Modularized building veneer splicing structure and construction method thereof

Abstract

The invention provides a modular building veneer splicing structure. The modular building veneer splicing structure comprises a prefabricated concrete bottom plate, a multi-face prefabricated concrete wall plate, a prefabricated concrete top plate, U-shaped closed stirrups, L-shaped steel bars, metal corrugated pipes, shear keys, annular steel bars, post-pouring concrete and a steel reinforcement cage. L-shaped steel bars are pre-buried in the prefabricated concrete bottom plate, U-shaped closed stirrups are pre-buried in the left side and the right side of the prefabricated concrete wall plate, concrete thin plates extend out of the adjacent wall plates, and later-period formwork erecting is replaced after assembly; shear key-metal corrugated pipes welded with shear keys are embedded in the upper side and the lower side of the prefabricated concrete wallboard. The invention further discloses a construction method of the splicing structure. Through the design of connecting joints of the standardized prefabricated wall plates, the bottom plate and the top plate, rapid and accurate assembly of the module units is achieved, connection is reliable, simple and convenient, and universality is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of modular buildings, and in particular relates to a modular building single-board splicing structure and a construction method thereof. Background Art

[0002] Modular construction is a highly integrated prefabricated assembly system that breaks down buildings into modular units. The structural, finishes, plumbing, equipment, and bathroom facilities are all efficiently completed in the factory. Using reliable connection technology, these modules can be quickly assembled on-site to form a complete building. Currently, this represents the most industrialized and green construction method.

[0003] Current research in China focuses primarily on the connection nodes between containers, prefabricated shear walls, and modules, particularly in modular steel structures. Studies on connection nodes in concrete modular buildings are relatively limited. Therefore, further research is needed to explore the connection technologies and mechanical properties of modular buildings to improve structural performance and achieve low cost and lightweight construction.

[0004] Traditional modular buildings often use prefabricated modules for transportation, which presents challenges such as bulk, high transportation costs, and limited flexibility. Existing split-module assembly solutions often rely on complex post-cast joints to connect wall panels and floor slabs, resulting in low construction efficiency and difficulty in controlling precision. This leads to low assembly efficiency, poor joint reliability, and complex joint connections.

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

[0006] Purpose of the invention: In view of the shortcomings and defects of the existing technology, the present invention provides a modular building single-panel splicing structure and a construction method thereof. Through the connection node design of standardized prefabricated wall panels, bottom plates, and top plates, the modular units can be assembled quickly and accurately, with reliable, simple and versatile connections.

[0007] Technical solution: A modular building single-panel splicing structure of the present invention is characterized by comprising a precast concrete base plate, multi-sided precast concrete wall panels, a precast concrete top plate, U-shaped closed stirrups, L-shaped steel bars, metal bellows, shear keys, circular steel bars, post-cast concrete, and a steel cage; the precast concrete base plate is pre-embedded with L-shaped steel bars, the left and right sides of the precast concrete wall panels are pre-embedded with U-shaped closed stirrups, adjacent wall panels each extend out of a concrete thin plate, and after assembly, they replace the later formwork; the upper and lower sides of the precast concrete wall panels are pre-embedded with shear keys-metal bellows with welded shear keys.

[0008] Among them, the precast concrete bottom plate and precast concrete top plate are of flip-up design, and part of the concrete structure of the precast concrete bottom plate or precast concrete top plate extends out at the splicing position with the precast concrete wall panel to form a cast-in-place wall panel structure; the splicing method of the precast concrete bottom plate or precast concrete top plate with the precast concrete wall panel is changed from the splicing of horizontal plates and vertical plates to the splicing of vertical plates and vertical plates.

[0009] The L-shaped steel bars extending from the precast concrete base plate are embedded in the lower steel bars inside the precast concrete base plate. The L-shaped steel bars are formed by the structural steel bars of the precast concrete base plate extending outward, and no further connection steel bars need to be tied.

[0010] Among them, the L-shaped steel bars extending from the precast concrete base plate are not evenly distributed. The steel bars are densely distributed at the edge of the connection part with the wall panel where the force is unfavorable, and the ends of the steel bars are blunted to increase the anchoring performance of the connection.

[0011] Among them, the precast concrete wall panels include precast concrete front wall panels, precast concrete door and window wall panels, precast concrete rear wall panels, precast concrete left wall panels, and precast concrete right wall panels; the left and right sides of each wall panel are pre-embedded with U-shaped closed stirrups formed by extending the structural steel bars outward, and a thin concrete plate extends out from the outer edge of the wall; the left side of the left wall and the right side of the right wall are pre-embedded with circular steel bars; the upper and lower sides of the precast concrete wall panels are pre-embedded with metal corrugated pipes welded with shear keys, and the positions of the upper and lower embedded metal corrugated pipes are exactly opposite to the L-shaped steel bars extending from the precast concrete bottom plate.

[0012] Wherein, the steel mesh around the upper steel bars of the precast concrete top plate is not poured with concrete, and the reserved holes in the precast concrete top plate are positioned just opposite to the precast concrete wall panels where the metal corrugated pipes with shear keys are embedded and welded.

[0013] Among them, the precast concrete wall panels are embedded with metal bellows with shear keys welded on the upper and lower sides of the wall. The shear keys are box-shaped steel plates with a hole in the middle of the top, and are welded to the edge of the metal bellows to form a whole. Concrete grouting holes are provided around them, and the shear key part exceeds the edge of the concrete wall.

[0014] The precast concrete bottom plate or floor plate is provided with a stepped structure with a low outside and a high inside for waterproofing, and the lower side of the precast concrete wall plate is provided with a corresponding stepped structure with a high outside and a low inside for waterproofing.

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

[0016] 1) The precast concrete wall panels are hoisted and placed on the precast concrete base plate. The L-shaped steel bars extending from the precast concrete base plate are inserted into the metal corrugated pipes with shear keys embedded in the lower side of the precast concrete wall panels. After the support is completed, the post-cast concrete is poured into the connection between the metal corrugated pipes and the precast concrete base plate and the precast concrete wall panels to complete the consolidation.

[0017] 2) After the precast concrete base plate 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 side wall, the precast concrete left wall, and the precast concrete right wall, need to be connected by pre-embedded U-shaped closed stirrups on the left and right sides of each wall. The U-shaped closed stirrups at the corresponding positions of the two side walls are placed in the corresponding positions, and a steel cage is placed in the overlapping area of the U-shaped closed stirrups. The concrete thin plate is used as a formwork, and then the post-cast concrete is poured into the connection of the wall to complete the consolidation.

[0018] 3) The precast concrete top plate is hoisted and placed to the corresponding position on the precast concrete wall panel. After placement, L-shaped steel bars are inserted into the metal corrugated pipe with shear keys embedded on the upper side of the precast concrete wall panel and the reserved holes of the precast concrete top plate connected to it. The upper side of the L-shaped steel bar is welded to the upper steel bar of the precast concrete top plate. The vertical steel bars extending above the door and window wall are inserted into the reserved holes of the top plate. The top plate-wall panel connection area is poured with post-poured concrete to connect the entire module into one, completing the construction of modular building single panel splicing.

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

[0020] The present invention has the advantage of efficient assembly. Compared with the existing traditional cast-in-place construction scheme, the prefabrication of a single module adopts a single-plate splicing method. By subdividing the module units into building units such as wall panels and floor panels, the splicing between the building units is reduced through standardized interfaces and embedded guide components to reduce on-site adjustment time, forming a complete module and improving construction efficiency. Compared with other prefabricated construction schemes, it has simple and efficient connections while also having structural reliability. The shear strength of the U-shaped stirrup-rebar cage-grouting composite node is greatly improved compared to the mechanical properties of traditional prefabricated assembly schemes; compared with other complex splicing schemes, the connection nodes of this scheme are highly versatile, and the interfaces of each prefabricated plate are adapted to multiple module combinations, reducing the complexity of component types. It truly saves templates, quickly constructs, has a simple process, is convenient and quick to construct, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0024] Figure 4 It is a structural schematic diagram of the precast concrete top plate of the present invention;

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

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

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

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

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

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

[0031] Figure 11 A schematic structural diagram of connection nodes between precast concrete wall panels of the present invention;

[0032] Figure 12 This is a schematic structural diagram of the connection nodes between the precast concrete top plate and the precast concrete wall plate of the present invention;

[0033] Figure 13 This is a structural diagram of the wall panel pre-embedded shear key-metal bellows of the present invention;

[0034] In the figure, 1 is a precast concrete bottom plate; 2 is a precast concrete top plate; 3 is a precast concrete front wall plate; 4 is a precast concrete door and window wall plate; 5 is a precast concrete rear wall plate; 6 is a precast concrete left wall plate; 7 is a precast concrete right wall plate; 1-1 is a vertically extending steel bar from the bottom plate; 1-2 is a stepped waterproof structure; 1-3 is a bottom plate flap; 2-1 is an upper steel bar of the top plate; 2-2 is a central concrete layer; 2-3 is a reserved dowel hole for the top plate; 2-4 is a top plate flap; 3-1 is a ring steel bar; 3-2 is a shear key - a metal corrugated pipe; 4-1 is a U-shaped closed stirrup; 4-2 is a vertically extending steel bar from the wall plate; 4-3 is a concrete Thin plate one; 7-1 is the post-cast groove between modules; 10-1 is the bottom plate structural reinforcement; 10-2 is the shear key - metal bellows two; 10-3 is the mortar layer one; 10-4 is the shear key one; 11-1 is the steel cage; 11-2 is the U-shaped closed stirrup two; 11-3 is the reserved hole for the wall panel; 11-4 is the concrete thin plate two; 12-1 is the L-shaped steel bar; 12-2 is the top plate structural reinforcement; 12-3 is the metal bellows one; 12-4 is the mortar layer two; 12-5 is the drip hole; 12-6 is the shear key two; 13-1 is the metal bellows two; 13-2 is the shear key three; 13-3 is the grouting hole; 13-4 is the vertically inserted steel bar. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0036] The modular building single-panel splicing structure of the present invention is composed of precast concrete wall panels, precast concrete bottom panels, and precast concrete top panels. The connection surfaces of each component adopt stepped interfaces to improve waterproof performance. Five precast concrete wall panels, precast concrete top panels, U-shaped closed stirrups, L-shaped steel bars, metal bellows, shear keys, annular steel bars, and post-cast concrete are located in different positions. The U-shaped closed stirrups are embedded in the left and right sides of the precast concrete wall panels. The adjacent wall panels extend out of the thinner concrete wall to replace the later formwork after assembly. The metal bellows are embedded in the upper and lower sides of the precast concrete wall panels, and the annular steel bars are embedded in the outer sides of the precast concrete wall panels. The precast concrete bottom plate and the precast concrete top plate are of a flip-up design, and part of the concrete structure of the precast concrete bottom plate or the precast concrete top plate extends out from the joint with the precast concrete wall panel to form a cast-in-place wall panel structure; the splicing method of the precast concrete bottom plate or the precast concrete top plate with the precast concrete wall panel is changed from the splicing of horizontal plates and vertical plates to the splicing of vertical plates and vertical plates.

[0037] The precast concrete base slab is embedded with vertical rebar to connect to the wall panels. Transverse rebar extending from each wall panel forms a U-shaped closed reinforcement. Adjacent wall panels extend from thinner concrete walls, replacing later formwork. Holes for connecting the vertical rebar and embedded metal corrugated pipes are reserved on the upper and lower sides of the wall panels. During precast construction, the center portion of the top slab is solid, with upper rebar exposed around the perimeter for joining the wall panels and top slabs. Rebar holes are also reserved. The joints between the wall panels and base slab are designed as stepped connections. The precast concrete base slab is connected to the precast concrete wall panels using L-shaped rebar and metal corrugated pipe embedded in the precast concrete base slab. Precast concrete wall panels are connected to each other using U-shaped closed stirrups. Thin concrete slabs replace later formwork. Precast concrete wall panels are connected to each other using L-shaped rebar and metal corrugated pipe embedded in the precast concrete wall panels. Structural joints are consolidated with post-cast concrete to form a monolithic structure.

[0038] The precast concrete wall panels and precast concrete base slabs are joined using grout-anchored rebar. The base slabs are equipped with large-diameter connecting rebar extending from the underlying structural reinforcement. The rebar ends are blunted and inserted into a metal bellows welded with shear keys, pre-reserved beneath the wall panels. The joint is then completed by post-casting the pre-reserved holes. The precast concrete wall panels are embedded with metal bellows welded with shear keys on the top and bottom sides. The shear keys are box-shaped steel plates with a hole in the center of the top. These are welded to the edges of the metal bellows to form a single piece. 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 a predetermined position. Two adjacent walls are connected at right angles. U-shaped bars on both sides are overlapped and tied together. Then, a steel cage is placed. A thin concrete slab replaces the later formwork and grouting is performed to complete the connection between the wall panels. When splicing precast concrete wall panels with precast concrete top slabs, the top slab is hoisted to the corresponding position. The top slab's reinforcement holes are connected to the wall panel's metal bellows. L-shaped steel bars are inserted into the reserved holes. The upper horizontal portion of the steel bars is parallel to the upper layer of steel bars in the top slab. After the reinforcement is inserted, the L-shaped steel bars are welded to the upper layer of steel bars. Finally, the reserved holes and the upper layer of the top slab are poured to complete the splicing. When splicing each precast panel, post-cast concrete is poured at all connection nodes to achieve overall consolidation and form a continuous load-bearing system.

[0040] The present invention pre-embeds U-shaped closed stirrups on the left and right sides of the precast concrete wall panels, welded metal bellows with shear keys are pre-embedded on the top and bottom sides of the precast concrete wall panels, and annular steel bars are pre-embedded on the outside of the precast concrete wall panels. The precast concrete base panels are connected to each other via L-shaped steel bars pre-embedded in the precast concrete base panels and the welded metal bellows with shear keys. The precast concrete wall panels are connected to each other via U-shaped closed stirrups. Adjacent wall panels extend from thinner concrete walls and are assembled to replace later formwork. Steel cages are placed at the overlapping points of the U-shaped bars to strengthen the connection. The precast concrete wall panels are connected to each other via L-shaped steel bars and the welded metal bellows with shear keys pre-embedded in the precast concrete wall panels. Concrete is then poured later to consolidate the structural joints, forming a monolithic structure.

[0041] The construction method of the modular building single-board splicing structure of the present invention adopts a hierarchical assembly construction process during construction:

[0042] 1) First, position the bottom plate and wall panel: align the metal corrugated pipe at the bottom of the wall panel with the vertical steel bars extending from the bottom plate and insert them, then fill them with grout.

[0043] 2) Then the wall panels are horizontally spliced: U-shaped closed stirrups of adjacent wall panels are aligned and placed in steel cages, and thin concrete slabs replace the later vertical formwork and are then fixed by grouting.

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

[0045] Example:

[0046] like Figure 1 and Figure 2 The precast concrete module unit of this embodiment is composed of a total of 7 concrete panels, namely, a precast concrete bottom plate 1, a precast concrete top plate 2, a precast concrete front wall panel 3, a precast concrete door and window wall panel 4, a precast concrete rear wall panel 5, a precast concrete left wall panel 6, and a precast concrete right wall panel 7.

[0047] like Figure 3 The precast concrete floor 1 has pre-embedded, large-diameter vertically extending steel bars 1-1, formed by extending the internal structural steel bars outward. The ends of the steel bars are blunted. The joints between the wall panels and the floor are formed into a stepped waterproof structure 1-2, with a lower outer layer and a higher inner layer. The precast concrete floor 1 is a flap structure with a floor flap 1-3.

[0048] like Figure 4The upper center area of the precast concrete top slab 2 is the central concrete layer 2-2. Except for the central concrete layer 2-2, the surrounding reinforcement 2-1 is exposed during the top slab production process, without concrete being poured. This serves as a connection to the wall panels. The precast concrete top slab 2 is a flap structure with a top slab flap 2-4. Precast concrete top slab 2 is provided with pre-reinforcement 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 panels 3, precast concrete door and window wall panels 4, precast concrete rear wall panels 5, precast concrete left wall panels 6, and precast concrete right wall panels 7 according to different assembly positions. Among them, the precast concrete door and window wall panels 4, precast concrete rear wall panels 5, precast concrete left wall panels 6, and precast concrete right wall panels 7 are pre-embedded with U-shaped closed stirrups 4-1 on the left and right sides of each wall, which are formed by extending the structural steel bars outward; the precast concrete front wall panels 3, precast concrete door and window wall panels 4, precast concrete rear wall panels 5, precast concrete left wall panels 6, and precast concrete right wall panels 7 are pre-embedded with shear keys - metal corrugated pipes 10-2 on the upper and lower sides of the wall, and their positions correspond to the vertically protruding steel bars 1-1 of the bottom plate and the reserved holes in the top plate.

[0050] The precast concrete front wall panel 3 is equipped with circular reinforcement 3-1 and a shear key-metal bellows 3-2. The precast concrete door and window wall panel 4 is equipped with U-shaped closed stirrups 4-1, vertically extending steel bars 4-2, and a concrete sheet 4-3. The precast concrete rear wall panel 5 is equipped with U-shaped closed stirrups 4-1, a shear key-metal bellows 3-2, and a concrete sheet 4-3. The precast concrete left wall panel 6 is equipped with U-shaped closed stirrups 4-1, a shear key-metal bellows 3-2, and a concrete sheet 4-3. The precast concrete right wall panel 7 is equipped with circular reinforcement 3-1 and a post-cast trough 7-1 between modules.

[0051] like Figure 10 When the precast concrete bottom plate 1 is vertically connected with 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 panel is hoisted to the corresponding position of the large-diameter bottom plate vertical connecting steel bar 1-1 embedded in the bottom plate, and the large-diameter bottom plate vertical connecting steel bar 1-1 embedded in the bottom plate is inserted into the shear key-metal corrugated pipe 10-2 on the lower side of the wall panel. After support and fixation, pour post-cast concrete into the corrugated pipe and the bottom plate-wall panel connection to form overall consolidation.

[0052] The connection node between the precast concrete base plate 1 and the precast concrete wall panel includes the base plate structural steel bar 10-1, the shear key - metal corrugated pipe 10-2, the mortar layer 10-3, and the shear key 10-4.

[0053] like Figure 11 When precast concrete wall panels are horizontally connected, adjacent panels are joined using U-shaped closed stirrups 11-2. After tying, a steel cage 11-1 is placed in the overlapping area of the U-shaped closed stirrups 11-2 to enhance the joint's shear resistance. Concrete slabs 11-4 then replace the post-cast concrete after erecting the formwork. Horizontal connections are only made between the four precast concrete wall panels: the precast concrete door and window panel 4, the precast concrete rear wall panel 5, the precast concrete left wall panel 6, and the precast concrete right wall panel 7. Pre-reserved holes 11-3 are provided in the precast concrete wall panels.

[0054] like Figure 12 When vertically connecting the precast concrete base plate 2 with 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 plate 2 is hoisted above the precast concrete wall panel. The reserved rebar holes 2-3 in the top plate are aligned with the metal corrugated pipe 12-3 on the upper side of the wall panel. After hoisting to the corresponding position, L-shaped rebar 12-1 is inserted into the metal corrugated pipe 12-3. The horizontal section of L-shaped rebar 12-1 is welded to the upper rebar 2-1 of the top plate, and the vertical section is inserted into the corrugated pipe. After the rebar is inserted, concrete is poured. Post-cast concrete is poured around the connection between the top plate and the wall panels to form a continuous load-bearing system.

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

[0056] like Figure 13 The wall panel embedded shear key - metal bellows includes a metal bellows 2 13-1, a shear key 3 13-2, a grouting hole 13-3, and a vertically inserted steel bar 13-4.

[0057] During post-cast concrete construction, all connection nodes are filled with post-cast concrete to ensure overall structural rigidity. At the same time, the strength grade of the post-cast concrete is no less than that of the precast concrete. Standardized precast wall panels, base plates, roof plates, and specialized connection components (U-shaped closed stirrups, L-shaped steel bars, metal bellows, etc.) enable rapid and precise assembly of modular units to form the overall structure. The construction process utilizes a "bottom-up" hierarchical assembly model, combined with a stepped waterproof joint design, to address the low efficiency and poor joint reliability of traditional modular assembly.

[0058] The connection between the wall panels and the floor panels, 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 the industrialized rapid construction of residential modules.

[0059] The present invention has the advantage of efficient assembly. Compared with the existing traditional cast-in-place construction scheme, the prefabrication of a single module adopts a single-plate splicing method. By subdividing the module units into building units such as wall panels and floor panels, the splicing between the building units is reduced through standardized interfaces and embedded guide components to reduce on-site adjustment time, forming a complete module and improving construction efficiency. Compared with other prefabricated construction schemes, it has simple and efficient connections while also having structural reliability. The shear strength of the U-shaped stirrup-rebar cage-grouting composite node is greatly improved compared to the mechanical properties of traditional prefabricated assembly schemes; compared with other complex splicing schemes, the connection nodes of this scheme are highly versatile, and the interfaces of each prefabricated plate are adapted to multiple module combinations, reducing the complexity of component types. It truly saves templates, quickly constructs, has a simple process, is convenient and quick to construct, and reduces costs.

Claims

1. A modular building single-board splicing structure, characterized by: It includes a precast concrete base plate, multi-sided precast concrete wall panels, a precast concrete top plate, U-shaped closed stirrups, L-shaped steel bars, metal corrugated pipes, shear keys, circular steel bars, post-cast concrete, and a steel cage; the precast concrete base plate is pre-embedded with L-shaped steel bars, and the left and right sides of the precast concrete wall panels are pre-embedded with U-shaped closed stirrups. Adjacent wall panels extend out of concrete thin plates and replace the later formwork after assembly; shear keys-metal corrugated pipes with welded shear keys are pre-embedded on the upper and lower sides of the precast concrete wall panels.

2. The modular building single-board splicing structure according to claim 1, characterized in that: The precast concrete bottom plate and precast concrete top plate are of a flip-up design. Part of the concrete structure of the precast concrete bottom plate or precast concrete top plate extends out from the joint with the precast concrete wall plate to form a cast-in-place wall plate structure. The joint method of the precast concrete bottom plate or precast concrete top plate with the precast concrete wall plate is changed from the joint of horizontal plate and vertical plate to the joint of vertical plate and vertical plate.

3. The modular building single-board splicing structure according to claim 1, characterized in that: The L-shaped steel bars extending from the precast concrete base plate are pre-buried in the lower steel bars inside the precast concrete base plate. They are formed by the structural steel bars of the precast concrete base plate extending outwards, and no further tying of connecting steel bars is required.

4. The modular building single-board splicing structure according to claim 3, characterized in that: The L-shaped steel bars extending from the precast concrete base plate are not evenly distributed. The steel bars are densely distributed at the edge of the connection part with the wall panel where stress is unfavorable, and the ends of the steel bars are blunted to increase the anchoring performance of the connection.

5. The modular building single-board splicing structure according to claim 1, characterized in that: The precast concrete wall panels include precast concrete front wall panels, precast concrete door and window wall panels, precast concrete rear wall panels, precast concrete left wall panels, and precast concrete right wall panels; U-shaped closed stirrups formed by extending the structural steel bars outward are embedded on the left and right sides of each wall panel, and a thin concrete plate extends 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; metal corrugated pipes welded with shear keys are embedded on the upper and lower sides of the precast concrete wall panels, and the positions of the upper and lower embedded metal corrugated pipes are exactly opposite to the L-shaped steel bars extending from the precast concrete bottom plate.

6. The modular building single-board splicing structure according to claim 1, characterized in that: The steel mesh around the upper steel bars of the precast concrete top plate is not poured with concrete, and the reserved holes in the precast concrete top plate are positioned just opposite to the precast concrete wall panels where the metal corrugated pipes with shear keys are pre-embedded and welded.

7. The modular building single-board splicing structure according to claim 1, 5 or 6, characterized in that: The precast concrete wall panels are pre-embedded with metal bellows welded with shear keys on the upper and lower sides of the wall. The shear keys are box-shaped steel plates with a hole in the middle of the top and are welded to the edge of the metal bellows to form a whole. Concrete grouting holes are provided around them, and the shear key part extends beyond the edge of the concrete wall.

8. The modular building single-board splicing structure according to claim 1, characterized in that: The precast concrete bottom plate or floor plate is provided with a stepped structure with a lower outside and a higher inside for waterproofing purposes, and the lower side of the precast concrete wall plate is provided with a corresponding stepped structure with a higher outside and a lower inside for waterproofing purposes.

9. A construction method for a modular building single-panel splicing structure, characterized by: The following steps are included: 1) The precast concrete wall panels are hoisted and placed on the precast concrete base plate. The L-shaped steel bars extending from the precast concrete base plate are inserted into the metal corrugated pipes with shear keys embedded in the lower side of the precast concrete wall panels. After the support is completed, the post-cast concrete is poured into the connection between the metal corrugated pipes and the precast concrete base plate and the precast concrete wall panels to complete the consolidation. 2) After the precast concrete base plate 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 side wall, the precast concrete left wall, and the precast concrete right wall, need to be connected by pre-embedded U-shaped closed stirrups on the left and right sides of each wall. The U-shaped closed stirrups at the corresponding positions of the two side walls are placed in the corresponding positions, and a steel cage is placed in the overlapping area of the U-shaped closed stirrups. The concrete thin plate is used as a formwork, and then the post-cast concrete is poured into the connection of the wall to complete the consolidation. 3) The precast concrete top plate is hoisted and placed to the corresponding position on the precast concrete wall panel. After placement, L-shaped steel bars are inserted into the metal corrugated pipe with shear keys embedded on the upper side of the precast concrete wall panel and the reserved holes of the precast concrete top plate connected to it. The upper side of the L-shaped steel bar is welded to the upper steel bar of the precast concrete top plate. The vertical steel bars extending above the door and window wall are inserted into the reserved holes of the top plate. The top plate-wall panel connection area is poured with post-poured concrete to connect the entire module into one, completing the construction of modular building single panel splicing.

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