A modular wall structure for modular buildings

Abstract

This invention relates to a modular wall structure for modular buildings, belonging to the field of building construction technology. From top to bottom, it includes an upper precast wall, a precast slab, and a lower precast wall. The lower precast wall is vertically arranged, with a first groove centered at the top. The upper precast wall has a second groove centered at the bottom. The precast slab has a first protrusion at the bottom matching the first groove, and a second protrusion at the top matching the second groove. By providing the first and second protrusions on the precast slab, the precast slab can directly connect with the upper and lower precast walls. This arrangement changes the transmission path of the building wall's force, allowing the force on the precast slab to be directly transmitted to the upper and lower precast walls without being transmitted to the precast components.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and specifically relates to a modular wall structure for modular buildings. Background Technology

[0002] Steel-concrete composite structures combine the advantages of both steel and concrete structures, possessing high load-bearing capacity, stiffness, good seismic ductility, and energy dissipation capacity, making them suitable for widespread application in construction. Traditional steel-concrete composite construction mainly involves three steps: first, hoisting and installing the steel frame to the designated location; second, tying reinforcing bars around the steel frame to form a composite reinforcement system; and finally, pouring concrete so that the steel, reinforcing bars, and concrete work together to form an integrated load-bearing structure. These three steps must be performed sequentially and cannot be done simultaneously, resulting in long construction periods and cumbersome construction procedures for traditional steel-concrete composite buildings.

[0003] Therefore, to address the aforementioned problems, modular steel-concrete composite buildings have emerged. These buildings are characterized by prefabricated walls and panels manufactured in advance at the factory, then transported to the designated construction site for assembly. The modular building is then assembled on-site. Because the prefabricated walls and panels required for modular construction can be manufactured simultaneously, the construction cycle can be significantly reduced.

[0004] In particular, with the continued boom in Southeast Asian construction trade, the region's accelerated urbanization and rapid growth in infrastructure and housing demand have made cross-border transportation and logistics, project schedules, and cost control core challenges for construction companies going global. To adapt to the requirements of multinational supply chains and efficient delivery, modular design of building structures has become the mainstream choice in the industry: manufacturers break down buildings into standardized functional units, prefabricate them in factories, integrate interior decoration and equipment, forming a modular system that can be independently transported and quickly assembled on-site. This model not only conforms to international transportation size standards and reduces long-distance transportation losses and logistics costs, but also shortens on-site construction time, stabilizes quality, and adapts to the rapid construction needs of various parts of Southeast Asia, becoming a key technological path for construction companies to connect with the Southeast Asian market and enhance their cross-border competitiveness.

[0005] Currently, the connection between precast walls and precast slabs is achieved by first installing precast components onto the precast wall, and then connecting the precast slabs to the components with bolts, thus hanging the precast slabs on the components and ultimately connecting the precast slabs to the precast wall. However, this connection method requires the precast components to not only connect the precast slabs and the precast wall, but also to transfer the weight of the precast slabs to the components first, and then to the precast wall, resulting in an increase in the volume of the components to improve their load-bearing capacity. However, this further reduces the remaining space in the dwelling. Therefore, in practice, due to the limited size of the precast components, current modular buildings are only suitable for single-story dwellings or temporary lightweight dwellings, and cannot be applied to multi-story residential apartments. Summary of the Invention

[0006] To address the existing connection between precast slabs and precast walls, which is limited by the size of the precast components, resulting in limited load-bearing capacity and making them unsuitable for multi-story residential apartments, thus limiting modular buildings to single-story residences or temporary lightweight housing, this invention provides a modular wall structure for modular buildings.

[0007] The objective of this invention can be achieved through the following technical solutions: A modular wall structure for a modular building includes, from top to bottom, an upper precast wall, a precast slab, and a lower precast wall. The lower precast wall is vertically arranged, with a first groove centered at the top, and a second groove centered at the bottom of the upper precast wall. The bottom of the precast slab has a first protrusion matching the first groove, and the top of the precast slab has a second protrusion matching the second groove. Both the upper and lower precast walls are hollow thick-plate shear walls.

[0008] As a preferred embodiment of the present invention, it further includes an upper anti-bending steel and a lower anti-bending steel, wherein a first space is formed between the first groove and the first protrusion, and the upper anti-bending steel is filled in the first space; a second space is formed between the second protrusion and the second groove, and the lower anti-bending steel is filled in the second space.

[0009] As a preferred embodiment of the present invention, the central axis of the upper precast wall and the central axis of the lower precast wall coincide with each other.

[0010] As a preferred embodiment of the present invention, the precast slab includes a first slab and a second slab. The first slab includes a first mating part and a first load-bearing part that are connected to each other. The second slab includes a second mating part and a second load-bearing part that are connected to each other. The first mating part and the second mating part are symmetrically arranged and cooperate to form the second protrusion and the second groove.

[0011] As a preferred embodiment of the present invention, it further includes a positioning component, which includes a first positioning plate and a second positioning plate. The bottom of the first positioning plate is vertically disposed on one side of the lower precast wall, and the first mating part has a first mating groove that mates with the top of the first positioning plate. The bottom of the second positioning plate is vertically disposed on the other side of the lower precast wall, and the second mating part has a second mating groove that mates with the top of the second positioning plate.

[0012] As a preferred embodiment of the present invention, the positioning assembly further includes a connecting screw and a connecting nut. The first mating part, the second mating part, the first positioning plate, and the second positioning plate together form a connecting slot perpendicular to the end face of the first positioning plate. The connecting screw is disposed in the connecting slot, and the nut end face of the connecting screw is in contact with the end face of the second positioning plate. The connecting nut is threaded onto the connecting screw, and the end face of the connecting nut is in contact with the end face of the first positioning plate.

[0013] As a preferred embodiment of the present invention, the positioning component further includes a first limiting block and a second limiting block. The first limiting block is disposed within the first mating portion and is located between the first positioning plate and the second positioning plate, with its bottom end fitting against the end face of the first positioning plate. The second limiting block is disposed within the second mating portion and is located between the first positioning plate and the second positioning plate, with its bottom end fitting against the end face of the second positioning plate.

[0014] In a preferred embodiment of the present invention, the width of the first groove is greater than the width of the first protrusion; the width of the second groove is greater than the width of the second protrusion.

[0015] As a preferred embodiment of the present invention, a plurality of positioning components are provided, and the plurality of positioning components are equally spaced along the width direction of the precast slab.

[0016] As a preferred embodiment of the present invention, the connecting screw is hollow inside and has a plurality of grouting slots. The plurality of grouting slots are equally spaced along the axial direction of the connecting screw. The upper precast wall, the precast slab, and the lower precast wall together form a gap space. Any grouting slot is interconnected with the gap space, and cement is poured into the connecting screw to fill the gap space.

[0017] The beneficial effects of this invention are as follows: By setting a first protrusion and a second protrusion on the precast slab, the precast slab can be directly connected to the upper and lower precast walls. This setting changes the transmission path of the building wall's force, allowing the force on the precast slab to be directly transmitted to the upper and lower precast walls without being transmitted to the precast components. Therefore, the precast components in this solution only need to connect the precast slab to the upper and lower precast walls without transmitting the force from the precast slab to the upper and lower precast walls. Thus, the precast components in this solution are conventional connectors and will not be elaborated upon here. Furthermore, since the prefabricated components in this solution do not need to bear additional forces, the number of stories in this modular building will no longer be limited by the size of the prefabricated components. This makes this modular building suitable for multi-story residential apartments. It also solves the problem that the traditional connection between prefabricated slabs and prefabricated walls requires the force of the prefabricated slab to be transferred to the prefabricated components first and then to the prefabricated walls. This connection method requires an increase in the volume of the prefabricated components to improve their load-bearing capacity. However, this further reduces the remaining space in the residence. Therefore, in practice, due to the limitation of the size of the prefabricated components, current modular buildings are only suitable for single-story residences or temporary lightweight housing, and cannot be applied to multi-story residential apartments. Attached Figure Description

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a prefabricated wall structure diagram of a modular wall structure for a modular building according to the present invention; Figure 2 This is a prefabricated panel structure diagram of a modular wall structure for a modular building according to the present invention; Figure 3 This is a diagram showing the internal structure of a prefabricated panel of a modular wall structure for a modular building according to the present invention. Figure 4 For the present invention Figure 3 Enlarged view of point A.

[0020] Explanation of main symbols In the diagram: 1. Upper precast wall; 101. Second groove; 2. Precast slab; 201. First protrusion; 202. Second protrusion; 3. Lower precast wall; 301. First groove; 4. Upper anti-bending steel; 5. Lower anti-bending steel; 6. First plate; 601. First mating part; 602. First load-bearing part; 7. Second plate; 701. Second mating part; 702. Second load-bearing part; 8. Positioning assembly; 801. First positioning plate; 802. Second positioning plate; 803. Connecting screw; 8031. Grouting groove hole; 804. Connecting nut; 805. First limiting block; 806. Second limiting block; 9. Gap space. Detailed Implementation

[0021] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0022] Please see Figures 1-4 This embodiment provides a modular wall structure for a modular building, comprising, from top to bottom, an upper precast wall 1, a precast slab 2, and a lower precast wall 3. The lower precast wall 3 is vertically arranged, with a first groove 301 centrally located at the top of the lower precast wall 3. A second groove 101 is centrally located at the bottom of the upper precast wall 1. The bottom of the precast slab 2 has a first protrusion 201 matching the first groove 301, and the top of the precast slab 2 has a second protrusion 202 matching the second groove 101. The structure is constructed by providing the first protrusion 201 and the second protrusion 202 on the precast slab 2. 202 allows the precast slab 2 to be directly connected to the upper precast wall 1 and the lower precast wall 3. This configuration changes the transmission path of the building wall's force, enabling the force on the precast slab 2 to be directly transmitted to the upper precast wall 1 and the lower precast wall 3, without needing to be transmitted to the precast component. Therefore, the precast component in this scheme only needs to connect the precast slab 2 to the upper precast wall 1 and the lower precast wall 3, without transmitting the force from the precast slab 2 to the upper precast wall 1 and the lower precast wall 3. Thus, the precast component in this scheme is a conventional connector, which will not be elaborated upon here. Furthermore, since the prefabricated components in this scheme do not need to bear additional forces, the number of stories in the modular building is no longer limited by the size of the prefabricated components. This makes the modular building suitable for multi-story residential apartments. It also solves the problem that the traditional connection between prefabricated slab 2 and prefabricated wall requires the force of the prefabricated slab 2 to be transferred to the prefabricated component first and then to the prefabricated wall. This connection method requires an increase in the volume of the prefabricated component to improve its load-bearing capacity. However, this further reduces the remaining space of the residence. Therefore, in practice, the current modular building is only suitable for single-story residences or temporary lightweight residences due to the limitation of the size of the prefabricated components, and cannot be applied to multi-story residential apartments.

[0023] Furthermore, the modular building structure design enables prefabrication in domestic factories. All prefabricated components are loaded into transport containers and transported to the designated construction site. The modular building is then assembled on-site by splicing the upper prefabricated wall 1, lower prefabricated wall 3, and prefabricated panels 2. This model not only conforms to international transport dimensional standards, reducing long-distance transport losses and logistics costs, but also shortens on-site construction time, stabilizes quality, and adapts to the rapid construction needs of various parts of Southeast Asia. It has become a key technological path for construction companies to connect with the Southeast Asian market and enhance their cross-border competitiveness.

[0024] It is worth noting that the combined use of the upper precast wall 1, lower precast wall 3, and precast slab 2 in this design forms a vertical component assembly, creating a complete and reliable composite small frame lateral force resisting system. The upper precast wall 1 and lower precast wall 3 are equipped with grooves that mate with the precast slab 2, enhancing the overall integrity of the modular wall structure and enabling it to withstand various internal forces including shear, bending, tension, and compression. Furthermore, it is worth noting that modified concrete is incorporated into the surfaces of the upper precast wall 1, lower precast wall 3, and precast slab 2, providing waterproofing and moisture resistance. Additionally, it should be added that in this design, the upper precast wall 1 and lower precast wall 3 are hollow thick-plate shear walls. While meeting the vertical load-bearing and horizontal lateral force resistance requirements of shear walls, the hollow structure effectively reduces the self-weight of the components, facilitating prefabrication, cross-border transportation, and on-site hoisting and assembly, thus meeting the needs of efficient construction in modular buildings. At the same time, the hollow cavity can improve the wall's thermal insulation, heat insulation, and sound insulation performance, adapt to hot and humid climates, and facilitate the pre-layout of water and electricity pipelines, reducing on-site work procedures and improving the overall assembly efficiency and user comfort of the building.

[0025] Furthermore, this design employs a beamless structural system, abandoning the traditional load-bearing model that relies on beams to transfer loads and distribute stress. Through the interlocking structure of the upper precast wall 1, lower precast wall 3, and precast slab 2, vertical loads and horizontal forces are directly and rigidly transferred and collaboratively supported by the precast slab 2. This integrated node structure achieves seamless load transfer and overall stiffness enhancement, fundamentally replacing the load-bearing and shear-resisting functions of traditional beams. This design not only eliminates the potential for stress concentration at beam connections but also, thanks to the high-strength material of the thick slab and the overall collaborative load-bearing effect, achieves direct and efficient force transfer. While achieving equivalent or even stronger structural load-bearing capacity and seismic resistance, it significantly frees up interior space and optimizes building performance and usability.

[0026] Furthermore, this scheme also includes an upper anti-bending steel 4 and a lower anti-bending steel 5. A first space is formed between the first groove 301 and the first protrusion 201, and the upper anti-bending steel 4 is filled in the first space. A second space is formed between the second protrusion 202 and the second groove 101, and the lower anti-bending steel 5 is filled in the second space. By filling the first space and the second space with the upper anti-bending steel 4 and the lower anti-bending steel 5 respectively, the bending bearing capacity of the connection nodes between the precast slab 2 and the lower precast wall 3 and between the precast slab 2 and the upper precast wall 1 can be enhanced, preventing the nodes from bending and failing under horizontal loads or vertical eccentric loads, and ensuring the effective transmission of forces and the structural integrity between the upper precast wall 1 and the precast slab 2 and between the lower precast wall 3 and the precast slab 2.

[0027] It should be noted that in this scheme, the upper precast wall 1, the lower precast wall 3, and the precast slab 2 are all load-bearing structures of modular buildings, similar to the load-bearing structure of load-bearing walls in monolithic cast-in-place buildings. Therefore, in order to ensure that the force of the upper precast wall 1 can be effectively transferred to the lower precast wall 3 through the precast slab 2, the shape of the upper precast wall 1 projected onto the ground in this scheme is the same as the shape of the lower precast wall 3 projected onto the ground, and the central axis of the upper precast wall 1 and the central axis of the lower precast wall 3 coincide with each other.

[0028] As mentioned in the above embodiments, the wall structure of this solution is a load-bearing structure of a modular building. In a modular building, several such modular wall structures are installed. Due to the different locations of each modular wall structure within the modular building, the required lengths of the precast panels 2 vary. Furthermore, the positions of the first protrusion 201 and the second protrusion 202 on the precast panel 2 are not centered but precisely positioned at specific locations on each precast panel 2. Also mentioned above, both the precast panels 2 and the precast walls are prefabricated by the manufacturer and then transported to a designated location for assembly. Therefore, to reduce the inconsistency in the required lengths of each precast panel 2, and to ensure the precise positioning of the first protrusion 201 and the second protrusion 202 on each precast panel 2... To address the challenges at specific locations on the precast slab 2, this design includes a first slab 6 and a second slab 7. The first slab 6 comprises a first mating part 601 and a first load-bearing part 602 connected to each other. The second slab 7 comprises a second mating part 701 and a second load-bearing part 702 connected to each other. The first mating part 601 and the second mating part 701 are symmetrically arranged and cooperate to form a second protrusion 202 and a second groove 101. It should be noted that the first mating part 601 and the second mating part 701 both form the first protrusion 201 and the second protrusion 202 through cooperation, enabling them to engage with the upper precast wall 1 and the lower precast wall 3. The lengths of the first load-bearing part 602 and the second load-bearing part 702 are designed and manufactured according to actual conditions, and will not be elaborated here. It should also be noted that the shape of the first protrusion 201 and the second protrusion 202 are identical, and the central axis of the first protrusion 201 and the central axis of the second protrusion 202 coincide.

[0029] Here, it needs to be defined that the space between the upper precast wall 1 and the lower precast wall 3 is the mating space, and the precast slab 2 is set within the mating space. As mentioned in the above embodiment, the precast slab 2 needs to be divided into a first slab 6 and a second slab 7. In order to accurately position the first slab 6 and the second slab 7 within the mating space, this solution also includes a positioning component 8. The positioning component 8 includes a first positioning plate 801 and a second positioning plate 802. The bottom of the first positioning plate 801 is vertically set on one side of the lower precast wall 3, and the first mating part 601 has a first mating groove that mates with the top of the first positioning plate 801. The bottom of the second positioning plate 802 is vertically set on the other side of the lower precast wall 3, and the second mating part 701 has a second mating groove that mates with the top of the second positioning plate 802. By engaging the first mating groove with the top of the first positioning plate 801, the position of the first slab 6 within the mating space can be restricted. Similarly, by engaging the second mating groove with the top of the second positioning plate 802, the position of the second slab 7 within the mating space can be restricted.

[0030] After the first plate 6 and the second plate 7 are positioned within the mating space, the connection between the first plate 6 and the second plate 7 begins. Based on this, the positioning assembly 8 of this solution also includes a connecting screw 803 and a connecting nut 804. The first mating part 601, the second mating part 701, the first positioning plate 801, and the second positioning plate 802 together form a connecting slot perpendicular to the end face of the first positioning plate 801. The connecting screw 803 is disposed within the connecting slot, and the nut end face of the connecting screw 803 is in contact with the end face of the second positioning plate 802. The connecting nut 804 is threaded onto the connecting screw 803, and the end face of the connecting nut 804 is fitted against the end face of the first positioning plate 801. With this arrangement, when the connecting nut 804 and the connecting screw 803 are engaged, the end face of the nut of the connecting screw 803 is fitted against the end face of the second positioning plate 802, and the connecting nut 804 is threaded onto the connecting screw 803, and the end face of the connecting nut 804 is fitted against the end face of the first positioning plate 801, thus achieving the connection between the first plate 6 and the second plate 7.

[0031] Furthermore, to prevent the first positioning plate 801 and the second positioning plate 802 from partially bending due to the force of the connecting screw 803 and the connecting nut 804 during the engagement, the positioning assembly 8 in this solution also includes a first limiting block 805 and a second limiting block 806. The first limiting block 805 is disposed within the first mating part 601, located between the first positioning plate 801 and the second positioning plate 802, with its bottom end abutting against the end face of the first positioning plate 801. The second limiting block 806 is disposed within the second mating part 701, located between the first positioning plate 801 and the second positioning plate 802, with its bottom end abutting against the end face of the second positioning plate 802. Taking the effect of the first limiting block 805 on the first positioning plate 801 as an example, the same applies to the effect of the second limiting block 806 on the second positioning plate 802. The first limiting block 805 and the second limiting block 806 are both L-shaped components. The bottom end of the first limiting block 805 abuts against the top end face of the first positioning plate 801, and the contact area between the first limiting block 805 and the first positioning plate 801 is smaller than the contact area between the first limiting block 805 and the first mating part 601. With this arrangement, firstly, the force on the first positioning plate 801 is transmitted to the first mating part 601 through the first limiting block 805. Moreover, since the contact area between the first limiting block 805 and the first mating part 601 is larger than the contact area between the first limiting block 805 and the first positioning block, bending of the first limiting block 805 during force transmission can be avoided. Furthermore, the mating relationship between the first limiting block 805 and the first positioning plate 801 increases the bending resistance of the first positioning plate 801, preventing bending of the first positioning plate 801 during the engagement of the connecting screw 803 and the connecting nut 804.

[0032] Furthermore, as described in the above embodiments, since the first plate 6 and the second plate 7 need to be positioned within the mating space, and the first protrusion 201 and the second protrusion 202 formed by the first mating part 601 and the second mating part 701 also need to mate with the first groove 301 and the second groove 101 respectively, in order to ensure that the first plate 6 and the second plate 7 are positioned within the mating space while the first protrusion 201 and the second protrusion 202 can also mate with the first groove 301 and the second groove 101 respectively, in this solution, the width of the first groove 301 is greater than the width of the first protrusion 201; and the width of the second groove 101 is greater than the width of the second protrusion 202.

[0033] In addition, it should be noted that the positioning components 8 in this solution are provided in several quantities. The positioning components 8 are arranged at equal intervals along the width direction of the precast plate 2. This arrangement can ensure the installation accuracy of the first plate 6 and the second plate 7 within the mating space.

[0034] Furthermore, as can be seen from the above embodiments, the first plate 6 and the second plate 7 need to be positioned within the mating space by the positioning component 8. Normally, after the first plate 6 and the second plate 7 are positioned within the mating space, the end face of the first mating part 601 will fit against the end face of the second mating part 701. However, due to the limitations of the current processing technology's processing precision, after the first plate 6 and the second plate 7 are positioned, there is a gap between the end face of the first mating part 601 and the end face of the second mating part 701, preventing them from fitting together. This situation not only affects the effect of the force of the upper precast wall 1 being transmitted to the lower precast wall 3 through the precast plate 2, but also, the excessive gap will affect the mating effect of the connecting screw 803 and the connecting nut 804. As the usage time increases, when the force of the upper precast wall 1 is transmitted to the lower precast wall 3, it will cause vibration to the connecting screw 803 and the connecting nut 804, thereby affecting the mating effect of the connecting screw 803 and the connecting nut 804. Based on this, in order to solve the above problems, the connecting screw 803 of this solution is hollow inside, and the connecting screw 803 has a number of grouting slots 8031. The number of grouting slots 8031 ​​are equally spaced along the axial direction of the connecting screw 803. The upper precast wall 1, the first plate 6, the second plate 7 and the lower precast wall 3 together form a gap space 9. Any grouting slot 8031 ​​is connected to the gap space 9. By grouting cement into the connecting screw 803, the cement in the connecting screw 803 will fill the gap space 9 through the grouting slots 8031. After standing for a period of time, it can be ensured that there is no gap between the first mating part 601 and the second mating end. This not only increases the contact area between the precast plate 2 and the upper and lower precast plates 2, but also, due to the presence of cement in the gap space 9, further reduces the probability of vibration of the connecting screw 803, ensuring that the device of this solution can be used for a long time.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A modular wall structure for a modular building, characterized in that: The structure consists of an upper precast wall, a precast slab, and a lower precast wall, arranged from top to bottom. The lower precast wall is vertically oriented, with a first groove centered at the top. The upper precast wall has a second groove centered at the bottom. The precast slab has a first protrusion at the bottom that matches the first groove, and a second protrusion at the top that matches the second groove. Both the upper and lower precast walls are hollow thick-plate shear walls.

2. The modular wall structure of a modular building according to claim 1, characterized in that: It also includes an upper anti-bending steel and a lower anti-bending steel. A first space is formed between the first groove and the first protrusion, and the upper anti-bending steel is filled in the first space. A second space is formed between the second protrusion and the second groove, and the lower anti-bending steel is filled in the second space.

3. The modular wall structure of a modular building according to claim 1, characterized in that: The central axis of the upper precast wall and the central axis of the lower precast wall coincide with each other.

4. The modular wall structure of a modular building according to claim 1, characterized in that: The precast slab includes a first slab and a second slab. The first slab includes a first mating part and a first load-bearing part that are connected to each other. The second slab includes a second mating part and a second load-bearing part that are connected to each other. The first mating part and the second mating part are symmetrically arranged and cooperate to form the second protrusion and the second groove.

5. The modular wall structure of a modular building according to claim 4, characterized in that: It also includes a positioning component, which includes a first positioning plate and a second positioning plate. The bottom of the first positioning plate is vertically disposed on one side inside the lower precast wall, and the first mating part has a first mating groove that mates with the top of the first positioning plate. The bottom of the second positioning plate is vertically disposed on the other side inside the lower precast wall, and the second mating part has a second mating groove that mates with the top of the second positioning plate.

6. The modular wall structure of a modular building according to claim 5, characterized in that: The positioning assembly further includes a connecting screw and a connecting nut. The first mating part, the second mating part, the first positioning plate, and the second positioning plate together form a connecting slot perpendicular to the end face of the first positioning plate. The connecting screw is disposed in the connecting slot, and the nut end face of the connecting screw is in contact with the end face of the second positioning plate. The connecting nut is threaded onto the connecting screw, and the end face of the connecting nut is in contact with the end face of the first positioning plate.

7. The modular wall structure of a modular building according to claim 5, characterized in that: The positioning component further includes a first limiting block and a second limiting block. The first limiting block is disposed within the first mating part and is located between the first positioning plate and the second positioning plate. The bottom end of the first limiting block is fitted with the end face of the first positioning plate. The second limiting block is disposed within the second mating part and is located between the first positioning plate and the second positioning plate. The bottom end of the second limiting block is fitted with the end face of the second positioning plate.

8. The modular wall structure of a modular building according to claim 1, characterized in that: The width of the first groove is greater than the width of the first protrusion; the width of the second groove is greater than the width of the second protrusion.

9. A modular wall structure for a modular building according to claim 5, characterized in that: The positioning components are provided in a plurality of them, and the plurality of positioning components are equally spaced along the width direction of the precast slab.

10. A modular wall structure for a modular building according to claim 6, characterized in that: The connecting screw is hollow inside and has several grouting slots. The grouting slots are evenly spaced along the axis of the connecting screw. The upper precast wall, the first plate, the second plate, and the lower precast wall together form a gap space. Any grouting slot is connected to the gap space. Cement is poured into the connecting screw to fill the gap space.

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