A modular precast concrete unit that requires no formwork or support for installation.

Abstract

This utility model discloses a precast concrete module unit that requires no formwork or support for installation. It includes a cuboid structure formed by four side walls, a bottom slab, and a top slab. Several shear walls are provided on the side walls. Metal connecting components are provided at the four horizontal edges at the top and the vertical edges (excluding the corners of the shear walls) of the cuboid structure. Reinforcing bars extend from the bottom edges of the side walls into the bottom slab. This utility model eliminates the need for formwork and supports during construction, significantly reduces wet work, improves module rigidity and production efficiency, and lowers construction costs.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building technology, specifically to a segmented precast concrete module unit that can be installed without molds or supports. Background Technology

[0002] Modular construction, as one of the core forms of prefabricated construction, involves dividing a building into independent modular units according to its function. These units are manufactured in a factory, integrating structure, decoration, and electromechanical systems, and then transported to the site for assembly. Modular construction offers advantages such as high industrialization, fast construction speed, and controllable building quality, and has become an important development direction for multi-story and high-rise prefabricated buildings. Modular construction is suitable for 3-40 story multi-story and high-rise prefabricated residential, apartment, and office buildings using shear wall structures.

[0003] Existing multi-story and high-rise modular concrete buildings mostly adopt box-type modular units. These units consist of a formwork plate with a thickness of only 30mm, a top plate, a bottom plate, and lightweight wall panels. The formwork plate is only used as a temporary construction template for on-site casting of concrete shear walls, beams, and other structural components, which has the following significant drawbacks: 1. Serious waste of materials: Shear wall formwork panels do not participate in structural stress and cannot be disassembled and reused, and they increase the building's self-weight, resulting in an increase in the main materials of the superstructure and foundation; 2. High amount of wet work: Vertical load-bearing components need to be poured on site, and formwork still needs to be erected for the external shear walls and edge beams, which is out of step with the industrialization advantages of prefabricated buildings; 3. Weak module stiffness: The shear wall formwork plate is only 30mm thick, the overall lateral stiffness of the module unit is weak, the deformation rate is high during transportation and hoisting, and the cost of protecting the finished product is increased; 4. Impact on internal pre-finishing: The formwork plate cannot withstand the lateral pressure and vibration of the vibrator during the casting of the cast-in-place shear wall, which is prone to bulging and cracking. Tie rods with a spacing of 500-600mm need to be installed. The sealing of the tie rod holes in the later stage can easily cause leakage risks and damage the internal pre-finishing surface of the module. 5. Low production efficiency: The vertical precast formwork is connected to the top and bottom slabs by steel reinforcement lap splices. The top slab can only be made after the bottom slab concrete has solidified to 75% of the design strength. The production cycle of a single module unit is long and cannot meet the needs of large-scale production and supply.

[0004] To address the aforementioned issues, this invention proposes a precast concrete modular unit that requires no formwork or support for installation. By optimizing the modular structure design, production, and installation processes, it completely overcomes the shortcomings of box-type modular units, thereby improving the industrialization level and construction efficiency of prefabricated buildings. Utility Model Content

[0005] The purpose of this invention is to provide a precast concrete modular unit that can be installed without molds or supports, in order to solve the problems of material waste, large amount of wet work, weak rigidity and low production efficiency of existing box-type modular units.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A precast concrete module unit that requires no formwork or support for installation includes a cuboid structure formed by four side walls, a bottom slab, and a top slab. Several shear walls are provided on the side walls. Metal connecting components are provided at the four horizontal edges at the top and the vertical edges except at the corners of the shear walls in the cuboid structure. Reinforcing bars extend from the bottom side of the side walls into the bottom slab.

[0007] Preferably, the shear wall includes a shear wall body, a primary precast portion of the edge members, and a secondary precast portion. The shear wall body and the primary precast portion of the edge members are precast integrally with the side walls of their respective planes. Several horizontal U-shaped steel bars extend from adjacent sides of the shear wall body and the primary precast portion of the edge members. The horizontal U-shaped steel bars extend into the secondary precast portion. Several horizontal stirrups and several vertical steel bars are provided in the secondary precast portion.

[0008] Preferably, the metal connection assembly includes several steel plates and several anchoring bars. The steel plates are embedded in the inner corner of the two side walls and are flush with the corresponding side wall surfaces. The two steel plates are arranged in a T-shape. The anchoring bars are evenly distributed in parallel along the length of the steel plates. One end of the anchoring bar is welded to the steel plate, and the other end of the anchoring bar is embedded in the side wall. The sides of the steel plates used for butt joints are beveled.

[0009] Preferably, several module units are arranged side by side in the vertical direction, several metal corrugated pipes are provided inside the shear wall, and coaxial vertical equivalent replacement steel bars are fixedly installed inside the metal corrugated pipes. A connecting sleeve is provided between two adjacent vertical equivalent replacement steel bars in the vertical direction, and the vertical equivalent replacement steel bars are arranged along the entire length of the module unit.

[0010] Preferably, the side wall includes a non-load-bearing outer perimeter wall and a non-load-bearing inner partition wall. Short reinforcing bars are fixedly installed between adjacent non-load-bearing outer perimeter walls in the vertical direction. The diameter of the short reinforcing bars is 8-16mm, and the length of the short reinforcing bars anchored into the wall is not less than the larger of 30 times the diameter of the reinforcing bar and 200mm.

[0011] Preferably, precast beam molds are reserved on both sides of the top of the non-load-bearing outer perimeter wall, and precast beam molds are reserved on one side of the top of the non-load-bearing inner partition wall. After the non-load-bearing inner partition walls on the same floor are installed back to back, a cast-in-place beam channel is formed, and extruded polystyrene board is laid at the bottom of the cast-in-place beam channel.

[0012] Preferably, no temporary supports are required under the top slab during the construction phase. The top slab contains a first reinforcing bar, which is prestressed in the short direction and ordinary in the long direction. The ends of the first reinforcing bar do not extend beyond the side of the top slab, and the spacing between them is 100-200mm. A composite layer is reserved on the top slab. The composite layer contains lapped reinforcing bars and a second reinforcing bar. The lapped reinforcing bars overlap with the first reinforcing bars in the composite layer, and the lap length is not less than 1.2 times the basic anchorage length of the tension reinforcing bar.

[0013] Preferably, the base slab has built-in bidirectional structural reinforcement bars with a diameter of 6-10mm and a spacing of 100-200mm. The lap length of the bottom extension bars of the shear wall, non-load-bearing outer enclosure wall, and non-load-bearing inner partition wall and the bidirectional structural reinforcement bars of the base slab is not less than 1.2 times the basic anchorage length of the tension reinforcement bars.

[0014] Preferably, the non-load-bearing outer perimeter wall, non-load-bearing inner partition wall, and base plate are made of lightweight aggregate concrete and contain polypropylene fibers with a volume ratio of 0.1% to 0.2%.

[0015] Preferably, the horizontal bonding surface of the upper and lower concrete module units is filled with 20-30mm of high-strength grout.

[0016] The beneficial effects of this utility model are as follows: 1. Significantly reduced wet work: Vertical load-bearing components are prefabricated as a whole with modular units, reducing the amount of wet work on site. Shear walls and edge beams do not require formwork, significantly reducing construction costs and shortening the overall construction period. 2. Achieve pre-decoration of interior: The side walls of the modular units are all prefabricated, and the top slab is a support-free composite slab. There are no temporary supports or tie rod reinforcement measures inside during hoisting and concrete pouring, and the interior pre-decoration can be completed in the factory. 3. Reliable and efficient connection: The shear wall is connected by metal corrugated pipes and single-row large-diameter equivalent replacement steel bars, combined with connecting sleeves, which makes the installation efficient, the force transmission direct, and the quality controllable; 4. Low production cost: Each component is prefabricated in sections and the ends do not have protruding steel bars. Industrialized assembly line production is achieved by relying on small universal molds. Compared with traditional production processes, the mold cost is greatly reduced, and the mold ratio is highly flexible and can be adapted to different house sizes. 5. High production efficiency: The top slab and side walls can be produced simultaneously at different workstations. After quick assembly at the final assembly station, the bottom slab concrete is poured. There is no overlap in operations, the process is reasonable, the three-dimensional molding speed is fast, and the production cycle is significantly shortened. 6. Improved module stiffness: The metal connecting components are welded to form an internal steel frame, which improves the overall lateral stiffness of the module unit, reduces the deformation rate during transportation and hoisting, effectively avoids hoisting deformation and damage to the internal decoration, and reduces the cost of finished product protection; 7. Lightweight and low construction cost: The application of lightweight aggregate concrete reduces the weight of the module, lowers the cost of lifting equipment, and improves thermal insulation performance. Attached Figure Description

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Figure 1 This is a floor plan of the modular building of this utility model; Figure 2 This is a diagram showing the assembly of the modular unit components of this utility model; Figure 3 This is a diagram of the metal connection component of the modular unit of this utility model; Figure 4 This is a schematic diagram of the modular unit steel plate and anchoring steel bars of this utility model; Figure 5 This is a diagram showing the assembly and connection of the side walls in the modular unit of this utility model; Figure 6 This is a diagram showing the assembly and connection of the side wall and top plate in the modular unit of this utility model; Figure 7 This is a diagram showing the assembly and connection of the side wall and the bottom plate in the modular unit of this utility model; Figure 8 This is a diagram showing the assembly and connection of the shear wall at the corner of the modular unit of this utility model. Figure 9 This is a structural diagram of the vertical connection of the shear wall and the top plate end support of the upper and lower modular units of this utility model; Figure 10 This is a structural diagram of the vertical connection of the non-load-bearing outer perimeter wall and the top plate end support of the upper and lower module units of this utility model; Figure 11 This is a structural diagram of the vertical connection of the non-load-bearing internal partition wall and the support in the top plate of the upper and lower modular units of this utility model; In the diagram: 1. Modular unit; 2. Shear wall; 2.1. Primary precast section; 2.2. Secondary precast section; 2.3. Shear wall body; 2.4. Horizontal stirrups; 2.5. Horizontal U-shaped reinforcement; 2.6. Vertical reinforcement; 2.7. First protruding reinforcement; 3. Non-load-bearing outer perimeter wall; 3.1. Second protruding reinforcement; 4. Non-load-bearing inner partition wall; 4.1. Third protruding reinforcement; 5. Base slab; 5.1. Two-way structural steel. 6. Top slab; 6.1. First reinforcing bar; 6.2. Lap reinforcement; 6.3. Second reinforcing bar; 7. Lightweight partition; 8. Metal connection assembly; 8.1. Steel plate; 8.2. Anchoring reinforcement; 9. Corrugated metal pipe; 10. Vertical equivalent replacement reinforcement; 11. Connecting sleeve; 12. High-strength grout; 13. Short dowel bar; 14. Cast-in-place beam channel; 14.1. Precast beam formwork; 14.2. Extruded polystyrene board. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0020] like Figure 1 , 2 As shown, a precast concrete module unit 1 that requires no formwork or supports for installation includes a cuboid structure formed by four side walls, a bottom slab 5, and a top slab 6. In this embodiment, the side walls of the module unit 1 include shear walls 2, non-load-bearing external walls 3, and non-load-bearing internal partition walls 4, and are equipped with lightweight partitions 7.

[0021] like Figure 3 , 4As shown in Figures 5 and 6, metal connection components 8 are provided at the four horizontal edges at the top and at the vertical edges except for the corner of shear wall 2 in the cuboid structure. Each metal connection component 8 includes several steel plates 8.1 and several anchoring reinforcing bars 8.2. The anchoring reinforcing bars 8.2 are evenly distributed side-by-side along the length of the steel plates 8.1. One end of each anchoring reinforcing bar 8.2 is welded perpendicularly to the steel plate 8.1, and the other end is embedded in the side wall, with an anchoring length of not less than 150mm. The metal connection components 8 are embedded in adjacent side walls and at the inner angle between the side wall and the top plate 6, for the assembly and welding of adjacent side walls and between the side wall and the top plate 6. The T-shaped arrangement of the two steel plates 8.1 provides a certain degree of tolerance for assembly and welding. The sides of the steel plates 8.1 used for butt joints have a 30°-45° bevel to ensure that the weld height inside the module unit 1 is not exposed, and the weld height is not less than 4mm, thus not affecting the interior finishing layer construction. After welding, two coats of epoxy zinc-rich primer are applied for corrosion protection. Furthermore, the metal connecting components 8 form the built-in steel frame of the concrete module unit 1, improving its rigidity and significantly reducing the deformation rate during transportation and hoisting, as well as the cost of protecting the finished product. This effectively avoids deformation during hoisting of the module unit and damage to the internal decoration.

[0022] like Figure 7 , 9 As shown in Figures 10 and 11, the base plate 5 is a non-structural component, serving only as a substrate for the surface finishing during the production and hoisting stages. Preferably, the base plate 5 incorporates bidirectional structural steel bars 5.1 with a diameter of 6-10 mm and a spacing of 100-200 mm. The first protruding steel bars 2.7, the second protruding steel bars 3.1, and the third protruding steel bars 4.1, arranged on the bottom sides of the shear wall 2, the non-load-bearing outer perimeter wall 3, and the non-load-bearing inner partition wall 4, are lapped together with the bidirectional structural steel bars 5.1 of the base plate 5. The lap length is not less than 1.2 times the basic anchorage length of the tensile steel bars. The base plate 5 is precast using LC20 lightweight aggregate concrete with a dry density not exceeding 1800 kg / m³, incorporating 0.1%-0.2% polypropylene fiber by volume. After casting, it is cured for 1 day or steam-cured for 8 hours to ensure a compressive strength of over 15 MPa, thus completing the fabrication of the base plate 5.

[0023] like Figure 8As shown, preferably, the shear wall 2 includes a shear wall body 2.3, a primary prefabricated portion 2.1 of the edge member, and a secondary prefabricated portion 2.2. The shear wall body 2.3 and the primary prefabricated portion 2.1 of the edge member are prefabricated integrally with the side walls of their respective planes. Several horizontal U-shaped steel bars 2.5 extend from the adjacent sides of the shear wall body 2.3 and the primary prefabricated portion 2.1 of the edge member. The horizontal U-shaped steel bars 2.5 extend into the secondary prefabricated portion 2.2. Several horizontal stirrups 2.4 with a diameter of 8-10mm and several vertical steel bars 2.6 are provided in the secondary prefabricated portion 2.2, and metal corrugated pipes 9 are pre-embedded. The secondary prefabricated portion 2.2 of the edge member is poured with micro-expansion concrete with a strength grade of not less than C30. After curing to 75% of the design strength, the overall prefabrication of the module unit 1 is completed.

[0024] like Figure 9 As shown, preferably, the shear wall 2 is provided with several corrugated metal pipes 9, and an equivalent replacement steel bar 10 for the shear wall 2 is provided at the center of each corrugated metal pipe 9. The equivalent replacement steel bars 10 of the upper and lower layers are connected by connecting sleeves 11, and the vertical equivalent replacement steel bars 10 are arranged along the entire length of the module unit 1. The diameter and number of the vertical equivalent replacement steel bars 10 are determined according to structural calculations, and the height extending beyond the finished surface of the structure is not less than 150mm. In this embodiment, the inner diameter of the corrugated metal pipes 9 in the shear wall 2 is φ132mm, the thickness is 0.4mm, and they are arranged in a single row in the middle of the wall, corresponding to the position of the vertical equivalent replacement steel bars 10 of the shear wall 2. Concrete is poured inside the corrugated metal pipes 9.

[0025] like Figure 10 As shown, preferably, the side wall includes a non-load-bearing outer perimeter wall 3 and a non-load-bearing inner partition wall 4. The adjacent non-load-bearing outer perimeter walls 3 are vertically connected by short reinforcing bars 13 with a diameter of 8-16mm. The length of the metal corrugated pipe 9 anchored in the wall is not less than 30 times the diameter of the reinforcing bar, ensuring a reliable connection between the non-load-bearing outer perimeter wall 3 and the main structure.

[0026] like Figure 10 , 11 As shown, preferably, precast beam molds 14.1 are reserved on both sides of the top of the non-load-bearing outer perimeter wall 3, and a precast beam mold 14.1 is reserved on one side of the top of the non-load-bearing inner partition wall 4. The reserved height of the precast beam molds 14.1 is 250-600mm. After the non-load-bearing inner partition walls 4 on the same floor are installed back to back, a cast-in-place beam channel 14 is formed. The bottom of the cast-in-place beam channel 14 is covered with extruded polystyrene board 14.2. The thickness of the extruded polystyrene board 14.2 is 20-30mm and is used to seal gaps. After laying the extruded polystyrene board 14.2, the beam reinforcement cage can be tied, and beam concrete with a strength grade of not less than C30 can be poured between the precast beam molds 14.1. No additional formwork is required, simplifying the on-site construction process and reducing the cost of measures.

[0027] like Figure 9 , 10 As shown in Figure 11, preferably, the top slab 6 has a first reinforcing bar 6.1 built in. The first reinforcing bar 6.1 uses stress-relieving spiral ribbed steel wire with a diameter of 7mm in the short direction and is arranged at a spacing of 150mm. In the long direction, it uses HRB400 hot-rolled steel bar with a diameter of 6mm and is arranged at a spacing of 200mm. The end of the first reinforcing bar 6.1 does not extend beyond the side of the top slab 6 to facilitate the insertion of the beam reinforcement cage into the formwork and improve construction efficiency. A composite layer is reserved on the top slab 6. The composite layer is provided with lapped reinforcing bars 6.2 and second reinforcing bars 6.3. The lapped reinforcing bars 6.2 and the first reinforcing bars 6.1 are lapped in the composite layer, and the lap length is not less than 1.2 times the basic anchorage length of the tension reinforcing bar. The thickness of the composite layer is 70-120mm, and the concrete strength grade is C30 or above. The composite layer connects the various module units in the horizontal direction into a whole. When the composite layer is poured, no temporary support is required under the top slab 6, which does not affect the interior pre-decoration, simplifies the on-site construction process, and reduces the cost of measures.

[0028] like Figure 9 , 10 As shown in Figure 11, preferably, a 20-30mm thick high-strength grout 12 is poured onto the horizontal bonding surface of the upper and lower concrete module units 1. The 24-hour compressive strength of the high-strength grout 12 is above 30MPa. Pouring the high-strength grout 12 onto the bonding surface effectively enhances the interlayer bonding strength, improves the overall structural stability, and enhances the waterproof and seepage-resistant performance.

[0029] Preferably, the non-load-bearing outer perimeter wall 3, the non-load-bearing inner partition wall 4, and the base plate 5 are made of lightweight aggregate concrete with a dry density of no more than 1800 kg / m³, and contain polypropylene fibers with a volume ratio of 0.1%-0.2%. The application of lightweight aggregate concrete reduces the self-weight of the module by more than 20%, significantly reduces the cost of lifting equipment, and improves the building's thermal insulation performance.

[0030] In this embodiment, the side walls and roof slab 6 are prefabricated in sections, relying on small, universal molds to achieve industrialized assembly line production. The molds can be turned over more than 200 times, reducing mold costs by 80%. Furthermore, the mold configuration is highly flexible and can adapt to different apartment sizes. The roof slab 6 and side walls can be produced simultaneously at different workstations. At the final assembly station, the base slab 5 is poured after welding and assembling via metal connecting components 8. Production is seamless, with no overlapping operations, a rational process, and rapid three-dimensional molding. Compared to traditional production processes, the production cycle for a single module unit 1 can be shortened to 3-4 days, a reduction of approximately 50%.

[0031] In this embodiment, tower cranes are used to hoist module unit 1. Hoisting points are set at the top of shear wall 2, non-load-bearing outer perimeter wall 3, and non-load-bearing inner partition wall 4, totaling 10 hoisting points. Before hoisting module unit 1 into position, the vertical equivalent replacement steel bars 10 of the shear wall 2 on the lower layer must be connected. High-strength mortar 12 is laid at the pre-installation position of module unit 1. During hoisting, the vertical equivalent replacement steel bars 10 pass through the corrugated metal pipes 9 one-to-one, completing the hoisting process. The vertical equivalent replacement steel bars 10 of the shear wall 2 are connected via connecting sleeves 11, ensuring direct force transmission and controllable quality. The large diameter of the corrugated metal pipes 9 provides good tolerance for misalignment between upper and lower layers, making construction efficient and convenient.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model 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 this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A form-free and bracing-free installed split precast concrete modular unit, characterized by, It includes a cuboid structure enclosed by four side walls, a bottom plate (5) and a top plate (6). Several shear walls are provided on the side walls. Metal connecting components (8) are provided at the four horizontal edges at the top and at the vertical edges except at the corners of the shear walls in the cuboid structure. Reinforcing bars extend from the bottom side of the side walls into the bottom plate.

2. A formwork and falsework free installed split precast concrete modular unit according to claim 1, characterised in that, The shear wall (2) includes a shear wall body (2.3), a primary prefabricated portion (2.1) of the edge members, and a secondary prefabricated portion (2.2). The shear wall body (2.3) and the primary prefabricated portion (2.1) of the edge members are prefabricated integrally with the side walls of their respective planes. Several horizontal U-shaped steel bars (2.5) are provided on the adjacent sides of the shear wall body (2.3) and the primary prefabricated portion (2.1) of the edge members. The horizontal U-shaped steel bars (2.5) extend into the secondary prefabricated portion (2.2). Several horizontal stirrups (2.4) and several vertical steel bars (2.6) are provided in the secondary prefabricated portion (2.2).

3. The precast concrete module unit for installation without formwork or supports according to claim 2, characterized in that, The metal connection assembly (8) includes a steel plate (8.1) and several anchoring steel bars (8.2). The steel plate (8.1) is embedded in the inner corner of the two side walls and is flush with the corresponding side wall surfaces. The two steel plates (8.1) are arranged in a T-shape. The anchoring steel bars (8.2) are evenly distributed in parallel along the length of the steel plate (8.1). One end of the anchoring steel bar (8.2) is welded to the steel plate (8.1), and the other end of the anchoring steel bar (8.2) is embedded in the side wall. The steel plate (8.1) has a bevel on the side for butt joint.

4. The precast concrete module unit for installation without formwork or supports according to claim 1, characterized in that, The module units are arranged in parallel in the vertical direction. The shear wall (2) is provided with a number of metal corrugated pipes (9). The metal corrugated pipes (9) are fixedly provided with coaxial vertical equivalent replacement steel bars (10). A connecting sleeve (11) is provided between two adjacent vertical equivalent replacement steel bars (10) in the vertical direction. The vertical equivalent replacement steel bars (10) are arranged along the entire length of the module unit (1).

5. A precast concrete module unit for installation without formwork or supports according to claim 4, characterized in that, The side wall includes a non-load-bearing outer perimeter wall (3) and a non-load-bearing inner partition wall (4). Short reinforcing bars (13) are fixedly installed between adjacent non-load-bearing outer perimeter walls (3) in the vertical direction. The diameter of the short reinforcing bars (13) is 8-16mm. The length of the short reinforcing bars (13) anchored into the wall is not less than the larger of 30 times the diameter of the reinforcing bar and 200mm.

6. A precast concrete module unit for installation without formwork or supports according to claim 5, characterized in that, The non-load-bearing outer perimeter wall (3) has precast beam molds (14.1) reserved on both sides of the top, and the non-load-bearing inner partition wall (4) has a precast beam mold (14.1) reserved on one side of the top. The non-load-bearing inner partition walls (4) on the same floor are installed back to back to form a cast-in-place beam groove (14). The bottom of the cast-in-place beam groove (14) is covered with extruded polystyrene board (14.2).

7. A precast concrete module unit for installation without formwork or supports according to claim 2, characterized in that, During the construction phase, no temporary support is required under the top slab (6). The top slab (6) contains a first reinforcing bar (6.1). The first reinforcing bar (6.1) is made of prestressed steel in the short direction and ordinary steel in the long direction. The ends of the first reinforcing bar (6) do not extend beyond the side of the top slab (6). The spacing between the bars is 100-200mm. A composite layer is reserved on the top slab (6). The composite layer contains lapped reinforcing bars (6.2) and a second reinforcing bar (6.3). The lapped reinforcing bars (6.2) and the first reinforcing bars (6.1) are lapped in the composite layer, and the lap length is not less than 1.2 times the basic anchorage length of the tensile reinforcing bar.

8. A precast concrete module unit for installation without formwork or supports according to claim 5, characterized in that, The base plate (5) has built-in bidirectional structural steel bars (5.1) with a diameter of 6-10mm and a spacing of 100-200mm. The lap length of the bottom extension steel bars of the shear wall (2), the non-load-bearing outer enclosure wall (3), and the non-load-bearing inner partition wall (4) and the bidirectional structural steel bars (5.1) of the base plate (5) is not less than 1.2 times the basic anchorage length of the tensile steel bars.

9. A precast concrete module unit for installation without formwork or supports according to claim 8, characterized in that, The non-load-bearing outer perimeter wall (3), non-load-bearing inner partition wall (4), and base plate (5) are made of lightweight aggregate concrete and contain polypropylene fibers with a volume ratio of 0.1% to 0.2%.

10. A precast concrete module unit for installation without formwork or supports according to claim 5, characterized in that, The horizontal bonding surfaces of the upper and lower concrete module units are filled with 20-30mm of high-strength grout (12).

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