Connecting structure for prefabricated double beams and prefabricated double walls of concrete module building and construction method

Abstract

The invention discloses a connecting structure for prefabricated double beams and prefabricated double walls of a concrete module building and a construction method, the connecting structure comprises two prefabricated beams, a prefabricated partition wall and a laminated slab which are arranged in parallel in adjacent module units, and the prefabricated beam of each module unit and the prefabricated part of the laminated slab are integrally prefabricated and formed; the prefabricated beams and the prefabricated partition wall are connected through a semi-flexible connecting structure, a joint is arranged between the two prefabricated beams and the prefabricated partition wall, a waterproof adhesive tape used for blocking the joint is arranged in the joint of the two prefabricated beams, and the cast-in-place layer of the laminated plate and the beam plate node area are formed in a one-time pouring mode on site. The prefabricated beams and the prefabricated parts of the laminated slabs are integrally prefabricated and formed, and the cast-in-place layers of the laminated slabs and the beam slab node areas are jointly cast in place of concrete, so that every two adjacent prefabricated beams are combined into one beam, every two adjacent formwork units have good connection performance, the stress performance of the whole structure can be ensured, and the construction efficiency is improved. And meanwhile, the prefabricated beam and the prefabricated partition wall are connected through the semi-flexible connecting structure, the connecting performance is good, and the anti-seismic performance is improved.

Description

Technical Field

[0001] The invention belongs to the field of modular buildings, and in particular relates to a connection structure of prefabricated double beams and prefabricated double walls of a concrete modular building, and also relates to a construction method of the connection structure. Background Art

[0002] With the popularity of prefabricated concrete buildings, prefabricated concrete buildings are gradually developing towards modularization. Traditional prefabricated concrete buildings first prefabricate the main components in the factory, and then carry out a lot of installation and connection work on site, while modular concrete buildings first prefabricate the complete building module units in the factory, and even the decoration of the building module units can be made and perfected in the factory, and then transported to the site for a small amount of assembly work. Compared with traditional prefabricated concrete buildings, modular concrete buildings have the advantages of simplifying construction procedures, improving construction efficiency, and shortening construction periods, which can greatly promote the sustainable development of the construction industry.

[0003] The connection performance between building module units has a significant impact on the stress performance of the entire structure. If the connection performance is not good, it may lead to the separation of the module units, thus affecting the function of the modular building during normal use. At the same time, modular buildings are required to have certain seismic resistance so that under the action of horizontal seismic loads, the stiffness of the module units will not be too large, resulting in a sudden change in structural stiffness that is not conducive to seismic resistance.

[0004] Regarding the connection structure of the double beams and double walls of adjacent module units, Chinese patent application No. CN202411741021.9 discloses a connection structure of adjacent concrete modules, such as Figure 1 As shown, at least one building layer is composed of multiple concrete modules arranged in parallel. A concrete base plate 11 mold is cast with concrete, so that the ribs 12 are connected to the cast concrete base plate 11 during the casting process, and the building top plate is obtained by demoulding. The adjacent concrete formworks 13 on the adjacent concrete modules 1a enclose a beam casting space 15. A cast-in-place layer 16 of a building top plate is also provided above the building top plate, and the beam casting space 15 is connected to the cast-in-place layer 16 of the building top plate. The adjacent concrete modules are connected to form a building layer through the concrete beams cast in one piece and the cast-in-place layer 16 of the building top plate. The building top plate is connected to the module partition wall 14 through the concrete beams cast in the beam casting space 15. This connection structure has the following defects: the beam and the partition wall are connected only through the concrete cast-in-place area of ​​the beam. Although the connection surface between the partition wall and the beam is roughened, the connection performance is still poor.

[0005] In addition, the conventional joints between two prefabricated components are mainly for releasing deformation, lack the ability to actively regulate stiffness, and it is difficult to take into account both normal use and large earthquake performance requirements. The existing technology uses steel strands or shape memory alloys (SMA) to connect prefabricated components, which is costly and has strict requirements on construction accuracy, and is rarely used in engineering. In actual projects, structural joints are set at the inner ends of the partition walls to separate the partition walls and the shear walls, and tie bars that pass through the structural joints are usually extended into the prefabricated shear walls and prefabricated partition walls for connection. The tie bars are straight steel bars. This connection method has the following defects: This rigid connection method in which the tie bars are straight steel bars causes the shear wall and the partition wall to be completely fixed during normal use. Under the action of an earthquake, non-structural components are forced to participate in the force, the seismic inertia force is significantly increased, and the structure is prone to unexpected damage; and the straight steel bar connection lacks deformation capacity and cannot dissipate seismic energy through its own deformation. Summary of the invention

[0006] The first object of the present invention is to provide a connection structure of prefabricated double beams and prefabricated double walls of a concrete module building, which simplifies construction procedures, reduces construction costs, improves construction efficiency, has good connection performance, and improves seismic performance.

[0007] The first object of the present invention is achieved through the following technical measures: a connection structure of prefabricated double beams and prefabricated double walls of a concrete module building, characterized in that it includes two parallel prefabricated beams, prefabricated partition walls and composite panels of adjacent module units, the prefabricated beams of each module unit and the prefabricated parts of the composite panels are prefabricated and formed as one piece, and the prefabricated beams and prefabricated partition walls are connected by a semi-flexible connection structure, there are joints between the two prefabricated beams and the prefabricated partition walls, and a waterproof rubber strip for sealing the joints of the two prefabricated beams is provided in the joints of the two prefabricated beams, and the cast-in-place layer of the composite panel and the beam-slab node area are cast on site at one time.

[0008] The precast beams and the precast parts of the composite slab are integrally precast, and the cast-in-place layer of the composite slab and the beam-slab node area are cast-in-place with concrete, so that two adjacent precast beams are merged into one beam, so that the two adjacent mold units have good connection performance, which can ensure the stress performance of the overall structure. At the same time, the precast beams and the precast partition walls are connected by a semi-flexible connection structure, which has good connection performance and improved seismic resistance. The present invention can simplify the construction process, reduce construction costs, and improve construction efficiency.

[0009] The top surface of the precast beam of the present invention has a cast-in-place area, and the upper end opening of the joint is located on the bottom surface of the cast-in-place area of ​​the two spliced ​​precast beams. The cast-in-place area of ​​the precast beam and the cast-in-place layer and beam-slab node area of ​​the composite slab are cast on site at one time.

[0010] In the present invention, a flexible layer is provided between the prefabricated beam and the prefabricated partition wall of each module unit, and the vertical steel bars in the prefabricated partition wall extend upward and pass through the flexible layer to be anchored in the prefabricated beam to form a semi-flexible connection structure between the prefabricated beam and the prefabricated partition wall. When an earthquake occurs, the end faces of the prefabricated beam and the prefabricated partition wall can be separated and only connected by the vertical steel bars, thereby retaining a certain rigidity and improving the earthquake resistance.

[0011] The prefabricated partition wall of each module unit of the present invention is connected to the prefabricated shear walls on both sides thereof through a semi-flexible connection structure.

[0012] The semi-flexible connection structure between the prefabricated partition wall and the prefabricated shear wall described in the present invention includes a structural tie seam arranged at the inner end of the prefabricated partition wall, longitudinal positioning bars and transverse tie bars located on both sides of the structural tie seam, the transverse tie bars pass through the structural tie seam and the two ends thereof extend into the prefabricated partition wall and the prefabricated shear wall respectively, the two ends of the longitudinal positioning bars are connected to the transverse tie bars, the part of the transverse tie bars passing through the structural tie seam is a bent steel bar, and the diameter of the bent steel bar is greater than the diameter of the other parts of the transverse tie bars.

[0013] The semi-flexible connection structure between the prefabricated partition wall and the prefabricated shear wall described in the present invention includes a structural tie seam arranged at the inner end of the prefabricated partition wall, longitudinal positioning bars, transverse tie bars and bent steel bars located on both sides of the structural tie seam, the transverse tie bars pass through the structural tie seam and the two ends of which extend into the prefabricated partition wall and the prefabricated shear wall respectively, the two ends of the longitudinal positioning bars are connected to the transverse tie bars, the bent steel bars pass through the structural tie seam and the two ends of which are connected to the transverse tie bars, the part of the transverse tie bars located between the two ends of the bent steel bars is a fracture zone, and the diameter of the steel bars in the fracture zone is smaller than the diameter of other parts of the transverse tie bars.

[0014] The present invention arranges support negative bending moment steel bars, additional steel bars and plate surface steel bars in the beam-slab node area, and the plate surface steel bars are connected with the truss steel bars of the cast-in-place layer of the composite slab.

[0015] The flexible layer of the present invention is a grouting material or a joint material.

[0016] The second object of the present invention is to provide a construction method for the connection structure of the prefabricated double beams and prefabricated double walls of the above-mentioned concrete module building.

[0017] The second object of the present invention is achieved by the following technical measures: A construction method for the connection structure of the prefabricated double beams and prefabricated double walls of the above-mentioned concrete module building, characterized by comprising the following steps:

[0018] S1. Prefabricate each module unit in the factory;

[0019] S2, transporting the module unit to the construction site and hoisting two adjacent module units into place, leaving a seam between the two module units;

[0020] S3. Place the waterproof tape in the joint;

[0021] S4. Tie the negative moment reinforcement, additional reinforcement and slab surface reinforcement of the support in the beam-slab node area on site, and connect the slab surface reinforcement with the truss reinforcement of the cast-in-place layer of the composite slab; when the precast beam has a cast-in-place area, tie the longitudinal reinforcement of the upper part of the beam in the cast-in-place area at the same time;

[0022] S5, casting the cast-in-place layer and beam-slab node area of ​​the composite slab at one time; when the precast beam has a cast-in-place area, casting the cast-in-place area of ​​the precast beam at the same time;

[0023] S6. After the on-site pouring is completed, a mortar layer is set on the composite slab, and the upper module units are installed on the mortar layer.

[0024] In step S1 of the present invention, the prefabricated beams of the module unit and the prefabricated parts of the composite slab are cast at one time, the prefabricated partition wall and the prefabricated shear wall are connected by a semi-flexible connection structure and cast at one time, and then the prefabricated partition wall and the prefabricated beam are connected by a semi-flexible connection structure.

[0025] Compared with the prior art, the present invention has the following significant technical effects:

[0026] ⑴ The prefabricated beams and the prefabricated parts of the composite slab are prefabricated as a whole, and the cast-in-place layer of the composite slab and the beam-slab node area are cast-in-place concrete together, so that the double beams are combined into one beam body, which can meet the connection performance between modules and ensure the stress performance of the overall structure.

[0027] (2) The prefabricated partition wall and the prefabricated beam of the present invention are connected by a semi-flexible connection structure, which can be specifically connected by vertical steel bars, and a flexible layer is arranged between the prefabricated partition wall and the prefabricated beam. When an earthquake occurs, the end faces of the prefabricated beam and the prefabricated partition wall can be separated, and only rely on the vertical steel bars to be connected, retaining a certain rigidity. Therefore, the horizontal rigidity of this layer is reduced, and the floor shear force of this layer is also reduced, thereby preventing the occurrence of sudden changes in the rigidity of the upper and lower layers, and improving the seismic performance.

[0028] ⑶ The prefabricated partition wall and the prefabricated shear wall of the present invention are connected by a semi-flexible connection structure, which includes bent steel bars. When an earthquake occurs, the gradually straightened bent steel bars can exert their good elongation performance, continue the connecting force of the straight steel bars, and prevent the wall from falling off.

[0029] (4) The present invention can simplify the construction process, reduce construction costs, and improve construction efficiency, and is suitable for wide promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1It is an elevation view of a double beam and double wall connection structure of adjacent concrete modules in the prior art;

[0032] Figure 2 is a plan view of the concrete module building of the present invention;

[0033] Figure 3 is an elevation view of embodiment 1 of the present invention;

[0034] Figure 4 It is a schematic diagram of one embodiment of the semi-flexible connection structure between the prefabricated partition wall and the prefabricated shear wall of the present invention;

[0035] Figure 5 is a schematic diagram of another embodiment of the semi-flexible connection structure between the prefabricated partition wall and the prefabricated shear wall of the present invention;

[0036] Figure 6 It is a vertical view of embodiment 2 of the present invention.

[0037] In the figure: 1a-concrete module; 1-precast shear wall; 2-cast-in-place shear wall; 4-precast beam; 5-precast partition wall; 6-composite slab; 7-joint; 8-cast-in-place area; 9-waterproof strip; 10-cast-in-place layer; 11-concrete base plate; 11a-vertical steel bars; 12-ribs; 12a-flexible layer; 13-concrete formwork; 13a-support negative bending moment steel bars; 14-module partition wall; 14a-additional steel bars; 15-beam casting space; 15a-truss steel bars; 16-cast-in-place layer of building top slab; 16a-mortar layer; 17-upper module unit; 18-concrete module building; 19-structural joints; 20-longitudinal positioning bars; 21-transverse tie bars; 22-bent steel bars; 23-fracture zone. DETAILED DESCRIPTION

[0038] like Figure 2 As shown, the concrete module building 18 is formed by connecting a plurality of module units. M-1L and M-1R, M-2L and M-2R, M-3L and M-3R, M-4L and M-4R are two adjacent module units, which are arranged symmetrically to each other. The module units include shear walls (including cast-in-place shear walls 2 and precast shear walls 1), precast beams, precast partition walls 5, composite slabs, etc., wherein the composite slabs are composed of precast parts and cast-in-place layers.

[0039] Example 1

[0040] like Figure 3As shown, a connection structure of a prefabricated double beam and a prefabricated double wall of a concrete module building of the present invention comprises two prefabricated beams 4, a prefabricated partition wall 5 and a composite board 6 arranged in parallel in adjacent module units. The prefabricated beam 4 of each module unit and the prefabricated part of the composite board 6 are prefabricated and formed as a whole. A joint 7 with a width of 4 to 5 mm is provided between the two prefabricated beams 4 and the prefabricated partition wall 5. In this embodiment, the top surface of the prefabricated beam 4 has a cast-in-place area 8, and the upper end opening of the joint 7 is located on the bottom surface of the cast-in-place area 8 of the two spliced ​​prefabricated beams 4. A waterproof rubber strip 9 for sealing the joint is provided at the upper end opening of the joint 7. The waterproof rubber strip 9 extends along the length direction of the joint 7. The cast-in-place layer 10 of the composite board 6 and the cast-in-place area 8 and the beam-slab node area of ​​the prefabricated beam 4 are cast on site at one time to connect the two prefabricated beams 4 into one.

[0041] There is a joint between two adjacent module units of the present invention, and they are not completely close together, because the outer wall concrete of the module unit is not completely flat. If they are close together when connected with the adjacent modules, it may lead to loose fit and uneven stress. Therefore, a width of 4 to 5 mm is left between the two adjacent module units to make the stress uniform. Since the seismic load is borne by the shear wall, the prefabricated partition wall does not bear the seismic load, and it only needs to bear a certain vertical load. Therefore, if the joint is not processed, it will not affect the stress performance of the overall structure.

[0042] Support negative bending moment reinforcement 13a, additional reinforcement 14a and slab surface reinforcement are arranged in the beam-slab node area, and the slab surface reinforcement is connected to the truss reinforcement 15a of the cast-in-place layer 10 of the composite slab 6.

[0043] The prefabricated beam 4 and the prefabricated partition wall 5 are connected by a semi-flexible connection structure. A flexible layer 12a is provided between the prefabricated beam 4 and the prefabricated partition wall 5. The flexible layer can be made of grouting material or joint material. The vertical steel bars 11a in the prefabricated partition wall 5 extend upward and pass through the flexible layer 12a to be anchored in the prefabricated beam 4 and meet a certain anchoring depth.

[0044] The main function of the prefabricated partition wall is to act as a partition wall. It can also bear certain vertical loads, but it does not serve as a lateral force resisting member. This requires that the partition wall cannot bear excessive horizontal loads when an earthquake occurs. To this end, the present invention sets a flexible layer between the prefabricated beam and the prefabricated partition wall. When an earthquake occurs, the prefabricated beam can be separated from the prefabricated partition wall. However, since the vertical steel bars in the partition wall are still anchored in the prefabricated beam, a certain degree of rigidity is retained. The purpose of this is that when an earthquake occurs, the prefabricated partition wall can be separated from the prefabricated beam, reducing the horizontal rigidity of the current layer, and also reducing the floor shear force of the current layer, preventing the occurrence of a sudden change in rigidity between the upper and lower layers, and improving the earthquake resistance.

[0045] The prefabricated partition wall 5 of each module unit is connected to the prefabricated shear wall 1 via a semi-flexible connection structure to improve the earthquake resistance.

[0046] like Figure 4 As shown in the figure, as one of the embodiments, the semi-flexible connection structure includes a structural seam 19 arranged at the inner end of the prefabricated partition wall 5, longitudinal positioning bars 20 and transverse tie bars 21 located on both sides of the structural seam 19, the structural seam 19 is an existing product, specifically a plasticized polyvinyl chloride profile, the transverse tie bar 21 passes through the structural seam 19 and its two ends extend into the prefabricated partition wall 5 and the prefabricated shear wall 1 respectively, the two ends of the longitudinal positioning bar 20 are connected (welded or tied) to the transverse tie bar 21, the part of the transverse tie bar 21 passing through the structural seam 19 is a bent steel bar 22, the bent steel bar 22 is S-shaped, the steel type of the bent steel bar 22 is higher, and the diameter of the bent steel bar 22 is greater than the diameter of the other parts of the transverse tie bar 21, and the bent steel bar 22 is welded with the other parts of the transverse tie bar 21. A plurality of transverse tie bars 21 with bent steel bars 22 are arranged side by side on the horizontal plane, and as a row, a plurality of rows of transverse tie bars 21 with bent steel bars 22 are arranged side by side on the vertical plane. The working principle of the semi-flexible connection structure is as follows: the S-shaped steel bar (bent steel bar 22) maintains an elastic bending state under a small earthquake, providing sufficient rigidity to ensure the coordinated work of the partition wall and the shear wall; when a large earthquake occurs, the S-shaped steel bar is gradually straightened, allowing the partition wall and the shear wall to slide relative to each other, actively reducing the structural rigidity, and effectively avoiding sudden changes in rigidity. The seismic force is released smoothly as the magnitude of the earthquake increases; the S-shaped steel bar is gradually straightened in the process of being subjected to gradually increasing loads, and the seismic energy is dissipated through plastic deformation and friction of the material.

[0047] like Figure 5As shown, as another embodiment, the semi-flexible connection structure includes a structural seam 19 arranged at the inner end of the prefabricated partition wall 5, longitudinal positioning bars 20 located on both sides of the structural seam 19, transverse tie bars 21 and S-shaped bent steel bars 22, the transverse tie bars 21 pass through the structural seam 19 and its two ends extend into the prefabricated partition wall 5 and the prefabricated shear wall 1 respectively, the two ends of the longitudinal positioning bars 20 are connected to the transverse tie bars 21 (welded or tied), the bent steel bars 22 pass through the structural seam 19 and its two ends are connected to the transverse tie bars 21, the part of the transverse tie bars 21 located between the two ends of the bent steel bars 22 is a fracture zone 23, the diameter of the steel bars in the fracture zone 23 is smaller than the diameter of the other parts of the transverse tie bars 21, the bent steel bars 22 are welded to the other parts of the transverse tie bars 21, and the steel bars in the fracture zone 23 are welded to the other parts of the transverse tie bars 21. Several transverse tie bars 21 with bent steel bars 22 are arranged side by side on the horizontal plane, and as a row, several rows of transverse tie bars 21 with bent steel bars 22 are arranged side by side on the vertical plane. The working principle of the semi-flexible connection structure is: when subjected to a small earthquake or in normal use, the straight steel bars (the steel bars in the fracture zone 23) play the role of tying the two together, and the load on the straight steel bars is relatively small. As the magnitude of the earthquake increases, the load brought by the earthquake becomes greater, and the straight steel bars gradually reach yield and are subsequently broken; at this time, the S-shaped steel bars begin to bear force and are straightened, so that the prefabricated shear wall and the prefabricated partition wall are not pulled off, and the S-shaped steel bars consume energy during the deformation process. In this embodiment, the steel type of the straight steel bars is lower than that of the S-shaped steel bars (that is, the strength is low), and it is necessary to ensure that the straight steel bars can reach the fracture limit during the stress process of a large earthquake, and at the same time ensure that they will not break under normal use and small earthquakes; and the diameters of the straight steel bars and the S-shaped steel bars in this embodiment can be smaller than the S-shaped steel bars in the above-mentioned embodiment.

[0048] A construction method for the connection structure of the prefabricated double beams and prefabricated double walls of the above-mentioned concrete module building comprises the following steps:

[0049] S1, prefabricated modular units in the factory;

[0050] The precast beam 4 and the precast part of the composite slab 6 of the module unit are cast at one time, and the end face of the precast part is flush with the side wall of the cast-in-place area of ​​the precast beam; the precast partition wall 5 and the precast shear wall 1 are connected through a semi-flexible connection structure and cast at one time, and then the protruding part of the vertical steel bar 11a of the precast partition wall 5 is anchored into the precast beam 4, and a flexible layer is arranged between the precast partition wall 5 and the precast beam 4, thereby completing the production of the semi-flexible connection structure between the precast partition wall 5 and the precast beam 4.

[0051] S2, transporting the module unit to the construction site and hoisting two adjacent module units into place, leaving a joint 7 between the two module units;

[0052] S3, placing the waterproof tape 9 at the upper opening of the seam 7;

[0053] S4, tie the negative moment steel bars 13a, additional steel bars 14a and slab surface steel bars of the beam-slab node area on site, connect the slab surface steel bars with the truss steel bars 15a of the cast-in-place layer 10 of the composite slab 6, and tie the longitudinal steel bars on the upper part of the beam in the cast-in-place area 8;

[0054] S5. Cast the cast-in-place layer 10 of the composite slab 6, the beam-slab node area and the cast-in-place area 8 of the precast beam 4 at one time.

[0055] S6. After the on-site pouring is completed, a mortar layer 16a is provided on the cast-in-place layer 10 of the composite slab 6, and the upper module unit 17 is further installed on the mortar layer 16a.

[0056] Example 2

[0057] like Figure 6 As shown, the difference between this embodiment and embodiment 1 is that the precast beam of embodiment 1 is a composite beam with a cast-in-place area, while the precast beam of this embodiment is a fully precast beam without a cast-in-place area. The fully precast beam and the precast part of the composite slab are prefabricated and formed as a whole, and the end face of the precast part is flush with the outer side face of the fully precast beam; when casting on site, the beam-slab node area and the cast-in-place layer 10 of the composite slab 6 are cast at one time.

[0058] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A connection structure of prefabricated double beams and prefabricated double walls of a concrete modular building, characterized in that: It comprises two prefabricated beams, prefabricated partition walls and composite panels arranged in parallel in adjacent module units. The prefabricated beams of each module unit are integrally prefabricated with the prefabricated parts of the composite panels. The prefabricated beams and prefabricated partition walls are connected by a semi-flexible connection structure. There are joints between the two prefabricated beams and the prefabricated partition walls. A waterproof adhesive strip for sealing the joints of the two prefabricated beams is provided in the joints of the two prefabricated beams. The cast-in-place layer and the beam-slab node area of ​​the composite panels are cast on site at one time.

2. The connection structure of the prefabricated double beam and prefabricated double wall of the concrete module building according to claim 1 is characterized by: The top surface of the precast beam has a cast-in-place area, the upper end opening of the joint is located on the bottom surface of the cast-in-place area of ​​the two spliced ​​precast beams, and the cast-in-place area of ​​the precast beam and the cast-in-place layer and beam-slab node area of ​​the composite slab are cast on site at one time.

3. The connection structure of the prefabricated double beam and prefabricated double wall of the concrete module building according to claim 2 is characterized by: A flexible layer is provided between the prefabricated beam and the prefabricated partition wall of each module unit, and the vertical steel bars in the prefabricated partition wall extend upward and pass through the flexible layer and are anchored in the prefabricated beam to form a semi-flexible connection structure between the prefabricated beam and the prefabricated partition wall.

4. The connection structure of the prefabricated double beam and prefabricated double wall of the concrete module building according to claim 3 is characterized by: The prefabricated partition wall of each module unit is connected to the prefabricated shear walls on both sides via a semi-flexible connection structure.

5. The connection structure of prefabricated double beams and prefabricated double walls of concrete modular buildings according to claim 4, characterized in that: The semi-flexible connection structure between the prefabricated partition wall and the prefabricated shear wall includes a structural tie seam arranged at the inner end of the prefabricated partition wall, longitudinal positioning bars and transverse tie bars located on both sides of the structural tie seam, the transverse tie bars pass through the structural tie seam and the two ends thereof extend into the prefabricated partition wall and the prefabricated shear wall respectively, the two ends of the longitudinal positioning bars are connected to the transverse tie bars, the part of the transverse tie bars passing through the structural tie seam is a bent steel bar, and the diameter of the bent steel bar is greater than the diameter of the other parts of the transverse tie bars.

6. The connection structure of prefabricated double beams and prefabricated double walls of concrete modular buildings according to claim 4, characterized in that: The semi-flexible connection structure between the prefabricated partition wall and the prefabricated shear wall includes a structural tie joint arranged at the inner end of the prefabricated partition wall, longitudinal positioning bars, transverse tie bars and bent steel bars located on both sides of the structural tie joint, the transverse tie bars pass through the structural tie joint and the two ends of which extend into the prefabricated partition wall and the prefabricated shear wall respectively, the two ends of the longitudinal positioning bars are connected to the transverse tie bars, the bent steel bars pass through the structural tie joint and the two ends of which are connected to the transverse tie bars, the part of the transverse tie bars located between the two ends of the bent steel bars is a fracture zone, and the diameter of the steel bars in the fracture zone is smaller than the diameter of other parts of the transverse tie bars.

7. The connection structure of prefabricated double beams and prefabricated double walls of concrete modular buildings according to claim 5 or 6, characterized in that: Negative moment reinforcement, additional reinforcement and slab surface reinforcement are arranged in the beam-slab node area, and the slab surface reinforcement is connected to the truss reinforcement of the cast-in-place layer of the composite slab.

8. The connection structure of prefabricated double beams and prefabricated double walls of concrete modular buildings according to claim 7, characterized in that: The flexible layer is a grouting material or a jointing material.

9. A construction method for the connection structure of the prefabricated double beams and prefabricated double walls of a concrete module building according to claim 1, characterized in that: The following steps are involved: S1. Prefabricate each module unit in the factory; S2, transporting the module unit to the construction site and hoisting two adjacent module units into place, leaving a seam between the two module units; S3. Place the waterproof tape in the joint; S4. Tie the negative moment reinforcement, additional reinforcement and slab surface reinforcement of the support in the beam-slab node area on site, and connect the slab surface reinforcement with the truss reinforcement of the cast-in-place layer of the composite slab; when the precast beam has a cast-in-place area, tie the longitudinal reinforcement of the upper part of the beam in the cast-in-place area at the same time; S5, casting the cast-in-place layer and beam-slab node area of ​​the composite slab at one time; when the precast beam has a cast-in-place area, casting the cast-in-place area of ​​the precast beam at the same time; S6. After the on-site pouring is completed, a mortar layer is set on the composite slab, and the upper module units are installed on the mortar layer.

10. The construction method according to claim 9, characterized in that: In step S1, the precast beams and precast parts of the composite slabs of the module units are cast at one time, the precast partition walls and precast shear walls are connected by a semi-flexible connection structure and cast at one time, and then the precast partition walls and precast beams are connected by a semi-flexible connection structure.

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