Ejector rod structure of through arch bridge weak pier arch rib self-balancing buckling system

Abstract

The utility model discloses an ejector rod structure of a through arch bridge weak pier arch rib self-balancing buckling system, which comprises a plurality of mutually connected steel pipe ejector rods, a steel box ejector rod with a square cross section is further connected between part of adjacent steel pipe ejector rods, the top surface of the steel box ejector rod is provided with a plurality of openings which are arranged in parallel at intervals, and the steel box ejector rod and the steel box ejector rod are mutually connected. Pin shaft penetrating grooves are formed in the front side and the rear side of the steel box ejector rod. The ejector rod structure is composed of the steel pipe ejector rod and the steel box ejector rod, the steel box ejector rod is provided with the opening and the pin shaft penetrating groove so that a back cable anchor box can be conveniently installed, connection of a back cable and the ejector rod is achieved, the steel box ejector rod penetrates into the ejector rod limiting truss, vertical limiting and fixing of the ejector rod can be achieved, and the steel box ejector rod is convenient to install. And the condition that the ejector rod structure floats upwards under the tension action of the back cable is avoided. The ejector rod structure is combined with other components, so that the structural stability of the whole through arch bridge weak pier arch rib self-balancing buckling and hanging system is guaranteed.

Description

Technical Field

[0001] This utility model relates to a top rod structure of a self-balancing fastening system for the arch ribs of a weak pier in a deck arch bridge, belonging to the field of bridge structure technology. Background Technology

[0002] During the construction of a through-arch bridge, when the area it crosses (such as a water source, a historical and cultural protection area, or a waterway) is not suitable for erecting scaffolding to push the arch frame upwards, a pylon structure is required. The arch rib segments are stabilized by a fastening system connected to the pylon structure. To ensure the pylon structure is vertical, backstays are also needed. The upper end of the backstay is anchored to the pylon, and the lower end is anchored to anchorages. When building bridges in mountainous areas, the lower end of the backstay can be anchored to the rock mass using an anchor cable structure. When building such bridges in plains areas, gravity anchorages must be installed on the ground on both banks of the approach bridge to secure the backstay. However, when the ground on the approach bridge side is a soft soil structure (such as silty soil layer) and the area around the bridge site is a large area of ​​basic farmland, it is necessary to "excavate and build a lot" to install temporary gravity anchors. This not only increases the amount of work, but also causes a lot of damage to the farmland. In this case, what kind of structure to adopt to achieve backstay fixation while avoiding damage to the farmland has become a technical problem that the industry urgently needs to solve.

[0003] To address this situation, we have proposed a new solution: fixing the backstay cable to a top rod fixed on the approach bridge. This structure eliminates the need for gravity anchors, achieving backstay cable anchorage without damaging the land on the approach bridge side. However, the key technical challenge of designing this top rod to effectively secure the backstay cable remains to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a top rod structure for a self-balancing anchoring system of weak pier arch ribs in a through-arch bridge. This top rod structure can fix the back cable, eliminating the need for gravity anchors.

[0005] The technical solution of this utility model is as follows: the top rod structure of the self-balancing buckle system of the weak pier arch rib of the under-bearing arch bridge includes multiple interconnected steel pipe top rods, among which some adjacent steel pipe top rods are also connected by steel box top rods with a square cross section. The top surface of the steel box top rod is provided with multiple spaced and parallel openings, and the front and rear sides of the steel box top rod are provided with pin insertion grooves.

[0006] In the aforementioned self-balancing buckle system for the weak pier arch rib of the under-bearing arch bridge, the steel pipe top rod includes a circular steel pipe with flanges fixed at both ends, and multiple bolt holes are evenly distributed on the flanges.

[0007] In the aforementioned self-balancing buckle system for the weak pier arch ribs of the under-bearing arch bridge, the back of the flange is fixedly connected to the circular steel pipe via multiple stiffening ribs.

[0008] In the aforementioned self-balancing buckle system for the weak pier arch rib of the under-bearing arch bridge, the top rod of the steel box includes a steel box top plate and a steel box bottom plate arranged in parallel. Two steel box side plates and one steel box middle plate are arranged between the steel box top plate and the steel box bottom plate. Circular steel plates are fixedly connected to both ends of the steel box top plate and the steel box bottom plate. Multiple bolt holes are evenly distributed on the circular steel plates. Multiple spaced and parallel openings are provided on the steel box top plate. Pin insertion grooves are provided on the two steel box side plates and the one steel box middle plate.

[0009] In the aforementioned self-balancing buckle system for the weak pier arch ribs of the under-bearing arch bridge, the back of the circular steel plate is fixedly connected to the top rod of the steel box via multiple stiffening plates.

[0010] In the aforementioned self-balancing buckle system for the weak pier arch ribs of the under-bearing arch bridge, the top plate, bottom plate, and side plate of the steel box top rod are also connected to reinforcing steel plates; the opening and pin insertion groove are located at the middle position of the steel box top rod.

[0011] The beneficial effects of this utility model are as follows: Compared with the prior art, the top rod structure of this utility model consists of a steel pipe top rod and a steel box top rod. The steel box top rod has openings and pin insertion slots for easy installation of the back cable anchor box, thus achieving the connection between the back cable and the top rod. The steel box top rod is inserted into the top rod limiting truss, achieving vertical limiting and fixing of the top rod and preventing the top rod structure from floating upwards under the tension of the back cable. This top rod structure, combined with other components, ensures the structural stability of the entire self-balancing anchoring system for the weak pier arch ribs of the under-bearing arch bridge. By using the top rod, there is no need to construct gravity anchors, avoiding the construction of large-scale temporary facilities and reducing the occupation of arable land and resource waste. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the steel pipe top rod structure;

[0014] Figure 3 for Figure 2 A schematic diagram of the AA-direction structure;

[0015] Figure 4 This is a structural schematic diagram of the steel box top rod;

[0016] Figure 5 for Figure 4 A top-view structural diagram;

[0017] Figure 6 for Figure 4 Schematic diagram of the BB-oriented structure;

[0018] Figure 7 for Figure 4 A schematic diagram of the CC-direction structure;

[0019] Figure 8 This is a schematic diagram of the structure in which the top rod passes through the top rod limiting truss.

[0020] Reference numerals: 1-Steel pipe top rod, 2-Steel box top rod, 3-Opening, 4-Pin shaft insertion groove, 5-Circular steel pipe, 6-Flange, 7-Bolt hole, 8-Stiffening rib, 9-Steel box top plate, 10-Steel box bottom plate, 11-Steel box side plate, 12-Steel box middle plate, 13-Circular steel plate, 14-Stiffening plate, 15-Reinforcing steel plate, 16-Top rod limiting truss. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0022] An embodiment of this utility model: The top rod structure of the self-balancing buckle system of the weak pier arch rib of the under-bearing arch bridge includes multiple interconnected steel pipe top rods 1, among which some adjacent steel pipe top rods 1 are also connected by steel box top rods 2 with a square cross section. The top surface of the steel box top rod 2 is provided with multiple spaced and parallel openings 3, and the front and rear sides of the steel box top rod 2 are provided with pin insertion grooves 4.

[0023] In use, this utility model features a top rod structure along the length of the approach bridge. The steel box top rod 2 of the top rod structure is inserted into the top rod limiting truss 16, which is fixed to the approach bridge T-beam and the approach bridge cap beam. Because the top rod structure is vertically limited by the top rod limiting truss 16, it is prevented from floating upwards under the tension of the backstay. In the length direction, only the top rod end limiting device is installed at the end of the top rod structure to limit its movement. If the deformation in the length direction is not constrained by any component, the horizontal component of the tension of the backstay will ultimately act directly on the end-limiting device of the top rod structure through the top rod structure. The end-limiting device of the top rod will resist the thrust in the direction of the main bridge. Since the deformation of the top rod structure in the length direction is not constrained by any component, its thrust in the direction of the main bridge will not be transmitted to the approach bridge T-beam, approach bridge cap beam and the pier below the approach bridge cap beam 4 through the component, thus avoiding damage to the pier under the action of a large thrust.

[0024] The steel box top rod 2 is set at the position of the top rod limiting truss 16. In order to fix the top rod structure, multiple top rod limiting trusses 16 are generally required. Correspondingly, multiple steel box top rods 2 are also required in the overall top rod structure. Specifically, the steel box top rod 2 is inserted through the square insertion hole of the top rod limiting truss 16. The reason for setting the steel box top rod 2 with a square cross-section is to ensure that the contact between the top rod limiting truss 16 and the steel box top rod 2 is a surface-to-surface contact, so that the top rod limiting truss 16 can better restrict the entire top rod structure.

[0025] The opening 3 and pin insertion groove 4 on the top rod 2 of the steel box are for the convenience of installing the backstay anchor box. The backstay anchor box is used to connect the lower anchoring point of the backstay. During installation, the connecting plate of the backstay anchor box extends from the opening 3 into the top rod 2 of the steel box, and then the pin is inserted through the pin insertion groove 4. The pin passes through the pin hole on the connecting plate of the backstay anchor box, thus fixing the backstay anchor box to the top rod 2 of the steel box, which facilitates the subsequent installation of the backstay. The reason for setting the opening 3 and pin insertion groove 4 on the top rod 2 of the steel box is that the top rod limiting truss 16 is set at the top rod 2 to press it down, and this place can best withstand the tension of the backstay.

[0026] The steel pipe top rod 1 includes a circular steel pipe 5, with flanges 6 fixedly installed at both ends of the circular steel pipe 5. Multiple bolt holes 7 are evenly distributed on the flanges 6. This structure facilitates the connection between two adjacent sections of circular steel pipe 5.

[0027] The flange 6 is fixedly connected to the circular steel pipe 5 via multiple stiffening ribs 8 on its back, thereby strengthening the connection between the flange 6 and the circular steel pipe 5.

[0028] The steel box top rod 2 includes a steel box top plate 9 and a steel box bottom plate 10 arranged in parallel. Two steel box side plates 11 and one steel box middle plate 12 are arranged between the steel box top plate 9 and the steel box bottom plate 10. This structure can improve the structural strength of the entire steel box top rod 2. Circular steel plates 13 are fixedly connected to both ends of the steel box top plate 9 and the steel box bottom plate 10 respectively. Multiple bolt holes 7 are evenly distributed on the circular steel plates 13. During use, the steel box top rod 2 and the steel pipe top rod 1 are fixed together by passing bolts through the bolt holes 7 on the circular steel plates 13 and the flange 6 of the steel pipe top rod 1. The steel box top plate 9 is provided with multiple spaced and parallel openings 3. The two steel box side plates 11 and the one steel box middle plate 12 are provided with pin insertion grooves 4.

[0029] The circular steel plate 13 is fixedly connected to the steel box top rod 2 via multiple stiffening plates 14 on its back, thereby strengthening the connection between the circular steel plate 13 and the steel box top rod 2.

[0030] Reinforcing steel plates 15 are also connected to the top plate 9, bottom plate 10, and side plate 11 of the steel box top rod 2 in the middle section; the opening 3 and the pin insertion groove 4 are set at the middle position of the steel box top rod 2. Since the middle section of the steel box top rod 2 needs to be connected to the backing anchor box and needs to withstand a large tensile force, a reinforcing steel plate 15 is also provided in the middle section of the steel box top rod 2 to improve its tensile strength.

Claims

1. The top rod structure of the self-balancing fastening system for the weak pier arch rib of a through-arch bridge, characterized in that: It includes multiple interconnected steel pipe top rods (1), among which some adjacent steel pipe top rods (1) are also connected by steel box top rods (2) with a square cross section. The top surface of the steel box top rod (2) is provided with multiple spaced and parallel openings (3), and the front and rear sides of the steel box top rod (2) are provided with pin insertion grooves (4).

2. The top rod structure of the self-balancing fastening system for the weak pier arch rib of the under-deck arch bridge according to claim 1, characterized in that: The steel pipe top rod (1) includes a circular steel pipe (5), and flanges (6) are fixedly installed at both ends of the circular steel pipe (5). Multiple bolt holes (7) are evenly distributed on the flanges (6).

3. The top rod structure of the self-balancing fastening system for the weak pier arch rib of the under-deck arch bridge according to claim 2, characterized in that: The flange (6) is fixedly connected to the circular steel pipe (5) on the back by multiple stiffening ribs (8).

4. The top rod structure of the self-balancing fastening system for the weak pier arch rib of the under-bearing arch bridge according to claim 1, characterized in that: The steel box top rod (2) includes a steel box top plate (9) and a steel box bottom plate (10) arranged in parallel. Two steel box side plates (11) and one steel box middle plate (12) are arranged between the steel box top plate (9) and the steel box bottom plate (10). Circular steel plates (13) are fixedly connected to both ends of the steel box top plate (9) and the steel box bottom plate (10). Multiple bolt holes (7) are evenly distributed on the circular steel plates (13). Multiple spaced and parallel openings (3) are provided on the steel box top plate (9). Pin insertion grooves (4) are provided on the two steel box side plates (11) and the one steel box middle plate (12).

5. The top rod structure of the self-balancing fastening system for the weak pier arch rib of the under-deck arch bridge according to claim 4, characterized in that: The circular steel plate (13) is fixedly connected to the top rod (2) of the steel box via multiple stiffening plates (14) on its back.

6. The top rod structure of the self-balancing fastening system for the weak pier arch rib of the under-deck arch bridge according to claim 4, characterized in that: A reinforcing steel plate (15) is also connected to the steel box top plate (9), steel box bottom plate (10) and steel box side plate (11) in the middle of the steel box top rod (2); the opening (3) and the pin insertion groove (4) are set at the middle position of the steel box top rod (2).

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