A prestress-based steel structure modular building connecting system and its rapid construction method

Abstract

The application discloses a prestress-based steel structure modular building connecting system and a rapid construction method thereof, and relates to the field of building construction. The connecting system comprises an independent foundation, the top of which is provided with a boss; a column-beam combined unit, which comprises a square steel pipe column unit and two cross beams connected to the adjacent two side faces of the end of the square steel pipe column unit; the bottom end of the square steel pipe column unit located at the lowermost position of the connecting system is connected to the boss through a first plug-in connecting joint; the square steel pipe column units in each column-beam combined unit are coaxially spliced through a second plug-in connecting joint along the axial direction of the square steel pipe column unit; a top frame is plugged into the square steel pipe column unit located at the uppermost position of the connecting system through a third plug-in connecting joint; and prestressed steel strands are used to firmly press-connect the independent foundation, the column-beam combined unit and the top frame. The prestress-based steel structure modular building connecting system has the advantages of easy installation, good seismic performance and adaptability to different building requirements.

Description

Technical Field

[0001] This invention relates to modular steel structure building technology, specifically a prestressed steel structure modular building connection system and its rapid construction method. Background Technology

[0002] Modular steel structure construction represents a significant trend in the development of industrialized construction. A key characteristic of this construction method is that the connection nodes between modules have a significant impact on the overall structural performance, making the design of these nodes crucial. Currently, various forms of modular steel structure connection nodes have emerged both domestically and internationally and have been applied in practical engineering projects. However, research on the stress performance of these nodes is relatively limited, restricting their application in high-rise buildings and seismic fortification areas.

[0003] Traditional construction methods often suffer from long construction periods, high resource consumption, and severe environmental pollution. This is especially true for high-rise buildings and seismically designed areas, where structural stability and construction efficiency become critical challenges. To address these issues, modular construction has emerged.

[0004] Modular construction breaks down a building structure into several standardized modular units, which are prefabricated in a factory and then transported to the construction site for assembly. This method greatly improves construction efficiency and reduces environmental pollution caused by on-site construction.

[0005] In modular steel structure buildings, connection nodes are crucial for ensuring the overall structural stability and seismic performance. Existing modular steel structure connection nodes mostly use welding or bolting, and these methods have certain technical problems to some extent: (1) Connection efficiency problem: Existing modular steel structure buildings mostly use welding or traditional bolt connection at the connection nodes. These methods require a lot of time and labor on the construction site, and are difficult to construct in complex environments, resulting in low overall building efficiency.

[0006] (2) Connection reliability issues: Traditional connection methods may loosen or fall off during long-term use. Especially under extreme conditions such as earthquakes, the reliability of connection nodes becomes a key factor affecting structural safety.

[0007] (3) Seismic performance issues: Existing modular steel structure buildings have limitations in seismic design. The energy dissipation capacity of the connection nodes under seismic action is insufficient, making it difficult to meet the requirements of high seismic fortification. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention proposes a prestressed steel structure modular building connection system. This prestressed steel structure modular building connection system can improve the construction efficiency, connection reliability, and seismic performance of modular steel structures. At the same time, it has the characteristics of easy installation, high-strength connection, good seismic performance, and adaptability to different building needs.

[0009] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: A prestressed steel structure modular building connection system, comprising: An independent foundation, located at the bottom of the connection system, has a boss on top; The column-beam combination unit includes a square steel tube column unit and two beams connected to two adjacent sides at its ends; The bottom end of the square steel tube column unit located at the bottom of the connection system is connected to the boss through the first insert-type connection node; The square steel tube column units in each column and beam combination unit are coaxially spliced ​​together along the axial direction of the square steel tube column unit through the second insert-type connection node. The top frame, located at the top of the connection system, is connected to the square steel tube column unit located at the top of the connection system via a third insert-type connection node; The prestressed steel strand is anchored at one end to the independent foundation, and at the other end, it passes sequentially through the top of the boss, the first insert-type connection node, the square steel pipe column unit in the column and beam combination unit, each of the second insert-type connection nodes, and the third insert-type connection node along the axial direction of the square steel pipe column unit before being anchored between the top frame and the top frame. Under the prestress of the prestressed steel strands, the independent foundation, column and beam combination unit and the top frame can be firmly pressed together; When subjected to earthquakes, the building connection system can absorb and dissipate energy through the deformation energy dissipation path composed of the prestressed steel strands and insert connection nodes.

[0010] The first plug-in connection node includes: The first main body pad is welded and fixed to the boss by pre-embedded parts, and has the same shape as the boss. The first main body pad is provided with holes for the prestressed steel strands to pass through. The first insertion component is connected to the first main body pad and has a protrusion that matches the shape of the inner cavity of the square steel tube column unit; The second plug-in connection node includes: A partition, and two second insertion components arranged symmetrically above and below by the partition, wherein, The partition plate has holes for the prestressed steel strands to pass through and has the same shape as the square steel tube column unit. The second insertion component has a protrusion that matches the shape of the inner cavity of the square steel tube column unit; The third plug-in connection node includes: The second main body pad is connected to the top frame, and the second main body pad has holes for the prestressed steel strands to pass through. The third insertion component has a protrusion that matches the shape of the inner cavity of the square steel tube column unit.

[0011] The first, second, and third insert-type connection nodes are all made of high-strength steel with a strength of not less than Q390.

[0012] The pre-drilled operating holes on the top of the foundation ensure sufficient operating space and facilitate the connection and anchoring of the bottom of the steel strand to the foundation.

[0013] Stress sensors are installed at the connection points between the prestressed steel strands and the independent foundation.

[0014] This invention further discloses a rapid construction method for prestressed modular steel structures, utilizing the aforementioned prestressed modular steel structure connection system, comprising the following steps: S1. Based on the building structure and design requirements, determine the quantity of independent foundations, column-beam combination units, first insert-type connection nodes, second insert-type connection nodes, third insert-type connection nodes, and prestressed steel strands. S2. Foundation preparation: Complete the foundation treatment at the construction site to ensure that the foundation is flat and stable, and set up independent foundation nodes to provide support for the superstructure; S3. Module Transportation and Assembly: The prefabricated independent foundations, column and beam combination units, first insert-type connection nodes, second insert-type connection nodes, third insert-type connection nodes, and prestressed steel strands are transported to the construction site and hoisted using lifting equipment; this includes the following sub-steps: S31. Weld and fix the first insert-type connection node to the boss on the top of the independent foundation, and insert the bottom end of the square steel pipe column unit located at the bottom of the connection system outside the first insert-type connection node. S32. The square steel tube column units in each column and beam combination unit are coaxially spliced ​​along the axial direction of the square steel tube column unit through the second insert-type connection node in sequence. S33. Lift the top frame to the top of the building and insert the third insert-type connection node at the bottom of the top frame into the top of the square steel tube column unit located at the top of the connection system. S4. Applying Prestress: The prestressed steel strands are passed through the hollow part of the square steel pipe column according to the design position. Since the middle of the insertion connection node is left with a hole that matches the hollow part of the steel pipe column, the steel pipe column is connected from top to bottom. The prestressed steel strands pass down from the top surface of the square steel pipe column until they reach the foundation. Anchors are installed on the upper part of the top frame and the independent foundation. The stress sensor is used to monitor the stress change of the steel strands in real time. The anchors are used to fix the ends of the steel strands and prepare for the application of prestress, firmly pressing down the middle module to prevent the connecting parts from loosening or falling off when subjected to external forces. After the prestressed steel strands are anchored, the anchors are sealed.

[0015] S5. Structural Verification: Verify the horizontal and verticality of the assembled structure to ensure it meets design requirements; conduct strength tests on node connections to ensure all connection points meet design standards; after construction is completed, conduct a comprehensive inspection and acceptance of the overall structure, including the integrity of node connections and the stability of the structure. Beneficial effects

[0016] The prestressed steel structure modular building connection system of the present invention has the following technical advantages compared with the existing steel structure modular building system: (1) Design of a novel insert-type connection node. The connection node adopts an insert-type connection method, specifically a double-sided connection component that can be inserted into the square steel tube column. Both the square steel tube column and the connection component are made of high-strength steel to ensure the stability and durability of the structural connection. The connection node is designed with dual functions of guiding and locking to ensure accurate alignment and secure locking during insertion.

[0017] (2) Rapid on-site assembly technology. During on-site construction, the connecting components are inserted into the upper and lower steel square tube columns through a guiding mechanism to achieve rapid connection. Prestressed steel strands are used to firmly lock the overall structure to the foundation to ensure that the nodes will not loosen or fall off when subjected to external forces. Adjustment space is reserved at the connection nodes to ensure efficiency and accuracy during on-site installation.

[0018] (3) Precise application technology for prestress. Prestressing technology is used at the connection points of modular units, and prestress is applied through prestressed steel strands. Stress sensors are installed at the connection points between the prestressed steel strands and the foundation, which also serve as energy dissipation devices. They can intelligently monitor the stress changes of the steel strands in real time, such as under seismic forces, providing real-time feedback for structural safety. During the prestressing process, specialized equipment is used for tensioning to ensure the accuracy and uniformity of the prestress value.

[0019] (4) Seismic Resistance Measures. The design of the connection nodes considers their synergistic effect with the overall structure, ensuring that all parts of the structure can work effectively together under seismic loads. Simultaneously, the connection node design incorporates seismic energy dissipation mechanisms, employing high-strength steel capable of undergoing plastic deformation without failure under seismic loads, thereby absorbing and dissipating seismic energy and enhancing the node's energy dissipation capacity during earthquakes. When subjected to seismic loads, the connection nodes can absorb and dissipate energy through deformation paths composed of prestressed steel strands, stress sensors, and node connectors, reducing the impact on the overall structure. The design of the connection nodes facilitates inspection and replacement, enabling rapid repair after an earthquake and minimizing building downtime.

[0020] (5) Enhanced environmental adaptability. The connection nodes are treated with anti-corrosion measures, such as plating, coating or other protective measures, to adapt to different environmental conditions. The design takes into account the thermal expansion and contraction of the nodes under extreme climates to ensure the stability and durability of the connection.

[0021] (6) Optimized construction efficiency. The new plug-in connection node reduces on-site welding and bolting operations, greatly improving construction efficiency. The standardized and modular design of the connection node reduces construction complexity and shortens the construction period.

[0022] Through the above-mentioned technical means, this invention patent can realize a rapid construction method for modular steel structures that is efficient, reliable, earthquake-resistant, environmentally adaptable, and easy to construct, thereby solving the problems existing in the prior art. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of the square steel tube column unit of the present invention; Figure 2 This is a schematic diagram of the structure of the second insertable connection node of the present invention; Figure 3 This is a schematic diagram of the cross-section of the beam of the present invention; Figure 4 This is a schematic diagram of the longitudinal beam cross-section; Figure 5 This is a schematic diagram of the structure of the first insertable connection node of the present invention; Figure 6 This is a schematic diagram of the structure of the independent basis of the present invention; Figure 7 This is a schematic diagram showing the connection between adjacent square steel pipe column units; Figure 8 This is a schematic diagram of the prestressed steel strand structure of the present invention; Figure 9 This is a schematic diagram of the top frame structure of the present invention; Figure 10 This is a top view of the modular steel structure building connection system of the present invention; Figure 11 This is a schematic diagram of the connection structure between the square steel pipe column and the independent foundation of the present invention; Figure 12 This is a schematic diagram of the overall structure of the modular steel structure building connection system of the present invention. Detailed Implementation

[0024] The technical solution of the present invention will be further described in detail below with reference to specific embodiments and the accompanying drawings.

[0025] The above is a schematic diagram of a rapid construction method for prestressed modular steel structures. Figure 1 -- Figure 6 This is a schematic diagram of modular steel structure beams, columns, connectors, and foundations.

[0026] Figure 7 This is a diagram illustrating the connections between modules; all connectors are hollow within the square steel tube columns.

[0027] Figure 8 The basic structure of prestressed steel strands is shown.

[0028] Figure 9 and Figure 10 The connection at the top of the column is shown. Prestressed steel strands are installed inside 10 square steel tube columns on the periphery of the structure. The bottom of the steel strands is anchored to the top of the foundation and a prestress sensor is installed. The top is anchored to the top of the column. The 10 steel strands tighten the module to the foundation to prevent the connectors from loosening or falling off when subjected to external forces.

[0029] Figure 11 The diagram shows the connection between the column base and the foundation top. The foundation top has pre-drilled holes to ensure sufficient operating space and facilitate the connection and anchoring of the bottom of the steel strand to the foundation.

[0030] Figure 12 This is a schematic diagram of the overall model. Example 1

[0031] A prestressed steel structure modular building connection system, comprising: An independent foundation, located at the bottom of the connection system, has a boss on top; The column-beam combination unit includes a square steel tube column unit and two beams connected to two adjacent sides at its ends; The bottom end of the square steel tube column unit located at the bottom of the connection system is connected to the boss through the first insert-type connection node; The square steel tube column units in each column and beam combination unit are coaxially spliced ​​together along the axial direction of the square steel tube column unit through the second insert-type connection node. The top frame, located at the top of the connection system, is connected to the square steel tube column unit located at the top of the connection system via a third insert-type connection node; The prestressed steel strand is anchored at one end to the independent foundation, and at the other end, it passes sequentially through the top of the boss, the first insert-type connection node, the square steel pipe column unit in the column and beam combination unit, each of the second insert-type connection nodes, and the third insert-type connection node along the axial direction of the square steel pipe column unit before being anchored between the top frame and the top frame. Under the prestress of the prestressed steel strands, the independent foundation, column and beam combination unit and the top frame can be firmly pressed together; when subjected to earthquake, the building connection system can absorb and dissipate energy through the deformation energy dissipation path composed of the prestressed steel strands and the inserted connection nodes.

[0032] As a further preferred embodiment of the present invention, the first plug-in connection node includes: The first main body pad is welded and fixed to the boss by pre-embedded parts, and has the same shape as the boss. The first main body pad is provided with holes for the prestressed steel strands to pass through. The first insertion component is connected to the first main body pad and has a protrusion that matches the shape of the inner cavity of the square steel tube column unit; The second plug-in connection node includes: A partition, and two second insertion components arranged symmetrically above and below by the partition, wherein, The partition plate has holes for the prestressed steel strands to pass through and has the same shape as the square steel tube column unit. The second insertion component has a protrusion that matches the shape of the inner cavity of the square steel tube column unit; The third plug-in connection node includes: The second main body pad is connected to the top frame, and the second main body pad has holes for the prestressed steel strands to pass through. The third insertion component has a protrusion that matches the shape of the inner cavity of the square steel tube column unit.

[0033] Preferably, the first, second, and third insert-type connection nodes are all made of high-strength steel with a strength of not less than Q390 to ensure the stability and durability of the structural connection.

[0034] In this embodiment of the invention, the insertable connection node is provided with a protrusion that matches the shape of the inner cavity of the square steel tube column unit. The protrusion has a dual function of guiding and locking, ensuring accurate alignment and secure locking during insertion.

[0035] Preferably, the boss at the top of the foundation has pre-drilled operating holes to ensure sufficient operating space and facilitate the connection and anchoring of the bottom of the steel strand to the foundation. Example 2

[0036] The difference between this embodiment and Embodiment 1 is that a stress sensor is installed at the connection between the prestressed steel strand and the independent foundation. This sensor also functions as an energy dissipation device, enabling real-time intelligent monitoring of stress changes in the steel strand, such as during earthquakes, providing real-time feedback for structural safety. During prestressing, specialized equipment is used for tensioning to ensure the accuracy and uniformity of the prestress value.

[0037] This invention further discloses a rapid construction method for prestressed modular steel structures, utilizing the aforementioned prestressed modular steel structure connection system, comprising the following steps: S1. Based on the building structure and design requirements, determine the quantity of independent foundations, column-beam combination units, first insert-type connection nodes, second insert-type connection nodes, third insert-type connection nodes, and prestressed steel strands. S2. Foundation preparation: Complete the foundation treatment at the construction site to ensure that the foundation is flat and stable, and set up independent foundation nodes to provide support for the superstructure; S3. Module Transportation and Assembly: The prefabricated independent foundations, column and beam combination units, first insert-type connection nodes, second insert-type connection nodes, third insert-type connection nodes, and prestressed steel strands are transported to the construction site and hoisted using lifting equipment; this includes the following sub-steps: S31. Weld and fix the first insert-type connection node to the boss on the top of the independent foundation, and insert the bottom end of the square steel pipe column unit located at the bottom of the connection system outside the first insert-type connection node. S32. The square steel tube column units in each column and beam combination unit are coaxially spliced ​​along the axial direction of the square steel tube column unit through the second insert-type connection node in sequence. S33. Lift the top frame to the top of the building and insert the third insert-type connection node at the bottom of the top frame into the top of the square steel tube column unit located at the top of the connection system. S4. Applying Prestress: The prestressed steel strands are passed through the hollow part of the square steel pipe column according to the design position. Since the middle of the insertion connection node is left with a hole that matches the hollow part of the steel pipe column, the steel pipe column is connected from top to bottom. The prestressed steel strands pass down from the top surface of the square steel pipe column until they reach the foundation. Anchors are installed on the upper part of the top frame and the independent foundation. The stress sensor is used to monitor the stress change of the steel strands in real time. The anchors are used to fix the ends of the steel strands and prepare for the application of prestress, firmly pressing down the middle module to prevent the connecting parts from loosening or falling off when subjected to external forces. After the prestressed steel strands are anchored, the anchors are sealed.

[0038] S5. Structural Verification: Verify the horizontal and verticality of the assembled structure to ensure it meets design requirements; conduct strength tests on node connections to ensure all connection points meet design standards; after construction is completed, conduct a comprehensive inspection and acceptance of the overall structure, including the integrity of node connections and the stability of the structure.

Claims

1. A prestressed steel structure modular building connection system, characterized in that, include: An independent foundation is located at the bottom of the building connection system, and a boss is provided on top of the independent foundation; The column-beam combination unit includes a square steel tube column unit and two beams connected to two adjacent sides at its ends; The bottom end of the square steel tube column unit located at the bottom of the connection system is connected to the boss through the first insert-type connection node; The square steel tube column units in each column and beam combination unit are coaxially spliced ​​together along the axial direction of the square steel tube column unit through the second insert-type connection node. The top frame, located at the top of the connection system, is connected to the square steel tube column unit located at the top of the connection system via a third insert-type connection node; The prestressed steel strand is anchored at one end to the independent foundation, and at the other end, it passes sequentially through the top of the boss, the first insert-type connection node, the square steel pipe column unit in the column and beam combination unit, each of the second insert-type connection nodes, and the third insert-type connection node along the axial direction of the square steel pipe column unit before being anchored between the top frame and the top frame. Under the prestress of the prestressed steel strands, the independent foundation, column and beam combination unit and the top frame can be firmly pressed together; When subjected to earthquakes, the building connection system can absorb and dissipate energy through the deformation energy dissipation path composed of the prestressed steel strands and insert connection nodes.

2. The prestressed steel structure modular building connection system according to claim 1, characterized in that, The first plug-in connection node includes: The first main body pad is welded and fixed to the boss by pre-embedded parts, and has the same shape as the boss. The first main body pad is provided with holes for the prestressed steel strands to pass through. The first insertion component is connected to the first main body pad and has a protrusion that matches the shape of the inner cavity of the square steel tube column unit; The second plug-in connection node includes: A partition, and two second insertion components arranged symmetrically above and below by the partition, wherein, The partition plate has holes for the prestressed steel strands to pass through and has the same shape as the square steel tube column unit. The second insertion component has a protrusion that matches the shape of the inner cavity of the square steel tube column unit; The third plug-in connection node includes: The second main body pad is connected to the top frame, and the second main body pad has holes for the prestressed steel strands to pass through. The third insertion component has a protrusion that matches the shape of the inner cavity of the square steel tube column unit.

3. The prestressed steel structure modular building connection system according to claim 2, characterized in that, The first, second, and third insert-type connection nodes are all made of high-strength steel with a strength of not less than Q390.

4. The prestressed steel structure modular building connection system according to claim 1, characterized in that, The pre-drilled operating holes on the top of the foundation ensure sufficient operating space and facilitate the connection and anchoring of the bottom of the steel strand to the foundation.

5. The prestressed steel structure modular building connection system according to claim 4, characterized in that, Stress sensors are installed at the connection points between the prestressed steel strands and the independent foundation.

6. A rapid construction method for prestressed modular steel structures, utilizing the prestressed modular steel structure connection system described in claim 5, characterized in that, Includes the following steps: S1. Based on the building structure and design requirements, determine the quantity of independent foundations, column-beam combination units, first insert-type connection nodes, second insert-type connection nodes, third insert-type connection nodes, and prestressed steel strands. S2. Foundation preparation: Complete the foundation treatment at the construction site to ensure that the foundation is flat and stable, and set up independent foundation nodes to provide support for the superstructure; S3. Module Transportation and Assembly: The prefabricated independent foundations, column and beam combination units, first insert-type connection nodes, second insert-type connection nodes, third insert-type connection nodes, and prestressed steel strands are transported to the construction site and hoisted using lifting equipment; this includes the following sub-steps: S31. Weld and fix the first insert-type connection node to the boss on the top of the independent foundation, and insert the bottom end of the square steel column unit located at the bottom of the connection system outside the first insert-type connection node. S32. The square steel tube column units in each column and beam combination unit are coaxially spliced ​​along the axial direction of the square steel tube column unit through the second insert-type connection node in sequence. S33. Lift the top frame to the top of the building and insert the third insert-type connection node at the bottom of the top frame into the top of the square steel tube column unit located at the top of the connection system. S4. Applying prestress: The prestressed steel strands are passed through the hollow part of the square steel pipe column according to the design position. Since the middle of the insert-type connection node is left with a hole that matches the hollow part of the steel pipe column, the steel pipe column is connected from top to bottom. The prestressed steel strands pass down from the top surface of the square steel pipe column until they reach the independent foundation. Anchors are installed on the upper part of the top frame and the independent foundation respectively. The stress sensor is used to monitor the stress change of the steel strands in real time. The anchors are used to fix the ends of the steel strands and apply prestress to firmly press the middle module to prevent the insert-type connection node from loosening or falling off when subjected to external force. After the prestressed steel strands are anchored, the anchors are sealed. S5. Structural Verification: Verify the horizontal and verticality of the assembled structure to ensure it meets design requirements; conduct strength tests on node connections to ensure all connection points meet design standards; after construction is completed, conduct a comprehensive inspection and acceptance of the overall structure, including the integrity of node connections and the stability of the structure.

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