Ejector rod limiting truss of through arch bridge weak pier arch rib self-balancing buckling and hanging system

Abstract

The utility model discloses an ejector rod limiting truss of a through arch bridge weak pier arch rib self-balancing buckling system, which comprises a top pressing beam, two parallel bottom bearing beams are arranged below the top pressing beam, the top pressing beam and the two bottom bearing beams are fixedly connected together through connecting rods, and the two bottom bearing beams are fixedly connected together through connecting rods. The ejector rod limiting truss is divided into a plurality of penetrating cavities through the connecting rods, and a plurality of prestressed steel beam penetrating holes are formed in the top pressing beam. A plurality of penetrating cavities are formed in the ejector rod limiting truss, the ejector rods penetrate through the penetrating cavities and are limited by the ejector rod limiting truss, the ejector rod limiting truss is fixed to the approach bridge through the prestressed steel beams, and therefore the ejector rods are prevented from floating upwards and floating up under the pulling force effect of the back cable, fixing of the ejector rods in the vertical direction is achieved, and the service life of the ejector rods is prolonged. And the back cable is pulled by the ejector rod, so that the structural stability of the whole through arch bridge weak pier arch rib self-balancing buckling and hanging system is ensured.

Description

Technical Field

[0001] This utility model relates to a top rod limiting truss of a self-balancing fastening system for the weak pier arch ribs of 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 novel solution: securing the backstay cable to a top rod fixed to the approach bridge. This structure eliminates the need for gravity anchors, achieving backstay cable anchorage without damaging the land on the approach bridge side. Throughout the structure, the top rod should prevent upward floating under the tension of the backstay cable, and its deformation along its length should be unrestricted. However, determining the optimal structure for securing the top rod is a key technical challenge that this solution must address. Summary of the Invention

[0004] The purpose of this invention is to provide a top rod limiting truss for a self-balancing fastening system of weak pier arch ribs in a through-arch bridge. This structure can effectively fix the top rod to the bridge deck.

[0005] The technical solution of this utility model is as follows: A top rod limiting truss for a self-balancing fastening system of weak pier arch ribs of a lower-bearing arch bridge includes a top pressure beam, two parallel bottom pad beams are provided below the top pressure beam, the top pressure beam and the two bottom pad beams are fixedly connected together by connecting rods, the connecting rods divide the top rod limiting truss into multiple insertion cavities, and the top pressure beam is provided with multiple prestressed steel strand insertion holes.

[0006] In the aforementioned self-balancing fastening system for the weak pier arch rib of a lower-bearing arch bridge, the top rod limiting truss is provided with PTFE gaskets on the top pressure beam, bottom pad beam, and connecting rod at the cavity.

[0007] In the aforementioned self-balancing buckling system for the weak pier arch rib of a lower-bearing arch bridge, the top pressure beam and the bottom pad beam, as well as the two bottom pad beams, are fixedly connected together by diagonal reinforcing bars.

[0008] In the aforementioned self-balancing fastening system for the weak pier arch rib of a lower-bearing arch bridge, multiple insertion cavities are spaced apart, and prestressed steel strand insertion holes are provided on the top pressure beams on both sides of each insertion cavity.

[0009] In the aforementioned self-balancing buckling system for the weak pier arch rib of a lower-bearing arch bridge, the top pressure beam is located directly above the middle of the two bottom pad beams, and the side of the top pressure beam forms an isosceles triangle structure.

[0010] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model uses a top pressure beam, a bottom pad beam, a connecting rod, a prestressed steel strand insertion hole, a PTFE gasket, and an oblique reinforcing rod to form a top rod limiting truss. This top rod limiting truss forms multiple insertion cavities. The top rod passes through the insertion cavities and is limited in the vertical direction by the top rod limiting truss. The top rod limiting truss is fixed to the approach bridge by prestressed steel strands, thereby preventing the top rod from floating upward under the tension of the back cable. This achieves the fixation of the top rod in the vertical direction. Furthermore, by pulling the back cable with the top rod, the structural stability of the entire under-bearing arch bridge weak pier arch rib self-balancing fastening system is ensured. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 for Figure 1 A top-view structural diagram;

[0013] Figure 3 for Figure 1 A schematic diagram of the AA-direction structure;

[0014] Figure 4 for Figure 1 A schematic diagram of the side structure;

[0015] Figure 5 This is a schematic diagram of the structure of this utility model when a top rod is inserted.

[0016] Reference numerals: 1-Top pressure beam, 2-Bottom pad beam, 3-Connecting rod, 4-Prestressed steel strand insertion hole, 5-PTFE gasket, 6-Angled reinforcing rod, 7-Top rod. Detailed Implementation

[0017] 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.

[0018] An embodiment of this utility model: The design concept of a self-balancing fastening system for the weak pier arch rib of a lower-bearing arch bridge is as follows: A top rod 7 is set along the length of the approach bridge. The top rod 7 is inserted into the top rod limiting truss of this utility model. The top rod limiting truss is fixed on the T-beam and the cap beam of the approach bridge. Since the top rod 7 is limited in the vertical direction by the top rod limiting truss, it is prevented from floating upward under the tension of the back cable. In the length direction, a top rod end limiting device is set only at the end of the top rod 7 to limit it. The deformation of the top rod 7 in the length direction is not constrained by the top rod limiting truss. The horizontal component of the tension of the back cable is ultimately directly applied to the top rod end limiting device at its head end through the top rod 7. The top rod end limiting device resists its thrust in the direction of the main bridge. Since the deformation of the top rod 7 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 through the component, thus avoiding damage to the pier under the action of a large thrust.

[0019] Based on this, the top rod limiting truss structure of the self-balancing buckling system of the weak pier arch rib of the under-bearing arch bridge that we designed is as follows: It includes a top pressure beam 1, and two parallel bottom pad beams 2 are set below the top pressure beam 1. During use, the bottom pad beams 2 are supported on the approach bridge T-beam. The top pressure beam 1 and the two bottom pad beams 2 are fixedly connected together by connecting rods 3, so that the side of the top rod limiting truss forms a triangular structure. The connecting rods 3 divide the top rod limiting truss into three insertion cavities. Each insertion cavity corresponds to the insertion of one top rod 7. The top rod 7 passes through the insertion cavity. The bottom of the top rod 7 is supported on the bottom pad beam 2, and the top is pressed down by the top pressure beam 1, thereby realizing the vertical limiting of the top rod 7. The top pressure beam 1 is provided with multiple prestressed steel strand insertion holes 4. The prestressed steel strands pass vertically through the reserved vertical holes and the prestressed steel strand insertion holes 4 in the approach bridge T-beam and are then anchored on the top rod limiting truss. This structure achieves a fixed connection between the top rod limiting truss and the approach bridge cap beam and approach bridge T-beam.

[0020] The top pressure beam 1, bottom pad beam 2, and connecting rod 3 at the insertion cavity are equipped with PTFE gaskets 5. During use, the PTFE gaskets 5 contact the outer wall of the top rod 7. Due to the tension of the back cable, the top rod 7 will deform in the direction of the main bridge. This deformation will cause a slight displacement of the top rod 7. The PTFE gaskets 5 are provided to prevent the top rod from directly contacting the top pressure beam 1, bottom pad beam 2, and connecting rod 3, firstly to prevent wear, and secondly to prevent excessive friction between them, which would affect the displacement of the top rod 7 in the direction of the main bridge.

[0021] The top pressure beam 1 and the bottom pad beam 2, as well as the two bottom pad beams 2, are fixedly connected together by diagonal reinforcing rods 6 to improve the overall strength of the top rod limiting truss and prevent the top rod limiting truss from deforming under the upward squeezing force of the top rod 7.

[0022] Multiple insertion cavities are spaced apart, and each insertion cavity has a prestressed steel strand insertion hole 4 on the top pressure beam 1 on both sides. The three insertion cavities are equipped with six prestressed steel strand insertion holes 4, so that the top rod limiting truss is firmly fixed at each position.

[0023] The top pressure beam 1 is located directly above the middle of the two bottom pad beams 2. The top rod limiting truss forms an isosceles triangle structure on its side, which can be more stably fixed under the tension of the prestressed steel strands.

Claims

1. A top-mounted limiting truss for a self-balancing fastening system of weak pier arch ribs in a through-arch bridge, characterized in that: It includes a top pressure beam (1), and two parallel bottom pad beams (2) are provided below the top pressure beam (1). The top pressure beam (1) and the two bottom pad beams (2) are fixedly connected together by a connecting rod (3). The connecting rod (3) divides the top rod limiting truss into multiple insertion cavities. The top pressure beam (1) is provided with multiple prestressed steel strand insertion holes (4).

2. The top rod limiting truss of the self-balancing fastening system for the weak pier arch rib of a deck arch bridge according to claim 1, characterized in that: The top pressure beam (1), bottom pad beam (2), and connecting rod (3) at the insertion cavity are provided with PTFE gaskets (5).

3. The top rod limiting truss of the self-balancing fastening system for weak pier arch ribs of a deck arch bridge according to claim 1, characterized in that: The top pressure beam (1) and the bottom pad beam (2), as well as the two bottom pad beams (2), are fixedly connected together by diagonal reinforcing rods (6).

4. The top rod limiting truss of the self-balancing fastening system for the weak pier arch rib of a deck arch bridge according to claim 1, characterized in that: Multiple insertion cavities are spaced apart, and each insertion cavity has a prestressed steel strand insertion hole (4) on the top pressure beam (1) on both sides.

5. The top rod limiting truss of the self-balancing fastening system for weak pier arch ribs of a deck arch bridge according to claim 1, characterized in that: The top pressure beam (1) is located directly above the middle of the two bottom pad beams (2), and the side of the top rod limiting truss forms an isosceles triangle structure.

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