Prestress composite structure modular building system and construction method

Abstract

The invention provides a prestressed composite structure modular building system and a construction method, and relates to the technical field of construction engineering. After the stud B of the ceiling beam penetrates through the stud B mounting hole of the floor beam, grouting is conducted in the floor beam, and the module units are vertically connected through the stud B, the stud A of the floor beam and a beam grouting body formed after grouting together. Beam holes and column holes are formed in webs of the ceiling beams and the upper ends of the columns respectively, column steel pipes are arranged in column grouting cavities of the columns, horizontal prestressed tendons which are transversely or longitudinally arranged are placed and fixed through the beam holes, the column holes and the column steel pipes, and the ceiling beams and the columns of the adjacent module units in the same layer are horizontally connected. After column-column connecting pieces are placed in the column grouting cavities, grouting is conducted, and connection of columns of the upper-layer module unit and the lower-layer module unit is achieved. After grouting of the floor beams is completed, prestress is applied by tensioning the horizontal prestressed tendons, and horizontal connection is reinforced. And due to the overall cooperative stress of the building system, the integrity and the stress performance of the modular building are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to a prestressed composite structure modular building system and a construction method. Background Art

[0002] In recent years, with the continuous development of the global economy and society, energy conservation and environmental protection have gradually become the requirements of the development of the times. Compared with the traditional construction method with long construction period, uneven quality and serious environmental pollution, modular construction has gradually become an important development direction of building industrialization due to its fast and efficient construction, good engineering quality and environmental friendliness. Modular construction is the most integrated building form in prefabricated buildings. It divides the entire building into several modular units for construction. The modular units are prefabricated in the factory and then transported to the site for overall assembly. Since modular buildings are assembled from several independent modules, the structural integrity and seismic performance of modular buildings are directly related to the connection form between the modules.

[0003] Modular buildings are assembled on site from multiple modular units, so the connection between modules has a crucial impact on the efficiency and safety of modular building construction on site. The connection between modular units also plays a vital role in the seismic performance and stability of modular buildings. Therefore, the connection between modular units must not only ensure the strength and stiffness requirements of the structure, but also consider the synergy between modular units to ensure that each modular unit can effectively disperse and transfer the load. Figure 1 As shown in , Deng et al. proposed a new fully assembled hoistable node for modular steel structures, which realizes the vertical and horizontal connection between modules through vertical bolts, through bolts, node plates and angle pieces welded at the column ends. This connection method is relatively simple to construct on site, and the connection between modules can be achieved by only tightening the vertical bolts and through bolts. However, the connection stiffness of this node is low, and the bearing capacity is not high, so it is difficult to use in high-rise buildings. Figure 2 As shown in , Chen et al. proposed a self-locking modular connection node, which only needs to pass the connection piece through the tenon of the lower module during on-site construction, and then align the column hole of the upper module corner piece bottom plate with it to achieve the connection between modules. The connection stiffness and bearing capacity of this node are poor, and the component processing accuracy and on-site lifting accuracy requirements are high. Figure 3As shown in the figure, Pan et al. developed a new type of non-contact lap steel bar based on grouting bellows connection technology. This connection method only requires inserting convex ribs into the pipe and grouting from the top to the bottom of the grouting pipe to achieve vertical connection between modules. This connection method can effectively reduce the grouting work on site of concrete modular buildings, but the grouting sleeve connection requires high precision, the on-site hoisting construction is difficult, and the grouting quality is difficult to detect. In addition, due to the limitation of hoisting weight, the size of concrete modular units suitable for this node is generally small. Figure 4 As shown in , Zheng et al. proposed a modular connection method for vertical prestressed steel structures. This connection method requires stacking modular steel frames together, then passing the tie rods vertically through the steel pipe columns, connecting them to the connectors through locking nuts, and applying post-tensioning force at the top. The lateral relative movement between modules in this connection method is only resisted by friction or the shear resistance provided by the connectors, so it is only suitable for low-rise buildings in areas with low earthquake risks. Figure 5 As shown in , Chen et al. proposed a prefabricated connection method for vertical prestressed steel-concrete composite structures. This connection method requires first aligning the steel strands or dowels and inserting them into the pre-set holes, inserting shear blocks into the corresponding rectangular holes, and then aligning the upper units and dropping them down. The steel strands are then stretched to the design stress and fixed with anchors, and finally concrete is poured into the module columns from the casting holes. This connection method improves the connection stiffness between modules and the integrity of the structure, but the integration is low, and the alignment of the upper and lower components is difficult. In addition, in this connection method, after each layer is hoisted, prestressing needs to be performed once, which is troublesome to construct and easily causes prestress loss. The tensioning and anchoring of the vertical steel strands on site are also difficult.

[0004] In summary, the full bolt connection and self-locking connection used in modular steel structures in the prior art have weak rigidity and are difficult to be used in high-rise structures; the grouting sleeve connection used in modular concrete structures has high requirements for on-site construction accuracy, and the grouting quality is difficult to observe and detect; the existing modular prestressed connections are all vertical connections, and in actual construction, vertical prestressed tendons are difficult to anchor. After each layer of modules is hoisted, prestressing work needs to be carried out, which increases the difficulty of construction and easily causes prestress loss. In addition, due to the construction characteristics of the modular structure itself, the connection between the floor slabs of each layer of modules is weak, and they cannot be coordinated and do not meet the requirements of the rigid floor slab assumption, which increases the difficulty of building design. Summary of the invention

[0005] The present invention provides a prestressed composite structure modular building system and a construction method. The prior art has the problem that the full bolt connection and self-locking connection applied to modular steel structures have weak rigidity and are difficult to be applied to high-rise structures; the grouting sleeve connection applied to modular concrete structures has high requirements on the on-site construction accuracy, and the grouting quality is difficult to observe and detect; the modular prestressed connections are all vertical connections, and the vertical prestressed tendons are difficult to anchor in actual construction. After each layer of modules is hoisted, prestressing tensioning work needs to be carried out once, which increases the difficulty of construction and easily causes prestress loss; the connection between the floor slabs of each layer of modules is weak, and the force cannot be coordinated, and the requirements of the rigid floor slab assumption are not met, which increases the difficulty of building design.

[0006] In order to solve the above-mentioned invention problems, the technical solutions provided by the present invention are as follows: On the one hand, a prestressed composite structure modular building system includes a module unit, each of the module units includes four columns arranged in a rectangular shape, the upper ends of two adjacent columns are connected by a ceiling beam, and the lower ends are connected by a floor beam, and a prefabricated bottom plate is arranged at the web of the floor beam; The column comprises a column body and a column grouting cavity at both ends of the column body, a column steel pipe is arranged in the column grouting cavity, a column hole connected with the column steel pipe is arranged at the upper end of the column body, a horizontal prestressed tendon enters the column steel pipe and the space formed by the upper and lower flanges and the web of the ceiling beam through the column holes of the adjacent module units, a column grouting body is grouted in the column grouting space, and a beam grouting body is grouted in the space formed by the upper and lower flanges and the web of the floor beam; Beam holes are provided on the web of the ceiling beam, and horizontal prestressed tendons are installed in the beam holes. The same horizontal prestressed tendon is installed in the beam holes of two adjacent module units. The four module units located in the same layer are connected, and the same horizontal prestressed tendon is installed in the column holes of two adjacent module units and the space formed by the upper and lower flanges and web of the ceiling beam.

[0007] Preferably, vertically arranged studs B are welded on the top surface of the upper flange of the ceiling beam, vertically arranged studs A are welded on the bottom surface of the upper flange of the floor beam, and stud B mounting holes are opened on the lower flange at intervals; the lower end of the column-to-column connector is inserted into the column of the module unit located on the lower layer, the upper end is inserted into the column of the module unit located on the upper layer, the middle connecting part is sandwiched between the module unit located on the upper layer and the module unit located on the lower layer, and the stud B of the module unit located on the lower layer is inserted into the stud B mounting hole of the module unit located on the upper layer.

[0008] Preferably, column grouting holes and exhaust holes are provided at both upper and lower ends of the column body.

[0009] Preferably, the cross-sections of the ceiling beams and the floor beams are C-shaped, U-shaped or rectangular.

[0010] Preferably, at the middle connection portion of the column-column connector, the bolt B of the module unit located at the lower layer is inserted into the through hole of the middle connection portion of the column-column connector and the mounting hole of the bolt B of the module unit located at the upper layer; at the middle connection portion of the non-column-column connector, a high-strength grouting material is provided in the gap space formed by the floor beams of the module unit located at the upper layer and the ceiling beams of the module unit located at the lower layer.

[0011] Preferably, the through holes of the same column-to-column connector are respectively sleeved on the pegs B of two adjacent module units.

[0012] On the other hand, a construction method of a prestressed composite structure modular building system is provided, using the prestressed composite structure modular building system, the construction method comprising: Factory-fabricated modular units; Assemble adjacent module units on the same floor on site, insert the same horizontal prestressed tendon into the column holes, column steel pipes and ceiling beams of the adjacent module units, and perform preliminary anchoring at both ends of the horizontal prestressed tendon; placing a column-to-column connector on a column of a module unit located at a lower level, and grouting a column grouting cavity at an upper portion of the column through a column grouting hole; Sleeve the column of the module unit located on the upper layer on the column-column connector, and pass the bolt B of the module unit located on the lower layer through the bolt B installation hole of the module unit on the upper layer; at the middle connection part of the column-column connector, insert the bolt B of the module unit located on the lower layer into the through hole of the middle connection part of the column-column connector and the bolt B installation hole of the module unit located on the upper layer; insert the same horizontal prestressed tendon into the column hole, column steel pipe and ceiling beam of the adjacent module unit located on the upper layer, and preliminarily anchor the two ends of the horizontal prestressed tendon, and grout the column grouting cavity of the lower part of the column located on the upper layer through the column grouting hole; grout the space formed by the flange and web of the floor beam with high-strength grouting material, and fill the gap space between the ceiling beam and the floor beam through the bolt B installation hole; After the grouting material reaches the required strength, the horizontal prestressed tendons of the lower module units are tensioned to apply prestress, and the ends of the horizontal prestressed tendons are further anchored to achieve horizontal connection between the module units.

[0013] Compared with the prior art, the above technical solution has at least the following beneficial effects: The above scheme, the prestressed composite structure modular building system and construction method of the present invention, ensure the stability of the module unit combination in the horizontal and vertical directions. The vertically arranged studs B are welded to the ceiling beams, and the vertically arranged studs A are welded to the floor beams. After the studs B pass through the stud B installation holes of the floor beams, they are grouted in the floor beams, so that the studs A, studs B and the beam grouting bodies (concrete tenons) formed after grouting jointly combine the ceiling beams, floor beams and prefabricated bottom plates of the upper and lower module units to achieve vertical connection between the module units. Beam holes and column holes are respectively set at appropriate positions on the web of the ceiling beam and the upper end of the column, and column steel pipes are set in the column grouting cavity of the column. The horizontal prestressed tendons arranged horizontally or vertically are placed and fixed through the beam holes, column holes and column steel pipes, and the ceiling beams and columns of adjacent module units in the same layer are combined, thereby achieving horizontal connection between the module units. After placing the column-column connectors in the column grouting cavities located in the lower layer, grouting is performed, and then grouting is performed in the column grouting cavities of the module units located in the upper layer, so as to realize the connection between the columns of the upper and lower module units. After the floor beams are grouted, prestress is applied by tensioning the horizontal prestressed tendons to further strengthen the horizontal connection between the module units, so that the floor system formed by the module units on the same layer can be coordinated as a whole to achieve or approach a rigid floor system, thereby improving the integrity and force performance of the modular building. The combined structure modular building system and construction method of the present invention have high assembly efficiency and fast construction speed, have good force performance and integrity, reduce the design difficulty of modular buildings, provide a new solution for the development of the modular building industry, and have great market application potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 It is a structural schematic diagram of a new fully assembled hoistable node of a modular steel structure in the prior art;

[0016] Figure 2 It is a structural schematic diagram of a self-locking modular steel structure connection node in the prior art;

[0017] Figure 3 It is a structural schematic diagram of a modular connection of grouted corrugated pipe concrete in the prior art;

[0018] Figure 4 It is a structural schematic diagram of the modular connection of the vertical prestressed steel structure in the prior art;

[0019] Figure 5 It is a structural schematic diagram of the assembled connection of the vertical prestressed steel-concrete composite structure in the prior art;

[0020] Figure 6 It is a structural schematic diagram of a module unit of the prestressed composite structure modular building system of the present invention;

[0021] Figure 7 It is a schematic structural diagram of four module units of the prestressed composite structure modular building system of the present invention being spliced ​​on the same layer;

[0022] Figure 8 A schematic diagram of the structure of installing column-to-column connectors for the module units of the prestressed composite structure modular building system of the present invention;

[0023] Fig. 9 It is a schematic structural diagram of the upper and lower layers of modular units spliced ​​together in the prestressed composite structure modular building system of the present invention;

[0024] Fig.10 It is a schematic diagram of the internal structure of a column of the prestressed composite structure modular building system of the present invention;

[0025] Fig.11 It is a structural schematic diagram of a connection node of a column-to-column connector of a prestressed composite structure modular building system of the present invention;

[0026] Fig.12 It is a structural schematic diagram of a C-beam-beam combination of a prestressed composite structure modular building system of the present invention;

[0027] Fig.13 It is a structural schematic diagram of a U-shaped beam-beam combination of the prestressed composite structure modular building system of the present invention;

[0028] Fig.14 It is a structural schematic diagram of a rectangular beam-beam combination of the prestressed composite structure modular building system of the present invention;

[0029] Fig.15 The present invention is a flowchart of the construction method of the prestressed composite structure modular building system.

[0030] The accompanying drawings are described as follows:

[0031] 1. Ceiling beam; 11. Stud B; 12. Beam hole; 2. Floor beam; 21. Stud A; 22. Stud B mounting hole; 23. Beam grouting body; 3. Column; 31. Column hole; 32. Column steel pipe; 33. Column grouting hole; 34. Exhaust hole; 35. Column grouting cavity; 4. Prefabricated base plate; 5. Column-column connector; 51. Upper end; 52. Lower end; 53. Middle connecting part; 531. Through hole; 6. High-strength grouting material; 7. Horizontal prestressed tendons. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0034] It should be noted that the terms "up", "down", "left", "right", "front", "back", etc. used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0035] Embodiment 1

[0036] like Figure 6 As shown, the present embodiment provides a prestressed composite structure modular building system, the building system is assembled from module units, each module unit includes four columns 3 arranged in a rectangular shape, the upper ends of two adjacent columns 3 are connected by a ceiling beam 1, and the lower ends are connected by a floor beam 2, and a prefabricated bottom plate 4 is arranged at the web of the floor beam 2, and a total of four ceiling beams 1, four floor beams 2, four columns 3 and a prefabricated bottom plate 4 form a hexahedron. Among them, the four sides of the prefabricated bottom plate 4 are respectively inserted into the webs of the four floor beams 2, and the four sides of the prefabricated bottom plate 4 are respectively reliably connected to the four floor beams 2. Reliable connection is a commonly used technology in modular buildings, and is usually connected using bolts or other steel-concrete anchors. Specifically, as Figure 12-14 As shown, the cross-sections of the ceiling beams 1 and the floor beams 2 are C-shaped, U-shaped or rectangular.

[0037] A vertically arranged stud B11 is welded on the top surface of the upper flange of the ceiling beam 1, a vertically arranged stud A21 is welded on the bottom surface of the lower flange of the floor beam 2, and stud B mounting holes 22 are opened on the lower flange at intervals. The positions of the stud B mounting holes 22 correspond to the positions of the stud B11, and the size of the stud B mounting holes 22 is larger than the size of the stud B11. The column 3 includes a column body, the middle interior of the column body is a solid structure (the solid structure is a precast concrete part), and the two ends of the column body have a column grouting cavity 35. A column steel pipe 32 is arranged in the column grouting cavity 35, and a column hole 31 connected to the column steel pipe 32 is arranged at the upper end of the column body. The horizontal prestressed tendon 7 enters the column steel pipe 32 through the column hole 31. Under the protection of the column steel pipe 32, the horizontal prestressed tendon 7 does not contact the column grouting body in the column grouting cavity 35, which facilitates the smooth tensioning of the subsequent horizontal prestressed tendon 7. A column grouting hole 33 and an exhaust hole 34 are provided at both the upper and lower ends of the column body. Grouting is poured into the column grouting cavity 35 through the column grouting hole 33 to obtain a column grouting body.

[0038] like Figure 7 and Figure 8 As shown, adjacent module units located in the same layer are horizontally connected, and the same horizontal prestressed tendon 7 is installed in the space formed by the column holes 31 of the two adjacent module units and the upper and lower flanges and webs of the ceiling beam 1. The horizontal prestressed tendon 7 is parallel to the web of the ceiling beam 1; the through holes 531 of the same column-to-column connector 5 are respectively mounted on the studs B11 of the two adjacent module units.

[0039] like Figure 9-11As shown, two module units arranged up and down are connected vertically, the lower end 52 of the column-column connector 5 is inserted into the column grouting cavity 35 of the column 3 of the module unit located at the lower layer, the upper end 51 is inserted into the column grouting cavity 35 of the column 3 of the module unit located at the upper layer, and the middle connecting portion 53 is sandwiched between the module unit located at the upper layer and the module unit located at the lower layer. Grouting is performed in the column grouting cavity 35 to obtain a column grouting body, thereby realizing the vertical connection between the column-column connector 5 and the column 3; the stud B11 of the module unit located at the lower layer is inserted into the stud B mounting hole 22 of the module unit located at the upper layer, and the flange and web of the floor beam 2 are formed. The space is grouted with high-strength grouting material to obtain a beam grouting body 23, thereby realizing the connection between the floor beam 2 and the ceiling beam 1; at the middle connection part 53 of the column-to-column connector 5, the bolt B11 of the module unit located at the lower layer is inserted into the through hole 531 of the middle connection part 53 of the column-to-column connector 5 and the bolt B installation hole 22 of the module unit located at the upper layer; so that at the middle connection part 53 of the non-column-to-column connector 5, the floor beam 2 of the module unit located at the upper layer and the ceiling beam 1 of the module unit located at the lower layer form a gap space, and a high-strength grouting material body 6 is provided in the gap space, thereby realizing the vertical connection between the module units. The adjacent modules are subjected to force in coordination, which significantly improves the force-bearing performance and integrity of the building. Specifically, the height of the gap space is 20 mm.

[0040] The connection method of the present invention adopts a steel-concrete composite structure. The building system of the present invention has an on-site grouting part, so during the hoisting work, only the steel part (ceiling beam 1, column 3 and floor beam 2) and the precast concrete part (the solid structure of the column body of column 3 and the precast bottom plate 4) of the module unit need to be hoisted. Compared with the concrete module of the prior art, the weight is lighter, and the size design of the module unit of the present invention is more flexible. In addition, the synergistic effect of steel and concrete enables the building to have a higher bearing capacity. The use of easy-to-install horizontal prestressed tendons 7 further enhances the bearing capacity of the building, and at the same time strengthens the lateral connection between the ceiling beam 1, column 3 and floor beam 2, so that the floor system formed between the same floor slabs can be coordinated as a whole to bear the force, realize or approach a rigid floor system, improve the integrity of the modular building, and reduce the difficulty of architectural design work.

[0041] Embodiment 2

[0042] On the basis of the first embodiment, the prestressed composite structure modular building system provided in this embodiment is additionally provided with horizontal prestressed tendons 7. Specifically, when adjacent module units located in the same layer are connected, beam holes 12 are provided on the web of the ceiling beam 1, and the same horizontal prestressed tendons 7 are installed in the beam holes 12 of the ceiling beams 1 of the adjacent module units, and the additional horizontal prestressed tendons 7 are perpendicular to the web of the ceiling beam 1, and the additional horizontal prestressed tendons 7 are used to improve the in-plane stiffness of the floor slab and the bearing capacity and integrity of the structure.

[0043] Embodiment 3

[0044] like Fig.15 As shown, based on the first and second embodiments, this embodiment provides a construction method for a prestressed composite structure modular building system, the construction method comprising:

[0045] S100, factory prefabricated modular unit;

[0046] S200, assembling adjacent module units on the same floor on site, inserting the same horizontal prestressed tendon 7 into the column holes 31, column steel pipes 32 and ceiling beams 1 of the adjacent module units, and performing preliminary anchoring on both ends of the horizontal prestressed tendon 7;

[0047] S300, placing a column-to-column connector 5 on a column 3 of a module unit located at a lower layer, and grouting a column grouting cavity 35 at an upper portion of the column 3 through a column grouting hole 33;

[0048] S400, put the column 3 of the module unit located on the upper layer on the column-to-column connector 5, and pass the stud B11 of the ceiling beam 1 of the module unit located on the lower layer through the stud B mounting hole 22 of the floor beam 2 of the module unit located on the upper layer; at the middle connection part 53 of the column-to-column connector 5, insert the stud B11 of the module unit located on the lower layer into the through hole 531 of the middle connection part 53 of the column-to-column connector 5 and the stud B mounting hole 22 of the module unit located on the upper layer; connect the same horizontal prestressed tendon 7 is inserted into the column hole 31, column steel pipe 32 and ceiling beam 1 of the adjacent module unit located on the upper layer, and the two ends of the horizontal prestressed tendon 7 are preliminarily anchored, and the column grouting cavity 35 of the lower part of the column 3 located on the upper layer is grouted through the column grouting hole 33; the space formed by the flange and web of the floor beam 2 is grouted with high-strength grouting material, and the high-strength grouting material fills the gap space between the ceiling beam 1 and the floor beam 2 through the bolt B installation hole 22, so as to realize the vertical connection between the module units;

[0049] S500, after the grouting material reaches a certain strength, the horizontal prestressed tendons 7 of the module units located at the lower layer are tensioned to apply prestress, and the ends of the horizontal prestressed tendons 7 are further anchored to achieve horizontal connection between the module units.

[0050] Specifically, in step S100, a column hole 31 is reserved at the upper end 51 of the column 3, and a column grouting cavity 35 is reserved at both ends of the column body. A column steel pipe 32 is pre-installed in the column grouting cavity 35, and the column hole 31 and the column steel pipe 32 are used to place and fix the horizontal prestressed tendons 7; according to actual needs, a beam hole 12 is reserved on the web of the ceiling beam 1, and a vertically arranged stud B11 is pre-welded on the top surface of the upper flange of the ceiling beam 1; stud B mounting holes 22 are reserved on the lower flange of the floor beam 2 at intervals, and the position of the stud B mounting holes 22 corresponds to the stud B11 on the upper flange of the ceiling beam 1, and a vertically arranged stud A21 is welded on the bottom surface of the upper flange of the floor beam 2.

[0051] Specifically, in step S200, taking the on-site assembly of four module units in the same layer as an example, the four module units are laid flat in a rectangle, the short side of the rectangle is set as the longitudinal direction, and the long side is set as the transverse direction. The same horizontal prestressed tendon 7 is inserted into two module units adjacent to each other in the transverse direction, and the same horizontal prestressed tendon 7 is inserted into two module units adjacent to each other in the longitudinal direction. After the horizontal prestress is placed, the two ends of the horizontal prestressed tendon 7 are preliminarily anchored to fix the horizontal prestressed tendon 7, which plays a role in temporarily tying the newly installed modules during the construction phase. This step is not limited to assembling four module units, and multiple module units can be spliced.

[0052] Specifically, in step S400, four module units are arranged on the upper layer, and the four module units are laid flat in a rectangle, with the short side of the rectangle set as the longitudinal direction and the long side as the transverse direction. The same horizontal prestressed tendon 7 is inserted into two module units adjacent to each other in the transverse direction, and the same horizontal prestressed tendon 7 is inserted into two module units adjacent to each other in the longitudinal direction.

[0053] The prestressed composite structure modular building system and construction method of the present invention ensure the stability of the horizontal and vertical connections of the module unit combination. The vertically arranged studs B11 are welded to the ceiling beam 1, and the vertically arranged studs A21 are welded to the floor beam 2. After the studs B11 pass through the stud B installation holes 22 of the floor beam 2, they are grouted in the floor beam 2, so that the studs A21, studs B11, and the beam grouting body 23 (concrete tenons) formed after grouting, and the high-strength grouting body in the gap space between the ceiling beam 1 and the floor beam 2, jointly combine the ceiling beam 1, the floor beam 2 and the prefabricated bottom plate 4 of the upper and lower arranged module units, and realize the vertical connection between the module units. Beam holes 12 and column holes 31 are respectively arranged at appropriate positions on the web of the ceiling beam 1 and the upper end of the column 3, and a column steel pipe 32 is arranged in the column grouting cavity 35 of the column 3. The horizontal prestressed tendons 7 arranged horizontally or longitudinally are placed and fixed through the beam holes 12, the column holes 31 and the column steel pipe 32, and the ceiling beams 1 and columns 3 of adjacent module units in the same layer are combined, thereby realizing the horizontal connection between the module units. The column-column connector 5 is placed in the column grouting cavity 35 of the upper part of the column 3 of the lower layer and then grouting is performed, and the column grouting cavity 35 of the lower part of the column 3 of the module unit in the upper layer is grouting to realize the connection of the columns 3 of the upper and lower layer module units. After the floor beam 2 is grouted, the prestress is applied by tensioning the horizontal prestressed tendons 7 to further strengthen the horizontal connection between the module units, so that the floor system formed by the module units in the same layer can be coordinated as a whole to achieve or approach a rigid floor system, thereby improving the integrity and force performance of the modular building. The combined structural modular building system and construction method of the present invention have high assembly efficiency, fast construction speed, good stress-bearing performance and integrity, reduce the design difficulty of modular buildings, provide a new solution for the development of the modular building industry, and have great market application potential.

[0054] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A prestressed composite structure modular building system, characterized in that: It comprises module units, each of which comprises four columns arranged in a rectangular shape, the upper ends of two adjacent columns are connected by a ceiling beam, and the lower ends are connected by a floor beam, and a prefabricated bottom plate is arranged at the web of the floor beam; The column comprises a column body and a column grouting cavity at both ends of the column body, a column steel pipe is arranged in the column grouting cavity, a column hole connected with the column steel pipe is arranged at the upper end of the column body, a horizontal prestressed tendon enters the column steel pipe and the space formed by the upper and lower flanges and the web of the ceiling beam through the column holes of the adjacent module units, a column grouting body is grouted in the column grouting space, and a beam grouting body is grouted in the space formed by the upper and lower flanges and the web of the floor beam; Beam holes are provided on the web of the ceiling beam, and horizontal prestressed tendons are installed in the beam holes. The same horizontal prestressed tendon is installed in the beam holes of two adjacent module units. The four module units located in the same layer are connected, and the same horizontal prestressed tendon is installed in the column holes of two adjacent module units and the space formed by the upper and lower flanges and web of the ceiling beam.

2. The prestressed composite structure modular building system according to claim 1 is characterized in that: A vertically arranged stud B is welded on the top surface of the upper flange of the ceiling beam, a vertically arranged stud A is welded on the bottom surface of the upper flange of the floor beam, and stud B mounting holes are opened on the lower flange at intervals; the lower end of the column-to-column connecting piece is inserted into the column of the module unit located on the lower layer, the upper end is inserted into the column of the module unit located on the upper layer, the middle connecting part is sandwiched between the module unit located on the upper layer and the module unit located on the lower layer, and the stud B of the module unit located on the lower layer is inserted into the stud B mounting hole of the module unit located on the upper layer.

3. The prestressed composite structure modular building system according to claim 1 is characterized in that: Column grouting holes and exhaust holes are arranged at the upper and lower ends of the column body.

4. The prestressed composite structure modular building system according to claim 1, characterized in that: The cross-sections of the ceiling beams and the floor beams are C-shaped, U-shaped or rectangular.

5. The prestressed composite structure modular building system according to claim 2, characterized in that: At the middle connection part of the column-column connector, the bolt B of the module unit located at the lower layer is inserted into the through hole of the middle connection part of the column-column connector and the mounting hole of the bolt B of the module unit located at the upper layer; at the middle connection part of the non-column-column connector, a high-strength grouting material is provided in the gap space formed by the floor beam of the module unit located at the upper layer and the ceiling beam of the module unit located at the lower layer.

6. The prestressed composite structure modular building system according to claim 5, characterized in that: The through holes of the same column-to-column connector are respectively sleeved on the pegs B of two adjacent module units.

7. A construction method for a prestressed composite structure modular building system, characterized in that: Utilizing the prestressed composite structure modular building system according to any one of claims 1 to 6, the construction method comprises: Factory-fabricated modular units; Assemble adjacent module units on the same floor on site, insert the same horizontal prestressed tendon into the column holes, column steel pipes and ceiling beams of the adjacent module units, and perform preliminary anchoring at both ends of the horizontal prestressed tendon; placing a column-to-column connector on a column of a module unit located at a lower level, and grouting a column grouting cavity at an upper portion of the column through a column grouting hole; Sleeve the column of the module unit located on the upper layer on the column-column connector, and pass the bolt B of the module unit located on the lower layer through the bolt B installation hole of the module unit located on the upper layer; at the middle connection part of the column-column connector, insert the bolt B of the module unit located on the lower layer into the through hole of the middle connection part of the column-column connector and the bolt B installation hole of the module unit located on the upper layer; insert the same horizontal prestressed tendon into the column hole, column steel pipe and ceiling beam of the adjacent module unit located on the upper layer, and preliminarily anchor the two ends of the horizontal prestressed tendon, and grout the column grouting cavity of the lower part of the column located on the upper layer through the column grouting hole; grout the space formed by the flange and web of the floor beam with high-strength grouting material, and fill the gap space between the ceiling beam and the floor beam through the bolt B installation hole; After the grouting material reaches the required strength, the horizontal prestressed tendons of the lower module units are tensioned to apply prestress, and the ends of the horizontal prestressed tendons are further anchored to achieve horizontal connection between the module units.

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