Broken line pre-tensioning I-shaped beam tensioning pedestal
By designing the folded line, the I-beam tensioning base is first opened, and a concrete base layer and a force-transmitting wall structure is adopted, and the tensioning folded line and straight line are combined to solve the problems of complex structure, large steel use, and concentrated stress, and the tensioning base structure is achieved with high stiffness, low deformation and economicality.
Patent Information
- Application Number
- CN202421419546.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-06-20
AI Technical Summary
The existing steel frame tensioning pedestals have complex connections of steel components, large amount of steel used, poor economicality, and high temperature impact; anchored pedestals require good foundations, concentrated stress at the tensioning end, high risk of damage, difficult component deformation and difficult coordination, and complex anchored connections.
A tensile base of I-beam tensioning is designed, using a concrete base layer, a force transmission wall, a supporting beam and a pedestal panel. Through the cooperation of the tensioning line and straight line, the tensioning force is transmitted, the anchor connection is reduced, and the structural stiffness and stability are improved.
It achieves a simple structure, few anchor connections, large stiffness, small deformation, and can withstand large tension forces, avoiding damage caused by concentrated stress at the tension end of the pedestal.
Smart Images
Figure CN222768706U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of prefabricated beam tensioning in bridge construction, in particular to a fold line pre-tensioned I-beam tensioning pedestal. Background Art
[0002] Pre-tensioned I-beams have been increasingly used in bridge construction. The existing integral steel frame tensioning pedestal is made of various steel components welded or bolted together, with many anchoring points and complex steel component connections. In addition, because precast beams are usually long, steel is less rigid than concrete, and a large amount of steel is needed to increase the rigidity of the frame pedestal, so the amount of steel used is large and not economical. Steel components are easily affected by temperature, resulting in significant thermal expansion and contraction deformation, which is not conducive to the production of precast beams.
[0003] The tensioning end of the existing anchored tensioning pedestal requires special treatment, and needs to be expanded with concrete foundation and deeper anti-pulling piles (which require good foundation bearing capacity and friction resistance) to consolidate with the tensioning structure to increase the anti-overturning capacity of the tensioning end. The tensioning end of this type of pedestal is subjected to concentrated force and force transmission, and the deformation coordination is complex. Due to the repeated operation of the tensioning work, the bending resistance, connection quality and fatigue resistance of each component are required to be high. At the same time, the tensioning end of the anchored pedestal has many connections, and the various connections such as welding and pinning of each component are complex.
[0004] In summary, the existing steel frame pedestals have the problems of complex steel component connections, large steel consumption, poor economy, and great temperature influence; the anchored pedestals not only require a good foundation, but also have concentrated forces on the tensioning end, high risk of damage, difficult component deformation coordination, and complex anchoring connections. Therefore, the utility model proposes a fold line pre-tensioned I-beam tensioning pedestal to solve the above problems. Utility Model Content
[0005] In order to overcome the problems of the existing steel frame pedestal, such as complex steel component connection, large steel consumption, poor economy, and great temperature influence; the anchored pedestal not only requires a good foundation, but also has concentrated force on the tensioning end, high risk of damage, difficult component deformation coordination, and complex anchoring connection, the utility model provides a fold line pre-tensioned I-beam tensioning pedestal. The technical solution is as follows:
[0006] A fold line pre-tensioned I-beam tensioning pedestal, comprising a concrete base, with force transfer walls fixed on both sides above the concrete base, a plurality of supporting beams arranged above the concrete base, a pedestal panel fixed above the supporting beams, and the supporting beams and the pedestal panel are located between the force transfer walls on both sides, an upper beam for tensioning fold line reinforcement and a lower fixed beam for tensioning straight line reinforcement are fixed at both ends of the force transfer walls, a jack 2 is arranged on the outer side of the upper beam, a jack 1 is connected to the outer side of the lower fixed beam, the top rod of the jack 1 is connected to the lower movable beam, and a bender is fixed above the pedestal panel near both ends.
[0007] Furthermore, a plurality of channel windows are provided on the force transfer wall, and the channel windows are located in the middle part of the force transfer wall where the force is less stressed. This not only saves resources and reduces construction costs while ensuring that the function of the force transfer wall is not affected, but the channel windows can also be passed through by construction workers, facilitating construction.
[0008] Furthermore, load-bearing foundations are fixed at the positions at both ends of the I-beam to be cast below the concrete base, and the load-bearing foundations mainly bear the concentrated force on the ends of the I-beam after the I-beam is tensioned.
[0009] Furthermore, a steel strand positioning plate 14 is fixed to the outer side surface of the upper crossbeam 5, and the broken line reinforcement passes through the upper crossbeam 5, the positioning plate 14, and the jack 9 in sequence and is fixed to the top rod of the jack 9 through an anchor. A steel strand positioning plate 13 is fixed to the outer side surfaces of the lower fixed crossbeam 6 and the lower movable crossbeam 8, and the straight line reinforcement passes through the lower fixed crossbeam 6, the positioning plate 13 on the lower fixed crossbeam 6, and the lower movable crossbeam 8 in sequence and is connected with the positioning plate 13 on the lower movable crossbeam 8. The steel strand positioning plate 2 is welded to the outer side surface of the upper crossbeam, and the jack 2 is fixedly installed on the outer side surface of the steel strand positioning plate 2.
[0010] Furthermore, supporting brackets capable of placing the upper beam are provided at both ends of the force transmission wall.
[0011] Furthermore, an anti-pullout pile is fixed at a position corresponding to the bender below the concrete base, and the upper end of the anti-pullout pile is fixedly connected to the supporting beam. The steel strand applies an upward force to the bender, and the anti-pullout pile can provide a downward reaction force for the bender to increase its stability.
[0012] Furthermore, a tie beam is fixed above the concrete base, and both ends of the tie beam are fixedly connected to the force transfer walls on both sides of the concrete base respectively. The tie beam is a reinforced concrete structure. The middle section of the tie beam is cast first, and then the reserved steel bars at both ends of the tie beam are deeply inserted into the force transfer wall, and then cast together with the force transfer wall at a later stage, so that the tie beam and the force transfer wall form a rigid connection, which can increase the force-bearing performance of the tensioning pedestal.
[0013] Furthermore, both ends of the force transmission wall are force transmission reinforcement sections, which gradually thicken from the inner end to the outer end, and the force transmission reinforcement sections are pre-embedded with steel plates and cast integrally with the force transmission wall in the middle section.
[0014] Furthermore, a plurality of channel steels are fixed between the supporting crossbeam and the pedestal panel, and the channel steels are arranged perpendicular to the supporting crossbeam. The arrangement of the channel steels is conducive to laying and fixing the pedestal panel.
[0015] Furthermore, bogies are fixed at both ends of the concrete base and on the inner side of the upper cross beam, and the bogies make the turning of the steel strands at the tensioning end smoother, which is convenient for tensioning the steel strands.
[0016] The beneficial effects of the technical solution provided by the utility model are as follows: the tensioning pedestal has a simple structure, fewer anchoring connections, high rigidity, small deformation, and can withstand large tensioning forces. The tensioning force of the prefabricated beam is converted into the internal force of the force transfer wall through the force transfer wall and the corresponding structure. There is no need to make a deeper anti-pullout device or counterweight at the end of the I-beam to be cast to resist the tensioning bending moment. At the same time, the problem of concentrated force on the tensioning end of the pedestal being prone to damage is avoided. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings used in the embodiments. Obviously, the drawings listed below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;
[0019] Figure 2 The internal structure of the embodiment of the utility model is shown in FIG. Figure 1 ;
[0020] Figure 3 yes Figure 2 Schematic diagram of the structure at A in the middle;
[0021] Figure 4 yes Figure 2 Schematic diagram of the structure at B in the middle;
[0022] Figure 5 The internal structure of the embodiment of the utility model is shown in FIG. Figure 2 .
[0023] In the attached drawings, the components represented by each number are listed as follows: 1. Concrete base; 2. Force transfer wall; 3. Support beam; 4. Pedestal panel; 5. Upper beam; 6. Lower fixed beam; 7. Jack one; 8. Lower movable beam; 9. Jack two; 11. Passage window; 12. Load-bearing foundation; 13. Steel strand positioning plate one; 14. Steel strand positioning plate two; 15. Support corbel; 16. Pull-out pile; 17. Tie beam; 18. Force transfer stiffening section; 19. Channel steel; 20. Bogie; 21. I-beam to be cast. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.
[0025] See also Figures 1 to 5 The embodiment of the utility model provides a fold line pre-tensioned I-beam tensioning pedestal, including a concrete base 1, force transfer walls 2 are fixed on both sides above the concrete base 1, a plurality of supporting beams 3 are arranged above the concrete base 1, a pedestal panel 4 is fixed above the supporting beams 3, and the supporting beams 3 and the pedestal panel 4 are located between the force transfer walls 2 on both sides, an upper beam 5 for tensioning fold line tendons and a lower fixed beam 6 for tensioning straight line tendons are fixed at both ends of the force transfer walls 2, a jack 2 9 is arranged on the outer side of the upper beam 5, a jack 1 7 is connected to the outer side of the lower fixed beam 6, the top rod of the jack 1 7 is connected to the lower movable beam 8, and a bending device is fixed near the two ends above the pedestal panel 4.
[0026] A plurality of passage windows 11 are provided on the force transmission wall 2 ; support brackets 15 capable of placing the upper cross beam 5 are provided at both ends of the force transmission wall 2 .
[0027] Under the concrete base layer 1, load-bearing foundations 12 are fixed at both ends of the I-beam to be poured.
[0028] A steel strand positioning plate 14 is fixed to the outer side of the upper crossbeam 5, and the broken line reinforcement passes through the upper crossbeam 5, the positioning plate 14, and the jack 9 in sequence and is fixed to the top rod of the jack 9 through anchors. A steel strand positioning plate 13 is fixed to the outer sides of the lower fixed crossbeam 6 and the lower movable crossbeam 8, and the straight line reinforcement passes through the lower fixed crossbeam 6, the positioning plate 13 on the lower fixed crossbeam 6, and the lower movable crossbeam 8 in sequence and is connected to the positioning plate 13 on the lower movable crossbeam 8. The steel strand positioning plate 2 is welded to the outer side of the upper crossbeam, and the jack 2 is fixedly installed on the outer side of the steel strand positioning plate 2; the steel strand straight line reinforcement is respectively connected to the positioning plate 13 on the lower fixed crossbeam 6 and the positioning plate 13 on the lower movable crossbeam 8 through anchors.
[0029] An anti-pullout pile 16 is fixed below the concrete base layer 1 at a position corresponding to the bending device, and the upper end of the anti-pullout pile 16 is fixedly connected to the supporting beam 3.
[0030] A tie beam 17 is fixed above the concrete base 1 , and both ends of the tie beam 17 are fixedly connected to the force transfer walls 2 on both sides of the concrete base 1 .
[0031] Both ends of the force transmission wall 2 are force transmission reinforcement sections 18, which gradually thicken from the inner end to the outer end, and have embedded steel plates inside the force transmission reinforcement sections 18 and are cast integrally with the force transmission wall 2 in the middle section.
[0032] A plurality of channel steels 19 are fixed between the supporting cross beam 3 and the pedestal panel 4 , and the channel steels 19 are arranged perpendicular to the supporting cross beam 3 .
[0033] Bogies 20 are fixed at both ends of the concrete base 1 and inside the upper cross beam 5 .
[0034] The construction and use process of this pedestal: During the construction of this pedestal, the prefabricated beam foundation is first leveled and compacted, and a concrete load-bearing foundation 12 is set at the beam end position of the I-beam 21 to be cast, so as to better bear the weight of the I-beam 21 to be cast; a pull-out pile 16 is pre-set at the position of the bender, which is made of concrete, equipped with steel bars inside and embedded with anchoring embedded parts at the connection with the tensioning pedestal; then the concrete base 1 is constructed, and after the concrete base 1 is cast and formed, the middle section of the tie beam 17 is constructed, and the steel bars reserved at both ends of the tie beam 17 are fixedly connected with the steel bars in the force transfer wall 2, and the two ends of the tie beam 17, the force transfer wall 2, the force transfer stiffening section 18 and the supporting corbel 15 are cast and formed as a whole, wherein the steel plate is pre-buried at the joint between the end of the force transfer wall 2 and the upper crossbeam 5 and the lower fixed crossbeam 6, and the pre-buried steel plate is flat, so that it can fit tightly in the later stage, which can increase the rigidity of the two ends of the force transfer wall, and better transfer Transfer the tensile stress of the steel strand to the force-transmitting wall 2; then weld the steel strand positioning plate 13 to the outer sides of the lower fixed beam 6 and the lower movable beam 8 respectively, place the upper beam 5 and the lower fixed beam 6 at both ends of the force-transmitting wall 2, and install a jack 7 between the lower fixed beam 6 and the lower movable beam 8; then fix the supporting beam 3 on the concrete base 1, and anchor the supporting beam 3 to the pull-out pile 16 through embedded parts at the pull-out pile 16, then install the channel steel 19 on the supporting beam 3 in a direction perpendicular to the supporting beam 3, lay and fix the pedestal panel 4 on the channel steel 19, weld and fix the pedestal panel 4 to the channel steel 19, install the bender on the supporting beam 3, and locally reinforce the supporting beam 3 at that location; then install the bogie 20 about 1m outside the beam end of the I-beam 21 to be cast, and anchor the bogie 20 on the concrete base 1;
[0035] The prestressed steel strands of the straight reinforcement part are connected to the steel strand positioning plates 13 on the lower fixed beam 6 and the lower movable beam 8 at both ends of the force transmission wall 2, and are fixed in position by anchors. The prestressed steel strands of the broken reinforcement part are connected to the steel strand positioning plates 14 of the upper beams at both ends of the force transmission wall 2 through the bender and the bogie 20, and then pass through the small through-type jack 29 and are fixed by anchors; then the tensioning operation is carried out by jack 1 7 and jack 29.
[0036] The above are only preferred embodiments of the present invention and are 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 fold line pre-tensioned I-beam tensioning pedestal, characterized in that: The invention comprises a concrete base (1), wherein force transfer walls (2) are fixed on both sides above the concrete base (1), a plurality of support beams (3) are arranged above the concrete base (1), a pedestal panel (4) is fixed above the support beams (3), and the support beams (3) and the pedestal panel (4) are located between the force transfer walls (2) on both sides, an upper beam (5) for tensioning folded reinforcement and a lower fixed beam (6) for tensioning straight reinforcement are fixed at both ends of the force transfer wall (2), a jack 2 (9) is arranged on the outer side of the upper beam (5), a jack 1 (7) is connected to the outer side of the lower fixed beam (6), a top rod of the jack 1 (7) is connected to a lower movable beam (8), and a bending device is fixed above the pedestal panel (4) near both ends.
2. The fold line pre-tensioned I-beam tensioning pedestal according to claim 1, characterized in that: A plurality of channel windows (11) are provided on the force transmission wall (2).
3. The fold line pre-tensioned I-beam tensioning pedestal according to claim 1, characterized in that: Load-bearing foundations (12) are fixed below the concrete base layer (1) at the positions at both ends of the I-beam to be cast.
4. The fold line pre-tensioned I-beam tensioning pedestal according to claim 1, characterized in that: A second steel strand positioning plate (14) is fixed on the outer side of the upper crossbeam (5); a folded line reinforcement sequentially passes through the upper crossbeam (5), the second positioning plate (14), and the second jack (9) and is fixed to the top rod of the second jack (9) through an anchor; a first steel strand positioning plate (13) is fixed on the outer side of the lower fixed crossbeam (6) and the lower movable crossbeam (8); and a straight line reinforcement sequentially passes through the lower fixed crossbeam (6), the first positioning plate (13) on the lower fixed crossbeam (6), and the lower movable crossbeam (8) and is connected to the first positioning plate (13) on the lower movable crossbeam (8).
5. The fold line pre-tensioned I-beam tensioning pedestal according to claim 1, characterized in that: Support brackets (15) capable of placing the upper crossbeam (5) are provided at both ends of the force transmission wall (2).
6. The fold line pre-tensioned I-beam tensioning pedestal according to claim 1, characterized in that: An anti-pullout pile (16) is fixed below the concrete base layer (1) at a position corresponding to the bending device, and the upper end of the anti-pullout pile (16) is fixedly connected to the supporting crossbeam (3).
7. The fold line pre-tensioned I-beam tensioning pedestal according to claim 1, characterized in that: A tie beam (17) is fixed above the concrete base (1), and two ends of the tie beam (17) are respectively fixedly connected to the force transfer walls (2) on both sides of the concrete base (1).
8. The fold line pre-tensioned I-beam tensioning pedestal according to claim 1, characterized in that: Both ends of the force transmission wall (2) are force transmission reinforcement sections (18), the force transmission reinforcement sections (18) gradually thicken from the inner end to the outer end, and the force transmission reinforcement sections (18) have embedded steel plates inside and are integrally cast with the force transmission wall (2) in the middle section.
9. The fold line pre-tensioned I-beam tensioning pedestal according to claim 1, characterized in that: A plurality of channel steels (19) are fixed between the supporting crossbeam (3) and the pedestal panel (4), and the channel steels (19) are arranged perpendicular to the supporting crossbeam (3).
10. The fold line pre-tensioned I-beam tensioning pedestal according to claim 1, characterized in that: Bogies (20) are fixed at both ends of the concrete base (1) and located on the inner side of the upper cross beam (5).