central concrete layer 2-2, the reinforcing bars 2-1 of the upper layer of the roof slab are exposed around the perimeter during roof slab production and are not poured with concrete; these are used for connection to the wall panels. The precast concrete roof slab 2 has a flap structure and is equipped with a roof flap 2-4. The precast concrete roof slab 2 has pre-reserved reinforcing bar insertion holes 2-3.

[0049] like Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 Precast wall panels are divided into precast concrete front wall panel 3, precast concrete door and window wall panel 4, precast concrete rear wall panel 5, precast concrete left wall panel 6, and precast concrete right wall panel 7 according to their assembly positions. Among them, U-shaped closed stirrups 4-1 are embedded on both sides of each of the precast concrete door and window wall panel 4, precast concrete rear wall panel 5, precast concrete left wall panel 6, and precast concrete right wall panel 7, which are formed by extending outward from their own structural steel bars. Shear keys - metal corrugated pipes 10-2 are embedded on the upper and lower sides of the precast concrete front wall panel 3, precast concrete door and window wall panel 4, precast concrete rear wall panel 5, precast concrete left wall panel 6, and precast concrete right wall panel 7, respectively, and their positions correspond to the vertically extended steel bars 1-1 of the bottom slab and the reserved holes in the top slab.

[0050] The precast concrete front wall panel 3 is equipped with ring reinforcement 3-1 and shear key-metal corrugated pipe 3-2. The precast concrete door and window wall panel 4 is equipped with U-shaped closed stirrup 4-1, vertically extending wall panel reinforcement 4-2, and thin concrete slab 4-3. The precast concrete rear wall panel 5 is equipped with U-shaped closed stirrup 4-1, shear key-metal corrugated pipe 3-2, and thin concrete slab 4-3. The precast concrete left wall panel 6 is equipped with U-shaped closed stirrup 4-1, shear key-metal corrugated pipe 3-2, and thin concrete slab 4-3. The precast concrete right wall panel 7 is equipped with ring reinforcement 3-1 and inter-module pouring groove 7-1.

[0051] like Figure 10 When the precast concrete base slab 1 is vertically connected to the precast concrete front wall panel 3, the precast concrete door and window wall panel 4, the precast concrete rear wall panel 5, the precast concrete left wall panel 6, and the precast concrete right wall panel 7, the precast wall panels are hoisted to the corresponding positions of the large-diameter vertical connecting steel bars 1-1 embedded in the base slab. The large-diameter vertical connecting steel bars 1-1 embedded in the base slab are inserted into the shear key - metal corrugated pipe II 10-2 on the lower side of the wall panel. After being supported and fixed, post-cast concrete is poured into the corrugated pipe and the connection between the base slab and the wall panel to form an integral consolidation.

[0052] The connection nodes between the precast concrete base slab 1 and the precast concrete wall slab include the base slab structural reinforcement 10-1, shear key - metal corrugated pipe 2 10-2, grouting layer 1 10-3, and shear key 1 10-4.

[0053] like Figure 11 When horizontally connecting precast concrete wall panels, adjacent wall panels are aligned and interlocked using U-shaped closed stirrups 11-2. After binding, a reinforcing cage 11-1 is placed in the overlapping area of ​​the U-shaped closed stirrups 11-2 to enhance the shear resistance of the joint. Then, a thin concrete slab 11-4 replaces the later-cast concrete after the formwork is erected. Horizontal connections of precast concrete wall panels are only made between the four wall panels: precast concrete door and window wall panel 4, precast concrete rear wall panel 5, precast concrete left wall panel 6, and precast concrete right wall panel 7. The precast concrete wall panels have pre-reserved holes 11-3.

[0054] like Figure 12 When vertically connecting the precast concrete base slab 2 to the precast concrete front wall panel 3, precast concrete door and window wall panel 4, precast concrete rear wall panel 5, precast concrete left wall panel 6, and precast concrete right wall panel 7, the precast concrete base slab 2 is hoisted above the precast concrete wall panels. The pre-reserved insertion holes 2-3 in the top slab are aligned with the upper metal corrugated pipe 12-3 on the wall panel. After hoisting to the corresponding position, L-shaped steel bars 12-1 are inserted into the metal corrugated pipe 12-3. The horizontal section of the L-shaped steel bar 12-1 is welded to the upper layer steel bar 2-1 of the top slab, and the vertical section is inserted into the corrugated pipe. After the steel bars are inserted, concrete is poured. Post-cast concrete is poured at the connection between the top slab and the wall panels to form a continuous load-bearing system.

[0055] The connection nodes between the precast concrete roof slab 2 and the precast concrete wall slab include L-shaped steel bars 12-1, roof slab structural steel bars 12-2, metal corrugated pipe 12-3, grouting layer 2 12-4, drip hole 12-5, and shear key 2 12-6.

[0056] like Figure 13 The wall panel pre-embedded shear key - metal corrugated pipe includes metal corrugated pipe 2 13-1, shear key 3 13-2, grouting hole 13-3, and vertical inserted steel bar 13-4.

[0057] During post-cast concrete construction, all connection joints are filled with post-cast concrete to ensure the overall structural rigidity. Simultaneously, the strength grade of the post-cast concrete is no lower than that of the precast component concrete. Standardized precast wall panels, floor slabs, roof slabs, and specialized connecting components (U-shaped closed stirrups, L-shaped reinforcing bars, corrugated metal pipes, etc.) enable rapid and precise assembly of modular units to form the overall structure. The construction process adopts a bottom-up, graded assembly mode, combined with a stepped waterproof interface design, solving the problems of low efficiency and poor joint reliability in traditional modular assembly.

[0058] The connection between wall panels and floor slabs, and between wall panels, of the present invention solves the problems of low module assembly efficiency, poor node reliability, and complex node connection in the prior art through an efficient, reliable, and simple splicing method, and is suitable for industrialized rapid construction of residential modules.

[0059] This invention boasts the advantage of highly efficient assembly. Compared to existing traditional cast-in-place construction methods, the prefabrication of individual modules utilizes a single-panel splicing method. By subdividing the module units into building units such as wall panels and floor slabs, the splicing between these units reduces on-site adjustment time through standardized interfaces and pre-embedded guide components, forming complete modules and improving construction efficiency. Compared to other prefabrication construction methods, it offers simple and efficient connections while maintaining structural reliability. The shear strength of the U-shaped stirrup-reinforcing cage-grouting composite node is significantly improved compared to the mechanical properties of traditional prefabrication assembly methods. Compared to other complex splicing methods, this solution features highly versatile connection nodes, with interfaces for each prefabricated panel adaptable to multiple module combinations, reducing the complexity of component types. It truly achieves formwork savings, rapid construction, simple process, convenient and quick construction, and reduced costs.

Claims

1. A modular building panel splicing structure, characterized in that: The system includes a precast concrete base slab, multi-faceted precast concrete wall panels, a precast concrete roof slab, U-shaped closed stirrups, L-shaped reinforcing bars, corrugated metal pipes, shear keys, ring reinforcing bars, post-cast concrete, and a reinforcing cage. The precast concrete base slab has embedded L-shaped reinforcing bars, and the precast concrete wall panels have embedded U-shaped closed stirrups on both sides. Adjacent wall panels extend beyond the concrete slab, replacing the later formwork after assembly. The precast concrete wall panels have embedded corrugated metal pipes with welded shear keys on both the top and bottom sides. The precast concrete base slab and precast concrete roof slab are designed with flip-up panels, with a portion of the precast concrete extending from the joint with the precast concrete wall panels to form a cast-in-place wall panel structure. The precast concrete base slab or precast concrete roof slab... The splicing method between the slab and the precast concrete wall panel is changed from splicing horizontal slabs and vertical slabs to splicing vertical slabs and vertical slabs. The precast concrete wall panel has metal corrugated pipes with welded shear keys embedded on its upper and lower sides. The shear keys are box-shaped steel plates with a hole in the center of the top, welded to the edge of the metal corrugated pipe to form a whole. Concrete grouting holes are provided around the perimeter, and the shear keys extend beyond the edge of the concrete wall. The positions of the embedded metal corrugated pipes on the upper and lower sides of the precast concrete wall panel are directly opposite the L-shaped reinforcing bars extending from the precast concrete base slab. The upper layer of reinforcing bars in the precast concrete top slab has a reinforcing mesh around it that is not filled with concrete, and the positions of the reserved holes in the precast concrete top slab are directly opposite the embedded metal corrugated pipes with welded shear keys in the precast concrete wall panel.

2. The modular building panel splicing structure according to claim 1, characterized in that: The L-shaped steel bars extending from the precast concrete base slab are embedded in the lower layer of steel bars inside the precast concrete base slab. They are formed by the outward extension of the precast concrete base slab's own structural steel bars, and there is no need to tie the connecting steel bars.

3. The modular building panel splicing structure according to claim 2, characterized in that: The L-shaped reinforcing bars extending from the precast concrete base slab are not evenly distributed. They are densely distributed at the edge of the connection with the wall panel where the stress is unfavorable, and the ends of the reinforcing bars are blunted to increase the anchorage performance of the connection.

4. The modular building panel splicing structure according to claim 1, characterized in that: The precast concrete wall panels include a precast concrete front wall panel, a precast concrete door and window wall panel, a precast concrete rear wall panel, a precast concrete left wall panel, and a precast concrete right wall panel. Each wall panel has U-shaped closed stirrups formed by extending its own structural steel bars outward on both the left and right sides, with the concrete slab extending outward from the outer edge of the wall. Circular steel bars are embedded on the left side of the left wall and the right side of the right wall. Corrugated metal pipes with welded shear keys are embedded on the upper and lower sides of the precast concrete wall panel, with the positions of the embedded corrugated metal pipes directly opposite the L-shaped steel bars extending from the precast concrete base slab.

5. The modular building panel splicing structure according to claim 1, characterized in that: The precast concrete base slab or floor slab is provided with a stepped structure that is lower on the outside and higher on the inside for waterproofing purposes, and the precast concrete wall panel is provided with a corresponding stepped structure that is higher on the outside and lower on the inside for waterproofing purposes.

6. The construction method of the modular building single-panel splicing structure according to claim 4, characterized in that: Includes the following steps: 1) Hoist the precast concrete wall panel to the precast concrete base slab. The L-shaped steel bars extending from the precast concrete base slab are inserted into the metal corrugated pipe with welded shear keys pre-embedded on the lower side of the precast concrete wall panel. After the support is completed, pour post-cast concrete into the metal corrugated pipe and the connection between the precast concrete base slab and the precast concrete wall panel to complete the consolidation. 2) After the precast concrete base slab and the precast concrete wall panel are connected, the four walls of the precast concrete wall panel, namely the precast concrete door and window wall, the precast concrete rear wall, the precast concrete left wall, and the precast concrete right wall, need to be connected to each other through the U-shaped closed stirrups embedded on the left and right sides of each wall. Place the U-shaped closed stirrups at the corresponding positions on both sides of the wall, place the steel cage in the overlapping area of ​​the U-shaped closed stirrups, use the thin concrete slab as a template, and then pour the post-cast concrete at the connection of the wall to complete the consolidation. 3) Hoist the precast concrete top slab to the corresponding position on the precast concrete wall panel. After placement, insert L-shaped steel bars into the pre-embedded metal corrugated pipe with shear keys on the upper side of the precast concrete wall panel and into the pre-reserved holes in the precast concrete top slab connected to it. Weld the upper side of the L-shaped steel bars to the upper layer of steel bars in the precast concrete top slab. Insert the vertical steel bars extending from the top of the door and window walls into the pre-reserved holes in the top slab. Pour the top slab-wall panel connection area with post-cast concrete to connect the entire module into one, completing the construction of the modular building single panel splicing.

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