External prestress anchoring device for steel box girder

Abstract

The utility model relates to the technical field of bridge processing, and discloses a steel box girder external prestressing anchoring device which comprises a box girder, a plurality of steel strands are arranged in the box girder, clamping pieces are sleeved on the surfaces of the steel strands, and the steel strands are connected with an anchor backing plate in a sliding mode. The secondary fixing mechanism is arranged on one side of the clamping piece and is matched with the steel strand; the locking mechanism is arranged on one side of the secondary fixing mechanism and is matched with the secondary fixing mechanism; according to the device, the anchor bearing plate is pulled through the clamping piece and the steel strand, after the clamping piece is fixed, the steel strand is secondarily fixed through the secondary fixing mechanism, the clamping piece is prevented from loosening, finally, the secondary fixing mechanism is locked through the locking mechanism, and loosening cannot occur during pulling; the steel box girder external prestress anchoring device has the advantages of being large in supporting area, high in structural anti-pressure capacity, not prone to deflection deformation, plate welding seam cracking and the like, and solves the problems that an existing steel box girder external prestress anchoring device is small in stress area, poor in structural anti-pressure capacity, prone to deflection deformation, plate welding seam cracking and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge processing, and in particular relates to an external prestressed anchoring device for a steel box beam. Background Art

[0002] Steel box girders, also known as steel plate box girders, are a common structural form for long-span bridges. They are generally used on bridges with larger spans. Because of their box-like appearance, they are called steel box girders. They are generally made up of a top plate, bottom plate, web, transverse diaphragm, longitudinal diaphragm, and stiffening ribs connected by a fully welded method. The top plate is an orthogonal bridge deck composed of a cover plate and longitudinal stiffening ribs. Box girder anchor rods are a type of rod used to reinforce box girder structures. They are usually composed of steel rods, anchors, and anchoring members. By fixing the steel rods to the anchoring members inside or outside the box girder and using uniform prestressing to generate tension, the box girder is fixed. Box girder anchor rods can evenly distribute force inside and outside box girder structures such as high-rise buildings or bridges, avoiding structural instability caused by external forces and deformation, enhancing the resistance and stability of the components, and improving the bearing capacity of the box girder structure. The use of box girder anchor rods can reduce the deformation of reinforced concrete box girders after being subjected to large loads, thereby enhancing their bearing capacity.

[0003] After searching, a Chinese patent disclosed an external prestressed anchoring device for steel box girders (publication number CN218951941U). This patented technology can solve the problems of the existing technology of using a single anchor plate to fix the anchor end of the prestressed steel strand. Due to the small stress-bearing area and weak structural compressive capacity of the prestressed anchor plate and the steel box top plate, they are prone to flexural deformation and cracking of the plate welds. However, the technical solution of the above patent document was found in the actual construction site:

[0004] 1. The existing anchoring structure uses an anchor plate to fix the anchor end of the prestressed steel strand. During the process of prestressing the external prestress of many steel box girders, the prestressed anchor plate and the top plate of the steel box girder are prone to flexural deformation, cracking of the plate welds, and other defects due to their small stress-bearing area and weak structural compressive capacity.

[0005] 2. The existing anchoring mechanism cannot effectively fix the anchor nut during use, which can easily cause the anchor nut to loosen due to tension or external disturbance during use, affecting the prestressing effect of the steel strand;

[0006] Therefore, the present invention designs an external prestressed anchoring device for a steel box girder to solve the problems existing in the above-mentioned prior art. Utility Model Content

[0007] (1) Technical problems solved

[0008] In view of the deficiencies in the prior art, the utility model provides an external prestressed anchoring device for steel box girders, which has the advantages of stable connection, large supporting area, strong structural compressive resistance, and is not prone to defects such as flexural deformation and cracking of plate welds. It solves the problems existing in the existing external prestressed anchoring device for steel box girders, such as the prestressed anchor plate and the top plate of the steel box girder being prone to defects such as flexural deformation and cracking of plate welds during the process of tensioning the external prestressed steel girder due to the small force-bearing area and weak structural compressive resistance.

[0009] (2) Technical solution

[0010] In order to achieve the purpose of the above-mentioned external prestressed anchoring device for steel box beams, the present invention provides the following technical solutions:

[0011] A steel box girder in vitro prestressed anchoring device comprises: a box girder, wherein a plurality of steel strands are arranged in the box girder, and the surfaces of the plurality of steel strands are all sleeved with clips, an anchor plate is fixedly connected to the inner wall of the box girder, and the plurality of steel strands are all slidably connected to the inner wall of the anchor plate; a secondary fixing mechanism, wherein the secondary fixing mechanism is arranged on one side of the clip for secondary fixing of the steel strands and is used in conjunction with the steel strands; and a locking mechanism, wherein the locking mechanism is arranged on one side of the secondary fixing mechanism for locking the secondary fixing mechanism and is used in conjunction with the secondary fixing mechanism.

[0012] As a preferred solution of the external prestressed anchoring device for steel box beams described in the utility model:

[0013] There are multiple groups of secondary fixing mechanisms, and each group of secondary fixing mechanisms includes a bevel extrusion block sleeved on the surface of the steel strand, a bevel extrusion ring is slidably connected to the surface of the bevel extrusion block, and the bevel extrusion ring is sleeved on the surface of the steel strand. The inner wall of the bevel extrusion ring is relatively close to the surface of the bevel extrusion block, and the side end of the clip is fixedly connected with a threaded interface, and the bevel extrusion ring and the bevel extrusion block are both arranged on the inner wall of the threaded interface.

[0014] Based on the above technical features: the steel strand can be fixed for a second time through the secondary fixing mechanism, making the fixation of the steel strand more stable and preventing it from loosening due to tension.

[0015] As a preferred solution of the in vitro prestressed anchoring device for a steel box beam described in the utility model: an extrusion cap is threadedly connected to the surface of the threaded interface, and the inclined extrusion block is sleeved on the circumferential surface of the steel strand.

[0016] Based on the above technical features: the extrusion cap can be used to squeeze and fit the bevel extrusion ring and the bevel extrusion block, making the fixation more stable. At the same time, it can be shielded to prevent water from entering and reduce the possibility of contact corrosion.

[0017] As a preferred solution of the in vitro prestressed anchoring device for a steel box beam described in the utility model: an extended extrusion block is fixedly connected to the inner wall of the extrusion cap, and the extended extrusion block is fitted and abutted against one end of the inclined extrusion ring.

[0018] Based on the above technical features: by extending the extrusion block, the pushing force can be increased and the fixing stability can be increased.

[0019] As a preferred solution of the in vitro prestressed anchoring device for a steel box girder described in the utility model: a connecting plate is provided on one side of the box girder, and the connecting plate is fixedly connected to a plurality of clips.

[0020] Based on the above technical features: multiple clips can be connected through a connecting plate to increase the extrusion pushing area and prevent deformation and damage.

[0021] As a preferred solution of the in vitro prestressed anchoring device for a steel box girder described in the utility model: the locking mechanism is provided with multiple groups, each group of the locking mechanism includes multiple push springs fixedly connected to the side end of the connecting plate, and one end of the multiple push springs is fixedly connected to a hexagonal locking ring, and the hexagonal locking ring is in contact with the surface of the extrusion cap.

[0022] Based on the above technical features: the locking mechanism can lock the rotation of the extrusion cap to prevent the extrusion cap from rotating loose.

[0023] As a preferred solution of the in vitro prestressed anchoring device for steel box beams described in the utility model: the side end of the connecting plate is fixedly connected to multiple telescopic rods, the side end of the hexagonal locking ring is fixedly connected to the multiple telescopic rods, and the pushing spring is sleeved on the circumferential surface of the telescopic rod.

[0024] Based on the above technical features: the push spring can be supported by the telescopic rod to prevent the push spring from undergoing lateral elastic deformation and causing damage.

[0025] As a preferred solution of the in vitro prestressed anchoring device for a steel box girder described in the utility model: the side end of the anchor plate is fixedly connected to a support frame, and the inner wall of the support frame is triangular.

[0026] Based on the above technical features: the anchor plate can be supported by the support frame to prevent the support frame from being damaged by elastic deformation due to tension.

[0027] (3) Beneficial effects

[0028] Compared with the prior art, the present invention provides an external prestressed anchoring device for a steel box girder, which has the following beneficial effects:

[0029] 1. Through the setting of the secondary fixing mechanism, when using this device for anchoring, the anchor plate is pulled by the clip and the steel strand. After the clip is fixed, the steel strand is fixed by the secondary fixing mechanism to prevent the clip from loosening;

[0030] 2. Through the setting of the locking mechanism, the secondary fixing mechanism is locked by the locking mechanism to prevent loosening, so that the clip can be stably fixed and will not loosen when pulled;

[0031] 3. When the hexagonal locking ring is pushed to fix the surface of the extrusion cap by the push spring, the push spring is prone to lateral elastic deformation and damage. At this time, the push spring is supported by the telescopic rod so that the push spring will not be damaged by lateral elastic deformation; the purpose of prestressed anchoring of the steel strand outside the steel box girder is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural diagram of the box girder of the utility model from the main viewing angle;

[0033] Figure 2 This is a schematic diagram of the structure of the box girder of the utility model from the side view angle

[0034] Figure 3 It is a cross-sectional view of the end of the box beam of the utility model;

[0035] Figure 4 This is a partial enlarged view of the box girder A of the present invention;

[0036] Figure 5 This is a partial enlarged view of the box girder B of the utility model

[0037] Figure 6 This is a partial enlarged view of the box girder C of the utility model

[0038] Figure 7 This is a partial enlarged view of the D part of the box girder of the utility model

[0039] Figure 8 It is a cross-sectional view of the inclined surface extrusion block and the inclined surface extrusion ring of the box beam of the utility model.

[0040] In the figure: 1. Box girder; 2. Steel strand; 3. Clip; 4. Secondary fixing mechanism; 401. Threaded interface; 402. Inclined extrusion block; 403. Inclined extrusion ring; 404. Extrusion cap; 405. Extended extrusion block; 5. Locking mechanism; 501. Push spring; 502. Hexagonal locking ring; 503. Telescopic rod; 6. Connecting plate; 7. Support frame; 8. Anchor plate. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Example 1: Please refer to Figure 1-8 , the utility model provides a technical solution:

[0043] An external prestressed anchoring device for a steel box beam, comprising:

[0044] A box beam 1, wherein a plurality of steel strands 2 are provided on the inner wall of the box beam 1, and a clip 3 is provided on the surface of each of the plurality of steel strands 2, and the steel strands 2 are also slidably connected to an anchor plate 8 fixedly provided on the inner wall of the box beam 1;

[0045] The secondary fixing mechanism 4 is provided on one side of the clamping piece 3 and is used for secondary fixing of the steel strand 2;

[0046] A locking mechanism 5 is provided on one side of the secondary fixing mechanism 4 and is used to lock the secondary fixing mechanism 4;

[0047] During use, the steel strand 2 is arranged inside the box girder 1 according to the design requirements, and the free end of the steel strand 2 is passed through the anchor plate 8, and the secondary fixing mechanism 4 is installed on the outside of the anchor plate 8. After prestressing, the steel strand 2 is fixed by the secondary fixing mechanism 4, and finally the secondary fixing mechanism 4 is locked by the locking mechanism 5 to achieve the prestressed anchoring effect.

[0048] It is worth noting that the box beam 1 and the clip 3 are both well-known technologies to those skilled in the art, and will not be described in detail here.

[0049] Example 2: Figure 4 、 Figure 6 、 Figure 7 and Figure 8 As shown, the secondary fixing mechanism 4 is provided with multiple groups, and each group of secondary fixing mechanism 4 includes

[0050] An inclined extrusion block 402 is sleeved on the outer surface of the steel strand 2;

[0051] The bevel extrusion ring 403 is sleeved on the outer surface of the steel strand 2 and is slidably connected to the surface of the bevel extrusion block 402. The inner wall of the bevel extrusion ring 403 is closely fitted to the outer surface of the bevel extrusion block 402.

[0052] The extrusion cap 404 is threadedly connected to the threaded interface 401 provided at the outer end of the clip 3, and the inclined extrusion ring 403 and the inclined extrusion block 402 are both provided on the inner wall of the threaded interface 401;

[0053] Specifically, when in use, the inclined extrusion block 402 is sleeved on the circumferential surface of the steel strand 2. When the steel strand 2 is fixed for the second time, the extrusion cap 404 is rotated, and the extrusion cap 404 squeezes the inclined extrusion ring 403 through the thread of the threaded interface 401. At this time, the inclined extrusion ring 403 pushes the inclined extrusion block 402 to fit on the surface of the steel strand 2 for fixation, thereby increasing the fixing effect.

[0054] As a preferred embodiment, an extension extrusion block 405 is fixedly connected to the inner wall of the extrusion cap 404, and the extension extrusion block 405 is in contact with one end of the inclined extrusion ring 403;

[0055] Specifically, during use, when the extrusion cap 404 extrudes the inclined extrusion ring 403 , the extrusion effect can be increased by extending the extrusion block 405 .

[0056] As a preferred embodiment, a connecting plate 6 is further provided on one side of the box beam 1, and the connecting plate 6 is fixedly connected to the plurality of clips 3;

[0057] Specifically, during use, multiple clips 3 can be combined through the connecting plate 6 to increase the pushing area and prevent extrusion damage due to the small contact area of the pushing force; at the same time, the connecting plate 6 also plays the role of extruding the inclined extrusion block 402, ensuring that when the inclined extrusion ring 403 squeezes the inclined extrusion block 402, the inclined extrusion block 402 can be attached to the surface of the steel strand 2 for fixation.

[0058] Example 3: Figure 5 、 Figure 6 and Figure 7 As shown, the locking mechanism 5 is provided with multiple groups, and each group of locking mechanisms 5 includes

[0059] A plurality of push springs 501 , wherein the push springs 501 are fixedly connected to the outer end of the connecting plate 6 ;

[0060] A hexagonal locking ring 502 is fixedly disposed on the outer end of the push spring 501 and fits closely with the surface of the extrusion cap 404;

[0061] Specifically, when in use, after the secondary fixing mechanism 4 is fixed, the hexagonal locking ring 502 is pushed to fit the surface of the extrusion cap 404 by the pushing spring 501, so that the extrusion cap 404 cannot rotate. At this time, after the extrusion cap 404 cannot rotate, the fixing effect is stable, which can effectively prevent the extrusion cap 404 from rotating and loosening.

[0062] As a preferred embodiment, the side ends of the connecting plate 6 are further fixedly connected to a plurality of telescopic rods 503, the telescopic rods 503 are fixedly connected to the hexagonal locking rings 502, and the push springs 501 are sleeved on the circumferential surfaces of the telescopic rods 503;

[0063] Specifically, during use, when the push spring 501 pushes the hexagonal locking ring 502 to fix the surface of the extrusion cap 404, the push spring 501 is prone to lateral elastic deformation and damage. At this time, the push spring 501 is supported by the telescopic rod 503, so that the push spring 501 will not be damaged by lateral elastic deformation.

[0064] As a preferred embodiment, the side end of the anchor plate 8 is fixedly connected to a support frame 7, and the inner wall of the support frame 7 is triangular;

[0065] Specifically, when in use, the anchor plate 8 can be supported by the support frame 7 to prevent deformation and damage due to pulling.

[0066] When the external prestressed anchoring device for steel box beams of the utility model is used:

[0067] When the steel strand 2 is fixed for the second time, the extrusion cap 404 can be rotated at this time, and the extrusion cap 404 squeezes the inclined extrusion ring 403 through the thread of the threaded interface 401, and pushes the extended extrusion block 405 to extrude the inclined extrusion ring 403 through the extrusion cap 404. At this time, the inclined extrusion ring 403 pushes the inclined extrusion block 402 to fit the surface of the steel strand 2 for fixation, and the steel strand 2 is extruded and fixed for the second time. The support frame 7 supports the anchor plate 8 to prevent deformation and damage. The connecting plate 6 connects multiple clips 3 to increase the pushing area to prevent extrusion damage due to the small contact area of the pushing force.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus. In the absence of further restrictions, the elements defined by the sentence "comprising an in vitro prestressed anchoring device for a steel box girder" do not exclude the presence of other identical elements in the process, method, article or apparatus comprising the elements.

[0069] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An external prestressed anchoring device for a steel box girder, characterized by: include: A box beam (1), wherein a plurality of steel strands (2) are arranged in the box beam (1), a clip (3) is sleeved on the surface of each of the plurality of steel strands (2), and the steel strands (2) are also slidably connected to an anchor plate (8) arranged in the box beam (1); A secondary fixing mechanism (4) is provided on one side of the clamping piece (3) and is adapted to fit the steel strand (2); A locking mechanism (5) is provided on one side of the secondary fixing mechanism (4) and is adapted to the secondary fixing mechanism (4); The secondary fixing mechanism (4) is provided with multiple groups, and each group of the secondary fixing mechanism (4) includes An inclined extrusion block (402) is sleeved on the outer surface of the steel strand (2); An inclined surface extrusion ring (403) is sleeved on the outer surface of the steel strand (2) and is slidably connected to the inclined surface extrusion block (402); The extrusion cap (404) is threadedly connected to a threaded interface (401) provided at the outer end of the clip (3), and the inclined surface extrusion ring (403) and the inclined surface extrusion block (402) are both provided on the inner side of the threaded interface (401).

2. The external prestressed anchoring device for a steel box girder according to claim 1, characterized in that: An extended extrusion block (405) is provided in the extrusion cap (404), and the extended extrusion block (405) is fitted and abutted against one end of the inclined extrusion ring (403).

3. The external prestressed anchoring device for a steel box girder according to claim 1, characterized in that: A connecting plate (6) is provided on one side of the box beam (1); the connecting plate (6) is fixedly connected to the clip (3) and is adapted to the inclined extrusion block (402).

4. The external prestressed anchoring device for a steel box beam according to claim 3, characterized in that: The locking mechanism (5) is provided in multiple groups, and each group of the locking mechanism (5) includes A plurality of push springs (501) are fixedly connected to the outer end of the connecting plate (6); The hexagonal locking ring (502) is fixedly arranged on the outer end of the push spring (501) and is in contact with the surface of the extrusion cap (404).

5. The external prestressed anchoring device for a steel box beam according to claim 4, characterized in that: The outer end of the connecting plate (6) is further provided with a plurality of telescopic rods (503), the other ends of the telescopic rods (503) are connected to the hexagonal locking ring (502), and the pushing spring (501) is sleeved on the outer side of the telescopic rods (503).

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