In-arch concrete pumping and arch springing thrust balancing device for rigid tied-arch bridge

Abstract

A concrete pumping balancing arch foot thrust device in a rigid tied arch bridge comprises a temporary tie bar, an arch seat, a support and a bridge pier, the bridge pier is of a bridge lower structure, the support is installed on the bridge pier, an arch seat of a bridge upper structure is arranged on the support, the arch seats on the two banks of a river are connected with arch ribs, and the backs of the arch seats on the two banks of the river are each provided with an anchoring cross beam in the transverse bridge direction. The anchoring cross beams extend out of the two sides of the back of the skewback, the temporary tie bars are anchored between the two sides of the back of the skewback of the two anchoring cross beams respectively, temporary tie bar hole channels are formed in the anchoring cross beams, the temporary tie bar hole channels are formed in the two ends of the anchoring cross beams, the temporary tie bars penetrate out of the two sides of the skewback, and the positions of the temporary tie bars are higher than those of the rigid tie bars. The balance arch springing thrust device is arranged aiming at huge thrust generated in concrete pumping and rigid tie bar installation procedures in a balance arch, the structure is simple and safe, main construction is detachable and reusable, operation is easy and convenient, and the problem that a temporary tie bar pipeline is arranged in a steel-concrete structure skewback in an extremely small space is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, and particularly relates to a device for balancing the thrust of the arch foot by pumping concrete inside the arch of a rigid tied-arch bridge. Background Technique

[0002] With the development and progress of technology, the spans of various bridge types are getting larger and larger, enabling the construction of roads, municipal projects, and railways in environments such as deep valleys, large rivers, and across the sea. While the high-grade roads are developing, the road network projects are also developing, and most of the bridges on the road network have relatively small spans; for example, the Pinglu Canal built in Guangxi cuts off the original local traffic and requires the construction of many bridges with relatively small spans. Among the bridges with a span of 200m, the rigid tied-arch bridge with bearings has unique advantages in terms of economy, aesthetics, etc.

[0003] However, for the construction method of the rigid tied-arch bridge with bearings, the method of beam first and then arch is mostly adopted, that is, first use brackets to install rigid tie rods and other deck beams, then set up brackets on the beams to install arch ribs, and finally pump concrete in the pipes. But for places with deep rivers or valleys, the bridge height is relatively large, and the economy of installing beams and arches with brackets is poor; at this time, adopting the method of arch first and then beam can speed up the construction progress and reduce the investment in temporary facilities. However, the main problem to be solved by adopting the method of arch first and then beam is to balance the thrust of the arch foot, and certain measures should be taken to balance the thrust generated by the arch foot during the construction process before the rigid tie rod is formed.

[0004] When constructing a rigid tied-arch bridge with bearings by adopting the method of arch first and then beam, basically the arch seat and the bridge pier are temporarily consolidated. This is not applicable to bridges with relatively high piers and limited operating space for the piers. And during the process of pumping concrete, the thrust generated by a single-end and single-side arch foot reaches about 2000t. Adopting the method of temporarily anchoring the arch seat and the bridge pier, it is very difficult to design the consolidation structure within the limited space, which is uneconomical and unsafe, especially for the construction of relatively small arch seats. Therefore, it is necessary to start from aspects such as structural stress, combination of permanent and temporary structures, construction safety, and engineering quality, and design a device for balancing the thrust of the arch foot applicable to the construction of relatively small arch seats and arch ribs. Summary of the Invention

[0005] The purpose of the utility model is to solve the problems existing in the above-mentioned method of arch first and then beam, and start from aspects such as structural stress, combination of permanent and temporary structures, construction safety, and engineering quality, to provide a device for balancing the thrust of the arch foot by pumping concrete inside the arch of a rigid tied-arch bridge, which is applicable to arch seats with relatively small widths.

[0006] The utility model is realized by adopting the following technical solutions:

[0007] A device for balancing the arch springing thrust with pumped concrete inside the arch of a rigid tied-arch bridge, comprising a temporary tie rod, an arch abutment, a bearing and a pier. The pier is the lower structure of the bridge, the bearing is installed on the pier, and the arch abutment of the upper structure of the bridge is on the bearing. The arch abutments on both banks of the river are connected with arch ribs. A fixing cross beam is transversely installed on the back of the arch abutments on both banks of the river respectively. The fixing cross beam extends out of both sides of the back of the arch abutment. A temporary tie rod is fixed between both sides of the back of the two fixing cross beams. A temporary tie rod hole is opened on the fixing cross beam. The temporary tie rod hole is arranged at both ends of the fixing cross beam, so that the temporary tie rod passes through both sides of the arch abutment, and the position of the temporary tie rod is higher than that of the rigid tie rod. Before the rigid tie rod is installed, the temporary tie rod resists the arch springing thrust generated by the pumped concrete in the pipe and the installation of the deck beam, ensuring that the arch abutment does not slide. After the rigid tie rod is installed, the temporary tie rod can be removed.

[0008] Further preferably: A support backing plate is arranged between the fixing cross beam and the arch abutment, and the acting force is transmitted to the arch abutment through the support backing plate.

[0009] Further preferably: A support rod is connected and arranged at the top end of the support backing plate. One end of the support rod is welded to the support backing plate, and the other end of the support rod is welded to the steel plate on the inclined surface of the back of the arch abutment, ensuring that the support backing plate is in a vertical state and meets the support strength.

[0010] Further preferably: The fixing cross beam is of a box structure, which is welded and assembled by a top plate, a bottom plate and side plates. Horizontal stiffening plates and vertical stiffening plates are welded and arranged inside the fixing cross beam. The transverse side plate serves as the tensioning anchor backing plate of the temporary tie rod, and the height of the side plate is determined according to the size of the jack. The length of the box structure should also be set according to the magnitude of the force.

[0011] Further preferably: The horizontal stiffening plates are arranged throughout the length, covering the transverse width of the arch abutment.

[0012] Further preferably: A displacement sensor is installed at the bottom of the arch abutment. During the process of pumping concrete in the arch rib pipe and installing the rigid tie rod, according to the data fed back by the displacement sensor at the bottom of the arch abutment and the anchor under-pressure sensor of the temporary tie rod, the tension of the temporary tie rod is adjusted to maintain the plane position of the arch abutment.

[0013] The advantages of this device for balancing the arch springing thrust with pumped concrete inside the arch of a rigid tied-arch bridge are as follows:

[0014] 1. The device for balancing the thrust of the arch foot by pumping concrete inside the arch of this rigid tied-arch bridge is mainly set to balance the huge thrust generated during the processes of pumping concrete inside the arch and installing the rigid tie rods, achieving a simple and safe structure. The main components can be disassembled and reused, with simple operation and stable control achievable. By controlling the displacement of the arch seat through temporary tie rods, the process operation is simple. Only the state of the arch seat needs to be monitored, and the state adjustment of the arch seat is completed through automatic tensioning. The process does not require human interference, reducing the risk of structural failure and construction safety risks caused by manual participation in the locking and switching of the arch seat.

[0015] 2. An anchor crossbeam for the temporary tie rod is arranged on the back of the arch seat, solving the difficulty of setting the temporary tie rod pipeline in the steel-concrete structure arch seat with extremely limited space.

[0016] 3. The anchor crossbeam is provided with support rods and a continuous horizontal stiffening plate, greatly improving the bearing capacity of the anchor crossbeam and reducing the material consumption of the anchor crossbeam.

[0017] 4. By setting the support pads of the anchor crossbeam, it can well adapt to the planar shape of the back of the arch seat, providing the connection conditions between the anchor crossbeam and the arch seat and increasing the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the layout schematic diagram of the device for balancing the thrust of the arch foot by pumping concrete inside the arch of this rigid tied-arch bridge;

[0019] Figure 2 is the schematic diagram of the connection relationship between the temporary tie rod and the arch seat;

[0020] Figure 3 is the schematic diagram of the connection structure of the anchor crossbeam;

[0021] Figure 4 is Figure 3 the left view schematic diagram of the anchor crossbeam in

[0022] The names corresponding to the numbers in the figure are:

[0023] 1. Anchor crossbeam; 2. Temporary tie rod; 3. Arch seat; 4. Arch rib; 5. Support; 6. Pier; 7. Rigid tie rod; 8. Displacement sensor; 11. Support pad; 12. Support rod; 13. Temporary tie rod duct; 14. Top plate; 15. Bottom plate; 16. Side plate; 17. Horizontal stiffening plate; 18. Vertical stiffening plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, in combination with the embodiments, the technical solutions in the invention will be clearly and completely described. The described embodiments are only a part of the present utility model, rather than all of the embodiments. Embodiment

[0025] As Figures 1-4As shown in the figure, a device for balancing the thrust at the arch feet by pumping concrete inside the arch of a rigid tie arch bridge includes a temporary tie rod 2, an arch abutment 3, a bearing 5 and a pier 6. The pier 6 is the lower structure of the bridge. A bearing 5 is installed on the pier 6, and the arch abutment 3 of the upper structure of the bridge is located on the bearing 5. The arch ribs 4 are connected to the arch abutments 3 on both banks of the river. An anchoring cross beam 1 is horizontally installed on the back of the arch abutments 3 on both banks of the river. The anchoring cross beam 1 extends out of both sides of the back of the arch abutment 3. A temporary tie rod 2 is anchored between the two sides of the back of the arch abutment 3 of the two anchoring cross beams 1. A temporary tie rod hole 13 is provided on the anchoring cross beam 1, and the temporary tie rod hole 13 is arranged at both ends of the anchoring cross beam 1, so that the temporary tie rod 2 passes through both sides of the arch abutment 3, and the position of the temporary tie rod 2 is higher than that of the rigid tie rod 7. After the rigid tie rod 7 is installed, the temporary tie rod 2 can be removed.

[0026] A support backing plate 11 is arranged between the anchoring cross beam 1 and the arch abutment 3. A support rod 12 is connected to the top end of the support backing plate 11. One end of the support rod 12 is welded to the support backing plate 11, and the other end of the support rod 12 is welded to the steel plate on the inclined surface of the back of the arch abutment 3 to ensure that the support backing plate 11 is in a vertical state and meets the support strength.

[0027] The anchoring cross beam 1 is of a box structure and is assembled by welding the top plate 14, the bottom plate 15 and the side plates 16. Horizontal stiffening plates 17 and vertical stiffening plates 18 are welded inside the anchoring cross beam 1. The horizontal stiffening plates 17 are arranged throughout the length and cover the transverse width of the arch abutment 3.

[0028] A displacement sensor 8 is installed at the bottom of the arch abutment 3. During the process of pumping concrete inside the arch rib 4 tube and installing the rigid tie rod, according to the data fed back by the displacement sensor 8 at the bottom of the arch abutment 3 and the anchor-down pressure sensor of the temporary tie rod 2, the tension of the temporary tie rod 2 is adjusted to keep the plane position of the arch abutment 3.

[0029] The above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by those of ordinary skill in the art within the essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A device for balancing the arch springing thrust by pumping concrete inside the arch of a rigid tied-arch bridge, comprising a temporary tie rod (2), an arch abutment (3), a bearing (5) and a bridge pier (6). The bridge pier (6) is the lower structure of the bridge. A bearing (5) is installed on the bridge pier (6), and the arch abutment (3) of the upper structure of the bridge is located above the bearing (5). Arch ribs (4) are connected to the arch abutments (3) on both banks of the river. It is characterized in that: On the back parts of the abutments (3) on both banks of the river, an anchoring cross beam (1) is installed transversely to the bridge. The anchoring cross beam (1) extends out of both sides of the back of the abutment (3). A temporary tie rod (2) is anchored between both sides of the back of the two anchoring cross beams (1) and the abutment (3). Temporary tie rod holes (13) are formed in the anchoring cross beam (1). The temporary tie rod holes (13) are arranged at both ends of the anchoring cross beam (1), so that the temporary tie rod (2) passes through from both sides of the abutment (3), and the position of the temporary tie rod (2) is higher than that of the rigid tie rod (7).

2. The rigid tie-arch bridge arch internal pumped concrete balance arch-foot thrust device according to claim 1, characterized in that: A support backing plate (11) is arranged between the anchoring cross beam (1) and the abutment (3).

3. The balanced arch springing thrust device of pumped concrete inside the arch of a rigid tie-arch bridge according to claim 2, characterized in that: A support rod (12) is connected and arranged at the top end of the support backing plate (11). One end of the support rod (12) is welded to the support backing plate (11), and the other end of the support rod (12) is welded to the steel plate on the inclined surface of the back of the abutment (3).

4. The rigid tie-bar arch bridge arch internal pumped concrete balance arch-foot thrust device according to claim 1 or 2, characterized in that: The anchoring cross beam (1) is of a box structure and is assembled by welding the top plate (14), the bottom plate (15) and the side plates (16). Horizontal stiffening plates (17) and vertical stiffening plates (18) are welded and arranged inside the anchoring cross beam (1).

5. The rigid tie-arch bridge arch internal pumped concrete balance arch-foot thrust device according to claim 4, characterized in that: The horizontal stiffening plates (17) are arranged in the whole length and cover the transverse width of the abutment (3).

6. The device for balancing the arch springing thrust by pumping concrete inside the arch of the rigid tied-arch bridge according to claim 1, wherein: A displacement sensor (8) is installed at the bottom of the abutment (3).

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