Prestressed tensioning system and construction method thereof

Abstract

The application relates to a prestress tension system and a construction method thereof, and relates to the technical field of a prefabricated beam tension pedestal. The system comprises a base and end crossbeams. Two end crossbeams are symmetrically and fixedly installed on the base. A plurality of steel strands are arranged. The two ends of the steel strands are respectively arranged on the two end crossbeams. A plurality of groups of embedded parts are symmetrically embedded on the two end crossbeams. The steel strands are arranged in the embedded parts. A stress diffusion part comprises a stress plate. A plurality of stress holes are arranged on the stress plate. The steel strands are correspondingly arranged in the stress holes. A plurality of reinforcing plates are arranged. The reinforcing plates are fixedly installed on the stress plate. The reinforcing plates are connected with the embedded parts. A bottom plate is fixedly installed at the bottom of the stress plate. The bottom plate is fixedly connected with the reinforcing plates. The prestress steel strands can reduce the local stress generated on the end crossbeams, and the prestress steel strands can avoid damaging the end crossbeams.

Description

Technical Field

[0001] This application relates to the technical field of precast beam tensioning platforms, and in particular to a prestressed tensioning system and its construction method. Background Technology

[0002] In the ultra-high-speed, low-vacuum pipeline maglev transportation system project, the tube beam adopts a nu-beam structure. The lower half of the tube beam is a prestressed concrete u-beam encased in steel plates, while the upper half is an n-shaped steel pipe with circumferential stiffening ribs. The steel structure between the upper and lower parts of the tube beam is welded together. The standard beam-pier center distance along the entire line exceeds 30 meters, the beam length exceeds 29 meters, the calculated span exceeds 27 meters, and the weight of a single tube beam section exceeds 660 tons. During construction, the prestressed concrete u-beam of the lower half of the tube beam requires prestressing using a large-tonnage, large-component prestressing method with over 100 prestressed steel strands.

[0003] When using the pre-tensioning method with large tonnage, large components, and over a hundred prestressed steel strands for prestressing tensioning, the prestressed steel strands will generate enormous tensile force. This enormous tensile force is concentrated on a very small contact area under the anchorage, which in turn generates extremely high local bearing stress. This stress far exceeds the local bearing strength of the concrete of the tensioning platform in existing technologies, which can lead to the concrete surface of the end beam of the tensioning platform being crushed, cracked, or even collapsed, thereby compromising the integrity of the anchorage point. Summary of the Invention

[0004] In order to reduce the local stress generated by the prestressed steel strands at the end beams and avoid damage to the prestressed steel strands at the end beams, this application provides a prestressed tensioning system and its construction method.

[0005] Firstly, this application provides a prestressed tensioning system, which adopts the following technical solution:

[0006] A prestressed tensioning system, comprising:

[0007] Base;

[0008] Two end beams are provided, and the two end beams are symmetrically and fixedly installed on the base.

[0009] The support column is provided in two symmetrical and fixedly installed on the base. The two ends of the support column are respectively fixedly connected to the two end beams.

[0010] The steel strands are provided in multiple ways, and each end of the steel strands is respectively threaded onto two end crossbeams;

[0011] Multiple sets of embedded parts are symmetrically embedded on the two end beams, and the steel strands are threaded through the embedded parts.

[0012] Stress diffuser, the stress diffuser comprising:

[0013] A stress plate, wherein several stress holes are formed on the stress plate, and the steel strands are threaded through the stress holes one by one;

[0014] A reinforcing plate, wherein multiple reinforcing plates are provided, the reinforcing plates are fixedly installed on the stress plate, and the reinforcing plates are connected to the embedded parts;

[0015] A base plate is fixedly installed at the bottom of the stress plate and is fixedly connected to the reinforcing plate.

[0016] Optionally, the embedded part includes:

[0017] Two embedded steel plates are provided, and the two embedded steel plates are symmetrically arranged on two sides of the end beam. The reinforcing plate and the bottom plate are fixedly connected to the embedded steel plates.

[0018] The pre-embedded steel pipe is inserted and fixedly installed on two pre-embedded steel plates, and the steel strands are inserted one-to-one in the pre-embedded steel pipe.

[0019] Optionally, the embedded part, the stress plate, and the base plate together form a feeding cavity;

[0020] The feed chamber is filled with concrete.

[0021] Optionally, the reinforcing plate has a side hole, and a transverse steel bar is inserted through the side hole, and the transverse steel bar is fixedly connected to the reinforcing plate.

[0022] Optionally, it may also include a positioning bracket, the positioning bracket comprising:

[0023] The positioning posts are provided in two symmetrical and fixedly installed on the base.

[0024] A horizontal connecting rod, the two ends of which are fixedly connected to the two positioning posts;

[0025] A positioning brace, one end of which is fixedly connected to the positioning column, and the other end of which is fixedly connected to the base;

[0026] An upper positioning component is provided on the positioning column, and the top of the pre-embedded steel plate is connected to the upper positioning component;

[0027] The lower positioning component is disposed on the positioning column, and the bottom of the pre-embedded steel plate is connected to the lower positioning component.

[0028] Optionally, the upper positioning element includes:

[0029] A first angle steel is fixedly installed on the positioning post, and a first positioning groove is provided on the first angle steel.

[0030] The first screw is inserted into the first positioning groove. The first screw is threaded with a first fixing nut and a second fixing nut. The first fixing nut abuts against the first angle steel and is used to fix the relative position of the first screw and the first angle steel.

[0031] The second angle steel has a second positioning groove, the first screw passes through the second positioning groove, the second fixing nut abuts against the second angle steel, the second fixing nut is used to fix the relative position of the first screw and the second angle steel, and the second angle steel abuts against the embedded steel plate.

[0032] Optionally, the lower positioning element includes:

[0033] A first vertical control plate is fixedly installed on the positioning column, and a third positioning groove is provided on the first vertical control plate.

[0034] The second screw passes through the third positioning groove. The second screw is threaded with a third fixing nut and a fourth fixing nut. The third fixing nut abuts against the first vertical control plate and is used to fix the relative position of the second screw and the first vertical control plate.

[0035] The second vertical control plate has a fourth positioning groove, the second screw passes through the fourth positioning groove, the fourth fixing nut abuts against the second vertical control plate, the fourth fixing nut is used to fix the relative position of the second screw and the second vertical control plate, and the second vertical control plate abuts against the embedded steel plate.

[0036] Optionally, the second angle steel and the second vertical control plate are both welded to the embedded steel plate.

[0037] Optionally, it also includes a quick-fastening component, which includes:

[0038] A fixed housing is connected to the positioning post;

[0039] A fixing plate is fixedly installed on the fixing housing, and a guide groove is provided on the fixing plate;

[0040] Two fixing rods are provided, which are symmetrically arranged and slidably installed on the fixed housing. The fixing rods abut against the positioning post.

[0041] A rotating rod, which passes through and is threadedly connected to the fixed housing;

[0042] An abutment block is slidably installed inside the fixed housing. The abutment block is frustoconical in shape. Both sides of the abutment block abut against the fixed rod, and the top of the abutment block is rotatably connected to the rotating rod.

[0043] A sliding plate, which is slidably mounted on the guide groove;

[0044] Two clamping blocks are provided, and the two clamping blocks are symmetrically and slidably mounted on the sliding plate;

[0045] The positioning screws are provided in two form, and the two positioning screws are rotatably mounted on the sliding plate. The two clamping blocks are correspondingly sleeved and threadedly connected to the two positioning screws.

[0046] Secondly, this application provides a construction method for a prestressed tensioning system, employing the following technical solution:

[0047] A construction method for a prestressed tensioning system, based on the prestressed tensioning system described above, includes the following steps:

[0048] The location and quantity of steel strands are determined according to the process requirements, and embedded parts are prefabricated according to the location and quantity of steel strands.

[0049] Install positioning brackets to fix the position of the embedded parts;

[0050] Cast the end crossbeam so that the embedded parts and positioning brackets are embedded in the end crossbeam;

[0051] Install the stress diffuser on the embedded part and pour concrete into the feed chamber;

[0052] Thread the steel strands and perform tensioning operations to bring the steel strands into a taut state;

[0053] The reinforcement cage of the pipe beam and the concrete pouring work are carried out on the foundation;

[0054] After the pipe beam is poured, the steel strands are released.

[0055] In summary, this application includes at least one of the following beneficial technical effects:

[0056] 1. After the steel strand tensioning is completed, the steel strand, stress diffuser and embedded parts are fixed relatively to ensure that the tension stress of the steel strand can be stably applied to the embedded parts through the stress diffuser, and then applied to the end beam through the embedded parts, thereby expanding the force application area of ​​the steel strand tension stress on the end beam, thereby reducing the local stress generated by the steel strand on the end beam and avoiding damage to the end beam caused by the steel strand tension stress;

[0057] 2. Before threading the steel strands, confirm the installation position of the stress diffuser and install the stress diffuser at the corresponding position. The stress diffuser is installed in two stages on site to improve the installation accuracy and flexibility.

[0058] 3. When installing the embedded steel plate, the top position of the embedded steel plate is positioned by the upper positioning component, and the bottom position of the embedded steel plate is positioned by the lower positioning component, so as to achieve precise pre-embedding of the embedded parts. Attached Figure Description

[0059] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0060] Figure 2 It is a structural schematic diagram used to show the embedded parts;

[0061] Figure 3 This is a structural schematic diagram used to illustrate a stress diffusion component;

[0062] Figure 4 This is a structural diagram used to illustrate the horizontal reinforcing bars;

[0063] Figure 5 This is a structural diagram used to demonstrate the positioning bracket;

[0064] Figure 6 This is a structural diagram used to show the upper and lower positioning components;

[0065] Figure 7 yes Figure 6 Enlarged view of point A;

[0066] Figure 8 This is a structural diagram used to demonstrate quick-fix components;

[0067] Figure 9 It is a sectional view used to show the internal structure of a fixed shell.

[0068] Explanation of reference numerals in the attached figures:

[0069] 1. Base; 11. End beam; 12. Supporting column; 13. Steel strand;

[0070] 2. Embedded parts; 21. Embedded steel plates; 22. Embedded steel pipes;

[0071] 3. Stress diffuser; 31. Stress plate; 311. Stress hole; 32. Reinforcing plate; 321. Side hole; 33. Base plate; 34. Feed chamber; 35. Transverse reinforcement;

[0072] 4. Positioning bracket; 41. Positioning column; 42. Horizontal connecting rod; 43. Positioning diagonal brace; 44. Upper positioning component; 441. First angle steel; 4411. First positioning groove; 442. First screw; 443. First fixing nut; 444. Second fixing nut; 445. Second angle steel; 4451. Second positioning groove; 45. Lower positioning component; 451. First vertical control plate; 4511. Third positioning groove; 452. Second screw; 453. Third fixing nut; 454. Fourth fixing nut; 455. Second vertical control plate; 4551. Fourth positioning groove;

[0073] 5. Quick-fixing component; 51. Fixed housing; 52. Fixed plate; 521. Guide groove; 53. Fixed rod; 54. Rotating rod; 55. Abutment block; 56. Sliding plate; 57. Clamping block; 58. Positioning screw. Detailed Implementation

[0074] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0075] This application discloses a prestressed tensioning system.

[0076] Reference Figure 1 and Figure 2 A prestressed tensioning system includes a base 1, an embedded part 2, and a stress diffuser 3.

[0077] Two end beams 11 are symmetrically and fixedly installed on the base 1. The end beams 11 are cast in concrete and set on the base 1. Multiple steel strands 13 are arranged between the two end beams 11, with both ends of the steel strands 13 passing through the two end beams 11 respectively. Specifically, the standard tensile strength of the steel strands 13 is not less than 1860MPa. In this embodiment, the steel strands 13 adopt the model 1x7-15.2-1860-GB / T5224-2014. Two supporting columns 12 are symmetrically and fixedly installed on the base 1. Both ends of the supporting columns 12 are fixedly connected to the two end beams 11 respectively. Multiple sets of embedded parts 2 are provided, and the multiple sets of embedded parts 2 are symmetrically embedded on the two end beams 11. The steel strands 13 are passed through the end beams 11 by passing through the embedded parts 2. Stress diffusion components 3 are installed on the embedded parts 2.

[0078] Before prestressing, stress diffuser 3 is installed on embedded part 2. Then, steel strand 13 is threaded through embedded part 2 and stress diffuser 3. Subsequently, anchoring clamps are installed at both ends of steel strand 13. The anchoring clamp at one end of steel strand 13 anchors steel strand 13 to one of the end beams 11, completing the pre-tensioning preparations. During prestressing, the other end of steel strand 13 is tensioned using a hydraulic jack to bring steel strand 13 into a taut state. After prestressing is completed, steel strand 13... The anchoring clamp at the other end anchors the steel strand 13 to the stress diffuser 3 on the other end beam 11, ensuring that the steel strand 13 remains taut. At this time, the tensile stress of the steel strand 13 is applied to the embedded part 2 through the stress diffuser 3, and then to the end beam 11 through the embedded part 2, expanding the area of ​​force application of the tensile stress of the steel strand 13 on the end beam 11. This reduces the local stress generated by the steel strand 13 on the end beam 11, preventing damage to the end beam 11 caused by the tensile stress of the steel strand 13. Specifically, the anchoring clamp and hydraulic jack are existing technologies and will not be described in detail here.

[0079] Specifically, each set of embedded parts 2 includes two embedded steel plates 21 and multiple embedded steel pipes 22.

[0080] Two embedded steel plates 21 are symmetrically arranged on two sides of an end beam 11. Each embedded steel pipe 22 is fixedly installed on the two embedded steel plates 21. During pre-embedding, the embedded steel plates 21 and embedded steel pipes 22 are cast together at the end beam 11, with both ends of the embedded steel pipes 22 extending beyond the outer side of the end beam 11. The number of embedded steel pipes 22 is the same as the number of steel strands 13, and the steel strands 13 are threaded one-to-one inside the embedded steel pipes 22. The axis of the embedded steel pipes 22 is perpendicular to the embedded steel plates 21 to ensure that the axes of each embedded steel pipe 22 are parallel to each other. Specifically, the inner diameter of the embedded steel pipe 22 is larger than the diameter of the steel strand 13, and the difference can range from 4 mm to 6 mm; the wall thickness of the embedded steel pipe 22 is 2 mm to 3 mm.

[0081] When threading the steel strands 13, both ends of the steel strands 13 are threaded into two coaxially arranged pre-embedded steel pipes 22 to ensure that the axes of each steel strand 13 after prestressing are parallel to each other. This ensures that the tension stress of the steel strands 13 applies evenly to the end beams 11 and the pipe beam, avoids damage to the end beams 11 caused by the tension stress of the steel strands 13, and improves the forming quality and strength of the pipe beam.

[0082] Reference Figure 3 and Figure 4 The stress diffusion component 3 includes a stress plate 31, a reinforcing plate 32, and a base plate 33.

[0083] Several stress holes 311 are provided on the stress plate 31. The stress holes 311 are coaxially arranged in a one-to-one correspondence with the pre-embedded steel pipe 22. The steel strand 13 is passed through the stress holes 311. Specifically, the diameter of the stress hole 311 is at least 1 mm larger than the outer diameter of the pre-embedded steel pipe 22.

[0084] Multiple reinforcing plates 32 are provided and are fixedly installed on the stress plate 31 by welding. Specifically, the reinforcing plates 32 and the stress plate 31 adopt a continuous equilateral fillet weld with a weld height of not less than 5 mm. The base plate 33 is fixedly installed on the bottom of the stress plate 31 and is fixedly connected to the reinforcing plates 32. Specifically, the base plate 33, the stress plate 31, and the reinforcing plates 32 are all fixedly connected by welding, and the weld height between the base plate 33, the stress plate 31, and the reinforcing plates 32 is not less than 5 mm. The reinforcing plates 32 and the base plate 33 are both welded to the embedded steel plate 21. The weld height between the reinforcing plates 32 and the embedded steel plate 21 is not less than 5 mm; the weld height between the base plate 33 and the embedded steel plate 21 is not less than 8 mm.

[0085] Before threading the steel strands 13, confirm the installation position of the stress diffuser 3 and install the stress diffuser 3 at the corresponding position. The stress diffuser 3 is installed on-site in a secondary manner to improve the installation accuracy and flexibility of the stress diffuser 3.

[0086] Furthermore, when welding the stress diffusion component 3, cooling measures or intermittent segmented welding must be adopted to avoid damage to the end beam 11 during welding, and to prevent the stress diffusion component 3 and the embedded steel plate 21 from undergoing thermal deformation, thereby improving the structural stability of the embedded component 2 and the stress diffusion component 3.

[0087] Furthermore, the embedded steel plate 21, stress plate 31, bottom plate 33, and reinforcing plate 32 together form a feeding cavity 34. The feeding cavity 34 is open at the top and sealed at the bottom to allow it to be filled with concrete. The concrete is C50 fine aggregate concrete. The concrete fills the feeding cavity 34 to support the stress plate 31, reinforcing plate 32, and bottom plate 33, thereby improving the structural stability between the stress diffuser 3 and the embedded part 2. This prevents the tension stress of the steel strand 13 from deforming the stress diffuser 3 and ensures that the tension stress of the steel strand 13 can be evenly diffused on the embedded steel plate 21.

[0088] Furthermore, a side hole 321 is provided on the reinforcing plate 32, and a transverse steel bar 35 is inserted through the side hole 321. The transverse steel bar 35 is fixedly connected to the reinforcing plate 32, and the axial direction of the transverse steel bar 35 is perpendicular to the axial direction of the steel strand 13. The transverse steel bar 35 is used to improve the structural strength and stability of the stress diffusion component 3.

[0089] Reference Figure 5 and Figure 6The prestressed tensioning system also includes multiple sets of positioning brackets 4, which are used to position the embedded steel plate 21. Each set of positioning brackets 4 includes a positioning column 41, a horizontal connecting rod 42, a positioning brace 43, an upper positioning component 44, and a lower positioning component 45.

[0090] Each group of positioning brackets 4 is equipped with two positioning columns 41. The two positioning columns 41 are symmetrical and fixedly installed on the base 1. The axis of the positioning column 41 is set perpendicular to the base 1. The two ends of the horizontal connecting rod 42 are fixedly connected to the two positioning columns 41, and the horizontal connecting rods 42 of adjacent groups of positioning brackets 4 are fixedly connected. The positioning columns 41 and the horizontal connecting rods 42 can both be made of No. 10 I-beams. One end of the positioning diagonal brace 43 is fixedly connected to the positioning column 41, and the other end of the positioning diagonal brace 43 is fixedly connected to the base 1 to improve the structural stability of the positioning column 41 and prevent the positioning column 41 from shaking and deforming.

[0091] The upper positioning component 44 is mounted on the positioning post 41, and the top of the embedded steel plate 21 is connected to the upper positioning component 44. The lower positioning component 45 is mounted on the positioning post 41, and the bottom of the embedded steel plate 21 is connected to the lower positioning component 45. The positioning function of the embedded part 2 is achieved through the cooperation of the upper positioning component 44 and the lower positioning component 45.

[0092] Before installing the embedded steel plate 21, the positioning columns 41 of multiple sets of positioning brackets 4 are symmetrically and fixedly installed on the base 1. The top position of the embedded steel plate 21 is calibrated by the upper positioning component 44, and the left and right ends of the embedded steel plate 21 are calibrated by the lower positioning component 45, so as to achieve the precise positioning function of the embedded component 2.

[0093] After the installation position of the embedded steel plate 21 is determined, the embedded steel plate 21 is welded to the upper positioning part 44 and the lower positioning part 45 to fix the installation position of the embedded steel plate 21 and prevent the position of the embedded steel plate 21 from shifting during the pouring of the end beam 11.

[0094] Reference Figure 6 and Figure 7 Furthermore, the upper positioning component 44 includes a first angle steel 441, a first screw 442, and a second angle steel 445.

[0095] A first angle steel 441 is fixedly installed on a positioning post 41. A first positioning groove 4411 is provided on the first angle steel 441. The guiding direction of the first positioning groove 4411 is perpendicular to the embedded steel plate 21. A first screw 442 passes through the first positioning groove 4411. A first fixing nut 443 and a second fixing nut 444 are threaded onto the first screw 442. Two of each of the first fixing nuts 443 and the second fixing nut 444 are provided. The first fixing nut 443 abuts against the first angle steel 441. The first fixing nut 443 is used to fix the first angle steel 441. The relative position of a screw 442 and a first angle steel 441 is defined. A second positioning groove 4451 is provided on a second angle steel 445. The guiding direction of the second positioning groove 4451 is parallel to that of the embedded steel plate 21. The first screw 442 passes through the second positioning groove 4451. A second fixing nut 444 abuts against the second angle steel 445. The second fixing nut 444 is used to fix the relative position of the first screw 442 and the second angle steel 445. The second angle steel 445 abuts against the embedded steel plate 21, and the top of the second angle steel 445 is flush with the top of the embedded steel plate 21.

[0096] When positioning the top of the embedded steel plate 21, first determine the height of the top of the embedded steel plate 21, and adjust the height of the second angle steel 445 so that the horizontal plane of the second angle steel 445 is level with the height of the top of the embedded steel plate 21, so that the horizontal plane of the second angle steel 445 can be used as a reference to position the top of the embedded steel plate 21.

[0097] Then, the position of the first screw 442 in the second positioning groove 4451 is adjusted horizontally to make the second angle steel 445 move horizontally, so as to ensure that the second angle steel 445 has sufficient length to abut against the embedded steel plate 21 and improve the positioning accuracy of the second angle steel 445 and the embedded steel plate 21.

[0098] Next, adjust the horizontal position of the first screw 442 in the first positioning groove 4411 so that the first screw 442 moves horizontally to ensure that after the embedded steel plate 21 abuts against the vertical surface of the second angle steel 445, the embedded steel plate 21 is located exactly on the outer side of the end beam 11.

[0099] Subsequently, rotate the first fixing nut 443 so that the two first fixing nuts 443 abut against the two sides of the horizontal plane of the first angle steel 441; rotate the second fixing nut 444 so that the two second fixing nuts 444 abut against the two sides of the horizontal plane of the second angle steel 445, thereby fixing the second angle steel 445.

[0100] Finally, the height of the second angle steel 445 of the multiple sets of positioning brackets 4 was measured and compared to ensure that the height of the second angle steel 445 of the multiple sets of positioning brackets 4 was consistent.

[0101] Reference Figure 6 and Figure 8Furthermore, the lower positioning component 45 includes a first vertical control plate 451, a second screw 452, and a second vertical control plate 455.

[0102] The first vertical control plate 451 is fixedly mounted on the positioning post 41. A third positioning groove 4511 is formed on the first vertical control plate 451. The second screw 452 passes through the third positioning groove 4511, which guides the second screw 452 horizontally. A third fixing nut 453 and a fourth fixing nut 454 are threaded onto the second screw 452. The third fixing nut 453 abuts against the first vertical control plate 451 and is used to fix the second screw 452. 2. The relative position of the second vertical control plate 455 with the first vertical control plate 451 is as follows: the second vertical control plate 455 has a fourth positioning groove 4551, the second screw 452 passes through the fourth positioning groove 4551, the fourth positioning groove 4551 can guide the second screw 452 in the vertical direction, the fourth fixing nut 454 abuts against the second vertical control plate 455, the fourth fixing nut 454 is used to fix the relative position of the second screw 452 and the second vertical control plate 455, and the second vertical control plate 455 abuts against the embedded steel plate 21.

[0103] When positioning the bottom of the embedded steel plate 21, first determine the bottom height of the embedded steel plate 21, adjust the relative position of the second screw 452 in the fourth positioning groove 4551, so that the second vertical control plate 455 slides relative to the second screw 452 to adjust the vertical height of the second vertical control plate 455, ensuring that the bottom wall of the second vertical control plate 455 is flush with the bottom wall of the embedded steel plate 21, thus achieving the positioning of the bottom height of the embedded steel plate 21. At the same time, the top height of the embedded steel plate 21 is checked to improve the accuracy of the height positioning of the embedded steel plate 21. Then, rotate the fourth fixing nut 454 so that the two fourth fixing nuts 454 abut against the two sides of the second vertical control plate 455 to ensure that the second vertical control plate 455 is fixedly connected to the second screw 452, and the vertical height of the second vertical control plate 455 is fixed.

[0104] Next, adjust the relative position of the second screw 452 in the third positioning groove 4511 to adjust the horizontal position of the second vertical control plate 455 so that the side wall of the second vertical control plate 455 can abut against the side wall of the embedded steel plate 21; then rotate the third fixing nut 453 so that the two third fixing nuts 453 abut against the two sides of the first vertical control plate 451 to ensure that the first vertical control plate 451 is fixedly connected to the second screw 452, and the horizontal position of the second vertical control plate 455 is fixed, thereby improving the alignment accuracy between the second vertical control plate 455 and the embedded steel plate 21.

[0105] After the positions of the positioning brackets 4 are all determined, the top of the embedded steel plate 21 is welded to the second angle steel 445, and the bottom of the embedded steel plate 21 is welded to the second vertical control plate 455, thus completing the positioning work of the embedded steel plate 21 and ensuring the accuracy of the position of the embedded steel plate 21 after the end beam 11 is poured.

[0106] Reference Figure 8 and Figure 9 The prestressed tensioning system also includes a quick-fixing component 5, which can be quickly removed from the positioning column 41 to fix the position of the second angle steel 445 and the second vertical control plate 455 respectively.

[0107] The quick-fixing component 5 includes a fixed housing 51, a fixed plate 52, a fixed rod 53, a rotating rod 54, an abutment block 55, a sliding plate 56, a clamping block 57, and a positioning screw 58.

[0108] The fixed housing 51 abuts against the positioning post 41. The fixed housing 51 is located between the two side plates of the positioning post 41. The fixed plate 52 is fixedly connected to the fixed housing 51. The fixed plate 52 is provided with a guide groove 521. The guide groove 521 is perpendicular to the pre-embedded steel plate 21. There are two fixed rods 53. The two fixed rods 53 are symmetrically inserted and slidably installed on the fixed housing 51. The fixed rods 53 abut against the positioning post 41. The rotating rod 54 is inserted and threadedly connected to the fixed housing 51.

[0109] The abutment block 55 is slidably disposed within the fixed housing 51. Specifically, a guide rod is fixedly installed within the fixed housing 51. The abutment block 55 is sleeved on and slidably mounted on the guide rod. The guide rod has a rectangular cross section to ensure that the abutment block 55 does not rotate with the rotating rod 54. The abutment block 55 is frustum shaped. Both sides of the abutment block 55 abut against the fixed rod 53, and the top of the abutment block 55 is rotatably connected to the rotating rod 54.

[0110] The sliding plate 56 is slidably mounted on the guide groove 521. There are two clamping blocks 57, which are symmetrical and slidably mounted on the sliding plate 56. There are two positioning screws 58, which are symmetrical and rotatably mounted on the sliding plate 56. The two clamping blocks 57 are respectively sleeved and threadedly connected to the two positioning screws 58.

[0111] After determining the height of the second angle steel 445, it is necessary to determine its horizontal position. Since fixing the horizontal position of the second angle steel 445 requires rotating the first fixing nut 443 and the second fixing nut 444, the rotation of the first fixing nut 443 and the second fixing nut 444 can easily cause the second angle steel 445 to rotate accordingly, causing the second angle steel 445 to shift, which in turn leads to inaccurate positioning of the second angle steel 445 with the embedded steel plate 21. Therefore, it is necessary to pre-fix the second angle steel 445 with the quick-fixing piece 5 after determining its height to avoid the second angle steel 445 shifting during subsequent adjustments.

[0112] When using the quick-fixing piece 5 to fix the second angle steel 445, first adjust the position of the fixing housing 51 so that the vertical surface of the second angle steel 445 is between the two clamping blocks 57; then rotate the rotating rod 54 to make the abutment block 55 slide inside the fixing housing 51. During the sliding process of the abutment block 55, the two fixing rods 53 are pushed away from each other, so that the fixing rods 53 abut against the positioning post 41 to ensure that the fixing housing 51 and the positioning post 41 are relatively fixed.

[0113] Then, rotate the two positioning screws 58 respectively to move the two clamping blocks 57 on the sliding plate 56 and clamp the second angle steel 445, pre-fixing the second angle steel 445 to prevent the second angle steel 445 from shifting during the rotation of the first fixing nut 443 and the second fixing nut 444, thereby improving the positioning accuracy of the positioning bracket 4.

[0114] Similarly, after determining the height of the second vertical control plate 455, it is also necessary to determine its horizontal position. Therefore, after determining the height of the second vertical control plate 455, it is pre-fixed using the quick-fixing piece 5 to prevent it from shifting during subsequent adjustments. When fixing the second vertical control plate 455 using the quick-fixing piece 5, first adjust the position of the fixing housing 51 so that the vertical surface of the second vertical control plate 455 is between the two clamping blocks 57; then rotate the rotating rod 54 to make the fixing rod 53 abut against the positioning post 41; then rotate the two positioning screws 58 respectively to clamp the two clamping blocks 57 to achieve pre-fixation of the second vertical control plate 455, preventing it from shifting during the rotation of the third fixing nut 453 and the fourth fixing nut 454, thus improving the positioning accuracy of the positioning bracket 4.

[0115] The implementation principle of the prestressed tensioning system described in this application embodiment is as follows: After the tensioning of the steel strand 13 is completed, concrete is poured between the stress diffuser 3 and the embedded part 2 to fix the steel strand 13, the stress diffuser 3 and the embedded part 2 relatively. This ensures that the tension stress of the steel strand 13 is applied to the embedded part 2 through the stress diffuser 3, and then to the end beam 11 through the embedded part 2. This expands the force application area of ​​the tension stress of the steel strand 13 on the end beam 11, thereby reducing the local stress generated by the steel strand 13 on the end beam 11 and avoiding damage to the end beam 11 caused by the tension stress of the steel strand 13.

[0116] This application also discloses a construction method for a prestressed tensioning system.

[0117] A construction method for a prestressed tensioning system, based on the aforementioned prestressed tensioning system, includes the following steps:

[0118] The location and quantity of steel strand 13 are determined according to the process requirements, and the embedded parts 2 are prefabricated according to the location and quantity of steel strand 13.

[0119] Install positioning bracket 4 to fix the position of embedded part 2;

[0120] Cast the end crossbeam 11 so that the embedded part 2 and the positioning bracket 4 are embedded in the end crossbeam 11;

[0121] Install the stress diffuser 3 on the embedded part 2 and pour concrete into the feed chamber 34;

[0122] Thread the steel strand 13 and perform tensioning operations to bring the steel strand 13 into a taut state;

[0123] On base 1, the reinforcement cage of the pipe beam is tied and the concrete is poured.

[0124] After the pipe beam is poured, the steel strand 13 is released.

[0125] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pre-stress tensioning system, characterized in that, Include: Base (1); End crossbeam (11), the end crossbeam (11) is provided with two, two the end crossbeam (11) is symmetrical and fixedly installed on the base (1); Support column (12), the support column (12) is provided with two, two the support column (12) is symmetrical and fixedly installed on the base (1), the support column (12) both ends are respectively fixedly connected with two the end crossbeam (11); Steel strand (13), the steel strand (13) is provided with a plurality of, the steel strand (13) both ends are respectively threaded in two the end crossbeam (11); Multiple groups of embedded parts (2), multiple groups of the embedded part (2) are respectively embedded in two the end crossbeam (11), the steel strand is threaded in the embedded part (2); Stress diffusion piece (3), the stress diffusion piece (3) includes: Stress plate (31), a plurality of stress holes (311) are formed in the stress plate (31), and the steel strand (13) is threaded in the stress hole (311) one by one; Reinforcing plate (32), the reinforcing plate (32) is provided with a plurality of, the reinforcing plate (32) is fixedly installed on the stress plate (31), and the reinforcing plate (32) is connected with the embedded part (2); Bottom plate (33), the bottom plate (33) is fixedly installed on the bottom of the stress plate (31), and the bottom plate (33) is fixedly connected with the reinforcing plate (32).

2. The pre-stressing tensioning system according to claim 1, characterized in that, Each group of the embedded part (2) includes: Embedded steel plate (21), the embedded steel plate (21) is provided with two, two the embedded steel plate (21) is respectively arranged on the two side faces of a piece end crossbeam (11), and the reinforcing plate (32) and the bottom plate (33) are fixedly connected with the embedded steel plate (21); Embedded steel pipe (22), the embedded steel pipe (22) is threaded and fixedly installed on two the embedded steel plate (21), and the steel strand (13) is threaded in the embedded steel pipe (22) one by one.

3. The pre-stressing tensioning system according to claim 1, characterized in that, The embedded part (2), the stress plate (31) and the bottom plate (33) are collectively surrounded to form a feeding cavity (34); The feeding cavity (34) is filled with concrete.

4. The pre-stressing tensioning system according to claim 1, characterized in that, The reinforcing plate (32) is provided with a side hole (321), a transverse steel bar (35) is threaded in the side hole (321), and the transverse steel bar (35) is fixedly connected with the reinforcing plate (32).

5. The pre-stressing tensioning system according to claim 2, wherein, Further include positioning support (4), the positioning support (4) includes: Positioning column (41), the positioning column (41) is provided with two, two the positioning column (41) is symmetrical and fixedly installed on the base (1); Horizontal connecting rod (42), two ends of the horizontal connecting rod (42) are fixedly connected with two the positioning column (41); Positioning inclined brace (43), one end of the positioning inclined brace (43) is fixedly connected with the positioning column (41), and the other end of the positioning inclined brace (43) is fixedly connected with the base (1); Upper positioning part (44), the upper positioning part (44) is arranged on the positioning column (41), and the top of the embedded steel plate (21) is connected with the upper positioning part (44); A lower positioning member (45) is arranged on the positioning column (41), and the bottom of the embedded steel plate (21) is connected with the lower positioning member (45).

6. A pre-stressing tensioning system according to claim 5, characterised in that, The upper positioning member (44) comprises: A first angle steel (441) is fixedly installed on the positioning column (41), and a first positioning groove (4411) is formed in the first angle steel (441); A first screw rod (442) is arranged in the first positioning groove (4411), and a first fixing nut (443) and a second fixing nut (444) are threadedly connected to the first screw rod (442); the first fixing nut (443) is in abutment with the first angle steel (441), and the first fixing nut (443) is used for fixing the relative position of the first screw rod (442) and the first angle steel (441); A second angle steel (445) is provided with a second positioning groove (4451), and the first screw rod (442) is arranged in the second positioning groove (4451); the second fixing nut (444) is in abutment with the second angle steel (445), and the second fixing nut (444) is used for fixing the relative position of the first screw rod (442) and the second angle steel (445); and the second angle steel (445) is in abutment with the embedded steel plate (21).

7. A pre-stressing tensioning system according to claim 6, characterised in that, The lower positioning member (45) comprises: A first vertical control plate (451) is fixedly installed on the positioning column (41), and a third positioning groove (4511) is formed in the first vertical control plate (451); A second screw rod (452) is arranged in the third positioning groove (4511), and a third fixing nut (453) and a fourth fixing nut (454) are threadedly connected to the second screw rod (452); the third fixing nut (453) is in abutment with the first vertical control plate (451), and the third fixing nut (453) is used for fixing the relative position of the second screw rod (452) and the first vertical control plate (451); A second vertical control plate (455) is provided with a fourth positioning groove (4551), and the second screw rod (452) is arranged in the fourth positioning groove (4551); the fourth fixing nut (454) is in abutment with the second vertical control plate (455), and the fourth fixing nut (454) is used for fixing the relative position of the second screw rod (452) and the second vertical control plate (455); and the second vertical control plate (455) is in abutment with the embedded steel plate (21).

8. A pre-stressing tensioning system according to claim 7, characterised in that, The second angle steel (445) and the second vertical control plate (455) are welded to the embedded steel plate (21).

9. The pre-stressing tensioning system according to claim 7, characterized in that, The quick fixing member (5) comprises: A fixing shell (51) is connected with the positioning column (41); A fixed plate (52) is fixedly installed on the fixed shell (51), and a guide groove (521) is formed in the fixed plate (52); Two fixed rods (53) are symmetrically arranged and slidably installed on the fixed shell (51), and the fixed rods (53) abut against the positioning column (41); A rotating rod (54) is arranged and threadedly connected to the fixed shell (51); An abutting block (55) is slidably installed in the fixed shell (51), the abutting block (55) is in a circular truncated cone shape, the abutting block (55) abuts against the fixed rods (53) on both sides, and the abutting block (55) is rotationally connected to the rotating rod (54) at the top end; A sliding plate (56) is slidably installed on the guide groove (521); Two clamping blocks (57) are symmetrically and slidably installed on the sliding plate (56); Two positioning screws (58) are rotationally installed on the sliding plate (56), and the clamping blocks (57) are threadedly connected to the positioning screws (58) in a one-to-one correspondence.

10. A method of constructing a pre-stressed tensioning system, characterized in that, The prestress tensioning system according to any one of claims 1-9, comprising the following steps: According to the process requirements, the positions and the number of the steel strands (13) are determined, and the embedded parts (2) are prefabricated according to the positions and the number of the steel strands (13); The positioning support (4) is installed to fix the position of the embedded part (2); The end beam (11) is poured to embed the embedded part (2) and the positioning support (4) in the end beam (11); The stress diffusion part (3) is installed on the embedded part (2), and the concrete is poured into the feeding cavity (34); The steel strand (13) is arranged and tensioned to be in a tensioned state; The pipe beam reinforcement cage is tied and the concrete is poured on the base (1); After the pipe beam is poured, the steel strand (13) is released.

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