Stone arch bridge reinforcing structure
By using reinforced structures with steel-covered arches and carbon fiber rods on the stone arch bridge, the problem of insufficient durability and safety after load increase of masonry arch bridges is solved, and the bridge bearing capacity and structural stiffness are significantly improved.
Patent Information
- Application Number
- CN202420559323.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-21
AI Technical Summary
After the load is increased, the existing masonry arch bridges have insufficient durability and safety, which are prone to irrecoverable damage caused by overweight vehicles.
The reinforced structure of steel sleeve arches and carbon fiber rods is adopted. The steel sleeve arches are evenly arranged on the bottom edge of the stone arch bridge, and the carbon fiber rod is inserted into the solid abdominal section of the stone arch bridge, and the connection strength of the arch foot is strengthened through the angle steel and the arch foot locking steel plate.
It significantly improves the load-bearing capacity and structural stiffness of the stone arch bridge, enhances the durability and safety of the bridge, and avoids structural damage caused by load lift.
Smart Images
Figure CN222557469U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of bridge engineering reinforcement devices and relates to a stone arch bridge reinforcement structure. Background Art
[0002] With the large-scale road network construction and the development of the logistics industry in the transportation industry, the load level of passing vehicles has been continuously improved, and masonry arch bridges have gradually exposed problems of disease and insufficient bearing capacity, which urgently need to be reinforced. In particular, the passage of overweight vehicles may cause irreversible damage to the bridge, causing the working state of the structure to change during normal use, endangering the durability and safety of the bridge. Utility Model Content
[0003] The utility model aims to provide a stone arch bridge reinforcement structure, which solves the current technical problem of insufficient durability and safety caused by increased load on masonry arch bridges.
[0004] The technical scheme adopted by the utility model is that the stone arch bridge reinforcement structure comprises a plurality of steel sleeve arches and carbon fiber rods; the plurality of steel sleeve arches are evenly arranged on the bottom edge of the stone arch bridge, angle steels are fixedly connected at both ends of the plurality of steel sleeve arches, arch foot locking steel plates are embedded at the arch feet of two adjacent steel sleeve arches, and the arch foot locking steel plates abut against the angle steels; one side of the angle steel is connected with the steel sleeve arch and the arch foot locking steel plates by bolts a, and the other side of the angle steel is connected with the arch foot locking steel plates by bolts b, and the bolts b penetrate the angle steel, and one end of the bolts b penetrates the angle steel and is inserted into the newly added concrete of the arch foot; a plurality of carbon fiber rods are inserted into the solid web section of the stone arch bridge.
[0005] The utility model is also characterized in that:
[0006] The longitudinal section of the steel arch is an I-shaped structure.
[0007] The longitudinal section of the arch foot locking steel plate is an I-shaped structure.
[0008] The longitudinal section of the angle steel is L-shaped.
[0009] Both bolts a and bolt b are chemical bolts.
[0010] The newly added concrete for the arch foot is C30 underwater concrete.
[0011] The beneficial effects of the utility model are:
[0012] The utility model adopts a structural form of steel sleeve arch combined with carbon fiber rods to reinforce the bottom edge and solid web section of the stone arch bridge, and uses angle steel to increase the connection strength between the arch foot locking steel plate and the newly added concrete of the arch foot, thereby solving the current technical problems of insufficient durability and safety caused by the increase in load of masonry arch bridges. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model stone arch bridge reinforcement structure.
[0014] Figure 2 It is a structural schematic diagram of angle steel in the stone arch bridge reinforcement structure of the utility model.
[0015] Figure 3 It is a schematic diagram of the installation of the utility model stone arch bridge reinforcement structure;
[0016] Figure 4 yes Figure 3 main view.
[0017] In the figure, 1. Steel arch sleeve, 2. Angle steel, 3. Arch foot locking steel plate, 4. Bolt a, 5. Carbon fiber rod, 6. Bolt b, 7. New concrete for the arch foot. DETAILED DESCRIPTION
[0018] The utility model is further explained below in conjunction with the accompanying drawings and specific implementation methods.
[0019] Example 1
[0020] like Figure 1-4 As shown, the stone arch bridge reinforcement structure provided by the utility model includes a plurality of steel arch sleeves 1 and carbon fiber rods 5; the plurality of steel arch sleeves 1 are evenly arranged at the bottom edge of the stone arch bridge, and angle steels 2 are fixedly connected at both ends of the plurality of steel arch sleeves 1, and arch foot locking steel plates 3 are embedded at the arch feet of two adjacent steel arch sleeves 1, and the arch foot locking steel plates 3 are abutted against the angle steels 2; one side of the angle steel 2 is connected to the steel arch sleeve 1 and the arch foot locking steel plate 3 by bolts a4, and the other side of the angle steel 2 is connected to the arch foot locking steel plate 3 by bolts b6, and the bolts b6 penetrate the angle steel 2, and one end of the bolts b6 penetrates the angle steel 2 and is inserted into the newly added concrete 7 of the arch foot; the plurality of carbon fiber rods 5 are inserted into the solid section of the stone arch bridge.
[0021] In the present invention, the top of the steel arch 1 is fixed to the bottom edge of the stone arch bridge by an anchor rod, the arch foot locking steel plate 3 is welded to the arch foot of the steel arch 1, and bolt connection holes are reserved on the arch foot locking steel plate 3. The solid section of the stone arch bridge is transversely inserted with a carbon fiber rod 5. The carbon fiber rod 5 is a new type of material, which is made by impregnating a carbon fiber composite material with vinyl resin, curing it at high temperature, and then pouring garnet on the surface. The carbon fiber rod 5 is relatively light, about 1 / 5 of the specific gravity of steel bars, but has high strength. The carbon fiber rod 5 has good corrosion resistance and a long service life. Therefore, in the present invention, the carbon fiber rod 5 is implanted into the solid section of the stone arch bridge, and its position is fixed by an anchor plate. In the process of reinforcing the stone arch bridge with the carbon fiber rod 5, the construction temperature must be controlled, and the minimum must not be lower than 10°C, and the maximum should not exceed 35°C. In order to further increase the adhesion between the carbon fiber rod 5 and the concrete surface layer, garnet can be poured on the surface of the carbon fiber rod 5. In practical applications, the carbon fiber rod is implanted into the solid section of the arch bridge, and is arranged every 1m along the longitudinal direction of the bridge. The two ends are fixed by anchors. The overlap method shall not be used on any cross section. After the carbon fiber rod 5 is fixed, the degree of adhesion shall be checked. The length of the bolt b6 inserted into the newly added concrete 7 of the arch foot is 100mm, and it cooperates with the original arch ring of the stone arch bridge to bear the impact of vehicles together; the utility model is convenient to construct, can significantly improve the bearing capacity of the stone arch bridge, and improve the rigidity of the bridge structure.
[0022] Example 2
[0023] On the basis of Example 1, the longitudinal section of the steel arch 1 is an I-shaped structure.
[0024] In the actual construction process, the steel arch 1 is made of I-shaped Q345 steel, arranged according to the width of the bridge deck, with a horizontal spacing of 50cm. The cross-section of the steel arch 1 is I-shaped, which can be prefabricated in sections and assembled on site. The top of the steel arch 1 is driven into the bottom edge of the stone arch bridge, that is, the inside of the original arch ring, through anchor rods, and the bottom of the steel arch 1 is effectively connected to the newly added concrete 7 of the arch foot through the angle steel 2. To ensure the close fit between the steel arch 1 and the original arch ring, it is necessary to ensure that all bolts are tightened in place during on-site construction, and the gap between the steel arch 1 and the bottom edge of the original arch ring is filled with glue.
[0025] Furthermore, the arch foot locking steel plate 3 has an I-shaped structure in the longitudinal section. In the specific implementation, I-shaped Q345 steel is used and welded in sections at the arch foot of the steel sleeve arch 1.
[0026] Furthermore, the longitudinal section of the angle steel 2 is L-shaped. One side of the angle steel 2 is vertically arranged close to the arch foot of the steel arch sleeve 1, and the other side of the angle steel 2 is parallel to the arch foot locking steel plate 3. Bolt installation holes are reserved in advance on the angle steel 2. By inserting bolts to connect with the steel arch sleeve 1 and the arch foot locking steel plate 3, the connection effect of the steel arch sleeve 1 and the newly added concrete 7 of the arch foot can be improved.
[0027] Furthermore, bolts a4 and b6 are both chemical bolts. Chemical bolts rely on the bond strength and mechanical bite force between concrete to resist pulling out and the bolts themselves to resist shearing. They are mainly used in the connection between new and old structures. Therefore, chemical bolts are used for connection in the utility model. They have the advantages of acid and alkali resistance, low temperature resistance, aging resistance, good heat resistance, no creep at room temperature, and good seismic resistance, which greatly improves safety.
[0028] Example 3
[0029] On the basis of Example 1 and Example 2, the newly added concrete 7 of the arch foot adopts C30 underwater concrete, which has the characteristics of underwater non-separation, self-compactness, low water seepage and slow setting, which further improves the safety.
[0030] The working principle and steps of the utility model are:
[0031] First, re-measure the relevant structural dimensions of the original stone arch bridge to ensure that the dimensions and elevations are correct before cutting and processing. Next, install the arch foot section of the steel arch 1 and weld the arch foot section of the steel arch 1 to the arch foot locking steel plate 3. After welding, install the angle steel 2 and pour the new concrete 7 at the arch foot. Temporarily interrupt the traffic on the bridge deck, use a hydraulic jack to synchronously push the steel arch 1 at the joint of the steel arch 1, and stabilize it for 1 hour after reaching the designed top force. Then tighten the anchor bolts one by one at the gap between the steel arch 1 and the bottom edge of the arch ring, fill the seam with adhesive, and complete the arch installation after the adhesive reaches the curing time. Ensure the close fit between the steel arch 1 and the original arch ring. During on-site construction, it is necessary to ensure that all bolts are tightened in place and the gap between the steel arch 1 and the bottom edge of the arch ring is filled with glue. Next, the carbon fiber rod 5 is installed, the mixture of the concrete surface with peeling, voids, honeycombs and other defects is removed, and the steel bars exposed in the concrete layer are rust-removed; if the original concrete surface is removed in a large area, the defective part is filled with high-strength polymer mortar at the original position. The carbon fiber rod 5 is implanted and anchored on both sides, and the hole is filled with grouting after the anchoring is completed.
Claims
1. The stone arch bridge reinforcement structure is characterized by: The invention comprises a plurality of steel arch sleeves (1) and carbon fiber rods (5); the plurality of steel arch sleeves (1) are evenly arranged at the bottom edge of the stone arch bridge, both ends of the plurality of steel arch sleeves (1) are fixedly connected with angle steels (2), the arch foot locking steel plates (3) are embedded in the arch foot of two adjacent steel arch sleeves (1), and the arch foot locking steel plates (3) are in contact with the angle steels (2); one side of the angle steel (2) is connected to the steel arch sleeve (1) and the arch foot locking steel plates (3) by bolts a (4), and the other side of the angle steel (2) is connected to the arch foot locking steel plates (3) by bolts b (6), and the bolts b (6) penetrate the angle steel (2), and one end of the bolts b (6) penetrates the angle steel (2) and is inserted into the newly added concrete (7) of the arch foot; and the plurality of carbon fiber rods (5) are inserted into the solid web section of the stone arch bridge.
2. The stone arch bridge reinforcement structure according to claim 1, characterized in that: The longitudinal section of the steel arch sleeve (1) is an I-shaped structure.
3. The stone arch bridge reinforcement structure according to claim 1, characterized in that: The arch foot locking steel plate (3) has an I-shaped structure in longitudinal section.
4. The stone arch bridge reinforcement structure according to claim 1, characterized in that: The angle steel (2) has an L-shaped longitudinal section.
5. The stone arch bridge reinforcement structure according to claim 4, characterized in that: The bolts a (4) and the bolts b (6) are both chemical bolts.
6. The stone arch bridge reinforcement structure according to any one of claims 1 to 5, characterized in that: The newly added concrete (7) of the arch foot is C30 underwater concrete.