Open-web continuous rigid frame bridge and construction method thereof
By setting up steel pipes in the steel box oblique brace of the fasting continuous rigid frame bridge and pouring lightweight high-strength concrete, the problem of deflection and cracking of the continuous rigid frame bridge of large span prestressed concrete is solved, the stiffness and load-bearing capacity of the bridge are improved, and the construction cost and time are reduced.
Patent Information
- Application Number
- CN202510189448.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-04-11
AI Technical Summary
During the operation of large-span prestressed concrete continuous rigid structure bridges, such as beam cracking, excessive span deflection, exposed steel bars, wear of pavement layers, and uneven linear shape of the bridge deck, resulting in a decrease in load-bearing capacity and affecting driving safety and structural durability.
The fasting continuous rigid structure bridge structure is adopted. By setting steel pipes in the steel box oblique brace and pouring lightweight high-strength concrete into the steel pipe during the construction process, the rigidity and load bearing capacity of the steel box oblique brace are improved, while reducing the wall thickness of the steel box oblique brace, reducing welding requirements and improving construction speed.
It effectively solves the problems of underbridge deflection and cracking, improves the stiffness and load-bearing capacity of the bridge, reduces construction costs and time, and extends the service life of the bridge.
Smart Images
Figure CN119800827A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of bridge engineering, and more particularly to a hollow continuous rigid frame bridge and a construction method thereof. Background Art
[0002] The prestressed concrete continuous rigid frame bridge adopts a structural form of continuous beam and pier-beam consolidation, which effectively improves the bearing capacity of the box beam, ensures the longitudinal bending stiffness and transverse torsional stiffness while reducing the cross-sectional size. The applicable span can reach 150m-300m. Among various available bridge types, it has overwhelming technical and economic advantages.
[0003] As the operation time increases, prestressed concrete continuous rigid frame bridges gradually develop beam cracks, excessive mid-span deflection, exposed steel bars, pavement wear, uneven bridge deck lines, etc. under the influence of various factors such as concrete shrinkage and creep, loss of prestress, and the increase in overloaded vehicles in operation. Under the coupling effect of these diseases, the bearing capacity of the bridge is reduced and cannot meet the requirements of the normal use limit state, affecting driving safety and structural durability.
[0004] Among them, web cracking and continuous deflection in the mid-span have the most significant impact on the bridge. The two are coupled with each other, further increasing the mid-span deflection. The continuous deflection of the continuous rigid frame bridge is the result of the coupling of various factors. The deflection of the main beam is affected by factors such as the size of prestress and structural stiffness. From the perspective of the force mechanism, when the effect provided by the prestressed steel beam is smaller than the effect of other loads, the structure will deflect; from the perspective of cross-sectional stiffness, under the influence of factors such as concrete shrinkage creep, prestress loss, and cross-sectional cracking, the cross-sectional stiffness is reduced, thereby increasing the deflection of the main beam in the mid-span. At present, the main characteristics of the deflection of continuous rigid frame bridges are: the long-term deflection of the main beam is too large, which affects driving safety and comfort and reduces the performance of the structure; as the deflection continues to increase, a large number of cracks appear in the beam body; due to the lack of obvious convergence of prestress loss and concrete shrinkage creep, the main beam continues to deflect under long-term action.
[0005] In order to solve the deflection problem of long-span prestressed concrete continuous rigid frame bridges, engineers have developed hollow continuous rigid frame bridges using concrete box braces or steel box braces, which effectively solve the problem of cracking of the web above the pier in the continuous rigid frame bridge, and greatly reduce the deadweight of the bridge, providing a good solution to reduce the long-term deflection problem of the bridge. However, the concrete box brace still has the problem of heavy deadweight, and can only be constructed by cantilever casting method supported by temporary inclined cables, and the concrete brace itself also has shrinkage creep deformation problems; compared with the concrete brace, the deadweight of the steel box brace is greatly reduced, but in order to bear the huge axial force, the wall thickness of the steel box brace is generally more than 40mm, the welding requirements are high, the hoisting weight is also large, and the steel box wall has the problem of instability under pressure. Summary of the invention
[0006] In view of this, the present invention provides a hollow continuous rigid frame bridge and a construction method thereof, which ensures the rigidity and bearing capacity of the steel box brace, while reducing the wall thickness of the steel box brace, lowering the welding requirements and increasing the construction speed. In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0007] In one aspect, the present invention provides a hollow continuous rigid frame bridge, comprising:
[0008] The pier body includes a main pier and a side pier, wherein two side piers are provided, and the two side piers are respectively constructed at two ends of the construction area, and a main pier is constructed between the two side piers;
[0009] A main beam, wherein the main beam is connected to the top of two adjacent main piers or a side pier and an adjacent main pier;
[0010] A steel box brace, one end of which is connected to the bottom of the first end of the main beam, and the other end of which is connected to the side wall of the main pier or the side pier connected to the first end of the main beam. A steel pipe is arranged inside the steel box brace. During the construction process, concrete is poured into the steel pipe to improve the performance of the steel box brace.
[0011] Furthermore, the steel box brace includes a first steel box segment, an intermediate steel box segment and a second steel box segment, wherein the first steel box segment, the intermediate steel box segment and the second steel box segment are each provided with a cross partition at intervals, wherein the cross partition is provided with a through hole, wherein a steel pipe segment is provided in the through hole, wherein the first steel box segment, the intermediate steel box segment and the second steel box segment are connected in sequence to form a steel box brace, wherein the first steel box segment is connected to the main pier or the side pier, wherein the second steel box segment is connected to the main beam, and wherein the steel pipe segments in the first steel box segment, the intermediate steel box segment and the second steel box segment are connected in sequence to form a steel pipe.
[0012] Furthermore, the steel pipe segment in the first steel box segment extends from the first steel box segment and extends into the main pier or the side pier, and the steel pipe segment in the second steel box segment is shorter than the second steel box segment.
[0013] Furthermore, a first welding stud is provided on the outer wall of the connection between the steel pipe segment in the first steel box segment and the main pier or the side pier.
[0014] Furthermore, a second welding nail and a third welding nail are respectively provided on an inner wall of the second steel box segment and an outer wall of the steel pipe segment in the second steel box segment close to one end of the main beam.
[0015] Furthermore, reinforcing ribs are arranged on the inner walls of the first steel box segment, the second steel box segment and the middle steel box segment.
[0016] Furthermore, a first pressure-bearing plate is provided on the outer wall of the connection between the main pier or the side pier and the first steel box segment.
[0017] Furthermore, a second pressure plate is provided inside the second steel box segment at one end close to the main beam, each side wall of the second pressure plate is connected to the inner wall of the second steel box segment, and the second pressure plate is provided with a through hole for the steel pipe to pass through.
[0018] On the other hand, the present invention further provides a construction method for a hollow continuous rigid frame bridge, the construction method is used for the construction of the above hollow continuous rigid frame bridge, and comprises the following steps:
[0019] S10: construct the cap, main pier and side pier, and embed the steel pipe segment extending from the first steel box segment in the main pier or side pier to complete the fixation of the first steel box segment;
[0020] S20: The main beam is constructed by cantilever casting method;
[0021] S30: sequentially connecting the middle steel box segment and the second steel box segment at one end of the first steel box segment away from the main pier or the side pier;
[0022] S40: pouring lightweight high-strength concrete into the steel pipe;
[0023] S50: pouring concrete into the second steel box segment to connect the second steel box segment and the main beam;
[0024] S60: Continue to use the cantilever casting method to construct subsequent main beams until the bridge is completed.
[0025] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a hollow continuous rigid frame bridge, in which steel pipes are arranged in the steel box diagonal braces. During the construction process, lightweight high-strength concrete is poured in the steel pipes to improve the stiffness and bearing capacity of the steel box diagonal braces, while avoiding the problems of deflection and cracking. The bridge is suitable for continuous rigid frame bridges with larger spans. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0027] Figure 1 A schematic diagram of the structure of the hollow continuous rigid frame bridge provided by the present invention;
[0028] Figure 2 A schematic diagram of the structure of the steel box diagonal brace provided by the present invention;
[0029] Figure 3 A schematic diagram of the structure of the connection between the steel box diagonal brace and the main beam provided by the present invention;
[0030] Figure 4 A schematic diagram of the structure of the connection between the steel box diagonal brace and the pier body provided by the present invention;
[0031] Figure 5 The present invention provides Figure 2 The cross-sectional view at AA of FIG.
[0032] Figure 6 The present invention provides Figure 2 The cross-sectional view at BB;
[0033] Figure 7 The present invention provides Figure 3 Cross-sectional view at CC of .
[0034] In the figure: 1. steel box diagonal brace; 2. main beam; 3. main pier; 4. side pier; 5. cap; 6. first steel box segment; 7. second steel box segment; 8. steel pipe; 9. outer wall of steel pipe; 10. lightweight high-strength concrete; 11. second pressure plate; 12. wall panel; 13. third weld; 14. second weld; 15. cross partition; 16. first pressure plate; 17. first weld; 18. reinforcing rib. DETAILED DESCRIPTION
[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0036] See also Figure 1-7 , the embodiment of the present invention discloses a hollow continuous rigid frame bridge and a construction method thereof.
[0037] In one aspect, the present invention provides a hollow continuous rigid frame bridge, comprising:
[0038] The pier body includes a main pier 3 and a side pier 4. Two side piers 4 are provided. The two side piers 4 are constructed at two ends of the construction area respectively. The main pier 3 is constructed between the two side piers 4.
[0039] A main beam 2, the main beam 2 is connected to the top of two adjacent main piers 3 or the side pier 4 and the adjacent main pier 3;
[0040] A steel box brace 1, one end of which is connected to the bottom of the first end of the main beam 2, and the other end of which is connected to the side wall of the main pier 3 or the side pier 4 connected to the first end of the main beam 2. A steel pipe 8 is arranged inside the steel box brace 1. During the construction process, concrete is poured into the steel pipe 8 to improve the performance of the steel box brace 1.
[0041] By arranging the steel pipe 8 inside the steel box brace 1, during the construction process, lightweight high-strength concrete 10 is poured into the steel pipe 8 to form a steel box brace 1 with a built-in steel tube concrete core, thereby improving the rigidity and bearing capacity of the steel box brace 1. At the same time, the thickness of the wall panel 12 of the steel box brace 1 can be reduced, the welding requirements during the construction process can be reduced, the construction speed can be accelerated, and the problems of deflection and cracking can be avoided.
[0042] In some embodiments, the steel box brace 1 includes a first steel box segment 6, an intermediate steel box segment and a second steel box segment 7. The first steel box segment 6, the intermediate steel box segment and the second steel box segment 7 are all spaced apart with transverse partitions 15. The transverse partitions 15 are provided with through holes. Steel pipe segments are provided in the through holes. The first steel box segment 6, the intermediate steel box segment and the second steel box segment 7 are connected in sequence to form the steel box brace 1. The first steel box segment 6 is connected to the main pier 3 or the side pier 4. The second steel box segment 7 is connected to the main beam 2. The steel pipe segments in the first steel box segment 6, the intermediate steel box segment and the second steel box segment are connected in sequence to form a steel pipe 8.
[0043] The lateral stiffness of the steel box brace 1 is enhanced by the transverse partition 15. At the same time, the outer wall 9 of the steel pipe is connected to the transverse partition 15, and the steel pipe segments are positioned through the through holes on each transverse partition 15, so as to ensure that during the construction process, after the first steel box segment 6, the middle steel box segment and the second steel box segment 7 are welded together, the steel pipe segments inside the first steel box segment 6, the middle steel box segment and the second steel box segment 7 can be spliced together in sequence to ensure the tightness of the splicing of each steel pipe segment, and to ensure that during the pouring of the lightweight and high-strength concrete 10, the lightweight and high-strength concrete 10 can flow smoothly from the steel pipe segment in the second steel box segment 7 to the steel pipe segment in the first steel box segment 6.
[0044] In some embodiments, the steel pipe segment in the first steel box segment 6 extends from the first steel box segment 6 into the main pier 3 or the side pier 4 , and the steel pipe segment in the second steel box segment 7 is shorter than the second steel box segment 7 .
[0045] During the construction of the main pier 3 or the side pier 4 , the steel pipe segment extending from the first steel box segment 6 is constructed inside the main pier 3 or the side pier 4 to complete the connection between the first steel box segment 6 and the main pier 3 or the side pier 4 .
[0046] In some embodiments, a first welding stud 17 is provided on the outer wall of the connection between the steel pipe segment in the first steel box segment 6 and the main pier 3 or the side pier 4 .
[0047] In some embodiments, the inner wall of the second steel box segment 7 and the outer wall of the steel pipe segment in the second steel box segment 7 close to the end of the main beam 2 are respectively provided with a second welding nail 14 and a third welding nail 13 .
[0048] The shear force is transmitted through the first welding nail 17, the second welding nail 14 and the third welding nail 13, thereby improving the stability of the rigid frame bridge.
[0049] In some embodiments, reinforcing ribs 18 are provided on the inner walls of the first steel box segment 6 , the second steel box segment 7 and the middle steel box segment.
[0050] The stiffness of the steel box brace 1 is increased by reinforcing the ribs 18 to ensure the stability of the rigid frame bridge.
[0051] In some embodiments, a first pressure plate 16 is provided on the outer wall of the connection between the main pier 3 or the side pier 4 and the first steel box segment 6 .
[0052] In some embodiments, a second pressure plate 11 is provided inside the second steel box segment 7 at one end close to the main beam 2, each side wall of the second pressure plate 11 is connected to the inner wall of the second steel box segment 7, and the second pressure plate 11 is provided with a through hole for the steel pipe 8 to pass through.
[0053] The middle steel box segment and the second steel box segment 7 are welded in sequence at one end of the first steel box segment 6 away from the main pier 3 or the side pier 4. After the construction of the second steel box segment 7 is completed, lightweight high-strength concrete 10 is poured into the steel pipe 8, and then concrete is poured into the second steel box segment 7 to connect the second steel box segment 7 with the main beam 2, and the second pressure plate 11 is used to prevent concrete from entering the middle box beam segment.
[0054] The pressure is transmitted through the first pressure-bearing plate 16 and the second pressure-bearing plate 11 to ensure the stability of the connection between the first steel box segment 6 and the second steel box segment 7 and the concrete.
[0055] On the other hand, the present invention further provides a method for constructing a hollow continuous rigid frame bridge, the method for constructing the hollow continuous rigid frame bridge comprising the following steps:
[0056] S10: construct the cap 5, the main pier 3 and the side pier 4, and pre-embed the steel pipe segment extending from the first steel box segment 6 in the main pier 3 or the side pier 4 to complete the fixing of the first steel box segment 6;
[0057] S20: Construction of main beam 2 using cantilever casting method;
[0058] S30: sequentially connecting the middle steel box segment and the second steel box segment 7 at one end of the first steel box segment 6 away from the main pier 3 or the side pier 4;
[0059] S40: pouring lightweight high-strength concrete 10 into the steel pipe 8;
[0060] S50: pouring concrete into the second steel box segment 7 to connect the second steel box segment 7 and the main beam 2;
[0061] S60: Continue to use the cantilever casting method to construct the subsequent main beam 2 until the bridge is completed.
[0062] After the first steel box segment 6, the middle steel box segment and the second steel box segment are connected, pouring lightweight high-strength concrete 10 into the steel pipe 8 can reduce the weight of the first steel box segment 6, the middle steel box segment and the second steel box segment during the lifting process, increase the length of the lifting segment, reduce the construction steps of the steel box, and increase the construction speed.
[0063] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.
[0064] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A hollow continuous rigid frame bridge, characterized in that: include: The pier body includes a main pier and a side pier, wherein two side piers are provided, and the two side piers are respectively constructed at two ends of the construction area, and a main pier is constructed between the two side piers; A main beam, wherein the main beam is connected to the top of two adjacent main piers or a side pier and an adjacent main pier; A steel box brace, one end of which is connected to the bottom of the first end of the main beam, and the other end of which is connected to the side wall of the main pier or the side pier connected to the first end of the main beam. A steel pipe is arranged inside the steel box brace. During the construction process, concrete is poured into the steel pipe to improve the performance of the steel box brace.
2. The hollow continuous rigid frame bridge according to claim 1, characterized in that: The steel box diagonal brace includes a first steel box segment, an intermediate steel box segment and a second steel box segment. The first steel box segment, the intermediate steel box segment and the second steel box segment are all provided with cross partitions at intervals. The cross partitions are provided with through holes. Steel pipe segments are provided in the through holes. The first steel box segment, the intermediate steel box segment and the second steel box segment are connected in sequence to form a steel box diagonal brace. The first steel box segment is connected to the main pier or the side pier, and the second steel box segment is connected to the main beam. The steel pipe segments in the first steel box segment, the intermediate steel box segment and the second steel box segment are connected in sequence to form a steel pipe.
3. The hollow continuous rigid frame bridge according to claim 2, characterized in that: The steel pipe segment in the first steel box segment extends out from the first steel box segment and extends into the main pier or the side pier, and the steel pipe segment in the second steel box segment is shorter than the second steel box segment.
4. The hollow continuous rigid frame bridge according to claim 3, characterized in that: A first welding stud is arranged on the outer wall of the connection between the steel pipe segment in the first steel box segment and the main pier or the side pier.
5. The hollow continuous rigid frame bridge according to claim 2, characterized in that: A second welding nail and a third welding nail are respectively provided on the inner wall of the second steel box segment and the outer wall of the steel pipe segment in the second steel box segment at one end close to the main beam.
6. The hollow continuous rigid frame bridge according to claim 2, characterized in that: Reinforcement ribs are arranged on the inner walls of the first steel box segment, the second steel box segment and the middle steel box segment.
7. The hollow continuous rigid frame bridge according to claim 2, characterized in that: A first pressure-bearing plate is arranged on the outer wall of the connection between the main pier or the side pier and the first steel box segment.
8. The hollow continuous rigid frame bridge according to claim 2, characterized in that: A second pressure plate is provided inside the second steel box segment at one end close to the main beam, each side wall of the second pressure plate is connected to the inner wall of the second steel box segment, and the second pressure plate is provided with a through hole for the steel pipe to pass through.
9. A construction method for a hollow continuous rigid frame bridge, characterized in that: The construction method is used for the construction of the hollow continuous rigid frame bridge according to claim 8, comprising the following steps: S10: construct the cap, main pier and side pier, and embed the steel pipe segment extending from the first steel box segment in the main pier or side pier to complete the fixation of the first steel box segment; S20: The main beam is constructed by cantilever casting method; S30: sequentially connecting the middle steel box segment and the second steel box segment at one end of the first steel box segment away from the main pier or the side pier; S40: pouring lightweight high-strength concrete into the steel pipe; S50: pouring concrete into the second steel box segment to connect the second steel box segment and the main beam; S60: Continue to use the cantilever casting method to construct subsequent main beams until the bridge is completed.