Reinforcing structure of arch bridge span and construction method thereof

Abstract

The application discloses a reinforcing structure of an arch bridge span and a construction method thereof, and belongs to the technical field of bridge structures. The reinforcing structure comprises an arch-shaped reinforcing part which is attached to an inner arch of the arch bridge, and a plurality of penetrating reinforcing parts are arranged on one side of the attached surface of the arch-shaped reinforcing part and the inner arch of the arch bridge, and the penetrating reinforcing parts penetrate the inner part of the arch bridge. A sling mechanism comprises four diagonal support seats arranged on the arch bridge and a plurality of anchor cables. One end of each anchor cable is anchored to a corresponding support seat, and the other end of each anchor cable penetrates a corresponding penetrating reinforcing part and is anchored to the arch-shaped reinforcing part. The arch-shaped reinforcing part is used as a supporting part of the inner arch of the arch bridge, the supporting effect of the arch-shaped reinforcing part is enhanced by the sling mechanism, and the overall bearing capacity of the arch bridge is enhanced. The penetrating reinforcing parts penetrate the arch bridge and are arranged in the inner part of the arch bridge, and are used as the inner framework of the arch bridge and limit the parts of the arch bridge. The arch bridge is integrated into a whole by the arch-shaped reinforcing part and the penetrating reinforcing part, and the overall anti-seismic capacity of the arch bridge is improved.

Description

Technical Field

[0001] This invention belongs to the field of bridge structure technology, specifically a reinforcement structure for an arch bridge span and its construction method. Background Technology

[0002] Arch bridges are a widely used structure in the field of bridge construction, currently primarily consisting of masonry arch bridges, concrete arch bridges, or steel arch bridges. Arch bridges utilize their unique arched structure to transfer the superstructure load to the abutments at both ends in the form of horizontal thrust, which is then supported by the ground. Therefore, the arch axis has a significant impact on the stress on the arch bridge. The longer the span, the greater the deviation of the arch axis from the dead load line due to spatial constraints, resulting in a weaker load-bearing capacity for the arch bridge.

[0003] Older arch bridges are mostly masonry or concrete arch bridges, and my country has a large number of these. As these bridges age, their repair and reinforcement have become a major challenge. Currently, bonding fiber-reinforced polymers to the inner arch is a common method for arch bridge repair. However, the fiber-reinforced polymers are prone to detachment at cracks or shear deformation points in the inner arch, resulting in unreliable reinforcement. Furthermore, both masonry and concrete arch bridges have relatively weak seismic resistance, and these issues must be considered during repair and reinforcement. Summary of the Invention

[0004] The purpose of this invention is to provide a reinforcement structure for arch bridge spans and a construction method thereof, so as to solve the problems mentioned in the background art.

[0005] A reinforcement structure for an arch bridge span is provided, comprising:

[0006] An arch-shaped reinforcing member that fits into the inner arch of the arch bridge, wherein the two ends of the arch-shaped reinforcing member abut against the base at both ends of the arch bridge, and a plurality of penetrating reinforcing members are provided on the side of the arch-shaped reinforcing member that fits into the inner arch of the arch bridge, wherein the penetrating reinforcing members penetrate into the interior of the arch bridge.

[0007] The suspension mechanism includes support seats located at the four opposite corners of the arch bridge and several anchor cables. One end of each anchor cable is anchored to the corresponding support seat, and the other end of each anchor cable passes through the corresponding penetrating reinforcement and is anchored to the arch-shaped reinforcement.

[0008] As a further aspect of the present invention: the arch-shaped reinforcing member includes a plurality of arc-shaped members arranged along the width direction of the inner arch of the arch bridge and a plurality of reinforcing ribs arranged between the plurality of arc-shaped members, and the anchor cable is anchored to the corresponding arc-shaped member.

[0009] Since the main supporting force of the arched reinforcement is provided by the support seats and anchor cables of the cable-stayed mechanism, the curved members have advantages over using traditional corrugated steel as the supporting components of the inner arch, such as lighter weight, simpler processing and forming, and lower cost. At least two curved members are arranged in the width direction of the inner arch of the arch bridge, and at least one is arranged on each side of the arch bridge. These members are positioned opposite the support seats for anchor cable fixation, playing a primary supporting role. The curved members in the middle position not only provide auxiliary support but also increase the density of penetrating reinforcements in the width direction of the arch bridge, thus enhancing both the supporting effect and the seismic resistance.

[0010] The reinforcing ribs between the curved members connect multiple curved members into a whole, transmitting lateral forces and enhancing the lateral stability of the arch bridge. Anchor cables are anchored to the curved members through corresponding through-reinforcing members, ensuring a straight force transmission path.

[0011] As a further aspect of the present invention, the reinforcing structure further includes several lateral reinforcing members, which penetrate the interior of the arch bridge along the side of the arch bridge, and the end of the penetrating reinforcing member away from the arch-shaped reinforcing member penetrates the corresponding lateral reinforcing member.

[0012] Without lateral stiffeners, multiple penetrating stiffeners function as independent mechanisms. When the lateral forces of an arch bridge are transmitted to the penetrating stiffeners, a single penetrating stiffener resembles a cantilever beam structure, transferring the bending moment to the curved members, which then bear the force. In this case, the bending moment transmitted by the penetrating stiffener is very large, and the connection between the penetrating stiffener and the curved member is highly susceptible to damage. Therefore, using lateral stiffeners to connect multiple penetrating stiffeners in the same width direction, integrating them into a single unit, balances the bending moments at both ends of the penetrating stiffener, and significantly improves its load-bearing capacity.

[0013] Since both the penetrating stiffeners and lateral stiffeners are located inside the arch bridge, it is difficult to fix them to the outside using bolts or welding. Therefore, perforations are pre-drilled in the lateral stiffeners, which are then inserted into the sidewalls of the arch bridge. The penetrating stiffeners are then inserted into the pre-drilled perforations in the lateral stiffeners for fixation. After reinforcement by the lateral stiffeners, the interlocking action of the various penetrating stiffeners significantly improves the lateral stability and seismic resistance of the arch bridge.

[0014] As a further aspect of the present invention: an adhesive is filled between the penetrating reinforcement and the lateral reinforcement and the inner wall of the arch bridge. When installing the penetrating reinforcement and the lateral reinforcement, a pre-drilled hole needs to be made in the arch bridge wall, and the diameter of the pre-drilled hole needs to be larger than the outer diameter of the penetrating reinforcement and the lateral reinforcement to avoid being blocked by the inner wall of the arch bridge and to ensure that the penetrating reinforcement and the lateral reinforcement can be smoothly installed.

[0015] After the penetrating and lateral reinforcements are installed, gaps remain between them and the inner wall of the arch bridge, hindering force transmission and making them susceptible to corrosion. Therefore, adhesive must be filled into these gaps. The adhesive serves to connect the penetrating and lateral reinforcements to the inner wall of the arch bridge, facilitating and evenly distributing forces, and preventing excessive localized forces that could damage the components. Furthermore, the adhesive fills the gaps, preventing external air from entering and corroding the penetrating and lateral reinforcements.

[0016] As a further aspect of the present invention: the adhesive is epoxy resin mortar. Epoxy resin mortar is a high-viscosity mortar with strong adhesion and a wide range of applications, exhibiting strong bonding force between concrete and metal. The cured epoxy resin mortar has high strength, effectively transmitting force. It also possesses stable chemical properties, good corrosion resistance, and good weather resistance. Furthermore, epoxy resin mortar has good flexibility and impact resistance, resisting deformation caused by external forces and enhancing the seismic resistance of reinforced structures.

[0017] As a further aspect of the present invention, the suspension mechanism is either a cable-stayed type or a cable-stayed type. A cable-stayed type is suitable for arch bridges with relatively small spans and is relatively simple to construct. A cable-stayed type is suitable for arch bridges with relatively large spans, but is relatively complex to construct.

[0018] As a further aspect of the invention: the spacing between two adjacent penetrating reinforcement members along the arch axis of the arc-shaped member is 50cm to 80cm, and the spacing between two adjacent penetrating reinforcement members along the width of the arch bridge is 40cm to 60cm. The more penetrating reinforcement members installed within the arch bridge, the greater the overall density and the better the reinforcement effect. However, too many penetrating reinforcement members can damage the original structure of the arch bridge, having a counterproductive effect on its overall strength and stability. Furthermore, too many penetrating reinforcement members significantly increase the construction process. Therefore, the adjacent distance between penetrating reinforcement members needs to be controlled within a certain range to achieve the optimal reinforcement effect.

[0019] In another aspect, the present invention provides a construction method for a reinforcement structure of an arch bridge span, specifically including the following steps:

[0020] S1. Select at least four control points at the arch bridge base as reference points for setting the base of the arch reinforcement, and select at least four control points at the foundation around the arch bridge as reference points for setting the base of the support.

[0021] S2. Based on the relative positional relationship of the benchmark points and the design values ​​of each component of the reinforced structure, establish a three-dimensional coordinate model of the reinforced structure to confirm the penetration position and penetration angle of each anchor cable on the arch bridge.

[0022] S3. Based on the penetration position and penetration angle of the anchor cable, penetrating reinforcement and lateral reinforcement, drill holes in the arch bridge and drill holes in the lateral reinforcement to reserve hole positions.

[0023] S4. Insert the lateral reinforcement through the lateral hole of the arch bridge, insert the penetrating reinforcement through the inner arch hole of the arch bridge and the reserved hole of the lateral reinforcement in sequence, and fix the arch-shaped reinforcement to the inner arch of the arch bridge.

[0024] S5. Fill the gap between the penetrating reinforcement and the lateral reinforcement and the inner wall of the arch bridge with adhesive.

[0025] As a further aspect of the present invention: in step S3, the diameter of each borehole in the arch bridge is 4mm to 6mm larger than the outer diameter of the penetrating reinforcement and the lateral reinforcement. This thickness facilitates grouting of the gaps by the grouting equipment; if the gaps are too small, the grouting equipment cannot reach them. When the thickness of the epoxy resin mortar is between 4mm and 6mm, it has good strength and seismic resistance. However, if the epoxy resin mortar is too thick, it will weaken the longitudinal shear resistance between the penetrating reinforcement and the lateral reinforcement and the inner wall of the arch bridge.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] Arch-shaped reinforcements serve as supports for the inner arch of the arch bridge, and their supporting effect is enhanced through a suspension cable mechanism, thereby increasing the overall load-bearing capacity of the arch bridge. Penetrating reinforcements run through the arch bridge and are installed inside, acting as the internal skeleton and providing restraint to various parts of the arch bridge. By integrating the arch-shaped and penetrating reinforcements into a unified whole, the overall seismic resistance of the arch bridge is improved. The reinforced structure is unaffected by the arch bridge's shape, and its strengthening effect is particularly significant for long-span arch bridges. Attached Figure Description

[0028] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the assembly of a reinforcement structure for an arch bridge span;

[0030] Figure 2 This is a schematic diagram of the overall structure of a reinforced structure for an arch bridge span;

[0031] Figure 3 This is an assembly diagram of embodiment 2 of a reinforced structure for an arch bridge span.

[0032] In the diagram: 1. Arched reinforcement; 11. Arc-shaped rod; 12. Reinforcing rib; 2. Penetrating reinforcement; 3. Suspension mechanism; 31. Support seat; 32. Anchor cable; 4. Lateral reinforcement. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0035] Please see Figure 1-3 As shown in the embodiment of the present invention, a reinforcing structure for an arch bridge span includes an arch-shaped reinforcing member 1 that fits into the inner arch of the arch bridge and a suspension cable mechanism 3. The two ends of the arch-shaped reinforcing member 1 abut against the bases at both ends of the arch bridge. Several penetrating reinforcing members 2 are provided on one side of the surface of the arch-shaped reinforcing member 1 that fits into the inner arch of the arch bridge, and the penetrating reinforcing members 2 penetrate the interior of the arch bridge. The suspension cable mechanism 3 includes support seats 31 located at four opposite corners of the arch bridge and several anchor cables 32. One end of each anchor cable 32 is anchored to a corresponding support seat 31, and the other end of each anchor cable 32 passes through a corresponding penetrating reinforcing member 2 and is anchored to the arch-shaped reinforcing member 1.

[0036] When an arch bridge requires reinforcement, arch-shaped reinforcement 1 is installed in the inner arch of the arch bridge as its outer skeleton, while penetrating reinforcement 2 is installed inside the arch bridge as its inner skeleton, thereby strengthening the overall connection of the arch bridge. This is especially true for masonry arch bridges, which are composed entirely of blocks with relatively weak connections and poor overall seismic resistance. The penetrating reinforcement 2 enhances the connection between the blocks and provides restraint to each block, significantly improving the lateral stability of the arch bridge.

[0037] One end of the anchor cable 32 is anchored to the foundation, and the other end passes around the support seat 31 and is anchored to the arch reinforcement 1. The support seat 31 changes the direction of force transmission of the anchor cable 32, and the foundation bears the tension of the anchor cable 32. The tension of the anchor cables 32 on both sides of the support seat 31 is supported by the support seat 31. The function of the support seat 31 and the anchor cable 32 is to convert part of the pressure borne by the arch bridge foundation into the pressure of the support seat 31, thereby reducing the strength borne by the arch bridge.

[0038] In another aspect, the present invention provides a construction method for a reinforcement structure of an arch bridge span, specifically including the following steps:

[0039] S1. Select at least four control points at the arch bridge base as reference points for setting the base of the arch reinforcement 1, and select at least four control points at the foundation around the arch bridge as reference points for setting the base of the support 31. Since the arch bridge may experience various interference factors such as deformation during long-term use, the original design model and position parameters are no longer usable. In order to ensure the installation accuracy of each component of the reinforcement structure, it is necessary to accurately obtain the position of each installation point.

[0040] The purpose of selecting control points and setting reference points is to simplify the acquisition of installation points for each component by establishing a new three-dimensional coordinate system instead of using the original arch bridge design model and location parameters.

[0041] S2. Based on the relative positions of the reference points and the design values ​​of each component of the reinforced structure, a three-dimensional coordinate model of the reinforced structure is established to confirm the penetration position and angle of each anchor cable 32 on the arch bridge. Except for the arch-shaped reinforcing member 1, which needs to be adapted to the inner arch of the arch bridge, the positions of the other structures can be determined based on the newly established three-dimensional coordinate model. If installed directly on the arch bridge, the penetration position and angle of the anchor cable 32 are the most difficult to confirm due to the influence of the tilt angle, and the penetration reinforcing member 2, which is matched with the anchor cable 32, is also difficult to confirm. Therefore, to improve the penetration accuracy of the reserved holes, the three-dimensional coordinate model of the reinforced structure can accurately find the drilling position and drilling angle of each reserved hole, avoiding construction using visual estimation or experience.

[0042] S3. Based on the penetration positions and angles of anchor cable 32, penetrating reinforcement 2, and lateral reinforcement 4, holes are drilled in the arch bridge, and holes are also drilled in the lateral reinforcement 4 to reserve hole positions. The diameter of each hole drilled in the arch bridge is 4mm to 6mm larger than the outer diameter of penetrating reinforcement 2 and lateral reinforcement 4 to facilitate the passage of each component and prevent jamming on the inner wall.

[0043] S4. Insert the lateral reinforcement 4 through the lateral borehole of the arch bridge, and insert the penetrating reinforcement 2 through the borehole in the inner arch of the arch bridge and the pre-drilled hole of the lateral reinforcement 4 in sequence. Secure the arch-shaped reinforcement 1 to the inner arch of the arch bridge. After inserting the lateral reinforcement 4, adjust the position of the pre-drilled hole on the lateral reinforcement 4 so that the penetrating reinforcement 2 can be inserted into the pre-drilled hole of the lateral reinforcement 4, thereby fixing the lateral reinforcement 4 and the penetrating reinforcement 2.

[0044] S5. An adhesive is filled between the penetrating reinforcement 2 and the lateral reinforcement 4 and the inner wall of the arch bridge. After the adhesive is cured, it has a certain strength and can play the role of transmitting force and sealing gaps.

[0045] Example 1

[0046] Please see Figure 1As shown, the cable-stayed mechanism 3 is a cable-stayed type, with multiple anchor cables 32 extending from the support seats 31 at both ends to support the arch-shaped reinforcing member 1 in a cable-stayed manner. The penetrating reinforcing members 2 that pass through the anchor cables 32 need to be adapted to the penetration angle of the anchor cables 32, maintaining a certain drilling angle during drilling construction. The penetration angles of the remaining penetrating reinforcing members 2 can be adapted according to the arch axis of the arch bridge. Since the larger the angle between the cable 32 and the support seat 31 of the cable-stayed type, the greater the force it can withstand, the cable-stayed reinforcing structure is suitable for arch bridges with small spans.

[0047] Example 2

[0048] Please see Figure 3 As shown, the suspension mechanism 3 is a cable-stayed type, with a suspension cable connecting the two end support seats 31. Multiple anchor cables 32 are anchored on the suspension cable, and the anchor cables 32 vertically support the arch-shaped reinforcing member 1. Penetrating reinforcing members 2, passing through the anchor cables 32, penetrate the arch bridge vertically. The penetration angle of the remaining penetrating reinforcing members 2 can be adapted according to the arch axis of the arch bridge. Since the length of the suspension cable can be adjusted according to the span of the arch bridge, there is no restriction on the angle of the anchor cables 32. Therefore, the suspension-type reinforcing structure is suitable for arch bridges with large spans.

[0049] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A reinforcing structure for an arch bridge span, characterized in that, include: An arch-shaped reinforcing member (1) is attached to the inner arch of the arch bridge. The two ends of the arch-shaped reinforcing member (1) abut against the bases at both ends of the arch bridge. A plurality of penetrating reinforcing members (2) are provided on one side of the contact surface between the arch-shaped reinforcing member (1) and the inner arch of the arch bridge. The penetrating reinforcing members (2) penetrate through the interior of the arch bridge. The arch-shaped reinforcing member (1) includes a plurality of arc-shaped rods (11) arranged along the width direction of the inner arch of the arch bridge and a plurality of reinforcing ribs (12) arranged between the plurality of arc-shaped rods (11). The suspension cable mechanism (3) includes support seats (31) set at the four opposite corners of the arch bridge and several anchor cables (32). One end of the anchor cable (32) is anchored to the corresponding support seat (31), and the other end of the anchor cable (32) passes through the corresponding penetrating reinforcement (2) and is anchored to the corresponding arc-shaped rod (11). An adhesive is filled between the penetrating reinforcement (2) and the inner wall of the arch bridge.

2. The reinforcing structure for an arch bridge span according to claim 1, characterized in that, It also includes several lateral reinforcements (4), which penetrate the interior of the arch bridge along the side of the arch bridge, and the end of the penetrating reinforcement (2) away from the arch reinforcement (1) penetrates the corresponding lateral reinforcement (4).

3. The reinforcing structure for an arch bridge span according to claim 2, characterized in that, The lateral reinforcement (4) is filled with adhesive between itself and the inner wall of the arch bridge.

4. The reinforcing structure for an arch bridge span according to claim 3, characterized in that, The adhesive is epoxy resin mortar.

5. A reinforcing structure for an arch bridge span according to any one of claims 1 to 4, characterized in that, The sling mechanism (3) is either a cable-stayed or suspension cable type.

6. A reinforcing structure for an arch bridge span according to any one of claims 1 to 4, characterized in that, The distance between two adjacent penetrating reinforcement members (2) along the arch axis of the arc-shaped member (11) is 50cm to 80cm, and the distance between two adjacent penetrating reinforcement members (2) along the width of the arch bridge is 40cm to 60cm.

7. The construction method for the reinforced structure according to claim 4, characterized in that, Includes the following steps: S1. Select at least four control points at the arch bridge base as the base setting reference points for the arch reinforcement (1), and select at least four control points at the foundation around the arch bridge as the base setting reference points for the support seat (31). S2. Based on the relative positional relationship of the reference points and the design values ​​of each component of the reinforced structure, establish a three-dimensional coordinate model of the reinforced structure to confirm the penetration position and penetration angle of each anchor cable (32) on the arch bridge. S3. Based on the penetration position and penetration angle of the anchor cable (32), the penetrating reinforcement (2) and the lateral reinforcement (4), the arch bridge is drilled, and holes are drilled on the lateral reinforcement (4) to reserve the hole position. S4. Insert the lateral reinforcement (4) through the lateral borehole of the arch bridge, insert the penetrating reinforcement (2) through the inner arch borehole of the arch bridge and the reserved hole of the lateral reinforcement (4) in sequence, and fix the arch reinforcement (1) to the inner arch of the arch bridge. S5. Fill adhesive between the penetrating reinforcement (2) and the lateral reinforcement (4) and the inner wall of the arch bridge.

8. The construction method for the reinforced structure according to claim 7, characterized in that, In step S3, the diameter of each hole drilled in the arch bridge is 4mm to 6mm larger than the outer diameter of the penetrating reinforcement (2) and the lateral reinforcement (4).

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