Novel opposite-pull connecting structure suitable for modular building and construction method
By incorporating a built-in concealed tie-and-pull connection structure, the problems of surface damage and low construction efficiency in the construction of modular building cast-in-place structures are solved, achieving efficient and stable construction results that are suitable for high prefabrication rates and fine decoration requirements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA CONSTRUCTION HAILONG (BEIJING) TECHNOLOGY CO LTD
- Filing Date
- 2026-03-20
- Publication Date
- 2026-05-12
AI Technical Summary
The existing construction of modular building cast-in-place structures suffers from problems such as damage to prefabricated decorative surfaces, large workload of on-site formwork, low construction efficiency, many potential quality hazards, and high maintenance costs, making it difficult to meet the requirements of high prefabrication rates and high-end interior decoration delivery.
The system adopts a built-in concealed tie rod connection structure. By reserving tie rod components during the factory prefabrication stage, the tie rod bolts are hidden in the gap between the modular wall and the cast-in-place structure. The modular precast concrete thin-shell wall formwork is used as the cast-in-place side formwork to replace the traditional wooden formwork, achieving tie rod fixing without drilling.
It avoids damage to the prefabricated decorative surface layer, simplifies the construction process, improves construction efficiency and quality stability, conforms to the concept of green building, reduces on-site formwork erection and dismantling procedures, and reduces labor and time costs.
Smart Images
Figure CN122013915A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a novel tie-connection structure and construction method suitable for modular buildings, belonging to the field of modular building construction. Background Technology
[0002] Modular construction, with its advantages of high prefabrication rate, short construction cycle, and green environmental protection, has become an important development direction for the transformation and upgrading of the construction industry. Among them, concrete modular construction (MIC) is increasingly widely used in residential and commercial buildings due to its strong structural stability and wide applicability. During the construction of concrete modular construction, cast-in-place structures such as columns and walls are usually required between adjacent prefabricated module units to achieve reliable connection between modules and ensure the structural integrity and stability of the overall building.
[0003] In existing modular building cast-in-place structure construction technology, to ensure the stability of the formwork system during the concrete pouring process and avoid quality problems such as formwork bulging and grout leakage, tie rod connections are commonly used to secure the formwork on both sides. Currently, the most widely used tie rod connection technology involves creating through holes in the side walls of the modular wall, and then using tie rods to pass through these holes to achieve tie rod fastening. Simultaneously, wooden or steel formwork is used as the cast-in-place side formwork, working in conjunction with the tie rod structure to withstand the pressure of the poured concrete.
[0004] However, the aforementioned existing technical solutions have many problems that urgently need to be solved in practical applications:
[0005] Firstly, traditional tie rod connections require openings in the side walls of modular walls (i.e., the side where the finished surface layer has been completed during the prefabrication stage). However, prefabricated modules of concrete modular buildings typically have already undergone finishing processes such as tile laying and putty painting in the factory. Opening holes in the side walls would directly damage the prefabricated finished surface layer, resulting in additional repair work later. This not only increases construction costs and time, but also makes it difficult to ensure that the repaired decoration effect is consistent with the original prefabricated surface layer, which contradicts the development requirements of high prefabrication rate and high-end decoration delivery of modular buildings.
[0006] Secondly, existing technologies mostly use independent wooden or steel formwork as cast-in-place side formwork, which requires a large amount of formwork erection, installation and dismantling work on the construction site. The process is complicated and the workload is large, which significantly reduces construction efficiency. In addition, the rigidity of the wooden formwork itself is insufficient, and under the pressure of concrete pouring, it is prone to quality problems such as formwork bulging and grout leakage, which affects the quality of cast-in-place structure formation.
[0007] Third, traditional tie bolt installation relies on on-site drilling for positioning, which makes it difficult to guarantee the accuracy of the hole position, easily leading to uneven stress on the tie bolt. Furthermore, the tie bolt and its supporting components such as nuts and washers need to be removed in the later stages of construction, and the holes need to be sealed and repaired after removal, which further increases the workload of construction and subsequent maintenance, and reduces the convenience of construction.
[0008] In summary, the existing tie-joint connection technology in the construction of cast-in-place modular building structures has problems such as damage to the precast decorative surface layer, large workload of on-site formwork, low construction efficiency, many hidden dangers in cast-in-place quality, and high maintenance costs. These problems restrict the construction quality and promotion and application of concrete modular buildings. Therefore, developing a tie-joint connection structure and construction method that can adapt to the high prefabrication rate of modular buildings, simplify the construction process, and ensure construction quality has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0009] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a novel tie-connection structure and construction method suitable for modular buildings, which is a modular building tie-connection solution that does not require damage to the prefabricated decoration surface layer, simplifies the formwork system, and improves construction efficiency and quality stability, thereby effectively solving the above-mentioned defects of the prior art and meeting the actual needs of efficient and high-quality construction of concrete modular buildings.
[0010] The present invention discloses a novel tie-connection structure suitable for modular buildings. The tie-connection structure is detachably connected between an outer precast wall formwork and an inner precast wall formwork to achieve tie-fixation. The outer and inner precast wall formworks are arranged opposite to each other, and a cast-in-place space is formed between them. Truss reinforcement is pre-embedded in the outer precast wall formwork. The tie-connection structure is characterized by comprising a tie rod, a pre-embedded truss reinforcement nut welded to the truss reinforcement, and an anchoring steel plate pre-embedded in the inner precast wall formwork. One end of the tie rod is threadedly connected to the pre-embedded truss reinforcement nut, and the other end of the tie rod passes through the anchoring steel plate and is threadedly connected to a positioning nut.
[0011] By pre-installing tie rods in the factory prefabrication stage, the tie rods are completely hidden in the gap between the modular wall and the cast-in-place structure. Adjacent modular walls are horizontally fastened through built-in tie rods to form a stable cast-in-place space. At the same time, the modular wall formwork itself is used as part of the cast-in-place formwork to replace the traditional wooden formwork.
[0012] It adopts a built-in hidden pull-out design, eliminating the need to drill holes on the side of the modular wall decoration surface, thus avoiding the damage to prefabricated tiles, putty and other decoration surfaces caused by traditional pull-out methods, and perfectly adapting to the high prefabrication requirements of modular buildings.
[0013] By directly using modular precast concrete thin-shell wall formwork as cast-in-place side formwork to replace traditional wooden formwork, the on-site formwork erection and dismantling procedures are greatly reduced, the construction process is simplified, labor and time costs are reduced, and construction efficiency is significantly improved, which is in line with the new development concept of green building.
[0014] In any of the above embodiments, it is preferred that the truss reinforcement includes a lower chord reinforcement embedded in the outer precast wall formwork and an upper chord reinforcement located outside the outer precast wall formwork, wherein the lower chord reinforcement and the upper chord reinforcement are connected by web reinforcement.
[0015] In any of the above embodiments, it is preferred that the web reinforcement bars are inclined and that both ends of the web reinforcement bars are welded to the upper chord reinforcement bars and the lower chord reinforcement bars respectively, and that the pre-embedded truss reinforcement nuts are welded to the connection between the web reinforcement bars and the upper chord reinforcement bars.
[0016] In any of the above embodiments, it is preferred that a pressure-bearing washer is provided between the positioning nut and the anchoring steel plate, and the tie rod passes through the anchoring steel plate, the pressure-bearing washer and the positioning nut in sequence.
[0017] In any of the above embodiments, it is preferred that additional longitudinal ribs are pre-embedded in the inner precast wall formwork and welded to the anchoring steel plate, and a groove is also provided to cooperate with the anchoring steel plate. The anchoring steel plate is located at the bottom of the groove and on the side of the inner precast wall formwork closer to the outer precast wall formwork.
[0018] In any of the above embodiments, it is preferred that four additional longitudinal ribs are spaced apart, two additional longitudinal ribs are welded to each end of the anchoring steel plate, the middle part of the additional longitudinal ribs is welded to the anchoring steel plate, and the two ends of the additional longitudinal ribs are connected to the extension section in the inner precast wall formwork through a bent section.
[0019] In any of the above embodiments, it is preferred that the additional longitudinal ribs are an integral structure and the grooves are filled with plaster.
[0020] In any of the above embodiments, it is preferred that the tie-connection structure is distributed in a rectangular array between the outer precast wall formwork and the inner precast wall formwork.
[0021] The construction method for the novel tie-connection structure applicable to modular buildings includes the following steps:
[0022] S1. Factory prefabrication preparation: During the factory prefabrication stage, ensure that the position and size of the truss reinforcement welding nuts and the longitudinal rib anchoring steel plate holes are accurately matched.
[0023] S2. Module hoisting and positioning: Hoist the prefabricated modular building units to the designated construction position, adjust the verticality and spacing of adjacent units, and align the tie rods of adjacent wall forms.
[0024] S3. For the installation of the built-in tie rod assembly, first pass one end of the tie rod through the longitudinal rib and insert it into the pre-embedded truss nut of the wall formwork truss reinforcement of another module. Then install the bearing pad and positioning nut on the other end in sequence. The lateral tie-and-fix of the adjacent walls is achieved by tightening the nuts.
[0025] S4. Cast-in-place concrete pouring: Pour concrete into the cast-in-place area between adjacent modular walls, using the wall formwork as a side formwork to bear the pouring pressure.
[0026] S5. Post-construction treatment: After the concrete reaches the design strength, without removing the positioning nuts and bearing washers, fill and modify the grooves of the longitudinal ribs to complete the construction.
[0027] In any of the above schemes, the specific steps of the factory prefabrication preparation in step S1 are as follows: S11, pre-embed truss bars 1 in the outer prefabricated wall formwork 6 and weld the pre-embedded truss bar nuts 2; S12, pre-set additional longitudinal rib bars 9 and anchoring steel plates 4 in the inner prefabricated wall formwork 7; S13, check the position and size matching.
[0028] In any of the above schemes, the preferred method is that the specific steps of module hoisting and positioning in step S2 are as follows: S21, hoist the outer precast wall formwork 6 and inner precast wall formwork 7 of the precast module to the designated work position; S22, adjust the verticality and spacing of the outer precast wall formwork 6 and inner precast wall formwork 7; S23, align the pre-embedded truss bar nuts 2 with the opening positions of the anchor steel plate 4.
[0029] In any of the above schemes, the specific steps for installing the built-in tie rod assembly in step S3 are as follows: S31, the tie rod 3 is connected to the pre-embedded truss bar nut 2; S32, the pressure-bearing gasket is installed to fit the anchoring steel plate; S33, the tie rod 3 is connected to the positioning nut 5, and the positioning nut is tightened to lock and fix it.
[0030] In any of the above schemes, the specific steps for pouring the cast-in-place concrete in step S4 are as follows: using modular wall molds as side molds, pouring and vibrating the concrete.
[0031] In any of the above schemes, the specific steps of the post-processing described in step S5 are as follows: S51, the concrete is cured to the standard and the design strength standard is met; S52, the groove 10 is filled and decorated without removing the tie rod assembly, and the surface is finished after filling the groove; S53, the construction is completed.
[0032] Compared with existing technologies, this invention has the following advantages: it protects prefabricated decorative surfaces and improves adaptability. The novel tie-connection structure and construction method for modular buildings described in this invention reduce on-site formwork work and improve construction efficiency. It simplifies the construction process and improves operational convenience. It ensures the quality of cast-in-place concrete and enhances structural stability. Attached Figure Description
[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0034] Figure 1 A diagram illustrating the usage status of a novel tie-connection structure suitable for modular buildings;
[0035] Figure 2 This is a schematic diagram of the truss reinforcement arrangement.
[0036] Figure 3 A structural diagram of a novel tie-connection structure suitable for modular buildings;
[0037] Figure 4 Drawings showing the addition of transverse structural reinforcement at the truss tie points;
[0038] Figure 5 Structure for anchoring steel plates Figure 1 ;
[0039] Figure 6 Structure for anchoring steel plates Figure 2 ;
[0040] Figure 7 A flowchart illustrating the construction method for a novel tie-connection structure suitable for modular buildings.
[0041] In the diagram: 1. Truss reinforcement; 1.1. Bottom chord reinforcement; 1.2. Top chord reinforcement; 1.3. Web reinforcement; 2. Embedded truss reinforcement nut; 3. Tie rod; 4. Anchoring steel plate; 5. Positioning nut; 6. External precast wall formwork; 7. Internal precast wall formwork; 8. Bearing gasket; 9. Additional longitudinal rib reinforcement; 10. Groove. Detailed Implementation
[0042] The present invention will now be further described with reference to the accompanying drawings:
[0043] The present invention will be further illustrated by specific embodiments below, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
[0044] Example 1, as Figure 1-2As shown, a novel tie-connection structure and construction method suitable for modular buildings are described. The tie-connection structure is detachably connected between the outer precast wall formwork 6 and the inner precast wall formwork 7 to achieve tie-fixation. The outer precast wall formwork 6 and the inner precast wall formwork 7 are arranged opposite to each other, and a cast-in-place space is formed between the outer precast wall formwork 6 and the inner precast wall formwork 7. Truss reinforcement 1 is pre-embedded in the outer precast wall formwork 6. The tie-connection structure includes tie rods 3, pre-embedded truss reinforcement nuts 2 welded to the truss reinforcement 1, and anchoring steel plates 4 pre-embedded in the inner precast wall formwork 7. One end of the tie rod 3 is threadedly connected to the pre-embedded truss reinforcement nut 2, and the other end of the tie rod 3 passes through the anchoring steel plate 4 and is threadedly connected to the positioning nut 5.
[0045] The design adopts a "built-in hidden tie rod" design, which eliminates the need to drill holes in the side wall (the side with the finished surface layer) of the modular wall. The tie rod components are reserved in the factory prefabrication stage, so that the tie rod bolts are completely hidden in the gap between the modular wall and the cast-in-place structure. Adjacent modular walls are horizontally fastened through the built-in tie rod components to form a stable cast-in-place space. At the same time, the modular wall formwork itself is used as part of the cast-in-place formwork, replacing the traditional wooden formwork.
[0046] It adopts a built-in hidden pull-out design, eliminating the need to drill holes on the side of the modular wall decoration surface, thus avoiding the damage to prefabricated tiles, putty and other decoration surfaces caused by traditional pull-out methods, and perfectly adapting to the high prefabrication requirements of modular buildings.
[0047] By directly using modular precast concrete thin-shell wall formwork as cast-in-place side formwork to replace traditional wooden formwork, the on-site formwork erection and dismantling procedures are greatly reduced, the construction process is simplified, labor and time costs are reduced, and construction efficiency is significantly improved, which is in line with the new development concept of green building.
[0048] Example 2, as Figure 1-6 As shown, a novel tie-connection structure and construction method suitable for modular buildings are described. The tie-connection structure is detachably connected between the outer precast wall formwork 6 and the inner precast wall formwork 7 to achieve tie-fixation. The outer precast wall formwork 6 and the inner precast wall formwork 7 are arranged opposite to each other, and a cast-in-place space is formed between the outer precast wall formwork 6 and the inner precast wall formwork 7. Truss reinforcement 1 is pre-embedded in the outer precast wall formwork 6. The tie-connection structure includes tie rods 3, pre-embedded truss reinforcement nuts 2 welded to the truss reinforcement 1, and anchoring steel plates 4 pre-embedded in the inner precast wall formwork 7. One end of the tie rod 3 is threadedly connected to the pre-embedded truss reinforcement nut 2, and the other end of the tie rod 3 passes through the anchoring steel plate 4 and is threadedly connected to the positioning nut 5.
[0049] Furthermore, the truss reinforcement 1 includes a lower chord reinforcement 1.1 embedded in the outer precast wall formwork 6 and an upper chord reinforcement 1.2 located outside the outer precast wall formwork 6. The lower chord reinforcement 1.1 and the upper chord reinforcement 1.2 are connected by web reinforcement 1.3.
[0050] Furthermore, the web reinforcement 1.3 is inclined, and both ends of the web reinforcement 1.3 are welded to the upper chord reinforcement 1.2 and the lower chord reinforcement 1.1 respectively. The pre-embedded truss reinforcement nut 2 is welded at the connection between the web reinforcement 1.3 and the upper chord reinforcement 1.2.
[0051] Furthermore, a pressure-bearing washer 8 is provided between the positioning nut 5 and the anchoring steel plate 4, and the tie rod 3 passes through the anchoring steel plate 4, the pressure-bearing washer 8 and the positioning nut 5 in sequence.
[0052] Furthermore, the inner precast wall formwork 7 is pre-embedded with additional longitudinal rib steel bars 9 that are welded to the anchoring steel plate 4, and a groove 10 that cooperates with the anchoring steel plate 4 is also provided. The anchoring steel plate 4 is located at the bottom of the groove 10 and is located on the side of the inner precast wall formwork 7 that is close to the outer precast wall formwork 6.
[0053] Furthermore, four additional longitudinal ribs 9 are spaced apart, and two additional longitudinal ribs 9 are welded to each end of the anchoring steel plate 4. The middle part of the additional longitudinal ribs 9 is welded to the anchoring steel plate 4, and the two ends of the additional longitudinal ribs 9 are connected to the extension section in the inner precast wall formwork 7 through a bent section.
[0054] Furthermore, the additional longitudinal rib steel bar 9 is an integral structure, and the groove 10 is filled with plaster.
[0055] Furthermore, the tie-connection structure is arranged in a rectangular array between the outer precast wall formwork 6 and the inner precast wall formwork 7.
[0056] Example 3, the construction method of the novel tie-connection structure applicable to modular buildings, includes the following steps: S1, factory prefabrication preparation, ensuring precise matching of the position and size of the truss reinforcement welding nuts and the longitudinal rib anchoring steel plate holes during the factory prefabrication stage; S2, module hoisting and positioning, hoisting the prefabricated modular building units to the designated construction position, adjusting the verticality and spacing of adjacent units to align the tie-connection components of adjacent wall forms; S3, installation of built-in tie-connection components, first inserting one end of the tie rod through the longitudinal rib into the pre-embedded truss reinforcement nut of the truss reinforcement of another module wall form, and then sequentially installing the bearing pad and positioning nut at the other end, achieving lateral tie-connection fixation of adjacent walls through nut tightening; S4, cast-in-place concrete pouring, pouring concrete into the cast-in-place area between adjacent modular walls, using the wall form as a side form to bear the pouring pressure; S5, post-processing, after the concrete reaches the design strength, without removing the positioning nut and bearing pad, filling and modifying the longitudinal rib grooves to complete the construction.
[0057] Example 4, refer to Figure 7The construction method for the novel tie-connection structure applicable to modular buildings, the specific steps of the factory prefabrication preparation in step S1 are as follows: S11, pre-embed truss bars 1 in the outer prefabricated wall formwork 6 and weld the pre-embedded truss bar nuts 2; S12, pre-set additional longitudinal rib bars 9 and anchoring steel plates 4 in the inner prefabricated wall formwork 7; S13, check the position and size matching.
[0058] The specific steps for module hoisting and positioning in step S2 are as follows: S21, hoist the outer precast wall formwork 6 and inner precast wall formwork 7 of the precast module to the designated work position; S22, adjust the verticality and spacing of the outer precast wall formwork 6 and inner precast wall formwork 7; S23, align the pre-embedded truss reinforcement nut 2 with the opening position of the anchoring steel plate 4.
[0059] The specific steps for installing the built-in tie rod assembly described in step S3 are as follows: S31, connect the tie rod 3 to the pre-embedded truss bar nut 2; S32, install the bearing gasket to fit the anchoring steel plate; S33, connect the tie rod 3 to the positioning nut 5, and tighten the positioning nut to lock and fix it.
[0060] The specific steps for pouring concrete in the cast-in-place area described in step S4 are as follows: using modular wall molds as side molds, pouring and vibrating concrete;
[0061] The specific steps of the post-processing described in step S5 are as follows: S51, the concrete is cured to the standard and the design strength standard is met; S52, the groove 10 is filled and decorated without removing the tie rod assembly, and the surface is finished after filling the groove; S53, the construction is completed.
[0062] The novel tie-connection structure and construction method for modular buildings described in this invention adopts a built-in hidden tie-connection design, eliminating the need for opening holes on the decorative surface of the modular wall, thus avoiding the damage to precast tiles, putty and other decorative surfaces caused by traditional tie-connection methods, and perfectly meeting the high prefabrication requirements of modular buildings.
[0063] The novel tie-connection structure and construction method for modular buildings described in this invention directly utilizes modular precast concrete thin-shell wall formwork as cast-in-place side formwork, replacing traditional wooden formwork. This significantly reduces on-site formwork erection and dismantling procedures, simplifies the construction process, reduces labor and time costs, and significantly improves construction efficiency, aligning with the new development concept of green building.
[0064] The novel tie-connection structure and construction method for modular buildings described in this invention eliminates the need for drilling holes on the formwork site when installing the tie components. Furthermore, there is no need to remove the positioning nuts and bearing gaskets in the later stages of construction. The work can be completed simply by filling and modifying the grooves of the longitudinal ribs, which greatly reduces the construction process and the amount of subsequent maintenance work, and significantly improves the convenience of construction.
[0065] The novel tie-connection structure and construction method for modular buildings described in this invention eliminates the quality risks such as bulging and grout leakage that are prone to occur with traditional wooden formwork. Through the rigid constraint of precast wall formwork and precise tie-fixing, the stable quality of cast-in-place concrete is ensured. At the same time, the synergistic effect of truss reinforcement, anchor steel plates and tie components enhances the robustness of the module connection and further improves the reliability of the building structure.
[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
[0067] Any aspects of this invention not described in detail are well-known to those skilled in the art.
Claims
1. A novel tie-connection structure suitable for modular buildings, wherein the tie-connection structure is detachably connected between an outer precast wall formwork and an inner precast wall formwork to achieve tie-fixation, the outer precast wall formwork and the inner precast wall formwork are arranged opposite to each other, and a cast-in-place space is formed between the outer precast wall formwork and the inner precast wall formwork, wherein truss reinforcement is pre-embedded in the outer precast wall formwork, characterized in that: The tie rod connection structure includes a tie rod, a pre-embedded truss bar nut welded to the truss bar, and an anchoring steel plate pre-embedded in the inner precast wall formwork. One end of the tie rod is threadedly connected to the pre-embedded truss bar nut, and the other end of the tie rod passes through the anchoring steel plate and is threadedly connected to the positioning nut.
2. The novel tie-connection structure suitable for modular buildings according to claim 1, characterized in that, The truss reinforcement includes a lower chord reinforcement embedded in the outer precast wall formwork and an upper chord reinforcement located outside the outer precast wall formwork. The lower chord reinforcement and the upper chord reinforcement are connected by web reinforcement.
3. The novel tie-connection structure suitable for modular buildings according to claim 2, characterized in that, The web reinforcement bars are inclined, and both ends of the web reinforcement bars are welded to the upper chord reinforcement bars and the lower chord reinforcement bars respectively. The pre-embedded truss reinforcement nuts are welded to the connection between the web reinforcement bars and the upper chord reinforcement bars.
4. The novel tie-connection structure suitable for modular buildings according to claim 3, characterized in that, A pressure-bearing washer is also provided between the positioning nut and the anchoring steel plate, and the tie rod passes through the anchoring steel plate, the pressure-bearing washer and the positioning nut in sequence.
5. The novel tie-connection structure suitable for modular buildings according to claim 4, characterized in that, The inner precast wall formwork is pre-embedded with additional longitudinal ribs that are welded to the anchoring steel plate, and also has a groove that cooperates with the anchoring steel plate. The anchoring steel plate is located at the bottom of the groove and on the side of the inner precast wall formwork closest to the outer precast wall formwork.
6. The novel tie-connection structure for modular buildings according to claim 5, characterized in that, The additional longitudinal ribs are spaced four times. Two additional longitudinal ribs are welded to each end of the anchoring steel plate. The middle part of the additional longitudinal ribs is welded to the anchoring steel plate. The two ends of the additional longitudinal ribs are connected to the extension section in the inner precast wall formwork through a bent section.
7. The novel tie-connection structure for modular buildings according to claim 6, characterized in that, The additional longitudinal ribs are an integral structure, and the grooves are filled with plaster.
8. The novel tie-connection structure for modular buildings according to claim 7, characterized in that, The tie-connection structure is arranged in a rectangular array between the outer precast wall formwork and the inner precast wall formwork.
9. A construction method for a novel tie-connection structure suitable for modular buildings according to any one of claims 1-8, comprising the following steps: S1. Factory prefabrication preparation: During the factory prefabrication stage, ensure that the position and size of the truss reinforcement welding nuts and the longitudinal rib anchoring steel plate holes are accurately matched. S2. Module hoisting and positioning: Hoist the prefabricated modular building units to the designated construction position, adjust the verticality and spacing of adjacent units, and align the tie rods of adjacent wall forms. S3. For the installation of the built-in tie rod assembly, first pass one end of the tie rod through the longitudinal rib and insert it into the pre-embedded truss nut of the wall formwork truss reinforcement of another module. Then install the bearing pad and positioning nut on the other end in sequence. The lateral tie-and-fix of the adjacent walls is achieved by tightening the nuts. S4. Cast-in-place concrete pouring: Concrete is poured into the cast-in-place area between adjacent modular walls, and the wall formwork is used as a side formwork to bear the pouring pressure. S5. Post-construction treatment: After the concrete reaches the design strength, without removing the positioning nuts and bearing washers, fill and modify the grooves of the longitudinal ribs to complete the construction.