Modular construction key node based on high-strength bolt box connection

Abstract

The application discloses a kind of modular building key nodes based on high-strength bolt box connection and construction method, belong to prefabricated building technical field, for solving the problem of low connection efficiency, limited operation space, poor positioning accuracy, weak waterproof of horizontal component and vertical component in modular building.The upper and lower component end of horizontal component is embedded with high-strength bolt box with protruding part, anchor steel is welded on the outer wall of bolt box, and positioning sleeve is embedded on the side;vertical component end is provided with installation cavity matched with bolt box, installation groove with built-in sealing strip is arranged at joint, and operation hole is arranged on the side to communicate with installation cavity.During hoisting, the protruding part of bolt box is embedded into installation cavity to guide into position, construction personnel inserts high-strength bolt into positioning sleeve from side operation hole to lock, and sealing strip is compressed to form waterproof seal, realizing rapid, accurate and reliable connection of component, suitable for factory prefabrication and assembly construction of modular building.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building technology, specifically to a key node technology for modular buildings based on high-strength bolt box connections, and particularly to a connection node technology in which a bolt box with a protruding portion is pre-embedded at the end of a horizontal component, and a bolt is inserted and locked through a side operating hole after being embedded in a reserved installation cavity in a vertical component. Background Technology

[0002] Modular construction is an industrialized building method in which building components are prefabricated in a factory and then transported to the construction site for assembly. Modular construction has significant advantages such as high production efficiency, short construction cycle, controllable quality, energy saving and environmental protection, and is an important technological direction for the country's vigorous development of prefabricated buildings.

[0003] In modular construction, the connection nodes between components are key technical aspects affecting structural integrity, construction efficiency, and durability. In particular, the connection nodes between horizontal components (such as floor slabs and beams) and vertical components (such as wall panels and columns) are particularly challenging due to space constraints and operational difficulties. Existing connection methods mainly include the following: 1. Welded connection: The reinforcing bars or embedded steel plates of adjacent components are welded on site. This method has problems such as a large amount of on-site welding work, the welding quality being greatly affected by the technical level of the construction personnel, the heat-affected zone of welding adversely affecting the performance of the components, and low construction efficiency. In addition, welding operations are difficult in narrow spaces.

[0004] 2. Post-cast strip connection: A reinforcement lap area is reserved at the component connection point, and concrete is poured on-site using formwork and cured to the design strength. This method has a long construction period, is limited by the concrete curing time, cannot achieve immediate load-bearing capacity, and involves a large amount of wet work on-site.

[0005] 3. Ordinary bolt connection: Bolts or embedded parts are pre-embedded in the components, and ordinary bolts are used for connection. This method has low connection accuracy, exposed bolts are prone to corrosion, and there is a lack of effective waterproof sealing at the joints, making leakage easy to occur. In addition, when horizontal components are connected to vertical components, bolts usually need to be screwed in from the end face of the component, which is often blocked by adjacent components, resulting in extremely limited operating space.

[0006] In summary, existing modular building component connection technologies mainly have the following problems: (1) The connection efficiency is low and the on-site construction time is long, especially the connection between horizontal and vertical components is difficult due to limited operating space. (2) The connection accuracy is difficult to guarantee, the component assembly and positioning deviation is large, which affects the overall structural quality; (3) Insufficient waterproofing performance at the joints makes it easy for leaks to occur at the joints, affecting the durability and functionality of the building; (4) High operating space requirements. Existing bolt connection methods require operation from the end face of the component, which is difficult to implement at nodes with limited space. (5) Insufficient connection reliability: There is a lack of effective mechanical interlocking structure between horizontal and vertical members, and the structural safety cannot be guaranteed by relying solely on bolt friction connection. Based on this, the present invention designs a modular building key node based on high-strength bolt box connection to solve the problem. Summary of the Invention

[0007] To address the problems of low connection efficiency, limited operating space, difficulty in controlling precision, weak waterproofing, and insufficient connection reliability in existing modular building technologies, this invention provides a key node technology for modular buildings based on high-strength bolt box connections. By pre-embedding bolt boxes with protruding parts at the ends of horizontal components and embedding them into the pre-reserved installation cavities of vertical components, bolts are inserted and locked through the side operating holes, achieving rapid, accurate, safe connection and waterproof sealing between horizontal and vertical components.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a modular building key node based on high-strength bolt box connection, comprising horizontal components and vertical components; the horizontal components include an upper component and a lower component; High-strength bolt boxes are pre-embedded at the ends of the upper and lower components. The high-strength bolt boxes have protruding portions that extend beyond the end face of the horizontal component, and anchoring steel bars are welded to the outer wall. The anchoring steel bars are located inside the upper and lower components. A set of positioning sleeves is fixedly embedded on the left and right sides of each high-strength bolt box. The vertical component includes a vertical member, the upper and lower ends of which are provided with mounting cavities adapted to the high-strength bolt box, and both ends of the vertical member are provided with mounting grooves, the inner wall of each mounting groove being fitted with a sealing strip; The vertical member has a set of operating holes on both its left and right sides, and the two sets of operating holes are respectively connected to two mounting cavities. The high-strength bolt box protruding portions at the ends of the upper and lower components extend into the interiors of the two mounting cavities, respectively; a high-strength bolt is inserted into the operating hole, and the high-strength bolt extends through the operating hole into the interior of the positioning sleeve, thereby locking and fixing the high-strength bolt box to the vertical component.

[0009] Furthermore, the high-strength bolt box is a cast steel box or a welded steel box, made of Q345 steel, with a box wall thickness of not less than 8mm, and each high-strength bolt box has at least two bolt holes, and the length of the protruding part is 50mm to 200mm.

[0010] Furthermore, the mounting cavity is a groove reserved at the end of the vertical component. The depth of the groove is greater than the length of the protruding part, and an installation gap is left between the inner wall of the groove and the protruding part to facilitate hoisting and embedding.

[0011] Furthermore, the operating hole is a circular or oblong hole, located on both sides of the vertical member, corresponding to the position of the bolt hole in the high-strength bolt box. The size of the operating hole meets the operating space requirements for construction personnel to tighten bolts with a wrench, and the diameter is not less than 60mm.

[0012] Furthermore, the anchoring steel bars are arranged in an L-shape or U-shape, with one end welded to the outer wall of the high-strength bolt box and the other end embedded in the concrete of the horizontal member, thereby achieving an overall connection between the high-strength bolt box and the horizontal member.

[0013] Furthermore, the inner wall of the positioning sleeve is provided with an internal thread that matches the external thread of the high-strength bolt. After the high-strength bolt passes through the operating hole, it is screwed into the positioning sleeve and tightened.

[0014] Furthermore, the sealing strip is an EPDM rubber sealing strip, which is set in the mounting groove. The depth of the mounting groove is 0.5 to 0.8 times the thickness of the sealing strip. After the high-strength bolt is tightened, the sealing strip is compressed to 60% to 75% of its original thickness.

[0015] Furthermore, the high-strength bolts are grade 8.8 or 10.9 high-strength bolts, each high-strength bolt box is equipped with no less than two high-strength bolts, and the high-strength bolts are equipped with washers, the washers including flat washers and spring washers.

[0016] This invention also provides a construction method for the above-mentioned key nodes of modular buildings based on high-strength bolt box connections, comprising the following steps: S1: Production Steps for Embedded Parts—When producing the upper component in the factory, the first high-strength bolt box is embedded in the end of the upper component, with the protruding part of the bolt box extending beyond the end face of the component. The bolt box is fixed inside the component by anchoring steel bars. Similarly, a second high-strength bolt box is embedded when producing the lower component. Simultaneously, when producing the vertical component, a first mounting cavity is reserved at the upper end, a second mounting cavity is reserved at the lower end, and an operating hole is reserved in the side wall, which penetrates the side wall and communicates with the mounting cavity. Before embedding the bolt box, removable temporary plugs are filled into the bolt holes and protruding parts to prevent grout from entering during concrete pouring. The temporary plugs are removed after the component is demolded. The embedding positioning accuracy is controlled within ±2mm.

[0017] S2: Component hoisting and positioning steps—Transport the vertical component to the site and hoist it into position and secure it. Then hoist the upper and lower components, ensuring that the protruding part of the first bolt box at the end of the upper component is inserted into the first mounting cavity at the upper end of the vertical component, and the protruding part of the second bolt box at the end of the lower component is inserted into the second mounting cavity at the lower end of the vertical component, aligning the component joints. During hoisting, the protruding part of the bolt box slides along the guide of the mounting cavity to achieve precise positioning.

[0018] S3: Waterproof material installation steps - Install EPDM rubber sealing strips in the sealing grooves at the joints between the upper and vertical components and between the lower and vertical components, ensuring that the sealing strips fit completely with the sealing grooves without gaps or voids, providing a foundation for subsequent compression sealing after bolt tightening.

[0019] S4: Side Locking Bolt Procedure – Construction personnel insert high-strength bolts through the operating holes on the side wall of the vertical component, ensuring the bolts pass through the positioning sleeves in the bolt box. Initial tightening is performed using a manual wrench to bring the component into contact and preliminarily compress the sealing strip. After initial tightening, an electric torque wrench is used to perform final tightening according to the specified final tightening torque value, compressing the sealing strip to the designed compression amount to form a waterproof seal, completing the connection between the upper and vertical components, and between the lower and vertical components. Final bolt tightening uses the torque method, with the final tightening torque value determined according to the specifications and grade of the high-strength bolts. After final tightening, a torque wrench is used for torque sampling inspection, with a sampling quantity of no less than 10% of the total number of node bolts. After sampling inspection, the operating holes are sealed using sealing material of the same color as the component, restoring the surface smoothness and aesthetics of the component.

[0020] Compared with the prior art, the beneficial effects of the present invention are: fast: the bolt box is pre-embedded in the factory, and on site, only the protruding part of the bolt box at the end of the horizontal component needs to be inserted into the installation cavity of the vertical component, and the bolt can be tightened by inserting the bolt through the side operation hole to complete the connection. There is no need for welding or pouring concrete, and the construction efficiency is more than 50% higher than that of traditional welding connection.

[0021] Precision: The bolt box is precisely positioned and pre-embedded in the factory mold, with the pre-embedded positioning accuracy controlled within ±2mm; the mounting cavity provides a guide for the protruding part of the bolt box, and the protruding part slides into the mounting cavity during hoisting to achieve precise positioning; the positioning sleeve guides the bolts to be screwed in precisely, resulting in high component splicing accuracy.

[0022] Safety: The bolt box is pre-embedded at the end of the horizontal component and has a protruding part. After being embedded in the installation cavity of the vertical component, it forms a mechanical interlocking structure and is locked with high-strength bolts, ensuring reliable connection load-bearing capacity. The bolt box is integrally connected to the horizontal component through anchor steel bars to ensure the stress performance of the node. Each bolt box is equipped with no less than two high-strength bolts, providing high connection redundancy.

[0023] Waterproof: EPDM rubber sealing strips have excellent weather resistance, aging resistance and elastic recovery performance. After the bolts are tightened, the sealing strip is compressed to form a reliable waterproof seal, effectively preventing leakage at the joint. The service life of the sealing strip can reach more than 20 years.

[0024] Side operation: By setting operation holes on the side of vertical components, bolts can be inserted and tightened from the side without operating from the end face of the component, effectively solving the problem of limited operating space at the connection node between horizontal and vertical components.

[0025] Standardization: High-strength bolt boxes can be mass-produced industrially as standardized connectors. Different component types can use bolt boxes of the same specifications, which improves the standardization and production efficiency of modular buildings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the disassembled structure of the horizontal component of the present invention; Figure 3 This is a schematic diagram of the disassembled structure of the vertical component of the present invention; Figure 4 This is a schematic diagram of the disassembled structure of the high-strength bolt of the present invention.

[0028] The attached diagram lists the components represented by each number as follows: 1. Horizontal component; 11. Upper component; 12. Lower component; 13. High-strength bolt box; 131. Anchoring steel bar; 132. Positioning sleeve; 2. Vertical component; 21. Vertical member; 22. Mounting groove; 23. Sealing strip; 24. Mounting cavity; 25. High-strength bolt; 26. Gasket; 27. Operating hole. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 4This invention provides a technical solution: a modular building key node based on high-strength bolt box connection, including a horizontal component 1 and a vertical component 2; the horizontal component 1 includes an upper component 11 and a lower component 12; high-strength bolt boxes 13 are pre-embedded at the ends of both the upper component 11 and the lower component 12, the high-strength bolt boxes 13 have protruding portions extending beyond the end face of the horizontal component, and anchoring steel bars 131 are welded to the outer wall, the anchoring steel bars 131 are embedded inside the upper component 11 and the lower component 12, and a set of positioning sleeves 132 are fixedly installed on the left and right sides of each high-strength bolt box 13; the vertical component 2 includes a vertical component 21, the vertical component... The upper and lower ends of the vertical member 21 are provided with mounting cavities 24 that are adapted to the high-strength bolt box 13. Both ends of the vertical member 21 are provided with mounting grooves 22, and a sealing strip 23 is installed in each mounting groove 22. Both sides of the vertical member 21 are provided with a set of operating holes 27, and the two sets of operating holes 27 are respectively connected to the two mounting cavities 24. The protruding parts of the high-strength bolt box 13 at the ends of the upper member 11 and the lower member 12 extend into the interior of the two mounting cavities 24 respectively. The high-strength bolt 25 passes through the operating hole 27 and extends into the interior of the positioning sleeve 132 to lock and fix the high-strength bolt box 13 to the vertical member 21.

[0031] Please see Figure 2 The high-strength bolt box 13 is a cast steel or welded steel box made of Q345 steel, with a wall thickness of not less than 8mm. Each high-strength bolt box 13 has at least two bolt holes, and the length of the protruding part is 50mm to 200mm. An installation gap, generally 2mm to 5mm, is left between the outer wall of the protruding part and the inner wall of the mounting groove 22 to facilitate hoisting and embedding. The anchoring steel bars 131 are HRB400 steel bars with a diameter of not less than 12mm, with no less than 4 bars on each side, evenly distributed around the bolt box. The mounting cavity 24 is reserved for the vertical component 2. The groove at the end of the 1 is deeper than the length of the protruding part. There is an installation gap between the inner wall of the groove and the protruding part to facilitate hoisting and embedding. The operating hole 27 is a circular or oblong hole, which is set on the side walls of both sides of the vertical member 21 and corresponds to the position of the bolt hole in the high-strength bolt box 13. The size of the operating hole 27 meets the operating space requirements of the construction personnel to tighten the bolt with a wrench. The diameter is not less than 60mm. After the high-strength bolt 25 is inserted through the operating hole 27, it is screwed into the positioning sleeve 132 and tightened, which meets the operating space requirements of the construction personnel to tighten the bolt with a wrench.

[0032] Please see Figure 4The anchoring steel bars 131 are arranged in an L-shape or U-shape, with one end welded to the outer wall of the high-strength bolt box 13 and the other end embedded in the concrete of the horizontal member 1, so as to realize the overall connection between the high-strength bolt box 13 and the horizontal member 1. The inner wall of the positioning sleeve 132 is provided with an internal thread that matches the external thread of the high-strength bolt 25. After the high-strength bolt 25 is inserted through the operating hole 27, it is screwed into the positioning sleeve 132 and tightened. The sealing strip 23 is a EPDM rubber sealing strip 23, which is set in the installation groove 22. The depth of the installation groove 22 is 0.5 to 0.8 times the thickness of the sealing strip 23. After the high-strength bolt 25 is locked, the sealing strip 23 is compressed to 60% to 75% of its original thickness, and the depth of the sealing groove is 0.5 to 0.8 times the thickness of the sealing strip 23. The EPDM rubber sealing strip 23 has a rectangular or circular cross section and a Shore hardness of 50 to 70 degrees. The high-strength bolts 25 are grade 8.8 or 10.9 high-strength bolts 25. Each high-strength bolt box 13 is equipped with no less than two high-strength bolts 25. The high-strength bolts 25 are equipped with washers 26, which include flat washers and spring washers.

[0033] S1: Production steps of embedded parts - When producing the upper component 11 in the factory, the high-strength bolt box 13 is embedded in the end of the upper component 11, so that the protruding part of the bolt box extends out of the end face of the component. The bolt box is fixed inside the component by anchoring steel bars 131. Similarly, when producing the lower component 12, the high-strength bolt box 13 is embedded. At the same time, when producing the vertical component 21, a first mounting cavity 24 is reserved at the upper end and a second mounting cavity 24 is reserved at the lower end. An operating hole 27 is reserved on the side wall. The operating hole 27 penetrates the side wall and communicates with the mounting cavity 24. Before the bolt box is embedded, a removable temporary plug is filled in the bolt hole and the protruding part to prevent grout from entering during concrete pouring. After the component is demolded, the temporary plug is removed. The positioning accuracy of the embedded parts is controlled within ±2mm.

[0034] S2: Component hoisting and positioning steps—Transport the vertical component 21 to the site and hoist it into position and fix it in place. Then hoist the upper component 11 and the lower component 12, so that the protruding part of the high-strength bolt box 13 at the end of the upper component 11 is embedded into the mounting cavity 24 at the upper end of the vertical component 21, and the protruding part of the high-strength bolt box 13 at the end of the lower component 12 is embedded into the mounting cavity 24 at the lower end of the vertical component 21, aligning the component joints. During hoisting, the protruding part of the bolt box slides in along the guide of the mounting cavity 24 to achieve precise positioning.

[0035] S3: Waterproof material installation steps - Install sealing strips 23 in the mounting grooves 22 at the joints between the upper component 11 and the vertical component 21 and the lower component 12 and the vertical component 21, ensuring that the sealing strips 23 fit completely with the mounting grooves 22 without gaps or voids, providing a foundation for subsequent compression sealing after bolt tightening.

[0036] S4: Side Locking Bolt Procedure – The construction worker inserts a high-strength bolt 25 through the operating hole 27 on the side wall of the vertical component 21, allowing the high-strength bolt 25 to pass through the positioning sleeve 132 inside the high-strength bolt box 13. Initial tightening is performed using a manual wrench to bring the components together and initially compress the sealing strip 23. After initial tightening, an electric torque wrench is used to perform final tightening according to the specified final tightening torque value, compressing the sealing strip 23 to the designed compression amount to form a waterproof seal, completing the connection between the upper component 11 and the vertical component 21, and between the lower component 12 and the vertical component 21. The final bolt tightening is performed using the torque method, with the final tightening torque value determined according to the specification grade of the high-strength bolt 25. After final tightening, a torque wrench is used to perform a torque sampling inspection, with the number of inspections not less than 10% of the total number of node bolts. After the sampling inspection, the operating hole 27 is sealed using a sealing material of the same color as the component, restoring the surface smoothness and aesthetics of the component.

[0037] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A modular building key node based on high-strength bolt box connection, comprising a horizontal member (1) and a vertical member (2); the horizontal member (1) comprises an upper member (11) and a lower member (12). High-strength bolt boxes (13) are pre-embedded at the ends of the upper component (11) and the lower component (12). The high-strength bolt boxes (13) have protruding portions that extend out of the end face of the horizontal component, and anchoring steel bars (131) are welded to the outer wall. The anchoring steel bars (131) are located inside the upper component (11) and the lower component (12). A set of positioning sleeves (132) are fixedly embedded on the left and right sides of each high-strength bolt box (13). The vertical member (2) includes a vertical member (21). The upper and lower ends of the vertical member (21) are provided with mounting cavities (24) that are compatible with the high-strength bolt box (13). Both ends of the vertical member (21) are provided with mounting grooves (22). Each mounting groove (22) has a sealing strip (23) installed on its inner wall. The vertical member (21) has a set of operating holes (27) on both its left and right sides, and the two sets of operating holes (27) are respectively connected to the two mounting cavities (24); The high-strength bolt box (13) protruding from the ends of the upper component (11) and the lower component (12) extends into the interior of the two mounting cavities (24); a high-strength bolt (25) is inserted into the operating hole (27), and the high-strength bolt (25) extends through the operating hole (27) into the interior of the positioning sleeve (132) to lock and fix the high-strength bolt box (13) to the vertical component (21).

2. A modular building key node based on high-strength bolt box connection according to claim 1, characterized in that: The high-strength bolt box (13) is a cast steel box or a welded steel box, made of Q345 steel, with a box wall thickness of not less than 8mm. Each high-strength bolt box (13) has at least two bolt holes, and the length of the protruding part is 50mm to 200mm.

3. A modular building key node based on high-strength bolt box connection according to claim 1, characterized in that: The mounting cavity (24) is a groove reserved at the end of the vertical member (21). The depth of the groove is greater than the length of the protruding part. There is an installation gap between the inner wall of the groove and the protruding part to facilitate hoisting and embedding.

4. A modular building key node based on high-strength bolt box connection according to claim 1, characterized in that: The operating hole (27) is a circular or oblong hole, which is set on the side walls of both sides of the vertical member (21) and corresponds to the position of the bolt hole in the high-strength bolt box (13). The size of the operating hole (27) meets the operating space requirements of the construction personnel to tighten the bolt with a wrench, and the diameter is not less than 60mm.

5. A modular building key node based on high-strength bolt box connection according to claim 1, characterized in that: The anchoring steel bars (131) are arranged in an L-shape or U-shape, with one end welded to the outer wall of the high-strength bolt box (13) and the other end embedded in the concrete of the horizontal member (1), so as to realize the overall connection between the high-strength bolt box (13) and the horizontal member (1).

6. A modular building key node based on high-strength bolt box connection according to claim 1, characterized in that: The inner wall of the positioning sleeve (132) is provided with an internal thread that matches the external thread of the high-strength bolt (25). The high-strength bolt (25) is inserted through the operating hole (27) and screwed into the positioning sleeve (132) for fastening.

7. A modular building key node based on high-strength bolt box connection according to claim 1, characterized in that: The sealing strip (23) is an EPDM rubber sealing strip (23), which is set in the mounting groove (22). The depth of the mounting groove (22) is 0.5 to 0.8 times the thickness of the sealing strip (23). After the high-strength bolt (25) is tightened, the sealing strip (23) is compressed to 60% to 75% of its original thickness.

8. A modular building key node based on high-strength bolt box connection according to claim 1, characterized in that: The high-strength bolts (25) are grade 8.8 or grade 10.9 high-strength bolts (25), and each high-strength bolt box (13) is equipped with no less than two high-strength bolts (25). The high-strength bolts (25) are equipped with washers (26), and the washers (26) include flat washers and spring washers.

9. A construction method for key nodes in modular buildings based on high-strength bolt box connections, characterized in that: Includes the following steps: S1: Production of embedded parts - When producing the upper component (11) in the factory, the high-strength bolt box (13) is embedded at its end, so that the protruding part protrudes from the end face of the component and is fixed by the anchoring steel bar (131); similarly, when producing the lower component (12), the high-strength bolt box (13) is embedded; when producing the vertical component (21), the installation cavity (24) and installation groove (22) are reserved at the upper and lower ends, and the operation hole (27) is reserved on the side wall. S2: Component hoisting and positioning steps - hoist the vertical component (21) into position and fix it, then hoist the upper component (11) and the lower component (12) so that the high-strength bolt box (13) at the end of the upper component (11) and the lower component (12) are respectively embedded into the mounting cavity (24) at the upper and lower ends of the vertical component (21) and the joints are aligned; S3: Waterproof material installation steps - Install the sealing strip (23) in the installation groove (22) at the joint, and ensure that the sealing strip (23) fits completely with the installation groove (22); S4: Side locking bolt steps - The construction personnel insert high-strength bolts (25) and washers (26) through the operation hole (27) on the side wall of the vertical component (21), so that the bolts pass through the positioning sleeve in the high-strength bolt box (13), and first perform initial tightening to make the components fit together and initially press the sealing strip (23). Then, perform final tightening according to the specified final tightening torque, so that the sealing strip (23) is compressed to the design compression amount to form a waterproof seal, and the node connection is completed.

10. A construction method for a key modular building node based on high-strength bolt box connection according to claim 9, characterized in that: In step S1, before the high-strength bolt box (13) is pre-embedded, a removable temporary plug is filled in the bolt hole and the protruding part to prevent grout from entering during concrete pouring. The temporary plug is removed after the component is demolded. In step S4, the bolt is finally tightened using the torque method. The final tightening torque value is determined according to the specification grade of the high-strength bolt (25). After the final tightening is completed, a torque wrench is used to conduct a torque sampling inspection. The number of samples is not less than 10% of the total number of node bolts. After the sampling inspection is completed, the operating hole (27) is sealed.

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