Anti-falling and anti-overturning reinforcing device and method for in-service bridge

Abstract

The application discloses a reinforcing device and method for preventing beam falling and overturning of a bridge in service, and relates to the fields of bridge construction and reinforcing and repairing of bridges in service. The reinforcing device is used for reinforcing a bridge, the bridge comprising a beam body, a bent cap abutment and a pier, and comprising reinforcing anchor rods for being simultaneously embedded into the beam body, the bent cap abutment and the pier, and anchor rod anchoring assemblies for locking the reinforcing anchor rods from two end portions of the reinforcing anchor rods to form pre-tension of the reinforcing anchor rods. Compared with common reinforcing devices for preventing beam falling and overturning, the pre-pressures applied by the device can be adjusted according to the conditions of the bridge, the original structure stress system under normal use conditions is not changed, and the device has the remarkable engineering advantages of additional limitation of beam body lateral bridge direction rigid body translation sliding under large deformation conditions. The application solves the safety hidden trouble problem of existing bridge engineering, prevents the beam body of a single-column pier beam bridge from overturning, saves manpower and financial resources, and creates value for the country and the society.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge reinforcement, in particular to a reinforcement device and method for preventing beam falling and overturning of a bridge in service. BACKGROUND

[0002] Single-column support system continuous beam bridges are widely used in the design of urban overpasses and highway overpasses, ramp bridges, etc. due to their great advantages in terms of design ideal perspective, engineering cost, and under-bridge clearance height. However, since 2007, this type of bridge has been continuously subjected to extreme eccentric loading, resulting in bending and torsional deformation, support voiding, permanent deformation, and even beam body sliding and overall bridge collapse, causing significant personal and property damage. In February 2021, the Ministry of Transport, the competent department, issued the Technical Requirements for Highway Dangerous Old Bridge Inspection and Reconstruction, requiring all bridges in service to conduct self-inspection and self-checking, and to conduct safety reconstruction on single-column pier bridges with safety hazards.

[0003] When a bridge is subjected to an earthquake, the unreliability of the connection between the bridge beam and the lower pier column and the poor overall performance in this case can cause lateral displacement of the beam, leading to beam falling and overall bridge collapse. In order to protect economic development, personal and property safety, improve the seismic resistance of bridges in the earthquake zone, prevent beam falling, ensure that bridges in the earthquake zone are not damaged in a certain intensity earthquake, and ensure smooth traffic after the earthquake, it is particularly important and urgent to improve the seismic resistance of bridges in the earthquake zone.

[0004] Currently, the existing seismic prevention and beam falling and overturning reinforcement technology for bridges in service commonly uses methods such as adding multiple supports, adding steel cover beams or pile foundations, and replacing with tension-compression bearings. The method of adding multiple supports, cover beams, or pile foundations changes the original stress support system of the main beam and cover beam, which can easily cause secondary damage due to reinforcement, and in practical applications, it requires many difficult steps such as anchoring, pouring concrete, and jacking the main beam, which makes it difficult to ensure construction quality, easily causes engineering quality problems, and does not achieve the expected reinforcement effect. In addition, it needs to interrupt traffic, has a high cost, and has a long construction period. Replacing tension-compression bearings still has limited effect on improving the overturning resistance of single-support single-column pier bridges, and the main beam needs to be jacked to replace the new support, which may cause permanent damage to the beam. The method of adding steel cover beams requires the use of large engineering machinery vehicles during installation, which severely hinders traffic, and the steel cover beams have a large self-weight, which can cause additional load on the pier due to the shear force of the steel hoop and the bending moment at the pile bottom, weakening the traffic safety and the overall safety of the bridge. The above reinforcement technologies do not consider the permanent damage to the supports and cover beams during the process of limiting the lateral translation and sliding of the bridge beam, and cannot prevent the occurrence of the above phenomena and disasters. SUMMARY

[0005] Therefore, the application provides a reinforcing device and method for preventing beam falling and overturning of a bridge in service, provides pre-pressure to cope with the support void phenomenon caused by eccentric load, provides overturning moment to solve the engineering problems of large deformation in the transverse direction of the bridge and overturning through the force transmission system of the anchor rod bearing tension.

[0006] In the first aspect, the application provides a reinforcing device for preventing beam falling and overturning of a bridge in service, which is used to reinforce the bridge, the bridge comprising a beam body, a bent cap abutment and a pier, the reinforcing device comprising a reinforcing anchor rod for being simultaneously embedded in the beam body, the bent cap abutment and the pier, and an anchor rod anchoring assembly for locking the reinforcing anchor rod at both ends of the reinforcing anchor rod to form a pre-tension of the reinforcing anchor rod.

[0007] Optionally, the reinforcing anchor rod comprises a threaded steel bar and a nested steel pipe tightly sleeved on the outer periphery of the threaded steel bar.

[0008] Optionally, the nested steel pipe comprises an upper nested steel pipe and a lower nested steel pipe, a pipe side wall of the upper nested steel pipe is threadedly sleeved on the outer periphery of the lower nested steel pipe, and a pipe end wall of the upper nested steel pipe is screwed on the threaded steel bar.

[0009] Optionally, an end edge of the upper nested steel pipe is provided with a sealing ring, and an end edge of the lower nested steel pipe is provided with a gasket.

[0010] Optionally, the anchor rod anchoring assembly comprises a rod end fixing bolt and a spiral steel bar, and the rod end fixing bolt is used to be screwed on the reinforcing anchor rod.

[0011] In the second aspect, the application provides a method for reinforcing a bridge in service, comprising:

[0012] Drilling holes in the beam body, the bent cap abutment and the pier;

[0013] Installing an anchor rod anchoring assembly at the lower end of the reinforcing anchor rod;

[0014] Passing the reinforcing anchor rod with the anchor rod anchoring assembly installed at the lower end into the drilled hole, and installing an anchor rod anchoring assembly at the upper end of the reinforcing anchor rod;

[0015] Applying locking force to the anchor rod anchoring assembly at the upper end of the reinforcing anchor rod to form pre-tension of the reinforcing anchor rod.

[0016] Optionally, after the locking force is applied, the method further comprises completely grouting the drilled hole.

[0017] The technical scheme is small in required installation space, is suitable for repairing and reinforcing various concrete continuous beam bridges of single-column supporting system in service, can prevent support emptying after installation of the device, improves the torsional capacity of the system, prevents overturning of the beam body, limits horizontal bridge transverse translation and sliding of the beam body under large deformation, and prevents permanent deformation of the support. BRIEF DESCRIPTION OF DRAWINGS

[0018] The technical scheme and other beneficial effects of the present application will be apparent through the following detailed description of specific embodiments of the present application, combined with the accompanying drawings.

[0019] Figure 1 A schematic diagram of installation of the double-support concrete beam bridge at an abutment or a bent cap is provided for the embodiments of the present application.

[0020] Figure 2 A schematic diagram of installation of the single-column single-support concrete beam bridge is provided for the embodiments of the present application.

[0021] Figure 3 A structural schematic diagram of the reinforcing device is provided for the embodiments of the present application.

[0022] Figure 4 A bridge span arrangement diagram of the bridge is provided for the embodiments of the present application.

[0023] Figure 5 A construction drawing (half structure) is provided for the embodiments of the present application.

[0024] In the drawings, the elements are identified as follows:

[0025] 1 - beam body, 2 - reinforcing anchor rod, 3 - anchor rod anchoring assembly, 4 - bent cap abutment, 5 - support, 6 - bridge pier; 7 - non-grouting area; 201 - threaded steel bar, 202 - upper nested steel pipe, 203 - lower nested steel pipe, 204 - positioning nut, 205 - positioning screw, 206 - sealing ring, 207 - washer; 301 - rod end fixing bolt, 302 - spiral steel bar. DETAILED DESCRIPTION

[0026] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0028] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements or the interaction between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0030] The bridge anti-falling beam anti-overturning reinforcing device of the present application is specifically assembled and implemented as follows:

[0031] S1, select the length and diameter of the threaded steel bar 201 (the surface can be galvanized) required for the project, embed the upper nested steel pipe 202 and the lower nested steel pipe 203, the outer diameter of the upper nested steel pipe 202 and the lower nested steel pipe 203 is different by 4mm, the upper nested steel pipe 202 is shorter than the lower nested steel pipe 203 by 1 / 3 (which can be adjusted according to the actual situation of the project), embed the upper nested steel pipe 202 and the lower nested steel pipe 203 and align one end, drill two holes in the aligned part and install two M2 screws to fix it, and assemble the nested steel pipe.

[0032] S2, the aligned end of the upper nested steel pipe 202 is sealed and fixed with a ring-shaped patch, and a positioning nut 204 is welded, a sealing ring 206 such as but not limited to rubber is used at the joint between the upper end of the upper nested steel pipe 202 and the lower nested steel pipe 203, and adhesive glue is used for sealing, the gasket 207 is glued and fixed at the lower end of the lower nested steel pipe 203, the inside of the nested steel pipe is sealed, forming a middle non-grouting area 7 to prevent grouting material from entering this area during grouting.

[0033] S3, the threaded steel bar 201 is screwed with the positioning nut 204 and passes through the gasket 207 to form the main body of the reinforcing device, and the threaded steel bar 201 is not in contact and connected with the lower end of the upper nested steel pipe 202 and the lower nested steel pipe 203 in the non-grouting area. The reinforcing anchor rod 2 is assembled by S1, S2 and S3.

[0034] S4, the threaded steel bar 201 is installed with a rod end fixing bolt 301 and a spiral steel bar 302 for anchoring to form an anchor rod anchoring assembly 3, the length of the spiral steel bar 302 can be adjusted according to the actual situation of the project and the anti-pulling and anti-sliding mechanical properties of the device are ensured, and the entire device is completed.

[0035] For the above reinforcing device, it is worth emphasizing that first, the upper nested steel pipe 202 and the lower nested steel pipe 203 are selected, which are integrated with the beam body 1 and the bent cap abutment 4 through grouting material, and since the non-grouting area 7 is arranged inside the upper nested steel pipe 202 and the lower nested steel pipe 203 and a certain space is left between the steel pipes, when the beam body 1 or the bent cap abutment 4 at the upper part is deformed due to temperature gradient effect, the threaded steel bar 201 can move in the space between the walls of the upper nested steel pipe 202 and the lower nested steel pipe 203 to adapt to the small deformation.

[0036] Secondly, the present application forms a sealing protection for the bare and exposed section of the threaded steel by arranging the mutually nested steel pipes in the middle, which greatly improves the durability of the device and enables it to function stably and normally during the service period of the bridge.

[0037] The construction method of the in-service bridge anti-falling beam anti-overturning reinforcing device in the foregoing is briefly described as follows: drilling a hole to a suitable depth from above the bridge deck, placing the reinforcing anchor rod 2 and the anchor rod anchoring assembly 3 into the hole, grouting and anchoring the reinforcing anchor rod 2, applying pre-tightening force to the anchor rod after the strength of the grouting material reaches the requirement, finally completely grouting and sealing the hole and restoring the bridge deck pavement to the original state.

[0038] Here, as an actual operation process, the construction method is as follows:

[0039] First process:

[0040] 1. Step: Determine the device installation position;

[0041] Second process:

[0042] 1. Step: Use a professional concrete drilling and coring machine to drill a hole with a required depth and diameter;

[0043] 2. Step: Roughen the hole wall to facilitate the subsequent combination of the grouting material and the beam body;

[0044] Third process:

[0045] 1. Step: Pre-assemble the rod end fixing bolt 301 and the spiral steel bar 302 at the lower part of the reinforcing anchor rod 2 with the reinforcing anchor rod 2;

[0046] 2. Step: Place the reinforcing anchor rod 2 at the predetermined position of the hole, and check whether the installation of the reinforcing anchor rod 2 is continued by drilling a hole in the pier body;

[0047] 3. Step: Seal the hole and grout to a predetermined height;

[0048] Fourth process:

[0049] 1. Step: Install the nested steel pipe and perform sealing treatment;

[0050] 2. Step: Install the upper rod end fixing bolt 301 and the upper spiral steel bar 302, and tighten and tension them with a tool such as a torque wrench to generate a small amount of pre-tension;

[0051] 3. Step: Completely grout the hole; and maintain to the specified strength;

[0052] Fifth process:

[0053] 1. Step: Restore the bridge deck pavement to the original state, and complete the installation of the anti-falling beam anti-overturning device.

[0054] The construction method of the in-service bridge anti-falling beam anti-overturning reinforcing device, and the beam body construction method at the multi-support abutment are as follows:

[0055] First process:

[0056] 1. Step: Determine the installation position of the device;

[0057] Second procedure:

[0058] 1. Step: Use a professional concrete core drill to drill a hole with the required depth and diameter;

[0059] 2. Step: Roughen the hole wall to facilitate the subsequent grouting material and beam body combination;

[0060] Third procedure:

[0061] 1. Step: The lower end of the reinforcing anchor rod 2 is pre-fixed to the lower surface of the bent cap abutment 4;

[0062] 2. Step: The two end spiral steel bars 302 and the nested steel pipe are pre-assembled with the reinforcing anchor rod 2 and the sealing treatment is done;

[0063] 3. Step: The assembled reinforcing anchor rod 2 passes through the hole from above the bridge deck and is connected and fixed to the lower end fixing bolt 301 of the bent cap abutment 4;

[0064] Fourth procedure:

[0065] 1. Step: Install the upper end fixing bolt 301;

[0066] 2. Step: Then completely grout the hole; maintain to the predetermined strength;

[0067] 3. Step: Tighten and tension the lower end fixing bolt 301 by torque wrench to generate a small amount of pre-tension;

[0068] 4. Step: Maintain the grouting material to the specified strength;

[0069] Fifth procedure:

[0070] 1. Step: Restore the bridge deck pavement to the original state, complete the installation of the anti-falling beam anti-overturning device.

[0071] Relying on the Wu-Ma Expressway Xinzhu Interchange G-ramp three-span continuous beam bridge in Hubei Province, the upper structure is a prestressed reinforced concrete beam bridge, the bent cap abutment 4 of the bridge is double support, and the middle span is single pier single support. The single column support system in-service bridge anti-falling beam anti-overturning reinforcement device is applied to the reinforcement and repair engineering of the bridge, and the construction process is as follows:

[0072] First procedure:

[0073] 1. Step: According to the design drawing, construction drawing and sonar detection, determine the position of the steel bar in the beam body, select the installation position of the device, and the specific positioning size is as shown in Figure 4 ;

[0074] Second procedure:

[0075] 1. Step: Using a professional concrete core drill to drill a hole with a depth of 300 cm and a diameter of 6 cm from the bridge deck to the beam body 1, then through the cap beam abutment 4 to the pier 6. The connection between the beam body 1 and the cap beam abutment 4 is the support 5.

[0076] 2. Roughen the hole wall to facilitate the subsequent grouting material and beam body combination;

[0077] Third procedure:

[0078] 1. Step: Pre-assemble the rod end fixing bolt 301 and the spiral steel bar 302 with the lower end of the threaded steel bar 201;

[0079] 2. Step: Place the threaded steel bar 201 in the hole at a predetermined position 5 cm from the bottom, and make an observation hole with a 3 cm*3 cm hole on the side of the pier 6 and the cap beam abutment 4 to check whether the entire reinforcement anchor rod 2 installation is in place;

[0080] 3. Step: Seal the hole and grout to the predetermined height;

[0081] Fourth procedure:

[0082] 1. Step: Install the upper nested steel pipe 202 and the lower nested steel pipe 203 and seal them well;

[0083] 2. Step: Install the rod end fixing bolt 301 and the upper spiral steel bar 302 at the upper end, tighten and tension with a torque wrench to generate a small amount of pre-tension;

[0084] 3. Step: Completely grout the hole; maintain to the specified strength;

[0085] Fifth procedure:

[0086] 1. Step: Restore the bridge deck pavement to its original state and complete the installation of the anti-falling beam and anti-overturning device.

[0087] In summary, the reinforcement device of the present application has the following advantages compared with existing similar devices:

[0088] A. Specifically, it has the advantages of low price, fast construction, easy installation without the need for large construction machinery, high durability and reliability, no change to the existing bridge stress system, adjustment of pre-pressure setting according to site requirements, no change to the existing bridge appearance and shape, etc. It realizes the design requirements of anti-seismic, anti-falling beam, anti-translation and anti-overturning. It effectively reduces the risk of major disasters of the bridge under the action of earthquake and overloading, ensures the safety of people's life and property, and provides assistance for national infrastructure construction.

[0089] B. The method of installing by drilling holes in the bridge member achieves no change in the appearance of the bridge and does not give people a subjective feeling of visual unreliability.

[0090] The above description is merely the preferred specific embodiments of the present application, and the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, and such changes or replacements should be covered within the protection scope of the present application.

Claims

1. A reinforcement device for preventing falling beams and overturning of an in-service bridge, used for reinforcing a bridge, wherein the bridge comprises a beam body, a cap beam abutment and a pier, and is characterized in that: The cam is secured to the bottom of the frame by a secure coupling between the bridge and the frame, and the cam is secured to the bottom of the frame by a secure coupling between the bridge and the frame.

2. The reinforcement device according to claim 1, characterized in that: The anchor rod anchoring assembly includes a rod end fixing bolt and a spiral steel bar, and the rod end fixing bolt is used to be screwed onto the reinforcement anchor rod.

3. A method for reinforcing an in-service bridge, characterized in that: The reinforcement device according to claim 1 is used to reinforce the in-service bridge, comprising: Drill holes in beams, cap beam abutments, and piers; Installing an anchor rod anchoring assembly at the lower end of the reinforcement anchor rod; Inserting a reinforcement anchor rod with an anchor rod anchoring assembly installed at the lower end into the drill hole, and installing an anchor rod anchoring assembly at the upper end of the reinforcement anchor rod; A locking force is applied to the anchor assembly at the upper end of the reinforcement anchor rod to form a pre-tensioning force on the reinforcement anchor rod.

4. The method for reinforcing an in-service bridge according to claim 3, characterized in that: After applying a locking force to the anchor assembly at the upper end of the reinforcement anchor rod to form a pre-tensioning force on the reinforcement anchor rod, the method further includes completely grouting the drilled hole.

Images