Anti-overturning reinforcing device for single-column pier bridge and construction method of anti-overturning reinforcing device
By installing reinforcement devices in single-column pier bridges, the steel plates are fixed by anchor bolts and double nuts, the reverse loading of rubber support is achieved, which solves the problem of overturning of single-column pier bridges, simplifies construction, reduces costs and extends the bridge service life.
Patent Information
- Application Number
- CN202411432638.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-01-07
AI Technical Summary
Single-column pier bridges are prone to overturn when they are subjected to large partial loads or wind loads. The traditional reinforcement method is complex in construction, high in cost and has an adverse impact on the main beam structure.
Install a reinforcement device between the steel cover beam and the cast-in-place beam box, and fix the steel plate by anchor bolts and double nuts to achieve reverse loading of the rubber support, avoiding the lifting of the beam body and simplifying the construction process.
It improves the bridge's overturn resistance, reduces disturbances to the main beam structure, reduces construction costs and equipment investment, simplifies construction processes, and extends the service life of the bridge.
Smart Images
Figure CN119266130A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of bridge engineering, and in particular to an anti-overturning reinforcement device for a single-column pier bridge and a construction method thereof. Background Art
[0002] Single-column pier bridges are widely used in traffic engineering, but with the increase in traffic volume and changes in vehicle loads, their anti-overturning stability faces challenges, especially when single-column pier bridges are subject to large eccentric loads or wind loads, which are prone to overturning. Traditional reinforcement methods often use jacks to lift the beam and then install the support. However, this method has many disadvantages, such as the forced displacement of the beam lifting will have an adverse effect on the main beam structure, and the need to use synchronous lifting equipment, complex construction procedures, and high costs.
[0003] Therefore, it is particularly important to develop an anti-overturning reinforcement device for a single-column pier bridge and a construction method thereof, which can not only effectively enhance the anti-overturning capacity of the bridge but also avoid the above-mentioned defects. Summary of the invention
[0004] The present invention mainly aims at the problems of complex construction, high cost and adverse effects on the main structure of the bridge in the prior art, and provides an anti-overturning reinforcement device for a single-column pier bridge and a construction method thereof. By implanting anchor bolts at the bottom of the cast-in-place beam and box beam at the location where the reinforcement device is added and arranging double nuts to fix the steel plate, reverse loading of the newly added rubber bearing is achieved, without the need for jacking of the beam body, and the construction is simple, economical and efficient.
[0005] The purpose of the present invention is mainly achieved through the following solutions: In the first aspect, the present application provides an anti-overturning reinforcement device for a single-column pier bridge, which is installed between a steel cap beam and a cast-in-place beam box. The steel cap beam is installed on the top of the pier body. The reinforcement device is provided with two groups, which are respectively located on both sides of the upper surface of the steel cap beam. Each group of reinforcement devices includes a support lower pad, a rubber support and a support upper pad stone arranged in sequence from bottom to top; the support upper pad stone includes an anchor bolt, a steel plate, a surround and a filler layer, and an anchor bolt is vertically penetrated at the four corners of the steel plate. The upper end of the anchor bolt is fixedly inserted into the bottom of the cast-in-place beam box, and the lower outer wall of the anchor bolt is threadedly connected with a double nut for adjusting the position of the steel plate. The surround is arranged around the bottom of the cast-in-place beam box and the steel plate, and the filler layer is filled in the space surrounded by the bottom of the cast-in-place beam box, the steel plate and the surround.
[0006] Preferably, the upper end of the anchor bolt is inserted into the cast-in-place beam box to a depth of not less than 250 mm.
[0007] Preferably, when the thickness of the filler layer is greater than 80 mm, a layer of steel mesh is centrally arranged in the filler layer.
[0008] Preferably, the bottom of the cast-in-place beam box is roughened.
[0009] Preferably, the rubber bearing is a plate-type rubber bearing or a basin-type rubber bearing, and the upper surface of the bearing lower pad is provided with a limiting groove for placing the bottom of the rubber bearing.
[0010] Preferably, a grouting pipe and an overflow pipe are provided at the lower part and the higher part of the enclosure respectively.
[0011] In a second aspect, the present application provides a construction method for a single-column pier bridge anti-overturning reinforcement device, comprising the following steps: S1. Anchor bolts are implanted at the bottom of the cast-in-place beam and box beam where the reinforcement device is added; S2. Install the steel cap beam with the bearing bottom pad to the corresponding position of the pier body according to the design drawing, and reserve installation space for the rubber bearing and the bearing upper pad stone; S3. Install rubber bearings on the steel cap beam according to the designed bearing positions; S4. Reverse loading of the rubber bearing is achieved by applying a certain value of torque to the double nut to ensure a close fit between the steel plate and the rubber bearing; S5. Install the enclosure around the steel plate and between the bottom of the cast-in-place beam and box girder; S6. Pour self-compacting grouting material to fill the space enclosed by the bottom of the cast-in-place beam and box beam, steel plate and enclosure; S7. Curing of self-compacting grouting material. After curing, the reinforcement device is installed.
[0012] Preferably, step S1 comprises the following steps: 1) Drill holes: according to the design requirements, drill holes at the bottom of the cast-in-place beam and box beam to ensure that the hole diameter and hole depth meet the requirements; 2) Clean the hole, remove the floating dust and dirt in the hole, and keep the hole clean; 3) Insert the medicine tube and accurately insert it into the clean hole; 4) Drill into the anchor bolt and screw it in with an electric drill until the agent flows out; 5) During the gelation and hardening process, keep the electric drill still to allow the agent to fully gel in the hole, then remove the electric drill and wait for the agent to completely harden; 6) Install the steel plate and temporarily fix it to the anchor bolts using double nuts.
[0013] Therefore, compared with the prior art, the present invention has the following advantages: (1) The present invention ensures the horizontality of the steel plate installation and the overall installation quality of the newly added rubber bearing. Through precise anchor bolt implantation and nut control, the steel plate installation can be made more flat, thereby improving the stability and reliability of the entire reinforcement device; (2) The present invention effectively avoids the adverse effects of forced displacement of the beam body by lifting the beam body on the main beam structure. The traditional method of lifting the beam body easily causes damage to the main beam structure, while the present invention does not require lifting the beam body, thus reducing the disturbance to the main beam structure and extending the service life of the bridge; (3) The installation and construction process of the newly added fixing device of the present invention is controllable and the construction process is simple. Each step in the construction process is clear and the operation is relatively simple. It is easy for construction personnel to master and execute, thereby improving construction efficiency; (4) The present invention does not require the use of synchronous jacking equipment, has obvious economic benefits, reduces equipment investment and use costs, reduces the total project cost, and has good economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of installation during construction in the present invention; Figure 2 It is a structural schematic diagram of the present invention.
[0015] Illustration: 1-steel cap beam, 2-cast-in-place beam box, 3-pier body, 4-pad under bearing, 5-rubber bearing, 6-pad stone on bearing, 7-anchor bolt, 8-steel plate, 9-enclosure, 10-filling layer, 11-double nut, 12-limiting groove, 13-grouting pipe, 14-overflow pipe. DETAILED DESCRIPTION
[0016] The following is a specific embodiment, and combined with the attached Figure 1-2 It should be understood that the implementation of the present invention is not limited to the following embodiments, and any form of modification and / or change made to the present invention will fall within the protection scope of the present invention.
[0017] Embodiment 1: like Figure 1 , 2 As shown, the present invention provides a technical solution, a single-column pier bridge anti-overturning reinforcement device, which is installed between a steel cap beam 1 and a cast-in-place beam box 2. The steel cap beam 1 is fixed to the top of the pier body 3 by bolts. The reinforcement device is provided with two groups, which are respectively located on both sides of the upper surface of the steel cap beam 1, and can play a good supporting and anti-overturning effect.
[0018] Specifically, each group of reinforcement devices consists of a support lower pad 4, a rubber support 5 and a support upper pad stone 6 which are arranged in sequence from bottom to top; the support upper pad stone 6 consists of an anchor bolt 7, a steel plate 8, a enclosure 9 and a filler layer 10, and an anchor bolt 7 is vertically penetrated at the four corners of the steel plate 8. The upper end of the anchor bolt 7 is fixedly inserted into the bottom of the cast-in-place beam box 2, and the lower outer wall of the anchor bolt 7 is threadedly connected with a double nut 11 for adjusting the position of the steel plate 8. The enclosure 9 is arranged around the bottom of the cast-in-place beam box 2 and the steel plate 8, and the filler layer 10 is filled in the space surrounded by the bottom of the cast-in-place beam box 2, the steel plate 8 and the enclosure 9.
[0019] By implanting anchor bolts 7 at the bottom of the beam at the reinforcement device and arranging double nuts 11 to fix the steel plate 8, reverse loading and precise force control of the rubber bearing 5 are achieved without lifting the beam body, and the construction is simple, economical and efficient.
[0020] Embodiment 2: like Figure 1 , 2 As shown, the present invention provides another technical solution, a single-column pier bridge anti-overturning reinforcement device, which is different from Example 1 in that the upper end of the anchor bolt 7 is inserted into the cast-in-place beam box 2 to a depth of not less than 250 mm, and the anchor bolt 7 is inserted into the cast-in-place beam box to a depth of not less than 250 mm, so that the bonding area between the anchor bolt 7 and the cast-in-place beam box 2 is also increased, which helps to improve the bonding strength between the anchor bolt 7 and the cast-in-place beam box 2, thereby enhancing the overall connection effect, and can more effectively resist external forces to ensure the stability and safety of the connection parts.
[0021] Embodiment 3: like Figure 1 , 2As shown, the present invention provides another technical solution, a single-column pier bridge anti-overturning reinforcement device, which is different from Example 1 in that when the thickness of the packing layer 10 is greater than 80mm, a layer of steel mesh is centrally arranged in the packing layer 10, and the steel mesh can enhance the structural strength and stability of the packing layer and prevent cracking and deformation; first, the size of the steel mesh is determined according to the specific size and design requirements of the reinforcement device. The size of the steel mesh should be able to be placed in the center of the space defined by the template, and a certain gap should be reserved for its side length or diameter. In this embodiment, the steel mesh adopts 10@80x80 steel mesh, and the concrete protection thickness of the side of the steel mesh is 25mm-35mm to ensure that the grouting material can fully wrap the steel mesh. According to the determined size and specifications, the steel bars are made into a mesh structure by welding or binding. If the thickness of the filler layer 10 is greater than 80 mm, before installing the enclosure, a steel mesh needs to be placed, and some tools are used to ensure that it is centered. A temporary positioning bracket or hook can be used to hang the steel mesh in the center of the enclosed space. For example, some small hooks can be pre-installed on the inner wall of the bottom of the beam, and several key nodes of the steel mesh are connected to the hooks by ropes or wires. The length of the connection is adjusted to make the steel mesh centered in the horizontal direction. At the same time, the position can be further accurately adjusted by measuring the distance from the steel mesh to each edge to ensure that the steel mesh is also in the center in the vertical direction. After the steel mesh is placed in the center, its position needs to be fixed to prevent the steel mesh from shifting during the pouring of the grouting material. Some simple fixing measures can be adopted, such as setting some small support blocks between the steel mesh and the steel plate and the bottom of the beam. These support blocks can be made of wood or plastic to avoid chemical reactions with the grouting material. The height of the support block should be determined according to the design position of the steel mesh, so that the steel mesh is kept at a suitable distance from the bottom and top of the template to ensure that the grouting material can evenly wrap the steel mesh. The above only provides a method for placing a steel mesh, but is not limited to the above method, as long as the steel mesh can be placed in the center.
[0022] Embodiment 4: like Figure 1 , 2 As shown, the present invention provides another technical solution, a single-column pier bridge anti-overturning reinforcement device, which is different from Example 1 in that the bottom of the cast-in-place beam box 2 is roughened, and roughening the bottom of the beam can effectively increase the bonding force between the bottom of the beam and the grouting material. In the case of no roughening, the surface of the bottom of the beam is relatively smooth, and the bonding of the grouting material to it mainly depends on its own gelling properties. After roughening, many uneven surfaces will be formed on the bottom of the beam, and the grouting material can better fill these uneven parts during the pouring process, just like being embedded in the bottom of the beam. When the grouting material hardens, these embedded parts can greatly enhance the mechanical bite force between the bottom of the beam and the grouting material, thereby improving the bonding strength between the two and ensuring that the reinforcement device and the beam body work better together.
[0023] Embodiment 5: like Figure 1 , 2 As shown, the present invention provides another technical solution, a single-column pier bridge anti-overturning reinforcement device, which is different from Example 1 in that the rubber bearing 5 adopts a plate-type rubber bearing 5 or a basin-type rubber bearing 5, and the upper surface of the bearing lower pad 4 is provided with a limiting groove 12 for placing the bottom of the rubber bearing 5, and the bottom of the rubber bearing 5 is bonded in the limiting groove 12 by glue.
[0024] The present invention also provides a construction method for a single-column pier bridge anti-overturning reinforcement device, comprising the following steps: S1, roughen the corresponding bottom of the cast-in-place beam box 2, and implant anchor bolts 7 at the bottom of the cast-in-place beam box 2 where the reinforcement device is added. The anchor bolts 7 are made of Q355 grade stainless steel; S2. Install the steel cap beam 1 with the bearing bottom pad 4 to the corresponding position of the pier body 3 according to the design drawing. Ensure the installation accuracy by measuring instruments, and reserve installation space for the rubber bearing 5 and the bearing upper pad 6. The bearing bottom pad 4 is made of stainless steel and is fixedly connected to the steel cap beam 1 by bolts. S3. Install the rubber bearing 5 on the steel cap beam 1 according to the design position of the bearing. During installation, strictly follow the design requirements to ensure that the direction of the rubber bearing 5 is correct and the position deviation is controlled within the allowable deviation range; S4. Reverse loading of the rubber bearing 5 is achieved by applying a certain value of torque to the double nut 11 to ensure close fit between the steel plate 8 and the rubber bearing 5. Specifically, a torque wrench is used to apply a specific value of torque to the double nut 11 to achieve reverse loading of the rubber bearing 5 so that the stress state of the rubber bearing 5 meets the design requirements. After testing, the steel plate 8 and the rubber bearing 5 are in good close fit. S5. Weld the enclosure 9 around the steel plate 8 and the bottom of the cast-in-place beam box 2. The enclosure 9 is made of Q355 grade stainless steel and is firmly installed. The joint gaps between the enclosures 9 and the enclosures 9, between the enclosures 9 and the steel plate 8, and between the enclosures 9 and the bottom of the beam are sealed with sealant to prevent leakage of grouting material; S6, pouring self-compacting grouting material to fill the space enclosed by the bottom of the cast-in-place beam box 2, the steel plate 8 and the enclosure 9, pouring self-compacting grouting material into the enclosed space through the grouting pipe 13, and the self-compacting grouting material adopts self-compacting concrete with a strength not less than C60; S7. Curing of self-compacting grouting materials, maintaining appropriate ambient temperature and humidity during the curing period. After the curing is completed, it is tested that the installation of the reinforcement device meets the design requirements, the anti-overturning reinforcement effect of the bridge is good, and the reinforcement device installation is completed.
[0025] Specifically, the above step S1 includes the following steps: 1) Drilling: according to the design requirements, drill holes at the bottom of the cast-in-place beam box 2. The drilling spacing and margins are strictly implemented according to the requirements of the drawings to ensure that the hole diameter and hole depth meet the requirements; 2) Clean the hole, use air pressure blowpipe and other tools to remove the floating dust and dust in the hole to keep the hole clean; 3) Place the chemical tube and accurately insert it into the clean hole to provide chemical adhesive for the anchor bolt; 4) Drill into the anchor bolt 7 and screw it in with an electric drill until the agent flows out. During the screwing process, pay attention to controlling the speed and force to ensure that the anchor bolt 7 enters the hole smoothly and the agent is evenly distributed; 5) During the gelation and hardening process, keep the electric drill still to allow the agent to fully gel in the hole to form a preliminary bonding strength, then remove the electric drill and wait for the agent to completely harden; 6) Install the steel plate 8 and temporarily fix the steel plate 8 to the anchor bolts 7 through the double nuts 11 and washers. At this time, the anchor bolts 7 have preliminarily fixed the steel plate 8, but further adjustment and reinforcement are required later.
[0026] The present invention provides an anti-overturning reinforcement device for a single-column pier bridge and a construction method thereof, which ensure the horizontality of the steel plate installation and the overall installation quality of the newly added rubber bearings. Through the precise implantation of anchor bolts and the control of nuts, the steel plate installation can be made more flat, thereby improving the stability and reliability of the entire reinforcement device; effectively avoiding the adverse effects of the forced displacement of the beam body by jacking up on the main beam structure. The traditional method of jacking up the beam body is prone to damage to the main beam structure, while the present invention does not require jacking up the beam body, thereby reducing the disturbance to the main beam structure and extending the service life of the bridge; the installation and construction process of the newly added reinforcement device is controllable and the construction process is simple, the various steps in the construction process are clear, the operation is relatively simple, and it is easy for construction personnel to master and execute, thereby improving construction efficiency; there is no need to use synchronous jacking equipment, the economic benefit advantage is obvious, the equipment investment and use cost are reduced, the total project cost is reduced, and it has good economic and social benefits.
[0027] It should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the appended claims of the application.
Claims
1. A single-column pier bridge anti-overturning reinforcement device, installed between a steel cap beam (1) and a cast-in-place beam box (2), wherein the steel cap beam (1) is installed on the top of the pier body (3), characterized in that: The reinforcement device is provided with two groups, which are respectively located on both sides of the upper surface of the steel cap beam (1), each group of the reinforcement device comprises a support lower pad (4), a rubber support (5) and a support upper pad stone (6) which are arranged in sequence from bottom to top; the support upper pad stone (6) comprises an anchor bolt (7), a steel plate (8), a surrounding plate (9) and a filling layer (10), and an anchor bolt (7) is vertically penetrated at each of the four corners of the steel plate (8), the upper end of the anchor bolt (7) is fixedly inserted into the bottom of the cast-in-place beam box (2), and the lower outer wall of the anchor bolt (7) is threadedly connected with a double nut (11) for adjusting the position of the steel plate (8), the surrounding plate (9) is arranged around the bottom of the cast-in-place beam box (2) and the steel plate (8), and the filling layer (10) is filled in the space surrounded by the bottom of the cast-in-place beam box (2), the steel plate (8) and the surrounding plate (9).
2. The anti-overturning reinforcement device for a single-column pier bridge according to claim 1 is characterized in that: The upper end of the anchor bolt (7) is inserted into the cast-in-place beam box (2) to a depth of not less than 250 mm.
3. The anti-overturning reinforcement device for a single-column pier bridge according to claim 1 is characterized in that: When the thickness of the filler layer (10) is greater than 80 mm, a layer of steel mesh is centrally arranged in the filler layer (10).
4. The anti-overturning reinforcement device for a single-column pier bridge according to claim 1 is characterized in that: The bottom of the cast-in-place beam box (2) is roughened.
5. The anti-overturning reinforcement device for a single-column pier bridge according to claim 1 is characterized in that: The rubber bearing (5) is a plate-type rubber bearing (5) or a basin-type rubber bearing (5), and a limiting groove (12) for placing the bottom of the rubber bearing (5) is provided on the upper surface of the bearing lower pad (4).
6. The anti-overturning reinforcement device for a single-column pier bridge according to claim 1 is characterized in that: A grouting pipe (13) and a grouting pipe (14) are respectively provided at the lower part and the upper part of the enclosure plate (9).
7. A construction method for the anti-overturning reinforcement device for a single-column pier bridge according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, implanting anchor bolts (7) at the bottom of the cast-in-place beam box (2) where the reinforcement device is added; S2. Install the steel cap beam (1) including the bearing lower pad (4) to the corresponding position of the pier body (3) according to the design drawing, and reserve installation space for the rubber bearing (5) and the bearing upper pad stone (6); S3. Installing a rubber bearing (5) on the steel cap beam (1) according to the designed bearing position; S4, applying a certain value of torque to the double nut (11) to achieve reverse loading on the rubber bearing (5), thereby ensuring a tight fit between the steel plate (8) and the rubber bearing (5); S5, installing a panel (9) around the steel plate (8) and between the bottom of the cast-in-place beam box (2); S6, pouring self-compacting grouting material to fill the space enclosed by the bottom of the cast-in-place beam box (2), the steel plate (8) and the enclosure (9); S7. Curing of self-compacting grouting material. After curing, the reinforcement device is installed.
8. The construction method of the anti-overturning reinforcement device for a single-column pier bridge according to claim 7 is characterized in that: The step S1 comprises the following steps: 1) Drill holes. According to the design requirements, drill holes at the bottom of the cast-in-place beam box (2) to ensure that the hole diameter and hole depth meet the requirements; 2) Clean the hole, remove the floating dust and dirt in the hole, and keep the hole clean; 3) Insert the medicine tube and accurately insert it into the clean hole; 4) Drill into the anchor bolt (7) and screw it in with an electric drill until the agent flows out; 5) During the gelation and hardening process, keep the electric drill still to allow the agent to fully gel in the hole, then remove the electric drill and wait for the agent to completely harden; 6) Install the steel plate (8) and temporarily fix the steel plate (8) to the anchor bolts (7) using the double nuts (11).