Connection Structure and Construction Method of Prefabricated Double Beams and Prefabricated Double Walls in Concrete Module Buildings

Abstract

The present invention discloses a connection structure and construction method for precast double beams and precast double walls in a concrete modular building, including two juxtaposed precast beams, precast partition walls and composite slabs of adjacent module units. The precast part of the precast beam and the composite slab of each module unit are integrally prefabricated and formed, and the precast beam and the precast partition wall are connected by a semi-flexible connection structure. There is a joint between the two precast beams and the precast partition wall, and a waterproof rubber strip for sealing the joint is provided in the joint of the two precast beams. The cast-in-place layer of the composite slab and the beam-slab joint area are cast in place at the site at one time. In the present invention, the precast part of the precast beam and the composite slab are integrally prefabricated and formed, and the cast-in-place layer of the composite slab and the beam-slab joint area are jointly cast with concrete, so that two adjacent precast beams are combined into one beam, enabling good connection performance between two adjacent module units, ensuring the mechanical performance of the overall structure. At the same time, the precast beam and the precast partition wall are connected by a semi-flexible connection structure, which has good connection performance and improves the seismic performance.

Description

Technical Field

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

[0002] With the popularization of precast concrete buildings, precast concrete buildings are gradually developing towards modularization. In traditional precast concrete buildings, the main components are prefabricated in the factory first, and then a large amount of installation and connection work is carried out on site. While in modular concrete buildings, complete building module units are prefabricated in the factory first, and even the decoration of the building module units can be completed in the factory, and then transported to the site for a small amount of assembly work. Compared with traditional precast concrete buildings, modular concrete buildings have the advantages of simplifying construction procedures, improving construction efficiency, shortening construction period, etc., and can greatly promote the sustainable development of the construction industry.

[0003] The connection performance between building module units has a significant impact on the mechanical performance of the entire structure. If the connection performance is not good, it may lead to the separation between 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 performance, 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 the structural stiffness, which is not conducive to seismic resistance.

[0004] For the connection structure of double beams and double walls of adjacent module units, a Chinese patent application with the application number CN202411741021.9 discloses a connection structure of adjacent concrete modules. As Figure 1 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-in-place concrete base plate 11 during the casting process, and the building roof plate is obtained after demolding. Adjacent concrete formwork shells 13 on adjacent concrete modules 1a enclose a beam casting space 15. There is also a cast-in-place layer 16 of the building roof plate above the building roof plate. The beam casting space 15 is communicated with the cast-in-place layer 16 of the building roof plate. Adjacent concrete modules are connected into a building layer through the integrally cast concrete beam and the cast-in-place layer 16 of the building roof plate. The building roof plate and the module partition wall 14 are connected through the concrete beam cast in the beam casting space 15. This connection structure has the following defects: The connection between the beam and the partition wall is only through the concrete in the beam cast-in-place area. Although the connection surface between the partition wall and the beam is chiseled, the connection performance is still not good.

[0005] In addition, the conventional joints between two precast components are mainly for releasing deformation, lacking the ability to actively control stiffness, and it is difficult to balance the requirements of normal use and seismic performance in large earthquakes. The existing technologies use steel strands or shape memory alloys (SMA) to connect precast components, which are costly and require strict construction precision, resulting in less engineering applications. In actual engineering, a structural expansion joint is set at the inner end of the partition wall to separate the partition wall and the shear wall, and usually, tie bars passing through the structural expansion joint extend into the precast shear wall and the precast partition wall for connection. The tie bars are straight steel bars. This connection method has the following defects: This rigid connection method with straight steel bars causes the shear wall and the partition wall to be completely fixed during normal use. Under earthquake action, the non-structural components are forced to participate in the force, significantly increasing the seismic inertial force and making the structure prone to unexpected damage; moreover, 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 for precast double beams and precast double walls of a concrete modular building, which simplifies the construction process, reduces the construction cost, improves the construction efficiency, has good connection performance, and improves the seismic performance.

[0007] The first object of the present invention is achieved by the following technical measures: A connection structure for precast double beams and precast double walls of a concrete modular building, characterized in that it includes two juxtaposed precast beams, a precast partition wall, and a composite slab of adjacent module units. The precast part of the precast beam and the composite slab of each module unit are integrally prefabricated and formed. And the precast beam and the precast partition wall are connected by a semi-flexible connection structure. There is a joint between the two precast beams and the precast partition wall, and a waterproof rubber strip for sealing the joint is provided in the joint of the two precast beams. The cast-in-place layer of the composite slab and the beam-slab joint area are cast in place at the site at one time.

[0008] The precast part of the precast beam and the composite slab of the present invention are integrally prefabricated and formed, and the cast-in-place layer of the composite slab and the beam-slab joint area are jointly cast with concrete, combining two adjacent precast beams into one beam, enabling good connection performance between two adjacent module units, ensuring the mechanical performance of the overall structure. At the same time, the precast beam and the precast partition wall are connected by a semi-flexible connection structure, with good connection performance and improved seismic performance; the present invention can simplify the construction process, reduce the construction cost, and improve the construction efficiency.

[0009] The top surface of the precast beam of the present invention has a cast-in-place area, and the upper 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, the cast-in-place layer of the composite slab, and the beam-slab joint area are cast in place at the site at one time.

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

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

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

[0013] The semi-flexible connection structure between the precast partition wall and the precast shear wall of the present invention includes a structural expansion joint provided at the inner end of the precast partition wall, longitudinal positioning steel bars, transverse tie bars and bent steel bars located on both sides of the structural expansion joint. The transverse tie bars pass through the structural expansion joint and extend into the precast partition wall and the precast shear wall at both ends respectively. The two ends of the longitudinal positioning steel bars are connected to the transverse tie bars. The bent steel bar passes through the structural expansion joint and its two ends are connected to the transverse tie bars. The part of the transverse tie bar located between the two ends of the bent steel bar 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 bar.

[0014] The present invention provides a support negative moment steel bar, additional steel bars and slab surface steel bars in the beam-slab joint area, and the slab surface steel bars are connected to the truss steel bars of the cast-in-place layer of the composite slab.

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

[0016] The second object of the present invention is to provide a construction method for the connection structure of the precast double beams and precast 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 precast double beams and precast double walls of the above-mentioned concrete module building, which is characterized by including the following steps:

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

[0019] S2. Transport the module units to the construction site and hoist two adjacent module units in place, leaving a joint between the two module units;

[0020] S3. Place the waterproof rubber strip in the joint;

[0021] S4. Tie the support negative moment reinforcement, additional reinforcement and slab surface reinforcement in the beam-slab joint 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 at the upper part of the beam in the cast-in-place area at the same time;

[0022] S5. Pour the cast-in-place layer of the composite slab and the beam-slab joint area at one time; when the precast beam has a cast-in-place area, pour the cast-in-place area of the precast beam at the same time;

[0023] S6. After completing the on-site pouring, set a mortar layer on the composite slab, and install the upper module unit on the mortar layer.

[0024] In step S1 of the present invention, the precast beam of the module unit and the precast part of the composite slab are cast integrally at one time. The precast partition wall and the precast shear wall are connected through a semi-flexible connection structure and cast integrally, and then the precast partition wall and the precast beam are connected through a semi-flexible connection structure.

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

[0026] (1) In the present invention, the precast beam and the precast part of the composite slab are integrally precast and formed, and the cast-in-place layer of the composite slab and the beam-slab joint area are jointly cast with concrete, so that the double beams are combined into one beam body, which can meet the connection performance between the modules and ensure the mechanical performance of the overall structure.

[0027] (2) In the present invention, the precast partition wall and the precast beam are connected through a semi-flexible connection structure, specifically through vertical steel bars, and a flexible layer is provided between the precast partition wall and the precast beam. When an earthquake occurs, the end faces of the precast beam and the precast partition wall can be separated, and only rely on the vertical steel bars for connection, retaining a certain stiffness. Therefore, the horizontal stiffness of this layer is reduced, and at the same time, the floor shear force of this layer is also reduced, preventing the situation of sudden change in stiffness between the upper and lower layers and improving the seismic performance.

[0028] (3) In the present invention, the precast partition wall and the precast shear wall are connected through a semi-flexible connection structure, and the structure includes bent steel bars. When an earthquake comes, the gradually straightened bent steel bars can exert their good elongation performance, continue the connection force of the straight steel bars, and at the same time prevent the wall from being thrown off.

[0029] (4) The present invention can simplify the construction process, reduce the construction cost, improve the construction efficiency, and is suitable for wide promotion and use. Description of the Drawings

[0030] The following further elaborates the present invention in detail in conjunction with the drawings and specific embodiments.

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

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

[0033] Figure 3 It 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 precast partition wall and the precast shear wall of the present invention;

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

[0036] Figure 6 It is an elevation 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 rubber strip; 10 - cast - in - place layer; 11 - concrete base plate; 11a - vertical steel bar; 12 - rib; 12a - flexible layer; 13 - concrete formwork; 13a - support negative moment steel bar; 14 - module partition wall; 14a - additional steel bar; 15 - beam casting space; 15a - truss steel bar; 16 - cast - in - place layer of building roof slab; 16a - mortar bedding layer; 17 - upper module unit; 18 - concrete module building; 19 - structural expansion joint; 20 - longitudinal positioning steel bar; 21 - transverse tie bar; 22 - bent steel bar; 23 - fracture zone. Detailed implementation manners

[0038] As Figure 2 shown, the concrete module building 18 is formed by connecting multiple module units. M - 1L and M - 1R, M - 2L and M - 2R, M - 3L and M - 3R, M - 4L and M - 4R are all adjacent two module units, and they are symmetrically arranged with respect to each other. The module unit includes shear walls (including the cast - in - place shear wall 2 and the precast shear wall 1), precast beams, precast partition walls 5, composite slabs, etc. Among them, the composite slab is composed of a precast part and a cast - in - place layer.

[0039] Embodiment 1

[0040] As Figure 3As shown in the figure, it is a connection structure of a precast double beam and a precast double wall for a concrete module building according to the present invention, including two juxtaposed precast beams 4, a precast partition wall 5 and a composite slab 6 of adjacent module units. The precast part of the precast beam 4 and the composite slab 6 of each module unit are integrally precast and formed. There is a joint 7 with a width of 4-5 mm between the two precast beams 4 and the precast partition wall 5. In this embodiment, the top surface of the precast beam 4 has a cast-in-place area 8. The upper opening of the joint 7 is located on the bottom surface of the cast-in-place area 8 of the two spliced precast beams 4. A waterproof rubber strip 9 for sealing the joint is provided at the upper 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 slab 6, the cast-in-place area 8 of the precast beam 4 and the beam-slab joint area are cast in place at the site to connect the two precast beams 4 into one body.

[0041] There is a joint between two adjacent module units of the present invention, and they are not completely in close contact because the exterior wall concrete of the module unit is not completely flat. When connected to an adjacent module, if they are in close contact, it may cause insufficient fitting and uneven stress. Therefore, a width of 4-5 mm is left between two adjacent module units, which can make the stress uniform. And since the seismic load is borne by the shear wall and the precast partition wall does not bear the seismic load and only needs to bear a certain vertical load, the joints do not need to be treated and have no impact on the mechanical properties of the overall structure.

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

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

[0044] The main function of the precast partition wall is to act as a partition wall. It can also bear a certain vertical load, but it is not used as a lateral force resisting member. This requires that when an earthquake occurs, the partition wall cannot bear too much horizontal load. For this reason, the present invention provides a flexible layer between the precast beam and the precast partition wall. When an earthquake occurs, the precast beam can be separated from the precast partition wall. However, since the vertical steel bars in the partition wall are still anchored in the precast beam, a certain stiffness is retained. The purpose of this is that when an earthquake occurs, the precast partition wall can be separated from the precast beam, reducing the horizontal stiffness of this layer and also reducing the floor shear force of this layer, preventing the situation of sudden change in stiffness between upper and lower layers and improving the seismic performance.

[0045] The precast partition wall 5 of each module unit is connected to the precast shear wall 1 through a semi-flexible connection structure to improve the seismic performance.

[0046] As shown Figure 4 In one embodiment, the semi-flexible connection structure includes a structural expansion joint 19 provided at the inner end of the precast partition wall 5, longitudinal positioning bars 20 and transverse tie bars 21 located on both sides of the structural expansion joint 19. The structural expansion joint 19 is an existing product, specifically made of plasticized polyvinyl chloride profiles. The transverse tie bars 21 pass through the structural expansion joint 19 and their two ends respectively extend into the precast partition wall 5 and the precast shear wall 1. The two ends of the longitudinal positioning bars 20 are connected (welded or tied) to the transverse tie bars 21. The part of the transverse tie bars 21 passing through the structural expansion joint 19 is a bent bar 22, and the bent bar 22 is in an S shape. The steel grade of the bent bar 22 is relatively high, and the diameter of the bent bar 22 is larger than the diameter of the other parts of the transverse tie bars 21. The bent bar 22 is welded to the other parts of the transverse tie bars 21. A number of transverse tie bars 21 with bent bars 22 are arranged side by side on a horizontal plane as a row, and a number of rows of transverse tie bars 21 with bent bars 22 are arranged side by side on a vertical plane. The working principle of this semi-flexible connection structure is as follows: The S-shaped steel bar (bent bar 22) remains in an elastic bending state under small earthquakes, providing sufficient stiffness to ensure the coordinated work of the partition wall and the shear wall; when a major earthquake occurs, the S-shaped steel bar gradually straightens, allowing the partition wall and the shear wall to relatively slide, actively reducing the structural stiffness, effectively avoiding stiffness mutations, and gradually releasing the seismic force as the earthquake magnitude increases; during the process of the S-shaped steel bar being subjected to a gradually increasing load, it gradually straightens, dissipating seismic energy through the plastic deformation and frictional action of the material.

[0047] As shown Figure 5As shown, as another embodiment, the semi-flexible connection structure includes a structural expansion joint 19 provided at the inner end of the precast partition wall 5, longitudinal positioning bars 20 located on both sides of the structural expansion joint 19, transverse tie bars 21, and S-shaped bent bars 22. The transverse tie bars 21 pass through the structural expansion joint 19 and its two ends respectively extend into the precast partition wall 5 and the precast shear wall 1. The two ends of the longitudinal positioning bars 20 are connected (welded or tied) to the transverse tie bars 21. The bent bars 22 pass through the structural expansion joint 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 bars 22 is the fracture zone 23. The diameter of the steel bars in the fracture zone 23 is smaller than that of the other parts of the transverse tie bars 21. The bent bars 22 are welded together with the other parts of the transverse tie bars 21. The steel bars in the fracture zone 23 are welded together with the other parts of the transverse tie bars 21. A number of transverse tie bars 21 with bent bars 22 are arranged side by side on the horizontal plane as a row, and a number of rows of transverse tie bars 21 with bent bars 22 are arranged side by side on the vertical plane. The working principle of this semi-flexible connection structure is as follows: when subjected to minor earthquakes or normal use conditions, the straight steel bars (the steel bars in the fracture zone 23) play a role in tying the two together, and the load on the straight steel bars is relatively small. As the earthquake magnitude increases, the load brought by the earthquake becomes greater, and the straight steel bars gradually reach yield and are subsequently pulled apart. At this time, the S-shaped steel bars start to bear force and are straightened, so that the precast shear wall and the precast partition wall are not pulled off, and the S-shaped steel bars dissipate energy during the deformation process. In this embodiment, the steel bar type of the straight steel bars is lower (i.e., the strength is lower) than that of the S-shaped steel bars, and it is necessary to ensure that the straight steel bars can reach the fracture limit during the force-bearing process of major earthquakes, while ensuring that they will not break under normal use and minor earthquakes; and the diameter ratio of the straight steel bars to the S-shaped steel bars in this embodiment can be smaller than that of the S-shaped steel bars in the above embodiment.

[0048] A construction method for the connection structure of the precast double beams and precast double walls of the above concrete module building includes the following steps:

[0049] S1. Prefabricate module units in the factory;

[0050] Pour the precast part of the precast beam 4 and the composite slab 6 of the module unit 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. Then connect the precast partition wall 5 and the precast shear wall 1 through the semi-flexible connection structure and form them by pouring at one time. Then anchor the extended part of the vertical steel bars 11a of the precast partition wall 5 into the precast beam 4, and set a flexible layer between the precast partition wall 5 and the precast beam 4 to complete the production of the semi-flexible connection structure between the precast partition wall 5 and the precast beam 4.

[0051] S2. Transport the module units to the construction site and hoist two adjacent module units in place, and leave a joint 7 between the two module units;

[0052] S3. Place the waterproof rubber strip 9 at the upper opening of the joint 7;

[0053] S4. Tie the support negative moment steel bars 13a, additional steel bars 14a and slab surface steel bars in the beam-slab joint 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 at the upper part of the beam in the cast-in-place area 8 at the same time.

[0054] S5. Pour the cast-in-place layer 10 of the composite slab 6, the beam-slab joint 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, set a mortar layer 16a on the cast-in-place layer 10 of the composite slab 6, and continue to install the upper module unit 17 on the mortar layer 16a.

[0056] Embodiment 2

[0057] As Figure 6 shown, the difference between this embodiment and Embodiment 1 is that: the precast beam in Embodiment 1 is a composite beam with a cast-in-place area, while the precast beam in this embodiment is a fully precast beam without a cast-in-place area. The precast part of the fully precast beam and the composite slab are integrally precast and formed, and the end face of the precast part is flush with the outer side face of the fully precast beam; during on-site pouring, the beam-slab joint area and the cast-in-place layer 10 of the composite slab 6 are poured at one time.

[0058] The above embodiments only illustratively explain the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A connecting structure for precast double beams and precast double walls in a concrete module building, characterized in that: Two juxtaposed precast beams, precast partition walls and composite slabs including adjacent module units. The precast part of the precast beam and the composite slab of each module unit are integrally precast. The precast beam and the precast partition wall are connected by a semi-flexible connection structure. There is a joint between the two precast beams and the precast partition wall, and a waterproof rubber strip for sealing the joint is provided in the joint of the two precast beams. The cast-in-place layer of the composite slab and the beam-slab joint area are cast in place at the site at one time. There is a cast-in-place area on the top surface of the precast beam. 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, the cast-in-place layer of the composite slab and the beam-slab joint area are cast in place at the site at one time. A flexible layer is provided between the precast beam and the precast partition wall of each module unit, and the vertical steel bars in the precast partition wall extend upward and pass through the flexible layer and are anchored in the precast beam to form a semi-flexible connection structure between the precast beam and the precast partition wall. The flexible layer is grouting material or joint material.

2. The connecting structure of the precast double beams and precast double walls of the concrete module building according to claim 1, wherein: The precast partition wall of each module unit is connected to the precast shear walls on both sides of it by a semi-flexible connection structure.

3. The connecting structure of the precast double beams and precast double walls of the concrete module building according to claim 2, characterized in that: The semi-flexible connection structure between the precast partition wall and the precast shear wall includes a structural expansion joint provided at the inner end of the precast partition wall, longitudinal positioning bars and transverse tie bars located on both sides of the structural expansion joint. The transverse tie bars pass through the structural expansion joint and its two ends extend into the precast partition wall and the precast shear wall respectively. The two ends of the longitudinal positioning bars are connected to the transverse tie bars. The part of the transverse tie bar passing through the structural expansion joint is a bent steel bar, and the diameter of the bent steel bar is larger than the diameter of other parts of the transverse tie bar.

4. The connecting structure of the precast double beams and precast double walls of the concrete module building according to claim 2, characterized in that: The semi-flexible connection structure between the precast partition wall and the precast shear wall includes a structural expansion joint provided at the inner end of the precast partition wall, longitudinal positioning bars, transverse tie bars and bent steel bars located on both sides of the structural expansion joint. The transverse tie bars pass through the structural expansion joint and its two ends extend into the precast partition wall and the precast shear wall respectively. The two ends of the longitudinal positioning bars are connected to the transverse tie bars. The bent steel bar passes through the structural expansion joint and its two ends are connected to the transverse tie bars. The part of the transverse tie bar located between the two ends of the bent steel bar 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 bar.

5. The connecting structure of the precast double beams and precast double walls of the concrete module building according to claim 3 or 4, characterized in that: Support negative moment steel bars, additional steel bars and slab surface steel bars are arranged in the beam-slab joint area, and the slab surface steel bars are connected to the truss steel bars of the cast-in-place layer of the composite slab.

6. A construction method of the connection structure between the precast double beams and precast double walls of the concrete module building described in claim 1, characterized in that Including the following steps: S1. Prefabricate each module unit in the factory; S2. Transport the module units to the construction site and hoist two adjacent module units in place, leaving a joint between the two module units; S3. Place the waterproof rubber strip in the joint; S4. Bind the support negative moment steel bars, additional steel bars and slab surface steel bars in the beam-slab joint area on site, and connect the slab surface steel bars to the truss steel bars of the cast-in-place layer of the composite slab; when the precast beam has a cast-in-place area, simultaneously bind the longitudinal steel bars at the upper part of the beam in the cast-in-place area; S5. Cast the cast-in-place layer of the composite slab and the beam-slab joint area at one time; when the precast beam has a cast-in-place area, simultaneously cast the cast-in-place area of the precast beam; S6. After completing the on-site casting, set a mortar layer on the composite slab, and install the upper module unit on the mortar layer.

7. The construction method according to claim 6, characterized in that: In step S1, the precast beam of the modular unit and the precast part of the composite slab are cast in one go. The precast partition wall and the precast shear wall are connected by a semi-flexible connection structure and cast into a whole in one go, and then the precast partition wall and the precast beam are connected by a semi-flexible connection structure.

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