Bridge pier widening and heightening reaction frame for pushing small-radius curved bridge

Abstract

The utility model belongs to the technical field of bridges, and particularly relates to a pier widening and heightening reaction frame for pushing a small-radius curve bridge. According to the device, four pieces of I-shaped steel are arranged on the bent cap to widen the bent cap, on the basis of widening, the steel stand columns are built on the four pieces of I-shaped steel, and the pushing platform is built on the steel stand columns to heighten the whole pier, so that the problem of insufficient transverse deviation rectifying space in pushing construction of the small-spacing curved bridge is solved, and the construction efficiency is improved. Tensioning stools are arranged on the two sides of the four pieces of I-shaped steel, a tensioning anchor fixing end is arranged at the pier bottom, and the tensioning stools and the tensioning anchor fixing end are connected through steel strands, so that the problem of bias load generated in the pushing process is solved.

Description

Technical Field

[0001] This utility model belongs to the field of bridge technology, specifically relating to a reaction frame for widening and heightening bridge piers in the jacking of small-radius curved bridges. Background Technology

[0002] Nowadays, bridge construction projects are becoming increasingly complex, and on-site construction is constrained by the construction environment. The jacking method has been widely used in this context because it has advantages such as minimal impact on existing traffic, low requirements for construction sites, simple construction equipment, and no need for a large amount of manpower and material resources.

[0003] For curved bridges, the jacking construction process presents challenges due to the small distance between the left and right spans. The lateral displacement of the steel box girder during jacking often requires significant construction space and results in substantial eccentric pressure. Existing reaction frames typically meet the structural load-bearing capacity under unfavorable conditions, leading to extended construction periods and increased costs. Furthermore, the conventional reaction frame supports rest directly on the pier structure, causing stress concentration and affecting the overall stability of the piers. Summary of the Invention

[0004] Due to the inherent characteristics of curved bridges, during the incremental launching construction, there are issues such as the small distance between the left and right bridge spans, which often requires a large offset space for the lateral displacement of the steel box girder, and there is also the problem of large eccentric pressure.

[0005] To overcome the problems existing in the prior art, this utility model provides a new technical approach. By setting four I-beams on the cap beam to widen it, and then building steel columns and a jacking platform to raise it on the basis of widening, the problem of insufficient lateral correction space during the jacking construction of small-spacing curved bridges is solved, and prestressed steel strands are configured to solve the eccentric load.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A reaction frame for widening and heightening bridge piers in a small-radius curved bridge jacking method is characterized by comprising a widening section and a heightening section. The widening section includes four I-beams mounted on the upper end of the cap beam, and the heightening section includes a steel column fixedly connected to the four I-beams and a jacking platform fixedly connected to the steel column.

[0008] For structural stability, the structure also includes ring-shaped steel hoops and three-section I-beams. The ring-shaped steel hoops are used to fix the four-section I-beams, and the three-section I-beams are diagonally supported between the four-section I-beams and the piers.

[0009] Furthermore, the four-section I-beams, three-section I-beams, and steel columns are horizontally fixed with 200mm I-beams.

[0010] To ensure overall load-bearing capacity, steel plates are pre-embedded in the pier body and fixed to 172 I-beams and 433 I-beams, and thick rubber pads are installed between the cap beam and the jacking platform.

[0011] To address the eccentric load issue during jacking, tensioning benches, tensioning anchors, and steel strands are also provided. The tensioning benches are mounted on four I-beams, and the tensioning anchors are located at the bottom of the pier. Steel strands connect the tensioning benches and the tensioning anchors, and the tensioning anchors are fixed with steel plates and high-strength bolts.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] A reaction frame for widening and heightening bridge piers during the jacking of small-radius curved bridges is proposed. This is achieved by widening the piers by installing four I-beams on the cap beam, and then heightening them by installing steel columns and a jacking platform on top of the widened 4-I-beams. This solves the problem of insufficient lateral correction space during the jacking construction of small-spacing curved bridges. Furthermore, by installing tensioning benches, tensioning anchors, and steel strands, the problem of different lateral loads on the piers under different working conditions during the jacking process is solved. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0015] Figure 2 This is a side perspective view of the present invention.

[0016] Figure 3 This is a three-dimensional structural diagram of the jacking platform of this utility model.

[0017] Figure 4 This is a three-dimensional structural diagram of the steel column of this utility model.

[0018] Figure 5 This utility model Figure 1 Enlarged cross-sectional view of section A.

[0019] Figure 6 This utility model Figure 1 Enlarged cross-sectional view of section B.

[0020] The markings in the diagram represent: 1. 4-piece I-beam; 2. 3-piece I-beam; 3. Steel strand; 4. Jacking platform; 5. Tensioning anchor fixing end; 6. Steel column; 7. Steel plate; 8. 200 I-beam; 9. Steel hoop; 10. Pier embedded steel plate; 11. 172 I-beam; 12. 433 I-beam; 13. Thick rubber pad; 14. Tensioning bench; 15. High-strength bolt. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, in the description of this utility model, "several" means two or more, unless otherwise explicitly specified.

[0023] Example 1

[0024] Please see Figure 1-6 It includes 4 sets of I-beams, which are installed on the upper end of the cap beam. Specifically, there are 4 sets of I-beams, with a specification of I56a.

[0025] As an example, four I-beams are stacked vertically in pairs on both sides of the cap beam, and fixed with 60cm high, 16mm ring steel hoops. After being tightened with a 10-ton hoist, the ring joints are welded. The height difference caused by the excessive height is leveled with extra pad steel plates.

[0026] Furthermore, the I-beams 1 are fixed laterally with 200 I-beams 8 to form an overall load-bearing structure. The specifications of the 200 I-beams 8 are I20a.

[0027] For structural stability, three I-beams 2 are diagonally supported between the widened section composed of four I-beams 1 and the lateral side of the pier, and are fixedly connected to the four I-beams 1 and the ring steel hoop 9. Optionally, the fixing method is welding or riveting.

[0028] As an example, the specification of the 3-section I-beam is I32a, with 9 ring steel hoops, 60cm high and 16cm in diameter.

[0029] To provide a more robust support and ensure overall load-bearing capacity, the embedded steel plate 10 is placed in the groove on the side of the 3-section I-beam 2, and is fixedly connected to the 4-section I-beam 1 and the cap beam through the 172 I-beam 11 and the 433 I-beam 12.

[0030] Preferably, the embedded steel plate is a 30mm Q355C steel plate, the 172 I-beam 11 has a specification of I17a, and the 433 I-beam has a specification of I43a.

[0031] Similarly, the fixed connection can be either welding or riveting.

[0032] Correspondingly, it also includes a steel column 6, which is fixedly connected to the upper end of the four-section I-beam 1, and a jacking platform 4 is fixedly connected to the upper end of the steel column 6.

[0033] In specific applications, there are 4 steel columns 6, which are set in pairs on the upper part of the 4-section I-beam 1. The diameter of the steel column 6 is 560mm and the height is 1156mm. The diameter of the jacking platform 8 is 560mm and the height is 1156mm.

[0034] To enhance the stability of the platform, the steel column 6 is horizontally fixed with 200 I-beams 8, forming a heightened cap beam.

[0035] A thick rubber pad 13 is installed between the jacking platform 4 and the cap beam to ensure overall stress distribution.

[0036] To address the eccentric load, tensioning benches 14 and tensioning anchor ends 5 are also provided. The tensioning benches 14 are set on both sides of the widened 4-section I-beam 1 and are fixedly connected to the 4-section I-beam 1. As an example, rebar anchoring is used for connection.

[0037] Furthermore, the tensioning anchor end 5 is set at the bottom of the pier and is connected to the pier by steel plate 7 and high-strength bolts 15. A steel strand 3 is connected between the tensioning bench 14 and the tensioning anchor end 5.

[0038] As an embodiment of this utility model, four sets of tensioning benches 14 are provided, symmetrically arranged below the four steel columns. Two sets of tensioning anchor fixing ends 5 are provided, symmetrically arranged on the bottom of the pier. Two sets of steel plates 7 are provided, also symmetrically arranged on the bottom of the pier. Several high-strength bolts are provided, and steel strands 3 are also symmetrically arranged on both sides of the pier.

[0039] Example 2

[0040] In a specific application example, four I-beams are stacked vertically in pairs on both sides of the longitudinal direction of the cap beam. They are fixed with 60cm high, 16mm ring steel hoops and tightened with a 10-ton hoist before welding the ring joint. The height difference caused by the excessive height is leveled with extra pad steel plates. The four-section I-beam 1 is horizontally fixed with 200 I-beam 8, and the three-section I-beam 2 is diagonally supported between the widened section composed of the four-section I-beam 1 and the lateral side of the pier. Finally, the three-section I-beam 2 is further fixed to the pier body embedded steel plate 10 and cap beam by 172 I-beam 11 and 433 I-beam 12. On the basis of widening, the steel column 6 is fixedly connected to the upper end of the four-section I-beam 1, and the jacking platform 4 is fixedly connected to the upper end of the steel column 6. Then, a thick rubber pad 13 is fully laid between the upper end face of the cap beam and the lower end face of the steel column 6 to ensure overall stress. Finally, the tensioning bench 14 is set on both sides of the widened four-section 560 I-beam 1 and fixed by rebar. The tensioning anchor fixing end 5 is set at the bottom of the pier and connected to the pier by steel plate 7 and high-strength bolt 15. The counterweight is adjusted according to the calculation and the actual jacking stroke to offset part of the eccentric force of the reaction frame side box girder.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred embodiments of this utility model and are not intended to limit it. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications shall fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A small-radius curve bridge jacking pier widening and heightening reaction frame, characterized in that, It includes a widening section and a heightening section. The widening section includes a four-section I-beam (1) set on the upper end of the cap beam. The heightening section includes a steel column (6) set on the four-section I-beam (1) and a jacking platform (4) set on the steel column (6).

2. The small-radius curve bridge jacking pier widening and heightening reaction frame according to claim 1, characterized in that, It also includes a ring steel hoop (9) and a 3-section I-beam (2), the ring steel hoop (9) being fixedly connected to a 4-section I-beam (1), and the 3-section I-beam (2) being obliquely supported between the 4-section I-beam (1) and the pier.

3. The reaction frame for widening and heightening the piers of a small-radius curved bridge under jacking as described in claim 2, characterized in that, The four-piece I-beam (1), the three-piece I-beam (2), and the steel column (6) are horizontally fixed by the 200 I-beam (8).

4. The small-radius curve bridge jacking bridge pier widening and heightening reaction frame according to claim 3, characterized in that, The pier body is pre-embedded with steel plates (10) and fixedly connected with 172 I-beams (11) and 433 I-beams (12).

5. The small-radius curve bridge jacking pier widening and heightening reaction frame according to claim 4, characterized in that, It also includes a tensioning bench (14), a tensioning anchor (5) and a steel strand (3). The tensioning bench (14) is set on a 4-section I-beam (1), and the tensioning anchor (5) is set at the bottom of the pier. A steel strand (3) is connected between the tensioning bench (14) and the tensioning anchor (5).

6. The small-radius curve bridge jacking pier widening and heightening reaction frame according to claim 5, characterized in that, The tension anchor fixing end (5) is fixed by a steel plate (7) and a high-strength bolt (15).

7. The small-radius curve bridge jacking bridge pier widening and heightening reaction frame according to claim 6, characterized in that, A thick rubber pad (13) is provided between the cap beam and the jacking platform (4).

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