A prestressed anchor groove structure

Abstract

This invention discloses a prestressed anchor groove structure, comprising an anchor groove retaining steel plate, multiple inner anchor plates, multiple outer anchor plates, multiple inner anchor bolts, multiple outer anchor bolts, transverse reinforcing bars, longitudinal reinforcing bars, and outer rebar joints. The inner anchor plates are welded to the corners of the retaining steel plate. The inner anchor bolts connect the upper and lower layers of inner anchor plates. The outer anchor plates are welded along the outer perimeter of the retaining steel plate and distributed in two layers. The outer anchor bolts connect the upper and lower layers of outer anchor plates. The transverse and longitudinal reinforcing bars are stacked crosswise between the two layers of inner anchor plates to form a longitudinal and transverse reinforcing mesh. The outer rebar joints are shaped like a "door," with their closed ends fitted onto the outer anchor bolts. Compared with existing technologies, this invention optimizes and improves the beam reinforcement configuration, enhances the beam's pouring density, improves construction quality, and enhances the bearing capacity and crack resistance of the anchor groove area.

Description

Technical Field

[0001] This invention relates to prestressed construction technology for beam bridges, and particularly to a prestressed anchor groove structure. Background Technology

[0002] Prestressed concrete beam bridges are widely favored and applied in highway construction due to their numerous advantages, including mature technology, economic practicality, rapid construction, and structural durability. Compared with reinforced concrete structures, the use of prestressing significantly improves the structural load-bearing performance, crack resistance, and durability. However, in actual engineering projects, prestressed steel strands need to be threaded through dense ordinary steel reinforcement, inevitably leading to interference with the ordinary steel reinforcement. The common approach in engineering is to prioritize ensuring the position of the prestressed steel strands and then adjust the position of the ordinary steel reinforcement to avoid the steel strands, thus solving the interference problem. The result of this adjustment inevitably leads to uneven distribution of ordinary steel reinforcement and local breaks or missing reinforcement, especially in the prestressed anchorage area. If this problem occurs in the structural stress area, it will weaken its load-bearing capacity and crack resistance, which is detrimental to structural safety and durability. At the same time, uneven distribution of reinforcement can lead to uneven vibration during structural construction, incomplete compaction during pouring, and reduced construction quality.

[0003] CN113897876A discloses a precast sulfur mortar anchor groove block for the construction of anchor grooves in prestressed steel-concrete composite beams. This invention is applicable to prestressed steel-concrete composite beams, which can reduce construction difficulty and improve construction quality. CN209686244U discloses a method for sealing anchorages in pre-reserved holes in the top slab of box girders. This utility model can improve the on-site construction quality and the integrity of the construction structure, effectively solve the problems of joint seepage and low concrete density, and reduce the difficulty of concrete pouring construction.

[0004] Existing patents all offer advantages in improving construction quality, but none have addressed issues such as uneven reinforcement density, localized breaks or missing reinforcement, and localized structural weaknesses in the main beam anchorage area. Therefore, this patent proposes a novel prestressed anchorage structure. Summary of the Invention

[0005] The purpose of this invention is to provide a prestressed anchor groove structure, which is beneficial for optimizing and improving the reinforcement configuration of the beam, enhancing the compactness of the beam casting, improving construction quality, and improving the bearing capacity and crack resistance of the anchor groove area.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] A prestressed anchor groove structure includes an anchor groove retaining steel plate, multiple in-groove anchor plates, multiple out-groove anchor plates, multiple in-groove anchor bolts, multiple out-groove anchor bolts, transverse reinforcing bars, longitudinal reinforcing bars, and out-groove rebar joints. The retaining steel plate is rectangular. The multiple in-groove anchor plates are welded to the corners of the retaining steel plate and are distributed in two layers. The multiple in-groove anchor bolts connect the upper and lower layers of in-groove anchor plates. The multiple out-groove anchor plates are welded along the outer perimeter of the anchor groove retaining steel plate and are distributed in two layers. The multiple out-groove anchor bolts connect the upper and lower layers of out-groove anchor plates. The transverse and longitudinal reinforcing bars are stacked crosswise between the two layers of in-groove anchor plates to form a longitudinal and transverse reinforcing mesh. The in-groove rebar joints are "door" shaped, with their closed ends fitted onto the out-groove anchor bolts and their open ends pointing away from the anchor groove retaining steel plate.

[0008] In a preferred embodiment, the anchor plate in the groove is configured as an equilateral "L" shape with three anchor bolt holes, and the anchor bolts in the groove are configured corresponding to the anchor bolt holes.

[0009] In a preferred embodiment, a square chamfer is provided on the outer side of the intersection of the anchor plates in the groove, and an arc-shaped chamfer is provided on the inner side of the intersection.

[0010] In a preferred embodiment, the external anchor plate is rectangular.

[0011] In a preferred embodiment, the transverse and longitudinal reinforcing bars of the anchor groove are configured as rectangular closed loops.

[0012] In a preferred embodiment, the anchor groove retaining steel plate includes a body and a dismantling section disposed on the body.

[0013] In a preferred embodiment, the dismantling section is provided with a plurality of longitudinally arranged adjustment slots, the top of the adjustment slots is provided with a top opening, the adjustment slots are provided with a magnet block and an adjustment rod, the magnet block is provided with an adjustment through hole, the adjustment through hole is provided with an adjustment sleeve, the inner wall of the adjustment sleeve is provided with a first thread, the side wall of the adjustment rod is provided with a second thread, the first thread and the second thread are engaged, and the top of the adjustment rod passes through the top opening.

[0014] In a preferred embodiment, the bottom of the adjustment groove is provided with a bottom opening, and the bottom of the magnet block is provided with a positioning member. The positioning member includes a top frame and a plurality of anti-slip protrusions. The top frame is provided corresponding to the bottom opening, and the anti-slip protrusions are provided at the bottom of the top frame.

[0015] In a preferred embodiment, the top of the adjusting rod is provided with an internal hexagon countersunk hole.

[0016] Compared with the prior art, the present invention provides a prestressed anchor groove structure, which solves the problems of uneven reinforcement density, local rebar breakage and missing parts, and weak regional structure in the prestressed steel strand anchor groove area. It is beneficial to optimize and improve the reinforcement configuration of the beam, enhance the compactness of the beam casting, improve the construction quality, and improve the bearing capacity and crack resistance of the anchor groove area. Attached Figure Description

[0017] Figure 1 This is an elevation view of a prestressed anchor groove structure, which relates to the present invention.

[0018] Figure 2 This is a plan view of a prestressed anchor groove structure, which relates to the present invention.

[0019] Figure 3 This is a schematic diagram of the steel plate for the anchor buckle inside the prestressed anchor groove structure, which relates to the present invention.

[0020] Figure 4 This is a schematic diagram of the demolition section of a prestressed anchor groove structure, which relates to the present invention.

[0021] Figure 5 This invention relates to a schematic diagram of the longitudinal section of the adjustment groove of the demolition section of a prestressed anchor groove structure.

[0022] Figure 6 yes Figure 5 A magnified structural diagram of part A in the middle.

[0023] Figure 7 This is a schematic diagram of the first step in the construction process of a prestressed anchor groove structure, which relates to the present invention.

[0024] Figure 8 This is a schematic diagram of the second step in the construction process of a prestressed anchor groove structure, which is related to the present invention.

[0025] Figure 9 This is a schematic diagram of the third step in the construction process of a prestressed anchor groove structure, which relates to the present invention.

[0026] Figure 10 This is a schematic diagram of the fourth step in the construction process of a prestressed anchor groove structure, which relates to the present invention.

[0027] In the picture

[0028] 1. Anchor groove retaining steel plate; 2. Body; 3. Removal section; 4. Adjustment groove; 5. Top opening; 6. Bottom opening; 7. Magnet block; 8. Adjustment through hole; 9. Adjustment sleeve; 10. First thread; 11. Adjustment rod; 12. Second thread; 13. Top frame; 14. Anti-slip protrusion; 16. Hexagonal countersunk hole; 17. Anchor buckle steel plate inside the groove; 18. Square chamfer; 19. Arc chamfer; 20. Anchor buckle steel plate outside the groove; 21. Anchor bolt inside the groove; 22. Anchor bolt outside the groove; 23. Transverse ring reinforcement of the anchor groove; 24. Longitudinal ring reinforcement of the anchor groove; 25. Rebar joint outside the groove; 26. Tensioning jack; 27. Anchor plate; 28. Steel strand; 29. ​​Anchor; 30. Box girder top surface; 31. Shim; 32. Nut; 33. Beam reinforcement; 34. Roughening. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0031] like Figures 1 to 6 As shown, a prestressed anchor groove structure includes an anchor groove retaining steel plate 1, multiple in-groove anchor plates 17, multiple out-groove anchor plates 20, multiple in-groove anchor bolts 21, multiple out-groove anchor bolts 22, transverse anchor bars 23, longitudinal anchor bars 24, and out-groove rebar joints 25. The retaining steel plate is rectangular. The multiple in-groove anchor plates 17 are welded to the corners of the retaining steel plate and are distributed in two layers. The multiple in-groove anchor bolts 21 connect the upper and lower layers of the in-groove anchor plates 17. The multiple out-groove anchor plates 20... The anchor bolts 22 are welded along the outer perimeter of the anchor groove retaining steel plate 1 and are distributed in two layers. The multiple anchor bolts 22 outside the groove connect the upper and lower layers of the anchor bolt steel plate 20 outside the groove. The transverse ring bars 23 and the longitudinal ring bars 24 of the anchor groove are stacked crosswise between the two layers of anchor bolt steel plate 17 inside the groove to form a longitudinal and transverse steel mesh. The steel bar joint 25 outside the groove is set in the shape of a "door". Its closed end is sleeved on the anchor bolt 22 outside the groove, and its open end points away from the anchor groove retaining steel plate 1. It is connected to the beam steel bar by welding or sleeve.

[0032] This embodiment presents a prestressed anchor groove structure that solves problems such as uneven reinforcement density, localized rebar breaks and missing sections, and weak regional structure in the prestressed steel strand anchor groove area. This structure is beneficial for optimizing and improving the reinforcement configuration of the beam, enhancing the compactness of the beam casting, improving construction quality, and increasing the load-bearing capacity and crack resistance of the anchor groove area.

[0033] Furthermore, the dimensions of the anchor steel plate 17 in the trench are determined based on the longitudinal reinforcing bars, transverse reinforcing bars, and the diameter of the anchor bolts 21 in the trench. The thickness of the steel plate can be 10mm-20mm. The anchor steel plate 17 in the trench is welded to the anchor trench retaining steel plate 1, and welded vertically along the anchor trench retaining steel plate 1. There are 4 plates per layer, and the clear distance between layers is not less than the diameter of the reinforcing bars in the trench. The lower 4 steel plates are prefabricated and welded together with the anchor trench retaining steel plate 1, and the upper 4 steel plates are welded on site after the prestressing tensioning grouting, so as to facilitate the installation and placement of the reinforcing bar rings in the trench and ensure sufficient space for the prestressing steel strand tensioning.

[0034] Furthermore, the anchor plate 17 inside the groove is set as an equilateral "L" shape, with three anchor bolt holes on it. The diameter of the anchor bolt holes should not be less than the diameter of the anchor bolt 21 outside the groove, and the anchor bolt 21 inside the groove is set corresponding to the anchor bolt holes.

[0035] To facilitate welding with the anchor groove retaining steel plate 1 during installation, a square chamfer 18 is provided on the outer side of the intersection of the anchor buckle steel plate 17 in the groove, and an arc chamfer 19 is provided on the inner side of the intersection to ensure uniform stress when the steel plate transmits force.

[0036] Furthermore, the external anchor steel plate 20 is rectangular, with two anchor bolt holes on each external anchor steel plate 20. The diameter of the anchor bolt holes should not be less than the diameter of the anchor bolt 22. The dimensions of the external anchor steel plate 20 are determined based on the longitudinal and transverse reinforcement in the trench and the diameter of the external anchor bolt 22. The thickness of the external anchor steel plate 20 can be 10mm-20mm. The number of external anchor steel plates 20 in each layer is determined by the size of the anchor trench and the spacing of the beam reinforcement. The clear distance between layers is not less than the diameter of the beam reinforcement. The upper and lower layers of steel plates are prefabricated and welded together with the anchor trench retaining steel plate 1.

[0037] Furthermore, the transverse reinforcing bars 23 and the longitudinal reinforcing bars 24 of the anchor groove are set as rectangular closed loops, which are formed by connecting them with extrusion sleeves during manufacturing or are integrally molded into closed loops in the factory.

[0038] Furthermore, the in-slot anchor bolts 21 and the out-of-slot anchor bolts 22 are used to connect the anchor plates and reinforcing bars. High-strength bolts are used in the stress-bearing areas, while ordinary bolts can be used in general areas. After the anchor bolts pass through the pre-drilled anchor bolt holes in the upper and lower anchor plates, they are anchored to the anchor plates using nuts and washers.

[0039] Furthermore, the anchor groove retaining steel plate 1 is used to reserve prestressed anchor grooves when constructing box girders. This component consists of four steel plates, which are welded together to form a rectangular or trapezoidal frame. The dimensions of each steel plate are determined according to the anchor groove depth and side length required by the anchor model, and the thickness of the steel plate can be 10mm-20mm.

[0040] Furthermore, the anchor groove retaining steel plate 1 includes a body 2 and a dismantling section 3 provided on the body 2, and the dismantling section 3 is dismantled during the construction process.

[0041] To facilitate the removal of the dismantling section 3, the dismantling section 3 is provided with multiple longitudinally arranged adjustment grooves 4. Each adjustment groove 4 has a top opening 5. A magnet block 7 and an adjustment rod 11 are disposed within each adjustment groove 4. The magnet block 7 has an adjustment through hole 8, and an adjustment sleeve 9 is disposed within the adjustment through hole 8. The inner wall of the adjustment sleeve 9 has a first thread 10, and the side wall of the adjustment rod 11 has a second thread 12. The first thread 10 and the second thread 12 cooperate, and the top of the adjustment rod 11 protrudes through the top opening 5. With this structural configuration, the position of the magnet block 7 can be adjusted up and down by rotating the adjustment rod 11. When the magnet block 7 is positioned lower, the attraction to the body 2 is stronger, causing the dismantling section 3 to firmly adhere to the body 2. When the magnet block 7 is positioned higher, the attraction to the body 2 is weaker, resulting in a weaker adhesion between the dismantling section 3 and the body 2. Therefore, rotating the adjustment rod 11 can adjust the bonding strength between the dismantling section 3 and the body 2. Meanwhile, since multiple magnet blocks 7 are set for the adjustment slots 4, they are adjusted one by one. Compared with the method of setting a whole magnet, this adjustment method is much easier, and thus a larger magnet can be set to achieve a strong attraction between the dismantling section 3 and the main body 2, ensuring the stability of the structure.

[0042] To further enhance the bonding strength between the dismantling section 3 and the main body 2, the bottom of the adjusting groove 4 is provided with a bottom opening 6, and the bottom of the magnet block 7 is provided with a positioning component. The positioning component includes a support frame 13 and multiple anti-slip protrusions 14. The support frame 13 is positioned corresponding to the bottom opening 6, and the anti-slip protrusions 14 are located at the bottom of the support frame 13. When the magnet block 7 is adjusted to the low position, the anti-slip protrusions 14 abut against the upper surface of the main body 2, achieving a good anti-slip effect.

[0043] To facilitate the rotation of the adjusting rod 11, the top of the adjusting rod 11 is provided with an internal hexagon countersunk hole 16.

[0044] The construction process of a prestressed anchor groove structure according to this embodiment is described below:

[0045] like Figure 7 As shown, the first step is as follows: 1. Prefabricate the anchor groove retaining steel plate 1 and anchor buckle steel plate unit (excluding the upper steel plate of the anchor buckle), anchor groove transverse ring reinforcement 23, anchor groove longitudinal ring reinforcement 24 and external reinforcement joint 25; 2. Install the anchor groove retaining steel plate 1 and anchor buckle steel plate, and pre-embed the anchor groove anchor bolts; 3. Install the external reinforcement joint 25, install the external anchor bolts 22 and tighten their corresponding nuts 32; 4. Pour the concrete of the external main beam; 5. Tension the prestressed steel strands 28 and grout.

[0046] like Figure 8As shown, the second step is to lower and install the anchor groove transverse ring bars 23 and anchor groove longitudinal ring bars 24 in a bottom-up order. The vertical positions of the ring bars 23 and 24 should be consistent with the vertical positions of the main beam transverse and longitudinal reinforcement bars, respectively.

[0047] like Figure 9 As shown, the third step is: 1. Remove the removal section 3 of the anchor groove retaining steel plate 1, roughen the surrounding concrete 34, weld the anchor buckle steel plate in the groove to the body 2 of the anchor groove retaining steel plate 1, and tighten the nuts 32 of the pre-embedded anchor bolts in the groove.

[0048] like Figure 10 As shown, concrete is poured into the anchor groove.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising..." or "including..." does not exclude the presence of additional elements in the process, method, article, or terminal device that includes said element. Additionally, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number.

[0050] The above description of the embodiments is provided to facilitate understanding and use of the present invention by those skilled in the art. It is obvious to those skilled in the art that various modifications can be easily made to the embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A prestressed anchor groove structure, characterized in that, The system includes an anchor trench enclosure steel plate, multiple in-sand trench anchor plates, multiple out-sand trench anchor plates, multiple in-sand trench anchor bolts, multiple out-sand trench anchor bolts, transverse reinforcing bars, longitudinal reinforcing bars, and out-sand trench rebar joints. The enclosure steel plate is rectangular. The multiple in-sand trench anchor plates are welded to the corners of the enclosure steel plate and are distributed in two layers. The multiple in-sand trench anchor bolts connect the upper and lower layers of the in-sand trench anchor plates. The multiple out-sand trench anchor plates are welded along the outer perimeter of the anchor trench enclosure steel plate and are distributed in two layers. The multiple out-sand trench anchor bolts connect the upper and lower layers of the out-sand trench anchor plates. The transverse and longitudinal reinforcing bars are stacked crosswise between the two layers of in-sand trench anchor plates to form a longitudinal and transverse reinforcing mesh. The out-sand trench rebar joints are "door" shaped, with their closed ends fitted onto the out-sand trench anchor bolts and their open ends pointing away from the anchor trench enclosure steel plate.

2. The prestressed anchor groove structure according to claim 1, characterized in that, The anchor plate inside the groove is set as an equilateral "L" shape, with three anchor bolt holes on it, and the anchor bolts inside the groove are set in the corresponding anchor bolt holes.

3. The prestressed anchor groove structure according to claim 1, characterized in that, The outer side of the intersection of the anchor plates in the groove is provided with a square chamfer, and the inner side of the intersection is provided with an arc chamfer.

4. The prestressed anchor groove structure according to claim 1, characterized in that, The external anchor plate is rectangular.

5. The prestressed anchor groove structure according to claim 1, characterized in that, The transverse and longitudinal reinforcing bars of the anchor groove are configured as rectangular closed loops.

6. The prestressed anchor groove structure according to claim 1, characterized in that, The anchor groove retaining steel plate includes a main body and a dismantling section provided on the main body.

7. The prestressed anchor groove structure according to claim 6, characterized in that, The dismantling section is provided with multiple longitudinally arranged adjustment slots. The top of each adjustment slot has a top opening. A magnet block and an adjustment rod are provided in each adjustment slot. An adjustment through hole is provided on the magnet block. An adjustment sleeve is provided in the adjustment through hole. A first thread is provided on the inner wall of the adjustment sleeve. A second thread is provided on the side wall of the adjustment rod. The first thread and the second thread cooperate with each other. The top of the adjustment rod protrudes through the top opening.

8. The prestressed anchor groove structure according to claim 7, characterized in that, The bottom of the adjustment groove is provided with a bottom opening, and the bottom of the magnet block is provided with a positioning component. The positioning component includes a top support frame and multiple anti-slip protrusions. The top support frame is provided corresponding to the bottom opening, and the anti-slip protrusions are provided at the bottom of the top support frame.

9. The prestressed anchor groove structure according to claim 7, characterized in that, The top of the adjusting rod is provided with an internal hexagon countersunk hole.

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