A long-span slow-bonding prestressed reinforced concrete structural beam

Abstract

The invention discloses a long-span slow-bonding prestressed reinforced concrete structure beam, which is a slow-bonding prestressed concrete structure, including a long-span slow-bonding prestressed beam and a prestressed steel bar auxiliary positioning device, the long-span slow-bonding prestressed beam includes a frame beam and a frame column, the frame beam is interspersed with slow-bonding prestressed steel bars, the slow-bonding prestressed steel bars include steel strands, slow-bonding adhesives and PE sheaths, the frame beam is provided with beam steel bars that bear force, the beam steel bars include longitudinal bars and stirrups, the longitudinal bars and stirrups are connected to form a steel cage of the frame beam, and the prestressed steel bar auxiliary positioning device is fixed below the longitudinal bars, and is used to adjust the distance between the slow-bonding prestressed steel bars and the upper end face or the lower end face of the frame beam. The invention provides a reliable design scheme for the majority of design and construction practitioners by providing the design parameters, design structure and related material property selection required for the slow-bonding prestressed steel bar long-span beam with a length of 21 to 24 meters.

Description

Technical Field

[0001] The invention relates to the technical field of frame beam design, and in particular to a large-span slow-bonding prestressed reinforced concrete structural beam. Background Art

[0002] According to the "Seismic Design Code" (hereinafter referred to as the Code), a long-span frame refers to a frame with a span of not less than 18 meters, which involves the frame beams and frame columns that make up the frame. The frame beams used in the long-span frame can also be called long-span beams. The design requirements for long-span beams of different lengths are also different, whether in terms of structural design, material selection, or construction methods, and cannot be generalized.

[0003] There are many design schemes for long-span beams, such as the "Large-diameter slow-bonding prestressed steel bar structure" disclosed in Chinese patent documents, with publication number CN216584351U and authorization announcement date of May 24, 2022. The patent discloses a slow-bonding prestressed steel bar inserted into the frame beam to offset the positive bending moment of the frame beam during use, avoid cracks in the frame structure, and improve the stability of the overall structure. However, the patent document does not specify the length of the beam matched by the data it displays, so the technical means in the document are not applicable to long-span beams of different lengths.

[0004] As we all know, the calculation of structural design, material selection and construction methods for long-span beams not only needs to meet relevant standards, but also involves a lot of engineering experience and the selection of algorithm core parameters, which are often kept as trade secrets and not disclosed. According to the investigation and search, in the current existing technology, the design parameters and design structure required for long-span beams with slow-bonded prestressed steel bars with a length of 21 to 24 meters have not been disclosed.

[0005] At the same time, due to the characteristics of large span, the arrangement of slow-bonding prestressed steel bars in the beam should avoid tying dense steel bars and control the height of key positions, so it is inevitable that there will be twists and turns. At this time, a device is needed that can accurately position the prestressed steel bars in the slow-bonding prestressed beam.

[0006] For example, the "Large-span slow-bonding prestressed reinforced concrete beam and construction method" disclosed in the Chinese patent literature has a publication number of CN112832512B and an authorization announcement date of May 27, 2022. It also discloses a large-span beam structure using slow-bonding prestressed steel bars as the basis. The document discloses a structure for positioning prestressed steel bars, but the structure uses steel wire to tie the slow-bonding prestressed steel bars. When the prestressed steel bars need to be adjusted during construction, the steel wire needs to be removed and re-tied, which is time-consuming and labor-intensive. After the prestressed steel bars are laid, the slow-bonding prestressed steel bars need to be moved when adjusting the length and height. The external pipe sleeve is tied with steel wire and cannot be moved. If it is moved forcibly, it may even damage the pipe sleeve.

[0007] Therefore, in the structural design of the long-span beam with slow-bonding prestressed steel bars, it is also necessary to design an auxiliary structure that can accurately position the slow-bonding prestressed steel bars to facilitate the positioning and adjustment of the prestressed steel bars. Summary of the invention

[0008] The purpose of the present invention is to provide a large-span slow-bonding prestressed reinforced concrete structural beam, which is specifically used to solve the design structure problem of the 21-24 meter slow-bonding prestressed steel bar large-span beam proposed in the background technology, and at the same time provide an auxiliary structure that can accurately position the slow-bonding prestressed steel bars, so as to realize the design structure of the slow-bonding prestressed steel bar large-span beam.

[0009] The technical solution of the present invention is achieved in this way:

[0010] A long-span slow-bonding prestressed reinforced concrete structural beam is a slow-bonding prestressed concrete structure, comprising a long-span slow-bonding prestressed beam and a prestressed steel bar auxiliary positioning device, the long-span slow-bonding prestressed beam comprising a frame beam and a frame column, the frame beam is interspersed with slow-bonding prestressed steel bars, the slow-bonding prestressed steel bars comprise steel strands, slow-bonding adhesives and PE sheaths, the frame beam is provided with beam steel bars for bearing force, the beam steel bars comprise longitudinal bars and stirrups, the longitudinal bars and stirrups are connected to form a steel cage of the frame beam, the prestressed steel bar auxiliary positioning device is fixedly installed below the longitudinal bars, and is used to adjust the distance between the slow-bonding prestressed steel bars and the upper end face or the lower end face of the frame beam, the slow-bonding prestressed steel bars extend from both ends of the frame beam, and tensioning end portions are respectively provided in the side walls at both ends of the frame beam and anchorage end, the steel strand is a high-strength, low-relaxation steel strand with a diameter of not less than 21.8 mm, the ultimate strength standard value fptk of the steel strand is not less than 1860 MPa, the tensile strength design value fpy is not less than 1320 MPa, the compressive strength design value f'py is not less than 390 MPa, the maximum force total elongation is not less than 3.5%, the weight of the slow-bonding prestressed steel bar is 2.9-3.0 kg per meter, the rib height of the slow-bonding prestressed steel bar is not less than 2.0 mm, the rib groove depth is not less than 1.8 mm, the standard tension application period of the slow-bonding adhesive is not less than 120 days, the standard curing time is not higher than 360 days, the slow-bonding prestressed steel bar is arranged in a quadratic parabola shape, and the distance L1 between the two frame columns is 21000-24000 mm;

[0011] The length L2 of the frame beam extending outside the frame column is 5000mm~6000mm;

[0012] The height H1 of the frame beam between the two frame columns is 1780~1820mm;

[0013] The height H2 of the frame beam extending outside the frame column is 1080~1120mm;

[0014] The vertical distance H3 from the slow-bonded prestressed steel bars at the tensioning end and the anchoring end to the upper end surface of the frame beam is 280~320mm;

[0015] The vertical distance H4 from the slow-bonded prestressed steel bar directly above the center of the frame column to the upper end face of the frame beam is 130~170mm;

[0016] The vertical distance H5 from the slow-bonded prestressed steel bar at the midpoint of the length of the frame beam extending outside the frame column to the upper end surface of the frame beam is 230~270mm;

[0017] The vertical distance H6 from the lowest point of the slow-bonded prestressed steel bars between the two frame columns to the lower end surface of the frame beam is 130~170mm.

[0018] A further technical solution is that the tensioning end includes a first pressure plate, indirect steel bars, a hole mold and a clip-type single-hole anchor, the first pressure plate is arranged in the frame beam, the indirect steel bars are installed on the inner side of the first pressure plate, a columnar hole mold is provided on the side wall of the frame beam outside the first pressure plate, a clip-type single-hole anchor is installed on the first pressure plate, the clip-type single-hole anchor includes an anchor ring and a clip, the anchor ring is recessed in the frame beam through the hole mold, the slow-bonding prestressed steel bars pass through the rib holes in the anchor ring and clips are provided in the rib holes of the anchor ring.

[0019] A further technical solution is that the anchoring end includes a second pressure plate, indirect steel bars and an extruded anchor, the second pressure plate is arranged in the frame beam, the inner side of the second pressure plate is installed with indirect steel bars, the outer side of the second pressure plate is installed with an extruded anchor, the slow-bonding prestressed steel bars are clamped by the extruded anchor, and sealing measures are adopted at the ends of the slow-bonding prestressed steel bars at the anchoring end.

[0020] A further technical solution is that the efficiency coefficient of the clip-type single-hole anchor and the extrusion-type anchor is not less than 0.95.

[0021] A further technical solution is that the concrete strength grade of the concrete used for casting the frame beams and frame columns is not less than C40, and the total chloride ion content in the concrete of the frame beams is not more than 0.06% as a percentage of the total amount of gel material.

[0022] A further technical solution is that the prestressed steel bar auxiliary positioning device includes two fixed plates and an extension plate fixedly mounted under each fixed plate, a first rotating shaft is also arranged between the two extension plates, a plurality of insertion holes are arranged on the fixed plate, the fixed plate is arranged under the longitudinal reinforcement at the top of the beam reinforcement, the steel wire passes through the insertion hole to bind the fixed plate to the longitudinal reinforcement, a first sleeve is also sleeved on the first rotating shaft, the first sleeve rotates and slides on the first rotating shaft, at least one first threaded hole is arranged on the first sleeve, a first bolt is screwed in the first threaded hole, the first bolt presses against the first rotating shaft after being tightened, a second sleeve is also arranged on the first sleeve, and the second sleeve The first sleeve is fixedly mounted on the side wall of the first sleeve, and a second rotating shaft is rotatably and slidably inserted in the second sleeve. The second sleeve is provided with at least one second threaded hole, and a second bolt is screwed in the second threaded hole. After the second bolt is tightened, it presses against the second rotating shaft. A third sleeve is also provided at the end of the second rotating shaft, and the side wall of the third sleeve is vertically fixed to the end of the second rotating shaft. A sliding rod is also slidably inserted in the third sleeve, and at least one third threaded hole is provided on the third sleeve. A third bolt is screwed in the third threaded hole. After the third bolt is tightened, it presses against the sliding rod. The sliding rod is also provided with an external thread and a sliding clamping mechanism, and the sliding clamping mechanism is screwed on the external thread of the sliding rod.

[0023] A further technical solution is that the sliding clamping mechanism includes a bracket and a sliding clamp rotatably mounted on the bracket.

[0024] A further technical solution is that the bracket includes a fourth sleeve and a support plate, the inner wall of the fourth sleeve is provided with an internal thread, the fourth sleeve is screwed to the external thread of the sliding rod through the internal thread, there are two support plates, which are respectively fixed at the two ends of the side wall of the fourth sleeve, and the two support plates are provided with circular holes that penetrate the two support plates at the same time, and the sliding clamp is rotatably installed in the circular holes.

[0025] A further technical solution is that the sliding clamp includes a clamp cage and a roller, the clamp cage includes a rectangular top plate and a bottom plate, upper convex blocks are respectively provided below the left and right ends of the top plate, at least three equidistantly spaced circular shafts are provided between the two upper convex blocks, lower convex blocks are respectively provided above the left and right ends of the bottom plate, at least three equidistantly spaced circular shafts are provided between the two lower convex blocks, the upper convex block at the left end of the top plate and the lower convex block at the left end of the bottom plate are fixedly connected by at least three equidistantly spaced circular shafts, and the upper convex block at the right end of the top plate is also provided with at least three Through holes are evenly spaced, and a corresponding threaded shaft hole is provided at the position of the lower protrusion at the right end of the bottom plate relative to the through hole. A shaft rod is also passed through the through hole and the threaded shaft hole at the same time, and the lower end of the shaft rod is provided with an external thread. The shaft rod rotates through the through hole and is screwed into the threaded shaft hole below. The roller is rotatably sleeved outside the round shaft, and the roller is rotatably sleeved outside the shaft rod between the upper protrusion and the lower protrusion. An upper rotating shaft is also provided on the top surface of the top plate, and a limit block is also provided on the top of the upper rotating shaft. A lower rotating shaft is also provided on the bottom surface of the bottom plate, and a limit block is also provided on the bottom of the lower rotating shaft. The sliding clamp is rotatably installed in the circular hole of the support plate through the upper rotating shaft and the lower rotating shaft.

[0026] The beneficial effects of the present invention are:

[0027] By providing the design parameters, design structure and related material property selection required for long-span beams with slow-bonded prestressed steel bars with a length of 21 to 24 meters, a reliable design solution is provided for the majority of design and construction practitioners.

[0028] By setting up an auxiliary positioning device for prestressed steel bars, more accurate positioning and convenient adjustment can be achieved when laying slow-bonding prestressed steel bars, making the design structure of large-span slow-bonding prestressed steel reinforced concrete structural beams easier to achieve.

[0029] By providing the first sleeve, the second sleeve, the third sleeve and the fourth sleeve which can realize multi-dimensional adjustment in combination, the installation precision required for installing the auxiliary positioning device for prestressed steel bars is reduced, the fault tolerance rate is higher and the construction speed is faster.

[0030] By setting up the sliding clamping mechanism, the prestressed steel bar auxiliary positioning device can more easily capture the prestressed steel bar, and can effectively prevent the PE sheath from being damaged when adjusting the prestressed steel bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1This is a schematic diagram of the arrangement of slow-bonded prestressed steel bars in the frame beam;

[0032] Figure 2 The cross-sectional view of the internal structure of the prestressed steel bar for slow bonding;

[0033] Figure 3 It is the structural schematic diagram of the tensioning end;

[0034] Figure 4 is a structural schematic diagram of the anchoring end;

[0035] Figure 5 It is a three-dimensional local structural diagram of the assembly of the auxiliary positioning device of the prestressed steel bar and the beam steel bar;

[0036] Figure 6 It is the overall structural diagram of the assembly plane of the auxiliary positioning device for prestressed steel bars and beam steel bars;

[0037] Figure 7 The three-dimensional structure diagram of the place;

[0038] Figure 8 This is a schematic diagram of disassembling the parts of the auxiliary positioning device for prestressed steel bars;

[0039] Fig. 9 It is a three-dimensional structural diagram of the sliding clamping mechanism;

[0040] Fig.10 is a front view of the sliding clamping mechanism;

[0041] Fig.11 It is an exploded schematic diagram of the bracket and the clamp cage;

[0042] Fig.12 Schematic diagram of the disassembled clamp cage after removing the roller.

[0043] In the figure, 1, frame column, 2, frame beam, 3, prestressed steel bar, 4, steel strand, 5, slow-bonding adhesive, 6, PE sheath, 7, hole mold, 8, anchor ring, 9, first pressure plate, 10, indirect steel bar, 11, extruded anchor, 12, second pressure plate, 13, stirrups, 14, longitudinal reinforcement, 15, auxiliary positioning device, 16, fixing plate, 17, socket, 18, extension plate, 19, first rotating shaft, 20, first threaded hole, 21, first bolt, 22, first sleeve, 23, second sleeve, 24, first Two bolts, 25. Second threaded hole, 26. Second rotating shaft, 27. Third sleeve, 28. Third threaded hole, 29. Third bolt, 30. Slide rod, 31. Sliding clamping mechanism, 32. Fourth sleeve, 33. Support plate, 34. Reinforcing rib, 35. Sliding clamp, 36. Round hole, 37. Top plate, 38. Limit block, 39. Upper rotating shaft, 40. Upper protrusion, 41. Bottom plate, 42. Lower rotating shaft, 43. Roller, 44. Lower protrusion, 45. Round shaft, 46. Through hole, 47. Threaded shaft hole, 48. Shaft. DETAILED DESCRIPTION

[0044] In order to better understand the technical content of the present invention, specific embodiments are provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0045] See also Figures 1 to 12 A large-span slow-bonding prestressed reinforced concrete structural beam is a slow-bonding prestressed concrete structure, including a large-span slow-bonding prestressed beam and a prestressed steel auxiliary positioning device 15. The large-span slow-bonding prestressed beam includes a frame beam 2 and a frame column 1. The frame beam 2 is arranged above the frame column 1. The frame beam 2 is interspersed with slow-bonding prestressed steel bars 3. The frame beam 2 and the frame column 1 are also respectively provided with beam steel bars and column steel bars that bear force. The structure of the column steel bars and the beam steel bars is relatively common. There is no improvement in the present invention. The column steel bar structure is not described in detail here. For the convenience of subsequent scheme description, the components of the beam steel bars are simply described. The beam steel bars include longitudinal bars 14 and stirrups 13. The longitudinal bars 14 and stirrups 13 are connected to form a steel cage of the frame beam 2.

[0046] Specifically, the slow-bonding prestressed steel bar 3 is composed of a steel strand 4, a slow-bonding adhesive 5, and a PE sheath 6. The surface of the PE sheath 6 has uneven indentations. The diameter of the steel strand 4 is a high-strength, low-relaxation steel strand 4 of 21.8 mm (the definition of high-strength, low-relaxation refers to "High-strength, low-relaxation prestressed hot-dip galvanized steel strand 4 (YB / T 152-1999)"). The ultimate strength standard value of the steel strand 4 is fptk=1860MPa, the tensile strength design value is fpy=1320MPa, the compressive strength design value is f'py=390MPa, the maximum force total elongation is not less than 3.5%, the weight of the slow-bonding prestressed steel bar 3 per meter is 2.9~3.0kg, the rib height of the slow-bonding prestressed steel bar 3 of 21.8mm specification shall not be less than 2.0mm, and the rib groove depth shall not be less than 1.8mm. The slow-bonding adhesive 5 in the rib needs to be filled fully, the standard tensioning applicable period of the slow-bonding adhesive 5 is not less than 120 days, the standard curing time is not more than 360 days, and the slow-bonding prestressed steel bars 3 are tensioned within the tensioning applicable period.

[0047] The slow-bonding prestressed steel bar 3 extends from both ends of the frame beam 2, and a tensioning end and an anchoring end are respectively provided in the side walls at both ends of the frame beam 2. A first pressure plate 9 is provided on the tensioning end of the slow-bonding prestressed steel bar 3, and the first pressure plate 9 is arranged in the frame beam 2. An indirect steel bar 10 is installed on the inner side of the first pressure plate 9 (the side facing the middle of the frame beam 2). A columnar cavity mold 7 is provided on the side wall of the frame beam 2 outside the first pressure plate 9. A clip-type single-hole anchor is installed on the first pressure plate 9. The clip-type single-hole anchor includes an anchor ring 8 and a clip. The anchor ring 8 is recessed into the frame beam 2 through the cavity mold 7. The slow-bonding prestressed steel bar 3 passes through the rib hole in the anchor ring 8 and a clip is provided in the rib hole of the anchor ring 8. A second pressure plate 12 is provided on the anchorage end of the slow-bonding prestressed steel bar 3, and the second pressure plate 12 is arranged in the frame beam 2. An indirect steel bar 10 is installed on the inner side of the second pressure plate 12, and an extrusion anchor 11 is installed on the outer side of the second pressure plate 12. The slow-bonding prestressed steel bar 3 is clamped by the extrusion anchor 11, and sealing measures are adopted at the end of the anchorage end of the slow-bonding prestressed steel bar 3.

[0048] Specifically, the anchor efficiency coefficient is not less than 0.95.

[0049] Specifically, the fatigue anchoring performance of the slow-bonded prestressed steel bar 3 anchor assembly should meet the following requirements: the upper limit of the test stress is 65% of the limit value fptk of the prestressed steel bar 3, the fatigue stress amplitude is not less than 80N / mm2, and the number of cycles is not less than 2 million times of the required fatigue performance test.

[0050] The slow-bonding prestressed steel bars 3 of the present invention are arranged in a quadratic parabola shape;

[0051] The distance L1 between two frame columns 1 is 21000~24000mm;

[0052] The length L2 of the frame beam 2 extending outside the frame column 1 is 5000mm~6000mm;

[0053] The height H1 of the frame beam 2 between the two frame columns 1 is 1780~1820mm;

[0054] The height H2 of the frame beam 2 extending outside the frame column 1 is 1080~1120mm;

[0055] The vertical distance H3 from the slow-bonding prestressed steel bar 3 at the tensioning end and the anchoring end to the upper end surface of the frame beam 2 is 280-320 mm;

[0056] The vertical distance H4 from the slow-bonding prestressed steel bar 3 directly above the center of the frame column 1 to the upper end surface of the frame beam 2 is 130-170 mm;

[0057] The vertical distance H5 from the slow-bonding prestressed steel bar 3 at the midpoint of the length of the frame beam 2 extending outside the frame column 1 to the upper end surface of the frame beam 2 is 230-270 mm;

[0058] The vertical distance H6 from the lowest point of the slow-bonding prestressed steel bar 3 between the two frame columns 1 (i.e. the lowest point of the parabola) to the lower end surface of the frame beam 2 is 130-170 mm;

[0059] The slow-bonding prestressed steel bar 3 can be tensioned only after the concrete strength reaches 80% of the design strength. The tension stress is 1395MPa, which is verified by measuring the elongation value. The force support system at the bottom of the frame beam 2 shall not be removed before tensioning. After tensioning, the excess length of the slow-bonding prestressed steel bar 3 is cut off, and the ends of the clips and the slow-bonding prestressed steel bar 3 are coated with anti-corrosion grease or epoxy resin, and finally sealed with micro-expanded fine stone concrete.

[0060] Specifically, the concrete used for casting the frame beam 2 and the frame column 1 has a concrete strength grade of not less than C40. Chloride salts shall not be added to the concrete of the slow-bond prestressed concrete member, and the total chloride ion content of each component material of the concrete or mortar including admixtures shall not exceed 0.06% as a percentage of the total amount of gel material.

[0061] The prestressed steel bar auxiliary positioning device 15 of the present invention comprises two fixing plates 16 and an extension plate 18 fixedly mounted below each fixing plate 16. A first rotating shaft 19 is welded between the two extension plates 18. The fixing plates 16 are provided with a plurality of insertion holes 17. The fixing plates 16 are arranged below the longitudinal reinforcement 14 at the top of the beam reinforcement. The steel wire passes through the insertion holes 17 to bind the fixing plates 16 to the longitudinal reinforcement 14. A first sleeve 22 is also sleeved on the first rotating shaft 19. The first sleeve 22 rotates and slides on the first rotating shaft 19. Two first threaded holes 20 are provided on the first sleeve 22. The first bolts 21 are screwed into the first threaded holes 20. By tightening the first bolts 21, the first bolts 21 press the first rotating shaft 19 to fix the first sleeve 22 on the first rotating shaft 19. The first sleeve 22 is also provided with a second sleeve 23 , which is vertically fixed and welded to the side wall of the first sleeve 22 . The extension plate 18 makes the first rotating shaft 19 away from the upper longitudinal rib 14 , providing the first sleeve 22 and the second sleeve 23 with the space required for rotation.

[0062] A second rotating shaft 26 is also inserted into the second sleeve 23. The second rotating shaft 26 is slidably and rotatably inserted into the second sleeve 23. Two second threaded holes 25 are provided on the second sleeve 23. Second bolts 24 are threaded in the second threaded holes 25. By tightening the second bolts 24, the second bolts 24 press the second rotating shaft 26 to fix the second rotating shaft 26 in the second sleeve 23.

[0063] A third sleeve 27 is also provided at the end of the second rotating shaft 26. The side wall of the third sleeve 27 is vertically fixed and welded to the end of the second rotating shaft 26. A sliding rod 30 is slidably inserted in the third sleeve 27. Two third threaded holes 28 are provided on the third sleeve 27. A third bolt 29 is screwed in the third threaded hole 28. By tightening the third bolt 29, the third bolt 29 presses the sliding rod 30 to fix the sliding rod 30 in the third sleeve 27.

[0064] The slide rod 30 is provided with an external thread and a sliding clamping mechanism 31 , and the sliding clamping mechanism 31 is screwed onto the external thread of the slide rod 30 .

[0065] The sliding clamping mechanism 31 includes a bracket and a sliding clamp 35 rotatably mounted on the bracket. The bracket includes a fourth sleeve 32 and a support plate 33. The inner wall of the fourth sleeve 32 is provided with an internal thread. The fourth sleeve 32 is screwed to the external thread of the slide rod 30 through the internal thread. There are two support plates 33, which are respectively welded at the two ends of the side wall of the fourth sleeve 32. Reinforcing ribs 34 are welded at the connection between the support plate 33 and the side wall of the fourth sleeve 32. A circular hole 36 that penetrates the two support plates 33 at the same time is opened on the two support plates 33, and the sliding clamp 35 is rotatably mounted in the circular hole 36.

[0066] The sliding clamp 35 includes a clamp cage and a roller 43. The clamp cage includes a rectangular top plate 37 and a bottom plate 41. Upper protrusions 40 are respectively provided below the left and right ends of the top plate 37, and a plurality of circular shafts 45 are arranged between the two upper protrusions 40 and are evenly spaced. Lower protrusions 44 are respectively provided above the left and right ends of the bottom plate 41, and a plurality of circular shafts 45 are arranged between the two lower protrusions 44 and are evenly spaced. The upper protrusion 40 at the left end of the top plate 37 and the lower protrusion 44 at the left end of the bottom plate 41 are welded and connected by the circular shafts 45 that are evenly spaced. The upper protrusion 40 at the right end of the top plate 37 is also provided with a plurality of through holes 46 that are evenly spaced. A threaded shaft hole 47 is provided at the position of the lower protrusion 44 at the right end of the bottom plate 41 relative to the through hole 46. A shaft rod 48 is simultaneously penetrated through the through hole 46 and the threaded shaft hole 47. The lower end of the shaft rod 48 is provided with an external thread. The shaft rod 48 is screwed into the threaded shaft hole 47 below after rotating through the through hole 46. The roller 43 is rotatably sleeved outside the circular shaft 45, and the roller 43 is rotatably sleeved outside the shaft 48 between the upper protrusion 40 and the lower protrusion 44. The top surface of the top plate 37 is provided with an upper rotating shaft 39, and the top of the upper rotating shaft 39 is provided with a stop block 38. The bottom surface of the bottom plate 41 is provided with a lower rotating shaft 42, and the bottom of the lower rotating shaft 42 is provided with a stop block 38. The sliding clamp 35 is rotatably installed in the circular hole 36 of the support plate 33 through the upper rotating shaft 39 and the lower rotating shaft 42.

[0067] When the auxiliary positioning device 15 for prestressed steel bars is used, the horizontal coordinates at which the prestressed steel bars 3 need to be fixed are taken as the standard, and the fixing plate 16 is bound near the horizontal coordinates, and then the position of the first sleeve 22 on the first rotating shaft 19 is adjusted by sliding to accurately determine the specific coordinate position. Since the fixing plate 16 will inevitably deviate during the binding process and cannot be absolutely level, it is necessary to rotate the first sleeve 22 so that the second sleeve 23 is in a horizontal state. After the first sleeve 22 is adjusted, the second rotating shaft 26 is rotated so that the third sleeve 27 is in a vertical state, and the sliding rod 30 in the third sleeve 27 can also be in a vertical state. Subsequently, the sliding clamp 35 is rotated on the sliding rod 30 to adjust the vertical height of the sliding clamp 35 on the sliding rod 30, so as to adjust the height at which the prestressed steel bars 3 need to be positioned, that is, the distance between the prestressed steel bars 3 and the upper end face or lower end face of the beam. Pull out the shaft 48 of the sliding clamp 35, open the clamp cage, insert the prestressed steel bar 3, screw in the shaft 48, close the clamp cage, and the positioning point of the prestressed steel bar 3 can be clamped and positioned. When the prestressed steel bar 3 needs to be adjusted, the prestressed steel bar 3 slides on the roller 43 of the clamp cage to avoid cutting the sheath during the sliding process. The rotation of the sliding clamp 35 on the slide bar 30 can change the front, back, left and right positions of the prestressed steel bar 3 when they are in the same horizontal position, and can change the trend of the prestressed steel bar 3 to avoid some areas with dense steel bars. The upper rotating shaft 39 and the lower rotating shaft 42 rotate in the circular hole 36 of the support plate 33, ensuring that no matter where the sliding clamp 35 rotates to, the prestressed steel bar 3 can pass through the clamp cage smoothly.

[0068] In summary, through the rotation and sliding function of the first sleeve 22 and the rotation function of the third sleeve 27, the slide bar 30 can always be set vertically, solving the problem that the fixing plate 16 is difficult to accurately position when it is bound to the longitudinal reinforcement 14. Through the sliding function of the slide bar 30 in the third sleeve 27 and the threaded rotation function of the slide clamp 35 on the slide bar 30, the problem of height positioning and fixing of the slide clamp 35 on the slide bar 30 is achieved, and the matching rotation function of the clamp cage on the support plate 33 enables the slide bar 30 to slightly deviate from the predetermined position, and also achieves the fixation of the prestressed steel bar 3.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A long-span slow-bonding prestressed reinforced concrete structural beam, which is a slow-bonding prestressed concrete structure, comprises a long-span slow-bonding prestressed beam and a prestressed steel bar auxiliary positioning device, the long-span slow-bonding prestressed beam comprises a frame beam and a frame column, slow-bonding prestressed steel bars are inserted in the frame beam, the slow-bonding prestressed steel bars comprise steel strands, slow-bonding adhesives and PE sheaths, beam steel bars for bearing force are arranged in the frame beam, the beam steel bars comprise longitudinal bars and stirrups, the longitudinal bars and stirrups are connected to form a steel cage of the frame beam, and the invention is characterized in that: The prestressed steel bar auxiliary positioning device is fixed under the longitudinal reinforcement and is used to adjust the distance between the slow-bonding prestressed steel bar and the upper end face or the lower end face of the frame beam. The slow-bonding prestressed steel bar extends from both ends of the frame beam, and a tensioning end and an anchoring end are respectively provided in the side walls at both ends of the frame beam. The diameter of the steel strand is not less than 21.8mm high-strength low-relaxation steel strand, the ultimate strength standard value fptk of the steel strand is not less than 1860MPa, the tensile strength design value fpy is not less than 1320MPa, and the compressive strength is not less than 1000MPa. The design value f'py is not less than 390MPa, the total elongation at maximum force is not less than 3.5%, the weight of the slow-bonding prestressed steel bar per meter is 2.9~3.0kg, the rib height of the slow-bonding prestressed steel bar is not less than 2.0mm, the rib groove depth is not less than 1.8mm, the standard tension application period of the slow-bonding adhesive is not less than 120 days, and the standard curing time is not more than 360 days. The slow-bonding prestressed steel bar is arranged in a quadratic parabola shape, and the distance L1 between the two frame columns is 21000~24000mm; The length L2 of the frame beam extending outside the frame column is 5000mm~6000mm; The height H1 of the frame beam between the two frame columns is 1780~1820mm; The height H2 of the frame beam extending outside the frame column is 1080~1120mm; The vertical distance H3 from the slow-bonded prestressed steel bars at the tensioning end and the anchoring end to the upper end surface of the frame beam is 280~320mm; The vertical distance H4 from the slow-bonded prestressed steel bar directly above the center of the frame column to the upper end face of the frame beam is 130~170mm; The vertical distance H5 from the slow-bonded prestressed steel bar at the midpoint of the length of the frame beam extending outside the frame column to the upper end surface of the frame beam is 230~270mm; The vertical distance H6 from the lowest point of the slow-bonding prestressed steel bars between the two frame columns to the lower end surface of the frame beam is 130~170mm; The tensioning end includes a first pressure plate, indirect steel bars, a hole mold and a clip-type single-hole anchor. The first pressure plate is arranged in the frame beam, the indirect steel bars are installed on the inner side of the first pressure plate, a columnar hole mold is arranged on the side wall of the frame beam outside the first pressure plate, and a clip-type single-hole anchor is installed on the first pressure plate. The clip-type single-hole anchor includes an anchor ring and a clip. The anchor ring is recessed into the frame beam through the hole mold, and the slow-bonding prestressed steel bar passes through the tendon hole in the anchor ring and a clip is arranged in the tendon hole of the anchor ring. The anchoring end includes a second pressure-bearing plate, indirect steel bars and an extruded anchor. The second pressure-bearing plate is arranged in the frame beam, the inner side of the second pressure-bearing plate is installed with indirect steel bars, the outer side of the second pressure-bearing plate is installed with an extruded anchor, the slow-bonding prestressed steel bars are clamped by the extruded anchor, and the slow-bonding prestressed steel bars are sealed at the ends of the anchoring end. The prestressed steel bar auxiliary positioning device includes two fixing plates and an extension plate fixedly mounted under each fixing plate, a first rotating shaft is also arranged between the two extension plates, a plurality of insertion holes are arranged on the fixing plate, the fixing plate is arranged under the longitudinal reinforcement at the top of the beam reinforcement, the steel wire passes through the insertion holes to bind the fixing plate to the longitudinal reinforcement, a first sleeve is also sleeved on the first rotating shaft, the first sleeve rotates and slides on the first rotating shaft, at least one first threaded hole is arranged on the first sleeve, a first bolt is screwed in the first threaded hole, the first bolt presses against the first rotating shaft after being tightened, a second sleeve is also arranged on the first sleeve, the second sleeve is fixedly mounted on the first On the side wall of the sleeve, a second rotating shaft is rotatably and slidably inserted in the second sleeve, and at least one second threaded hole is provided on the second sleeve, and a second bolt is screwed in the second threaded hole. After the second bolt is tightened, it presses against the second rotating shaft. A third sleeve is also provided at the end of the second rotating shaft, and the side wall of the third sleeve is vertically fixed to the end of the second rotating shaft. A sliding rod is also slidably inserted in the third sleeve, and at least one third threaded hole is provided on the third sleeve, and a third bolt is screwed in the third threaded hole. After the third bolt is tightened, it presses against the sliding rod. The sliding rod is also provided with an external thread and a sliding clamping mechanism, and the sliding clamping mechanism is screwed on the external thread of the sliding rod.

2. A long-span slow-bonding prestressed reinforced concrete structural beam according to claim 1, characterized in that: The efficiency coefficient of the clip-type single-hole anchor and the extrusion-type anchor is not less than 0.

95.

3. A long-span slow-bonding prestressed reinforced concrete structural beam according to claim 2, characterized in that: The concrete strength grade of the concrete used for casting frame beams and frame columns shall not be lower than C40, and the total chloride ion content in the concrete of the frame beams shall not be greater than 0.06% as a percentage of the total amount of gel material.

4. The large-span slow-bonding prestressed reinforced concrete structural beam according to claim 3 is characterized in that: The sliding clamping mechanism comprises a bracket and a sliding clamping member rotatably mounted on the bracket.

5. The large-span slow-bonding prestressed reinforced concrete structural beam according to claim 4, characterized in that: The bracket includes a fourth sleeve and a support plate. The inner wall of the fourth sleeve is provided with an internal thread. The fourth sleeve is screwed to the external thread of the sliding rod through the internal thread. There are two support plates, which are respectively fixed on the two ends of the side wall of the fourth sleeve. The two support plates are provided with circular holes that penetrate the two support plates at the same time, and the sliding clamp is rotatably installed in the circular holes.

6. A long-span slow-bonding prestressed reinforced concrete structural beam according to claim 5, characterized in that: The sliding clamp comprises a clamp cage and a roller, and the clamp cage comprises a rectangular top plate and a bottom plate, upper convex blocks are respectively provided below the left and right ends of the top plate, and at least three circular shafts equidistantly distributed are provided between the two upper convex blocks, lower convex blocks are respectively provided above the left and right ends of the bottom plate, and at least three circular shafts equidistantly distributed are provided between the two lower convex blocks, the upper convex block at the left end of the top plate and the lower convex block at the left end of the bottom plate are fixedly connected by at least three circular shafts equidistantly distributed, the upper convex block at the right end of the top plate is also provided with at least three through holes equidistantly distributed, and the lower convex block at the right end of the bottom plate is provided with a plurality of through holes equidistantly distributed. A corresponding threaded shaft hole is also opened at the position of the block relative to the through hole, and a shaft rod is also passed through the through hole and the threaded shaft hole. The lower end of the shaft rod is provided with an external thread. After the shaft rod rotates through the through hole from the top, it is screwed into the threaded shaft hole below. The roller rotation sleeve is arranged outside the round shaft. The roller rotation sleeve is arranged outside the shaft rod between the upper protrusion and the lower protrusion. An upper rotating shaft is also arranged on the top surface of the top plate, and a limit block is also arranged on the top of the upper rotating shaft. A lower rotating shaft is also arranged on the bottom surface of the bottom plate, and a limit block is also arranged on the bottom of the lower rotating shaft. The sliding clamp is rotatably installed in the circular hole of the support plate through the upper rotating shaft and the lower rotating shaft.

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