Prestressed anchorage device for bridge construction

Abstract

This utility model belongs to the field of anchorages, specifically a prestressed anchorage for bridge construction. It includes a steel pad, with multiple fixing holes arranged in a double-row, staggered, and inclined configuration on the upper surface of the steel pad. Multiple bent steel cables are slidably mounted on one side of the steel pad, with each cable's two ends slidably connected to two corresponding fixing holes. A fastening ring is slidably mounted inside each fixing hole, and each fastening ring is slidably connected to one end of its adjacent steel cable, forming a locking and limiting effect on that end. Multiple tightening grooves are provided on the outer surface of each fastening ring, and a protective tube is provided at the bend of each steel cable. This utility model, through the multiple fixing holes arranged in a double-row, staggered, and inclined configuration on the upper surface of the steel pad, achieves a more uniform stress distribution between the steel cables and the steel pad, reducing localized stress peaks and increasing the peak tensile force exerted on the bridge by the steel pad and the steel cables.

Description

Technical Field

[0001] This utility model belongs to the field of anchorage technology, and in particular relates to a prestressed anchorage for bridge construction. Background Technology

[0002] A prestressed anchor is an anchor used for prestressing concrete during engineering construction. It is pre-installed and positioned, and its end face is set up to provide stability for the jacks during tensioning. Typically, the tensioning end of a prestressed steel strand anti-buoyancy anchor requires a steel strand concrete beam or steel beam. The prestressed steel strands are then tensioned on the outside of the beam, and the prestressed anchor base is used to fix the prestressed anchor.

[0003] Compared with existing technologies: First, existing prestressed anchors typically use double steel plates with a single row of fixing holes on each plate, which is inconvenient to install and prone to uneven stress, causing the steel plates to break. Secondly, the existing anchorages lack protection at the points where the steel cables contact the bridge, which can lead to wear and breakage during long-term use. Furthermore, it is difficult to apply lubricant between the protective tube and the steel cable, resulting in severe wear between them. Finally, when the fastening ring moves into the fixing hole and squeezes and limits the steel cable, it is prone to skew, which reduces the fastening ring's ability to limit and clamp the steel cable. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this invention provides a prestressed anchorage for bridge construction. This invention utilizes multiple fixing holes arranged in a double-row, staggered, and inclined configuration on the upper surface of the steel pad to achieve a more uniform stress distribution between the multiple steel cables and the steel pad, reducing localized stress peaks and increasing the peak tensile force exerted on the bridge by the steel pad and multiple steel cables.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a prestressed anchor for bridge construction, comprising a steel pad, wherein the upper surface of the steel pad is provided with a plurality of fixing holes, the plurality of fixing holes being arranged in a double row of staggered and inclined corresponding arrangement; a plurality of bent steel cables are slidably arranged on one side of the steel pad, and the two ends of each steel cable are slidably connected to two corresponding inclined fixing holes respectively; a fastening ring is slidably arranged inside each fixing hole, and each fastening ring is slidably connected to one end of its adjacent steel cable, forming a locking and limiting action on one end of the steel cable; a plurality of tightening grooves are provided on the outer circumference of each fastening ring; and a protective tube is provided at the bent portion of each steel cable.

[0006] Optionally, a buffer layer is provided at the bend of each of the protective tubes between the steel cable and the protective tube.

[0007] Optionally, each of the buffer layers is provided with a limiting ring at both ends between the steel cable and the protective tube. A flexible annular membrane is provided on the inner circular surface of each limiting ring and the steel cable. Lubricating oil is filled between the limiting ring and the flexible annular membrane. Multiple oil outlet holes are provided on the side wall of each flexible annular membrane near the buffer layer.

[0008] Optionally, each of the limiting ring sleeves has multiple snap-fit ​​grooves on the inner circular surface of the buffer layer, and each snap-fit ​​groove has a snap-fit ​​strip slidably disposed inside it, and each snap-fit ​​strip is fixedly connected to the outer circular surface of its adjacent limiting ring sleeve.

[0009] Optionally, a guide ring is slidably provided on one side of each fastening ring on the side wall of the steel pad, each guide ring is slidably connected to its adjacent steel cable, and one end of each guide ring is engaged with its adjacent fixing hole.

[0010] Optionally, each guide ring has multiple pairs of guide plates evenly arranged in a ring shape on its inner bottom surface, and each pair of guide plates is slidably connected to its adjacent tightening groove.

[0011] Optionally, each pair of guide plates is provided with an elastic folding plate at one end near the fastening ring.

[0012] Optionally, multiple elastic folding plates are connected between the multiple guide rings, and each elastic folding plate has multiple connecting holes on its sidewall.

[0013] In summary, compared with existing technologies, the beneficial effects of this solution are as follows: (1) The present invention uses multiple fixing holes arranged in a double row with staggered inclination on the upper surface of the steel pad plate to make the stress distribution between the multiple steel cables and the steel pad plate more uniform, reduce local stress peaks, and increase the peak tension of the steel pad plate and multiple steel cables on the bridge. (2) This utility model can protect the contact area between the steel cable and the bridge by setting up components such as protective tube, buffer layer and limiting ring sleeve. During installation, the steel cable squeezes the flexible ring membrane, so that the lubricant stored between the flexible ring membrane and the oil outlet is squeezed out through multiple oil outlets to form lubrication and anti-slip between the steel cable and the protective tube. (3) The present invention forms a guide for the sliding of the fastening ring inside the fixing hole by setting the guide ring, guide plate and elastic folding plate, thereby ensuring that the multiple fastening rings uniformly squeeze and limit the multiple steel cables. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 3D cross-sectional view at point AA; Figure 4 for Figure 3 Enlarged view of a section at point B; Figure 5 for Figure 3 A magnified view of a section at point C. Figure 6 This is a perspective view of the limiting ring sleeve part of this utility model; Figure 7 This is a perspective view of the guide ring part of this utility model; Figure 8 This is a perspective view of the protective tube component of this utility model.

[0015] In the diagram: 10 steel pad, 11 fixing hole, 12 steel cable, 13 protective tube, 14 buffer layer, 15 limiting ring sleeve, 16 snap-fit ​​groove, 17 snap-fit ​​strip, 18 flexible ring membrane, 19 oil outlet hole, 20 fastening ring, 21 tightening groove, 22 guide ring, 23 guide plate, 24 elastic folding plate, 25 connecting hole. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] Example 1: like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 8As shown, a prestressed anchorage for bridge construction includes a steel plate 10. The upper surface of the steel plate 10 has multiple fixing holes 11 arranged in a double-row, staggered, and inclined configuration. Multiple bent steel cables 12 are slidably mounted on one side of the steel plate 10. Each steel cable 12 has two ends slidably connected to two corresponding inclined fixing holes 11. A fastening ring 20 is slidably mounted inside each fixing hole 11, and each fastening ring 20 is slidably connected to one end of its adjacent steel cable 12, forming a locking and limiting connection on one end of the steel cable 12. Multiple tightening grooves 21 are provided on the outer circumference of each fastening ring 20. During installation, the multiple steel cables 12 are wrapped around the area requiring tension, and then the bent portions of the multiple steel cables 12 are limited by a circular steel beam. Subsequently, the anchorage is... Each end of a plurality of steel cables 12 is inserted into a fixing hole 11 on the end face of a steel pad 10. Then, a plurality of fastening rings 20 are fitted onto one end of each steel cable 12. Finally, a special jack structure is used to stretch one end of the plurality of steel cables 12. After stretching to a predetermined length, the jack is gradually controlled to disengage from the stretching of one end of the plurality of steel cables 12. One end of the plurality of steel cables 12 will drive the fastening rings 20 on their outer rings to move into the interior of the fixing hole 11. Through the conical structure at one end of the fixing hole 11 and the setting of a plurality of tightening grooves 21, a compression limit is formed on one end of the steel cable 12 inside the fixing hole 11. A protective tube 13 is set at the bending part of each steel cable 12. The setting of the protective tube 13 forms an isolation protection between the steel cable 12 and the steel beam, reducing the wear of the bending stress surface of the steel cable 12.

[0018] Furthermore, such as Figure 4 and Figure 6As shown, a buffer layer 14 is provided at the bend of each protective tube 13 between the steel cable 12 and the protective tube 13. The buffer layer 14 can be made of corrosion-resistant rubber or sponge material. The buffer layer 14 serves as a buffer between the steel cable 12 and the protective tube 13. Each end of each buffer layer 14 is provided with a limiting ring 15 between the steel cable 12 and the protective tube 13. A flexible annular membrane 18 is provided on the inner surface of each limiting ring 15 between the limiting ring 15 and the steel cable 12. The flexible annular membrane 18 is made of flexible anti-slip material. The flexible annular membrane 18 increases the contact friction between the steel cable 12 and the protective tube 13, reduces the sliding wear between the steel cable 12 and the protective tube 13, and also serves to protect the steel cable 12 and the protective tube 13. The elastic buffering effect between the protective tubes 13 and the lubricating oil between the limiting ring sleeve 15 and the flexible ring membrane 18 are provided. Each flexible ring membrane 18 has multiple oil outlet holes 19 on its side wall near the buffer layer 14. When the jack stretches one end of the steel cable 12, the steel cable 12 will compress the steel beam and the protective tube 13, thereby compressing the steel cable 12, the limiting ring sleeve 15, and the flexible ring membrane 18. Since the flexible ring membrane 18 is flexible, it deforms under the compression of the steel cable 12 and the protective tube 13, causing the lubricating oil between the limiting ring sleeve 15 and the oil outlet holes 19 to be squeezed out through the multiple oil outlet holes 19 and absorbed and stored through the buffer layer 14, thus forming lubrication between the steel cable 12 and the protective tube 13.

[0019] It should be noted that the oil outlet 19 is only used for lubrication during a single use of the anchor, and is not intended for repeated use over a long period of time.

[0020] Furthermore, such as Figure 6 and Figure 8 As shown, each limiting ring sleeve 15 has multiple snap-fit ​​grooves 16 on the outer surface of the inner circular surface of the buffer layer 14. Each snap-fit ​​groove 16 has a snap-fit ​​strip 17 slidably disposed inside it. Each snap-fit ​​strip 17 is fixedly connected to the outer circular surface of its adjacent limiting ring sleeve 15. The snap-fit ​​grooves 16 and snap-fit ​​strips 17 facilitate the limiting and fixing of the limiting ring sleeve 15 and the flexible ring membrane 18 inside the protective tube 13, effectively preventing the limiting ring sleeve 15 and the flexible ring membrane 18 from slipping out of the inside of the protective tube 13 during installation, thus improving the quality of the anchor.

[0021] Furthermore, such as Figure 5 and Figure 7As shown, each fastening ring 20 has a guide ring 22 slidably disposed on one side of the side wall of the steel pad 10. Each guide ring 22 is slidably connected to its adjacent steel cable 12, and one end of each guide ring 22 is engaged with its adjacent fixing hole 11. When one end of multiple steel cables 12 is stretched, the multiple guide rings 22 can form a sliding limit on the steel cable 12 inside the fixing hole 11. When one end of the steel cable 12 is stretched by the jack, the steel cable 12 can always remain perpendicular to the end face of the steel pad 10 when sliding inside the fixing hole 11. This ensures that the subsequent fastening ring 20 remains perpendicular to the end face of the steel pad 10 when sliding outside the steel cable 12 and following the steel cable 12 into the fixing hole 11. As a result, the compression and limiting of multiple steel cables 12 by multiple fastening rings 20 is more uniform, and the tension of multiple fastening rings 20 on the steel pad 10 is more uniform.

[0022] Furthermore, such as Figure 5 and Figure 7 As shown, each guide ring 22 has multiple pairs of guide plates 23 evenly arranged in a ring shape on its inner bottom surface. Each pair of guide plates 23 is slidably connected to its adjacent tightening groove 21. When multiple fastening rings 20 move into the fixing hole 11 along with the steel cable 12, multiple pairs of guide plates 23 will extend into the interior of multiple tightening grooves 21, forming a guiding effect on the sliding of the fastening rings 20 in the fixing hole 11, preventing the fastening rings 20 from deviating.

[0023] Furthermore, such as Figure 7 As shown, each pair of guide plates 23 is connected to an elastic folding plate 24 at one end near the fastening ring 20. The arrangement of multiple elastic folding plates 24 can form a support between each pair of guide plates 23. When the fastening ring 20 moves into the fixing hole 11 along with the steel cable 12, the multiple tightening grooves 21 are squeezed between the fixing hole 11 and the steel cable 12, and will become narrower. At this time, under the elastic tension of the elastic folding plate 24 itself, it will form an outward support for each pair of guide plates 23, thereby improving the contact between the guide plate 23 and the tightening groove 21, so that the fastening ring 20 and the guide ring 22 can be connected more tightly through the guide plate 23 and the elastic folding plate 24, thereby reducing the probability of the fastening ring 20 becoming loose.

[0024] Example 2: Based on Example 1, further examples are made, such as... Figure 5 and Figure 7As shown, multiple elastic folding plates 24 are connected between multiple guide rings 22. Each elastic folding plate 24 has multiple connecting holes 25 on its side wall. The arrangement of multiple elastic folding plates 24 forms a connection and support between multiple guide rings 22, making the multiple guide rings 22 and elastic folding plates 24 form a stable whole, thereby enhancing the guiding ability of multiple guide rings 22 to the internal sliding steel cable 12. When the anchor is installed, multiple elastic folding plates 24 cooperate with multiple guide rings 22 to form a grid structure, which can increase the connection stability between the anchor and the concrete during concrete pouring. Moreover, through the setting of multiple connecting holes 25, concrete can pass through multiple 25 to form a stable connection between the concrete in each grid, further increasing the stability of the connection between the anchor and the bridge.

[0025] The specification and claims use certain terms to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0026] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0027] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.

Claims

1. A prestressing anchor for bridge construction, comprising a steel backing plate (10), characterized in that, The upper surface of the steel pad (10) is provided with a plurality of fixing holes (11), which are arranged in a double row of staggered and inclined corresponding positions. A plurality of bent steel cables (12) are slidably arranged on one side of the steel pad (10). The two ends of each steel cable (12) are slidably connected to two corresponding inclined fixing holes (11). A fastening ring (20) is slidably arranged inside each fixing hole (11). Each fastening ring (20) is slidably connected to one end of its adjacent steel cable (12) and forms a locking limit on one end of the steel cable (12). A plurality of tightening grooves (21) are provided on the outer circumference of each fastening ring (20). A protective tube (13) is provided at the bent part of each steel cable (12).

2. The prestressing anchor for bridge construction according to claim 1, characterized in that Each of the bends of the protective tube (13) is provided with a buffer layer (14) between the steel cable (12) and the protective tube (13).

3. The prestressing anchor for bridge construction according to claim 2, characterized in that Each buffer layer (14) has a limiting ring (15) at both ends between the steel cable (12) and the protective tube (13). A flexible ring membrane (18) is provided on the inner circular surface of the limiting ring (15) between the limiting ring (15) and the steel cable (12). Lubricating oil is filled between the limiting ring (15) and the flexible ring membrane (18). Each flexible ring membrane (18) has multiple oil outlet holes (19) on the side wall near the buffer layer (14).

4. A prestressed anchorage for bridge construction according to claim 3, characterized in that, Each of the limiting ring sleeves (15) has multiple snap-fit ​​grooves (16) on the inner circular surface of the buffer layer (14) on the outside. Each snap-fit ​​groove (16) has a snap-fit ​​strip (17) slidably disposed inside it. Each snap-fit ​​strip (17) is fixedly connected to the outer circular surface of its adjacent limiting ring sleeve (15).

5. The prestressing anchor for bridge construction as claimed in claim 1, wherein Each of the fastening rings (20) has a guide ring (22) slidably disposed on one side of the side wall of the steel pad (10). Each guide ring (22) is slidably connected to its adjacent steel cable (12), and one end of each guide ring (22) is engaged with its adjacent fixing hole (11).

6. The prestressing anchor for bridge construction according to claim 5, characterized in that Each guide ring (22) has multiple pairs of guide plates (23) uniformly arranged in a ring shape on its inner bottom surface, and each pair of guide plates (23) is slidably connected to its adjacent tightening groove (21).

7. The prestressing anchor for bridge construction according to claim 6, characterized in that Each pair of guide plates (23) is connected to an elastic folding plate (24) at one end near the fastening ring (20).

8. The pre-stressing anchorage device for bridge construction as claimed in claim 6 wherein, Multiple elastic baffles (24) are connected between the multiple guide rings (22), and multiple connecting holes (25) are provided on the side wall of each elastic baffle (24).

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