External prestressing tendon reinforcing truss structure capable of achieving multi-point local steering and method
By setting up a steering device and a fixed structure in the steel truss structure, the external prestressing beam can be locally steered at multiple points, solving the problem of restricted reinforcement effect of the external prestressing reinforcement method and increasing the structure's self-weight in the prior art, and realizing the Efficient steel truss reinforcement avoids damage to the original components.
Patent Information
- Application Number
- CN202411738570.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-01-10
AI Technical Summary
In the existing steel truss reinforcement methods, the reinforcement effect of the in vitro prestressing reinforcement method is limited by the prestress curve design, and the increase of the structural self-weight and may weaken the cross-sectional bearing capacity of the original components, which cannot achieve the reinforcement effect of multi-point local steering.
Design an external prestressed beam reinforcement structure that can be locally steering in multiple points. By setting up a steering device and a fixed structure, the external prestressed beam can be partially steering at different steering devices to avoid prestressed curve design, and is made of steel strands. The extracorporeal prestressed beam is anchored through the steering device to provide vertical force.
The optimal reinforcement effect of the external prestressed beam at each steering device is achieved, the structural self-weight is reduced, the original component cross-sectional bearing capacity is avoided, and the steel truss to be reinforced can be strengthened without stress Lag problem.
Smart Images
Figure CN119288245A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of truss reinforcement, in particular to an external prestressed beam reinforced truss structure capable of multi-point local steering and a method thereof. Background Art
[0002] Steel truss structures have the characteristics of high load-bearing capacity, fast construction speed and flexible design, and have been widely used in civil and industrial buildings. Over time, due to various reasons such as insufficient design, material aging, changes in usage conditions, etc., steel truss structures may need to be reinforced to meet new functional requirements or safety standards.
[0003] Among the existing steel truss reinforcement methods: the cross-section reinforcement method is to increase the cross-sectional size of the component to improve its bearing capacity and stiffness; the steel bonding reinforcement method is to use structural adhesive to stick the steel plate to the surface of the component to improve its bending and shear resistance; the new component reinforcement method is to connect additional plates or rods to the steel truss component by bolts to improve its bearing capacity; the external prestressed reinforcement method is to arrange prestressed steel strands outside the component and apply prestress, so that the force of the existing structural components is redistributed and adjusted, and the bearing capacity is improved.
[0004] The reinforcement method of increasing the cross section, the reinforcement method of bonding steel, and the reinforcement method of adding new components all have the problem of greatly increasing the deadweight of the structure. In order to achieve the best reinforcement effect, the external prestressed reinforcement method requires the design of the prestressed curve. For steel trusses, the steering device can only be set on the upper and lower chords, and the prestressed curve can only be selected as a straight line or a double broken line, which greatly reduces the reinforcement effect of the external prestressed force. Summary of the invention
[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an external prestressed beam reinforced truss structure and method capable of multi-point local steering. By setting a steering device, there is no need to design a prestressed curve. The external prestressed beam can be locally steered at different steering devices, thereby achieving the best reinforcement effect of the external prestressed beam at each steering device. In order to achieve the above purpose, the present invention is implemented through the following technical solutions:
[0006] In a first aspect, the present invention provides an external prestressed beam reinforced truss structure capable of multi-point local steering, comprising:
[0007] A plurality of steering devices are provided, which are perpendicular to the direction of the steel truss to be reinforced, fixedly arranged at the lower chord of the steel truss to be reinforced and expose the steering blocks arranged at both ends;
[0008] The fixing structure is symmetrically arranged above both sides of the steel truss to be reinforced and fixed;
[0009] The external prestressed tendons are made of steel strands, with both ends anchored on the fixed structure to provide vertical force for the steel trusses to be reinforced; they are symmetrically arranged on both sides of the steel trusses to be reinforced, with several tendons on each side, and each of the external prestressed tendons passes through the steering blocks of one or more of the steering devices and is turned at the set steering device.
[0010] As a further implementation method, a plurality of transverse partitions are provided on the steering block to divide it into different steering areas.
[0011] As a further implementation, the steering device includes a connecting beam and a connecting plate, the steering blocks are arranged at both ends of the connecting beam, and the connecting plate is used to connect to the lower chord of the steel truss to be reinforced.
[0012] As a further implementation method, the fixing structure is fixed to the load-bearing columns at both ends of the truss to be reinforced.
[0013] As a further implementation, the fixed structure includes an anchoring beam, a horizontal supporting beam, and a vertical supporting beam, which are arranged in a right triangle, wherein the anchoring beam serves as an anchoring structure of the extracorporeal prestressed beam.
[0014] As a further implementation, the axis of the horizontal support beam is parallel to the axis of the anchoring beam and is in the same horizontal plane, and the axis of the vertical support beam is parallel to the axis of the anchoring beam and is in the same vertical plane.
[0015] As a further implementation, the anchoring beam is provided with an extracorporeal prestressed beam anchoring region, which includes a sealing plate, and the sealing plate is provided with through holes with the same spacing as the transverse partition.
[0016] As a further implementation, the extracorporeal prestressed beam anchoring region further includes a plurality of support plates, which are used to connect the anchoring beam and the sealing plate and to form prestressed beam channels at intervals.
[0017] As a further implementation method, five steering devices are provided, and three of the external prestressed tendons are provided on both sides of the steel truss to be reinforced, one of which is turned at the steering device arranged in the middle, one of which is turned at two steering devices arranged at both sides of the middle, and one of which is turned at two steering devices arranged at the ends.
[0018] In a second aspect, the present invention provides a construction method for an external prestressed beam reinforced truss structure capable of multi-point local steering according to the first aspect, comprising the following steps:
[0019] Determine the key stress-bearing parts of the steel truss to be reinforced according to the load conditions of the steel truss to be reinforced, set a steering device at the key part, and install a fixed structure at the load-bearing columns at both ends of the truss;
[0020] The external prestressed tendons are arranged symmetrically so that each of them turns at each set position. The external prestressed tendons are threaded and installed according to the predetermined turning method. The tensioning sequence of the external prestressed tendons is to tension them one by one from the middle to both sides. When the tensioning force reaches the design value, the tensioning end is anchored.
[0021] The beneficial effects of the present invention are as follows:
[0022] 1. The steering device provided in the present invention does not need to be designed with a prestressed curve, and the external prestressed beam can be locally steered at different steering devices, thereby achieving the best reinforcement effect of the external prestressed beam at each steering device.
[0023] 2. The external prestressed bundle made of steel strands in the present invention is light in weight and will not significantly increase the deadweight of the steel truss structure to be reinforced. In addition, the steel strands have a long service life and do not have aging problems. At the same time, the method of reinforcing the steel truss with external prestressing can be used to reinforce the steel truss under the load state, without causing adverse effects on the original structure.
[0024] 3. The external prestressed beam of the present invention is connected to the steel truss to be reinforced through a steering device, and there is no need to open a hole in the steel truss structure to be reinforced, which will not weaken the cross-sectional bearing capacity of the original component.
[0025] 4. The present invention provides a fixed structure vertical to the direction of the truss to be reinforced, which is added above the truss to be reinforced to anchor the external prestressed tendons, and will not affect the use of the net space below the truss to be reinforced.
[0026] 5. After the steel truss is reinforced by the external prestressing method of the present invention, the external prestressed tendons can immediately cooperate with the steel truss to be reinforced to deform and bear stress, and there is no stress lag problem. When the prestress is relaxed, additional tensioning or replacement of the external prestressed tendons can be performed, and the reinforcement effect is good. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.
[0028] Figure 1 It is a schematic diagram of an external prestressed beam reinforced truss structure capable of multi-point local steering in an embodiment of the present invention.
[0029] Figure 2 It is a schematic diagram of the fixing structure in an embodiment of the present invention.
[0030] Figure 3 It is a schematic diagram of the sealing structure of the anchoring area in an embodiment of the present invention.
[0031] Figure 4It is a schematic diagram of the support plate structure in the anchoring area in an embodiment of the present invention.
[0032] Figure 5 Schematic diagram of the structure of the steering device in the embodiment of the present invention.
[0033] Figure 6 It is a structural schematic diagram of local deflection of the external prestress at the deflection block in an embodiment of the present invention.
[0034] Figure 7 It is a structural schematic diagram of an example of a steel truss structure to be reinforced in an embodiment of the present invention.
[0035] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.
[0036] Among them: 1. Load-bearing column of the truss to be reinforced; 21. Anchor beam; 22. Horizontal support beam; 23. Vertical support beam; 24. Support diagonal rod; 25. Support diagonal rod node plate; 26. Closing plate; 27. First stiffening plate; 28. Support plate; 29. Prestressed beam channel; 3. Steering device; 31. Connecting beam; 32. Connecting plate; 33. Steering block; 34. Transverse partition; 35. Second stiffening plate; 4. External prestressed Beam; 41. Prestressed beam partially turned to the outside of the body in the middle; 42. Prestressed beam partially turned to the outside of the body on both sides; 43. Prestressed beam partially turned to the outside of the body at the end; 44. Prestressed beam anchor; 51. Upper chord of steel truss to be reinforced; 52. Lower chord of steel truss to be reinforced; 53. Web member of steel truss to be reinforced; 6. Support truss to be reinforced; 61. Upper chord of support truss to be reinforced; 62. Lower chord of support truss to be reinforced; 63. Vertical rod of support truss to be reinforced. DETAILED DESCRIPTION
[0037] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.
[0038] Embodiment 1
[0039] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, an external prestressed beam reinforced truss structure capable of multi-point local steering includes a steering device 3, a fixed structure and an external prestressed beam 4 for providing vertical force to the steel truss to be reinforced.
[0040] like Figure 7As shown, the steel truss to be reinforced in this embodiment includes an upper chord 51 of the steel truss to be reinforced, lower chords 52 and 53 of the steel truss to be reinforced, and a web member of the steel truss to be reinforced; and also includes a support truss 6 to be reinforced, which is composed of an upper chord 61 of the support truss to be reinforced, a lower chord 62 of the support truss to be reinforced, and a vertical rod 63 of the support truss to be reinforced. The specific connection relationship between the various structures in the steel truss to be reinforced belongs to the prior art and will not be repeated here.
[0041] A plurality of steering devices 3 are provided, which are perpendicular to the direction of the steel truss to be reinforced and fixedly arranged at the lower chord 52 of the steel truss to be reinforced. In this embodiment, five steering devices 3 are provided. It can be understood that in some other embodiments, a corresponding number of steering devices 3 can be selected according to actual needs, and the arrangement is not limited to the arrangement in this embodiment.
[0042] The steering device 3 does not need to be designed with a prestress curve, and the extracorporeal prestressed bundle 4 can be locally steered at different steering devices 3 , thereby achieving the best reinforcement effect of the extracorporeal prestressed bundle 4 at each steering device 3 .
[0043] The external prestressed beam 4 can be connected to the steel truss to be reinforced through the steering device 3, without opening holes in the steel truss structure to be reinforced, and will not weaken the cross-sectional bearing capacity of the original component.
[0044] like Figure 5 As shown, the steering device 3 includes a connecting crossbeam 31, a connecting plate 32, a steering block 33, a diaphragm 34 and a second stiffening plate 35. The steering blocks 33 are arranged at both ends of the connecting crossbeam 31. After the steering device 3 is installed, the steering blocks 33 expose the lower chord of the steel truss to be reinforced. A plurality of connecting plates 32 are fixedly arranged on the connecting crossbeam 31 corresponding to the web positions of the steel truss to be reinforced. The connecting plates 32 are used to connect with the lower chord 52 of the steel truss to be reinforced. Steering blocks 33 and diaphragms 34 are fixedly arranged at both ends of the connecting crossbeam 31. The steering blocks 33 coincide with the central axis of the connecting crossbeam 31. The diaphragms 34 divide the steering blocks 33 into different steering areas, and the steering areas are used to pass through the external prestressed beam 4. The number of diaphragms 34 is set according to the required steering areas. The second stiffening plate 35 is used to reinforce the connecting crossbeam 31.
[0045] like Figure 2 , Figure 3 and Figure 4 As shown, the fixed structure is symmetrically arranged above the two ends of the steel truss to be reinforced, and is fixed to the main load-bearing structure of the steel truss to be reinforced. In this embodiment, the fixed structure is fixed to the load-bearing column 1 of the truss to be reinforced. It can be understood that it can also be fixed to other main load-bearing structures.
[0046] The fixed structure added above the truss to be reinforced and perpendicular to the direction of the truss to be reinforced anchors the external prestressed tendons 4 without affecting the use of the net space below the truss to be reinforced.
[0047] The fixed structure includes an anchoring beam 21, a horizontal supporting beam 22, a vertical supporting beam 23 and a supporting diagonal rod 24. The anchoring beam 21, the horizontal supporting beam 22 and the vertical supporting beam 23 are arranged in a right triangle, wherein the anchoring beam 21 serves as an anchoring structure of the external prestressed beam 4.
[0048] The axis of the horizontal support beam 22 is parallel to the axis of the anchor beam 21 and is in the same horizontal plane, the axis of the vertical support beam 23 is parallel to the axis of the anchor beam 21 and is in the same vertical plane, the anchor beam 21, the horizontal support beam 22 and the vertical support beam 23 are fixedly connected by setting a plurality of support diagonal bars 24, and support diagonal bar node plates 25 are set at the connection points and fixed together on the load-bearing column 1 of the truss to be reinforced. The first stiffening plate 27 is set at the key positions of the anchor beam 21, the horizontal support beam 22 and the vertical support beam 23 to enhance the bearing capacity.
[0049] In this embodiment, four load-bearing columns 1 of the truss to be reinforced are arranged at each end of the steel truss to be reinforced, and the load-bearing columns 1 of the truss to be reinforced are arranged in pairs at both ends of the anchoring beam 21, the horizontal supporting beam 22, and the vertical supporting beam 23, wherein the anchoring beam 21 and the vertical supporting beam 23 are jointly fixed on two load-bearing columns 1 of the truss to be reinforced, and the horizontal supporting beam 22 is fixed on the other two load-bearing columns 1 of the truss to be reinforced.
[0050] An external prestressed beam anchoring area is provided at a corresponding position of the anchoring cross beam 21, and the external prestressed beam anchoring area is composed of a support plate 28 and a sealing plate 26. A plurality of support plates 28 are used to connect the anchoring cross beam 21 and the sealing plate 26 and to form a prestressed beam channel 29 at intervals. The sealing plate 26 is provided with perforations at the same intervals as the diaphragm 34, and the diameter of the perforations is larger than the diameter of the external prestressed beam 4. The external prestressed beam 4 can pass through the corresponding prestressed beam channel 29 and the perforations on the sealing plate 26 in sequence, and the external prestressed beam 4 after passing through the perforations of the sealing plate 26 is anchored by the prestressed beam anchor 44.
[0051] The external prestressed beam 4 provides vertical force for the steel truss to be reinforced. Both ends of the external prestressed beam 4 are fixedly arranged on the external prestressed fixed structure. The external prestressed beam 4 is symmetrically arranged on both sides of the steel truss to be reinforced, and each has a plurality of beams. The external prestressed beam 4 passes through one or more steering devices 3 and is turned at the set steering device 3.
[0052] The external prestressed bundle 4 made of steel strands is light in weight and will not significantly increase the deadweight of the steel truss structure to be reinforced. At the same time, the method of reinforcing the steel truss with external prestressing can be used to reinforce the steel truss under the load state, without causing adverse effects on the original structure.
[0053] like Figure 6As shown, in this embodiment, three external prestressed beams 4 are provided, namely, a middle local turning external prestressed beam 41, a side local turning external prestressed beam 42, and an end local turning external prestressed beam 43. The middle local turning external prestressed beam 41 only passes through the steering device 3 set in the middle and turns here; the side local turning external prestressed beam 42 passes through the three steering devices 3 set in the middle and on both sides, and turns at the two steering devices 3 set at the middle and both sides; the end local turning external prestressed beam 43 passes through all the steering devices 3, and turns at the two steering devices 3 set at the end. It can be understood that in some other embodiments, the arrangement is not limited to the arrangement of this embodiment, and can be arranged according to actual needs.
[0054] The extracorporeal prestressed strand 4 is made of steel strands. In this embodiment, the steel strands used have a nominal diameter of 12.7 mm to 21.8 mm, a tensile strength of 1570 MPa to 1960 MPa, and a load-bearing range of 3 to 46 tons.
[0055] Embodiment 2
[0056] This embodiment provides a construction method for an external prestressed beam reinforced truss structure suitable for multi-point local steering according to the first embodiment, comprising the following steps:
[0057] S101: According to the load condition of the steel truss to be reinforced, a stress analysis is performed on the steel truss to determine a key portion of the steel truss to be reinforced where a greater stress is applied, and a steering device 3 is provided at the key portion;
[0058] S102: according to the set steering device position, the external prestressed tendons 4 are symmetrically arranged so that each external prestressed tendon 4 is turned only at the set steering device 3;
[0059] S103: According to the predetermined position and number of the steering devices 3 and the number of the external prestressed tendons 4, an external prestressed reinforcement design is performed on the steel truss to be reinforced, and the diameter and prestress of the external prestressed tendons 4 are determined;
[0060] S104: Calculate the sizes of the anchor beam 21, the horizontal support beam 22, the vertical support beam 23 and the supporting diagonal rod 24 required in the fixed structure according to the prestressing force;
[0061] S105: Cutting the external prestressed tendons 4 and processing and manufacturing the fixed structure and the steering device 3;
[0062] S106: First, the surfaces used for docking between the external prestressed bundle 4 fixed structure and the main load-bearing structure (load-bearing beam, column) and the surfaces used for docking between the steering device 3 and the frame beam are polished and cleaned, and then the external prestressed bundle 4 fixed structure is welded to the main load-bearing structure (load-bearing beam, column), and the steering device 3 is welded to the lower chord 52 of the steel truss to be reinforced through the connecting plate 32, and all welding parts are sprayed with anti-rust paint;
[0063] S107: The external prestressed tendons 4 are threaded and installed according to a predetermined steering method;
[0064] S108: The tensioning sequence of the external prestressed tendons 4 is to tension one by one from the middle to both sides in sequence, first tensioning the middle local external prestressed tendons 41, then tensioning the local external prestressed tendons 42 on both sides and the end local external prestressed tendons 43; the tensioning adopts the method of tensioning force control as the main method and elongation value verification, and the deviation between the measured elongation value and the calculated elongation value should not exceed ±6%. During construction, the prestressed tendons are tensioned in one section. When the tensioning force reaches the design value, the tensioning end is anchored and the tensioning ends;
[0065] S109: After the external prestressed tendons 4 are tensioned, the external prestressed tendons 4, the external prestressed fixed structure and the steering device 3 are protected.
[0066] 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 external prestressed beam reinforced truss structure capable of multi-point local steering, characterized in that: include: A plurality of steering devices are provided, which are perpendicular to the direction of the steel truss to be reinforced, fixedly arranged at the lower chord of the steel truss to be reinforced and expose the steering blocks arranged at both ends; The fixing structure is symmetrically arranged above both sides of the steel truss to be reinforced and fixed; The external prestressed tendons are made of steel strands, with both ends anchored on the fixed structure to provide vertical force for the steel trusses to be reinforced; they are symmetrically arranged on both sides of the steel trusses to be reinforced, with several tendons on each side, and each of the external prestressed tendons passes through the steering blocks of one or more of the steering devices and is turned at the set steering device.
2. The external prestressed beam reinforced truss structure capable of multi-point local steering according to claim 1, characterized in that: The steering block is provided with a plurality of transverse partitions to divide it into different steering areas.
3. The external prestressed beam reinforced truss structure capable of multi-point local steering according to claim 1, characterized in that: The steering device comprises a connecting crossbeam and a connecting plate. The steering blocks are arranged at two ends of the connecting crossbeam. The connecting plate is used to connect with the lower chord of the steel truss to be reinforced.
4. The multi-point locally steerable external prestressed beam reinforced truss structure according to claim 2, characterized in that: The fixing structure is fixed on the load-bearing columns at both ends of the truss to be reinforced.
5. The multi-point locally steerable external prestressed beam reinforced truss structure according to claim 4, characterized in that: The fixed structure comprises an anchoring beam, a horizontal supporting beam, and a vertical supporting beam, which are arranged in a right triangle, wherein the anchoring beam serves as an anchoring structure of the extracorporeal prestressed beam.
6. The multi-point locally steerable external prestressed beam reinforced truss structure according to claim 5, characterized in that: The axis of the horizontal support beam is parallel to the axis of the anchor beam and is in the same horizontal plane, and the axis of the vertical support beam is parallel to the axis of the anchor beam and is in the same vertical plane.
7. The external prestressed beam reinforced truss structure capable of multi-point local steering according to claim 5, characterized in that: The anchoring crossbeam is provided with an extracorporeal prestressed beam anchoring area, which includes a sealing plate, and the sealing plate is provided with through holes with the same spacing as the transverse partition.
8. The multi-point locally steerable external prestressed beam reinforced truss structure according to claim 7, characterized in that: The in vitro prestressed beam anchoring area also includes a plurality of support plates, which are used to connect the anchoring beam and the sealing plate and to form prestressed beam channels at intervals.
9. The multi-point locally steerable external prestressed beam reinforced truss structure according to claim 1, characterized in that: There are five steering devices, and three of the external prestressed tendons are arranged on both sides of the steel truss to be reinforced, one of which is turned at the steering device arranged in the middle, one of which is turned at two steering devices arranged at both sides of the middle, and one of which is turned at two steering devices arranged at the ends.
10. The construction method of the truss structure reinforced with external prestressed beams capable of multi-point local steering according to any one of claims 1 to 9, characterized in that: The following steps are involved: Determine the key stress-bearing parts of the steel truss to be reinforced according to the load conditions of the steel truss to be reinforced, set a steering device at the key part, and install a fixed structure at the load-bearing columns at both ends of the truss; The external prestressed tendons are arranged symmetrically so that each of them turns at each set position. The external prestressed tendons are threaded and installed according to the predetermined turning method. The tensioning sequence of the external prestressed tendons is to tension them one by one from the middle to both sides. When the tensioning force reaches the design value, the tensioning end is anchored.