Fabricated prestressed steel frame structure and using method thereof

Abstract

The invention provides a fabricated prestressed steel frame structure and a using method thereof, and belongs to the technical field of constructional engineering, the fabricated prestressed steel frame structure comprises a plurality of central columns, the bottom ends of the plurality of central columns are fixed on a foundation through bottom end nodes, a steel beam is connected between the tops of every two adjacent central columns, and the ends of the steel beams are fixedly connected with the central columns through beam column nodes; a center column prestress inhaul cable is connected between the bottom end node and the beam column node, the middle of the center column is connected with the center column prestress inhaul cable through a center column supporting rod node, a steel beam prestress inhaul cable is connected between every two adjacent beam column nodes, and a plurality of steel beam supporting rod nodes are arranged on the steel beam. The steel beam is connected with the steel beam prestress inhaul cable through a plurality of steel beam supporting rod nodes. The buckling load capacity of the center column is greatly improved, the bending rigidity and stability of the steel beams are effectively improved, and therefore higher frame layer height and larger frame span are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering, and in particular relates to an assembled prestressed steel frame structure and a use method thereof. Background Art

[0002] Prefabricated steel frame structure building refers to a prefabricated building whose main structure is composed of steel components and assembled on site from prefabricated parts and components. It is based on industrialized construction methods to achieve the integration of structural systems, external protection systems, equipment and pipeline systems, interior decoration systems, etc., as well as the integration of planning, design, production and construction. It is finally assembled efficiently and reliably on site, and realizes a building that integrates building enclosures, main structures, and mechanical and electrical decoration. It embodies the idea of ​​green buildings and is the direction of modern architectural development.

[0003] Traditional steel frame structures are limited by the stability and rigidity of the components, making it difficult to achieve higher heights and larger spans. For example, as the frame height increases, the steel frame columns are prone to instability, and the increase in span will increase the bending moment and deformation of the steel beam in the span, making it difficult to meet actual usage requirements. Summary of the invention

[0004] In view of the defects or shortcomings in the prior art, the present invention provides an assembled prestressed steel frame structure and a method of using the same, which greatly improves the buckling load capacity of the central column and effectively improves the bending stiffness and stability of the steel beam, thereby achieving a higher frame height and a larger frame span.

[0005] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, an embodiment of the present invention provides an assembled prestressed steel frame structure, comprising a plurality of central columns, wherein the bottom ends of the plurality of central columns are fixed to a foundation through bottom nodes, a steel beam is connected between the tops of two adjacent central columns, and the ends of the steel beam are fixedly connected to the central columns through beam-column nodes; A central column prestressed cable is connected between the bottom node and the beam-column node, the middle of the central column is connected to the central column prestressed cable through a central column strut node, a steel beam prestressed cable is connected between two adjacent beam-column nodes, a plurality of steel beam strut nodes are arranged on the steel beam, and the steel beam is connected to the steel beam prestressed cable through a plurality of steel beam strut nodes.

[0006] Furthermore, the bottom node includes a first center column sleeve and a base, the first center column sleeve is adapted to the bottom end of the center column, the first center column sleeve is vertically fixed above the base, and a plurality of stiffening ribs are arranged between the first center column sleeve and the base.

[0007] Furthermore, the beam-column node includes a second center column sleeve and a beam-column connecting plate. Two beam-column connecting plates are provided, which are respectively sleeved on the outside of the second center column sleeve. Stiffening ribs are connected between the beam-column connecting plate and the second center column sleeve. The end of the steel beam is arranged between the two beam-column connecting plates and is fixedly connected to the two beam-column connecting plates by bolts.

[0008] Furthermore, the beam-column node comprises an upper beam-column node and a lower beam-column node, and the upper beam-column node and the lower beam-column node are symmetrically arranged.

[0009] Furthermore, the upper beam-column node comprises an upper sleeve of a second center column, a bottom end of the upper sleeve of the second center column is fixedly connected to an upper connecting plate of the beam-column, and a stiffening rib is connected between the upper connecting plate of the beam-column and the upper sleeve of the second center column.

[0010] Furthermore, the lower beam-column node comprises a second center column lower sleeve, a beam-column lower connecting plate is arranged at the top end of the second center column lower sleeve, and a stiffening rib is provided in the connection between the beam-column lower connecting plate and the second center column lower sleeve.

[0011] Furthermore, the center column support rod node includes a third center column sleeve, the third center column sleeve is sleeved on the outer side of the middle part of the center column, the center column support rod sleeve is fixedly connected to the side wall of the third center column sleeve, the center column support rod is fixedly connected inside the center column support rod sleeve, the center column support rod is perpendicular to the center column, and a first track groove for placing the center column prestressed cable is provided on the side of the center column support rod away from the center column.

[0012] Furthermore, the steel beam is an I-beam, and the steel beam support rod node includes a flange sleeve, which is sleeved on the outer side of the lower flange of the I-beam, and a steel beam support rod sleeve is arranged on the lower surface of the flange sleeve, and a steel beam support rod is fixedly connected inside the steel beam support rod sleeve, and the steel beam support rod is arranged vertically to the steel beam, and a second track groove for placing a prestressed cable of the steel beam is arranged at one end of the steel beam support rod away from the steel beam.

[0013] Furthermore, the steel beam is a box-type steel beam, and the steel beam support rod node includes a steel beam sleeve, which is sleeved on the outside of the box-type steel beam, and a steel beam support rod sleeve is provided on the lower surface of the steel beam sleeve, and a steel beam support rod is fixedly connected inside the steel beam support rod sleeve, and the steel beam support rod is vertically arranged to the steel beam, and a second track groove for placing a prestressed cable of the steel beam is provided at one end of the steel beam support rod away from the steel beam.

[0014] In a second aspect, an embodiment of the present invention provides a method for using an assembled prestressed steel frame structure, using an assembled prestressed steel frame structure as described above, including the following steps: First, fix the central column support rod node on the central column, fix the bottom end of the central column with the bottom end node, fix multiple steel beam support rod nodes on the steel beam, and fix the two ends of the steel beam with the central column through the beam-column node to form a steel frame structure; Arrange the central column prestressed cable on the first track groove of the central column support rod, and connect the two ends of the central column prestressed cable to the bottom node and the beam-column node respectively; arrange the steel beam prestressed cable on the second track groove of the steel beam support rod, and connect the two ends of the steel beam prestressed cable to the beam-column nodes at both ends of the steel beam respectively; All the prestressed cables of the central column and the prestressed cables of the steel beam are tensioned synchronously so that all the cables reach the preset prestressed value.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a central column prestressed cable between the bottom node and the beam-column node, sets a central column support rod node in the middle of the central column to connect the central column prestressed cable, and applies prestress to the central column by tensioning the central column prestressed cable, which can restrain the buckling deformation of the central column, thereby effectively increasing the buckling load of the central column, and can also increase the height of the central column while ensuring the stability of the structure.

[0016] 2. The present invention sets prestressed cables for the steel beam between the beam-column nodes at both ends of the steel beam, sets steel beam support rod nodes at multiple positions of the steel beam to be connected to the prestressed cables for the steel beam, and applies prestress to the steel beam by tensioning the prestressed cables for the steel beam, thereby forming a self-balancing tensioned beam-string structure, effectively improving the bending stiffness and stability of the steel beam under lateral loads, thereby improving the overall span of the beam.

[0017] 3. The beam-column node in the present invention adopts an assembled connection method, which can realize factory prefabrication and modular production of beams, columns and nodes, and rapid assembly at the construction site; at the same time, the node can not only provide sufficient strength and rigidity for the beam-column node, but also provide a connection position for the prestressed cable, forming a complete assembled cable-supported prestressed frame structure system with other components; each side of the central column sleeve of the node is arranged with a stiffening rib connected to the beam-column connecting plate, which can ensure the local strength and stability of the component. In addition, the beam-column node of the present invention has two types: integrated and split. The integrated node has higher integrity, and the split node has more flexible applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a steel frame structure in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of a bottom node in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of a beam-column node in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the split structure of the beam-column node in the first embodiment of the present invention; Figure 5 This is a schematic diagram of a central column support rod node in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of a steel beam brace node in Embodiment 1 of the present invention; Figure 7 This is another structural schematic diagram of a steel beam brace node in the first embodiment of the present invention; Figure 8 This is another structural schematic diagram of the steel frame in the first embodiment of the present invention; Among them, 1. center column; 2. bottom node; 21. first center column sleeve; 22. base; 3. steel beam; 4. beam-column node; 41. second center column sleeve; 42. beam-column connecting plate; 43. upper beam-column node; 431. second center column upper sleeve; 432. beam-column upper connecting plate; 44. lower beam-column node; 441. second center column lower sleeve; 442. beam-column lower connecting plate; 5. center column support rod node; 51. third center column sleeve; 52. center column support rod sleeve; 53. center column support rod; 54. first track groove; 6. center column prestressed cable; 7. steel beam support rod node; 71. flange sleeve; 72. steel beam support rod sleeve; 73. steel beam support rod; 74. second track groove; 75. steel beam sleeve; 8. steel beam prestressed cable. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Embodiment 1 A typical implementation of the present invention is as follows Figure 1 and Figure 8 As shown, an assembled prestressed steel frame structure includes multiple center columns 1. The positions of the center columns 1 are determined according to the axis grid of the structural plan layout diagram in the construction drawing. In this embodiment, four center columns 1 are provided. The bottom ends of the four center columns 1 are fixed to the foundation through the bottom nodes 2, and the four center columns 1 are fixedly connected to the bottom nodes 2 by bolts.

[0021] like Figure 2 As shown, the bottom node 2 includes a first center column sleeve 21 and a base 22. The first center column sleeve 21 is a rectangular structure, which is compatible with the bottom end of the center column 1, can be sleeved on the outside of the bottom end of the center column 1, and is fixedly connected by bolts. The base 22 is a prism-shaped structure. The first center column sleeve 21 is vertically fixed above the base 22. A plurality of stiffening ribs are arranged between the first center column sleeve 21 and the base 22, thereby improving the overall strength of the bottom node 2.

[0022] The tops of the four center columns 1 are connected by steel beams 3 to form a frame structure. The steel beams 3 are fixedly connected to the tops of the center columns 1 through beam-column joints 4. Figure 3 As shown, the beam-column node 4 includes a second center column sleeve 41 and a beam-column connecting plate 42. Two beam-column connecting plates 42 are provided, which are respectively sleeved on the outside of the second center column sleeve 41. The spacing between the two beam-column connecting plates 42 is set according to the height of the steel beam 3. Stiffening ribs are connected between the beam-column connecting plate 42 and the second center column sleeve 41, so as to improve the overall structural strength of the beam-column node 4.

[0023] The second center column sleeve 41 is adapted to the top of the center column 1. The top of the center column 1 is inserted into the second center column sleeve 41 and fixed by bolts. The end of the steel beam 3 is arranged between the two beam-column connecting plates 42 and fixedly connected to the two beam-column connecting plates 42 by bolts.

[0024] In other embodiments, Figure 4 As shown, the beam-column node 4 is a split structure, including an upper beam-column node 43 and a lower beam-column node 44, the upper beam-column node 43 and the lower beam-column node 44 are symmetrically arranged, the upper beam-column node 43 includes a second center column upper sleeve 431, the bottom end of the second center column upper sleeve 431 is fixedly connected with a beam-column upper connecting plate 432, a stiffening rib is connected between the beam-column upper connecting plate 432 and the second center column upper sleeve 431, the lower beam-column node 44 includes a second center column lower sleeve 441, the second center column lower sleeve 441 A beam-column lower connecting plate 442 is provided at the top, and a stiffening rib is provided between the beam-column lower connecting plate 442 and the second center column lower sleeve 441. The second center column lower sleeve 441 is adapted to the top of the center column 1. The top of the center column 1 can be inserted into the second center column lower sleeve 441 and fixedly connected by bolts. The end of the steel beam 3 is provided between the beam-column upper connecting plate 432 and the beam-column lower connecting plate 442, and is fixedly connected to the beam-column upper connecting plate 432 and the beam-column lower connecting plate 442 respectively by bolts.

[0025] By configuring the beam-column node 4 as a split structure, the distance between the upper beam-column node 43 and the lower beam-column node 44 can be flexibly adjusted according to the height of the steel beam 3, thereby satisfying the installation of beams of different heights.

[0026] The beam-column node in the present invention adopts an assembled connection method, which can realize factory prefabrication and modular production of beams, columns and nodes, and rapid assembly at the construction site; at the same time, the node can not only provide sufficient strength and rigidity for the beam-column node, but also provide a connection position for the prestressed cables, forming a complete assembled cable-supported prestressed frame structure system with other components.

[0027] A central column support rod node 5 is fixed in the middle of the central column 1. Figure 5As shown, the center column support rod node 5 includes a third center column sleeve 51, and the third center column sleeve 51 is arranged on the outer side of the middle part of the center column 1 and is fixedly connected to the center column 1 by bolts. A center column support rod sleeve 52 is fixedly connected to the side wall of the third center column sleeve 51, and a center column support rod 53 is fixedly connected inside the center column support rod sleeve 52. The center column support rod 53 is perpendicular to the center column 1, and a first track groove 54 is arranged on the side of the center column support rod 53 away from the center column 1 for fixing the center column prestressed cable 6.

[0028] A central column prestressed cable 6 is connected between the bottom node 2 and the beam-column node 4. One end of the central column prestressed cable 6 is connected to the stiffening rib on the bottom node 2, and the other end is connected to the stiffening rib on the beam-column node 4. The middle part of the central column prestressed cable 6 is placed in the first track groove 54 of the central column support rod node 5, and prestress is applied to the central column 1 by tensioning.

[0029] By setting a central column prestressed cable 6 between the bottom node 2 and the beam-column node 4, and setting a central column support rod node 5 in the middle of the central column 1 to connect the central column prestressed cable 6, and applying prestress to the central column 1 by tensioning the central column prestressed cable 6, it is possible to effectively provide lateral support for the central column 1, prevent the central column 1 from instability, and greatly improve the buckling load capacity of the central column 1.

[0030] A plurality of steel beam brace nodes 7 are arranged on the steel beam 3. In the present embodiment, three steel beam brace nodes 7 are arranged, which are respectively fixed at 1 / 4, 1 / 2 and 3 / 4 of the length of the steel beam 3. Steel beam prestressed cables 8 are connected between the beam-column nodes 4 at both ends of the steel beam 3. Both ends of the steel beam prestressed cables 8 are respectively connected to the stiffening ribs on the beam-column nodes 4, and the steel beam prestressed cables 8 are supported by the steel beam brace nodes 7.

[0031] The structure of the steel beam brace node 7 changes according to the shape of the steel beam 3. When the steel beam 3 is an I-beam, Figure 6 As shown, the steel beam support rod node 7 includes a flange sleeve 71, which is sleeved on the outer side of the lower flange of the I-beam, and a steel beam support rod sleeve 72 is arranged on the lower surface of the flange sleeve 71. A steel beam support rod 73 is fixedly connected inside the steel beam support rod sleeve 72. The steel beam support rod 73 is arranged vertically to the steel beam 3, and a second track groove 74 for placing the steel beam prestressed cable 8 is arranged at one end of the steel beam support rod 73 away from the steel beam 3.

[0032] When the steel beam 3 is a box-type steel beam, Figure 7As shown, the steel beam strut node 7 includes a steel beam sleeve 75, which is sleeved on the outside of the box-type steel beam and fixedly connected to the box-type steel beam by bolts. A steel beam strut sleeve 72 is provided on the lower surface of the steel beam sleeve 75, and a steel beam strut 73 is fixedly connected inside the steel beam strut sleeve 72. The steel beam strut 73 is vertically arranged to the steel beam 3, and a second track groove 74 for placing the steel beam prestressed cable 8 is provided at one end of the steel beam strut 73 away from the steel beam 3.

[0033] By arranging steel beam prestressed cables 8 between the beam-column nodes 4 at both ends of the steel beam 3, and arranging steel beam support rod nodes 7 connected to the steel beam prestressed cables 8 at multiple positions of the steel beam 3, and applying prestress to the steel beam 3 by tensioning the steel beam prestressed cables 8, the bending stiffness and stability of the steel beam 3 can be effectively improved, thereby achieving a higher frame floor height and a larger frame span.

[0034] In the present invention, assembled connections are adopted between beams and columns, and between struts and beams and columns, which has the characteristics of industrialized production and rapid on-site assembly, can simplify the design process, significantly improve production and installation efficiency, thereby realizing green construction, and has high practical application value.

[0035] Embodiment 2 This embodiment provides a method for using an assembled prestressed steel frame structure, using an assembled prestressed steel frame structure as described in the first embodiment, including the following steps: First, fix the central column support rod node on the central column, fix the bottom end of the central column with the bottom end node, fix multiple steel beam support rod nodes on the steel beam, and fix the two ends of the steel beam with the central column through the beam-column node to form a steel frame structure; Arrange the central column prestressed cable on the first track groove of the central column support rod, and connect the two ends of the central column prestressed cable to the bottom node and the beam-column node respectively; arrange the steel beam prestressed cable on the second track groove of the steel beam support rod, and connect the two ends of the steel beam prestressed cable to the beam-column nodes at both ends of the steel beam respectively; All the prestressed cables of the central column and the prestressed cables of the steel beam are tensioned synchronously so that all the cables reach the preset prestressed value.

[0036] By synchronously tensioning the prestressed cables of the central column and the prestressed cables of the steel beam, lateral support can be effectively provided for the central column to prevent the instability of the central column, greatly improving the buckling load capacity of the central column, and effectively improving the bending stiffness and stability of the steel beam, thereby achieving a higher frame floor height and a larger frame span.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An assembled prestressed steel frame structure, characterized in that: It includes a plurality of central columns, the bottom ends of which are fixed to the foundation through bottom nodes, a steel beam is connected between the tops of two adjacent central columns, and the end of the steel beam is fixedly connected to the central column through a beam-column node; A central column prestressed cable is connected between the bottom node and the beam-column node, the middle of the central column is connected to the central column prestressed cable through a central column support rod node, a steel beam prestressed cable is connected between two adjacent beam-column nodes, a plurality of steel beam support rod nodes are arranged on the steel beam, and the steel beam is connected to the steel beam prestressed cable through a plurality of steel beam support rod nodes.

2. The prestressed steel frame structure according to claim 1, characterized in that: The bottom node includes a first center column sleeve and a base. The first center column sleeve is adapted to the bottom end of the center column. The first center column sleeve is vertically fixed above the base. A plurality of stiffening ribs are arranged between the first center column sleeve and the base.

3. The prestressed steel frame structure according to claim 1, characterized in that: The beam-column node includes a second center column sleeve and a beam-column connecting plate. There are two beam-column connecting plates, which are respectively sleeved on the outside of the second center column sleeve. Stiffening ribs are connected between the beam-column connecting plate and the second center column sleeve. The end of the steel beam is arranged between the two beam-column connecting plates and is fixedly connected to the two beam-column connecting plates by bolts.

4. The assembled prestressed steel frame structure according to claim 1, characterized in that: The beam-column node comprises an upper beam-column node and a lower beam-column node, and the upper beam-column node and the lower beam-column node are symmetrically arranged.

5. The assembled prestressed steel frame structure according to claim 4, characterized in that: The upper beam-column node comprises an upper sleeve of a second central column, the bottom end of the upper sleeve of the second central column is fixedly connected to an upper beam-column connecting plate, and a stiffening rib is connected between the upper beam-column connecting plate and the upper sleeve of the second central column.

6. The assembled prestressed steel frame structure according to claim 4, characterized in that: The lower beam-column node comprises a second center column lower sleeve, a beam-column lower connecting plate is arranged at the top end of the second center column lower sleeve, and a stiffening rib is arranged between the beam-column lower connecting plate and the second center column lower sleeve.

7. The assembled prestressed steel frame structure according to claim 1, characterized in that: The center column support rod node includes a third center column sleeve, and the third center column sleeve is sleeved on the outer side of the middle part of the center column. The center column support rod sleeve is fixedly connected to the side wall of the third center column sleeve, and the center column support rod is fixedly connected inside the center column support rod sleeve. The center column support rod is perpendicular to the center column, and a first track groove for placing the center column prestressed cable is provided on the side of the center column support rod away from the center column.

8. The assembled prestressed steel frame structure according to claim 1, characterized in that: The steel beam is an I-beam, and the steel beam support rod node includes a flange sleeve, which is sleeved on the outer side of the lower flange of the I-beam, and a steel beam support rod sleeve is arranged on the lower surface of the flange sleeve, and a steel beam support rod is fixedly connected inside the steel beam support rod sleeve, and the steel beam support rod is arranged vertically to the steel beam, and a second track groove for placing a prestressed cable of the steel beam is arranged at one end of the steel beam support rod away from the steel beam.

9. The assembled prestressed steel frame structure according to claim 1, characterized in that: The steel beam is a box-type steel beam, and the steel beam support rod node includes a steel beam sleeve, which is sleeved on the outside of the box-type steel beam. A steel beam support rod sleeve is provided on the lower surface of the steel beam sleeve, and a steel beam support rod is fixedly connected inside the steel beam support rod sleeve. The steel beam support rod is vertically arranged to the steel beam, and a second track groove for placing a prestressed cable of the steel beam is provided at one end of the steel beam support rod away from the steel beam.

10. A method for using an assembled prestressed steel frame structure, using an assembled prestressed steel frame structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: First, fix the central column support rod node on the central column, fix the bottom end of the central column with the bottom end node, fix multiple steel beam support rod nodes on the steel beam, and fix the two ends of the steel beam with the central column through the beam-column node to form a steel frame structure; Arrange the central column prestressed cable on the first track groove of the central column support rod, and connect the two ends of the central column prestressed cable to the bottom node and the beam-column node respectively; arrange the steel beam prestressed cable on the second track groove of the steel beam support rod, and connect the two ends of the steel beam prestressed cable to the beam-column nodes at both ends of the steel beam respectively; All the prestressed cables of the central column and the prestressed cables of the steel beam are tensioned synchronously so that all the cables reach the preset prestressed value.

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