External prestressing reinforcing device for large-span steel structure

Abstract

The utility model provides an external prestressing reinforcing device for a large-span steel structure, which belongs to the technical field of external prestressing reinforcing, and comprises two groups of steering components arranged in parallel, and the steering components are arranged at the bottom of a steel beam; the anchoring assemblies are arranged at the tops of the two ends of the steel beam correspondingly; a prestressed steel beam is connected between the two anchoring assemblies, and the middle of the prestressed steel beam sequentially penetrates through the two steering assemblies. Prestress is applied to the steel beam through the steering assembly and the anchoring assembly, the steering assembly and the anchoring assembly are simple in structure, and construction of workers is facilitated; the steering assembly is fixed to the steel beam lower wing plate and the steel beam web plate, the possibility that the steering assembly deviates when prestress is applied is reduced, and potential safety hazards are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of external prestress strengthening, and particularly relates to an external prestress strengthening device for long-span steel structures. Background Art

[0002] A long-span steel structure refers to a structural system that uses steel as the main building material and is formed by welding, bolt connection, etc., and has a large space spanning ability.

[0003] During the Industrial Revolution in the 19th century, with the continuous progress of steel production technology and the increasing building demand, long-span steel structures gradually became an important building form. In the mid-late 20th century, the design and construction levels of long-span steel structures were significantly improved, and various new structural forms and construction technologies emerged continuously. The application of prestress technology, etc., further promoted the development of long-span steel structures.

[0004] The external prestress technology for steel structures is a technology that applies prestress outside the steel structure system to enhance the overall performance of the structure. By setting prestressing tendons (high-strength steel strands, wire bundles, etc.) at key positions of the steel structure, and fixing them with an anchoring system, and then tensioning the prestressing tendons through a tensioning device, a certain pre-compressive stress state is generated in the structure before it bears external loads. This pre-compressive stress can effectively offset part of the tensile stress caused by external loads, thereby improving the bearing capacity, stiffness and stability of the steel structure, while improving the deformation performance of the structure and extending the service life of the structure.

[0005] For the existing external prestress technology for steel structures, the construction of the anchoring components is complex, the stiffness of the turning components is low, and the position of the turning blocks is prone to shift during the prestress tensioning process, resulting in an increase in prestress eccentricity, so that the final structure stress does not conform to the design, and the overall construction is cumbersome and has poor corrosion resistance, and the later maintenance cost is high. During use, it is easy to cause a decrease in prestress, increasing the safety hazard. Summary of the Utility Model

[0006] In order to solve the problems existing in the above-mentioned prior art, an external prestress strengthening device for long-span steel structures is proposed.

[0007] The technical solution for the utility model to solve the technical problems is: an external prestress strengthening device for long-span steel structures, including two groups of turning components arranged in parallel, the turning components are installed at the bottom of the steel beam; two groups of anchoring components, the anchoring components are respectively arranged at the tops of both ends of the steel beam; a prestressed steel bundle is connected between the two anchoring components, and the middle part of the prestressed steel bundle passes through the two turning components in sequence.

[0008] Preferably, the steel beam is an I-shaped steel beam, including a steel beam web, the top of the steel beam web is connected to the upper flange of the steel beam, and the bottom of the steel beam web is connected to the lower flange of the steel beam; a group of prestressed reinforcement devices are respectively provided on the front and rear sides of the steel beam web.

[0009] Preferably, the steering assembly includes a U-shaped fixing plate, which is clamped on the lower flange of the steel beam. Several threaded holes are provided on the top and bottom plates of the U-shaped fixing plate, and corresponding through holes are provided on the lower flange of the steel beam. Fixing bolts pass through the threaded holes to fix the U-shaped fixing plate to the lower flange of the steel beam; Several transverse stiffening ribs are provided on the top plate of the U-shaped fixing plate perpendicular to the prestressed steel bundle, and a steering tube passes through the middle of the transverse stiffening ribs, and the prestressed steel bundle passes through the steering tube to achieve the application of prestress.

[0010] Preferably, two groups of longitudinal stiffening ribs are further connected to the top plate of the U-shaped fixing plate, the longitudinal stiffening ribs are arranged perpendicular to the transverse stiffening ribs, and the steering tube is arranged between the two longitudinal stiffening ribs.

[0011] Preferably, both ends of the steering tube are provided with flared openings for passing through the prestressed steel bundle.

[0012] Preferably, the first tenons are fixedly connected to the top plate at the open end of the U-shaped fixing plate, and the first tenons on the prestressed reinforcement devices on the front and rear sides of the steel beam web and the steel beam web between the two first tenons are connected by bolts.

[0013] Preferably, the anchoring assembly includes an anchoring plate, which is bolted to the bottom of the upper flange of the steel beam; the bottom of the anchoring plate is fixedly connected to the anchoring base, and the anchoring base is connected to an anchor block with a fixed through hole; the two ends of the prestressed steel bundle are clamped with anchor clips, the prestressed steel bundle passes through the fixed through hole, and the ends of the prestressed steel bundle are clamped on the anchor block through the anchor clips.

[0014] Preferably, one end of the anchor plate is connected to the second tenon, and the second tenons on the prestressed reinforcement devices on the front and rear sides of the steel beam web and the steel beam web between the two second tenons are connected by bolts.

[0015] Preferably, a pad groove perpendicular to the fixing through hole is opened on the anchor block at the top of the fixing through hole, a pad is placed on the pad groove, and an outward-expanding trumpet-shaped slot is opened on the pad corresponding to the position of the fixing through hole for clamping the anchor clip.

[0016] Preferably, the anchoring clip comprises an upper clip and a lower clip, and the upper clip and the lower clip are clamped on the prestressed steel bundle via a clamping ring.

[0017] Compared with the existing technology, the above technical solution has the following advantages or beneficial effects:

[0018] 1. The utility model realizes the prestress application to the steel beam through the steering component and the anchoring component. The structures of the steering component and the anchoring component are simple, which is convenient for workers to construct. By fixing the steering component to the lower flange and the web of the steel beam respectively, the possibility of the steering component shifting during prestress application is reduced, and the potential safety hazard is decreased.

[0019] 2. The utility model improves the stability of prestress application by arranging a set of prestress reinforcement devices on each side of the steel beam, and prevents the change of structural stress caused by the damage of a set of prestress reinforcement devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall structural schematic diagram of a large-span steel structure external prestress reinforcement device of the utility model.

[0021] Figure 2 is the external view schematic diagram of the steering component.

[0022] Figure 3 is the cross-sectional view of the steering component.

[0023] Figure 4 is the external view schematic diagram of the anchoring component.

[0024] Figure 5 is the cross-sectional view of the anchoring component.

[0025] Figure 6 is the structural schematic diagram of the anchor block of the anchoring component.

[0026] Figure 7 is the structural schematic diagram of the anchoring wedge of the anchoring component.

[0027] Figure 8 is the structural schematic diagram of the backing plate of the anchoring component.

[0028] DESCRIPTION OF THE REFERENCE NUMERALS:

[0029] 01, upper flange of the steel beam; 02, web of the steel beam; 03, lower flange of the steel beam; 04, prestressed steel strand; 10, steering component; 11, U-shaped fixing plate; 12, first tenon; 13, longitudinal stiffening rib; 14, transverse stiffening rib; 15, steering pipe; 16, first tenon bolt hole; 17, fixing plate bolt hole; 18, outer flared opening; 20, anchoring component; 21, anchoring plate; 22, second tenon; 23, anchoring plate bolt hole; 24, second tenon bolt hole; 25, anchoring base; 26, anchor block; 27, fixing through hole; 28, anchor block groove; 29, backing plate; 30, anchoring wedge; 31, upper wedge; 32, lower wedge; 33, snap ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to clearly illustrate the technical features of this solution, the following will elaborate on the present utility model in detail through specific embodiments and in conjunction with its accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. In addition, the present utility model may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. The present utility model omits the description of well-known components, processing technologies, and processes to avoid unnecessarily limiting the present utility model. The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in specific situations.

[0031] Referring to Figures 1 to 8 , a large-span steel structure external prestressing reinforcement device provided in this embodiment includes a turning assembly 10, an anchoring assembly 20, and an external prestressing steel strand 04.

[0032] Figure 2 As shown, the turning assembly 10 includes a U-shaped fixing plate 11, longitudinal stiffeners 13, trapezoidal transverse stiffeners 14, and a turning tube 15. The turning assembly 10 includes a U-shaped fixing plate 11. The U-shaped fixing plate 11 is clamped under the lower flange 3 of the steel beam. A number of fixing plate threaded holes 17 are opened on the top plate and bottom plate of the U-shaped fixing plate 11. Corresponding through holes are opened on the lower flange 3 of the steel beam. Bolts pass through the fixing plate threaded holes 17 to fix the U-shaped fixing plate 11 to the lower flange 3 of the steel beam; a number of transverse stiffeners 14 perpendicular to the prestressing steel strand 04 are provided on the top plate of the U-shaped fixing plate 11. A turning tube 15 runs through the middle of the transverse stiffeners 14, and the prestressing steel strand 04 passes through the turning tube 15 to apply prestress.

[0033] The U-shaped fixing plate 11 has an inner groove with the same height and width as the lower flange 03 of the steel beam. It is clipped onto the lower flange 03 of the steel beam, and multiple fixing plate bolt holes 17 are provided on the top and bottom plates of the U-shaped fixing plate 11. The plate is connected to the lower flange 03 of the steel beam using high-strength bolts. A first tenon 12 is provided at the open end of the U-shaped fixing plate 11, and multiple first tenon bolt holes 16 are provided in the first tenon 12. During installation, the first tenon 12 fits against the steel beam web 02 and holes are punched at corresponding positions on the steel beam web 02. The first tenons 12 of the steering assemblies 10 corresponding to both sides of the steel beam web 02 are fixed to the steel beam web 02 using high-strength bolts. Trapezoidal transverse stiffening ribs 14 are evenly arranged on the longitudinal centerline of the top plate of the U-shaped fixing plate 11, and two longitudinal stiffening ribs 13 are provided between the transverse stiffening ribs 14 along both sides of the upper ends of the transverse stiffening ribs 14.

[0034] like Figure 3 As shown, the steering tube 15 is positioned along the longitudinal centerline of the U-shaped fixing plate 11 on the transverse stiffeners 14 and extends through each transverse stiffener 14. Trumpet-shaped flares 18 are provided at both ends of the steering tube 15 to facilitate the passage of the prestressed steel strands 04. A 2mm thick polytetrafluoroethylene sheet is attached to the inner wall of the steering tube 15 using resin adhesive. The thick polytetrafluoroethylene sheet reduces friction between the prestressed steel strands 04 and the steering tube 15, minimizing prestress loss.

[0035] like Figures 4 to 8 As shown, the anchoring assembly 20 of the extracorporeal prestressed reinforcement device includes an anchoring plate 21 , an anchoring base 25 , an anchor block 26 , a pad 29 and an anchoring clip 30 .

[0036] like Figure 4 As shown, the anchor plate 21 has multiple anchor plate bolt holes 23 on both sides, and a second tenon 22 is provided at one end close to the steel beam web 02. During installation, the anchor plate 21 is attached to the lower side of the upper flange 01 of the steel beam and connected using high-strength bolts. The second tenon 22 is attached to the steel beam web 02 and is fixed to the steel beam web 02 using high-strength bolts passing through the second tenon bolt holes 24 on both sides of the steel beam web 02.

[0037] The anchor base 25 is arranged at the center position of the lower side of the anchor plate 21 and has a triangular structure. The anchor base 25 and the anchor block 26 can be prefabricated as a whole or welded on site. The two are in an I-shaped structure when viewed from above. When the anchor block 26 is prefabricated in the factory, the anchor block 26 is arranged perpendicular to the steel bundle between the anchor bases 25 according to the design angle of the prestressed steel bundle 04. A fixing through hole 27 is opened in the center of the anchor block 26 along the direction of the prestressed steel bundle 04. The direction of the fixing through hole 27 is coaxial with the prestressed steel bundle 04, and an anchor block groove 28 is opened on the anchoring side for clamping the pad 29. The pad 29 is clamped in the anchor block groove 28 and welded.

[0038] like Figure 8As shown, the backing plate 29 is perforated at the axial center position, and the direction is coaxial with the perforation direction of the anchor block 26. An outer-wide flared card slot is opened at the perforation head end outside the perforation of the backing plate 29, and the inner wall of the card slot fits with the outer wall of the anchoring clip 30, so that the force on the anchoring clip 30 is uniform when it is clamped.

[0039] As Figure 7 shown, the anchoring clip 30 is composed of an upper clip 31, a lower clip 32 and a snap ring 33. The snap ring 33 clamps the two clips on the prestressed steel bundle 04. The anchoring clip 30 is integrally in a conical structure, the inner diameter of which is smaller than the outer diameter of the prestressed steel bundle 04, the major diameter of the conical structure is larger than the major diameter of the perforation of the backing plate 29, and the minor diameter is smaller than the inner diameter of the perforation of the anchor block 26. The prestressed steel bundle 04 is anchored at the backing plate 29 of the anchoring assembly 20 through the anchoring clip 30 clamped around it.

[0040] To ensure the durability of the device, all steel components and bolts need to be rust-proofed. First, remove the oil, rust and various sundries on the surface of the components, and then use shot blasting or peening technology for rust removal to ensure that its surface is smooth and ready to receive further anti-corrosion treatment.

[0041] The installation work process of the present utility model is as follows:

[0042] First, according to the design requirements, each part of the device is prefabricated in the factory.

[0043] For the device of the present utility model, a pair of anchoring assemblies 20 are arranged at both ends of the steel beam, and a pair of steering assemblies 10 are arranged at the one-third and three-fourths positions at the bottom of the steel beam.

[0044] Determine the positions of the anchoring assembly 20 and the steering assembly 10 on the steel beam, and open holes at the corresponding positions on the steel beam according to the bolt holes on the U-shaped fixing plate 11 and the anchoring plate 21, as well as on the first tenon 12 and the second tenon 22.

[0045] Fit the anchoring plates 21 of the two-end anchoring assemblies 20 to the lower side of the upper flange 01 of the steel beam, and fit the second tenons 22 on the anchoring plates 21 to the web 02 of the steel beam, and use high-strength bolts for connection. Clamp the fixing plate of the steering assembly 10 to the lower flange 03 of the steel beam, and fit the first tenon 12 on the U-shaped fixing plate 11 to the web 02 of the steel beam, and use high-strength bolts for connection. When the first tenon 12 is connected, the bolts pass through the web 02 of the steel beam to fix the first tenons 12 on both sides of the device together with the web 02 of the steel beam.

[0046] When tightening the bolt connection, ensure the cleanliness of the connection part to ensure that there is no rust and oil residue. At the same time, avoid over-tightening the bolts, as over-tightening may cause the bolts and connecting parts to bear excessive loads, resulting in component damage and affecting the safety and stability of the entire structure.

[0047] After the various components of the device are installed, one end of the prestressed steel bundle 04 is passed through the anchor assembly 20 and the steering assembly 10 in sequence. The anchor clip 30 is clamped around the prestressed steel bundle 04 and fixed to the anchor assembly 20 at one end. Then, the anchor clip 30 is clamped at the other end and prestressed. After the prestress requirement is met, the position of the anchor clip 30 is adjusted so that it moves into the slot of the pad 29. As the prestressed steel bundle 04 is tightened, the anchor clip 30 will be tightly fastened to the slot of the pad 29, and the anchoring is completed. It should be noted that when performing prestressing, the devices on both sides of the web should be tensioned simultaneously to prevent uneven stress distribution in the steel beam.

[0048] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A large-span steel structure external prestressing reinforcement device, characterized in that, Comprising: Two sets of steering components (10) arranged in parallel, and the steering components (10) are installed at the bottom of the steel beam; Two sets of anchoring components (20), and the anchoring components (20) are respectively arranged at the tops of both ends of the steel beam; a prestressed steel strand (04) is connected between the two anchoring components (20), and the middle of the prestressed steel strand (04) sequentially passes through the two steering components (10).

2. The large-span steel structure external prestressing reinforcement device according to claim 1, characterized in that: The steel beam is an I-shaped steel beam, including a steel beam web (2), the top of the steel beam web (2) is connected to a steel beam upper flange (1), and the bottom of the steel beam web (2) is connected to a steel beam lower flange (3); a set of prestressed reinforcement devices are respectively arranged on the front side and the rear side of the steel beam web (2).

3. A long-span steel structure external prestressing reinforcement device according to claim 2, characterized in that: The steering component (10) includes a U-shaped fixing plate (11), the U-shaped fixing plate (11) is clamped on the steel beam lower flange (3), a plurality of fixing plate threaded holes (17) are opened on the top plate and the bottom plate of the U-shaped fixing plate (11), through holes are correspondingly opened on the steel beam lower flange (3), and bolts pass through the fixing plate threaded holes (17) to fix the U-shaped fixing plate (11) to the steel beam lower flange (3); a plurality of transverse stiffening ribs (14) are arranged perpendicular to the prestressed steel strand (04) on the top plate of the U-shaped fixing plate (11), a steering pipe (15) penetrates through the middle of the transverse stiffening ribs (14), and the prestressed steel strand (04) passes through the steering pipe (15) to apply prestress.

4. The external prestressing reinforcement device for long-span steel structures according to claim 3, characterized in that: Two sets of longitudinal stiffening ribs (13) are further connected to the top plate of the U-shaped fixing plate (11), the longitudinal stiffening ribs (13) are arranged perpendicular to the transverse stiffening ribs (14), and the steering pipe (15) is arranged between the two longitudinal stiffening ribs (13).

5. The large-span steel structure external prestressing reinforcement device according to claim 3, wherein: Outer flared openings (18) for facilitating the penetration of the prestressed steel strand (04) are arranged at both ends of the steering pipe (15).

6. The large-span steel structure external prestressing reinforcement device according to claim 3, wherein: A first tenon (12) is fixedly connected to the top plate at the open end of the U-shaped fixing plate (11), and the first tenons (12) on the prestressed reinforcement devices on the front side and the rear side of the steel beam web (2) and the steel beam web (2) between the two first tenons (12) are connected by bolts.

7. A large-span steel structure external prestressing reinforcement device according to claim 1, characterized in that: The anchoring component (20) includes an anchoring plate (21), the anchoring plate (21) is bolted to the bottom of the steel beam upper flange (1); an anchoring base (25) is fixedly connected to the bottom of the anchoring plate (21), and an anchor block (26) with a fixing through hole (27) is connected to the anchoring base (25); both ends of the prestressed steel strand (04) are clamped with anchoring wedges (30), the prestressed steel strand (04) passes through the fixing through hole (27), and the end of the prestressed steel strand (04) is clamped on the anchor block (26) by the anchoring wedges (30).

8. A long-span steel structure external prestressing reinforcement device according to claim 7, characterized in that: One end of the anchoring plate (21) is connected to a second tenon (22), and the second tenons (22) on the prestressed reinforcement devices on the front side and the rear side of the steel beam web (2) and the steel beam web (2) between the two second tenons (22) are connected by bolts.

9. A large-span steel structure external prestressing reinforcement device according to claim 7, characterized in that: An anchor block groove (28) perpendicular to the fixing through hole (27) is opened on the anchor block (26) at the top end of the fixing through hole (27), a backing plate (29) is placed on the anchor block groove (28), and the backing plate (29) is provided with an outer flared trumpet-shaped card slot corresponding to the position of the fixing through hole (27) for clamping the anchoring wedges (30).

10. A long-span steel structure external prestressing reinforcement device according to claim 7, characterized in that: The anchoring wedge (30) includes an upper wedge (31) and a lower wedge (32), and the upper wedge (31) and the lower wedge (32) are clamped on the prestressed steel strand (04) through a snap ring (33).

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